cnbugs/dhcp-dns-manager
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Fix config hot-reload for serverIP

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- Add getServerIP() method to dynamically read Gateway from config
- Update sendOffer, sendACK, sendNAK to use getServerIP()
- This ensures gateway IP updates when config changes via web UI
This commit is contained in:
CNBUGS AI
2026-04-24 16:50:40 +08:00
parent 1a0e743a71
commit 9d0bae5d0c
1 changed files with 9 additions and 3 deletions
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internal/dhcp/server.go
+9 -3
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@@ -76,6 +76,12 @@ func (s *Server) getConfig() *config.DHCPConfig {
return s.config
}
// getServerIP returns the server IP for DHCP options
func (s *Server) getServerIP() net.IP {
cfg := s.getConfig()
return net.ParseIP(cfg.Gateway).To4()
}
func (s *Server) Start() error {
if !s.config.Enabled {
return nil
@@ -383,7 +389,7 @@ func (s *Server) sendOffer(data []byte, clientMAC, offeredIP string, remoteAddr
response = appendOption(response, OptionLeaseTime, leaseTime)
// Add server identifier
response = appendOption(response, OptionServerIdentifier, []byte(s.serverIP.To4()))
response = appendOption(response, OptionServerIdentifier, []byte(s.getServerIP().To4()))
// Add end option
response = append(response, OptionEnd)
@@ -412,7 +418,7 @@ func (s *Server) sendACK(data []byte, clientMAC, ip string, remoteAddr *net.UDPA
binary.BigEndian.PutUint32(leaseTime, uint32(s.getConfig().LeaseTime))
response = appendOption(response, OptionLeaseTime, leaseTime)
response = appendOption(response, OptionServerIdentifier, []byte(s.serverIP.To4()))
response = appendOption(response, OptionServerIdentifier, []byte(s.getServerIP().To4()))
response = append(response, OptionEnd)
targetAddr := s.getResponseAddr(data, remoteAddr)
@@ -421,7 +427,7 @@ func (s *Server) sendACK(data []byte, clientMAC, ip string, remoteAddr *net.UDPA
func (s *Server) sendNAK(data []byte, remoteAddr *net.UDPAddr) {
response := buildDHCPMessage(MsgNAK, data, "0.0.0.0", s.config)
response = appendOption(response, OptionServerIdentifier, []byte(s.serverIP.To4()))
response = appendOption(response, OptionServerIdentifier, []byte(s.getServerIP().To4()))
response = append(response, OptionEnd)
// NAK must always be broadcast