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/* -*- 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 1999-2002 |
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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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|
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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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|
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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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*/ |
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|
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#include "rdesktop.h" |
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|
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/* Send a self-contained ISO PDU */ |
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static void |
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iso_send_msg(uint8 code) |
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{ |
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STREAM s; |
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|
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s = tcp_init(11); |
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|
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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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|
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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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|
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s_mark_end(s); |
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tcp_send(s); |
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} |
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|
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static void |
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iso_send_connection_request(char *username) |
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{ |
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STREAM s; |
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int length = 30 + strlen(username); |
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|
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s = tcp_init(length); |
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|
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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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|
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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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|
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out_uint8p(s, "Cookie: mstshash=", strlen("Cookie: mstshash=")); |
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out_uint8p(s, username, strlen(username)); |
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|
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out_uint8(s, 0x0d); /* Unknown */ |
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out_uint8(s, 0x0a); /* Unknown */ |
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|
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s_mark_end(s); |
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tcp_send(s); |
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} |
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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(uint8 * code) |
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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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|
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next_packet: |
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s = tcp_recv(NULL, 4); |
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if (s == NULL) |
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return NULL; |
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|
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in_uint8(s, version); |
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switch (version & 3) |
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{ |
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case 0: |
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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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break; |
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|
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case 3: |
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in_uint8s(s, 1); /* pad */ |
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in_uint16_be(s, length); |
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break; |
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|
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default: |
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error("TPKT v%d\n", version); |
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return NULL; |
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} |
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|
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s = tcp_recv(s, length - 4); |
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if (s == NULL) |
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return NULL; |
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|
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if ((version & 3) == 0) |
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{ |
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rdp5_process(s, version & 0x80); |
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goto next_packet; |
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} |
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|
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in_uint8s(s, 1); /* hdrlen */ |
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in_uint8(s, *code); |
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|
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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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|
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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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|
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/* Initialise ISO transport data packet */ |
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STREAM |
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iso_init(int length) |
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{ |
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STREAM s; |
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|
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s = tcp_init(length + 7); |
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s_push_layer(s, iso_hdr, 7); |
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|
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return s; |
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} |
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|
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/* Send an ISO data PDU */ |
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void |
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iso_send(STREAM s) |
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{ |
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uint16 length; |
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|
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s_pop_layer(s, iso_hdr); |
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length = s->end - s->p; |
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|
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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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|
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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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|
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tcp_send(s); |
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} |
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|
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/* Receive ISO transport data packet */ |
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STREAM |
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iso_recv(void) |
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{ |
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STREAM s; |
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uint8 code; |
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|
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s = iso_recv_msg(&code); |
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if (s == NULL) |
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return NULL; |
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|
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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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|
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return s; |
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} |
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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(char *server, char *username) |
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{ |
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uint8 code; |
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|
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if (!tcp_connect(server)) |
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return False; |
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|
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iso_send_connection_request(username); |
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|
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if (iso_recv_msg(&code) == NULL) |
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return False; |
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|
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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(); |
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return False; |
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} |
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|
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return True; |
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} |
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|
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/* Disconnect from the ISO layer */ |
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void |
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iso_disconnect(void) |
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{ |
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iso_send_msg(ISO_PDU_DR); |
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tcp_disconnect(); |
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} |
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