diff --git a/.github/dependabot.yml b/.github/dependabot.yml new file mode 100644 index 0000000..450c562 --- /dev/null +++ b/.github/dependabot.yml @@ -0,0 +1,23 @@ +version: 2 +updates: +- package-ecosystem: github-actions + directory: "/" + schedule: + interval: daily + time: "02:00" + timezone: Canada/Eastern + open-pull-requests-limit: 10 +- package-ecosystem: gomod + directory: "/" + schedule: + interval: daily + time: "02:00" + timezone: Canada/Eastern + open-pull-requests-limit: 10 +- package-ecosystem: docker + directory: "/" + schedule: + interval: daily + time: "02:00" + timezone: Canada/Eastern + open-pull-requests-limit: 10 diff --git a/.github/labeler.yml b/.github/labeler.yml new file mode 100644 index 0000000..58ac7aa --- /dev/null +++ b/.github/labeler.yml @@ -0,0 +1,11 @@ +documentation: +- docs/**/* +- '*.md' + +dependencies: +- go.mod +- go.sum + +build: +- .github/workflows/* +- Makefile diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml new file mode 100644 index 0000000..6eb2cca --- /dev/null +++ b/.github/workflows/build.yml @@ -0,0 +1,18 @@ +name: Build +on: [push] + +jobs: + test: + runs-on: ubuntu-20.04 + container: + image: ghcr.io/hairyhenderson/gomplate-ci-build:latest + steps: + - uses: actions/checkout@v2.3.4 + - run: make test + lint: + runs-on: ubuntu-20.04 + container: + image: ghcr.io/hairyhenderson/gomplate-ci-build:latest + steps: + - uses: actions/checkout@v2.3.4 + - run: make ci-lint diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml new file mode 100644 index 0000000..80f3061 --- /dev/null +++ b/.github/workflows/codeql-analysis.yml @@ -0,0 +1,68 @@ +name: "CodeQL" + +on: + push: + branches: [main] + pull_request: + # The branches below must be a subset of the branches above + branches: [main] + paths-ignore: + - '**/*.md' + schedule: + - cron: '0 1 * * 2' + +jobs: + analyze: + name: Analyze + runs-on: ubuntu-20.04 + + strategy: + fail-fast: false + matrix: + # Override automatic language detection by changing the below list + # Supported options are ['csharp', 'cpp', 'go', 'java', 'javascript', 'python'] + language: ['go'] + # Learn more... + # https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#overriding-automatic-language-detection + + steps: + - name: Checkout repository + uses: actions/checkout@v2.3.4 + with: + # We must fetch at least the immediate parents so that if this is + # a pull request then we can checkout the head. + fetch-depth: 2 + + # If this run was triggered by a pull request event, then checkout + # the head of the pull request instead of the merge commit. + - run: git checkout HEAD^2 + if: ${{ github.event_name == 'pull_request' }} + + # Initializes the CodeQL tools for scanning. + - name: Initialize CodeQL + uses: github/codeql-action/init@v1 + with: + languages: ${{ matrix.language }} + # If you wish to specify custom queries, you can do so here or in a config file. + # By default, queries listed here will override any specified in a config file. + # Prefix the list here with "+" to use these queries and those in the config file. + # queries: ./path/to/local/query, your-org/your-repo/queries@main + + # Autobuild attempts to build any compiled languages (C/C++, C#, or Java). + # If this step fails, then you should remove it and run the build manually (see below) + - name: Autobuild + uses: github/codeql-action/autobuild@v1 + + # ℹī¸ Command-line programs to run using the OS shell. + # 📚 https://git.io/JvXDl + + # ✏ī¸ If the Autobuild fails above, remove it and uncomment the following three lines + # and modify them (or add more) to build your code if your project + # uses a compiled language + + #- run: | + # make bootstrap + # make release + + - name: Perform CodeQL Analysis + uses: github/codeql-action/analyze@v1 diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml new file mode 100644 index 0000000..0521ca8 --- /dev/null +++ b/.github/workflows/docker.yml @@ -0,0 +1,72 @@ +name: Docker Build +on: + push: + +jobs: + docker-build: + runs-on: ubuntu-20.04 + services: + registry: + image: registry:2 + ports: + - '5000:5000' + env: + DOCKER_BUILDKIT: 1 + DOCKER_CLI_EXPERIMENTAL: enabled + IMG_NAME: henet-ipupdater + steps: + - name: enable experimental mode + run: | + mkdir -p ~/.docker + echo '{"experimental": "enabled"}' > ~/.docker/config.json + - uses: actions/checkout@v2 + - name: Set up QEMU + uses: docker/setup-qemu-action@v1.2.0 + - name: Set up Docker Buildx + id: buildx + uses: docker/setup-buildx-action@v1.6.0 + with: + version: v0.5.1 + driver-opts: | + image=moby/buildkit:buildx-stable-1 + network=host + - name: Available platforms + run: echo ${{ steps.buildx.outputs.platforms }} + - name: determine if this is a tag + run: | + if (git describe --abbrev=0 --exact-match &>/dev/null); then + tag=$(git describe --abbrev=0 --exact-match) + echo "is_tag=true" >> $GITHUB_ENV + echo "git_tag=$tag" >> $GITHUB_ENV + # splits the major version from $tag - assumes it's a 3-part semver + echo "major_version=${tag%%\.*}" >> $GITHUB_ENV + fi + if: github.repository == 'hairyhenderson/henet-ipupdater' + - name: Login to DockerHub + uses: docker/login-action@v1.10.0 + with: + username: hairyhenderson + password: ${{ secrets.DOCKERHUB_TOKEN }} + if: github.repository == 'hairyhenderson/henet-ipupdater' && (github.ref == 'refs/heads/main' || env.is_tag == 'true') + - name: Build & Push (non-main branch) + run: | + set -ex + make docker-multi COMMIT=${{ github.sha }} DOCKER_REPO=localhost:5000/${IMG_NAME} BUILDX_ACTION=--push + + docker buildx imagetools create --dry-run -t localhost:5000/${IMG_NAME}:dev localhost:5000/${IMG_NAME}:latest + docker buildx imagetools create --dry-run -t localhost:5000/${IMG_NAME}:dev-alpine localhost:5000/${IMG_NAME}:alpine + if: github.repository != 'hairyhenderson/henet-ipupdater' || github.ref != 'refs/heads/main' + - name: Build & Push (main branch) + run: | + make docker-multi COMMIT=${{ github.sha }} DOCKER_REPO=hairyhenderson/${IMG_NAME} BUILDX_ACTION=--push + if: github.repository == 'hairyhenderson/henet-ipupdater' && github.ref == 'refs/heads/main' + - name: Build & Push (tagged release) + run: | + make docker-multi COMMIT=${{ github.sha }} DOCKER_REPO=hairyhenderson/${IMG_NAME} BUILDX_ACTION=--push + + set -x + docker buildx imagetools create -t hairyhenderson/${IMG_NAME}:${git_tag} hairyhenderson/${IMG_NAME}:latest + docker buildx imagetools create -t hairyhenderson/${IMG_NAME}:${major_version} hairyhenderson/${IMG_NAME}:latest + docker buildx imagetools create -t hairyhenderson/${IMG_NAME}:${git_tag}-alpine hairyhenderson/${IMG_NAME}:alpine + docker buildx imagetools create -t hairyhenderson/${IMG_NAME}:${major_version}-alpine hairyhenderson/${IMG_NAME}:alpine + if: github.repository == 'hairyhenderson/henet-ipupdater' && env.is_tag == 'true' diff --git a/.github/workflows/label.yml b/.github/workflows/label.yml new file mode 100644 index 0000000..1f645db --- /dev/null +++ b/.github/workflows/label.yml @@ -0,0 +1,11 @@ +name: Labeler +on: + pull_request_target: + +jobs: + label: + runs-on: ubuntu-latest + steps: + - uses: actions/labeler@v3 + with: + repo-token: "${{ secrets.GITHUB_TOKEN }}" diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..602552f --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +ipupdater +bin/ diff --git a/.golangci.yml b/.golangci.yml new file mode 100644 index 0000000..094b151 --- /dev/null +++ b/.golangci.yml @@ -0,0 +1,73 @@ +linters-settings: + govet: + check-shadowing: true + enable: + - fieldalignment + golint: + min-confidence: 0 + gocyclo: + min-complexity: 10 + goconst: + min-len: 2 + min-occurrences: 4 + lll: + line-length: 140 + nolintlint: + allow-leading-space: true # don't require machine-readable nolint directives (i.e. with no leading space) + allow-unused: false # report any unused nolint directives + require-explanation: false # don't require an explanation for nolint directives + require-specific: false # don't require nolint directives to be specific about which linter is being skipped + +linters: + disable-all: true + enable: + - asciicheck + - bodyclose + - deadcode + - depguard + - dogsled + - dupl + - errcheck + - exhaustive + - exportloopref + - funlen + - gci + # - gochecknoglobals + - gochecknoinits + - gocognit + - goconst + - gocritic + - gocyclo + - godox + - gofmt + - gofumpt + - goheader + - goimports + # - gomnd + - gomodguard + - goprintffuncname + - gosec + - gosimple + - govet + - ineffassign + - lll + - misspell + - nakedret + - nestif + - nlreturn + - noctx + - nolintlint + - prealloc + - revive + - rowserrcheck + - sqlclosecheck + - staticcheck + - structcheck + - stylecheck + - typecheck + - unconvert + - unparam + - unused + - varcheck + - whitespace + - wsl diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..4cb09f0 --- /dev/null +++ b/Dockerfile @@ -0,0 +1,67 @@ +# syntax=docker/dockerfile:1.2.1-labs +FROM --platform=linux/amd64 golang:1.17.2-alpine AS build + +ARG PKG_NAME +ARG TARGETOS +ARG TARGETARCH +ARG TARGETVARIANT +ENV GOOS=$TARGETOS GOARCH=$TARGETARCH + +RUN apk add --no-cache make git + +WORKDIR /src +COPY go.mod ./ +COPY go.sum ./ + +RUN --mount=type=cache,id=go-build-${TARGETOS}-${TARGETARCH}${TARGETVARIANT},target=/root/.cache/go-build \ + --mount=type=cache,id=go-pkg-${TARGETOS}-${TARGETARCH}${TARGETVARIANT},target=/go/pkg \ + go mod download -x + +COPY . ./ + +RUN --mount=type=cache,id=go-build-${TARGETOS}-${TARGETARCH}${TARGETVARIANT},target=/root/.cache/go-build \ + --mount=type=cache,id=go-pkg-${TARGETOS}-${TARGETARCH}${TARGETVARIANT},target=/go/pkg \ + make build +RUN mv bin/${PKG_NAME}* /bin/ + +FROM scratch AS release-linux + +ARG PKG_NAME +ARG VCS_REF +ARG TARGETOS +ARG TARGETARCH +ARG TARGETVARIANT + +LABEL org.opencontainers.image.revision=$VCS_REF \ + org.opencontainers.image.source="https://github.com/hairyhenderson/${PKG_NAME}" + +COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt +COPY --from=build /bin/${PKG_NAME}_${TARGETOS}-${TARGETARCH}${TARGETVARIANT} /${PKG_NAME} + +ENTRYPOINT [ "/ipupdater" ] + +FROM alpine:3.14.2 AS alpine + +ARG PKG_NAME +ARG VCS_REF +ARG TARGETOS +ARG TARGETARCH +ARG TARGETVARIANT + +LABEL org.opencontainers.image.revision=$VCS_REF \ + org.opencontainers.image.source="https://github.com/hairyhenderson/${PKG_NAME}" + +COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt +COPY --from=build /bin/${PKG_NAME}_${TARGETOS}-${TARGETARCH}${TARGETVARIANT} /${PKG_NAME} + +ENTRYPOINT [ "/ipupdater" ] + +FROM --platform=windows/amd64 mcr.microsoft.com/windows/nanoserver:2009 AS release-windows + +ARG PKG_NAME +ARG TARGETOS +ARG TARGETARCH +ARG TARGETVARIANT +COPY --from=build /bin/${PKG_NAME}_${TARGETOS}-${TARGETARCH}${TARGETVARIANT}.exe /${PKG_NAME}.exe + +FROM release-$TARGETOS AS release diff --git a/Dockerfile.armhf b/Dockerfile.armhf deleted file mode 100644 index f45cdd4..0000000 --- a/Dockerfile.armhf +++ /dev/null @@ -1,9 +0,0 @@ -FROM armhf/alpine:3.5 - -RUN apk add --no-cache curl -COPY ipupdater.sh / - -# amount of time to sleep, in seconds -ENV DELAY 360 - -CMD [ "/ipupdater.sh" ] diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..9ebdd3b --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2016,2021 Dave Henderson + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..e8adc21 --- /dev/null +++ b/Makefile @@ -0,0 +1,110 @@ +.DEFAULT_GOAL = build +extension = $(patsubst windows,.exe,$(filter windows,$(1))) +GO := go +PKG_NAME := ipupdater +PREFIX := . +DOCKER_REPO ?= hairyhenderson/$(PKG_NAME) +DOCKER_LINUX_PLATFORMS ?= linux/amd64,linux/arm64,linux/arm/v6,linux/arm/v7 +DOCKER_PLATFORMS ?= $(DOCKER_LINUX_PLATFORMS),windows/amd64 +BUILDX_ACTION ?= --output=type=image,push=false +# we just load by default, as a "dry run" +# BUILDX_ACTION ?= --load +TAG_LATEST ?= latest +TAG_ALPINE ?= alpine + +COMMIT ?= `git rev-parse --short HEAD 2>/dev/null` +VERSION ?= `git describe --abbrev=0 --tags $(git rev-list --tags --max-count=1) 2>/dev/null | sed 's/v\(.*\)/\1/'` + +COMMIT_FLAG := -X `go list ./internal/version`.GitCommit=$(COMMIT) +VERSION_FLAG := -X `go list ./internal/version`.Version=$(VERSION) + +GOOS ?= $(shell go version | sed 's/^.*\ \([a-z0-9]*\)\/\([a-z0-9]*\)/\1/') +GOARCH ?= $(shell go version | sed 's/^.*\ \([a-z0-9]*\)\/\([a-z0-9]*\)/\2/') + +ifeq ("$(TARGETVARIANT)","") +ifneq ("$(GOARM)","") +TARGETVARIANT := v$(GOARM) +endif +else +ifeq ("$(GOARM)","") +GOARM ?= $(subst v,,$(TARGETVARIANT)) +endif +endif + +clean: + rm -Rf $(PREFIX)/bin/* + rm -f $(PREFIX)/*.[ci]id + +$(PREFIX)/bin/$(PKG_NAME)_%v5$(call extension,$(GOOS)): $(shell find $(PREFIX) -type f -name "*.go") + GOOS=$(shell echo $* | cut -f1 -d-) GOARCH=$(shell echo $* | cut -f2 -d- ) GOARM=5 CGO_ENABLED=0 \ + $(GO) build \ + -ldflags "-w -s $(COMMIT_FLAG) $(VERSION_FLAG)" \ + -o $@ \ + ./cmd/$(PKG_NAME) + +$(PREFIX)/bin/$(PKG_NAME)_%v6$(call extension,$(GOOS)): $(shell find $(PREFIX) -type f -name "*.go") + GOOS=$(shell echo $* | cut -f1 -d-) GOARCH=$(shell echo $* | cut -f2 -d- ) GOARM=6 CGO_ENABLED=0 \ + $(GO) build \ + -ldflags "-w -s $(COMMIT_FLAG) $(VERSION_FLAG)" \ + -o $@ \ + ./cmd/$(PKG_NAME) + +$(PREFIX)/bin/$(PKG_NAME)_%v7$(call extension,$(GOOS)): $(shell find $(PREFIX) -type f -name "*.go") + GOOS=$(shell echo $* | cut -f1 -d-) GOARCH=$(shell echo $* | cut -f2 -d- ) GOARM=7 CGO_ENABLED=0 \ + $(GO) build \ + -ldflags "-w -s $(COMMIT_FLAG) $(VERSION_FLAG)" \ + -o $@ \ + ./cmd/$(PKG_NAME) + +$(PREFIX)/bin/$(PKG_NAME)_windows-%.exe: $(shell find $(PREFIX) -type f -name "*.go") + GOOS=windows GOARCH=$* GOARM= CGO_ENABLED=0 \ + $(GO) build \ + -ldflags "-w -s $(COMMIT_FLAG) $(VERSION_FLAG)" \ + -o $@ \ + ./cmd/$(PKG_NAME) + +$(PREFIX)/bin/$(PKG_NAME)_%$(TARGETVARIANT)$(call extension,$(GOOS)): $(shell find $(PREFIX) -type f -name "*.go") + GOOS=$(shell echo $* | cut -f1 -d-) GOARCH=$(shell echo $* | cut -f2 -d- ) GOARM=$(GOARM) CGO_ENABLED=0 \ + $(GO) build \ + -ldflags "-w -s $(COMMIT_FLAG) $(VERSION_FLAG)" \ + -o $@ \ + ./cmd/$(PKG_NAME) + +$(PREFIX)/bin/$(PKG_NAME)$(call extension,$(GOOS)): $(PREFIX)/bin/$(PKG_NAME)_$(GOOS)-$(GOARCH)$(TARGETVARIANT)$(call extension,$(GOOS)) + cp $< $@ + +build: $(PREFIX)/bin/$(PKG_NAME)_$(GOOS)-$(GOARCH)$(TARGETVARIANT)$(call extension,$(GOOS)) $(PREFIX)/bin/$(PKG_NAME)$(call extension,$(GOOS)) + +docker-multi: Dockerfile + docker buildx build \ + --build-arg VCS_REF=$(COMMIT) \ + --build-arg PKG_NAME=$(PKG_NAME) \ + --platform $(DOCKER_PLATFORMS) \ + --tag $(DOCKER_REPO):$(TAG_LATEST) \ + --target release \ + $(BUILDX_ACTION) . + docker buildx build \ + --build-arg VCS_REF=$(COMMIT) \ + --build-arg PKG_NAME=$(PKG_NAME) \ + --platform $(DOCKER_LINUX_PLATFORMS) \ + --tag $(DOCKER_REPO):$(TAG_ALPINE) \ + --target alpine \ + $(BUILDX_ACTION) . + +ifeq ($(OS),Windows_NT) +test: + $(GO) test -coverprofile=c.out ./... +else +test: + $(GO) test -race -coverprofile=c.out ./... +endif + +lint: + @golangci-lint run --verbose --max-same-issues=0 --max-issues-per-linter=0 --sort-results + +ci-lint: + @golangci-lint run --verbose --max-same-issues=0 --max-issues-per-linter=0 --sort-results --out-format=github-actions + +.PHONY: clean test build lint ci-lint +.DELETE_ON_ERROR: +.SECONDARY: diff --git a/README.md b/README.md index 43b3eaf..1efaf8b 100644 --- a/README.md +++ b/README.md @@ -2,20 +2,12 @@ # hairyhenderson/henet-ipupdater -A simple script to periodically update the correct IPv4 client IP for IPv6 tunnels from https://tunnelbroker.he.net. - -It runs in a Docker container, and exits after a given delay. Docker's `--restart=always` can be used to ensure this runs in a continuous loop. +A program that periodically updates dynamic IPs. ## Usage ```console -$ docker run -d -e DELAY=720 -e HOSTNAME=foo.example.com -e APIKEY=bar --restart=always hairyhenderson/henet-ipupdater +$ ipupdater -h ``` -## License - -[The MIT License](http://opensource.org/licenses/MIT) - -Copyright (c) 2016-2019 Dave Henderson - [arm-arch-image]: https://img.shields.io/badge/built%20for-ARM-blue.svg?style=flat diff --git a/cmd/ipupdater/main.go b/cmd/ipupdater/main.go new file mode 100644 index 0000000..6b50121 --- /dev/null +++ b/cmd/ipupdater/main.go @@ -0,0 +1,123 @@ +/* +The ipupdater command + +*/ +package main + +import ( + "context" + "flag" + "fmt" + "net" + "net/http" + "os" + "os/signal" + "syscall" + "time" + + ipupdater "github.com/hairyhenderson/henet-ipupdater" + "github.com/prometheus/client_golang/prometheus/promhttp" +) + +var ( + verbose bool + domain string + interval time.Duration + key string + oneshot bool + ip net.IP + enableMetrics bool + endpoint string +) + +func run(ctx context.Context) error { + ctx, stop := signal.NotifyContext(ctx, os.Interrupt, os.Kill, syscall.SIGTERM) + defer stop() + + u := ipupdater.New(domain, key, endpoint, ip) + + if enableMetrics { + http.Handle("/metrics", promhttp.Handler()) + + go func() { + _ = http.ListenAndServe(":8080", nil) + }() + } + + done := make(chan error) + + if oneshot { + go func() { + _, err := u.Update(ctx) + done <- err + }() + } else { + go func() { + err := u.Loop(ctx, interval) + done <- err + }() + } + + select { + case err := <-done: + return err + case <-ctx.Done(): + return ctx.Err() + } +} + +func main() { + if err := mainrun(os.Args); err != nil { + fmt.Fprintln(os.Stderr, err) + os.Exit(1) + } +} + +func mainrun(args []string) error { + prog := args[0] + + fs := flag.NewFlagSet("root", flag.ContinueOnError) + fs.Usage = func() { + fmt.Fprintf(os.Stderr, "Usage of %s:\nA program that periodically updates dynamic IPs\n", prog) + fs.PrintDefaults() + } + fs.StringVar(&domain, "d", "", "domain to update the IP for") + fs.DurationVar(&interval, "i", 5*time.Minute, "update interval") + fs.StringVar(&key, "k", "", "API Key") + fs.BoolVar(&oneshot, "1", false, "update just once instead of looping") + fs.Var(&ipVar{ip}, "ip", "force the IP address to this value (default: autodetected)") + fs.StringVar(&endpoint, "e", "https://dyn.dns.he.net/nic/update", + "the dynamic DNS URL to communicate with (only HE.net supported for now)") + + fs.BoolVar(&enableMetrics, "m", true, "enable Prometheus metrics") + + fs.BoolVar(&verbose, "d", false, "Output extra logs") + + err := fs.Parse(args[1:]) + if err != nil { + return err + } + + err = run(context.Background()) + if err != nil { + return fmt.Errorf("%s failed: %w", prog, err) + } + + return nil +} + +type ipVar struct { + net.IP +} + +// String implements flag.Value. +func (c ipVar) String() string { + return c.IP.String() +} + +// Set implements flag.Value. +func (c *ipVar) Set(s string) error { + c.IP = net.ParseIP(s) + + return nil +} diff --git a/errors.go b/errors.go new file mode 100644 index 0000000..e9770ba --- /dev/null +++ b/errors.go @@ -0,0 +1,19 @@ +package ipupdater + +// ClientError - an error that's the client's fault (probably bad domain or key) +type ClientError struct { + status string +} + +func (e ClientError) Error() string { + return "client error: " + e.status +} + +// ServerError - a server-side error, usually temporary +type ServerError struct { + status string +} + +func (e ServerError) Error() string { + return "server error: " + e.status +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..352fac9 --- /dev/null +++ b/go.mod @@ -0,0 +1,36 @@ +module github.com/hairyhenderson/henet-ipupdater + +go 1.17 + +require ( + github.com/pkg/errors v0.9.1 + github.com/prometheus/client_golang v1.11.0 + github.com/weaveworks/common v0.0.0-20211015155308-ebe5bdc2c89e +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect + github.com/cespare/xxhash/v2 v2.1.1 // indirect + github.com/go-kit/log v0.1.0 // indirect + github.com/go-logfmt/logfmt v0.5.0 // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect + github.com/opentracing/opentracing-go v1.1.0 // indirect + github.com/prometheus/client_model v0.2.0 // indirect + github.com/prometheus/common v0.26.0 // indirect + github.com/prometheus/procfs v0.6.0 // indirect + github.com/sirupsen/logrus v1.6.0 // indirect + github.com/uber/jaeger-client-go v2.28.0+incompatible // indirect + github.com/uber/jaeger-lib v2.2.0+incompatible // indirect + github.com/weaveworks/promrus v1.2.0 // indirect + go.uber.org/atomic v1.5.1 // indirect + golang.org/x/lint v0.0.0-20200130185559-910be7a94367 // indirect + golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f // indirect + golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect + golang.org/x/tools v0.0.0-20200216192241-b320d3a0f5a2 // indirect + golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect + google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55 // indirect + google.golang.org/grpc v1.26.0 // indirect + google.golang.org/protobuf v1.26.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..24990c2 --- /dev/null +++ b/go.sum @@ -0,0 +1,497 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0= +github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo= 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automatically by the build + Branch = "" + + // GoVersion - + GoVersion = runtime.Version() +) diff --git a/ipupdater.go b/ipupdater.go new file mode 100644 index 0000000..182d892 --- /dev/null +++ b/ipupdater.go @@ -0,0 +1,313 @@ +package ipupdater + +import ( + "context" + "fmt" + "io/ioutil" + "net" + "net/http" + "net/url" + "strings" + "time" + + "github.com/pkg/errors" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promhttp" +) + +var ( + // ip-checking service - must return a body with the IP only + checkipURL = "https://checkip.amazonaws.com" + + // The amount of time to wait after receiving a server error + serverErrorWaitTime = 3 * time.Second +) + +// Updater - +type Updater struct { + domain string + apikey string + url string + ip net.IP +} + +// New creates an updater +func New(domain, apikey, endpoint string, ip net.IP) *Updater { + return &Updater{ + domain: domain, + apikey: apikey, + ip: ip, + url: endpoint, + } +} + +// https://help.dyn.com/remote-access-api/return-codes/ +const ( + // Update Complete statuses + // + // Note that, for confirmation purposes, good and nochg messages will be + // followed by the IP address that the hostname was updated to. This value + // will be separated from the return code by a space. + StatusGood = "good" + StatusNoChange = "nochg" // maybe backoff from this one exponentially? + + // Hostname-related errors (must stop immediately) + StatusNotFQDN = "notfqdn" // The hostname specified is not a fully-qualified domain name + StatusNoHost = "nohost" // The hostname specified does not exist in this user account + StatusNumHost = "numhost" // Too many hosts specified in an update + StatusAbuse = "abuse" // The hostname specified is blocked for update abuse. + + // Account-Related Errors (must stop immediately) + StatusBadAuth = "badauth" // The username and password pair do not match a real user. + + // Agent-Related Errors + StatusBadAgent = "badagent" // The user agent was not sent or HTTP method is not permitted + + // Server Error Conditions - The client must not resume updating until 30 minutes have passed + StatusDNSErr = "dnserr" // DNS error encountered + Status911 = "911" // There is a problem or scheduled maintenance on our side. + StatusInterval = "interval" // Rate limiting - interval too tight +) + +// Update - +func (u *Updater) Update(ctx context.Context) (net.IP, error) { + success := false + + done := timeOp("Update", u.domain) + defer func(ctx context.Context) { + done(ctx, success) + }(ctx) + + data := url.Values{ + "hostname": []string{u.domain}, + "password": []string{u.apikey}, + } + if u.ip != nil { + data["myip"] = []string{u.ip.String()} + } + + client := createHTTPClient(u.url) + + req, err := http.NewRequestWithContext(ctx, http.MethodPost, u.url, strings.NewReader(data.Encode())) + if err != nil { + return nil, err + } + + req.Header.Set("Content-Type", "application/x-www-form-urlencoded") + + res, err := client.Do(req) + if err != nil { + updateErrorsMetric.WithLabelValues(u.domain, err.Error()).Inc() + + return nil, fmt.Errorf("failed to update: %w", err) + } + + defer res.Body.Close() + + if res.StatusCode > 299 { + updateErrorsMetric.WithLabelValues(u.domain, res.Status).Inc() + + return nil, fmt.Errorf("couldn't update IP for %s: %s", u.domain, res.Status) + } + + body, err := ioutil.ReadAll(res.Body) + if err != nil { + updateErrorsMetric.WithLabelValues(u.domain, "readfailed").Inc() + + return nil, fmt.Errorf("failed to read response body: %w", err) + } + // u.log.Debug().Str("body", string(body)).Msg("Update - received body") + + status, ip, err := parseBody(body) + if err != nil { + updateErrorsMetric.WithLabelValues(u.domain, status).Inc() + + return nil, err + } + + if status == StatusNoChange { + if u.ip != nil && !ip.Equal(u.ip) { + updateErrorsMetric.WithLabelValues(u.domain, "unexpected IP").Inc() + + return nil, errors.Errorf("unexpected IP on remote end: %s - expected %s (status %s)", ip, u.ip, status) + } + } + + if status == StatusGood { + lastUpdatedMetric.WithLabelValues(u.domain).SetToCurrentTime() + } + + u.ip = ip + currentIPMetric.WithLabelValues(u.domain, ip.String()).Set(1) + updatesMetric.WithLabelValues(u.domain, status).Inc() + + success = true + + // u.log.Debug().IPAddr("ip", ip).Str("status", status).Msg("Update") + + return nil, nil +} + +// CheckIP gets the current IP (requires a working internet connection) +func (u *Updater) CheckIP(ctx context.Context) (net.IP, error) { + success := false + + done := timeOp("CheckIP", u.domain) + defer func(ctx context.Context) { + done(ctx, success) + }(ctx) + + client := createHTTPClient(checkipURL) + + req, err := http.NewRequestWithContext(ctx, http.MethodGet, checkipURL, nil) + if err != nil { + return nil, err + } + + res, err := client.Do(req) + if err != nil { + checkErrorsMetric.WithLabelValues(u.domain, err.Error()).Inc() + + return nil, err + } + + defer res.Body.Close() + + if res.StatusCode > 299 { + checkErrorsMetric.WithLabelValues(u.domain, res.Status).Inc() + + return nil, errors.Errorf("couldn't check IP: %s", res.Status) + } + + body, err := ioutil.ReadAll(res.Body) + if err != nil { + checkErrorsMetric.WithLabelValues(u.domain, "readfailed").Inc() + + return nil, errors.Wrap(err, "failed to read response body") + } + + ip := net.ParseIP(strings.TrimSpace(string(body))) + if ip == nil { + checkErrorsMetric.WithLabelValues(u.domain, "invalidip").Inc() + + return nil, errors.Errorf("failed to parse IP: %s", body) + } + + success = true + + checksMetric.WithLabelValues(u.domain).Inc() + + return ip, nil +} + +// Lookup returns the resolved IP from the domain +func (u *Updater) Lookup(ctx context.Context) (net.IP, error) { + success := false + + done := timeOp("Lookup", u.domain) + defer func(ctx context.Context) { + done(ctx, success) + }(ctx) + + ips, err := net.DefaultResolver.LookupIPAddr(ctx, u.domain) + if err != nil { + lookupErrorsMetric.WithLabelValues(u.domain, err.Error()).Inc() + + return nil, errors.Wrap(err, "failed to lookup IP") + } + + if len(ips) == 0 { + lookupErrorsMetric.WithLabelValues(u.domain, "nonefound").Inc() + + return nil, errors.New("DNS lookup returned no IPs") + } + + // if len(ips) > 1 { + // // u.log.Warn().Int("ips_found", len(ips)).Msg("too many IPs found, only one expected! Picking the first") + // } + + success = true + + lookupsMetric.WithLabelValues(u.domain).Inc() + + return ips[0].IP, nil +} + +// Loop - +func (u *Updater) Loop(ctx context.Context, interval time.Duration) error { + tick := time.NewTicker(interval) + + for { + select { + case <-tick.C: + ip, err := u.CheckIP(ctx) + if err != nil { + // u.log.Error().Err(err).Msg("failed to check IP") + continue + } + + dnsIP, err := u.Lookup(ctx) + if err != nil { + // u.log.Error().Err(err).Msg("failed to lookup IP") + continue + } + + if u.ip == nil || !u.ip.Equal(ip) || !dnsIP.Equal(ip) { + _, err = u.Update(ctx) + // if err != nil { + // // u.log.Error().Err(err).Msg("failed to update") + // } + + switch err.(type) { + case ClientError: + tick.Stop() + + return err + case ServerError: + time.Sleep(serverErrorWaitTime) + } + } + case <-ctx.Done(): + tick.Stop() + + return nil + } + } +} + +func parseBody(body []byte) (status string, ip net.IP, err error) { + parts := strings.SplitN(strings.TrimSpace(string(body)), " ", 2) + status = parts[0] + + if len(parts) == 2 { + ip = net.ParseIP(parts[1]) + } + + switch status { + case StatusGood, StatusNoChange: + if len(parts) != 2 { + return "", nil, errors.Errorf("malformed response body %s", body) + } + + return status, ip, nil + case StatusNotFQDN, StatusNoHost, StatusNumHost, StatusAbuse, StatusBadAuth, StatusBadAgent: + return status, nil, ClientError{status} + case StatusDNSErr, Status911, StatusInterval: + return status, nil, ServerError{status} + default: + return status, ip, errors.Errorf("unexpected status from %s", body) + } +} + +func createHTTPClient(url string) *http.Client { + rt := promhttp.InstrumentRoundTripperDuration( + httpClientDurationHist.MustCurryWith(prometheus.Labels{"url": url}), + http.DefaultTransport, + ) + + client := &http.Client{ + Transport: rt, + } + + return client +} diff --git a/metrics.go b/metrics.go new file mode 100644 index 0000000..b1cedf6 --- /dev/null +++ b/metrics.go @@ -0,0 +1,111 @@ +package ipupdater + +import ( + "context" + "fmt" + "runtime" + "strconv" + "time" + + "github.com/hairyhenderson/henet-ipupdater/internal/version" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promauto" + "github.com/weaveworks/common/instrument" +) + +var ( + labelNames = []string{"domain", "status"} + ns = "ipupdater" + + opDurationHistogram = promauto.NewHistogramVec(prometheus.HistogramOpts{ + Namespace: ns, + Name: "op_duration_seconds", + Buckets: prometheus.DefBuckets, + }, []string{"op", "domain", "success"}) + + updatesMetric = promauto.NewCounterVec(prometheus.CounterOpts{ + Namespace: ns, + Name: "updates_total", + Help: "the number of updates completed, labeled by domain and status", + }, labelNames) + updateErrorsMetric = promauto.NewCounterVec(prometheus.CounterOpts{ + Namespace: ns, + Name: "update_errors_total", + Help: "the number of update errors, labeled by domain and status", + }, labelNames) + + checksMetric = promauto.NewCounterVec(prometheus.CounterOpts{ + Namespace: ns, + Name: "checks_total", + Help: "the number of IP checks completed, labeled by domain", + }, []string{"domain"}) + checkErrorsMetric = promauto.NewCounterVec(prometheus.CounterOpts{ + Namespace: ns, + Name: "check_errors_total", + Help: "the number of IP check errors, labeled by domain and reason", + }, []string{"domain", "reason"}) + + lookupsMetric = promauto.NewCounterVec(prometheus.CounterOpts{ + Namespace: ns, + Name: "lookups_total", + Help: "the number of DNS lookups completed, labeled by domain", + }, []string{"domain"}) + lookupErrorsMetric = promauto.NewCounterVec(prometheus.CounterOpts{ + Namespace: ns, + Name: "lookup_errors_total", + Help: "the number of DNS lookup errors, labeled by domain and reason", + }, []string{"domain", "reason"}) + + currentIPMetric = promauto.NewGaugeVec(prometheus.GaugeOpts{ + Namespace: ns, + Name: "current_ip_info", + Help: "the current IP", + }, []string{"domain", "ip"}) + + lastUpdatedMetric = promauto.NewGaugeVec(prometheus.GaugeOpts{ + Namespace: ns, + Name: "last_updated_seconds", + Help: "the time the domain was last updated (with a 'good' status)", + }, []string{"domain"}) + + // intervalMetric = promauto.NewGauge(prometheus.GaugeOpts{ + // Namespace: ns, + // Subsystem: "config", + // Name: "interval_seconds", + // Help: "the configured interval between checks", + // }) + + httpClientDurationHist = promauto.NewHistogramVec(prometheus.HistogramOpts{ + Namespace: "httpclient", + Name: "request_duration_seconds", + Buckets: prometheus.DefBuckets, + }, []string{"url", "code", "method"}) + + buildInfo = promauto.NewGaugeVec(prometheus.GaugeOpts{ + Namespace: ns, + Name: "build_info", + Help: fmt.Sprintf( + "A metric with a constant '1' value labeled by version, revision, branch, and goversion from which %s was built.", + ns, + ), + }, []string{"branch", "goversion", "revision", "version"}) +) + +func init() { + buildInfo.WithLabelValues(version.Branch, runtime.Version(), version.GitCommit, version.Version).Set(1) +} + +func timeOp(op, domain string) func(ctx context.Context, success bool) { + start := time.Now() + + return func(ctx context.Context, success bool) { + duration := time.Since(start).Seconds() + + l := prometheus.Labels{ + "op": op, + "domain": domain, + "success": strconv.FormatBool(success), + } + instrument.ObserveWithExemplar(ctx, opDurationHistogram.With(l), duration) + } +}