/*      $NetBSD: getnetent.c,v 1.22 2020/06/05 11:16:15 nia Exp $       */

/*
* Copyright (c) 1983, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
*    Dep. Matematica Universidade de Coimbra, Portugal, Europe
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* from getnetent.c   1.1 (Coimbra) 93/06/02
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getnetent.c 8.1 (Berkeley) 6/4/93";
static char rcsid[] = "Id: getnetent.c,v 8.4 1997/06/01 20:34:37 vixie Exp ";
#else
__RCSID("$NetBSD: getnetent.c,v 1.22 2020/06/05 11:16:15 nia Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>

#ifdef __weak_alias
__weak_alias(endnetent,_endnetent)
__weak_alias(getnetent,_getnetent)
__weak_alias(setnetent,_setnetent)
#endif

#define MAXALIASES      35

static FILE *netf;
static char line[BUFSIZ+1];
static struct netent net;
static char *net_aliases[MAXALIASES];
int _net_stayopen;

static void __setnetent(int);
static void __endnetent(void);

void
setnetent(int stayopen)
{

       sethostent(stayopen);
       __setnetent(stayopen);
}

void
endnetent(void)
{

       endhostent();
       __endnetent();
}

static void
__setnetent(int f)
{

       if (netf == NULL)
               netf = fopen(_PATH_NETWORKS, "re");
       else
               rewind(netf);
       _net_stayopen |= f;
}

static void
__endnetent(void)
{

       if (netf) {
               fclose(netf);
               netf = NULL;
       }
       _net_stayopen = 0;
}

struct netent *
getnetent(void)
{
       char *p;
       register char *cp, **q;

       if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re")) == NULL)
               return (NULL);
#if (defined(__sparc__) && defined(_LP64)) ||           \
   defined(__alpha__)
       net.__n_pad0 = 0;
#endif
again:
       p = fgets(line, (int)sizeof line, netf);
       if (p == NULL)
               return (NULL);
       if (*p == '#')
               goto again;
       cp = strpbrk(p, "#\n");
       if (cp == NULL)
               goto again;
       *cp = '\0';
       net.n_name = p;
       cp = strpbrk(p, " \t");
       if (cp == NULL)
               goto again;
       *cp++ = '\0';
       while (*cp == ' ' || *cp == '\t')
               cp++;
       p = strpbrk(cp, " \t");
       if (p != NULL)
               *p++ = '\0';
       net.n_net = inet_network(cp);
       net.n_addrtype = AF_INET;
       q = net.n_aliases = net_aliases;
       if (p != NULL) {
               cp = p;
               while (cp && *cp) {
                       if (*cp == ' ' || *cp == '\t') {
                               cp++;
                               continue;
                       }
                       if (q < &net_aliases[MAXALIASES - 1])
                               *q++ = cp;
                       cp = strpbrk(cp, " \t");
                       if (cp != NULL)
                               *cp++ = '\0';
               }
       }
       *q = NULL;
       return (&net);
}