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SftpClient.cpp
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/******************************************************************************/
/* */
/* Copyright (c) 2010, 2014 Sylwester Wysocki <[email protected]> */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining a */
/* copy of this software and associated documentation files (the "Software"), */
/* to deal in the Software without restriction, including without limitation */
/* the rights to use, copy, modify, merge, publish, distribute, sublicense, */
/* and/or sell copies of the Software, and to permit persons to whom the */
/* Software is furnished to do so, subject to the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be included in */
/* all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR */
/* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, */
/* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL */
/* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER */
/* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING */
/* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER */
/* DEALINGS IN THE SOFTWARE. */
/* */
/******************************************************************************/
#include <cstdio>
#include <stdint.h>
#include <string>
#include <cstdlib>
#include <Tegenaria/Debug.h>
#include <Tegenaria/Str.h>
#ifdef WIN32
# include <windows.h>
# include <io.h>
#else
# include <sys/socket.h>
#endif
#include <fcntl.h>
#include <sys/stat.h>
#include "SftpClient.h"
#include "SftpJob.h"
#include "Sftp.h"
#include "Utils.h"
namespace Tegenaria
{
using std::string;
using std::min;
#ifndef MAX_PATH
#define MAX_PATH 260
#endif
//
// ----------------------------------------------------------------------------
//
// Constructors and destructors.
//
// ----------------------------------------------------------------------------
//
//
// Create SFTP client over given CRT FD pair.
//
// TIP: To initiate session with server on other side
// use connect() method.
//
// fdin - FD for input data (IN).
// fdout - FD for output data (IN).
// timeout - I/O timeout in ms, -1 means infinite (IN).
//
// fdType - set SFTP_CLIENT_FD if fdin/fdout are CRT FDs and
// SFTP_CLIENT_SOCKET if fdin/fdout are sockets.
// Defaulted to SFTP_CLIENT_FD if skipped (IN/OPT).
//
SftpClient::SftpClient(int fdin, int fdout, int timeout, int fdType)
{
DBG_ENTER3("SftpClient");
DBG_SET_ADD("SftpClient", this, "%d/%d", fdin, fdout);
fdin_ = fdin;
fdout_ = fdout;
timeout_ = timeout;
fdType_ = fdType;
sectorSize_ = SFTP_DEFAULT_SECTOR_SIZE;
dead_ = 0;
connectionDroppedCallback_ = NULL;
connectionDroppedCallbackCtx_ = NULL;
mutex_.setName("SftpClient");
//
// Init request pool.
//
rpool_ = new RequestPool(8, "SftpClient");
//
// Init network statistics.
//
netStatTick_ = SFTP_NETSTAT_DEFAULT_TICK;
netStatCallback_ = NULL;
netStatCallbackCtx_ = NULL;
partialReadThreshold_ = SFTP_PARTIAL_READ_TIMEOUT * 1000;
partialWriteThreshold_ = SFTP_PARTIAL_WRITE_TIMEOUT * 1000;
netstat_.reset();
DBG_LEAVE3("SftpClient");
}
//
// Shutdown connection if any.
//
SftpClient::~SftpClient()
{
DBG_ENTER3("SftpClient::~SftpClient");
disconnect();
delete rpool_;
DBG_SET_DEL("SftpClient", this);
DBG_LEAVE3("SftpClient::~SftpClient");
}
//
// ----------------------------------------------------------------------------
//
// SFTP session negotiation
//
// ----------------------------------------------------------------------------
//
//
// Establish connection with sftp-server.
//
// Sends : SSH2_FXP_INIT packet.
// Expects : SSH2_VERSION packet.
//
// RETURNS: 0 if OK.
//
int SftpClient::connect()
{
DBG_ENTER3("Connect::connect");
int exitCode = -1;
string packet;
//
// Process SSH2_FXP_INIT packet.
//
StrPushDword(packet, 5, STR_BIG_ENDIAN);
StrPushByte(packet, SSH2_FXP_INIT);
StrPushDword(packet, SSH2_FILEXFER_VERSION, STR_BIG_ENDIAN);
FAIL(processPacketSimple(packet, packet));
DBG_INFO("Established connection with server.\n");
netstat_.reset();
//
// Start thread loop.
//
readThread_ = ThreadCreate(readLoop, this);
//
// Error handler.
//
exitCode = 0;
fail:
if (exitCode)
{
Error("ERROR: Cannot connect to server.\n");
}
DBG_LEAVE3("Connect::connect");
return exitCode;
}
//
// Disconnect existing connection with sftp server.
//
void SftpClient::disconnect()
{
DEBUG1("WARNING: SftpClient::disconnect not implemented.");
}
//
// Close existing connection with server and reinit it once again
// from begin.
//
int SftpClient::reconnect()
{
Error("ERROR: SftpClient::reconnect is not implemented.\n");
return -1;
}
//
// ----------------------------------------------------------------------------
//
// Wrapper for standard SSH2_FXP_XXX commands.
//
// ----------------------------------------------------------------------------
//
//
// Open remote file or directory.
//
// Sends : SSH2_FXP_OPEN or SSH2_FXP_OPENDIR packet.
// Expect : SSH2_FXP_HANDLE or SSSH2_FXP_STATUS packet.
//
// path - path to remote file or directory (IN).
// mode - sftp access mode (IN).
// isDir - set to 1 for directory, 0 otherwise (IN).
//
// RETURNS: handle assigned by sftp-server
// or -1 if error.
//
int64_t SftpClient::open(const char *path, int mode, int isDir)
{
DBG_ENTER3("SftpClient::open");
int exitCode = -1;
string packet;
int64_t handle = -1;
uint32_t handleSize = -1;
int pathLen = strlen(path);
uint32_t id = GenerateUniqueId();
uint32_t idRet = 0;
uint32_t serverStatus = SSH2_FX_FAILURE;
uint32_t size = 0;
uint8_t type = 0;
DEBUG1("SFTP #%d: opening %s [%s] mode [0x%x].",
id, isDir ? "directory" : "file", path, mode);
FAILEX(dead_, "SFTP #%d: rejected because session dead.\n", id);
//
// Prepare SSH2_FXP_OPEN packet:
//
// size 4
// SSH2_FXP_OPEN 1
// id 4
// pathLen 4
// path pathLen
// mode 4 (for file only)
// attribs 4 (for file only)
// ----------------------------------
// total: 17 + 4 + <pathLen>
//
if (isDir)
{
DEBUG2("SFTP #%d: Preparing SSH2_FXP_OPENDIR packet...", id);
type = SSH2_FXP_OPENDIR;
size = 9 + pathLen;
}
else
{
DEBUG2("SFTP #%d: Preparing SSH2_FXP_OPEN packet...", id);
type = SSH2_FXP_OPEN;
size = 17 + pathLen;
}
StrPushDword(packet, size, STR_BIG_ENDIAN); // size 4
StrPushByte(packet, type); // type 1
StrPushDword(packet, id, STR_BIG_ENDIAN); // id 4
StrPushDword(packet, pathLen, STR_BIG_ENDIAN); // pathLen 4
StrPushRaw(packet, path, pathLen); // path pathLen
if (isDir == 0)
{
StrPushDword(packet, mode, STR_BIG_ENDIAN); // mode 4
StrPushDword(packet, 0, STR_BIG_ENDIAN); // attr 4
}
//
// Send packet and wait for answer.
//
FAIL(processPacket(packet, packet));
//
// Parse answer.
//
// size 4
// type 1
// id 4
// ...
//
FAIL(StrPopDword(&size, packet, STR_BIG_ENDIAN)); // size 4
FAIL(StrPopByte(&type, packet)); // type 1
FAIL(StrPopDword(&idRet, packet, STR_BIG_ENDIAN)); // id 4
if (idRet != id)
{
Error("ERROR: Packet ID mismatch.\n");
shutdown();
goto fail;
}
//
// Check packet type.
//
switch(type)
{
//
// SSH2_FXP_HANDLE with opened server side handle.
// It means success.
//
// handleSize 4
// handle handleSize
//
case SSH2_FXP_HANDLE:
{
uint32_t tmp;
DEBUG2("SFTP #%d: Received [SSH2_FXP_HANDLE].", id);
//
// FIXME: Handle 64-bit handle.
//
FAIL(StrPopDword(&handleSize, packet, STR_BIG_ENDIAN));
FAILEX(handleSize != 4, "ERROR: Unsupported handle size [%d].\n", handleSize);
FAIL(StrPopDword(&tmp, packet, STR_BIG_ENDIAN));
handle = tmp;
DEBUG1("SFTP #%d: Opened [%s] as remote handle [%"PRId64"].\n", id, path, handle);
break;
}
//
// SSH2_FXP_STATUS feans errors on server side.
// Probably access denied.
//
case SSH2_FXP_STATUS:
{
DEBUG2("SFTP #%d: Received [SSH2_FXP_STATUS].", id);
FAIL(StrPopDword(&serverStatus, packet, STR_BIG_ENDIAN));
DEBUG1("SFTP #%d: Open [%s] failed with server code [%d][%s].\n",
id, path, serverStatus, TranslateSftpStatus(serverStatus));
break;
}
//
// Fatal error. Unexpected packet type.
//
default:
{
Error("ERROR: Unexpected packet type [%d].\n", type);
shutdown();
goto fail;
}
}
if (handle >= 0)
{
DBG_SET_ADD("sftp handle", handle, "[%s]", path);
}
//
// Cleanup.
//
exitCode = 0;
fail:
if (exitCode < 0)
{
DBG_MSG("Cannot open remote resource.\n"
"Error code is: %u.\nServer status is : [%d][%s].",
GetLastError(), serverStatus,
TranslateSftpStatus(serverStatus));
handle = -1;
}
DBG_LEAVE3("SftpClient::open");
return handle;
}
//
// Open remote directory.
// Works as open with isDir set to 1.
// See SftpClient::open().
//
int64_t SftpClient::opendir(const char *path)
{
return open(path, 0, 1);
}
//
// Close remote handle on server.
//
// Sends : SSH2_FXP_CLOSE packet.
// Expect : SSH2_FXP_STATUS packet.
//
// handle - handle value retrieved from open() before (IN).
//
// RETURNS: 0 if OK.
//
int SftpClient::close(int64_t handle)
{
DBG_ENTER3("SftpClient::close");
uint32_t serverStatus = SSH2_FX_FAILURE;
uint32_t id = GenerateUniqueId();
uint32_t size = 0;
uint32_t idRet = 0;
uint8_t type = 0;
string packet;
DEBUG1("SFTP #%d: close handle [%"PRId64"].", id, handle);
FAILEX(dead_, "SFTP #%d: rejected because session dead.\n", id);
//
// Prepare SSH2_FXP_CLOSE packet:
//
// size 4
// SSH2_FXP_CLOSE 1
// id 4
// handleLen 4
// handle 4
// ----------------------------------
// total: 13 + 4
//
DEBUG2("SFTP #%d: Preparing SSH2_FXP_CLOSE packet...", id);
StrPushDword(packet, 13, STR_BIG_ENDIAN); // size 4
StrPushByte(packet, SSH2_FXP_CLOSE); // type 1
StrPushDword(packet, id, STR_BIG_ENDIAN); // id 4
StrPushDword(packet, 4, STR_BIG_ENDIAN); // handleLen 4
StrPushDword(packet, uint32_t(handle), STR_BIG_ENDIAN); // handle 4
//
// Send packet and wait for answer.
//
FAIL(processPacket(packet, packet));
//
// Receive status packet.
//
serverStatus = popStatusPacket(packet, id);
FAIL(serverStatus != SSH2_FX_OK);
DBG_SET_DEL("sftp handle", handle);
//
// Error handler.
//
fail:
DEBUG1("SFTP #%d: Close handle [%"PRId64"] finished with code [%d].\n",
id, handle, serverStatus);
DBG_LEAVE3("SftpClient::close");
return serverStatus;
}
//
// Close many remote handles in one request.
//
// Sends : SSH2_FXP_DIRLIGO_MULTICLOSE packet.
// Expect : SSH2_FXP_STATUS packet.
//
// handle - list of handles value retrieved from open() before (IN).
//
// RETURNS: 0 if OK.
//
int SftpClient::multiclose(vector<int64_t> &handles)
{
DBG_ENTER3("SftpClient::multiclose");
uint32_t serverStatus = SSH2_FX_FAILURE;
uint32_t id = GenerateUniqueId();
uint32_t size = 0;
uint32_t idRet = 0;
uint32_t packetSize;
uint8_t type = 0;
string packet;
#ifdef DEBUG
{
string handlesListStr;
for (int i = 0; i < handles.size(); i++)
{
char buf[32];
snprintf(buf, sizeof(buf) - 1, "%I64d, ", handles[i]);
handlesListStr += buf;
}
DEBUG1("SFTP #%d: multi-close {%s}.", id, handlesListStr.c_str());
}
#endif
FAILEX(dead_, "SFTP #%d: rejected because session dead.\n", id);
//
// Don't run request if handles lilst is empty.
//
if (handles.size() > 0)
{
//
// Prepare SSH2_FXP_DIRLIGO_MULTICLOSE packet:
//
// size 4
// SSH2_FXP_MULTICLOSE 1
// id 4
// count 4
// handle 4 x n times
// ----------------------------------
// total: 13 + 4 * nHandles
//
DEBUG2("SFTP #%d: Preparing SSH2_FXP_MULTICLOSE packet...", id);
packetSize = 9 + 4 * handles.size();
StrPushDword(packet, packetSize, STR_BIG_ENDIAN); // size 4
StrPushByte(packet, SSH2_FXP_DIRLIGO_MULTICLOSE); // type 1
StrPushDword(packet, id, STR_BIG_ENDIAN); // id 4
StrPushDword(packet, handles.size(), STR_BIG_ENDIAN); // count 4
for (int i = 0; i < handles.size(); i++)
{
StrPushDword(packet, uint32_t(handles[i]), STR_BIG_ENDIAN); // handle 4
}
//
// Send packet and wait for answer.
//
FAIL(processPacket(packet, packet));
//
// Receive status packet.
//
serverStatus = popStatusPacket(packet, id);
FAIL(serverStatus != SSH2_FX_OK);
for (int i = 0; i < handles.size(); i++)
{
DBG_SET_DEL("sftp handle", handles[i]);
}
}
//
// Error handler.
//
fail:
DEBUG1("SFTP #%d: multi-close finished with code [%d].\n", id, serverStatus);
DBG_LEAVE3("SftpClient::multiclose");
return serverStatus;
}
//
// Reset directory handle. If readdir() finished with EOF on given handle
// resetdir() request will reopen directory on server to make the same handle
// possible to reuse in another readdir() request.
//
// Sends : SSH2_FXP_DIRLIGO_RESETDIR packet.
// Expect : SSH2_FXP_STATUS packet.
//
// handle - handle value retrieved from opendir() before (IN).
//
// RETURNS: 0 if OK.
//
int SftpClient::resetdir(int64_t handle)
{
DBG_ENTER3("SftpClient::resetdir");
uint32_t serverStatus = SSH2_FX_FAILURE;
uint32_t id = GenerateUniqueId();
uint32_t size = 0;
uint32_t idRet = 0;
uint32_t packetSize;
uint8_t type = 0;
string packet;
DEBUG1("SFTP #%d: resetdir [%I64d].", id, handle);
FAILEX(dead_, "SFTP #%d: rejected because session dead.\n", id);
//
// Prepare SSH2_FXP_DIRLIGO_RESETDIR packet:
//
// size 4
// SSH2_FXP_RESETDIR 1
// id 4
// handle 4
// ----------------------------------
// total: 13
//
DEBUG2("SFTP #%d: Preparing SSH2_FXP_RESETDIR packet...", id);
StrPushDword(packet, 9, STR_BIG_ENDIAN); // size 4
StrPushByte(packet, SSH2_FXP_DIRLIGO_RESETDIR); // type 1
StrPushDword(packet, id, STR_BIG_ENDIAN); // id 4
StrPushDword(packet, int32_t(handle), STR_BIG_ENDIAN); // handle 4
//
// Send packet and wait for answer.
//
FAIL(processPacket(packet, packet));
//
// Receive status packet.
//
serverStatus = popStatusPacket(packet, id);
FAIL(serverStatus != SSH2_FX_OK);
//
// Error handler.
//
fail:
DEBUG1("SFTP #%d: resetdir finished with code [%d].\n", id, serverStatus);
DBG_LEAVE3("SftpClient::resetdir");
return serverStatus;
}
//
// Read data from remote file.
//
// Sends : many SSH2_FXP_READ.
// Expect : many SSH2_FXP_DATA and one SSH2_FXP_STATUS for EOF signal.
//
// handle - handle retrieved from open() before (IN).
// buffer - buffer, where to store readed data (OUT).
// offset - file position of first byte to read (IN).
// bytesToRead - number of bytes to read (IN).
//
// RETURNS: Number of bytes readed,
// or -1 if error.
//
int SftpClient::read(int64_t handle, char *buffer, uint64_t offset, int bytesToRead)
{
DBG_ENTER3("SftpClient::read");
int exitCode = -1;
int goOn = 1;
int readed = 0;
double startTime = 0.0;
double endTime = 0.0;
double elapsed = 0.0;
double elapsedTotal = 0.0;
int pieceSize = 0;
uint32_t serverStatus = 0;
string packet;
DEBUG1("SFTP: read(%"PRId64", %p, %"PRId64", %d).", handle, buffer, offset, bytesToRead);
FAILEX(dead_, "SFTP: read() rejected because session dead.\n");
//
// Read packets unitil:
//
// - EOF.
// - error.
// - read time can exceed system I/O timeout
// (for big caller buffer or slow network).
//
while(goOn)
{
packet.clear();
uint32_t id = GenerateUniqueId();
uint32_t idRet = 0;
uint32_t size = 0;
uint8_t type = 0;
//
// Compute size of current piece.
//
pieceSize = min(bytesToRead - readed, sectorSize_);
//
// Prepare next SSH2_FXP_READ message.
//
// size 4
// type 1
// id 4
// handleLen 4
// handle 4 (32-bit)
// offset 8 (64-bit)
// bytesToRead 4
// -----------------------
// total: 25 + 4
//
DEBUG3("SFTP #%d: Preparing SSH2_FXP_READ packet...\n", id);
StrPushDword(packet, 25, STR_BIG_ENDIAN); // size 4
StrPushByte(packet, SSH2_FXP_READ); // type 1
StrPushDword(packet, id, STR_BIG_ENDIAN); // id 4
StrPushDword(packet, 4, STR_BIG_ENDIAN); // handleLen 4
StrPushDword(packet, uint32_t(handle), STR_BIG_ENDIAN); // handle 4
StrPushQword(packet, offset, STR_BIG_ENDIAN); // offset 8
StrPushDword(packet, pieceSize, STR_BIG_ENDIAN); // toRead 4
//
// Send SSH2_FXP_READ packet.
// Expect SSH2_FXP_DATA or SSH2_FXP_STATUS.
//
startTime = GetTimeMs();
FAIL(processPacket(packet, packet));
endTime = GetTimeMs();
elapsed = endTime - startTime;
DEBUG2("SFTP #%d: Sent [SSH2_FXP_READ] packet.\n", id);
//
// Pop header:
//
// size 4
// type 1
// id 4
//
FAIL(StrPopDword(&size, packet, STR_BIG_ENDIAN)); // size 4
FAIL(StrPopByte(&type, packet)); // type 1
FAIL(StrPopDword(&idRet, packet, STR_BIG_ENDIAN)); // id 4
if (idRet != id)
{
Error("ERROR: Packet ID mismatch.\n");
shutdown();
goto fail;
}
//
// Parse reveived packet.
//
switch(type)
{
//
// Next portion of readed data.
//
case SSH2_FXP_DATA:
{
DEBUG2("SFTP #%d: received [SSH2_FXP_DATA].", id);
uint32_t len = 0;
//
// Put reveived data to output buffer.
//
FAIL(StrPopDword(&len, packet, STR_BIG_ENDIAN));
DEBUG3("SFTP #%d: Excepting [%d] data bytes...", id, len);
if (packet.size() < len)
{
Error("ERROR: Received [%d] data, but [%d] expected.", packet.size(), len);
shutdown();
goto fail;
}
memcpy(buffer, &packet[0], len);
readed += len;
buffer += len;
offset += len;
//
// If we readed all expected data stop listening.
//
if (readed == bytesToRead)
{
DEBUG3("SFTP #%d: Reading completed.", id);
goOn = 0;
}
//
// Update statistics.
//
netstat_.insertDownloadEvent(len, elapsed);
break;
}
//
// Status message means EOF or error.
//
case SSH2_FXP_STATUS:
{
DEBUG2("SFTP #%d: received [SSH2_FXP_STATUS].\n", id);
FAIL(StrPopDword(&serverStatus, packet, STR_BIG_ENDIAN));
FAILEX(serverStatus != SSH2_FX_EOF,
"Read failed with server code [%d][%s].\n",
serverStatus, TranslateSftpStatus(serverStatus));
goOn = 0;
break;
}
//
// Unexpected packet's type.
//
default:
{
Error("SFTP #%d: ERROR: Unexpected packet type received [%d].", id, type);
shutdown();
goto fail;
}
}
//
// Check for timeout.
//
elapsedTotal += elapsed;
if (elapsedTotal > partialReadThreshold_)
{
Error("WARNING: Partial read triggered after %lf seconds.\n", elapsedTotal / 1000.0);
netstat_.triggerPartialRead();
if (netStatCallback_)
{
netStatCallback_(&netstat_, netStatCallbackCtx_);
}
goOn = 0;
}
}
//
// Clean up.
//
exitCode = 0;
fail:
if (exitCode)
{
Error("ERROR: Cannot read from remote file. Error code is: %u.\n"
"Server status: is [%d][%s].", GetLastError(),
serverStatus, TranslateSftpStatus(serverStatus));
}
DBG_LEAVE3("SftpClient::read");
return exitCode ? -1 : readed;
}
//
// Write data to remote file.
//
// Sends : many SSH2_FXP_WRITE packets.
// Expect : many SSH2_FXP_STATUS packets.
//
// handle - handle retrieved from open() before (IN).
// buffer - buffer with data, which we want to write (IN).
// offset - file position, where to start writing (IN).
// bytesToWrite - number of bytes to write (IN).
//
// RETURNS: Number of bytes written,
// or -1 if error.
//
int SftpClient::write(int64_t handle, char *buffer, uint64_t offset, int bytesToWrite)
{
DBG_ENTER3("SftpClient::write");
int exitCode = -1;
int written = 0;
int pieceSize = 0;
int goOn = 1;
double startTime = 0.0;
double endTime = 0.0;
double elapsed = 0.0;
double elapsedTotal = 0.0;