1 /*- 2 * Copyright (c) 1994, Garrett Wollman 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD: src/lib/libc/net/gethostbynis.c,v 1.10.2.1 2000/10/01 16:39:47 nectar Exp $ 26 * $DragonFly: src/lib/libc/net/gethostbynis.c,v 1.4 2005/11/13 02:04:47 swildner Exp $ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/socket.h> 31 #include <netinet/in.h> 32 #include <arpa/inet.h> 33 #include <arpa/nameser.h> 34 #include <netdb.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <ctype.h> 38 #include <errno.h> 39 #include <string.h> 40 #ifdef YP 41 #include <rpc/rpc.h> 42 #include <rpcsvc/yp_prot.h> 43 #include <rpcsvc/ypclnt.h> 44 #endif 45 46 #define MAXALIASES 35 47 #define MAXADDRS 35 48 49 extern int h_errno; 50 51 #ifdef YP 52 static char *host_aliases[MAXALIASES]; 53 static char hostaddr[MAXADDRS]; 54 static char *host_addrs[2]; 55 #endif /* YP */ 56 57 static struct hostent * 58 _gethostbynis(const char *name, char *map, int af) 59 { 60 #ifdef YP 61 char *cp, **q; 62 char *result; 63 int resultlen,size; 64 static struct hostent h; 65 static char *domain = (char *)NULL; 66 static char ypbuf[YPMAXRECORD + 2]; 67 68 switch(af) { 69 case AF_INET: 70 size = NS_INADDRSZ; 71 break; 72 default: 73 case AF_INET6: 74 size = NS_IN6ADDRSZ; 75 errno = EAFNOSUPPORT; 76 h_errno = NETDB_INTERNAL; 77 return NULL; 78 } 79 80 if (domain == (char *)NULL) 81 if (yp_get_default_domain (&domain)) { 82 h_errno = NETDB_INTERNAL; 83 return ((struct hostent *)NULL); 84 } 85 86 if (yp_match(domain, map, name, strlen(name), &result, &resultlen)) { 87 h_errno = HOST_NOT_FOUND; 88 return ((struct hostent *)NULL); 89 } 90 91 /* avoid potential memory leak */ 92 bcopy((char *)result, (char *)&ypbuf, resultlen); 93 ypbuf[resultlen] = '\0'; 94 free(result); 95 result = (char *)&ypbuf; 96 97 if ((cp = index(result, '\n'))) 98 *cp = '\0'; 99 100 cp = strpbrk(result, " \t"); 101 *cp++ = '\0'; 102 h.h_addr_list = host_addrs; 103 h.h_addr = hostaddr; 104 *((u_long *)h.h_addr) = inet_addr(result); 105 h.h_length = size; 106 h.h_addrtype = AF_INET; 107 while (*cp == ' ' || *cp == '\t') 108 cp++; 109 h.h_name = cp; 110 q = h.h_aliases = host_aliases; 111 cp = strpbrk(cp, " \t"); 112 if (cp != NULL) 113 *cp++ = '\0'; 114 while (cp && *cp) { 115 if (*cp == ' ' || *cp == '\t') { 116 cp++; 117 continue; 118 } 119 if (q < &host_aliases[MAXALIASES - 1]) 120 *q++ = cp; 121 cp = strpbrk(cp, " \t"); 122 if (cp != NULL) 123 *cp++ = '\0'; 124 } 125 *q = NULL; 126 return (&h); 127 #else 128 return (NULL); 129 #endif /* YP */ 130 } 131 132 struct hostent * 133 _gethostbynisname(const char *name, int af) 134 { 135 return _gethostbynis(name, "hosts.byname", af); 136 } 137 138 struct hostent * 139 _gethostbynisaddr(const char *addr, int len, int af) 140 { 141 return _gethostbynis(inet_ntoa(*(struct in_addr *)addr),"hosts.byaddr", af); 142 } 143