allow search domain in global settings

go.mod

@@ -25,6 +25,7 @@ require (
 )
 
 require (
+	github.com/chmike/domain v1.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-test/deep v1.1.0 // indirect

go.sum

@@ -1,5 +1,7 @@
 github.com/NicoNex/echotron/v3 v3.39.0 h1:DIOskt7z2oLt6uk3eyM09XJJzDsIJuRlJXZdoE/H/Zs=
 github.com/NicoNex/echotron/v3 v3.39.0/go.mod h1:7LvjveJmezuUOeaoA3nzQduNlSPQYfq219Z+baKY04Q=
+github.com/chmike/domain v1.1.0 h1:615mGyA/ghxvIFBdAaYuB2azxAsUxrpm6Cv5UiL6VPo=
+github.com/chmike/domain v1.1.0/go.mod h1:h558M2qGKpYRUxHHNyey6puvXkZBjvjmseOla/d1VGQ=
 github.com/coreos/bbolt v1.3.1-coreos.6.0.20180223184059-4f5275f4ebbf/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 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=

handler/routes.go

@@ -1015,7 +1015,7 @@ func GlobalSettingSubmit(db store.IStore) echo.HandlerFunc {
 		c.Bind(&globalSettings)
 
 		// validate the input dns server list
-		if util.ValidateIPAddressList(globalSettings.DNSServers) == false {
+		if !util.ValidateIPAndSearchDomainAddressList(globalSettings.DNSServers) {
 			log.Warnf("Invalid DNS server list input from user: %v", globalSettings.DNSServers)
 			return c.JSON(http.StatusBadRequest, jsonHTTPResponse{false, "Invalid DNS server address"})
 		}

util/util.go

@@ -25,6 +25,7 @@ import (
 	"github.com/skip2/go-qrcode"
 	"golang.org/x/mod/sumdb/dirhash"
 
+	"github.com/chmike/domain"
 	externalip "github.com/glendc/go-external-ip"
 	"github.com/labstack/gommon/log"
 	"github.com/rwillert/wireguard-ui/model"
@@ -117,23 +118,20 @@ func ContainsCIDR(ipnet1, ipnet2 *net.IPNet) bool {
 // ValidateCIDR to validate a network CIDR
 func ValidateCIDR(cidr string) bool {
 	_, _, err := net.ParseCIDR(cidr)
-	if err != nil {
-		return false
-	}
-	return true
+	return err == nil
 }
 
 // ValidateCIDRList to validate a list of network CIDR
 func ValidateCIDRList(cidrs []string, allowEmpty bool) bool {
 	for _, cidr := range cidrs {
 		if allowEmpty {
 			if len(cidr) > 0 {
-				if ValidateCIDR(cidr) == false {
+				if !ValidateCIDR(cidr) {
 					return false
 				}
 			}
 		} else {
-			if ValidateCIDR(cidr) == false {
+			if !ValidateCIDR(cidr) {
 				return false
 			}
 		}
@@ -143,42 +141,45 @@ func ValidateCIDRList(cidrs []string, allowEmpty bool) bool {
 
 // ValidateAllowedIPs to validate allowed ip addresses in CIDR format
 func ValidateAllowedIPs(cidrs []string) bool {
-	if ValidateCIDRList(cidrs, false) == false {
-		return false
-	}
-	return true
+	return ValidateCIDRList(cidrs, false)
 }
 
 // ValidateExtraAllowedIPs to validate extra Allowed ip addresses, allowing empty strings
 func ValidateExtraAllowedIPs(cidrs []string) bool {
-	if ValidateCIDRList(cidrs, true) == false {
-		return false
-	}
-	return true
+	return ValidateCIDRList(cidrs, true)
 }
 
 // ValidateServerAddresses to validate allowed ip addresses in CIDR format
 func ValidateServerAddresses(cidrs []string) bool {
-	if ValidateCIDRList(cidrs, false) == false {
-		return false
-	}
-	return true
+	return ValidateCIDRList(cidrs, false)
 }
 
 // ValidateIPAddress to validate the IPv4 and IPv6 address
 func ValidateIPAddress(ip string) bool {
-	if net.ParseIP(ip) == nil {
-		return false
-	}
-	return true
+	return net.ParseIP(ip) != nil
 }
 
-// ValidateIPAddressList to validate a list of IPv4 and IPv6 addresses
-func ValidateIPAddressList(ips []string) bool {
-	for _, ip := range ips {
-		if ValidateIPAddress(ip) == false {
-			return false
+// ValidateDomainName to validate domain name
+func ValidateDomainName(name string) bool {
+	return domain.Check(name) == nil
+}
+
+// ValidateIPAndSearchDomainAddressList to validate a list of IPv4 and IPv6 addresses plus added search domains
+func ValidateIPAndSearchDomainAddressList(entries []string) bool {
+	ip := false
+	domain := false
+	for _, entry := range entries {
+		// ip but not after domain
+		if ValidateIPAddress(entry) && !domain {
+			ip = true
+			continue
 		}
+		// domain and after ip
+		if ValidateDomainName(entry) && ip {
+			domain = true
+			continue
+		}
+		return false
 	}
 	return true
 }