361 lines
8.4 KiB
C
361 lines
8.4 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: print-tcp.c,v 1.52 96/12/03 10:59:55 vern Exp $ (LBL)";
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcpip.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h"
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/* Compatibility */
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#ifndef TCPOPT_WSCALE
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#define TCPOPT_WSCALE 3 /* window scale factor (rfc1072) */
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#endif
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#ifndef TCPOPT_SACKOK
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#define TCPOPT_SACKOK 4 /* selective ack ok (rfc1072) */
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#endif
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#ifndef TCPOPT_SACK
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#define TCPOPT_SACK 5 /* selective ack (rfc1072) */
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#endif
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#ifndef TCPOPT_ECHO
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#define TCPOPT_ECHO 6 /* echo (rfc1072) */
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#endif
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#ifndef TCPOPT_ECHOREPLY
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#define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */
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#endif
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#ifndef TCPOPT_TIMESTAMP
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#define TCPOPT_TIMESTAMP 8 /* timestamps (rfc1323) */
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#endif
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#ifndef TCPOPT_CC
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#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */
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#endif
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#ifndef TCPOPT_CCNEW
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#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */
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#endif
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#ifndef TCPOPT_CCECHO
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#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */
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#endif
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struct tha {
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struct in_addr src;
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struct in_addr dst;
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u_int port;
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};
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struct tcp_seq_hash {
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struct tcp_seq_hash *nxt;
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struct tha addr;
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tcp_seq seq;
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tcp_seq ack;
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};
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#define TSEQ_HASHSIZE 919
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/* These tcp optinos do not have the size octet */
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#define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP)
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static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE];
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void
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tcp_print(register const u_char *bp, register u_int length,
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register const u_char *bp2)
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{
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register const struct tcphdr *tp;
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register const struct ip *ip;
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register u_char flags;
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register int hlen;
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register char ch;
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u_short sport, dport, win, urp;
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u_int32_t seq, ack;
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tp = (struct tcphdr *)bp;
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ip = (struct ip *)bp2;
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ch = '\0';
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TCHECK(*tp);
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if (length < sizeof(*tp)) {
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(void)printf("truncated-tcp %d", length);
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return;
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}
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sport = ntohs(tp->th_sport);
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dport = ntohs(tp->th_dport);
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seq = ntohl(tp->th_seq);
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ack = ntohl(tp->th_ack);
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win = ntohs(tp->th_win);
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urp = ntohs(tp->th_urp);
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(void)printf("%s.%s > %s.%s: ",
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ipaddr_string(&ip->ip_src), tcpport_string(sport),
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ipaddr_string(&ip->ip_dst), tcpport_string(dport));
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if (qflag) {
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(void)printf("tcp %d", length - tp->th_off * 4);
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return;
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}
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if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH)) {
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if (flags & TH_SYN)
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putchar('S');
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if (flags & TH_FIN)
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putchar('F');
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if (flags & TH_RST)
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putchar('R');
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if (flags & TH_PUSH)
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putchar('P');
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} else
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putchar('.');
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if (!Sflag && (flags & TH_ACK)) {
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register struct tcp_seq_hash *th;
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register int rev;
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struct tha tha;
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/*
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* Find (or record) the initial sequence numbers for
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* this conversation. (we pick an arbitrary
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* collating order so there's only one entry for
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* both directions).
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*/
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if (sport < dport ||
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(sport == dport &&
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ip->ip_src.s_addr < ip->ip_dst.s_addr)) {
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tha.src = ip->ip_src, tha.dst = ip->ip_dst;
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tha.port = sport << 16 | dport;
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rev = 0;
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} else {
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tha.src = ip->ip_dst, tha.dst = ip->ip_src;
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tha.port = dport << 16 | sport;
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rev = 1;
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}
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for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
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th->nxt; th = th->nxt)
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if (!memcmp((char *)&tha, (char *)&th->addr,
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sizeof(th->addr)))
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break;
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if (!th->nxt || flags & TH_SYN) {
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/* didn't find it or new conversation */
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if (th->nxt == NULL) {
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th->nxt = (struct tcp_seq_hash *)
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calloc(1, sizeof(*th));
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if (th->nxt == NULL)
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error("tcp_print: calloc");
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}
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th->addr = tha;
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if (rev)
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th->ack = seq, th->seq = ack - 1;
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else
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th->seq = seq, th->ack = ack - 1;
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} else {
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if (rev)
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seq -= th->ack, ack -= th->seq;
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else
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seq -= th->seq, ack -= th->ack;
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}
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}
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hlen = tp->th_off * 4;
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if (hlen > length) {
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(void)printf(" [bad hdr length]");
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return;
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}
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length -= hlen;
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if (length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
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(void)printf(" %u:%u(%d)", seq, seq + length, length);
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if (flags & TH_ACK)
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(void)printf(" ack %u", ack);
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(void)printf(" win %d", win);
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if (flags & TH_URG)
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(void)printf(" urg %d", urp);
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/*
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* Handle any options.
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*/
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if ((hlen -= sizeof(*tp)) > 0) {
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register const u_char *cp;
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register int i, opt, len, datalen;
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cp = (const u_char *)tp + sizeof(*tp);
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putchar(' ');
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ch = '<';
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while (hlen > 0) {
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putchar(ch);
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TCHECK(*cp);
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opt = *cp++;
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if (ZEROLENOPT(opt))
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len = 1;
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else {
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TCHECK(*cp);
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len = *cp++; /* total including type, len */
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if (len < 2 || len > hlen)
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goto bad;
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--hlen; /* account for length byte */
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}
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--hlen; /* account for type byte */
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datalen = 0;
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/* Bail if "l" bytes of data are not left or were not captured */
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#define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); }
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switch (opt) {
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case TCPOPT_MAXSEG:
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(void)printf("mss");
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datalen = 2;
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LENCHECK(datalen);
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(void)printf(" %u", EXTRACT_16BITS(cp));
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break;
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case TCPOPT_EOL:
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(void)printf("eol");
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break;
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case TCPOPT_NOP:
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(void)printf("nop");
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break;
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case TCPOPT_WSCALE:
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(void)printf("wscale");
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datalen = 1;
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LENCHECK(datalen);
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(void)printf(" %u", *cp);
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break;
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case TCPOPT_SACKOK:
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(void)printf("sackOK");
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break;
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case TCPOPT_SACK:
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(void)printf("sack");
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datalen = len - 2;
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for (i = 0; i < datalen; i += 4) {
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LENCHECK(i + 4);
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/* block-size@relative-origin */
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(void)printf(" %u@%u",
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EXTRACT_16BITS(cp + i + 2),
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EXTRACT_16BITS(cp + i));
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}
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if (datalen % 4)
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(void)printf("[len %d]", len);
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break;
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case TCPOPT_ECHO:
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(void)printf("echo");
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datalen = 4;
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LENCHECK(datalen);
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(void)printf(" %u", EXTRACT_32BITS(cp));
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break;
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case TCPOPT_ECHOREPLY:
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(void)printf("echoreply");
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datalen = 4;
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LENCHECK(datalen);
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(void)printf(" %u", EXTRACT_32BITS(cp));
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break;
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case TCPOPT_TIMESTAMP:
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(void)printf("timestamp");
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datalen = 8;
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LENCHECK(4);
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(void)printf(" %u", EXTRACT_32BITS(cp));
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LENCHECK(datalen);
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(void)printf(" %u", EXTRACT_32BITS(cp + 4));
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break;
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case TCPOPT_CC:
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(void)printf("cc");
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datalen = 4;
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LENCHECK(datalen);
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(void)printf(" %u", EXTRACT_32BITS(cp));
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break;
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case TCPOPT_CCNEW:
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(void)printf("ccnew");
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datalen = 4;
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LENCHECK(datalen);
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(void)printf(" %u", EXTRACT_32BITS(cp));
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break;
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case TCPOPT_CCECHO:
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(void)printf("ccecho");
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datalen = 4;
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LENCHECK(datalen);
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(void)printf(" %u", EXTRACT_32BITS(cp));
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break;
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default:
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(void)printf("opt-%d:", opt);
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datalen = len - 2;
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for (i = 0; i < datalen; ++i) {
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LENCHECK(i);
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(void)printf("%02x", cp[i]);
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}
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break;
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}
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/* Account for data printed */
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cp += datalen;
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hlen -= datalen;
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/* Check specification against observed length */
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++datalen; /* option octet */
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if (!ZEROLENOPT(opt))
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++datalen; /* size octet */
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if (datalen != len)
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(void)printf("[len %d]", len);
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ch = ',';
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if (opt == TCPOPT_EOL)
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break;
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}
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putchar('>');
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}
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return;
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bad:
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fputs("[bad opt]", stdout);
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if (ch != '\0')
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putchar('>');
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return;
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trunc:
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fputs("[|tcp]", stdout);
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if (ch != '\0')
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putchar('>');
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}
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