contrib/package: Add freifunk-gwcheck to replace the gateway-check in modules/freifunk

1 files changed, 82 insertions, 0 deletions

diff --git a/contrib/package/freifunk-gwcheck/files/usr/sbin/ff_olsr_test_gw.sh b/contrib/package/freifunk-gwcheck/files/usr/sbin/ff_olsr_test_gw.sh
new file mode 100755
index 0000000000..5d34d9a559
--- /dev/null
+++ b/contrib/package/freifunk-gwcheck/files/usr/sbin/ff_olsr_test_gw.sh
@@ -0,0 +1,82 @@
+#!/bin/sh
+
+#check if dyngw_plain is installed and enabled, else exit
+dyngwplainlib=`uci show olsrd |grep dyn_gw_plain |awk {' FS="."; print $1"."$2 '}`
+if [ -n "$dyngwplainlib" ]; then
+	if [ ! "$(uci -q get $dyngwplainlib.ignore)" == 0 ]; then
+		exit 1
+	fi
+else
+	echo "dyngw_plain not found in olsrd config, exit"
+	exit 1
+fi
+
+
+# check if we have a defaultroute with metric=0 in one of these tables: main table and gw-check table.
+# If not exit here.
+defroutemain="$(ip r s |grep default |grep -v metric)"
+defroutegw-check="$(ip r s t gw-check |grep default |grep -v metric)"
+if [ -z "$defroutegw-check" -a -z "$defroutemain" ]; then
+	exit 1
+fi
+
+# get and shuffle list of testservers
+testserver="$(uci -q get freifunk-gwcheck.hosts.host)"
+[ -z "$testserver" ] && echo "No testservers found, exit" && exit 
+
+testserver="$(for t in $testserver; do echo $t; done | awk 'BEGIN {
+	srand();
+}
+{
+	l[NR] = $0;
+}
+
+END {
+	for (i = 1; i <= NR; i++) {
+		n = int(rand() * (NR - i + 1)) + i;
+		print l[n];
+		l[n] = l[i];
+	}
+}')"
+
+check_internet() {
+	for t in $testserver; do
+		local test
+		test=$(wget -q http://$t/conntest.html -O -| grep "Internet_works")
+		if [ "$test" == "Internet_works" ]; then
+			echo 0
+			break
+		else
+			logger -t gw-check "Could not get test file from http://$t/conntest.html"
+		fi
+	done
+}
+
+iw=$(check_internet)
+
+if [ "$iw" == 0 ]; then
+	# check if we have a seperate routing table for our tests.
+	# If yes, move defaultroute to normal table and delete table gw-check
+	if [ -n "$defroutegw-check" ]; then
+		ip r a $defroutegw-check
+		ip r d $defroutegw-check t gw-check
+		ip ru del fwmark 0x2 lookup gw-check
+		for host in $testserver; do
+			iptables -t mangle -D OUTPUT -d $host -p tcp --dport 80 -j MARK --set-mark 0x2
+		done
+		logger -t gw-check "Internet is available again, restoring default route ( $defroutegw-check)"
+	fi
+	
+else
+	# Check failed. If we have a defaultroute with metric=0 and it is already in table gw-check then do nothing.
+	# If there is a defaultroute with metric=0 then remove it from the main routing table and add to table gw-check.
+	if [ -z "$(ip ru s | grep gw-check)" -a -n "$defroutemain" ]; then
+		ip rule add fwmark 0x2 lookup gw-check
+		for host in $testserver; do
+			iptables -t mangle -I OUTPUT -d $host -p tcp --dport 80 -j MARK --set-mark 0x2
+		done
+		ip r a $defroutemain table gw-check
+		ip r d $defroutemain
+		logger -t gw-check "Internet is not available, deactivating the default route ( $defroutemain)"
+	fi
+fi