Mercurial > hg > freeDiameter

annotate extensions/app_radgw/rgw_msg.c @ 255:cb4307a1cd29

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Added two plugins for RADIUS/Diameter gateway debug.
author Sebastien Decugis <sdecugis@nict.go.jp>
date Thu, 15 Apr 2010 11:56:32 +0900
parents a857024cb48b
children 5df55136361b
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254
a857024cb48b Ported the RADIUS/Diameter translation code from waaad project. Not tested yet. Gateway plugins to come later.
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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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5 * Copyright (c) 2009, 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 /* This file contains all support functions to parse, create, and manipulate RADIUS messages. Other
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37 modules do not need to "know" the actual representation of RADIUS messages on the network. They only
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38 receive the logical view as exposed in the rgw.h file. This file extends the content of the radius.c
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39 file functions (from hostap project).*/
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40
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41 #include "rgw.h"
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42
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43 /* Destroy a message */
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44 void rgw_msg_free(struct rgw_radius_msg_meta ** msg)
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45 {
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46 if (!msg || !*msg)
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47 return;
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48
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49 radius_msg_free(&(*msg)->radius);
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50 free(*msg);
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51 *msg = NULL;
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52 }
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53
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54 /* This function creates a rgw_radius_msg_meta structure after parsing a RADIUS buffer */
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55 int rgw_msg_parse(unsigned char * buf, size_t len, struct rgw_radius_msg_meta ** msg)
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56 {
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57 struct radius_msg * temp_msg = NULL;
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58
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59 TRACE_ENTRY("%p %g %p", buf, len, msg);
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60
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61 CHECK_PARAMS( buf && len && msg );
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62
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63 *msg = NULL;
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64
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65 /* Parse the RADIUS message */
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66 temp_msg = radius_msg_parse(buf, len);
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67 if (temp_msg == NULL) {
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68 TRACE_DEBUG(INFO, "Error parsing the RADIUS message, discarding");
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69 return EINVAL;
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70 }
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71
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72 /* Now alloc space for the meta-data */
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73 CHECK_MALLOC( *msg = realloc(temp_msg, sizeof(struct rgw_radius_msg_meta)) );
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74
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75 /* Clear memory after the parsed data */
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76 memset( &(*msg)->radius + 1, 0, sizeof(struct rgw_radius_msg_meta) - sizeof(struct radius_msg) );
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77
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78 return 0;
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79 }
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80
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81 /* Check if the message has a valid authenticator, and update the meta-data accordingly */
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82 int rgw_msg_auth_check(struct rgw_radius_msg_meta * msg, struct rgw_client * cli, uint8_t * req_auth)
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83 {
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84 unsigned char * key;
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85 size_t keylen;
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86 int count;
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87
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88 TRACE_ENTRY("%p %p %p", msg, cli, req_auth);
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89
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90 CHECK_PARAMS(msg && cli);
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91
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92 CHECK_FCT(rgw_clients_getkey(cli, &key, &keylen));
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93
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94 count = radius_msg_count_attr(&msg->radius, RADIUS_ATTR_MESSAGE_AUTHENTICATOR, 0);
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95 if (count > 1) {
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96 TRACE_DEBUG(INFO, "Too many Message-Authenticator attributes (%d), discarding message.", count);
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97 return EINVAL;
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98 }
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99 if (count == 0) {
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100 TRACE_DEBUG(FULL, "Message does not contain a Message-Authenticator attributes.");
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101 msg->valid_mac = 0;
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102 } else {
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103 if (radius_msg_verify_msg_auth( &msg->radius, key, keylen, req_auth )) {
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104 TRACE_DEBUG(INFO, "Invalid Message-Authenticator received, discarding message.");
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105 return EINVAL;
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106 }
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107 msg->valid_mac = 1;
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108 }
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109
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110 return 0;
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111 }
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112
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113 /* Dump a message (inspired from radius_msg_dump) -- can be used safely with a struct radius_msg as parameter (we don't dump the metadata) */
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114 void rgw_msg_dump(struct rgw_radius_msg_meta * msg)
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115 {
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116 unsigned char *auth;
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117 size_t i;
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118 if (! TRACE_BOOL(FULL) )
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119 return;
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120
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121 auth = &(msg->radius.hdr->authenticator[0]);
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122
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123 fd_log_debug("------ RADIUS msg dump -------\n");
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124 fd_log_debug(" id : 0x%02hhx, code : %hhd (%s)\n", msg->radius.hdr->identifier, msg->radius.hdr->code, rgw_msg_code_str(msg->radius.hdr->code));
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125 fd_log_debug(" auth: %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx\n",
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126 auth[0], auth[1], auth[2], auth[3],
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127 auth[4], auth[5], auth[6], auth[7]);
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128 fd_log_debug(" %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx %02hhx\n",
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129 auth[8], auth[9], auth[10], auth[11],
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130 auth[12], auth[13], auth[14], auth[15]);
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131 for (i = 0; i < msg->radius.attr_used; i++) {
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132 struct radius_attr_hdr *attr = (struct radius_attr_hdr *)(msg->radius.buf + msg->radius.attr_pos[i]);
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133 fd_log_debug(" - len:%3hhu, type:0x%02hhx (%s)\n", attr->length, attr->type, rgw_msg_attrtype_str(attr->type));
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134 /* If we need to dump the value, it's better to call directly radius_msg_dump instead... */
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135 }
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136 fd_log_debug("-----------------------------\n");
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137 }
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138
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139 static struct dict_object * cache_sess_id = NULL;
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140 static struct dict_object * cache_dest_host = NULL;
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141 static struct dict_object * cache_dest_realm = NULL;
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142 static struct dict_object * cache_orig_host = NULL;
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143 static struct dict_object * cache_orig_realm = NULL;
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144
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145 int rgw_msg_init(void)
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146 {
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147 TRACE_ENTRY();
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148 CHECK_FCT( fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Session-Id", &cache_sess_id, ENOENT) );
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149 CHECK_FCT( fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Destination-Host", &cache_dest_host, ENOENT) );
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150 CHECK_FCT( fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Destination-Realm", &cache_dest_realm, ENOENT) );
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151 CHECK_FCT( fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Origin-Host", &cache_orig_host, ENOENT) );
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152 CHECK_FCT( fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Origin-Realm", &cache_orig_realm, ENOENT) );
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153 return 0;
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154 }
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155
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156 /* Create a msg with origin-host & realm, and session-id, and a session object from a RADIUS request message */
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157 int rgw_msg_create_base(struct rgw_radius_msg_meta * msg, struct rgw_client * cli, struct session ** session, struct msg ** diam)
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158 {
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159 int idx, i;
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160 const char * prefix = "Diameter/";
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161 size_t pref_len;
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162 char * dh = NULL;
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163 size_t dh_len = 0;
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164 char * dr = NULL;
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165 size_t dr_len = 0;
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166 char * si = NULL;
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167 size_t si_len = 0;
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168 char * un = NULL;
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169 size_t un_len = 0;
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170
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171 char * fqdn;
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172 char * realm;
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173 char * sess_str = NULL;
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174
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175 struct avp *avp = NULL;
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176 union avp_value avp_val;
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177
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178 TRACE_ENTRY("%p %p %p %p", msg, cli, session, diam);
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179 CHECK_PARAMS( msg && cli && session && (*session == NULL) && diam && (*diam == NULL) );
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180
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181 pref_len = strlen(prefix);
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182
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183 /* Is there a State attribute with prefix "Diameter/" in the message? (in that case: Diameter/Destination-Host/Destination-Realm/Session-Id) */
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184 /* NOTE: RFC4005 says "Origin-Host" here, but it's not coherent with the rules for answers. Destination-Host makes more sense */
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185 /* Is there a Class attribute with prefix "Diameter/" in the message? (in that case: Diameter/Session-Id) */
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186 for (idx = 0; idx < msg->radius.attr_used; idx++) {
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187 struct radius_attr_hdr * attr = (struct radius_attr_hdr *)(msg->radius.buf + msg->radius.attr_pos[idx]);
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188 char * attr_val = (char *)(attr + 1);
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189 size_t attr_len = attr->length - sizeof(struct radius_attr_hdr);
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190
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191 if ((attr->type == RADIUS_ATTR_USER_NAME)
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192 && attr_len) {
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193 TRACE_DEBUG(ANNOYING, "Found a User-Name attribute: '%.*s'", attr_len, attr_val);
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194 un = attr_val;
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195 un_len = attr_len;
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196 continue;
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diff changeset
197 }
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diff changeset
198
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diff changeset
199 if ((attr->type == RADIUS_ATTR_STATE)
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diff changeset
200 && (attr_len > pref_len + 5 /* for the '/'s and non empty strings */ )
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diff changeset
201 && ! strncmp(attr_val, prefix, pref_len)) { /* should we make it strncasecmp? */
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parents:
diff changeset
202 int i, start;
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diff changeset
203
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diff changeset
204 TRACE_DEBUG(ANNOYING, "Found a State attribute with '%s' prefix (attr #%d).", prefix, idx);
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diff changeset
205
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diff changeset
206 /* Now parse the value and check its content is valid. Unfortunately we cannot use strchr here since strings are not \0-terminated */
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diff changeset
207
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diff changeset
208 i = start = pref_len;
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diff changeset
209 dh = attr_val + i;
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diff changeset
210 for (; (i < attr_len - 2) && (attr_val[i] != '/'); i++) /* loop */;
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diff changeset
211 if ( i >= attr_len - 2 ) continue; /* the attribute format is not good */
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diff changeset
212 dh_len = i - start;
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diff changeset
213
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diff changeset
214 start = ++i;
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diff changeset
215 dr = attr_val + i;
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diff changeset
216 for (; (i < attr_len - 1) && (attr_val[i] != '/'); i++) /* loop */;
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diff changeset
217 if ( i >= attr_len - 1 ) continue; /* the attribute format is not good */
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diff changeset
218 dr_len = i - start;
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219
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diff changeset
220 i++;
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diff changeset
221 si = attr_val + i;
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diff changeset
222 si_len = attr_len - i;
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223
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diff changeset
224 TRACE_DEBUG(ANNOYING, "Attribute parsed successfully: DH:'%.*s' DR:'%.*s' SI:'%.*s'.", dh_len, dh, dr_len, dr, si_len, si);
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diff changeset
225 /* Remove from the message */
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diff changeset
226 for (i = idx + 1; i < msg->radius.attr_used; i++)
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diff changeset
227 msg->radius.attr_pos[i - 1] = msg->radius.attr_pos[i];
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diff changeset
228 msg->radius.attr_used -= 1;
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diff changeset
229 break;
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diff changeset
230 }
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diff changeset
231
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diff changeset
232 if ((attr->type == RADIUS_ATTR_CLASS)
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diff changeset
233 && (attr_len > pref_len )
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diff changeset
234 && ! strncmp(attr_val, prefix, pref_len)) {
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diff changeset
235 si = attr_val + pref_len;
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diff changeset
236 si_len = attr_len - pref_len;
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diff changeset
237 TRACE_DEBUG(ANNOYING, "Found Class attribute with '%s' prefix (attr #%d), SI:'%.*s'.", prefix, idx, si_len, si);
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diff changeset
238 /* Remove from the message */
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parents:
diff changeset
239 for (i = idx + 1; i < msg->radius.attr_used; i++)
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diff changeset
240 msg->radius.attr_pos[i - 1] = msg->radius.attr_pos[i];
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diff changeset
241 msg->radius.attr_used -= 1;
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diff changeset
242 break;
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diff changeset
243 }
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diff changeset
244
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diff changeset
245 }
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diff changeset
246
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diff changeset
247 /* Get information on this peer */
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diff changeset
248 CHECK_FCT( rgw_clients_get_origin(cli, &fqdn, &realm) );
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diff changeset
249
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diff changeset
250 /* Create the session object */
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diff changeset
251 if (si_len) {
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diff changeset
252 CHECK_FCT( fd_sess_fromsid ( si, si_len, session, &idx) );
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diff changeset
253 } else {
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diff changeset
254 if (un) {
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diff changeset
255 int len;
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diff changeset
256 /* If not found, create a new Session-Id. The format is: {fqdn;hi32;lo32;username;diamid} */
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diff changeset
257 CHECK_MALLOC( sess_str = malloc(un_len + 1 /* ';' */ + fd_g_config->cnf_diamid_len + 1 /* '\0' */) );
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diff changeset
258 len = sprintf(sess_str, "%.*s;%s", un_len, un, fd_g_config->cnf_diamid);
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diff changeset
259 CHECK_FCT( fd_sess_new(session, fqdn, sess_str, len) );
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diff changeset
260 free(sess_str);
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diff changeset
261 idx = 1;
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diff changeset
262 }
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diff changeset
263 }
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diff changeset
264
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parents:
diff changeset
265 /* Create an empty Diameter message so that extensions can store their AVPs */
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parents:
diff changeset
266 CHECK_FCT( fd_msg_new ( NULL, MSGFL_ALLOC_ETEID, diam ) );
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diff changeset
267
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parents:
diff changeset
268 if (*session) {
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diff changeset
269 CHECK_FCT( fd_sess_getsid(*session, &sess_str) );
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parents:
diff changeset
270 TRACE_DEBUG(FULL, "Session '%s' has been successfully %s.", sess_str, idx ? "created" : "retrieved");
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diff changeset
271
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parents:
diff changeset
272 /* Add the Session-Id AVP as first AVP */
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diff changeset
273 CHECK_FCT( fd_msg_avp_new ( cache_sess_id, 0, &avp ) );
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parents:
diff changeset
274 memset(&avp_val, 0, sizeof(avp_val));
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diff changeset
275 avp_val.os.data = (unsigned char *)sess_str;
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diff changeset
276 avp_val.os.len = strlen(sess_str);
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diff changeset
277 CHECK_FCT( fd_msg_avp_setvalue ( avp, &avp_val ) );
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parents:
diff changeset
278 CHECK_FCT( fd_msg_avp_add ( *diam, MSG_BRW_FIRST_CHILD, avp) );
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diff changeset
279
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diff changeset
280 } else {
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diff changeset
281 TRACE_DEBUG(FULL, "No session has been created for this message");
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diff changeset
282 }
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diff changeset
283
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diff changeset
284 /* Add the Destination-Realm as next AVP */
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parents:
diff changeset
285 CHECK_FCT( fd_msg_avp_new ( cache_dest_realm, 0, &avp ) );
a857024cb48b Ported the RADIUS/Diameter translation code from waaad project. Not tested yet. Gateway plugins to come later.
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parents:
diff changeset
286 memset(&avp_val, 0, sizeof(avp_val));
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parents:
diff changeset
287 if (dr) {
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diff changeset
288 avp_val.os.data = (unsigned char *)dr;
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parents:
diff changeset
289 avp_val.os.len = dr_len;
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parents:
diff changeset
290 } else {
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parents:
diff changeset
291 int i = 0;
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parents:
diff changeset
292 if (un) {
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parents:
diff changeset
293 /* Is there an '@' in the user name? We don't care for decorated NAI here */
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Sebastien Decugis <sdecugis@nict.go.jp>
parents:
diff changeset
294 for (i = un_len - 2; i > 0; i--) {
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parents:
diff changeset
295 if (un[i] == '@') {
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diff changeset
296 i++;
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297 break;
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298 }
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299 }
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300 }
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301 if (i == 0) {
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302 /* Not found in the User-Name => we use the local domain of this gateway */
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303 avp_val.os.data = fd_g_config->cnf_diamrlm;
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304 avp_val.os.len = fd_g_config->cnf_diamrlm_len;
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305 } else {
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306 avp_val.os.data = un + i;
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307 avp_val.os.len = un_len - i;
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308 }
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309 }
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310 CHECK_FCT( fd_msg_avp_setvalue ( avp, &avp_val ) );
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311 CHECK_FCT( fd_msg_avp_add ( *diam, MSG_BRW_LAST_CHILD, avp) );
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312
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313 /* Add the Destination-Host as next AVP */
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diff changeset
314 if (dh) {
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315 CHECK_FCT( fd_msg_avp_new ( cache_dest_host, 0, &avp ) );
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diff changeset
316 memset(&avp_val, 0, sizeof(avp_val));
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diff changeset
317 avp_val.os.data = (unsigned char *)dh;
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diff changeset
318 avp_val.os.len = dh_len;
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319 CHECK_FCT( fd_msg_avp_setvalue ( avp, &avp_val ) );
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diff changeset
320 CHECK_FCT( fd_msg_avp_add ( *diam, MSG_BRW_LAST_CHILD, avp) );
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321 }
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322
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diff changeset
323 /* Add the Origin-Host as next AVP */
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diff changeset
324 CHECK_FCT( fd_msg_avp_new ( cache_orig_host, 0, &avp ) );
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diff changeset
325 memset(&avp_val, 0, sizeof(avp_val));
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diff changeset
326 avp_val.os.data = (unsigned char *)fqdn;
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diff changeset
327 avp_val.os.len = strlen(fqdn);
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diff changeset
328 CHECK_FCT( fd_msg_avp_setvalue ( avp, &avp_val ) );
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diff changeset
329 CHECK_FCT( fd_msg_avp_add ( *diam, MSG_BRW_LAST_CHILD, avp) );
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parents:
diff changeset
330
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diff changeset
331 /* Add the Origin-Realm as next AVP */
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diff changeset
332 CHECK_FCT( fd_msg_avp_new ( cache_orig_realm, 0, &avp ) );
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parents:
diff changeset
333 memset(&avp_val, 0, sizeof(avp_val));
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parents:
diff changeset
334 avp_val.os.data = (unsigned char *)realm;
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parents:
diff changeset
335 avp_val.os.len = strlen(realm);
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parents:
diff changeset
336 CHECK_FCT( fd_msg_avp_setvalue ( avp, &avp_val ) );
a857024cb48b Ported the RADIUS/Diameter translation code from waaad project. Not tested yet. Gateway plugins to come later.
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parents:
diff changeset
337 CHECK_FCT( fd_msg_avp_add ( *diam, MSG_BRW_LAST_CHILD, avp) );
a857024cb48b Ported the RADIUS/Diameter translation code from waaad project. Not tested yet. Gateway plugins to come later.
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parents:
diff changeset
338
a857024cb48b Ported the RADIUS/Diameter translation code from waaad project. Not tested yet. Gateway plugins to come later.
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parents:
diff changeset
339 /* Done! */
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diff changeset
340 return 0;
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parents:
diff changeset
341 }
"Welcome to our mercurial repository"