#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"

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 inicialized\n");
		goto end;
	}

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

	if (ret == 0) {
			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 inicialized\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;
	}

	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;
	struct sockaddr_in saddr;
	socklen_t addrlen;
	int listener;
	int fd;

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

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

	listener = socket(AF_INET, SOCK_STREAM, 0);
	if (listener == -1){
		fail("error in listener(): %s\n", strerror(errno));
	}

	memset(&saddr, 0, sizeof(saddr));
	saddr.sin_family = AF_INET;
	saddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	saddr.sin_port = 0;

	ret = bind(listener, (struct sockaddr*)&saddr, sizeof(saddr));
	if (ret == -1){
		fail("error in bind(): %s\n", strerror(errno));
	}

	addrlen = sizeof(saddr);
	ret = getsockname(listener, (struct sockaddr*)&saddr, &addrlen);
	if (ret == -1){
		fail("error in getsockname(): %s\n", strerror(errno));
	}

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

	if (child) {
		int status;
		/* parent */
		ret = listen(listener, 1);
		if (ret == -1) {
			fail("error in listen(): %s\n", strerror(errno));
		}

		fd = accept(listener, NULL, NULL);
		if (fd == -1) {
			fail("error in accept(): %s\n", strerror(errno));
		}
		server(fd, prio);

		wait(&status);
		check_wait_status(status);
	} else {
		fd = socket(AF_INET, SOCK_STREAM, 0);
		if (fd == -1){
			fail("error in socket(): %s\n", strerror(errno));
			exit(1);
		}
		usleep(1000000);
		connect(fd, (struct sockaddr*)&saddr, addrlen);
		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");
	run("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-128-GCM");
	run("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-256-GCM");
}

#endif				/* _WIN32 */