/* pthread_*() */
#include <pthread.h>
+/* For GnuTLS. */
+#include <gcrypt.h>
+
+GCRY_THREAD_OPTION_PTHREAD_IMPL;
+
+
/* Size of ringbuffer. */
#define RINGBUFFER_SIZE 10
+/* Bit size of Diffie-Hellman key exchange parameters. */
+#define DH_SIZE 1024
+
+
+/* For gnutls_*() functions. */
+#define GNUTLS_ERROR_EXIT(error, message) \
+ if (GNUTLS_E_SUCCESS != error) { \
+ fprintf(stderr, "%s: %s\n", message, gnutls_strerror(error)); \
+ exit(EXIT_FAILURE); \
+ }
+
/* Server should shut down. Set by SIGINT handler. */
static volatile int done;
/* Number of threads. */
static size_t thread_count;
+
/* Synchronized ring buffer storing accept()ed client sockets. */
static int ringbuffer[RINGBUFFER_SIZE];
static int ringbuffer_read;
static void parse_arguments(int argc, char **argv);
static void print_usage(const char *argv);
+static void initialize_gnutls(void);
+static void deinitialize_gnutls(void);
+
static void worker_thread(void);
return EXIT_FAILURE;
}
+ initialize_gnutls();
+
/* Spawn worker threads to handle requests. */
threads = (pthread_t *)malloc(thread_count * sizeof(pthread_t));
if (NULL == threads) {
free(threads);
+ deinitialize_gnutls();
+
free(global_proxy_host);
free(global_proxy_port);
fprintf(stderr, "-t number of threads [default: 10]\n");
}
+static void initialize_gnutls(void) {
+ int result;
+ gcry_error_t error = 0;
+
+ /* Thread safe setup. Must be called before gnutls_global_init(). */
+ error = gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
+ if (error) {
+ fprintf(stderr, "gcry_control(): %s/%s\n", gcry_strsource(error),
+ gcry_strerror(error));
+ exit(EXIT_FAILURE);
+ }
+ /* Prevent usage of blocking /dev/random. */
+ error = gcry_control(GCRYCTL_ENABLE_QUICK_RANDOM, 0);
+ if (error) {
+ fprintf(stderr, "gcry_control(): %s/%s\n", gcry_strsource(error),
+ gcry_strerror(error));
+ exit(EXIT_FAILURE);
+ }
+
+ /* Initialize GnuTLS. */
+ result = gnutls_global_init();
+ GNUTLS_ERROR_EXIT(result, "gnutls_global_init()");
+
+ /* Setup GnuTLS cipher suites. */
+ result = gnutls_priority_init(&tls_priority_cache, "NORMAL", NULL);
+ GNUTLS_ERROR_EXIT(result, "gnutls_priority_init()");
+
+ /* Generate Diffie-Hellman parameters. */
+ result = gnutls_dh_params_init(&tls_dh_params);
+ GNUTLS_ERROR_EXIT(result, "gnutls_dh_params_init()");
+ result = gnutls_dh_params_generate2(tls_dh_params, DH_SIZE);
+ GNUTLS_ERROR_EXIT(result, "gnutls_dh_params_generate2()");
+}
+static void deinitialize_gnutls(void) {
+ gnutls_dh_params_deinit(tls_dh_params);
+ gnutls_priority_deinit(tls_priority_cache);
+
+ gnutls_global_deinit();
+}
+
static void worker_thread(void) {
int client_socket;