*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.70 2000-07-30 05:56:11 assar Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.107.2.5 2004-07-28 20:11:31 guy 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 <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/tcp.h>
-
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <ctype.h>
-#include <unistd.h>
-
-#ifdef INET6
-#include <netinet/ip6.h>
-#endif
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
+#include "tcp.h"
+
+#include "ip.h"
+#ifdef INET6
+#include "ip6.h"
+#endif
+#include "ipproto.h"
+
+#include "nameser.h"
+
static void print_tcp_rst_data(register const u_char *sp, u_int length);
#define MAX_RST_DATA_LEN 30
-/* Compatibility */
-#ifndef TCPOPT_WSCALE
-#define TCPOPT_WSCALE 3 /* window scale factor (rfc1072) */
-#endif
-#ifndef TCPOPT_SACKOK
-#define TCPOPT_SACKOK 4 /* selective ack ok (rfc1072) */
-#endif
-#ifndef TCPOPT_SACK
-#define TCPOPT_SACK 5 /* selective ack (rfc1072) */
-#endif
-#ifndef TCPOPT_ECHO
-#define TCPOPT_ECHO 6 /* echo (rfc1072) */
-#endif
-#ifndef TCPOPT_ECHOREPLY
-#define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */
-#endif
-#ifndef TCPOPT_TIMESTAMP
-#define TCPOPT_TIMESTAMP 8 /* timestamps (rfc1323) */
-#endif
-#ifndef TCPOPT_CC
-#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */
-#endif
-#ifndef TCPOPT_CCNEW
-#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */
-#endif
-#ifndef TCPOPT_CCECHO
-#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */
-#endif
-
-/*
- * Definitions required for ECN
- * for use if the OS running tcpdump does not have ECN
- */
-#ifndef TH_ECNECHO
-#define TH_ECNECHO 0x40 /* ECN Echo in tcp header */
-#endif
-#ifndef TH_CWR
-#define TH_CWR 0x80 /* ECN Cwnd Reduced in tcp header*/
-#endif
struct tha {
#ifndef INET6
#define BGP_PORT 179
#endif
#define NETBIOS_SSN_PORT 139
+#ifndef PPTP_PORT
+#define PPTP_PORT 1723
+#endif
+#define BEEP_PORT 10288
#ifndef NFS_PORT
#define NFS_PORT 2049
#endif
+#define MSDP_PORT 639
+#define LDP_PORT 646
+
+static int tcp_cksum(register const struct ip *ip,
+ register const struct tcphdr *tp,
+ register u_int len)
+{
+ union phu {
+ struct phdr {
+ u_int32_t src;
+ u_int32_t dst;
+ u_char mbz;
+ u_char proto;
+ u_int16_t len;
+ } ph;
+ u_int16_t pa[6];
+ } phu;
+ const u_int16_t *sp;
+
+ /* pseudo-header.. */
+ phu.ph.len = htons((u_int16_t)len);
+ phu.ph.mbz = 0;
+ phu.ph.proto = IPPROTO_TCP;
+ memcpy(&phu.ph.src, &ip->ip_src.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,
+ 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;
+ register const u_int16_t *sp;
+ u_int32_t sum;
+ 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;
+
+ sum = 0;
+ for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
+ sum += phu.pa[i];
+
+ sp = (const u_int16_t *)tp;
+
+ for (i = 0; i < (len & ~1); i += 2)
+ sum += *sp++;
+
+ if (len & 1)
+ sum += htons((*(const u_int8_t *)sp) << 8);
+
+ while (sum > 0xffff)
+ sum = (sum & 0xffff) + (sum >> 16);
+ sum = ~sum & 0xffff;
+
+ return (sum);
+}
+#endif
void
tcp_print(register const u_char *bp, register u_int length,
- register const u_char *bp2)
+ register const u_char *bp2, int fragmented)
{
register const struct tcphdr *tp;
register const struct ip *ip;
register u_char flags;
- register int hlen;
+ register u_int hlen;
register char ch;
u_int16_t sport, dport, win, urp;
u_int32_t seq, ack, thseq, thack;
tp = (struct tcphdr *)bp;
ip = (struct ip *)bp2;
#ifdef INET6
- if (ip->ip_v == 6)
+ if (IP_V(ip) == 6)
ip6 = (struct ip6_hdr *)bp2;
else
ip6 = NULL;
return;
}
- sport = ntohs(tp->th_sport);
- dport = ntohs(tp->th_dport);
+ sport = EXTRACT_16BITS(&tp->th_sport);
+ dport = EXTRACT_16BITS(&tp->th_dport);
-
- hlen = tp->th_off * 4;
+ hlen = TH_OFF(tp) * 4;
/*
- * If data present and NFS port used, assume NFS.
+ * 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) {
+ if (!qflag && hlen >= sizeof(*tp) && hlen <= length) {
if ((u_char *)tp + 4 + sizeof(struct rpc_msg) <= snapend &&
dport == NFS_PORT) {
- nfsreq_print((u_char *)tp + hlen + 4, length-hlen,
+ nfsreq_print((u_char *)tp + hlen + 4, length - hlen,
(u_char *)ip);
return;
} else if ((u_char *)tp + 4 + sizeof(struct rpc_msg)
<= snapend &&
sport == NFS_PORT) {
- nfsreply_print((u_char *)tp + hlen + 4,length-hlen,
+ nfsreply_print((u_char *)tp + hlen + 4, length - hlen,
(u_char *)ip);
return;
}
}
}
+ if (hlen < sizeof(*tp)) {
+ (void)printf(" tcp %d [bad hdr length %u - too short, < %lu]",
+ length - hlen, hlen, (unsigned long)sizeof(*tp));
+ return;
+ }
+
TCHECK(*tp);
- seq = (u_int32_t)ntohl(tp->th_seq);
- ack = (u_int32_t)ntohl(tp->th_ack);
- win = ntohs(tp->th_win);
- urp = ntohs(tp->th_urp);
+ seq = EXTRACT_32BITS(&tp->th_seq);
+ ack = EXTRACT_32BITS(&tp->th_ack);
+ win = EXTRACT_16BITS(&tp->th_win);
+ urp = EXTRACT_16BITS(&tp->th_urp);
if (qflag) {
- (void)printf("tcp %d", length - tp->th_off * 4);
+ (void)printf("tcp %d", length - hlen);
+ if (hlen > length) {
+ (void)printf(" [bad hdr length %u - too long, > %u]",
+ hlen, length);
+ }
return;
}
if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH|
if (!Sflag && (flags & TH_ACK)) {
register struct tcp_seq_hash *th;
+ const void *src, *dst;
register int rev;
struct tha tha;
/*
memset(&tha, 0, sizeof(tha));
rev = 0;
if (ip6) {
- if (sport > dport) {
+ src = &ip6->ip6_src;
+ dst = &ip6->ip6_dst;
+ if (sport > dport)
rev = 1;
- } else if (sport == dport) {
- int i;
-
- for (i = 0; i < 4; i++) {
- if (((u_int32_t *)(&ip6->ip6_src))[i] >
- ((u_int32_t *)(&ip6->ip6_dst))[i]) {
+ else if (sport == dport) {
+ if (memcmp(src, dst, sizeof ip6->ip6_dst) > 0)
rev = 1;
- break;
- }
- }
}
if (rev) {
- tha.src = ip6->ip6_dst;
- tha.dst = ip6->ip6_src;
+ memcpy(&tha.src, dst, sizeof ip6->ip6_dst);
+ memcpy(&tha.dst, src, sizeof ip6->ip6_src);
tha.port = dport << 16 | sport;
} else {
- tha.dst = ip6->ip6_dst;
- tha.src = ip6->ip6_src;
+ memcpy(&tha.dst, dst, sizeof ip6->ip6_dst);
+ memcpy(&tha.src, src, sizeof ip6->ip6_src);
tha.port = sport << 16 | dport;
}
} else {
- if (sport > dport ||
- (sport == dport &&
- ip->ip_src.s_addr > ip->ip_dst.s_addr)) {
+ src = &ip->ip_src;
+ dst = &ip->ip_dst;
+ if (sport > dport)
rev = 1;
+ else if (sport == dport) {
+ if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
+ rev = 1;
}
if (rev) {
- *(struct in_addr *)&tha.src = ip->ip_dst;
- *(struct in_addr *)&tha.dst = ip->ip_src;
+ memcpy(&tha.src, dst, sizeof ip->ip_dst);
+ memcpy(&tha.dst, src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
- *(struct in_addr *)&tha.dst = ip->ip_dst;
- *(struct in_addr *)&tha.src = ip->ip_src;
+ memcpy(&tha.dst, dst, sizeof ip->ip_dst);
+ memcpy(&tha.src, src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
}
#else
- if (sport < dport ||
- (sport == dport &&
- ip->ip_src.s_addr < ip->ip_dst.s_addr)) {
- tha.src = ip->ip_src, tha.dst = ip->ip_dst;
- tha.port = sport << 16 | dport;
- rev = 0;
- } else {
- tha.src = ip->ip_dst, tha.dst = ip->ip_src;
- tha.port = dport << 16 | sport;
+ rev = 0;
+ src = &ip->ip_src;
+ dst = &ip->ip_dst;
+ if (sport > dport)
rev = 1;
+ else if (sport == dport) {
+ if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
+ rev = 1;
+ }
+ if (rev) {
+ memcpy(&tha.src, dst, sizeof ip->ip_dst);
+ memcpy(&tha.dst, src, sizeof ip->ip_src);
+ tha.port = dport << 16 | sport;
+ } else {
+ memcpy(&tha.dst, dst, sizeof ip->ip_dst);
+ memcpy(&tha.src, src, sizeof ip->ip_src);
+ tha.port = sport << 16 | dport;
}
#endif
threv = rev;
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
- if (!memcmp((char *)&tha, (char *)&th->addr,
- sizeof(th->addr)))
+ if (memcmp((char *)&tha, (char *)&th->addr,
+ sizeof(th->addr)) == 0)
break;
if (!th->nxt || (flags & TH_SYN)) {
th->ack = seq, th->seq = ack - 1;
else
th->seq = seq, th->ack = ack - 1;
-
} else {
if (rev)
seq -= th->ack, ack -= th->seq;
thseq = thack = threv = 0;
}
if (hlen > length) {
- (void)printf(" [bad hdr length]");
+ (void)printf(" [bad hdr length %u - too long, > %u]",
+ hlen, length);
return;
}
+
+ if (IP_V(ip) == 4 && vflag && !fragmented) {
+ u_int16_t sum, tcp_sum;
+ if (TTEST2(tp->th_sport, length)) {
+ sum = tcp_cksum(ip, tp, length);
+ if (sum != 0) {
+ tcp_sum = EXTRACT_16BITS(&tp->th_sum);
+ (void)printf(" [bad tcp cksum %x (->%x)!]",
+ tcp_sum, in_cksum_shouldbe(tcp_sum, sum));
+ } else
+ (void)printf(" [tcp sum ok]");
+ }
+ }
+#ifdef INET6
+ if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !fragmented) {
+ int sum;
+ if (TTEST2(tp->th_sport, length)) {
+ sum = tcp6_cksum(ip6, tp, length);
+ if (sum != 0)
+ (void)printf(" [bad tcp cksum %x!]", sum);
+ else
+ (void)printf(" [tcp sum ok]");
+ }
+ }
+#endif
+
length -= hlen;
if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
- (void)printf(" %u:%u(%d)", seq, seq + length, length);
+ (void)printf(" %u:%u(%u)", seq, seq + length, length);
if (flags & TH_ACK)
(void)printf(" ack %u", ack);
/*
* Handle any options.
*/
- if ((hlen -= sizeof(*tp)) > 0) {
+ if (hlen > sizeof(*tp)) {
register const u_char *cp;
- register int i, opt, len, datalen;
+ register u_int i, opt, datalen;
+ register u_int len;
+ hlen -= sizeof(*tp);
cp = (const u_char *)tp + sizeof(*tp);
putchar(' ');
ch = '<';
break;
default:
- (void)printf("opt-%d:", opt);
+ (void)printf("opt-%u:", opt);
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
/*
* Decode payload if necessary.
*/
- bp += (tp->th_off * 4);
+ bp += TH_OFF(tp) * 4;
if (flags & TH_RST) {
if (vflag)
print_tcp_rst_data(bp, length);
telnet_print(bp, length);
} else if (sport == BGP_PORT || dport == BGP_PORT)
bgp_print(bp, length);
+ else if (sport == PPTP_PORT || dport == PPTP_PORT)
+ pptp_print(bp);
+#ifdef TCPDUMP_DO_SMB
else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT)
nbt_tcp_print(bp, length);
+#endif
+ else if (sport == BEEP_PORT || dport == BEEP_PORT)
+ beep_print(bp, length);
+ else if (length > 2 &&
+ (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT ||
+ sport == MULTICASTDNS_PORT || dport == MULTICASTDNS_PORT)) {
+ /*
+ * TCP DNS query has 2byte length at the head.
+ * XXX packet could be unaligned, it can go strange
+ */
+ ns_print(bp + 2, length - 2, 0);
+ } else if (sport == MSDP_PORT || dport == MSDP_PORT) {
+ msdp_print(bp, length);
+ }
+ else if (sport == LDP_PORT || dport == LDP_PORT)
+ printf(": LDP, length: %u", length);
}
return;
bad:
putchar(' ');
while (length-- && sp <= snapend) {
c = *sp++;
- if (isprint(c))
- putchar(c);
- else
- putchar('.');
+ safeputchar(c);
}
putchar(']');
}
projects / tcpdump / blobdiff