/* $Id$ */ /* * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) * Copyright (C) 2003-2008 Benny Prijono * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include /* Set to 1 to enable tracing */ #if 0 # include # define THIS_FILE "ip_helper_generic.c" # define TRACE_(exp) PJ_LOG(5,exp) static const char *get_os_errmsg(void) { static char errmsg[PJ_ERR_MSG_SIZE]; pj_strerror(pj_get_os_error(), errmsg, sizeof(errmsg)); return errmsg; } static const char *get_addr(void *addr) { static char txt[PJ_INET6_ADDRSTRLEN]; struct sockaddr *ad = (struct sockaddr*)addr; if (ad->sa_family != PJ_AF_INET && ad->sa_family != PJ_AF_INET6) return "?"; return pj_inet_ntop2(ad->sa_family, pj_sockaddr_get_addr(ad), txt, sizeof(txt)); } #else # define TRACE_(exp) #endif #if 0 /* dummy */ #elif defined(PJ_HAS_IFADDRS_H) && PJ_HAS_IFADDRS_H != 0 && \ defined(PJ_HAS_NET_IF_H) && PJ_HAS_NET_IF_H != 0 /* Using getifaddrs() is preferred since it can work with both IPv4 and IPv6 */ static pj_status_t if_enum_by_af(int af, unsigned *p_cnt, pj_sockaddr ifs[]) { struct ifaddrs *ifap = NULL, *it; unsigned max; PJ_ASSERT_RETURN(af==PJ_AF_INET || af==PJ_AF_INET6, PJ_EINVAL); TRACE_((THIS_FILE, "Starting interface enum with getifaddrs() for af=%d", af)); if (getifaddrs(&ifap) != 0) { TRACE_((THIS_FILE, " getifarrds() failed: %s", get_os_errmsg())); return PJ_RETURN_OS_ERROR(pj_get_netos_error()); } it = ifap; max = *p_cnt; *p_cnt = 0; for (; it!=NULL && *p_cnt < max; it = it->ifa_next) { struct sockaddr *ad = it->ifa_addr; TRACE_((THIS_FILE, " checking %s", it->ifa_name)); if ((it->ifa_flags & IFF_UP)==0) { TRACE_((THIS_FILE, " interface is down")); continue; /* Skip when interface is down */ } #if PJ_IP_HELPER_IGNORE_LOOPBACK_IF if (it->ifa_flags & IFF_LOOPBACK) { TRACE_((THIS_FILE, " loopback interface")); continue; /* Skip loopback interface */ } #endif if (ad==NULL) { TRACE_((THIS_FILE, " NULL address ignored")); continue; /* reported to happen on Linux 2.6.25.9 with ppp interface */ } if (ad->sa_family != af) { TRACE_((THIS_FILE, " address %s ignored (af=%d)", get_addr(ad), ad->sa_family)); continue; /* Skip when interface is down */ } /* Ignore 0.0.0.0/8 address. This is a special address * which doesn't seem to have practical use. */ if (af==pj_AF_INET() && (pj_ntohl(((pj_sockaddr_in*)ad)->sin_addr.s_addr) >> 24) == 0) { TRACE_((THIS_FILE, " address %s ignored (0.0.0.0/8 class)", get_addr(ad), ad->sa_family)); continue; } TRACE_((THIS_FILE, " address %s (af=%d) added at index %d", get_addr(ad), ad->sa_family, *p_cnt)); pj_bzero(&ifs[*p_cnt], sizeof(ifs[0])); pj_memcpy(&ifs[*p_cnt], ad, pj_sockaddr_get_len(ad)); PJ_SOCKADDR_RESET_LEN(&ifs[*p_cnt]); (*p_cnt)++; } freeifaddrs(ifap); TRACE_((THIS_FILE, "done, found %d address(es)", *p_cnt)); return (*p_cnt != 0) ? PJ_SUCCESS : PJ_ENOTFOUND; } #elif defined(SIOCGIFCONF) && \ defined(PJ_HAS_NET_IF_H) && PJ_HAS_NET_IF_H != 0 /* Note: this does not work with IPv6 */ static pj_status_t if_enum_by_af(int af, unsigned *p_cnt, pj_sockaddr ifs[]) { pj_sock_t sock; char buf[512]; struct ifconf ifc; struct ifreq *ifr; int i, count; pj_status_t status; PJ_ASSERT_RETURN(af==PJ_AF_INET || af==PJ_AF_INET6, PJ_EINVAL); TRACE_((THIS_FILE, "Starting interface enum with SIOCGIFCONF for af=%d", af)); status = pj_sock_socket(af, PJ_SOCK_DGRAM, 0, &sock); if (status != PJ_SUCCESS) return status; /* Query available interfaces */ ifc.ifc_len = sizeof(buf); ifc.ifc_buf = buf; if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) { int oserr = pj_get_netos_error(); TRACE_((THIS_FILE, " ioctl(SIOCGIFCONF) failed: %s", get_os_errmsg())); pj_sock_close(sock); return PJ_RETURN_OS_ERROR(oserr); } /* Interface interfaces */ ifr = (struct ifreq*) ifc.ifc_req; count = ifc.ifc_len / sizeof(struct ifreq); if (count > *p_cnt) count = *p_cnt; *p_cnt = 0; for (i=0; iifr_addr; TRACE_((THIS_FILE, " checking interface %s", itf->ifr_name)); /* Skip address with different family */ if (ad->sa_family != af) { TRACE_((THIS_FILE, " address %s (af=%d) ignored", get_addr(ad), (int)ad->sa_family)); continue; } if (ioctl(sock, SIOCGIFFLAGS, &iff) != 0) { TRACE_((THIS_FILE, " ioctl(SIOCGIFFLAGS) failed: %s", get_os_errmsg())); continue; /* Failed to get flags, continue */ } if ((iff.ifr_flags & IFF_UP)==0) { TRACE_((THIS_FILE, " interface is down")); continue; /* Skip when interface is down */ } #if PJ_IP_HELPER_IGNORE_LOOPBACK_IF if (iff.ifr_flags & IFF_LOOPBACK) { TRACE_((THIS_FILE, " loopback interface")); continue; /* Skip loopback interface */ } #endif /* Ignore 0.0.0.0/8 address. This is a special address * which doesn't seem to have practical use. */ if (af==pj_AF_INET() && (pj_ntohl(((pj_sockaddr_in*)ad)->sin_addr.s_addr) >> 24) == 0) { TRACE_((THIS_FILE, " address %s ignored (0.0.0.0/8 class)", get_addr(ad), ad->sa_family)); continue; } TRACE_((THIS_FILE, " address %s (af=%d) added at index %d", get_addr(ad), ad->sa_family, *p_cnt)); pj_bzero(&ifs[*p_cnt], sizeof(ifs[0])); pj_memcpy(&ifs[*p_cnt], ad, pj_sockaddr_get_len(ad)); PJ_SOCKADDR_RESET_LEN(&ifs[*p_cnt]); (*p_cnt)++; } /* Done with socket */ pj_sock_close(sock); TRACE_((THIS_FILE, "done, found %d address(es)", *p_cnt)); return (*p_cnt != 0) ? PJ_SUCCESS : PJ_ENOTFOUND; } #elif defined(PJ_HAS_NET_IF_H) && PJ_HAS_NET_IF_H != 0 /* Note: this does not work with IPv6 */ static pj_status_t if_enum_by_af(int af, unsigned *p_cnt, pj_sockaddr ifs[]) { struct if_nameindex *if_list; struct ifreq ifreq; pj_sock_t sock; unsigned i, max_count; pj_status_t status; PJ_ASSERT_RETURN(af==PJ_AF_INET || af==PJ_AF_INET6, PJ_EINVAL); TRACE_((THIS_FILE, "Starting if_nameindex() for af=%d", af)); status = pj_sock_socket(af, PJ_SOCK_DGRAM, 0, &sock); if (status != PJ_SUCCESS) return status; if_list = if_nameindex(); if (if_list == NULL) return PJ_ENOTFOUND; max_count = *p_cnt; *p_cnt = 0; for (i=0; if_list[i].if_index && *p_cntsa_family != af) { TRACE_((THIS_FILE, " address %s family %d ignored", get_addr(&ifreq.ifr_addr), ifreq.ifr_addr.sa_family)); continue; /* Not address family that we want, continue */ } /* Ignore 0.0.0.0/8 address. This is a special address * which doesn't seem to have practical use. */ if (af==pj_AF_INET() && (pj_ntohl(((pj_sockaddr_in*)ad)->sin_addr.s_addr) >> 24) == 0) { TRACE_((THIS_FILE, " address %s ignored (0.0.0.0/8 class)", get_addr(ad), ad->sa_family)); continue; } /* Got an address ! */ TRACE_((THIS_FILE, " address %s (af=%d) added at index %d", get_addr(ad), ad->sa_family, *p_cnt)); pj_bzero(&ifs[*p_cnt], sizeof(ifs[0])); pj_memcpy(&ifs[*p_cnt], ad, pj_sockaddr_get_len(ad)); PJ_SOCKADDR_RESET_LEN(&ifs[*p_cnt]); (*p_cnt)++; } if_freenameindex(if_list); pj_sock_close(sock); TRACE_((THIS_FILE, "done, found %d address(es)", *p_cnt)); return (*p_cnt != 0) ? PJ_SUCCESS : PJ_ENOTFOUND; } #else static pj_status_t if_enum_by_af(int af, unsigned *p_cnt, pj_sockaddr ifs[]) { pj_status_t status; PJ_ASSERT_RETURN(p_cnt && *p_cnt > 0 && ifs, PJ_EINVAL); pj_bzero(ifs, sizeof(ifs[0]) * (*p_cnt)); /* Just get one default route */ status = pj_getdefaultipinterface(af, &ifs[0]); if (status != PJ_SUCCESS) return status; *p_cnt = 1; return PJ_SUCCESS; } #endif /* SIOCGIFCONF */ /* * Enumerate the local IP interface currently active in the host. */ PJ_DEF(pj_status_t) pj_enum_ip_interface(int af, unsigned *p_cnt, pj_sockaddr ifs[]) { unsigned start; pj_status_t status; start = 0; if (af==PJ_AF_INET6 || af==PJ_AF_UNSPEC) { unsigned max = *p_cnt; status = if_enum_by_af(PJ_AF_INET6, &max, &ifs[start]); if (status == PJ_SUCCESS) { start += max; (*p_cnt) -= max; } } if (af==PJ_AF_INET || af==PJ_AF_UNSPEC) { unsigned max = *p_cnt; status = if_enum_by_af(PJ_AF_INET, &max, &ifs[start]); if (status == PJ_SUCCESS) { start += max; (*p_cnt) -= max; } } *p_cnt = start; return (*p_cnt != 0) ? PJ_SUCCESS : PJ_ENOTFOUND; } /* * Enumerate the IP routing table for this host. */ PJ_DEF(pj_status_t) pj_enum_ip_route(unsigned *p_cnt, pj_ip_route_entry routes[]) { pj_sockaddr itf; pj_status_t status; PJ_ASSERT_RETURN(p_cnt && *p_cnt > 0 && routes, PJ_EINVAL); pj_bzero(routes, sizeof(routes[0]) * (*p_cnt)); /* Just get one default route */ status = pj_getdefaultipinterface(PJ_AF_INET, &itf); if (status != PJ_SUCCESS) return status; routes[0].ipv4.if_addr.s_addr = itf.ipv4.sin_addr.s_addr; routes[0].ipv4.dst_addr.s_addr = 0; routes[0].ipv4.mask.s_addr = 0; *p_cnt = 1; return PJ_SUCCESS; }