mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-11 19:03:39 +08:00
938becee00
Use EXTRACT_16BITS() rather than a hand-rolled macro to extract big-endian 16-bit quantities from the packet. When processing the message, check against the body length *and* the UDP payload length, as well as against the raw frame length.
415 lines
12 KiB
C
415 lines
12 KiB
C
/*
|
|
* Copyright (c) 2007-2011 Grégoire Henry, Juliusz Chroboczek
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <tcpdump-stdinc.h>
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "addrtoname.h"
|
|
#include "interface.h"
|
|
#include "extract.h"
|
|
|
|
static void babel_print_v2(const u_char *cp, u_int length);
|
|
|
|
void
|
|
babel_print(const u_char *cp, u_int length) {
|
|
printf("babel");
|
|
|
|
TCHECK2(*cp, 4);
|
|
|
|
if(cp[0] != 42) {
|
|
printf(" malformed header");
|
|
return;
|
|
} else {
|
|
printf(" %d", cp[1]);
|
|
}
|
|
|
|
switch(cp[1]) {
|
|
case 2:
|
|
babel_print_v2(cp,length);
|
|
break;
|
|
default:
|
|
printf(" unknown version");
|
|
break;
|
|
}
|
|
|
|
return;
|
|
|
|
trunc:
|
|
printf(" [|babel]");
|
|
return;
|
|
}
|
|
|
|
#define MESSAGE_PAD1 0
|
|
#define MESSAGE_PADN 1
|
|
#define MESSAGE_ACK_REQ 2
|
|
#define MESSAGE_ACK 3
|
|
#define MESSAGE_HELLO 4
|
|
#define MESSAGE_IHU 5
|
|
#define MESSAGE_ROUTER_ID 6
|
|
#define MESSAGE_NH 7
|
|
#define MESSAGE_UPDATE 8
|
|
#define MESSAGE_REQUEST 9
|
|
#define MESSAGE_MH_REQUEST 10
|
|
|
|
static const char *
|
|
format_id(const u_char *id)
|
|
{
|
|
static char buf[25];
|
|
snprintf(buf, 25, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
|
|
id[0], id[1], id[2], id[3], id[4], id[5], id[6], id[7]);
|
|
buf[24] = '\0';
|
|
return buf;
|
|
}
|
|
|
|
static const unsigned char v4prefix[16] =
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
|
|
|
|
static const char *
|
|
format_prefix(const u_char *prefix, unsigned char plen)
|
|
{
|
|
static char buf[50];
|
|
if(plen >= 96 && memcmp(prefix, v4prefix, 12) == 0)
|
|
snprintf(buf, 50, "%s/%u", ipaddr_string(prefix + 12), plen - 96);
|
|
else
|
|
snprintf(buf, 50, "%s/%u", ip6addr_string(prefix), plen);
|
|
buf[49] = '\0';
|
|
return buf;
|
|
}
|
|
|
|
static const char *
|
|
format_address(const u_char *prefix)
|
|
{
|
|
if(memcmp(prefix, v4prefix, 12) == 0)
|
|
return ipaddr_string(prefix + 12);
|
|
else
|
|
return ip6addr_string(prefix);
|
|
}
|
|
|
|
static int
|
|
network_prefix(int ae, int plen, unsigned int omitted,
|
|
const unsigned char *p, const unsigned char *dp,
|
|
unsigned int len, unsigned char *p_r)
|
|
{
|
|
unsigned pb;
|
|
unsigned char prefix[16];
|
|
|
|
if(plen >= 0)
|
|
pb = (plen + 7) / 8;
|
|
else if(ae == 1)
|
|
pb = 4;
|
|
else
|
|
pb = 16;
|
|
|
|
if(pb > 16)
|
|
return -1;
|
|
|
|
memset(prefix, 0, 16);
|
|
|
|
switch(ae) {
|
|
case 0: break;
|
|
case 1:
|
|
if(omitted > 4 || pb > 4 || (pb > omitted && len < pb - omitted))
|
|
return -1;
|
|
memcpy(prefix, v4prefix, 12);
|
|
if(omitted) {
|
|
if (dp == NULL) return -1;
|
|
memcpy(prefix, dp, 12 + omitted);
|
|
}
|
|
if(pb > omitted) memcpy(prefix + 12 + omitted, p, pb - omitted);
|
|
break;
|
|
case 2:
|
|
if(omitted > 16 || (pb > omitted && len < pb - omitted))
|
|
return -1;
|
|
if(omitted) {
|
|
if (dp == NULL) return -1;
|
|
memcpy(prefix, dp, omitted);
|
|
}
|
|
if(pb > omitted) memcpy(prefix + omitted, p, pb - omitted);
|
|
break;
|
|
case 3:
|
|
if(pb > 8 && len < pb - 8) return -1;
|
|
prefix[0] = 0xfe;
|
|
prefix[1] = 0x80;
|
|
if(pb > 8) memcpy(prefix + 8, p, pb - 8);
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
memcpy(p_r, prefix, 16);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
network_address(int ae, const unsigned char *a, unsigned int len,
|
|
unsigned char *a_r)
|
|
{
|
|
return network_prefix(ae, -1, 0, a, NULL, len, a_r);
|
|
}
|
|
|
|
#define ICHECK(i, l) \
|
|
if ((i) + (l) > bodylen || (i) + (l) > length) goto corrupt;
|
|
|
|
static void
|
|
babel_print_v2(const u_char *cp, u_int length) {
|
|
u_int i;
|
|
u_short bodylen;
|
|
u_char v4_prefix[16] =
|
|
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 };
|
|
u_char v6_prefix[16] = {0};
|
|
|
|
TCHECK2(*cp, 4);
|
|
if (length < 4)
|
|
goto corrupt;
|
|
bodylen = EXTRACT_16BITS(cp + 2);
|
|
printf(" (%u)", bodylen);
|
|
|
|
/* Process the TLVs in the body */
|
|
i = 0;
|
|
while(i < bodylen) {
|
|
const u_char *message;
|
|
u_char type, len;
|
|
|
|
message = cp + 4 + i;
|
|
TCHECK2(*message, 2);
|
|
ICHECK(i, 2);
|
|
type = message[0];
|
|
len = message[1];
|
|
|
|
TCHECK2(*message, 2 + len);
|
|
ICHECK(i, 2 + len);
|
|
|
|
switch(type) {
|
|
case MESSAGE_PAD1: {
|
|
if(!vflag)
|
|
printf(" pad1");
|
|
else
|
|
printf("\n\tPad 1");
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_PADN: {
|
|
if(!vflag)
|
|
printf(" padN");
|
|
else
|
|
printf("\n\tPad %d", len + 2);
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_ACK_REQ: {
|
|
u_short nonce, interval;
|
|
if(!vflag)
|
|
printf(" ack-req");
|
|
else {
|
|
printf("\n\tAcknowledgment Request ");
|
|
if(len < 6) goto corrupt;
|
|
nonce = EXTRACT_16BITS(message + 4);
|
|
interval = EXTRACT_16BITS(message + 6);
|
|
printf("%04x %d", nonce, interval);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_ACK: {
|
|
u_short nonce;
|
|
if(!vflag)
|
|
printf(" ack");
|
|
else {
|
|
printf("\n\tAcknowledgment ");
|
|
if(len < 2) goto corrupt;
|
|
nonce = EXTRACT_16BITS(message + 2);
|
|
printf("%04x", nonce);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_HELLO: {
|
|
u_short seqno, interval;
|
|
if(!vflag)
|
|
printf(" hello");
|
|
else {
|
|
printf("\n\tHello ");
|
|
if(len < 6) goto corrupt;
|
|
seqno = EXTRACT_16BITS(message + 4);
|
|
interval = EXTRACT_16BITS(message + 6);
|
|
printf("seqno %u interval %u", seqno, interval);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_IHU: {
|
|
unsigned short txcost, interval;
|
|
if(!vflag)
|
|
printf(" ihu");
|
|
else {
|
|
u_char address[16];
|
|
int rc;
|
|
printf("\n\tIHU ");
|
|
if(len < 6) goto corrupt;
|
|
txcost = EXTRACT_16BITS(message + 4);
|
|
interval = EXTRACT_16BITS(message + 6);
|
|
rc = network_address(message[2], message + 8, len - 6, address);
|
|
if(rc < 0) { printf("[|babel]"); break; }
|
|
printf("%s txcost %u interval %d",
|
|
format_address(address), txcost, interval);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_ROUTER_ID: {
|
|
if(!vflag)
|
|
printf(" router-id");
|
|
else {
|
|
printf("\n\tRouter Id");
|
|
if(len < 10) goto corrupt;
|
|
printf(" %s", format_id(message + 4));
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_NH: {
|
|
if(!vflag)
|
|
printf(" nh");
|
|
else {
|
|
int rc;
|
|
u_char nh[16];
|
|
printf("\n\tNext Hop");
|
|
if(len < 2) goto corrupt;
|
|
rc = network_address(message[2], message + 4, len - 2, nh);
|
|
if(rc < 0) goto corrupt;
|
|
printf(" %s", format_address(nh));
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_UPDATE: {
|
|
if(!vflag) {
|
|
printf(" update");
|
|
if(len < 1)
|
|
printf("/truncated");
|
|
else
|
|
printf("%s%s%s",
|
|
(message[3] & 0x80) ? "/prefix": "",
|
|
(message[3] & 0x40) ? "/id" : "",
|
|
(message[3] & 0x3f) ? "/unknown" : "");
|
|
} else {
|
|
u_short interval, seqno, metric;
|
|
u_char plen;
|
|
int rc;
|
|
u_char prefix[16];
|
|
printf("\n\tUpdate");
|
|
if(len < 10) goto corrupt;
|
|
plen = message[4] + (message[2] == 1 ? 96 : 0);
|
|
rc = network_prefix(message[2], message[4], message[5],
|
|
message + 12,
|
|
message[2] == 1 ? v4_prefix : v6_prefix,
|
|
len - 10, prefix);
|
|
if(rc < 0) goto corrupt;
|
|
interval = EXTRACT_16BITS(message + 6);
|
|
seqno = EXTRACT_16BITS(message + 8);
|
|
metric = EXTRACT_16BITS(message + 10);
|
|
printf("%s%s%s %s metric %u seqno %u interval %u",
|
|
(message[3] & 0x80) ? "/prefix": "",
|
|
(message[3] & 0x40) ? "/id" : "",
|
|
(message[3] & 0x3f) ? "/unknown" : "",
|
|
format_prefix(prefix, plen),
|
|
metric, seqno, interval);
|
|
if(message[3] & 0x80) {
|
|
if(message[2] == 1)
|
|
memcpy(v4_prefix, prefix, 16);
|
|
else
|
|
memcpy(v6_prefix, prefix, 16);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_REQUEST: {
|
|
if(!vflag)
|
|
printf(" request");
|
|
else {
|
|
int rc;
|
|
u_char prefix[16], plen;
|
|
printf("\n\tRequest ");
|
|
if(len < 2) goto corrupt;
|
|
plen = message[3] + (message[2] == 1 ? 96 : 0);
|
|
rc = network_prefix(message[2], message[3], 0,
|
|
message + 4, NULL, len - 2, prefix);
|
|
if(rc < 0) goto corrupt;
|
|
plen = message[3] + (message[2] == 1 ? 96 : 0);
|
|
printf("for %s",
|
|
message[2] == 0 ? "any" : format_prefix(prefix, plen));
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MESSAGE_MH_REQUEST : {
|
|
if(!vflag)
|
|
printf(" mh-request");
|
|
else {
|
|
int rc;
|
|
u_short seqno;
|
|
u_char prefix[16], plen;
|
|
printf("\n\tMH-Request ");
|
|
if(len < 14) goto corrupt;
|
|
seqno = EXTRACT_16BITS(message + 4);
|
|
rc = network_prefix(message[2], message[3], 0,
|
|
message + 16, NULL, len - 14, prefix);
|
|
if(rc < 0) goto corrupt;
|
|
plen = message[3] + (message[2] == 1 ? 96 : 0);
|
|
printf("(%u hops) for %s seqno %u id %s",
|
|
message[6], format_prefix(prefix, plen),
|
|
seqno, format_id(message + 8));
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
if(!vflag)
|
|
printf(" unknown");
|
|
else
|
|
printf("\n\tUnknown message type %d", type);
|
|
}
|
|
i += len + 2;
|
|
}
|
|
return;
|
|
|
|
trunc:
|
|
printf(" [|babel]");
|
|
return;
|
|
|
|
corrupt:
|
|
printf(" (corrupt)");
|
|
return;
|
|
}
|