1 /*- 2 * Copyright (c) 1985, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Portions copyright (c) 1999, 2000 6 * Intel Corporation. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * 23 * This product includes software developed by the University of 24 * California, Berkeley, Intel Corporation, and its contributors. 25 * 26 * 4. Neither the name of University, Intel Corporation, or their respective 27 * contributors may be used to endorse or promote products derived from 28 * this software without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND 31 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 32 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 33 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS, 34 * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 * 42 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 43 * 44 * Permission to use, copy, modify, and distribute this software for any 45 * purpose with or without fee is hereby granted, provided that the above 46 * copyright notice and this permission notice appear in all copies, and that 47 * the name of Digital Equipment Corporation not be used in advertising or 48 * publicity pertaining to distribution of the document or software without 49 * specific, written prior permission. 50 * 51 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 52 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 53 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 54 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 55 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 56 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 57 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 58 * SOFTWARE. 59 * - 60 * --Copyright-- 61 */ 62 63 #if defined(LIBC_SCCS) && !defined(lint) 64 static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93"; 65 static char rcsid[] = "$Id: gethostbyht.c,v 1.1.1.1 2003/11/19 01:51:27 kyu3 Exp $"; 66 #endif /* LIBC_SCCS and not lint */ 67 68 #include <sys/param.h> 69 #include <sys/socket.h> 70 #include <netinet/in.h> 71 #include <arpa/inet.h> 72 #include <netdb.h> 73 #include <stdio.h> 74 #include <ctype.h> 75 #include <errno.h> 76 #include <string.h> 77 #include <arpa/nameser.h> /* XXX */ 78 #include <resolv.h> /* XXX */ 79 #include "Socklib_internals.h" 80 81 #define MAXALIASES 35 82 83 static struct hostent host; 84 static char *host_aliases[MAXALIASES]; 85 static char hostbuf[BUFSIZ+1]; 86 static FILE *hostf = NULL; 87 static u_char host_addr[16]; /* IPv4 or IPv6 */ 88 static char *h_addr_ptrs[2]; 89 static int stayopen = 0; 90 91 void 92 _sethosthtent(int f) 93 { 94 if (!hostf) 95 hostf = fopen(_PATH_HOSTS, "r" ); 96 else 97 rewind(hostf); 98 stayopen = f; 99 } 100 101 void 102 _endhosthtent() 103 { 104 if (hostf && !stayopen) { 105 (void) fclose(hostf); 106 hostf = NULL; 107 } 108 } 109 110 struct hostent * 111 gethostent() 112 { 113 char *p; 114 register char *cp, **q; 115 int af, len; 116 117 if (!hostf && ( NULL == (hostf = fopen(_PATH_HOSTS, "r" )))) { 118 h_errno = NETDB_INTERNAL; 119 return (NULL); 120 } 121 again: 122 if ( NULL == (p = fgets(hostbuf, sizeof hostbuf, hostf))) { 123 h_errno = HOST_NOT_FOUND; 124 return (NULL); 125 } 126 if (*p == '#') 127 goto again; 128 if ( NULL == (cp = strpbrk(p, "#\n"))) 129 goto again; 130 *cp = '\0'; 131 if ( NULL == (cp = strpbrk(p, " \t"))) 132 goto again; 133 *cp++ = '\0'; 134 if (inet_pton(AF_INET6, p, host_addr) > 0) { 135 af = AF_INET6; 136 len = IN6ADDRSZ; 137 } else if (inet_pton(AF_INET, p, host_addr) > 0) { 138 if (_res.options & RES_USE_INET6) { 139 _map_v4v6_address((char*)host_addr, (char*)host_addr); 140 af = AF_INET6; 141 len = IN6ADDRSZ; 142 } else { 143 af = AF_INET; 144 len = INADDRSZ; 145 } 146 } else { 147 goto again; 148 } 149 h_addr_ptrs[0] = (char *)host_addr; 150 h_addr_ptrs[1] = NULL; 151 host.h_addr_list = h_addr_ptrs; 152 host.h_length = len; 153 host.h_addrtype = af; 154 while (*cp == ' ' || *cp == '\t') 155 cp++; 156 host.h_name = cp; 157 q = host.h_aliases = host_aliases; 158 if ((cp = strpbrk(cp, " \t\r")) != NULL) 159 *cp++ = '\0'; 160 while (cp && *cp) { 161 if (*cp == ' ' || *cp == '\t') { 162 cp++; 163 continue; 164 } 165 if (q < &host_aliases[MAXALIASES - 1]) 166 *q++ = cp; 167 if ((cp = strpbrk(cp, " \t\r")) != NULL) 168 *cp++ = '\0'; 169 } 170 *q = NULL; 171 h_errno = NETDB_SUCCESS; 172 return (&host); 173 } 174 175 struct hostent * 176 _gethostbyhtname(const char *name, 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(const char *addr, int len, int af) 198 { 199 register struct hostent *p; 200 201 sethostent(0); 202 while ((p = gethostent()) != NULL) 203 if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len)) 204 break; 205 endhostent(); 206 return (p); 207 } 208
