From 12ed9b1002fea166e6622ff0a5669bdfd9b3bbf0 Mon Sep 17 00:00:00 2001
From: jsorg71 <jsorg71>
Date: Sun, 25 Jul 2004 03:42:40 +0000
Subject: [PATCH] added xrdp_mcs.c

---
 xrdp/xrdp_mcs.c | 401 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 401 insertions(+)
 create mode 100644 xrdp/xrdp_mcs.c

diff --git a/xrdp/xrdp_mcs.c b/xrdp/xrdp_mcs.c
new file mode 100644
index 00000000..366f4b46
--- /dev/null
+++ b/xrdp/xrdp_mcs.c
@@ -0,0 +1,401 @@
+/*
+   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.
+
+   Copyright (C) Jay Sorg 2004
+
+   mcs layer
+
+*/
+
+#include "xrdp.h"
+
+/*****************************************************************************/
+struct xrdp_mcs* xrdp_mcs_create(struct xrdp_sec* owner)
+{
+  struct xrdp_mcs* self;
+
+  self = (struct xrdp_mcs*)g_malloc(sizeof(struct xrdp_mcs), 1);
+  self->owner = owner;
+  self->in_s = owner->in_s;
+  self->out_s = owner->out_s;
+  self->userid = 1;
+  self->chanid = 1001;
+  self->client_mcs_data = &owner->client_mcs_data;
+  self->server_mcs_data = &owner->server_mcs_data;
+  self->iso_layer = xrdp_iso_create(self);
+  return self;
+}
+
+/*****************************************************************************/
+void xrdp_mcs_delete(struct xrdp_mcs* self)
+{
+  xrdp_iso_delete(self->iso_layer);
+  g_free(self);
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_recv(struct xrdp_mcs* self)
+{
+  int appid;
+  int opcode;
+  int len;
+
+  if (xrdp_iso_recv(self->iso_layer) != 0)
+    return 1;
+  in_uint8(self->in_s, opcode);
+  appid = opcode >> 2;
+  if (appid != MCS_SDRQ)
+    return 1;
+  in_uint8s(self->in_s, 5);
+  in_uint8(self->in_s, len);
+  if (len & 0x80)
+    in_uint8s(self->in_s, 1);
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_ber_parse_header(struct xrdp_mcs* self, int tag_val, int* len)
+{
+  int tag;
+  int l;
+
+  if (tag_val > 0xff)
+  {
+    in_uint16_be(self->in_s, tag);
+  }
+  else
+  {
+    in_uint8(self->in_s, tag);
+  }
+  if (tag != tag_val)
+    return 1;
+  in_uint8(self->in_s, l);
+  if (l & 0x80)
+  {
+    l = l & ~0x80;
+    *len = 0;
+    while (l > 0)
+    {
+      next_be(self->in_s, *len);
+      l--;
+    }
+  }
+  else
+    *len = l;
+  if (s_check(self->in_s))
+    return 0;
+  else
+    return 1;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_parse_domain_params(struct xrdp_mcs* self)
+{
+  int len;
+
+  if (xrdp_mcs_ber_parse_header(self, MCS_TAG_DOMAIN_PARAMS, &len) != 0)
+    return 1;
+  in_uint8s(self->in_s, len);
+  if (s_check(self->in_s))
+    return 0;
+  else
+    return 1;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_recv_connect_initial(struct xrdp_mcs* self)
+{
+  int len;
+
+  if (xrdp_iso_recv(self->iso_layer) != 0)
+    return 1;
+  if (xrdp_mcs_ber_parse_header(self, MCS_CONNECT_INITIAL, &len) != 0)
+    return 1;
+  if (xrdp_mcs_ber_parse_header(self, BER_TAG_OCTET_STRING, &len) != 0)
+    return 1;
+  in_uint8s(self->in_s, len);
+  if (xrdp_mcs_ber_parse_header(self, BER_TAG_OCTET_STRING, &len) != 0)
+    return 1;
+  in_uint8s(self->in_s, len);
+  if (xrdp_mcs_ber_parse_header(self, BER_TAG_BOOLEAN, &len) != 0)
+    return 1;
+  in_uint8s(self->in_s, len);
+  if (xrdp_mcs_parse_domain_params(self) != 0)
+    return 1;
+  if (xrdp_mcs_parse_domain_params(self) != 0)
+    return 1;
+  if (xrdp_mcs_parse_domain_params(self) != 0)
+    return 1;
+  if (xrdp_mcs_ber_parse_header(self, BER_TAG_OCTET_STRING, &len) != 0)
+    return 1;
+  /* make a copy of client mcs data */
+  init_stream(self->client_mcs_data, len);
+  out_uint8a(self->client_mcs_data, self->in_s->p, len);
+  in_uint8s(self->in_s, len);
+  s_mark_end(self->client_mcs_data);
+  if (s_check_end(self->in_s))
+    return 0;
+  else
+    return 1;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_recv_edrq(struct xrdp_mcs* self)
+{
+  int opcode;
+
+  if (xrdp_iso_recv(self->iso_layer) != 0)
+    return 1;
+  in_uint8(self->in_s, opcode);
+  if ((opcode >> 2) != MCS_EDRQ)
+    return 1;
+  in_uint8s(self->in_s, 2);
+  in_uint8s(self->in_s, 2);
+  if (opcode & 2)
+  {
+    in_uint16_be(self->in_s, self->userid);
+  }
+  if (!(s_check_end(self->in_s)))
+    return 1;
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_recv_aurq(struct xrdp_mcs* self)
+{
+  int opcode;
+
+  if (xrdp_iso_recv(self->iso_layer) != 0)
+    return 1;
+  in_uint8(self->in_s, opcode);
+  if ((opcode >> 2) != MCS_AURQ)
+    return 1;
+  if (opcode & 2)
+  {
+    in_uint16_be(self->in_s, self->userid);
+  }
+  if (!(s_check_end(self->in_s)))
+    return 1;
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_send_aucf(struct xrdp_mcs* self)
+{
+  if (xrdp_iso_init(self->iso_layer, 4) != 0)
+    return 1;
+  out_uint8(self->out_s, (MCS_AUCF << 2) | 2);
+  out_uint8s(self->out_s, 1);
+  out_uint16_be(self->out_s, self->userid);
+  s_mark_end(self->out_s);
+  if (xrdp_iso_send(self->iso_layer) != 0)
+    return 1;
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_recv_cjrq(struct xrdp_mcs* self)
+{
+  int opcode;
+
+  if (xrdp_iso_recv(self->iso_layer) != 0)
+    return 1;
+  in_uint8(self->in_s, opcode);
+  if ((opcode >> 2) != MCS_CJRQ)
+    return 1;
+  in_uint8s(self->in_s, 4);
+  if (opcode & 2)
+  {
+    in_uint8s(self->in_s, 2);
+  }
+  if (!(s_check_end(self->in_s)))
+    return 1;
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_send_cjcf(struct xrdp_mcs* self, int chanid)
+{
+  if (xrdp_iso_init(self->iso_layer, 8) != 0)
+    return 1;
+  out_uint8(self->out_s, (MCS_CJCF << 2) | 2);
+  out_uint8(self->out_s, 0);
+  out_uint16_be(self->out_s, self->userid);
+  out_uint16_be(self->out_s, chanid);
+  out_uint16_be(self->out_s, chanid);
+  s_mark_end(self->out_s);
+  if (xrdp_iso_send(self->iso_layer) != 0)
+    return 1;
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_ber_out_header(struct xrdp_mcs* self, int tag_val, int len)
+{
+  if (tag_val > 0xff)
+  {
+    out_uint16_be(self->out_s, tag_val);
+  }
+  else
+  {
+    out_uint8(self->out_s, tag_val);
+  }
+  if (len >= 0x80)
+  {
+    out_uint8(self->out_s, 0x82);
+    out_uint16_be(self->out_s, len);
+  }
+  else
+  {
+    out_uint8(self->out_s, len);
+  }
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_ber_out_int8(struct xrdp_mcs* self, int value)
+{
+  xrdp_mcs_ber_out_header(self, BER_TAG_INTEGER, 1);
+  out_uint8(self->out_s, value);
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_ber_out_int16(struct xrdp_mcs* self, int value)
+{
+  xrdp_mcs_ber_out_header(self, BER_TAG_INTEGER, 2);
+  out_uint8(self->out_s, value >> 8);
+  out_uint8(self->out_s, value);
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_ber_out_int24(struct xrdp_mcs* self, int value)
+{
+  xrdp_mcs_ber_out_header(self, BER_TAG_INTEGER, 3);
+  out_uint8(self->out_s, value >> 16);
+  out_uint8(self->out_s, value >> 8);
+  out_uint8(self->out_s, value);
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_out_domain_params(struct xrdp_mcs* self, int max_channels,
+                               int max_users, int max_tokens,
+                               int max_pdu_size)
+{
+  xrdp_mcs_ber_out_header(self, MCS_TAG_DOMAIN_PARAMS, 26);
+  xrdp_mcs_ber_out_int8(self, max_channels);
+  xrdp_mcs_ber_out_int8(self, max_users);
+  xrdp_mcs_ber_out_int8(self, max_tokens);
+  xrdp_mcs_ber_out_int8(self, 1);
+  xrdp_mcs_ber_out_int8(self, 0);
+  xrdp_mcs_ber_out_int8(self, 1);
+  xrdp_mcs_ber_out_int24(self, max_pdu_size);
+  xrdp_mcs_ber_out_int8(self, 2);
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_send_connect_response(struct xrdp_mcs* self)
+{
+  int data_len;
+
+  data_len = self->server_mcs_data->end - self->server_mcs_data->data;
+  xrdp_iso_init(self->iso_layer, 512);
+  xrdp_mcs_ber_out_header(self, MCS_CONNECT_RESPONSE, 313);
+  xrdp_mcs_ber_out_header(self, BER_TAG_RESULT, 1);
+  out_uint8(self->out_s, 0);
+  xrdp_mcs_ber_out_header(self, BER_TAG_INTEGER, 1);
+  out_uint8(self->out_s, 0);
+  xrdp_mcs_out_domain_params(self, 2, 2, 0, 0xffff);
+  xrdp_mcs_ber_out_header(self, BER_TAG_OCTET_STRING, data_len);
+  /* mcs data */
+  out_uint8a(self->out_s, self->server_mcs_data->data, data_len);
+  s_mark_end(self->out_s);
+  if (xrdp_iso_send(self->iso_layer) != 0)
+    return 1;
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_incoming(struct xrdp_mcs* self)
+{
+  if (xrdp_iso_incoming(self->iso_layer) != 0)
+    return 1;
+  if (xrdp_mcs_recv_connect_initial(self) != 0)
+    return 1;
+  if (xrdp_mcs_send_connect_response(self) != 0)
+    return 1;
+  if (xrdp_mcs_recv_edrq(self) != 0)
+    return 1;
+  if (xrdp_mcs_recv_aurq(self) != 0)
+    return 1;
+  if (xrdp_mcs_send_aucf(self) != 0)
+    return 1;
+  if (xrdp_mcs_recv_cjrq(self) != 0)
+    return 1;
+  if (xrdp_mcs_send_cjcf(self, self->userid + MCS_USERCHANNEL_BASE) != 0)
+    return 1;
+  if (xrdp_mcs_recv_cjrq(self) != 0)
+    return 1;
+  if (xrdp_mcs_send_cjcf(self, MCS_GLOBAL_CHANNEL) != 0)
+    return 1;
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_init(struct xrdp_mcs* self, int len)
+{
+  xrdp_iso_init(self->iso_layer, len + 8);
+  s_push_layer(self->out_s, mcs_hdr, 8);
+  return 0;
+}
+
+/*****************************************************************************/
+/* returns error */
+int xrdp_mcs_send(struct xrdp_mcs* self)
+{
+  int len;
+
+  s_pop_layer(self->out_s, mcs_hdr);
+  len = (self->out_s->end - self->out_s->p) - 8;
+  len = len | 0x8000;
+  out_uint8(self->out_s, MCS_SDIN << 2);
+  out_uint16_be(self->out_s, self->userid);
+  out_uint16_be(self->out_s, MCS_GLOBAL_CHANNEL);
+  out_uint8(self->out_s, 0x70);
+  out_uint16_be(self->out_s, len);
+  if (xrdp_iso_send(self->iso_layer) != 0)
+    return 1;
+  return 0;
+}