jabber.developer2
a283c4e7b4
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RFC 6120 §8.1.2.1: a stanza received over a c2s stream without a 'from' attribute must be treated as coming from the server itself. The on-connect disco#info handler passed the absent attribute as NULL into connection_features_received(), where g_str_hash() dereferenced the NULL key and crashed (remotely triggerable DoS on connect). Substitute connection_get_domain() at both disco#info handler boundaries, and make connection_features_received() and connection_get_features() NULL-safe as defense in depth. Add a stabber regression test answering the on-connect disco#info with a from-less result. Fixes #168