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 #if 0 25 static const char rcsid[] _U_ = 26 "@(#) Header: /tcpdump/master/tcpdump/print-rip.c,v 1.59 2006-03-23 14:58:44 hannes Exp (LBL)"; 27 #else 28 __RCSID("$NetBSD: print-rip.c,v 1.4 2013/12/31 17:33:31 christos Exp $"); 29 #endif 30 #endif 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <tcpdump-stdinc.h> 37 38 #include <stdio.h> 39 #include <string.h> 40 41 #include "interface.h" 42 #include "addrtoname.h" 43 #include "extract.h" /* must come after interface.h */ 44 45 #include "af.h" 46 47 struct rip { 48 u_int8_t rip_cmd; /* request/response */ 49 u_int8_t rip_vers; /* protocol version # */ 50 u_int8_t unused[2]; /* unused */ 51 }; 52 53 #define RIPCMD_REQUEST 1 /* want info */ 54 #define RIPCMD_RESPONSE 2 /* responding to request */ 55 #define RIPCMD_TRACEON 3 /* turn tracing on */ 56 #define RIPCMD_TRACEOFF 4 /* turn it off */ 57 #define RIPCMD_POLL 5 /* want info from everybody */ 58 #define RIPCMD_POLLENTRY 6 /* poll for entry */ 59 60 static const struct tok rip_cmd_values[] = { 61 { RIPCMD_REQUEST, "Request" }, 62 { RIPCMD_RESPONSE, "Response" }, 63 { RIPCMD_TRACEON, "Trace on" }, 64 { RIPCMD_TRACEOFF, "Trace off" }, 65 { RIPCMD_POLL, "Poll" }, 66 { RIPCMD_POLLENTRY, "Poll Entry" }, 67 { 0, NULL} 68 }; 69 70 #define RIP_AUTHLEN 16 71 #define RIP_ROUTELEN 20 72 73 /* 74 * rfc 1723 75 * 76 * 0 1 2 3 3 77 * 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 78 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 79 * | Command (1) | Version (1) | unused | 80 * +---------------+---------------+-------------------------------+ 81 * | Address Family Identifier (2) | Route Tag (2) | 82 * +-------------------------------+-------------------------------+ 83 * | IP Address (4) | 84 * +---------------------------------------------------------------+ 85 * | Subnet Mask (4) | 86 * +---------------------------------------------------------------+ 87 * | Next Hop (4) | 88 * +---------------------------------------------------------------+ 89 * | Metric (4) | 90 * +---------------------------------------------------------------+ 91 * 92 */ 93 94 struct rip_netinfo { 95 u_int16_t rip_family; 96 u_int16_t rip_tag; 97 u_int32_t rip_dest; 98 u_int32_t rip_dest_mask; 99 u_int32_t rip_router; 100 u_int32_t rip_metric; /* cost of route */ 101 }; 102 103 static void 104 rip_entry_print_v1(register const struct rip_netinfo *ni) 105 { 106 register u_short family; 107 108 /* RFC 1058 */ 109 family = EXTRACT_16BITS(&ni->rip_family); 110 if (family != BSD_AFNUM_INET && family != 0) { 111 printf("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family)); 112 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); 113 return; 114 } 115 if (EXTRACT_16BITS(&ni->rip_tag) || 116 EXTRACT_32BITS(&ni->rip_dest_mask) || 117 EXTRACT_32BITS(&ni->rip_router)) { 118 /* MBZ fields not zero */ 119 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); 120 return; 121 } 122 if (family == 0) { 123 printf("\n\t AFI 0, %s, metric: %u", 124 ipaddr_string(&ni->rip_dest), 125 EXTRACT_32BITS(&ni->rip_metric)); 126 return; 127 } /* BSD_AFNUM_INET */ 128 printf("\n\t %s, metric: %u", 129 ipaddr_string(&ni->rip_dest), 130 EXTRACT_32BITS(&ni->rip_metric)); 131 } 132 133 static unsigned 134 rip_entry_print_v2(register const struct rip_netinfo *ni, const unsigned remaining) 135 { 136 register u_short family; 137 138 family = EXTRACT_16BITS(&ni->rip_family); 139 if (family == 0xFFFF) { /* variable-sized authentication structures */ 140 u_int16_t auth_type = EXTRACT_16BITS(&ni->rip_tag); 141 if (auth_type == 2) { 142 register u_char *p = (u_char *)&ni->rip_dest; 143 u_int i = 0; 144 printf("\n\t Simple Text Authentication data: "); 145 for (; i < RIP_AUTHLEN; p++, i++) 146 putchar (isprint(*p) ? *p : '.'); 147 } else if (auth_type == 3) { 148 printf("\n\t Auth header:"); 149 printf(" Packet Len %u,", EXTRACT_16BITS((u_int8_t *)ni + 4)); 150 printf(" Key-ID %u,", *((u_int8_t *)ni + 6)); 151 printf(" Auth Data Len %u,", *((u_int8_t *)ni + 7)); 152 printf(" SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask)); 153 printf(" MBZ %u,", EXTRACT_32BITS(&ni->rip_router)); 154 printf(" MBZ %u", EXTRACT_32BITS(&ni->rip_metric)); 155 } else if (auth_type == 1) { 156 printf("\n\t Auth trailer:"); 157 print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",remaining); 158 return remaining; /* AT spans till the packet end */ 159 } else { 160 printf("\n\t Unknown (%u) Authentication data:", 161 EXTRACT_16BITS(&ni->rip_tag)); 162 print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",remaining); 163 } 164 } else if (family != BSD_AFNUM_INET && family != 0) { 165 printf("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)); 166 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2); 167 } else { /* BSD_AFNUM_INET or AFI 0 */ 168 printf("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", 169 tok2str(bsd_af_values, "%u", family), 170 ipaddr_string(&ni->rip_dest), 171 mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)), 172 EXTRACT_16BITS(&ni->rip_tag), 173 EXTRACT_32BITS(&ni->rip_metric)); 174 if (EXTRACT_32BITS(&ni->rip_router)) 175 printf("%s", ipaddr_string(&ni->rip_router)); 176 else 177 printf("self"); 178 } 179 return sizeof (*ni); 180 } 181 182 void 183 rip_print(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 (snapend < dat) { 190 printf(" [|rip]"); 191 return; 192 } 193 i = snapend - dat; 194 if (i > length) 195 i = length; 196 if (i < sizeof(*rp)) { 197 printf(" [|rip]"); 198 return; 199 } 200 i -= sizeof(*rp); 201 202 rp = (struct rip *)dat; 203 204 printf("%sRIPv%u", 205 (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((u_int8_t *)&rp->rip_cmd,"\n\t",length); 222 break; 223 default: 224 /* dump version and lets see if we know the commands name*/ 225 printf(", %s, length: %u", 226 tok2str(rip_cmd_values, 227 "unknown command (%u)", 228 rp->rip_cmd), 229 length); 230 231 if (vflag < 1) 232 return; 233 234 switch (rp->rip_cmd) { 235 case RIPCMD_REQUEST: 236 case RIPCMD_RESPONSE: 237 j = length / sizeof(*ni); 238 printf(", 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(ni); 244 i -= sizeof(*ni); 245 } 246 else if (rp->rip_vers == 2) 247 i -= rip_entry_print_v2(ni, i); 248 else 249 break; 250 } 251 if (i) 252 printf("[|rip]"); 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 (vflag <= 1) { 264 if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) 265 return; 266 } 267 break; 268 } 269 /* do we want to see an additionally hexdump ? */ 270 if (vflag> 1) { 271 if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) 272 return; 273 } 274 } 275 } 276 277 278