📄 smtp.cpp
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/*
Module : SMTP.CPP
Purpose: Implementation for a MFC class encapsulation of the SMTP protocol
Created: PJN / 22-05-1998
History: PJN / 15-06-1998 1) Fixed the case where a single dot occurs on its own
in the body of a message
2) Class now supports Reply-To Header Field
3) Class now supports file attachments
PJN / 18-06-1998 1) Fixed a memory overwrite problem which was occurring
with the buffer used for encoding base64 attachments
PJN / 27-06-1998 1) The case where a line begins with a "." but contains
other text is now also catered for. See RFC821, Section 4.5.2
for further details.
2) m_sBody in CSMTPMessage has now been made protected.
Client applications now should call AddBody instead. This
ensures that FixSingleDot is only called once even if the
same message is sent a number of times.
3) Fixed a number of problems with how the MIME boundaries
were defined and sent.
4) Got rid of an unreferenced formal parameter
compiler warning when doing a release build
PJN / 11-09-1998 1) VC 5 project file is now provided
2) Attachment array which the message class contains now uses
references instead of pointers.
3) Now uses Sleep(0) to yield our time slice instead of Sleep(100),
this is the preferred way of writting polling style code in Win32
without serverly impacting performance.
4) All Trace statements now display the value as returned from
GetLastError
5) A number of extra asserts have been added
6) A AddMultipleRecipients function has been added which supports added a
number of recipients at one time from a single string
7) Extra trace statements have been added to help in debugging
PJN / 12-09-98 1) Removed a couple of unreferenced variable compiler warnings when code
was compiled with Visual C++ 6.0
2) Fixed a major bug which was causing an ASSERT when the CSMTPAttachment
destructor was being called in the InitInstance of the sample app.
This was inadvertingly introduced for the 1.2 release. The fix is to revert
fix 2) as done on 11-09-1998. This will also help to reduce the number of
attachment images kept in memory at one time.
PJN / 18-01-99 1) Full CC & BCC support has been added to the classes
PJN / 22-02-99 1) Addition of a Get and SetTitle function which allows a files attachment
title to be different that the original filename
2) AddMultipleRecipients now ignores addresses if they are empty.
3) Improved the reading of responses back from the server by implementing
a growable receive buffer
4) timeout is now 60 seconds when building for debug
PJN / 25-03-99 1) Now sleeps for 250 ms instead of yielding the time slice. This helps
reduce CPU usage when waiting for data to arrive in the socket
PJN / 14-05-99 1) Fixed a bug with the way the code generates time zone fields in the Date headers.
PJN / 10-09-99 1) Improved CSMTPMessage::GetHeader to include mime field even when no attachments
are included.
PJN / 16-02-00 1) Fixed a problem which was occuring when code was compiled with VC++ 6.0.
PJN / 19-03-00 1) Fixed a problem in GetHeader on Non-English Windows machines
2) Now ships with a VC 5 workspace. I accidentally shipped a VC 6 version in one of the previous versions of the code.
3) Fixed a number of UNICODE problems
4) Updated the sample app to deliberately assert before connecting to the author's SMTP server.
PJN / 28-03-00 1) Set the release mode timeout to be 10 seconds. 2 seconds was causing problems for slow dial
up networking connections.
PJN / 07-05-00 1) Addition of some ASSERT's in CSMTPSocket::Connect
PP / 16-06-00 The following modifications were done by Puneet Pawaia
1) Removed the base64 encoder from this file
2) Added the base64 encoder/decoder implementation in a separate
file. This was done because base64 decoding was not part of
the previous implementation
3) Added support for ESMTP connection. The class now attempts to
authenticate the user on the ESMTP server using the username and
passwords supplied. For this connect now takes the username and
passwords as parameters. These can be null in which case ESMTP
authentication is not attempted
4) This class can now handle AUTH LOGIN and AUTH LOGIN PLAIN authentication
schemes on
PP / 19-06-00 The following modifications were done by Puneet Pawaia
1) Added the files md5.* containing the MD5 digest generation code
after modifications so that it compiles with VC++ 6
2) Added the CRAM-MD5 login procedure.
PJN / 10-07-00 1) Fixed a problem with sending attachments > 1K in size
2) Changed the parameters to CSMTPConnection::Connect
PJN / 30-07-00 1) Fixed a bug in AuthLogin which was transmitting the username and password
with an extra "=" which was causing the login to failure. Thanks to Victor Vogelpoel for
finding this.
PJN / 05-09-00 1) Added a CSMTP_NORSA preprocessor macro to allow the CSmtpConnection code to be compiled
without the dependence on the RSA code.
PJN / 28-12-2000 1) Removed an unused variable from ConnectESMTP.
2) Allowed the hostname as sent in the HELO command to be specified at run time
in addition to using the hostname of the client machine
3) Fixed a problem where high ascii characters were not being properly encoded in
the quoted-printable version of the body sent.
4) Added support for user definable charset's for the message body.
5) Mime boundaries are now always sent irrespective if whether attachments are included or
not. This is required as the body is using quoted-printable.
6) Fixed a bug in sendLines which was causing small message bodies to be sent incorrectly
7) Now fully supports custom headers in the SMTP message
8) Fixed a copy and paste bug where the default port for the SMTP socket class was 110.
9) You can now specify the address on which the socket is bound. This enables the programmer
to decide on which NIC data should be sent from. This is especially useful on a machine
with multiple IP addresses.
10) Addition of functions in the SMTP connection class to auto dial and auto disconnect to
the Internet if you so desire.
11) Sample app has been improved to allow Auto Dial and binding to IP addresses to be configured.
PJN / 26-02-2001 1) Charset now defaults to ISO 8859-1 instead of us-ascii
2) Removed a number of unreferrenced variables from the sample app.
3) Headers are now encoded if they contain non ascii characters.
4) Fixed a bug in getLine, Thanks to Lev Evert for spotting this one.
5) Made the charset value a member of the message class instead of the connection class
6) Sample app now fully supports specifying the charset of the message
7) Added a AddMultipleAttachments method to CSMTPMessage
8) Attachments can now be copied to each other via new methods in CSMTPAttachment
9) Message class now contains copies of the attachments instead of pointers to them
10) Sample app now allows multiple attachments to be added
11) Removed an unnecessary assert in QuotedPrintableEncode
12) Added a Mime flag to the CSMTPMessage class which allows you to decide whether or not a message
should be sent as MIME. Note that if you have attachments, then mime is assumed.
13) CSMTPAttachment class has now become CSMTPBodyPart in anticipation of full support for MIME and
MHTML email support
14) Updated copright message in source code and documentation
15) Fixed a bug in GetHeader related to _tsetlocale usage. Thanks to Sean McKinnon for spotting this
problem.
16) Fixed a bug in SendLines when sending small attachments. Thanks to Deng Tao for spotting this
problem.
17) Removed the need for SendLines function entirely.
18) Now fully supports HTML email (aka MHTML)
19) Updated copyright messages in code and in documentation
PJN / 17-06-2001 1) Fixed a bug in CSMTPMessage::HeaderEncode where spaces were not being interpreted correctly. Thanks
to Jim Alberico for spotting this.
2) Fixed 2 issues with ReadResponse both having to do with multi-line responses. Thanks to Chris Hanson
for this update.
PJN / 25-06-2001 1) Code now links in Winsock and RPCRT40 automatically. This avoids client code having to specify it in
their linker settings. Thanks to Malte and Phillip for spotting this issue.
2) Updated sample code in documentation. Thanks to Phillip for spotting this.
3) Improved the code in CSMTPBodyPart::SetText to ensure lines are correctly wrapped. Thanks to
Thomas Moser for this fix.
PJN / 01-07-2001 1) Modified QuotedPrintableEncode to prevent the code to enter in an infinite loop due to a long word i.e.
bigger than SMTP_MAXLINE, in this case, the word is breaked. Thanks to Manuel Gustavo Saraiva for this fix.
2) Provided a new protected variable in CSMTPBodyPart called m_bQuotedPrintable to bypass the
QuotedPrintableEncode function in cases that we don't want that kind of correction. Again thanks to
Manuel Gustavo Saraiva for this fix.
PJN / 15-07-2001 1) Improved the error handling in the function CSMTPMessage::AddMultipleAttachments. In addition the
return value has been changed from BOOL to int
PJN / 11-08-2001 1) Fixed a bug in QuotedPrintableEncode which was wrapping encoding characters across multiple lines.
Thanks to Roy He for spotting this.
2) Provided a "SendMessage" method which sends a email directly from disk. This allows you
to construct your own emails and the use the class just to do the sending. This function also has the
advantage that it efficiently uses memory and reports progress.
3) Provided support for progress notification and cancelling via the "OnSendProgress" virtual method.
PJN / 29-09-2001 1) Fixed a bug in ReadResponse which occured when you disconnected via Dial-Up Networking
while a connection was active. This was originally spotted in my POP3 class.
2) Fixed a problem in CSMTPBodyPart::GetHeader which was always including the "quoted-printable" even when
m_bQuotedPrintable for that body part was FALSE. Thanks to "jason" for spotting this.
PJN / 12-10-2001 1) Fixed a problem where GetBody was reporting the size as 1 bigger than it should have been. Thanks
to "c f" for spotting this problem.
2) Fixed a bug in the TRACE statements when a socket connection cannot be made.
3) The sample app now displays a filter of "All Files" when selecting attachments to send
4) Fixed a problem sending 0 byte attachments. Thanks to Deng Tao for spotting this problem.
PJN / 11-01-2002 1) Now includes a method to send a message directly from memory. Thanks to Tom Allebrandi for this
suggestion.
2) Change function name "IsReadible" to be "IsReadable". I was never very good at English!.
3) Fixed a bug in CSMTPBodyPart::QuotedPrintableEncode. If a line was exactly 76 characters long plus
\r\n it produced an invalid soft linebreak of "\r=\r\n\n". Thanks to Gerald Egert for spotting this problem.
.
Copyright (c) 1998 - 2002 by PJ Naughter. (Web: www.naughter.com, Email: pjna@naughter.com)
All rights reserved.
Copyright / Usage Details:
You are allowed to include the source code in any product (commercial, shareware, freeware or otherwise)
when your product is released in binary form. You are allowed to modify the source code in any way you want
except you cannot modify the copyright details at the top of each module. If you want to distribute source
code with your application, then you are only allowed to distribute versions released by the author. This is
to maintain a single distribution point for the source code.
*/
//////////////// Includes ////////////////////////////////////////////
#include "stdafx.h"
#include <locale.h>
#include "smtp.h"
#ifndef CSMTP_NORSA
#include "glob-md5.h"
#include "md5.h"
#endif
#include <wininet.h>
//////////////// Macros / Locals /////////////////////////////////////
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define SMTP_MAXLINE 76
//Link in Winsock dll automatically
#pragma comment(lib, "wsock32.lib")
//Link in RPC runtimes dll automatically
#pragma comment(lib, "rpcrt4.lib")
//////////////// Implementation //////////////////////////////////////
//Class which handles function which must be constructed at run time
//since we cannot absolutely gurantee wininet will be available. To avoid the loader
//bringing up a message such as "Failed to load due to missing export...", the
//functions are constructed using GetProcAddress. The SMTP functions then checks to
//see if the function pointers are NULL and if it is it returns failure and sets the
//error code ERROR_CALL_NOT_IMPLEMENTED which is what the OS would have done if it had
//implemented a stub for it in the first place !!
class _WININET_DATA
{
public:
//Constructors /Destructors
_WININET_DATA();
~_WININET_DATA();
//typedefs of the function pointers
typedef BOOL (WINAPI INTERNETGETCONNECTEDSTATE)(LPDWORD, DWORD);
typedef INTERNETGETCONNECTEDSTATE* LPINTERNETGETCONNECTEDSTATE;
typedef BOOL (WINAPI INTERNETAUTODIALHANGUP)(DWORD);
typedef INTERNETAUTODIALHANGUP* LPINTERNETAUTODIALHANGUP;
typedef BOOL (WINAPI INTERNETATTEMPCONNECT)(DWORD);
typedef INTERNETATTEMPCONNECT* LPINTERNETATTEMPCONNECT;
//Member variables
HINSTANCE m_hWininet; //Instance handle of the "Wininet.dll" which houses the 2 functions we want
LPINTERNETGETCONNECTEDSTATE m_lpfnInternetGetConnectedState;
LPINTERNETAUTODIALHANGUP m_lpfnInternetAutoDialHangup;
LPINTERNETATTEMPCONNECT m_lpfnInternetAttemptConnect;
};
_WININET_DATA::_WININET_DATA()
{
m_hWininet = LoadLibrary(_T("WININET.DLL"));
if (m_hWininet)
{
m_lpfnInternetGetConnectedState = (LPINTERNETGETCONNECTEDSTATE) GetProcAddress(m_hWininet, "InternetGetConnectedState");
m_lpfnInternetAutoDialHangup = (LPINTERNETAUTODIALHANGUP) GetProcAddress(m_hWininet, "InternetAutodialHangup");
m_lpfnInternetAttemptConnect = (LPINTERNETATTEMPCONNECT) GetProcAddress(m_hWininet, "InternetAttemptConnect");
}
}
_WININET_DATA::~_WININET_DATA()
{
if (m_hWininet)
{
FreeLibrary(m_hWininet);
m_hWininet = NULL;
}
}
//The local variable which handle the function pointers
_WININET_DATA _WinInetData;
CSMTPSocket::CSMTPSocket()
{
m_hSocket = INVALID_SOCKET; //default to an invalid scoket descriptor
}
CSMTPSocket::~CSMTPSocket()
{
Close();
}
BOOL CSMTPSocket::Create()
{
m_hSocket = socket(AF_INET, SOCK_STREAM, 0);
return (m_hSocket != INVALID_SOCKET);
}
BOOL CSMTPSocket::Connect(LPCTSTR pszHostAddress, int nPort, LPCTSTR pszLocalBoundAddress)
{
ASSERT(pszHostAddress); //验证主机地址
ASSERT(_tcslen(pszHostAddress));
USES_CONVERSION;
//验证是否socket被创建
ASSERT(m_hSocket != INVALID_SOCKET);
//绑定本地地址
if (pszLocalBoundAddress && _tcslen(pszLocalBoundAddress))
{
LPSTR lpszAsciiLocalAddress = T2A((LPTSTR)pszLocalBoundAddress);
SOCKADDR_IN sockLocalAddress;
ZeroMemory(&sockLocalAddress, sizeof(sockLocalAddress));
sockLocalAddress.sin_family = AF_INET;
sockLocalAddress.sin_port = htons(0);
sockLocalAddress.sin_addr.s_addr = inet_addr(lpszAsciiLocalAddress);
//域名转换
if (sockLocalAddress.sin_addr.s_addr == INADDR_NONE)
{
LPHOSTENT lphost;
lphost = gethostbyname(lpszAsciiLocalAddress);
if (lphost != NULL)
sockLocalAddress.sin_addr.s_addr = ((LPIN_ADDR)lphost->h_addr)->s_addr;
else
{
WSASetLastError(WSAEINVAL);
return FALSE;
}
}
//绑定
if (bind(m_hSocket, (sockaddr*) &sockLocalAddress, sizeof(sockLocalAddress)) == SOCKET_ERROR)
return FALSE;
}
//远程服务器地址
LPSTR lpszAsciiDestination = T2A((LPTSTR)pszHostAddress);
SOCKADDR_IN sockDestinationAddr;
ZeroMemory(&sockDestinationAddr, sizeof(sockDestinationAddr));
sockDestinationAddr.sin_family = AF_INET;
sockDestinationAddr.sin_port = htons((u_short)nPort);
sockDestinationAddr.sin_addr.s_addr = inet_addr(lpszAsciiDestination);
if (sockDestinationAddr.sin_addr.s_addr == INADDR_NONE)
{
LPHOSTENT lphost;
lphost = gethostbyname(lpszAsciiDestination);
if (lphost != NULL)
sockDestinationAddr.sin_addr.s_addr = ((LPIN_ADDR)lphost->h_addr)->s_addr;
else
{
WSASetLastError(WSAEINVAL);
return FALSE;
}
}
//调用另外一个多态函数connect连接到服务器
return Connect((SOCKADDR*)&sockDestinationAddr, sizeof(sockDestinationAddr));
}
BOOL CSMTPSocket::Connect(const SOCKADDR* lpSockAddr, int nSockAddrLen)
{
return (connect(m_hSocket, lpSockAddr, nSockAddrLen) != SOCKET_ERROR);
}
BOOL CSMTPSocket::Send(LPCSTR pszBuf, int nBuf)
{
//must have been created first
ASSERT(m_hSocket != INVALID_SOCKET);
return (send(m_hSocket, pszBuf, nBuf, 0) != SOCKET_ERROR);
}
int CSMTPSocket::Receive(LPSTR pszBuf, int nBuf)
{
//must have been created first
ASSERT(m_hSocket != INVALID_SOCKET);
return recv(m_hSocket, pszBuf, nBuf, 0);
}
void CSMTPSocket::Close()
{
if (m_hSocket != INVALID_SOCKET)
{
VERIFY(SOCKET_ERROR != closesocket(m_hSocket));
m_hSocket = INVALID_SOCKET;
}
}
BOOL CSMTPSocket::IsReadable(BOOL& bReadible)
{
timeval timeout = {0, 0};
fd_set fds;
FD_ZERO(&fds);
FD_SET(m_hSocket, &fds);
int nStatus = select(0, &fds, NULL, NULL, &timeout);
if (nStatus == SOCKET_ERROR)
{
return FALSE;
}
else
{
bReadible = !(nStatus == 0);
return TRUE;
}
}
CSMTPAddress::CSMTPAddress()
{
}
CSMTPAddress::CSMTPAddress(const CSMTPAddress& address)
{
*this = address;
}
CSMTPAddress::CSMTPAddress(const CString& sAddress) :
m_sEmailAddress(sAddress)
{
ASSERT(m_sEmailAddress.GetLength()); //An empty address is not allowed
}
CSMTPAddress::CSMTPAddress(const CString& sFriendly, const CString& sAddress) :
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