SocketConnectSSL (Function)

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Optimizing the connections for an IP address
Timeout

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SocketConnectSSL (Function)

In french: SocketConnecteSSL

Used to establish a secure connection to an SSL server.

Example

IF SocketConnectSSL("Server", 8000, "150.134.20") = False THEN
Error("Connection error" + ErrorInfo(errMessage))
END

Syntax

<Result> = SocketConnectSSL(<Socket name> , <Port number> , <Address> [, <SSL option> [, <Maximum timeout> [, <Client certificate>]]])

<Result>: Boolean

True if the connection was established,
False otherwise. If an error occurs, you can get the details of the error with ErrorInfo.

<Socket name>: Character string (with quotes)

Name that will be given to the connection opened on the server socket. This name will be used by all socket functions.
Caution: the socket name is case sensitive.

<Port number>: Integer

Port number of socket. If you are using a socket associated with a preset protocol, use the port number associated with the protocol.
If the socket was created by a WINDEV application, this number must be included between 5 000 and 65 000. In this case, the number must be identical to the port number specified in SocketCreateSSL.

<Address>: Character string (with quotes)

Address of server. If this parameter is not specified, the server is sought on the current computer. This address can be given in the following format:
IP address in XXX.XXX.XXX.XXX format (125.5.110.100 for example).
URL containing the server name (www.windev.com for example). This syntax is recommended.
The address can also correspond to the IP address returned by NetIPAddress.

<SSL option>: Optional combination of integer constants

Used to choose the protocol and the identification mode:
ProtocolSSL2 The SSL2 protocol will be used
ProtocolSSL3 The SSL3 protocol will be used
ProtocolTLS1 The TLS1 protocol will be used
Versions 22 and later
ProtocolTLS1_1
New in version 22
ProtocolTLS1_1
ProtocolTLS1_1 The TLS 1.1 protocol will be used
Versions 22 and later
ProtocolTLS1_2
New in version 22
ProtocolTLS1_2
ProtocolTLS1_2 The TLS 1.2 protocol will be used

By default, the combination used is: ProtocolTLS1 + ProtocolTLS1_1 + ProtocoleTLS1_2.

<Maximum timeout>: Optional integer or optional Duration

Maximum timeout (in milliseconds) for establishing the connection. This timeout will be used if the server refuses the connection (SocketDeny). In this case, the connection will not be locking.
This parameter can correspond to:
an integer corresponding to the number of milliseconds,
a Duration variable,
Versions 23 and later
the direct indication of duration (1 s or 10 ms for example).
New in version 23
the direct indication of duration (1 s or 10 ms for example).
the direct indication of duration (1 s or 10 ms for example).
This wait is equal to 10 milliseconds by default.

<Client certificate>: Certificate variable

Versions 19 and later
Name of the Certificate variable allowing the server to authenticate the client that wants to connect and to check whether this client is allowed to access the server. This certificate must be recognized on the server.
New in version 19
Name of the Certificate variable allowing the server to authenticate the client that wants to connect and to check whether this client is allowed to access the server. This certificate must be recognized on the server.
Name of the Certificate variable allowing the server to authenticate the client that wants to connect and to check whether this client is allowed to access the server. This certificate must be recognized on the server.

Remarks

Optimizing the connections for an IP address

When an IP address is passed to SocketConnectSSL, the connection can be optimized by using the following code:

Socket.Option = SocketOptimizeIPConnection

This option is not enabled by default because the connection may fail in some configurations. However, it may be useful in some applications for which the performances are critical.

Remark: To restore the default operating mode, all you have to do is use the SocketOptionDefault constant:

Socket.Option = SocketOptionDefault

Timeout

The timeout specified by <Maximum timeout> groups the timeout of two steps:

the timeout for address resolution: this timeout cannot be configured and it can be optimized (see below).
the maximum timeout for the connection to be accepted by the server. Several cases may occur:
- the server refuses the connection.
- the server accepts the connection within the timeout
- the server is not available.
- the specified address is invalid.

To optimize the timeout for address resolution (time required to find the address), we advise you to:

use a DNS on the network. Therefore, this address will be sought toward this server and not for each computer (1 search instead of x searches where x represents the number of computers). Each computer must be registered toward this server.
for an IP address, use Socket.Option = SocketOptimizeIPConnection.

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