diff --git a/Dockerfile b/Dockerfile index f1b2c40..a8586ae 100644 --- a/Dockerfile +++ b/Dockerfile @@ -1,9 +1,11 @@ FROM python:3-alpine ENTRYPOINT ["dumb-init", "--"] CMD ["proxy"] -RUN apk add --no-cache -t .build build-base &&\ +HEALTHCHECK CMD ["healthcheck"] +RUN apk add --no-cache -t .build build-base curl-dev &&\ apk add --no-cache socat &&\ - pip install --no-cache-dir dnspython dumb-init &&\ + apk add --no-cache libcurl &&\ + pip install --no-cache-dir dnspython dumb-init pycurl &&\ apk del .build ENV NAMESERVERS="208.67.222.222 8.8.8.8 208.67.220.220 8.8.4.4" \ PORT="80 443" \ @@ -11,8 +13,14 @@ ENV NAMESERVERS="208.67.222.222 8.8.8.8 208.67.220.220 8.8.4.4" \ MODE=tcp \ VERBOSE=0 \ MAX_CONNECTIONS=100 \ - UDP_ANSWERS=1 + UDP_ANSWERS=1 \ + HTTP_HEALTHCHECK=0\ + HTTP_HEALTHCHECK_URL="http://\$TARGET/"\ + SMTP_HEALTHCHECK=0\ + SMTP_HEALTHCHECK_URL="smtp://\$TARGET/"\ + SMTP_HEALTHCHECK_COMMAND="HELP" COPY proxy.py /usr/local/bin/proxy +COPY healthcheck.py /usr/local/bin/healthcheck # Labels ARG BUILD_DATE diff --git a/README.md b/README.md index 9c3fb05..0c3a5b2 100644 --- a/README.md +++ b/README.md @@ -35,6 +35,36 @@ Use these environment variables: Required. It's the host name where the incoming connections will be redirected to. +### `HTTP_HEALTHCHECK` + +Default: `0` + +Set to `1` to enable healthcheck with pycurl http requests. This is useful if the target +uses a deployment where the ip of the service gets changed frequently (e.g. +`accounts.google.com`) and you are using [`PRE_RESOLVE`](#pre_resolve) + +#### Automatically restarting unhealthy proxies + +When you enable the http healthcheck the container marks itself as unhealthy but does +nothing. (see https://github.com/moby/moby/pull/22719) + +If you want to restart your proxies automatically, you can use +https://github.com/willfarrell/docker-autoheal. + +### `HTTP_HEALTHCHECK_URL` + +Default: `http://$TARGET/` + +Url to use in [`HTTP_HEALTHCHECK`](#http_healthcheck) if enabled. `$TARGET` gets +replaced inside the url by the configured [`TARGET`](#target). + +### `HTTP_HEALTHCHECK_TIMEOUT_MS` + +Default: `2000` + +Timeout in milliseconds for http healthcheck. This is used as a timeout for connecting +and receiving an answer. You may end up with twice the time spend. + ### `MODE` Default: `tcp` @@ -94,6 +124,39 @@ Set to `1` to force using the specified [nameservers](#nameservers) to resolve t This is especially useful when using a network alias to whitelist an external API. +### `SMTP_HEALTHCHECK` + +Default: `0` + +Set to `1` to enable healthcheck with pycurl smtp requests. This is useful if the target +uses a deployment where the ip of the service gets changed frequently (e.g. +`smtp.eu.sparkpostmail.com`) and you are using [`PRE_RESOLVE`](#pre_resolve) + +#### Automatically restarting unhealthy proxies + +see [HTTP_HEALTHCHECK](#http_healthcheck) + +### `SMTP_HEALTHCHECK_URL` + +Default: `smtp://$TARGET/` + +Url to use in [`SMTP_HEALTHCHECK`](#smtp_healthcheck) if enabled. `$TARGET` gets +replaced inside the url by the configured [`TARGET`](#target). + +### `SMTP_HEALTHCHECK_COMMAND` + +Default: `HELP` + +Enables changing the healthcheck command for servers that do not support `HELP` (e.g. +for [MailHog](https://github.com/mailhog/MailHog) you can use `QUIT`) + +### `SMTP_HEALTHCHECK_TIMEOUT_MS` + +Default: `2000` + +Timeout in milliseconds for smtp healthcheck. This is used as a timeout for connecting +and receiving an answer. You may end up with twice the time spend. + ### `UDP_ANSWERS` Default: `1` diff --git a/healthcheck.py b/healthcheck.py new file mode 100755 index 0000000..e90e10e --- /dev/null +++ b/healthcheck.py @@ -0,0 +1,184 @@ +#!/usr/bin/env python3 + +import logging +import os + +logging.basicConfig(level=logging.INFO) +logger = logging.getLogger("healthcheck") + + +def error(message, exception=None): + logger.error(message) + if exception is None: + exit(1) + else: + raise exception + + +def http_healthcheck(): + """ + Use pycurl to check if the target server is still responding via proxy.py + :return: None + """ + import re + + import pycurl + + check_url = os.environ.get("HTTP_HEALTHCHECK_URL", "http://localhost/") + check_timeout_ms = int(os.environ.get("HTTP_HEALTHCHECK_TIMEOUT_MS", 2000)) + target = os.environ.get("TARGET", "localhost") + check_url_with_target = check_url.replace("$TARGET", target) + port = re.search("https?://[^:]*(?::([^/]+))?", check_url_with_target)[1] or "80" + print("checking %s via 127.0.0.1" % check_url_with_target) + logger.info("checking %s via 127.0.0.1" % check_url_with_target) + try: + request = pycurl.Curl() + request.setopt(pycurl.URL, check_url_with_target) + # do not send the request to the target directly but use our own socat proxy process to check if it's still + # working + request.setopt(pycurl.RESOLVE, ["{}:{}:127.0.0.1".format(target, port)]) + request.setopt(pycurl.CONNECTTIMEOUT_MS, check_timeout_ms) + request.setopt(pycurl.TIMEOUT_MS, check_timeout_ms) + request.perform() + request.close() + except pycurl.error as e: + error("error while checking http connection", e) + + +def smtp_healthcheck(): + """ + Use pycurl to check if the target server is still responding via proxy.py + :return: None + """ + import re + + import pycurl + + check_url = os.environ.get("SMTP_HEALTHCHECK_URL", "smtp://localhost/") + check_command = os.environ.get("SMTP_HEALTHCHECK_COMMAND", "HELP") + check_timeout_ms = int(os.environ.get("SMTP_HEALTHCHECK_TIMEOUT_MS", 2000)) + target = os.environ.get("TARGET", "localhost") + check_url_with_target = check_url.replace("$TARGET", target) + port = re.search("smtp://[^:]*(?::([^/]+))?", check_url_with_target)[1] or "25" + logger.info("checking %s via 127.0.0.1" % check_url_with_target) + try: + request = pycurl.Curl() + request.setopt(pycurl.URL, check_url_with_target) + request.setopt(pycurl.CUSTOMREQUEST, check_command) + # do not send the request to the target directly but use our own socat proxy process to check if it's still + # working + request.setopt(pycurl.RESOLVE, ["{}:{}:127.0.0.1".format(target, port)]) + request.setopt(pycurl.CONNECTTIMEOUT_MS, check_timeout_ms) + request.setopt(pycurl.TIMEOUT_MS, check_timeout_ms) + request.perform() + request.close() + except pycurl.error as e: + error("error while checking smtp connection", e) + + +def process_healthcheck(): + """ + Check that at least one socat process exists per port and no more than the number of configured max connections + processes exist for each port. + :return: + """ + import subprocess + + ports = os.environ["PORT"].split() + max_connections = int(os.environ["MAX_CONNECTIONS"]) + logger.info( + "checking socat processes for port(s) %s having at least one and less than %d socat processes" + % (ports, max_connections) + ) + socat_processes = ( + subprocess.check_output(["sh", "-c", "grep -R socat /proc/[0-9]*/cmdline"]) + .decode("utf-8") + .split("\n") + ) + pids = [process.split("/")[2] for process in socat_processes if process] + if len(pids) < len(ports): + # if we have less than the number of ports socat processes we do not need to count processes per port and can + # fail fast + error("Expected at least %d socat processes" % len(ports)) + port_process_count = {port: 0 for port in ports} + for pid in pids: + # foreach socat pid we detect the port it's for by checking the last argument (connect to) that ends with + # :{ip}:{port} for our processes + try: + with open("/proc/%d/cmdline" % int(pid)) as fp: + # arguments in /proc/.../cmdline are split by null bytes + cmd = [part for part in "".join(fp.readlines()).split("\x00") if part] + port = cmd[2].split(":")[-1] + port_process_count[port] = port_process_count[port] + 1 + except FileNotFoundError: + # ignore processes no longer existing (possibly retrieved an answer) + pass + for port in ports: + if port_process_count[port] == 0: + error("Missing socat process(es) for port: %s" % port) + if port_process_count[port] >= max_connections + 1: + error( + "More than %d + 1 socat process(es) for port: %s" + % (max_connections, port) + ) + + +def preresolve_healthcheck(): + """ + Check that the pre-resolved ip is still valid now for target + :return: + """ + from tempfile import gettempdir + + load_balancing_dns_fs_flag = os.path.join( + gettempdir(), "load_balancing_dns_detected" + ) + if not os.path.exists(load_balancing_dns_fs_flag): + # only run the resolver check if a previous run didn't flag the target as being dns load-balanced + import subprocess + + from dns.resolver import Resolver + + pre_resolved_ips = { + line.split(":")[2] + for line in subprocess.check_output( + ["sh", "-c", "grep -R '\\(udp\\|tcp\\)-connect:' /proc/[0-9]*/cmdline"] + ) + .decode("utf-8") + .split("\n") + if line + } + resolver = Resolver() + resolver.nameservers = os.environ["NAMESERVERS"].split() + target = os.environ["TARGET"] + resolved_ips = [answer.address for answer in resolver.resolve(target)] + for ip in pre_resolved_ips: + logger.info(f"checking {target} resolves to {ip}") + if ip not in resolved_ips: + resolved_ips_2 = [answer.address for answer in resolver.resolve(target)] + if resolved_ips_2 == resolved_ips: + error( + f"{target} no longer resolves to {ip}, {resolved_ips}, {resolved_ips_2}" + ) + else: + resolved_ips_3 = [ + answer.address for answer in resolver.resolve(target) + ] + # to make sure we didn't just hit the server switch in dns, we check again before deactivating + # the healthcheck permanently (until the container restarts) + if resolved_ips_3 != resolved_ips_2: + logger.info( + f"{target} seems to be load-balancing with dns ({resolved_ips} != {resolved_ips_2}), " + f"deactivating the resolver healthcheck" + ) + with open(f"{load_balancing_dns_fs_flag}", "w") as fp: + fp.write(target) + + +process_healthcheck() +if os.environ["PRE_RESOLVE"] == "1": + preresolve_healthcheck() +if os.environ.get("HTTP_HEALTHCHECK", "0") == "1": + http_healthcheck() +if os.environ.get("SMTP_HEALTHCHECK", "0") == "1": + smtp_healthcheck() diff --git a/poetry.lock b/poetry.lock index d1e474c..c1ef8c3 100644 --- a/poetry.lock +++ b/poetry.lock @@ -1,40 +1,25 @@ +# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand. + [[package]] name = "appdirs" version = "1.4.4" description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"." -category = "dev" optional = false python-versions = 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restart: unless-stopped + environment: + AUTOHEAL_INTERVAL: 1 + AUTOHEAL_CONTAINER_LABEL: "AUTOHEAL_${COMPOSE_PROJECT_NAME}" + privileged: "${OS_NEEDS_PRIVILEGES_FOR_DOCKER_SOCK:-false}" + volumes: + - /var/run/docker.sock:/var/run/docker.sock + + proxy_preresolve: + build: + dockerfile: Dockerfile + context: .. + labels: + - "AUTOHEAL_${COMPOSE_PROJECT_NAME}=true" + depends_on: + - target + - autoheal + networks: + default: + aliases: + - target_preresolve.example.com + simulated_outside: + environment: + TARGET: target.example.com + PRE_RESOLVE: 1 + NAMESERVERS: "127.0.0.11" #use local docker nameserver + HTTP_HEALTHCHECK: 1 + HTTP_HEALTHCHECK_TIMEOUT_MS: 200 + healthcheck: + test: ["CMD", "healthcheck"] + interval: 1s + timeout: 1s + retries: 0 + start_period: 1s + restart: unless-stopped + + proxy_without_preresolve: + build: + dockerfile: Dockerfile + context: .. + labels: + - "AUTOHEAL_${COMPOSE_PROJECT_NAME}=true" + depends_on: + - target + - autoheal + networks: + default: + aliases: + - target_without_preresolve.example.com + simulated_outside: + environment: + TARGET: target.example.com + # use no pre resolving (target gets resolved on every request) + PRE_RESOLVE: 0 + NAMESERVERS: "127.0.0.11" #use local docker nameserver + HTTP_HEALTHCHECK: 1 + HTTP_HEALTHCHECK_TIMEOUT_MS: 200 + healthcheck: + test: ["CMD", "healthcheck"] + interval: 1s + timeout: 1s + retries: 0 + start_period: 1s + restart: unless-stopped + + proxy_smtp: + build: + dockerfile: Dockerfile + context: .. + labels: + - "AUTOHEAL_${COMPOSE_PROJECT_NAME}=true" + depends_on: + - target_smtp + - autoheal + networks: + default: + aliases: + - target_smtp.example.com + simulated_outside: + environment: + TARGET: smtp.example.com + PORT: 1025 + PRE_RESOLVE: 1 + NAMESERVERS: "127.0.0.11" #use local docker nameserver + SMTP_HEALTHCHECK: 1 + SMTP_HEALTHCHECK_URL: "smtp://$$TARGET:1025/" + # mailhog doesn't support HELP command + SMTP_HEALTHCHECK_COMMAND: "QUIT" + SMTP_HEALTHCHECK_TIMEOUT_MS: 200 + healthcheck: + test: ["CMD", "healthcheck"] + interval: 1s + timeout: 1s + retries: 0 + start_period: 1s + restart: unless-stopped + + target: + image: nginx + networks: + simulated_outside: + aliases: + - target.example.com + + target_smtp: + image: mailhog/mailhog + networks: + simulated_outside: + aliases: + - smtp.example.com + + target_firewalled_not_responding: + image: python:3.9 + volumes: + - ./not_responding_tcp_port.py:/bin/not_responding_tcp_port + command: ["not_responding_tcp_port", "0.0.0.0", "80"] + networks: + simulated_outside: + aliases: + - target.example.com + + target_smtp_firewalled_not_responding: + image: python:3.9 + volumes: + - ./not_responding_tcp_port.py:/bin/not_responding_tcp_port + command: ["not_responding_tcp_port", "0.0.0.0", "25"] + networks: + simulated_outside: + aliases: + - smtp.example.com + +networks: + # we do not allow communication to the outside + simulated_outside: + internal: true + default: + internal: true diff --git a/tests/not_responding_tcp_port.py b/tests/not_responding_tcp_port.py new file mode 100755 index 0000000..14a6720 --- /dev/null +++ b/tests/not_responding_tcp_port.py @@ -0,0 +1,31 @@ +#!/usr/bin/env python3 +""" +this is a server that accepts TCP connections but doesn't send any response. it just closes the connection after an hour +has passed. this is intended for testing timeouts only. +""" + +import socket +import sys +import time + + +def keep_client_waiting(server_socket): + client, address = server_socket.accept() + print("connected") + server_socket.setblocking(0) + time.sleep(3600) + print("waited for an hour") + server_socket.close() + + +def start_server(): + listen_address = sys.argv[1] if len(sys.argv) > 1 else "" + listen_port = int(sys.argv[2]) if len(sys.argv) > 2 else 80 + server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) + server_socket.bind((listen_address, listen_port)) + server_socket.listen() + keep_client_waiting(server_socket) + + +if __name__ == "__main__": + start_server() diff --git a/tests/test_healtcheck.py b/tests/test_healtcheck.py new file mode 100644 index 0000000..c0bfd2c --- /dev/null +++ b/tests/test_healtcheck.py @@ -0,0 +1,215 @@ +import hashlib +import json +import logging +import os.path +from datetime import datetime +from time import sleep + +import plumbum.commands.processes +import pytest +from plumbum import TF, local +from plumbum.cmd import docker, docker_compose, which + +HEALTHCHECK_YAML = os.path.abspath("tests/healthcheck.yaml") + +PROXY_TARGET_PAIRS = [ + ("proxy_preresolve", "target"), + ("proxy_smtp", "target_smtp"), + ("proxy_without_preresolve", "target"), +] + +logger = logging.getLogger() + +_healthcheck = docker_compose["-f", HEALTHCHECK_YAML] +_get_container_id = _healthcheck["ps", "-q"] + + +def _get_container_id_and_ip(service_name): + container_id = _get_container_id(service_name).strip() + container_info = json.loads(docker("inspect", container_id)) + return ( + container_id, + container_info[0]["NetworkSettings"]["Networks"][ + "%s_simulated_outside" % local.env["COMPOSE_PROJECT_NAME"] + ]["IPAddress"], + ) + + +def _new_ip(target): + # we get the container id of the currently running target to be able to force changing ips by scaling up + # and then stopping the old container + old_container_id, old_ip = _get_container_id_and_ip(target) + + # start a second instance of the target + _healthcheck("up", "-d", "--scale", "%s=2" % target, target) + + # stop and remove the old container + docker("stop", old_container_id) + docker("rm", old_container_id) + + # verify that we got a new ip (should not be able to reuse the old one) + new_container_id, new_ip = _get_container_id_and_ip(target) + assert old_container_id != new_container_id + assert old_ip != new_ip + + +def _wait_for(proxy, message, callback, *args): + try: + while message not in callback(*args): + # try again in one second (to not hammer the CPU) + sleep(1) + except Exception: + # add additional infos to any error to make tracing down the error easier + logger.error("failed waiting for '%s'" % message) + logger.error(_healthcheck("logs", "autoheal")) + logger.error(_healthcheck("ps")) + logger.error(_healthcheck("exec", "-T", proxy, "healthcheck", retcode=None)) + raise + + +def _sha256(text): + return hashlib.sha256(str(text).encode("utf-8")).hexdigest() + + +@pytest.fixture(scope="session") +def os_needs_privileges(): + if which["getenforce"] & TF: + # if we can find getenforce on the current system, SELinux is probably installed and we need to start + # autoheal with privileges + return "true" + return "false" + + +@pytest.fixture(scope="function", autouse=True) +def _cleanup_docker_compose(tmp_path, os_needs_privileges): + with local.cwd(tmp_path): + custom_compose_project_name = "{}_{}".format( + os.path.basename(tmp_path), _sha256(tmp_path)[:6] + ) + with local.env( + COMPOSE_PROJECT_NAME=custom_compose_project_name, + OS_NEEDS_PRIVILEGES_FOR_DOCKER_SOCK=os_needs_privileges, + ) as env: + yield env + + # stop autoheal first to prevent it from restarting containers to be stopped + _healthcheck("stop", "autoheal") + _healthcheck("down", "-v") + + +@pytest.mark.parametrize("proxy,target", PROXY_TARGET_PAIRS) +def test_healthcheck_ok(proxy, target): + # given a started proxy with healthcheck + _healthcheck("up", "-d", proxy) + + # when everything is ok and target is Up + assert "Up" in _healthcheck("ps", target) + + # then healthcheck should be successful + _healthcheck("exec", "-T", proxy, "healthcheck") + + +@pytest.mark.parametrize("proxy,target", PROXY_TARGET_PAIRS) +def test_healthcheck_failing(proxy, target): + # given a started proxy with healthcheck + _healthcheck("up", "-d", proxy) + # and autoheal not interfering + _healthcheck("stop", "autoheal") + + # when target is not reachable + _healthcheck("stop", target) + assert " Exit " in _healthcheck("ps", target) + + # then healthcheck should return an error (non zero exit code) + with pytest.raises( + plumbum.commands.processes.ProcessExecutionError, + match=r"Unexpected exit code: (1|137)", + ): + _healthcheck("exec", "-T", proxy, "healthcheck") + + +@pytest.mark.parametrize("proxy,target", PROXY_TARGET_PAIRS) +@pytest.mark.timeout(30) +def test_healthcheck_failing_firewalled(proxy, target): + # given a started proxy with healthcheck + _healthcheck("up", "-d", proxy) + # and autoheal not interfering + _healthcheck("stop", "autoheal") + + # when target stops responding + _healthcheck("stop", target) + assert " Exit " in _healthcheck("ps", target) + _healthcheck( + "up", "-d", "{target:s}_firewalled_not_responding".format(target=target) + ) + assert "Up" in _healthcheck( + "ps", "{target:s}_firewalled_not_responding".format(target=target) + ) + + # then healthcheck should return an error (non zero exit code) + with pytest.raises( + plumbum.commands.processes.ProcessExecutionError, + match=r"Unexpected exit code: (1|137)", + ): + start = datetime.now() + _healthcheck("exec", "-T", proxy, "healthcheck") + end = datetime.now() + # timeout is set to 200ms for tests, so the exception should be raised at earliest after 0.2s + # and at most 2s after starting considering overhead + # if it happens outside that timeframe (especially before 0.2s) the exception might hint to another error type + assert 0.2 < (end - start).total_seconds() < 2 + + +@pytest.mark.parametrize( + "proxy,target", + (p for p in PROXY_TARGET_PAIRS if p[0] != "proxy_without_preresolve"), +) +@pytest.mark.timeout(60) +def test_healthcheck_autoheal(proxy, target): + # given a started proxy with healthcheck + _healthcheck("up", "-d", proxy) + proxy_container_id = _get_container_id(proxy).strip() + # that was healthy + _wait_for(proxy, "Up (healthy)", _healthcheck, "ps", proxy) + + # when target gets a new ip + _new_ip(target) + + # then autoheal should restart the proxy + _wait_for( + proxy, + "(%s) found to be unhealthy - Restarting container now" + % proxy_container_id[:12], + _healthcheck, + "logs", + "autoheal", + ) + + # and the proxy should become healthy + _wait_for(proxy, "Up (healthy)", _healthcheck, "ps", proxy) + + # and healthcheck should be successful + _healthcheck("exec", "-T", proxy, "healthcheck") + + +def test_healthcheck_autoheal_proxy_without_preresolve(): + # given a started proxy with healthcheck + proxy = "proxy_without_preresolve" + _healthcheck("up", "-d", proxy) + # that was healthy + _wait_for(proxy, "Up (healthy)", _healthcheck, "ps", proxy) + + # when target gets a new ip + _new_ip("target") + + # then healthcheck should be always successful (we wait just for 5 seconds/healthchecks) + for _ in range(0, 5): + _healthcheck("exec", "-T", proxy, "healthcheck") + sleep(1) + + # and autoheal shouldn't have restarted anything + assert not [ + line + for line in _healthcheck("logs", "autoheal").split("\n") + if line and not line.startswith("Attaching to ") + ]