/*******************************************************************************
* Function Name: SendPing
********************************************************************************
* Summary:
* Generate and send a Ping request to an IP specified by targetIP
*
* Parameters:
* targetIP - IP Address to which the ping request will be directed.
* example: unsigned char LabPC_IP[]={192,168,1,15}; then
* ..
* SendPing(LabPC_IP);
* Returns:
* TRUE(0)- if the Ping request was successfully sent.
* FALSE(1) - if the Ping request was not successful in transmission.
*******************************************************************************/
unsigned int SendPing( unsigned char* targetIP ){
unsigned int i;
/*declare an ICMP header for our ping request packet*/
ICMPhdr ping;
/*Setup the IP header part of it*/
SetupBasicIPPacket( (unsigned char*)&ping, ICMPPROTOCOL, targetIP );
/*Setup the Ping flags*/
ping.ip.flags = 0x0;
ping.type = 0x8;
ping.codex = 0x0;
ping.chksum = 0x0;
ping.iden = (0x1);
ping.seqNum = (76);
/*Fill in the dummy data*/
for(i=0;i<18;i++){
*((unsigned char*)&ping+sizeof(ICMPhdr)+i)='A'+i;
}
/*Write the length field*/
ping.ip.len = (60-sizeof(EtherNetII));
/*Compute the checksums*/
ping.chksum=checksum(((unsigned char*)&ping) + sizeof(IPhdr ),(sizeof(ICMPhdr) - sizeof(IPhdr))+18,0);
ping.ip.chksum = checksum(((unsigned char*)&ping) + sizeof(EtherNetII),sizeof(IPhdr) - sizeof(EtherNetII),0);
/*Send it!*/
return(MACWrite( (unsigned char*)&ping, sizeof(ICMPhdr)+18 ));
}
/*******************************************************************************
* Function Name: ReplyTCP_Webserver
********************************************************************************
* Summary:
* This is used to send the webpage generated by AddWebServerData,in response
* to the GET query.This function ACK's the GET query,and then sends the reply.
*
* Parameters:
* TCPPkt - pointer to a TCP packet that has the Webpage.
* len - length of this packet.
* Returns:
* TRUE(0)- if the packet was successfully sent.
* FALSE(1) - if the packet was not successful in transmission.
*******************************************************************************/
unsigned int ReplyTCP_Webserver(TCPhdr* TCPPkt,unsigned int datlen){
/*Send an ACK for the GET query*/
ackTcp(TCPPkt,(TCPPkt->ip.len)+14,0,0,0,0);
/*Based on that ACK we sent,create the reply to the GET query*/
/*Set the flags.*/
TCPPkt->ACK=1;
TCPPkt->PSH=1;
TCPPkt->FIN=1;
/*Set the length field*/
TCPPkt->ip.len=(sizeof(TCPhdr)+datlen)-sizeof(EtherNetII);
/*Zero out and then compute IP checksum*/
TCPPkt->ip.chksum=0x00;
TCPPkt->ip.chksum=checksum((unsigned char*)TCPPkt + sizeof(EtherNetII),sizeof(IPhdr)-sizeof(EtherNetII),0);
/*Zero out and then compute TCP checksum*/
TCPPkt->chksum=0x00;
TCPPkt->chksum=checksum((unsigned char*)TCPPkt->ip.source,0x08+0x14+datlen,2);
/*Send the reply*/
return(MACWrite((unsigned char*)TCPPkt,sizeof(TCPhdr)+datlen));
}
/*******************************************************************************
* Function Name: PingReply
********************************************************************************
* Summary:
* Generate and send a Ping reply from a received request.
*
* Parameters:
* ping - A pointer of type ICMPhdr,to the received request's packet.
* len - length of the recd. Ping request.
* Returns:
* TRUE(0)- if the Ping Reply was successfully sent.
* FALSE(1) - if the Ping Reply was not successful in transmission.
*******************************************************************************/
unsigned int PingReply(ICMPhdr* ping,unsigned int len){
if ( ping->type == ICMPREQUEST ){
/*Yes,it is a Request,lets reply.*/
/*Setup the packet as a reply*/
ping->type = ICMPREPLY;
ping->chksum = 0x0;
ping->ip.chksum = 0x0;
/*Swap the MAC Addresses in the ETH header*/
memcpy( ping->ip.eth.DestAddrs, ping->ip.eth.SrcAddrs, 6);
memcpy( ping->ip.eth.SrcAddrs, deviceMAC,6 );
/*Swap the IP Addresses in the IP header*/
memcpy( ping->ip.dest, ping->ip.source,4);
memcpy( ping->ip.source, deviceIP,4);
/*Compute the checksums*/
ping->chksum=checksum(((unsigned char*) ping) + sizeof(IPhdr ),len - sizeof(IPhdr),0);
ping->ip.chksum = checksum(((unsigned char*) ping) + sizeof(EtherNetII),sizeof(IPhdr) - sizeof(EtherNetII),0);
/*Send it!*/
return(MACWrite((unsigned char*) ping, len));
}
return FALSE;
}
void SendArpPacket(unsigned char* targetIP)
{
ARP arpPacket;
/*----Setup EtherNetII Header----*/
//The source of the packet will be the device mac address.
memcpy( arpPacket.eth.SrcAddrs, deviceMAC, sizeof(deviceMAC) );
//The destination is broadcast ie all bits are 0xff.
memset( arpPacket.eth.DestAddrs, 0xff, sizeof(deviceMAC) );
//The type of packet being sent is an ARP
arpPacket.eth.type = HTONS(ARPPACKET);
/*----Setup ARP Header----*/
arpPacket.hardware = HTONS(ETHERNET);
//We are wanting IP address resolved.
arpPacket.protocol = HTONS(IPPACKET);
arpPacket.hardwareSize = sizeof(deviceMAC);
arpPacket.protocolSize = sizeof(deviceIP);
arpPacket.opCode = HTONS(ARPREQUEST);
//Target MAC is set to 0 as it is unknown.
memset( arpPacket.targetMAC, 0, sizeof(deviceMAC) );
//Sender MAC is the device MAC address.
memcpy( arpPacket.senderMAC, deviceMAC, sizeof(deviceMAC) );
//The target IP is the IP address we want resolved.
memcpy( arpPacket.targetIP, targetIP, sizeof(routerIP));
//If we are just making sure this IP address is not in use fill in the
//sender IP address as 0. Otherwise use the device IP address.
if ( !memcmp( targetIP, deviceIP, sizeof(deviceIP) ) )
{
memset( arpPacket.senderIP, 0, sizeof(deviceIP) );
}
else
{
memcpy( arpPacket.senderIP, deviceIP, sizeof(deviceIP) );
}
//Send out the packet.
MACWrite((unsigned char*)&arpPacket,sizeof(ARP));
}
