1 /* 2 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997 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 * Code by Gert Doering, SpaceNet GmbH, gert (at) space.net 22 * 23 * Reference documentation: 24 * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm 25 */ 26 27 #ifndef lint 28 static const char rcsid[] _U_ = 29 "@(#) $Header: /tcpdump/master/tcpdump/print-cdp.c,v 1.25 2004-10-07 14:53:11 hannes Exp $"; 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 #include "nlpid.h" 45 46 #define CDP_HEADER_LEN 4 47 48 static const struct tok cdp_tlv_values[] = { 49 { 0x01, "Device-ID"}, 50 { 0x02, "Address"}, 51 { 0x03, "Port-ID"}, 52 { 0x04, "Capability"}, 53 { 0x05, "Version String"}, 54 { 0x06, "Platform"}, 55 { 0x07, "Prefixes"}, 56 { 0x08, "Protocol-Hello option"}, 57 { 0x09, "VTP Management Domain"}, 58 { 0x0a, "Native VLAN ID"}, 59 { 0x0b, "Duplex"}, 60 { 0x0e, "ATA-186 VoIP VLAN request"}, 61 { 0x0f, "ATA-186 VoIP VLAN assignment"}, 62 { 0x10, "power consumption"}, 63 { 0x11, "MTU"}, 64 { 0x12, "AVVID trust bitmap"}, 65 { 0x13, "AVVID untrusted ports CoS"}, 66 { 0x14, "System Name"}, 67 { 0x15, "System Object ID (not decoded)"}, 68 { 0x16, "Management Addresses"}, 69 { 0x17, "Physical Location"}, 70 { 0, NULL} 71 }; 72 73 static const struct tok cdp_capability_values[] = { 74 { 0x01, "Router" }, 75 { 0x02, "Transparent Bridge" }, 76 { 0x04, "Source Route Bridge" }, 77 { 0x08, "L2 Switch" }, 78 { 0x10, "L3 capable" }, 79 { 0x20, "IGMP snooping" }, 80 { 0x40, "L1 capable" }, 81 { 0, NULL } 82 }; 83 84 static int cdp_print_addr(const u_char *, int); 85 static int cdp_print_prefixes(const u_char *, int); 86 static unsigned long cdp_get_number(const u_char *, int); 87 88 void 89 cdp_print(const u_char *pptr, u_int length, u_int caplen) 90 { 91 int type, len, i, j; 92 const u_char *tptr; 93 94 if (caplen < CDP_HEADER_LEN) { 95 (void)printf("[|cdp]"); 96 return; 97 } 98 99 tptr = pptr; /* temporary pointer */ 100 101 if (!TTEST2(*tptr, CDP_HEADER_LEN)) 102 goto trunc; 103 printf("CDPv%u, ttl: %us", *tptr, *(tptr+1)); 104 if (vflag) 105 printf(", checksum: %u (unverified), length %u", EXTRACT_16BITS(tptr), length); 106 tptr += CDP_HEADER_LEN; 107 108 while (tptr < (pptr+length)) { 109 110 if (!TTEST2(*tptr, 4)) /* read out Type and Length */ 111 goto trunc; 112 type = EXTRACT_16BITS(tptr); 113 len = EXTRACT_16BITS(tptr+2); /* object length includes the 4 bytes header length */ 114 tptr += 4; 115 len -= 4; 116 117 if (!TTEST2(*tptr, len)) 118 goto trunc; 119 120 if (vflag || type == 1) { /* in non-verbose mode just print Device-ID */ 121 122 if (vflag) 123 printf("\n\t%s (0x%02x), length: %u byte%s: ", 124 tok2str(cdp_tlv_values,"unknown field type", type), 125 type, 126 len, 127 PLURAL_SUFFIX(len)); /* plural */ 128 129 switch (type) { 130 131 case 0x01: /* Device-ID */ 132 if (!vflag) 133 printf(", Device-ID "); 134 printf("'"); 135 fn_printn(tptr, len, NULL); 136 printf("'"); 137 break; 138 case 0x02: /* Address */ 139 if (cdp_print_addr(tptr, len) < 0) 140 goto trunc; 141 break; 142 case 0x03: /* Port-ID */ 143 printf("'"); 144 fn_printn(tptr, len, NULL); 145 printf("'"); 146 break; 147 case 0x04: /* Capabilities */ 148 printf("(0x%08x): %s", 149 EXTRACT_32BITS(tptr), 150 bittok2str(cdp_capability_values, "none",EXTRACT_32BITS(tptr))); 151 break; 152 case 0x05: /* Version */ 153 printf("\n\t "); 154 for (i=0;i<len;i++) { 155 j = *(tptr+i); 156 putchar(j); 157 if (j == 0x0a) /* lets rework the version string to get a nice identation */ 158 printf("\t "); 159 } 160 break; 161 case 0x06: /* Platform */ 162 printf("'"); 163 fn_printn(tptr, len, NULL); 164 printf("'"); 165 break; 166 case 0x07: /* Prefixes */ 167 if (cdp_print_prefixes(tptr, len) < 0) 168 goto trunc; 169 break; 170 case 0x08: /* Protocol Hello Option - not documented */ 171 break; 172 case 0x09: /* VTP Mgmt Domain - not documented */ 173 printf("'"); 174 fn_printn(tptr, len, NULL); 175 printf("'"); 176 break; 177 case 0x0a: /* Native VLAN ID - not documented */ 178 printf("%d",EXTRACT_16BITS(tptr)); 179 break; 180 case 0x0b: /* Duplex - not documented */ 181 printf("%s", *(tptr) ? "full": "half"); 182 break; 183 184 /* http://www.cisco.com/univercd/cc/td/doc/product/voice/ata/atarn/186rn21m.htm 185 * plus more details from other sources 186 */ 187 case 0x0e: /* ATA-186 VoIP VLAN request - incomplete doc. */ 188 printf("app %d, vlan %d", 189 *(tptr), EXTRACT_16BITS(tptr+1)); 190 break; 191 case 0x10: /* ATA-186 VoIP VLAN assignment - incomplete doc. */ 192 printf("%1.2fW", 193 cdp_get_number(tptr, len)/1000.0 ); 194 break; 195 case 0x11: /* MTU - not documented */ 196 printf("%u bytes", EXTRACT_32BITS(tptr)); 197 break; 198 case 0x12: /* AVVID trust bitmap - not documented */ 199 printf("0x%02x", *(tptr) ); 200 break; 201 case 0x13: /* AVVID untrusted port CoS - not documented */ 202 printf("0x%02x", *(tptr)); 203 break; 204 case 0x14: /* System Name - not documented */ 205 printf("'"); 206 fn_printn(tptr, len, NULL); 207 printf("'"); 208 break; 209 case 0x16: /* System Object ID - not documented */ 210 if (cdp_print_addr(tptr, len) < 0) 211 goto trunc; 212 break; 213 case 0x17: /* Physical Location - not documented */ 214 printf("0x%02x", *(tptr)); 215 if (len > 1) { 216 printf("/"); 217 fn_printn(tptr + 1, len - 1, NULL); 218 } 219 break; 220 default: 221 print_unknown_data(tptr,"\n\t ",len); 222 break; 223 } 224 } 225 /* avoid infinite loop */ 226 if (len == 0) 227 break; 228 tptr = tptr+len; 229 } 230 if (vflag < 1) 231 printf(", length %u",caplen); 232 233 return; 234 trunc: 235 printf("[|cdp]"); 236 } 237 238 /* 239 * Protocol type values. 240 * 241 * PT_NLPID means that the protocol type field contains an OSI NLPID. 242 * 243 * PT_IEEE_802_2 means that the protocol type field contains an IEEE 802.2 244 * LLC header that specifies that the payload is for that protocol. 245 */ 246 #define PT_NLPID 1 /* OSI NLPID */ 247 #define PT_IEEE_802_2 2 /* IEEE 802.2 LLC header */ 248 249 static int 250 cdp_print_addr(const u_char * p, int l) 251 { 252 int pt, pl, al, num; 253 const u_char *endp = p + l; 254 #ifdef INET6 255 static u_char prot_ipv6[] = { 256 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd 257 }; 258 #endif 259 260 TCHECK2(*p, 2); 261 num = EXTRACT_32BITS(p); 262 p += 4; 263 264 while (p < endp && num >= 0) { 265 TCHECK2(*p, 2); 266 if (p + 2 > endp) 267 goto trunc; 268 pt = p[0]; /* type of "protocol" field */ 269 pl = p[1]; /* length of "protocol" field */ 270 p += 2; 271 272 TCHECK2(p[pl], 2); 273 if (p + pl + 2 > endp) 274 goto trunc; 275 al = EXTRACT_16BITS(&p[pl]); /* address length */ 276 277 if (pt == PT_NLPID && pl == 1 && *p == NLPID_IP && al == 4) { 278 /* 279 * IPv4: protocol type = NLPID, protocol length = 1 280 * (1-byte NLPID), protocol = 0xcc (NLPID for IPv4), 281 * address length = 4 282 */ 283 p += 3; 284 285 TCHECK2(*p, 4); 286 if (p + 4 > endp) 287 goto trunc; 288 printf("IPv4 (%u) %s", 289 num, 290 ipaddr_string(p)); 291 p += 4; 292 } 293 #ifdef INET6 294 else if (pt == PT_IEEE_802_2 && pl == 8 && 295 memcmp(p, prot_ipv6, 8) == 0 && al == 16) { 296 /* 297 * IPv6: protocol type = IEEE 802.2 header, 298 * protocol length = 8 (size of LLC+SNAP header), 299 * protocol = LLC+SNAP header with the IPv6 300 * Ethertype, address length = 16 301 */ 302 p += 10; 303 TCHECK2(*p, al); 304 if (p + al > endp) 305 goto trunc; 306 307 printf("IPv6 (%u) %s", 308 num, 309 ip6addr_string(p)); 310 p += al; 311 } 312 #endif 313 else { 314 /* 315 * Generic case: just print raw data 316 */ 317 TCHECK2(*p, pl); 318 if (p + pl > endp) 319 goto trunc; 320 printf("pt=0x%02x, pl=%d, pb=", *(p - 2), pl); 321 while (pl-- > 0) 322 printf(" %02x", *p++); 323 TCHECK2(*p, 2); 324 if (p + 2 > endp) 325 goto trunc; 326 al = (*p << 8) + *(p + 1); 327 printf(", al=%d, a=", al); 328 p += 2; 329 TCHECK2(*p, al); 330 if (p + al > endp) 331 goto trunc; 332 while (al-- > 0) 333 printf(" %02x", *p++); 334 } 335 num--; 336 if (num) 337 printf(" "); 338 } 339 340 return 0; 341 342 trunc: 343 return -1; 344 } 345 346 347 static int 348 cdp_print_prefixes(const u_char * p, int l) 349 { 350 if (l % 5) 351 goto trunc; 352 353 printf(" IPv4 Prefixes (%d):", l / 5); 354 355 while (l > 0) { 356 printf(" %u.%u.%u.%u/%u", p[0], p[1], p[2], p[3], p[4]); 357 l -= 5; 358 p += 5; 359 } 360 361 return 0; 362 363 trunc: 364 return -1; 365 } 366 367 /* read in a <n>-byte number, MSB first 368 * (of course this can handle max sizeof(long)) 369 */ 370 static unsigned long cdp_get_number(const u_char * p, int l) 371 { 372 unsigned long res=0; 373 while( l>0 ) 374 { 375 res = (res<<8) + *p; 376 p++; l--; 377 } 378 return res; 379 } 380
