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