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authorManuel Munz <freifunk@somakoma.de>2011-09-23 19:23:18 +0000
committerManuel Munz <freifunk@somakoma.de>2011-09-23 19:23:18 +0000
commitd8e4734b23016cea5c5099f84a7f2ffbab8e6216 (patch)
treecb1f06928a006357b7e0a532dd0765dc76ffc87d /contrib/package/freifunk-gwcheck/files
parent9ed39e1431395bb84c486df94bc0a3660d7f0936 (diff)
contrib/package: Add freifunk-gwcheck to replace the gateway-check in modules/freifunk
Diffstat (limited to 'contrib/package/freifunk-gwcheck/files')
-rw-r--r--contrib/package/freifunk-gwcheck/files/etc/config/freifunk-gwcheck5
-rwxr-xr-xcontrib/package/freifunk-gwcheck/files/usr/sbin/ff_olsr_test_gw.sh82
2 files changed, 87 insertions, 0 deletions
diff --git a/contrib/package/freifunk-gwcheck/files/etc/config/freifunk-gwcheck b/contrib/package/freifunk-gwcheck/files/etc/config/freifunk-gwcheck
new file mode 100644
index 000000000..382747e20
--- /dev/null
+++ b/contrib/package/freifunk-gwcheck/files/etc/config/freifunk-gwcheck
@@ -0,0 +1,5 @@
+config 'gwcheck' 'hosts'
+ list 'host' 'augsburg.freifunk.net'
+ list 'host' 'vpn4.leipzig.freifunk.net'
+ list 'host' 'luci.subsignal.org'
+ list 'host' 'conntest.jpod.cc'
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 000000000..5d34d9a55
--- /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