X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/b92f17aa078a0b8d11d9d05d3f8e58c56b8d9bd5..2d5b082ff9943f7e2d8745bfd460a024c51e58d7:/print-tcp.c

diff --git a/print-tcp.c b/print-tcp.c
index cd1299d9..21d855ed 100644
--- a/print-tcp.c
+++ b/print-tcp.c
@@ -21,25 +21,20 @@
 
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.95 2001-12-10 08:21:24 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.98 2002-08-01 08:53:31 risso Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <sys/param.h>
-#include <sys/time.h>
+#include <tcpdump-stdinc.h>
 
 #include <rpc/rpc.h>
 
-#include <netinet/in.h>
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <ctype.h>
-#include <unistd.h>
 
 #include "interface.h"
 #include "addrtoname.h"
@@ -122,7 +117,10 @@ static int tcp_cksum(register const struct ip *ip,
 	phu.ph.mbz = 0;
 	phu.ph.proto = IPPROTO_TCP;
 	memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
-	memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
+	if (IP_HL(ip) == 5)
+		memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
+	else
+		phu.ph.dst = ip_finddst(ip);
 
 	sp = &phu.pa[0];
 	return in_cksum((u_short *)tp, len,
@@ -393,12 +391,14 @@ tcp_print(register const u_char *bp, register u_int length,
 	}
 
 	if (IP_V(ip) == 4 && vflag && !fragmented) {
-		int sum;
+		u_int16_t sum, tcp_sum;
 		if (TTEST2(tp->th_sport, length)) {
 			sum = tcp_cksum(ip, tp, length);
-			if (sum != 0)
-				(void)printf(" [bad tcp cksum %x!]", sum);
-			else
+			if (sum != 0) {
+				tcp_sum = ntohs(tp->th_sum);
+				(void)printf(" [bad tcp cksum %x (->%x)!]",
+				    tcp_sum, in_cksum_shouldbe(tcp_sum, sum));
+			} else
 				(void)printf(" [tcp sum ok]");
 		}
 	}