Update server.c
feat: Major server enhancements and build system - Implemented file caching system with LRU eviction - Added thread pool for connection handling - Improved MIME type detection and security headers - Added rate limiting per IP address - Enhanced logging system with rotation - Added proper signal handling and graceful shutdown - Implemented SSL/TLS support with modern cipher suites - Added license (MIT) and disclaimer - Fixed CSS/JS MIME type issues - Optimized socket configuration - Added sendfile() optimization - Improved error handling and memory management Technical changes: - Set TCP_NODELAY and optimized socket buffers - Implemented epoll-based async I/O - Added file cache with 1MB max file size - Set 100MB max log file size with rotation - Added thread pool with 32 max threads - Implemented rate limiting (100 requests/60s) - Added proper MIME type detection - Fixed CSP headers for external resources - Added comprehensive input sanitization - Improved SSL context configuration - Added proper resource cleanup
This commit is contained in:
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582
server.c
582
server.c
@@ -15,6 +15,11 @@
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#include <libgen.h>
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#include <signal.h>
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#include <sys/epoll.h>
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#include <netinet/tcp.h>
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#include <magic.h>
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#include <ctype.h>
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#include <time.h>
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#include <sys/sendfile.h>
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#include "server_config.h"
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@@ -30,6 +35,66 @@
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#define BLUE "\x1b[34m"
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#define RESET "\x1b[0m"
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#define HANDLE_ERROR(msg) do { \
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log_event(msg ": " BOLD RED); \
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log_event(strerror(errno)); \
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goto cleanup; \
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} while(0)
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// Use larger buffer for file operations
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#define FILE_BUFFER_SIZE 65536
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#define SECURITY_HEADERS \
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"X-Content-Type-Options: nosniff\r\n" \
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"X-Frame-Options: SAMEORIGIN\r\n" \
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"X-XSS-Protection: 1; mode=block\r\n" \
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"Content-Security-Policy: default-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; " \
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"font-src 'self' https://fonts.gstatic.com; script-src 'self' 'unsafe-inline';\r\n"
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#define RATE_LIMIT_WINDOW 60 // 60 seconds
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#define MAX_REQUESTS 100 // max requests per window
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#define LOG_BUFFER_SIZE 4096
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#define MAX_LOG_FILE_SIZE (100 * 1024 * 1024) // 100MB max log file size
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#define SOCKET_SEND_BUFFER_SIZE (256 * 1024) // 256KB
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#define SOCKET_RECV_BUFFER_SIZE (256 * 1024) // 256KB
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#define SOCKET_BACKLOG 128 // Increased from 50
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#define EPOLL_TIMEOUT 100 // 100ms timeout
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#define MAX_THREAD_POOL_SIZE 32
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#define MAX_CACHE_SIZE 100
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#define MAX_CACHE_FILE_SIZE (1024 * 1024) // 1MB
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typedef struct {
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pthread_t thread;
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int busy;
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} ThreadInfo;
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ThreadInfo *thread_pool;
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int thread_pool_size = 0;
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pthread_mutex_t thread_pool_mutex = PTHREAD_MUTEX_INITIALIZER;
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pthread_cond_t thread_pool_cond = PTHREAD_COND_INITIALIZER;
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typedef struct {
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char ip[INET_ADDRSTRLEN];
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time_t window_start;
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int request_count;
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} RateLimit;
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typedef struct {
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char *path;
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char *data;
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size_t size;
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time_t last_access;
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char *mime_type;
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} CacheEntry;
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CacheEntry *file_cache = NULL;
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int cache_size = 0;
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pthread_mutex_t cache_mutex = PTHREAD_MUTEX_INITIALIZER;
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ServerConfig config;
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char server_log[MAX_LOG_SIZE];
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pthread_mutex_t log_mutex = PTHREAD_MUTEX_INITIALIZER;
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@@ -42,6 +107,10 @@ int http_socket = -1;
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int https_socket = -1;
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int epoll_fd;
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RateLimit *rate_limits = NULL;
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int rate_limit_count = 0;
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pthread_mutex_t rate_limit_mutex = PTHREAD_MUTEX_INITIALIZER;
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void *handle_http_client(void *arg);
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void *handle_https_client(void *arg);
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void log_event(const char *message);
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@@ -53,6 +122,9 @@ void *start_http_server(void *arg);
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void *start_https_server(void *arg);
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void shutdown_server();
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int parse_request_line(char *request_buffer, char *method, char *url, char *protocol);
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char* get_mime_type(const char *filepath);
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char* sanitize_url(const char *url);
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int check_rate_limit(const char *ip);
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void initialize_openssl() {
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if (!SSL_library_init()) {
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@@ -98,6 +170,31 @@ void configure_ssl_context(SSL_CTX *ctx) {
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}
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}
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void set_socket_options(int socket_fd) {
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int flags = fcntl(socket_fd, F_GETFL, 0);
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fcntl(socket_fd, F_SETFL, flags | O_NONBLOCK); // Make socket non-blocking
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int reuse = 1;
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int keepalive = 1;
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int keepidle = 60;
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int keepintvl = 10;
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int keepcnt = 5;
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int nodelay = 1;
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setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
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setsockopt(socket_fd, SOL_SOCKET, SO_REUSEPORT, &reuse, sizeof(reuse));
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setsockopt(socket_fd, SOL_SOCKET, SO_KEEPALIVE, &keepalive, sizeof(keepalive));
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setsockopt(socket_fd, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(nodelay));
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setsockopt(socket_fd, IPPROTO_TCP, TCP_KEEPIDLE, &keepidle, sizeof(keepidle));
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setsockopt(socket_fd, IPPROTO_TCP, TCP_KEEPINTVL, &keepintvl, sizeof(keepintvl));
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setsockopt(socket_fd, IPPROTO_TCP, TCP_KEEPCNT, &keepcnt, sizeof(keepcnt));
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int sendbuf = SOCKET_SEND_BUFFER_SIZE;
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int recvbuf = SOCKET_RECV_BUFFER_SIZE;
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setsockopt(socket_fd, SOL_SOCKET, SO_SNDBUF, &sendbuf, sizeof(sendbuf));
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setsockopt(socket_fd, SOL_SOCKET, SO_RCVBUF, &recvbuf, sizeof(recvbuf));
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}
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void *start_http_server(void *arg) {
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http_socket = socket(AF_INET, SOCK_STREAM, 0);
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if (http_socket < 0) {
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@@ -105,12 +202,7 @@ void *start_http_server(void *arg) {
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pthread_exit(NULL);
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}
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int reuse = 1;
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if (setsockopt(http_socket, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
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perror(BOLD RED "Error setting SO_REUSEADDR" RESET);
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close(http_socket);
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pthread_exit(NULL);
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}
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set_socket_options(http_socket);
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struct sockaddr_in http_address = {0};
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http_address.sin_family = AF_INET;
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@@ -123,7 +215,7 @@ void *start_http_server(void *arg) {
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pthread_exit(NULL);
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}
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if (listen(http_socket, 50) < 0) {
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if (listen(http_socket, SOCKET_BACKLOG) < 0) {
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perror(BOLD RED "Error listening on HTTP socket" RESET);
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close(http_socket);
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pthread_exit(NULL);
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@@ -150,7 +242,7 @@ void *start_http_server(void *arg) {
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struct epoll_event events[MAX_EVENTS];
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while (config.running && server_running) {
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int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, 100); // 100ms timeout
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int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, EPOLL_TIMEOUT); // 100ms timeout
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if (nfds == -1) {
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if (errno != EINTR) { // Ignore interrupts for shutdown
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perror("epoll_wait");
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@@ -208,6 +300,8 @@ void *start_https_server(void *arg) {
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pthread_exit(NULL);
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}
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set_socket_options(https_socket);
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struct sockaddr_in https_address;
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memset(&https_address, 0, sizeof(https_address));
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https_address.sin_family = AF_INET;
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@@ -220,7 +314,7 @@ void *start_https_server(void *arg) {
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pthread_exit(NULL);
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}
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if (listen(https_socket, 50) < 0) {
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if (listen(https_socket, SOCKET_BACKLOG) < 0) {
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perror(BOLD RED "Error listening on HTTPS socket" RESET);
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close(https_socket);
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pthread_exit(NULL);
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@@ -296,58 +390,81 @@ void *handle_http_client(void *arg) {
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return NULL;
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}
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if (strstr(url, "..") || strstr(url, "//")) {
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log_event("Blocked potential directory traversal attempt.");
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char *sanitized_url = sanitize_url(url);
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if (!sanitized_url) {
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log_event("Blocked malicious URL");
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const char *forbidden_response = "HTTP/1.1 403 Forbidden\r\n\r\nAccess Denied";
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send(client_socket, forbidden_response, strlen(forbidden_response), 0);
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return NULL;
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}
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char client_ip[INET_ADDRSTRLEN];
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struct sockaddr_in addr;
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socklen_t addr_len = sizeof(addr);
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getpeername(client_socket, (struct sockaddr *)&addr, &addr_len);
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inet_ntop(AF_INET, &addr.sin_addr, client_ip, sizeof(client_ip));
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if (!check_rate_limit(client_ip)) {
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log_event("Rate limit exceeded for IP:");
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log_event(client_ip);
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const char *rate_limit_response = "HTTP/1.1 429 Too Many Requests\r\n\r\nRate limit exceeded";
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send(client_socket, rate_limit_response, strlen(rate_limit_response), 0);
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close(client_socket);
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return NULL;
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}
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char filepath[512];
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snprintf(filepath, sizeof(filepath), "www%s", (*url == '/' && url[1] == '\0') ? "/index.html" : url);
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snprintf(filepath, sizeof(filepath), "www%s",
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(*sanitized_url == '/' && sanitized_url[1] == '\0') ? "/index.html" : sanitized_url);
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free(sanitized_url);
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// Get MIME type
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char *mime_type = get_mime_type(filepath);
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int fd = open(filepath, O_RDONLY);
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if (fd == -1) {
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const char *not_found_response = "HTTP/1.1 404 Not Found\r\n\r\nFile Not Found";
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send(client_socket, not_found_response, strlen(not_found_response), 0);
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free(mime_type);
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log_event("File not found, sent 404.");
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} else {
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struct stat st;
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if (fstat(fd, &st) == -1) {
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log_event("Error getting file size.");
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const char *internal_server_error = "HTTP/1.1 500 Internal Server Error\r\n\r\nInternal Server Error";
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const char *internal_server_error =
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"HTTP/1.1 500 Internal Server Error\r\n\r\nInternal Server Error";
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send(client_socket, internal_server_error, strlen(internal_server_error), 0);
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close(fd);
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free(mime_type);
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goto cleanup;
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}
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off_t file_size = st.st_size;
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char response_header[256];
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char response_header[512];
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snprintf(response_header, sizeof(response_header),
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"HTTP/1.1 200 OK\r\n"
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"Content-Length: %ld\r\n"
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"Content-Type: text/html\r\n"
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"Content-Type: %s\r\n"
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"%s"
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"\r\n",
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file_size);
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(long)st.st_size,
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mime_type,
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SECURITY_HEADERS);
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free(mime_type);
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send(client_socket, response_header, strlen(response_header), 0);
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char file_buffer[1024];
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ssize_t bytes_read;
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while ((bytes_read = read(fd, file_buffer, sizeof(file_buffer))) > 0) {
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if (send(client_socket, file_buffer, bytes_read, 0) < 0) {
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log_event("Error sending file content.");
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break;
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}
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off_t offset = 0;
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ssize_t sent = sendfile(client_socket, fd, &offset, st.st_size);
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if (sent != st.st_size) {
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log_event("Error sending file with sendfile()");
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}
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close(fd);
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log_event("Served requested file successfully.");
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}
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} else if (bytes_received < 0) {
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perror("Error receiving request");
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log_event("Error receiving request");
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HANDLE_ERROR("Error receiving request");
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}
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close(client_socket);
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@@ -421,45 +538,71 @@ void *handle_https_client(void *arg) {
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log_event(protocol);
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}
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if (strstr(url, "..") || strstr(url, "//")) {
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log_event("Blocked potential directory traversal attempt.");
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char *sanitized_url = sanitize_url(url);
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if (!sanitized_url) {
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log_event("Blocked malicious URL");
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const char *forbidden_response = "HTTP/1.1 403 Forbidden\r\n\r\nAccess Denied";
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SSL_write(ssl, forbidden_response, strlen(forbidden_response));
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goto cleanup;
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}
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char client_ip[INET_ADDRSTRLEN];
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struct sockaddr_in addr;
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socklen_t addr_len = sizeof(addr);
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getpeername(client_socket, (struct sockaddr *)&addr, &addr_len);
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inet_ntop(AF_INET, &addr.sin_addr, client_ip, sizeof(client_ip));
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if (!check_rate_limit(client_ip)) {
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log_event("Rate limit exceeded for IP:");
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log_event(client_ip);
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const char *rate_limit_response = "HTTP/1.1 429 Too Many Requests\r\n\r\nRate limit exceeded";
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SSL_write(ssl, rate_limit_response, strlen(rate_limit_response));
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goto cleanup;
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}
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char filepath[512];
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snprintf(filepath, sizeof(filepath), "www%s", (*url == '/' && url[1] == '\0') ? "/index.html" : url);
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snprintf(filepath, sizeof(filepath), "www%s",
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(*sanitized_url == '/' && sanitized_url[1] == '\0') ? "/index.html" : sanitized_url);
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free(sanitized_url);
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log_event("Filepath:");
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log_event(filepath);
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// Get MIME type
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char *mime_type = get_mime_type(filepath);
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int fd = open(filepath, O_RDONLY);
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if (fd == -1) {
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perror("open error");
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log_event("File open failed");
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const char *not_found_response = "HTTP/1.1 404 Not Found\r\n\r\nFile Not Found";
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SSL_write(ssl, not_found_response, strlen(not_found_response));
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free(mime_type);
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goto cleanup;
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} else {
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struct stat st;
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if (fstat(fd, &st) == -1) {
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perror("fstat error");
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log_event("Error getting file size.");
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const char *internal_server_error = "HTTP/1.1 500 Internal Server Error\r\n\r\nInternal Server Error";
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const char *internal_server_error =
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"HTTP/1.1 500 Internal Server Error\r\n\r\nInternal Server Error";
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SSL_write(ssl, internal_server_error, strlen(internal_server_error));
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close(fd);
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free(mime_type);
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goto cleanup;
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}
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off_t file_size = st.st_size;
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char response_header[256];
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char response_header[512];
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snprintf(response_header, sizeof(response_header),
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"HTTP/1.1 200 OK\r\n"
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"Content-Length: %ld\r\n"
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"Content-Type: text/html\r\n"
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"Content-Type: %s\r\n"
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"%s"
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"\r\n",
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file_size);
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(long)st.st_size,
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mime_type,
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SECURITY_HEADERS);
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free(mime_type);
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SSL_write(ssl, response_header, strlen(response_header));
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@@ -487,37 +630,69 @@ cleanup:
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void shutdown_server() {
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log_event("Shutting down server...");
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config.running = 0;
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server_running = 0;
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log_event("Initiating server shutdown...");
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// Set shutdown flags atomically
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__atomic_store_n(&server_running, 0, __ATOMIC_SEQ_CST);
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__atomic_store_n(&config.running, 0, __ATOMIC_SEQ_CST);
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// Close all sockets
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if (http_socket != -1) {
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epoll_ctl(epoll_fd, EPOLL_CTL_DEL, http_socket, NULL);
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shutdown(http_socket, SHUT_RDWR);
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close(http_socket);
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http_socket = -1;
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}
|
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if (config.use_https && https_socket != -1) {
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epoll_ctl(epoll_fd, EPOLL_CTL_DEL, https_socket, NULL);
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if (https_socket != -1) {
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shutdown(https_socket, SHUT_RDWR);
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close(https_socket);
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https_socket = -1;
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}
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if (epoll_fd != -1) {
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close(epoll_fd);
|
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epoll_fd = -1;
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}
|
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close(epoll_fd);
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// Wait for all threads with timeout
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struct timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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ts.tv_sec += 5; // 5 second timeout
|
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|
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pthread_mutex_lock(&thread_count_mutex);
|
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while (num_client_threads > 0 && clock_gettime(CLOCK_REALTIME, &ts) < 5) {
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pthread_cond_timedwait(&thread_pool_cond, &thread_count_mutex, &ts);
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}
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|
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// Force kill remaining threads
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for (int i = 0; i < num_client_threads; i++) {
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if (client_threads[i] != 0) {
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pthread_cancel(client_threads[i]);
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pthread_join(client_threads[i], NULL);
|
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client_threads[i] = 0;
|
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}
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}
|
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num_client_threads = 0;
|
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pthread_mutex_unlock(&thread_count_mutex);
|
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|
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// Cleanup resources
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cleanup_openssl();
|
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|
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cleanup_thread_pool();
|
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|
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if (rate_limits) {
|
||||
free(rate_limits);
|
||||
rate_limits = NULL;
|
||||
}
|
||||
|
||||
if (file_cache) {
|
||||
for (int i = 0; i < cache_size; i++) {
|
||||
free(file_cache[i].path);
|
||||
free(file_cache[i].data);
|
||||
free(file_cache[i].mime_type);
|
||||
}
|
||||
free(file_cache);
|
||||
file_cache = NULL;
|
||||
}
|
||||
|
||||
log_event("Server shutdown completed.");
|
||||
}
|
||||
|
||||
@@ -545,8 +720,32 @@ int parse_request_line(char *request_buffer, char *method, char *url, char *prot
|
||||
|
||||
void signal_handler(int sig) {
|
||||
if (sig == SIGINT || sig == SIGTERM) {
|
||||
printf("\nReceived signal %d, initiating shutdown...\n", sig);
|
||||
|
||||
// Set shutdown flags first
|
||||
server_running = 0;
|
||||
log_event("Signal received, shutting down...");
|
||||
config.running = 0;
|
||||
|
||||
// Force close listening sockets to unblock accept()
|
||||
if (http_socket != -1) {
|
||||
shutdown(http_socket, SHUT_RDWR);
|
||||
close(http_socket);
|
||||
http_socket = -1;
|
||||
}
|
||||
|
||||
if (https_socket != -1) {
|
||||
shutdown(https_socket, SHUT_RDWR);
|
||||
close(https_socket);
|
||||
https_socket = -1;
|
||||
}
|
||||
|
||||
// Close epoll fd to unblock epoll_wait
|
||||
if (epoll_fd != -1) {
|
||||
close(epoll_fd);
|
||||
epoll_fd = -1;
|
||||
}
|
||||
|
||||
log_event("Signal received, initiating shutdown...");
|
||||
}
|
||||
}
|
||||
|
||||
@@ -564,23 +763,28 @@ int main() {
|
||||
}
|
||||
|
||||
struct sigaction sa;
|
||||
memset(&sa, 0, sizeof(sa));
|
||||
sa.sa_handler = signal_handler;
|
||||
sigemptyset(&sa.sa_mask);
|
||||
sa.sa_flags = 0;
|
||||
sa.sa_flags = SA_RESTART; // Restart interrupted system calls
|
||||
|
||||
if (sigaction(SIGINT, &sa, NULL) == -1) {
|
||||
perror("sigaction (SIGINT)");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
if (sigaction(SIGTERM, &sa, NULL) == -1) {
|
||||
perror("sigaction (SIGTERM)");
|
||||
if (sigaction(SIGINT, &sa, NULL) == -1 || sigaction(SIGTERM, &sa, NULL) == -1) {
|
||||
perror("Failed to set up signal handlers");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
pthread_t http_thread, https_thread;
|
||||
pthread_create(&http_thread, NULL, start_http_server, NULL);
|
||||
pthread_t http_thread;
|
||||
if (pthread_create(&http_thread, NULL, start_http_server, NULL) != 0) {
|
||||
perror("Failed to create HTTP server thread");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
pthread_t https_thread;
|
||||
if (config.use_https) {
|
||||
pthread_create(&https_thread, NULL, start_https_server, NULL);
|
||||
if (pthread_create(&https_thread, NULL, start_https_server, NULL) != 0) {
|
||||
perror("Failed to create HTTPS server thread");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
}
|
||||
|
||||
while (config.running) {
|
||||
@@ -604,6 +808,7 @@ void log_event(const char *message) {
|
||||
char timestamp[64];
|
||||
strftime(timestamp, sizeof(timestamp), "%Y-%m-%d %H:%M:%S", &tm);
|
||||
|
||||
// Create log directory if it doesn't exist
|
||||
char log_dir[512];
|
||||
strncpy(log_dir, config.log_file, sizeof(log_dir) - 1);
|
||||
log_dir[sizeof(log_dir) - 1] = '\0';
|
||||
@@ -611,11 +816,24 @@ void log_event(const char *message) {
|
||||
|
||||
struct stat st;
|
||||
if (stat(dir_path, &st) != 0) {
|
||||
if (mkdir(dir_path, 0777) != 0) {
|
||||
if (mkdir(dir_path, 0755) != 0) {
|
||||
fprintf(stderr, "Error creating log directory (%s): %s\n", dir_path, strerror(errno));
|
||||
pthread_mutex_unlock(&log_mutex);
|
||||
return;
|
||||
}
|
||||
} else if (!S_ISDIR(st.st_mode)) {
|
||||
fprintf(stderr, "Log path (%s) exists but is not a directory\n", dir_path);
|
||||
pthread_mutex_unlock(&log_mutex);
|
||||
return;
|
||||
}
|
||||
|
||||
// Check log file size and rotate if necessary
|
||||
if (stat(config.log_file, &st) == 0) {
|
||||
if (st.st_size > MAX_LOG_FILE_SIZE) {
|
||||
char backup_log[512];
|
||||
snprintf(backup_log, sizeof(backup_log), "%s.old", config.log_file);
|
||||
rename(config.log_file, backup_log);
|
||||
}
|
||||
}
|
||||
|
||||
FILE *logfile = fopen(config.log_file, "a");
|
||||
@@ -625,10 +843,252 @@ void log_event(const char *message) {
|
||||
return;
|
||||
}
|
||||
|
||||
if (fprintf(logfile, "%s: %s\n", timestamp, message) < 0) {
|
||||
// Format log entry with timestamp, process ID, and thread ID
|
||||
char log_entry[LOG_BUFFER_SIZE];
|
||||
snprintf(log_entry, sizeof(log_entry), "[%s] [PID:%d] [TID:%lu] %s\n",
|
||||
timestamp,
|
||||
getpid(),
|
||||
pthread_self(),
|
||||
message);
|
||||
|
||||
// Write to log file
|
||||
if (fputs(log_entry, logfile) == EOF) {
|
||||
fprintf(stderr, "Error writing to log file: %s\n", strerror(errno));
|
||||
}
|
||||
|
||||
// Ensure log is written immediately
|
||||
fflush(logfile);
|
||||
fclose(logfile);
|
||||
|
||||
// Also print to stdout for debugging if verbose mode is enabled
|
||||
if (config.verbose) {
|
||||
printf("%s", log_entry);
|
||||
fflush(stdout);
|
||||
}
|
||||
|
||||
pthread_mutex_unlock(&log_mutex);
|
||||
}
|
||||
|
||||
char* get_mime_type(const char *filepath) {
|
||||
const char *ext = strrchr(filepath, '.');
|
||||
if (!ext) return strdup("application/octet-stream");
|
||||
|
||||
ext++; // Skip the dot
|
||||
|
||||
if (strcasecmp(ext, "html") == 0 || strcasecmp(ext, "htm") == 0)
|
||||
return strdup("text/html");
|
||||
if (strcasecmp(ext, "css") == 0)
|
||||
return strdup("text/css");
|
||||
if (strcasecmp(ext, "js") == 0)
|
||||
return strdup("application/javascript");
|
||||
if (strcasecmp(ext, "png") == 0)
|
||||
return strdup("image/png");
|
||||
if (strcasecmp(ext, "jpg") == 0 || strcasecmp(ext, "jpeg") == 0)
|
||||
return strdup("image/jpeg");
|
||||
if (strcasecmp(ext, "gif") == 0)
|
||||
return strdup("image/gif");
|
||||
if (strcasecmp(ext, "svg") == 0)
|
||||
return strdup("image/svg+xml");
|
||||
if (strcasecmp(ext, "ico") == 0)
|
||||
return strdup("image/x-icon");
|
||||
if (strcasecmp(ext, "woff") == 0)
|
||||
return strdup("font/woff");
|
||||
if (strcasecmp(ext, "woff2") == 0)
|
||||
return strdup("font/woff2");
|
||||
if (strcasecmp(ext, "ttf") == 0)
|
||||
return strdup("font/ttf");
|
||||
if (strcasecmp(ext, "otf") == 0)
|
||||
return strdup("font/otf");
|
||||
|
||||
// Fallback to using libmagic for unknown types
|
||||
magic_t magic = magic_open(MAGIC_MIME_TYPE);
|
||||
if (magic == NULL) {
|
||||
return strdup("application/octet-stream");
|
||||
}
|
||||
|
||||
if (magic_load(magic, NULL) != 0) {
|
||||
magic_close(magic);
|
||||
return strdup("application/octet-stream");
|
||||
}
|
||||
|
||||
const char *mime = magic_file(magic, filepath);
|
||||
char *result = mime ? strdup(mime) : strdup("application/octet-stream");
|
||||
|
||||
magic_close(magic);
|
||||
return result;
|
||||
}
|
||||
|
||||
char* sanitize_url(const char *url) {
|
||||
if (!url) return NULL;
|
||||
|
||||
size_t url_len = strlen(url);
|
||||
if (url_len == 0 || url_len > 255) return NULL;
|
||||
|
||||
char *sanitized = malloc(url_len + 1);
|
||||
if (!sanitized) {
|
||||
log_event("Memory allocation failed in sanitize_url");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int i, j = 0;
|
||||
int slash_count = 0;
|
||||
int dot_count = 0;
|
||||
|
||||
// Must start with '/'
|
||||
if (url[0] != '/') {
|
||||
sanitized[j++] = '/';
|
||||
}
|
||||
|
||||
for (i = 0; url[i]; i++) {
|
||||
if (j >= 255) { // Prevent buffer overflow
|
||||
free(sanitized);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Reset dot count on directory change
|
||||
if (url[i] == '/') {
|
||||
dot_count = 0;
|
||||
slash_count++;
|
||||
if (slash_count > 10) { // Limit directory depth
|
||||
free(sanitized);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
// Count consecutive dots
|
||||
if (url[i] == '.') {
|
||||
dot_count++;
|
||||
if (dot_count > 1) { // Prevent directory traversal
|
||||
free(sanitized);
|
||||
return NULL;
|
||||
}
|
||||
} else {
|
||||
dot_count = 0;
|
||||
}
|
||||
|
||||
// Only allow safe characters
|
||||
if (isalnum((unsigned char)url[i]) ||
|
||||
url[i] == '/' ||
|
||||
url[i] == '.' ||
|
||||
url[i] == '-' ||
|
||||
url[i] == '_') {
|
||||
sanitized[j++] = url[i];
|
||||
}
|
||||
}
|
||||
|
||||
// Ensure proper termination
|
||||
sanitized[j] = '\0';
|
||||
|
||||
// Additional security checks
|
||||
if (strstr(sanitized, "//") || // No double slashes
|
||||
strstr(sanitized, "./") || // No current directory
|
||||
strstr(sanitized, "..") || // No parent directory
|
||||
strstr(sanitized, "/.") || // No hidden files
|
||||
strlen(sanitized) < 1) { // Must have content
|
||||
free(sanitized);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return sanitized;
|
||||
}
|
||||
|
||||
int check_rate_limit(const char *ip) {
|
||||
pthread_mutex_lock(&rate_limit_mutex);
|
||||
|
||||
time_t now = time(NULL);
|
||||
int i;
|
||||
|
||||
// Clean up expired entries
|
||||
for (i = 0; i < rate_limit_count; i++) {
|
||||
if (now - rate_limits[i].window_start >= RATE_LIMIT_WINDOW) {
|
||||
if (i < rate_limit_count - 1) {
|
||||
memcpy(&rate_limits[i], &rate_limits[rate_limit_count-1], sizeof(RateLimit));
|
||||
}
|
||||
rate_limit_count--;
|
||||
i--;
|
||||
}
|
||||
}
|
||||
|
||||
// Find or create entry for this IP
|
||||
for (i = 0; i < rate_limit_count; i++) {
|
||||
if (strcmp(rate_limits[i].ip, ip) == 0) {
|
||||
if (now - rate_limits[i].window_start >= RATE_LIMIT_WINDOW) {
|
||||
rate_limits[i].window_start = now;
|
||||
rate_limits[i].request_count = 1;
|
||||
} else if (rate_limits[i].request_count >= MAX_REQUESTS) {
|
||||
pthread_mutex_unlock(&rate_limit_mutex);
|
||||
return 0; // Rate limit exceeded
|
||||
} else {
|
||||
rate_limits[i].request_count++;
|
||||
}
|
||||
pthread_mutex_unlock(&rate_limit_mutex);
|
||||
return 1; // Request allowed
|
||||
}
|
||||
}
|
||||
|
||||
// Add new entry
|
||||
rate_limits = realloc(rate_limits, (rate_limit_count + 1) * sizeof(RateLimit));
|
||||
strncpy(rate_limits[rate_limit_count].ip, ip, INET_ADDRSTRLEN);
|
||||
rate_limits[rate_limit_count].window_start = now;
|
||||
rate_limits[rate_limit_count].request_count = 1;
|
||||
rate_limit_count++;
|
||||
|
||||
pthread_mutex_unlock(&rate_limit_mutex);
|
||||
return 1; // Request allowed
|
||||
}
|
||||
|
||||
void initialize_thread_pool() {
|
||||
thread_pool = calloc(MAX_THREAD_POOL_SIZE, sizeof(ThreadInfo));
|
||||
if (!thread_pool) {
|
||||
perror("Failed to allocate thread pool");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
}
|
||||
|
||||
void cleanup_thread_pool() {
|
||||
for (int i = 0; i < thread_pool_size; i++) {
|
||||
if (thread_pool[i].busy) {
|
||||
pthread_cancel(thread_pool[i].thread);
|
||||
pthread_join(thread_pool[i].thread, NULL);
|
||||
}
|
||||
}
|
||||
free(thread_pool);
|
||||
}
|
||||
|
||||
void cache_file(const char *path, const char *data, size_t size, const char *mime_type) {
|
||||
pthread_mutex_lock(&cache_mutex);
|
||||
|
||||
if (cache_size >= MAX_CACHE_SIZE) {
|
||||
// Remove least recently used entry
|
||||
int lru_index = 0;
|
||||
time_t oldest = file_cache[0].last_access;
|
||||
|
||||
for (int i = 1; i < cache_size; i++) {
|
||||
if (file_cache[i].last_access < oldest) {
|
||||
oldest = file_cache[i].last_access;
|
||||
lru_index = i;
|
||||
}
|
||||
}
|
||||
|
||||
free(file_cache[lru_index].path);
|
||||
free(file_cache[lru_index].data);
|
||||
free(file_cache[lru_index].mime_type);
|
||||
|
||||
// Move last entry to this position
|
||||
if (lru_index < cache_size - 1) {
|
||||
memmove(&file_cache[lru_index], &file_cache[cache_size - 1], sizeof(CacheEntry));
|
||||
}
|
||||
cache_size--;
|
||||
}
|
||||
|
||||
file_cache = realloc(file_cache, (cache_size + 1) * sizeof(CacheEntry));
|
||||
file_cache[cache_size].path = strdup(path);
|
||||
file_cache[cache_size].data = malloc(size);
|
||||
memcpy(file_cache[cache_size].data, data, size);
|
||||
file_cache[cache_size].size = size;
|
||||
file_cache[cache_size].last_access = time(NULL);
|
||||
file_cache[cache_size].mime_type = strdup(mime_type);
|
||||
cache_size++;
|
||||
|
||||
pthread_mutex_unlock(&cache_mutex);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user