#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define SERVER_IP "192.168.7.8"
#define SRC_PORT 50550
#define DST_PORT 2500

#define xerror(str) do { perror(str); exit(1); } while (0)

int main(void) {
	struct sockaddr_in sa;
	int s;
	int t = 0;
	char buf[32];
	int ret, tmp;

	memset(&sa, 0, sizeof(sa));
	
	for (t = 1; t <= 1; t++) {
		switch (fork()) {
			case -1:
				xerror("fork");
				break;
			case 0:
				printf("client %d binding port...\n", getpid());

				s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
				if (!s)
					xerror("socket");

				sa.sin_family = AF_INET;
				sa.sin_addr.s_addr = htonl(INADDR_ANY);
				sa.sin_port = htons(SRC_PORT);

				tmp = 1;
				if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*)&tmp, sizeof(tmp)) != 0)
					xerror("setsockopt");

				if (bind(s, (struct sockaddr*)&sa, sizeof(sa)) != 0)
					xerror("bind");


				printf("client %d connecting...\n", getpid());

				sa.sin_family = AF_INET;
				sa.sin_addr.s_addr = inet_addr(SERVER_IP);
				sa.sin_port = htons(DST_PORT);

				if (connect(s, (struct sockaddr*)&sa, sizeof(sa)) != 0)
					xerror("connect");

				printf("client %d waiting in read()...\n", getpid());

				ret = read(s, buf, 32);
				printf("client %d read() returned %d\n", getpid(), ret);

				close(s);

				return 0;
		}

		wait(NULL);
	}

	return 0;
}