luci-mod-network: dhcp.js: fix validation logic

The `server` option allows plain IPs besides the `/domain/addr` format.

Fixes: #3870
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 15 insertions, 6 deletions

diff --git a/modules/luci-mod-network/htdocs/luci-static/resources/view/network/dhcp.js b/modules/luci-mod-network/htdocs/luci-static/resources/view/network/dhcp.js
index 525526d62f..6551b72731 100644
--- a/modules/luci-mod-network/htdocs/luci-static/resources/view/network/dhcp.js
+++ b/modules/luci-mod-network/htdocs/luci-static/resources/view/network/dhcp.js
@@ -99,7 +99,7 @@ function validateServerSpec(sid, s) {
 	if (s == null || s == '')
 		return true;
 
-	var m = s.match(/^\/(.+)\/(.*)$/);
+	var m = s.match(/^(?:\/(.+)\/)?(.*)$/);
 	if (!m)
 		return _('Expecting: %s').format(_('valid hostname'));
 
@@ -116,11 +116,20 @@ function validateServerSpec(sid, s) {
 
 	if (!m)
 		return _('Expecting: %s').format(_('valid IP address'));
-	else if (validation.parseIPv4(m[1]) && m[3] != null && !validation.parseIPv4(m[3]))
-		return _('Expecting: %s').format(_('valid IPv4 address'));
-	else if (validation.parseIPv6(m[1]) && m[3] != null && !validation.parseIPv6(m[3]))
-		return _('Expecting: %s').format(_('valid IPv6 address'));
-	else if ((m[2] != null && +m[2] > 65535) || (m[4] != null && +m[4] > 65535))
+
+	if (validation.parseIPv4(m[1])) {
+		if (m[3] != null && !validation.parseIPv4(m[3]))
+			return _('Expecting: %s').format(_('valid IPv4 address'));
+	}
+	else if (validation.parseIPv6(m[1])) {
+		if (m[3] != null && !validation.parseIPv6(m[3]))
+			return _('Expecting: %s').format(_('valid IPv6 address'));
+	}
+	else {
+		return _('Expecting: %s').format(_('valid IP address'));
+	}
+
+	if ((m[2] != null && +m[2] > 65535) || (m[4] != null && +m[4] > 65535))
 		return _('Expecting: %s').format(_('valid port value'));
 
 	return true;