Merge pull request #26 from kerma/master

Support for Cloudflare

README.md

@@ -29,6 +29,7 @@ GoDNS is a dynamic DNS (DDNS) client tool, it is based on my early open source p
 Now I rewrite [DynDNS](https://github.com/TimothyYe/DynDNS) by Golang and call it [GoDNS](https://github.com/TimothyYe/godns).
 
 ## Supported DNS Provider
+* Cloudflare ([https://cloudflare.com](https://cloudflare.com))
 * DNSPod ([https://www.dnspod.cn/](https://www.dnspod.cn/))
 * HE.net (Hurricane Electric) ([https://dns.he.net/](https://dns.he.net/))
 
@@ -95,6 +96,28 @@ Usage of ./godns:
 * Configure the SMTP options if you want, a mail notification will sent to your mailbox once the IP is changed.
 * Save it in the same directory of GoDNS, or use -c=your_conf_path command.
 
+### Config example for Cloudflare
+
+For Cloudflare, you need to provide email & Global API Key as password, and config all the domains & subdomains.
+
+```json
+{
+  "provider": "Cloudflare",
+  "email": "[email protected]"
+  "password": "Global API Key",
+  "domains": [{
+      "domain_name": "example.com",
+      "sub_domains": ["www","test"]
+    },{
+      "domain_name": "example2.com",
+      "sub_domains": ["www","test"]
+    }
+  ],
+  "ip_url": "https://ifconfig.co/ip",
+  "socks5_proxy": ""
+}
+```
+
 ### Config example for DNSPod
 
 For DNSPod, you need to provide email & password,  and config all the domains & subdomains.

handler/cloudflare_handler.go

@@ -0,0 +1,245 @@
+package handler
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"runtime/debug"
+	"time"
+
+	"github.com/TimothyYe/godns"
+	"golang.org/x/net/proxy"
+)
+
+// CloudflareHandler struct definition
+type CloudflareHandler struct {
+	Configuration *godns.Settings
+	API           string
+}
+
+// DNSRecordResponse struct
+type DNSRecordResponse struct {
+	Records []DNSRecord `json:"result"`
+	Success bool        `json:"success"`
+}
+
+// DNSRecordUpdateResponse struct
+type DNSRecordUpdateResponse struct {
+	Record  DNSRecord `json:"result"`
+	Success bool      `json:"success"`
+}
+
+// DNSRecord for Cloudflare API
+type DNSRecord struct {
+	ID      string `json:"id"`
+	IP      string `json:"content"`
+	Name    string `json:"name"`
+	Proxied bool   `json:"proxied"`
+	Type    string `json:"type"`
+	ZoneID  string `json:"zone_id"`
+}
+
+// SetIP updates DNSRecord.IP
+func (r *DNSRecord) SetIP(ip string) {
+	r.IP = ip
+}
+
+// ZoneResponse is a wrapper for Zones
+type ZoneResponse struct {
+	Zones   []Zone `json:"result"`
+	Success bool   `json:"success"`
+}
+
+// Zone object with id and name
+type Zone struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}
+
+// SetConfiguration pass dns settings and store it to handler instance
+func (handler *CloudflareHandler) SetConfiguration(conf *godns.Settings) {
+	handler.Configuration = conf
+	handler.API = "https://api.cloudflare.com/client/v4"
+}
+
+// DomainLoop the main logic loop
+func (handler *CloudflareHandler) DomainLoop(domain *godns.Domain, panicChan chan<- godns.Domain) {
+	defer func() {
+		if err := recover(); err != nil {
+			log.Printf("Recovered in %v: %v\n", err, debug.Stack())
+			panicChan <- *domain
+		}
+	}()
+
+	for {
+		currentIP, err := godns.GetCurrentIP(handler.Configuration)
+		if err != nil {
+			log.Println("Error in GetCurrentIP:", err)
+			continue
+		}
+		log.Println("Current IP is:", currentIP)
+		// TODO: check against locally cached IP, if no change, skip update
+
+		log.Println("Checking IP for domain", domain.DomainName)
+		zoneID := handler.getZone(domain.DomainName)
+		if zoneID != "" {
+			records := handler.getDNSRecords(zoneID)
+
+			// update records
+			for _, rec := range records {
+				if recordTracked(domain, &rec) != true {
+					log.Println("Skiping record:", rec.Name)
+					continue
+				}
+				if rec.IP != currentIP {
+					log.Printf("IP mismatch: Current(%+v) vs Cloudflare(%+v)\r\n", currentIP, rec.IP)
+					handler.updateRecord(rec, currentIP)
+				} else {
+					log.Printf("Record OK: %+v - %+v\r\n", rec.Name, rec.IP)
+				}
+			}
+		} else {
+			log.Println("Failed to find zone for domain:", domain.DomainName)
+		}
+
+		// Interval is 5 minutes
+		log.Printf("Going to sleep, will start next checking in %d minutes...\r\n", godns.INTERVAL)
+		time.Sleep(time.Minute * godns.INTERVAL)
+	}
+}
+
+// Check if record is present in domain conf
+func recordTracked(domain *godns.Domain, record *DNSRecord) bool {
+
+	if record.Name == domain.DomainName {
+		return true
+	}
+
+	for _, subDomain := range domain.SubDomains {
+		sd := subDomain + "." + domain.DomainName
+		if record.Name == sd {
+			return true
+		}
+	}
+
+	return false
+}
+
+// Create a new request with auth in place and optional proxy
+func (handler *CloudflareHandler) newRequest(method, url string, body io.Reader) (*http.Request, *http.Client) {
+	client := &http.Client{}
+
+	if handler.Configuration.Socks5Proxy != "" {
+		log.Println("use socks5 proxy:" + handler.Configuration.Socks5Proxy)
+		dialer, err := proxy.SOCKS5("tcp", handler.Configuration.Socks5Proxy, nil, proxy.Direct)
+		if err != nil {
+			log.Println("can't connect to the proxy:", err)
+		} else {
+			httpTransport := &http.Transport{}
+			client.Transport = httpTransport
+			httpTransport.Dial = dialer.Dial
+		}
+	}
+
+	req, _ := http.NewRequest(method, handler.API+url, body)
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-Auth-Email", handler.Configuration.Email)
+	req.Header.Set("X-Auth-Key", handler.Configuration.Password)
+	return req, client
+}
+
+// Find the correct zone via domain name
+func (handler *CloudflareHandler) getZone(domain string) string {
+
+	var z ZoneResponse
+
+	req, client := handler.newRequest("GET", "/zones", nil)
+	resp, err := client.Do(req)
+	if err != nil {
+		log.Println("Request error:", err.Error())
+		return ""
+	}
+
+	body, _ := ioutil.ReadAll(resp.Body)
+	err = json.Unmarshal(body, &z)
+	if err != nil {
+		log.Printf("Decoder error: %+v\n", err)
+		log.Printf("Response body: %+v\n", string(body))
+		return ""
+	}
+	if z.Success != true {
+		log.Printf("Response failed: %+v\n", string(body))
+		return ""
+	}
+
+	for _, zone := range z.Zones {
+		if zone.Name == domain {
+			return zone.ID
+		}
+	}
+	return ""
+}
+
+// Get all DNS A records for a zone
+func (handler *CloudflareHandler) getDNSRecords(zoneID string) []DNSRecord {
+
+	var empty []DNSRecord
+	var r DNSRecordResponse
+
+	req, client := handler.newRequest("GET", "/zones/"+zoneID+"/dns_records?type=A", nil)
+	resp, err := client.Do(req)
+	if err != nil {
+		log.Println("Request error:", err.Error())
+		return empty
+	}
+
+	body, _ := ioutil.ReadAll(resp.Body)
+	err = json.Unmarshal(body, &r)
+	if err != nil {
+		log.Printf("Decoder error: %+v\n", err)
+		log.Printf("Response body: %+v\n", string(body))
+		return empty
+	}
+	if r.Success != true {
+		body, _ := ioutil.ReadAll(resp.Body)
+		log.Printf("Response failed: %+v\n", string(body))
+		return empty
+
+	}
+	return r.Records
+}
+
+// Update DNS A Record with new IP
+func (handler *CloudflareHandler) updateRecord(record DNSRecord, newIP string) {
+
+	var r DNSRecordUpdateResponse
+	record.SetIP(newIP)
+
+	j, _ := json.Marshal(record)
+	req, client := handler.newRequest("PUT",
+		"/zones/"+record.ZoneID+"/dns_records/"+record.ID,
+		bytes.NewBuffer(j),
+	)
+	resp, err := client.Do(req)
+	if err != nil {
+		log.Println("Request error:", err.Error())
+		return
+	}
+
+	body, _ := ioutil.ReadAll(resp.Body)
+	err = json.Unmarshal(body, &r)
+	if err != nil {
+		log.Printf("Decoder error: %+v\n", err)
+		log.Printf("Response body: %+v\n", string(body))
+		return
+	}
+	if r.Success != true {
+		body, _ := ioutil.ReadAll(resp.Body)
+		log.Printf("Response failed: %+v\n", string(body))
+	} else {
+		log.Printf("Record updated: %+v - %+v", record.Name, record.IP)
+	}
+}