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/* MIT License
*
* Copyright (c) The c-ares project and its contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
/* This test program is meant to loop indefinitely performing a query for the
* same domain once per second. The purpose of this is to test the event loop
* configuration change detection. You can modify the system configuration
* and verify queries work or don't work as expected. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
# include <winsock2.h>
# include <windows.h>
#else
# include <unistd.h>
# include <signal.h>
# include <netinet/in.h>
# include <arpa/inet.h>
# include <netdb.h>
#endif
#include "ares.h"
static void ai_callback(void *arg, int status, int timeouts,
struct ares_addrinfo *result)
{
struct ares_addrinfo_node *node = NULL;
(void)timeouts;
if (status != ARES_SUCCESS) {
fprintf(stderr, "%s: %s\n", (char *)arg, ares_strerror(status));
return;
}
for (node = result->nodes; node != NULL; node = node->ai_next) {
char addr_buf[64] = "";
const void *ptr = NULL;
if (node->ai_family == AF_INET) {
const struct sockaddr_in *in_addr =
(const struct sockaddr_in *)((void *)node->ai_addr);
ptr = &in_addr->sin_addr;
} else if (node->ai_family == AF_INET6) {
const struct sockaddr_in6 *in_addr =
(const struct sockaddr_in6 *)((void *)node->ai_addr);
ptr = &in_addr->sin6_addr;
} else {
continue;
}
ares_inet_ntop(node->ai_family, ptr, addr_buf, sizeof(addr_buf));
printf("%-32s\t%s\n", result->name, addr_buf);
}
ares_freeaddrinfo(result);
}
static volatile ares_bool_t is_running = ARES_TRUE;
#ifdef _WIN32
static BOOL WINAPI ctrlc_handler(_In_ DWORD dwCtrlType)
{
switch (dwCtrlType) {
case CTRL_C_EVENT:
is_running = ARES_FALSE;
return TRUE;
default:
break;
}
return FALSE;
}
#else
static void ctrlc_handler(int sig)
{
switch (sig) {
case SIGINT:
is_running = ARES_FALSE;
break;
default:
break;
}
}
#endif
int main(int argc, char *argv[])
{
struct ares_options options;
int optmask = 0;
ares_channel_t *channel;
size_t count;
ares_status_t status;
#ifdef _WIN32
WORD wVersionRequested = MAKEWORD(2, 2);
WSADATA wsaData;
WSAStartup(wVersionRequested, &wsaData);
#endif
if (argc != 2) {
printf("Usage: %s domain\n", argv[0]);
return 1;
}
status = (ares_status_t)ares_library_init(ARES_LIB_INIT_ALL);
if (status != ARES_SUCCESS) {
fprintf(stderr, "ares_library_init: %s\n", ares_strerror((int)status));
return 1;
}
memset(&options, 0, sizeof(options));
optmask |= ARES_OPT_EVENT_THREAD;
options.evsys = ARES_EVSYS_DEFAULT;
optmask |= ARES_OPT_QUERY_CACHE;
options.qcache_max_ttl = 0;
status = (ares_status_t)ares_init_options(&channel, &options, optmask);
if (status != ARES_SUCCESS) {
fprintf(stderr, "ares_init: %s\n", ares_strerror((int)status));
return 1;
}
#ifdef _WIN32
SetConsoleCtrlHandler(ctrlc_handler, TRUE);
#else
signal(SIGINT, ctrlc_handler);
#endif
printf("Querying for %s every 1s, press CTRL-C to quit...\n", argv[1]);
for (count = 1; is_running == ARES_TRUE; count++) {
struct ares_addrinfo_hints hints;
char *servers = ares_get_servers_csv(channel);
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
printf("Attempt %u using server list: %s ...\n", (unsigned int)count,
servers);
ares_free_string(servers);
ares_getaddrinfo(channel, argv[1], NULL, &hints, ai_callback, argv[1]);
#ifdef _WIN32
Sleep(1000);
#else
sleep(1);
#endif
}
printf("CTRL-C captured, cleaning up...\n");
ares_destroy(channel);
ares_library_cleanup();
#ifdef _WIN32
WSACleanup();
#endif
return 0;
}
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