TCP_sodClient.c

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
int main(int argc,char **argv)
{
    int sockfd,n, i = 0;
    char sendline[100];
    char recvline[100];
    struct sockaddr_in servaddr;
 
    sockfd=socket(AF_INET,SOCK_STREAM,0);
    bzero(&servaddr,sizeof servaddr);
 
    servaddr.sin_family=AF_INET;
    servaddr.sin_port=htons(21090);
 
    inet_pton(AF_INET,"127.0.0.1",&(servaddr.sin_addr));
 
    connect(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr));
 
    while(1)
    {
        bzero( sendline, 100);
        bzero( recvline, 100);
        fgets(sendline,100,stdin); /*stdin = 0 , for standard input */
 
	while(i < strlen(sendline))
	{
		if(isalpha(sendline[i])){
			printf("no strings allowed!!go to hell......!@");
			exit(1);
		}
		i++;
	}
	
        write(sockfd,sendline,strlen(sendline)+1);
        read(sockfd,recvline,100);
        printf("%s",recvline);
    }
    return 0;
}