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332 lines
7.3 KiB
C
332 lines
7.3 KiB
C
/*
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* Copyright (c) 1996, 1997
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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: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: pcap-linux.c,v 1.15 97/10/02 22:39:37 leres Exp $ (LBL)";
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#endif
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <net/if.h>
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#ifdef HAVE_NET_IF_ARP_H
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#include <net/if_arp.h>
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#else
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#include <linux/if_arp.h>
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#endif
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#include <linux/if_ether.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <malloc.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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static struct ifreq saved_ifr;
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#include "pcap-int.h"
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#include "gnuc.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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void linux_restore_ifr(void);
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int
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pcap_stats(pcap_t *p, struct pcap_stat *ps)
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{
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*ps = p->md.stat;
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return (0);
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}
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int
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pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
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{
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register int cc;
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register int bufsize;
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register int caplen;
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register u_char *bp;
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struct sockaddr from;
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int fromlen;
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bp = p->buffer + p->offset;
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bufsize = p->bufsize;
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if (p->md.pad > 0) {
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memset(bp, 0, p->md.pad);
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bp += p->md.pad;
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bufsize -= p->md.pad;
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}
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again:
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do {
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fromlen = sizeof(from);
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cc = recvfrom(p->fd, bp, bufsize, 0, &from, &fromlen);
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if (cc < 0) {
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/* Don't choke when we get ptraced */
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switch (errno) {
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case EINTR:
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goto again;
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case EWOULDBLOCK:
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return (0); /* XXX */
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}
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sprintf(p->errbuf, "read: %s", pcap_strerror(errno));
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return (-1);
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}
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} while (strcmp(p->md.device, from.sa_data));
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/* If we need have leading zero bytes, adjust count */
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cc += p->md.pad;
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bp = p->buffer + p->offset;
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/* If we need to step over leading junk, adjust count and pointer */
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cc -= p->md.skip;
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bp += p->md.skip;
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/* Captured length can't exceed our read buffer size */
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caplen = cc;
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if (caplen > bufsize)
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caplen = bufsize;
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/* Captured length can't exceed the snapshot length */
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if (caplen > p->snapshot)
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caplen = p->snapshot;
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if (p->fcode.bf_insns == NULL ||
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bpf_filter(p->fcode.bf_insns, bp, cc, caplen)) {
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struct pcap_pkthdr h;
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++p->md.stat.ps_recv;
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/* Get timestamp */
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if (ioctl(p->fd, SIOCGSTAMP, &h.ts) < 0) {
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sprintf(p->errbuf, "SIOCGSTAMP: %s",
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pcap_strerror(errno));
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return (-1);
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}
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h.len = cc;
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h.caplen = caplen;
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(*callback)(user, &h, bp);
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return (1);
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}
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return (0);
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}
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pcap_t *
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pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
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{
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register int fd, broadcast;
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register pcap_t *p;
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struct ifreq ifr;
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struct sockaddr sa;
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p = (pcap_t *)malloc(sizeof(*p));
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if (p == NULL) {
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sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
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return (NULL);
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}
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memset(p, 0, sizeof(*p));
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fd = -1;
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fd = socket(PF_INET, SOCK_PACKET, htons(ETH_P_ALL));
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if (fd < 0) {
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sprintf(ebuf, "socket: %s", pcap_strerror(errno));
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goto bad;
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}
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p->fd = fd;
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/* Bind to the interface name */
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memset(&sa, 0, sizeof(sa));
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sa.sa_family = AF_INET;
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(void)strncpy(sa.sa_data, device, sizeof(sa.sa_data));
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if (bind(p->fd, &sa, sizeof(sa))) {
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sprintf(ebuf, "bind: %s: %s", device, pcap_strerror(errno));
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goto bad;
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}
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
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if (ioctl(p->fd, SIOCGIFHWADDR, &ifr) < 0 ) {
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sprintf(ebuf, "SIOCGIFHWADDR: %s", pcap_strerror(errno));
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goto bad;
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}
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broadcast = 0;
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switch (ifr.ifr_hwaddr.sa_family) {
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case ARPHRD_ETHER:
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case ARPHRD_METRICOM:
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p->linktype = DLT_EN10MB;
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p->offset = 2;
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++broadcast;
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break;
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case ARPHRD_EETHER:
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p->linktype = DLT_EN3MB;
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++broadcast;
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break;
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case ARPHRD_AX25:
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p->linktype = DLT_AX25;
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++broadcast;
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break;
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case ARPHRD_PRONET:
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p->linktype = DLT_PRONET;
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break;
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case ARPHRD_CHAOS:
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p->linktype = DLT_CHAOS;
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break;
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case ARPHRD_IEEE802:
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p->linktype = DLT_IEEE802;
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++broadcast;
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break;
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case ARPHRD_ARCNET:
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p->linktype = DLT_ARCNET;
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++broadcast;
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break;
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case ARPHRD_SLIP:
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case ARPHRD_CSLIP:
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case ARPHRD_SLIP6:
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case ARPHRD_CSLIP6:
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case ARPHRD_PPP:
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p->linktype = DLT_RAW;
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break;
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case ARPHRD_LOOPBACK:
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p->linktype = DLT_NULL;
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p->md.pad = 2;
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p->md.skip = 12;
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break;
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#ifdef ARPHRD_FDDI
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/* Not all versions of the kernel has this define */
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case ARPHRD_FDDI:
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p->linktype = DLT_FDDI;
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++broadcast;
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break;
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#endif
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#ifdef notdef
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case ARPHRD_LOCALTLK:
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case ARPHRD_NETROM:
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case ARPHRD_APPLETLK:
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case ARPHRD_DLCI:
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case ARPHRD_RSRVD:
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case ARPHRD_ADAPT:
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case ARPHRD_TUNNEL:
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case ARPHRD_TUNNEL6:
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case ARPHRD_FRAD:
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case ARPHRD_SKIP:
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/* XXX currently do not know what to do with these... */
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abort();
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#endif
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default:
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sprintf(ebuf, "unknown physical layer type 0x%x",
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ifr.ifr_hwaddr.sa_family);
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goto bad;
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}
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/* Base the buffer size on the interface MTU */
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
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if (ioctl(p->fd, SIOCGIFMTU, &ifr) < 0 ) {
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sprintf(ebuf, "SIOCGIFMTU: %s", pcap_strerror(errno));
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goto bad;
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}
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/* Leave room for link header (which is never large under linux...) */
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p->bufsize = ifr.ifr_mtu + 64;
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p->buffer = (u_char *)malloc(p->bufsize + p->offset);
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if (p->buffer == NULL) {
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sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
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goto bad;
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}
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/* XXX */
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if (promisc && broadcast) {
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memset(&ifr, 0, sizeof(ifr));
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strcpy(ifr.ifr_name, device);
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if (ioctl(p->fd, SIOCGIFFLAGS, &ifr) < 0 ) {
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sprintf(ebuf, "SIOCGIFFLAGS: %s", pcap_strerror(errno));
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goto bad;
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}
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saved_ifr = ifr;
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ifr.ifr_flags |= IFF_PROMISC;
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if (ioctl(p->fd, SIOCSIFFLAGS, &ifr) < 0 ) {
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sprintf(ebuf, "SIOCSIFFLAGS: %s", pcap_strerror(errno));
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goto bad;
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}
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ifr.ifr_flags &= ~IFF_PROMISC;
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atexit(linux_restore_ifr);
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}
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p->md.device = strdup(device);
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if (p->md.device == NULL) {
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sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
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goto bad;
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}
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p->snapshot = snaplen;
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return (p);
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bad:
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if (fd >= 0)
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(void)close(fd);
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if (p->buffer != NULL)
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free(p->buffer);
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if (p->md.device != NULL)
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free(p->md.device);
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free(p);
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return (NULL);
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}
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int
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pcap_setfilter(pcap_t *p, struct bpf_program *fp)
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{
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p->fcode = *fp;
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return (0);
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}
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void
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linux_restore_ifr(void)
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{
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register int fd;
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fd = socket(PF_INET, SOCK_PACKET, htons(0x0003));
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if (fd < 0)
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fprintf(stderr, "linux socket: %s", pcap_strerror(errno));
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else if (ioctl(fd, SIOCSIFFLAGS, &saved_ifr) < 0)
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fprintf(stderr, "linux SIOCSIFFLAGS: %s", pcap_strerror(errno));
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}
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