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program12.c
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program12.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
int main()
{
int client_sock;
struct sockaddr_in server_addr;
int buffer[2], result;
ssize_t sent_bytes, recv_bytes;
// Create socket
client_sock = socket(AF_INET, SOCK_STREAM, 0);
if (client_sock < 0)
{
perror("[-]Socket error");
exit(EXIT_FAILURE);
}
printf("[+]Client socket created.\n");
// Configure settings
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(7799);
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
// Connect to server
if (connect(client_sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
perror("[-]Connect error");
close(client_sock);
exit(EXIT_FAILURE);
}
printf("[+]Connected to server.\n");
// Send data
buffer[0] = 10; // a
buffer[1] = 20; // b
sent_bytes = send(client_sock, buffer, sizeof(buffer), 0);
if (sent_bytes < 0)
{
perror("[-]Send error");
close(client_sock);
exit(EXIT_FAILURE);
}
printf("[+]Data sent.\n");
// Receive result
recv_bytes = recv(client_sock, &result, sizeof(result), 0);
if (recv_bytes < 0)
{
perror("[-]Receive error");
close(client_sock);
exit(EXIT_FAILURE);
}
else if (recv_bytes == 0)
{
printf("[-]Server closed the connection unexpectedly.\n");
close(client_sock);
exit(EXIT_FAILURE);
}
printf("[+]Result received: %d\n", result);
// Close the socket
close(client_sock);
printf("[+]Connection closed.\n");
return 0;
}