rdp.cpp

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/*
   rdesktop: A Remote Desktop Protocol client.
   Protocol services - RDP 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"

extern uint16 mcs_userid;
extern char username[16];
extern BOOL bitmap_compression;
extern BOOL orders;
extern BOOL encryption;
extern BOOL desktop_save;

uint8 *next_packet;
uint32 rdp_shareid;

/* Initialise an RDP packet */
static STREAM
rdp_init(int maxlen)
{
        STREAM s;

        s = sec_init(encryption ? SEC_ENCRYPT : 0, maxlen + 6);
        s_push_layer(s, rdp_hdr, 6);

        return s;
}

/* Send an RDP packet */
static void
rdp_send(STREAM s, uint8 pdu_type)
{
        uint16 length;

        s_pop_layer(s, rdp_hdr);
        length = s->end - s->p;

        out_uint16_le(s, length);
        out_uint16_le(s, (pdu_type | 0x10));    /* Version 1 */
        out_uint16_le(s, (mcs_userid + 1001));

        sec_send(s, encryption ? SEC_ENCRYPT : 0);
}

/* Receive an RDP packet */
STREAM
rdp_recv(uint8 * type)
{
        static STREAM rdp_s;
        uint16 length, pdu_type;

        if ((rdp_s == NULL) || (next_packet >= rdp_s->end))
        {
                rdp_s = sec_recv();
                if (rdp_s == NULL)
                        return NULL;

                next_packet = rdp_s->p;
        }
        else
        {
                rdp_s->p = next_packet;
        }

        in_uint16_le(rdp_s, length);
        /* 32k packets are really 8, keepalive fix */
        if (length == 0x8000)
        {
                next_packet += 8;
                *type = 0;
                return rdp_s;
        }
        in_uint16_le(rdp_s, pdu_type);
        in_uint8s(rdp_s, 2);    /* userid */
        *type = pdu_type & 0xf;

#if WITH_DEBUG
        DEBUG(("RDP packet (type %x):\n", *type));
        hexdump(next_packet, length);
#endif /*  */

        next_packet += length;
        return rdp_s;
}

/* Initialise an RDP data packet */
static STREAM
rdp_init_data(int maxlen)
{
        STREAM s;

        s = sec_init(encryption ? SEC_ENCRYPT : 0, maxlen + 18);
        s_push_layer(s, rdp_hdr, 18);

        return s;
}

/* Send an RDP data packet */
static void
rdp_send_data(STREAM s, uint8 data_pdu_type)
{
        uint16 length;

        s_pop_layer(s, rdp_hdr);
        length = s->end - s->p;

        out_uint16_le(s, length);
        out_uint16_le(s, (RDP_PDU_DATA | 0x10));
        out_uint16_le(s, (mcs_userid + 1001));

        out_uint32_le(s, rdp_shareid);
        out_uint8(s, 0);        /* pad */
        out_uint8(s, 1);        /* streamid */
        out_uint16_le(s, (length - 14));
        out_uint8(s, data_pdu_type);
        out_uint8(s, 0);        /* compress_type */
        out_uint16(s, 0);       /* compress_len */

        sec_send(s, encryption ? SEC_ENCRYPT : 0);
}

/* Output a string in Unicode */
void
rdp_out_unistr(STREAM s, char *string, int len)
{
        int i = 0, j = 0;

        len += 2;

        while (i < len)
        {
                s->p[i++] = string[j++];
                s->p[i++] = 0;
        }

        s->p += len;
}

/* Parse a logon info packet */
static void
rdp_send_logon_info(uint32 flags, char *domain, char *user,
                    char *password, char *program, char *directory)
{
        int len_domain = 2 * strlen(domain);
        int len_user = 2 * strlen(user);
        int len_password = 2 * strlen(password);
        int len_program = 2 * strlen(program);
        int len_directory = 2 * strlen(directory);
        uint32 sec_flags = encryption ? (SEC_LOGON_INFO | SEC_ENCRYPT) : SEC_LOGON_INFO;
        STREAM s;

        s = sec_init(sec_flags, 18 + len_domain + len_user + len_password
                     + len_program + len_directory + 10);

        out_uint32(s, 0);
        out_uint32_le(s, flags);
        out_uint16_le(s, len_domain);
        out_uint16_le(s, len_user);
        out_uint16_le(s, len_password);
        out_uint16_le(s, len_program);
        out_uint16_le(s, len_directory);
        rdp_out_unistr(s, domain, len_domain);
        rdp_out_unistr(s, user, len_user);
        rdp_out_unistr(s, password, len_password);
        rdp_out_unistr(s, program, len_program);
        rdp_out_unistr(s, directory, len_directory);

        s_mark_end(s);
        sec_send(s, sec_flags);
}

/* Send a control PDU */
static void
rdp_send_control(uint16 action)
{
        STREAM s;

        s = rdp_init_data(8);

        out_uint16_le(s, action);
        out_uint16(s, 0);       /* userid */
        out_uint32(s, 0);       /* control id */

        s_mark_end(s);
        rdp_send_data(s, RDP_DATA_PDU_CONTROL);
}

/* Send a synchronisation PDU */
static void
rdp_send_synchronise(void)
{
        STREAM s;

        s = rdp_init_data(4);

        out_uint16_le(s, 1);    /* type */
        out_uint16_le(s, 1002);

        s_mark_end(s);
        rdp_send_data(s, RDP_DATA_PDU_SYNCHRONISE);
}

/* Send a single input event */
void
rdp_send_input(uint32 time, uint16 message_type, uint16 device_flags, uint16 param1, uint16 param2)
{
        STREAM s;

        s = rdp_init_data(16);

        out_uint16_le(s, 1);    /* number of events */
        out_uint16(s, 0);       /* pad */

        out_uint32_le(s, time);
        out_uint16_le(s, message_type);
        out_uint16_le(s, device_flags);
        out_uint16_le(s, param1);
        out_uint16_le(s, param2);

        s_mark_end(s);
        rdp_send_data(s, RDP_DATA_PDU_INPUT);
}

/* Send an (empty) font information PDU */
static void
rdp_send_fonts(uint16 seq)
{
        STREAM s;

        s = rdp_init_data(8);

        out_uint16(s, 0);       /* number of fonts */
        out_uint16_le(s, 0x3e); /* unknown */
        out_uint16_le(s, seq);  /* unknown */
        out_uint16_le(s, 0x32); /* entry size */

        s_mark_end(s);
        rdp_send_data(s, RDP_DATA_PDU_FONT2);
}

/* Output general capability set */
static void
rdp_out_general_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_GENERAL);
        out_uint16_le(s, RDP_CAPLEN_GENERAL);

        out_uint16_le(s, 1);    /* OS major type */
        out_uint16_le(s, 3);    /* OS minor type */
        out_uint16_le(s, 0x200);        /* Protocol version */
        out_uint16(s, 0);       /* Pad */
        out_uint16(s, 0);       /* Compression types */
        out_uint16(s, 0);       /* Pad */
        out_uint16(s, 0);       /* Update capability */
        out_uint16(s, 0);       /* Remote unshare capability */
        out_uint16(s, 0);       /* Compression level */
        out_uint16(s, 0);       /* Pad */
}

/* Output bitmap capability set */
static void
rdp_out_bitmap_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_BITMAP);
        out_uint16_le(s, RDP_CAPLEN_BITMAP);

        out_uint16_le(s, 8);    /* Preferred BPP */
        out_uint16_le(s, 1);    /* Receive 1 BPP */
        out_uint16_le(s, 1);    /* Receive 4 BPP */
        out_uint16_le(s, 1);    /* Receive 8 BPP */
        out_uint16_le(s, 800);  /* Desktop width */
        out_uint16_le(s, 600);  /* Desktop height */
        out_uint16(s, 0);       /* Pad */
        out_uint16(s, 0);       /* Allow resize */
        out_uint16_le(s, bitmap_compression ? 1 : 0);   /* Support compression */
        out_uint16(s, 0);       /* Unknown */
        out_uint16_le(s, 1);    /* Unknown */
        out_uint16(s, 0);       /* Pad */
}

/* Output order capability set */
static void
rdp_out_order_caps(STREAM s)
{
        uint8 order_caps[32];


        memset(order_caps, 0, 32);
        order_caps[0] = 1;      /* dest blt */
        order_caps[1] = 1;      /* pat blt */
        order_caps[2] = 1;      /* screen blt */
//      order_caps[3] = 1;      /* required for memblt? */
        order_caps[8] = 1;      /* line */
        order_caps[9] = 1;      /* line */
        order_caps[10] = 1;     /* rect */
        order_caps[11] = (desktop_save == False ? 0 : 1);       /* desksave */
        order_caps[13] = 1;     /* memblt */
        order_caps[14] = 1;     /* triblt */
        order_caps[22] = 1;     /* polyline */
        order_caps[27] = 1;     /* text2 */
        out_uint16_le(s, RDP_CAPSET_ORDER);
        out_uint16_le(s, RDP_CAPLEN_ORDER);

        out_uint8s(s, 20);      /* Terminal desc, pad */
        out_uint16_le(s, 1);    /* Cache X granularity */
        out_uint16_le(s, 20);   /* Cache Y granularity */
        out_uint16(s, 0);       /* Pad */
        out_uint16_le(s, 1);    /* Max order level */
        out_uint16_le(s, 0x147);        /* Number of fonts */
        out_uint16_le(s, 0x2a); /* Capability flags */
        out_uint8p(s, order_caps, 32);  /* Orders supported */
        out_uint16_le(s, 0x6a1);        /* Text capability flags */
        out_uint8s(s, 6);       /* Pad */
        out_uint32_le(s, desktop_save == False ? 0 : 0x38400);  /* Desktop cache size */
//      out_uint32_le(s, 0); // desktop cache set to 0
        out_uint32(s, 0);       /* Unknown */
        out_uint32_le(s, 0x4e4);        /* Unknown */
}

/* Output bitmap cache capability set */
static void
rdp_out_bmpcache_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_BMPCACHE);
        out_uint16_le(s, RDP_CAPLEN_BMPCACHE);

        out_uint8s(s, 24);      /* unused */
        out_uint16_le(s, 0x258);        /* entries */
        out_uint16_le(s, 0x100);        /* max cell size */
        out_uint16_le(s, 0x12c);        /* entries */
        out_uint16_le(s, 0x400);        /* max cell size */
        out_uint16_le(s, 0x106);        /* entries */
        out_uint16_le(s, 0x1000);       /* max cell size */
}

/* Output control capability set */
static void
rdp_out_control_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_CONTROL);
        out_uint16_le(s, RDP_CAPLEN_CONTROL);

        out_uint16(s, 0);       /* Control capabilities */
        out_uint16(s, 0);       /* Remote detach */
        out_uint16_le(s, 2);    /* Control interest */
        out_uint16_le(s, 2);    /* Detach interest */
}

/* Output activation capability set */
static void
rdp_out_activate_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_ACTIVATE);
        out_uint16_le(s, RDP_CAPLEN_ACTIVATE);

        out_uint16(s, 0);       /* Help key */
        out_uint16(s, 0);       /* Help index key */
        out_uint16(s, 0);       /* Extended help key */
        out_uint16(s, 0);       /* Window activate */
}

/* Output pointer capability set */
static void
rdp_out_pointer_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_POINTER);
        out_uint16_le(s, RDP_CAPLEN_POINTER);

        out_uint16(s, 0);       /* Colour pointer */
        out_uint16_le(s, 20);   /* Cache size */
}

/* Output share capability set */
static void
rdp_out_share_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_SHARE);
        out_uint16_le(s, RDP_CAPLEN_SHARE);

        out_uint16(s, 0);       /* userid */
        out_uint16(s, 0);       /* pad */
}

/* Output colour cache capability set */
static void
rdp_out_colcache_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_COLCACHE);
        out_uint16_le(s, RDP_CAPLEN_COLCACHE);

        out_uint16_le(s, 6);    /* cache size */
        out_uint16(s, 0);       /* pad */
}

static uint8 canned_caps[] = {
        0x01, 0x00, 0x00, 0x00, 0x09, 0x04, 0x00, 0x00, 0x04,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x0C, 0x00, 0x08, 0x00, 0x01,
        0x00, 0x00, 0x00, 0x0E, 0x00, 0x08, 0x00, 0x01, 0x00, 0x00, 0x00,
        0x10, 0x00, 0x34, 0x00, 0xFE,
        0x00, 0x04, 0x00, 0xFE, 0x00, 0x04, 0x00, 0xFE, 0x00, 0x08, 0x00,
        0xFE, 0x00, 0x08, 0x00, 0xFE,
        0x00, 0x10, 0x00, 0xFE, 0x00, 0x20, 0x00, 0xFE, 0x00, 0x40, 0x00,
        0xFE, 0x00, 0x80, 0x00, 0xFE,
        0x00, 0x00, 0x01, 0x40, 0x00, 0x00, 0x08, 0x00, 0x01, 0x00, 0x01,
        0x02, 0x00, 0x00, 0x00
};

/* Output unknown capability set */
static void
rdp_out_unknown_caps(STREAM s)
{
        out_uint16_le(s, RDP_CAPSET_UNKNOWN);
        out_uint16_le(s, 0x58);

        out_uint8p(s, canned_caps, RDP_CAPLEN_UNKNOWN - 4);
}

/* Send a confirm active PDU */
static void
rdp_send_confirm_active(void)
{
        STREAM s;
        uint16 caplen =
                RDP_CAPLEN_GENERAL + RDP_CAPLEN_BITMAP + RDP_CAPLEN_ORDER +
                RDP_CAPLEN_BMPCACHE + RDP_CAPLEN_COLCACHE +
                RDP_CAPLEN_ACTIVATE + RDP_CAPLEN_CONTROL +
                RDP_CAPLEN_POINTER + RDP_CAPLEN_SHARE + RDP_CAPLEN_UNKNOWN + 4 /* w2k fix, why? */ ;

        s = rdp_init(14 + caplen + sizeof(RDP_SOURCE));

        out_uint32_le(s, rdp_shareid);
        out_uint16_le(s, 0x3ea);        /* userid */
        out_uint16_le(s, sizeof(RDP_SOURCE));
        out_uint16_le(s, caplen);

        out_uint8p(s, RDP_SOURCE, sizeof(RDP_SOURCE));
        out_uint16_le(s, 0xd);  /* num_caps */
        out_uint8s(s, 2);       /* pad */

        rdp_out_general_caps(s);
        rdp_out_bitmap_caps(s);
        rdp_out_order_caps(s);
        rdp_out_bmpcache_caps(s);
        rdp_out_colcache_caps(s);
        rdp_out_activate_caps(s);
        rdp_out_control_caps(s);
        rdp_out_pointer_caps(s);
        rdp_out_share_caps(s);
        rdp_out_unknown_caps(s);

        s_mark_end(s);
        rdp_send(s, RDP_PDU_CONFIRM_ACTIVE);
}

/* Respond to a demand active PDU */
void
process_demand_active(STREAM s)
{
        uint8 type;

        in_uint32_le(s, rdp_shareid);

        DEBUG(("DEMAND_ACTIVE(id=0x%x)\n", rdp_shareid));

        rdp_send_confirm_active();
        rdp_send_synchronise();
        rdp_send_control(RDP_CTL_COOPERATE);
        rdp_send_control(RDP_CTL_REQUEST_CONTROL);
        rdp_recv(&type);        /* RDP_PDU_SYNCHRONIZE */
        rdp_recv(&type);        /* RDP_CTL_COOPERATE */
        rdp_recv(&type);        /* RDP_CTL_GRANT_CONTROL */
        rdp_send_input(0, RDP_INPUT_SYNCHRONIZE, 0, 0, 0);
        rdp_send_fonts(1);
        rdp_send_fonts(2);
        rdp_recv(&type);        /* RDP_PDU_UNKNOWN 0x28 */
        reset_order_state();
}

/* Process a pointer PDU */
static void
process_pointer_pdu(STREAM s)
{
        uint16 message_type;
        uint16 x, y, width, height, cache_idx, masklen, datalen;
        uint8 *mask, *data;
        HCURSOR cursor;

        in_uint16_le(s, message_type);
        in_uint8s(s, 2);        /* pad */

        switch (message_type)
        {
                case RDP_POINTER_MOVE:
                        in_uint16_le(s, x);
                        in_uint16_le(s, y);
                        if (s_check(s))
                                ui_move_pointer(x, y);
                        break;

                case RDP_POINTER_COLOR:
                        in_uint16_le(s, cache_idx);
                        in_uint16_le(s, x);
                        in_uint16_le(s, y);
                        in_uint16_le(s, width);
                        in_uint16_le(s, height);
                        in_uint16_le(s, masklen);
                        in_uint16_le(s, datalen);
                        in_uint8p(s, data, datalen);
                        in_uint8p(s, mask, masklen);
                        cursor = ui_create_cursor(x, y, width, height, mask, data);
                        ui_set_cursor(cursor);
                        cache_put_cursor(cache_idx, cursor);
                        break;

                case RDP_POINTER_CACHED:
                        in_uint16_le(s, cache_idx);
                        ui_set_cursor(cache_get_cursor(cache_idx));
                        break;

                default:
                        DEBUG(("Pointer message 0x%x\n", message_type));
        }
}

/* Process bitmap updates */
static void
process_bitmap_updates(STREAM s)
{
        uint16 num_updates;
        uint16 left, top, right, bottom, width, height;
        uint16 cx, cy, bpp, Bpp, compress, bufsize, size;
        uint8 *data, *bmpdata;
        int i;

   in_uint16_le(s, num_updates);

        for (i = 0; i < num_updates; i++)
        {
                in_uint16_le(s, left);
                in_uint16_le(s, top);
                in_uint16_le(s, right);
                in_uint16_le(s, bottom);
                in_uint16_le(s, width);
                in_uint16_le(s, height);
                in_uint16_le(s, bpp);
                Bpp = (bpp + 7) / 8;
                in_uint16_le(s, compress);
                in_uint16_le(s, bufsize);

                cx = right - left + 1;
                cy = bottom - top + 1;

                DEBUG(("UPDATE(l=%d,t=%d,r=%d,b=%d,w=%d,h=%d,cmp=%d)\n",
                       left, top, right, bottom, width, height, compress));

                if (!compress)
                {
                        int y;
                        bmpdata = (uint8*)xmalloc(width * height * Bpp);
                        for (y = 0; y < height; y++)
                        {
                                in_uint8a(s, &bmpdata[(height - y - 1) * (width * Bpp)],
                                          width * Bpp);
                        }
                        ui_paint_bitmap(left, top, cx, cy, width, height, bmpdata);
                        xfree(bmpdata);
                        continue;
                }

                in_uint8s(s, 2);        /* pad */
                in_uint16_le(s, size);
                in_uint8s(s, 4);        /* line_size, final_size */
                in_uint8p(s, data, size);
                bmpdata = (uint8*)xmalloc(width * height * Bpp);
                if (bitmap_decompress(bmpdata, width, height, data, size, Bpp))
                {
                        ui_paint_bitmap(left, top, cx, cy, width, height, bmpdata);
                }
                xfree(bmpdata);
        }
}

/* Process a palette update */
static void
process_palette(STREAM s)
{
        COLOURENTRY *entry;
        COLOURMAP map;
        HCOLOURMAP hmap;
        int i;
   uint8 data[1536];

        in_uint8s(s, 2);        /* pad */
        in_uint16_le(s, map.ncolours);
        in_uint8s(s, 2);        /* pad */

        map.colours = (COLOURENTRY*)data;

        for (i = 0; i < map.ncolours; i++)
        {
                entry = &map.colours[i];
                in_uint8(s, entry->red);
                in_uint8(s, entry->green);
                in_uint8(s, entry->blue);
        }
        hmap = ui_create_colourmap(&map);
        ui_set_colourmap(hmap);
}

/* Process an update PDU */
static void
process_update_pdu(STREAM s)
{
        uint16 update_type;

        in_uint16_le(s, update_type);
        ui_begin_update();
        switch (update_type)
        {
                case RDP_UPDATE_ORDERS:
                        process_orders(s);
                        break;

                case RDP_UPDATE_BITMAP:
                        process_bitmap_updates(s);
                        break;

                case RDP_UPDATE_PALETTE:
                        process_palette(s);
                        break;

                case RDP_UPDATE_SYNCHRONIZE:
                        break;

                default:
                        unimpl("update %d\n", update_type);
        }
        ui_end_update();
}

/* Process data PDU */
void
process_data_pdu(STREAM s)
{
        uint8 data_pdu_type;

        in_uint8s(s, 8);        /* shareid, pad, streamid, length */
        in_uint8(s, data_pdu_type);
        in_uint8s(s, 3);        /* compress_type, compress_len */

        switch (data_pdu_type)
        {
                case RDP_DATA_PDU_UPDATE:
                        process_update_pdu(s);
                        break;

                case RDP_DATA_PDU_POINTER:
                        process_pointer_pdu(s);
                        break;

                case RDP_DATA_PDU_BELL:
                        ui_bell();
                        break;

                case RDP_DATA_PDU_LOGON:
                        /* User logged on */
                        break;

                default:
                        unimpl("data PDU %d\n", data_pdu_type);
        }
}

/* Process incoming packets */
BOOL
rdp_main_loop(void)
{
        uint8 type;
        STREAM s;
        BOOL cont = True;
        while (cont)
        {
                s = rdp_recv(&type);
                if (s == NULL)
                        return False;
                switch (type)
                {
                        case RDP_PDU_DEMAND_ACTIVE:
                                process_demand_active(s);
                                break;
                        case RDP_PDU_DEACTIVATE:
                                break;
                        case RDP_PDU_DATA:
                                process_data_pdu(s);
                                break;
                        case 0:
                                break;
                        default:
                                unimpl("PDU %d\n", type);
                }
                cont = next_packet < s->end;
        }
        return True;
}

/* Establish a connection up to the RDP layer */
BOOL
rdp_connect(char *server, uint32 flags, char *domain, char *password,
            char *command, char *directory)
{
        if (!sec_connect(server))
                return False;

        rdp_send_logon_info(flags, domain, username, password, command, directory);
        return True;
}

/* Disconnect from the RDP layer */
void
rdp_disconnect(void)
{
        sec_disconnect();
}

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