Add net-online service

NEWS.md

@@ -3,6 +3,18 @@
 This file will contain a list of notable changes for each release. Note
 the information in this file is in reverse order.
 
+## OpenRC-0.19
+
+This version adds a net-online service. By default, this
+service will check all known network interfaces for a configured
+interface or a carrier. It will register as started only when all
+interfaces are configured and there is at least a carrier on one
+interface. The behaviour of this service can be modified in
+/etc/conf.d/net-online.
+
+Currently, this only works on Linux, but if anyone wants to port to
+*bsd, that would be welcomed.
+
 ## OpenRC-0.18.3
 
 Modern Linux systems expect /etc/mtab to be a symbolic link to

conf.d/Makefile

@@ -15,7 +15,8 @@ include ${MK}/os.mk
 
 CONF-FreeBSD=	ipfw moused powerd rarpd savecore syscons
 
-CONF-Linux=	consolefont devfs dmesg hwclock keymaps killprocs modules mtab
+CONF-Linux=	consolefont devfs dmesg hwclock keymaps killprocs modules mtab \
+	net-online
 
 CONF-NetBSD=	moused rarpd savecore
 

conf.d/net-online

@@ -0,0 +1,15 @@
+# The interfaces setting controls which interfaces the net-online
+# service considers in deciding whether the network is active. By
+# default, it is all ethernet or wireless LAN interfaces.
+#interfaces=""
+
+# This setting controls whether a ping to the default gateway is
+# included in the test for network connectivity after all interfaces
+# are active.
+#ping_default_gateway=no
+
+# The timeout setting controls how long the net-online service waits
+# for the network to be configured.
+# The default is 120 seconds.
+# if this is set to 0, the wait is infinite.
+#timeout=120

init.d/Makefile

@@ -23,7 +23,7 @@ SRCS-FreeBSD+=	adjkerntz.in devd.in dumpon.in encswap.in ipfw.in \
 
 SRCS-Linux=	binfmt.in devfs.in dmesg.in hwclock.in consolefont.in keymaps.in \
 		killprocs.in modules.in mount-ro.in mtab.in numlock.in \
-		procfs.in sysfs.in termencoding.in tmpfiles.dev.in
+		procfs.in net-online.in sysfs.in termencoding.in tmpfiles.dev.in
 
 # Generic BSD scripts
 SRCS-NetBSD=	hostid.in moused.in newsyslog.in pf.in rarpd.in rc-enabled.in \

init.d/net-online.in

@@ -0,0 +1,69 @@
+#!@SBINDIR@/openrc-run
+# Copyright (C) 2015 William Hubbs <w.d.hubbs@gmail.com>
+# Released under the 2-clause BSD license.
+
+description="Delays until the network is online or a specific timeout"
+
+depend()
+{
+	after modules
+	need sysfs
+	keyword -jail -lxc -openvz -prefix -systemd-nspawn -uml -vserver
+}
+
+get_interfaces()
+{
+	local ifname iftype
+	for ifname in /sys/class/net/*; do
+		read iftype < ${ifname}/type
+		[ "$iftype" = "1" ] && printf "%s " ${ifname##*/}
+	done
+}
+
+get_default_gateway()
+{
+	local cmd gateway
+	if command -v ip > /dev/null 2>&1; then
+		cmd="ip route show"
+	else
+		cmd=route
+	fi
+	set -- $($cmd | grep default)
+	[ "$2" != via ] && gateway="$2" || gateway="$3"
+	printf "%s" $gateway
+}
+
+start ()
+{
+	local carriers configured dev gateway ifcount infinite interfaces
+	local rc state timeout x
+
+	ebegin "Checking to see if the network is online"
+	rc=0
+	interfaces=${interfaces:-$(get_interfaces)}
+	timeout=${timeout:-120}
+ [ $timeout -eq 0 ] && infinite=true || infinite=false
+ while $infinite || [ $timeout -gt 0 ]; do
+	carriers=0
+	configured=0
+	ifcount=0
+ 	for dev in ${interfaces}; do
+		: $((ifcount += 1))
+		read x < /sys/class/net/$dev/carrier
+		[ $x -eq 1 ] && : $((carriers += 1))
+		read x < /sys/class/net/$dev/operstate
+		[ "$x" = up ] && : $((configured += 1))
+	done
+	[ $configured -eq $ifcount ] && [ $carriers -ge 1 ] && break
+	sleep 1
+	: $((timeout -= 1))
+ done
+ ! $infinite && [ $timeout -eq 0 ] && rc=1
+ if [ $rc -eq 0 ] && yesno ${ping_default_gateway:-no}; then
+ 	gateway="$(get_default_gateway)"
+ 	if [ -n "$gateway" ] && ! ping -c 1 $gateway > /dev/null 2>&1; then
+		rc=1
+	fi
+ fi
+ eend $rc "The network is offline"
+}