Virgin import of libpcap 0.3

1 files changed, 239 insertions, 0 deletions

diff --git a/contrib/libpcap/pcap-linux.c b/contrib/libpcap/pcap-linux.c
new file mode 100644
index 0000000..fe56d05
--- /dev/null
+++ b/contrib/libpcap/pcap-linux.c
@@ -0,0 +1,239 @@
+/*
+ * Copyright (c) 1996
+ *	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: pcap-linux.c,v 1.4 96/12/10 23:15:00 leres Exp $ (LBL)";
+#endif
+
+#include <sys/param.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+
+#include <net/if.h>
+
+#include <netinet/in.h>
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static struct ifreq saved_ifr;
+
+#include "pcap-int.h"
+
+#include "gnuc.h"
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+void linux_restore_ifr(void);
+
+int
+pcap_stats(pcap_t *p, struct pcap_stat *ps)
+{
+
+	*ps = p->md.stat;
+	return (0);
+}
+
+int
+pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+	register int cc;
+	register int bufsize;
+	register int caplen;
+	register u_char *bp;
+	struct sockaddr from;
+	int fromlen;
+
+	bp = (char *)p->buffer;
+	bufsize = p->bufsize;
+	if (p->md.pad > 0) {
+		bp += p->md.pad;
+		bufsize -= p->md.pad;
+		memset(p->buffer, 0, p->md.pad);
+	}
+
+again:
+	do {
+		fromlen = sizeof(from);
+		cc = recvfrom(p->fd, bp, bufsize, 0, &from, &fromlen);
+		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);
+		}
+	} while (strcmp(p->md.device, from.sa_data));
+
+	/* If we need have leading zero bytes, adjust count */
+	cc += p->md.pad;
+	bp = p->buffer;
+
+	/* If we need to step over leading junk, adjust count and pointer */
+	cc -= p->md.skip;
+	bp += p->md.skip;
+
+	/* Captured length can't exceed our read buffer size */
+	caplen = cc;
+	if (caplen > bufsize)
+		caplen = bufsize;
+
+	/* Captured length can't exceed the snapshot length */
+	if (caplen > p->snapshot)
+		caplen = p->snapshot;
+
+	if (p->fcode.bf_insns == NULL ||
+	    bpf_filter(p->fcode.bf_insns, bp, cc, caplen)) {
+		struct pcap_pkthdr h;
+
+		++p->md.stat.ps_recv;
+		/* Get timestamp */
+		if (ioctl(p->fd, SIOCGSTAMP, &h.ts) < 0) {
+			sprintf(p->errbuf, "SIOCGSTAMP: %s",
+			    pcap_strerror(errno));
+			return (-1);
+		}
+		h.len = cc;
+		h.caplen = caplen;
+		(*callback)(user, &h, bp);
+		return (1);
+	}
+	return (0);
+}
+
+pcap_t *
+pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
+{
+	register int fd, broadcast;
+	register pcap_t *p;
+	struct ifreq ifr;
+
+	p = (pcap_t *)malloc(sizeof(*p));
+	if (p == NULL) {
+		sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
+		return (NULL);
+	}
+	memset((char *)p, 0, sizeof(*p));
+	fd = -1;
+
+	/* XXX hack - map device name to link layer type */
+	broadcast = 0;
+	if (strncmp("eth", device, 3) == 0) {
+		p->linktype = DLT_EN10MB;
+		++broadcast;
+	} else if (strncmp("sl", device, 2) == 0) {
+		p->linktype = DLT_SLIP;
+		p->md.pad = 16;
+	} else if (strncmp("ppp", device, 3) == 0) {
+		p->linktype = DLT_PPP;
+		p->md.pad = 4;
+	} else if (strncmp("lo", device, 2) == 0) {
+		p->linktype = DLT_NULL;
+		p->md.pad = 2;
+		p->md.skip = 12;
+	} else {
+		sprintf(ebuf, "linux: unknown physical layer type");
+		goto bad;
+	}
+
+	/* Linux is full of magic numbers */
+	fd = socket(PF_INET, SOCK_PACKET, htons(0x0003));
+	if (fd < 0) {
+		sprintf(ebuf, "linux socket: %s", pcap_strerror(errno));
+		goto bad;
+	}
+	p->fd = fd;
+
+
+	p->bufsize = 4096;				/* XXX */
+	p->buffer = (u_char *)malloc(p->bufsize);
+	if (p->buffer == NULL) {
+		sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
+		goto bad;
+	}
+
+	/* XXX */
+	if (promisc && broadcast) {
+		memset(&ifr, 0, sizeof(ifr));
+		strcpy(ifr.ifr_name, device);
+		if (ioctl(p->fd, SIOCGIFFLAGS, &ifr) < 0 ) {
+			sprintf(ebuf, "SIOCGIFFLAGS: %s", pcap_strerror(errno));
+			goto bad;
+		}
+		saved_ifr = ifr;
+		ifr.ifr_flags |= IFF_PROMISC;
+		if (ioctl(p->fd, SIOCSIFFLAGS, &ifr) < 0 ) {
+			sprintf(ebuf, "SIOCSIFFLAGS: %s", pcap_strerror(errno));
+			goto bad;
+		}
+		ifr.ifr_flags &= ~IFF_PROMISC;
+		atexit(linux_restore_ifr);
+	}
+
+	p->md.device = strdup(device);
+	if (p->md.device == NULL) {
+		sprintf(ebuf, "malloc: %s", pcap_strerror(errno));
+		goto bad;
+	}
+	p->snapshot = snaplen;
+
+	return (p);
+bad:
+	if (fd >= 0)
+		(void)close(fd);
+	if (p->buffer != NULL)
+		free(p->buffer);
+	if (p->md.device != NULL)
+		free(p->md.device);
+	free(p);
+	return (NULL);
+}
+
+int
+pcap_setfilter(pcap_t *p, struct bpf_program *fp)
+{
+
+	p->fcode = *fp;
+	return (0);
+}
+
+void
+linux_restore_ifr(void)
+{
+	register int fd;
+
+	fd = socket(PF_INET, SOCK_PACKET, htons(0x0003));
+	if (fd < 0)
+		fprintf(stderr, "linux socket: %s", pcap_strerror(errno));
+	else if (ioctl(fd, SIOCSIFFLAGS, &saved_ifr) < 0)
+		fprintf(stderr, "linux SIOCSIFFLAGS: %s", pcap_strerror(errno));
+}