Berwn
848c4ec47d
The control/ns1/ns2 mesh IPs and the /88 subnet were duplicated literals in mesh-hosts.nix. clan-core's zerotier generator already writes each machine's IP as a public var (vars/per-machine/<m>/zerotier/zerotier-ip), so read from there and derive the subnet from zerotier-network-id. Pure refactor: the rendered values are identical and the system derivation hash is unchanged.
31 lines
1.4 KiB
Nix
31 lines
1.4 KiB
Nix
# ZeroTier (clan mesh) addresses — the private IPv6 overlay every machine shares.
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# DNS zone transfers and metrics scraping ride this mesh, never the public net.
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#
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# Rather than hardcoding the addresses, we read them from the public clan vars
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# that clan-core's zerotier generator already writes per machine
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# (vars/per-machine/<m>/zerotier/zerotier-ip/value). This keeps the mesh map in
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# lockstep with the actual identities: regenerate or re-key a node and its
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# address here follows automatically. Call as: import ../mesh-hosts.nix { inherit config lib; }.
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{ config, lib }:
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let
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dir = config.clan.core.settings.directory;
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readVar =
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machine: file:
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builtins.readFile "${dir}/vars/per-machine/${machine}/zerotier/${file}/value";
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hosts = lib.genAttrs [ "control" "ns1" "ns2" ] (m: readVar m "zerotier-ip");
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# RFC 4193 prefix of this ZeroTier network: fd + the 8-byte network id + the
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# 0x9993 marker. The network id is a public var on the controller (control).
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# The /88 (11 bytes) covers fd + network id + 0x99 + 0x93, i.e. every mesh peer,
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# and is used to scope mesh-only firewall rules.
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networkId = readVar "control" "zerotier-network-id";
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full = "fd" + networkId + "9993"; # 22 hex chars = 11 bytes
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hextet = i: builtins.substring (i * 4) 4 full;
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subnet = "${hextet 0}:${hextet 1}:${hextet 2}:${hextet 3}:${hextet 4}:${builtins.substring 20 2 full}00::/88";
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in
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{
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inherit hosts subnet;
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}
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