304 lines
7.2 KiB
C
304 lines
7.2 KiB
C
/* $NetBSD: print-tcp.c,v 1.7 1996/05/26 18:35:14 fvdl Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
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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 char rcsid[] =
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"@(#) Header: print-tcp.c,v 1.28 94/06/16 01:26:40 mccanne 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 <sys/types.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 <rpc/rpc.h>
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#include <stdio.h>
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#ifdef __STDC__
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#include <stdlib.h>
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#endif
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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 "nfs.h"
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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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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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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 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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u_short sport, dport, win, urp;
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tcp_seq seq, ack;
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tp = (struct tcphdr *)bp;
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ip = (struct ip *)bp2;
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if ((const u_char *)(tp + 1) > snapend) {
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printf("[|tcp]");
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return;
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}
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if (length < sizeof(struct tcphdr)) {
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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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hlen = tp->th_off * 4;
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length -= hlen;
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/*
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* If data present and NFS port used, assume NFS.
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* Pass offset of data plus 4 bytes for RPC TCP msg length
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* to NFS print routines.
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*/
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if (!qflag) {
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if ((u_char *)tp + 4 + sizeof(struct rpc_msg) <= snapend &&
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dport == NFS_PORT) {
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nfsreq_print((u_char *)tp + hlen + 4, length,
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(u_char *)ip);
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return;
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}
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else if ((u_char *)tp + 4 + sizeof(struct rpc_msg) <= snapend &&
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sport == NFS_PORT) {
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nfsreply_print((u_char *)tp + hlen + 4, length,
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(u_char *)ip);
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return;
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}
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}
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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);
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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 (!bcmp((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)
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th->nxt = (struct tcp_seq_hash *)
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calloc(1, sizeof (*th));
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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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if (length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
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(void)printf(" %lu:%lu(%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(struct tcphdr)) > 0) {
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register const u_char *cp = (const u_char *)tp + sizeof(*tp);
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int i;
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char ch = '<';
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putchar(' ');
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while (--hlen >= 0) {
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putchar(ch);
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switch (*cp++) {
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case TCPOPT_MAXSEG:
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{
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(void)printf("mss %d", cp[1] << 8 | cp[2]);
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if (*cp != 4)
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(void)printf("[len %d]", *cp);
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cp += 3;
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hlen -= 3;
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break;
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}
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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 %d", cp[1]);
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if (*cp != 3)
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(void)printf("[len %d]", *cp);
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cp += 2;
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hlen -= 2;
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break;
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case TCPOPT_SACKOK:
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(void)printf("sackOK");
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if (*cp != 2)
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(void)printf("[len %d]", *cp);
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cp += 1;
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hlen -= 1;
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break;
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case TCPOPT_ECHO:
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{
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(void)printf("echo %u",
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cp[1] << 24 | cp[2] << 16 |
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cp[3] << 8 | cp[4]);
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if (*cp != 6)
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(void)printf("[len %d]", *cp);
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cp += 5;
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hlen -= 5;
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break;
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}
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case TCPOPT_ECHOREPLY:
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{
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(void)printf("echoreply %u",
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cp[1] << 24 | cp[2] << 16 |
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cp[3] << 8 | cp[4]);
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if (*cp != 6)
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(void)printf("[len %d]", *cp);
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cp += 5;
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hlen -= 5;
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break;
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}
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case TCPOPT_TIMESTAMP:
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{
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(void)printf("timestamp %lu %lu",
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cp[1] << 24 | cp[2] << 16 |
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cp[3] << 8 | cp[4],
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cp[5] << 24 | cp[6] << 16 |
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cp[7] << 8 | cp[8]);
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if (*cp != 10)
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(void)printf("[len %d]", *cp);
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cp += 9;
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hlen -= 9;
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break;
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}
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default:
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(void)printf("opt-%d:", cp[-1]);
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for (i = *cp++ - 2, hlen -= i + 1; i > 0; --i)
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(void)printf("%02x", *cp++);
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break;
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}
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ch = ',';
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}
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putchar('>');
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}
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}
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