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Test two tinc daemons using network namespaces.

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Testing multiple daemons connecting to each other on the same computer is
usually difficult, because connections to local IP addresses will bypass most
of the network stack. However, recent versions of Linux support network
namespaces, which can isolate network interfaces. We use this to isolate the
virtual interface of the daemons from each other, so we get the behaviour as if
the daemons were each running on their own machine. This can also be used for
more complicated tests (including those with firewall rules) without disturbing
the real network setup of the host computer.
This commit is contained in:
Guus Sliepen 2014-01-24 16:09:32 +01:00
parent 38adc8bf54
commit fa1e9b0461
2 changed files with 71 additions and 0 deletions
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1
test/Makefile.am
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@ -4,6 +4,7 @@ TESTS = \
executables.test \
import-export.test \
invite-join.test \
ns-ping.test \
ping.test \
sptps-basic.test \
variables.test

70
test/ns-ping.test Executable file
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@ -0,0 +1,70 @@
#!/bin/sh
. ./testlib.sh
# Skip this test if we aren't root or if "ip netns" does not exist
test "`id -u`" = "0" || exit 77
ip netns list || exit 77
# Initialize two nodes
$tinc $c1 <<EOF
init foo
set Mode switch
set Interface ping.test1
set Port 32573
set Address localhost
EOF
cat >$d1/tinc-up <<EOF
#!/bin/sh
ip netns add ping.test1
ip link set dev \$INTERFACE netns ping.test1
ip netns exec ping.test1 ip addr add 192.168.1.1/24 dev \$INTERFACE
ip netns exec ping.test1 ip link set \$INTERFACE up
EOF
$tinc $c2 <<EOF
init bar
set Mode switch
set Interface ping.test2
set Port 32574
EOF
cat >$d2/tinc-up <<EOF
#!/bin/sh
ip netns add ping.test2
ip link set dev \$INTERFACE netns ping.test2
ip netns exec ping.test2 ip addr add 192.168.1.2/24 dev \$INTERFACE
ip netns exec ping.test2 ip link set \$INTERFACE up
EOF
# Exchange configuration files
$tinc $c1 export | $tinc $c2 exchange | $tinc $c1 import
# Start tinc
$tinc $c1 start $r1
$tinc $c2 start $r2
sleep 1
# The nodes should not be able to ping each other if there is no connection
ip netns exec ping.test1 ping -W1 -c3 192.168.1.2 && exit 1
# After connecting they should be
$tinc $c2 add ConnectTo foo
sleep 1
ip netns exec ping.test1 ping -W1 -c3 192.168.1.2
# Clean up
$tinc $c2 stop
$tinc $c1 stop
ip netns del ping.test2
ip netns del ping.test1