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rockbox/firmware/target/hosted/filesystem-app.c
Solomon Peachy db6f21e295 hosted: sanitize handling of HOME_DIR 
* HOME_DIR is now either "/" or special "<HOME>"
   * target-specific "home dir path" is defined solely by PIVOT_ROOT
 * PIVOT_ROOT path is now defined in toplevel config files
 * Make Samsung YP-R0/R1 and SONY_NWZ use PIVOT_ROOT too
 * Do not prepend PIVOT_ROOT path if the path already has it!
 * Do not play these games for __PCTOOL__ builds

Change-Id: I3d51ad902a5f9cafe45ba15ba654f30f1ec6113a
2020-10-11 17:47:34 -04:00

585 lines
16 KiB
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 Thomas Martitz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#define RB_FILESYSTEM_OS
#include <stdio.h> /* snprintf */
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include "config.h"
#include "system.h"
#include "file.h"
#include "dir.h"
#include "file_internal.h"
#include "pathfuncs.h"
#include "string-extra.h"
#include "rbpaths.h"
#include "logf.h"
/* PIVOT_ROOT adds a fixed prefix to all paths */
#if defined(BOOTLOADER) || defined(CHECKWPS) || defined(SIMULATOR) || defined(__PCTOOL__)
/* We don't want to use pivot root on these! */
#undef PIVOT_ROOT
#endif
#if defined(HAVE_MULTIDRIVE) || defined(HAVE_SPECIAL_DIRS)
#if (CONFIG_PLATFORM & PLATFORM_ANDROID)
static const char rbhome[] = "/sdcard";
#elif (CONFIG_PLATFORM & (PLATFORM_SDL|PLATFORM_MAEMO|PLATFORM_PANDORA)) \
&& !defined(__PCTOOL__)
static const char *rbhome;
#else
/* YPR0, YPR1, NWZ, etc */
static const char rbhome[] = HOME_DIR;
#endif
#endif
#if !defined(__PCTOOL__)
/* We don't want this for tools */
#undef HAVE_SPECIAL_DIRS
#endif
#ifdef HAVE_MULTIDRIVE
/* This is to compare any opened directories with the home directory so that
the special drive links may be returned for it only */
static int rbhome_fildes = -1;
/* A special link is created under e.g. HOME_DIR/<microSD1>, e.g. to access
* external storage in a convenient location, much similar to the mount
* point on our native targets. Here they are treated as symlink (one which
* doesn't actually exist in the filesystem and therefore we have to override
* readlink() */
static const char *handle_special_links(const char* link, unsigned flags,
char *buf, const size_t bufsize)
{
(void) flags;
char vol_string[VOL_MAX_LEN + 1];
int len;
for (int i = 1; i < NUM_VOLUMES; i++)
{
len = get_volume_name(i, vol_string);
/* link might be passed with or without HOME_DIR expanded. To handle
* both perform substring matching (VOL_NAMES is unique enough) */
const char *begin = strstr(link, vol_string);
if (begin)
{
/* begin now points to the start of vol_string within link,
* we want to copy the remainder of the paths, prefixed by
* the actual mount point (the remainder might be "") */
snprintf(buf, bufsize, MULTIDRIVE_DIR"%s", begin + len);
return buf;
}
}
return link;
}
#endif
#ifdef HAVE_MULTIDRIVE
/* we keep an open descriptor of the home directory to detect when it has been
opened by opendir() so that its "symlinks" may be enumerated */
static void cleanup_rbhome(void)
{
os_close(rbhome_fildes);
rbhome_fildes = -1;
}
#endif /* HAVE_MULTIDRIVE */
void paths_init(void)
{
#ifdef HAVE_SPECIAL_DIRS
/* make sure $HOME/.config/rockbox.org exists, it's needed for config.cfg */
#if (CONFIG_PLATFORM & PLATFORM_ANDROID)
os_mkdir("/sdcard/rockbox" __MKDIR_MODE_ARG);
os_mkdir("/sdcard/rockbox/rocks.data" __MKDIR_MODE_ARG);
os_mkdir("/sdcard/rockbox/eqs" __MKDIR_MODE_ARG);
#else
char config_dir[MAX_PATH];
const char *home = getenv("RBROOT");
if (!home)
{
home = getenv("HOME");
}
if (!home)
{
logf("HOME environment var not set. Can't write config");
return;
}
rbhome = home;
snprintf(config_dir, sizeof(config_dir), "%s/.config", home);
os_mkdir(config_dir __MKDIR_MODE_ARG);
snprintf(config_dir, sizeof(config_dir), "%s/.config/rockbox.org", home);
os_mkdir(config_dir __MKDIR_MODE_ARG);
/* Plugin data directory */
snprintf(config_dir, sizeof(config_dir), "%s/.config/rockbox.org/rocks.data", home);
os_mkdir(config_dir __MKDIR_MODE_ARG);
#endif
#endif /* HAVE_SPECIAL_DIRS */
#ifdef HAVE_MULTIDRIVE
/* if this fails then alternate volumes will not work, but this function
cannot return that fact */
rbhome_fildes = os_opendirfd(rbhome);
if (rbhome_fildes >= 0)
atexit(cleanup_rbhome);
#endif /* HAVE_MULTIDRIVE */
}
#ifdef HAVE_SPECIAL_DIRS
static const char* _get_user_file_path(const char *path,
unsigned flags,
char* buf,
const size_t bufsize)
{
const char *ret = path;
const char *pos = path;
/* replace ROCKBOX_DIR in path with $HOME/.config/rockbox.org */
pos += ROCKBOX_DIR_LEN;
if (*pos == '/') pos += 1;
#if (CONFIG_PLATFORM & PLATFORM_ANDROID)
if (path_append(buf, "/sdcard/rockbox", pos, bufsize) >= bufsize)
return NULL;
#else
if (path_append(buf, rbhome, ".config/rockbox.org", bufsize) >= bufsize ||
path_append(buf, PA_SEP_SOFT, pos, bufsize) >= bufsize)
return NULL;
#endif
/* always return the replacement buffer (pointing to $HOME) if
* write access is needed */
if (flags & NEED_WRITE)
ret = buf;
else if (os_file_exists(buf))
ret = buf;
if (ret != buf) /* not found in $HOME, try ROCKBOX_BASE_DIR, !NEED_WRITE only */
{
if (path_append(buf, ROCKBOX_SHARE_PATH, pos, bufsize) >= bufsize)
return NULL;
if (os_file_exists(buf))
ret = buf;
}
return ret;
}
#endif
const char * handle_special_dirs(const char *dir, unsigned flags,
char *buf, const size_t bufsize)
{
(void) flags; (void) buf; (void) bufsize;
#ifdef HAVE_SPECIAL_DIRS
#define HOME_DIR_LEN (sizeof(HOME_DIR)-1)
/* This replaces HOME_DIR (ie '<HOME'>') with runtime rbhome */
if (!strncmp(HOME_DIR, dir, HOME_DIR_LEN))
{
const char *p = dir + HOME_DIR_LEN;
while (*p == '/') p++;
snprintf(buf, bufsize, "%s/%s", rbhome, p);
dir = buf;
}
else if (!strncmp(ROCKBOX_DIR, dir, ROCKBOX_DIR_LEN))
dir = _get_user_file_path(dir, flags, buf, bufsize);
#endif
#ifdef HAVE_MULTIDRIVE
dir = handle_special_links(dir, flags, buf, bufsize);
#endif
#ifdef PIVOT_ROOT
#define PIVOT_ROOT_LEN (sizeof(PIVOT_ROOT)-1)
/* Prepend root prefix to find actual path */
if (strncmp(PIVOT_ROOT, dir, PIVOT_ROOT_LEN))
{
snprintf(buf, bufsize, "%s/%s", PIVOT_ROOT, dir);
dir = buf;
}
#endif
return dir;
}
int app_open(const char *path, int oflag, ...)
{
int flags = IS_FILE;
if (oflag & O_ACCMODE)
flags |= NEED_WRITE;
char realpath[MAX_PATH];
const char *fpath = handle_special_dirs(path, flags, realpath,
sizeof (realpath));
if (!fpath)
FILE_ERROR_RETURN(ENAMETOOLONG, -1);
oflag |= O_CLOEXEC;
return os_open(fpath, oflag __OPEN_MODE_ARG);
}
int app_creat(const char *path, mode_t mode)
{
return app_open(path, O_CREAT|O_WRONLY|O_TRUNC, mode);
}
int app_remove(const char *path)
{
char realpath[MAX_PATH];
const char *fpath = handle_special_dirs(path, NEED_WRITE, realpath,
sizeof (realpath));
if (!fpath)
FILE_ERROR_RETURN(ENAMETOOLONG, -1);
return os_remove(fpath);
}
int app_rename(const char *old, const char *new)
{
char realpath_old[MAX_PATH], realpath_new[MAX_PATH];
const char *fold = handle_special_dirs(old, NEED_WRITE, realpath_old,
sizeof (realpath_old));
const char *fnew = handle_special_dirs(new, NEED_WRITE, realpath_new,
sizeof (realpath_new));
if (!fold || !fnew)
FILE_ERROR_RETURN(ENAMETOOLONG, -1);
return os_rename(fold, fnew);
}
#ifdef HAVE_SDL_THREADS
ssize_t app_read(int fd, void *buf, size_t nbyte)
{
return os_read(fd, buf, nbyte);
}
ssize_t app_write(int fd, const void *buf, size_t nbyte)
{
return os_write(fd, buf, nbyte);
}
#endif /* HAVE_SDL_THREADS */
int app_relate(const char *path1, const char *path2)
{
char realpath_1[MAX_PATH], realpath_2[MAX_PATH];
const char *fpath1 = handle_special_dirs(path1, 0, realpath_1,
sizeof (realpath_1));
const char *fpath2 = handle_special_dirs(path2, 0, realpath_2,
sizeof (realpath_2));
if (!fpath1 || !fpath2)
FILE_ERROR_RETURN(ENAMETOOLONG, -1);
return os_relate(fpath1, fpath2);
}
bool app_file_exists(const char *path)
{
char realpath[MAX_PATH];
const char *fpath = handle_special_dirs(path, NEED_WRITE, realpath,
sizeof (realpath));
if (!fpath)
FILE_ERROR_RETURN(ENAMETOOLONG, false);
return os_file_exists(fpath);
}
/* need to wrap around DIR* because we need to save the parent's directory
* path in order to determine dirinfo for volumes or convert the path to UTF-8;
* also is required to implement get_dir_info() */
struct __dir
{
OS_DIR_T *osdirp;
#ifdef HAVE_MULTIDRIVE
int volumes_returned;
#endif
int osfd;
bool osfd_is_opened;
#if defined(OS_DIRENT_CONVERT) || defined (HAVE_MULTIDRIVE)
#define USE_DIRENTP
struct dirent *direntp;
size_t d_name_size;
#endif
char path[];
};
static void __dir_free(struct __dir *this)
{
if (!this)
return;
#ifdef USE_DIRENTP
free(this->direntp);
#endif
if (this->osfd_is_opened)
os_close(this->osfd);
free(this);
}
DIR * app_opendir(const char *dirname)
{
int rc;
char realpath[MAX_PATH];
const char *fname = handle_special_dirs(dirname, 0, realpath,
sizeof (realpath));
if (!fname)
FILE_ERROR_RETURN(ENAMETOOLONG, NULL);
size_t name_len = path_strip_trailing_separators(fname, &fname);
struct __dir *this = calloc(1, sizeof (*this) + name_len + 1);
if (!this)
FILE_ERROR(ENOMEM, RC);
#ifdef USE_DIRENTP
/* allocate what we're really going to return to callers, making certain
it has at least the d_name size we want */
this->d_name_size = MAX(MAX_PATH, sizeof (this->direntp->d_name));
this->direntp = calloc(1, offsetof(typeof (*this->direntp), d_name) +
this->d_name_size);
if (!this->direntp)
FILE_ERROR(ENOMEM, RC);
/* only the d_name field will be valid but that is all that anyone may
truely count on portably existing */
#endif /* USE_DIRENTP */
strmemcpy(this->path, fname, name_len);
rc = os_opendir_and_fd(this->path, &this->osdirp, &this->osfd);
if (rc < 0)
FILE_ERROR(ERRNO, RC);
this->osfd_is_opened = rc > 0;
#ifdef HAVE_MULTIDRIVE
this->volumes_returned = INT_MAX; /* assume NOT $HOME */
if (rbhome_fildes >= 0 && os_fsamefile(rbhome_fildes, this->osfd) > 0)
this->volumes_returned = 0; /* there's no place like $HOME */
#endif /* HAVE_MULTIDRIVE */
return (DIR *)this;
file_error:
__dir_free(this);
return NULL;
}
int app_closedir(DIR *dirp)
{
struct __dir *this = (struct __dir *)dirp;
if (!this)
FILE_ERROR_RETURN(EBADF, -1);
OS_DIR_T *osdirp = this->osdirp;
__dir_free(this);
return os_closedir(osdirp);
}
struct dirent * app_readdir(DIR *dirp)
{
struct __dir *this = (struct __dir *)dirp;
if (!this)
FILE_ERROR_RETURN(EBADF, NULL);
#ifdef HAVE_MULTIDRIVE
if (this->volumes_returned < NUM_VOLUMES)
{
while (++this->volumes_returned < NUM_VOLUMES)
{
if (!volume_present(this->volumes_returned))
continue;
get_volume_name(this->volumes_returned, this->direntp->d_name);
return this->direntp;
}
}
/* do normal directory reads */
#endif /* HAVE_MULTIDRIVE */
OS_DIRENT_T *osdirent = os_readdir(this->osdirp);
#ifdef OS_DIRENT_CONVERT
if (strlcpy_from_os(this->direntp->d_name, osdirent->d_name,
this->d_name_size) >= this->d_name_size)
{
this->direntp->d_name[0] = '\0';
errno = EOVERFLOW;
return NULL;
}
osdirent = (OS_DIRENT_T *)this->direntp;
#endif /* OS_DIRENT_CONVERT */
return (struct dirent *)osdirent;
}
int app_mkdir(const char *path)
{
char realpath[MAX_PATH];
const char *fname = handle_special_dirs(path, NEED_WRITE, realpath,
sizeof (realpath));
if (!fname)
FILE_ERROR_RETURN(ENAMETOOLONG, -1);
return os_mkdir(fname __MKDIR_MODE_ARG);
}
int app_rmdir(const char *path)
{
char realpath[MAX_PATH];
const char *fname = handle_special_dirs(path, NEED_WRITE, realpath,
sizeof (realpath));
if (!fname)
FILE_ERROR_RETURN(ENAMETOOLONG, -1);
return os_rmdir(fname);
}
int app_samedir(DIR *dirp1, DIR *dirp2)
{
struct __dir *this1 = (struct __dir *)dirp1;
struct __dir *this2 = (struct __dir *)dirp2;
if (!this1 || !this2)
{
errno = EBADF;
return -1;
}
return os_fsamefile(this1->osfd, this2->osfd);
}
bool app_dir_exists(const char *dirname)
{
char realpath[MAX_PATH];
const char *fname = handle_special_dirs(dirname, 0, realpath,
sizeof (realpath));
if (!fname)
FILE_ERROR_RETURN(ENAMETOOLONG, false);
OS_DIR_T *osdirp = os_opendir(fname);
if (!osdirp)
return false;
os_closedir(osdirp);
return true;
}
struct dirinfo dir_get_info(DIR *dirp, struct dirent *entry)
{
struct __dir *this = (struct __dir *)dirp;
struct dirinfo ret = { .attribute = 0,
.mtime = 0 };
if (!this)
FILE_ERROR_RETURN(EBADF, ret);
if (!entry || entry->d_name[0] == '\0')
FILE_ERROR_RETURN(ENOENT, ret);
char path[MAX_PATH];
#ifdef HAVE_MULTIDRIVE
if (this->volumes_returned < NUM_VOLUMES)
{
/* last thing read was a "symlink" */
ret.attribute = ATTR_LINK;
strcpy(path, MULTIDRIVE_DIR);
}
else
#endif
if (path_append(path, this->path, entry->d_name, sizeof (path))
>= sizeof (path))
{
FILE_ERROR_RETURN(ENAMETOOLONG, ret);
}
struct stat s;
if (os_lstat(path, &s) < 0)
FILE_ERROR_RETURN(ERRNO, ret);
int err = 0;
if (S_ISLNK(s.st_mode))
{
ret.attribute |= ATTR_LINK;
err = os_stat(path, &s);
}
if (err < 0)
FILE_ERROR_RETURN(ERRNO, ret);
if (S_ISDIR(s.st_mode))
ret.attribute |= ATTR_DIRECTORY;
ret.size = s.st_size;
struct tm tm;
if (!localtime_r(&s.st_mtime, &tm))
FILE_ERROR_RETURN(ERRNO, ret);
ret.mtime = mktime(&tm);
return ret;
}
/* On MD we create a virtual symlink for the external drive,
* for this we need to override readlink(). */
ssize_t app_readlink(const char *path, char *buf, size_t bufsiz)
{
char _buf[MAX_PATH];
path = handle_special_dirs(path, 0, _buf, sizeof(_buf));
#ifdef HAVE_MULTIDRIVE
/* if path == _buf then we can be sure handle_special_dir() did something
* and path is not an ordinary directory */
if (path == _buf && !strncmp(path, MULTIDRIVE_DIR, sizeof(MULTIDRIVE_DIR)-1))
{
/* copying NUL is not required as per readlink specification */
ssize_t len = strlen(path);
memcpy(buf, path, len);
return len;
}
#endif
/* does not append NUL !! */
return os_readlink(path, buf, bufsiz);
(void) path; (void) buf; (void) bufsiz;
}
int os_volume_path(IF_MV(int volume, ) char *buffer, size_t bufsize)
{
#ifdef HAVE_MULTIVOLUME
char volname[VOL_MAX_LEN + 1];
get_volume_name(volume, volname);
#else
const char *volname = "/";
#endif
if (!handle_special_dirs(volname, NEED_WRITE, buffer, bufsize))
{
errno = ENAMETOOLONG;
return -1;
}
return 0;
}
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