You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.2 KiB
50 lines
1.2 KiB
#!/bin/bash
|
|
# Клиент (компьютер ученика) стучится на этот скрипт через веб-сервер
|
|
# и тем самым заставляет доску (сервер) соединиться с его компьютером
|
|
|
|
set -e
|
|
set -f
|
|
set -u
|
|
|
|
# mktemp(1) does not respect umask
|
|
# https://bugzilla.altlinux.org/show_bug.cgi?id=42550
|
|
# $1: directory in which file will be created
|
|
# Returns path to file without creating it
|
|
# (theoretically vulnerabile to races)
|
|
_mktemp(){
|
|
local rand
|
|
while true
|
|
do
|
|
rand="$(set -eo pipefail && head -c 55 /dev/urandom | base64 | grep -o '[[:alnum:]]' | head -c 20 | tr -d '\n')"
|
|
if ! test -f "$1"/"$rand" ; then
|
|
echo "$1"/"$rand"
|
|
break
|
|
fi
|
|
done
|
|
}
|
|
|
|
# $1: directory
|
|
_main_trigger_connect(){
|
|
echo "$REMOTE_ADDR" > "$(_mktemp "$dir")"
|
|
}
|
|
|
|
|
|
# $1: HTTP_STATUS_CODE
|
|
# $2: HTTP_STATUS_DESCRIPTION
|
|
# $3: text of responce
|
|
_response_text(){
|
|
if [ -z "$*" ]; then
|
|
echo_err "Empty args of html_reposnse"
|
|
exit 1
|
|
fi
|
|
echo "Status: $1 $2"
|
|
#echo "Access-Control-Allow-Origin: *"
|
|
echo "Content-Type: text/plain; charset=utf-8"
|
|
echo -e "\n$3"
|
|
}
|
|
|
|
if [ "${SOURCED:-0}" != 1 ]; then
|
|
readonly dir='/var/spool/doskast'
|
|
_main_trigger_connect "$dir"
|
|
_response_text 200 OK OK
|
|
fi
|
|
|