/*
* this function builds a UDP packet and sends to the virtual node given by the
* ip and port parameters. this function assumes that the socket is already
* bound to a local port, no matter if that happened explicitly or implicitly.
*/
gssize udp_sendUserData(UDP* udp, gconstpointer buffer, gsize nBytes, in_addr_t ip, in_port_t port) {
MAGIC_ASSERT(udp);
gsize space = socket_getOutputBufferSpace(&(udp->super));
if(space < nBytes) {
/* not enough space to buffer the data */
return -1;
}
/* break data into segments and send each in a packet */
gsize maxPacketLength = CONFIG_DATAGRAM_MAX_SIZE;
gsize remaining = nBytes;
gsize offset = 0;
/* create as many packets as needed */
while(remaining > 0) {
gsize copyLength = MIN(maxPacketLength, remaining);
/* use default destination if none was specified */
in_addr_t destinationIP = (ip != 0) ? ip : udp->super.peerIP;
in_port_t destinationPort = (port != 0) ? port : udp->super.peerPort;
/* create the UDP packet */
Packet* packet = packet_new(buffer + offset, copyLength);
packet_setUDP(packet, PUDP_NONE, socket_getBinding(&(udp->super)),
udp->super.boundPort, destinationIP, destinationPort);
/* buffer it in the transport layer, to be sent out when possible */
gboolean success = socket_addToOutputBuffer((Socket*) udp, packet);
/* counter maintenance */
if(success) {
remaining -= copyLength;
offset += copyLength;
} else {
warning("unable to send UDP packet");
break;
}
}
/* update the tracker output buffer stats */
Tracker* tracker = node_getTracker(worker_getPrivate()->cached_node);
Socket* socket = (Socket* )udp;
Descriptor* descriptor = (Descriptor *)socket;
gsize outLength = socket_getOutputBufferLength(socket);
gsize outSize = socket_getOutputBufferSize(socket);
tracker_updateSocketOutputBuffer(tracker, descriptor->handle, outLength, outSize);
debug("buffered %"G_GSIZE_FORMAT" outbound UDP bytes from user", offset);
return (gssize) offset;
}
gssize udp_receiveUserData(UDP* udp, gpointer buffer, gsize nBytes, in_addr_t* ip, in_port_t* port) {
MAGIC_ASSERT(udp);
Packet* packet = socket_removeFromInputBuffer((Socket*)udp);
if(!packet) {
return -1;
}
/* copy lesser of requested and available amount to application buffer */
guint packetLength = packet_getPayloadLength(packet);
gsize copyLength = MIN(nBytes, packetLength);
guint bytesCopied = packet_copyPayload(packet, 0, buffer, copyLength);
utility_assert(bytesCopied == copyLength);
packet_addDeliveryStatus(packet, PDS_RCV_SOCKET_DELIVERED);
/* fill in address info */
if(ip) {
*ip = packet_getSourceIP(packet);
}
if(port) {
*port = packet_getSourcePort(packet);
}
/* destroy packet, throwing away any bytes not claimed by the app */
packet_unref(packet);
/* update the tracker output buffer stats */
Tracker* tracker = host_getTracker(worker_getCurrentHost());
Socket* socket = (Socket* )udp;
Descriptor* descriptor = (Descriptor *)socket;
gsize outLength = socket_getOutputBufferLength(socket);
gsize outSize = socket_getOutputBufferSize(socket);
tracker_updateSocketOutputBuffer(tracker, descriptor->handle, outLength, outSize);
debug("user read %u inbound UDP bytes", bytesCopied);
return (gssize)bytesCopied;
}
gint result = 0;
/* normally, the type of farg depends on the request */
Host* node = _system_switchInShadowContext();
Descriptor* descriptor = host_lookupDescriptor(node, fd);
if(descriptor) {
DescriptorType t = descriptor_getType(descriptor);
if(t == DT_TCPSOCKET || t == DT_UDPSOCKET) {
Socket* socket = (Socket*) descriptor;
if(request == SIOCINQ || request == FIONREAD) {
gsize bufferLength = socket_getInputBufferLength(socket);
gint* lengthOut = va_arg(farg, int*);
*lengthOut = (gint)bufferLength;
} else if (request == SIOCOUTQ || request == TIOCOUTQ) {
gsize bufferLength = socket_getOutputBufferLength(socket);
gint* lengthOut = va_arg(farg, int*);
*lengthOut = (gint)bufferLength;
} else {
result = ENOTTY;
}
} else {
result = ENOTTY;
}
} else {
result = EBADF;
}
_system_switchOutShadowContext(node);
return result;
}
/*
* this function builds a UDP packet and sends to the virtual node given by the
* ip and port parameters. this function assumes that the socket is already
* bound to a local port, no matter if that happened explicitly or implicitly.
*/
gssize udp_sendUserData(UDP* udp, gconstpointer buffer, gsize nBytes, in_addr_t ip, in_port_t port) {
MAGIC_ASSERT(udp);
gsize space = socket_getOutputBufferSpace(&(udp->super));
if(space < nBytes) {
/* not enough space to buffer the data */
return -1;
}
/* break data into segments and send each in a packet */
gsize maxPacketLength = CONFIG_DATAGRAM_MAX_SIZE;
gsize remaining = nBytes;
gsize offset = 0;
/* create as many packets as needed */
while(remaining > 0) {
gsize copyLength = MIN(maxPacketLength, remaining);
/* use default destination if none was specified */
in_addr_t destinationIP = (ip != 0) ? ip : udp->super.peerIP;
in_port_t destinationPort = (port != 0) ? port : udp->super.peerPort;
in_addr_t sourceIP = 0;
in_port_t sourcePort = 0;
socket_getSocketName(&(udp->super), &sourceIP, &sourcePort);
if(sourceIP == htonl(INADDR_ANY)) {
/* source interface depends on destination */
if(destinationIP == htonl(INADDR_LOOPBACK)) {
sourceIP = htonl(INADDR_LOOPBACK);
} else {
sourceIP = host_getDefaultIP(worker_getCurrentHost());
}
}
utility_assert(sourceIP && sourcePort && destinationIP && destinationPort);
/* create the UDP packet */
Packet* packet = packet_new(buffer + offset, copyLength);
packet_setUDP(packet, PUDP_NONE, sourceIP, sourcePort, destinationIP, destinationPort);
packet_addDeliveryStatus(packet, PDS_SND_CREATED);
/* buffer it in the transport layer, to be sent out when possible */
gboolean success = socket_addToOutputBuffer((Socket*) udp, packet);
/* counter maintenance */
if(success) {
remaining -= copyLength;
offset += copyLength;
} else {
warning("unable to send UDP packet");
break;
}
}
/* update the tracker output buffer stats */
Tracker* tracker = host_getTracker(worker_getCurrentHost());
Socket* socket = (Socket* )udp;
Descriptor* descriptor = (Descriptor *)socket;
gsize outLength = socket_getOutputBufferLength(socket);
gsize outSize = socket_getOutputBufferSize(socket);
tracker_updateSocketOutputBuffer(tracker, descriptor->handle, outLength, outSize);
debug("buffered %"G_GSIZE_FORMAT" outbound UDP bytes from user", offset);
return (gssize) offset;
}
