286 lines
7.3 KiB
C
286 lines
7.3 KiB
C
/*
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* CU sudo version 1.3.1
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Please send bugs, changes, problems to sudo-bugs@cs.colorado.edu
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*
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*******************************************************************
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*
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* This module contains load_interfaces() a function that
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* fills the interfaces global with a list of active ip
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* addresses and their associated netmasks.
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*
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* Todd C. Miller Mon May 1 20:48:43 MDT 1995
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*/
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#ifndef lint
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static char rcsid[] = "$Id$";
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#endif /* lint */
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#include "config.h"
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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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#endif /* STDC_HEADERS */
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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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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#ifdef HAVE_MALLOC_H
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#include <malloc.h>
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#endif /* HAVE_MALLOC_H */
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#include <netdb.h>
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#include <errno.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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#ifdef HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#else
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#include <sys/ioctl.h>
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#endif /* HAVE_SYS_SOCKIO_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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#include <net/errno.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 <sys/time.h>
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#include <net/if.h>
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#include "sudo.h"
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#include "options.h"
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#include "version.h"
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#if !defined(STDC_HEADERS) && !defined(__GNUC__)
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extern char *malloc __P((size_t));
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#endif /* !STDC_HEADERS && !__GNUC__ */
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/*
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* Globals
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*/
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struct interface *interfaces;
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int num_interfaces = 0;
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extern int Argc;
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extern char **Argv;
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#ifdef SIOCGIFCONF
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/**********************************************************************
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*
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* load_interfaces()
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*
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* This function sets the interfaces global variable
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* and sets the constituent ip addrs and netmasks.
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*/
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void load_interfaces()
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{
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unsigned long localhost_mask;
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struct ifconf *ifconf;
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char ifconf_buf[sizeof(struct ifconf) + BUFSIZ];
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struct ifreq ifreq;
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struct sockaddr_in *sin;
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char buf[BUFSIZ];
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int sock, n, i;
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#ifdef _ISC
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struct strioctl strioctl;
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#endif /* _ISC */
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/* so we can skip localhost and its ilk */
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localhost_mask = inet_addr("127.0.0.0");
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock < 0) {
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perror("socket");
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exit(1);
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}
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/*
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* get interface configuration or return (leaving interfaces NULL)
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*/
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ifconf = (struct ifconf *) ifconf_buf;
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ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
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ifconf->ifc_len = sizeof(ifconf_buf) - sizeof(struct ifconf);
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#ifdef _ISC
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STRSET(SIOCGIFCONF, (caddr_t) ifconf, sizeof(ifconf_buf));
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if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
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/* networking probably not installed in kernel */
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return;
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}
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#else
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if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0) {
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/* networking probably not installed in kernel */
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return;
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}
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#endif /* _ISC */
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/*
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* get the maximum number of interfaces that *could* exist.
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*/
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n = ifconf->ifc_len / sizeof(struct ifreq);
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/*
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* malloc() space for interfaces array
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*/
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interfaces = (struct interface *) malloc(sizeof(struct interface) * n);
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if (interfaces == NULL) {
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perror("malloc");
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(void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
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exit(1);
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}
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/*
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* for each interface, get the ip address and netmask
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*/
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for (i = 0; i < ifconf->ifc_len; ) {
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/* setup ifreq struct */
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ifreq = *((struct ifreq *) &ifconf->ifc_buf[i]);
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/* set i to the subscript of the next interface */
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#ifdef HAVE_SA_LEN
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if (ifreq.ifr_addr.sa_len > sizeof(ifreq.ifr_addr))
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i += sizeof(ifreq.ifr_name) + ifreq.ifr_addr.sa_len;
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else
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#endif /* HAVE_SA_LEN */
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i += sizeof(ifreq);
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/* get the ip address */
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#ifdef _ISC
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STRSET(SIOCGIFADDR, (caddr_t) &ifreq, sizeof(ifreq));
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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, SIOCGIFADDR, (caddr_t) &ifreq)) {
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#endif /* _ISC */
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/* non-fatal error if interface is down or not supported */
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if (errno == EADDRNOTAVAIL || errno == ENXIO || errno == EAFNOSUPPORT)
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continue;
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(void) fprintf(stderr, "%s: Error, ioctl: SIOCGIFADDR ", Argv[0]);
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perror("");
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exit(1);
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}
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sin = (struct sockaddr_in *) &ifreq.ifr_addr;
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/* make sure we don't have a dup (usually consecutive) */
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if (num_interfaces && interfaces[num_interfaces - 1].addr.s_addr ==
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sin->sin_addr.s_addr)
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continue;
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/* store the ip address */
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interfaces[num_interfaces].addr.s_addr = sin->sin_addr.s_addr;
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/* get the netmask */
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#ifdef SIOCGIFNETMASK
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#ifdef _ISC
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STRSET(SIOCGIFNETMASK, (caddr_t) &ifreq, sizeof(ifreq));
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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) &ifreq) == 0) {
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#endif /* _ISC */
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/* store the netmask */
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interfaces[num_interfaces].netmask.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.s_addr))
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interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSC_NET);
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else if (IN_CLASSB(interfaces[num_interfaces].addr.s_addr))
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interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSB_NET);
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else
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interfaces[num_interfaces].netmask.s_addr = htonl(IN_CLASSA_NET);
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}
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/* avoid localhost and friends */
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if ((interfaces[num_interfaces].addr.s_addr &
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interfaces[num_interfaces].netmask.s_addr) == localhost_mask)
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continue;
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num_interfaces++;
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}
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/* if there were bogus entries, realloc the array */
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if (n != num_interfaces) {
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interfaces = (struct interface *) realloc(interfaces,
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sizeof(struct interface) * num_interfaces);
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if (interfaces == NULL) {
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perror("realloc");
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(void) fprintf(stderr, "%s: cannot allocate memory!\n", Argv[0]);
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exit(1);
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}
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}
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}
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/**********************************************************************
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*
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* next_if()
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*
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* This function returns a pointer to the next struct ifreq *
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* in the list.
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*/
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static struct ifreq *next_if(cur)
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struct ifreq *cur;
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{
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struct ifreq *next;
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u_char sa_len;
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#ifdef HAVE_SA_LEN
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sa_len = cur->ifr_addr.sa_len;
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if (sa_len > sizeof(cur->ifr_ifru))
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next = (struct ifreq *) ((caddr_t) cur + sizeof(cur->ifr_name) + sa_len);
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else
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#endif /* HAVE_SA_LEN */
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next = (struct ifreq *) ((caddr_t) cur + sizeof(cur->ifr_name) + sizeof(cur->ifr_ifru));
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return(next);
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}
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#else /* SIOCGIFCONF */
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/**********************************************************************
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*
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* 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 load_interfaces()
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{
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return;
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}
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#endif /* SIOCGIFCONF */
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