fix trust-dns to resolve when invoked from VPN
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@ -1,7 +1,9 @@
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{ config, lib, pkgs, ... }:
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let
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bindForOvpn = "10.0.1.5";
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bindLan = config.sane.hosts.by-name."servo".lan-ip;
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bindHn = config.sane.hosts.by-name."servo".wg-home.ip;
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bindOvpn = "10.0.1.5";
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in
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{
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services.trust-dns.enable = true;
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@ -75,13 +77,37 @@ in
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zone-lan = "${zone-dir}/lan/uninsane.org.zone";
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zone-hn = "${zone-dir}/hn/uninsane.org.zone";
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zone-template = pkgs.writeText "uninsane.org.zone.in" config.sane.dns.zones."uninsane.org".rendered;
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extra-config-hn = pkgs.writeText "hn-config.toml" ''
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hn-resolver-config = pkgs.writeText "hn-resolver-config.toml" ''
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# i host a resolver in the wireguard VPN so that clients can resolve DNS through the VPN.
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# (that's what this file achieves).
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#
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# one would expect this resolver could host the authoritative zone for `uninsane.org`, and then forward everything else to the system resolver...
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# and while that works for `dig`, it breaks for `nslookup` (and so `ssh`, etc).
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#
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# DNS responses include a flag for if the responding server is the authority of the zone queried.
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# it seems that default Linux stub resolvers either:
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# - expect DNSSEC when the response includes that bit, or
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# - expect A records to be in the `answer` section instead of `additional` section.
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# or perhaps something more nuanced. but for `nslookup` to be reliable, it has to talk to an
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# instance of trust-dns which is strictly a resolver, with no authority.
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# hence, this config: a resolver which forwards to the actual authority.
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listen_addrs_ipv4 = ["${bindHn}"]
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listen_addrs_ipv6 = []
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[[zones]]
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zone = "uninsane.org"
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zone_type = "Forward"
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stores = { type = "forward", name_servers = [{ socket_addr = "${bindHn}:1053", protocol = "udp", trust_nx_responses = true }] }
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[[zones]]
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# forward the root zone to the local DNS resolver
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zone = "."
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zone_type = "Forward"
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stores = { type = "forward", name_servers = [{ socket_addr = "127.0.0.53:53", protocol = "udp", trust_nx_responses = true }] }
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'';
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# TODO: rework this shell script to be independent systemd services per trust-dns instance.
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in pkgs.writeShellScriptBin "trust-dns" ''
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# intercept args meant for the real trust-dns, so i can modify them
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_arg__config="$1" # --config
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@ -92,9 +118,9 @@ in
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# compute IP address of self for each interface
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mkdir -p ${zone-dir}/{wan,lan,hn}
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wan=$(cat '${config.sane.services.dyn-dns.ipPath}')
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lan=${config.sane.hosts.by-name."servo".lan-ip}
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hn=${config.sane.hosts.by-name."servo".wg-home.ip}
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lanAndOvpn='${config.sane.hosts.by-name."servo".lan-ip}", "${bindForOvpn}'
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lan=${bindLan}
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hn=${bindHn}
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lanAndOvpn='${bindLan}", "${bindOvpn}'
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# create specializations that resolve native.uninsane.org to different CNAMEs
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${sed} \
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@ -110,6 +136,7 @@ in
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-e s/%CNAMENATIVE%/servo.lan/ \
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-e s/%ANATIVE%/$lan/ \
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${zone-template} > ${zone-lan}
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# to service LAN, listen only on the LAN
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sed s/%LISTEN%/$lan/ $orig_config > ${zone-dir}/lan-config.toml
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${sed} \
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@ -117,8 +144,8 @@ in
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-e s/%CNAMENATIVE%/servo.hn/ \
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-e s/%ANATIVE%/$hn/ \
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${zone-template} > ${zone-hn}
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cat "$orig_config" "${extra-config-hn}" \
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| ${sed} s/%LISTEN%/$hn/ > "${zone-dir}/hn-config.toml"
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# to service wireguard, listen only on hn
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sed s/%LISTEN%/$hn/ $orig_config > ${zone-dir}/hn-config.toml
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# launch the different interfaces, separately
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${pkgs.trust-dns}/bin/trust-dns \
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@ -131,16 +158,22 @@ in
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"$@" &
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LANPID=$!
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ln -sf ${hn-resolver-config} ${zone-dir}/hn-resolver-config.toml
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${pkgs.trust-dns}/bin/trust-dns \
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--config "${zone-dir}/hn-resolver-config.toml" \
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"$@" &
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HNRESOLVERPID=$!
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${pkgs.trust-dns}/bin/trust-dns --port 1053 \
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--zonedir "${zone-dir}/hn/" --config "${zone-dir}/hn-config.toml" \
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"$@" &
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HNPID=$!
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# wait until any of the processes exits, then kill them all and exit error
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while kill -0 $WANPID $LANPID $HNPID; do
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while kill -0 $WANPID $LANPID $HNRESOLVERPID $HNPID; do
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sleep 5
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done
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kill $WANPID $LANPID $HNPID
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kill $WANPID $LANPID $HNRESOLVERPID $HNPID
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exit 1
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'';
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