103 lines
2.4 KiB
Plaintext
103 lines
2.4 KiB
Plaintext
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#!/bin/bash
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# (1) Primary setup
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#--------------------------------------------------------#
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# (1) Get current ABS directory
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ROOT=$(dirname `realpath $0`);
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# (2) Check required arguments
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test $# -lt 4 && echo -e "ERR: Missing arguments\n\nARGUMENTS:\n\tname\t\tThe name of the machine\n\ttarget_host\tThe hostname (or ip) of the target\n\tout_port\tThe port you want to use to send\n\tin_port\t\tThe port the peer uses to listen\n\ttrigger_port\tOptional param. Used to trigger the peer connection\n" && exit 1;
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# (3) Manage optional param #
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TRIGGER="";
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test $# -ge 5 && TRIGGER="$5";
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# (2) Secondary setup
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#--------------------------------------------------------#
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# (1) Reset configuration file
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test -f $ROOT/config && rm $ROOT/config;
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# (2) Create buffer paths
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BUF_IN="/tmp/buf_in_$4";
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BUF_OUT="/tmp/buf_out_$2_$3";
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# (3) Flush buffers
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echo -ne "" > $BUF_IN;
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echo -ne "" > $BUF_OUT;
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# (3) Launch INPUT server
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#--------------------------------------------------------#
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# (1) Start the script in background
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(
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infail=0;
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# kill script after 10 failures
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while [ $infail -lt 10 ]; do
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# main command
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nc -lp $4 >> $BUF_IN && infail=0 || infail=`expr $infail + 1`;
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# try to kill proccess that uses port if failed and such proccess exists
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if [ $infail -gt 0 ]; then
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LISTEN_PID=`lsof -n -i4TCP:$4 | grep LISTEN | awk '{print $2}'`;
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test -z "$LISTEN_PID" && kill -9 $LISTEN_PID;
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fi;
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done;
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)&
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# (2) Store the background proccess PID #
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IN_PID=$!;
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################################
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# IF SET, SEND TRIGGER TO PEER #
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################################
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test ! -z "$TRIGGER" && bash -c "exec 3<>/dev/tcp/$2/$TRIGGER";
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##################################
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# WAIT 2s FOR THE PEER TO LISTEN #
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##################################
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sleep 2;
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# (4) Launch OUTPUT server
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#--------------------------------------------------------#
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# (1) Launch output server
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(
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outfail=0;
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# stop after 20 failed attempts
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while [ $outfail -lt 20 ]; do
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# main command
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tail -f $BUF_OUT | nc $2 $3 && outfail=0 || outfail=`expr $outfail + 1`;
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sleep 1; # can sleep because the buffer is never flushed
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done&
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)&
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# (2) Store the background proccess PID #
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OUT_PID=$!;
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# (5) Store the config file for 'write' + 'send' to work properly
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#--------------------------------------------------------#
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# (1) Store config file in 'config_$NAME'
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echo -e "#!/bin/bash\nBUF_IN=\"$BUF_IN\"; BUF_OUT=\"$BUF_OUT\";\nIN_PID=$IN_PID; OUT_PID=$OUT_PID;\n" > $ROOT/config_$1;
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