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/*
* 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.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.49 2001/05/10 05:30:22 fenner Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
struct rip {
u_char rip_cmd; /* request/response */
u_char rip_vers; /* protocol version # */
u_short rip_zero2; /* 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 */
#define RIP_AUTHLEN 16
struct rip_netinfo {
u_short rip_family;
u_short 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_printblk(const u_char *cp, const u_char *ep)
{
for (; cp < ep; cp += 2)
printf(" %04x", EXTRACT_16BITS(cp));
return;
}
static void
rip_entry_print_v1(register int vers, register const struct rip_netinfo *ni)
{
register u_short family;
/* RFC 1058 */
family = EXTRACT_16BITS(&ni->rip_family);
if (family != AF_INET) {
printf(" [family %d:", family);
rip_printblk((u_char *)&ni->rip_tag,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
return;
}
if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
/* MBZ fields not zero */
printf(" [");
rip_printblk((u_char *)&ni->rip_family,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
return;
}
printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
EXTRACT_32BITS(&ni->rip_metric));
}
static void
rip_entry_print_v2(register int vers, register const struct rip_netinfo *ni)
{
register u_char *p;
register u_short family;
u_char buf[RIP_AUTHLEN];
/* RFC 1723 */
family = EXTRACT_16BITS(&ni->rip_family);
if (family == 0xFFFF) {
if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
memcpy(buf, &ni->rip_dest, sizeof(buf));
buf[sizeof(buf)-1] = '\0';
for (p = buf; *p; p++) {
if (!isprint(*p))
break;
}
if (!*p) {
printf(" [password %s]", buf);
} else {
printf(" [password: ");
rip_printblk((u_char *)&ni->rip_dest,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
}
} else {
printf(" [auth %d:",
EXTRACT_16BITS(&ni->rip_tag));
rip_printblk((u_char *)&ni->rip_dest,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
}
} else if (family != AF_INET) {
printf(" [family %d:", family);
rip_printblk((u_char *)&ni->rip_tag,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
return;
} else { /* AF_INET */
printf(" {%s", ipaddr_string(&ni->rip_dest));
if (ni->rip_dest_mask)
printf("/%s", ipaddr_string(&ni->rip_dest_mask));
if (ni->rip_router)
printf("->%s", ipaddr_string(&ni->rip_router));
if (ni->rip_tag)
printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
}
}
void
rip_print(const u_char *dat, u_int length)
{
register const struct rip *rp;
register const struct rip_netinfo *ni;
register int i, j, trunc;
i = min(length, snapend - dat) - sizeof(*rp);
if (i < 0) {
printf(" [|rip]");
return;
}
rp = (struct rip *)dat;
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 first few words of
* the packet, in hex.
*/
printf(" RIPv0: ");
ni = (struct rip_netinfo *)(rp + 1);
rip_printblk((u_char *)&ni->rip_family,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
break;
default:
switch (rp->rip_cmd) {
case RIPCMD_REQUEST:
printf(" RIPv%d-req %d", rp->rip_vers, length);
break;
case RIPCMD_RESPONSE:
j = length / sizeof(*ni);
if (j * sizeof(*ni) != length - 4)
printf(" RIPv%d-resp [items %d] [%d]:",
rp->rip_vers, j, length);
else
printf(" RIPv%d-resp [items %d]:",
rp->rip_vers, j);
trunc = (i / sizeof(*ni)) != j;
ni = (struct rip_netinfo *)(rp + 1);
for (; (i -= sizeof(*ni)) >= 0; ++ni) {
if (rp->rip_vers == 1)
rip_entry_print_v1(rp->rip_vers, ni);
else
rip_entry_print_v2(rp->rip_vers, ni);
}
if (trunc)
printf("[|rip]");
break;
case RIPCMD_TRACEON:
printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
(void)fn_print((const u_char *)(rp + 1), snapend);
fputs("\"", stdout);
break;
case RIPCMD_TRACEOFF:
printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
break;
case RIPCMD_POLL:
printf(" RIPv%d-poll %d", rp->rip_vers, length);
break;
case RIPCMD_POLLENTRY:
printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
break;
default:
printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
length);
break;
}
}
}
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