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[] = "$Id$"; 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 ((_res.options & RES_USE_INET6) && 126 inet_pton(AF_INET6, p, host_addr) > 0) { 127 af = AF_INET6; 128 len = IN6ADDRSZ; 129 } else if (inet_pton(AF_INET, p, host_addr) > 0) { 130 if (_res.options & RES_USE_INET6) { 131 _map_v4v6_address((char*)host_addr, (char*)host_addr); 132 af = AF_INET6; 133 len = IN6ADDRSZ; 134 } else { 135 af = AF_INET; 136 len = INADDRSZ; 137 } 138 } else { 139 goto again; 140 } 141 h_addr_ptrs[0] = (char *)host_addr; 142 h_addr_ptrs[1] = NULL; 143 host.h_addr_list = h_addr_ptrs; 144 host.h_length = len; 145 host.h_addrtype = af; 146 while (*cp == ' ' || *cp == '\t') 147 cp++; 148 host.h_name = cp; 149 q = host.h_aliases = host_aliases; 150 if ((cp = strpbrk(cp, " \t")) != NULL) 151 *cp++ = '\0'; 152 while (cp && *cp) { 153 if (*cp == ' ' || *cp == '\t') { 154 cp++; 155 continue; 156 } 157 if (q < &host_aliases[MAXALIASES - 1]) 158 *q++ = cp; 159 if ((cp = strpbrk(cp, " \t")) != NULL) 160 *cp++ = '\0'; 161 } 162 *q = NULL; 163 if (_res.options & RES_USE_INET6) { 164 char *bp = hostbuf; 165 int buflen = sizeof hostbuf; 166 167 _map_v4v6_hostent(&host, &bp, &buflen); 168 } 169 h_errno = NETDB_SUCCESS; 170 return (&host); 171 } 172 173 struct hostent * 174 _gethostbyhtname(name, af) 175 const char *name; 176 int af; 177 { 178 register struct hostent *p; 179 register char **cp; 180 181 sethostent(0); 182 while ((p = gethostent()) != NULL) { 183 if (p->h_addrtype != af) 184 continue; 185 if (strcasecmp(p->h_name, name) == 0) 186 break; 187 for (cp = p->h_aliases; *cp != 0; cp++) 188 if (strcasecmp(*cp, name) == 0) 189 goto found; 190 } 191 found: 192 endhostent(); 193 return (p); 194 } 195 196 struct hostent * 197 _gethostbyhtaddr(addr, len, af) 198 const char *addr; 199 int len, af; 200 { 201 register struct hostent *p; 202 203 sethostent(0); 204 while ((p = gethostent()) != NULL) 205 if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) 206 break; 207 endhostent(); 208 return (p); 209 } 210