/*****************************************************************************
Function:
int sendto(SOCKET s, const char* buf, int len, int flags, const struct sockaddr* to, int tolen)
Summary:
This function used to send the data for both connection oriented and connection-less
sockets.
Description:
The sendto function is used to send outgoing data on a socket.
The destination address is given by to and tolen. Both
Datagram and stream sockets are supported.
Precondition:
socket function should be called.
Parameters:
s - Socket descriptor returned from a previous call to socket.
buf - application data buffer containing data to transmit.
len - length of data in bytes.
flags - message flags. Currently this field is not supported.
to - Optional pointer to the the sockaddr structure containing the
destination address. If NULL, the currently bound remote port and IP
address are used as the destination.
tolen - length of the sockaddr structure.
Returns:
On success, sendto returns number of bytes sent. In case of
error returns SOCKET_ERROR (and errno set accordingly).
Remarks:
None.
***************************************************************************/
int sendto( SOCKET s, const char* buf, int len, int flags, const struct sockaddr* to, int tolen )
{
struct BSDSocket *socket;
UDP_SOCKET_DCPT* udpSkt;
int size = SOCKET_ERROR;
NODE_INFO remoteInfo;
uint16_t wRemotePort;
struct sockaddr_in local;
if( s >= BSD_SOCKET_COUNT )
{
errno = EBADF;
return SOCKET_ERROR;
}
socket = &BSDSocketArray[s];
if(socket->bsdState == SKT_CLOSED)
{
errno = EBADF;
return SOCKET_ERROR;
}
if(socket->SocketType == SOCK_DGRAM) //UDP
{
// Decide the destination IP address and port
remoteInfo.IPAddr.Val = socket->remoteIP;
wRemotePort = socket->remotePort;
if(to)
{
if((unsigned int)tolen != sizeof(struct sockaddr_in))
{
errno = EFAULT;
return SOCKET_ERROR;
}
wRemotePort = ((struct sockaddr_in*)to)->sin_port;
remoteInfo.IPAddr.Val = ((struct sockaddr_in*)to)->sin_addr.s_addr;
// Implicitly bind the socket if it isn't already
if(socket->bsdState == SKT_CREATED)
{
memset(&local, 0x00, sizeof(local));
if(bind(s, (struct sockaddr*)&local, sizeof(local)) == SOCKET_ERROR)
return SOCKET_ERROR;
}
}
if(remoteInfo.IPAddr.Val == IP_ADDR_ANY)
remoteInfo.IPAddr.Val = 0xFFFFFFFFu;
// Set the remote IP and MAC address if it is different from what we already have stored in the UDP socket
udpSkt = UDPSocketDcpt + socket->SocketID;
if(TCPIP_IPV4_GetDestAddress(udpSkt->pTxPkt).Val != remoteInfo.IPAddr.Val)
{
TCPIP_IPV4_SetDestAddress(udpSkt->pTxPkt, remoteInfo.IPAddr.Val);
if(!ARPIsResolved(UDPSocketGetNet(socket->SocketID), &remoteInfo.IPAddr, &((IPV4_PACKET*)udpSkt->pTxPkt)->remoteMACAddr))
{
errno = EINPROGRESS;
return SOCKET_ERROR;
}
}
// Select the UDP socket and see if we can write to it
if(UDPIsTxPutReady(socket->SocketID, len))
{
// Set the proper remote port
udpSkt->remotePort = wRemotePort;
// Write data and send UDP datagram
size = UDPPutArray(socket->SocketID, (uint8_t*)buf, len);
UDPFlush(socket->SocketID);
return size;
}
}
else if(socket->SocketType == SOCK_STREAM) //TCP will only send to the already established socket.
{
if(socket->bsdState != SKT_EST)
{
errno = ENOTCONN;
return SOCKET_ERROR;
}
if(HandlePossibleTCPDisconnection(s))
{
errno = ECONNRESET;
return SOCKET_ERROR;
}
// Handle special case were 0 return value is okay
if(len == 0)
return 0;
// Write data to the socket. If one or more bytes were written, then
// return this value. Otherwise, fail and return SOCKET_ERROR.
size = TCPPutArray(socket->SocketID, (uint8_t*)buf, len);
if(size)
return size;
}
errno = EWOULDBLOCK;
return SOCKET_ERROR;
}
/*********************************************************************
* Function: void ANNOUNCE_Task(void)
*
* Summary: Announce callback task.
*
* PreCondition: Stack is initialized()
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Recurring task used to listen for Discovery
* messages on the specified ANNOUNCE_PORT. These
* messages can be sent using the TCP/IP
* Discoverer tool. If one is received, this
* function will transmit a reply.
*
* Note: A UDP socket must be available before this
* function is called. It is freed at the end of
* the function. UDP_MAX_SOCKETS may need to be
* increased if other modules use UDP sockets.
********************************************************************/
void ANNOUNCE_Task(NET_CONFIG * pNetIf)
{
static enum {
DISCOVERY_HOME = 0,
DISCOVERY_LISTEN,
DISCOVERY_REQUEST_RECEIVED,
DISCOVERY_DISABLED
} DiscoverySM[TCPIP_NETWORK_INTERFACES] = {DISCOVERY_HOME};
static UDP_SOCKET MySocket[TCPIP_NETWORK_INTERFACES];
uint8_t i;
int netIx;
UDP_SOCKET s;
if(!pNetIf)
{
return;
}
else
{
netIx = _TCPIPStackNetIx(pNetIf);
}
s = MySocket[netIx];
switch(DiscoverySM[netIx])
{
case DISCOVERY_HOME:
// Open a UDP socket for inbound and outbound transmission
// Since we expect to only receive broadcast packets and
// only send unicast packets directly to the node we last
// received from, the remote NodeInfo parameter can be anything
MySocket[netIx] = UDPOpen(0,UDP_OPEN_SERVER,ANNOUNCE_PORT, ANNOUNCE_PORT);
if(MySocket[netIx] == INVALID_UDP_SOCKET)
{
return;
}
else
{
DiscoverySM[netIx]++;
UDPSocketSetNet(MySocket[netIx], pNetIf);
}
break;
case DISCOVERY_LISTEN:
// Do nothing if no data is waiting
if(!UDPIsGetReady(s))
return;
// See if this is a discovery query or reply
UDPGet(s, &i);
UDPDiscard(s);
if(i != 'D')
return;
// We received a discovery request, reply when we can
DiscoverySM[netIx]++;
// Change the destination to the unicast address of the last received packet
TCPIP_IPV4_SetDestAddress(UDPSocketDcpt[s].pTxPkt,remoteNode.IPAddr.Val);
memcpy((void*)&UDPSocketDcpt[s].pTxPkt->remoteMACAddr, (const void*)&remoteNode.MACAddr, sizeof(MAC_ADDR));
// No break needed. If we get down here, we are now ready for the DISCOVERY_REQUEST_RECEIVED state
case DISCOVERY_REQUEST_RECEIVED:
ANNOUNCE_Notify (pNetIf, 0, NULL);
// Listen for other discovery requests
DiscoverySM[netIx] = DISCOVERY_LISTEN;
break;
case DISCOVERY_DISABLED:
break;
}
}
/*********************************************************************
* Function: void NBNSTask(NET_CONFIG* pConfig)
*
* PreCondition: None
*
* Input: pConfig - interface
*
* Output: None
*
* Side Effects: None
*
* Overview: Sends responses to NetBIOS name requests
*
* Note: None
********************************************************************/
void NBNSTask(NET_CONFIG* pConfig)
{
uint8_t i;
TCPIP_UINT16_VAL Type, Class;
NBNS_HEADER NBNSHeader;
uint8_t NameString[16];
int netIx;
UDP_SOCKET s;
netIx = _TCPIPStackNetIx(pConfig);
s = MySocket[netIx];
switch(smNBNS[netIx])
{
case NBNS_HOME:
smNBNS[netIx]++;
break;
case NBNS_OPEN_SOCKET:
MySocket[netIx] = UDPOpen(0,UDP_OPEN_SERVER,NBNS_PORT,NBNS_PORT);
if(MySocket[netIx] == INVALID_UDP_SOCKET)
break;
UDPSocketSetNet(MySocket[netIx], pConfig);
smNBNS[netIx]++;
case NBNS_LISTEN:
if(!UDPIsGetReady(s))
{
break;
}
// Respond only to name requests sent to us from nodes on the same subnet
// This prevents us from sending out the wrong IP address information if
// we haven't gotten a DHCP lease yet.
if((remoteNode.IPAddr.Val & pConfig->MyMask.Val) != (pConfig->MyIPAddr.Val & pConfig->MyMask.Val))
{
UDPDiscard(s);
break;
}
// Retrieve the NBNS header and de-big-endian it
UDPGet(s, &NBNSHeader.TransactionID.v[1]);
UDPGet(s, &NBNSHeader.TransactionID.v[0]);
UDPGet(s, &NBNSHeader.Flags.v[1]);
UDPGet(s, &NBNSHeader.Flags.v[0]);
UDPGet(s, &NBNSHeader.Questions.v[1]);
UDPGet(s, &NBNSHeader.Questions.v[0]);
UDPGet(s, &NBNSHeader.Answers.v[1]);
UDPGet(s, &NBNSHeader.Answers.v[0]);
UDPGet(s, &NBNSHeader.AuthoritativeRecords.v[1]);
UDPGet(s, &NBNSHeader.AuthoritativeRecords.v[0]);
UDPGet(s, &NBNSHeader.AdditionalRecords.v[1]);
UDPGet(s, &NBNSHeader.AdditionalRecords.v[0]);
// Remove all questions
while(NBNSHeader.Questions.Val--)
{
NBNSGetName(s, NameString);
UDPGet(s, &i); // <??> Trailing character on string
UDPGet(s, &Type.v[1]); // Question type
UDPGet(s, &Type.v[0]);
UDPGet(s, &Class.v[1]); // Question class
UDPGet(s, &Class.v[0]);
if(Type.Val == 0x0020u && Class.Val == 0x0001u && memcmp((void*)NameString, (void*)pConfig->NetBIOSName, sizeof(pConfig->NetBIOSName)) == 0)
{
if(UDPIsTxPutReady(s, 64))
{
NBNSHeader.Flags.Val = 0x8400;
UDPPut(s, NBNSHeader.TransactionID.v[1]);
UDPPut(s, NBNSHeader.TransactionID.v[0]);
UDPPut(s, NBNSHeader.Flags.v[1]);
UDPPut(s, NBNSHeader.Flags.v[0]);
UDPPut(s, 0x00); // 0x0000 Questions
UDPPut(s, 0x00);
UDPPut(s, 0x00); // 0x0001 Answers
UDPPut(s, 0x01);
UDPPut(s, 0x00); // 0x0000 Athoritative records
UDPPut(s, 0x00);
UDPPut(s, 0x00); // 0x0000 Additional records
UDPPut(s, 0x00);
NBNSPutName(s, pConfig->NetBIOSName);
UDPPut(s, 0x00); // 0x0020 Type: NetBIOS
UDPPut(s, 0x20);
UDPPut(s, 0x00); // 0x0001 Class: Internet
UDPPut(s, 0x01);
UDPPut(s, 0x00); // 0x00000000 Time To Live
UDPPut(s, 0x00);
UDPPut(s, 0x00);
UDPPut(s, 0x00);
UDPPut(s, 0x00); // 0x0006 Data length
UDPPut(s, 0x06);
UDPPut(s, 0x60); // 0x6000 Flags: H-node, Unique
UDPPut(s, 0x00);
UDPPut(s, pConfig->MyIPAddr.v[0]); // Put out IP address
UDPPut(s, pConfig->MyIPAddr.v[1]);
UDPPut(s, pConfig->MyIPAddr.v[2]);
UDPPut(s, pConfig->MyIPAddr.v[3]);
// Change the destination address to the unicast address of the last received packet
TCPIP_IPV4_SetDestAddress(UDPSocketDcpt[s].pTxPkt,remoteNode.IPAddr.Val);
memcpy((void*)&UDPSocketDcpt[s].pTxPkt->remoteMACAddr, (const void*)&remoteNode.MACAddr, sizeof(remoteNode.MACAddr));
UDPFlush(s);
}
}
}
UDPDiscard(s);
break;
}
}
