{ config, lib, pkgs, ... }: let inherit (lib) mkIf mkMerge; inherit (lib) concatStringsSep optionalString; cfg = config.services.hylafax; mapModems = lib.forEach (lib.attrValues cfg.modems); mkConfigFile = name: conf: # creates hylafax config file, # makes sure "Include" is listed *first* let mkLines = conf: (lib.concatLists (lib.flip lib.mapAttrsToList conf (k: map (v: "${k}: ${v}") ))); include = mkLines { Include = conf.Include or []; }; other = mkLines ( conf // { Include = []; } ); in pkgs.writeText "hylafax-config${name}" (concatStringsSep "\n" (include ++ other)); globalConfigPath = mkConfigFile "" cfg.faxqConfig; modemConfigPath = let mkModemConfigFile = { config, name, ... }: mkConfigFile ".${name}" (cfg.commonModemConfig // config); mkLine = { name, type, ... }@modem: '' # check if modem config file exists: test -f "${pkgs.hylafaxplus}/spool/config/${type}" ln \ --symbolic \ --no-target-directory \ "${mkModemConfigFile modem}" \ "$out/config.${name}" ''; in pkgs.runCommand "hylafax-config-modems" { preferLocalBuild = true; } ''mkdir --parents "$out/" ${concatStringsSep "\n" (mapModems mkLine)}''; setupSpoolScript = pkgs.substituteAll { name = "hylafax-setup-spool.sh"; src = ./spool.sh; isExecutable = true; inherit (pkgs.stdenv) shell; hylafax = pkgs.hylafaxplus; faxuser = "uucp"; faxgroup = "uucp"; lockPath = "/var/lock"; inherit globalConfigPath modemConfigPath; inherit (cfg) sendmailPath spoolAreaPath userAccessFile; }; waitFaxqScript = pkgs.substituteAll { # This script checks the modems status files # and waits until all modems report readiness. name = "hylafax-faxq-wait-start.sh"; src = ./faxq-wait.sh; isExecutable = true; timeoutSec = toString 10; inherit (pkgs.stdenv) shell; inherit (cfg) spoolAreaPath; }; sockets.hylafax-hfaxd = { description = "HylaFAX server socket"; documentation = [ "man:hfaxd(8)" ]; wantedBy = [ "multi-user.target" ]; listenStreams = [ "127.0.0.1:4559" ]; socketConfig.FreeBind = true; socketConfig.Accept = true; }; paths.hylafax-faxq = { description = "HylaFAX queue manager sendq watch"; documentation = [ "man:faxq(8)" "man:sendq(5)" ]; wantedBy = [ "multi-user.target" ]; pathConfig.PathExistsGlob = [ "${cfg.spoolAreaPath}/sendq/q*" ]; }; timers = mkMerge [ ( mkIf (cfg.faxcron.enable.frequency!=null) { hylafax-faxcron.timerConfig.Persistent = true; } ) ( mkIf (cfg.faxqclean.enable.frequency!=null) { hylafax-faxqclean.timerConfig.Persistent = true; } ) ]; hardenService = # Add some common systemd service hardening settings, # but allow each service (here) to override # settings by explicitely setting those to `null`. # More hardening would be nice but makes # customizing hylafax setups very difficult. # If at all, it should only be added along # with some options to customize it. let hardening = { PrivateDevices = true; # breaks /dev/tty... PrivateNetwork = true; PrivateTmp = true; ProtectControlGroups = true; #ProtectHome = true; # breaks custom spool dirs ProtectKernelModules = true; ProtectKernelTunables = true; #ProtectSystem = "strict"; # breaks custom spool dirs RestrictNamespaces = true; RestrictRealtime = true; }; filter = key: value: (value != null) || ! (lib.hasAttr key hardening); apply = service: lib.filterAttrs filter (hardening // (service.serviceConfig or {})); in service: service // { serviceConfig = apply service; }; services.hylafax-spool = { description = "HylaFAX spool area preparation"; documentation = [ "man:hylafax-server(4)" ]; script = '' ${setupSpoolScript} cd "${cfg.spoolAreaPath}" ${cfg.spoolExtraInit} if ! test -f "${cfg.spoolAreaPath}/etc/hosts.hfaxd" then echo hosts.hfaxd is missing exit 1 fi ''; serviceConfig.ExecStop = "${setupSpoolScript}"; serviceConfig.RemainAfterExit = true; serviceConfig.Type = "oneshot"; unitConfig.RequiresMountsFor = [ cfg.spoolAreaPath ]; }; services.hylafax-faxq = { description = "HylaFAX queue manager"; documentation = [ "man:faxq(8)" ]; requires = [ "hylafax-spool.service" ]; after = [ "hylafax-spool.service" ]; wants = mapModems ( { name, ... }: "hylafax-faxgetty@${name}.service" ); wantedBy = mkIf cfg.autostart [ "multi-user.target" ]; serviceConfig.Type = "forking"; serviceConfig.ExecStart = ''${pkgs.hylafaxplus}/spool/bin/faxq -q "${cfg.spoolAreaPath}"''; # This delays the "readiness" of this service until # all modems are initialized (or a timeout is reached). # Otherwise, sending a fax with the fax service # stopped will always yield a failed send attempt: # The fax service is started when the job is created with # `sendfax`, but modems need some time to initialize. serviceConfig.ExecStartPost = [ "${waitFaxqScript}" ]; # faxquit fails if the pipe is already gone # (e.g. the service is already stopping) serviceConfig.ExecStop = ''-${pkgs.hylafaxplus}/spool/bin/faxquit -q "${cfg.spoolAreaPath}"''; # disable some systemd hardening settings serviceConfig.PrivateDevices = null; serviceConfig.RestrictRealtime = null; }; services."hylafax-hfaxd@" = { description = "HylaFAX server"; documentation = [ "man:hfaxd(8)" ]; after = [ "hylafax-faxq.service" ]; requires = [ "hylafax-faxq.service" ]; serviceConfig.StandardInput = "socket"; serviceConfig.StandardOutput = "socket"; serviceConfig.ExecStart = ''${pkgs.hylafaxplus}/spool/bin/hfaxd -q "${cfg.spoolAreaPath}" -d -I''; unitConfig.RequiresMountsFor = [ cfg.userAccessFile ]; # disable some systemd hardening settings serviceConfig.PrivateDevices = null; serviceConfig.PrivateNetwork = null; }; services.hylafax-faxcron = rec { description = "HylaFAX spool area maintenance"; documentation = [ "man:faxcron(8)" ]; after = [ "hylafax-spool.service" ]; requires = [ "hylafax-spool.service" ]; wantedBy = mkIf cfg.faxcron.enable.spoolInit requires; startAt = mkIf (cfg.faxcron.enable.frequency!=null) cfg.faxcron.enable.frequency; serviceConfig.ExecStart = concatStringsSep " " [ "${pkgs.hylafaxplus}/spool/bin/faxcron" ''-q "${cfg.spoolAreaPath}"'' ''-info ${toString cfg.faxcron.infoDays}'' ''-log ${toString cfg.faxcron.logDays}'' ''-rcv ${toString cfg.faxcron.rcvDays}'' ]; }; services.hylafax-faxqclean = rec { description = "HylaFAX spool area queue cleaner"; documentation = [ "man:faxqclean(8)" ]; after = [ "hylafax-spool.service" ]; requires = [ "hylafax-spool.service" ]; wantedBy = mkIf cfg.faxqclean.enable.spoolInit requires; startAt = mkIf (cfg.faxqclean.enable.frequency!=null) cfg.faxqclean.enable.frequency; serviceConfig.ExecStart = concatStringsSep " " [ "${pkgs.hylafaxplus}/spool/bin/faxqclean" ''-q "${cfg.spoolAreaPath}"'' "-v" (optionalString (cfg.faxqclean.archiving!="never") "-a") (optionalString (cfg.faxqclean.archiving=="always") "-A") ''-j ${toString (cfg.faxqclean.doneqMinutes*60)}'' ''-d ${toString (cfg.faxqclean.docqMinutes*60)}'' ]; }; mkFaxgettyService = { name, ... }: lib.nameValuePair "hylafax-faxgetty@${name}" rec { description = "HylaFAX faxgetty for %I"; documentation = [ "man:faxgetty(8)" ]; bindsTo = [ "dev-%i.device" ]; requires = [ "hylafax-spool.service" ]; after = bindsTo ++ requires; before = [ "hylafax-faxq.service" "getty.target" ]; unitConfig.StopWhenUnneeded = true; unitConfig.AssertFileNotEmpty = "${cfg.spoolAreaPath}/etc/config.%I"; serviceConfig.UtmpIdentifier = "%I"; serviceConfig.TTYPath = "/dev/%I"; serviceConfig.Restart = "always"; serviceConfig.KillMode = "process"; serviceConfig.IgnoreSIGPIPE = false; serviceConfig.ExecStart = ''-${pkgs.hylafaxplus}/spool/bin/faxgetty -q "${cfg.spoolAreaPath}" /dev/%I''; # faxquit fails if the pipe is already gone # (e.g. the service is already stopping) serviceConfig.ExecStop = ''-${pkgs.hylafaxplus}/spool/bin/faxquit -q "${cfg.spoolAreaPath}" %I''; # disable some systemd hardening settings serviceConfig.PrivateDevices = null; serviceConfig.RestrictRealtime = null; }; modemServices = lib.listToAttrs (mapModems mkFaxgettyService); in { config.systemd = mkIf cfg.enable { inherit sockets timers paths; services = lib.mapAttrs (lib.const hardenService) (services // modemServices); }; }