mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-23 18:14:29 +08:00
94a3708f00
Builds using Autotools or CMake generate config.h, thus remove the '#ifdef HAVE_CONFIG_H'/'#endif'. Remove also the 'add_definitions(-DHAVE_CONFIG_H)' in CMakeLists.txt.
383 lines
9.9 KiB
C
383 lines
9.9 KiB
C
/*
|
|
* Copyright (c) 2013 The TCPDUMP project
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
|
|
* COPYRIGHT HOLDER 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.
|
|
*/
|
|
|
|
/* \summary: Ad Hoc Configuration Protocol (AHCP) printer */
|
|
|
|
/* Based on draft-chroboczek-ahcp-00 and source code of ahcpd-0.53 */
|
|
|
|
#include <config.h>
|
|
|
|
#include "netdissect-stdinc.h"
|
|
|
|
#define ND_LONGJMP_FROM_TCHECK
|
|
#include "netdissect.h"
|
|
#include "extract.h"
|
|
#include "addrtoname.h"
|
|
|
|
|
|
#define AHCP_MAGIC_NUMBER 43
|
|
#define AHCP_VERSION_1 1
|
|
#define AHCP1_HEADER_FIX_LEN 24
|
|
#define AHCP1_BODY_MIN_LEN 4
|
|
|
|
#define AHCP1_MSG_DISCOVER 0
|
|
#define AHCP1_MSG_OFFER 1
|
|
#define AHCP1_MSG_REQUEST 2
|
|
#define AHCP1_MSG_ACK 3
|
|
#define AHCP1_MSG_NACK 4
|
|
#define AHCP1_MSG_RELEASE 5
|
|
|
|
static const struct tok ahcp1_msg_str[] = {
|
|
{ AHCP1_MSG_DISCOVER, "Discover" },
|
|
{ AHCP1_MSG_OFFER, "Offer" },
|
|
{ AHCP1_MSG_REQUEST, "Request" },
|
|
{ AHCP1_MSG_ACK, "Ack" },
|
|
{ AHCP1_MSG_NACK, "Nack" },
|
|
{ AHCP1_MSG_RELEASE, "Release" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define AHCP1_OPT_PAD 0
|
|
#define AHCP1_OPT_MANDATORY 1
|
|
#define AHCP1_OPT_ORIGIN_TIME 2
|
|
#define AHCP1_OPT_EXPIRES 3
|
|
#define AHCP1_OPT_MY_IPV6_ADDRESS 4
|
|
#define AHCP1_OPT_MY_IPV4_ADDRESS 5
|
|
#define AHCP1_OPT_IPV6_PREFIX 6
|
|
#define AHCP1_OPT_IPV4_PREFIX 7
|
|
#define AHCP1_OPT_IPV6_ADDRESS 8
|
|
#define AHCP1_OPT_IPV4_ADDRESS 9
|
|
#define AHCP1_OPT_IPV6_PREFIX_DELEGATION 10
|
|
#define AHCP1_OPT_IPV4_PREFIX_DELEGATION 11
|
|
#define AHCP1_OPT_NAME_SERVER 12
|
|
#define AHCP1_OPT_NTP_SERVER 13
|
|
#define AHCP1_OPT_MAX 13
|
|
|
|
static const struct tok ahcp1_opt_str[] = {
|
|
{ AHCP1_OPT_PAD, "Pad" },
|
|
{ AHCP1_OPT_MANDATORY, "Mandatory" },
|
|
{ AHCP1_OPT_ORIGIN_TIME, "Origin Time" },
|
|
{ AHCP1_OPT_EXPIRES, "Expires" },
|
|
{ AHCP1_OPT_MY_IPV6_ADDRESS, "My-IPv6-Address" },
|
|
{ AHCP1_OPT_MY_IPV4_ADDRESS, "My-IPv4-Address" },
|
|
{ AHCP1_OPT_IPV6_PREFIX, "IPv6 Prefix" },
|
|
{ AHCP1_OPT_IPV4_PREFIX, "IPv4 Prefix" },
|
|
{ AHCP1_OPT_IPV6_ADDRESS, "IPv6 Address" },
|
|
{ AHCP1_OPT_IPV4_ADDRESS, "IPv4 Address" },
|
|
{ AHCP1_OPT_IPV6_PREFIX_DELEGATION, "IPv6 Prefix Delegation" },
|
|
{ AHCP1_OPT_IPV4_PREFIX_DELEGATION, "IPv4 Prefix Delegation" },
|
|
{ AHCP1_OPT_NAME_SERVER, "Name Server" },
|
|
{ AHCP1_OPT_NTP_SERVER, "NTP Server" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
ahcp_time_print(netdissect_options *ndo,
|
|
const u_char *cp, uint8_t len)
|
|
{
|
|
time_t t;
|
|
char buf[sizeof("-yyyyyyyyyy-mm-dd hh:mm:ss UTC")];
|
|
|
|
if (len != 4)
|
|
goto invalid;
|
|
t = GET_BE_U_4(cp);
|
|
ND_PRINT(": %s",
|
|
nd_format_time(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S UTC",
|
|
gmtime(&t)));
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|
|
static void
|
|
ahcp_seconds_print(netdissect_options *ndo,
|
|
const u_char *cp, uint8_t len)
|
|
{
|
|
if (len != 4)
|
|
goto invalid;
|
|
ND_PRINT(": %us", GET_BE_U_4(cp));
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|
|
static void
|
|
ahcp_ipv6_addresses_print(netdissect_options *ndo,
|
|
const u_char *cp, uint8_t len)
|
|
{
|
|
const char *sep = ": ";
|
|
|
|
while (len) {
|
|
if (len < 16)
|
|
goto invalid;
|
|
ND_PRINT("%s%s", sep, GET_IP6ADDR_STRING(cp));
|
|
cp += 16;
|
|
len -= 16;
|
|
sep = ", ";
|
|
}
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|
|
static void
|
|
ahcp_ipv4_addresses_print(netdissect_options *ndo,
|
|
const u_char *cp, uint8_t len)
|
|
{
|
|
const char *sep = ": ";
|
|
|
|
while (len) {
|
|
if (len < 4)
|
|
goto invalid;
|
|
ND_PRINT("%s%s", sep, GET_IPADDR_STRING(cp));
|
|
cp += 4;
|
|
len -= 4;
|
|
sep = ", ";
|
|
}
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|
|
static void
|
|
ahcp_ipv6_prefixes_print(netdissect_options *ndo,
|
|
const u_char *cp, uint8_t len)
|
|
{
|
|
const char *sep = ": ";
|
|
|
|
while (len) {
|
|
if (len < 17)
|
|
goto invalid;
|
|
ND_PRINT("%s%s/%u", sep, GET_IP6ADDR_STRING(cp), GET_U_1(cp + 16));
|
|
cp += 17;
|
|
len -= 17;
|
|
sep = ", ";
|
|
}
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|
|
static void
|
|
ahcp_ipv4_prefixes_print(netdissect_options *ndo,
|
|
const u_char *cp, uint8_t len)
|
|
{
|
|
const char *sep = ": ";
|
|
|
|
while (len) {
|
|
if (len < 5)
|
|
goto invalid;
|
|
ND_PRINT("%s%s/%u", sep, GET_IPADDR_STRING(cp), GET_U_1(cp + 4));
|
|
cp += 5;
|
|
len -= 5;
|
|
sep = ", ";
|
|
}
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|
|
static void
|
|
(* const data_decoders[AHCP1_OPT_MAX + 1])(netdissect_options *, const u_char *, uint8_t) = {
|
|
/* [AHCP1_OPT_PAD] = */ NULL,
|
|
/* [AHCP1_OPT_MANDATORY] = */ NULL,
|
|
/* [AHCP1_OPT_ORIGIN_TIME] = */ ahcp_time_print,
|
|
/* [AHCP1_OPT_EXPIRES] = */ ahcp_seconds_print,
|
|
/* [AHCP1_OPT_MY_IPV6_ADDRESS] = */ ahcp_ipv6_addresses_print,
|
|
/* [AHCP1_OPT_MY_IPV4_ADDRESS] = */ ahcp_ipv4_addresses_print,
|
|
/* [AHCP1_OPT_IPV6_PREFIX] = */ ahcp_ipv6_prefixes_print,
|
|
/* [AHCP1_OPT_IPV4_PREFIX] = */ NULL,
|
|
/* [AHCP1_OPT_IPV6_ADDRESS] = */ ahcp_ipv6_addresses_print,
|
|
/* [AHCP1_OPT_IPV4_ADDRESS] = */ ahcp_ipv4_addresses_print,
|
|
/* [AHCP1_OPT_IPV6_PREFIX_DELEGATION] = */ ahcp_ipv6_prefixes_print,
|
|
/* [AHCP1_OPT_IPV4_PREFIX_DELEGATION] = */ ahcp_ipv4_prefixes_print,
|
|
/* [AHCP1_OPT_NAME_SERVER] = */ ahcp_ipv6_addresses_print,
|
|
/* [AHCP1_OPT_NTP_SERVER] = */ ahcp_ipv6_addresses_print,
|
|
};
|
|
|
|
static void
|
|
ahcp1_options_print(netdissect_options *ndo,
|
|
const u_char *cp, uint16_t len)
|
|
{
|
|
while (len) {
|
|
uint8_t option_no, option_len;
|
|
|
|
/* Option no */
|
|
option_no = GET_U_1(cp);
|
|
cp += 1;
|
|
len -= 1;
|
|
ND_PRINT("\n\t %s", tok2str(ahcp1_opt_str, "Unknown-%u", option_no));
|
|
if (option_no == AHCP1_OPT_PAD || option_no == AHCP1_OPT_MANDATORY)
|
|
continue;
|
|
/* Length */
|
|
if (!len)
|
|
goto invalid;
|
|
option_len = GET_U_1(cp);
|
|
cp += 1;
|
|
len -= 1;
|
|
if (option_len > len)
|
|
goto invalid;
|
|
/* Value */
|
|
if (option_no <= AHCP1_OPT_MAX && data_decoders[option_no] != NULL) {
|
|
data_decoders[option_no](ndo, cp, option_len);
|
|
} else {
|
|
ND_PRINT(" (Length %u)", option_len);
|
|
ND_TCHECK_LEN(cp, option_len);
|
|
}
|
|
cp += option_len;
|
|
len -= option_len;
|
|
}
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|
|
|
|
static void
|
|
ahcp1_body_print(netdissect_options *ndo,
|
|
const u_char *cp, u_int len)
|
|
{
|
|
uint8_t type, mbz;
|
|
uint16_t body_len;
|
|
|
|
if (len < AHCP1_BODY_MIN_LEN)
|
|
goto invalid;
|
|
/* Type */
|
|
type = GET_U_1(cp);
|
|
cp += 1;
|
|
len -= 1;
|
|
/* MBZ */
|
|
mbz = GET_U_1(cp);
|
|
cp += 1;
|
|
len -= 1;
|
|
/* Length */
|
|
body_len = GET_BE_U_2(cp);
|
|
cp += 2;
|
|
len -= 2;
|
|
|
|
if (ndo->ndo_vflag) {
|
|
ND_PRINT("\n\t%s", tok2str(ahcp1_msg_str, "Unknown-%u", type));
|
|
if (mbz != 0)
|
|
ND_PRINT(", MBZ %u", mbz);
|
|
ND_PRINT(", Length %u", body_len);
|
|
}
|
|
if (body_len > len)
|
|
goto invalid;
|
|
|
|
/* Options */
|
|
/* Here use "body_len", not "len" (ignore any extra data). */
|
|
if (ndo->ndo_vflag >= 2)
|
|
ahcp1_options_print(ndo, cp, body_len);
|
|
else
|
|
ND_TCHECK_LEN(cp, body_len);
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
|
|
}
|
|
|
|
void
|
|
ahcp_print(netdissect_options *ndo,
|
|
const u_char *cp, u_int len)
|
|
{
|
|
uint8_t version;
|
|
|
|
ndo->ndo_protocol = "ahcp";
|
|
nd_print_protocol_caps(ndo);
|
|
if (len < 2)
|
|
goto invalid;
|
|
/* Magic */
|
|
if (GET_U_1(cp) != AHCP_MAGIC_NUMBER)
|
|
goto invalid;
|
|
cp += 1;
|
|
len -= 1;
|
|
/* Version */
|
|
version = GET_U_1(cp);
|
|
cp += 1;
|
|
len -= 1;
|
|
switch (version) {
|
|
case AHCP_VERSION_1: {
|
|
ND_PRINT(" Version 1");
|
|
if (len < AHCP1_HEADER_FIX_LEN - 2)
|
|
goto invalid;
|
|
if (!ndo->ndo_vflag) {
|
|
ND_TCHECK_LEN(cp, AHCP1_HEADER_FIX_LEN - 2);
|
|
cp += AHCP1_HEADER_FIX_LEN - 2;
|
|
len -= AHCP1_HEADER_FIX_LEN - 2;
|
|
} else {
|
|
/* Hopcount */
|
|
ND_PRINT("\n\tHopcount %u", GET_U_1(cp));
|
|
cp += 1;
|
|
len -= 1;
|
|
/* Original Hopcount */
|
|
ND_PRINT(", Original Hopcount %u", GET_U_1(cp));
|
|
cp += 1;
|
|
len -= 1;
|
|
/* Nonce */
|
|
ND_PRINT(", Nonce 0x%08x", GET_BE_U_4(cp));
|
|
cp += 4;
|
|
len -= 4;
|
|
/* Source Id */
|
|
ND_PRINT(", Source Id %s", GET_LINKADDR_STRING(cp, LINKADDR_OTHER, 8));
|
|
cp += 8;
|
|
len -= 8;
|
|
/* Destination Id */
|
|
ND_PRINT(", Destination Id %s", GET_LINKADDR_STRING(cp, LINKADDR_OTHER, 8));
|
|
cp += 8;
|
|
len -= 8;
|
|
}
|
|
/* Body */
|
|
ahcp1_body_print(ndo, cp, len);
|
|
break;
|
|
}
|
|
default:
|
|
ND_PRINT(" Version %u (unknown)", version);
|
|
ND_TCHECK_LEN(cp, len);
|
|
break;
|
|
}
|
|
return;
|
|
|
|
invalid:
|
|
nd_print_invalid(ndo);
|
|
ND_TCHECK_LEN(cp, len);
|
|
}
|