contrib/freifunk-gwcheck: check which interface is wan when we get the upstream dns servers, add priorities to logger calls, check for dyngw_plain plugin before checking if script already runs, add license/copyright
This commit is contained in:
Manuel Munz
parent
b59375ccc5
commit
c9525b9b22
1 changed files with 28 additions and 38 deletions
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@ -1,28 +1,28 @@
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#!/bin/sh
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# Copyright 2013 Manuel Munz <freifunk at somakoma dot de>
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# Licensed under the GNU General Public License (GPL) v3
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# This script monitors the local internet gateway
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. /lib/functions/network.sh
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# exit if dyngw_plain is not installed or enabled
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dgwlib=`uci show olsrd |grep dyn_gw_plain |awk {' FS="."; print $1"."$2 '}`
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if [ -n "$dgwlib" ]; then
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if [ "$(uci -q get $dgwlib.ignore)" == 1 ]; then
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exit 1
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fi
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else
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exit 1
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fi
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#Exit if this script is already running
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pid="$(pidof ff_olsr_test_gw.sh)"
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if [ ${#pid} -gt 5 ]; then
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logger -t gwcheck "Gateway check script is already running, exit now"
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logger -p debug -t gwcheck "Gateway check script is already running, exit now"
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exit 1
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fi
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#check if dyngw_plain is installed and enabled, else exit
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dyngwplainlib=`uci show olsrd |grep dyn_gw_plain |awk {' FS="."; print $1"."$2 '}`
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if [ -n "$dyngwplainlib" ]; then
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if [ "$(uci -q get $dyngwplainlib.ignore)" == 1 ]; then
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exit 1
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fi
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else
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echo "dyngw_plain not found in olsrd config, exit"
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exit 1
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fi
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# check if we have a defaultroute with metric=0 in one of these tables: main table and gw-check table.
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# If not exit here.
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# exit if there is no defaultroute with metric=0 in main or gw-check table.
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defroutemain="$(ip r s |grep default |grep -v metric)"
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defroutegwcheck="$(ip r s t gw-check |grep default |grep -v metric)"
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if [ -z "$defroutegwcheck" -a -z "$defroutemain" ]; then
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@ -56,7 +56,7 @@ check_internet() {
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echo 0
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break
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else
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logger -t gw-check "Could not get test file from http://$t/conntest.html"
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logger -p debug -t gw-check "Could not fetch http://$t/conntest.html"
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fi
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done
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}
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@ -66,54 +66,45 @@ resolve() {
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}
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get_dnsservers() {
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# this gets all dns servers for the wan interface. If ubus is not present (like on older
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# openwrt versions before Attitude fallback to get these from /var/state/network.
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# this gets all dns servers for the interface which has the default route
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dns=""
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if [ -x /bin/ubus ]; then
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network_get_dnsserver dns wan
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else
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if [ ! -x /bin/ubus ]; then
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# ubus not present (versions before Attitude): fallback to get these from /var/state/network.
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# We always assume that wan is the default route interface here
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dns="$(grep network.wan.resolv_dns /var/state/network | cut -d "=" -f 2)"
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else
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network_find_wan wan
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network_get_dnsserver dns $wan
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fi
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}
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iw=$(check_internet)
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if [ "$iw" == 0 ]; then
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# check if we have a seperate routing table for our tests.
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# If yes, move defaultroute to normal table and delete table gw-check
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# Also delete ip rules to use table gw-check for our testhosts and wan dns servers
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# Internet available again, restore default route and remove ip rules
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if [ -n "$defroutegwcheck" ]; then
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ip r a $defroutegwcheck
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ip r d $defroutegwcheck t gw-check
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ip ru del fwmark 0x2 lookup gw-check
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for host in $testserver; do
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ips="$(resolve $host)"
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for ip in $ips; do
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[ -n "$(ip ru s | grep "to $ip lookup gw-check")" ] && ip rule del to $ip table gw-check
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done
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done
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get_dnsservers
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for d in $dns; do
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[ -n "$(ip ru s | grep "to $d lookup gw-check")" ] && ip rule del to $d table gw-check
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done
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#ip r d default via 127.0.0.1 metric 100000
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logger -t gw-check "Internet is available again, restoring default route ( $defroutegwcheck)"
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logger -p err -t gw-check "Internet is available again, default route restored ( $defroutegwcheck)"
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fi
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else
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# Check failed. If we have a defaultroute with metric=0 and it is already in table gw-check then do nothing.
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# If there is a defaultroute with metric=0 then remove it from the main routing table and add to table gw-check.
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# Also setup ip rules to use table gw-check for our testhosts and wan dns servers
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# Check failed. Move default route to table gw-check and setup ip rules.
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if [ -z "$(ip ru s | grep gw-check)" -a -n "$defroutemain" ]; then
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ip rule add fwmark 0x2 lookup gw-check
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ip r a $defroutemain table gw-check
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ip r d $defroutemain
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logger -p err -t gw-check "Internet is not available, default route deactivated ( $defroutemain)"
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fi
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for host in $testserver; do
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ips="$(resolve $host)"
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@ -125,6 +116,5 @@ else
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for d in $dns; do
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[ -z "$(ip ru s | grep "to $d lookup gw-check")" ] && ip rule add to $d table gw-check
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done
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#ip r a default via 127.0.0.1 metric 100000
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logger -t gw-check "Internet is not available, deactivating the default route ( $defroutemain)"
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logger -p err -t gw-check "Check your internet connection!"
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fi
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