public void TestNoQuery ()
{
var uri = new Uri ("imap://imap.gmail.com/");
var query = uri.ParsedQuery ();
Assert.AreEqual (0, query.Count, "Unexpected number of queries.");
}
public void TestSimpleQuery ()
{
var uri = new Uri ("imap://imap.gmail.com/?starttls=false");
var query = uri.ParsedQuery ();
Assert.AreEqual (1, query.Count, "Unexpected number of queries.");
Assert.AreEqual ("false", query["starttls"], "Unexpected value for 'starttls'.");
}
/// <summary>
/// Establish a connection to the specified mail server.
/// </summary>
/// <remarks>
/// Establishes a connection to the specified mail server.
/// </remarks>
/// <example>
/// <code language="c#" source="Examples\SmtpExamples.cs" region="SendMessageUri"/>
/// </example>
/// <param name="uri">The server URI.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// The <paramref name="uri"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentException">
/// The <paramref name="uri"/> is not an absolute URI.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="MailService"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="MailService"/> is already connected.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled via the cancellation token.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="ProtocolException">
/// A protocol error occurred.
/// </exception>
public void Connect (Uri uri, CancellationToken cancellationToken = default (CancellationToken))
{
if (uri == null)
throw new ArgumentNullException ("uri");
if (!uri.IsAbsoluteUri)
throw new ArgumentException ("The uri must be absolute.", "uri");
var protocol = uri.Scheme.ToLowerInvariant ();
var query = uri.ParsedQuery ();
SecureSocketOptions options;
string value;
// Note: early versions of MailKit used "pop3" and "pop3s"
if (protocol == "pop3s")
protocol = "pops";
else if (protocol == "pop3")
protocol = "pop";
if (protocol == Protocol + "s") {
options = SecureSocketOptions.SslOnConnect;
} else if (protocol != Protocol) {
throw new ArgumentException ("Unknown URI scheme.", "uri");
} else if (query.TryGetValue ("starttls", out value)) {
switch (value.ToLowerInvariant ()) {
default:
options = SecureSocketOptions.StartTlsWhenAvailable;
break;
case "always": case "true": case "yes":
options = SecureSocketOptions.StartTls;
break;
case "never": case "false": case "no":
options = SecureSocketOptions.None;
break;
}
} else {
options = SecureSocketOptions.StartTlsWhenAvailable;
}
Connect (uri.Host, uri.Port < 0 ? 0 : uri.Port, options, cancellationToken);
}
/// <summary>
/// Establishes a connection to the specified SMTP server.
/// </summary>
/// <remarks>
/// <para>Establishes a connection to an SMTP or SMTP/S server. If the schema
/// in the uri is "smtp", a clear-text connection is made and defaults to using
/// port 25 if no port is specified in the URI. However, if the schema in the
/// uri is "smtps", an SSL connection is made using the
/// <see cref="ClientCertificates"/> and defaults to port 465 unless a port
/// is specified in the URI.</para>
/// <para>It should be noted that when using a clear-text SMTP connection,
/// if the server advertizes support for the STARTTLS extension, the client
/// will automatically switch into TLS mode before authenticating unless the
/// <paramref name="uri"/> contains a query string to disable it.</para>
/// If a successful connection is made, the <see cref="AuthenticationMechanisms"/>
/// and <see cref="Capabilities"/> properties will be populated.
/// </remarks>
/// <param name="uri">The server URI. The <see cref="System.Uri.Scheme"/> should either
/// be "smtp" to make a clear-text connection or "smtps" to make an SSL connection.</param>
/// <param name="cancellationToken">A cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// <para>The <paramref name="uri"/> is <c>null</c>.</para>
/// </exception>
/// <exception cref="System.ArgumentException">
/// The <paramref name="uri"/> is not an absolute URI.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="SmtpClient"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="SmtpClient"/> is already connected.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="SmtpCommandException">
/// An SMTP command failed.
/// </exception>
/// <exception cref="SmtpProtocolException">
/// An SMTP protocol error occurred.
/// </exception>
public void Connect(Uri uri, CancellationToken cancellationToken = default (CancellationToken))
{
CheckDisposed ();
if (uri == null)
throw new ArgumentNullException ("uri");
if (!uri.IsAbsoluteUri)
throw new ArgumentException ("The uri must be absolute.", "uri");
if (IsConnected)
throw new InvalidOperationException ("The SmtpClient is already connected.");
capabilities = SmtpCapabilities.None;
authmechs.Clear ();
MaxSize = 0;
var smtps = uri.Scheme.ToLowerInvariant () == "smtps";
var port = uri.Port > 0 ? uri.Port : (smtps ? 465 : 25);
var query = uri.ParsedQuery ();
SmtpResponse response = null;
string value;
var starttls = !smtps && (!query.TryGetValue ("starttls", out value) || Convert.ToBoolean (value));
#if !NETFX_CORE
var ipAddresses = Dns.GetHostAddresses (uri.DnsSafeHost);
Socket socket = null;
for (int i = 0; i < ipAddresses.Length; i++) {
socket = new Socket (ipAddresses[i].AddressFamily, SocketType.Stream, ProtocolType.Tcp);
cancellationToken.ThrowIfCancellationRequested ();
try {
socket.Connect (ipAddresses[i], port);
localEndPoint = socket.LocalEndPoint;
break;
} catch {
if (i + 1 == ipAddresses.Length)
throw;
}
}
if (smtps) {
var ssl = new SslStream (new NetworkStream (socket, true), false, ValidateRemoteCertificate);
ssl.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Default, true);
stream = ssl;
} else {
stream = new NetworkStream (socket, true);
}
#else
socket = new StreamSocket ();
cancellationToken.ThrowIfCancellationRequested ();
socket.ConnectAsync (new HostName (uri.DnsSafeHost), port.ToString (), smtps ? SocketProtectionLevel.Tls12 : SocketProtectionLevel.PlainSocket)
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
stream = new DuplexStream (socket.InputStream.AsStreamForRead (), socket.OutputStream.AsStreamForWrite ());
#endif
if (stream.CanTimeout) {
stream.WriteTimeout = timeout;
stream.ReadTimeout = timeout;
}
host = uri.Host;
logger.LogConnect (uri);
try {
// read the greeting
response = ReadResponse (cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
// Send EHLO and get a list of supported extensions
Ehlo (cancellationToken);
if (starttls && (capabilities & SmtpCapabilities.StartTLS) != 0) {
response = SendCommand ("STARTTLS", cancellationToken);
if (response.StatusCode != SmtpStatusCode.ServiceReady)
throw new SmtpCommandException (SmtpErrorCode.UnexpectedStatusCode, response.StatusCode, response.Response);
#if !NETFX_CORE
var tls = new SslStream (stream, false, ValidateRemoteCertificate);
tls.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Tls, true);
stream = tls;
#else
socket.UpgradeToSslAsync (SocketProtectionLevel.Tls12, new HostName (uri.DnsSafeHost))
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
#endif
// Send EHLO again and get the new list of supported extensions
Ehlo (cancellationToken);
}
IsConnected = true;
} catch {
stream.Dispose ();
stream = null;
throw;
}
}
/// <summary>
/// Establishes a connection to the specified POP3 server.
/// </summary>
/// <remarks>
/// <para>Establishes a connection to an POP3 or POP3/S server. If the schema
/// in the uri is "pop", a clear-text connection is made and defaults to using
/// port 110 if no port is specified in the URI. However, if the schema in the
/// uri is "pops", an SSL connection is made using the
/// <see cref="ClientCertificates"/> and defaults to port 995 unless a port
/// is specified in the URI.</para>
/// <para>It should be noted that when using a clear-text POP3 connection,
/// if the server advertizes support for the STLS extension, the client
/// will automatically switch into TLS mode before authenticating unless
/// the <paramref name="uri"/> contains a query string to disable it.</para>
/// If a successful connection is made, the <see cref="AuthenticationMechanisms"/>
/// and <see cref="Capabilities"/> properties will be populated.
/// </remarks>
/// <param name="uri">The server URI. The <see cref="System.Uri.Scheme"/> should either
/// be "pop" to make a clear-text connection or "pops" to make an SSL connection.</param>
/// <param name="cancellationToken">A cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// The <paramref name="uri"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentException">
/// The <paramref name="uri"/> is not an absolute URI.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="Pop3Client"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="Pop3Client"/> is already connected.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled via the cancellation token.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="Pop3CommandException">
/// A POP3 command failed.
/// </exception>
/// <exception cref="Pop3ProtocolException">
/// A POP3 protocol error occurred.
/// </exception>
public void Connect(Uri uri, CancellationToken cancellationToken)
{
CheckDisposed ();
if (uri == null)
throw new ArgumentNullException ("uri");
if (!uri.IsAbsoluteUri)
throw new ArgumentException ("The uri must be absolute.", "uri");
if (IsConnected)
throw new InvalidOperationException ("The Pop3Client is already connected.");
var scheme = uri.Scheme.ToLowerInvariant ();
var pops = scheme == "pops" || scheme == "pop3s";
var port = uri.Port > 0 ? uri.Port : (pops ? 995 : 110);
var query = uri.ParsedQuery ();
#if !NETFX_CORE && !WINDOWS_APP && !WINDOWS_PHONE_APP
var ipAddresses = Dns.GetHostAddresses (uri.DnsSafeHost);
Socket socket = null;
#endif
Stream stream;
string value;
var starttls = !pops && (!query.TryGetValue ("starttls", out value) || Convert.ToBoolean (value));
#if !NETFX_CORE && !WINDOWS_APP && !WINDOWS_PHONE_APP
for (int i = 0; i < ipAddresses.Length; i++) {
socket = new Socket (ipAddresses[i].AddressFamily, SocketType.Stream, ProtocolType.Tcp);
cancellationToken.ThrowIfCancellationRequested ();
try {
socket.Connect (ipAddresses[i], port);
break;
} catch (Exception) {
if (i + 1 == ipAddresses.Length)
throw;
}
}
if (pops) {
var ssl = new SslStream (new NetworkStream (socket, true), false, ValidateRemoteCertificate);
ssl.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Default, true);
stream = ssl;
} else {
stream = new NetworkStream (socket, true);
}
#else
socket = new StreamSocket ();
cancellationToken.ThrowIfCancellationRequested ();
socket.ConnectAsync (new HostName (uri.DnsSafeHost), port.ToString (), pops ? SocketProtectionLevel.Tls12 : SocketProtectionLevel.PlainSocket)
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
stream = new DuplexStream (socket.InputStream.AsStreamForRead (), socket.OutputStream.AsStreamForWrite ());
#endif
probed = ProbedCapabilities.None;
host = uri.Host;
logger.LogConnect (uri);
engine.Connect (new Pop3Stream (stream, logger), cancellationToken);
engine.QueryCapabilities (cancellationToken);
if (starttls && (engine.Capabilities & Pop3Capabilities.StartTLS) != 0) {
SendCommand (cancellationToken, "STLS");
#if !NETFX_CORE && !WINDOWS_APP && !WINDOWS_PHONE_APP
var tls = new SslStream (stream, false, ValidateRemoteCertificate);
tls.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Tls, true);
engine.Stream.Stream = tls;
#else
socket.UpgradeToSslAsync (SocketProtectionLevel.Tls12, new HostName (uri.DnsSafeHost))
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
#endif
// re-issue a CAPA command
engine.QueryCapabilities (cancellationToken);
}
}
/// <summary>
/// Establishes a connection to the specified IMAP server.
/// </summary>
/// <remarks>
/// <para>Establishes a connection to an IMAP or IMAP/S server. If the schema
/// in the uri is "imap", a clear-text connection is made and defaults to using
/// port 143 if no port is specified in the URI. However, if the schema in the
/// uri is "imaps", an SSL connection is made using the
/// <see cref="ClientCertificates"/> and defaults to port 993 unless a port
/// is specified in the URI.</para>
/// <para>It should be noted that when using a clear-text IMAP connection,
/// if the server advertizes support for the STARTTLS extension, the client
/// will automatically switch into TLS mode before authenticating unless the
/// <paramref name="uri"/> contains a query string to disable it.</para>
/// <para>If the IMAP server advertizes the COMPRESS extension and either does not
/// support the STARTTLS extension or the <paramref name="uri"/> explicitly disabled
/// the use of the STARTTLS extension, then the client will automatically opt into
/// using a compressed data connection to optimize bandwidth usage unless the
/// <paramref name="uri"/> contains a query string to explicitly disable it.</para>
/// <para>If a successful connection is made, the <see cref="AuthenticationMechanisms"/>
/// and <see cref="Capabilities"/> properties will be populated.</para>
/// </remarks>
/// <param name="uri">The server URI. The <see cref="System.Uri.Scheme"/> should either
/// be "imap" to make a clear-text connection or "imaps" to make an SSL connection.</param>
/// <param name="cancellationToken">A cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// The <paramref name="uri"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentException">
/// The <paramref name="uri"/> is not an absolute URI.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="ImapClient"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="ImapClient"/> is already connected.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled via the cancellation token.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="ImapProtocolException">
/// An IMAP protocol error occurred.
/// </exception>
public void Connect(Uri uri, CancellationToken cancellationToken)
{
CheckDisposed ();
if (uri == null)
throw new ArgumentNullException ("uri");
if (!uri.IsAbsoluteUri)
throw new ArgumentException ("The uri must be absolute.", "uri");
if (IsConnected)
throw new InvalidOperationException ("The ImapClient is already connected.");
var imaps = uri.Scheme.ToLowerInvariant () == "imaps";
var port = uri.Port > 0 ? uri.Port : (imaps ? 993 : 143);
var query = uri.ParsedQuery ();
Stream stream;
string value;
var starttls = !imaps && (!query.TryGetValue ("starttls", out value) || Convert.ToBoolean (value));
var compress = !imaps && (!query.TryGetValue ("compress", out value) || Convert.ToBoolean (value));
#if !NETFX_CORE
var ipAddresses = Dns.GetHostAddresses (uri.DnsSafeHost);
Socket socket = null;
for (int i = 0; i < ipAddresses.Length; i++) {
socket = new Socket (ipAddresses[i].AddressFamily, SocketType.Stream, ProtocolType.Tcp);
cancellationToken.ThrowIfCancellationRequested ();
try {
socket.Connect (ipAddresses[i], port);
break;
} catch {
if (i + 1 == ipAddresses.Length)
throw;
}
}
if (imaps) {
var ssl = new SslStream (new NetworkStream (socket, true), false, ValidateRemoteCertificate);
ssl.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Default, true);
stream = ssl;
} else {
stream = new NetworkStream (socket, true);
}
#else
socket = new StreamSocket ();
cancellationToken.ThrowIfCancellationRequested ();
socket.ConnectAsync (new HostName (uri.DnsSafeHost), port.ToString (), imaps ? SocketProtectionLevel.Tls12 : SocketProtectionLevel.PlainSocket)
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
stream = new DuplexStream (socket.InputStream.AsStreamForRead (), socket.OutputStream.AsStreamForWrite ());
#endif
host = uri.Host;
logger.LogConnect (uri);
engine.Connect (new ImapStream (stream, logger), cancellationToken);
// Only query the CAPABILITIES if the greeting didn't include them.
if (engine.CapabilitiesVersion == 0)
engine.QueryCapabilities (cancellationToken);
if (starttls && (engine.Capabilities & ImapCapabilities.StartTLS) != 0) {
var ic = engine.QueueCommand (cancellationToken, null, "STARTTLS\r\n");
engine.Wait (ic);
if (ic.Result == ImapCommandResult.Ok) {
#if !NETFX_CORE
var tls = new SslStream (stream, false, ValidateRemoteCertificate);
tls.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Tls, true);
engine.Stream.Stream = tls;
#else
socket.UpgradeToSslAsync (SocketProtectionLevel.Tls12, new HostName (uri.DnsSafeHost))
.AsTask (cancellationToken)
.GetAwaiter ()
.GetResult ();
#endif
// Query the CAPABILITIES again if the server did not include an
// untagged CAPABILITIES response to the STARTTLS command.
if (engine.CapabilitiesVersion == 1)
engine.QueryCapabilities (cancellationToken);
}
} else if (compress && (engine.Capabilities & ImapCapabilities.Compress) != 0) {
var ic = engine.QueueCommand (cancellationToken, null, "COMPRESS DEFLATE\r\n");
engine.Wait (ic);
if (ic.Result == ImapCommandResult.Ok) {
var unzip = new DeflateStream (stream, CompressionMode.Decompress);
var zip = new DeflateStream (stream, CompressionMode.Compress);
engine.Stream.Stream = new DuplexStream (unzip, zip);
// Query the CAPABILITIES again if the server did not include an
// untagged CAPABILITIES response to the COMPRESS command.
if (engine.CapabilitiesVersion == 1)
engine.QueryCapabilities (cancellationToken);
}
}
}
/// <summary>
/// Establishes a connection to the specified IMAP server.
/// </summary>
/// <remarks>
/// <para>Establishes a connection to an IMAP or IMAP/S server. If the schema
/// in the uri is "imap", a clear-text connection is made and defaults to using
/// port 143 if no port is specified in the URI. However, if the schema in the
/// uri is "imaps", an SSL connection is made using the
/// <see cref="ClientCertificates"/> and defaults to port 993 unless a port
/// is specified in the URI.</para>
/// <para>It should be noted that when using a clear-text IMAP connection,
/// if the server advertizes support for the STARTTLS extension, the client
/// will automatically switch into TLS mode before authenticating unless the
/// <paramref name="uri"/> contains a query string to disable it.</para>
/// <para>If the IMAP server advertizes the COMPRESS extension and either does not
/// support the STARTTLS extension or the <paramref name="uri"/> explicitly disabled
/// the use of the STARTTLS extension, then the client will automatically opt into
/// using a compressed data connection to optimize bandwidth usage unless the
/// <paramref name="uri"/> contains a query string to explicitly disable it.</para>
/// <para>If a successful connection is made, the <see cref="AuthenticationMechanisms"/>
/// and <see cref="Capabilities"/> properties will be populated.</para>
/// </remarks>
/// <param name="uri">The server URI. The <see cref="System.Uri.Scheme"/> should either
/// be "imap" to make a clear-text connection or "imaps" to make an SSL connection.</param>
/// <param name="cancellationToken">A cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// The <paramref name="uri"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentException">
/// The <paramref name="uri"/> is not an absolute URI.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="ImapClient"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="ImapClient"/> is already connected.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled via the cancellation token.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="ImapProtocolException">
/// An IMAP protocol error occurred.
/// </exception>
public void Connect(Uri uri, CancellationToken cancellationToken)
{
CheckDisposed ();
if (uri == null)
throw new ArgumentNullException ("uri");
if (!uri.IsAbsoluteUri)
throw new ArgumentException ("The uri must be absolute.", "uri");
if (IsConnected)
throw new InvalidOperationException ("The ImapClient is already connected.");
bool imaps = uri.Scheme.ToLowerInvariant () == "imaps";
int port = uri.Port > 0 ? uri.Port : (imaps ? 993 : 143);
var ipAddresses = Dns.GetHostAddresses (uri.DnsSafeHost);
var query = uri.ParsedQuery ();
Socket socket = null;
Stream stream;
string value;
var starttls = !imaps && (!query.TryGetValue ("starttls", out value) || Convert.ToBoolean (value));
var compress = !imaps && (!query.TryGetValue ("compress", out value) || Convert.ToBoolean (value));
for (int i = 0; i < ipAddresses.Length; i++) {
socket = new Socket (ipAddresses[i].AddressFamily, SocketType.Stream, ProtocolType.Tcp);
cancellationToken.ThrowIfCancellationRequested ();
try {
socket.Connect (ipAddresses[i], port);
break;
} catch (Exception) {
if (i + 1 == ipAddresses.Length)
throw;
}
}
if (imaps) {
var ssl = new SslStream (new NetworkStream (socket, true), false, ValidateRemoteCertificate);
ssl.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Default, true);
stream = ssl;
} else {
stream = new NetworkStream (socket, true);
}
host = uri.Host;
logger.LogConnect (uri);
engine.Connect (new ImapStream (stream, logger), cancellationToken);
// Only query the CAPABILITIES if the greeting didn't include them.
if (engine.CapabilitiesVersion == 0)
engine.QueryCapabilities (cancellationToken);
if (!starttls)
engine.Capabilities &= ~ImapCapabilities.StartTLS;
if (!compress)
engine.Capabilities &= ~ImapCapabilities.Compress;
}
/// <summary>
/// Establishes a connection to the specified POP3 server.
/// </summary>
/// <remarks>
/// <para>Establishes a connection to an POP3 or POP3/S server. If the schema
/// in the uri is "pop", a clear-text connection is made and defaults to using
/// port 110 if no port is specified in the URI. However, if the schema in the
/// uri is "pops", an SSL connection is made using the
/// <see cref="ClientCertificates"/> and defaults to port 995 unless a port
/// is specified in the URI.</para>
/// <para>It should be noted that when using a clear-text POP3 connection,
/// if the server advertizes support for the STLS extension, the client
/// will automatically switch into TLS mode before authenticating unless
/// the <paramref name="uri"/> contains a query string to disable it.</para>
/// If a successful connection is made, the <see cref="AuthenticationMechanisms"/>
/// and <see cref="Capabilities"/> properties will be populated.
/// </remarks>
/// <param name="uri">The server URI. The <see cref="System.Uri.Scheme"/> should either
/// be "pop" to make a clear-text connection or "pops" to make an SSL connection.</param>
/// <param name="cancellationToken">A cancellation token.</param>
/// <exception cref="System.ArgumentNullException">
/// The <paramref name="uri"/> is <c>null</c>.
/// </exception>
/// <exception cref="System.ArgumentException">
/// The <paramref name="uri"/> is not an absolute URI.
/// </exception>
/// <exception cref="System.ObjectDisposedException">
/// The <see cref="Pop3Client"/> has been disposed.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// The <see cref="Pop3Client"/> is already connected.
/// </exception>
/// <exception cref="System.OperationCanceledException">
/// The operation was canceled via the cancellation token.
/// </exception>
/// <exception cref="System.IO.IOException">
/// An I/O error occurred.
/// </exception>
/// <exception cref="Pop3CommandException">
/// A POP3 command failed.
/// </exception>
/// <exception cref="Pop3ProtocolException">
/// A POP3 protocol error occurred.
/// </exception>
public void Connect(Uri uri, CancellationToken cancellationToken)
{
CheckDisposed ();
if (uri == null)
throw new ArgumentNullException ("uri");
if (!uri.IsAbsoluteUri)
throw new ArgumentException ("The uri must be absolute.", "uri");
if (IsConnected)
throw new InvalidOperationException ("The Pop3Client is already connected.");
var scheme = uri.Scheme.ToLowerInvariant ();
bool pops = scheme == "pops" || scheme == "pop3s";
int port = uri.Port > 0 ? uri.Port : (pops ? 995 : 110);
var ipAddresses = Dns.GetHostAddresses (uri.DnsSafeHost);
var query = uri.ParsedQuery ();
Socket socket = null;
Stream stream;
string value;
var starttls = !pops && (!query.TryGetValue ("starttls", out value) || Convert.ToBoolean (value));
for (int i = 0; i < ipAddresses.Length; i++) {
socket = new Socket (ipAddresses[i].AddressFamily, SocketType.Stream, ProtocolType.Tcp);
cancellationToken.ThrowIfCancellationRequested ();
try {
socket.Connect (ipAddresses[i], port);
break;
} catch (Exception) {
if (i + 1 == ipAddresses.Length)
throw;
}
}
if (pops) {
var ssl = new SslStream (new NetworkStream (socket, true), false, ValidateRemoteCertificate);
ssl.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Default, true);
stream = ssl;
} else {
stream = new NetworkStream (socket, true);
}
probed = ProbedCapabilities.None;
host = uri.Host;
logger.LogConnect (uri);
engine.Connect (new Pop3Stream (stream, logger), cancellationToken);
engine.QueryCapabilities (cancellationToken);
if (starttls && (engine.Capabilities & Pop3Capabilities.StartTLS) != 0) {
SendCommand (cancellationToken, "STLS");
var tls = new SslStream (stream, false, ValidateRemoteCertificate);
tls.AuthenticateAsClient (uri.Host, ClientCertificates, SslProtocols.Tls, true);
engine.Stream.Stream = tls;
// re-issue a CAPA command
engine.QueryCapabilities (cancellationToken);
}
}