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 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 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(name, map, af) 60 const char *name; 61 char *map; 62 int af; 63 { 64 char *cp, **q; 65 char *result; 66 int resultlen,size; 67 static struct hostent h; 68 static char *domain = (char *)NULL; 69 static char ypbuf[YPMAXRECORD + 2]; 70 in_addr_t addr; 71 72 switch(af) { 73 case AF_INET: 74 size = NS_INADDRSZ; 75 break; 76 default: 77 case AF_INET6: 78 size = NS_IN6ADDRSZ; 79 errno = EAFNOSUPPORT; 80 h_errno = NETDB_INTERNAL; 81 return NULL; 82 } 83 84 if (domain == (char *)NULL) 85 if (yp_get_default_domain (&domain)) { 86 h_errno = NETDB_INTERNAL; 87 return ((struct hostent *)NULL); 88 } 89 90 if (yp_match(domain, map, name, strlen(name), &result, &resultlen)) { 91 h_errno = HOST_NOT_FOUND; 92 return ((struct hostent *)NULL); 93 } 94 95 /* avoid potential memory leak */ 96 bcopy((char *)result, (char *)&ypbuf, resultlen); 97 ypbuf[resultlen] = '\0'; 98 free(result); 99 result = (char *)&ypbuf; 100 101 if ((cp = index(result, '\n'))) 102 *cp = '\0'; 103 104 cp = strpbrk(result, " \t"); 105 *cp++ = '\0'; 106 h.h_addr_list = host_addrs; 107 h.h_addr = hostaddr; 108 addr = inet_addr(result); 109 bcopy((char *)&addr, h.h_addr, size); 110 h.h_length = size; 111 h.h_addrtype = AF_INET; 112 while (*cp == ' ' || *cp == '\t') 113 cp++; 114 h.h_name = cp; 115 q = h.h_aliases = host_aliases; 116 cp = strpbrk(cp, " \t"); 117 if (cp != NULL) 118 *cp++ = '\0'; 119 while (cp && *cp) { 120 if (*cp == ' ' || *cp == '\t') { 121 cp++; 122 continue; 123 } 124 if (q < &host_aliases[MAXALIASES - 1]) 125 *q++ = cp; 126 cp = strpbrk(cp, " \t"); 127 if (cp != NULL) 128 *cp++ = '\0'; 129 } 130 *q = NULL; 131 return (&h); 132 } 133 #endif /* YP */ 134 135 /* XXX _gethostbynisname/_gethostbynisaddr only used by getaddrinfo */ 136 struct hostent * 137 _gethostbynisname(const char *name, int af) 138 { 139 #ifdef YP 140 return _gethostbynis(name, "hosts.byname", af); 141 #else 142 return NULL; 143 #endif 144 } 145 146 struct hostent * 147 _gethostbynisaddr(const char *addr, int len, int af) 148 { 149 #ifdef YP 150 return _gethostbynis(inet_ntoa(*(struct in_addr *)addr), 151 "hosts.byaddr", af); 152 #else 153 return NULL; 154 #endif 155 } 156 157 158 int 159 _nis_gethostbyname(void *rval, void *cb_data, va_list ap) 160 { 161 #ifdef YP 162 const char *name; 163 int af; 164 165 name = va_arg(ap, const char *); 166 af = va_arg(ap, int); 167 168 *(struct hostent **)rval = _gethostbynis(name, "hosts.byname", af); 169 return (*(struct hostent **)rval != NULL) ? NS_SUCCESS : NS_NOTFOUND; 170 #else 171 return NS_UNAVAIL; 172 #endif 173 } 174 175 int 176 _nis_gethostbyaddr(void *rval, void *cb_data, va_list ap) 177 { 178 #ifdef YP 179 const char *addr; 180 int len; 181 int af; 182 183 addr = va_arg(ap, const char *); 184 len = va_arg(ap, int); 185 af = va_arg(ap, int); 186 187 *(struct hostent **)rval =_gethostbynis(inet_ntoa(*(struct in_addr *)addr),"hosts.byaddr", af); 188 return (*(struct hostent **)rval != NULL) ? NS_SUCCESS : NS_NOTFOUND; 189 #else 190 return NS_UNAVAIL; 191 #endif 192 } 193