/*
** clienteph.c
**      Writen by Wei YIN, 20 August 2009.
**      **
**      Compile with "gcc -o clienteph clienteph.c"
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h> 
#include <unistd.h>
#include <netdb.h>
#include <string.h>

int main(int argc, char* argv[]) {
    int fd;
    struct in_addr* ipAddress;
    struct hostent* hostp;
    struct sockaddr_in socketAddr;
    char buffer[1024];
    int numBytes;
    int port;

    if(argc != 2) {
        fprintf(stderr, "usage: %s %s\n", argv[0], "server_port");
        return -1;
    }
    port = atoi(argv[1]);
    if(port < 1024|| port > 65535) {
	fprintf(stderr, "Invalid port number: %s\n", argv[1]);
	exit(1);
    }
    hostp = gethostbyname("moss");// provide hostname 
    ipAddress = (struct in_addr*)hostp->h_addr_list[0];//replace it with Server's ipAddress acquired from  Name Server 

    
    socketAddr.sin_family = AF_INET;	
    socketAddr.sin_port = htons(port);	/* Port number in network byte order, replace it by server's port number acquired from Name Server */
    socketAddr.sin_addr.s_addr = ipAddress->s_addr;
	printf("ip address is %s%\n",inet_ntoa(socketAddr.sin_addr));
    
    fd = socket(AF_INET, SOCK_STREAM, 0);

    
    if(connect(fd, (struct sockaddr*)&socketAddr, sizeof(socketAddr))==0)
	printf("connect to server OK\n");
    else
	printf("connect error\n");


    while(fgets(buffer, 1024, stdin)) {
	write(fd, buffer, strlen(buffer));
	
	numBytes = read(fd, buffer, 1023);
	
	buffer[numBytes] = '\0';
	
	printf("%s", buffer);
	fflush(stdout);
    }
    close(fd);
    return 0;
}