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nixos/duckdns: init module

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Wolfgang 2024-11-08 18:07:51 +01:00
parent f10c51a7ac
commit 9563f469c1
1 changed files with 125 additions and 0 deletions
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125
nixos/modules/services/misc/duckdns.nix Normal file
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{
config,
pkgs,
lib,
...
}:
let
cfg = config.services.duckdns;
duckdns = pkgs.writeShellScriptBin "duckdns" ''
DRESPONSE=$(curl -sS --max-time 60 --no-progress-meter -k -K- <<< "url = \"https://www.duckdns.org/update?verbose=true&domains=$DUCKDNS_DOMAINS&token=$DUCKDNS_TOKEN&ip=\"")
IPV4=$(echo "$DRESPONSE" | awk 'NR==2')
IPV6=$(echo "$DRESPONSE" | awk 'NR==3')
RESPONSE=$(echo "$DRESPONSE" | awk 'NR==1')
IPCHANGE=$(echo "$DRESPONSE" | awk 'NR==4')
if [[ "$RESPONSE" = "OK" ]] && [[ "$IPCHANGE" = "UPDATED" ]]; then
if [[ "$IPV4" != "" ]] && [[ "$IPV6" == "" ]]; then
echo "Your IP was updated at $(date) to IPv4: $IPV4"
elif [[ "$IPV4" == "" ]] && [[ "$IPV6" != "" ]]; then
echo "Your IP was updated at $(date) to IPv6: $IPV6"
else
echo "Your IP was updated at $(date) to IPv4: $IPV4 & IPv6 to: $IPV6"
fi
elif [[ "$RESPONSE" = "OK" ]] && [[ "$IPCHANGE" = "NOCHANGE" ]]; then
echo "DuckDNS request at $(date) successful. IP(s) unchanged."
else
echo -e "Something went wrong, please check your settings\nThe response returned was:\n$DRESPONSE\n"
exit 1
fi
'';
in
{
options.services.duckdns = {
enable = lib.mkEnableOption "DuckDNS Dynamic DNS Client";
tokenFile = lib.mkOption {
default = null;
type = lib.types.path;
description = ''
The path to a file containing the token
used to authenticate with DuckDNS.
'';
};
domains = lib.mkOption {
default = null;
type = lib.types.nullOr (lib.types.listOf lib.types.str);
example = [ "examplehost" ];
description = ''
The domain(s) to update in DuckDNS
(without the .duckdns.org suffix)
'';
};
domainsFile = lib.mkOption {
default = null;
type = lib.types.nullOr lib.types.path;
example = lib.literalExpression ''
pkgs.writeText "duckdns-domains.txt" '''
examplehost
examplehost2
examplehost3
'''
'';
description = ''
The path to a file containing a
newline-separated list of DuckDNS
domain(s) to be updated
(without the .duckdns.org suffix)
'';
};
};
config = lib.mkIf cfg.enable {
assertions = [
{
assertion = cfg.domains != null || cfg.domainsFile != null;
message = "Either services.duckdns.domains or services.duckdns.domainsFile has to be defined";
}
{
assertion = !(cfg.domains != null && cfg.domainsFile != null);
message = "services.duckdns.domains and services.duckdns.domainsFile can't both be defined at the same time";
}
{
assertion = (cfg.tokenFile != null);
message = "services.duckdns.tokenFile has to be defined";
}
];
environment.systemPackages = [ duckdns ];
systemd.services.duckdns = {
description = "DuckDNS Dynamic DNS Client";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
startAt = "*:0/5";
path = [
pkgs.gnused
pkgs.systemd
pkgs.curl
pkgs.gawk
duckdns
];
serviceConfig = {
Type = "simple";
LoadCredential = [
"DUCKDNS_TOKEN_FILE:${cfg.tokenFile}"
] ++ lib.optionals (cfg.domainsFile != null) [ "DUCKDNS_DOMAINS_FILE:${cfg.domainsFile}" ];
DynamicUser = true;
};
script = ''
export DUCKDNS_TOKEN=$(systemd-creds cat DUCKDNS_TOKEN_FILE)
${lib.optionalString (cfg.domains != null) ''
export DUCKDNS_DOMAINS='${lib.strings.concatStringsSep "," cfg.domains}'
''}
${lib.optionalString (cfg.domainsFile != null) ''
export DUCKDNS_DOMAINS=$(systemd-creds cat DUCKDNS_DOMAINS_FILE | sed -z 's/\n/,/g')
''}
exec ${lib.getExe duckdns}
'';
};
};
meta.maintainers = with lib.maintainers; [ notthebee ];
}