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FTPServer.cpp
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FTPServer.cpp
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/*
* FTP Server for ESP8266/ESP32
* based on FTP Serveur for Arduino Due and Ethernet shield (W5100) or WIZ820io (W5200)
* based on Jean-Michel Gallego's work
* modified to work with esp8266 SPIFFS by David Paiva david@nailbuster.com
* modified to work with esp8266 LitteFS by Daniel Plasa dplasa@gmail.com
* Also done some code reworks and all string contants are now in flash memory
* by using F(), PSTR() ... on the string literals.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "FTPServer.h"
#ifdef ESP8266
#include <ESP8266WiFi.h>
#elif defined ESP32
#include <WiFi.h>
#endif
#include "FTPCommon.h"
#include <stdlib.h>
#include <stdarg.h>
WiFiServer controlServer(FTP_CTRL_PORT);
WiFiServer dataServer(FTP_DATA_PORT_PASV);
// some constants
static const char aSpace[] PROGMEM = " ";
static const char aSlash[] PROGMEM = "/";
// constructor
FTPServer::FTPServer(FS &_FSImplementation) : FTPCommon(_FSImplementation)
{
aTimeout.resetToNeverExpires();
}
void FTPServer::begin(const String &uname, const String &pword)
{
_FTP_USER = uname;
_FTP_PASS = pword;
iniVariables();
// Tells the ftp server to begin listening for incoming connections
controlServer.begin();
dataServer.begin();
}
void FTPServer::stop()
{
abortTransfer();
disconnectClient(false);
controlServer.stop();
dataServer.stop();
FTPCommon::stop();
}
void FTPServer::iniVariables()
{
// Default Data connection is Active
dataPassiveConn = true;
// Set the root directory
cwd = FPSTR(aSlash);
// init internal status vars
cmdState = cInit;
transferState = tIdle;
rnFrom.clear();
// reset control connection input buffer, clear previous command
cmdLine.clear();
cmdString.clear();
parameters.clear();
command = 0;
// free any used fileBuffer
freeBuffer();
}
void FTPServer::handleFTP()
{
//
// control connection state sequence is
// cInit
// |
// V
// cWait
// |
// V
// cCheck -----------+
// | | (no username but password set)
// V |
// cUserId ----------+---+
// | | |
// +<--------------+ |
// V | (no password set)
// cPassword |
// | |
// +<------------------+
// V
// cLoginOk
// |
// V
// cProcess
//
if (cmdState == cInit)
{
if (control.connected())
{
abortTransfer();
disconnectClient(false);
}
iniVariables();
cmdState = cWait;
}
else if (cmdState == cWait) // FTP control server waiting for connection
{
if (controlServer.hasClient())
{
control = controlServer.available();
// wait 10s for login command
aTimeout.reset(10 * 1000);
cmdState = cCheck;
}
}
else if (cmdState == cCheck) // FTP control server check/setup control connection
{
if (control.connected()) // A client connected, say "220 Hello client!"
{
FTP_DEBUG_MSG("control server got connection from %s:%d",
control.remoteIP().toString().c_str(), control.remotePort());
sendMessage_P(220, PSTR("(espFTP " FTP_SERVER_VERSION ")"));
if (_FTP_USER.length())
{
cmdState = cUserId;
}
else if (_FTP_PASS.length())
{
cmdState = cPassword;
}
else
{
cmdState = cLoginOk;
}
}
}
else if (cmdState == cLoginOk) // tell client "Login ok!"
{
sendMessage_P(230, PSTR("Login successful."));
aTimeout.reset(sTimeOutMs);
cmdState = cProcess;
}
//
// all other command states need to process commands froms control connection
//
else if (readChar() > 0)
{
// enforce USER than PASS commands before anything else except the FEAT command
// that should be supported to indicate server features even before login
if ((FTP_CMD(FEAT) != command) && (((cmdState == cUserId) && (FTP_CMD(USER) != command)) ||
((cmdState == cPassword) && (FTP_CMD(PASS) != command))))
{
sendMessage_P(530, PSTR("Please login with USER and PASS."));
FTP_DEBUG_MSG("ignoring before login: command %s [%x], params='%s'", cmdString.c_str(), command, parameters.c_str());
command = 0;
return;
}
// process the command
int8_t rc = processCommand();
// returns
// -1 : command processing indicates, we have to close control (e.g. QUIT)
// 0 : not yet finished, just call processCommend() again
// 1 : finished
if (rc < 0)
{
cmdState = cInit;
}
if (rc > 0)
{
// clear current command, so readChar() can fetch the next command
command = 0;
// command was successful, update command state
if (cmdState == cUserId)
{
if (_FTP_PASS.length())
{
// wait 10s for PASS command
aTimeout.reset(10 * 1000);
sendMessage_P(331, PSTR("Please specify the password."));
cmdState = cPassword;
}
else
{
cmdState = cLoginOk;
}
}
else if (cmdState == cPassword)
{
cmdState = cLoginOk;
}
else
{
aTimeout.reset(sTimeOutMs);
}
}
}
//
// general connection handling
// (if we have an established control connection)
//
if (cmdState >= cCheck)
{
// detect lost/closed by remote connections
if (!control.connected() || !control)
{
cmdState = cInit;
FTP_DEBUG_MSG("client lost or disconnected");
}
// check for timeout
if (aTimeout.expired())
{
sendMessage_P(530, PSTR("Timeout."));
cmdState = cInit;
}
// handle data file transfer
if (transferState == tRetrieve) // Retrieve data
{
if (!doFiletoNetwork())
{
closeTransfer();
transferState = tIdle;
}
}
else if (transferState == tStore) // Store data
{
if (!doNetworkToFile())
{
closeTransfer();
transferState = tIdle;
}
}
}
}
void FTPServer::disconnectClient(bool gracious)
{
FTP_DEBUG_MSG("Disconnecting client");
abortTransfer();
if (gracious)
{
sendMessage_P(221, PSTR("Goodbye."));
}
else
{
sendMessage_P(231, PSTR("Service terminated."));
}
control.stop();
}
int8_t FTPServer::processCommand()
{
// assume successful operation by default
int8_t rc = 1;
// make the full path of parameters (even if this makes no sense for all commands)
String path = getFileName(parameters, true);
FTP_DEBUG_MSG("processing: command %s [%x], params='%s' (cwd='%s')", cmdString.c_str(), command, parameters.c_str(), cwd.c_str());
///////////////////////////////////////
// //
// ACCESS CONTROL COMMANDS //
// //
///////////////////////////////////////
//
// USER - Provide username
//
if (FTP_CMD(USER) == command)
{
if (_FTP_USER.length() && (_FTP_USER != parameters))
{
sendMessage_P(430, PSTR("User not found."));
command = 0;
rc = 0;
}
else
{
FTP_DEBUG_MSG("USER ok");
}
}
//
// PASS - Provide password
//
else if (FTP_CMD(PASS) == command)
{
if (_FTP_PASS.length() && (_FTP_PASS != parameters))
{
sendMessage_P(430, PSTR("Password invalid."));
command = 0;
rc = 0;
}
else
{
FTP_DEBUG_MSG("PASS ok");
}
}
//
// QUIT
//
else if (FTP_CMD(QUIT) == command)
{
disconnectClient();
rc = -1;
}
//
// NOOP
//
else if (FTP_CMD(NOOP) == command)
{
sendMessage_P(200, PSTR("Zzz..."));
}
//
// CDUP - Change to Parent Directory
//
else if (FTP_CMD(CDUP) == command)
{
// up one level
cwd = getPathName("", false);
sendMessage_P(250, PSTR("Directory successfully changed to \"%s\"."), cwd.c_str());
}
//
// CWD - Change Working Directory
//
else if (FTP_CMD(CWD) == command)
{
if (parameters == F(".")) // 'CWD .' is the same as PWD command
{
command = FTP_CMD(PWD); // make CWD a PWD command ;-)
rc = 0; // indicate we need another processCommand() call
}
else if (parameters == F("..")) // 'CWD ..' is the same as CDUP command
{
command = FTP_CMD(CDUP); // make CWD a CDUP command ;-)
rc = 0; // indicate we need another processCommand() call
}
else
{
#if (defined esp8266FTPServer_SPIFFS)
// SPIFFS has no directories, it's always ok
cwd = path;
sendMessage_P(250, PSTR("Directory successfully changed."));
#else
// check if directory exists
file = THEFS.open(path, "r");
if (file.isDirectory())
{
cwd = path;
sendMessage_P(250, PSTR("Directory successfully changed."));
}
else
{
sendMessage_P(550, PSTR("Failed to change directory."));
}
file.close();
#endif
}
}
//
// PWD - Print Directory
//
else if (FTP_CMD(PWD) == command)
{
sendMessage_P(257, PSTR("\"%s\" is the current directory."), cwd.c_str());
}
///////////////////////////////////////
// //
// TRANSFER PARAMETER COMMANDS //
// //
///////////////////////////////////////
//
// MODE - Transfer Mode
//
else if (FTP_CMD(MODE) == command)
{
if (parameters == F("S"))
sendMessage_P(504, PSTR("Only S(tream) mode is suported"));
else
sendMessage_P(200, PSTR("Mode set to S."));
}
//
// PASV - Passive data connection management
//
else if (FTP_CMD(PASV) == command)
{
// stop a possible previous data connection
data.stop();
// tell client to open data connection to our ip:dataPort
dataPort = FTP_DATA_PORT_PASV;
dataPassiveConn = true;
String ip = control.localIP().toString();
ip.replace(".", ",");
sendMessage_P(227, PSTR("Entering Passive Mode (%s,%d,%d)."), ip.c_str(), dataPort >> 8, dataPort & 255);
//sendMessage_P(227, PSTR("Entering Passive Mode (0,0,0,0,%d,%d)."), dataPort >> 8, dataPort & 255);
}
//
// PORT - Data Port, Active data connection management
//
else if (FTP_CMD(PORT) == command)
{
if (data)
data.stop();
if (parseDataIpPort(parameters.c_str()))
{
dataPassiveConn = false;
sendMessage_P(200, PSTR("PORT command successful"));
FTP_DEBUG_MSG("Data connection management Active, using %s:%u", dataIP.toString().c_str(), dataPort);
}
else
{
sendMessage_P(501, PSTR("Cannot interpret parameters."));
}
}
//
// STRU - File Structure
//
else if (FTP_CMD(STRU) == command)
{
if (parameters == F("F"))
sendMessage_P(504, PSTR("Only F(ile) is suported"));
else
sendMessage_P(200, PSTR("Structure set to F."));
}
//
// TYPE - Data Type
//
else if (FTP_CMD(TYPE) == command)
{
if (parameters == F("A"))
sendMessage_P(200, PSTR("TYPE is now ASII."));
else if (parameters == F("I"))
sendMessage_P(200, PSTR("TYPE is now 8-bit Binary."));
else
sendMessage_P(504, PSTR("Unrecognised TYPE."));
}
///////////////////////////////////////
// //
// FTP SERVICE COMMANDS //
// //
///////////////////////////////////////
//
// ABOR - Abort
//
else if (FTP_CMD(ABOR) == command)
{
abortTransfer();
sendMessage_P(226, PSTR("Data connection closed"));
}
//
// DELE - Delete a File
//
else if (FTP_CMD(DELE) == command)
{
if (parameters.length() == 0)
sendMessage_P(501, PSTR("No file name"));
else
{
if (!THEFS.exists(path))
{
sendMessage_P(550, PSTR("Delete operation failed, file '%s' not found."), path.c_str());
}
else if (THEFS.remove(path))
{
sendMessage_P(250, PSTR("Delete operation successful."));
}
else
{
sendMessage_P(450, PSTR("Delete operation failed."));
}
}
}
//
// LIST - List directory contents
// MLSD - Listing for Machine Processing (see RFC 3659)
// NLST - Name List
//
else if ((FTP_CMD(LIST) == command) || (FTP_CMD(MLSD) == command) || (FTP_CMD(NLST) == command))
{
rc = dataConnect(); // returns -1: no data connection, 0: need more time, 1: data ok
if (rc < 0)
{
sendMessage_P(425, PSTR("No data connection"));
rc = 1; // mark command as processed
}
else if (rc > 0)
{
sendMessage_P(150, PSTR("Accepted data connection"));
uint16_t dirCount = 0;
// filter out possible command parameters like "-a", given by some clients
// like FuseFS
int8_t dashPos = path.lastIndexOf(F("-"));
if (dashPos > 0)
{
path.remove(dashPos);
}
FTP_DEBUG_MSG("Listing content of '%s'", path.c_str());
#if (defined ESP8266)
Dir dir = THEFS.openDir(path);
while (dir.next())
{
file = dir.openFile("r");
#elif (defined ESP32)
File dir = THEFS.open(path);
file = dir.openNextFile();
while (file)
{
#endif
bool isDir = file.isDirectory();
String fn = file.name();
uint32_t fs = file.size();
String fileTime = makeDateTimeStr(file.getLastWrite());
file.close();
dashPos = fn.lastIndexOf(F("/"));
if (dashPos >= 0)
{
fn.remove(0, dashPos + 1);
}
if (FTP_CMD(LIST) == command)
{
// unixperms type userid groupid size time & date name
// drwxrwsr-x 2 111 117 4096 Apr 01 12:45 aDirectory
// -rw-rw-r-- 1 111 117 875315 Mar 23 17:29 aFile
data.printf_P(PSTR("%crw%cr-%cr-%c %c 0 0 %8" PRINTu32 " %s %s\r\n"),
isDir ? 'd' : '-',
isDir ? 'x' : '-',
isDir ? 'x' : '-',
isDir ? 'x' : '-',
isDir ? '2' : '1',
isDir ? 0 : fs,
fileTime.c_str(),
fn.c_str());
//data.printf_P(PSTR("+r,s%lu\r\n,\t%s\r\n"), (uint32_t)dir.fileSize(), fn.c_str());
}
else if (FTP_CMD(MLSD) == command)
{
// "modify=20170122163911;type=dir;UNIX.group=0;UNIX.mode=0775;UNIX.owner=0; dirname"
// "modify=20170121000817;size=12;type=file;UNIX.group=0;UNIX.mode=0644;UNIX.owner=0; filename"
data.printf_P(PSTR("modify=%s;UNIX.group=0;UNIX.owner=0;UNIX.mode="), fileTime.c_str());
if (isDir)
{
data.printf_P(PSTR("0755;type=dir; "));
}
else
{
data.printf_P(PSTR("0644;size=%" PRINTu32 ";type=file; "), fs);
}
data.printf_P(PSTR("%s\r\n"), fn.c_str());
}
else if (FTP_CMD(NLST) == command)
{
data.println(fn);
}
++dirCount;
#if (defined ESP32)
file = dir.openNextFile();
#endif
}
if (FTP_CMD(MLSD) == command)
{
control.println(F("226-options: -a -l\r\n"));
}
sendMessage_P(226, PSTR("%d matches total"), dirCount);
}
data.stop();
}
//
// RETR - Retrieve
//
else if (FTP_CMD(RETR) == command)
{
if (parameters.length() == 0)
{
sendMessage_P(501, PSTR("No file name"));
}
else
{
// open the file if not opened before (when re-running processCommand() since data connetion needs time)
if (!file)
file = THEFS.open(path, "r");
if (!file)
{
sendMessage_P(550, PSTR("File \"%s\" not found."), parameters.c_str());
}
else if (file.isDirectory())
{
sendMessage_P(450, PSTR("Cannot open file \"%s\"."), parameters.c_str());
}
else
{
rc = dataConnect(); // returns -1: no data connection, 0: need more time, 1: data ok
if (rc < 0)
{
sendMessage_P(425, PSTR("No data connection"));
rc = 1; // mark command as processed
}
else if (rc > 0)
{
transferState = tRetrieve;
millisBeginTrans = millis();
bytesTransfered = 0;
uint32_t fs = file.size();
if (allocateBuffer())
{
FTP_DEBUG_MSG("Sending file '%s' (%lu bytes)", path.c_str(), fs);
sendMessage_P(150, PSTR("%lu bytes to download"), fs);
}
else
{
closeTransfer();
sendMessage_P(451, PSTR("Internal error. Not enough memory."));
}
}
}
}
}
//
// STOR - Store
//
else if (FTP_CMD(STOR) == command)
{
if (parameters.length() == 0)
{
sendMessage_P(501, PSTR("No file name."));
}
else
{
FTP_DEBUG_MSG("STOR '%s'", path.c_str());
if (!file)
{
file = THEFS.open(path, "w"); // open file, truncate it if already exists
file.close(); // this performs a sync on LittleFS so that the actual
// space used by the file in FS gets released
file = THEFS.open(path, "w"); // re-open file for writing
}
if (!file)
{
sendMessage_P(451, PSTR("Cannot open/create \"%s\""), path.c_str());
}
else
{
rc = dataConnect(); // returns -1: no data connection, 0: need more time, 1: data ok
if (rc < 0)
{
sendMessage_P(425, PSTR("No data connection"));
file.close();
rc = 1; // mark command as processed
}
else if (rc > 0)
{
transferState = tStore;
millisBeginTrans = millis();
bytesTransfered = 0;
if (allocateBuffer())
{
FTP_DEBUG_MSG("Receiving file '%s' => %s", parameters.c_str(), path.c_str());
sendMessage_P(150, PSTR("Connected to port %d"), dataPort);
}
else
{
closeTransfer();
sendMessage_P(451, PSTR("Internal error. Not enough memory."));
}
}
}
}
}
//
// MKD - Make Directory
//
else if (FTP_CMD(MKD) == command)
{
#if (defined esp8266FTPServer_SPIFFS)
sendMessage_P(550, "Create directory operation failed."); //not support on SPIFFS
#else
FTP_DEBUG_MSG("mkdir(%s)", path.c_str());
if (THEFS.mkdir(path))
{
sendMessage_P(257, PSTR("\"%s\" created."), path.c_str());
}
else
{
sendMessage_P(550, PSTR("Create directory operation failed."));
}
#endif
}
//
// RMD - Remove a Directory
//
else if (FTP_CMD(RMD) == command)
{
#if (defined esp8266FTPServer_SPIFFS)
sendMessage_P(550, "Remove directory operation failed."); //not support on SPIFFS
#else
// check directory for files
#if (defined ESP8266)
Dir dir = THEFS.openDir(path);
if (dir.next())
{
#elif (defined ESP32)
File dir = THEFS.open(path);
file = dir.openNextFile();
if (file)
{
file.close();
#endif
//only delete if dir is empty!
sendMessage_P(550, PSTR("Remove directory operation failed, directory is not empty."));
}
else
{
THEFS.rmdir(path);
sendMessage_P(250, PSTR("Remove directory operation successful."));
}
#endif
}
//
// RNFR - Rename From
//
else if (FTP_CMD(RNFR) == command)
{
if (parameters.length() == 0)
sendMessage_P(501, PSTR("No file name"));
else
{
if (!THEFS.exists(path))
sendMessage_P(550, PSTR("File \"%s\" not found."), path.c_str());
else
{
sendMessage_P(350, PSTR("RNFR accepted - file \"%s\" exists, ready for destination"), path.c_str());
rnFrom = path;
}
}
}
//
// RNTO - Rename To
//
else if (FTP_CMD(RNTO) == command)
{
if (rnFrom.length() == 0)
sendMessage_P(503, PSTR("Need RNFR before RNTO"));
else if (parameters.length() == 0)
sendMessage_P(501, PSTR("No file name"));
else if (THEFS.exists(path))
sendMessage_P(553, PSTR("\"%s\" already exists."), parameters.c_str());
else
{
FTP_DEBUG_MSG("Renaming '%s' to '%s'", rnFrom.c_str(), path.c_str());
if (THEFS.rename(rnFrom, path))
sendMessage_P(250, PSTR("File successfully renamed or moved"));
else
sendMessage_P(451, PSTR("Rename/move failure."));
}
rnFrom.clear();
}
///////////////////////////////////////
// //
// EXTENSIONS COMMANDS (RFC 3659) //
// //
///////////////////////////////////////
//
// FEAT - New Features
//
else if (FTP_CMD(FEAT) == command)
{
control.print(F("211-Features:\r\n MLSD\r\n MDTM\r\n SITE\r\n SIZE\r\n211 End.\r\n"));
command = 0; // clear command code and
rc = 0; // return 0 to prevent progression of state machine in case FEAT was a command before login
}
//
// MDTM - File Modification Time (see RFC 3659)
//
else if (FTP_CMD(MDTM) == command)
{
file = THEFS.open(path, "r");
if ((!file) || (0 == parameters.length()))
{
sendMessage_P(550, PSTR("Unable to retrieve time"));
}
else
{
sendMessage_P(213, PSTR("%s"), makeDateTimeStr(file.getLastWrite()).c_str());
}
file.close();
}
//
// SIZE - Size of the file
//
else if (FTP_CMD(SIZE) == command)
{
file = THEFS.open(path, "r");
if ((!file) || (0 == parameters.length()))
{
sendMessage_P(450, PSTR("Cannot open file."));
}
else
{
sendMessage_P(213, PSTR("%lu"), (uint32_t)file.size());
}
file.close();
}
//
// SITE - System command
//
else if (FTP_CMD(SITE) == command)
{
sendMessage_P(550, PSTR("SITE %s command not implemented."), parameters.c_str());
}
//
// SYST - System information
//
else if (FTP_CMD(SYST) == command)
{
sendMessage_P(215, PSTR("UNIX Type: L8"));
}
//
// Unrecognized commands ...
//
else
{
FTP_DEBUG_MSG("Unknown command: %s, params: '%s')", cmdString.c_str(), parameters.c_str());
sendMessage_P(500, PSTR("unknown command \"%s\""), cmdString.c_str());
}
return rc;
}
int8_t FTPServer::dataConnect()
{
int8_t rc = 1; // assume success
if (!dataPassiveConn)
{
// active mode
// open our own data connection
return FTPCommon::dataConnect();
}
else
{
// passive mode
// wait for data connection from the client
if (!data.connected())
{
if (dataServer.hasClient())
{
data.stop();
data = dataServer.available();
FTP_DEBUG_MSG("Got incoming (passive) data connection from %s:%u", data.remoteIP().toString().c_str(), data.remotePort());
}
else
{
// give me more time waiting for a data connection
rc = 0;
}
}
}
return rc;
}
void FTPServer::closeTransfer()
{
uint32_t deltaT = (int32_t)(millis() - millisBeginTrans);
if (deltaT > 0 && bytesTransfered > 0)
{
sendMessage_P(226, PSTR("File successfully transferred, %lu ms, %f kB/s."), deltaT, float(bytesTransfered) / deltaT);
}
else
sendMessage_P(226, PSTR("File successfully transferred"));
FTPCommon::closeTransfer();
}
void FTPServer::abortTransfer()
{
if (transferState > tIdle)
{
file.close();
data.stop();
sendMessage_P(426, PSTR("Transfer aborted"));
}
freeBuffer();
transferState = tIdle;
}
// Read a char from client connected to ftp server
//
// returns:
// -1 if cmdLine too long
// 0 cmdLine still incomplete (no \r or \n received yet)
// 1 cmdLine processed, command and parameters available
int8_t FTPServer::readChar()
{
// only read/parse, if the previous command has been fully processed!
if (command)
return 1;
while (control.available())
{
char c = control.read();
// FTP_DEBUG_MSG("readChar() cmdLine='%s' <= %c", cmdLine.c_str(), c);
// substitute '\' with '/'
if (c == '\\')
c = '/';
// nl detected? then process line
if (c == '\n' || c == '\r')
{
cmdLine.trim();
// but only if we got at least chars in the line!
if (0 == cmdLine.length())
break;
// search for space between command and parameters
int pos = cmdLine.indexOf(FPSTR(aSpace));
if (pos > 0)
{
parameters = cmdLine.substring(pos + 1);
parameters.trim();
cmdLine.remove(pos);
}
else
{
parameters.remove(0);
}
cmdString = cmdLine;
// convert command to upper case
cmdString.toUpperCase();
// convert the (up to 4 command chars to numerical value)
command = *(const uint32_t *)cmdString.c_str();
// clear cmdline