1 files changed, 156 insertions, 0 deletions
diff --git a/libexec/rc/rc.d/netwait b/libexec/rc/rc.d/netwait
new file mode 100755
index 000000000000..05874552cf1c
--- /dev/null
+++ b/libexec/rc/rc.d/netwait
@@ -0,0 +1,156 @@
+#!/bin/sh
+#
+# PROVIDE: netwait
+# REQUIRE: devd ipfw pf routing
+#
+# The netwait script helps handle three situations:
+#  - Systems with USB or other late-attaching network hardware which
+#    is initialized by devd events.  The script waits for all the
+#    interfaces named in the netwait_if list to appear.
+#  - Systems with IPv6 addresses, especially jails, where we need to
+#    wait for DAD to complete before starting daemons, as they will
+#    otherwise fail to bind to IN6ADDR_ANY.
+#  - Systems with statically-configured IP addresses in rc.conf(5).
+#    The IP addresses in the netwait_ip list are pinged.  The script
+#    waits for any single IP in the list to respond to the ping.  If your
+#    system uses DHCP, you should probably use synchronous_dhclient="YES"
+#    in your /etc/rc.conf instead of netwait_ip.
+# Either or both of the wait lists can be used (at least one must be
+# non-empty if netwait is enabled).
+
+. /etc/rc.subr
+
+name="netwait"
+desc="Wait for network devices or the network being up"
+rcvar="netwait_enable"
+
+start_cmd="${name}_start"
+stop_cmd=":"
+
+netwait_start()
+{
+	local ip rc count output link wait_if got_if any_error
+
+	if [ -z "${netwait_if}" ] && [ -z "${netwait_ip}" ] &&
+	   ! checkyesno netwait_dad ; then
+		err 1 "Nothing to wait for"
+	fi
+
+	if ! [ "${netwait_if_timeout:=0}" -ge 1 ]; then
+		err 1 "netwait_if_timeout must be >= 1"
+	fi
+	if ! check_kern_features inet6; then
+		netwait_dad="NO"
+	elif ! [ "${netwait_dad_timeout:=0}" -ge 1 ]; then
+		netwait_dad_timeout=$(($(sysctl -n net.inet6.ip6.dad_count)+1))
+	fi
+	if ! [ "${netwait_timeout:=0}" -ge 1 ]; then
+		err 1 "netwait_timeout must be >= 1"
+	fi
+
+	any_error=false
+
+	if [ -n "${netwait_if}" ]; then
+		for wait_if in ${netwait_if}; do
+			echo -n "Waiting for ${wait_if}"
+			link=""
+			got_if=false
+			count=1
+			# Handle SIGINT (Ctrl-C); force abort of while loop
+			trap break SIGINT
+			while [ ${count} -le ${netwait_if_timeout} ]; do
+				if output=`/sbin/ifconfig ${wait_if} 2>/dev/null`; then
+					if ! ${got_if}; then
+						echo -n ", interface present"
+						got_if=true
+					fi
+					link=`expr "${output}" : '.*[[:blank:]]status: \(no carrier\)'`
+					if [ -z "${link}" ]; then
+						echo ', got link.'
+						break
+					fi
+				fi
+				sleep 1
+				count=$((count+1))
+			done
+			# Restore default SIGINT handler
+			trap - SIGINT
+			if ! ${got_if}; then
+				echo ", wait failed: interface never appeared."
+				any_error=true
+			elif [ -n "${link}" ]; then
+				echo ", wait failed: interface still has no link."
+				any_error=true
+			fi
+		done
+	fi
+	
+	if checkyesno netwait_dad; then
+		got_dad=false
+		# Handle SIGINT (Ctrl-C); force abort of while loop
+		trap break SIGINT
+
+		echo -n "Waiting for DAD to complete"
+		count=1
+		while [ ${count} -le ${netwait_dad_timeout} ]; do
+			if ! ifconfig | grep -q 'inet6.*tentative'; then
+				echo ', done.'
+				got_dad=true
+				break
+			fi
+			sleep 1
+			count=$((count+1))
+		done
+
+		# Restore default SIGINT handler
+		trap - SIGINT
+
+		if ! ${got_dad}; then
+			echo ', timed out.'
+			any_error=true
+		fi
+	fi
+
+	if [ -n "${netwait_ip}" ]; then
+		got_ip=false
+		# Handle SIGINT (Ctrl-C); force abort of for loop
+		trap break SIGINT
+
+		for ip in ${netwait_ip}; do
+			echo -n "Waiting for ${ip} to respond to ICMP ping"
+
+			count=1
+			while [ ${count} -le ${netwait_timeout} ]; do
+				/sbin/ping -t 1 -c 1 -o ${ip} >/dev/null 2>&1
+				rc=$?
+
+				if [ $rc -eq 0 ]; then
+					echo ', got response.'
+					got_ip=false
+					break 2
+				fi
+				count=$((count+1))
+			done
+			echo ', failed: No response from host.'
+		done
+
+		# Restore default SIGINT handler
+		trap - SIGINT
+
+		if ! ${got_ip}; then
+			any_error=true
+		fi
+	fi
+
+	if ${any_error}; then
+		warn "Continuing with startup, but be aware you may not have "
+		warn "a fully functional networking layer at this point."
+	fi
+}
+
+load_rc_config $name
+
+# doesn't make sense to run in a svcj: config setting
+netwait_svcj="NO"
+
+run_rc_command "$1"