initial import

[ICEs.git] / 199025 / gethostbyname.c

#define _GNU_SOURCE
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>

int main(int argc, char *argv[])
{
	const char *name = (argc > 1 ? argv[1] : "localhost");
	printf("looking up '%s'\n", name);

	struct hostent *hent = gethostbyname(name);
	if (!hent) {
		herror("gethostbyname() failed");
		return 1;
	}

	size_t i;
	printf("h_name = %s\n", hent->h_name);
	printf("h_aliases = { ");
	for (i = 0; hent->h_aliases[i]; ++i)
		printf("%s'%s'", (i ? ", " : ""), hent->h_aliases[i]);
	printf(" }\n");
	printf("h_addr_list = { ");
	for (i = 0; hent->h_addr_list[i]; ++i) {
		struct in_addr addr;
		memcpy(&addr, hent->h_addr_list[i], sizeof(addr));
		printf("%s'%s'", (i ? ", " : ""), inet_ntoa(addr));
	}
	printf(" }\n");

	return 0;
}