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                         buf[0] = 5; // message type
 145                         buf[1] = mouse1_down | mouse2_down; // button mask
 146                         buf[2] = param1 >> 8;
 147                         buf[3] = param1 & 0xff;
 148                         buf[4] = param2 >> 8;
 149                         buf[5] = param2 & 0xff;
 150                         write(vnc_sock, buf, 6);
 151
 152                         break;
 153                 default:
 154                         printf("- Unknown type %x\n", message_type);
 155                         break;
 156                 }
 157                 printf("\n");
 158         }
 159
 160         // re-request the entire framebuffer
 161         buf[0] = 3; // message type
 162         buf[1] = 1; // incremental
 163         buf[2] = 0; // xpos
 164         buf[3] = 0;
 165         buf[4] = 0; // ypos
 166         buf[5] = 0;
 167         buf[6] = 640 >> 8; // width
 168         buf[7] = 640 & 0xff;
 169         buf[8] = 480 >> 8; // height
 170         buf[9] = 480 & 0xff;
 171
 172         write(vnc_sock, buf, 10);
 173 }
 174
 175 struct ServerInitialization {
 176         unsigned short width;
 177         unsigned short height;
 178         unsigned char pixelformat[16]; // FIXME
 179         unsigned int name_len;
 180 };
 181
 182 int vnc_init()
 183 {
 184         char buf[256];
 185         int vnc_sock = tcp_connect("127.0.0.1", 5901);
 186         struct ServerInitialization si;
 187
 188         // get handshake
 189         if (read(vnc_sock, buf, 12) != 12)
 190                 error("short read on handshake\n");
 191         write(vnc_sock, "RFB 003.003\n", 12);
 192
 193         // get auth
 194         if (read(vnc_sock, buf, 4) != 4)
 195                 error("short read on auth\n");
 196
 197         if (buf[3] != 1)
 198                 error("auth needed or connection failed\n");
 199
 200         // send shared flag
 201         buf[0] = 1;
 202         write(vnc_sock, buf, 1);
 203
 204         // read the server initialization
 205         if (read(vnc_sock, &si, sizeof(struct ServerInitialization)) != sizeof(struct ServerInitialization))
 206                 error("short read on SI");
 207
 208         printf("Server is %u x %u\n", ntohs(si.width), ntohs(si.height));
 209
 210         if (read(vnc_sock, buf, ntohl(si.name_len)) != ntohl(si.name_len))
 211                 error("short read on server name\n");
 212
 213 //      printf("Server name is '%*s' (%u bytes)\n", ntohl(si.name_len), buf, ntohl(si.name_len));
 214
 215         // we can only accept raw encoding
 216         buf[0] = 2; // message type
 217         buf[1] = 0; // padding
 218         buf[2] = 0; // number of encodings
 219         buf[3] = 1;
 220         buf[4] = 0; // raw encoding
 221         buf[5] = 0;
 222         buf[6] = 0;
 223         buf[7] = 0;
 224
 225         write(vnc_sock, buf, 8);
 226
 227         // request the entire framebuffer
 228         buf[0] = 3; // message type
 229         buf[1] = 0; // incremental
 230         buf[2] = 0; // xpos
 231         buf[3] = 0;
 232         buf[4] = 0; // ypos
 233         buf[5] = 0;
 234         buf[6] = 640 >> 8; // width
 235         buf[7] = 640 & 0xff;
 236         buf[8] = 480 >> 8; // height
 237         buf[9] = 480 & 0xff;
 238
 239         write(vnc_sock, buf, 10);
 240
 241         printf("Connected to VNC!\n");
 242
 243         return vnc_sock;
 244 }
 245
 246 struct vnc_rectangle {
 247         unsigned short x, y, width, height;
 248         unsigned int encoding;
 249 };
 250
 251 void handle_vnc_fbupdate(int vnc_sock)
 252 {
 253         struct vnc_rectangle rect;
 254         unsigned char *data, *ptr, *src, *dst;
 255         unsigned short num_rect;
 256         int ret, data_left, i, xt, yt;
 257         unsigned char smallblock[64 * 64 * 3];
 258
 259         if (read(vnc_sock, &num_rect, 2) != 2)
 260                 error("short read on num_rect\n");
 261
 262         for (i = 0; i < ntohs(num_rect); ++i) {
 263                 int width, height;
 264
 265                 if (read(vnc_sock, &rect, sizeof(struct vnc_rectangle)) != sizeof(struct vnc_rectangle))
 266                         error("short read on vnc_rectangle\n");
 267
 268                 if (ntohl(rect.encoding) != 0)
 269                         error("unsupported encoding\n");
 270
 271                 width = ntohs(rect.width);
 272                 height = ntohs(rect.height);
 273
 274                 printf("UPDATE: %ux%u at (%u,%u)\n", width, height,
 275                         ntohs(rect.x), ntohs(rect.y));
 276
 277                 ptr = data = xmalloc(width * height * 4);
 278                 data_left = width * height * 4;
 279
 280                 while (data_left > 0) {
 281                         ret = read(vnc_sock, ptr, data_left);
 282                         if (ret <= 0)
 283                                 error("error on data read\n");
 284
 285                         ptr += ret;
 286                         data_left -= ret;
 287                 }
 288
 289                 // push our 32-bit RGB data into small enough chunks
 290                 // (64x64) so we are sure we can send them without
 291                 // everything crashing and stuff :-)
 292                 for (yt = 0; yt < (height + 63) / 64; ++yt) {
 293                         for (xt = 0; xt < (width + 63) / 64; ++xt) {
 294                                 int x, y;
 295                                 int bw = width - xt * 64;
 296                                 int bh = height - yt * 64;
 297                                 if (bw > 64)
 298                                         bw = 64;
 299                                 if (bh > 64)
 300                                         bh = 64;
 301
 302                                 dst = smallblock;
 303                                 for (y = 0; y < bh; ++y) {
 304                                         src = data + ((yt * 64 + (bh - 1 - y)) * width + (xt * 64)) * 4;
 305                                         for (x = 0; x < bw; ++x) {
 306                                                 *dst++ = *src++;
 307                                                 *dst++ = *src++;
 308                                                 *dst++ = *src++;
 309                                                 ++src;
 310                                         }
 311                                 }
 312
 313                                 rdp_send_bitmap_update(ntohs(rect.x) + xt * 64, ntohs(rect.y) + yt * 64, bw, bh, smallblock);
 314                         }
 315                 }
 316
 317                 xfree(data);
 318         }
 319 }
 320
 321 int serve_client()
 322 {
 323         int vnc_sock = vnc_init();
 324         int listen_on_vnc = 0;
 325
 326         if (!mcs_recv_connect_initial())
 327                 error("MCS_CONNECT_INITIAL recv failed");
 328         mcs_send_connect_response();
 329
 330         for ( ;; ) {
 331                 uint8 type, data_pdu_type;
 332                 STREAM s;
 333
 334                 fd_set readfs;
 335                 FD_ZERO(&readfs);
 336                 FD_SET(tcp_get_socket(), &readfs);
 337                 FD_SET(vnc_sock, &readfs);
 338
 339                 select(FD_SETSIZE, &readfs, NULL, NULL, NULL);
 340
 341                 // activity on RDP socket?
 342                 if (FD_ISSET(tcp_get_socket(), &readfs)) {
 343                         if ((s = rdp_recv(&type)) != NULL) {
 344                                 if (type != RDP_PDU_DATA) {
 345                                         printf("Unknown RDP packet of type %u\n", type);
 346                                         continue;
 347                                 }
 348
 349                                 in_uint8s(s, 8);        /* shareid, pad, streamid, length */
 350                                 in_uint8(s, data_pdu_type);
 351                                 in_uint8s(s, 3);        /* compress_type, compress_len */
 352
 353                                 switch (data_pdu_type) {
 354                                 case RDP_DATA_PDU_INPUT:
 355                                         handle_input_pdu(s, vnc_sock);
 356                                         listen_on_vnc = 1;
 357                                         break;
 358                                 default:
 359                                         printf("Unknown data PDU type %u\n", data_pdu_type);
 360                                 };
 361                         }
 362                 }
 363
 364                 // activity on VNC socket?
 365                 if (FD_ISSET(vnc_sock, &readfs) && listen_on_vnc) {
 366                         unsigned char buf[256];
 367
 368                         printf("Activity on VNC socket!\n");
 369
 370                         if (read(vnc_sock, buf, 1) != 1)
 371                                 error("short read on vnc_sock\n");
 372
 373                         switch (buf[0]) {
 374                         case 0:
 375                                 // frame buffer update!
 376                                 printf("Framebuffer update\n");
 377                                 if (read(vnc_sock, buf, 1) != 1)
 378                                         error("short read on vnc_sock\n");
 379                                 handle_vnc_fbupdate(vnc_sock);
 380                                 break;
 381                         case 2: // bell
 382                                 printf("\a\n");
 383                                 break;
 384                         case 3:
 385                                 printf("New text in clipboard, ignoring\n");
 386                                 if (read(vnc_sock, buf, 3) != 3)
 387                                         error("short read on vnc_sock\n");
 388                                 if (read(vnc_sock, buf, 4) != 4)
 389                                         error("short read on vnc_sock\n");
 390                                 if (read(vnc_sock, (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3], 4) != 4)
 391                                         error("short read on vnc_sock\n");
 392
 393                         default:
 394                                 printf("Unknown VNC server message %x\n", buf[0]);
 395                                 exit(1);
 396                         }
 397                 }
 398         }
 399 }