/*

 * Copyright (C) 2018 Red Hat, Inc

 *

 * 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 Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>

 */

#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 <gnutls/gnutls.h>

#include <gnutls/dtls.h>

#include <signal.h>

#include <assert.h>

#include "cert-common.h"

#include "utils.h"

/* This program is a reproducer for issue #543; the timeout

 * of DTLS handshake when a NewSessionTicket is lost.

 */

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 void client(int fd, const char *prio)

{

	int ret;

	gnutls_certificate_credentials_t x509_cred;

	gnutls_session_t session;

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(6);

	}

	gnutls_certificate_allocate_credentials(&x509_cred);

	assert(gnutls_init(&session, GNUTLS_CLIENT|GNUTLS_DATAGRAM)>=0);

	assert(gnutls_priority_set_direct(session, prio, NULL)>=0);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	gnutls_transport_set_int(session, fd);

	do {

		ret = gnutls_handshake(session);

	}

	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

	if (ret < 0) {

		fail("client: Handshake failed: %s\n", gnutls_strerror(ret));

	} else {

		if (debug)

			success("client: Handshake was completed\n");

	}

	gnutls_record_set_timeout(session, 30*1000);

	do {

		ret = gnutls_bye(session, GNUTLS_SHUT_WR);

	} while(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

}

static ssize_t

server_push(gnutls_transport_ptr_t tr, const void *data, size_t len)

{

	const uint8_t *d = data;

	static int dropped = 0;

	if (d[13] == GNUTLS_HANDSHAKE_NEW_SESSION_TICKET) {

		if (dropped == 0) {

			success("dropping message: %s\n", gnutls_handshake_description_get_name(d[13]));

			dropped = 1;

			return len;

		}

	}

	return send((long)tr, data, len, 0);

}

static void server(int fd, const char *prio)

{

	int ret;

	char buffer[MAX_BUF + 1];

	gnutls_session_t session;

	gnutls_certificate_credentials_t x509_cred;

	gnutls_datum_t skey;

	memset(buffer, 0, sizeof(buffer));

	if (debug) {

		gnutls_global_set_log_function(server_log_func);

		gnutls_global_set_log_level(6);

	}

	assert(gnutls_certificate_allocate_credentials(&x509_cred)>=0);

	assert(gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,

					    &server_key,

					    GNUTLS_X509_FMT_PEM)>=0);

	assert(gnutls_init(&session, GNUTLS_SERVER|GNUTLS_DATAGRAM)>=0);

	assert(gnutls_session_ticket_key_generate(&skey)>=0);

	assert(gnutls_session_ticket_enable_server(session, &skey) >= 0);

	gnutls_transport_set_push_function(session, server_push);

	assert(gnutls_priority_set_direct(session, prio, NULL)>=0);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	gnutls_transport_set_int(session, fd);

	do {

		ret = gnutls_handshake(session);

	} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

	if (ret < 0) {

		/* failure is expected here */

		goto end;

	}

	if (debug) {

		success("server: Handshake was completed\n");

	}

	gnutls_record_set_timeout(session, 30*1000);

	success("waiting for EOF\n");

	do {

		ret = gnutls_record_recv(session, buffer, sizeof(buffer));

	} while(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret != 0)

		fail("error waiting for EOF: %s\n", gnutls_strerror(ret));

 end:

	close(fd);

	gnutls_deinit(session);

	gnutls_free(skey.data);

	gnutls_certificate_free_credentials(x509_cred);

	if (debug)

		success("server: finished\n");

}

static void ch_handler(int sig)

{

	return;

}

static

void start(const char *prio)

{

	int fd[2];

	int ret, status = 0;

	pid_t child;

	success("trying %s\n", prio);

	signal(SIGCHLD, ch_handler);

	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) {

		/* parent */

		close(fd[1]);

		client(fd[0], prio);

		waitpid(child, &status, 0);

		check_wait_status(status);

	} else {

		close(fd[0]);

		server(fd[1], prio);

		exit(0);

	}

	return;

}

void doit(void)

{

	start("NORMAL:-VERS-ALL:+VERS-DTLS1.2");

}

#endif				/* _WIN32 */