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#define FUSE_USE_VERSION 26


#include <sys/types.h>
#include <pthread.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
................................................................................
		/* Unable to lookup user for some reason */
		/* Return an unprivileged user ID */
		return(1);
	}

	return(ctx->uid);
}

































/*
 * Look up the home directory for a given UID
 *        Returns a C string containing the user's home directory or NULL if
 *        the user's home directory does not exist or is not correctly
 *        configured
 */
................................................................................

/*
 * Tcl interface to get the home directory for the user making the "current"
 * FUSE I/O request
 */
static int tcl_appfs_get_homedir(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	char *homedir;





        if (objc != 1) {
                Tcl_WrongNumArgs(interp, 1, objv, NULL);
                return(TCL_ERROR);
        }










	homedir = appfs_get_homedir(appfs_get_fsuid());

	if (homedir == NULL) {
		return(TCL_ERROR);
	}

        Tcl_SetObjResult(interp, Tcl_NewStringObj(homedir, -1));

	free(homedir);









        return(TCL_OK);
}

/*
 * Generate an inode for a given path.  The inode should be computed in such
 * a way that it is unlikely to be duplicated and remains the same for a given
................................................................................

	stbuf->st_mtime = pathinfo.time;
	stbuf->st_ctime = pathinfo.time;
	stbuf->st_atime = pathinfo.time;
	stbuf->st_ino   = pathinfo.inode;
	stbuf->st_mode  = 0;
	stbuf->st_uid   = appfs_get_fsuid();


	switch (pathinfo.type) {
		case APPFS_PATHTYPE_DIRECTORY:
			stbuf->st_mode = S_IFDIR | 0555;
			stbuf->st_nlink = 2 + pathinfo.typeinfo.dir.childcount;
			break;
		case APPFS_PATHTYPE_FILE:
................................................................................
		return(-EISDIR);
	}

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}



	tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, mode);
	if (tcl_ret != TCL_OK) {


		APPFS_DEBUG("::appfs::openpath(%s, %s) failed.", path, mode);
		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));

		return(-EIO);
	}

	real_path = Tcl_GetStringResult(interp);
	if (real_path == NULL) {


		return(-EIO);
	}

	APPFS_DEBUG("Translated request to open %s to opening %s (mode = \"%s\")", path, real_path, mode);

	fh = open(real_path, fi->flags, 0600);



	if (fh < 0) {
		return(-EIO);
	}

	fi->fh = fh;

	return(0);
................................................................................
	if ((mode & S_IFCHR) == S_IFCHR) {
		return(-EPERM);
	}

	if ((mode & S_IFBLK) == S_IFBLK) {
		return(-EPERM);
	}



	real_path = appfs_prepare_to_create(path);
	if (real_path == NULL) {


		return(-EIO);
	}

	mknod_ret = mknod(real_path, mode, device);



	free(real_path);

	if (mknod_ret != 0) {
		return(errno * -1);
	}

................................................................................
	if ((mode & S_IFCHR) == S_IFCHR) {
		return(-EPERM);
	}

	if ((mode & S_IFBLK) == S_IFBLK) {
		return(-EPERM);
	}



	real_path = appfs_prepare_to_create(path);
	if (real_path == NULL) {


		return(-EIO);
	}

	fd = creat(real_path, mode);



	free(real_path);

	if (fd < 0) {
		return(errno * -1);
	}

................................................................................

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	real_path = appfs_localpath(path);
	if (real_path == NULL) {
		return(-EIO);
	}



	truncate_ret = truncate(real_path, size);



	free(real_path);

	if (truncate_ret != 0) {
		return(errno * -1);
	}

................................................................................

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}



	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::unlinkpath", path);



	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::unlinkpath(%s) failed.", path);
		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));

		return(-EIO);
	}

................................................................................
}

static int appfs_fuse_mkdir(const char *path, mode_t mode) {
	char *real_path;
	int mkdir_ret;

	APPFS_DEBUG("Enter (path = %s, ...)", path);



	real_path = appfs_prepare_to_create(path);
	if (real_path == NULL) {


		return(-EIO);
	}

	mkdir_ret = mkdir(real_path, mode);



	free(real_path);

	if (mkdir_ret != 0) {
		if (errno != EEXIST) {
			return(errno * -1);
		}
................................................................................

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}



	tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, "write");
	if (tcl_ret != TCL_OK) {


		APPFS_DEBUG("::appfs::openpath(%s, %s) failed.", path, "write");
		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));

		return(-EIO);
	}

	real_path = Tcl_GetStringResult(interp);
	if (real_path == NULL) {


		return(-EIO);
	}

	chmod_ret = chmod(real_path, mode);



	return(chmod_ret);
}

/*
 * SQLite3 mode: Execute raw SQL and return success or failure
 */


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#define FUSE_USE_VERSION 26

#include <sys/fsuid.h>
#include <sys/types.h>
#include <pthread.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
................................................................................
		/* Unable to lookup user for some reason */
		/* Return an unprivileged user ID */
		return(1);
	}

	return(ctx->uid);
}

/*
 * Determine the GID for the user making the current FUSE filesystem request.
 * This will be used to lookup the user's home directory so we can search for
 * locally modified files.
 */
static gid_t appfs_get_fsgid(void) {
	struct fuse_context *ctx;

	if (!appfs_fuse_started) {
		return(getgid());
	}

	ctx = fuse_get_context();
	if (ctx == NULL) {
		/* Unable to lookup user for some reason */
		/* Return an unprivileged user ID */
		return(1);
	}

	return(ctx->gid);
}

static void appfs_simulate_user_fs_enter(void) {
	setfsuid(appfs_get_fsuid());
	setfsgid(appfs_get_fsgid());
}

static void appfs_simulate_user_fs_leave(void) {
	setfsuid(0);
	setfsgid(0);
}

/*
 * Look up the home directory for a given UID
 *        Returns a C string containing the user's home directory or NULL if
 *        the user's home directory does not exist or is not correctly
 *        configured
 */
................................................................................

/*
 * Tcl interface to get the home directory for the user making the "current"
 * FUSE I/O request
 */
static int tcl_appfs_get_homedir(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	char *homedir;
	Tcl_Obj *homedir_obj;
	uid_t fsuid;
	static __thread Tcl_Obj *last_homedir_obj = NULL;
	static __thread uid_t last_fsuid = -1;

        if (objc != 1) {
                Tcl_WrongNumArgs(interp, 1, objv, NULL);
                return(TCL_ERROR);
        }

	fsuid = appfs_get_fsuid();

	if (fsuid == last_fsuid && last_homedir_obj != NULL) {
		homedir_obj = last_homedir_obj;
	} else {
		if (last_homedir_obj != NULL) {
			Tcl_DecrRefCount(last_homedir_obj);
		}

		homedir = appfs_get_homedir(appfs_get_fsuid());

		if (homedir == NULL) {
			return(TCL_ERROR);
		}

		homedir_obj = Tcl_NewStringObj(homedir, -1);

		free(homedir);

		last_homedir_obj = homedir_obj;
		last_fsuid = fsuid;

		Tcl_IncrRefCount(last_homedir_obj);
	}

       	Tcl_SetObjResult(interp, homedir_obj);

        return(TCL_OK);
}

/*
 * Generate an inode for a given path.  The inode should be computed in such
 * a way that it is unlikely to be duplicated and remains the same for a given
................................................................................

	stbuf->st_mtime = pathinfo.time;
	stbuf->st_ctime = pathinfo.time;
	stbuf->st_atime = pathinfo.time;
	stbuf->st_ino   = pathinfo.inode;
	stbuf->st_mode  = 0;
	stbuf->st_uid   = appfs_get_fsuid();
	stbuf->st_gid   = appfs_get_fsgid();

	switch (pathinfo.type) {
		case APPFS_PATHTYPE_DIRECTORY:
			stbuf->st_mode = S_IFDIR | 0555;
			stbuf->st_nlink = 2 + pathinfo.typeinfo.dir.childcount;
			break;
		case APPFS_PATHTYPE_FILE:
................................................................................
		return(-EISDIR);
	}

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	appfs_simulate_user_fs_enter();

	tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, mode);
	if (tcl_ret != TCL_OK) {
		appfs_simulate_user_fs_leave();

		APPFS_DEBUG("::appfs::openpath(%s, %s) failed.", path, mode);
		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));

		return(-EIO);
	}

	real_path = Tcl_GetStringResult(interp);
	if (real_path == NULL) {
		appfs_simulate_user_fs_leave();

		return(-EIO);
	}

	APPFS_DEBUG("Translated request to open %s to opening %s (mode = \"%s\")", path, real_path, mode);

	fh = open(real_path, fi->flags, 0600);

	appfs_simulate_user_fs_leave();

	if (fh < 0) {
		return(-EIO);
	}

	fi->fh = fh;

	return(0);
................................................................................
	if ((mode & S_IFCHR) == S_IFCHR) {
		return(-EPERM);
	}

	if ((mode & S_IFBLK) == S_IFBLK) {
		return(-EPERM);
	}

	appfs_simulate_user_fs_enter();

	real_path = appfs_prepare_to_create(path);
	if (real_path == NULL) {
		appfs_simulate_user_fs_leave();

		return(-EIO);
	}

	mknod_ret = mknod(real_path, mode, device);

	appfs_simulate_user_fs_leave();

	free(real_path);

	if (mknod_ret != 0) {
		return(errno * -1);
	}

................................................................................
	if ((mode & S_IFCHR) == S_IFCHR) {
		return(-EPERM);
	}

	if ((mode & S_IFBLK) == S_IFBLK) {
		return(-EPERM);
	}

	appfs_simulate_user_fs_enter();

	real_path = appfs_prepare_to_create(path);
	if (real_path == NULL) {
		appfs_simulate_user_fs_leave();

		return(-EIO);
	}

	fd = creat(real_path, mode);

	appfs_simulate_user_fs_leave();

	free(real_path);

	if (fd < 0) {
		return(errno * -1);
	}

................................................................................

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	real_path = appfs_localpath(path);
	if (real_path == NULL) {
		return(-EIO);
	}

	appfs_simulate_user_fs_enter();

	truncate_ret = truncate(real_path, size);

	appfs_simulate_user_fs_leave();

	free(real_path);

	if (truncate_ret != 0) {
		return(errno * -1);
	}

................................................................................

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	appfs_simulate_user_fs_enter();

	tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::unlinkpath", path);

	appfs_simulate_user_fs_leave();

	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("::appfs::unlinkpath(%s) failed.", path);
		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));

		return(-EIO);
	}

................................................................................
}

static int appfs_fuse_mkdir(const char *path, mode_t mode) {
	char *real_path;
	int mkdir_ret;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	appfs_simulate_user_fs_enter();

	real_path = appfs_prepare_to_create(path);
	if (real_path == NULL) {
		appfs_simulate_user_fs_leave();

		return(-EIO);
	}

	mkdir_ret = mkdir(real_path, mode);

	appfs_simulate_user_fs_leave();

	free(real_path);

	if (mkdir_ret != 0) {
		if (errno != EEXIST) {
			return(errno * -1);
		}
................................................................................

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	interp = appfs_TclInterp();
	if (interp == NULL) {
		return(-EIO);
	}

	appfs_simulate_user_fs_enter();

	tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::openpath", path, "write");
	if (tcl_ret != TCL_OK) {
		appfs_simulate_user_fs_leave();

		APPFS_DEBUG("::appfs::openpath(%s, %s) failed.", path, "write");
		APPFS_DEBUG("Tcl Error is: %s", Tcl_GetStringResult(interp));

		return(-EIO);
	}

	real_path = Tcl_GetStringResult(interp);
	if (real_path == NULL) {
		appfs_simulate_user_fs_leave();

		return(-EIO);
	}

	chmod_ret = chmod(real_path, mode);

	appfs_simulate_user_fs_leave();

	return(chmod_ret);
}

/*
 * SQLite3 mode: Execute raw SQL and return success or failure
 */