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/getnetbynis.c,v 1.21 2006/04/15 16:20:27 ume Exp $ 26 * $DragonFly: src/lib/libc/net/getnetbynis.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 <netdb.h> 34 #include <resolv.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 #include <arpa/nameser.h> 43 #ifdef YP 44 #include <rpc/rpc.h> 45 #include <rpcsvc/yp_prot.h> 46 #include <rpcsvc/ypclnt.h> 47 #endif 48 #include "netdb_private.h" 49 50 #ifdef YP 51 static int 52 _getnetbynis(const char *name, char *map, int af, struct netent *ne, 53 struct netent_data *ned) 54 { 55 char *p, *bp, *ep; 56 char *cp, **q; 57 char *result; 58 int resultlen, len; 59 char ypbuf[YPMAXRECORD + 2]; 60 61 switch(af) { 62 case AF_INET: 63 break; 64 default: 65 case AF_INET6: 66 errno = EAFNOSUPPORT; 67 return (-1); 68 } 69 70 if (ned->yp_domain == NULL) 71 if (yp_get_default_domain (&ned->yp_domain)) 72 return (-1); 73 74 if (yp_match(ned->yp_domain, map, name, strlen(name), &result, 75 &resultlen)) 76 return (-1); 77 78 bcopy((char *)result, (char *)&ypbuf, resultlen); 79 ypbuf[resultlen] = '\0'; 80 free(result); 81 result = (char *)&ypbuf; 82 83 if ((cp = index(result, '\n'))) 84 *cp = '\0'; 85 86 cp = strpbrk(result, " \t"); 87 *cp++ = '\0'; 88 bp = ned->netbuf; 89 ep = ned->netbuf + sizeof ned->netbuf; 90 len = strlen(result) + 1; 91 if (ep - bp < len) { 92 RES_SET_H_ERRNO(__res_state(), NO_RECOVERY); 93 return (-1); 94 } 95 strlcpy(bp, result, ep - bp); 96 ne->n_name = bp; 97 bp += len; 98 99 while (*cp == ' ' || *cp == '\t') 100 cp++; 101 102 ne->n_net = inet_network(cp); 103 ne->n_addrtype = AF_INET; 104 105 q = ne->n_aliases = ned->net_aliases; 106 cp = strpbrk(cp, " \t"); 107 if (cp != NULL) 108 *cp++ = '\0'; 109 while (cp && *cp) { 110 if (*cp == ' ' || *cp == '\t') { 111 cp++; 112 continue; 113 } 114 if (q > &ned->net_aliases[_MAXALIASES - 1]) 115 break; 116 p = strpbrk(cp, " \t"); 117 if (p != NULL) 118 *p++ = '\0'; 119 len = strlen(cp) + 1; 120 if (ep - bp < len) 121 break; 122 strlcpy(bp, cp, ep - bp); 123 *q++ = bp; 124 bp += len; 125 cp = p; 126 } 127 *q = NULL; 128 return (0); 129 } 130 #endif /* YP */ 131 132 int 133 _nis_getnetbyname(void *rval, void *cb_data, va_list ap) 134 { 135 #ifdef YP 136 const char *name; 137 char *buffer; 138 size_t buflen; 139 int *errnop, *h_errnop; 140 struct netent *nptr, ne; 141 struct netent_data *ned; 142 res_state statp; 143 144 name = va_arg(ap, const char *); 145 nptr = va_arg(ap, struct netent *); 146 buffer = va_arg(ap, char *); 147 buflen = va_arg(ap, size_t); 148 errnop = va_arg(ap, int *); 149 h_errnop = va_arg(ap, int *); 150 151 statp = __res_state(); 152 if ((ned = __netent_data_init()) == NULL) { 153 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 154 *h_errnop = statp->res_h_errno; 155 return (NS_UNAVAIL); 156 } 157 158 if (_getnetbynis(name, "networks.byname", AF_INET, &ne, ned) != 0) { 159 *h_errnop = statp->res_h_errno; 160 return (NS_NOTFOUND); 161 } 162 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) { 163 *h_errnop = statp->res_h_errno; 164 return (NS_NOTFOUND); 165 } 166 *((struct netent **)rval) = nptr; 167 return (NS_SUCCESS); 168 #else 169 return (NS_UNAVAIL); 170 #endif 171 172 } 173 174 int 175 _nis_getnetbyaddr(void *rval, void *cb_data, va_list ap) 176 { 177 #ifdef YP 178 uint32_t addr; 179 int af; 180 char *buffer; 181 size_t buflen; 182 int *errnop, *h_errnop; 183 struct netent *nptr, ne; 184 struct netent_data *ned; 185 char *str, *cp; 186 uint32_t net2; 187 int nn; 188 unsigned int netbr[4]; 189 char buf[MAXDNAME]; 190 res_state statp; 191 192 addr = va_arg(ap, uint32_t); 193 af = va_arg(ap, int); 194 nptr = va_arg(ap, struct netent *); 195 buffer = va_arg(ap, char *); 196 buflen = va_arg(ap, size_t); 197 errnop = va_arg(ap, int *); 198 h_errnop = va_arg(ap, int *); 199 200 statp = __res_state(); 201 if ((ned = __netent_data_init()) == NULL) { 202 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 203 *h_errnop = statp->res_h_errno; 204 return (NS_UNAVAIL); 205 } 206 207 if (af != AF_INET) { 208 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 209 *h_errnop = statp->res_h_errno; 210 errno = EAFNOSUPPORT; 211 return (NS_UNAVAIL); 212 } 213 214 for (nn = 4, net2 = addr; net2; net2 >>= 8) { 215 netbr[--nn] = net2 & 0xff; 216 } 217 218 switch (nn) { 219 case 3: /* Class A */ 220 sprintf(buf, "%u", netbr[3]); 221 break; 222 case 2: /* Class B */ 223 sprintf(buf, "%u.%u", netbr[2], netbr[3]); 224 break; 225 case 1: /* Class C */ 226 sprintf(buf, "%u.%u.%u", netbr[1], netbr[2], netbr[3]); 227 break; 228 case 0: /* Class D - E */ 229 sprintf(buf, "%u.%u.%u.%u", netbr[0], netbr[1], 230 netbr[2], netbr[3]); 231 break; 232 } 233 234 str = (char *)&buf; 235 cp = str + (strlen(str) - 2); 236 237 while(!strcmp(cp, ".0")) { 238 *cp = '\0'; 239 cp = str + (strlen(str) - 2); 240 } 241 242 if (_getnetbynis(str, "networks.byaddr", af, &ne, ned) != 0) { 243 *h_errnop = statp->res_h_errno; 244 return (NS_NOTFOUND); 245 } 246 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) { 247 *h_errnop = statp->res_h_errno; 248 return (NS_NOTFOUND); 249 } 250 *((struct netent **)rval) = nptr; 251 return (NS_SUCCESS); 252 #else 253 return (NS_UNAVAIL); 254 #endif /* YP */ 255 } 256