/* * Copyright (c) 1996, 1998-2005 Todd C. Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F39502-99-1-0512. */ /* * Supress a warning w/ gcc on Digital UN*X. * The system headers should really do this.... */ #if defined(__osf__) && !defined(__cplusplus) struct mbuf; struct rtentry; #endif #include #include #include #include #include #include #if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF) # include #endif #include #ifdef STDC_HEADERS # include # include #else # ifdef HAVE_STDLIB_H # include # endif #endif /* STDC_HEADERS */ #ifdef HAVE_STRING_H # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS) # include # endif # include #else # ifdef HAVE_STRINGS_H # include # endif #endif /* HAVE_STRING_H */ #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #ifdef HAVE_ERR_H # include #else # include "emul/err.h" #endif /* HAVE_ERR_H */ #include #include #ifdef _ISC # include # include # include # define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\ strioctl.ic_dp=(param);\ strioctl.ic_timout=0;\ strioctl.ic_len=(len);} #endif /* _ISC */ #ifdef _MIPS # include #endif /* _MIPS */ #include #include #include #ifdef HAVE_GETIFADDRS # include #endif #include "sudo.h" #include "interfaces.h" #ifndef lint __unused static const char rcsid[] = "$Sudo: interfaces.c,v 1.72.2.7 2007/10/24 16:43:26 millert Exp $"; #endif /* lint */ #ifdef HAVE_GETIFADDRS /* * Allocate and fill in the interfaces global variable with the * machine's ip addresses and netmasks. */ void load_interfaces() { struct ifaddrs *ifa, *ifaddrs; struct sockaddr_in *sin; #ifdef HAVE_IN6_ADDR struct sockaddr_in6 *sin6; #endif int i; if (getifaddrs(&ifaddrs)) return; /* Allocate space for the interfaces list. */ for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) { /* Skip interfaces marked "down" and "loopback". */ if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK)) continue; switch(ifa->ifa_addr->sa_family) { case AF_INET: #ifdef HAVE_IN6_ADDR case AF_INET6: #endif num_interfaces++; break; } } if (num_interfaces == 0) return; interfaces = (struct interface *) emalloc2(num_interfaces, sizeof(struct interface)); /* Store the ip addr / netmask pairs. */ for (ifa = ifaddrs, i = 0; ifa != NULL; ifa = ifa -> ifa_next) { /* Skip interfaces marked "down" and "loopback". */ if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK)) continue; switch(ifa->ifa_addr->sa_family) { case AF_INET: sin = (struct sockaddr_in *)ifa->ifa_addr; memcpy(&interfaces[i].addr, &sin->sin_addr, sizeof(struct in_addr)); sin = (struct sockaddr_in *)ifa->ifa_netmask; memcpy(&interfaces[i].netmask, &sin->sin_addr, sizeof(struct in_addr)); interfaces[i].family = AF_INET; i++; break; #ifdef HAVE_IN6_ADDR case AF_INET6: sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; memcpy(&interfaces[i].addr, &sin6->sin6_addr, sizeof(struct in6_addr)); sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask; memcpy(&interfaces[i].netmask, &sin6->sin6_addr, sizeof(struct in6_addr)); interfaces[i].family = AF_INET6; i++; break; #endif /* HAVE_IN6_ADDR */ } } #ifdef HAVE_FREEIFADDRS freeifaddrs(ifaddrs); #else efree(ifaddrs); #endif } #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES) /* * Allocate and fill in the interfaces global variable with the * machine's ip addresses and netmasks. */ void load_interfaces() { struct ifconf *ifconf; struct ifreq *ifr, ifr_tmp; struct sockaddr_in *sin; int sock, n, i; size_t len = sizeof(struct ifconf) + BUFSIZ; char *previfname = "", *ifconf_buf = NULL; #ifdef _ISC struct strioctl strioctl; #endif /* _ISC */ sock = socket(AF_INET, SOCK_DGRAM, 0); if (sock < 0) err(1, "cannot open socket"); /* * Get interface configuration or return (leaving num_interfaces == 0) */ for (;;) { ifconf_buf = erealloc(ifconf_buf, len); ifconf = (struct ifconf *) ifconf_buf; ifconf->ifc_len = len - sizeof(struct ifconf); ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf)); #ifdef _ISC STRSET(SIOCGIFCONF, (caddr_t) ifconf, len); if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) { #else /* Note that some kernels return EINVAL if the buffer is too small */ if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL) { #endif /* _ISC */ efree(ifconf_buf); (void) close(sock); return; } /* Break out of loop if we have a big enough buffer. */ if (ifconf->ifc_len + sizeof(struct ifreq) < len) break; len += BUFSIZ; } /* Allocate space for the maximum number of interfaces that could exist. */ if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0) return; interfaces = (struct interface *) emalloc2(n, sizeof(struct interface)); /* For each interface, store the ip address and netmask. */ for (i = 0; i < ifconf->ifc_len; ) { /* Get a pointer to the current interface. */ ifr = (struct ifreq *) &ifconf->ifc_buf[i]; /* Set i to the subscript of the next interface. */ i += sizeof(struct ifreq); #ifdef HAVE_SA_LEN if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr)) i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr); #endif /* HAVE_SA_LEN */ /* Skip duplicates and interfaces with NULL addresses. */ sin = (struct sockaddr_in *) &ifr->ifr_addr; if (sin->sin_addr.s_addr == 0 || strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0) continue; if (ifr->ifr_addr.sa_family != AF_INET) continue; #ifdef SIOCGIFFLAGS memset(&ifr_tmp, 0, sizeof(ifr_tmp)); strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1); if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0) #endif ifr_tmp = *ifr; /* Skip interfaces marked "down" and "loopback". */ if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) || ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK)) continue; sin = (struct sockaddr_in *) &ifr->ifr_addr; interfaces[num_interfaces].addr.ip4.s_addr = sin->sin_addr.s_addr; /* Stash the name of the interface we saved. */ previfname = ifr->ifr_name; /* Get the netmask. */ (void) memset(&ifr_tmp, 0, sizeof(ifr_tmp)); strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1); #ifdef SIOCGIFNETMASK #ifdef _ISC STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp)); if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) { #else if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) { #endif /* _ISC */ sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr; interfaces[num_interfaces].netmask.ip4.s_addr = sin->sin_addr.s_addr; } else { #else { #endif /* SIOCGIFNETMASK */ if (IN_CLASSC(interfaces[num_interfaces].addr.ip4.s_addr)) interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSC_NET); else if (IN_CLASSB(interfaces[num_interfaces].addr.ip4.s_addr)) interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSB_NET); else interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSA_NET); } /* Only now can we be sure it was a good/interesting interface. */ interfaces[num_interfaces].family = AF_INET; num_interfaces++; } /* If the expected size < real size, realloc the array. */ if (n != num_interfaces) { if (num_interfaces != 0) interfaces = (struct interface *) erealloc3(interfaces, num_interfaces, sizeof(struct interface)); else efree(interfaces); } efree(ifconf_buf); (void) close(sock); } #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */ /* * Stub function for those without SIOCGIFCONF */ void load_interfaces() { return; } #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */ void dump_interfaces() { int i; #ifdef HAVE_IN6_ADDR char addrbuf[INET6_ADDRSTRLEN], maskbuf[INET6_ADDRSTRLEN]; #endif puts("Local IP address and netmask pairs:"); for (i = 0; i < num_interfaces; i++) { switch(interfaces[i].family) { case AF_INET: printf("\t%s / ", inet_ntoa(interfaces[i].addr.ip4)); puts(inet_ntoa(interfaces[i].netmask.ip4)); break; #ifdef HAVE_IN6_ADDR case AF_INET6: inet_ntop(AF_INET6, &interfaces[i].addr.ip6, addrbuf, sizeof(addrbuf)); inet_ntop(AF_INET6, &interfaces[i].netmask.ip6, maskbuf, sizeof(maskbuf)); printf("\t%s / %s\n", addrbuf, maskbuf); break; #endif /* HAVE_IN6_ADDR */ } } }