save records, fix . problem, extend readme

.gitignore

@@ -2,3 +2,5 @@ gertdns
 gertdns.exe
 conf.toml
 auth.toml
+*.v4.csv
+*.v6.csv

README.md

@@ -53,3 +53,28 @@ Default: `conf.toml`
 Will define what file should be used to define users that can log in.  
 Type: `string`  
 Default: `auth.toml`
+
+### --data-path
+Will define where stored data is put (i.e. IP addresses for subdomains). All records will be saved here every second if they have been changed and when the application gets shut down.  
+Type: `string`  
+Default: `./`
+
+## Routes
+### `/`
+If in debug mode, will output all registered records, otherwise prints `"Working"`.
+
+### `/update/{domain}/{type}`
+Updates a given record.  
+#### URL parts
+`domain` (`string`): defines the subdomain that is to be modified  
+`type` (`"v4"` | `"v6"`): specifies whether an IPv4 or IPv6 record is to be changed.  
+#### query parameters
+`ipv4` (`string`) (only if `type` is `"v4"`): specifies the IPv4 address to be applied.  
+`ipv6` (`string`) (only if `type` is `"v6"`): specifies the IPv6 address to be applied.  
+`user` (`string`): username as specified in _auth file_.
+`password` (`string`): password as specified in _auth file_.
+
+#### examples
+/update/**example.example**/**v4**?ipv4=**127.0.0.1**&user=**username**&password=**password**  
+
+/update/**example.example**/**v6**?ipv6=**::1**&user=**username**&password=**password**  

auth/auth.go

@@ -1,8 +1,6 @@
 package auth
 
 import (
-	"log"
-
 	"github.com/raja/argon2pw"
 )
 
@@ -73,8 +71,6 @@ func Init(authFilePath string) error {
 	}
 
 	for name, user := range users {
-		log.Printf("%s\n", name)
-		log.Printf("%+v\n", user)
 		parsedUser, err := user.Tidy()
 		if err != nil {
 			return err

dns/dns.go

@@ -1,35 +1,141 @@
 package dns
 
 import (
+	"bufio"
 	"errors"
 	"fmt"
 	"log"
+	"os"
+	"path"
 	"strconv"
+	"strings"
 	"sync"
+	"time"
 
 	"github.com/MarekWojt/gertdns/config"
+	"github.com/MarekWojt/gertdns/util"
+	"github.com/gookit/color"
 	"github.com/miekg/dns"
 )
 
+var domains []*domain = make([]*domain, 0)
+var saveTicker *time.Ticker = time.NewTicker(time.Second)
+var saving sync.Mutex = sync.Mutex{}
+var currentDataPath string
+
+const (
+	IPV4_FILE = "v4.csv"
+	IPV6_FILE = "v6.csv"
+)
+
 type domain struct {
-	Root  string
-	Mutv4 sync.RWMutex
-	Mutv6 sync.RWMutex
-	Ipv4  map[string]string
-	Ipv6  map[string]string
+	Root         string
+	Mutv4        sync.RWMutex
+	Mutv6        sync.RWMutex
+	Mutv4Changed sync.RWMutex
+	Mutv6Changed sync.RWMutex
+	Ipv4         map[string]string
+	Ipv4Changed  bool
+	Ipv6         map[string]string
+	Ipv6Changed  bool
 }
 
-var domains []*domain = make([]*domain, 0)
+func (currentDomain *domain) IsV4Changed() bool {
+	currentDomain.Mutv4Changed.RLock()
+	result := currentDomain.Ipv4Changed
+	currentDomain.Mutv4Changed.RUnlock()
 
-func Init() {
+	return result
+}
+
+func (currentDomain *domain) IsV6Changed() bool {
+	currentDomain.Mutv6Changed.RLock()
+	result := currentDomain.Ipv6Changed
+	currentDomain.Mutv6Changed.RUnlock()
+
+	return result
+}
+
+func (currentDomain *domain) MarkV6Changed(changed bool) {
+	currentDomain.Mutv6Changed.Lock()
+	currentDomain.Ipv6Changed = changed
+	currentDomain.Mutv6Changed.Unlock()
+}
+
+func (currentDomain *domain) MarkV4Changed(changed bool) {
+	currentDomain.Mutv4Changed.Lock()
+	currentDomain.Ipv4Changed = changed
+	currentDomain.Mutv4Changed.Unlock()
+}
+
+func (currentDomain *domain) SetV4(domain string, ipv4 string) {
+	currentDomain.Mutv4.Lock()
+	currentDomain.Ipv4[domain] = ipv4
+	currentDomain.Mutv4.Unlock()
+}
+
+func (currentDomain *domain) SetV6(domain string, ipv6 string) {
+	currentDomain.Mutv6.Lock()
+	currentDomain.Ipv6[domain] = ipv6
+	currentDomain.Mutv6.Unlock()
+}
+
+func loadFile(ty string, currentDomain *domain) {
+	if ty != IPV4_FILE && ty != IPV6_FILE {
+		panic("type passed to loadFile must be either IPV4_FILE or IPV6_FILE")
+	}
+
+	filePath := path.Join(currentDataPath, currentDomain.Root+ty)
+	f, err := os.Open(filePath)
+	if err != nil {
+		color.Warnf("Could not load file for domain %s: %s\n", currentDomain.Root, err)
+	} else {
+		log.Printf("Reading file: %s", filePath)
+		scanner := bufio.NewScanner(f)
+
+		lineCounter := 0
+		for scanner.Scan() {
+			lineCounter++
+			currentLine := scanner.Text()
+			cols := strings.Split(currentLine, "\t")
+			if len(cols) < 2 {
+				color.Warnf("Error reading line %d of ipv4 addresses for domain %s: too few columns\n", lineCounter, currentDomain.Root)
+				continue
+			}
+
+			if ty == IPV4_FILE {
+				currentDomain.Ipv4[cols[0]] = cols[1]
+			} else if ty == IPV6_FILE {
+				currentDomain.Ipv6[cols[0]] = cols[1]
+			}
+		}
+		color.Infof("Read file: %s\n", filePath)
+	}
+	f.Close()
+}
+
+func Init(dataPath string) {
+	currentDataPath = dataPath
 	for _, currentDomain := range config.Config.DNS.Domains {
+		currentDomain = util.ParseDomain(currentDomain)
 		log.Printf("Added domain root: %s\n", currentDomain)
-		domains = append(domains, &domain{
+
+		domainObj := &domain{
 			Root: currentDomain,
 			Ipv4: make(map[string]string),
 			Ipv6: make(map[string]string),
-		})
+		}
+		domains = append(domains, domainObj)
+		loadFile(IPV4_FILE, domainObj)
+		loadFile(IPV6_FILE, domainObj)
 	}
+
+	go func() {
+		for {
+			<-saveTicker.C
+			Save()
+		}
+	}()
 }
 
 func Run() (*dns.Server, error) {
@@ -54,9 +160,12 @@ func UpdateIpv6(domain string, ipv6 string) error {
 	for _, currentDomain := range domains {
 		if dns.IsSubDomain(currentDomain.Root, domain) {
 			log.Printf("Updating domain %s AAAA %s\n", domain, ipv6)
-			currentDomain.Mutv6.Lock()
-			currentDomain.Ipv6[domain] = ipv6
-			currentDomain.Mutv6.Unlock()
+
+			if !currentDomain.IsV6Changed() {
+				currentDomain.MarkV6Changed(true)
+			}
+
+			currentDomain.SetV6(domain, ipv6)
 			return nil
 		}
 	}
@@ -66,11 +175,15 @@ func UpdateIpv6(domain string, ipv6 string) error {
 
 func UpdateIpv4(domain string, ipv4 string) (err error) {
 	for _, currentDomain := range domains {
+		log.Printf("%s sub of %s ?\n", domain, currentDomain.Root)
 		if dns.IsSubDomain(currentDomain.Root, domain) {
 			log.Printf("Updating domain %s A %s\n", domain, ipv4)
-			currentDomain.Mutv4.Lock()
-			currentDomain.Ipv4[domain] = ipv4
-			currentDomain.Mutv4.Unlock()
+
+			if !currentDomain.IsV4Changed() {
+				currentDomain.MarkV4Changed(true)
+			}
+
+			currentDomain.SetV4(domain, ipv4)
 			return nil
 		}
 	}
@@ -125,3 +238,54 @@ func handleDnsRequest(currentDomain *domain) func(w dns.ResponseWriter, r *dns.M
 		w.WriteMsg(m)
 	}
 }
+
+func Save() (errs []error) {
+	saving.Lock()
+	for _, domain := range domains {
+		if domain.IsV4Changed() {
+			ipv4Data := ""
+			domain.Mutv4.RLock()
+			for key, val := range domain.Ipv4 {
+				ipv4Data += key + "\t" + val + "\n"
+			}
+			domain.Mutv4.RUnlock()
+			err := os.WriteFile(path.Join(currentDataPath, domain.Root+IPV4_FILE), []byte(ipv4Data), 0644)
+			if err != nil {
+				errs = append(errs, err)
+				color.Errorf("Failed to save ipv4 data for domain %s: %s\n", domain.Root, err)
+			} else {
+				// did successfully save, so mark as saved
+				domain.MarkV4Changed(false)
+			}
+		}
+
+		if domain.IsV6Changed() {
+			ipv6Data := ""
+			domain.Mutv6.RLock()
+			for key, val := range domain.Ipv6 {
+				ipv6Data += key + "\t" + val + "\n"
+			}
+			domain.Mutv6.RUnlock()
+			err := os.WriteFile(path.Join(currentDataPath, domain.Root+IPV6_FILE), []byte(ipv6Data), 0644)
+			if err != nil {
+				errs = append(errs, err)
+				color.Errorf("Failed to save ipv6 data for domain %s: %s\n", domain.Root, err)
+			} else {
+				// did successfully save, so mark as saved
+				domain.MarkV6Changed(false)
+			}
+		}
+	}
+	saving.Unlock()
+
+	errLen := len(errs)
+	if errLen > 0 {
+		color.Errorf("%d errors occurred while trying to save\n", errLen)
+	}
+	return
+}
+
+func Shutdown() {
+	saveTicker.Stop()
+	Save()
+}

main.go

@@ -3,6 +3,9 @@ package main
 import (
 	"flag"
 	"log"
+	"os"
+	"os/signal"
+	"syscall"
 
 	"github.com/MarekWojt/gertdns/auth"
 	"github.com/MarekWojt/gertdns/config"
@@ -14,6 +17,7 @@ import (
 var (
 	configFile      = flag.String("config-file", "conf.toml", "Path to configuration file")
 	authFile        = flag.String("auth-file", "auth.toml", "Path to authentication file")
+	dataPath        = flag.String("data-path", "./", "Where to save data")
 	enableDebugMode = flag.Bool("enable-debug-mode", false, "Enables debug mode, will output a list of all registered records on the index page of the HTTP server")
 )
 
@@ -30,7 +34,7 @@ func main() {
 		log.Fatalf("Failed to load configuration: %s\n ", err.Error())
 	}
 
-	dns.Init()
+	dns.Init(*dataPath)
 	web.Init(*enableDebugMode)
 	err = auth.Init(*authFile)
 	if err != nil {
@@ -69,8 +73,17 @@ func main() {
 		webChan <- err
 	}()
 
+	c := make(chan os.Signal)
+	signal.Notify(c, os.Interrupt, os.Kill, syscall.SIGTERM)
+	go func() {
+		<-c
+		dns.Shutdown()
+		os.Exit(0)
+	}()
+
 	currentDnsResult := <-dnsChan
 	defer currentDnsResult.server.Shutdown()
+	defer dns.Shutdown()
 	<-webChan
 	<-webChan
 }

util/util.go

@@ -0,0 +1,11 @@
+package util
+
+import "strings"
+
+func ParseDomain(domain string) string {
+	if !strings.HasSuffix(domain, ".") {
+		return domain + "."
+	}
+
+	return domain
+}

web/web.go

@@ -8,6 +8,7 @@ import (
 	"github.com/MarekWojt/gertdns/auth"
 	"github.com/MarekWojt/gertdns/config"
 	"github.com/MarekWojt/gertdns/dns"
+	"github.com/MarekWojt/gertdns/util"
 	"github.com/fasthttp/router"
 	"github.com/valyala/fasthttp"
 )
@@ -85,6 +86,7 @@ func index(ctx *fasthttp.RequestCtx) {
 
 func updateV4(ctx *fasthttp.RequestCtx) {
 	domain := ctx.UserValue("domain").(string)
+	domain = util.ParseDomain(domain)
 	ipv4 := string(ctx.QueryArgs().PeekBytes(ipv4Param))
 	if ipv4 == "" {
 		ctx.WriteString("Missing ipv4 query parameter")
@@ -104,6 +106,7 @@ func updateV4(ctx *fasthttp.RequestCtx) {
 
 func updateV6(ctx *fasthttp.RequestCtx) {
 	domain := ctx.UserValue("domain").(string)
+	domain = util.ParseDomain(domain)
 	ipv6 := string(ctx.QueryArgs().PeekBytes(ipv6Param))
 	if ipv6 == "" {
 		ctx.WriteString("Missing ipv6 query parameter")
@@ -129,6 +132,7 @@ func authenticatedRequest(request func(ctx *fasthttp.RequestCtx)) func(ctx *fast
 			ctx.SetStatusCode(fasthttp.StatusBadRequest)
 			return
 		}
+		domain = util.ParseDomain(domain)
 
 		user := string(ctx.QueryArgs().PeekBytes(userParam))
 		if user == "" {