BrychanD/Simple-DHCP-Server
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Created a C++ port of the C# project. Needs some tidying

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BrychanD
2021-01-07 00:03:30 +13:00
parent 5bb94e798a
commit a1fbe62327
5 changed files with 739 additions and 15 deletions
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Simple DHCP Server/Program.cs
+7 -14
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@@ -21,7 +21,7 @@ namespace Simple_DHCP_Server
static byte localAddress2 = 168;
static byte localAddress3 = 250;
static byte deviceIP = 1;
// Starting address for leases
static byte leaseStart = 2;
// Local Subnet Address
@@ -127,13 +127,8 @@ namespace Simple_DHCP_Server
MACAddress clientMAC = new MACAddress(rxBuffer[28..34]); // take the range of values from 28 (inclusive) to 34 (exclusive) i.e. 6 bytes of MAC address
// Find if the item already exists, and/or determine its IP now
byte leaseIndex = FindPosByMac(clientMAC, DHCPEntries, maxLeases);
byte clientIP = 0;
if (leaseIndex < 255)
{
// If found, use the client's assigned IP address
clientIP =(byte)(leaseIndex + leaseStart);
}
else
byte clientIP;
if (leaseIndex == 255)
{
// Not found; search for the next empty MAC and assign
leaseIndex = FindPosByMac(MACAddress.Empty, DHCPEntries, maxLeases);
@@ -141,8 +136,8 @@ namespace Simple_DHCP_Server
{
return null;
}
clientIP = (byte)(leaseIndex + leaseStart);
}
clientIP = (byte)(leaseIndex + leaseStart);
// The same basic packet structure occurs to all responses:
// In context, we're always responding
txBuffer[0] = 2;
@@ -272,10 +267,10 @@ namespace Simple_DHCP_Server
else if (option.option == 55)
{
// Parameter request list
DHCPEntries[clientIP-2].requestedItems = new byte[option.dataLength];
DHCPEntries[clientIP-leaseStart].requestedItems = new byte[option.dataLength];
for (int i = 0; i < option.dataLength; i++)
{
DHCPEntries[clientIP - 2].requestedItems[i] = option.DHCPData[i];
DHCPEntries[clientIP - leaseStart].requestedItems[i] = option.DHCPData[i];
}
}
}
@@ -374,7 +369,6 @@ namespace Simple_DHCP_Server
/// <returns></returns>
public static uint millis()
{
TimeSpan elapsed = DateTime.Now.Subtract(Process.GetCurrentProcess().StartTime);
return (uint)(GetTickCount64() % uint.MaxValue);
}
@@ -471,7 +465,6 @@ namespace Simple_DHCP_Server
s.Add((byte)(DNSServers[i] >> 8));
s.Add((byte)DNSServers[i]);
length += 4;
}
}
}
@@ -488,7 +481,7 @@ namespace Simple_DHCP_Server
else
{
// As the time stored in DHCPEntries is in seconds, subtracting the current millis() in seconds
time = DHCPEntries[clientIP - 2].expiry - (millis()/1000);
time = DHCPEntries[clientIP - leaseStart].expiry - (millis()/1000);
}
s.Add((byte)(time >> 24));
s.Add((byte)(time >> 16));