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 #include <sys/param.h> 53 #include <sys/socket.h> 54 #include <netinet/in.h> 55 #include <arpa/inet.h> 56 #include <netdb.h> 57 #include <stdio.h> 58 #include <ctype.h> 59 #include <errno.h> 60 #include <string.h> 61 #include <stdarg.h> 62 #include <nsswitch.h> 63 #include <arpa/nameser.h> /* XXX */ 64 #include <resolv.h> /* XXX */ 65 #include "netdb_private.h" 66 67 void 68 _sethosthtent(int f, struct hostent_data *hed) 69 { 70 if (!hed->hostf) 71 hed->hostf = fopen(_PATH_HOSTS, "re"); 72 else 73 rewind(hed->hostf); 74 hed->stayopen = f; 75 } 76 77 void 78 _endhosthtent(struct hostent_data *hed) 79 { 80 if (hed->hostf && !hed->stayopen) { 81 (void) fclose(hed->hostf); 82 hed->hostf = NULL; 83 } 84 } 85 86 static int 87 gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped, 88 res_state statp) 89 { 90 char *p, *bp, *ep; 91 char *cp, **q; 92 int af, len; 93 char hostbuf[BUFSIZ + 1]; 94 95 if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "re"))) { 96 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 97 return (-1); 98 } 99 again: 100 if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) { 101 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 102 return (-1); 103 } 104 if (*p == '#') 105 goto again; 106 cp = strpbrk(p, "#\n"); 107 if (cp != NULL) 108 *cp = '\0'; 109 if (!(cp = strpbrk(p, " \t"))) 110 goto again; 111 *cp++ = '\0'; 112 if (inet_pton(AF_INET6, p, hed->host_addr) > 0) { 113 af = AF_INET6; 114 len = IN6ADDRSZ; 115 } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) { 116 if (mapped) { 117 _map_v4v6_address((char *)hed->host_addr, 118 (char *)hed->host_addr); 119 af = AF_INET6; 120 len = IN6ADDRSZ; 121 } else { 122 af = AF_INET; 123 len = INADDRSZ; 124 } 125 } else { 126 goto again; 127 } 128 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 129 hed->h_addr_ptrs[1] = NULL; 130 he->h_addr_list = hed->h_addr_ptrs; 131 he->h_length = len; 132 he->h_addrtype = af; 133 while (*cp == ' ' || *cp == '\t') 134 cp++; 135 bp = hed->hostbuf; 136 ep = hed->hostbuf + sizeof hed->hostbuf; 137 he->h_name = bp; 138 q = he->h_aliases = hed->host_aliases; 139 if ((p = strpbrk(cp, " \t")) != NULL) 140 *p++ = '\0'; 141 len = strlen(cp) + 1; 142 if (ep - bp < len) { 143 RES_SET_H_ERRNO(statp, NO_RECOVERY); 144 return (-1); 145 } 146 strlcpy(bp, cp, ep - bp); 147 bp += len; 148 cp = p; 149 while (cp && *cp) { 150 if (*cp == ' ' || *cp == '\t') { 151 cp++; 152 continue; 153 } 154 if (q >= &hed->host_aliases[_MAXALIASES - 1]) 155 break; 156 if ((p = strpbrk(cp, " \t")) != NULL) 157 *p++ = '\0'; 158 len = strlen(cp) + 1; 159 if (ep - bp < len) 160 break; 161 strlcpy(bp, cp, ep - bp); 162 *q++ = bp; 163 bp += len; 164 cp = p; 165 } 166 *q = NULL; 167 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 168 return (0); 169 } 170 171 int 172 gethostent_r(struct hostent *hptr, char *buffer, size_t buflen, 173 struct hostent **result, int *h_errnop) 174 { 175 struct hostent_data *hed; 176 struct hostent he; 177 res_state statp; 178 179 statp = __res_state(); 180 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { 181 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 182 *h_errnop = statp->res_h_errno; 183 return (-1); 184 } 185 if ((hed = __hostent_data_init()) == NULL) { 186 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 187 *h_errnop = statp->res_h_errno; 188 return (-1); 189 } 190 if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0) 191 return (-1); 192 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 193 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 194 *h_errnop = statp->res_h_errno; 195 return ((errno != 0) ? errno : -1); 196 } 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 *errnop = errno; 272 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 273 *h_errnop = statp->res_h_errno; 274 return (NS_RETURN); 275 } 276 *((struct hostent **)rval) = hptr; 277 return (NS_SUCCESS); 278 } 279 280 int 281 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap) 282 { 283 const void *addr; 284 socklen_t len; 285 int af; 286 char *buffer; 287 size_t buflen; 288 int *errnop, *h_errnop; 289 struct hostent *hptr, he; 290 struct hostent_data *hed; 291 res_state statp; 292 int error; 293 294 addr = va_arg(ap, const void *); 295 len = va_arg(ap, socklen_t); 296 af = va_arg(ap, int); 297 hptr = va_arg(ap, struct hostent *); 298 buffer = va_arg(ap, char *); 299 buflen = va_arg(ap, size_t); 300 errnop = va_arg(ap, int *); 301 h_errnop = va_arg(ap, int *); 302 303 *((struct hostent **)rval) = NULL; 304 305 statp = __res_state(); 306 if ((hed = __hostent_data_init()) == NULL) { 307 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 308 *h_errnop = statp->res_h_errno; 309 return (NS_NOTFOUND); 310 } 311 312 _sethosthtent(0, hed); 313 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) 314 if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) { 315 if (he.h_addrtype == AF_INET && 316 statp->options & RES_USE_INET6) { 317 _map_v4v6_address(he.h_addr, he.h_addr); 318 he.h_length = IN6ADDRSZ; 319 he.h_addrtype = AF_INET6; 320 } 321 break; 322 } 323 _endhosthtent(hed); 324 325 if (error != 0) 326 return (NS_NOTFOUND); 327 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 328 *errnop = errno; 329 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 330 *h_errnop = statp->res_h_errno; 331 return (NS_RETURN); 332 } 333 *((struct hostent **)rval) = hptr; 334 return (NS_SUCCESS); 335 } 336