From 71a2425ed95120a6de3a41bb233b1066779d4c26 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Isma=C3=ABl=20Bouya?= <ismael.bouya@normalesup.org>
Date: Fri, 17 Jan 2020 01:15:04 +0100
Subject: Add e-mail checks monitoring

---
 modules/private/mail/postfix.nix | 36 +++++++++++++++++++++++++++++++++---
 modules/private/mail/relay.nix   |  6 +++++-
 2 files changed, 38 insertions(+), 4 deletions(-)

(limited to 'modules/private/mail')

diff --git a/modules/private/mail/postfix.nix b/modules/private/mail/postfix.nix
index 8fe06da..51f4de7 100644
--- a/modules/private/mail/postfix.nix
+++ b/modules/private/mail/postfix.nix
@@ -1,4 +1,4 @@
-{ lib, pkgs, config, nodes, name, ... }:
+{ lib, pkgs, config, nodes, ... }:
 {
   config = lib.mkIf config.myServices.mail.enable {
     services.duplyBackup.profiles.mail.excludeFile = ''
@@ -220,7 +220,13 @@
           '';
         scripts = lib.attrsets.mapAttrs (n: v:
           toScript n (pkgs.callPackage (builtins.fetchGit { url = v.src.url; ref = "master"; rev = v.src.rev; }) { scriptEnv = v.env; })
-        ) config.myEnv.mail.scripts;
+        ) config.myEnv.mail.scripts // {
+          testmail = pkgs.writeScript "testmail" ''
+            #! ${pkgs.stdenv.shell}
+            ${pkgs.coreutils}/bin/touch \
+              "/var/lib/naemon/checks/email/$(${pkgs.procmail}/bin/formail -x To: | ${pkgs.coreutils}/bin/tr -d ' <>')"
+            '';
+        };
       in builtins.concatStringsSep "\n" (lib.attrsets.mapAttrsToList (n: v: ''${n}: "|${v}"'') scripts);
       mapFiles = let
         recipient_maps = let
@@ -246,8 +252,12 @@
           ) config.myEnv.mail.postfix.backup_domains
         );
         virtual_map = {
-          virtual = pkgs.writeText "postfix-virtual" (
+          virtual = let
+            cfg = config.myEnv.monitoring.email_check.eldiron;
+            address = "${cfg.mail_address}@${cfg.mail_domain}";
+          in pkgs.writeText "postfix-virtual" (
             builtins.concatStringsSep "\n" (
+              ["${address} testmail@localhost"] ++
               lib.attrsets.mapAttrsToList (
                 n: v: lib.optionalString v.external ''
                   script_${n}@mail.immae.eu ${n}@localhost, scripts@mail.immae.eu
@@ -425,5 +435,25 @@
         "smtp.immae.eu" = null;
       };
     };
+    system.activationScripts.testmail = {
+      deps = [ "users" ];
+      text = let
+        allCfg = config.myEnv.monitoring.email_check;
+        cfg = allCfg.eldiron;
+        reverseTargets = builtins.attrNames (lib.attrsets.filterAttrs (k: v: builtins.elem "eldiron" v.targets) allCfg);
+        to_email = cfg': host':
+          let sep = if lib.strings.hasInfix "+" cfg'.mail_address then "_" else "+";
+          in "${cfg'.mail_address}${sep}${host'}@${cfg'.mail_domain}";
+        mails_to_receive = builtins.concatStringsSep " " (map (to_email cfg) reverseTargets);
+      in ''
+        install -m 0555 -o nobody -g nogroup -d /var/lib/naemon/checks/email
+        for f in ${mails_to_receive}; do
+          if [ ! -f /var/lib/naemon/checks/email/$f ]; then
+            install -m 0644 -o nobody -g nogroup /dev/null -T /var/lib/naemon/checks/email/$f
+            touch -m -d @0 /var/lib/naemon/checks/email/$f
+          fi
+        done
+        '';
+    };
   };
 }
diff --git a/modules/private/mail/relay.nix b/modules/private/mail/relay.nix
index e0aa387..6ac3df8 100644
--- a/modules/private/mail/relay.nix
+++ b/modules/private/mail/relay.nix
@@ -126,8 +126,12 @@
           ) config.myEnv.mail.postfix.backup_domains
         );
         virtual_map = {
-          virtual = pkgs.writeText "postfix-virtual" (
+          virtual = let
+            cfg = config.myEnv.monitoring.email_check.eldiron;
+            address = "${cfg.mail_address}@${cfg.mail_domain}";
+          in pkgs.writeText "postfix-virtual" (
             builtins.concatStringsSep "\n" (
+              ["${address} 1"] ++
               lib.attrsets.mapAttrsToList (
                 n: v: lib.optionalString v.external ''
                   script_${n}@mail.immae.eu 1
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