1 /*- 2 * Copyright (c) 1985, 1988, 1993 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 the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * - 29 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 30 * 31 * Permission to use, copy, modify, and distribute this software for any 32 * purpose with or without fee is hereby granted, provided that the above 33 * copyright notice and this permission notice appear in all copies, and that 34 * the name of Digital Equipment Corporation not be used in advertising or 35 * publicity pertaining to distribution of the document or software without 36 * specific, written prior permission. 37 * 38 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 39 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 40 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 41 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 42 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 43 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 44 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 45 * SOFTWARE. 46 * - 47 * --Copyright-- 48 */ 49 50 #if defined(LIBC_SCCS) && !defined(lint) 51 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 52 #endif /* LIBC_SCCS and not lint */ 53 #include <sys/cdefs.h> 54 __FBSDID("$FreeBSD$"); 55 56 #include <sys/param.h> 57 #include <sys/socket.h> 58 #include <netinet/in.h> 59 #include <arpa/inet.h> 60 #include <netdb.h> 61 #include <stdio.h> 62 #include <ctype.h> 63 #include <string.h> 64 #include <stdarg.h> 65 #include <nsswitch.h> 66 #include <arpa/nameser.h> /* XXX */ 67 #include <resolv.h> /* XXX */ 68 #include "netdb_private.h" 69 70 void 71 _sethosthtent(int f, struct hostent_data *hed) 72 { 73 if (!hed->hostf) 74 hed->hostf = fopen(_PATH_HOSTS, "r"); 75 else 76 rewind(hed->hostf); 77 hed->stayopen = f; 78 } 79 80 void 81 _endhosthtent(struct hostent_data *hed) 82 { 83 if (hed->hostf && !hed->stayopen) { 84 (void) fclose(hed->hostf); 85 hed->hostf = NULL; 86 } 87 } 88 89 static int 90 gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped, 91 res_state statp) 92 { 93 char *p, *bp, *ep; 94 char *cp, **q; 95 int af, len; 96 char hostbuf[BUFSIZ + 1]; 97 98 if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "r"))) { 99 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 100 return (-1); 101 } 102 again: 103 if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) { 104 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 105 return (-1); 106 } 107 if (*p == '#') 108 goto again; 109 cp = strpbrk(p, "#\n"); 110 if (cp != NULL) 111 *cp = '\0'; 112 if (!(cp = strpbrk(p, " \t"))) 113 goto again; 114 *cp++ = '\0'; 115 if (inet_pton(AF_INET6, p, hed->host_addr) > 0) { 116 af = AF_INET6; 117 len = IN6ADDRSZ; 118 } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) { 119 if (mapped) { 120 _map_v4v6_address((char *)hed->host_addr, 121 (char *)hed->host_addr); 122 af = AF_INET6; 123 len = IN6ADDRSZ; 124 } else { 125 af = AF_INET; 126 len = INADDRSZ; 127 } 128 } else { 129 goto again; 130 } 131 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 132 hed->h_addr_ptrs[1] = NULL; 133 he->h_addr_list = hed->h_addr_ptrs; 134 he->h_length = len; 135 he->h_addrtype = af; 136 while (*cp == ' ' || *cp == '\t') 137 cp++; 138 bp = hed->hostbuf; 139 ep = hed->hostbuf + sizeof hed->hostbuf; 140 he->h_name = bp; 141 q = he->h_aliases = hed->host_aliases; 142 if ((p = strpbrk(cp, " \t")) != NULL) 143 *p++ = '\0'; 144 len = strlen(cp) + 1; 145 if (ep - bp < len) { 146 RES_SET_H_ERRNO(statp, NO_RECOVERY); 147 return (-1); 148 } 149 strlcpy(bp, cp, ep - bp); 150 bp += len; 151 cp = p; 152 while (cp && *cp) { 153 if (*cp == ' ' || *cp == '\t') { 154 cp++; 155 continue; 156 } 157 if (q >= &hed->host_aliases[_MAXALIASES - 1]) 158 break; 159 if ((p = strpbrk(cp, " \t")) != NULL) 160 *p++ = '\0'; 161 len = strlen(cp) + 1; 162 if (ep - bp < len) 163 break; 164 strlcpy(bp, cp, ep - bp); 165 *q++ = bp; 166 bp += len; 167 cp = p; 168 } 169 *q = NULL; 170 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 171 return (0); 172 } 173 174 int 175 gethostent_r(struct hostent *hptr, char *buffer, size_t buflen, 176 struct hostent **result, int *h_errnop) 177 { 178 struct hostent_data *hed; 179 struct hostent he; 180 res_state statp; 181 182 statp = __res_state(); 183 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { 184 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 185 *h_errnop = statp->res_h_errno; 186 return (-1); 187 } 188 if ((hed = __hostent_data_init()) == NULL) { 189 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 190 *h_errnop = statp->res_h_errno; 191 return (-1); 192 } 193 if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0) 194 return (-1); 195 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) 196 return (-1); 197 *result = hptr; 198 return (0); 199 } 200 201 struct hostent * 202 gethostent(void) 203 { 204 struct hostdata *hd; 205 struct hostent *rval; 206 int ret_h_errno; 207 208 if ((hd = __hostdata_init()) == NULL) 209 return (NULL); 210 if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval, 211 &ret_h_errno) != 0) 212 return (NULL); 213 return (rval); 214 } 215 216 int 217 _ht_gethostbyname(void *rval, void *cb_data, va_list ap) 218 { 219 const char *name; 220 int af; 221 char *buffer; 222 size_t buflen; 223 int *errnop, *h_errnop; 224 struct hostent *hptr, he; 225 struct hostent_data *hed; 226 char **cp; 227 res_state statp; 228 int error; 229 230 name = va_arg(ap, const char *); 231 af = va_arg(ap, int); 232 hptr = va_arg(ap, struct hostent *); 233 buffer = va_arg(ap, char *); 234 buflen = va_arg(ap, size_t); 235 errnop = va_arg(ap, int *); 236 h_errnop = va_arg(ap, int *); 237 238 *((struct hostent **)rval) = NULL; 239 240 statp = __res_state(); 241 if ((hed = __hostent_data_init()) == NULL) { 242 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 243 *h_errnop = statp->res_h_errno; 244 return (NS_NOTFOUND); 245 } 246 247 _sethosthtent(0, hed); 248 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) { 249 if (he.h_addrtype != af) 250 continue; 251 if (he.h_addrtype == AF_INET && 252 statp->options & RES_USE_INET6) { 253 _map_v4v6_address(he.h_addr, he.h_addr); 254 he.h_length = IN6ADDRSZ; 255 he.h_addrtype = AF_INET6; 256 } 257 if (strcasecmp(he.h_name, name) == 0) 258 break; 259 for (cp = he.h_aliases; *cp != 0; cp++) 260 if (strcasecmp(*cp, name) == 0) 261 goto found; 262 } 263 found: 264 _endhosthtent(hed); 265 266 if (error != 0) { 267 *h_errnop = statp->res_h_errno; 268 return (NS_NOTFOUND); 269 } 270 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 271 *h_errnop = statp->res_h_errno; 272 return (NS_NOTFOUND); 273 } 274 *((struct hostent **)rval) = hptr; 275 return (NS_SUCCESS); 276 } 277 278 int 279 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap) 280 { 281 const void *addr; 282 socklen_t len; 283 int af; 284 char *buffer; 285 size_t buflen; 286 int *errnop, *h_errnop; 287 struct hostent *hptr, he; 288 struct hostent_data *hed; 289 res_state statp; 290 int error; 291 292 addr = va_arg(ap, const void *); 293 len = va_arg(ap, socklen_t); 294 af = va_arg(ap, int); 295 hptr = va_arg(ap, struct hostent *); 296 buffer = va_arg(ap, char *); 297 buflen = va_arg(ap, size_t); 298 errnop = va_arg(ap, int *); 299 h_errnop = va_arg(ap, int *); 300 301 *((struct hostent **)rval) = NULL; 302 303 statp = __res_state(); 304 if ((hed = __hostent_data_init()) == NULL) { 305 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 306 *h_errnop = statp->res_h_errno; 307 return (NS_NOTFOUND); 308 } 309 310 _sethosthtent(0, hed); 311 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) 312 if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) { 313 if (he.h_addrtype == AF_INET && 314 statp->options & RES_USE_INET6) { 315 _map_v4v6_address(he.h_addr, he.h_addr); 316 he.h_length = IN6ADDRSZ; 317 he.h_addrtype = AF_INET6; 318 } 319 break; 320 } 321 _endhosthtent(hed); 322 323 if (error != 0) 324 return (NS_NOTFOUND); 325 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 326 *h_errnop = statp->res_h_errno; 327 return (NS_NOTFOUND); 328 } 329 *((struct hostent **)rval) = hptr; 330 return (NS_SUCCESS); 331 } 332