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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * - 33 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 34 * 35 * Permission to use, copy, modify, and distribute this software for any 36 * purpose with or without fee is hereby granted, provided that the above 37 * copyright notice and this permission notice appear in all copies, and that 38 * the name of Digital Equipment Corporation not be used in advertising or 39 * publicity pertaining to distribution of the document or software without 40 * specific, written prior permission. 41 * 42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 49 * SOFTWARE. 50 * - 51 * --Copyright-- 52 */ 53 54 #if defined(LIBC_SCCS) && !defined(lint) 55 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 56 #endif /* LIBC_SCCS and not lint */ 57 #include <sys/cdefs.h> 58 __FBSDID("$FreeBSD$"); 59 60 #include <sys/param.h> 61 #include <sys/socket.h> 62 #include <netinet/in.h> 63 #include <arpa/inet.h> 64 #include <netdb.h> 65 #include <stdio.h> 66 #include <ctype.h> 67 #include <string.h> 68 #include <stdarg.h> 69 #include <nsswitch.h> 70 #include <arpa/nameser.h> /* XXX */ 71 #include <resolv.h> /* XXX */ 72 73 #define MAXALIASES 35 74 75 static struct hostent host; 76 static char *host_aliases[MAXALIASES]; 77 static char hostbuf[BUFSIZ+1]; 78 static FILE *hostf = NULL; 79 static u_int32_t host_addr[4]; /* IPv4 or IPv6 */ 80 static char *h_addr_ptrs[2]; 81 static int stayopen = 0; 82 83 void 84 _sethosthtent(f) 85 int f; 86 { 87 if (!hostf) 88 hostf = fopen(_PATH_HOSTS, "r" ); 89 else 90 rewind(hostf); 91 stayopen = f; 92 } 93 94 void 95 _endhosthtent() 96 { 97 if (hostf && !stayopen) { 98 (void) fclose(hostf); 99 hostf = NULL; 100 } 101 } 102 103 struct hostent * 104 gethostent() 105 { 106 char *p; 107 char *cp, **q; 108 int af, len; 109 110 if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { 111 h_errno = NETDB_INTERNAL; 112 return (NULL); 113 } 114 again: 115 if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { 116 h_errno = HOST_NOT_FOUND; 117 return (NULL); 118 } 119 if (*p == '#') 120 goto again; 121 if (!(cp = strpbrk(p, "#\n"))) 122 goto again; 123 *cp = '\0'; 124 if (!(cp = strpbrk(p, " \t"))) 125 goto again; 126 *cp++ = '\0'; 127 if (inet_pton(AF_INET6, p, host_addr) > 0) { 128 af = AF_INET6; 129 len = IN6ADDRSZ; 130 } else if (inet_pton(AF_INET, p, host_addr) > 0) { 131 if (_res.options & RES_USE_INET6) { 132 _map_v4v6_address((char*)host_addr, (char*)host_addr); 133 af = AF_INET6; 134 len = IN6ADDRSZ; 135 } else { 136 af = AF_INET; 137 len = INADDRSZ; 138 } 139 } else { 140 goto again; 141 } 142 h_addr_ptrs[0] = (char *)host_addr; 143 h_addr_ptrs[1] = NULL; 144 host.h_addr_list = h_addr_ptrs; 145 host.h_length = len; 146 host.h_addrtype = af; 147 while (*cp == ' ' || *cp == '\t') 148 cp++; 149 host.h_name = cp; 150 q = host.h_aliases = host_aliases; 151 if ((cp = strpbrk(cp, " \t")) != NULL) 152 *cp++ = '\0'; 153 while (cp && *cp) { 154 if (*cp == ' ' || *cp == '\t') { 155 cp++; 156 continue; 157 } 158 if (q < &host_aliases[MAXALIASES - 1]) 159 *q++ = cp; 160 if ((cp = strpbrk(cp, " \t")) != NULL) 161 *cp++ = '\0'; 162 } 163 *q = NULL; 164 h_errno = NETDB_SUCCESS; 165 return (&host); 166 } 167 168 int 169 _ht_gethostbyname(void *rval, void *cb_data, va_list ap) 170 { 171 const char *name; 172 int af; 173 struct hostent *p; 174 char **cp; 175 176 name = va_arg(ap, const char *); 177 af = va_arg(ap, int); 178 179 sethostent(0); 180 while ((p = gethostent()) != NULL) { 181 if (p->h_addrtype != af) 182 continue; 183 if (strcasecmp(p->h_name, name) == 0) 184 break; 185 for (cp = p->h_aliases; *cp != 0; cp++) 186 if (strcasecmp(*cp, name) == 0) 187 goto found; 188 } 189 found: 190 endhostent(); 191 *(struct hostent **)rval = p; 192 193 return (p != NULL) ? NS_SUCCESS : NS_NOTFOUND; 194 } 195 196 int 197 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap) 198 { 199 const char *addr; 200 int len, af; 201 struct hostent *p; 202 203 addr = va_arg(ap, const char *); 204 len = va_arg(ap, int); 205 af = va_arg(ap, int); 206 207 sethostent(0); 208 while ((p = gethostent()) != NULL) 209 if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) 210 break; 211 endhostent(); 212 213 *(struct hostent **)rval = p; 214 return (p != NULL) ? NS_SUCCESS : NS_NOTFOUND; 215 } 216