1996-08-19 20:36:34 +00:00
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/*
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1998-09-15 19:28:10 +00:00
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* Copyright (c) 1993, 1994, 1995, 1996, 1997
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1996-08-19 20:36:34 +00:00
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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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1997-05-27 00:01:12 +00:00
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static const char rcsid[] =
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1998-09-15 19:28:10 +00:00
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"@(#) $Header: pcap-snoop.c,v 1.20 97/04/08 21:06:17 leres Exp $ (LBL)";
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1996-08-19 20:36:34 +00:00
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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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#include <sys/time.h>
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#include <net/raw.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/if_ether.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcpip.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 <string.h>
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#include <unistd.h>
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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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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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int cc;
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register struct snoopheader *sh;
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register int datalen;
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register int caplen;
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register u_char *cp;
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again:
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cc = read(p->fd, (char *)p->buffer, p->bufsize);
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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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sh = (struct snoopheader *)p->buffer;
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datalen = sh->snoop_packetlen;
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caplen = (datalen < p->snapshot) ? datalen : p->snapshot;
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cp = (u_char *)(sh + 1) + p->offset; /* XXX */
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if (p->fcode.bf_insns == NULL ||
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bpf_filter(p->fcode.bf_insns, cp, datalen, caplen)) {
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struct pcap_pkthdr h;
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++p->md.stat.ps_recv;
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h.ts = sh->snoop_timestamp;
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h.len = datalen;
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h.caplen = caplen;
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(*callback)(user, &h, cp);
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return (1);
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}
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return (0);
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}
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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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register struct rawstats *rs;
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struct rawstats rawstats;
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rs = &rawstats;
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bzero((char *)rs, sizeof(*rs));
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if (ioctl(p->fd, SIOCRAWSTATS, (char *)rs) < 0) {
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sprintf(p->errbuf, "SIOCRAWSTATS: %s", pcap_strerror(errno));
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return (-1);
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}
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p->md.stat.ps_drop =
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rs->rs_snoop.ss_ifdrops + rs->rs_snoop.ss_sbdrops +
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rs->rs_drain.ds_ifdrops + rs->rs_drain.ds_sbdrops;
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*ps = p->md.stat;
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return (0);
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}
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/* XXX can't disable promiscuous */
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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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int fd;
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struct sockaddr_raw sr;
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struct snoopfilter sf;
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u_int v;
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pcap_t *p;
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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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bzero((char *)p, sizeof(*p));
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fd = socket(PF_RAW, SOCK_RAW, RAWPROTO_SNOOP);
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if (fd < 0) {
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sprintf(ebuf, "snoop 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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bzero((char *)&sr, sizeof(sr));
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sr.sr_family = AF_RAW;
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(void)strncpy(sr.sr_ifname, device, sizeof(sr.sr_ifname));
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if (bind(fd, (struct sockaddr *)&sr, sizeof(sr))) {
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sprintf(ebuf, "snoop bind: %s", pcap_strerror(errno));
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goto bad;
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}
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bzero((char *)&sf, sizeof(sf));
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if (ioctl(fd, SIOCADDSNOOP, &sf) < 0) {
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sprintf(ebuf, "SIOCADDSNOOP: %s", pcap_strerror(errno));
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goto bad;
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}
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v = 64 * 1024;
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(void)setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&v, sizeof(v));
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if (ioctl(fd, SIOCSNOOPLEN, &snaplen) < 0) {
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sprintf(ebuf, "SIOCSNOOPLEN: %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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v = 1;
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if (ioctl(fd, SIOCSNOOPING, &v) < 0) {
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sprintf(ebuf, "SIOCSNOOPING: %s", pcap_strerror(errno));
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goto bad;
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}
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/*
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* XXX hack - map device name to link layer type
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*/
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1998-09-15 19:28:10 +00:00
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if (strncmp("et", device, 2) == 0 || /* Challenge 10 Mbit */
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strncmp("ec", device, 2) == 0 || /* Indigo/Indy 10 Mbit,
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O2 10/100 */
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strncmp("ef", device, 2) == 0 || /* O200/2000 10/100 Mbit */
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strncmp("gfe", device, 3) == 0 || /* GIO 100 Mbit */
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strncmp("fxp", device, 3) == 0 || /* Challenge VME Enet */
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strncmp("ep", device, 2) == 0 || /* Challenge 8x10 Mbit EPLEX */
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strncmp("vfe", device, 3) == 0 || /* Challenge VME 100Mbit */
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strncmp("fa", device, 2) == 0 ||
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strncmp("qaa", device, 3) == 0) {
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1996-08-19 20:36:34 +00:00
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p->linktype = DLT_EN10MB;
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p->offset = RAW_HDRPAD(sizeof(struct ether_header));
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} else if (strncmp("ipg", device, 3) == 0 ||
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1998-09-15 19:28:10 +00:00
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strncmp("rns", device, 3) == 0 || /* O2/200/2000 FDDI */
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1996-08-19 20:36:34 +00:00
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strncmp("xpi", device, 3) == 0) {
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p->linktype = DLT_FDDI;
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p->offset = 3; /* XXX yeah? */
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1998-09-15 19:28:10 +00:00
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} else if (strncmp("ppp", device, 3) == 0) {
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p->linktype = DLT_RAW;
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1996-08-19 20:36:34 +00:00
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} else if (strncmp("lo", device, 2) == 0) {
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p->linktype = DLT_NULL;
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} else {
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sprintf(ebuf, "snoop: unknown physical layer type");
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goto bad;
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}
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p->bufsize = 4096; /* XXX */
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p->buffer = (u_char *)malloc(p->bufsize);
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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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return (p);
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bad:
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(void)close(fd);
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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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