mirror of https://github.com/neutrinolabs/xrdp
added xrdp_mcs.c
This commit is contained in:
jsorg71
parent
b7060e8a4a
commit
12ed9b1002
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/*
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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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Copyright (C) Jay Sorg 2004
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mcs layer
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*/
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#include "xrdp.h"
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/*****************************************************************************/
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struct xrdp_mcs* xrdp_mcs_create(struct xrdp_sec* owner)
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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->owner = owner;
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self->in_s = owner->in_s;
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self->out_s = owner->out_s;
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self->userid = 1;
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self->chanid = 1001;
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self->client_mcs_data = &owner->client_mcs_data;
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self->server_mcs_data = &owner->server_mcs_data;
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self->iso_layer = xrdp_iso_create(self);
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return self;
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}
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/*****************************************************************************/
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void xrdp_mcs_delete(struct xrdp_mcs* self)
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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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int xrdp_mcs_recv(struct xrdp_mcs* self)
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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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if (xrdp_iso_recv(self->iso_layer) != 0)
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return 1;
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in_uint8(self->in_s, opcode);
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appid = opcode >> 2;
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if (appid != MCS_SDRQ)
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return 1;
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in_uint8s(self->in_s, 5);
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in_uint8(self->in_s, len);
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if (len & 0x80)
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in_uint8s(self->in_s, 1);
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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 xrdp_mcs_ber_parse_header(struct xrdp_mcs* self, 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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if (tag_val > 0xff)
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{
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in_uint16_be(self->in_s, tag);
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}
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else
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{
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in_uint8(self->in_s, tag);
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}
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if (tag != tag_val)
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return 1;
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in_uint8(self->in_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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next_be(self->in_s, *len);
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l--;
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}
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}
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else
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*len = l;
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if (s_check(self->in_s))
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return 0;
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else
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return 1;
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}
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/*****************************************************************************/
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/* returns error */
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int xrdp_mcs_parse_domain_params(struct xrdp_mcs* self)
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{
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int len;
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if (xrdp_mcs_ber_parse_header(self, MCS_TAG_DOMAIN_PARAMS, &len) != 0)
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return 1;
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in_uint8s(self->in_s, len);
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if (s_check(self->in_s))
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return 0;
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else
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return 1;
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}
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/*****************************************************************************/
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/* returns error */
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int xrdp_mcs_recv_connect_initial(struct xrdp_mcs* self)
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{
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int len;
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if (xrdp_iso_recv(self->iso_layer) != 0)
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return 1;
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if (xrdp_mcs_ber_parse_header(self, MCS_CONNECT_INITIAL, &len) != 0)
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return 1;
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if (xrdp_mcs_ber_parse_header(self, BER_TAG_OCTET_STRING, &len) != 0)
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return 1;
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in_uint8s(self->in_s, len);
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if (xrdp_mcs_ber_parse_header(self, BER_TAG_OCTET_STRING, &len) != 0)
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return 1;
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in_uint8s(self->in_s, len);
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if (xrdp_mcs_ber_parse_header(self, BER_TAG_BOOLEAN, &len) != 0)
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return 1;
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in_uint8s(self->in_s, len);
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if (xrdp_mcs_parse_domain_params(self) != 0)
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return 1;
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if (xrdp_mcs_parse_domain_params(self) != 0)
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return 1;
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if (xrdp_mcs_parse_domain_params(self) != 0)
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return 1;
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if (xrdp_mcs_ber_parse_header(self, BER_TAG_OCTET_STRING, &len) != 0)
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return 1;
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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, self->in_s->p, len);
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in_uint8s(self->in_s, len);
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s_mark_end(self->client_mcs_data);
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if (s_check_end(self->in_s))
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return 0;
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else
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return 1;
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}
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/*****************************************************************************/
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/* returns error */
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int xrdp_mcs_recv_edrq(struct xrdp_mcs* self)
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{
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int opcode;
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if (xrdp_iso_recv(self->iso_layer) != 0)
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return 1;
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in_uint8(self->in_s, opcode);
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if ((opcode >> 2) != MCS_EDRQ)
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return 1;
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in_uint8s(self->in_s, 2);
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in_uint8s(self->in_s, 2);
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if (opcode & 2)
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{
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in_uint16_be(self->in_s, self->userid);
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}
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if (!(s_check_end(self->in_s)))
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return 1;
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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 xrdp_mcs_recv_aurq(struct xrdp_mcs* self)
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{
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int opcode;
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if (xrdp_iso_recv(self->iso_layer) != 0)
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return 1;
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in_uint8(self->in_s, opcode);
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if ((opcode >> 2) != MCS_AURQ)
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return 1;
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if (opcode & 2)
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{
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in_uint16_be(self->in_s, self->userid);
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}
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if (!(s_check_end(self->in_s)))
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return 1;
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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 xrdp_mcs_send_aucf(struct xrdp_mcs* self)
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{
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if (xrdp_iso_init(self->iso_layer, 4) != 0)
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return 1;
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out_uint8(self->out_s, (MCS_AUCF << 2) | 2);
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out_uint8s(self->out_s, 1);
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out_uint16_be(self->out_s, self->userid);
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s_mark_end(self->out_s);
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if (xrdp_iso_send(self->iso_layer) != 0)
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return 1;
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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 xrdp_mcs_recv_cjrq(struct xrdp_mcs* self)
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{
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int opcode;
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if (xrdp_iso_recv(self->iso_layer) != 0)
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return 1;
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in_uint8(self->in_s, opcode);
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if ((opcode >> 2) != MCS_CJRQ)
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return 1;
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in_uint8s(self->in_s, 4);
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if (opcode & 2)
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{
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in_uint8s(self->in_s, 2);
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}
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if (!(s_check_end(self->in_s)))
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return 1;
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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 xrdp_mcs_send_cjcf(struct xrdp_mcs* self, int chanid)
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{
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if (xrdp_iso_init(self->iso_layer, 8) != 0)
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return 1;
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out_uint8(self->out_s, (MCS_CJCF << 2) | 2);
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out_uint8(self->out_s, 0);
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out_uint16_be(self->out_s, self->userid);
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out_uint16_be(self->out_s, chanid);
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out_uint16_be(self->out_s, chanid);
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s_mark_end(self->out_s);
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if (xrdp_iso_send(self->iso_layer) != 0)
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return 1;
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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 xrdp_mcs_ber_out_header(struct xrdp_mcs* self, 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(self->out_s, tag_val);
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}
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else
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{
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out_uint8(self->out_s, tag_val);
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}
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if (len >= 0x80)
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{
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out_uint8(self->out_s, 0x82);
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out_uint16_be(self->out_s, len);
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}
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else
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{
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out_uint8(self->out_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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int xrdp_mcs_ber_out_int8(struct xrdp_mcs* self, int value)
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{
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xrdp_mcs_ber_out_header(self, BER_TAG_INTEGER, 1);
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out_uint8(self->out_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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int xrdp_mcs_ber_out_int16(struct xrdp_mcs* self, int value)
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{
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xrdp_mcs_ber_out_header(self, BER_TAG_INTEGER, 2);
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out_uint8(self->out_s, value >> 8);
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out_uint8(self->out_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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int xrdp_mcs_ber_out_int24(struct xrdp_mcs* self, int value)
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{
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xrdp_mcs_ber_out_header(self, BER_TAG_INTEGER, 3);
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out_uint8(self->out_s, value >> 16);
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out_uint8(self->out_s, value >> 8);
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out_uint8(self->out_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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int xrdp_mcs_out_domain_params(struct xrdp_mcs* self, 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, MCS_TAG_DOMAIN_PARAMS, 26);
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xrdp_mcs_ber_out_int8(self, max_channels);
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xrdp_mcs_ber_out_int8(self, max_users);
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xrdp_mcs_ber_out_int8(self, max_tokens);
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xrdp_mcs_ber_out_int8(self, 1);
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xrdp_mcs_ber_out_int8(self, 0);
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xrdp_mcs_ber_out_int8(self, 1);
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xrdp_mcs_ber_out_int24(self, max_pdu_size);
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xrdp_mcs_ber_out_int8(self, 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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int xrdp_mcs_send_connect_response(struct xrdp_mcs* self)
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{
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int data_len;
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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, 512);
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xrdp_mcs_ber_out_header(self, MCS_CONNECT_RESPONSE, 313);
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xrdp_mcs_ber_out_header(self, BER_TAG_RESULT, 1);
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out_uint8(self->out_s, 0);
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xrdp_mcs_ber_out_header(self, BER_TAG_INTEGER, 1);
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out_uint8(self->out_s, 0);
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xrdp_mcs_out_domain_params(self, 2, 2, 0, 0xffff);
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xrdp_mcs_ber_out_header(self, BER_TAG_OCTET_STRING, data_len);
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/* mcs data */
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out_uint8a(self->out_s, self->server_mcs_data->data, data_len);
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s_mark_end(self->out_s);
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if (xrdp_iso_send(self->iso_layer) != 0)
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return 1;
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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 xrdp_mcs_incoming(struct xrdp_mcs* self)
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{
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if (xrdp_iso_incoming(self->iso_layer) != 0)
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return 1;
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if (xrdp_mcs_recv_connect_initial(self) != 0)
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return 1;
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if (xrdp_mcs_send_connect_response(self) != 0)
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return 1;
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if (xrdp_mcs_recv_edrq(self) != 0)
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return 1;
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if (xrdp_mcs_recv_aurq(self) != 0)
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return 1;
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if (xrdp_mcs_send_aucf(self) != 0)
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return 1;
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if (xrdp_mcs_recv_cjrq(self) != 0)
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return 1;
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if (xrdp_mcs_send_cjcf(self, self->userid + MCS_USERCHANNEL_BASE) != 0)
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return 1;
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if (xrdp_mcs_recv_cjrq(self) != 0)
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return 1;
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if (xrdp_mcs_send_cjcf(self, MCS_GLOBAL_CHANNEL) != 0)
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return 1;
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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 xrdp_mcs_init(struct xrdp_mcs* self, int len)
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{
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xrdp_iso_init(self->iso_layer, len + 8);
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s_push_layer(self->out_s, mcs_hdr, 8);
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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 xrdp_mcs_send(struct xrdp_mcs* self)
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{
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int len;
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s_pop_layer(self->out_s, mcs_hdr);
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len = (self->out_s->end - self->out_s->p) - 8;
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len = len | 0x8000;
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out_uint8(self->out_s, MCS_SDIN << 2);
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out_uint16_be(self->out_s, self->userid);
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out_uint16_be(self->out_s, MCS_GLOBAL_CHANNEL);
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out_uint8(self->out_s, 0x70);
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out_uint16_be(self->out_s, len);
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if (xrdp_iso_send(self->iso_layer) != 0)
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return 1;
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return 0;
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}
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