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sshfs.c
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sshfs.c
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/*
SSH file system
Copyright (C) 2004 Miklos Szeredi <[email protected]>
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 <sys/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
#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
/* [email protected] f_flag flags */
#define SSH2_FXE_STATVFS_ST_RDONLY 0x00000001
#define SSH2_FXE_STATVFS_ST_NOSUID 0x00000002
#define SFTP_EXT_POSIX_RENAME "[email protected]"
#define SFTP_EXT_STATVFS "[email protected]"
#define SFTP_EXT_HARDLINK "[email protected]"
#define SFTP_EXT_FSYNC "[email protected]"
#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
#ifdef __APPLE__
static char sshfs_program_path[PATH_MAX] = { 0 };
#endif /* __APPLE__ */
struct buffer {
uint8_t *p;
size_t len;
size_t size;
};
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 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;
int connver;
int modifver;
int refs;
};
struct sshfs {
char *directport;
char *ssh_command;
char *sftp_server;
struct fuse_args ssh_args;
char *workarounds;
int rename_workaround;
int truncate_workaround;
int buflimit_workaround;
int unrel_append;
int fstat_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 debug;
int foreground;
int reconnect;
int delay_connect;
int slave;
char *host;
char *base_path;
GHashTable *reqtab;
pthread_mutex_t lock;
pthread_mutex_t lock_write;
int processing_thread_started;
unsigned int randseed;
int rfd;
int wfd;
int ptyfd;
int ptyslavefd;
int connver;
int server_version;
unsigned remote_uid;
unsigned local_uid;
#ifdef __APPLE__
unsigned remote_gid;
unsigned local_gid;
#endif
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",
"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("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", slave, 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("-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("-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("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),
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);
}
}
#ifdef __APPLE__
if (sshfs.remote_uid_detected) {
if (uid == sshfs.remote_uid)
uid = sshfs.local_uid;
if (gid == sshfs.remote_gid)
gid = sshfs.local_gid;
}
#else /* !__APPLE__ */
if (sshfs.remote_uid_detected && uid == sshfs.remote_uid)
uid = sshfs.local_uid;
#endif /* __APPLE__ */
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)
_exit(1);
}
static int pty_expect_loop(void)
{
int res;
char buf[256];
const char *passwd_str = "assword:";
int timeout = 60 * 1000; /* 1min timeout for the prompt to appear */
int passwd_len = strlen(passwd_str);
int len = 0;
char c;
while (1) {
struct pollfd fds[2];
fds[0].fd = sshfs.rfd;
fds[0].events = POLLIN;
fds[1].fd = sshfs.ptyfd;
fds[1].events = POLLIN;
res = poll(fds, 2, timeout);
if (res == -1) {
perror("poll");
return -1;
}
if (res == 0) {
fprintf(stderr, "Timeout waiting for prompt\n");
return -1;
}
if (fds[0].revents) {
/*
* Something happened on stdout of ssh, this
* either means, that we are connected, or
* that we are disconnected. In any case the
* password doesn't matter any more.
*/
break;
}
res = read(sshfs.ptyfd, &c, 1);
if (res == -1) {
perror("read");
return -1;
}
if (res == 0) {
fprintf(stderr, "EOF while waiting for prompt\n");
return -1;
}
buf[len] = c;
len++;
if (len == passwd_len) {
if (memcmp(buf, passwd_str, passwd_len) == 0) {
write(sshfs.ptyfd, sshfs.password,
strlen(sshfs.password));
}
memmove(buf, buf + 1, passwd_len - 1);
len--;
}
}
if (!sshfs.reconnect) {
size_t size = getpagesize();
memset(sshfs.password, 0, size);
munmap(sshfs.password, size);
sshfs.password = NULL;
}
return 0;
}
static int pty_master(char **name)
{
int mfd;
mfd = open("/dev/ptmx", O_RDWR | O_NOCTTY);
if (mfd == -1) {
perror("failed to open pty");
return -1;
}
if (grantpt(mfd) != 0) {
perror("grantpt");
return -1;
}
if (unlockpt(mfd) != 0) {
perror("unlockpt");
return -1;
}
*name = ptsname(mfd);
return mfd;
}
static void replace_arg(char **argp, const char *newarg)
{
free(*argp);
*argp = strdup(newarg);
if (*argp == NULL) {
fprintf(stderr, "sshfs: memory allocation failed\n");
abort();
}
}