| /* |
| * 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. |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-pppoe.c,v 1.15 2001-07-05 18:54:17 guy Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <sys/param.h> |
| #include <sys/time.h> |
| #include <sys/socket.h> |
| |
| #include <netinet/in.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 |
| |
| void |
| pppoe_if_print(u_char *user, const struct pcap_pkthdr *h, |
| register const u_char *p) |
| { |
| register u_int length = h->len; |
| register u_int caplen = h->caplen; |
| |
| ++infodelay; |
| ts_print(&h->ts); |
| |
| /* |
| * Some printers want to get back at the link level addresses, |
| * and/or check that they're not walking off the end of the packet. |
| * Rather than pass them all the way down, we set these globals. |
| */ |
| packetp = p; |
| snapend = p + caplen; |
| |
| pppoe_print(p, length); |
| putchar('\n'); |
| --infodelay; |
| if (infoprint) |
| info(0); |
| } |
| |
| void |
| 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_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; |
| } |
| |
| 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) { |
| #if 0 |
| const u_char *x = pppoe_payload + pppoe_length; |
| printf(" [length %d (%d extra bytes)]", |
| pppoe_length, snapend - pppoe_payload - pppoe_length); |
| default_print(x, snapend - x); |
| #endif |
| snapend = pppoe_payload+pppoe_length; |
| } |
| |
| 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) { |
| int isascii = 1; |
| const u_char *v = p; |
| u_short l; |
| |
| for (v = p; v < p + tag_len; v++) |
| if (*v >= 127 || *v < 32) { |
| isascii = 0; |
| break; |
| } |
| |
| /* TODO print UTF8 decoded text */ |
| if (isascii) { |
| l = (tag_len < 80 ? tag_len : 80); |
| printf(" [%s \"%*.*s\"]", |
| tok2str(pppoetag2str, "TAG-0x%x", tag_type), |
| l, l, p); |
| } else |
| printf(" [%s UTF8]", |
| tok2str(pppoetag2str, "TAG-0x%x", tag_type)); |
| } else |
| printf(" [%s]", tok2str(pppoetag2str, |
| "TAG-0x%x", tag_type)); |
| |
| p += tag_len; |
| /* p points to next tag */ |
| } |
| } else { |
| printf(" "); |
| ppp_print(pppoe_payload, pppoe_length); |
| } |
| return; |
| } |