155 lines
4.6 KiB
C
155 lines
4.6 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[] =
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"@(#) $Header: /tcpdump/master/libpcap/fad-getad.c,v 1.1 2002-07-27 18:46:21 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/types.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ifaddrs.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 "getifaddrs()".
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*/
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int
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pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
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{
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pcap_if_t *devlist = NULL;
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struct ifaddrs *ifap, *ifa;
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struct sockaddr *broadaddr, *dstaddr;
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int ret = 0;
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/*
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* Get the list of interface addresses.
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*
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* Note: this won't return information about interfaces
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* with no addresses; are there any such interfaces
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* that would be capable of receiving packets?
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* (Interfaces incapable of receiving packets aren't
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* very interesting from libpcap's point of view.)
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*
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* LAN interfaces will probably have link-layer
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* addresses; I don't know whether all implementations
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* of "getifaddrs()" now, or in the future, will return
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* those.
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*/
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if (getifaddrs(&ifap) != 0) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"getifaddrs: %s", pcap_strerror(errno));
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return (-1);
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}
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for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
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/*
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* Is this interface up?
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*/
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if (!(ifa->ifa_flags & IFF_UP)) {
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/*
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* No, so don't add it to the list.
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*/
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continue;
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}
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/*
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* "ifa_broadaddr" may be non-null even on
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* non-broadcast interfaces; "ifa_dstaddr"
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* was, on at least one FreeBSD 4.1 system,
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* non-null on a non-point-to-point
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* interface.
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*/
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if (ifa->ifa_flags & IFF_BROADCAST)
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broadaddr = ifa->ifa_broadaddr;
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else
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broadaddr = NULL;
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if (ifa->ifa_flags & IFF_POINTOPOINT)
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dstaddr = ifa->ifa_dstaddr;
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else
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dstaddr = NULL;
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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, ifa->ifa_name,
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ifa->ifa_flags, ifa->ifa_addr, ifa->ifa_netmask,
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broadaddr, dstaddr, 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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freeifaddrs(ifap);
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if (ret != -1) {
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/*
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* We haven't had any errors yet; do any platform-specific
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* operations to add devices.
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*/
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if (pcap_platform_finddevs(&devlist, errbuf) < 0)
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ret = -1;
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}
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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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