mirror of https://github.com/getdnsapi/getdns.git
110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
#include <assert.h>
|
|
#include <inttypes.h>
|
|
#include <stdio.h>
|
|
#include <getdns_libevent.h>
|
|
|
|
/* Set up the callback function, which will also do the processing of the results */
|
|
void callback(getdns_context *context,
|
|
getdns_callback_type_t callback_type,
|
|
getdns_dict *response,
|
|
void *userarg,
|
|
getdns_transaction_t transaction_id)
|
|
{
|
|
getdns_return_t r; /* Holder for all function returns */
|
|
uint32_t status;
|
|
getdns_bindata *address_data;
|
|
char *first = NULL, *second = NULL;
|
|
|
|
(void) context; /* unused parameter */
|
|
|
|
printf( "Callback for query \"%s\" with request ID %"PRIu64".\n"
|
|
, (char *)userarg, transaction_id );
|
|
|
|
switch(callback_type) {
|
|
case GETDNS_CALLBACK_CANCEL:
|
|
printf("Transaction with ID %"PRIu64" was cancelled.\n", transaction_id);
|
|
return;
|
|
case GETDNS_CALLBACK_TIMEOUT:
|
|
printf("Transaction with ID %"PRIu64" timed out.\n", transaction_id);
|
|
return;
|
|
case GETDNS_CALLBACK_ERROR:
|
|
printf("An error occurred for transaction ID %"PRIu64".\n", transaction_id);
|
|
return;
|
|
default: break;
|
|
}
|
|
assert( callback_type == GETDNS_CALLBACK_COMPLETE );
|
|
|
|
if ((r = getdns_dict_get_int(response, "status", &status)))
|
|
fprintf(stderr, "Could not get \"status\" from reponse");
|
|
|
|
else if (status != GETDNS_RESPSTATUS_GOOD)
|
|
fprintf(stderr, "The search had no results, and a return value of %"PRIu32".\n", status);
|
|
|
|
else if ((r = getdns_dict_get_bindata(response, "/just_address_answers/0/address_data", &address_data)))
|
|
fprintf(stderr, "Could not get first address");
|
|
|
|
else if (!(first = getdns_display_ip_address(address_data)))
|
|
fprintf(stderr, "Could not convert first address to string\n");
|
|
|
|
else if ((r = getdns_dict_get_bindata(response, "/just_address_answers/1/address_data", &address_data)))
|
|
fprintf(stderr, "Could not get second address");
|
|
|
|
else if (!(second = getdns_display_ip_address(address_data)))
|
|
fprintf(stderr, "Could not convert second address to string\n");
|
|
|
|
if (first) {
|
|
printf("The address is %s\n", first);
|
|
free(first);
|
|
}
|
|
if (second) {
|
|
printf("The address is %s\n", second);
|
|
free(second);
|
|
}
|
|
if (r) {
|
|
assert( r != GETDNS_RETURN_GOOD );
|
|
fprintf(stderr, ": %d\n", r);
|
|
}
|
|
getdns_dict_destroy(response);
|
|
}
|
|
|
|
int main()
|
|
{
|
|
getdns_return_t r; /* Holder for all function returns */
|
|
getdns_context *context = NULL;
|
|
struct event_base *event_base = NULL;
|
|
getdns_dict *extensions = NULL;
|
|
char *query_name = "www.example.com";
|
|
/* Could add things here to help identify this call */
|
|
char *userarg = query_name;
|
|
getdns_transaction_t transaction_id;
|
|
|
|
if ((r = getdns_context_create(&context, 1)))
|
|
fprintf(stderr, "Trying to create the context failed");
|
|
|
|
else if (!(event_base = event_base_new()))
|
|
fprintf(stderr, "Trying to create the event base failed.\n");
|
|
|
|
else if ((r = getdns_extension_set_libevent_base(context, event_base)))
|
|
fprintf(stderr, "Setting the event base failed");
|
|
|
|
else if ((r = getdns_address( context, query_name, extensions
|
|
, userarg, &transaction_id, callback)))
|
|
fprintf(stderr, "Error scheduling asynchronous request");
|
|
|
|
else {
|
|
printf("Request with transaction ID %"PRIu64" scheduled.\n", transaction_id);
|
|
if (event_base_dispatch(event_base) < 0)
|
|
fprintf(stderr, "Error dispatching events\n");
|
|
}
|
|
|
|
/* Clean up */
|
|
if (event_base)
|
|
event_base_free(event_base);
|
|
|
|
if (context)
|
|
getdns_context_destroy(context);
|
|
|
|
/* Assuming we get here, leave gracefully */
|
|
exit(EXIT_SUCCESS);
|
|
}
|