From c0713400778eb412d113ea217982a586d79f35fe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=81LI=20G=C3=A1bor=20J=C3=A1nos?= <pali.gabor@gmail.com>
Date: Tue, 29 Nov 2022 04:53:11 +0100
Subject: Implement a forwarding service.

- Add the `forwarding` system service (script + OpenRC support).
- Enable support for UDP ports for `socat`.
- Adjust UDS pass-through to avoid conflicts with forwarding.
- Update documentation.

Requested by:	Universal Devices
---
 aports/forwarding/APKBUILD         | 26 +++++++++++++++
 aports/forwarding/forwarding       | 65 ++++++++++++++++++++++++++++++++++++++
 aports/forwarding/forwarding.initd | 13 ++++++++
 3 files changed, 104 insertions(+)
 create mode 100644 aports/forwarding/APKBUILD
 create mode 100644 aports/forwarding/forwarding
 create mode 100644 aports/forwarding/forwarding.initd

(limited to 'aports/forwarding')

diff --git a/aports/forwarding/APKBUILD b/aports/forwarding/APKBUILD
new file mode 100644
index 0000000..f735cf4
--- /dev/null
+++ b/aports/forwarding/APKBUILD
@@ -0,0 +1,26 @@
+# Maintainer: Gabor Pali <pali.gabor@gmail.com>
+
+pkgname=forwarding
+pkgver=0.1.0
+pkgrel=0
+pkgdesc="Forwarding management service for Wifibox"
+url="https://github.com/pgj/freebsd-wifibox-alpine"
+arch="all"
+license="BSD2"
+depends="socat"
+install=""
+subpackages=
+options="!check"
+arch="noarch"
+source="forwarding.initd
+	forwarding
+"
+
+package() {
+	install -D -m755 "$srcdir"/forwarding.initd "$pkgdir"/etc/init.d/forwarding
+	install -D -m755 "$srcdir"/forwarding "$pkgdir"/sbin/forwarding
+}
+sha512sums="
+4df2661906f5f1c3bc93ef29f2e9265e5391ae1a24a990e7bf70b4687b65cfae5afe4be481214e9fa2646137b37c9fe688074d0e4ebe1c2a5a73a3ec8fbb0098  forwarding.initd
+ffc13f4384e896e59c695826a659e5ab5df06e08a0b418e67cebf0fe43ac22dfb57489031db7e9bef4465cd6f6cdf188606ad2b02c945acfcd1911fd21ee4a1e  forwarding
+"
diff --git a/aports/forwarding/forwarding b/aports/forwarding/forwarding
new file mode 100644
index 0000000..be1fc64
--- /dev/null
+++ b/aports/forwarding/forwarding
@@ -0,0 +1,65 @@
+#!/bin/sh
+# shellcheck disable=SC2034,SC3043,SC3060
+
+log() {
+    local _level="$1"
+    local _message="$2"
+
+    /usr/bin/logger -p "daemon.${_level}" -t "forwarding[$$]" "${_message}"
+}
+
+capture_output() {
+    local _type="$1"
+    local _id="$2"
+
+    while read -r message; do
+	log "${_type}" "[${_id}] ${message}"
+    done
+}
+
+_block=
+
+terminate() {
+    local _sleep
+
+    if [ -n "${_block}" ]; then
+	log info "Received signal for termination, stopping PID ${_block}."
+	/bin/kill -KILL "${_block}"
+	log debug "Killed: $?"
+	_sleep=$(/bin/ps -o ppid,comm,pid \
+		     | /bin/grep -F "1 sleep" \
+		     | /usr/bin/head -1 \
+		     | /bin/sed "s@[ ]*1[ ]*sleep[ ]*@@")
+	log info "Stopping the orphaned sleep as PID ${_sleep}."
+	/bin/kill -KILL "${_sleep}"
+	log debug "Killed: $?"
+    else
+	log warn "Nothing is blocked, nothing to do."
+    fi
+}
+
+trap terminate TERM
+
+while read -r _line; do
+    _parameters=$(echo "${_line}" | /bin/sed '/^[[:blank:]]*#/d;s/#.*//')
+
+    [ -z "${_parameters}" ] && continue
+
+    log info "Launching socat with parameters: [${_parameters}]"
+    /usr/bin/socat ${_parameters} 2>&1 \
+	| capture_output debug socat &
+done < /media/etc/forwarding.conf
+
+(while /bin/true; do /bin/sleep 365d; done) &
+_block=$!
+
+log info "Waiting for PID ${_block} to stop."
+wait "${_block}"
+
+_socats=$(/usr/bin/pgrep -P $$ socat)
+log info "Stopping, own socat processes: [${_socats}]"
+
+# shellcheck disable=SC2086
+[ -n "${_socats}" ] && /bin/kill -TERM ${_socats}
+
+log info "Finished."
diff --git a/aports/forwarding/forwarding.initd b/aports/forwarding/forwarding.initd
new file mode 100644
index 0000000..fd63aa0
--- /dev/null
+++ b/aports/forwarding/forwarding.initd
@@ -0,0 +1,13 @@
+#!/sbin/openrc-run
+
+supervisor=supervise-daemon
+name="Forwarding service"
+description="Forwarding support"
+
+command=/sbin/forwarding
+command_background=true
+
+depend() {
+	need net
+	after firewall
+}
-- 
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