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e4e023e6fb
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@ -9349,62 +9349,35 @@ UINT ServeDhcpDiscoverEx(VH *v, UCHAR *mac, UINT request_ip, bool is_static_ip)
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// check whether it is a request from the same MAC address
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if (Cmp(mac, d->MacAddress, 6) == 0)
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{
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// Examine whether the specified IP address is within the range of assignment
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// Examine whether the specified IP address is within the range of static assignment
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if (Endian32(v->DhcpIpStart) > Endian32(request_ip) ||
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Endian32(request_ip) > Endian32(v->DhcpIpEnd))
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{
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// Accept if within the range
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// Accept if within the range of static assignment
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ret = request_ip;
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}
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}
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else {
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// Duplicated IPV4 address found. The DHCP server replies to DHCPREQUEST with DHCP NAK.
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// Duplicated IPV4 address found. The specified IP address is not available for use
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char ipstr[MAX_HOST_NAME_LEN + 1] = { 0 };
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char macstr[128] = { 0 };
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IPToStr32(ipstr, sizeof(ipstr), request_ip);
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BinToStr(macstr, sizeof(macstr), d->MacAddress, 6);
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Debug("Virtual DHC Server: Duplicated IP address detected. Static IP: %s, Used by MAC:%s\n", ipstr, macstr);
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return ret;
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MacToStr(macstr, sizeof(macstr), d->MacAddress);
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Debug("Virtual DHC Server: Duplicated IP address detected. Static IP: %s, with the MAC: %s\n", ipstr, macstr);
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}
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}
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else
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{
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// Examine whether the specified IP address is within the range of assignment
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// Examine whether the specified IP address is within the range of static assignment
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if (Endian32(v->DhcpIpStart) > Endian32(request_ip) ||
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Endian32(request_ip) > Endian32(v->DhcpIpEnd))
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{
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// Accept if within the range
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// Accept if within the range of static assignment
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ret = request_ip;
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}
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else
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{
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// Propose an IP in the range since it's a Discover although It is out of range
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}
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}
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if (ret == 0)
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{
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// If there is any entry with the same MAC address
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// that are already registered, use it with priority
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DHCP_LEASE *d = SearchDhcpLeaseByMac(v, mac);
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if (d != NULL)
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{
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// Examine whether the found IP address is in the allocation region
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if (Endian32(v->DhcpIpStart) > Endian32(d->IpAddress) ||
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Endian32(d->IpAddress) > Endian32(v->DhcpIpEnd))
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{
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// Use the IP address if it's found within the range
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ret = d->IpAddress;
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}
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}
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}
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if (ret == 0)
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{
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// For static IP, the requested IP address must NOT be within the range of the DHCP pool
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if (Endian32(v->DhcpIpStart) > Endian32(request_ip) ||
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Endian32(request_ip) > Endian32(v->DhcpIpEnd))
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{
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ret = request_ip;
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// The specified IP address is not available for use
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}
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}
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@ -9595,6 +9568,11 @@ void VirtualDhcpServer(VH *v, PKT *p)
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{
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ip = ServeDhcpRequestEx(v, p->MacAddressSrc, opt->RequestedIp, ip_static);
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}
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// If the IP address in user's note is changed, then reply to DHCP_REQUEST with DHCP_NAK
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if (p->L3.IPv4Header->SrcIP && ip != p->L3.IPv4Header->SrcIP)
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{
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ip = 0;
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}
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}
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if (ip != 0 || opt->Opcode == DHCP_INFORM)
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@ -9607,6 +9585,14 @@ void VirtualDhcpServer(VH *v, PKT *p)
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char client_mac[MAX_SIZE];
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char client_ip[MAX_SIZE];
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// If there is any entry with the same MAC address, then remove it
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d = SearchDhcpLeaseByMac(v, p->MacAddressSrc);
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if (d != NULL)
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{
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FreeDhcpLease(d);
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Delete(v->DhcpLeaseList, d);
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}
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// Remove old records with the same IP address
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d = SearchDhcpLeaseByIp(v, ip);
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if (d != NULL)
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@ -9765,7 +9751,7 @@ void VirtualDhcpServer(VH *v, PKT *p)
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}
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else
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{
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// Reply of DHCP_REQUEST must be either DHCP_ACK or DHCP_NAK.
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// Reply of DHCP_REQUEST must be either DHCP_ACK or DHCP_NAK
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if (opt->Opcode == DHCP_REQUEST)
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{
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// There is no IP address that can be provided
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