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 * 4. 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 * $DragonFly: src/lib/libc/net/getnetbyht.c,v 1.5 2005/11/13 02:04:47 swildner Exp $ 33 */ 34 35 /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro 36 * Dep. Matematica Universidade de Coimbra, Portugal, Europe 37 * 38 * Permission to use, copy, modify, and distribute this software for any 39 * purpose with or without fee is hereby granted, provided that the above 40 * copyright notice and this permission notice appear in all copies. 41 * 42 * from getnetent.c 1.1 (Coimbra) 93/06/02 43 */ 44 45 #include <sys/types.h> 46 #include <sys/socket.h> 47 #include <netinet/in.h> 48 #include <arpa/inet.h> 49 #include <arpa/nameser.h> 50 #include <netdb.h> 51 #include <resolv.h> 52 #include <stdio.h> 53 #include <string.h> 54 #include <stdarg.h> 55 #include <nsswitch.h> 56 #include "netdb_private.h" 57 58 void 59 _setnethtent(int f, struct netent_data *ned) 60 { 61 62 if (ned->netf == NULL) 63 ned->netf = fopen(_PATH_NETWORKS, "r"); 64 else 65 rewind(ned->netf); 66 ned->stayopen |= f; 67 } 68 69 void 70 _endnethtent(struct netent_data *ned) 71 { 72 73 if (ned->netf) { 74 fclose(ned->netf); 75 ned->netf = NULL; 76 } 77 ned->stayopen = 0; 78 } 79 80 static int 81 getnetent_p(struct netent *ne, struct netent_data *ned) 82 { 83 char *p, *bp, *ep; 84 char *cp, **q; 85 int len; 86 char line[BUFSIZ + 1]; 87 88 if (ned->netf == NULL && 89 (ned->netf = fopen(_PATH_NETWORKS, "r")) == NULL) 90 return (-1); 91 again: 92 p = fgets(line, sizeof line, ned->netf); 93 if (p == NULL) 94 return (-1); 95 if (*p == '#') 96 goto again; 97 cp = strpbrk(p, "#\n"); 98 if (cp != NULL) 99 *cp = '\0'; 100 bp = ned->netbuf; 101 ep = ned->netbuf + sizeof ned->netbuf; 102 ne->n_name = bp; 103 cp = strpbrk(p, " \t"); 104 if (cp == NULL) 105 goto again; 106 *cp++ = '\0'; 107 len = strlen(p) + 1; 108 if (ep - bp < len) { 109 RES_SET_H_ERRNO(__res_state(), NO_RECOVERY); 110 return (-1); 111 } 112 strlcpy(bp, p, ep - bp); 113 bp += len; 114 while (*cp == ' ' || *cp == '\t') 115 cp++; 116 p = strpbrk(cp, " \t"); 117 if (p != NULL) 118 *p++ = '\0'; 119 ne->n_net = inet_network(cp); 120 ne->n_addrtype = AF_INET; 121 q = ne->n_aliases = ned->net_aliases; 122 if (p != NULL) { 123 cp = p; 124 while (cp && *cp) { 125 if (*cp == ' ' || *cp == '\t') { 126 cp++; 127 continue; 128 } 129 if (q >= &ned->net_aliases[_MAXALIASES - 1]) 130 break; 131 p = strpbrk(cp, " \t"); 132 if (p != NULL) 133 *p++ = '\0'; 134 len = strlen(cp) + 1; 135 if (ep - bp < len) 136 break; 137 strlcpy(bp, cp, ep - bp); 138 *q++ = bp; 139 bp += len; 140 cp = p; 141 } 142 } 143 *q = NULL; 144 return (0); 145 } 146 147 int 148 getnetent_r(struct netent *nptr, char *buffer, size_t buflen, 149 struct netent **result, int *h_errnop) 150 { 151 struct netent_data *ned; 152 struct netent ne; 153 res_state statp; 154 155 statp = __res_state(); 156 if ((ned = __netent_data_init()) == NULL) { 157 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 158 *h_errnop = statp->res_h_errno; 159 return (-1); 160 } 161 if (getnetent_p(&ne, ned) != 0) 162 return (-1); 163 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) 164 return (-1); 165 *result = nptr; 166 return (0); 167 } 168 169 struct netent * 170 getnetent(void) 171 { 172 struct netdata *nd; 173 struct netent *rval; 174 int ret_h_errno; 175 176 if ((nd = __netdata_init()) == NULL) 177 return (NULL); 178 if (getnetent_r(&nd->net, nd->data, sizeof(nd->data), &rval, 179 &ret_h_errno) != 0) 180 return (NULL); 181 return (rval); 182 } 183 184 int 185 _ht_getnetbyname(void *rval, void *cb_data, va_list ap) 186 { 187 const char *name; 188 char *buffer; 189 size_t buflen; 190 int *errnop, *h_errnop; 191 struct netent *nptr, ne; 192 struct netent_data *ned; 193 char **cp; 194 res_state statp; 195 int error; 196 197 name = va_arg(ap, const char *); 198 nptr = va_arg(ap, struct netent *); 199 buffer = va_arg(ap, char *); 200 buflen = va_arg(ap, size_t); 201 errnop = va_arg(ap, int *); 202 h_errnop = va_arg(ap, int *); 203 204 statp = __res_state(); 205 if ((ned = __netent_data_init()) == NULL) { 206 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 207 *h_errnop = statp->res_h_errno; 208 return (NS_UNAVAIL); 209 } 210 211 _setnethtent(ned->stayopen, ned); 212 while ((error = getnetent_p(&ne, ned)) == 0) { 213 if (strcasecmp(ne.n_name, name) == 0) 214 break; 215 for (cp = ne.n_aliases; *cp != 0; cp++) 216 if (strcasecmp(*cp, name) == 0) 217 goto found; 218 } 219 found: 220 if (!ned->stayopen) 221 _endnethtent(ned); 222 if (error != 0) { 223 *h_errnop = statp->res_h_errno; 224 return (NS_NOTFOUND); 225 } 226 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) { 227 *h_errnop = statp->res_h_errno; 228 return (NS_NOTFOUND); 229 } 230 *((struct netent **)rval) = nptr; 231 return (NS_SUCCESS); 232 } 233 234 int 235 _ht_getnetbyaddr(void *rval, void *cb_data, va_list ap) 236 { 237 uint32_t net; 238 int type; 239 char *buffer; 240 size_t buflen; 241 int *errnop, *h_errnop; 242 struct netent *nptr, ne; 243 struct netent_data *ned; 244 res_state statp; 245 int error; 246 247 net = va_arg(ap, uint32_t); 248 type = va_arg(ap, int); 249 nptr = va_arg(ap, struct netent *); 250 buffer = va_arg(ap, char *); 251 buflen = va_arg(ap, size_t); 252 errnop = va_arg(ap, int *); 253 h_errnop = va_arg(ap, int *); 254 255 statp = __res_state(); 256 if ((ned = __netent_data_init()) == NULL) { 257 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 258 *h_errnop = statp->res_h_errno; 259 return (NS_UNAVAIL); 260 } 261 262 _setnethtent(ned->stayopen, ned); 263 while ((error = getnetent_p(&ne, ned)) == 0) 264 if (ne.n_addrtype == type && ne.n_net == net) 265 break; 266 if (!ned->stayopen) 267 _endnethtent(ned); 268 if (error != 0) { 269 *h_errnop = statp->res_h_errno; 270 return (NS_NOTFOUND); 271 } 272 if (__copy_netent(&ne, nptr, buffer, buflen) != 0) { 273 *h_errnop = statp->res_h_errno; 274 return (NS_NOTFOUND); 275 } 276 *((struct netent **)rval) = nptr; 277 return (NS_SUCCESS); 278 } 279