/* * 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 */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/tcpdump/print-pppoe.c,v 1.27 2003-11-16 09:36:33 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #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 80 u_int pppoe_if_print(const struct pcap_pkthdr *h, register const u_char *p) { return (pppoe_print(p, h->len)); } 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 && snapend-pppoe_payload+14 > 64) { /* (small packets are probably just padded up to the ethernet minimum of 64 bytes) */ printf(" [length %d (%d extra bytes)]", pppoe_length, snapend - pppoe_payload - pppoe_length); #if RESPECT_PAYLOAD_LENGTH snapend = pppoe_payload+pppoe_length; #else /* Actual PPPoE implementations appear to ignore the payload length and use the full ethernet frame anyways */ pppoe_length = snapend-pppoe_payload; #endif } 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) { 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 */ 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