#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

const unsigned short bind_port = 4500;

int do_ipv4_bind(char *ip, const unsigned short port) {
	struct sockaddr_in addr;
	int sock;
	int ret;
	
	memset(&addr, 0x00, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	inet_pton(AF_INET, ip, &(addr.sin_addr));
	
	ret = socket(PF_INET, SOCK_STREAM, 0);
	if(ret == -1) {
		return ret;
	} else {
		sock = ret;
	}
	ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr));
	if(ret == -1) {
		return ret;
	} else {
		return sock;
	}
}

int do_ipv6_bind(char *ip, const unsigned short port) {
	struct sockaddr_in6 addr;
	int sock;
	int ret;
	
	memset(&addr, 0x00, sizeof(addr));
	addr.sin6_family = AF_INET6;
	addr.sin6_port = htons(port);
	inet_pton(AF_INET6, ip, &(addr.sin6_addr));
	
	ret = socket(PF_INET6, SOCK_STREAM, 0);
	if(ret == -1) {
		return ret;
	} else {
		sock = ret;
	}

	ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr));
	if(ret == -1) {
		return ret;
	} else {
		return sock;
	}
}

int main(void) {
	int ipv4_sock = 0;
	int ipv6_sock = 0;
	ipv4_sock = do_ipv4_bind("127.0.0.1", bind_port);
	ipv6_sock = do_ipv6_bind("::1", bind_port);
	if(ipv4_sock < 0) {
		printf("ipv4 bind failed\n");
	} else {
		printf("ipv4 bind succeeded\n");
		close(ipv4_sock);
	}
	if(ipv6_sock < 0) {
		printf("ipv6 bind failed\n");
	} else {
		printf("ipv6 bind succeeded\n");
		close(ipv6_sock);
	}
	return 0;
}