1 /* $OpenBSD: nametoaddr.c,v 1.11 2005/03/28 06:19:58 tedu Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996 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 * Name to id translation routines used by the scanner. 24 * These functions are not time critical. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/types.h> /* concession to AIX */ 29 #include <sys/socket.h> 30 #include <sys/time.h> 31 32 struct mbuf; 33 struct rtentry; 34 35 #include <net/if.h> 36 #include <netinet/in.h> 37 #include <netinet/if_ether.h> 38 #include <arpa/inet.h> 39 #ifdef INET6 40 #include <netdb.h> 41 #include <sys/socket.h> 42 #endif /*INET6*/ 43 44 #include <ctype.h> 45 #include <errno.h> 46 #include <stdlib.h> 47 #include <memory.h> 48 #include <netdb.h> 49 #include <stdio.h> 50 51 #include "pcap-int.h" 52 53 #include "gencode.h" 54 #include <pcap-namedb.h> 55 56 #ifdef HAVE_OS_PROTO_H 57 #include "os-proto.h" 58 #endif 59 60 #ifndef NTOHL 61 #define NTOHL(x) (x) = ntohl(x) 62 #define NTOHS(x) (x) = ntohs(x) 63 #endif 64 65 static __inline int xdtoi(int); 66 67 /* 68 * Convert host name to internet address. 69 * Return 0 upon failure. 70 */ 71 bpf_u_int32 ** 72 pcap_nametoaddr(const char *name) 73 { 74 #ifndef h_addr 75 static bpf_u_int32 *hlist[2]; 76 #endif 77 bpf_u_int32 **p; 78 struct hostent *hp; 79 80 if ((hp = gethostbyname(name)) != NULL) { 81 #ifndef h_addr 82 hlist[0] = (bpf_u_int32 *)hp->h_addr; 83 NTOHL(hp->h_addr); 84 return hlist; 85 #else 86 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p) 87 NTOHL(**p); 88 return (bpf_u_int32 **)hp->h_addr_list; 89 #endif 90 } 91 else 92 return 0; 93 } 94 95 #ifdef INET6 96 struct addrinfo * 97 pcap_nametoaddrinfo(const char *name) 98 { 99 struct addrinfo hints, *res; 100 int error; 101 102 memset(&hints, 0, sizeof(hints)); 103 hints.ai_family = PF_UNSPEC; 104 hints.ai_socktype = SOCK_STREAM; /*not really*/ 105 error = getaddrinfo(name, NULL, &hints, &res); 106 if (error) 107 return NULL; 108 else 109 return res; 110 } 111 #endif /*INET6*/ 112 113 /* 114 * Convert net name to internet address. 115 * Return 0 upon failure. 116 */ 117 bpf_u_int32 118 pcap_nametonetaddr(const char *name) 119 { 120 struct netent *np; 121 122 if ((np = getnetbyname(name)) != NULL) 123 return np->n_net; 124 else 125 return 0; 126 } 127 128 /* 129 * Convert a port name to its port and protocol numbers. 130 * We assume only TCP or UDP. 131 * Return 0 upon failure. 132 */ 133 int 134 pcap_nametoport(const char *name, int *port, int *proto) 135 { 136 struct servent *sp; 137 char *other; 138 139 sp = getservbyname(name, (char *)0); 140 if (sp != NULL) { 141 NTOHS(sp->s_port); 142 *port = sp->s_port; 143 *proto = pcap_nametoproto(sp->s_proto); 144 /* 145 * We need to check /etc/services for ambiguous entries. 146 * If we find the ambiguous entry, and it has the 147 * same port number, change the proto to PROTO_UNDEF 148 * so both TCP and UDP will be checked. 149 */ 150 if (*proto == IPPROTO_TCP) 151 other = "udp"; 152 else 153 other = "tcp"; 154 155 sp = getservbyname(name, other); 156 if (sp != 0) { 157 NTOHS(sp->s_port); 158 #ifdef notdef 159 if (*port != sp->s_port) 160 /* Can't handle ambiguous names that refer 161 to different port numbers. */ 162 warning("ambiguous port %s in /etc/services", 163 name); 164 #endif 165 *proto = PROTO_UNDEF; 166 } 167 return 1; 168 } 169 #if defined(ultrix) || defined(__osf__) 170 /* Special hack in case NFS isn't in /etc/services */ 171 if (strcmp(name, "nfs") == 0) { 172 *port = 2049; 173 *proto = PROTO_UNDEF; 174 return 1; 175 } 176 #endif 177 return 0; 178 } 179 180 int 181 pcap_nametoproto(const char *str) 182 { 183 struct protoent *p; 184 185 p = getprotobyname(str); 186 if (p != 0) 187 return p->p_proto; 188 else 189 return PROTO_UNDEF; 190 } 191 192 #include "ethertype.h" 193 194 struct eproto { 195 char *s; 196 u_short p; 197 }; 198 199 /* Static data base of ether protocol types. */ 200 struct eproto eproto_db[] = { 201 { "pup", ETHERTYPE_PUP }, 202 { "xns", ETHERTYPE_NS }, 203 { "ip", ETHERTYPE_IP }, 204 #ifdef INET6 205 { "ip6", ETHERTYPE_IPV6 }, 206 #endif 207 { "arp", ETHERTYPE_ARP }, 208 { "rarp", ETHERTYPE_REVARP }, 209 { "sprite", ETHERTYPE_SPRITE }, 210 { "mopdl", ETHERTYPE_MOPDL }, 211 { "moprc", ETHERTYPE_MOPRC }, 212 { "decnet", ETHERTYPE_DN }, 213 { "lat", ETHERTYPE_LAT }, 214 { "sca", ETHERTYPE_SCA }, 215 { "lanbridge", ETHERTYPE_LANBRIDGE }, 216 { "vexp", ETHERTYPE_VEXP }, 217 { "vprod", ETHERTYPE_VPROD }, 218 { "atalk", ETHERTYPE_ATALK }, 219 { "atalkarp", ETHERTYPE_AARP }, 220 { "loopback", ETHERTYPE_LOOPBACK }, 221 { "decdts", ETHERTYPE_DECDTS }, 222 { "decdns", ETHERTYPE_DECDNS }, 223 { (char *)0, 0 } 224 }; 225 226 int 227 pcap_nametoeproto(const char *s) 228 { 229 struct eproto *p = eproto_db; 230 231 while (p->s != 0) { 232 if (strcmp(p->s, s) == 0) 233 return p->p; 234 p += 1; 235 } 236 return PROTO_UNDEF; 237 } 238 239 /* Hex digit to integer. */ 240 static __inline int 241 xdtoi(c) 242 register int c; 243 { 244 if (isdigit(c)) 245 return c - '0'; 246 else if (islower(c)) 247 return c - 'a' + 10; 248 else 249 return c - 'A' + 10; 250 } 251 252 int 253 __pcap_atoin(const char *s, bpf_u_int32 *addr) 254 { 255 u_int n; 256 int len; 257 258 *addr = 0; 259 len = 0; 260 while (1) { 261 n = 0; 262 while (*s && *s != '.') 263 n = n * 10 + *s++ - '0'; 264 *addr <<= 8; 265 *addr |= n & 0xff; 266 len += 8; 267 if (*s == '\0') 268 return len; 269 ++s; 270 } 271 /* NOTREACHED */ 272 } 273 274 int 275 __pcap_atodn(const char *s, bpf_u_int32 *addr) 276 { 277 #define AREASHIFT 10 278 #define AREAMASK 0176000 279 #define NODEMASK 01777 280 281 u_int node, area; 282 283 if (sscanf((char *)s, "%d.%d", &area, &node) != 2) 284 bpf_error("malformed decnet address '%s'", s); 285 286 *addr = (area << AREASHIFT) & AREAMASK; 287 *addr |= (node & NODEMASK); 288 289 return(32); 290 } 291 292 /* 293 * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new 294 * ethernet address. Assumes 's' is well formed. 295 */ 296 u_char * 297 pcap_ether_aton(const char *s) 298 { 299 register u_char *ep, *e; 300 register u_int d; 301 302 e = ep = (u_char *)malloc(6); 303 304 while (*s) { 305 if (*s == ':') 306 s += 1; 307 d = xdtoi(*s++); 308 if (isxdigit(*s)) { 309 d <<= 4; 310 d |= xdtoi(*s++); 311 } 312 *ep++ = d; 313 } 314 315 return (e); 316 } 317 318 #ifndef HAVE_ETHER_HOSTTON 319 /* Roll our own */ 320 u_char * 321 pcap_ether_hostton(const char *name) 322 { 323 register struct pcap_etherent *ep; 324 register u_char *ap; 325 static FILE *fp = NULL; 326 static init = 0; 327 328 if (!init) { 329 fp = fopen(PCAP_ETHERS_FILE, "r"); 330 ++init; 331 if (fp == NULL) 332 return (NULL); 333 } else if (fp == NULL) 334 return (NULL); 335 else 336 rewind(fp); 337 338 while ((ep = pcap_next_etherent(fp)) != NULL) { 339 if (strcmp(ep->name, name) == 0) { 340 ap = (u_char *)malloc(6); 341 if (ap != NULL) { 342 memcpy(ap, ep->addr, 6); 343 return (ap); 344 } 345 break; 346 } 347 } 348 return (NULL); 349 } 350 #else 351 352 /* Use the os supplied routines */ 353 u_char * 354 pcap_ether_hostton(const char *name) 355 { 356 register u_char *ap; 357 u_char a[6]; 358 359 ap = NULL; 360 if (ether_hostton(name, (struct ether_addr *)a) == 0) { 361 ap = (u_char *)malloc(6); 362 if (ap != NULL) 363 memcpy((char *)ap, (char *)a, 6); 364 } 365 return (ap); 366 } 367 #endif 368 369 u_short 370 __pcap_nametodnaddr(const char *name) 371 { 372 #ifdef DECNETLIB 373 struct nodeent *getnodebyname(); 374 struct nodeent *nep; 375 unsigned short res; 376 377 nep = getnodebyname(name); 378 if (nep == ((struct nodeent *)0)) 379 bpf_error("unknown decnet host name '%s'\n", name); 380 381 memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short)); 382 return(res); 383 #else 384 bpf_error("decnet name support not included, '%s' cannot be translated\n", 385 name); 386 /* NOTREACHED */ 387 #ifdef lint 388 /* 389 * Arguably, lint should assume that functions which don't return 390 * (i.e. that contain no return statements and whose ends are 391 * unreachable) actually return a value, so callers won't get 392 * warnings for using that value (since they won't actually 393 * be doing so). However, most lints don't seem to do that... 394 */ 395 return (0); 396 #endif 397 #endif 398 } 399