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 /* \summary: Routing Information Protocol (RIP) printer */ 23 24 #ifdef HAVE_CONFIG_H 25 #include "config.h" 26 #endif 27 28 #include <netdissect-stdinc.h> 29 30 #include <stdio.h> 31 32 #include "netdissect.h" 33 #include "addrtoname.h" 34 #include "extract.h" 35 36 #include "af.h" 37 38 static const char tstr[] = "[|rip]"; 39 40 struct rip { 41 uint8_t rip_cmd; /* request/response */ 42 uint8_t rip_vers; /* protocol version # */ 43 uint8_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 uint16_t rip_family; 89 uint16_t rip_tag; 90 uint32_t rip_dest; 91 uint32_t rip_dest_mask; 92 uint32_t rip_router; 93 uint32_t rip_metric; /* cost of route */ 94 }; 95 96 static void 97 rip_entry_print_v1(netdissect_options *ndo, 98 register const struct rip_netinfo *ni) 99 { 100 register u_short family; 101 102 /* RFC 1058 */ 103 family = EXTRACT_16BITS(&ni->rip_family); 104 if (family != BSD_AFNUM_INET && family != 0) { 105 ND_PRINT((ndo, "\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family))); 106 print_unknown_data(ndo, (const uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN); 107 return; 108 } 109 if (EXTRACT_16BITS(&ni->rip_tag) || 110 EXTRACT_32BITS(&ni->rip_dest_mask) || 111 EXTRACT_32BITS(&ni->rip_router)) { 112 /* MBZ fields not zero */ 113 print_unknown_data(ndo, (const uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN); 114 return; 115 } 116 if (family == 0) { 117 ND_PRINT((ndo, "\n\t AFI 0, %s, metric: %u", 118 ipaddr_string(ndo, &ni->rip_dest), 119 EXTRACT_32BITS(&ni->rip_metric))); 120 return; 121 } /* BSD_AFNUM_INET */ 122 ND_PRINT((ndo, "\n\t %s, metric: %u", 123 ipaddr_string(ndo, &ni->rip_dest), 124 EXTRACT_32BITS(&ni->rip_metric))); 125 } 126 127 static unsigned 128 rip_entry_print_v2(netdissect_options *ndo, 129 register const struct rip_netinfo *ni, const unsigned remaining) 130 { 131 register u_short family; 132 133 family = EXTRACT_16BITS(&ni->rip_family); 134 if (family == 0xFFFF) { /* variable-sized authentication structures */ 135 uint16_t auth_type = EXTRACT_16BITS(&ni->rip_tag); 136 if (auth_type == 2) { 137 register const u_char *p = (const u_char *)&ni->rip_dest; 138 u_int i = 0; 139 ND_PRINT((ndo, "\n\t Simple Text Authentication data: ")); 140 for (; i < RIP_AUTHLEN; p++, i++) 141 ND_PRINT((ndo, "%c", ND_ISPRINT(*p) ? *p : '.')); 142 } else if (auth_type == 3) { 143 ND_PRINT((ndo, "\n\t Auth header:")); 144 ND_PRINT((ndo, " Packet Len %u,", EXTRACT_16BITS((const uint8_t *)ni + 4))); 145 ND_PRINT((ndo, " Key-ID %u,", *((const uint8_t *)ni + 6))); 146 ND_PRINT((ndo, " Auth Data Len %u,", *((const uint8_t *)ni + 7))); 147 ND_PRINT((ndo, " SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask))); 148 ND_PRINT((ndo, " MBZ %u,", EXTRACT_32BITS(&ni->rip_router))); 149 ND_PRINT((ndo, " MBZ %u", EXTRACT_32BITS(&ni->rip_metric))); 150 } else if (auth_type == 1) { 151 ND_PRINT((ndo, "\n\t Auth trailer:")); 152 print_unknown_data(ndo, (const uint8_t *)&ni->rip_dest, "\n\t ", remaining); 153 return remaining; /* AT spans till the packet end */ 154 } else { 155 ND_PRINT((ndo, "\n\t Unknown (%u) Authentication data:", 156 EXTRACT_16BITS(&ni->rip_tag))); 157 print_unknown_data(ndo, (const uint8_t *)&ni->rip_dest, "\n\t ", remaining); 158 } 159 } else if (family != BSD_AFNUM_INET && family != 0) { 160 ND_PRINT((ndo, "\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family))); 161 print_unknown_data(ndo, (const uint8_t *)&ni->rip_tag, "\n\t ", RIP_ROUTELEN-2); 162 } else { /* BSD_AFNUM_INET or AFI 0 */ 163 ND_PRINT((ndo, "\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ", 164 tok2str(bsd_af_values, "%u", family), 165 ipaddr_string(ndo, &ni->rip_dest), 166 mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)), 167 EXTRACT_16BITS(&ni->rip_tag), 168 EXTRACT_32BITS(&ni->rip_metric))); 169 if (EXTRACT_32BITS(&ni->rip_router)) 170 ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ni->rip_router))); 171 else 172 ND_PRINT((ndo, "self")); 173 } 174 return sizeof (*ni); 175 } 176 177 void 178 rip_print(netdissect_options *ndo, 179 const u_char *dat, u_int length) 180 { 181 register const struct rip *rp; 182 register const struct rip_netinfo *ni; 183 register u_int i, j; 184 185 if (ndo->ndo_snapend < dat) { 186 ND_PRINT((ndo, " %s", tstr)); 187 return; 188 } 189 i = ndo->ndo_snapend - dat; 190 if (i > length) 191 i = length; 192 if (i < sizeof(*rp)) { 193 ND_PRINT((ndo, " %s", tstr)); 194 return; 195 } 196 i -= sizeof(*rp); 197 198 rp = (const struct rip *)dat; 199 200 ND_PRINT((ndo, "%sRIPv%u", 201 (ndo->ndo_vflag >= 1) ? "\n\t" : "", 202 rp->rip_vers)); 203 204 switch (rp->rip_vers) { 205 case 0: 206 /* 207 * RFC 1058. 208 * 209 * XXX - RFC 1058 says 210 * 211 * 0 Datagrams whose version number is zero are to be ignored. 212 * These are from a previous version of the protocol, whose 213 * packet format was machine-specific. 214 * 215 * so perhaps we should just dump the packet, in hex. 216 */ 217 print_unknown_data(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length); 218 break; 219 default: 220 /* dump version and lets see if we know the commands name*/ 221 ND_PRINT((ndo, ", %s, length: %u", 222 tok2str(rip_cmd_values, 223 "unknown command (%u)", 224 rp->rip_cmd), 225 length)); 226 227 if (ndo->ndo_vflag < 1) 228 return; 229 230 switch (rp->rip_cmd) { 231 case RIPCMD_REQUEST: 232 case RIPCMD_RESPONSE: 233 j = length / sizeof(*ni); 234 ND_PRINT((ndo, ", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : "")); 235 ni = (const struct rip_netinfo *)(rp + 1); 236 for (; i >= sizeof(*ni); ++ni) { 237 if (rp->rip_vers == 1) 238 { 239 rip_entry_print_v1(ndo, ni); 240 i -= sizeof(*ni); 241 } 242 else if (rp->rip_vers == 2) 243 i -= rip_entry_print_v2(ndo, ni, i); 244 else 245 break; 246 } 247 if (i) 248 ND_PRINT((ndo, "%s", tstr)); 249 break; 250 251 case RIPCMD_TRACEOFF: 252 case RIPCMD_POLL: 253 case RIPCMD_POLLENTRY: 254 break; 255 256 case RIPCMD_TRACEON: 257 /* fall through */ 258 default: 259 if (ndo->ndo_vflag <= 1) { 260 if(!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length)) 261 return; 262 } 263 break; 264 } 265 /* do we want to see an additionally hexdump ? */ 266 if (ndo->ndo_vflag> 1) { 267 if(!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length)) 268 return; 269 } 270 } 271 } 272 273 274
