]> granicus.if.org Git - strace/blob - ioctl.c
strace.1: s/regex expression/regular expression/
[strace] / ioctl.c
1 /*
2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5  * Copyright (c) 1996-2001 Wichert Akkerman <wichert@cistron.nl>
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  * 3. The name of the author may not be used to endorse or promote products
17  *    derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30
31 #include "defs.h"
32 #include <linux/ioctl.h>
33 #include "xlat/ioctl_dirs.h"
34
35 #ifdef HAVE_LINUX_INPUT_H
36 # include <linux/input.h>
37 #endif
38
39 #include "xlat/evdev_abs.h"
40 #include "xlat/evdev_ev.h"
41
42 static int
43 compare(const void *a, const void *b)
44 {
45         const unsigned int code1 = (const uintptr_t) a;
46         const unsigned int code2 = ((struct_ioctlent *) b)->code;
47         return (code1 > code2) ? 1 : (code1 < code2) ? -1 : 0;
48 }
49
50 static const struct_ioctlent *
51 ioctl_lookup(const unsigned int code)
52 {
53         struct_ioctlent *iop;
54
55         iop = bsearch((const void *) (const uintptr_t) code, ioctlent,
56                         nioctlents, sizeof(ioctlent[0]), compare);
57         while (iop > ioctlent) {
58                 iop--;
59                 if (iop->code != code) {
60                         iop++;
61                         break;
62                 }
63         }
64         return iop;
65 }
66
67 static const struct_ioctlent *
68 ioctl_next_match(const struct_ioctlent *iop)
69 {
70         const unsigned int code = iop->code;
71         iop++;
72         if (iop < ioctlent + nioctlents && iop->code == code)
73                 return iop;
74         return NULL;
75 }
76
77 static void
78 ioctl_print_code(const unsigned int code)
79 {
80         tprints("_IOC(");
81         printflags(ioctl_dirs, _IOC_DIR(code), "_IOC_???");
82         tprintf(", %#x, %#x, %#x)",
83                 _IOC_TYPE(code), _IOC_NR(code), _IOC_SIZE(code));
84 }
85
86 static int
87 evdev_decode_number(const unsigned int code)
88 {
89         const unsigned int nr = _IOC_NR(code);
90
91         if (_IOC_DIR(code) == _IOC_WRITE) {
92                 if (nr >= 0xc0 && nr <= 0xc0 + 0x3f) {
93                         tprints("EVIOCSABS(");
94                         printxval(evdev_abs, nr - 0xc0, "ABS_???");
95                         tprints(")");
96                         return 1;
97                 }
98         }
99
100         if (_IOC_DIR(code) != _IOC_READ)
101                 return 0;
102
103         if (nr >= 0x20 && nr <= 0x20 + 0x1f) {
104                 tprints("EVIOCGBIT(");
105                 printxval(evdev_ev, nr - 0x20, "EV_???");
106                 tprintf(", %u)", _IOC_SIZE(code));
107                 return 1;
108         } else if (nr >= 0x40 && nr <= 0x40 + 0x3f) {
109                 tprints("EVIOCGABS(");
110                 printxval(evdev_abs, nr - 0x40, "ABS_???");
111                 tprints(")");
112                 return 1;
113         }
114
115         switch (_IOC_NR(nr)) {
116                 case 0x06:
117                         tprintf("EVIOCGNAME(%u)", _IOC_SIZE(code));
118                         return 1;
119                 case 0x07:
120                         tprintf("EVIOCGPHYS(%u)", _IOC_SIZE(code));
121                         return 1;
122                 case 0x08:
123                         tprintf("EVIOCGUNIQ(%u)", _IOC_SIZE(code));
124                         return 1;
125                 case 0x09:
126                         tprintf("EVIOCGPROP(%u)", _IOC_SIZE(code));
127                         return 1;
128                 case 0x0a:
129                         tprintf("EVIOCGMTSLOTS(%u)", _IOC_SIZE(code));
130                         return 1;
131                 case 0x18:
132                         tprintf("EVIOCGKEY(%u)", _IOC_SIZE(code));
133                         return 1;
134                 case 0x19:
135                         tprintf("EVIOCGLED(%u)", _IOC_SIZE(code));
136                         return 1;
137                 case 0x1a:
138                         tprintf("EVIOCGSND(%u)", _IOC_SIZE(code));
139                         return 1;
140                 case 0x1b:
141                         tprintf("EVIOCGSW(%u)", _IOC_SIZE(code));
142                         return 1;
143                 default:
144                         return 0;
145         }
146 }
147
148 static int
149 hiddev_decode_number(const unsigned int code)
150 {
151         if (_IOC_DIR(code) == _IOC_READ) {
152                 switch (_IOC_NR(code)) {
153                         case 0x04:
154                                 tprintf("HIDIOCGRAWNAME(%u)", _IOC_SIZE(code));
155                                 return 1;
156                         case 0x05:
157                                 tprintf("HIDIOCGRAWPHYS(%u)", _IOC_SIZE(code));
158                                 return 1;
159                         case 0x06:
160                                 tprintf("HIDIOCSFEATURE(%u)", _IOC_SIZE(code));
161                                 return 1;
162                         case 0x12:
163                                 tprintf("HIDIOCGPHYS(%u)", _IOC_SIZE(code));
164                                 return 1;
165                         default:
166                                 return 0;
167                 }
168         } else if (_IOC_DIR(code) == (_IOC_READ | _IOC_WRITE)) {
169                 switch (_IOC_NR(code)) {
170                         case 0x06:
171                                 tprintf("HIDIOCSFEATURE(%u)", _IOC_SIZE(code));
172                                 return 1;
173                         case 0x07:
174                                 tprintf("HIDIOCGFEATURE(%u)", _IOC_SIZE(code));
175                                 return 1;
176                         default:
177                                 return 0;
178                 }
179         }
180
181         return 0;
182 }
183
184 static int
185 ioctl_decode_command_number(struct tcb *tcp)
186 {
187         const unsigned int code = tcp->u_arg[1];
188
189         switch (_IOC_TYPE(code)) {
190                 case 'E':
191                         return evdev_decode_number(code);
192                 case 'H':
193                         return hiddev_decode_number(code);
194                 case 'M':
195                         if (_IOC_DIR(code) == _IOC_WRITE) {
196                                 tprintf("MIXER_WRITE(%u)", _IOC_NR(code));
197                                 return 1;
198                         } else if (_IOC_DIR(code) == _IOC_READ) {
199                                 tprintf("MIXER_READ(%u)", _IOC_NR(code));
200                                 return 1;
201                         }
202                         return 0;
203                 case 'U':
204                         if (_IOC_DIR(code) == _IOC_READ && _IOC_NR(code) == 0x2c) {
205                                 tprintf("UI_GET_SYSNAME(%u)", _IOC_SIZE(code));
206                                 return 1;
207                         }
208                         return 0;
209                 case 'j':
210                         if (_IOC_DIR(code) == _IOC_READ && _IOC_NR(code) == 0x13) {
211                                 tprintf("JSIOCGNAME(%u)", _IOC_SIZE(code));
212                                 return 1;
213                         }
214                         return 0;
215                 case 'k':
216                         if (_IOC_DIR(code) == _IOC_WRITE && _IOC_NR(code) == 0) {
217                                 tprintf("SPI_IOC_MESSAGE(%u)", _IOC_SIZE(code));
218                                 return 1;
219                         }
220                         return 0;
221                 default:
222                         return 0;
223         }
224 }
225
226 static int
227 ioctl_decode(struct tcb *tcp)
228 {
229         const unsigned int code = tcp->u_arg[1];
230         const kernel_ulong_t arg = tcp->u_arg[2];
231
232         switch (_IOC_TYPE(code)) {
233 #if defined(ALPHA) || defined(POWERPC)
234         case 'f': {
235                 int ret = file_ioctl(tcp, code, arg);
236                 if (ret != RVAL_DECODED)
237                         return ret;
238         }
239         case 't':
240         case 'T':
241                 return term_ioctl(tcp, code, arg);
242 #else /* !ALPHA */
243         case 'f':
244                 return file_ioctl(tcp, code, arg);
245         case 0x54:
246 #endif /* !ALPHA */
247                 return term_ioctl(tcp, code, arg);
248         case 0x89:
249                 return sock_ioctl(tcp, code, arg);
250         case 'p':
251                 return rtc_ioctl(tcp, code, arg);
252         case 0x03:
253                 return hdio_ioctl(tcp, code, arg);
254         case 0x12:
255                 return block_ioctl(tcp, code, arg);
256         case 'X':
257                 return fs_x_ioctl(tcp, code, arg);
258         case 0x22:
259                 return scsi_ioctl(tcp, code, arg);
260         case 'L':
261                 return loop_ioctl(tcp, code, arg);
262         case 'M':
263                 return mtd_ioctl(tcp, code, arg);
264         case 'o':
265         case 'O':
266                 return ubi_ioctl(tcp, code, arg);
267         case 'V':
268                 return v4l2_ioctl(tcp, code, arg);
269         case '=':
270                 return ptp_ioctl(tcp, code, arg);
271 #ifdef HAVE_LINUX_INPUT_H
272         case 'E':
273                 return evdev_ioctl(tcp, code, arg);
274 #endif
275 #ifdef HAVE_LINUX_USERFAULTFD_H
276         case 0xaa:
277                 return uffdio_ioctl(tcp, code, arg);
278 #endif
279 #ifdef HAVE_LINUX_BTRFS_H
280         case 0x94:
281                 return btrfs_ioctl(tcp, code, arg);
282 #endif
283         case 0xb7:
284                 return nsfs_ioctl(tcp, code, arg);
285 #ifdef HAVE_LINUX_DM_IOCTL_H
286         case 0xfd:
287                 return dm_ioctl(tcp, code, arg);
288 #endif
289         default:
290                 break;
291         }
292         return 0;
293 }
294
295 SYS_FUNC(ioctl)
296 {
297         const struct_ioctlent *iop;
298         int ret;
299
300         if (entering(tcp)) {
301                 printfd(tcp, tcp->u_arg[0]);
302                 tprints(", ");
303                 ret = ioctl_decode_command_number(tcp);
304                 if (!(ret & IOCTL_NUMBER_STOP_LOOKUP)) {
305                         iop = ioctl_lookup(tcp->u_arg[1]);
306                         if (iop) {
307                                 if (ret)
308                                         tprints(" or ");
309                                 tprints(iop->symbol);
310                                 while ((iop = ioctl_next_match(iop)))
311                                         tprintf(" or %s", iop->symbol);
312                         } else if (!ret) {
313                                 ioctl_print_code(tcp->u_arg[1]);
314                         }
315                 }
316                 ret = ioctl_decode(tcp);
317         } else {
318                 ret = ioctl_decode(tcp) | RVAL_DECODED;
319         }
320
321         if (ret & RVAL_DECODED) {
322                 ret &= ~RVAL_DECODED;
323                 if (ret)
324                         --ret;
325                 else
326                         tprintf(", %#" PRI_klx, tcp->u_arg[2]);
327                 ret |= RVAL_DECODED;
328         } else {
329                 if (ret)
330                         --ret;
331         }
332
333         return ret;
334 }