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Copy pathftpcontrolconnection.cpp
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743 lines (673 loc) · 17.1 KB
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#include "ftpcontrolconnection.h"
#include "ftplistcommand.h"
#include "ftpretrcommand.h"
#include "ftpstorcommand.h"
#include "sslserver.h"
#include "dataconnection.h"
#include <QFileInfo>
#include <QDateTime>
#include <QDir>
#include <QStringList>
#include <QDir>
#include <QEventLoop>
#include <QDebug>
#include <QTimer>
#include <QSslSocket>
#include <QTextCodec>
FtpControlConnection::FtpControlConnection(QObject *parent, QSslSocket *socket, const QString &rootPath, const QString &userName, const QString &password, bool readOnly) :
QObject(parent)
{
this->m_socket = socket;
this->m_userName = userName;
this->m_password = password;
this->m_rootPath = rootPath;
this->m_readOnly = readOnly;
m_isLoggedIn = false;
m_encryptDataConnection = false;
socket->setParent(this);
connect(socket, SIGNAL(readyRead()), this, SLOT(acceptNewData()));
connect(socket, SIGNAL(disconnected()), this, SLOT(deleteLater())); // socket disconnected后析构FtpControlConnection
connect(socket, &QSslSocket::disconnected, [this, socket]() {
emit connectionClosed(socket->peerAddress().toString());
});
m_currentDirectory = "/";
m_dataConnection = new DataConnection(this);
reply("220 Welcome to FtpServer.");
qDebug() << "FtpControlConnection()";
}
FtpControlConnection::~FtpControlConnection()
{
qDebug() << "~FtpControlConnection()";
}
bool isGBK(unsigned char* data, int len)
{
int i = 0;
while (i < len)
{
if (data[i] <= 0x7f)
{
//编码小于等于127,只有一个字节的编码，兼容ASCII
i++;
continue;
}
else
{
//大于127的使用双字节编码
if (data[i] >= 0x81 &&
data[i] <= 0xfe &&
data[i + 1] >= 0x40 &&
data[i + 1] <= 0xfe &&
data[i + 1] != 0xf7)
{
i += 2;
continue;
}
else
{
return false;
}
}
}
return true;
}
bool is_str_utf8(const char* str)
{
unsigned int nBytes = 0;//UFT8可用1-6个字节编码,ASCII用一个字节
unsigned char chr = *str;
bool bAllAscii = true;
for (unsigned int i = 0; str[i] != '\0'; ++i)
{
chr = *(str + i);
//判断是否ASCII编码,如果不是,说明有可能是UTF8,ASCII用7位编码,最高位标记为0,0xxxxxxx
if (nBytes == 0 && (chr & 0x80) != 0)
{
bAllAscii = false;
}
if (nBytes == 0)
{
//如果不是ASCII码,应该是多字节符,计算字节数
if (chr >= 0x80)
{
if (chr >= 0xFC && chr <= 0xFD)
{
nBytes = 6;
}
else if (chr >= 0xF8)
{
nBytes = 5;
}
else if (chr >= 0xF0)
{
nBytes = 4;
}
else if (chr >= 0xE0)
{
nBytes = 3;
}
else if (chr >= 0xC0)
{
nBytes = 2;
}
else
{
return false;
}
nBytes--;
}
}
else
{
//多字节符的非首字节,应为 10xxxxxx
if ((chr & 0xC0) != 0x80)
{
return false;
}
//减到为零为止
nBytes--;
}
}
//违返UTF8编码规则
if (nBytes != 0)
{
return false;
}
if (bAllAscii)
{ //如果全部都是ASCII, 也是UTF8
return true;
}
return true;
}
bool is_str_gbk(const char* str)
{
unsigned int nBytes = 0;//GBK可用1-2个字节编码,中文两个 ,英文一个
unsigned char chr = *str;
bool bAllAscii = true; //如果全部都是ASCII,
for (unsigned int i = 0; str[i] != '\0'; ++i)
{
chr = *(str + i);
if ((chr & 0x80) != 0 && nBytes == 0)
{// 判断是否ASCII编码,如果不是,说明有可能是GBK
bAllAscii = false;
}
if (nBytes == 0)
{
if (chr >= 0x80)
{
if (chr >= 0x81 && chr <= 0xFE)
{
nBytes = +2;
}
else
{
return false;
}
nBytes--;
}
}
else
{
if (chr < 0x40 || chr>0xFE)
{
return false;
}
nBytes--;
}//else end
}
if (nBytes != 0)
{ //违返规则
return false;
}
if (bAllAscii)
{ //如果全部都是ASCII, 也是GBK
return true;
}
return true;
}
void FtpControlConnection::acceptNewData()
{
if (!m_socket->canReadLine())
{
return;
}
// Note how we execute only one line, and use QTimer::singleShot, instead
// of using a for-loop until no more lines are available. This is done
// so we don't block the event loop for a long time.
QByteArray ba = m_socket->readLine().trimmed();
//qDebug() << "socket read: " << ba;
//qDebug() << "from local8bit: " << QString::fromLocal8Bit(ba);
QTextCodec::ConverterState state;
QTextCodec *codec = QTextCodec::codecForName("UTF-8");
QString text = codec->toUnicode(ba.constData(), ba.size(), &state);
if (state.invalidChars > 0)
{
qDebug() << "It is gbk";
processCommand(QString::fromLocal8Bit(ba));
}
else
{
//qDebug() << "It is Utf8";
processCommand(text);
}
QTimer::singleShot(0, this, SLOT(acceptNewData()));
}
void FtpControlConnection::disconnectFromHost()
{
m_socket->disconnectFromHost();
}
bool FtpControlConnection::verifyAuthentication(const QString &command)
{
if (m_isLoggedIn)
{
return true;
}
// cmd ftp在登录之前就会发送OPTS UTF8 ON命令，所以注释掉，避免cmd使用gbk编码导致中文乱码
const char *commandsRequiringAuth[] =
{
"PWD", "CWD", "TYPE", "PORT", "PASV", "LIST", "RETR", "REST",
"NLST", "SIZE", "SYST", "PROT", "CDUP", /*"OPTS",*/ "PBSZ", "NOOP",
"STOR", "MKD", "RMD", "DELE", "RNFR", "RNTO", "APPE",
"XPWD"
};
for (size_t ii = 0; ii < sizeof(commandsRequiringAuth)/sizeof(commandsRequiringAuth[0]); ++ii)
{
if (command == commandsRequiringAuth[ii])
{
reply("530 You must log in first.");
return false;
}
}
return true;
}
bool FtpControlConnection::verifyWritePermission(const QString &command)
{
if (!m_readOnly)
{
return true;
}
const char *commandsRequiringWritePermission[] =
{
"STOR", "MKD", "RMD", "DELE", "RNFR", "RNTO", "APPE"
};
for (size_t ii = 0; ii < sizeof(commandsRequiringWritePermission)/sizeof(commandsRequiringWritePermission[0]); ++ii)
{
if (command == commandsRequiringWritePermission[ii])
{
reply("550 Can't do that in read-only mode.");
return false;
}
}
return true;
}
QString FtpControlConnection::stripFlagL(const QString &fileName)
{
QString a = fileName.toUpper();
if (a == "-L")
{
return "";
}
if (a.startsWith("-L "))
{
return fileName.mid(3);
}
return fileName;
}
void FtpControlConnection::parseCommand(const QString &entireCommand, QString *command, QString *commandParameters)
{
// Split parameters and command.
int pos = entireCommand.indexOf(' ');
if (-1 != pos)
{
*command = entireCommand.left(pos).trimmed().toUpper();
*commandParameters = entireCommand.mid(pos+1).trimmed();
} else
{
*command = entireCommand.trimmed().toUpper();
}
}
QString FtpControlConnection::toLocalPath(const QString &fileName) const
{
QString localPath = fileName;
// Some FTP clients send backslashes.
localPath.replace('\\', '/');
// If this is a relative path, we prepend the current directory.
if (!localPath.startsWith('/'))
{
localPath = m_currentDirectory + '/' + localPath;
}
// Evaluate all the ".." and ".", "/path/././to/dir/../.." becomes "/path".
// Note we do this **before** prepending the root path, in order to avoid
// "jailbreaking" out of the "chroot".
QStringList components;
foreach (const QString &component, localPath.split('/', QString::SkipEmptyParts))
{
if (component == "..")
{
if (!components.isEmpty())
{
components.pop_back();
}
}
else if (component != ".")
{
components += component;
}
}
// Prepend the root path.
localPath = QDir::cleanPath(m_rootPath + '/' + components.join("/"));
qDebug() << "to local path" << fileName << "->" << localPath;
return localPath;
}
void FtpControlConnection::reply(const QString &replyCode)
{
qDebug() << "reply" << replyCode;
m_socket->write((replyCode + "\r\n").toUtf8());
}
void FtpControlConnection::processCommand(const QString &entireCommand)
{
if (!entireCommand.contains("PASS"))
{
qDebug() << "command" << entireCommand;
}
else
{
qDebug() << "command \"PASS XXX\"";
}
QString command;
QString commandParameters;
parseCommand(entireCommand, &command, &commandParameters);
if (!verifyAuthentication(command))
{
return;
}
if (!verifyWritePermission(command))
{
return;
}
if ("USER" == command)
{
reply("331 User name OK, need password.");
}
else if ("PASS" == command)
{
pass(commandParameters);
}
else if ("QUIT" == command)
{
quit();
}
else if ("AUTH" == command && "TLS" == commandParameters.toUpper())
{
auth();
}
else if ("FEAT" == command)
{
feat();
}
else if ("PWD" == command || "XPWD" == command)
{
reply(QString("257 \"%1\"").arg(m_currentDirectory));
}
else if ("CWD" == command)
{
cwd(commandParameters);
}
else if ("TYPE" == command)
{
reply("200 Command okay.");
}
else if ("PORT" == command)
{
port(commandParameters);
}
else if ("PASV" == command)
{
pasv();
}
else if ("LIST" == command)
{
list(toLocalPath(stripFlagL(commandParameters)), false);
}
else if ("RETR" == command)
{
retr(toLocalPath(commandParameters));
}
else if ("REST" == command)
{
reply("350 Requested file action pending further information.");
}
else if ("NLST" == command)
{
list(toLocalPath(stripFlagL(commandParameters)), true);
}
else if ("SIZE" == command)
{
size(toLocalPath(commandParameters));
}
else if ("SYST" == command)
{
reply("215 Windows");
}
else if ("PROT" == command)
{
prot(commandParameters.toUpper());
}
else if ("CDUP" == command)
{
cdup();
}
else if ("OPTS" == command && "UTF8 ON" == commandParameters.toUpper())
{
reply("200 Command okay.");
}
else if ("PBSZ" == command && "0" == commandParameters.toUpper())
{
reply("200 Command okay.");
}
else if ("NOOP" == command)
{
reply("200 Command okay.");
}
else if ("STOR" == command)
{
stor(toLocalPath(commandParameters));
}
else if ("MKD" == command)
{
mkd(toLocalPath(commandParameters));
}
else if ("RMD" == command)
{
rmd(toLocalPath(commandParameters));
}
else if ("DELE" == command)
{
dele(toLocalPath(commandParameters));
}
else if ("RNFR" == command)
{
reply("350 Requested file action pending further information.");
}
else if ("RNTO" == command)
{
rnto(toLocalPath(commandParameters));
}
else if ("APPE" == command)
{
stor(toLocalPath(commandParameters), true);
}
else
{
reply("502 Command not implemented.");
}
m_lastProcessedCommand = entireCommand;
}
void FtpControlConnection::startOrScheduleCommand(FtpCommand *ftpCommand)
{
connect(ftpCommand, SIGNAL(reply(QString)), this, SLOT(reply(QString)));
if (!m_dataConnection->setFtpCommand(ftpCommand))
{
delete ftpCommand;
reply("425 Can't open data connection.");
return;
}
}
void FtpControlConnection::port(const QString &addressAndPort)
{
// Example PORT command:
// PORT h1,h2,h3,h4,p1,p2
// Get IP and port.
QRegExp exp("\\s*(\\d+,\\d+,\\d+,\\d+),(\\d+),(\\d+)");
exp.indexIn(addressAndPort);
QString hostName = exp.cap(1).replace(',', '.');
int port = exp.cap(2).toInt() * 256 + exp.cap(3).toInt();
m_dataConnection->scheduleConnectToHost(hostName, port, m_encryptDataConnection);
reply("200 Command okay.");
}
void FtpControlConnection::pasv()
{
int port = m_dataConnection->listen(m_encryptDataConnection);
reply(QString("227 Entering Passive Mode (%1,%2,%3).").arg(m_socket->localAddress().toString().replace('.',',')).arg(port/256).arg(port%256));
}
void FtpControlConnection::list(const QString &dir, bool nameListOnly)
{
startOrScheduleCommand(new FtpListCommand(this, dir, nameListOnly));
}
void FtpControlConnection::retr(const QString &fileName)
{
startOrScheduleCommand(new FtpRetrCommand(this, fileName, seekTo()));
}
void FtpControlConnection::stor(const QString &fileName, bool appendMode)
{
startOrScheduleCommand(new FtpStorCommand(this, fileName, appendMode, seekTo()));
}
void FtpControlConnection::cwd(const QString &dir)
{
QFileInfo fi(toLocalPath(dir));
if (fi.exists() && fi.isDir())
{
QFileInfo fi(dir);
if (fi.isAbsolute())
{
m_currentDirectory = QDir::cleanPath(dir);
} else
{
m_currentDirectory = QDir::cleanPath(m_currentDirectory + '/' + dir);
}
reply("250 Requested file action okay, completed.");
}
else
{
if (!fi.isDir())
{
qWarning() << QStringLiteral("%1不是目录，cwd不执行").arg(dir);
reply("550 CWD failed. directory not found.");
}
else
{
reply("550 Requested action not taken; file unavailable.");
}
}
//if (!fi.exists())
//{
// reply("550 Requested action not taken; file unavailable.");
// return;
//}
//if (!fi.isDir())
//{
// reply("550 Requested action not taken; file unavailable.");
//}
}
void FtpControlConnection::mkd(const QString &dir)
{
if (QDir().mkdir(dir)) {
reply(QString("257 \"%1\" created.").arg(dir));
} else {
reply("550 Requested action not taken; file unavailable.");
}
}
void FtpControlConnection::rmd(const QString &dir)
{
if (QDir().rmdir(dir)) {
reply("250 Requested file action okay, completed.");
} else {
reply("550 Requested action not taken; file unavailable.");
}
}
void FtpControlConnection::dele(const QString &fileName)
{
if (QDir().remove(fileName)) {
reply("250 Requested file action okay, completed.");
} else {
reply("550 Requested action not taken; file unavailable.");
}
}
void FtpControlConnection::rnto(const QString &fileName)
{
QString command;
QString commandParameters;
parseCommand(m_lastProcessedCommand, &command, &commandParameters);
if ("RNFR" == command && QDir().rename(toLocalPath(commandParameters), fileName))
{
reply("250 Requested file action okay, completed.");
} else
{
reply("550 Requested action not taken; file unavailable.");
}
}
void FtpControlConnection::quit()
{
reply("221 Quitting...");
// If we have a running download or upload, we will wait until it's
// finished before closing the control connection.
if (m_dataConnection->ftpCommand())
{
connect(m_dataConnection->ftpCommand(), SIGNAL(destroyed()), this, SLOT(disconnectFromHost()));
} else
{
disconnectFromHost();
}
}
void FtpControlConnection::size(const QString &fileName)
{
QFileInfo fi(fileName);
if (!fi.exists() || fi.isDir())
{
reply("550 Requested action not taken; file unavailable.");
}
else
{
reply(QString("213 %1").arg(fi.size()));
}
}
void FtpControlConnection::pass(const QString &password)
{
QString command;
QString commandParameters;
parseCommand(m_lastProcessedCommand, &command, &commandParameters);
if (this->m_password.isEmpty() || ("USER" == command && this->m_userName == commandParameters && this->m_password == password))
{
reply("230 You are logged in.");
m_isLoggedIn = true;
}
else
{
reply("530 User name or password was incorrect.");
}
}
void FtpControlConnection::auth()
{
reply("234 Initializing SSL connection.");
SslServer::setLocalCertificateAndPrivateKey(m_socket);
m_socket->startServerEncryption();
}
void FtpControlConnection::prot(const QString &protectionLevel)
{
if ("C" == protectionLevel)
{
m_encryptDataConnection = false;
}
else if ("P" == protectionLevel)
{
m_encryptDataConnection = true;
}
else
{
reply("502 Command not implemented.");
return;
}
reply("200 Command okay.");
}
void FtpControlConnection::cdup()
{
if ("/" == m_currentDirectory)
{
reply("250 Requested file action okay, completed.");
}
else
{
cwd("..");
}
}
void FtpControlConnection::feat()
{
// We only report that we support UTF8 file names, this is needed because
// some clients will assume that we use ASCII otherwise, and will not
// encode the filenames properly.
m_socket->write(
"211-Features:\r\n"
" UTF8\r\n"
"211 End\r\n"
);
}
qint64 FtpControlConnection::seekTo()
{
qint64 seekTo = 0;
QString command;
QString commandParameters;
parseCommand(m_lastProcessedCommand, &command, &commandParameters);
if ("REST" == command)
{
QTextStream(commandParameters.toUtf8()) >> seekTo;
}
return seekTo;
}
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