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 #include <linux/input.h>
  33 #include "xlat/evdev_abs.h"
  34 #include "xlat/evdev_autorepeat.h"
  35 #include "xlat/evdev_ff_status.h"
  36 #include "xlat/evdev_ff_types.h"
  37 #include "xlat/evdev_keycode.h"
  38 #include "xlat/evdev_leds.h"
  39 #include "xlat/evdev_misc.h"
  40 #include "xlat/evdev_mtslots.h"
  41 #include "xlat/evdev_prop.h"
  42 #include "xlat/evdev_relative_axes.h"
  43 #include "xlat/evdev_snd.h"
  44 #include "xlat/evdev_switch.h"
  45 #include "xlat/evdev_sync.h"
  46
  47 #ifndef SYN_MAX
  48 # define SYN_MAX 0xf
  49 #endif
  50
  51 static void
  52 decode_envelope(struct ff_envelope *envelope)
  53 {
  54         tprintf(", envelope={attack_length=%" PRIu16 ", attack_level=%" PRIu16
  55                 ", fade_length=%" PRIu16 ", fade_level=%" PRIx32 "}",
  56                 envelope->attack_length,
  57                 envelope->attack_level,
  58                 envelope->fade_length,
  59                 envelope->fade_level);
  60 }
  61
  62 static int
  63 ff_effect_ioctl(struct tcb *tcp, long arg)
  64 {
  65         struct ff_effect ffe;
  66
  67         if (!verbose(tcp) || umove(tcp, arg, &ffe) < 0)
  68                 return 0;
  69
  70         tprints(", {type=");
  71         printxval(evdev_ff_types, ffe.type, "FF_???");
  72         tprintf(", id=%" PRIu16 ", direction=%" PRIu16,
  73                 ffe.id, ffe.direction);
  74
  75         if (!abbrev(tcp)) {
  76                 tprintf(", trigger={button=%" PRIu16 ", interval=%" PRIu16 "}",
  77                         ffe.trigger.button, ffe.trigger.interval);
  78                 tprintf(", replay={lenght=%" PRIu16 ", delay=%" PRIu16 "}",
  79                         ffe.replay.length, ffe.replay.delay);
  80                 switch (ffe.type) {
  81                         case FF_CONSTANT:
  82                                 tprintf(", constant_ef={%" PRIi16,
  83                                         ffe.u.constant.level);
  84                                 decode_envelope(&ffe.u.constant.envelope);
  85                                 tprints("}");
  86                                 return 1;
  87                         case FF_RAMP:
  88                                 tprintf(", ramp={start_level=%" PRIi16
  89                                         ", end_level=%" PRIi16,
  90                                         ffe.u.ramp.start_level,
  91                                         ffe.u.ramp.end_level);
  92                                 decode_envelope(&ffe.u.ramp.envelope);
  93                                 tprints("}");
  94                                 return 1;
  95                         case FF_PERIODIC:
  96                                 tprintf(", periodic_ef={waveform=%" PRIu16
  97                                         ", period=%" PRIu16
  98                                         ", magnitude=%" PRIi16
  99                                         ", offset=%" PRIi16
 100                                         ", phase=%" PRIu16,
 101                                         ffe.u.periodic.waveform,
 102                                         ffe.u.periodic.period,
 103                                         ffe.u.periodic.magnitude,
 104                                         ffe.u.periodic.offset,
 105                                         ffe.u.periodic.phase);
 106                                 decode_envelope(&ffe.u.periodic.envelope);
 107                                 tprintf(", custom_len=%" PRIu32
 108                                         ", *custom_data=%#lx}",
 109                                         ffe.u.periodic.custom_len,
 110                                         (unsigned long)ffe.u.periodic.custom_data);
 111                                 return 1;
 112                         case FF_RUMBLE:
 113                                 tprintf(", rumble={strong_magnitude=%" PRIu16
 114                                         ", weak_magnitude=%" PRIu16 "}",
 115                                         ffe.u.rumble.strong_magnitude,
 116                                         ffe.u.rumble.weak_magnitude);
 117                                 return 1;
 118                         case FF_SPRING:
 119                         case FF_FRICTION:
 120                         case FF_DAMPER:
 121                         case FF_INERTIA:
 122                         case FF_CUSTOM:
 123                                 break;
 124                         default :
 125                                 break;
 126                 }
 127         }
 128
 129         tprints(", ...}");
 130         return 1;
 131 }
 132
 133 static int
 134 abs_ioctl(struct tcb *tcp, long arg)
 135 {
 136         struct input_absinfo absinfo;
 137
 138         if (!verbose(tcp) || umove(tcp, arg, &absinfo) < 0)
 139                 return 0;
 140
 141         tprintf(", {value=%" PRIu32 ", minimum=%" PRIu32,
 142                 absinfo.value, absinfo.minimum);
 143         if (!abbrev(tcp)) {
 144                 tprintf(", maximum=%" PRIu32 ", fuzz=%" PRIu32,
 145                         absinfo.maximum, absinfo.fuzz);
 146                 tprintf(", flat=%" PRIu32, absinfo.flat);
 147 #ifdef HAVE_STRUCT_INPUT_ABSINFO_RESOLUTION
 148                 tprintf(", resolution=%" PRIu32, absinfo.resolution);
 149 #endif
 150                 tprints("}");
 151         } else {
 152                 tprints(", ...}");
 153         }
 154         return 1;
 155 }
 156
 157 static int
 158 keycode_ioctl(struct tcb *tcp, long arg)
 159 {
 160         unsigned int keycode[2];
 161
 162         if (!arg) {
 163                 tprints(", NULL");
 164                 return 1;
 165         }
 166
 167         if (!verbose(tcp) || umove(tcp, arg, &keycode) < 0)
 168                 return 0;
 169
 170         tprintf(", [%u, ", keycode[0]);
 171         printxval(evdev_keycode, keycode[1], "KEY_???");
 172         tprints("]");
 173         return 1;
 174 }
 175
 176 #ifdef EVIOCGKEYCODE_V2
 177 static int
 178 keycode_V2_ioctl(struct tcb *tcp, long arg)
 179 {
 180         struct input_keymap_entry ike;
 181
 182         if (!arg) {
 183                 tprints(", NULL");
 184                 return 1;
 185         }
 186
 187         if (!verbose(tcp) || umove(tcp, arg, &ike) < 0)
 188                 return 0;
 189
 190         tprintf(", {flags=%" PRIu8 ", len=%" PRIu8, ike.flags, ike.len);
 191         if (!abbrev(tcp)) {
 192                 unsigned int i;
 193
 194                 tprintf(", index=%" PRIu16 ", keycode=", ike.index);
 195                 printxval(evdev_keycode, ike.keycode, "KEY_???");
 196                 tprints(", scancode=[");
 197                 for (i = 0; i < ARRAY_SIZE(ike.scancode); i++) {
 198                         if (i > 0)
 199                                 tprints(", ");
 200                         tprintf("%" PRIx8, ike.scancode[i]);
 201                 }
 202                 tprints("]}");
 203         } else {
 204                 tprints(", ...}");
 205         }
 206         return 1;
 207 }
 208 #endif /* EVIOCGKEYCODE_V2 */
 209
 210 static int
 211 getid_ioctl(struct tcb *tcp, long arg)
 212 {
 213         struct input_id id;
 214
 215         if (!verbose(tcp) || umove(tcp, arg, &id) < 0)
 216                 return 0;
 217
 218         tprintf(", {ID_BUS=%" PRIu16 ", ID_VENDOR=%" PRIu16,
 219                 id.bustype, id.vendor);
 220         if (!abbrev(tcp)) {
 221                 tprintf(", ID_PRODUCT=%" PRIu16 ", ID_VERSION=%" PRIu16 "}",
 222                         id.product, id.version);
 223         } else {
 224                 tprints(", ...}");
 225         }
 226         return 1;
 227 }
 228
 229 static int
 230 decode_bitset(struct tcb *tcp, long arg, const struct xlat decode_nr[],
 231               const unsigned int max_nr, const char *dflt)
 232 {
 233         if (!verbose(tcp))
 234                 return 0;
 235
 236         unsigned int size;
 237         if ((unsigned long) tcp->u_rval > max_nr)
 238                 size = max_nr;
 239         else
 240                 size = tcp->u_rval;
 241         char decoded_arg[size];
 242
 243         if (umoven(tcp, arg, size, decoded_arg) < 0)
 244                 return 0;
 245
 246         tprints(", [");
 247
 248         int bit_displayed = 0;
 249         int i = next_set_bit(decoded_arg, 0, size);
 250         if (i < 0) {
 251                 tprints(" 0 ");
 252         } else {
 253                 printxval(decode_nr, i, dflt);
 254
 255                 while ((i = next_set_bit(decoded_arg, i + 1, size)) > 0) {
 256                         if (abbrev(tcp) && bit_displayed >= 3) {
 257                                 tprints(", ...");
 258                                 break;
 259                         }
 260                         tprints(", ");
 261                         printxval(decode_nr, i, dflt);
 262                         bit_displayed++;
 263                 }
 264         }
 265
 266         tprints("]");
 267
 268         return 1;
 269 }
 270
 271 #ifdef EVIOCGMTSLOTS
 272 static int
 273 mtslots_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 274 {
 275         const size_t size = _IOC_SIZE(code) / sizeof(int32_t);
 276         if (!size)
 277                 return 0;
 278
 279         int32_t buffer[size];
 280
 281         if (!verbose(tcp) || umove(tcp, arg, &buffer) < 0)
 282                 return 0;
 283
 284         tprints(", {code=");
 285         printxval(evdev_mtslots, buffer[0], "ABS_MT_???");
 286
 287         unsigned int i;
 288         tprints(", values=[");
 289
 290         for (i = 1; i < ARRAY_SIZE(buffer); i++)
 291                 tprintf("%s%d", i > 1 ? ", " : "", buffer[i]);
 292
 293         tprints("]}");
 294         return 1;
 295 }
 296 #endif /* EVIOCGMTSLOTS */
 297
 298 #ifdef EVIOCGREP
 299 static int
 300 repeat_ioctl(struct tcb *tcp, long arg)
 301 {
 302         unsigned int val[2];
 303
 304         if (!verbose(tcp) || umove(tcp, arg, &val) < 0)
 305                 return 0;
 306
 307         tprintf(", [%" PRIu32 " %" PRIu32 "]", val[0], val[1]);
 308         return 1;
 309 }
 310 #endif /* EVIOCGREP */
 311
 312 static int
 313 evdev_read_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 314 {
 315         if (entering(tcp))
 316                 return 1;
 317
 318         if (syserror(tcp))
 319                 return 0;
 320
 321         if ((_IOC_NR(code) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) {
 322                 switch (_IOC_NR(code) - 0x20) {
 323                         case EV_SYN:
 324                                 return decode_bitset(tcp, arg, evdev_sync,
 325                                                 SYN_MAX, "SYN_???");
 326                         case EV_KEY:
 327                                 return decode_bitset(tcp, arg, evdev_keycode,
 328                                                 KEY_MAX, "KEY_???");
 329                         case EV_REL:
 330                                 return decode_bitset(tcp, arg, evdev_relative_axes,
 331                                                 REL_MAX, "REL_???");
 332                         case EV_ABS:
 333                                 return decode_bitset(tcp, arg,
 334                                                 evdev_abs, ABS_MAX, "ABS_???");
 335                         case EV_MSC:
 336                                 return decode_bitset(tcp, arg,
 337                                                 evdev_misc, MSC_MAX, "MSC_???");
 338 #ifdef EV_SW
 339                         case EV_SW:
 340                                 return decode_bitset(tcp, arg,
 341                                                 evdev_switch, SW_MAX, "SW_???");
 342 #endif
 343                         case EV_LED:
 344                                 return decode_bitset(tcp, arg,
 345                                                 evdev_leds, LED_MAX, "LED_???");
 346                         case EV_SND:
 347                                 return decode_bitset(tcp, arg,
 348                                                 evdev_snd, SND_MAX, "SND_???");
 349                         case EV_REP:
 350                                 return decode_bitset(tcp, arg, evdev_autorepeat,
 351                                                 REP_MAX, "REP_???");
 352                         case EV_FF:
 353                                 return decode_bitset(tcp, arg, evdev_ff_types,
 354                                                 FF_MAX, "FF_???");
 355                         case EV_PWR:
 356                                 printnum_int(tcp, arg, "%d");
 357                                 return 1;
 358                         case EV_FF_STATUS:
 359                                 return decode_bitset(tcp, arg, evdev_ff_status,
 360                                                 FF_STATUS_MAX, "FF_STATUS_???");
 361                         default:
 362                                 return 0;
 363                 }
 364         }
 365
 366         if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0)))
 367                 return abs_ioctl(tcp, arg);
 368
 369         switch (code) {
 370                 case EVIOCGVERSION:
 371                         tprints(", ");
 372                         printnum_int(tcp, arg, "%" PRIx32);
 373                         return 1;
 374                 case EVIOCGEFFECTS:
 375                         tprints(", ");
 376                         printnum_int(tcp, arg, "%" PRIu32);
 377                         return 1;
 378                 case EVIOCGID:
 379                         return getid_ioctl(tcp, arg);
 380 #ifdef EVIOCGREP
 381                 case EVIOCGREP:
 382                         return repeat_ioctl(tcp, arg);;
 383 #endif
 384                 case EVIOCGKEYCODE:
 385                         return keycode_ioctl(tcp, arg);
 386 #ifdef EVIOCGKEYCODE_V2
 387                 case EVIOCGKEYCODE_V2:
 388                         return keycode_V2_ioctl(tcp, arg);
 389 #endif
 390         }
 391
 392         switch (_IOC_NR(code)) {
 393 #ifdef EVIOCGMTSLOTS
 394                 case _IOC_NR(EVIOCGMTSLOTS(0)):
 395                         return mtslots_ioctl(tcp, code, arg);
 396 #endif
 397                 case _IOC_NR(EVIOCGNAME(0)):
 398                 case _IOC_NR(EVIOCGPHYS(0)):
 399                 case _IOC_NR(EVIOCGUNIQ(0)):
 400                         tprints(", ");
 401                         printstr(tcp, arg, tcp->u_rval - 1);
 402                         return 1;
 403 #ifdef EVIOCGPROP
 404                 case _IOC_NR(EVIOCGPROP(0)):
 405                         return decode_bitset(tcp, arg,
 406                                         evdev_prop, INPUT_PROP_MAX, "PROP_???");
 407 #endif
 408                 case _IOC_NR(EVIOCGSND(0)):
 409                         return decode_bitset(tcp, arg,
 410                                         evdev_snd, SND_MAX, "SND_???");
 411 #ifdef EVIOCGSW
 412                 case _IOC_NR(EVIOCGSW(0)):
 413                         return decode_bitset(tcp, arg,
 414                                         evdev_switch, SW_MAX, "SW_???");
 415 #endif
 416                 case _IOC_NR(EVIOCGKEY(0)):
 417                         return decode_bitset(tcp, arg,
 418                                         evdev_keycode, KEY_MAX, "KEY_???");
 419                 case _IOC_NR(EVIOCGLED(0)):
 420                         return decode_bitset(tcp, arg,
 421                                         evdev_leds, LED_MAX, "LED_???");
 422                 default:
 423                         return 0;
 424         }
 425 }
 426
 427 static int
 428 evdev_write_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 429 {
 430         if (exiting(tcp))
 431                 return 1;
 432
 433         if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0)))
 434                 return abs_ioctl(tcp, arg);
 435
 436         switch (code) {
 437 #ifdef EVIOCSREP
 438                 case EVIOCSREP:
 439                         return repeat_ioctl(tcp, arg);
 440 #endif
 441                 case EVIOCSKEYCODE:
 442                         return keycode_ioctl(tcp, arg);
 443 #ifdef EVIOCSKEYCODE_V2
 444                 case EVIOCSKEYCODE_V2:
 445                         return keycode_V2_ioctl(tcp, arg);
 446 #endif
 447                 case EVIOCSFF:
 448                         return ff_effect_ioctl(tcp, arg);
 449                 case EVIOCRMFF:
 450 #ifdef EVIOCSCLOCKID
 451                 case EVIOCSCLOCKID:
 452 #endif
 453                 case EVIOCGRAB:
 454 #ifdef EVIOCREVOKE
 455                 case EVIOCREVOKE:
 456 #endif
 457                         tprints(", ");
 458                         printnum_int(tcp, arg, "%u");
 459                         return 1;
 460                 default:
 461                         return 0;
 462         }
 463 }
 464
 465 int
 466 evdev_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 467 {
 468         switch(_IOC_DIR(code)) {
 469                 case _IOC_READ:
 470                         return evdev_read_ioctl(tcp, code, arg);
 471                 case _IOC_WRITE:
 472                         if (!evdev_write_ioctl(tcp, code, arg))
 473                                 tprintf(", %lx", arg);
 474                         return 1;
 475                 default:
 476                         return 0;
 477         }
 478 }
 479
 480 #endif /* HAVE_LINUX_INPUT_H */