1 /* $OpenBSD: print-bootp.c,v 1.11 2000/10/03 14:31:56 ho Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 * 23 * Format and print bootp packets. 24 */ 25 #ifndef lint 26 static const char rcsid[] = 27 "@(#) $Header: /home/cvs/src/usr.sbin/tcpdump/print-bootp.c,v 1.11 2000/10/03 14:31:56 ho Exp $ (LBL)"; 28 #endif 29 30 #include <sys/param.h> 31 #include <sys/time.h> 32 #include <sys/socket.h> 33 34 #ifdef __STDC__ 35 struct mbuf; 36 struct rtentry; 37 #endif 38 #include <net/if.h> 39 40 #include <netinet/in.h> 41 #include <netinet/if_ether.h> 42 43 #include <ctype.h> 44 #include <memory.h> 45 #include <stdio.h> 46 #include <string.h> 47 48 #include "interface.h" 49 #include "addrtoname.h" 50 #include "bootp.h" 51 52 static void rfc1048_print(const u_char *, u_int); 53 static void cmu_print(const u_char *, u_int); 54 55 static char tstr[] = " [|bootp]"; 56 57 /* 58 * Print bootp requests 59 */ 60 void 61 bootp_print(register const u_char *cp, u_int length, 62 u_short sport, u_short dport) 63 { 64 register const struct bootp *bp; 65 static u_char vm_cmu[4] = VM_CMU; 66 static u_char vm_rfc1048[4] = VM_RFC1048; 67 68 bp = (struct bootp *)cp; 69 TCHECK(bp->bp_op); 70 switch (bp->bp_op) { 71 72 case BOOTREQUEST: 73 /* Usually, a request goes from a client to a server */ 74 if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS) 75 printf(" (request)"); 76 break; 77 78 case BOOTREPLY: 79 /* Usually, a reply goes from a server to a client */ 80 if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC) 81 printf(" (reply)"); 82 break; 83 84 default: 85 printf(" bootp-#%d", bp->bp_op); 86 } 87 88 TCHECK(bp->bp_secs); 89 90 /* The usual hardware address type is 1 (10Mb Ethernet) */ 91 if (bp->bp_htype != 1) 92 printf(" htype-#%d", bp->bp_htype); 93 94 /* The usual length for 10Mb Ethernet address is 6 bytes */ 95 if (bp->bp_htype != 1 || bp->bp_hlen != 6) 96 printf(" hlen:%d", bp->bp_hlen); 97 98 /* Only print interesting fields */ 99 if (bp->bp_hops) 100 printf(" hops:%d", bp->bp_hops); 101 if (bp->bp_xid) 102 printf(" xid:0x%x", (u_int32_t)ntohl(bp->bp_xid)); 103 if (bp->bp_secs) 104 printf(" secs:%d", ntohs(bp->bp_secs)); 105 if (bp->bp_flags) 106 printf(" flags:0x%x", ntohs(bp->bp_flags)); 107 108 /* Client's ip address */ 109 TCHECK(bp->bp_ciaddr); 110 if (bp->bp_ciaddr.s_addr) 111 printf(" C:%s", ipaddr_string(&bp->bp_ciaddr)); 112 113 /* 'your' ip address (bootp client) */ 114 TCHECK(bp->bp_yiaddr); 115 if (bp->bp_yiaddr.s_addr) 116 printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr)); 117 118 /* Server's ip address */ 119 TCHECK(bp->bp_siaddr); 120 if (bp->bp_siaddr.s_addr) 121 printf(" S:%s", ipaddr_string(&bp->bp_siaddr)); 122 123 /* Gateway's ip address */ 124 TCHECK(bp->bp_giaddr); 125 if (bp->bp_giaddr.s_addr) 126 printf(" G:%s", ipaddr_string(&bp->bp_giaddr)); 127 128 /* Client's Ethernet address */ 129 if (bp->bp_htype == 1 && bp->bp_hlen == 6) { 130 register const struct ether_header *eh; 131 register const char *e; 132 133 TCHECK2(bp->bp_chaddr[0], 6); 134 eh = (struct ether_header *)packetp; 135 if (bp->bp_op == BOOTREQUEST) 136 e = (const char *)ESRC(eh); 137 else if (bp->bp_op == BOOTREPLY) 138 e = (const char *)EDST(eh); 139 else 140 e = 0; 141 if (e == 0 || memcmp((char *)bp->bp_chaddr, e, 6) != 0) 142 printf(" ether %s", etheraddr_string(bp->bp_chaddr)); 143 } 144 145 TCHECK2(bp->bp_sname[0], 1); /* check first char only */ 146 if (*bp->bp_sname) { 147 printf(" sname \""); 148 if (fn_print(bp->bp_sname, snapend)) { 149 putchar('"'); 150 fputs(tstr + 1, stdout); 151 return; 152 } 153 putchar('"'); 154 } 155 TCHECK2(bp->bp_sname[0], 1); /* check first char only */ 156 if (*bp->bp_file) { 157 printf(" file \""); 158 if (fn_print(bp->bp_file, snapend)) { 159 putchar('"'); 160 fputs(tstr + 1, stdout); 161 return; 162 } 163 putchar('"'); 164 } 165 166 /* Decode the vendor buffer */ 167 TCHECK(bp->bp_vend[0]); 168 length -= sizeof(*bp) - sizeof(bp->bp_vend); 169 if (memcmp((char *)bp->bp_vend, (char *)vm_rfc1048, 170 sizeof(u_int32_t)) == 0) 171 rfc1048_print(bp->bp_vend, length); 172 else if (memcmp((char *)bp->bp_vend, (char *)vm_cmu, 173 sizeof(u_int32_t)) == 0) 174 cmu_print(bp->bp_vend, length); 175 else { 176 u_int32_t ul; 177 178 memcpy((char *)&ul, (char *)bp->bp_vend, sizeof(ul)); 179 if (ul != 0) 180 printf("vend-#0x%x", ul); 181 } 182 183 return; 184 trunc: 185 fputs(tstr, stdout); 186 } 187 188 /* The first character specifies the format to print */ 189 static struct tok tag2str[] = { 190 /* RFC1048 tags */ 191 { TAG_PAD, " PAD" }, 192 { TAG_SUBNET_MASK, "iSM" }, /* subnet mask (RFC950) */ 193 { TAG_TIME_OFFSET, "lTZ" }, /* seconds from UTC */ 194 { TAG_GATEWAY, "iDG" }, /* default gateway */ 195 { TAG_TIME_SERVER, "iTS" }, /* time servers (RFC868) */ 196 { TAG_NAME_SERVER, "iIEN" }, /* IEN name servers (IEN116) */ 197 { TAG_DOMAIN_SERVER, "iNS" }, /* domain name (RFC1035) */ 198 { TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */ 199 { TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */ 200 { TAG_LPR_SERVER, "iLPR" }, /* lpr server (RFC1179) */ 201 { TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */ 202 { TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */ 203 { TAG_HOSTNAME, "aHN" }, /* ascii hostname */ 204 { TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */ 205 { TAG_END, " END" }, 206 /* RFC1497 tags */ 207 { TAG_DUMPPATH, "aDP" }, 208 { TAG_DOMAINNAME, "aDN" }, 209 { TAG_SWAP_SERVER, "iSS" }, 210 { TAG_ROOTPATH, "aRP" }, 211 { TAG_EXTPATH, "aEP" }, 212 /* RFC2132 tags */ 213 { TAG_IP_FORWARD, "BIPF" }, 214 { TAG_NL_SRCRT, "BSRT" }, 215 { TAG_PFILTERS, "pPF" }, 216 { TAG_REASS_SIZE, "sRSZ" }, 217 { TAG_DEF_TTL, "bTTL" }, 218 { TAG_MTU_TIMEOUT, "lMA" }, 219 { TAG_MTU_TABLE, "sMT" }, 220 { TAG_INT_MTU, "sMTU" }, 221 { TAG_LOCAL_SUBNETS, "BLSN" }, 222 { TAG_BROAD_ADDR, "iBR" }, 223 { TAG_DO_MASK_DISC, "BMD" }, 224 { TAG_SUPPLY_MASK, "BMS" }, 225 { TAG_DO_RDISC, "BRD" }, 226 { TAG_RTR_SOL_ADDR, "iRSA" }, 227 { TAG_STATIC_ROUTE, "pSR" }, 228 { TAG_USE_TRAILERS, "BUT" }, 229 { TAG_ARP_TIMEOUT, "lAT" }, 230 { TAG_ETH_ENCAP, "BIE" }, 231 { TAG_TCP_TTL, "bTT" }, 232 { TAG_TCP_KEEPALIVE, "lKI" }, 233 { TAG_KEEPALIVE_GO, "BKG" }, 234 { TAG_NIS_DOMAIN, "aYD" }, 235 { TAG_NIS_SERVERS, "iYS" }, 236 { TAG_NTP_SERVERS, "iNTP" }, 237 { TAG_VENDOR_OPTS, "bVO" }, 238 { TAG_NETBIOS_NS, "iWNS" }, 239 { TAG_NETBIOS_DDS, "iWDD" }, 240 { TAG_NETBIOS_NODE, "bWNT" }, 241 { TAG_NETBIOS_SCOPE, "aWSC" }, 242 { TAG_XWIN_FS, "iXFS" }, 243 { TAG_XWIN_DM, "iXDM" }, 244 { TAG_NIS_P_DOMAIN, "sN+D" }, 245 { TAG_NIS_P_SERVERS, "iN+S" }, 246 { TAG_MOBILE_HOME, "iMH" }, 247 { TAG_SMPT_SERVER, "iSMTP" }, 248 { TAG_POP3_SERVER, "iPOP3" }, 249 { TAG_NNTP_SERVER, "iNNTP" }, 250 { TAG_WWW_SERVER, "iWWW" }, 251 { TAG_FINGER_SERVER, "iFG" }, 252 { TAG_IRC_SERVER, "iIRC" }, 253 { TAG_STREETTALK_SRVR, "iSTS" }, 254 { TAG_STREETTALK_STDA, "iSTDA" }, 255 { TAG_REQUESTED_IP, "iRQ" }, 256 { TAG_IP_LEASE, "lLT" }, 257 { TAG_OPT_OVERLOAD, "bOO" }, 258 { TAG_TFTP_SERVER, "aTFTP" }, 259 { TAG_BOOTFILENAME, "aBF" }, 260 { TAG_DHCP_MESSAGE, " DHCP" }, 261 { TAG_SERVER_ID, "iSID" }, 262 { TAG_PARM_REQUEST, "bPR" }, 263 { TAG_MESSAGE, "aMSG" }, 264 { TAG_MAX_MSG_SIZE, "sMSZ" }, 265 { TAG_RENEWAL_TIME, "lRN" }, 266 { TAG_REBIND_TIME, "lRB" }, 267 { TAG_VENDOR_CLASS, "bVC" }, 268 { TAG_CLIENT_ID, "bCID" }, 269 { 0, NULL } 270 }; 271 272 static void 273 rfc1048_print(register const u_char *bp, register u_int length) 274 { 275 register u_char tag; 276 register u_int len, size; 277 register const char *cp; 278 register char c; 279 int first; 280 u_int32_t ul; 281 u_short us; 282 283 printf(" vend-rfc1048"); 284 285 /* Step over magic cookie */ 286 bp += sizeof(int32_t); 287 288 /* Loop while we there is a tag left in the buffer */ 289 while (bp + 1 < snapend) { 290 tag = *bp++; 291 if (tag == TAG_PAD) 292 continue; 293 if (tag == TAG_END) 294 return; 295 cp = tok2str(tag2str, "?T%d", tag); 296 c = *cp++; 297 printf(" %s:", cp); 298 299 /* Get the length; check for truncation */ 300 if (bp + 1 >= snapend) { 301 fputs(tstr, stdout); 302 return; 303 } 304 len = *bp++; 305 if (bp + len >= snapend) { 306 fputs(tstr, stdout); 307 return; 308 } 309 310 if (tag == TAG_DHCP_MESSAGE && len == 1) { 311 c = *bp++; 312 switch (c) { 313 case DHCPDISCOVER: printf("DISCOVER"); break; 314 case DHCPOFFER: printf("OFFER"); break; 315 case DHCPREQUEST: printf("REQUEST"); break; 316 case DHCPDECLINE: printf("DECLINE"); break; 317 case DHCPACK: printf("ACK"); break; 318 case DHCPNAK: printf("NACK"); break; 319 case DHCPRELEASE: printf("RELEASE"); break; 320 case DHCPINFORM: printf("INFORM"); break; 321 default: printf("%u", c); break; 322 } 323 continue; 324 } 325 326 if (tag == TAG_PARM_REQUEST) { 327 first = 1; 328 while (len-- > 0) { 329 c = *bp++; 330 cp = tok2str(tag2str, "?%d", c); 331 if (!first) 332 putchar('+'); 333 printf("%s", cp + 1); 334 first = 0; 335 } 336 continue; 337 } 338 339 /* Print data */ 340 size = len; 341 if (c == '?') { 342 /* Base default formats for unknown tags on data size */ 343 if (size & 1) 344 c = 'b'; 345 else if (size & 2) 346 c = 's'; 347 else 348 c = 'l'; 349 } 350 first = 1; 351 switch (c) { 352 353 case 'a': 354 /* ascii strings */ 355 putchar('"'); 356 (void)fn_printn(bp, size, NULL); 357 putchar('"'); 358 bp += size; 359 size = 0; 360 break; 361 362 case 'i': 363 case 'l': 364 /* ip addresses/32-bit words */ 365 while (size >= sizeof(ul)) { 366 if (!first) 367 putchar(','); 368 memcpy((char *)&ul, (char *)bp, sizeof(ul)); 369 if (c == 'i') 370 printf("%s", ipaddr_string(&ul)); 371 else 372 printf("%u", ul); 373 bp += sizeof(ul); 374 size -= sizeof(ul); 375 first = 0; 376 } 377 break; 378 379 case 'p': 380 /* IP address pairs */ 381 while (size >= 2*sizeof(ul)) { 382 if (!first) 383 putchar(','); 384 memcpy((char *)&ul, (char *)bp, sizeof(ul)); 385 printf("(%s:", ipaddr_string(&ul)); 386 bp += sizeof(ul); 387 memcpy((char *)&ul, (char *)bp, sizeof(ul)); 388 printf("%s)", ipaddr_string(&ul)); 389 bp += sizeof(ul); 390 size -= 2*sizeof(ul); 391 first = 0; 392 } 393 break; 394 395 case 's': 396 /* shorts */ 397 while (size >= sizeof(us)) { 398 if (!first) 399 putchar(','); 400 memcpy((char *)&us, (char *)bp, sizeof(us)); 401 printf("%d", us); 402 bp += sizeof(us); 403 size -= sizeof(us); 404 first = 0; 405 } 406 break; 407 408 case 'B': 409 /* boolean */ 410 while (size > 0) { 411 if (!first) 412 putchar(','); 413 switch (*bp) { 414 case 0: 415 putchar('N'); 416 break; 417 case 1: 418 putchar('Y'); 419 break; 420 default: 421 printf("%d?", *bp); 422 break; 423 } 424 ++bp; 425 --size; 426 first = 0; 427 } 428 break; 429 430 case 'b': 431 default: 432 /* Bytes */ 433 while (size > 0) { 434 if (!first) 435 putchar('.'); 436 printf("%d", *bp); 437 ++bp; 438 --size; 439 first = 0; 440 } 441 break; 442 } 443 /* Data left over? */ 444 if (size) 445 printf("[len %d]", len); 446 } 447 } 448 449 static void 450 cmu_print(register const u_char *bp, register u_int length) 451 { 452 register const struct cmu_vend *cmu; 453 char *fmt = " %s:%s"; 454 455 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \ 456 if (cmu->m.s_addr != 0) \ 457 printf(fmt, s, ipaddr_string(&cmu->m.s_addr)); } 458 459 printf(" vend-cmu"); 460 cmu = (struct cmu_vend *)bp; 461 462 /* Only print if there are unknown bits */ 463 TCHECK(cmu->v_flags); 464 if ((cmu->v_flags & ~(VF_SMASK)) != 0) 465 printf(" F:0x%x", cmu->v_flags); 466 PRINTCMUADDR(v_dgate, "DG"); 467 PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*"); 468 PRINTCMUADDR(v_dns1, "NS1"); 469 PRINTCMUADDR(v_dns2, "NS2"); 470 PRINTCMUADDR(v_ins1, "IEN1"); 471 PRINTCMUADDR(v_ins2, "IEN2"); 472 PRINTCMUADDR(v_ts1, "TS1"); 473 PRINTCMUADDR(v_ts2, "TS2"); 474 return; 475 476 trunc: 477 fputs(tstr, stdout); 478 #undef PRINTCMUADDR 479 } 480