/********************************************************/
/*  ntapi: Native API core library                      */
/*  Copyright (C) 2013--2021  SysDeer Technologies, LLC */
/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
/********************************************************/

#include <psxtypes/psxtypes.h>
#include <ntapi/nt_file.h>
#include <ntapi/nt_string.h>
#include <ntapi/nt_atomic.h>
#include <ntapi/nt_port.h>
#include <ntapi/nt_ipc.h>
#include <ntapi/nt_afl.h>
#include <ntapi/ntapi.h>
#include "ntapi_impl.h"

static const nt_guid	g_aflpid    = NT_IPC_GUID_AFLPID;
static const wchar16_t	p_aflpid[6] = NT_IPC_OBJDIR_PREFIX_AFLPID;

static int32_t __aflctl_get_service_attr(
	nt_rtdata *		rtdata,
	nt_tty_service_info *	aflctl)
{
	nt_iosb iosb;

	/* inherited runtime data? */
	if (rtdata->aflctl_keys[0]) {
		aflctl->attr.ver_major = 0;
		aflctl->attr.ver_minor = 0;
		aflctl->attr.options   = 0;
		aflctl->attr.flags     = 0;

		aflctl->attr.type    = rtdata->aflctl_type;
		aflctl->attr.subtype = rtdata->aflctl_subtype;

		aflctl->attr.keys.key[0] = rtdata->aflctl_keys[0];
		aflctl->attr.keys.key[1] = rtdata->aflctl_keys[1];
		aflctl->attr.keys.key[2] = rtdata->aflctl_keys[2];
		aflctl->attr.keys.key[3] = rtdata->aflctl_keys[3];
		aflctl->attr.keys.key[4] = rtdata->aflctl_keys[4];
		aflctl->attr.keys.key[5] = rtdata->aflctl_keys[5];

		__ntapi->tt_guid_copy(
			&aflctl->attr.guid,
			&rtdata->aflctl_guid);

		return NT_STATUS_SUCCESS;
	}

	/* obtain service info */
	return __ntapi->tty_query_information_service(
		0,&iosb,aflctl,
		&(nt_guid)NT_PORT_GUID_AFLCTL,
		0,0);
}

static int32_t __aflctl_server_connect(
	nt_rtdata *		rtdata,
	nt_tty_service_info *	aflctl)
{
	int32_t status;

	/* already cononected? */
	if (rtdata->haflctl)
		return NT_STATUS_SUCCESS;

	/* connect */
	if ((status = __ntapi->ipc_connect_by_attr(
			&rtdata->haflctl,
			&aflctl->attr,
			false)))
		return status;

	/* update */
	rtdata->aflctl_type    = aflctl->attr.type;
	rtdata->aflctl_subtype = aflctl->attr.subtype;

	rtdata->aflctl_keys[0] = aflctl->attr.keys.key[0];
	rtdata->aflctl_keys[1] = aflctl->attr.keys.key[1];
	rtdata->aflctl_keys[2] = aflctl->attr.keys.key[2];
	rtdata->aflctl_keys[3] = aflctl->attr.keys.key[3];
	rtdata->aflctl_keys[4] = aflctl->attr.keys.key[4];
	rtdata->aflctl_keys[5] = aflctl->attr.keys.key[5];

	__ntapi->tt_guid_copy(
		&rtdata->aflctl_guid,
		&aflctl->attr.guid);

	return NT_STATUS_SUCCESS;
}

static int32_t __aflpid_symlink_set(
	nt_rtdata *		rtdata,
	nt_tty_service_info *	aflctl)
{
	int32_t			status;
	void *			hpiddir;
	nt_port_name		svcname;
	nt_unicode_string	str;

	if (rtdata->haflpid)
		return NT_STATUS_SUCCESS;

	if (!rtdata->haflpiddir) {
		if ((status = __ntapi->tt_open_ipc_object_directory(
				&hpiddir,
				NT_SEC_READ_CONTROL
					| NT_DIRECTORY_QUERY
					| NT_DIRECTORY_TRAVERSE
					| NT_DIRECTORY_CREATE_OBJECT
					| NT_DIRECTORY_CREATE_SUBDIRECTORY,
				p_aflpid,&g_aflpid)))
			return status;

		if (at_locked_cas((intptr_t *)&rtdata->haflpiddir,0,(intptr_t)hpiddir))
			__ntapi->zw_close(hpiddir);
	}

	__ntapi->tt_port_name_from_attr(
		&svcname,&aflctl->attr);

	str.strlen = (uint16_t)(__offsetof(nt_port_name,null_termination));
	str.maxlen = sizeof(nt_port_name);
	str.buffer = svcname.base_named_objects;

	return __ntapi->tt_create_ipc_object_directory_entry(
		&rtdata->haflpid,
		NT_SEC_STANDARD_RIGHTS_ALL,
		rtdata->haflpiddir,
		0,&str,
		pe_get_current_process_id());

}

static int32_t	__stdcall __afl_open(
	void *			hipc,
	nt_afl_info *		afl,
	nt_iosb *		iosb,
	nt_guid *		afldev,
	uint32_t		opcode)
{
	int32_t			status;
	nt_tty_port_msg		msg;
	nt_iosb			siosb;
	nt_tty_service_info	aflctl;
	nt_runtime_data *	rtdata;

	/* init */
	rtdata = (__ntapi_internals())->rtdata;

	/* aflctl service attributes */
	if (!rtdata->haflpid)
		if ((status = __aflctl_get_service_attr(rtdata,&aflctl)))
			return status;

	/* aflctl server */
	if ((status = __aflctl_server_connect(rtdata,&aflctl)))
		return status;

	/* aflpid symlink */
	if ((status = __aflpid_symlink_set(rtdata,&aflctl)))
		return status;

	/* hipc */
	if (!hipc && (opcode == NT_TTY_AFL_ALLOC))
		hipc = (__ntapi_internals())->rtdata->haflctl;

	/* obtain afl info */
	__ntapi->tt_aligned_block_memset(
		&msg,0,sizeof(msg));

	if (!iosb)
		iosb = &siosb;

	msg.header.msg_type		= NT_LPC_NEW_MESSAGE;
	msg.header.data_size		= sizeof(nt_afl_info_msg) - sizeof(msg.header);
	msg.header.msg_size		= sizeof(msg);
	msg.ttyinfo.opcode		= opcode;

	__ntapi->tt_guid_copy(
		&msg.aflinfo.afldev,
		afldev);

	/* todo: device guid */

	if ((status = __ntapi->zw_request_wait_reply_port(hipc,&msg,&msg)))
		return status;
	else if (msg.ttyinfo.status)
		return msg.ttyinfo.status;

	iosb->info   = sizeof(msg.svcinfo);
	iosb->status = NT_STATUS_SUCCESS;

	/* new afl node? */
	if (opcode == NT_TTY_AFL_ALLOC)
		if ((status = __ntapi->ipc_connect_by_attr(
				&hipc,&msg.svcinfo.attr,
				false)))
			return status;

	/* all done */
	__ntapi->tt_aligned_block_memset(
		(uintptr_t *)afl,
		0,sizeof(*afl));

	afl->hport = hipc;

	__ntapi->tt_guid_copy(
		&afl->afldev,
		afldev);

	return NT_STATUS_SUCCESS;
}


int32_t	__stdcall __ntapi_afl_create(
	__in	void *			hport,
	__out	nt_afl_info *		afl,
	__in	nt_oa *			oa,
	__out	nt_iosb *		iosb)
{
	nt_guid afldev;

	/* validate */
	if (!oa->root_dir)
		return NT_STATUS_DIRECTORY_SERVICE_REQUIRED;

	if (!oa->obj_name)
		return NT_STATUS_INVALID_PARAMETER;

	if (oa->obj_name->strlen != sizeof(nt_guid_str_utf16))
		return NT_STATUS_OBJECT_NAME_INVALID;

	if (__ntapi->tt_string_to_guid_utf16(
			(nt_guid_str_utf16 *)oa->obj_name->buffer,
			&afldev))
		return NT_STATUS_OBJECT_NAME_INVALID;

	/* open afldev */
	return __afl_open(
		hport,afl,iosb,
		&afldev,
		NT_TTY_AFL_ALLOC);
}


int32_t	__stdcall __ntapi_afl_open(
	__in	void *			hport,
	__out	nt_afl_info *		afl,
	__in	nt_oa *			oa,
	__out	nt_iosb *		iosb)
{
	int32_t			status;
	nt_guid			afldev;
	void *			hsymlink;
	nt_oa			ipcoa;
	void *			hipc;
	nt_rtdata *		rtdata;
	nt_tty_service_info	aflctl;

	/* init */
	rtdata = (__ntapi_internals())->rtdata;

	/* validate */
	if (!oa->root_dir)
		return NT_STATUS_DIRECTORY_SERVICE_REQUIRED;

	if (!oa->obj_name)
		return NT_STATUS_INVALID_PARAMETER;

	if (oa->obj_name->strlen != sizeof(nt_guid_str_utf16))
		return NT_STATUS_OBJECT_NAME_INVALID;

	if (__ntapi->tt_string_to_guid_utf16(
			(nt_guid_str_utf16 *)oa->obj_name->buffer,
			&afldev))
		return NT_STATUS_OBJECT_NAME_INVALID;

	/* open symlink */
	ipcoa.len      = sizeof(ipcoa);
	ipcoa.root_dir = oa->root_dir;
	ipcoa.obj_name = oa->obj_name;
	ipcoa.obj_attr = 0;
	ipcoa.sec_desc = oa->sec_desc;
	ipcoa.sec_qos  = oa->sec_qos;

	status = __ntapi->zw_open_symbolic_link_object(
		&hsymlink,
		NT_SYMBOLIC_LINK_QUERY,
		&ipcoa);

	switch (status) {
		case NT_STATUS_SUCCESS:
			break;

		case NT_STATUS_OBJECT_NAME_NOT_FOUND:
		case NT_STATUS_OBJECT_PATH_NOT_FOUND:
			if (oa->obj_attr & NT_OBJ_OPENIF)
				return __afl_open(
					hport,afl,iosb,
					&afldev,
					NT_TTY_AFL_ALLOC);
			else
				return status;

		default:
			return status;
	}

	/* aflctl service attributes */
	if (!rtdata->haflpid)
		if ((status = __aflctl_get_service_attr(rtdata,&aflctl)))
			return status;

	/* aflctl server */
	if ((status = __aflctl_server_connect(rtdata,&aflctl)))
		return status;

	/* aflpid symlink */
	if ((status = __aflpid_symlink_set(rtdata,&aflctl)))
		return status;

	/* ipc connect */
	status = __ntapi->ipc_connect_by_symlink(
		&hipc,hsymlink,false);

	__ntapi->zw_close(
		hsymlink);

	if (status)
		return status;

	return __afl_open(
		hipc,afl,iosb,
		&afldev,
		NT_TTY_AFL_OPEN);
}