| 1 |
matty |
3 |
/* |
| 2 |
|
|
rdesktop: A Remote Desktop Protocol client. |
| 3 |
|
|
Protocol services - ISO layer |
| 4 |
|
|
Copyright (C) Matthew Chapman 1999-2000 |
| 5 |
|
|
|
| 6 |
|
|
This program is free software; you can redistribute it and/or modify |
| 7 |
|
|
it under the terms of the GNU General Public License as published by |
| 8 |
|
|
the Free Software Foundation; either version 2 of the License, or |
| 9 |
|
|
(at your option) any later version. |
| 10 |
|
|
|
| 11 |
|
|
This program is distributed in the hope that it will be useful, |
| 12 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
|
|
GNU General Public License for more details. |
| 15 |
|
|
|
| 16 |
|
|
You should have received a copy of the GNU General Public License |
| 17 |
|
|
along with this program; if not, write to the Free Software |
| 18 |
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 |
|
|
*/ |
| 20 |
|
|
|
| 21 |
|
|
#include "includes.h" |
| 22 |
|
|
|
| 23 |
|
|
/* Establish a connection up to the ISO layer */ |
| 24 |
|
|
HCONN iso_connect(char *server) |
| 25 |
|
|
{ |
| 26 |
|
|
HCONN conn; |
| 27 |
|
|
uint8 code; |
| 28 |
|
|
|
| 29 |
|
|
if ((conn = tcp_connect(server)) == NULL) |
| 30 |
|
|
return NULL; |
| 31 |
|
|
|
| 32 |
|
|
iso_send_msg(conn, ISO_PDU_CR); |
| 33 |
|
|
|
| 34 |
|
|
if (!iso_recv_msg(conn, &code) || (code != ISO_PDU_CC)) |
| 35 |
|
|
{ |
| 36 |
|
|
fprintf(stderr, "ISO error, expected CC\n"); |
| 37 |
|
|
tcp_disconnect(conn); |
| 38 |
|
|
return NULL; |
| 39 |
|
|
} |
| 40 |
|
|
|
| 41 |
|
|
return conn; |
| 42 |
|
|
} |
| 43 |
|
|
|
| 44 |
|
|
/* Disconnect from the ISO layer */ |
| 45 |
|
|
void iso_disconnect(HCONN conn) |
| 46 |
|
|
{ |
| 47 |
|
|
iso_send_msg(conn, ISO_PDU_DR); |
| 48 |
|
|
tcp_disconnect(conn); |
| 49 |
|
|
} |
| 50 |
|
|
|
| 51 |
|
|
/* Send self-contained ISO message identified by code */ |
| 52 |
|
|
BOOL iso_send_msg(HCONN conn, uint8 code) |
| 53 |
|
|
{ |
| 54 |
|
|
TPKT tpkt; |
| 55 |
|
|
TPDU tpdu; |
| 56 |
|
|
|
| 57 |
|
|
iso_make_tpkt(&tpkt, 11); |
| 58 |
|
|
iso_io_tpkt(&conn->out, &tpkt); |
| 59 |
|
|
iso_make_tpdu(&tpdu, code); |
| 60 |
|
|
iso_io_tpdu(&conn->out, &tpdu); |
| 61 |
|
|
MARK_END(conn->out); |
| 62 |
|
|
return tcp_send(conn); |
| 63 |
|
|
} |
| 64 |
|
|
|
| 65 |
|
|
/* Receive a message on the ISO layer, return code */ |
| 66 |
|
|
BOOL iso_recv_msg(HCONN conn, uint8 *code) |
| 67 |
|
|
{ |
| 68 |
|
|
TPDU tpdu; |
| 69 |
|
|
TPKT tpkt; |
| 70 |
|
|
BOOL res; |
| 71 |
|
|
|
| 72 |
|
|
res = tcp_recv(conn, 4); |
| 73 |
|
|
res = res ? iso_io_tpkt(&conn->in, &tpkt) : False; |
| 74 |
|
|
res = res ? tcp_recv(conn, tpkt.length - 4) : False; |
| 75 |
|
|
res = res ? iso_io_tpdu(&conn->in, &tpdu) : False; |
| 76 |
|
|
|
| 77 |
|
|
*code = tpdu.code; |
| 78 |
|
|
return res; |
| 79 |
|
|
} |
| 80 |
|
|
|
| 81 |
|
|
/* Initialise ISO transport data packet */ |
| 82 |
|
|
void iso_init(struct connection *conn) |
| 83 |
|
|
{ |
| 84 |
|
|
PUSH_LAYER(conn->out, iso_offset, 7); |
| 85 |
|
|
} |
| 86 |
|
|
|
| 87 |
|
|
/* Receive ISO transport data packet */ |
| 88 |
|
|
BOOL iso_recv(HCONN conn) |
| 89 |
|
|
{ |
| 90 |
|
|
uint8 code; |
| 91 |
|
|
|
| 92 |
|
|
if (!iso_recv_msg(conn, &code) || (code != ISO_PDU_DT)) |
| 93 |
|
|
{ |
| 94 |
|
|
fprintf(stderr, "ISO error, expected DT\n"); |
| 95 |
|
|
return False; |
| 96 |
|
|
} |
| 97 |
|
|
|
| 98 |
|
|
return True; |
| 99 |
|
|
} |
| 100 |
|
|
|
| 101 |
|
|
/* Receive ISO transport data packet */ |
| 102 |
|
|
BOOL iso_send(HCONN conn) |
| 103 |
|
|
{ |
| 104 |
|
|
TPKT tpkt; |
| 105 |
|
|
TPDU tpdu; |
| 106 |
|
|
|
| 107 |
|
|
POP_LAYER(conn->out, iso_offset); |
| 108 |
|
|
iso_make_tpkt(&tpkt, conn->out.end); |
| 109 |
|
|
iso_io_tpkt(&conn->out, &tpkt); |
| 110 |
|
|
iso_make_tpdu(&tpdu, ISO_PDU_DT); |
| 111 |
|
|
iso_io_tpdu(&conn->out, &tpdu); |
| 112 |
|
|
return tcp_send(conn); |
| 113 |
|
|
} |
| 114 |
|
|
|
| 115 |
|
|
/* Initialise a TPKT structure */ |
| 116 |
|
|
void iso_make_tpkt(TPKT *tpkt, int length) |
| 117 |
|
|
{ |
| 118 |
|
|
tpkt->version = 3; |
| 119 |
|
|
tpkt->reserved = 0; |
| 120 |
|
|
tpkt->length = length; |
| 121 |
|
|
} |
| 122 |
|
|
|
| 123 |
|
|
/* Marshall/demarshall a TPKT structure */ |
| 124 |
|
|
BOOL iso_io_tpkt(STREAM s, TPKT *tpkt) |
| 125 |
|
|
{ |
| 126 |
|
|
if (!prs_io_uint8(s, &tpkt->version)) |
| 127 |
|
|
return False; |
| 128 |
|
|
|
| 129 |
|
|
if (tpkt->version != 3) |
| 130 |
|
|
{ |
| 131 |
|
|
fprintf(stderr, "Wrong TPKT version %d\n", tpkt->version); |
| 132 |
|
|
return False; |
| 133 |
|
|
} |
| 134 |
|
|
|
| 135 |
|
|
if (!prs_io_uint8 (s, &tpkt->reserved)) |
| 136 |
|
|
return False; |
| 137 |
|
|
|
| 138 |
|
|
if (!msb_io_uint16(s, &tpkt->length)) |
| 139 |
|
|
return False; |
| 140 |
|
|
|
| 141 |
|
|
return True; |
| 142 |
|
|
} |
| 143 |
|
|
|
| 144 |
|
|
/* Initialise a TPDU structure */ |
| 145 |
|
|
void iso_make_tpdu(TPDU *tpdu, uint8 code) |
| 146 |
|
|
{ |
| 147 |
|
|
tpdu->hlen = (code == ISO_PDU_DT) ? 2 : 6; |
| 148 |
|
|
tpdu->code = code; |
| 149 |
|
|
tpdu->dst_ref = tpdu->src_ref = 0; |
| 150 |
|
|
tpdu->class = 0; |
| 151 |
|
|
tpdu->eot = 0x80; |
| 152 |
|
|
} |
| 153 |
|
|
|
| 154 |
|
|
/* Marshall/demarshall a TPDU structure */ |
| 155 |
|
|
BOOL iso_io_tpdu(STREAM s, TPDU *tpdu) |
| 156 |
|
|
{ |
| 157 |
|
|
BOOL res = True; |
| 158 |
|
|
|
| 159 |
|
|
res = res ? prs_io_uint8 (s, &tpdu->hlen) : False; |
| 160 |
|
|
res = res ? prs_io_uint8 (s, &tpdu->code) : False; |
| 161 |
|
|
|
| 162 |
|
|
if (tpdu->code == ISO_PDU_DT) |
| 163 |
|
|
{ |
| 164 |
|
|
res = res ? prs_io_uint8(s, &tpdu->eot) : False; |
| 165 |
|
|
} |
| 166 |
|
|
else |
| 167 |
|
|
{ |
| 168 |
|
|
res = res ? msb_io_uint16(s, &tpdu->dst_ref) : False; |
| 169 |
|
|
res = res ? msb_io_uint16(s, &tpdu->src_ref) : False; |
| 170 |
|
|
res = res ? prs_io_uint8 (s, &tpdu->class ) : False; |
| 171 |
|
|
} |
| 172 |
|
|
|
| 173 |
|
|
return res; |
| 174 |
|
|
} |
Parent Directory
| 
Revision Log