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 #if defined(LIBC_SCCS) && !defined(lint) 27 static char sccsid[] = "@(#)$Id: getnetbynis.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 Exp $"; 28 static char rcsid[] = "$Id: getnetbynis.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 Exp $"; 29 #endif /* LIBC_SCCS and not lint */ 30 31 #include <sys/param.h> 32 #include <sys/socket.h> 33 #include <netinet/in.h> 34 #include <arpa/inet.h> 35 #include <netdb.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <ctype.h> 39 #include <errno.h> 40 #include <string.h> 41 #include <arpa/nameser.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 #ifdef YP 52 static char *host_aliases[MAXALIASES]; 53 #endif /* YP */ 54 55 static struct netent * 56 _getnetbynis(const char *name, char *map, int af) 57 { 58 #ifdef YP 59 register char *cp, **q; 60 static char *result; 61 int resultlen; 62 static struct netent h; 63 static char *domain = (char *)NULL; 64 static char ypbuf[YPMAXRECORD + 2]; 65 66 switch(af) { 67 case AF_INET: 68 break; 69 default: 70 case AF_INET6: 71 errno = EAFNOSUPPORT; 72 return NULL; 73 } 74 75 if (domain == (char *)NULL) 76 if (yp_get_default_domain (&domain)) 77 return (NULL); 78 79 if (yp_match(domain, map, name, strlen(name), &result, &resultlen)) 80 return (NULL); 81 82 bcopy((char *)result, (char *)&ypbuf, resultlen); 83 ypbuf[resultlen] = '\0'; 84 free(result); 85 result = (char *)&ypbuf; 86 87 if ((cp = index(result, '\n'))) 88 *cp = '\0'; 89 90 cp = strpbrk(result, " \t"); 91 *cp++ = '\0'; 92 h.n_name = result; 93 94 while (*cp == ' ' || *cp == '\t') 95 cp++; 96 97 h.n_net = inet_network(cp); 98 h.n_addrtype = AF_INET; 99 100 q = h.n_aliases = host_aliases; 101 cp = strpbrk(cp, " \t"); 102 if (cp != NULL) 103 *cp++ = '\0'; 104 while (cp && *cp) { 105 if (*cp == ' ' || *cp == '\t') { 106 cp++; 107 continue; 108 } 109 if (q < &host_aliases[MAXALIASES - 1]) 110 *q++ = cp; 111 cp = strpbrk(cp, " \t"); 112 if (cp != NULL) 113 *cp++ = '\0'; 114 } 115 *q = NULL; 116 return (&h); 117 #else 118 return (NULL); 119 #endif 120 } 121 122 struct netent * 123 _getnetbynisname(const char *name) 124 { 125 return _getnetbynis(name, "networks.byname", AF_INET); 126 } 127 128 struct netent * 129 _getnetbynisaddr(unsigned long addr, int af) 130 { 131 char *str, *cp; 132 unsigned long net2; 133 int nn; 134 unsigned int netbr[4]; 135 char buf[MAXDNAME]; 136 137 if (af != AF_INET) { 138 errno = EAFNOSUPPORT; 139 return (NULL); 140 } 141 142 for (nn = 4, net2 = addr; net2; net2 >>= 8) { 143 netbr[--nn] = net2 & 0xff; 144 } 145 146 switch (nn) { 147 case 3: /* Class A */ 148 sprintf(buf, "%u", netbr[3]); 149 break; 150 case 2: /* Class B */ 151 sprintf(buf, "%u.%u", netbr[2], netbr[3]); 152 break; 153 case 1: /* Class C */ 154 sprintf(buf, "%u.%u.%u", netbr[1], netbr[2], netbr[3]); 155 break; 156 case 0: /* Class D - E */ 157 sprintf(buf, "%u.%u.%u.%u", netbr[0], netbr[1], 158 netbr[2], netbr[3]); 159 break; 160 } 161 162 str = (char *)&buf; 163 cp = str + (strlen(str) - 2); 164 165 while(!strcmp(cp, ".0")) { 166 *cp = '\0'; 167 cp = str + (strlen(str) - 2); 168 } 169 170 return _getnetbynis(str, "networks.byaddr", af); 171 } 172
