Implement support for logging configuration

Adds `bind::logging::channel` and `bind::logging::category` defines in order to
support logging configuration.

manifests/defaults.pp

@@ -5,6 +5,7 @@ class bind::defaults (
     $confdir                = undef,
     $namedconf              = undef,
     $cachedir               = undef,
+    $logdir                 = undef,
     $random_device          = undef,
     $bind_user              = undef,
     $bind_group             = undef,

manifests/init.pp

@@ -79,6 +79,7 @@ class bind (
         "${confdir}/keys.conf",
         "${confdir}/views.conf",
         "${confdir}/servers.conf",
+        "${confdir}/logging.conf",
         "${confdir}/view-mappings.txt",
         "${confdir}/domain-mappings.txt",
         ]:
@@ -90,6 +91,18 @@ class bind (
         notify  => Service['bind'],
     }
 
+    concat::fragment { 'bind-logging-header':
+        order   => "00-header",
+        target  => "${confdir}/logging.conf",
+        content => "logging {\n";
+    }
+
+    concat::fragment { 'bind-logging-footer':
+        order   => "99-footer",
+        target  => "${confdir}/logging.conf",
+        content => "};\n";
+    }
+
     service { 'bind':
         ensure     => running,
         name       => $bind_service,

manifests/logging/category.pp

@@ -0,0 +1,11 @@
+# ex: syntax=puppet si ts=4 sw=4 et
+
+define bind::logging::category (
+	$channels
+) {
+    concat::fragment { "bind-logging-category-${name}":
+        order   => "60-${name}",
+        target  => "${::bind::confdir}/logging.conf",
+        content => inline_template("\tcategory <%= @name %> {\n<% Array(@channels).each { |c| %>\t\t<%= c %>;\n<% } %>\t};\n"),
+    }
+}

manifests/logging/channel.pp

@@ -0,0 +1,49 @@
+# ex: syntax=puppet si ts=4 sw=4 et
+
+define bind::logging::channel (
+    $destination     = 'file',
+    $file_path       = $::bind::defaults::logdir,
+    $file_name       = '',
+    $syslog_facility = '',
+    $severity        = '',
+    $print_category  = true,
+    $print_severity  = true,
+    $print_time      = true,
+) {
+    unless member(['file', 'syslog', 'stderr', 'null'], $destination) {
+        fail("Bind::logging::channel[${name}] has invalid destination: ${destionation}. Must be one of: file syslog stderr null")
+    }
+
+    if $destination == 'file' {
+        unless defined(File[$file_path]) {
+            file { $file_path:
+                ensure => directory,
+                owner  => $::bind::bind_user,
+                group  => $::bind::bind_group,
+                mode   => '0640',
+            }
+        }
+
+        if $file_name == '' {
+            fail("Bind::logging::channel[${name}] must specify file_name when using file destination")
+        }
+    }
+
+    if $destination == 'syslog' {
+        unless member(['AUTH', 'AUTHPRIV', 'CRON', 'DAEMON', 'FTP', 'KERN', 'LOCAL0',
+                'LOCAL1', 'LOCAL2', 'LOCAL3', 'LOCAL4', 'LOCAL5', 'LOCAL6', 'LOCAL7',
+                'LPR', 'MAIL', 'NEWS', 'SYSLOG', 'USER', 'UUCP'], $syslog_facility) {
+            file("Bind::logging::channell[${name}] has invalid syslog_facility: ${syslog_facility}.")
+        }
+    }
+
+    unless $severity == '' or member(['critical', 'error', 'warning', 'notice', 'info', 'debug', 'dynamic'], $severity) {
+        fail("Bind::logging::channel[${name}] has invalid severity: ${severity}")
+    }
+
+    concat::fragment { "bind-logging-channel-${name}":
+        order   => "40-${name}",
+        target  => "${::bind::confdir}/logging.conf",
+        content => template('bind/logging_channel.erb'),
+    }
+}