1 /* 2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 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 * Name to id translation routines used by the scanner. 22 * These functions are not time critical. 23 * 24 * $FreeBSD$ 25 */ 26 27 #ifndef lint 28 static const char rcsid[] _U_ = 29 "@(#) $Header: /tcpdump/master/libpcap/nametoaddr.c,v 1.77.2.4 2007/06/11 09:52:05 guy Exp $ (LBL)"; 30 #endif 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #ifdef WIN32 37 #include <pcap-stdinc.h> 38 39 #else /* WIN32 */ 40 41 #include <sys/param.h> 42 #include <sys/types.h> /* concession to AIX */ 43 #include <sys/socket.h> 44 #include <sys/time.h> 45 46 #include <netinet/in.h> 47 #endif /* WIN32 */ 48 49 /* 50 * XXX - why was this included even on UNIX? 51 */ 52 #ifdef __MINGW32__ 53 #include "IP6_misc.h" 54 #endif 55 56 #ifndef WIN32 57 #ifdef HAVE_ETHER_HOSTTON 58 /* 59 * XXX - do we need any of this if <netinet/if_ether.h> doesn't declare 60 * ether_hostton()? 61 */ 62 #ifdef HAVE_NETINET_IF_ETHER_H 63 struct mbuf; /* Squelch compiler warnings on some platforms for */ 64 struct rtentry; /* declarations in <net/if.h> */ 65 #include <net/if.h> /* for "struct ifnet" in "struct arpcom" on Solaris */ 66 #include <netinet/if_ether.h> 67 #endif /* HAVE_NETINET_IF_ETHER_H */ 68 #ifdef NETINET_ETHER_H_DECLARES_ETHER_HOSTTON 69 #include <netinet/ether.h> 70 #endif /* NETINET_ETHER_H_DECLARES_ETHER_HOSTTON */ 71 #endif /* HAVE_ETHER_HOSTTON */ 72 #include <arpa/inet.h> 73 #include <netdb.h> 74 #endif /* WIN32 */ 75 76 #include <ctype.h> 77 #include <errno.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <stdio.h> 81 82 #include "pcap-int.h" 83 84 #include "gencode.h" 85 #include <pcap-namedb.h> 86 87 #ifdef HAVE_OS_PROTO_H 88 #include "os-proto.h" 89 #endif 90 91 #ifndef NTOHL 92 #define NTOHL(x) (x) = ntohl(x) 93 #define NTOHS(x) (x) = ntohs(x) 94 #endif 95 96 static inline int xdtoi(int); 97 98 /* 99 * Convert host name to internet address. 100 * Return 0 upon failure. 101 */ 102 bpf_u_int32 ** 103 pcap_nametoaddr(const char *name) 104 { 105 #ifndef h_addr 106 static bpf_u_int32 *hlist[2]; 107 #endif 108 bpf_u_int32 **p; 109 struct hostent *hp; 110 111 if ((hp = gethostbyname(name)) != NULL) { 112 #ifndef h_addr 113 hlist[0] = (bpf_u_int32 *)hp->h_addr; 114 NTOHL(hp->h_addr); 115 return hlist; 116 #else 117 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p) 118 NTOHL(**p); 119 return (bpf_u_int32 **)hp->h_addr_list; 120 #endif 121 } 122 else 123 return 0; 124 } 125 126 #ifdef INET6 127 struct addrinfo * 128 pcap_nametoaddrinfo(const char *name) 129 { 130 struct addrinfo hints, *res; 131 int error; 132 133 memset(&hints, 0, sizeof(hints)); 134 hints.ai_family = PF_UNSPEC; 135 hints.ai_socktype = SOCK_STREAM; /*not really*/ 136 hints.ai_protocol = IPPROTO_TCP; /*not really*/ 137 error = getaddrinfo(name, NULL, &hints, &res); 138 if (error) 139 return NULL; 140 else 141 return res; 142 } 143 #endif /*INET6*/ 144 145 /* 146 * Convert net name to internet address. 147 * Return 0 upon failure. 148 */ 149 bpf_u_int32 150 pcap_nametonetaddr(const char *name) 151 { 152 #ifndef WIN32 153 struct netent *np; 154 155 if ((np = getnetbyname(name)) != NULL) 156 return np->n_net; 157 else 158 return 0; 159 #else 160 /* 161 * There's no "getnetbyname()" on Windows. 162 */ 163 return 0; 164 #endif 165 } 166 167 /* 168 * Convert a port name to its port and protocol numbers. 169 * We assume only TCP or UDP. 170 * Return 0 upon failure. 171 */ 172 int 173 pcap_nametoport(const char *name, int *port, int *proto) 174 { 175 struct servent *sp; 176 int tcp_port = -1; 177 int udp_port = -1; 178 179 /* 180 * We need to check /etc/services for ambiguous entries. 181 * If we find the ambiguous entry, and it has the 182 * same port number, change the proto to PROTO_UNDEF 183 * so both TCP and UDP will be checked. 184 */ 185 sp = getservbyname(name, "tcp"); 186 if (sp != NULL) tcp_port = ntohs(sp->s_port); 187 sp = getservbyname(name, "udp"); 188 if (sp != NULL) udp_port = ntohs(sp->s_port); 189 if (tcp_port >= 0) { 190 *port = tcp_port; 191 *proto = IPPROTO_TCP; 192 if (udp_port >= 0) { 193 if (udp_port == tcp_port) 194 *proto = PROTO_UNDEF; 195 #ifdef notdef 196 else 197 /* Can't handle ambiguous names that refer 198 to different port numbers. */ 199 warning("ambiguous port %s in /etc/services", 200 name); 201 #endif 202 } 203 return 1; 204 } 205 if (udp_port >= 0) { 206 *port = udp_port; 207 *proto = IPPROTO_UDP; 208 return 1; 209 } 210 #if defined(ultrix) || defined(__osf__) 211 /* Special hack in case NFS isn't in /etc/services */ 212 if (strcmp(name, "nfs") == 0) { 213 *port = 2049; 214 *proto = PROTO_UNDEF; 215 return 1; 216 } 217 #endif 218 return 0; 219 } 220 221 /* 222 * Convert a string in the form PPP-PPP, where correspond to ports, to 223 * a starting and ending port in a port range. 224 * Return 0 on failure. 225 */ 226 int 227 pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto) 228 { 229 u_int p1, p2; 230 char *off, *cpy; 231 int save_proto; 232 233 if (sscanf(name, "%d-%d", &p1, &p2) != 2) { 234 if ((cpy = strdup(name)) == NULL) 235 return 0; 236 237 if ((off = strchr(cpy, '-')) == NULL) { 238 free(cpy); 239 return 0; 240 } 241 242 *off = '\0'; 243 244 if (pcap_nametoport(cpy, port1, proto) == 0) { 245 free(cpy); 246 return 0; 247 } 248 save_proto = *proto; 249 250 if (pcap_nametoport(off + 1, port2, proto) == 0) { 251 free(cpy); 252 return 0; 253 } 254 255 if (*proto != save_proto) 256 *proto = PROTO_UNDEF; 257 } else { 258 *port1 = p1; 259 *port2 = p2; 260 *proto = PROTO_UNDEF; 261 } 262 263 return 1; 264 } 265 266 int 267 pcap_nametoproto(const char *str) 268 { 269 struct protoent *p; 270 271 p = getprotobyname(str); 272 if (p != 0) 273 return p->p_proto; 274 else 275 return PROTO_UNDEF; 276 } 277 278 #include "ethertype.h" 279 280 struct eproto { 281 const char *s; 282 u_short p; 283 }; 284 285 /* Static data base of ether protocol types. */ 286 struct eproto eproto_db[] = { 287 #if 0 288 /* The FreeBSD elf linker generates a request to copy this array 289 * (including its size) when you link with -lpcap. In order to 290 * not bump the major version number of this libpcap.so, we need 291 * to ensure that the array stays the same size. Since PUP is 292 * likely never seen in real life any more, it's the first to 293 * be sacrificed (in favor of ip6). 294 */ 295 { "pup", ETHERTYPE_PUP }, 296 #endif 297 { "xns", ETHERTYPE_NS }, 298 { "ip", ETHERTYPE_IP }, 299 #ifdef INET6 300 { "ip6", ETHERTYPE_IPV6 }, 301 #endif 302 { "arp", ETHERTYPE_ARP }, 303 { "rarp", ETHERTYPE_REVARP }, 304 { "sprite", ETHERTYPE_SPRITE }, 305 { "mopdl", ETHERTYPE_MOPDL }, 306 { "moprc", ETHERTYPE_MOPRC }, 307 { "decnet", ETHERTYPE_DN }, 308 { "lat", ETHERTYPE_LAT }, 309 { "sca", ETHERTYPE_SCA }, 310 { "lanbridge", ETHERTYPE_LANBRIDGE }, 311 { "vexp", ETHERTYPE_VEXP }, 312 { "vprod", ETHERTYPE_VPROD }, 313 { "atalk", ETHERTYPE_ATALK }, 314 { "atalkarp", ETHERTYPE_AARP }, 315 { "loopback", ETHERTYPE_LOOPBACK }, 316 { "decdts", ETHERTYPE_DECDTS }, 317 { "decdns", ETHERTYPE_DECDNS }, 318 { (char *)0, 0 } 319 }; 320 321 int 322 pcap_nametoeproto(const char *s) 323 { 324 struct eproto *p = eproto_db; 325 326 while (p->s != 0) { 327 if (strcmp(p->s, s) == 0) 328 return p->p; 329 p += 1; 330 } 331 return PROTO_UNDEF; 332 } 333 334 #include "llc.h" 335 336 /* Static data base of LLC values. */ 337 static struct eproto llc_db[] = { 338 { "iso", LLCSAP_ISONS }, 339 { "stp", LLCSAP_8021D }, 340 { "ipx", LLCSAP_IPX }, 341 { "netbeui", LLCSAP_NETBEUI }, 342 { (char *)0, 0 } 343 }; 344 345 int 346 pcap_nametollc(const char *s) 347 { 348 struct eproto *p = llc_db; 349 350 while (p->s != 0) { 351 if (strcmp(p->s, s) == 0) 352 return p->p; 353 p += 1; 354 } 355 return PROTO_UNDEF; 356 } 357 358 /* Hex digit to integer. */ 359 static inline int 360 xdtoi(c) 361 register int c; 362 { 363 if (isdigit(c)) 364 return c - '0'; 365 else if (islower(c)) 366 return c - 'a' + 10; 367 else 368 return c - 'A' + 10; 369 } 370 371 int 372 __pcap_atoin(const char *s, bpf_u_int32 *addr) 373 { 374 u_int n; 375 int len; 376 377 *addr = 0; 378 len = 0; 379 while (1) { 380 n = 0; 381 while (*s && *s != '.') 382 n = n * 10 + *s++ - '0'; 383 *addr <<= 8; 384 *addr |= n & 0xff; 385 len += 8; 386 if (*s == '\0') 387 return len; 388 ++s; 389 } 390 /* NOTREACHED */ 391 } 392 393 int 394 __pcap_atodn(const char *s, bpf_u_int32 *addr) 395 { 396 #define AREASHIFT 10 397 #define AREAMASK 0176000 398 #define NODEMASK 01777 399 400 u_int node, area; 401 402 if (sscanf(s, "%d.%d", &area, &node) != 2) 403 bpf_error("malformed decnet address '%s'", s); 404 405 *addr = (area << AREASHIFT) & AREAMASK; 406 *addr |= (node & NODEMASK); 407 408 return(32); 409 } 410 411 /* 412 * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new 413 * ethernet address. Assumes 's' is well formed. 414 */ 415 u_char * 416 pcap_ether_aton(const char *s) 417 { 418 register u_char *ep, *e; 419 register u_int d; 420 421 e = ep = (u_char *)malloc(6); 422 423 while (*s) { 424 if (*s == ':') 425 s += 1; 426 d = xdtoi(*s++); 427 if (isxdigit((unsigned char)*s)) { 428 d <<= 4; 429 d |= xdtoi(*s++); 430 } 431 *ep++ = d; 432 } 433 434 return (e); 435 } 436 437 #ifndef HAVE_ETHER_HOSTTON 438 /* Roll our own */ 439 u_char * 440 pcap_ether_hostton(const char *name) 441 { 442 register struct pcap_etherent *ep; 443 register u_char *ap; 444 static FILE *fp = NULL; 445 static int init = 0; 446 447 if (!init) { 448 fp = fopen(PCAP_ETHERS_FILE, "r"); 449 ++init; 450 if (fp == NULL) 451 return (NULL); 452 } else if (fp == NULL) 453 return (NULL); 454 else 455 rewind(fp); 456 457 while ((ep = pcap_next_etherent(fp)) != NULL) { 458 if (strcmp(ep->name, name) == 0) { 459 ap = (u_char *)malloc(6); 460 if (ap != NULL) { 461 memcpy(ap, ep->addr, 6); 462 return (ap); 463 } 464 break; 465 } 466 } 467 return (NULL); 468 } 469 #else 470 471 #if !defined(HAVE_DECL_ETHER_HOSTTON) || !HAVE_DECL_ETHER_HOSTTON 472 #ifndef HAVE_STRUCT_ETHER_ADDR 473 struct ether_addr { 474 unsigned char ether_addr_octet[6]; 475 }; 476 #endif 477 extern int ether_hostton(const char *, struct ether_addr *); 478 #endif 479 480 /* Use the os supplied routines */ 481 u_char * 482 pcap_ether_hostton(const char *name) 483 { 484 register u_char *ap; 485 u_char a[6]; 486 487 ap = NULL; 488 if (ether_hostton(name, (struct ether_addr *)a) == 0) { 489 ap = (u_char *)malloc(6); 490 if (ap != NULL) 491 memcpy((char *)ap, (char *)a, 6); 492 } 493 return (ap); 494 } 495 #endif 496 497 u_short 498 __pcap_nametodnaddr(const char *name) 499 { 500 #ifdef DECNETLIB 501 struct nodeent *getnodebyname(); 502 struct nodeent *nep; 503 unsigned short res; 504 505 nep = getnodebyname(name); 506 if (nep == ((struct nodeent *)0)) 507 bpf_error("unknown decnet host name '%s'\n", name); 508 509 memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short)); 510 return(res); 511 #else 512 bpf_error("decnet name support not included, '%s' cannot be translated\n", 513 name); 514 return(0); 515 #endif 516 } 517