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 1.2 2010/12/05 05:11:30 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) { 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 } /* BSD_AFNUM_INET */ 122 printf("\n\t %s, metric: %u", 123 ipaddr_string(&ni->rip_dest), 124 EXTRACT_32BITS(&ni->rip_metric)); 125 } 126 127 static void 128 rip_entry_print_v2(register const struct rip_netinfo *ni) 129 { 130 register u_char *p; 131 register u_short family; 132 u_char buf[RIP_AUTHLEN]; 133 134 family = EXTRACT_16BITS(&ni->rip_family); 135 if (family == 0xFFFF) { /* 16 bytes authentication ? */ 136 if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */ 137 memcpy(buf, &ni->rip_dest, sizeof(buf)); 138 buf[sizeof(buf)-1] = '\0'; 139 for (p = buf; *p; p++) { 140 if (!isprint(*p)) 141 break; 142 } 143 printf("\n\t Simple Text Authentication data: %s", buf); 144 } else { 145 printf("\n\t Unknown (%u) Authentication data:", 146 EXTRACT_16BITS(&ni->rip_tag)); 147 print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",RIP_AUTHLEN); 148 } 149 } else if (family != BSD_AFNUM_INET) { 150 printf("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)); 151 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2); 152 return; 153 } else { /* BSD_AFNUM_INET */ 154 printf("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", 155 tok2str(bsd_af_values, "Unknown (%u)", family), 156 ipaddr_string(&ni->rip_dest), 157 mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)), 158 EXTRACT_16BITS(&ni->rip_tag), 159 EXTRACT_32BITS(&ni->rip_metric)); 160 if (EXTRACT_32BITS(&ni->rip_router)) 161 printf("%s", ipaddr_string(&ni->rip_router)); 162 else 163 printf("self"); 164 } 165 } 166 167 void 168 rip_print(const u_char *dat, u_int length) 169 { 170 register const struct rip *rp; 171 register const struct rip_netinfo *ni; 172 register u_int i, j; 173 register int trunc; 174 175 if (snapend < dat) { 176 printf(" [|rip]"); 177 return; 178 } 179 i = snapend - dat; 180 if (i > length) 181 i = length; 182 if (i < sizeof(*rp)) { 183 printf(" [|rip]"); 184 return; 185 } 186 i -= sizeof(*rp); 187 188 rp = (struct rip *)dat; 189 190 printf("%sRIPv%u", 191 (vflag >= 1) ? "\n\t" : "", 192 rp->rip_vers); 193 194 switch (rp->rip_vers) { 195 case 0: 196 /* 197 * RFC 1058. 198 * 199 * XXX - RFC 1058 says 200 * 201 * 0 Datagrams whose version number is zero are to be ignored. 202 * These are from a previous version of the protocol, whose 203 * packet format was machine-specific. 204 * 205 * so perhaps we should just dump the packet, in hex. 206 */ 207 print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length); 208 break; 209 default: 210 /* dump version and lets see if we know the commands name*/ 211 printf(", %s, length: %u", 212 tok2str(rip_cmd_values, 213 "unknown command (%u)", 214 rp->rip_cmd), 215 length); 216 217 if (vflag < 1) 218 return; 219 220 switch (rp->rip_cmd) { 221 case RIPCMD_RESPONSE: 222 j = length / sizeof(*ni); 223 printf(", routes: %u",j); 224 trunc = (i / sizeof(*ni)) != j; 225 ni = (struct rip_netinfo *)(rp + 1); 226 for (; i >= sizeof(*ni); ++ni) { 227 if (rp->rip_vers == 1) 228 rip_entry_print_v1(ni); 229 else if (rp->rip_vers == 2) 230 rip_entry_print_v2(ni); 231 else 232 break; 233 i -= sizeof(*ni); 234 } 235 if (trunc) 236 printf("[|rip]"); 237 break; 238 239 case RIPCMD_REQUEST: 240 case RIPCMD_TRACEOFF: 241 case RIPCMD_POLL: 242 case RIPCMD_POLLENTRY: 243 break; 244 245 case RIPCMD_TRACEON: 246 /* fall through */ 247 default: 248 if (vflag <= 1) { 249 if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) 250 return; 251 } 252 break; 253 } 254 /* do we want to see an additionally hexdump ? */ 255 if (vflag> 1) { 256 if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) 257 return; 258 } 259 } 260 } 261 262 263