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@ -9340,20 +9340,75 @@ UINT ServeDhcpDiscoverEx(VH *v, UCHAR *mac, UINT request_ip, bool is_static_ip)
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return 0;
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}
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UINT ret = 0;
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DHCP_LEASE *d = SearchDhcpLeaseByIp(v, request_ip);
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if (d != NULL)
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{
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// The requested IP address is used already
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return 0;
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// If an entry for the same IP address already exists,
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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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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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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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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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}
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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(request_ip) < Endian32(v->DhcpIpStart) || Endian32(request_ip) > Endian32(v->DhcpIpEnd))
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else
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{
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return request_ip;
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// Examine whether the specified IP address is within the range of 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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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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}
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}
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return 0;
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return ret;
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}
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// Take an appropriate IP addresses that can be assigned newly
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@ -9710,36 +9765,40 @@ void VirtualDhcpServer(VH *v, PKT *p)
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}
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else
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{
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// There is no IP address that can be provided
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DHCP_OPTION_LIST ret;
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LIST *o;
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Zero(&ret, sizeof(ret));
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ret.Opcode = DHCP_NACK;
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ret.ServerAddress = v->HostIP;
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StrCpy(ret.DomainName, sizeof(ret.DomainName), v->DhcpDomain);
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ret.SubnetMask = v->DhcpMask;
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// Build the DHCP option
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o = BuildDhcpOption(&ret);
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if (o != NULL)
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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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BUF *b = BuildDhcpOptionsBuf(o);
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if (b != NULL)
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{
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UINT dest_ip = p->L3.IPv4Header->SrcIP;
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if (dest_ip == 0)
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{
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dest_ip = 0xffffffff;
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}
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// Transmission
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VirtualDhcpSend(v, tran_id, dest_ip, Endian16(p->L4.UDPHeader->SrcPort),
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ip, dhcp->ClientMacAddress, b, dhcp->HardwareType, dhcp->HardwareAddressSize);
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// There is no IP address that can be provided
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DHCP_OPTION_LIST ret;
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LIST *o;
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Zero(&ret, sizeof(ret));
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// Release the memory
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FreeBuf(b);
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ret.Opcode = DHCP_NACK;
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ret.ServerAddress = v->HostIP;
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StrCpy(ret.DomainName, sizeof(ret.DomainName), v->DhcpDomain);
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ret.SubnetMask = v->DhcpMask;
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// Build the DHCP option
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o = BuildDhcpOption(&ret);
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if (o != NULL)
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{
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BUF *b = BuildDhcpOptionsBuf(o);
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if (b != NULL)
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{
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UINT dest_ip = p->L3.IPv4Header->SrcIP;
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if (dest_ip == 0)
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{
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dest_ip = 0xffffffff;
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}
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// Transmission
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VirtualDhcpSend(v, tran_id, dest_ip, Endian16(p->L4.UDPHeader->SrcPort),
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ip, dhcp->ClientMacAddress, b, dhcp->HardwareType, dhcp->HardwareAddressSize);
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// Release the memory
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FreeBuf(b);
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}
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FreeDhcpOptions(o);
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}
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FreeDhcpOptions(o);
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}
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}
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}
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