mirror of https://github.com/getdnsapi/getdns.git
111 lines
3.6 KiB
C
111 lines
3.6 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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getdns_list *answer;
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size_t n_answers, i;
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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_list(response, "/replies_tree/0/answer", &answer)))
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fprintf(stderr, "Could not get \"answer\" section from first reply in the reponse");
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else if ((r = getdns_list_get_length(answer, &n_answers)))
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fprintf(stderr, "Could not get replies_tree\'s length");
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else for (i = 0; i < n_answers && r == GETDNS_RETURN_GOOD; i++) {
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getdns_dict *rr;
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getdns_bindata *dname;
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char *dname_str;
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if ((r = getdns_list_get_dict(answer, i, &rr)))
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fprintf(stderr, "Could not get rr %zu from answer section", i);
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else if (getdns_dict_get_bindata(rr, "/rdata/ptrdname", &dname))
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continue; /* Not a PTR */
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else if ((r = getdns_convert_dns_name_to_fqdn(dname, &dname_str)))
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fprintf(stderr, "Could not convert PTR dname to string");
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else {
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printf("The dname is %s\n", dname_str);
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free(dname_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_bindata address_type = { 4, (void *)"IPv4" };
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getdns_bindata address_data = { 4, (void *)"\x08\x08\x08\x08" };
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getdns_dict *address = NULL;
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getdns_dict *extensions = NULL;
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/* Could add things here to help identify this call */
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char *userarg = NULL;
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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 (!(address = getdns_dict_create()))
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fprintf(stderr, "Could not create address dict.\n");
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else if ((r = getdns_dict_set_bindata(address, "address_type", &address_type)))
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fprintf(stderr, "Could not set address_type in address dict.\n");
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else if ((r = getdns_dict_set_bindata(address, "address_data", &address_data)))
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fprintf(stderr, "Could not set address_data in address dict.\n");
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else if ((r = getdns_hostname( context, address, extensions
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, userarg, &transaction_id, callback)))
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fprintf(stderr, "Error scheduling asynchronous request");
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else if (event_base_dispatch(event_base) < 0)
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fprintf(stderr, "Error dispatching events\n");
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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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