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 25 #ifndef lint 26 static const char rcsid[] _U_ = 27 "@(#) $Header: /tcpdump/master/libpcap/nametoaddr.c,v 1.82.2.1 2008/02/06 10:21:47 guy Exp $ (LBL)"; 28 #endif 29 30 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #ifdef WIN32 35 #include <pcap-stdinc.h> 36 37 #else /* WIN32 */ 38 39 #include <sys/param.h> 40 #include <sys/types.h> /* concession to AIX */ 41 #include <sys/socket.h> 42 #include <sys/time.h> 43 44 #include <netinet/in.h> 45 #endif /* WIN32 */ 46 47 /* 48 * XXX - why was this included even on UNIX? 49 */ 50 #ifdef __MINGW32__ 51 #include "IP6_misc.h" 52 #endif 53 54 #ifndef WIN32 55 #ifdef HAVE_ETHER_HOSTTON 56 /* 57 * XXX - do we need any of this if <netinet/if_ether.h> doesn't declare 58 * ether_hostton()? 59 */ 60 #ifdef HAVE_NETINET_IF_ETHER_H 61 struct mbuf; /* Squelch compiler warnings on some platforms for */ 62 struct rtentry; /* declarations in <net/if.h> */ 63 #include <net/if.h> /* for "struct ifnet" in "struct arpcom" on Solaris */ 64 #include <netinet/if_ether.h> 65 #endif /* HAVE_NETINET_IF_ETHER_H */ 66 #ifdef NETINET_ETHER_H_DECLARES_ETHER_HOSTTON 67 #include <netinet/ether.h> 68 #endif /* NETINET_ETHER_H_DECLARES_ETHER_HOSTTON */ 69 #endif /* HAVE_ETHER_HOSTTON */ 70 #include <arpa/inet.h> 71 #include <netdb.h> 72 #endif /* WIN32 */ 73 74 #include <ctype.h> 75 #include <errno.h> 76 #include <stdlib.h> 77 #include <string.h> 78 #include <stdio.h> 79 80 #include "pcap-int.h" 81 82 #include "gencode.h" 83 #include <pcap/namedb.h> 84 85 #ifdef HAVE_OS_PROTO_H 86 #include "os-proto.h" 87 #endif 88 89 #ifndef NTOHL 90 #define NTOHL(x) (x) = ntohl(x) 91 #define NTOHS(x) (x) = ntohs(x) 92 #endif 93 94 static inline int xdtoi(int); 95 96 /* 97 * Convert host name to internet address. 98 * Return 0 upon failure. 99 */ 100 bpf_u_int32 ** 101 pcap_nametoaddr(const char *name) 102 { 103 #ifndef h_addr 104 static bpf_u_int32 *hlist[2]; 105 #endif 106 bpf_u_int32 **p; 107 struct hostent *hp; 108 109 if ((hp = gethostbyname(name)) != NULL) { 110 #ifndef h_addr 111 hlist[0] = (bpf_u_int32 *)hp->h_addr; 112 NTOHL(hp->h_addr); 113 return hlist; 114 #else 115 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p) 116 NTOHL(**p); 117 return (bpf_u_int32 **)hp->h_addr_list; 118 #endif 119 } 120 else 121 return 0; 122 } 123 124 #ifdef INET6 125 struct addrinfo * 126 pcap_nametoaddrinfo(const char *name) 127 { 128 struct addrinfo hints, *res; 129 int error; 130 131 memset(&hints, 0, sizeof(hints)); 132 hints.ai_family = PF_UNSPEC; 133 hints.ai_socktype = SOCK_STREAM; /*not really*/ 134 hints.ai_protocol = IPPROTO_TCP; /*not really*/ 135 error = getaddrinfo(name, NULL, &hints, &res); 136 if (error) 137 return NULL; 138 else 139 return res; 140 } 141 #endif /*INET6*/ 142 143 /* 144 * Convert net name to internet address. 145 * Return 0 upon failure. 146 */ 147 bpf_u_int32 148 pcap_nametonetaddr(const char *name) 149 { 150 #ifndef WIN32 151 struct netent *np; 152 153 if ((np = getnetbyname(name)) != NULL) 154 return np->n_net; 155 else 156 return 0; 157 #else 158 /* 159 * There's no "getnetbyname()" on Windows. 160 */ 161 return 0; 162 #endif 163 } 164 165 /* 166 * Convert a port name to its port and protocol numbers. 167 * We assume only TCP or UDP. 168 * Return 0 upon failure. 169 */ 170 int 171 pcap_nametoport(const char *name, int *port, int *proto) 172 { 173 struct servent *sp; 174 int tcp_port = -1; 175 int udp_port = -1; 176 177 /* 178 * We need to check /etc/services for ambiguous entries. 179 * If we find the ambiguous entry, and it has the 180 * same port number, change the proto to PROTO_UNDEF 181 * so both TCP and UDP will be checked. 182 */ 183 sp = getservbyname(name, "tcp"); 184 if (sp != NULL) tcp_port = ntohs(sp->s_port); 185 sp = getservbyname(name, "udp"); 186 if (sp != NULL) udp_port = ntohs(sp->s_port); 187 if (tcp_port >= 0) { 188 *port = tcp_port; 189 *proto = IPPROTO_TCP; 190 if (udp_port >= 0) { 191 if (udp_port == tcp_port) 192 *proto = PROTO_UNDEF; 193 #ifdef notdef 194 else 195 /* Can't handle ambiguous names that refer 196 to different port numbers. */ 197 warning("ambiguous port %s in /etc/services", 198 name); 199 #endif 200 } 201 return 1; 202 } 203 if (udp_port >= 0) { 204 *port = udp_port; 205 *proto = IPPROTO_UDP; 206 return 1; 207 } 208 #if defined(ultrix) || defined(__osf__) 209 /* Special hack in case NFS isn't in /etc/services */ 210 if (strcmp(name, "nfs") == 0) { 211 *port = 2049; 212 *proto = PROTO_UNDEF; 213 return 1; 214 } 215 #endif 216 return 0; 217 } 218 219 /* 220 * Convert a string in the form PPP-PPP, where correspond to ports, to 221 * a starting and ending port in a port range. 222 * Return 0 on failure. 223 */ 224 int 225 pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto) 226 { 227 u_int p1, p2; 228 char *off, *cpy; 229 int save_proto; 230 231 if (sscanf(name, "%d-%d", &p1, &p2) != 2) { 232 if ((cpy = strdup(name)) == NULL) 233 return 0; 234 235 if ((off = strchr(cpy, '-')) == NULL) { 236 free(cpy); 237 return 0; 238 } 239 240 *off = '\0'; 241 242 if (pcap_nametoport(cpy, port1, proto) == 0) { 243 free(cpy); 244 return 0; 245 } 246 save_proto = *proto; 247 248 if (pcap_nametoport(off + 1, port2, proto) == 0) { 249 free(cpy); 250 return 0; 251 } 252 253 if (*proto != save_proto) 254 *proto = PROTO_UNDEF; 255 } else { 256 *port1 = p1; 257 *port2 = p2; 258 *proto = PROTO_UNDEF; 259 } 260 261 return 1; 262 } 263 264 int 265 pcap_nametoproto(const char *str) 266 { 267 struct protoent *p; 268 269 p = getprotobyname(str); 270 if (p != 0) 271 return p->p_proto; 272 else 273 return PROTO_UNDEF; 274 } 275 276 #include "ethertype.h" 277 278 struct eproto { 279 const char *s; 280 u_short p; 281 }; 282 283 /* Static data base of ether protocol types. */ 284 struct eproto eproto_db[] = { 285 { "pup", ETHERTYPE_PUP }, 286 { "xns", ETHERTYPE_NS }, 287 { "ip", ETHERTYPE_IP }, 288 #ifdef INET6 289 { "ip6", ETHERTYPE_IPV6 }, 290 #endif 291 { "arp", ETHERTYPE_ARP }, 292 { "rarp", ETHERTYPE_REVARP }, 293 { "sprite", ETHERTYPE_SPRITE }, 294 { "mopdl", ETHERTYPE_MOPDL }, 295 { "moprc", ETHERTYPE_MOPRC }, 296 { "decnet", ETHERTYPE_DN }, 297 { "lat", ETHERTYPE_LAT }, 298 { "sca", ETHERTYPE_SCA }, 299 { "lanbridge", ETHERTYPE_LANBRIDGE }, 300 { "vexp", ETHERTYPE_VEXP }, 301 { "vprod", ETHERTYPE_VPROD }, 302 { "atalk", ETHERTYPE_ATALK }, 303 { "atalkarp", ETHERTYPE_AARP }, 304 { "loopback", ETHERTYPE_LOOPBACK }, 305 { "decdts", ETHERTYPE_DECDTS }, 306 { "decdns", ETHERTYPE_DECDNS }, 307 { (char *)0, 0 } 308 }; 309 310 int 311 pcap_nametoeproto(const char *s) 312 { 313 struct eproto *p = eproto_db; 314 315 while (p->s != 0) { 316 if (strcmp(p->s, s) == 0) 317 return p->p; 318 p += 1; 319 } 320 return PROTO_UNDEF; 321 } 322 323 #include "llc.h" 324 325 /* Static data base of LLC values. */ 326 static struct eproto llc_db[] = { 327 { "iso", LLCSAP_ISONS }, 328 { "stp", LLCSAP_8021D }, 329 { "ipx", LLCSAP_IPX }, 330 { "netbeui", LLCSAP_NETBEUI }, 331 { (char *)0, 0 } 332 }; 333 334 int 335 pcap_nametollc(const char *s) 336 { 337 struct eproto *p = llc_db; 338 339 while (p->s != 0) { 340 if (strcmp(p->s, s) == 0) 341 return p->p; 342 p += 1; 343 } 344 return PROTO_UNDEF; 345 } 346 347 /* Hex digit to integer. */ 348 static inline int 349 xdtoi(c) 350 register int c; 351 { 352 if (isdigit(c)) 353 return c - '0'; 354 else if (islower(c)) 355 return c - 'a' + 10; 356 else 357 return c - 'A' + 10; 358 } 359 360 int 361 __pcap_atoin(const char *s, bpf_u_int32 *addr) 362 { 363 u_int n; 364 int len; 365 366 *addr = 0; 367 len = 0; 368 while (1) { 369 n = 0; 370 while (*s && *s != '.') 371 n = n * 10 + *s++ - '0'; 372 *addr <<= 8; 373 *addr |= n & 0xff; 374 len += 8; 375 if (*s == '\0') 376 return len; 377 ++s; 378 } 379 /* NOTREACHED */ 380 } 381 382 int 383 __pcap_atodn(const char *s, bpf_u_int32 *addr) 384 { 385 #define AREASHIFT 10 386 #define AREAMASK 0176000 387 #define NODEMASK 01777 388 389 u_int node, area; 390 391 if (sscanf(s, "%d.%d", &area, &node) != 2) 392 bpf_error("malformed decnet address '%s'", s); 393 394 *addr = (area << AREASHIFT) & AREAMASK; 395 *addr |= (node & NODEMASK); 396 397 return(32); 398 } 399 400 /* 401 * Convert 's', which can have the one of the forms: 402 * 403 * "xx:xx:xx:xx:xx:xx" 404 * "xx.xx.xx.xx.xx.xx" 405 * "xx-xx-xx-xx-xx-xx" 406 * "xxxx.xxxx.xxxx" 407 * "xxxxxxxxxxxx" 408 * 409 * (or various mixes of ':', '.', and '-') into a new 410 * ethernet address. Assumes 's' is well formed. 411 */ 412 u_char * 413 pcap_ether_aton(const char *s) 414 { 415 register u_char *ep, *e; 416 register u_int d; 417 418 e = ep = (u_char *)malloc(6); 419 420 while (*s) { 421 if (*s == ':' || *s == '.' || *s == '-') 422 s += 1; 423 d = xdtoi(*s++); 424 if (isxdigit((unsigned char)*s)) { 425 d <<= 4; 426 d |= xdtoi(*s++); 427 } 428 *ep++ = d; 429 } 430 431 return (e); 432 } 433 434 #ifndef HAVE_ETHER_HOSTTON 435 /* Roll our own */ 436 u_char * 437 pcap_ether_hostton(const char *name) 438 { 439 register struct pcap_etherent *ep; 440 register u_char *ap; 441 static FILE *fp = NULL; 442 static int init = 0; 443 444 if (!init) { 445 fp = fopen(PCAP_ETHERS_FILE, "r"); 446 ++init; 447 if (fp == NULL) 448 return (NULL); 449 } else if (fp == NULL) 450 return (NULL); 451 else 452 rewind(fp); 453 454 while ((ep = pcap_next_etherent(fp)) != NULL) { 455 if (strcmp(ep->name, name) == 0) { 456 ap = (u_char *)malloc(6); 457 if (ap != NULL) { 458 memcpy(ap, ep->addr, 6); 459 return (ap); 460 } 461 break; 462 } 463 } 464 return (NULL); 465 } 466 #else 467 468 #if !defined(HAVE_DECL_ETHER_HOSTTON) || !HAVE_DECL_ETHER_HOSTTON 469 #ifndef HAVE_STRUCT_ETHER_ADDR 470 struct ether_addr { 471 unsigned char ether_addr_octet[6]; 472 }; 473 #endif 474 extern int ether_hostton(const char *, struct ether_addr *); 475 #endif 476 477 /* Use the os supplied routines */ 478 u_char * 479 pcap_ether_hostton(const char *name) 480 { 481 register u_char *ap; 482 u_char a[6]; 483 484 ap = NULL; 485 if (ether_hostton(name, (struct ether_addr *)a) == 0) { 486 ap = (u_char *)malloc(6); 487 if (ap != NULL) 488 memcpy((char *)ap, (char *)a, 6); 489 } 490 return (ap); 491 } 492 #endif 493 494 u_short 495 __pcap_nametodnaddr(const char *name) 496 { 497 #ifdef DECNETLIB 498 struct nodeent *getnodebyname(); 499 struct nodeent *nep; 500 unsigned short res; 501 502 nep = getnodebyname(name); 503 if (nep == ((struct nodeent *)0)) 504 bpf_error("unknown decnet host name '%s'\n", name); 505 506 memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short)); 507 return(res); 508 #else 509 bpf_error("decnet name support not included, '%s' cannot be translated\n", 510 name); 511 return(0); 512 #endif 513 } 514