273 lines
9.1 KiB
C
273 lines
9.1 KiB
C
/*
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* Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#include "af.h"
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static const char tstr[] = "[|rip]";
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struct rip {
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uint8_t rip_cmd; /* request/response */
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uint8_t rip_vers; /* protocol version # */
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uint8_t unused[2]; /* unused */
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};
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#define RIPCMD_REQUEST 1 /* want info */
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#define RIPCMD_RESPONSE 2 /* responding to request */
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#define RIPCMD_TRACEON 3 /* turn tracing on */
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#define RIPCMD_TRACEOFF 4 /* turn it off */
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#define RIPCMD_POLL 5 /* want info from everybody */
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#define RIPCMD_POLLENTRY 6 /* poll for entry */
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static const struct tok rip_cmd_values[] = {
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{ RIPCMD_REQUEST, "Request" },
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{ RIPCMD_RESPONSE, "Response" },
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{ RIPCMD_TRACEON, "Trace on" },
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{ RIPCMD_TRACEOFF, "Trace off" },
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{ RIPCMD_POLL, "Poll" },
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{ RIPCMD_POLLENTRY, "Poll Entry" },
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{ 0, NULL}
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};
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#define RIP_AUTHLEN 16
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#define RIP_ROUTELEN 20
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/*
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* rfc 1723
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*
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* 0 1 2 3 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Command (1) | Version (1) | unused |
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* +---------------+---------------+-------------------------------+
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* | Address Family Identifier (2) | Route Tag (2) |
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* +-------------------------------+-------------------------------+
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* | IP Address (4) |
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* +---------------------------------------------------------------+
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* | Subnet Mask (4) |
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* +---------------------------------------------------------------+
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* | Next Hop (4) |
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* +---------------------------------------------------------------+
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* | Metric (4) |
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* +---------------------------------------------------------------+
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*
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*/
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struct rip_netinfo {
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uint16_t rip_family;
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uint16_t rip_tag;
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uint32_t rip_dest;
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uint32_t rip_dest_mask;
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uint32_t rip_router;
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uint32_t rip_metric; /* cost of route */
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};
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static void
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rip_entry_print_v1(netdissect_options *ndo,
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register const struct rip_netinfo *ni)
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{
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register u_short family;
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/* RFC 1058 */
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family = EXTRACT_16BITS(&ni->rip_family);
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if (family != BSD_AFNUM_INET && family != 0) {
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ND_PRINT((ndo, "\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family)));
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print_unknown_data(ndo, (uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN);
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return;
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}
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if (EXTRACT_16BITS(&ni->rip_tag) ||
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EXTRACT_32BITS(&ni->rip_dest_mask) ||
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EXTRACT_32BITS(&ni->rip_router)) {
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/* MBZ fields not zero */
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print_unknown_data(ndo, (uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN);
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return;
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}
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if (family == 0) {
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ND_PRINT((ndo, "\n\t AFI 0, %s, metric: %u",
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ipaddr_string(ndo, &ni->rip_dest),
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EXTRACT_32BITS(&ni->rip_metric)));
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return;
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} /* BSD_AFNUM_INET */
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ND_PRINT((ndo, "\n\t %s, metric: %u",
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ipaddr_string(ndo, &ni->rip_dest),
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EXTRACT_32BITS(&ni->rip_metric)));
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}
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static unsigned
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rip_entry_print_v2(netdissect_options *ndo,
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register const struct rip_netinfo *ni, const unsigned remaining)
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{
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register u_short family;
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family = EXTRACT_16BITS(&ni->rip_family);
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if (family == 0xFFFF) { /* variable-sized authentication structures */
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uint16_t auth_type = EXTRACT_16BITS(&ni->rip_tag);
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if (auth_type == 2) {
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register u_char *p = (u_char *)&ni->rip_dest;
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u_int i = 0;
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ND_PRINT((ndo, "\n\t Simple Text Authentication data: "));
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for (; i < RIP_AUTHLEN; p++, i++)
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ND_PRINT((ndo, "%c", ND_ISPRINT(*p) ? *p : '.'));
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} else if (auth_type == 3) {
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ND_PRINT((ndo, "\n\t Auth header:"));
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ND_PRINT((ndo, " Packet Len %u,", EXTRACT_16BITS((uint8_t *)ni + 4)));
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ND_PRINT((ndo, " Key-ID %u,", *((uint8_t *)ni + 6)));
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ND_PRINT((ndo, " Auth Data Len %u,", *((uint8_t *)ni + 7)));
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ND_PRINT((ndo, " SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask)));
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ND_PRINT((ndo, " MBZ %u,", EXTRACT_32BITS(&ni->rip_router)));
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ND_PRINT((ndo, " MBZ %u", EXTRACT_32BITS(&ni->rip_metric)));
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} else if (auth_type == 1) {
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ND_PRINT((ndo, "\n\t Auth trailer:"));
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print_unknown_data(ndo, (uint8_t *)&ni->rip_dest, "\n\t ", remaining);
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return remaining; /* AT spans till the packet end */
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} else {
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ND_PRINT((ndo, "\n\t Unknown (%u) Authentication data:",
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EXTRACT_16BITS(&ni->rip_tag)));
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print_unknown_data(ndo, (uint8_t *)&ni->rip_dest, "\n\t ", remaining);
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}
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} else if (family != BSD_AFNUM_INET && family != 0) {
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ND_PRINT((ndo, "\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)));
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print_unknown_data(ndo, (uint8_t *)&ni->rip_tag, "\n\t ", RIP_ROUTELEN-2);
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} else { /* BSD_AFNUM_INET or AFI 0 */
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ND_PRINT((ndo, "\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
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tok2str(bsd_af_values, "%u", family),
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ipaddr_string(ndo, &ni->rip_dest),
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mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
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EXTRACT_16BITS(&ni->rip_tag),
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EXTRACT_32BITS(&ni->rip_metric)));
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if (EXTRACT_32BITS(&ni->rip_router))
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ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ni->rip_router)));
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else
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ND_PRINT((ndo, "self"));
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}
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return sizeof (*ni);
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}
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void
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rip_print(netdissect_options *ndo,
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const u_char *dat, u_int length)
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{
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register const struct rip *rp;
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register const struct rip_netinfo *ni;
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register u_int i, j;
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if (ndo->ndo_snapend < dat) {
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ND_PRINT((ndo, " %s", tstr));
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return;
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}
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i = ndo->ndo_snapend - dat;
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if (i > length)
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i = length;
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if (i < sizeof(*rp)) {
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ND_PRINT((ndo, " %s", tstr));
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return;
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}
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i -= sizeof(*rp);
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rp = (struct rip *)dat;
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ND_PRINT((ndo, "%sRIPv%u",
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(ndo->ndo_vflag >= 1) ? "\n\t" : "",
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rp->rip_vers));
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switch (rp->rip_vers) {
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case 0:
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/*
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* RFC 1058.
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*
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* XXX - RFC 1058 says
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*
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* 0 Datagrams whose version number is zero are to be ignored.
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* These are from a previous version of the protocol, whose
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* packet format was machine-specific.
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*
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* so perhaps we should just dump the packet, in hex.
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*/
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print_unknown_data(ndo, (uint8_t *)&rp->rip_cmd, "\n\t", length);
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break;
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default:
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/* dump version and lets see if we know the commands name*/
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ND_PRINT((ndo, ", %s, length: %u",
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tok2str(rip_cmd_values,
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"unknown command (%u)",
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rp->rip_cmd),
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length));
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if (ndo->ndo_vflag < 1)
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return;
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switch (rp->rip_cmd) {
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case RIPCMD_REQUEST:
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case RIPCMD_RESPONSE:
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j = length / sizeof(*ni);
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ND_PRINT((ndo, ", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : ""));
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ni = (struct rip_netinfo *)(rp + 1);
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for (; i >= sizeof(*ni); ++ni) {
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if (rp->rip_vers == 1)
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{
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rip_entry_print_v1(ndo, ni);
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i -= sizeof(*ni);
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}
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else if (rp->rip_vers == 2)
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i -= rip_entry_print_v2(ndo, ni, i);
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else
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break;
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}
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if (i)
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ND_PRINT((ndo, "%s", tstr));
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break;
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case RIPCMD_TRACEOFF:
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case RIPCMD_POLL:
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case RIPCMD_POLLENTRY:
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break;
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case RIPCMD_TRACEON:
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/* fall through */
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default:
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if (ndo->ndo_vflag <= 1) {
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if(!print_unknown_data(ndo, (uint8_t *)rp, "\n\t", length))
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return;
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}
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break;
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}
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/* do we want to see an additionally hexdump ? */
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if (ndo->ndo_vflag> 1) {
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if(!print_unknown_data(ndo, (uint8_t *)rp, "\n\t", length))
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return;
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}
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}
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}
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