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aria2/src/FtpConnection.cc

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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "FtpConnection.h"
#include <array>
#include <cstring>
#include <cstdio>
#include <cassert>
#include "Request.h"
#include "Segment.h"
#include "Option.h"
#include "util.h"
#include "message.h"
#include "prefs.h"
#include "LogFactory.h"
#include "Logger.h"
#include "AuthConfigFactory.h"
#include "AuthConfig.h"
#include "DlRetryEx.h"
#include "DlAbortEx.h"
#include "SocketCore.h"
#include "A2STR.h"
#include "fmt.h"
#include "AuthConfig.h"
#include "a2functional.h"
#include "util.h"
#include "error_code.h"
namespace aria2 {
FtpConnection::FtpConnection(cuid_t cuid,
const std::shared_ptr<SocketCore>& socket,
const std::shared_ptr<Request>& req,
const std::shared_ptr<AuthConfig>& authConfig,
const Option* op)
: cuid_(cuid),
socket_(socket),
req_(req),
authConfig_(authConfig),
option_(op),
socketBuffer_(socket),
baseWorkingDir_("/")
{
}
FtpConnection::~FtpConnection() {}
bool FtpConnection::sendUser()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request = "USER ";
request += authConfig_->getUser();
request += "\r\n";
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, "USER ********"));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendPass()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request = "PASS ";
request += authConfig_->getPassword();
request += "\r\n";
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, "PASS ********"));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendType()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request = "TYPE ";
request += (option_->get(PREF_FTP_TYPE) == V_ASCII ? 'A' : 'I');
request += "\r\n";
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendPwd()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request = "PWD\r\n";
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendCwd(const std::string& dir)
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request = "CWD ";
request += util::percentDecode(dir.begin(), dir.end());
request += "\r\n";
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendMdtm()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request = "MDTM ";
request +=
util::percentDecode(req_->getFile().begin(), req_->getFile().end());
request += "\r\n";
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendSize()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request = "SIZE ";
request +=
util::percentDecode(req_->getFile().begin(), req_->getFile().end());
request += "\r\n";
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendEpsv()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request("EPSV\r\n");
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendPasv()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request("PASV\r\n");
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
std::shared_ptr<SocketCore> FtpConnection::createServerSocket()
{
auto endpoint = socket_->getAddrInfo();
auto serverSocket = std::make_shared<SocketCore>();
serverSocket->bind(endpoint.addr.c_str(), 0, AF_UNSPEC);
serverSocket->beginListen();
return serverSocket;
}
bool FtpConnection::sendEprt(const std::shared_ptr<SocketCore>& serverSocket)
{
if (socketBuffer_.sendBufferIsEmpty()) {
auto endpoint = serverSocket->getAddrInfo();
auto request =
fmt("EPRT |%d|%s|%u|\r\n", endpoint.family == AF_INET ? 1 : 2,
endpoint.addr.c_str(), endpoint.port);
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendPort(const std::shared_ptr<SocketCore>& serverSocket)
{
if (socketBuffer_.sendBufferIsEmpty()) {
auto endpoint = socket_->getAddrInfo();
int ipaddr[4];
sscanf(endpoint.addr.c_str(), "%d.%d.%d.%d", &ipaddr[0], &ipaddr[1],
&ipaddr[2], &ipaddr[3]);
auto svEndpoint = serverSocket->getAddrInfo();
auto request =
fmt("PORT %d,%d,%d,%d,%d,%d\r\n", ipaddr[0], ipaddr[1], ipaddr[2],
ipaddr[3], svEndpoint.port / 256, svEndpoint.port % 256);
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendRest(const std::shared_ptr<Segment>& segment)
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request =
fmt("REST %" PRId64 "\r\n", segment ? segment->getPositionToWrite()
: static_cast<int64_t>(0LL));
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
bool FtpConnection::sendRetr()
{
if (socketBuffer_.sendBufferIsEmpty()) {
std::string request = "RETR ";
request +=
util::percentDecode(req_->getFile().begin(), req_->getFile().end());
request += "\r\n";
A2_LOG_INFO(fmt(MSG_SENDING_REQUEST, cuid_, request.c_str()));
socketBuffer_.pushStr(std::move(request));
}
socketBuffer_.send();
return socketBuffer_.sendBufferIsEmpty();
}
int FtpConnection::getStatus(const std::string& response) const
{
int status;
// When the response is not like "%d %*s",
// we return 0.
if (response.find_first_not_of("0123456789") != 3 ||
!(response.find(" ") == 3 || response.find("-") == 3)) {
return 0;
}
if (sscanf(response.c_str(), "%d %*s", &status) == 1) {
return status;
}
else {
return 0;
}
}
// Returns the length of the response if the whole response has been received.
// The length includes \r\n.
// If the whole response has not been received, then returns std::string::npos.
std::string::size_type
FtpConnection::findEndOfResponse(int status, const std::string& buf) const
{
if (buf.size() <= 4) {
return std::string::npos;
}
// if 4th character of buf is '-', then multi line response is expected.
if (buf.at(3) == '-') {
// multi line response
std::string::size_type p;
p = buf.find(fmt("\r\n%d ", status));
if (p == std::string::npos) {
return std::string::npos;
}
p = buf.find("\r\n", p + 6);
if (p == std::string::npos) {
return std::string::npos;
}
else {
return p + 2;
}
}
else {
// single line response
std::string::size_type p = buf.find("\r\n");
if (p == std::string::npos) {
return std::string::npos;
}
else {
return p + 2;
}
}
}
bool FtpConnection::bulkReceiveResponse(std::pair<int, std::string>& response)
{
std::array<char, 1_k> buf;
while (1) {
size_t size = buf.size();
socket_->readData(buf.data(), size);
if (size == 0) {
if (socket_->wantRead() || socket_->wantWrite()) {
break;
}
else {
throw DL_RETRY_EX(EX_GOT_EOF);
}
}
if (strbuf_.size() + size > MAX_RECV_BUFFER) {
throw DL_RETRY_EX(fmt("Max FTP recv buffer reached. length=%lu",
static_cast<unsigned long>(strbuf_.size() + size)));
}
strbuf_.append(std::begin(buf), std::begin(buf) + size);
}
int status;
if (strbuf_.size() >= 4) {
status = getStatus(strbuf_);
if (status == 0) {
throw DL_ABORT_EX2(EX_INVALID_RESPONSE, error_code::FTP_PROTOCOL_ERROR);
}
}
else {
return false;
}
std::string::size_type length;
if ((length = findEndOfResponse(status, strbuf_)) != std::string::npos) {
response.first = status;
response.second.assign(strbuf_.begin(), strbuf_.begin() + length);
A2_LOG_INFO(fmt(MSG_RECEIVE_RESPONSE, cuid_, response.second.c_str()));
strbuf_.erase(0, length);
return true;
}
else {
// didn't receive response fully.
return false;
}
}
int FtpConnection::receiveResponse()
{
std::pair<int, std::string> response;
if (bulkReceiveResponse(response)) {
return response.first;
}
else {
return 0;
}
}
#ifdef __MINGW32__
#define LONGLONG_PRINTF "%I64d"
#define ULONGLONG_PRINTF "%I64u"
#define LONGLONG_SCANF "%I64d"
#define ULONGLONG_SCANF "%I64u"
#else
#define LONGLONG_PRINTF "%" PRId64 ""
#define ULONGLONG_PRINTF "%llu"
#define LONGLONG_SCANF "%Ld"
// Mac OSX uses "%llu" for 64bits integer.
#define ULONGLONG_SCANF "%Lu"
#endif // __MINGW32__
int FtpConnection::receiveSizeResponse(int64_t& size)
{
std::pair<int, std::string> response;
if (bulkReceiveResponse(response)) {
if (response.first == 213) {
auto rp = util::divide(std::begin(response.second),
std::end(response.second), ' ');
if (!util::parseLLIntNoThrow(
size, std::string(rp.second.first, rp.second.second)) ||
size < 0) {
throw DL_ABORT_EX("Size must be positive integer");
}
}
return response.first;
}
else {
return 0;
}
}
namespace {
template <typename T>
bool getInteger(T* dest, const char* first, const char* last)
{
int res = 0;
// We assume *dest won't overflow.
for (; first != last; ++first) {
if (util::isDigit(*first)) {
res *= 10;
res += (*first) - '0';
}
else {
return false;
}
}
*dest = res;
return true;
}
} // namespace
int FtpConnection::receiveMdtmResponse(Time& time)
{
// MDTM command, specified in RFC3659.
std::pair<int, std::string> response;
if (bulkReceiveResponse(response)) {
if (response.first == 213) {
char buf[15]; // YYYYMMDDhhmmss+\0, milli second part is dropped.
sscanf(response.second.c_str(), "%*u %14s", buf);
if (strlen(buf) == 14) {
// We don't use Time::parse(buf,"%Y%m%d%H%M%S") here because Mac OS X
// and included strptime doesn't parse data for this format.
struct tm tm;
memset(&tm, 0, sizeof(tm));
if (getInteger(&tm.tm_sec, &buf[12], &buf[14]) &&
getInteger(&tm.tm_min, &buf[10], &buf[12]) &&
getInteger(&tm.tm_hour, &buf[8], &buf[10]) &&
getInteger(&tm.tm_mday, &buf[6], &buf[8]) &&
getInteger(&tm.tm_mon, &buf[4], &buf[6]) &&
getInteger(&tm.tm_year, &buf[0], &buf[4])) {
tm.tm_mon -= 1;
tm.tm_year -= 1900;
time = Time(timegm(&tm));
}
else {
time = Time::null();
}
}
else {
time = Time::null();
}
}
return response.first;
}
else {
return 0;
}
}
int FtpConnection::receiveEpsvResponse(uint16_t& port)
{
std::pair<int, std::string> response;
if (bulkReceiveResponse(response)) {
if (response.first == 229) {
port = 0;
std::string::size_type leftParen = response.second.find("(");
std::string::size_type rightParen = response.second.find(")");
if (leftParen == std::string::npos || rightParen == std::string::npos ||
leftParen > rightParen) {
return response.first;
}
std::vector<Scip> rd;
util::splitIter(response.second.begin() + leftParen + 1,
response.second.begin() + rightParen,
std::back_inserter(rd), '|', true, true);
uint32_t portTemp = 0;
if (rd.size() == 5 &&
util::parseUIntNoThrow(portTemp,
std::string(rd[3].first, rd[3].second))) {
if (0 < portTemp && portTemp <= UINT16_MAX) {
port = portTemp;
}
}
}
return response.first;
}
else {
return 0;
}
}
int FtpConnection::receivePasvResponse(std::pair<std::string, uint16_t>& dest)
{
std::pair<int, std::string> response;
if (bulkReceiveResponse(response)) {
if (response.first == 227) {
// we assume the format of response is "227 Entering Passive
// Mode (h1,h2,h3,h4,p1,p2)."
int h1, h2, h3, h4, p1, p2;
std::string::size_type p = response.second.find("(");
if (p >= 4) {
sscanf(response.second.c_str() + p, "(%d,%d,%d,%d,%d,%d).", &h1, &h2,
&h3, &h4, &p1, &p2);
// ip address
dest.first = fmt("%d.%d.%d.%d", h1, h2, h3, h4);
// port number
dest.second = 256 * p1 + p2;
}
else {
throw DL_RETRY_EX(EX_INVALID_RESPONSE);
}
}
return response.first;
}
else {
return 0;
}
}
int FtpConnection::receivePwdResponse(std::string& pwd)
{
std::pair<int, std::string> response;
if (bulkReceiveResponse(response)) {
if (response.first == 257) {
std::string::size_type first;
std::string::size_type last;
if ((first = response.second.find("\"")) != std::string::npos &&
(last = response.second.find("\"", ++first)) != std::string::npos) {
pwd.assign(response.second.begin() + first,
response.second.begin() + last);
}
else {
throw DL_ABORT_EX2(EX_INVALID_RESPONSE, error_code::FTP_PROTOCOL_ERROR);
}
}
return response.first;
}
else {
return 0;
}
}
void FtpConnection::setBaseWorkingDir(const std::string& baseWorkingDir)
{
baseWorkingDir_ = baseWorkingDir;
}
const std::string& FtpConnection::getUser() const
{
return authConfig_->getUser();
}
} // namespace aria2
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