Merge net.OS into net

1 files changed, 221 insertions, 0 deletions

diff --git a/net/clip.sh b/net/clip.sh
new file mode 100644
index 0000000..78344d2
--- /dev/null
+++ b/net/clip.sh
@@ -0,0 +1,221 @@
+# Copyright 2005-2007 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+clip_depend()
+{
+	program /usr/sbin/atmsigd
+    before interface
+}
+
+_config_vars="$_config_vars clip"
+
+# This starts a service. Albeit atmsigd, ilmid and atmarpd do allow for back-
+# grounding through the -b option, its usage causes them to be sensible to
+# SIGHUP, which is sent to all daemons when console detaches right after
+# startup. This is probably due to the fact that these programs don't detach
+# themself from the controlling terminal when backgrounding... The only way I
+# see to overcame this is to use the --background option in start-stop-daemon,
+# which is reported as a "last resort" method, but it acts correctly about this.
+atmclip_svc_start()
+{
+    ebegin "Starting $2 Daemon ($1)"
+    start-stop-daemon --start \
+		--background \
+		--make-pidfile --pidfile "/var/run/$1.pid" \
+		--exec "/usr/sbin/$1" -- -l syslog
+    eend $?
+}
+
+atmclip_svcs_start()
+{
+    einfo "First CLIP instance: starting ATM CLIP daemons"
+    eindent
+
+	if yesno ${clip_full:-yes}; then
+		atmclip_svc_start atmsigd "Signaling" && \
+		atmclip_svc_start ilmid	  "Integrated Local Management Interface" && \
+		atmclip_svc_start atmarpd "Address Resolution Protocol"
+    else
+		atmclip_svc_start atmarpd "Address Resolution Protocol"
+    fi
+
+    local r=$?
+
+    eoutdent
+    return ${r}
+}
+
+atmclip_svc_stop()
+{
+    ebegin "Stopping $2 Daemon ($1)"
+    start-stop-daemon --stop --quiet \
+		--pidfile "/var/run/$1.pid" \
+		--exec "/usr/sbin/$1"
+    eend $?
+}
+
+atmclip_svcs_stop()
+{
+    einfo "Last CLIP instance: stopping ATM CLIP daemons"
+    eindent
+
+    # Heartake operation!
+    sync
+
+    atmclip_svc_stop atmarpd "Address Resolution Protocol"
+	if yesno ${clip_full:-yes}; then
+		atmclip_svc_stop ilmid "Integrated Local Management Interface"
+		atmclip_svc_stop atmsigd "Signaling"
+    fi
+
+    eoutdent
+}
+
+are_atmclip_svcs_running()
+{
+
+	start-stop-daemon --quiet --test --stop --pidfile /var/run/atmarpd.pid || return 1
+
+	if yesno ${clip_full:-yes}; then
+		start-stop-daemon --quiet --test --stop --pidfile /var/run/ilmid.pid || return 1
+		start-stop-daemon --quiet --test --stop --pidfile /var/run/atmsigd.pid || return 1
+	fi
+
+    return 0
+}
+
+clip_pre_start()
+{
+	local clip=
+	eval clip=\$clip_${IFVAR}
+	[ -z "${clip}" ] && return 0
+
+    if [ ! -r /proc/net/atm/arp ]; then
+		modprobe clip && sleep 2
+		if [ ! -r /proc/net/atm/arp ]; then
+	    	eerror "You need first to enable kernel support for ATM CLIP"
+	    	return 1
+		fi
+    fi
+	
+    local started_here=
+    if ! are_atmclip_svcs_running; then
+		atmclip_svcs_start || return 1
+		started_here=1
+    fi
+
+    if ! _exists; then
+		ebegin "Creating CLIP interface ${IFACE}"
+		atmarp -c "${IFACE}"
+		if ! eend $?; then
+			[ -z "${started_here}" ] && atmclip_svcs_stop
+	    	return 1
+		fi
+    fi
+
+    return 0
+}
+
+clip_post_start()
+{
+	local clip="$(_get_array "clip_${IFVAR}")"
+	[ -z "${clip}" ] && return 0
+
+	are_atmclip_svcs_running || return 1
+
+    # The atm tools (atmarpd?) are silly enough that they would not work with
+    # iproute2 interface setup as opposed to the ifconfig one.
+    # The workaround is to temporarily toggle the interface state from up
+    # to down and then up again, without touching its address. This (should)
+    # work with both iproute2 and ifconfig.
+    _down
+    _up
+
+    # Now the real thing: create a PVC with our peer(s).
+    # There are cases in which the ATM interface is not yet
+    # ready to establish new VCCs. In that cases, atmarp would
+    # fail. Here we allow 10 retries to happen every 2 seconds before
+    # reporting problems. Also, when no defined VC can be established,
+    # we stop the ATM daemons.
+    local has_failures= i=
+	for i in ${clip}; do
+		local IFS=","
+		set -- ${i}
+		unset IFS
+		local peerip="$1"; shift
+		local ifvpivci="$1"; shift
+		ebegin "Creating PVC ${ifvpivci} for peer ${peerip}"
+
+		local nleftretries=10 emsg= ecode=
+		while [ ${nleftretries} -gt 0 ]; do
+			nleftretries=$((${nleftretries} - 1))
+	    	emsg="$(atmarp -s "${peerip}" "${ifvpivci}" "$@" 2>&1)"
+	    	ecode=$? && break
+	    	sleep 2
+		done
+
+		if ! eend ${ecode}; then
+	    	eerror "Creation failed for PVC ${ifvpivci}: ${emsg}"
+	    	has_failures=1
+		fi
+    done
+
+    if [ -n "${has_failures}" ]; then
+		clip_pre_stop "${iface}"
+		clip_post_stop "${iface}"
+		return 1
+    else
+		return 0
+    fi
+}
+
+clip_pre_stop()
+{
+    are_atmclip_svcs_running || return 0
+
+	# We remove all the PVCs which may have been created by
+	# clip_post_start for this interface. This shouldn't be
+	# needed by the ATM stack, but sometimes I got a panic
+	# killing CLIP daemons without previously vacuuming
+	# every active CLIP PVCs.
+	# The linux 2.6's ATM stack is really a mess...
+	local itf= t= encp= idle= ipaddr= left=
+	einfo "Removing PVCs on this interface"
+	eindent
+	{
+		read left && \
+		while read itf t encp idle ipaddr left; do
+			if [ "${itf}" = "${IFACE}" ]; then
+				ebegin "Removing PVC to ${ipaddr}"
+				atmarp -d "${ipaddr}"
+				eend $?
+			fi
+		done
+	} < /proc/net/atm/arp
+	eoutdent
+}
+
+# Here we should teorically delete the interface previously created in the
+# clip_pre_start function, but there is no way to "undo" an interface creation.
+# We can just leave the interface down. "ifconfig -a" will still list it...
+# Also, here we can stop the ATM CLIP daemons if there is no other CLIP PVC
+# outstanding. We check this condition by inspecting the /proc/net/atm/arp file.
+clip_post_stop()
+{
+    are_atmclip_svcs_running || return 0
+
+    local itf= left= hasothers=
+    {
+		read left && \
+		while read itf left; do
+	    	if [ "${itf}" != "${IFACE}" ]; then
+				hasothers=1
+				break
+	    	fi
+		done
+    } < /proc/net/atm/arp
+
+    if [ -z "${hasothers}" ]; then
+		atmclip_svcs_stop || return 1
+    fi
+}