/*
 * Copyright (c) 2021 - 2021 The GmSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the GmSSL Project.
 *    (http://gmssl.org/)"
 *
 * 4. The name "GmSSL Project" must not be used to endorse or promote
 *    products derived from this software without prior written
 *    permission. For written permission, please contact
 *    guanzhi1980@gmail.com.
 *
 * 5. Products derived from this software may not be called "GmSSL"
 *    nor may "GmSSL" appear in their names without prior written
 *    permission of the GmSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the GmSSL Project
 *    (http://gmssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE GmSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <gmssl/mem.h>
#include <gmssl/sm2.h>
#include <gmssl/tls.h>
#include <gmssl/error.h>


static const char *options = "[-port num] -cert file -key file -pass str [-cacert file]";

int tls13_server_main(int argc , char **argv)
{
	int ret = 1;
	char *prog = argv[0];
	int port = 443;
	char *certfile = NULL;
	char *keyfile = NULL;
	char *pass = NULL;
	char *cacertfile = NULL;

	int server_ciphers[] = { TLS_cipher_sm4_gcm_sm3, };
	uint8_t verify_buf[4096];

	TLS_CTX ctx;
	TLS_CONNECT conn;
	char buf[1600] = {0};
	size_t len = sizeof(buf);

	int sock;
	struct sockaddr_in server_addr;
	struct sockaddr_in client_addr;
	socklen_t client_addrlen;
	int conn_sock;


	argc--;
	argv++;

	if (argc < 1) {
		fprintf(stderr, "usage: %s %s\n", prog, options);
		return 1;
	}

	while (argc > 0) {
		if (!strcmp(*argv, "-help")) {
			printf("usage: %s %s\n", prog, options);
			return 0;
		} else if (!strcmp(*argv, "-port")) {
			if (--argc < 1) goto bad;
			port = atoi(*(++argv));
		} else if (!strcmp(*argv, "-cert")) {
			if (--argc < 1) goto bad;
			certfile = *(++argv);
		} else if (!strcmp(*argv, "-key")) {
			if (--argc < 1) goto bad;
			keyfile = *(++argv);
		} else if (!strcmp(*argv, "-pass")) {
			if (--argc < 1) goto bad;
			pass = *(++argv);
		} else if (!strcmp(*argv, "-cacert")) {
			if (--argc < 1) goto bad;
			cacertfile = *(++argv);
		} else {
			fprintf(stderr, "%s: invalid option '%s'\n", prog, *argv);
			return 1;
bad:
			fprintf(stderr, "%s: option '%s' argument required\n", prog, *argv);
			return 1;
		}
		argc--;
		argv++;
	}
	if (!certfile) {
		fprintf(stderr, "%s: '-cert' option required\n", prog);
		return 1;
	}
	if (!keyfile) {
		fprintf(stderr, "%s: '-key' option required\n", prog);
		return 1;
	}
	if (!pass) {
		fprintf(stderr, "%s: '-pass' option required\n", prog);
		return 1;
	}

	memset(&ctx, 0, sizeof(ctx));
	memset(&conn, 0, sizeof(conn));

	if (tls_ctx_init(&ctx, TLS_protocol_tls13, TLS_server_mode) != 1
		|| tls_ctx_set_cipher_suites(&ctx, server_ciphers, sizeof(server_ciphers)/sizeof(int)) != 1
		|| tls_ctx_set_certificate_and_key(&ctx, certfile, keyfile, pass) != 1) {
		error_print();
		return -1;
	}
	if (cacertfile) {
		if (tls_ctx_set_ca_certificates(&ctx, cacertfile, TLS_DEFAULT_VERIFY_DEPTH) != 1) {
			error_print();
			return -1;
		}
	}

	// Socket
	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		error_print();
		return 1;
	}
	server_addr.sin_family = AF_INET;
	server_addr.sin_addr.s_addr = INADDR_ANY;
	server_addr.sin_port = htons(port);
	if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
		error_print();
		perror("tlcp_accept: bind: ");
		goto end;
	}
	puts("start listen ...\n");
	listen(sock, 1);



restart:

	client_addrlen = sizeof(client_addr);
	if ((conn_sock = accept(sock, (struct sockaddr *)&client_addr, &client_addrlen)) < 0) {
		error_print();
		goto end;
	}
	puts("socket connected\n");

	if (tls_init(&conn, &ctx) != 1
		|| tls_set_socket(&conn, conn_sock) != 1) {
		error_print();
		return -1;
	}

	if (tls_do_handshake(&conn) != 1) {
		error_print(); // 为什么这个会触发呢？
		return -1;
	}

	for (;;) {

		int rv;
		size_t sentlen;

		do {
			len = sizeof(buf);
			if ((rv = tls13_recv(&conn, (uint8_t *)buf, sizeof(buf), &len)) != 1) {
				if (rv < 0) fprintf(stderr, "%s: recv failure\n", prog);
				else fprintf(stderr, "%s: Disconnected by remote\n", prog);

				//close(conn.sock);
				tls_cleanup(&conn);
				goto restart;
			}
		} while (!len);

		if (tls13_send(&conn, (uint8_t *)buf, len, &sentlen) != 1) {
			fprintf(stderr, "%s: send failure, close connection\n", prog);
			close(conn.sock);
			goto end;
		}
	}


end:
	return ret;
}