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/*
* 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.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-lcp.c,v 1.9 2000/10/06 04:23:12 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
#include "ppp.h"
/* Codes */
enum {
LCP_CONFREQ = 1,
LCP_CONFACK = 2,
LCP_CONFNAK = 3,
LCP_CONFREJ = 4,
LCP_TERMREQ = 5,
LCP_TERMACK = 6,
LCP_CODEREJ = 7,
LCP_PROTREJ = 8,
LCP_ECHOREQ = 9,
LCP_ECHOREP = 10,
LCP_DISCARD = 11
};
static struct tok lcpcode2str[] = {
{ LCP_CONFREQ, "ConfReq" },
{ LCP_CONFACK, "ConfAck" },
{ LCP_CONFNAK, "ConfNak" },
{ LCP_CONFREJ, "ConfRej" },
{ LCP_TERMREQ, "TermReq" },
{ LCP_TERMACK, "TermAck" },
{ LCP_CODEREJ, "CodeRej" },
{ LCP_PROTREJ, "ProtRej" },
{ LCP_ECHOREQ, "EchoReq" },
{ LCP_ECHOREP, "EchoRep" },
{ LCP_DISCARD, "Discard" },
{ 0, NULL }
};
enum {
LCP_RESERVED = 0,
LCP_MRU = 1,
LCP_ASYNCMAP = 2,
LCP_AUTHPROTO = 3,
LCP_QUALPROTO = 4,
LCP_MAGICNUM = 5,
LCP_PCOMP = 7,
LCP_ACFCOMP = 8,
LCP_CALLBACK = 13
};
static struct tok lcpoption2str[] = {
{ LCP_RESERVED, "reserved"},
{ LCP_MRU, "mru"},
{ LCP_ASYNCMAP, "asyncmap"},
{ LCP_AUTHPROTO, "auth"},
{ LCP_QUALPROTO, "qual"},
{ LCP_MAGICNUM, "magic"},
{ LCP_PCOMP, "pcomp"},
{ LCP_ACFCOMP, "acfcomp"},
{ LCP_CALLBACK, "callback"},
{ 0, NULL }
};
static struct tok lcpauth2str[] = {
{0xc023, "PAP"},
{0xc223, "CHAP"},
{ 0, NULL }
};
static struct tok lcpqual2str[] = {
{0xc025, "LQR"},
{ 0, NULL }
};
static struct tok lcpchap2str[] = {
{0x05, "MD5"},
{0x80, "MS"},
{ 0, NULL }
};
void
lcp_print(register const u_char *bp, u_int length)
{
u_short lcp_code, lcp_id, lcp_length;
const u_char *lcp_data;
lcp_data = bp+4;
if (snapend < lcp_data) {
printf(" [LCP|]");
return;
}
lcp_code = bp[0];
lcp_id = bp[1];
lcp_length = EXTRACT_16BITS(bp+2);
printf("LCP %s id=0x%x", tok2str(lcpcode2str, "LCP-#%d", lcp_code), lcp_id);
switch (lcp_code) {
case LCP_CONFREQ:
case LCP_CONFACK:
case LCP_CONFNAK:
case LCP_CONFREJ:
/* Print Options */
{
u_char lcpopt_type, lcpopt_length;
const u_char *p=lcp_data;
while (p+2 < lcp_data+lcp_length && p+2 < snapend) {
lcpopt_type = p[0];
lcpopt_length = p[1];
p+=2;
printf(" <%s ",tok2str(lcpoption2str, "option-#%d", lcpopt_type));
if (lcpopt_length)
switch (lcpopt_type) {
case LCP_MRU:
if (snapend < p+2) return;
printf("%d",ntohs(*(u_short*)p));
if (lcpopt_length != 4) printf(" len=%d!",lcpopt_length);
break;
case LCP_AUTHPROTO:
if (snapend < p+2) return;
printf("%s",tok2str(lcpauth2str, "AUTH-%#x", ntohs(*(u_short*)p)));
if (lcpopt_length < 4) printf(" len=%d!",lcpopt_length);
if (lcpopt_length >= 5 && p < snapend)
printf(" %s",tok2str(lcpchap2str, "%#x", p[0]));
break;
case LCP_QUALPROTO:
if (snapend < p+2) return;
printf("%s",tok2str(lcpqual2str, "QUAL-%#x", ntohs(*(u_short*)p)));
if (lcpopt_length < 4) printf(" len=%d!",lcpopt_length);
/* Print data field of auth? */
break;
case LCP_ASYNCMAP:
case LCP_MAGICNUM:
if (snapend < p+4) return;
printf("%#x", (unsigned)ntohl(*(u_long*)p));
if (lcpopt_length != 6) printf(" len=%d!",lcpopt_length);
break;
case LCP_PCOMP:
case LCP_ACFCOMP:
case LCP_RESERVED:
if (lcpopt_length != 2) printf(" len=%d!",lcpopt_length);
break;
default:
if (lcpopt_length != 2) printf(" len=%d",lcpopt_length);
break;
}
printf(">");
p+=lcpopt_length-2;
}
}
break;
case LCP_ECHOREQ:
case LCP_ECHOREP:
case LCP_DISCARD:
if (snapend < lcp_data+4) return;
printf(" magic=%#x", (unsigned)ntohl(*(u_long *) lcp_data));
lcp_data +=4;
break;
case LCP_PROTREJ:
if (snapend < lcp_data+2) return;
printf(" prot=%s", tok2str(ppptype2str, "PROT-%#x", ntohs(*(u_short *) lcp_data)));
/* TODO print rejected packet too ? */
break;
case LCP_CODEREJ:
if (snapend < lcp_data+4) return;
printf(" ");
lcp_print(lcp_data, (lcp_length+lcp_data > snapend ? snapend-lcp_data : lcp_length));
break;
case LCP_TERMREQ:
case LCP_TERMACK:
break;
default:
break;
}
return;
}
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