tgputtylibvcclass.cpp

//---------------------------------------------------------------------------

#pragma hdrstop

#include <stdio.h>
#include "tgputtylibvcclass.h"
//---------------------------------------------------------------------------

// callbacks

bool ls_callback(const struct fxp_names* names, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;

	if (TGPSFTP->OnListing != NULL)
		return TGPSFTP->OnListing(names);
	else
		return true;
}

const char* getpassword_callback(const char* prompt, const bool echo, bool* cancel, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;
	TGPSFTP->FPasswordAttempts++;
	if (TGPSFTP->FPasswordAttempts > 3)
	{
		(*cancel) = true;
		if (TGPSFTP->OnMessage != NULL)
			TGPSFTP->OnMessage("Password was rejected, or no password given.", true);
		return NULL;
	}
	else
	{
		(*cancel) = false;
		if (strstr(prompt, "Passphrase for key") != NULL)
			return TGPSFTP->KeyPassword.c_str();
		else
			return TGPSFTP->Password.c_str();
	}
}

void printmessage_callback(const char* msg, const bool isstderr, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;
	if (TGPSFTP->OnMessage != NULL)
		TGPSFTP->OnMessage(msg, isstderr);

	TGPSFTP->LastMessages += msg;
}

bool progress_callback(const uint64_t bytescopied, const bool isupload, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;
	if (TGPSFTP->OnProgress != NULL)
		return TGPSFTP->OnProgress(bytescopied, isupload);
	else
		return true;
}

int read_from_stream(const uint64_t offset, void* buffer, const int bufsize, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;
	// TO DO
	return 0;
}

int write_to_stream(const uint64_t offset, void* buffer, const int bufsize, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;
	// TO DO
	return 0;
}

bool get_input_callback(char* linebuf, const int maxchars, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;
	if (TGPSFTP->OnGetInput != NULL)
		return TGPSFTP->OnGetInput(linebuf, maxchars);
	else
	{
		fgets(linebuf, maxchars, stdin);
		return true;
	}
}

bool verify_host_key_callback(const char* host, const int port, const char* keytype,
	const char* keystr, const char* fingerprint,
	const int verificationstatus,
	bool* storehostkey, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;
	if (TGPSFTP->OnVerifyHostKey != NULL)
		return TGPSFTP->OnVerifyHostKey(host, port, fingerprint,
			verificationstatus, *storehostkey);
	else
		return false;
}

void raise_exception_callback(const char* msg, const char* srcfile, const int line, const void* libctx)
{
	TTGPuttySFTP* TGPSFTP = (TTGPuttySFTP*)((TTGLibraryContext*)libctx)->tag;
	throw TTGPuttySFTPException((std::string("TTGPuttySFTP exception ") +
		std::string(msg) +
		std::string(" at line ") +
		std::to_string(line) +
		std::string(" in ") +
		std::string(srcfile)).c_str());

}


TTGPuttySFTP::TTGPuttySFTP(const bool verbose)
{
	double puttyversion;
	int tgputtylibbuild;

	if (!LoadTGPuttyLib())
		throw TTGPuttySFTPException("tgputtylib could not be loaded");

	tgputtygetversions(&puttyversion, &tgputtylibbuild);
	if (tgputtylibbuild < MinimumLibraryBuildNum)
		throw TTGPuttySFTPException("tgputtylib is too old");

	FVerbose = verbose;
	FPort = 22;

	memset(&Fcontext, 0, sizeof(Fcontext));
	Fcontext.structsize = sizeof(Fcontext);
	if (Fcontext.structsize < tggetlibrarycontextsize())
		throw TTGPuttySFTPException("Incorrect TTGLibraryContext record size");

	Fcontext.tag = (__int64)this;
	
	Fcontext.ls_callback = ls_callback;
	Fcontext.getpassword_callback = getpassword_callback;
	Fcontext.printmessage_callback = printmessage_callback;
	Fcontext.progress_callback = progress_callback;
	Fcontext.read_from_stream = read_from_stream;
	Fcontext.write_to_stream = write_to_stream;
	Fcontext.get_input_callback = get_input_callback;
	Fcontext.raise_exception_callback = raise_exception_callback;
	Fcontext.verify_host_key_callback = verify_host_key_callback;
	
	if (tgputty_initcontext(verbose, &Fcontext) != 0)
		throw TTGPuttySFTPException("tgputty_initcontext failed - incorrect DLL version?");
}

TTGPuttySFTP::~TTGPuttySFTP()
{
	Disconnect();
	tgputtyfree(&Fcontext);
}

void TTGPuttySFTP::ClearStatus()
{
	FLastMessages[0] = '\0';
	Fcontext.fxp_errtype = cDummyClearedErrorCode; // "clear" error field
}

char* TTGPuttySFTP::GetHomeDir()
{
	return Fcontext.homedir;
}

char* TTGPuttySFTP::GetWorkDir()
{
	return Fcontext.pwd;
}

void TTGPuttySFTP::SetVerbose(const bool Value)
{
	tgputty_setverbose(Value);
	FVerbose = Value;
}

void TTGPuttySFTP::SetKeyfile(const char* Value)
{
	tgputty_setkeyfile(Value, &Fcontext);
}

#define cMaxVersionLen 100
char GVersionBuf[cMaxVersionLen];

char* TTGPuttySFTP::GetLibVersion()
{
	double puttyversion;
	int tgputtylibbuild;

	tgputtygetversions(&puttyversion, &tgputtylibbuild);

	snprintf(GVersionBuf, cMaxVersionLen, "tgputtylib build %d based on PuTTY Release %f",
		tgputtylibbuild, puttyversion);
	return GVersionBuf;
}

int TTGPuttySFTP::GetErrorCode()
{
	return Fcontext.fxp_errtype;
}

const char* TTGPuttySFTP::GetErrorMessage()
{
	return Fcontext.fxp_error_message;
}

std::string TTGPuttySFTP::MakePSFTPErrorMsg(const char* where)
{
	if (Fcontext.fxp_errtype >= 0)
		return std::string(where) +
		std::string(": Error ") +
		std::to_string(Fcontext.fxp_errtype) +
		std::string(", ") +
		std::string(Fcontext.fxp_error_message);
	else
		return std::string(where) +
		std::string(": Unknown Error.\n") +
		LastMessages;
}

void TTGPuttySFTP::Connect()
{
	FPasswordAttempts = 0;
	ClearStatus();
	int res = tgsftp_connect(FHostName.c_str(), FUserName.c_str(), FPort, FPassword.c_str(), &Fcontext);
	FConnected = (res == 0); // 0 = success
	if (!FConnected)
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_connect"));
}

void TTGPuttySFTP::Disconnect()
{
	if (FConnected)
	{
		tgsftp_close(&Fcontext);
		FConnected = false;
	}
}

void TTGPuttySFTP::ChangeDir(const char* ADirectory)
{
	ClearStatus();
	int res = tgsftp_cd(ADirectory, &Fcontext);
	if (res != 1)  // 1 = success
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_cd"));
}

void TTGPuttySFTP::MakeDir(const char* ADirectory)
{
	ClearStatus();
	int res = tgsftp_mkdir(ADirectory, &Fcontext);
	if (res != 1)  // 1 = success
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_mkdir"));
}

void TTGPuttySFTP::RemoveDir(const char* ADirectory)
{
	ClearStatus();
	int res = tgsftp_rmdir(ADirectory, &Fcontext);
	if (res != 1)  // 1 = success
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_rmdir"));
}

void TTGPuttySFTP::ListDir(const char* ADirectory)
{
	ClearStatus();
	int res = tgsftp_ls(ADirectory, &Fcontext);
	if (res != 1)  // 1 = success
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_ls"));
}

void TTGPuttySFTP::GetStat(const char* AFileName, Tfxp_attrs* Attrs)
{
	ClearStatus();
	if (!tgsftp_getstat(AFileName, Attrs, &Fcontext))
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_getstat"));
}

void TTGPuttySFTP::SetStat(const char* AFileName, struct fxp_attrs* Attrs)
{
	ClearStatus();
	if (!tgsftp_setstat(AFileName, Attrs, &Fcontext))
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_setstat"));
}

void TTGPuttySFTP::SetModifiedDate(const char* AFileName, const unsigned long unixtime)
{
	ClearStatus();
	struct fxp_attrs attrs;

	GetStat(AFileName, &attrs);
	attrs.flags = SSH_FILEXFER_ATTR_ACMODTIME; // set only this
	attrs.mtime = unixtime;

	SetStat(AFileName, &attrs);
}

void TTGPuttySFTP::SetFileSize(const char* AFileName, const __int64 ASize)
{
	ClearStatus();
	struct fxp_attrs attrs;

	GetStat(AFileName, &attrs);
	attrs.flags = SSH_FILEXFER_ATTR_SIZE; // set only this
	attrs.size = ASize;
	SetStat(AFileName, &attrs);
}

void TTGPuttySFTP::Move(const char* AFromName, const char* AToName)
{
	ClearStatus();
	int res = tgsftp_mv(AFromName, AToName, &Fcontext);
	if (res != 1)  // 1 = success
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_mv"));
}

void TTGPuttySFTP::Delete_File(const char* AName)
{
	ClearStatus();
	int res = tgsftp_rm(AName, &Fcontext);
	if (res != 1)  // 1 = success
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_rm"));
}

void TTGPuttySFTP::UploadFile(const char* ALocalFilename, const char* ARemoteFilename, const bool anAppend)
{
	ClearStatus();
	int res = tgsftp_putfile(ALocalFilename, ARemoteFilename, anAppend, &Fcontext);
	if (res != 1)  // 1 = success
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_putfile"));
}

void TTGPuttySFTP::DownloadFile(const char* ARemoteFilename, const char* ALocalFilename, const bool anAppend)
{
	ClearStatus();
	int res = tgsftp_getfile(ARemoteFilename, ALocalFilename, anAppend, &Fcontext);
	if (res != 1)  // 1 = success
		throw TTGPuttySFTPException(MakePSFTPErrorMsg("tgsftp_getfile"));
}

// void TTGPuttySFTP::UploadStream(const char *ARemoteFilename, System::Classes::TStream* const AStream, const bool anAppend);
// void TTGPuttySFTP::DownloadStream(const char *ARemoteFilename, System::Classes::TStream* const AStream, const bool anAppend);

void* TTGPuttySFTP::OpenFile(const char* apathname, const int anopenflags, const Pfxp_attrs attrs)
{
	return tgputty_openfile(apathname, anopenflags, attrs, &Fcontext);
}

int TTGPuttySFTP::CloseFile(struct fxp_handle*& fh)
{
	return tgputty_closefile(&fh, &Fcontext);
}

void* TTGPuttySFTP::xfer_upload_init(struct fxp_handle* fh, const unsigned __int64 offset)
{
	return tgputty_xfer_upload_init(fh, offset, &Fcontext);
}

bool TTGPuttySFTP::xfer_upload_ready(struct fxp_xfer* xfer)
{
	return tgputty_xfer_upload_ready(xfer, &Fcontext);
}

void TTGPuttySFTP::xfer_upload_data(struct fxp_xfer* xfer, char* buffer, const int len, const unsigned __int64 anoffset)
{
	tgputty_xfer_upload_data(xfer, buffer, len, anoffset, &Fcontext);
}

bool TTGPuttySFTP::xfer_ensuredone(struct fxp_xfer* xfer)
{
	return tgputty_xfer_ensuredone(xfer, &Fcontext);
}

bool TTGPuttySFTP::xfer_done(struct fxp_xfer* xfer)
{
	return tgputty_xfer_done(xfer, &Fcontext);
}

void TTGPuttySFTP::xfer_cleanup(struct fxp_xfer* xfer)
{
	tgputty_xfer_cleanup(xfer, &Fcontext);
}