granicus.if.org Git - strace/blob - evdev.c

   1 /*
   2  * Copyright (c) 2015 Etienne Gemsa <etienne.gemsa@lse.epita.fr>
   3  * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "defs.h"
  30
  31 #ifdef HAVE_LINUX_INPUT_H
  32
  33 # include <linux/ioctl.h>
  34 # include <linux/input.h>
  35 # include "xlat/evdev_abs.h"
  36 # include "xlat/evdev_autorepeat.h"
  37 # include "xlat/evdev_ff_status.h"
  38 # include "xlat/evdev_ff_types.h"
  39 # include "xlat/evdev_keycode.h"
  40 # include "xlat/evdev_leds.h"
  41 # include "xlat/evdev_misc.h"
  42 # include "xlat/evdev_mtslots.h"
  43 # include "xlat/evdev_prop.h"
  44 # include "xlat/evdev_relative_axes.h"
  45 # include "xlat/evdev_snd.h"
  46 # include "xlat/evdev_switch.h"
  47 # include "xlat/evdev_sync.h"
  48
  49 # ifndef SYN_MAX
  50 #  define SYN_MAX 0xf
  51 # endif
  52
  53 static void
  54 decode_envelope(struct ff_envelope *envelope)
  55 {
  56         tprintf(", envelope={attack_length=%" PRIu16 ", attack_level=%" PRIu16
  57                 ", fade_length=%" PRIu16 ", fade_level=%" PRIx32 "}",
  58                 envelope->attack_length,
  59                 envelope->attack_level,
  60                 envelope->fade_length,
  61                 envelope->fade_level);
  62 }
  63
  64 static int
  65 ff_effect_ioctl(struct tcb *tcp, long arg)
  66 {
  67         struct ff_effect ffe;
  68
  69         if (!verbose(tcp) || umove(tcp, arg, &ffe) < 0)
  70                 return 0;
  71
  72         tprints(", {type=");
  73         printxval(evdev_ff_types, ffe.type, "FF_???");
  74         tprintf(", id=%" PRIu16 ", direction=%" PRIu16,
  75                 ffe.id, ffe.direction);
  76
  77         if (!abbrev(tcp)) {
  78                 tprintf(", trigger={button=%" PRIu16 ", interval=%" PRIu16 "}",
  79                         ffe.trigger.button, ffe.trigger.interval);
  80                 tprintf(", replay={lenght=%" PRIu16 ", delay=%" PRIu16 "}",
  81                         ffe.replay.length, ffe.replay.delay);
  82                 switch (ffe.type) {
  83                         case FF_CONSTANT:
  84                                 tprintf(", constant_ef={%" PRIi16,
  85                                         ffe.u.constant.level);
  86                                 decode_envelope(&ffe.u.constant.envelope);
  87                                 tprints("}");
  88                                 return 1;
  89                         case FF_RAMP:
  90                                 tprintf(", ramp={start_level=%" PRIi16
  91                                         ", end_level=%" PRIi16,
  92                                         ffe.u.ramp.start_level,
  93                                         ffe.u.ramp.end_level);
  94                                 decode_envelope(&ffe.u.ramp.envelope);
  95                                 tprints("}");
  96                                 return 1;
  97                         case FF_PERIODIC:
  98                                 tprintf(", periodic_ef={waveform=%" PRIu16
  99                                         ", period=%" PRIu16
 100                                         ", magnitude=%" PRIi16
 101                                         ", offset=%" PRIi16
 102                                         ", phase=%" PRIu16,
 103                                         ffe.u.periodic.waveform,
 104                                         ffe.u.periodic.period,
 105                                         ffe.u.periodic.magnitude,
 106                                         ffe.u.periodic.offset,
 107                                         ffe.u.periodic.phase);
 108                                 decode_envelope(&ffe.u.periodic.envelope);
 109                                 tprintf(", custom_len=%" PRIu32
 110                                         ", *custom_data=%#lx}",
 111                                         ffe.u.periodic.custom_len,
 112                                         (unsigned long)ffe.u.periodic.custom_data);
 113                                 return 1;
 114                         case FF_RUMBLE:
 115                                 tprintf(", rumble={strong_magnitude=%" PRIu16
 116                                         ", weak_magnitude=%" PRIu16 "}",
 117                                         ffe.u.rumble.strong_magnitude,
 118                                         ffe.u.rumble.weak_magnitude);
 119                                 return 1;
 120                         case FF_SPRING:
 121                         case FF_FRICTION:
 122                         case FF_DAMPER:
 123                         case FF_INERTIA:
 124                         case FF_CUSTOM:
 125                                 break;
 126                         default :
 127                                 break;
 128                 }
 129         }
 130
 131         tprints(", ...}");
 132         return 1;
 133 }
 134
 135 static int
 136 abs_ioctl(struct tcb *tcp, long arg)
 137 {
 138         struct input_absinfo absinfo;
 139
 140         if (!verbose(tcp) || umove(tcp, arg, &absinfo) < 0)
 141                 return 0;
 142
 143         tprintf(", {value=%" PRIu32 ", minimum=%" PRIu32,
 144                 absinfo.value, absinfo.minimum);
 145         if (!abbrev(tcp)) {
 146                 tprintf(", maximum=%" PRIu32 ", fuzz=%" PRIu32,
 147                         absinfo.maximum, absinfo.fuzz);
 148                 tprintf(", flat=%" PRIu32, absinfo.flat);
 149 # ifdef HAVE_STRUCT_INPUT_ABSINFO_RESOLUTION
 150                 tprintf(", resolution=%" PRIu32, absinfo.resolution);
 151 # endif
 152                 tprints("}");
 153         } else {
 154                 tprints(", ...}");
 155         }
 156         return 1;
 157 }
 158
 159 static int
 160 keycode_ioctl(struct tcb *tcp, long arg)
 161 {
 162         unsigned int keycode[2];
 163
 164         if (!arg) {
 165                 tprints(", NULL");
 166                 return 1;
 167         }
 168
 169         if (!verbose(tcp) || umove(tcp, arg, &keycode) < 0)
 170                 return 0;
 171
 172         tprintf(", [%u, ", keycode[0]);
 173         printxval(evdev_keycode, keycode[1], "KEY_???");
 174         tprints("]");
 175         return 1;
 176 }
 177
 178 # ifdef EVIOCGKEYCODE_V2
 179 static int
 180 keycode_V2_ioctl(struct tcb *tcp, long arg)
 181 {
 182         struct input_keymap_entry ike;
 183
 184         if (!arg) {
 185                 tprints(", NULL");
 186                 return 1;
 187         }
 188
 189         if (!verbose(tcp) || umove(tcp, arg, &ike) < 0)
 190                 return 0;
 191
 192         tprintf(", {flags=%" PRIu8 ", len=%" PRIu8, ike.flags, ike.len);
 193         if (!abbrev(tcp)) {
 194                 unsigned int i;
 195
 196                 tprintf(", index=%" PRIu16 ", keycode=", ike.index);
 197                 printxval(evdev_keycode, ike.keycode, "KEY_???");
 198                 tprints(", scancode=[");
 199                 for (i = 0; i < ARRAY_SIZE(ike.scancode); i++) {
 200                         if (i > 0)
 201                                 tprints(", ");
 202                         tprintf("%" PRIx8, ike.scancode[i]);
 203                 }
 204                 tprints("]}");
 205         } else {
 206                 tprints(", ...}");
 207         }
 208         return 1;
 209 }
 210 # endif /* EVIOCGKEYCODE_V2 */
 211
 212 static int
 213 getid_ioctl(struct tcb *tcp, long arg)
 214 {
 215         struct input_id id;
 216
 217         if (!verbose(tcp) || umove(tcp, arg, &id) < 0)
 218                 return 0;
 219
 220         tprintf(", {ID_BUS=%" PRIu16 ", ID_VENDOR=%" PRIu16,
 221                 id.bustype, id.vendor);
 222         if (!abbrev(tcp)) {
 223                 tprintf(", ID_PRODUCT=%" PRIu16 ", ID_VERSION=%" PRIu16 "}",
 224                         id.product, id.version);
 225         } else {
 226                 tprints(", ...}");
 227         }
 228         return 1;
 229 }
 230
 231 static int
 232 decode_bitset(struct tcb *tcp, long arg, const struct xlat decode_nr[],
 233               const unsigned int max_nr, const char *dflt)
 234 {
 235         if (!verbose(tcp))
 236                 return 0;
 237
 238         unsigned int size;
 239         if ((unsigned long) tcp->u_rval > max_nr)
 240                 size = max_nr;
 241         else
 242                 size = tcp->u_rval;
 243         char decoded_arg[size];
 244
 245         if (umoven(tcp, arg, size, decoded_arg) < 0)
 246                 return 0;
 247
 248         tprints(", [");
 249
 250         int bit_displayed = 0;
 251         int i = next_set_bit(decoded_arg, 0, size);
 252         if (i < 0) {
 253                 tprints(" 0 ");
 254         } else {
 255                 printxval(decode_nr, i, dflt);
 256
 257                 while ((i = next_set_bit(decoded_arg, i + 1, size)) > 0) {
 258                         if (abbrev(tcp) && bit_displayed >= 3) {
 259                                 tprints(", ...");
 260                                 break;
 261                         }
 262                         tprints(", ");
 263                         printxval(decode_nr, i, dflt);
 264                         bit_displayed++;
 265                 }
 266         }
 267
 268         tprints("]");
 269
 270         return 1;
 271 }
 272
 273 # ifdef EVIOCGMTSLOTS
 274 static int
 275 mtslots_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 276 {
 277         const size_t size = _IOC_SIZE(code) / sizeof(int32_t);
 278         if (!size)
 279                 return 0;
 280
 281         int32_t buffer[size];
 282
 283         if (!verbose(tcp) || umove(tcp, arg, &buffer) < 0)
 284                 return 0;
 285
 286         tprints(", {code=");
 287         printxval(evdev_mtslots, buffer[0], "ABS_MT_???");
 288
 289         unsigned int i;
 290         tprints(", values=[");
 291
 292         for (i = 1; i < ARRAY_SIZE(buffer); i++)
 293                 tprintf("%s%d", i > 1 ? ", " : "", buffer[i]);
 294
 295         tprints("]}");
 296         return 1;
 297 }
 298 # endif /* EVIOCGMTSLOTS */
 299
 300 # if defined EVIOCGREP || defined EVIOCSREP
 301 static int
 302 repeat_ioctl(struct tcb *tcp, long arg)
 303 {
 304         tprints(", ");
 305         printpair_int(tcp, arg, "%u");
 306         return 1;
 307 }
 308 # endif /* EVIOCGREP || EVIOCSREP */
 309
 310 static int
 311 evdev_read_ioctl(struct tcb *tcp, const unsigned int code, const long arg)
 312 {
 313         if (syserror(tcp))
 314                 return 0;
 315
 316         /* fixed-number fixed-length commands */
 317         switch (code) {
 318                 case EVIOCGVERSION:
 319                         tprints(", ");
 320                         printnum_int(tcp, arg, "%" PRIx32);
 321                         return 1;
 322                 case EVIOCGEFFECTS:
 323                         tprints(", ");
 324                         printnum_int(tcp, arg, "%" PRIu32);
 325                         return 1;
 326                 case EVIOCGID:
 327                         return getid_ioctl(tcp, arg);
 328 # ifdef EVIOCGREP
 329                 case EVIOCGREP:
 330                         return repeat_ioctl(tcp, arg);;
 331 # endif
 332                 case EVIOCGKEYCODE:
 333                         return keycode_ioctl(tcp, arg);
 334 # ifdef EVIOCGKEYCODE_V2
 335                 case EVIOCGKEYCODE_V2:
 336                         return keycode_V2_ioctl(tcp, arg);
 337 # endif
 338         }
 339
 340         /* fixed-number variable-length commands */
 341         switch (_IOC_NR(code)) {
 342 # ifdef EVIOCGMTSLOTS
 343                 case _IOC_NR(EVIOCGMTSLOTS(0)):
 344                         return mtslots_ioctl(tcp, code, arg);
 345 # endif
 346                 case _IOC_NR(EVIOCGNAME(0)):
 347                 case _IOC_NR(EVIOCGPHYS(0)):
 348                 case _IOC_NR(EVIOCGUNIQ(0)):
 349                         tprints(", ");
 350                         printstr(tcp, arg, tcp->u_rval - 1);
 351                         return 1;
 352 # ifdef EVIOCGPROP
 353                 case _IOC_NR(EVIOCGPROP(0)):
 354                         return decode_bitset(tcp, arg,
 355                                         evdev_prop, INPUT_PROP_MAX, "PROP_???");
 356 # endif
 357                 case _IOC_NR(EVIOCGSND(0)):
 358                         return decode_bitset(tcp, arg,
 359                                         evdev_snd, SND_MAX, "SND_???");
 360 # ifdef EVIOCGSW
 361                 case _IOC_NR(EVIOCGSW(0)):
 362                         return decode_bitset(tcp, arg,
 363                                         evdev_switch, SW_MAX, "SW_???");
 364 # endif
 365                 case _IOC_NR(EVIOCGKEY(0)):
 366                         return decode_bitset(tcp, arg,
 367                                         evdev_keycode, KEY_MAX, "KEY_???");
 368                 case _IOC_NR(EVIOCGLED(0)):
 369                         return decode_bitset(tcp, arg,
 370                                         evdev_leds, LED_MAX, "LED_???");
 371         }
 372
 373         /* multi-number fixed-length commands */
 374         if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0)))
 375                 return abs_ioctl(tcp, arg);
 376
 377         /* multi-number variable-length commands */
 378         if ((_IOC_NR(code) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) {
 379                 switch (_IOC_NR(code) - 0x20) {
 380                         case EV_SYN:
 381                                 return decode_bitset(tcp, arg, evdev_sync,
 382                                                 SYN_MAX, "SYN_???");
 383                         case EV_KEY:
 384                                 return decode_bitset(tcp, arg, evdev_keycode,
 385                                                 KEY_MAX, "KEY_???");
 386                         case EV_REL:
 387                                 return decode_bitset(tcp, arg, evdev_relative_axes,
 388                                                 REL_MAX, "REL_???");
 389                         case EV_ABS:
 390                                 return decode_bitset(tcp, arg,
 391                                                 evdev_abs, ABS_MAX, "ABS_???");
 392                         case EV_MSC:
 393                                 return decode_bitset(tcp, arg,
 394                                                 evdev_misc, MSC_MAX, "MSC_???");
 395 # ifdef EV_SW
 396                         case EV_SW:
 397                                 return decode_bitset(tcp, arg,
 398                                                 evdev_switch, SW_MAX, "SW_???");
 399 # endif
 400                         case EV_LED:
 401                                 return decode_bitset(tcp, arg,
 402                                                 evdev_leds, LED_MAX, "LED_???");
 403                         case EV_SND:
 404                                 return decode_bitset(tcp, arg,
 405                                                 evdev_snd, SND_MAX, "SND_???");
 406                         case EV_REP:
 407                                 return decode_bitset(tcp, arg, evdev_autorepeat,
 408                                                 REP_MAX, "REP_???");
 409                         case EV_FF:
 410                                 return decode_bitset(tcp, arg, evdev_ff_types,
 411                                                 FF_MAX, "FF_???");
 412                         case EV_PWR:
 413                                 printnum_int(tcp, arg, "%d");
 414                                 return 1;
 415                         case EV_FF_STATUS:
 416                                 return decode_bitset(tcp, arg, evdev_ff_status,
 417                                                 FF_STATUS_MAX, "FF_STATUS_???");
 418                         default:
 419                                 return 0;
 420                 }
 421         }
 422
 423         return 0;
 424 }
 425
 426 static int
 427 evdev_write_ioctl(struct tcb *tcp, const unsigned int code, const long arg)
 428 {
 429         /* fixed-number fixed-length commands */
 430         switch (code) {
 431 # ifdef EVIOCSREP
 432                 case EVIOCSREP:
 433                         return repeat_ioctl(tcp, arg);
 434 # endif
 435                 case EVIOCSKEYCODE:
 436                         return keycode_ioctl(tcp, arg);
 437 # ifdef EVIOCSKEYCODE_V2
 438                 case EVIOCSKEYCODE_V2:
 439                         return keycode_V2_ioctl(tcp, arg);
 440 # endif
 441                 case EVIOCSFF:
 442                         return ff_effect_ioctl(tcp, arg);
 443                 case EVIOCRMFF:
 444 # ifdef EVIOCSCLOCKID
 445                 case EVIOCSCLOCKID:
 446 # endif
 447                 case EVIOCGRAB:
 448 # ifdef EVIOCREVOKE
 449                 case EVIOCREVOKE:
 450 # endif
 451                         tprints(", ");
 452                         printnum_int(tcp, arg, "%u");
 453                         return 1;
 454         }
 455
 456         /* multi-number fixed-length commands */
 457         if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0)))
 458                 return abs_ioctl(tcp, arg);
 459
 460         return 0;
 461 }
 462
 463 int
 464 evdev_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 465 {
 466         switch(_IOC_DIR(code)) {
 467                 case _IOC_READ:
 468                         if (entering(tcp))
 469                                 return 0;
 470                         return evdev_read_ioctl(tcp, code, arg);
 471                 case _IOC_WRITE:
 472                         return evdev_write_ioctl(tcp, code, arg) | RVAL_DECODED;
 473                 default:
 474                         return RVAL_DECODED;
 475         }
 476 }
 477
 478 #endif /* HAVE_LINUX_INPUT_H */