mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-21 08:24:10 +01:00
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 2000
|
|
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the Computer Systems
|
|
* Engineering Group at Lawrence Berkeley Laboratory.
|
|
* 4. Neither the name of the University nor of the Laboratory may be used
|
|
* to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"@(#) $Id: findsaddr-linux.c,v 1.1 2000/11/23 20:17:12 leres Exp $ (LBL)";
|
|
#endif
|
|
|
|
/* XXX linux is different (as usual) */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/file.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#ifdef HAVE_SYS_SOCKIO_H
|
|
#include <sys/sockio.h>
|
|
#endif
|
|
#include <sys/time.h> /* concession to AIX */
|
|
|
|
#if __STDC__
|
|
struct mbuf;
|
|
struct rtentry;
|
|
#endif
|
|
|
|
#include <net/if.h>
|
|
#include <netinet/in.h>
|
|
|
|
#include <arpa/inet.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "gnuc.h"
|
|
#ifdef HAVE_OS_PROTO_H
|
|
#include "os-proto.h"
|
|
#endif
|
|
|
|
#include "findsaddr.h"
|
|
#include "ifaddrlist.h"
|
|
#include "traceroute.h"
|
|
|
|
static const char route[] = "/proc/net/route";
|
|
|
|
/*
|
|
* Return the source address for the given destination address
|
|
*/
|
|
const char *
|
|
findsaddr(register const struct sockaddr_in *to,
|
|
register struct sockaddr_in *from)
|
|
{
|
|
register int i, n;
|
|
register FILE *f;
|
|
register u_int32_t mask;
|
|
u_int32_t dest, tmask;
|
|
struct ifaddrlist *al;
|
|
char buf[256], tdevice[256], device[256];
|
|
static char errbuf[132];
|
|
|
|
if ((f = fopen(route, "r")) == NULL) {
|
|
sprintf(errbuf, "open %s: %.128s", route, strerror(errno));
|
|
return (errbuf);
|
|
}
|
|
|
|
/* Find the appropriate interface */
|
|
n = 0;
|
|
mask = 0;
|
|
device[0] = '\0';
|
|
while (fgets(buf, sizeof(buf), f) != NULL) {
|
|
++n;
|
|
if (n == 1 && strncmp(buf, "Iface", 5) == 0)
|
|
continue;
|
|
if ((i = sscanf(buf, "%s %x %*s %*s %*s %*s %*s %x",
|
|
tdevice, &dest, &tmask)) != 3)
|
|
return ("junk in buffer");
|
|
if ((to->sin_addr.s_addr & tmask) == dest &&
|
|
(tmask > mask || mask == 0)) {
|
|
mask = tmask;
|
|
strcpy(device, tdevice);
|
|
}
|
|
}
|
|
fclose(f);
|
|
|
|
if (device[0] == '\0')
|
|
return ("Can't find interface");
|
|
|
|
/* Get the interface address list */
|
|
if ((n = ifaddrlist(&al, errbuf)) < 0)
|
|
return (errbuf);
|
|
|
|
if (n == 0)
|
|
return ("Can't find any network interfaces");
|
|
|
|
/* Find our appropriate source address */
|
|
for (i = n; i > 0; --i, ++al)
|
|
if (strcmp(device, al->device) == 0)
|
|
break;
|
|
if (i <= 0) {
|
|
sprintf(errbuf, "Can't find interface \"%.32s\"", device);
|
|
return (errbuf);
|
|
}
|
|
|
|
setsin(from, al->addr);
|
|
return (NULL);
|
|
}
|