initial mvp

.gitignore

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+ibsdns

README.md

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+# ibsdns
+InternetBS DNS Updater
+## Why?
+My buddy Keenan wanted to update home.example.com to point to his IP at home,
+however he has a dynamic IP provided to home and so he needed a way to keep it current.
+He was insistent on using InternetBS as compared to Route53 as he believed it would be less expensive (free basically)
+
+So I made this for him, though I did it in a way where it can be used by anyone with a InternetBS api key,
+and a static host to ssh to and run the update tool from (internetBS limits their IP to a static IP you provide ahead of time)
+
+## HowTo
+On server at home (or where the IP will be dynamicly changing) you need to add `grabDynamicIp.sh` to a cronjob, like once every 5 minutes perhaps
+
+```/bin/bash
+*/5 * * * * /home/jmainguy/grabDynamicIp.sh [email protected] > /home/jmainguy/dnsLog.txt 2>&1
+```
+
+On remotehost add ibsdns binary to `/usr/sbin/ibsdns` and edit `/opt/ibsdns/config.yaml` for your values.
+
+Ensure passwordless ssh is setup from home to remote host, and that the user can read /opt/ibsdns/config.yaml

config.go

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+package main
+
+import (
+	"github.com/ghodss/yaml"
+	"io/ioutil"
+)
+
+func config() (credents Config) {
+	config_file, err := ioutil.ReadFile("/opt/ibsdns/config.yaml")
+	check(err)
+	yaml.Unmarshal(config_file, &credents)
+	return
+}
+
+type Config struct {
+	ApiKey   string `json:"apiKey"`
+	Password string `json:"password"`
+	Domain   string `json:"domain"`
+}

exampleConfig.yaml

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+# Get this from internet.bs
+apiKey: RANDOMCHARACTERS
+# Get this from intertnet.bs
+password: MORERANDOMCHARACHTERS
+# Domain you wish to keep updated to the dynamic ip
+domain: home.jmainguy.com

grabDynamicIp.sh

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+#!/bin/bash
+CONNECTION=$1
+if [[ $CONNECTION == "" ]]; then
+    echo "Usage ./grabDynamicIp.sh user@remoteHost"
+    echo "You must pass connection string for remote box with a static IP where ibsdns is installed"
+    echo "Please setup ssh keys so you can add this to a cronjob"
+    exit 1
+fi
+NEWIP=$(curl -s https://ip.jmainguy.com | awk '{print $4}')
+OLDIP=$(cat ~/lastIP.txt)
+if [[ $NEWIP != $OLDIP ]]; then
+    echo $NEWIP > ~/lastIP.txt
+    ssh $CONNECTION "/usr/sbin/ibsdns --value \"$NEWIP\""
+else
+    echo "No update needed"
+fi

internetbs.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+func updateDns(apiKey, password, fullrecordname, recordtype, newvalue string) (transactid, status, message string) {
+
+	// Test Api
+	Url := "https://api.internet.bs/Domain/DnsRecord/Update"
+
+	param := url.Values{}
+	param.Add("apiKey", apiKey)
+	param.Add("password", password)
+	param.Add("fullrecordname", fullrecordname)
+	param.Add("type", recordtype)
+	param.Add("newvalue", newvalue)
+	param.Add("ResponseFormat", "JSON")
+
+	req, err := http.NewRequest("POST", Url, strings.NewReader(param.Encode()))
+	if err != nil {
+		fmt.Println(err)
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		fmt.Println(err)
+	}
+	defer resp.Body.Close()
+	jsonblob, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		fmt.Println(err)
+	}
+	transactid, status, message = decodeResponse(jsonblob)
+	return
+}
+
+func decodeResponse(jsonblob []byte) (transactid, status, message string) {
+	var response Response
+	json.Unmarshal(jsonblob, &response)
+	transactid = response.Transactid
+	status = response.Status
+	message = response.Message
+
+	return
+}

main.go

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+package main
+
+import (
+	"fmt"
+    "os"
+    "flag"
+)
+
+func check(e error) {
+	if e != nil {
+		fmt.Println(e)
+	}
+}
+
+func main() {
+
+    value := flag.String("value", "", "IP to update domain to, example 192.168.1.1")
+    flag.Parse()
+
+	c := config()
+	recordtype := "A"
+	newvalue := *value
+
+    if newvalue == "" {
+        fmt.Println("You must provide a value for the IP")
+        os.Exit(1)
+    }
+
+	tid, status, message := updateDns(c.ApiKey, c.Password, c.Domain, recordtype, newvalue)
+	if message != "" {
+		fmt.Printf("TransactID: %s, Status: %s, Message: %s\n", tid, status, message)
+	} else {
+		fmt.Printf("TransactID: %s, Status: %s\n", tid, status)
+	}
+
+}

structs.go

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+package main
+
+type Response struct {
+	Transactid string `json:"transactid"`
+	Status     string `json:"status"`
+	Message    string `json:"message"`
+}