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 1.16 2003/01/05 14:05:24 fenner 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 #include <stdarg.h> 41 #include <nsswitch.h> 42 #ifdef YP 43 #include <rpc/rpc.h> 44 #include <rpcsvc/yp_prot.h> 45 #include <rpcsvc/ypclnt.h> 46 #endif 47 48 #define MAXALIASES 35 49 #define MAXADDRS 35 50 51 extern int h_errno; 52 53 #ifdef YP 54 static char *host_aliases[MAXALIASES]; 55 static char hostaddr[MAXADDRS]; 56 static char *host_addrs[2]; 57 58 static struct hostent * 59 _gethostbynis(const char *name, char *map, int af) 60 { 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 in_addr_t addr; 68 69 switch(af) { 70 case AF_INET: 71 size = NS_INADDRSZ; 72 break; 73 default: 74 case AF_INET6: 75 size = NS_IN6ADDRSZ; 76 errno = EAFNOSUPPORT; 77 h_errno = NETDB_INTERNAL; 78 return NULL; 79 } 80 81 if (domain == (char *)NULL) 82 if (yp_get_default_domain (&domain)) { 83 h_errno = NETDB_INTERNAL; 84 return ((struct hostent *)NULL); 85 } 86 87 if (yp_match(domain, map, name, strlen(name), &result, &resultlen)) { 88 h_errno = HOST_NOT_FOUND; 89 return ((struct hostent *)NULL); 90 } 91 92 /* avoid potential memory leak */ 93 bcopy((char *)result, (char *)&ypbuf, resultlen); 94 ypbuf[resultlen] = '\0'; 95 free(result); 96 result = (char *)&ypbuf; 97 98 if ((cp = index(result, '\n'))) 99 *cp = '\0'; 100 101 cp = strpbrk(result, " \t"); 102 *cp++ = '\0'; 103 h.h_addr_list = host_addrs; 104 h.h_addr = hostaddr; 105 addr = inet_addr(result); 106 bcopy((char *)&addr, h.h_addr, size); 107 h.h_length = size; 108 h.h_addrtype = AF_INET; 109 while (*cp == ' ' || *cp == '\t') 110 cp++; 111 h.h_name = cp; 112 q = h.h_aliases = host_aliases; 113 cp = strpbrk(cp, " \t"); 114 if (cp != NULL) 115 *cp++ = '\0'; 116 while (cp && *cp) { 117 if (*cp == ' ' || *cp == '\t') { 118 cp++; 119 continue; 120 } 121 if (q < &host_aliases[MAXALIASES - 1]) 122 *q++ = cp; 123 cp = strpbrk(cp, " \t"); 124 if (cp != NULL) 125 *cp++ = '\0'; 126 } 127 *q = NULL; 128 return (&h); 129 } 130 #endif /* YP */ 131 132 /* XXX _gethostbynisname/_gethostbynisaddr only used by getaddrinfo */ 133 struct hostent * 134 _gethostbynisname(const char *name, int af) 135 { 136 #ifdef YP 137 return _gethostbynis(name, "hosts.byname", af); 138 #else 139 return NULL; 140 #endif 141 } 142 143 struct hostent * 144 _gethostbynisaddr(const char *addr, int len, int af) 145 { 146 #ifdef YP 147 return _gethostbynis(inet_ntoa(*(struct in_addr *)addr), 148 "hosts.byaddr", af); 149 #else 150 return NULL; 151 #endif 152 } 153 154 155 int 156 _nis_gethostbyname(void *rval, void *cb_data, va_list ap) 157 { 158 #ifdef YP 159 const char *name; 160 int af; 161 162 name = va_arg(ap, const char *); 163 af = va_arg(ap, int); 164 165 *(struct hostent **)rval = _gethostbynis(name, "hosts.byname", af); 166 return (*(struct hostent **)rval != NULL) ? NS_SUCCESS : NS_NOTFOUND; 167 #else 168 return NS_UNAVAIL; 169 #endif 170 } 171 172 int 173 _nis_gethostbyaddr(void *rval, void *cb_data, va_list ap) 174 { 175 #ifdef YP 176 const char *addr; 177 int len; 178 int af; 179 180 addr = va_arg(ap, const char *); 181 len = va_arg(ap, int); 182 af = va_arg(ap, int); 183 184 *(struct hostent **)rval =_gethostbynis(inet_ntoa(*(struct in_addr *)addr),"hosts.byaddr", af); 185 return (*(struct hostent **)rval != NULL) ? NS_SUCCESS : NS_NOTFOUND; 186 #else 187 return NS_UNAVAIL; 188 #endif 189 } 190