Develop Reference

Mailkit is sending emails with the incorrect from address

I've written a mail method and I'm setting the from email address but when the customer receives it, it's the same as the username that is used to authenticate the email.
I've tried to set the email right before the send and it still comes out wrong:
When I check the message, as shown above, the from is correct but the customer receives it from the username field instead.
public static EmailResults SendEmail(EmailSettings emailSettings)
{
var emailResults = new EmailResults();
try
{
// using mimekit that the msdn smtpclient webpage suggested using
// http://www.mimekit.net/docs/html/Introduction.htm
if (emailSettings.TestModeEnabled)
{
emailResults.IsSuccessful = true;
emailResults.Message = "SendEmail disabled due to TestModeEnabled being set to true.";
return emailResults;
}
// use the mimemessage to create the message to send
var message = new MimeMessage();
message.From.Add(emailSettings.FromEmail);
message.Subject = emailSettings.EmailSubject;
// to email has the option for multiple emails to be sent to
// loop through them and add them all to the message
foreach (var mailboxAddress in emailSettings.ToEmail)
{
message.To.Add(mailboxAddress);
}
// attach file if present
var builder = new BodyBuilder();
if (emailSettings.FileAttachments != null)
{
foreach (var file in emailSettings.FileAttachments)
{
if (File.Exists(file))
{
builder.Attachments.Add(file);
}
}
}
builder.HtmlBody = emailSettings.EmailBody;
message.Body = builder.ToMessageBody();
//// http://www.mimekit.net/docs/html/Creating-Messages.htm
//// A TextPart is a leaf-node MIME part with a text media-type. The first argument to the
//// TextPart constructor specifies the media-subtype, in this case, plain. Another media
//// subtype you are probably familiar with is the html subtype. Some other examples
//// include enriched, rtf, and xml.
//message.Body = new TextPart("html")
//{
// Text = emailSettings.EmailBody
//};
// bcc has the option for multiple emails to be sent to
// loop through them and add them all to the message
if (emailSettings.BccEmail != null)
{
foreach (var mailboxAddress in emailSettings.BccEmail)
{
message.Bcc.Add(mailboxAddress);
}
}
// *************** SEND EMAIL *******************
var client = emailSettings.EnableSmtpLog ? new MailKit.Net.Smtp.SmtpClient(new ProtocolLogger(GlobalVariables.SmptpLogFile)) : new MailKit.Net.Smtp.SmtpClient();
using (client)
{
if (emailSettings.SmtpServer.Contains("gmail.com"))
{
// Note: since we don't have an OAuth2 token, disable
// the XOAUTH2 authentication mechanism.
client.AuthenticationMechanisms.Remove("XOAUTH2");
}
client.SslProtocols = System.Security.Authentication.SslProtocols.Tls12;
//accept all SSL certificates
client.ServerCertificateValidationCallback = (s, c, h, e) => true;
// client.Connect(emailSettings.SmtpServer, emailSettings.SmtpPort, emailSettings.IsSslEnabled);
client.Connect(emailSettings.SmtpServer, emailSettings.SmtpPort, emailSettings.AuthType);
if (emailSettings.IsAuthenticationRequired)
{
// Note: only needed if the SMTP server requires authentication
client.Authenticate(emailSettings.SmtpUsername, emailSettings.SmtpPassword);
}
if (emailSettings.TimeOut == 0) emailSettings.TimeOut = 10;
client.Timeout = emailSettings.TimeOut * 1000;
//message.From.Add(new MailboxAddress("someone#somewhere.net"));
client.Send(message);
client.Disconnect(true);
}
// if we reached this far, then the email was sent successfully
emailResults.Message = "Successfully sent.";
emailResults.IsSuccessful = true;
return emailResults;
}
catch (AuthenticationException e)
{
Logging.LogException("SmtpClient.SendEmail", "Error attempting to send email.", e);
emailResults.IsSuccessful = false;
emailResults.Message = "Invalid username or password.";
return emailResults;
}
catch (Exception e)
{
Logging.LogException("SmtpClient.SendEmail", "Error attempting to send email.", e);
emailResults.IsSuccessful = false;
if (e.Message.Contains("error occurred while attempting to establish an SSL or TLS connection"))
{
emailResults.Message = "An error occurred while attempting to establish a secure connection.\r\n\r\nPlease check your email settings.";
}
else
{
emailResults.Message = e.Message;
}
return emailResults;
}
}
Anyone have any suggestions on what I'm doing wrong?

For anyone who runs in to this again...
This particular issue is specific to Gmail. I'm not sure if other email hosts do the same.
If you are setting the from email address to "person1#email.com" but authenticating with "person2#gmail.com", Gmail will override the from email address with the authentication email address. You have no control over this.

Go to the Gmail account, into settings, and add the alias address in the "Send Mail As" section. The outgoing email should now display with the alias address rather than the authenticating address.

gmail api returning null for a specific history id. History id received from Cloud Pub/Sub push subscription

From Cloud pub/sub push service i got a history id. Using that history id i am trying to read the recent mail's but It returns null.
I have configured cloud pub/sub push subscription and add a watch to "Unread" label.
Scenario 1:
I have received a push notification. From that push notification i have taken history id to get the recent messages. it's returning me null value.
Scenario 2:
I have logged into that configured mail id and then the message loaded in inbox. After that if i try to read i am getting the history list.
static string[] Scopes = { GmailService.Scope.MailGoogleCom };
static void Main(string[] args)
{
string UserId = "####.gmail.com";
UserCredential credential;
using (var stream =
new FileStream("client_secret_#####.json", FileMode.Open, FileAccess.Read))
{
string credPath = "token.json";
credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(stream).Secrets,
Scopes,
UserId,
CancellationToken.None,
new FileDataStore(credPath, true)).Result;
Console.WriteLine("Credential file saved to: " + credPath);
}
var service = new GmailService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = ApplicationName,
});
List<History> result = new List<History>();
UsersResource.HistoryResource.ListRequest request = service.Users.History.List(UserId);
//history id received from cloud pub/sub push subscription.
request.StartHistoryId = Convert.ToUInt64("269871");
do
{
try
{
ListHistoryResponse response = request.Execute();
if (response.History != null)
{
result.AddRange(response.History);
}
request.PageToken = response.NextPageToken;
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
}
} while (!String.IsNullOrEmpty(request.PageToken));
foreach (var vHistory in result)
{
foreach (var vMsg in vHistory.Messages)
{
string date = string.Empty;
string from = string.Empty;
string subject = string.Empty;
string body = string.Empty;
var emailInfoRequest = service.Users.Messages.Get(UserId, vMsg.Id);
var emailInfoResponse = emailInfoRequest.Execute();
if(emailInfoResponse!= null)
{
foreach (var mParts in emailInfoResponse.Payload.Headers)
{
if (mParts.Name == "Date")
{
date = mParts.Value;
}
else if (mParts.Name == "From")
{
from = mParts.Value;
}
else if (mParts.Name == "Subject")
{
subject = mParts.Value;
}
if (date != "" && from != "")
{
if (emailInfoResponse.Payload.Parts != null)
{
foreach (MessagePart p in emailInfoResponse.Payload.Parts)
{
if (p.MimeType == "text/html")
{
byte[] data = FromBase64ForUrlString(p.Body.Data);
body = Encoding.UTF8.GetString(data);
}
else if(p.Filename!=null && p.Filename.Length>0)
{
string attId = p.Body.AttachmentId;
string outputDir = #"D:\#####\";
MessagePartBody attachPart = service.Users.Messages.Attachments.Get(UserId, vMsg.Id, attId).Execute();
String attachData = attachPart.Data.Replace('-', '+');
attachData = attachData.Replace('_', '/');
byte[] data = Convert.FromBase64String(attachData);
File.WriteAllBytes(Path.Combine(outputDir, p.Filename), data);
}
}
}
else
{
byte[] data = FromBase64ForUrlString(emailInfoResponse.Payload.Body.Data);
body = Encoding.UTF8.GetString(data);
}
}
}
}
}
}
public static byte[] FromBase64ForUrlString(string base64ForUrlInput)
{
int padChars = (base64ForUrlInput.Length % 4) == 0 ? 0 : (4 - (base64ForUrlInput.Length % 4));
StringBuilder result = new StringBuilder(base64ForUrlInput, base64ForUrlInput.Length + padChars);
result.Append(String.Empty.PadRight(padChars, '='));
result.Replace('-', '+');
result.Replace('_', '/');
return Convert.FromBase64String(result.ToString());
}
}
Please let me know how to read the full message using history id. when i receive push notification.

The Gmail Api documentation states that the Users.history:list method requires startHistoryId as a parameter to be executed, rather than giving you this parameter as a response. This is confusing, since it states as an optional parameter, but it is also specifies that it is required. The documentation also specifies:
The supplied startHistoryId should be obtained from the historyId of a
message, thread, or previous list response.
I suggest you to test the methods you use first with "Try this API" and OAuth 2.0 Playground. This makes it easier to understand which parameters you need to supply and which responses you can obtain from each method.

I have dealt with this. The point is that the history_id you are receiving is to be interpreted like the "latest moment when something happened". So, in order to make this work, you MUST use a history_id coming from a previous execution (that, don't forget, in GMail Push API means that you have to implement the initial full sync, or at the very least you should be executing a second run of your partial sync), which will return the events that span from the previous history_id to the one you just received.
I have just published an article on medium, since the detail of the history_id, in my opinion, can be a little sneaky. Article is here.

Trouble with sockets

I need make client-server game with 2 players. I bind client sockets on localhost and different ports. For connection clients send serialized msg with enum header and theirs IPEndPoints as value. When server receives connection messages from different clients, they are having same ports. How to fix it?
Method which receives connections:
public static void GetConnections()
{
while (true)
{
Console.WriteLine("Waiting for connections...");
var len = ServerSocket.Receive(TempData);
var msg = (NetMessage)DataSerializer.Deserialize(TempData);
Console.WriteLine(msg.Data.ToString());
if (msg.PacketType == PacketType.CONNECT)
{
String[] IP = msg.Data.ToString().Split(':');
if (Player1IP == null)
{
Player1IP = new IPEndPoint(IPAddress.Parse(IP[0]), Int32.Parse(IP[1]));
Console.WriteLine("Approved connection of player 1 with remote endpoint: " + Player1IP);
}
else if (Player2IP == null)
{
Player2IP = new IPEndPoint(IPAddress.Parse(IP[0]), Int32.Parse(IP[1]));
Console.WriteLine("Approved connection of player 2 with remote endpoint: " + Player2IP);
}
if (Player1IP != null && Player2IP != null)
{
Console.WriteLine("Both player are connected");
Console.WriteLine(Player1IP + " " + Player2IP);
return;
}
}
}
Connection method(runs once):
public void GetConnection()
{
NetMessage msg = new NetMessage(PacketType.CONNECT, ClientSocket.LocalEndPoint.ToString());
var bytes = DataSerializer.Serialize(msg);
ClientSocket.SendTo(bytes, ServerIP);
BeganConnection = true;
}

Mailkit: Sending Drafts

Im trying to find a method in mailkit that executes the command "Execute append" in IMAP, in C# i would do it like:
MailMessage mg = null;
using (ImapClient cl = new ImapClient("imap.gmail.com"))
{
cl.Port = 993;
cl.Ssl = true;
cl.UserName = "xxxxx";
cl.Password = "yyyyy";
var bl = cl.Authenticate();
if (bl == true)
{
//Add Draft
var smg = new SmtpMessage("xxx#gmail.com", "yyy#hotmail.com","yyy#hotmail.com", "This is a test mail.", "Hi.Is it correct??");
cl.ExecuteAppend("GMail/Drafts", smg.GetDataText(), "\\Draft",DateTimeOffset.Now);
}
}
However observing MailKit ImapClient, i dont have this option..
How can i execute append in MailKit IMAP?

After some hours searching....
using (var client = new ImapClient())
{
try
{
client.Connect(ConfigurationManager.AppSettings["ImapServer"], int.Parse(ConfigurationManager.AppSettings["ImapPort"]), SecureSocketOptions.Auto);
// Note: since we don't have an OAuth2 token, disable
// the XOAUTH2 authentication mechanism.
client.AuthenticationMechanisms.Remove("XOAUTH2");
// MailKit uses by default ntlm authentication
client.Authenticate("username", "password");
var draftFolder = client.GetFolder(SpecialFolder.Drafts);
if (draftFolder != null)
{
draftFolder.Open(FolderAccess.ReadWrite);
draftFolder.Append(message, MessageFlags.Draft);
draftFolder.Expunge();
}
else
{
var toplevel = client.GetFolder(client.PersonalNamespaces[0]);
var DraftFolder = toplevel.Create(SpecialFolder.Drafts.ToString(), true);
DraftFolder.Open(FolderAccess.ReadWrite);
DraftFolder.Append(message, MessageFlags.Draft);
DraftFolder.Expunge();
}
}
catch (Exception ex)
{
throw new ApplicationException("IMAPException has occured: " + ex.Message);
}
client.Disconnect(true);
}

Issue viewing all skinny traffic using pcap.net in a C# Winform application

I am using the latest version of pcap.net to capture network traffic on my local pc ethernet card. I am using the following code to capture all traffic associated with a specific mac address.
private void bwCapture_DoWork(object sender, DoWorkEventArgs e)
{
capture = true;
IList<LivePacketDevice> allDevices = LivePacketDevice.AllLocalMachine;
if (allDevices.Count == 0)
{
MessageBox.Show("No interfaces found!");
return;
}
if (capture)
{
// Print the list
for (int i = 0; i != allDevices.Count; ++i)
{
LivePacketDevice device = allDevices[i];
this.BeginInvoke((Action)delegate () { cmbNetworkDevice.Items.Add((i + 1) + ". " + device.Name); });
}
// Take the selected adapter
PacketDevice selectedDevice = allDevices[deviceSelected];
// Open the device
using (PacketCommunicator communicator = selectedDevice.Open(65536, // portion of the packet to capture
PacketDeviceOpenAttributes.Promiscuous, // promiscuous mode
50)) // read timeout
{
this.BeginInvoke((Action)delegate () { rtbCaptured.Text = "Listening on " + selectedDevice.Description + Environment.NewLine; });
// Retrieve the packets
Packet packet;
while (capture)
{
try
{
BerkeleyPacketFilter filter = communicator.CreateFilter("ether host <<MAC ADDRESS>> and tcp port 2000");
communicator.SetFilter(filter);
PacketCommunicatorReceiveResult result = communicator.ReceivePacket(out packet);
switch (result)
{
case PacketCommunicatorReceiveResult.Timeout:
// Timeout elapsed
continue;
case PacketCommunicatorReceiveResult.Ok:
this.BeginInvoke((Action)delegate ()
{
IpV4Datagram ip = packet.Ethernet.IpV4;
TcpDatagram tcp = ip.Tcp;
if (tcp != null && ip != null)
{
string IPCheck = ip.Source.ToString();
int PortCheck = tcp.DestinationPort;
dgvIncomingPackets.Rows.Add(packet.Timestamp.ToString("MM-dd-yyyy hh:mm:ss"), packet.Length, tcp.SequenceNumber , ip.IpV4.Protocol, ip.Source, tcp.SourcePort, ip.Destination, tcp.DestinationPort);
rtbPacketDeconstruct.Text = WordWrap(ProcessString(packet.BytesSequenceToHexadecimalString()),47);
string convertThis = ProcessString(packet.BytesSequenceToHexadecimalString());
dgvIncomingPackets.FirstDisplayedScrollingRowIndex = dgvIncomingPackets.RowCount - 1;
}
else
{
rtbCaptured.Text += "Error : TCP Null Value" + Environment.NewLine;
}
});
break;
default:
throw new InvalidOperationException("The result " + result + " should never be reached here");
}
}
catch (Exception ex)
{
this.BeginInvoke((Action)delegate ()
{ rtbCaptured.Text += "Exception : " + ex; });
}
}
}
}
}
The code above works however it is not detecting all of the skinny events. When viewing the network traffic with WireShark I am able to see the condition changes in a Cisco 7960 IP Phone including off hook, lamp messages, displaynotification messages.
While these packets are registered in Wireshark on my PC they appear not to be captured using the code above.
My understanding is that skinny uses tcp ports 2000 and 49828 for communication between CUCM and the device. My code does see the TCP ACK and WHOAMI packets.The MAC address being monitored in the Cisco IP Phone. My PC is connected to this device through the built in hub on the device(This isn't the issue because WireShark is showing the events on my PC where my code is not)
What am I missing here. I am a novice to programming and learning on the fly here. (As such I am aware my code isn't the cleanest or well written)
Thanks,