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273 lines
9.2 KiB
273 lines
9.2 KiB
/* |
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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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/* \summary: Routing Information Protocol (RIP) printer */ |
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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 <netdissect-stdinc.h> |
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#include <stdio.h> |
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#include "netdissect.h" |
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#include "addrtoname.h" |
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#include "extract.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, (const 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, (const 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 const u_char *p = (const 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((const uint8_t *)ni + 4))); |
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ND_PRINT((ndo, " Key-ID %u,", *((const uint8_t *)ni + 6))); |
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ND_PRINT((ndo, " Auth Data Len %u,", *((const 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, (const 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, (const 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, (const 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 = (const 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, (const 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 = (const 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, (const 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, (const 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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