//
//   IPv6/v4 Client sample (checked on Win32/FreeBSD/MacOS X)
//

#include <stdio.h>
#include <memory.h>
#ifdef _WIN32
#	include <winsock2.h>
#	include <WS2TCPIP.h>
	const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
	const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
#else
#	include <unistd.h>
#	include <netdb.h>
#	include <sys/socket.h>
#	include <netinet/in.h>
#	define closesocket close
#	define INVALID_SOCKET -1
#endif

int main(int argc, char **argv ) {
	char *host = "localhost";
	char *port = "4913";
#ifdef _WIN32
	// Startup WinSock2
	WSADATA WSAData;
	WSAStartup(0x0202,&WSAData);
#endif
	addrinfo hints, *addr;

	memset(&hints, 0, sizeof(hints));
	hints.ai_family = AF_UNSPEC; // IPv6/v4
	hints.ai_socktype = SOCK_STREAM; // TCP
	int ret = getaddrinfo(host, port, &hints, &addr);

	int soc = INVALID_SOCKET;
	addrinfo *ai;
	for (ai = addr; ai != NULL; ai = ai->ai_next) {
		soc = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
		if (soc == INVALID_SOCKET) continue;
		if (connect(soc, ai->ai_addr, ai->ai_addrlen) == 0)
			break;
		closesocket(soc);
	}
	if (ai == NULL) {
		fprintf(stderr, "fail to connect.\n");
		freeaddrinfo(addr);
		return 1;
	}

	char remote[64];
	if (getnameinfo(ai->ai_addr, ai->ai_addrlen, remote,
			sizeof(remote), NULL, 0, NI_NUMERICHOST) )
		strcpy(remote, "<unknown>");
	printf("\nConnect for %s\n", remote);

	freeaddrinfo(addr);

	// recv message
	char msg[16];
	int len=recv(soc, msg, sizeof(msg)-1,0);
	msg[len]=0;
	printf("Recv data: %s\n",msg);

	shutdown(soc,2);
	closesocket(soc);

#ifdef _WIN32
	WSACleanup(); // Cleanup WinSock
#endif
	return 0;
}