Mercurial > hg > freeDiameter
annotate include/freeDiameter/libfreeDiameter.h @ 14:14cf6daf716d
Some progress on peers module
| author | Sebastien Decugis <sdecugis@nict.go.jp> |
|---|---|
| date | Thu, 01 Oct 2009 18:24:07 +0900 |
| parents | ef9ef3bf4752 |
| children | 277ec00d793e |
| rev | line source |
|---|---|
| 0 | 1 /********************************************************************************************************* |
| 2 * Software License Agreement (BSD License) * | |
| 3 * Author: Sebastien Decugis <sdecugis@nict.go.jp> * | |
| 4 * * | |
| 5 * Copyright (c) 2009, WIDE Project and NICT * | |
| 6 * All rights reserved. * | |
| 7 * * | |
| 8 * Redistribution and use of this software in source and binary forms, with or without modification, are * | |
| 9 * permitted provided that the following conditions are met: * | |
| 10 * * | |
| 11 * * Redistributions of source code must retain the above * | |
| 12 * copyright notice, this list of conditions and the * | |
| 13 * following disclaimer. * | |
| 14 * * | |
| 15 * * Redistributions in binary form must reproduce the above * | |
| 16 * copyright notice, this list of conditions and the * | |
| 17 * following disclaimer in the documentation and/or other * | |
| 18 * materials provided with the distribution. * | |
| 19 * * | |
| 20 * * Neither the name of the WIDE Project or NICT nor the * | |
| 21 * names of its contributors may be used to endorse or * | |
| 22 * promote products derived from this software without * | |
| 23 * specific prior written permission of WIDE Project and * | |
| 24 * NICT. * | |
| 25 * * | |
| 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED * | |
| 27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * | |
| 28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * | |
| 29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * | |
| 30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * | |
| 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR * | |
| 32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * | |
| 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * | |
| 34 *********************************************************************************************************/ | |
| 35 | |
|
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36 /* This file contains the definitions of functions and types used by the libfreeDiameter library. |
| 0 | 37 * |
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38 * This library is meant to be used by both the freeDiameter daemon and its extensions. |
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39 * It provides the tools to manipulate Diameter messages and related data. |
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40 * This file should always be included as #include <freeDiameter/libfreeDiameter.h> |
| 0 | 41 * |
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42 * The file contains the following parts: |
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43 * DEBUG |
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44 * MACROS |
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45 * THREADS |
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46 * LISTS |
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47 * DICTIONARY |
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48 * SESSIONS |
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49 * MESSAGES |
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50 * DISPATCH |
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51 * QUEUES |
| 0 | 52 */ |
| 53 | |
| 54 #ifndef _LIBFREEDIAMETER_H | |
| 55 #define _LIBFREEDIAMETER_H | |
| 56 | |
| 57 #ifndef FD_IS_CONFIG | |
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58 #error "You must include 'freeDiameter-host.h' before this file." |
| 0 | 59 #endif /* FD_IS_CONFIG */ |
| 60 | |
| 61 #include <pthread.h> | |
| 62 #include <string.h> | |
| 63 #include <assert.h> | |
| 64 #include <errno.h> | |
| 65 #include <arpa/inet.h> | |
| 66 #include <sys/socket.h> | |
| 67 #include <netdb.h> | |
| 68 #include <stdio.h> | |
| 69 #include <stdlib.h> | |
| 70 #include <unistd.h> | |
| 71 | |
| 72 /*============================================================*/ | |
| 73 /* DEBUG */ | |
| 74 /*============================================================*/ | |
| 75 #ifndef ASSERT | |
| 76 #define ASSERT(x) assert(x) | |
| 77 #endif /* ASSERT */ | |
| 78 | |
| 79 /* | |
| 80 * FUNCTION: fd_log_debug | |
| 81 * | |
| 82 * PARAMETERS: | |
| 83 * format : Same format string as in the printf function | |
| 84 * ... : Same list as printf | |
| 85 * | |
| 86 * DESCRIPTION: | |
| 87 * Log internal information for use of developpers only. | |
| 88 * The format and arguments may contain UTF-8 encoded data. The | |
| 89 * output medium (file or console) is expected to support this encoding. | |
| 90 * | |
| 91 * This function assumes that a global mutex called "fd_log_lock" exists | |
| 92 * in the address space of the current process. | |
| 93 * | |
| 94 * RETURN VALUE: | |
| 95 * None. | |
| 96 */ | |
| 97 void fd_log_debug ( char * format, ... ); | |
| 98 extern pthread_mutex_t fd_log_lock; | |
| 99 | |
| 100 /* | |
| 101 * FUNCTION: fd_log_threadname | |
| 102 * | |
| 103 * PARAMETERS: | |
| 104 * name : \0-terminated string containing a name to identify the current thread. | |
| 105 * | |
| 106 * DESCRIPTION: | |
| 107 * Name the current thread, useful for debugging multi-threaded problems. | |
| 108 * | |
| 109 * This function assumes that a global thread-specific key called "fd_log_thname" exists | |
| 110 * in the address space of the current process. | |
| 111 * | |
| 112 * RETURN VALUE: | |
| 113 * None. | |
| 114 */ | |
| 115 void fd_log_threadname ( char * name ); | |
| 116 extern pthread_key_t fd_log_thname; | |
| 117 | |
| 118 /* | |
| 119 * FUNCTION: fd_log_time | |
| 120 * | |
| 121 * PARAMETERS: | |
| 122 * buf : An array where the time must be stored | |
| 123 * len : size of the buffer | |
| 124 * | |
| 125 * DESCRIPTION: | |
| 126 * Writes the current timestamp (in human readable format) in a buffer. | |
| 127 * | |
| 128 * RETURN VALUE: | |
| 129 * pointer to buf. | |
| 130 */ | |
| 131 char * fd_log_time ( char * buf, size_t len ); | |
| 132 | |
| 133 | |
| 134 /* levels definitions */ | |
| 135 #define NONE 0 /* Display no debug message */ | |
| 136 #define INFO 1 /* Display errors only */ | |
| 137 #define FULL 2 /* Display additional information to follow code execution */ | |
| 138 #define ANNOYING 4 /* Very verbose, for example in loops */ | |
| 139 #define FCTS 6 /* Display entry parameters of most functions */ | |
| 140 #define CALL 9 /* Display calls to most functions (with CHECK macros) */ | |
| 141 | |
| 142 /* Default level is INFO */ | |
| 143 #ifndef TRACE_LEVEL | |
| 144 #define TRACE_LEVEL INFO | |
| 145 #endif /* TRACE_LEVEL */ | |
| 146 | |
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147 /* The level of the file being compiled. */ |
| 0 | 148 static int local_debug_level = TRACE_LEVEL; |
| 149 | |
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150 /* A global level, changed by configuration or cmd line for example. default is 0. */ |
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151 extern int fd_g_debug_lvl; |
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152 |
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153 /* Some portability code to get nice function name in __PRETTY_FUNCTION__ */ |
| 0 | 154 #if __STDC_VERSION__ < 199901L |
| 155 # if __GNUC__ >= 2 | |
| 156 # define __func__ __FUNCTION__ | |
| 157 # else /* __GNUC__ >= 2 */ | |
| 158 # define __func__ "<unknown>" | |
| 159 # endif /* __GNUC__ >= 2 */ | |
| 160 #endif /* __STDC_VERSION__ < 199901L */ | |
| 161 #ifndef __PRETTY_FUNCTION__ | |
| 162 #define __PRETTY_FUNCTION__ __func__ | |
| 163 #endif /* __PRETTY_FUNCTION__ */ | |
| 164 | |
| 165 /* Boolean for tracing at a certain level */ | |
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166 #define TRACE_BOOL(_level_) ( (_level_) <= local_debug_level + fd_g_debug_lvl ) |
| 0 | 167 |
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168 /* The general debug macro, each call results in two lines of debug messages (change the macro for more compact output) */ |
| 0 | 169 #define TRACE_DEBUG(level,format,args... ) { \ |
| 170 if ( TRACE_BOOL(level) ) { \ | |
| 171 char __buf[25]; \ | |
| 172 char * __thn = ((char *)pthread_getspecific(fd_log_thname) ?: "unnamed"); \ | |
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173 fd_log_debug("\t | tid:%-20s\t%s\tin %s@%s:%d\n" \ |
| 0 | 174 "\t%s|%*s" format "\n", \ |
| 175 __thn, fd_log_time(__buf, sizeof(__buf)), __PRETTY_FUNCTION__, __FILE__, __LINE__, \ | |
| 176 (level < FULL)?"@":" ",level, "", ## args); \ | |
| 177 } \ | |
| 178 } | |
| 179 | |
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180 /* Helper for function entry -- for very detailed trace of the execution */ |
| 0 | 181 #define TRACE_ENTRY(_format,_args... ) \ |
| 182 TRACE_DEBUG(FCTS, "->%s (" #_args ") = (" _format ") >", __PRETTY_FUNCTION__, ##_args ); | |
| 183 | |
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184 /* Helper for debugging by adding traces -- for debuging a specific location of the code */ |
| 0 | 185 #define TRACE_HERE() \ |
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186 TRACE_DEBUG(NONE, " -- debug checkpoint -- "); |
| 0 | 187 |
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188 /* Helper for tracing the CHECK_* macros bellow -- very very verbose code execution! */ |
| 0 | 189 #define TRACE_DEBUG_ALL( str ) \ |
| 190 TRACE_DEBUG(CALL, str ); | |
| 191 | |
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192 /* For development only, to keep track of TODO locations in the code */ |
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193 #ifndef ERRORS_ON_TODO |
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194 #define TODO( _msg, _args... ) \ |
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195 TRACE_DEBUG(NONE, "TODO: " _msg , ##_args); |
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196 #else /* ERRORS_ON_TODO */ |
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197 #define TODO( _msg, _args... ) \ |
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198 "TODO" = _msg ## _args; /* just a stupid compilation error to spot the todo */ |
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199 #endif /* ERRORS_ON_TODO */ |
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200 |
| 0 | 201 |
| 202 /* Macros to check a return value and branch out in case of error. | |
| 203 * These macro must be used only when errors are highly improbable, not for expected errors. | |
| 204 */ | |
| 205 | |
| 206 /* Check the return value of a system function and execute fallback in case of error */ | |
| 207 #define CHECK_SYS_DO( __call__, __fallback__ ) { \ | |
| 208 int __ret__; \ | |
| 209 TRACE_DEBUG_ALL( "Check SYS: " #__call__ ); \ | |
| 210 __ret__ = (__call__); \ | |
| 211 if (__ret__ < 0) { \ | |
| 212 int __err__ = errno; /* We may handle EINTR here */ \ | |
| 213 TRACE_DEBUG(NONE, "ERROR: in '" #__call__ "' :\t%s", strerror(__err__));\ | |
| 214 __fallback__; \ | |
| 215 } \ | |
| 216 } | |
| 217 /* Check the return value of a system function, return error code on error */ | |
| 218 #define CHECK_SYS( __call__ ) { \ | |
| 219 int __ret__; \ | |
| 220 TRACE_DEBUG_ALL( "Check SYS: " #__call__ ); \ | |
| 221 __ret__ = (__call__); \ | |
| 222 if (__ret__ < 0) { \ | |
| 223 int __err__ = errno; /* We may handle EINTR here */ \ | |
| 224 TRACE_DEBUG(NONE, "ERROR: in '" #__call__ "' :\t%s", strerror(__err__));\ | |
| 225 return __err__; \ | |
| 226 } \ | |
| 227 } | |
| 228 | |
| 229 /* Check the return value of a POSIX function and execute fallback in case of error or special value */ | |
| 230 #define CHECK_POSIX_DO2( __call__, __speval__, __fallback1__, __fallback2__ ) { \ | |
| 231 int __ret__; \ | |
| 232 TRACE_DEBUG_ALL( "Check POSIX: " #__call__ ); \ | |
| 233 __ret__ = (__call__); \ | |
| 234 if (__ret__ != 0) { \ | |
| 235 if (__ret__ == (__speval__)) { \ | |
| 236 __fallback1__; \ | |
| 237 } else { \ | |
| 238 TRACE_DEBUG(NONE, "ERROR: in '" #__call__ "':\t%s", strerror(__ret__)); \ | |
| 239 __fallback2__; \ | |
| 240 } \ | |
| 241 } \ | |
| 242 } | |
| 243 | |
| 244 /* Check the return value of a POSIX function and execute fallback in case of error */ | |
| 245 #define CHECK_POSIX_DO( __call__, __fallback__ ) \ | |
| 246 CHECK_POSIX_DO2( (__call__), 0, , __fallback__ ); | |
| 247 | |
| 248 /* Check the return value of a POSIX function and return it if error */ | |
| 249 #define CHECK_POSIX( __call__ ) { \ | |
| 250 int __v__; \ | |
| 251 CHECK_POSIX_DO( __v__ = (__call__), return __v__ ); \ | |
| 252 } | |
| 253 | |
| 254 /* Check that a memory allocator did not return NULL, otherwise log an error and execute fallback */ | |
| 255 #define CHECK_MALLOC_DO( __call__, __fallback__ ) { \ | |
| 256 void * __ret__; \ | |
| 257 TRACE_DEBUG_ALL( "Check MALLOC: " #__call__ ); \ | |
| 258 __ret__ = (void *)( __call__ ); \ | |
| 259 if (__ret__ == NULL) { \ | |
| 260 int __err__ = errno; \ | |
| 261 TRACE_DEBUG(NONE, "ERROR: in '" #__call__ "':\t%s", strerror(__err__)); \ | |
| 262 __fallback__; \ | |
| 263 } \ | |
| 264 } | |
| 265 | |
| 266 /* Check that a memory allocator did not return NULL, otherwise return ENOMEM */ | |
| 267 #define CHECK_MALLOC( __call__ ) \ | |
| 268 CHECK_MALLOC_DO( __call__, return ENOMEM ); | |
| 269 | |
| 270 | |
| 271 /* The next macros can be used also for expected errors */ | |
| 272 | |
| 273 /* Check parameters at function entry, execute fallback on error */ | |
| 274 #define CHECK_PARAMS_DO( __bool__, __fallback__ ) \ | |
| 275 TRACE_DEBUG_ALL( "Check PARAMS: " #__bool__ ); \ | |
| 276 if ( ! (__bool__) ) { \ | |
| 277 TRACE_DEBUG(INFO, "Invalid parameter received in '" #__bool__ "'"); \ | |
| 278 __fallback__; \ | |
| 279 } | |
| 280 /* Check parameters at function entry, return EINVAL if the boolean is false (similar to assert) */ | |
| 281 #define CHECK_PARAMS( __bool__ ) \ | |
| 282 CHECK_PARAMS_DO( __bool__, return EINVAL ); | |
| 283 | |
| 284 /* Check the return value of an internal function, log and propagate */ | |
| 285 #define CHECK_FCT_DO( __call__, __fallback__ ) { \ | |
| 286 int __ret__; \ | |
| 287 TRACE_DEBUG_ALL( "Check FCT: " #__call__ ); \ | |
| 288 __ret__ = (__call__); \ | |
| 289 if (__ret__ != 0) { \ | |
| 290 TRACE_DEBUG(INFO, "Error in '" #__call__ "':\t%s", strerror(__ret__)); \ | |
| 291 __fallback__; \ | |
| 292 } \ | |
| 293 } | |
| 294 /* Check the return value of a function call, return any error code */ | |
| 295 #define CHECK_FCT( __call__ ) { \ | |
| 296 int __v__; \ | |
| 297 CHECK_FCT_DO( __v__ = (__call__), return __v__ ); \ | |
| 298 } | |
| 299 | |
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300 |
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301 /*============================================================*/ |
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302 /* MACROS */ |
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303 /*============================================================*/ |
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304 |
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305 /* helper macros (pre-processor hacks to allow macro arguments) */ |
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306 #define __str( arg ) #arg |
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307 #define _stringize( arg ) __str( arg ) |
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308 #define __agr( arg1, arg2 ) arg1 ## arg2 |
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309 #define _aggregate( arg1, arg2 ) __agr( arg1, arg2 ) |
| 0 | 310 |
| 311 /* Some aliases to socket addresses structures */ | |
| 312 #define sSS struct sockaddr_storage | |
| 313 #define sSA struct sockaddr | |
| 314 #define sSA4 struct sockaddr_in | |
| 315 #define sSA6 struct sockaddr_in6 | |
| 316 | |
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317 /* Dump one sockaddr Node information */ |
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318 #define sSA_DUMP_NODE( sa, flag ) { \ |
| 0 | 319 sSA * __sa = (sSA *)(sa); \ |
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320 char __addrbuf[INET6_ADDRSTRLEN]; \ |
| 0 | 321 if (__sa) { \ |
| 322 int __rc = getnameinfo(__sa, \ | |
| 323 sizeof(sSS), \ | |
| 324 __addrbuf, \ | |
| 325 sizeof(__addrbuf), \ | |
| 326 NULL, \ | |
| 327 0, \ | |
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328 flag); \ |
| 0 | 329 if (__rc) \ |
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330 fd_log_debug((char *)gai_strerror(__rc)); \ |
| 0 | 331 else \ |
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332 fd_log_debug(&__addrbuf[0]); \ |
| 0 | 333 } else { \ |
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334 fd_log_debug("(NULL / ANY)"); \ |
| 0 | 335 } \ |
| 336 } | |
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337 /* if needed, add sSA_DUMP_SERVICE */ |
| 0 | 338 |
| 339 /* The sockaddr length of a sSS structure */ | |
| 340 #define sSSlen( _ss_ ) \ | |
| 341 ( (socklen_t) ( ((_ss_)->ss_family == AF_INET) ? (sizeof(sSA4)) : \ | |
| 342 (((_ss_)->ss_family == AF_INET6) ? (sizeof(sSA6)) : \ | |
| 343 0 ) ) ) | |
| 344 | |
| 345 /* Define the value of IP loopback address */ | |
| 346 #ifndef INADDR_LOOPBACK | |
| 347 #define INADDR_LOOPBACK inet_addr("127.0.0.1") | |
| 348 #endif /* INADDR_LOOPBACK */ | |
| 349 | |
| 350 /* create a V4MAPPED address */ | |
| 351 #define IN6_ADDR_V4MAP( a6, a4 ) { \ | |
| 352 ((uint32_t *)(a6))[0] = 0; \ | |
| 353 ((uint32_t *)(a6))[1] = 0; \ | |
| 354 ((uint32_t *)(a6))[2] = htonl(0xffff); \ | |
| 355 ((uint32_t *)(a6))[3] = (uint32_t)(a4); \ | |
| 356 } | |
| 357 | |
| 358 /* Retrieve a v4 value from V4MAPPED address ( takes a s6_addr as param) */ | |
| 359 #define IN6_ADDR_V4UNMAP( a6 ) \ | |
| 360 (((in_addr_t *)(a6))[3]) | |
| 361 | |
| 362 | |
| 363 /* We provide macros to convert 64 bit values to and from network byte-order, on systems where it is not already provided. */ | |
| 364 #ifndef HAVE_NTOHLL /* Defined in config.h, if the ntohll symbol is defined on the system */ | |
| 365 # if HOST_BIG_ENDIAN | |
| 366 /* In big-endian systems, we don't have to change the values, since the order is the same as network */ | |
| 367 # define ntohll(x) (x) | |
| 368 # define htonll(x) (x) | |
| 369 # else /* HOST_BIG_ENDIAN */ | |
| 370 /* For these systems, we must reverse the bytes. Use ntohl and htonl on sub-32 blocs, and inverse these blocs. */ | |
| 371 # define ntohll(x) (typeof (x))( (((uint64_t)ntohl( (uint32_t)(x))) << 32 ) | ((uint64_t) ntohl( ((uint64_t)(x)) >> 32 ))) | |
| 372 # define htonll(x) (typeof (x))( (((uint64_t)htonl( (uint32_t)(x))) << 32 ) | ((uint64_t) htonl( ((uint64_t)(x)) >> 32 ))) | |
| 373 # endif /* HOST_BIG_ENDIAN */ | |
| 374 #endif /* HAVE_NTOHLL */ | |
| 375 | |
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376 /* This macro will give the next multiple of 4 for an integer (used for padding sizes of AVP). */ |
| 0 | 377 #define PAD4(_x) ((_x) + ( (4 - (_x)) & 3 ) ) |
| 378 | |
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379 /* Useful to display as safe ASCII a value (will garbage UTF-8 output...) */ |
| 0 | 380 #define ASCII(_c) ( ((_c < 32) || (_c > 127)) ? ( _c ? '?' : ' ' ) : _c ) |
| 381 | |
| 382 /* Compare timespec structures */ | |
| 383 #define TS_IS_INFERIOR( ts1, ts2 ) \ | |
| 384 ( ((ts1)->tv_sec < (ts2)->tv_sec ) \ | |
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385 || (((ts1)->tv_sec == (ts2)->tv_sec ) && ((ts1)->tv_nsec < (ts2)->tv_nsec) )) |
| 0 | 386 |
| 387 | |
| 388 /*============================================================*/ | |
| 389 /* THREADS */ | |
| 390 /*============================================================*/ | |
| 391 | |
| 392 /* Terminate a thread */ | |
| 393 static __inline__ int fd_thr_term(pthread_t * th) | |
| 394 { | |
| 395 int ret = 0; | |
| 396 void * th_ret = NULL; | |
| 397 | |
| 398 CHECK_PARAMS(th); | |
| 399 | |
| 400 /* Test if it was already terminated */ | |
| 401 if (*th == (pthread_t)NULL) | |
| 402 return 0; | |
| 403 | |
| 404 /* Cancel the thread if it is still running - ignore error if it was already terminated */ | |
| 405 (void) pthread_cancel(*th); | |
| 406 | |
| 407 /* Then join the thread */ | |
| 408 CHECK_POSIX_DO( ret = pthread_join(*th, &th_ret), /* continue */ ); | |
| 409 | |
| 410 if (th_ret != NULL) { | |
| 411 TRACE_DEBUG(FULL, "The thread returned the following value: %p (ignored)", th_ret); | |
| 412 } | |
| 413 | |
| 414 /* Clean the location */ | |
| 415 *th = (pthread_t)NULL; | |
| 416 | |
| 417 return ret; | |
| 418 } | |
| 419 | |
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420 /* Cleanups for cancellation (all threads should be safely cancelable...) */ |
| 0 | 421 static __inline__ void fd_cleanup_mutex( void * mutex ) |
| 422 { | |
| 423 CHECK_POSIX_DO( pthread_mutex_unlock((pthread_mutex_t *)mutex), /* */); | |
| 424 } | |
| 425 | |
| 426 static __inline__ void fd_cleanup_rwlock( void * rwlock ) | |
| 427 { | |
| 428 CHECK_POSIX_DO( pthread_rwlock_unlock((pthread_rwlock_t *)rwlock), /* */); | |
| 429 } | |
| 430 | |
| 431 static __inline__ void fd_cleanup_buffer( void * buffer ) | |
| 432 { | |
| 433 free(buffer); | |
| 434 } | |
| 435 | |
| 436 /*============================================================*/ | |
| 437 /* LISTS */ | |
| 438 /*============================================================*/ | |
| 439 | |
| 440 /* The following structure represents a chained list element */ | |
| 441 struct fd_list { | |
| 442 struct fd_list *next; /* next element in the list */ | |
| 443 struct fd_list *prev; /* previous element in the list */ | |
| 444 struct fd_list *head; /* head of the list */ | |
| 445 void *o; /* additional avialbe pointer used for start of the parento object or other purpose */ | |
| 446 }; | |
| 447 | |
| 448 /* Initialize a list element */ | |
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449 #define FD_LIST_INITIALIZER( _list_name ) \ |
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450 { .next = & _list_name, .prev = & _list_name, .head = & _list_name, .o = NULL } |
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451 #define FD_LIST_INITIALIZER_O( _list_name, _obj ) \ |
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452 { .next = & _list_name, .prev = & _list_name, .head = & _list_name, .o = _obj } |
| 0 | 453 void fd_list_init ( struct fd_list * list, void *obj ); |
| 454 | |
| 455 /* Return boolean, true if the list is empty */ | |
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456 #define FD_IS_LIST_EMPTY( _list ) ((((struct fd_list *)(_list))->head == (_list)) && (((struct fd_list *)(_list))->next == (_list))) |
| 0 | 457 |
| 458 /* Insert an item in a list at known position */ | |
| 459 void fd_list_insert_after ( struct fd_list * ref, struct fd_list * item ); | |
| 460 void fd_list_insert_before ( struct fd_list * ref, struct fd_list * item ); | |
| 461 | |
| 462 /* Insert an item in an ordered list -- ordering function provided. If duplicate object found, EEXIST and it is returned in ref_duplicate */ | |
| 463 int fd_list_insert_ordered( struct fd_list * head, struct fd_list * item, int (*cmp_fct)(void *, void *), void ** ref_duplicate); | |
| 464 | |
| 465 /* Unlink an item from a list */ | |
| 466 void fd_list_unlink ( struct fd_list * item ); | |
| 467 | |
| 468 /* Compute a hash value of a string (session id, diameter id, ...) */ | |
| 469 uint32_t fd_hash ( char * string, size_t len ); | |
| 470 | |
| 471 | |
| 472 | |
| 473 /*============================================================*/ | |
| 474 /* DICTIONARY */ | |
| 475 /*============================================================*/ | |
| 476 /* Structure that contains the complete dictionary definitions */ | |
| 477 struct dictionary; | |
| 478 | |
| 479 /* Structure that contains a dictionary object */ | |
| 480 struct dict_object; | |
| 481 | |
| 482 /* Types of object in the dictionary. */ | |
| 483 enum dict_object_type { | |
| 484 DICT_VENDOR = 1, /* Vendor */ | |
| 485 DICT_APPLICATION, /* Diameter Application */ | |
| 486 DICT_TYPE, /* AVP data type */ | |
| 487 DICT_ENUMVAL, /* Named constant (value of an enumerated AVP type) */ | |
| 488 DICT_AVP, /* AVP */ | |
| 489 DICT_COMMAND, /* Diameter Command */ | |
| 490 DICT_RULE /* a Rule for AVP in command or grouped AVP */ | |
| 491 #define DICT_TYPE_MAX DICT_RULE | |
| 492 }; | |
| 493 | |
| 494 /* Initialize a dictionary */ | |
| 495 int fd_dict_init(struct dictionary ** dict); | |
| 496 /* Destroy a dictionary */ | |
| 497 int fd_dict_fini(struct dictionary ** dict); | |
| 498 | |
| 499 /* | |
| 500 * FUNCTION: fd_dict_new | |
| 501 * | |
| 502 * PARAMETERS: | |
| 503 * dict : Pointer to the dictionnary where the object is created | |
| 504 * type : What kind of object must be created | |
| 505 * data : pointer to the data for the object. | |
| 506 * type parameter is used to determine the type of data (see bellow for detail). | |
| 507 * parent : a reference to a parent object, if needed. | |
| 508 * ref : upon successful creation, reference to new object is stored here if !null. | |
| 509 * | |
| 510 * DESCRIPTION: | |
| 511 * Create a new object in the dictionary. | |
| 512 * See following object sections in this header file for more information on data and parent parameters format. | |
| 513 * | |
| 514 * RETURN VALUE: | |
| 515 * 0 : The object is created in the dictionary. | |
| 516 * EINVAL : A parameter is invalid. | |
| 517 * EEXIST : This object is already defined in the dictionary (with conflicting data). | |
| 518 * If "ref" is not NULL, it points to the existing element on return. | |
| 519 * (other standard errors may be returned, too, with their standard meaning. Example: | |
| 520 * ENOMEM : Memory allocation for the new object element failed.) | |
| 521 */ | |
| 522 int fd_dict_new ( struct dictionary * dict, enum dict_object_type type, void * data, struct dict_object * parent, struct dict_object **ref ); | |
| 523 | |
| 524 /* | |
| 525 * FUNCTION: fd_dict_search | |
| 526 * | |
| 527 * PARAMETERS: | |
| 528 * dict : Pointer to the dictionnary where the object is searched | |
| 529 * type : type of object that is being searched | |
| 530 * criteria : how the object must be searched. See object-related sections bellow for more information. | |
| 531 * what : depending on criteria, the data that must be searched. | |
| 532 * result : On successful return, pointer to the object is stored here. | |
| 533 * retval : this value is returned if the object is not found and result is not NULL. | |
| 534 * | |
| 535 * DESCRIPTION: | |
| 536 * Perform a search in the dictionary. | |
| 537 * See the object-specific sections bellow to find how to look for each objects. | |
| 538 * If the "result" parameter is NULL, the function is used to check if an object is in the dictionary. | |
| 539 * Otherwise, a reference to the object is stored in result if found. | |
| 540 * If result is not NULL and the object is not found, retval is returned (should be 0 or ENOENT usually) | |
| 541 * | |
| 542 * RETURN VALUE: | |
| 543 * 0 : The object has been found in the dictionary, or *result is NULL. | |
| 544 * EINVAL : A parameter is invalid. | |
| 545 * ENOENT : No matching object has been found, and result was NULL. | |
| 546 */ | |
| 547 int fd_dict_search ( struct dictionary * dict, enum dict_object_type type, int criteria, void * what, struct dict_object **result, int retval ); | |
| 548 | |
| 549 /* Special case: get the generic error command object */ | |
| 550 int fd_dict_get_error_cmd(struct dictionary * dict, struct dict_object **obj); | |
| 551 | |
| 552 /* | |
| 553 * FUNCTION: fd_dict_getval | |
| 554 * | |
| 555 * PARAMETERS: | |
| 556 * object : Pointer to a dictionary object. | |
| 557 * data : pointer to a structure to hold the data for the object. | |
| 558 * The type is the same as "data" parameter in fd_dict_new function. | |
| 559 * | |
| 560 * DESCRIPTION: | |
| 561 * Retrieve content of a dictionary object. | |
| 562 * See following object sections in this header file for more information on data and parent parameters format. | |
| 563 * | |
| 564 * RETURN VALUE: | |
| 565 * 0 : The content of the object has been retrieved. | |
| 566 * EINVAL : A parameter is invalid. | |
| 567 */ | |
| 568 int fd_dict_getval ( struct dict_object * object, void * val); | |
| 569 int fd_dict_gettype ( struct dict_object * object, enum dict_object_type * type); | |
| 570 int fd_dict_getdict ( struct dict_object * object, struct dictionary ** dict); | |
| 571 | |
| 572 /* Debug functions */ | |
| 573 void fd_dict_dump_object(struct dict_object * obj); | |
| 574 void fd_dict_dump(struct dictionary * dict); | |
| 575 | |
| 576 | |
| 577 /* | |
| 578 *************************************************************************** | |
| 579 * | |
| 580 * Vendor object | |
| 581 * | |
| 582 * These types are used to manage vendors in the dictionary | |
| 583 * | |
| 584 *************************************************************************** | |
| 585 */ | |
| 586 | |
| 587 /* Type to hold a Vendor ID: "SMI Network Management Private Enterprise Codes" (RFC3232) */ | |
| 588 typedef uint32_t vendor_id_t; | |
| 589 | |
| 590 /* Type to hold data associated to a vendor */ | |
| 591 struct dict_vendor_data { | |
| 592 vendor_id_t vendor_id; /* ID of a vendor */ | |
| 593 char *vendor_name; /* The name of this vendor */ | |
| 594 }; | |
| 595 | |
| 596 /* The criteria for searching a vendor object in the dictionary */ | |
| 597 enum { | |
| 598 VENDOR_BY_ID = 10, /* "what" points to a vendor_id_t */ | |
| 599 VENDOR_BY_NAME, /* "what" points to a string */ | |
| 600 VENDOR_OF_APPLICATION /* "what" points to a struct dict_object containing an application (see bellow) */ | |
| 601 }; | |
| 602 | |
| 603 /*** | |
| 604 * API usage : | |
| 605 | |
| 606 Note: the value of "vendor_name" is copied when the object is created, and the string may be disposed afterwards. | |
| 607 On the other side, when value is retrieved with dict_getval, the string is not copied and MUST NOT be freed. It will | |
| 608 be freed automatically along with the object itself with call to dict_fini later. | |
| 609 | |
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610 - fd_dict_new: |
| 0 | 611 The "parent" parameter is not used for vendors. |
| 612 Sample code to create a vendor: | |
| 613 { | |
| 614 int ret; | |
| 615 struct dict_object * myvendor; | |
| 616 struct dict_vendor_data myvendordata = { 23455, "my vendor name" }; -- just an example... | |
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617 ret = fd_dict_new ( dict, DICT_VENDOR, &myvendordata, NULL, &myvendor ); |
| 0 | 618 } |
| 619 | |
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620 - fd_dict_search: |
| 0 | 621 Sample codes to look for a vendor object, by its id or name: |
| 622 { | |
| 623 int ret; | |
| 624 struct dict_object * vendor_found; | |
| 625 vendor_id_t vendorid = 23455; | |
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626 ret = fd_dict_search ( dict, DICT_VENDOR, VENDOR_BY_ID, &vendorid, &vendor_found, ENOENT); |
| 0 | 627 - or - |
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628 ret = fd_dict_search ( dict, DICT_VENDOR, VENDOR_BY_NAME, "my vendor name", &vendor_found, ENOENT); |
| 0 | 629 } |
| 630 | |
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631 - fd_dict_getval: |
| 0 | 632 Sample code to retrieve the data from a vendor object: |
| 633 { | |
| 634 int ret; | |
| 635 struct dict_object * myvendor; | |
| 636 struct dict_vendor_data myvendordata; | |
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637 ret = fd_dict_search ( dict, DICT_VENDOR, VENDOR_BY_NAME, "my vendor name", &myvendor, ENOENT); |
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638 ret = fd_dict_getval ( myvendor, &myvendordata ); |
| 0 | 639 printf("my vendor id: %d\n", myvendordata.vendor_id ); |
| 640 } | |
| 641 | |
| 642 | |
| 643 */ | |
| 644 | |
| 645 /* | |
| 646 *************************************************************************** | |
| 647 * | |
| 648 * Application object | |
| 649 * | |
| 650 * These types are used to manage Diameter applications in the dictionary | |
| 651 * | |
| 652 *************************************************************************** | |
| 653 */ | |
| 654 | |
| 655 /* Type to hold a Diameter application ID: IANA assigned value for this application. */ | |
| 656 typedef uint32_t application_id_t; | |
| 657 | |
| 658 /* Type to hold data associated to an application */ | |
| 659 struct dict_application_data { | |
| 660 application_id_t application_id; /* ID of the application */ | |
| 661 char *application_name; /* The name of this application */ | |
| 662 }; | |
| 663 | |
| 664 /* The criteria for searching an application object in the dictionary */ | |
| 665 enum { | |
| 666 APPLICATION_BY_ID = 20, /* "what" points to a application_id_t */ | |
| 667 APPLICATION_BY_NAME, /* "what" points to a string */ | |
| 668 APPLICATION_OF_TYPE, /* "what" points to a struct dict_object containing a type object (see bellow) */ | |
| 669 APPLICATION_OF_COMMAND /* "what" points to a struct dict_object containing a command (see bellow) */ | |
| 670 }; | |
| 671 | |
| 672 /*** | |
| 673 * API usage : | |
| 674 | |
| 675 The "parent" parameter of dict_new may point to a vendor object to inform of what vendor defines the application. | |
| 676 for standard-track applications, the "parent" parameter should be NULL. | |
| 677 The vendor associated to an application is retrieved with VENDOR_OF_APPLICATION search criteria on vendors. | |
| 678 | |
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679 - fd_dict_new: |
| 0 | 680 Sample code for application creation: |
| 681 { | |
| 682 int ret; | |
| 683 struct dict_object * vendor; | |
| 684 struct dict_object * appl; | |
| 685 struct dict_vendor_data vendor_data = { | |
| 686 23455, | |
| 687 "my vendor name" | |
| 688 }; | |
| 689 struct dict_application_data app_data = { | |
| 690 9789, | |
| 691 "my vendor's application" | |
| 692 }; | |
| 693 | |
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694 ret = fd_dict_new ( dict, DICT_VENDOR, &vendor_data, NULL, &vendor ); |
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695 ret = fd_dict_new ( dict, DICT_APPLICATION, &app_data, vendor, &appl ); |
| 0 | 696 } |
| 697 | |
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698 - fd_dict_search: |
| 0 | 699 Sample code to retrieve the vendor of an application |
| 700 { | |
| 701 int ret; | |
| 702 struct dict_object * vendor, * appli; | |
| 703 | |
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704 ret = fd_dict_search ( dict, DICT_APPLICATION, APPLICATION_BY_NAME, "my vendor's application", &appli, ENOENT); |
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705 ret = fd_dict_search ( dict, DICT_VENDOR, VENDOR_OF_APPLICATION, appli, &vendor, ENOENT); |
| 0 | 706 } |
| 707 | |
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708 - fd_dict_getval: |
| 0 | 709 Sample code to retrieve the data from an application object: |
| 710 { | |
| 711 int ret; | |
| 712 struct dict_object * appli; | |
| 713 struct dict_application_data appl_data; | |
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714 ret = fd_dict_search ( dict, DICT_APPLICATION, APPLICATION_BY_NAME, "my vendor's application", &appli, ENOENT); |
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715 ret = fd_dict_getval ( appli, &appl_data ); |
| 0 | 716 printf("my application id: %s\n", appl_data.application_id ); |
| 717 } | |
| 718 | |
| 719 */ | |
| 720 | |
| 721 /* | |
| 722 *************************************************************************** | |
| 723 * | |
| 724 * Type object | |
| 725 * | |
| 726 * These types are used to manage AVP data types in the dictionary | |
| 727 * | |
| 728 *************************************************************************** | |
| 729 */ | |
| 730 | |
| 731 /* Type to store any AVP value */ | |
| 732 union avp_value { | |
| 733 struct { | |
| 734 uint8_t *data; /* bytes buffer */ | |
| 735 size_t len; /* length of the data buffer */ | |
| 736 } os; /* Storage for an octet string, data is alloc'd and must be freed */ | |
| 737 int32_t i32; /* integer 32 */ | |
| 738 int64_t i64; /* integer 64 */ | |
| 739 uint32_t u32; /* unsigned 32 */ | |
| 740 uint64_t u64; /* unsigned 64 */ | |
| 741 float f32; /* float 32 */ | |
| 742 double f64; /* float 64 */ | |
| 743 }; | |
| 744 | |
| 745 /* These are the basic AVP types defined in RFC3588bis */ | |
| 746 enum dict_avp_basetype { | |
| 747 AVP_TYPE_GROUPED, | |
| 748 AVP_TYPE_OCTETSTRING, | |
| 749 AVP_TYPE_INTEGER32, | |
| 750 AVP_TYPE_INTEGER64, | |
| 751 AVP_TYPE_UNSIGNED32, | |
| 752 AVP_TYPE_UNSIGNED64, | |
| 753 AVP_TYPE_FLOAT32, | |
| 754 AVP_TYPE_FLOAT64 | |
| 755 #define AVP_TYPE_MAX AVP_TYPE_FLOAT64 | |
| 756 }; | |
| 757 | |
| 758 /* Callbacks that can be associated with a derived type to easily interpret the AVP value. */ | |
| 759 /* | |
| 760 * CALLBACK: dict_avpdata_interpret | |
| 761 * | |
| 762 * PARAMETERS: | |
| 763 * val : Pointer to the AVP value that must be interpreted. | |
| 764 * interpreted : The result of interpretation is stored here. The format and meaning depends on each type. | |
| 765 * | |
| 766 * DESCRIPTION: | |
| 767 * This callback can be provided with a derived type in order to facilitate the interpretation of formated data. | |
| 768 * For example, when an AVP of type "Address" is received, it can be used to convert the octetstring into a struct sockaddr. | |
| 769 * This callback is not called directly, but through the message's API msg_avp_value_interpret function. | |
| 770 * | |
| 771 * RETURN VALUE: | |
| 772 * 0 : Operation complete. | |
| 773 * !0 : An error occurred, the error code is returned. | |
| 774 */ | |
| 775 typedef int (*dict_avpdata_interpret) (union avp_value * value, void * interpreted); | |
| 776 /* | |
| 777 * CALLBACK: dict_avpdata_encode | |
| 778 * | |
| 779 * PARAMETERS: | |
| 780 * data : The formated data that must be stored in the AVP value. | |
| 781 * val : Pointer to the AVP value storage area where the data must be stored. | |
| 782 * | |
| 783 * DESCRIPTION: | |
| 784 * This callback can be provided with a derived type in order to facilitate the encoding of formated data. | |
| 785 * For example, it can be used to convert a struct sockaddr in an AVP value of type Address. | |
| 786 * This callback is not called directly, but through the message's API msg_avp_value_encode function. | |
| 787 * If the callback is defined for an OctetString based type, the created string must be malloc'd. free will be called | |
| 788 * automatically later. | |
| 789 * | |
| 790 * RETURN VALUE: | |
| 791 * 0 : Operation complete. | |
| 792 * !0 : An error occurred, the error code is returned. | |
| 793 */ | |
| 794 typedef int (*dict_avpdata_encode) (void * data, union avp_value * val); | |
| 795 | |
| 796 | |
| 797 /* Type to hold data associated to a derived AVP data type */ | |
| 798 struct dict_type_data { | |
| 799 enum dict_avp_basetype type_base; /* How the data of such AVP must be interpreted */ | |
| 800 char *type_name; /* The name of this type */ | |
| 801 dict_avpdata_interpret type_interpret;/* cb to convert the AVP value in more comprehensive format (or NULL) */ | |
| 802 dict_avpdata_encode type_encode; /* cb to convert formatted data into an AVP value (or NULL) */ | |
| 803 }; | |
| 804 | |
| 805 /* The criteria for searching a type object in the dictionary */ | |
| 806 enum { | |
| 807 TYPE_BY_NAME = 30, /* "what" points to a string */ | |
| 808 TYPE_OF_ENUMVAL, /* "what" points to a struct dict_object containing an enumerated constant (DICT_ENUMVAL, see bellow). */ | |
| 809 TYPE_OF_AVP /* "what" points to a struct dict_object containing an AVP object. */ | |
| 810 }; | |
| 811 | |
| 812 | |
| 813 /*** | |
| 814 * API usage : | |
| 815 | |
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816 - fd_dict_new: |
| 0 | 817 The "parent" parameter may point to an application object, when a type is defined by a Diameter application. |
| 818 | |
| 819 Sample code: | |
| 820 { | |
| 821 int ret; | |
| 822 struct dict_object * mytype; | |
| 823 struct dict_type_data mytypedata = | |
| 824 { | |
| 825 AVP_TYPE_OCTETSTRING, | |
| 826 "Address", | |
| 827 NULL, | |
| 828 NULL | |
| 829 }; | |
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830 ret = fd_dict_new ( dict, DICT_TYPE, &mytypedata, NULL, &mytype ); |
| 0 | 831 } |
| 832 | |
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833 - fd_dict_search: |
| 0 | 834 Sample code: |
| 835 { | |
| 836 int ret; | |
| 837 struct dict_object * address_type; | |
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838 ret = fd_dict_search ( dict, DICT_TYPE, TYPE_BY_NAME, "Address", &address_type, ENOENT); |
| 0 | 839 } |
| 840 | |
| 841 */ | |
| 842 | |
| 843 /* | |
| 844 *************************************************************************** | |
| 845 * | |
| 846 * Enumerated values object | |
| 847 * | |
| 848 * These types are used to manage named constants of some AVP, | |
| 849 * for enumerated types. Waaad allows contants for types others than Unsigned32 | |
| 850 * | |
| 851 *************************************************************************** | |
| 852 */ | |
| 853 | |
| 854 /* Type to hold data of named constants for AVP */ | |
| 855 struct dict_enumval_data { | |
| 856 char *enum_name; /* The name of this constant */ | |
| 857 union avp_value enum_value; /* Value of the constant. Union term depends on parent type's base type. */ | |
| 858 }; | |
| 859 | |
| 860 /* The criteria for searching a constant in the dictionary */ | |
| 861 enum { | |
| 862 ENUMVAL_BY_STRUCT = 40, /* "what" points to a struct dict_enumval_request as defined bellow */ | |
| 863 }; | |
| 864 | |
| 865 struct dict_enumval_request { | |
| 866 /* Identifier of the parent type, one of the following must not be NULL */ | |
| 867 struct dict_object *type_obj; | |
| 868 char *type_name; | |
| 869 | |
| 870 /* Search criteria for the constant */ | |
| 871 struct dict_enumval_data search; /* search.enum_value is used only if search.enum_name == NULL */ | |
| 872 }; | |
| 873 | |
| 874 /*** | |
| 875 * API usage : | |
| 876 | |
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877 - fd_dict_new: |
| 0 | 878 The "parent" parameter must point to a derived type object. |
| 879 Sample code to create a type "Boolean" with two constants "True" and "False": | |
| 880 { | |
| 881 int ret; | |
| 882 struct dict_object * type_boolean; | |
| 883 struct dict_type_data type_boolean_data = | |
| 884 { | |
| 885 AVP_TYPE_INTEGER32, | |
| 886 "Boolean", | |
| 887 NULL, | |
| 888 NULL | |
| 889 }; | |
| 890 struct dict_enumval_data boolean_false = | |
| 891 { | |
| 892 .enum_name="False", | |
| 893 .enum_value.i32 = 0 | |
| 894 }; | |
| 895 struct dict_enumval_data boolean_true = | |
| 896 { | |
| 897 .enum_name="True", | |
| 898 .enum_value.i32 = -1 | |
| 899 }; | |
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900 ret = fd_dict_new ( dict, DICT_TYPE, &type_boolean_data, NULL, &type_boolean ); |
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901 ret = fd_dict_new ( dict, DICT_ENUMVAL, &boolean_false, type_boolean, NULL ); |
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902 ret = fd_dict_new ( dict, DICT_ENUMVAL, &boolean_true , type_boolean, NULL ); |
| 0 | 903 |
| 904 } | |
| 905 | |
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906 - fd_dict_search: |
| 0 | 907 Sample code to look for a constant name, by its value: |
| 908 { | |
| 909 int ret; | |
| 910 struct dict_object * value_found; | |
| 911 struct dict_enumval_request boolean_by_value = | |
| 912 { | |
| 913 .type_name = "Boolean", | |
| 914 .search.enum_name=NULL, | |
| 915 .search.enum_value.i32 = -1 | |
| 916 }; | |
| 917 | |
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918 ret = fd_dict_search ( dict, DICT_ENUMVAL, ENUMVAL_BY_STRUCT, &boolean_by_value, &value_found, ENOENT); |
| 0 | 919 } |
| 920 | |
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921 - fd_dict_getval: |
| 0 | 922 Sample code to retrieve the data from a constant object: |
| 923 { | |
| 924 int ret; | |
| 925 struct dict_object * value_found; | |
| 926 struct dict_enumval_data boolean_data = NULL; | |
| 927 struct dict_enumval_request boolean_by_value = | |
| 928 { | |
| 929 .type_name = "Boolean", | |
| 930 .search.enum_name=NULL, | |
| 931 .search.enum_value.i32 = 0 | |
| 932 }; | |
| 933 | |
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934 ret = fd_dict_search ( dict, DICT_ENUMVAL, ENUMVAL_BY_STRUCT, &boolean_by_value, &value_found, ENOENT); |
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935 ret = fd_dict_getval ( value_found, &boolean_data ); |
| 0 | 936 printf(" Boolean with value 0: %s", boolean_data.enum_name ); |
| 937 } | |
| 938 */ | |
| 939 | |
| 940 /* | |
| 941 *************************************************************************** | |
| 942 * | |
| 943 * AVP object | |
| 944 * | |
| 945 * These objects are used to manage AVP definitions in the dictionary | |
| 946 * | |
| 947 *************************************************************************** | |
| 948 */ | |
| 949 | |
| 950 /* Type to hold an AVP code. For vendor 0, these codes are assigned by IANA. Otherwise, it is managed by the vendor */ | |
| 951 typedef uint32_t avp_code_t; | |
| 952 | |
| 953 /* Values of AVP flags */ | |
| 954 #define AVP_FLAG_VENDOR 0x80 | |
| 955 #define AVP_FLAG_MANDATORY 0x40 | |
| 956 #define AVP_FLAG_RESERVED3 0x20 | |
| 957 #define AVP_FLAG_RESERVED4 0x10 | |
| 958 #define AVP_FLAG_RESERVED5 0x08 | |
| 959 #define AVP_FLAG_RESERVED6 0x04 | |
| 960 #define AVP_FLAG_RESERVED7 0x02 | |
| 961 #define AVP_FLAG_RESERVED8 0x01 | |
| 962 | |
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963 /* For dumping flags and values */ |
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964 #define DUMP_AVPFL_str "%c%c" |
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965 #define DUMP_AVPFL_val(_val) (_val & AVP_FLAG_VENDOR)?'V':'-' , (_val & AVP_FLAG_MANDATORY)?'M':'-' |
| 0 | 966 |
| 967 /* Type to hold data associated to an avp */ | |
| 968 struct dict_avp_data { | |
| 969 avp_code_t avp_code; /* Code of the avp */ | |
| 970 vendor_id_t avp_vendor; /* Vendor of the AVP, or 0 */ | |
| 971 char *avp_name; /* Name of this AVP */ | |
| 972 uint8_t avp_flag_mask; /* Mask of fixed AVP flags */ | |
| 973 uint8_t avp_flag_val; /* Values of the fixed flags */ | |
| 974 enum dict_avp_basetype avp_basetype; /* Basic type of data found in the AVP */ | |
| 975 }; | |
| 976 | |
| 977 /* The criteria for searching an avp object in the dictionary */ | |
| 978 enum { | |
| 979 AVP_BY_CODE = 50, /* "what" points to an avp_code_t, vendor is always 0 */ | |
| 980 AVP_BY_NAME, /* "what" points to a string, vendor is always 0 */ | |
| 981 AVP_BY_CODE_AND_VENDOR, /* "what" points to a struct dict_avp_request (see bellow), where avp_vendor and avp_code are set */ | |
| 982 AVP_BY_NAME_AND_VENDOR /* "what" points to a struct dict_avp_request (see bellow), where avp_vendor and avp_name are set */ | |
| 983 }; | |
| 984 | |
| 985 /* Struct used for some researchs */ | |
| 986 struct dict_avp_request { | |
| 987 vendor_id_t avp_vendor; | |
| 988 avp_code_t avp_code; | |
| 989 char *avp_name; | |
| 990 }; | |
| 991 | |
| 992 | |
| 993 /*** | |
| 994 * API usage : | |
| 995 | |
| 996 If "parent" parameter is not NULL during AVP creation, it must point to a DICT_TYPE object. | |
| 997 The extended type is then attached to the AVP. In case where it is an enumerated type, the value of | |
| 998 AVP is automatically interpreted in debug messages, and in message checks. | |
| 999 The derived type of an AVP can be retrieved with: dict_search ( DICT_TYPE, TYPE_OF_AVP, avp, ... ) | |
| 1000 | |
| 1001 To create the rules (ABNF) for children of Grouped AVP, see the DICT_RULE related part. | |
| 1002 | |
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1003 - fd_dict_new: |
| 0 | 1004 Sample code for AVP creation: |
| 1005 { | |
| 1006 int ret; | |
| 1007 struct dict_object * user_name_avp; | |
| 1008 struct dict_object * boolean_type; | |
| 1009 struct dict_object * sample_boolean_avp; | |
| 1010 struct dict_avp_data user_name_data = { | |
| 1011 1, // code | |
| 1012 0, // vendor | |
| 1013 "User-Name", // name | |
| 1014 AVP_FLAG_VENDOR | AVP_FLAG_MANDATORY, // fixed mask: V and M values must always be defined as follow. other flags can be set or cleared | |
| 1015 AVP_FLAG_MANDATORY, // the V flag must be cleared, the M flag must be set. | |
| 1016 AVP_TYPE_OCTETSTRING // User-Name AVP contains OctetString data (further precision such as UTF8String can be given with a parent derived type) | |
| 1017 }; | |
| 1018 struct dict_avp_data sample_boolean_data = { | |
| 1019 31337, | |
| 1020 23455, | |
| 1021 "Sample-Boolean", | |
| 1022 AVP_FLAG_VENDOR | AVP_FLAG_MANDATORY, | |
| 1023 AVP_FLAG_VENDOR, | |
| 1024 AVP_TYPE_INTEGER32 // This MUST be the same as parent type's | |
| 1025 }; | |
| 1026 | |
| 1027 -- Create an AVP with a base type -- | |
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1028 ret = fd_dict_new ( dict, DICT_AVP, &user_name_data, NULL, &user_name_avp ); |
| 0 | 1029 |
| 1030 -- Create an AVP with a derived type -- | |
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1031 ret = fd_dict_search ( dict, DICT_TYPE, TYPE_BY_NAME, "Boolean", &boolean_type, ENOENT); |
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1032 ret = fd_dict_new ( dict, DICT_AVP, &sample_boolean_data , boolean_type, &sample_boolean_avp ); |
| 0 | 1033 |
| 1034 } | |
| 1035 | |
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1036 - fd_dict_search: |
| 0 | 1037 Sample code to look for an AVP |
| 1038 { | |
| 1039 int ret; | |
| 1040 struct dict_object * avp_username; | |
| 1041 struct dict_object * avp_sampleboolean; | |
| 1042 struct dict_avp_request avpvendorboolean = | |
| 1043 { | |
| 1044 .avp_vendor = 23455, | |
| 1045 .avp_name = "Sample-Boolean" | |
| 1046 }; | |
| 1047 | |
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1048 ret = fd_dict_search ( dict, DICT_AVP, AVP_BY_NAME, "User-Name", &avp_username, ENOENT); |
| 0 | 1049 |
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1050 ret = fd_dict_search ( dict, DICT_AVP, AVP_BY_NAME_AND_VENDOR, &avpvendorboolean, &avp_sampleboolean, ENOENT); |
| 0 | 1051 |
| 1052 } | |
| 1053 | |
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1054 - fd_dict_getval: |
| 0 | 1055 Sample code to retrieve the data from an AVP object: |
| 1056 { | |
| 1057 int ret; | |
| 1058 struct dict_object * avp_username; | |
| 1059 struct dict_avp_data user_name_data; | |
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1060 ret = fd_dict_search ( dict, DICT_AVP, AVP_BY_NAME, "User-Name", &avp_username, ENOENT); |
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1061 ret = fd_dict_getval ( avp_username, &user_name_data ); |
| 0 | 1062 printf("User-Name code: %d\n", user_name_data.avp_code ); |
| 1063 } | |
| 1064 | |
| 1065 */ | |
| 1066 | |
| 1067 /* | |
| 1068 *************************************************************************** | |
| 1069 * | |
| 1070 * Command object | |
| 1071 * | |
| 1072 * These types are used to manage commands objects in the dictionary | |
| 1073 * | |
| 1074 *************************************************************************** | |
| 1075 */ | |
| 1076 | |
| 1077 /* Type to hold a Diameter command code: IANA assigned values. 0x0-0x7fffff=standard, 0x800000-0xfffffd=vendors, 0xfffffe-0xffffff=experimental */ | |
| 1078 typedef uint32_t command_code_t; | |
| 1079 | |
| 1080 /* Values of command flags */ | |
| 1081 #define CMD_FLAG_REQUEST 0x80 | |
| 1082 #define CMD_FLAG_PROXIABLE 0x40 | |
| 1083 #define CMD_FLAG_ERROR 0x20 | |
| 1084 #define CMD_FLAG_RETRANSMIT 0x10 | |
| 1085 #define CMD_FLAG_RESERVED5 0x08 | |
| 1086 #define CMD_FLAG_RESERVED6 0x04 | |
| 1087 #define CMD_FLAG_RESERVED7 0x02 | |
| 1088 #define CMD_FLAG_RESERVED8 0x01 | |
| 1089 | |
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1090 /* For dumping flags and values */ |
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1091 #define DUMP_CMDFL_str "%c%c%c%c" |
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1092 #define DUMP_CMDFL_val(_val) (_val & CMD_FLAG_REQUEST)?'R':'-' , (_val & CMD_FLAG_PROXIABLE)?'P':'-' , (_val & CMD_FLAG_ERROR)?'E':'-' , (_val & CMD_FLAG_RETRANSMIT)?'T':'-' |
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1093 |
| 0 | 1094 /* Type to hold data associated to a command */ |
| 1095 struct dict_cmd_data { | |
| 1096 command_code_t cmd_code; /* code of the command */ | |
| 1097 char *cmd_name; /* Name of the command */ | |
| 1098 uint8_t cmd_flag_mask; /* Mask of fixed-value flags */ | |
| 1099 uint8_t cmd_flag_val; /* values of the fixed flags */ | |
| 1100 }; | |
| 1101 | |
| 1102 /* The criteria for searching an avp object in the dictionary */ | |
| 1103 enum { | |
| 1104 CMD_BY_NAME = 60, /* "what" points to a string */ | |
| 1105 CMD_BY_CODE_R, /* "what" points to a command_code_t. The "Request" command is returned. */ | |
| 1106 CMD_BY_CODE_A, /* "what" points to a command_code_t. The "Answer" command is returned. */ | |
| 1107 CMD_ANSWER /* "what" points to a struct dict_object of a request command. The corresponding "Answer" command is returned. */ | |
| 1108 }; | |
| 1109 | |
| 1110 | |
| 1111 /*** | |
| 1112 * API usage : | |
| 1113 | |
| 1114 The "parent" parameter of dict_new may point to an application object to inform of what application defines the command. | |
| 1115 The application associated to a command is retrieved with APPLICATION_OF_COMMAND search criteria on applications. | |
| 1116 | |
| 1117 To create the rules for children of commands, see the DICT_RULE related part. | |
| 1118 | |
| 1119 Note that the "Request" and "Answer" commands are two independant objects. This allows to have different rules for each. | |
| 1120 | |
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1121 - fd_dict_new: |
| 0 | 1122 Sample code for command creation: |
| 1123 { | |
| 1124 int ret; | |
| 1125 struct dict_object * cer; | |
| 1126 struct dict_object * cea; | |
| 1127 struct dict_cmd_data ce_data = { | |
| 1128 257, // code | |
| 1129 "Capabilities-Exchange-Request", // name | |
| 1130 CMD_FLAG_REQUEST, // mask | |
| 1131 CMD_FLAG_REQUEST // value. Only the "R" flag is constrained here, set. | |
| 1132 }; | |
| 1133 | |
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1134 ret = fd_dict_new (dict, DICT_COMMAND, &ce_data, NULL, &cer ); |
| 0 | 1135 |
| 1136 ce_data.cmd_name = "Capabilities-Exchange-Answer"; | |
| 1137 ce_data.cmd_flag_val = 0; // Same constraint on "R" flag, but this time it must be cleared. | |
| 1138 | |
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1139 ret = fd_dict_new ( dict, DICT_COMMAND, &ce_data, NULL, &cea ); |
| 0 | 1140 } |
| 1141 | |
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1142 - fd_dict_search: |
| 0 | 1143 Sample code to look for a command |
| 1144 { | |
| 1145 int ret; | |
| 1146 struct dict_object * cer, * cea; | |
| 1147 command_code_t code = 257; | |
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1148 ret = fd_dict_search ( dict, DICT_COMMAND, CMD_BY_NAME, "Capabilities-Exchange-Request", &cer, ENOENT); |
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1149 ret = fd_dict_search ( dict, DICT_COMMAND, CMD_BY_CODE_R, &code, &cer, ENOENT); |
| 0 | 1150 } |
| 1151 | |
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1152 - fd_dict_getval: |
| 0 | 1153 Sample code to retrieve the data from a command object: |
| 1154 { | |
| 1155 int ret; | |
| 1156 struct dict_object * cer; | |
| 1157 struct dict_object * cea; | |
| 1158 struct dict_cmd_data cea_data; | |
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1159 ret = fd_dict_search ( dict, DICT_COMMAND, CMD_BY_NAME, "Capabilities-Exchange-Request", &cer, ENOENT); |
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1160 ret = fd_dict_search ( dict, DICT_COMMAND, CMD_ANSWER, cer, &cea, ENOENT); |
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1161 ret = fd_dict_getval ( cea, &cea_data ); |
| 0 | 1162 printf("Answer to CER: %s\n", cea_data.cmd_name ); |
| 1163 } | |
| 1164 | |
| 1165 */ | |
| 1166 | |
| 1167 /* | |
| 1168 *************************************************************************** | |
| 1169 * | |
| 1170 * Rule object | |
| 1171 * | |
| 1172 * These objects are used to manage rules in the dictionary (ABNF implementation) | |
| 1173 * This is used for checking messages validity (more powerful than a DTD) | |
| 1174 * | |
| 1175 *************************************************************************** | |
| 1176 */ | |
| 1177 | |
| 1178 /* This defines the kind of rule that is defined */ | |
| 1179 enum rule_position { | |
| 1180 RULE_FIXED_HEAD = 1, /* The AVP must be at the head of the group. The rule_order field is used to specify the position. */ | |
| 1181 RULE_REQUIRED, /* The AVP must be present in the parent, but its position is not defined. */ | |
| 1182 RULE_OPTIONAL, /* The AVP may be present in the message. Used to specify a max number of occurences for example */ | |
| 1183 RULE_FIXED_TAIL /* The AVP must be at the end of the group. The rule_order field is used to specify the position. */ | |
| 1184 }; | |
| 1185 | |
| 1186 /* Content of a RULE object data */ | |
| 1187 struct dict_rule_data { | |
| 1188 struct dict_object *rule_avp; /* Pointer to the AVP object that is concerned by this rule */ | |
| 1189 enum rule_position rule_position; /* The position in which the rule_avp must appear in the parent */ | |
| 1190 unsigned rule_order; /* for RULE_FIXED_* rules, the place. 1,2,3.. for HEAD rules; ...,3,2,1 for TAIL rules. */ | |
| 1191 int rule_min; /* Minimum number of occurences. -1 means "default": 0 for optional rules, 1 for other rules */ | |
| 1192 int rule_max; /* Maximum number of occurences. -1 means no maximum. 0 means the AVP is forbidden. */ | |
| 1193 }; | |
| 1194 | |
| 1195 /* The criteria for searching a rule in the dictionary */ | |
| 1196 enum { | |
| 1197 RULE_BY_AVP_AND_PARENT = 70 /* "what" points to a struct dict_rule_request -- see bellow. This is used to query "what is the rule for this AVP in this group?" */ | |
| 1198 }; | |
| 1199 | |
| 1200 /* Structure for querying the dictionary about a rule */ | |
| 1201 struct dict_rule_request { | |
| 1202 struct dict_object *rule_parent; /* The grouped avp or command to which the rule apply */ | |
| 1203 struct dict_object *rule_avp; /* The AVP concerned by this rule */ | |
| 1204 }; | |
| 1205 | |
| 1206 | |
| 1207 /*** | |
| 1208 * API usage : | |
| 1209 | |
| 1210 The "parent" parameter can not be NULL. It points to the object (grouped avp or command) to which this rule apply (i.e. for which the ABNF is defined). | |
| 1211 | |
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1212 - fd_dict_new: |
| 0 | 1213 Sample code for rule creation. Let's create the Proxy-Info grouped AVP for example. |
| 1214 { | |
| 1215 int ret; | |
| 1216 struct dict_object * proxy_info_avp; | |
| 1217 struct dict_object * proxy_host_avp; | |
| 1218 struct dict_object * proxy_state_avp; | |
| 1219 struct dict_object * diameteridentity_type; | |
| 1220 struct dict_rule_data rule_data; | |
| 1221 struct dict_type_data di_type_data = { AVP_TYPE_OCTETSTRING, "DiameterIdentity", NULL, NULL }; | |
| 1222 struct dict_avp_data proxy_info_data = { 284, 0, "Proxy-Info", AVP_FLAG_VENDOR | AVP_FLAG_MANDATORY, AVP_FLAG_MANDATORY, AVP_TYPE_GROUPED }; | |
| 1223 struct dict_avp_data proxy_host_data = { 280, 0, "Proxy-Host", AVP_FLAG_VENDOR | AVP_FLAG_MANDATORY, AVP_FLAG_MANDATORY, AVP_TYPE_OCTETSTRING }; | |
| 1224 struct dict_avp_data proxy_state_data = { 33, 0, "Proxy-State",AVP_FLAG_VENDOR | AVP_FLAG_MANDATORY, AVP_FLAG_MANDATORY, AVP_TYPE_OCTETSTRING }; | |
| 1225 | |
| 1226 -- Create the parent AVP | |
|
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1227 ret = fd_dict_new ( dict, DICT_AVP, &proxy_info_data, NULL, &proxy_info_avp ); |
| 0 | 1228 |
| 1229 -- Create the first child AVP. | |
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1230 ret = fd_dict_new ( dict, DICT_TYPE, &di_type_data, NULL, &diameteridentity_type ); |
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1231 ret = fd_dict_new ( dict, DICT_AVP, &proxy_host_data, diameteridentity_type, &proxy_host_avp ); |
| 0 | 1232 |
| 1233 -- Create the other child AVP | |
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1234 ret = fd_dict_new ( dict, DICT_AVP, &proxy_state_data, NULL, &proxy_state_avp ); |
| 0 | 1235 |
| 1236 -- Now we can create the rules. Both children AVP are mandatory. | |
| 1237 rule_data.rule_position = RULE_REQUIRED; | |
| 1238 rule_data.rule_min = -1; | |
| 1239 rule_data.rule_max = -1; | |
| 1240 | |
| 1241 rule_data.rule_avp = proxy_host_avp; | |
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1242 ret = fd_dict_new ( dict, DICT_RULE, &rule_data, proxy_info_avp, NULL ); |
| 0 | 1243 |
| 1244 rule_data.rule_avp = proxy_state_avp; | |
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1245 ret = fd_dict_new ( dict, DICT_RULE, &rule_data, proxy_info_avp, NULL ); |
| 0 | 1246 } |
| 1247 | |
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1248 - fd_dict_search and fd_dict_getval are similar to previous examples. |
| 0 | 1249 |
| 1250 */ | |
| 1251 | |
| 1252 /* Define some hard-coded values */ | |
| 1253 /* Commands Codes */ | |
| 1254 #define CC_CAPABILITIES_EXCHANGE 257 | |
| 1255 #define CC_RE_AUTH 258 | |
| 1256 #define CC_ACCOUNTING 271 | |
| 1257 #define CC_ABORT_SESSION 274 | |
| 1258 #define CC_SESSION_TERMINATION 275 | |
| 1259 #define CC_DEVICE_WATCHDOG 280 | |
| 1260 #define CC_DISCONNECT_PEER 282 | |
| 1261 | |
| 1262 /* AVPs (Vendor 0) */ | |
| 1263 #define AC_PROXY_STATE 33 | |
| 1264 #define AC_HOST_IP_ADDRESS 257 | |
| 1265 #define AC_AUTH_APPLICATION_ID 258 | |
| 1266 #define AC_ACCT_APPLICATION_ID 259 | |
| 1267 #define AC_VENDOR_SPECIFIC_APPLICATION_ID 260 | |
| 1268 #define AC_REDIRECT_HOST_USAGE 261 | |
| 1269 #define AC_REDIRECT_MAX_CACHE_TIME 262 | |
| 1270 #define AC_SESSION_ID 263 | |
| 1271 #define AC_ORIGIN_HOST 264 | |
| 1272 #define AC_SUPPORTED_VENDOR_ID 265 | |
| 1273 #define AC_VENDOR_ID 266 | |
| 1274 #define AC_FIRMWARE_REVISION 267 | |
| 1275 #define AC_RESULT_CODE 268 | |
| 1276 #define AC_PRODUCT_NAME 269 | |
| 1277 #define AC_DISCONNECT_CAUSE 273 | |
| 1278 #define ACV_DC_REBOOTING 0 | |
| 1279 #define ACV_DC_BUSY 1 | |
| 1280 #define ACV_DC_NOT_FRIEND 2 | |
| 1281 #define AC_ORIGIN_STATE_ID 278 | |
| 1282 #define AC_FAILED_AVP 279 | |
| 1283 #define AC_PROXY_HOST 280 | |
| 1284 #define AC_ERROR_MESSAGE 281 | |
| 1285 #define AC_ROUTE_RECORD 282 | |
| 1286 #define AC_DESTINATION_REALM 283 | |
| 1287 #define AC_PROXY_INFO 284 | |
| 1288 #define AC_REDIRECT_HOST 292 | |
| 1289 #define AC_DESTINATION_HOST 293 | |
| 1290 #define AC_ERROR_REPORTING_HOST 294 | |
| 1291 #define AC_ORIGIN_REALM 296 | |
| 1292 #define AC_INBAND_SECURITY_ID 299 | |
| 1293 | |
| 1294 /* Error codes */ | |
| 1295 #define ER_DIAMETER_SUCCESS 2001 | |
| 1296 #define ER_DIAMETER_REALM_NOT_SERVED 3003 | |
| 1297 #define ER_DIAMETER_TOO_BUSY 3004 | |
| 1298 #define ER_DIAMETER_REDIRECT_INDICATION 3006 | |
| 1299 | |
|
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1300 |
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1301 /*============================================================*/ |
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1302 /* SESSIONS */ |
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1303 /*============================================================*/ |
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1304 |
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1305 /* Modules that want to associate a state with a Session-Id must first register a handler of this type */ |
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1306 struct session_handler; |
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1307 |
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1308 /* This opaque structure represents a session associated with a Session-Id */ |
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1309 struct session; |
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1310 |
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1311 /* The state information that a module associate with a session -- each module define its own data format */ |
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1312 typedef void session_state; |
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1313 |
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1314 /* |
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1315 * FUNCTION: fd_sess_handler_create |
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1316 * |
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1317 * PARAMETERS: |
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1318 * handler : location where the new handler must be stored. |
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1319 * cleanup : a callback function that must be called when the session with associated data is destroyed. |
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1320 * |
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1321 * DESCRIPTION: |
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1322 * Create a new session handler. This is needed by a module to associate a state with a session object. |
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1323 * The cleanup handler is called when the session timeout expires, or fd_sess_destroy is called. It must free |
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1324 * the state associated with the session, and eventually trig other actions (send a STR, ...). |
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1325 * |
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1326 * RETURN VALUE: |
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1327 * 0 : The new handler has been created. |
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1328 * EINVAL : A parameter is invalid. |
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1329 * ENOMEM : Not enough memory to complete the operation |
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1330 */ |
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1331 int fd_sess_handler_create_internal ( struct session_handler ** handler, void (*cleanup)(char * sid, session_state * state) ); |
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1332 /* Macro to avoid casting everywhere */ |
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1333 #define fd_sess_handler_create( _handler, _cleanup ) \ |
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1334 fd_sess_handler_create_internal( (_handler), (void (*)(char *, session_state *))(_cleanup) ) |
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1335 |
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1336 /* |
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1337 * FUNCTION: fd_sess_handler_destroy |
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1338 * |
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1339 * PARAMETERS: |
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1340 * handler : location of an handler created by fd_sess_handler_create. |
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1341 * |
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1342 * DESCRIPTION: |
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1343 * This destroys a session handler (typically called when an application is shutting down). |
|
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1344 * If sessions states are registered with this handler, the cleanup callback is called on them. |
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1345 * |
|
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1346 * RETURN VALUE: |
|
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1347 * 0 : The handler was destroyed. |
|
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1348 * EINVAL : A parameter is invalid. |
|
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1349 * ENOMEM : Not enough memory to complete the operation |
|
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1350 */ |
|
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1351 int fd_sess_handler_destroy ( struct session_handler ** handler ); |
|
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1352 |
|
2
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1353 |
|
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|
1354 |
|
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1355 /* |
|
3
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1356 * FUNCTION: fd_sess_new |
|
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1357 * |
|
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1358 * PARAMETERS: |
|
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1359 * session : The location where the session object will be created upon success. |
|
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1360 * diamId : \0-terminated string containing a Diameter Identity. |
|
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1361 * opt : Additional string. Usage is described bellow. |
|
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1362 * optlen : if opt is \0-terminated, this can be 0. Otherwise, the length of opt. |
|
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1363 * |
|
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1364 * DESCRIPTION: |
|
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1365 * Create a new session object. The Session-Id string associated with this session is generated as follow: |
|
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1366 * If diamId parameter is provided, the string is created according to the RFC: <diamId>;<high32>;<low32>[;opt] where |
|
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1367 * diamId is a Diameter Identity. |
|
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1368 * high32 and low32 are the parts of a monotonic 64 bits counter initialized to (time, 0) at startup. |
|
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1369 * opt is an optional string that can be concatenated to the identifier. |
|
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1370 * If diamId is NULL, the string is exactly the content of opt. |
|
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1371 * |
|
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1372 * RETURN VALUE: |
|
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1373 * 0 : The session is created. |
|
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1374 * EINVAL : A parameter is invalid. |
|
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1375 * EALREADY : A session with the same name already exists (returned in *session) |
|
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1376 * ENOMEM : Not enough memory to complete the operation |
|
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|
1377 */ |
|
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1378 int fd_sess_new ( struct session ** session, char * diamId, char * opt, size_t optlen ); |
|
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1379 |
|
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1380 /* |
|
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1381 * FUNCTION: fd_sess_fromsid |
|
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1382 * |
|
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1383 * PARAMETERS: |
|
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1384 * sid : pointer to a string containing a Session-Id (UTF-8). |
|
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1385 * len : length of the sid string (which does not need to be '\0'-terminated) |
|
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1386 * session : On success, pointer to the session object created / retrieved. |
|
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1387 * new : if not NULL, set to 1 on return if the session object has been created, 0 if it was simply retrieved. |
|
2
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1388 * |
|
3
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1389 * DESCRIPTION: |
|
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1390 * Retrieve a session object from a Session-Id string. Calling this function makes an implicit call to the |
|
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1391 * fd_sess_link function on the returned session. In case no session object was previously existing with this |
|
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1392 * id, a new object is silently created (equivalent to fd_sess_new with flag SESSION_NEW_FULL). |
|
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1393 * |
|
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1394 * RETURN VALUE: |
|
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1395 * 0 : The session parameter has been updated. |
|
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1396 * EINVAL : A parameter is invalid. |
|
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1397 * ENOMEM : Not enough memory to complete the operation |
|
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|
1398 */ |
|
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1399 int fd_sess_fromsid ( char * sid, size_t len, struct session ** session, int * new); |
|
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1400 |
|
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|
1401 /* |
|
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1402 * FUNCTION: fd_sess_getsid |
|
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1403 * |
|
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1404 * PARAMETERS: |
|
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1405 * session : Pointer to a session object. |
|
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1406 * sid : On success, the location of a (\0-terminated) string is stored here. |
|
2
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1407 * |
|
3
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|
1408 * DESCRIPTION: |
|
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1409 * Retrieve the session identifier (Session-Id) corresponding to a session object. |
|
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1410 * The returned sid is an UTF-8 string terminated by \0, suitable for calls to strlen and strcpy. |
|
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|
1411 * It may be used for example to set the value of an AVP. |
|
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1412 * Note that the sid string is not copied, just its reference... do not free it! |
|
2
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1413 * |
|
3
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1414 * RETURN VALUE: |
|
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1415 * 0 : The sid parameter has been updated. |
|
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1416 * EINVAL : A parameter is invalid. |
|
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1417 */ |
|
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|
1418 int fd_sess_getsid ( struct session * session, char ** sid ); |
|
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1419 |
|
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1420 /* |
|
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1421 * FUNCTION: fd_sess_settimeout |
|
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1422 * |
|
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1423 * PARAMETERS: |
|
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1424 * session : The session for which to set the timeout. |
|
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1425 * timeout : The date when the session times out. |
|
2
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1426 * |
|
3
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1427 * DESCRIPTION: |
|
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1428 * Set the lifetime for a given session object. This function may be |
|
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1429 * called several times on the same object to update the timeout value. |
|
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1430 * When the timeout date is reached, the cleanup handler of each |
|
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1431 * module that registered data with this session is called, then the |
|
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1432 * session is cleared. |
|
2
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1433 * |
|
3
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1434 * There is a possible race condition between cleanup of the session |
|
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1435 * and use of its data; applications should ensure that they are not |
|
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1436 * using data from a session that is about to expire / expired. |
|
2
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|
1437 * |
|
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1438 * RETURN VALUE: |
|
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|
1439 * 0 : The session timeout has been updated. |
|
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1440 * EINVAL : A parameter is invalid. |
|
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|
1441 */ |
|
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|
1442 int fd_sess_settimeout( struct session * session, const struct timespec * timeout ); |
|
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1443 |
|
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|
1444 /* |
|
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|
1445 * FUNCTION: fd_sess_destroy |
|
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1446 * |
|
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|
1447 * PARAMETERS: |
|
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1448 * session : Pointer to a session object. |
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1449 * |
|
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1450 * DESCRIPTION: |
|
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1451 * Destroys a session an all associated data, if any. |
|
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1452 * Equivalent to a session timeout expired, but the effect is immediate. |
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1453 * |
|
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1454 * RETURN VALUE: |
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1455 * 0 : The session no longer exists. |
|
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1456 * EINVAL : A parameter is invalid. |
|
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1457 */ |
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1458 int fd_sess_destroy ( struct session ** session ); |
|
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1459 |
|
6
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1460 /* |
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1461 * FUNCTION: fd_sess_reclaim |
|
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1462 * |
|
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1463 * PARAMETERS: |
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1464 * session : Pointer to a session object. |
|
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1465 * |
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1466 * DESCRIPTION: |
|
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1467 * Destroys the resources of a session, only if no session_state is associated with it. |
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1468 * |
|
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1469 * RETURN VALUE: |
|
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1470 * 0 : The session no longer exists. |
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1471 * EINVAL : A parameter is invalid. |
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1472 */ |
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1473 int fd_sess_reclaim ( struct session ** session ); |
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1474 |
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1475 |
|
3
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1476 |
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1477 |
|
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1478 /* |
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1479 * FUNCTION: fd_sess_state_store |
|
2
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1480 * |
|
3
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1481 * PARAMETERS: |
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1482 * handler : The handler with which the state is registered. |
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1483 * session : The session object with which the state is registered. |
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1484 * state : An application state (opaque data) to store with the session. |
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1485 * |
|
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1486 * DESCRIPTION: |
|
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1487 * Stores an application state with a session. This state can later be retrieved |
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1488 * with fd_sess_state_retrieve, or implicitly in the cleanup handler when the session |
|
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1489 * is destroyed. |
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1490 * |
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1491 * RETURN VALUE: |
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1492 * 0 : The state has been stored. |
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1493 * EINVAL : A parameter is invalid. |
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1494 * EALREADY : Data was already associated with this session and client. |
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1495 * ENOMEM : Not enough memory to complete the operation |
|
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1496 */ |
|
6
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1497 int fd_sess_state_store_internal ( struct session_handler * handler, struct session * session, session_state ** state ); |
|
5
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1498 #define fd_sess_state_store( _handler, _session, _state ) \ |
|
6
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1499 fd_sess_state_store_internal( (_handler), (_session), (void *)(_state) ) |
|
3
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1500 |
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1501 /* |
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1502 * FUNCTION: fd_sess_state_retrieve |
|
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1503 * |
|
3
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1504 * PARAMETERS: |
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1505 * handler : The handler with which the state was registered. |
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1506 * session : The session object with which the state was registered. |
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1507 * state : Location where the state must be saved if it is found. |
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1508 * |
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1509 * DESCRIPTION: |
|
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1510 * Retrieves a state saved by fd_sess_state_store. |
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1511 * After this function has been called, the state is no longer associated with |
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1512 * the session. A new call to fd_sess_state_store must be performed in order to |
|
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1513 * store again the data with the session. |
|
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1514 * |
|
3
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1515 * RETURN VALUE: |
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1516 * 0 : *state is updated (NULL or points to the state if it was found). |
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1517 * EINVAL : A parameter is invalid. |
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1518 */ |
|
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1519 int fd_sess_state_retrieve_internal ( struct session_handler * handler, struct session * session, session_state ** state ); |
|
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1520 #define fd_sess_state_retrieve( _handler, _session, _state ) \ |
|
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1521 fd_sess_state_retrieve_internal( (_handler), (_session), (void *)(_state) ) |
|
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1522 |
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1523 |
|
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1524 /* For debug */ |
|
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1525 void fd_sess_dump(int level, struct session * session); |
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1526 void fd_sess_dump_hdl(int level, struct session_handler * handler); |
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1527 |
|
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1528 |
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1529 /*============================================================*/ |
| 0 | 1530 /* MESSAGES */ |
| 1531 /*============================================================*/ | |
| 1532 | |
| 1533 /* The following types are opaque */ | |
| 1534 struct msg; /* A message: command with children AVPs (possibly grand children) */ | |
| 1535 struct avp; /* AVP object */ | |
| 1536 | |
| 1537 /* Some details about chaining: | |
| 1538 * | |
| 1539 * A message is made of a header ( msg ) and 0 or more AVPs ( avp ). | |
| 1540 * The structure is a kind of tree, where some AVPs (grouped AVPs) can contain other AVPs. | |
| 1541 * Exemple: | |
| 1542 * msg | |
| 1543 * |-avp | |
| 1544 * |-gavp | |
| 1545 * | |-avp | |
| 1546 * | |-avp | |
| 1547 * | \-avp | |
| 1548 * |-avp | |
| 1549 * \-avp | |
| 1550 * | |
| 1551 */ | |
| 1552 | |
| 1553 /* The following type is used to point to either a msg or an AVP */ | |
| 1554 typedef void msg_or_avp; | |
| 1555 | |
| 1556 /* The Diameter protocol version */ | |
| 1557 #define DIAMETER_VERSION 1 | |
| 1558 | |
| 1559 /* In the two following types, some fields are marked (READONLY). | |
| 1560 * This means that the content of these fields will be overwritten by the daemon so modifying it is useless. | |
| 1561 */ | |
| 1562 | |
| 1563 /* The following structure represents the header of a message. All data is in host byte order. */ | |
| 1564 struct msg_hdr { | |
| 1565 uint8_t msg_version; /* (READONLY) Version of Diameter: must be DIAMETER_VERSION. */ | |
| 1566 uint32_t msg_length; /* (READONLY)(3 bytes) indicates the length of the message */ | |
| 1567 uint8_t msg_flags; /* Message flags: CMD_FLAG_* */ | |
| 1568 command_code_t msg_code; /* (3 bytes) the command-code. See dictionary-api.h for more detail */ | |
| 1569 application_id_t msg_appl; /* The application issuing this message */ | |
| 1570 uint32_t msg_hbhid; /* The Hop-by-Hop identifier of the message */ | |
| 1571 uint32_t msg_eteid; /* The End-to-End identifier of the message */ | |
| 1572 }; | |
| 1573 | |
| 1574 /* The following structure represents the visible content of an AVP. All data is in host byte order. */ | |
| 1575 struct avp_hdr { | |
| 1576 avp_code_t avp_code; /* the AVP Code */ | |
| 1577 uint8_t avp_flags; /* AVP_FLAG_* flags */ | |
| 1578 uint32_t avp_len; /* (READONLY)(Only 3 bytes are used) the length of the AVP as described in the RFC */ | |
| 1579 vendor_id_t avp_vendor; /* Only used if AVP_FLAG_VENDOR is present */ | |
| 1580 union avp_value *avp_value; /* pointer to the value of the AVP. NULL means that the value is not set / not understood. | |
| 1581 One should not directly change this value. Use the msg_avp_setvalue function instead. | |
| 1582 The content of the pointed structure can be changed directly, with this restriction: | |
| 1583 if the AVP is an OctetString, and you change the value of the pointer avp_value->os.data, then | |
| 1584 you must call free() on the previous value, and the new one must be free()-able. | |
| 1585 */ | |
| 1586 }; | |
| 1587 | |
| 1588 /* The following enum is used to browse inside message hierarchy (msg, gavp, avp) */ | |
| 1589 enum msg_brw_dir { | |
| 1590 MSG_BRW_NEXT = 1, /* Get the next element at the same level, or NULL if this is the last element. */ | |
| 1591 MSG_BRW_PREV, /* Get the previous element at the same level, or NULL if this is the first element. */ | |
| 1592 MSG_BRW_FIRST_CHILD, /* Get the first child AVP of this element, if any. */ | |
| 1593 MSG_BRW_LAST_CHILD, /* Get the last child AVP of this element, if any. */ | |
| 1594 MSG_BRW_PARENT, /* Get the parent element of this element, if any. Only the msg_t object has no parent. */ | |
| 1595 MSG_BRW_WALK /* This is equivalent to FIRST_CHILD or NEXT or PARENT->next, first that is not NULL. Use this to walk inside all AVPs. */ | |
| 1596 }; | |
| 1597 | |
| 1598 /* Some flags used in the functions bellow */ | |
| 1599 #define MSGFL_ALLOC_ETEID 0x01 /* When creating a message, a new end-to-end ID is allocated and set in the message */ | |
| 1600 #define MSGFL_ANSW_ERROR 0x02 /* When creating an answer message, set the 'E' bit and use the generic error ABNF instead of command-specific ABNF */ | |
| 1601 #define MSGFL_MAX MSGFL_ANSW_ERROR /* The biggest valid flag value */ | |
| 1602 | |
| 1603 /**************************************************/ | |
| 1604 /* Message creation, manipulation, disposal */ | |
| 1605 /**************************************************/ | |
| 1606 /* | |
| 1607 * FUNCTION: fd_msg_avp_new | |
| 1608 * | |
| 1609 * PARAMETERS: | |
| 1610 * model : Pointer to a DICT_AVP dictionary object describing the avp to create, or NULL. | |
| 1611 * flags : Flags to use in creation (not used yet, should be 0). | |
| 1612 * avp : Upon success, pointer to the new avp is stored here. | |
| 1613 * | |
| 1614 * DESCRIPTION: | |
| 1615 * Create a new AVP instance. | |
| 1616 * | |
| 1617 * RETURN VALUE: | |
| 1618 * 0 : The AVP is created. | |
| 1619 * EINVAL : A parameter is invalid. | |
| 1620 * (other standard errors may be returned, too, with their standard meaning. Example: | |
| 1621 * ENOMEM : Memory allocation for the new avp failed.) | |
| 1622 */ | |
| 1623 int fd_msg_avp_new ( struct dict_object * model, int flags, struct avp ** avp ); | |
| 1624 | |
| 1625 /* | |
| 1626 * FUNCTION: fd_msg_new | |
| 1627 * | |
| 1628 * PARAMETERS: | |
| 1629 * model : Pointer to a DICT_COMMAND dictionary object describing the message to create, or NULL. | |
| 1630 * flags : combination of MSGFL_* flags. | |
| 1631 * msg : Upon success, pointer to the new message is stored here. | |
| 1632 * | |
| 1633 * DESCRIPTION: | |
| 1634 * Create a new empty Diameter message. | |
| 1635 * | |
| 1636 * RETURN VALUE: | |
| 1637 * 0 : The message is created. | |
| 1638 * EINVAL : A parameter is invalid. | |
| 1639 * (other standard errors may be returned, too, with their standard meaning. Example: | |
| 1640 * ENOMEM : Memory allocation for the new message failed.) | |
| 1641 */ | |
| 1642 int fd_msg_new ( struct dict_object * model, int flags, struct msg ** msg ); | |
| 1643 | |
| 1644 /* | |
| 1645 * FUNCTION: msg_new_answer_from_req | |
| 1646 * | |
| 1647 * PARAMETERS: | |
| 1648 * dict : Pointer to the dictionary containing the model of the query. | |
| 1649 * msg : The location of the query on function call. Updated by the location of answer message on return. | |
| 1650 * flag : Pass MSGFL_ANSW_ERROR to indicate if the answer is an error message (will set the 'E' bit) | |
| 1651 * | |
| 1652 * DESCRIPTION: | |
| 1653 * This function creates the empty answer message corresponding to a request. | |
| 1654 * The header is set properly (R flag, ccode, appid, hbhid, eteid) | |
| 1655 * The Session-Id AVP is copied if present. | |
| 1656 * The calling code should usually call fd_msg_rescode_set function on the answer. | |
| 1657 * Upon return, the original query may be retrieved by calling fd_msg_answ_getq on the message. | |
| 1658 * | |
| 1659 * RETURN VALUE: | |
| 1660 * 0 : Operation complete. | |
| 1661 * !0 : an error occurred. | |
| 1662 */ | |
| 1663 int fd_msg_new_answer_from_req ( struct dictionary * dict, struct msg ** msg, int flag ); | |
| 1664 | |
| 1665 /* | |
| 1666 * FUNCTION: fd_msg_browse | |
| 1667 * | |
| 1668 * PARAMETERS: | |
| 1669 * reference : Pointer to a struct msg or struct avp. | |
| 1670 * dir : Direction for browsing | |
| 1671 * found : If not NULL, updated with the element that has been found, if any, or NULL if no element was found / an error occurred. | |
| 1672 * depth : If not NULL, points to an integer representing the "depth" of this object in the tree. This is a relative value, updated on return. | |
| 1673 * | |
| 1674 * DESCRIPTION: | |
| 1675 * Explore the content of a message object (hierarchy). If "found" is null, only error checking is performed. | |
| 1676 * If "depth" is provided, it is updated as follow on successful function return: | |
| 1677 * - not modified for MSG_BRW_NEXT and MSG_BRW_PREV. | |
| 1678 * - *depth = *depth + 1 for MSG_BRW_FIRST_CHILD and MSG_BRW_LAST_CHILD. | |
| 1679 * - *depth = *depth - 1 for MSG_BRW_PARENT. | |
| 1680 * - *depth = *depth + X for MSG_BRW_WALK, with X between 1 (returned the 1st child) and -N (returned the Nth parent's next). | |
| 1681 * | |
| 1682 * RETURN VALUE: | |
| 1683 * 0 : found has been updated (if non NULL). | |
| 1684 * EINVAL : A parameter is invalid. | |
| 1685 * ENOENT : No element has been found where requested, and "found" was NULL (otherwise, *found is set to NULL and 0 is returned). | |
| 1686 */ | |
| 1687 int fd_msg_browse_internal ( msg_or_avp * reference, enum msg_brw_dir dir, msg_or_avp ** found, int * depth ); | |
| 1688 /* Macro to avoid having to cast the third parameter everywhere */ | |
| 1689 #define fd_msg_browse( ref, dir, found, depth ) \ | |
| 1690 fd_msg_browse_internal( (ref), (dir), (void *)(found), (depth) ) | |
| 1691 | |
| 1692 | |
| 1693 /* | |
| 1694 * FUNCTION: fd_msg_avp_add | |
| 1695 * | |
| 1696 * PARAMETERS: | |
| 1697 * reference : Pointer to a valid msg or avp. | |
| 1698 * dir : location where the new AVP should be inserted, relative to the reference. MSG_BRW_PARENT and MSG_BRW_WALK are not valid. | |
| 1699 * avp : pointer to the AVP object that must be inserted. | |
| 1700 * | |
| 1701 * DESCRIPTION: | |
| 1702 * Adds an AVP into an object that can contain it: grouped AVP or message. | |
| 1703 * | |
| 1704 * RETURN VALUE: | |
| 1705 * 0 : The AVP has been added. | |
| 1706 * EINVAL : A parameter is invalid. | |
| 1707 */ | |
| 1708 int fd_msg_avp_add ( msg_or_avp * reference, enum msg_brw_dir dir, struct avp *avp); | |
| 1709 | |
| 1710 /* | |
| 1711 * FUNCTION: fd_msg_search_avp | |
| 1712 * | |
| 1713 * PARAMETERS: | |
| 1714 * msg : The message structure in which to search the AVP. | |
| 1715 * what : The dictionary model of the AVP to search. | |
| 1716 * avp : location where the AVP reference is stored if found. | |
| 1717 * | |
| 1718 * DESCRIPTION: | |
| 1719 * Search the first top-level AVP of a given model inside a message. | |
| 1720 * Note: only the first instance of the AVP is returned by this function. | |
| 1721 * Note: only top-level AVPs are searched, not inside grouped AVPs. | |
| 1722 * Use msg_browse if you need more advanced research features. | |
| 1723 * | |
| 1724 * RETURN VALUE: | |
| 1725 * 0 : The AVP has been found. | |
| 1726 * EINVAL : A parameter is invalid. | |
| 1727 * ENOENT : No AVP has been found, and "avp" was NULL (otherwise, *avp is set to NULL and 0 returned). | |
| 1728 */ | |
| 1729 int fd_msg_search_avp ( struct msg * msg, struct dict_object * what, struct avp ** avp ); | |
| 1730 | |
| 1731 /* | |
| 1732 * FUNCTION: fd_msg_free | |
| 1733 * | |
| 1734 * PARAMETERS: | |
| 1735 * object : pointer to the message or AVP object that must be unlinked and freed. | |
| 1736 * | |
| 1737 * DESCRIPTION: | |
| 1738 * Unlink and free a message or AVP object and its children. | |
| 1739 * If the object is an AVP linked into a message, the AVP is removed before being freed. | |
| 1740 * | |
| 1741 * RETURN VALUE: | |
| 1742 * 0 : The message has been freed. | |
| 1743 * EINVAL : A parameter is invalid. | |
| 1744 */ | |
| 1745 int fd_msg_free ( msg_or_avp * object ); | |
| 1746 | |
| 1747 /***************************************/ | |
| 1748 /* Dump functions */ | |
| 1749 /***************************************/ | |
| 1750 /* | |
| 1751 * FUNCTION: fd_msg_dump_* | |
| 1752 * | |
| 1753 * PARAMETERS: | |
| 1754 * level : the log level (INFO, FULL, ...) at which the object is dumped | |
| 1755 * obj : A msg or avp object. | |
| 1756 * | |
| 1757 * DESCRIPTION: | |
| 1758 * These functions dump the content of a message to the debug log | |
| 1759 * either recursively or only the object itself. | |
| 1760 * | |
| 1761 * RETURN VALUE: | |
| 1762 * - | |
| 1763 */ | |
| 1764 void fd_msg_dump_walk ( int level, msg_or_avp *obj ); | |
| 1765 void fd_msg_dump_one ( int level, msg_or_avp *obj ); | |
| 1766 | |
| 1767 | |
| 1768 /*********************************************/ | |
| 1769 /* Message metadata management functions */ | |
| 1770 /*********************************************/ | |
| 1771 /* | |
| 1772 * FUNCTION: fd_msg_model | |
| 1773 * | |
| 1774 * PARAMETERS: | |
| 1775 * reference : Pointer to a valid msg or avp. | |
| 1776 * model : on success, pointer to the dictionary model of this command or AVP. NULL if the model is unknown. | |
| 1777 * | |
| 1778 * DESCRIPTION: | |
| 1779 * Retrieve the dictionary object describing this message or avp. If the object is unknown or the fd_msg_parse_dict has not been called, | |
| 1780 * *model is set to NULL. | |
| 1781 * | |
| 1782 * RETURN VALUE: | |
| 1783 * 0 : The model has been set. | |
| 1784 * EINVAL : A parameter is invalid. | |
| 1785 */ | |
| 1786 int fd_msg_model ( msg_or_avp * reference, struct dict_object ** model ); | |
| 1787 | |
| 1788 /* | |
| 1789 * FUNCTION: fd_msg_hdr | |
| 1790 * | |
| 1791 * PARAMETERS: | |
| 1792 * msg : Pointer to a valid message object. | |
| 1793 * pdata : Upon success, pointer to the msg_hdr structure of this message. The fields may be modified. | |
| 1794 * | |
| 1795 * DESCRIPTION: | |
| 1796 * Retrieve location of modifiable section of a message. | |
| 1797 * | |
| 1798 * RETURN VALUE: | |
| 1799 * 0 : The location has been written. | |
| 1800 * EINVAL : A parameter is invalid. | |
| 1801 */ | |
| 1802 int fd_msg_hdr ( struct msg *msg, struct msg_hdr **pdata ); | |
| 1803 | |
| 1804 /* | |
| 1805 * FUNCTION: fd_msg_avp_hdr | |
| 1806 * | |
| 1807 * PARAMETERS: | |
| 1808 * avp : Pointer to a valid avp object. | |
| 1809 * pdata : Upon success, pointer to the avp_hdr structure of this avp. The fields may be modified. | |
| 1810 * | |
| 1811 * DESCRIPTION: | |
| 1812 * Retrieve location of modifiable data of an avp. | |
| 1813 * | |
| 1814 * RETURN VALUE: | |
| 1815 * 0 : The location has been written. | |
| 1816 * EINVAL : A parameter is invalid. | |
| 1817 */ | |
| 1818 int fd_msg_avp_hdr ( struct avp *avp, struct avp_hdr **pdata ); | |
| 1819 | |
| 1820 /* | |
| 1821 * FUNCTION: fd_msg_answ_associate, fd_msg_answ_getq, fd_msg_answ_detach | |
| 1822 * | |
| 1823 * PARAMETERS: | |
| 1824 * answer : the received answer message | |
| 1825 * query : the corresponding query that had been sent | |
| 1826 * | |
| 1827 * DESCRIPTION: | |
| 1828 * fd_msg_answ_associate associates a query msg with the received answer. | |
| 1829 * Query is retrieved with fd_msg_answ_getq. | |
| 1830 * If answer message is freed, the query is also freed. | |
| 1831 * If the msg_answ_detach function is called, the association is removed. | |
| 1832 * This is meant to be called from the daemon only. | |
| 1833 * | |
| 1834 * RETURN VALUE: | |
| 1835 * 0 : ok | |
| 1836 * EINVAL: a parameter is invalid | |
| 1837 */ | |
| 1838 int fd_msg_answ_associate( struct msg * answer, struct msg * query ); | |
| 1839 int fd_msg_answ_getq ( struct msg * answer, struct msg ** query ); | |
| 1840 int fd_msg_answ_detach ( struct msg * answer ); | |
| 1841 | |
| 1842 /* | |
| 1843 * FUNCTION: fd_msg_anscb_associate, fd_msg_anscb_get | |
| 1844 * | |
| 1845 * PARAMETERS: | |
| 1846 * msg : the answer message | |
| 1847 * anscb : the callback to associate with the message | |
| 1848 * data : the data to pass to the callback | |
| 1849 * | |
| 1850 * DESCRIPTION: | |
| 1851 * Associate or retrieve a callback with an answer message. | |
| 1852 * This is meant to be called from the daemon only. | |
| 1853 * | |
| 1854 * RETURN VALUE: | |
| 1855 * 0 : ok | |
| 1856 * EINVAL: a parameter is invalid | |
| 1857 */ | |
| 1858 int fd_msg_anscb_associate( struct msg * msg, void ( *anscb)(void *, struct msg **), void * data ); | |
| 1859 int fd_msg_anscb_get ( struct msg * msg, void (**anscb)(void *, struct msg **), void ** data ); | |
| 1860 | |
| 1861 /* | |
| 1862 * FUNCTION: fd_msg_rt_associate, fd_msg_rt_get | |
| 1863 * | |
| 1864 * PARAMETERS: | |
| 1865 * msg : the query message to be sent | |
| 1866 * list : the ordered list of possible next-peers | |
| 1867 * | |
| 1868 * DESCRIPTION: | |
| 1869 * Associate a routing list with a query, and retrieve it. | |
| 1870 * If the message is freed, the list is also freed. | |
| 1871 * | |
| 1872 * RETURN VALUE: | |
| 1873 * 0 : ok | |
| 1874 * EINVAL: a parameter is invalid | |
| 1875 */ | |
| 1876 int fd_msg_rt_associate( struct msg * msg, struct fd_list ** list ); | |
| 1877 int fd_msg_rt_get ( struct msg * msg, struct fd_list ** list ); | |
| 1878 | |
| 1879 /* | |
| 1880 * FUNCTION: fd_msg_is_routable | |
| 1881 * | |
| 1882 * PARAMETERS: | |
| 1883 * msg : A msg object. | |
| 1884 * | |
| 1885 * DESCRIPTION: | |
| 1886 * This function returns a boolean telling if a given message is routable in the Diameter network, | |
| 1887 * or if it is a local link message only (ex: CER/CEA, DWR/DWA, ...). | |
| 1888 * | |
| 1889 * RETURN VALUE: | |
| 1890 * 0 : The message is not routable / an error occurred. | |
| 1891 * 1 : The message is routable. | |
| 1892 */ | |
| 1893 int fd_msg_is_routable ( struct msg * msg ); | |
| 1894 | |
| 1895 /* | |
| 1896 * FUNCTION: fd_msg_source_(g/s)et | |
| 1897 * | |
| 1898 * PARAMETERS: | |
| 1899 * msg : A msg object. | |
| 1900 * diamid : The diameter id of the peer from which this message was received. | |
| 1901 * hash : The hash for the diamid value. | |
| 1902 * add_rr : if true, a Route-Record AVP is added to the message with content diamid. In that case, dict must be supplied. | |
| 1903 * dict : a dictionary with definition of Route-Record AVP (if add_rr is true) | |
| 1904 * | |
| 1905 * DESCRIPTION: | |
| 1906 * Store or retrieve the diameted id of the peer from which this message was received. | |
| 1907 * Will be used for example by the routing module to add the Route-Record AVP in forwarded requests, | |
| 1908 * or to direct answers to the appropriate peer. | |
| 1909 * | |
| 1910 * RETURN VALUE: | |
| 1911 * 0 : Operation complete. | |
| 1912 * !0 : an error occurred. | |
| 1913 */ | |
| 1914 int fd_msg_source_set( struct msg * msg, char * diamid, uint32_t hash, int add_rr, struct dictionary * dict ); | |
| 1915 int fd_msg_source_get( struct msg * msg, char ** diamid, uint32_t *hash ); | |
| 1916 | |
| 1917 /* | |
| 1918 * FUNCTION: fd_msg_eteid_get | |
| 1919 * | |
| 1920 * PARAMETERS: | |
| 1921 * - | |
| 1922 * | |
| 1923 * DESCRIPTION: | |
| 1924 * Get a new unique end-to-end id value for the local peer. | |
| 1925 * | |
| 1926 * RETURN VALUE: | |
| 1927 * The new assigned value. No error code is defined. | |
| 1928 */ | |
| 1929 uint32_t fd_msg_eteid_get ( void ); | |
| 1930 | |
| 1931 | |
| 1932 /***************************************/ | |
| 1933 /* Manage AVP values */ | |
| 1934 /***************************************/ | |
| 1935 | |
| 1936 /* | |
| 1937 * FUNCTION: fd_msg_avp_setvalue | |
| 1938 * | |
| 1939 * PARAMETERS: | |
| 1940 * avp : Pointer to a valid avp object with a NULL avp_value pointer. The model must be known. | |
| 1941 * value : pointer to an avp_value. The content will be COPIED into the internal storage area. | |
| 1942 * If data type is an octetstring, the data is also copied. | |
| 1943 * If value is a NULL pointer, the previous data is erased and value is unset in the AVP. | |
| 1944 * | |
| 1945 * DESCRIPTION: | |
| 1946 * Initialize the avp_value field of an AVP header. | |
| 1947 * | |
| 1948 * RETURN VALUE: | |
| 1949 * 0 : The avp_value pointer has been set. | |
| 1950 * EINVAL : A parameter is invalid. | |
| 1951 */ | |
| 1952 int fd_msg_avp_setvalue ( struct avp *avp, union avp_value *value ); | |
| 1953 | |
| 1954 /* | |
| 1955 * FUNCTION: fd_msg_avp_value_encode | |
| 1956 * | |
| 1957 * PARAMETERS: | |
| 1958 * avp : Pointer to a valid avp object with a NULL avp_value. The model must be known. | |
| 1959 * data : Pointer to the data that must be encoded as AVP value and stored in the AVP. | |
| 1960 * This is only valid for AVPs of derived type for which type_data_encode callback is set. (ex: Address type) | |
| 1961 * | |
| 1962 * DESCRIPTION: | |
| 1963 * Initialize the avp_value field of an AVP object from formatted data, using the AVP's type "type_data_encode" callback. | |
| 1964 * | |
| 1965 * RETURN VALUE: | |
| 1966 * 0 : The avp_value has been set. | |
| 1967 * EINVAL : A parameter is invalid. | |
| 1968 * ENOTSUP : There is no appropriate callback registered with this AVP's type. | |
| 1969 */ | |
| 1970 int fd_msg_avp_value_encode ( void *data, struct avp *avp ); | |
| 1971 | |
| 1972 /* | |
| 1973 * FUNCTION: fd_msg_avp_value_interpret | |
| 1974 * | |
| 1975 * PARAMETERS: | |
| 1976 * avp : Pointer to a valid avp object with a non-NULL avp_value value. | |
| 1977 * data : Upon success, formatted interpretation of the AVP value is stored here. | |
| 1978 * | |
| 1979 * DESCRIPTION: | |
| 1980 * Interpret the content of an AVP of Derived type and store the result in data pointer. The structure | |
| 1981 * of the data pointer is dependent on the AVP type. This function calls the "type_data_interpret" callback | |
| 1982 * of the type. | |
| 1983 * | |
| 1984 * RETURN VALUE: | |
| 1985 * 0 : The avp_value has been set. | |
| 1986 * EINVAL : A parameter is invalid. | |
| 1987 * ENOTSUP : There is no appropriate callback registered with this AVP's type. | |
| 1988 */ | |
| 1989 int fd_msg_avp_value_interpret ( struct avp *avp, void *data ); | |
| 1990 | |
| 1991 | |
| 1992 /***************************************/ | |
| 1993 /* Message parsing functions */ | |
| 1994 /***************************************/ | |
| 1995 | |
| 1996 /* | |
| 1997 * FUNCTION: fd_msg_bufferize | |
| 1998 * | |
| 1999 * PARAMETERS: | |
| 2000 * msg : A valid msg object. All AVPs must have a value set. | |
| 2001 * buffer : Upon success, this points to a buffer (malloc'd) containing the message ready for network transmission (or security transformations). | |
| 2002 * The buffer may be freed after use. | |
| 2003 * len : if not NULL, the size of the buffer is written here. In any case, this size is updated in the msg header. | |
| 2004 * | |
| 2005 * DESCRIPTION: | |
| 2006 * Renders a message in memory as a buffer that can be sent over the network to the next peer. | |
| 2007 * | |
| 2008 * RETURN VALUE: | |
| 2009 * 0 : The location has been written. | |
| 2010 * EINVAL : The buffer does not contain a valid Diameter message. | |
| 2011 * ENOMEM : Unable to allocate enough memory to create the buffer object. | |
| 2012 */ | |
| 2013 int fd_msg_bufferize ( struct msg * msg, unsigned char ** buffer, size_t * len ); | |
| 2014 | |
| 2015 /* | |
| 2016 * FUNCTION: fd_msg_parse_buffer | |
| 2017 * | |
| 2018 * PARAMETERS: | |
| 2019 * buffer : Pointer to a buffer containing a message received from the network. | |
| 2020 * buflen : the size in bytes of the buffer. | |
| 2021 * msg : Upon success, this points to a valid msg object. No AVP value is resolved in this object, nor grouped AVP. | |
| 2022 * | |
| 2023 * DESCRIPTION: | |
| 2024 * This function parses a buffer an creates a msg object to represent the structure of the message. | |
| 2025 * Since no dictionary lookup is performed, the values of the AVPs are not interpreted. To interpret the values, | |
| 2026 * the returned message object must be passed to fd_msg_parse_dict function. | |
| 2027 * The buffer pointer is saved inside the message and will be freed when not needed anymore. | |
| 2028 * | |
| 2029 * RETURN VALUE: | |
| 2030 * 0 : The location has been written. | |
| 2031 * ENOMEM : Unable to allocate enough memory to create the msg object. | |
| 2032 * EBADMSG : The buffer does not contain a valid Diameter message (or is truncated). | |
| 2033 * EINVAL : A parameter is invalid. | |
| 2034 */ | |
| 2035 int fd_msg_parse_buffer ( unsigned char ** buffer, size_t buflen, struct msg ** msg ); | |
| 2036 | |
| 2037 /* | |
| 2038 * FUNCTION: fd_msg_parse_dict | |
| 2039 * | |
| 2040 * PARAMETERS: | |
| 2041 * object : A msg or AVP object as returned by fd_msg_parse_buffer. | |
| 2042 * dict : the dictionary containing the objects definitions to use for resolving all AVPs. | |
| 2043 * | |
| 2044 * DESCRIPTION: | |
| 2045 * This function looks up for the command and each children AVP definitions in the dictionary. | |
| 2046 * If the dictionary definition is found, avp_model is set and the value of the AVP is interpreted accordingly and: | |
| 2047 * - for grouped AVPs, the children AVP are created and interpreted also. | |
| 2048 * - for numerical AVPs, the value is converted to host byte order and saved in the avp_value field. | |
| 2049 * - for octetstring AVPs, the string is copied into a new buffer and its address is saved in avp_value. | |
| 2050 * If the dictionary definition is not found, avp_model is set to NULL and | |
| 2051 * the content of the AVP is saved as an octetstring in an internal structure. avp_value is NULL. | |
| 2052 * As a result, after this function has been called, there is no more dependency of the msg object to the message buffer, that is be freed. | |
| 2053 * | |
| 2054 * RETURN VALUE: | |
| 2055 * 0 : The message has been fully parsed as described. | |
| 2056 * EINVAL : The msg parameter is invalid for this operation. | |
| 2057 * ENOMEM : Unable to allocate enough memory to complete the operation. | |
| 2058 * ENOTSUP : No dictionary definition for the command or one of the mandatory AVP was found. | |
| 2059 */ | |
| 2060 int fd_msg_parse_dict ( msg_or_avp * object, struct dictionary * dict ); | |
| 2061 | |
| 2062 /* | |
| 2063 * FUNCTION: fd_msg_parse_rules | |
| 2064 * | |
| 2065 * PARAMETERS: | |
| 2066 * object : A msg or grouped avp object that must be verified. | |
| 2067 * dict : The dictionary containing the rules definitions. | |
| 2068 * rule : If not NULL, the first conflicting rule will be saved here if a conflict is found. | |
| 2069 * | |
| 2070 * DESCRIPTION: | |
| 2071 * Check that the children of the object do not conflict with the dictionary rules (ABNF compliance). | |
| 2072 * | |
| 2073 * RETURN VALUE: | |
| 2074 * 0 : The message has been fully parsed and complies to the defined rules. | |
| 2075 * EBADMSG : A conflict was detected, or a mandatory AVP is unknown in the dictionary. | |
| 2076 * EINVAL : The msg or avp object is invalid for this operation. | |
| 2077 * ENOMEM : Unable to allocate enough memory to complete the operation. | |
| 2078 */ | |
| 2079 int fd_msg_parse_rules ( msg_or_avp * object, struct dictionary * dict, struct dict_object ** rule); | |
| 2080 | |
| 2081 | |
| 2082 /* | |
| 2083 * FUNCTION: fd_msg_update_length | |
| 2084 * | |
| 2085 * PARAMETERS: | |
| 2086 * object : Pointer to a valid msg or avp. | |
| 2087 * | |
| 2088 * DESCRIPTION: | |
| 2089 * Update the length field of the object passed as parameter. | |
| 2090 * As a side effect, all children objects are also updated. Therefore, all avp_value fields of | |
| 2091 * the children AVPs must be set, or an error will occur. | |
| 2092 * | |
| 2093 * RETURN VALUE: | |
| 2094 * 0 : The size has been recomputed. | |
| 2095 * EINVAL : A parameter is invalid. | |
| 2096 */ | |
| 2097 int fd_msg_update_length ( msg_or_avp * object ); | |
| 2098 | |
| 2099 | |
|
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2100 /*============================================================*/ |
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2101 /* DISPATCH */ |
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2102 /*============================================================*/ |
|
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2103 |
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2104 /* Dispatch module (passing incoming messages to extensions registered callbacks) |
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2105 * is split between the library and the daemon. |
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2106 * |
|
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2107 * The library provides the support for associating dispatch callbacks with |
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2108 * dictionary objects. |
|
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|
2109 * |
|
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2110 * The daemon is responsible for calling the callbacks for a message when appropriate. |
|
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2111 * |
|
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2112 * |
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2113 * The dispatch module has two main roles: |
|
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2114 * - help determine if a message can be handled locally (during the routing step) |
|
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2115 * This decision involves only the application-id of the message. |
|
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2116 * - pass the message to the callback(s) that will handle it (during the dispatch step) |
|
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|
2117 * |
|
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2118 * The first role is handled by the daemon. |
|
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2119 * |
|
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2120 * About the second, these are the possibilities for registering a dispatch callback: |
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2121 * |
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2122 * -> For All messages. |
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2123 * This callback is called for all messages that are handled locally. This should be used only |
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2124 * for debug purpose. |
|
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2125 * |
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2126 * -> by AVP value (constants only). |
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2127 * This callback will be called when a message is received and contains an AVP with a specified enumerated value. |
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2128 * |
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2129 * -> by AVP. |
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2130 * This callback will be called when the received message contains a certain AVP. |
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2131 * |
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2132 * -> by command-code. |
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2133 * This callback will be called when the message is a specific command (and 'R' flag). |
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2134 * |
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2135 * -> by application. |
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2136 * This callback will be called when the message has a specific application-id. |
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2137 * |
|
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2138 * ( by vendor: would this be useful? it may be added later) |
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2139 */ |
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2140 enum disp_how { |
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2141 DISP_HOW_ANY = 1, /* Any message. This should be only used for debug. */ |
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2142 DISP_HOW_APPID, /* Any message with the specified application-id */ |
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2143 DISP_HOW_CC, /* Messages of the specified command-code (request or answer). App id may be specified. */ |
|
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2144 DISP_HOW_AVP, /* Messages containing a specific AVP. Command-code and App id may be specified. */ |
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2145 DISP_HOW_AVP_ENUMVAL /* Messages containing a specific AVP with a specific enumerated value. Command-code and App id may be specified. */ |
|
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2146 }; |
|
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2147 /* |
|
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2148 * Several criteria may be selected at the same time, for example command-code AND application id. |
|
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2149 * |
|
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2150 * If several callbacks are registered for the same object, they are called in the order they were registered. |
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2151 * The order in which the callbacks are called is: |
|
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2152 * DISP_HOW_ANY |
|
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2153 * DISP_HOW_AVP_ENUMVAL & DISP_HOW_AVP |
|
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2154 * DISP_HOW_CC |
|
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2155 * DISP_HOW_APPID |
|
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2156 */ |
|
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|
2157 |
|
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2158 /* When a callback is registered, a "when" argument is passed in addition to the disp_how value, |
|
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2159 * to specify which values the criteria must match. */ |
|
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2160 struct disp_when { |
|
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2161 struct dict_object * app; |
|
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2162 struct dict_object * command; |
|
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2163 struct dict_object * avp; |
|
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2164 struct dict_object * value; |
|
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2165 }; |
|
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|
2166 |
|
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2167 /* Note that all the dictionary objects should really belong to the same dictionary! |
|
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2168 * |
|
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2169 * Here is the details on this "when" argument, depending on the disp_how value. |
|
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|
2170 * |
|
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|
2171 * DISP_HOW_ANY. |
|
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2172 * In this case, "when" must be NULL. |
|
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2173 * |
|
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|
2174 * DISP_HOW_APPID. |
|
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2175 * Only the "app_id" field must be set, other fields are ignored. It points to a dictionary object of type DICT_APPLICATION. |
|
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2176 * |
|
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|
2177 * DISP_HOW_CC. |
|
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2178 * The "command" field must be defined and point to a dictionary object of type DICT_COMMAND. |
|
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|
2179 * The "app_id" may be also set. In the case it is set, it restricts the callback to be called only with this command-code and app id. |
|
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2180 * The other fields are ignored. |
|
e5af94b04946
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|
2181 * |
|
e5af94b04946
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6
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|
2182 * DISP_HOW_AVP. |
|
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6
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|
2183 * The "avp" field of the structure must be set and point to a dictionary object of type DICT_AVP. |
|
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2184 * The "app_id" field may be set to restrict the messages matching to a specific app id. |
|
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6
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2185 * The "command" field may also be set to a valid DICT_COMMAND object. |
|
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2186 * The content of the "value" field is ignored. |
|
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|
2187 * |
|
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|
2188 * DISP_HOW_AVP_ENUMVAL. |
|
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6
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2189 * All fields have the same constraints and meaning as in DISP_REG_AVP. In addition, the "value" field must be set |
|
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2190 * and points to a valid DICT_ENUMVAL object. |
|
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2191 * |
|
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2192 * Here is a sumary of the fields: ( M : must be set; m : may be set; 0 : ignored ) |
|
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2193 * field: app_id command avp value |
|
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2194 * APPID : M 0 0 0 |
|
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2195 * CC : m M 0 0 |
|
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2196 * AVP : m m M 0 |
|
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2197 * ENUMVA: m m M M |
|
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2198 */ |
|
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|
2199 |
|
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|
2200 enum disp_action { |
|
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2201 DISP_ACT_CONT, /* The next handler should be called, unless *msg == NULL. */ |
|
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2202 DISP_ACT_SEND /* The updated message must be sent. No further callback is called. */ |
|
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2203 }; |
|
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2204 /* The callbacks that are registered have the following prototype: |
|
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2205 * int dispatch_callback( struct msg ** msg, struct avp * avp, struct session * session, enum disp_action * action ); |
|
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2206 * |
|
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2207 * CALLBACK: dispatch_callback |
|
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2208 * |
|
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2209 * PARAMETERS: |
|
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2210 * msg : the received message on function entry. may be updated to answer on return (see description) |
|
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2211 * avp : for callbacks registered with DISP_HOW_AVP or DISP_HOW_AVP_ENUMVAL, direct link to the triggering AVP. |
|
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2212 * session : if the message contains a Session-Id AVP, the corresponding session object, NULL otherwise. |
|
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2213 * action : upon return, this tells the daemon what to do next. |
|
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|
2214 * |
|
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2215 * DESCRIPTION: |
|
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2216 * Called when a received message matchs the condition for which the callback was registered. |
|
e5af94b04946
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parents:
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2217 * This callback may do any kind of processing on the message, including: |
|
e5af94b04946
Added dispatch module and tests
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parents:
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2218 * - create an answer for a request. |
|
e5af94b04946
Added dispatch module and tests
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6
diff
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2219 * - proxy a request or message, add / remove the Proxy-Info AVP, then forward the message. |
|
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2220 * - update a routing table or start a connection with a new peer, then forward the message. |
|
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Added dispatch module and tests
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2221 * - ... |
|
e5af94b04946
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|
2222 * |
|
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2223 * When *action == DISP_ACT_SEND on callback return, the msg pointed by *msg is passed to the routing module for sending. |
|
e5af94b04946
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2224 * When *action == DISP_ACT_CONT, the next registered callback is called. |
|
e5af94b04946
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2225 * When the last callback gives also DISP_ACT_CONT action value, a default handler is called. It's behavior is as follow: |
|
e5af94b04946
Added dispatch module and tests
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2226 * - if the message is an answer, it is discarded. |
|
e5af94b04946
Added dispatch module and tests
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2227 * - if the message is a request, it is passed again to the routing stack, and marked as non-local handling. |
|
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2228 * |
|
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2229 * RETURN VALUE: |
|
e5af94b04946
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2230 * 0 : The callback executed successfully and updated *action appropriately. |
|
e5af94b04946
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2231 * !0 : standard errors. In case of error, the message is discarded. |
|
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2232 */ |
|
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|
2233 |
|
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2234 /* This structure represents a handler for a registered callback, allowing its de-registration */ |
|
e5af94b04946
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2235 struct disp_hdl; |
|
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2236 |
|
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|
2237 /* |
|
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2238 * FUNCTION: fd_disp_register |
|
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Added dispatch module and tests
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2239 * |
|
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|
2240 * PARAMETERS: |
|
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2241 * cb : The callback function to register (see dispatch_callback description above). |
|
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2242 * how : How the callback must be registered. |
|
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2243 * when : Values that must match, depending on the how argument. |
|
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2244 * handle : On success, a handler to the registered callback is stored here if not NULL. |
|
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2245 * This handler can be used to unregister the cb. |
|
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2246 * |
|
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2247 * DESCRIPTION: |
|
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2248 * Register a new callback to handle messages delivered locally. |
|
e5af94b04946
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2249 * |
|
e5af94b04946
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|
2250 * RETURN VALUE: |
|
e5af94b04946
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|
2251 * 0 : The callback is registered. |
|
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Added dispatch module and tests
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2252 * EINVAL : A parameter is invalid. |
|
e5af94b04946
Added dispatch module and tests
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|
2253 * ENOMEM : Not enough memory to complete the operation |
|
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|
2254 */ |
|
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|
2255 int fd_disp_register ( int (*cb)( struct msg **, struct avp *, struct session *, enum disp_action *), |
|
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|
2256 enum disp_how how, struct disp_when * when, struct disp_hdl ** handle ); |
|
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2257 |
|
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|
2258 /* |
|
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|
2259 * FUNCTION: fd_disp_unregister |
|
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|
2260 * |
|
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|
2261 * PARAMETERS: |
|
e5af94b04946
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2262 * handle : Location of the handle of the callback that must be unregistered. |
|
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2263 * |
|
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|
2264 * DESCRIPTION: |
|
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2265 * Removes a callback previously registered by fd_disp_register. |
|
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|
2266 * |
|
e5af94b04946
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|
2267 * RETURN VALUE: |
|
e5af94b04946
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6
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|
2268 * 0 : The callback is unregistered. |
|
e5af94b04946
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|
2269 * EINVAL : A parameter is invalid. |
|
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Added dispatch module and tests
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6
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|
2270 */ |
|
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6
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|
2271 int fd_disp_unregister ( struct disp_hdl ** handle ); |
|
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6
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|
2272 |
|
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6
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|
2273 /* |
|
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|
2274 * FUNCTION: fd_msg_dispatch |
|
e5af94b04946
Added dispatch module and tests
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6
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|
2275 * |
|
e5af94b04946
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Sebastien Decugis <sdecugis@nict.go.jp>
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6
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|
2276 * PARAMETERS: |
|
e5af94b04946
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2277 * msg : A msg object that have already been fd_msg_parse_dict. |
|
e5af94b04946
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2278 * session : The session corresponding to this object, if any. |
|
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6
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|
2279 * action : Upon return, the action that must be taken on the message |
|
e5af94b04946
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Sebastien Decugis <sdecugis@nict.go.jp>
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6
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|
2280 * |
|
e5af94b04946
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Sebastien Decugis <sdecugis@nict.go.jp>
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6
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|
2281 * DESCRIPTION: |
|
e5af94b04946
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6
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|
2282 * Call all handlers registered for a given message. |
|
e5af94b04946
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6
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|
2283 * The session must have already been resolved on entry. |
|
e5af94b04946
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6
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|
2284 * The msg pointed may be updated during this process. |
|
e5af94b04946
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6
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|
2285 * Upon return, the action parameter points to what must be done next. |
|
e5af94b04946
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Sebastien Decugis <sdecugis@nict.go.jp>
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6
diff
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|
2286 * |
|
e5af94b04946
Added dispatch module and tests
Sebastien Decugis <sdecugis@nict.go.jp>
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6
diff
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|
2287 * RETURN VALUE: |
|
e5af94b04946
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Sebastien Decugis <sdecugis@nict.go.jp>
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6
diff
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|
2288 * 0 : Success. |
|
e5af94b04946
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Sebastien Decugis <sdecugis@nict.go.jp>
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6
diff
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|
2289 * EINVAL : A parameter is invalid. |
|
e5af94b04946
Added dispatch module and tests
Sebastien Decugis <sdecugis@nict.go.jp>
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6
diff
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|
2290 * (other errors) |
|
e5af94b04946
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6
diff
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|
2291 */ |
|
e5af94b04946
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6
diff
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|
2292 int fd_msg_dispatch ( struct msg ** msg, struct session * session, enum disp_action *action ); |
|
e5af94b04946
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6
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|
2293 |
|
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|
2294 |
| 0 | 2295 |
| 2296 /*============================================================*/ | |
|
8
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2297 /* QUEUES */ |
| 0 | 2298 /*============================================================*/ |
| 2299 | |
|
8
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2300 /* Management of FIFO queues of elements */ |
| 0 | 2301 |
|
8
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2302 /* A queue is an opaque object */ |
|
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2303 struct fifo; |
| 0 | 2304 |
| 2305 /* | |
|
8
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2306 * FUNCTION: fd_fifo_new |
| 0 | 2307 * |
| 2308 * PARAMETERS: | |
|
8
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2309 * queue : Upon success, a pointer to the new queue is saved here. |
| 0 | 2310 * |
| 2311 * DESCRIPTION: | |
|
8
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2312 * Create a new empty queue. |
| 0 | 2313 * |
| 2314 * RETURN VALUE : | |
|
8
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2315 * 0 : The queue has been initialized successfully. |
| 0 | 2316 * EINVAL : The parameter is invalid. |
| 2317 * ENOMEM : Not enough memory to complete the creation. | |
| 2318 */ | |
|
8
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|
2319 int fd_fifo_new ( struct fifo ** queue ); |
| 0 | 2320 |
| 2321 /* | |
|
8
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2322 * FUNCTION: fd_fifo_del |
| 0 | 2323 * |
| 2324 * PARAMETERS: | |
|
8
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2325 * queue : Pointer to an empty queue to delete. |
| 0 | 2326 * |
| 2327 * DESCRIPTION: | |
|
8
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|
2328 * Destroys a queue. This is only possible if no thread is waiting for an element, |
| 0 | 2329 * and the queue is empty. |
| 2330 * | |
| 2331 * RETURN VALUE: | |
|
8
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|
2332 * 0 : The queue has been destroyed successfully. |
| 0 | 2333 * EINVAL : The parameter is invalid. |
| 2334 */ | |
|
8
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|
2335 int fd_fifo_del ( struct fifo ** queue ); |
| 0 | 2336 |
| 2337 /* | |
|
8
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|
2338 * FUNCTION: fd_fifo_length |
| 0 | 2339 * |
| 2340 * PARAMETERS: | |
|
8
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|
2341 * queue : The queue from which to retrieve the number of elements. |
|
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2342 * length : Upon success, the current number of elements in the queue is stored here. |
| 0 | 2343 * |
| 2344 * DESCRIPTION: | |
|
8
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2345 * Retrieve the number of elements in a queue. |
| 0 | 2346 * |
| 2347 * RETURN VALUE: | |
| 2348 * 0 : The length of the queue has been written. | |
| 2349 * EINVAL : A parameter is invalid. | |
| 2350 */ | |
|
8
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|
2351 int fd_fifo_length ( struct fifo * queue, int * length ); |
|
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|
2352 int fd_fifo_length_noerr ( struct fifo * queue ); /* no error checking version */ |
| 0 | 2353 |
| 2354 /* | |
|
8
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|
2355 * FUNCTION: fd_fifo_setthrhd |
| 0 | 2356 * |
| 2357 * PARAMETERS: | |
| 2358 * queue : The queue for which the thresholds are being set. | |
| 2359 * data : An opaque pointer that is passed to h_cb and l_cb callbacks. | |
| 2360 * high : The high-level threshold. If the number of elements in the queue increase to this value, h_cb is called. | |
| 2361 * h_cb : if not NULL, a callback to call when the queue lengh is bigger than "high". | |
| 2362 * low : The low-level threshold. Must be < high. | |
| 2363 * l_cb : If the number of elements decrease to low, this callback is called. | |
| 2364 * | |
| 2365 * DESCRIPTION: | |
| 2366 * This function allows to adjust the number of producer / consumer threads of a queue. | |
|
8
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2367 * If the consumer are slower than the producers, the number of elements in the queue increase. |
| 0 | 2368 * By setting a "high" value, we allow a callback to be called when this number is too high. |
| 2369 * The typical use would be to create an additional consumer thread in this callback. | |
| 2370 * If the queue continues to grow, the callback will be called again when the length is 2 * high, then 3*high, ... N * high | |
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2371 * (the callback itself should implement a limit on the number of consumers that can be created) |
| 0 | 2372 * When the queue starts to decrease, and the number of elements go under ((N - 1) * high + low, the l_cb callback is called |
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2373 * and would typially stop one of the consumer threads. If the queue continues to reduce, l_cb is again called at (N-2)*high + low, |
| 0 | 2374 * and so on. |
| 2375 * | |
| 2376 * Since there is no destructor for the data pointer, if cleanup operations are required, they should be performed in | |
| 2377 * l_cb when the length of the queue is becoming < low. | |
| 2378 * | |
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2379 * Note that the callbacks are called synchronously, during fd_fifo_post or fd_fifo_get. Their operation should be quick. |
| 0 | 2380 * |
| 2381 * RETURN VALUE: | |
| 2382 * 0 : The thresholds have been set | |
| 2383 * EINVAL : A parameter is invalid. | |
| 2384 */ | |
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2385 int fd_fifo_setthrhd ( struct fifo * queue, void * data, uint16_t high, void (*h_cb)(struct fifo *, void **), uint16_t low, void (*l_cb)(struct fifo *, void **) ); |
| 0 | 2386 |
| 2387 /* | |
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2388 * FUNCTION: fd_fifo_post |
| 0 | 2389 * |
| 2390 * PARAMETERS: | |
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2391 * queue : The queue in which the element must be posted. |
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2392 * item : The element that is put in the queue. |
| 0 | 2393 * |
| 2394 * DESCRIPTION: | |
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2395 * An element is added in a queue. Elements are retrieved from the queue in FIFO order |
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2396 * with the fd_fifo_get, fd_fifo_tryget, or fd_fifo_timedget functions. |
| 0 | 2397 * |
| 2398 * RETURN VALUE: | |
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2399 * 0 : The element is queued. |
| 0 | 2400 * EINVAL : A parameter is invalid. |
| 2401 * ENOMEM : Not enough memory to complete the operation. | |
| 2402 */ | |
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2403 int fd_fifo_post_int ( struct fifo * queue, void ** item ); |
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2404 #define fd_fifo_post(queue, item) \ |
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2405 fd_fifo_post_int((queue), (void *)(item)) |
| 0 | 2406 |
| 2407 /* | |
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2408 * FUNCTION: fd_fifo_get |
| 0 | 2409 * |
| 2410 * PARAMETERS: | |
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2411 * queue : The queue from which the first element must be retrieved. |
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2412 * item : On return, the first element of the queue is stored here. |
| 0 | 2413 * |
| 2414 * DESCRIPTION: | |
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2415 * This function retrieves the first element from a queue. If the queue is empty, the function will block the |
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2416 * thread until a new element is posted to the queue, or until the thread is canceled (in which case the |
| 0 | 2417 * function does not return). |
| 2418 * | |
| 2419 * RETURN VALUE: | |
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2420 * 0 : A new element has been retrieved. |
| 0 | 2421 * EINVAL : A parameter is invalid. |
| 2422 */ | |
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2423 int fd_fifo_get_int ( struct fifo * queue, void ** item ); |
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2424 #define fd_fifo_get(queue, item) \ |
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2425 fd_fifo_get_int((queue), (void *)(item)) |
| 0 | 2426 |
| 2427 /* | |
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2428 * FUNCTION: fd_fifo_tryget |
| 0 | 2429 * |
| 2430 * PARAMETERS: | |
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2431 * queue : The queue from which the element must be retrieved. |
| 0 | 2432 * msg : On return, the message is stored here. |
| 2433 * | |
| 2434 * DESCRIPTION: | |
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2435 * This function is similar to fd_fifo_get, except that it will not block if |
| 0 | 2436 * the queue is empty, but return EWOULDBLOCK instead. |
| 2437 * | |
| 2438 * RETURN VALUE: | |
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2439 * 0 : A new element has been retrieved. |
| 0 | 2440 * EINVAL : A parameter is invalid. |
| 2441 * EWOULDBLOCK : The queue was empty. | |
| 2442 */ | |
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2443 int fd_fifo_tryget_int ( struct fifo * queue, void ** item ); |
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2444 #define fd_fifo_tryget(queue, item) \ |
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2445 fd_fifo_tryget_int((queue), (void *)(item)) |
| 0 | 2446 |
| 2447 /* | |
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2448 * FUNCTION: fd_fifo_timedget |
| 0 | 2449 * |
| 2450 * PARAMETERS: | |
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2451 * queue : The queue from which the element must be retrieved. |
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2452 * item : On return, the element is stored here. |
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2453 * abstime : the absolute time until which we allow waiting for an item. |
| 0 | 2454 * |
| 2455 * DESCRIPTION: | |
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2456 * This function is similar to fd_fifo_get, except that it will block if the queue is empty |
| 0 | 2457 * only until the absolute time abstime (see pthread_cond_timedwait for + info). |
| 2458 * If the queue is still empty when the time expires, the function returns ETIMEDOUT | |
| 2459 * | |
| 2460 * RETURN VALUE: | |
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2461 * 0 : A new item has been retrieved. |
| 0 | 2462 * EINVAL : A parameter is invalid. |
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2463 * ETIMEDOUT : The time out has passed and no item has been received. |
| 0 | 2464 */ |
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2465 int fd_fifo_timedget_int ( struct fifo * queue, void ** item, const struct timespec *abstime ); |
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2466 #define fd_fifo_timedget(queue, item, abstime) \ |
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2467 fd_fifo_timedget_int((queue), (void *)(item), (abstime)) |
| 0 | 2468 |
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2469 /* Dump a fifo list and optionally its inner elements -- beware of deadlocks! */ |
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2470 void fd_fifo_dump(int level, char * name, struct fifo * queue, void (*dump_item)(int level, void * item)); |
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2471 |
| 0 | 2472 #endif /* _LIBFREEDIAMETER_H */ |