Add a logger_debug function

DNSCrypt-Preference-Pane/DNSCrypt/extra/usr/scripts/common.inc

@@ -1,27 +1,33 @@
 DNSCRYPT_USR_BASE_DIR='/Library/PreferencePanes/DNSCrypt.prefPane/Contents/Resources/usr'
 DNSCRYPT_VAR_BASE_DIR='/Library/Application Support/DNSCrypt'
 DNSCRYPT_LOG_BASE_DIR='/var/log'
+DNSCRYPT_VAR_RUN_BASE_DIR='/var/run'
 
 cd -- "${DNSCRYPT_USR_BASE_DIR}/scripts" || exit 1
 
 CONTROL_DIR="${DNSCRYPT_VAR_BASE_DIR}/control"
 TICKETS_DIR="${DNSCRYPT_VAR_BASE_DIR}/tickets"
 DNSCRYPT_PROXY_BASE_DIR="${DNSCRYPT_VAR_BASE_DIR}/dnscrypt-proxy"
-PROXY_PID_FILE="/var/run/dnscrypt-proxy.pid"
+PROXY_PID_FILE="${DNSCRYPT_VAR_RUN_BASE_DIR}/dnscrypt-proxy.pid"
 STATES_DIR="${DNSCRYPT_VAR_BASE_DIR}/states"
 
 DNSCRYPT_RESOLVER_NAME_FILE="${CONTROL_DIR}/dnscrypt-resolver-name"
 DNSCRYPT_FILE="${CONTROL_DIR}/dnscrypt"
 FALLBACK_FILE="${CONTROL_DIR}/fallback"
-HANDLERS_LOCK_FILE="/var/run/dnscrypt-handlers.lock"
+HANDLERS_LOCK_FILE="${DNSCRYPT_VAR_RUN_BASE_DIR}/dnscrypt-handlers.lock"
 DNSCRYPT_PROXY_PLUGINS_BASE_FILE="${CONTROL_DIR}/plugin"
 STATIC_RESOLVERS_FILE="${CONTROL_DIR}/static-resolvers"
 
+DEBUG_ENABLED_FILE="${CONTROL_DIR}/debug.enabled"
+DEBUG_ENABLED_FILE_LOCK="${DEBUG_ENABLED_FILE}.lock"
+
 PLUGINS_ENABLED_FILE="${CONTROL_DIR}/plugins.enabled"
 QUERY_LOGGING_FILE="${CONTROL_DIR}/plugin-query-logging.enabled"
 BLOCKING_FILE="${CONTROL_DIR}/plugin-blocking.enabled"
 
 QUERY_LOG_FILE="${DNSCRYPT_LOG_BASE_DIR}/dnscrypt-query.log"
+DEBUG_LOG_FILE="${DNSCRYPT_LOG_BASE_DIR}/dnscrypt-osxclient-debug.log"
+
 BLACKLIST_IPS_FILE="${CONTROL_DIR}/blacklist-ips"
 BLACKLIST_IPS_TMP_FILE="${BLACKLIST_IPS_FILE}.tmp"
 BLACKLIST_DOMAINS_FILE="${CONTROL_DIR}/blacklist-domains"
@@ -51,3 +57,12 @@ init_interfaces() {
   /sbin/ifconfig lo0 alias ${INTERFACE_PROXY}/${INTERFACE_PROXY_MASK}
   /sbin/ifconfig lo0 alias ${INTERFACE_PROBES}/${INTERFACE_PROBES_MASK}
 }
+
+logger_debug() {
+  [ -f "$DEBUG_ENABLED_FILE" ] || return
+  local msg="$1"
+  local now="$(date)"
+  lockfile "$DEBUG_ENABLED_FILE_LOCK" -r 1 -l 10
+  echo "$now - $msg" >> "$DEBUG_ENABLED_FILE"
+  rm -f "$DEBUG_ENABLED_FILE_LOCK"
+}