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

/*  ptycon: a pty-console bridge                         */

/*  Copyright (C) 2016--2017  SysDeer Technologies, LLC  */

/*  Released under GPLv2 and GPLv3; see COPYING.PTYCON.  */

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

#include <psxtypes/psxtypes.h>

#include <ntapi/ntapi.h>

#include <ptycon/ptycon.h>

#include "ptycon_daemon_impl.h"

#include "ptycon_driver_impl.h"

#define PTYC_VTBL_ELEMENTS   PTYC_DAEMON_OPCODE_CAP - PTYC_DAEMON_OPCODE_BASE

static ptyc_daemon_routine * ptyc_daemon_vtbl[PTYC_VTBL_ELEMENTS] = {

	ptyc_daemon_connect,

	0,

	ptyc_daemon_signal,

	0,

	0,

	0

};

static int ptyc_init_pidmap_target_symlink(struct ptyc_daemon_ctx * dctx)

{

	int     status;

	void *  hkeydir;

	struct ptyc_driver_ctx_impl * ictx = ptyc_get_driver_ictx(dctx->driver_ctx);

	if ((status = ntapi->tt_create_keyed_object_directory(

			&hkeydir,

			NT_SYMBOLIC_LINK_ALL_ACCESS,

			ictx->rtdata->hpidmapdir,

			pe_get_current_process_id())))

		return status;

	if ((status = ntapi->zw_set_information_object(

			hkeydir,

			NT_OBJECT_HANDLE_INFORMATION,

			&(nt_object_handle_information){0,0},

			sizeof(nt_object_handle_information))))

		return status;

	return ntapi->tt_create_keyed_object_directory_entry(

		&ictx->hntpipc,

		NT_SYMBOLIC_LINK_ALL_ACCESS,

		hkeydir,

		dctx->hport_daemon,0,

		pe_get_current_process_id());

}

static int ptyc_init_ntpipc_target_symlink(struct ptyc_daemon_ctx * dctx)

{

	struct ptyc_driver_ctx_impl * ictx = ptyc_get_driver_ictx(dctx->driver_ctx);

	return ntapi->tt_create_keyed_object_directory_entry(

		&ictx->hntpipc,

		NT_SYMBOLIC_LINK_ALL_ACCESS,

		ictx->rtdata->hntpipcdir,

		dctx->hport_daemon,0,

		pe_get_current_process_id());

}

int32_t __stdcall ptyc_daemon_loop(void * ctx)

{

	int                             status;

	struct ptyc_daemon_ctx *	dctx;

	nt_rtdata *			rtdata;

	nt_tty_port_msg			inbuf;

	nt_tty_port_msg			outbuf;

	nt_tty_port_msg *		request;

	nt_tty_port_msg *		reply;

	intptr_t			port_id;

	int32_t				opcode;

	if (ntapi->tt_get_runtime_data(&rtdata,0))

		return NT_STATUS_INTERNAL_ERROR;

	dctx = (struct ptyc_daemon_ctx *)ctx;

	/* pidmap daemon symlink */

	if ((status = ptyc_init_pidmap_target_symlink(dctx)))

		return status;

	/* ntpipc daemon symlink */

	if ((status = ptyc_init_ntpipc_target_symlink(dctx)))

		return status;

	/* init */

	request = &inbuf;

	ntapi->tt_aligned_block_memset(

		request,0,sizeof(*request));

	/* get first message */

	ntapi->zw_reply_wait_receive_port(

		dctx->hport_daemon,

		&port_id,

		0,(nt_port_message *)request);

	/* message loop */

	do {

		switch (request->header.msg_type) {

			case NT_LPC_REQUEST:

			case NT_LPC_DATAGRAM:

				opcode = request->ttyinfo.opcode;

				break;

			case NT_LPC_CONNECTION_REQUEST:

				opcode = PTYC_DAEMON_CONNECT;

				break;

			default:

				opcode = -1;

				break;

		}

		/* dispatch */

		reply = &outbuf;

		ntapi->tt_aligned_block_memcpy(

			(uintptr_t *)reply,

			(uintptr_t *)request,

			sizeof(*reply));

		reply->header.msg_type = NT_LPC_REPLY;

		if ((opcode >= PTYC_DAEMON_OPCODE_BASE) && (opcode < PTYC_DAEMON_OPCODE_CAP)) {

			reply->ttyinfo.exarg = (void *)request->header.client_id.process_id;

			opcode -= PTYC_DAEMON_OPCODE_BASE;

			if (ptyc_daemon_vtbl[opcode])

				reply->ttyinfo.status = ptyc_daemon_vtbl[opcode](reply);

			else

				reply->ttyinfo.status = NT_STATUS_NOT_IMPLEMENTED;

		} else {

			reply->ttyinfo.exarg    = NT_INVALID_HANDLE_VALUE;

			reply->ttyinfo.status   = NT_STATUS_LPC_INVALID_CONNECTION_USAGE;

		}

		ntapi->tt_aligned_block_memset(

			request,0,sizeof(*request));

		reply = reply->ttyinfo.exarg

			? &outbuf : 0;

		if (!reply)

			ntapi->zw_reply_wait_receive_port(

				dctx->hport_daemon,

				&port_id,

				0,&request->header);

		else if (reply->header.client_id.process_id == rtdata->cid_self.process_id)

			ntapi->zw_reply_wait_receive_port(

				dctx->hport_daemon,

				&port_id,

				&reply->header,

				&request->header);

		else {

			ntapi->zw_reply_port(

				dctx->hport_daemon,

				&reply->header);

			ntapi->zw_reply_wait_receive_port(

				dctx->hport_daemon,

				&port_id,

				0,&request->header);

		}

	} while (request->header.msg_id);

	return NT_STATUS_INTERNAL_ERROR;

}