226 lines
6.1 KiB
C
226 lines
6.1 KiB
C
/* $NetBSD: print-pppoe.c,v 1.6 2004/09/28 12:27:02 he Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Original code by Greg Stark <gsstark@mit.edu>
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static const char rcsid[] _U_ =
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"@(#) Header: /tcpdump/master/tcpdump/print-pppoe.c,v 1.24.2.4 2004/03/24 03:04:22 guy Exp (LBL)";
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#else
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__RCSID("$NetBSD: print-pppoe.c,v 1.6 2004/09/28 12:27:02 he Exp $");
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#endif
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ppp.h"
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#include "ethertype.h"
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#include "ether.h"
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#include "extract.h" /* must come after interface.h */
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/* Codes */
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enum {
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PPPOE_PADI = 0x09,
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PPPOE_PADO = 0x07,
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PPPOE_PADR = 0x19,
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PPPOE_PADS = 0x65,
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PPPOE_PADT = 0xa7
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};
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static struct tok pppoecode2str[] = {
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{ PPPOE_PADI, "PADI" },
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{ PPPOE_PADO, "PADO" },
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{ PPPOE_PADR, "PADR" },
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{ PPPOE_PADS, "PADS" },
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{ PPPOE_PADT, "PADT" },
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{ 0, "" }, /* PPP Data */
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{ 0, NULL }
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};
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/* Tags */
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enum {
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PPPOE_EOL = 0,
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PPPOE_SERVICE_NAME = 0x0101,
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PPPOE_AC_NAME = 0x0102,
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PPPOE_HOST_UNIQ = 0x0103,
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PPPOE_AC_COOKIE = 0x0104,
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PPPOE_VENDOR = 0x0105,
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PPPOE_RELAY_SID = 0x0110,
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PPPOE_SERVICE_NAME_ERROR = 0x0201,
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PPPOE_AC_SYSTEM_ERROR = 0x0202,
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PPPOE_GENERIC_ERROR = 0x0203
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};
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static struct tok pppoetag2str[] = {
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{ PPPOE_EOL, "EOL" },
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{ PPPOE_SERVICE_NAME, "Service-Name" },
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{ PPPOE_AC_NAME, "AC-Name" },
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{ PPPOE_HOST_UNIQ, "Host-Uniq" },
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{ PPPOE_AC_COOKIE, "AC-Cookie" },
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{ PPPOE_VENDOR, "Vendor-Specific" },
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{ PPPOE_RELAY_SID, "Relay-Session-ID" },
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{ PPPOE_SERVICE_NAME_ERROR, "Service-Name-Error" },
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{ PPPOE_AC_SYSTEM_ERROR, "AC-System-Error" },
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{ PPPOE_GENERIC_ERROR, "Generic-Error" },
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{ 0, NULL }
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};
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#define PPPOE_HDRLEN 6
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#define MAXTAGPRINT 80
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u_int
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pppoe_if_print(const struct pcap_pkthdr *h, register const u_char *p)
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{
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return (pppoe_print(p, h->len));
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}
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u_int
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pppoe_print(register const u_char *bp, u_int length)
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{
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u_short pppoe_ver, pppoe_type, pppoe_code, pppoe_sessionid, pppoe_length;
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const u_char *pppoe_packet, *pppoe_payload;
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pppoe_packet = bp;
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TCHECK2(*pppoe_packet, PPPOE_HDRLEN);
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pppoe_ver = (pppoe_packet[0] & 0xF0) >> 4;
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pppoe_type = (pppoe_packet[0] & 0x0F);
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pppoe_code = pppoe_packet[1];
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pppoe_sessionid = EXTRACT_16BITS(pppoe_packet + 2);
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pppoe_length = EXTRACT_16BITS(pppoe_packet + 4);
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pppoe_payload = pppoe_packet + PPPOE_HDRLEN;
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if (snapend < pppoe_payload) {
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printf(" truncated PPPoE");
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return (PPPOE_HDRLEN);
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}
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if (pppoe_ver != 1) {
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printf(" [ver %d]",pppoe_ver);
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}
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if (pppoe_type != 1) {
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printf(" [type %d]",pppoe_type);
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}
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printf("PPPoE %s", tok2str(pppoecode2str, "PAD-%x", pppoe_code));
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if (pppoe_code == PPPOE_PADI && pppoe_length > 1484 - PPPOE_HDRLEN) {
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printf(" [len %d!]",pppoe_length);
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}
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if (pppoe_sessionid) {
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printf(" [ses 0x%x]", pppoe_sessionid);
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}
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if (pppoe_payload + pppoe_length < snapend && snapend-pppoe_payload+14 > 64) {
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/* (small packets are probably just padded up to the ethernet
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minimum of 64 bytes) */
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printf(" [length %d (%d extra bytes)]",
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pppoe_length, (int)(snapend - pppoe_payload - pppoe_length));
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#if RESPECT_PAYLOAD_LENGTH
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snapend = pppoe_payload+pppoe_length;
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#else
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/* Actual PPPoE implementations appear to ignore the payload
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length and use the full ethernet frame anyways */
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pppoe_length = snapend-pppoe_payload;
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#endif
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}
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if (pppoe_code) {
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/* PPP session packets don't contain tags */
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u_short tag_type = 0xffff, tag_len;
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const u_char *p = pppoe_payload;
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/*
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* loop invariant:
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* p points to next tag,
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* tag_type is previous tag or 0xffff for first iteration
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*/
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while (tag_type && p + 4 < pppoe_payload + length &&
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p + 4 < snapend) {
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tag_type = EXTRACT_16BITS(p);
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tag_len = EXTRACT_16BITS(p + 2);
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p += 4;
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/* p points to tag_value */
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if (tag_len) {
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unsigned isascii = 0, isgarbage = 0;
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const u_char *v = p;
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char tag_str[MAXTAGPRINT];
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unsigned tag_str_len = 0;
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/* TODO print UTF-8 decoded text */
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for (v = p; v < p + tag_len && tag_str_len < MAXTAGPRINT-1; v++)
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if (*v >= 32 && *v < 127) {
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tag_str[tag_str_len++] = *v;
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isascii++;
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} else {
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tag_str[tag_str_len++] = '.';
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isgarbage++;
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}
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tag_str[tag_str_len] = 0;
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if (isascii > isgarbage) {
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printf(" [%s \"%*.*s\"]",
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tok2str(pppoetag2str, "TAG-0x%x", tag_type),
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(int)tag_str_len,
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(int)tag_str_len,
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tag_str);
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} else {
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/* Print hex, not fast to abuse printf but this doesn't get used much */
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printf(" [%s 0x", tok2str(pppoetag2str, "TAG-0x%x", tag_type));
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for (v=p; v<p+tag_len; v++) {
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printf("%02X", *v);
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}
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printf("]");
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}
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} else
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printf(" [%s]", tok2str(pppoetag2str,
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"TAG-0x%x", tag_type));
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p += tag_len;
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/* p points to next tag */
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}
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return (0);
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} else {
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/* PPPoE data */
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printf(" ");
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return (PPPOE_HDRLEN + ppp_print(pppoe_payload, pppoe_length));
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}
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trunc:
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printf("[|pppoe]");
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return (PPPOE_HDRLEN);
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}
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