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sftp.c
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sftp.c
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/*
$NiH: sftp.c,v 1.28 2005/06/03 11:56:16 wiz Exp $
sftp.c -- sftp protocol functions
Copyright (C) 2001, 2002 Dieter Baron
This file is part of cftp, a fullscreen ftp client
The author can be contacted at <dillo@giga.or.at>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. The name of the author may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#ifdef USE_SFTP
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "directory.h"
#include "display.h"
#include "ftp.h"
#include "methods.h"
#include "status.h"
#include "util.h"
#define SFTP_MAX_PACKET_SIZE 32*1024
#define SFTP_HEADER_LEN 9 /* length + type + id */
#define SFTP_DATA_HEADER_LEN SFTP_HEADER_LEN+4
/* no of bytes before data in a
SSH_FXP_DATA packet */
#define SFTP_DATA_LEN 8192 /* data length used for read/write */
#define SFTP_FL_LOG 0x1 /* log packet */
#define SFTP_FL_IS_PATH 0x2 /* string is path (prepend cwd) */
#define SFTP_FL_NONBLOCK 0x4 /* don't block in i/o */
#define SFTP_FL_CONT 0x8 /* continue with packet */
struct packet {
int type; /* packet type */
int id; /* packet id */
char *dat; /* packet data (starting after id) */
int plen; /* length of packet data */
int pn; /* number of bytes read/write */
};
struct handle {
int len;
char *str;
};
enum sftp_file_state {
SFTP_FS_EOF, SFTP_FS_ERROR, SFTP_FS_SEND, SFTP_FS_RECEIVE
};
struct sftp_file {
int flags;
struct handle *hnd; /* sftp handle */
off_t off; /* current offset within file */
enum sftp_file_state state;
/* current state */
int doff; /* offset to unreturned data */
int dend; /* end of data within current packet */
int woff; /* offset to length in write packet */
};
int sftp_file_close(struct handle *hnd);
struct handle *sftp_file_open(char *file, int flags);
struct handle *sftp_get_handle(void);
int sftp_put_handle(int type, struct handle *hnd, int flags);
int sftp_put_str(int type, char *str, int len, int flags);
int sftp_readdir(struct handle *hnd, struct packet *pkt, int flags);
int sftp_send_init(int proto_version);
int sftp_start_read(struct sftp_file *f, int nbytes);
int sftp_status(void);
static int _sftp_close(int st_valid, int status);
static int _sftp_get_packet(struct packet *p, int flags);
static char *_sftp_get_string(char *buf, char **endp);
static unsigned int _sftp_get_uint32(char *p, char **endp);
static unsigned long long _sftp_get_uint64(char *p, char **endp);
static void _sftp_log_handle(char *buf, char *data, char **endp);
static void _sftp_log_packet(int dir, struct packet *pkt);
static void _sftp_log_pflags(char *buf, char *data, char **endp);
static void _sftp_log_str(char *buf, char *data, char **endp);
static void _sftp_make_packet(struct packet *pkt, int type, char *end);
static int _sftp_parse_name(char *p, char **endp, direntry *e);
static int _sftp_parse_status(struct packet *pkt);
static void _sftp_put_handle(char *buf, char **endp, struct handle *hnd);
static int _sftp_put_packet(struct packet *pkt, int flags);
static void _sftp_put_string(char *buf, char **endp,
char *str, int slen, int flags);
static void _sftp_put_uint32(char *p, char **endp, unsigned int i);
static void _sftp_put_uint64(char *p, char **endp, unsigned long long i);
static int _sftp_read(int fd, void *buf, size_t nbytes, int flags);
static directory *_sftp_read_dir(struct handle *hnd);
static void _sftp_send_error_packet(char *fmt, ...);
static void _sftp_sig_child(int sig);
static void _sftp_start_ssh(int fdin, int fdout);
static int _sftp_start_write(struct sftp_file *f, int len);
static char *_sftp_strerror(int error);
static int _sftp_writev(int fd, struct iovec *iov, int niov, int flags);
#define SFTP_PROTO_VERSION 3
/* packet types */
#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_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
/* attribute flag bits */
#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
/* open pflags bits */
#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
/* error/status code definitions */
#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
static char _sftp_buffer[SFTP_MAX_PACKET_SIZE];
static struct packet _sftp_packet_s;
#define _sftp_packet (&_sftp_packet_s)
static char *_sftp_errlist[] = {
"OK",
"End of file",
"No such file or directory",
"Permission denied",
"Failure",
"Bad message",
"No connection",
"Connection lost",
"Operation unsupported"
};
static int _sftp_nerr = sizeof(_sftp_errlist) / sizeof(_sftp_errlist[0]);
static int _sftp_nextid; /* id to use in next packet */
static pid_t _sftp_ssh_pid; /* PID of ssh subprocess */
static int _conin, _conout; /* file descriptors to ssh subprocess */
/*
Implements mkdir method.
*/
int
sftp_mkdir(char *path)
{
sftp_put_str(SSH_FXP_MKDIR, path, 0, SFTP_FL_LOG|SFTP_FL_IS_PATH);
if (sftp_status() != SSH_FX_OK)
return -1;
return 0;
}
/*
Implements rmdir method.
*/
int
sftp_rmdir(char *path)
{
sftp_put_str(SSH_FXP_RMDIR, path, 0, SFTP_FL_LOG|SFTP_FL_IS_PATH);
if (sftp_status() != SSH_FX_OK)
return -1;
return 0;
}
/*
Implements list method.
*/
directory *
sftp_list(char *path)
{
directory *dir;
struct handle *hnd;
sftp_put_str(SSH_FXP_OPENDIR, path, 0, SFTP_FL_LOG|SFTP_FL_IS_PATH);
if ((hnd=sftp_get_handle()) == NULL)
return NULL;
dir = _sftp_read_dir(hnd);
if (dir)
dir->path = strdup(path);
sftp_file_close(hnd);
return dir;
}
static directory *
_sftp_read_dir(struct handle *hnd)
{
directory *dir;
direntry entry;
char *p;
time_t oldt, newt;
int n, pn;
dir = dir_new();
oldt = 0;
n = 0;
while (sftp_readdir(hnd, _sftp_packet, 0) == 0
&& _sftp_packet->type == SSH_FXP_NAME) {
pn = _sftp_get_uint32(_sftp_packet->dat, &p);
while (pn--) {
if (_sftp_parse_name(p, &p, &entry) == 0) {
if (strcmp(entry.name, ".") == 0
|| strcmp(entry.name, "..") == 0) {
free(entry.name);
free(entry.line);
continue;
}
dir_add(dir, &entry);
n++;
}
if ((newt=time(NULL)) != oldt) {
disp_status(DISP_STATUS, "listed %d", n);
oldt = newt;
}
}
}
if (_sftp_parse_status(_sftp_packet) != SSH_FX_EOF)
_sftp_log_packet(1, _sftp_packet);
return dir;
}
/*
Return string corresponding to error number ERROR. This is a static
string that remains valid until next call to _sftp_strerror.
*/
static char *
_sftp_strerror(int error)
{
static char buf[128];
if (error < 0 || error >= _sftp_nerr) {
sprintf(buf, "Unknown error %d", error);
return buf;
}
return _sftp_errlist[error];
}
/*
Read packet into P. Return -1 in case of error, 0 if packet is
complete, 1 if not completely read (non-blocking case).
*/
static int
_sftp_get_packet(struct packet *p, int flags)
{
int n, off;
char *cp;
if (_conin < 0)
return -1;
if (!(flags & SFTP_FL_CONT)) {
p->plen = 0;
p->pn = 0;
}
if (p->pn < SFTP_HEADER_LEN) {
/* read length and type */
if ((n=_sftp_read(_conin, p->dat+p->pn, SFTP_HEADER_LEN-p->pn,
flags)) < 0)
return -1;
p->pn += n;
if (p->pn < SFTP_HEADER_LEN)
return 1;
p->plen = _sftp_get_uint32(p->dat, &cp);
p->type = *(cp++);
p->id = _sftp_get_uint32(cp, &cp);
p->plen -= SFTP_HEADER_LEN - 4;
}
off = p->pn - SFTP_HEADER_LEN;
if ((n=_sftp_read(_conin, p->dat+off, p->plen-off, flags)) < 0)
return -1;
p->pn += n;
if (off+n < p->plen)
return 1;
if (flags & SFTP_FL_LOG)
_sftp_log_packet(1, p);
return 0;
}
static void
_sftp_log_packet(int dir, struct packet *pkt)
{
static char *req[] = {
"init %I",
"version %I",
"open %s %p %a",
"close %h",
"read %h @ %l + %i",
"write %h @ %l + %i",
"lstat %s",
"fstat %h",
"setstat, %s %a",
"fsetstat %h %a",
"opendir %s",
"readdir %h",
"remove %s",
"mkdir %s",
"rmdir %s",
"realpath %s",
"stat %s",
"rename %s %s"
};
static char *rsp[] = {
"status %m",
"handle %h",
"data %i",
"name %i %s",
"attrs %a"
};
static char *ext[] = {
"extended %s",
"extended-reply"
};
static char *dir_pre[] = { "-> ", "<= " };
char buf[8192], *fmt, *bp, *fp, *fq, *pp;
int n;
if (pkt->type >= SSH_FXP_INIT && pkt->type <= SSH_FXP_RENAME)
fmt = req[pkt->type-SSH_FXP_INIT];
else if (pkt->type >= SSH_FXP_STATUS && pkt->type <= SSH_FXP_ATTRS)
fmt = rsp[pkt->type-SSH_FXP_STATUS];
else if (pkt->type >= SSH_FXP_EXTENDED
&& pkt->type <= SSH_FXP_EXTENDED_REPLY) {
fmt = ext[pkt->type-SSH_FXP_EXTENDED];
}
else
fmt = "unknown packet type %t";
strcpy(buf, dir_pre[dir!=0]);
bp = buf+strlen(buf);
if (pkt->type != SSH_FXP_INIT && pkt->type != SSH_FXP_VERSION) {
sprintf(bp, "[%d] ", pkt->id);
bp += strlen(bp);
}
/* XXX: check for buf overrun */
fp=fmt;
pp = pkt->dat;
while ((fq=strchr(fp, '%'))) {
n = fq-fp;
if (n) {
strncpy(bp, fp, n);
bp += n;
}
switch (fq[1]) {
case 'a':
*bp = '\0';
break;
case 'h':
_sftp_log_handle(bp, pp, &pp);
break;
case 'I':
sprintf(bp, "%i", pkt->id);
break;
case 'i':
sprintf(bp, "%u", _sftp_get_uint32(pp, &pp));
break;
case 'l':
pp += 8;
break;
case 'm':
strcpy(bp, _sftp_strerror(_sftp_get_uint32(pp, &pp)));
break;
case 'p':
_sftp_log_pflags(bp, pp, &pp);
break;
case 's':
_sftp_log_str(bp, pp, &pp);
break;
case 'T':
sprintf(bp, "%u", pkt->type);
break;
default:
bp[0] = '%';
bp[1] = fq[1];
break;
}
fp = fq+2;
bp += strlen(bp);
}
strcpy(bp, fp);
disp_status(DISP_PROTO, "%s", buf);
if (pkt->type == SSH_FXP_INIT || pkt->type == SSH_FXP_VERSION) {
bp = buf+3;
while (pp < pkt->dat+pkt->plen) {
_sftp_log_str(bp, pp, &pp);
disp_status(DISP_HIST, "%s", buf);
pp += _sftp_get_uint32(pp, NULL) + 4;
}
}
}
static int
_sftp_parse_name(char *p, char **endp, direntry *e)
{
unsigned int flags;
int n, len;
mode_t mode;
e->name = _sftp_get_string(p, &p);
len = _sftp_get_uint32(p, &p);
e->line = malloc(len+2);
e->line[0] = ' ';
strncpy(e->line+1, p, len);
e->line[len+1] = '\0';
p += len;
e->link = NULL;
flags = _sftp_get_uint32(p, &p);
if (flags & SSH_FILEXFER_ATTR_SIZE) {
e->size = _sftp_get_uint64(p, &p);
}
else
e->size = -1;
if (flags & SSH_FILEXFER_ATTR_UIDGID)
p += 8;
if (flags & SSH_FILEXFER_ATTR_PERMISSIONS) {
mode = _sftp_get_uint32(p, &p);
switch (mode & S_IFMT) {
case S_IFDIR:
e->type = 'd';
break;
case S_IFREG:
case S_IFIFO:
e->type = 'f';
break;
case S_IFLNK:
e->type = 'l';
break;
default:
e->type = 'x';
}
}
else
e->type = 'x';
if (flags & SSH_FILEXFER_ATTR_ACMODTIME) {
p += 4; /* skip atime */
e->mtime = _sftp_get_uint32(p, &p);
}
else
e->mtime = 0;
if (flags & SSH_FILEXFER_ATTR_EXTENDED) {
n = _sftp_get_uint32(p, &p);
while (n--) {
p += _sftp_get_uint32(p, NULL) + 4;
p += _sftp_get_uint32(p, NULL) + 4;
}
}
if (endp)
*endp = p;
return 0;
}
/*
Return uint32 at P. If END is non-NULL, point *END to next byte to
be processed.
*/
static unsigned int
_sftp_get_uint32(char *p, char **end)
{
unsigned char *up;
if (end)
*end = p+4;
up = (unsigned char *)p;
return (up[0]<<24) | (up[1]<<16) | (up[2]<<8) | up[3];
}
/*
Return uint64 at P. If END is non-NULL, point *END to next byte to
be processed.
*/
static unsigned long long
_sftp_get_uint64(char *p, char **end)
{
unsigned char *up;
if (end)
*end = p+8;
up = (unsigned char *)p;
return ((unsigned long long)up[0]<<56) | ((unsigned long long)up[1]<<48)
| ((unsigned long long)up[2]<<40) | ((unsigned long long)up[3]<<32)
| (up[4]<<24) | (up[5]<<16) | (up[6]<<8) | up[7];
}
/*
Return string at P (malloc()ed, NUL-terminated. If END is non-NULL,
point *END to next byte to be processed.
*/
static char *
_sftp_get_string(char *buf, char **endp)
{
char *s, *p;
int len;
len = _sftp_get_uint32(buf, &p);
if (!len)
return NULL;
if ((s=malloc(len+1)) == NULL)
return NULL;
memcpy(s, p, len);
s[len] = '\0';
if (endp)
*endp = p+len;
return s;
}
/*
Read status packet and return status code. If packet read is not a
status packet, or if an error occurs, return -1.
*/
int
sftp_status(void)
{
if (_sftp_get_packet(_sftp_packet, SFTP_FL_LOG) < 0)
return -1;
return _sftp_parse_status(_sftp_packet);
}
/*
Return status code from status packet. If packet is not a status
packet, return -1.
*/
static int
_sftp_parse_status(struct packet *pkt)
{
if (pkt->type != SSH_FXP_STATUS || pkt->plen < 4)
return -1;
return _sftp_get_uint32(pkt->dat, NULL);
}
/*
Read handle packet and return handle. If packet read is not a
handle packet or if an error occurs, return NULL.
*/
struct handle *
sftp_get_handle(void)
{
struct handle *hnd;
char *p;
if (_sftp_get_packet(_sftp_packet, SFTP_FL_LOG) < 0
|| _sftp_packet->type != SSH_FXP_HANDLE)
return NULL;
hnd = malloc(sizeof(*hnd));
hnd->len = _sftp_get_uint32(_sftp_packet->dat, &p);
hnd->str = malloc(hnd->len);
memcpy(hnd->str, p, hnd->len);
return hnd;
}
/*
Close file associated with HND on server. Return status returned
from server.
*/
int
sftp_file_close(struct handle *hnd)
{
sftp_put_handle(SSH_FXP_CLOSE, hnd, SFTP_FL_LOG);
free(hnd->str);
free(hnd);
return sftp_status();
}
/*
Send a readdir request on HND, and read response into PKT. Return
value returned by _sftp_get_packet.
*/
int
sftp_readdir(struct handle *hnd, struct packet *pkt, int flags)
{
sftp_put_handle(SSH_FXP_READDIR, hnd, flags);
return _sftp_get_packet(pkt, flags);
}
/*
Send a packet of type TYPE, containing only string STR.
*/
int
sftp_put_str(int type, char *str, int slen, int flags)
{
char *p;
p = _sftp_packet->dat;
_sftp_put_string(p, &p, str, slen, flags);
_sftp_make_packet(_sftp_packet, type, p);
return _sftp_put_packet(_sftp_packet, flags&~SFTP_FL_CONT);
}
/*
Put unit32 I at P. If END is non-NULL, point *END to next byte to
be filled. */
static void
_sftp_put_uint32(char *p, char **end, unsigned int i)
{
unsigned char *q;
if (end)
*end = p+4;
q = (unsigned char *)p;
q[0] = (i>>24) & 0xff;
q[1] = (i>>16) & 0xff;
q[2] = (i>>8) & 0xff;
q[3] = i & 0xff;
}
/*
Put unit64 I at P. If END is non-NULL, point *END to next byte to
be filled.
*/
static void
_sftp_put_uint64(char *p, char **end, unsigned long long i)
{
unsigned char *q;
if (end)
*end = p+8;
q = (unsigned char *)p;
q[0] = (i>>56) & 0xff;
q[1] = (i>>48) & 0xff;
q[2] = (i>>40) & 0xff;
q[3] = (i>>32) & 0xff;
q[4] = (i>>24) & 0xff;
q[5] = (i>>16) & 0xff;
q[6] = (i>>8) & 0xff;
q[7] = i & 0xff;
}
/*
Write packet PKG. If PKG->id is -1, use next unused id. Return -1
in case of error, 0 if packet was completely written, 1 else.
*/
static int
_sftp_put_packet(struct packet *pkt, int flags)
{
char b[SFTP_HEADER_LEN], *p;
struct iovec iov[2];
int niov, n, off;
niov = 0;
if (!(flags & SFTP_FL_CONT)) {
if (pkt->id == -1)
pkt->id = _sftp_nextid++;
pkt->pn = 0;
}
if (pkt->pn < SFTP_HEADER_LEN) {
_sftp_put_uint32(b, &p, pkt->plen + SFTP_HEADER_LEN-4);
*(p++) = pkt->type;
_sftp_put_uint32(p, &p, pkt->id);
iov[niov].iov_base = b+pkt->pn;
iov[niov].iov_len = SFTP_HEADER_LEN-pkt->pn;
niov++;
}
off = pkt->pn-SFTP_HEADER_LEN;
if (off < 0)
off = 0;
if (pkt->plen) {
iov[niov].iov_base = pkt->dat + off;
iov[niov].iov_len = pkt->plen - off;
niov++;
}
if ((n=_sftp_writev(_conout, iov, niov, flags)) < 0)
return -1;
pkt->pn += n;
if (pkt->pn < pkt->plen+SFTP_HEADER_LEN)
return 1;
if (flags & SFTP_FL_LOG)
_sftp_log_packet(0, pkt);
return 0;
}
/*
Implements login method.
*/
int
sftp_login(char *user, char *pass)
{
/* XXX: handle user != NULL */
status.host = mkhoststr(0, 0);
return 0;
}
/*
Implements open method.
*/
int
sftp_open(char *host, char *port, char *user, char *pass)
{
int pin[2], pout[2];
pid_t pid;
ftp_remember_host(host, port);
ftp_remember_user(user, pass);
_sftp_packet->dat = _sftp_buffer;
if (pipe(pin) != 0 || pipe(pout) != 0) {
disp_status(DISP_ERROR, "cannot create pipes: %s",
strerror(errno));
return -1;
}
switch ((pid=fork())) {
case -1:
disp_status(DISP_ERROR, "cannot fork: %s", strerror(errno));
return -1;
case 0:
close(pin[0]);
close(pout[1]);
_sftp_start_ssh(pout[0], pin[1]);
/* NOTREACHED */
default:
_sftp_ssh_pid = pid;
signal(SIGCHLD, _sftp_sig_child);
close(pin[1]);
close(pout[0]);
_conin = pin[0];
_conout = pout[1];
fcntl(_conin, F_SETFD, 1);
fcntl(_conout, F_SETFD, 1);
/* XXX: check for minmal server version */
if (sftp_send_init(SFTP_PROTO_VERSION) < 0) {
sftp_close();
return -1;
}
return 0;
}
}
/*
Set up environment and exec ssh. In case of error, write status
packet to pipe and exit(0).
*/
static void
_sftp_start_ssh(int fdin, int fdout)
{
char *args[20];
int n;
signal(SIGPIPE, SIG_DFL);
close(0);
close(1);
/* for use in _sftp_send_error_packet() */
_conout = fdout;
if (dup(fdin) != 0 || dup(fdout) != 1) {
_sftp_send_error_packet("cannot dup: %s", strerror(errno));
exit(0);
}
close(fdin);
close(fdout);
n = 0;
args[n++] = "ssh";
args[n++] = "-2";
args[n++] = "-s";
if (ftp_prt()) {
args[n++] = "-p";
args[n++] = ftp_prt();
}
if (ftp_user()) {
args[n++] = "-l";
args[n++] = ftp_user();
}
args[n++] = ftp_host();
args[n++] = "sftp";
args[n++] = NULL;
execvp("ssh", args);
_sftp_send_error_packet("exec failed: %s", strerror(errno));