net.server_epoll: Add support for systemd socket activation
Allows creating listening sockets and accepting client connections
before Prosody starts.
This is unlike normal Prosody dynamic resource management, where ports
may added and removed at any time, and the ports defined by the config.
Weird things happen if these are closed (e.g. due to reload) so here we
prevent closing and ensure sockets are reused when opened again.
Should pass: 41 42 43 # Simple ASCII - abc
Should pass: 41 42 c3 87 # "ABÇ"
Should pass: 41 42 e1 b8 88 # "ABḈ"
Should pass: 41 42 f0 9d 9c 8d # "AB𝜍"
Should pass: F4 8F BF BF # Last valid sequence (U+10FFFF)
Should fail: F4 90 80 80 # First invalid sequence (U+110000)
Should fail: 80 81 82 83 # Invalid sequence (invalid start byte)
Should fail: C2 C3 # Invalid sequence (invalid continuation byte)
Should fail: C0 43 # Overlong sequence
Should fail: F5 80 80 80 # U+140000 (out of range)
Should fail: ED A0 80 # U+D800 (forbidden by RFC 3629)
Should fail: ED BF BF # U+DFFF (forbidden by RFC 3629)
Should pass: ED 9F BF # U+D7FF (U+D800 minus 1: allowed)
Should pass: EE 80 80 # U+E000 (U+D7FF plus 1: allowed)
Should fail: C0 # Invalid start byte
Should fail: C1 # Invalid start byte
Should fail: C2 # Incomplete sequence
Should fail: F8 88 80 80 80 # 6-byte sequence
Should pass: 7F # Last valid 1-byte sequence (U+00007F)
Should pass: DF BF # Last valid 2-byte sequence (U+0007FF)
Should pass: EF BF BF # Last valid 3-byte sequence (U+00FFFF)
Should pass: 00 # First valid 1-byte sequence (U+000000)
Should pass: C2 80 # First valid 2-byte sequence (U+000080)
Should pass: E0 A0 80 # First valid 3-byte sequence (U+000800)
Should pass: F0 90 80 80 # First valid 4-byte sequence (U+000800)
Should fail: F8 88 80 80 80 # First 5-byte sequence - invalid per RFC 3629
Should fail: FC 84 80 80 80 80 # First 6-byte sequence - invalid per RFC 3629
Should pass: EF BF BD # U+00FFFD (replacement character)
Should fail: 80 # First continuation byte
Should fail: BF # Last continuation byte
Should fail: 80 BF # 2 continuation bytes
Should fail: 80 BF 80 # 3 continuation bytes
Should fail: 80 BF 80 BF # 4 continuation bytes
Should fail: 80 BF 80 BF 80 # 5 continuation bytes
Should fail: 80 BF 80 BF 80 BF # 6 continuation bytes
Should fail: 80 BF 80 BF 80 BF 80 # 7 continuation bytes
Should fail: FE # Impossible byte
Should fail: FF # Impossible byte
Should fail: FE FE FF FF # Impossible bytes
Should fail: C0 AF # Overlong "/"
Should fail: E0 80 AF # Overlong "/"
Should fail: F0 80 80 AF # Overlong "/"
Should fail: F8 80 80 80 AF # Overlong "/"
Should fail: FC 80 80 80 80 AF # Overlong "/"
Should fail: C0 80 AF # Overlong "/" (invalid)
Should fail: C1 BF # Overlong
Should fail: E0 9F BF # Overlong
Should fail: F0 8F BF BF # Overlong
Should fail: F8 87 BF BF BF # Overlong
Should fail: FC 83 BF BF BF BF # Overlong
Should pass: EF BF BE # U+FFFE (invalid unicode, valid UTF-8)
Should pass: EF BF BF # U+FFFF (invalid unicode, valid UTF-8)