Virgin import of unmodified tcpdump v3.2.1 distribution from LBL.

Obtained from: ftp://ftp.ee.lbl.gov/tcpdump.tar.Z on 19-Aug-1996.

1 files changed, 508 insertions, 0 deletions

diff --git a/contrib/tcpdump/print-ip.c b/contrib/tcpdump/print-ip.c
new file mode 100644
index 0000000..935bb7c
--- /dev/null
+++ b/contrib/tcpdump/print-ip.c
@@ -0,0 +1,508 @@
+/*
+ * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 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 char rcsid[] =
+    "@(#) $Header: print-ip.c,v 1.56 96/07/23 14:17:24 leres Exp $ (LBL)";
+#endif
+
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcpip.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "addrtoname.h"
+#include "interface.h"
+#include "extract.h"			/* must come after interface.h */
+
+/* Compatibility */
+#ifndef	IPPROTO_ND
+#define	IPPROTO_ND	77
+#endif
+
+#ifndef IN_CLASSD
+#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
+#endif
+
+/* (following from ipmulti/mrouted/prune.h) */
+
+/*
+ * The packet format for a traceroute request.
+ */
+struct tr_query {
+	u_int  tr_src;			/* traceroute source */
+	u_int  tr_dst;			/* traceroute destination */
+	u_int  tr_raddr;		/* traceroute response address */
+#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
+	struct {
+		u_int	qid : 24;	/* traceroute query id */
+		u_int	ttl : 8;	/* traceroute response ttl */
+	} q;
+#else
+	struct {
+		u_int   ttl : 8;	/* traceroute response ttl */
+		u_int   qid : 24;	/* traceroute query id */
+	} q;
+#endif /* BYTE_ORDER */
+};
+
+#define tr_rttl q.ttl
+#define tr_qid  q.qid
+
+/*
+ * Traceroute response format.  A traceroute response has a tr_query at the
+ * beginning, followed by one tr_resp for each hop taken.
+ */
+struct tr_resp {
+	u_int tr_qarr;			/* query arrival time */
+	u_int tr_inaddr;		/* incoming interface address */
+	u_int tr_outaddr;		/* outgoing interface address */
+	u_int tr_rmtaddr;		/* parent address in source tree */
+	u_int tr_vifin;			/* input packet count on interface */
+	u_int tr_vifout;		/* output packet count on interface */
+	u_int tr_pktcnt;		/* total incoming packets for src-grp */
+	u_char  tr_rproto;		/* routing proto deployed on router */
+	u_char  tr_fttl;		/* ttl required to forward on outvif */
+	u_char  tr_smask;		/* subnet mask for src addr */
+	u_char  tr_rflags;		/* forwarding error codes */
+};
+
+/* defs within mtrace */
+#define TR_QUERY 1
+#define TR_RESP	2
+
+/* fields for tr_rflags (forwarding error codes) */
+#define TR_NO_ERR	0
+#define TR_WRONG_IF	1
+#define TR_PRUNED	2
+#define TR_OPRUNED	3
+#define TR_SCOPED	4
+#define TR_NO_RTE	5
+#define TR_NO_FWD	7
+#define TR_NO_SPACE	0x81
+#define TR_OLD_ROUTER	0x82
+
+/* fields for tr_rproto (routing protocol) */
+#define TR_PROTO_DVMRP	1
+#define TR_PROTO_MOSPF	2
+#define TR_PROTO_PIM	3
+#define TR_PROTO_CBT	4
+
+static void print_mtrace(register const u_char *bp, register u_int len)
+{
+	register struct tr_query* tr = (struct tr_query*)(bp + 8);
+
+	printf("mtrace %d: %s to %s reply-to %s", tr->tr_qid,
+		ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
+		ipaddr_string(&tr->tr_raddr));
+	if (IN_CLASSD(ntohl(tr->tr_raddr)))
+		printf(" with-ttl %d", tr->tr_rttl);
+}
+
+static void print_mresp(register const u_char *bp, register u_int len)
+{
+	register struct tr_query* tr = (struct tr_query*)(bp + 8);
+
+	printf("mresp %d: %s to %s reply-to %s", tr->tr_qid,
+		ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
+		ipaddr_string(&tr->tr_raddr));
+	if (IN_CLASSD(ntohl(tr->tr_raddr)))
+		printf(" with-ttl %d", tr->tr_rttl);
+}
+
+static void
+igmp_print(register const u_char *bp, register u_int len,
+	   register const u_char *bp2)
+{
+	register const struct ip *ip;
+
+	ip = (const struct ip *)bp2;
+        (void)printf("%s > %s: ",
+		ipaddr_string(&ip->ip_src),
+		ipaddr_string(&ip->ip_dst));
+
+	TCHECK2(bp[0], 8);
+	switch (bp[0]) {
+	case 0x11:
+		(void)printf("igmp query");
+		if (*(int *)&bp[4])
+			(void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
+		if (len != 8)
+			(void)printf(" [len %d]", len);
+		break;
+	case 0x12:
+		(void)printf("igmp report %s", ipaddr_string(&bp[4]));
+		if (len != 8)
+			(void)printf(" [len %d]", len);
+		break;
+	case 0x16:
+		(void)printf("igmp nreport %s", ipaddr_string(&bp[4]));
+		break;
+	case 0x17:
+		(void)printf("igmp leave %s", ipaddr_string(&bp[4]));
+		break;
+	case 0x13:
+		(void)printf("igmp dvmrp");
+		if (len < 8)
+			(void)printf(" [len %d]", len);
+		else
+			dvmrp_print(bp, len);
+		break;
+	case 0x14:
+		(void)printf("igmp pim");
+		pim_print(bp, len);
+  		break;
+	case 0x1e:
+		print_mresp(bp, len);
+		break;
+	case 0x1f:
+		print_mtrace(bp, len);
+		break;
+	default:
+		(void)printf("igmp-%d", bp[0] & 0xf);
+		break;
+	}
+	if ((bp[0] >> 4) != 1)
+		(void)printf(" [v%d]", bp[0] >> 4);
+
+	TCHECK2(bp[0], len);
+	if (vflag) {
+		/* Check the IGMP checksum */
+		u_int32_t sum = 0;
+		int count;
+		const u_short *sp = (u_short*)bp;
+		
+		for (count = len / 2; --count >= 0; )
+			sum += *sp++;
+		if (len & 1)
+			sum += ntohs(*(unsigned char*) sp << 8);
+		while (sum >> 16)
+			sum = (sum & 0xffff) + (sum >> 16);
+		sum = 0xffff & ~sum;
+		if (sum != 0)
+			printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
+	}
+	return;
+trunc:
+	fputs("[|igmp]", stdout);
+}
+
+/*
+ * print the recorded route in an IP RR, LSRR or SSRR option.
+ */
+static void
+ip_printroute(const char *type, register const u_char *cp, u_int length)
+{
+	register u_int ptr = cp[2] - 1;
+	register u_int len;
+
+	printf(" %s{", type);
+	if ((length + 1) & 3)
+		printf(" [bad length %d]", length);
+	if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
+		printf(" [bad ptr %d]", cp[2]);
+
+	type = "";
+	for (len = 3; len < length; len += 4) {
+		if (ptr == len)
+			type = "#";
+		printf("%s%s", type, ipaddr_string(&cp[len]));
+		type = " ";
+	}
+	printf("%s}", ptr == len? "#" : "");
+}
+
+/*
+ * print IP options.
+ */
+static void
+ip_optprint(register const u_char *cp, u_int length)
+{
+	register u_int len;
+
+	for (; length > 0; cp += len, length -= len) {
+		int tt = *cp;
+
+		len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
+		if (len <= 0) {
+			printf("[|ip op len %d]", len);
+			return;
+		}
+		if (&cp[1] >= snapend || cp + len > snapend) {
+			printf("[|ip]");
+			return;
+		}
+		switch (tt) {
+
+		case IPOPT_EOL:
+			printf(" EOL");
+			if (length > 1)
+				printf("-%d", length - 1);
+			return;
+
+		case IPOPT_NOP:
+			printf(" NOP");
+			break;
+
+		case IPOPT_TS:
+			printf(" TS{%d}", len);
+			break;
+
+		case IPOPT_SECURITY:
+			printf(" SECURITY{%d}", len);
+			break;
+
+		case IPOPT_RR:
+			printf(" RR{%d}=", len);
+			ip_printroute("RR", cp, len);
+			break;
+
+		case IPOPT_SSRR:
+			ip_printroute("SSRR", cp, len);
+			break;
+
+		case IPOPT_LSRR:
+			ip_printroute("LSRR", cp, len);
+			break;
+
+		default:
+			printf(" IPOPT-%d{%d}", cp[0], len);
+			break;
+		}
+	}
+}
+
+/*
+ * compute an IP header checksum.
+ * don't modifiy the packet.
+ */
+static int
+in_cksum(const struct ip *ip)
+{
+	register const u_short *sp = (u_short *)ip;
+	register u_int32_t sum = 0;
+	register int count;
+
+	/*
+	 * No need for endian conversions.
+	 */
+	for (count = ip->ip_hl * 2; --count >= 0; )
+		sum += *sp++;
+	while (sum > 0xffff)
+		sum = (sum & 0xffff) + (sum >> 16);
+	sum = ~sum & 0xffff;
+
+	return (sum);
+}
+
+/*
+ * print an IP datagram.
+ */
+void
+ip_print(register const u_char *bp, register u_int length)
+{
+	register const struct ip *ip;
+	register u_int hlen, len, off;
+	register const u_char *cp;
+
+	ip = (const struct ip *)bp;
+#ifdef LBL_ALIGN
+	/*
+	 * If the IP header is not aligned, copy into abuf.
+	 * This will never happen with BPF.  It does happen raw packet
+	 * dumps from -r.
+	 */
+	if ((long)ip & 3) {
+		static u_char *abuf = NULL;
+		static int didwarn = 0;
+
+		if (abuf == NULL) {
+			abuf = (u_char *)malloc(snaplen);
+			if (abuf == NULL)
+				error("ip_print: malloc");
+		}
+		memcpy((char *)abuf, (char *)ip, min(length, snaplen));
+		snapend += abuf - (u_char *)ip;
+		packetp = abuf;
+		ip = (struct ip *)abuf;
+		/* We really want libpcap to give us aligned packets */
+		if (!didwarn) {
+			warning("compensating for unaligned libpcap packets");
+			++didwarn;
+		}
+	}
+#endif
+	if ((u_char *)(ip + 1) > snapend) {
+		printf("[|ip]");
+		return;
+	}
+	if (length < sizeof (struct ip)) {
+		(void)printf("truncated-ip %d", length);
+		return;
+	}
+	hlen = ip->ip_hl * 4;
+
+	len = ntohs(ip->ip_len);
+	if (length < len)
+		(void)printf("truncated-ip - %d bytes missing!",
+			len - length);
+	len -= hlen;
+
+	/*
+	 * If this is fragment zero, hand it to the next higher
+	 * level protocol.
+	 */
+	off = ntohs(ip->ip_off);
+	if ((off & 0x1fff) == 0) {
+		cp = (const u_char *)ip + hlen;
+		switch (ip->ip_p) {
+
+		case IPPROTO_TCP:
+			tcp_print(cp, len, (const u_char *)ip);
+			break;
+
+		case IPPROTO_UDP:
+			udp_print(cp, len, (const u_char *)ip);
+			break;
+
+		case IPPROTO_ICMP:
+			icmp_print(cp, (const u_char *)ip);
+			break;
+
+#ifndef IPPROTO_IGRP
+#define IPPROTO_IGRP 9
+#endif
+		case IPPROTO_IGRP:
+			igrp_print(cp, len, (const u_char *)ip);
+			break;
+
+		case IPPROTO_ND:
+			(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
+				ipaddr_string(&ip->ip_dst));
+			(void)printf(" nd %d", len);
+			break;
+
+		case IPPROTO_EGP:
+			egp_print(cp, len, (const u_char *)ip);
+			break;
+
+#ifndef IPPROTO_OSPF
+#define IPPROTO_OSPF 89
+#endif
+		case IPPROTO_OSPF:
+			ospf_print(cp, len, (const u_char *)ip);
+			break;
+
+#ifndef IPPROTO_IGMP
+#define IPPROTO_IGMP 2
+#endif
+		case IPPROTO_IGMP:
+			igmp_print(cp, len, (const u_char *)ip);
+			break;
+
+#ifndef IPPROTO_ENCAP
+#define IPPROTO_ENCAP 4
+#endif
+		case IPPROTO_ENCAP:
+			/* ip-in-ip encapsulation */
+			if (vflag)
+				(void)printf("%s > %s: ",
+					     ipaddr_string(&ip->ip_src),
+					     ipaddr_string(&ip->ip_dst));
+			ip_print(cp, len);
+			if (! vflag) {
+				printf(" (encap)");
+				return;
+			}
+			break;
+
+		default:
+			(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
+				ipaddr_string(&ip->ip_dst));
+			(void)printf(" ip-proto-%d %d", ip->ip_p, len);
+			break;
+		}
+	}
+	/*
+	 * for fragmented datagrams, print id:size@offset.  On all
+	 * but the last stick a "+".  For unfragmented datagrams, note
+	 * the don't fragment flag.
+	 */
+	if (off & 0x3fff) {
+		/*
+		 * if this isn't the first frag, we're missing the
+		 * next level protocol header.  print the ip addr.
+		 */
+		if (off & 0x1fff)
+			(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
+				      ipaddr_string(&ip->ip_dst));
+		(void)printf(" (frag %d:%d@%d%s)", ntohs(ip->ip_id), len,
+			(off & 0x1fff) * 8,
+			(off & IP_MF)? "+" : "");
+	} else if (off & IP_DF)
+		(void)printf(" (DF)");
+
+	if (ip->ip_tos)
+		(void)printf(" [tos 0x%x]", (int)ip->ip_tos);
+	if (ip->ip_ttl <= 1)
+		(void)printf(" [ttl %d]", (int)ip->ip_ttl);
+
+	if (vflag) {
+		int sum;
+		char *sep = "";
+
+		printf(" (");
+		if (ip->ip_ttl > 1) {
+			(void)printf("%sttl %d", sep, (int)ip->ip_ttl);
+			sep = ", ";
+		}
+		if ((off & 0x3fff) == 0) {
+			(void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
+			sep = ", ";
+		}
+		if ((u_char *)ip + hlen <= snapend) {
+			sum = in_cksum(ip);
+			if (sum != 0) {
+				(void)printf("%sbad cksum %x!", sep,
+					     ntohs(ip->ip_sum));
+				sep = ", ";
+			}
+		}
+		if ((hlen -= sizeof(struct ip)) > 0) {
+			(void)printf("%soptlen=%d", sep, hlen);
+			ip_optprint((u_char *)(ip + 1), hlen);
+		}
+		printf(")");
+	}
+}