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103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/*
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* Portions created by SGI are Copyright (C) 2000 Silicon Graphics, Inc.
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* All Rights Reserved.
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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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*
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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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* 3. Neither the name of Silicon Graphics, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/types.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 "st.h"
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#if !defined(NETDB_INTERNAL) && defined(h_NETDB_INTERNAL)
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#define NETDB_INTERNAL h_NETDB_INTERNAL
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#endif
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/* Resolution timeout (in microseconds) */
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#define TIMEOUT (2*1000000LL)
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/* External function defined in the res.c file */
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int dns_getaddr(const char *host, struct in_addr *addr, st_utime_t timeout);
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void *do_resolve(void *host)
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{
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struct in_addr addr;
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/* Use dns_getaddr() instead of gethostbyname(3) to get IP address */
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if (dns_getaddr(host, &addr, TIMEOUT) < 0) {
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fprintf(stderr, "dns_getaddr: can't resolve %s: ", (char *)host);
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if (h_errno == NETDB_INTERNAL)
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perror("");
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else
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herror("");
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} else
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printf("%-40s %s\n", (char *)host, inet_ntoa(addr));
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return NULL;
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}
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/*
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* Asynchronous DNS host name resolution. This program creates one
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* ST thread for each host name (specified as command line arguments).
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* All threads do host name resolution concurrently.
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*/
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int main(int argc, char *argv[])
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{
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int i;
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if (argc < 2) {
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fprintf(stderr, "Usage: %s <hostname1> [<hostname2>] ...\n", argv[0]);
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exit(1);
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}
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if (st_init() < 0) {
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perror("st_init");
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exit(1);
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}
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for (i = 1; i < argc; i++) {
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/* Create a separate thread for each host name */
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if (st_thread_create(do_resolve, argv[i], 0, 0) == NULL) {
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perror("st_thread_create");
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exit(1);
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}
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}
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st_thread_exit(NULL);
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/* NOTREACHED */
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return 1;
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}
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