1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 |
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23 | #include "curl_setup.h"
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24 |
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25 | #ifdef HAVE_NETINET_IN_H
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26 | # include <netinet/in.h>
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27 | #endif
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28 | #ifdef HAVE_ARPA_INET_H
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29 | # include <arpa/inet.h>
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30 | #endif
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31 | #ifdef HAVE_NET_IF_H
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32 | # include <net/if.h>
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33 | #endif
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34 | #ifdef HAVE_SYS_IOCTL_H
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35 | # include <sys/ioctl.h>
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36 | #endif
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37 | #ifdef HAVE_NETDB_H
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38 | # include <netdb.h>
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39 | #endif
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40 | #ifdef HAVE_SYS_SOCKIO_H
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41 | # include <sys/sockio.h>
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42 | #endif
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43 | #ifdef HAVE_IFADDRS_H
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44 | # include <ifaddrs.h>
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45 | #endif
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46 | #ifdef HAVE_STROPTS_H
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47 | # include <stropts.h>
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48 | #endif
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49 | #ifdef __VMS
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50 | # include <inet.h>
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51 | #endif
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52 |
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53 | #include "inet_ntop.h"
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54 | #include "strcase.h"
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55 | #include "if2ip.h"
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56 | /* The last 3 #include files should be in this order */
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57 | #include "curl_printf.h"
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58 | #include "curl_memory.h"
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59 | #include "memdebug.h"
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60 |
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61 | /* ------------------------------------------------------------------ */
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62 |
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63 | /* Return the scope of the given address. */
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64 | unsigned int Curl_ipv6_scope(const struct sockaddr *sa)
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65 | {
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66 | #ifndef ENABLE_IPV6
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67 | (void) sa;
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68 | #else
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69 | if(sa->sa_family == AF_INET6) {
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70 | const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *)(void *) sa;
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71 | const unsigned char *b = sa6->sin6_addr.s6_addr;
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72 | unsigned short w = (unsigned short) ((b[0] << 8) | b[1]);
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73 |
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74 | if((b[0] & 0xFE) == 0xFC) /* Handle ULAs */
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75 | return IPV6_SCOPE_UNIQUELOCAL;
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76 | switch(w & 0xFFC0) {
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77 | case 0xFE80:
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78 | return IPV6_SCOPE_LINKLOCAL;
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79 | case 0xFEC0:
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80 | return IPV6_SCOPE_SITELOCAL;
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81 | case 0x0000:
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82 | w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] |
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83 | b[10] | b[11] | b[12] | b[13] | b[14];
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84 | if(w || b[15] != 0x01)
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85 | break;
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86 | return IPV6_SCOPE_NODELOCAL;
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87 | default:
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88 | break;
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89 | }
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90 | }
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91 | #endif
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92 |
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93 | return IPV6_SCOPE_GLOBAL;
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94 | }
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95 |
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96 |
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97 | #if defined(HAVE_GETIFADDRS)
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98 |
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99 | bool Curl_if_is_interface_name(const char *interf)
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100 | {
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101 | bool result = FALSE;
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102 |
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103 | struct ifaddrs *iface, *head;
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104 |
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105 | if(getifaddrs(&head) >= 0) {
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106 | for(iface=head; iface != NULL; iface=iface->ifa_next) {
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107 | if(strcasecompare(iface->ifa_name, interf)) {
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108 | result = TRUE;
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109 | break;
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110 | }
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111 | }
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112 | freeifaddrs(head);
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113 | }
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114 | return result;
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115 | }
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116 |
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117 | if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
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118 | unsigned int remote_scope_id, const char *interf,
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119 | char *buf, int buf_size)
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120 | {
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121 | struct ifaddrs *iface, *head;
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122 | if2ip_result_t res = IF2IP_NOT_FOUND;
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123 |
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124 | #ifndef ENABLE_IPV6
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125 | (void) remote_scope;
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126 | #endif
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127 |
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128 | #if !defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) || \
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129 | !defined(ENABLE_IPV6)
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130 | (void) remote_scope_id;
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131 | #endif
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132 |
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133 | if(getifaddrs(&head) >= 0) {
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134 | for(iface = head; iface != NULL; iface=iface->ifa_next) {
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135 | if(iface->ifa_addr != NULL) {
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136 | if(iface->ifa_addr->sa_family == af) {
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137 | if(strcasecompare(iface->ifa_name, interf)) {
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138 | void *addr;
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139 | char *ip;
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140 | char scope[12] = "";
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141 | char ipstr[64];
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142 | #ifdef ENABLE_IPV6
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143 | if(af == AF_INET6) {
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144 | unsigned int scopeid = 0;
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145 | unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr);
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146 |
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147 | if(ifscope != remote_scope) {
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148 | /* We are interested only in interface addresses whose
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149 | scope matches the remote address we want to
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150 | connect to: global for global, link-local for
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151 | link-local, etc... */
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152 | if(res == IF2IP_NOT_FOUND) res = IF2IP_AF_NOT_SUPPORTED;
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153 | continue;
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154 | }
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155 |
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156 | addr =
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157 | &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr;
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158 | #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
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159 | /* Include the scope of this interface as part of the address */
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160 | scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr)
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161 | ->sin6_scope_id;
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162 |
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163 | /* If given, scope id should match. */
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164 | if(remote_scope_id && scopeid != remote_scope_id) {
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165 | if(res == IF2IP_NOT_FOUND)
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166 | res = IF2IP_AF_NOT_SUPPORTED;
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167 |
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168 | continue;
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169 | }
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170 | #endif
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171 | if(scopeid)
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172 | snprintf(scope, sizeof(scope), "%%%u", scopeid);
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173 | }
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174 | else
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175 | #endif
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176 | addr =
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177 | &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr;
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178 | res = IF2IP_FOUND;
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179 | ip = (char *) Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr));
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180 | snprintf(buf, buf_size, "%s%s", ip, scope);
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181 | break;
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182 | }
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183 | }
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184 | else if((res == IF2IP_NOT_FOUND) &&
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185 | strcasecompare(iface->ifa_name, interf)) {
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186 | res = IF2IP_AF_NOT_SUPPORTED;
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187 | }
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188 | }
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189 | }
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190 |
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191 | freeifaddrs(head);
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192 | }
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193 |
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194 | return res;
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195 | }
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196 |
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197 | #elif defined(HAVE_IOCTL_SIOCGIFADDR)
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198 |
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199 | bool Curl_if_is_interface_name(const char *interf)
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200 | {
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201 | /* This is here just to support the old interfaces */
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202 | char buf[256];
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203 |
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204 | return (Curl_if2ip(AF_INET, 0 /* unused */, 0, interf, buf, sizeof(buf)) ==
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205 | IF2IP_NOT_FOUND) ? FALSE : TRUE;
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206 | }
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207 |
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208 | if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
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209 | unsigned int remote_scope_id, const char *interf,
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210 | char *buf, int buf_size)
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211 | {
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212 | struct ifreq req;
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213 | struct in_addr in;
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214 | struct sockaddr_in *s;
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215 | curl_socket_t dummy;
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216 | size_t len;
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217 |
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218 | (void)remote_scope;
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219 | (void)remote_scope_id;
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220 |
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221 | if(!interf || (af != AF_INET))
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222 | return IF2IP_NOT_FOUND;
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223 |
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224 | len = strlen(interf);
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225 | if(len >= sizeof(req.ifr_name))
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226 | return IF2IP_NOT_FOUND;
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227 |
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228 | dummy = socket(AF_INET, SOCK_STREAM, 0);
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229 | if(CURL_SOCKET_BAD == dummy)
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230 | return IF2IP_NOT_FOUND;
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231 |
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232 | memset(&req, 0, sizeof(req));
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233 | memcpy(req.ifr_name, interf, len+1);
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234 | req.ifr_addr.sa_family = AF_INET;
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235 |
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236 | if(ioctl(dummy, SIOCGIFADDR, &req) < 0) {
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237 | sclose(dummy);
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238 | /* With SIOCGIFADDR, we cannot tell the difference between an interface
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239 | that does not exist and an interface that has no address of the
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240 | correct family. Assume the interface does not exist */
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241 | return IF2IP_NOT_FOUND;
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242 | }
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243 |
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244 | s = (struct sockaddr_in *)(void *)&req.ifr_addr;
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245 | memcpy(&in, &s->sin_addr, sizeof(in));
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246 | Curl_inet_ntop(s->sin_family, &in, buf, buf_size);
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247 |
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248 | sclose(dummy);
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249 | return IF2IP_FOUND;
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250 | }
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251 |
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252 | #else
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253 |
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254 | bool Curl_if_is_interface_name(const char *interf)
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255 | {
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256 | (void) interf;
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257 |
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258 | return FALSE;
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259 | }
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260 |
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261 | if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
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262 | unsigned int remote_scope_id, const char *interf,
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263 | char *buf, int buf_size)
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264 | {
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265 | (void) af;
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266 | (void) remote_scope;
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267 | (void) remote_scope_id;
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268 | (void) interf;
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269 | (void) buf;
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270 | (void) buf_size;
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271 | return IF2IP_NOT_FOUND;
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272 | }
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273 |
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274 | #endif
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