scubbo/cloudflaredtunneldns
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Jack Jackson 2022-08-19 16:51:47 -07:00
commit 48993f0e4d
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37
Dockerfile Normal file
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FROM debian:buster
######
## Install cloudflared tool
######
# Instructions from https://pkg.cloudflare.com/
RUN apt update && apt -y upgrade
# These two utilities are required but are (understandably) not listed
# in pkg.cloudflare.com's instructions
RUN apt install -y curl ca-certificates
# This utility is required for installation of yq - but we put it earlier
# to maximize build cache hits
RUN apt install -y wget
RUN mkdir -p --mode=0755 /usr/share/keyrings
RUN curl -fsSL https://pkg.cloudflare.com/cloudflare-main.gpg\
| tee /usr/share/keyrings/cloudflare-main.gpg >/dev/null
# Do not try to line-break in the middle of the quoted string!
RUN echo 'deb [signed-by=/usr/share/keyrings/cloudflare-main.gpg] https://pkg.cloudflare.com/cloudflared buster main' \
| tee /etc/apt/sources.list.d/cloudflared.list
RUN apt update && apt install cloudflared
######
## Install yq (for parsing YAML)
######
# https://github.com/mikefarah/yq - I tried switching to `curl -o -` but that gave no output?
RUN wget https://github.com/mikefarah/yq/releases/download/v4.18.1/yq_linux_arm64.tar.gz -O - 2>/dev/null |\
tar xz && mv yq_linux_arm64 /usr/bin/yq
######
## Install own script
######
COPY dns_update.sh .

27
dns_update.sh Executable file
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#!/bin/sh
# First argument is cloudflared config file
# TODO - make this optional, and check standard locations if absent.
# Not doing it now because that would require me to remember how to
# do named arguments with bash (I think it's `getopt`?), and ain't
# nobody got time for that.
if [ $# -lt 1 ]; then
echo "Requires an argument pointing to the config file";
exit 1;
fi
CONFIG_FILE_LOCATION=$1
if [ ! -f $CONFIG_FILE_LOCATION ]; then
echo "File \"$CONFIG_FILE_LOCATION\" does not exist";
exit 1;
fi
# Second argument is "root domain".
# If set, only try to update DNS for names that are subdomains of this domain.
# If not set, try to update all names
if [ $# -gt 1 ]; then
ROOT_DOMAIN=$2;
yq ".ingress[].hostname | select(. != null) | select (. == \"*$ROOT_DOMAIN\")" $CONFIG_FILE_LOCATION | xargs -I {} echo "Would process {}";
else
yq '.ingress[].hostname | select(. != null)' $CONFIG_FILE_LOCATION | xargs -I {} echo "Would process {}";
fi