lib/libc/net/getnetbyht.c

   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 __unused;
 190         int *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 != NULL; 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 __unused, va_list ap)
 236 {
 237         uint32_t net;
 238         int type;
 239         char *buffer;
 240         size_t buflen;
 241         int *errnop __unused;
 242         int *h_errnop;
 243         struct netent *nptr, ne;
 244         struct netent_data *ned;
 245         res_state statp;
 246         int error;
 247
 248         net = va_arg(ap, uint32_t);
 249         type = va_arg(ap, int);
 250         nptr = va_arg(ap, struct netent *);
 251         buffer = va_arg(ap, char *);
 252         buflen = va_arg(ap, size_t);
 253         errnop = va_arg(ap, int *);
 254         h_errnop = va_arg(ap, int *);
 255
 256         statp = __res_state();
 257         if ((ned = __netent_data_init()) == NULL) {
 258                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 259                 *h_errnop = statp->res_h_errno;
 260                 return (NS_UNAVAIL);
 261         }
 262
 263         _setnethtent(ned->stayopen, ned);
 264         while ((error = getnetent_p(&ne, ned)) == 0)
 265                 if (ne.n_addrtype == type && ne.n_net == net)
 266                         break;
 267         if (!ned->stayopen)
 268                 _endnethtent(ned);
 269         if (error != 0) {
 270                 *h_errnop = statp->res_h_errno;
 271                 return (NS_NOTFOUND);
 272         }
 273         if (__copy_netent(&ne, nptr, buffer, buflen) != 0) {
 274                 *h_errnop = statp->res_h_errno;
 275                 return (NS_NOTFOUND);
 276         }
 277         *((struct netent **)rval) = nptr;
 278         return (NS_SUCCESS);
 279 }