/// <summary>
/// Default constructor.
/// </summary>
/// <param name="session">Owner SMTP server session.</param>
/// <param name="from">MAIL FROM: value.</param>
/// <param name="reply">SMTP server reply.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>session</b>, <b>from</b> or <b>reply</b> is null reference.</exception>
public SMTP_e_MailFrom(SMTP_Session session,SMTP_MailFrom from,SMTP_Reply reply)
{
if(session == null){
throw new ArgumentNullException("session");
}
if(from == null){
throw new ArgumentNullException("from");
}
if(reply == null){
throw new ArgumentNullException("reply");
}
m_pSession = session;
m_pMailFrom = from;
m_pReply = reply;
}
/// <summary>
/// Cleans up any resource being used.
/// </summary>
public override void Dispose()
{
if(this.IsDisposed){
return;
}
base.Dispose();
m_pAuthentications = null;
m_EhloHost = null;
m_pUser = null;
m_pFrom = null;
m_pTo = null;
if(m_pMessageStream != null){
m_pMessageStream.Dispose();
m_pMessageStream = null;
}
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="session">Owner SMTP server session.</param>
/// <param name="from">MAIL FROM: value.</param>
/// <param name="reply">SMTP server reply.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>session</b>, <b>from</b> or <b>reply</b> is null reference.</exception>
public SMTP_e_MailFrom(SMTP_Session session, SMTP_MailFrom from, SMTP_Reply reply)
{
if (session == null)
{
throw new ArgumentNullException("session");
}
if (from == null)
{
throw new ArgumentNullException("from");
}
if (reply == null)
{
throw new ArgumentNullException("reply");
}
m_pSession = session;
m_pMailFrom = from;
m_pReply = reply;
}
/// <summary>
/// Raises <b>MailFrom</b> event.
/// </summary>
/// <param name="from">MAIL FROM: value.</param>
/// <param name="reply">Default SMTP server reply.</param>
/// <returns>Returns SMTP server reply what must be sent to the connected client.</returns>
private SMTP_Reply OnMailFrom(SMTP_MailFrom from,SMTP_Reply reply)
{
if(this.MailFrom != null){
SMTP_e_MailFrom eArgs = new SMTP_e_MailFrom(this,from,reply);
this.MailFrom(this,eArgs);
return eArgs.Reply;
}
return reply;
}
/// <summary>
/// Does reset as specified in RFC 5321.
/// </summary>
private void Reset()
{
if(this.IsDisposed){
return;
}
m_pFrom = null;
m_pTo.Clear();
m_pMessageStream = null;
m_BDatReadedCount = 0;
}
private void MAIL(string cmdText)
{
// RFC 5321 3.1.
if(m_SessionRejected){
WriteLine("503 bad sequence of commands: Session rejected.");
return;
}
// RFC 5321 4.1.4.
if(string.IsNullOrEmpty(m_EhloHost)){
WriteLine("503 Bad sequence of commands: send EHLO/HELO first.");
return;
}
// RFC 5321 4.1.4.
if(m_pFrom != null){
WriteLine("503 Bad sequence of commands: nested MAIL command.");
return;
}
// RFC 3030 BDAT.
if(m_pMessageStream != null){
WriteLine("503 Bad sequence of commands: BDAT command is pending.");
return;
}
if(this.Server.MaxTransactions != 0 && m_Transactions >= this.Server.MaxTransactions){
WriteLine("503 Bad sequence of commands: Maximum allowed mail transactions exceeded.");
return;
}
/* RFC 5321 4.1.1.2.
mail = "MAIL FROM:" Reverse-path [SP Mail-parameters] CRLF
Mail-parameters = esmtp-param *(SP esmtp-param)
esmtp-param = esmtp-keyword ["=" esmtp-value]
esmtp-keyword = (ALPHA / DIGIT) *(ALPHA / DIGIT / "-")
esmtp-value = 1*(%d33-60 / %d62-126)
; any CHAR excluding "=", SP, and control
; characters. If this string is an email address,
; i.e., a Mailbox, then the "xtext" syntax [32] SHOULD be used.
Reverse-path = Path / "<>"
Path = "<" [ A-d-l ":" ] Mailbox ">"
4.1.1.11.
If the server SMTP does not recognize or cannot implement one or more
of the parameters associated with a particular MAIL FROM or RCPT TO
command, it will return code 555.
*/
if(cmdText.ToUpper().StartsWith("FROM:")){
// Remove FROM: from command text.
cmdText = cmdText.Substring(5).Trim();
}
else{
WriteLine("501 Syntax error, syntax: \"MAIL FROM:\" \"<\" address \">\" / \"<>\" [SP Mail-parameters] CRLF");
return;
}
string address = "";
int size = -1;
string body = null;
SMTP_DSN_Ret ret = SMTP_DSN_Ret.NotSpecified;
string envID = null;
// Mailbox not between <>.
if(!cmdText.StartsWith("<") || cmdText.IndexOf('>') == -1){
WriteLine("501 Syntax error, syntax: \"MAIL FROM:\" \"<\" address \">\" / \"<>\" [SP Mail-parameters] CRLF");
return;
}
// Parse mailbox.
else{
address = cmdText.Substring(1,cmdText.IndexOf('>') - 1).Trim();
cmdText = cmdText.Substring(cmdText.IndexOf('>') + 1).Trim();
}
#region Parse parameters
string[] parameters = string.IsNullOrEmpty(cmdText) ? new string[0] : cmdText.Split(' ');
foreach(string parameter in parameters){
string[] name_value = parameter.Split(new char[]{'='},2);
// SIZE
if(this.Server.Extentions.Contains(SMTP_ServiceExtensions.SIZE) && name_value[0].ToUpper() == "SIZE"){
// RFC 1870.
// size-value ::= 1*20DIGIT
if(name_value.Length == 1){
WriteLine("501 Syntax error: SIZE parameter value must be specified.");
return;
}
if(!int.TryParse(name_value[1],out size)){
WriteLine("501 Syntax error: SIZE parameter value must be integer.");
return;
}
// Message size exceeds maximum allowed message size.
if(size > this.Server.MaxMessageSize){
WriteLine("552 Message exceeds fixed maximum message size.");
return;
}
}
// BODY
else if(this.Server.Extentions.Contains(SMTP_ServiceExtensions._8BITMIME) && name_value[0].ToUpper() == "BODY"){
// RFC 1652.
// body-value ::= "7BIT" / "8BITMIME" / "BINARYMIME"
//
// BINARYMIME - defined in RFC 3030.
if(name_value.Length == 1){
WriteLine("501 Syntax error: BODY parameter value must be specified.");
return;
}
if(name_value[1].ToUpper() != "7BIT" && name_value[1].ToUpper() != "8BITMIME" && name_value[1].ToUpper() != "BINARYMIME"){
WriteLine("501 Syntax error: BODY parameter value must be \"7BIT\",\"8BITMIME\" or \"BINARYMIME\".");
return;
}
body = name_value[1].ToUpper();
}
// RET
else if(this.Server.Extentions.Contains(SMTP_ServiceExtensions.DSN) && name_value[0].ToUpper() == "RET"){
// RFC 3461 4.3.
// ret-value = "FULL" / "HDRS"
if(name_value.Length == 1){
WriteLine("501 Syntax error: RET parameter value must be specified.");
return;
}
else if(name_value[1].ToUpper() != "FULL"){
ret = SMTP_DSN_Ret.FullMessage;
}
else if(name_value[1].ToUpper() != "HDRS"){
ret = SMTP_DSN_Ret.Headers;
}
else{
WriteLine("501 Syntax error: RET parameter value must be \"FULL\" or \"HDRS\".");
return;
}
}
// ENVID
else if(this.Server.Extentions.Contains(SMTP_ServiceExtensions.DSN) && name_value[0].ToUpper() == "ENVID"){
// RFC 3461 4.4.
// envid-parameter = "ENVID=" xtext
if(name_value.Length == 1){
WriteLine("501 Syntax error: ENVID parameter value must be specified.");
return;
}
envID = name_value[1].ToUpper();
}
// AUTH
else if(name_value[0].ToUpper() == "AUTH"){
}
// Unsupported parameter.
else{
WriteLine("555 Unsupported parameter: " + parameter);
return;
}
}
#endregion
SMTP_MailFrom from = new SMTP_MailFrom(address,size,body,ret,envID);
SMTP_Reply reply = new SMTP_Reply(250,"OK.");
reply = OnMailFrom(from,reply);
// MAIL accepted.
if(reply.ReplyCode < 300){
m_pFrom = from;
m_Transactions++;
}
WriteLine(reply.ToString());
}