+/* $NetBSD: print-tcp.c,v 1.9 2007/07/26 18:15:12 plunky Exp $ */
+
/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
#ifndef lint
static const char rcsid[] _U_ =
-"@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.128 2007-01-29 19:19:51 hannes Exp $ (LBL)";
+"@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.135 2008-11-09 23:35:03 mcr Exp $ (LBL)";
+#else
+__RCSID("$NetBSD: print-tcp.c,v 1.8 2007/07/24 11:53:48 drochner Exp $");
#endif
#ifdef HAVE_CONFIG_H
#ifdef HAVE_LIBCRYPTO
#include <openssl/md5.h>
-
-#define SIGNATURE_VALID 0
-#define SIGNATURE_INVALID 1
-#define CANT_CHECK_SIGNATURE 2
+#include <signature.h>
static int tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp,
const u_char *data, int length, const u_char *rcvsig);
{ TCPOPT_CCECHO, "" },
{ TCPOPT_SIGNATURE, "md5" },
{ TCPOPT_AUTH, "enhanced auth" },
+ { TCPOPT_UTO, "uto" },
{ 0, NULL }
};
sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]);
}
-#ifdef INET6
-static int tcp6_cksum(const struct ip6_hdr *ip6, const struct tcphdr *tp,
- u_int len)
-{
- size_t i;
- u_int32_t sum = 0;
- union {
- struct {
- struct in6_addr ph_src;
- struct in6_addr ph_dst;
- u_int32_t ph_len;
- u_int8_t ph_zero[3];
- u_int8_t ph_nxt;
- } ph;
- u_int16_t pa[20];
- } phu;
-
- /* pseudo-header */
- memset(&phu, 0, sizeof(phu));
- phu.ph.ph_src = ip6->ip6_src;
- phu.ph.ph_dst = ip6->ip6_dst;
- phu.ph.ph_len = htonl(len);
- phu.ph.ph_nxt = IPPROTO_TCP;
-
- for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
- sum += phu.pa[i];
-
- return in_cksum((u_short *)tp, len, sum);
-}
-#endif
-
void
tcp_print(register const u_char *bp, register u_int length,
register const u_char *bp2, int fragmented)
register char ch;
u_int16_t sport, dport, win, urp;
u_int32_t seq, ack, thseq, thack;
+ u_int utoval;
int threv;
#ifdef INET6
register const struct ip6_hdr *ip6;
hlen = TH_OFF(tp) * 4;
/*
- * If data present, header length valid, and NFS port used,
- * assume NFS.
- * Pass offset of data plus 4 bytes for RPC TCP msg length
- * to NFS print routines.
- */
- if (!qflag && hlen >= sizeof(*tp) && hlen <= length) {
- if ((u_char *)tp + 4 + sizeof(struct sunrpc_msg) <= snapend &&
- dport == NFS_PORT) {
- nfsreq_print((u_char *)tp + hlen + 4, length - hlen,
- (u_char *)ip);
- return;
- } else if ((u_char *)tp + 4 + sizeof(struct sunrpc_msg)
- <= snapend &&
- sport == NFS_PORT) {
- nfsreply_print((u_char *)tp + hlen + 4, length - hlen,
- (u_char *)ip);
- return;
+ * If data present, header length valid, and NFS port used,
+ * assume NFS.
+ * Pass offset of data plus 4 bytes for RPC TCP msg length
+ * to NFS print routines.
+ */
+ if (!qflag && hlen >= sizeof(*tp) && hlen <= length &&
+ (length - hlen) >= 4) {
+ u_char *fraglenp;
+ u_int32_t fraglen;
+ register struct sunrpc_msg *rp;
+ enum sunrpc_msg_type direction;
+
+ fraglenp = (u_char *)tp + hlen;
+ if (TTEST2(*fraglenp, 4)) {
+ fraglen = EXTRACT_32BITS(fraglenp) & 0x7FFFFFFF;
+ if (fraglen > (length - hlen) - 4)
+ fraglen = (length - hlen) - 4;
+ rp = (struct sunrpc_msg *)(fraglenp + 4);
+ if (TTEST(rp->rm_direction)) {
+ direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction);
+ if (dport == NFS_PORT &&
+ direction == SUNRPC_CALL) {
+ nfsreq_print((u_char *)rp, fraglen,
+ (u_char *)ip);
+ return;
+ }
+ if (sport == NFS_PORT &&
+ direction == SUNRPC_REPLY) {
+ nfsreply_print((u_char *)rp, fraglen,
+ (u_char *)ip);
+ return;
+ }
+ }
}
}
#ifdef INET6
if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !Kflag && !fragmented) {
u_int16_t sum,tcp_sum;
if (TTEST2(tp->th_sport, length)) {
- sum = tcp6_cksum(ip6, tp, length);
+ sum = nextproto6_cksum(ip6, (u_short *)tp, length, IPPROTO_TCP);
(void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
if (sum != 0) {
tcp_sum = EXTRACT_16BITS(&tp->th_sum);
- (void)printf(" (incorrect (-> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum));
+ (void)printf(" (incorrect -> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum));
} else
(void)printf(" (correct)");
#endif
length -= hlen;
- if (vflag > 1 || flags & (TH_SYN | TH_FIN | TH_RST)) {
+ if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) {
(void)printf(", seq %u", seq);
if (length > 0) {
cp = (const u_char *)tp + sizeof(*tp);
printf(", options [");
while (hlen > 0) {
- putchar(ch);
+ if (ch != '\0')
+ putchar(ch);
TCHECK(*cp);
opt = *cp++;
if (ZEROLENOPT(opt))
*/
break;
+ case TCPOPT_UTO:
+ datalen = 2;
+ LENCHECK(datalen);
+ utoval = EXTRACT_16BITS(cp);
+ (void)printf("0x%x", utoval);
+ if (utoval & 0x0001)
+ utoval = (utoval >> 1) * 60;
+ else
+ utoval >>= 1;
+ (void)printf(" %u", utoval);
+ break;
+
default:
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
#ifdef TCPDUMP_DO_SMB
else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT)
nbt_tcp_print(bp, length);
+ else if (sport == SMB_PORT || dport == SMB_PORT)
+ smb_tcp_print(bp, length);
#endif
else if (sport == BEEP_PORT || dport == BEEP_PORT)
beep_print(bp, length);
u_int16_t savecsum, tlen;
#ifdef INET6
struct ip6_hdr *ip6;
-#endif
u_int32_t len32;
u_int8_t nxt;
+#endif
+
+ if (data + length > snapend) {
+ printf("snaplen too short, ");
+ return (CANT_CHECK_SIGNATURE);
+ }
tp1 = *tp;
- if (tcpmd5secret == NULL)
+ if (sigsecret == NULL) {
+ printf("shared secret not supplied with -M, ");
return (CANT_CHECK_SIGNATURE);
+ }
MD5_Init(&ctx);
/*
ip6 = (struct ip6_hdr *)ip;
MD5_Update(&ctx, (char *)&ip6->ip6_src, sizeof(ip6->ip6_src));
MD5_Update(&ctx, (char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst));
- len32 = htonl(ntohs(ip6->ip6_plen));
+ len32 = htonl(EXTRACT_16BITS(&ip6->ip6_plen));
MD5_Update(&ctx, (char *)&len32, sizeof(len32));
nxt = 0;
MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
nxt = IPPROTO_TCP;
MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
#endif
- } else
+ } else {
+#ifdef INET6
+ printf("IP version not 4 or 6, ");
+#else
+ printf("IP version not 4, ");
+#endif
return (CANT_CHECK_SIGNATURE);
+ }
/*
* Step 2: Update MD5 hash with TCP header, excluding options.
/*
* Step 4: Update MD5 hash with shared secret.
*/
- MD5_Update(&ctx, tcpmd5secret, strlen(tcpmd5secret));
+ MD5_Update(&ctx, sigsecret, strlen(sigsecret));
MD5_Final(sig, &ctx);
if (memcmp(rcvsig, sig, TCP_SIGLEN) == 0)
projects / tcpdump / blobdiff