60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <string.h>
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#include <strings.h>
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#include <stdlib.h>
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#include <ctype.h>
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void
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dump_res (struct addrinfo *p_res)
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{
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struct addrinfo *iter = p_res;
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while (iter != 0)
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{
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struct sockaddr_in *addr1b;
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addr1b = (struct sockaddr_in *) iter->ai_addr;
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printf ("getaddrinfo returns: %s %d %d\n", inet_ntoa (addr1b->sin_addr),
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iter->ai_family, iter->ai_protocol);
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iter = iter->ai_next;
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}
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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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if (argc != 2)
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{
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printf ("Usage prog hostname\n");
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exit (7);
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}
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struct addrinfo hints, *res;
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int error, i;
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bzero (&hints, sizeof (hints));
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hints.ai_flags = AI_CANONNAME;
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hints.ai_family = AF_UNSPEC;
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for (i = 0; i < 2; i++)
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{
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printf ("======== ATTEMPT %d ===============\n", i);
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if ((error = getaddrinfo (argv[1], NULL, &hints, &res)))
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{
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perror ("getaddrinfo");
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exit (-1);
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}
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dump_res (res);
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freeaddrinfo (res);
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}
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/* not such a bad idea ;-) */
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return 0;
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}
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