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121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/* Copyright 1998 by the Massachusetts Institute of Technology.
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#include <sys/types.h>
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#ifdef WIN32
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#else
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#include <sys/time.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 <unistd.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "ares.h"
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#include "ares_dns.h"
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#ifndef INADDR_NONE
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#define INADDR_NONE 0xffffffff
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#endif
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static void callback(void *arg, int status, struct hostent *host);
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static void usage(void);
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int main(int argc, char **argv)
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{
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ares_channel channel;
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int status, nfds;
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fd_set read_fds, write_fds;
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struct timeval *tvp, tv;
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char *errmem;
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struct in_addr addr;
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#ifdef WIN32
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WORD wVersionRequested = MAKEWORD(1,1);
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WSADATA wsaData;
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WSAStartup(wVersionRequested, &wsaData);
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#endif
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if (argc == 0)
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usage();
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status = ares_init(&channel);
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if (status != ARES_SUCCESS)
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{
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fprintf(stderr, "ares_init: %s\n", ares_strerror(status));
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ares_free_errmem(errmem);
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return 1;
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}
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/* Initiate the queries, one per command-line argument. */
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for (argv++; *argv; argv++)
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{
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addr.s_addr = inet_addr(*argv);
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if (addr.s_addr == INADDR_NONE)
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ares_gethostbyname(channel, *argv, AF_INET, callback, *argv);
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else
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{
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ares_gethostbyaddr(channel, &addr, sizeof(addr), AF_INET, callback,
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*argv);
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}
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}
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/* Wait for all queries to complete. */
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while (1)
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{
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FD_ZERO(&read_fds);
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FD_ZERO(&write_fds);
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nfds = ares_fds(channel, &read_fds, &write_fds);
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if (nfds == 0)
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break;
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tvp = ares_timeout(channel, NULL, &tv);
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select(nfds, &read_fds, &write_fds, NULL, tvp);
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ares_process(channel, &read_fds, &write_fds);
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}
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ares_destroy(channel);
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return 0;
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}
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static void callback(void *arg, int status, struct hostent *host)
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{
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struct in_addr addr;
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char *mem, **p;
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if (status != ARES_SUCCESS)
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{
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fprintf(stderr, "%s: %s\n", (char *) arg, ares_strerror(status));
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ares_free_errmem(mem);
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return;
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}
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for (p = host->h_addr_list; *p; p++)
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{
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memcpy(&addr, *p, sizeof(struct in_addr));
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printf("%-32s\t%s\n", host->h_name, inet_ntoa(addr));
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}
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}
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static void usage(void)
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{
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fprintf(stderr, "usage: ahost {host|addr} ...\n");
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exit(1);
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}
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