freebsd-src/usr.sbin/traceroute/ifaddrlist.c
2024-02-08 09:52:42 -07:00

161 lines
4.8 KiB
C

/*
* Copyright (c) 1997, 1998, 1999, 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.
*/
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/time.h> /* concession to AIX */
#if __STDC__
struct mbuf;
struct rtentry;
#endif
#include <net/if.h>
#include <netinet/in.h>
#include <ctype.h>
#include <errno.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ifaddrlist.h"
/*
* Return the interface list
*/
int
ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf)
{
register int fd, nipaddr;
size_t n;
register struct ifreq *ifrp, *ifend, *ifnext;
register struct sockaddr_in *sin;
register struct ifaddrlist *al;
struct ifconf ifc;
struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
#define MAX_IPADDR ((int)(sizeof(ibuf) / sizeof(ibuf[0])))
static struct ifaddrlist ifaddrlist[MAX_IPADDR];
char device[sizeof(ifr.ifr_name) + 1];
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
(void)sprintf(errbuf, "socket: %s", strerror(errno));
return (-1);
}
ifc.ifc_len = sizeof(ibuf);
ifc.ifc_buf = (caddr_t)ibuf;
if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
ifc.ifc_len < (int)sizeof(struct ifreq)) {
if (errno == EINVAL)
(void)sprintf(errbuf,
"SIOCGIFCONF: ifreq struct too small (%zu bytes)",
sizeof(ibuf));
else
(void)sprintf(errbuf, "SIOCGIFCONF: %s",
strerror(errno));
(void)close(fd);
return (-1);
}
ifrp = ibuf;
ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
al = ifaddrlist;
nipaddr = 0;
for (; ifrp < ifend; ifrp = ifnext) {
n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
if (n < sizeof(*ifrp))
ifnext = ifrp + 1;
else
ifnext = (struct ifreq *)((char *)ifrp + n);
if (ifrp->ifr_addr.sa_family != AF_INET)
continue;
/*
* Need a template to preserve address info that is
* used below to locate the next entry. (Otherwise,
* SIOCGIFFLAGS stomps over it because the requests
* are returned in a union.)
*/
strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
if (errno == ENXIO)
continue;
(void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s",
(int)sizeof(ifr.ifr_name), ifr.ifr_name,
strerror(errno));
(void)close(fd);
return (-1);
}
/* Must be up */
if ((ifr.ifr_flags & IFF_UP) == 0)
continue;
(void)strlcpy(device, ifr.ifr_name, sizeof(device));
#ifdef sun
/* Ignore sun virtual interfaces */
if (strchr(device, ':') != NULL)
continue;
#endif
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
(void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
device, strerror(errno));
(void)close(fd);
return (-1);
}
if (nipaddr >= MAX_IPADDR) {
(void)sprintf(errbuf, "Too many interfaces (%d)",
MAX_IPADDR);
(void)close(fd);
return (-1);
}
sin = (struct sockaddr_in *)&ifr.ifr_addr;
al->addr = sin->sin_addr.s_addr;
al->device = strdup(device);
++al;
++nipaddr;
}
(void)close(fd);
*ipaddrp = ifaddrlist;
return (nipaddr);
}