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sshfs.c
4499 lines (3939 loc) · 105 KB
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sshfs.c
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/*
SSH file system
Copyright (C) 2004 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
*/
#define _GNU_SOURCE /* avoid implicit declaration of *pt* functions */
#include "config.h"
#include <fuse.h>
#include <fuse_opt.h>
#if !defined(__CYGWIN__)
# include <fuse_lowlevel.h>
#endif
#ifdef __APPLE__
# include <fuse_darwin.h>
#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#ifndef __APPLE__
# include <semaphore.h>
#endif
#include <pthread.h>
#include <netdb.h>
#include <signal.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/utsname.h>
#include <sys/mman.h>
#include <poll.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <glib.h>
#include <pwd.h>
#include <grp.h>
#include <limits.h>
#ifdef __APPLE__
# include <strings.h>
# include <libgen.h>
# include <darwin_compat.h>
#endif
#ifdef __linux__
# include <linux/vm_sockets.h>
#endif
#include "cache.h"
#ifndef MAP_LOCKED
# define MAP_LOCKED 0
#endif
#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
# define MAP_ANONYMOUS MAP_ANON
#endif
#define SSH_FXP_INIT 1
#define SSH_FXP_VERSION 2
#define SSH_FXP_OPEN 3
#define SSH_FXP_CLOSE 4
#define SSH_FXP_READ 5
#define SSH_FXP_WRITE 6
#define SSH_FXP_LSTAT 7
#define SSH_FXP_FSTAT 8
#define SSH_FXP_SETSTAT 9
#define SSH_FXP_FSETSTAT 10
#define SSH_FXP_OPENDIR 11
#define SSH_FXP_READDIR 12
#define SSH_FXP_REMOVE 13
#define SSH_FXP_MKDIR 14
#define SSH_FXP_RMDIR 15
#define SSH_FXP_REALPATH 16
#define SSH_FXP_STAT 17
#define SSH_FXP_RENAME 18
#define SSH_FXP_READLINK 19
#define SSH_FXP_SYMLINK 20
#define SSH_FXP_STATUS 101
#define SSH_FXP_HANDLE 102
#define SSH_FXP_DATA 103
#define SSH_FXP_NAME 104
#define SSH_FXP_ATTRS 105
#define SSH_FXP_EXTENDED 200
#define SSH_FXP_EXTENDED_REPLY 201
#define SSH_FILEXFER_ATTR_SIZE 0x00000001
#define SSH_FILEXFER_ATTR_UIDGID 0x00000002
#define SSH_FILEXFER_ATTR_PERMISSIONS 0x00000004
#define SSH_FILEXFER_ATTR_ACMODTIME 0x00000008
#define SSH_FILEXFER_ATTR_EXTENDED 0x80000000
#define SSH_FX_OK 0
#define SSH_FX_EOF 1
#define SSH_FX_NO_SUCH_FILE 2
#define SSH_FX_PERMISSION_DENIED 3
#define SSH_FX_FAILURE 4
#define SSH_FX_BAD_MESSAGE 5
#define SSH_FX_NO_CONNECTION 6
#define SSH_FX_CONNECTION_LOST 7
#define SSH_FX_OP_UNSUPPORTED 8
#define SSH_FXF_READ 0x00000001
#define SSH_FXF_WRITE 0x00000002
#define SSH_FXF_APPEND 0x00000004
#define SSH_FXF_CREAT 0x00000008
#define SSH_FXF_TRUNC 0x00000010
#define SSH_FXF_EXCL 0x00000020
/* statvfs@openssh.com f_flag flags */
#define SSH2_FXE_STATVFS_ST_RDONLY 0x00000001
#define SSH2_FXE_STATVFS_ST_NOSUID 0x00000002
#define SFTP_EXT_POSIX_RENAME "posix-rename@openssh.com"
#define SFTP_EXT_STATVFS "statvfs@openssh.com"
#define SFTP_EXT_HARDLINK "hardlink@openssh.com"
#define SFTP_EXT_FSYNC "fsync@openssh.com"
#define PROTO_VERSION 3
#define MY_EOF 1
#define MAX_REPLY_LEN (1 << 17)
#define RENAME_TEMP_CHARS 8
#define SFTP_SERVER_PATH "/usr/lib/sftp-server"
/* Asynchronous readdir parameters */
#define READDIR_START 2
#define READDIR_MAX 32
#define MAX_PASSWORD 1024
/*
Handling of multiple SFTP connections
--------------------------------------
An SFTP server is free to return responses to outstanding requests in arbitrary
order. However, execution of requests may only be re-ordered and parallelized as long
as "the results in the responses will be the same as if [the client] had sent the
requests one at a time and waited for the response in each case".
(https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-6.1).
When using multiple connections, this requirement applies independently for each
connection. We therefore have to make sure in SSHFS that the way in which we distribute
requests between connections does not affect the responses that we get.
In general, this is a tricky problem to solve since for each incoming request we have
to determine which other in-flight requests may interact with it, and then either
transmit the request through the same connection or (if there are multiple connections
involved) wait for the other requests to complete. This means that e.g. a readdir
request would have to block on most other activity in the same directory, eliminating a
major advantage of using multiple connections.
In practice, we can luckily take advantage of the knowledge that most FUSE requests are
the result of (synchronous) syscalls from userspace that will block until the
corresponding FUSE response has been sent.
If -o sshfs_sync is used, SSHFS always waits for the SFTP server response before
returning a FUSE response to userspace. If userspace makes concurrent system calls,
there is no ordering guarantee in the first place, so we do not have to worry about
(re-)ordering within SSHFS either.
For requests that originate in the kernel (rather than userspace), the situation is
slightly different. Transmission of FUSE requests and responses is decoupled (there are
no synchronous calls) and there is no formal specification that defines if reordering
is permitted. However, the Linux kernel seems to avoid submitting any concurrent
requests that would give different results depending on execution order and (as of
kernel 4.20 with writeback caching disabled) the only kind of kernel originated
requests are read() requests for read-ahead. Since libfuse internally uses multiple
threads, SSHFS does not necessarily receive requests in the order in which they were
sent by the kernel. Unless there is a major bug in FUSE, there is therefore no need to
worry about correct sequencing of such calls even when using multiple SFTP connections.
If -o sshfs_sync is *not* used, then write() syscalls will return to userspace before
SSHFS has received responses from the SFTP server. If userspace then issues a second
syscall related to the same file (and only one connection is in-use), SFTP ordering
guarantees will ensure that the response takes into account the preceding writes. If
multiple connections are in use, this has to be ensured by SSHFS instead.
The easiest way to do so would be to bind specific SFTP connections to file
handles. Unfortunately, not all requests for the same dentry are guaranteed to come
from the same file handle and some requests may come without any file handle. We
therefore maintain a separate mapping from currently open files to SFTP connections. If
a request comes in for a path contained in sshfs.conntab and its result could be
changed by a pending write() operation, it will always be executed with the
associated SFTP connection.
There are additional subtleties for requests that affect multiple paths. For example,
if both source and destination of a rename() request are currently open, which
connection should be used?
This problem is again hard in general, but solvable since we only have to worry about
the effects of pending write() calls. For rename() and link(), it does not matter if a
pending write is executed before or after the operation. For readdir(), it is possible
that a pending write() will change the length of the file. However, SSHFS currently
does not return attribute information for readdir(), so this does not pose problems
either. Should SSHFS implement a readdirplus() handler (which provides file names and
attributes) this is a problem that will need to be solved.
*/
#ifdef __APPLE__
static char sshfs_program_path[PATH_MAX] = { 0 };
#endif /* __APPLE__ */
struct conn {
pthread_mutex_t lock_write;
int processing_thread_started;
int rfd;
int wfd;
int connver;
int req_count;
int dir_count;
int file_count;
};
struct buffer {
uint8_t *p;
size_t len;
size_t size;
};
struct dir_handle {
struct buffer buf;
struct conn *conn;
};
struct list_head {
struct list_head *prev;
struct list_head *next;
};
struct request;
typedef void (*request_func)(struct request *);
struct request {
unsigned int want_reply;
sem_t ready;
uint8_t reply_type;
uint32_t id;
int replied;
int error;
struct buffer reply;
struct timeval start;
void *data;
request_func end_func;
size_t len;
struct list_head list;
struct conn *conn;
};
struct sshfs_io {
int num_reqs;
pthread_cond_t finished;
int error;
};
struct read_req {
struct sshfs_io *sio;
struct list_head list;
struct buffer data;
size_t size;
ssize_t res;
};
struct read_chunk {
off_t offset;
size_t size;
int refs;
long modifver;
struct list_head reqs;
struct sshfs_io sio;
};
struct sshfs_file {
struct buffer handle;
struct list_head write_reqs;
pthread_cond_t write_finished;
int write_error;
struct read_chunk *readahead;
off_t next_pos;
int is_seq;
struct conn *conn;
int connver;
int modifver;
};
struct conntab_entry {
unsigned refcount;
struct conn *conn;
};
struct sshfs {
char *directport;
char *ssh_command;
char *sftp_server;
struct fuse_args ssh_args;
char *workarounds;
int rename_workaround;
int renamexdev_workaround;
int truncate_workaround;
int buflimit_workaround;
int unrel_append;
int fstat_workaround;
int createmode_workaround;
int transform_symlinks;
int follow_symlinks;
int no_check_root;
int detect_uid;
int idmap;
int nomap;
int disable_hardlink;
int dir_cache;
int show_version;
int show_help;
int singlethread;
char *mountpoint;
char *uid_file;
char *gid_file;
GHashTable *uid_map;
GHashTable *gid_map;
GHashTable *r_uid_map;
GHashTable *r_gid_map;
unsigned max_read;
unsigned max_write;
unsigned ssh_ver;
int sync_write;
int sync_read;
int sync_readdir;
int direct_io;
int debug;
int verbose;
int foreground;
int reconnect;
int delay_connect;
int passive;
char *host;
char *base_path;
GHashTable *reqtab;
GHashTable *conntab;
pthread_mutex_t lock;
unsigned int randseed;
int max_conns;
char *vsock;
struct conn *conns;
int ptyfd;
int ptypassivefd;
int connvers;
int server_version;
unsigned remote_uid;
unsigned local_uid;
unsigned remote_gid;
unsigned local_gid;
int remote_uid_detected;
unsigned blksize;
char *progname;
long modifver;
unsigned outstanding_len;
unsigned max_outstanding_len;
pthread_cond_t outstanding_cond;
int password_stdin;
char *password;
int ext_posix_rename;
int ext_statvfs;
int ext_hardlink;
int ext_fsync;
struct fuse_operations *op;
/* statistics */
uint64_t bytes_sent;
uint64_t bytes_received;
uint64_t num_sent;
uint64_t num_received;
unsigned int min_rtt;
unsigned int max_rtt;
uint64_t total_rtt;
unsigned int num_connect;
};
static struct sshfs sshfs;
static const char *ssh_opts[] = {
"AddressFamily",
"BatchMode",
"BindAddress",
"BindInterface",
"CertificateFile",
"ChallengeResponseAuthentication",
"CheckHostIP",
"Cipher",
"Ciphers",
"Compression",
"CompressionLevel",
"ConnectionAttempts",
"ConnectTimeout",
"ControlMaster",
"ControlPath",
"ControlPersist",
"FingerprintHash",
"GlobalKnownHostsFile",
"GSSAPIAuthentication",
"GSSAPIDelegateCredentials",
"HostbasedAuthentication",
"HostbasedKeyTypes",
"HostKeyAlgorithms",
"HostKeyAlias",
"HostName",
"IdentitiesOnly",
"IdentityFile",
"IdentityAgent",
"IPQoS",
"KbdInteractiveAuthentication",
"KbdInteractiveDevices",
"KexAlgorithms",
"LocalCommand",
"LogLevel",
"MACs",
"NoHostAuthenticationForLocalhost",
"NumberOfPasswordPrompts",
"PasswordAuthentication",
"PermitLocalCommand",
"PKCS11Provider",
"Port",
"PreferredAuthentications",
"ProxyCommand",
"ProxyJump",
"ProxyUseFdpass",
"PubkeyAcceptedKeyTypes",
"PubkeyAuthentication",
"RekeyLimit",
"RevokedHostKeys",
"RhostsRSAAuthentication",
"RSAAuthentication",
"ServerAliveCountMax",
"ServerAliveInterval",
"SmartcardDevice",
"StrictHostKeyChecking",
"TCPKeepAlive",
"UpdateHostKeys",
"UsePrivilegedPort",
"UserKnownHostsFile",
"VerifyHostKeyDNS",
"VisualHostKey",
NULL,
};
enum {
KEY_PORT,
KEY_COMPRESS,
KEY_CONFIGFILE,
};
enum {
IDMAP_NONE,
IDMAP_USER,
IDMAP_FILE,
};
enum {
NOMAP_IGNORE,
NOMAP_ERROR,
};
#define SSHFS_OPT(t, p, v) { t, offsetof(struct sshfs, p), v }
static struct fuse_opt sshfs_opts[] = {
SSHFS_OPT("directport=%s", directport, 0),
SSHFS_OPT("ssh_command=%s", ssh_command, 0),
SSHFS_OPT("sftp_server=%s", sftp_server, 0),
SSHFS_OPT("max_read=%u", max_read, 0),
SSHFS_OPT("max_write=%u", max_write, 0),
SSHFS_OPT("ssh_protocol=%u", ssh_ver, 0),
SSHFS_OPT("-1", ssh_ver, 1),
SSHFS_OPT("workaround=%s", workarounds, 0),
SSHFS_OPT("idmap=none", idmap, IDMAP_NONE),
SSHFS_OPT("idmap=user", idmap, IDMAP_USER),
SSHFS_OPT("idmap=file", idmap, IDMAP_FILE),
SSHFS_OPT("uidfile=%s", uid_file, 0),
SSHFS_OPT("gidfile=%s", gid_file, 0),
SSHFS_OPT("nomap=ignore", nomap, NOMAP_IGNORE),
SSHFS_OPT("nomap=error", nomap, NOMAP_ERROR),
SSHFS_OPT("sshfs_sync", sync_write, 1),
SSHFS_OPT("no_readahead", sync_read, 1),
SSHFS_OPT("sync_readdir", sync_readdir, 1),
SSHFS_OPT("sshfs_debug", debug, 1),
SSHFS_OPT("sshfs_verbose", verbose, 1),
SSHFS_OPT("reconnect", reconnect, 1),
SSHFS_OPT("transform_symlinks", transform_symlinks, 1),
SSHFS_OPT("follow_symlinks", follow_symlinks, 1),
SSHFS_OPT("no_check_root", no_check_root, 1),
SSHFS_OPT("password_stdin", password_stdin, 1),
SSHFS_OPT("delay_connect", delay_connect, 1),
SSHFS_OPT("slave", passive, 1),
SSHFS_OPT("passive", passive, 1),
SSHFS_OPT("disable_hardlink", disable_hardlink, 1),
SSHFS_OPT("dir_cache=yes", dir_cache, 1),
SSHFS_OPT("dir_cache=no", dir_cache, 0),
SSHFS_OPT("direct_io", direct_io, 1),
SSHFS_OPT("max_conns=%u", max_conns, 1),
SSHFS_OPT("vsock=%s", vsock, 0),
SSHFS_OPT("-h", show_help, 1),
SSHFS_OPT("--help", show_help, 1),
SSHFS_OPT("-V", show_version, 1),
SSHFS_OPT("--version", show_version, 1),
SSHFS_OPT("-d", debug, 1),
SSHFS_OPT("debug", debug, 1),
SSHFS_OPT("-v", verbose, 1),
SSHFS_OPT("verbose", verbose, 1),
SSHFS_OPT("-f", foreground, 1),
SSHFS_OPT("-s", singlethread, 1),
FUSE_OPT_KEY("-p ", KEY_PORT),
FUSE_OPT_KEY("-C", KEY_COMPRESS),
FUSE_OPT_KEY("-F ", KEY_CONFIGFILE),
/* For backwards compatibility */
SSHFS_OPT("cache=yes", dir_cache, 1),
SSHFS_OPT("cache=no", dir_cache, 0),
FUSE_OPT_KEY("writeback_cache=no", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("unreliable_append", FUSE_OPT_KEY_DISCARD),
/* These may come in from /etc/fstab - we just ignore them */
FUSE_OPT_KEY("auto", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("noauto", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("user", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("nouser", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("users", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_KEY("_netdev", FUSE_OPT_KEY_DISCARD),
FUSE_OPT_END
};
static struct fuse_opt workaround_opts[] = {
SSHFS_OPT("none", rename_workaround, 0),
SSHFS_OPT("none", truncate_workaround, 0),
SSHFS_OPT("none", buflimit_workaround, 0),
SSHFS_OPT("none", fstat_workaround, 0),
SSHFS_OPT("rename", rename_workaround, 1),
SSHFS_OPT("norename", rename_workaround, 0),
SSHFS_OPT("renamexdev", renamexdev_workaround, 1),
SSHFS_OPT("norenamexdev", renamexdev_workaround, 0),
SSHFS_OPT("truncate", truncate_workaround, 1),
SSHFS_OPT("notruncate", truncate_workaround, 0),
SSHFS_OPT("buflimit", buflimit_workaround, 1),
SSHFS_OPT("nobuflimit", buflimit_workaround, 0),
SSHFS_OPT("fstat", fstat_workaround, 1),
SSHFS_OPT("nofstat", fstat_workaround, 0),
SSHFS_OPT("createmode", createmode_workaround, 1),
SSHFS_OPT("nocreatemode", createmode_workaround, 0),
FUSE_OPT_END
};
#define DEBUG(format, args...) \
do { if (sshfs.debug) fprintf(stderr, format, args); } while(0)
static const char *type_name(uint8_t type)
{
switch(type) {
case SSH_FXP_INIT: return "INIT";
case SSH_FXP_VERSION: return "VERSION";
case SSH_FXP_OPEN: return "OPEN";
case SSH_FXP_CLOSE: return "CLOSE";
case SSH_FXP_READ: return "READ";
case SSH_FXP_WRITE: return "WRITE";
case SSH_FXP_LSTAT: return "LSTAT";
case SSH_FXP_FSTAT: return "FSTAT";
case SSH_FXP_SETSTAT: return "SETSTAT";
case SSH_FXP_FSETSTAT: return "FSETSTAT";
case SSH_FXP_OPENDIR: return "OPENDIR";
case SSH_FXP_READDIR: return "READDIR";
case SSH_FXP_REMOVE: return "REMOVE";
case SSH_FXP_MKDIR: return "MKDIR";
case SSH_FXP_RMDIR: return "RMDIR";
case SSH_FXP_REALPATH: return "REALPATH";
case SSH_FXP_STAT: return "STAT";
case SSH_FXP_RENAME: return "RENAME";
case SSH_FXP_READLINK: return "READLINK";
case SSH_FXP_SYMLINK: return "SYMLINK";
case SSH_FXP_STATUS: return "STATUS";
case SSH_FXP_HANDLE: return "HANDLE";
case SSH_FXP_DATA: return "DATA";
case SSH_FXP_NAME: return "NAME";
case SSH_FXP_ATTRS: return "ATTRS";
case SSH_FXP_EXTENDED: return "EXTENDED";
case SSH_FXP_EXTENDED_REPLY: return "EXTENDED_REPLY";
default: return "???";
}
}
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#define list_entry(ptr, type, member) \
container_of(ptr, type, member)
static void list_init(struct list_head *head)
{
head->next = head;
head->prev = head;
}
static void list_add(struct list_head *new, struct list_head *head)
{
struct list_head *prev = head;
struct list_head *next = head->next;
next->prev = new;
new->next = next;
new->prev = prev;
prev->next = new;
}
static void list_del(struct list_head *entry)
{
struct list_head *prev = entry->prev;
struct list_head *next = entry->next;
next->prev = prev;
prev->next = next;
}
static int list_empty(const struct list_head *head)
{
return head->next == head;
}
/* given a pointer to the uid/gid, and the mapping table, remap the
* uid/gid, if necessary */
static inline int translate_id(uint32_t *id, GHashTable *map)
{
gpointer id_p;
if (g_hash_table_lookup_extended(map, GUINT_TO_POINTER(*id), NULL, &id_p)) {
*id = GPOINTER_TO_UINT(id_p);
return 0;
}
switch (sshfs.nomap) {
case NOMAP_ERROR: return -1;
case NOMAP_IGNORE: return 0;
default:
fprintf(stderr, "internal error\n");
abort();
}
}
static inline void buf_init(struct buffer *buf, size_t size)
{
if (size) {
buf->p = (uint8_t *) malloc(size);
if (!buf->p) {
fprintf(stderr, "sshfs: memory allocation failed\n");
abort();
}
} else
buf->p = NULL;
buf->len = 0;
buf->size = size;
}
static inline void buf_free(struct buffer *buf)
{
free(buf->p);
}
static inline void buf_finish(struct buffer *buf)
{
buf->len = buf->size;
}
static inline void buf_clear(struct buffer *buf)
{
buf_free(buf);
buf_init(buf, 0);
}
static void buf_resize(struct buffer *buf, size_t len)
{
buf->size = (buf->len + len + 63) & ~31;
buf->p = (uint8_t *) realloc(buf->p, buf->size);
if (!buf->p) {
fprintf(stderr, "sshfs: memory allocation failed\n");
abort();
}
}
static inline void buf_check_add(struct buffer *buf, size_t len)
{
if (buf->len + len > buf->size)
buf_resize(buf, len);
}
#define _buf_add_mem(b, d, l) \
buf_check_add(b, l); \
memcpy(b->p + b->len, d, l); \
b->len += l;
static inline void buf_add_mem(struct buffer *buf, const void *data,
size_t len)
{
_buf_add_mem(buf, data, len);
}
static inline void buf_add_buf(struct buffer *buf, const struct buffer *bufa)
{
_buf_add_mem(buf, bufa->p, bufa->len);
}
static inline void buf_add_uint8(struct buffer *buf, uint8_t val)
{
_buf_add_mem(buf, &val, 1);
}
static inline void buf_add_uint32(struct buffer *buf, uint32_t val)
{
uint32_t nval = htonl(val);
_buf_add_mem(buf, &nval, 4);
}
static inline void buf_add_uint64(struct buffer *buf, uint64_t val)
{
buf_add_uint32(buf, val >> 32);
buf_add_uint32(buf, val & 0xffffffff);
}
static inline void buf_add_data(struct buffer *buf, const struct buffer *data)
{
buf_add_uint32(buf, data->len);
buf_add_mem(buf, data->p, data->len);
}
static inline void buf_add_string(struct buffer *buf, const char *str)
{
struct buffer data;
data.p = (uint8_t *) str;
data.len = strlen(str);
buf_add_data(buf, &data);
}
static inline void buf_add_path(struct buffer *buf, const char *path)
{
char *realpath;
if (sshfs.base_path[0]) {
if (path[1]) {
if (sshfs.base_path[strlen(sshfs.base_path)-1] != '/') {
realpath = g_strdup_printf("%s/%s",
sshfs.base_path,
path + 1);
} else {
realpath = g_strdup_printf("%s%s",
sshfs.base_path,
path + 1);
}
} else {
realpath = g_strdup(sshfs.base_path);
}
} else {
if (path[1])
realpath = g_strdup(path + 1);
else
realpath = g_strdup(".");
}
buf_add_string(buf, realpath);
g_free(realpath);
}
static int buf_check_get(struct buffer *buf, size_t len)
{
if (buf->len + len > buf->size) {
fprintf(stderr, "buffer too short\n");
return -1;
} else
return 0;
}
static inline int buf_get_mem(struct buffer *buf, void *data, size_t len)
{
if (buf_check_get(buf, len) == -1)
return -1;
memcpy(data, buf->p + buf->len, len);
buf->len += len;
return 0;
}
static inline int buf_get_uint8(struct buffer *buf, uint8_t *val)
{
return buf_get_mem(buf, val, 1);
}
static inline int buf_get_uint32(struct buffer *buf, uint32_t *val)
{
uint32_t nval;
if (buf_get_mem(buf, &nval, 4) == -1)
return -1;
*val = ntohl(nval);
return 0;
}
static inline int buf_get_uint64(struct buffer *buf, uint64_t *val)
{
uint32_t val1;
uint32_t val2;
if (buf_get_uint32(buf, &val1) == -1 ||
buf_get_uint32(buf, &val2) == -1) {
return -1;
}
*val = ((uint64_t) val1 << 32) + val2;
return 0;
}
static inline int buf_get_data(struct buffer *buf, struct buffer *data)
{
uint32_t len;
if (buf_get_uint32(buf, &len) == -1 || len > buf->size - buf->len)
return -1;
buf_init(data, len + 1);
data->size = len;
if (buf_get_mem(buf, data->p, data->size) == -1) {
buf_free(data);
return -1;
}
return 0;
}
static inline int buf_get_string(struct buffer *buf, char **str)
{
struct buffer data;
if (buf_get_data(buf, &data) == -1)
return -1;
data.p[data.size] = '\0';
*str = (char *) data.p;
return 0;
}
static int buf_get_attrs(struct buffer *buf, struct stat *stbuf, int *flagsp)
{
uint32_t flags;
uint64_t size = 0;
uint32_t uid = 0;
uint32_t gid = 0;
uint32_t atime = 0;
uint32_t mtime = 0;
uint32_t mode = S_IFREG | 0777;
if (buf_get_uint32(buf, &flags) == -1)
return -EIO;
if (flagsp)
*flagsp = flags;
if ((flags & SSH_FILEXFER_ATTR_SIZE) &&
buf_get_uint64(buf, &size) == -1)
return -EIO;
if ((flags & SSH_FILEXFER_ATTR_UIDGID) &&
(buf_get_uint32(buf, &uid) == -1 ||
buf_get_uint32(buf, &gid) == -1))
return -EIO;
if ((flags & SSH_FILEXFER_ATTR_PERMISSIONS) &&
buf_get_uint32(buf, &mode) == -1)
return -EIO;
if ((flags & SSH_FILEXFER_ATTR_ACMODTIME)) {
if (buf_get_uint32(buf, &atime) == -1 ||
buf_get_uint32(buf, &mtime) == -1)
return -EIO;
}
if ((flags & SSH_FILEXFER_ATTR_EXTENDED)) {
uint32_t extcount;
unsigned i;
if (buf_get_uint32(buf, &extcount) == -1)
return -EIO;
for (i = 0; i < extcount; i++) {
struct buffer tmp;
if (buf_get_data(buf, &tmp) == -1)
return -EIO;
buf_free(&tmp);
if (buf_get_data(buf, &tmp) == -1)
return -EIO;
buf_free(&tmp);
}
}
if (sshfs.remote_uid_detected) {
if (uid == sshfs.remote_uid)
uid = sshfs.local_uid;
if (gid == sshfs.remote_gid)
gid = sshfs.local_gid;
}
if (sshfs.idmap == IDMAP_FILE && sshfs.uid_map)
if (translate_id(&uid, sshfs.uid_map) == -1)
return -EPERM;
if (sshfs.idmap == IDMAP_FILE && sshfs.gid_map)
if (translate_id(&gid, sshfs.gid_map) == -1)
return -EPERM;
memset(stbuf, 0, sizeof(struct stat));
stbuf->st_mode = mode;
stbuf->st_nlink = 1;
stbuf->st_size = size;
if (sshfs.blksize) {
stbuf->st_blksize = sshfs.blksize;
stbuf->st_blocks = ((size + sshfs.blksize - 1) &
~((unsigned long long) sshfs.blksize - 1)) >> 9;
}
stbuf->st_uid = uid;
stbuf->st_gid = gid;
stbuf->st_atime = atime;
stbuf->st_ctime = stbuf->st_mtime = mtime;
return 0;
}
static int buf_get_statvfs(struct buffer *buf, struct statvfs *stbuf)
{
uint64_t bsize;
uint64_t frsize;
uint64_t blocks;
uint64_t bfree;
uint64_t bavail;
uint64_t files;
uint64_t ffree;
uint64_t favail;
uint64_t fsid;
uint64_t flag;
uint64_t namemax;
if (buf_get_uint64(buf, &bsize) == -1 ||
buf_get_uint64(buf, &frsize) == -1 ||
buf_get_uint64(buf, &blocks) == -1 ||
buf_get_uint64(buf, &bfree) == -1 ||
buf_get_uint64(buf, &bavail) == -1 ||
buf_get_uint64(buf, &files) == -1 ||
buf_get_uint64(buf, &ffree) == -1 ||
buf_get_uint64(buf, &favail) == -1 ||
buf_get_uint64(buf, &fsid) == -1 ||
buf_get_uint64(buf, &flag) == -1 ||
buf_get_uint64(buf, &namemax) == -1) {
return -1;
}
memset(stbuf, 0, sizeof(struct statvfs));
stbuf->f_bsize = bsize;
stbuf->f_frsize = frsize;
stbuf->f_blocks = blocks;
stbuf->f_bfree = bfree;
stbuf->f_bavail = bavail;
stbuf->f_files = files;
stbuf->f_ffree = ffree;
stbuf->f_favail = favail;
stbuf->f_namemax = namemax;
return 0;
}
static int buf_get_entries(struct buffer *buf, void *dbuf,
fuse_fill_dir_t filler)
{
uint32_t count;
unsigned i;
if (buf_get_uint32(buf, &count) == -1)
return -EIO;
for (i = 0; i < count; i++) {
int err = -1;
char *name;
char *longname;
struct stat stbuf;
if (buf_get_string(buf, &name) == -1)
return -EIO;
if (buf_get_string(buf, &longname) != -1) {
free(longname);
err = buf_get_attrs(buf, &stbuf, NULL);
if (!err) {
if (sshfs.follow_symlinks &&
S_ISLNK(stbuf.st_mode)) {
stbuf.st_mode = 0;
}
filler(dbuf, name, &stbuf, 0, 0);
}
}
free(name);
if (err)
return err;
}
return 0;
}
static void ssh_add_arg(const char *arg)
{
if (fuse_opt_add_arg(&sshfs.ssh_args, arg) == -1)