How to Send from Server command propts and take output from client - c

Question

server.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(int argc, char *argv[]){
int portno;
int sockfd, ret;
struct sockaddr_in serverAddr;
int newSocket;
struct sockaddr_in newAddr;
socklen_t addr_size;
char buffer[1024];
pid_t childpid;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0){
printf("[-]Error in connection.\n");
exit(1);
}
printf("[+]Server Socket is created.\n");
portno = atoi(argv[1]);
memset(&serverAddr, '\0', sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(portno);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
ret = bind(sockfd, (struct sockaddr*)&serverAddr, sizeof(serverAddr));
if(ret < 0){
printf("[-]Error in binding.\n");
exit(1);
}
printf("[+]Bind to port %d\n", portno);
if(listen(sockfd, 10) == 0){
printf("[+]Listening....\n");
}else{
printf("[-]Error in binding.\n");
}
while(1){
newSocket = accept(sockfd, (struct sockaddr*)&newAddr, &addr_size);
if(newSocket < 0){
exit(1);
}
printf("[+]Bind to port %d\n", portno);
if(listen(sockfd, 10) == 0){
printf("[+]Listening....\n");
}else{
printf("[-]Error in binding.\n");
}
while(1){
newSocket = accept(sockfd, (struct sockaddr*)&newAddr, &addr_size);
if(newSocket < 0){
exit(1);
}
printf("Connection accepted from %s:%d\n", inet_ntoa(newAddr.sin_addr), ntohs(newAddr.sin_port));
if((childpid = fork()) == 0){
close(sockfd);
while(1){
recv(newSocket, buffer, 1024, 0);
if(strcmp(buffer, "END") == 0){
printf("Disconnected from %s:%d\n", inet_ntoa(newAddr.sin_addr), ntohs(newAddr.sin_port));
break;
}else{
printf("Client: %s\n", buffer);
send(newSocket, buffer, strlen(buffer), 0);
bzero(buffer, sizeof(buffer));
}
}
}
}
close(newSocket);
return 0;
}
}
Client.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(int argc, char *argv[]){
int portno;
int clientSocket, ret;
struct sockaddr_in serverAddr;
char buffer[1024];
clientSocket = socket(AF_INET, SOCK_STREAM, 0);
if(clientSocket < 0){
printf("[-]Error in connection.\n");
exit(1);
}
printf("[+]Client Socket is created.\n");
portno = atoi(argv[2]);
memset(&serverAddr, '\0', sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(portno);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
ret = connect(clientSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr));
if(ret < 0){
printf("[-]Error in connection.\n");
exit(1);
}
printf("[+]Connected to Server.\n");
while(1){
printf("Client: \t");
scanf("%s", &buffer[0]);
send(clientSocket, buffer, strlen(buffer), 0);
if(strcmp(buffer, "END") == 0){
close(clientSocket);
printf("[-]Disconnected from server.\n");
exit(1);
}
if(recv(clientSocket, buffer, 1024, 0) < 0){
printf("[-]Error in receiving data.\n");
}else{
printf("Server: \t%s\n", buffer);
}
}
return 0;
}
And i want each time i run server and client, when i run command ls from server take the output from client and other commands too like ls-l and ls -l | wc and ls > result.txt
I try running many examples i found but nothing just running command from server and take the same output to my client