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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.
*/
#include "config.h"
#include <fuse.h>
#include <fuse_opt.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <semaphore.h>
#include <pthread.h>
#include <netdb.h>
#include <signal.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/utsname.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <glib.h>
#include "cache.h"
#if FUSE_VERSION >= 23
#define SSHFS_USE_INIT
#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
#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"
#define SSHNODELAY_SO "sshnodelay.so"
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;
int replied;
int error;
struct buffer reply;
struct timeval start;
void *data;
request_func end_func;
struct list_head list;
};
struct read_chunk {
sem_t ready;
off_t offset;
size_t size;
struct buffer data;
int refs;
int res;
long modifver;
};
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;
};
struct sshfs {
char *directport;
char *ssh_command;
char *sftp_server;
struct fuse_args ssh_args;
char *workarounds;
int rename_workaround;
int nodelay_workaround;
int truncate_workaround;
int transform_symlinks;
int detect_uid;
unsigned max_read;
unsigned ssh_ver;
int sync_write;
int sync_read;
int debug;
int reconnect;
char *host;
char *base_path;
GHashTable *reqtab;
pthread_mutex_t lock;
pthread_mutex_t lock_write;
int processing_thread_started;
unsigned int randseed;
int infd;
int outfd;
int connver;
int server_version;
unsigned remote_uid;
unsigned local_uid;
int remote_uid_detected;
unsigned blksize;
char *progname;
long modifver;
};
static struct sshfs sshfs;
static const char *ssh_opts[] = {
"AddressFamily",
"BatchMode",
"BindAddress",
"ChallengeResponseAuthentication",
"CheckHostIP",
"Cipher",
"Ciphers",
"Compression",
"CompressionLevel",
"ConnectionAttempts",
"ConnectTimeout",
"GlobalKnownHostsFile",
"GSSAPIAuthentication",
"GSSAPIDelegateCredentials",
"HostbasedAuthentication",
"HostKeyAlgorithms",
"HostKeyAlias",
"HostName",
"IdentityFile",
"IdentitiesOnly",
"LogLevel",
"MACs",
"NoHostAuthenticationForLocalhost",
"NumberOfPasswordPrompts",
"PasswordAuthentication",
"Port",
"PreferredAuthentications",
"ProxyCommand",
"PubkeyAuthentication",
"RhostsRSAAuthentication",
"RSAAuthentication",
"ServerAliveInterval",
"ServerAliveCountMax",
"SmartcardDevice",
"StrictHostKeyChecking",
"TCPKeepAlive",
"UsePrivilegedPort",
"UserKnownHostsFile",
"VerifyHostKeyDNS",
NULL,
};
enum {
KEY_PORT,
KEY_COMPRESS,
KEY_HELP,
KEY_VERSION,
};
#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("ssh_protocol=%u", ssh_ver, 0),
SSHFS_OPT("-1", ssh_ver, 1),
SSHFS_OPT("workaround=%s", workarounds, 0),
SSHFS_OPT("idmap=none", detect_uid, 0),
SSHFS_OPT("idmap=user", detect_uid, 1),
SSHFS_OPT("sshfs_sync", sync_write, 1),
SSHFS_OPT("no_readahead", sync_read, 1),
SSHFS_OPT("sshfs_debug", debug, 1),
SSHFS_OPT("reconnect", reconnect, 1),
SSHFS_OPT("transform_symlinks", transform_symlinks, 1),
FUSE_OPT_KEY("-p ", KEY_PORT),
FUSE_OPT_KEY("-C", KEY_COMPRESS),
FUSE_OPT_KEY("-V", KEY_VERSION),
FUSE_OPT_KEY("--version", KEY_VERSION),
FUSE_OPT_KEY("-h", KEY_HELP),
FUSE_OPT_KEY("--help", KEY_HELP),
FUSE_OPT_END
};
static struct fuse_opt workaround_opts[] = {
SSHFS_OPT("none", rename_workaround, 0),
SSHFS_OPT("none", nodelay_workaround, 0),
SSHFS_OPT("none", truncate_workaround, 0),
SSHFS_OPT("all", rename_workaround, 1),
SSHFS_OPT("all", nodelay_workaround, 1),
SSHFS_OPT("all", truncate_workaround, 1),
SSHFS_OPT("rename", rename_workaround, 1),
SSHFS_OPT("norename", rename_workaround, 0),
SSHFS_OPT("nodelay", nodelay_workaround, 1),
SSHFS_OPT("nonodelay", nodelay_workaround, 0),
SSHFS_OPT("truncate", truncate_workaround, 1),
SSHFS_OPT("notruncate", truncate_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;
}
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");
exit(1);
}
} 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");
exit(1);
}
}
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 =
g_strdup_printf("%s%s", sshfs.base_path, path[1] ? path+1 : ".");
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 -1;
if (flagsp)
*flagsp = flags;
if ((flags & SSH_FILEXFER_ATTR_SIZE) &&
buf_get_uint64(buf, &size) == -1)
return -1;
if ((flags & SSH_FILEXFER_ATTR_UIDGID) &&
(buf_get_uint32(buf, &uid) == -1 ||
buf_get_uint32(buf, &gid) == -1))
return -1;
if ((flags & SSH_FILEXFER_ATTR_PERMISSIONS) &&
buf_get_uint32(buf, &mode) == -1)
return -1;
if ((flags & SSH_FILEXFER_ATTR_ACMODTIME)) {
if (buf_get_uint32(buf, &atime) == -1 ||
buf_get_uint32(buf, &mtime) == -1)
return -1;
}
if ((flags & SSH_FILEXFER_ATTR_EXTENDED)) {
uint32_t extcount;
unsigned i;
if (buf_get_uint32(buf, &extcount) == -1)
return -1;
for (i = 0; i < extcount; i++) {
struct buffer tmp;
if (buf_get_data(buf, &tmp) == -1)
return -1;
buf_free(&tmp);
if (buf_get_data(buf, &tmp) == -1)
return -1;
buf_free(&tmp);
}
}
if (sshfs.remote_uid_detected && uid == sshfs.remote_uid)
uid = sshfs.local_uid;
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) & ~(sshfs.blksize - 1)) >> 9;
}
stbuf->st_uid = uid;
stbuf->st_gid = gid;
stbuf->st_atime = atime;
stbuf->st_mtime = mtime;
return 0;
}
static int buf_get_entries(struct buffer *buf, fuse_cache_dirh_t h,
fuse_cache_dirfil_t filler)
{
uint32_t count;
unsigned i;
if (buf_get_uint32(buf, &count) == -1)
return -1;
for (i = 0; i < count; i++) {
int err = -1;
char *name;
char *longname;
struct stat stbuf;
if (buf_get_string(buf, &name) == -1)
return -1;
if (buf_get_string(buf, &longname) != -1) {
free(longname);
if (buf_get_attrs(buf, &stbuf, NULL) != -1) {
filler(h, name, &stbuf);
err = 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 do_ssh_nodelay_workaround(void)
{
char *oldpreload = getenv("LD_PRELOAD");
char *newpreload;
char sopath[PATH_MAX];
int res;
snprintf(sopath, sizeof(sopath), "%s/%s", LIBDIR, SSHNODELAY_SO);
res = access(sopath, R_OK);
if (res == -1) {
char *s;
if (!realpath(sshfs.progname, sopath))
return -1;
s = strrchr(sopath, '/');
if (!s)
s = sopath;
else
s++;
if (s + strlen(SSHNODELAY_SO) >= sopath + sizeof(sopath))
return -1;
strcpy(s, SSHNODELAY_SO);
res = access(sopath, R_OK);
if (res == -1) {
fprintf(stderr, "sshfs: cannot find %s\n", SSHNODELAY_SO);
return -1;
}
}
newpreload = g_strdup_printf("%s%s%s",
oldpreload ? oldpreload : "",
oldpreload ? " " : "",
sopath);
if (!newpreload || setenv("LD_PRELOAD", newpreload, 1) == -1)
fprintf(stderr, "warning: failed set LD_PRELOAD for ssh nodelay workaround\n");
g_free(newpreload);
return 0;
}
static int start_ssh(void)
{
int inpipe[2];
int outpipe[2];
int pid;
if (pipe(inpipe) == -1 || pipe(outpipe) == -1) {
perror("failed to create pipe");
return -1;
}
sshfs.infd = inpipe[0];
sshfs.outfd = outpipe[1];
pid = fork();
if (pid == -1) {
perror("failed to fork");
return -1;
} else if (pid == 0) {
int devnull;
if (sshfs.nodelay_workaround && do_ssh_nodelay_workaround() == -1)
fprintf(stderr, "warning: ssh nodelay workaround disabled\n");
devnull = open("/dev/null", O_WRONLY);
if (dup2(outpipe[0], 0) == -1 || dup2(inpipe[1], 1) == -1) {
perror("failed to redirect input/output");
_exit(1);
}
if (!sshfs.debug && devnull != -1)
dup2(devnull, 2);
close(devnull);
close(inpipe[0]);
close(inpipe[1]);
close(outpipe[0]);
close(outpipe[1]);
switch (fork()) {
case -1:
perror("failed to fork");
_exit(1);
case 0:
break;
default:
_exit(0);
}
chdir("/");
execvp(sshfs.ssh_args.argv[0], sshfs.ssh_args.argv);
perror("execvp");
_exit(1);
}
waitpid(pid, NULL, 0);
close(inpipe[1]);
close(outpipe[0]);
return 0;
}
static int connect_to(char *host, char *port)
{
int err;
int sock;
int opt;
struct addrinfo *ai;
struct addrinfo hint;
memset(&hint, 0, sizeof(hint));
hint.ai_family = PF_INET;
hint.ai_socktype = SOCK_STREAM;
err = getaddrinfo(host, port, &hint, &ai);
if (err) {
fprintf(stderr, "failed to resolve %s:%s: %s\n", host, port,
gai_strerror(err));
return -1;
}
sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock == -1) {
perror("failed to create socket");
return -1;
}
err = connect(sock, ai->ai_addr, ai->ai_addrlen);
if (err == -1) {
perror("failed to connect");
return -1;
}
opt = 1;
err = setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
if (err == -1)
perror("warning: failed to set TCP_NODELAY");
freeaddrinfo(ai);
sshfs.infd = sock;
sshfs.outfd = sock;
return 0;
}
static int do_write(struct iovec *iov, size_t count)
{
int res;
while (count) {
res = writev(sshfs.outfd, iov, count);
if (res == -1) {
perror("write");
return -1;
} else if (res == 0) {
fprintf(stderr, "zero write\n");
return -1;
}
do {
if ((unsigned) res < iov->iov_len) {
iov->iov_len -= res;
iov->iov_base += res;
break;
} else {
res -= iov->iov_len;
count --;
iov ++;
}
} while(count);
}
return 0;
}
static uint32_t sftp_get_id(void)
{
static uint32_t idctr;
return idctr++;
}
static void buf_to_iov(const struct buffer *buf, struct iovec *iov)
{
iov->iov_base = buf->p;
iov->iov_len = buf->len;
}
static size_t iov_length(const struct iovec *iov, unsigned long nr_segs)
{
unsigned long seg;
size_t ret = 0;
for (seg = 0; seg < nr_segs; seg++)
ret += iov[seg].iov_len;
return ret;
}
#define SFTP_MAX_IOV 3
static int sftp_send_iov(uint8_t type, uint32_t id, struct iovec iov[],
size_t count)
{
int res;
struct buffer buf;
struct iovec iovout[SFTP_MAX_IOV];
unsigned i;
unsigned nout = 0;
assert(count <= SFTP_MAX_IOV - 1);
buf_init(&buf, 5);
buf_add_uint32(&buf, iov_length(iov, count) + 5);
buf_add_uint8(&buf, type);
buf_add_uint32(&buf, id);
buf_to_iov(&buf, &iovout[nout++]);
for (i = 0; i < count; i++)
iovout[nout++] = iov[i];
pthread_mutex_lock(&sshfs.lock_write);
res = do_write(iovout, nout);
pthread_mutex_unlock(&sshfs.lock_write);
buf_free(&buf);
return res;
}
static int do_read(struct buffer *buf)
{
int res;
uint8_t *p = buf->p;
size_t size = buf->size;
while (size) {
res = read(sshfs.infd, p, size);
if (res == -1) {
perror("read");
return -1;
} else if (res == 0) {
fprintf(stderr, "remote host has disconnected\n");
return -1;
}
size -= res;
p += res;
}
return 0;
}
static int sftp_read(uint8_t *type, struct buffer *buf)
{
int res;
struct buffer buf2;
uint32_t len;
buf_init(&buf2, 5);
res = do_read(&buf2);
if (res != -1) {
if (buf_get_uint32(&buf2, &len) == -1)
return -1;
if (len > MAX_REPLY_LEN) {
fprintf(stderr, "reply len too large: %u\n", len);
return -1;
}
if (buf_get_uint8(&buf2, type) == -1)
return -1;
buf_init(buf, len - 1);
res = do_read(buf);
}
buf_free(&buf2);
return res;
}
static void request_free(struct request *req)
{
buf_free(&req->reply);
sem_destroy(&req->ready);
g_free(req);
}
static void chunk_free(struct read_chunk *chunk)
{
buf_free(&chunk->data);
sem_destroy(&chunk->ready);
g_free(chunk);
}
static void chunk_put(struct read_chunk *chunk)
{
if (chunk) {
chunk->refs--;
if (!chunk->refs)
chunk_free(chunk);
}
}
static void chunk_put_locked(struct read_chunk *chunk)
{
pthread_mutex_lock(&sshfs.lock);
chunk_put(chunk);
pthread_mutex_unlock(&sshfs.lock);
}
static int clean_req(void *key_, struct request *req)
{
(void) key_;
req->error = -EIO;
if (req->want_reply)
sem_post(&req->ready);
else {
if (req->end_func)
req->end_func(req);
request_free(req);
}
return TRUE;
}
static void *process_requests(void *data_)
{
int res;
(void) data_;
while (1) {
struct buffer buf;
uint8_t type;
struct request *req;
uint32_t id;
buf_init(&buf, 0);
res = sftp_read(&type, &buf);
if (res == -1)
break;
if (buf_get_uint32(&buf, &id) == -1)
break;
pthread_mutex_lock(&sshfs.lock);
req = (struct request *) g_hash_table_lookup(sshfs.reqtab,
GUINT_TO_POINTER(id));
if (req == NULL)
fprintf(stderr, "request %i not found\n", id);
else
g_hash_table_remove(sshfs.reqtab, GUINT_TO_POINTER(id));
pthread_mutex_unlock(&sshfs.lock);
if (req != NULL) {
struct timeval now;
unsigned int difftime;
gettimeofday(&now, NULL);
difftime = (now.tv_sec - req->start.tv_sec) * 1000;
difftime += (now.tv_usec - req->start.tv_usec) / 1000;
DEBUG(" [%05i] %14s %8ubytes (%ims)\n", id, type_name(type),
(unsigned) buf.size + 5, difftime);
req->reply = buf;
req->reply_type = type;
req->replied = 1;
if (req->want_reply)
sem_post(&req->ready);
else {
if (req->end_func) {
pthread_mutex_lock(&sshfs.lock);
req->end_func(req);
pthread_mutex_unlock(&sshfs.lock);
}
request_free(req);
}
} else
buf_free(&buf);
}
if (!sshfs.reconnect) {
/* harakiri */
kill(getpid(), SIGTERM);
} else {
pthread_mutex_lock(&sshfs.lock);
sshfs.processing_thread_started = 0;
close(sshfs.infd);
sshfs.infd = -1;
close(sshfs.outfd);
sshfs.outfd = -1;
g_hash_table_foreach_remove(sshfs.reqtab, (GHRFunc) clean_req, NULL);
sshfs.connver ++;
pthread_mutex_unlock(&sshfs.lock);
}
return NULL;
}
static int sftp_init()
{
int res = -1;
uint8_t type;
uint32_t version;
struct buffer buf;
buf_init(&buf, 0);
if (sftp_send_iov(SSH_FXP_INIT, PROTO_VERSION, NULL, 0) == -1)
goto out;
if (sftp_read(&type, &buf) == -1)
goto out;
if (type != SSH_FXP_VERSION) {
fprintf(stderr, "protocol error\n");
goto out;
}
if (buf_get_uint32(&buf, &version) == -1)
goto out;
sshfs.server_version = version;
DEBUG("Server version: %i\n", sshfs.server_version);
if (version > PROTO_VERSION)
fprintf(stderr, "Warning: server uses version: %i, we support: %i\n",
version, PROTO_VERSION);
res = 0;
out:
buf_free(&buf);
return res;
}
static void sftp_detect_uid()
{
int flags;
uint32_t id = sftp_get_id();
uint32_t replid;
uint8_t type;
struct buffer buf;
struct stat stbuf;
struct iovec iov[1];
buf_init(&buf, 5);
buf_add_string(&buf, ".");
buf_to_iov(&buf, &iov[0]);
if (sftp_send_iov(SSH_FXP_STAT, id, iov, 1) == -1)
goto out;
buf_clear(&buf);
if (sftp_read(&type, &buf) == -1)
goto out;
if (type != SSH_FXP_ATTRS && type != SSH_FXP_STATUS) {
fprintf(stderr, "protocol error\n");
goto out;
}
if (buf_get_uint32(&buf, &replid) == -1)
goto out;
if (replid != id) {
fprintf(stderr, "bad reply ID\n");
goto out;
}
if (type == SSH_FXP_STATUS) {
uint32_t serr;
if (buf_get_uint32(&buf, &serr) == -1)
goto out;
fprintf(stderr, "failed to stat home directory (%i)\n", serr);
goto out;
}
if (buf_get_attrs(&buf, &stbuf, &flags) == -1)
goto out;
if (!(flags & SSH_FILEXFER_ATTR_UIDGID))
goto out;
sshfs.remote_uid = stbuf.st_uid;
sshfs.local_uid = getuid();
sshfs.remote_uid_detected = 1;
DEBUG("remote_uid = %i\n", sshfs.remote_uid);
out:
if (!sshfs.remote_uid_detected)
fprintf(stderr, "failed to detect remote user ID\n");
buf_free(&buf);
}
static int connect_remote(void)
{
int err;
if (sshfs.directport)
err = connect_to(sshfs.host, sshfs.directport);
else
err = start_ssh();
if (!err)
err = sftp_init();
return err;
}
static int start_processing_thread(void)
{
int err;
pthread_t thread_id;
sigset_t oldset;
sigset_t newset;
if (sshfs.processing_thread_started)
return 0;
if (sshfs.outfd == -1) {
err = connect_remote();
if (err)
return -EIO;
}
sigemptyset(&newset);
sigaddset(&newset, SIGTERM);
sigaddset(&newset, SIGINT);
sigaddset(&newset, SIGHUP);
sigaddset(&newset, SIGQUIT);
pthread_sigmask(SIG_BLOCK, &newset, &oldset);
err = pthread_create(&thread_id, NULL, process_requests, NULL);
if (err) {
fprintf(stderr, "failed to create thread: %s\n", strerror(err));
return -EIO;
}
pthread_detach(thread_id);
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
sshfs.processing_thread_started = 1;
return 0;
}
#ifdef SSHFS_USE_INIT
#if FUSE_VERSION >= 26
static void *sshfs_init(struct fuse_conn_info *conn)
#else
static void *sshfs_init(void)
#endif
{
#if FUSE_VERSION >= 26
/* Readahead should be done by kernel or sshfs but not both */
if (conn->async_read)
sshfs.sync_read = 1;
#endif
if (sshfs.detect_uid)
sftp_detect_uid();
start_processing_thread();
return NULL;
}
#endif
static int sftp_request_wait(struct request *req, uint8_t type,
uint8_t expect_type, struct buffer *outbuf)
{
int err;
if (req->error) {
err = req->error;
goto out;
}
sem_wait(&req->ready);
if (req->error) {
err = req->error;
goto out;
}
err = -EIO;
if (req->reply_type != expect_type && req->reply_type != SSH_FXP_STATUS) {
fprintf(stderr, "protocol error\n");
goto out;
}
if (req->reply_type == SSH_FXP_STATUS) {
uint32_t serr;
if (buf_get_uint32(&req->reply, &serr) == -1)
goto out;
switch (serr) {
case SSH_FX_OK:
if (expect_type == SSH_FXP_STATUS)
err = 0;
else
err = -EIO;
break;
case SSH_FX_EOF:
if (type == SSH_FXP_READ || type == SSH_FXP_READDIR)
err = MY_EOF;
else
err = -EIO;
break;
case SSH_FX_NO_SUCH_FILE: err = -ENOENT; break;
case SSH_FX_PERMISSION_DENIED: err = -EACCES; break;
case SSH_FX_FAILURE: err = -EPERM; break;
case SSH_FX_BAD_MESSAGE:
default: err = -EIO; break;
}
} else {
buf_init(outbuf, req->reply.size - req->reply.len);
buf_get_mem(&req->reply, outbuf->p, outbuf->size);
err = 0;
}
out:
if (req->end_func) {
pthread_mutex_lock(&sshfs.lock);
req->end_func(req);
pthread_mutex_unlock(&sshfs.lock);
}
request_free(req);
return err;
}
static int sftp_request_send(uint8_t type, struct iovec *iov, size_t count,
request_func begin_func, request_func end_func,
int want_reply, void *data,
struct request **reqp)
{
int err;
uint32_t id;
struct request *req = g_new0(struct request, 1);
req->want_reply = want_reply;
req->end_func = end_func;
req->data = data;
sem_init(&req->ready, 0, 0);
buf_init(&req->reply, 0);
pthread_mutex_lock(&sshfs.lock);
if (begin_func)
begin_func(req);
id = sftp_get_id();
err = start_processing_thread();
if (err) {
pthread_mutex_unlock(&sshfs.lock);
goto out;
}
g_hash_table_insert(sshfs.reqtab, GUINT_TO_POINTER(id), req);
gettimeofday(&req->start, NULL);
DEBUG("[%05i] %s\n", id, type_name(type));
pthread_mutex_unlock(&sshfs.lock);
err = -EIO;
if (sftp_send_iov(type, id, iov, count) == -1) {
pthread_mutex_lock(&sshfs.lock);
g_hash_table_remove(sshfs.reqtab, GUINT_TO_POINTER(id));
pthread_mutex_unlock(&sshfs.lock);
goto out;
}
if (want_reply)
*reqp = req;
return 0;
out:
req->error = err;
if (!want_reply)
sftp_request_wait(req, type, 0, NULL);
else
*reqp = req;
return err;
}
static int sftp_request_iov(uint8_t type, struct iovec *iov, size_t count,
uint8_t expect_type, struct buffer *outbuf)
{
struct request *req;
sftp_request_send(type, iov, count, NULL, NULL, expect_type, NULL, &req);
if (expect_type == 0)
return 0;
return sftp_request_wait(req, type, expect_type, outbuf);
}
static int sftp_request(uint8_t type, const struct buffer *buf,
uint8_t expect_type, struct buffer *outbuf)
{
struct iovec iov;
buf_to_iov(buf, &iov);
return sftp_request_iov(type, &iov, 1, expect_type, outbuf);
}
static int sshfs_getattr(const char *path, struct stat *stbuf)
{
int err;
struct buffer buf;
struct buffer outbuf;
buf_init(&buf, 0);
buf_add_path(&buf, path);
err = sftp_request(SSH_FXP_LSTAT, &buf, SSH_FXP_ATTRS, &outbuf);
if (!err) {
if (buf_get_attrs(&outbuf, stbuf, NULL) == -1)
err = -EIO;
buf_free(&outbuf);
}
buf_free(&buf);
return err;
}
static int count_components(const char *p)
{
int ctr;
for (; *p == '/'; p++);
for (ctr = 0; *p; ctr++) {
for (; *p && *p != '/'; p++);
for (; *p == '/'; p++);
}
return ctr;
}
static void strip_common(const char **sp, const char **tp)
{
const char *s = *sp;
const char *t = *tp;
do {
for (; *s == '/'; s++);
for (; *t == '/'; t++);
*tp = t;
*sp = s;
for (; *s == *t && *s && *s != '/'; s++, t++);
} while ((*s == *t && *s) || (!*s && *t == '/') || (*s == '/' && !*t));
}
static void transform_symlink(const char *path, char **linkp)
{
const char *l = *linkp;
const char *b = sshfs.base_path;
char *newlink;
char *s;
int dotdots;
int i;
if (l[0] != '/' || b[0] != '/')
return;
strip_common(&l, &b);
if (*b)
return;
strip_common(&l, &path);
dotdots = count_components(path);
if (!dotdots)
return;
dotdots--;
newlink = malloc(dotdots * 3 + strlen(l) + 2);
if (!newlink) {
fprintf(stderr, "sshfs: memory allocation failed\n");
exit(1);
}
for (s = newlink, i = 0; i < dotdots; i++, s += 3)
strcpy(s, "../");
if (l[0])
strcpy(s, l);
else if (!dotdots)
strcpy(s, ".");
else
s[0] = '\0';
free(*linkp);
*linkp = newlink;
}
static int sshfs_readlink(const char *path, char *linkbuf, size_t size)
{
int err;
struct buffer buf;
struct buffer name;
assert(size > 0);
if (sshfs.server_version < 3)
return -EPERM;
buf_init(&buf, 0);
buf_add_path(&buf, path);
err = sftp_request(SSH_FXP_READLINK, &buf, SSH_FXP_NAME, &name);
if (!err) {
uint32_t count;
char *link;
err = -EIO;
if(buf_get_uint32(&name, &count) != -1 && count == 1 &&
buf_get_string(&name, &link) != -1) {
if (sshfs.transform_symlinks)
transform_symlink(path, &link);
strncpy(linkbuf, link, size - 1);
linkbuf[size - 1] = '\0';
free(link);
err = 0;
}
buf_free(&name);
}
buf_free(&buf);
return err;
}
static int sshfs_getdir(const char *path, fuse_cache_dirh_t h,
fuse_cache_dirfil_t filler)
{
int err;
struct buffer buf;
struct buffer handle;
buf_init(&buf, 0);
buf_add_path(&buf, path);
err = sftp_request(SSH_FXP_OPENDIR, &buf, SSH_FXP_HANDLE, &handle);
if (!err) {
int err2;
buf_finish(&handle);
do {
struct buffer name;
err = sftp_request(SSH_FXP_READDIR, &handle, SSH_FXP_NAME, &name);
if (!err) {
if (buf_get_entries(&name, h, filler) == -1)
err = -EIO;
buf_free(&name);
}
} while (!err);
if (err == MY_EOF)
err = 0;
err2 = sftp_request(SSH_FXP_CLOSE, &handle, 0, NULL);
if (!err)
err = err2;
buf_free(&handle);
}
buf_free(&buf);
return err;
}
static int sshfs_mkdir(const char *path, mode_t mode)
{
int err;
struct buffer buf;
buf_init(&buf, 0);
buf_add_path(&buf, path);
buf_add_uint32(&buf, SSH_FILEXFER_ATTR_PERMISSIONS);
buf_add_uint32(&buf, mode);
err = sftp_request(SSH_FXP_MKDIR, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static int sshfs_mknod(const char *path, mode_t mode, dev_t rdev)
{
int err;
struct buffer buf;
struct buffer handle;
(void) rdev;
if ((mode & S_IFMT) != S_IFREG)
return -EPERM;
buf_init(&buf, 0);
buf_add_path(&buf, path);
buf_add_uint32(&buf, SSH_FXF_WRITE | SSH_FXF_CREAT | SSH_FXF_EXCL);
buf_add_uint32(&buf, SSH_FILEXFER_ATTR_PERMISSIONS);
buf_add_uint32(&buf, mode);
err = sftp_request(SSH_FXP_OPEN, &buf, SSH_FXP_HANDLE, &handle);
if (!err) {
int err2;
buf_finish(&handle);
err2 = sftp_request(SSH_FXP_CLOSE, &handle, SSH_FXP_STATUS, NULL);
if (!err)
err = err2;
buf_free(&handle);
}
buf_free(&buf);
return err;
}
static int sshfs_symlink(const char *from, const char *to)
{
int err;
struct buffer buf;
if (sshfs.server_version < 3)
return -EPERM;
/* openssh sftp server doesn't follow standard: link target and
link name are mixed up, so we must also be non-standard :( */
buf_init(&buf, 0);
buf_add_string(&buf, from);
buf_add_path(&buf, to);
err = sftp_request(SSH_FXP_SYMLINK, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static int sshfs_unlink(const char *path)
{
int err;
struct buffer buf;
buf_init(&buf, 0);
buf_add_path(&buf, path);
err = sftp_request(SSH_FXP_REMOVE, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static int sshfs_rmdir(const char *path)
{
int err;
struct buffer buf;
buf_init(&buf, 0);
buf_add_path(&buf, path);
err = sftp_request(SSH_FXP_RMDIR, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static int sshfs_do_rename(const char *from, const char *to)
{
int err;
struct buffer buf;
buf_init(&buf, 0);
buf_add_path(&buf, from);
buf_add_path(&buf, to);
err = sftp_request(SSH_FXP_RENAME, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static void random_string(char *str, int length)
{
int i;
for (i = 0; i < length; i++)
*str++ = (char)('0' + rand_r(&sshfs.randseed) % 10);
*str = '\0';
}
static int sshfs_rename(const char *from, const char *to)
{
int err;
err = sshfs_do_rename(from, to);
if (err == -EPERM && sshfs.rename_workaround) {
size_t tolen = strlen(to);
if (tolen + RENAME_TEMP_CHARS < PATH_MAX) {
int tmperr;
char totmp[PATH_MAX];
strcpy(totmp, to);
random_string(totmp + tolen, RENAME_TEMP_CHARS);
tmperr = sshfs_do_rename(to, totmp);
if (!tmperr) {
err = sshfs_do_rename(from, to);
if (!err)
err = sshfs_unlink(totmp);
else
sshfs_do_rename(totmp, to);
}
}
}
return err;
}
static int sshfs_chmod(const char *path, mode_t mode)
{
int err;
struct buffer buf;
buf_init(&buf, 0);
buf_add_path(&buf, path);
buf_add_uint32(&buf, SSH_FILEXFER_ATTR_PERMISSIONS);
buf_add_uint32(&buf, mode);
err = sftp_request(SSH_FXP_SETSTAT, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static int sshfs_chown(const char *path, uid_t uid, gid_t gid)
{
int err;
struct buffer buf;
buf_init(&buf, 0);
buf_add_path(&buf, path);
buf_add_uint32(&buf, SSH_FILEXFER_ATTR_UIDGID);
buf_add_uint32(&buf, uid);
buf_add_uint32(&buf, gid);
err = sftp_request(SSH_FXP_SETSTAT, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static int sshfs_truncate_workaround(const char *path, off_t size,
struct fuse_file_info *fi);
static int sshfs_truncate(const char *path, off_t size)
{
int err;
struct buffer buf;
sshfs.modifver ++;
if (size == 0 || sshfs.truncate_workaround)
return sshfs_truncate_workaround(path, size, NULL);
buf_init(&buf, 0);
buf_add_path(&buf, path);
buf_add_uint32(&buf, SSH_FILEXFER_ATTR_SIZE);
buf_add_uint64(&buf, size);
err = sftp_request(SSH_FXP_SETSTAT, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static int sshfs_utime(const char *path, struct utimbuf *ubuf)
{
int err;
struct buffer buf;
buf_init(&buf, 0);
buf_add_path(&buf, path);
buf_add_uint32(&buf, SSH_FILEXFER_ATTR_ACMODTIME);
buf_add_uint32(&buf, ubuf->actime);
buf_add_uint32(&buf, ubuf->modtime);
err = sftp_request(SSH_FXP_SETSTAT, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
static inline int sshfs_file_is_conn(struct sshfs_file *sf)
{
return sf->connver == sshfs.connver;
}
static int sshfs_open_common(const char *path, mode_t mode,
struct fuse_file_info *fi)
{
int err;
int err2;
struct buffer buf;
struct buffer outbuf;
struct stat stbuf;
struct sshfs_file *sf;
struct request *open_req;
uint32_t pflags = 0;
struct iovec iov;
if ((fi->flags & O_ACCMODE) == O_RDONLY)
pflags = SSH_FXF_READ;
else if((fi->flags & O_ACCMODE) == O_WRONLY)
pflags = SSH_FXF_WRITE;
else if ((fi->flags & O_ACCMODE) == O_RDWR)
pflags = SSH_FXF_READ | SSH_FXF_WRITE;
else
return -EINVAL;
if (fi->flags & O_CREAT)
pflags |= SSH_FXF_CREAT;
if (fi->flags & O_EXCL)
pflags |= SSH_FXF_EXCL;
if (fi->flags & O_TRUNC)
pflags |= SSH_FXF_TRUNC;
sf = g_new0(struct sshfs_file, 1);
list_init(&sf->write_reqs);
pthread_cond_init(&sf->write_finished, NULL);
/* Assume random read after open */
sf->is_seq = 0;
sf->next_pos = 0;
sf->modifver= sshfs.modifver;
sf->connver = sshfs.connver;
buf_init(&buf, 0);
buf_add_path(&buf, path);
buf_add_uint32(&buf, pflags);
buf_add_uint32(&buf, SSH_FILEXFER_ATTR_PERMISSIONS);
buf_add_uint32(&buf, mode);
buf_to_iov(&buf, &iov);
sftp_request_send(SSH_FXP_OPEN, &iov, 1, NULL, NULL, 1, NULL, &open_req);
buf_clear(&buf);
buf_add_path(&buf, path);
err2 = sftp_request(SSH_FXP_LSTAT, &buf, SSH_FXP_ATTRS, &outbuf);
if (!err2 && buf_get_attrs(&outbuf, &stbuf, NULL) == -1)
err2 = -EIO;
err = sftp_request_wait(open_req, SSH_FXP_OPEN, SSH_FXP_HANDLE,
&sf->handle);
if (!err && err2) {
buf_finish(&sf->handle);
sftp_request(SSH_FXP_CLOSE, &sf->handle, 0, NULL);
buf_free(&sf->handle);
err = err2;
}
if (!err) {
cache_add_attr(path, &stbuf);
buf_finish(&sf->handle);
fi->fh = (unsigned long) sf;
} else {
cache_invalidate(path);
g_free(sf);
}
buf_free(&buf);
return err;
}
static int sshfs_open(const char *path, struct fuse_file_info *fi)
{
return sshfs_open_common(path, 0, fi);
}
static inline struct sshfs_file *get_sshfs_file(struct fuse_file_info *fi)
{
return (struct sshfs_file *) (uintptr_t) fi->fh;
}
static int sshfs_flush(const char *path, struct fuse_file_info *fi)
{
int err;
struct sshfs_file *sf = get_sshfs_file(fi);
struct list_head write_reqs;
struct list_head *curr_list;
if (!sshfs_file_is_conn(sf))
return -EIO;
if (sshfs.sync_write)
return 0;
(void) path;
pthread_mutex_lock(&sshfs.lock);
if (!list_empty(&sf->write_reqs)) {
curr_list = sf->write_reqs.prev;
list_del(&sf->write_reqs);
list_init(&sf->write_reqs);
list_add(&write_reqs, curr_list);
while (!list_empty(&write_reqs))
pthread_cond_wait(&sf->write_finished, &sshfs.lock);
}
err = sf->write_error;
sf->write_error = 0;
pthread_mutex_unlock(&sshfs.lock);
return err;
}
static int sshfs_fsync(const char *path, int isdatasync,
struct fuse_file_info *fi)
{
(void) isdatasync;
return sshfs_flush(path, fi);
}
static int sshfs_release(const char *path, struct fuse_file_info *fi)
{
struct sshfs_file *sf = get_sshfs_file(fi);
struct buffer *handle = &sf->handle;
if (sshfs_file_is_conn(sf)) {
sshfs_flush(path, fi);
sftp_request(SSH_FXP_CLOSE, handle, 0, NULL);
}
buf_free(handle);
chunk_put_locked(sf->readahead);
g_free(sf);
return 0;
}
static int sshfs_sync_read(struct sshfs_file *sf, char *rbuf, size_t size,
off_t offset)
{
int err;
struct buffer buf;
struct buffer data;
struct buffer *handle = &sf->handle;
buf_init(&buf, 0);
buf_add_buf(&buf, handle);
buf_add_uint64(&buf, offset);
buf_add_uint32(&buf, size);
err = sftp_request(SSH_FXP_READ, &buf, SSH_FXP_DATA, &data);
if (!err) {
uint32_t retsize;
err = -EIO;
if (buf_get_uint32(&data, &retsize) != -1) {
if (retsize > size)
fprintf(stderr, "long read\n");
else {
buf_get_mem(&data, rbuf, retsize);
err = retsize;
}
}
buf_free(&data);
} else if (err == MY_EOF)
err = 0;
buf_free(&buf);
return err;
}
static void sshfs_read_end(struct request *req)
{
struct read_chunk *chunk = (struct read_chunk *) req->data;
if (req->error)
chunk->res = req->error;
else if (req->replied) {
chunk->res = -EIO;
if (req->reply_type == SSH_FXP_STATUS) {
uint32_t serr;
if (buf_get_uint32(&req->reply, &serr) != -1) {
if (serr == SSH_FX_EOF)
chunk->res = 0;
}
} else if (req->reply_type == SSH_FXP_DATA) {
uint32_t retsize;
if (buf_get_uint32(&req->reply, &retsize) != -1) {
if (retsize > chunk->size)
fprintf(stderr, "long read\n");
else {
chunk->res = retsize;
chunk->data = req->reply;
buf_init(&req->reply, 0);
}
}
} else
fprintf(stderr, "protocol error\n");
} else
chunk->res = -EIO;
sem_post(&chunk->ready);
chunk_put(chunk);
}
static void sshfs_read_begin(struct request *req)
{
struct read_chunk *chunk = (struct read_chunk *) req->data;
chunk->refs++;
}
static void sshfs_send_async_read(struct sshfs_file *sf,
struct read_chunk *chunk)
{
struct buffer buf;
struct buffer *handle = &sf->handle;
struct iovec iov;
buf_init(&buf, 0);
buf_add_buf(&buf, handle);
buf_add_uint64(&buf, chunk->offset);
buf_add_uint32(&buf, chunk->size);
buf_to_iov(&buf, &iov);
sftp_request_send(SSH_FXP_READ, &iov, 1, sshfs_read_begin, sshfs_read_end,
0, chunk, NULL);
buf_free(&buf);
}
static void submit_read(struct sshfs_file *sf, size_t size, off_t offset,
struct read_chunk **chunkp)
{
struct read_chunk *chunk = g_new0(struct read_chunk, 1);
sem_init(&chunk->ready, 0, 0);
buf_init(&chunk->data, 0);
chunk->offset = offset;
chunk->size = size;
chunk->refs = 1;
chunk->modifver = sshfs.modifver;
sshfs_send_async_read(sf, chunk);
pthread_mutex_lock(&sshfs.lock);
chunk_put(*chunkp);
*chunkp = chunk;
pthread_mutex_unlock(&sshfs.lock);
}
static int wait_chunk(struct read_chunk *chunk, char *buf, size_t size)
{
int res;
sem_wait(&chunk->ready);
res = chunk->res;
if (res > 0) {
if ((size_t) res > size)
res = size;
buf_get_mem(&chunk->data, buf, res);
chunk->offset += res;
chunk->size -= res;
chunk->res -= res;
}
sem_post(&chunk->ready);
chunk_put_locked(chunk);
return res;
}
static struct read_chunk *search_read_chunk(struct sshfs_file *sf, off_t offset)
{
struct read_chunk *ch = sf->readahead;
if (ch && ch->offset == offset && ch->modifver == sshfs.modifver) {
ch->refs++;
return ch;
} else
return NULL;
}
static int sshfs_async_read(struct sshfs_file *sf, char *rbuf, size_t size,
off_t offset)
{
int res = 0;
size_t total = 0;
struct read_chunk *chunk;
struct read_chunk *chunk_prev = NULL;
size_t origsize = size;
int curr_is_seq;
pthread_mutex_lock(&sshfs.lock);
curr_is_seq = sf->is_seq;
sf->is_seq = (sf->next_pos == offset && sf->modifver == sshfs.modifver);
sf->next_pos = offset + size;
sf->modifver = sshfs.modifver;
chunk = search_read_chunk(sf, offset);
pthread_mutex_unlock(&sshfs.lock);
if (chunk && chunk->size < size) {
chunk_prev = chunk;
size -= chunk->size;
offset += chunk->size;
chunk = NULL;
}
if (!chunk)
submit_read(sf, size, offset, &chunk);
if (curr_is_seq && chunk && chunk->size <= size)
submit_read(sf, origsize, offset + size, &sf->readahead);
if (chunk_prev) {
size_t prev_size = chunk_prev->size;
res = wait_chunk(chunk_prev, rbuf, prev_size);
if (res < (int) prev_size) {
chunk_put_locked(chunk);
return res;
}
rbuf += res;
total += res;
}
res = wait_chunk(chunk, rbuf, size);
if (res > 0)
total += res;
if (res < 0)
return res;
return total;
}
static int sshfs_read(const char *path, char *rbuf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
struct sshfs_file *sf = get_sshfs_file(fi);
(void) path;
if (!sshfs_file_is_conn(sf))
return -EIO;
if (sshfs.sync_read)
return sshfs_sync_read(sf, rbuf, size, offset);
else
return sshfs_async_read(sf, rbuf, size, offset);
}
static void sshfs_write_begin(struct request *req)
{
struct sshfs_file *sf = (struct sshfs_file *) req->data;
list_add(&req->list, &sf->write_reqs);
}
static void sshfs_write_end(struct request *req)
{
uint32_t serr;
struct sshfs_file *sf = (struct sshfs_file *) req->data;
if (req->error)
sf->write_error = req->error;
else if (req->replied) {
if (req->reply_type != SSH_FXP_STATUS)
fprintf(stderr, "protocol error\n");
else if (buf_get_uint32(&req->reply, &serr) != -1 && serr != SSH_FX_OK)
sf->write_error = -EIO;
}
list_del(&req->list);
pthread_cond_broadcast(&sf->write_finished);
}
static int sshfs_write(const char *path, const char *wbuf, size_t size,
off_t offset, struct fuse_file_info *fi)
{
int err;
struct buffer buf;
struct sshfs_file *sf = get_sshfs_file(fi);
struct buffer *handle = &sf->handle;
struct iovec iov[2];
(void) path;
if (!sshfs_file_is_conn(sf))
return -EIO;
sshfs.modifver ++;
buf_init(&buf, 0);
buf_add_buf(&buf, handle);
buf_add_uint64(&buf, offset);
buf_add_uint32(&buf, size);
buf_to_iov(&buf, &iov[0]);
iov[1].iov_base = (void *) wbuf;
iov[1].iov_len = size;
if (!sshfs.sync_write && !sf->write_error)
err = sftp_request_send(SSH_FXP_WRITE, iov, 2, sshfs_write_begin,
sshfs_write_end, 0, sf, NULL);
else
err = sftp_request_iov(SSH_FXP_WRITE, iov, 2, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err ? err : (int) size;
}
#if FUSE_VERSION >= 25
static int sshfs_statfs(const char *path, struct statvfs *buf)
{
(void) path;
buf->f_namemax = 255;
buf->f_bsize = sshfs.blksize;
buf->f_frsize = 512;
buf->f_blocks = 999999999 * 2;
buf->f_bfree = 999999999 * 2;
buf->f_bavail = 999999999 * 2;
buf->f_files = 999999999;
buf->f_ffree = 999999999;
return 0;
}
#else
static int sshfs_statfs(const char *path, struct statfs *buf)
{
(void) path;
buf->f_namelen = 255;
buf->f_bsize = 512;
buf->f_blocks = 999999999 * 2;
buf->f_bfree = 999999999 * 2;
buf->f_bavail = 999999999 * 2;
buf->f_files = 999999999;
buf->f_ffree = 999999999;
return 0;
}
#endif
#if FUSE_VERSION >= 25
static int sshfs_create(const char *path, mode_t mode,
struct fuse_file_info *fi)
{
return sshfs_open_common(path, mode, fi);
}
static int sshfs_ftruncate(const char *path, off_t size,
struct fuse_file_info *fi)
{
int err;
struct buffer buf;
struct sshfs_file *sf = get_sshfs_file(fi);
(void) path;
if (!sshfs_file_is_conn(sf))
return -EIO;
sshfs.modifver ++;
if (sshfs.truncate_workaround)
return sshfs_truncate_workaround(path, size, fi);
buf_init(&buf, 0);
buf_add_buf(&buf, &sf->handle);
buf_add_uint32(&buf, SSH_FILEXFER_ATTR_SIZE);
buf_add_uint64(&buf, size);
err = sftp_request(SSH_FXP_FSETSTAT, &buf, SSH_FXP_STATUS, NULL);
buf_free(&buf);
return err;
}
#endif
static int sshfs_fgetattr(const char *path, struct stat *stbuf,
struct fuse_file_info *fi)
{
int err;
struct buffer buf;
struct buffer outbuf;
struct sshfs_file *sf = get_sshfs_file(fi);
(void) path;
if (!sshfs_file_is_conn(sf))
return -EIO;
buf_init(&buf, 0);
buf_add_buf(&buf, &sf->handle);
err = sftp_request(SSH_FXP_FSTAT, &buf, SSH_FXP_ATTRS, &outbuf);
if (!err) {
if (buf_get_attrs(&outbuf, stbuf, NULL) == -1)
err = -EIO;
buf_free(&outbuf);
}
buf_free(&buf);
return err;
}
static int sshfs_truncate_zero(const char *path)
{
int err;
struct fuse_file_info fi;
fi.flags = O_WRONLY | O_TRUNC;
err = sshfs_open(path, &fi);
if (!err)
sshfs_release(path, &fi);
return err;
}
static size_t calc_buf_size(off_t size, off_t offset)
{
return offset + sshfs.max_read < size ? sshfs.max_read : size - offset;
}
static int sshfs_truncate_shrink(const char *path, off_t size)
{
int res;
char *data;
off_t offset;
struct fuse_file_info fi;
data = calloc(size, 1);
if (!data)
return -ENOMEM;
fi.flags = O_RDONLY;
res = sshfs_open(path, &fi);
if (res)
goto out;
for (offset = 0; offset < size; offset += res) {
size_t bufsize = calc_buf_size(size, offset);
res = sshfs_read(path, data + offset, bufsize, offset, &fi);
if (res <= 0)
break;
}
sshfs_release(path, &fi);
if (res < 0)
goto out;
fi.flags = O_WRONLY | O_TRUNC;
res = sshfs_open(path, &fi);
if (res)
goto out;
for (offset = 0; offset < size; offset += res) {
size_t bufsize = calc_buf_size(size, offset);
res = sshfs_write(path, data + offset, bufsize, offset, &fi);
if (res < 0)
break;
}
if (res >= 0)
res = sshfs_flush(path, &fi);
sshfs_release(path, &fi);
out:
free(data);
return res;
}
static int sshfs_truncate_extend(const char *path, off_t size,
struct fuse_file_info *fi)
{
int res;
char c = 0;
struct fuse_file_info tmpfi;
struct fuse_file_info *openfi = fi;
if (!fi) {
openfi = &tmpfi;
openfi->flags = O_WRONLY;
res = sshfs_open(path, openfi);
if (res)
return res;
}
res = sshfs_write(path, &c, 1, size - 1, openfi);
if (res == 1)
res = sshfs_flush(path, openfi);
if (!fi)
sshfs_release(path, openfi);
return res;
}
/*
* Work around broken sftp servers which don't handle
* SSH_FILEXFER_ATTR_SIZE in SETSTAT request.
*
* If new size is zero, just open the file with O_TRUNC.
*
* If new size is smaller than current size, then copy file locally,
* then open/trunc and send it back.
*
* If new size is greater than current size, then write a zero byte to
* the new end of the file.
*/
static int sshfs_truncate_workaround(const char *path, off_t size,
struct fuse_file_info *fi)
{
if (size == 0)
return sshfs_truncate_zero(path);
else {
struct stat stbuf;
int err;
if (fi)
err = sshfs_fgetattr(path, &stbuf, fi);
else
err = sshfs_getattr(path, &stbuf);
if (err)
return err;
if (stbuf.st_size == size)
return 0;
else if (stbuf.st_size > size)
return sshfs_truncate_shrink(path, size);
else
return sshfs_truncate_extend(path, size, fi);
}
}
static int processing_init(void)
{
pthread_mutex_init(&sshfs.lock, NULL);
pthread_mutex_init(&sshfs.lock_write, NULL);
sshfs.reqtab = g_hash_table_new(NULL, NULL);
if (!sshfs.reqtab) {
fprintf(stderr, "failed to create hash table\n");
return -1;
}
return 0;
}
static struct fuse_cache_operations sshfs_oper = {
.oper = {
#ifdef SSHFS_USE_INIT
.init = sshfs_init,
#endif
.getattr = sshfs_getattr,
.readlink = sshfs_readlink,
.mknod = sshfs_mknod,
.mkdir = sshfs_mkdir,
.symlink = sshfs_symlink,
.unlink = sshfs_unlink,
.rmdir = sshfs_rmdir,
.rename = sshfs_rename,
.chmod = sshfs_chmod,
.chown = sshfs_chown,
.truncate = sshfs_truncate,
.utime = sshfs_utime,
.open = sshfs_open,
.flush = sshfs_flush,
.fsync = sshfs_fsync,
.release = sshfs_release,
.read = sshfs_read,
.write = sshfs_write,
.statfs = sshfs_statfs,
#if FUSE_VERSION >= 25
.create = sshfs_create,
.ftruncate = sshfs_ftruncate,
.fgetattr = sshfs_fgetattr,
#endif
},
.cache_getdir = sshfs_getdir,
};
static void usage(const char *progname)
{
fprintf(stderr,
"usage: %s [user@]host:[dir] mountpoint [options]\n"
"\n"
"general options:\n"
" -o opt,[opt...] mount options\n"
" -h --help print help\n"
" -V --version print version\n"
"\n"
"SSHFS options:\n"
" -p PORT equivalent to '-o port=PORT'\n"
" -C equivalent to '-o compression=yes'\n"
" -1 equivalent to '-o ssh_protocol=1'\n"
" -o reconnect reconnect to server\n"
" -o sshfs_sync synchronous writes\n"
" -o no_readahead synchronous reads (no speculative readahead)\n"
" -o sshfs_debug print some debugging information\n"
" -o cache=YESNO enable caching {yes,no} (default: yes)\n"
" -o cache_timeout=N sets timeout for caches in seconds (default: 20)\n"
" -o cache_X_timeout=N sets timeout for {stat,dir,link} cache\n"
" -o workaround=LIST colon separated list of workarounds\n"
" none no workarounds enabled\n"
" all all workarounds enabled\n"
" [no]rename fix renaming to existing file (default: off)\n"
" [no]nodelay set nodelay tcp flag in ssh (default: on)\n"
" [no]truncate fix truncate for old servers (default: off)\n"
" -o idmap=TYPE user/group ID mapping, possible types are:\n"
" none no translation of the ID space (default)\n"
" user only translate UID of connecting user\n"
" -o ssh_command=CMD execute CMD instead of 'ssh'\n"
" -o ssh_protocol=N ssh protocol to use (default: 2)\n"
" -o sftp_server=SERV path to sftp server or subsystem (default: sftp)\n"
" -o directport=PORT directly connect to PORT bypassing ssh\n"
" -o transform_symlinks transform absolute symlinks to relative\n"
" -o SSHOPT=VAL ssh options (see man ssh_config)\n"
"\n", progname);
}
static int is_ssh_opt(const char *arg)
{
if (arg[0] != '-') {
unsigned arglen = strlen(arg);
const char **o;
for (o = ssh_opts; *o; o++) {
unsigned olen = strlen(*o);
if (arglen > olen && arg[olen] == '=' &&
strncasecmp(arg, *o, olen) == 0)
return 1;
}
}
return 0;
}
static int sshfs_opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs)
{
char *tmp;
(void) data;
switch (key) {
case FUSE_OPT_KEY_OPT:
if (is_ssh_opt(arg)) {
tmp = g_strdup_printf("-o%s", arg);
ssh_add_arg(tmp);
g_free(tmp);
return 0;
}
return 1;
case FUSE_OPT_KEY_NONOPT:
if (!sshfs.host && strchr(arg, ':')) {
sshfs.host = strdup(arg);
return 0;
}
return 1;
case KEY_PORT:
tmp = g_strdup_printf("-oPort=%s", arg + 2);
ssh_add_arg(tmp);
g_free(tmp);
return 0;
case KEY_COMPRESS:
ssh_add_arg("-oCompression=yes");
return 0;
case KEY_HELP:
usage(outargs->argv[0]);
fuse_opt_add_arg(outargs, "-ho");
fuse_main(outargs->argc, outargs->argv, &sshfs_oper.oper);
exit(1);
case KEY_VERSION:
fprintf(stderr, "SSHFS version %s\n", PACKAGE_VERSION);
#if FUSE_VERSION >= 25
fuse_opt_add_arg(outargs, "--version");
fuse_main(outargs->argc, outargs->argv, &sshfs_oper.oper);
#endif
exit(0);
default:
fprintf(stderr, "internal error\n");
abort();
}
}
static int workaround_opt_proc(void *data, const char *arg, int key,
struct fuse_args *outargs)
{
(void) data; (void) key; (void) outargs;
fprintf(stderr, "unknown workaround: '%s'\n", arg);
return -1;
}
int parse_workarounds(void)
{
int res;
char *argv[] = { "", "-o", sshfs.workarounds, NULL };
struct fuse_args args = FUSE_ARGS_INIT(3, argv);
char *s = sshfs.workarounds;
if (!s)
return 0;
while ((s = strchr(s, ':')))
*s = ',';
res = fuse_opt_parse(&args, &sshfs, workaround_opts, workaround_opt_proc);
fuse_opt_free_args(&args);
return res;
}
#if FUSE_VERSION == 25
static int fuse_opt_insert_arg(struct fuse_args *args, int pos,
const char *arg)
{
assert(pos <= args->argc);
if (fuse_opt_add_arg(args, arg) == -1)
return -1;
if (pos != args->argc - 1) {
char *newarg = args->argv[args->argc - 1];
memmove(&args->argv[pos + 1], &args->argv[pos],
sizeof(char *) * (args->argc - pos - 1));
args->argv[pos] = newarg;
}
return 0;
}
#endif
void check_large_read(struct fuse_args *args)
{
struct utsname buf;
int err = uname(&buf);
if (!err && strcmp(buf.sysname, "Linux") == 0 &&
strncmp(buf.release, "2.4.", 4) == 0)
fuse_opt_insert_arg(args, 1, "-olarge_read");
}
int main(int argc, char *argv[])
{
int res;
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
char *tmp;
char *fsname;
char *base_path;
const char *sftp_server;
sshfs.blksize = 4096;
sshfs.max_read = 65536;
sshfs.nodelay_workaround = 1;
sshfs.rename_workaround = 0;
sshfs.truncate_workaround = 0;
sshfs.ssh_ver = 2;
sshfs.progname = argv[0];
ssh_add_arg("ssh");
ssh_add_arg("-x");
ssh_add_arg("-a");
ssh_add_arg("-oClearAllForwardings=yes");
if (fuse_opt_parse(&args, &sshfs, sshfs_opts, sshfs_opt_proc) == -1 ||
parse_workarounds() == -1)
exit(1);
if (!sshfs.host) {
fprintf(stderr, "missing host\n");
fprintf(stderr, "see `%s -h' for usage\n", argv[0]);
exit(1);
}
fsname = g_strdup(sshfs.host);
base_path = strchr(sshfs.host, ':');
*base_path++ = '\0';
if (base_path[0] && base_path[strlen(base_path)-1] != '/')
sshfs.base_path = g_strdup_printf("%s/", base_path);
else
sshfs.base_path = g_strdup(base_path);
if (sshfs.ssh_command) {
free(sshfs.ssh_args.argv[0]);
sshfs.ssh_args.argv[0] = sshfs.ssh_command;
}
tmp = g_strdup_printf("-%i", sshfs.ssh_ver);
ssh_add_arg(tmp);
g_free(tmp);
ssh_add_arg(sshfs.host);
if (sshfs.sftp_server)
sftp_server = sshfs.sftp_server;
else if (sshfs.ssh_ver == 1)
sftp_server = SFTP_SERVER_PATH;
else
sftp_server = "sftp";
if (sshfs.ssh_ver != 1 && strchr(sftp_server, '/') == NULL)
ssh_add_arg("-s");
ssh_add_arg(sftp_server);
free(sshfs.sftp_server);
res = processing_init();
if (res == -1)
exit(1);
if (connect_remote() == -1)
exit(1);
#ifndef SSHFS_USE_INIT
if (sshfs.detect_uid)
sftp_detect_uid();
#endif
res = cache_parse_options(&args);
if (res == -1)
exit(1);
sshfs.randseed = time(0);
if (sshfs.max_read > 65536)
sshfs.max_read = 65536;
if (fuse_is_lib_option("ac_attr_timeout="))
fuse_opt_insert_arg(&args, 1, "-oauto_cache,ac_attr_timeout=0");
tmp = g_strdup_printf("-omax_read=%u", sshfs.max_read);
fuse_opt_insert_arg(&args, 1, tmp);
g_free(tmp);
tmp = g_strdup_printf("-ofsname=sshfs#%s", fsname);
fuse_opt_insert_arg(&args, 1, tmp);
check_large_read(&args);
g_free(tmp);
g_free(fsname);
res = fuse_main(args.argc, args.argv, cache_init(&sshfs_oper));
fuse_opt_free_args(&args);
fuse_opt_free_args(&sshfs.ssh_args);
free(sshfs.directport);
return res;
}