From 579825f67f508566d462ad19e2965abb8c98a054 Mon Sep 17 00:00:00 2001
From: xdrm-brackets <doowap31@gmail.com>
Date: Sun, 4 Feb 2018 14:36:05 +0100
Subject: [PATCH] add: 'trigger-wait' and 'trigger-wait' with key management

---
 trigger-send | 31 ++++++++++++++++++
 trigger-wait | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 122 insertions(+)
 create mode 100755 trigger-send
 create mode 100755 trigger-wait

diff --git a/trigger-send b/trigger-send
new file mode 100755
index 0000000..dc7708d
--- /dev/null
+++ b/trigger-send
@@ -0,0 +1,31 @@
+#!/bin/bash
+#!/bin/bash
+
+
+# (1) Init.
+#--------------------------------------------------------#
+# (1) Get current absolute dir
+ROOT=$(dirname `realpath $0`);
+
+# (2) Check argc
+test $# -lt 2 && echo -e "error: too fewarguments\n\n\e[1mUSAGE\e[0m\n\ttrigger-send <key> <host> <port>\n\n\e[1mARGUMENTS\e[0m\n\t<key>\tThe key of the trigger\n\t<host>\tThe host to send the trigger to\n\t<port>\tThe port to send the trigger to\n" && exit 1;
+
+# (3) Check @PORT range #
+MIN_PORT=1024;
+MAX_PORT=49151;
+test "$3" -gt "$MAX_PORT" -o "$3" -lt "$MIN_PORT" && echo "error: <port> must be between $MIN_PORT and $MAX_PORT" && exit 1;
+
+# (4) Set argument explicit names #
+TRIGGER_KEY="$1";
+TRIGGER_HOST="$2";
+TRIGGER_PORT="$3";
+
+
+
+
+# (2) Send trigger signal
+#--------------------------------------------------------#
+echo "+ connecting to $TRIGGER_HOST:$TRIGGER_PORT";
+bash -c "exec 4>/dev/tcp/$TRIGGER_HOST/$TRIGGER_PORT; echo -n \"$TRIGGER_KEY\" >&4; ";
+echo "  + message '$TRIGGER_KEY' sent";
+echo "+ close connection";
\ No newline at end of file
diff --git a/trigger-wait b/trigger-wait
new file mode 100755
index 0000000..8d87fd0
--- /dev/null
+++ b/trigger-wait
@@ -0,0 +1,91 @@
+#!/bin/bash
+#!/bin/bash
+
+
+# (1) Init.
+#--------------------------------------------------------#
+# (1) Get current absolute dir
+ROOT=$(dirname `realpath $0`);
+
+# (2) Check argc
+test $# -lt 2 && echo -e "error: too fewarguments\n\n\e[1mUSAGE\e[0m\n\ttrigger-wait <key> <port>\n\n\e[1mARGUMENTS\e[0m\n\t<key>\tThe key of the trigger (client must match it)\n\t<port>\tTo port to listen to\n" && exit 1;
+
+# (3) Check @PORT range #
+MIN_PORT=1024;
+MAX_PORT=49151;
+test "$2" -gt "$MAX_PORT" -o "$2" -lt "$MIN_PORT" && echo "error: <port> must be between $MIN_PORT and $MAX_PORT" && exit 1;
+
+# (4) Set argument explicit names #
+TRIGGER_KEY="$1";
+TRIGGER_PORT="$2";
+
+# (5) Create a temporary file #
+TMPFILE="/dev/shm/trigger_wait_${TRIGGER_KEY}_pid";
+
+
+# (6) Define on-exit routine #
+LOOP_PID="";
+on_exit(){
+
+	echo "- killing loop";
+	kill -INT $LOOP_PID 2>/dev/null;
+
+	echo "- killing main listener ($TRIGGER_PID)";
+	kill -INT $TRIGGER_PID 2>/dev/null;
+
+	# delete tmp file
+	echo "- deleting tmp file";
+	rm $TMPFILE 2>/dev/null;
+
+	exit 1;
+
+}
+
+
+
+
+# (2) Launch pool listener
+#--------------------------------------------------------#
+# (1) Bind-input #
+echo -e "\e[32m+\e[0m listen $TRIGGER_PORT";
+$ROOT/bind-input trigger $TRIGGER_PORT > $TMPFILE;
+TRIGGER_PID="`cat $TMPFILE`";
+
+
+
+# (3) Launch pool manager
+#--------------------------------------------------------#
+# infinite listener
+(
+	trap "on_exit;" HUP INT KILL TERM;
+
+	while true; do
+
+		# Listen on port @TRIGGER_PORT
+		MSG=`$ROOT/read trigger`;
+
+		# Do nothing if empty msg
+		test -z "$MSG" && sleep .5 && continue;
+
+		echo -e "  + received '\e[33m$MSG\e[0m'";
+
+		# If wrong key
+		test "$MSG" != "$TRIGGER_KEY" && echo "  + wrong key" && sleep .5 && continue;
+
+		# If valid key
+		echo "  + trigger received" && echo -e "\e[31m+\e[0m stop listening on $TRIGGER_PORT" && break;
+
+	done;
+
+)&
+LOOP_PID=$!;
+
+# (4) Set exit management
+#--------------------------------------------------------#
+# (1) Set trap for "exit" signals #
+trap "kill -INT $LOOP_PID 2>/dev/null;" HUP INT KILL TERM;
+
+# (2) Wait for main loop to end
+wait $LOOP_PID;
+
+on_exit;
\ No newline at end of file