1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1985, 1988, 1993 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 the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * - 31 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 * - 49 * --Copyright-- 50 */ 51 52 #if defined(LIBC_SCCS) && !defined(lint) 53 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 54 #endif /* LIBC_SCCS and not lint */ 55 #include <sys/cdefs.h> 56 __FBSDID("$FreeBSD$"); 57 58 #include <sys/param.h> 59 #include <sys/socket.h> 60 #include <netinet/in.h> 61 #include <arpa/inet.h> 62 #include <netdb.h> 63 #include <stdio.h> 64 #include <ctype.h> 65 #include <errno.h> 66 #include <string.h> 67 #include <stdarg.h> 68 #include <nsswitch.h> 69 #include <arpa/nameser.h> /* XXX */ 70 #include <resolv.h> /* XXX */ 71 #include "netdb_private.h" 72 73 void 74 _sethosthtent(int f, struct hostent_data *hed) 75 { 76 if (!hed->hostf) 77 hed->hostf = fopen(_PATH_HOSTS, "re"); 78 else 79 rewind(hed->hostf); 80 hed->stayopen = f; 81 } 82 83 void 84 _endhosthtent(struct hostent_data *hed) 85 { 86 if (hed->hostf && !hed->stayopen) { 87 (void) fclose(hed->hostf); 88 hed->hostf = NULL; 89 } 90 } 91 92 static int 93 gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped, 94 res_state statp) 95 { 96 char *p, *bp, *ep; 97 char *cp, **q; 98 int af, len; 99 char hostbuf[BUFSIZ + 1]; 100 101 if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "re"))) { 102 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 103 return (-1); 104 } 105 again: 106 if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) { 107 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 108 return (-1); 109 } 110 if (*p == '#') 111 goto again; 112 cp = strpbrk(p, "#\n"); 113 if (cp != NULL) 114 *cp = '\0'; 115 if (!(cp = strpbrk(p, " \t"))) 116 goto again; 117 *cp++ = '\0'; 118 if (inet_pton(AF_INET6, p, hed->host_addr) > 0) { 119 af = AF_INET6; 120 len = IN6ADDRSZ; 121 } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) { 122 if (mapped) { 123 _map_v4v6_address((char *)hed->host_addr, 124 (char *)hed->host_addr); 125 af = AF_INET6; 126 len = IN6ADDRSZ; 127 } else { 128 af = AF_INET; 129 len = INADDRSZ; 130 } 131 } else { 132 goto again; 133 } 134 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 135 hed->h_addr_ptrs[1] = NULL; 136 he->h_addr_list = hed->h_addr_ptrs; 137 he->h_length = len; 138 he->h_addrtype = af; 139 while (*cp == ' ' || *cp == '\t') 140 cp++; 141 bp = hed->hostbuf; 142 ep = hed->hostbuf + sizeof hed->hostbuf; 143 he->h_name = bp; 144 q = he->h_aliases = hed->host_aliases; 145 if ((p = strpbrk(cp, " \t")) != NULL) 146 *p++ = '\0'; 147 len = strlen(cp) + 1; 148 if (ep - bp < len) { 149 RES_SET_H_ERRNO(statp, NO_RECOVERY); 150 return (-1); 151 } 152 strlcpy(bp, cp, ep - bp); 153 bp += len; 154 cp = p; 155 while (cp && *cp) { 156 if (*cp == ' ' || *cp == '\t') { 157 cp++; 158 continue; 159 } 160 if (q >= &hed->host_aliases[_MAXALIASES - 1]) 161 break; 162 if ((p = strpbrk(cp, " \t")) != NULL) 163 *p++ = '\0'; 164 len = strlen(cp) + 1; 165 if (ep - bp < len) 166 break; 167 strlcpy(bp, cp, ep - bp); 168 *q++ = bp; 169 bp += len; 170 cp = p; 171 } 172 *q = NULL; 173 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 174 return (0); 175 } 176 177 int 178 gethostent_r(struct hostent *hptr, char *buffer, size_t buflen, 179 struct hostent **result, int *h_errnop) 180 { 181 struct hostent_data *hed; 182 struct hostent he; 183 res_state statp; 184 185 statp = __res_state(); 186 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { 187 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 188 *h_errnop = statp->res_h_errno; 189 return (-1); 190 } 191 if ((hed = __hostent_data_init()) == NULL) { 192 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 193 *h_errnop = statp->res_h_errno; 194 return (-1); 195 } 196 if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0) 197 return (-1); 198 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 199 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 200 *h_errnop = statp->res_h_errno; 201 return ((errno != 0) ? errno : -1); 202 } 203 *result = hptr; 204 return (0); 205 } 206 207 struct hostent * 208 gethostent(void) 209 { 210 struct hostdata *hd; 211 struct hostent *rval; 212 int ret_h_errno; 213 214 if ((hd = __hostdata_init()) == NULL) 215 return (NULL); 216 if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval, 217 &ret_h_errno) != 0) 218 return (NULL); 219 return (rval); 220 } 221 222 int 223 _ht_gethostbyname(void *rval, void *cb_data, va_list ap) 224 { 225 const char *name; 226 int af; 227 char *buffer; 228 size_t buflen; 229 int *errnop, *h_errnop; 230 struct hostent *hptr, he; 231 struct hostent_data *hed; 232 char **cp; 233 res_state statp; 234 int error; 235 236 name = va_arg(ap, const char *); 237 af = va_arg(ap, int); 238 hptr = va_arg(ap, struct hostent *); 239 buffer = va_arg(ap, char *); 240 buflen = va_arg(ap, size_t); 241 errnop = va_arg(ap, int *); 242 h_errnop = va_arg(ap, int *); 243 244 *((struct hostent **)rval) = NULL; 245 246 statp = __res_state(); 247 if ((hed = __hostent_data_init()) == NULL) { 248 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 249 *h_errnop = statp->res_h_errno; 250 return (NS_NOTFOUND); 251 } 252 253 _sethosthtent(0, hed); 254 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) { 255 if (he.h_addrtype != af) 256 continue; 257 if (he.h_addrtype == AF_INET && 258 statp->options & RES_USE_INET6) { 259 _map_v4v6_address(he.h_addr, he.h_addr); 260 he.h_length = IN6ADDRSZ; 261 he.h_addrtype = AF_INET6; 262 } 263 if (strcasecmp(he.h_name, name) == 0) 264 break; 265 for (cp = he.h_aliases; *cp != 0; cp++) 266 if (strcasecmp(*cp, name) == 0) 267 goto found; 268 } 269 found: 270 _endhosthtent(hed); 271 272 if (error != 0) { 273 *h_errnop = statp->res_h_errno; 274 return (NS_NOTFOUND); 275 } 276 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 277 *errnop = errno; 278 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 279 *h_errnop = statp->res_h_errno; 280 return (NS_RETURN); 281 } 282 *((struct hostent **)rval) = hptr; 283 return (NS_SUCCESS); 284 } 285 286 int 287 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap) 288 { 289 const void *addr; 290 socklen_t len; 291 int af; 292 char *buffer; 293 size_t buflen; 294 int *errnop, *h_errnop; 295 struct hostent *hptr, he; 296 struct hostent_data *hed; 297 res_state statp; 298 int error; 299 300 addr = va_arg(ap, const void *); 301 len = va_arg(ap, socklen_t); 302 af = va_arg(ap, int); 303 hptr = va_arg(ap, struct hostent *); 304 buffer = va_arg(ap, char *); 305 buflen = va_arg(ap, size_t); 306 errnop = va_arg(ap, int *); 307 h_errnop = va_arg(ap, int *); 308 309 *((struct hostent **)rval) = NULL; 310 311 statp = __res_state(); 312 if ((hed = __hostent_data_init()) == NULL) { 313 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 314 *h_errnop = statp->res_h_errno; 315 return (NS_NOTFOUND); 316 } 317 318 _sethosthtent(0, hed); 319 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) 320 if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) { 321 if (he.h_addrtype == AF_INET && 322 statp->options & RES_USE_INET6) { 323 _map_v4v6_address(he.h_addr, he.h_addr); 324 he.h_length = IN6ADDRSZ; 325 he.h_addrtype = AF_INET6; 326 } 327 break; 328 } 329 _endhosthtent(hed); 330 331 if (error != 0) 332 return (NS_NOTFOUND); 333 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 334 *errnop = errno; 335 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 336 *h_errnop = statp->res_h_errno; 337 return (NS_RETURN); 338 } 339 *((struct hostent **)rval) = hptr; 340 return (NS_SUCCESS); 341 } 342