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sftp.c
1573 lines (1367 loc) · 46.3 KB
/
sftp.c
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/* Copyright (c) 2004-2006, Sara Golemon <sarag@libssh2.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 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.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "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 COPYRIGHT OWNER OR
* CONTRIBUTORS 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 "libssh2_priv.h"
#include "libssh2_sftp.h"
/* Note: Version 6 was documented at the time of writing
* However it was marked as "DO NOT IMPLEMENT" due to pending changes
*
* This release of libssh2 implements Version 5 with automatic downgrade
* based on server's declaration
*/
/* SFTP 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_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
struct _LIBSSH2_SFTP {
LIBSSH2_CHANNEL *channel;
unsigned long request_id, version;
LIBSSH2_PACKET_BRIGADE packets;
LIBSSH2_SFTP_HANDLE *handles;
unsigned long last_errno;
};
#define LIBSSH2_SFTP_HANDLE_FILE 0
#define LIBSSH2_SFTP_HANDLE_DIR 1
/* S_IFREG */
#define LIBSSH2_SFTP_ATTR_PFILETYPE_FILE 0100000
/* S_IFDIR */
#define LIBSSH2_SFTP_ATTR_PFILETYPE_DIR 0040000
struct _LIBSSH2_SFTP_HANDLE {
LIBSSH2_SFTP *sftp;
LIBSSH2_SFTP_HANDLE *prev, *next;
char *handle;
int handle_len;
char handle_type;
union _libssh2_sftp_handle_data {
struct _libssh2_sftp_handle_file_data {
libssh2_uint64_t offset;
} file;
struct _libssh2_sftp_handle_dir_data {
unsigned long names_left;
void *names_packet;
char *next_name;
} dir;
} u;
};
/* {{{ libssh2_sftp_packet_add
* Add a packet to the SFTP packet brigade
*/
static int libssh2_sftp_packet_add(LIBSSH2_SFTP *sftp, unsigned char *data, unsigned long data_len)
{
if (!sftp)
{
return -1;
}
LIBSSH2_SESSION *session = sftp->channel->session;
LIBSSH2_PACKET *packet;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Received packet %d", (int)data[0]);
#endif
packet = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_PACKET));
if (!packet) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate datablock for SFTP packet", 0);
return -1;
}
memset(packet, 0, sizeof(LIBSSH2_PACKET));
packet->data = data;
packet->data_len = data_len;
packet->data_head = 5;
packet->brigade = &sftp->packets;
packet->next = NULL;
packet->prev = sftp->packets.tail;
if (packet->prev) {
packet->prev->next = packet;
} else {
sftp->packets.head = packet;
}
sftp->packets.tail = packet;
return 0;
}
/* }}} */
/* {{{ libssh2_sftp_packet_read
* Frame an SFTP packet off the channel
*/
static int libssh2_sftp_packet_read(LIBSSH2_SFTP *sftp, int should_block)
{
if (!sftp)
{
return -1;
}
LIBSSH2_CHANNEL *channel = sftp->channel;
LIBSSH2_SESSION *session = channel->session;
unsigned char buffer[4]; /* To store the packet length */
unsigned char *packet;
unsigned long packet_len, packet_received;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Waiting for packet: %s block", should_block ? "will" : "willnot");
#endif
if (should_block) {
libssh2_channel_set_blocking(channel, 1);
if (4 != libssh2_channel_read(channel, buffer, 4)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for FXP packet", 0);
return -1;
}
} else {
libssh2_channel_set_blocking(channel, 0);
if (1 != libssh2_channel_read(channel, buffer, 1)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for FXP packet", 0);
return 0;
}
libssh2_channel_set_blocking(channel, 1);
if (3 != libssh2_channel_read(channel, buffer + 1, 3)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for FXP packet", 0);
return -1;
}
}
packet_len = libssh2_ntohu32(buffer);
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Data begin - Packet Length: %lu", packet_len);
#endif
if (packet_len > LIBSSH2_SFTP_PACKET_MAXLEN) {
libssh2_error(session, LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, "SFTP packet too large", 0);
return -1;
}
packet = LIBSSH2_ALLOC(session, packet_len);
if (!packet) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate SFTP packet", 0);
return -1;
}
packet_received = 0;
while (packet_len > packet_received) {
long bytes_received = libssh2_channel_read(channel, packet + packet_received, packet_len - packet_received);
if (bytes_received < 0) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Receive error waiting for SFTP packet", 0);
LIBSSH2_FREE(session, packet);
return -1;
}
packet_received += bytes_received;
}
if (libssh2_sftp_packet_add(sftp, packet, packet_len)) {
LIBSSH2_FREE(session, packet);
return -1;
}
return packet[0];
}
/* }}} */
/* {{{ libssh2_sftp_packet_ask
* A la libssh2_packet_ask()
*/
static int libssh2_sftp_packet_ask(LIBSSH2_SFTP *sftp, unsigned char packet_type, unsigned long request_id, unsigned char **data, unsigned long *data_len, int poll_channel)
{
if (!sftp)
{
return -1;
}
LIBSSH2_SESSION *session = sftp->channel->session;
LIBSSH2_PACKET *packet = sftp->packets.head;
unsigned char match_buf[5];
int match_len = 5;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Asking for %d packet", (int)packet_type);
#endif
if (poll_channel) {
if (libssh2_sftp_packet_read(sftp, 0) < 0) {
return -1;
}
}
match_buf[0] = packet_type;
if (packet_type == SSH_FXP_VERSION) {
/* Special consideration when matching VERSION packet */
match_len = 1;
} else {
libssh2_htonu32(match_buf + 1, request_id);
}
while (packet) {
if (strncmp((const char *)packet->data, (const char *)match_buf, match_len) == 0) {
*data = packet->data;
*data_len = packet->data_len;
if (packet->prev) {
packet->prev->next = packet->next;
} else {
sftp->packets.head = packet->next;
}
if (packet->next) {
packet->next->prev = packet->prev;
} else {
sftp->packets.tail = packet->prev;
}
LIBSSH2_FREE(session, packet);
return 0;
}
packet = packet->next;
}
return -1;
}
/* }}} */
/* {{{ libssh2_sftp_packet_require
* A la libssh2_packet_require
*/
static int libssh2_sftp_packet_require(LIBSSH2_SFTP *sftp, unsigned char packet_type, unsigned long request_id, unsigned char **data, unsigned long *data_len)
{
if (!sftp)
{
return -1;
}
LIBSSH2_SESSION *session = sftp->channel->session;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Requiring %d packet", (int)packet_type);
#endif
if (libssh2_sftp_packet_ask(sftp, packet_type, request_id, data, data_len, 0) == 0) {
/* A packet was available in the packet brigade */
return 0;
}
while (session->socket_state == LIBSSH2_SOCKET_CONNECTED) {
int ret = libssh2_sftp_packet_read(sftp, 1);
if (ret < 0) {
return -1;
}
if (ret == 0) continue;
if (packet_type == ret) {
/* Be lazy, let packet_ask pull it out of the brigade */
return libssh2_sftp_packet_ask(sftp, packet_type, request_id, data, data_len, 0);
}
}
/* Only reached if the socket died */
return -1;
}
/* }}} */
/* {{{ libssh2_sftp_packet_requirev
* Requie one of N possible reponses
*/
static int libssh2_sftp_packet_requirev(LIBSSH2_SFTP *sftp, int num_valid_responses, unsigned char *valid_responses, unsigned long request_id, unsigned char **data, unsigned long *data_len)
{
if (!sftp)
{
return -1;
}
int i;
/* Flush */
while (libssh2_sftp_packet_read(sftp, 0) > 0);
while (sftp->channel->session->socket_state == LIBSSH2_SOCKET_CONNECTED) {
int ret;
for(i = 0; i < num_valid_responses; i++) {
if (libssh2_sftp_packet_ask(sftp, valid_responses[i], request_id, data, data_len, 0) == 0) {
return 0;
}
}
ret = libssh2_sftp_packet_read(sftp, 1);
if (ret < 0) {
return -1;
}
if (ret == 0) continue;
}
return -1;
}
/* }}} */
/* {{{ libssh2_sftp_attrsize
* Size that attr will occupy when turned into a bin struct
*/
static int libssh2_sftp_attrsize(LIBSSH2_SFTP_ATTRIBUTES *attrs)
{
if (!attrs)
{
return -1;
}
int attrsize = 4; /* flags(4) */
if (!attrs) {
return attrsize;
}
if (attrs->flags & LIBSSH2_SFTP_ATTR_SIZE) attrsize += 8;
if (attrs->flags & LIBSSH2_SFTP_ATTR_UIDGID) attrsize += 8;
if (attrs->flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) attrsize += 4;
if (attrs->flags & LIBSSH2_SFTP_ATTR_ACMODTIME) attrsize += 8; /* atime + mtime as u32 */
return attrsize;
}
/* }}} */
/* {{{ libssh2_sftp_attr2bin
* Populate attributes into an SFTP block
*/
static int libssh2_sftp_attr2bin(unsigned char *p, LIBSSH2_SFTP_ATTRIBUTES *attrs)
{
if (!attrs)
{
return -1;
}
unsigned char *s = p;
unsigned long flag_mask = LIBSSH2_SFTP_ATTR_SIZE | LIBSSH2_SFTP_ATTR_UIDGID | LIBSSH2_SFTP_ATTR_PERMISSIONS | LIBSSH2_SFTP_ATTR_ACMODTIME;
/* TODO: When we add SFTP4+ functionality flag_mask can get additional bits */
if (!attrs) {
libssh2_htonu32(s, 0);
return 4;
}
libssh2_htonu32(s, attrs->flags & flag_mask); s += 4;
if (attrs->flags & LIBSSH2_SFTP_ATTR_SIZE) {
libssh2_htonu64(s, attrs->filesize); s += 8;
}
if (attrs->flags & LIBSSH2_SFTP_ATTR_UIDGID) {
libssh2_htonu32(s, attrs->uid); s += 4;
libssh2_htonu32(s, attrs->gid); s += 4;
}
if (attrs->flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) {
libssh2_htonu32(s, attrs->permissions); s += 4;
}
if (attrs->flags & LIBSSH2_SFTP_ATTR_ACMODTIME) {
libssh2_htonu32(s, attrs->atime); s += 4;
libssh2_htonu32(s, attrs->mtime); s += 4;
}
return (s - p);
}
/* }}} */
/* {{{ libssh2_sftp_bin2attr
*/
static int libssh2_sftp_bin2attr(LIBSSH2_SFTP_ATTRIBUTES *attrs, unsigned char *p)
{
if (!attrs)
{
return -1;
}
unsigned char *s = p;
memset(attrs, 0, sizeof(LIBSSH2_SFTP_ATTRIBUTES));
attrs->flags = libssh2_ntohu32(s); s += 4;
if (attrs->flags & LIBSSH2_SFTP_ATTR_SIZE) {
attrs->filesize = libssh2_ntohu64(s); s += 8;
}
if (attrs->flags & LIBSSH2_SFTP_ATTR_UIDGID) {
attrs->uid = libssh2_ntohu32(s); s += 4;
attrs->gid = libssh2_ntohu32(s); s += 4;
}
if (attrs->flags & LIBSSH2_SFTP_ATTR_PERMISSIONS) {
attrs->permissions = libssh2_ntohu32(s); s += 4;
}
if (attrs->flags & LIBSSH2_SFTP_ATTR_ACMODTIME) {
attrs->atime = libssh2_ntohu32(s); s += 4;
attrs->mtime = libssh2_ntohu32(s); s += 4;
}
return (s - p);
}
/* }}} */
/* ************
* SFTP API *
************ */
/* {{{ libssh2_sftp_dtor
* Shutdown an SFTP stream when the channel closes
*/
LIBSSH2_CHANNEL_CLOSE_FUNC(libssh2_sftp_dtor) {
LIBSSH2_SFTP *sftp = (LIBSSH2_SFTP*)(*channel_abstract);
/* Loop through handles closing them */
while (sftp->handles) {
libssh2_sftp_close_handle(sftp->handles);
}
LIBSSH2_FREE(session, sftp);
}
/* }}} */
/* {{{ libssh2_sftp_init
* Startup an SFTP session
*/
LIBSSH2_API LIBSSH2_SFTP *libssh2_sftp_init(LIBSSH2_SESSION *session)
{
if (!session)
{
return NULL;
}
LIBSSH2_SFTP *sftp;
LIBSSH2_CHANNEL *channel;
unsigned char *data, *s, buffer[9]; /* sftp_header(5){excludes request_id} + version_id(4) */
unsigned long data_len;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Initializing SFTP subsystem");
#endif
channel = libssh2_channel_open_session(session);
if (!channel) {
libssh2_error(session, LIBSSH2_ERROR_CHANNEL_FAILURE, "Unable to startup channel", 0);
return NULL;
}
if (libssh2_channel_subsystem(channel, "sftp")) {
libssh2_error(session, LIBSSH2_ERROR_CHANNEL_FAILURE, "Unable to request SFTP subsystem", 0);
libssh2_channel_free(channel);
return NULL;
}
libssh2_channel_set_blocking(channel, 1);
libssh2_channel_handle_extended_data(channel, LIBSSH2_CHANNEL_EXTENDED_DATA_IGNORE);
sftp = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_SFTP));
if (!sftp) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate a new SFTP structure", 0);
libssh2_channel_free(channel);
return NULL;
}
memset(sftp, 0, sizeof(LIBSSH2_SFTP));
sftp->channel = channel;
sftp->request_id = 0;
libssh2_htonu32(buffer, 5);
buffer[4] = SSH_FXP_INIT;
libssh2_htonu32(buffer + 5, LIBSSH2_SFTP_VERSION);
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Sending FXP_INIT packet advertising version %d support", (int)LIBSSH2_SFTP_VERSION);
#endif
if (9 != libssh2_channel_write(channel, buffer, 9)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send SSH_FXP_INIT", 0);
libssh2_channel_free(channel);
LIBSSH2_FREE(session, sftp);
return NULL;
}
if (libssh2_sftp_packet_require(sftp, SSH_FXP_VERSION, 0, &data, &data_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for response from SFTP subsystem", 0);
libssh2_channel_free(channel);
LIBSSH2_FREE(session, sftp);
return NULL;
}
if (data_len < 5) {
libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL, "Invalid SSH_FXP_VERSION response", 0);
libssh2_channel_free(channel);
LIBSSH2_FREE(session, sftp);
return NULL;
}
s = data + 1;
sftp->version = libssh2_ntohu32(s); s += 4;
if (sftp->version > LIBSSH2_SFTP_VERSION) {
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Truncating remote SFTP version from %lu", sftp->version);
#endif
sftp->version = LIBSSH2_SFTP_VERSION;
}
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Enabling SFTP version %lu compatability", sftp->version);
#endif
while (s < (data + data_len)) {
char *extension_name, *extension_data;
unsigned long extname_len, extdata_len;
extname_len = libssh2_ntohu32(s); s += 4;
extension_name = (char *)s; s += extname_len;
extdata_len = libssh2_ntohu32(s); s += 4;
extension_data = (char *)s; s += extdata_len;
/* TODO: Actually process extensions */
}
LIBSSH2_FREE(session, data);
/* Make sure that when the channel gets closed, the SFTP service is shut down too */
sftp->channel->abstract = sftp;
sftp->channel->close_cb = libssh2_sftp_dtor;
return sftp;
}
/* }}} */
/* {{{ libssh2_sftp_shutdown
* Shutsdown the SFTP subsystem
*/
LIBSSH2_API int libssh2_sftp_shutdown(LIBSSH2_SFTP *sftp) {
if (!sftp)
{
return -1;
}
return libssh2_channel_free(sftp->channel);
}
/* }}} */
/* *******************************
* SFTP File and Directory Ops *
******************************* */
/* {{{ libssh2_sftp_open_ex
*
*/
LIBSSH2_API LIBSSH2_SFTP_HANDLE *libssh2_sftp_open_ex(LIBSSH2_SFTP *sftp, char *filename, unsigned int filename_len, unsigned long flags, long mode, int open_type)
{
if (!sftp)
{
return NULL;
}
LIBSSH2_CHANNEL *channel = sftp->channel;
LIBSSH2_SESSION *session = channel->session;
LIBSSH2_SFTP_HANDLE *fp;
LIBSSH2_SFTP_ATTRIBUTES attrs = { LIBSSH2_SFTP_ATTR_PERMISSIONS };
unsigned long data_len, packet_len = filename_len + 13 + ((open_type == LIBSSH2_SFTP_OPENFILE) ? (4 + libssh2_sftp_attrsize(&attrs)) : 0);
/* packet_len(4) + packet_type(1) + request_id(4) + filename_len(4) + flags(4) */
unsigned char *packet, *data, *s;
unsigned char fopen_responses[2] = { SSH_FXP_HANDLE, SSH_FXP_STATUS };
unsigned long request_id;
s = packet = LIBSSH2_ALLOC(session, packet_len);
if (!packet) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate memory for FXP_OPEN or FXP_OPENDIR packet", 0);
return NULL;
}
/* Filetype in SFTP 3 and earlier */
attrs.permissions = mode | ((open_type == LIBSSH2_SFTP_OPENFILE) ? LIBSSH2_SFTP_ATTR_PFILETYPE_FILE : LIBSSH2_SFTP_ATTR_PFILETYPE_DIR);
libssh2_htonu32(s, packet_len - 4); s += 4;
*(s++) = (open_type == LIBSSH2_SFTP_OPENFILE) ? SSH_FXP_OPEN : SSH_FXP_OPENDIR;
request_id = sftp->request_id++;
libssh2_htonu32(s, request_id); s += 4;
libssh2_htonu32(s, filename_len); s += 4;
memcpy(s, filename, filename_len); s += filename_len;
if (open_type == LIBSSH2_SFTP_OPENFILE) {
libssh2_htonu32(s, flags); s += 4;
s += libssh2_sftp_attr2bin(s, &attrs);
}
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Sending %s open request", (open_type == LIBSSH2_SFTP_OPENFILE) ? "file" : "directory");
#endif
if (packet_len != libssh2_channel_write(channel, packet, packet_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send FXP_OPEN or FXP_OPENDIR command", 0);
LIBSSH2_FREE(session, packet);
return NULL;
}
LIBSSH2_FREE(session, packet);
if (libssh2_sftp_packet_requirev(sftp, 2, fopen_responses, request_id, &data, &data_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for status message", 0);
return NULL;
}
if (data[0] == SSH_FXP_STATUS) {
libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL, "Failed opening remote file", 0);
sftp->last_errno = libssh2_ntohu32(data + 5);
LIBSSH2_FREE(session, data);
return NULL;
}
fp = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_SFTP_HANDLE));
if (!fp) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate new SFTP handle structure", 0);
LIBSSH2_FREE(session, data);
return NULL;
}
memset(fp, 0, sizeof(LIBSSH2_SFTP_HANDLE));
fp->handle_type = (open_type == LIBSSH2_SFTP_OPENFILE) ? LIBSSH2_SFTP_HANDLE_FILE : LIBSSH2_SFTP_HANDLE_DIR;
fp->handle_len = libssh2_ntohu32(data + 5);
if (fp->handle_len > 256) {
/* SFTP doesn't allow handles longer than 256 characters */
fp->handle_len = 256;
}
fp->handle = LIBSSH2_ALLOC(session, fp->handle_len);
if (!fp->handle) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate space for SFTP file/dir handle", 0);
LIBSSH2_FREE(session, data);
LIBSSH2_FREE(session, fp);
return NULL;
}
memcpy(fp->handle, data + 9, fp->handle_len);
LIBSSH2_FREE(session, data);
/* Link the file and the sftp session together */
fp->next = sftp->handles;
if (fp->next) {
fp->next->prev = fp;
}
fp->sftp = sftp;
fp->u.file.offset = 0;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Open command successful");
#endif
return fp;
}
/* }}} */
/* {{{ libssh2_sftp_read
* Read from an SFTP file handle
*/
LIBSSH2_API size_t libssh2_sftp_read(LIBSSH2_SFTP_HANDLE *handle, char *buffer, size_t buffer_maxlen)
{
if (!handle)
{
return -1;
}
LIBSSH2_SFTP *sftp = handle->sftp;
LIBSSH2_CHANNEL *channel = sftp->channel;
LIBSSH2_SESSION *session = channel->session;
unsigned long data_len, request_id;
unsigned long packet_len = handle->handle_len + 25; /* packet_len(4) + packet_type(1) + request_id(4) + handle_len(4) + offset(8) + length(4) */
unsigned char *packet, *s, *data;
unsigned char read_responses[2] = { SSH_FXP_DATA, SSH_FXP_STATUS };
size_t bytes_read = 0;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Reading %lu bytes from SFTP handle", (unsigned long)buffer_maxlen);
#endif
s = packet = LIBSSH2_ALLOC(session, packet_len);
if (!packet) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate memory for FXP_CLOSE packet", 0);
return -1;
}
libssh2_htonu32(s, packet_len - 4); s += 4;
*(s++) = SSH_FXP_READ;
request_id = sftp->request_id++;
libssh2_htonu32(s, request_id); s += 4;
libssh2_htonu32(s, handle->handle_len); s += 4;
memcpy(s, handle->handle, handle->handle_len); s += handle->handle_len;
libssh2_htonu64(s, handle->u.file.offset); s += 8;
libssh2_htonu32(s, buffer_maxlen); s += 4;
if (packet_len != libssh2_channel_write(channel, packet, packet_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send FXP_READ command", 0);
LIBSSH2_FREE(session, packet);
return -1;
}
LIBSSH2_FREE(session, packet);
if (libssh2_sftp_packet_requirev(sftp, 2, read_responses, request_id, &data, &data_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for status message", 0);
return -1;
}
switch (data[0]) {
case SSH_FXP_STATUS:
sftp->last_errno = libssh2_ntohu32(data + 5);
libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL, "SFTP Protocol Error", 0);
LIBSSH2_FREE(session, data);
return -1;
case SSH_FXP_DATA:
bytes_read = libssh2_ntohu32(data + 5);
if (bytes_read > (data_len - 9)) {
return -1;
}
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "%lu bytes returned", (unsigned long)bytes_read);
#endif
memcpy(buffer, data + 9, bytes_read);
handle->u.file.offset += bytes_read;
LIBSSH2_FREE(session, data);
return bytes_read;
}
return -1;
}
/* }}} */
/* {{{ libssh2_sftp_readdir
* Read from an SFTP directory handle
*/
LIBSSH2_API int libssh2_sftp_readdir(LIBSSH2_SFTP_HANDLE *handle, char *buffer, size_t buffer_maxlen, LIBSSH2_SFTP_ATTRIBUTES *attrs)
{
if (!handle)
{
return -1;
}
LIBSSH2_SFTP *sftp = handle->sftp;
LIBSSH2_CHANNEL *channel = sftp->channel;
LIBSSH2_SESSION *session = channel->session;
LIBSSH2_SFTP_ATTRIBUTES attrs_dummy;
unsigned long data_len, request_id, filename_len, num_names;
unsigned long packet_len = handle->handle_len + 13; /* packet_len(4) + packet_type(1) + request_id(4) + handle_len(4) */
unsigned char *packet, *s, *data;
unsigned char read_responses[2] = { SSH_FXP_NAME, SSH_FXP_STATUS };
if (handle->u.dir.names_left) {
/* A prior request returned more than one directory entry, feed it back from the buffer */
unsigned char *s = (unsigned char *)handle->u.dir.next_name;
unsigned long real_filename_len = libssh2_ntohu32(s);
filename_len = real_filename_len; s += 4;
if (filename_len > buffer_maxlen) {
filename_len = buffer_maxlen;
}
memcpy(buffer, s, filename_len); s += real_filename_len;
/* Skip longname */
s += 4 + libssh2_ntohu32(s);
if (attrs) {
memset(attrs, 0, sizeof(LIBSSH2_SFTP_ATTRIBUTES));
}
s += libssh2_sftp_bin2attr(attrs ? attrs : &attrs_dummy, s);
handle->u.dir.next_name = (char *)s;
if ((--handle->u.dir.names_left) == 0) {
LIBSSH2_FREE(session, handle->u.dir.names_packet);
}
return filename_len;
}
/* Request another entry(entries?) */
s = packet = LIBSSH2_ALLOC(session, packet_len);
if (!packet) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate memory for FXP_READDIR packet", 0);
return -1;
}
libssh2_htonu32(s, packet_len - 4); s += 4;
*(s++) = SSH_FXP_READDIR;
request_id = sftp->request_id++;
libssh2_htonu32(s, request_id); s += 4;
libssh2_htonu32(s, handle->handle_len); s += 4;
memcpy(s, handle->handle, handle->handle_len); s += handle->handle_len;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Reading entries from directory handle");
#endif
if (packet_len != libssh2_channel_write(channel, packet, packet_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send FXP_READ command", 0);
LIBSSH2_FREE(session, packet);
return -1;
}
LIBSSH2_FREE(session, packet);
if (libssh2_sftp_packet_requirev(sftp, 2, read_responses, request_id, &data, &data_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for status message", 0);
return -1;
}
if (data[0] == SSH_FXP_STATUS) {
int retcode;
retcode = libssh2_ntohu32(data + 5);
LIBSSH2_FREE(session, data);
if (retcode == LIBSSH2_FX_EOF) {
return 0;
} else {
sftp->last_errno = retcode;
libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL, "SFTP Protocol Error", 0);
return -1;
}
}
num_names = libssh2_ntohu32(data + 5);
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "%lu entries returned", num_names);
#endif
if (num_names <= 0) {
LIBSSH2_FREE(session, data);
return (num_names == 0) ? 0 : -1;
}
if (num_names == 1) {
unsigned long real_filename_len = libssh2_ntohu32(data + 9);
filename_len = real_filename_len;
if (filename_len > buffer_maxlen) {
filename_len = buffer_maxlen;
}
memcpy(buffer, data + 13, filename_len);
/* The filename is not null terminated, make it so if possible */
if (filename_len < buffer_maxlen) {
buffer[filename_len] = '\0';
}
if (attrs) {
memset(attrs, 0, sizeof(LIBSSH2_SFTP_ATTRIBUTES));
libssh2_sftp_bin2attr(attrs, data + 13 + real_filename_len + (4 + libssh2_ntohu32(data + 13 + real_filename_len)));
}
LIBSSH2_FREE(session, data);
return filename_len;
}
handle->u.dir.names_left = num_names;
handle->u.dir.names_packet = data;
handle->u.dir.next_name = (char *)data + 9;
/* Be lazy, just use the name popping mechanism from the start of the function */
return libssh2_sftp_readdir(handle, buffer, buffer_maxlen, attrs);
}
/* }}} */
/* {{{ libssh2_sftp_write
* Write data to a file handle
*/
LIBSSH2_API size_t libssh2_sftp_write(LIBSSH2_SFTP_HANDLE *handle, const char *buffer, size_t count)
{
if (!handle)
{
return -1;
}
LIBSSH2_SFTP *sftp = handle->sftp;
LIBSSH2_CHANNEL *channel = sftp->channel;
LIBSSH2_SESSION *session = channel->session;
unsigned long data_len, request_id, retcode;
unsigned long packet_len = handle->handle_len + count + 25; /* packet_len(4) + packet_type(1) + request_id(4) + handle_len(4) + offset(8) + count(4) */
unsigned char *packet, *s, *data;
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Writing %lu bytes", (unsigned long)count);
#endif
s = packet = LIBSSH2_ALLOC(session, packet_len);
if (!packet) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate memory for FXP_WRITE packet", 0);
return -1;
}
libssh2_htonu32(s, packet_len - 4); s += 4;
*(s++) = SSH_FXP_WRITE;
request_id = sftp->request_id++;
libssh2_htonu32(s, request_id); s += 4;
libssh2_htonu32(s, handle->handle_len); s += 4;
memcpy(s, handle->handle, handle->handle_len); s += handle->handle_len;
libssh2_htonu64(s, handle->u.file.offset); s += 8;
libssh2_htonu32(s, count); s += 4;
memcpy(s, buffer, count); s += count;
if (packet_len != libssh2_channel_write(channel, packet, packet_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send FXP_WRITE command", 0);
LIBSSH2_FREE(session, packet);
return -1;
}
LIBSSH2_FREE(session, packet);
if (libssh2_sftp_packet_require(sftp, SSH_FXP_STATUS, request_id, &data, &data_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for status message", 0);
return -1;
}
retcode = libssh2_ntohu32(data + 5);
LIBSSH2_FREE(session, data);
if (retcode == LIBSSH2_FX_OK) {
handle->u.file.offset += count;
return count;
}
libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL, "SFTP Protocol Error", 0);
sftp->last_errno = retcode;
return -1;
}
/* }}} */
/* {{{ libssh2_sftp_fstat_ex
* Get or Set stat on a file
*/
LIBSSH2_API int libssh2_sftp_fstat_ex(LIBSSH2_SFTP_HANDLE *handle, LIBSSH2_SFTP_ATTRIBUTES *attrs, int setstat)
{
if (!handle)
{
return -1;
}
LIBSSH2_SFTP *sftp = handle->sftp;
LIBSSH2_CHANNEL *channel = sftp->channel;
LIBSSH2_SESSION *session = channel->session;
unsigned long data_len, request_id;
unsigned long packet_len = handle->handle_len + 13 + (setstat ? libssh2_sftp_attrsize(attrs) : 0);
/* packet_len(4) + packet_type(1) + request_id(4) + handle_len(4) */
unsigned char *packet, *s, *data;
unsigned char fstat_responses[2] = { SSH_FXP_ATTRS, SSH_FXP_STATUS };
#ifdef LIBSSH2_DEBUG_SFTP
_libssh2_debug(session, LIBSSH2_DBG_SFTP, "Issuing %s command", setstat ? "set-stat" : "stat");
#endif
s = packet = LIBSSH2_ALLOC(session, packet_len);
if (!packet) {
libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate memory for FSTAT/FSETSTAT packet", 0);
return -1;
}
libssh2_htonu32(s, packet_len - 4); s += 4;
*(s++) = setstat ? SSH_FXP_FSETSTAT : SSH_FXP_FSTAT;
request_id = sftp->request_id++;
libssh2_htonu32(s, request_id); s += 4;
libssh2_htonu32(s, handle->handle_len); s += 4;
memcpy(s, handle->handle, handle->handle_len); s += handle->handle_len;
if (setstat) {
s += libssh2_sftp_attr2bin(s, attrs);
}
if (packet_len != libssh2_channel_write(channel, packet, packet_len)) {
libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, setstat ? "Unable to send FXP_FSETSTAT" : "Unable to send FXP_FSTAT command", 0);
LIBSSH2_FREE(session, packet);
return -1;
}
LIBSSH2_FREE(session, packet);