Diffstat (limited to 'noncore/net/opierdesktop/iso.cpp') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | noncore/net/opierdesktop/iso.cpp | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/noncore/net/opierdesktop/iso.cpp b/noncore/net/opierdesktop/iso.cpp new file mode 100644 index 0000000..0fa1a17 --- a/dev/null +++ b/noncore/net/opierdesktop/iso.cpp @@ -0,0 +1,170 @@ +/* + rdesktop: A Remote Desktop Protocol client. + Protocol services - ISO layer + Copyright (C) Matthew Chapman 1999-2002 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "rdesktop.h" + +/* Send a self-contained ISO PDU */ +static void +iso_send_msg(uint8 code) +{ + STREAM s; + + s = tcp_init(11); + + out_uint8(s, 3); /* version */ + out_uint8(s, 0); /* reserved */ + out_uint16_be(s, 11); /* length */ + + out_uint8(s, 6); /* hdrlen */ + out_uint8(s, code); + out_uint16(s, 0); /* dst_ref */ + out_uint16(s, 0); /* src_ref */ + out_uint8(s, 0); /* class */ + + s_mark_end(s); + tcp_send(s); +} + +/* Receive a message on the ISO layer, return code */ +static STREAM +iso_recv_msg(uint8 * code) +{ + STREAM s; + uint16 length; + uint8 version; + + s = tcp_recv(4); + if (s == NULL) + { + return NULL; + } + + in_uint8(s, version); + if (version != 3) + { + error("TPKT v%d\n", version); + return NULL; + } + + in_uint8s(s, 1); /* pad */ + in_uint16_be(s, length); + + s = tcp_recv(length - 4); + if (s == NULL) + return NULL; + + in_uint8s(s, 1); /* hdrlen */ + in_uint8(s, *code); + + if (*code == ISO_PDU_DT) + { + in_uint8s(s, 1); /* eot */ + return s; + } + + in_uint8s(s, 5); /* dst_ref, src_ref, class */ + return s; +} + +/* Initialise ISO transport data packet */ +STREAM +iso_init(int length) +{ + STREAM s; + + s = tcp_init(length + 7); + s_push_layer(s, iso_hdr, 7); + + return s; +} + +/* Send an ISO data PDU */ +void +iso_send(STREAM s) +{ + uint16 length; + + s_pop_layer(s, iso_hdr); + length = s->end - s->p; + + out_uint8(s, 3); /* version */ + out_uint8(s, 0); /* reserved */ + out_uint16_be(s, length); + + out_uint8(s, 2); /* hdrlen */ + out_uint8(s, ISO_PDU_DT); /* code */ + out_uint8(s, 0x80); /* eot */ + + tcp_send(s); +} + +/* Receive ISO transport data packet */ +STREAM +iso_recv(void) +{ + STREAM s; + uint8 code; + + s = iso_recv_msg(&code); + if (s == NULL) + return NULL; + + if (code != ISO_PDU_DT) + { + error("expected DT, got 0x%x\n", code); + return NULL; + } + + return s; +} + +/* Establish a connection up to the ISO layer */ +BOOL +iso_connect(char *server) +{ + uint8 code; + + if (!tcp_connect(server)) + return False; + + iso_send_msg(ISO_PDU_CR); + + if (iso_recv_msg(&code) == NULL) + { + return False; + } + + if (code != ISO_PDU_CC) + { + error("expected CC, got 0x%x\n", code); + tcp_disconnect(); + return False; + } + + return True; +} + +/* Disconnect from the ISO layer */ +void +iso_disconnect(void) +{ + iso_send_msg(ISO_PDU_DR); + tcp_disconnect(); +} |