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)
  63 {
  64         uint32 time;
  65         uint16 message_type, device_flags, param1, param2;
  66         uint16 num_events;
  67         int i;
  68
  69         in_uint16_le(s, num_events);   // number of events
  70         in_uint8s(s, 2);        // pad
  71
  72         for (i = 0; i < num_events; ++i) {
  73                 rdp_recv_input(s, &time, &message_type, &device_flags, &param1, &param2);
  74                 printf("Input event at time %u\n", time);
  75
  76                 switch (message_type) {
  77                 case RDP_INPUT_SYNCHRONIZE:
  78                         printf("- Type: Synchronize (ignored)\n");
  79                         break;
  80                 case RDP_INPUT_CODEPOINT:
  81                         printf("- Type: Codepoint (ignored)\n");
  82                         break;
  83                 case RDP_INPUT_VIRTKEY:
  84                         printf("- Type: Virtual key (ignored)\n");
  85                         break;
  86                 case RDP_INPUT_SCANCODE:
  87                         printf("- Type: Scancode (ignored)\n");
  88                         break;
  89                 case RDP_INPUT_MOUSE:
  90                         printf("- Type: Mouse\n");
  91                         printf("- Device flags: %x\n", device_flags);
  92                         printf("- Position: (%u,%u)\n", param1, param2);
  93
  94                         break;
  95                 default:
  96                         printf("- Unknown type %x\n", message_type);
  97                         break;
  98                 }
  99                 printf("\n");
 100         }
 101 }
 102
 103 struct ServerInitialization {
 104         unsigned short width;
 105         unsigned short height;
 106         unsigned char pixelformat[16]; // FIXME
 107         unsigned int name_len;
 108 };
 109
 110 int vnc_init()
 111 {
 112         char buf[256];
 113         int vnc_sock = tcp_connect("127.0.0.1", 5901);
 114         struct ServerInitialization si;
 115
 116         // get handshake
 117         if (read(vnc_sock, buf, 12) != 12)
 118                 error("short read on handshake\n");
 119         write(vnc_sock, "RFB 003.003\n", 12);
 120
 121         // get auth
 122         if (read(vnc_sock, buf, 4) != 4)
 123                 error("short read on auth\n");
 124
 125         if (buf[3] != 1)
 126                 error("auth needed or connection failed\n");
 127
 128         // send shared flag
 129         buf[0] = 1;
 130         write(vnc_sock, buf, 1);
 131
 132         // read the server initialization
 133         if (read(vnc_sock, &si, sizeof(struct ServerInitialization)) != sizeof(struct ServerInitialization))
 134                 error("short read on SI");
 135
 136         printf("Server is %u x %u\n", ntohs(si.width), ntohs(si.height));
 137
 138         if (read(vnc_sock, buf, ntohl(si.name_len)) != ntohl(si.name_len))
 139                 error("short read on server name\n");
 140
 141         printf("Server name is '%*s' (%u bytes)\n", ntohl(si.name_len), buf, ntohl(si.name_len));
 142
 143         // we can only accept raw encoding
 144         buf[0] = 2; // message type
 145         buf[1] = 0; // padding
 146         buf[2] = 0; // number of encodings
 147         buf[3] = 1;
 148         buf[4] = 0; // raw encoding
 149         buf[5] = 0;
 150         buf[6] = 0;
 151         buf[7] = 0;
 152
 153         write(vnc_sock, buf, 8);
 154
 155         // request the entire framebuffer
 156         buf[0] = 3; // message type
 157         buf[1] = 0; // incremental
 158         buf[2] = 0; // xpos
 159         buf[3] = 0;
 160         buf[4] = 0; // ypos
 161         buf[5] = 0;
 162         buf[6] = 640 >> 8; // width
 163         buf[7] = 640 & 0xff;
 164         buf[8] = 480 >> 8; // height
 165         buf[9] = 480 & 0xff;
 166
 167         write(vnc_sock, buf, 10);
 168
 169         printf("Connected to VNC!\n");
 170
 171         return vnc_sock;
 172 }
 173
 174 struct vnc_rectangle {
 175         unsigned short x, y, width, height;
 176         unsigned int encoding;
 177 };
 178
 179 void handle_vnc_fbupdate(int vnc_sock)
 180 {
 181         struct vnc_rectangle rect;
 182         unsigned char *data, *ptr, *src, *dst;
 183         unsigned short num_rect;
 184         int ret, data_left, i, xt, yt;
 185         unsigned char smallblock[64 * 64 * 3];
 186
 187         if (read(vnc_sock, &num_rect, 2) != 2)
 188                 error("short read on num_rect\n");
 189
 190         for (i = 0; i < ntohs(num_rect); ++i) {
 191                 int width, height;
 192
 193                 if (read(vnc_sock, &rect, sizeof(struct vnc_rectangle)) != sizeof(struct vnc_rectangle))
 194                         error("short read on vnc_rectangle\n");
 195
 196                 if (ntohl(rect.encoding) != 0)
 197                         error("unsupported encoding\n");
 198
 199                 width = ntohs(rect.width);
 200                 height = ntohs(rect.height);
 201
 202                 printf("UPDATE: %ux%u at (%u,%u)\n", width, height,
 203                         ntohs(rect.x), ntohs(rect.y));
 204
 205                 ptr = data = xmalloc(width * height * 4);
 206                 data_left = width * height * 4;
 207
 208                 while (data_left > 0) {
 209                         ret = read(vnc_sock, ptr, data_left);
 210                         if (ret <= 0)
 211                                 error("error on data read\n");
 212
 213                         ptr += ret;
 214                         data_left -= ret;
 215                 }
 216
 217                 // push our 32-bit RGB data into small enough chunks
 218                 // (64x64) so we are sure we can send them without
 219                 // everything crashing and stuff :-)
 220                 for (yt = 0; yt < (height + 63) / 64; ++yt) {
 221                         for (xt = 0; xt < (width + 63) / 64; ++xt) {
 222                                 int x, y;
 223                                 int bw = width - xt * 64;
 224                                 int bh = height - yt * 64;
 225                                 if (bw > 64)
 226                                         bw = 64;
 227                                 if (bh > 64)
 228                                         bh = 64;
 229
 230                                 dst = smallblock;
 231                                 for (y = 0; y < bh; ++y) {
 232                                         src = data + ((yt * 64 + (bh + 1 - y)) * width + (xt * 64)) * 4;
 233                                         for (x = 0; x < bw; ++x) {
 234                                                 *dst++ = *src++;
 235                                                 *dst++ = *src++;
 236                                                 *dst++ = *src++;
 237                                                 ++src;
 238                                         }
 239                                 }
 240
 241                                 rdp_send_bitmap_update(ntohs(rect.x) + xt * 64, ntohs(rect.y) + yt * 64, bw, bh, smallblock);
 242                         }
 243                 }
 244
 245                 xfree(data);
 246         }
 247 }
 248
 249 int serve_client()
 250 {
 251         int vnc_sock = vnc_init();
 252         int listen_on_vnc = 0;
 253
 254         if (!mcs_recv_connect_initial())
 255                 error("MCS_CONNECT_INITIAL recv failed");
 256         mcs_send_connect_response();
 257
 258         for ( ;; ) {
 259                 uint8 type, data_pdu_type;
 260                 STREAM s;
 261
 262                 fd_set readfs;
 263                 FD_ZERO(&readfs);
 264                 FD_SET(tcp_get_socket(), &readfs);
 265                 FD_SET(vnc_sock, &readfs);
 266
 267                 select(FD_SETSIZE, &readfs, NULL, NULL, NULL);
 268
 269                 // activity on RDP socket?
 270                 if (FD_ISSET(tcp_get_socket(), &readfs)) {
 271                         if ((s = rdp_recv(&type)) != NULL) {
 272                                 if (type != RDP_PDU_DATA) {
 273                                         printf("Unknown RDP packet of type %u\n", type);
 274                                         continue;
 275                                 }
 276
 277                                 in_uint8s(s, 8);        /* shareid, pad, streamid, length */
 278                                 in_uint8(s, data_pdu_type);
 279                                 in_uint8s(s, 3);        /* compress_type, compress_len */
 280
 281                                 switch (data_pdu_type) {
 282                                 case RDP_DATA_PDU_INPUT:
 283                                         printf("Input PDU\n");
 284                                         handle_input_pdu(s);
 285                                         listen_on_vnc = 1;
 286                                         break;
 287                                 default:
 288                                         printf("Unknown data PDU type %u\n", data_pdu_type);
 289                                 };
 290                         }
 291                 }
 292
 293                 // activity on VNC socket?
 294                 if (FD_ISSET(vnc_sock, &readfs) && listen_on_vnc) {
 295                         unsigned char buf[256];
 296
 297                         printf("Activity on VNC socket!\n");
 298
 299                         if (read(vnc_sock, buf, 2) != 2)
 300                                 error("short read on vnc_sock\n");
 301
 302                         switch (buf[0]) {
 303                         case 0:
 304                                 // frame buffer update!
 305                                 handle_vnc_fbupdate(vnc_sock);
 306                                 break;
 307                         default:
 308                                 printf("Unknown VNC server message %x\n", buf[0]);
 309                                 exit(1);
 310                         }
 311                 }
 312         }
 313 }