83 lines
1.8 KiB
Bash
Executable File
83 lines
1.8 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-output <id> <ip> <port>\n\n\e[1mARGUMENTS\e[0m\n\t<id>\tThe identifier of the output (buffer name)\n\t<ip>\tThe ip or host of the target\n\t<port>\tThe port to connect 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 "$3" -gt "$MAX_PORT" -o "$3" -lt "$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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OUT_ID="$1";
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OUT_IP="$2";
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OUT_PT="$3";
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# (2) Prepare buffer
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#--------------------------------------------------------#
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# (1) Create buffer path
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BUFFER="/tmp/outbuf_$OUT_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 OUTPUT server
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#--------------------------------------------------------#
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(
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echo " > binding $BUFFER to $OUT_IP:$OUT_PT";
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trap "kill -9 %1 2>/dev/null" INT KILL;
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outfail=0;
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# (1) kill script after 10 failures
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while [ $outfail -lt 10 ]; do
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# (2) bind socket to buffer
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# echo " + $BUFFER -> $OUT_IP:$OUT_PT";
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# (3) Check if port open
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nc -z $OUT_IP $OUT_PT >/dev/null 2>&1;
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PORT_CLOSED=$?;
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# (4) Manage taken port #
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if [ "$PORT_CLOSED" -eq "1" ]; then
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outfail="`expr $outfail + 1`";
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test "$outfail" -gt "1" && sleep .5;
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continue;
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fi;
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# (5) Bind output
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outfail="0";
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( tail -f $BUFFER | nc $OUT_IP $OUT_PT 2> /dev/null )&
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wait $!;
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done;
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)&
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LOOP_PID=$!;
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# (2) Remove buffer + kill loop #
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on_exit(){
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echo " < closing binding from $BUFFER to $OUT_IP:$OUT_PT";
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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; |