630 lines
13 KiB
C
630 lines
13 KiB
C
/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2004-2005
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mcs layer
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*/
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#include "libxrdp.h"
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/*****************************************************************************/
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struct xrdp_mcs* APP_CC
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xrdp_mcs_create(struct xrdp_sec* owner, int sck,
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struct stream* client_mcs_data,
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struct stream* server_mcs_data)
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{
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struct xrdp_mcs* self;
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self = (struct xrdp_mcs*)g_malloc(sizeof(struct xrdp_mcs), 1);
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self->sec_layer = owner;
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self->userid = 1;
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self->chanid = 1001;
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self->client_mcs_data = client_mcs_data;
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self->server_mcs_data = server_mcs_data;
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self->iso_layer = xrdp_iso_create(self, sck);
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return self;
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}
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/*****************************************************************************/
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void APP_CC
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xrdp_mcs_delete(struct xrdp_mcs* self)
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{
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if (self == 0)
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{
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return;
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}
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xrdp_iso_delete(self->iso_layer);
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g_free(self);
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_send_cjcf(struct xrdp_mcs* self, int chanid)
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{
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struct stream* s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_init(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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out_uint8(s, (MCS_CJCF << 2) | 2);
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out_uint8(s, 0);
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out_uint16_be(s, self->userid);
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out_uint16_be(s, chanid);
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out_uint16_be(s, chanid);
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s_mark_end(s);
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if (xrdp_iso_send(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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int APP_CC
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xrdp_mcs_recv(struct xrdp_mcs* self, struct stream* s, int* chan)
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{
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int appid;
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int opcode;
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int len;
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DEBUG((" in xrdp_mcs_recv\n\r"));
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while (1)
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{
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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DEBUG((" out xrdp_mcs_recv xrdp_iso_recv returned non zero\n\r"));
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return 1;
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}
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in_uint8(s, opcode);
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appid = opcode >> 2;
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if (appid == MCS_DPUM)
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{
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DEBUG((" out xrdp_mcs_recv appid != MCS_DPUM\n\r"));
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return 1;
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}
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if (appid == MCS_CJRQ)
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{
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xrdp_mcs_send_cjcf(self, self->userid + MCS_USERCHANNEL_BASE);
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continue;
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}
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break;
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}
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if (appid != MCS_SDRQ)
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{
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DEBUG((" out xrdp_mcs_recv err got 0x%x need MCS_SDRQ\n\r", appid));
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return 1;
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}
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in_uint8s(s, 2);
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in_uint16_be(s, *chan);
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in_uint8s(s, 1);
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in_uint8(s, len);
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if (len & 0x80)
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{
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in_uint8s(s, 1);
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}
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DEBUG((" out xrdp_mcs_recv\n\r"));
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_parse_header(struct xrdp_mcs* self, struct stream* s,
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int tag_val, int* len)
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{
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int tag;
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int l;
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int i;
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if (tag_val > 0xff)
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{
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in_uint16_be(s, tag);
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}
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else
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{
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in_uint8(s, tag);
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}
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if (tag != tag_val)
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{
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return 1;
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}
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in_uint8(s, l);
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if (l & 0x80)
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{
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l = l & ~0x80;
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*len = 0;
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while (l > 0)
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{
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in_uint8(s, i);
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*len = (*len << 8) | i;
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l--;
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}
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}
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else
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{
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*len = l;
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}
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if (s_check(s))
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{
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return 0;
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}
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else
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{
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return 1;
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}
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_parse_domain_params(struct xrdp_mcs* self, struct stream* s)
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{
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int len;
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if (xrdp_mcs_ber_parse_header(self, s, MCS_TAG_DOMAIN_PARAMS, &len) != 0)
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{
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return 1;
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}
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in_uint8s(s, len);
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if (s_check(s))
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{
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return 0;
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}
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else
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{
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return 1;
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}
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_recv_connect_initial(struct xrdp_mcs* self)
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{
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int len;
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struct stream* s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_ber_parse_header(self, s, MCS_CONNECT_INITIAL, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, len);
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if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, len);
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if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_BOOLEAN, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, len);
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if (xrdp_mcs_parse_domain_params(self, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_parse_domain_params(self, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_parse_domain_params(self, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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if (xrdp_mcs_ber_parse_header(self, s, BER_TAG_OCTET_STRING, &len) != 0)
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{
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free_stream(s);
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return 1;
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}
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/* make a copy of client mcs data */
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init_stream(self->client_mcs_data, len);
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out_uint8a(self->client_mcs_data, s->p, len);
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in_uint8s(s, len);
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s_mark_end(self->client_mcs_data);
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if (s_check_end(s))
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{
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free_stream(s);
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return 0;
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}
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else
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{
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free_stream(s);
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return 1;
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}
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_recv_edrq(struct xrdp_mcs* self)
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{
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int opcode;
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struct stream* s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8(s, opcode);
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if ((opcode >> 2) != MCS_EDRQ)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, 2);
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in_uint8s(s, 2);
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if (opcode & 2)
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{
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in_uint16_be(s, self->userid);
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}
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if (!(s_check_end(s)))
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_recv_aurq(struct xrdp_mcs* self)
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{
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int opcode;
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struct stream* s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8(s, opcode);
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if ((opcode >> 2) != MCS_AURQ)
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{
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free_stream(s);
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return 1;
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}
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if (opcode & 2)
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{
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in_uint16_be(s, self->userid);
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}
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if (!(s_check_end(s)))
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_send_aucf(struct xrdp_mcs* self)
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{
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struct stream* s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_init(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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out_uint8(s, ((MCS_AUCF << 2) | 2));
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out_uint8s(s, 1);
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out_uint16_be(s, self->userid);
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s_mark_end(s);
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if (xrdp_iso_send(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_recv_cjrq(struct xrdp_mcs* self)
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{
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int opcode;
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struct stream* s;
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make_stream(s);
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init_stream(s, 8192);
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if (xrdp_iso_recv(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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in_uint8(s, opcode);
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if ((opcode >> 2) != MCS_CJRQ)
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{
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free_stream(s);
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return 1;
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}
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in_uint8s(s, 4);
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if (opcode & 2)
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{
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in_uint8s(s, 2);
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}
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if (!(s_check_end(s)))
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_out_header(struct xrdp_mcs* self, struct stream* s,
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int tag_val, int len)
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{
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if (tag_val > 0xff)
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{
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out_uint16_be(s, tag_val);
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}
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else
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{
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out_uint8(s, tag_val);
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}
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if (len >= 0x80)
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{
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out_uint8(s, 0x82);
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out_uint16_be(s, len);
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}
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else
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{
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out_uint8(s, len);
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}
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_out_int8(struct xrdp_mcs* self, struct stream* s, int value)
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{
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xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 1);
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out_uint8(s, value);
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return 0;
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}
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#if 0 /* not used */
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_out_int16(struct xrdp_mcs* self, struct stream* s, int value)
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{
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xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 2);
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out_uint8(s, (value >> 8));
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out_uint8(s, value);
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return 0;
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}
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#endif
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_ber_out_int24(struct xrdp_mcs* self, struct stream* s, int value)
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{
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xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 3);
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out_uint8(s, (value >> 16));
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out_uint8(s, (value >> 8));
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out_uint8(s, value);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_out_domain_params(struct xrdp_mcs* self, struct stream* s,
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int max_channels,
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int max_users, int max_tokens,
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int max_pdu_size)
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{
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xrdp_mcs_ber_out_header(self, s, MCS_TAG_DOMAIN_PARAMS, 26);
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xrdp_mcs_ber_out_int8(self, s, max_channels);
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xrdp_mcs_ber_out_int8(self, s, max_users);
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xrdp_mcs_ber_out_int8(self, s, max_tokens);
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xrdp_mcs_ber_out_int8(self, s, 1);
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xrdp_mcs_ber_out_int8(self, s, 0);
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xrdp_mcs_ber_out_int8(self, s, 1);
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xrdp_mcs_ber_out_int24(self, s, max_pdu_size);
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xrdp_mcs_ber_out_int8(self, s, 2);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_mcs_send_connect_response(struct xrdp_mcs* self)
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{
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int data_len;
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struct stream* s;
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make_stream(s);
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init_stream(s, 8192);
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data_len = self->server_mcs_data->end - self->server_mcs_data->data;
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xrdp_iso_init(self->iso_layer, s);
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xrdp_mcs_ber_out_header(self, s, MCS_CONNECT_RESPONSE, 313);
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xrdp_mcs_ber_out_header(self, s, BER_TAG_RESULT, 1);
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out_uint8(s, 0);
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xrdp_mcs_ber_out_header(self, s, BER_TAG_INTEGER, 1);
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out_uint8(s, 0);
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xrdp_mcs_out_domain_params(self, s, 2, 2, 0, 0xffff);
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xrdp_mcs_ber_out_header(self, s, BER_TAG_OCTET_STRING, data_len);
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/* mcs data */
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out_uint8a(s, self->server_mcs_data->data, data_len);
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s_mark_end(s);
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if (xrdp_iso_send(self->iso_layer, s) != 0)
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{
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free_stream(s);
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return 1;
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}
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free_stream(s);
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return 0;
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}
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/*****************************************************************************/
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/* returns error */
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int APP_CC
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xrdp_mcs_incoming(struct xrdp_mcs* self)
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{
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DEBUG((" in xrdp_mcs_incoming\n\r"));
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if (xrdp_iso_incoming(self->iso_layer) != 0)
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{
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return 1;
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}
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if (xrdp_mcs_recv_connect_initial(self) != 0)
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{
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return 1;
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}
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if (xrdp_mcs_send_connect_response(self) != 0)
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{
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return 1;
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}
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if (xrdp_mcs_recv_edrq(self) != 0)
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{
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return 1;
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}
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if (xrdp_mcs_recv_aurq(self) != 0)
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{
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return 1;
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}
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if (xrdp_mcs_send_aucf(self) != 0)
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{
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return 1;
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}
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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;
|
|
}
|
|
DEBUG((" out xrdp_mcs_incoming\n\r"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_init(struct xrdp_mcs* self, struct stream* s)
|
|
{
|
|
xrdp_iso_init(self->iso_layer, s);
|
|
s_push_layer(s, mcs_hdr, 8);
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_send(struct xrdp_mcs* self, struct stream* s)
|
|
{
|
|
int len;
|
|
|
|
DEBUG((" in xrdp_mcs_send\n\r"));
|
|
s_pop_layer(s, mcs_hdr);
|
|
len = (s->end - s->p) - 8;
|
|
len = len | 0x8000;
|
|
out_uint8(s, MCS_SDIN << 2);
|
|
out_uint16_be(s, self->userid);
|
|
out_uint16_be(s, MCS_GLOBAL_CHANNEL);
|
|
out_uint8(s, 0x70);
|
|
out_uint16_be(s, len);
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
return 1;
|
|
}
|
|
DEBUG((" out xrdp_mcs_send\n\r"));
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns error */
|
|
int APP_CC
|
|
xrdp_mcs_disconnect(struct xrdp_mcs* self)
|
|
{
|
|
struct stream* s;
|
|
|
|
make_stream(s);
|
|
init_stream(s, 8192);
|
|
if (xrdp_iso_init(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
out_uint8(s, (MCS_DPUM << 2) | 1);
|
|
out_uint8(s, 0x80);
|
|
s_mark_end(s);
|
|
if (xrdp_iso_send(self->iso_layer, s) != 0)
|
|
{
|
|
free_stream(s);
|
|
return 1;
|
|
}
|
|
free_stream(s);
|
|
return 0;
|
|
}
|