934 lines
24 KiB
C
934 lines
24 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/inet.c,v 1.79 2008-04-20 18:19:02 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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#ifdef WIN32
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#include <pcap-stdinc.h>
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#else /* WIN32 */
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#include <sys/param.h>
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#ifndef MSDOS
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#include <sys/file.h>
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#endif
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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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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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#endif /* WIN32 */
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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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#if !defined(WIN32) && !defined(__BORLANDC__)
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#include <unistd.h>
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#endif /* !WIN32 && !__BORLANDC__ */
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#else
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#define INT_MAX 2147483647
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#endif
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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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/* Not all systems have IFF_LOOPBACK */
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#ifdef IFF_LOOPBACK
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#define ISLOOPBACK(name, flags) ((flags) & IFF_LOOPBACK)
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#else
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#define ISLOOPBACK(name, flags) ((name)[0] == 'l' && (name)[1] == 'o' && \
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(isdigit((unsigned char)((name)[2])) || (name)[2] == '\0'))
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#endif
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struct sockaddr *
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dup_sockaddr(struct sockaddr *sa, size_t sa_length)
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{
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struct sockaddr *newsa;
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if ((newsa = malloc(sa_length)) == NULL)
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return (NULL);
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return (memcpy(newsa, sa, sa_length));
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}
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static int
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get_instance(const char *name)
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{
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const char *cp, *endcp;
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int n;
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if (strcmp(name, "any") == 0) {
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/*
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* Give the "any" device an artificially high instance
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* number, so it shows up after all other non-loopback
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* interfaces.
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*/
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return INT_MAX;
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}
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endcp = name + strlen(name);
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for (cp = name; cp < endcp && !isdigit((unsigned char)*cp); ++cp)
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continue;
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if (isdigit((unsigned char)*cp))
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n = atoi(cp);
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else
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n = 0;
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return (n);
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}
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int
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add_or_find_if(pcap_if_t **curdev_ret, pcap_if_t **alldevs, const char *name,
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u_int flags, const char *description, char *errbuf)
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{
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pcap_t *p;
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pcap_if_t *curdev, *prevdev, *nextdev;
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int this_instance;
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char open_errbuf[PCAP_ERRBUF_SIZE];
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/*
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* Is there already an entry in the list for this interface?
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*/
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for (curdev = *alldevs; curdev != NULL; curdev = curdev->next) {
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if (strcmp(name, curdev->name) == 0)
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break; /* yes, we found it */
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}
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if (curdev == NULL) {
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/*
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* No, we didn't find it.
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*
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* Can we open this interface for live capture?
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*
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* We do this check so that interfaces that are
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* supplied by the interface enumeration mechanism
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* we're using but that don't support packet capture
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* aren't included in the list. Loopback interfaces
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* on Solaris are an example of this; we don't just
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* omit loopback interfaces on all platforms because
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* you *can* capture on loopback interfaces on some
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* OSes.
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*
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* On OS X, we don't do this check if the device
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* name begins with "wlt"; at least some versions
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* of OS X offer monitor mode capturing by having
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* a separate "monitor mode" device for each wireless
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* adapter, rather than by implementing the ioctls
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* that {Free,Net,Open,DragonFly}BSD provide.
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* Opening that device puts the adapter into monitor
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* mode, which, at least for some adapters, causes
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* them to deassociate from the network with which
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* they're associated.
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*
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* Instead, we try to open the corresponding "en"
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* device (so that we don't end up with, for users
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* without sufficient privilege to open capture
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* devices, a list of adapters that only includes
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* the wlt devices).
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*/
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#ifdef __APPLE__
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if (strncmp(name, "wlt", 3) == 0) {
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char *en_name;
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size_t en_name_len;
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/*
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* Try to allocate a buffer for the "en"
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* device's name.
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*/
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en_name_len = strlen(name) - 1;
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en_name = malloc(en_name_len + 1);
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if (en_name == NULL) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"malloc: %s", pcap_strerror(errno));
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return (-1);
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}
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strcpy(en_name, "en");
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strcat(en_name, name + 3);
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p = pcap_open_live(en_name, 68, 0, 0, open_errbuf);
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free(en_name);
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} else
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#endif /* __APPLE */
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p = pcap_open_live(name, 68, 0, 0, open_errbuf);
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if (p == NULL) {
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/*
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* No. Don't bother including it.
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* Don't treat this as an error, though.
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*/
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*curdev_ret = NULL;
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return (0);
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}
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pcap_close(p);
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/*
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* Yes, we can open it.
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* Allocate a new entry.
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*/
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curdev = malloc(sizeof(pcap_if_t));
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if (curdev == NULL) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"malloc: %s", pcap_strerror(errno));
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return (-1);
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}
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/*
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* Fill in the entry.
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*/
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curdev->next = NULL;
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curdev->name = strdup(name);
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if (curdev->name == NULL) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"malloc: %s", pcap_strerror(errno));
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free(curdev);
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return (-1);
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}
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if (description != NULL) {
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/*
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* We have a description for this interface.
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*/
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curdev->description = strdup(description);
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if (curdev->description == NULL) {
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(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"malloc: %s", pcap_strerror(errno));
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free(curdev->name);
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free(curdev);
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return (-1);
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}
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} else {
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/*
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* We don't.
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*/
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curdev->description = NULL;
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}
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curdev->addresses = NULL; /* list starts out as empty */
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curdev->flags = 0;
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if (ISLOOPBACK(name, flags))
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curdev->flags |= PCAP_IF_LOOPBACK;
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/*
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* Add it to the list, in the appropriate location.
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* First, get the instance number of this interface.
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*/
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this_instance = get_instance(name);
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/*
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* Now look for the last interface with an instance number
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* less than or equal to the new interface's instance
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* number - except that non-loopback interfaces are
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* arbitrarily treated as having interface numbers less
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* than those of loopback interfaces, so the loopback
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* interfaces are put at the end of the list.
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*
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* We start with "prevdev" being NULL, meaning we're before
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* the first element in the list.
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*/
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prevdev = NULL;
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for (;;) {
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/*
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* Get the interface after this one.
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*/
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if (prevdev == NULL) {
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/*
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* The next element is the first element.
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*/
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nextdev = *alldevs;
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} else
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nextdev = prevdev->next;
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/*
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* Are we at the end of the list?
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*/
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if (nextdev == NULL) {
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/*
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* Yes - we have to put the new entry
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* after "prevdev".
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*/
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break;
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}
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/*
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* Is the new interface a non-loopback interface
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* and the next interface a loopback interface?
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*/
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if (!(curdev->flags & PCAP_IF_LOOPBACK) &&
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(nextdev->flags & PCAP_IF_LOOPBACK)) {
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/*
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* Yes, we should put the new entry
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* before "nextdev", i.e. after "prevdev".
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*/
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break;
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}
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/*
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* Is the new interface's instance number less
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* than the next interface's instance number,
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* and is it the case that the new interface is a
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* non-loopback interface or the next interface is
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* a loopback interface?
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*
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* (The goal of both loopback tests is to make
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* sure that we never put a loopback interface
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* before any non-loopback interface and that we
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* always put a non-loopback interface before all
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* loopback interfaces.)
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*/
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if (this_instance < get_instance(nextdev->name) &&
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(!(curdev->flags & PCAP_IF_LOOPBACK) ||
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(nextdev->flags & PCAP_IF_LOOPBACK))) {
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/*
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* Yes - we should put the new entry
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* before "nextdev", i.e. after "prevdev".
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*/
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break;
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}
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prevdev = nextdev;
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}
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/*
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* Insert before "nextdev".
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*/
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curdev->next = nextdev;
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/*
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* Insert after "prevdev" - unless "prevdev" is null,
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* in which case this is the first interface.
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*/
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if (prevdev == NULL) {
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/*
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* This is the first interface. Pass back a
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* pointer to it, and put "curdev" before
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* "nextdev".
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*/
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*alldevs = curdev;
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} else
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prevdev->next = curdev;
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}
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*curdev_ret = curdev;
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return (0);
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}
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/*
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* XXX - on FreeBSDs that support it, should it get the sysctl named
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* "dev.{adapter family name}.{adapter unit}.%desc" to get a description
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* of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800"
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* with my Cisco 350 card, so the name isn't entirely descriptive. The
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* "dev.an.0.%pnpinfo" has a better description, although one might argue
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* that the problem is really a driver bug - if it can find out that it's
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* a Cisco 340 or 350, rather than an old Aironet card, it should use
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* that in the description.
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*
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* Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD
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* and OpenBSD let you get a description, but it's not generated by the OS,
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* it's set with another ioctl that ifconfig supports; we use that to get
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* a description in FreeBSD and OpenBSD, but if there is no such
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* description available, it still might be nice to get some description
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* string based on the device type or something such as that.
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*
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* In OS X, the System Configuration framework can apparently return
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* names in 10.4 and later.
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*
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* It also appears that freedesktop.org's HAL offers an "info.product"
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* string, but the HAL specification says it "should not be used in any
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* UI" and "subsystem/capability specific properties" should be used
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* instead and, in any case, I think HAL is being deprecated in
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* favor of other stuff such as DeviceKit. DeviceKit doesn't appear
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* to have any obvious product information for devices, but maybe
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* I haven't looked hard enough.
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*
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* Using the System Configuration framework, or HAL, or DeviceKit, or
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* whatever, would require that libpcap applications be linked with
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* the frameworks/libraries in question. That shouldn't be a problem
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* for programs linking with the shared version of libpcap (unless
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* you're running on AIX - which I think is the only UN*X that doesn't
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* support linking a shared library with other libraries on which it
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* depends, and having an executable linked only with the first shared
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* library automatically pick up the other libraries when started -
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* and using HAL or whatever). Programs linked with the static
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* version of libpcap would have to use pcap-config with the --static
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* flag in order to get the right linker flags in order to pick up
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* the additional libraries/frameworks; those programs need that anyway
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* for libpcap 1.1 and beyond on Linux, as, by default, it requires
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* -lnl.
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*
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* Do any other UN*Xes, or desktop environments support getting a
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* description?
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*/
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int
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add_addr_to_iflist(pcap_if_t **alldevs, const char *name, u_int flags,
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struct sockaddr *addr, size_t addr_size,
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struct sockaddr *netmask, size_t netmask_size,
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struct sockaddr *broadaddr, size_t broadaddr_size,
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struct sockaddr *dstaddr, size_t dstaddr_size,
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char *errbuf)
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{
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pcap_if_t *curdev;
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char *description = NULL;
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pcap_addr_t *curaddr, *prevaddr, *nextaddr;
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#ifdef SIOCGIFDESCR
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int s;
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struct ifreq ifrdesc;
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#ifndef IFDESCRSIZE
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size_t descrlen = 64;
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#else
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size_t descrlen = IFDESCRSIZE;
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#endif /* IFDESCRSIZE */
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#endif /* SIOCGIFDESCR */
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#ifdef SIOCGIFDESCR
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/*
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* Get the description for the interface.
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*/
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memset(&ifrdesc, 0, sizeof ifrdesc);
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strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name);
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s >= 0) {
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#ifdef __FreeBSD__
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|
/*
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|
* On FreeBSD, if the buffer isn't big enough for the
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|
* description, the ioctl succeeds, but the description
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|
* isn't copied, ifr_buffer.length is set to the description
|
|
* length, and ifr_buffer.buffer is set to NULL.
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*/
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for (;;) {
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free(description);
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if ((description = malloc(descrlen)) != NULL) {
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ifrdesc.ifr_buffer.buffer = description;
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ifrdesc.ifr_buffer.length = descrlen;
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if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) {
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if (ifrdesc.ifr_buffer.buffer ==
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description)
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break;
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else
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descrlen = ifrdesc.ifr_buffer.length;
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} else {
|
|
/*
|
|
* Failed to get interface description.
|
|
*/
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free(description);
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|
description = NULL;
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break;
|
|
}
|
|
} else
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|
break;
|
|
}
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|
#else /* __FreeBSD__ */
|
|
/*
|
|
* The only other OS that currently supports
|
|
* SIOCGIFDESCR is OpenBSD, and it has no way
|
|
* to get the description length - it's clamped
|
|
* to a maximum of IFDESCRSIZE.
|
|
*/
|
|
if ((description = malloc(descrlen)) != NULL) {
|
|
ifrdesc.ifr_data = (caddr_t)description;
|
|
if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) {
|
|
/*
|
|
* Failed to get interface description.
|
|
*/
|
|
free(description);
|
|
description = NULL;
|
|
}
|
|
}
|
|
#endif /* __FreeBSD__ */
|
|
close(s);
|
|
if (description != NULL && strlen(description) == 0) {
|
|
free(description);
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|
description = NULL;
|
|
}
|
|
}
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|
#endif /* SIOCGIFDESCR */
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|
|
|
if (add_or_find_if(&curdev, alldevs, name, flags, description,
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|
errbuf) == -1) {
|
|
free(description);
|
|
/*
|
|
* Error - give up.
|
|
*/
|
|
return (-1);
|
|
}
|
|
free(description);
|
|
if (curdev == NULL) {
|
|
/*
|
|
* Device wasn't added because it can't be opened.
|
|
* Not a fatal error.
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* "curdev" is an entry for this interface; add an entry for this
|
|
* address to its list of addresses.
|
|
*
|
|
* Allocate the new entry and fill it in.
|
|
*/
|
|
curaddr = malloc(sizeof(pcap_addr_t));
|
|
if (curaddr == NULL) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"malloc: %s", pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
curaddr->next = NULL;
|
|
if (addr != NULL) {
|
|
curaddr->addr = dup_sockaddr(addr, addr_size);
|
|
if (curaddr->addr == NULL) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"malloc: %s", pcap_strerror(errno));
|
|
free(curaddr);
|
|
return (-1);
|
|
}
|
|
} else
|
|
curaddr->addr = NULL;
|
|
|
|
if (netmask != NULL) {
|
|
curaddr->netmask = dup_sockaddr(netmask, netmask_size);
|
|
if (curaddr->netmask == NULL) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"malloc: %s", pcap_strerror(errno));
|
|
if (curaddr->addr != NULL)
|
|
free(curaddr->addr);
|
|
free(curaddr);
|
|
return (-1);
|
|
}
|
|
} else
|
|
curaddr->netmask = NULL;
|
|
|
|
if (broadaddr != NULL) {
|
|
curaddr->broadaddr = dup_sockaddr(broadaddr, broadaddr_size);
|
|
if (curaddr->broadaddr == NULL) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"malloc: %s", pcap_strerror(errno));
|
|
if (curaddr->netmask != NULL)
|
|
free(curaddr->netmask);
|
|
if (curaddr->addr != NULL)
|
|
free(curaddr->addr);
|
|
free(curaddr);
|
|
return (-1);
|
|
}
|
|
} else
|
|
curaddr->broadaddr = NULL;
|
|
|
|
if (dstaddr != NULL) {
|
|
curaddr->dstaddr = dup_sockaddr(dstaddr, dstaddr_size);
|
|
if (curaddr->dstaddr == NULL) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"malloc: %s", pcap_strerror(errno));
|
|
if (curaddr->broadaddr != NULL)
|
|
free(curaddr->broadaddr);
|
|
if (curaddr->netmask != NULL)
|
|
free(curaddr->netmask);
|
|
if (curaddr->addr != NULL)
|
|
free(curaddr->addr);
|
|
free(curaddr);
|
|
return (-1);
|
|
}
|
|
} else
|
|
curaddr->dstaddr = NULL;
|
|
|
|
/*
|
|
* Find the end of the list of addresses.
|
|
*/
|
|
for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
|
|
nextaddr = prevaddr->next;
|
|
if (nextaddr == NULL) {
|
|
/*
|
|
* This is the end of the list.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (prevaddr == NULL) {
|
|
/*
|
|
* The list was empty; this is the first member.
|
|
*/
|
|
curdev->addresses = curaddr;
|
|
} else {
|
|
/*
|
|
* "prevaddr" is the last member of the list; append
|
|
* this member to it.
|
|
*/
|
|
prevaddr->next = curaddr;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags,
|
|
const char *description, char *errbuf)
|
|
{
|
|
pcap_if_t *curdev;
|
|
|
|
return (add_or_find_if(&curdev, devlist, name, flags, description,
|
|
errbuf));
|
|
}
|
|
|
|
|
|
/*
|
|
* Free a list of interfaces.
|
|
*/
|
|
void
|
|
pcap_freealldevs(pcap_if_t *alldevs)
|
|
{
|
|
pcap_if_t *curdev, *nextdev;
|
|
pcap_addr_t *curaddr, *nextaddr;
|
|
|
|
for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
|
|
nextdev = curdev->next;
|
|
|
|
/*
|
|
* Free all addresses.
|
|
*/
|
|
for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
|
|
nextaddr = curaddr->next;
|
|
if (curaddr->addr)
|
|
free(curaddr->addr);
|
|
if (curaddr->netmask)
|
|
free(curaddr->netmask);
|
|
if (curaddr->broadaddr)
|
|
free(curaddr->broadaddr);
|
|
if (curaddr->dstaddr)
|
|
free(curaddr->dstaddr);
|
|
free(curaddr);
|
|
}
|
|
|
|
/*
|
|
* Free the name string.
|
|
*/
|
|
free(curdev->name);
|
|
|
|
/*
|
|
* Free the description string, if any.
|
|
*/
|
|
if (curdev->description != NULL)
|
|
free(curdev->description);
|
|
|
|
/*
|
|
* Free the interface.
|
|
*/
|
|
free(curdev);
|
|
}
|
|
}
|
|
|
|
#if !defined(WIN32) && !defined(MSDOS)
|
|
|
|
/*
|
|
* Return the name of a network interface attached to the system, or NULL
|
|
* if none can be found. The interface must be configured up; the
|
|
* lowest unit number is preferred; loopback is ignored.
|
|
*/
|
|
char *
|
|
pcap_lookupdev(errbuf)
|
|
register char *errbuf;
|
|
{
|
|
pcap_if_t *alldevs;
|
|
/* for old BSD systems, including bsdi3 */
|
|
#ifndef IF_NAMESIZE
|
|
#define IF_NAMESIZE IFNAMSIZ
|
|
#endif
|
|
static char device[IF_NAMESIZE + 1];
|
|
char *ret;
|
|
|
|
if (pcap_findalldevs(&alldevs, errbuf) == -1)
|
|
return (NULL);
|
|
|
|
if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
|
|
/*
|
|
* There are no devices on the list, or the first device
|
|
* on the list is a loopback device, which means there
|
|
* are no non-loopback devices on the list. This means
|
|
* we can't return any device.
|
|
*
|
|
* XXX - why not return a loopback device? If we can't
|
|
* capture on it, it won't be on the list, and if it's
|
|
* on the list, there aren't any non-loopback devices,
|
|
* so why not just supply it as the default device?
|
|
*/
|
|
(void)strlcpy(errbuf, "no suitable device found",
|
|
PCAP_ERRBUF_SIZE);
|
|
ret = NULL;
|
|
} else {
|
|
/*
|
|
* Return the name of the first device on the list.
|
|
*/
|
|
(void)strlcpy(device, alldevs->name, sizeof(device));
|
|
ret = device;
|
|
}
|
|
|
|
pcap_freealldevs(alldevs);
|
|
return (ret);
|
|
}
|
|
|
|
int
|
|
pcap_lookupnet(device, netp, maskp, errbuf)
|
|
register const char *device;
|
|
register bpf_u_int32 *netp, *maskp;
|
|
register char *errbuf;
|
|
{
|
|
register int fd;
|
|
register struct sockaddr_in *sin4;
|
|
struct ifreq ifr;
|
|
|
|
/*
|
|
* The pseudo-device "any" listens on all interfaces and therefore
|
|
* has the network address and -mask "0.0.0.0" therefore catching
|
|
* all traffic. Using NULL for the interface is the same as "any".
|
|
*/
|
|
if (!device || strcmp(device, "any") == 0
|
|
#ifdef HAVE_DAG_API
|
|
|| strstr(device, "dag") != NULL
|
|
#endif
|
|
#ifdef HAVE_SEPTEL_API
|
|
|| strstr(device, "septel") != NULL
|
|
#endif
|
|
#ifdef PCAP_SUPPORT_BT
|
|
|| strstr(device, "bluetooth") != NULL
|
|
#endif
|
|
#ifdef PCAP_SUPPORT_USB
|
|
|| strstr(device, "usbmon") != NULL
|
|
#endif
|
|
#ifdef HAVE_SNF_API
|
|
|| strstr(device, "snf") != NULL
|
|
#endif
|
|
) {
|
|
*netp = *maskp = 0;
|
|
return 0;
|
|
}
|
|
|
|
fd = socket(AF_INET, SOCK_DGRAM, 0);
|
|
if (fd < 0) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
|
|
pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
#ifdef linux
|
|
/* XXX Work around Linux kernel bug */
|
|
ifr.ifr_addr.sa_family = AF_INET;
|
|
#endif
|
|
(void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
|
|
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
|
|
if (errno == EADDRNOTAVAIL) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"%s: no IPv4 address assigned", device);
|
|
} else {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"SIOCGIFADDR: %s: %s",
|
|
device, pcap_strerror(errno));
|
|
}
|
|
(void)close(fd);
|
|
return (-1);
|
|
}
|
|
sin4 = (struct sockaddr_in *)&ifr.ifr_addr;
|
|
*netp = sin4->sin_addr.s_addr;
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
#ifdef linux
|
|
/* XXX Work around Linux kernel bug */
|
|
ifr.ifr_addr.sa_family = AF_INET;
|
|
#endif
|
|
(void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
|
|
if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"SIOCGIFNETMASK: %s: %s", device, pcap_strerror(errno));
|
|
(void)close(fd);
|
|
return (-1);
|
|
}
|
|
(void)close(fd);
|
|
*maskp = sin4->sin_addr.s_addr;
|
|
if (*maskp == 0) {
|
|
if (IN_CLASSA(*netp))
|
|
*maskp = IN_CLASSA_NET;
|
|
else if (IN_CLASSB(*netp))
|
|
*maskp = IN_CLASSB_NET;
|
|
else if (IN_CLASSC(*netp))
|
|
*maskp = IN_CLASSC_NET;
|
|
else {
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"inet class for 0x%x unknown", *netp);
|
|
return (-1);
|
|
}
|
|
}
|
|
*netp &= *maskp;
|
|
return (0);
|
|
}
|
|
|
|
#elif defined(WIN32)
|
|
|
|
/*
|
|
* Return the name of a network interface attached to the system, or NULL
|
|
* if none can be found. The interface must be configured up; the
|
|
* lowest unit number is preferred; loopback is ignored.
|
|
*/
|
|
char *
|
|
pcap_lookupdev(errbuf)
|
|
register char *errbuf;
|
|
{
|
|
DWORD dwVersion;
|
|
DWORD dwWindowsMajorVersion;
|
|
dwVersion = GetVersion(); /* get the OS version */
|
|
dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
|
|
|
|
if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) {
|
|
/*
|
|
* Windows 95, 98, ME.
|
|
*/
|
|
ULONG NameLength = 8192;
|
|
static char AdaptersName[8192];
|
|
|
|
if (PacketGetAdapterNames(AdaptersName,&NameLength) )
|
|
return (AdaptersName);
|
|
else
|
|
return NULL;
|
|
} else {
|
|
/*
|
|
* Windows NT (NT 4.0, W2K, WXP). Convert the names to UNICODE for backward compatibility
|
|
*/
|
|
ULONG NameLength = 8192;
|
|
static WCHAR AdaptersName[8192];
|
|
char *tAstr;
|
|
WCHAR *tUstr;
|
|
WCHAR *TAdaptersName = (WCHAR*)malloc(8192 * sizeof(WCHAR));
|
|
int NAdapts = 0;
|
|
|
|
if(TAdaptersName == NULL)
|
|
{
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure");
|
|
return NULL;
|
|
}
|
|
|
|
if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) )
|
|
{
|
|
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
|
|
"PacketGetAdapterNames: %s",
|
|
pcap_win32strerror());
|
|
free(TAdaptersName);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
tAstr = (char*)TAdaptersName;
|
|
tUstr = (WCHAR*)AdaptersName;
|
|
|
|
/*
|
|
* Convert and copy the device names
|
|
*/
|
|
while(sscanf(tAstr, "%S", tUstr) > 0)
|
|
{
|
|
tAstr += strlen(tAstr) + 1;
|
|
tUstr += wcslen(tUstr) + 1;
|
|
NAdapts ++;
|
|
}
|
|
|
|
tAstr++;
|
|
*tUstr = 0;
|
|
tUstr++;
|
|
|
|
/*
|
|
* Copy the descriptions
|
|
*/
|
|
while(NAdapts--)
|
|
{
|
|
char* tmp = (char*)tUstr;
|
|
strcpy(tmp, tAstr);
|
|
tmp += strlen(tAstr) + 1;
|
|
tUstr = (WCHAR*)tmp;
|
|
tAstr += strlen(tAstr) + 1;
|
|
}
|
|
|
|
free(TAdaptersName);
|
|
return (char *)(AdaptersName);
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
pcap_lookupnet(device, netp, maskp, errbuf)
|
|
register const char *device;
|
|
register bpf_u_int32 *netp, *maskp;
|
|
register char *errbuf;
|
|
{
|
|
/*
|
|
* We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo()
|
|
* in order to skip non IPv4 (i.e. IPv6 addresses)
|
|
*/
|
|
npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
|
|
LONG if_addr_size = 1;
|
|
struct sockaddr_in *t_addr;
|
|
unsigned int i;
|
|
|
|
if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) {
|
|
*netp = *maskp = 0;
|
|
return (0);
|
|
}
|
|
|
|
for(i=0; i<MAX_NETWORK_ADDRESSES; i++)
|
|
{
|
|
if(if_addrs[i].IPAddress.ss_family == AF_INET)
|
|
{
|
|
t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress);
|
|
*netp = t_addr->sin_addr.S_un.S_addr;
|
|
t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask);
|
|
*maskp = t_addr->sin_addr.S_un.S_addr;
|
|
|
|
*netp &= *maskp;
|
|
return (0);
|
|
}
|
|
|
|
}
|
|
|
|
*netp = *maskp = 0;
|
|
return (0);
|
|
}
|
|
|
|
#endif /* !WIN32 && !MSDOS */
|