annotate extensions/rt_ignore_dh/rt_ignore_dh.c @ 1284:38e4a7c318ac

Fix a number of compilation warnings
author Sebastien Decugis <sdecugis@freediameter.net>
date Sun, 04 Jan 2015 00:55:57 +0800
parents 34265c9c1e94
children
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Thomas Klausner <tk@giga.or.at> *
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4 * *
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5 * Copyright (c) 2013, Thomas Klausner *
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6 * All rights reserved. *
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7 * *
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8 * Written under contract by nfotex IT GmbH, http://nfotex.com/ *
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9 * *
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10 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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11 * permitted provided that the following conditions are met: *
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12 * *
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13 * * Redistributions of source code must retain the above *
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14 * copyright notice, this list of conditions and the *
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15 * following disclaimer. *
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16 * *
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17 * * Redistributions in binary form must reproduce the above *
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18 * copyright notice, this list of conditions and the *
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19 * following disclaimer in the documentation and/or other *
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20 * materials provided with the distribution. *
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21 * *
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22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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24 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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25 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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28 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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30 *********************************************************************************************************/
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31
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32 #include <freeDiameter/extension.h>
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33
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34 /*
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35 * Remove Destination-Hosts, putting it into Proxy-Info, and restore it to
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36 * Origin-Host for answers.
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37 */
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38
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39 struct dict_object * dh_avp_do; /* cache the Destination-Host dictionary object */
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40 struct dict_object * oh_avp_do; /* cache the Origin-Host dictionary object */
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41 struct dict_object * ph_avp_do; /* cache the Proxy-Host dictionary object */
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42 struct dict_object * pi_avp_do; /* cache the Proxy-Info dictionary object */
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43 struct dict_object * ps_avp_do; /* cache the Proxy-State dictionary object */
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44
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45 static int restore_origin_host(struct msg **msg) {
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46 struct avp *avp, *child;
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47 struct avp *oh_avp = NULL;
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48 struct avp *pi_avp = NULL;
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49 void *ps, *new_oh;
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50 size_t ps_len, new_oh_len = 0;
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51 union avp_value val;
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52
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53 ps = new_oh = NULL;
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54
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55 CHECK_FCT(fd_msg_browse(*msg, MSG_BRW_FIRST_CHILD, &avp, NULL));
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56 /* look for Origin-Host and Proxy-Info matching this host */
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57 while (avp && (!oh_avp || !pi_avp)) {
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58 struct avp_hdr * ahdr;
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59 int match = 0;
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60
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61 CHECK_FCT(fd_msg_avp_hdr(avp, &ahdr));
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62 if (!(ahdr->avp_flags & AVP_FLAG_VENDOR)) {
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63 switch (ahdr->avp_code) {
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64 case AC_ORIGIN_HOST:
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65 oh_avp = avp;
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66 CHECK_FCT(fd_msg_parse_dict(oh_avp, fd_g_config->cnf_dict, NULL));
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67 break;
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68 case AC_PROXY_INFO:
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69 ps = NULL;
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70 ps_len = 0;
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71 CHECK_FCT(fd_msg_parse_dict(avp, fd_g_config->cnf_dict, NULL));
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72 CHECK_FCT(fd_msg_browse(avp, MSG_BRW_FIRST_CHILD, &child, NULL));
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73 while (child && (!match || !ps)) {
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74 struct avp_hdr *chdr;
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75 CHECK_FCT(fd_msg_avp_hdr(child, &chdr));
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76 if (!(chdr->avp_flags & AVP_FLAG_VENDOR)) {
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77 switch (chdr->avp_code) {
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78 case AC_PROXY_HOST:
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79 if (fd_os_cmp(chdr->avp_value->os.data, chdr->avp_value->os.len,
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80 fd_g_config->cnf_diamid, fd_g_config->cnf_diamid_len) == 0) {
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81 match = 1;
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82 }
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83 break;
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84 case AC_PROXY_STATE:
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85 ps = chdr->avp_value->os.data;
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86 ps_len = chdr->avp_value->os.len;
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87 break;
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88 default:
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89 break;
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90 }
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91 }
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92 CHECK_FCT(fd_msg_browse(child, MSG_BRW_NEXT, &child, NULL));
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93 }
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94 if (match && ps) {
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95 new_oh = ps;
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96 new_oh_len = ps_len;
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97 pi_avp = avp;
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98 }
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99 break;
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100 default:
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101 break;
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102 }
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103 }
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104 CHECK_FCT(fd_msg_browse(avp, MSG_BRW_NEXT, &avp, NULL));
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105 }
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106 if (!pi_avp)
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107 return 0;
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108
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109 memset(&val, 0, sizeof(val));
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110 val.os.data = new_oh;
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111 val.os.len = new_oh_len;
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112 if (!oh_avp) {
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113 TRACE_ERROR("Message contained no Origin-Host");
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114 } else {
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115 CHECK_FCT(fd_msg_avp_setvalue(oh_avp, &val));
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116 }
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117 fd_msg_free((msg_or_avp*)pi_avp);
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118
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119 fd_log_debug("Restored Origin-Host '%.*s' from Proxy-Info", (int)new_oh_len, (char *)new_oh);
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120 return 0;
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121 }
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122
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123 static int stow_destination_host(struct msg **msg) {
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124 struct avp * avp = NULL;
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125 struct avp * ph_avp = NULL;
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126 struct avp * pi_avp = NULL;
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127 struct avp * ps_avp = NULL;
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128
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129 /* Look for the Destination-Host AVP in the message */
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130 CHECK_FCT(fd_msg_search_avp(*msg, dh_avp_do, &avp));
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131 if (avp != NULL) {
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132 struct avp_hdr * ahdr = NULL;
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133 union avp_value val;
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134
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135 CHECK_FCT(fd_msg_avp_hdr(avp, &ahdr));
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136 if (ahdr->avp_value != NULL) {
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137 /* add Proxy-Info->{Proxy-Host, Proxy-State} using Destination-Host information */
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138 CHECK_FCT(fd_msg_avp_new(ph_avp_do, 0, &ph_avp));
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139 memset(&val, 0, sizeof(val));
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140 val.os.data = (uint8_t *)(fd_g_config->cnf_diamid);
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141 val.os.len = fd_g_config->cnf_diamid_len;
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142 CHECK_FCT(fd_msg_avp_setvalue(ph_avp, &val));
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143
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144 CHECK_FCT(fd_msg_avp_new(ps_avp_do, 0, &ps_avp));
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145 memset(&val, 0, sizeof(val));
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146 val.os.data = ahdr->avp_value->os.data;
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147 val.os.len = ahdr->avp_value->os.len;
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148 CHECK_FCT(fd_msg_avp_setvalue(ps_avp, &val));
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149
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150 CHECK_FCT(fd_msg_avp_new(pi_avp_do, 0, &pi_avp));
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151 CHECK_FCT(fd_msg_avp_add(pi_avp, MSG_BRW_LAST_CHILD, ph_avp));
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152 CHECK_FCT(fd_msg_avp_add(pi_avp, MSG_BRW_LAST_CHILD, ps_avp));
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153
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154 /* remove Destination-Host from message */
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155 fd_msg_free((msg_or_avp*)avp);
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156 /* add Proxy-Info */
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157 CHECK_FCT(fd_msg_avp_add(*msg, MSG_BRW_LAST_CHILD, pi_avp));
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158 fd_log_debug("Stowed Destination-Host '%.*s' into Proxy-Info", (int)val.os.len, (const char *)val.os.data);
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159 }
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160 }
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161
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162 return 0;
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163 }
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164
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165 /* The callback for putting Destination-Host into Proxy-Info and restoring it on the way back */
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166 static int rt_ignore_destination_host(void * cbdata, struct msg **msg) {
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167 struct msg_hdr * hdr;
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168 int ret;
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169
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170 TRACE_ENTRY("%p %p", cbdata, msg);
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171
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172 CHECK_PARAMS(msg && *msg);
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173
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174 /* Read the message header */
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175 CHECK_FCT(fd_msg_hdr(*msg, &hdr));
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176 if (hdr->msg_flags & CMD_FLAG_REQUEST) {
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177 ret = stow_destination_host(msg);
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178 } else {
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179 ret = restore_origin_host(msg);
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180 }
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181
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182 return ret;
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183 }
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184
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185 /* handler */
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186 static struct fd_rt_fwd_hdl * rt_ignore_destination_host_hdl = NULL;
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187
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188 /* entry point */
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189 static int rt_ignore_destination_host_entry(char * conffile)
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190 {
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191 CHECK_FCT_DO(fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Destination-Host", &dh_avp_do, ENOENT),
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192 { TRACE_ERROR("Unable to find 'Destination-Host' AVP in the loaded dictionaries."); });
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193 CHECK_FCT_DO(fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Origin-Host", &oh_avp_do, ENOENT),
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194 { TRACE_ERROR("Unable to find 'Origin-Host' AVP in the loaded dictionaries."); });
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195 CHECK_FCT_DO(fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Proxy-Host", &ph_avp_do, ENOENT),
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196 { TRACE_ERROR("Unable to find 'Proxy-Host' AVP in the loaded dictionaries."); });
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197 CHECK_FCT_DO(fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Proxy-Info", &pi_avp_do, ENOENT),
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198 { TRACE_ERROR("Unable to find 'Proxy-Info' AVP in the loaded dictionaries."); });
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199 CHECK_FCT_DO(fd_dict_search(fd_g_config->cnf_dict, DICT_AVP, AVP_BY_NAME, "Proxy-State", &ps_avp_do, ENOENT),
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200 { TRACE_ERROR("Unable to find 'Proxy-State' AVP in the loaded dictionaries."); });
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201
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202 /* Register the callback */
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203 CHECK_FCT(fd_rt_fwd_register(rt_ignore_destination_host, NULL, RT_FWD_ALL, &rt_ignore_destination_host_hdl));
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204
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205 TRACE_DEBUG(INFO, "Extension 'Ignore Destination Host' initialized");
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206 return 0;
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207 }
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208
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209 /* Unload */
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210 void fd_ext_fini(void)
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211 {
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212 /* Unregister the callbacks */
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213 CHECK_FCT_DO(fd_rt_fwd_unregister(rt_ignore_destination_host_hdl, NULL), /* continue */);
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214 return ;
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215 }
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216
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217 EXTENSION_ENTRY("rt_ignore_destination_host", rt_ignore_destination_host_entry);
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