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annotate libfdproto/dictionary_functions.c @ 1033:000e1904074c

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Fix a number of additional warnings
author Sebastien Decugis <sdecugis@freediameter.net>
date Tue, 16 Apr 2013 11:45:52 +0800
parents e63de8d76916
children 2f989d1a21e9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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c7bf1a7a4e90 Split the encoders/interpreters for the dictionary types into a different file for better reusability, add decoder/interpreter for Time type based on code from Thomas Klausner
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@freediameter.net> *
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4 * *
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5 * Copyright (c) 2013, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * permitted provided that the following conditions are met: *
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10 * *
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11 * * Redistributions of source code must retain the above *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 #include "fdproto-internal.h"
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37
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38 /* This file contains helpers functions to be reused as callbacks in the struct dict_type_data structure.
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39 There are three callbacks there:
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40
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41 - type_encode :
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42 - type_interpret :
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43 Those two callbacks allow to manipulate more natural structures of data in the code, and to
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44 map transparently these natural structures with the AVP-encoded format by calling the functions
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45 msg_avp_value_encode or msg_avp_value_interpret.
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46 - type_dump :
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47 This callback if provided gives a more human-readable debug information.
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48
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49 */
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50
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51 /****************************/
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52 /* Address AVP type */
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53 /****************************/
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54
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55 /* The interpret and encode functions work with a "struct sockaddr_storage" pointer for mapping
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56 the contents of the AVP */
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57
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58 int fd_dictfct_Address_encode(void * data, union avp_value * avp_value)
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59 {
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60 sSS * ss = (sSS *) data;
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61 uint16_t AddressType = 0;
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62 size_t size = 0;
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63 unsigned char * buf = NULL;
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64
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65 TRACE_ENTRY("%p %p", data, avp_value);
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66 CHECK_PARAMS( data && avp_value );
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67
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68 switch (ss->ss_family) {
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69 case AF_INET:
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70 {
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71 /* We are encoding an IP address */
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72 sSA4 * sin = (sSA4 *)ss;
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73
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74 AddressType = 1;/* see http://www.iana.org/assignments/address-family-numbers/ */
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75 size = 6; /* 2 for AddressType + 4 for data */
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76
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77 CHECK_MALLOC( buf = malloc(size) );
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78
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79 /* may not work because of alignment: *(uint32_t *)(buf+2) = htonl(sin->sin_addr.s_addr); */
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80 memcpy(buf + 2, &sin->sin_addr.s_addr, 4);
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81 }
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82 break;
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83
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84 case AF_INET6:
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85 {
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86 /* We are encoding an IPv6 address */
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87 sSA6 * sin6 = (sSA6 *)ss;
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88
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89 AddressType = 2;/* see http://www.iana.org/assignments/address-family-numbers/ */
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90 size = 18; /* 2 for AddressType + 16 for data */
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91
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92 CHECK_MALLOC( buf = malloc(size) );
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93
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94 /* The order is already good here */
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95 memcpy(buf + 2, &sin6->sin6_addr.s6_addr, 16);
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96 }
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97 break;
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98
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99 default:
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100 CHECK_PARAMS( AddressType = 0 );
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101 }
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102
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103 *(uint16_t *)buf = htons(AddressType);
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104
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105 avp_value->os.len = size;
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106 avp_value->os.data = buf;
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107
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108 return 0;
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109 }
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110
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111 int fd_dictfct_Address_interpret(union avp_value * avp_value, void * interpreted)
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112 {
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113 uint16_t AddressType = 0;
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114 unsigned char * buf;
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115
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116 TRACE_ENTRY("%p %p", avp_value, interpreted);
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117
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118 CHECK_PARAMS( avp_value && interpreted && (avp_value->os.len >= 2) );
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119
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120 AddressType = ntohs(*(uint16_t *)avp_value->os.data);
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121 buf = &avp_value->os.data[2];
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122
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123 switch (AddressType) {
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124 case 1 /* IP */:
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125 {
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126 sSA4 * sin = (sSA4 *)interpreted;
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127
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128 CHECK_PARAMS( avp_value->os.len == 6 );
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129
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130 sin->sin_family = AF_INET;
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131 /* sin->sin_addr.s_addr = ntohl( * (uint32_t *) buf); -- may not work because of bad alignment */
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132 memcpy(&sin->sin_addr.s_addr, buf, 4);
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133 }
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134 break;
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135
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136 case 2 /* IP6 */:
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137 {
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138 sSA6 * sin6 = (sSA6 *)interpreted;
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139
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140 CHECK_PARAMS( avp_value->os.len == 18 );
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141
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142 sin6->sin6_family = AF_INET6;
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143 memcpy(&sin6->sin6_addr.s6_addr, buf, 16);
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144 }
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145 break;
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146
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147 default:
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148 CHECK_PARAMS( AddressType = 0 );
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149 }
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150
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151 return 0;
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152 }
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153
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154 /* Dump the content of an Address AVP */
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155 char * fd_dictfct_Address_dump(union avp_value * avp_value)
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156 {
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157 char * ret;
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158 #define STR_LEN 1024
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159 union {
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160 sSA sa;
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161 sSS ss;
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162 sSA4 sin;
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163 sSA6 sin6;
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164 } s;
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165 uint16_t fam;
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166
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167 memset(&s, 0, sizeof(s));
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168
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169 CHECK_MALLOC_DO( ret = malloc(STR_LEN), return NULL );
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170
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171 /* The first two octets represent the address family, http://www.iana.org/assignments/address-family-numbers/ */
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172 if (avp_value->os.len < 2) {
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173 snprintf(ret, STR_LEN, "[invalid length: %zd]", avp_value->os.len);
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174 return ret;
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175 }
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176
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177 /* Following octets are the address in network byte order already */
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178 fam = avp_value->os.data[0] << 8 | avp_value->os.data[1];
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179 switch (fam) {
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180 case 1:
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181 /* IP */
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182 s.sa.sa_family = AF_INET;
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183 if (avp_value->os.len != 6) {
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184 snprintf(ret, STR_LEN, "[invalid IP length: %zd]", avp_value->os.len);
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185 return ret;
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186 }
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187 memcpy(&s.sin.sin_addr.s_addr, avp_value->os.data + 2, 4);
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188 break;
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189 case 2:
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190 /* IP6 */
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191 s.sa.sa_family = AF_INET6;
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192 if (avp_value->os.len != 18) {
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193 snprintf(ret, STR_LEN, "[invalid IP6 length: %zd]", avp_value->os.len);
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194 return ret;
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195 }
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196 memcpy(&s.sin6.sin6_addr.s6_addr, avp_value->os.data + 2, 16);
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197 break;
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198 default:
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199 snprintf(ret, STR_LEN, "[unsupported family: 0x%hx]", fam);
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200 return ret;
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201 }
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202
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203 {
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204 int rc = getnameinfo(&s.sa, sSAlen(&s.sa), ret, STR_LEN, NULL, 0, NI_NUMERICHOST);
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205 if (rc)
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206 snprintf(ret, STR_LEN, "%s", (char *)gai_strerror(rc));
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207 }
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208
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209 return ret;
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210 }
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211
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212
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213
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214 /*******************************/
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215 /* UTF8String AVP type */
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216 /*******************************/
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217
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218 /* Dump the AVP in a natural human-readable format */
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219 char * fd_dictfct_UTF8String_dump(union avp_value * avp_value)
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220 {
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221 #define TRUNC_LEN 42 /* avoid very long strings */
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222 char * ret = strndup((char *)avp_value->os.data, TRUNC_LEN);
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223 if (ret && (*ret != '\0')) {
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224 /* We sanitize the returned string to avoid UTF8 boundary problem.
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225 We do this whether the string is trucated at TRUNC_LEN or not, to avoid potential problem
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226 with malformed AVP */
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227
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228 char * end = strchr(ret, '\0');
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229
923
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230 while (end > ret) {
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diff changeset
231 end--;
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diff changeset
232 char b = *end;
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233 /* after the position pointed by end, we have only \0s */
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diff changeset
234 if ((b & 0x80) == 0) {
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235 break; /* this is a single byte char, no problem */
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diff changeset
236 } else {
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237 /* this byte is start or cont. of multibyte sequence, as we do not know the next byte we need to delete it. */
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diff changeset
238 *end = '\0';
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diff changeset
239 if (b & 0x40)
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diff changeset
240 break; /* This was a start byte, we can stop the loop */
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diff changeset
241 }
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diff changeset
242 }
922
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243 }
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244 return ret;
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245 }
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246
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247
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248 /*******************************/
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249 /* Time AVP type */
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250 /*******************************/
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251
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252 /* The interpret and encode functions work with a "time_t" pointer for mapping
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diff changeset
253 the contents of the AVP */
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254
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255 /* Unix Epoch starts 1970-01-01, NTP 0 is at 1900-01-01 */
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256 #define DIFF_EPOCH_TO_NTP ((365*(1970-1900) + 17ul) * 24 * 60 * 60)
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257
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258 static int diameter_string_to_time_t(const char *str, size_t len, time_t *result) {
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259 time_t time_stamp;
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260 CHECK_PARAMS(len == 4);
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261
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262 time_stamp = (((unsigned long)(str[0]&0xff))<<24) + ((str[1]&0xff)<<16) + ((str[2]&0xff)<<8) + ((str[3]&0xff));
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263 time_stamp -= DIFF_EPOCH_TO_NTP;
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264 #ifdef FIX__NEEDED_FOR_YEAR_2036_AND_LATER
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265 /* NTP overflows in 2036; after that, values start at zero again */
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266 #define NTP_OVERFLOW_CORRECTION (0x100000000ull)
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267 /* XXX: debug and find correct conversion */
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268 if (str[0] & 0x80 == 0x00) {
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269 time_stamp += NTP_OVERFLOW_CORRECTION;
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270 }
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271 #endif
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272 *result = time_stamp;
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273 return 0;
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274 }
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275
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276 static int time_t_to_diameter_string(time_t time_stamp, char **result) {
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277 uint64_t out = time_stamp;
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278 char *conv;
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279 /* XXX: 2036 fix */
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280 out += DIFF_EPOCH_TO_NTP;
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281 CHECK_PARAMS( (out >> 32) == 0);
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282
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283 CHECK_MALLOC(conv=(char *)malloc(5));
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284
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285 conv[0] = (out>>24) & 0xff;
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286 conv[1] = (out>>16) & 0xff;
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287 conv[2] = (out>> 8) & 0xff;
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288 conv[3] = out & 0xff;
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289 conv[4] = '\0';
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290 *result = conv;
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291 return 0;
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292 }
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293
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294 int fd_dictfct_Time_encode(void * data, union avp_value * avp_value)
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295 {
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296 char * buf;
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297 size_t len;
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298
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299 TRACE_ENTRY("%p %p", data, avp_value);
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300 CHECK_PARAMS( data && avp_value );
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301
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302 CHECK_FCT( time_t_to_diameter_string( *((time_t *)data), &buf) );
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303 /* FIXME: return len from the function above? */ len = 4;
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304
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305 avp_value->os.len = len;
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306 avp_value->os.data = (uint8_t *)buf;
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307 return 0;
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308 }
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309
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310 int fd_dictfct_Time_interpret(union avp_value * avp_value, void * interpreted)
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311 {
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312 TRACE_ENTRY("%p %p", avp_value, interpreted);
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313
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314 CHECK_PARAMS( avp_value && interpreted );
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315
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316 return diameter_string_to_time_t((const char *)avp_value->os.data, avp_value->os.len, interpreted);
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317 }
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318
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319 char * fd_dictfct_Time_dump(union avp_value * avp_value)
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320 {
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321 char * ret;
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322 CHECK_MALLOC_DO( ret = malloc(STR_LEN), return NULL );
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323 if (avp_value->os.len != 4) {
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324 snprintf(ret, STR_LEN, "[invalid length: %zd]", avp_value->os.len);
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325 return ret;
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326 }
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327 /* TODO: display the time as human-readable */
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328 snprintf(ret, STR_LEN, "[TODO Time dump: 0x%02hhx%02hhx%02hhx%02hhx]", avp_value->os.data[0], avp_value->os.data[1], avp_value->os.data[2], avp_value->os.data[3]);
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329 return ret;
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330 }
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331
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