/*
* Copyright (C) 2014 Nikos Mavrogiannopoulos
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* GnuTLS is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuTLS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GnuTLS; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#if defined(_WIN32)
int main()
{
exit(77);
}
#else
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <gnutls/gnutls.h>
#include <gnutls/dtls.h>
#include <assert.h>
#include "utils.h"
#define TXT1 "hello there"
#define TXT1_SIZE (sizeof(TXT1)-1)
#define TXT2 "2hello there"
#define TXT2_SIZE (sizeof(TXT2)-1)
static void terminate(void);
static void server_log_func(int level, const char *str)
{
fprintf(stderr, "server|<%d>| %s", level, str);
}
static void client_log_func(int level, const char *str)
{
fprintf(stderr, "client|<%d>| %s", level, str);
}
#define MAX_BUF 1024
static ssize_t
push(gnutls_transport_ptr_t tr, const void *data, size_t len)
{
int fd = (long int) tr;
static int counter = 0;
if (counter % 2 == 0) {
errno = EAGAIN;
counter++;
return -1;
}
return send(fd, data, len, 0);
}
static void client(int fd, const char *prio)
{
int ret;
gnutls_anon_client_credentials_t anoncred;
gnutls_session_t session;
/* Need to enable anonymous KX specifically. */
global_init();
if (debug) {
gnutls_global_set_log_function(client_log_func);
gnutls_global_set_log_level(4711);
}
gnutls_anon_allocate_client_credentials(&anoncred);
/* Initialize TLS session
*/
gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM);
gnutls_dtls_set_mtu(session, 1500);
gnutls_handshake_set_timeout(session, 20 * 1000);
/* Use default priorities */
assert(gnutls_priority_set_direct(session, prio, NULL) >= 0);
/* put the anonymous credentials to the current session
*/
gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
gnutls_transport_set_int(session, fd);
/* Perform the TLS handshake
*/
do {
ret = gnutls_handshake(session);
}
while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (ret < 0) {
fail("client: Handshake failed\n");
gnutls_perror(ret);
exit(1);
} else {
if (debug)
success("client: Handshake was completed\n");
}
if (debug)
success("client: TLS version is: %s\n",
gnutls_protocol_get_name
(gnutls_protocol_get_version(session)));
gnutls_transport_set_push_function(session, push);
do {
ret = gnutls_record_send(session, TXT1, TXT1_SIZE);
if (ret == GNUTLS_E_AGAIN) {
if (debug) success("discarding\n");
gnutls_record_discard_queued(session);
}
} while (ret == GNUTLS_E_INTERRUPTED);
do {
ret = gnutls_record_send(session, TXT2, TXT2_SIZE);
} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
gnutls_bye(session, GNUTLS_SHUT_WR);
close(fd);
gnutls_deinit(session);
gnutls_anon_free_client_credentials(anoncred);
gnutls_global_deinit();
}
/* These are global */
pid_t child;
static void terminate(void)
{
int status;
kill(child, SIGTERM);
wait(&status);
exit(1);
}
static void server(int fd, const char *prio)
{
int ret;
gnutls_anon_server_credentials_t anoncred;
char buffer[MAX_BUF + 1];
gnutls_session_t session;
/* this must be called once in the program
*/
global_init();
if (debug) {
gnutls_global_set_log_function(server_log_func);
gnutls_global_set_log_level(4711);
}
gnutls_anon_allocate_server_credentials(&anoncred);
gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);
gnutls_handshake_set_timeout(session, 20 * 1000);
gnutls_dtls_set_mtu(session, 1500);
/* avoid calling all the priority functions, since the defaults
* are adequate.
*/
assert(gnutls_priority_set_direct(session, prio, NULL) >= 0);
gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
gnutls_transport_set_int(session, fd);
do {
ret = gnutls_handshake(session);
}
while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (ret < 0) {
close(fd);
gnutls_deinit(session);
fail("server: Handshake has failed (%s)\n\n",
gnutls_strerror(ret));
terminate();
}
if (debug)
success("server: Handshake was completed\n");
if (debug)
success("server: TLS version is: %s\n",
gnutls_protocol_get_name
(gnutls_protocol_get_version(session)));
/* see the Getting peer's information example */
/* print_info(session); */
do {
ret = gnutls_record_recv(session, buffer, sizeof(buffer));
} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
if (ret != TXT2_SIZE || memcmp(buffer, TXT2, TXT2_SIZE) != 0) {
fail("didn't receive the expected data!\n");
terminate();
}
if (ret < 0) {
close(fd);
gnutls_deinit(session);
fail("server: data sending has failed (%s)\n\n",
gnutls_strerror(ret));
terminate();
}
/* do not wait for the peer to close the connection.
*/
gnutls_bye(session, GNUTLS_SHUT_WR);
close(fd);
gnutls_deinit(session);
gnutls_anon_free_server_credentials(anoncred);
gnutls_global_deinit();
if (debug)
success("server: finished\n");
}
static
void start(const char *prio)
{
int fd[2];
int ret;
signal(SIGPIPE, SIG_IGN);
ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
if (ret < 0) {
perror("socketpair");
exit(1);
}
child = fork();
if (child < 0) {
perror("fork");
fail("fork");
exit(1);
}
if (child) {
int status;
/* parent */
server(fd[0], prio);
wait(&status);
check_wait_status(status);
} else {
close(fd[0]);
client(fd[1], prio);
exit(0);
}
}
void doit(void)
{
start("NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL");
start("NONE:+VERS-DTLS1.2:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL");
}
#endif /* _WIN32 */