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/*
* Copyright (c) 1996, 1998, 1999 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 4. Products derived from this software may not be called "Sudo" nor
* may "Sudo" appear in their names without specific prior written
* permission from the author.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* 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 "config.h"
#include <stdio.h>
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif /* STDC_HEADERS */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <netdb.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
#include <sys/sockio.h>
#endif
#ifdef _ISC
#include <sys/stream.h>
#include <sys/sioctl.h>
#include <sys/stropts.h>
#include <net/errno.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>
#include "sudo.h"
#include "interfaces.h"
#ifndef lint
static const char rcsid[] = "$Sudo: interfaces.c,v 1.59 1999/08/12 16:24:09 millert Exp $";
#endif /* lint */
#if 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) {
(void) fprintf(stderr, "%s: cannot open socket: %s\n",
Argv[0], strerror(errno));
exit(1);
}
/*
* 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));
/* Networking may not be installed in kernel... */
#ifdef _ISC
STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
#else
if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0) {
#endif /* _ISC */
free(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. */
n = ifconf->ifc_len / sizeof(struct ifreq);
interfaces = (struct interface *) emalloc(sizeof(struct interface) * n);
/* 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 (!(ifr_tmp.ifr_flags & IFF_UP) || (ifr_tmp.ifr_flags & IFF_LOOPBACK))
continue;
sin = (struct sockaddr_in *) &ifr->ifr_addr;
interfaces[num_interfaces].addr.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.s_addr = sin->sin_addr.s_addr;
} else {
#else
{
#endif /* SIOCGIFNETMASK */
if (IN_CLASSC(interfaces[num_interfaces].addr.s_addr))
interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSC_NET);
else if (IN_CLASSB(interfaces[num_interfaces].addr.s_addr))
interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSB_NET);
else
interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSA_NET);
}
/* Only now can we be sure it was a good/interesting interface. */
num_interfaces++;
}
/* If the expected size < real size, realloc the array. */
if (n != num_interfaces) {
if (num_interfaces != 0)
interfaces = (struct interface *) erealloc(interfaces,
sizeof(struct interface) * num_interfaces);
else
free(interfaces);
}
free(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 */
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