84 lines
1.7 KiB
Bash
Executable File
84 lines
1.7 KiB
Bash
Executable File
#!/bin/bash
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# (1) Init.
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#--------------------------------------------------------#
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# (1) Get current absolute dir
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ROOT=$(dirname `realpath $0`);
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# (2) Check argc
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test $# -lt 2 && echo -e "error: too fewarguments\n\n\e[1mUSAGE\e[0m\n\tbind-input <id> <port>\n\n\e[1mARGUMENTS\e[0m\n\t<id>\tThe identifier of the input (buffer name)\n\t<port>\tTo port to listen to\n" && exit 1;
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# (3) Check @PORT range #
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MIN_PORT=1024;
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MAX_PORT=49151;
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test "$2" -gt "$MAX_PORT" -o "$2" -lt "$MIN_PORT" && echo "error: <port> must be between $MIN_PORT and $MAX_PORT" && exit 1;
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# (4) Set argument explicit names #
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IN_ID="$1";
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IN_PT="$2";
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# (2) Prepare buffer
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#--------------------------------------------------------#
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# (1) Create buffer path
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BUFFER="/tmp/inbuf_$IN_ID";
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# (2) Create/Flush buffer
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test -f $BUFFER && rm $BUFFER;
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touch $BUFFER;
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# (3) Launch INPUT server
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#--------------------------------------------------------#
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(
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echo " > binding port $IN_PT to $BUFFER";
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trap "kill -9 $NC_PID 2>/dev/null" INT KILL;
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infail=0;
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# (1) kill script after 10 failures
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while [ $infail -lt 10 ]; do
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# (2) bind socket to buffer
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# echo " + $IN_PT -> $BUFFER";
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# (3) Check if port already in use
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ss -tl4 "( sport = :$IN_PT )" | grep "$IN_PT" >/dev/null;
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PORT_TAKEN=$?;
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# (4) Manage taken port #
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if [ "$PORT_TAKEN" -ne "1" ]; then
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infail="`expr $infail + 1`";
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test "$infail" -gt "1" && sleep .5;
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continue;
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fi;
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# (5) Bind input
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infail="0";
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( nc -lp $IN_PT >> $BUFFER 2>/dev/null )&
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NC_PID=$!;
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wait $NC_PID;
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done;
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)&
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LOOP_PID=$!;
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# (2) Remove buffer + kill loop #
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on_exit(){
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echo " < closing binding port $IN_PT to $BUFFER";
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rm $BUFFER 2>/dev/null;
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kill -9 $LOOP_PID 2>/dev/null;
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}
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trap "on_exit;" INT KILL;
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wait $LOOP_PID;
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on_exit; |