/*

 * Copyright (C) 2013 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) || !defined(ENABLE_ALPN)

int main(int argc, char **argv)

{

	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 "utils.h"

static void terminate(void);

/* This program tests whether the gnutls_record_get_state() works as

 * expected.

 */

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);

}

/* These are global */

static pid_t child;

/* A very basic DTLS client, with anonymous authentication, that negotiates SRTP

 */

static void dump(const char *name, uint8_t *data, unsigned data_size)

{

	unsigned i;

	fprintf(stderr, "%s", name);

	for (i=0;i

		fprintf(stderr, "%.2x", (unsigned)data[i]);

	fprintf(stderr, "\n");

}

static void terminate(void)

{

	int status = 0;

	kill(child, SIGTERM);

	wait(&status);

	exit(1);

}

static void client(int fd)

{

	gnutls_session_t session;

	int ret;

	gnutls_anon_client_credentials_t anoncred;

	gnutls_datum_t mac_key, iv, cipher_key;

	gnutls_datum_t read_mac_key, read_iv, read_cipher_key;

	unsigned char rseq_number[8];

	unsigned char wseq_number[8];

	unsigned char key_material[512], *p;

	unsigned i;

	unsigned block_size, hash_size, key_size, iv_size;

	const char *err;

	/* 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);

	/* Use default priorities */

	ret = gnutls_priority_set_direct(session,

				   "NONE:+VERS-TLS1.0:+AES-128-CBC:+SHA1:+SIGN-ALL:+COMP-NULL:+ANON-DH:+ANON-ECDH:+CURVE-ALL",

				   &err;;

	if (ret < 0) {

		fail("client: priority set failed (%s): %s\n",

		     gnutls_strerror(ret), err);

		exit(1);

	}

	/* 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: %s\n", strerror(ret));

		terminate();

	} 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)));

	ret = gnutls_cipher_get(session);

	if (ret != GNUTLS_CIPHER_AES_128_CBC) {

		fprintf(stderr, "negotiated unexpected cipher: %s\n", gnutls_cipher_get_name(ret));

		terminate();

	}

	ret = gnutls_mac_get(session);

	if (ret != GNUTLS_MAC_SHA1) {

		fprintf(stderr, "negotiated unexpected mac: %s\n", gnutls_mac_get_name(ret));

		terminate();

	}

	iv_size = 16;

	hash_size = 20;

	key_size = 16;

	block_size = 2*hash_size + 2*key_size + 2 *iv_size;

	ret = gnutls_prf(session, 13, "key expansion", 1, 0, NULL, block_size,

			 (void*)key_material);

	if (ret < 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		gnutls_perror(ret);

		terminate();

	}

	p = key_material;

	/* check whether the key material matches our calculations */

	ret = gnutls_record_get_state(session, 0, &mac_key, &iv, &cipher_key, wseq_number);

	if (ret < 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		gnutls_perror(ret);

		terminate();

	}

	if (memcmp(wseq_number, "\x00\x00\x00\x00\x00\x00\x00\x01", 8) != 0) {

		dump("wseq:", wseq_number, 8);

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	ret = gnutls_record_get_state(session, 1, &read_mac_key, &read_iv, &read_cipher_key, rseq_number);

	if (ret < 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		gnutls_perror(ret);

		terminate();

	}

	if (memcmp(rseq_number, "\x00\x00\x00\x00\x00\x00\x00\x01", 8) != 0) {

		dump("rseq:", rseq_number, 8);

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	if (hash_size != mac_key.size || memcmp(p, mac_key.data, hash_size) != 0) {

		dump("MAC:", mac_key.data, mac_key.size);

		dump("Block:", key_material, block_size);

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	p+= hash_size;

	if (hash_size != read_mac_key.size || memcmp(p, read_mac_key.data, hash_size) != 0) {

		dump("MAC:", read_mac_key.data, read_mac_key.size);

		dump("Block:", key_material, block_size);

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	p+= hash_size;

	if (key_size != cipher_key.size || memcmp(p, cipher_key.data, key_size) != 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	p+= key_size;

	if (key_size != read_cipher_key.size || memcmp(p, read_cipher_key.data, key_size) != 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	p+= key_size;

	if (iv_size != iv.size || memcmp(p, iv.data, iv_size) != 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	p+=iv_size;

	if (iv_size != read_iv.size || memcmp(p, read_iv.data, iv_size) != 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	/* check sequence numbers */

	for (i=0;i<5;i++) {

		ret = gnutls_record_send(session, "hello", 5);

		if (ret < 0) {

			fail("gnutls_record_send: %s\n", gnutls_strerror(ret));

		}

	}

	ret = gnutls_record_get_state(session, 0, NULL, NULL, NULL, wseq_number);

	if (ret < 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		gnutls_perror(ret);

		terminate();

	}

	if (memcmp(wseq_number, "\x00\x00\x00\x00\x00\x00\x00\x06", 8) != 0) {

		dump("wseq:", wseq_number, 8);

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	ret = gnutls_record_get_state(session, 1, NULL, NULL, NULL, rseq_number);

	if (ret < 0) {

		fprintf(stderr, "error in %d\n", __LINE__);

		gnutls_perror(ret);

		terminate();

	}

	if (memcmp(rseq_number, "\x00\x00\x00\x00\x00\x00\x00\x01", 8) != 0) {

		dump("wseq:", wseq_number, 8);

		fprintf(stderr, "error in %d\n", __LINE__);

		terminate();

	}

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(fd);

	gnutls_deinit(session);

	gnutls_anon_free_client_credentials(anoncred);

	gnutls_global_deinit();

}

static void server(int fd)

{

	int ret;

	gnutls_session_t session;

	gnutls_anon_server_credentials_t anoncred;

	gnutls_dh_params_t dh_params;

	char buf[128];

	const gnutls_datum_t p3 =

	    { (unsigned char *) pkcs3, strlen(pkcs3) };

	/* 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_dh_params_init(&dh_params);

	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);

	gnutls_anon_set_server_dh_params(anoncred, dh_params);

	gnutls_init(&session, GNUTLS_SERVER);

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

	 * are adequate.

	 */

	ret = gnutls_priority_set_direct(session,

				   "NORMAL:+ANON-DH:+ANON-ECDH:-VERS-ALL:+VERS-TLS1.0", NULL);

	if (ret < 0) {

		fail("server: priority set failed (%s)\n\n",

		     gnutls_strerror(ret));

		terminate();

	}

	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)));

	do {

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

	} while(ret > 0);

	if (ret < 0) {

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

	}

	/* 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_dh_params_deinit(dh_params);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

static void start(void)

{

	int fd[2];

	int ret;

	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]);

		wait(&status);

		check_wait_status(status);

	} else {

		close(fd[0]);

		client(fd[1]);

		exit(0);

	}

}

void doit(void)

{

	start();

}

#endif				/* _WIN32 */