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[distro-setup] / exim-nn-iptables

diff --git a/exim-nn-iptables b/exim-nn-iptables
index 119eaf0396daf3de56b2a6fdaed0b17505b1a167..da631b55fae6872f528179829a0d3a47ff8d7d2e 100755 (executable)
--- a/exim-nn-iptables
+++ b/exim-nn-iptables
@@ -1,4 +1,25 @@
 #!/bin/bash
+# I, Ian Kelling, follow the GNU license recommendations at
+# https://www.gnu.org/licenses/license-recommendations.en.html. They
+# recommend that small programs, < 300 lines, be licensed under the
+# Apache License 2.0. This file contains or is part of one or more small
+# programs. If a small program grows beyond 300 lines, I plan to switch
+# its license to GPL.
+
+# Copyright 2024 Ian Kelling
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 
 if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
 shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
@@ -17,11 +38,11 @@ trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" exit status: $?, PIPESTATUS: ${P
 # on the systemd automatic restart. Ugh. So, better to use Wants instead
 # and this.
 
-if !/usr/sbin/iptables -C OUTPUT -p tcp -m tcp --dport 25 -o veth1-mail -j REJECT &>/dev/null; then
+if ! /usr/sbin/iptables -C OUTPUT -p tcp -m tcp --dport 25 -o veth1-mail -j REJECT &>/dev/null; then
  /usr/sbin/iptables -I OUTPUT -p tcp -m tcp --dport 25 -o veth1-mail -j REJECT
 fi
 
 
-if !/usr/sbin/ip6tables -C OUTPUT -p tcp -m tcp --dport 25 -o veth1-mail -j REJECT &>/dev/null; then
+if ! /usr/sbin/ip6tables -C OUTPUT -p tcp -m tcp --dport 25 -o veth1-mail -j REJECT &>/dev/null; then
  /usr/sbin/ip6tables -I OUTPUT -p tcp -m tcp --dport 25 -o veth1-mail -j REJECT
 fi