X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/63c668cbeb35cfecfb31bd35c55b2df7737d5c07..refs/heads/tcpdump-3.8:/print-ip.c

diff --git a/print-ip.c b/print-ip.c
index 91d73a98..745ab3c3 100644
--- a/print-ip.c
+++ b/print-ip.c
@@ -20,8 +20,8 @@
  */
 
 #ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.123 2003-05-15 15:25:18 hannes Exp $ (LBL)";
+static const char rcsid[] _U_ =
+    "@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.128.2.9 2005-01-12 11:27:07 hannes Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -39,11 +39,7 @@ static const char rcsid[] =
 #include "extract.h"			/* must come after interface.h */
 
 #include "ip.h"
-
-/* Compatibility */
-#ifndef	IPPROTO_ND
-#define	IPPROTO_ND	77
-#endif
+#include "ipproto.h"
 
 /*
  * print the recorded route in an IP RR, LSRR or SSRR option.
@@ -51,14 +47,19 @@ static const char rcsid[] =
 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 ptr;
 	register u_int len;
 
+	if (length < 3) {
+		printf(" [bad length %u]", length);
+		return;
+	}
 	printf(" %s{", type);
 	if ((length + 1) & 3)
-		printf(" [bad length %d]", length);
+		printf(" [bad length %u]", length);
+	ptr = cp[2] - 1;
 	if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
-		printf(" [bad ptr %d]", cp[2]);
+		printf(" [bad ptr %u]", cp[2]);
 
 	type = "";
 	for (len = 3; len < length; len += 4) {
@@ -71,7 +72,7 @@ ip_printroute(const char *type, register const u_char *cp, u_int length)
 }
 
 /*
- * If source-routing is present, return the final destination.
+ * If source-routing is present and valid, return the final destination.
  * Otherwise, return IP destination.
  *
  * This is used for UDP and TCP pseudo-header in the checksum
@@ -89,45 +90,54 @@ ip_finddst(const struct ip *ip)
 	length = (IP_HL(ip) << 2) - sizeof(struct ip);
 
 	for (; length > 0; cp += len, length -= len) {
-		int tt = *cp;
+		int tt;
 
-		if (tt == IPOPT_NOP || tt == IPOPT_EOL)
+		TCHECK(*cp);
+		tt = *cp;
+		if (tt == IPOPT_EOL)
+			break;
+		else if (tt == IPOPT_NOP)
 			len = 1;
 		else {
-			if (&cp[1] >= snapend) {
-				return 0;
-			}
+			TCHECK(cp[1]);
 			len = cp[1];
+			if (len < 2)
+				break;
 		}
-		if (len <= 0) {
-			return 0;
-		}
-		if (&cp[1] >= snapend || cp + len > snapend) {
-			return 0;
-		}
+		TCHECK2(*cp, len);
 		switch (tt) {
 
 		case IPOPT_SSRR:
 		case IPOPT_LSRR:
+			if (len < 7)
+				break;
 			memcpy(&retval, cp + len - 4, 4);
 			return retval;
 		}
 	}
-	return ip->ip_dst.s_addr;
+trunc:
+	memcpy(&retval, &ip->ip_dst.s_addr, sizeof(u_int32_t));
+	return retval;
 }
 
 static void
 ip_printts(register const u_char *cp, u_int length)
 {
-	register u_int ptr = cp[2] - 1;
-	register u_int len = 0;
+	register u_int ptr;
+	register u_int len;
 	int hoplen;
 	const char *type;
 
+	if (length < 4) {
+		printf("[bad length %d]", length);
+		return;
+	}
 	printf(" TS{");
 	hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
 	if ((length - 4) & (hoplen-1))
 		printf("[bad length %d]", length);
+	ptr = cp[2] - 1;
+	len = 0;
 	if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
 		printf("[bad ptr %d]", cp[2]);
 	switch (cp[3]&0xF) {
@@ -181,24 +191,20 @@ ip_optprint(register const u_char *cp, u_int length)
 	register u_int len;
 
 	for (; length > 0; cp += len, length -= len) {
-		int tt = *cp;
+		int tt;
 
+		TCHECK(*cp);
+		tt = *cp;
 		if (tt == IPOPT_NOP || tt == IPOPT_EOL)
 			len = 1;
 		else {
-			if (&cp[1] >= snapend) {
-				printf("[|ip]");
+			TCHECK(cp[1]);
+			len = cp[1];
+			if (len < 2) {
+				printf("[|ip op len %d]", len);
 				return;
 			}
-			len = cp[1];
-		}
-		if (len <= 0) {
-			printf("[|ip op len %d]", len);
-			return;
-		}
-		if (&cp[1] >= snapend || cp + len > snapend) {
-			printf("[|ip]");
-			return;
+			TCHECK2(*cp, len);
 		}
 		switch (tt) {
 
@@ -242,8 +248,11 @@ ip_optprint(register const u_char *cp, u_int length)
 			printf(" RA");
 			if (len != 4)
 				printf("{%d}", len);
-			else if (cp[2] || cp[3])
-				printf("%d.%d", cp[2], cp[3]);
+			else {
+				TCHECK(cp[3]);
+				if (cp[2] || cp[3])
+					printf("%d.%d", cp[2], cp[3]);
+			}
 			break;
 
 		default:
@@ -251,6 +260,10 @@ ip_optprint(register const u_char *cp, u_int length)
 			break;
 		}
 	}
+	return;
+
+trunc:
+	printf("[|ip]");
 }
 
 /*
@@ -362,34 +375,52 @@ ip_print(register const u_char *bp, register u_int length)
 {
 	register const struct ip *ip;
 	register u_int hlen, len, len0, off;
+	const u_char *ipend;
 	register const u_char *cp;
 	u_char nh;
 	int advance;
 	struct protoent *proto;
 	u_int16_t sum, ip_sum;
-	const char *sep = "";
-
-	printf("IP%s ", (((*bp >> 4) & 0xf) == 4) ? "" : "4"); /* print version if != 4 */
 
 	ip = (const struct ip *)bp;
+	if (IP_V(ip) != 4) { /* print version if != 4 */
+	    printf("IP%u ", IP_V(ip));
+	    if (IP_V(ip) == 6)
+		printf(", wrong link-layer encapsulation");
+	}
+        else
+	    printf("IP ");
+
 	if ((u_char *)(ip + 1) > snapend) {
 		printf("[|ip]");
 		return;
 	}
 	if (length < sizeof (struct ip)) {
-		(void)printf("truncated-ip %d", length);
+		(void)printf("truncated-ip %u", length);
 		return;
 	}
 	hlen = IP_HL(ip) * 4;
 	if (hlen < sizeof (struct ip)) {
-		(void)printf("bad-hlen %d", hlen);
+		(void)printf("bad-hlen %u", hlen);
 		return;
 	}
 
 	len = EXTRACT_16BITS(&ip->ip_len);
 	if (length < len)
-		(void)printf("truncated-ip - %d bytes missing! ",
+		(void)printf("truncated-ip - %u bytes missing! ",
 			len - length);
+	if (len < hlen) {
+		(void)printf("bad-len %u", len);
+		return;
+	}
+
+	/*
+	 * Cut off the snapshot length to the end of the IP payload.
+	 */
+	ipend = bp + len;
+	if (ipend < snapend)
+		snapend = ipend;
+
 	len -= hlen;
 	len0 = len;
 
@@ -437,10 +468,8 @@ ip_print(register const u_char *bp, register u_int length)
 	        sum = in_cksum((const u_short *)ip, hlen, 0);
 		if (sum != 0) {
 		    ip_sum = EXTRACT_16BITS(&ip->ip_sum);
-		    (void)printf("%sbad cksum %x (->%x)!", sep,
-			     ip_sum,
+		    (void)printf(", bad cksum %x (->%x)!", ip_sum,
 			     in_cksum_shouldbe(ip_sum, sum));
-		    sep = ", ";
 		}
 	    }
 
@@ -455,9 +484,6 @@ ip_print(register const u_char *bp, register u_int length)
 		cp = (const u_char *)ip + hlen;
 		nh = ip->ip_p;
 
-#ifndef IPPROTO_SCTP
-#define IPPROTO_SCTP 132
-#endif
 		if (nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
 		    nh != IPPROTO_SCTP) {
 			(void)printf("%s > %s: ", ipaddr_string(&ip->ip_src),
@@ -466,42 +492,35 @@ ip_print(register const u_char *bp, register u_int length)
 again:
 		switch (nh) {
 
-#ifndef IPPROTO_AH
-#define IPPROTO_AH	51
-#endif
 		case IPPROTO_AH:
 			nh = *cp;
 			advance = ah_print(cp);
+			if (advance <= 0)
+				break;
 			cp += advance;
 			len -= advance;
 			goto again;
 
-#ifndef IPPROTO_ESP
-#define IPPROTO_ESP	50
-#endif
 		case IPPROTO_ESP:
 		    {
 			int enh, padlen;
 			advance = esp_print(cp, (const u_char *)ip, &enh, &padlen);
+			if (advance <= 0)
+				break;
 			cp += advance;
 			len -= advance + padlen;
-			if (enh < 0)
-				break;
 			nh = enh & 0xff;
 			goto again;
 		    }
 
-#ifndef IPPROTO_IPCOMP
-#define IPPROTO_IPCOMP	108
-#endif
 		case IPPROTO_IPCOMP:
 		    {
 			int enh;
 			advance = ipcomp_print(cp, &enh);
+			if (advance <= 0)
+				break;
 			cp += advance;
 			len -= advance;
-			if (enh < 0)
-				break;
 			nh = enh & 0xff;
 			goto again;
 		    }
@@ -519,12 +538,10 @@ again:
 			break;
 
 		case IPPROTO_ICMP:
-			icmp_print(cp, len, (const u_char *)ip);
+		        /* pass on the MF bit plus the offset to detect fragments */
+			icmp_print(cp, len, (const u_char *)ip, (off & 0x3fff));
 			break;
 
-#ifndef IPPROTO_IGRP
-#define IPPROTO_IGRP 9
-#endif
 		case IPPROTO_IGRP:
 			igrp_print(cp, len, (const u_char *)ip);
 			break;
@@ -534,24 +551,18 @@ again:
 			break;
 
 		case IPPROTO_EGP:
-			egp_print(cp);
+			egp_print(cp, len);
 			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);
 			break;
 
-		case 4:
+		case IPPROTO_IPV4:
 			/* DVMRP multicast tunnel (ip-in-ip encapsulation) */
 			ip_print(cp, len);
 			if (! vflag) {
@@ -561,47 +572,29 @@ again:
 			break;
 
 #ifdef INET6
-#ifndef IP6PROTO_ENCAP
-#define IP6PROTO_ENCAP 41
-#endif
-		case IP6PROTO_ENCAP:
+		case IPPROTO_IPV6:
 			/* ip6-in-ip encapsulation */
 			ip6_print(cp, len);
 			break;
 #endif /*INET6*/
 
-#ifndef IPPROTO_RSVP
-#define IPPROTO_RSVP 46
-#endif
 		case IPPROTO_RSVP:
 			rsvp_print(cp, len);
 			break;
 
-#ifndef IPPROTO_GRE
-#define IPPROTO_GRE 47
-#endif
 		case IPPROTO_GRE:
 			/* do it */
 			gre_print(cp, len);
 			break;
 
-#ifndef IPPROTO_MOBILE
-#define IPPROTO_MOBILE 55
-#endif
 		case IPPROTO_MOBILE:
 			mobile_print(cp, len);
 			break;
 
-#ifndef IPPROTO_PIM
-#define IPPROTO_PIM	103
-#endif
 		case IPPROTO_PIM:
 			pim_print(cp, len);
 			break;
 
-#ifndef IPPROTO_VRRP
-#define IPPROTO_VRRP	112
-#endif
 		case IPPROTO_VRRP:
 			vrrp_print(cp, len, ip->ip_ttl);
 			break;