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PSMTPServer Class Reference

A TCP/IP socket for the Simple Mail Transfer Protocol. More...

#include <inetmail.h>

Inheritance diagram for PSMTPServer:
PSMTP PInternetProtocol PIndirectChannel PChannel PObject

Public Types

enum  ForwardResult { LocalDomain, WillForward, CannotForward }
 
enum  LookUpResult { ValidUser, AmbiguousUser, UnknownUser, LookUpError }
 
- Public Types inherited from PSMTP
enum  Commands {
  HELO, EHLO, QUIT, HELP,
  NOOP, TURN, RSET, VRFY,
  EXPN, RCPT, MAIL, SEND,
  SAML, SOML, DATA, AUTH,
  NumCommands
}
 
- Public Types inherited from PChannel
enum  PXBlockType { PXReadBlock, PXWriteBlock, PXAcceptBlock, PXConnectBlock }
 
enum  ShutdownValue { ShutdownRead = 0, ShutdownWrite = 1, ShutdownReadAndWrite = 2 }
 
enum  Errors {
  NoError, NotFound, FileExists, DiskFull,
  AccessDenied, DeviceInUse, BadParameter, NoMemory,
  NotOpen, Timeout, Interrupted, BufferTooSmall,
  Miscellaneous, ProtocolFailure, NumNormalisedErrors
}
 Normalised error codes. More...
 
enum  ErrorGroup { LastReadError, LastWriteError, LastGeneralError, NumErrorGroups }
 Error groups. More...
 
typedef std::vector< SliceVectorOfSlice
 
- Public Types inherited from PObject
enum  Comparison { LessThan = -1, EqualTo = 0, GreaterThan = 1 }
 Result of the comparison operation performed by the Compare() function. More...
 

Public Member Functions

 PSMTPServer ()
 Create a TCP/IP SMPTP protocol socket channel. More...
 
PBoolean ProcessCommand ()
 Process commands, dispatching to the appropriate virtual function. More...
 
void ServerReset ()
 
virtual ForwardResult ForwardDomain (PCaselessString &userDomain, PCaselessString &forwardDomainList)
 Determine if a user for this domain may be on the local system, or should be forwarded. More...
 
virtual LookUpResult LookUpName (const PCaselessString &name, PString &expandedName)
 Look up a name in the context of the SMTP server. More...
 
virtual PBoolean HandleMessage (PCharArray &buffer, PBoolean starting, PBoolean completed)
 Handle a received message. More...
 
- Public Member Functions inherited from PInternetProtocol
virtual PBoolean Read (void *buf, PINDEX len)
 Low level read from the channel. More...
 
virtual PBoolean Write (const void *buf, PINDEX len)
 Low level write to the channel. More...
 
void SetReadLineTimeout (const PTimeInterval &t)
 Set the maximum timeout between characters within a line. More...
 
virtual PBoolean Connect (const PString &address, WORD port=0)
 Connect a socket to a remote host for the internet protocol. More...
 
virtual PBoolean Connect (const PString &address, const PString &service)
 
virtual PBoolean Accept (PSocket &listener)
 Accept a server socket to a remote host for the internet protocol. More...
 
const PStringGetDefaultService () const
 Get the default service name or port number to use in socket connections. More...
 
PIPSocketGetSocket () const
 Get the eventual socket for the series of indirect channels that may be between the current protocol and the actual I/O channel. More...
 
virtual PBoolean WriteLine (const PString &line)
 Write a string to the socket channel followed by a CR/LF pair. More...
 
virtual PBoolean ReadLine (PString &line, PBoolean allowContinuation=false)
 Read a string from the socket channel up to a CR/LF pair. More...
 
virtual void UnRead (int ch)
 Put back the characters into the data stream so that the next Read() function call will return them first. More...
 
virtual void UnRead (const PString &str)
 
virtual void UnRead (const void *buffer, PINDEX len)
 
virtual PBoolean WriteCommand (PINDEX cmdNumber)
 Write a single line for a command. More...
 
virtual PBoolean WriteCommand (PINDEX cmdNumber, const PString &param)
 
virtual PBoolean ReadCommand (PINDEX &num, PString &args)
 Read a single line of a command which ends with a CR/LF pair. More...
 
virtual PBoolean WriteResponse (unsigned numericCode, const PString &info)
 Write a response code followed by a text string describing the response to a command. More...
 
virtual PBoolean WriteResponse (const PString &code, const PString &info)
 
virtual PBoolean ReadResponse ()
 Read a response code followed by a text string describing the response to a command. More...
 
virtual PBoolean ReadResponse (int &code, PString &info)
 
virtual int ExecuteCommand (PINDEX cmdNumber)
 Write a command to the socket, using WriteCommand() and await a response using ReadResponse(). More...
 
virtual int ExecuteCommand (PINDEX cmdNumber, const PString &param)
 
int GetLastResponseCode () const
 Return the code associated with the last response received by the socket. More...
 
PString GetLastResponseInfo () const
 Return the last response received by the socket. More...
 
- Public Member Functions inherited from PIndirectChannel
 PIndirectChannel ()
 Create a new indirect channel without any channels to redirect to. More...
 
 ~PIndirectChannel ()
 Close the indirect channel, deleting read/write channels if desired. More...
 
Comparison Compare (const PObject &obj) const
 Determine if the two objects refer to the same indirect channel. More...
 
virtual PString GetName () const
 Get the name of the channel. More...
 
virtual PBoolean Close ()
 Close the channel. More...
 
virtual PBoolean IsOpen () const
 Determine if the channel is currently open and read and write operations can be executed on it. More...
 
virtual PBoolean Shutdown (ShutdownValue option)
 Close one or both of the data streams associated with a channel. More...
 
virtual bool SetLocalEcho (bool localEcho)
 Set local echo mode. More...
 
virtual PChannelGetBaseReadChannel () const
 This function returns the eventual base channel for reading of a series of indirect channels provided by descendents of PIndirectChannel. More...
 
virtual PChannelGetBaseWriteChannel () const
 This function returns the eventual base channel for writing of a series of indirect channels provided by descendents of PIndirectChannel. More...
 
virtual PString GetErrorText (ErrorGroup group=NumErrorGroups) const
 Get error message description. More...
 
PBoolean Open (PChannel &channel)
 Set the channel for both read and write operations. More...
 
PBoolean Open (PChannel *channel, PBoolean autoDelete=true)
 Set the channel for both read and write operations. More...
 
PBoolean Open (PChannel *readChannel, PChannel *writeChannel, PBoolean autoDeleteRead=true, PBoolean autoDeleteWrite=true)
 Set the channel for both read and write operations. More...
 
PChannelGetReadChannel () const
 Get the channel used for read operations. More...
 
bool SetReadChannel (PChannel *channel, bool autoDelete=true, bool closeExisting=false)
 Set the channel for read operations. More...
 
PChannelGetWriteChannel () const
 Get the channel used for write operations. More...
 
PBoolean SetWriteChannel (PChannel *channel, bool autoDelete=true, bool closeExisting=false)
 Set the channel for read operations. More...
 
- Public Member Functions inherited from PChannel
PBoolean SetErrorValues (Errors errorCode, int osError, ErrorGroup group=LastGeneralError)
 Set error values to those specified. More...
 
 PChannel ()
 Create the channel. More...
 
 ~PChannel ()
 Close down the channel. More...
 
virtual PINDEX HashFunction () const
 Calculate a hash value for use in sets and dictionaries. More...
 
int GetHandle () const
 Get the integer operating system handle for the channel. More...
 
void SetReadTimeout (const PTimeInterval &time)
 Set the timeout for read operations. More...
 
PTimeInterval GetReadTimeout () const
 Get the timeout for read operations. More...
 
virtual PINDEX GetLastReadCount () const
 Get the number of bytes read by the last Read() call. More...
 
virtual int ReadChar ()
 Read a single 8 bit byte from the channel. More...
 
PBoolean ReadBlock (void *buf, PINDEX len)
 Read len bytes into the buffer from the channel. More...
 
PString ReadString (PINDEX len)
 Read len character into a string from the channel. More...
 
virtual PBoolean ReadAsync (void *buf, PINDEX len)
 Begin an asynchronous read from channel. More...
 
virtual void OnReadComplete (void *buf, PINDEX len)
 User callback function for when a ReadAsync() call has completed or timed out. More...
 
void SetWriteTimeout (const PTimeInterval &time)
 Set the timeout for write operations to complete. More...
 
PTimeInterval GetWriteTimeout () const
 Get the timeout for write operations to complete. More...
 
virtual PBoolean Write (const void *buf, PINDEX len, const void *mark)
 Low level write to the channel with marker. More...
 
virtual PINDEX GetLastWriteCount () const
 Get the number of bytes written by the last Write() call. More...
 
PBoolean WriteChar (int c)
 Write a single character to the channel. More...
 
PBoolean WriteString (const PString &str)
 Write a string to the channel. More...
 
virtual PBoolean WriteAsync (const void *buf, PINDEX len)
 Begin an asynchronous write from channel. More...
 
virtual void OnWriteComplete (const void *buf, PINDEX len)
 User callback function for when a WriteAsync() call has completed or timed out. More...
 
virtual bool FlowControl (const void *flowData)
 Flow Control information Pass data to the channel for flowControl determination. More...
 
PBoolean SetBufferSize (PINDEX newSize)
 Set the iostream buffer size for reads and writes. More...
 
PBoolean SendCommandString (const PString &command)
 Send a command meta-string. More...
 
void AbortCommandString ()
 Abort a command string that is in progress. More...
 
Errors GetErrorCode (ErrorGroup group=NumErrorGroups) const
 Get normalised error code. More...
 
int GetErrorNumber (ErrorGroup group=NumErrorGroups) const
 Get OS errro code. More...
 
virtual PBoolean Read (const VectorOfSlice &slices)
 Low level scattered read from the channel. More...
 
virtual PBoolean Write (const VectorOfSlice &slices)
 Low level scattered write to the channel. More...
 
- Public Member Functions inherited from PObject
virtual ~PObject ()
 
virtual PObjectClone () const
 Create a copy of the class on the heap. More...
 
virtual const char * GetClass (unsigned ancestor=0) const
 Get the current dynamic type of the object instance. More...
 
PBoolean IsClass (const char *cls) const
 
virtual PBoolean InternalIsDescendant (const char *clsName) const
 Determine if the dynamic type of the current instance is a descendent of the specified class. More...
 
virtual Comparison CompareObjectMemoryDirect (const PObject &obj) const
 Determine the byte wise comparison of two objects. More...
 
bool operator== (const PObject &obj) const
 Compare the two objects. More...
 
bool operator!= (const PObject &obj) const
 Compare the two objects. More...
 
bool operator< (const PObject &obj) const
 Compare the two objects. More...
 
bool operator> (const PObject &obj) const
 Compare the two objects. More...
 
bool operator<= (const PObject &obj) const
 Compare the two objects. More...
 
bool operator>= (const PObject &obj) const
 Compare the two objects. More...
 
virtual void PrintOn (ostream &strm) const
 Output the contents of the object to the stream. More...
 
virtual void ReadFrom (istream &strm)
 Input the contents of the object from the stream. More...
 

Protected Types

enum  { WasMAIL, WasSEND, WasSAML, WasSOML }
 
- Protected Types inherited from PInternetProtocol
enum  StuffState {
  DontStuff, StuffIdle, StuffCR, StuffCRLF,
  StuffCRLFdot, StuffCRLFdotCR
}
 

Protected Member Functions

PBoolean OnOpen ()
 This callback is executed when the Open() function is called with open channels. More...
 
virtual void OnHELO (const PCaselessString &remoteHost)
 
virtual void OnEHLO (const PCaselessString &remoteHost)
 
virtual void OnQUIT ()
 
virtual void OnHELP ()
 
virtual void OnNOOP ()
 
virtual void OnTURN ()
 
virtual void OnRSET ()
 
virtual void OnVRFY (const PCaselessString &name)
 
virtual void OnEXPN (const PCaselessString &name)
 
virtual void OnRCPT (const PCaselessString &recipient)
 
virtual void OnMAIL (const PCaselessString &sender)
 
virtual void OnSEND (const PCaselessString &sender)
 
virtual void OnSAML (const PCaselessString &sender)
 
virtual void OnSOML (const PCaselessString &sender)
 
virtual void OnDATA ()
 
virtual PBoolean OnUnknown (const PCaselessString &command)
 Handle an unknown command. More...
 
virtual void OnSendMail (const PCaselessString &sender)
 
virtual PBoolean OnTextData (PCharArray &buffer, PBoolean &completed)
 Read a standard text message that is being received by the socket. More...
 
virtual PBoolean OnMIMEData (PCharArray &buffer, PBoolean &completed)
 Read an eight bit MIME message that is being received by the socket. More...
 
- Protected Member Functions inherited from PSMTP
 PSMTP ()
 
- Protected Member Functions inherited from PInternetProtocol
 PInternetProtocol (const char *defaultServiceName, PINDEX cmdCount, char const *const *cmdNames)
 
virtual PINDEX ParseResponse (const PString &line)
 Parse a response line string into a response code and any extra info on the line. More...
 
- Protected Member Functions inherited from PChannel
 PChannel (const PChannel &)
 
PChanneloperator= (const PChannel &)
 
virtual PBoolean ConvertOSError (int libcReturnValue, ErrorGroup group=LastGeneralError)
 Convert an operating system error into platform independent error. More...
 
int ReadCharWithTimeout (PTimeInterval &timeout)
 Read a character with specified timeout. More...
 
PBoolean ReceiveCommandString (int nextChar, const PString &reply, PINDEX &pos, PINDEX start)
 
PBoolean PXSetIOBlock (PXBlockType type, const PTimeInterval &timeout)
 
int PXClose ()
 
- Protected Member Functions inherited from PObject
 PObject ()
 Constructor for PObject, made protected so cannot ever create one on its own. More...
 

Protected Attributes

PBoolean extendedHello
 
PBoolean eightBitMIME
 
PString fromAddress
 
PString fromPath
 
PStringList toNames
 
PStringList toDomains
 
PINDEX messageBufferSize
 
enum PSMTPServer:: { ... }  sendCommand
 
StuffState endMIMEDetectState
 
- Protected Attributes inherited from PInternetProtocol
PString defaultServiceName
 
PStringArray commandNames
 
PCharArray unReadBuffer
 
PINDEX unReadCount
 
PTimeInterval readLineTimeout
 
enum PInternetProtocol::StuffState stuffingState
 
PBoolean newLineToCRLF
 
int lastResponseCode
 
PString lastResponseInfo
 
- Protected Attributes inherited from PIndirectChannel
PChannelreadChannel
 Channel for read operations. More...
 
PBoolean readAutoDelete
 Automatically delete read channel on destruction. More...
 
PChannelwriteChannel
 Channel for write operations. More...
 
PBoolean writeAutoDelete
 Automatically delete write channel on destruction. More...
 
PReadWriteMutex channelPointerMutex
 Race condition prevention on closing channel. More...
 
- Protected Attributes inherited from PChannel
int os_handle
 The operating system file handle return by standard open() function. More...
 
Errors lastErrorCode [NumErrorGroups+1]
 The platform independant error code. More...
 
int lastErrorNumber [NumErrorGroups+1]
 The operating system error number (eg as returned by errno). More...
 
PINDEX lastReadCount
 Number of byte last read by the Read() function. More...
 
PINDEX lastWriteCount
 Number of byte last written by the Write() function. More...
 
PTimeInterval readTimeout
 Timeout for read operations. More...
 
PTimeInterval writeTimeout
 Timeout for write operations. More...
 
PString channelName
 
PMutex px_threadMutex
 
PXBlockType px_lastBlockType
 
PThreadpx_readThread
 
PThreadpx_writeThread
 
PMutex px_writeMutex
 
PThreadpx_selectThread [3]
 
PMutex px_selectMutex [3]
 

Additional Inherited Members

- Static Public Member Functions inherited from PChannel
static PBoolean ConvertOSError (int libcReturnValue, Errors &lastError, int &osError)
 Convert an operating system error into platform independent error. More...
 
static PString GetErrorText (Errors lastError, int osError=0)
 Get error message description. More...
 
- Static Public Member Functions inherited from PObject
static const char * Class ()
 Get the name of the class as a C string. More...
 
static Comparison InternalCompareObjectMemoryDirect (const PObject *obj1, const PObject *obj2, PINDEX size)
 Internal function caled from CompareObjectMemoryDirect() More...
 

Detailed Description

A TCP/IP socket for the Simple Mail Transfer Protocol.

When acting as a client, the procedure is to make the connection to a remote server, then to send a message using the following procedure: PSMTPSocket mail("mailserver"); if (mail.IsOpen()) { mail.BeginMessage("Me@here.com.au", "Fred@somwhere.com"); mail.Write(myMessage); if (!mail.EndMessage()) PError << "Mail send failed." << endl; } else PError << "Mail conection failed." << endl;

When acting as a server, a descendant class would be created to override at least the LookUpName() and HandleMessage() functions. Other functions may be overridden for further enhancement to the sockets capabilities, but these two will give a basic SMTP server functionality.

The server socket thread would continuously call the ProcessMessage() function until it returns false. This will then call the appropriate virtual function on parsing the SMTP protocol.

Member Enumeration Documentation

anonymous enum
protected
Enumerator
WasMAIL 
WasSEND 
WasSAML 
WasSOML 
Enumerator
LocalDomain 

User may be on local machine, do LookUpName().

WillForward 

User may be forwarded to another SMTP host.

CannotForward 

User cannot be forwarded.

Enumerator
ValidUser 

User name was valid and unique.

AmbiguousUser 

User name was valid but ambiguous.

UnknownUser 

User name was invalid.

LookUpError 

Some other error occurred in look up.

Constructor & Destructor Documentation

PSMTPServer::PSMTPServer ( )

Create a TCP/IP SMPTP protocol socket channel.

The parameterless form creates an unopened socket, the form with the address parameter makes a connection to a remote system, opening the socket. The form with the socket parameter opens the socket to an incoming call from a "listening" socket.

Member Function Documentation

virtual ForwardResult PSMTPServer::ForwardDomain ( PCaselessString userDomain,
PCaselessString forwardDomainList 
)
virtual

Determine if a user for this domain may be on the local system, or should be forwarded.

Returns
Result of forward check operation.
Parameters
userDomainDomain for user
forwardDomainListDomains forwarding to
virtual PBoolean PSMTPServer::HandleMessage ( PCharArray buffer,
PBoolean  starting,
PBoolean  completed 
)
virtual

Handle a received message.

The buffer parameter contains the partial or complete message received, depending on the completed parameter.

The default behaviour is to simply return false;

Returns
true if message was handled, false if an error occurs.
Parameters
bufferBuffer containing message data received.
startingThis is the first call for the message.
completedThis is the last call for the message. Indication that the entire message has been received.
virtual LookUpResult PSMTPServer::LookUpName ( const PCaselessString name,
PString expandedName 
)
virtual

Look up a name in the context of the SMTP server.

The default bahaviour simply returns false.

Returns
Result of name look up operation.
Parameters
nameName to look up.
expandedNameExpanded form of name (if found).
virtual void PSMTPServer::OnDATA ( )
protectedvirtual
virtual void PSMTPServer::OnEHLO ( const PCaselessString remoteHost)
protectedvirtual
Parameters
remoteHostName of remote host.
virtual void PSMTPServer::OnEXPN ( const PCaselessString name)
protectedvirtual
Parameters
nameName to expand.
virtual void PSMTPServer::OnHELO ( const PCaselessString remoteHost)
protectedvirtual
Parameters
remoteHostName of remote host.
virtual void PSMTPServer::OnHELP ( )
protectedvirtual
virtual void PSMTPServer::OnMAIL ( const PCaselessString sender)
protectedvirtual
Parameters
senderName of sender.
virtual PBoolean PSMTPServer::OnMIMEData ( PCharArray buffer,
PBoolean completed 
)
protectedvirtual

Read an eight bit MIME message that is being received by the socket.

The MIME message is terminated by the CR/LF/./CR/LF sequence.

The default behaviour is to read the data into the buffer parameter until either the end of the message or when the messageBufferSize bytes have been read.

Returns
true if partial message received, false if the end of the data was received.
virtual void PSMTPServer::OnNOOP ( )
protectedvirtual
PBoolean PSMTPServer::OnOpen ( )
protectedvirtual

This callback is executed when the Open() function is called with open channels.

It may be used by descendent channels to do any handshaking required by the protocol that channel embodies.

The default behaviour is to simply return true.

Returns
Returns true if the protocol handshaking is successful.

Reimplemented from PIndirectChannel.

virtual void PSMTPServer::OnQUIT ( )
protectedvirtual
virtual void PSMTPServer::OnRCPT ( const PCaselessString recipient)
protectedvirtual
Parameters
recipientName of recipient.
virtual void PSMTPServer::OnRSET ( )
protectedvirtual
virtual void PSMTPServer::OnSAML ( const PCaselessString sender)
protectedvirtual
Parameters
senderName of sender.
virtual void PSMTPServer::OnSEND ( const PCaselessString sender)
protectedvirtual
Parameters
senderName of sender.
virtual void PSMTPServer::OnSendMail ( const PCaselessString sender)
protectedvirtual
Parameters
senderName of sender.
virtual void PSMTPServer::OnSOML ( const PCaselessString sender)
protectedvirtual
Parameters
senderName of sender.
virtual PBoolean PSMTPServer::OnTextData ( PCharArray buffer,
PBoolean completed 
)
protectedvirtual

Read a standard text message that is being received by the socket.

The text message is terminated by a line with a '.' character alone.

The default behaviour is to read the data into the buffer parameter until either the end of the message or when the messageBufferSize bytes have been read.

Returns
true if partial message received, false if the end of the data was received.
virtual void PSMTPServer::OnTURN ( )
protectedvirtual
virtual PBoolean PSMTPServer::OnUnknown ( const PCaselessString command)
protectedvirtual

Handle an unknown command.

Returns
true if more processing may be done, false if the ProcessCommand() function is to return false.
Parameters
commandComplete command line received.
virtual void PSMTPServer::OnVRFY ( const PCaselessString name)
protectedvirtual
Parameters
nameName to verify.
PBoolean PSMTPServer::ProcessCommand ( )

Process commands, dispatching to the appropriate virtual function.

This is used when the socket is acting as a server.

Returns
true if more processing may be done, false if the QUIT command was received or the OnUnknown() function returns false.
void PSMTPServer::ServerReset ( )

Member Data Documentation

PBoolean PSMTPServer::eightBitMIME
protected
StuffState PSMTPServer::endMIMEDetectState
protected
PBoolean PSMTPServer::extendedHello
protected
PString PSMTPServer::fromAddress
protected
PString PSMTPServer::fromPath
protected
PINDEX PSMTPServer::messageBufferSize
protected
enum { ... } PSMTPServer::sendCommand
PStringList PSMTPServer::toDomains
protected
PStringList PSMTPServer::toNames
protected

The documentation for this class was generated from the following file: