| /* $Id$ */ |
| /* |
| * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| * |
| * 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 <pj/ip_helper.h> |
| #include <pj/addr_resolv.h> |
| #include <pj/assert.h> |
| #include <pj/errno.h> |
| #include <pj/string.h> |
| #include <pj/compat/socket.h> |
| #include <pj/sock.h> |
| |
| /* Set to 1 to enable tracing */ |
| #if 0 |
| # include <pj/log.h> |
| # 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; i<count; ++i) { |
| struct ifreq *itf = &ifr[i]; |
| struct ifreq iff = *itf; |
| struct sockaddr *ad = &itf->ifr_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_cnt<max_count; ++i) { |
| struct sockaddr *ad; |
| int rc; |
| |
| strncpy(ifreq.ifr_name, if_list[i].if_name, IFNAMSIZ); |
| |
| TRACE_((THIS_FILE, " checking interface %s", ifreq.ifr_name)); |
| |
| if ((rc=ioctl(sock, SIOCGIFFLAGS, &ifreq)) != 0) { |
| TRACE_((THIS_FILE, " ioctl(SIOCGIFFLAGS) failed: %s", |
| get_os_errmsg())); |
| continue; /* Failed to get flags, continue */ |
| } |
| |
| if ((ifreq.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 (ifreq.ifr_flags & IFF_LOOPBACK) { |
| TRACE_((THIS_FILE, " loopback interface")); |
| continue; /* Skip loopback interface */ |
| } |
| #endif |
| |
| /* Note: SIOCGIFADDR does not work for IPv6! */ |
| if ((rc=ioctl(sock, SIOCGIFADDR, &ifreq)) != 0) { |
| TRACE_((THIS_FILE, " ioctl(SIOCGIFADDR) failed: %s", |
| get_os_errmsg())); |
| continue; /* Failed to get address, continue */ |
| } |
| |
| ad = (struct sockaddr*) &ifreq.ifr_addr; |
| |
| if (ad->sa_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; |
| } |
| |