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/*
* Copyright 2006 Serge van den Boom <svdb@stack.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define PORT_WANT_ERRNO
#define NETCONNECTION_INTERNAL
#include "netplay.h"
#include "port.h"
#include "netconnection.h"
#include "netrcv.h"
#include "packet.h"
#include "types.h"
#include "libs/log.h"
#include <errno.h>
#include <string.h>
// Try to get a single packet from a stream of data.
// Returns 0 if the packet was successfully processed, or
// -1 on an error, in which case the state is unchanged.
static ssize_t
dataReceivedSingle(NetConnection *conn, const uint8 *data,
size_t dataLen) {
uint32 packetLen;
PacketType type;
int result;
if (dataLen < sizeof (PacketHeader)) {
// Incomplete packet. We'll have to wait for the rest.
return 0;
}
packetLen = packetLength((const Packet *) data);
type = packetType((const Packet *) data);
if (!validPacketType(type)) {
log_add(log_Warning, "Packet with invalid type %d received.\n", type);
errno = EBADMSG;
return -1;
}
if (packetLen < packetTypeData[type].len) {
// Bad len field of packet.
log_add(log_Warning, "Packet with bad length field received (type="
"%s, lenfield=%d.\n", packetTypeData[type].name,
packetLen);
errno = EBADMSG;
return -1;
}
if (dataLen < packetLen) {
// Incomplete packet. We'll have to wait for the rest.
return 0;
}
#ifdef NETPLAY_STATISTICS
NetConnection_getStatistics(conn)->packetsReceived++;
NetConnection_getStatistics(conn)->packetTypeReceived[type]++;
#endif
#ifdef NETPLAY_DEBUG
if (type != PACKET_BATTLEINPUT && type != PACKET_CHECKSUM) {
// Reporting BattleInput and Checksum would get so spammy that it
// would slow down the battle.
log_add(log_Debug, "NETPLAY: [%d] <== Received packet of type %s.\n",
NetConnection_getPlayerNr(conn), packetTypeData[type].name);
}
#ifdef NETPLAY_DEBUG_FILE
if (conn->debugFile != NULL) {
uio_fprintf(conn->debugFile,
"NETPLAY: [%d] <== Received packet of type %s.\n",
NetConnection_getPlayerNr(conn), packetTypeData[type].name);
}
#endif /* NETPLAY_DEBUG_FILE */
#endif /* NETPLAY_DEBUG */
result = packetTypeData[type].handler(conn, data);
if (result == -1) {
// An error occured. errno is set by the handler.
return -1;
}
return packetLen;
}
// Try to get all the packets from a stream of data.
// Returns the number of bytes processed.
static ssize_t
dataReceivedMulti(NetConnection *conn, const uint8 *data, size_t len) {
size_t processed;
processed = 0;
while (len > 0) {
ssize_t packetLen = dataReceivedSingle(conn, data, len);
if (packetLen == -1) {
// Bad packet. Errno is set.
return -1;
}
if (packetLen == 0) {
// No packet was processed. This means that no complete
// packet arrived.
break;
}
processed += packetLen;
data += packetLen;
len -= packetLen;
}
return processed;
}
void
dataReadyCallback(NetDescriptor *nd) {
NetConnection *conn = (NetConnection *) NetDescriptor_getExtra(nd);
Socket *socket = NetDescriptor_getSocket(nd);
for (;;) {
ssize_t numRead;
ssize_t numProcessed;
numRead = Socket_recv(socket, conn->readEnd,
NETPLAY_READBUFSIZE - (conn->readEnd - conn->readBuf), 0);
if (numRead == 0) {
// Other side closed the connection.
NetDescriptor_close(nd);
return;
}
if (numRead == -1) {
if (errno == EWOULDBLOCK || errno == EAGAIN)
return; // No more data for now.
else if (errno == EINTR)
continue; // System call was interrupted. Retry.
else
{
int savedErrno = errno;
log_add(log_Error, "recv() failed: %s.\n",
strerror(errno));
NetConnection_doErrorCallback(conn, savedErrno);
NetDescriptor_close(nd);
return;
}
}
conn->readEnd += numRead;
numProcessed = dataReceivedMulti(conn, conn->readBuf,
conn->readEnd - conn->readBuf);
if (numProcessed == -1) {
// An error occured during processing.
// errno is set.
NetConnection_doErrorCallback(conn, errno);
NetDescriptor_close(nd);
return;
}
if (numProcessed == 0) {
// No packets could be processed. This means we need to receive
// more data first.
return;
}
// Some packets have been processed.
// We more any rest to the front of the buffer, to make room
// for more data.
// A cyclic buffer would obviate the need for this move,
// but it would complicate things a lot.
memmove(conn->readBuf, conn->readBuf + numProcessed,
(conn->readEnd - conn->readBuf) - numProcessed);
conn->readEnd -= numProcessed;
}
}
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