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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 sccsid[] = "@(#)$Id: gethostnamadr.c,v 1.2 2001-09-27 12:01:53 chris Exp $";

static char rcsid[] = "$Id: gethostnamadr.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>

#include <arpa/nameser.h>               /* XXX hack for _res */

#include <resolv.h>                     /* XXX hack for _res */

#define _PATH_HOSTCONF  "/etc/host.conf"

enum service_type {

  SERVICE_NONE = 0,

  SERVICE_BIND,

  SERVICE_HOSTS,

  SERVICE_NIS };

#define SERVICE_MAX     SERVICE_NIS

static struct {

  const char *name;

  enum service_type type;

} service_names[] = {

  { "hosts", SERVICE_HOSTS },

  { "/etc/hosts", SERVICE_HOSTS },

  { "hosttable", SERVICE_HOSTS },

  { "htable", SERVICE_HOSTS },

  { "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_HOSTCONF, "r")) == NULL) {

                                /* make some assumptions */

                service_order[0] = SERVICE_BIND;

                service_order[1] = SERVICE_HOSTS;

                service_order[2] = 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((int)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 hostent *

gethostbyname(const char *name)

{

        struct hostent *hp;

        if (_res.options & RES_USE_INET6) {             /* XXX */

                hp = gethostbyname2(name, AF_INET6);    /* XXX */

                if (hp)                                 /* XXX */

                        return (hp);                    /* XXX */

        }                                               /* XXX */

        return (gethostbyname2(name, AF_INET));

}

struct hostent *

gethostbyname2(const char *name, int type)

{

        struct hostent *hp = 0;

        int nserv = 0;

        if (!service_done)

                init_services();

        while (!hp) {

                switch (service_order[nserv]) {

                      case SERVICE_NONE:

                        return NULL;

                      case SERVICE_HOSTS:

                        hp = _gethostbyhtname(name, type);

                        break;

                      case SERVICE_BIND:

                        hp = _gethostbydnsname(name, type);

                        break;

                      case SERVICE_NIS:

                        hp = _gethostbynisname(name, type);

                        break;

                }

                nserv++;

        }

        return hp;

}

struct hostent *

gethostbyaddr(const char *addr, int len, int type)

{

        struct hostent *hp = 0;

        int nserv = 0;

        if (!service_done)

                init_services();

        while (!hp) {

                switch (service_order[nserv]) {

                      case SERVICE_NONE:

                        return 0;

                      case SERVICE_HOSTS:

                        hp = _gethostbyhtaddr(addr, len, type);

                        break;

                      case SERVICE_BIND:

                        hp = _gethostbydnsaddr(addr, len, type);

                        break;

                      case SERVICE_NIS:

                        hp = _gethostbynisaddr(addr, len, type);

                        break;

                }

                nserv++;

        }

        return hp;

}

#ifdef _THREAD_SAFE

struct hostent_data;

/*

 * Temporary function (not thread safe)

 */

int gethostbyaddr_r(const char *addr, int len, int type,

        struct hostent *result, struct hostent_data *buffer)

{

        struct hostent *hp;

        int ret;

        if ((hp = gethostbyaddr(addr, len, type)) == NULL) {

                ret = -1;

        } else {

                memcpy(result, hp, sizeof(struct hostent));

                ret = 0;

        }

        return(ret);

}

#endif

void

sethostent(stayopen)

        int stayopen;

{

        _sethosthtent(stayopen);

        _sethostdnsent(stayopen);

}

void

endhostent()

{

        _endhosthtent();

        _endhostdnsent();

}