88 lines
2.8 KiB
Bash
Executable File
88 lines
2.8 KiB
Bash
Executable File
#!/bin/sh
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# we will need the suicide bashrc to continuously write DEAD to the nc socket
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# in case two messages are sent at the same time.
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# this will not work if your slbr admin is not in the "docker" group
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PORT="$1"
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LOG="log.txt"
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[ -z "$1" ] && echo "port?" && exit
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docker_subnet_mask="$(
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docker network inspect bridge \
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| jq '.[0].IPAM.Config[0].Subnet' \
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| tr -d '"' \
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| cut -f2 -d '/'
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)"
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handle_packet() {
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packet="$1"
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message="$(echo $packet | cut -f3 -d '|')"
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address="$(
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echo "$packet" \
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| cut -f2 -d '|' \
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| grep -Eo \
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'(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}'
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)"
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address="$address/$docker_subnet_mask"
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if [ "$message" = "DEAD" ]
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then
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echo "Killing user with ip $address" >> $LOG
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container_name="$(
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docker network inspect bridge \
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| jq \
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'.[0].Containers
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| map(select(.IPv4Address == "'"$address"'"))
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| .[0].Name' \
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| tr -d '"'
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)"
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docker rm -f "$container_name"
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echo "killed container $container_name" >> $LOG
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elif [ "$(echo $message | cut -f1 -d ' ')" = "SOLUTION" ]
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then
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submitted_solution="$(echo $message | cut -f3- -d ' ')"
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challenge_no="$(echo $message | cut -f2 -d ' ')"
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correct_solution="$(sed $challenge_no'q;d' solutions.txt)"
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sed_escaped_address="$(echo $address | sed 's/\./\\./g')"
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echo "$address submitted solution for challenge $challenge_no: $submitted_solution" >> $LOG
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if [ "$submitted_solution" = "$correct_solution" ]
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then
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num_correct=""
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echo "Solution was correct!" >> $LOG
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grep -qE "^$address" scoreboard.txt \
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|| echo "$address" >> scoreboard.txt
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grep -qE "^$address .*$challenge_no," scoreboard.txt \
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|| sed -i "s|$sed_escaped_address|$address $challenge_no,|" scoreboard.txt
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num_correct="$(
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grep -m1 -E "^$address" scoreboard.txt \
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| grep -oE '[0-9],' \
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| wc -l
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)"
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total_solutions="$(cat solutions.txt | wc -l)"
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if [ $num_correct = $total_solutions ]
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then
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echo "$address HAS WON THE GAME!!!" >> $LOG
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sleep 5
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echo "Killing all continers..." >> $LOG
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docker ps -aq --filter label="description=SLBR User Container" | xargs docker rm -f
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exit
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fi
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echo "$num_correct correct answers so far" >> $LOG
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fi
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fi
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}
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echo "game server listening on $PORT"
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while true
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do
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packet=$(nc -w 1 -W 1 -nvlp $PORT 2>&1)
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handle_packet "$(echo "$packet" | head -n 3 | tr '\n' '|')" &
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done
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