Multicast socket API

net/udp/udp_socket_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/udp/udp_socket_win.h"
 
 #include <mstcpip.h>
 
 #include "base/callback.h"
 #include "base/logging.h"
@@ skipping 337 matching lines @@
   if (rv < 0)
     return rv;
   rv = DoBind(address);
   if (rv < 0)
     return rv;
   local_address_.reset();
   return rv;
 }
 
 int UDPSocketWin::CreateSocket(const IPEndPoint& address) {
-  socket_ = WSASocket(address.GetSockAddrFamily(), SOCK_DGRAM, IPPROTO_UDP,
+  sock_addr_family_ = address.GetSockAddrFamily();
+  socket_ = WSASocket(sock_addr_family_, SOCK_DGRAM, IPPROTO_UDP,
                       NULL, 0, WSA_FLAG_OVERLAPPED);
   if (socket_ == INVALID_SOCKET)
     return MapSystemError(WSAGetLastError());
   core_ = new Core(this);
   return OK;
 }
 
 bool UDPSocketWin::SetReceiveBufferSize(int32 size) {
   DCHECK(CalledOnValidThread());
   int rv = setsockopt(socket_, SOL_SOCKET, SO_RCVBUF,
@@ skipping 208 matching lines @@
     if (rv < 0)
       return MapSystemError(errno);
   }
   if (socket_options_ & SOCKET_OPTION_BROADCAST) {
     int rv = setsockopt(socket_, SOL_SOCKET, SO_BROADCAST,
                         reinterpret_cast<const char*>(&true_value),
                         sizeof(true_value));
     if (rv < 0)
       return MapSystemError(errno);
   }
+  if (multicast_time_to_live_ != 1) {
+    int rv = SetMulticastTimeToLive(multicast_time_to_live_);
+    if (rv != OK)
+      return rv;
+  }
+  if (!multicast_loopback_mode_) {
+    int rv = SetMulticastLoopbackMode(multicast_loopback_mode_);
+    if (rv != OK)
+      return rv;
+  }
   return OK;
 }
 
 int UDPSocketWin::DoBind(const IPEndPoint& address) {
   SockaddrStorage storage;
   if (!address.ToSockAddr(storage.addr, &storage.addr_len))
     return ERR_UNEXPECTED;
   int rv = bind(socket_, storage.addr, storage.addr_len);
   return rv < 0 ? MapSystemError(WSAGetLastError()) : rv;
 }
@@ skipping 10 matching lines @@
       return rv;
   }
   return DoBind(IPEndPoint(ip, 0));
 }
 
 bool UDPSocketWin::ReceiveAddressToIPEndpoint(IPEndPoint* address) const {
   SockaddrStorage& storage = core_->recv_addr_storage_;
   return address->FromSockAddr(storage.addr, storage.addr_len);
 }
 
+
+int UDPSocketWin::JoinGroup(
+    const net::IPAddressNumber& group_address) const {
+  DCHECK(CalledOnValidThread());
+  DCHECK(is_connected());
+  int rv = -1;
+  switch(group_address.size()) {

[mmenke, 2013/04/12 21:07:41]

Space after switch.

[Bei Zhang, 2013/04/15 22:30:26]

Done.

+    case kIPv4AddressSize: {
+      if (sock_addr_family_ != AF_INET) {
+        return ERR_ADDRESS_INVALID;
+      }
+      ip_mreq mreq;
+      memset(&mreq, 0, sizeof(mreq));
+      memcpy(&mreq.imr_multiaddr, &group_address[0], kIPv4AddressSize);
+      rv = setsockopt(socket_, IPPROTO_IP, IP_ADD_MEMBERSHIP,
+                      reinterpret_cast<const char*>(&mreq),
+                      sizeof(mreq));
+      break;
+    }
+    case kIPv6AddressSize: {
+      if (sock_addr_family_ != AF_INET6) {
+        return ERR_ADDRESS_INVALID;
+      }
+      ipv6_mreq mreq;
+      memset(&mreq, 0, sizeof(mreq));
+      memcpy(&mreq.ipv6mr_multiaddr, &group_address[0], kIPv6AddressSize);
+      rv = setsockopt(socket_, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
+                      reinterpret_cast<const char*>(&mreq),
+                      sizeof(mreq));
+      break;
+    }
+  }
+  return MapSystemError(rv);
+}
+
+int UDPSocketWin::LeaveGroup(
+    const net::IPAddressNumber& group_address) const {
+  DCHECK(CalledOnValidThread());
+  DCHECK(is_connected());
+  int rv = -1;
+  switch(group_address.size()) {
+    case kIPv4AddressSize: {
+      if (sock_addr_family_ != AF_INET) {
+        return ERR_ADDRESS_INVALID;
+      }
+      ip_mreq mreq;
+      memset(&mreq, 0, sizeof(mreq));
+      memcpy(&mreq.imr_multiaddr, &group_address[0], kIPv4AddressSize);
+      rv = setsockopt(socket_, IPPROTO_IP, IP_DROP_MEMBERSHIP,
+                      reinterpret_cast<const char*>(&mreq),
+                      sizeof(mreq));
+      break;
+    }
+    case kIPv6AddressSize: {
+      if (sock_addr_family_ != AF_INET6) {
+        return ERR_ADDRESS_INVALID;
+      }
+      ipv6_mreq mreq;
+      memset(&mreq, 0, sizeof(mreq));
+      memcpy(&mreq.ipv6mr_multiaddr, &group_address[0], kIPv6AddressSize);
+      rv = setsockopt(socket_, IPPROTO_IPV6, IP_DROP_MEMBERSHIP,
+                      reinterpret_cast<const char*>(&mreq),
+                      sizeof(mreq));
+      break;
+    }
+  }
+  return MapSystemError(rv);
+}
+
+int UDPSocketWin::SetMulticastTimeToLive(int timeToLive) {

[mmenke, 2013/04/12 21:07:41]

time_to_live

[Bei Zhang, 2013/04/15 22:30:26]

Done.

+  DCHECK(CalledOnValidThread());
+  if(is_connected()) {

[mmenke, 2013/04/12 21:07:41]

Space after if

[Bei Zhang, 2013/04/15 22:30:26]

Done.

+    if (timeToLive < 0 || timeToLive > 255) {
+      return ERR_INVALID_ARGUMENT;
+    }
+    uint8 ttl = timeToLive;
+    int ip_family = sock_addr_family_ == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
+    return MapSystemError(setsockopt(socket_,
+        ip_family,
+        IP_MULTICAST_TTL,
+        reinterpret_cast<const char*>(&ttl),
+        sizeof(ttl)));
+  } else {
+    multicast_time_to_live_ = timeToLive;
+    return OK;
+  }
+

[mmenke, 2013/04/12 21:07:41]

Remove blank line.

[Bei Zhang, 2013/04/15 22:30:26]

Done.

+}
+
+int UDPSocketWin::SetMulticastLoopbackMode(bool loopback) {
+  DCHECK(CalledOnValidThread());
+  if(is_connected()) {

[mmenke, 2013/04/12 21:07:41]

Space after if

[Bei Zhang, 2013/04/15 22:30:26]

Done.

+    uint8 loop = loopback;
+    int ip_family = sock_addr_family_ == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
+    return MapSystemError(setsockopt(socket_,
+      ip_family,
+      IP_MULTICAST_LOOP,
+      reinterpret_cast<const char*>(&loop),
+      sizeof(loop)));

[mmenke, 2013/04/12 21:07:41]

4-space indent.

[Bei Zhang, 2013/04/15 22:30:26]

Done.

+  } else {
+    multicast_loopback_mode_ = loopback;
+    return OK;
+  }
+}
+
 }  // namespace net