Rewrite in C. Simple TCP listener.

.gitignore

@@ -1 +1,4 @@
+.idea/
 build/
+cmake-build-debug/
+cmake-build-release/

CMakeLists.txt

@@ -2,21 +2,19 @@ cmake_minimum_required(VERSION 3.15...4.0)
 
 project(SimpleHttpServer VERSION 1.0
                          DESCRIPTION "A simple HTTP server written in C++"
-                         LANGUAGES CXX)
+                         LANGUAGES C)
-
-
 
 add_library(
-  httpserverlib
+    httpserverlib
-  STATIC
+    STATIC
-  src/server.hpp
+    src/httpserver.h
-  src/server.cpp
+    src/httpserver.c
 )
-target_compile_features(httpserverlib PUBLIC cxx_std_23)
 
 add_executable(
-  httpserver
+    httpserver
-  app/main.cpp
+    app/main.c
+        app/main.h
 )
 
 target_link_libraries(httpserver PUBLIC httpserverlib)

app/main.c

@@ -0,0 +1,20 @@
+//
+// Created by nazar on 12.09.2025.
+//
+
+#include "main.h"
+#include <stdio.h>
+
+struct HttpResponse* handleRequest(struct HttpRequest* request)
+{
+    struct HttpResponse* http_response = {};
+    return http_response;
+}
+
+int main() {
+    struct HttpServer http_server;
+    printf("Starting the server...\n");
+    start_http_server(&http_server, ADDRESS, PORT);
+    printf("Bye!\n");
+    return 0;
+}

app/main.cpp

@@ -1,8 +0,0 @@
-#include <print>
-#include "../src/server.hpp"
-
-int main() {
-  SimpleHttpServer server;
-  server.start_listening(8080);
-  std::println("Bye!");
-}

app/main.h

@@ -0,0 +1,16 @@
+//
+// Created by nazar on 12.09.2025.
+//
+
+#ifndef SIMPLEHTTPSERVER_MAIN_H
+#define SIMPLEHTTPSERVER_MAIN_H
+
+#include "../src/httpserver.h"
+#define ADDRESS "127.0.0.1"
+#define PORT 8080
+
+struct HttpResponse* handleRequest(struct HttpRequest* request);
+
+int main();
+
+#endif //SIMPLEHTTPSERVER_MAIN_H

src/httpserver.c

@@ -0,0 +1,66 @@
+//
+// Created by nazar on 12.09.2025.
+//
+
+#include "httpserver.h"
+#include <stdio.h>
+
+void start_http_server(struct HttpServer* http_server, const char *addr, const short port)
+{
+    const int server_fd = socket(AF_INET, SOCK_STREAM, 0);
+    if (server_fd == -1)
+    {
+        printf("Failed to create new socket.\n");
+        return;
+    }
+
+    struct sockaddr_in address;
+    address.sin_family = AF_INET;
+    address.sin_addr.s_addr = inet_addr(addr);
+    address.sin_port = htons(port);
+
+    const int bind_c = bind(server_fd, (struct sockaddr*)&address, sizeof(address));
+    if (bind_c == -1)
+    {
+        printf("Failed to bind address.\n");
+        return;
+    }
+
+    const int listen_c = listen(server_fd, 3);
+    if (listen_c == -1)
+    {
+        printf("Failed to begin listening.\n");
+        return;
+    }
+
+    printf("Server is listening on %s:%d...\n", addr, port);
+
+    size_t addr_len = sizeof(address);
+    process_conn(http_server, server_fd, (struct sockaddr*)&address, (socklen_t*)&addr_len);
+
+    close(server_fd);
+}
+
+void process_conn(struct HttpServer* http_server, const int server_fd, struct sockaddr* address, socklen_t* addr_len)
+{
+    const int socket_d = accept(server_fd, address, addr_len);
+    if (socket_d == -1)
+    {
+        printf("Failed to accept connection.\n");
+        return;
+    }
+
+    char buffer[1024] = {0};
+    const ssize_t bytes_read = read(socket_d, buffer, 1024);
+    printf("Client message (%ld):\n", bytes_read);
+    for (int i = 0; i < bytes_read; i++)
+    {
+        if (buffer[i] == '\r')
+            continue;
+        putchar(buffer[i]);
+    }
+    putchar('\n');
+    fflush(stdout);
+
+    close(socket_d);
+}

src/httpserver.h

@@ -0,0 +1,36 @@
+//
+// Created by nazar on 12.09.2025.
+//
+// https://datatracker.ietf.org/doc/html/rfc9112#name-message
+
+#ifndef SIMPLEHTTPSERVER_H
+#define SIMPLEHTTPSERVER_H
+
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+
+struct HttpRequest
+{
+
+};
+
+struct HttpResponse
+{
+
+};
+
+struct HttpServer
+{
+    struct HttpResponse* (*handleRequest)(struct HttpRequest* request);
+};
+
+void start_http_server(struct HttpServer* http_server, const char *addr, short port);
+void process_conn(struct HttpServer* http_server, int server_fd, struct sockaddr* address, socklen_t* addr_len);
+
+#endif //SIMPLEHTTPSERVER_H

src/server.cpp

@@ -1,34 +0,0 @@
-#include "server.hpp"
-
-SimpleHttpServer::SimpleHttpServer() {
-}
-
-SimpleHttpServer::~SimpleHttpServer() {
-}
-
-void SimpleHttpServer::start_listening(int port) {
-  std::println("Starting server on port {0}...", port);
-  
-  int serverSocket = socket(AF_INET, SOCK_STREAM, 0);
-
-  sockaddr_in serverAddress;
-  serverAddress.sin_family = AF_INET;
-  serverAddress.sin_port = htons(port);
-  serverAddress.sin_addr.s_addr = INADDR_ANY;
-
-  bind(serverSocket, (struct sockaddr*)&serverAddress, sizeof(serverAddress));
-
-  listen(serverSocket, 5);
-
-  std::println("Listening...");
-
-  int clientSocket = accept(serverSocket, nullptr, nullptr);
-
-  char buffer[1024] = {0};
-  recv(clientSocket, buffer, sizeof(buffer), 0);
-  std::println("Received: {0}", buffer);
-
-  std::println("Closing...");
-
-  close(serverSocket);
-}

src/server.hpp

@@ -1,25 +0,0 @@
-#include <stdio.h>
-#include <print>
-#include <netdb.h> 
-#include <netinet/in.h> 
-#include <stdlib.h> 
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-class SimpleHttpServer {
-public:
-  SimpleHttpServer();
-  SimpleHttpServer(SimpleHttpServer &&) = default;
-  SimpleHttpServer(const SimpleHttpServer &) = default;
-  SimpleHttpServer &operator=(SimpleHttpServer &&) = default;
-  SimpleHttpServer &operator=(const SimpleHttpServer &) = default;
-  ~SimpleHttpServer();
-
-  void start_listening(int port);
-
-private:
-  
-};
-