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TCP Client.c

This C program implements a simple TCP client that connects to a server at a specified address and port. It allows the user to send strings to the server and receive echo replies until the user decides to exit. The program handles socket creation, connection, sending, and receiving data, and ensures proper cleanup by closing the socket before termination.

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Năng Trần Xuân
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28 views2 pages

TCP Client.c

This C program implements a simple TCP client that connects to a server at a specified address and port. It allows the user to send strings to the server and receive echo replies until the user decides to exit. The program handles socket creation, connection, sending, and receiving data, and ensures proper cleanup by closing the socket before termination.

Uploaded by

Năng Trần Xuân
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as TXT, PDF, TXT or read online on Scribd
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#include <stdio.

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

#define SERVER_ADDR "127.0.0.1"


#define SERVER_PORT 5550
#define BUFF_SIZE 8192

int main(){
int client_sock;
char buff[BUFF_SIZE];
struct sockaddr_in server_addr; /* server's address information */
int msg_len, bytes_sent, bytes_received;

//Step 1: Construct socket


client_sock = socket(AF_INET,SOCK_STREAM,0);

//Step 2: Specify server address


server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(SERVER_PORT);
server_addr.sin_addr.s_addr = inet_addr(SERVER_ADDR);

//Step 3: Request to connect server


if(connect(client_sock, (struct sockaddr*)&server_addr, sizeof(struct
sockaddr)) < 0){
printf("\nError!Can not connect to sever! Client exit imediately! ");
return 0;
}

//Step 4: Communicate with server


while(1){
//send message
printf("\nInsert string to send:");
memset(buff,'\0',(strlen(buff)+1));
fgets(buff, BUFF_SIZE, stdin);
msg_len = strlen(buff);
if (smsg_len == 0) break;

bytes_sent = send(client_sock, buff, msg_len, 0);


if(bytes_sent <= 0){
printf("\nConnection closed!\n");
break;
}

//receive echo reply


bytes_received = recv(client_sock, buff, BUFF_SIZE-1, 0);
if(bytes_received <= 0){
printf("\nError!Cannot receive data from sever!\n");
break;
}

buff[bytes_received] = '\0';
printf("Reply from server: %s", buff);
}

//Step 4: Close socket


close(client_sock);
return 0;
}

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