NetBSD/dist/tcpdump/print-pppoe.c

238 lines
6.1 KiB
C

/* $NetBSD: print-pppoe.c,v 1.4 2002/05/31 09:45:46 itojun 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: /tcpdump/master/tcpdump/print-pppoe.c,v 1.16 2002/05/29 10:32:01 guy Exp (LBL)";
#else
__RCSID("$NetBSD: print-pppoe.c,v 1.4 2002/05/31 09:45:46 itojun Exp $");
#endif
#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 "ppp.h"
#include "ethertype.h"
#include "ether.h"
#include "extract.h" /* must come after interface.h */
/* Codes */
enum {
PPPOE_PADI = 0x09,
PPPOE_PADO = 0x07,
PPPOE_PADR = 0x19,
PPPOE_PADS = 0x65,
PPPOE_PADT = 0xa7
};
static struct tok pppoecode2str[] = {
{ PPPOE_PADI, "PADI" },
{ PPPOE_PADO, "PADO" },
{ PPPOE_PADR, "PADR" },
{ PPPOE_PADS, "PADS" },
{ PPPOE_PADT, "PADT" },
{ 0, "" }, /* PPP Data */
{ 0, NULL }
};
/* Tags */
enum {
PPPOE_EOL = 0,
PPPOE_SERVICE_NAME = 0x0101,
PPPOE_AC_NAME = 0x0102,
PPPOE_HOST_UNIQ = 0x0103,
PPPOE_AC_COOKIE = 0x0104,
PPPOE_VENDOR = 0x0105,
PPPOE_RELAY_SID = 0x0110,
PPPOE_SERVICE_NAME_ERROR = 0x0201,
PPPOE_AC_SYSTEM_ERROR = 0x0202,
PPPOE_GENERIC_ERROR = 0x0203
};
static struct tok pppoetag2str[] = {
{ PPPOE_EOL, "EOL" },
{ PPPOE_SERVICE_NAME, "Service-Name" },
{ PPPOE_AC_NAME, "AC-Name" },
{ PPPOE_HOST_UNIQ, "Host-Uniq" },
{ PPPOE_AC_COOKIE, "AC-Cookie" },
{ PPPOE_VENDOR, "Vendor-Specific" },
{ PPPOE_RELAY_SID, "Relay-Session-ID" },
{ PPPOE_SERVICE_NAME_ERROR, "Service-Name-Error" },
{ PPPOE_AC_SYSTEM_ERROR, "AC-System-Error" },
{ PPPOE_GENERIC_ERROR, "Generic-Error" },
{ 0, NULL }
};
#define PPPOE_HDRLEN 6
void
pppoe_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;
u_int hdr_len;
++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;
hdr_len = pppoe_print(p, length);
/*
* If "-x" was specified, print stuff past the PPPoE and PPP headers,
* if there's anything to print.
*/
if (xflag && caplen > hdr_len)
default_print(p + hdr_len, caplen - hdr_len);
putchar('\n');
--infodelay;
if (infoprint)
info(0);
}
u_int
pppoe_print(register const u_char *bp, u_int length)
{
u_short pppoe_ver, pppoe_type, pppoe_code, pppoe_sessionid, pppoe_length;
const u_char *pppoe_packet, *pppoe_payload;
pppoe_packet = bp;
if (pppoe_packet > snapend) {
printf("[|pppoe]");
return (PPPOE_HDRLEN);
}
pppoe_ver = (pppoe_packet[0] & 0xF0) >> 4;
pppoe_type = (pppoe_packet[0] & 0x0F);
pppoe_code = pppoe_packet[1];
pppoe_sessionid = EXTRACT_16BITS(pppoe_packet + 2);
pppoe_length = EXTRACT_16BITS(pppoe_packet + 4);
pppoe_payload = pppoe_packet + PPPOE_HDRLEN;
if (snapend < pppoe_payload) {
printf(" truncated PPPoE");
return (PPPOE_HDRLEN);
}
if (pppoe_ver != 1) {
printf(" [ver %d]",pppoe_ver);
}
if (pppoe_type != 1) {
printf(" [type %d]",pppoe_type);
}
printf("PPPoE %s", tok2str(pppoecode2str, "PAD-%x", pppoe_code));
if (pppoe_code == PPPOE_PADI && pppoe_length > 1484 - PPPOE_HDRLEN) {
printf(" [len %d!]",pppoe_length);
}
if (pppoe_sessionid) {
printf(" [ses 0x%x]", pppoe_sessionid);
}
if (pppoe_payload + pppoe_length < snapend) {
#if 0
const u_char *x = pppoe_payload + pppoe_length;
printf(" [length %d (%d extra bytes)]",
pppoe_length, snapend - pppoe_payload - pppoe_length);
default_print(x, snapend - x);
#endif
snapend = pppoe_payload+pppoe_length;
}
if (pppoe_code) {
/* PPP session packets don't contain tags */
u_short tag_type = 0xffff, tag_len;
const u_char *p = pppoe_payload;
/*
* loop invariant:
* p points to next tag,
* tag_type is previous tag or 0xffff for first iteration
*/
while (tag_type && p + 4 < pppoe_payload + length &&
p + 4 < snapend) {
tag_type = EXTRACT_16BITS(p);
tag_len = EXTRACT_16BITS(p + 2);
p += 4;
/* p points to tag_value */
if (tag_len) {
int isascii = 1;
const u_char *v = p;
u_short l;
for (v = p; v < p + tag_len; v++)
if (*v >= 127 || *v < 32) {
isascii = 0;
break;
}
/* TODO print UTF8 decoded text */
if (isascii) {
l = (tag_len < 80 ? tag_len : 80);
printf(" [%s \"%*.*s\"]",
tok2str(pppoetag2str, "TAG-0x%x", tag_type),
l, l, p);
} else
printf(" [%s UTF8]",
tok2str(pppoetag2str, "TAG-0x%x", tag_type));
} else
printf(" [%s]", tok2str(pppoetag2str,
"TAG-0x%x", tag_type));
p += tag_len;
/* p points to next tag */
}
return (0);
} else {
/* PPPoE data */
printf(" ");
return (PPPOE_HDRLEN + ppp_print(pppoe_payload, pppoe_length));
}
}