lib/ip/getnetent.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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include <sys/types.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <net/gen/in.h>
  42 #include <net/gen/netdb.h>
  43 #include <net/gen/inet.h>
  44 #include <net/gen/socket.h>
  45
  46 #define MAXALIASES      35
  47
  48 static FILE *netf;
  49 static char line[BUFSIZ+1];
  50 static struct netent net;
  51 static char *net_aliases[MAXALIASES];
  52 int _net_stayopen;
  53
  54 void
  55 setnetent(f)
  56         int f;
  57 {
  58         if (netf == NULL)
  59                 netf = fopen(_PATH_NETWORKS, "r" );
  60         else
  61                 rewind(netf);
  62         _net_stayopen |= f;
  63 }
  64
  65 void
  66 endnetent()
  67 {
  68         if (netf) {
  69                 fclose(netf);
  70                 netf = NULL;
  71         }
  72         _net_stayopen = 0;
  73 }
  74
  75 struct netent *
  76 getnetent()
  77 {
  78         char *p;
  79         register char *cp, **q;
  80
  81         if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "r" )) == NULL)
  82                 return (NULL);
  83 again:
  84         p = fgets(line, BUFSIZ, netf);
  85         if (p == NULL)
  86                 return (NULL);
  87         if (*p == '#')
  88                 goto again;
  89         cp = strpbrk(p, "#\n");
  90         if (cp == NULL)
  91                 goto again;
  92         *cp = '\0';
  93         net.n_name = p;
  94         cp = strpbrk(p, " \t");
  95         if (cp == NULL)
  96                 goto again;
  97         *cp++ = '\0';
  98         while (*cp == ' ' || *cp == '\t')
  99                 cp++;
 100         p = strpbrk(cp, " \t");
 101         if (p != NULL)
 102                 *p++ = '\0';
 103         net.n_net = inet_network(cp);
 104         net.n_addrtype = AF_INET;
 105         q = net.n_aliases = net_aliases;
 106         if (p != NULL)
 107                 cp = p;
 108         while (cp && *cp) {
 109                 if (*cp == ' ' || *cp == '\t') {
 110                         cp++;
 111                         continue;
 112                 }
 113                 if (q < &net_aliases[MAXALIASES - 1])
 114                         *q++ = cp;
 115                 cp = strpbrk(cp, " \t");
 116                 if (cp != NULL)
 117                         *cp++ = '\0';
 118         }
 119         *q = NULL;
 120         return (&net);
 121 }