Mercurial > hg > freeDiameter
annotate include/freeDiameter/libfdcore.h @ 740:4a9f08d6b6ba
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author | Sebastien Decugis <sdecugis@nict.go.jp> |
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date | Thu, 24 Mar 2011 15:00:18 +0900 |
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0 | 1 /********************************************************************************************************* |
2 * Software License Agreement (BSD License) * | |
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3 * Author: Sebastien Decugis <sdecugis@freediameter.net> * |
0 | 4 * * |
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5 * Copyright (c) 2011, WIDE Project and NICT * |
0 | 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 #ifndef _LIBFDCORE_H |
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37 #define _LIBFDCORE_H |
0 | 38 |
39 | |
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40 #include <freeDiameter/libfdproto.h> |
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41 #include <gnutls/gnutls.h> |
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42 #include <gnutls/x509.h> |
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43 |
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44 /* GNUTLS version */ |
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45 #ifndef GNUTLS_VERSION |
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46 #define GNUTLS_VERSION LIBGNUTLS_VERSION |
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47 #endif /* GNUTLS_VERSION */ |
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48 |
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49 /* GNUTLS calls debug level */ |
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50 #ifndef GNUTLS_DBG_LEVEL |
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51 #define GNUTLS_DBG_LEVEL ANNOYING |
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52 #endif /* GNUTLS_DBG_LEVEL */ |
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53 |
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54 /* Check the return value of a GNUTLS function, log and propagate */ |
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55 #define CHECK_GNUTLS_DO( __call__, __fallback__ ) { \ |
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56 int __ret__; \ |
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57 TRACE_DEBUG(GNUTLS_DBG_LEVEL, "GNUTLS call: " #__call__ ); \ |
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58 __ret__ = (__call__); \ |
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59 if (__ret__ < 0) { \ |
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60 TRACE_DEBUG(INFO, "Error in '" #__call__ "':\t%s", gnutls_strerror(__ret__)); \ |
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61 __fallback__; \ |
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62 } \ |
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63 } |
0 | 64 |
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65 /* For GNUTLS routines that do not return a value */ |
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66 #define GNUTLS_TRACE( __call__) { \ |
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67 TRACE_DEBUG(GNUTLS_DBG_LEVEL, "GNUTLS call: " #__call__ ); \ |
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68 (__call__); \ |
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69 } |
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70 |
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71 |
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72 /*============================================================*/ |
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73 /* INITIALIZATION */ |
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74 /*============================================================*/ |
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75 |
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76 |
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77 /* Initialize the libfdcore internals. This also initializes libfdproto */ |
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78 int fd_core_initialize(void); |
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79 |
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80 /* Return a string describing the version of the library */ |
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81 const char *fd_core_version(void); |
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82 |
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83 /* Parse the freeDiameter.conf configuration file, load the extensions */ |
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84 int fd_core_parseconf(char * conffile); |
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85 |
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86 /* Start the server & client threads */ |
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87 int fd_core_start(void); |
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88 |
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89 /* Block until the framework has completed its initialization -- useful for extensions */ |
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90 int fd_core_waitstartcomplete(void); |
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91 |
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92 /* Initialize shutdown of the framework */ |
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93 int fd_core_shutdown(void); |
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94 |
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95 /* Wait for the shutdown to be complete -- this should always be called after fd_core_shutdown */ |
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96 int fd_core_wait_shutdown_complete(void); |
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97 |
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98 |
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99 /*============================================================*/ |
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100 /* CONFIG */ |
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101 /*============================================================*/ |
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102 |
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103 /* Structure to hold the configuration of the freeDiameter daemon */ |
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104 #define EYEC_CONFIG 0xC011F16 |
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105 struct fd_config { |
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106 int cnf_eyec; /* Eye catcher: EYEC_CONFIG */ |
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107 |
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108 char *cnf_file; /* Configuration file to parse, default is DEFAULT_CONF_FILE */ |
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109 |
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110 DiamId_t cnf_diamid; /* Diameter Identity of the local peer (FQDN -- ASCII) */ |
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111 size_t cnf_diamid_len;/* cached length of the previous string */ |
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112 DiamId_t cnf_diamrlm; /* Diameter realm of the local peer, default to realm part of cnf_diamid */ |
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113 size_t cnf_diamrlm_len;/* length of the previous string */ |
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114 |
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115 unsigned int cnf_timer_tc; /* The value in seconds of the default Tc timer */ |
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116 unsigned int cnf_timer_tw; /* The value in seconds of the default Tw timer */ |
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117 |
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118 uint16_t cnf_port; /* the local port for legacy Diameter (default: 3868) in host byte order */ |
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119 uint16_t cnf_port_tls; /* the local port for Diameter/TLS (default: 3869) in host byte order */ |
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120 uint16_t cnf_sctp_str; /* default max number of streams for SCTP associations (def: 30) */ |
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121 struct fd_list cnf_endpoints; /* the local endpoints to bind the server to. list of struct fd_endpoint. default is empty (bind all) */ |
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122 struct fd_list cnf_apps; /* Applications locally supported (except relay, see flags). Use fd_disp_app_support to add one. list of struct fd_app. */ |
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123 uint16_t cnf_dispthr; /* Number of dispatch threads to create */ |
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124 struct { |
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125 unsigned no_fwd : 1; /* the peer does not relay messages (0xffffff app id) */ |
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126 unsigned no_ip4 : 1; /* disable IP */ |
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127 unsigned no_ip6 : 1; /* disable IPv6 */ |
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128 unsigned no_tcp : 1; /* disable use of TCP */ |
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129 unsigned no_sctp: 1; /* disable the use of SCTP */ |
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130 unsigned pr_tcp : 1; /* prefer TCP over SCTP */ |
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131 unsigned tls_alg: 1; /* TLS algorithm for initiated cnx. 0: separate port. 1: inband-security (old) */ |
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132 } cnf_flags; |
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133 |
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134 struct { |
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135 /* Credentials parameters (backup) */ |
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136 char * cert_file; |
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137 char * key_file; |
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138 |
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139 char * ca_file; |
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140 int ca_file_nr; |
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141 char * crl_file; |
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142 |
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143 char * prio_string; |
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144 unsigned int dh_bits; |
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145 char * dh_file; |
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146 |
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147 /* GNUTLS parameters */ |
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148 gnutls_priority_t prio_cache; |
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149 gnutls_dh_params_t dh_cache; |
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150 |
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151 /* GNUTLS server credential(s) */ |
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152 gnutls_certificate_credentials_t credentials; |
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153 |
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154 } cnf_sec_data; |
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155 |
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156 uint32_t cnf_orstateid; /* The value to use in Origin-State-Id, default to random value */ |
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157 struct dictionary *cnf_dict; /* pointer to the global dictionary */ |
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158 struct fifo *cnf_main_ev; /* events for the daemon's main (struct fd_event items) */ |
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159 }; |
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160 extern struct fd_config *fd_g_config; /* The pointer to access the global configuration, initalized in main */ |
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161 |
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162 |
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163 |
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164 /*============================================================*/ |
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165 /* PEERS */ |
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166 /*============================================================*/ |
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167 |
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168 /* States of a peer */ |
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169 enum peer_state { |
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170 /* Stable states */ |
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171 STATE_NEW = 0, /* The peer has been just been created, PSM thread not started yet */ |
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172 STATE_OPEN, /* Connexion established */ |
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173 |
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174 /* Peer state machine */ |
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175 STATE_CLOSED, /* No connection established, will re-attempt after TcTimer. */ |
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176 STATE_CLOSING, /* the connection is being shutdown (DPR/DPA in progress) */ |
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177 STATE_WAITCNXACK, /* Attempting to establish transport-level connection */ |
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178 STATE_WAITCNXACK_ELEC, /* Received a CER from this same peer on an incoming connection (other peer object), while we were waiting for cnx ack */ |
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179 STATE_WAITCEA, /* Connection established, CER sent, waiting for CEA */ |
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180 /* STATE_WAITRETURNS_ELEC, */ /* This state is not stable and therefore deprecated: |
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181 We have sent a CER on our initiated connection, and received a CER from the remote peer on another connection. Election. |
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182 If we win the election, we must disconnect the initiated connection and send a CEA on the other => we go to OPEN state. |
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183 If we lose, we disconnect the other connection (receiver) and fallback to WAITCEA state. */ |
42 | 184 STATE_OPEN_HANDSHAKE, /* TLS Handshake and validation are in progress in open state -- we use it only for debug purpose, it is never displayed */ |
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185 |
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186 /* Failover state machine */ |
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187 STATE_SUSPECT, /* A DWR was sent and not answered within TwTime. Failover in progress. */ |
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188 STATE_REOPEN, /* Connection has been re-established, waiting for 3 DWR/DWA exchanges before putting back to service */ |
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189 |
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190 /* Ordering issues with multistream & state machine. -- see top of p_psm.c for explanation */ |
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191 STATE_OPEN_NEW, /* after CEA is sent, until a new message is received. Force ordering in this state */ |
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192 STATE_CLOSING_GRACE, /* after DPA is sent or received, give a short delay for messages in the pipe to be received. */ |
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193 |
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194 /* Error state */ |
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195 STATE_ZOMBIE /* The PSM thread is not running anymore; it must be re-started or peer should be deleted. */ |
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196 #define STATE_MAX STATE_ZOMBIE |
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197 }; |
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198 /* The following macro is called in freeDiameter/p_psm.c */ |
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199 #define DECLARE_STATE_STR() \ |
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200 const char *peer_state_str[] = { \ |
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201 "STATE_NEW" \ |
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202 , "STATE_OPEN" \ |
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203 , "STATE_CLOSED" \ |
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204 , "STATE_CLOSING" \ |
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205 , "STATE_WAITCNXACK" \ |
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206 , "STATE_WAITCNXACK_ELEC" \ |
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207 , "STATE_WAITCEA" \ |
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208 , "STATE_OPEN_HANDSHAKE" \ |
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209 , "STATE_SUSPECT" \ |
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210 , "STATE_REOPEN" \ |
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211 , "STATE_OPEN_NEW" \ |
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212 , "STATE_CLOSING_GRACE" \ |
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213 , "STATE_ZOMBIE" \ |
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214 }; |
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215 extern const char *peer_state_str[]; |
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216 #define STATE_STR(state) \ |
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217 (((unsigned)(state)) <= STATE_MAX ? peer_state_str[((unsigned)(state)) ] : "<Invalid>") |
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218 |
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219 /* Constants for the peer_info structure bellow */ |
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220 #define PI_P3_DEFAULT 0 /* Use any available protocol */ |
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221 #define PI_P3_IP 1 /* Use only IP to connect to this peer */ |
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222 #define PI_P3_IPv6 2 /* resp, IPv6 */ |
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223 |
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224 #define PI_P4_DEFAULT 0 /* Attempt any available protocol */ |
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225 #define PI_P4_TCP 1 /* Only use TCP */ |
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226 #define PI_P4_SCTP 2 /* Only use SCTP */ |
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227 |
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228 #define PI_ALGPREF_SCTP 0 /* SCTP is attempted first (default) */ |
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229 #define PI_ALGPREF_TCP 1 /* TCP is attempted first */ |
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230 |
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231 #define PI_SEC_DEFAULT 0 /* New TLS security (handshake after connection, protecting also CER/CEA) */ |
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232 #define PI_SEC_NONE 1 /* Transparent security with this peer (IPsec) */ |
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233 #define PI_SEC_TLS_OLD 2 /* Old TLS security (use Inband-Security-Id AVP during CER/CEA) */ |
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234 /* Set sec = 3 to authorize use of (Inband-Security-Id == NONE) with this peer, sec = 2 only authorizing TLS */ |
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235 |
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236 #define PI_EXP_NONE 0 /* the peer entry does not expire */ |
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237 #define PI_EXP_INACTIVE 1 /* the peer entry expires (i.e. is deleted) after pi_lft seconds without activity */ |
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238 |
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239 #define PI_PRST_NONE 0 /* the peer entry is deleted after disconnection / error */ |
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240 #define PI_PRST_ALWAYS 1 /* the peer entry is persistant (will be kept as ZOMBIE in case of error) */ |
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241 |
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242 /* Information about a remote peer */ |
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243 struct peer_info { |
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244 |
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245 DiamId_t pi_diamid; /* (supposedly) UTF-8, \0 terminated. The Diameter Identity of the remote peer. */ |
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246 size_t pi_diamidlen; /* cached length of pi_diamid */ |
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247 |
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248 struct { |
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249 struct { |
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250 unsigned pro3 :2; /* PI_P3_* */ |
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251 unsigned pro4 :2; /* PI_P4_* */ |
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252 unsigned alg :1; /* PI_ALGPREF_* */ |
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253 unsigned sec :2; /* PI_SEC_* */ |
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254 unsigned exp :1; /* PI_EXP_* */ |
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255 unsigned persist :1; /* PI_PRST_* */ |
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256 |
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257 } pic_flags; /* Flags influencing the connection to the remote peer */ |
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258 |
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259 DiamId_t pic_realm; /* If configured, the daemon will check the received realm in CER/CEA matches this. */ |
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260 uint16_t pic_port; /* port to connect to. 0: default. */ |
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261 |
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262 uint32_t pic_lft; /* lifetime of this peer when inactive (see pic_flags.exp definition) */ |
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263 int pic_tctimer; /* use this value for TcTimer instead of global, if != 0 */ |
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264 int pic_twtimer; /* use this value for TwTimer instead of global, if != 0 */ |
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265 |
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266 char * pic_priority; /* Priority string for GnuTLS if we don't use the default */ |
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267 |
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268 } config; /* Configured data (static for this peer entry) */ |
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269 |
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270 struct { |
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271 |
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272 /* enum peer_state pir_state; */ |
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273 /* Since 1.1.0, read the state with fd_peer_getstate(peer). */ |
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275 DiamId_t pir_realm; /* The received realm in CER/CEA. */ |
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276 size_t pir_realmlen; /* length of the realm */ |
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277 |
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278 uint32_t pir_vendorid; /* Content of the Vendor-Id AVP, or 0 by default */ |
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279 uint32_t pir_orstate; /* Origin-State-Id value */ |
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280 os0_t pir_prodname; /* copy of Product-Name AVP (\0 terminated) */ |
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281 uint32_t pir_firmrev; /* Content of the Firmware-Revision AVP */ |
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282 int pir_relay; /* The remote peer advertized the relay application */ |
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283 struct fd_list pir_apps; /* applications advertised by the remote peer, except relay (pi_flags.relay) */ |
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284 int pir_isi; /* Inband-Security-Id advertised (PI_SEC_* bits) */ |
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285 |
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286 uint32_t pir_lastDC; /* The last Disconnect-Cause value received */ |
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287 |
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288 int pir_proto; /* The L4 protocol currently used with the peer (IPPROTO_TCP or IPPROTO_SCTP) */ |
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289 const gnutls_datum_t *pir_cert_list; /* The (valid) credentials that the peer has presented, or NULL if TLS is not used */ |
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290 /* This is inspired from http://www.gnu.org/software/gnutls/manual/gnutls.html#ex_003ax509_002dinfo |
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291 see there for example of using this data */ |
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292 unsigned int pir_cert_list_size; /* Number of certificates in the list */ |
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293 |
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294 } runtime; /* Data populated after connection, may change between 2 connections -- not used by fd_peer_add */ |
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295 |
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296 struct fd_list pi_endpoints; /* Endpoint(s) of the remote peer (configured, discovered, or advertized). list of struct fd_endpoint. DNS resolved if empty. */ |
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297 }; |
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298 |
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299 |
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300 struct peer_hdr { |
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301 struct fd_list chain; /* Link into the list of all the peers, ordered by their Diameter Id (fd_os_cmp) */ |
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302 struct peer_info info; /* The public data */ |
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303 |
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304 /* This header is followed by more data in the private peer structure definition */ |
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305 }; |
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306 |
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307 /* the global list of peers. |
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308 Since we are not expecting so many connections, we don't use a hash, but it might be changed. |
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309 The list items are peer_hdr structures (actually, fd_peer, but the cast is OK) */ |
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310 extern struct fd_list fd_g_peers; |
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311 extern pthread_rwlock_t fd_g_peers_rw; /* protect the list */ |
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312 |
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313 /* |
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314 * FUNCTION: fd_peer_add |
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315 * |
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316 * PARAMETERS: |
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317 * info : Information to create the peer. |
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318 * orig_dbg : A string indicating the origin of the peer information, for debug (ex: conf, redirect, ...) |
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319 * cb : optional, a callback to call (once) when the peer connection is established or failed |
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320 * cb_data : opaque data to pass to the callback. |
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321 * |
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322 * DESCRIPTION: |
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323 * Add a peer to the list of peers to which the daemon must maintain a connexion. |
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324 * |
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325 * The content of info parameter is copied, except for the list of endpoints if |
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326 * not empty, which is simply moved into the created object. It means that the list |
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327 * items must have been malloc'd, so that they can be freed. |
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328 * |
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329 * If cb is not null, the callback is called when the connection is in OPEN state or |
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330 * when an error has occurred. The callback should use the pi_state information to |
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331 * determine which one it is. If the first parameter of the called callback is NULL, it |
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332 * means that the peer is being destroyed before attempt success / failure. |
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333 * cb is called to allow freeing cb_data in * this case. |
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334 * |
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335 * The orig_dbg string is only useful for easing debug, and can be left to NULL. |
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336 * |
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337 * RETURN VALUE: |
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338 * 0 : The peer is added. |
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339 * EINVAL : A parameter is invalid. |
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340 * EEXIST : A peer with the same Diameter-Id is already in the list. |
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341 * (other standard errors may be returned, too, with their standard meaning. Example: |
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342 * ENOMEM : Memory allocation for the new object element failed.) |
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343 */ |
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344 int fd_peer_add ( struct peer_info * info, char * orig_dbg, void (*cb)(struct peer_info *, void *), void * cb_data ); |
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345 |
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346 /* |
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347 * FUNCTION: fd_peer_getbyid |
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348 * |
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349 * PARAMETERS: |
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350 * diamid : an UTF8 string describing the diameter Id of the peer to seek |
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351 * diamidlen : length of the diamid |
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352 * igncase : perform an almost-case-insensitive search? (slower) |
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353 * peer : The peer is stored here if it exists. |
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354 * |
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355 * DESCRIPTION: |
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356 * Search a peer by its Diameter-Id. |
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357 * |
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358 * RETURN VALUE: |
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359 * 0 : *peer has been updated (to NULL if the peer is not found). |
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360 * !0 : An error occurred. |
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361 */ |
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362 int fd_peer_getbyid( DiamId_t diamid, size_t diamidlen, int igncase, struct peer_hdr ** peer ); |
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363 |
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364 /* |
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365 * FUNCTION: fd_peer_get_state |
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366 * |
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367 * PARAMETERS: |
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368 * peer : The peer which state to read |
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369 * |
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370 * DESCRIPTION: |
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371 * Returns the current state of the peer. |
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372 * |
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373 * RETURN VALUE: |
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374 * -1 : peer is invalid |
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375 * >=0 : the state of the peer at the time of reading. |
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376 */ |
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377 int fd_peer_get_state(struct peer_hdr *peer); |
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378 |
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379 /* |
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380 * FUNCTION: fd_peer_validate_register |
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381 * |
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382 * PARAMETERS: |
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383 * peer_validate : Callback as defined bellow. |
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384 * |
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385 * DESCRIPTION: |
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386 * Add a callback to authorize / reject incoming peer connections. |
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387 * All registered callbacks are called until a callback sets auth = -1 or auth = 1. |
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388 * If no callback returns a clear decision, the default behavior is applied (reject unknown connections) |
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389 * The callbacks are called in FILO order of their registration. |
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390 * |
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391 * RETURN VALUE: |
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392 * 0 : The callback is added. |
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393 * !0 : An error occurred. |
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394 */ |
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395 int fd_peer_validate_register ( int (*peer_validate)(struct peer_info * /* info */, int * /* auth */, int (**cb2)(struct peer_info *)) ); |
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396 /* |
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397 * CALLBACK: peer_validate |
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398 * |
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399 * PARAMETERS: |
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400 * info : Structure containing information about the peer attempting the connection. |
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401 * auth : Store there the result if the peer is accepted (1), rejected (-1), or unknown (0). |
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402 * cb2 : If != NULL and in case of PI_SEC_TLS_OLD, another callback to call after handshake (if auth = 1). |
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403 * |
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404 * DESCRIPTION: |
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405 * This callback is called when a new connection is being established from an unknown peer, |
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406 * after the CER is received. An extension must register such callback with peer_validate_register. |
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407 * |
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408 * The callback can learn if the peer has sent Inband-Security-Id AVPs in runtime.pir_isi fields. |
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409 * It can also learn if a handshake has already been performed in runtime.pir_cert_list field. |
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410 * The callback must set the value of config.pic_flags.sec appropriately to allow a connection without TLS. |
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411 * |
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412 * If the old TLS mechanism is used, |
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413 * the extension may also need to check the credentials provided during the TLS |
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414 * exchange (remote certificate). For this purpose, it may set the address of a new callback |
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415 * to be called once the handshake is completed. This new callback receives the information |
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416 * structure as parameter (with pir_cert_list set) and returns 0 if the credentials are correct, |
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417 * or an error code otherwise. If the error code is received, the connection is closed and the |
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418 * peer is destroyed. |
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419 * Note that freeDiameter already achieves some usual checks. The callback may be used to enforce |
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420 * additional restrictions. |
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421 * |
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422 * RETURN VALUE: |
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423 * 0 : The authorization decision has been written in the location pointed by auth. |
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424 * !0 : An error occurred. |
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425 */ |
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426 |
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427 |
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428 |
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429 /*============================================================*/ |
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430 /* MESSAGES */ |
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431 /*============================================================*/ |
0 | 432 |
433 /* | |
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434 * FUNCTION: fd_msg_send, fd_msg_send_timeout |
0 | 435 * |
436 * PARAMETERS: | |
437 * pmsg : Location of the message to be sent on the network (set to NULL on function return to avoid double deletion). | |
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438 * anscb : A callback to be called when answer is received, if msg is a request (optional for fd_msg_send) |
0 | 439 * anscb_data : opaque data to be passed back to the anscb when it is called. |
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440 * timeout : (only for fd_msg_send_timeout) sets the absolute time until when to wait for an answer. Past this time, |
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441 * the anscb is called with the request as parameter and the answer will be discarded when received. |
0 | 442 * |
443 * DESCRIPTION: | |
444 * Sends a message on the network. (actually simply queues it in a global queue, to be picked by a daemon's thread) | |
445 * For requests, the end-to-end id must be set (see fd_msg_get_eteid / MSGFL_ALLOC_ETEID). | |
446 * For answers, the message must be created with function fd_msg_new_answ. | |
447 * | |
448 * The routing module will handle sending to the correct peer, usually based on the Destination-Realm / Destination-Host AVP. | |
449 * | |
450 * If the msg is a request, there are two ways of receiving the answer: | |
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451 * - either having registered a callback in the dispatch module (see fd_disp_register) |
0 | 452 * - or provide a callback as parameter here. If such callback is provided, it is called before the dispatch callbacks. |
453 * The prototype for this callback function is: | |
454 * void anscb(void * data, struct msg ** answer) | |
455 * where: | |
456 * data : opaque data that was registered along with the callback. | |
457 * answer : location of the pointer to the answer. | |
458 * note1: on function return, if *answer is not NULL, the message is passed to the dispatch module for regular callbacks. | |
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459 * otherwise, the callback must take care of freeing the message (fd_msg_free). |
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460 * note2: the opaque data is not freed by the daemon in any case, extensions should ensure clean handling in fd_ext_fini. |
0 | 461 * |
462 * If no callback is registered to handle an answer, the message is discarded and an error is logged. | |
463 * | |
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464 * fd_msg_send_timeout is similar to fd_msg_send, except that it takes an additional argument "timeout" and can be called |
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465 * only with requests as parameters, and an anscb callback. |
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466 * If the matching answer or error is received before the timeout date passes, everything occurs as with fd_msg_send. Otherwise, |
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467 * the request is removed from the queue (meaning the matching answer will be discarded upon reception) and passed to the answcb |
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468 * function. This function can easily distinguish between timeout case and answer case by checking if the message received is |
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469 * a request. Upon return, if the *msg parameter is not NULL, it is freed (not passed to other callbacks). |
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470 * |
0 | 471 * RETURN VALUE: |
472 * 0 : The message has been queued for sending (sending may fail asynchronously). | |
473 * EINVAL : A parameter is invalid (ex: anscb provided but message is not a request). | |
474 * ... | |
475 */ | |
476 int fd_msg_send ( struct msg ** pmsg, void (*anscb)(void *, struct msg **), void * data ); | |
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477 int fd_msg_send_timeout ( struct msg ** pmsg, void (*anscb)(void *, struct msg **), void * data, const struct timespec *timeout ); |
0 | 478 |
479 /* | |
480 * FUNCTION: fd_msg_rescode_set | |
481 * | |
482 * PARAMETERS: | |
483 * msg : A msg object -- it must be an answer. | |
484 * rescode : The name of the returned error code (ex: "DIAMETER_INVALID_AVP") | |
485 * errormsg : (optional) human-readable error message to put in Error-Message AVP | |
486 * optavp : (optional) If provided, the content will be put inside a Failed-AVP | |
487 * type_id : 0 => nothing; 1 => adds Origin-Host and Origin-Realm with local info. 2=> adds Error-Reporting-Host. | |
488 * | |
489 * DESCRIPTION: | |
490 * This function adds a Result-Code AVP to a message, and optionally | |
491 * - sets the 'E' error flag in the header, | |
492 * - adds Error-Message, Error-Reporting-Host and Failed-AVP AVPs. | |
493 * | |
494 * RETURN VALUE: | |
495 * 0 : Operation complete. | |
496 * !0 : an error occurred. | |
497 */ | |
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498 int fd_msg_rescode_set( struct msg * msg, char * rescode, char * errormsg, struct avp * optavp, int type_id ); |
0 | 499 |
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500 /* Add Origin-Host, Origin-Realm, (if osi) Origin-State-Id AVPS at the end of the message */ |
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501 int fd_msg_add_origin ( struct msg * msg, int osi ); |
0 | 502 |
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503 /* Generate a new Session-Id and add it at the beginning of the message (opt is added at the end of the sid if provided) */ |
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504 int fd_msg_new_session( struct msg * msg, os0_t opt, size_t optlen ); |
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505 |
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506 |
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507 /* Parse a message against our dictionary, and in case of error log and eventually build the error reply (on return and EBADMSG, *msg == NULL or *msg is the error message ready to send) */ |
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508 int fd_msg_parse_or_error( struct msg ** msg ); |
0 | 509 |
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510 |
658
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511 |
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512 |
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513 /*============================================================*/ |
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514 /* DISPATCH */ |
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515 /*============================================================*/ |
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516 |
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517 /* |
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518 * FUNCTION: fd_disp_app_support |
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519 * |
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520 * PARAMETERS: |
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521 * app : The dictionary object corresponding to the Application. |
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522 * vendor : (Optional) the dictionary object of a Vendor to claim support in Vendor-Specific-Application-Id |
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523 * auth : Support auth app part. |
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524 * acct : Support acct app part. |
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525 * |
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526 * DESCRIPTION: |
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527 * Registers an application to be advertized in CER/CEA exchanges. |
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528 * Messages with an application-id matching a registered value are passed to the dispatch module, |
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529 * while other messages are simply relayed or an error is returned (if local node does not relay) |
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530 * |
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531 * RETURN VALUE: |
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532 * 0 : The application support is registered. |
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533 * EINVAL : A parameter is invalid. |
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534 */ |
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535 int fd_disp_app_support ( struct dict_object * app, struct dict_object * vendor, int auth, int acct ); |
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536 |
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537 /* Note: if we want to support capabilities updates, we'll have to add possibility to remove an app as well... */ |
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538 |
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539 |
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540 /*============================================================*/ |
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541 /* ROUTING */ |
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542 /*============================================================*/ |
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543 |
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544 /* This file contains the definitions of types and functions involved in the routing decisions in freeDiameter, |
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545 * and that can be called by extensions. |
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546 * |
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547 * Three different type of messages must be distinguished: |
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548 * - Messages received, and the peer is final recipient (IN messages) |
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549 * - Messages received, and the peer is not final recipient (FWD messages) |
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550 * - Message is locally generated (OUT messages) |
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551 * |
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552 * There are three global message queues (in queues.c) and also peers-specific queues (in struct fd_peer). |
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553 * |
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554 * (*) IN messages processing details: |
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555 * - the message is received from the remote peer, a FDEVP_CNX_MSG_RECV event is generated for the peer. |
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556 * - the PSM thread parses the buffer, does some verifications, handles non routable messages (fd_msg_is_routable) |
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557 * - routable messages are queued in the fd_g_incoming global queue. |
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558 * - a thread (routing-in) picks the message and takes the decision if it is handled locally or forwarded, |
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559 * based on local capabilities (registered by extensions with fd_disp_app_support). |
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560 * - If the message is handled locally, it is queued in fd_g_local. |
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561 * - Another thread (dispatch.c) will handle this message and pass it to registered callbacks (see fd_disp_register in libfreeDiameter.h). |
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562 * |
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563 * (*) FWD messages details: |
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564 * - The process is the same as for IN messages, until the routing-in threads makes its decision that the message is not handled locally. |
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565 * - If the local peer does not relay message, an error DIAMETER_APPLICATION_UNSUPPORTED is returned. |
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566 * - All callbacks registered with fd_rt_fwd_register are called for the message (see bellow). |
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567 * - these callbacks will typically do proxying work. Note that adding the route-record is handled by the daemon. |
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568 * - Once all callbacks have been called, the message is queued in the global fd_g_outgoing queue. |
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569 * - The remaining processing is the same as for OUT messages, as described bellow. |
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570 * |
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571 * (*) OUT messages details: |
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572 * - The message are picked from fd_g_outgoing (they are queued there as result of forwarding process or call to fd_msg_send.) |
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573 * - The (routing-out) thread builds a list of possible destinations for the message, as follow: |
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574 * - create a list of all known peers in the "OPEN" state. |
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575 * - remove from that list all peers that are in a Route-Record AVP of the message, to avoid routing loops. |
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576 * - remove also all peers that have previously replied an error message for this message. |
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577 * - If the list is empty, create an error UNABLE_TO_DELIVER (note: should we trig dynamic discovery here???) and reply. |
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578 * - Otherwise, call all callbacks registered by function fd_rt_out_register, with the list of peers and the message. |
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579 * - Order the resulting list of peers by score (see bellow), and sent the message to the peer with highest (positive) score. |
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580 * - in case the peer is no longer in the "OPEN" state, send the message to the second peer in the list. |
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581 * - if no peer is in OPEN state anymore, restart the process of creating the list. |
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582 * - Once a peer has been selected, the message is queued into that peer's outgoing queue. |
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583 * |
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584 * The following functions allow an extension to register or remove a callback as described above. |
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585 */ |
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586 |
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587 /********** Forwarding callbacks: for Proxy operations ***********/ |
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588 |
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589 /* Handle to registered callback */ |
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590 struct fd_rt_fwd_hdl; |
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591 |
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592 /* Message direction for the callback */ |
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593 enum fd_rt_fwd_dir { |
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594 RT_FWD_REQ = 1, /* The callback will be called on forwarded requests only */ |
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595 RT_FWD_ALL = 2, /* The callback will be called on all forwarded messages (requests and answers )*/ |
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596 RT_FWD_ANS = 3 /* The callback will be called on answers and errors only */ |
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597 }; |
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598 |
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599 /* |
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600 * FUNCTION: fd_rt_fwd_register |
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601 * |
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602 * PARAMETERS: |
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603 * rt_fwd_cb : The callback function to register (see prototype bellow). |
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604 * cbdata : Pointer to pass to the callback when it is called. The data is opaque to the daemon. |
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605 * dir : One of the RT_FWD_* directions defined above. |
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606 * handler : On success, a handler to the registered callback is stored here. |
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607 * This handler will be used to unregister the cb. |
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608 * |
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609 * DESCRIPTION: |
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610 * Register a new callback for forwarded messages. See explanations above. |
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611 * Note that there is no guaranteed order for the callbacks calls. |
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612 * |
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613 * RETURN VALUE: |
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614 * 0 : The callback is registered. |
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615 * EINVAL : A parameter is invalid. |
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616 * ENOMEM : Not enough memory to complete the operation |
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617 */ |
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618 int fd_rt_fwd_register ( int (*rt_fwd_cb)(void * cbdata, struct msg ** msg), void * cbdata, enum fd_rt_fwd_dir dir, struct fd_rt_fwd_hdl ** handler ); |
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619 /* |
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620 * CALLBACK: rt_fwd_cb |
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621 * |
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622 * PARAMETERS: |
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623 * data : pointer to some data that was passed when the callback was registered (optional). |
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624 * msg : The message that is being forwarded. |
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625 * |
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626 * DESCRIPTION: |
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627 * This callback is called when a message is forwarded to another peer. It may for example add a Proxy-Info AVP. |
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628 * The callback may also choose to handle the message in a more complex form. In that case, it must set *msg = NULL |
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629 * and handle it differently. In such case, the forwarding thread will stop processing this message. |
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630 * |
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631 * RETURN VALUE: |
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632 * 0 : Operation complete. |
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633 * !0 : An error occurred -- will result in daemon's termination. |
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634 */ |
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635 |
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636 /* |
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637 * FUNCTION: fd_rt_fwd_unregister |
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638 * |
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639 * PARAMETERS: |
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640 * handler : The handler of the callback that must be unregistered. |
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641 * cbdata : Will receive the data registered with the callback, that can be freed if needed. |
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642 * |
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643 * DESCRIPTION: |
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644 * Removes a callback from the list of registered callbacks. |
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645 * |
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646 * RETURN VALUE: |
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647 * 0 : The callback is unregistered. |
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648 * EINVAL : A parameter is invalid. |
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649 */ |
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650 int fd_rt_fwd_unregister ( struct fd_rt_fwd_hdl * handler, void ** cbdata ); |
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651 |
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652 |
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653 /********** Out callbacks: for next hop routing decision operations ***********/ |
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654 |
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655 /* Handle to registered callback */ |
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656 struct fd_rt_out_hdl; |
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657 |
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658 enum fd_rt_out_score { |
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659 FD_SCORE_NO_DELIVERY = -70, /* We should not send this message to this candidate */ |
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660 FD_SCORE_SENT_REDIRECT = -60, /* If this peer previously sent a Redirect indication that applies to this message */ |
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661 FD_SCORE_INI = -2, /* All candidates are initialized with this value */ |
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662 FD_SCORE_LOAD_BALANCE = 1, /* Use this to differentiate between several peers with the same score */ |
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663 FD_SCORE_DEFAULT = 5, /* The peer is a default route for all messages */ |
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664 FD_SCORE_DEFAULT_REALM = 10, /* The peer is a default route for this realm */ |
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665 FD_SCORE_REALM = 15, /* The peer belongs to Destination-Realm of the message */ |
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666 FD_SCORE_REDIR_HOST = 25, /* If there is a redirect rule with ALL_HOST for these message and peer */ |
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667 FD_SCORE_REDIR_APP = 30, /* If there is a redirect rule with ALL_APPLICATION for these message and peer */ |
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668 FD_SCORE_REDIR_REALM = 35, /* If there is a redirect rule with ALL_REALM for these message and peer */ |
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669 FD_SCORE_REDIR_REALM_APP = 40, /* If there is a redirect rule with REALM_AND_APPLICATION for these message and peer */ |
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670 FD_SCORE_REDIR_USER = 45, /* If there is a redirect rule with ALL_USER for these message and peer */ |
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671 FD_SCORE_REDIR_SESSION = 50, /* If there is a redirect rule with ALL_SESSION for these message and peer */ |
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672 FD_SCORE_REDIR_ONCE = 55, /* If there is a redirect rule with DONT_CACHE for these message and peer */ |
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673 FD_SCORE_FINALDEST = 100 /* If the peer is the final recipient of the message (i.e. matching Destination-Host), it receives a big score. */ |
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674 }; |
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675 |
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676 /* |
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677 * FUNCTION: fd_rt_out_register |
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678 * |
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679 * PARAMETERS: |
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680 * rt_out_cb : The callback function to register (see prototype bellow). |
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681 * cbdata : Pointer to pass to the callback when it is called. The data is opaque to the daemon. |
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682 * priority : Order for calling this callback. The callbacks are called in reverse priority order (higher priority = called sooner). |
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683 * handler : On success, a handler to the registered callback is stored here. |
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684 * This handler will be used to unregister the cb. |
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685 * |
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686 * DESCRIPTION: |
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687 * Register a new callback to handle OUT routing decisions. See explanations above. |
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688 * |
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689 * RETURN VALUE: |
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690 * 0 : The callback is registered. |
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691 * EINVAL : A parameter is invalid. |
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692 * ENOMEM : Not enough memory to complete the operation |
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693 */ |
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694 int fd_rt_out_register ( int (*rt_out_cb)(void * cbdata, struct msg * msg, struct fd_list * candidates), void * cbdata, int priority, struct fd_rt_out_hdl ** handler ); |
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695 /* |
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696 * CALLBACK: rt_out_cb |
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697 * |
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698 * PARAMETERS: |
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699 * cbdata : pointer to some data that was registered with the callback. |
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700 * msg : The message that must be sent. |
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701 * list : The list of peers to which the message may be sent to, as returned by fd_rtd_candidate_extract |
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702 * |
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703 * DESCRIPTION: |
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704 * This callback must attribute a score (preferably from FD_SCORE_*) to each candidate peer in the list. |
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705 * Once all registered callbacks have been called, the message is sent to the candidate with the highest score. |
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706 * Note that each callback must *add* its locally-attributed score to the candidate current "score" parameter, not replace it! |
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707 * Note also that this callback must be re-entrant since it may be called by several threads at the same time |
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708 * (for different messages) |
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709 * |
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710 * RETURN VALUE: |
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711 * 0 : Operation complete. |
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712 * !0 : An error occurred. |
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713 */ |
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714 |
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715 /* |
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716 * FUNCTION: fd_rt_out_unregister |
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717 * |
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718 * PARAMETERS: |
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719 * handler : The handler of the callback that must be unregistered. |
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720 * cbdata : Will receive the data registered with the callback, that can be freed if needed. |
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721 * |
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722 * DESCRIPTION: |
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723 * Removes a callback from the list of registered callbacks. |
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724 * |
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725 * RETURN VALUE: |
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726 * 0 : The callback is unregistered. |
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727 * EINVAL : A parameter is invalid. |
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728 */ |
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729 int fd_rt_out_unregister ( struct fd_rt_out_hdl * handler, void ** cbdata ); |
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730 |
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731 |
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732 /*============================================================*/ |
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733 /* EVENTS */ |
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734 /*============================================================*/ |
82 | 735 |
736 struct fd_event { | |
737 int code; /* codespace depends on the queue */ | |
738 size_t size; | |
739 void *data; | |
740 }; | |
741 | |
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742 /* Daemon's codespace: 1000->1999 (1500->1999 defined in fdcore-internal.h) */ |
82 | 743 enum { |
744 FDEV_TERMINATE = 1000 /* request to terminate */ | |
745 ,FDEV_DUMP_DICT /* Dump the content of the dictionary */ | |
746 ,FDEV_DUMP_EXT /* Dump state of extensions */ | |
747 ,FDEV_DUMP_SERV /* Dump the server socket status */ | |
748 ,FDEV_DUMP_QUEUES /* Dump the message queues */ | |
749 ,FDEV_DUMP_CONFIG /* Dump the configuration */ | |
750 ,FDEV_DUMP_PEERS /* Dump the list of peers */ | |
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751 ,FDEV_TRIGGER /* Trigger available for extensions. size is sizeof(int), data is int * */ |
82 | 752 }; |
753 | |
754 int fd_event_send(struct fifo *queue, int code, size_t datasz, void * data); | |
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755 int fd_event_get(struct fifo *queue, int * code, size_t * datasz, void ** data); |
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756 int fd_event_timedget(struct fifo *queue, struct timespec * timeout, int timeoutcode, int * code, size_t * datasz, void ** data); |
82 | 757 void fd_event_destroy(struct fifo **queue, void (*free_cb)(void * data)); |
758 const char * fd_ev_str(int event); | |
759 | |
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760 /* for extensions */ |
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761 int fd_event_trig_regcb(int trigger_val, const char * module, void (*cb)(void)); |
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762 void fd_event_trig_dump(); |
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763 |
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764 |
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765 /*============================================================*/ |
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766 /* ENDPOINTS */ |
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767 /*============================================================*/ |
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768 |
82 | 769 struct fd_endpoint { |
770 struct fd_list chain; /* link in cnf_endpoints list */ | |
771 | |
772 union { | |
773 sSS ss; /* the socket information. List is always ordered by ss value (memcmp) -- see fd_ep_add_merge */ | |
774 sSA4 sin; | |
775 sSA6 sin6; | |
776 sSA sa; | |
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777 } |
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778 #ifdef SWIG /* nested anonymous unions are not supported yet */ |
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779 s |
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780 #endif /* SWIG */ |
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781 ; |
82 | 782 |
783 #define EP_FL_CONF (1 << 0) /* This endpoint is statically configured in a configuration file */ | |
784 #define EP_FL_DISC (1 << 1) /* This endpoint was resolved from the Diameter Identity or other DNS query */ | |
785 #define EP_FL_ADV (1 << 2) /* This endpoint was advertized in Diameter CER/CEA exchange */ | |
786 #define EP_FL_LL (1 << 3) /* Lower layer mechanism provided this endpoint */ | |
787 #define EP_FL_PRIMARY (1 << 4) /* This endpoint is primary in a multihomed SCTP association */ | |
140 | 788 #define EP_ACCEPTALL (1 << 15) /* This flag allows bypassing the address filter in fd_ep_add_merge. */ |
82 | 789 uint32_t flags; /* Additional information about the endpoint */ |
790 | |
791 /* To add: a validity timestamp for DNS records ? How do we retrieve this lifetime from DNS ? */ | |
792 }; | |
793 | |
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794 int fd_ep_add_merge( struct fd_list * list, sSA * sa, socklen_t sl, uint32_t flags ); |
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795 int fd_ep_filter( struct fd_list * list, uint32_t flags ); |
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796 int fd_ep_filter_family( struct fd_list * list, int af ); |
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797 int fd_ep_filter_list( struct fd_list * list, struct fd_list * exclude_list ); |
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798 int fd_ep_clearflags( struct fd_list * list, uint32_t flags ); |
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799 void fd_ep_dump_one( char * prefix, struct fd_endpoint * ep, char * suffix ); |
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800 void fd_ep_dump( int indent, struct fd_list * eps ); |
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801 |
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802 |
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803 /*============================================================*/ |
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804 /* APPLICATIONS IDs */ |
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805 /*============================================================*/ |
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806 |
82 | 807 struct fd_app { |
808 struct fd_list chain; /* link in cnf_apps list. List ordered by appid. */ | |
809 struct { | |
810 unsigned auth : 1; | |
811 unsigned acct : 1; | |
812 } flags; | |
813 vendor_id_t vndid; /* if not 0, Vendor-Specific-App-Id AVP will be used */ | |
814 application_id_t appid; /* The identifier of the application */ | |
815 }; | |
816 | |
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817 int fd_app_merge(struct fd_list * list, application_id_t aid, vendor_id_t vid, int auth, int acct); |
87 | 818 int fd_app_check(struct fd_list * list, application_id_t aid, struct fd_app **detail); |
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819 int fd_app_check_common(struct fd_list * list1, struct fd_list * list2, int * common_found); |
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820 int fd_app_empty(struct fd_list * list); |
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821 |
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822 #endif /* _LIBFDCORE_H */ |