1/* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * Original code by Greg Stark <gsstark@mit.edu> 22 */ 23 24#ifndef lint 25static const char rcsid[] _U_ = 26"@(#) $Header: /tcpdump/master/tcpdump/print-pppoe.c,v 1.31 2005-04-26 19:48:38 guy Exp $ (LBL)"; 27#endif 28 29#ifdef HAVE_CONFIG_H 30#include "config.h" 31#endif 32 33#include <tcpdump-stdinc.h> 34 35#include <stdio.h> 36#include <string.h> 37 38#include "interface.h" 39#include "addrtoname.h" 40#include "ppp.h" 41#include "ethertype.h" 42#include "ether.h" 43#include "extract.h" /* must come after interface.h */ 44 45/* Codes */ 46enum { 47 PPPOE_PADI = 0x09, 48 PPPOE_PADO = 0x07, 49 PPPOE_PADR = 0x19, 50 PPPOE_PADS = 0x65, 51 PPPOE_PADT = 0xa7 52}; 53 54static const struct tok pppoecode2str[] = { 55 { PPPOE_PADI, "PADI" }, 56 { PPPOE_PADO, "PADO" }, 57 { PPPOE_PADR, "PADR" }, 58 { PPPOE_PADS, "PADS" }, 59 { PPPOE_PADT, "PADT" }, 60 { 0, "" }, /* PPP Data */ 61 { 0, NULL } 62}; 63 64/* Tags */ 65enum { 66 PPPOE_EOL = 0, 67 PPPOE_SERVICE_NAME = 0x0101, 68 PPPOE_AC_NAME = 0x0102, 69 PPPOE_HOST_UNIQ = 0x0103, 70 PPPOE_AC_COOKIE = 0x0104, 71 PPPOE_VENDOR = 0x0105, 72 PPPOE_RELAY_SID = 0x0110, 73 PPPOE_MAX_PAYLOAD = 0x0120, 74 PPPOE_SERVICE_NAME_ERROR = 0x0201, 75 PPPOE_AC_SYSTEM_ERROR = 0x0202, 76 PPPOE_GENERIC_ERROR = 0x0203 77}; 78 79static const struct tok pppoetag2str[] = { 80 { PPPOE_EOL, "EOL" }, 81 { PPPOE_SERVICE_NAME, "Service-Name" }, 82 { PPPOE_AC_NAME, "AC-Name" }, 83 { PPPOE_HOST_UNIQ, "Host-Uniq" }, 84 { PPPOE_AC_COOKIE, "AC-Cookie" }, 85 { PPPOE_VENDOR, "Vendor-Specific" }, 86 { PPPOE_RELAY_SID, "Relay-Session-ID" }, 87 { PPPOE_MAX_PAYLOAD, "PPP-Max-Payload" }, 88 { PPPOE_SERVICE_NAME_ERROR, "Service-Name-Error" }, 89 { PPPOE_AC_SYSTEM_ERROR, "AC-System-Error" }, 90 { PPPOE_GENERIC_ERROR, "Generic-Error" }, 91 { 0, NULL } 92}; 93 94#define PPPOE_HDRLEN 6 95#define MAXTAGPRINT 80 96 97u_int 98pppoe_if_print(const struct pcap_pkthdr *h, register const u_char *p) 99{ 100 return (pppoe_print(p, h->len)); 101} 102 103u_int 104pppoe_print(register const u_char *bp, u_int length) 105{ 106 u_int16_t pppoe_ver, pppoe_type, pppoe_code, pppoe_sessionid; 107 u_int pppoe_length; 108 const u_char *pppoe_packet, *pppoe_payload; 109 110 if (length < PPPOE_HDRLEN) { 111 (void)printf("truncated-pppoe %u", length); 112 return (length); 113 } 114 length -= PPPOE_HDRLEN; 115 pppoe_packet = bp; 116 TCHECK2(*pppoe_packet, PPPOE_HDRLEN); 117 pppoe_ver = (pppoe_packet[0] & 0xF0) >> 4; 118 pppoe_type = (pppoe_packet[0] & 0x0F); 119 pppoe_code = pppoe_packet[1]; 120 pppoe_sessionid = EXTRACT_16BITS(pppoe_packet + 2); 121 pppoe_length = EXTRACT_16BITS(pppoe_packet + 4); 122 pppoe_payload = pppoe_packet + PPPOE_HDRLEN; 123 124 if (pppoe_ver != 1) { 125 printf(" [ver %d]",pppoe_ver); 126 } 127 if (pppoe_type != 1) { 128 printf(" [type %d]",pppoe_type); 129 } 130 131 printf("PPPoE %s", tok2str(pppoecode2str, "PAD-%x", pppoe_code)); 132 if (pppoe_code == PPPOE_PADI && pppoe_length > 1484 - PPPOE_HDRLEN) { 133 printf(" [len %u!]",pppoe_length); 134 } 135 if (pppoe_length > length) { 136 printf(" [len %u > %u!]", pppoe_length, length); 137 pppoe_length = length; 138 } 139 if (pppoe_sessionid) { 140 printf(" [ses 0x%x]", pppoe_sessionid); 141 } 142 143 if (pppoe_code) { 144 /* PPP session packets don't contain tags */ 145 u_short tag_type = 0xffff, tag_len; 146 const u_char *p = pppoe_payload; 147 148 /* 149 * loop invariant: 150 * p points to current tag, 151 * tag_type is previous tag or 0xffff for first iteration 152 */ 153 while (tag_type && p < pppoe_payload + pppoe_length) { 154 TCHECK2(*p, 4); 155 tag_type = EXTRACT_16BITS(p); 156 tag_len = EXTRACT_16BITS(p + 2); 157 p += 4; 158 /* p points to tag_value */ 159 160 if (tag_len) { 161 unsigned isascii = 0, isgarbage = 0; 162 const u_char *v; 163 char tag_str[MAXTAGPRINT]; 164 unsigned tag_str_len = 0; 165 166 /* TODO print UTF-8 decoded text */ 167 TCHECK2(*p, tag_len); 168 for (v = p; v < p + tag_len && tag_str_len < MAXTAGPRINT-1; v++) 169 if (*v >= 32 && *v < 127) { 170 tag_str[tag_str_len++] = *v; 171 isascii++; 172 } else { 173 tag_str[tag_str_len++] = '.'; 174 isgarbage++; 175 } 176 tag_str[tag_str_len] = 0; 177 178 if (isascii > isgarbage) { 179 printf(" [%s \"%*.*s\"]", 180 tok2str(pppoetag2str, "TAG-0x%x", tag_type), 181 (int)tag_str_len, 182 (int)tag_str_len, 183 tag_str); 184 } else { 185 /* Print hex, not fast to abuse printf but this doesn't get used much */ 186 printf(" [%s 0x", tok2str(pppoetag2str, "TAG-0x%x", tag_type)); 187 for (v=p; v<p+tag_len; v++) { 188 printf("%02X", *v); 189 } 190 printf("]"); 191 } 192 193 194 } else 195 printf(" [%s]", tok2str(pppoetag2str, 196 "TAG-0x%x", tag_type)); 197 198 p += tag_len; 199 /* p points to next tag */ 200 } 201 return (0); 202 } else { 203 /* PPPoE data */ 204 printf(" "); 205 return (PPPOE_HDRLEN + ppp_print(pppoe_payload, pppoe_length)); 206 } 207 208trunc: 209 printf("[|pppoe]"); 210 return (PPPOE_HDRLEN); 211} 212