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 * @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93 50 * $FreeBSD: src/lib/libc/net/gethostbyht.c,v 1.27 2007/01/09 00:28:02 imp Exp $ 51 * $DragonFly: src/lib/libc/net/gethostbyht.c,v 1.6 2005/11/13 02:04:47 swildner Exp $ 52 */ 53 54 #include <sys/param.h> 55 #include <sys/socket.h> 56 #include <netinet/in.h> 57 #include <arpa/inet.h> 58 #include <netdb.h> 59 #include <stdio.h> 60 #include <ctype.h> 61 #include <string.h> 62 #include <stdarg.h> 63 #include <nsswitch.h> 64 #include <arpa/nameser.h> /* XXX */ 65 #include <resolv.h> /* XXX */ 66 #include "netdb_private.h" 67 68 void 69 _sethosthtent(int f, struct hostent_data *hed) 70 { 71 if (!hed->hostf) 72 hed->hostf = fopen(_PATH_HOSTS, "r"); 73 else 74 rewind(hed->hostf); 75 hed->stayopen = f; 76 } 77 78 void 79 _endhosthtent(struct hostent_data *hed) 80 { 81 if (hed->hostf && !hed->stayopen) { 82 fclose(hed->hostf); 83 hed->hostf = NULL; 84 } 85 } 86 87 static int 88 gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped, 89 res_state statp) 90 { 91 char *p, *bp, *ep; 92 char *cp, **q; 93 int af, len; 94 char hostbuf[BUFSIZ + 1]; 95 96 if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "r"))) { 97 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 98 return (-1); 99 } 100 again: 101 if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) { 102 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 103 return (-1); 104 } 105 if (*p == '#') 106 goto again; 107 cp = strpbrk(p, "#\n"); 108 if (cp != NULL) 109 *cp = '\0'; 110 if (!(cp = strpbrk(p, " \t"))) 111 goto again; 112 *cp++ = '\0'; 113 if (inet_pton(AF_INET6, p, hed->host_addr) > 0) { 114 af = AF_INET6; 115 len = IN6ADDRSZ; 116 } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) { 117 if (mapped) { 118 _map_v4v6_address((char *)hed->host_addr, 119 (char *)hed->host_addr); 120 af = AF_INET6; 121 len = IN6ADDRSZ; 122 } else { 123 af = AF_INET; 124 len = INADDRSZ; 125 } 126 } else { 127 goto again; 128 } 129 hed->h_addr_ptrs[0] = (char *)hed->host_addr; 130 hed->h_addr_ptrs[1] = NULL; 131 he->h_addr_list = hed->h_addr_ptrs; 132 he->h_length = len; 133 he->h_addrtype = af; 134 while (*cp == ' ' || *cp == '\t') 135 cp++; 136 bp = hed->hostbuf; 137 ep = hed->hostbuf + sizeof hed->hostbuf; 138 he->h_name = bp; 139 q = he->h_aliases = hed->host_aliases; 140 if ((p = strpbrk(cp, " \t")) != NULL) 141 *p++ = '\0'; 142 len = strlen(cp) + 1; 143 if (ep - bp < len) { 144 RES_SET_H_ERRNO(statp, NO_RECOVERY); 145 return (-1); 146 } 147 strlcpy(bp, cp, ep - bp); 148 bp += len; 149 cp = p; 150 while (cp && *cp) { 151 if (*cp == ' ' || *cp == '\t') { 152 cp++; 153 continue; 154 } 155 if (q >= &hed->host_aliases[_MAXALIASES - 1]) 156 break; 157 if ((p = strpbrk(cp, " \t")) != NULL) 158 *p++ = '\0'; 159 len = strlen(cp) + 1; 160 if (ep - bp < len) 161 break; 162 strlcpy(bp, cp, ep - bp); 163 *q++ = bp; 164 bp += len; 165 cp = p; 166 } 167 *q = NULL; 168 RES_SET_H_ERRNO(statp, NETDB_SUCCESS); 169 return (0); 170 } 171 172 int 173 gethostent_r(struct hostent *hptr, char *buffer, size_t buflen, 174 struct hostent **result, int *h_errnop) 175 { 176 struct hostent_data *hed; 177 struct hostent he; 178 res_state statp; 179 180 statp = __res_state(); 181 if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) { 182 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 183 *h_errnop = statp->res_h_errno; 184 return (-1); 185 } 186 if ((hed = __hostent_data_init()) == NULL) { 187 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 188 *h_errnop = statp->res_h_errno; 189 return (-1); 190 } 191 if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0) 192 return (-1); 193 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) 194 return (-1); 195 *result = hptr; 196 return (0); 197 } 198 199 struct hostent * 200 gethostent(void) 201 { 202 struct hostdata *hd; 203 struct hostent *rval; 204 int ret_h_errno; 205 206 if ((hd = __hostdata_init()) == NULL) 207 return (NULL); 208 if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval, 209 &ret_h_errno) != 0) 210 return (NULL); 211 return (rval); 212 } 213 214 int 215 _ht_gethostbyname(void *rval, void *cb_data, va_list ap) 216 { 217 const char *name; 218 int af; 219 char *buffer; 220 size_t buflen; 221 int *errnop, *h_errnop; 222 struct hostent *hptr, he; 223 struct hostent_data *hed; 224 char **cp; 225 res_state statp; 226 int error; 227 228 name = va_arg(ap, const char *); 229 af = va_arg(ap, int); 230 hptr = va_arg(ap, struct hostent *); 231 buffer = va_arg(ap, char *); 232 buflen = va_arg(ap, size_t); 233 errnop = va_arg(ap, int *); 234 h_errnop = va_arg(ap, int *); 235 236 *((struct hostent **)rval) = NULL; 237 238 statp = __res_state(); 239 if ((hed = __hostent_data_init()) == NULL) { 240 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 241 *h_errnop = statp->res_h_errno; 242 return (NS_NOTFOUND); 243 } 244 245 _sethosthtent(0, hed); 246 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) { 247 if (he.h_addrtype != af) 248 continue; 249 if (he.h_addrtype == AF_INET && 250 statp->options & RES_USE_INET6) { 251 _map_v4v6_address(he.h_addr, he.h_addr); 252 he.h_length = IN6ADDRSZ; 253 he.h_addrtype = AF_INET6; 254 } 255 if (strcasecmp(he.h_name, name) == 0) 256 break; 257 for (cp = he.h_aliases; *cp != 0; cp++) 258 if (strcasecmp(*cp, name) == 0) 259 goto found; 260 } 261 found: 262 _endhosthtent(hed); 263 264 if (error != 0) { 265 *h_errnop = statp->res_h_errno; 266 return (NS_NOTFOUND); 267 } 268 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 269 *h_errnop = statp->res_h_errno; 270 return (NS_NOTFOUND); 271 } 272 *((struct hostent **)rval) = hptr; 273 return (NS_SUCCESS); 274 } 275 276 int 277 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap) 278 { 279 const void *addr; 280 socklen_t len; 281 int af; 282 char *buffer; 283 size_t buflen; 284 int *errnop, *h_errnop; 285 struct hostent *hptr, he; 286 struct hostent_data *hed; 287 res_state statp; 288 int error; 289 290 addr = va_arg(ap, const void *); 291 len = va_arg(ap, socklen_t); 292 af = va_arg(ap, int); 293 hptr = va_arg(ap, struct hostent *); 294 buffer = va_arg(ap, char *); 295 buflen = va_arg(ap, size_t); 296 errnop = va_arg(ap, int *); 297 h_errnop = va_arg(ap, int *); 298 299 *((struct hostent **)rval) = NULL; 300 301 statp = __res_state(); 302 if ((hed = __hostent_data_init()) == NULL) { 303 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 304 *h_errnop = statp->res_h_errno; 305 return (NS_NOTFOUND); 306 } 307 308 _sethosthtent(0, hed); 309 while ((error = gethostent_p(&he, hed, 0, statp)) == 0) 310 if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) { 311 if (he.h_addrtype == AF_INET && 312 statp->options & RES_USE_INET6) { 313 _map_v4v6_address(he.h_addr, he.h_addr); 314 he.h_length = IN6ADDRSZ; 315 he.h_addrtype = AF_INET6; 316 } 317 break; 318 } 319 _endhosthtent(hed); 320 321 if (error != 0) 322 return (NS_NOTFOUND); 323 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 324 *h_errnop = statp->res_h_errno; 325 return (NS_NOTFOUND); 326 } 327 *((struct hostent **)rval) = hptr; 328 return (NS_SUCCESS); 329 } 330