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

/*  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 <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"

/* 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 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;

			}

			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;

		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;

}

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 *		msecs;

	struct toks_token_string	key;

	size_t				keylen;

	nt_guid				svcguid;

	const char *			program;

	const char *			refstr;

	const char *			ch;

	int				ntokens;

	int32_t				tokpid;

	int64_t				timeout;

	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;

	uuid    = 0;

	tokpid  = 0;

	keylen  = 0;

	ntokens = 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_REFSTR:

					refstr = entry->arg;

					break;

				case TAG_PID:

					pid = entry;

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

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

							tokpid = -1;

						else

							tokpid = tokpid * 10 + (*ch - '0');

					break;

				case TAG_TIMEOUT:

					msecs = entry;

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

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

							timeout = -2;

						else if ((ch - entry->arg) > 15)

							timeout = -2;

						else

							timeout = timeout * 10 + (*ch - '0');

					break;

				case TAG_TOKENS:

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

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

							ntokens = -1;

						else if (ntokens >= 1000)

							ntokens = -1;

						else

							ntokens = ntokens * 10 + (*ch - '0');

					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;

			}

		} 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 process id.",

				program,pid->arg);

		return toks_get_driver_ctx_fail(meta);

	}

	if ((cctx.drvflags & TOKS_DRIVER_MODE_CLIENT) && (timeout < (-1))) {

		if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

			toks_dprintf(STDERR_FILENO,

				"%s: error: %s is not a valid timeout in milliseconds.",

				program,msecs->arg);

		return toks_get_driver_ctx_fail(meta);

	}

	if ((cctx.drvflags & TOKS_DRIVER_MODE_SERVER) && (ntokens <= 0)) {

		if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

			toks_dprintf(STDERR_FILENO,

				"%s: error: number of tokens not set or is invalid.",

				program);

		return toks_get_driver_ctx_fail(meta);

	}

	if (uuid && ntapi->tt_string_to_guid_utf8(uuid->arg,&svcguid)) {

		if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

			toks_dprintf(STDERR_FILENO,

				"%s: error: '%s' is not a valid service guid (did you forget the braces?)",

				program,uuid->arg);

		return toks_get_driver_ctx_fail(meta);

	}

	if (cctx.sysroot && toks_open_dir(&cctx.hroot,0,cctx.sysroot,false)) {

		if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

			toks_dprintf(STDERR_FILENO,

				"%s: error: could not open sysroot directory '%s'",

				program,cctx.sysroot);

		return toks_get_driver_ctx_fail(meta);

	}

	if (!(ctx = toks_driver_ctx_alloc(meta,&cctx)))

		return toks_get_driver_ctx_fail(meta);

	if ((cctx.drvflags & TOKS_DRIVER_ACTION_RELEASE)) {

		if (toks_client_str_to_token(&ctx->ctx,&key)) {

			if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

				toks_dprintf(STDERR_FILENO,

					"%s: error: [%s] is not a valid token.",

					program,key.token);

			return toks_get_driver_ctx_fail(meta);

		}

	}

	ntapi->tt_guid_copy(

		&ctx->uuid,

		uuid ? &svcguid : &ctx->rtdata->srv_guid);

	if ((toks_ntapi->tt_create_private_event(

			&ctx->hevent,

			NT_NOTIFICATION_EVENT,

			NT_EVENT_NOT_SIGNALED)))

		return toks_get_driver_ctx_fail(meta);

	if ((ntapi->tt_open_dev_object_directory(

			&ctx->hsvcdir,

			NT_SEC_READ_CONTROL

				| NT_DIRECTORY_QUERY

				| NT_DIRECTORY_TRAVERSE

				| NT_DIRECTORY_CREATE_OBJECT

				| NT_DIRECTORY_CREATE_SUBDIRECTORY,

			toks_service_name,

			&toks_daemon_default_guid)))

		return toks_get_driver_ctx_fail(meta);

	if ((hkernel32 = pe_get_kernel32_module_handle()))

		if ((ctx->ticks.qpc = pe_get_procedure_address(

				hkernel32,"QueryPerformanceCounter")))

			ntapi->zw_query_performance_counter(

				&(nt_filetime){{0,0}},

				&ctx->ticks.pcfreq);

	ctx->tokpid             = tokpid;

	ctx->ntokens            = ntokens;

	ctx->timeout            = timeout;

	ctx->ctx.program	= program;

	ctx->ctx.cctx		= &ctx->cctx;

	ctx->cctx.uuid          = &ctx->uuid;

	toks_set_driver_refstr(&ctx->ctx,refstr);

	if (cctx.drvflags & TOKS_DRIVER_MODE_SERVER) {

		if (!(ctx->waiters = toks_calloc(

				TOKS_MAX_WAITERS,

				sizeof(struct toks_waiter))))

			return toks_get_driver_ctx_fail(meta);

		toks_daemon_ctx.driver_ctx   = &ctx->ctx;

		toks_daemon_ctx.waiter_base  = ctx->waiters;

		toks_daemon_ctx.waiter_first = ctx->waiters;

		toks_daemon_ctx.waiter_next  = ctx->waiters;

		toks_daemon_ctx.waiter_cap   = &ctx->waiters[TOKS_MAX_WAITERS];

		if (!(ctx->tokens = toks_calloc(ntokens,sizeof(*ctx->tokens))))

			return toks_get_driver_ctx_fail(meta);

		if (toks_daemon_init(&toks_daemon_ctx,&ctx->uuid))

			return toks_get_driver_ctx_fail(meta);

	}

	if (cctx.drvflags & TOKS_DRIVER_MODE_CLIENT) {

		if (cctx.drvflags & TOKS_DRIVER_DAEMON_ALWAYS) {

			toks_daemon_ctx.driver_ctx = &ctx->ctx;

			switch ((status = toks_daemon_init(&toks_daemon_ctx,0))) {

				case NT_STATUS_SUCCESS:

					break;

				default:

					if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

						toks_dprintf(STDERR_FILENO,

							"%s: error: failed to initialize signal handling "

							"(check the system's documentation) [0x%x].",

							program,status);

					return toks_get_driver_ctx_fail(meta);

			}

		}

		switch ((status = toks_client_connect(&ctx->ctx))) {

			case NT_STATUS_SUCCESS:

				break;

			case NT_STATUS_OBJECT_NAME_NOT_FOUND:

				if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

					toks_dprintf(STDERR_FILENO,

						"%s: error: could not connect "

						"(server not running) [0x%x].",

						program,status);

				return toks_get_driver_ctx_fail(meta);

			case NT_STATUS_CONNECTION_REFUSED:

			case NT_STATUS_PORT_CONNECTION_REFUSED:

				if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

					toks_dprintf(STDERR_FILENO,

						"%s: error: could not connect "

						"(connection refused) [0x%x].",

						program,status);

				return toks_get_driver_ctx_fail(meta);

			case NT_STATUS_ACCESS_DENIED:

				if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

					toks_dprintf(STDERR_FILENO,

						"%s: error: could not connect "

						"(access denied) [0x%x].",

						program,status);

				return toks_get_driver_ctx_fail(meta);

			default:

				if (flags & TOKS_DRIVER_VERBOSITY_ERRORS)

					toks_dprintf(STDERR_FILENO,

						"%s: error: could not connect "

						"(check the system's documentation) [0x%x].",

						program,status);

				return toks_get_driver_ctx_fail(meta);

		}

	}

	*pctx = &ctx->ctx;

	return TOKS_OK;

}

static void toks_free_driver_ctx_impl(struct toks_driver_ctx_alloc * ictx)

{

	if (ictx->ctx.hevent)

		ntapi->zw_close(ictx->ctx.hevent);

	if (ictx->ctx.hsvcdir)

		ntapi->zw_close(ictx->ctx.hsvcdir);

	if (ictx->ctx.hsvclink)

		ntapi->zw_close(ictx->ctx.hsvclink);

	if (ictx->ctx.hservice)

		ntapi->zw_close(ictx->ctx.hservice);

	if (ictx->ctx.tokens)

		toks_free(ictx->ctx.tokens);

	if (ictx->ctx.waiters)

		toks_free(ictx->ctx.waiters);

	argv_free(ictx->meta);

	free(ictx);

}

void toks_free_driver_ctx(struct toks_driver_ctx * ctx)

{

	struct toks_driver_ctx_alloc *	ictx;

	uintptr_t			addr;

	if (ctx) {

		addr = (uintptr_t)ctx - offsetof(struct toks_driver_ctx_impl,ctx);

		addr = addr - offsetof(struct toks_driver_ctx_alloc,ctx);

		ictx = (struct toks_driver_ctx_alloc *)addr;

		toks_free_driver_ctx_impl(ictx);

	}

}

void toks_driver_set_timeout(struct toks_driver_ctx * dctx, int64_t millisecs)

{

	toks_set_driver_timeout(dctx,millisecs);

}

void toks_driver_unset_timeout(struct toks_driver_ctx * dctx)

{

	toks_set_driver_timeout(dctx,(-1));

}

const struct toks_source_version * toks_source_version(void)

{

	return &toks_src_version;

}