| /* |
| * 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 */ |
| |
| #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 { |
| uint8_t rip_cmd; /* request/response */ |
| uint8_t rip_vers; /* protocol version # */ |
| uint8_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 { |
| uint16_t rip_family; |
| uint16_t rip_tag; |
| uint32_t rip_dest; |
| uint32_t rip_dest_mask; |
| uint32_t rip_router; |
| uint32_t rip_metric; /* cost of route */ |
| }; |
| |
| static void |
| rip_entry_print_v1(netdissect_options *ndo, |
| register const struct rip_netinfo *ni) |
| { |
| register u_short family; |
| |
| /* RFC 1058 */ |
| family = EXTRACT_16BITS(&ni->rip_family); |
| if (family != BSD_AFNUM_INET && family != 0) { |
| ND_PRINT((ndo, "\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_16BITS(&ni->rip_tag) || |
| EXTRACT_32BITS(&ni->rip_dest_mask) || |
| EXTRACT_32BITS(&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((ndo, "\n\t AFI 0, %s, metric: %u", |
| ipaddr_string(ndo, &ni->rip_dest), |
| EXTRACT_32BITS(&ni->rip_metric))); |
| return; |
| } /* BSD_AFNUM_INET */ |
| ND_PRINT((ndo, "\n\t %s, metric: %u", |
| ipaddr_string(ndo, &ni->rip_dest), |
| EXTRACT_32BITS(&ni->rip_metric))); |
| } |
| |
| static unsigned |
| rip_entry_print_v2(netdissect_options *ndo, |
| register const struct rip_netinfo *ni, const unsigned remaining) |
| { |
| register u_short family; |
| |
| family = EXTRACT_16BITS(&ni->rip_family); |
| if (family == 0xFFFF) { /* variable-sized authentication structures */ |
| uint16_t auth_type = EXTRACT_16BITS(&ni->rip_tag); |
| if (auth_type == 2) { |
| register const u_char *p = (const u_char *)&ni->rip_dest; |
| u_int i = 0; |
| ND_PRINT((ndo, "\n\t Simple Text Authentication data: ")); |
| for (; i < RIP_AUTHLEN; p++, i++) |
| ND_PRINT((ndo, "%c", ND_ISPRINT(*p) ? *p : '.')); |
| } else if (auth_type == 3) { |
| ND_PRINT((ndo, "\n\t Auth header:")); |
| ND_PRINT((ndo, " Packet Len %u,", EXTRACT_16BITS((const uint8_t *)ni + 4))); |
| ND_PRINT((ndo, " Key-ID %u,", *((const uint8_t *)ni + 6))); |
| ND_PRINT((ndo, " Auth Data Len %u,", *((const uint8_t *)ni + 7))); |
| ND_PRINT((ndo, " SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask))); |
| ND_PRINT((ndo, " MBZ %u,", EXTRACT_32BITS(&ni->rip_router))); |
| ND_PRINT((ndo, " MBZ %u", EXTRACT_32BITS(&ni->rip_metric))); |
| } else if (auth_type == 1) { |
| ND_PRINT((ndo, "\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((ndo, "\n\t Unknown (%u) Authentication data:", |
| EXTRACT_16BITS(&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((ndo, "\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((ndo, "\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_32BITS(&ni->rip_dest_mask)), |
| EXTRACT_16BITS(&ni->rip_tag), |
| EXTRACT_32BITS(&ni->rip_metric))); |
| if (EXTRACT_32BITS(&ni->rip_router)) |
| ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ni->rip_router))); |
| else |
| ND_PRINT((ndo, "self")); |
| } |
| return sizeof (*ni); |
| } |
| |
| void |
| rip_print(netdissect_options *ndo, |
| const u_char *dat, u_int length) |
| { |
| register const struct rip *rp; |
| register const struct rip_netinfo *ni; |
| register u_int i, j; |
| |
| if (ndo->ndo_snapend < dat) { |
| ND_PRINT((ndo, " %s", tstr)); |
| return; |
| } |
| i = ndo->ndo_snapend - dat; |
| if (i > length) |
| i = length; |
| if (i < sizeof(*rp)) { |
| ND_PRINT((ndo, " %s", tstr)); |
| return; |
| } |
| i -= sizeof(*rp); |
| |
| rp = (const struct rip *)dat; |
| |
| ND_PRINT((ndo, "%sRIPv%u", |
| (ndo->ndo_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(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length); |
| break; |
| default: |
| /* dump version and lets see if we know the commands name*/ |
| ND_PRINT((ndo, ", %s, length: %u", |
| tok2str(rip_cmd_values, |
| "unknown command (%u)", |
| rp->rip_cmd), |
| length)); |
| |
| if (ndo->ndo_vflag < 1) |
| return; |
| |
| switch (rp->rip_cmd) { |
| case RIPCMD_REQUEST: |
| case RIPCMD_RESPONSE: |
| j = length / sizeof(*ni); |
| ND_PRINT((ndo, ", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : "")); |
| ni = (const struct rip_netinfo *)(rp + 1); |
| for (; i >= sizeof(*ni); ++ni) { |
| if (rp->rip_vers == 1) |
| { |
| rip_entry_print_v1(ndo, ni); |
| i -= sizeof(*ni); |
| } |
| else if (rp->rip_vers == 2) |
| i -= rip_entry_print_v2(ndo, ni, i); |
| else |
| break; |
| } |
| if (i) |
| ND_PRINT((ndo, "%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; |
| } |
| } |
| } |
| |
| |
