1994-05-27 05:00:24 +00:00
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/*-
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1994-09-25 02:12:49 +00:00
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* Copyright (c) 1994, Garrett Wollman
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1994-05-27 05:00:24 +00:00
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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1994-09-25 02:12:49 +00:00
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
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1994-05-27 05:00:24 +00:00
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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1997-02-22 15:12:41 +00:00
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static char sccsid[] = "@(#)$Id$";
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static char rcsid[] = "$Id$";
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1994-05-27 05:00:24 +00:00
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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1996-08-29 20:08:19 +00:00
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#include <arpa/nameser.h> /* XXX hack for _res */
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#include <resolv.h> /* XXX hack for _res */
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1994-05-27 05:00:24 +00:00
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1994-08-09 20:23:14 +00:00
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#define _PATH_HOSTCONF "/etc/host.conf"
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1995-05-30 05:51:47 +00:00
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enum service_type {
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1994-08-09 20:23:14 +00:00
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SERVICE_NONE = 0,
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SERVICE_BIND,
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SERVICE_HOSTS,
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SERVICE_NIS };
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#define SERVICE_MAX SERVICE_NIS
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static struct {
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const char *name;
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enum service_type type;
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} service_names[] = {
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{ "hosts", SERVICE_HOSTS },
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{ "/etc/hosts", SERVICE_HOSTS },
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{ "hosttable", SERVICE_HOSTS },
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{ "htable", SERVICE_HOSTS },
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{ "bind", SERVICE_BIND },
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{ "dns", SERVICE_BIND },
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{ "domain", SERVICE_BIND },
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{ "yp", SERVICE_NIS },
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{ "yellowpages", SERVICE_NIS },
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{ "nis", SERVICE_NIS },
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{ 0, SERVICE_NONE }
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};
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static enum service_type service_order[SERVICE_MAX + 1];
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static int service_done = 0;
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static enum service_type
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get_service_name(const char *name) {
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int i;
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for(i = 0; service_names[i].type != SERVICE_NONE; i++) {
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if(!strcasecmp(name, service_names[i].name)) {
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return service_names[i].type;
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}
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}
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return SERVICE_NONE;
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}
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static void
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init_services()
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{
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1995-03-24 15:38:54 +00:00
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char *cp, *p, buf[BUFSIZ];
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1994-08-09 20:23:14 +00:00
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register int cc = 0;
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FILE *fd;
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if ((fd = (FILE *)fopen(_PATH_HOSTCONF, "r")) == NULL) {
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/* make some assumptions */
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service_order[0] = SERVICE_BIND;
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service_order[1] = SERVICE_HOSTS;
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service_order[2] = SERVICE_NONE;
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} else {
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while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) {
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if(buf[0] == '#')
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continue;
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1995-03-24 15:38:54 +00:00
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p = buf;
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while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
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;
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if (cp == NULL)
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continue;
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1994-08-09 20:23:14 +00:00
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do {
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1995-03-24 15:38:54 +00:00
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if (isalpha(cp[0])) {
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service_order[cc] = get_service_name(cp);
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if(service_order[cc] != SERVICE_NONE)
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cc++;
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}
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while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
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;
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} while(cp != NULL && cc < SERVICE_MAX);
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1994-08-09 20:23:14 +00:00
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}
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service_order[cc] = SERVICE_NONE;
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fclose(fd);
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}
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service_done = 1;
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}
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struct hostent *
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gethostbyname(const char *name)
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1996-08-29 20:08:19 +00:00
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{
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struct hostent *hp;
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if (_res.options & RES_USE_INET6) { /* XXX */
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hp = gethostbyname2(name, AF_INET6); /* XXX */
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if (hp) /* XXX */
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return (hp); /* XXX */
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} /* XXX */
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return (gethostbyname2(name, AF_INET));
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}
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struct hostent *
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gethostbyname2(const char *name, int type)
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1994-08-09 20:23:14 +00:00
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{
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struct hostent *hp = 0;
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int nserv = 0;
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1994-09-25 02:12:49 +00:00
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if (!service_done)
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1994-08-09 20:23:14 +00:00
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init_services();
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1994-09-25 02:12:49 +00:00
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while (!hp) {
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switch (service_order[nserv]) {
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1994-08-09 20:23:14 +00:00
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case SERVICE_NONE:
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1994-09-25 02:12:49 +00:00
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return NULL;
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1994-08-09 20:23:14 +00:00
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case SERVICE_HOSTS:
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1996-08-29 20:08:19 +00:00
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hp = _gethostbyhtname(name, type);
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1994-08-09 20:23:14 +00:00
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break;
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case SERVICE_BIND:
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1996-08-29 20:08:19 +00:00
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hp = _gethostbydnsname(name, type);
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1994-08-09 20:23:14 +00:00
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break;
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case SERVICE_NIS:
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1996-08-29 20:08:19 +00:00
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hp = _gethostbynisname(name, type);
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1994-08-09 20:23:14 +00:00
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break;
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}
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nserv++;
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}
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return hp;
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}
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struct hostent *
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gethostbyaddr(const char *addr, int len, int type)
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{
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struct hostent *hp = 0;
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int nserv = 0;
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1994-09-25 02:12:49 +00:00
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if (!service_done)
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1994-08-09 22:44:12 +00:00
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init_services();
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1994-08-09 20:23:14 +00:00
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1994-09-25 02:12:49 +00:00
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while (!hp) {
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switch (service_order[nserv]) {
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1994-08-09 20:23:14 +00:00
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case SERVICE_NONE:
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return 0;
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case SERVICE_HOSTS:
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1994-09-25 02:12:49 +00:00
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hp = _gethostbyhtaddr(addr, len, type);
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1994-08-09 20:23:14 +00:00
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break;
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case SERVICE_BIND:
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1994-09-25 02:12:49 +00:00
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hp = _gethostbydnsaddr(addr, len, type);
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1994-08-09 20:23:14 +00:00
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break;
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case SERVICE_NIS:
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1994-09-25 02:12:49 +00:00
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hp = _gethostbynisaddr(addr, len, type);
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1994-08-09 20:23:14 +00:00
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break;
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}
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nserv++;
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}
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return hp;
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}
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1996-08-20 08:22:01 +00:00
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#ifdef _THREAD_SAFE
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struct hostent_data;
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/*
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* Temporary function (not thread safe)
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*/
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int gethostbyaddr_r(const char *addr, int len, int type,
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struct hostent *result, struct hostent_data *buffer)
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{
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struct hostent *hp = 0;
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int ret;
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if ((hp = gethostbyaddr(addr, len, type)) == NULL) {
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ret = -1;
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} else {
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memcpy(result, hp, sizeof(struct hostent));
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ret = 0;
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}
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return(ret);
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}
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#endif
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1994-09-25 02:12:49 +00:00
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void
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sethostent(stayopen)
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int stayopen;
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{
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_sethosthtent(stayopen);
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_sethostdnsent(stayopen);
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}
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void
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endhostent()
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{
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_endhosthtent();
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_endhostdnsent();
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}
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