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HardenedBSD/crypto/openssh/sftp-client.c
Dag-Erling Smørgrav 4a421b6336 Upgrade to OpenSSH 5.8p2.
2011-05-04 07:34:44 +00:00

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/* $OpenBSD: sftp-client.c,v 1.94 2010/12/04 00:18:01 djm Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* XXX: memleaks */
/* XXX: signed vs unsigned */
/* XXX: remove all logging, only return status codes */
/* XXX: copy between two remote sites */
#include "includes.h"
#include <sys/types.h>
#include <sys/param.h>
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#include "openbsd-compat/sys-queue.h"
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <sys/uio.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "xmalloc.h"
#include "buffer.h"
#include "log.h"
#include "atomicio.h"
#include "progressmeter.h"
#include "misc.h"
#include "sftp.h"
#include "sftp-common.h"
#include "sftp-client.h"
extern volatile sig_atomic_t interrupted;
extern int showprogress;
/* Minimum amount of data to read at a time */
#define MIN_READ_SIZE 512
/* Maximum depth to descend in directory trees */
#define MAX_DIR_DEPTH 64
struct sftp_conn {
int fd_in;
int fd_out;
u_int transfer_buflen;
u_int num_requests;
u_int version;
u_int msg_id;
#define SFTP_EXT_POSIX_RENAME 0x00000001
#define SFTP_EXT_STATVFS 0x00000002
#define SFTP_EXT_FSTATVFS 0x00000004
#define SFTP_EXT_HARDLINK 0x00000008
u_int exts;
u_int64_t limit_kbps;
struct bwlimit bwlimit_in, bwlimit_out;
};
static char *
get_handle(struct sftp_conn *conn, u_int expected_id, u_int *len,
const char *errfmt, ...) __attribute__((format(printf, 4, 5)));
/* ARGSUSED */
static int
sftpio(void *_bwlimit, size_t amount)
{
struct bwlimit *bwlimit = (struct bwlimit *)_bwlimit;
bandwidth_limit(bwlimit, amount);
return 0;
}
static void
send_msg(struct sftp_conn *conn, Buffer *m)
{
u_char mlen[4];
struct iovec iov[2];
if (buffer_len(m) > SFTP_MAX_MSG_LENGTH)
fatal("Outbound message too long %u", buffer_len(m));
/* Send length first */
put_u32(mlen, buffer_len(m));
iov[0].iov_base = mlen;
iov[0].iov_len = sizeof(mlen);
iov[1].iov_base = buffer_ptr(m);
iov[1].iov_len = buffer_len(m);
if (atomiciov6(writev, conn->fd_out, iov, 2,
conn->limit_kbps > 0 ? sftpio : NULL, &conn->bwlimit_out) !=
buffer_len(m) + sizeof(mlen))
fatal("Couldn't send packet: %s", strerror(errno));
buffer_clear(m);
}
static void
get_msg(struct sftp_conn *conn, Buffer *m)
{
u_int msg_len;
buffer_append_space(m, 4);
if (atomicio6(read, conn->fd_in, buffer_ptr(m), 4,
conn->limit_kbps > 0 ? sftpio : NULL, &conn->bwlimit_in) != 4) {
if (errno == EPIPE)
fatal("Connection closed");
else
fatal("Couldn't read packet: %s", strerror(errno));
}
msg_len = buffer_get_int(m);
if (msg_len > SFTP_MAX_MSG_LENGTH)
fatal("Received message too long %u", msg_len);
buffer_append_space(m, msg_len);
if (atomicio6(read, conn->fd_in, buffer_ptr(m), msg_len,
conn->limit_kbps > 0 ? sftpio : NULL, &conn->bwlimit_in)
!= msg_len) {
if (errno == EPIPE)
fatal("Connection closed");
else
fatal("Read packet: %s", strerror(errno));
}
}
static void
send_string_request(struct sftp_conn *conn, u_int id, u_int code, char *s,
u_int len)
{
Buffer msg;
buffer_init(&msg);
buffer_put_char(&msg, code);
buffer_put_int(&msg, id);
buffer_put_string(&msg, s, len);
send_msg(conn, &msg);
debug3("Sent message fd %d T:%u I:%u", conn->fd_out, code, id);
buffer_free(&msg);
}
static void
send_string_attrs_request(struct sftp_conn *conn, u_int id, u_int code,
char *s, u_int len, Attrib *a)
{
Buffer msg;
buffer_init(&msg);
buffer_put_char(&msg, code);
buffer_put_int(&msg, id);
buffer_put_string(&msg, s, len);
encode_attrib(&msg, a);
send_msg(conn, &msg);
debug3("Sent message fd %d T:%u I:%u", conn->fd_out, code, id);
buffer_free(&msg);
}
static u_int
get_status(struct sftp_conn *conn, u_int expected_id)
{
Buffer msg;
u_int type, id, status;
buffer_init(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type != SSH2_FXP_STATUS)
fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u",
SSH2_FXP_STATUS, type);
status = buffer_get_int(&msg);
buffer_free(&msg);
debug3("SSH2_FXP_STATUS %u", status);
return status;
}
static char *
get_handle(struct sftp_conn *conn, u_int expected_id, u_int *len,
const char *errfmt, ...)
{
Buffer msg;
u_int type, id;
char *handle, errmsg[256];
va_list args;
int status;
va_start(args, errfmt);
if (errfmt != NULL)
vsnprintf(errmsg, sizeof(errmsg), errfmt, args);
va_end(args);
buffer_init(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
if (id != expected_id)
fatal("%s: ID mismatch (%u != %u)",
errfmt == NULL ? __func__ : errmsg, id, expected_id);
if (type == SSH2_FXP_STATUS) {
status = buffer_get_int(&msg);
if (errfmt != NULL)
error("%s: %s", errmsg, fx2txt(status));
buffer_free(&msg);
return(NULL);
} else if (type != SSH2_FXP_HANDLE)
fatal("%s: Expected SSH2_FXP_HANDLE(%u) packet, got %u",
errfmt == NULL ? __func__ : errmsg, SSH2_FXP_HANDLE, type);
handle = buffer_get_string(&msg, len);
buffer_free(&msg);
return(handle);
}
static Attrib *
get_decode_stat(struct sftp_conn *conn, u_int expected_id, int quiet)
{
Buffer msg;
u_int type, id;
Attrib *a;
buffer_init(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
debug3("Received stat reply T:%u I:%u", type, id);
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
int status = buffer_get_int(&msg);
if (quiet)
debug("Couldn't stat remote file: %s", fx2txt(status));
else
error("Couldn't stat remote file: %s", fx2txt(status));
buffer_free(&msg);
return(NULL);
} else if (type != SSH2_FXP_ATTRS) {
fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u",
SSH2_FXP_ATTRS, type);
}
a = decode_attrib(&msg);
buffer_free(&msg);
return(a);
}
static int
get_decode_statvfs(struct sftp_conn *conn, struct sftp_statvfs *st,
u_int expected_id, int quiet)
{
Buffer msg;
u_int type, id, flag;
buffer_init(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
debug3("Received statvfs reply T:%u I:%u", type, id);
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
int status = buffer_get_int(&msg);
if (quiet)
debug("Couldn't statvfs: %s", fx2txt(status));
else
error("Couldn't statvfs: %s", fx2txt(status));
buffer_free(&msg);
return -1;
} else if (type != SSH2_FXP_EXTENDED_REPLY) {
fatal("Expected SSH2_FXP_EXTENDED_REPLY(%u) packet, got %u",
SSH2_FXP_EXTENDED_REPLY, type);
}
bzero(st, sizeof(*st));
st->f_bsize = buffer_get_int64(&msg);
st->f_frsize = buffer_get_int64(&msg);
st->f_blocks = buffer_get_int64(&msg);
st->f_bfree = buffer_get_int64(&msg);
st->f_bavail = buffer_get_int64(&msg);
st->f_files = buffer_get_int64(&msg);
st->f_ffree = buffer_get_int64(&msg);
st->f_favail = buffer_get_int64(&msg);
st->f_fsid = buffer_get_int64(&msg);
flag = buffer_get_int64(&msg);
st->f_namemax = buffer_get_int64(&msg);
st->f_flag = (flag & SSH2_FXE_STATVFS_ST_RDONLY) ? ST_RDONLY : 0;
st->f_flag |= (flag & SSH2_FXE_STATVFS_ST_NOSUID) ? ST_NOSUID : 0;
buffer_free(&msg);
return 0;
}
struct sftp_conn *
do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests,
u_int64_t limit_kbps)
{
u_int type;
Buffer msg;
struct sftp_conn *ret;
ret = xmalloc(sizeof(*ret));
ret->fd_in = fd_in;
ret->fd_out = fd_out;
ret->transfer_buflen = transfer_buflen;
ret->num_requests = num_requests;
ret->exts = 0;
ret->limit_kbps = 0;
buffer_init(&msg);
buffer_put_char(&msg, SSH2_FXP_INIT);
buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
send_msg(ret, &msg);
buffer_clear(&msg);
get_msg(ret, &msg);
/* Expecting a VERSION reply */
if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) {
error("Invalid packet back from SSH2_FXP_INIT (type %u)",
type);
buffer_free(&msg);
return(NULL);
}
ret->version = buffer_get_int(&msg);
debug2("Remote version: %u", ret->version);
/* Check for extensions */
while (buffer_len(&msg) > 0) {
char *name = buffer_get_string(&msg, NULL);
char *value = buffer_get_string(&msg, NULL);
int known = 0;
if (strcmp(name, "posix-rename@openssh.com") == 0 &&
strcmp(value, "1") == 0) {
ret->exts |= SFTP_EXT_POSIX_RENAME;
known = 1;
} else if (strcmp(name, "statvfs@openssh.com") == 0 &&
strcmp(value, "2") == 0) {
ret->exts |= SFTP_EXT_STATVFS;
known = 1;
} else if (strcmp(name, "fstatvfs@openssh.com") == 0 &&
strcmp(value, "2") == 0) {
ret->exts |= SFTP_EXT_FSTATVFS;
known = 1;
} else if (strcmp(name, "hardlink@openssh.com") == 0 &&
strcmp(value, "1") == 0) {
ret->exts |= SFTP_EXT_HARDLINK;
known = 1;
}
if (known) {
debug2("Server supports extension \"%s\" revision %s",
name, value);
} else {
debug2("Unrecognised server extension \"%s\"", name);
}
xfree(name);
xfree(value);
}
buffer_free(&msg);
/* Some filexfer v.0 servers don't support large packets */
if (ret->version == 0)
ret->transfer_buflen = MIN(ret->transfer_buflen, 20480);
ret->limit_kbps = limit_kbps;
if (ret->limit_kbps > 0) {
bandwidth_limit_init(&ret->bwlimit_in, ret->limit_kbps,
ret->transfer_buflen);
bandwidth_limit_init(&ret->bwlimit_out, ret->limit_kbps,
ret->transfer_buflen);
}
return ret;
}
u_int
sftp_proto_version(struct sftp_conn *conn)
{
return conn->version;
}
int
do_close(struct sftp_conn *conn, char *handle, u_int handle_len)
{
u_int id, status;
Buffer msg;
buffer_init(&msg);
id = conn->msg_id++;
buffer_put_char(&msg, SSH2_FXP_CLOSE);
buffer_put_int(&msg, id);
buffer_put_string(&msg, handle, handle_len);
send_msg(conn, &msg);
debug3("Sent message SSH2_FXP_CLOSE I:%u", id);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("Couldn't close file: %s", fx2txt(status));
buffer_free(&msg);
return status;
}
static int
do_lsreaddir(struct sftp_conn *conn, char *path, int printflag,
SFTP_DIRENT ***dir)
{
Buffer msg;
u_int count, type, id, handle_len, i, expected_id, ents = 0;
char *handle;
id = conn->msg_id++;
buffer_init(&msg);
buffer_put_char(&msg, SSH2_FXP_OPENDIR);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, path);
send_msg(conn, &msg);
buffer_clear(&msg);
handle = get_handle(conn, id, &handle_len,
"remote readdir(\"%s\")", path);
if (handle == NULL)
return -1;
if (dir) {
ents = 0;
*dir = xmalloc(sizeof(**dir));
(*dir)[0] = NULL;
}
for (; !interrupted;) {
id = expected_id = conn->msg_id++;
debug3("Sending SSH2_FXP_READDIR I:%u", id);
buffer_clear(&msg);
buffer_put_char(&msg, SSH2_FXP_READDIR);
buffer_put_int(&msg, id);
buffer_put_string(&msg, handle, handle_len);
send_msg(conn, &msg);
buffer_clear(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
debug3("Received reply T:%u I:%u", type, id);
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
int status = buffer_get_int(&msg);
debug3("Received SSH2_FXP_STATUS %d", status);
if (status == SSH2_FX_EOF) {
break;
} else {
error("Couldn't read directory: %s",
fx2txt(status));
do_close(conn, handle, handle_len);
xfree(handle);
return(status);
}
} else if (type != SSH2_FXP_NAME)
fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
SSH2_FXP_NAME, type);
count = buffer_get_int(&msg);
if (count == 0)
break;
debug3("Received %d SSH2_FXP_NAME responses", count);
for (i = 0; i < count; i++) {
char *filename, *longname;
Attrib *a;
filename = buffer_get_string(&msg, NULL);
longname = buffer_get_string(&msg, NULL);
a = decode_attrib(&msg);
if (printflag)
printf("%s\n", longname);
/*
* Directory entries should never contain '/'
* These can be used to attack recursive ops
* (e.g. send '../../../../etc/passwd')
*/
if (strchr(filename, '/') != NULL) {
error("Server sent suspect path \"%s\" "
"during readdir of \"%s\"", filename, path);
goto next;
}
if (dir) {
*dir = xrealloc(*dir, ents + 2, sizeof(**dir));
(*dir)[ents] = xmalloc(sizeof(***dir));
(*dir)[ents]->filename = xstrdup(filename);
(*dir)[ents]->longname = xstrdup(longname);
memcpy(&(*dir)[ents]->a, a, sizeof(*a));
(*dir)[++ents] = NULL;
}
next:
xfree(filename);
xfree(longname);
}
}
buffer_free(&msg);
do_close(conn, handle, handle_len);
xfree(handle);
/* Don't return partial matches on interrupt */
if (interrupted && dir != NULL && *dir != NULL) {
free_sftp_dirents(*dir);
*dir = xmalloc(sizeof(**dir));
**dir = NULL;
}
return 0;
}
int
do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir)
{
return(do_lsreaddir(conn, path, 0, dir));
}
void free_sftp_dirents(SFTP_DIRENT **s)
{
int i;
for (i = 0; s[i]; i++) {
xfree(s[i]->filename);
xfree(s[i]->longname);
xfree(s[i]);
}
xfree(s);
}
int
do_rm(struct sftp_conn *conn, char *path)
{
u_int status, id;
debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_REMOVE, path, strlen(path));
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("Couldn't delete file: %s", fx2txt(status));
return(status);
}
int
do_mkdir(struct sftp_conn *conn, char *path, Attrib *a, int printflag)
{
u_int status, id;
id = conn->msg_id++;
send_string_attrs_request(conn, id, SSH2_FXP_MKDIR, path,
strlen(path), a);
status = get_status(conn, id);
if (status != SSH2_FX_OK && printflag)
error("Couldn't create directory: %s", fx2txt(status));
return(status);
}
int
do_rmdir(struct sftp_conn *conn, char *path)
{
u_int status, id;
id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_RMDIR, path,
strlen(path));
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("Couldn't remove directory: %s", fx2txt(status));
return(status);
}
Attrib *
do_stat(struct sftp_conn *conn, char *path, int quiet)
{
u_int id;
id = conn->msg_id++;
send_string_request(conn, id,
conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT,
path, strlen(path));
return(get_decode_stat(conn, id, quiet));
}
Attrib *
do_lstat(struct sftp_conn *conn, char *path, int quiet)
{
u_int id;
if (conn->version == 0) {
if (quiet)
debug("Server version does not support lstat operation");
else
logit("Server version does not support lstat operation");
return(do_stat(conn, path, quiet));
}
id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_LSTAT, path,
strlen(path));
return(get_decode_stat(conn, id, quiet));
}
#ifdef notyet
Attrib *
do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet)
{
u_int id;
id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_FSTAT, handle,
handle_len);
return(get_decode_stat(conn, id, quiet));
}
#endif
int
do_setstat(struct sftp_conn *conn, char *path, Attrib *a)
{
u_int status, id;
id = conn->msg_id++;
send_string_attrs_request(conn, id, SSH2_FXP_SETSTAT, path,
strlen(path), a);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("Couldn't setstat on \"%s\": %s", path,
fx2txt(status));
return(status);
}
int
do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len,
Attrib *a)
{
u_int status, id;
id = conn->msg_id++;
send_string_attrs_request(conn, id, SSH2_FXP_FSETSTAT, handle,
handle_len, a);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("Couldn't fsetstat: %s", fx2txt(status));
return(status);
}
char *
do_realpath(struct sftp_conn *conn, char *path)
{
Buffer msg;
u_int type, expected_id, count, id;
char *filename, *longname;
Attrib *a;
expected_id = id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_REALPATH, path,
strlen(path));
buffer_init(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
u_int status = buffer_get_int(&msg);
error("Couldn't canonicalise: %s", fx2txt(status));
buffer_free(&msg);
return NULL;
} else if (type != SSH2_FXP_NAME)
fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
SSH2_FXP_NAME, type);
count = buffer_get_int(&msg);
if (count != 1)
fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count);
filename = buffer_get_string(&msg, NULL);
longname = buffer_get_string(&msg, NULL);
a = decode_attrib(&msg);
debug3("SSH_FXP_REALPATH %s -> %s", path, filename);
xfree(longname);
buffer_free(&msg);
return(filename);
}
int
do_rename(struct sftp_conn *conn, char *oldpath, char *newpath)
{
Buffer msg;
u_int status, id;
buffer_init(&msg);
/* Send rename request */
id = conn->msg_id++;
if ((conn->exts & SFTP_EXT_POSIX_RENAME)) {
buffer_put_char(&msg, SSH2_FXP_EXTENDED);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, "posix-rename@openssh.com");
} else {
buffer_put_char(&msg, SSH2_FXP_RENAME);
buffer_put_int(&msg, id);
}
buffer_put_cstring(&msg, oldpath);
buffer_put_cstring(&msg, newpath);
send_msg(conn, &msg);
debug3("Sent message %s \"%s\" -> \"%s\"",
(conn->exts & SFTP_EXT_POSIX_RENAME) ? "posix-rename@openssh.com" :
"SSH2_FXP_RENAME", oldpath, newpath);
buffer_free(&msg);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath,
newpath, fx2txt(status));
return(status);
}
int
do_hardlink(struct sftp_conn *conn, char *oldpath, char *newpath)
{
Buffer msg;
u_int status, id;
buffer_init(&msg);
/* Send link request */
id = conn->msg_id++;
if ((conn->exts & SFTP_EXT_HARDLINK) == 0) {
error("Server does not support hardlink@openssh.com extension");
return -1;
}
buffer_put_char(&msg, SSH2_FXP_EXTENDED);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, "hardlink@openssh.com");
buffer_put_cstring(&msg, oldpath);
buffer_put_cstring(&msg, newpath);
send_msg(conn, &msg);
debug3("Sent message hardlink@openssh.com \"%s\" -> \"%s\"",
oldpath, newpath);
buffer_free(&msg);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("Couldn't link file \"%s\" to \"%s\": %s", oldpath,
newpath, fx2txt(status));
return(status);
}
int
do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath)
{
Buffer msg;
u_int status, id;
if (conn->version < 3) {
error("This server does not support the symlink operation");
return(SSH2_FX_OP_UNSUPPORTED);
}
buffer_init(&msg);
/* Send symlink request */
id = conn->msg_id++;
buffer_put_char(&msg, SSH2_FXP_SYMLINK);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, oldpath);
buffer_put_cstring(&msg, newpath);
send_msg(conn, &msg);
debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath,
newpath);
buffer_free(&msg);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath,
newpath, fx2txt(status));
return(status);
}
#ifdef notyet
char *
do_readlink(struct sftp_conn *conn, char *path)
{
Buffer msg;
u_int type, expected_id, count, id;
char *filename, *longname;
Attrib *a;
expected_id = id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_READLINK, path, strlen(path));
buffer_init(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
u_int status = buffer_get_int(&msg);
error("Couldn't readlink: %s", fx2txt(status));
return(NULL);
} else if (type != SSH2_FXP_NAME)
fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
SSH2_FXP_NAME, type);
count = buffer_get_int(&msg);
if (count != 1)
fatal("Got multiple names (%d) from SSH_FXP_READLINK", count);
filename = buffer_get_string(&msg, NULL);
longname = buffer_get_string(&msg, NULL);
a = decode_attrib(&msg);
debug3("SSH_FXP_READLINK %s -> %s", path, filename);
xfree(longname);
buffer_free(&msg);
return(filename);
}
#endif
int
do_statvfs(struct sftp_conn *conn, const char *path, struct sftp_statvfs *st,
int quiet)
{
Buffer msg;
u_int id;
if ((conn->exts & SFTP_EXT_STATVFS) == 0) {
error("Server does not support statvfs@openssh.com extension");
return -1;
}
id = conn->msg_id++;
buffer_init(&msg);
buffer_clear(&msg);
buffer_put_char(&msg, SSH2_FXP_EXTENDED);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, "statvfs@openssh.com");
buffer_put_cstring(&msg, path);
send_msg(conn, &msg);
buffer_free(&msg);
return get_decode_statvfs(conn, st, id, quiet);
}
#ifdef notyet
int
do_fstatvfs(struct sftp_conn *conn, const char *handle, u_int handle_len,
struct sftp_statvfs *st, int quiet)
{
Buffer msg;
u_int id;
if ((conn->exts & SFTP_EXT_FSTATVFS) == 0) {
error("Server does not support fstatvfs@openssh.com extension");
return -1;
}
id = conn->msg_id++;
buffer_init(&msg);
buffer_clear(&msg);
buffer_put_char(&msg, SSH2_FXP_EXTENDED);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, "fstatvfs@openssh.com");
buffer_put_string(&msg, handle, handle_len);
send_msg(conn, &msg);
buffer_free(&msg);
return get_decode_statvfs(conn, st, id, quiet);
}
#endif
static void
send_read_request(struct sftp_conn *conn, u_int id, u_int64_t offset,
u_int len, char *handle, u_int handle_len)
{
Buffer msg;
buffer_init(&msg);
buffer_clear(&msg);
buffer_put_char(&msg, SSH2_FXP_READ);
buffer_put_int(&msg, id);
buffer_put_string(&msg, handle, handle_len);
buffer_put_int64(&msg, offset);
buffer_put_int(&msg, len);
send_msg(conn, &msg);
buffer_free(&msg);
}
int
do_download(struct sftp_conn *conn, char *remote_path, char *local_path,
Attrib *a, int pflag)
{
Attrib junk;
Buffer msg;
char *handle;
int local_fd, status = 0, write_error;
int read_error, write_errno;
u_int64_t offset, size;
u_int handle_len, mode, type, id, buflen, num_req, max_req;
off_t progress_counter;
struct request {
u_int id;
u_int len;
u_int64_t offset;
TAILQ_ENTRY(request) tq;
};
TAILQ_HEAD(reqhead, request) requests;
struct request *req;
TAILQ_INIT(&requests);
if (a == NULL && (a = do_stat(conn, remote_path, 0)) == NULL)
return -1;
/* Do not preserve set[ug]id here, as we do not preserve ownership */
if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
mode = a->perm & 0777;
else
mode = 0666;
if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) &&
(!S_ISREG(a->perm))) {
error("Cannot download non-regular file: %s", remote_path);
return(-1);
}
if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
size = a->size;
else
size = 0;
buflen = conn->transfer_buflen;
buffer_init(&msg);
/* Send open request */
id = conn->msg_id++;
buffer_put_char(&msg, SSH2_FXP_OPEN);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, remote_path);
buffer_put_int(&msg, SSH2_FXF_READ);
attrib_clear(&junk); /* Send empty attributes */
encode_attrib(&msg, &junk);
send_msg(conn, &msg);
debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
handle = get_handle(conn, id, &handle_len,
"remote open(\"%s\")", remote_path);
if (handle == NULL) {
buffer_free(&msg);
return(-1);
}
local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC,
mode | S_IWRITE);
if (local_fd == -1) {
error("Couldn't open local file \"%s\" for writing: %s",
local_path, strerror(errno));
do_close(conn, handle, handle_len);
buffer_free(&msg);
xfree(handle);
return(-1);
}
/* Read from remote and write to local */
write_error = read_error = write_errno = num_req = offset = 0;
max_req = 1;
progress_counter = 0;
if (showprogress && size != 0)
start_progress_meter(remote_path, size, &progress_counter);
while (num_req > 0 || max_req > 0) {
char *data;
u_int len;
/*
* Simulate EOF on interrupt: stop sending new requests and
* allow outstanding requests to drain gracefully
*/
if (interrupted) {
if (num_req == 0) /* If we haven't started yet... */
break;
max_req = 0;
}
/* Send some more requests */
while (num_req < max_req) {
debug3("Request range %llu -> %llu (%d/%d)",
(unsigned long long)offset,
(unsigned long long)offset + buflen - 1,
num_req, max_req);
req = xmalloc(sizeof(*req));
req->id = conn->msg_id++;
req->len = buflen;
req->offset = offset;
offset += buflen;
num_req++;
TAILQ_INSERT_TAIL(&requests, req, tq);
send_read_request(conn, req->id, req->offset,
req->len, handle, handle_len);
}
buffer_clear(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
debug3("Received reply T:%u I:%u R:%d", type, id, max_req);
/* Find the request in our queue */
for (req = TAILQ_FIRST(&requests);
req != NULL && req->id != id;
req = TAILQ_NEXT(req, tq))
;
if (req == NULL)
fatal("Unexpected reply %u", id);
switch (type) {
case SSH2_FXP_STATUS:
status = buffer_get_int(&msg);
if (status != SSH2_FX_EOF)
read_error = 1;
max_req = 0;
TAILQ_REMOVE(&requests, req, tq);
xfree(req);
num_req--;
break;
case SSH2_FXP_DATA:
data = buffer_get_string(&msg, &len);
debug3("Received data %llu -> %llu",
(unsigned long long)req->offset,
(unsigned long long)req->offset + len - 1);
if (len > req->len)
fatal("Received more data than asked for "
"%u > %u", len, req->len);
if ((lseek(local_fd, req->offset, SEEK_SET) == -1 ||
atomicio(vwrite, local_fd, data, len) != len) &&
!write_error) {
write_errno = errno;
write_error = 1;
max_req = 0;
}
progress_counter += len;
xfree(data);
if (len == req->len) {
TAILQ_REMOVE(&requests, req, tq);
xfree(req);
num_req--;
} else {
/* Resend the request for the missing data */
debug3("Short data block, re-requesting "
"%llu -> %llu (%2d)",
(unsigned long long)req->offset + len,
(unsigned long long)req->offset +
req->len - 1, num_req);
req->id = conn->msg_id++;
req->len -= len;
req->offset += len;
send_read_request(conn, req->id,
req->offset, req->len, handle, handle_len);
/* Reduce the request size */
if (len < buflen)
buflen = MAX(MIN_READ_SIZE, len);
}
if (max_req > 0) { /* max_req = 0 iff EOF received */
if (size > 0 && offset > size) {
/* Only one request at a time
* after the expected EOF */
debug3("Finish at %llu (%2d)",
(unsigned long long)offset,
num_req);
max_req = 1;
} else if (max_req <= conn->num_requests) {
++max_req;
}
}
break;
default:
fatal("Expected SSH2_FXP_DATA(%u) packet, got %u",
SSH2_FXP_DATA, type);
}
}
if (showprogress && size)
stop_progress_meter();
/* Sanity check */
if (TAILQ_FIRST(&requests) != NULL)
fatal("Transfer complete, but requests still in queue");
if (read_error) {
error("Couldn't read from remote file \"%s\" : %s",
remote_path, fx2txt(status));
do_close(conn, handle, handle_len);
} else if (write_error) {
error("Couldn't write to \"%s\": %s", local_path,
strerror(write_errno));
status = -1;
do_close(conn, handle, handle_len);
} else {
status = do_close(conn, handle, handle_len);
/* Override umask and utimes if asked */
#ifdef HAVE_FCHMOD
if (pflag && fchmod(local_fd, mode) == -1)
#else
if (pflag && chmod(local_path, mode) == -1)
#endif /* HAVE_FCHMOD */
error("Couldn't set mode on \"%s\": %s", local_path,
strerror(errno));
if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) {
struct timeval tv[2];
tv[0].tv_sec = a->atime;
tv[1].tv_sec = a->mtime;
tv[0].tv_usec = tv[1].tv_usec = 0;
if (utimes(local_path, tv) == -1)
error("Can't set times on \"%s\": %s",
local_path, strerror(errno));
}
}
close(local_fd);
buffer_free(&msg);
xfree(handle);
return(status);
}
static int
download_dir_internal(struct sftp_conn *conn, char *src, char *dst,
Attrib *dirattrib, int pflag, int printflag, int depth)
{
int i, ret = 0;
SFTP_DIRENT **dir_entries;
char *filename, *new_src, *new_dst;
mode_t mode = 0777;
if (depth >= MAX_DIR_DEPTH) {
error("Maximum directory depth exceeded: %d levels", depth);
return -1;
}
if (dirattrib == NULL &&
(dirattrib = do_stat(conn, src, 1)) == NULL) {
error("Unable to stat remote directory \"%s\"", src);
return -1;
}
if (!S_ISDIR(dirattrib->perm)) {
error("\"%s\" is not a directory", src);
return -1;
}
if (printflag)
printf("Retrieving %s\n", src);
if (dirattrib->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
mode = dirattrib->perm & 01777;
else {
debug("Server did not send permissions for "
"directory \"%s\"", dst);
}
if (mkdir(dst, mode) == -1 && errno != EEXIST) {
error("mkdir %s: %s", dst, strerror(errno));
return -1;
}
if (do_readdir(conn, src, &dir_entries) == -1) {
error("%s: Failed to get directory contents", src);
return -1;
}
for (i = 0; dir_entries[i] != NULL && !interrupted; i++) {
filename = dir_entries[i]->filename;
new_dst = path_append(dst, filename);
new_src = path_append(src, filename);
if (S_ISDIR(dir_entries[i]->a.perm)) {
if (strcmp(filename, ".") == 0 ||
strcmp(filename, "..") == 0)
continue;
if (download_dir_internal(conn, new_src, new_dst,
&(dir_entries[i]->a), pflag, printflag,
depth + 1) == -1)
ret = -1;
} else if (S_ISREG(dir_entries[i]->a.perm) ) {
if (do_download(conn, new_src, new_dst,
&(dir_entries[i]->a), pflag) == -1) {
error("Download of file %s to %s failed",
new_src, new_dst);
ret = -1;
}
} else
logit("%s: not a regular file\n", new_src);
xfree(new_dst);
xfree(new_src);
}
if (pflag) {
if (dirattrib->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
struct timeval tv[2];
tv[0].tv_sec = dirattrib->atime;
tv[1].tv_sec = dirattrib->mtime;
tv[0].tv_usec = tv[1].tv_usec = 0;
if (utimes(dst, tv) == -1)
error("Can't set times on \"%s\": %s",
dst, strerror(errno));
} else
debug("Server did not send times for directory "
"\"%s\"", dst);
}
free_sftp_dirents(dir_entries);
return ret;
}
int
download_dir(struct sftp_conn *conn, char *src, char *dst,
Attrib *dirattrib, int pflag, int printflag)
{
char *src_canon;
int ret;
if ((src_canon = do_realpath(conn, src)) == NULL) {
error("Unable to canonicalise path \"%s\"", src);
return -1;
}
ret = download_dir_internal(conn, src_canon, dst,
dirattrib, pflag, printflag, 0);
xfree(src_canon);
return ret;
}
int
do_upload(struct sftp_conn *conn, char *local_path, char *remote_path,
int pflag)
{
int local_fd;
int status = SSH2_FX_OK;
u_int handle_len, id, type;
off_t offset;
char *handle, *data;
Buffer msg;
struct stat sb;
Attrib a;
u_int32_t startid;
u_int32_t ackid;
struct outstanding_ack {
u_int id;
u_int len;
off_t offset;
TAILQ_ENTRY(outstanding_ack) tq;
};
TAILQ_HEAD(ackhead, outstanding_ack) acks;
struct outstanding_ack *ack = NULL;
TAILQ_INIT(&acks);
if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) {
error("Couldn't open local file \"%s\" for reading: %s",
local_path, strerror(errno));
return(-1);
}
if (fstat(local_fd, &sb) == -1) {
error("Couldn't fstat local file \"%s\": %s",
local_path, strerror(errno));
close(local_fd);
return(-1);
}
if (!S_ISREG(sb.st_mode)) {
error("%s is not a regular file", local_path);
close(local_fd);
return(-1);
}
stat_to_attrib(&sb, &a);
a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
a.perm &= 0777;
if (!pflag)
a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
buffer_init(&msg);
/* Send open request */
id = conn->msg_id++;
buffer_put_char(&msg, SSH2_FXP_OPEN);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, remote_path);
buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC);
encode_attrib(&msg, &a);
send_msg(conn, &msg);
debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path);
buffer_clear(&msg);
handle = get_handle(conn, id, &handle_len,
"remote open(\"%s\")", remote_path);
if (handle == NULL) {
close(local_fd);
buffer_free(&msg);
return -1;
}
startid = ackid = id + 1;
data = xmalloc(conn->transfer_buflen);
/* Read from local and write to remote */
offset = 0;
if (showprogress)
start_progress_meter(local_path, sb.st_size, &offset);
for (;;) {
int len;
/*
* Can't use atomicio here because it returns 0 on EOF,
* thus losing the last block of the file.
* Simulate an EOF on interrupt, allowing ACKs from the
* server to drain.
*/
if (interrupted || status != SSH2_FX_OK)
len = 0;
else do
len = read(local_fd, data, conn->transfer_buflen);
while ((len == -1) &&
(errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
if (len == -1)
fatal("Couldn't read from \"%s\": %s", local_path,
strerror(errno));
if (len != 0) {
ack = xmalloc(sizeof(*ack));
ack->id = ++id;
ack->offset = offset;
ack->len = len;
TAILQ_INSERT_TAIL(&acks, ack, tq);
buffer_clear(&msg);
buffer_put_char(&msg, SSH2_FXP_WRITE);
buffer_put_int(&msg, ack->id);
buffer_put_string(&msg, handle, handle_len);
buffer_put_int64(&msg, offset);
buffer_put_string(&msg, data, len);
send_msg(conn, &msg);
debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u",
id, (unsigned long long)offset, len);
} else if (TAILQ_FIRST(&acks) == NULL)
break;
if (ack == NULL)
fatal("Unexpected ACK %u", id);
if (id == startid || len == 0 ||
id - ackid >= conn->num_requests) {
u_int r_id;
buffer_clear(&msg);
get_msg(conn, &msg);
type = buffer_get_char(&msg);
r_id = buffer_get_int(&msg);
if (type != SSH2_FXP_STATUS)
fatal("Expected SSH2_FXP_STATUS(%d) packet, "
"got %d", SSH2_FXP_STATUS, type);
status = buffer_get_int(&msg);
debug3("SSH2_FXP_STATUS %d", status);
/* Find the request in our queue */
for (ack = TAILQ_FIRST(&acks);
ack != NULL && ack->id != r_id;
ack = TAILQ_NEXT(ack, tq))
;
if (ack == NULL)
fatal("Can't find request for ID %u", r_id);
TAILQ_REMOVE(&acks, ack, tq);
debug3("In write loop, ack for %u %u bytes at %lld",
ack->id, ack->len, (long long)ack->offset);
++ackid;
xfree(ack);
}
offset += len;
if (offset < 0)
fatal("%s: offset < 0", __func__);
}
buffer_free(&msg);
if (showprogress)
stop_progress_meter();
xfree(data);
if (status != SSH2_FX_OK) {
error("Couldn't write to remote file \"%s\": %s",
remote_path, fx2txt(status));
status = -1;
}
if (close(local_fd) == -1) {
error("Couldn't close local file \"%s\": %s", local_path,
strerror(errno));
status = -1;
}
/* Override umask and utimes if asked */
if (pflag)
do_fsetstat(conn, handle, handle_len, &a);
if (do_close(conn, handle, handle_len) != SSH2_FX_OK)
status = -1;
xfree(handle);
return status;
}
static int
upload_dir_internal(struct sftp_conn *conn, char *src, char *dst,
int pflag, int printflag, int depth)
{
int ret = 0, status;
DIR *dirp;
struct dirent *dp;
char *filename, *new_src, *new_dst;
struct stat sb;
Attrib a;
if (depth >= MAX_DIR_DEPTH) {
error("Maximum directory depth exceeded: %d levels", depth);
return -1;
}
if (stat(src, &sb) == -1) {
error("Couldn't stat directory \"%s\": %s",
src, strerror(errno));
return -1;
}
if (!S_ISDIR(sb.st_mode)) {
error("\"%s\" is not a directory", src);
return -1;
}
if (printflag)
printf("Entering %s\n", src);
attrib_clear(&a);
stat_to_attrib(&sb, &a);
a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
a.perm &= 01777;
if (!pflag)
a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
status = do_mkdir(conn, dst, &a, 0);
/*
* we lack a portable status for errno EEXIST,
* so if we get a SSH2_FX_FAILURE back we must check
* if it was created successfully.
*/
if (status != SSH2_FX_OK) {
if (status != SSH2_FX_FAILURE)
return -1;
if (do_stat(conn, dst, 0) == NULL)
return -1;
}
if ((dirp = opendir(src)) == NULL) {
error("Failed to open dir \"%s\": %s", src, strerror(errno));
return -1;
}
while (((dp = readdir(dirp)) != NULL) && !interrupted) {
if (dp->d_ino == 0)
continue;
filename = dp->d_name;
new_dst = path_append(dst, filename);
new_src = path_append(src, filename);
if (lstat(new_src, &sb) == -1) {
logit("%s: lstat failed: %s", filename,
strerror(errno));
ret = -1;
} else if (S_ISDIR(sb.st_mode)) {
if (strcmp(filename, ".") == 0 ||
strcmp(filename, "..") == 0)
continue;
if (upload_dir_internal(conn, new_src, new_dst,
pflag, printflag, depth + 1) == -1)
ret = -1;
} else if (S_ISREG(sb.st_mode)) {
if (do_upload(conn, new_src, new_dst, pflag) == -1) {
error("Uploading of file %s to %s failed!",
new_src, new_dst);
ret = -1;
}
} else
logit("%s: not a regular file\n", filename);
xfree(new_dst);
xfree(new_src);
}
do_setstat(conn, dst, &a);
(void) closedir(dirp);
return ret;
}
int
upload_dir(struct sftp_conn *conn, char *src, char *dst, int printflag,
int pflag)
{
char *dst_canon;
int ret;
if ((dst_canon = do_realpath(conn, dst)) == NULL) {
error("Unable to canonicalise path \"%s\"", dst);
return -1;
}
ret = upload_dir_internal(conn, src, dst_canon, pflag, printflag, 0);
xfree(dst_canon);
return ret;
}
char *
path_append(char *p1, char *p2)
{
char *ret;
size_t len = strlen(p1) + strlen(p2) + 2;
ret = xmalloc(len);
strlcpy(ret, p1, len);
if (p1[0] != '\0' && p1[strlen(p1) - 1] != '/')
strlcat(ret, "/", len);
strlcat(ret, p2, len);
return(ret);
}
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