Add networking hooks for udhcpd

3 files changed, 104 insertions, 0 deletions

diff --git a/src.etc/network/functions b/src.etc/network/functions
new file mode 100644
index 0000000..b74fb91
--- /dev/null
+++ b/src.etc/network/functions
@@ -0,0 +1,41 @@
+#!/bin/sh
+
+case "${0}" in
+	/etc/network/if-*.d/*) ;;
+	*) exit 1;;
+esac
+if [ "x${IFACE}" = 'x' ]; then
+	exit 1
+fi
+
+get_iface_opts()
+{
+	local opts_start_cb="${1}"
+	local opt_cb="${2}"
+	local opts_end_cb="${3}"
+	local script=
+	local opts=
+	local opt=
+
+	script="$(printf '
+		/^iface[ \\t][ \\t]*%s/,/^[^ \\t]/{
+			/^$/q;
+			s/^[ \\t][ \\t]*//p;
+		}
+		' "${IFACE}")"
+
+	opts="$(sed -n "${script}" /var/run/net-ifaces)"
+	if [ "x${opts}" = 'x' ]; then
+		return 0
+	fi
+
+	${opts_start_cb}
+	while read -r opt; do
+		${opt_cb} ${opt}
+	done <<-EOF
+		${opts}
+		EOF
+	${opts_end_cb}
+
+	return 0
+}
diff --git a/src.etc/network/if-down.d/dhcpd b/src.etc/network/if-down.d/dhcpd
new file mode 100644
index 0000000..b6ca719
--- /dev/null
+++ b/src.etc/network/if-down.d/dhcpd
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -eu
+
+if [ -f "/var/run/udhcpd.${IFACE}" ]; then
+	kill "$(cat "/var/run/udhcpd.${IFACE}")"
+fi
diff --git a/src.etc/network/if-up.d/dhcpd b/src.etc/network/if-up.d/dhcpd
new file mode 100644
index 0000000..5fcc18e
--- /dev/null
+++ b/src.etc/network/if-up.d/dhcpd
@@ -0,0 +1,56 @@
+#!/bin/sh
+
+. /etc/network/functions
+
+set -eu
+
+address=
+subnet=
+gateway=
+
+dhcpd_opts_start_cb()
+{
+	exec 3>"/var/run/udhcpd.${IFACE}.conf"
+	printf 'interface %s\n' "${IFACE}" >&3
+	printf 'pidfile /var/run/udhcpd.%s.pid\n' "${IFACE}" >&3
+	printf 'lease_file /var/lib/misc/udhcpd.%s.leases\n' "${IFACE}" >&3
+}
+
+dhcpd_opt_cb()
+{
+	local key="${1}"
+	shift 1
+	local val="${*}"
+
+	case "${key}" in
+		dhcpd-*)
+			key="$(printf '%s\n' "${key#dhcpd-}" | tr '-' '_')"
+			printf '%s %s\n' "${key}" "${val}" >&3
+			;;
+		address)
+			address="${val}"
+			;;
+		subnet)
+			subnet="${val}"
+			;;
+		gateway)
+			gateway="${val}"
+			;;
+	esac
+}
+
+dhcpd_opts_end_cb()
+{
+	printf 'option subnet %s\n' "${subnet}" >&3
+	if [ "x${gateway}" != 'x' ]; then
+		printf 'option router %s\n' "${gateway}" >&3
+	else
+		printf 'option router %s\n' "${address}" >&3
+	fi
+	sed 's/nameserver/option dns/' /etc/resolv.conf >&3
+	exec &3>-
+
+	udhcpd -S "/var/run/udhcpd.${IFACE}.conf"
+}
+
+get_iface_opts dhcpd_opts_start_cb dhcpd_opt_cb dhcpd_opts_end_cb