1 /* 2 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 22 #include <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: print-rip.c,v 1.5 2014/11/20 03:05:03 christos Exp $"); 25 #endif 26 27 #define NETDISSECT_REWORKED 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include <stdio.h> 35 36 #include "interface.h" 37 #include "addrtoname.h" 38 #include "extract.h" /* must come after interface.h */ 39 40 #include "af.h" 41 42 static const char tstr[] = "[|rip]"; 43 44 struct rip { 45 uint8_t rip_cmd; /* request/response */ 46 uint8_t rip_vers; /* protocol version # */ 47 uint8_t unused[2]; /* unused */ 48 }; 49 50 #define RIPCMD_REQUEST 1 /* want info */ 51 #define RIPCMD_RESPONSE 2 /* responding to request */ 52 #define RIPCMD_TRACEON 3 /* turn tracing on */ 53 #define RIPCMD_TRACEOFF 4 /* turn it off */ 54 #define RIPCMD_POLL 5 /* want info from everybody */ 55 #define RIPCMD_POLLENTRY 6 /* poll for entry */ 56 57 static const struct tok rip_cmd_values[] = { 58 { RIPCMD_REQUEST, "Request" }, 59 { RIPCMD_RESPONSE, "Response" }, 60 { RIPCMD_TRACEON, "Trace on" }, 61 { RIPCMD_TRACEOFF, "Trace off" }, 62 { RIPCMD_POLL, "Poll" }, 63 { RIPCMD_POLLENTRY, "Poll Entry" }, 64 { 0, NULL} 65 }; 66 67 #define RIP_AUTHLEN 16 68 #define RIP_ROUTELEN 20 69 70 /* 71 * rfc 1723 72 * 73 * 0 1 2 3 3 74 * 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 75 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 76 * | Command (1) | Version (1) | unused | 77 * +---------------+---------------+-------------------------------+ 78 * | Address Family Identifier (2) | Route Tag (2) | 79 * +-------------------------------+-------------------------------+ 80 * | IP Address (4) | 81 * +---------------------------------------------------------------+ 82 * | Subnet Mask (4) | 83 * +---------------------------------------------------------------+ 84 * | Next Hop (4) | 85 * +---------------------------------------------------------------+ 86 * | Metric (4) | 87 * +---------------------------------------------------------------+ 88 * 89 */ 90 91 struct rip_netinfo { 92 uint16_t rip_family; 93 uint16_t rip_tag; 94 uint32_t rip_dest; 95 uint32_t rip_dest_mask; 96 uint32_t rip_router; 97 uint32_t rip_metric; /* cost of route */ 98 }; 99 100 static void 101 rip_entry_print_v1(netdissect_options *ndo, 102 register const struct rip_netinfo *ni) 103 { 104 register u_short family; 105 106 /* RFC 1058 */ 107 family = EXTRACT_16BITS(&ni->rip_family); 108 if (family != BSD_AFNUM_INET && family != 0) { 109 ND_PRINT((ndo, "\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family))); 110 print_unknown_data(ndo, (uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN); 111 return; 112 } 113 if (EXTRACT_16BITS(&ni->rip_tag) || 114 EXTRACT_32BITS(&ni->rip_dest_mask) || 115 EXTRACT_32BITS(&ni->rip_router)) { 116 /* MBZ fields not zero */ 117 print_unknown_data(ndo, (uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN); 118 return; 119 } 120 if (family == 0) { 121 ND_PRINT((ndo, "\n\t AFI 0, %s, metric: %u", 122 ipaddr_string(ndo, &ni->rip_dest), 123 EXTRACT_32BITS(&ni->rip_metric))); 124 return; 125 } /* BSD_AFNUM_INET */ 126 ND_PRINT((ndo, "\n\t %s, metric: %u", 127 ipaddr_string(ndo, &ni->rip_dest), 128 EXTRACT_32BITS(&ni->rip_metric))); 129 } 130 131 static unsigned 132 rip_entry_print_v2(netdissect_options *ndo, 133 register const struct rip_netinfo *ni, const unsigned remaining) 134 { 135 register u_short family; 136 137 family = EXTRACT_16BITS(&ni->rip_family); 138 if (family == 0xFFFF) { /* variable-sized authentication structures */ 139 uint16_t auth_type = EXTRACT_16BITS(&ni->rip_tag); 140 if (auth_type == 2) { 141 register u_char *p = (u_char *)&ni->rip_dest; 142 u_int i = 0; 143 ND_PRINT((ndo, "\n\t Simple Text Authentication data: ")); 144 for (; i < RIP_AUTHLEN; p++, i++) 145 ND_PRINT((ndo, "%c", ND_ISPRINT(*p) ? *p : '.')); 146 } else if (auth_type == 3) { 147 ND_PRINT((ndo, "\n\t Auth header:")); 148 ND_PRINT((ndo, " Packet Len %u,", EXTRACT_16BITS((uint8_t *)ni + 4))); 149 ND_PRINT((ndo, " Key-ID %u,", *((uint8_t *)ni + 6))); 150 ND_PRINT((ndo, " Auth Data Len %u,", *((uint8_t *)ni + 7))); 151 ND_PRINT((ndo, " SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask))); 152 ND_PRINT((ndo, " MBZ %u,", EXTRACT_32BITS(&ni->rip_router))); 153 ND_PRINT((ndo, " MBZ %u", EXTRACT_32BITS(&ni->rip_metric))); 154 } else if (auth_type == 1) { 155 ND_PRINT((ndo, "\n\t Auth trailer:")); 156 print_unknown_data(ndo, (uint8_t *)&ni->rip_dest, "\n\t ", remaining); 157 return remaining; /* AT spans till the packet end */ 158 } else { 159 ND_PRINT((ndo, "\n\t Unknown (%u) Authentication data:", 160 EXTRACT_16BITS(&ni->rip_tag))); 161 print_unknown_data(ndo, (uint8_t *)&ni->rip_dest, "\n\t ", remaining); 162 } 163 } else if (family != BSD_AFNUM_INET && family != 0) { 164 ND_PRINT((ndo, "\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family))); 165 print_unknown_data(ndo, (uint8_t *)&ni->rip_tag, "\n\t ", RIP_ROUTELEN-2); 166 } else { /* BSD_AFNUM_INET or AFI 0 */ 167 ND_PRINT((ndo, "\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", 168 tok2str(bsd_af_values, "%u", family), 169 ipaddr_string(ndo, &ni->rip_dest), 170 mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)), 171 EXTRACT_16BITS(&ni->rip_tag), 172 EXTRACT_32BITS(&ni->rip_metric))); 173 if (EXTRACT_32BITS(&ni->rip_router)) 174 ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ni->rip_router))); 175 else 176 ND_PRINT((ndo, "self")); 177 } 178 return sizeof (*ni); 179 } 180 181 void 182 rip_print(netdissect_options *ndo, 183 const u_char *dat, u_int length) 184 { 185 register const struct rip *rp; 186 register const struct rip_netinfo *ni; 187 register u_int i, j; 188 189 if (ndo->ndo_snapend < dat) { 190 ND_PRINT((ndo, " %s", tstr)); 191 return; 192 } 193 i = ndo->ndo_snapend - dat; 194 if (i > length) 195 i = length; 196 if (i < sizeof(*rp)) { 197 ND_PRINT((ndo, " %s", tstr)); 198 return; 199 } 200 i -= sizeof(*rp); 201 202 rp = (struct rip *)dat; 203 204 ND_PRINT((ndo, "%sRIPv%u", 205 (ndo->ndo_vflag >= 1) ? "\n\t" : "", 206 rp->rip_vers)); 207 208 switch (rp->rip_vers) { 209 case 0: 210 /* 211 * RFC 1058. 212 * 213 * XXX - RFC 1058 says 214 * 215 * 0 Datagrams whose version number is zero are to be ignored. 216 * These are from a previous version of the protocol, whose 217 * packet format was machine-specific. 218 * 219 * so perhaps we should just dump the packet, in hex. 220 */ 221 print_unknown_data(ndo, (uint8_t *)&rp->rip_cmd, "\n\t", length); 222 break; 223 default: 224 /* dump version and lets see if we know the commands name*/ 225 ND_PRINT((ndo, ", %s, length: %u", 226 tok2str(rip_cmd_values, 227 "unknown command (%u)", 228 rp->rip_cmd), 229 length)); 230 231 if (ndo->ndo_vflag < 1) 232 return; 233 234 switch (rp->rip_cmd) { 235 case RIPCMD_REQUEST: 236 case RIPCMD_RESPONSE: 237 j = length / sizeof(*ni); 238 ND_PRINT((ndo, ", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : "")); 239 ni = (struct rip_netinfo *)(rp + 1); 240 for (; i >= sizeof(*ni); ++ni) { 241 if (rp->rip_vers == 1) 242 { 243 rip_entry_print_v1(ndo, ni); 244 i -= sizeof(*ni); 245 } 246 else if (rp->rip_vers == 2) 247 i -= rip_entry_print_v2(ndo, ni, i); 248 else 249 break; 250 } 251 if (i) 252 ND_PRINT((ndo, "%s", tstr)); 253 break; 254 255 case RIPCMD_TRACEOFF: 256 case RIPCMD_POLL: 257 case RIPCMD_POLLENTRY: 258 break; 259 260 case RIPCMD_TRACEON: 261 /* fall through */ 262 default: 263 if (ndo->ndo_vflag <= 1) { 264 if(!print_unknown_data(ndo, (uint8_t *)rp, "\n\t", length)) 265 return; 266 } 267 break; 268 } 269 /* do we want to see an additionally hexdump ? */ 270 if (ndo->ndo_vflag> 1) { 271 if(!print_unknown_data(ndo, (uint8_t *)rp, "\n\t", length)) 272 return; 273 } 274 } 275 } 276 277 278