initial commit

.gitignore

@@ -11,5 +11,14 @@
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
 
+# dont want to share go.sum
+go.sum
+
 # Dependency directories (remove the comment below to include it)
 # vendor/
+
+# IntelliJ IDEA
+.idea
+
+# skip the database folder
+database

.travis.yml

@@ -0,0 +1,20 @@
+dist: bionic
+
+language: go
+
+env: GO111MODULE=on
+
+go:
+    - 1.13.x
+    - 1.14.x
+
+git:
+    depth: 1
+
+script:
+    - go test -v ./...
+
+notifications:
+    email:
+        on_success: change
+        on_failure: always

LICENSE

@@ -1,6 +1,7 @@
 MIT License
 
-Copyright (c) 2020 benjaminbear
+Copyright (c) 2020 Benjamin Bärthlein
+Copyright (c) 2016 David Prandzioch
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

deployment/Dockerfile

@@ -0,0 +1,26 @@
+FROM golang:latest as builder
+
+ENV GO111MODULE=on
+ENV GOPATH=/root/go
+RUN mkdir -p /root/go/src
+COPY dyndns /root/go/src/dyndns
+RUN cd /root/go/src/dyndns && go mod download && GOOS=linux GOARCH=amd64 go build -o /root/go/bin/dyndns && go test -v
+
+FROM debian:buster-slim
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
+	apt-get install -q -y bind9 dnsutils curl && \
+	apt-get clean
+
+RUN chmod 770 /var/cache/bind
+COPY deployment/setup.sh /root/setup.sh
+RUN chmod +x /root/setup.sh
+COPY deployment/named.conf.options /etc/bind/named.conf.options
+
+WORKDIR /root
+COPY --from=builder /root/go/bin/dyndns /root/dyndns
+COPY dyndns/views /root/views
+COPY dyndns/static /root/static
+
+EXPOSE 53 8080
+CMD ["sh", "-c", "/root/setup.sh ; service bind9 start ; /root/dyndns"]

deployment/docker-compose.yml

@@ -0,0 +1,17 @@
+version: '3'
+services:
+  ddns:
+    image: bbaerthlein/docker-ddns-server:latest
+    restart: always
+    environment:
+      DDNS_ADMIN_LOGIN: 'admin:$$3$$abcdefg'
+      DDNS_DOMAIN: 'dyndns.example.com'
+      DDNS_PARENT_NS: 'ns.example.com'
+      DDNS_DEFAULT_TTL: '3600'
+    ports:
+      - "53:53"
+      - "53:53/udp"
+      - "8080:8080"
+    volumes:
+       - ./bind-data:/var/cache/bind
+       - ./database:/root/dyndns/database

deployment/envfile

@@ -0,0 +1,4 @@
+DDNS_ADMIN_LOGIN=admin:$$3$$abcdefg
+DDNS_DOMAIN=dyndns.example.com
+DDNS_PARENT_NS=ns.example.com
+DDNS_DEFAULT_TTL=3600

deployment/named.conf.options

@@ -0,0 +1,8 @@
+options {
+        directory "/var/cache/bind";
+        dnssec-validation auto;
+        recursion no;
+        allow-transfer { none; };
+        auth-nxdomain no;
+        listen-on-v6 { any; };
+};

deployment/setup.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+[ -z "$DDNS_ADMIN_LOGIN" ] && echo "DDNS_ADMIN_LOGIN not set" && exit 1;
+[ -z "$DDNS_DOMAIN" ] && echo "DDNS_DOMAIN not set" && exit 1;
+[ -z "$DDNS_PARENT_NS" ] && echo "DDNS_PARENT_NS not set" && exit 1;
+[ -z "$DDNS_DEFAULT_TTL" ] && echo "DDNS_DEFAULT_TTL not set" && exit 1;
+
+DDNS_IP=$(curl icanhazip.com)
+
+if ! grep 'zone "'$DDNS_DOMAIN'"' /etc/bind/named.conf > /dev/null
+then
+	echo "creating zone...";
+	cat >> /etc/bind/named.conf <<EOF
+zone "$DDNS_DOMAIN" {
+	type master;
+	file "$DDNS_DOMAIN.zone";
+	allow-query { any; };
+	allow-transfer { none; };
+	allow-update { localhost; };
+};
+EOF
+fi
+
+if [ ! -f /var/cache/bind/$DDNS_DOMAIN.zone ]
+then
+	echo "creating zone file..."
+	cat > /var/cache/bind/$DDNS_DOMAIN.zone <<EOF
+\$ORIGIN .
+\$TTL 86400	; 1 day
+$DDNS_DOMAIN		IN SOA	${DDNS_PARENT_NS}. root.${DDNS_DOMAIN}. (
+				74         ; serial
+				3600       ; refresh (1 hour)
+				900        ; retry (15 minutes)
+				604800     ; expire (1 week)
+				86400      ; minimum (1 day)
+				)
+			NS	${DDNS_PARENT_NS}.
+			A	${DDNS_IP}
+\$ORIGIN ${DDNS_DOMAIN}.
+\$TTL ${DDNS_DEFAULT_TTL}
+EOF
+fi
+
+# If /var/cache/bind is a volume, permissions are probably not ok
+chown root:bind /var/cache/bind
+chown bind:bind /var/cache/bind/*
+chmod 770 /var/cache/bind
+chmod 644 /var/cache/bind/*

dyndns/go.mod

@@ -0,0 +1,15 @@
+module github.com/benjaminbear/docker-ddns-server/dyndns
+
+go 1.14
+
+require (
+	github.com/foolin/goview v0.3.0
+	github.com/go-playground/validator/v10 v10.2.0
+	github.com/jinzhu/gorm v1.9.12
+	github.com/labstack/echo/v4 v4.1.15
+	github.com/labstack/gommon v0.3.0
+	github.com/tg123/go-htpasswd v1.0.0
+	golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59 // indirect
+	golang.org/x/net v0.0.0-20200324143707-d3edc9973b7e // indirect
+	golang.org/x/sys v0.0.0-20200327173247-9dae0f8f5775 // indirect
+)

dyndns/handler/handler.go

@@ -0,0 +1,116 @@
+package handler
+
+import (
+	"fmt"
+	"github.com/benjaminbear/docker-ddns-server/dyndns/model"
+	"github.com/go-playground/validator/v10"
+	"github.com/jinzhu/gorm"
+	"github.com/labstack/echo/v4"
+	"github.com/tg123/go-htpasswd"
+	"os"
+	"strings"
+)
+
+type Handler struct {
+	DB        *gorm.DB
+	AuthHost  *model.Host
+	AuthAdmin bool
+	Config    Envs
+}
+
+type Envs struct {
+	AdminLogin string
+	Domain     string
+}
+
+type CustomValidator struct {
+	Validator *validator.Validate
+}
+
+func (cv *CustomValidator) Validate(i interface{}) error {
+	return cv.Validator.Struct(i)
+}
+
+type Error struct {
+	Message string `json:"message"`
+}
+
+func (h *Handler) Authenticate(username, password string, c echo.Context) (bool, error) {
+	h.AuthHost = nil
+	h.AuthAdmin = false
+
+	ok, err := h.authByEnv(username, password)
+	if err != nil {
+		fmt.Println("Error:", err)
+		return false, nil
+	}
+
+	if ok {
+		h.AuthAdmin = true
+		return true, nil
+	}
+
+	host := &model.Host{}
+	if err := h.DB.Where(&model.Host{UserName: username, Password: password}).First(host).Error; err != nil {
+		fmt.Println("Error:", err)
+		return false, nil
+	}
+
+	h.AuthHost = host
+
+	return true, nil
+}
+
+func (h *Handler) authByEnv(username, password string) (bool, error) {
+	hashReader := strings.NewReader(h.Config.AdminLogin)
+
+	pw, err := htpasswd.NewFromReader(hashReader, htpasswd.DefaultSystems, nil)
+	if err != nil {
+		return false, err
+	}
+
+	if ok := pw.Match(username, password); ok {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func (h *Handler) ParseEnvs() error {
+	h.Config = Envs{}
+	h.Config.AdminLogin = os.Getenv("DDNS_ADMIN_LOGIN")
+	if h.Config.AdminLogin == "" {
+		return fmt.Errorf("environment variable DDNS_ADMIN_LOGIN has to be set")
+	}
+
+	h.Config.Domain = os.Getenv("DDNS_DOMAIN")
+	if h.Config.Domain == "" {
+		return fmt.Errorf("environment variable DDNS_DOMAIN has to be set")
+	}
+
+	return nil
+}
+
+func (h *Handler) InitDB() (err error) {
+	if _, err := os.Stat("database"); os.IsNotExist(err) {
+		err = os.MkdirAll("database", os.ModePerm)
+		if err != nil {
+			return err
+		}
+	}
+
+	h.DB, err = gorm.Open("sqlite3", "database/ddns.db")
+	if err != nil {
+		return err
+	}
+
+	if !h.DB.HasTable(&model.Host{}) {
+		h.DB.CreateTable(&model.Host{})
+	}
+
+	if !h.DB.HasTable(&model.Log{}) {
+		h.DB.CreateTable(&model.Log{})
+	}
+
+	return nil
+}

dyndns/handler/host.go

@@ -0,0 +1,258 @@
+package handler
+
+import (
+	"fmt"
+	"github.com/benjaminbear/docker-ddns-server/dyndns/model"
+	"github.com/jinzhu/gorm"
+	"github.com/labstack/echo/v4"
+	"net"
+	"net/http"
+	"strconv"
+	"time"
+)
+
+func (h *Handler) GetHost(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	host := &model.Host{}
+	if err = h.DB.First(host, id).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	// Display site
+	return c.JSON(http.StatusOK, id)
+}
+
+func (h *Handler) ListHosts(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	hosts := new([]model.Host)
+	if err = h.DB.Find(hosts).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	return c.Render(http.StatusOK, "listhosts", echo.Map{
+		"hosts":  hosts,
+		"config": h.Config,
+	})
+}
+
+func (h *Handler) AddHost(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	return c.Render(http.StatusOK, "edithost", echo.Map{
+		"addEdit": "add",
+		"config":  h.Config,
+	})
+}
+
+func (h *Handler) EditHost(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	host := &model.Host{}
+	if err = h.DB.First(host, id).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	return c.Render(http.StatusOK, "edithost", echo.Map{
+		"host":    host,
+		"addEdit": "edit",
+		"config":  h.Config,
+	})
+}
+
+func (h *Handler) CreateHost(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	host := &model.Host{}
+	if err = c.Bind(host); err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	if err = c.Validate(host); err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	if err = h.DB.Create(host).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	// If a ip is set create dns entry
+	if host.Ip != "" {
+		ipType := getIPType(host.Ip)
+		if ipType == "" {
+			return c.JSON(http.StatusBadRequest, &Error{fmt.Sprintf("ip %s is not a valid ip", host.Ip)})
+		}
+
+		if err = h.updateRecord(host.Hostname, host.Ip, ipType, host.Ttl); err != nil {
+			return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+		}
+	}
+
+	return c.JSON(http.StatusOK, host)
+}
+
+func (h *Handler) UpdateHost(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	hostUpdate := &model.Host{}
+	if err = c.Bind(hostUpdate); err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	host := &model.Host{}
+	if err = h.DB.First(host, id).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	forceRecordUpdate := host.UpdateHost(hostUpdate)
+	if err = c.Validate(host); err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	if err = h.DB.Save(host).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	// If ip or ttl changed update dns entry
+	if forceRecordUpdate {
+		ipType := getIPType(host.Ip)
+		if ipType == "" {
+			return c.JSON(http.StatusBadRequest, &Error{fmt.Sprintf("ip %s is not a valid ip", host.Ip)})
+		}
+
+		if err = h.updateRecord(host.Hostname, host.Ip, ipType, host.Ttl); err != nil {
+			return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+		}
+	}
+
+	return c.JSON(http.StatusOK, host)
+}
+
+func (h *Handler) DeleteHost(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	host := &model.Host{}
+	if err = h.DB.First(host, id).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	err = h.DB.Transaction(func(tx *gorm.DB) error {
+		if err = tx.Unscoped().Delete(host).Error; err != nil {
+			return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+		}
+
+		if err = tx.Where(&model.Log{HostID: uint(id)}).Delete(&model.Log{}).Error; err != nil {
+			return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+		}
+
+		return nil
+	})
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	if err = h.deleteRecord(host.Hostname); err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	return c.JSON(http.StatusOK, id)
+}
+
+func (h *Handler) UpdateIP(c echo.Context) (err error) {
+	if h.AuthHost == nil {
+		return c.String(http.StatusBadRequest, "badauth\n")
+	}
+
+	log := &model.Log{Status: false, Host: *h.AuthHost, TimeStamp: time.Now(), UserAgent: shrinkUserAgent(c.Request().UserAgent())}
+	log.SentIP = c.QueryParam(("myip"))
+
+	// Get caller IP
+	log.CallerIP, err = getCallerIP(c.Request())
+	if log.CallerIP == "" {
+		log.CallerIP, _, err = net.SplitHostPort(c.Request().RemoteAddr)
+		if err != nil {
+			if err = h.CreateLogEntry(log); err != nil {
+				fmt.Println(err)
+			}
+
+			return c.String(http.StatusBadRequest, "badrequest\n")
+		}
+	}
+
+	// Validate hostname
+	hostname := c.QueryParam("hostname")
+	if hostname == "" || hostname != h.AuthHost.Hostname+"."+h.Config.Domain {
+		if err = h.CreateLogEntry(log); err != nil {
+			fmt.Println(err)
+		}
+
+		return c.String(http.StatusBadRequest, "notfqdn\n")
+	}
+
+	// Get IP type
+	ipType := getIPType(log.SentIP)
+	if ipType == "" {
+		log.SentIP = log.CallerIP
+		ipType = getIPType(log.SentIP)
+		if ipType == "" {
+			if err = h.CreateLogEntry(log); err != nil {
+				fmt.Println(err)
+			}
+
+			return c.String(http.StatusBadRequest, "badrequest\n")
+		}
+	}
+
+	// add/update DNS record
+	if err = h.updateRecord(log.Host.Hostname, log.SentIP, ipType, log.Host.Ttl); err != nil {
+		if err = h.CreateLogEntry(log); err != nil {
+			fmt.Println(err)
+		}
+
+		return c.String(http.StatusBadRequest, "dnserr\n")
+	}
+
+	log.Host.Ip = log.SentIP
+	log.Host.LastUpdate = log.TimeStamp
+	log.Status = true
+	if err = h.CreateLogEntry(log); err != nil {
+		fmt.Println(err)
+	}
+
+	return c.String(http.StatusOK, "good\n")
+}

dyndns/handler/log.go

@@ -0,0 +1,53 @@
+package handler
+
+import (
+	"github.com/benjaminbear/docker-ddns-server/dyndns/model"
+	"github.com/labstack/echo/v4"
+	"net/http"
+	"strconv"
+)
+
+func (h *Handler) CreateLogEntry(log *model.Log) (err error) {
+	if err = h.DB.Create(log).Error; err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (h *Handler) ShowLogs(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	logs := new([]model.Log)
+	if err = h.DB.Preload("Host").Limit(30).Find(logs).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	return c.Render(http.StatusOK, "listlogs", echo.Map{
+		"logs":   logs,
+		"config": h.Config,
+	})
+}
+
+func (h *Handler) ShowHostLogs(c echo.Context) (err error) {
+	if !h.AuthAdmin {
+		return c.JSON(http.StatusUnauthorized, &Error{"You are not allow to view that content"})
+	}
+
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	logs := new([]model.Log)
+	if err = h.DB.Preload("Host").Where(&model.Log{HostID: uint(id)}).Limit(30).Find(logs).Error; err != nil {
+		return c.JSON(http.StatusBadRequest, &Error{err.Error()})
+	}
+
+	return c.Render(http.StatusOK, "listlogs", echo.Map{
+		"logs":   logs,
+		"config": h.Config,
+	})
+}

dyndns/handler/update.go

@@ -0,0 +1,181 @@
+package handler
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"github.com/benjaminbear/docker-ddns-server/dyndns/ipparser"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func (h *Handler) updateRecord(hostname string, ipAddr string, addrType string, ttl int) error {
+	fmt.Printf("%s record update request: %s -> %s\n", addrType, hostname, ipAddr)
+
+	f, err := ioutil.TempFile(os.TempDir(), "dyndns")
+	if err != nil {
+		return err
+	}
+
+	defer os.Remove(f.Name())
+	w := bufio.NewWriter(f)
+
+	w.WriteString(fmt.Sprintf("server %s\n", "localhost"))
+	w.WriteString(fmt.Sprintf("zone %s\n", h.Config.Domain))
+	w.WriteString(fmt.Sprintf("update delete %s.%s %s\n", hostname, h.Config.Domain, addrType))
+	w.WriteString(fmt.Sprintf("update add %s.%s %v %s %s\n", hostname, h.Config.Domain, ttl, addrType, ipAddr))
+	w.WriteString("send\n")
+
+	w.Flush()
+	f.Close()
+
+	cmd := exec.Command("/usr/bin/nsupdate", f.Name())
+	var out bytes.Buffer
+	var stderr bytes.Buffer
+	cmd.Stdout = &out
+	cmd.Stderr = &stderr
+	err = cmd.Run()
+	if err != nil {
+		return fmt.Errorf("%v: %v", err, stderr.String())
+	}
+
+	if out.String() != "" {
+		return fmt.Errorf(out.String())
+	}
+
+	return nil
+}
+
+func (h *Handler) deleteRecord(hostname string) error {
+	fmt.Printf("record delete request: %s\n", hostname)
+
+	f, err := ioutil.TempFile(os.TempDir(), "dyndns")
+	if err != nil {
+		return err
+	}
+
+	defer os.Remove(f.Name())
+	w := bufio.NewWriter(f)
+
+	w.WriteString(fmt.Sprintf("server %s\n", "localhost"))
+	w.WriteString(fmt.Sprintf("zone %s\n", h.Config.Domain))
+	w.WriteString(fmt.Sprintf("update delete %s.%s\n", hostname, h.Config.Domain))
+	w.WriteString("send\n")
+
+	w.Flush()
+	f.Close()
+
+	cmd := exec.Command("/usr/bin/nsupdate", f.Name())
+	var out bytes.Buffer
+	var stderr bytes.Buffer
+	cmd.Stdout = &out
+	cmd.Stderr = &stderr
+	err = cmd.Run()
+	if err != nil {
+		return fmt.Errorf("%v: %v", err, stderr.String())
+	}
+
+	if out.String() != "" {
+		return fmt.Errorf(out.String())
+	}
+
+	return nil
+}
+
+func getIPType(ipAddr string) string {
+	if ipparser.ValidIP4(ipAddr) {
+		return "A"
+	} else if ipparser.ValidIP6(ipAddr) {
+		return "AAAA"
+	} else {
+		return ""
+	}
+}
+
+func getCallerIP(r *http.Request) (string, error) {
+	fmt.Println("request", r.Header)
+	for _, h := range []string{"X-Real-Ip", "X-Forwarded-For"} {
+		addresses := strings.Split(r.Header.Get(h), ",")
+		// march from right to left until we get a public address
+		// that will be the address right before our proxy.
+		for i := len(addresses) - 1; i >= 0; i-- {
+			ip := strings.TrimSpace(addresses[i])
+			// header can contain spaces too, strip those out.
+			realIP := net.ParseIP(ip)
+			if !realIP.IsGlobalUnicast() || isPrivateSubnet(realIP) {
+				// bad address, go to next
+				continue
+			}
+			return ip, nil
+		}
+	}
+	return "", errors.New("no match")
+}
+
+//ipRange - a structure that holds the start and end of a range of ip addresses
+type ipRange struct {
+	start net.IP
+	end   net.IP
+}
+
+// inRange - check to see if a given ip address is within a range given
+func inRange(r ipRange, ipAddress net.IP) bool {
+	// strcmp type byte comparison
+	if bytes.Compare(ipAddress, r.start) >= 0 && bytes.Compare(ipAddress, r.end) < 0 {
+		return true
+	}
+	return false
+}
+
+var privateRanges = []ipRange{
+	ipRange{
+		start: net.ParseIP("10.0.0.0"),
+		end:   net.ParseIP("10.255.255.255"),
+	},
+	ipRange{
+		start: net.ParseIP("100.64.0.0"),
+		end:   net.ParseIP("100.127.255.255"),
+	},
+	ipRange{
+		start: net.ParseIP("172.16.0.0"),
+		end:   net.ParseIP("172.31.255.255"),
+	},
+	ipRange{
+		start: net.ParseIP("192.0.0.0"),
+		end:   net.ParseIP("192.0.0.255"),
+	},
+	ipRange{
+		start: net.ParseIP("192.168.0.0"),
+		end:   net.ParseIP("192.168.255.255"),
+	},
+	ipRange{
+		start: net.ParseIP("198.18.0.0"),
+		end:   net.ParseIP("198.19.255.255"),
+	},
+}
+
+// isPrivateSubnet - check to see if this ip is in a private subnet
+func isPrivateSubnet(ipAddress net.IP) bool {
+	// my use case is only concerned with ipv4 atm
+	if ipCheck := ipAddress.To4(); ipCheck != nil {
+		// iterate over all our ranges
+		for _, r := range privateRanges {
+			// check if this ip is in a private range
+			if inRange(r, ipAddress) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func shrinkUserAgent(agent string) string {
+	agentParts := strings.Split(agent, " ")
+
+	return agentParts[0]
+}

dyndns/ipparser/ipparser.go

@@ -0,0 +1,23 @@
+package ipparser
+
+import (
+	"net"
+)
+
+func ValidIP4(ipAddress string) bool {
+	testInput := net.ParseIP(ipAddress)
+	if testInput == nil {
+		return false
+	}
+
+	return (testInput.To4() != nil)
+}
+
+func ValidIP6(ip6Address string) bool {
+	testInputIP6 := net.ParseIP(ip6Address)
+	if testInputIP6 == nil {
+		return false
+	}
+
+	return (testInputIP6.To16() != nil)
+}

dyndns/ipparser/ipparser_test.go

@@ -0,0 +1,29 @@
+package ipparser
+
+import (
+	"testing"
+)
+
+func TestValidIP4ToReturnTrueOnValidAddress(t *testing.T) {
+	result := ValidIP4("1.2.3.4")
+
+	if result != true {
+		t.Fatalf("Expected ValidIP(1.2.3.4) to be true but got false")
+	}
+}
+
+func TestValidIP4ToReturnFalseOnInvalidAddress(t *testing.T) {
+	result := ValidIP4("abcd")
+
+	if result == true {
+		t.Fatalf("Expected ValidIP(abcd) to be false but got true")
+	}
+}
+
+func TestValidIP4ToReturnFalseOnEmptyAddress(t *testing.T) {
+	result := ValidIP4("")
+
+	if result == true {
+		t.Fatalf("Expected ValidIP() to be false but got true")
+	}
+}

dyndns/main.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/benjaminbear/docker-ddns-server/dyndns/handler"
+	"github.com/foolin/goview/supports/echoview-v4"
+	"github.com/go-playground/validator/v10"
+
+	_ "github.com/jinzhu/gorm/dialects/sqlite"
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+	"github.com/labstack/gommon/log"
+)
+
+func main() {
+	e := echo.New()
+
+	e.Logger.SetLevel(log.ERROR)
+
+	e.Use(middleware.Logger())
+
+	// Set Renderer
+	e.Renderer = echoview.Default()
+
+	// Set Validator
+	e.Validator = &handler.CustomValidator{Validator: validator.New()}
+
+	// Set Statics
+	e.Static("/static", "static")
+
+	// Initialize handler
+	h := &handler.Handler{}
+
+	// Database connection
+	if err := h.InitDB(); err != nil {
+		e.Logger.Fatal(err)
+	}
+	defer h.DB.Close()
+
+	if err := h.ParseEnvs(); err != nil {
+		e.Logger.Fatal(err)
+	}
+
+	e.Use(middleware.BasicAuth(h.Authenticate))
+
+	// UI Routes
+	e.GET("/", func(c echo.Context) error {
+		//render with master
+		return c.Render(http.StatusOK, "index", nil)
+	})
+
+	e.GET("/hosts/add", h.AddHost)
+	e.GET("/hosts/edit/:id", h.EditHost)
+	e.GET("/hosts", h.ListHosts)
+	e.GET("/logs", h.ShowLogs)
+	e.GET("/logs/host/:id", h.ShowHostLogs)
+
+	// Rest Routes
+	e.POST("/hosts/add", h.CreateHost)
+	e.POST("/hosts/edit/:id", h.UpdateHost)
+	e.GET("/hosts/delete/:id", h.DeleteHost)
+	e.GET("/update", h.UpdateIP)
+
+	// Start server
+	e.Logger.Fatal(e.Start(":8080"))
+}

dyndns/model/host.go

@@ -0,0 +1,32 @@
+package model
+
+import (
+	"time"
+
+	"github.com/jinzhu/gorm"
+)
+
+type Host struct {
+	gorm.Model
+	Hostname   string    `gorm:"unique;not null" form:"hostname" validate:"required,hostname"`
+	Ip         string    `form:"ip" validate:"omitempty,ipv4"`
+	Ttl        int       `form:"ttl" validate:"required,min=20,max=86400"`
+	LastUpdate time.Time `form:"lastupdate"`
+	UserName   string    `gorm:"unique" form:"username" validate:"min=8"`
+	Password   string    `form:"password" validate:"min=8"`
+}
+
+func (h *Host) UpdateHost(updateHost *Host) (updateRecord bool) {
+	updateRecord = false
+	if h.Ip != updateHost.Ip || h.Ttl != updateHost.Ttl {
+		updateRecord = true
+		h.LastUpdate = time.Now()
+	}
+
+	h.Ip = updateHost.Ip
+	h.Ttl = updateHost.Ttl
+	h.UserName = updateHost.UserName
+	h.Password = updateHost.Password
+
+	return
+}

dyndns/model/log.go

@@ -0,0 +1,18 @@
+package model
+
+import (
+	"time"
+
+	"github.com/jinzhu/gorm"
+)
+
+type Log struct {
+	gorm.Model
+	Status    bool
+	Host      Host
+	HostID    uint
+	SentIP    string
+	CallerIP  string
+	TimeStamp time.Time
+	UserAgent string
+}

dyndns/static/css/bootstrap-reboot.css

@@ -0,0 +1,331 @@
+/*!
+ * Bootstrap Reboot v4.3.1 (https://getbootstrap.com/)
+ * Copyright 2011-2019 The Bootstrap Authors
+ * Copyright 2011-2019 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
+ */
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+}
+
+html {
+  font-family: sans-serif;
+  line-height: 1.15;
+  -webkit-text-size-adjust: 100%;
+  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
+}
+
+article, aside, figcaption, figure, footer, header, hgroup, main, nav, section {
+  display: block;
+}
+
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+  font-size: 1rem;
+  font-weight: 400;
+  line-height: 1.5;
+  color: #212529;
+  text-align: left;
+  background-color: #fff;
+}
+
+[tabindex="-1"]:focus {
+  outline: 0 !important;
+}
+
+hr {
+  box-sizing: content-box;
+  height: 0;
+  overflow: visible;
+}
+
+h1, h2, h3, h4, h5, h6 {
+  margin-top: 0;
+  margin-bottom: 0.5rem;
+}
+
+p {
+  margin-top: 0;
+  margin-bottom: 1rem;
+}
+
+abbr[title],
+abbr[data-original-title] {
+  text-decoration: underline;
+  -webkit-text-decoration: underline dotted;
+  text-decoration: underline dotted;
+  cursor: help;
+  border-bottom: 0;
+  -webkit-text-decoration-skip-ink: none;
+  text-decoration-skip-ink: none;
+}
+
+address {
+  margin-bottom: 1rem;
+  font-style: normal;
+  line-height: inherit;
+}
+
+ol,
+ul,
+dl {
+  margin-top: 0;
+  margin-bottom: 1rem;
+}
+
+ol ol,
+ul ul,
+ol ul,
+ul ol {
+  margin-bottom: 0;
+}
+
+dt {
+  font-weight: 700;
+}
+
+dd {
+  margin-bottom: .5rem;
+  margin-left: 0;
+}
+
+blockquote {
+  margin: 0 0 1rem;
+}
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+small {
+  font-size: 80%;
+}
+
+sub,
+sup {
+  position: relative;
+  font-size: 75%;
+  line-height: 0;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -.25em;
+}
+
+sup {
+  top: -.5em;
+}
+
+a {
+  color: #007bff;
+  text-decoration: none;
+  background-color: transparent;
+}
+
+a:hover {
+  color: #0056b3;
+  text-decoration: underline;
+}
+
+a:not([href]):not([tabindex]) {
+  color: inherit;
+  text-decoration: none;
+}
+
+a:not([href]):not([tabindex]):hover, a:not([href]):not([tabindex]):focus {
+  color: inherit;
+  text-decoration: none;
+}
+
+a:not([href]):not([tabindex]):focus {
+  outline: 0;
+}
+
+pre,
+code,
+kbd,
+samp {
+  font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+  font-size: 1em;
+}
+
+pre {
+  margin-top: 0;
+  margin-bottom: 1rem;
+  overflow: auto;
+}
+
+figure {
+  margin: 0 0 1rem;
+}
+
+img {
+  vertical-align: middle;
+  border-style: none;
+}
+
+svg {
+  overflow: hidden;
+  vertical-align: middle;
+}
+
+table {
+  border-collapse: collapse;
+}
+
+caption {
+  padding-top: 0.75rem;
+  padding-bottom: 0.75rem;
+  color: #6c757d;
+  text-align: left;
+  caption-side: bottom;
+}
+
+th {
+  text-align: inherit;
+}
+
+label {
+  display: inline-block;
+  margin-bottom: 0.5rem;
+}
+
+button {
+  border-radius: 0;
+}
+
+button:focus {
+  outline: 1px dotted;
+  outline: 5px auto -webkit-focus-ring-color;
+}
+
+input,
+button,
+select,
+optgroup,
+textarea {
+  margin: 0;
+  font-family: inherit;
+  font-size: inherit;
+  line-height: inherit;
+}
+
+button,
+input {
+  overflow: visible;
+}
+
+button,
+select {
+  text-transform: none;
+}
+
+select {
+  word-wrap: normal;
+}
+
+button,
+[type="button"],
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button;
+}
+
+button:not(:disabled),
+[type="button"]:not(:disabled),
+[type="reset"]:not(:disabled),
+[type="submit"]:not(:disabled) {
+  cursor: pointer;
+}
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+  padding: 0;
+  border-style: none;
+}
+
+input[type="radio"],
+input[type="checkbox"] {
+  box-sizing: border-box;
+  padding: 0;
+}
+
+input[type="date"],
+input[type="time"],
+input[type="datetime-local"],
+input[type="month"] {
+  -webkit-appearance: listbox;
+}
+
+textarea {
+  overflow: auto;
+  resize: vertical;
+}
+
+fieldset {
+  min-width: 0;
+  padding: 0;
+  margin: 0;
+  border: 0;
+}
+
+legend {
+  display: block;
+  width: 100%;
+  max-width: 100%;
+  padding: 0;
+  margin-bottom: .5rem;
+  font-size: 1.5rem;
+  line-height: inherit;
+  color: inherit;
+  white-space: normal;
+}
+
+progress {
+  vertical-align: baseline;
+}
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+[type="search"] {
+  outline-offset: -2px;
+  -webkit-appearance: none;
+}
+
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+::-webkit-file-upload-button {
+  font: inherit;
+  -webkit-appearance: button;
+}
+
+output {
+  display: inline-block;
+}
+
+summary {
+  display: list-item;
+  cursor: pointer;
+}
+
+template {
+  display: none;
+}
+
+[hidden] {
+  display: none !important;
+}
+/*# sourceMappingURL=bootstrap-reboot.css.map */

dyndns/static/css/bootstrap-reboot.min.css

@@ -0,0 +1,8 @@
+/*!
+ * Bootstrap Reboot v4.3.1 (https://getbootstrap.com/)
+ * Copyright 2011-2019 The Bootstrap Authors
+ * Copyright 2011-2019 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
+ */*,::after,::before{box-sizing:border-box}html{font-family:sans-serif;line-height:1.15;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}article,aside,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;text-align:left;background-color:#fff}[tabindex="-1"]:focus{outline:0!important}hr{box-sizing:content-box;height:0;overflow:visible}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem}p{margin-top:0;margin-bottom:1rem}abbr[data-original-title],abbr[title]{text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;border-bottom:0;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:80%}sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#007bff;text-decoration:none;background-color:transparent}a:hover{color:#0056b3;text-decoration:underline}a:not([href]):not([tabindex]){color:inherit;text-decoration:none}a:not([href]):not([tabindex]):focus,a:not([href]):not([tabindex]):hover{color:inherit;text-decoration:none}a:not([href]):not([tabindex]):focus{outline:0}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em}pre{margin-top:0;margin-bottom:1rem;overflow:auto}figure{margin:0 0 1rem}img{vertical-align:middle;border-style:none}svg{overflow:hidden;vertical-align:middle}table{border-collapse:collapse}caption{padding-top:.75rem;padding-bottom:.75rem;color:#6c757d;text-align:left;caption-side:bottom}th{text-align:inherit}label{display:inline-block;margin-bottom:.5rem}button{border-radius:0}button:focus{outline:1px dotted;outline:5px auto -webkit-focus-ring-color}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,input{overflow:visible}button,select{text-transform:none}select{word-wrap:normal}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{padding:0;border-style:none}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}input[type=date],input[type=datetime-local],input[type=month],input[type=time]{-webkit-appearance:listbox}textarea{overflow:auto;resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{display:block;width:100%;max-width:100%;padding:0;margin-bottom:.5rem;font-size:1.5rem;line-height:inherit;color:inherit;white-space:normal}progress{vertical-align:baseline}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:none}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}summary{display:list-item;cursor:pointer}template{display:none}[hidden]{display:none!important}
+/*# sourceMappingURL=bootstrap-reboot.min.css.map */

dyndns/static/css/narrow-jumbotron.css

@@ -0,0 +1,79 @@
+/* Space out content a bit */
+body {
+  padding-top: 1.5rem;
+  padding-bottom: 1.5rem;
+}
+
+/* Everything but the jumbotron gets side spacing for mobile first views */
+.header,
+.marketing,
+.footer {
+  padding-right: 1rem;
+  padding-left: 1rem;
+}
+
+/* Custom page header */
+.header {
+  padding-bottom: 1rem;
+  border-bottom: .05rem solid #e5e5e5;
+}
+/* Make the masthead heading the same height as the navigation */
+.header h3 {
+  margin-top: 0;
+  margin-bottom: 0;
+  line-height: 3rem;
+}
+
+/* Custom page footer */
+.footer {
+  padding-top: 1.5rem;
+  color: #777;
+  border-top: .05rem solid #e5e5e5;
+}
+
+/* Customize container */
+@media (min-width: 56em) {
+  .container {
+    max-width: 54rem;
+  }
+}
+.container-narrow > hr {
+  margin: 2rem 0;
+}
+
+/* Main marketing message and sign up button */
+.jumbotron {
+  text-align: center;
+  border-bottom: .05rem solid #e5e5e5;
+}
+.jumbotron .btn {
+  padding: .75rem 1.5rem;
+  font-size: 1.5rem;
+}
+
+/* Supporting marketing content */
+.marketing {
+  margin: 3rem 0;
+}
+.marketing p + h4 {
+  margin-top: 1.5rem;
+}
+
+/* Responsive: Portrait tablets and up */
+@media screen and (min-width: 56em) {
+  /* Remove the padding we set earlier */
+  .header,
+  .marketing,
+  .footer {
+    padding-right: 0;
+    padding-left: 0;
+  }
+  /* Space out the masthead */
+  .header {
+    margin-bottom: 2rem;
+  }
+  /* Remove the bottom border on the jumbotron for visual effect */
+  .jumbotron {
+    border-bottom: 0;
+  }
+}

dyndns/static/icons/clipboard.svg

@@ -0,0 +1,4 @@
+<svg class="bi bi-clipboard" width="1em" height="1em" viewBox="0 0 16 16" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
+  <path fill-rule="evenodd" d="M4 1.5H3a2 2 0 00-2 2V14a2 2 0 002 2h10a2 2 0 002-2V3.5a2 2 0 00-2-2h-1v1h1a1 1 0 011 1V14a1 1 0 01-1 1H3a1 1 0 01-1-1V3.5a1 1 0 011-1h1v-1z" clip-rule="evenodd"/>
+  <path fill-rule="evenodd" d="M9.5 1h-3a.5.5 0 00-.5.5v1a.5.5 0 00.5.5h3a.5.5 0 00.5-.5v-1a.5.5 0 00-.5-.5zm-3-1A1.5 1.5 0 005 1.5v1A1.5 1.5 0 006.5 4h3A1.5 1.5 0 0011 2.5v-1A1.5 1.5 0 009.5 0h-3z" clip-rule="evenodd"/>
+</svg>

dyndns/static/icons/pencil.svg

@@ -0,0 +1,4 @@
+<svg class="bi bi-pencil" width="1em" height="1em" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
+  <path fill-rule="evenodd" d="M13.293 3.293a1 1 0 011.414 0l2 2a1 1 0 010 1.414l-9 9a1 1 0 01-.39.242l-3 1a1 1 0 01-1.266-1.265l1-3a1 1 0 01.242-.391l9-9zM14 4l2 2-9 9-3 1 1-3 9-9z" clip-rule="evenodd"/>
+  <path fill-rule="evenodd" d="M14.146 8.354l-2.5-2.5.708-.708 2.5 2.5-.708.708zM5 12v.5a.5.5 0 00.5.5H6v.5a.5.5 0 00.5.5H7v.5a.5.5 0 00.5.5H8v-1.5a.5.5 0 00-.5-.5H7v-.5a.5.5 0 00-.5-.5H5z" clip-rule="evenodd"/>
+</svg>

dyndns/static/icons/table.svg

@@ -0,0 +1,7 @@
+<svg class="bi bi-table" width="1em" height="1em" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
+  <path fill-rule="evenodd" d="M16 3H4a1 1 0 00-1 1v12a1 1 0 001 1h12a1 1 0 001-1V4a1 1 0 00-1-1zM4 2a2 2 0 00-2 2v12a2 2 0 002 2h12a2 2 0 002-2V4a2 2 0 00-2-2H4z" clip-rule="evenodd"/>
+  <path fill-rule="evenodd" d="M17 6H3V5h14v1z" clip-rule="evenodd"/>
+  <path fill-rule="evenodd" d="M7 17.5v-14h1v14H7zm5 0v-14h1v14h-1z" clip-rule="evenodd"/>
+  <path fill-rule="evenodd" d="M17 10H3V9h14v1zm0 4H3v-1h14v1z" clip-rule="evenodd"/>
+  <path d="M2 4a2 2 0 012-2h12a2 2 0 012 2v2H2V4z"/>
+</svg>

dyndns/static/icons/trash.svg

@@ -0,0 +1,4 @@
+<svg class="bi bi-trash" width="1em" height="1em" viewBox="0 0 20 20" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
+  <path d="M7.5 7.5A.5.5 0 018 8v6a.5.5 0 01-1 0V8a.5.5 0 01.5-.5zm2.5 0a.5.5 0 01.5.5v6a.5.5 0 01-1 0V8a.5.5 0 01.5-.5zm3 .5a.5.5 0 00-1 0v6a.5.5 0 001 0V8z"/>
+  <path fill-rule="evenodd" d="M16.5 5a1 1 0 01-1 1H15v9a2 2 0 01-2 2H7a2 2 0 01-2-2V6h-.5a1 1 0 01-1-1V4a1 1 0 011-1H8a1 1 0 011-1h2a1 1 0 011 1h3.5a1 1 0 011 1v1zM6.118 6L6 6.059V15a1 1 0 001 1h6a1 1 0 001-1V6.059L13.882 6H6.118zM4.5 5V4h11v1h-11z" clip-rule="evenodd"/>
+</svg>

dyndns/static/js/additional.js

@@ -0,0 +1,83 @@
+function deleteHost(id) {
+    $.ajax({
+        contentType: 'application/x-www-form-urlencoded; charset=UTF-8',
+        type: 'GET',
+        url: "/hosts/delete/" + id
+    }).done(function(data, textStatus, jqXHR) {
+        location.href="/hosts";
+    }).fail(function(jqXHR, textStatus, errorThrown) {
+        alert("Error: " + $.parseJSON(jqXHR.responseText).message);
+        location.reload()
+    });
+}
+
+function addEditHost(id, addedit) {
+    if (id == null) {
+        id = ""
+    } else {
+        id = "/"+id
+    }
+
+    $.ajax({
+        contentType: 'application/x-www-form-urlencoded; charset=UTF-8',
+        data: $('#edithostform').serialize(),
+        type: 'POST',
+        url: '/hosts/'+addedit+id,
+    }).done(function(data, textStatus, jqXHR) {
+        location.href="/hosts";
+    }).fail(function(jqXHR, textStatus, errorThrown) {
+        alert("Error: " + $.parseJSON(jqXHR.responseText).message);
+    });
+
+    return false;
+}
+
+function logOut(){
+        try {
+            // This is for Firefox
+            $.ajax({
+                // This can be any path on your same domain which requires HTTPAuth
+                url: "",
+                username: 'reset',
+                password: 'reset',
+                // If the return is 401, refresh the page to request new details.
+                statusCode: { 401: function() {
+                        document.location = document.location;
+                    }
+                }
+            });
+        } catch (exception) {
+            // Firefox throws an exception since we didn't handle anything but a 401 above
+            // This line works only in IE
+            if (!document.execCommand("ClearAuthenticationCache")) {
+                // exeCommand returns false if it didn't work (which happens in Chrome) so as a last
+                // resort refresh the page providing new, invalid details.
+                document.location = "http://reset:reset@" + document.location.hostname + document.location.pathname;
+            }
+        }
+}
+
+function randomHash() {
+    var chars = "abcdefghijklmnopqrstuvwxyz!@#$%^&*()-+<>ABCDEFGHIJKLMNOP1234567890";
+    var pass = "";
+    for (var x = 0; x < 32; x++) {
+        var i = Math.floor(Math.random() * chars.length);
+        pass += chars.charAt(i);
+    }
+    return pass;
+}
+
+function generateUsername() {
+    edithostform.username.value = randomHash();
+}
+
+function generatePassword() {
+    edithostform.password.value = randomHash();
+}
+
+function copyToClipboard(inputId) {
+    var copyText = document.getElementById(inputId);
+    copyText.select();
+    copyText.setSelectionRange(0, 99999);
+    document.execCommand("copy");
+}

dyndns/static/js/ie10-viewport-bug-workaround.js

@@ -0,0 +1,24 @@
+/*!
+ * IE10 viewport hack for Surface/desktop Windows 8 bug
+ * Copyright 2014-2017 The Bootstrap Authors
+ * Copyright 2014-2017 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+// See the Getting Started docs for more information:
+// https://getbootstrap.com/getting-started/#support-ie10-width
+
+(function () {
+  'use strict'
+
+  if (navigator.userAgent.match(/IEMobile\/10\.0/)) {
+    var msViewportStyle = document.createElement('style')
+    msViewportStyle.appendChild(
+      document.createTextNode(
+        '@-ms-viewport{width:auto!important}'
+      )
+    )
+    document.head.appendChild(msViewportStyle)
+  }
+
+}())

dyndns/views/edithost.html

@@ -0,0 +1,69 @@
+{{define "content"}}
+    <div class="p-4" style="background-color: #e9ecef">
+        <h3 class="text-center mb-4">{{if eq .addEdit "edit" }}Edit{{else if eq .addEdit "add" }}Add{{end}} Host Entry</h3>
+            <form id="edithostform" action="javascript:void(0);">
+            <div class="row mt-3">
+                <div class="col-1"></div>
+                <div class="col-2 text-right">Hostname:</div>
+                <div class="col-8 input-group">
+                    <input type="text" class="form-control" placeholder="Enter hostname" name="hostname" value="{{.host.Hostname}}" {{if eq .addEdit "edit" }}readonly{{end}}>
+                    <div class="input-group-append">
+                        <span class="input-group-text" id="basic-addon2">.{{.config.Domain}}</span>
+                    </div>
+                </div>
+                <div class="col-1"></div>
+            </div>
+            <div class="row mt-3">
+                <div class="col-1"></div>
+                <div class="col-2 text-right">IP Address:</div>
+                <div class="col-8"><input type="text" class="form-control" placeholder="Enter IP Address" name="ip" value="{{.host.Ip}}"></div>
+                <div class="col-1"></div>
+            </div>
+            <div class="row mt-3">
+                <div class="col-1"></div>
+                <div class="col-2 text-right">TTL:</div>
+                <div class="col-8">
+                    <select class="form-control" name="ttl">
+                        <option value="20" {{if .host.Ttl }}{{if eq .host.Ttl 20 }}selected{{end}}{{end}}>20 s.  Super dynamic DNS for frequent updates</option>
+                        <option value="60" {{if .host.Ttl }}{{if eq .host.Ttl 60 }}selected{{end}}{{end}}>60 s.  Default dynamic DNS value</option>
+                        <option value="3600" {{if .host.Ttl }}{{if eq .host.Ttl 3600 }}selected{{end}}{{end}}>1 hr.  Rarely updated IP address</option>
+                        <option value="14400" {{if .host.Ttl }}{{if eq .host.Ttl 14400 }}selected{{end}}{{end}}>4 hrs. Static record with benefits of DNS caching</option>
+                    </select>
+                </div>
+                <div class="col-1"></div>
+            </div>
+            <div class="row mt-3">
+                <div class="col-1"></div>
+                <div class="col-2 text-right">Username:</div>
+                <div class="col-8 input-group">
+                    <div class="input-group-prepend">
+                        <button class="btn btn-outline-secondary" type="button" onclick="copyToClipboard('username')"><img src="/static/icons/clipboard.svg" style="vertical-align: baseline" alt="" width="16" height="16" title="Copy"></button>
+                    </div>
+                    <input type="text" class="form-control" placeholder="Enter username" name="username" id="username" value="{{.host.UserName}}">
+                    <div class="input-group-append">
+                        <button class="btn btn-outline-secondary" type="button" onclick="generateUsername()">Generate</button>
+                    </div>
+                </div>
+                <div class="col-1"></div>
+            </div>
+            <div class="row mt-3">
+                <div class="col-1"></div>
+                <div class="col-2 text-right">Password:</div>
+                <div class="col-8 input-group">
+                    <div class="input-group-prepend">
+                        <button class="btn btn-outline-secondary" type="button" onclick="copyToClipboard('password')"><img src="/static/icons/clipboard.svg" style="vertical-align: baseline" alt="" width="16" height="16" title="Copy"></button>
+                    </div>
+                    <input type="text" class="form-control" placeholder="Enter password" name="password" id="password" value="{{.host.Password}}">
+                    <div class="input-group-append">
+                        <button class="btn btn-outline-secondary" type="button" onclick="generatePassword()">Generate</button>
+                    </div>
+                </div>
+                <div class="col-1"></div>
+            </div>
+            <div class="row mt-3">
+                <div class="col-11 d-flex justify-content-end"><button class="btn btn-primary" onclick="addEditHost({{.host.ID}}, {{.addEdit}})">{{if eq .addEdit "edit" }}Edit{{else if eq .addEdit "add" }}Add{{end}} Host Entry</button></div>
+                <div class="col-1"></div>
+            </div>
+        </form>
+    </div>
+{{end}}

dyndns/views/index.html

@@ -0,0 +1,31 @@
+{{define "content"}}
+    <div class="jumbotron">
+        <h1 class="display-3">Jumbotron heading</h1>
+        <p class="lead">Cras justo odio, dapibus ac facilisis in, egestas eget quam. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
+        <p><a class="btn btn-lg btn-success" href="#" role="button">Sign up today</a></p>
+    </div>
+
+    <div class="row marketing">
+        <div class="col-lg-6">
+            <h4>Subheading</h4>
+            <p>Donec id elit non mi porta gravida at eget metus. Maecenas faucibus mollis interdum.</p>
+
+            <h4>Subheading</h4>
+            <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Cras mattis consectetur purus sit amet fermentum.</p>
+
+            <h4>Subheading</h4>
+            <p>Maecenas sed diam eget risus varius blandit sit amet non magna.</p>
+        </div>
+
+        <div class="col-lg-6">
+            <h4>Subheading</h4>
+            <p>Donec id elit non mi porta gravida at eget metus. Maecenas faucibus mollis interdum.</p>
+
+            <h4>Subheading</h4>
+            <p>Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Cras mattis consectetur purus sit amet fermentum.</p>
+
+            <h4>Subheading</h4>
+            <p>Maecenas sed diam eget risus varius blandit sit amet non magna.</p>
+        </div>
+    </div>
+{{end}}

dyndns/views/layouts/master.html

@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+    <meta name="description" content="">
+    <meta name="author" content="">
+    <link rel="icon" href="/static/icons/favicon.ico">
+
+    <title>Narrow Jumbotron Template for Bootstrap</title>
+
+    <!-- Bootstrap core CSS -->
+    <link href="/static/css/bootstrap.min.css" rel="stylesheet">
+
+    <!-- Custom styles for this template -->
+    <link href="/static/css/narrow-jumbotron.css" rel="stylesheet">
+</head>
+
+<body>
+
+<div class="container">
+    <!-- Navigation -->
+    <div class="header clearfix">
+        <nav>
+            <ul class="nav nav-pills float-right">
+                <li class="nav-item">
+                    <a class="nav-link active" href="/hosts">Hosts <span class="sr-only">(current)</span></a>
+                </li>
+                <li class="nav-item">
+                    <a class="nav-link" href="/logs">Logs</a>
+                </li>
+                <li class="nav-item">
+                    <a class="nav-link" href="" onclick="logOut()">Logout</a>
+                </li>
+            </ul>
+        </nav>
+        <h3 class="text-muted">TheBBCloud DynDNS</h3>
+    </div>
+
+    <!-- Page Content -->
+    {{template "content" .}}
+
+    <footer class="footer">
+        <p>&copy; TheBBCloud 2020</p>
+    </footer>
+
+</div> <!-- /container -->
+
+<!-- Bootstrap core JavaScript
+================================================== -->
+<!-- Placed at the end of the document so the pages load faster -->
+<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
+<script src="/static/js/ie10-viewport-bug-workaround.js"></script>
+<script src="/static/js/jquery-3.4.1.min.js"></script>
+<script src="/static/js/bootstrap.bundle.min.js"></script>
+<script src="/static/js/additional.js"></script>
+</body>
+</html>

dyndns/views/listhosts.html

@@ -0,0 +1,27 @@
+{{define "content"}}
+    <div class="container marketing">
+        <h3 class="text-center mb-4">DNS Host Entries</h3>
+        <table class="table table-striped text-center">
+            <thead>
+            <tr>
+                <th>Hostname</th>
+                <th>IP</th>
+                <th>TTL</th>
+                <th>LastUpdate</th>
+                <th><button class="btn btn-primary" onclick="location.href='/hosts/add'">Add Host Entry</button></th>
+            </tr>
+            </thead>
+            <tbody>
+            {{range .hosts}}
+                <tr>
+                    <td>{{.Hostname}}.{{$.config.Domain}}</td>
+                    <td>{{.Ip}}</td>
+                    <td>{{.Ttl}}</td>
+                    <td>{{.LastUpdate.Format "01/02/2006 15:04 MEZ"}}</td>
+                    <td><button onclick="location.href='/hosts/edit/{{.ID}}'" class="btn btn-outline-secondary btn-sm"><img src="/static/icons/pencil.svg" alt="" width="16" height="16" title="Edit"></button>&nbsp;<button class="btn btn-outline-secondary btn-sm" onclick="deleteHost('{{.ID}}')"><img src="/static/icons/trash.svg" alt="" width="16" height="16" title="Delete"></button> <button class="btn btn-outline-secondary btn-sm" onclick="location.href='/logs/host/{{.ID}}'"><img src="/static/icons/table.svg" alt="" width="16" height="16" title="Logs"></button></td>
+                </tr>
+            {{end}}
+            </tbody>
+        </table>
+    </div>
+{{end}}

dyndns/views/listlogs.html

@@ -0,0 +1,29 @@
+{{define "content"}}
+    <div class="container marketing">
+        <h3 class="text-center mb-4">Log Entries</h3>
+        <table class="table table-striped text-center" style="font-size: 14px">
+            <thead>
+            <tr>
+                <th>Status</th>
+                <th>Hostname</th>
+                <th>IP sent</th>
+                <th>Timestamp</th>
+                <th>User Agent</th>
+                <th>Caller IP</th>
+            </tr>
+            </thead>
+            <tbody>
+            {{range .logs}}
+                <tr>
+                    <td class="align-middle mx-auto"><div class="{{if .Status}}bg-success{{else}}bg-danger{{end}}" style="width: 16px; height: 16px; margin: auto"></div></td>
+                    <td>{{.Host.Hostname}}.{{$.config.Domain}}</td>
+                    <td>{{.SentIP}}</td>
+                    <td>{{.CreatedAt.Format "01/02/2006 15:04"}}</td>
+                    <td>{{.UserAgent}}</td>
+                    <td>{{.CallerIP}}</td>
+                </tr>
+            {{end}}
+            </tbody>
+        </table>
+    </div>
+{{end}}