397 lines
9.2 KiB
C
397 lines
9.2 KiB
C
/* $NetBSD: print-tcp.c,v 1.9 1997/10/03 20:38:03 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static const char rcsid[] =
|
|
"@(#) Header: print-tcp.c,v 1.55 97/06/15 13:20:28 leres Exp (LBL)";
|
|
#else
|
|
__RCSID("$NetBSD: print-tcp.c,v 1.9 1997/10/03 20:38:03 christos Exp $");
|
|
#endif
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.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>
|
|
|
|
#include <rpc/rpc.h>
|
|
|
|
#ifdef HAVE_MEMORY_H
|
|
#include <memory.h>
|
|
#endif
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "extract.h"
|
|
|
|
#include "nfs.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
|
|
#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
|
|
|
|
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
|
|
|
|
/* These tcp optinos do not have the size octet */
|
|
#define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP)
|
|
|
|
static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE];
|
|
|
|
|
|
void
|
|
tcp_print(register const u_char *bp, register u_int length,
|
|
register const u_char *bp2)
|
|
{
|
|
register const struct tcphdr *tp;
|
|
register const struct ip *ip;
|
|
register u_char flags;
|
|
register int hlen;
|
|
register char ch;
|
|
u_short sport, dport, win, urp;
|
|
tcp_seq seq, ack;
|
|
|
|
tp = (struct tcphdr *)bp;
|
|
ip = (struct ip *)bp2;
|
|
ch = '\0';
|
|
TCHECK(*tp);
|
|
if (length < sizeof(*tp)) {
|
|
(void)printf("truncated-tcp %d", length);
|
|
return;
|
|
}
|
|
|
|
sport = ntohs(tp->th_sport);
|
|
dport = ntohs(tp->th_dport);
|
|
seq = ntohl(tp->th_seq);
|
|
ack = ntohl(tp->th_ack);
|
|
win = ntohs(tp->th_win);
|
|
urp = ntohs(tp->th_urp);
|
|
hlen = tp->th_off * 4;
|
|
|
|
/*
|
|
* If data present and NFS port used, assume NFS.
|
|
* Pass offset of data plus 4 bytes for RPC TCP msg length
|
|
* to NFS print routines.
|
|
*/
|
|
if (!qflag) {
|
|
u_int len = length - hlen;
|
|
if ((u_char *)tp + 4 + sizeof(struct rpc_msg) <= snapend &&
|
|
dport == NFS_PORT) {
|
|
nfsreq_print((u_char *)tp + hlen + 4, len,
|
|
(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, len,
|
|
(u_char *)ip);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
(void)printf("%s.%s > %s.%s: ",
|
|
ipaddr_string(&ip->ip_src), tcpport_string(sport),
|
|
ipaddr_string(&ip->ip_dst), tcpport_string(dport));
|
|
|
|
if (qflag) {
|
|
(void)printf("tcp %d", length - hlen);
|
|
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 (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 = 1;
|
|
}
|
|
|
|
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
|
|
th->nxt; th = th->nxt)
|
|
if (!memcmp((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 == NULL) {
|
|
th->nxt = (struct tcp_seq_hash *)
|
|
calloc(1, sizeof(*th));
|
|
if (th->nxt == NULL)
|
|
error("tcp_print: calloc");
|
|
}
|
|
th->addr = tha;
|
|
if (rev)
|
|
th->ack = seq, th->seq = ack - 1;
|
|
else
|
|
th->seq = seq, th->ack = ack - 1;
|
|
} else {
|
|
if (rev)
|
|
seq -= th->ack, ack -= th->seq;
|
|
else
|
|
seq -= th->seq, ack -= th->ack;
|
|
}
|
|
}
|
|
if (hlen > length) {
|
|
(void)printf(" [bad hdr length]");
|
|
return;
|
|
}
|
|
length -= hlen;
|
|
if (length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
|
|
(void)printf(" %lu:%lu(%d)", (long) seq, (long) (seq + length),
|
|
length);
|
|
if (flags & TH_ACK)
|
|
(void)printf(" ack %u", ack);
|
|
|
|
(void)printf(" win %d", win);
|
|
|
|
if (flags & TH_URG)
|
|
(void)printf(" urg %d", urp);
|
|
/*
|
|
* Handle any options.
|
|
*/
|
|
if ((hlen -= sizeof(*tp)) > 0) {
|
|
register const u_char *cp;
|
|
register int i, opt, len, datalen;
|
|
|
|
cp = (const u_char *)tp + sizeof(*tp);
|
|
putchar(' ');
|
|
ch = '<';
|
|
while (hlen > 0) {
|
|
putchar(ch);
|
|
TCHECK(*cp);
|
|
opt = *cp++;
|
|
if (ZEROLENOPT(opt))
|
|
len = 1;
|
|
else {
|
|
TCHECK(*cp);
|
|
len = *cp++; /* total including type, len */
|
|
if (len < 2 || len > hlen)
|
|
goto bad;
|
|
--hlen; /* account for length byte */
|
|
}
|
|
--hlen; /* account for type byte */
|
|
datalen = 0;
|
|
|
|
/* Bail if "l" bytes of data are not left or were not captured */
|
|
#define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); }
|
|
|
|
switch (opt) {
|
|
|
|
case TCPOPT_MAXSEG:
|
|
(void)printf("mss");
|
|
datalen = 2;
|
|
LENCHECK(datalen);
|
|
(void)printf(" %u", EXTRACT_16BITS(cp));
|
|
|
|
break;
|
|
|
|
case TCPOPT_EOL:
|
|
(void)printf("eol");
|
|
break;
|
|
|
|
case TCPOPT_NOP:
|
|
(void)printf("nop");
|
|
break;
|
|
|
|
case TCPOPT_WSCALE:
|
|
(void)printf("wscale");
|
|
datalen = 1;
|
|
LENCHECK(datalen);
|
|
(void)printf(" %u", *cp);
|
|
break;
|
|
|
|
case TCPOPT_SACKOK:
|
|
(void)printf("sackOK");
|
|
break;
|
|
|
|
case TCPOPT_SACK:
|
|
(void)printf("sack");
|
|
datalen = len - 2;
|
|
for (i = 0; i < datalen; i += 4) {
|
|
LENCHECK(i + 4);
|
|
/* block-size@relative-origin */
|
|
(void)printf(" %u@%u",
|
|
EXTRACT_16BITS(cp + i + 2),
|
|
EXTRACT_16BITS(cp + i));
|
|
}
|
|
if (datalen % 4)
|
|
(void)printf("[len %d]", len);
|
|
break;
|
|
|
|
case TCPOPT_ECHO:
|
|
(void)printf("echo");
|
|
datalen = 4;
|
|
LENCHECK(datalen);
|
|
(void)printf(" %u", EXTRACT_32BITS(cp));
|
|
break;
|
|
|
|
case TCPOPT_ECHOREPLY:
|
|
(void)printf("echoreply");
|
|
datalen = 4;
|
|
LENCHECK(datalen);
|
|
(void)printf(" %u", EXTRACT_32BITS(cp));
|
|
break;
|
|
|
|
case TCPOPT_TIMESTAMP:
|
|
(void)printf("timestamp");
|
|
datalen = 8;
|
|
LENCHECK(4);
|
|
(void)printf(" %u", EXTRACT_32BITS(cp));
|
|
LENCHECK(datalen);
|
|
(void)printf(" %u", EXTRACT_32BITS(cp + 4));
|
|
break;
|
|
|
|
case TCPOPT_CC:
|
|
(void)printf("cc");
|
|
datalen = 4;
|
|
LENCHECK(datalen);
|
|
(void)printf(" %u", EXTRACT_32BITS(cp));
|
|
break;
|
|
|
|
case TCPOPT_CCNEW:
|
|
(void)printf("ccnew");
|
|
datalen = 4;
|
|
LENCHECK(datalen);
|
|
(void)printf(" %u", EXTRACT_32BITS(cp));
|
|
break;
|
|
|
|
case TCPOPT_CCECHO:
|
|
(void)printf("ccecho");
|
|
datalen = 4;
|
|
LENCHECK(datalen);
|
|
(void)printf(" %u", EXTRACT_32BITS(cp));
|
|
break;
|
|
|
|
default:
|
|
(void)printf("opt-%d:", opt);
|
|
datalen = len - 2;
|
|
for (i = 0; i < datalen; ++i) {
|
|
LENCHECK(i);
|
|
(void)printf("%02x", cp[i]);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Account for data printed */
|
|
cp += datalen;
|
|
hlen -= datalen;
|
|
|
|
/* Check specification against observed length */
|
|
++datalen; /* option octet */
|
|
if (!ZEROLENOPT(opt))
|
|
++datalen; /* size octet */
|
|
if (datalen != len)
|
|
(void)printf("[len %d]", len);
|
|
ch = ',';
|
|
if (opt == TCPOPT_EOL)
|
|
break;
|
|
}
|
|
putchar('>');
|
|
}
|
|
return;
|
|
bad:
|
|
fputs("[bad opt]", stdout);
|
|
if (ch != '\0')
|
|
putchar('>');
|
|
return;
|
|
trunc:
|
|
fputs("[|tcp]", stdout);
|
|
if (ch != '\0')
|
|
putchar('>');
|
|
}
|
|
|