Make token generator script

challenge/Dockerfile

@@ -57,5 +57,7 @@ FROM scratch
 
 COPY --from=mirror /out/ /
 COPY init /init
+COPY bin/ /bin/
 COPY etc/ /etc/
 COPY lib/ /lib/
+COPY sbin/ /sbin/

challenge/bin/adlin

@@ -0,0 +1,93 @@
+#!/bin/sh
+
+# FUNCTIONS ###########################################################
+
+# script usage
+usage() {
+    >&2 cat <<EOF
+ADLIN token generator
+EOF
+}
+
+# token generator
+token_generator() {
+    {
+	echo -n ${PKEY}
+	for d
+	do
+	    echo -n :${d}
+	done
+    } | b2sum | cut -d ' ' -f 1
+}
+
+# JSON token format helper
+token_format() {
+    local TID=$1
+    local TOKEN=$2
+    shift 2
+
+    [ $# -gt 0 ] && {
+	local DATA=',
+    "data": [';
+	for d; do
+	    [ -z "$Z" ] && Z=1 || DATA="$DATA, "
+	    DATA="$DATA\"$d\""
+	done
+	DATA="$DATA]"
+    }
+
+    >&2 cat <<EOF
+{
+    "login": "${ULGN}",
+    "challenge": ${TID},
+    "token": "${TOKEN}"${DATA}
+}
+EOF
+}
+
+# /proc/cmdline parser (from Gentoo Wiki)
+cmdline() {
+    local value
+    value=" $(cat /proc/cmdline) "
+    value="${value##* $1=}"
+    value="${value%% *}"
+    [ "$value" != "" ] && echo "$value"
+}
+
+
+# GLOBAL VARIABLES ####################################################
+
+ULGN=$(cmdline adlin.login)
+PKEY=$(cmdline adlin.key)
+
+
+# MAIN ################################################################
+
+[ $# -lt 1 ] && { usage; exit 1; }
+
+case "$1" in
+    token1|token2)
+	HDATA=42
+	;;
+    token3|token6)
+	DATA=$(date +%s%N)
+    ;;
+    token4)
+	echo "$1 is not here! Perhaps it has been accidentally deleted?" >&2
+	exit 2
+    ;;
+    token5)
+	HDATA=$(dig +short +time=1 +tries=0 adlin.nemunai.re $2 | sed 's/"//g') || {
+	    echo "Try again! Your resolver settings seems not good :(" >&2
+	    exit 3
+	}
+	echo $HDATA | grep "not here" 2> /dev/null && exit 3
+    ;;
+    *)
+	echo "Invalid argument: $1" >&2
+	usage
+	exit 1
+	;;
+esac
+
+token_format "${1#token}" "$(token_generator ${1#token} ${HDATA} ${DATA})" ${DATA}