/*
LUFA Library
- Copyright (C) Dean Camera, 2011.
+ Copyright (C) Dean Camera, 2019.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
- Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2019 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
- The author disclaim all warranties with regard to this
+ The author disclaims all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
this software.
*/
-#if defined(ENABLE_DHCP_SERVER) || defined(__DOXYGEN__)
-
/** \file
*
* DHCP Server Application. When connected to the uIP stack, this will send IP configuration settings to a
#define INCLUDE_FROM_DHCPSERVERAPP_C
#include "DHCPServerApp.h"
+#if defined(ENABLE_DHCP_SERVER) || defined(__DOXYGEN__)
+
struct uip_conn* BroadcastConnection;
uint8_t LeasedIPs[255 / 8];
-
+
/** Initialization function for the DHCP server. */
void DHCPServerApp_Init(void)
{
/* Listen on port 67 for DHCP server connections from hosts */
uip_listen(HTONS(DHCP_SERVER_PORT));
-
+
/* Create a new UDP connection to the DHCP server port for the DHCP solicitation */
- struct uip_udp_conn* BroadcastConnection = uip_udp_new(&uip_broadcast_addr, HTONS(DHCP_CLIENT_PORT));
+ BroadcastConnection = uip_udp_new(&uip_broadcast_addr, HTONS(DHCP_CLIENT_PORT));
/* If the connection was successfully created, bind it to the local DHCP client port */
if (BroadcastConnection != NULL)
uip_udp_bind(BroadcastConnection, HTONS(DHCP_SERVER_PORT));
-
+
/* Set all IP addresses as unleased */
memset(LeasedIPs, 0x00, sizeof(LeasedIPs));
}
/* Try to extract out the client's preferred IP address if it is indicated in the packet */
if (!(DHCPCommon_GetOption(AppData->Options, DHCP_OPTION_REQ_IPADDR, &PreferredClientIP)))
- memcpy(&PreferredClientIP, &uip_all_zeroes_addr, sizeof(uip_ipaddr_t));
-
+ memcpy(&PreferredClientIP, &uip_all_zeroes_addr, sizeof(uip_ipaddr_t));
+
switch (DHCPMessageType)
{
case DHCP_DISCOVER:
/* Check to see if the requested IP address has already been leased to a client */
if (!(DHCPServerApp_CheckIfIPLeased(&PreferredClientIP)))
{
- /* Create a new DHCP ACK packet to accept the IP address lease */
+ /* Create a new DHCP ACK packet to accept the IP address lease */
AppDataSize += DHCPServerApp_FillDHCPHeader(AppData, DHCP_ACK, &RemoteMACAddress, &PreferredClientIP, TransactionID);
/* Add network mask and router information to the list of DHCP ACK packet options */
/* Create a new DHCP NAK packet to reject the requested allocation */
AppDataSize += DHCPServerApp_FillDHCPHeader(AppData, DHCP_NAK, &RemoteMACAddress, &uip_all_zeroes_addr, TransactionID);
}
-
+
/* Send the DHCP ACK or NAK packet */
uip_poll_conn(BroadcastConnection);
memcpy(&uip_udp_conn->ripaddr, &uip_broadcast_addr, sizeof(uip_ipaddr_t));
uip_udp_send(AppDataSize);
-
+
break;
case DHCP_RELEASE:
/* Mark the IP address as released in the allocation table */
memcpy(&DHCPHeader->YourIP, PreferredClientIP, sizeof(uip_ipaddr_t));
memcpy(&DHCPHeader->ClientHardwareAddress, ClientHardwareAddress, sizeof(struct uip_eth_addr));
DHCPHeader->Cookie = DHCP_MAGIC_COOKIE;
-
+
/* Add a DHCP message type and terminator options to the start of the DHCP options field */
DHCPHeader->Options[0] = DHCP_OPTION_MSG_TYPE;
DHCPHeader->Options[1] = 1;
*
* \pre The IP address must be within the same /24 subnet as the virtual webserver.
*
- * \return Boolean true if the IP has already been leased to a client, false otherwise.
+ * \return Boolean \c true if the IP has already been leased to a client, \c false otherwise.
*/
static bool DHCPServerApp_CheckIfIPLeased(const uip_ipaddr_t* const IPAddress)
{
uint8_t Byte = (IPAddress->u8[3] / 8);
uint8_t Mask = (1 << (IPAddress->u8[3] % 8));
-
+
/* Make sure that the requested IP address isn't already leased to the virtual server or another client */
if (IPAddress->u8[3] && !(IPAddress->u8[3] == uip_hostaddr.u8[3]) && !(LeasedIPs[Byte] & Mask))
return false;
static void DHCPServerApp_GetUnleasedIP(uip_ipaddr_t* const NewIPAddress)
{
uip_ipaddr_copy(NewIPAddress, &uip_hostaddr);
-
+
/** Look through the current subnet, skipping the broadcast and zero IP addresses */
for (uint8_t IP = 1; IP < 254; IP++)
{
/* Update new IP address to lease with the current IP address to test */
NewIPAddress->u8[3] = IP;
-
+
/* If we've found an unleased IP, abort with the updated IP stored for the called */
if (!(DHCPServerApp_CheckIfIPLeased(NewIPAddress)))
return;
{
uint8_t Byte = (IPAddress->u8[3] / 8);
uint8_t Mask = (1 << (IPAddress->u8[3] % 8));
-
+
/* Mark the IP address as leased in the allocation table */
LeasedIPs[Byte] |= Mask;
}
{
uint8_t Byte = (IPAddress->u8[3] / 8);
uint8_t Mask = (1 << (IPAddress->u8[3] % 8));
-
+
/* Mark the IP address as unleased in the allocation table */
LeasedIPs[Byte] &= ~Mask;
}
projects / pub / lufa.git / blobdiff