NetBSD/usr.sbin/tcpdump/print-ppp.c

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/* $NetBSD: print-ppp.c,v 1.4 1997/10/03 19:55:36 christos Exp $ */
/*
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* 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.
*/
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#include <sys/cdefs.h>
#ifndef lint
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#if 0
static const char rcsid[] =
"@(#) Header: print-ppp.c,v 1.26 97/06/12 14:21:29 leres Exp (LBL)";
#else
__RCSID("$NetBSD: print-ppp.c,v 1.4 1997/10/03 19:55:36 christos Exp $");
#endif
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/ioctl.h>
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#if __STDC__
struct mbuf;
struct rtentry;
#endif
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <ctype.h>
#include <netdb.h>
#include <pcap.h>
#include <stdio.h>
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#include "interface.h"
#include "addrtoname.h"
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#include "ppp.h"
/* XXX This goes somewhere else. */
#define PPP_HDRLEN 4
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/* Standard PPP printer */
void
ppp_if_print(u_char *user, const struct pcap_pkthdr *h,
register const u_char *p)
{
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register u_int length = h->len;
register u_int caplen = h->caplen;
const struct ip *ip;
ts_print(&h->ts);
if (caplen < PPP_HDRLEN) {
printf("[|ppp]");
goto out;
}
/*
* 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;
if (eflag)
printf("%c %4d %02x %04x: ", p[0] ? 'O' : 'I', length,
p[1], ntohs(*(u_short *)&p[2]));
length -= PPP_HDRLEN;
ip = (struct ip *)(p + PPP_HDRLEN);
ip_print((const u_char *)ip, length);
if (xflag)
default_print((const u_char *)ip, caplen - PPP_HDRLEN);
out:
putchar('\n');
}
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/* proto type to string mapping */
static struct tok ptype2str[] = {
{ PPP_VJC, "VJC" },
{ PPP_VJNC, "VJNC" },
{ PPP_OSI, "OSI" },
{ PPP_LCP, "LCP" },
{ PPP_IPCP, "IPCP" },
{ 0, NULL }
};
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#define PPP_BSDI_HDRLEN 24
/* BSD/OS specific PPP printer */
void
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ppp_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h,
register const u_char *p)
{
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register u_int length = h->len;
register u_int caplen = h->caplen;
register int hdrlength;
u_short ptype;
ts_print(&h->ts);
if (caplen < PPP_BSDI_HDRLEN) {
printf("[|ppp]");
goto out;
}
/*
* 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;
hdrlength = 0;
if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
if (eflag)
printf("%02x %02x ", p[0], p[1]);
p += 2;
hdrlength = 2;
}
if (eflag)
printf("%d ", length);
/* Retrieve the protocol type */
if (*p & 01) {
/* Compressed protocol field */
ptype = *p;
if (eflag)
printf("%02x ", ptype);
p++;
hdrlength += 1;
} else {
/* Un-compressed protocol field */
ptype = ntohs(*(u_short *)p);
if (eflag)
printf("%04x ", ptype);
p += 2;
hdrlength += 2;
}
length -= hdrlength;
if (ptype == PPP_IP)
ip_print(p, length);
else
printf("%s ", tok2str(ptype2str, "proto-#%d", ptype));
if (xflag)
default_print((const u_char *)p, caplen - hdrlength);
out:
putchar('\n');
}