Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pj/ip_helper.h> |
| 21 | #include <pj/addr_resolv.h> |
| 22 | #include <pj/assert.h> |
| 23 | #include <pj/errno.h> |
| 24 | #include <pj/string.h> |
| 25 | #include <pj/compat/socket.h> |
| 26 | #include <pj/sock.h> |
| 27 | |
| 28 | /* Set to 1 to enable tracing */ |
| 29 | #if 0 |
| 30 | # include <pj/log.h> |
| 31 | # define THIS_FILE "ip_helper_generic.c" |
| 32 | # define TRACE_(exp) PJ_LOG(5,exp) |
| 33 | static const char *get_os_errmsg(void) |
| 34 | { |
| 35 | static char errmsg[PJ_ERR_MSG_SIZE]; |
| 36 | pj_strerror(pj_get_os_error(), errmsg, sizeof(errmsg)); |
| 37 | return errmsg; |
| 38 | } |
| 39 | static const char *get_addr(void *addr) |
| 40 | { |
| 41 | static char txt[PJ_INET6_ADDRSTRLEN]; |
| 42 | struct sockaddr *ad = (struct sockaddr*)addr; |
| 43 | if (ad->sa_family != PJ_AF_INET && ad->sa_family != PJ_AF_INET6) |
| 44 | return "?"; |
| 45 | return pj_inet_ntop2(ad->sa_family, pj_sockaddr_get_addr(ad), |
| 46 | txt, sizeof(txt)); |
| 47 | } |
| 48 | #else |
| 49 | # define TRACE_(exp) |
| 50 | #endif |
| 51 | |
| 52 | |
| 53 | #if 0 |
| 54 | /* dummy */ |
| 55 | |
| 56 | #elif defined(PJ_HAS_IFADDRS_H) && PJ_HAS_IFADDRS_H != 0 && \ |
| 57 | defined(PJ_HAS_NET_IF_H) && PJ_HAS_NET_IF_H != 0 |
| 58 | /* Using getifaddrs() is preferred since it can work with both IPv4 and IPv6 */ |
| 59 | static pj_status_t if_enum_by_af(int af, |
| 60 | unsigned *p_cnt, |
| 61 | pj_sockaddr ifs[]) |
| 62 | { |
| 63 | struct ifaddrs *ifap = NULL, *it; |
| 64 | unsigned max; |
| 65 | |
| 66 | PJ_ASSERT_RETURN(af==PJ_AF_INET || af==PJ_AF_INET6, PJ_EINVAL); |
| 67 | |
| 68 | TRACE_((THIS_FILE, "Starting interface enum with getifaddrs() for af=%d", |
| 69 | af)); |
| 70 | |
| 71 | if (getifaddrs(&ifap) != 0) { |
| 72 | TRACE_((THIS_FILE, " getifarrds() failed: %s", get_os_errmsg())); |
| 73 | return PJ_RETURN_OS_ERROR(pj_get_netos_error()); |
| 74 | } |
| 75 | |
| 76 | it = ifap; |
| 77 | max = *p_cnt; |
| 78 | *p_cnt = 0; |
| 79 | for (; it!=NULL && *p_cnt < max; it = it->ifa_next) { |
| 80 | struct sockaddr *ad = it->ifa_addr; |
| 81 | |
| 82 | TRACE_((THIS_FILE, " checking %s", it->ifa_name)); |
| 83 | |
| 84 | if ((it->ifa_flags & IFF_UP)==0) { |
| 85 | TRACE_((THIS_FILE, " interface is down")); |
| 86 | continue; /* Skip when interface is down */ |
| 87 | } |
| 88 | |
| 89 | #if PJ_IP_HELPER_IGNORE_LOOPBACK_IF |
| 90 | if (it->ifa_flags & IFF_LOOPBACK) { |
| 91 | TRACE_((THIS_FILE, " loopback interface")); |
| 92 | continue; /* Skip loopback interface */ |
| 93 | } |
| 94 | #endif |
| 95 | |
| 96 | if (ad==NULL) { |
| 97 | TRACE_((THIS_FILE, " NULL address ignored")); |
| 98 | continue; /* reported to happen on Linux 2.6.25.9 |
| 99 | with ppp interface */ |
| 100 | } |
| 101 | |
| 102 | if (ad->sa_family != af) { |
| 103 | TRACE_((THIS_FILE, " address %s ignored (af=%d)", |
| 104 | get_addr(ad), ad->sa_family)); |
| 105 | continue; /* Skip when interface is down */ |
| 106 | } |
| 107 | |
| 108 | /* Ignore 0.0.0.0/8 address. This is a special address |
| 109 | * which doesn't seem to have practical use. |
| 110 | */ |
| 111 | if (af==pj_AF_INET() && |
| 112 | (pj_ntohl(((pj_sockaddr_in*)ad)->sin_addr.s_addr) >> 24) == 0) |
| 113 | { |
| 114 | TRACE_((THIS_FILE, " address %s ignored (0.0.0.0/8 class)", |
| 115 | get_addr(ad), ad->sa_family)); |
| 116 | continue; |
| 117 | } |
| 118 | |
| 119 | TRACE_((THIS_FILE, " address %s (af=%d) added at index %d", |
| 120 | get_addr(ad), ad->sa_family, *p_cnt)); |
| 121 | |
| 122 | pj_bzero(&ifs[*p_cnt], sizeof(ifs[0])); |
| 123 | pj_memcpy(&ifs[*p_cnt], ad, pj_sockaddr_get_len(ad)); |
| 124 | PJ_SOCKADDR_RESET_LEN(&ifs[*p_cnt]); |
| 125 | (*p_cnt)++; |
| 126 | } |
| 127 | |
| 128 | freeifaddrs(ifap); |
| 129 | TRACE_((THIS_FILE, "done, found %d address(es)", *p_cnt)); |
| 130 | return (*p_cnt != 0) ? PJ_SUCCESS : PJ_ENOTFOUND; |
| 131 | } |
| 132 | |
| 133 | #elif defined(SIOCGIFCONF) && \ |
| 134 | defined(PJ_HAS_NET_IF_H) && PJ_HAS_NET_IF_H != 0 |
| 135 | |
| 136 | /* Note: this does not work with IPv6 */ |
| 137 | static pj_status_t if_enum_by_af(int af, |
| 138 | unsigned *p_cnt, |
| 139 | pj_sockaddr ifs[]) |
| 140 | { |
| 141 | pj_sock_t sock; |
| 142 | char buf[512]; |
| 143 | struct ifconf ifc; |
| 144 | struct ifreq *ifr; |
| 145 | int i, count; |
| 146 | pj_status_t status; |
| 147 | |
| 148 | PJ_ASSERT_RETURN(af==PJ_AF_INET || af==PJ_AF_INET6, PJ_EINVAL); |
| 149 | |
| 150 | TRACE_((THIS_FILE, "Starting interface enum with SIOCGIFCONF for af=%d", |
| 151 | af)); |
| 152 | |
| 153 | status = pj_sock_socket(af, PJ_SOCK_DGRAM, 0, &sock); |
| 154 | if (status != PJ_SUCCESS) |
| 155 | return status; |
| 156 | |
| 157 | /* Query available interfaces */ |
| 158 | ifc.ifc_len = sizeof(buf); |
| 159 | ifc.ifc_buf = buf; |
| 160 | |
| 161 | if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) { |
| 162 | int oserr = pj_get_netos_error(); |
| 163 | TRACE_((THIS_FILE, " ioctl(SIOCGIFCONF) failed: %s", get_os_errmsg())); |
| 164 | pj_sock_close(sock); |
| 165 | return PJ_RETURN_OS_ERROR(oserr); |
| 166 | } |
| 167 | |
| 168 | /* Interface interfaces */ |
| 169 | ifr = (struct ifreq*) ifc.ifc_req; |
| 170 | count = ifc.ifc_len / sizeof(struct ifreq); |
| 171 | if (count > *p_cnt) |
| 172 | count = *p_cnt; |
| 173 | |
| 174 | *p_cnt = 0; |
| 175 | for (i=0; i<count; ++i) { |
| 176 | struct ifreq *itf = &ifr[i]; |
| 177 | struct ifreq iff = *itf; |
| 178 | struct sockaddr *ad = &itf->ifr_addr; |
| 179 | |
| 180 | TRACE_((THIS_FILE, " checking interface %s", itf->ifr_name)); |
| 181 | |
| 182 | /* Skip address with different family */ |
| 183 | if (ad->sa_family != af) { |
| 184 | TRACE_((THIS_FILE, " address %s (af=%d) ignored", |
| 185 | get_addr(ad), (int)ad->sa_family)); |
| 186 | continue; |
| 187 | } |
| 188 | |
| 189 | if (ioctl(sock, SIOCGIFFLAGS, &iff) != 0) { |
| 190 | TRACE_((THIS_FILE, " ioctl(SIOCGIFFLAGS) failed: %s", |
| 191 | get_os_errmsg())); |
| 192 | continue; /* Failed to get flags, continue */ |
| 193 | } |
| 194 | |
| 195 | if ((iff.ifr_flags & IFF_UP)==0) { |
| 196 | TRACE_((THIS_FILE, " interface is down")); |
| 197 | continue; /* Skip when interface is down */ |
| 198 | } |
| 199 | |
| 200 | #if PJ_IP_HELPER_IGNORE_LOOPBACK_IF |
| 201 | if (iff.ifr_flags & IFF_LOOPBACK) { |
| 202 | TRACE_((THIS_FILE, " loopback interface")); |
| 203 | continue; /* Skip loopback interface */ |
| 204 | } |
| 205 | #endif |
| 206 | |
| 207 | /* Ignore 0.0.0.0/8 address. This is a special address |
| 208 | * which doesn't seem to have practical use. |
| 209 | */ |
| 210 | if (af==pj_AF_INET() && |
| 211 | (pj_ntohl(((pj_sockaddr_in*)ad)->sin_addr.s_addr) >> 24) == 0) |
| 212 | { |
| 213 | TRACE_((THIS_FILE, " address %s ignored (0.0.0.0/8 class)", |
| 214 | get_addr(ad), ad->sa_family)); |
| 215 | continue; |
| 216 | } |
| 217 | |
| 218 | TRACE_((THIS_FILE, " address %s (af=%d) added at index %d", |
| 219 | get_addr(ad), ad->sa_family, *p_cnt)); |
| 220 | |
| 221 | pj_bzero(&ifs[*p_cnt], sizeof(ifs[0])); |
| 222 | pj_memcpy(&ifs[*p_cnt], ad, pj_sockaddr_get_len(ad)); |
| 223 | PJ_SOCKADDR_RESET_LEN(&ifs[*p_cnt]); |
| 224 | (*p_cnt)++; |
| 225 | } |
| 226 | |
| 227 | /* Done with socket */ |
| 228 | pj_sock_close(sock); |
| 229 | |
| 230 | TRACE_((THIS_FILE, "done, found %d address(es)", *p_cnt)); |
| 231 | return (*p_cnt != 0) ? PJ_SUCCESS : PJ_ENOTFOUND; |
| 232 | } |
| 233 | |
| 234 | |
| 235 | #elif defined(PJ_HAS_NET_IF_H) && PJ_HAS_NET_IF_H != 0 |
| 236 | /* Note: this does not work with IPv6 */ |
| 237 | static pj_status_t if_enum_by_af(int af, unsigned *p_cnt, pj_sockaddr ifs[]) |
| 238 | { |
| 239 | struct if_nameindex *if_list; |
| 240 | struct ifreq ifreq; |
| 241 | pj_sock_t sock; |
| 242 | unsigned i, max_count; |
| 243 | pj_status_t status; |
| 244 | |
| 245 | PJ_ASSERT_RETURN(af==PJ_AF_INET || af==PJ_AF_INET6, PJ_EINVAL); |
| 246 | |
| 247 | TRACE_((THIS_FILE, "Starting if_nameindex() for af=%d", af)); |
| 248 | |
| 249 | status = pj_sock_socket(af, PJ_SOCK_DGRAM, 0, &sock); |
| 250 | if (status != PJ_SUCCESS) |
| 251 | return status; |
| 252 | |
| 253 | if_list = if_nameindex(); |
| 254 | if (if_list == NULL) |
| 255 | return PJ_ENOTFOUND; |
| 256 | |
| 257 | max_count = *p_cnt; |
| 258 | *p_cnt = 0; |
| 259 | for (i=0; if_list[i].if_index && *p_cnt<max_count; ++i) { |
| 260 | struct sockaddr *ad; |
| 261 | int rc; |
| 262 | |
| 263 | strncpy(ifreq.ifr_name, if_list[i].if_name, IFNAMSIZ); |
| 264 | |
| 265 | TRACE_((THIS_FILE, " checking interface %s", ifreq.ifr_name)); |
| 266 | |
| 267 | if ((rc=ioctl(sock, SIOCGIFFLAGS, &ifreq)) != 0) { |
| 268 | TRACE_((THIS_FILE, " ioctl(SIOCGIFFLAGS) failed: %s", |
| 269 | get_os_errmsg())); |
| 270 | continue; /* Failed to get flags, continue */ |
| 271 | } |
| 272 | |
| 273 | if ((ifreq.ifr_flags & IFF_UP)==0) { |
| 274 | TRACE_((THIS_FILE, " interface is down")); |
| 275 | continue; /* Skip when interface is down */ |
| 276 | } |
| 277 | |
| 278 | #if PJ_IP_HELPER_IGNORE_LOOPBACK_IF |
| 279 | if (ifreq.ifr_flags & IFF_LOOPBACK) { |
| 280 | TRACE_((THIS_FILE, " loopback interface")); |
| 281 | continue; /* Skip loopback interface */ |
| 282 | } |
| 283 | #endif |
| 284 | |
| 285 | /* Note: SIOCGIFADDR does not work for IPv6! */ |
| 286 | if ((rc=ioctl(sock, SIOCGIFADDR, &ifreq)) != 0) { |
| 287 | TRACE_((THIS_FILE, " ioctl(SIOCGIFADDR) failed: %s", |
| 288 | get_os_errmsg())); |
| 289 | continue; /* Failed to get address, continue */ |
| 290 | } |
| 291 | |
| 292 | ad = (struct sockaddr*) &ifreq.ifr_addr; |
| 293 | |
| 294 | if (ad->sa_family != af) { |
| 295 | TRACE_((THIS_FILE, " address %s family %d ignored", |
| 296 | get_addr(&ifreq.ifr_addr), |
| 297 | ifreq.ifr_addr.sa_family)); |
| 298 | continue; /* Not address family that we want, continue */ |
| 299 | } |
| 300 | |
| 301 | /* Ignore 0.0.0.0/8 address. This is a special address |
| 302 | * which doesn't seem to have practical use. |
| 303 | */ |
| 304 | if (af==pj_AF_INET() && |
| 305 | (pj_ntohl(((pj_sockaddr_in*)ad)->sin_addr.s_addr) >> 24) == 0) |
| 306 | { |
| 307 | TRACE_((THIS_FILE, " address %s ignored (0.0.0.0/8 class)", |
| 308 | get_addr(ad), ad->sa_family)); |
| 309 | continue; |
| 310 | } |
| 311 | |
| 312 | /* Got an address ! */ |
| 313 | TRACE_((THIS_FILE, " address %s (af=%d) added at index %d", |
| 314 | get_addr(ad), ad->sa_family, *p_cnt)); |
| 315 | |
| 316 | pj_bzero(&ifs[*p_cnt], sizeof(ifs[0])); |
| 317 | pj_memcpy(&ifs[*p_cnt], ad, pj_sockaddr_get_len(ad)); |
| 318 | PJ_SOCKADDR_RESET_LEN(&ifs[*p_cnt]); |
| 319 | (*p_cnt)++; |
| 320 | } |
| 321 | |
| 322 | if_freenameindex(if_list); |
| 323 | pj_sock_close(sock); |
| 324 | |
| 325 | TRACE_((THIS_FILE, "done, found %d address(es)", *p_cnt)); |
| 326 | return (*p_cnt != 0) ? PJ_SUCCESS : PJ_ENOTFOUND; |
| 327 | } |
| 328 | |
| 329 | #else |
| 330 | static pj_status_t if_enum_by_af(int af, |
| 331 | unsigned *p_cnt, |
| 332 | pj_sockaddr ifs[]) |
| 333 | { |
| 334 | pj_status_t status; |
| 335 | |
| 336 | PJ_ASSERT_RETURN(p_cnt && *p_cnt > 0 && ifs, PJ_EINVAL); |
| 337 | |
| 338 | pj_bzero(ifs, sizeof(ifs[0]) * (*p_cnt)); |
| 339 | |
| 340 | /* Just get one default route */ |
| 341 | status = pj_getdefaultipinterface(af, &ifs[0]); |
| 342 | if (status != PJ_SUCCESS) |
| 343 | return status; |
| 344 | |
| 345 | *p_cnt = 1; |
| 346 | return PJ_SUCCESS; |
| 347 | } |
| 348 | #endif /* SIOCGIFCONF */ |
| 349 | |
| 350 | /* |
| 351 | * Enumerate the local IP interface currently active in the host. |
| 352 | */ |
| 353 | PJ_DEF(pj_status_t) pj_enum_ip_interface(int af, |
| 354 | unsigned *p_cnt, |
| 355 | pj_sockaddr ifs[]) |
| 356 | { |
| 357 | unsigned start; |
| 358 | pj_status_t status; |
| 359 | |
| 360 | start = 0; |
| 361 | if (af==PJ_AF_INET6 || af==PJ_AF_UNSPEC) { |
| 362 | unsigned max = *p_cnt; |
| 363 | status = if_enum_by_af(PJ_AF_INET6, &max, &ifs[start]); |
| 364 | if (status == PJ_SUCCESS) { |
| 365 | start += max; |
| 366 | (*p_cnt) -= max; |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | if (af==PJ_AF_INET || af==PJ_AF_UNSPEC) { |
| 371 | unsigned max = *p_cnt; |
| 372 | status = if_enum_by_af(PJ_AF_INET, &max, &ifs[start]); |
| 373 | if (status == PJ_SUCCESS) { |
| 374 | start += max; |
| 375 | (*p_cnt) -= max; |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | *p_cnt = start; |
| 380 | |
| 381 | return (*p_cnt != 0) ? PJ_SUCCESS : PJ_ENOTFOUND; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Enumerate the IP routing table for this host. |
| 386 | */ |
| 387 | PJ_DEF(pj_status_t) pj_enum_ip_route(unsigned *p_cnt, |
| 388 | pj_ip_route_entry routes[]) |
| 389 | { |
| 390 | pj_sockaddr itf; |
| 391 | pj_status_t status; |
| 392 | |
| 393 | PJ_ASSERT_RETURN(p_cnt && *p_cnt > 0 && routes, PJ_EINVAL); |
| 394 | |
| 395 | pj_bzero(routes, sizeof(routes[0]) * (*p_cnt)); |
| 396 | |
| 397 | /* Just get one default route */ |
| 398 | status = pj_getdefaultipinterface(PJ_AF_INET, &itf); |
| 399 | if (status != PJ_SUCCESS) |
| 400 | return status; |
| 401 | |
| 402 | routes[0].ipv4.if_addr.s_addr = itf.ipv4.sin_addr.s_addr; |
| 403 | routes[0].ipv4.dst_addr.s_addr = 0; |
| 404 | routes[0].ipv4.mask.s_addr = 0; |
| 405 | *p_cnt = 1; |
| 406 | |
| 407 | return PJ_SUCCESS; |
| 408 | } |
| 409 | |