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dcc.cpp
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dcc.cpp
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/*
* Copyright (C) 2004-2013 See the AUTHORS file for details.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <znc/znc.h>
#include <znc/Chan.h>
#include <znc/User.h>
#include <znc/Modules.h>
#include <znc/FileUtils.h>
using std::set;
class CDCCMod;
class CDCCSock : public CSocket {
public:
CDCCSock(CDCCMod* pMod, const CString& sRemoteNick, const CString& sLocalFile, unsigned long uFileSize = 0, CFile* pFile = NULL);
CDCCSock(CDCCMod* pMod, const CString& sRemoteNick, const CString& sRemoteIP, unsigned short uRemotePort, const CString& sLocalFile, unsigned long uFileSize);
virtual ~CDCCSock();
virtual void ReadData(const char* data, size_t len);
virtual void ConnectionRefused();
virtual void SockError(int iErrno, const CString& sDescription);
virtual void Timeout();
virtual void Connected();
virtual void Disconnected();
void SendPacket();
virtual Csock* GetSockObj(const CString& sHost, unsigned short uPort);
CFile* OpenFile(bool bWrite = true);
bool Seek(unsigned long int uPos);
// Setters
void SetRemoteIP(const CString& s) { m_sRemoteIP = s; }
void SetRemoteNick(const CString& s) { m_sRemoteNick = s; }
void SetFileName(const CString& s) { m_sFileName = s; }
void SetFileOffset(unsigned long u) { m_uBytesSoFar = u; }
// !Setters
// Getters
unsigned short GetUserPort() const { return m_uRemotePort; }
const CString& GetRemoteNick() const { return m_sRemoteNick; }
const CString& GetFileName() const { return m_sFileName; }
const CString& GetLocalFile() const { return m_sLocalFile; }
CFile* GetFile() { return m_pFile; }
double GetProgress() const { return ((m_uFileSize) && (m_uBytesSoFar)) ? (double) (((double) m_uBytesSoFar / (double) m_uFileSize) *100.0) : 0; }
bool IsSend() const { return m_bSend; }
//const CString& GetRemoteIP() const { return m_sRemoteIP; }
// !Getters
private:
protected:
CString m_sRemoteNick;
CString m_sRemoteIP;
CString m_sFileName;
CString m_sLocalFile;
CString m_sSendBuf;
unsigned short m_uRemotePort;
unsigned long long m_uFileSize;
unsigned long long m_uBytesSoFar;
bool m_bSend;
bool m_bNoDelFile;
CFile* m_pFile;
CDCCMod* m_pModule;
};
class CDCCMod : public CModule {
public:
MODCONSTRUCTOR(CDCCMod) {
AddHelpCommand();
AddCommand("Send", static_cast<CModCommand::ModCmdFunc>(&CDCCMod::SendCommand),
"<nick> <file>");
AddCommand("Get", static_cast<CModCommand::ModCmdFunc>(&CDCCMod::GetCommand),
"<file>");
AddCommand("ListTransfers", static_cast<CModCommand::ModCmdFunc>(&CDCCMod::ListTransfersCommand));
}
virtual ~CDCCMod() {}
#ifndef MOD_DCC_ALLOW_EVERYONE
virtual bool OnLoad(const CString& sArgs, CString& sMessage) {
if (!m_pUser->IsAdmin()) {
sMessage = "You must be admin to use the DCC module";
return false;
}
return true;
}
#endif
bool SendFile(const CString& sRemoteNick, const CString& sFileName) {
CString sFullPath = CDir::ChangeDir(GetSavePath(), sFileName, CZNC::Get().GetHomePath());
CDCCSock* pSock = new CDCCSock(this, sRemoteNick, sFullPath);
CFile* pFile = pSock->OpenFile(false);
if (!pFile) {
delete pSock;
return false;
}
unsigned short uPort = CZNC::Get().GetManager().ListenRand("DCC::LISTEN::" + sRemoteNick, m_pUser->GetLocalDCCIP(), false, SOMAXCONN, pSock, 120);
if (m_pUser->GetNick().Equals(sRemoteNick)) {
PutUser(":*dcc!znc@znc.in PRIVMSG " + sRemoteNick + " :\001DCC SEND " + pFile->GetShortName() + " " + CString(CUtils::GetLongIP(m_pUser->GetLocalDCCIP())) + " "
+ CString(uPort) + " " + CString(pFile->GetSize()) + "\001");
} else {
PutIRC("PRIVMSG " + sRemoteNick + " :\001DCC SEND " + pFile->GetShortName() + " " + CString(CUtils::GetLongIP(m_pUser->GetLocalDCCIP())) + " "
+ CString(uPort) + " " + CString(pFile->GetSize()) + "\001");
}
PutModule("DCC -> [" + sRemoteNick + "][" + pFile->GetShortName() + "] - Attempting Send.");
return true;
}
bool GetFile(const CString& sRemoteNick, const CString& sRemoteIP, unsigned short uRemotePort, const CString& sFileName, unsigned long uFileSize) {
if (CFile::Exists(sFileName)) {
PutModule("DCC <- [" + sRemoteNick + "][" + sFileName + "] - File already exists.");
return false;
}
CDCCSock* pSock = new CDCCSock(this, sRemoteNick, sRemoteIP, uRemotePort, sFileName, uFileSize);
if (!pSock->OpenFile()) {
delete pSock;
return false;
}
CZNC::Get().GetManager().Connect(sRemoteIP, uRemotePort, "DCC::GET::" + sRemoteNick, 60, false, m_pUser->GetLocalDCCIP(), pSock);
PutModule("DCC <- [" + sRemoteNick + "][" + sFileName + "] - Attempting to connect to [" + sRemoteIP + "]");
return true;
}
void SendCommand(const CString& sLine) {
CString sToNick = sLine.Token(1);
CString sFile = sLine.Token(2);
CString sAllowedPath = GetSavePath();
CString sAbsolutePath;
if ((sToNick.empty()) || (sFile.empty())) {
PutModule("Usage: Send <nick> <file>");
return;
}
sAbsolutePath = CDir::CheckPathPrefix(sAllowedPath, sFile);
if (sAbsolutePath.empty()) {
PutStatus("Illegal path.");
return;
}
SendFile(sToNick, sFile);
}
void GetCommand(const CString& sLine) {
CString sFile = sLine.Token(1);
CString sAllowedPath = GetSavePath();
CString sAbsolutePath;
if (sFile.empty()) {
PutModule("Usage: Get <file>");
return;
}
sAbsolutePath = CDir::CheckPathPrefix(sAllowedPath, sFile);
if (sAbsolutePath.empty()) {
PutModule("Illegal path.");
return;
}
SendFile(m_pUser->GetNick(), sFile);
}
void ListTransfersCommand(const CString& sLine) {
CTable Table;
Table.AddColumn("Type");
Table.AddColumn("State");
Table.AddColumn("Speed");
Table.AddColumn("Nick");
Table.AddColumn("IP");
Table.AddColumn("File");
set<CSocket*>::const_iterator it;
for (it = BeginSockets(); it != EndSockets(); ++it) {
CDCCSock* pSock = (CDCCSock*) *it;
Table.AddRow();
Table.SetCell("Nick", pSock->GetRemoteNick());
Table.SetCell("IP", pSock->GetRemoteIP());
Table.SetCell("File", pSock->GetFileName());
if (pSock->IsSend()) {
Table.SetCell("Type", "Sending");
} else {
Table.SetCell("Type", "Getting");
}
if (pSock->GetType() == Csock::LISTENER) {
Table.SetCell("State", "Waiting");
} else {
Table.SetCell("State", CString::ToPercent(pSock->GetProgress()));
Table.SetCell("Speed", CString((int)(pSock->GetAvgRead() / 1024.0)) + " KiB/s");
}
}
if (PutModule(Table) == 0) {
PutModule("You have no active DCC transfers.");
}
}
virtual void OnModCTCP(const CString& sMessage) {
if (sMessage.Equals("DCC RESUME ", false, 11)) {
CString sFile = sMessage.Token(2);
unsigned short uResumePort = sMessage.Token(3).ToUShort();
unsigned long uResumeSize = sMessage.Token(4).ToULong();
set<CSocket*>::const_iterator it;
for (it = BeginSockets(); it != EndSockets(); ++it) {
CDCCSock* pSock = (CDCCSock*) *it;
if (pSock->GetLocalPort() == uResumePort) {
if (pSock->Seek(uResumeSize)) {
PutModule("DCC -> [" + pSock->GetRemoteNick() + "][" + pSock->GetFileName() + "] - Attempting to resume from file position [" + CString(uResumeSize) + "]");
PutUser(":*dcc!znc@znc.in PRIVMSG " + m_pUser->GetNick() + " :\001DCC ACCEPT " + sFile + " " + CString(uResumePort) + " " + CString(uResumeSize) + "\001");
} else {
PutModule("DCC -> [" + m_pUser->GetNick() + "][" + sFile + "] Unable to find send to initiate resume.");
}
}
}
} else if (sMessage.Equals("DCC SEND ", false, 9)) {
CString sLocalFile = CDir::CheckPathPrefix(GetSavePath(), sMessage.Token(2));
if (sLocalFile.empty()) {
PutModule("Bad DCC file: " + sMessage.Token(2));
}
unsigned long uLongIP = sMessage.Token(3).ToULong();
unsigned short uPort = sMessage.Token(4).ToUShort();
unsigned long uFileSize = sMessage.Token(5).ToULong();
GetFile(m_pClient->GetNick(), CUtils::GetIP(uLongIP), uPort, sLocalFile, uFileSize);
}
}
};
CDCCSock::CDCCSock(CDCCMod* pMod, const CString& sRemoteNick, const CString& sLocalFile,
unsigned long uFileSize, CFile* pFile) : CSocket(pMod) {
m_sRemoteNick = sRemoteNick;
m_uFileSize = uFileSize;
m_uRemotePort = 0;
m_uBytesSoFar = 0;
m_pModule = pMod;
m_pFile = pFile;
m_sLocalFile = sLocalFile;
m_bSend = true;
m_bNoDelFile = false;
SetMaxBufferThreshold(0);
}
CDCCSock::CDCCSock(CDCCMod* pMod, const CString& sRemoteNick, const CString& sRemoteIP, unsigned short uRemotePort,
const CString& sLocalFile, unsigned long uFileSize) : CSocket(pMod) {
m_sRemoteNick = sRemoteNick;
m_sRemoteIP = sRemoteIP;
m_uRemotePort = uRemotePort;
m_uFileSize = uFileSize;
m_uBytesSoFar = 0;
m_pModule = pMod;
m_pFile = NULL;
m_sLocalFile = sLocalFile;
m_bSend = false;
m_bNoDelFile = false;
SetMaxBufferThreshold(0);
}
CDCCSock::~CDCCSock() {
if ((m_pFile) && (!m_bNoDelFile)) {
m_pFile->Close();
delete m_pFile;
}
}
void CDCCSock::ReadData(const char* data, size_t len) {
if (!m_pFile) {
DEBUG("File not open! closing get.");
m_pModule->PutModule(((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - File not open!");
Close();
}
// DCC specs says the receiving end sends the number of bytes it
// received so far as a 4 byte integer in network byte order, so we need
// uint32_t to do the job portably. This also means that the maximum
// file that we can transfer is 4 GiB big (see OpenFile()).
if (m_bSend) {
m_sSendBuf.append(data, len);
while (m_sSendBuf.size() >= 4) {
uint32_t iRemoteSoFar;
memcpy(&iRemoteSoFar, m_sSendBuf.data(), sizeof(iRemoteSoFar));
iRemoteSoFar = ntohl(iRemoteSoFar);
if ((iRemoteSoFar + 65536) >= m_uBytesSoFar) {
SendPacket();
}
m_sSendBuf.erase(0, 4);
}
} else {
m_pFile->Write(data, len);
m_uBytesSoFar += len;
uint32_t uSoFar = htonl((uint32_t)m_uBytesSoFar);
Write((char*) &uSoFar, sizeof(uSoFar));
if (m_uBytesSoFar >= m_uFileSize) {
Close();
}
}
}
void CDCCSock::ConnectionRefused() {
DEBUG(GetSockName() << " == ConnectionRefused()");
m_pModule->PutModule(((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - Connection Refused.");
}
void CDCCSock::Timeout() {
DEBUG(GetSockName() << " == Timeout()");
m_pModule->PutModule(((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - Timed Out.");
}
void CDCCSock::SockError(int iErrno, const CString& sDescription) {
DEBUG(GetSockName() << " == SockError(" << iErrno << ", " << sDescription << ")");
m_pModule->PutModule(((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - Socket Error [" + sDescription + "]");
}
void CDCCSock::Connected() {
DEBUG(GetSockName() << " == Connected(" << GetRemoteIP() << ")");
m_pModule->PutModule(((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - Transfer Started.");
if (m_bSend) {
SendPacket();
}
SetTimeout(120);
}
void CDCCSock::Disconnected() {
const CString sStart = ((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - ";
DEBUG(GetSockName() << " == Disconnected()");
if (m_uBytesSoFar > m_uFileSize) {
m_pModule->PutModule(sStart + "TooMuchData!");
} else if (m_uBytesSoFar == m_uFileSize) {
if (m_bSend) {
m_pModule->PutModule(sStart + "Completed! - Sent [" + m_sLocalFile +
"] at [" + CString((int) (GetAvgWrite() / 1024.0)) + " KiB/s ]");
} else {
m_pModule->PutModule(sStart + "Completed! - Saved to [" + m_sLocalFile +
"] at [" + CString((int) (GetAvgRead() / 1024.0)) + " KiB/s ]");
}
} else {
m_pModule->PutModule(sStart + "Incomplete!");
}
}
void CDCCSock::SendPacket() {
if (!m_pFile) {
m_pModule->PutModule(((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - File closed prematurely.");
Close();
return;
}
if (GetInternalWriteBuffer().size() > 1024 * 1024) {
// There is still enough data to be written, don't add more
// stuff to that buffer.
DEBUG("SendPacket(): Skipping send, buffer still full enough [" << GetInternalWriteBuffer().size() << "]["
<< m_sRemoteNick << "][" << m_sFileName << "]");
return;
}
char szBuf[4096];
ssize_t iLen = m_pFile->Read(szBuf, 4096);
if (iLen < 0) {
m_pModule->PutModule(((m_bSend) ? "DCC -> [" : "DCC <- [") + m_sRemoteNick + "][" + m_sFileName + "] - Error reading from file.");
Close();
return;
}
if (iLen > 0) {
Write(szBuf, iLen);
m_uBytesSoFar += iLen;
}
}
Csock* CDCCSock::GetSockObj(const CString& sHost, unsigned short uPort) {
Close();
CDCCSock* pSock = new CDCCSock(m_pModule, m_sRemoteNick, m_sLocalFile, m_uFileSize, m_pFile);
pSock->SetSockName("DCC::SEND::" + m_sRemoteNick);
pSock->SetTimeout(120);
pSock->SetFileName(m_sFileName);
pSock->SetFileOffset(m_uBytesSoFar);
m_bNoDelFile = true;
return pSock;
}
CFile* CDCCSock::OpenFile(bool bWrite) {
if ((m_pFile) || (m_sLocalFile.empty())) {
m_pModule->PutModule(((bWrite) ? "DCC <- [" : "DCC -> [") + m_sRemoteNick + "][" + m_sLocalFile + "] - Unable to open file.");
return NULL;
}
m_pFile = new CFile(m_sLocalFile);
if (bWrite) {
if (m_pFile->Exists()) {
delete m_pFile;
m_pFile = NULL;
m_pModule->PutModule("DCC <- [" + m_sRemoteNick + "] - File already exists [" + m_sLocalFile + "]");
return NULL;
}
if (!m_pFile->Open(O_WRONLY | O_TRUNC | O_CREAT)) {
delete m_pFile;
m_pFile = NULL;
m_pModule->PutModule("DCC <- [" + m_sRemoteNick + "] - Could not open file [" + m_sLocalFile + "]");
return NULL;
}
} else {
if (!m_pFile->IsReg()) {
delete m_pFile;
m_pFile = NULL;
m_pModule->PutModule("DCC -> [" + m_sRemoteNick + "] - Not a file [" + m_sLocalFile + "]");
return NULL;
}
if (!m_pFile->Open()) {
delete m_pFile;
m_pFile = NULL;
m_pModule->PutModule("DCC -> [" + m_sRemoteNick + "] - Could not open file [" + m_sLocalFile + "]");
return NULL;
}
// The DCC specs only allow file transfers with files smaller
// than 4GiB (see ReadData()).
unsigned long long uFileSize = m_pFile->GetSize();
if (uFileSize > (unsigned long long) 0xffffffffULL) {
delete m_pFile;
m_pFile = NULL;
m_pModule->PutModule("DCC -> [" + m_sRemoteNick + "] - File too large (>4 GiB) [" + m_sLocalFile + "]");
return NULL;
}
m_uFileSize = uFileSize;
}
m_sFileName = m_pFile->GetShortName();
return m_pFile;
}
bool CDCCSock::Seek(unsigned long int uPos) {
if (m_pFile) {
if (m_pFile->Seek(uPos)) {
m_uBytesSoFar = uPos;
return true;
}
}
return false;
}
template<> void TModInfo<CDCCMod>(CModInfo& Info) {
Info.SetWikiPage("dcc");
}
USERMODULEDEFS(CDCCMod, "This module allows you to transfer files to and from ZNC")