Diff: if/lwip/lwipNetUdpSocket.cpp

Revision:

0:ac21159e27f4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/if/lwip/lwipNetUdpSocket.cpp	Fri Jul 02 17:21:58 2010 +0000
@@ -0,0 +1,239 @@
+
+/*
+Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
+ 
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+ 
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+ 
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#include "lwipNetUdpSocket.h"
+#include "lwip/udp.h"
+
+//#define __DEBUG
+#include "dbg/dbg.h"
+
+#include "netCfg.h"
+#if NET_LWIP_STACK
+
+LwipNetUdpSocket::LwipNetUdpSocket(udp_pcb* pPcb /*= NULL*/) : NetUdpSocket(), m_pPcb(pPcb), m_lInPkt() //Passes a pcb if already created (by an accept req for instance), in that case transfers ownership
+{
+  DBG("\r\nNew LwipNetUdpSocket %p (pPCb=%p)\r\n", (void*)this, (void*) pPcb);
+  if(!m_pPcb)
+    m_pPcb = udp_new();
+  if(m_pPcb)
+  {
+    //Setup callback
+    udp_recv( (udp_pcb*) m_pPcb, LwipNetUdpSocket::sRecvCb, (void*) this );
+  }
+}
+
+LwipNetUdpSocket::~LwipNetUdpSocket()
+{
+  close();
+}
+  
+NetUdpSocketErr LwipNetUdpSocket::bind(const Host& me)
+{
+  if(!m_pPcb)
+    return NETUDPSOCKET_MEM; //NetUdpSocket was not properly initialised, should destroy it & retry
+
+  err_t err = udp_bind( (udp_pcb*) m_pPcb, IP_ADDR_ANY, me.getPort()); //IP_ADDR_ANY : Bind the connection to all local addresses
+  if(err)
+    return NETUDPSOCKET_INUSE;
+
+  //Setup callback
+  udp_recv( (udp_pcb*) m_pPcb, LwipNetUdpSocket::sRecvCb, (void*) this );
+    
+  return NETUDPSOCKET_OK;
+}
+
+#define MAX(a,b) ((a>b)?a:b)
+#define MIN(a,b) ((a<b)?a:b)
+
+int /*if < 0 : NetUdpSocketErr*/ LwipNetUdpSocket::sendto(const char* buf, int len, Host* pHost)
+{
+  if( !m_pPcb ) //Pcb doesn't exist (anymore)
+    return NETUDPSOCKET_MEM;
+  pbuf* p = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_POOL);
+  if( !p )
+    return NETUDPSOCKET_MEM;
+  char* pBuf = (char*) buf;
+  pbuf* q = p; 
+  do
+  {
+    memcpy (q->payload, (void*)pBuf, q->len);  
+    pBuf += q->len;
+    q = q->next;
+  } while(q != NULL);
+
+  err_t err = udp_sendto( (udp_pcb*) m_pPcb, p, &(pHost->getIp().getStruct()), pHost->getPort() );
+  pbuf_free( p );
+  if(err)
+    return NETUDPSOCKET_SETUP; //Connection problem
+  DBG("\r\n%d bytes sent in UDP Socket.\r\n", len);
+  return len;
+}
+
+int /*if < 0 : NetUdpSocketErr*/ LwipNetUdpSocket::recvfrom(char* buf, int len, Host* pHost)
+{
+  if( !m_pPcb ) //Pcb doesn't exist (anymore)
+    return NETUDPSOCKET_MEM;
+  int inLen = 0;
+  int cpyLen = 0;
+  
+  static int rmgLen = 0; 
+  //Contains the remaining len in this pbuf
+  
+  if( m_lInPkt.empty() )
+    return 0;
+    
+  pbuf* pBuf = (pbuf*) m_lInPkt.front().pBuf;
+  
+  if(pHost)
+    *pHost = Host( IpAddr(&m_lInPkt.front().addr), m_lInPkt.front().port );
+  
+  if( !pBuf )
+  {
+    rmgLen = 0;
+    return 0;
+  }
+  
+  if ( !rmgLen ) //We did not know m_pReadPbuf->len last time we called this fn
+  {
+    rmgLen = pBuf->len;
+  }
+  
+  while ( inLen < len )
+  {
+    cpyLen = MIN( (len - inLen), rmgLen ); //Remaining len to copy, remaining len in THIS pbuf
+    memcpy((void*)buf, (void*)((char*)(pBuf->payload) + (pBuf->len - rmgLen)), cpyLen);
+    inLen += cpyLen;
+    buf += cpyLen;
+    
+    rmgLen = rmgLen - cpyLen; //Update rmgLen
+    
+    if( rmgLen > 0 )
+    {
+      //We did not read this pbuf completely, so let's save it's pos & return
+      break;
+    }
+    
+    if(pBuf->next)
+    {
+      pbuf* pNextPBuf = pBuf->next;
+      pBuf->next = NULL; //So that it is not freed as well
+      //We get the reference to pNextPBuf from m_pReadPbuf
+      pbuf_free((pbuf*)pBuf);
+      pBuf = pNextPBuf;
+      rmgLen = pBuf->len;
+    }
+    else
+    {
+      pbuf_free((pbuf*)pBuf);
+      pBuf = NULL;
+      rmgLen = 0;
+      m_lInPkt.pop_front();
+      break; //No more data to read
+    } 
+  }
+  
+  return inLen;
+}
+
+NetUdpSocketErr LwipNetUdpSocket::close()
+{
+  DBG("\r\nLwipNetUdpSocket::close() : Closing...\r\n");
+
+  if(m_closed)
+    return NETUDPSOCKET_OK; //Already being closed
+  m_closed = true;
+  
+  if( !m_pPcb ) //Pcb doesn't exist (anymore)
+    return NETUDPSOCKET_MEM;
+    
+  DBG("\r\nLwipNetUdpSocket::close() : Cleanup...\r\n");
+    
+  //Cleanup incoming data
+  cleanUp();
+ 
+  DBG("\r\nLwipNetUdpSocket::close() : removing m_pPcb...\r\n");
+  udp_remove( (udp_pcb*) m_pPcb);
+    
+  m_pPcb = NULL;
+  return NETUDPSOCKET_OK;
+}
+
+NetUdpSocketErr LwipNetUdpSocket::poll()
+{
+  NetUdpSocket::flushEvents();
+  return NETUDPSOCKET_OK;
+}
+
+// Callbacks events
+
+void LwipNetUdpSocket::recvCb(udp_pcb* pcb, struct pbuf* p, ip_addr_t* addr, u16_t port)
+{
+  DBG("\r\n Packet of length %d arrived in UDP Socket.\r\n", p->tot_len);
+  list<InPacket>::iterator it;
+  for ( it = m_lInPkt.begin(); it != m_lInPkt.end(); it++ )
+  {
+    if( ip_addr_cmp((&((*it).addr)), addr) && ((*it).port == port) )
+    {
+      //Let's tail this packet to the previous one
+      pbuf_cat((pbuf*)((*it).pBuf), p);
+      //No need to queue an event in that case since the read buf has not been processed yet
+      return;
+    }
+  }
+
+  //New host, add a packet to the queue
+  InPacket pkt;
+  pkt.pBuf = p;
+  pkt.addr = *addr;
+  pkt.port = port;
+  m_lInPkt.push_back(pkt);
+  
+  queueEvent(NETUDPSOCKET_READABLE);
+}
+
+void LwipNetUdpSocket::cleanUp() //Flush input buffer
+{
+  //Ensure that further error won't be followed to this inst (which can be destroyed)
+  if( m_pPcb )
+  {
+    udp_recv( (udp_pcb*) m_pPcb, NULL, (void*) NULL );
+  }
+  
+  list<InPacket>::iterator it;
+  for ( it = m_lInPkt.begin(); it != m_lInPkt.end(); it++ )
+  {
+    //Free buf
+    pbuf_free((pbuf*)((*it).pBuf));
+  } 
+  m_lInPkt.clear();
+}
+
+// Static callback from LwIp
+
+void LwipNetUdpSocket::sRecvCb(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
+{
+  LwipNetUdpSocket* pMe = (LwipNetUdpSocket*) arg;
+  return pMe->recvCb( pcb, p, addr, port );
+}
+
+#endif