#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>

#if defined(_WIN32)

int main(void)
{
	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/crypto.h>
#include <gnutls/dtls.h>
#include <gnutls/socket.h>
#include <signal.h>
#include <assert.h>
#include <errno.h>

#include "cert-common.h"
#include "utils.h"
#include "ktls_utils.h"

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
#define MSG "Hello world!"

static void client(int fd, const char *prio)
{
	int ret;
	char buffer[MAX_BUF + 1];
	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);

	gnutls_init(&session, GNUTLS_CLIENT);
	gnutls_handshake_set_timeout(session, 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\n");
		goto end;
	}
	if (debug)
		success("client: Handshake was completed\n");

	ret = gnutls_transport_is_ktls_enabled(session);
	if (!(ret & GNUTLS_KTLS_RECV)) {
		fail("client: KTLS was not properly initialized\n");
		goto end;
	}

	/* server send message via gnutls_record_send */
	memset(buffer, 0, sizeof(buffer));
	do {
		ret = gnutls_record_recv(session, buffer, sizeof(buffer));
	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret == 0) {
		if (debug)
			success("client: Peer has closed the TLS connection\n");
		goto end;
	} else if (ret < 0) {
		fail("client: Error: %s\n", gnutls_strerror(ret));
		goto end;
	}

	if (strncmp(buffer, MSG, ret)) {
		fail("client: Message doesn't match\n");
		goto end;
	}

	if (debug)
		success("client: messages received\n");

	/* server send message via gnutls_record_sendfile */
	memset(buffer, 0, sizeof(buffer));
	do {
		ret = gnutls_record_recv(session, buffer, sizeof(buffer));
	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret == 0) {
		if (debug)
			success("client: Peer has closed the TLS connection\n");
		goto end;
	} else if (ret < 0) {
		fail("client: Error: %s\n", gnutls_strerror(ret));
		goto end;
	}

	if (strncmp(buffer, MSG, ret)) {
		fail("client: Message doesn't match\n");
		goto end;
	}

	if (debug)
		success("client: messages received\n");

	ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
	if (ret < 0) {
		fail("client: error in closing session: %s\n",
		     gnutls_strerror(ret));
	}

	ret = 0;
end:

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

	if (ret != 0)
		exit(1);
}

pid_t child;
static void terminate(void)
{
	assert(child);
	kill(child, SIGTERM);
	exit(1);
}

static void server(int fd, const char *prio)
{
	int ret;
	gnutls_certificate_credentials_t x509_cred;
	gnutls_session_t session;

	global_init();

	if (debug) {
		gnutls_global_set_log_function(server_log_func);
		gnutls_global_set_log_level(7);
	}

	gnutls_certificate_allocate_credentials(&x509_cred);
	ret = gnutls_certificate_set_x509_key_mem(
		x509_cred, &server_cert, &server_key, GNUTLS_X509_FMT_PEM);
	if (ret < 0)
		exit(1);

	gnutls_init(&session, GNUTLS_SERVER);
	gnutls_handshake_set_timeout(session, 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("server: Handshake has failed (%s)\n\n",
		     gnutls_strerror(ret));
		goto end;
	}
	if (debug)
		success("server: Handshake was completed\n");

	ret = gnutls_transport_is_ktls_enabled(session);
	if (!(ret & GNUTLS_KTLS_SEND)) {
		fail("server: KTLS was not properly initialized\n");
		goto end;
	}
	do {
		ret = gnutls_record_send(session, MSG, strlen(MSG) + 1);
	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret < 0) {
		fail("server: data sending has failed (%s)\n\n",
		     gnutls_strerror(ret));
		goto end;
	}

	/* send file
	 */
	FILE *fp = tmpfile();
	if (fp == NULL) {
		fail("temporary file for testing couldn't be created");
		ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
		if (ret < 0)
			fail("server: error in closing session: %s\n",
			     gnutls_strerror(ret));
		goto end;
	}

	fputs(MSG, fp);
	rewind(fp);

	off_t offset = 0;
	if (fp == NULL) {
		fail("server: couldn't open file for testing ...send_file() function");
		goto end;
	}

	do {
		ret = gnutls_record_send_file(session, fileno(fp), &offset,
					      512);
	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret < 0) {
		fail("server: data sending has failed (%s)\n\n",
		     gnutls_strerror(ret));
		goto end;
	}

	ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
	if (ret < 0)
		fail("server: error in closing session: %s\n",
		     gnutls_strerror(ret));

	ret = 0;
end:
	close(fd);
	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

	if (ret) {
		terminate();
	}

	if (debug)
		success("server: finished\n");
}

static void ch_handler(int sig)
{
	return;
}

static void run(const char *prio)
{
	int ret;
	int client_fd, server_fd;

	success("running ktls test with %s\n", prio);

	signal(SIGCHLD, ch_handler);
	signal(SIGPIPE, SIG_IGN);

	if ((ret = create_socket_pair(&client_fd, &server_fd))) {
		fail("Error in socket creation: %d\n", ret);
		exit(1);
	}

	child = fork();
	if (child < 0) {
		fail("error in fork(): %s\n", strerror(errno));
		exit(1);
	}

	if (child) {
		/* parent */
		int status;
		close(client_fd);

		server(server_fd, prio);

		wait(&status);
		check_wait_status(status);
	} else {
		close(server_fd);
		sleep(1);

		client(client_fd, prio);

		exit(0);
	}
}

void doit(void)
{
	run("NORMAL:-VERS-ALL:+VERS-TLS1.2:-CIPHER-ALL:+AES-128-GCM");
	run("NORMAL:-VERS-ALL:+VERS-TLS1.2:-CIPHER-ALL:+AES-256-GCM");
	if (!gnutls_fips140_mode_enabled()) {
		run("NORMAL:-VERS-ALL:+VERS-TLS1.2:-CIPHER-ALL:+CHACHA20-POLY1305");
	}
	run("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-128-GCM");
	run("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-256-GCM");
	if (!gnutls_fips140_mode_enabled()) {
		run("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+CHACHA20-POLY1305");
	}
#if defined(__linux__)
	run("NORMAL:-VERS-ALL:+VERS-TLS1.2:-CIPHER-ALL:+AES-128-CCM");
	run("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-128-CCM");
#endif
}

#endif /* _WIN32 */
