/* $Id: getifaddr.c,v 1.19 2013/12/13 14:28:40 nanard Exp $ */ /* MiniUPnP project * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/ * (c) 2006-2014 Thomas Bernard * This software is subject to the conditions detailed * in the LICENCE file provided within the distribution */ #include #include #include #include #include #include #include #include #include #include #if defined(sun) #include #endif #include "config.h" #include "getifaddr.h" #if defined(USE_GETIFADDRS) || defined(ENABLE_IPV6) || defined(ENABLE_PCP) #include #endif int getifaddr(const char * ifname, char * buf, int len, struct in_addr * addr, struct in_addr * mask) { #ifndef USE_GETIFADDRS /* use ioctl SIOCGIFADDR. Works only for ip v4 */ /* SIOCGIFADDR struct ifreq * */ int s; struct ifreq ifr; int ifrlen; struct sockaddr_in * ifaddr; ifrlen = sizeof(ifr); if(!ifname || ifname[0]=='\0') return -1; s = socket(PF_INET, SOCK_DGRAM, 0); if(s < 0) { syslog(LOG_ERR, "socket(PF_INET, SOCK_DGRAM): %m"); return -1; } strncpy(ifr.ifr_name, ifname, IFNAMSIZ); if(ioctl(s, SIOCGIFFLAGS, &ifr, &ifrlen) < 0) { syslog(LOG_DEBUG, "ioctl(s, SIOCGIFFLAGS, ...): %m"); close(s); return -1; } if ((ifr.ifr_flags & IFF_UP) == 0) { syslog(LOG_DEBUG, "network interface %s is down", ifname); close(s); return -1; } strncpy(ifr.ifr_name, ifname, IFNAMSIZ); if(ioctl(s, SIOCGIFADDR, &ifr, &ifrlen) < 0) { syslog(LOG_ERR, "ioctl(s, SIOCGIFADDR, ...): %m"); close(s); return -1; } ifaddr = (struct sockaddr_in *)&ifr.ifr_addr; if(addr) *addr = ifaddr->sin_addr; if(buf) { if(!inet_ntop(AF_INET, &ifaddr->sin_addr, buf, len)) { syslog(LOG_ERR, "inet_ntop(): %m"); close(s); return -1; } } if(mask) { strncpy(ifr.ifr_name, ifname, IFNAMSIZ); if(ioctl(s, SIOCGIFNETMASK, &ifr, &ifrlen) < 0) { syslog(LOG_ERR, "ioctl(s, SIOCGIFNETMASK, ...): %m"); close(s); return -1; } #ifdef ifr_netmask *mask = ((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr; #else *mask = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr; #endif } close(s); #else /* ifndef USE_GETIFADDRS */ /* Works for all address families (both ip v4 and ip v6) */ struct ifaddrs * ifap; struct ifaddrs * ife; if(!ifname || ifname[0]=='\0') return -1; if(getifaddrs(&ifap)<0) { syslog(LOG_ERR, "getifaddrs: %m"); return -1; } for(ife = ifap; ife; ife = ife->ifa_next) { /* skip other interfaces if one was specified */ if(ifname && (0 != strcmp(ifname, ife->ifa_name))) continue; if(ife->ifa_addr == NULL) continue; switch(ife->ifa_addr->sa_family) { case AF_INET: if(buf) { inet_ntop(ife->ifa_addr->sa_family, &((struct sockaddr_in *)ife->ifa_addr)->sin_addr, buf, len); } if(addr) *addr = ((struct sockaddr_in *)ife->ifa_addr)->sin_addr; if(mask) *mask = ((struct sockaddr_in *)ife->ifa_netmask)->sin_addr; break; /* case AF_INET6: inet_ntop(ife->ifa_addr->sa_family, &((struct sockaddr_in6 *)ife->ifa_addr)->sin6_addr, buf, len); */ } } freeifaddrs(ifap); #endif return 0; } #ifdef ENABLE_PCP int getifaddr_in6(const char * ifname, int af, struct in6_addr * addr) { #if defined(ENABLE_IPV6) || defined(USE_GETIFADDRS) struct ifaddrs * ifap; struct ifaddrs * ife; #ifdef ENABLE_IPV6 const struct sockaddr_in6 * tmpaddr; #endif /* ENABLE_IPV6 */ int found = 0; if(!ifname || ifname[0]=='\0') return -1; if(getifaddrs(&ifap)<0) { syslog(LOG_ERR, "getifaddrs: %m"); return -1; } for(ife = ifap; ife && !found; ife = ife->ifa_next) { /* skip other interfaces if one was specified */ if(ifname && (0 != strcmp(ifname, ife->ifa_name))) continue; if(ife->ifa_addr == NULL) continue; if (ife->ifa_addr->sa_family != af) continue; switch(ife->ifa_addr->sa_family) { case AF_INET: /* IPv4-mapped IPv6 address ::ffff:1.2.3.4 */ memset(addr->s6_addr, 0, 10); addr->s6_addr[10] = 0xff; addr->s6_addr[11] = 0xff; memcpy(addr->s6_addr + 12, &(((struct sockaddr_in *)ife->ifa_addr)->sin_addr.s_addr), 4); found = 1; break; #ifdef ENABLE_IPV6 case AF_INET6: tmpaddr = (const struct sockaddr_in6 *)ife->ifa_addr; if(!IN6_IS_ADDR_LOOPBACK(&tmpaddr->sin6_addr) && !IN6_IS_ADDR_LINKLOCAL(&tmpaddr->sin6_addr)) { memcpy(addr->s6_addr, &tmpaddr->sin6_addr, 16); found = 1; } break; #endif /* ENABLE_IPV6 */ } } freeifaddrs(ifap); return (found ? 0 : -1); #else /* defined(ENABLE_IPV6) || defined(USE_GETIFADDRS) */ /* IPv4 only */ struct in_addr addr4; if(af != AF_INET) return -1; if(getifaddr(ifname, NULL, 0, &addr4, NULL) < 0) return -1; /* IPv4-mapped IPv6 address ::ffff:1.2.3.4 */ memset(addr->s6_addr, 0, 10); addr->s6_addr[10] = 0xff; addr->s6_addr[11] = 0xff; memcpy(addr->s6_addr + 12, &addr4.s_addr, 4); return 0; #endif } #endif /* ENABLE_PCP */ #ifdef ENABLE_IPV6 int find_ipv6_addr(const char * ifname, char * dst, int n) { struct ifaddrs * ifap; struct ifaddrs * ife; const struct sockaddr_in6 * addr; char buf[64]; int r = 0; if(!dst) return -1; if(getifaddrs(&ifap)<0) { syslog(LOG_ERR, "getifaddrs: %m"); return -1; } for(ife = ifap; ife; ife = ife->ifa_next) { /* skip other interfaces if one was specified */ if(ifname && (0 != strcmp(ifname, ife->ifa_name))) continue; if(ife->ifa_addr == NULL) continue; if(ife->ifa_addr->sa_family == AF_INET6) { addr = (const struct sockaddr_in6 *)ife->ifa_addr; if(!IN6_IS_ADDR_LOOPBACK(&addr->sin6_addr) && !IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) { inet_ntop(ife->ifa_addr->sa_family, &addr->sin6_addr, buf, sizeof(buf)); /* add brackets */ snprintf(dst, n, "[%s]", buf); r = 1; } } } freeifaddrs(ifap); return r; } #endif