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* Copyright (c) 1996, 1998-2005, 2007-2010
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* Todd C. Miller <Todd.Miller@courtesan.com>
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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* Suppress a warning w/ gcc on Digital UN*X.
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* The system headers should really do this....
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#if defined(__osf__) && !defined(__cplusplus)
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
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# include <sys/sockio.h>
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#endif /* STDC_HEADERS */
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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#endif /* HAVE_STRING_H */
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#endif /* HAVE_STRINGS_H */
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#endif /* HAVE_UNISTD_H */
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# include <sys/stream.h>
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# include <sys/sioctl.h>
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# include <sys/stropts.h>
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# define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
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strioctl.ic_dp=(param);\
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strioctl.ic_timout=0;\
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strioctl.ic_len=(len);}
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# include <net/soioctl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#ifdef HAVE_GETIFADDRS
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#define DEFAULT_TEXT_DOMAIN "sudo"
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/* Minix apparently lacks IFF_LOOPBACK */
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# define IFF_LOOPBACK 0
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#ifndef INET6_ADDRSTRLEN
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# define INET6_ADDRSTRLEN 46
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#ifdef HAVE_GETIFADDRS
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* Fill in the interfaces string with the machine's ip addresses and netmasks
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* and return the number of interfaces found.
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get_net_ifs(char **addrinfo)
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struct ifaddrs *ifa, *ifaddrs;
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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char addrbuf[INET6_ADDRSTRLEN];
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int ailen, i, len, num_interfaces = 0;
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if (getifaddrs(&ifaddrs))
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/* Allocate space for the interfaces info string. */
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for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
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/* Skip interfaces marked "down" and "loopback". */
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if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL ||
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!ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK))
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switch (ifa->ifa_addr->sa_family) {
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if (num_interfaces == 0)
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ailen = num_interfaces * 2 * INET6_ADDRSTRLEN;
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*addrinfo = cp = emalloc(ailen);
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/* Store the IP addr/netmask pairs. */
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for (ifa = ifaddrs, i = 0; ifa != NULL; ifa = ifa -> ifa_next) {
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/* Skip interfaces marked "down" and "loopback". */
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if (ifa->ifa_addr == NULL || ifa->ifa_netmask == NULL ||
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!ISSET(ifa->ifa_flags, IFF_UP) || ISSET(ifa->ifa_flags, IFF_LOOPBACK))
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switch (ifa->ifa_addr->sa_family) {
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sin = (struct sockaddr_in *)ifa->ifa_addr;
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len = snprintf(cp, ailen - (*addrinfo - cp),
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"%s%s/", cp == *addrinfo ? "" : " ",
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inet_ntoa(sin->sin_addr));
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if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
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warningx(_("load_interfaces: overflow detected"));
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sin = (struct sockaddr_in *)ifa->ifa_netmask;
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len = snprintf(cp, ailen - (*addrinfo - cp),
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"%s", inet_ntoa(sin->sin_addr));
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if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
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warningx(_("load_interfaces: overflow detected"));
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sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
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inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
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len = snprintf(cp, ailen - (*addrinfo - cp),
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"%s%s/", cp == *addrinfo ? "" : " ", addrbuf);
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if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
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warningx(_("load_interfaces: overflow detected"));
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sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
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inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
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len = snprintf(cp, ailen - (*addrinfo - cp), "%s", addrbuf);
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if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
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warningx(_("load_interfaces: overflow detected"));
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#endif /* HAVE_IN6_ADDR */
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#ifdef HAVE_FREEIFADDRS
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freeifaddrs(ifaddrs);
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return num_interfaces;
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#elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
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* Allocate and fill in the interfaces global variable with the
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* machine's ip addresses and netmasks.
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get_net_ifs(char **addrinfo)
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struct ifconf *ifconf;
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struct ifreq *ifr, ifr_tmp;
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struct sockaddr_in *sin;
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int ailen, i, len, n, sock, num_interfaces = 0;
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size_t buflen = sizeof(struct ifconf) + BUFSIZ;
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char *cp, *previfname = "", *ifconf_buf = NULL;
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struct strioctl strioctl;
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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error(1, _("unable to open socket"));
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* Get interface configuration or return.
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ifconf_buf = emalloc(buflen);
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ifconf = (struct ifconf *) ifconf_buf;
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ifconf->ifc_len = buflen - sizeof(struct ifconf);
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ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
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STRSET(SIOCGIFCONF, (caddr_t) ifconf, buflen);
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if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0)
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/* Note that some kernels return EINVAL if the buffer is too small */
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if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL)
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/* Break out of loop if we have a big enough buffer. */
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if (ifconf->ifc_len + sizeof(struct ifreq) < buflen)
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/* Allocate space for the maximum number of interfaces that could exist. */
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if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
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ailen = n * 2 * INET6_ADDRSTRLEN;
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*addrinfo = cp = emalloc(ailen);
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/* For each interface, store the ip address and netmask. */
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for (i = 0; i < ifconf->ifc_len; ) {
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/* Get a pointer to the current interface. */
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ifr = (struct ifreq *) &ifconf->ifc_buf[i];
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/* Set i to the subscript of the next interface. */
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i += sizeof(struct ifreq);
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if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
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i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
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#endif /* HAVE_SA_LEN */
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/* Skip duplicates and interfaces with NULL addresses. */
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sin = (struct sockaddr_in *) &ifr->ifr_addr;
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if (sin->sin_addr.s_addr == 0 ||
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strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
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if (ifr->ifr_addr.sa_family != AF_INET)
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memset(&ifr_tmp, 0, sizeof(ifr_tmp));
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strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
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if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
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/* Skip interfaces marked "down" and "loopback". */
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if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
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ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
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sin = (struct sockaddr_in *) &ifr->ifr_addr;
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len = snprintf(cp, ailen - (*addrinfo - cp),
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"%s%s/", cp == *addrinfo ? "" : " ",
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inet_ntoa(sin->sin_addr));
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if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
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warningx(_("load_interfaces: overflow detected"));
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/* Stash the name of the interface we saved. */
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previfname = ifr->ifr_name;
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/* Get the netmask. */
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memset(&ifr_tmp, 0, sizeof(ifr_tmp));
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strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
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STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
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if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
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if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) < 0) {
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sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
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sin->sin_addr.s_addr = htonl(IN_CLASSC_NET);
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sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
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len = snprintf(cp, ailen - (*addrinfo - cp),
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"%s", inet_ntoa(sin->sin_addr));
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if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
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warningx(_("load_interfaces: overflow detected"));
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return num_interfaces;
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#else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
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* Stub function for those without SIOCGIFCONF or getifaddrs()
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get_net_ifs(char **addrinfo)
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#endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
added
removed
src/net_ifs.c
