/*

 * 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 <time.h>

#include <gnutls/gnutls.h>

#include <signal.h>

#include <assert.h>

#include "utils.h"

#include "cert-common.h"

#include "tls13/ext-parse.h"

/* This program tests gnutls_ext_raw_parse with GNUTLS_EXT_RAW_FLAG_TLS_CLIENT_HELLO

 * flag.

 */

#define HOSTNAME "example.com"

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);

}

static unsigned found_server_name = 0;

static unsigned found_status_req = 0;

static unsigned bare_version = 0;

static int ext_callback(void *ctx, unsigned tls_id, const unsigned char *data, unsigned size)

{

	if (tls_id == 0) { /* server name */

		/* very interesting extension, 4 bytes of sizes

		 * and 1 byte of type. */

		unsigned esize = (data[0] << 8) | data[1];

		assert(esize == strlen(HOSTNAME)+3);

		size -= 2;

		data += 2;

		assert(data[0] == 0);

		data++;

		size--;

		esize = (data[0] << 8) | data[1];

		assert(esize == strlen(HOSTNAME));

		data += 2;

		size -= 2;

		assert(memcmp(data, HOSTNAME, strlen(HOSTNAME)) == 0);

		found_server_name = 1;

	} else if (tls_id == 5) {

		found_status_req = 1;

	} else {

		if (debug)

			success("found extension: %u\n", tls_id);

	}

	return 0;

}

static int handshake_callback(gnutls_session_t session, unsigned int htype,

	unsigned post, unsigned int incoming, const gnutls_datum_t *msg)

{

	int ret;

	if (htype == GNUTLS_HANDSHAKE_CLIENT_HELLO && post) {

		if (bare_version) {

			ret = gnutls_ext_raw_parse(NULL, ext_callback, msg, GNUTLS_EXT_RAW_FLAG_TLS_CLIENT_HELLO);

		} else {

			unsigned pos;

			gnutls_datum_t mmsg;

			assert(msg->size >= HANDSHAKE_SESSION_ID_POS);

			pos = HANDSHAKE_SESSION_ID_POS;

			SKIP8(pos, msg->size);

			SKIP16(pos, msg->size);

			SKIP8(pos, msg->size);

			mmsg.data = &msg->data[pos];

			mmsg.size = msg->size - pos;

			ret = gnutls_ext_raw_parse(NULL, ext_callback, &mmsg, 0);

		}

		assert(ret >= 0);

	}

	return 0;

}

static void client(int fd)

{

	int ret;

	gnutls_certificate_credentials_t x509_cred;

	gnutls_session_t session;

	global_init();

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(7);

	}

	gnutls_certificate_allocate_credentials(&x509_cred);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	/* Use default priorities */

	gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.2", NULL);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	gnutls_transport_set_int(session, fd);

	assert(gnutls_server_name_set(session, GNUTLS_NAME_DNS, HOSTNAME, strlen(HOSTNAME))>=0);

	/* Perform the TLS handshake

	 */

	do {

		ret = gnutls_handshake(session);

	}

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

	if (ret == GNUTLS_E_UNSUPPORTED_SIGNATURE_ALGORITHM) {

		/* success */

		goto end;

	}

	if (ret < 0) {

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

	} 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_bye(session, GNUTLS_SHUT_WR);

      end:

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

}

static void server(int fd)

{

	int ret;

	gnutls_session_t session;

	gnutls_certificate_credentials_t x509_cred;

	/* 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_certificate_allocate_credentials(&x509_cred);

	gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,

					    &server_key,

					    GNUTLS_X509_FMT_PEM);

	gnutls_init(&session, GNUTLS_SERVER);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CLIENT_HELLO,

					   GNUTLS_HOOK_POST,

					   handshake_callback);

	/* avoid calling all the priority functions, since the defaults

	 * are adequate.

	 */

	gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.2", NULL);

	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");

	if (debug)

		success("server: TLS version is: %s\n",

			gnutls_protocol_get_name

			(gnutls_protocol_get_version(session)));

	assert(found_server_name != 0);

	assert(found_status_req != 0);

	gnutls_bye(session, GNUTLS_SHUT_WR);

 end:

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

static void ch_handler(int sig)

{

	return;

}

static void start(unsigned val)

{

	int fd[2];

	int ret, status = 0;

	pid_t child;

	signal(SIGCHLD, ch_handler);

	signal(SIGPIPE, SIG_IGN);

	bare_version = val;

	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]);

		server(fd[0]);

		waitpid(child, &status, 0);

		check_wait_status(status);

	} else {

		close(fd[0]);

		client(fd[1]);

		exit(0);

	}

	return;

}

void doit(void)

{

	start(0);

	start(1);

}

#endif				/* _WIN32 */