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Daemon: authenticate socket peers - #65
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Each accepted control-socket connection is checked with getpeereid(): only uid 0 and the daemon's owner uid are served, as a second layer behind the socket's 0600 permissions. Rejected connections are closed before any byte is read, never hold a slot, and are logged at a bounded rate. Accepts are capped at 64 per event. Daemon and client sockets set SO_NOSIGPIPE so a peer that hangs up costs an EPIPE, not the process. Socket tests run serialized with outcome-based waits.
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Closes nothing. CI check before merge.