1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel (at) haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23 #include "curl_setup.h" 24 25 #ifdef HAVE_NETINET_IN_H 26 # include <netinet/in.h> 27 #endif 28 #ifdef HAVE_ARPA_INET_H 29 # include <arpa/inet.h> 30 #endif 31 #ifdef HAVE_NET_IF_H 32 # include <net/if.h> 33 #endif 34 #ifdef HAVE_SYS_IOCTL_H 35 # include <sys/ioctl.h> 36 #endif 37 #ifdef HAVE_NETDB_H 38 # include <netdb.h> 39 #endif 40 #ifdef HAVE_SYS_SOCKIO_H 41 # include <sys/sockio.h> 42 #endif 43 #ifdef HAVE_IFADDRS_H 44 # include <ifaddrs.h> 45 #endif 46 #ifdef HAVE_STROPTS_H 47 # include <stropts.h> 48 #endif 49 #ifdef __VMS 50 # include <inet.h> 51 #endif 52 53 #include "inet_ntop.h" 54 #include "strcase.h" 55 #include "if2ip.h" 56 /* The last 3 #include files should be in this order */ 57 #include "curl_printf.h" 58 #include "curl_memory.h" 59 #include "memdebug.h" 60 61 /* ------------------------------------------------------------------ */ 62 63 /* Return the scope of the given address. */ 64 unsigned int Curl_ipv6_scope(const struct sockaddr *sa) 65 { 66 #ifndef ENABLE_IPV6 67 (void) sa; 68 #else 69 if(sa->sa_family == AF_INET6) { 70 const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *)(void *) sa; 71 const unsigned char *b = sa6->sin6_addr.s6_addr; 72 unsigned short w = (unsigned short) ((b[0] << 8) | b[1]); 73 74 if((b[0] & 0xFE) == 0xFC) /* Handle ULAs */ 75 return IPV6_SCOPE_UNIQUELOCAL; 76 switch(w & 0xFFC0) { 77 case 0xFE80: 78 return IPV6_SCOPE_LINKLOCAL; 79 case 0xFEC0: 80 return IPV6_SCOPE_SITELOCAL; 81 case 0x0000: 82 w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] | 83 b[10] | b[11] | b[12] | b[13] | b[14]; 84 if(w || b[15] != 0x01) 85 break; 86 return IPV6_SCOPE_NODELOCAL; 87 default: 88 break; 89 } 90 } 91 #endif 92 93 return IPV6_SCOPE_GLOBAL; 94 } 95 96 97 #if defined(HAVE_GETIFADDRS) 98 99 bool Curl_if_is_interface_name(const char *interf) 100 { 101 bool result = FALSE; 102 103 struct ifaddrs *iface, *head; 104 105 if(getifaddrs(&head) >= 0) { 106 for(iface = head; iface != NULL; iface = iface->ifa_next) { 107 if(strcasecompare(iface->ifa_name, interf)) { 108 result = TRUE; 109 break; 110 } 111 } 112 freeifaddrs(head); 113 } 114 return result; 115 } 116 117 if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, 118 unsigned int remote_scope_id, const char *interf, 119 char *buf, int buf_size) 120 { 121 struct ifaddrs *iface, *head; 122 if2ip_result_t res = IF2IP_NOT_FOUND; 123 124 #ifndef ENABLE_IPV6 125 (void) remote_scope; 126 #endif 127 128 #if !defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) || \ 129 !defined(ENABLE_IPV6) 130 (void) remote_scope_id; 131 #endif 132 133 if(getifaddrs(&head) >= 0) { 134 for(iface = head; iface != NULL; iface = iface->ifa_next) { 135 if(iface->ifa_addr != NULL) { 136 if(iface->ifa_addr->sa_family == af) { 137 if(strcasecompare(iface->ifa_name, interf)) { 138 void *addr; 139 char *ip; 140 char scope[12] = ""; 141 char ipstr[64]; 142 #ifdef ENABLE_IPV6 143 if(af == AF_INET6) { 144 unsigned int scopeid = 0; 145 unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr); 146 147 if(ifscope != remote_scope) { 148 /* We are interested only in interface addresses whose 149 scope matches the remote address we want to 150 connect to: global for global, link-local for 151 link-local, etc... */ 152 if(res == IF2IP_NOT_FOUND) res = IF2IP_AF_NOT_SUPPORTED; 153 continue; 154 } 155 156 addr = 157 &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr; 158 #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID 159 /* Include the scope of this interface as part of the address */ 160 scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr) 161 ->sin6_scope_id; 162 163 /* If given, scope id should match. */ 164 if(remote_scope_id && scopeid != remote_scope_id) { 165 if(res == IF2IP_NOT_FOUND) 166 res = IF2IP_AF_NOT_SUPPORTED; 167 168 continue; 169 } 170 #endif 171 if(scopeid) 172 snprintf(scope, sizeof(scope), "%%%u", scopeid); 173 } 174 else 175 #endif 176 addr = 177 &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr; 178 res = IF2IP_FOUND; 179 ip = (char *) Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr)); 180 snprintf(buf, buf_size, "%s%s", ip, scope); 181 break; 182 } 183 } 184 else if((res == IF2IP_NOT_FOUND) && 185 strcasecompare(iface->ifa_name, interf)) { 186 res = IF2IP_AF_NOT_SUPPORTED; 187 } 188 } 189 } 190 191 freeifaddrs(head); 192 } 193 194 return res; 195 } 196 197 #elif defined(HAVE_IOCTL_SIOCGIFADDR) 198 199 bool Curl_if_is_interface_name(const char *interf) 200 { 201 /* This is here just to support the old interfaces */ 202 char buf[256]; 203 204 return (Curl_if2ip(AF_INET, 0 /* unused */, 0, interf, buf, sizeof(buf)) == 205 IF2IP_NOT_FOUND) ? FALSE : TRUE; 206 } 207 208 if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, 209 unsigned int remote_scope_id, const char *interf, 210 char *buf, int buf_size) 211 { 212 struct ifreq req; 213 struct in_addr in; 214 struct sockaddr_in *s; 215 curl_socket_t dummy; 216 size_t len; 217 218 (void)remote_scope; 219 (void)remote_scope_id; 220 221 if(!interf || (af != AF_INET)) 222 return IF2IP_NOT_FOUND; 223 224 len = strlen(interf); 225 if(len >= sizeof(req.ifr_name)) 226 return IF2IP_NOT_FOUND; 227 228 dummy = socket(AF_INET, SOCK_STREAM, 0); 229 if(CURL_SOCKET_BAD == dummy) 230 return IF2IP_NOT_FOUND; 231 232 memset(&req, 0, sizeof(req)); 233 memcpy(req.ifr_name, interf, len + 1); 234 req.ifr_addr.sa_family = AF_INET; 235 236 if(ioctl(dummy, SIOCGIFADDR, &req) < 0) { 237 sclose(dummy); 238 /* With SIOCGIFADDR, we cannot tell the difference between an interface 239 that does not exist and an interface that has no address of the 240 correct family. Assume the interface does not exist */ 241 return IF2IP_NOT_FOUND; 242 } 243 244 s = (struct sockaddr_in *)(void *)&req.ifr_addr; 245 memcpy(&in, &s->sin_addr, sizeof(in)); 246 Curl_inet_ntop(s->sin_family, &in, buf, buf_size); 247 248 sclose(dummy); 249 return IF2IP_FOUND; 250 } 251 252 #else 253 254 bool Curl_if_is_interface_name(const char *interf) 255 { 256 (void) interf; 257 258 return FALSE; 259 } 260 261 if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, 262 unsigned int remote_scope_id, const char *interf, 263 char *buf, int buf_size) 264 { 265 (void) af; 266 (void) remote_scope; 267 (void) remote_scope_id; 268 (void) interf; 269 (void) buf; 270 (void) buf_size; 271 return IF2IP_NOT_FOUND; 272 } 273 274 #endif 275
