--- /dev/null
+/* -*- c-basic-offset: 8 -*-
+ rdesktop: A Remote Desktop Protocol client.
+ Protocol services - Virtual channels
+ Copyright (C) Erik Forsberg <forsberg@cendio.se> 2003
+ Copyright (C) Matthew Chapman 2003
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "rdesktop.h"
+
+#define MAX_CHANNELS 4
+#define CHANNEL_CHUNK_LENGTH 1600
+#define CHANNEL_FLAG_FIRST 0x01
+#define CHANNEL_FLAG_LAST 0x02
+#define CHANNEL_FLAG_SHOW_PROTOCOL 0x10
+
+extern BOOL g_use_rdp5;
+extern BOOL g_encryption;
+
+VCHANNEL g_channels[MAX_CHANNELS];
+unsigned int g_num_channels;
+
+/* FIXME: We should use the information in TAG_SRV_CHANNELS to map RDP5
+ channels to MCS channels.
+
+ The format of TAG_SRV_CHANNELS seems to be
+
+ global_channel_no (uint16le)
+ number_of_other_channels (uint16le)
+ ..followed by uint16les for the other channels.
+*/
+
+VCHANNEL *
+channel_register(char *name, uint32 flags, void (*callback) (STREAM))
+{
+ VCHANNEL *channel;
+
+ if (g_num_channels >= MAX_CHANNELS)
+ {
+ error("Channel table full, increase MAX_CHANNELS\n");
+ return NULL;
+ }
+
+ channel = &g_channels[g_num_channels];
+ channel->mcs_id = MCS_GLOBAL_CHANNEL + 1 + g_num_channels;
+ strncpy(channel->name, name, 8);
+ channel->flags = flags;
+ channel->process = callback;
+ g_num_channels++;
+ return channel;
+}
+
+STREAM
+channel_init(VCHANNEL * channel, uint32 length)
+{
+ STREAM s;
+
+ s = sec_init(/*g_encryption ? SEC_ENCRYPT :*/ 0, length + 8);
+ s_push_layer(s, channel_hdr, 8);
+ return s;
+}
+
+void
+channel_send(STREAM s, VCHANNEL * channel)
+{
+ uint32 length, flags;
+ uint32 thislength, remaining;
+ uint8 *data;
+
+ /* first fragment sent in-place */
+ s_pop_layer(s, channel_hdr);
+ length = s->end - s->p - 8;
+
+ DEBUG_CLIPBOARD(("channel_send, length = %d\n", length));
+
+ thislength = MIN(length, CHANNEL_CHUNK_LENGTH);
+/* Note: In the original clipboard implementation, this number was
+ 1592, not 1600. However, I don't remember the reason and 1600 seems
+ to work so.. This applies only to *this* length, not the length of
+ continuation or ending packets. */
+ remaining = length - thislength;
+ flags = (remaining == 0) ? CHANNEL_FLAG_FIRST | CHANNEL_FLAG_LAST : CHANNEL_FLAG_FIRST;
+ if (channel->flags & CHANNEL_OPTION_SHOW_PROTOCOL)
+ flags |= CHANNEL_FLAG_SHOW_PROTOCOL;
+
+ out_uint32_le(s, length);
+ out_uint32_le(s, flags);
+ data = s->end = s->p + thislength;
+ DEBUG_CLIPBOARD(("Sending %d bytes with FLAG_FIRST\n", thislength));
+ sec_send_to_channel(s, /*g_encryption ? SEC_ENCRYPT :*/ 0, channel->mcs_id);
+
+ /* subsequent segments copied (otherwise would have to generate headers backwards) */
+ while (remaining > 0)
+ {
+ thislength = MIN(remaining, CHANNEL_CHUNK_LENGTH);
+ remaining -= thislength;
+ flags = (remaining == 0) ? CHANNEL_FLAG_LAST : 0;
+ if (channel->flags & CHANNEL_OPTION_SHOW_PROTOCOL)
+ flags |= CHANNEL_FLAG_SHOW_PROTOCOL;
+
+ DEBUG_CLIPBOARD(("Sending %d bytes with flags %d\n", thislength, flags));
+
+ s = sec_init(/*g_encryption ? SEC_ENCRYPT : */0, thislength + 8);
+ out_uint32_le(s, length);
+ out_uint32_le(s, flags);
+ out_uint8p(s, data, thislength);
+ s_mark_end(s);
+ sec_send_to_channel(s, /*g_encryption ? SEC_ENCRYPT : */0, channel->mcs_id);
+
+ data += thislength;
+ }
+}
+
+void
+channel_process(STREAM s, uint16 mcs_channel)
+{
+ uint32 length, flags;
+ uint32 thislength;
+ VCHANNEL *channel = NULL;
+ unsigned int i;
+ STREAM in;
+
+ for (i = 0; i < g_num_channels; i++)
+ {
+ channel = &g_channels[i];
+ if (channel->mcs_id == mcs_channel)
+ break;
+ }
+
+ if (i >= g_num_channels)
+ return;
+
+ in_uint32_le(s, length);
+ in_uint32_le(s, flags);
+ if ((flags & CHANNEL_FLAG_FIRST) && (flags & CHANNEL_FLAG_LAST))
+ {
+ /* single fragment - pass straight up */
+ channel->process(s);
+ }
+ else
+ {
+ /* add fragment to defragmentation buffer */
+ in = &channel->in;
+ if (flags & CHANNEL_FLAG_FIRST)
+ {
+ if (length > in->size)
+ {
+ in->data = xrealloc(in->data, length);
+ in->size = length;
+ }
+ in->p = in->data;
+ }
+
+ thislength = MIN(s->end - s->p, in->data + in->size - in->p);
+ memcpy(in->p, s->p, thislength);
+ in->p += thislength;
+
+ if (flags & CHANNEL_FLAG_LAST)
+ {
+ in->end = in->p;
+ in->p = in->data;
+ channel->process(in);
+ }
+ }
+}
projects / rdpsrv / blobdiff