diff --git a/.github/dependabot.yml b/.github/dependabot.yml new file mode 100644 index 0000000..3464e14 --- /dev/null +++ b/.github/dependabot.yml @@ -0,0 +1,8 @@ +version: 2 +updates: + - package-ecosystem: gomod + directory: "/" + schedule: + interval: daily + time: '04:00' + open-pull-requests-limit: 10 diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml new file mode 100644 index 0000000..73766d4 --- /dev/null +++ b/.github/workflows/release.yml @@ -0,0 +1,26 @@ +name: Release +on: + push: + tags: + - '*' + +jobs: + goreleaser: + name: GoReleaser + runs-on: ubuntu-latest + steps: + - name: Checkout + uses: actions/checkout@v2 + with: + fetch-depth: 0 + - name: Setup Go + uses: actions/setup-go@v2 + with: + go-version: 1.14 + - name: Run GoReleaser + uses: goreleaser/goreleaser-action@v2 + with: + version: latest + args: release + env: + GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml new file mode 100644 index 0000000..735ca59 --- /dev/null +++ b/.github/workflows/test.yml @@ -0,0 +1,22 @@ +name: Test +on: + pull_request: + push: + +jobs: + test: + name: Test + strategy: + matrix: + go-version: [1.13, 1.14] + platform: [ubuntu-latest, macos-latest, windows-latest] + runs-on: ${{ matrix.platform }} + steps: + - name: Checkout + uses: actions/checkout@v2 + - name: Setup Go + uses: actions/setup-go@v2 + with: + go-version: ${{ matrix.go-version }} + - name: Test + run: go test ./... diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..1f859f1 --- /dev/null +++ b/.gitignore @@ -0,0 +1,19 @@ +# Binaries for programs and plugins +*.exe +*.exe~ +*.dll +*.so +*.dylib + +# Deploy +bin/ +dist/ + +# Test binary, built with `go test -c` +*.test + +# Local binary +/scaleway-ddns + +# Output of the go coverage tool, specifically when used with LiteIDE +*.out diff --git a/.goreleaser.yml b/.goreleaser.yml new file mode 100644 index 0000000..98a9eff --- /dev/null +++ b/.goreleaser.yml @@ -0,0 +1,34 @@ +before: + hooks: + - go mod tidy +builds: + - main: ./cmd/scaleway-ddns + env: + - CGO_ENABLED=0 + goarch: + - amd64 + goos: + - darwin + - linux + - windows + ldflags: + - -s -w + - -X main.version={{.Version}} + - -X main.commit={{.ShortCommit}} + - -X main.date={{.Date}} +checksum: + name_template: checksums.txt +snapshot: + name_template: "{{.Tag}}-{{.ShortCommit}}" +changelog: + sort: asc + filters: + exclude: + - ^(feat|fix)\(doc\) + - ^(feat|fix)\(test\) + - ^Merge pull request +archives: + - wrap_in_directory: true + files: + - LICENSE + - scaleway-ddns.yml diff --git a/CODEOWNERS b/CODEOWNERS new file mode 100644 index 0000000..d463a98 --- /dev/null +++ b/CODEOWNERS @@ -0,0 +1 @@ +* @aerialls diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..6c9cd8c --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2020 Julien Brochet + +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/README.md b/README.md new file mode 100644 index 0000000..f35bef3 --- /dev/null +++ b/README.md @@ -0,0 +1,46 @@ +# scaleway-ddns + +[![Build status](https://github.com/aerialls/scaleway-ddns/workflows/Test/badge.svg)](https://github.com/aerialls/scaleway-ddns/actions?query=workflow%3ATest) +[![Go report card](https://goreportcard.com/badge/github.com/aerialls/scaleway-ddns)](https://goreportcard.com/report/github.com/aerialls/scaleway-ddns) +![Go version](https://img.shields.io/github/go-mod/go-version/aerialls/scaleway-ddns) + +Dynamic DNS service based on [Scaleway DNS](https://console.scaleway.com/domains/external). + +## Usage + +``` +scaleway-ddns --config /etc/scaleway-ddns/scaleway-ddns.yml +``` + +## Parameters + +* `--config` - Specify the location of the configuration file (**required**) +* `--dry-run` - Do not perform update actions (default `false`) +* `--verbose` - Display debug messages (default `false`) +* `--help` - Display the help message block + +## Configuration + +```yaml +scaleway: + organization_id: __ORGANIZATION_ID__ + access_key: __ACCESS_KEY__ + secret_key: __SECRET_KEY__ + +domain: + name: contoso.com + record: public + ttl: 60 + +interval: 300 + +ipv4: + enabled: true + url: https://api-ipv4.ip.sb/ip + +ipv6: + enabled: true + url: https://api-ipv6.ip.sb/ip +``` + +**Note**: IPv6 is disabled by default. diff --git a/SECURITY.md b/SECURITY.md new file mode 100644 index 0000000..3e84ffe --- /dev/null +++ b/SECURITY.md @@ -0,0 +1,13 @@ +# Security Policy + +## Supported Versions + +The following versions are currently being supported with security updates. + +| Version | Supported | +| ------- | ------------------ | +| 0.0.x | :white_check_mark: | + +## Reporting a Vulnerability + +To report a suspected vulnerability, please contact github@aerialls.io and include the steps to produce the vulnerability. diff --git a/cmd/scaleway-ddns/dns.go b/cmd/scaleway-ddns/dns.go new file mode 100644 index 0000000..b65c2b3 --- /dev/null +++ b/cmd/scaleway-ddns/dns.go @@ -0,0 +1,63 @@ +package main + +import ( + "github.com/aerialls/scaleway-ddns/config" + "github.com/aerialls/scaleway-ddns/ip" + "github.com/aerialls/scaleway-ddns/scaleway" +) + +// UpdateDNSRecordFromCurrentIP updates the DNS record on Scaleway DNS based +// on the current IP for IPv4 or IPv6 +func UpdateDNSRecordFromCurrentIP( + dns *scaleway.DNS, + domain config.DomainConfig, + cfg config.IPConfig, + recordType string, + dryRun bool, +) error { + if !cfg.Enabled { + logger.Debugf("skipping %s update, disabled in the configuration", recordType) + return nil + } + + scalewayIP, err := dns.GetRecord(domain.Name, domain.Record, recordType) + if err != nil { + return err + } + + currentIP, err := ip.GetPublicIP(cfg.URL) + if err != nil { + return err + } + + logger.Debugf("current IP registered in Scaleway is %s", scalewayIP) + logger.Debugf("current public IP is %s", currentIP) + + if scalewayIP == currentIP { + logger.Debug("both IPs are identical, nothing to do") + return nil + } + + logger.Infof( + "updating %s record from %s to %s", recordType, scalewayIP, currentIP, + ) + + if dryRun { + logger.Info("running in dry-run mode, doing nothing") + return nil + } + + err = dns.UpdateRecord( + domain.Name, + domain.Record, + domain.TTL, + currentIP, + recordType, + ) + + if err != nil { + return err + } + + return nil +} diff --git a/cmd/scaleway-ddns/main.go b/cmd/scaleway-ddns/main.go new file mode 100644 index 0000000..029964c --- /dev/null +++ b/cmd/scaleway-ddns/main.go @@ -0,0 +1,107 @@ +package main + +import ( + "fmt" + "os" + "time" + + "github.com/aerialls/scaleway-ddns/config" + "github.com/aerialls/scaleway-ddns/scaleway" + + "github.com/sirupsen/logrus" + "github.com/spf13/cobra" +) + +var ( + cfgFile string + verbose bool + logger *logrus.Logger + dryRun bool +) + +var rootCmd = &cobra.Command{ + Use: "scaleway-ddns", + Short: "Dynamic DNS service based on Scaleway DNS", + Run: func(cmd *cobra.Command, args []string) { + logger.Info("starting dynamic records for Scaleway DNS") + + cfg, err := config.NewConfig(cfgFile) + if err != nil { + logger.Fatal(err) + } + + dns, err := scaleway.NewDNS( + logger, + cfg.ScalewayConfig.OrganizationID, + cfg.ScalewayConfig.AccessKey, + cfg.ScalewayConfig.SecretKey, + ) + + if err != nil { + logger.Fatal(err) + } + + ticker := time.NewTicker(time.Duration(cfg.Interval) * time.Second) + + for { + select { + case <-ticker.C: + logger.Debugf( + "updating A/AAAA records for %s.%s", + cfg.DomainConfig.Record, + cfg.DomainConfig.Name, + ) + + recordTypes := map[string]config.IPConfig{ + "A": cfg.IPv4Config, + "AAAA": cfg.IPv6Config, + } + + for recordType, recordCfg := range recordTypes { + err := UpdateDNSRecordFromCurrentIP( + dns, + cfg.DomainConfig, + recordCfg, + recordType, + dryRun, + ) + + if err != nil { + logger.WithError(err).Errorf( + "unable to update %s record", recordType, + ) + } + } + } + } + }, +} + +func init() { + logger = logrus.New() + + cobra.OnInitialize(initConfig) + + rootCmd.Flags().StringVar(&cfgFile, "config", "", "config file") + rootCmd.Flags().BoolVarP(&verbose, "verbose", "v", false, "enable verbose logging") + rootCmd.Flags().BoolVarP(&dryRun, "dry-run", "d", false, "don't update DNS records") + + rootCmd.MarkFlagRequired("config") +} + +func initConfig() { + level := logrus.InfoLevel + if verbose { + level = logrus.DebugLevel + } + + logger.SetLevel(level) + logger.SetFormatter(&logrus.TextFormatter{}) +} + +func main() { + if err := rootCmd.Execute(); err != nil { + fmt.Println(err) + os.Exit(1) + } +} diff --git a/cmd/scaleway-ddns/version.go b/cmd/scaleway-ddns/version.go new file mode 100644 index 0000000..5d7631b --- /dev/null +++ b/cmd/scaleway-ddns/version.go @@ -0,0 +1,25 @@ +package main + +import ( + "fmt" + + "github.com/spf13/cobra" +) + +var ( + version = "undefined" + commit = "dev" + date = "undefined" +) + +var versionCmd = &cobra.Command{ + Use: "version", + Short: "Prints the version", + Run: func(cmd *cobra.Command, args []string) { + fmt.Println(fmt.Sprintf("scaleway-ddns %s (commit %s, built at %s)", version, commit, date)) + }, +} + +func init() { + rootCmd.AddCommand(versionCmd) +} diff --git a/config/config.go b/config/config.go new file mode 100644 index 0000000..3313b1f --- /dev/null +++ b/config/config.go @@ -0,0 +1,115 @@ +package config + +import ( + "fmt" + "io/ioutil" + + "gopkg.in/yaml.v2" +) + +const ( + IntervalMinValue = 60 +) + +// Config struct for the configuration file +type Config struct { + Interval uint `yaml:"interval"` + IPv4Config IPConfig `yaml:"ipv4"` + IPv6Config IPConfig `yaml:"ipv6"` + ScalewayConfig ScalewayConfig `yaml:"scaleway"` + DomainConfig DomainConfig `yaml:"domain"` +} + +// IPConfig struct for the required configuration for IPv4 or IPv6 +type IPConfig struct { + URL string `yaml:"url"` + Enabled bool `yaml:"enabled"` +} + +// ScalewayConfig struct for the required configuration to use the Scaleway API +type ScalewayConfig struct { + OrganizationID string `yaml:"organization_id"` + AccessKey string `yaml:"access_key"` + SecretKey string `yaml:"secret_key"` +} + +// DomainConfig struct for the domain parameters +type DomainConfig struct { + Name string `yaml:"name"` + Record string `yaml:"record"` + TTL uint32 `yaml:"ttl"` +} + +var ( + // DefaultIPv4Config is the default configuration for IPv4 + DefaultIPv4Config = IPConfig{ + URL: "https://api-ipv4.ip.sb/ip", + Enabled: true, + } + + // DefaultIPv6Config is the default configuration for IPv6 + DefaultIPv6Config = IPConfig{ + URL: "https://api-ipv6.ip.sb/ip", + Enabled: false, + } + + // DefaultScalewayConfig is the default configuration to use the Scaleway API + DefaultScalewayConfig = ScalewayConfig{} + + // DefaultDomainConfig is the default domain configuration for common parameters + DefaultDomainConfig = DomainConfig{ + Record: "ddns", + TTL: 60, + } + + // DefaultConfig is the global default configuration. + DefaultConfig = Config{ + Interval: 300, + DomainConfig: DefaultDomainConfig, + IPv4Config: DefaultIPv4Config, + IPv6Config: DefaultIPv6Config, + ScalewayConfig: DefaultScalewayConfig, + } +) + +// NewConfig returns a new config object if the file exists +func NewConfig(path string) (*Config, error) { + data, err := ioutil.ReadFile(path) + if err != nil { + return nil, fmt.Errorf("unable to load the config from file (%s)", err) + } + + cfg := &Config{} + *cfg = DefaultConfig + + err = yaml.Unmarshal([]byte(data), &cfg) + if err != nil { + return nil, err + } + + err = cfg.validate() + if err != nil { + return nil, err + } + + return cfg, nil +} + +func (c *Config) validate() error { + if c.Interval < IntervalMinValue { + return fmt.Errorf( + "update interval should not be below %ds (currently at %d)", + IntervalMinValue, + c.Interval, + ) + } + + scwCfg := c.ScalewayConfig + if scwCfg.AccessKey == "" || scwCfg.SecretKey == "" || scwCfg.OrganizationID == "" { + return fmt.Errorf( + "scaleway parameters (access_key, secret_key, organization_id) cannot be empty", + ) + } + + return nil +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..04fffec --- /dev/null +++ b/go.mod @@ -0,0 +1,11 @@ +module github.com/aerialls/scaleway-ddns + +go 1.14 + +require ( + github.com/scaleway/scaleway-sdk-go v1.0.0-beta.6 + github.com/sirupsen/logrus v1.6.0 + github.com/spf13/cobra v1.0.0 + github.com/stretchr/testify v1.2.2 + gopkg.in/yaml.v2 v2.3.0 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..1de88f0 --- /dev/null +++ b/go.sum @@ -0,0 +1,145 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod 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v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU= +gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/ip/lookup.go b/ip/lookup.go new file mode 100644 index 0000000..194680f --- /dev/null +++ b/ip/lookup.go @@ -0,0 +1,38 @@ +package ip + +import ( + "errors" + "fmt" + "io/ioutil" + "net" + "net/http" + "strings" +) + +// GetPublicIP returns the current public IP (IPv4 or IPv6 depending of the URL) +func GetPublicIP(url string) (string, error) { + response, err := http.Get(url) + if err != nil { + return "", err + } + + defer response.Body.Close() + + if response.StatusCode != http.StatusOK { + return "", fmt.Errorf("unable to get public IP from endpoint %s", url) + } + + body, err := ioutil.ReadAll(response.Body) + if err != nil { + return "", err + } + + rawIP := strings.TrimSpace(string(body)) + ip := net.ParseIP(rawIP) + + if ip == nil { + return "", errors.New("the response is not a valid IP address") + } + + return ip.String(), nil +} diff --git a/ip/lookup_test.go b/ip/lookup_test.go new file mode 100644 index 0000000..20555c0 --- /dev/null +++ b/ip/lookup_test.go @@ -0,0 +1,32 @@ +package ip + +import ( + "strings" + "testing" + + "github.com/stretchr/testify/assert" +) + +func TestTwoServicesShouldReturnSameIPv4(t *testing.T) { + aIP, err := GetPublicIP("https://api.ipify.org") + assert.Nil(t, err) + + bIP, err := GetPublicIP("https://api-ipv4.ip.sb/ip") + assert.Nil(t, err) + + assert.Equal(t, aIP, bIP) +} + +func TestTwoServicesShouldReturnSameIPv6(t *testing.T) { + aIP, err := GetPublicIP("https://v6.ident.me/") + if err != nil && strings.Contains(err.Error(), "connect: no route to host") { + t.Skip("IPv6 connectivity not available") + } + + assert.Nil(t, err) + + bIP, err := GetPublicIP("https://api-ipv6.ip.sb/ip") + assert.Nil(t, err) + + assert.Equal(t, aIP, bIP) +} diff --git a/scaleway-ddns.yml b/scaleway-ddns.yml new file mode 100644 index 0000000..48318f5 --- /dev/null +++ b/scaleway-ddns.yml @@ -0,0 +1,11 @@ +scaleway: + organization_id: __ORGANIZATION_ID__ + access_key: __ACCESS_KEY__ + secret_key: __SECRET_KEY__ + +domain: + name: contoso.com + record: public + ttl: 60 + +interval: 300 diff --git a/scaleway/dns.go b/scaleway/dns.go new file mode 100644 index 0000000..7f56d50 --- /dev/null +++ b/scaleway/dns.go @@ -0,0 +1,98 @@ +package scaleway + +import ( + domainAPI "github.com/scaleway/scaleway-sdk-go/api/domain/v2alpha2" + "github.com/scaleway/scaleway-sdk-go/scw" + log "github.com/sirupsen/logrus" +) + +// DNS struct to contact Scaleway Domains +type DNS struct { + logger *log.Logger + client *scw.Client +} + +// NewDNS returns a new DNS instance +func NewDNS( + logger *log.Logger, + organizationID string, + accessKey string, + secretKey string, +) (*DNS, error) { + client, err := scw.NewClient( + scw.WithDefaultOrganizationID(organizationID), + scw.WithAuth(accessKey, secretKey), + ) + + if err != nil { + return nil, err + } + + return &DNS{ + logger: logger, + client: client, + }, nil +} + +// UpdateRecord updates a DNS record from a specific domain +func (d *DNS) UpdateRecord(domain string, name string, ttl uint32, data string, recordType string) error { + api := domainAPI.NewAPI(d.client) + _, err := api.UpdateDNSZoneRecords(&domainAPI.UpdateDNSZoneRecordsRequest{ + DNSZone: domain, + Changes: []*domainAPI.RecordChange{ + { + Set: &domainAPI.RecordChangeSet{ + Name: name, + Type: domainAPI.RecordTypeA, + Records: []*domainAPI.Record{ + { + Name: name, + Data: data, + Type: d.getRecordTypeFromString(recordType), + TTL: ttl, + }, + }, + }, + }, + }, + ReturnAllRecords: scw.BoolPtr(false), + }) + + if err != nil { + return err + } + + return nil +} + +// GetRecord returns the value from a DNS record +func (d *DNS) GetRecord(domain string, name string, recordType string) (string, error) { + api := domainAPI.NewAPI(d.client) + records, err := api.ListDNSZoneRecords(&domainAPI.ListDNSZoneRecordsRequest{ + DNSZone: domain, + Name: name, + Type: d.getRecordTypeFromString(recordType), + }) + + if err != nil { + return "", err + } + + if records.TotalCount != 1 { + return "", nil + } + + return records.Records[0].Data, nil +} + +func (d *DNS) getRecordTypeFromString(recordType string) domainAPI.RecordType { + if recordType == "A" { + return domainAPI.RecordTypeA + } + + if recordType == "AAAA" { + return domainAPI.RecordTypeAAAA + } + + return domainAPI.RecordTypeUnknown +}