<p>Concerns the following code: <a href="https://github.com/kamailio/kamailio/blob/master/src/modules/tls/tls_domain.c#L1567">https://github.com/kamailio/kamailio/blob/master/src/modules/tls/tls_domain.c#L1567</a></p>
<p>Let's say <code>sname = sip.example.com</code> and <code>p->server_name = example.com</code>.</p>
<pre><code>dotpos = sname->len - p->server_name.len;
> dotpos = len("sip.example.com") - len("example.com")
> dotpos = 15 - 11 = 4

if (sname->s[dotpos] == '.')
> if ("sip.example.com"[4] == '.')
</code></pre>
<p><code>sip.example.com"[4]</code> is "e", not "." so the if clause will always fail and subdomains will never be matched.</p>

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