| /* |
| * 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[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.57 2003/11/16 09:36:34 guy Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "interface.h" |
| #include "addrtoname.h" |
| #include "extract.h" /* must come after interface.h */ |
| |
| struct rip { |
| u_int8_t rip_cmd; /* request/response */ |
| u_int8_t rip_vers; /* protocol version # */ |
| u_int8_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 { |
| u_int16_t rip_family; |
| u_int16_t 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_entry_print_v1(register const struct rip_netinfo *ni) |
| { |
| register u_short family; |
| |
| /* RFC 1058 */ |
| family = EXTRACT_16BITS(&ni->rip_family); |
| if (family != AF_INET) { |
| printf("\n\t AFI: %u:", family); |
| print_unknown_data((u_int8_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((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); |
| return; |
| } /* AF_INET */ |
| printf("\n\t %s, metric: %u", |
| ipaddr_string(&ni->rip_dest), |
| EXTRACT_32BITS(&ni->rip_metric)); |
| } |
| |
| static void |
| rip_entry_print_v2(register const struct rip_netinfo *ni) |
| { |
| register u_char *p; |
| register u_short family; |
| u_char buf[RIP_AUTHLEN]; |
| |
| family = EXTRACT_16BITS(&ni->rip_family); |
| if (family == 0xFFFF) { /* 16 bytes authentication ? */ |
| if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */ |
| memcpy(buf, &ni->rip_dest, sizeof(buf)); |
| buf[sizeof(buf)-1] = '\0'; |
| for (p = buf; *p; p++) { |
| if (!isprint(*p)) |
| break; |
| } |
| printf("\n\t Simple Text Authentication data: %s", buf); |
| } else { |
| printf("\n\t Unknown (%u) Authentication data:", |
| EXTRACT_16BITS(&ni->rip_tag)); |
| print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",RIP_AUTHLEN); |
| } |
| } else if (family != AF_INET) { |
| printf("\n\t AFI: %u", family); |
| print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2); |
| return; |
| } else { /* AF_INET */ |
| printf("\n\t AFI: IPv4: %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", |
| ipaddr_string(&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)) |
| printf("%s", ipaddr_string(&ni->rip_router)); |
| else |
| printf("self"); |
| } |
| } |
| |
| void |
| rip_print(const u_char *dat, u_int length) |
| { |
| register const struct rip *rp; |
| register const struct rip_netinfo *ni; |
| register u_int i, j; |
| register int trunc; |
| |
| if (snapend < dat) { |
| printf(" [|rip]"); |
| return; |
| } |
| i = snapend - dat; |
| if (i > length) |
| i = length; |
| if (i < sizeof(*rp)) { |
| printf(" [|rip]"); |
| return; |
| } |
| i -= sizeof(*rp); |
| |
| rp = (struct rip *)dat; |
| |
| printf("%sRIPv%u", |
| (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((u_int8_t *)&rp->rip_cmd,"\n\t",length); |
| break; |
| default: |
| /* dump version and lets see if we know the commands name*/ |
| printf(", %s, length: %u", |
| tok2str(rip_cmd_values, |
| "unknown command (%u)", |
| rp->rip_cmd), |
| length); |
| |
| if (vflag < 1) |
| return; |
| |
| switch (rp->rip_cmd) { |
| case RIPCMD_RESPONSE: |
| j = length / sizeof(*ni); |
| printf(", routes: %u",j); |
| trunc = (i / sizeof(*ni)) != j; |
| ni = (struct rip_netinfo *)(rp + 1); |
| for (; i >= sizeof(*ni); ++ni) { |
| if (rp->rip_vers == 1) |
| rip_entry_print_v1(ni); |
| else if (rp->rip_vers == 2) |
| rip_entry_print_v2(ni); |
| else |
| break; |
| i -= sizeof(*ni); |
| } |
| if (trunc) |
| printf("[|rip]"); |
| break; |
| |
| case RIPCMD_REQUEST: |
| case RIPCMD_TRACEOFF: |
| case RIPCMD_POLL: |
| case RIPCMD_POLLENTRY: |
| break; |
| |
| case RIPCMD_TRACEON: |
| /* fall through */ |
| default: |
| if (vflag <= 1) { |
| if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) |
| return; |
| } |
| break; |
| } |
| /* do we want to see an additionally hexdump ? */ |
| if (vflag> 1) { |
| if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) |
| return; |
| } |
| } |
| } |
| |
| |
