public override async Task ExecuteAsync(CancellationToken token)
{
if (string.IsNullOrEmpty(_builder.PendingMail?.FromPath?.Mailbox) ||
_builder.PendingMail?.Recipents?.Count == 0 ||
_builder.PendingMail?.IsBinary != true)
{
await _session.SendReplyAsync(SmtpReplyCode.BadSequence, "Bad sequence", token);
return;
}
string[] parts = Arguments?.Split(' ');
if (parts == null || parts.Length == 0 || parts.Length > 2)
{
await _session.SendReplyAsync(SmtpReplyCode.InvalidArguments, "Length required, optional LAST", token);
return;
}
if (!int.TryParse(parts[0], out int length) || length < 1)
{
await _session.SendReplyAsync(SmtpReplyCode.InvalidArguments, "Length must be positive integer", token);
return;
}
var last = false;
if (parts.Length == 2)
{
if (!string.Equals("LAST", parts[1], StringComparison.OrdinalIgnoreCase))
{
await _session.SendReplyAsync(SmtpReplyCode.InvalidArguments, "LAST expected", token);
return;
}
last = true;
}
using (IMailWriteReference mailReference = await _mailQueue.NewMailAsync(
_builder.PendingMail.FromPath.Mailbox,
_builder.PendingMail.Recipents.ToImmutableList(),
token))
{
using (Stream mailStream = mailReference.BodyStream)
{
var chunk = new byte[1000];
var totalRead = 0;
do
{
int toRead = Math.Min(chunk.Length, length - totalRead);
int read = await _connection.ReadBytesAsync(chunk, 0, toRead, token);
totalRead += read;
await mailStream.WriteAsync(chunk, 0, read, token);
} while (totalRead < length);
}
await _mailQueue.SaveAsync(mailReference, token);
}
await _session.SendReplyAsync(SmtpReplyCode.Okay, $"Recieved {length} octets", token);
if (last)
{
_builder.PendingMail = null;
await _session.SendReplyAsync(SmtpReplyCode.Okay, "Message complete", token);
}
}
public override async Task ExecuteAsync(CancellationToken token)
{
if (string.IsNullOrEmpty(_builder.PendingMail?.FromPath?.Mailbox) ||
_builder.PendingMail?.Recipents?.Count == 0 ||
_builder.PendingMail?.IsBinary == true)
{
await _channel.SendReplyAsync(SmtpReplyCode.BadSequence, "Bad sequence", token);
return;
}
await _channel.SendReplyAsync(SmtpReplyCode.StartMail, "Send data, end with .<CR><LF>", token);
var rejected = false;
using (IMailWriteReference reference = await _mailQueue.NewMailAsync(
_builder.PendingMail.FromPath.Mailbox,
_builder.PendingMail.Recipents.ToImmutableList(),
token))
{
using (var mailWriter = new StreamWriter(reference.BodyStream, new UTF8Encoding(false)))
{
await mailWriter.WriteLineAsync(
$"Received: FROM {_channel.ConnectedHost} ({_connectionInformation.RemoteAddress}) BY {_settings.DomainName} ({_connectionInformation.LocalAddress}); {DateTime.UtcNow:ddd, dd MMM yyy HH:mm:ss zzzz}");
string line;
while ((line = await _reader.ReadLineAsync(Encoding.UTF8, token)) != ".")
{
if (!rejected &&
!_channel.IsAuthenticated &&
_settings.UnauthenticatedMessageSizeLimit != 0 &&
_settings.UnauthenticatedMessageSizeLimit <= mailWriter.BaseStream.Length)
{
await _channel.SendReplyAsync(SmtpReplyCode.ExceededQuota, "Message rejected, too large", token);
mailWriter.Dispose();
reference.Dispose();
rejected = true;
}
if (rejected)
{
continue;
}
await mailWriter.WriteLineAsync(line);
await mailWriter.FlushAsync();
}
}
if (!rejected)
{
await _mailQueue.SaveAsync(reference, token);
}
}
_builder.PendingMail = null;
if (!rejected)
{
await _channel.SendReplyAsync(SmtpReplyCode.Okay, "OK", token);
}
}