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 1.51 1999/11/25 08:25:35 itojun Exp $ (LBL)"; 30 #endif 31 32 #include <sys/param.h> 33 #include <sys/types.h> /* concession to AIX */ 34 #include <sys/socket.h> 35 #include <sys/time.h> 36 37 #if __STDC__ 38 struct mbuf; 39 struct rtentry; 40 #endif 41 42 #include <net/if.h> 43 #include <net/ethernet.h> 44 #include <netinet/in.h> 45 #include <arpa/inet.h> 46 #ifdef INET6 47 #include <netdb.h> 48 #include <sys/socket.h> 49 #endif /*INET6*/ 50 51 #include <ctype.h> 52 #include <errno.h> 53 #include <stdlib.h> 54 #include <memory.h> 55 #include <netdb.h> 56 #include <stdio.h> 57 58 #include "pcap-int.h" 59 60 #include "gencode.h" 61 #include <pcap-namedb.h> 62 63 #include "gnuc.h" 64 #ifdef HAVE_OS_PROTO_H 65 #include "os-proto.h" 66 #endif 67 68 #ifndef NTOHL 69 #define NTOHL(x) (x) = ntohl(x) 70 #define NTOHS(x) (x) = ntohs(x) 71 #endif 72 73 static inline int xdtoi(int); 74 75 /* 76 * Convert host name to internet address. 77 * Return 0 upon failure. 78 */ 79 #ifndef INET6 80 bpf_u_int32 ** 81 pcap_nametoaddr(const char *name) 82 { 83 #ifndef h_addr 84 static bpf_u_int32 *hlist[2]; 85 #endif 86 bpf_u_int32 **p; 87 struct hostent *hp; 88 89 if ((hp = gethostbyname(name)) != NULL) { 90 #ifndef h_addr 91 hlist[0] = (bpf_u_int32 *)hp->h_addr; 92 NTOHL(hp->h_addr); 93 return hlist; 94 #else 95 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p) 96 NTOHL(**p); 97 return (bpf_u_int32 **)hp->h_addr_list; 98 #endif 99 } 100 else 101 return 0; 102 } 103 #else 104 struct addrinfo * 105 pcap_nametoaddr(const char *name) 106 { 107 struct addrinfo hints, *res; 108 int error; 109 110 memset(&hints, 0, sizeof(hints)); 111 hints.ai_family = PF_UNSPEC; 112 hints.ai_socktype = SOCK_STREAM; /*not really*/ 113 error = getaddrinfo(name, NULL, &hints, &res); 114 if (error) 115 return NULL; 116 else 117 return res; 118 } 119 #endif /*INET6*/ 120 121 /* 122 * Convert net name to internet address. 123 * Return 0 upon failure. 124 */ 125 bpf_u_int32 126 pcap_nametonetaddr(const char *name) 127 { 128 struct netent *np; 129 130 if ((np = getnetbyname(name)) != NULL) 131 return np->n_net; 132 else 133 return 0; 134 } 135 136 /* 137 * Convert a port name to its port and protocol numbers. 138 * We assume only TCP or UDP. 139 * Return 0 upon failure. 140 */ 141 int 142 pcap_nametoport(const char *name, int *port, int *proto) 143 { 144 struct servent *sp; 145 char *other; 146 147 sp = getservbyname(name, (char *)0); 148 if (sp != NULL) { 149 NTOHS(sp->s_port); 150 *port = sp->s_port; 151 *proto = pcap_nametoproto(sp->s_proto); 152 /* 153 * We need to check /etc/services for ambiguous entries. 154 * If we find the ambiguous entry, and it has the 155 * same port number, change the proto to PROTO_UNDEF 156 * so both TCP and UDP will be checked. 157 */ 158 if (*proto == IPPROTO_TCP) 159 other = "udp"; 160 else 161 other = "tcp"; 162 163 sp = getservbyname(name, other); 164 if (sp != 0) { 165 NTOHS(sp->s_port); 166 #ifdef notdef 167 if (*port != sp->s_port) 168 /* Can't handle ambiguous names that refer 169 to different port numbers. */ 170 warning("ambiguous port %s in /etc/services", 171 name); 172 #endif 173 *proto = PROTO_UNDEF; 174 } 175 return 1; 176 } 177 #if defined(ultrix) || defined(__osf__) 178 /* Special hack in case NFS isn't in /etc/services */ 179 if (strcmp(name, "nfs") == 0) { 180 *port = 2049; 181 *proto = PROTO_UNDEF; 182 return 1; 183 } 184 #endif 185 return 0; 186 } 187 188 int 189 pcap_nametoproto(const char *str) 190 { 191 struct protoent *p; 192 193 p = getprotobyname(str); 194 if (p != 0) 195 return p->p_proto; 196 else 197 return PROTO_UNDEF; 198 } 199 200 #include "ethertype.h" 201 202 struct eproto { 203 char *s; 204 u_short p; 205 }; 206 207 /* Static data base of ether protocol types. */ 208 struct eproto eproto_db[] = { 209 #if 0 210 /* The FreeBSD elf linker generates a request to copy this array 211 * (including its size) when you link with -lpcap. In order to 212 * not bump the major version number of this libpcap.so, we need 213 * to ensure that the array stays the same size. Since PUP is 214 * likely never seen in real life any more, it's the first to 215 * be sacrificed (in favor of ip6). 216 */ 217 { "pup", ETHERTYPE_PUP }, 218 #endif 219 { "xns", ETHERTYPE_NS }, 220 { "ip", ETHERTYPE_IP }, 221 #ifdef INET6 222 { "ip6", ETHERTYPE_IPV6 }, 223 #endif 224 { "arp", ETHERTYPE_ARP }, 225 { "rarp", ETHERTYPE_REVARP }, 226 { "sprite", ETHERTYPE_SPRITE }, 227 { "mopdl", ETHERTYPE_MOPDL }, 228 { "moprc", ETHERTYPE_MOPRC }, 229 { "decnet", ETHERTYPE_DN }, 230 { "lat", ETHERTYPE_LAT }, 231 { "sca", ETHERTYPE_SCA }, 232 { "lanbridge", ETHERTYPE_LANBRIDGE }, 233 { "vexp", ETHERTYPE_VEXP }, 234 { "vprod", ETHERTYPE_VPROD }, 235 { "atalk", ETHERTYPE_ATALK }, 236 { "atalkarp", ETHERTYPE_AARP }, 237 { "loopback", ETHERTYPE_LOOPBACK }, 238 { "decdts", ETHERTYPE_DECDTS }, 239 { "decdns", ETHERTYPE_DECDNS }, 240 { (char *)0, 0 } 241 }; 242 243 int 244 pcap_nametoeproto(const char *s) 245 { 246 struct eproto *p = eproto_db; 247 248 while (p->s != 0) { 249 if (strcmp(p->s, s) == 0) 250 return p->p; 251 p += 1; 252 } 253 return PROTO_UNDEF; 254 } 255 256 /* Hex digit to integer. */ 257 static inline int 258 xdtoi(c) 259 register int c; 260 { 261 if (isdigit(c)) 262 return c - '0'; 263 else if (islower(c)) 264 return c - 'a' + 10; 265 else 266 return c - 'A' + 10; 267 } 268 269 int 270 __pcap_atoin(const char *s, bpf_u_int32 *addr) 271 { 272 u_int n; 273 int len; 274 275 *addr = 0; 276 len = 0; 277 while (1) { 278 n = 0; 279 while (*s && *s != '.') 280 n = n * 10 + *s++ - '0'; 281 *addr <<= 8; 282 *addr |= n & 0xff; 283 len += 8; 284 if (*s == '\0') 285 return len; 286 ++s; 287 } 288 /* NOTREACHED */ 289 } 290 291 int 292 __pcap_atodn(const char *s, bpf_u_int32 *addr) 293 { 294 #define AREASHIFT 10 295 #define AREAMASK 0176000 296 #define NODEMASK 01777 297 298 u_int node, area; 299 300 if (sscanf((char *)s, "%d.%d", &area, &node) != 2) 301 bpf_error("malformed decnet address '%s'", s); 302 303 *addr = (area << AREASHIFT) & AREAMASK; 304 *addr |= (node & NODEMASK); 305 306 return(32); 307 } 308 309 /* 310 * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new 311 * ethernet address. Assumes 's' is well formed. 312 */ 313 u_char * 314 pcap_ether_aton(const char *s) 315 { 316 register u_char *ep, *e; 317 register u_int d; 318 319 e = ep = (u_char *)malloc(6); 320 321 while (*s) { 322 if (*s == ':') 323 s += 1; 324 d = xdtoi(*s++); 325 if (isxdigit(*s)) { 326 d <<= 4; 327 d |= xdtoi(*s++); 328 } 329 *ep++ = d; 330 } 331 332 return (e); 333 } 334 335 #ifndef HAVE_ETHER_HOSTTON 336 /* Roll our own */ 337 u_char * 338 pcap_ether_hostton(const char *name) 339 { 340 register struct pcap_etherent *ep; 341 register u_char *ap; 342 static FILE *fp = NULL; 343 static init = 0; 344 345 if (!init) { 346 fp = fopen(PCAP_ETHERS_FILE, "r"); 347 ++init; 348 if (fp == NULL) 349 return (NULL); 350 } else if (fp == NULL) 351 return (NULL); 352 else 353 rewind(fp); 354 355 while ((ep = pcap_next_etherent(fp)) != NULL) { 356 if (strcmp(ep->name, name) == 0) { 357 ap = (u_char *)malloc(6); 358 if (ap != NULL) { 359 memcpy(ap, ep->addr, 6); 360 return (ap); 361 } 362 break; 363 } 364 } 365 return (NULL); 366 } 367 #else 368 369 #if !defined(sgi) && !defined(__NetBSD__) 370 extern int ether_hostton(char *, struct ether_addr *); 371 #endif 372 373 /* Use the os supplied routines */ 374 u_char * 375 pcap_ether_hostton(const char *name) 376 { 377 register u_char *ap; 378 u_char a[6]; 379 380 ap = NULL; 381 if (ether_hostton((char *)name, (struct ether_addr *)a) == 0) { 382 ap = (u_char *)malloc(6); 383 if (ap != NULL) 384 memcpy((char *)ap, (char *)a, 6); 385 } 386 return (ap); 387 } 388 #endif 389 390 u_short 391 __pcap_nametodnaddr(const char *name) 392 { 393 #ifdef DECNETLIB 394 struct nodeent *getnodebyname(); 395 struct nodeent *nep; 396 unsigned short res; 397 398 nep = getnodebyname(name); 399 if (nep == ((struct nodeent *)0)) 400 bpf_error("unknown decnet host name '%s'\n", name); 401 402 memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short)); 403 return(res); 404 #else 405 bpf_error("decnet name support not included, '%s' cannot be translated\n", 406 name); 407 #endif 408 } 409