#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>
#include <fcntl.h>
#include <stdio.h>
#include <fuse.h>
#include <pwd.h>
#include <tcl.h>
/* From sha1.c */
int Sha1_Init(Tcl_Interp *interp);
#ifndef APPFS_CACHEDIR
#define APPFS_CACHEDIR "/var/cache/appfs"
#endif
#ifdef DEBUG
#define APPFS_DEBUG(x...) { fprintf(stderr, "[debug] %s:%i:%s: ", __FILE__, __LINE__, __func__); fprintf(stderr, x); fprintf(stderr, "\n"); }
#else
#define APPFS_DEBUG(x...) /**/
#endif
static pthread_key_t interpKey;
struct appfs_thread_data {
const char *cachedir;
time_t boottime;
struct {
int writable;
} options;
};
struct appfs_thread_data globalThread;
typedef enum {
APPFS_PATHTYPE_INVALID,
APPFS_PATHTYPE_FILE,
APPFS_PATHTYPE_DIRECTORY,
APPFS_PATHTYPE_SYMLINK
} appfs_pathtype_t;
struct appfs_children {
struct appfs_children *_next;
int counter;
char name[256];
};
struct appfs_pathinfo {
appfs_pathtype_t type;
time_t time;
char hostname[256];
int packaged;
unsigned long long inode;
union {
struct {
int childcount;
} dir;
struct {
int executable;
off_t size;
} file;
struct {
off_t size;
char source[256];
} symlink;
} typeinfo;
};
static Tcl_Interp *appfs_create_TclInterp(void) {
Tcl_Interp *interp;
const char *cachedir = globalThread.cachedir;
int tcl_ret;
APPFS_DEBUG("Creating new Tcl interpreter for TID = 0x%llx", (unsigned long long) pthread_self());
interp = Tcl_CreateInterp();
if (interp == NULL) {
fprintf(stderr, "Unable to create Tcl Interpreter. Aborting.\n");
return(NULL);
}
tcl_ret = Tcl_Init(interp);
if (tcl_ret != TCL_OK) {
fprintf(stderr, "Unable to initialize Tcl. Aborting.\n");
fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
Tcl_DeleteInterp(interp);
return(NULL);
}
tcl_ret = Tcl_Eval(interp, "package ifneeded sha1 1.0 [list load {} sha1]");
if (tcl_ret != TCL_OK) {
fprintf(stderr, "Unable to initialize Tcl SHA1. Aborting.\n");
fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
Tcl_DeleteInterp(interp);
return(NULL);
}
tcl_ret = Tcl_Eval(interp, "package ifneeded appfsd 1.0 [list load {} appfsd]");
if (tcl_ret != TCL_OK) {
fprintf(stderr, "Unable to initialize Tcl AppFS Package. Aborting.\n");
fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
Tcl_DeleteInterp(interp);
return(NULL);
}
tcl_ret = Tcl_Eval(interp, ""
#include "appfsd.tcl.h"
"");
if (tcl_ret != TCL_OK) {
fprintf(stderr, "Unable to initialize Tcl AppFS script. Aborting.\n");
fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
Tcl_DeleteInterp(interp);
return(NULL);
}
if (Tcl_SetVar(interp, "::appfs::cachedir", cachedir, TCL_GLOBAL_ONLY) == NULL) {
fprintf(stderr, "Unable to set cache directory. This should never fail.\n");
Tcl_DeleteInterp(interp);
return(NULL);
}
tcl_ret = Tcl_Eval(interp, "::appfs::init");
if (tcl_ret != TCL_OK) {
fprintf(stderr, "Unable to initialize Tcl AppFS script (::appfs::init). Aborting.\n");
fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));
Tcl_DeleteInterp(interp);
return(NULL);
}
Tcl_HideCommand(interp, "auto_load_index", "auto_load_index");
Tcl_HideCommand(interp, "unknown", "unknown");
return(interp);
}
static Tcl_Interp *appfs_TclInterp(void) {
Tcl_Interp *interp;
interp = pthread_getspecific(interpKey);
if (interp == NULL) {
interp = appfs_create_TclInterp();
if (interp == NULL) {
return(NULL);
}
pthread_setspecific(interpKey, interp);
}
return(interp);
}
static int appfs_Tcl_Eval(Tcl_Interp *interp, int objc, const char *cmd, ...) {
Tcl_Obj **objv;
const char *arg;
va_list argp;
int retval;
int i;
if (interp == NULL) {
return(TCL_ERROR);
}
objv = (void *) ckalloc(sizeof(*objv) * objc);
objv[0] = Tcl_NewStringObj(cmd, -1);
Tcl_IncrRefCount(objv[0]);
va_start(argp, cmd);
for (i = 1; i < objc; i++) {
arg = va_arg(argp, const char *);
objv[i] = Tcl_NewStringObj(arg, -1);
Tcl_IncrRefCount(objv[i]);
}
va_end(argp);
retval = Tcl_EvalObjv(interp, objc, objv, 0);
for (i = 0; i < objc; i++) {
Tcl_DecrRefCount(objv[i]);
}
ckfree((void *) objv);
if (retval != TCL_OK) {
APPFS_DEBUG("Tcl command failed, ::errorInfo contains: %s\n", Tcl_GetVar(interp, "::errorInfo", 0));
}
return(retval);
}
static void appfs_update_index(const char *hostname) {
Tcl_Interp *interp;
int tcl_ret;
APPFS_DEBUG("Enter: hostname = %s", hostname);
interp = appfs_TclInterp();
if (interp == NULL) {
return;
}
tcl_ret = appfs_Tcl_Eval(interp, 2, "::appfs::getindex", hostname);
if (tcl_ret != TCL_OK) {
APPFS_DEBUG("Call to ::appfs::getindex failed: %s", Tcl_GetStringResult(interp));
return;
}
return;
}
static const char *appfs_getfile(const char *hostname, const char *sha1) {
Tcl_Interp *interp;
char *retval;
int tcl_ret;
interp = appfs_TclInterp();
if (interp == NULL) {
return(NULL);
}
tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::download", hostname, sha1);
if (tcl_ret != TCL_OK) {
APPFS_DEBUG("Call to ::appfs::download failed: %s", Tcl_GetStringResult(interp));
return(NULL);
}
retval = strdup(Tcl_GetStringResult(interp));
return(retval);
}
static void appfs_update_manifest(const char *hostname, const char *sha1) {
Tcl_Interp *interp;
int tcl_ret;
interp = appfs_TclInterp();
if (interp == NULL) {
return;
}
tcl_ret = appfs_Tcl_Eval(interp, 3, "::appfs::getpkgmanifest", hostname, sha1);
if (tcl_ret != TCL_OK) {
APPFS_DEBUG("Call to ::appfs::getpkgmanifest failed: %s", Tcl_GetStringResult(interp));
return;
}
return;
}
static uid_t appfs_get_fsuid(void) {
struct fuse_context *ctx;
ctx = fuse_get_context();
if (ctx == NULL) {
/* Unable to lookup user for some reason */
/* Return an unprivileged user ID */
return(1);
}
return(ctx->uid);
}
static char *appfs_get_homedir(uid_t fsuid) {
struct passwd entry, *result;
struct stat stbuf;
char buf[1024], *retval;
int gpu_ret, stat_ret;
gpu_ret = getpwuid_r(fsuid, &entry, buf, sizeof(buf), &result);
if (gpu_ret != 0) {
APPFS_DEBUG("getpwuid_r(%llu, ...) returned in failure", (unsigned long long) fsuid);
return(NULL);
}
if (result == NULL) {
APPFS_DEBUG("getpwuid_r(%llu, ...) returned NULL result", (unsigned long long) fsuid);
return(NULL);
}
if (result->pw_dir == NULL) {
APPFS_DEBUG("getpwuid_r(%llu, ...) returned NULL home directory", (unsigned long long) fsuid);
return(NULL);
}
stat_ret = stat(result->pw_dir, &stbuf);
if (stat_ret != 0) {
APPFS_DEBUG("stat(%s) returned in failure", result->pw_dir);
return(NULL);
}
if (stbuf.st_uid != fsuid) {
APPFS_DEBUG("UID mis-match on user %llu's home directory (%s). It's owned by %llu.",
(unsigned long long) fsuid,
result->pw_dir,
(unsigned long long) stbuf.st_uid
);
return(NULL);
}
retval = strdup(result->pw_dir);
return(retval);
}
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 */
static long long appfs_get_path_inode(const char *path) {
long long retval;
const char *p;
retval = 10;
for (p = path; *p; p++) {
retval %= 4290960290ULL;
retval += *p;
retval <<= 7;
}
retval += 10;
retval %= 4294967296ULL;
return(retval);
}
/* Get information about a path, and optionally list children */
static int appfs_get_path_info(const char *_path, struct appfs_pathinfo *pathinfo, struct appfs_children **children) {
}
static int appfs_fuse_readlink(const char *path, char *buf, size_t size) {
struct appfs_pathinfo pathinfo;
int res = 0;
APPFS_DEBUG("Enter (path = %s, ...)", path);
pathinfo.type = APPFS_PATHTYPE_INVALID;
res = appfs_get_path_info(path, &pathinfo, NULL);
if (res != 0) {
return(res);
}
if (pathinfo.type != APPFS_PATHTYPE_SYMLINK) {
return(-EINVAL);
}
if ((strlen(pathinfo.typeinfo.symlink.source) + 1) > size) {
return(-ENAMETOOLONG);
}
memcpy(buf, pathinfo.typeinfo.symlink.source, strlen(pathinfo.typeinfo.symlink.source) + 1);
return(0);
}
static int appfs_fuse_getattr(const char *path, struct stat *stbuf) {
struct appfs_pathinfo pathinfo;
int res = 0;
APPFS_DEBUG("Enter (path = %s, ...)", path);
pathinfo.type = APPFS_PATHTYPE_INVALID;
res = appfs_get_path_info(path, &pathinfo, NULL);
if (res != 0) {
return(res);
}
memset(stbuf, 0, sizeof(struct stat));
stbuf->st_mtime = pathinfo.time;
stbuf->st_ctime = pathinfo.time;
stbuf->st_atime = pathinfo.time;
stbuf->st_ino = pathinfo.inode;
stbuf->st_mode = 0;
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:
if (pathinfo.typeinfo.file.executable) {
stbuf->st_mode = S_IFREG | 0555;
} else {
stbuf->st_mode = S_IFREG | 0444;
}
stbuf->st_nlink = 1;
stbuf->st_size = pathinfo.typeinfo.file.size;
break;
case APPFS_PATHTYPE_SYMLINK:
stbuf->st_mode = S_IFLNK | 0555;
stbuf->st_nlink = 1;
stbuf->st_size = pathinfo.typeinfo.symlink.size;
break;
case APPFS_PATHTYPE_INVALID:
res = -EIO;
break;
}
if (pathinfo.packaged) {
if (globalThread.options.writable) {
stbuf->st_mode |= 0222;
}
}
return res;
}
static int appfs_fuse_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi) {
struct appfs_pathinfo pathinfo;
struct appfs_children *children, *child;
int retval;
APPFS_DEBUG("Enter (path = %s, ...)", path);
retval = appfs_get_path_info(path, &pathinfo, &children);
if (retval != 0) {
return(retval);
}
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
for (child = children; child; child = child->_next) {
filler(buf, child->name, NULL, 0);
}
// appfs_free_list_children(children);
return(0);
}
static int appfs_fuse_open(const char *path, struct fuse_file_info *fi) {
struct appfs_pathinfo pathinfo;
const char *real_path;
int fh;
int gpi_ret;
APPFS_DEBUG("Enter (path = %s, ...)", path);
#if 0
if ((fi->flags & 3) != O_RDONLY) {
return(-EACCES);
}
gpi_ret = appfs_get_path_info(path, &pathinfo, NULL);
if (gpi_ret != 0) {
return(gpi_ret);
}
if (pathinfo.type == APPFS_PATHTYPE_DIRECTORY) {
return(-EISDIR);
}
real_path = appfs_getfile(pathinfo.hostname, pathinfo.typeinfo.file.sha1);
if (real_path == NULL) {
return(-EIO);
}
fh = open(real_path, O_RDONLY);
free((void *) real_path);
if (fh < 0) {
return(-EIO);
}
fi->fh = fh;
#endif
return(0);
}
static int appfs_fuse_close(const char *path, struct fuse_file_info *fi) {
int close_ret;
close_ret = close(fi->fh);
if (close_ret != 0) {
return(-EIO);
}
return(0);
}
static int appfs_fuse_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) {
off_t lseek_ret;
ssize_t read_ret;
APPFS_DEBUG("Enter (path = %s, ...)", path);
lseek_ret = lseek(fi->fh, offset, SEEK_SET);
if (lseek_ret != offset) {
return(-EIO);
}
read_ret = read(fi->fh, buf, size);
return(read_ret);
}
static int appfs_sqlite3(const char *sql) {
Tcl_Interp *interp;
const char *sql_ret;
int tcl_ret;
interp = appfs_create_TclInterp();
if (interp == NULL) {
fprintf(stderr, "Unable to create a Tcl interpreter. Aborting.\n");
return(1);
}
tcl_ret = appfs_Tcl_Eval(interp, 5, "::appfs::db", "eval", sql, "row", "unset -nocomplain row(*); parray row; puts \"----\"");
sql_ret = Tcl_GetStringResult(interp);
if (tcl_ret != TCL_OK) {
fprintf(stderr, "[error] %s\n", sql_ret);
return(1);
}
if (sql_ret && sql_ret[0] != '\0') {
printf("%s\n", sql_ret);
}
return(0);
}
static int appfs_tcl(const char *tcl) {
Tcl_Interp *interp;
const char *tcl_result;
int tcl_ret;
interp = appfs_create_TclInterp();
if (interp == NULL) {
fprintf(stderr, "Unable to create a Tcl interpreter. Aborting.\n");
return(1);
}
tcl_ret = Tcl_Eval(interp, tcl);
tcl_result = Tcl_GetStringResult(interp);
if (tcl_ret != TCL_OK) {
fprintf(stderr, "[error] %s\n", tcl_result);
return(1);
}
if (tcl_result && tcl_result[0] != '\0') {
printf("%s\n", tcl_result);
}
return(0);
}
static int Appfsd_Init(Tcl_Interp *interp) {
#ifdef USE_TCL_STUBS
if (Tcl_InitStubs(interp, TCL_VERSION, 0) == 0L) {
return(TCL_ERROR);
}
#endif
Tcl_CreateObjCommand(interp, "appfsd::get_homedir", tcl_appfs_get_homedir, NULL, NULL);
Tcl_PkgProvide(interp, "appfsd", "1.0");
return(TCL_OK);
}
static struct fuse_operations appfs_oper = {
.getattr = appfs_fuse_getattr,
.readdir = appfs_fuse_readdir,
.readlink = appfs_fuse_readlink,
.open = appfs_fuse_open,
.release = appfs_fuse_close,
.read = appfs_fuse_read
};
int main(int argc, char **argv) {
const char *cachedir = APPFS_CACHEDIR;
int pthread_ret;
globalThread.cachedir = cachedir;
globalThread.boottime = time(NULL);
globalThread.options.writable = 1;
Tcl_StaticPackage(NULL, "sha1", Sha1_Init, NULL);
Tcl_StaticPackage(NULL, "appfsd", Appfsd_Init, NULL);
pthread_ret = pthread_key_create(&interpKey, NULL);
if (pthread_ret != 0) {
fprintf(stderr, "Unable to create TSD key for Tcl. Aborting.\n");
return(1);
}
if (argc == 3 && strcmp(argv[1], "-sqlite3") == 0) {
return(appfs_sqlite3(argv[2]));
}
if (argc == 3 && strcmp(argv[1], "-tcl") == 0) {
return(appfs_tcl(argv[2]));
}
return(fuse_main(argc, argv, &appfs_oper, NULL));
}