diff options
Diffstat (limited to 'Projects/Webserver/Lib/DHCPServerApp.c')
| -rw-r--r-- | Projects/Webserver/Lib/DHCPServerApp.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/Projects/Webserver/Lib/DHCPServerApp.c b/Projects/Webserver/Lib/DHCPServerApp.c index 43d539f7a..fadb9e828 100644 --- a/Projects/Webserver/Lib/DHCPServerApp.c +++ b/Projects/Webserver/Lib/DHCPServerApp.c @@ -42,20 +42,20 @@ 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)); /* 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)); } @@ -88,8 +88,8 @@ void DHCPServerApp_Callback(void) /* 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: @@ -116,7 +116,7 @@ void DHCPServerApp_Callback(void) /* 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 */ @@ -133,12 +133,12 @@ void DHCPServerApp_Callback(void) /* 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 */ @@ -179,7 +179,7 @@ static uint16_t DHCPServerApp_FillDHCPHeader(DHCP_Header_t* const DHCPHeader, 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; @@ -202,7 +202,7 @@ 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; @@ -217,13 +217,13 @@ static bool DHCPServerApp_CheckIfIPLeased(const uip_ipaddr_t* const IPAddress) 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; @@ -241,7 +241,7 @@ static void DHCPServerApp_LeaseIP(const uip_ipaddr_t* const IPAddress) { 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; } @@ -257,7 +257,7 @@ static void DHCPServerApp_UnleaseIP(const uip_ipaddr_t* const IPAddress) { 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; } |