/* * 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. *  * Original code by Greg Stark <gsstark@mit.edu>  */#ifndef lintstatic const char rcsid[] _U_ ="@(#) $Header: /tcpdump/master/tcpdump/print-pppoe.c,v 1.31 2005-04-26 19:48:38 guy Exp $ (LBL)";#endif#ifdef HAVE_CONFIG_H#include "config.h"#endif#include <tcpdump-stdinc.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#define MAXTAGPRINT 80u_intpppoe_if_print(const struct pcap_pkthdr *h, register const u_char *p){	return (pppoe_print(p, h->len));}u_intpppoe_print(register const u_char *bp, u_int length){	u_int16_t pppoe_ver, pppoe_type, pppoe_code, pppoe_sessionid;	u_int pppoe_length;	const u_char *pppoe_packet, *pppoe_payload;	if (length < PPPOE_HDRLEN) {		(void)printf("truncated-pppoe %u", length);		return (length);	}	length -= PPPOE_HDRLEN;	pppoe_packet = bp;	TCHECK2(*pppoe_packet, 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 (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 %u!]",pppoe_length);	}	if (pppoe_length > length) {		printf(" [len %u > %u!]", pppoe_length, length);		pppoe_length = length;	}	if (pppoe_sessionid) {		printf(" [ses 0x%x]", pppoe_sessionid);	}	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 current tag,		 * tag_type is previous tag or 0xffff for first iteration		 */		while (tag_type && p < pppoe_payload + pppoe_length) {			TCHECK2(*p, 4);			tag_type = EXTRACT_16BITS(p);			tag_len = EXTRACT_16BITS(p + 2);			p += 4;			/* p points to tag_value */			if (tag_len) {				unsigned isascii = 0, isgarbage = 0;				const u_char *v = p;				char tag_str[MAXTAGPRINT];				unsigned tag_str_len = 0;				/* TODO print UTF-8 decoded text */				TCHECK2(*p, tag_len);				for (v = p; v < p + tag_len && tag_str_len < MAXTAGPRINT-1; v++)					if (*v >= 32 && *v < 127) {						tag_str[tag_str_len++] = *v;						isascii++;					} else {						tag_str[tag_str_len++] = '.';						isgarbage++;					}				tag_str[tag_str_len] = 0;				if (isascii > isgarbage) {					printf(" [%s \"%*.*s\"]",					       tok2str(pppoetag2str, "TAG-0x%x", tag_type),					       (int)tag_str_len,					       (int)tag_str_len,					       tag_str);				} else {					/* Print hex, not fast to abuse printf but this doesn't get used much */					printf(" [%s 0x", tok2str(pppoetag2str, "TAG-0x%x", tag_type));					for (v=p; v<p+tag_len; v++) {						printf("%02X", *v);					}					printf("]");				}							} 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));	}trunc:	printf("[|pppoe]");	return (PPPOE_HDRLEN);}