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51 lines
1.2 KiB
51 lines
1.2 KiB
3 years ago
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#!/bin/bash
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# Клиент (компьютер ученика) стучится на этот скрипт через веб-сервер
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# и тем самым заставляет доску (сервер) соединиться с его компьютером
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set -e
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set -f
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set -u
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3 years ago
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# mktemp(1) does not respect umask
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# https://bugzilla.altlinux.org/show_bug.cgi?id=42550
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# $1: directory in which file will be created
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# Returns path to file without creating it
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# (theoretically vulnerabile to races)
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_mktemp(){
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local rand
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while true
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do
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3 years ago
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rand="$(set -eo pipefail && head -c 55 /dev/urandom | base64 | grep -o '[[:alnum:]]' | head -c 20 | tr -d '\n')"
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3 years ago
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if ! test -f "$1"/"$rand" ; then
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echo "$1"/"$rand"
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break
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fi
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done
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}
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# $1: directory
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3 years ago
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_main_trigger_connect(){
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3 years ago
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echo "$REMOTE_ADDR" > "$(_mktemp "$dir")"
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3 years ago
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}
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3 years ago
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3 years ago
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# $1: HTTP_STATUS_CODE
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# $2: HTTP_STATUS_DESCRIPTION
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# $3: text of responce
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_response_text(){
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if [ -z "$*" ]; then
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echo_err "Empty args of html_reposnse"
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exit 1
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fi
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echo "Status: $1 $2"
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#echo "Access-Control-Allow-Origin: *"
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echo "Content-Type: text/plain; charset=utf-8"
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echo -e "\n$3"
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}
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if [ "${SOURCED:-0}" != 1 ]; then
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readonly dir='/var/spool/doskast'
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3 years ago
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_main_trigger_connect "$dir"
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3 years ago
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_response_text 200 OK OK
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fi
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