1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)getnetent.c 8.1 (Berkeley) 6/4/93 30 * From: Id: getnetent.c,v 8.4 1997/06/01 20:34:37 vixie Exp 31 * $FreeBSD: src/lib/libc/net/getnetbyht.c,v 1.19 2007/01/09 00:28:02 imp Exp $ 32 */ 33 34 /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro 35 * Dep. Matematica Universidade de Coimbra, Portugal, Europe 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies. 40 * 41 * from getnetent.c 1.1 (Coimbra) 93/06/02 42 */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <netinet/in.h> 47 #include <arpa/inet.h> 48 #include <arpa/nameser.h> 49 #include <netdb.h> 50 #include <resolv.h> 51 #include <stdio.h> 52 #include <string.h> 53 #include <stdarg.h> 54 #include <nsswitch.h> 55 #include "netdb_private.h" 56 57 void 58 _setnethtent(int f, struct netent_data *ned) 59 { 60 61 if (ned->netf == NULL) 62 ned->netf = fopen(_PATH_NETWORKS, "r"); 63 else 64 rewind(ned->netf); 65 ned->stayopen |= f; 66 } 67 68 void 69 _endnethtent(struct netent_data *ned) 70 { 71 72 if (ned->netf) { 73 fclose(ned->netf); 74 ned->netf = NULL; 75 } 76 ned->stayopen = 0; 77 } 78 79 static int 80 getnetent_p(struct netent *ne, struct netent_data *ned) 81 { 82 char *p, *bp, *ep; 83 char *cp, **q; 84 int len; 85 char line[BUFSIZ + 1]; 86 87 if (ned->netf == NULL && 88 (ned->netf = fopen(_PATH_NETWORKS, "r")) == NULL) 89 return (-1); 90 again: 91 p = fgets(line, sizeof line, ned->netf); 92 if (p == NULL) 93 return (-1); 94 if (*p == '#') 95 goto again; 96 cp = strpbrk(p, "#\n"); 97 if (cp != NULL) 98 *cp = '\0'; 99 bp = ned->netbuf; 100 ep = ned->netbuf + sizeof ned->netbuf; 101 ne->n_name = bp; 102 cp = strpbrk(p, " \t"); 103 if (cp == NULL) 104 goto again; 105 *cp++ = '\0'; 106 len = strlen(p) + 1; 107 if (ep - bp < len) { 108 RES_SET_H_ERRNO(__res_state(), NO_RECOVERY); 109 return (-1); 110 } 111 strlcpy(bp, p, ep - bp); 112 bp += len; 113 while (*cp == ' ' || *cp == '\t') 114 cp++; 115 p = strpbrk(cp, " \t"); 116 if (p != NULL) 117 *p++ = '\0'; 118 ne->n_net = inet_network(cp); 119 ne->n_addrtype = AF_INET; 120 q = ne->n_aliases = ned->net_aliases; 121 if (p != NULL) { 122 cp = p; 123 while (cp && *cp) { 124 if (*cp == ' ' || *cp == '\t') { 125 cp++; 126 continue; 127 } 128 if (q >= &ned->net_aliases[_MAXALIASES - 1]) 129 break; 130 p = strpbrk(cp, " \t"); 131 if (p != NULL) 132 *p++ = '\0'; 133 len = strlen(cp) + 1; 134 if (ep - bp < len) 135 break; 136 strlcpy(bp, cp, ep - bp); 137 *q++ = bp; 138 bp += len; 139 cp = p; 140 } 141 } 142 *q = NULL; 143 return (0); 144 } 145 146 int 147 getnetent_r(struct netent *nptr, char *buffer, size_t buflen, 148 struct netent **result, int *h_errnop) 149 { 150 struct netent_data *ned; 151 struct netent ne; 152 res_state statp; 153 154 statp = __res_state(); 155 if ((ned = __netent_data_init()) == NULL) { 156 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 157 *h_errnop = statp->res_h_errno; 158 return (-1); 159 } 160 if (getnetent_p(&ne, ned) != 0) 161 return (-1); 162 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) 163 return (-1); 164 *result = nptr; 165 return (0); 166 } 167 168 struct netent * 169 getnetent(void) 170 { 171 struct netdata *nd; 172 struct netent *rval; 173 int ret_h_errno; 174 175 if ((nd = __netdata_init()) == NULL) 176 return (NULL); 177 if (getnetent_r(&nd->net, nd->data, sizeof(nd->data), &rval, 178 &ret_h_errno) != 0) 179 return (NULL); 180 return (rval); 181 } 182 183 int 184 _ht_getnetbyname(void *rval, void *cb_data __unused, va_list ap) 185 { 186 const char *name; 187 char *buffer; 188 size_t buflen; 189 int *errnop, *h_errnop; 190 struct netent *nptr, ne; 191 struct netent_data *ned; 192 char **cp; 193 res_state statp; 194 int error; 195 196 name = va_arg(ap, const char *); 197 nptr = va_arg(ap, struct netent *); 198 buffer = va_arg(ap, char *); 199 buflen = va_arg(ap, size_t); 200 errnop = va_arg(ap, int *); 201 h_errnop = va_arg(ap, int *); 202 203 statp = __res_state(); 204 if ((ned = __netent_data_init()) == NULL) { 205 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 206 *h_errnop = statp->res_h_errno; 207 return (NS_UNAVAIL); 208 } 209 210 _setnethtent(ned->stayopen, ned); 211 while ((error = getnetent_p(&ne, ned)) == 0) { 212 if (strcasecmp(ne.n_name, name) == 0) 213 break; 214 for (cp = ne.n_aliases; *cp != NULL; cp++) 215 if (strcasecmp(*cp, name) == 0) 216 goto found; 217 } 218 found: 219 if (!ned->stayopen) 220 _endnethtent(ned); 221 if (error != 0) { 222 *h_errnop = statp->res_h_errno; 223 return (NS_NOTFOUND); 224 } 225 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) { 226 *h_errnop = statp->res_h_errno; 227 return (NS_NOTFOUND); 228 } 229 *((struct netent **)rval) = nptr; 230 return (NS_SUCCESS); 231 } 232 233 int 234 _ht_getnetbyaddr(void *rval, void *cb_data __unused, va_list ap) 235 { 236 uint32_t net; 237 int type; 238 char *buffer; 239 size_t buflen; 240 int *errnop, *h_errnop; 241 struct netent *nptr, ne; 242 struct netent_data *ned; 243 res_state statp; 244 int error; 245 246 net = va_arg(ap, uint32_t); 247 type = va_arg(ap, int); 248 nptr = va_arg(ap, struct netent *); 249 buffer = va_arg(ap, char *); 250 buflen = va_arg(ap, size_t); 251 errnop = va_arg(ap, int *); 252 h_errnop = va_arg(ap, int *); 253 254 statp = __res_state(); 255 if ((ned = __netent_data_init()) == NULL) { 256 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 257 *h_errnop = statp->res_h_errno; 258 return (NS_UNAVAIL); 259 } 260 261 _setnethtent(ned->stayopen, ned); 262 while ((error = getnetent_p(&ne, ned)) == 0) 263 if (ne.n_addrtype == type && ne.n_net == net) 264 break; 265 if (!ned->stayopen) 266 _endnethtent(ned); 267 if (error != 0) { 268 *h_errnop = statp->res_h_errno; 269 return (NS_NOTFOUND); 270 } 271 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) { 272 *h_errnop = statp->res_h_errno; 273 return (NS_NOTFOUND); 274 } 275 *((struct netent **)rval) = nptr; 276 return (NS_SUCCESS); 277 } 278