CFastSmtp - Fast and easy SMTP class...

Introduction

zSmtp v1.1

Win32 SMTP Wrapper with handy local ip and hostname functions.

Notes

A real basic SMTP wrapper. I tried to find one, but I couldn't - so here is another one. It is fast and straight forward - just instantiate the class with a SMTP server and then set the sender email property and message body. The rest of the settings are pretty much optional. There are also a couple of nice utility functions for getting your local hostname and local ip address.

We hope this code helps you out!

To Do

• UUEncode/Decode
• Attachments

Usage

CFastSmtp mail;

if (mail.ConnectServer("SERVER")) {
    mail.SetSenderName("Sender's Name");
    mail.SetSenderEmail("senders@address.com");
    mail.SetSubject("CFastSmtp v1.1 Release");

    mail.AddRecipient("test@test.com");
    mail.AddCCRecipient("test@test.com");
    mail.AddBCCRecipient("test@test.com");

    mail.SetMessageBody("Here is another test of CFastSmtp SMTP class!");
    
    if (mail.GetConnectStatus()) {        
        printf(mail.Send() ? "Send was a success!" : "Send failed!");
        mail.Disconnect();                    
    }
}   

Source Code

Here is the source (FastSmtp.cpp):

//********************************************************************
/*
  Fast & Simple SMTP Class

  Author:
    christopher w. backen <immortal@cox.net>    
  Purpose:
    Simple smtp class with handy local ip and hostname functions
  ToDo:
    Attachments & UUEncode/Decode
*/
//********************************************************************
//*** Change History
//*** DEVELOPER             DATE        MODIFICATION
//*** 
//*** christopher w. backen 09.05.2002    Misc. updates and corrections
//*** christopher w. backen    08.28.2001    Bug fixes & code changes
//*** christopher w. backen    04.12.2001    Release
//***
//********************************************************************



#include "stdafx.h"
#include "FastSmtp.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CFastSmtp::CFastSmtp()
{
    // Initialize variables
    bCon            = false;

    m_pcFromEmail    = NULL;
    m_pcFromName    = NULL;
    m_pcSubject        = NULL;
    m_pcMsgBody        = NULL;
    m_pcXMailer        = NULL;
    m_pcReplyTo        = NULL;
    m_pcIPAddr        = NULL;

    // Initialize WinSock
    WORD wVer    = MAKEWORD(2,2);    
    if (WSAStartup(wVer,&wsaData) != NO_ERROR) {
        printf("WSAStartup %d\r\n", WSAGetLastError());        
        throw; 
    }
    if (LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) {
        printf("Can't find a useable WinSock DLL\r\n");
        WSACleanup();
        throw; 
    }    
}

CFastSmtp::~CFastSmtp()
{
    // Free recipient lists
    for (unsigned int n = 0; n < Recipients.size(); n++)
        delete Recipients[n];
    for (unsigned int n = 0; n < CCRecipients.size(); n++)
        delete CCRecipients[n];
    for (unsigned int n = 0; n < BCCRecipients.size(); n++)
        delete BCCRecipients[n];

    // Free variables
    if (m_pcFromEmail)
        delete m_pcFromEmail;
    if (m_pcFromName)
        delete m_pcFromName;
    if (m_pcSubject)
        delete m_pcSubject;
    if (m_pcMsgBody)
        delete m_pcMsgBody;
    if (m_pcXMailer)
        delete m_pcXMailer;
    if (m_pcReplyTo)
        delete m_pcReplyTo;

    // Close connection
    if (bCon)
        Disconnect();

    // Cleanup
    WSACleanup();
}

bool CFastSmtp::AddRecipient(const char email[], const char name[])
{
    assert(email);

    int s=strlen(email);
    if (s==0)
        return false;

    CRecipient *pRec = new CRecipient();

    char *pcBuf = new char[s+strlen(name)+4];
     sprintf(pcBuf,"%s<%s>",name,email);    
     pRec->SetEmail(pcBuf);
     Recipients.insert(Recipients.end(), pRec);
    delete pcBuf;

    return (true);    
}

bool CFastSmtp::AddCCRecipient(const char email[], const char name[])
{
    assert(email);

    int s=strlen(email);
    if (s==0)
        return false;

    CRecipient *pRec = new CRecipient();    

    char *pcBuf = new char[s+strlen(name)+4];
     sprintf(pcBuf,"%s<%s>",name,email);    
     pRec->SetEmail(pcBuf);
     CCRecipients.insert(CCRecipients.end(), pRec);
    delete pcBuf;

    return (true);
}

bool CFastSmtp::AddBCCRecipient(const char email[], const char name[])
{
    assert(email);

    int s=strlen(email);
    if (s==0)
        return false;

    CRecipient *pRec = new CRecipient();

    char *pcBuf = new char[s+strlen(name)+4];
     sprintf(pcBuf,"%s<%s>",name,email);    
     pRec->SetEmail(pcBuf);
     BCCRecipients.insert(BCCRecipients.end(), pRec);
    delete pcBuf;    
    
    return (true);
}

bool CFastSmtp::Disconnect()
{
    if (!bCon) {
        printf("Not connected to server!\r\n");
        return (false);
    }

    BYTE        sReceiveBuffer[4096];
    int            iLength = 0;
    int            iEnd = 0;

    if (send(hSocket, (LPSTR)"QUIT\r\n", strlen("QUIT\r\n"),
             NO_FLAGS) == SOCKET_ERROR) {
        printf("Socket send error: %d\r\n", WSAGetLastError());    
        return (false);
    }
    iLength = recv(hSocket, (LPSTR)sReceiveBuffer+iEnd,sizeof(sReceiveBuffer)-iEnd, 
                   NO_FLAGS);
    iEnd += iLength;
    sReceiveBuffer[iEnd] = '\0';

    bCon=false;    

    hSocket=NULL;

    return (true);
}

bool CFastSmtp::Send()
{
// verify sender email
    if (m_pcFromEmail == NULL) {
        printf("Please specifiy a sender email address\r\n");
        return (false);
    }

    BYTE        sReceiveBuffer[4096];
    int            iLength = 0;
    int            iEnd = 0;
    char        buf[4096];
// get proper header
    char* msgHeader = _formatHeader();

    if (msgHeader == NULL) {
        delete [] msgHeader;
        printf("Failed to format message header\r\n");
        return (false);
    }
// start
    strcpy(buf, "MAIL FROM: <");
    strcat(buf, m_pcFromEmail);
    strcat(buf, ">\r\n");
    if (send(hSocket, (LPSTR)buf, strlen(buf), NO_FLAGS) == SOCKET_ERROR) {
        printf("Socket send error: %d\r\n", WSAGetLastError());    
        return (false);
    }
    iLength = recv(hSocket, (LPSTR)sReceiveBuffer+iEnd,sizeof(sReceiveBuffer)-iEnd, 
                   NO_FLAGS);
    iEnd += iLength;
    sReceiveBuffer[iEnd] = '\0';
// create message receipts
    char *token;
    for(unsigned int i=0;i<Recipients.size();i++) {
        token = strtok(Recipients.at(i)->GetEmail(),"<");
        token = strtok(NULL,"<");    
        if (token == NULL) 
            token = strtok(Recipients.at(i)->GetEmail(),"<");
        strcpy(buf, "RCPT TO: <");
        strcat(buf, token);
        strcat(buf, "\r\n");
        if (send(hSocket, (LPSTR)buf, strlen(buf), NO_FLAGS) == SOCKET_ERROR) {
            printf("Socket send error: %d\r\n", WSAGetLastError());    
            return (false);
        }
        iLength = recv(hSocket, 
                      (LPSTR)sReceiveBuffer+iEnd,sizeof(sReceiveBuffer)-iEnd, 
                       NO_FLAGS);
        iEnd += iLength;
        sReceiveBuffer[iEnd] = '\0';
    }
    for(unsigned int i=0;i<CCRecipients.size();i++) {
        token = strtok(CCRecipients.at(i)->GetEmail(),"<");
        token = strtok(NULL,"<");
        if (token == NULL) 
            token = strtok(Recipients.at(i)->GetEmail(),"<");
        strcpy(buf, "RCPT TO: <");
        strcat(buf, token);
        strcat(buf, "\r\n");
        if (send(hSocket, (LPSTR)buf, strlen(buf), NO_FLAGS) == SOCKET_ERROR) {
            printf("Socket send error: %d\r\n", WSAGetLastError());    
            return (false);
        }
        iLength = recv(hSocket, 
                       (LPSTR)sReceiveBuffer+iEnd,sizeof(sReceiveBuffer)-iEnd,
                        NO_FLAGS);
        iEnd += iLength;
        sReceiveBuffer[iEnd] = '\0';
    }
    for(unsigned int i=0;i<BCCRecipients.size();i++) {
        token = strtok(BCCRecipients.at(i)->GetEmail(),"<");
        token = strtok(NULL,"<");
        if (token == NULL) 
            token = strtok(Recipients.at(i)->GetEmail(),"<");
        strcpy(buf, "RCPT TO: <");
        strcat(buf, token);
        strcat(buf, "\r\n");
        if (send(hSocket, (LPSTR)buf, strlen(buf), NO_FLAGS) == SOCKET_ERROR) {
            printf("Socket send error: %d\r\n", WSAGetLastError());    
            return (false);
        }
        iLength = recv(hSocket, (LPSTR)sReceiveBuffer+iEnd,
                       sizeof(sReceiveBuffer)-iEnd, 
                       NO_FLAGS);
        iEnd += iLength;
        sReceiveBuffer[iEnd] = '\0';
    }
// init data
    if (send(hSocket, (LPSTR)"DATA\r\n", strlen("DATA\r\n"), NO_FLAGS) == SOCKET_ERROR) {
        printf("Socket send error: %d\r\n", WSAGetLastError());    
        return (false);
    }
    iLength = recv(hSocket, (LPSTR)sReceiveBuffer+iEnd,sizeof(sReceiveBuffer)-iEnd,
                   NO_FLAGS);
    iEnd += iLength;
    sReceiveBuffer[iEnd] = '\0';
// send header    
    if (send(hSocket, 
             (LPSTR)msgHeader, strlen(msgHeader), NO_FLAGS) == SOCKET_ERROR) {
        printf("Socket send error: %d\r\n", WSAGetLastError());    
        delete [] msgHeader;
        return (false);
    }
// send body    
    if (send(hSocket, 
             (LPSTR)m_pcMsgBody, strlen(m_pcMsgBody), NO_FLAGS) == SOCKET_ERROR) {
        printf("Socket send error: %d\r\n", WSAGetLastError());    
        return (false);
    }
// signal end    
    if (send(hSocket,
            (LPSTR)"\r\n.\r\n", strlen("\r\n.\r\n"), NO_FLAGS) == SOCKET_ERROR) {
        printf("Socket send error: %d\r\n", WSAGetLastError());    
        return (false);
    }
    iLength = recv(hSocket, (LPSTR)sReceiveBuffer+iEnd,sizeof(sReceiveBuffer)-iEnd,
                   NO_FLAGS);
    iEnd += iLength;
    sReceiveBuffer[iEnd] = '\0';
    delete [] msgHeader;
    return (true);

}

bool CFastSmtp::ConnectServer(const char server[], const unsigned short port)
{
    assert(server);

    if (bCon)
        Disconnect();
    bCon=false;
    hSocket = INVALID_SOCKET;

    hSocket = _connectServerSocket(server, port);    
    if (hSocket != INVALID_SOCKET) {        
        BYTE        sReceiveBuffer[4096];
        int            iLength = 0;
        int            iEnd = 0;
        char        buf[4096];
      
        strcpy(buf, "HELO ");
        strcat(buf, server);
        strcat(buf, "\r\n");
        if (send(hSocket, (LPSTR)buf, strlen(buf), NO_FLAGS) == SOCKET_ERROR) {
            printf("Socket send error: %d\r\n", WSAGetLastError());    
            return (false);
        }
        iLength = recv(hSocket, 
                       (LPSTR)sReceiveBuffer+iEnd,sizeof(sReceiveBuffer)-iEnd, 
                        NO_FLAGS);
        iEnd += iLength;
        sReceiveBuffer[iEnd] = '\0';
    } else {
        printf("Invalid socket\r\n");
        return (false);
    }

    bCon=true;
    return (true);
}

SOCKET CFastSmtp::_connectServerSocket(const char server[],
                                       const unsigned short port)
{
    int                nConnect;
    short            nProtocolPort;
    LPHOSTENT        lpHostEnt;
    LPSERVENT        lpServEnt;
    SOCKADDR_IN        sockAddr;        

    SOCKET            hServerSocket = INVALID_SOCKET;
     
    lpHostEnt = gethostbyname(server);
    if (lpHostEnt) {        
        hServerSocket = socket(PF_INET, SOCK_STREAM,DEFAULT_PROTOCOL);
        if (hServerSocket != INVALID_SOCKET) {
            if (port != NULL) {
                nProtocolPort = port;
            }else{
                lpServEnt = getservbyname("mail", DEFAULT_PROTOCOL);
                if (lpServEnt == NULL) 
                    nProtocolPort = htons(IPPORT_SMTP); 
                else 
                    nProtocolPort = lpServEnt->s_port;
            }
            sockAddr.sin_family = AF_INET;
            sockAddr.sin_port = nProtocolPort;
            sockAddr.sin_addr = *((LPIN_ADDR)*lpHostEnt->h_addr_list);
            nConnect = connect(hServerSocket, (PSOCKADDR)&sockAddr, 
                               sizeof(sockAddr));
            if(nConnect) 
                hServerSocket = INVALID_SOCKET;
        } else {
            printf("Invalid socket\r\n");
            throw;
        }
    }
    return(hServerSocket);
}

char* CFastSmtp::_formatHeader()
{
// check for at least one recipient
    if(Recipients.size() <= 0 )    {
        printf("Please add a message recipient!\r\n");
        return NULL;
    }
    int s=0;
    char *msgHeader = new char[16385];
    //char to[1024];
    for (unsigned int i=s=0;i<Recipients.size();i++) {        
        s+=strlen(Recipients.at(i)->GetEmail())+1;
    } if (s==0) s=1; char *to = new char[s];
    //char cc[1024];
    for (i=s=0;i<CCRecipients.size();i++) {        
        s+=strlen(CCRecipients.at(i)->GetEmail())+1;
    } if (s==0) s=1; char *cc = new char[s];
    //char bcc[1024];
    for (i=s=0;i<BCCRecipients.size();i++) {        
        s+=strlen(BCCRecipients.at(i)->GetEmail())+1;
    } if (s==0) s=1; char *bcc = new char[s];

    TCHAR szDate[500];
    TCHAR sztTime[500];

// create the recipient string, cc string, and bcc string
    to[0] = '\0';        
    for (i=0;i<Recipients.size();i++) {        
        i > 0 ? strcat(to,","):strcat(to,"");
        strcat(to,Recipients.at(i)->GetEmail());
    }

    cc[0] = '\0';    
    for (i=0;i<CCRecipients.size();i++) {
        i > 0 ? strcat(cc,","):strcat(cc,"");
        strcat(cc,CCRecipients.at(i)->GetEmail());
    }

    bcc[0] = '\0';    
    for (i=0;i<BCCRecipients.size();i++) {
        i > 0 ? strcat(bcc,","):strcat(bcc,"");
        strcat(bcc,BCCRecipients.at(i)->GetEmail());
    }
// get the current date and time
    SYSTEMTIME st={0};
    ::GetSystemTime(&st);
    ::GetDateFormat(LOCALE_SYSTEM_DEFAULT,0,&st,"ddd',
                    ' dd MMM yyyy",szDate,sizeof(szDate));
    ::GetTimeFormat(LOCALE_SYSTEM_DEFAULT,TIME_FORCE24HOURFORMAT,&st,
                    "HH':'mm':'ss tt",sztTime,sizeof(sztTime));
// here it is...the main data of the message
    wsprintf(msgHeader,"DATE: %s %s\r\n", szDate, sztTime);    
    if (m_pcFromName != NULL) {
        strcat(msgHeader,"FROM: ");
        strcat(msgHeader, m_pcFromName);
        strcat(msgHeader, "\r\n");
    }
    strcat(msgHeader,"To: ");
    strcat(msgHeader, to);
    strcat(msgHeader, "\r\n");
    strcat(msgHeader,"Cc: ");
    strcat(msgHeader, cc);
    strcat(msgHeader, "\r\n");
    if (m_pcSubject != NULL) {
        strcat(msgHeader, "Subject: ");
        strcat(msgHeader, m_pcSubject);
        strcat(msgHeader, "\r\n");
    }
    if (m_pcXMailer != NULL) {
        strcat(msgHeader,"X-Mailer: ");
        strcat(msgHeader, m_pcXMailer);
        strcat(msgHeader, "\r\n");
    }
// start optional fields
    if (m_pcReplyTo != NULL) {
        strcat(msgHeader, "Reply-To: ");
        strcat(msgHeader, m_pcReplyTo);
        strcat(msgHeader, "\r\n");
    }
// start MIME versions
    strcat(msgHeader, 
           "MIME-Version: 1.0\r\nContent-type: text/plain; charset=US-ASCII\r\n");
// send header finish command
    strcat(msgHeader, "\r\n");    
// clean up
    delete to;
    delete cc;
    delete bcc;
// done    
    return msgHeader;    
}

const char* const CFastSmtp::GetLocalHostIp() 
{
    in_addr    *iaHost;
    
    if (gethostname(m_cHostName,255) != SOCKET_ERROR) {
        HOSTENT *pHe = NULL;        
        pHe = gethostbyname(m_cHostName);
        if (pHe != NULL) {
            for (int i=0;pHe->h_addr_list[i] != 0;i++) {
                iaHost = (LPIN_ADDR)pHe->h_addr_list[i];
                m_pcIPAddr = inet_ntoa(*iaHost);
            }
        }            
    } else {            
        DWORD dErr = WSAGetLastError();    
        printf("Failed to get the local ip address\r\n");
    }    

    return m_pcIPAddr;
}

const char* const CFastSmtp::GetLocalHostname() 
{    
    if (gethostname((char FAR*)m_cHostName,255) == SOCKET_ERROR)    
        printf("Failed to get the local hostname\r\n");
    return m_cHostName;
}


//**********************************************************************************
//*** Properties
//**********************************************************************************

bool CFastSmtp::GetConnectStatus()
{
    return (bCon);
}

unsigned const int CFastSmtp::GetBCCRecipientCount()
{
    return (BCCRecipients.size());
}

unsigned const int CFastSmtp::GetCCRecipientCount() 
{
    return (CCRecipients.size());
}

unsigned const int CFastSmtp::GetSocket()
{
    return (hSocket);
}

const char* const CFastSmtp::GetMessageBody() 
{
    return (m_pcMsgBody);
}

unsigned const int CFastSmtp::GetRecipientCount()
{
    return (Recipients.size());
}

const char* const CFastSmtp::GetReplyTo()  
{
    return (m_pcReplyTo);
}

const char* const CFastSmtp::GetSenderEmail() 
{
    return (m_pcFromEmail);
}

const char* const CFastSmtp::GetSenderName() 
{
    return (m_pcFromName);
}

const char* const CFastSmtp::GetSubject() 
{
    return (m_pcSubject);
}

const char* const CFastSmtp::GetXMailer() 
{
    return (m_pcXMailer);
}

void CFastSmtp::SetMessageBody(const char body[])
{
    assert(body);
    int s=strlen(body);
    if (m_pcMsgBody)
        delete [] m_pcMsgBody;
    m_pcMsgBody = new char[s+1];
    strcpy(m_pcMsgBody, body);    
}

void CFastSmtp::SetReplyTo(const char replyto[])
{
    assert(replyto);
    int s=strlen(replyto);
    if (m_pcReplyTo)
        delete [] m_pcReplyTo;
    m_pcReplyTo = new char[s+1];
    strcpy(m_pcReplyTo, replyto);
}

void CFastSmtp::SetSenderEmail(const char email[])
{
    assert(email);
    int s=strlen(email);
    if (m_pcFromEmail)
        delete [] m_pcFromEmail;
    m_pcFromEmail = new char[s+1];
    strcpy(m_pcFromEmail, email);        
}

void CFastSmtp::SetSenderName(const char name[])
{
    assert(name);
    int s=strlen(name);
    if (m_pcFromName)
        delete [] m_pcFromName;
    m_pcFromName = new char[s+1];
    strcpy(m_pcFromName, name);
}

void CFastSmtp::SetSubject(const char subject[])
{
    assert(subject);
    int s=strlen(subject);
    if (m_pcSubject)
        delete [] m_pcSubject;
    m_pcSubject = new char[s+1];
    strcpy(m_pcSubject, subject);
}

void CFastSmtp::SetXMailer(const char xmailer[])
{
    assert(xmailer);
    int s=strlen(xmailer);
    if (m_pcXMailer)
        delete [] m_pcXMailer;
    m_pcXMailer = new char[s+1];
    strcpy(m_pcXMailer, xmailer);
}

Here is the header (FastSmtp.h):

// CFastSmtp.h: interface for the Smtp class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_SMTP_H__C66CDD0A_4F6F_4465_BAD6_8FA531785B5D__INCLUDED_)
#define AFX_SMTP_H__C66CDD0A_4F6F_4465_BAD6_8FA531785B5D__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <winsock2.h>
#include <assert.h>
#include <vector>

const int DEFAULT_PROTOCOL = 0;
const int NO_FLAGS = 0;

class CFastSmtp  
{
public:        
    CFastSmtp();    
    virtual ~CFastSmtp();
    bool    AddRecipient(const char email[], const char name[]="");
    bool    AddBCCRecipient(const char email[], const char name[]="");
    bool    AddCCRecipient(const char email[], const char name[]="");    
    bool    ConnectServer(const char server[], const unsigned short port=NULL);
    bool    Disconnect();
    bool    GetConnectStatus();    
    const unsigned int    GetBCCRecipientCount();    
    const unsigned int    GetCCRecipientCount();
    const unsigned int    GetRecipientCount();    
    const unsigned int    GetSocket();
    const char*    const    GetLocalHostIp();
    const char*    const    GetLocalHostname();    
    const char*    const    GetMessageBody();    
    const char*    const    GetReplyTo();
    const char*    const    GetSenderEmail();
    const char*    const    GetSenderName();
    const char*    const    GetSubject();    
    const char*    const    GetXMailer();    
    bool    Send();
    void    SetMessageBody(const char body[]);    
    void    SetSubject(const char subject[]);    
    void    SetSenderName(const char name[]);    
    void    SetSenderEmail(const char email[]);    
    void    SetReplyTo(const char replyto[]);    
    void    SetXMailer(const char xmailer[]);

private:
    class CRecipient
    {
    public:
        CRecipient() 
        { 
            m_pcEmail = NULL;
        };
        CRecipient& operator=(const CRecipient& src)
        {
            if (&src != this)
            {
                if (m_pcEmail)
                    delete [] m_pcEmail;
                int s = strlen(src.m_pcEmail);
                m_pcEmail = new char[s+1];
                strcpy(m_pcEmail, src.m_pcEmail);
            }
            return (*this);
        };
        virtual ~CRecipient()
        {
            if (m_pcEmail)
                delete [] m_pcEmail;
        };
        char* GetEmail()
        {
            return m_pcEmail;
        };
        void SetEmail(const char email[])
        {
            assert(email);
            int s=strlen(email);
            if (s > 0)
            {
                m_pcEmail = new char[s+1];
                strcpy(m_pcEmail, email);
            }        
        };
    private:
        char *m_pcEmail;
    };
    bool bCon;
    char m_cHostName[MAX_PATH];
    char* m_pcFromEmail;
    char* m_pcFromName;
    char* m_pcSubject;
    char* m_pcMsgBody;
    char* m_pcXMailer;
    char* m_pcReplyTo;
    char* m_pcIPAddr;    

    WSADATA wsaData;
    SOCKET hSocket;

    std::vector<CRecipient*> Recipients;
    std::vector<CRecipient*> CCRecipients;
    std::vector<CRecipient*> BCCRecipients;    
    
    char*   _formatHeader();    
    bool    _formatMessage();
    SOCKET  _connectServerSocket(const char* server, const unsigned short port=NULL);    
};

#endif // !defined(AFX_SMTP_H__C66CDD0A_4F6F_4465_BAD6_8FA531785B5D__INCLUDED_)