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