Starting https connection with IP address and SNI

问题

I'm using WinHttpConnect in order to establish an https connection between my windows app and a remote server. However, my server doesn't necessarily have DNS address so the connection is made with setting pswzServerName to raw IPV4 address.

WINHTTPAPI
HINTERNET
WINAPI
WinHttpConnect
(
    IN HINTERNET hSession,
    IN LPCWSTR pswzServerName,
    IN INTERNET_PORT nServerPort,
    IN DWORD dwReserved
);

Since there are several services on that remote server, I also need to specify the SNI (Server Name Indication) so that the TLS handshake will pass.

How can I pass the SNI separately from the IP address?

currently, the client hello packet contain SNI (see below) only if I open the connection with Url and the SNI matches that of the URL

In OpenSSL, there's a way to separate between SNI and URL, and I'm looking how to do so in windows API :

OpenSSL s_client -servername appliance1 -connect 192.0.2.4:443

EDIT:

Following the comments below, it seems like the method InitializeSecurityContextA should be called prior to WinHttpConnect with pszTargetName set as the requested server name.

However, what should I do with the other parameters if I wish to get their default value?

Here's my current implementation, How should I add the InitializeSecurityContextA in order to change the server name.

void connectFunction(std::string server/* can be ip address as well*/ , HINTERNET connectionHandle)
{

   sessionHandle = WinHttpOpen(
        NULL,
        WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
        WINHTTP_NO_PROXY_NAME,
        WINHTTP_NO_PROXY_BYPASS,
        0
    );

    connectionHandle = WinHttpConnect(sessionHandle, server.c_str(), port, 0); 
    // this will trigger the TLS handshake, and I want to add SNI different than `server` param

来源：https://stackoverflow.com/questions/57479973/starting-https-connection-with-ip-address-and-sni