262 lines
8.1 KiB
C
262 lines
8.1 KiB
C
/* $NetBSD: print-rip.c,v 1.3 2004/09/27 23:04:25 dyoung Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static const char rcsid[] _U_ =
|
|
"@(#) Header: /tcpdump/master/tcpdump/print-rip.c,v 1.55.2.2 2003/11/16 08:51:41 guy Exp (LBL)";
|
|
#else
|
|
__RCSID("$NetBSD: print-rip.c,v 1.3 2004/09/27 23:04:25 dyoung Exp $");
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <tcpdump-stdinc.h>
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "interface.h"
|
|
#include "addrtoname.h"
|
|
#include "extract.h" /* must come after interface.h */
|
|
|
|
struct rip {
|
|
u_int8_t rip_cmd; /* request/response */
|
|
u_int8_t rip_vers; /* protocol version # */
|
|
u_int8_t unused[2]; /* unused */
|
|
};
|
|
|
|
#define RIPCMD_REQUEST 1 /* want info */
|
|
#define RIPCMD_RESPONSE 2 /* responding to request */
|
|
#define RIPCMD_TRACEON 3 /* turn tracing on */
|
|
#define RIPCMD_TRACEOFF 4 /* turn it off */
|
|
#define RIPCMD_POLL 5 /* want info from everybody */
|
|
#define RIPCMD_POLLENTRY 6 /* poll for entry */
|
|
|
|
static const struct tok rip_cmd_values[] = {
|
|
{ RIPCMD_REQUEST, "Request" },
|
|
{ RIPCMD_RESPONSE, "Response" },
|
|
{ RIPCMD_TRACEON, "Trace on" },
|
|
{ RIPCMD_TRACEOFF, "Trace off" },
|
|
{ RIPCMD_POLL, "Poll" },
|
|
{ RIPCMD_POLLENTRY, "Poll Entry" },
|
|
{ 0, NULL}
|
|
};
|
|
|
|
#define RIP_AUTHLEN 16
|
|
#define RIP_ROUTELEN 20
|
|
|
|
/*
|
|
* rfc 1723
|
|
*
|
|
* 0 1 2 3 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
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | Command (1) | Version (1) | unused |
|
|
* +---------------+---------------+-------------------------------+
|
|
* | Address Family Identifier (2) | Route Tag (2) |
|
|
* +-------------------------------+-------------------------------+
|
|
* | IP Address (4) |
|
|
* +---------------------------------------------------------------+
|
|
* | Subnet Mask (4) |
|
|
* +---------------------------------------------------------------+
|
|
* | Next Hop (4) |
|
|
* +---------------------------------------------------------------+
|
|
* | Metric (4) |
|
|
* +---------------------------------------------------------------+
|
|
*
|
|
*/
|
|
|
|
struct rip_netinfo {
|
|
u_int16_t rip_family;
|
|
u_int16_t rip_tag;
|
|
u_int32_t rip_dest;
|
|
u_int32_t rip_dest_mask;
|
|
u_int32_t rip_router;
|
|
u_int32_t rip_metric; /* cost of route */
|
|
};
|
|
|
|
static void
|
|
rip_entry_print_v1(register const struct rip_netinfo *ni)
|
|
{
|
|
register u_short family;
|
|
|
|
/* RFC 1058 */
|
|
family = EXTRACT_16BITS(&ni->rip_family);
|
|
if (family != AF_INET) {
|
|
printf("\n\t AFI: %u:", family);
|
|
print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN);
|
|
return;
|
|
}
|
|
if (EXTRACT_16BITS(&ni->rip_tag) ||
|
|
EXTRACT_32BITS(&ni->rip_dest_mask) ||
|
|
EXTRACT_32BITS(&ni->rip_router)) {
|
|
/* MBZ fields not zero */
|
|
print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN);
|
|
return;
|
|
} /* AF_INET */
|
|
printf("\n\t %s, metric: %u",
|
|
ipaddr_string(&ni->rip_dest),
|
|
EXTRACT_32BITS(&ni->rip_metric));
|
|
}
|
|
|
|
static void
|
|
rip_entry_print_v2(register const struct rip_netinfo *ni)
|
|
{
|
|
register u_char *p;
|
|
register u_short family;
|
|
u_char buf[RIP_AUTHLEN];
|
|
|
|
family = EXTRACT_16BITS(&ni->rip_family);
|
|
if (family == 0xFFFF) { /* 16 bytes authentication ? */
|
|
if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */
|
|
memcpy(buf, &ni->rip_dest, sizeof(buf));
|
|
buf[sizeof(buf)-1] = '\0';
|
|
for (p = buf; *p; p++) {
|
|
if (!isprint(*p))
|
|
break;
|
|
}
|
|
printf("\n\t Simple Text Authentication data: %s", buf);
|
|
} else {
|
|
printf("\n\t Unknown (%u) Authentication data:",
|
|
EXTRACT_16BITS(&ni->rip_tag));
|
|
print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",RIP_AUTHLEN);
|
|
}
|
|
} else if (family != AF_INET) {
|
|
printf("\n\t AFI: %u", family);
|
|
print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2);
|
|
return;
|
|
} else { /* AF_INET */
|
|
printf("\n\t AFI: IPv4: %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
|
|
ipaddr_string(&ni->rip_dest),
|
|
mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
|
|
EXTRACT_16BITS(&ni->rip_tag),
|
|
EXTRACT_32BITS(&ni->rip_metric));
|
|
if (EXTRACT_32BITS(&ni->rip_router))
|
|
printf("%s", ipaddr_string(&ni->rip_router));
|
|
else
|
|
printf("self");
|
|
}
|
|
}
|
|
|
|
void
|
|
rip_print(const u_char *dat, u_int length)
|
|
{
|
|
register const struct rip *rp;
|
|
register const struct rip_netinfo *ni;
|
|
register u_int i, j;
|
|
register int trunc;
|
|
|
|
if (snapend < dat) {
|
|
printf(" [|rip]");
|
|
return;
|
|
}
|
|
i = snapend - dat;
|
|
if (i > length)
|
|
i = length;
|
|
if (i < sizeof(*rp)) {
|
|
printf(" [|rip]");
|
|
return;
|
|
}
|
|
i -= sizeof(*rp);
|
|
|
|
rp = (struct rip *)dat;
|
|
|
|
printf("%sRIPv%u",
|
|
(vflag >= 1) ? "\n\t" : "",
|
|
rp->rip_vers);
|
|
|
|
switch (rp->rip_vers) {
|
|
case 0:
|
|
/*
|
|
* RFC 1058.
|
|
*
|
|
* XXX - RFC 1058 says
|
|
*
|
|
* 0 Datagrams whose version number is zero are to be ignored.
|
|
* These are from a previous version of the protocol, whose
|
|
* packet format was machine-specific.
|
|
*
|
|
* so perhaps we should just dump the packet, in hex.
|
|
*/
|
|
print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length);
|
|
break;
|
|
default:
|
|
/* dump version and lets see if we know the commands name*/
|
|
printf(", %s, length: %u",
|
|
tok2str(rip_cmd_values,
|
|
"unknown command (%u)",
|
|
rp->rip_cmd),
|
|
length);
|
|
|
|
if (vflag < 1)
|
|
return;
|
|
|
|
switch (rp->rip_cmd) {
|
|
case RIPCMD_RESPONSE:
|
|
j = length / sizeof(*ni);
|
|
printf(", routes: %u",j);
|
|
trunc = (i / sizeof(*ni)) != j;
|
|
ni = (struct rip_netinfo *)(rp + 1);
|
|
for (; i >= sizeof(*ni); ++ni) {
|
|
if (rp->rip_vers == 1)
|
|
rip_entry_print_v1(ni);
|
|
else if (rp->rip_vers == 2)
|
|
rip_entry_print_v2(ni);
|
|
else
|
|
break;
|
|
i -= sizeof(*ni);
|
|
}
|
|
if (trunc)
|
|
printf("[|rip]");
|
|
break;
|
|
|
|
case RIPCMD_REQUEST:
|
|
case RIPCMD_TRACEOFF:
|
|
case RIPCMD_POLL:
|
|
case RIPCMD_POLLENTRY:
|
|
break;
|
|
|
|
case RIPCMD_TRACEON:
|
|
/* fall through */
|
|
default:
|
|
if (vflag <= 1) {
|
|
if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
/* do we want to see an additionally hexdump ? */
|
|
if (vflag> 1) {
|
|
if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
|