66 lines
1.6 KiB
Plaintext
66 lines
1.6 KiB
Plaintext
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#!/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\tpool <id> <port>\n\n\e[1mARGUMENTS\e[0m\n\t<id>\tThe identifier of the pool (client must match it)\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=49152;
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MAX_PORT=65535;
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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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POOL_ID="$1";
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POOL_PT="$2";
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# (2) Launch pool listener
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#--------------------------------------------------------#
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# (1) Start the script in background
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listfail=0;
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# infinite listener
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while true; do
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# Listen on port @2
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echo "(.) listen $POOL_PT";
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MSG=`nc -lp $POOL_PT`;
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# Do nothing if empty msg
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test -z "$MSG" && continue;
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# Extract ID - PORT
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CLI_ID="`echo -ne \"$MSG\" | sed 's/^\(.\+\):\(.\+\)$/\1/'`";
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CLI_PT="`echo -ne \"$MSG\" | sed 's/^\(.\+\):\(.\+\)$/\2/'`";
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# if ID does not match
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test "$CLI_ID" != "$POOL_ID" && echo " /!\\ wrong id" && continue;
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# create new listening socket
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echo " [x] creating socket";
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# Find an available port
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PORT="$MIN_PORT";
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while true; do
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test "$PORT" = "$POOL_PT" && PORT="`expr $PORT + 1`" && continue;
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echo -n " ?? port $PORT -> ";
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ss -tl4 "( sport = :$PORT )" | grep "$PORT" >/dev/null 2>&1 || (echo "free"; exit 1) || break;
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echo "used";
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PORT="`expr $PORT + 1`";
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done;
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echo " > listen $PORT";
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done;
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