freebsd-dev/contrib/tcpdump/print-pppoe.c

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/*
* 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 1.3 1999/12/15 00:23:06 fenner Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#if __STDC__
struct mbuf;
struct rtentry;
#endif
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "ppp.h"
#include "ethertype.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+sizeof(struct ether_header);
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 = -1, tag_len;
const u_char *p = pppoe_payload;
/* loop invariant:
p points to next tag,
tag_type is previous tag or -1 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 {
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));
}
return;
}