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Initial import, 0.1 + pk 0.2.4-B1
[unix-history] / contrib / tcpdump / tcpdump / print-tcp.c
/*
* Copyright (c) 1988-1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char rcsid[] =
"@(#) $Header: print-tcp.c,v 1.18 92/05/25 14:29:04 mccanne Exp $ (LBL)";
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#ifdef X10
#include <X/X.h>
#include <X/Xproto.h>
#endif
#include "interface.h"
#include "addrtoname.h"
#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
struct tha {
struct in_addr src;
struct in_addr dst;
u_int port;
};
struct tcp_seq_hash {
struct tcp_seq_hash *nxt;
struct tha addr;
tcp_seq seq;
tcp_seq ack;
};
#define TSEQ_HASHSIZE 919
static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE];
void
tcp_print(tp, length, ip)
register struct tcphdr *tp;
register int length;
register struct ip *ip;
{
register u_char flags;
register int hlen;
if ((u_char *)(tp + 1) > snapend) {
printf("[|tcp]");
return;
}
if (length < sizeof(struct tcphdr)) {
(void)printf("truncated-tcp %d", length);
return;
}
NTOHS(tp->th_sport);
NTOHS(tp->th_dport);
NTOHL(tp->th_seq);
NTOHL(tp->th_ack);
NTOHS(tp->th_win);
NTOHS(tp->th_urp);
(void)printf("%s.%s > %s.%s: ",
ipaddr_string(&ip->ip_src), tcpport_string(tp->th_sport),
ipaddr_string(&ip->ip_dst), tcpport_string(tp->th_dport));
if (!qflag) {
#ifdef X10
register int be;
if ((be = (tp->th_sport == X_TCP_BI_PORT ||
tp->th_dport == X_TCP_BI_PORT)) ||
tp->th_sport == X_TCP_LI_PORT ||
tp->th_dport == X_TCP_LI_PORT) {
register XReq *xp = (XReq *)(tp + 1);
x10_print(xp, length - sizeof(struct tcphdr), be);
return;
}
#endif
}
if (qflag) {
(void)printf("tcp %d", length - tp->th_off * 4);
return;
}
if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH)) {
if (flags & TH_SYN)
putchar('S');
if (flags & TH_FIN)
putchar('F');
if (flags & TH_RST)
putchar('R');
if (flags & TH_PUSH)
putchar('P');
} else
putchar('.');
if (!Sflag && (flags & TH_ACK)) {
register struct tcp_seq_hash *th;
register int rev;
struct tha tha;
/*
* Find (or record) the initial sequence numbers for
* this conversation. (we pick an arbitrary
* collating order so there's only one entry for
* both directions).
*/
if (tp->th_sport < tp->th_dport ||
(tp->th_sport == tp->th_dport &&
ip->ip_src.s_addr < ip->ip_dst.s_addr)) {
tha.src = ip->ip_src, tha.dst = ip->ip_dst;
tha.port = tp->th_sport << 16 | tp->th_dport;
rev = 0;
} else {
tha.src = ip->ip_dst, tha.dst = ip->ip_src;
tha.port = tp->th_dport << 16 | tp->th_sport;
rev = 1;
}
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
if (!bcmp((char *)&tha, (char *)&th->addr,
sizeof(th->addr)))
break;
if (!th->nxt || flags & TH_SYN) {
/* didn't find it or new conversation */
if (!th->nxt)
th->nxt = (struct tcp_seq_hash *)
calloc(1, sizeof (*th));
th->addr = tha;
if (rev)
th->ack = tp->th_seq, th->seq = tp->th_ack - 1;
else
th->seq = tp->th_seq, th->ack = tp->th_ack - 1;
} else {
if (rev)
tp->th_seq -= th->ack, tp->th_ack -= th->seq;
else
tp->th_seq -= th->seq, tp->th_ack -= th->ack;
}
}
hlen = tp->th_off * 4;
length -= hlen;
if (length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
(void)printf(" %lu:%lu(%d)", tp->th_seq, tp->th_seq + length,
length);
if (flags & TH_ACK)
(void)printf(" ack %lu", tp->th_ack);
(void)printf(" win %d", tp->th_win);
if (flags & TH_URG)
(void)printf(" urg %d", tp->th_urp);
/*
* Handle any options.
*/
if ((hlen -= sizeof(struct tcphdr)) > 0) {
register u_char *cp = (u_char *)tp + sizeof(struct tcphdr);
int i;
char ch = '<';
putchar(' ');
while (--hlen >= 0) {
putchar(ch);
switch (*cp++) {
case TCPOPT_MAXSEG:
{
u_short mss;
#ifdef TCPDUMP_ALIGN
bcopy((char *)cp + 1, (char *)&mss,
sizeof(mss));
#else
mss = *(u_short *)(cp + 1);
#endif
(void)printf("mss %d", ntohs(mss));
if (*cp != 4)
(void)printf("[len %d]", *cp);
cp += 3;
hlen -= 3;
break;
}
case TCPOPT_EOL:
(void)printf("eol");
break;
case TCPOPT_NOP:
(void)printf("nop");
break;
case TCPOPT_WSCALE:
(void)printf("wscale %d", cp[1]);
if (*cp != 3)
(void)printf("[len %d]", *cp);
cp += 2;
hlen -= 2;
break;
case TCPOPT_SACKOK:
(void)printf("sackOK");
if (*cp != 2)
(void)printf("[len %d]", *cp);
cp += 1;
hlen -= 1;
break;
case TCPOPT_ECHO:
{
u_long v;
#ifdef TCPDUMP_ALIGN
bcopy((char *)cp + 1, (char *)&v,
sizeof(v));
#else
v = *(u_long *)(cp + 1);
#endif
(void)printf("echo %lu", v);
if (*cp != 6)
(void)printf("[len %d]", *cp);
cp += 5;
hlen -= 5;
break;
}
case TCPOPT_ECHOREPLY:
{
u_long v;
#ifdef TCPDUMP_ALIGN
bcopy((char *)cp + 1, (char *)&v,
sizeof(v));
#else
v = *(u_long *)(cp + 1);
#endif
(void)printf("echoreply %lu", v);
if (*cp != 6)
(void)printf("[len %d]", *cp);
cp += 5;
hlen -= 5;
break;
}
default:
(void)printf("opt-%d:", cp[-1]);
for (i = *cp++ - 2, hlen -= i + 1; i > 0; --i)
(void)printf("%02x", *cp++);
break;
}
ch = ',';
}
putchar('>');
}
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.