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authormcr <mcr>1999-10-07 23:46:40 +0000
committermcr <mcr>1999-10-07 23:46:40 +0000
commitb11ddf8a9b0d30bf759abf01afcf2894e79857b1 (patch)
tree5e15f6638915dde6ec02702ea6a5a0974894d4d4 /pcap-snoop.c
Initial revision
Diffstat (limited to 'pcap-snoop.c')
-rw-r--r--pcap-snoop.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/pcap-snoop.c b/pcap-snoop.c
new file mode 100644
index 0000000..1ea7fab
--- /dev/null
+++ b/pcap-snoop.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright (c) 1993, 1994, 1995, 1996, 1997
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+#ifndef lint
+static const char rcsid[] =
+ "@(#) $Header: /tcpdump/master/libpcap/pcap-snoop.c,v 1.20 1999-10-07 23:46:40 mcr Exp $ (LBL)";
+#endif
+
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+
+#include <net/raw.h>
+#include <net/if.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/if_ether.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcpip.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "pcap-int.h"
+
+#include "gnuc.h"
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+int
+pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+ int cc;
+ register struct snoopheader *sh;
+ register int datalen;
+ register int caplen;
+ register u_char *cp;
+
+again:
+ cc = read(p->fd, (char *)p->buffer, p->bufsize);
+ if (cc < 0) {
+ /* Don't choke when we get ptraced */
+ switch (errno) {
+
+ case EINTR:
+ goto again;
+
+ case EWOULDBLOCK:
+ return (0); /* XXX */
+ }
+ sprintf(p->errbuf, "read: %s", pcap_strerror(errno));
+ return (-1);
+ }
+ sh = (struct snoopheader *)p->buffer;
+ datalen = sh->snoop_packetlen;
+ caplen = (datalen < p->snapshot) ? datalen : p->snapshot;
+ cp = (u_char *)(sh + 1) + p->offset; /* XXX */
+
+ if (p->fcode.bf_insns == NULL ||
+ bpf_filter(p->fcode.bf_insns, cp, datalen, caplen)) {
+ struct pcap_pkthdr h;
+ ++p->md.stat.ps_recv;
+ h.ts = sh->snoop_timestamp;
+ h.len = datalen;
+ h.caplen = caplen;
+ (*callback)(user, &h, cp);
+ return (1);
+ }
+ return (0);
+}
+
+int
+pcap_stats(pcap_t *p, struct pcap_stat *ps)
+{
+ register struct rawstats *rs;
+ struct rawstats rawstats;
+
+ rs = &rawstats;
+ bzero((char *)rs, sizeof(*rs));
+ if (ioctl(p->fd, SIOCRAWSTATS, (char *)rs) < 0) {
+ sprintf(p->errbuf, "SIOCRAWSTATS: %s", pcap_strerror(errno));
+ return (-1);
+ }
+
+ p->md.stat.ps_drop =
+ rs->rs_snoop.ss_ifdrops + rs->rs_snoop.ss_sbdrops +
+ rs->rs_drain.ds_ifdrops + rs->rs_drain.ds_sbdrops;
+
+ *ps = p->md.stat;
+ return (0);
+}
+
+/* XXX can't disable promiscuous */
+pcap_t *
+pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
+{
+ int fd;
+ struct sockaddr_raw sr;
+ struct snoopfilter sf;
+ u_int v;
+ pcap_t *p;
+
+ p = (pcap_t *)malloc(sizeof(*p));
+ if (p == NULL) {
+ sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
+ return (NULL);
+ }
+ bzero((char *)p, sizeof(*p));
+ fd = socket(PF_RAW, SOCK_RAW, RAWPROTO_SNOOP);
+ if (fd < 0) {
+ sprintf(ebuf, "snoop socket: %s", pcap_strerror(errno));
+ goto bad;
+ }
+ p->fd = fd;
+ bzero((char *)&sr, sizeof(sr));
+ sr.sr_family = AF_RAW;
+ (void)strncpy(sr.sr_ifname, device, sizeof(sr.sr_ifname));
+ if (bind(fd, (struct sockaddr *)&sr, sizeof(sr))) {
+ sprintf(ebuf, "snoop bind: %s", pcap_strerror(errno));
+ goto bad;
+ }
+ bzero((char *)&sf, sizeof(sf));
+ if (ioctl(fd, SIOCADDSNOOP, &sf) < 0) {
+ sprintf(ebuf, "SIOCADDSNOOP: %s", pcap_strerror(errno));
+ goto bad;
+ }
+ v = 64 * 1024;
+ (void)setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&v, sizeof(v));
+ if (ioctl(fd, SIOCSNOOPLEN, &snaplen) < 0) {
+ sprintf(ebuf, "SIOCSNOOPLEN: %s", pcap_strerror(errno));
+ goto bad;
+ }
+ p->snapshot = snaplen;
+ v = 1;
+ if (ioctl(fd, SIOCSNOOPING, &v) < 0) {
+ sprintf(ebuf, "SIOCSNOOPING: %s", pcap_strerror(errno));
+ goto bad;
+ }
+ /*
+ * XXX hack - map device name to link layer type
+ */
+ if (strncmp("et", device, 2) == 0 || /* Challenge 10 Mbit */
+ strncmp("ec", device, 2) == 0 || /* Indigo/Indy 10 Mbit,
+ O2 10/100 */
+ strncmp("ef", device, 2) == 0 || /* O200/2000 10/100 Mbit */
+ strncmp("gfe", device, 3) == 0 || /* GIO 100 Mbit */
+ strncmp("fxp", device, 3) == 0 || /* Challenge VME Enet */
+ strncmp("ep", device, 2) == 0 || /* Challenge 8x10 Mbit EPLEX */
+ strncmp("vfe", device, 3) == 0 || /* Challenge VME 100Mbit */
+ strncmp("fa", device, 2) == 0 ||
+ strncmp("qaa", device, 3) == 0) {
+ p->linktype = DLT_EN10MB;
+ p->offset = RAW_HDRPAD(sizeof(struct ether_header));
+ } else if (strncmp("ipg", device, 3) == 0 ||
+ strncmp("rns", device, 3) == 0 || /* O2/200/2000 FDDI */
+ strncmp("xpi", device, 3) == 0) {
+ p->linktype = DLT_FDDI;
+ p->offset = 3; /* XXX yeah? */
+ } else if (strncmp("ppp", device, 3) == 0) {
+ p->linktype = DLT_RAW;
+ } else if (strncmp("lo", device, 2) == 0) {
+ p->linktype = DLT_NULL;
+ } else {
+ sprintf(ebuf, "snoop: unknown physical layer type");
+ goto bad;
+ }
+
+ p->bufsize = 4096; /* XXX */
+ p->buffer = (u_char *)malloc(p->bufsize);
+ if (p->buffer == NULL) {
+ sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
+ goto bad;
+ }
+
+ return (p);
+ bad:
+ (void)close(fd);
+ free(p);
+ return (NULL);
+}
+
+int
+pcap_setfilter(pcap_t *p, struct bpf_program *fp)
+{
+
+ p->fcode = *fp;
+ return (0);
+}