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 * @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93 54 * $FreeBSD: src/lib/libc/net/gethostbyht.c,v 1.12 1999/08/28 00:00:05 peter Exp $ 55 * $DragonFly: src/lib/libc/net/gethostbyht.c,v 1.4 2005/01/31 22:29:33 dillon Exp $ 56 */ 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 <string.h> 66 #include <arpa/nameser.h> /* XXX */ 67 #include <resolv.h> /* XXX */ 68 69 #define MAXALIASES 35 70 71 static struct hostent host; 72 static char *host_aliases[MAXALIASES]; 73 static char hostbuf[BUFSIZ+1]; 74 static FILE *hostf = NULL; 75 static u_int32_t host_addr[4]; /* IPv4 or IPv6 */ 76 static char *h_addr_ptrs[2]; 77 static int stayopen = 0; 78 79 void 80 _sethosthtent(f) 81 int f; 82 { 83 if (!hostf) 84 hostf = fopen(_PATH_HOSTS, "r" ); 85 else 86 rewind(hostf); 87 stayopen = f; 88 } 89 90 void 91 _endhosthtent() 92 { 93 if (hostf && !stayopen) { 94 (void) fclose(hostf); 95 hostf = NULL; 96 } 97 } 98 99 struct hostent * 100 gethostent() 101 { 102 char *p; 103 char *cp, **q; 104 int af, len; 105 106 if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { 107 h_errno = NETDB_INTERNAL; 108 return (NULL); 109 } 110 again: 111 if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { 112 h_errno = HOST_NOT_FOUND; 113 return (NULL); 114 } 115 if (*p == '#') 116 goto again; 117 if (!(cp = strpbrk(p, "#\n"))) 118 goto again; 119 *cp = '\0'; 120 if (!(cp = strpbrk(p, " \t"))) 121 goto again; 122 *cp++ = '\0'; 123 if (inet_pton(AF_INET6, p, host_addr) > 0) { 124 af = AF_INET6; 125 len = IN6ADDRSZ; 126 } else if (inet_pton(AF_INET, p, host_addr) > 0) { 127 if (_res.options & RES_USE_INET6) { 128 _map_v4v6_address((char*)host_addr, (char*)host_addr); 129 af = AF_INET6; 130 len = IN6ADDRSZ; 131 } else { 132 af = AF_INET; 133 len = INADDRSZ; 134 } 135 } else { 136 goto again; 137 } 138 h_addr_ptrs[0] = (char *)host_addr; 139 h_addr_ptrs[1] = NULL; 140 host.h_addr_list = h_addr_ptrs; 141 host.h_length = len; 142 host.h_addrtype = af; 143 while (*cp == ' ' || *cp == '\t') 144 cp++; 145 host.h_name = cp; 146 q = host.h_aliases = host_aliases; 147 if ((cp = strpbrk(cp, " \t")) != NULL) 148 *cp++ = '\0'; 149 while (cp && *cp) { 150 if (*cp == ' ' || *cp == '\t') { 151 cp++; 152 continue; 153 } 154 if (q < &host_aliases[MAXALIASES - 1]) 155 *q++ = cp; 156 if ((cp = strpbrk(cp, " \t")) != NULL) 157 *cp++ = '\0'; 158 } 159 *q = NULL; 160 h_errno = NETDB_SUCCESS; 161 return (&host); 162 } 163 164 struct hostent * 165 _gethostbyhtname(name, af) 166 const char *name; 167 int af; 168 { 169 struct hostent *p; 170 char **cp; 171 172 sethostent(0); 173 while ((p = gethostent()) != NULL) { 174 if (p->h_addrtype != af) 175 continue; 176 if (strcasecmp(p->h_name, name) == 0) 177 break; 178 for (cp = p->h_aliases; *cp != 0; cp++) 179 if (strcasecmp(*cp, name) == 0) 180 goto found; 181 } 182 found: 183 endhostent(); 184 return (p); 185 } 186 187 struct hostent * 188 _gethostbyhtaddr(addr, len, af) 189 const char *addr; 190 int len, af; 191 { 192 struct hostent *p; 193 194 sethostent(0); 195 while ((p = gethostent()) != NULL) 196 if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) 197 break; 198 endhostent(); 199 return (p); 200 } 201