[gnutls-devel] GnuTLS | gnutls-cli cannot specify server name while doing xmpp starttls (#777)

[Development of GNU's TLS library]

This line https://gitlab.com/gnutls/gnutls/blob/master/src/socket.c#L250 is always using socket. 

Maybe we can reuse --verify-hostname arg for that, or create a new "request hostname/xmpp host" (as openssl does):

```
// NOT TESTED
const char *host;
if (HAVE_OPT(VERIFY_HOSTNAME)) {
	host = OPT_ARG(VERIFY_HOSTNAME);
	canonicalize_host((char *) host, NULL, 0);
} else
	host = socket->hostname;
snprintf(buf, sizeof(buf), "<stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:client' to='%s' version='1.0'>\n", host);
```

Or redefine socket->hostname inside socket_open2 after conn is openned. Or even a new field in socket for that.

I don't know what is the best option. I only know that socket->hostname used by STARTTLS (any protocol) should be user definable.

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