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tcpdump/print-rip.c
Francois-Xavier Le Bail e2982e7f6f Update ND_PRINT() as a variadic macro
2018-01-07 13:36:41 +01:00

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9.1 KiB
C
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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.
*/
/* \summary: Routing Information Protocol (RIP) printer */
/* specification: RFC 1058, RFC 2453 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include <stdio.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "af.h"
static const char tstr[] = "[|rip]";
struct rip {
nd_uint8_t rip_cmd; /* request/response */
nd_uint8_t rip_vers; /* protocol version # */
nd_byte 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 {
nd_uint16_t rip_family;
nd_uint16_t rip_tag;
nd_uint32_t rip_dest;
nd_uint32_t rip_dest_mask;
nd_uint32_t rip_router;
nd_uint32_t rip_metric; /* cost of route */
};
static void
rip_entry_print_v1(netdissect_options *ndo,
const struct rip_netinfo *ni)
{
u_short family;
/* RFC 1058 */
family = EXTRACT_BE_U_2(ni->rip_family);
if (family != BSD_AFNUM_INET && family != 0) {
ND_PRINT("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
print_unknown_data(ndo, (const uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN);
return;
}
if (EXTRACT_BE_U_2(ni->rip_tag) ||
EXTRACT_BE_U_4(ni->rip_dest_mask) ||
EXTRACT_BE_U_4(ni->rip_router)) {
/* MBZ fields not zero */
print_unknown_data(ndo, (const uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN);
return;
}
if (family == 0) {
ND_PRINT("\n\t AFI 0, %s, metric: %u",
ipaddr_string(ndo, &ni->rip_dest),
EXTRACT_BE_U_4(ni->rip_metric));
return;
} /* BSD_AFNUM_INET */
ND_PRINT("\n\t %s, metric: %u",
ipaddr_string(ndo, &ni->rip_dest),
EXTRACT_BE_U_4(ni->rip_metric));
}
static unsigned
rip_entry_print_v2(netdissect_options *ndo,
const struct rip_netinfo *ni, const unsigned remaining)
{
u_short family;
family = EXTRACT_BE_U_2(ni->rip_family);
if (family == 0xFFFF) { /* variable-sized authentication structures */
uint16_t auth_type = EXTRACT_BE_U_2(ni->rip_tag);
if (auth_type == 2) {
const u_char *p = (const u_char *)&ni->rip_dest;
u_int i = 0;
ND_PRINT("\n\t Simple Text Authentication data: ");
for (; i < RIP_AUTHLEN; p++, i++)
ND_PRINT("%c",
ND_ISPRINT(EXTRACT_U_1(p)) ? EXTRACT_U_1(p) : '.');
} else if (auth_type == 3) {
ND_PRINT("\n\t Auth header:");
ND_PRINT(" Packet Len %u,", EXTRACT_BE_U_2((const uint8_t *)ni + 4));
ND_PRINT(" Key-ID %u,", EXTRACT_U_1((const uint8_t *)ni + 6));
ND_PRINT(" Auth Data Len %u,", EXTRACT_U_1((const uint8_t *)ni + 7));
ND_PRINT(" SeqNo %u,", EXTRACT_BE_U_4(ni->rip_dest_mask));
ND_PRINT(" MBZ %u,", EXTRACT_BE_U_4(ni->rip_router));
ND_PRINT(" MBZ %u", EXTRACT_BE_U_4(ni->rip_metric));
} else if (auth_type == 1) {
ND_PRINT("\n\t Auth trailer:");
print_unknown_data(ndo, (const uint8_t *)&ni->rip_dest, "\n\t ", remaining);
return remaining; /* AT spans till the packet end */
} else {
ND_PRINT("\n\t Unknown (%u) Authentication data:",
EXTRACT_BE_U_2(ni->rip_tag));
print_unknown_data(ndo, (const uint8_t *)&ni->rip_dest, "\n\t ", remaining);
}
} else if (family != BSD_AFNUM_INET && family != 0) {
ND_PRINT("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
print_unknown_data(ndo, (const uint8_t *)&ni->rip_tag, "\n\t ", RIP_ROUTELEN-2);
} else { /* BSD_AFNUM_INET or AFI 0 */
ND_PRINT("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
tok2str(bsd_af_values, "%u", family),
ipaddr_string(ndo, &ni->rip_dest),
mask2plen(EXTRACT_BE_U_4(ni->rip_dest_mask)),
EXTRACT_BE_U_2(ni->rip_tag),
EXTRACT_BE_U_4(ni->rip_metric));
if (EXTRACT_BE_U_4(ni->rip_router))
ND_PRINT("%s", ipaddr_string(ndo, &ni->rip_router));
else
ND_PRINT("self");
}
return sizeof (*ni);
}
void
rip_print(netdissect_options *ndo,
const u_char *dat, u_int length)
{
const struct rip *rp;
uint8_t vers, cmd;
const struct rip_netinfo *ni;
u_int i, j;
if (ndo->ndo_snapend < dat) {
ND_PRINT(" %s", tstr);
return;
}
i = ndo->ndo_snapend - dat;
if (i > length)
i = length;
if (i < sizeof(*rp)) {
ND_PRINT(" %s", tstr);
return;
}
i -= sizeof(*rp);
rp = (const struct rip *)dat;
vers = EXTRACT_U_1(rp->rip_vers);
ND_PRINT("%sRIPv%u",
(ndo->ndo_vflag >= 1) ? "\n\t" : "",
vers);
switch (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(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length);
break;
default:
/* dump version and lets see if we know the commands name*/
cmd = EXTRACT_U_1(rp->rip_cmd);
ND_PRINT(", %s, length: %u",
tok2str(rip_cmd_values,
"unknown command (%u)",
cmd),
length);
if (ndo->ndo_vflag < 1)
return;
switch (cmd) {
case RIPCMD_REQUEST:
case RIPCMD_RESPONSE:
j = length / sizeof(*ni);
ND_PRINT(", routes: %u%s", j, vers == 2 ? " or less" : "");
ni = (const struct rip_netinfo *)(rp + 1);
for (; i >= sizeof(*ni); ++ni) {
if (vers == 1)
{
rip_entry_print_v1(ndo, ni);
i -= sizeof(*ni);
}
else if (vers == 2)
i -= rip_entry_print_v2(ndo, ni, i);
else
break;
}
if (i)
ND_PRINT("%s", tstr);
break;
case RIPCMD_TRACEOFF:
case RIPCMD_POLL:
case RIPCMD_POLLENTRY:
break;
case RIPCMD_TRACEON:
/* fall through */
default:
if (ndo->ndo_vflag <= 1) {
if(!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
return;
}
break;
}
/* do we want to see an additionally hexdump ? */
if (ndo->ndo_vflag> 1) {
if(!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
return;
}
}
}
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