adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2001, Adam Dunkels. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
adamdunkels | 9b85259 | 2004-06-06 05:54:47 +0000 | [diff] [blame] | 13 | * 3. The name of the author may not be used to endorse or promote |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 14 | * products derived from this software without specific prior |
| 15 | * written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
| 18 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| 19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| 23 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 25 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 26 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | * |
| 29 | * This file is part of the uIP TCP/IP stack. |
| 30 | * |
adamdunkels | 18c26e1 | 2004-08-09 20:32:28 +0000 | [diff] [blame] | 31 | * $Id: vnc-server.c,v 1.4 2004/08/09 20:32:28 adamdunkels Exp $ |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 32 | * |
| 33 | */ |
| 34 | |
| 35 | /* A micro implementation of a VNC server. VNC is a protocol for |
| 36 | remote network displays. See http://www.uk.research.att.com/vnc/ |
| 37 | for information about VNC. |
| 38 | |
| 39 | Initialization states: |
| 40 | |
| 41 | VNC_VERSION (send version string) |
| 42 | VNC_AUTH (send auth message) |
| 43 | VNC_INIT (send init message) |
| 44 | |
| 45 | Steady state: |
| 46 | |
| 47 | VNC_RUNNING (send RFB updates, parse incoming messages) |
| 48 | |
| 49 | What kind of message should be sent: |
| 50 | |
| 51 | SEND_NONE (No message) |
| 52 | SEND_BLANK (Blank screen initially) |
| 53 | SEND_SCREEN (Send entire screen, initially) |
| 54 | SEND_UPDATE (Send incremental update) |
| 55 | |
| 56 | */ |
| 57 | |
| 58 | #include "uip.h" |
| 59 | #include "vnc-server.h" |
| 60 | #include "vnc-out.h" |
| 61 | |
adamdunkels | 9b85259 | 2004-06-06 05:54:47 +0000 | [diff] [blame] | 62 | #include <string.h> |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 63 | |
| 64 | /* RFB server initial handshaking string. */ |
| 65 | #define RFB_SERVER_VERSION_STRING rfb_server_version_string |
| 66 | |
| 67 | /* "RFB 003.003" */ |
| 68 | static u8_t rfb_server_version_string[12] = {82,70,66,32,48,48,51,46,48,48,51,10}; |
| 69 | |
| 70 | /* uVNC */ |
| 71 | static u8_t uvnc_name[4] = {117,86,78,67}; |
| 72 | #if 1 |
| 73 | #define PRINTF(x) |
| 74 | #else |
| 75 | #define PRINTF(x) printf x |
| 76 | #endif |
| 77 | |
| 78 | /*-----------------------------------------------------------------------------------*/ |
| 79 | u8_t |
| 80 | vnc_server_draw_rect(u8_t *ptr, u16_t x, u16_t y, u16_t w, u16_t h, u8_t c) |
| 81 | { |
adamdunkels | 18c26e1 | 2004-08-09 20:32:28 +0000 | [diff] [blame] | 82 | register struct rfb_fb_update_rect_hdr *recthdr; |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 83 | struct rfb_rre_hdr *rrehdr; |
| 84 | |
| 85 | recthdr = (struct rfb_fb_update_rect_hdr *)ptr; |
| 86 | rrehdr = (struct rfb_rre_hdr *)(ptr + sizeof(struct rfb_fb_update_rect_hdr)); |
| 87 | |
| 88 | recthdr->rect.x = x; |
| 89 | recthdr->rect.y = y; |
| 90 | recthdr->rect.w = w; |
| 91 | recthdr->rect.h = h; |
| 92 | recthdr->encoding[0] = |
| 93 | recthdr->encoding[1] = |
| 94 | recthdr->encoding[2] = 0; |
| 95 | recthdr->encoding[3] = RFB_ENC_RRE; |
| 96 | |
| 97 | rrehdr->subrects[0] = |
| 98 | rrehdr->subrects[1] = 0; |
| 99 | rrehdr->bgpixel = c; |
| 100 | |
| 101 | return sizeof(struct rfb_fb_update_rect_hdr) + sizeof(struct rfb_rre_hdr); |
| 102 | } |
| 103 | /*-----------------------------------------------------------------------------------*/ |
| 104 | void |
| 105 | vnc_server_init(void) |
| 106 | { |
| 107 | vnc_out_init(); |
| 108 | } |
| 109 | /*-----------------------------------------------------------------------------------*/ |
| 110 | static void |
| 111 | vnc_send_blank(struct vnc_server_state *vs) |
| 112 | { |
| 113 | switch(vs->type) { |
| 114 | case 0: |
| 115 | vnc_out_send_blank(vs); |
| 116 | break; |
| 117 | /* case 1: |
| 118 | vnc_stats_send_blank(vs); |
| 119 | break; */ |
| 120 | } |
| 121 | } |
| 122 | /*-----------------------------------------------------------------------------------*/ |
| 123 | static void |
| 124 | vnc_send_screen(struct vnc_server_state *vs) |
| 125 | { |
| 126 | switch(vs->type) { |
| 127 | case 0: |
| 128 | vnc_out_send_screen(vs); |
| 129 | break; |
| 130 | /* case 1: |
| 131 | vnc_stats_send_screen(vs); |
| 132 | break;*/ |
| 133 | } |
| 134 | } |
| 135 | /*-----------------------------------------------------------------------------------*/ |
| 136 | static void |
| 137 | vnc_send_update(struct vnc_server_state *vs) |
| 138 | { |
| 139 | switch(vs->type) { |
| 140 | case 0: |
| 141 | vnc_out_send_update(vs); |
| 142 | break; |
| 143 | /* case 1: |
| 144 | vnc_stats_send_update(vs); |
| 145 | break;*/ |
| 146 | } |
| 147 | } |
| 148 | /*-----------------------------------------------------------------------------------*/ |
| 149 | void |
| 150 | vnc_server_send_data(struct vnc_server_state *vs) |
| 151 | { |
adamdunkels | 18c26e1 | 2004-08-09 20:32:28 +0000 | [diff] [blame] | 152 | register struct rfb_server_init *initmsg; |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 153 | |
| 154 | switch(vs->state) { |
| 155 | case VNC_VERSION: |
| 156 | uip_send(RFB_SERVER_VERSION_STRING, sizeof(RFB_SERVER_VERSION_STRING)); |
| 157 | break; |
| 158 | case VNC_AUTH: |
| 159 | uip_appdata[0] = 0; |
| 160 | uip_appdata[1] = 0; |
| 161 | uip_appdata[2] = 0; |
| 162 | uip_appdata[3] = RFB_AUTH_NONE; |
| 163 | uip_send(uip_appdata, 4); |
| 164 | break; |
| 165 | case VNC_INIT: |
| 166 | initmsg = (struct rfb_server_init *)uip_appdata; |
| 167 | initmsg->width = htons(vs->width); |
| 168 | initmsg->height = htons(vs->height); |
| 169 | /* BGR233 pixel format. */ |
| 170 | initmsg->format.bps = 8; |
| 171 | initmsg->format.depth = 8; |
| 172 | initmsg->format.endian = 1; |
| 173 | initmsg->format.truecolor = 1; |
| 174 | initmsg->format.red_max = htons(7); |
| 175 | initmsg->format.green_max = htons(7); |
| 176 | initmsg->format.blue_max = htons(3); |
| 177 | initmsg->format.red_shift = 0; |
| 178 | initmsg->format.green_shift = 3; |
| 179 | initmsg->format.blue_shift = 6; |
| 180 | initmsg->namelength[0] = 0; |
| 181 | initmsg->namelength[1] = 0; |
| 182 | initmsg->namelength[2] = 0; |
| 183 | initmsg->namelength[3] = 4; |
adamdunkels | 9b85259 | 2004-06-06 05:54:47 +0000 | [diff] [blame] | 184 | memcpy(&uip_appdata[sizeof(struct rfb_server_init)], uvnc_name, 4); |
adamdunkels | 8bb5cca | 2003-08-24 22:41:31 +0000 | [diff] [blame] | 185 | /* uip_appdata[sizeof(struct rfb_server_init)+0] = 'u'; |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 186 | uip_appdata[sizeof(struct rfb_server_init)+1] = 'V'; |
| 187 | uip_appdata[sizeof(struct rfb_server_init)+2] = 'N'; |
adamdunkels | 8bb5cca | 2003-08-24 22:41:31 +0000 | [diff] [blame] | 188 | uip_appdata[sizeof(struct rfb_server_init)+3] = 'C';*/ |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 189 | uip_send(uip_appdata, sizeof(struct rfb_server_init) + 4); |
| 190 | break; |
| 191 | case VNC_RUNNING: |
| 192 | switch(vs->sendmsg) { |
| 193 | case SEND_NONE: |
| 194 | PRINTF(("Sending none\n")); |
| 195 | break; |
| 196 | |
| 197 | case SEND_BLANK: |
| 198 | case SENT_BLANK: |
| 199 | PRINTF(("Sending blank\n")); |
| 200 | vnc_send_blank(vs); |
| 201 | break; |
| 202 | |
| 203 | case SEND_SCREEN: |
| 204 | PRINTF(("Sending screen\n")); |
| 205 | vnc_send_screen(vs); |
| 206 | break; |
| 207 | |
| 208 | case SEND_UPDATE: |
| 209 | PRINTF(("Sending update\n")); |
| 210 | vnc_send_update(vs); |
| 211 | break; |
| 212 | } |
| 213 | break; |
| 214 | |
| 215 | default: |
| 216 | break; |
| 217 | } |
| 218 | |
| 219 | } |
| 220 | /*-----------------------------------------------------------------------------------*/ |
| 221 | static void |
| 222 | vnc_key_event(struct vnc_server_state *vs) |
| 223 | { |
| 224 | switch(vs->type) { |
| 225 | case 0: |
| 226 | vnc_out_key_event(vs); |
| 227 | break; |
| 228 | /* case 1: |
| 229 | vnc_stats_key_event(vs); |
| 230 | break;*/ |
| 231 | } |
| 232 | } |
| 233 | /*-----------------------------------------------------------------------------------*/ |
| 234 | static void |
| 235 | vnc_pointer_event(struct vnc_server_state *vs) |
| 236 | { |
| 237 | switch(vs->type) { |
| 238 | case 0: |
| 239 | vnc_out_pointer_event(vs); |
| 240 | break; |
| 241 | /* case 1: |
| 242 | vnc_stats_pointer_event(vs); |
| 243 | break;*/ |
| 244 | } |
| 245 | } |
| 246 | /*-----------------------------------------------------------------------------------*/ |
| 247 | static u8_t |
adamdunkels | 18c26e1 | 2004-08-09 20:32:28 +0000 | [diff] [blame] | 248 | vnc_read_data(register struct vnc_server_state *vs) |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 249 | { |
| 250 | u8_t *appdata; |
| 251 | u16_t len; |
| 252 | struct rfb_fb_update_request *req; |
| 253 | /* u8_t niter;*/ |
| 254 | |
| 255 | len = uip_datalen(); |
| 256 | appdata = (u8_t *)uip_appdata; |
| 257 | |
| 258 | /* First, check if there is data left to discard since last read. */ |
| 259 | if(vs->readlen > 0) { |
| 260 | appdata += vs->readlen; |
| 261 | if(len > vs->readlen) { |
| 262 | len -= vs->readlen; |
| 263 | vs->readlen = 0; |
| 264 | } else { |
| 265 | vs->readlen -= len; |
| 266 | len = 0; |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | if(vs->readlen != 0) { |
| 271 | return 1; |
| 272 | } |
| 273 | |
| 274 | /* All data read and ignored, parse next message. */ |
| 275 | /* for(niter = 32; niter > 0 && len > 0; --niter) {*/ |
| 276 | while(len > 0) { |
| 277 | switch(vs->state) { |
| 278 | case VNC_VERSION: |
| 279 | case VNC_VERSION2: |
| 280 | PRINTF(("Read in version\n")); |
| 281 | /* Receive and ignore client version string (12 bytes). */ |
| 282 | vs->state = VNC_AUTH; |
| 283 | vs->readlen = 12; |
| 284 | break; |
| 285 | |
| 286 | case VNC_AUTH: |
| 287 | case VNC_AUTH2: |
| 288 | PRINTF(("Read in auth \n")); |
| 289 | /* Read and discard initialization from client (1 byte). */ |
| 290 | vs->readlen = 1; |
| 291 | vs->state = VNC_INIT; |
| 292 | break; |
| 293 | |
| 294 | case VNC_INIT: |
| 295 | case VNC_INIT2: |
| 296 | PRINTF(("Read in init \n")); |
| 297 | vs->readlen = 0; |
| 298 | vs->state = VNC_RUNNING; |
| 299 | |
| 300 | case VNC_RUNNING: |
| 301 | /* Handle all client events. */ |
| 302 | switch(*appdata) { |
| 303 | case RFB_SET_PIXEL_FORMAT: |
| 304 | PRINTF(("Set pixel format\n")); |
| 305 | vs->readlen = sizeof(struct rfb_set_pixel_format); |
| 306 | /* Check if client runs with BGR233 format. If not, abort the |
| 307 | connection. */ |
| 308 | /* XXX: not implemented yet. */ |
| 309 | break; |
| 310 | |
| 311 | case RFB_FIX_COLORMAP_ENTRIES: |
| 312 | PRINTF(("Fix colormap entries\n")); |
| 313 | return 0; |
| 314 | |
| 315 | case RFB_SET_ENCODINGS: |
| 316 | PRINTF(("Set encodings\n")); |
| 317 | vs->readlen = sizeof(struct rfb_set_encoding); |
| 318 | vs->readlen += htons(((struct rfb_set_encoding *)appdata)->encodings) * 4; |
| 319 | /* Make sure that client supports the encodings we use. */ |
| 320 | /* XXX: not implemented yet. */ |
| 321 | break; |
| 322 | |
| 323 | case RFB_FB_UPDATE_REQ: |
| 324 | PRINTF(("Update request\n")); |
| 325 | vs->update_requested = 1; |
| 326 | vs->readlen = sizeof(struct rfb_fb_update_request); |
| 327 | /* blank the screen initially */ |
| 328 | req = (struct rfb_fb_update_request *)appdata; |
| 329 | if(req->incremental == 0) { |
| 330 | /* vs->sendmsg = SEND_BLANK;*/ |
| 331 | vnc_out_update_area(vs, 0, 0, vs->w, vs->h); |
| 332 | } |
| 333 | break; |
| 334 | |
| 335 | case RFB_KEY_EVENT: |
| 336 | vs->readlen = sizeof(struct rfb_key_event); |
| 337 | vnc_key_event(vs); |
| 338 | break; |
| 339 | |
| 340 | case RFB_POINTER_EVENT: |
| 341 | vs->readlen = sizeof(struct rfb_pointer_event); |
| 342 | vnc_pointer_event(vs); |
| 343 | break; |
| 344 | |
| 345 | case RFB_CLIENT_CUT_TEXT: |
| 346 | PRINTF(("Client cut text\n")); |
| 347 | |
| 348 | if(((struct rfb_client_cut_text *)appdata)->len[0] != 0 || |
| 349 | ((struct rfb_client_cut_text *)appdata)->len[1] != 0) { |
| 350 | return 0; |
| 351 | |
| 352 | } |
| 353 | vs->readlen = sizeof(struct rfb_client_cut_text) + |
| 354 | (((struct rfb_client_cut_text *)appdata)->len[2] << 8) + |
| 355 | ((struct rfb_client_cut_text *)appdata)->len[3]; |
| 356 | /* return 0;*/ |
| 357 | break; |
| 358 | |
| 359 | default: |
| 360 | PRINTF(("Unknown message %d\n", *appdata)); |
| 361 | return 0; |
| 362 | } |
| 363 | break; |
| 364 | |
| 365 | default: |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | if(vs->readlen > 0) { |
| 370 | if(len > vs->readlen) { |
| 371 | len -= vs->readlen; |
| 372 | appdata += vs->readlen; |
| 373 | vs->readlen = 0; |
| 374 | } else { |
| 375 | vs->readlen -= len; |
| 376 | len = 0; |
| 377 | } |
| 378 | } else { |
| 379 | /* Lost data. */ |
| 380 | break; |
| 381 | } |
| 382 | |
| 383 | } |
| 384 | |
| 385 | /* if(vs->readlen > 0) { |
| 386 | printf("More data %d\n", vs->readlen); |
| 387 | }*/ |
| 388 | |
| 389 | /* uip_appdata = appdata;*/ |
| 390 | |
| 391 | return 1; |
| 392 | } |
| 393 | /*-----------------------------------------------------------------------------------*/ |
| 394 | static void |
adamdunkels | 18c26e1 | 2004-08-09 20:32:28 +0000 | [diff] [blame] | 395 | vnc_new(register struct vnc_server_state *vs) |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 396 | { |
| 397 | vs->counter = 0; |
| 398 | vs->readlen = 0; |
| 399 | vs->sendmsg = SEND_NONE; |
| 400 | vs->update_requested = 1; |
| 401 | switch(vs->type) { |
| 402 | case 0: |
| 403 | vnc_out_new(vs); |
| 404 | break; |
| 405 | /* case 1: |
| 406 | vnc_stats_new(vs); |
| 407 | break;*/ |
| 408 | } |
| 409 | } |
| 410 | /*-----------------------------------------------------------------------------------*/ |
| 411 | static void |
adamdunkels | 18c26e1 | 2004-08-09 20:32:28 +0000 | [diff] [blame] | 412 | vnc_acked(register struct vnc_server_state *vs) |
adamdunkels | 2d01531 | 2003-07-02 21:34:00 +0000 | [diff] [blame] | 413 | { |
| 414 | switch(vs->state) { |
| 415 | case VNC_VERSION: |
| 416 | vs->state = VNC_VERSION2; |
| 417 | break; |
| 418 | |
| 419 | case VNC_AUTH: |
| 420 | vs->state = VNC_AUTH2; |
| 421 | break; |
| 422 | |
| 423 | case VNC_INIT: |
| 424 | vs->state = VNC_INIT2; |
| 425 | break; |
| 426 | |
| 427 | case VNC_RUNNING: |
| 428 | switch(vs->type) { |
| 429 | case 0: |
| 430 | vnc_out_acked(vs); |
| 431 | break; |
| 432 | /* case 1: |
| 433 | vnc_stats_acked(vs); |
| 434 | break;*/ |
| 435 | } |
| 436 | break; |
| 437 | } |
| 438 | } |
| 439 | /*-----------------------------------------------------------------------------------*/ |
| 440 | void |
| 441 | vnc_server_appcall(struct vnc_server_state *vs) |
| 442 | { |
| 443 | |
| 444 | vs->type = htons(uip_conn->lport) - 5900; |
| 445 | |
| 446 | if(uip_connected()) { |
| 447 | vnc_new(vs); |
| 448 | vs->state = VNC_VERSION; |
| 449 | vnc_server_send_data(vs); |
| 450 | return; |
| 451 | } |
| 452 | if(uip_acked()) { |
| 453 | PRINTF(("Acked\n")); |
| 454 | vnc_acked(vs); |
| 455 | } |
| 456 | |
| 457 | if(uip_newdata()) { |
| 458 | PRINTF(("Newdata\n")); |
| 459 | vs->counter = 0; |
| 460 | if(vnc_read_data(vs) == 0) { |
| 461 | uip_abort(); |
| 462 | return; |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | if(uip_rexmit()) { |
| 467 | PRINTF(("Rexmit\n")); |
| 468 | } |
| 469 | |
| 470 | |
| 471 | if(uip_newdata() || |
| 472 | uip_rexmit() || |
| 473 | uip_acked()) { |
| 474 | vnc_server_send_data(vs); |
| 475 | } else if(uip_poll()) { |
| 476 | ++vs->counter; |
| 477 | /* Abort connection after about 20 seconds of inactivity. */ |
| 478 | if(vs->counter >= 40) { |
| 479 | uip_abort(); |
| 480 | return; |
| 481 | } |
| 482 | |
| 483 | vnc_out_poll(vs); |
| 484 | } |
| 485 | |
| 486 | } |
| 487 | /*-----------------------------------------------------------------------------------*/ |