The SERVER command is only valid with a prefix when received from other
servers, so make sure that there is one and disconnect the peer if not
(instead of crashing ...).
This obsoletes PR #275.
Thanks Hilko Bengen (hillu) for finding & reporting this as well for the
patch & pull request! But I think this is the "more correct" fix.
if (!Client_CheckID(Client, Req->argv[0]))
return DISCONNECTED;
+ if (!Req->prefix) {
+ /* We definitely need a prefix here! */
+ Log(LOG_ALERT, "Got SERVER command without prefix! (on connection %d)",
+ Client_Conn(Client));
+ Conn_Close(Client_Conn(Client), NULL,
+ "SERVER command without prefix", true);
+ return DISCONNECTED;
+ }
+
from = Client_Search( Req->prefix );
if (! from) {
/* Uh, Server, that introduced the new server is unknown?! */