355 lines
9.5 KiB
C
355 lines
9.5 KiB
C
/*
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* Copyright (c) 1996, 1998-2005, 2007-2009
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* Todd C. Miller <Todd.Miller@courtesan.com>
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*
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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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*
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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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*
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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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*/
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/*
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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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*/
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#if defined(__osf__) && !defined(__cplusplus)
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struct mbuf;
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struct rtentry;
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#endif
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#include <config.h>
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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/time.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
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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# include <memory.h>
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# endif
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <netdb.h>
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#include <errno.h>
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#ifdef _ISC
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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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#endif /* _ISC */
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#ifdef _MIPS
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# include <net/soioctl.h>
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#endif /* _MIPS */
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#ifdef HAVE_GETIFADDRS
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# include <ifaddrs.h>
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#endif
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#include "sudo.h"
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#include "interfaces.h"
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/* Minix apparently lacks IFF_LOOPBACK */
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#ifndef IFF_LOOPBACK
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# define IFF_LOOPBACK 0
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#endif
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#ifdef HAVE_GETIFADDRS
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/*
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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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*/
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void
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load_interfaces()
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{
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struct ifaddrs *ifa, *ifaddrs;
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struct sockaddr_in *sin;
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#ifdef HAVE_IN6_ADDR
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struct sockaddr_in6 *sin6;
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#endif
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int i;
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if (getifaddrs(&ifaddrs))
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return;
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/* Allocate space for the interfaces list. */
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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 || !ISSET(ifa->ifa_flags, IFF_UP) ||
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ISSET(ifa->ifa_flags, IFF_LOOPBACK))
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continue;
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switch(ifa->ifa_addr->sa_family) {
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case AF_INET:
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#ifdef HAVE_IN6_ADDR
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case AF_INET6:
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#endif
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num_interfaces++;
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break;
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}
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}
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if (num_interfaces == 0)
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return;
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interfaces =
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(struct interface *) emalloc2(num_interfaces, sizeof(struct interface));
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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 || !ISSET(ifa->ifa_flags, IFF_UP) ||
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ISSET(ifa->ifa_flags, IFF_LOOPBACK))
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continue;
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switch(ifa->ifa_addr->sa_family) {
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case AF_INET:
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sin = (struct sockaddr_in *)ifa->ifa_addr;
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if (sin == NULL)
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continue;
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memcpy(&interfaces[i].addr, &sin->sin_addr,
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sizeof(struct in_addr));
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sin = (struct sockaddr_in *)ifa->ifa_netmask;
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if (sin == NULL)
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continue;
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memcpy(&interfaces[i].netmask, &sin->sin_addr,
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sizeof(struct in_addr));
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interfaces[i].family = AF_INET;
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i++;
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break;
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#ifdef HAVE_IN6_ADDR
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
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if (sin6 == NULL)
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continue;
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memcpy(&interfaces[i].addr, &sin6->sin6_addr,
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sizeof(struct in6_addr));
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sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
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if (sin6 == NULL)
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continue;
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memcpy(&interfaces[i].netmask, &sin6->sin6_addr,
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sizeof(struct in6_addr));
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interfaces[i].family = AF_INET6;
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i++;
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break;
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#endif /* HAVE_IN6_ADDR */
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}
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}
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#ifdef HAVE_FREEIFADDRS
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freeifaddrs(ifaddrs);
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#else
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efree(ifaddrs);
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#endif
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}
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#elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
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/*
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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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*/
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void
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load_interfaces()
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{
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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 sock, n, i;
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size_t len = sizeof(struct ifconf) + BUFSIZ;
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char *previfname = "", *ifconf_buf = NULL;
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#ifdef _ISC
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struct strioctl strioctl;
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#endif /* _ISC */
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock < 0)
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error(1, "cannot open socket");
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/*
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* Get interface configuration or return (leaving num_interfaces == 0)
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*/
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for (;;) {
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ifconf_buf = erealloc(ifconf_buf, len);
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ifconf = (struct ifconf *) ifconf_buf;
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ifconf->ifc_len = len - sizeof(struct ifconf);
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ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
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#ifdef _ISC
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STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
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if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
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#else
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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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#endif /* _ISC */
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efree(ifconf_buf);
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(void) close(sock);
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return;
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}
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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) < len)
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break;
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len += BUFSIZ;
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}
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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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return;
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interfaces = (struct interface *) emalloc2(n, sizeof(struct interface));
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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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#ifdef HAVE_SA_LEN
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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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continue;
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if (ifr->ifr_addr.sa_family != AF_INET)
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continue;
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#ifdef SIOCGIFFLAGS
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zero_bytes(&ifr_tmp, 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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#endif
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ifr_tmp = *ifr;
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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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continue;
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sin = (struct sockaddr_in *) &ifr->ifr_addr;
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interfaces[num_interfaces].addr.ip4.s_addr = sin->sin_addr.s_addr;
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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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zero_bytes(&ifr_tmp, 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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#ifdef SIOCGIFNETMASK
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#ifdef _ISC
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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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#else
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if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
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#endif /* _ISC */
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sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
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interfaces[num_interfaces].netmask.ip4.s_addr = sin->sin_addr.s_addr;
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} else {
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#else
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{
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#endif /* SIOCGIFNETMASK */
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if (IN_CLASSC(interfaces[num_interfaces].addr.ip4.s_addr))
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interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSC_NET);
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else if (IN_CLASSB(interfaces[num_interfaces].addr.ip4.s_addr))
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interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSB_NET);
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else
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interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSA_NET);
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}
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/* Only now can we be sure it was a good/interesting interface. */
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interfaces[num_interfaces].family = AF_INET;
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num_interfaces++;
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}
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/* If the expected size < real size, realloc the array. */
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if (n != num_interfaces) {
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if (num_interfaces != 0)
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interfaces = (struct interface *) erealloc3(interfaces,
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num_interfaces, sizeof(struct interface));
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else
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efree(interfaces);
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}
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efree(ifconf_buf);
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(void) close(sock);
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}
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#else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
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/*
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* Stub function for those without SIOCGIFCONF
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*/
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void
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load_interfaces()
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{
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return;
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}
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#endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
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void
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dump_interfaces()
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{
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int i;
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#ifdef HAVE_IN6_ADDR
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char addrbuf[INET6_ADDRSTRLEN], maskbuf[INET6_ADDRSTRLEN];
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#endif
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puts("Local IP address and netmask pairs:");
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for (i = 0; i < num_interfaces; i++) {
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switch(interfaces[i].family) {
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case AF_INET:
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printf("\t%s / ", inet_ntoa(interfaces[i].addr.ip4));
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puts(inet_ntoa(interfaces[i].netmask.ip4));
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break;
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#ifdef HAVE_IN6_ADDR
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case AF_INET6:
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inet_ntop(AF_INET6, &interfaces[i].addr.ip6,
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addrbuf, sizeof(addrbuf));
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inet_ntop(AF_INET6, &interfaces[i].netmask.ip6,
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maskbuf, sizeof(maskbuf));
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printf("\t%s / %s\n", addrbuf, maskbuf);
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break;
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#endif /* HAVE_IN6_ADDR */
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}
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}
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}
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