155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#define TRUE 1
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#define HOST_IP "127.0.0.1" // IPV4 loopback address
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#define SERVER_PORT 8077 // Server port
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#define BUFFER_SIZE 8192 // Default size (64bytes) to (8Kbytes)
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#define MAX_CONNECTIONS 2 // Num max client connected simultaneously
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#define SOCKET_ERROR_CODE -1 // Socket create, Connection server, Receive buffer to server code error
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#define SYSTEM_EXIT_FAILED 1 // Operating System program error response
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#define SYSTEM_EXIT_SUCCESS 0 // Operating System program success response
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typedef struct sockaddr_in socket_address;
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char buffer[BUFFER_SIZE];
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int create_socket()
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{
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int server_socket;
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server_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if(server_socket == SOCKET_ERROR_CODE)
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{
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perror("Socket create failed!");
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exit(SYSTEM_EXIT_FAILED);
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}
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return server_socket;
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}
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socket_address config_server_address()
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{
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socket_address server_address;
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server_address.sin_family = AF_INET; // IPV4 ips family
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server_address.sin_port = htons(SERVER_PORT);
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server_address.sin_addr.s_addr = inet_addr(HOST_IP);
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return server_address;
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}
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void bind_server(int server_socket, socket_address server_address)
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{
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struct sockaddr *address = (struct sockaddr*)&server_address;
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int server_bind_response = bind(server_socket, address, sizeof(server_address));
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if(server_bind_response == SOCKET_ERROR_CODE)
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{
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perror("Bind server error");
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close(server_socket);
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exit(SYSTEM_EXIT_FAILED);
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}
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}
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int accept_connection(int client_socket, int server_socket, socket_address client_address, socklen_t client_addr_len)
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{
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struct sockaddr *address = (struct sockaddr*)&client_address;
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client_socket = accept(server_socket, address, &client_addr_len);
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if(client_socket == SYSTEM_EXIT_FAILED)
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{
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perror("Accept connection error!");
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exit(SYSTEM_EXIT_FAILED);
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}else{
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printf("Client connected: %s:%d\n", inet_ntoa(client_address.sin_addr), ntohs(client_address.sin_port));
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return client_socket;
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}
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}
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void send_buffer(int client_socket)
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{
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printf("Sending [PONG]\n");
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send(client_socket, buffer, strlen(buffer), 0);
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}
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void receive_buffer(int client_socket)
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{
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int bytes_read;
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printf("Receiving [PING]\n");
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while((bytes_read = recv(client_socket, buffer, sizeof(buffer), 0)) > 0)
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{
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buffer[bytes_read] = '\0';
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printf("Client message received successfully!\n");
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send_buffer(client_socket);
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}
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}
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void controlc_handler()
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{
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printf("\nProgram finished!\n");
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exit(SYSTEM_EXIT_SUCCESS);
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}
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void server_listen(int client_socket, int server_socket, socket_address client_address, socklen_t client_addr_len)
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{
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if (listen(server_socket, MAX_CONNECTIONS) == SOCKET_ERROR_CODE)
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{
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perror("Listening mode error");
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close(server_socket);
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exit(SYSTEM_EXIT_FAILED);
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}
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printf("Server TCP listening on port %d...\n", SERVER_PORT);
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if(signal(SIGINT, controlc_handler) == SIG_ERR)
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{
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perror("Signal create error!");
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exit(SYSTEM_EXIT_FAILED);
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}
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while(TRUE)
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{
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client_socket = accept_connection(client_socket, server_socket, client_address, client_addr_len);
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receive_buffer(client_socket);
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}
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}
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int main(void)
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{
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int server_socket, client_socket;
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server_socket = create_socket();
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socket_address server_address, client_address;
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socklen_t client_addr_len = sizeof(client_address);
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server_address = config_server_address();
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bind_server(server_socket, server_address);
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server_listen(client_socket, server_socket, client_address, client_addr_len);
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}
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