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 static char rcsid[] = "$Id: gethostbyht.c,v 1.9 1997/02/22 15:00:07 peter Exp $"; 57 #endif /* LIBC_SCCS and not lint */ 58 59 #include <sys/param.h> 60 #include <sys/socket.h> 61 #include <netinet/in.h> 62 #include <arpa/inet.h> 63 #include <netdb.h> 64 #include <stdio.h> 65 #include <ctype.h> 66 #include <errno.h> 67 #include <string.h> 68 #include <arpa/nameser.h> /* XXX */ 69 #include <resolv.h> /* XXX */ 70 71 #define MAXALIASES 35 72 73 static struct hostent host; 74 static char *host_aliases[MAXALIASES]; 75 static char hostbuf[BUFSIZ+1]; 76 static FILE *hostf = NULL; 77 static u_char host_addr[16]; /* IPv4 or IPv6 */ 78 static char *h_addr_ptrs[2]; 79 static int stayopen = 0; 80 81 void 82 _sethosthtent(f) 83 int f; 84 { 85 if (!hostf) 86 hostf = fopen(_PATH_HOSTS, "r" ); 87 else 88 rewind(hostf); 89 stayopen = f; 90 } 91 92 void 93 _endhosthtent() 94 { 95 if (hostf && !stayopen) { 96 (void) fclose(hostf); 97 hostf = NULL; 98 } 99 } 100 101 struct hostent * 102 gethostent() 103 { 104 char *p; 105 register char *cp, **q; 106 int af, len; 107 108 if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) { 109 h_errno = NETDB_INTERNAL; 110 return (NULL); 111 } 112 again: 113 if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) { 114 h_errno = HOST_NOT_FOUND; 115 return (NULL); 116 } 117 if (*p == '#') 118 goto again; 119 if (!(cp = strpbrk(p, "#\n"))) 120 goto again; 121 *cp = '\0'; 122 if (!(cp = strpbrk(p, " \t"))) 123 goto again; 124 *cp++ = '\0'; 125 if (inet_pton(AF_INET6, p, host_addr) > 0) { 126 af = AF_INET6; 127 len = IN6ADDRSZ; 128 } else if (inet_pton(AF_INET, p, host_addr) > 0) { 129 if (_res.options & RES_USE_INET6) { 130 _map_v4v6_address((char*)host_addr, (char*)host_addr); 131 af = AF_INET6; 132 len = IN6ADDRSZ; 133 } else { 134 af = AF_INET; 135 len = INADDRSZ; 136 } 137 } else { 138 goto again; 139 } 140 h_addr_ptrs[0] = (char *)host_addr; 141 h_addr_ptrs[1] = NULL; 142 host.h_addr_list = h_addr_ptrs; 143 host.h_length = len; 144 host.h_addrtype = af; 145 while (*cp == ' ' || *cp == '\t') 146 cp++; 147 host.h_name = cp; 148 q = host.h_aliases = host_aliases; 149 if ((cp = strpbrk(cp, " \t")) != NULL) 150 *cp++ = '\0'; 151 while (cp && *cp) { 152 if (*cp == ' ' || *cp == '\t') { 153 cp++; 154 continue; 155 } 156 if (q < &host_aliases[MAXALIASES - 1]) 157 *q++ = cp; 158 if ((cp = strpbrk(cp, " \t")) != NULL) 159 *cp++ = '\0'; 160 } 161 *q = NULL; 162 h_errno = NETDB_SUCCESS; 163 return (&host); 164 } 165 166 struct hostent * 167 _gethostbyhtname(name, af) 168 const char *name; 169 int af; 170 { 171 register struct hostent *p; 172 register char **cp; 173 174 sethostent(0); 175 while ((p = gethostent()) != NULL) { 176 if (p->h_addrtype != af) 177 continue; 178 if (strcasecmp(p->h_name, name) == 0) 179 break; 180 for (cp = p->h_aliases; *cp != 0; cp++) 181 if (strcasecmp(*cp, name) == 0) 182 goto found; 183 } 184 found: 185 endhostent(); 186 return (p); 187 } 188 189 struct hostent * 190 _gethostbyhtaddr(addr, len, af) 191 const char *addr; 192 int len, af; 193 { 194 register struct hostent *p; 195 196 sethostent(0); 197 while ((p = gethostent()) != NULL) 198 if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) 199 break; 200 endhostent(); 201 return (p); 202 } 203