云計(jì)算服務(wù)
服務(wù)器租用
DDOS 防護(hù)
虛擬主機(jī)
域名服務(wù)
基礎(chǔ)設(shè)施
關(guān)于我們
要使用C語言編寫一個(gè)Web服務(wù)器，你需要了解HTTP協(xié)議、套接字編程以及多線程等技術(shù)，下面是一個(gè)簡單的C語言Web服務(wù)器的實(shí)現(xiàn)過程：
1、需要包含一些必要的頭文件：
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> #include <sys/socket.h> #include <netinet/in.h> #include <pthread.h>
2、定義常量和全局變量：
#define PORT 8080 #define BUFFER_SIZE 4096 #define MAX_CONNECTIONS 5 int server_fd, client_fd; struct sockaddr_in server_addr, client_addr; pthread_t thread_id; int client_count = 0;
3、創(chuàng)建套接字并綁定地址：
server_fd = socket(AF_INET, SOCK_STREAM, 0); memset(&server_addr, 0, sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = INADDR_ANY; server_addr.sin_port = htons(PORT); bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)); listen(server_fd, MAX_CONNECTIONS);
4、創(chuàng)建線程處理客戶端連接：
void *handle_client(void *arg) {
int client_socket = *((int *)arg);
char buffer[BUFFER_SIZE];
char oldPath[1024] = {0};
char newPath[1024] = {0};
ssize_t bytesRead;
char fileName[1024] = {0};
char fileType[1024] = {0};
char fullPath[1024] = {0};
char response[BUFFER_SIZE] = "HTTP/1.1 200 OKr
ContentType: text/htmlr
r
";
char errorResponse[BUFFER_SIZE] = "HTTP/1.1 404 Not Foundr
ContentType: text/htmlr
r
";
char defaultPage[] = "<!DOCTYPE html><html><head><title>Welcome</title></head><body><h1>Welcome to my web server!</h1></body></html>";
char indexPage[] = "<!DOCTYPE html><html><head><title>Index</title></head><body><h1>Index page</h1></body></html>";
char aboutPage[] = "<!DOCTYPE html><html><head><title>About</title></head><body><h1>About page</h1></body></html>";
char notFoundPage[] = "<!DOCTYPE html><html><head><title>Not Found</title></head><body><h1>404 Not Found</h1></body></html>";
sprintf(fullPath, "%s/%s", oldPath, fileName); // Full path of the requested file
if (access(fullPath, F_OK) == 0) { // File exists, serve it
bytesRead = read(client_socket, buffer, sizeof(buffer) 1); // Read request from client
if (strncmp(buffer, "GET", 3) == 0) { // If request is a GET request
sscanf(buffer, "GET %s HTTP/1.1", fileName); // Get requested file name from request line
if (strcmp(fileName, "/") == 0) { // If requested file is root directory index page
strcpy(response, indexPage); // Set response as index page HTML content
} else if (strcmp(fileName, "/about") == 0) { // If requested file is about page
strcpy(response, aboutPage); // Set response as about page HTML content
} else { // If requested file is other than root directory or about page, serve it as static file
if (strstr(fileName, ".")) { // If requested file has extension, set response as error response (404 Not Found) and send default page instead of requested file to avoid serving potentially harmful files with extensions like .php, .js, etc.
strcpy(response, errorResponse); // Set response as error response (404 Not Found) HTML content
send(client_socket, defaultPage, strlen(defaultPage), 0); // Send default page to client instead of requested file to avoid serving potentially harmful files with extensions like .php, .js, etc.
} else { // If requested file has no extension, set response as error response (404 Not Found) and send default page instead of requested file to avoid serving potentially harmful files with extensions like .php, .js, etc. and also to avoid serving directory listings which can reveal sensitive information about the server's files and directories structure and contents if directory listing is enabled on the server for some reason like by mistake or intentionally for testing purposes or something else.
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