#!/bin/sh

# shellcheck disable=SC1090
. "$TESTLIB_PATH"

require_root "$0" "$@"
test -e /dev/net/tun || exit "$EXIT_SKIP_TEST"
ip netns list || exit "$EXIT_SKIP_TEST"
command -v socat || exit "$EXIT_SKIP_TEST"

ip_foo=192.168.1.1
ip_bar=192.168.1.2
port_foo=30100
recv_port_foo=30101
mask=24

echo '[STEP] Determining supported compression levels'

features=$(tincd foo --version)
bogus_levels="-1 13"
levels=0

add_levels() {
  algo=$1
  shift

  if echo "$features" | grep "comp_$algo"; then
    levels="$levels $*"
  else
    bogus_levels="$bogus_levels $*"
  fi
}

add_levels zlib 1 2 3 4 5 6 7 8 9
add_levels lzo 10 11
add_levels lz4 12

echo "Supported compression levels: $levels"
echo "Unsupported compression levels: $bogus_levels"

echo [STEP] Create network namespaces

ip netns add foo
ip netns add bar
tmp_file=$(mktemp)

cleanup_hook() {
  ip netns del foo
  ip netns del bar
  rm -f "$tmp_file"
}

echo [STEP] Initialize two nodes

tinc foo <<EOF
init foo
set Subnet $ip_foo
set Interface foo
set Port $port_foo
set Address localhost
EOF

tinc bar <<EOF
init bar
set Subnet $ip_bar
set Interface bar
set ConnectTo foo
EOF

# shellcheck disable=SC2016
create_script foo tinc-up "
  ip link set dev \$INTERFACE netns foo
  ip netns exec foo ip addr add $ip_foo/$mask dev \$INTERFACE
  ip netns exec foo ip link set \$INTERFACE up
"

# shellcheck disable=SC2016
create_script bar tinc-up "
  ip link set dev \$INTERFACE netns bar
  ip netns exec bar ip addr add $ip_bar/$mask dev \$INTERFACE
  ip netns exec bar ip link set \$INTERFACE up
"

echo [STEP] Exchange configuration files

tinc foo export | tinc bar exchange | tinc foo import

echo [STEP] Test supported compression levels

ref_file=$0

create_script foo hosts/bar-up
create_script bar hosts/foo-up

for level in $levels; do
  echo "[STEP] Testing compression level $level"

  tinc foo set Compression "$level"
  tinc bar set Compression "$level"

  start_tinc foo
  wait_script foo tinc-up

  start_tinc bar
  wait_script bar tinc-up

  wait_script foo hosts/bar-up
  wait_script bar hosts/foo-up

  sh <<EOF
    set -eu
    ip netns exec foo socat -u TCP4-LISTEN:$recv_port_foo,reuseaddr OPEN:"$tmp_file",creat &
    ip netns exec bar socat -u OPEN:"$ref_file" TCP4:$ip_foo:$recv_port_foo,retry=30 &
    wait
EOF

  diff -w "$ref_file" "$tmp_file"

  tinc foo stop
  tinc bar stop
done

echo '[STEP] Invalid compression levels should fail'

for level in $bogus_levels; do
  echo "[STEP] Testing bogus compression level $level"
  tinc foo set Compression "$level"

  output=$(expect_code "$EXIT_FAILURE" start_tinc foo 2>&1)

  if ! echo "$output" | grep -q 'Bogus compression level'; then
    bail 'expected message about the wrong compression level'
  fi
done