| /* |
| * 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 lint |
| static 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_MAX_PAYLOAD = 0x0120, |
| 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_MAX_PAYLOAD, "PPP-Max-Payload" }, |
| { 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_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); |
| } |