/********************************************************/

/*  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_sem.h>

#include <ntapi/ntapi.h>

#include "ntapi_impl.h"

static const nt_guid	g_sempid    = NT_IPC_GUID_SEMPID;

static const wchar16_t	p_sempid[6] = NT_IPC_OBJDIR_PREFIX_SEMPID;

static int32_t __semctl_get_service_attr(

	nt_rtdata *		rtdata,

	nt_tty_service_info *	semctl)

{

	nt_iosb iosb;

	/* inherited runtime data? */

	if (rtdata->semctl_keys[0]) {

		semctl->attr.ver_major = 0;

		semctl->attr.ver_minor = 0;

		semctl->attr.options   = 0;

		semctl->attr.flags     = 0;

		semctl->attr.type    = rtdata->semctl_type;

		semctl->attr.subtype = rtdata->semctl_subtype;

		semctl->attr.keys.key[0] = rtdata->semctl_keys[0];

		semctl->attr.keys.key[1] = rtdata->semctl_keys[1];

		semctl->attr.keys.key[2] = rtdata->semctl_keys[2];

		semctl->attr.keys.key[3] = rtdata->semctl_keys[3];

		semctl->attr.keys.key[4] = rtdata->semctl_keys[4];

		semctl->attr.keys.key[5] = rtdata->semctl_keys[5];

		__ntapi->tt_guid_copy(

			&semctl->attr.guid,

			&rtdata->semctl_guid);

		return NT_STATUS_SUCCESS;

	}

	/* obtain service info */

	return __ntapi->tty_query_information_service(

		0,&iosb,

		semctl,&(nt_guid)NT_PORT_GUID_SEMCTL,

		0,0);

}

static int32_t __semctl_server_connect(

	nt_rtdata *		rtdata,

	nt_tty_service_info *	semctl)

{

	int32_t status;

	/* already cononected? */

	if (rtdata->hsemctl)

		return NT_STATUS_SUCCESS;

	/* connect */

	if ((status = __ntapi->ipc_connect_by_attr(

			&rtdata->hsemctl,

			&semctl->attr,

			false)))

		return status;

	/* update */

	rtdata->semctl_type    = semctl->attr.type;

	rtdata->semctl_subtype = semctl->attr.subtype;

	rtdata->semctl_keys[0] = semctl->attr.keys.key[0];

	rtdata->semctl_keys[1] = semctl->attr.keys.key[1];

	rtdata->semctl_keys[2] = semctl->attr.keys.key[2];

	rtdata->semctl_keys[3] = semctl->attr.keys.key[3];

	rtdata->semctl_keys[4] = semctl->attr.keys.key[4];

	rtdata->semctl_keys[5] = semctl->attr.keys.key[5];

	__ntapi->tt_guid_copy(

		&rtdata->semctl_guid,

		&semctl->attr.guid);

	return NT_STATUS_SUCCESS;

}

static int32_t __sempid_symlink_set(

	nt_rtdata *		rtdata,

	nt_tty_service_info *	semctl)

{

	int32_t			status;

	void *			hpiddir;

	nt_port_name		svcname;

	nt_unicode_string	str;

	if (rtdata->hsempid)

		return NT_STATUS_SUCCESS;

	if (!rtdata->hsempiddir) {

		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_sempid,&g_sempid)))

			return status;

		if (at_locked_cas((intptr_t *)&rtdata->hsempiddir,0,(intptr_t)hpiddir))

			__ntapi->zw_close(hpiddir);

	}

	__ntapi->tt_port_name_from_attr(

		&svcname,&semctl->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->hsempid,

		NT_SEC_STANDARD_RIGHTS_ALL,

		rtdata->hsempiddir,

		0,&str,

		pe_get_current_process_id());

}

static int32_t	__stdcall __sem_open(

	void *			hipc,

	nt_sem_info *		sem,

	uint32_t		access,

	nt_object_attributes *	oa,

	nt_iosb *		iosb,

	uint32_t		share,

	uint32_t		semslots,

	uint32_t		key,

	uint32_t		id,

	uint32_t		opcode)

{

	int32_t			status;

	nt_tty_port_msg		msg;

	nt_iosb			siosb;

	nt_tty_service_info	semctl;

	nt_runtime_data *	rtdata;

	/* init */

	rtdata = (__ntapi_internals())->rtdata;

	/* semctl service attributes */

	if (!rtdata->hsempid)

		if ((status = __semctl_get_service_attr(rtdata,&semctl)))

			return status;

	/* semctl server */

	if ((status = __semctl_server_connect(rtdata,&semctl)))

		return status;

	/* sempid symlink */

	if ((status = __sempid_symlink_set(rtdata,&semctl)))

		return status;

	/* hipc */

	if (!hipc && (opcode == NT_TTY_SEM_ALLOC))

		hipc = (__ntapi_internals())->rtdata->hsemctl;

	/* obtain sem 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_sem_info_msg) - sizeof(msg.header);

	msg.header.msg_size		= sizeof(msg);

	msg.ttyinfo.opcode		= opcode;

	msg.seminfo.semkey		= (int32_t)key;

	msg.seminfo.semid		= (int32_t)id;

	msg.seminfo.semslots		= semslots;

	msg.seminfo.ntattr		= oa->obj_attr;

	msg.seminfo.ntaccess		= access;

	msg.seminfo.ntshare		= share;

	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 semaphore? */

	if (opcode == NT_TTY_SEM_ALLOC)

		if ((status = __ntapi->ipc_connect_by_attr(

				&hipc,&msg.svcinfo.attr,

				false)))

			return status;

	/* all done */

	__ntapi->tt_aligned_block_memset(

		(uintptr_t *)sem,

		0,sizeof(*sem));

	sem->semkey = msg.svcinfo.key;

	sem->semid  = msg.svcinfo.id;

	sem->hport = hipc;

	return NT_STATUS_SUCCESS;

}

int32_t	__stdcall __ntapi_sem_create(

	__in	void *			hport,

	__out	nt_sem_info *		sem,

	__in	uint32_t		access,

	__in	nt_object_attributes *	oa,

	__out	nt_iosb *		iosb,

	__in	uint32_t		share,

	__in	uint32_t		nslots)

{

	uint32_t key;

	/* validate */

	if (!oa->root_dir)

		return NT_STATUS_DIRECTORY_SERVICE_REQUIRED;

	if (oa->obj_name && !oa->obj_name->strlen) {

		key = 0;

	} else if (oa->obj_name) {

		if (oa->obj_name->strlen != 8 * sizeof(wchar16_t))

			return NT_STATUS_OBJECT_NAME_INVALID;

		if (__ntapi->tt_hex_utf16_to_uint32(oa->obj_name->buffer,&key))

			return NT_STATUS_OBJECT_NAME_INVALID;

	} else {

		key = 0;

	}

	/* open semaphore */

	return __sem_open(

		hport,sem,access,

		oa,iosb,share,nslots,

		key,0,NT_TTY_SEM_ALLOC);

}

int32_t	__stdcall __ntapi_sem_open(

	__in	void *			hport,

	__out	nt_sem_info *		sem,

	__in	uint32_t		access,

	__in	nt_object_attributes *	oa,

	__out	nt_iosb *		iosb,

	__in	uint32_t		share,

	__in	uint32_t		nslots)

{

	int32_t			status;

	uint32_t		key;

	uint32_t		id;

	void *			hsymlink;

	nt_oa			ipcoa;

	void *			hipc;

	nt_rtdata *		rtdata;

	nt_tty_service_info	semctl;

	/* 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 != 8 * sizeof(wchar16_t))

		return NT_STATUS_OBJECT_NAME_INVALID;

	if (__ntapi->tt_hex_utf16_to_uint32(oa->obj_name->buffer,&key))

		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 __sem_open(

					hport,sem,access,

					oa,iosb,share,nslots,

					key,0,NT_TTY_SEM_ALLOC);

			else

				return status;

		default:

			return status;

	}

	/* semctl service attributes */

	if (!rtdata->hsempid)

		if ((status = __semctl_get_service_attr(rtdata,&semctl)))

			return status;

	/* semctl server */

	if ((status = __semctl_server_connect(rtdata,&semctl)))

		return status;

	/* sempid symlink */

	if ((status = __sempid_symlink_set(rtdata,&semctl)))

		return status;

	/* ipc connect */

	status = __ntapi->ipc_connect_by_symlink(

		&hipc,hsymlink,false);

	__ntapi->zw_close(

		hsymlink);

	if (status)

		return status;

	/* open by id? */

	if (oa->obj_attr & NT_OBJ_OPENLINK) {

		id  = key;

		key = 0;

	} else {

		id  = 0;

	}

	return __sem_open(

		hipc,sem,access,

		oa,iosb,share,nslots,

		key,id,NT_TTY_SEM_OPEN);

}