git.sesse.net Git - rdpsrv/blob - rdpsrv.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <errno.h>
   5 #include <sys/select.h>
   6 #include <sys/socket.h>
   7 #include <sys/ioctl.h>
   8 #include <arpa/inet.h>
   9
  10 #include "rdesktop.h"
  11 #include "scancodes.h"
  12
  13 const int tcp_port_rdp = 3389;
  14 int create_server_socket();
  15 int serve_client();
  16
  17 int main()
  18 {
  19         int server_sock = create_server_socket();
  20         for ( ;; ) {
  21                 iso_recv_connect(server_sock);
  22                 printf("Got connection.\n");
  23                 serve_client();
  24                 printf("Client closed.\n");
  25         }
  26 }
  27
  28 int create_server_socket()
  29 {
  30         int server_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  31         const unsigned int one = 1, zero = 0;
  32         struct sockaddr_in addr;
  33         int err;
  34
  35         setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
  36         ioctl(server_sock, FIONBIO, &zero);
  37
  38         addr.sin_family = AF_INET;
  39         addr.sin_addr.s_addr = INADDR_ANY;
  40         addr.sin_port = htons(tcp_port_rdp);
  41
  42         do {
  43                 err = bind(server_sock, (struct sockaddr *)&addr, sizeof(struct sockaddr));
  44
  45                 if (err == -1) {
  46                         perror("bind()");
  47
  48                         /* try to recover from recoverable errors... */
  49                         if (errno == ENOMEM || errno == EADDRINUSE) {
  50                                 puts("Waiting 1 sec before trying again...");
  51                                 sleep(1);
  52                         } else {
  53                                 puts("Giving up.");
  54                                 exit(1);
  55                         }
  56                 }
  57         } while (err == -1);
  58
  59         listen(server_sock, 20);
  60         return server_sock;
  61 }
  62
  63 int map_scancode_to_vnc_key(int scancode)
  64 {
  65         switch (scancode)
  66         {
  67         case SCANCODE_CHAR_1 ... SCANCODE_CHAR_9:
  68                 return scancode + '1' - SCANCODE_CHAR_1;
  69         case SCANCODE_CHAR_0:
  70                 return '0';
  71         case SCANCODE_CHAR_BACKSPACE:
  72                 return 0xff08;
  73         case SCANCODE_CHAR_TAB:
  74                 return 0xff09;
  75         case SCANCODE_CHAR_Q ... SCANCODE_CHAR_P:
  76                 return "QWERTYUIOP"[scancode - SCANCODE_CHAR_Q];
  77         case SCANCODE_CHAR_A ... SCANCODE_CHAR_L:
  78                 return "ASDFGHJKL"[scancode - SCANCODE_CHAR_A];
  79         case SCANCODE_CHAR_Z ... SCANCODE_CHAR_M:
  80                 return "ZXCVBNM"[scancode - SCANCODE_CHAR_Z];
  81         default:
  82                 printf("Unknown scancode %x, ignoring\n", scancode);
  83                 return -1;
  84         }
  85 }
  86
  87 void handle_input_pdu(STREAM s, int vnc_sock)
  88 {
  89         uint32 time;
  90         uint16 message_type, device_flags, param1, param2;
  91         uint16 num_events;
  92         int i;
  93         char buf[256];
  94         static int mouse1_down = 0, mouse2_down = 0;
  95         int vnc_key;
  96
  97         in_uint16_le(s, num_events);   // number of events
  98         in_uint8s(s, 2);        // pad
  99
 100         for (i = 0; i < num_events; ++i) {
 101                 rdp_recv_input(s, &time, &message_type, &device_flags, &param1, &param2);
 102                 printf("Input event at time %u\n", time);
 103
 104                 switch (message_type) {
 105                 case RDP_INPUT_SYNCHRONIZE:
 106                         printf("- Type: Synchronize (ignored)\n");
 107                         break;
 108                 case RDP_INPUT_CODEPOINT:
 109                         printf("- Type: Codepoint (ignored)\n");
 110                         break;
 111                 case RDP_INPUT_VIRTKEY:
 112                         printf("- Type: Virtual key (ignored)\n");
 113                         break;
 114                 case RDP_INPUT_SCANCODE:
 115                         printf("- Type: Scancode\n");
 116                         printf("- Device flags: %x\n", device_flags);
 117                         printf("- Key: %x\n", param1);
 118
 119                         vnc_key = map_scancode_to_vnc_key(param1);
 120
 121                         if (vnc_key != -1) {
 122                                 buf[0] = 4; // message type
 123                                 buf[1] = (device_flags & KBD_FLAG_DOWN) ? 1 : 0; // down flag
 124                                 buf[2] = 0; // padding
 125                                 buf[3] = 0;
 126                                 buf[4] = vnc_key >> 24;  // keysym
 127                                 buf[5] = (vnc_key >> 16) & 0xff;
 128                                 buf[6] = (vnc_key >> 8) & 0xff;
 129                                 buf[7] = vnc_key & 0xff;
 130                                 write(vnc_sock, buf, 8);
 131                         }
 132
 133                         break;
 134                 case RDP_INPUT_MOUSE:
 135                         printf("- Type: Mouse\n");
 136                         printf("- Device flags: %x\n", device_flags);
 137                         printf("- Position: (%u,%u)\n", param1, param2);
 138
 139                         if (device_flags & MOUSE_FLAG_BUTTON1)
 140                                  mouse1_down = (device_flags & MOUSE_FLAG_DOWN) ? 0x01 : 0;
 141                         if (device_flags & MOUSE_FLAG_BUTTON2)
 142                                  mouse2_down = (device_flags & MOUSE_FLAG_DOWN) ? 0x02 : 0;
 143
 144                         printf("button mask = %x\n", mouse1_down | mouse2_down);
 145
 146                         buf[0] = 5; // message type
 147                         buf[1] = mouse1_down | mouse2_down; // button mask
 148                         buf[2] = param1 >> 8;
 149                         buf[3] = param1 & 0xff;
 150                         buf[4] = param2 >> 8;
 151                         buf[5] = param2 & 0xff;
 152                         write(vnc_sock, buf, 6);
 153
 154                         break;
 155                 default:
 156                         printf("- Unknown type %x\n", message_type);
 157                         break;
 158                 }
 159                 printf("\n");
 160         }
 161
 162         // re-request the entire framebuffer
 163         buf[0] = 3; // message type
 164         buf[1] = 1; // incremental
 165         buf[2] = 0; // xpos
 166         buf[3] = 0;
 167         buf[4] = 0; // ypos
 168         buf[5] = 0;
 169         buf[6] = 640 >> 8; // width
 170         buf[7] = 640 & 0xff;
 171         buf[8] = 480 >> 8; // height
 172         buf[9] = 480 & 0xff;
 173
 174         write(vnc_sock, buf, 10);
 175 }
 176
 177 struct ServerInitialization {
 178         unsigned short width;
 179         unsigned short height;
 180         unsigned char pixelformat[16]; // FIXME
 181         unsigned int name_len;
 182 };
 183
 184 int vnc_init()
 185 {
 186         char buf[256];
 187         int vnc_sock = tcp_connect("127.0.0.1", 5901);
 188         struct ServerInitialization si;
 189
 190         // get handshake
 191         if (read(vnc_sock, buf, 12) != 12)
 192                 error("short read on handshake\n");
 193         write(vnc_sock, "RFB 003.003\n", 12);
 194
 195         // get auth
 196         if (read(vnc_sock, buf, 4) != 4)
 197                 error("short read on auth\n");
 198
 199         if (buf[3] != 1)
 200                 error("auth needed or connection failed\n");
 201
 202         // send shared flag
 203         buf[0] = 1;
 204         write(vnc_sock, buf, 1);
 205
 206         // read the server initialization
 207         if (read(vnc_sock, &si, sizeof(struct ServerInitialization)) != sizeof(struct ServerInitialization))
 208                 error("short read on SI");
 209
 210         printf("Server is %u x %u\n", ntohs(si.width), ntohs(si.height));
 211
 212         if (read(vnc_sock, buf, ntohl(si.name_len)) != ntohl(si.name_len))
 213                 error("short read on server name\n");
 214
 215 //      printf("Server name is '%*s' (%u bytes)\n", ntohl(si.name_len), buf, ntohl(si.name_len));
 216
 217         // we can only accept raw encoding
 218         buf[0] = 2; // message type
 219         buf[1] = 0; // padding
 220         buf[2] = 0; // number of encodings
 221         buf[3] = 1;
 222         buf[4] = 0; // raw encoding
 223         buf[5] = 0;
 224         buf[6] = 0;
 225         buf[7] = 0;
 226
 227         write(vnc_sock, buf, 8);
 228
 229         // request the entire framebuffer
 230         buf[0] = 3; // message type
 231         buf[1] = 0; // incremental
 232         buf[2] = 0; // xpos
 233         buf[3] = 0;
 234         buf[4] = 0; // ypos
 235         buf[5] = 0;
 236         buf[6] = 640 >> 8; // width
 237         buf[7] = 640 & 0xff;
 238         buf[8] = 480 >> 8; // height
 239         buf[9] = 480 & 0xff;
 240
 241         write(vnc_sock, buf, 10);
 242
 243         printf("Connected to VNC!\n");
 244
 245         return vnc_sock;
 246 }
 247
 248 struct vnc_rectangle {
 249         unsigned short x, y, width, height;
 250         unsigned int encoding;
 251 };
 252
 253 void handle_vnc_fbupdate(int vnc_sock)
 254 {
 255         struct vnc_rectangle rect;
 256         unsigned char *data, *ptr, *src, *dst;
 257         unsigned short num_rect;
 258         int ret, data_left, i, xt, yt;
 259         unsigned char smallblock[64 * 64 * 3];
 260
 261         if (read(vnc_sock, &num_rect, 2) != 2)
 262                 error("short read on num_rect\n");
 263
 264         for (i = 0; i < ntohs(num_rect); ++i) {
 265                 int width, height;
 266
 267                 if (read(vnc_sock, &rect, sizeof(struct vnc_rectangle)) != sizeof(struct vnc_rectangle))
 268                         error("short read on vnc_rectangle\n");
 269
 270                 if (ntohl(rect.encoding) != 0)
 271                         error("unsupported encoding\n");
 272
 273                 width = ntohs(rect.width);
 274                 height = ntohs(rect.height);
 275
 276                 printf("UPDATE: %ux%u at (%u,%u)\n", width, height,
 277                         ntohs(rect.x), ntohs(rect.y));
 278
 279                 ptr = data = xmalloc(width * height * 4);
 280                 data_left = width * height * 4;
 281
 282                 while (data_left > 0) {
 283                         ret = read(vnc_sock, ptr, data_left);
 284                         if (ret <= 0)
 285                                 error("error on data read\n");
 286
 287                         ptr += ret;
 288                         data_left -= ret;
 289                 }
 290
 291                 // push our 32-bit RGB data into small enough chunks
 292                 // (64x64) so we are sure we can send them without
 293                 // everything crashing and stuff :-)
 294                 for (yt = 0; yt < (height + 63) / 64; ++yt) {
 295                         for (xt = 0; xt < (width + 63) / 64; ++xt) {
 296                                 int x, y;
 297                                 int bw = width - xt * 64;
 298                                 int bh = height - yt * 64;
 299                                 if (bw > 64)
 300                                         bw = 64;
 301                                 if (bh > 64)
 302                                         bh = 64;
 303
 304                                 dst = smallblock;
 305                                 for (y = 0; y < bh; ++y) {
 306                                         src = data + ((yt * 64 + (bh - 1 - y)) * width + (xt * 64)) * 4;
 307                                         for (x = 0; x < bw; ++x) {
 308                                                 *dst++ = *src++;
 309                                                 *dst++ = *src++;
 310                                                 *dst++ = *src++;
 311                                                 ++src;
 312                                         }
 313                                 }
 314
 315                                 rdp_send_bitmap_update(ntohs(rect.x) + xt * 64, ntohs(rect.y) + yt * 64, bw, bh, smallblock);
 316                         }
 317                 }
 318
 319                 xfree(data);
 320         }
 321 }
 322
 323 int serve_client()
 324 {
 325         int vnc_sock = vnc_init();
 326         int listen_on_vnc = 0;
 327
 328         if (!mcs_recv_connect_initial())
 329                 error("MCS_CONNECT_INITIAL recv failed");
 330         mcs_send_connect_response();
 331
 332         for ( ;; ) {
 333                 uint8 type, data_pdu_type;
 334                 STREAM s;
 335
 336                 fd_set readfs;
 337                 FD_ZERO(&readfs);
 338                 FD_SET(tcp_get_socket(), &readfs);
 339                 FD_SET(vnc_sock, &readfs);
 340
 341                 select(FD_SETSIZE, &readfs, NULL, NULL, NULL);
 342
 343                 // activity on RDP socket?
 344                 if (FD_ISSET(tcp_get_socket(), &readfs)) {
 345                         if ((s = rdp_recv(&type)) != NULL) {
 346                                 if (type != RDP_PDU_DATA) {
 347                                         printf("Unknown RDP packet of type %u\n", type);
 348                                         continue;
 349                                 }
 350
 351                                 in_uint8s(s, 8);        /* shareid, pad, streamid, length */
 352                                 in_uint8(s, data_pdu_type);
 353                                 in_uint8s(s, 3);        /* compress_type, compress_len */
 354
 355                                 switch (data_pdu_type) {
 356                                 case RDP_DATA_PDU_INPUT:
 357                                         handle_input_pdu(s, vnc_sock);
 358                                         listen_on_vnc = 1;
 359                                         break;
 360                                 default:
 361                                         printf("Unknown data PDU type %u\n", data_pdu_type);
 362                                 };
 363                         }
 364                 }
 365
 366                 // activity on VNC socket?
 367                 if (FD_ISSET(vnc_sock, &readfs) && listen_on_vnc) {
 368                         unsigned char buf[256];
 369
 370                         printf("Activity on VNC socket!\n");
 371
 372                         if (read(vnc_sock, buf, 1) != 1)
 373                                 error("short read on vnc_sock\n");
 374
 375                         switch (buf[0]) {
 376                         case 0:
 377                                 // frame buffer update!
 378                                 printf("Framebuffer update\n");
 379                                 if (read(vnc_sock, buf, 1) != 1)
 380                                         error("short read on vnc_sock\n");
 381                                 handle_vnc_fbupdate(vnc_sock);
 382                                 break;
 383                         case 2: // bell
 384                                 printf("\a\n");
 385                                 break;
 386                         case 3:
 387                                 printf("New text in clipboard, ignoring\n");
 388                                 if (read(vnc_sock, buf, 3) != 3)
 389                                         error("short read on vnc_sock\n");
 390                                 if (read(vnc_sock, buf, 4) != 4)
 391                                         error("short read on vnc_sock\n");
 392                                 if (read(vnc_sock, (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3], 4) != 4)
 393                                         error("short read on vnc_sock\n");
 394
 395                         default:
 396                                 printf("Unknown VNC server message %x\n", buf[0]);
 397                                 exit(1);
 398                         }
 399                 }
 400         }
 401 }