1 /* $OpenBSD: print-bootp.c,v 1.22 2015/12/22 21:01:07 mmcc 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 #include <sys/time.h> 26 #include <sys/socket.h> 27 28 struct mbuf; 29 struct rtentry; 30 #include <net/if.h> 31 32 #include <netinet/in.h> 33 #include <netinet/if_ether.h> 34 35 #include <ctype.h> 36 #include <stdio.h> 37 #include <string.h> 38 39 #include "interface.h" 40 #include "addrtoname.h" 41 #include "bootp.h" 42 43 static void rfc1048_print(const u_char *, u_int); 44 static void cmu_print(const u_char *, u_int); 45 46 static char tstr[] = " [|bootp]"; 47 48 /* 49 * Print bootp requests 50 */ 51 void 52 bootp_print(const u_char *cp, u_int length, 53 u_short sport, u_short dport) 54 { 55 const struct bootp *bp; 56 static u_char vm_cmu[4] = VM_CMU; 57 static u_char vm_rfc1048[4] = VM_RFC1048; 58 59 bp = (struct bootp *)cp; 60 TCHECK(bp->bp_op); 61 switch (bp->bp_op) { 62 63 case BOOTREQUEST: 64 /* Usually, a request goes from a client to a server */ 65 if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS) 66 printf(" (request)"); 67 break; 68 69 case BOOTREPLY: 70 /* Usually, a reply goes from a server to a client */ 71 if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC) 72 printf(" (reply)"); 73 break; 74 75 default: 76 printf(" bootp-#%d", bp->bp_op); 77 } 78 79 TCHECK(bp->bp_flags); 80 81 /* The usual hardware address type is 1 (10Mb Ethernet) */ 82 if (bp->bp_htype != 1) 83 printf(" htype-#%d", bp->bp_htype); 84 85 /* The usual length for 10Mb Ethernet address is 6 bytes */ 86 if (bp->bp_htype != 1 || bp->bp_hlen != 6) 87 printf(" hlen:%d", bp->bp_hlen); 88 89 /* Only print interesting fields */ 90 if (bp->bp_hops) 91 printf(" hops:%d", bp->bp_hops); 92 if (bp->bp_xid) 93 printf(" xid:0x%x", (u_int32_t)ntohl(bp->bp_xid)); 94 if (bp->bp_secs) 95 printf(" secs:%d", ntohs(bp->bp_secs)); 96 if (bp->bp_flags) 97 printf(" flags:0x%x", ntohs(bp->bp_flags)); 98 99 /* Client's ip address */ 100 TCHECK(bp->bp_ciaddr); 101 if (bp->bp_ciaddr.s_addr) 102 printf(" C:%s", ipaddr_string(&bp->bp_ciaddr)); 103 104 /* 'your' ip address (bootp client) */ 105 TCHECK(bp->bp_yiaddr); 106 if (bp->bp_yiaddr.s_addr) 107 printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr)); 108 109 /* Server's ip address */ 110 TCHECK(bp->bp_siaddr); 111 if (bp->bp_siaddr.s_addr) 112 printf(" S:%s", ipaddr_string(&bp->bp_siaddr)); 113 114 /* Gateway's ip address */ 115 TCHECK(bp->bp_giaddr); 116 if (bp->bp_giaddr.s_addr) 117 printf(" G:%s", ipaddr_string(&bp->bp_giaddr)); 118 119 /* Client's Ethernet address */ 120 if (bp->bp_htype == 1 && bp->bp_hlen == 6) { 121 const struct ether_header *eh; 122 const char *e; 123 124 TCHECK2(bp->bp_chaddr[0], 6); 125 eh = (struct ether_header *)packetp; 126 if (bp->bp_op == BOOTREQUEST) 127 e = (const char *)ESRC(eh); 128 else if (bp->bp_op == BOOTREPLY) 129 e = (const char *)EDST(eh); 130 else 131 e = NULL; 132 if (e == 0 || memcmp((char *)bp->bp_chaddr, e, 6) != 0) 133 printf(" ether %s", etheraddr_string(bp->bp_chaddr)); 134 } 135 136 TCHECK2(bp->bp_sname[0], 1); /* check first char only */ 137 if (*bp->bp_sname) { 138 printf(" sname \""); 139 if (fn_print(bp->bp_sname, snapend)) { 140 putchar('"'); 141 fputs(tstr + 1, stdout); 142 return; 143 } 144 putchar('"'); 145 } 146 TCHECK2(bp->bp_file[0], 1); /* check first char only */ 147 if (*bp->bp_file) { 148 printf(" file \""); 149 if (fn_print(bp->bp_file, snapend)) { 150 putchar('"'); 151 fputs(tstr + 1, stdout); 152 return; 153 } 154 putchar('"'); 155 } 156 157 /* Decode the vendor buffer */ 158 TCHECK2(bp->bp_vend[0], sizeof(u_int32_t)); 159 length -= sizeof(*bp) - sizeof(bp->bp_vend); 160 if (memcmp((char *)bp->bp_vend, (char *)vm_rfc1048, 161 sizeof(u_int32_t)) == 0) 162 rfc1048_print(bp->bp_vend, length); 163 else if (memcmp((char *)bp->bp_vend, (char *)vm_cmu, 164 sizeof(u_int32_t)) == 0) 165 cmu_print(bp->bp_vend, length); 166 else { 167 u_int32_t ul; 168 169 memcpy((char *)&ul, (char *)bp->bp_vend, sizeof(ul)); 170 if (ul != 0) 171 printf("vend-#0x%x", ul); 172 } 173 174 return; 175 trunc: 176 fputs(tstr, stdout); 177 } 178 179 /* The first character specifies the format to print */ 180 static struct tok tag2str[] = { 181 /* RFC1048 tags */ 182 { TAG_PAD, " PAD" }, 183 { TAG_SUBNET_MASK, "iSM" }, /* subnet mask (RFC950) */ 184 { TAG_TIME_OFFSET, "lTZ" }, /* seconds from UTC */ 185 { TAG_GATEWAY, "iDG" }, /* default gateway */ 186 { TAG_TIME_SERVER, "iTS" }, /* time servers (RFC868) */ 187 { TAG_NAME_SERVER, "iIEN" }, /* IEN name servers (IEN116) */ 188 { TAG_DOMAIN_SERVER, "iNS" }, /* domain name (RFC1035) */ 189 { TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */ 190 { TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */ 191 { TAG_LPR_SERVER, "iLPR" }, /* lpr server (RFC1179) */ 192 { TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */ 193 { TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */ 194 { TAG_HOSTNAME, "aHN" }, /* ascii hostname */ 195 { TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */ 196 { TAG_END, " END" }, 197 /* RFC1497 tags */ 198 { TAG_DUMPPATH, "aDP" }, 199 { TAG_DOMAINNAME, "aDN" }, 200 { TAG_SWAP_SERVER, "iSS" }, 201 { TAG_ROOTPATH, "aRP" }, 202 { TAG_EXTPATH, "aEP" }, 203 /* RFC2132 tags */ 204 { TAG_IP_FORWARD, "BIPF" }, 205 { TAG_NL_SRCRT, "BSRT" }, 206 { TAG_PFILTERS, "pPF" }, 207 { TAG_REASS_SIZE, "sRSZ" }, 208 { TAG_DEF_TTL, "bTTL" }, 209 { TAG_MTU_TIMEOUT, "lMA" }, 210 { TAG_MTU_TABLE, "sMT" }, 211 { TAG_INT_MTU, "sMTU" }, 212 { TAG_LOCAL_SUBNETS, "BLSN" }, 213 { TAG_BROAD_ADDR, "iBR" }, 214 { TAG_DO_MASK_DISC, "BMD" }, 215 { TAG_SUPPLY_MASK, "BMS" }, 216 { TAG_DO_RDISC, "BRD" }, 217 { TAG_RTR_SOL_ADDR, "iRSA" }, 218 { TAG_STATIC_ROUTE, "pSR" }, 219 { TAG_USE_TRAILERS, "BUT" }, 220 { TAG_ARP_TIMEOUT, "lAT" }, 221 { TAG_ETH_ENCAP, "BIE" }, 222 { TAG_TCP_TTL, "bTT" }, 223 { TAG_TCP_KEEPALIVE, "lKI" }, 224 { TAG_KEEPALIVE_GO, "BKG" }, 225 { TAG_NIS_DOMAIN, "aYD" }, 226 { TAG_NIS_SERVERS, "iYS" }, 227 { TAG_NTP_SERVERS, "iNTP" }, 228 { TAG_VENDOR_OPTS, "bVO" }, 229 { TAG_NETBIOS_NS, "iWNS" }, 230 { TAG_NETBIOS_DDS, "iWDD" }, 231 { TAG_NETBIOS_NODE, "bWNT" }, 232 { TAG_NETBIOS_SCOPE, "aWSC" }, 233 { TAG_XWIN_FS, "iXFS" }, 234 { TAG_XWIN_DM, "iXDM" }, 235 { TAG_NIS_P_DOMAIN, "sN+D" }, 236 { TAG_NIS_P_SERVERS, "iN+S" }, 237 { TAG_MOBILE_HOME, "iMH" }, 238 { TAG_SMPT_SERVER, "iSMTP" }, 239 { TAG_POP3_SERVER, "iPOP3" }, 240 { TAG_NNTP_SERVER, "iNNTP" }, 241 { TAG_WWW_SERVER, "iWWW" }, 242 { TAG_FINGER_SERVER, "iFG" }, 243 { TAG_IRC_SERVER, "iIRC" }, 244 { TAG_STREETTALK_SRVR, "iSTS" }, 245 { TAG_STREETTALK_STDA, "iSTDA" }, 246 { TAG_REQUESTED_IP, "iRQ" }, 247 { TAG_IP_LEASE, "lLT" }, 248 { TAG_OPT_OVERLOAD, "bOO" }, 249 { TAG_TFTP_SERVER, "aTFTP" }, 250 { TAG_BOOTFILENAME, "aBF" }, 251 { TAG_DHCP_MESSAGE, " DHCP" }, 252 { TAG_SERVER_ID, "iSID" }, 253 { TAG_PARM_REQUEST, "bPR" }, 254 { TAG_MESSAGE, "aMSG" }, 255 { TAG_MAX_MSG_SIZE, "sMSZ" }, 256 { TAG_RENEWAL_TIME, "lRN" }, 257 { TAG_REBIND_TIME, "lRB" }, 258 { TAG_VENDOR_CLASS, "bVC" }, 259 { TAG_CLIENT_ID, "bCID" }, 260 { 0, NULL } 261 }; 262 263 static void 264 rfc1048_print(const u_char *bp, u_int length) 265 { 266 u_char tag; 267 u_int len, size; 268 const char *cp; 269 u_char c; 270 int first; 271 u_int32_t ul; 272 u_short us; 273 274 printf(" vend-rfc1048"); 275 276 /* Step over magic cookie */ 277 bp += sizeof(int32_t); 278 279 /* Loop while we there is a tag left in the buffer */ 280 while (bp + 1 < snapend) { 281 tag = *bp++; 282 if (tag == TAG_PAD) 283 continue; 284 if (tag == TAG_END) 285 return; 286 cp = tok2str(tag2str, "?T%d", tag); 287 c = *cp++; 288 printf(" %s:", cp); 289 290 /* Get the length; check for truncation */ 291 if (bp + 1 >= snapend) { 292 fputs(tstr, stdout); 293 return; 294 } 295 len = *bp++; 296 if (bp + len >= snapend) { 297 fputs(tstr, stdout); 298 return; 299 } 300 301 if (tag == TAG_DHCP_MESSAGE && len == 1) { 302 c = *bp++; 303 switch (c) { 304 case DHCPDISCOVER: printf("DISCOVER"); break; 305 case DHCPOFFER: printf("OFFER"); break; 306 case DHCPREQUEST: printf("REQUEST"); break; 307 case DHCPDECLINE: printf("DECLINE"); break; 308 case DHCPACK: printf("ACK"); break; 309 case DHCPNAK: printf("NACK"); break; 310 case DHCPRELEASE: printf("RELEASE"); break; 311 case DHCPINFORM: printf("INFORM"); break; 312 default: printf("%u", c); break; 313 } 314 continue; 315 } 316 317 if (tag == TAG_PARM_REQUEST) { 318 first = 1; 319 while (len-- > 0) { 320 c = *bp++; 321 cp = tok2str(tag2str, "?%d", c); 322 if (!first) 323 putchar('+'); 324 printf("%s", cp + 1); 325 first = 0; 326 } 327 continue; 328 } 329 330 /* Print data */ 331 size = len; 332 if (c == '?') { 333 /* Base default formats for unknown tags on data size */ 334 if (size & 1) 335 c = 'b'; 336 else if (size & 2) 337 c = 's'; 338 else 339 c = 'l'; 340 } 341 first = 1; 342 switch (c) { 343 344 case 'a': 345 /* ascii strings */ 346 putchar('"'); 347 (void)fn_printn(bp, size, NULL); 348 putchar('"'); 349 bp += size; 350 size = 0; 351 break; 352 353 case 'i': 354 case 'l': 355 /* ip addresses/32-bit words */ 356 while (size >= sizeof(ul)) { 357 if (!first) 358 putchar(','); 359 memcpy((char *)&ul, (char *)bp, sizeof(ul)); 360 if (c == 'i') 361 printf("%s", ipaddr_string(&ul)); 362 else 363 printf("%u", ntohl(ul)); 364 bp += sizeof(ul); 365 size -= sizeof(ul); 366 first = 0; 367 } 368 break; 369 370 case 'p': 371 /* IP address pairs */ 372 while (size >= 2*sizeof(ul)) { 373 if (!first) 374 putchar(','); 375 memcpy((char *)&ul, (char *)bp, sizeof(ul)); 376 printf("(%s:", ipaddr_string(&ul)); 377 bp += sizeof(ul); 378 memcpy((char *)&ul, (char *)bp, sizeof(ul)); 379 printf("%s)", ipaddr_string(&ul)); 380 bp += sizeof(ul); 381 size -= 2*sizeof(ul); 382 first = 0; 383 } 384 break; 385 386 case 's': 387 /* shorts */ 388 while (size >= sizeof(us)) { 389 if (!first) 390 putchar(','); 391 memcpy((char *)&us, (char *)bp, sizeof(us)); 392 printf("%u", ntohs(us)); 393 bp += sizeof(us); 394 size -= sizeof(us); 395 first = 0; 396 } 397 break; 398 399 case 'B': 400 /* boolean */ 401 while (size > 0) { 402 if (!first) 403 putchar(','); 404 switch (*bp) { 405 case 0: 406 putchar('N'); 407 break; 408 case 1: 409 putchar('Y'); 410 break; 411 default: 412 printf("%d?", *bp); 413 break; 414 } 415 ++bp; 416 --size; 417 first = 0; 418 } 419 break; 420 421 case 'b': 422 default: 423 /* Bytes */ 424 while (size > 0) { 425 if (!first) 426 putchar('.'); 427 printf("%d", *bp); 428 ++bp; 429 --size; 430 first = 0; 431 } 432 break; 433 } 434 /* Data left over? */ 435 if (size) 436 printf("[len %d]", len); 437 } 438 } 439 440 static void 441 cmu_print(const u_char *bp, u_int length) 442 { 443 const struct cmu_vend *cmu; 444 static const char fmt[] = " %s:%s"; 445 446 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \ 447 if (cmu->m.s_addr != 0) \ 448 printf(fmt, s, ipaddr_string(&cmu->m.s_addr)); } 449 450 printf(" vend-cmu"); 451 cmu = (struct cmu_vend *)bp; 452 453 /* Only print if there are unknown bits */ 454 TCHECK(cmu->v_flags); 455 if ((cmu->v_flags & ~(VF_SMASK)) != 0) 456 printf(" F:0x%x", cmu->v_flags); 457 PRINTCMUADDR(v_dgate, "DG"); 458 PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*"); 459 PRINTCMUADDR(v_dns1, "NS1"); 460 PRINTCMUADDR(v_dns2, "NS2"); 461 PRINTCMUADDR(v_ins1, "IEN1"); 462 PRINTCMUADDR(v_ins2, "IEN2"); 463 PRINTCMUADDR(v_ts1, "TS1"); 464 PRINTCMUADDR(v_ts2, "TS2"); 465 return; 466 467 trunc: 468 fputs(tstr, stdout); 469 #undef PRINTCMUADDR 470 } 471