378 lines
10 KiB
C
378 lines
10 KiB
C
/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
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/*
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* Copyright (c) 1994, 1995, 1996, 1997, 1998
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/libpcap/fad-glifc.c,v 1.7 2008-01-30 09:35:48 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#ifdef HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#endif
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#include <sys/time.h> /* concession to AIX */
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struct mbuf; /* Squelch compiler warnings on some platforms for */
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struct rtentry; /* declarations in <net/if.h> */
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#include <net/if.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <errno.h>
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#include <memory.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "pcap-int.h"
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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/*
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* Get a list of all interfaces that are up and that we can open.
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* Returns -1 on error, 0 otherwise.
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* The list, as returned through "alldevsp", may be null if no interfaces
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* were up and could be opened.
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*
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* This is the implementation used on platforms that have SIOCGLIFCONF
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* but don't have "getifaddrs()". (Solaris 8 and later; we use
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* SIOCGLIFCONF rather than SIOCGIFCONF in order to get IPv6 addresses.)
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*/
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int
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pcap_findalldevs_interfaces(pcap_if_t **alldevsp, char *errbuf)
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{
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pcap_if_t *devlist = NULL;
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register int fd4, fd6, fd;
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register struct lifreq *ifrp, *ifend;
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struct lifnum ifn;
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struct lifconf ifc;
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char *buf = NULL;
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unsigned buf_size;
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#ifdef HAVE_SOLARIS
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char *p, *q;
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#endif
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struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr;
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struct sockaddr *netmask, *broadaddr, *dstaddr;
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int ret = 0;
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/*
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* Create a socket from which to fetch the list of interfaces,
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* and from which to fetch IPv4 information.
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*/
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fd4 = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd4 < 0) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"socket: %s", pcap_strerror(errno));
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return (-1);
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}
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/*
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* Create a socket from which to fetch IPv6 information.
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*/
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fd6 = socket(AF_INET6, SOCK_DGRAM, 0);
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if (fd6 < 0) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"socket: %s", pcap_strerror(errno));
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(void)close(fd4);
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return (-1);
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}
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/*
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* How many entries will SIOCGLIFCONF return?
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*/
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ifn.lifn_family = AF_UNSPEC;
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ifn.lifn_flags = 0;
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ifn.lifn_count = 0;
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if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"SIOCGLIFNUM: %s", pcap_strerror(errno));
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(void)close(fd6);
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(void)close(fd4);
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return (-1);
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}
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/*
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* Allocate a buffer for those entries.
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*/
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buf_size = ifn.lifn_count * sizeof (struct lifreq);
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buf = malloc(buf_size);
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if (buf == NULL) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"malloc: %s", pcap_strerror(errno));
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(void)close(fd6);
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(void)close(fd4);
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return (-1);
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}
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/*
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* Get the entries.
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*/
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ifc.lifc_len = buf_size;
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ifc.lifc_buf = buf;
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ifc.lifc_family = AF_UNSPEC;
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ifc.lifc_flags = 0;
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memset(buf, 0, buf_size);
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if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"SIOCGLIFCONF: %s", pcap_strerror(errno));
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(void)close(fd6);
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(void)close(fd4);
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free(buf);
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return (-1);
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}
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/*
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* Loop over the entries.
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*/
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ifrp = (struct lifreq *)buf;
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ifend = (struct lifreq *)(buf + ifc.lifc_len);
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for (; ifrp < ifend; ifrp++) {
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/*
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* IPv6 or not?
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*/
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if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6)
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fd = fd6;
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else
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fd = fd4;
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/*
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* Skip entries that begin with "dummy".
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* XXX - what are these? Is this Linux-specific?
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* Are there platforms on which we shouldn't do this?
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*/
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if (strncmp(ifrp->lifr_name, "dummy", 5) == 0)
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continue;
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#ifdef HAVE_SOLARIS
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/*
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* Skip entries that have a ":" followed by a number
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* at the end - those are Solaris virtual interfaces
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* on which you can't capture.
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*/
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p = strchr(ifrp->lifr_name, ':');
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if (p != NULL) {
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/*
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* We have a ":"; is it followed by a number?
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*/
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while (isdigit((unsigned char)*p))
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p++;
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if (*p == '\0') {
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/*
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* All digits after the ":" until the end.
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*/
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continue;
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}
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}
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#endif
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/*
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* Get the flags for this interface, and skip it if it's
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* not up.
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*/
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strncpy(ifrflags.lifr_name, ifrp->lifr_name,
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sizeof(ifrflags.lifr_name));
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if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) {
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if (errno == ENXIO)
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continue;
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"SIOCGLIFFLAGS: %.*s: %s",
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(int)sizeof(ifrflags.lifr_name),
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ifrflags.lifr_name,
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pcap_strerror(errno));
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ret = -1;
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break;
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}
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if (!(ifrflags.lifr_flags & IFF_UP))
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continue;
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/*
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* Get the netmask for this address on this interface.
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*/
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strncpy(ifrnetmask.lifr_name, ifrp->lifr_name,
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sizeof(ifrnetmask.lifr_name));
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memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr,
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sizeof(ifrnetmask.lifr_addr));
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if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) {
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if (errno == EADDRNOTAVAIL) {
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/*
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* Not available.
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*/
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netmask = NULL;
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} else {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"SIOCGLIFNETMASK: %.*s: %s",
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(int)sizeof(ifrnetmask.lifr_name),
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ifrnetmask.lifr_name,
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pcap_strerror(errno));
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ret = -1;
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break;
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}
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} else
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netmask = (struct sockaddr *)&ifrnetmask.lifr_addr;
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/*
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* Get the broadcast address for this address on this
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* interface (if any).
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*/
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if (ifrflags.lifr_flags & IFF_BROADCAST) {
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strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name,
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sizeof(ifrbroadaddr.lifr_name));
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memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr,
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sizeof(ifrbroadaddr.lifr_addr));
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if (ioctl(fd, SIOCGLIFBRDADDR,
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(char *)&ifrbroadaddr) < 0) {
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if (errno == EADDRNOTAVAIL) {
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/*
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* Not available.
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*/
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broadaddr = NULL;
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} else {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"SIOCGLIFBRDADDR: %.*s: %s",
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(int)sizeof(ifrbroadaddr.lifr_name),
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ifrbroadaddr.lifr_name,
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pcap_strerror(errno));
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ret = -1;
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break;
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}
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} else
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broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr;
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} else {
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/*
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* Not a broadcast interface, so no broadcast
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* address.
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*/
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broadaddr = NULL;
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}
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/*
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* Get the destination address for this address on this
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* interface (if any).
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*/
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if (ifrflags.lifr_flags & IFF_POINTOPOINT) {
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strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name,
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sizeof(ifrdstaddr.lifr_name));
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memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr,
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sizeof(ifrdstaddr.lifr_addr));
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if (ioctl(fd, SIOCGLIFDSTADDR,
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(char *)&ifrdstaddr) < 0) {
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if (errno == EADDRNOTAVAIL) {
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/*
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* Not available.
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*/
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dstaddr = NULL;
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} else {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"SIOCGLIFDSTADDR: %.*s: %s",
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(int)sizeof(ifrdstaddr.lifr_name),
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ifrdstaddr.lifr_name,
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pcap_strerror(errno));
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ret = -1;
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break;
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}
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} else
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dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr;
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} else
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dstaddr = NULL;
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#ifdef HAVE_SOLARIS
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/*
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* If this entry has a colon followed by a number at
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* the end, it's a logical interface. Those are just
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* the way you assign multiple IP addresses to a real
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* interface, so an entry for a logical interface should
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* be treated like the entry for the real interface;
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* we do that by stripping off the ":" and the number.
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*/
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p = strchr(ifrp->lifr_name, ':');
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if (p != NULL) {
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/*
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* We have a ":"; is it followed by a number?
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*/
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q = p + 1;
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while (isdigit((unsigned char)*q))
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q++;
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if (*q == '\0') {
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/*
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* All digits after the ":" until the end.
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* Strip off the ":" and everything after
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* it.
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*/
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*p = '\0';
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}
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}
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#endif
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/*
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* Add information for this address to the list.
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*/
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if (add_addr_to_iflist(&devlist, ifrp->lifr_name,
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ifrflags.lifr_flags, (struct sockaddr *)&ifrp->lifr_addr,
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sizeof (struct sockaddr_storage),
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netmask, sizeof (struct sockaddr_storage),
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broadaddr, sizeof (struct sockaddr_storage),
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dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) {
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ret = -1;
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break;
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}
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}
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free(buf);
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(void)close(fd6);
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(void)close(fd4);
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if (ret == -1) {
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/*
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* We had an error; free the list we've been constructing.
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*/
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if (devlist != NULL) {
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pcap_freealldevs(devlist);
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devlist = NULL;
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}
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}
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*alldevsp = devlist;
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return (ret);
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}
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