gwft.h

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2023  Ammar Faizi <ammarfaizi2@gnuweeb.org>
 * Copyright (C) 2023  Alviro Iskandar Setiawan <alviro.iskandar@gnuweeb.org>
 */
#ifndef GWFT_H
#define GWFT_H

#include <stdint.h>

#ifndef __packed
#define __packed __attribute__((__packed__))
#endif

typedef uint16_t __be16;
typedef uint32_t __be32;
typedef uint64_t __be64;

struct gwft_pkt_handshake {
	__be16		version;
	__be16		patch_level;
	__be16		sub_level;
	uint8_t		extra_len;
	uint8_t		flags;
	char		extra[];
} __packed;

struct gwft_pktcl_get_list_file {
	__be32		limit;
	__be32		offset;
} __packed;

struct gwft_pktsr_list_file {
	__be32		nr_files;
} __packed;

struct gwft_pktsr_file {
	__be64		file_size;
	__be32		id;
	__be16		file_name_len;
	char		file_name[];
} __packed;

struct gwft_pktsr_file_data {
	__be64		offset;
	__be64		len;
	__be32		file_id;
	char		data[];
} __packed;

struct gwft_pktcl_get_file {
	__be64		offset;
	__be64		len;
	__be32		file_id;
} __packed;

enum {
	GWFT_PKT_CLOSE             = 0x00,

	GWFT_PKT_CL_HANDSHAKE      = 0x10,
	GWFT_PKT_CL_GET_LIST_FILE  = 0x11,
	GWFT_PKT_CL_GET_FILE       = 0x12,

	GWFT_PKT_SR_HANDSHAKE      = 0x20,
	GWFT_PKT_SR_LIST_FILE      = 0x21,
	GWFT_PKT_SR_FILE           = 0x22,
	GWFT_PKT_SR_FILE_DATA      = 0x23,
};

struct gwft_pkt {
	uint8_t		type;
	uint8_t		__pad;
	__be16		len;

	union {
		struct gwft_pkt_handshake	handshake;

		struct gwft_pktcl_get_list_file	get_list_file;
		struct gwft_pktcl_get_file	get_file;

		struct gwft_pktsr_list_file	list_file;
		struct gwft_pktsr_file		file;
		struct gwft_pktsr_file_data	file_data;

		char				__raw[4096];
	};
};

int run_server(int argc, char *argv[]);
int run_client(int argc, char *argv[]);

#endif