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241 lines
4.7 KiB
C
241 lines
4.7 KiB
C
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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Protocol services - ISO layer
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Copyright (C) Matthew Chapman 1999-2005
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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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "rdesktop.h"
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/* Send a self-contained ISO PDU */
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static BOOL
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iso_send_msg(RDPCLIENT * This, uint8 code)
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{
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STREAM s;
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s = tcp_init(This, 11);
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if(s == NULL)
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return False;
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out_uint8(s, 3); /* version */
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out_uint8(s, 0); /* reserved */
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out_uint16_be(s, 11); /* length */
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out_uint8(s, 6); /* hdrlen */
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out_uint8(s, code);
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out_uint16(s, 0); /* dst_ref */
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out_uint16(s, 0); /* src_ref */
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out_uint8(s, 0); /* class */
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s_mark_end(s);
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return tcp_send(This, s);
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}
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static BOOL
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iso_send_connection_request(RDPCLIENT * This, char *cookie)
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{
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STREAM s;
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int cookielen = (int)strlen(cookie);
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int length = 11 + cookielen;
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s = tcp_init(This, length);
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if(s == NULL)
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return False;
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out_uint8(s, 3); /* version */
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out_uint8(s, 0); /* reserved */
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out_uint16_be(s, length); /* length */
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out_uint8(s, length - 5); /* hdrlen */
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out_uint8(s, ISO_PDU_CR);
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out_uint16(s, 0); /* dst_ref */
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out_uint16(s, 0); /* src_ref */
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out_uint8(s, 0); /* class */
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out_uint8p(s, cookie, cookielen);
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s_mark_end(s);
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return tcp_send(This, s);
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}
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/* Receive a message on the ISO layer, return code */
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static STREAM
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iso_recv_msg(RDPCLIENT * This, uint8 * code, uint8 * rdpver)
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{
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STREAM s;
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uint16 length;
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uint8 version;
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s = tcp_recv(This, NULL, 4);
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if (s == NULL)
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return NULL;
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in_uint8(s, version);
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if (rdpver != NULL)
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*rdpver = version;
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if (version == 3)
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{
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in_uint8s(s, 1); /* pad */
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in_uint16_be(s, length);
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}
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else
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{
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in_uint8(s, length);
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if (length & 0x80)
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{
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length &= ~0x80;
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next_be(s, length);
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}
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}
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s = tcp_recv(This, s, length - 4);
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if (s == NULL)
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return NULL;
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if (version != 3)
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return s;
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in_uint8s(s, 1); /* hdrlen */
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in_uint8(s, *code);
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if (*code == ISO_PDU_DT)
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{
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in_uint8s(s, 1); /* eot */
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return s;
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}
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in_uint8s(s, 5); /* dst_ref, src_ref, class */
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return s;
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}
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/* Initialise ISO transport data packet */
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STREAM
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iso_init(RDPCLIENT * This, int length)
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{
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STREAM s;
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s = tcp_init(This, length + 7);
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if(s == NULL)
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return NULL;
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s_push_layer(s, iso_hdr, 7);
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return s;
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}
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/* Send an ISO data PDU */
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BOOL
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iso_send(RDPCLIENT * This, STREAM s)
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{
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uint16 length;
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s_pop_layer(s, iso_hdr);
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length = (uint16)(s->end - s->p);
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out_uint8(s, 3); /* version */
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out_uint8(s, 0); /* reserved */
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out_uint16_be(s, length);
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out_uint8(s, 2); /* hdrlen */
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out_uint8(s, ISO_PDU_DT); /* code */
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out_uint8(s, 0x80); /* eot */
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return tcp_send(This, s);
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}
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/* Receive ISO transport data packet */
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STREAM
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iso_recv(RDPCLIENT * This, uint8 * rdpver)
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{
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STREAM s;
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uint8 code = 0;
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s = iso_recv_msg(This, &code, rdpver);
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if (s == NULL)
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return NULL;
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if (rdpver != NULL)
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if (*rdpver != 3)
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return s;
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if (code != ISO_PDU_DT)
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{
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error("expected DT, got 0x%x\n", code);
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return NULL;
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}
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return s;
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}
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/* Establish a connection up to the ISO layer */
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BOOL
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iso_connect(RDPCLIENT * This, char *server, char *cookie)
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{
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uint8 code = 0;
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if (!tcp_connect(This, server))
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return False;
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if (!iso_send_connection_request(This, cookie))
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return False;
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if (iso_recv_msg(This, &code, NULL) == NULL)
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return False;
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if (code != ISO_PDU_CC)
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{
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error("expected CC, got 0x%x\n", code);
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tcp_disconnect(This);
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return False;
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}
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return True;
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}
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/* Establish a reconnection up to the ISO layer */
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BOOL
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iso_reconnect(RDPCLIENT * This, char *server, char *cookie)
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{
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uint8 code = 0;
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if (!tcp_connect(This, server))
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return False;
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if (!iso_send_connection_request(This, cookie)) // BUGBUG should we really pass the cookie here?
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return False;
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if (iso_recv_msg(This, &code, NULL) == NULL)
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return False;
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if (code != ISO_PDU_CC)
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{
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error("expected CC, got 0x%x\n", code);
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tcp_disconnect(This);
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return False;
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}
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return True;
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}
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/* Disconnect from the ISO layer */
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BOOL
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iso_disconnect(RDPCLIENT * This)
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{
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iso_send_msg(This, ISO_PDU_DR);
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return tcp_disconnect(This);
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}
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/* reset the state to support reconnecting */
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void
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iso_reset_state(RDPCLIENT * This)
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{
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tcp_reset_state(This);
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}
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