David van Moolenbroek b636d99d91 Import NetBSD tcpdump(8)
For now, printing of Sun RPC requests is disabled because we do not
yet have the RPC header files.  This should affect basically noone,
as we do not have any RPC-based programs yet, for the same reason.

Change-Id: Ie7818faaaacdc104d8b2c37a68866b4ce18247d6
2017-03-21 22:00:21 +00:00

168 lines
4.4 KiB
C

/*
* Copyright (c) 1998-2007 The TCPDUMP project
*
* 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, and (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.
* 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.
*
* UNIDIRECTIONAL LINK DETECTION (UDLD) as per
* http://www.ietf.org/internet-drafts/draft-foschiano-udld-02.txt
*
* Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include "interface.h"
#include "extract.h"
#define UDLD_HEADER_LEN 4
#define UDLD_DEVICE_ID_TLV 0x0001
#define UDLD_PORT_ID_TLV 0x0002
#define UDLD_ECHO_TLV 0x0003
#define UDLD_MESSAGE_INTERVAL_TLV 0x0004
#define UDLD_TIMEOUT_INTERVAL_TLV 0x0005
#define UDLD_DEVICE_NAME_TLV 0x0006
#define UDLD_SEQ_NUMBER_TLV 0x0007
static const struct tok udld_tlv_values[] = {
{ UDLD_DEVICE_ID_TLV, "Device-ID TLV"},
{ UDLD_PORT_ID_TLV, "Port-ID TLV"},
{ UDLD_ECHO_TLV, "Echo TLV"},
{ UDLD_MESSAGE_INTERVAL_TLV, "Message Interval TLV"},
{ UDLD_TIMEOUT_INTERVAL_TLV, "Timeout Interval TLV"},
{ UDLD_DEVICE_NAME_TLV, "Device Name TLV"},
{ UDLD_SEQ_NUMBER_TLV,"Sequence Number TLV"},
{ 0, NULL}
};
static const struct tok udld_code_values[] = {
{ 0x00, "Reserved"},
{ 0x01, "Probe message"},
{ 0x02, "Echo message"},
{ 0x03, "Flush message"},
{ 0, NULL}
};
static const struct tok udld_flags_values[] = {
{ 0x00, "RT"},
{ 0x01, "RSY"},
{ 0, NULL}
};
/*
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Ver | Opcode | Flags | Checksum |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | List of TLVs (variable length list) |
* | ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
#define UDLD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
#define UDLD_EXTRACT_OPCODE(x) ((x)&0x1f)
void
udld_print (netdissect_options *ndo, const u_char *pptr, u_int length)
{
int code, type, len;
const u_char *tptr;
if (length < UDLD_HEADER_LEN)
goto trunc;
tptr = pptr;
ND_TCHECK2(*tptr, UDLD_HEADER_LEN);
code = UDLD_EXTRACT_OPCODE(*tptr);
ND_PRINT((ndo, "UDLDv%u, Code %s (%x), Flags [%s] (0x%02x), length %u",
UDLD_EXTRACT_VERSION(*tptr),
tok2str(udld_code_values, "Reserved", code),
code,
bittok2str(udld_flags_values, "none", *(tptr+1)),
*(tptr+1),
length));
/*
* In non-verbose mode, just print version and opcode type
*/
if (ndo->ndo_vflag < 1) {
return;
}
ND_PRINT((ndo, "\n\tChecksum 0x%04x (unverified)", EXTRACT_16BITS(tptr+2)));
tptr += UDLD_HEADER_LEN;
while (tptr < (pptr+length)) {
ND_TCHECK2(*tptr, 4);
type = EXTRACT_16BITS(tptr);
len = EXTRACT_16BITS(tptr+2);
len -= 4;
tptr += 4;
/* infinite loop check */
if (type == 0 || len == 0) {
return;
}
ND_PRINT((ndo, "\n\t%s (0x%04x) TLV, length %u",
tok2str(udld_tlv_values, "Unknown", type),
type, len));
switch (type) {
case UDLD_DEVICE_ID_TLV:
case UDLD_PORT_ID_TLV:
case UDLD_ECHO_TLV:
case UDLD_DEVICE_NAME_TLV:
ND_PRINT((ndo, ", %s", tptr));
break;
case UDLD_MESSAGE_INTERVAL_TLV:
case UDLD_TIMEOUT_INTERVAL_TLV:
ND_PRINT((ndo, ", %us", (*tptr)));
break;
case UDLD_SEQ_NUMBER_TLV:
ND_PRINT((ndo, ", %u", EXTRACT_32BITS(tptr)));
break;
default:
break;
}
tptr += len;
}
return;
trunc:
ND_PRINT((ndo, "[|udld]"));
}
/*
* Local Variables:
* c-style: whitesmith
* c-basic-offset: 4
* End:
*/