feat: add support for systemd listener activation sockets #205
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To support starting a network service on demand and to support a "least privilege-approach" with regards to the permission a network service process needs to have, systemd supports opening a network socket on behalf of the service and passing it as an open file descriptor. The service gets notified about open file descriptors for this purpose as well as metadata such as named listeners via environment variables. This patch adds support for prefixing the listen address passed with --address with "sd-listen-fd:" to access these file descriptors, taking either a listener name passed using the `LISTEN_FDNAMES` environment variable or `LISTEN_FD_$n` for unnamed file descriptiors where `n` is the id of the descriptor starting at 3 (LISTEN_FD_3). See sd_listen_fds(3)
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hacdias
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Dec 11, 2024
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To support starting a network service on demand and to support a "least privilege-approach" with regards to the permission a network service process needs to have, systemd supports opening a network socket on behalf of the service and passing it as an open file descriptor.
The service gets notified about open file descriptors for this purpose as well as metadata such as named listeners via environment variables.
This pull request adds support for prefixing the listen address passed with --address with
"sd-listen-fd:"to access these file descriptors, taking either a listener name passed using theLISTEN_FDNAMESenvironment variable orLISTEN_FD_$nfor unnamed file descriptiors wherenis the id of the descriptor starting at 3 (LISTEN_FD_3).See sd_listen_fds(3)