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: gethostnamadr.c,v 1.1 1994/05/27 04:57:16 rgrimes 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 69 #define MAXALIASES 35 70 #define MAXADDRS 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 char hostaddr[MAXADDRS]; 77 static char *host_addrs[2]; 78 static int stayopen = 0; 79 80 void 81 _sethosthtent(f) 82 int f; 83 { 84 if (hostf == NULL) 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 register char *cp, **q; 105 106 if (hostf == NULL && (hostf = fopen(_PATH_HOSTS, "r" )) == NULL) 107 return (NULL); 108 again: 109 if ((p = fgets(hostbuf, BUFSIZ, hostf)) == NULL) 110 return (NULL); 111 if (*p == '#') 112 goto again; 113 cp = strpbrk(p, "#\n"); 114 if (cp == NULL) 115 goto again; 116 *cp = '\0'; 117 cp = strpbrk(p, " \t"); 118 if (cp == NULL) 119 goto again; 120 *cp++ = '\0'; 121 /* THIS STUFF IS INTERNET SPECIFIC */ 122 host.h_addr_list = host_addrs; 123 host.h_addr = hostaddr; 124 *((u_int32_t *)host.h_addr) = inet_addr(p); 125 host.h_length = sizeof (u_int32_t); 126 host.h_addrtype = AF_INET; 127 while (*cp == ' ' || *cp == '\t') 128 cp++; 129 host.h_name = cp; 130 q = host.h_aliases = host_aliases; 131 cp = strpbrk(cp, " \t"); 132 if (cp != NULL) 133 *cp++ = '\0'; 134 while (cp && *cp) { 135 if (*cp == ' ' || *cp == '\t') { 136 cp++; 137 continue; 138 } 139 if (q < &host_aliases[MAXALIASES - 1]) 140 *q++ = cp; 141 cp = strpbrk(cp, " \t"); 142 if (cp != NULL) 143 *cp++ = '\0'; 144 } 145 *q = NULL; 146 return (&host); 147 } 148 149 struct hostent * 150 _gethostbyhtname(name) 151 char *name; 152 { 153 register struct hostent *p; 154 register char **cp; 155 156 sethostent(0); 157 while ((p = gethostent())) { 158 if (strcasecmp(p->h_name, name) == 0) 159 break; 160 for (cp = p->h_aliases; *cp != 0; cp++) 161 if (strcasecmp(*cp, name) == 0) 162 goto found; 163 } 164 found: 165 endhostent(); 166 return (p); 167 } 168 169 struct hostent * 170 _gethostbyhtaddr(addr, len, type) 171 const char *addr; 172 int len, type; 173 { 174 register struct hostent *p; 175 176 sethostent(0); 177 while ((p = gethostent())) 178 if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len)) 179 break; 180 endhostent(); 181 return (p); 182 } 183