--- /dev/null
+#!/bin/bash
+
+# Three nodes are initialized:
+# latest : created from the latest commit that triggered this CI job
+# tinc11 : from the latest tag in tinc 1.1 branch
+# tinc10 : from the latest commit in tinc 1.0 branch
+#
+# The latter two are configured by using import/export/exchange.
+# Since tinc 1.0 doesn't support that, host configs are copied to its hosts directory.
+# Then nodes are connected and some light testing is performed to make sure they work together.
+
+set -euo pipefail
+
+nodes='latest tinc11 tinc10'
+total_nodes=3
+
+declare -A refs=(
+ [tinc10]='origin/master'
+ [tinc11]="$(git describe --abbrev=0 --match='release-*')"
+ [latest]='HEAD'
+)
+
+declare -A addr=(
+ [tinc10]='192.168.1.1'
+ [tinc11]='192.168.1.2'
+ [latest]='192.168.1.3'
+)
+
+src=/usr/local/src
+etc=/usr/local/etc
+
+mkdir -p $src $etc
+
+archive() {
+ tar -caf /tmp/tests.tar.gz /usr/local/etc || true
+}
+
+header() {
+ echo >&2 '################################################################################'
+ echo >&2 "# $*"
+ echo >&2 '################################################################################'
+}
+
+build_meson() {
+ meson setup "$1" -D prefix="/opt/$1"
+ meson install -C "$1"
+}
+
+build_autotools() {
+ autoreconf -fsi
+ ./configure --prefix="/opt/$1"
+ make -j"$(nproc)"
+ make install
+}
+
+build() {
+ local ref="$1"
+ header "Building tinc (ref $ref)"
+
+ git clone "$PWD" "$src/$ref" -b "compat-$ref"
+ pushd "$src/$ref"
+
+ if [[ -f meson.build ]]; then
+ build_meson "$ref"
+ else
+ build_autotools "$ref"
+ fi
+
+ popd
+ mkdir -p "/opt/$ref/var/run"
+}
+
+wait_network() {
+ local from="$1"
+ local to="$2"
+ local total=0
+
+ while ! ip netns exec "$from" ping -W1 -c1 "${addr[$to]}" >/dev/null; do
+ total=$((total + 1))
+
+ if [[ total -gt 60 ]]; then
+ echo >&2 "Network connection between $from and $to is not working"
+ exit 1
+ fi
+
+ echo >&2 "Network isn't ready yet..."
+ sleep 1
+ done
+}
+
+test_network() {
+ local from="$1"
+ local to="$2"
+
+ wait_network "$from" "$to"
+
+ header "Sending data between $from and $to"
+
+ ip netns exec "$from" \
+ iperf3 --time 1 --client "${addr[$to]}"
+}
+
+test_sign_verify() {
+ local signer="$1"
+ local verifier="$2"
+ local output="$etc/$signer/signed"
+
+ header "Test signature verification between $signer and $verifier"
+
+ "$signer" sign >"$output" <<<"text message for node $signer to sign"
+
+ for peer in "$signer" '*'; do
+ "$verifier" verify "$peer" "$output"
+ "$verifier" verify "$peer" <"$output"
+ done
+}
+
+test_node_status() {
+ local node="$1"
+
+ header "Checking node status for $node"
+
+ reachable="$("$node" dump reachable nodes | wc -l)"
+ echo >&2 "Node $node can reach $reachable nodes"
+
+ [[ $reachable == "$total_nodes" ]]
+
+ for peer in $nodes; do
+ echo >&2 -n "$node info $peer: "
+ "$node" info "$peer" | tee /dev/stderr | grep -E -q '(can reach itself|directly)'
+ done
+}
+
+latest() {
+ /opt/latest/sbin/tinc -c $etc/latest "$@"
+}
+
+tinc11() {
+ /opt/tinc11/sbin/tinc -c $etc/tinc11 "$@"
+}
+
+header 'Creating branches'
+
+for node in $nodes; do
+ echo >&2 " $node: $(git rev-parse "compat-$node")"
+ git branch "compat-$node" "${refs[$node]}"
+done
+
+build tinc10
+build tinc11
+build latest
+
+header 'Initializing node from the latest commit'
+
+latest <<EOF
+ init latest
+ set Address localhost
+ set Port 30000
+ set Interface latest
+ set Subnet ${addr[latest]}
+ set Compression 0
+ set LogLevel 5
+EOF
+
+header 'Initializing node from the latest tag'
+
+tinc11 <<EOF
+ init tinc11
+ set Address localhost
+ set Port 30001
+ set Interface tinc11
+ set Subnet ${addr[tinc11]}
+ set Compression 3
+ set LogLevel 5
+EOF
+
+header 'Initializing node for tinc 1.0'
+
+mkdir -p $etc/tinc10/hosts
+
+cat >$etc/tinc10/tinc.conf <<EOF
+Name = tinc10
+Interface = tinc10
+Compression = 10
+LogLevel = 5
+EOF
+
+cat >$etc/tinc10/hosts/tinc10 <<EOF
+Address = localhost
+Port = 30002
+Subnet = ${addr[tinc10]}
+EOF
+
+/opt/tinc10/sbin/tincd -c $etc/tinc10 --generate-keys
+
+trap archive EXIT INT TERM
+
+header 'Creating network namespaces'
+
+for ns in $nodes; do
+ ip netns add "$ns"
+done
+
+header 'Creating network configuration scripts'
+
+for node in $nodes; do
+ tinc_up="$etc/$node/tinc-up"
+
+ cat >"$tinc_up" <<EOF
+#!/bin/bash
+set -eu
+ip link set dev $node netns $node
+ip netns exec $node ip addr add ${addr[$node]}/24 dev $node
+ip netns exec $node ip link set $node up
+ip netns exec $node ip link set lo up
+ip netns exec $node iperf3 --server --daemon
+EOF
+
+ chmod 755 "$tinc_up"
+done
+
+header 'Exchanging host files'
+
+# Not all configs are copied to make sure 'peer exchange' is working
+# tinc10 <--> latest <--> tinc11
+latest export | tinc11 exchange | latest import
+cp $etc/tinc10/hosts/tinc10 $etc/latest/hosts/
+cp $etc/latest/hosts/latest $etc/tinc10/hosts/
+
+header "Starting nodes"
+
+for node in $nodes; do
+ tincd="/opt/$node/sbin/tincd"
+ echo >&2 "Starting node $node ($tincd)"
+
+ "$tincd" --version
+
+ "$tincd" \
+ --config "$etc/$node" \
+ --pidfile "$etc/$node/pid" \
+ --logfile "$etc/$node/log" \
+ --debug 5
+done
+
+header 'Running connectivity tests'
+
+for client in $nodes; do
+ for server in $nodes; do
+ if [[ $client != "$server" ]]; then
+ test_network "$client" "$server"
+ fi
+ done
+done
+
+test_node_status latest
+test_node_status tinc11
+
+test_sign_verify latest tinc11
+test_sign_verify tinc11 latest
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