usr.sbin/bhyve/rfb.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2015 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
   5  * Copyright (c) 2015 Leon Dang
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #ifndef WITHOUT_CAPSICUM
  35 #include <sys/capsicum.h>
  36 #endif
  37 #include <sys/endian.h>
  38 #include <sys/socket.h>
  39 #include <sys/select.h>
  40 #include <sys/time.h>
  41 #include <arpa/inet.h>
  42 #include <machine/cpufunc.h>
  43 #include <machine/specialreg.h>
  44 #include <netinet/in.h>
  45 #include <netdb.h>
  46
  47 #include <assert.h>
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <pthread.h>
  51 #include <pthread_np.h>
  52 #include <signal.h>
  53 #include <stdbool.h>
  54 #include <stdlib.h>
  55 #include <stdio.h>
  56 #include <string.h>
  57 #include <sysexits.h>
  58 #include <unistd.h>
  59
  60 #include <zlib.h>
  61
  62 #include "bhyvegc.h"
  63 #include "console.h"
  64 #include "rfb.h"
  65 #include "sockstream.h"
  66
  67 #ifndef NO_OPENSSL
  68 #include <openssl/des.h>
  69 #endif
  70
  71 static int rfb_debug = 0;
  72 #define DPRINTF(params) if (rfb_debug) printf params
  73 #define WPRINTF(params) printf params
  74
  75 #define AUTH_LENGTH     16
  76 #define PASSWD_LENGTH   8
  77
  78 #define SECURITY_TYPE_NONE      1
  79 #define SECURITY_TYPE_VNC_AUTH  2
  80
  81 #define AUTH_FAILED_UNAUTH      1
  82 #define AUTH_FAILED_ERROR       2
  83
  84 struct rfb_softc {
  85         int             sfd;
  86         pthread_t       tid;
  87
  88         int             cfd;
  89
  90         int             width, height;
  91
  92         char            *password;
  93
  94         bool    enc_raw_ok;
  95         bool    enc_zlib_ok;
  96         bool    enc_resize_ok;
  97
  98         z_stream        zstream;
  99         uint8_t         *zbuf;
 100         int             zbuflen;
 101
 102         int             conn_wait;
 103         int             sending;
 104         pthread_mutex_t mtx;
 105         pthread_cond_t  cond;
 106
 107         int             hw_crc;
 108         uint32_t        *crc;           /* WxH crc cells */
 109         uint32_t        *crc_tmp;       /* buffer to store single crc row */
 110         int             crc_width, crc_height;
 111 };
 112
 113 struct rfb_pixfmt {
 114         uint8_t         bpp;
 115         uint8_t         depth;
 116         uint8_t         bigendian;
 117         uint8_t         truecolor;
 118         uint16_t        red_max;
 119         uint16_t        green_max;
 120         uint16_t        blue_max;
 121         uint8_t         red_shift;
 122         uint8_t         green_shift;
 123         uint8_t         blue_shift;
 124         uint8_t         pad[3];
 125 };
 126
 127 struct rfb_srvr_info {
 128         uint16_t                width;
 129         uint16_t                height;
 130         struct rfb_pixfmt       pixfmt;
 131         uint32_t                namelen;
 132 };
 133
 134 struct rfb_pixfmt_msg {
 135         uint8_t                 type;
 136         uint8_t                 pad[3];
 137         struct rfb_pixfmt       pixfmt;
 138 };
 139
 140 #define RFB_ENCODING_RAW                0
 141 #define RFB_ENCODING_ZLIB               6
 142 #define RFB_ENCODING_RESIZE             -223
 143
 144 #define RFB_MAX_WIDTH                   2000
 145 #define RFB_MAX_HEIGHT                  1200
 146 #define RFB_ZLIB_BUFSZ                  RFB_MAX_WIDTH*RFB_MAX_HEIGHT*4
 147
 148 /* percentage changes to screen before sending the entire screen */
 149 #define RFB_SEND_ALL_THRESH             25
 150
 151 struct rfb_enc_msg {
 152         uint8_t         type;
 153         uint8_t         pad;
 154         uint16_t        numencs;
 155 };
 156
 157 struct rfb_updt_msg {
 158         uint8_t         type;
 159         uint8_t         incremental;
 160         uint16_t        x;
 161         uint16_t        y;
 162         uint16_t        width;
 163         uint16_t        height;
 164 };
 165
 166 struct rfb_key_msg {
 167         uint8_t         type;
 168         uint8_t         down;
 169         uint16_t        pad;
 170         uint32_t        code;
 171 };
 172
 173 struct rfb_ptr_msg {
 174         uint8_t         type;
 175         uint8_t         button;
 176         uint16_t        x;
 177         uint16_t        y;
 178 };
 179
 180 struct rfb_srvr_updt_msg {
 181         uint8_t         type;
 182         uint8_t         pad;
 183         uint16_t        numrects;
 184 };
 185
 186 struct rfb_srvr_rect_hdr {
 187         uint16_t        x;
 188         uint16_t        y;
 189         uint16_t        width;
 190         uint16_t        height;
 191         uint32_t        encoding;
 192 };
 193
 194 struct rfb_cuttext_msg {
 195         uint8_t         type;
 196         uint8_t         padding[3];
 197         uint32_t        length;
 198 };
 199
 200
 201 static void
 202 rfb_send_server_init_msg(int cfd)
 203 {
 204         struct bhyvegc_image *gc_image;
 205         struct rfb_srvr_info sinfo;
 206
 207         gc_image = console_get_image();
 208
 209         sinfo.width = htons(gc_image->width);
 210         sinfo.height = htons(gc_image->height);
 211         sinfo.pixfmt.bpp = 32;
 212         sinfo.pixfmt.depth = 32;
 213         sinfo.pixfmt.bigendian = 0;
 214         sinfo.pixfmt.truecolor = 1;
 215         sinfo.pixfmt.red_max = htons(255);
 216         sinfo.pixfmt.green_max = htons(255);
 217         sinfo.pixfmt.blue_max = htons(255);
 218         sinfo.pixfmt.red_shift = 16;
 219         sinfo.pixfmt.green_shift = 8;
 220         sinfo.pixfmt.blue_shift = 0;
 221         sinfo.namelen = htonl(strlen("bhyve"));
 222         (void)stream_write(cfd, &sinfo, sizeof(sinfo));
 223         (void)stream_write(cfd, "bhyve", strlen("bhyve"));
 224 }
 225
 226 static void
 227 rfb_send_resize_update_msg(struct rfb_softc *rc, int cfd)
 228 {
 229         struct rfb_srvr_updt_msg supdt_msg;
 230         struct rfb_srvr_rect_hdr srect_hdr;
 231
 232         /* Number of rectangles: 1 */
 233         supdt_msg.type = 0;
 234         supdt_msg.pad = 0;
 235         supdt_msg.numrects = htons(1);
 236         stream_write(cfd, &supdt_msg, sizeof(struct rfb_srvr_updt_msg));
 237
 238         /* Rectangle header */
 239         srect_hdr.x = htons(0);
 240         srect_hdr.y = htons(0);
 241         srect_hdr.width = htons(rc->width);
 242         srect_hdr.height = htons(rc->height);
 243         srect_hdr.encoding = htonl(RFB_ENCODING_RESIZE);
 244         stream_write(cfd, &srect_hdr, sizeof(struct rfb_srvr_rect_hdr));
 245 }
 246
 247 static void
 248 rfb_recv_set_pixfmt_msg(struct rfb_softc *rc, int cfd)
 249 {
 250         struct rfb_pixfmt_msg pixfmt_msg;
 251
 252         (void)stream_read(cfd, ((void *)&pixfmt_msg)+1, sizeof(pixfmt_msg)-1);
 253 }
 254
 255
 256 static void
 257 rfb_recv_set_encodings_msg(struct rfb_softc *rc, int cfd)
 258 {
 259         struct rfb_enc_msg enc_msg;
 260         int i;
 261         uint32_t encoding;
 262
 263         assert((sizeof(enc_msg) - 1) == 3);
 264         (void)stream_read(cfd, ((void *)&enc_msg)+1, sizeof(enc_msg)-1);
 265
 266         for (i = 0; i < htons(enc_msg.numencs); i++) {
 267                 (void)stream_read(cfd, &encoding, sizeof(encoding));
 268                 switch (htonl(encoding)) {
 269                 case RFB_ENCODING_RAW:
 270                         rc->enc_raw_ok = true;
 271                         break;
 272                 case RFB_ENCODING_ZLIB:
 273                         if (!rc->enc_zlib_ok) {
 274                                 deflateInit(&rc->zstream, Z_BEST_SPEED);
 275                                 rc->enc_zlib_ok = true;
 276                         }
 277                         break;
 278                 case RFB_ENCODING_RESIZE:
 279                         rc->enc_resize_ok = true;
 280                         break;
 281                 }
 282         }
 283 }
 284
 285 /*
 286  * Calculate CRC32 using SSE4.2; Intel or AMD Bulldozer+ CPUs only
 287  */
 288 static __inline uint32_t
 289 fast_crc32(void *buf, int len, uint32_t crcval)
 290 {
 291         uint32_t q = len / sizeof(uint32_t);
 292         uint32_t *p = (uint32_t *)buf;
 293
 294         while (q--) {
 295                 asm volatile (
 296                         ".byte 0xf2, 0xf, 0x38, 0xf1, 0xf1;"
 297                         :"=S" (crcval)
 298                         :"0" (crcval), "c" (*p)
 299                 );
 300                 p++;
 301         }
 302
 303         return (crcval);
 304 }
 305
 306
 307 static int
 308 rfb_send_rect(struct rfb_softc *rc, int cfd, struct bhyvegc_image *gc,
 309               int x, int y, int w, int h)
 310 {
 311         struct rfb_srvr_updt_msg supdt_msg;
 312         struct rfb_srvr_rect_hdr srect_hdr;
 313         unsigned long zlen;
 314         ssize_t nwrite, total;
 315         int err;
 316         uint32_t *p;
 317         uint8_t *zbufp;
 318
 319         /*
 320          * Send a single rectangle of the given x, y, w h dimensions.
 321          */
 322
 323         /* Number of rectangles: 1 */
 324         supdt_msg.type = 0;
 325         supdt_msg.pad = 0;
 326         supdt_msg.numrects = htons(1);
 327         nwrite = stream_write(cfd, &supdt_msg,
 328                               sizeof(struct rfb_srvr_updt_msg));
 329         if (nwrite <= 0)
 330                 return (nwrite);
 331
 332
 333         /* Rectangle header */
 334         srect_hdr.x = htons(x);
 335         srect_hdr.y = htons(y);
 336         srect_hdr.width = htons(w);
 337         srect_hdr.height = htons(h);
 338
 339         h = y + h;
 340         w *= sizeof(uint32_t);
 341         if (rc->enc_zlib_ok) {
 342                 zbufp = rc->zbuf;
 343                 rc->zstream.total_in = 0;
 344                 rc->zstream.total_out = 0;
 345                 for (p = &gc->data[y * gc->width + x]; y < h; y++) {
 346                         rc->zstream.next_in = (Bytef *)p;
 347                         rc->zstream.avail_in = w;
 348                         rc->zstream.next_out = (Bytef *)zbufp;
 349                         rc->zstream.avail_out = RFB_ZLIB_BUFSZ + 16 -
 350                                                 rc->zstream.total_out;
 351                         rc->zstream.data_type = Z_BINARY;
 352
 353                         /* Compress with zlib */
 354                         err = deflate(&rc->zstream, Z_SYNC_FLUSH);
 355                         if (err != Z_OK) {
 356                                 WPRINTF(("zlib[rect] deflate err: %d\n", err));
 357                                 rc->enc_zlib_ok = false;
 358                                 deflateEnd(&rc->zstream);
 359                                 goto doraw;
 360                         }
 361                         zbufp = rc->zbuf + rc->zstream.total_out;
 362                         p += gc->width;
 363                 }
 364                 srect_hdr.encoding = htonl(RFB_ENCODING_ZLIB);
 365                 nwrite = stream_write(cfd, &srect_hdr,
 366                                       sizeof(struct rfb_srvr_rect_hdr));
 367                 if (nwrite <= 0)
 368                         return (nwrite);
 369
 370                 zlen = htonl(rc->zstream.total_out);
 371                 nwrite = stream_write(cfd, &zlen, sizeof(uint32_t));
 372                 if (nwrite <= 0)
 373                         return (nwrite);
 374                 return (stream_write(cfd, rc->zbuf, rc->zstream.total_out));
 375         }
 376
 377 doraw:
 378
 379         total = 0;
 380         zbufp = rc->zbuf;
 381         for (p = &gc->data[y * gc->width + x]; y < h; y++) {
 382                 memcpy(zbufp, p, w);
 383                 zbufp += w;
 384                 total += w;
 385                 p += gc->width;
 386         }
 387
 388         srect_hdr.encoding = htonl(RFB_ENCODING_RAW);
 389         nwrite = stream_write(cfd, &srect_hdr,
 390                               sizeof(struct rfb_srvr_rect_hdr));
 391         if (nwrite <= 0)
 392                 return (nwrite);
 393
 394         total = stream_write(cfd, rc->zbuf, total);
 395
 396         return (total);
 397 }
 398
 399 static int
 400 rfb_send_all(struct rfb_softc *rc, int cfd, struct bhyvegc_image *gc)
 401 {
 402         struct rfb_srvr_updt_msg supdt_msg;
 403         struct rfb_srvr_rect_hdr srect_hdr;
 404         ssize_t nwrite;
 405         unsigned long zlen;
 406         int err;
 407
 408         /*
 409          * Send the whole thing
 410          */
 411
 412         /* Number of rectangles: 1 */
 413         supdt_msg.type = 0;
 414         supdt_msg.pad = 0;
 415         supdt_msg.numrects = htons(1);
 416         nwrite = stream_write(cfd, &supdt_msg,
 417                               sizeof(struct rfb_srvr_updt_msg));
 418         if (nwrite <= 0)
 419                 return (nwrite);
 420
 421         /* Rectangle header */
 422         srect_hdr.x = 0;
 423         srect_hdr.y = 0;
 424         srect_hdr.width = htons(gc->width);
 425         srect_hdr.height = htons(gc->height);
 426         if (rc->enc_zlib_ok) {
 427                 rc->zstream.next_in = (Bytef *)gc->data;
 428                 rc->zstream.avail_in = gc->width * gc->height *
 429                                    sizeof(uint32_t);
 430                 rc->zstream.next_out = (Bytef *)rc->zbuf;
 431                 rc->zstream.avail_out = RFB_ZLIB_BUFSZ + 16;
 432                 rc->zstream.data_type = Z_BINARY;
 433
 434                 rc->zstream.total_in = 0;
 435                 rc->zstream.total_out = 0;
 436
 437                 /* Compress with zlib */
 438                 err = deflate(&rc->zstream, Z_SYNC_FLUSH);
 439                 if (err != Z_OK) {
 440                         WPRINTF(("zlib deflate err: %d\n", err));
 441                         rc->enc_zlib_ok = false;
 442                         deflateEnd(&rc->zstream);
 443                         goto doraw;
 444                 }
 445
 446                 srect_hdr.encoding = htonl(RFB_ENCODING_ZLIB);
 447                 nwrite = stream_write(cfd, &srect_hdr,
 448                                       sizeof(struct rfb_srvr_rect_hdr));
 449                 if (nwrite <= 0)
 450                         return (nwrite);
 451
 452                 zlen = htonl(rc->zstream.total_out);
 453                 nwrite = stream_write(cfd, &zlen, sizeof(uint32_t));
 454                 if (nwrite <= 0)
 455                         return (nwrite);
 456                 return (stream_write(cfd, rc->zbuf, rc->zstream.total_out));
 457         }
 458
 459 doraw:
 460         srect_hdr.encoding = htonl(RFB_ENCODING_RAW);
 461         nwrite = stream_write(cfd, &srect_hdr,
 462                               sizeof(struct rfb_srvr_rect_hdr));
 463         if (nwrite <= 0)
 464                 return (nwrite);
 465
 466         nwrite = stream_write(cfd, gc->data,
 467                        gc->width * gc->height * sizeof(uint32_t));
 468
 469         return (nwrite);
 470 }
 471
 472 #define PIX_PER_CELL    32
 473 #define PIXCELL_SHIFT   5
 474 #define PIXCELL_MASK    0x1F
 475
 476 static int
 477 rfb_send_screen(struct rfb_softc *rc, int cfd, int all)
 478 {
 479         struct bhyvegc_image *gc_image;
 480         ssize_t nwrite;
 481         int x, y;
 482         int celly, cellwidth;
 483         int xcells, ycells;
 484         int w, h;
 485         uint32_t *p;
 486         int rem_x, rem_y;   /* remainder for resolutions not x32 pixels ratio */
 487         int retval;
 488         uint32_t *crc_p, *orig_crc;
 489         int changes;
 490
 491         console_refresh();
 492         gc_image = console_get_image();
 493
 494         pthread_mutex_lock(&rc->mtx);
 495         if (rc->sending) {
 496                 pthread_mutex_unlock(&rc->mtx);
 497                 return (1);
 498         }
 499         rc->sending = 1;
 500         pthread_mutex_unlock(&rc->mtx);
 501
 502         retval = 0;
 503
 504         if (all) {
 505                 retval = rfb_send_all(rc, cfd, gc_image);
 506                 goto done;
 507         }
 508
 509         /*
 510          * Calculate the checksum for each 32x32 cell. Send each that
 511          * has changed since the last scan.
 512          */
 513
 514         /* Resolution changed */
 515
 516         rc->crc_width = gc_image->width;
 517         rc->crc_height = gc_image->height;
 518
 519         w = rc->crc_width;
 520         h = rc->crc_height;
 521         xcells = howmany(rc->crc_width, PIX_PER_CELL);
 522         ycells = howmany(rc->crc_height, PIX_PER_CELL);
 523
 524         rem_x = w & PIXCELL_MASK;
 525
 526         rem_y = h & PIXCELL_MASK;
 527         if (!rem_y)
 528                 rem_y = PIX_PER_CELL;
 529
 530         p = gc_image->data;
 531
 532         /*
 533          * Go through all cells and calculate crc. If significant number
 534          * of changes, then send entire screen.
 535          * crc_tmp is dual purpose: to store the new crc and to flag as
 536          * a cell that has changed.
 537          */
 538         crc_p = rc->crc_tmp - xcells;
 539         orig_crc = rc->crc - xcells;
 540         changes = 0;
 541         memset(rc->crc_tmp, 0, sizeof(uint32_t) * xcells * ycells);
 542         for (y = 0; y < h; y++) {
 543                 if ((y & PIXCELL_MASK) == 0) {
 544                         crc_p += xcells;
 545                         orig_crc += xcells;
 546                 }
 547
 548                 for (x = 0; x < xcells; x++) {
 549                         if (x == (xcells - 1) && rem_x > 0)
 550                                 cellwidth = rem_x;
 551                         else
 552                                 cellwidth = PIX_PER_CELL;
 553
 554                         if (rc->hw_crc)
 555                                 crc_p[x] = fast_crc32(p,
 556                                              cellwidth * sizeof(uint32_t),
 557                                              crc_p[x]);
 558                         else
 559                                 crc_p[x] = (uint32_t)crc32(crc_p[x],
 560                                              (Bytef *)p,
 561                                              cellwidth * sizeof(uint32_t));
 562
 563                         p += cellwidth;
 564
 565                         /* check for crc delta if last row in cell */
 566                         if ((y & PIXCELL_MASK) == PIXCELL_MASK || y == (h-1)) {
 567                                 if (orig_crc[x] != crc_p[x]) {
 568                                         orig_crc[x] = crc_p[x];
 569                                         crc_p[x] = 1;
 570                                         changes++;
 571                                 } else {
 572                                         crc_p[x] = 0;
 573                                 }
 574                         }
 575                 }
 576         }
 577
 578         /* If number of changes is > THRESH percent, send the whole screen */
 579         if (((changes * 100) / (xcells * ycells)) >= RFB_SEND_ALL_THRESH) {
 580                 retval = rfb_send_all(rc, cfd, gc_image);
 581                 goto done;
 582         }
 583
 584         /* Go through all cells, and send only changed ones */
 585         crc_p = rc->crc_tmp;
 586         for (y = 0; y < h; y += PIX_PER_CELL) {
 587                 /* previous cell's row */
 588                 celly = (y >> PIXCELL_SHIFT);
 589
 590                 /* Delta check crc to previous set */
 591                 for (x = 0; x < xcells; x++) {
 592                         if (*crc_p++ == 0)
 593                                 continue;
 594
 595                         if (x == (xcells - 1) && rem_x > 0)
 596                                 cellwidth = rem_x;
 597                         else
 598                                 cellwidth = PIX_PER_CELL;
 599                         nwrite = rfb_send_rect(rc, cfd,
 600                                 gc_image,
 601                                 x * PIX_PER_CELL,
 602                                 celly * PIX_PER_CELL,
 603                                 cellwidth,
 604                                 y + PIX_PER_CELL >= h ? rem_y : PIX_PER_CELL);
 605                         if (nwrite <= 0) {
 606                                 retval = nwrite;
 607                                 goto done;
 608                         }
 609                 }
 610         }
 611         retval = 1;
 612
 613 done:
 614         pthread_mutex_lock(&rc->mtx);
 615         rc->sending = 0;
 616         pthread_mutex_unlock(&rc->mtx);
 617
 618         return (retval);
 619 }
 620
 621
 622 static void
 623 rfb_recv_update_msg(struct rfb_softc *rc, int cfd, int discardonly)
 624 {
 625         struct rfb_updt_msg updt_msg;
 626         struct bhyvegc_image *gc_image;
 627
 628         (void)stream_read(cfd, ((void *)&updt_msg) + 1 , sizeof(updt_msg) - 1);
 629
 630         console_refresh();
 631         gc_image = console_get_image();
 632
 633         updt_msg.x = htons(updt_msg.x);
 634         updt_msg.y = htons(updt_msg.y);
 635         updt_msg.width = htons(updt_msg.width);
 636         updt_msg.height = htons(updt_msg.height);
 637
 638         if (updt_msg.width != gc_image->width ||
 639             updt_msg.height != gc_image->height) {
 640                 rc->width = gc_image->width;
 641                 rc->height = gc_image->height;
 642                 if (rc->enc_resize_ok)
 643                         rfb_send_resize_update_msg(rc, cfd);
 644         }
 645
 646         if (discardonly)
 647                 return;
 648
 649         rfb_send_screen(rc, cfd, 1);
 650 }
 651
 652 static void
 653 rfb_recv_key_msg(struct rfb_softc *rc, int cfd)
 654 {
 655         struct rfb_key_msg key_msg;
 656
 657         (void)stream_read(cfd, ((void *)&key_msg) + 1, sizeof(key_msg) - 1);
 658
 659         console_key_event(key_msg.down, htonl(key_msg.code));
 660 }
 661
 662 static void
 663 rfb_recv_ptr_msg(struct rfb_softc *rc, int cfd)
 664 {
 665         struct rfb_ptr_msg ptr_msg;
 666
 667         (void)stream_read(cfd, ((void *)&ptr_msg) + 1, sizeof(ptr_msg) - 1);
 668
 669         console_ptr_event(ptr_msg.button, htons(ptr_msg.x), htons(ptr_msg.y));
 670 }
 671
 672 static void
 673 rfb_recv_cuttext_msg(struct rfb_softc *rc, int cfd)
 674 {
 675         struct rfb_cuttext_msg ct_msg;
 676         unsigned char buf[32];
 677         int len;
 678
 679         len = stream_read(cfd, ((void *)&ct_msg) + 1, sizeof(ct_msg) - 1);
 680         ct_msg.length = htonl(ct_msg.length);
 681         while (ct_msg.length > 0) {
 682                 len = stream_read(cfd, buf, ct_msg.length > sizeof(buf) ?
 683                         sizeof(buf) : ct_msg.length);
 684                 ct_msg.length -= len;
 685         }
 686 }
 687
 688 static int64_t
 689 timeval_delta(struct timeval *prev, struct timeval *now)
 690 {
 691         int64_t n1, n2;
 692         n1 = now->tv_sec * 1000000 + now->tv_usec;
 693         n2 = prev->tv_sec * 1000000 + prev->tv_usec;
 694         return (n1 - n2);
 695 }
 696
 697 static void *
 698 rfb_wr_thr(void *arg)
 699 {
 700         struct rfb_softc *rc;
 701         fd_set rfds;
 702         struct timeval tv;
 703         struct timeval prev_tv;
 704         int64_t tdiff;
 705         int cfd;
 706         int err;
 707
 708         rc = arg;
 709         cfd = rc->cfd;
 710
 711         prev_tv.tv_sec = 0;
 712         prev_tv.tv_usec = 0;
 713         while (rc->cfd >= 0) {
 714                 FD_ZERO(&rfds);
 715                 FD_SET(cfd, &rfds);
 716                 tv.tv_sec = 0;
 717                 tv.tv_usec = 10000;
 718
 719                 err = select(cfd+1, &rfds, NULL, NULL, &tv);
 720                 if (err < 0)
 721                         return (NULL);
 722
 723                 /* Determine if its time to push screen; ~24hz */
 724                 gettimeofday(&tv, NULL);
 725                 tdiff = timeval_delta(&prev_tv, &tv);
 726                 if (tdiff > 40000) {
 727                         prev_tv.tv_sec = tv.tv_sec;
 728                         prev_tv.tv_usec = tv.tv_usec;
 729                         if (rfb_send_screen(rc, cfd, 0) <= 0) {
 730                                 return (NULL);
 731                         }
 732                 } else {
 733                         /* sleep */
 734                         usleep(40000 - tdiff);
 735                 }
 736         }
 737
 738         return (NULL);
 739 }
 740
 741 void
 742 rfb_handle(struct rfb_softc *rc, int cfd)
 743 {
 744         const char *vbuf = "RFB 003.008\n";
 745         unsigned char buf[80];
 746         unsigned char *message = NULL;
 747
 748 #ifndef NO_OPENSSL
 749         unsigned char challenge[AUTH_LENGTH];
 750         unsigned char keystr[PASSWD_LENGTH];
 751         unsigned char crypt_expected[AUTH_LENGTH];
 752
 753         DES_key_schedule ks;
 754         int i;
 755 #endif
 756
 757         pthread_t tid;
 758         uint32_t sres = 0;
 759         int len;
 760         int perror = 1;
 761
 762         rc->cfd = cfd;
 763
 764         /* 1a. Send server version */
 765         stream_write(cfd, vbuf, strlen(vbuf));
 766
 767         /* 1b. Read client version */
 768         len = read(cfd, buf, sizeof(buf));
 769
 770         /* 2a. Send security type */
 771         buf[0] = 1;
 772 #ifndef NO_OPENSSL
 773         if (rc->password)
 774                 buf[1] = SECURITY_TYPE_VNC_AUTH;
 775         else
 776                 buf[1] = SECURITY_TYPE_NONE;
 777 #else
 778         buf[1] = SECURITY_TYPE_NONE;
 779 #endif
 780
 781         stream_write(cfd, buf, 2);
 782
 783         /* 2b. Read agreed security type */
 784         len = stream_read(cfd, buf, 1);
 785
 786         /* 2c. Do VNC authentication */
 787         switch (buf[0]) {
 788         case SECURITY_TYPE_NONE:
 789                 sres = 0;
 790                 break;
 791         case SECURITY_TYPE_VNC_AUTH:
 792                 /*
 793                  * The client encrypts the challenge with DES, using a password
 794                  * supplied by the user as the key.
 795                  * To form the key, the password is truncated to
 796                  * eight characters, or padded with null bytes on the right.
 797                  * The client then sends the resulting 16-bytes response.
 798                  */
 799 #ifndef NO_OPENSSL
 800                 strncpy(keystr, rc->password, PASSWD_LENGTH);
 801
 802                 /* VNC clients encrypts the challenge with all the bit fields
 803                  * in each byte of the password mirrored.
 804                  * Here we flip each byte of the keystr.
 805                  */
 806                 for (i = 0; i < PASSWD_LENGTH; i++) {
 807                         keystr[i] = (keystr[i] & 0xF0) >> 4
 808                                   | (keystr[i] & 0x0F) << 4;
 809                         keystr[i] = (keystr[i] & 0xCC) >> 2
 810                                   | (keystr[i] & 0x33) << 2;
 811                         keystr[i] = (keystr[i] & 0xAA) >> 1
 812                                   | (keystr[i] & 0x55) << 1;
 813                 }
 814
 815                 /* Initialize a 16-byte random challenge */
 816                 arc4random_buf(challenge, sizeof(challenge));
 817                 stream_write(cfd, challenge, AUTH_LENGTH);
 818
 819                 /* Receive the 16-byte challenge response */
 820                 stream_read(cfd, buf, AUTH_LENGTH);
 821
 822                 memcpy(crypt_expected, challenge, AUTH_LENGTH);
 823
 824                 /* Encrypt the Challenge with DES */
 825                 DES_set_key((const_DES_cblock *)keystr, &ks);
 826                 DES_ecb_encrypt((const_DES_cblock *)challenge,
 827                                 (const_DES_cblock *)crypt_expected,
 828                                 &ks, DES_ENCRYPT);
 829                 DES_ecb_encrypt((const_DES_cblock *)(challenge + PASSWD_LENGTH),
 830                                 (const_DES_cblock *)(crypt_expected +
 831                                 PASSWD_LENGTH),
 832                                 &ks, DES_ENCRYPT);
 833
 834                 if (memcmp(crypt_expected, buf, AUTH_LENGTH) != 0) {
 835                         message = "Auth Failed: Invalid Password.";
 836                         sres = htonl(1);
 837                 } else
 838                         sres = 0;
 839 #else
 840                 sres = 0;
 841                 WPRINTF(("Auth not supported, no OpenSSL in your system"));
 842 #endif
 843
 844                 break;
 845         }
 846
 847         /* 2d. Write back a status */
 848         stream_write(cfd, &sres, 4);
 849
 850         if (sres) {
 851                 be32enc(buf, strlen(message));
 852                 stream_write(cfd, buf, 4);
 853                 stream_write(cfd, message, strlen(message));
 854                 goto done;
 855         }
 856
 857         /* 3a. Read client shared-flag byte */
 858         len = stream_read(cfd, buf, 1);
 859
 860         /* 4a. Write server-init info */
 861         rfb_send_server_init_msg(cfd);
 862
 863         if (!rc->zbuf) {
 864                 rc->zbuf = malloc(RFB_ZLIB_BUFSZ + 16);
 865                 assert(rc->zbuf != NULL);
 866         }
 867
 868         rfb_send_screen(rc, cfd, 1);
 869
 870         perror = pthread_create(&tid, NULL, rfb_wr_thr, rc);
 871         if (perror == 0)
 872                 pthread_set_name_np(tid, "rfbout");
 873
 874         /* Now read in client requests. 1st byte identifies type */
 875         for (;;) {
 876                 len = read(cfd, buf, 1);
 877                 if (len <= 0) {
 878                         DPRINTF(("rfb client exiting\r\n"));
 879                         break;
 880                 }
 881
 882                 switch (buf[0]) {
 883                 case 0:
 884                         rfb_recv_set_pixfmt_msg(rc, cfd);
 885                         break;
 886                 case 2:
 887                         rfb_recv_set_encodings_msg(rc, cfd);
 888                         break;
 889                 case 3:
 890                         rfb_recv_update_msg(rc, cfd, 1);
 891                         break;
 892                 case 4:
 893                         rfb_recv_key_msg(rc, cfd);
 894                         break;
 895                 case 5:
 896                         rfb_recv_ptr_msg(rc, cfd);
 897                         break;
 898                 case 6:
 899                         rfb_recv_cuttext_msg(rc, cfd);
 900                         break;
 901                 default:
 902                         WPRINTF(("rfb unknown cli-code %d!\n", buf[0] & 0xff));
 903                         goto done;
 904                 }
 905         }
 906 done:
 907         rc->cfd = -1;
 908         if (perror == 0)
 909                 pthread_join(tid, NULL);
 910         if (rc->enc_zlib_ok)
 911                 deflateEnd(&rc->zstream);
 912 }
 913
 914 static void *
 915 rfb_thr(void *arg)
 916 {
 917         struct rfb_softc *rc;
 918         sigset_t set;
 919
 920         int cfd;
 921
 922         rc = arg;
 923
 924         sigemptyset(&set);
 925         sigaddset(&set, SIGPIPE);
 926         if (pthread_sigmask(SIG_BLOCK, &set, NULL) != 0) {
 927                 perror("pthread_sigmask");
 928                 return (NULL);
 929         }
 930
 931         for (;;) {
 932                 rc->enc_raw_ok = false;
 933                 rc->enc_zlib_ok = false;
 934                 rc->enc_resize_ok = false;
 935
 936                 cfd = accept(rc->sfd, NULL, NULL);
 937                 if (rc->conn_wait) {
 938                         pthread_mutex_lock(&rc->mtx);
 939                         pthread_cond_signal(&rc->cond);
 940                         pthread_mutex_unlock(&rc->mtx);
 941                         rc->conn_wait = 0;
 942                 }
 943                 rfb_handle(rc, cfd);
 944                 close(cfd);
 945         }
 946
 947         /* NOTREACHED */
 948         return (NULL);
 949 }
 950
 951 static int
 952 sse42_supported(void)
 953 {
 954         u_int cpu_registers[4], ecx;
 955
 956         do_cpuid(1, cpu_registers);
 957
 958         ecx = cpu_registers[2];
 959
 960         return ((ecx & CPUID2_SSE42) != 0);
 961 }
 962
 963 int
 964 rfb_init(char *hostname, int port, int wait, char *password)
 965 {
 966         int e;
 967         char servname[6];
 968         struct rfb_softc *rc;
 969         struct addrinfo *ai;
 970         struct addrinfo hints;
 971         int on = 1;
 972 #ifndef WITHOUT_CAPSICUM
 973         cap_rights_t rights;
 974 #endif
 975
 976         rc = calloc(1, sizeof(struct rfb_softc));
 977
 978         rc->crc = calloc(howmany(RFB_MAX_WIDTH * RFB_MAX_HEIGHT, 32),
 979                          sizeof(uint32_t));
 980         rc->crc_tmp = calloc(howmany(RFB_MAX_WIDTH * RFB_MAX_HEIGHT, 32),
 981                              sizeof(uint32_t));
 982         rc->crc_width = RFB_MAX_WIDTH;
 983         rc->crc_height = RFB_MAX_HEIGHT;
 984
 985         rc->password = password;
 986
 987         snprintf(servname, sizeof(servname), "%d", port ? port : 5900);
 988
 989         if (!hostname || strlen(hostname) == 0)
 990 #if defined(INET)
 991                 hostname = "127.0.0.1";
 992 #elif defined(INET6)
 993                 hostname = "[::1]";
 994 #endif
 995
 996         memset(&hints, 0, sizeof(hints));
 997         hints.ai_family = AF_UNSPEC;
 998         hints.ai_socktype = SOCK_STREAM;
 999         hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV | AI_PASSIVE;
1000
1001         if ((e = getaddrinfo(hostname, servname, &hints, &ai)) != 0) {
1002                 fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(e));
1003                 return(-1);
1004         }
1005
1006         rc->sfd = socket(ai->ai_family, ai->ai_socktype, 0);
1007         if (rc->sfd < 0) {
1008                 perror("socket");
1009                 freeaddrinfo(ai);
1010                 return (-1);
1011         }
1012
1013         setsockopt(rc->sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
1014
1015         if (bind(rc->sfd, ai->ai_addr, ai->ai_addrlen) < 0) {
1016                 perror("bind");
1017                 freeaddrinfo(ai);
1018                 return (-1);
1019         }
1020
1021         if (listen(rc->sfd, 1) < 0) {
1022                 perror("listen");
1023                 freeaddrinfo(ai);
1024                 return (-1);
1025         }
1026
1027 #ifndef WITHOUT_CAPSICUM
1028         cap_rights_init(&rights, CAP_ACCEPT, CAP_EVENT, CAP_READ, CAP_WRITE);
1029         if (cap_rights_limit(rc->sfd, &rights) == -1 && errno != ENOSYS)
1030                 errx(EX_OSERR, "Unable to apply rights for sandbox");
1031 #endif
1032
1033         rc->hw_crc = sse42_supported();
1034
1035         rc->conn_wait = wait;
1036         if (wait) {
1037                 pthread_mutex_init(&rc->mtx, NULL);
1038                 pthread_cond_init(&rc->cond, NULL);
1039         }
1040
1041         pthread_create(&rc->tid, NULL, rfb_thr, rc);
1042         pthread_set_name_np(rc->tid, "rfb");
1043
1044         if (wait) {
1045                 DPRINTF(("Waiting for rfb client...\n"));
1046                 pthread_mutex_lock(&rc->mtx);
1047                 pthread_cond_wait(&rc->cond, &rc->mtx);
1048                 pthread_mutex_unlock(&rc->mtx);
1049         }
1050
1051         freeaddrinfo(ai);
1052         return (0);
1053 }