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[] = 29 "@(#) $Header: /tcpdump/master/libpcap/nametoaddr.c,v 1.60 2001/07/28 22:56:35 guy Exp $ (LBL)"; 30 #endif 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <sys/param.h> 37 #include <sys/types.h> /* concession to AIX */ 38 #include <sys/socket.h> 39 #include <sys/time.h> 40 41 struct mbuf; 42 struct rtentry; 43 #include <net/if.h> 44 #include <netinet/in.h> 45 #ifdef HAVE_NETINET_IF_ETHER_H 46 #include <netinet/if_ether.h> 47 #endif 48 #include <arpa/inet.h> 49 #ifdef INET6 50 #include <netdb.h> 51 #include <sys/socket.h> 52 #endif /*INET6*/ 53 54 #include <ctype.h> 55 #include <errno.h> 56 #include <stdlib.h> 57 #include <memory.h> 58 #include <netdb.h> 59 #include <stdio.h> 60 61 #include "pcap-int.h" 62 63 #include "gencode.h" 64 #include <pcap-namedb.h> 65 66 #ifdef HAVE_OS_PROTO_H 67 #include "os-proto.h" 68 #endif 69 70 #ifndef NTOHL 71 #define NTOHL(x) (x) = ntohl(x) 72 #define NTOHS(x) (x) = ntohs(x) 73 #endif 74 75 static inline int xdtoi(int); 76 77 /* 78 * Convert host name to internet address. 79 * Return 0 upon failure. 80 */ 81 bpf_u_int32 ** 82 pcap_nametoaddr(const char *name) 83 { 84 #ifndef h_addr 85 static bpf_u_int32 *hlist[2]; 86 #endif 87 bpf_u_int32 **p; 88 struct hostent *hp; 89 90 if ((hp = gethostbyname(name)) != NULL) { 91 #ifndef h_addr 92 hlist[0] = (bpf_u_int32 *)hp->h_addr; 93 NTOHL(hp->h_addr); 94 return hlist; 95 #else 96 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p) 97 NTOHL(**p); 98 return (bpf_u_int32 **)hp->h_addr_list; 99 #endif 100 } 101 else 102 return 0; 103 } 104 105 #ifdef INET6 106 struct addrinfo * 107 pcap_nametoaddrinfo(const char *name) 108 { 109 struct addrinfo hints, *res; 110 int error; 111 112 memset(&hints, 0, sizeof(hints)); 113 hints.ai_family = PF_UNSPEC; 114 hints.ai_socktype = SOCK_STREAM; /*not really*/ 115 error = getaddrinfo(name, NULL, &hints, &res); 116 if (error) 117 return NULL; 118 else 119 return res; 120 } 121 #endif /*INET6*/ 122 123 /* 124 * Convert net name to internet address. 125 * Return 0 upon failure. 126 */ 127 bpf_u_int32 128 pcap_nametonetaddr(const char *name) 129 { 130 struct netent *np; 131 132 if ((np = getnetbyname(name)) != NULL) 133 return np->n_net; 134 else 135 return 0; 136 } 137 138 /* 139 * Convert a port name to its port and protocol numbers. 140 * We assume only TCP or UDP. 141 * Return 0 upon failure. 142 */ 143 int 144 pcap_nametoport(const char *name, int *port, int *proto) 145 { 146 struct servent *sp; 147 char *other; 148 149 sp = getservbyname(name, (char *)0); 150 if (sp != NULL) { 151 NTOHS(sp->s_port); 152 *port = sp->s_port; 153 *proto = pcap_nametoproto(sp->s_proto); 154 /* 155 * We need to check /etc/services for ambiguous entries. 156 * If we find the ambiguous entry, and it has the 157 * same port number, change the proto to PROTO_UNDEF 158 * so both TCP and UDP will be checked. 159 */ 160 if (*proto == IPPROTO_TCP) 161 other = "udp"; 162 else 163 other = "tcp"; 164 165 sp = getservbyname(name, other); 166 if (sp != 0) { 167 NTOHS(sp->s_port); 168 #ifdef notdef 169 if (*port != sp->s_port) 170 /* Can't handle ambiguous names that refer 171 to different port numbers. */ 172 warning("ambiguous port %s in /etc/services", 173 name); 174 #endif 175 *proto = PROTO_UNDEF; 176 } 177 return 1; 178 } 179 #if defined(ultrix) || defined(__osf__) 180 /* Special hack in case NFS isn't in /etc/services */ 181 if (strcmp(name, "nfs") == 0) { 182 *port = 2049; 183 *proto = PROTO_UNDEF; 184 return 1; 185 } 186 #endif 187 return 0; 188 } 189 190 int 191 pcap_nametoproto(const char *str) 192 { 193 struct protoent *p; 194 195 p = getprotobyname(str); 196 if (p != 0) 197 return p->p_proto; 198 else 199 return PROTO_UNDEF; 200 } 201 202 #include "ethertype.h" 203 204 struct eproto { 205 char *s; 206 u_short p; 207 }; 208 209 /* Static data base of ether protocol types. */ 210 struct eproto eproto_db[] = { 211 #if 0 212 /* The FreeBSD elf linker generates a request to copy this array 213 * (including its size) when you link with -lpcap. In order to 214 * not bump the major version number of this libpcap.so, we need 215 * to ensure that the array stays the same size. Since PUP is 216 * likely never seen in real life any more, it's the first to 217 * be sacrificed (in favor of ip6). 218 */ 219 { "pup", ETHERTYPE_PUP }, 220 #endif 221 { "xns", ETHERTYPE_NS }, 222 { "ip", ETHERTYPE_IP }, 223 #ifdef INET6 224 { "ip6", ETHERTYPE_IPV6 }, 225 #endif 226 { "arp", ETHERTYPE_ARP }, 227 { "rarp", ETHERTYPE_REVARP }, 228 { "sprite", ETHERTYPE_SPRITE }, 229 { "mopdl", ETHERTYPE_MOPDL }, 230 { "moprc", ETHERTYPE_MOPRC }, 231 { "decnet", ETHERTYPE_DN }, 232 { "lat", ETHERTYPE_LAT }, 233 { "sca", ETHERTYPE_SCA }, 234 { "lanbridge", ETHERTYPE_LANBRIDGE }, 235 { "vexp", ETHERTYPE_VEXP }, 236 { "vprod", ETHERTYPE_VPROD }, 237 { "atalk", ETHERTYPE_ATALK }, 238 { "atalkarp", ETHERTYPE_AARP }, 239 { "loopback", ETHERTYPE_LOOPBACK }, 240 { "decdts", ETHERTYPE_DECDTS }, 241 { "decdns", ETHERTYPE_DECDNS }, 242 { (char *)0, 0 } 243 }; 244 245 int 246 pcap_nametoeproto(const char *s) 247 { 248 struct eproto *p = eproto_db; 249 250 while (p->s != 0) { 251 if (strcmp(p->s, s) == 0) 252 return p->p; 253 p += 1; 254 } 255 return PROTO_UNDEF; 256 } 257 258 /* Hex digit to integer. */ 259 static inline int 260 xdtoi(c) 261 register int c; 262 { 263 if (isdigit(c)) 264 return c - '0'; 265 else if (islower(c)) 266 return c - 'a' + 10; 267 else 268 return c - 'A' + 10; 269 } 270 271 int 272 __pcap_atoin(const char *s, bpf_u_int32 *addr) 273 { 274 u_int n; 275 int len; 276 277 *addr = 0; 278 len = 0; 279 while (1) { 280 n = 0; 281 while (*s && *s != '.') 282 n = n * 10 + *s++ - '0'; 283 *addr <<= 8; 284 *addr |= n & 0xff; 285 len += 8; 286 if (*s == '\0') 287 return len; 288 ++s; 289 } 290 /* NOTREACHED */ 291 } 292 293 int 294 __pcap_atodn(const char *s, bpf_u_int32 *addr) 295 { 296 #define AREASHIFT 10 297 #define AREAMASK 0176000 298 #define NODEMASK 01777 299 300 u_int node, area; 301 302 if (sscanf((char *)s, "%d.%d", &area, &node) != 2) 303 bpf_error("malformed decnet address '%s'", s); 304 305 *addr = (area << AREASHIFT) & AREAMASK; 306 *addr |= (node & NODEMASK); 307 308 return(32); 309 } 310 311 /* 312 * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new 313 * ethernet address. Assumes 's' is well formed. 314 */ 315 u_char * 316 pcap_ether_aton(const char *s) 317 { 318 register u_char *ep, *e; 319 register u_int d; 320 321 e = ep = (u_char *)malloc(6); 322 323 while (*s) { 324 if (*s == ':') 325 s += 1; 326 d = xdtoi(*s++); 327 if (isxdigit((unsigned char)*s)) { 328 d <<= 4; 329 d |= xdtoi(*s++); 330 } 331 *ep++ = d; 332 } 333 334 return (e); 335 } 336 337 #ifndef HAVE_ETHER_HOSTTON 338 /* Roll our own */ 339 u_char * 340 pcap_ether_hostton(const char *name) 341 { 342 register struct pcap_etherent *ep; 343 register u_char *ap; 344 static FILE *fp = NULL; 345 static int init = 0; 346 347 if (!init) { 348 fp = fopen(PCAP_ETHERS_FILE, "r"); 349 ++init; 350 if (fp == NULL) 351 return (NULL); 352 } else if (fp == NULL) 353 return (NULL); 354 else 355 rewind(fp); 356 357 while ((ep = pcap_next_etherent(fp)) != NULL) { 358 if (strcmp(ep->name, name) == 0) { 359 ap = (u_char *)malloc(6); 360 if (ap != NULL) { 361 memcpy(ap, ep->addr, 6); 362 return (ap); 363 } 364 break; 365 } 366 } 367 return (NULL); 368 } 369 #else 370 371 /* 372 * XXX - perhaps this should, instead, be declared in "lbl/os-XXX.h" files, 373 * for those OS versions that don't declare it, rather than being declared 374 * here? That way, for example, we could declare it on FreeBSD 2.x (which 375 * doesn't declare it), but not on FreeBSD 3.x (which declares it like 376 * this) or FreeBSD 4.x (which declares it with its first argument as 377 * "const char *", so no matter how we declare it here, it'll fail to 378 * compile on one of 3.x or 4.x). 379 */ 380 #if !defined(sgi) && !defined(__NetBSD__) && !defined(__FreeBSD__) 381 extern int ether_hostton(char *, struct ether_addr *); 382 #endif 383 384 /* Use the os supplied routines */ 385 u_char * 386 pcap_ether_hostton(const char *name) 387 { 388 register u_char *ap; 389 u_char a[6]; 390 391 ap = NULL; 392 if (ether_hostton((char *)name, (struct ether_addr *)a) == 0) { 393 ap = (u_char *)malloc(6); 394 if (ap != NULL) 395 memcpy((char *)ap, (char *)a, 6); 396 } 397 return (ap); 398 } 399 #endif 400 401 u_short 402 __pcap_nametodnaddr(const char *name) 403 { 404 #ifdef DECNETLIB 405 struct nodeent *getnodebyname(); 406 struct nodeent *nep; 407 unsigned short res; 408 409 nep = getnodebyname(name); 410 if (nep == ((struct nodeent *)0)) 411 bpf_error("unknown decnet host name '%s'\n", name); 412 413 memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short)); 414 return(res); 415 #else 416 bpf_error("decnet name support not included, '%s' cannot be translated\n", 417 name); 418 return(0); 419 #endif 420 } 421