64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
#define _BSD_SOURCE
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netdb.h>
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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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#define SIZE 500
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/* Calls getaddrinfo thrice with argv[1]
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i.e. once each for AF_UNSPEC, AF_INET and AF_INET6
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*/
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void
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test (char *query, int af, char *af_name)
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{
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struct addrinfo *result, *current;
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struct addrinfo hints;
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int ecode;
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hints.ai_socktype = 0;
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hints.ai_protocol = 0;
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hints.ai_flags = AI_CANONNAME|AI_ADDRCONFIG;
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hints.ai_family = af;
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if (ecode = getaddrinfo (query, NULL, &hints, &result))
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{
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printf ("WARN: %s query failed with error: %s\n", af_name, gai_strerror(ecode));
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}
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else
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{
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printf ("INFO: %s results:\n", af_name);
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for (current = result; current != NULL && current->ai_canonname != NULL; current = current->ai_next)
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printf ("%s\n", current->ai_canonname);
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freeaddrinfo (result);
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}
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return;
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}
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int
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main (int argc, char **argv)
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{
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char *query;
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/* There must be an argument, which we assume is the FQDN. */
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if (argc < 2)
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return EXIT_FAILURE;
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/* Copy FQDN, and tokenize it into name. */
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query = argv[1];
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printf ("query=%s\n", query);
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test (query, AF_UNSPEC, "AF_UNSPEC");
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test (query, AF_INET, "AF_INET");
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test (query, AF_INET6, "AF_INET6");
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return EXIT_SUCCESS;
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}
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