dnsproxy-setup.sh

#!/bin/sh
REPO="https://github.com/AdguardTeam/dnsproxy"
DIR="/opt/adguard"
TMP_DIR=$(mktemp -d)
test() {
  local TEST="aria2c xh curl wget"
  for cmd in $TEST; do
    command -v $cmd 2>&0
  done
}
CMDS=$(test)
url() {
  case "$CMDS" in
    *xh*) xh HEAD $1 --no-check-status -h;;
    *curl*) curl -ISs $1;;
    *wget*) wget --max-redirect=0 $1 2>&1;;
  esac
}
LATEST=$(url "${REPO}/releases/latest" | grep -i ^location: | sed 's/.*\/\([v0-9.]\+\).*/\1/')
download() {
  local FILE="dnsproxy-${1}-${LATEST}.tar.gz"
  local URL="${REPO}/releases/download/${LATEST}/${FILE}"
  case "$CMDS" in
    *aria2c*)
    aria2c $URL -d "$TMP_DIR" -o "$FILE" -j5 -x10 -s8 -k1M --optimize-concurrent-downloads --header="Accept-Encoding: zstd, br, gzip, deflate";;
    *xh*)
    xh -Fd $URL -o "$TMP_DIR/$FILE" Accept-Encoding:'zstd, br, gzip, deflate';;
    *curl*)
    curl -L $URL -o "$TMP_DIR/$FILE" --compressed -H "Accept-Encoding: zstd, br, gzip, deflate";;
    *wget*)
    wget $URL -O "$TMP_DIR/$FILE" --header="Accept-Encoding: zstd, br, gzip, deflate";;
  esac
  local TPATH=$(tar -ztf $TMP_DIR/$FILE | grep dnsproxy$)
  local RDIR=$(echo $TPATH | sed 's/^\.\///;s/dnsproxy$//')
  tar -C $TMP_DIR -zxf $TMP_DIR/$FILE $TPATH
  mv -f $TMP_DIR/${RDIR}dnsproxy $TMP_DIR/dnsproxy && chown root:root $TMP_DIR/dnsproxy
}
sysctlfn() {
  local SERVICE="adguard-dnsproxy.service"
  if [ $(systemctl list-unit-files "$SERVICE" | wc -l) -gt 3 ]; then
  systemctl $1 $SERVICE
  fi
}
[ -d "$DIR" ] || mkdir $DIR
if [ -f "$DIR/dnsproxy" ]; then
  VERSION=$($DIR/dnsproxy --version | awk '{print $NF}')
  OUTPUT=$(printf "$VERSION\n$LATEST" | sed '/^$/d' | sort -Vr | head -1)
  if [ "$VERSION" != "$OUTPUT" ]; then
    download "${1}"
    sysctlfn stop
    [ -f "$TMP_DIR/dnsproxy" ] && mv -f $TMP_DIR/dnsproxy $DIR/dnsproxy && rm -rf $TMP_DIR
    sysctlfn start
  fi
else
  download "${1}"
  [ -f "$TMP_DIR/dnsproxy" ] && mv -f $TMP_DIR/dnsproxy $DIR/dnsproxy && rm -rf $TMP_DIR
fi