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 1.57 2003/11/16 09:36:34 guy 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 struct rip { 41 u_int8_t rip_cmd; /* request/response */ 42 u_int8_t rip_vers; /* protocol version # */ 43 u_int8_t unused[2]; /* unused */ 44 }; 45 46 #define RIPCMD_REQUEST 1 /* want info */ 47 #define RIPCMD_RESPONSE 2 /* responding to request */ 48 #define RIPCMD_TRACEON 3 /* turn tracing on */ 49 #define RIPCMD_TRACEOFF 4 /* turn it off */ 50 #define RIPCMD_POLL 5 /* want info from everybody */ 51 #define RIPCMD_POLLENTRY 6 /* poll for entry */ 52 53 static const struct tok rip_cmd_values[] = { 54 { RIPCMD_REQUEST, "Request" }, 55 { RIPCMD_RESPONSE, "Response" }, 56 { RIPCMD_TRACEON, "Trace on" }, 57 { RIPCMD_TRACEOFF, "Trace off" }, 58 { RIPCMD_POLL, "Poll" }, 59 { RIPCMD_POLLENTRY, "Poll Entry" }, 60 { 0, NULL} 61 }; 62 63 #define RIP_AUTHLEN 16 64 #define RIP_ROUTELEN 20 65 66 /* 67 * rfc 1723 68 * 69 * 0 1 2 3 3 70 * 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 71 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 72 * | Command (1) | Version (1) | unused | 73 * +---------------+---------------+-------------------------------+ 74 * | Address Family Identifier (2) | Route Tag (2) | 75 * +-------------------------------+-------------------------------+ 76 * | IP Address (4) | 77 * +---------------------------------------------------------------+ 78 * | Subnet Mask (4) | 79 * +---------------------------------------------------------------+ 80 * | Next Hop (4) | 81 * +---------------------------------------------------------------+ 82 * | Metric (4) | 83 * +---------------------------------------------------------------+ 84 * 85 */ 86 87 struct rip_netinfo { 88 u_int16_t rip_family; 89 u_int16_t rip_tag; 90 u_int32_t rip_dest; 91 u_int32_t rip_dest_mask; 92 u_int32_t rip_router; 93 u_int32_t rip_metric; /* cost of route */ 94 }; 95 96 static void 97 rip_entry_print_v1(register const struct rip_netinfo *ni) 98 { 99 register u_short family; 100 101 /* RFC 1058 */ 102 family = EXTRACT_16BITS(&ni->rip_family); 103 if (family != AF_INET) { 104 printf("\n\t AFI: %u:", family); 105 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); 106 return; 107 } 108 if (EXTRACT_16BITS(&ni->rip_tag) || 109 EXTRACT_32BITS(&ni->rip_dest_mask) || 110 EXTRACT_32BITS(&ni->rip_router)) { 111 /* MBZ fields not zero */ 112 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t ",RIP_ROUTELEN); 113 return; 114 } /* AF_INET */ 115 printf("\n\t %s, metric: %u", 116 ipaddr_string(&ni->rip_dest), 117 EXTRACT_32BITS(&ni->rip_metric)); 118 } 119 120 static void 121 rip_entry_print_v2(register const struct rip_netinfo *ni) 122 { 123 register u_char *p; 124 register u_short family; 125 u_char buf[RIP_AUTHLEN]; 126 127 family = EXTRACT_16BITS(&ni->rip_family); 128 if (family == 0xFFFF) { /* 16 bytes authentication ? */ 129 if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */ 130 memcpy(buf, &ni->rip_dest, sizeof(buf)); 131 buf[sizeof(buf)-1] = '\0'; 132 for (p = buf; *p; p++) { 133 if (!isprint(*p)) 134 break; 135 } 136 printf("\n\t Simple Text Authentication data: %s", buf); 137 } else { 138 printf("\n\t Unknown (%u) Authentication data:", 139 EXTRACT_16BITS(&ni->rip_tag)); 140 print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t ",RIP_AUTHLEN); 141 } 142 } else if (family != AF_INET) { 143 printf("\n\t AFI: %u", family); 144 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2); 145 return; 146 } else { /* AF_INET */ 147 printf("\n\t AFI: IPv4: %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", 148 ipaddr_string(&ni->rip_dest), 149 mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)), 150 EXTRACT_16BITS(&ni->rip_tag), 151 EXTRACT_32BITS(&ni->rip_metric)); 152 if (EXTRACT_32BITS(&ni->rip_router)) 153 printf("%s", ipaddr_string(&ni->rip_router)); 154 else 155 printf("self"); 156 } 157 } 158 159 void 160 rip_print(const u_char *dat, u_int length) 161 { 162 register const struct rip *rp; 163 register const struct rip_netinfo *ni; 164 register u_int i, j; 165 register int trunc; 166 167 if (snapend < dat) { 168 printf(" [|rip]"); 169 return; 170 } 171 i = snapend - dat; 172 if (i > length) 173 i = length; 174 if (i < sizeof(*rp)) { 175 printf(" [|rip]"); 176 return; 177 } 178 i -= sizeof(*rp); 179 180 rp = (struct rip *)dat; 181 182 printf("%sRIPv%u", 183 (vflag >= 1) ? "\n\t" : "", 184 rp->rip_vers); 185 186 switch (rp->rip_vers) { 187 case 0: 188 /* 189 * RFC 1058. 190 * 191 * XXX - RFC 1058 says 192 * 193 * 0 Datagrams whose version number is zero are to be ignored. 194 * These are from a previous version of the protocol, whose 195 * packet format was machine-specific. 196 * 197 * so perhaps we should just dump the packet, in hex. 198 */ 199 print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length); 200 break; 201 default: 202 /* dump version and lets see if we know the commands name*/ 203 printf(", %s, length: %u", 204 tok2str(rip_cmd_values, 205 "unknown command (%u)", 206 rp->rip_cmd), 207 length); 208 209 if (vflag < 1) 210 return; 211 212 switch (rp->rip_cmd) { 213 case RIPCMD_RESPONSE: 214 j = length / sizeof(*ni); 215 printf(", routes: %u",j); 216 trunc = (i / sizeof(*ni)) != j; 217 ni = (struct rip_netinfo *)(rp + 1); 218 for (; i >= sizeof(*ni); ++ni) { 219 if (rp->rip_vers == 1) 220 rip_entry_print_v1(ni); 221 else if (rp->rip_vers == 2) 222 rip_entry_print_v2(ni); 223 else 224 break; 225 i -= sizeof(*ni); 226 } 227 if (trunc) 228 printf("[|rip]"); 229 break; 230 231 case RIPCMD_REQUEST: 232 case RIPCMD_TRACEOFF: 233 case RIPCMD_POLL: 234 case RIPCMD_POLLENTRY: 235 break; 236 237 case RIPCMD_TRACEON: 238 /* fall through */ 239 default: 240 if (vflag <= 1) { 241 if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) 242 return; 243 } 244 break; 245 } 246 /* do we want to see an additionally hexdump ? */ 247 if (vflag> 1) { 248 if(!print_unknown_data((u_int8_t *)rp,"\n\t",length)) 249 return; 250 } 251 } 252 } 253 254 255
