1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1994, Garrett Wollman 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/socket.h> 33 #include <netinet/in.h> 34 #include <arpa/inet.h> 35 #include <arpa/nameser.h> 36 #include <netdb.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <ctype.h> 40 #include <errno.h> 41 #include <string.h> 42 #include <stdarg.h> 43 #include <nsswitch.h> 44 #include <resolv.h> /* XXX */ 45 #ifdef YP 46 #include <rpc/rpc.h> 47 #include <rpcsvc/yp_prot.h> 48 #include <rpcsvc/ypclnt.h> 49 #endif 50 #include "netdb_private.h" 51 52 #ifdef YP 53 static int 54 _gethostbynis(const char *name, char *map, int af, struct hostent *he, 55 struct hostent_data *hed) 56 { 57 char *p, *bp, *ep; 58 char *cp, **q; 59 char *result; 60 int resultlen, size, addrok = 0; 61 char *ypbuf; 62 res_state statp; 63 64 statp = __res_state(); 65 switch(af) { 66 case AF_INET: 67 size = NS_INADDRSZ; 68 break; 69 case AF_INET6: 70 size = NS_IN6ADDRSZ; 71 break; 72 default: 73 errno = EAFNOSUPPORT; 74 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 75 return (-1); 76 } 77 78 if (hed->yp_domain == (char *)NULL) 79 if (yp_get_default_domain (&hed->yp_domain)) { 80 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 81 return (-1); 82 } 83 84 if (yp_match(hed->yp_domain, map, name, strlen(name), &result, 85 &resultlen)) { 86 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 87 return (-1); 88 } 89 90 /* avoid potential memory leak */ 91 ypbuf = alloca(resultlen + 2); 92 bcopy(result, ypbuf, resultlen); 93 ypbuf[resultlen] = '\0'; 94 free(result); 95 result = ypbuf; 96 97 if ((cp = strchr(result, '\n'))) 98 *cp = '\0'; 99 100 cp = strpbrk(result, " \t"); 101 *cp++ = '\0'; 102 he->h_addr_list = hed->h_addr_ptrs; 103 he->h_addr = (char *)hed->host_addr; 104 switch (af) { 105 case AF_INET: 106 addrok = inet_aton(result, (struct in_addr *)hed->host_addr); 107 if (addrok != 1) 108 break; 109 if (statp->options & RES_USE_INET6) { 110 _map_v4v6_address((char *)hed->host_addr, 111 (char *)hed->host_addr); 112 af = AF_INET6; 113 size = NS_IN6ADDRSZ; 114 } 115 break; 116 case AF_INET6: 117 addrok = inet_pton(af, result, hed->host_addr); 118 break; 119 } 120 if (addrok != 1) { 121 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); 122 return (-1); 123 } 124 he->h_addr_list[1] = NULL; 125 he->h_length = size; 126 he->h_addrtype = af; 127 while (*cp == ' ' || *cp == '\t') 128 cp++; 129 bp = hed->hostbuf; 130 ep = hed->hostbuf + sizeof hed->hostbuf; 131 he->h_name = bp; 132 q = he->h_aliases = hed->host_aliases; 133 p = strpbrk(cp, " \t"); 134 if (p != NULL) 135 *p++ = '\0'; 136 size = strlen(cp) + 1; 137 if (ep - bp < size) { 138 RES_SET_H_ERRNO(statp, NO_RECOVERY); 139 return (-1); 140 } 141 strlcpy(bp, cp, ep - bp); 142 bp += size; 143 cp = p; 144 while (cp && *cp) { 145 if (*cp == ' ' || *cp == '\t') { 146 cp++; 147 continue; 148 } 149 if (q >= &hed->host_aliases[_MAXALIASES - 1]) 150 break; 151 p = strpbrk(cp, " \t"); 152 if (p != NULL) 153 *p++ = '\0'; 154 size = strlen(cp) + 1; 155 if (ep - bp < size) 156 break; 157 strlcpy(bp, cp, ep - bp); 158 *q++ = bp; 159 bp += size; 160 cp = p; 161 } 162 *q = NULL; 163 return (0); 164 } 165 166 static int 167 _gethostbynisname_r(const char *name, int af, struct hostent *he, 168 struct hostent_data *hed) 169 { 170 char *map; 171 172 switch (af) { 173 case AF_INET: 174 map = "hosts.byname"; 175 break; 176 default: 177 map = "ipnodes.byname"; 178 break; 179 } 180 return (_gethostbynis(name, map, af, he, hed)); 181 } 182 183 static int 184 _gethostbynisaddr_r(const void *addr, socklen_t len, int af, 185 struct hostent *he, struct hostent_data *hed) 186 { 187 char *map; 188 char numaddr[46]; 189 190 switch (af) { 191 case AF_INET: 192 map = "hosts.byaddr"; 193 break; 194 default: 195 map = "ipnodes.byaddr"; 196 break; 197 } 198 if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL) 199 return (-1); 200 return (_gethostbynis(numaddr, map, af, he, hed)); 201 } 202 #endif /* YP */ 203 204 int 205 _nis_gethostbyname(void *rval, void *cb_data, va_list ap) 206 { 207 #ifdef YP 208 const char *name; 209 int af; 210 char *buffer; 211 size_t buflen; 212 int *errnop, *h_errnop; 213 struct hostent *hptr, he; 214 struct hostent_data *hed; 215 res_state statp; 216 217 name = va_arg(ap, const char *); 218 af = va_arg(ap, int); 219 hptr = va_arg(ap, struct hostent *); 220 buffer = va_arg(ap, char *); 221 buflen = va_arg(ap, size_t); 222 errnop = va_arg(ap, int *); 223 h_errnop = va_arg(ap, int *); 224 225 *((struct hostent **)rval) = NULL; 226 227 statp = __res_state(); 228 if ((hed = __hostent_data_init()) == NULL) { 229 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 230 *h_errnop = statp->res_h_errno; 231 return (NS_NOTFOUND); 232 } 233 234 if (_gethostbynisname_r(name, af, &he, hed) != 0) { 235 *h_errnop = statp->res_h_errno; 236 return (NS_NOTFOUND); 237 } 238 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 239 *errnop = errno; 240 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 241 *h_errnop = statp->res_h_errno; 242 return (NS_RETURN); 243 } 244 *((struct hostent **)rval) = hptr; 245 return (NS_SUCCESS); 246 #else 247 *((struct hostent **)rval) = NULL; 248 return (NS_UNAVAIL); 249 #endif 250 } 251 252 int 253 _nis_gethostbyaddr(void *rval, void *cb_data, va_list ap) 254 { 255 #ifdef YP 256 const void *addr; 257 socklen_t len; 258 int af; 259 char *buffer; 260 size_t buflen; 261 int *errnop, *h_errnop; 262 struct hostent *hptr, he; 263 struct hostent_data *hed; 264 res_state statp; 265 266 addr = va_arg(ap, const void *); 267 len = va_arg(ap, socklen_t); 268 af = va_arg(ap, int); 269 hptr = va_arg(ap, struct hostent *); 270 buffer = va_arg(ap, char *); 271 buflen = va_arg(ap, size_t); 272 errnop = va_arg(ap, int *); 273 h_errnop = va_arg(ap, int *); 274 275 *((struct hostent **)rval) = NULL; 276 277 statp = __res_state(); 278 if ((hed = __hostent_data_init()) == NULL) { 279 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 280 *h_errnop = statp->res_h_errno; 281 return (NS_NOTFOUND); 282 } 283 284 if (_gethostbynisaddr_r(addr, len, af, &he, hed) != 0) { 285 *h_errnop = statp->res_h_errno; 286 return (NS_NOTFOUND); 287 } 288 if (__copy_hostent(&he, hptr, buffer, buflen) != 0) { 289 *errnop = errno; 290 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 291 *h_errnop = statp->res_h_errno; 292 return (NS_RETURN); 293 } 294 *((struct hostent **)rval) = hptr; 295 return (NS_SUCCESS); 296 #else 297 *((struct hostent **)rval) = NULL; 298 return (NS_UNAVAIL); 299 #endif 300 } 301