aboutsummaryrefslogtreecommitdiff
path: root/nxcomp/Channel.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'nxcomp/Channel.cpp')
-rwxr-xr-xnxcomp/Channel.cpp2125
1 files changed, 2125 insertions, 0 deletions
diff --git a/nxcomp/Channel.cpp b/nxcomp/Channel.cpp
new file mode 100755
index 000000000..1fdb3a0d3
--- /dev/null
+++ b/nxcomp/Channel.cpp
@@ -0,0 +1,2125 @@
+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NXCOMP, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of NoMachine S.r.l. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+#include "Channel.h"
+
+#include "List.h"
+#include "Proxy.h"
+#include "Statistics.h"
+
+#include "StaticCompressor.h"
+
+#include "NXalert.h"
+
+extern Proxy *proxy;
+
+//
+// Set the verbosity level.
+//
+
+#define PANIC
+#define WARNING
+#undef TEST
+#undef DEBUG
+#undef DUMP
+
+//
+// Log the operations related to splits.
+//
+
+#undef SPLIT
+
+#undef COUNT
+
+#define COUNT_MAJOR_OPCODE 154
+
+#undef MONITOR
+
+#define MONITOR_MAJOR_OPCODE 154
+#define MONITOR_MINOR_OPCODE 23
+
+#undef CLEAR
+
+#define CLEAR_MAJOR_OPCODE 154
+#define CLEAR_MINOR_OPCODE 23
+
+//
+// Define this to know how many messages
+// are allocated and deallocated.
+//
+
+#undef REFERENCES
+
+//
+// Set to the descriptor of the first X
+// channel successfully connected.
+//
+
+int Channel::firstClient_ = -1;
+
+//
+// Port used for font server connections.
+//
+
+int Channel::fontPort_ = -1;
+
+//
+// This is used for reference count.
+//
+
+#ifdef REFERENCES
+
+int Channel::references_ = 0;
+
+#endif
+
+Channel::Channel(Transport *transport, StaticCompressor *compressor)
+
+ : transport_(transport), compressor_(compressor)
+{
+ fd_ = transport_ -> fd();
+
+ finish_ = 0;
+ closing_ = 0;
+ drop_ = 0;
+ congestion_ = 0;
+ priority_ = 0;
+
+ alert_ = 0;
+
+ firstRequest_ = 1;
+ firstReply_ = 1;
+
+ enableCache_ = 1;
+ enableSplit_ = 1;
+ enableSave_ = 1;
+ enableLoad_ = 1;
+
+ //
+ // Must be set by proxy.
+ //
+
+ opcodeStore_ = NULL;
+
+ clientStore_ = NULL;
+ serverStore_ = NULL;
+
+ clientCache_ = NULL;
+ serverCache_ = NULL;
+
+ #ifdef REFERENCES
+ *logofs << "Channel: Created new Channel at "
+ << this << " out of " << ++references_
+ << " allocated references.\n" << logofs_flush;
+ #endif
+}
+
+Channel::~Channel()
+{
+ if (firstClient_ == fd_)
+ {
+ firstClient_ = -1;
+ }
+
+ #ifdef REFERENCES
+ *logofs << "Channel: Deleted Channel at "
+ << this << " out of " << --references_
+ << " allocated references.\n" << logofs_flush;
+ #endif
+}
+
+int Channel::handleEncode(EncodeBuffer &encodeBuffer, ChannelCache *channelCache,
+ MessageStore *store, const unsigned char opcode,
+ const unsigned char *buffer, const unsigned int size)
+{
+ #ifdef MONITOR
+
+ static float totalMessages = 0;
+ static float totalBits = 0;
+
+ int bits;
+ int diff;
+
+ bits = encodeBuffer.getBits();
+
+ #endif
+
+ //
+ // Check if message can be differentially
+ // encoded using a similar message in the
+ // message store.
+ //
+
+ #ifdef COUNT
+
+ if (*(buffer) == COUNT_MAJOR_OPCODE)
+ {
+ if (*(buffer) < 128)
+ {
+ *logofs << "handleEncode: Handling OPCODE#" << (unsigned int) *(buffer)
+ << ".\n" << logofs_flush;
+ }
+ else
+ {
+ *logofs << "handleEncode: Handling OPCODE#" << (unsigned int) *(buffer)
+ << " MINOR#" << (unsigned int) *(buffer + 1) << ".\n"
+ << logofs_flush;
+ }
+ }
+
+ #endif
+
+ #ifdef CLEAR
+
+ if (*(buffer) == CLEAR_MAJOR_OPCODE &&
+ (CLEAR_MINOR_OPCODE == -1 || *(buffer + 1) == CLEAR_MINOR_OPCODE))
+ {
+ *((unsigned char *) buffer) = X_NoOperation;
+
+ *((unsigned char *) buffer + 1) = '\0';
+
+ CleanData((unsigned char *) buffer + 4, size - 4);
+ }
+
+ #endif
+
+ if (handleEncodeCached(encodeBuffer, channelCache,
+ store, buffer, size) == 1)
+ {
+ #ifdef MONITOR
+
+ diff = encodeBuffer.getBits() - bits;
+
+ if (*(buffer) == MONITOR_MAJOR_OPCODE &&
+ (MONITOR_MINOR_OPCODE == -1 || *(buffer + 1) == MONITOR_MINOR_OPCODE))
+ {
+ totalMessages++;
+
+ totalBits += diff;
+
+ *logofs << "handleEncode: Handled cached OPCODE#" << (unsigned int) *(buffer)
+ << " MINOR#" << (unsigned int) *(buffer + 1) << ". " << size
+ << " bytes in, " << diff << " bits (" << ((float) diff) / 8
+ << " bytes) out. Average " << totalBits / totalMessages
+ << "/1.\n" << logofs_flush;
+ }
+
+ #endif
+
+ //
+ // Let the channel update the split store
+ // and notify the agent in the case of a
+ // cache hit.
+ //
+
+ if (store -> enableSplit)
+ {
+ handleSplit(encodeBuffer, store, store -> lastAction,
+ store -> lastHit, opcode, buffer, size);
+ }
+
+ return 1;
+ }
+
+ //
+ // A similar message could not be found in
+ // cache or message must be discarded. Must
+ // transmit the message using the field by
+ // field differential encoding.
+ //
+
+ handleEncodeIdentity(encodeBuffer, channelCache,
+ store, buffer, size, bigEndian_);
+
+ //
+ // Check if message has a distinct data part.
+ //
+
+ if (store -> enableData)
+ {
+ //
+ // If message split was requested by agent then send data
+ // out-of-band, dividing it in small chunks. Until message
+ // is completely transferred, keep in the split store a
+ // dummy version of the message, with data replaced with a
+ // pattern.
+ //
+ // While data is being transferred, agent should have put
+ // the resource (for example its client) asleep. It can
+ // happen, though, that a different client would reference
+ // the same message. We cannot issue a cache hit for images
+ // being split (such images are put in store in 'incomplete'
+ // state), so we need to handle this case.
+ //
+
+ if (store -> enableSplit == 1)
+ {
+ //
+ // Let the channel decide what to do with the
+ // message. If the split can't take place be-
+ // cause the split store is full, the channel
+ // will tell the remote side that the data is
+ // going to follow.
+ //
+
+ if (handleSplit(encodeBuffer, store, store -> lastAction,
+ (store -> lastAction == IS_ADDED ? store -> lastAdded : 0),
+ opcode, buffer, size) == 1)
+ {
+ #ifdef MONITOR
+
+ diff = encodeBuffer.getBits() - bits;
+
+ if (*(buffer) == MONITOR_MAJOR_OPCODE &&
+ (MONITOR_MINOR_OPCODE == -1 || *(buffer + 1) == MONITOR_MINOR_OPCODE))
+ {
+ totalMessages++;
+
+ totalBits += diff;
+
+ *logofs << "handleEncode: Handled split OPCODE#" << (unsigned int) *(buffer)
+ << " MINOR#" << (unsigned int) *(buffer + 1) << ". " << size
+ << " bytes in, " << diff << " bits (" << ((float) diff) / 8
+ << " bytes) out. Average " << totalBits / totalMessages
+ << "/1.\n" << logofs_flush;
+ }
+
+ #endif
+
+ return 0;
+ }
+ }
+
+ //
+ // The split did not take place and we are going
+ // to transfer the data part. Check if the static
+ // compression of the data section is enabled.
+ // This is the case of all messages not having a
+ // special differential encoding or messages that
+ // we want to store in cache in compressed form.
+ //
+
+ unsigned int offset = store -> identitySize(buffer, size);
+
+ if (store -> enableCompress)
+ {
+ unsigned char *data = NULL;
+ unsigned int dataSize = 0;
+
+ int compressed = handleCompress(encodeBuffer, opcode, offset,
+ buffer, size, data, dataSize);
+ if (compressed < 0)
+ {
+ return -1;
+ }
+ else if (compressed > 0)
+ {
+ //
+ // Update the size of the message according
+ // to the result of the data compression.
+ //
+
+ handleUpdate(store, size - offset, dataSize);
+ }
+ }
+ else
+ {
+ handleCopy(encodeBuffer, opcode, offset, buffer, size);
+ }
+ }
+
+ #ifdef MONITOR
+
+ diff = encodeBuffer.getBits() - bits;
+
+ if (*(buffer) == MONITOR_MAJOR_OPCODE &&
+ (MONITOR_MINOR_OPCODE == -1 || *(buffer + 1) == MONITOR_MINOR_OPCODE))
+ {
+ totalMessages++;
+
+ totalBits += diff;
+
+ *logofs << "handleEncode: Handled OPCODE#" << (unsigned int) *(buffer)
+ << " MINOR#" << (unsigned int) *(buffer + 1) << ". " << size
+ << " bytes in, " << diff << " bits (" << ((float) diff) / 8
+ << " bytes) out. Average " << totalBits / totalMessages
+ << "/1.\n" << logofs_flush;
+ }
+
+ #endif
+
+ return 0;
+}
+
+int Channel::handleDecode(DecodeBuffer &decodeBuffer, ChannelCache *channelCache,
+ MessageStore *store, unsigned char &opcode,
+ unsigned char *&buffer, unsigned int &size)
+{
+ //
+ // Check first if the message is in the
+ // message store.
+ //
+
+ unsigned int split = 0;
+
+ if (handleDecodeCached(decodeBuffer, channelCache,
+ store, buffer, size) == 1)
+ {
+ //
+ // Let the channel update the split store
+ // in the case of a message being cached.
+ //
+
+ if (store -> enableSplit == 1)
+ {
+ if (control -> isProtoStep7() == 1)
+ {
+ #ifdef DEBUG
+ *logofs << "handleDecode: " << store -> name()
+ << ": Checking if the message was split.\n"
+ << logofs_flush;
+ #endif
+
+ decodeBuffer.decodeBoolValue(split);
+ }
+
+ if (split == 1)
+ {
+ handleSplit(decodeBuffer, store, store -> lastAction,
+ store -> lastHit, opcode, buffer, size);
+
+ handleCleanAndNullRequest(opcode, buffer, size);
+ }
+ }
+
+ return 1;
+ }
+
+ //
+ // Decode the full identity.
+ //
+
+ handleDecodeIdentity(decodeBuffer, channelCache, store, buffer,
+ size, bigEndian_, &writeBuffer_);
+
+ //
+ // Check if the message has a distinct
+ // data part.
+ //
+
+ if (store -> enableData)
+ {
+ //
+ // Check if message has been split.
+ //
+
+ if (store -> enableSplit)
+ {
+ #ifdef DEBUG
+ *logofs << "handleDecode: " << store -> name()
+ << ": Checking if the message was split.\n"
+ << logofs_flush;
+ #endif
+
+ decodeBuffer.decodeBoolValue(split);
+
+ if (split == 1)
+ {
+ //
+ // If the message was added to the store,
+ // create the entry without the data part.
+ //
+
+ handleSaveSplit(store, buffer, size);
+
+ handleSplit(decodeBuffer, store, store -> lastAction,
+ (store -> lastAction == IS_ADDED ? store -> lastAdded : 0),
+ opcode, buffer, size);
+
+ handleCleanAndNullRequest(opcode, buffer, size);
+
+ return 0;
+ }
+ }
+
+ //
+ // Decode the data part.
+ //
+
+ unsigned int offset = store -> identitySize(buffer, size);
+
+ if (store -> enableCompress)
+ {
+ const unsigned char *data = NULL;
+ unsigned int dataSize = 0;
+
+ int decompressed = handleDecompress(decodeBuffer, opcode, offset,
+ buffer, size, data, dataSize);
+ if (decompressed < 0)
+ {
+ return -1;
+ }
+ else if (decompressed > 0)
+ {
+ //
+ // The message has been transferred
+ // in compressed format.
+ //
+
+ handleSave(store, buffer, size, data, dataSize);
+
+ if (store -> enableSplit)
+ {
+ if (split == 1)
+ {
+ handleSplit(decodeBuffer, store, store -> lastAction,
+ (store -> lastAction == IS_ADDED ? store -> lastAdded : 0),
+ opcode, buffer, size);
+
+ handleCleanAndNullRequest(opcode, buffer, size);
+ }
+ }
+
+ return 0;
+ }
+ }
+ else
+ {
+ //
+ // Static compression of the data part
+ // was not enabled for this message.
+ //
+
+ handleCopy(decodeBuffer, opcode, offset, buffer, size);
+ }
+ }
+
+ //
+ // The message doesn't have a data part
+ // or the data was not compressed.
+ //
+
+ handleSave(store, buffer, size);
+
+ if (store -> enableSplit)
+ {
+ if (split == 1)
+ {
+ handleSplit(decodeBuffer, store, store -> lastAction,
+ (store -> lastAction == IS_ADDED ? store -> lastAdded : 0),
+ opcode, buffer, size);
+
+ handleCleanAndNullRequest(opcode, buffer, size);
+ }
+ }
+
+ return 0;
+}
+
+int Channel::handleEncodeCached(EncodeBuffer &encodeBuffer, ChannelCache *channelCache,
+ MessageStore *store, const unsigned char *buffer,
+ const unsigned int size)
+{
+ if (control -> LocalDeltaCompression == 0 ||
+ enableCache_ == 0 || store -> enableCache == 0)
+ {
+ if (control -> isProtoStep7() == 1)
+ {
+ encodeBuffer.encodeActionValue(is_discarded,
+ store -> lastActionCache);
+ }
+ else
+ {
+ encodeBuffer.encodeActionValueCompat(is_discarded,
+ store -> lastActionCacheCompat);
+ }
+
+ store -> lastAction = is_discarded;
+
+ return 0;
+ }
+
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Going to handle a new message of this class.\n"
+ << logofs_flush;
+ #endif
+
+ //
+ // Check if the estimated size of cache is greater
+ // than the requested limit. If it is the case make
+ // some room by deleting one or more messages.
+ //
+
+ int position;
+
+ while (mustCleanStore(store) == 1 && canCleanStore(store) == 1)
+ {
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Trying to reduce size of message store.\n"
+ << logofs_flush;
+ #endif
+
+ position = store -> clean(use_checksum);
+
+ if (position == nothing)
+ {
+ #ifdef TEST
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": WARNING! No message found to be "
+ << "actually removed.\n" << logofs_flush;
+ #endif
+
+ break;
+ }
+
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Message at position " << position
+ << " will be removed.\n" << logofs_flush;
+ #endif
+
+ //
+ // Encode the position of message to
+ // be discarded.
+ //
+
+ store -> lastRemoved = position;
+
+ if (control -> isProtoStep7() == 1)
+ {
+ encodeBuffer.encodeActionValue(is_removed, store -> lastRemoved,
+ store -> lastActionCache);
+ }
+ else
+ {
+ encodeBuffer.encodeActionValueCompat(is_removed,
+ store -> lastActionCacheCompat);
+
+ encodeBuffer.encodePositionValueCompat(store -> lastRemoved,
+ store -> lastRemovedCacheCompat);
+ }
+
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name() << ": Going to "
+ << "clean up message at position " << position << ".\n"
+ << logofs_flush;
+ #endif
+
+ store -> remove(position, use_checksum, discard_data);
+
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name() << ": There are "
+ << store -> getSize() << " messages in the store out of "
+ << store -> cacheSlots << " slots.\n" << logofs_flush;
+
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Size of store is " << store -> getLocalStorageSize()
+ << " bytes locally and " << store -> getRemoteStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Size of total cache is " << store -> getLocalTotalStorageSize()
+ << " bytes locally and " << store -> getRemoteTotalStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+ #endif
+ }
+
+ #ifdef DEBUG
+
+ if (mustCleanStore(store) == 1 && canCleanStore(store) == 0)
+ {
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Store would need a clean but operation will be delayed.\n"
+ << logofs_flush;
+
+ *logofs << "handleEncodeCached: " << store -> name() << ": There are "
+ << store -> getSize() << " messages in the store out of "
+ << store -> cacheSlots << " slots.\n" << logofs_flush;
+
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Size of store is " << store -> getLocalStorageSize()
+ << " bytes locally and " << store -> getRemoteStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Size of total cache is " << store -> getLocalTotalStorageSize()
+ << " bytes locally and " << store -> getRemoteTotalStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+ }
+
+ #endif
+
+ //
+ // If 'on the wire' size of message exceeds the
+ // allowed limit then avoid to store it in the
+ // cache.
+ //
+
+ if (store -> validateMessage(buffer, size) == 0)
+ {
+ #ifdef TEST
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Message with size " << size << " ignored.\n"
+ << logofs_flush;
+ #endif
+
+ if (control -> isProtoStep7() == 1)
+ {
+ encodeBuffer.encodeActionValue(is_discarded,
+ store -> lastActionCache);
+ }
+ else
+ {
+ encodeBuffer.encodeActionValueCompat(is_discarded,
+ store -> lastActionCacheCompat);
+ }
+
+ store -> lastAction = is_discarded;
+
+ return 0;
+ }
+
+ //
+ // Fill the message object with the
+ // received data.
+ //
+
+ Message *message = store -> getTemporary();
+
+ if (message == NULL)
+ {
+ #ifdef PANIC
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": PANIC! Can't allocate memory for "
+ << "a new message.\n" << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Can't allocate memory for "
+ << "a new message in context [D].\n";
+
+ HandleCleanup();
+ }
+
+ //
+ // As we are at encoding side, it is enough to store the
+ // checksum for the object while data can be erased. Both
+ // the identity and the data will never be sent through
+ // the wire again as long as they are stored in the cache
+ // at the decoding side. The split parameter is always
+ // set to 0 as the data will not be stored in any case.
+ //
+
+ store -> parse(message, 0, buffer, size, use_checksum,
+ discard_data, bigEndian_);
+
+ #ifdef DUMP
+
+ store -> dump(message);
+
+ #endif
+
+ //
+ // Search the object in the message
+ // store. If found get the position.
+ //
+
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Searching object of size " << size
+ << " in the cache.\n" << logofs_flush;
+ #endif
+
+ int added;
+ int locked;
+
+ position = store -> findOrAdd(message, use_checksum,
+ discard_data, added, locked);
+
+ if (position == nothing)
+ {
+ #ifdef WARNING
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": WARNING! Can't store object in the cache.\n"
+ << logofs_flush;
+ #endif
+
+ if (control -> isProtoStep7() == 1)
+ {
+ encodeBuffer.encodeActionValue(is_discarded,
+ store -> lastActionCache);
+ }
+ else
+ {
+ encodeBuffer.encodeActionValueCompat(is_discarded,
+ store -> lastActionCacheCompat);
+ }
+
+ store -> lastAction = is_discarded;
+
+ return 0;
+ }
+ else if (locked == 1)
+ {
+ //
+ // We can't issue a cache hit. Encoding identity
+ // differences while message it's being split
+ // would later result in agent to commit a wrong
+ // version of message.
+ //
+
+ #ifdef WARNING
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": WARNING! Message of size " << store -> plainSize(position)
+ << " at position " << position << " is locked.\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Warning" << ": Message of size " << store -> plainSize(position)
+ << " at position " << position << " is locked.\n";
+
+ if (control -> isProtoStep7() == 1)
+ {
+ encodeBuffer.encodeActionValue(is_discarded,
+ store -> lastActionCache);
+ }
+ else
+ {
+ encodeBuffer.encodeActionValueCompat(is_discarded,
+ store -> lastActionCacheCompat);
+ }
+
+ store -> lastAction = is_discarded;
+
+ return 0;
+ }
+ else if (added == 1)
+ {
+ store -> resetTemporary();
+
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name() << ": Message of size "
+ << store -> plainSize(position) << " has been stored at position "
+ << position << ".\n" << logofs_flush;
+
+ *logofs << "handleEncodeCached: " << store -> name() << ": There are "
+ << store -> getSize() << " messages in the store out of "
+ << store -> cacheSlots << " slots.\n" << logofs_flush;
+
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Size of store is " << store -> getLocalStorageSize()
+ << " bytes locally and " << store -> getRemoteStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Size of total cache is " << store -> getLocalTotalStorageSize()
+ << " bytes locally and " << store -> getRemoteTotalStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+ #endif
+
+ //
+ // Inform the decoding side that message
+ // must be inserted in cache and encode
+ // the position where the insertion took
+ // place.
+ //
+
+ store -> lastAction = IS_ADDED;
+
+ store -> lastAdded = position;
+
+ if (control -> isProtoStep7() == 1)
+ {
+ encodeBuffer.encodeActionValue(IS_ADDED, store -> lastAdded,
+ store -> lastActionCache);
+
+ }
+ else
+ {
+ encodeBuffer.encodeActionValueCompat(IS_ADDED,
+ store -> lastActionCacheCompat);
+
+ encodeBuffer.encodePositionValueCompat(store -> lastAdded,
+ store -> lastAddedCacheCompat);
+ }
+
+ return 0;
+ }
+ else
+ {
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name()
+ << ": Cache hit. Found object at position "
+ << position << ".\n" << logofs_flush;
+ #endif
+
+ //
+ // Must abort the connection if the
+ // the position is invalid.
+ //
+
+ Message *cachedMessage = store -> get(position);
+
+ //
+ // Increase the rating of the cached
+ // message.
+ //
+
+ store -> touch(cachedMessage);
+
+ #ifdef DEBUG
+ *logofs << "handleEncodeCached: " << store -> name() << ": Hits for "
+ << "object at position " << position << " are now "
+ << store -> getTouches(position) << ".\n"
+ << logofs_flush;
+ #endif
+
+ //
+ // Send to the decoding side position
+ // where object can be found in cache.
+ //
+
+ store -> lastAction = IS_HIT;
+
+ store -> lastHit = position;
+
+ if (control -> isProtoStep7() == 1)
+ {
+ encodeBuffer.encodeActionValue(IS_HIT, store -> lastHit,
+ store -> lastActionCache);
+ }
+ else
+ {
+ encodeBuffer.encodeActionValueCompat(IS_HIT,
+ store -> lastActionCacheCompat);
+
+ encodeBuffer.encodePositionValueCompat(store -> lastHit,
+ store -> lastHitCacheCompat);
+ }
+
+ //
+ // Send the field by field differences in
+ // respect to the original message stored
+ // in cache.
+ //
+
+ store -> updateIdentity(encodeBuffer, message, cachedMessage, channelCache);
+
+ return 1;
+ }
+}
+
+void Channel::handleUpdateAdded(MessageStore *store, unsigned int dataSize,
+ unsigned int compressedDataSize)
+{
+ #ifdef TEST
+
+ if (store -> lastAction != IS_ADDED)
+ {
+ #ifdef PANIC
+ *logofs << "handleUpdateAdded: " << store -> name()
+ << ": PANIC! Function called for action '"
+ << store -> lastAction << "'.\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Update function called for "
+ << "store '" << store -> name() << "' with "
+ << "action '" << store -> lastAction
+ << "'.\n";
+
+ HandleCleanup();
+ }
+
+ #endif
+
+ #ifdef DEBUG
+ *logofs << "handleUpdateAdded: " << store -> name() << ": Updating "
+ << "object at position " << store -> lastAdded << " of size "
+ << store -> plainSize(store -> lastAdded) << " (" << dataSize
+ << "/" << compressedDataSize << ").\n" << logofs_flush;
+ #endif
+
+ store -> updateData(store -> lastAdded, dataSize, compressedDataSize);
+
+ #ifdef DEBUG
+ *logofs << "handleUpdateAdded: " << store -> name() << ": There are "
+ << store -> getSize() << " messages in the store out of "
+ << store -> cacheSlots << " slots.\n" << logofs_flush;
+
+ *logofs << "handleUpdateAdded: " << store -> name()
+ << ": Size of store is " << store -> getLocalStorageSize()
+ << " bytes locally and " << store -> getRemoteStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+
+ *logofs << "handleUpdateAdded: " << store -> name()
+ << ": Size of total cache is " << store -> getLocalTotalStorageSize()
+ << " bytes locally and " << store -> getRemoteTotalStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+ #endif
+}
+
+int Channel::handleDecodeCached(DecodeBuffer &decodeBuffer, ChannelCache *channelCache,
+ MessageStore *store, unsigned char *&buffer,
+ unsigned int &size)
+{
+ //
+ // Create a new message object and
+ // fill it with received data.
+ //
+
+ #ifdef DEBUG
+ *logofs << "handleDecodeCached: " << store -> name()
+ << ": Going to handle a new message of this class.\n"
+ << logofs_flush;
+ #endif
+
+ //
+ // Decode bits telling how to handle
+ // this message.
+ //
+
+ unsigned char action;
+ unsigned short int position;
+
+ if (control -> isProtoStep7() == 1)
+ {
+ decodeBuffer.decodeActionValue(action, position,
+ store -> lastActionCache);
+ }
+ else
+ {
+ decodeBuffer.decodeActionValueCompat(action,
+ store -> lastActionCacheCompat);
+ }
+
+ //
+ // Clean operations must always come
+ // before any operation on message.
+ //
+
+ while (action == is_removed)
+ {
+ if (control -> isProtoStep7() == 1)
+ {
+ store -> lastRemoved = position;
+ }
+ else
+ {
+ decodeBuffer.decodePositionValueCompat(store -> lastRemoved,
+ store -> lastRemovedCacheCompat);
+ }
+
+ #ifdef DEBUG
+
+ if (store -> get(store -> lastRemoved))
+ {
+ *logofs << "handleDecodeCached: " << store -> name() << ": Cleaning up "
+ << "object at position " << store -> lastRemoved
+ << " of size " << store -> plainSize(store -> lastRemoved)
+ << " (" << store -> plainSize(store -> lastRemoved) << "/"
+ << store -> compressedSize(store -> lastRemoved) << ").\n"
+ << logofs_flush;
+ }
+
+ #endif
+
+ //
+ // If the message can't be found we
+ // will abort the connection.
+ //
+
+ store -> remove(store -> lastRemoved, discard_checksum, use_data);
+
+ if (control -> isProtoStep7() == 1)
+ {
+ decodeBuffer.decodeActionValue(action, position,
+ store -> lastActionCache);
+ }
+ else
+ {
+ decodeBuffer.decodeActionValueCompat(action,
+ store -> lastActionCacheCompat);
+ }
+ }
+
+ //
+ // If it's a cache hit, the position
+ // where object can be found follows.
+ //
+
+ if ((T_store_action) action == IS_HIT)
+ {
+ if (control -> isProtoStep7() == 1)
+ {
+ store -> lastHit = position;
+ }
+ else
+ {
+ decodeBuffer.decodePositionValueCompat(store -> lastHit,
+ store -> lastHitCacheCompat);
+ }
+
+ //
+ // Get data from the cache at given position.
+ //
+
+ #ifdef DEBUG
+
+ if (store -> get(store -> lastHit))
+ {
+ *logofs << "handleDecodeCached: " << store -> name() << ": Retrieving "
+ << "object at position " << store -> lastHit
+ << " of size " << store -> plainSize(store -> lastHit)
+ << " (" << store -> plainSize(store -> lastHit) << "/"
+ << store -> compressedSize(store -> lastHit) << ").\n"
+ << logofs_flush;
+ }
+
+ #endif
+
+ //
+ // Must abort the connection if the
+ // the position is invalid.
+ //
+
+ Message *message = store -> get(store -> lastHit);
+
+ //
+ // Make room for the outgoing message.
+ //
+
+ size = store -> plainSize(store -> lastHit);
+
+ buffer = writeBuffer_.addMessage(size);
+
+ #ifdef DEBUG
+ *logofs << "handleDecodeCached: " << store -> name()
+ << ": Prepared an outgoing buffer of "
+ << size << " bytes.\n" << logofs_flush;
+ #endif
+
+ //
+ // Decode the variant part. Pass client
+ // or server cache to the message store.
+ //
+
+ store -> updateIdentity(decodeBuffer, message, channelCache);
+
+ //
+ // Write each field in the outgoing buffer.
+ //
+
+ store -> unparse(message, buffer, size, bigEndian_);
+
+ #ifdef DUMP
+
+ store -> dump(message);
+
+ #endif
+
+ store -> lastAction = IS_HIT;
+
+ return 1;
+ }
+ else if ((T_store_action) action == IS_ADDED)
+ {
+ if (control -> isProtoStep7() == 1)
+ {
+ store -> lastAdded = position;
+ }
+ else
+ {
+ decodeBuffer.decodePositionValueCompat(store -> lastAdded,
+ store -> lastAddedCacheCompat);
+ }
+
+ #ifdef DEBUG
+ *logofs << "handleDecodeCached: " << store -> name()
+ << ": Message will be later stored at position "
+ << store -> lastAdded << ".\n" << logofs_flush;
+ #endif
+
+ store -> lastAction = IS_ADDED;
+
+ return 0;
+ }
+ else
+ {
+ #ifdef DEBUG
+ *logofs << "handleDecodeCached: " << store -> name()
+ << ": Message will be later discarded.\n"
+ << logofs_flush;
+ #endif
+
+ store -> lastAction = is_discarded;
+
+ return 0;
+ }
+}
+
+void Channel::handleSaveAdded(MessageStore *store, int split, unsigned char *buffer,
+ unsigned int size, const unsigned char *compressedData,
+ const unsigned int compressedDataSize)
+{
+ #ifdef TEST
+
+ if (store -> lastAction != IS_ADDED)
+ {
+ #ifdef PANIC
+ *logofs << "handleSaveAdded: " << store -> name()
+ << ": PANIC! Function called for action '"
+ << store -> lastAction << "'.\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Save function called for "
+ << "store '" << store -> name() << "' with "
+ << "action '" << store -> lastAction
+ << "'.\n";
+
+ HandleCleanup();
+ }
+
+ #endif
+
+ Message *message = store -> getTemporary();
+
+ if (message == NULL)
+ {
+ #ifdef PANIC
+ *logofs << "handleSaveAdded: " << store -> name()
+ << ": PANIC! Can't access temporary storage "
+ << "for message at position " << store -> lastAdded
+ << ".\n" << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Can't access temporary storage "
+ << "for message at position " << store -> lastAdded
+ << ".\n";
+
+ HandleCleanup();
+ }
+
+ if (compressedData == NULL)
+ {
+ //
+ // If the data part has been split
+ // avoid to copy it into the message.
+ //
+
+ store -> parse(message, split, buffer, size, discard_checksum,
+ use_data, bigEndian_);
+ }
+ else
+ {
+ store -> parse(message, buffer, size, compressedData,
+ compressedDataSize, discard_checksum,
+ use_data, bigEndian_);
+ }
+
+ if (store -> add(message, store -> lastAdded,
+ discard_checksum, use_data) == nothing)
+ {
+ #ifdef PANIC
+ *logofs << "handleSaveAdded: " << store -> name()
+ << ": PANIC! Can't store message in the cache "
+ << "at position " << store -> lastAdded << ".\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Can't store message of type "
+ << store -> name() << "in the cache at position "
+ << store -> lastAdded << ".\n";
+
+ HandleCleanup();
+ }
+ else
+ {
+ store -> resetTemporary();
+
+ #ifdef DEBUG
+ *logofs << "handleSaveAdded: " << store -> name() << ": Stored "
+ << (compressedData == NULL ? "plain" : "compressed")
+ << " object at position " << store -> lastAdded
+ << " of size " << store -> plainSize(store -> lastAdded)
+ << " (" << store -> plainSize(store -> lastAdded) << "/"
+ << store -> compressedSize(store -> lastAdded) << ").\n"
+ << logofs_flush;
+ #endif
+ }
+
+ #ifdef DEBUG
+ *logofs << "handleSaveAdded: " << store -> name()
+ << ": Size of store is " << store -> getLocalStorageSize()
+ << " bytes locally and " << store -> getRemoteStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+
+ *logofs << "handleSaveAdded: " << store -> name()
+ << ": Size of total cache is " << store -> getLocalTotalStorageSize()
+ << " bytes locally and " << store -> getRemoteTotalStorageSize()
+ << " bytes remotely.\n" << logofs_flush;
+ #endif
+}
+
+int Channel::handleWait(int timeout)
+{
+ #ifdef TEST
+ *logofs << "handleWait: Going to wait for more data "
+ << "on FD#" << fd_ << " at " << strMsTimestamp()
+ << ".\n" << logofs_flush;
+ #endif
+
+ T_timestamp startTs = getNewTimestamp();
+
+ T_timestamp nowTs = startTs;
+
+ int readable;
+ int remaining;
+
+ for (;;)
+ {
+ remaining = timeout - diffTimestamp(startTs, nowTs);
+
+ if (transport_ -> blocked() == 1)
+ {
+ #ifdef WARNING
+ *logofs << "handleWait: WARNING! Having to drain with "
+ << "channel " << "for FD#" << fd_ << " blocked.\n"
+ << logofs_flush;
+ #endif
+
+ handleDrain(0, remaining);
+
+ continue;
+ }
+
+ if (remaining <= 0)
+ {
+ #ifdef TEST
+ *logofs << "handleWait: Timeout raised while waiting "
+ << "for more data for FD#" << fd_ << " at "
+ << strMsTimestamp() << ".\n"
+ << logofs_flush;
+ #endif
+
+ return 0;
+ }
+
+ #ifdef TEST
+ *logofs << "handleWait: Waiting " << remaining << " Ms "
+ << "for a new message on FD#" << fd_
+ << ".\n" << logofs_flush;
+ #endif
+
+ readable = transport_ -> wait(remaining);
+
+ if (readable > 0)
+ {
+ #ifdef TEST
+ *logofs << "handleWait: WARNING! Encoding more data "
+ << "for FD#" << fd_ << " at " << strMsTimestamp()
+ << ".\n" << logofs_flush;
+ #endif
+
+ if (proxy -> handleAsyncRead(fd_) < 0)
+ {
+ return -1;
+ }
+
+ return 1;
+ }
+ else if (readable == -1)
+ {
+ return -1;
+ }
+
+ nowTs = getNewTimestamp();
+ }
+}
+
+int Channel::handleDrain(int limit, int timeout)
+{
+ #ifdef TEST
+ *logofs << "handleDrain: Going to drain FD#" << fd_
+ << " with a limit of " << limit << " bytes "
+ << "at " << strMsTimestamp() << ".\n"
+ << logofs_flush;
+ #endif
+
+ T_timestamp startTs = getNewTimestamp();
+
+ T_timestamp nowTs = startTs;
+
+ int drained;
+ int remaining;
+
+ int result;
+
+ for (;;)
+ {
+ remaining = timeout - diffTimestamp(startTs, nowTs);
+
+ if (remaining <= 0)
+ {
+ #ifdef TEST
+ *logofs << "handleDrain: Timeout raised while draining "
+ << "FD#" << fd_ << " at " << strMsTimestamp()
+ << ".\n" << logofs_flush;
+ #endif
+
+ result = 0;
+
+ goto ChannelDrainEnd;
+ }
+
+ #ifdef TEST
+ *logofs << "handleDrain: Trying to write to FD#"
+ << fd_ << " with " << remaining << " Ms "
+ << "remaining.\n" << logofs_flush;
+ #endif
+
+ drained = transport_ -> drain(limit, remaining);
+
+ if (drained == 1)
+ {
+ #ifdef TEST
+ *logofs << "handleDrain: Transport for FD#" << fd_
+ << " drained to " << transport_ -> length()
+ << " bytes at " << strMsTimestamp() << ".\n"
+ << logofs_flush;
+ #endif
+
+ result = 1;
+
+ goto ChannelDrainEnd;
+ }
+ else if (drained == 0 && transport_ -> readable() > 0)
+ {
+ #ifdef TEST
+ *logofs << "handleDrain: WARNING! Encoding more data "
+ << "for FD#" << fd_ << " at " << strMsTimestamp()
+ << ".\n" << logofs_flush;
+ #endif
+
+ if (proxy -> handleAsyncRead(fd_) < 0)
+ {
+ goto ChannelDrainError;
+ }
+ }
+ else if (drained == -1)
+ {
+ goto ChannelDrainError;
+ }
+
+ nowTs = getNewTimestamp();
+
+ if (diffTimestamp(startTs, nowTs) >= control -> ChannelTimeout)
+ {
+ int seconds = (remaining + control -> LatencyTimeout * 10) / 1000;
+
+ #ifdef WARNING
+ *logofs << "handleDrain: WARNING! Could not drain FD#"
+ << fd_ << " within " << seconds << " seconds.\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Warning" << ": Can't write to connection on FD#"
+ << fd_ << " since " << seconds << " seconds.\n";
+
+ if (alert_ == 0)
+ {
+ if (control -> ProxyMode == proxy_client)
+ {
+ alert_ = CLOSE_DEAD_X_CONNECTION_CLIENT_ALERT;
+ }
+ else
+ {
+ alert_ = CLOSE_DEAD_X_CONNECTION_SERVER_ALERT;
+ }
+
+ HandleAlert(alert_, 1);
+ }
+ }
+ }
+
+ChannelDrainEnd:
+
+ //
+ // Maybe we drained the channel and are
+ // now out of the congestion state.
+ //
+
+ handleCongestion();
+
+ return result;
+
+ChannelDrainError:
+
+ finish_ = 1;
+
+ return -1;
+}
+
+int Channel::handleCongestion()
+{
+ //
+ // Send a begin congestion control code
+ // if the local end of the channel does
+ // not consume its data.
+ //
+
+ if (isCongested() == 1)
+ {
+ if (congestion_ == 0)
+ {
+ #if defined(TEST) || defined(INFO)
+ *logofs << "handleCongestion: Sending congestion for FD#"
+ << fd_ << " with length " << transport_ -> length()
+ << " at " << strMsTimestamp() << ".\n"
+ << logofs_flush;
+ #endif
+
+ congestion_ = 1;
+
+ //
+ // Use the callback to send the control
+ // code immediately.
+ //
+
+ if (proxy -> handleAsyncCongestion(fd_) < 0)
+ {
+ finish_ = 1;
+
+ return -1;
+ }
+ }
+ }
+ else
+ {
+ //
+ // If the channel was in congestion state
+ // send an end congestion control code.
+ //
+
+ if (congestion_ == 1)
+ {
+ #if defined(TEST) || defined(INFO)
+ *logofs << "handleCongestion: Sending decongestion for FD#"
+ << fd_ << " with length " << transport_ -> length()
+ << " at " << strMsTimestamp() << ".\n"
+ << logofs_flush;
+ #endif
+
+ congestion_ = 0;
+
+ if (proxy -> handleAsyncDecongestion(fd_) < 0)
+ {
+ finish_ = 1;
+
+ return -1;
+ }
+ }
+
+ //
+ // Remove the "channel unresponsive"
+ // dialog.
+ //
+
+ if (alert_ != 0)
+ {
+ #if defined(TEST) || defined(INFO)
+ *logofs << "handleCongestion: Displacing the dialog "
+ << "for FD#" << fd_ << ".\n" << logofs_flush;
+ #endif
+
+ HandleAlert(DISPLACE_MESSAGE_ALERT, 1);
+ }
+ }
+
+ return 1;
+}
+
+int Channel::handleFlush(T_flush type, int bufferLength, int scratchLength)
+{
+ if (finish_ == 1)
+ {
+ #ifdef TEST
+ *logofs << "handleFlush: Not flushing data for "
+ << "finishing channel for FD#" << fd_
+ << ".\n" << logofs_flush;
+ #endif
+
+ writeBuffer_.fullReset();
+
+ return -1;
+ }
+
+ #ifdef TEST
+ *logofs << "handleFlush: Flushing " << bufferLength
+ << " + " << scratchLength << " bytes "
+ << "to FD#" << fd_ << ".\n"
+ << logofs_flush;
+ #endif
+
+ //
+ // Check if the channel has data available.
+ // Recent Linux kernels are very picky.
+ // They require that we read often or they
+ // assume that the process is non-interact-
+ // ive.
+ //
+
+ int result = 0;
+
+ if (handleAsyncEvents() < 0)
+ {
+ goto ChannelFlushError;
+ }
+
+ //
+ // Write the data in the main buffer first,
+ // followed by the data in the scratch buffer.
+ //
+
+ if (bufferLength > 0)
+ {
+ result = transport_ -> write(write_immediate,
+ writeBuffer_.getData(), bufferLength);
+ }
+
+ if (result >= 0 && scratchLength > 0)
+ {
+ result = transport_ -> write(write_immediate,
+ writeBuffer_.getScratchData(), scratchLength);
+ }
+
+ if (type == flush_if_any)
+ {
+ writeBuffer_.fullReset();
+ }
+ else
+ {
+ writeBuffer_.partialReset();
+ }
+
+ //
+ // If we failed to write to the X connection then
+ // set the finish flag. The caller should continue
+ // to handle all the remaining messages or it will
+ // corrupt the decode buffer. At the real end, an
+ // error will be propagated to the upper layers
+ // which will perform any needed cleanup.
+ //
+
+ if (result < 0)
+ {
+ goto ChannelFlushError;
+ }
+
+ //
+ // Reset transport buffers.
+ //
+
+ transport_ -> partialReset();
+
+ //
+ // Check if the X server has generated
+ // any event in response to our data.
+ //
+
+ if (handleAsyncEvents() < 0)
+ {
+ goto ChannelFlushError;
+ }
+
+ //
+ // Check if the channel has entered in
+ // congestion state and, in this case,
+ // send an immediate congestion control
+ // code to the remote.
+ //
+
+ handleCongestion();
+
+ //
+ // We could optionally drain the output
+ // buffer if this is X11 channel.
+ //
+ // if (isCongested() == 1 && isReliable() == 1)
+ // {
+ // if (handleDrain(0, control -> ChannelTimeout) < 0)
+ // {
+ // goto ChannelFlushError;
+ // }
+ // }
+ //
+
+ return 1;
+
+ChannelFlushError:
+
+ finish_ = 1;
+
+ return -1;
+}
+
+int Channel::handleFlush()
+{
+ #ifdef TEST
+ *logofs << "handleFlush: Flushing "
+ << transport_ -> length() << " bytes to FD#"
+ << fd_ << " with descriptor writable.\n"
+ << logofs_flush;
+ #endif
+
+ //
+ // Check if there is anything to read
+ // before anf after having written to
+ // the socket.
+ //
+
+ if (handleAsyncEvents() < 0)
+ {
+ goto ChannelFlushError;
+ }
+
+ if (transport_ -> flush() < 0)
+ {
+ #ifdef TEST
+ *logofs << "handleFlush: Failure detected "
+ << "flushing data to FD#" << fd_
+ << ".\n" << logofs_flush;
+ #endif
+
+ goto ChannelFlushError;
+ }
+
+ if (handleAsyncEvents() < 0)
+ {
+ goto ChannelFlushError;
+ }
+
+ //
+ // Reset channel's transport buffers.
+ //
+
+ transport_ -> partialReset();
+
+ //
+ // Check if the channel went out of the
+ // congestion state.
+ //
+
+ handleCongestion();
+
+ return 1;
+
+ChannelFlushError:
+
+ finish_ = 1;
+
+ return -1;
+}
+
+void Channel::handleResetAlert()
+{
+ if (alert_ != 0)
+ {
+ #ifdef TEST
+ *logofs << "handleResetAlert: The channel alert '"
+ << alert_ << "' was displaced.\n"
+ << logofs_flush;
+ #endif
+
+ alert_ = 0;
+ }
+}
+
+int Channel::handleCompress(EncodeBuffer &encodeBuffer, const unsigned char opcode,
+ const unsigned int offset, const unsigned char *buffer,
+ const unsigned int size, unsigned char *&compressedData,
+ unsigned int &compressedDataSize)
+{
+ if (size <= offset)
+ {
+ #ifdef DEBUG
+ *logofs << "handleCompress: Not compressing data for FD#" << fd_
+ << " as offset is " << offset << " with data size "
+ << size << ".\n" << logofs_flush;
+ #endif
+
+ return 0;
+ }
+
+ #ifdef DEBUG
+ *logofs << "handleCompress: Compressing data for FD#" << fd_
+ << " with data size " << size << " and offset "
+ << offset << ".\n" << logofs_flush;
+ #endif
+
+ //
+ // It is responsibility of the compressor to
+ // mark the buffer as such if the compression
+ // couldn't take place.
+ //
+
+ if (compressor_ -> compressBuffer(buffer + offset, size - offset, compressedData,
+ compressedDataSize, encodeBuffer) <= 0)
+ {
+ #ifdef DEBUG
+ *logofs << "handleCompress: Sent " << size - offset
+ << " bytes of plain data for FD#" << fd_
+ << ".\n" << logofs_flush;
+ #endif
+
+ return 0;
+ }
+ else
+ {
+ #ifdef DEBUG
+ *logofs << "handleCompress: Sent " << compressedDataSize
+ << " bytes of compressed data for FD#"
+ << fd_ << ".\n" << logofs_flush;
+ #endif
+
+ return 1;
+ }
+}
+
+int Channel::handleDecompress(DecodeBuffer &decodeBuffer, const unsigned char opcode,
+ const unsigned int offset, unsigned char *buffer,
+ const unsigned int size, const unsigned char *&compressedData,
+ unsigned int &compressedDataSize)
+{
+ if (size <= offset)
+ {
+ return 0;
+ }
+
+ int result = compressor_ -> decompressBuffer(buffer + offset, size - offset,
+ compressedData, compressedDataSize,
+ decodeBuffer);
+ if (result < 0)
+ {
+ #ifdef PANIC
+ *logofs << "handleDecompress: PANIC! Failed to decompress "
+ << size - offset << " bytes of data for FD#" << fd_
+ << " with OPCODE#" << (unsigned int) opcode << ".\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Data decompression failed for OPCODE#"
+ << (unsigned int) opcode << ".\n";
+
+ return -1;
+ }
+ else if (result == 0)
+ {
+ #ifdef DEBUG
+ *logofs << "handleDecompress: Received " << size - offset
+ << " bytes of plain data for FD#" << fd_
+ << ".\n" << logofs_flush;
+ #endif
+
+ return 0;
+ }
+ else
+ {
+ #ifdef DEBUG
+ *logofs << "handleDecompress: Received " << compressedDataSize
+ << " bytes of compressed data for FD#" << fd_
+ << ".\n" << logofs_flush;
+ #endif
+
+ return 1;
+ }
+}
+
+int Channel::handleCleanAndNullRequest(unsigned char &opcode, unsigned char *&buffer,
+ unsigned int &size)
+{
+ #ifdef TEST
+ *logofs << "handleCleanAndNullRequest: Removing the previous data "
+ << "and sending an X_NoOperation " << "for FD#" << fd_
+ << " due to OPCODE#" << (unsigned int) opcode << " ("
+ << DumpOpcode(opcode) << ").\n" << logofs_flush;
+ #endif
+
+ writeBuffer_.removeMessage(size - 4);
+
+ size = 4;
+ opcode = X_NoOperation;
+
+ return 1;
+}
+
+int Channel::handleNullRequest(unsigned char &opcode, unsigned char *&buffer,
+ unsigned int &size)
+{
+ #ifdef TEST
+ *logofs << "handleNullRequest: Sending an X_NoOperation for FD#"
+ << fd_ << " due to OPCODE#" << (unsigned int) opcode
+ << " (" << DumpOpcode(opcode) << ").\n"
+ << logofs_flush;
+ #endif
+
+ size = 4;
+ buffer = writeBuffer_.addMessage(size);
+ opcode = X_NoOperation;
+
+ return 1;
+}
+
+void Channel::handleSplitStoreError(int resource)
+{
+ if (resource < 0 || resource >= CONNECTIONS_LIMIT)
+ {
+ #ifdef PANIC
+ *logofs << "handleSplitStoreError: PANIC! Resource "
+ << resource << " is out of range with limit "
+ << "set to " << CONNECTIONS_LIMIT << ".\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Resource " << resource
+ << " is out of range with limit set to "
+ << CONNECTIONS_LIMIT << ".\n";
+
+ HandleCleanup();
+ }
+ else
+ {
+ #ifdef PANIC
+ *logofs << "handleSplitStoreError: PANIC! Cannot "
+ << "allocate the split store for resource "
+ << resource << ".\n" << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Cannot allocate the "
+ << "split store for resource " << resource
+ << ".\n";
+
+ HandleCleanup();
+ }
+}
+
+void Channel::handleSplitStoreAlloc(List *list, int resource)
+{
+ if (resource < 0 || resource >= CONNECTIONS_LIMIT)
+ {
+ handleSplitStoreError(resource);
+ }
+
+ if (clientStore_ -> getSplitStore(resource) == NULL)
+ {
+ #if defined(TEST) || defined(SPLIT)
+ *logofs << "handleSplitStoreAlloc: Allocating a new "
+ << "split store for resource " << resource
+ << ".\n" << logofs_flush;
+ #endif
+
+ SplitStore *splitStore = clientStore_ -> createSplitStore(resource);
+
+ if (splitStore == NULL)
+ {
+ handleSplitStoreError(resource);
+ }
+
+ list -> add(resource);
+ }
+ #if defined(TEST) || defined(SPLIT)
+ else
+ {
+ //
+ // Old proxy versions only use a single
+ // split store.
+ //
+
+ if (resource != 0)
+ {
+ *logofs << "handleSplitStoreAlloc: WARNING! A split "
+ << "store for resource " << resource
+ << " already exists.\n" << logofs_flush;
+ }
+ }
+ #endif
+}
+
+void Channel::handleSplitStoreRemove(List *list, int resource)
+{
+ if (resource < 0 || resource >= CONNECTIONS_LIMIT)
+ {
+ handleSplitStoreError(resource);
+ }
+
+ SplitStore *splitStore = clientStore_ -> getSplitStore(resource);
+
+ if (splitStore != NULL)
+ {
+ #if defined(TEST) || defined(SPLIT)
+ *logofs << "handleSplitStoreRemove: Deleting the "
+ << "split store for resource " << resource
+ << ".\n" << logofs_flush;
+ #endif
+
+ clientStore_ -> destroySplitStore(resource);
+
+ #if defined(TEST) || defined(SPLIT)
+ *logofs << "handleSplitStoreRemove: Deleting resource "
+ << resource << " from the list " << ".\n"
+ << logofs_flush;
+ #endif
+
+ list -> remove(resource);
+ }
+ #if defined(TEST) || defined(SPLIT)
+ else
+ {
+ *logofs << "handleSplitStoreRemove: WARNING! A split "
+ << "store for resource " << resource
+ << " does not exist.\n" << logofs_flush;
+ }
+ #endif
+}
+
+Split *Channel::handleSplitCommitRemove(int request, int resource, int position)
+{
+ #if defined(TEST) || defined(SPLIT)
+ *logofs << "handleSplitCommitRemove: SPLIT! Checking split "
+ << "commit with resource " << resource << " request "
+ << request << " and position " << position
+ << ".\n" << logofs_flush;
+ #endif
+
+ //
+ // Remove the split from the split queue.
+ //
+
+ CommitStore *commitStore = clientStore_ -> getCommitStore();
+
+ Split *split = commitStore -> pop();
+
+ if (split == NULL)
+ {
+ #ifdef PANIC
+ *logofs << "handleSplitCommitRemove: PANIC! Can't "
+ << "find the split in the commit queue.\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Can't find the "
+ << "split in the commit queue.\n";
+
+ HandleCleanup();
+ }
+
+ #if defined(TEST) || defined(SPLIT)
+ *logofs << "handleSplitCommitRemove: SPLIT! Element from "
+ << "the queue has resource " << split -> getResource()
+ << " request " << split -> getRequest() << " and "
+ << "position " << split -> getPosition()
+ << ".\n" << logofs_flush;
+ #endif
+
+ if (control -> isProtoStep7() == 1 &&
+ (resource != split -> getResource() ||
+ request != split -> getRequest() ||
+ position != split -> getPosition()) ||
+ (request != split -> getRequest() ||
+ position != split -> getPosition()))
+ {
+ #ifdef PANIC
+ *logofs << "handleSplitCommitRemove: PANIC! The data in "
+ << "the split doesn't match the commit request.\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": The data in the split doesn't "
+ << "match the commit request.\n";
+
+ return NULL;
+ }
+
+ #if defined(TEST) || defined(SPLIT)
+
+ commitStore -> dump();
+
+ #endif
+
+ return split;
+}
+
+int Channel::setReferences()
+{
+ #ifdef TEST
+ *logofs << "Channel: Initializing the static "
+ << "members for the base class.\n"
+ << logofs_flush;
+ #endif
+
+ firstClient_ = -1;
+
+ fontPort_ = -1;
+
+ #ifdef REFERENCES
+
+ references_ = 0;
+
+ #endif
+
+ return 1;
+}
+
+int Channel::setOpcodes(OpcodeStore *opcodeStore)
+{
+ opcodeStore_ = opcodeStore;
+
+ #ifdef TEST
+ *logofs << "setOpcodes: Propagated opcodes store to channel "
+ << "for FD#" << fd_ << ".\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+int Channel::setStores(ClientStore *clientStore, ServerStore *serverStore)
+{
+ clientStore_ = clientStore;
+ serverStore_ = serverStore;
+
+ #ifdef TEST
+ *logofs << "setStores: Propagated message stores to channel "
+ << "for FD#" << fd_ << ".\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+int Channel::setCaches(ClientCache *clientCache, ServerCache *serverCache)
+{
+ clientCache_ = clientCache;
+ serverCache_ = serverCache;
+
+ #ifdef TEST
+ *logofs << "setCaches: Propagated encode caches to channel "
+ << "for FD#" << fd_ << ".\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-23 14:59:10 +0000