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

/*  toksvc: a framework-native token broker service      */

/*  Copyright (C) 2020  Z. Gilboa                        */

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

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

#include <ntapi/ntapi.h>

#include <ntapi/nt_atomic.h>

#include <ntapi/nt_fsctl.h>

#include <stdint.h>

#include <toksvc/toksvc.h>

#include "toksvc_init_impl.h"

#include "toksvc_nolibc_impl.h"

#define ARGV_DRIVER

#include "toksvc_version.h"

#include "toksvc_daemon_impl.h"

#include "toksvc_dprintf_impl.h"

#include "toksvc_driver_impl.h"

#include "argv/argv.h"

#undef   strlen

/* pty integration */

#include <psxtypes/section/freestd.h>

__attr_section_decl__(".freestd")

static const nt_tty_affiliation tty_affiliation

	__attr_section__(".freestd")

	= NT_TTY_AFFILIATION_DEFAULT;

/* ntapi accessor table */

const ntapi_vtbl * toks_ntapi;

/* daemon */

static struct toks_daemon_ctx toks_daemon_ctx;

static const  nt_guid toks_daemon_default_guid = TOKS_PORT_GUID_DAEMON;

static const  wchar16_t toks_service_name[6]   = TOKS_PORT_NAME_PREFIX;

/* package info */

static const struct toks_source_version toks_src_version = {

	TOKS_TAG_VER_MAJOR,

	TOKS_TAG_VER_MINOR,

	TOKS_TAG_VER_PATCH,

	TOKSVC_GIT_VERSION

};

struct toks_driver_ctx_alloc {

	struct argv_meta *		meta;

	struct toks_driver_ctx_impl	ctx;

	uint64_t			guard;

};

struct toks_split_vector {

	char **		targv;

	char **		eargv;

};

static uint32_t toks_argv_flags(uint32_t flags)

{

	uint32_t ret = ARGV_CLONE_VECTOR;

	if (flags & TOKS_DRIVER_VERBOSITY_NONE)

		ret |= ARGV_VERBOSITY_NONE;

	if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

		ret |= ARGV_VERBOSITY_ERRORS;

	if (flags & TOKS_DRIVER_VERBOSITY_STATUS)

		ret |= ARGV_VERBOSITY_STATUS;

	return ret;

}

static int toks_driver_usage(

	const char *			program,

	const char *			arg,

	const struct argv_option **	optv,

	struct argv_meta *		meta)

{

	char header[512];

	snprintf(header,sizeof(header),

		"Usage: %s [options] <file>...\n" "Options:\n",

		program);

	argv_usage(STDOUT_FILENO,header,optv,arg);

	argv_free(meta);

	return TOKS_USAGE;

}

static int64_t toks_arg_to_int64(struct argv_entry * entry)

{

	int64_t      ret;

	const char * ch;

	for (ret=0, ch=entry->arg; *ch && (ret>=0); ch++) {

		if ((*ch < '0') || (*ch >'9'))

			return (-1);

		ret *= 10;

		ret += (*ch - '0');

	}

	return ret;

}

static int32_t toks_arg_to_int32(struct argv_entry * entry)

{

	int64_t ret = toks_arg_to_int64(entry);

	return (ret >= 0) && (ret <= 0x7fffffff)

		? ret : (-1);

}

static int32_t toks_query_performance_counters_failover(nt_filetime * ticks)

{

	(void)ticks;

	return 0;

}

static int32_t toks_daemon_library_once;

static int32_t toks_daemon_library_init(void)

{

	int32_t		status;

	int		argc;

	char **		argv;

	char **		envp;

	nt_rtdata *	rtdata;

	nt_timeout	timeout;

	switch (at_locked_cas_32(&toks_daemon_library_once,0,1)) {

		case 0:

			status = ntapi->tt_get_argv_envp_utf8(

				&argc,&argv,&envp,

				0,0,0);

			if (status) {

				at_store_32(&toks_daemon_library_once,3);

				return status;

			}

			if ((status = ntapi->tt_get_runtime_data(&rtdata,0))) {

				at_store_32(&toks_daemon_library_once,3);

				return status;

			}

			if (!rtdata->argv) {

				rtdata->argc = argc;

				rtdata->argv = argv;

				rtdata->envp = envp;

			}

			ntapi->tt_guid_copy(

				&rtdata->srv_guid,

				&toks_daemon_default_guid);

			at_locked_inc_32(&toks_daemon_library_once);

			return 0;

		case 1:

			timeout.quad = -10;

			for (; (at_locked_cas_32(&toks_daemon_library_once,0,1) == 1); )

				ntapi->zw_delay_execution(

					NT_SYNC_ALERTABLE,

					&timeout);

			return (toks_daemon_library_once == 2)

				? 0 : -1;

		case 2:

			return 0;

		case 3:

		default:

			return -1;

	}

	return NT_STATUS_INTERNAL_ERROR;

}

static struct toks_driver_ctx_impl * toks_driver_ctx_alloc(

	struct argv_meta *		meta,

	const struct toks_common_ctx *	cctx)

{

	struct toks_driver_ctx_alloc *	ictx;

	size_t				size;

	nt_runtime_data *		rtdata;

	switch (ntapi->tt_get_runtime_data(&rtdata,0)) {

		case NT_STATUS_SUCCESS:

			break;

		case NT_STATUS_MORE_PROCESSING_REQUIRED:

			toks_daemon_library_init();

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

				return 0;

			break;

		default:

			return 0;

	}

	size =  sizeof(struct toks_driver_ctx_alloc);

	if (!(ictx = calloc(1,size)))

		return 0;

	if (cctx)

		memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx));

	ictx->ctx.ticks.qpc         = toks_query_performance_counters_failover;

	ictx->ctx.ticks.pcfreq.quad = 0;

	ictx->meta = meta;

	ictx->ctx.rtdata = rtdata;

	return &ictx->ctx;

}

static int toks_get_driver_ctx_fail(struct argv_meta * meta)

{

	argv_free(meta);

	return -1;

}

#define TOKS_SARGV_ELEMENTS		1024

static int toks_split_argv(

	char **				argv,

	struct toks_split_vector *	sargv)

{

	ptrdiff_t	argc;

	char **		parg;

	/* argc */

	for (parg=argv; *parg; )

		parg++;

	if ((argc = parg - argv) >= TOKS_SARGV_ELEMENTS)

		return -1;

	/* clone argv into targv */

	ntapi->tt_aligned_block_memset(

		(uintptr_t *)sargv->targv,

		0,TOKS_SARGV_ELEMENTS*sizeof(char *));

	ntapi->tt_aligned_block_memcpy(

		(uintptr_t *)sargv->targv,

		(uintptr_t *)argv,

		argc*sizeof(char *));

	/* eargv */

	for (parg=sargv->targv; *parg; parg++) {

		if (!(strcmp(*parg,"-e")) || !(strcmp(*parg,"--exec"))) {

			sargv->eargv = &argv[parg-sargv->targv];

			sargv->eargv++;

			*parg = 0;

			return 0;

		}

	}

	return 0;

}

static int32_t toks_set_tmpfs_from_uuid(struct toks_driver_ctx_impl * ctx)

{

	int32_t						status;

	void *						htmproot;

	void *						hsvcroot;

	nt_oa						oa;

	nt_iosb						iosb;

	nt_unicode_string				path;

	uint32_t					access;

	nt_sd_common_buffer				sd;

	nt_large_integer				alloc_size;

	nt_guid_str_utf16				guidstr;

	uint32_t					access_owner;

	uint32_t					access_group;

	uint32_t					access_other;

	uint32_t					access_admin;

	wchar16_t					tmproot[3] = {'t','m','p'};

	wchar16_t					toksvc[6]  = {'t','o','k','s','v','c'};

	/* sd */

	access_owner  = NT_GENERIC_ALL|NT_SEC_SPECIFIC_RIGHTS_ALL;

	access_admin  = access_owner;

	access_group  = NT_GENERIC_READ | NT_GENERIC_WRITE | NT_GENERIC_EXECUTE;

	access_group |= NT_SEC_READ_CONTROL | NT_FILE_READ_ATTRIBUTES;

	access_other  = NT_GENERIC_READ | NT_GENERIC_EXECUTE;

	access_other |= NT_SEC_READ_CONTROL | NT_FILE_READ_ATTRIBUTES;

	ntapi->acl_init_common_descriptor(

		&sd,0,0,0,0,

		access_owner,access_group,access_other,

		access_admin,access_owner,

		0);

	/* oa */

	oa.len      = sizeof(nt_oa);

	oa.root_dir = 0;

	oa.obj_name = &pat;;

	oa.obj_attr = 0;

	oa.sec_desc = &sd.sd;

	oa.sec_qos  = 0;

	/* alloc_size (always zero) */

	alloc_size.quad = 0;

	/* access */

	access  = NT_SEC_SYNCHRONIZE | NT_SEC_READ_CONTROL | NT_FILE_READ_ATTRIBUTES;

	access |= NT_FILE_LIST_DIRECTORY | NT_FILE_ADD_FILE | NT_FILE_ADD_SUBDIRECTORY;

	access |= NT_FILE_TRAVERSE | NT_FILE_DELETE_CHILD;

	/* /tmp or alternative */

	if (ctx->rtdata->htmpfslroot) {

		if ((status = ntapi->zw_duplicate_object(

				ctx->rtdata->hself,

				ctx->rtdata->htmpfslroot,

				ctx->rtdata->hself,

				&htmproot,

				0,0,

				NT_DUPLICATE_SAME_ATTRIBUTES|NT_DUPLICATE_SAME_ACCESS)))

			return status;

	} else {

		path.maxlen = 0;

		path.strlen = sizeof(tmproot);

		path.buffer = tmproot;

		oa.root_dir = ctx->rtdata->hroot;

		if ((status = ntapi->zw_create_file(

				&htmproot,

				access,&oa,&iosb,

				&alloc_size,

				NT_FILE_ATTRIBUTE_DIRECTORY,

				NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE | NT_FILE_SHARE_DELETE,

				NT_FILE_OPEN_IF,

				NT_FILE_DIRECTORY_FILE | NT_FILE_SYNCHRONOUS_IO_ALERT,

				0,0)))

			return status;

	}

	/* service tmpfs root */

	path.maxlen = 0;

	path.strlen = sizeof(toksvc);

	path.buffer = toksvc;

	oa.root_dir = htmproot;

	status = ntapi->zw_create_file(

		&hsvcroot,

		access,&oa,&iosb,

		&alloc_size,

		NT_FILE_ATTRIBUTE_DIRECTORY,

		NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE | NT_FILE_SHARE_DELETE,

		NT_FILE_OPEN_IF,

		NT_FILE_DIRECTORY_FILE | NT_FILE_SYNCHRONOUS_IO_ALERT,

		0,0);

	if (status) {

		ntapi->zw_close(htmproot);

		return status;

	}

	/* instance-specific tmpfs root */

	ntapi->tt_guid_to_string_utf16(

		&ctx->guid,

		&guidstr);

	path.maxlen = 0;

	path.strlen = sizeof(guidstr);

	path.buffer = &guidstr.lbrace;

	oa.root_dir = hsvcroot;

	status = ntapi->zw_create_file(

		&ctx->htmpfs,

		access,&oa,&iosb,

		&alloc_size,

		NT_FILE_ATTRIBUTE_DIRECTORY,

		NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE | NT_FILE_SHARE_DELETE,

		NT_FILE_OPEN_IF,

		NT_FILE_DIRECTORY_FILE | NT_FILE_SYNCHRONOUS_IO_ALERT,

		0,0);

	ntapi->zw_close(hsvcroot);

	ntapi->zw_close(htmproot);

	return status;

}

static int32_t toks_set_uuid_from_root(

	struct toks_driver_ctx_impl *   ctx,

	struct _nt_guid *               svcguid)

{

	int32_t                         status;

	nt_iosb                         iosb;

	nt_file_object_id_buffer        objid;

	if (!ctx->rtdata->hroot)

		return NT_STATUS_INVALID_PARAMETER;

	iosb.status = NT_STATUS_PENDING;

	status = ntapi->zw_fs_control_file(

		ctx->rtdata->hroot,

		ctx->hevent,0,0,

		&iosb,

		NT_FSCTL_CREATE_OR_GET_OBJECT_ID,

		0,0,&objid,sizeof(objid));

	if (status == NT_STATUS_PENDING)

		ntapi->zw_wait_for_single_object(

			ctx->hevent,

			NT_SYNC_NON_ALERTABLE,

			0);

	if (iosb.status)

		return iosb.status;

	svcguid->data1    = (objid.obj_id[0]);

	svcguid->data1   |= (objid.obj_id[1] << 8);

	svcguid->data1   |= (objid.obj_id[2] << 16);

	svcguid->data1   |= (objid.obj_id[3] << 24);

	svcguid->data2    = (objid.obj_id[4]);

	svcguid->data2   |= (objid.obj_id[5] << 8);

	svcguid->data3    = (objid.obj_id[6]);

	svcguid->data3   |= (objid.obj_id[7] << 8);

	svcguid->data4[0] = (objid.obj_id[8]);

	svcguid->data4[1] = (objid.obj_id[9]);

	svcguid->data4[2] = (objid.obj_id[10]);

	svcguid->data4[3] = (objid.obj_id[11]);

	svcguid->data4[4] = (objid.obj_id[12]);

	svcguid->data4[5] = (objid.obj_id[13]);

	svcguid->data4[6] = (objid.obj_id[14]);

	svcguid->data4[7] = (objid.obj_id[15]);

	return NT_STATUS_SUCCESS;

}

int toks_get_driver_ctx(

	char **				argv,

	char **				envp,

	uint32_t			flags,

	struct toks_driver_ctx **	pctx)

{

	int32_t				status;

	struct toks_driver_ctx_impl *	ctx;

	struct toks_common_ctx		cctx;

	struct toks_split_vector	sargv;

	const struct argv_option *	optv[TOKS_OPTV_ELEMENTS];

	struct argv_meta *		meta;

	struct argv_entry *		entry;

	struct argv_entry *		uuid;

	struct argv_entry *		pid;

	struct argv_entry *		syspid;

	struct argv_entry *		cfpid;

	struct argv_entry *		cspid;

	struct argv_entry *		msecs;

	struct toks_token_string	key;

	size_t				keylen;

	uintptr_t			opdata;

	nt_guid				svcguid;

	const char *			program;

	const char *			refstr;

	int				ntokens;

	int				atokens;

	int				loglevel;

	int32_t				tokpid;

	int32_t				tsyspid;

	int32_t				ctrlpid;

	int32_t				csyspid;

	int64_t				timeout;

	void *				hlog;

	void *				hkernel32;

	char *				targv[TOKS_SARGV_ELEMENTS];

	(void)envp;

	if (toks_init())

		return -1;

	argv_optv_init(toks_default_options,optv);

	sargv.targv = targv;

	sargv.eargv = 0;

	if (toks_split_argv(argv,&sargv))

		return -1;

	if (!(meta = argv_get(

			sargv.targv,optv,

			toks_argv_flags(flags),

			STDERR_FILENO)))

		return -1;

	if (!(flags & TOKS_DRIVER_MODE_CLIENT))

		flags |= TOKS_DRIVER_MODE_SERVER;

	hlog      = 0;

	uuid      = 0;

	tokpid    = 0;

	tsyspid   = 0;

	ctrlpid   = 0;

	csyspid   = 0;

	keylen    = 0;

	refstr    = 0;

	ntokens   = 0;

	loglevel  = 0;

	timeout   = (-1);

	program   = argv_program_name(argv[0]);

	memset(&cctx,0,sizeof(cctx));

	cctx.drvflags = flags;

	cctx.eargv = sargv.eargv;

	if (!argv[1] && (flags & TOKS_DRIVER_VERBOSITY_USAGE))

		return toks_driver_usage(program,0,optv,meta);

	for (entry=meta->entries; entry->fopt || entry->arg; entry++) {

		if (entry->fopt) {

			switch (entry->tag) {

				case TAG_HELP:

					if (flags & TOKS_DRIVER_VERBOSITY_USAGE)

						return toks_driver_usage(program,entry->arg,optv,meta);

				case TAG_VERSION:

					cctx.drvflags |= TOKS_DRIVER_VERSION;

					break;

				case TAG_DAEMON:

					if (!strcmp("always",entry->arg))

						cctx.drvflags |= TOKS_DRIVER_DAEMON_ALWAYS;

					else if (!strcmp("never",entry->arg))

						cctx.drvflags |= TOKS_DRIVER_DAEMON_NEVER;

					break;

				case TAG_SYSROOT:

					cctx.sysroot = entry->arg;

					break;

				case TAG_UUID:

					uuid = entry;

					break;

				case TAG_ROOTUUID:

					cctx.drvflags |= TOKS_DRIVER_ROOT_UUID;

					break;

				case TAG_REFSTR:

					refstr = entry->arg;

					break;

				case TAG_PID:

					tokpid = toks_arg_to_int32((pid=entry));

					break;

				case TAG_SYSPID:

					tsyspid = toks_arg_to_int32((syspid=entry));

					break;

				case TAG_CTRLPID:

					ctrlpid = toks_arg_to_int32((cfpid=entry));

					break;

				case TAG_CSYSPID:

					csyspid = toks_arg_to_int32((cspid=entry));

					break;

				case TAG_LOGLEVEL:

					loglevel = toks_arg_to_int32(entry);

					loglevel = (loglevel > 9) ? (-1) : loglevel;

					cctx.loglevel = loglevel;

					break;

				case TAG_TIMEOUT:

					timeout = toks_arg_to_int64((msecs=entry));

					timeout = (timeout < 0) ? (-2) : timeout;

					break;

				case TAG_TOKENS:

					ntokens = toks_arg_to_int32(entry);

					ntokens = (ntokens > 9999) ? (-1) : ntokens;

					break;

				case TAG_CONNECT:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					break;

				case TAG_ABORT:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_ABORT;

					break;

				case TAG_ACQUIRE:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_ACQUIRE;

					break;

				case TAG_RELEASE:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_RELEASE;

					keylen = toks_strlen(entry->arg);

					ntapi->tt_generic_memset(

						&key,0,sizeof(key));

					if (keylen < sizeof(key.token))

						ntapi->tt_generic_memcpy(

							&key.token,entry->arg,

							keylen);

					break;

				case TAG_LOGFILE:

					cctx.logfile = entry->arg;

					break;

				case TAG_NTOKENSGET:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_NTOKENS_GET;

					break;

				case TAG_NTOKENSSET:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_NTOKENS_SET;

					ntokens = toks_arg_to_int32(entry);

					break;

				case TAG_GETSVCINFO:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_SVCINFO_GET;

					break;

				case TAG_LOGSVCINFO:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_SVCINFO_LOG;

					break;

				case TAG_GETTOKINFO:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_TOKINFO_GET;

					break;

				case TAG_LOGTOKINFO:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_TOKINFO_LOG;

					break;

				case TAG_LOGLEVELGET:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_LOGLEVEL_GET;

					break;

				case TAG_LOGLEVELSET:

					cctx.drvflags &= ~(uint64_t)TOKS_DRIVER_MODE_SERVER;

					cctx.drvflags |= TOKS_DRIVER_MODE_CLIENT;

					cctx.drvflags |= TOKS_DRIVER_ACTION_LOGLEVEL_SET;

					loglevel = toks_arg_to_int32(entry);

					loglevel = (loglevel > 9) ? (-1) : loglevel;

					cctx.loglevel = loglevel;

					break;

			}

		} else

			/* strict */

			return toks_driver_usage(program,0,optv,meta);

	}

	if ((cctx.drvflags & TOKS_DRIVER_MODE_CLIENT) && (tokpid < 0)) {

		if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

			toks_dprintf(STDERR_FILENO,

				"%s: error: %s is not a valid framework process id.",

				program,pid->arg);

		return toks_get_driver_ctx_fail(meta);

	}

	if ((cctx.drvflags & TOKS_DRIVER_MODE_CLIENT) && (tsyspid < 0)) {

		if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

			toks_dprintf(STDERR_FILENO,

				"%s: error: %s is not a valid system process id.",

				program,syspid->arg);

		return toks_get_driver_ctx_fail(meta);

	}

	if ((cctx.drvflags & TOKS_DRIVER_MODE_SERVER) && (ctrlpid < 0)) {

		if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

			toks_dprintf(STDERR_FILENO,

				"%s: error: %s is not a valid controlling "

				"framework process id.",

				program,cfpid->arg);

		return toks_get_driver_ctx_fail(meta);

	}