/*
* Copyright (c) 1996, 1998-2005, 2007-2014
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
*/
/*
* Suppress 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 <config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
# include <sys/sockio.h>
#endif
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
# include <memory.h>
# endif
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif /* HAVE_STDBOOL_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <netdb.h>
#include <errno.h>
#ifdef _ISC
# include <sys/stream.h>
# include <sys/sioctl.h>
# include <sys/stropts.h>
# 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 <net/soioctl.h>
#endif /* _MIPS */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#ifdef HAVE_GETIFADDRS
# include <ifaddrs.h>
#endif
#define DEFAULT_TEXT_DOMAIN "sudo"
#include "gettext.h" /* must be included before missing.h */
#include "missing.h"
#include "alloc.h"
#include "fatal.h"
#include "sudo_conf.h"
#include "sudo_debug.h"
/* Minix apparently lacks IFF_LOOPBACK */
#ifndef IFF_LOOPBACK
# define IFF_LOOPBACK 0
#endif
#ifndef INET6_ADDRSTRLEN
# define INET6_ADDRSTRLEN 46
#endif
#ifdef HAVE_GETIFADDRS
/*
* Fill in the interfaces string with the machine's ip addresses and netmasks
* and return the number of interfaces found.
*/
int
get_net_ifs(char **addrinfo)
{
struct ifaddrs *ifa, *ifaddrs;
struct sockaddr_in *sin;
#ifdef HAVE_STRUCT_IN6_ADDR
struct sockaddr_in6 *sin6;
char addrbuf[INET6_ADDRSTRLEN];
#endif
int ailen, len, num_interfaces = 0;
char *cp;
debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
if (!sudo_conf_probe_interfaces() || getifaddrs(&ifaddrs) != 0)
debug_return_int(0);
/* Allocate space for the interfaces info string. */
for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
/* Skip interfaces marked "down" and "loopback". */
if (ifa->ifa_addr == NULL || ifa->ifa_netmask == 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_STRUCT_IN6_ADDR
case AF_INET6:
#endif
num_interfaces++;
break;
}
}
if (num_interfaces == 0)
debug_return_int(0);
ailen = num_interfaces * 2 * INET6_ADDRSTRLEN;
*addrinfo = cp = emalloc(ailen);
/* Store the IP addr/netmask pairs. */
for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
/* Skip interfaces marked "down" and "loopback". */
if (ifa->ifa_addr == NULL || ifa->ifa_netmask == 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;
len = snprintf(cp, ailen - (*addrinfo - cp),
"%s%s/", cp == *addrinfo ? "" : " ",
inet_ntoa(sin->sin_addr));
if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
warningx(U_("load_interfaces: overflow detected"));
goto done;
}
cp += len;
sin = (struct sockaddr_in *)ifa->ifa_netmask;
len = snprintf(cp, ailen - (*addrinfo - cp),
"%s", inet_ntoa(sin->sin_addr));
if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
warningx(U_("load_interfaces: overflow detected"));
goto done;
}
cp += len;
break;
#ifdef HAVE_STRUCT_IN6_ADDR
case AF_INET6:
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
len = snprintf(cp, ailen - (*addrinfo - cp),
"%s%s/", cp == *addrinfo ? "" : " ", addrbuf);
if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
warningx(U_("load_interfaces: overflow detected"));
goto done;
}
cp += len;
sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
inet_ntop(AF_INET6, &sin6->sin6_addr, addrbuf, sizeof(addrbuf));
len = snprintf(cp, ailen - (*addrinfo - cp), "%s", addrbuf);
if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
warningx(U_("load_interfaces: overflow detected"));
goto done;
}
cp += len;
break;
#endif /* HAVE_STRUCT_IN6_ADDR */
}
}
done:
#ifdef HAVE_FREEIFADDRS
freeifaddrs(ifaddrs);
#else
efree(ifaddrs);
#endif
debug_return_int(num_interfaces);
}
#elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
/*
* Allocate and fill in the interfaces global variable with the
* machine's ip addresses and netmasks.
*/
int
get_net_ifs(char **addrinfo)
{
struct ifconf *ifconf;
struct ifreq *ifr, ifr_tmp;
struct sockaddr_in *sin;
int ailen, i, len, n, sock, num_interfaces = 0;
size_t buflen = sizeof(struct ifconf) + BUFSIZ;
char *cp, *previfname = "", *ifconf_buf = NULL;
#ifdef _ISC
struct strioctl strioctl;
#endif /* _ISC */
debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
if (!sudo_conf_probe_interfaces())
debug_return_int(0);
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0)
fatal(U_("unable to open socket"));
/*
* Get interface configuration or return.
*/
for (;;) {
ifconf_buf = emalloc(buflen);
ifconf = (struct ifconf *) ifconf_buf;
ifconf->ifc_len = buflen - sizeof(struct ifconf);
ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
#ifdef _ISC
STRSET(SIOCGIFCONF, (caddr_t) ifconf, buflen);
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 */
goto done;
/* Break out of loop if we have a big enough buffer. */
if (ifconf->ifc_len + sizeof(struct ifreq) < buflen)
break;
buflen += BUFSIZ;
efree(ifconf_buf);
}
/* Allocate space for the maximum number of interfaces that could exist. */
if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
debug_return_int(0);
ailen = n * 2 * INET6_ADDRSTRLEN;
*addrinfo = cp = emalloc(ailen);
/* 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_STRUCT_SOCKADDR_SA_LEN
if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
#endif /* HAVE_STRUCT_SOCKADDR_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;
len = snprintf(cp, ailen - (*addrinfo - cp),
"%s%s/", cp == *addrinfo ? "" : " ",
inet_ntoa(sin->sin_addr));
if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
warningx(U_("load_interfaces: overflow detected"));
goto done;
}
cp += len;
/* Stash the name of the interface we saved. */
previfname = ifr->ifr_name;
/* Get the netmask. */
memset(&ifr_tmp, 0, sizeof(ifr_tmp));
strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
#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;
sin->sin_addr.s_addr = htonl(IN_CLASSC_NET);
}
sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
len = snprintf(cp, ailen - (*addrinfo - cp),
"%s", inet_ntoa(sin->sin_addr));
if (len <= 0 || len >= ailen - (*addrinfo - cp)) {
warningx(U_("load_interfaces: overflow detected"));
goto done;
}
cp += len;
num_interfaces++;
}
done:
efree(ifconf_buf);
(void) close(sock);
debug_return_int(num_interfaces);
}
#else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
/*
* Stub function for those without SIOCGIFCONF or getifaddrs()
*/
int
get_net_ifs(char **addrinfo)
{
debug_decl(get_net_ifs, SUDO_DEBUG_NETIF)
debug_return_int(0);
}
#endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
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