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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>
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/* 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
*/
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/*
* 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());
homedir = appfs_get_homedir(appfs_get_fsuid());
if (homedir == NULL) {
return(TCL_ERROR);
}
if (homedir == NULL) {
return(TCL_ERROR);
}
Tcl_SetObjResult(interp, Tcl_NewStringObj(homedir, -1));
free(homedir);
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
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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:
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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);
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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);
}
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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);
}
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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);
}
return(0);
}
static int appfs_fuse_unlink_rmdir(const char *path) {
Tcl_Interp *interp;
int tcl_ret;
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);
}
return(0);
}
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);
}
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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
*/
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