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 1.3 2004/10/25 19:38:01 drhodus 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 <errno.h> 66 #include <string.h> 67 #include <arpa/nameser.h> /* XXX */ 68 #include <resolv.h> /* XXX */ 69 70 #define MAXALIASES 35 71 72 static struct hostent host; 73 static char *host_aliases[MAXALIASES]; 74 static char hostbuf[BUFSIZ+1]; 75 static FILE *hostf = NULL; 76 static u_int32_t host_addr[4]; /* IPv4 or IPv6 */ 77 static char *h_addr_ptrs[2]; 78 static int stayopen = 0; 79 80 void 81 _sethosthtent(f) 82 int f; 83 { 84 if (!hostf) 85 hostf = fopen(_PATH_HOSTS, "r" ); 86 else 87 rewind(hostf); 88 stayopen = f; 89 } 90 91 void 92 _endhosthtent() 93 { 94 if (hostf && !stayopen) { 95 (void) fclose(hostf); 96 hostf = NULL; 97 } 98 } 99 100 struct hostent * 101 gethostent() 102 { 103 char *p; 104 char *cp, **q; 105 int af, len; 106 107 if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { 108 h_errno = NETDB_INTERNAL; 109 return (NULL); 110 } 111 again: 112 if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { 113 h_errno = HOST_NOT_FOUND; 114 return (NULL); 115 } 116 if (*p == '#') 117 goto again; 118 if (!(cp = strpbrk(p, "#\n"))) 119 goto again; 120 *cp = '\0'; 121 if (!(cp = strpbrk(p, " \t"))) 122 goto again; 123 *cp++ = '\0'; 124 if (inet_pton(AF_INET6, p, host_addr) > 0) { 125 af = AF_INET6; 126 len = IN6ADDRSZ; 127 } else if (inet_pton(AF_INET, p, host_addr) > 0) { 128 if (_res.options & RES_USE_INET6) { 129 _map_v4v6_address((char*)host_addr, (char*)host_addr); 130 af = AF_INET6; 131 len = IN6ADDRSZ; 132 } else { 133 af = AF_INET; 134 len = INADDRSZ; 135 } 136 } else { 137 goto again; 138 } 139 h_addr_ptrs[0] = (char *)host_addr; 140 h_addr_ptrs[1] = NULL; 141 host.h_addr_list = h_addr_ptrs; 142 host.h_length = len; 143 host.h_addrtype = af; 144 while (*cp == ' ' || *cp == '\t') 145 cp++; 146 host.h_name = cp; 147 q = host.h_aliases = host_aliases; 148 if ((cp = strpbrk(cp, " \t")) != NULL) 149 *cp++ = '\0'; 150 while (cp && *cp) { 151 if (*cp == ' ' || *cp == '\t') { 152 cp++; 153 continue; 154 } 155 if (q < &host_aliases[MAXALIASES - 1]) 156 *q++ = cp; 157 if ((cp = strpbrk(cp, " \t")) != NULL) 158 *cp++ = '\0'; 159 } 160 *q = NULL; 161 h_errno = NETDB_SUCCESS; 162 return (&host); 163 } 164 165 struct hostent * 166 _gethostbyhtname(name, af) 167 const char *name; 168 int af; 169 { 170 struct hostent *p; 171 char **cp; 172 173 sethostent(0); 174 while ((p = gethostent()) != NULL) { 175 if (p->h_addrtype != af) 176 continue; 177 if (strcasecmp(p->h_name, name) == 0) 178 break; 179 for (cp = p->h_aliases; *cp != 0; cp++) 180 if (strcasecmp(*cp, name) == 0) 181 goto found; 182 } 183 found: 184 endhostent(); 185 return (p); 186 } 187 188 struct hostent * 189 _gethostbyhtaddr(addr, len, af) 190 const char *addr; 191 int len, af; 192 { 193 struct hostent *p; 194 195 sethostent(0); 196 while ((p = gethostent()) != NULL) 197 if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) 198 break; 199 endhostent(); 200 return (p); 201 } 202