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/* $OpenBSD: getnetent.c,v 1.17 2015/01/16 18:20:14 millert 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.
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#define MAXALIASES 35
static FILE *netf;
static char line[BUFSIZ+1];
static struct netent net;
static char *net_aliases[MAXALIASES];
int _net_stayopen;
void
setnetent(int f)
{
if (netf == NULL)
netf = fopen(_PATH_NETWORKS, "re" );
else
rewind(netf);
_net_stayopen |= f;
}
void
endnetent(void)
{
if (netf) {
fclose(netf);
netf = NULL;
}
_net_stayopen = 0;
}
struct netent *
getnetent(void)
{
char *p, *cp, **q;
size_t len;
if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re" )) == NULL)
return (NULL);
again:
if ((p = fgetln(netf, &len)) == NULL)
return (NULL);
if (p[len-1] == '\n')
len--;
if (len >= sizeof(line) || len == 0)
goto again;
p = memcpy(line, p, len);
line[len] = '\0';
if (*p == '#')
goto again;
if ((cp = strchr(p, '#')) != NULL)
*cp = '\0';
net.n_name = p;
if (strlen(net.n_name) > HOST_NAME_MAX)
net.n_name[HOST_NAME_MAX] = '\0';
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;
cp = p;
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &net_aliases[MAXALIASES - 1]) {
*q++ = cp;
if (strlen(cp) > HOST_NAME_MAX)
cp[HOST_NAME_MAX] = '\0';
}
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
*q = NULL;
return (&net);
}
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