[gnutls-devel] GnuTLS | OpenSSL IPv6 PSK Incompatibility (#683)

[Development of GNU's TLS library]

> RFC 6066 says: Literal IPv4 and IPv6 addresses are not permitted in "HostName".

The checking code is
```
if (!(c_isalnum(str[i]) || str[i] == '-' || str[i] == '.'))
    return 0;
```

So IPv4 addresses are accepted. Just IPv6 not because they contain colons which are forbidden in DNS names.

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