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annotate libfdcore/extensions.c @ 706:4ffbc9f1e922

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Large UNTESTED commit with the following changes: * Improved DiameterIdentity handling (esp. interationalization issues), and improve efficiency of some string operations in peers, sessions, and dictionary modules (closes #7) * Cleanup in the session module to free only unreferenced sessions (#16) * Removed fd_cpu_flush_cache(), replaced by more robust alternatives. * Improved peer state machine algorithm to counter SCTP multistream race condition.
author Sebastien Decugis <sdecugis@nict.go.jp>
date Wed, 09 Feb 2011 15:26:58 +0900
parents 712a0bb8d3bf
children 4a0b61061a6d
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@nict.go.jp> *
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4 * *
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2e94ef0515d7 Updated copyright information
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5 * Copyright (c) 2011, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * permitted provided that the following conditions are met: *
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10 * *
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11 * * Redistributions of source code must retain the above *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 #include "fdcore-internal.h"
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37
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38 #include <dlfcn.h> /* We may use libtool's <ltdl.h> later for better portability.... */
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39
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40 /* plugins management */
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41
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42 /* List of extensions to load, from the configuration parsing */
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43 struct fd_ext_info {
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44 struct fd_list chain; /* link in the list */
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45 char *filename; /* extension filename. must be a dynamic library with fd_ext_init symbol. */
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46 char *conffile; /* optional configuration file name for the extension */
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47 void *handler; /* object returned by dlopen() */
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48 void (*fini)(void); /* optional address of the fd_ext_fini callback */
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49 };
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50
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51 /* list of extensions */
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52 static struct fd_list ext_list = FD_LIST_INITIALIZER(ext_list);
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53
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54 /* Add new extension */
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55 int fd_ext_add( char * filename, char * conffile )
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56 {
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57 struct fd_ext_info * new;
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58
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59 TRACE_ENTRY("%p %p", filename, conffile);
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60
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61 /* Check the filename is valid */
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62 CHECK_PARAMS( filename );
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63
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64 /* Create a new object in the list */
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65 CHECK_MALLOC( new = malloc( sizeof(struct fd_ext_info) ) );
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66 memset(new, 0, sizeof(struct fd_ext_info));
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67 fd_list_init(&new->chain, NULL);
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68 new->filename = filename;
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69 new->conffile = conffile;
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70 fd_list_insert_before( &ext_list, &new->chain );
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71 TRACE_DEBUG (FULL, "Extension %s added to the list.", filename);
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72 return 0;
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73 }
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74
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75 /* Dump the list */
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76 void fd_ext_dump(void)
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77 {
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78 struct fd_list * li;
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79
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80 fd_log_debug("Dumping extensions list :\n");
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81
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82 for (li = ext_list.next; li != &ext_list; li = li->next)
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83 {
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84 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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85 fd_log_debug(" - '%s'[%s] is %sloaded\n", ext->filename, ext->conffile?:"no conf", ext->handler ? "" : "not ");
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86 }
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87 }
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88
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89 /* Load all extensions in the list */
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90 int fd_ext_load()
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91 {
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92 int ret;
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93 int (*fd_ext_init)(int, int, char *) = NULL;
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94 struct fd_list * li;
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95
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96 TRACE_ENTRY();
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97
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98 /* Loop on all extensions */
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99 for (li = ext_list.next; li != &ext_list; li = li->next)
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100 {
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101 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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102 TRACE_DEBUG (INFO, "Loading : %s", ext->filename);
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103
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104 /* Load the extension */
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105 #ifndef DEBUG
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106 ext->handler = dlopen(ext->filename, RTLD_LAZY | RTLD_GLOBAL);
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107 #else /* DEBUG */
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108 /* We resolve symbols immediatly so it's easier to find problems in ABI */
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109 ext->handler = dlopen(ext->filename, RTLD_NOW | RTLD_GLOBAL);
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110 #endif /* DEBUG */
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111 if (ext->handler == NULL) {
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112 /* An error occured */
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113 TRACE_DEBUG( NONE, "Loading of extension %s failed:\n %s\n", ext->filename, dlerror());
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114 return EINVAL;
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115 }
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116
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117 /* Resolve the entry point of the extension */
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118 fd_ext_init = ( int (*) (int, int, char *) )dlsym( ext->handler, "fd_ext_init" );
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119
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120 if (fd_ext_init == NULL) {
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121 /* An error occured */
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122 TRACE_DEBUG( NONE, "Unable to resolve symbol 'fd_ext_init' for extension %s:\n %s\n", ext->filename, dlerror());
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123 return EINVAL;
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124 }
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125
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126 /* Resolve the exit point of the extension, which is optional for extensions */
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127 ext->fini = ( void (*) (void) )dlsym( ext->handler, "fd_ext_fini" );
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128
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129 if (ext->fini == NULL) {
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130 /* Not provided */
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131 TRACE_DEBUG (FULL, "Extension [%s] has no fd_ext_fini function.", ext->filename);
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132 } else {
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133 /* Provided */
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134 TRACE_DEBUG (FULL, "Extension [%s] fd_ext_fini has been resolved successfully.", ext->filename);
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135 }
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136
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137 /* Now call the entry point to initialize the extension */
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138 ret = (*fd_ext_init)( FD_PROJECT_VERSION_MAJOR, FD_PROJECT_VERSION_MINOR, ext->conffile );
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139 if (ret != 0) {
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140 /* The extension was unable to load cleanly */
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141 TRACE_DEBUG( NONE, "Extension %s returned an error during initialization: %s\n", ext->filename, strerror(ret));
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142 return ret;
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143 }
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144
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145 /* Proceed to the next extension */
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146 }
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147
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148 TRACE_DEBUG (INFO, "All extensions loaded.");
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149
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150 /* We have finished. */
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151 return 0;
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152 }
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153
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154 /* Now unload the extensions and free the memory */
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155 int fd_ext_term( void )
8
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156 {
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157 TRACE_ENTRY();
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158
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159 /* Loop on all extensions, in FIFO order */
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160 while (!FD_IS_LIST_EMPTY(&ext_list))
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161 {
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162 struct fd_list * li = ext_list.next;
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163 struct fd_ext_info * ext = (struct fd_ext_info *)li;
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164
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165 /* Unlink this element from the list */
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166 fd_list_unlink(li);
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167
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168 /* Call the exit point of the extension, if it was resolved */
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169 if (ext->fini != NULL) {
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170 TRACE_DEBUG (FULL, "Calling [%s]->fd_ext_fini function.", ext->filename);
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171 (*ext->fini)();
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172 }
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173
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174 #ifndef SKIP_DLCLOSE
8
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175 /* Now unload the extension */
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176 if (ext->handler) {
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177 TRACE_DEBUG (FULL, "Unloading %s", ext->filename);
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178 if ( dlclose(ext->handler) != 0 ) {
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179 TRACE_DEBUG (INFO, "Unloading [%s] failed : %s\n", ext->filename, dlerror());
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180 }
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181 }
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182 #endif /* SKIP_DLCLOSE */
8
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183
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184 /* Free the object and continue */
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185 free(ext->filename);
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186 free(ext->conffile);
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187 free(ext);
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188 }
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189
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190 /* We always return 0 since we would not handle an error anyway... */
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191 return 0;
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192 }
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193
"Welcome to our mercurial repository"