spsmtp.cpp
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/*
* Copyright 2009 Stephen Liu
* For license terms, see the file COPYING along with this library.
*/
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "spsmtp.hpp"
#include "spbuffer.hpp"
#include "sphandler.hpp"
#include "sprequest.hpp"
#include "spresponse.hpp"
#include "spmsgdecoder.hpp"
#include "sputils.hpp"
SP_SmtpHandler :: ~SP_SmtpHandler()
{
}
void SP_SmtpHandler :: error()
{
}
void SP_SmtpHandler :: timeout()
{
}
int SP_SmtpHandler :: welcome( const char * clientIP, const char * serverIP, SP_Buffer * reply )
{
reply->append( "220 SMTP service ready\n" );
return eAccept;
}
int SP_SmtpHandler :: help( const char * args, SP_Buffer * reply )
{
reply->append( "250 HELP HELO EHLO MAIL RCPT DATA NOOP RSET QUIT\r\n" );
return eAccept;
}
int SP_SmtpHandler :: helo( const char * args, SP_Buffer * reply )
{
reply->append( "250 OK\n" );
return eAccept;
}
int SP_SmtpHandler :: ehlo( const char * args, SP_Buffer * reply )
{
reply->append( "250-OK\n" );
reply->append( "250-AUTH=LOGIN\n" );
reply->append( "250 HELP\n" );
return eAccept;
}
int SP_SmtpHandler :: auth( const char * user, const char * pass, SP_Buffer * reply )
{
reply->append( "535 Authenticate failed\n" );
return eReject;
}
int SP_SmtpHandler :: noop( const char * args, SP_Buffer * reply )
{
reply->append( "250 OK\n" );
return eAccept;
}
//---------------------------------------------------------
SP_SmtpHandlerList :: SP_SmtpHandlerList()
{
mList = new SP_ArrayList();
}
SP_SmtpHandlerList :: ~SP_SmtpHandlerList()
{
for( int i = 0; i < mList->getCount(); i++ ) {
delete (SP_SmtpHandler*)mList->getItem(i);
}
delete mList, mList = NULL;
}
int SP_SmtpHandlerList :: getCount()
{
return mList->getCount();
}
void SP_SmtpHandlerList :: append( SP_SmtpHandler * handler )
{
mList->append( handler );
}
SP_SmtpHandler * SP_SmtpHandlerList :: getItem( int index )
{
return (SP_SmtpHandler*)mList->getItem( index );
}
//---------------------------------------------------------
SP_SmtpHandlerFactory :: ~SP_SmtpHandlerFactory()
{
}
//---------------------------------------------------------
class SP_SmtpSession {
public:
SP_SmtpSession( SP_SmtpHandlerFactory * handlerFactory );
~SP_SmtpSession();
enum { eStepOther = 0, eStepUser = 1, eStepPass = 2 };
void setAuthStep( int step );
int getAuthStep();
void setUser( const char * user );
const char * getUser();
void setPass( const char * pass );
const char * getPass();
void setSeenAuth( int seenAuth );
int getSeenAuth();
void setSeenHelo( int seenHelo );
int getSeenHelo();
void setSeenSender( int seenSender );
int getSeenSender();
void addRcpt();
int getRcptCount();
void setDataMode( int mode );
int getDataMode();
int getSeenData();
void reset();
SP_SmtpHandler * getHandler();
private:
int mAuthStep;
int mSeenAuth;
char mUser[ 128 ], mPass[ 128 ];
int mSeenHelo;
int mSeenSender;
int mRcptCount;
int mSeenData;
int mDataMode;
SP_SmtpHandler * mHandler;
SP_SmtpHandlerFactory * mHandlerFactory;
};
SP_SmtpSession :: SP_SmtpSession( SP_SmtpHandlerFactory * handlerFactory )
{
mHandler = NULL;
mHandlerFactory = handlerFactory;
mSeenHelo = 0;
mSeenAuth = 0;
mAuthStep = eStepOther;
memset( mUser, 0, sizeof( mUser ) );
memset( mPass, 0, sizeof( mPass ) );
reset();
}
SP_SmtpSession :: ~SP_SmtpSession()
{
if( NULL != mHandler ) delete mHandler;
}
void SP_SmtpSession :: reset()
{
mSeenSender = 0;
mRcptCount = 0;
mSeenData = 0;
mDataMode = 0;
}
void SP_SmtpSession :: setAuthStep( int step )
{
mAuthStep = step;
}
int SP_SmtpSession :: getAuthStep()
{
return mAuthStep;
}
void SP_SmtpSession :: setUser( const char * user )
{
sp_strlcpy( mUser, user, sizeof( mUser ) );
}
const char * SP_SmtpSession :: getUser()
{
return mUser;
}
void SP_SmtpSession :: setPass( const char * pass )
{
sp_strlcpy( mPass, pass, sizeof( mPass ) );
}
const char * SP_SmtpSession :: getPass()
{
return mPass;
}
void SP_SmtpSession :: setSeenAuth( int seenAuth )
{
mSeenAuth = seenAuth;
}
int SP_SmtpSession :: getSeenAuth()
{
return mSeenAuth;
}
void SP_SmtpSession :: setSeenHelo( int seenHelo )
{
mSeenHelo = seenHelo;
}
int SP_SmtpSession :: getSeenHelo()
{
return mSeenHelo;
}
void SP_SmtpSession :: setSeenSender( int seenSender )
{
mSeenSender = seenSender;
}
int SP_SmtpSession :: getSeenSender()
{
return mSeenSender;
}
void SP_SmtpSession :: addRcpt()
{
mRcptCount++;
}
int SP_SmtpSession :: getRcptCount()
{
return mRcptCount;
}
void SP_SmtpSession :: setDataMode( int mode )
{
mDataMode = mode;
if( 1 == mode ) mSeenData = 1;
}
int SP_SmtpSession :: getDataMode()
{
return mDataMode;
}
int SP_SmtpSession :: getSeenData()
{
return mSeenData;
}
SP_SmtpHandler * SP_SmtpSession :: getHandler()
{
if( NULL == mHandler ) mHandler = mHandlerFactory->create();
return mHandler;
}
//---------------------------------------------------------
class SP_SmtpHandlerAdapter : public SP_Handler {
public:
SP_SmtpHandlerAdapter( SP_SmtpHandlerFactory * handlerFactory );
virtual ~SP_SmtpHandlerAdapter();
// return -1 : terminate session, 0 : continue
virtual int start( SP_Request * request, SP_Response * response );
// return -1 : terminate session, 0 : continue
virtual int handle( SP_Request * request, SP_Response * response );
virtual void error( SP_Response * response );
virtual void timeout( SP_Response * response );
virtual void close();
private:
SP_SmtpSession * mSession;
};
SP_SmtpHandlerAdapter :: SP_SmtpHandlerAdapter( SP_SmtpHandlerFactory * handlerFactory )
{
mSession = new SP_SmtpSession( handlerFactory );
}
SP_SmtpHandlerAdapter :: ~SP_SmtpHandlerAdapter()
{
delete mSession;
}
int SP_SmtpHandlerAdapter :: start( SP_Request * request, SP_Response * response )
{
SP_Buffer * reply = response->getReply()->getMsg();
int ret = mSession->getHandler()->welcome( request->getClientIP(),
request->getServerIP(), reply );
if( NULL == reply->find( "\n", 1 ) ) reply->append( "\n" );
request->setMsgDecoder( new SP_LineMsgDecoder() );
return ret;
}
int SP_SmtpHandlerAdapter :: handle( SP_Request * request, SP_Response * response )
{
int ret = SP_SmtpHandler::eAccept;
SP_Buffer * reply = response->getReply()->getMsg();
if( mSession->getDataMode() ) {
SP_DotTermChunkMsgDecoder * decoder = (SP_DotTermChunkMsgDecoder*)request->getMsgDecoder();
char * data = (char*)decoder->getMsg();
ret = mSession->getHandler()->data( data, reply );
free( data );
mSession->setDataMode( 0 );
request->setMsgDecoder( new SP_LineMsgDecoder() );
} else if( SP_SmtpSession::eStepUser == mSession->getAuthStep() ) {
const char * line = ((SP_LineMsgDecoder*)(request->getMsgDecoder()))->getMsg();
mSession->setUser( line );
mSession->setAuthStep( SP_SmtpSession::eStepPass );
reply->append( "334 UGFzc3dvcmQ6\r\n" );
} else if( SP_SmtpSession::eStepPass == mSession->getAuthStep() ) {
const char * line = ((SP_LineMsgDecoder*)(request->getMsgDecoder()))->getMsg();
mSession->setPass( line );
mSession->setAuthStep( SP_SmtpSession::eStepOther );
ret = mSession->getHandler()->auth( mSession->getUser(), mSession->getPass(), reply );
if( SP_SmtpHandler::eAccept == ret ) mSession->setSeenAuth( 1 );
} else {
const char * line = ((SP_LineMsgDecoder*)(request->getMsgDecoder()))->getMsg();
char cmd[ 128 ] = { 0 };
const char * args = NULL;
sp_strtok( line, 0, cmd, sizeof( cmd ), ' ', &args );
if( 0 == strcasecmp( cmd, "EHLO" ) ) {
if( NULL != args ) {
if( 0 == mSession->getSeenHelo() ) {
ret = mSession->getHandler()->ehlo( args, reply );
if( SP_SmtpHandler::eAccept == ret ) mSession->setSeenHelo( 1 );
} else {
reply->append( "503 Duplicate EHLO\r\n" );
}
} else {
reply->append( "501 Syntax: EHLO <hostname>\r\n" );
}
} else if( 0 == strcasecmp( cmd, "AUTH" ) ) {
if( 0 == mSession->getSeenHelo() ) {
reply->append( "503 Error: send EHLO first\r\n" );
} else if( mSession->getSeenAuth() ) {
reply->append( "503 Duplicate AUTH\r\n" );
} else {
if( NULL != args ) {
if( 0 == strcasecmp( args, "LOGIN" ) ) {
reply->append( "334 VXNlcm5hbWU6\r\n" );
mSession->setAuthStep( SP_SmtpSession::eStepUser );
} else {
reply->append( "504 Unrecognized authentication type.\r\n" );
}
} else {
reply->append( "501 Syntax: AUTH LOGIN\r\n" );
}
}
} else if( 0 == strcasecmp( cmd, "HELO" ) ) {
if( NULL != args ) {
if( 0 == mSession->getSeenHelo() ) {
ret = mSession->getHandler()->helo( args, reply );
if( SP_SmtpHandler::eAccept == ret ) mSession->setSeenHelo( 1 );
} else {
reply->append( "503 Duplicate HELO\r\n" );
}
} else {
reply->append( "501 Syntax: HELO <hostname>\r\n" );
}
} else if( 0 == strcasecmp( cmd, "MAIL" ) ) {
if( 0 == mSession->getSeenHelo() ) {
reply->append( "503 Error: send HELO first\r\n" );
} else if( mSession->getSeenSender() ) {
reply->append( "503 Sender already specified.\r\n" );
} else {
if( NULL != args ) {
if( 0 == strncasecmp( args, "FROM:", 5 ) ) args += 5;
for( ; isspace( *args ); ) args++;
ret = mSession->getHandler()->from( args, reply );
if( SP_SmtpHandler::eAccept == ret ) mSession->setSeenSender( 1 );
} else {
reply->append( "501 Syntax: MAIL FROM:<address>\r\n" );
}
}
} else if( 0 == strcasecmp( cmd, "RCPT" ) ) {
if( 0 == mSession->getSeenHelo() ) {
reply->append( "503 Error: send HELO first\r\n" );
} else if( 0 == mSession->getSeenSender() ) {
reply->append( "503 Error: need MAIL command\r\n" );
} else if( mSession->getSeenData() ) {
reply->append( "503 Bad sequence of commands\r\n" );
} else {
if( NULL != args ) {
if( 0 == strncasecmp( args, "TO:", 3 ) ) args += 3;
for( ; isspace( *args ); ) args++;
ret = mSession->getHandler()->rcpt( args, reply );
if( SP_SmtpHandler::eAccept == ret ) mSession->addRcpt();
} else {
reply->append( "501 Syntax: RCPT TO:<address>\r\n" );
}
}
} else if( 0 == strcasecmp( cmd, "DATA" ) ) {
if( 0 == mSession->getSeenHelo() ) {
reply->append( "503 Error: send HELO first\r\n" );
} else if( 0 == mSession->getSeenSender() ) {
reply->append( "503 Error: need MAIL command\r\n" );
} else if( mSession->getRcptCount() <= 0 ) {
reply->append( "503 Error: need RCPT command\r\n" );
} else {
request->setMsgDecoder( new SP_DotTermChunkMsgDecoder() );
reply->append( "354 Start mail input; end with <CRLF>.<CRLF>\r\n" );
mSession->setDataMode( 1 );
}
} else if( 0 == strcasecmp( cmd, "RSET" ) ) {
ret = mSession->getHandler()->rset( reply );
mSession->reset();
} else if( 0 == strcasecmp( cmd, "NOOP" ) ) {
ret = mSession->getHandler()->noop( args, reply );
} else if( 0 == strcasecmp( cmd, "HELP" ) ) {
ret = mSession->getHandler()->help( args, reply );
} else if( 0 == strcasecmp( cmd, "QUIT" ) ) {
reply->append( "221 Closing connection. Good bye.\r\n" );
ret = SP_SmtpHandler::eClose;
} else {
reply->printf( "500 Syntax error, command unrecognized <%s>.\r\n", cmd );
}
}
if( NULL == reply->find( "\n", 1 ) ) reply->append( "\n" );
return SP_SmtpHandler::eClose == ret ? -1 : 0;
}
void SP_SmtpHandlerAdapter :: error( SP_Response * response )
{
mSession->getHandler()->error();
}
void SP_SmtpHandlerAdapter :: timeout( SP_Response * response )
{
mSession->getHandler()->timeout();
}
void SP_SmtpHandlerAdapter :: close()
{
}
//---------------------------------------------------------
SP_SmtpHandlerAdapterFactory :: SP_SmtpHandlerAdapterFactory( SP_SmtpHandlerFactory * factory )
{
mFactory = factory;
}
SP_SmtpHandlerAdapterFactory :: ~SP_SmtpHandlerAdapterFactory()
{
delete mFactory;
}
SP_Handler * SP_SmtpHandlerAdapterFactory :: create() const
{
return new SP_SmtpHandlerAdapter( mFactory );
}