get wan ip from router

send mail with gomail
a lot of parameters in the conf file

go.mod

@@ -5,4 +5,6 @@ go 1.12
 require (
 	github.com/sirupsen/logrus v1.4.2
 	github.com/urfave/cli v1.20.0
+	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
+	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
 )

go.sum

@@ -1,22 +1,19 @@
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
-github.com/konsorten/go-windows-terminal-sequences v1.0.2 h1:DB17ag19krx9CFsz4o3enTrPXyIXCl+2iCXH/aMAp9s=
-github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/urfave/cli v1.20.0 h1:fDqGv3UG/4jbVl/QkFwEdddtEDjh/5Ov6X+0B/3bPaw=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190609082536-301114b31cce h1:CQakrGkKbydnUmt7cFIlmQ4lNQiqdTPt6xzXij4nYCc=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc h1:2gGKlE2+asNV9m7xrywl36YYNnBG5ZQ0r/BOOxqPpmk=
-golang.org/x/sys v0.0.0-20190609082536-301114b31cce/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
+gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df h1:n7WqCuqOuCbNr617RXOY0AWRXxgwEyPp2z+p0+hgMuE=
+gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df/go.mod h1:LRQQ+SO6ZHR7tOkpBDuZnXENFzX8qRjMDMyPD6BRkCw=

main.go

@@ -6,18 +6,31 @@ import (
 	"fmt"
 	log "github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
+	"gopkg.in/gomail.v2"
 	"io/ioutil"
 	"net/http"
-	"net/smtp"
 	"os"
 	"path"
+	"regexp"
 )
 
 type Configuration struct {
-	Username string   `json:"name"`
+	Username        string   `json:"name"`
-	Email    string   `json:"email"`
+	Email           string   `json:"email"`
-	GandiKey string   `json:"gandikey"`
+	GandiKey        string   `json:"gandikey"`
-	Domains  []string `json:"domains"`
+	Domains         []string `json:"domains"`
+	RouterLogin     string   `json:"router_login"`
+	RouterPassword  string   `json:"router_password"`
+	RouterStatusUrl string   `json:"router_status_url"`
+	WanIPRegex      string   `json:"wan_ip_regex"`
+	MailSettings    *struct {
+		Sender       string   `json:"sender"`
+		To           []string `json:"to"`
+		SmtpHost     string   `json:"smtp_host"`
+		SmtpLogin    string   `json:"smtp_login"`
+		SmtpPassword string   `json:"smtp_password"`
+		SmtpPort     int      `json:"smtp_port"`
+	} `json:"mail_settings"`
 }
 
 type DnsResponse struct {
@@ -28,22 +41,23 @@ type DnsResponse struct {
 }
 
 var (
-	configPath string
+	configuration *Configuration
+	configPath    string
 )
 
 func main() {
 
 	app := cli.NewApp()
 	app.Name = "dnsupdater"
-	app.Version = "0.0.1"
 	app.Usage = "Automatically update dns"
+	app.Before = before
 	app.Action = start
 	app.Flags = []cli.Flag{
 
 		cli.StringFlag{
 			Name:   "config, C",
 			Usage:  "path to config file",
-			Value:  "/config/conf.json",
+			Value:  "/config",
 			EnvVar: "CONFIG_PATH",
 		},
 	}
@@ -53,26 +67,35 @@ func main() {
 	}
 }
 
-func start(c *cli.Context) {
+func before(c *cli.Context) error {
-	if err := update(c); err != nil {
+	log.SetLevel(log.InfoLevel)
-		log.Errorln(err)
-		SendStatusMail(fmt.Sprintf("Error during update process : %s", err))
-	}
-}
-
-func update(c *cli.Context) error {
-	configPath = c.String("config")
 
+	configPath = path.Join(c.String("config"), "conf.json")
 	if confPathExists, _ := exists(configPath); !confPathExists {
-		configPath = "./data"
+		return fmt.Errorf("config file does not exist : %s", configPath)
 	}
 
-	file, _ := os.Open(path.Join(configPath, "conf.json"))
+	file, _ := os.Open(configPath)
 	defer file.Close()
 	decoder := json.NewDecoder(file)
-	configuration := Configuration{}
+	configuration = &Configuration{}
-	err := decoder.Decode(&configuration)
+	err := decoder.Decode(configuration)
+	if err != nil {
+		return err
+	}
+	return nil
+}
 
+func start(c *cli.Context) error {
+	SendStatusMail("test")
+	if err := update(); err != nil {
+		SendStatusMail(fmt.Sprintf("Error during update process : %s", err))
+		return err
+	}
+	return nil
+}
+
+func update() error {
 	newIp, err := GetOutboundIP()
 	if err != nil {
 		return err
@@ -80,7 +103,7 @@ func update(c *cli.Context) error {
 
 	updatedDomains := ""
 	for _, domain := range configuration.Domains {
-		currentIp, err := GetCurrentIp(configuration, domain)
+		currentIp, err := GetCurrentIp(*configuration, domain)
 		if err != nil {
 			return err
 		}
@@ -89,9 +112,9 @@ func update(c *cli.Context) error {
 			continue
 		}
 
-		fmt.Printf("%s -> Ip has changed %s -> %s\n", domain, currentIp, newIp)
+		log.Infoln("%s -> Ip has changed %s -> %s\n", domain, currentIp, newIp)
 
-		err = SetCurrentIp(newIp, domain, configuration)
+		err = SetCurrentIp(newIp, domain, *configuration)
 		if err != nil {
 			return err
 		}
@@ -108,33 +131,30 @@ Dns updated successfully for domains
 }
 
 func SendStatusMail(messageText string) {
-	// user we are authorizing as
-	from := "laurent@lehouerou.net"
 
-	// use we are sending email to
+	settings := configuration.MailSettings
-	to := "laurent@lehouerou.net"
+	if settings == nil{
+		log.Warnln("no smtp settings defined > status mail not sent")
+		return
+	}
 
-	// server we are authorized to send email through
+	d := gomail.NewDialer(settings.SmtpHost, settings.SmtpPort, settings.SmtpLogin, settings.SmtpPassword)
-	host := "smtp.fastmail.com"
+	s, err := d.Dial()
+	if err != nil {
+		log.Errorln("error while dialing smtp server : %v", err)
+	}
 
-	// Create the authentication for the SendMail()
+	m := gomail.NewMessage()
-	// using PlainText, but other authentication methods are encouraged
+	for _, r := range settings.To {
-	auth := smtp.PlainAuth("", from, "c9bd8fb8l4bhs2f8", host)
+		m.SetHeader("From", settings.Sender)
+		m.SetAddressHeader("To", r, "")
+		m.SetHeader("Subject", "DnsUpdater Status")
+		m.SetBody("text/plain", messageText)
 
-	// NOTE: Using the backtick here ` works like a heredoc, which is why all the
+		if err := gomail.Send(s, m); err != nil {
-	// rest of the lines are forced to the beginning of the line, otherwise the
+			log.Warnln("could not send email to %q: %v", r, err)
-	// formatting is wrong for the RFC 822 style
+		}
-	message := fmt.Sprintf(`To: "Laurent Le Houerou" <laurent@lehouerou.net>
+		m.Reset()
-From: "Laurent Le Houerou" <laurent@lehouerou.net>
-Subject: DnsUpdater Status
-
-%s
-`, messageText)
-
-	if err := smtp.SendMail(host+":587", auth, from, []string{to}, []byte(message)); err != nil {
-		fmt.Println("Error SendMail: ", err)
-	} else {
-		fmt.Println("Email Sent!")
 	}
 }
 
@@ -191,11 +211,17 @@ func SetCurrentIp(newip string, domain string, configuration Configuration) erro
 }
 
 func GetOutboundIP() (string, error) {
-	url := "https://api.ipify.org"
+	url := configuration.RouterStatusUrl
+	if url == "" {
+		url = "http://192.168.1.1/Status_Internet.live.asp"
+	}
 	req, err := http.NewRequest("GET", url, nil)
 	if err != nil {
 		return "", err
 	}
+	if configuration.RouterLogin != "" && configuration.RouterPassword != "" {
+		req.SetBasicAuth(configuration.RouterLogin, configuration.RouterPassword)
+	}
 	res, err := http.DefaultClient.Do(req)
 	if err != nil {
 		return "", err
@@ -205,7 +231,18 @@ func GetOutboundIP() (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return string(body), nil
+
+	log.Debugln(string(body))
+	wanipregex := configuration.WanIPRegex
+	if wanipregex == "" {
+		wanipregex = "wan_ipaddr::([0-9.]*)}"
+	}
+	r := regexp.MustCompile(wanipregex)
+	matches := r.FindStringSubmatch(string(body))
+	if len(matches) < 2 {
+		return "", fmt.Errorf("unable to find WAN IP with regex %s in %s", wanipregex, string(body))
+	}
+	return matches[1], nil
 }
 
 func exists(path string) (bool, error) {