223 lines
6.1 KiB
C
223 lines
6.1 KiB
C
/*
|
|
* 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 1.12 2000/10/09 02:59:40 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_print(register const u_char *bp, u_int length)
|
|
{
|
|
register const struct ether_header *eh;
|
|
register u_short pppoe_ver, pppoe_type, pppoe_code, pppoe_sessionid, pppoe_length;
|
|
const u_char *pppoe_packet, *pppoe_payload;
|
|
|
|
eh = (struct ether_header *)packetp;
|
|
pppoe_packet = packetp+ETHER_HDRLEN;
|
|
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+6;
|
|
|
|
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) {
|
|
/*
|
|
printf(" [length %d (%d extra bytes)]", pppoe_length, snapend-pppoe_payload-pppoe_length);
|
|
{
|
|
const u_char *x = pppoe_payload+pppoe_length;
|
|
default_print(x, snapend - x);
|
|
}
|
|
*/
|
|
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;
|
|
|
|
for (v=p; v<p+tag_len; v++)
|
|
if (*v >= 127 || *v < 32) {
|
|
isascii = 0;
|
|
break;
|
|
}
|
|
|
|
/* TODO print UTF8 decoded text */
|
|
if (isascii)
|
|
printf(" [%s \"%*.*s\"]",
|
|
tok2str(pppoetag2str, "TAG-0x%x", tag_type),
|
|
tag_len < 80 ? tag_len : 80,
|
|
tag_len < 80 ? tag_len : 80,
|
|
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 {
|
|
#if 0
|
|
/* We now make use of ppp_print() instead, because it has more
|
|
comprehensive support for PPP. It also gives us a consistent
|
|
output with other protocols like L2TP. */
|
|
u_short ptype;
|
|
if (pppoe_payload[0] & 0x1) {
|
|
ptype = pppoe_payload[0];
|
|
pppoe_payload +=1;
|
|
pppoe_length -=1;
|
|
} else if (pppoe_payload[1] & 0x1) {
|
|
ptype = ntohs(*(u_short *)pppoe_payload);
|
|
pppoe_payload +=2;
|
|
pppoe_length -=2;
|
|
} else {
|
|
printf(" Invalid PPP protocol ID: %x %x", pppoe_payload[0],pppoe_payload[1]);
|
|
return;
|
|
}
|
|
printf(" ");
|
|
if (ptype == PPP_IP)
|
|
ip_print(pppoe_payload, pppoe_length);
|
|
else if (ptype == PPP_LCP)
|
|
lcp_print(pppoe_payload, pppoe_length);
|
|
else
|
|
printf("%s ", tok2str(ppptype2str, "proto-0x%x", ptype));
|
|
#endif
|
|
printf(" ");
|
|
ppp_print(pppoe_payload, pppoe_length);
|
|
}
|
|
return;
|
|
}
|