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 #ifndef lint 23 static const char rcsid[] _U_ = 24 "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.59 2006-03-23 14:58:44 hannes Exp $ (LBL)"; 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #include <tcpdump-stdinc.h> 32 33 #include <stdio.h> 34 #include <string.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 struct rip { 43 u_int8_t rip_cmd; /* request/response */ 44 u_int8_t rip_vers; /* protocol version # */ 45 u_int8_t unused[2]; /* unused */ 46 }; 47 48 #define RIPCMD_REQUEST 1 /* want info */ 49 #define RIPCMD_RESPONSE 2 /* responding to request */ 50 #define RIPCMD_TRACEON 3 /* turn tracing on */ 51 #define RIPCMD_TRACEOFF 4 /* turn it off */ 52 #define RIPCMD_POLL 5 /* want info from everybody */ 53 #define RIPCMD_POLLENTRY 6 /* poll for entry */ 54 55 static const struct tok rip_cmd_values[] = { 56 { RIPCMD_REQUEST, "Request" }, 57 { RIPCMD_RESPONSE, "Response" }, 58 { RIPCMD_TRACEON, "Trace on" }, 59 { RIPCMD_TRACEOFF, "Trace off" }, 60 { RIPCMD_POLL, "Poll" }, 61 { RIPCMD_POLLENTRY, "Poll Entry" }, 62 { 0, NULL} 63 }; 64 65 #define RIP_AUTHLEN 16 66 #define RIP_ROUTELEN 20 67 68 /* 69 * rfc 1723 70 * 71 * 0 1 2 3 3 72 * 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 73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 74 * | Command (1) | Version (1) | unused | 75 * +---------------+---------------+-------------------------------+ 76 * | Address Family Identifier (2) | Route Tag (2) | 77 * +-------------------------------+-------------------------------+ 78 * | IP Address (4) | 79 * +---------------------------------------------------------------+ 80 * | Subnet Mask (4) | 81 * +---------------------------------------------------------------+ 82 * | Next Hop (4) | 83 * +---------------------------------------------------------------+ 84 * | Metric (4) | 85 * +---------------------------------------------------------------+ 86 * 87 */ 88 89 struct rip_netinfo { 90 u_int16_t rip_family; 91 u_int16_t rip_tag; 92 u_int32_t rip_dest; 93 u_int32_t rip_dest_mask; 94 u_int32_t rip_router; 95 u_int32_t rip_metric; /* cost of route */ 96 }; 97 98 static void 99 rip_entry_print_v1(register const struct rip_netinfo *ni) 100 { 101 register u_short family; 102 103 /* RFC 1058 */ 104 family = EXTRACT_16BITS(&ni->rip_family); 105 if (family != BSD_AFNUM_INET) { 106 printf("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family)); 107 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); 108 return; 109 } 110 if (EXTRACT_16BITS(&ni->rip_tag) || 111 EXTRACT_32BITS(&ni->rip_dest_mask) || 112 EXTRACT_32BITS(&ni->rip_router)) { 113 /* MBZ fields not zero */ 114 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); 115 return; 116 } /* BSD_AFNUM_INET */ 117 printf("\n\t %s, metric: %u", 118 ipaddr_string(&ni->rip_dest), 119 EXTRACT_32BITS(&ni->rip_metric)); 120 } 121 122 static void 123 rip_entry_print_v2(register const struct rip_netinfo *ni) 124 { 125 register u_char *p; 126 register u_short family; 127 u_char buf[RIP_AUTHLEN]; 128 129 family = EXTRACT_16BITS(&ni->rip_family); 130 if (family == 0xFFFF) { /* 16 bytes authentication ? */ 131 if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */ 132 memcpy(buf, &ni->rip_dest, sizeof(buf)); 133 buf[sizeof(buf)-1] = '\0'; 134 for (p = buf; *p; p++) { 135 if (!isprint(*p)) 136 break; 137 } 138 printf("\n\t Simple Text Authentication data: %s", buf); 139 } else { 140 printf("\n\t Unknown (%u) Authentication data:", 141 EXTRACT_16BITS(&ni->rip_tag)); 142 print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",RIP_AUTHLEN); 143 } 144 } else if (family != BSD_AFNUM_INET) { 145 printf("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)); 146 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2); 147 return; 148 } else { /* BSD_AFNUM_INET */ 149 printf("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", 150 tok2str(bsd_af_values, "Unknown (%u)", family), 151 ipaddr_string(&ni->rip_dest), 152 mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)), 153 EXTRACT_16BITS(&ni->rip_tag), 154 EXTRACT_32BITS(&ni->rip_metric)); 155 if (EXTRACT_32BITS(&ni->rip_router)) 156 printf("%s", ipaddr_string(&ni->rip_router)); 157 else 158 printf("self"); 159 } 160 } 161 162 void 163 rip_print(const u_char *dat, u_int length) 164 { 165 register const struct rip *rp; 166 register const struct rip_netinfo *ni; 167 register u_int i, j; 168 register int trunc; 169 170 if (snapend < dat) { 171 printf(" [|rip]"); 172 return; 173 } 174 i = snapend - dat; 175 if (i > length) 176 i = length; 177 if (i < sizeof(*rp)) { 178 printf(" [|rip]"); 179 return; 180 } 181 i -= sizeof(*rp); 182 183 rp = (struct rip *)dat; 184 185 printf("%sRIPv%u", 186 (vflag >= 1) ? "\n\t" : "", 187 rp->rip_vers); 188 189 switch (rp->rip_vers) { 190 case 0: 191 /* 192 * RFC 1058. 193 * 194 * XXX - RFC 1058 says 195 * 196 * 0 Datagrams whose version number is zero are to be ignored. 197 * These are from a previous version of the protocol, whose 198 * packet format was machine-specific. 199 * 200 * so perhaps we should just dump the packet, in hex. 201 */ 202 print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length); 203 break; 204 default: 205 /* dump version and lets see if we know the commands name*/ 206 printf(", %s, length: %u", 207 tok2str(rip_cmd_values, 208 "unknown command (%u)", 209 rp->rip_cmd), 210 length); 211 212 if (vflag < 1) 213 return; 214 215 switch (rp->rip_cmd) { 216 case RIPCMD_RESPONSE: 217 j = length / sizeof(*ni); 218 printf(", routes: %u",j); 219 trunc = (i / sizeof(*ni)) != j; 220 ni = (struct rip_netinfo *)(rp + 1); 221 for (; i >= sizeof(*ni); ++ni) { 222 if (rp->rip_vers == 1) 223 rip_entry_print_v1(ni); 224 else if (rp->rip_vers == 2) 225 rip_entry_print_v2(ni); 226 else 227 break; 228 i -= sizeof(*ni); 229 } 230 if (trunc) 231 printf("[|rip]"); 232 break; 233 234 case RIPCMD_REQUEST: 235 case RIPCMD_TRACEOFF: 236 case RIPCMD_POLL: 237 case RIPCMD_POLLENTRY: 238 break; 239 240 case RIPCMD_TRACEON: 241 /* fall through */ 242 default: 243 if (vflag <= 1) { 244 if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) 245 return; 246 } 247 break; 248 } 249 /* do we want to see an additionally hexdump ? */ 250 if (vflag> 1) { 251 if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) 252 return; 253 } 254 } 255 } 256 257 258