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/*-

 * Copyright (c) 1994, Garrett Wollman

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE 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.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char rcsid[] = "$Id: getnetnamadr.c,v 1.2 2001-09-27 12:01:53 chris Exp $";

#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <netdb.h>

#include <stdio.h>

#include <ctype.h>

#include <errno.h>

#include <string.h>

#ifndef _PATH_NETCONF

#define _PATH_NETCONF   "/etc/host.conf"

#endif

enum service_type {

  SERVICE_NONE = 0,

  SERVICE_BIND,

  SERVICE_TABLE,

  SERVICE_NIS };

#define SERVICE_MAX     SERVICE_NIS

static struct {

  const char *name;

  enum service_type type;

} service_names[] = {

  { "hosts", SERVICE_TABLE },

  { "/etc/hosts", SERVICE_TABLE },

  { "hosttable", SERVICE_TABLE },

  { "htable", SERVICE_TABLE },

  { "bind", SERVICE_BIND },

  { "dns", SERVICE_BIND },

  { "domain", SERVICE_BIND },

  { "yp", SERVICE_NIS },

  { "yellowpages", SERVICE_NIS },

  { "nis", SERVICE_NIS },

  { 0, SERVICE_NONE }

};

static enum service_type service_order[SERVICE_MAX + 1];

static int service_done = 0;

static enum service_type

get_service_name(const char *name) {

        int i;

        for(i = 0; service_names[i].type != SERVICE_NONE; i++) {

                if(!strcasecmp(name, service_names[i].name)) {

                        return service_names[i].type;

                }

        }

        return SERVICE_NONE;

}

static void

init_services()

{

        char *cp, *p, buf[BUFSIZ];

        register int cc = 0;

        FILE *fd;

        if ((fd = (FILE *)fopen(_PATH_NETCONF, "r")) == NULL) {

                                /* make some assumptions */

                service_order[0] = SERVICE_TABLE;

                service_order[1] = SERVICE_NONE;

        } else {

                while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) {

                        if(buf[0] == '#')

                                continue;

                        p = buf;

                        while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')

                                ;

                        if (cp == NULL)

                                continue;

                        do {

                                if (isalpha(cp[0])) {

                                        service_order[cc] = get_service_name(cp);

                                        if(service_order[cc] != SERVICE_NONE)

                                                cc++;

                                }

                                while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')

                                        ;

                        } while(cp != NULL && cc < SERVICE_MAX);

                }

                service_order[cc] = SERVICE_NONE;

                fclose(fd);

        }

        service_done = 1;

}

struct netent *

getnetbyname(const char *name)

{

        struct netent *hp = 0;

        int nserv = 0;

        if (!service_done)

                init_services();

        while (!hp) {

                switch (service_order[nserv]) {

                      case SERVICE_NONE:

                        return NULL;

                      case SERVICE_TABLE:

                        hp = _getnetbyhtname(name);

                        break;

                      case SERVICE_BIND:

                        hp = _getnetbydnsname(name);

                        break;

                      case SERVICE_NIS:

                        hp = _getnetbynisname(name);

                        break;

                }

                nserv++;

        }

        return hp;

}

struct netent *

getnetbyaddr(addr, af)

        u_long addr;

        int af;

{

        struct netent *hp = 0;

        int nserv = 0;

        if (!service_done)

                init_services();

        while (!hp) {

                switch (service_order[nserv]) {

                      case SERVICE_NONE:

                        return 0;

                      case SERVICE_TABLE:

                        hp = _getnetbyhtaddr(addr, af);

                        break;

                      case SERVICE_BIND:

                        hp = _getnetbydnsaddr(addr, af);

                        break;

                      case SERVICE_NIS:

                        hp = _getnetbynisaddr(addr, af);

                        break;

                }

                nserv++;

        }

        return hp;

}

void

setnetent(stayopen)

        int stayopen;

{

        _setnethtent(stayopen);

        _setnetdnsent(stayopen);

}

void

endnetent()

{

        _endnethtent();

        _endnetdnsent();

}