freebsd-dev/contrib/tcpdump/print-chdlc.c

188 lines
4.4 KiB
C

/* maybe it should be merged into print-ppp.c */
/*
* Copyright (c) 1990, 1991, 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.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.13 2001/09/17 21:57:57 fenner Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <ctype.h>
#include <netdb.h>
#include <pcap.h>
#include <stdio.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
#include "ppp.h"
#include "chdlc.h"
static void chdlc_slarp_print(const u_char *, u_int);
/* Standard CHDLC printer */
void
chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;
++infodelay;
ts_print(&h->ts);
/*
* Some printers want to get back at the link level addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
packetp = p;
snapend = p + caplen;
chdlc_print(p, length, caplen);
putchar('\n');
--infodelay;
if (infoprint)
info(0);
}
void
chdlc_print(register const u_char *p, u_int length, u_int caplen)
{
const struct ip *ip;
u_int proto;
if (caplen < CHDLC_HDRLEN) {
printf("[|chdlc]");
return;
}
proto = EXTRACT_16BITS(&p[2]);
if (eflag) {
switch (p[0]) {
case CHDLC_UNICAST:
printf("unicast ");
break;
case CHDLC_BCAST:
printf("bcast ");
break;
default:
printf("0x%02x ", p[0]);
break;
}
printf("%d %04x: ", length, proto);
}
length -= CHDLC_HDRLEN;
ip = (const struct ip *)(p + CHDLC_HDRLEN);
switch (proto) {
case ETHERTYPE_IP:
ip_print((const u_char *)ip, length);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
ip6_print((const u_char *)ip, length);
break;
#endif
case CHDLC_TYPE_SLARP:
chdlc_slarp_print((const u_char *)ip, length);
break;
#if 0
case CHDLC_TYPE_CDP:
chdlc_cdp_print((const u_char *)ip, length);
break;
#endif
}
if (xflag)
default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
}
struct cisco_slarp {
u_int32_t code;
#define SLARP_REQUEST 0
#define SLARP_REPLY 1
#define SLARP_KEEPALIVE 2
union {
struct {
struct in_addr addr;
struct in_addr mask;
u_int16_t unused[3];
} addr;
struct {
u_int32_t myseq;
u_int32_t yourseq;
u_int16_t rel;
u_int16_t t1;
u_int16_t t2;
} keep;
} un;
};
#define SLARP_LEN 18
static void
chdlc_slarp_print(const u_char *cp, u_int length)
{
const struct cisco_slarp *slarp;
if (length < SLARP_LEN) {
printf("[|slarp]");
return;
}
slarp = (const struct cisco_slarp *)cp;
switch (ntohl(slarp->code)) {
case SLARP_REQUEST:
printf("slarp-request");
break;
case SLARP_REPLY:
printf("slarp-reply %s/%s",
ipaddr_string(&slarp->un.addr.addr),
ipaddr_string(&slarp->un.addr.mask));
break;
case SLARP_KEEPALIVE:
printf("slarp-keepalive my=0x%x your=0x%x ",
(u_int32_t)ntohl(slarp->un.keep.myseq),
(u_int32_t)ntohl(slarp->un.keep.yourseq));
printf("reliability=0x%04x t1=%d.%d",
ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
ntohs(slarp->un.keep.t2));
break;
default:
printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
break;
}
if (SLARP_LEN < length && vflag)
printf("(trailing junk: %d bytes)", length - SLARP_LEN);
}