275 lines
7.4 KiB
C
275 lines
7.4 KiB
C
/*
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* CU sudo version 1.5.7
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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@courtesan.com
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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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#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
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#include <malloc.h>
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#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
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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 <net/if.h>
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#include "sudo.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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extern char *realloc __P((VOID *, 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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#if defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
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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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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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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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for (;;) {
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ifconf_buf = ifconf_buf ? realloc(ifconf_buf, len) : malloc(len);
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if (ifconf_buf == NULL) {
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perror("malloc");
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exit(1);
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}
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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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/* networking may not be installed in kernel */
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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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if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0) {
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#endif /* _ISC */
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(void) free(ifconf_buf);
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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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/*
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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, store the ip address and netmask
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*/
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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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/* skip non-ip things */
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if (ifr->ifr_addr.sa_family != AF_INET)
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continue;
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/*
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* make sure the interface is up, skip if not.
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*/
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#ifdef SIOCGIFFLAGS
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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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#endif
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ifr_tmp = *ifr;
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/* skip interfaces marked "down" and "loopback" */
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if (!(ifr_tmp.ifr_flags & IFF_UP) || (ifr_tmp.ifr_flags & IFF_LOOPBACK))
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continue;
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/* store the ip address */
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sin = (struct sockaddr_in *) &ifr->ifr_addr;
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interfaces[num_interfaces].addr.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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(void) 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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#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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/* 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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/* only now can we be sure it was a good/interesting interface */
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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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/* it is unlikely that num_interfaces will be 0 but who knows... */
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if (num_interfaces != 0) {
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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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} else {
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(void) free(interfaces);
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}
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}
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(void) free(ifconf_buf);
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}
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#else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
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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 && !STUB_LOAD_INTERFACES */
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