2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
23 static const char rcsid[] =
24 "@(#) $Header: print-tcp.c,v 1.55 97/06/15 13:20:28 leres Exp $ (LBL)";
27 #include <sys/param.h>
30 #include <netinet/in.h>
31 #include <netinet/in_systm.h>
32 #include <netinet/ip.h>
33 #include <netinet/ip_var.h>
34 #include <netinet/tcp.h>
35 #include <netinet/tcpip.h>
45 #include "interface.h"
46 #include "addrtoname.h"
51 #define TCPOPT_WSCALE 3 /* window scale factor (rfc1072) */
54 #define TCPOPT_SACKOK 4 /* selective ack ok (rfc1072) */
57 #define TCPOPT_SACK 5 /* selective ack (rfc1072) */
60 #define TCPOPT_ECHO 6 /* echo (rfc1072) */
62 #ifndef TCPOPT_ECHOREPLY
63 #define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */
65 #ifndef TCPOPT_TIMESTAMP
66 #define TCPOPT_TIMESTAMP 8 /* timestamps (rfc1323) */
69 #define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */
72 #define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */
75 #define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */
85 struct tcp_seq_hash *nxt;
91 #define TSEQ_HASHSIZE 919
93 /* These tcp optinos do not have the size octet */
94 #define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP)
96 static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE];
100 tcp_print(register const u_char *bp, register u_int length,
101 register const u_char *bp2)
103 register const struct tcphdr *tp;
104 register const struct ip *ip;
105 register u_char flags;
108 u_short sport, dport, win, urp;
111 tp = (struct tcphdr *)bp;
112 ip = (struct ip *)bp2;
115 if (length < sizeof(*tp)) {
116 (void)printf("truncated-tcp %d", length);
120 sport = ntohs(tp->th_sport);
121 dport = ntohs(tp->th_dport);
122 seq = ntohl(tp->th_seq);
123 ack = ntohl(tp->th_ack);
124 win = ntohs(tp->th_win);
125 urp = ntohs(tp->th_urp);
127 (void)printf("%s.%s > %s.%s: ",
128 ipaddr_string(&ip->ip_src), tcpport_string(sport),
129 ipaddr_string(&ip->ip_dst), tcpport_string(dport));
132 (void)printf("tcp %d", length - tp->th_off * 4);
135 if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH)) {
147 if (!Sflag && (flags & TH_ACK)) {
148 register struct tcp_seq_hash *th;
152 * Find (or record) the initial sequence numbers for
153 * this conversation. (we pick an arbitrary
154 * collating order so there's only one entry for
159 ip->ip_src.s_addr < ip->ip_dst.s_addr)) {
160 tha.src = ip->ip_src, tha.dst = ip->ip_dst;
161 tha.port = sport << 16 | dport;
164 tha.src = ip->ip_dst, tha.dst = ip->ip_src;
165 tha.port = dport << 16 | sport;
169 for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
170 th->nxt; th = th->nxt)
171 if (!memcmp((char *)&tha, (char *)&th->addr,
175 if (!th->nxt || flags & TH_SYN) {
176 /* didn't find it or new conversation */
177 if (th->nxt == NULL) {
178 th->nxt = (struct tcp_seq_hash *)
179 calloc(1, sizeof(*th));
181 error("tcp_print: calloc");
185 th->ack = seq, th->seq = ack - 1;
187 th->seq = seq, th->ack = ack - 1;
190 seq -= th->ack, ack -= th->seq;
192 seq -= th->seq, ack -= th->ack;
195 hlen = tp->th_off * 4;
197 (void)printf(" [bad hdr length]");
201 if (length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
202 (void)printf(" %u:%u(%d)", seq, seq + length, length);
204 (void)printf(" ack %u", ack);
206 (void)printf(" win %d", win);
209 (void)printf(" urg %d", urp);
211 * Handle any options.
213 if ((hlen -= sizeof(*tp)) > 0) {
214 register const u_char *cp;
215 register int i, opt, len, datalen;
217 cp = (const u_char *)tp + sizeof(*tp);
228 len = *cp++; /* total including type, len */
229 if (len < 2 || len > hlen)
231 --hlen; /* account for length byte */
233 --hlen; /* account for type byte */
236 /* Bail if "l" bytes of data are not left or were not captured */
237 #define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); }
245 (void)printf(" %u", EXTRACT_16BITS(cp));
258 (void)printf("wscale");
261 (void)printf(" %u", *cp);
265 (void)printf("sackOK");
269 (void)printf("sack");
271 for (i = 0; i < datalen; i += 4) {
273 /* block-size@relative-origin */
274 (void)printf(" %u@%u",
275 EXTRACT_16BITS(cp + i + 2),
276 EXTRACT_16BITS(cp + i));
279 (void)printf("[len %d]", len);
283 (void)printf("echo");
286 (void)printf(" %u", EXTRACT_32BITS(cp));
289 case TCPOPT_ECHOREPLY:
290 (void)printf("echoreply");
293 (void)printf(" %u", EXTRACT_32BITS(cp));
296 case TCPOPT_TIMESTAMP:
297 (void)printf("timestamp");
300 (void)printf(" %u", EXTRACT_32BITS(cp));
302 (void)printf(" %u", EXTRACT_32BITS(cp + 4));
309 (void)printf(" %u", EXTRACT_32BITS(cp));
313 (void)printf("ccnew");
316 (void)printf(" %u", EXTRACT_32BITS(cp));
320 (void)printf("ccecho");
323 (void)printf(" %u", EXTRACT_32BITS(cp));
327 (void)printf("opt-%d:", opt);
329 for (i = 0; i < datalen; ++i) {
331 (void)printf("%02x", cp[i]);
336 /* Account for data printed */
340 /* Check specification against observed length */
341 ++datalen; /* option octet */
342 if (!ZEROLENOPT(opt))
343 ++datalen; /* size octet */
345 (void)printf("[len %d]", len);
347 if (opt == TCPOPT_EOL)
354 fputs("[bad opt]", stdout);
359 fputs("[|tcp]", stdout);