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Only the -ol options which act when a socket is bound (SO_REUSEADDR, SO_REUSEPORT, SO_EXCLUSIVEADDRUSE, SO_PORT_SCALABILITY, SO_REUSE_UNICASTPORT, IP_TRANSPARENT, TCP_FASTOPEN) must be the same for a socket to be taken over. The others are set on the socket taken over, those no longer given turned off; TCP_MAXSEG, whose default is not 0, still needs a new socket when it is dropped. Several services may still share an address, in one configuration or across reloads: each new one takes over a listener of its own, one of an old service of its type first, or opens another. A service connecting back (-r) has no socket to share, but now a listener without one for the place it connects to: on a reload the new service connecting to the same place takes it over, and the old service's clients are re-authenticated as its clients, as a listening service's are. Nothing moves from srvparam to the listener: its socket is what accept and UDP sessions use, and the rest is the service's configuration, which the listener only copies to compare. Tests: a live option changed keeps the socket, a bind-time one makes another, two services on one address are both taken over, and a download through a connect-back service goes on or is cut as its user is kept or removed. 3proxy(8) describes the takeover and re-authentication. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> |
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