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  * 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 }