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//usr/include/proftpd/fsio.h
/* * ProFTPD - FTP server daemon * Copyright (c) 1997, 1998 Public Flood Software * Copyright (c) 1999, 2000 MacGyver aka Habeeb J. Dihu <macgyver@tos.net> * Copyright (c) 2001-2024 The ProFTPD Project * * 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 program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA. * * As a special exemption, Public Flood Software/MacGyver aka Habeeb J. Dihu * and other respective copyright holders give permission to link this program * with OpenSSL, and distribute the resulting executable, without including * the source code for OpenSSL in the source distribution. */ /* ProFTPD virtual/modular filesystem support. */ #ifndef PR_FSIO_H #define PR_FSIO_H #include "conf.h" #include "error.h" #ifdef PR_USE_XATTR # if defined(HAVE_SYS_EXTATTR_H) # include <sys/extattr.h> # elif defined(HAVE_SYS_XATTR_H) # include <sys/xattr.h> # if defined(HAVE_ATTR_XATTR_H) # include <attr/xattr.h> # endif /* HAVE_ATTR_XATTR_H */ # endif /* HAVE_SYS_XATTR_H */ #endif /* PR_USE_XATTR */ /* This is a Tru64-specific hack, to work around some macro funkiness * in their /usr/include/sys/mount.h header. */ #ifdef OSF5 # undef fh_data #endif /* Operation codes */ #define FSIO_FILE_STAT 0x0000001 #define FSIO_FILE_LSTAT 0x0000002 #define FSIO_FILE_RENAME 0x0000004 #define FSIO_FILE_UNLINK 0x0000008 #define FSIO_FILE_OPEN 0x0000010 /* Was FSIO_FILE_CREAT, now unused */ #define FSIO_FILE_CLOSE 0x0000040 #define FSIO_FILE_READ 0x0000080 #define FSIO_FILE_WRITE 0x0000100 #define FSIO_FILE_LINK 0x0000200 #define FSIO_FILE_SYMLINK 0x0000400 #define FSIO_FILE_READLINK 0x0000800 #define FSIO_FILE_TRUNC 0x0001000 #define FSIO_FILE_CHMOD 0x0002000 #define FSIO_FILE_CHOWN 0x0004000 #define FSIO_FILE_ACCESS 0x0008000 #define FSIO_FILE_PREAD 0x0010000 #define FSIO_FILE_PWRITE 0x0020000 #define FSIO_FILE_UTIMES 0x0040000 #define FSIO_FILE_GETXATTR 0x0080000 #define FSIO_FILE_LGETXATTR 0x0100000 #define FSIO_FILE_LISTXATTR 0x0200000 #define FSIO_FILE_LLISTXATTR 0x0400000 #define FSIO_FILE_REMOVEXATTR 0x0800000 #define FSIO_FILE_LREMOVEXATTR 0x1000000 #define FSIO_FILE_SETXATTR 0x2000000 #define FSIO_FILE_LSETXATTR 0x4000000 #define FSIO_FILE_REALPATH 0x8000000 /* Macro that defines the most common file ops */ #define FSIO_FILE_COMMON (FSIO_FILE_OPEN|FSIO_FILE_READ|FSIO_FILE_WRITE|\ FSIO_FILE_CLOSE) #define FSIO_DIR_CHROOT (1 << 16) #define FSIO_DIR_CHDIR (1 << 17) #define FSIO_DIR_OPENDIR (1 << 18) #define FSIO_DIR_CLOSEDIR (1 << 19) #define FSIO_DIR_READDIR (1 << 20) #define FSIO_DIR_MKDIR (1 << 21) #define FSIO_DIR_RMDIR (1 << 22) /* Macro that defines directory operations */ #define FSIO_DIR_COMMON (FSIO_DIR_CHROOT|FSIO_DIR_CHDIR|\ FSIO_DIR_OPENDIR|FSIO_DIR_READDIR|\ FSIO_DIR_CLOSEDIR|FSIO_DIR_MKDIR|\ FSIO_DIR_RMDIR) /* Default mode used when creating files */ #define PR_OPEN_MODE 0666 /* Modular filesystem object */ typedef struct fs_rec pr_fs_t; typedef struct fh_rec pr_fh_t; struct fs_rec { /* These pointers will be effective once layered FS modules are * supported */ pr_fs_t *fs_next, *fs_prev; /* Descriptive tag for this FS object */ char *fs_name; /* Original name for this FS object. When FS handlers are inherited, * the name of the FS will be automatically updated to contain the * combined names, which changes things. */ char *fs_original_name; char *fs_path; /* Slot for module-specific data */ void *fs_data; /* Pool for this object's use */ struct pool_rec *fs_pool; /* FS function pointers */ int (*stat)(pr_fs_t *, const char *, struct stat *); int (*fstat)(pr_fh_t *, int, struct stat *); int (*lstat)(pr_fs_t *, const char *, struct stat *); int (*rename)(pr_fs_t *, const char *, const char *); int (*unlink)(pr_fs_t *, const char *); int (*open)(pr_fh_t *, const char *, int); int (*close)(pr_fh_t *, int); int (*read)(pr_fh_t *, int, char *, size_t); ssize_t (*pread)(pr_fh_t *, int, void *, size_t, off_t); int (*write)(pr_fh_t *, int, const char *, size_t); ssize_t (*pwrite)(pr_fh_t *, int, const void *, size_t, off_t); off_t (*lseek)(pr_fh_t *, int, off_t, int); int (*link)(pr_fs_t *, const char *, const char *); int (*readlink)(pr_fs_t *, const char *, char *, size_t); int (*symlink)(pr_fs_t *, const char *, const char *); int (*ftruncate)(pr_fh_t *, int, off_t); int (*truncate)(pr_fs_t *, const char *, off_t); int (*chmod)(pr_fs_t *, const char *, mode_t); int (*fchmod)(pr_fh_t *, int, mode_t); int (*chown)(pr_fs_t *, const char *, uid_t, gid_t); int (*fchown)(pr_fh_t *, int, uid_t, gid_t); int (*lchown)(pr_fs_t *, const char *, uid_t, gid_t); int (*access)(pr_fs_t *, const char *, int, uid_t, gid_t, array_header *); int (*faccess)(pr_fh_t *, int, uid_t, gid_t, array_header *); int (*utimes)(pr_fs_t *, const char *, struct timeval *); int (*futimes)(pr_fh_t *, int, struct timeval *); int (*fsync)(pr_fh_t *, int); const char *(*realpath)(pr_fs_t *, pool *p, const char *); /* Extended attribute support */ ssize_t (*getxattr)(pool *, pr_fs_t *, const char *, const char *, void *, size_t); ssize_t (*lgetxattr)(pool *, pr_fs_t *, const char *, const char *, void *, size_t); ssize_t (*fgetxattr)(pool *, pr_fh_t *, int, const char *, void *, size_t); int (*listxattr)(pool *, pr_fs_t *, const char *, array_header **); int (*llistxattr)(pool *, pr_fs_t *, const char *, array_header **); int (*flistxattr)(pool *, pr_fh_t *, int, array_header **); int (*removexattr)(pool *, pr_fs_t *, const char *, const char *); int (*lremovexattr)(pool *, pr_fs_t *, const char *, const char *); int (*fremovexattr)(pool *, pr_fh_t *, int, const char *); int (*setxattr)(pool *, pr_fs_t *, const char *, const char *, void *, size_t, int); int (*lsetxattr)(pool *, pr_fs_t *, const char *, const char *, void *, size_t, int); int (*fsetxattr)(pool *, pr_fh_t *, int, const char *, void *, size_t, int); /* For actual operations on the directory (or subdirs) * we cast the return from opendir to DIR* in src/fs.c, so * modules can use their own data type */ int (*chdir)(pr_fs_t *, const char *); int (*chroot)(pr_fs_t *, const char *); void *(*opendir)(pr_fs_t *, const char *); int (*closedir)(pr_fs_t *, void *); struct dirent *(*readdir)(pr_fs_t *, void *); int (*mkdir)(pr_fs_t *, const char *, mode_t); int (*rmdir)(pr_fs_t *, const char *); /* This flag determines whether this FS handler allows cross-FS hardlinks, * either from this FS to another FS, or from another FS to this FS. * * If the flag is set to FALSE by the FS registrant, then a hardlink * across FS handlers will fail, with errno set to EXDEV. The caller * will then have to handle the EXDEV error appropriately. */ int allow_xdev_link; /* This flag determines whether this FS handler allows cross-FS renames, * either from this FS to another FS, or from another FS to this FS. * * If the flag is set to FALSE by the FS registrant, then a rename * across FS handlers will fail, with errno set to EXDEV. The caller * will then have to handle the EXDEV error appropriately. * * In the core engine, a RNFR/RNTO sequence which encounters an EXDEV * error will cause a copy/delete of the file. This can be more IO * intensive than expected, and lead to longer times for the RNTO * command to complete. */ int allow_xdev_rename; /* This flag determines whether the paths handled by this FS handler * are standard, filesystem-based paths, and such use the standard * path separator, glob semantics, etc. */ int non_std_path; }; struct fh_rec { /* Pool for this object's use */ pool *fh_pool; int fh_fd; char *fh_path; /* Arbitrary data associated with this file. */ void *fh_data; /* Pointer to the filesystem in which this file is located. */ pr_fs_t *fh_fs; /* For buffer I/O on this file, should anything choose to use it. */ pr_buffer_t *fh_buf; /* Hint of the optimal buffer size for IO on this file. */ size_t fh_iosz; }; /* Maximum symlink count, for loop detection. */ #define PR_FSIO_MAX_LINK_COUNT 32 /* Macros for that code that needs to get into the internals of pr_fs_t. * (These will help keep the internals as opaque as possible). */ #define PR_FH_FD(f) ((f)->fh_fd) int pr_fsio_stat(const char *, struct stat *); int pr_fsio_fstat(pr_fh_t *, struct stat *); int pr_fsio_lstat(const char *, struct stat *); int pr_fsio_readlink(const char *, char *, size_t); int pr_fsio_chdir(const char *, int); int pr_fsio_chdir_canon(const char *, int); void *pr_fsio_opendir(const char *); int pr_fsio_closedir(void *); struct dirent *pr_fsio_readdir(void *); int pr_fsio_mkdir(const char *, mode_t); int pr_fsio_rmdir(const char *); int pr_fsio_rename(const char *, const char *); int pr_fsio_smkdir(pool *, const char *, mode_t, uid_t, gid_t); int pr_fsio_unlink(const char *); pr_fh_t *pr_fsio_open(const char *, int); pr_fh_t *pr_fsio_open_canon(const char *, int); int pr_fsio_close(pr_fh_t *); int pr_fsio_read(pr_fh_t *, char *, size_t); ssize_t pr_fsio_pread(pr_fh_t *, void *, size_t, off_t); int pr_fsio_write(pr_fh_t *, const char *, size_t); ssize_t pr_fsio_pwrite(pr_fh_t *, const void *, size_t, off_t); int pr_fsio_link(const char *, const char *); int pr_fsio_symlink(const char *, const char *); int pr_fsio_ftruncate(pr_fh_t *, off_t); int pr_fsio_truncate(const char *, off_t); int pr_fsio_chmod(const char *, mode_t); int pr_fsio_fchmod(pr_fh_t *, mode_t); int pr_fsio_chown(const char *, uid_t, gid_t); int pr_fsio_fchown(pr_fh_t *, uid_t, gid_t); int pr_fsio_lchown(const char *, uid_t, gid_t); int pr_fsio_chroot(const char *); int pr_fsio_access(const char *, int, uid_t, gid_t, array_header *); int pr_fsio_faccess(pr_fh_t *, int, uid_t, gid_t, array_header *); int pr_fsio_utimes(const char *, struct timeval *); int pr_fsio_utimes_with_root(const char *, struct timeval *); int pr_fsio_futimes(pr_fh_t *, struct timeval *); int pr_fsio_fsync(pr_fh_t *fh); off_t pr_fsio_lseek(pr_fh_t *, off_t, int); const char *pr_fsio_realpath(pool *p, const char *path); /* Extended attribute support */ ssize_t pr_fsio_getxattr(pool *p, const char *, const char *, void *, size_t); ssize_t pr_fsio_lgetxattr(pool *, const char *, const char *, void *, size_t); ssize_t pr_fsio_fgetxattr(pool *, pr_fh_t *, const char *, void *, size_t); int pr_fsio_listxattr(pool *, const char *, array_header **); int pr_fsio_llistxattr(pool *, const char *, array_header **); int pr_fsio_flistxattr(pool *, pr_fh_t *, array_header **); int pr_fsio_removexattr(pool *, const char *, const char *); int pr_fsio_lremovexattr(pool *, const char *, const char *); int pr_fsio_fremovexattr(pool *, pr_fh_t *, const char *); int pr_fsio_setxattr(pool *, const char *, const char *, void *, size_t, int); int pr_fsio_lsetxattr(pool *, const char *, const char *, void *, size_t, int); int pr_fsio_fsetxattr(pool *, pr_fh_t *, const char *, void *, size_t, int); /* setxattr flags */ #define PR_FSIO_XATTR_FL_CREATE 0x001 #define PR_FSIO_XATTR_FL_REPLACE 0x002 /* Error-using variants of the FSIO API. */ int pr_fsio_chmod_with_error(pool *p, const char *path, mode_t mode, pr_error_t **err); int pr_fsio_chown_with_error(pool *p, const char *path, uid_t uid, gid_t gid, pr_error_t **err); int pr_fsio_chroot_with_error(pool *p, const char *path, pr_error_t **err); int pr_fsio_close_with_error(pool *p, pr_fh_t *fh, pr_error_t **err); int pr_fsio_fchmod_with_error(pool *p, pr_fh_t *fh, mode_t mode, pr_error_t **err); int pr_fsio_fchown_with_error(pool *p, pr_fh_t *fh, uid_t uid, gid_t gid, pr_error_t **err); int pr_fsio_lchown_with_error(pool *p, const char *path, uid_t uid, gid_t gid, pr_error_t **err); int pr_fsio_lstat_with_error(pool *p, const char *path, struct stat *st, pr_error_t **err); int pr_fsio_mkdir_with_error(pool *p, const char *path, mode_t mode, pr_error_t **err); pr_fh_t *pr_fsio_open_with_error(pool *p, const char *path, int flags, pr_error_t **err); int pr_fsio_read_with_error(pool *p, pr_fh_t *fh, char *buf, size_t sz, pr_error_t **err); int pr_fsio_rename_with_error(pool *p, const char *from, const char *to, pr_error_t **err); int pr_fsio_rmdir_with_error(pool *p, const char *path, pr_error_t **err); int pr_fsio_stat_with_error(pool *p, const char *path, struct stat *st, pr_error_t **err); int pr_fsio_unlink_with_error(pool *p, const char *path, pr_error_t **err); int pr_fsio_write_with_error(pool *p, pr_fh_t *fh, const char *buf, size_t sz, pr_error_t **err); /* Set a flag determining whether we guard against write operations in * certain sensitive directories while we are chrooted, e.g. "Roaring Beast" * style attacks. */ int pr_fsio_guard_chroot(int); /* Set a flag determining whether to use mkdtemp(3) (if available) or not. * Returns the previously-set value. */ int pr_fsio_set_use_mkdtemp(int); /* Sets a bitmask of various FSIO API options. Returns the previously * set options. */ unsigned long pr_fsio_set_options(unsigned long opts); #define PR_FSIO_OPT_IGNORE_XATTR 0x00001 /* FS-related functions */ char *pr_fsio_getline(char *, size_t, pr_fh_t *, unsigned int *); char *pr_fsio_getpipebuf(pool *, int, long *); char *pr_fsio_gets(char *, size_t, pr_fh_t *); int pr_fsio_puts(const char *, pr_fh_t *); int pr_fsio_set_block(pr_fh_t *); pr_fs_t *pr_register_fs(pool *, const char *, const char *); pr_fs_t *pr_register_fs2(pool *, const char *, const char *, int); #define PR_FSIO_REGISTER_FL_INHERIT_HANDLERS 0x00001 pr_fs_t *pr_create_fs(pool *, const char *); pr_fs_t *pr_get_fs(const char *, int *); int pr_insert_fs(pr_fs_t *, const char *); pr_fs_t *pr_remove_fs(const char *); pr_fs_t *pr_unmount_fs(const char *, const char *); int pr_unregister_fs(const char *); /* FS Statcache API */ void pr_fs_clear_cache(void); int pr_fs_clear_cache2(const char *path); /* Dump the current contents of the statcache via trace logging, to the * "fs.statcache" trace channel. */ void pr_fs_statcache_dump(void); /* Clears the entire statcache. */ void pr_fs_statcache_free(void); /* Clears the entire statcache and re-creates the memory pool. */ void pr_fs_statcache_reset(void); /* Tune the statcache policy: max number of items in the cache at any * one time, the max age (in seconds) for items in the cache, and the policy * flags. * * Note that setting a size of zero, OR setting a max age of zero, effectively * disables the statcache. */ int pr_fs_statcache_set_policy(unsigned int size, unsigned int max_age, unsigned int flags); /* Copy a file from the given source path to the destination path. */ int pr_fs_copy_file(const char *src, const char *dst); /* Similar to pr_fs_copy_file(), with the addition of an optional progress * callback, invoked during the potentially long-running copy process. * * The callback, when present, will be invoked with the number of bytes * just written to the destination file in that iteration. */ int pr_fs_copy_file2(const char *src, const char *dst, int flags, void (*progress_cb)(int)); #define PR_FSIO_COPY_FILE_FL_NO_DELETE_ON_FAILURE 0x0001 int pr_fs_setcwd(const char *); const char *pr_fs_getcwd(void); const char *pr_fs_getvwd(void); int pr_fs_dircat(char *, int, const char *, const char *); int pr_fs_interpolate(const char *, char *, size_t); int pr_fs_resolve_partial(const char *, char *, size_t, int); int pr_fs_resolve_path(const char *, char *, size_t, int); char *pr_fs_decode_path(pool *, const char *); /* Similar to pr_fs_decode_path(), but allows callers to provide flags. These * flags can be used, for example, to request that if there are errors during * the decoding, the function NOT hide/mask them, as is done by default, but * convey them to the caller for handling at a higher code layer. */ char *pr_fs_decode_path2(pool *, const char *, int); #define FSIO_DECODE_FL_TELL_ERRORS 0x001 char *pr_fs_encode_path(pool *, const char *); int pr_fs_use_encoding(int); /* Split the given path into its individual path components. */ array_header *pr_fs_split_path(pool *p, const char *path); /* Given an array of individual path components, join them into a single * path. The count parameter indicates how many components in the array, * starting from zero, to use. */ char *pr_fs_join_path(pool *p, array_header *components, size_t count); int pr_fs_valid_path(const char *); void pr_fs_virtual_path(const char *, char *, size_t); void pr_fs_clean_path(const char *, char *, size_t); int pr_fs_clean_path2(const char *, char *, size_t, int); #define PR_FSIO_CLEAN_PATH_FL_MAKE_ABS_PATH 0x001 int pr_fs_glob(const char *, int, int (*errfunc)(const char *, int), glob_t *); void pr_fs_globfree(glob_t *); void pr_resolve_fs_map(void); /* Close all but the main three fds. */ void pr_fs_close_extra_fds(void); /* The main three fds (stdin, stdout, stderr) need to be protected, reserved * for use. This function uses dup(2) to open new fds on the given fd * until the new fd is not one of the big three. */ int pr_fs_get_usable_fd(int); /* Similar to pr_fs_get_usable_fd(), except that it automatically closes the * old (given) fd if a usable fd was found. Returns -1 (with errno set) if * a usable fd could not be found. */ int pr_fs_get_usable_fd2(int *); #if defined(HAVE_STATFS) || defined(HAVE_SYS_STATVFS_H) || \ defined(HAVE_SYS_VFS_H) off_t pr_fs_getsize(char *); #endif /* Unlike pr_fs_getsize(), this function is always present, and is also * capable of returning an error when there is a problem checking the * filesystem stats. */ int pr_fs_getsize2(char *, off_t *); /* Similar to pr_fs_getsize2(), except that this operates on an already-opened * file descriptor, rather than a path. */ int pr_fs_fgetsize(int, off_t *); /* Perform access(2)-like checks on the given struct stat. */ int pr_fs_have_access(struct stat *st, int mode, uid_t uid, gid_t gid, array_header *suppl_gids); /* Returns TRUE if the given path is on an NFS-mounted filesystem, FALSE * if not on an NFS-mounted filesystem, and -1 if there was an error * determining which (with errno set appropriately). */ int pr_fs_is_nfs(const char *path); /* Provide advice/hints to the OS about what we are going to do with the * given section of the opened file. */ void pr_fs_fadvise(int fd, off_t offset, off_t len, int advice); #define PR_FS_FADVISE_NORMAL 10 #define PR_FS_FADVISE_RANDOM 11 #define PR_FS_FADVISE_SEQUENTIAL 12 #define PR_FS_FADVISE_WILLNEED 13 #define PR_FS_FADVISE_DONTNEED 14 #define PR_FS_FADVISE_NOREUSE 15 /* For internal use only. */ int init_fs(void); #ifdef PR_USE_DEVEL void pr_fs_dump(void (*)(const char *, ...)); #endif /* PR_USE_DEVEL */ #endif /* PR_FSIO_H */
