+_dropbearkey()
+{
+ /usr/bin/dropbearkey "$@" 0<&- 1>&- 2>&-
+}
+
+# $1 - host key file name
+hk_verify()
+{
+ [ -f "$1" ] || return 1
+ [ -s "$1" ] || return 2
+ _dropbearkey -y -f "$1" || return 3
+ return 0
+}
+
+# $1 - hk_verify() return code
+hk_errmsg()
+{
+ case "$1" in
+ 0) ;;
+ 1) echo "file does not exist" ;;
+ 2) echo "file has zero length" ;;
+ 3) echo "file is not valid host key or not supported" ;;
+ *) echo "unknown error" ;;
+ esac
+}
+
+# $1 - config option
+# $2 - host key file name
+hk_config()
+{
+ local x m
+ hk_verify "$2"; x=$?
+ case "$x" in
+ 0) procd_append_param command -r "$2"
+ ;;
+ *) m=$(hk_errmsg "$x")
+ logger -t "${NAME}" -p daemon.warn \
+ "option '$1', value '$2': $m, skipping"
+ ;;
+ esac
+}
+
+# $1 - host key file name
+hk_config__keyfile()
+{
+ hk_config 'keyfile' "$1"
+}
+