lib/libc/net/getnetbynis.c

   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 }