1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * mdev - Mini udev for busybox
|
---|
4 | *
|
---|
5 | * Copyright 2005 Rob Landley <rob@landley.net>
|
---|
6 | * Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
|
---|
7 | *
|
---|
8 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
---|
9 | */
|
---|
10 |
|
---|
11 | //config:config MDEV
|
---|
12 | //config: bool "mdev"
|
---|
13 | //config: default y
|
---|
14 | //config: select PLATFORM_LINUX
|
---|
15 | //config: help
|
---|
16 | //config: mdev is a mini-udev implementation for dynamically creating device
|
---|
17 | //config: nodes in the /dev directory.
|
---|
18 | //config:
|
---|
19 | //config: For more information, please see docs/mdev.txt
|
---|
20 | //config:
|
---|
21 | //config:config FEATURE_MDEV_CONF
|
---|
22 | //config: bool "Support /etc/mdev.conf"
|
---|
23 | //config: default y
|
---|
24 | //config: depends on MDEV
|
---|
25 | //config: help
|
---|
26 | //config: Add support for the mdev config file to control ownership and
|
---|
27 | //config: permissions of the device nodes.
|
---|
28 | //config:
|
---|
29 | //config: For more information, please see docs/mdev.txt
|
---|
30 | //config:
|
---|
31 | //config:config FEATURE_MDEV_RENAME
|
---|
32 | //config: bool "Support subdirs/symlinks"
|
---|
33 | //config: default y
|
---|
34 | //config: depends on FEATURE_MDEV_CONF
|
---|
35 | //config: help
|
---|
36 | //config: Add support for renaming devices and creating symlinks.
|
---|
37 | //config:
|
---|
38 | //config: For more information, please see docs/mdev.txt
|
---|
39 | //config:
|
---|
40 | //config:config FEATURE_MDEV_RENAME_REGEXP
|
---|
41 | //config: bool "Support regular expressions substitutions when renaming device"
|
---|
42 | //config: default y
|
---|
43 | //config: depends on FEATURE_MDEV_RENAME
|
---|
44 | //config: help
|
---|
45 | //config: Add support for regular expressions substitutions when renaming
|
---|
46 | //config: device.
|
---|
47 | //config:
|
---|
48 | //config:config FEATURE_MDEV_EXEC
|
---|
49 | //config: bool "Support command execution at device addition/removal"
|
---|
50 | //config: default y
|
---|
51 | //config: depends on FEATURE_MDEV_CONF
|
---|
52 | //config: help
|
---|
53 | //config: This adds support for an optional field to /etc/mdev.conf for
|
---|
54 | //config: executing commands when devices are created/removed.
|
---|
55 | //config:
|
---|
56 | //config: For more information, please see docs/mdev.txt
|
---|
57 | //config:
|
---|
58 | //config:config FEATURE_MDEV_LOAD_FIRMWARE
|
---|
59 | //config: bool "Support loading of firmwares"
|
---|
60 | //config: default y
|
---|
61 | //config: depends on MDEV
|
---|
62 | //config: help
|
---|
63 | //config: Some devices need to load firmware before they can be usable.
|
---|
64 | //config:
|
---|
65 | //config: These devices will request userspace look up the files in
|
---|
66 | //config: /lib/firmware/ and if it exists, send it to the kernel for
|
---|
67 | //config: loading into the hardware.
|
---|
68 |
|
---|
69 | //applet:IF_MDEV(APPLET(mdev, BB_DIR_SBIN, BB_SUID_DROP))
|
---|
70 |
|
---|
71 | //kbuild:lib-$(CONFIG_MDEV) += mdev.o
|
---|
72 |
|
---|
73 | //usage:#define mdev_trivial_usage
|
---|
74 | //usage: "[-s]"
|
---|
75 | //usage:#define mdev_full_usage "\n\n"
|
---|
76 | //usage: "mdev -s is to be run during boot to scan /sys and populate /dev.\n"
|
---|
77 | //usage: "\n"
|
---|
78 | //usage: "Bare mdev is a kernel hotplug helper. To activate it:\n"
|
---|
79 | //usage: " echo /sbin/mdev >/proc/sys/kernel/hotplug\n"
|
---|
80 | //usage: IF_FEATURE_MDEV_CONF(
|
---|
81 | //usage: "\n"
|
---|
82 | //usage: "It uses /etc/mdev.conf with lines\n"
|
---|
83 | //usage: " [-][ENV=regex;]...DEVNAME UID:GID PERM"
|
---|
84 | //usage: IF_FEATURE_MDEV_RENAME(" [>|=PATH]|[!]")
|
---|
85 | //usage: IF_FEATURE_MDEV_EXEC(" [@|$|*PROG]")
|
---|
86 | //usage: "\n"
|
---|
87 | //usage: "where DEVNAME is device name regex, @major,minor[-minor2], or\n"
|
---|
88 | //usage: "environment variable regex. A common use of the latter is\n"
|
---|
89 | //usage: "to load modules for hotplugged devices:\n"
|
---|
90 | //usage: " $MODALIAS=.* 0:0 660 @modprobe \"$MODALIAS\"\n"
|
---|
91 | //usage: )
|
---|
92 | //usage: "\n"
|
---|
93 | //usage: "If /dev/mdev.seq file exists, mdev will wait for its value\n"
|
---|
94 | //usage: "to match $SEQNUM variable. This prevents plug/unplug races.\n"
|
---|
95 | //usage: "To activate this feature, create empty /dev/mdev.seq at boot.\n"
|
---|
96 | //usage: "\n"
|
---|
97 | //usage: "If /dev/mdev.log file exists, debug log will be appended to it."
|
---|
98 |
|
---|
99 | #include "libbb.h"
|
---|
100 | #include "xregex.h"
|
---|
101 |
|
---|
102 | /* "mdev -s" scans /sys/class/xxx, looking for directories which have dev
|
---|
103 | * file (it is of the form "M:m\n"). Example: /sys/class/tty/tty0/dev
|
---|
104 | * contains "4:0\n". Directory name is taken as device name, path component
|
---|
105 | * directly after /sys/class/ as subsystem. In this example, "tty0" and "tty".
|
---|
106 | * Then mdev creates the /dev/device_name node.
|
---|
107 | * If /sys/class/.../dev file does not exist, mdev still may act
|
---|
108 | * on this device: see "@|$|*command args..." parameter in config file.
|
---|
109 | *
|
---|
110 | * mdev w/o parameters is called as hotplug helper. It takes device
|
---|
111 | * and subsystem names from $DEVPATH and $SUBSYSTEM, extracts
|
---|
112 | * maj,min from "/sys/$DEVPATH/dev" and also examines
|
---|
113 | * $ACTION ("add"/"delete") and $FIRMWARE.
|
---|
114 | *
|
---|
115 | * If action is "add", mdev creates /dev/device_name similarly to mdev -s.
|
---|
116 | * (todo: explain "delete" and $FIRMWARE)
|
---|
117 | *
|
---|
118 | * If /etc/mdev.conf exists, it may modify /dev/device_name's properties.
|
---|
119 | *
|
---|
120 | * Leading minus in 1st field means "don't stop on this line", otherwise
|
---|
121 | * search is stopped after the matching line is encountered.
|
---|
122 | *
|
---|
123 | * $envvar=regex format is useful for loading modules for hot-plugged devices
|
---|
124 | * which do not have driver loaded yet. In this case /sys/class/.../dev
|
---|
125 | * does not exist, but $MODALIAS is set to needed module's name
|
---|
126 | * (actually, an alias to it) by kernel. This rule instructs mdev
|
---|
127 | * to load the module and exit:
|
---|
128 | * $MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"
|
---|
129 | * The kernel will generate another hotplug event when /sys/class/.../dev
|
---|
130 | * file appears.
|
---|
131 | *
|
---|
132 | * When line matches, the device node is created, chmod'ed and chown'ed,
|
---|
133 | * moved to path, and if >path, a symlink to moved node is created,
|
---|
134 | * all this if /sys/class/.../dev exists.
|
---|
135 | * Examples:
|
---|
136 | * =loop/ - moves to /dev/loop
|
---|
137 | * >disk/sda%1 - moves to /dev/disk/sdaN, makes /dev/sdaN a symlink
|
---|
138 | *
|
---|
139 | * Then "command args..." is executed (via sh -c 'command args...').
|
---|
140 | * @:execute on creation, $:on deletion, *:on both.
|
---|
141 | * This happens regardless of /sys/class/.../dev existence.
|
---|
142 | */
|
---|
143 |
|
---|
144 | /* Kernel's hotplug environment constantly changes.
|
---|
145 | * Here are new cases I observed on 3.1.0:
|
---|
146 | *
|
---|
147 | * Case with $DEVNAME and $DEVICE, not just $DEVPATH:
|
---|
148 | * ACTION=add
|
---|
149 | * BUSNUM=001
|
---|
150 | * DEVICE=/proc/bus/usb/001/003
|
---|
151 | * DEVNAME=bus/usb/001/003
|
---|
152 | * DEVNUM=003
|
---|
153 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5
|
---|
154 | * DEVTYPE=usb_device
|
---|
155 | * MAJOR=189
|
---|
156 | * MINOR=2
|
---|
157 | * PRODUCT=18d1/4e12/227
|
---|
158 | * SUBSYSTEM=usb
|
---|
159 | * TYPE=0/0/0
|
---|
160 | *
|
---|
161 | * Case with $DEVICE, but no $DEVNAME - apparenty, usb iface notification?
|
---|
162 | * "Please load me a module" thing?
|
---|
163 | * ACTION=add
|
---|
164 | * DEVICE=/proc/bus/usb/001/003
|
---|
165 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0
|
---|
166 | * DEVTYPE=usb_interface
|
---|
167 | * INTERFACE=8/6/80
|
---|
168 | * MODALIAS=usb:v18D1p4E12d0227dc00dsc00dp00ic08isc06ip50
|
---|
169 | * PRODUCT=18d1/4e12/227
|
---|
170 | * SUBSYSTEM=usb
|
---|
171 | * TYPE=0/0/0
|
---|
172 | *
|
---|
173 | * ACTION=add
|
---|
174 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5
|
---|
175 | * DEVTYPE=scsi_host
|
---|
176 | * SUBSYSTEM=scsi
|
---|
177 | *
|
---|
178 | * ACTION=add
|
---|
179 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/scsi_host/host5
|
---|
180 | * SUBSYSTEM=scsi_host
|
---|
181 | *
|
---|
182 | * ACTION=add
|
---|
183 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0
|
---|
184 | * DEVTYPE=scsi_target
|
---|
185 | * SUBSYSTEM=scsi
|
---|
186 | *
|
---|
187 | * Case with strange $MODALIAS:
|
---|
188 | * ACTION=add
|
---|
189 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0
|
---|
190 | * DEVTYPE=scsi_device
|
---|
191 | * MODALIAS=scsi:t-0x00
|
---|
192 | * SUBSYSTEM=scsi
|
---|
193 | *
|
---|
194 | * ACTION=add
|
---|
195 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0/scsi_disk/5:0:0:0
|
---|
196 | * SUBSYSTEM=scsi_disk
|
---|
197 | *
|
---|
198 | * ACTION=add
|
---|
199 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0/scsi_device/5:0:0:0
|
---|
200 | * SUBSYSTEM=scsi_device
|
---|
201 | *
|
---|
202 | * Case with explicit $MAJOR/$MINOR (no need to read /sys/$DEVPATH/dev?):
|
---|
203 | * ACTION=add
|
---|
204 | * DEVNAME=bsg/5:0:0:0
|
---|
205 | * DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0/bsg/5:0:0:0
|
---|
206 | * MAJOR=253
|
---|
207 | * MINOR=1
|
---|
208 | * SUBSYSTEM=bsg
|
---|
209 | *
|
---|
210 | * ACTION=add
|
---|
211 | * DEVPATH=/devices/virtual/bdi/8:16
|
---|
212 | * SUBSYSTEM=bdi
|
---|
213 | *
|
---|
214 | * ACTION=add
|
---|
215 | * DEVNAME=sdb
|
---|
216 | * DEVPATH=/block/sdb
|
---|
217 | * DEVTYPE=disk
|
---|
218 | * MAJOR=8
|
---|
219 | * MINOR=16
|
---|
220 | * SUBSYSTEM=block
|
---|
221 | *
|
---|
222 | * Case with ACTION=change:
|
---|
223 | * ACTION=change
|
---|
224 | * DEVNAME=sdb
|
---|
225 | * DEVPATH=/block/sdb
|
---|
226 | * DEVTYPE=disk
|
---|
227 | * DISK_MEDIA_CHANGE=1
|
---|
228 | * MAJOR=8
|
---|
229 | * MINOR=16
|
---|
230 | * SUBSYSTEM=block
|
---|
231 | */
|
---|
232 |
|
---|
233 | #define DEBUG_LVL 2
|
---|
234 |
|
---|
235 | #if DEBUG_LVL >= 1
|
---|
236 | # define dbg1(...) do { if (G.verbose) bb_error_msg(__VA_ARGS__); } while(0)
|
---|
237 | #else
|
---|
238 | # define dbg1(...) ((void)0)
|
---|
239 | #endif
|
---|
240 | #if DEBUG_LVL >= 2
|
---|
241 | # define dbg2(...) do { if (G.verbose >= 2) bb_error_msg(__VA_ARGS__); } while(0)
|
---|
242 | #else
|
---|
243 | # define dbg2(...) ((void)0)
|
---|
244 | #endif
|
---|
245 | #if DEBUG_LVL >= 3
|
---|
246 | # define dbg3(...) do { if (G.verbose >= 3) bb_error_msg(__VA_ARGS__); } while(0)
|
---|
247 | #else
|
---|
248 | # define dbg3(...) ((void)0)
|
---|
249 | #endif
|
---|
250 |
|
---|
251 |
|
---|
252 | static const char keywords[] ALIGN1 = "add\0remove\0"; // "change\0"
|
---|
253 | enum { OP_add, OP_remove };
|
---|
254 |
|
---|
255 | struct envmatch {
|
---|
256 | struct envmatch *next;
|
---|
257 | char *envname;
|
---|
258 | regex_t match;
|
---|
259 | };
|
---|
260 |
|
---|
261 | struct rule {
|
---|
262 | bool keep_matching;
|
---|
263 | bool regex_compiled;
|
---|
264 | mode_t mode;
|
---|
265 | int maj, min0, min1;
|
---|
266 | struct bb_uidgid_t ugid;
|
---|
267 | char *envvar;
|
---|
268 | char *ren_mov;
|
---|
269 | IF_FEATURE_MDEV_EXEC(char *r_cmd;)
|
---|
270 | regex_t match;
|
---|
271 | struct envmatch *envmatch;
|
---|
272 | };
|
---|
273 |
|
---|
274 | struct globals {
|
---|
275 | int root_major, root_minor;
|
---|
276 | smallint verbose;
|
---|
277 | char *subsystem;
|
---|
278 | char *subsys_env; /* for putenv("SUBSYSTEM=subsystem") */
|
---|
279 | #if ENABLE_FEATURE_MDEV_CONF
|
---|
280 | const char *filename;
|
---|
281 | parser_t *parser;
|
---|
282 | struct rule **rule_vec;
|
---|
283 | unsigned rule_idx;
|
---|
284 | #endif
|
---|
285 | struct rule cur_rule;
|
---|
286 | char timestr[sizeof("60.123456")];
|
---|
287 | } FIX_ALIASING;
|
---|
288 | #define G (*(struct globals*)&bb_common_bufsiz1)
|
---|
289 | #define INIT_G() do { \
|
---|
290 | IF_NOT_FEATURE_MDEV_CONF(G.cur_rule.maj = -1;) \
|
---|
291 | IF_NOT_FEATURE_MDEV_CONF(G.cur_rule.mode = 0660;) \
|
---|
292 | } while (0)
|
---|
293 |
|
---|
294 |
|
---|
295 | /* Prevent infinite loops in /sys symlinks */
|
---|
296 | #define MAX_SYSFS_DEPTH 3
|
---|
297 |
|
---|
298 | /* We use additional bytes in make_device() */
|
---|
299 | #define SCRATCH_SIZE 128
|
---|
300 |
|
---|
301 | #if ENABLE_FEATURE_MDEV_CONF
|
---|
302 |
|
---|
303 | static void make_default_cur_rule(void)
|
---|
304 | {
|
---|
305 | memset(&G.cur_rule, 0, sizeof(G.cur_rule));
|
---|
306 | G.cur_rule.maj = -1; /* "not a @major,minor rule" */
|
---|
307 | G.cur_rule.mode = 0660;
|
---|
308 | }
|
---|
309 |
|
---|
310 | static void clean_up_cur_rule(void)
|
---|
311 | {
|
---|
312 | struct envmatch *e;
|
---|
313 |
|
---|
314 | free(G.cur_rule.envvar);
|
---|
315 | free(G.cur_rule.ren_mov);
|
---|
316 | if (G.cur_rule.regex_compiled)
|
---|
317 | regfree(&G.cur_rule.match);
|
---|
318 | IF_FEATURE_MDEV_EXEC(free(G.cur_rule.r_cmd);)
|
---|
319 | e = G.cur_rule.envmatch;
|
---|
320 | while (e) {
|
---|
321 | free(e->envname);
|
---|
322 | regfree(&e->match);
|
---|
323 | e = e->next;
|
---|
324 | }
|
---|
325 | make_default_cur_rule();
|
---|
326 | }
|
---|
327 |
|
---|
328 | /* In later versions, endofname is in libbb */
|
---|
329 | #define endofname mdev_endofname
|
---|
330 | static
|
---|
331 | const char* FAST_FUNC
|
---|
332 | endofname(const char *name)
|
---|
333 | {
|
---|
334 | #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
|
---|
335 | #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
|
---|
336 | if (!is_name(*name))
|
---|
337 | return name;
|
---|
338 | while (*++name) {
|
---|
339 | if (!is_in_name(*name))
|
---|
340 | break;
|
---|
341 | }
|
---|
342 | return name;
|
---|
343 | }
|
---|
344 |
|
---|
345 | static char *parse_envmatch_pfx(char *val)
|
---|
346 | {
|
---|
347 | struct envmatch **nextp = &G.cur_rule.envmatch;
|
---|
348 |
|
---|
349 | for (;;) {
|
---|
350 | struct envmatch *e;
|
---|
351 | char *semicolon;
|
---|
352 | char *eq = strchr(val, '=');
|
---|
353 | if (!eq /* || eq == val? */)
|
---|
354 | return val;
|
---|
355 | if (endofname(val) != eq)
|
---|
356 | return val;
|
---|
357 | semicolon = strchr(eq, ';');
|
---|
358 | if (!semicolon)
|
---|
359 | return val;
|
---|
360 | /* ENVVAR=regex;... */
|
---|
361 | *nextp = e = xzalloc(sizeof(*e));
|
---|
362 | nextp = &e->next;
|
---|
363 | e->envname = xstrndup(val, eq - val);
|
---|
364 | *semicolon = '\0';
|
---|
365 | xregcomp(&e->match, eq + 1, REG_EXTENDED);
|
---|
366 | *semicolon = ';';
|
---|
367 | val = semicolon + 1;
|
---|
368 | }
|
---|
369 | }
|
---|
370 |
|
---|
371 | static void parse_next_rule(void)
|
---|
372 | {
|
---|
373 | /* Note: on entry, G.cur_rule is set to default */
|
---|
374 | while (1) {
|
---|
375 | char *tokens[4];
|
---|
376 | char *val;
|
---|
377 |
|
---|
378 | /* No PARSE_EOL_COMMENTS, because command may contain '#' chars */
|
---|
379 | if (!config_read(G.parser, tokens, 4, 3, "# \t", PARSE_NORMAL & ~PARSE_EOL_COMMENTS))
|
---|
380 | break;
|
---|
381 |
|
---|
382 | /* Fields: [-]regex uid:gid mode [alias] [cmd] */
|
---|
383 | dbg3("token1:'%s'", tokens[1]);
|
---|
384 |
|
---|
385 | /* 1st field */
|
---|
386 | val = tokens[0];
|
---|
387 | G.cur_rule.keep_matching = ('-' == val[0]);
|
---|
388 | val += G.cur_rule.keep_matching; /* swallow leading dash */
|
---|
389 | val = parse_envmatch_pfx(val);
|
---|
390 | if (val[0] == '@') {
|
---|
391 | /* @major,minor[-minor2] */
|
---|
392 | /* (useful when name is ambiguous:
|
---|
393 | * "/sys/class/usb/lp0" and
|
---|
394 | * "/sys/class/printer/lp0")
|
---|
395 | */
|
---|
396 | int sc = sscanf(val, "@%u,%u-%u", &G.cur_rule.maj, &G.cur_rule.min0, &G.cur_rule.min1);
|
---|
397 | if (sc < 2 || G.cur_rule.maj < 0) {
|
---|
398 | bb_error_msg("bad @maj,min on line %d", G.parser->lineno);
|
---|
399 | goto next_rule;
|
---|
400 | }
|
---|
401 | if (sc == 2)
|
---|
402 | G.cur_rule.min1 = G.cur_rule.min0;
|
---|
403 | } else {
|
---|
404 | char *eq = strchr(val, '=');
|
---|
405 | if (val[0] == '$') {
|
---|
406 | /* $ENVVAR=regex ... */
|
---|
407 | val++;
|
---|
408 | if (!eq) {
|
---|
409 | bb_error_msg("bad $envvar=regex on line %d", G.parser->lineno);
|
---|
410 | goto next_rule;
|
---|
411 | }
|
---|
412 | G.cur_rule.envvar = xstrndup(val, eq - val);
|
---|
413 | val = eq + 1;
|
---|
414 | }
|
---|
415 | xregcomp(&G.cur_rule.match, val, REG_EXTENDED);
|
---|
416 | G.cur_rule.regex_compiled = 1;
|
---|
417 | }
|
---|
418 |
|
---|
419 | /* 2nd field: uid:gid - device ownership */
|
---|
420 | if (get_uidgid(&G.cur_rule.ugid, tokens[1], /*allow_numeric:*/ 1) == 0) {
|
---|
421 | bb_error_msg("unknown user/group '%s' on line %d", tokens[1], G.parser->lineno);
|
---|
422 | goto next_rule;
|
---|
423 | }
|
---|
424 |
|
---|
425 | /* 3rd field: mode - device permissions */
|
---|
426 | bb_parse_mode(tokens[2], &G.cur_rule.mode);
|
---|
427 |
|
---|
428 | /* 4th field (opt): ">|=alias" or "!" to not create the node */
|
---|
429 | val = tokens[3];
|
---|
430 | if (ENABLE_FEATURE_MDEV_RENAME && val && strchr(">=!", val[0])) {
|
---|
431 | char *s = skip_non_whitespace(val);
|
---|
432 | G.cur_rule.ren_mov = xstrndup(val, s - val);
|
---|
433 | val = skip_whitespace(s);
|
---|
434 | }
|
---|
435 |
|
---|
436 | if (ENABLE_FEATURE_MDEV_EXEC && val && val[0]) {
|
---|
437 | const char *s = "$@*";
|
---|
438 | const char *s2 = strchr(s, val[0]);
|
---|
439 | if (!s2) {
|
---|
440 | bb_error_msg("bad line %u", G.parser->lineno);
|
---|
441 | goto next_rule;
|
---|
442 | }
|
---|
443 | IF_FEATURE_MDEV_EXEC(G.cur_rule.r_cmd = xstrdup(val);)
|
---|
444 | }
|
---|
445 |
|
---|
446 | return;
|
---|
447 | next_rule:
|
---|
448 | clean_up_cur_rule();
|
---|
449 | } /* while (config_read) */
|
---|
450 |
|
---|
451 | dbg3("config_close(G.parser)");
|
---|
452 | config_close(G.parser);
|
---|
453 | G.parser = NULL;
|
---|
454 |
|
---|
455 | return;
|
---|
456 | }
|
---|
457 |
|
---|
458 | /* If mdev -s, we remember rules in G.rule_vec[].
|
---|
459 | * Otherwise, there is no point in doing it, and we just
|
---|
460 | * save only one parsed rule in G.cur_rule.
|
---|
461 | */
|
---|
462 | static const struct rule *next_rule(void)
|
---|
463 | {
|
---|
464 | struct rule *rule;
|
---|
465 |
|
---|
466 | /* Open conf file if we didn't do it yet */
|
---|
467 | if (!G.parser && G.filename) {
|
---|
468 | dbg3("config_open('%s')", G.filename);
|
---|
469 | G.parser = config_open2(G.filename, fopen_for_read);
|
---|
470 | G.filename = NULL;
|
---|
471 | }
|
---|
472 |
|
---|
473 | if (G.rule_vec) {
|
---|
474 | /* mdev -s */
|
---|
475 | /* Do we have rule parsed already? */
|
---|
476 | if (G.rule_vec[G.rule_idx]) {
|
---|
477 | dbg3("< G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
|
---|
478 | return G.rule_vec[G.rule_idx++];
|
---|
479 | }
|
---|
480 | make_default_cur_rule();
|
---|
481 | } else {
|
---|
482 | /* not mdev -s */
|
---|
483 | clean_up_cur_rule();
|
---|
484 | }
|
---|
485 |
|
---|
486 | /* Parse one more rule if file isn't fully read */
|
---|
487 | rule = &G.cur_rule;
|
---|
488 | if (G.parser) {
|
---|
489 | parse_next_rule();
|
---|
490 | if (G.rule_vec) { /* mdev -s */
|
---|
491 | rule = memcpy(xmalloc(sizeof(G.cur_rule)), &G.cur_rule, sizeof(G.cur_rule));
|
---|
492 | G.rule_vec = xrealloc_vector(G.rule_vec, 4, G.rule_idx);
|
---|
493 | G.rule_vec[G.rule_idx++] = rule;
|
---|
494 | dbg3("> G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
|
---|
495 | }
|
---|
496 | }
|
---|
497 |
|
---|
498 | return rule;
|
---|
499 | }
|
---|
500 |
|
---|
501 | static int env_matches(struct envmatch *e)
|
---|
502 | {
|
---|
503 | while (e) {
|
---|
504 | int r;
|
---|
505 | char *val = getenv(e->envname);
|
---|
506 | if (!val)
|
---|
507 | return 0;
|
---|
508 | r = regexec(&e->match, val, /*size*/ 0, /*range[]*/ NULL, /*eflags*/ 0);
|
---|
509 | if (r != 0) /* no match */
|
---|
510 | return 0;
|
---|
511 | e = e->next;
|
---|
512 | }
|
---|
513 | return 1;
|
---|
514 | }
|
---|
515 |
|
---|
516 | #else
|
---|
517 |
|
---|
518 | # define next_rule() (&G.cur_rule)
|
---|
519 |
|
---|
520 | #endif
|
---|
521 |
|
---|
522 | static void mkdir_recursive(char *name)
|
---|
523 | {
|
---|
524 | /* if name has many levels ("dir1/dir2"),
|
---|
525 | * bb_make_directory() will create dir1 according to umask,
|
---|
526 | * not according to its "mode" parameter.
|
---|
527 | * Since we run with umask=0, need to temporarily switch it.
|
---|
528 | */
|
---|
529 | umask(022); /* "dir1" (if any) will be 0755 too */
|
---|
530 | bb_make_directory(name, 0755, FILEUTILS_RECUR);
|
---|
531 | umask(0);
|
---|
532 | }
|
---|
533 |
|
---|
534 | /* Builds an alias path.
|
---|
535 | * This function potentionally reallocates the alias parameter.
|
---|
536 | * Only used for ENABLE_FEATURE_MDEV_RENAME
|
---|
537 | */
|
---|
538 | static char *build_alias(char *alias, const char *device_name)
|
---|
539 | {
|
---|
540 | char *dest;
|
---|
541 |
|
---|
542 | /* ">bar/": rename to bar/device_name */
|
---|
543 | /* ">bar[/]baz": rename to bar[/]baz */
|
---|
544 | dest = strrchr(alias, '/');
|
---|
545 | if (dest) { /* ">bar/[baz]" ? */
|
---|
546 | *dest = '\0'; /* mkdir bar */
|
---|
547 | mkdir_recursive(alias);
|
---|
548 | *dest = '/';
|
---|
549 | if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
|
---|
550 | dest = alias;
|
---|
551 | alias = concat_path_file(alias, device_name);
|
---|
552 | free(dest);
|
---|
553 | }
|
---|
554 | }
|
---|
555 |
|
---|
556 | return alias;
|
---|
557 | }
|
---|
558 |
|
---|
559 | /* mknod in /dev based on a path like "/sys/block/hda/hda1"
|
---|
560 | * NB1: path parameter needs to have SCRATCH_SIZE scratch bytes
|
---|
561 | * after NUL, but we promise to not mangle (IOW: to restore NUL if needed)
|
---|
562 | * path string.
|
---|
563 | * NB2: "mdev -s" may call us many times, do not leak memory/fds!
|
---|
564 | *
|
---|
565 | * device_name = $DEVNAME (may be NULL)
|
---|
566 | * path = /sys/$DEVPATH
|
---|
567 | */
|
---|
568 | static void make_device(char *device_name, char *path, int operation)
|
---|
569 | {
|
---|
570 | int major, minor, type, len;
|
---|
571 | char *path_end = path + strlen(path);
|
---|
572 |
|
---|
573 | /* Try to read major/minor string. Note that the kernel puts \n after
|
---|
574 | * the data, so we don't need to worry about null terminating the string
|
---|
575 | * because sscanf() will stop at the first nondigit, which \n is.
|
---|
576 | * We also depend on path having writeable space after it.
|
---|
577 | */
|
---|
578 | major = -1;
|
---|
579 | if (operation == OP_add) {
|
---|
580 | strcpy(path_end, "/dev");
|
---|
581 | len = open_read_close(path, path_end + 1, SCRATCH_SIZE - 1);
|
---|
582 | *path_end = '\0';
|
---|
583 | if (len < 1) {
|
---|
584 | if (!ENABLE_FEATURE_MDEV_EXEC)
|
---|
585 | return;
|
---|
586 | /* no "dev" file, but we can still run scripts
|
---|
587 | * based on device name */
|
---|
588 | } else if (sscanf(path_end + 1, "%u:%u", &major, &minor) == 2) {
|
---|
589 | dbg1("dev %u,%u", major, minor);
|
---|
590 | } else {
|
---|
591 | major = -1;
|
---|
592 | }
|
---|
593 | }
|
---|
594 | /* else: for delete, -1 still deletes the node, but < -1 suppresses that */
|
---|
595 |
|
---|
596 | /* Determine device name */
|
---|
597 | if (!device_name) {
|
---|
598 | /*
|
---|
599 | * There was no $DEVNAME envvar (for example, mdev -s never has).
|
---|
600 | * But it is very useful: it contains the *path*, not only basename,
|
---|
601 | * Thankfully, uevent file has it.
|
---|
602 | * Example of .../sound/card0/controlC0/uevent file on Linux-3.7.7:
|
---|
603 | * MAJOR=116
|
---|
604 | * MINOR=7
|
---|
605 | * DEVNAME=snd/controlC0
|
---|
606 | */
|
---|
607 | strcpy(path_end, "/uevent");
|
---|
608 | len = open_read_close(path, path_end + 1, SCRATCH_SIZE - 1);
|
---|
609 | if (len < 0)
|
---|
610 | len = 0;
|
---|
611 | *path_end = '\0';
|
---|
612 | path_end[1 + len] = '\0';
|
---|
613 | device_name = strstr(path_end + 1, "\nDEVNAME=");
|
---|
614 | if (device_name) {
|
---|
615 | device_name += sizeof("\nDEVNAME=")-1;
|
---|
616 | strchrnul(device_name, '\n')[0] = '\0';
|
---|
617 | } else {
|
---|
618 | /* Fall back to just basename */
|
---|
619 | device_name = (char*) bb_basename(path);
|
---|
620 | }
|
---|
621 | }
|
---|
622 | /* Determine device type */
|
---|
623 | /*
|
---|
624 | * http://kernel.org/doc/pending/hotplug.txt says that only
|
---|
625 | * "/sys/block/..." is for block devices. "/sys/bus" etc is not.
|
---|
626 | * But since 2.6.25 block devices are also in /sys/class/block.
|
---|
627 | * We use strstr("/block/") to forestall future surprises.
|
---|
628 | */
|
---|
629 | type = S_IFCHR;
|
---|
630 | if (strstr(path, "/block/") || (G.subsystem && strncmp(G.subsystem, "block", 5) == 0))
|
---|
631 | type = S_IFBLK;
|
---|
632 |
|
---|
633 | #if ENABLE_FEATURE_MDEV_CONF
|
---|
634 | G.rule_idx = 0; /* restart from the beginning (think mdev -s) */
|
---|
635 | #endif
|
---|
636 | for (;;) {
|
---|
637 | const char *str_to_match;
|
---|
638 | regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
|
---|
639 | char *command;
|
---|
640 | char *alias;
|
---|
641 | char aliaslink = aliaslink; /* for compiler */
|
---|
642 | char *node_name;
|
---|
643 | const struct rule *rule;
|
---|
644 |
|
---|
645 | str_to_match = device_name;
|
---|
646 |
|
---|
647 | rule = next_rule();
|
---|
648 |
|
---|
649 | #if ENABLE_FEATURE_MDEV_CONF
|
---|
650 | if (!env_matches(rule->envmatch))
|
---|
651 | continue;
|
---|
652 | if (rule->maj >= 0) { /* @maj,min rule */
|
---|
653 | if (major != rule->maj)
|
---|
654 | continue;
|
---|
655 | if (minor < rule->min0 || minor > rule->min1)
|
---|
656 | continue;
|
---|
657 | memset(off, 0, sizeof(off));
|
---|
658 | goto rule_matches;
|
---|
659 | }
|
---|
660 | if (rule->envvar) { /* $envvar=regex rule */
|
---|
661 | str_to_match = getenv(rule->envvar);
|
---|
662 | dbg3("getenv('%s'):'%s'", rule->envvar, str_to_match);
|
---|
663 | if (!str_to_match)
|
---|
664 | continue;
|
---|
665 | }
|
---|
666 | /* else: str_to_match = device_name */
|
---|
667 |
|
---|
668 | if (rule->regex_compiled) {
|
---|
669 | int regex_match = regexec(&rule->match, str_to_match, ARRAY_SIZE(off), off, 0);
|
---|
670 | dbg3("regex_match for '%s':%d", str_to_match, regex_match);
|
---|
671 | //bb_error_msg("matches:");
|
---|
672 | //for (int i = 0; i < ARRAY_SIZE(off); i++) {
|
---|
673 | // if (off[i].rm_so < 0) continue;
|
---|
674 | // bb_error_msg("match %d: '%.*s'\n", i,
|
---|
675 | // (int)(off[i].rm_eo - off[i].rm_so),
|
---|
676 | // device_name + off[i].rm_so);
|
---|
677 | //}
|
---|
678 |
|
---|
679 | if (regex_match != 0
|
---|
680 | /* regexec returns whole pattern as "range" 0 */
|
---|
681 | || off[0].rm_so != 0
|
---|
682 | || (int)off[0].rm_eo != (int)strlen(str_to_match)
|
---|
683 | ) {
|
---|
684 | continue; /* this rule doesn't match */
|
---|
685 | }
|
---|
686 | }
|
---|
687 | /* else: it's final implicit "match-all" rule */
|
---|
688 | rule_matches:
|
---|
689 | dbg2("rule matched, line %d", G.parser ? G.parser->lineno : -1);
|
---|
690 | #endif
|
---|
691 | /* Build alias name */
|
---|
692 | alias = NULL;
|
---|
693 | if (ENABLE_FEATURE_MDEV_RENAME && rule->ren_mov) {
|
---|
694 | aliaslink = rule->ren_mov[0];
|
---|
695 | if (aliaslink == '!') {
|
---|
696 | /* "!": suppress node creation/deletion */
|
---|
697 | major = -2;
|
---|
698 | }
|
---|
699 | else if (aliaslink == '>' || aliaslink == '=') {
|
---|
700 | if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
|
---|
701 | char *s;
|
---|
702 | char *p;
|
---|
703 | unsigned n;
|
---|
704 |
|
---|
705 | /* substitute %1..9 with off[1..9], if any */
|
---|
706 | n = 0;
|
---|
707 | s = rule->ren_mov;
|
---|
708 | while (*s)
|
---|
709 | if (*s++ == '%')
|
---|
710 | n++;
|
---|
711 |
|
---|
712 | p = alias = xzalloc(strlen(rule->ren_mov) + n * strlen(str_to_match));
|
---|
713 | s = rule->ren_mov + 1;
|
---|
714 | while (*s) {
|
---|
715 | *p = *s;
|
---|
716 | if ('%' == *s) {
|
---|
717 | unsigned i = (s[1] - '0');
|
---|
718 | if (i <= 9 && off[i].rm_so >= 0) {
|
---|
719 | n = off[i].rm_eo - off[i].rm_so;
|
---|
720 | strncpy(p, str_to_match + off[i].rm_so, n);
|
---|
721 | p += n - 1;
|
---|
722 | s++;
|
---|
723 | }
|
---|
724 | }
|
---|
725 | p++;
|
---|
726 | s++;
|
---|
727 | }
|
---|
728 | } else {
|
---|
729 | alias = xstrdup(rule->ren_mov + 1);
|
---|
730 | }
|
---|
731 | }
|
---|
732 | }
|
---|
733 | dbg3("alias:'%s'", alias);
|
---|
734 |
|
---|
735 | command = NULL;
|
---|
736 | IF_FEATURE_MDEV_EXEC(command = rule->r_cmd;)
|
---|
737 | if (command) {
|
---|
738 | /* Are we running this command now?
|
---|
739 | * Run @cmd on create, $cmd on delete, *cmd on any
|
---|
740 | */
|
---|
741 | if ((command[0] == '@' && operation == OP_add)
|
---|
742 | || (command[0] == '$' && operation == OP_remove)
|
---|
743 | || (command[0] == '*')
|
---|
744 | ) {
|
---|
745 | command++;
|
---|
746 | } else {
|
---|
747 | command = NULL;
|
---|
748 | }
|
---|
749 | }
|
---|
750 | dbg3("command:'%s'", command);
|
---|
751 |
|
---|
752 | /* "Execute" the line we found */
|
---|
753 | node_name = device_name;
|
---|
754 | if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
---|
755 | node_name = alias = build_alias(alias, device_name);
|
---|
756 | dbg3("alias2:'%s'", alias);
|
---|
757 | }
|
---|
758 |
|
---|
759 | if (operation == OP_add && major >= 0) {
|
---|
760 | char *slash = strrchr(node_name, '/');
|
---|
761 | if (slash) {
|
---|
762 | *slash = '\0';
|
---|
763 | mkdir_recursive(node_name);
|
---|
764 | *slash = '/';
|
---|
765 | }
|
---|
766 | if (ENABLE_FEATURE_MDEV_CONF) {
|
---|
767 | dbg1("mknod %s (%d,%d) %o"
|
---|
768 | " %u:%u",
|
---|
769 | node_name, major, minor, rule->mode | type,
|
---|
770 | rule->ugid.uid, rule->ugid.gid
|
---|
771 | );
|
---|
772 | } else {
|
---|
773 | dbg1("mknod %s (%d,%d) %o",
|
---|
774 | node_name, major, minor, rule->mode | type
|
---|
775 | );
|
---|
776 | }
|
---|
777 | if (mknod(node_name, rule->mode | type, makedev(major, minor)) && errno != EEXIST)
|
---|
778 | bb_perror_msg("can't create '%s'", node_name);
|
---|
779 | if (ENABLE_FEATURE_MDEV_CONF) {
|
---|
780 | chmod(node_name, rule->mode);
|
---|
781 | chown(node_name, rule->ugid.uid, rule->ugid.gid);
|
---|
782 | }
|
---|
783 | if (major == G.root_major && minor == G.root_minor)
|
---|
784 | symlink(node_name, "root");
|
---|
785 | if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
---|
786 | if (aliaslink == '>') {
|
---|
787 | //TODO: on devtmpfs, device_name already exists and symlink() fails.
|
---|
788 | //End result is that instead of symlink, we have two nodes.
|
---|
789 | //What should be done?
|
---|
790 | dbg1("symlink: %s", device_name);
|
---|
791 | symlink(node_name, device_name);
|
---|
792 | }
|
---|
793 | }
|
---|
794 | }
|
---|
795 |
|
---|
796 | if (ENABLE_FEATURE_MDEV_EXEC && command) {
|
---|
797 | /* setenv will leak memory, use putenv/unsetenv/free */
|
---|
798 | char *s = xasprintf("%s=%s", "MDEV", node_name);
|
---|
799 | putenv(s);
|
---|
800 | dbg1("running: %s", command);
|
---|
801 | if (system(command) == -1)
|
---|
802 | bb_perror_msg("can't run '%s'", command);
|
---|
803 | bb_unsetenv_and_free(s);
|
---|
804 | }
|
---|
805 |
|
---|
806 | if (operation == OP_remove && major >= -1) {
|
---|
807 | if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
---|
808 | if (aliaslink == '>') {
|
---|
809 | dbg1("unlink: %s", device_name);
|
---|
810 | unlink(device_name);
|
---|
811 | }
|
---|
812 | }
|
---|
813 | dbg1("unlink: %s", node_name);
|
---|
814 | unlink(node_name);
|
---|
815 | }
|
---|
816 |
|
---|
817 | if (ENABLE_FEATURE_MDEV_RENAME)
|
---|
818 | free(alias);
|
---|
819 |
|
---|
820 | /* We found matching line.
|
---|
821 | * Stop unless it was prefixed with '-'
|
---|
822 | */
|
---|
823 | if (!ENABLE_FEATURE_MDEV_CONF || !rule->keep_matching)
|
---|
824 | break;
|
---|
825 | } /* for (;;) */
|
---|
826 | }
|
---|
827 |
|
---|
828 | /* File callback for /sys/ traversal */
|
---|
829 | static int FAST_FUNC fileAction(const char *fileName,
|
---|
830 | struct stat *statbuf UNUSED_PARAM,
|
---|
831 | void *userData,
|
---|
832 | int depth UNUSED_PARAM)
|
---|
833 | {
|
---|
834 | size_t len = strlen(fileName) - 4; /* can't underflow */
|
---|
835 | char *scratch = userData;
|
---|
836 |
|
---|
837 | /* len check is for paranoid reasons */
|
---|
838 | if (strcmp(fileName + len, "/dev") != 0 || len >= PATH_MAX)
|
---|
839 | return FALSE;
|
---|
840 |
|
---|
841 | strcpy(scratch, fileName);
|
---|
842 | scratch[len] = '\0';
|
---|
843 | make_device(/*DEVNAME:*/ NULL, scratch, OP_add);
|
---|
844 |
|
---|
845 | return TRUE;
|
---|
846 | }
|
---|
847 |
|
---|
848 | /* Directory callback for /sys/ traversal */
|
---|
849 | static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
|
---|
850 | struct stat *statbuf UNUSED_PARAM,
|
---|
851 | void *userData UNUSED_PARAM,
|
---|
852 | int depth)
|
---|
853 | {
|
---|
854 | /* Extract device subsystem -- the name of the directory
|
---|
855 | * under /sys/class/ */
|
---|
856 | if (1 == depth) {
|
---|
857 | free(G.subsystem);
|
---|
858 | if (G.subsys_env) {
|
---|
859 | bb_unsetenv_and_free(G.subsys_env);
|
---|
860 | G.subsys_env = NULL;
|
---|
861 | }
|
---|
862 | G.subsystem = strrchr(fileName, '/');
|
---|
863 | if (G.subsystem) {
|
---|
864 | G.subsystem = xstrdup(G.subsystem + 1);
|
---|
865 | G.subsys_env = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
|
---|
866 | putenv(G.subsys_env);
|
---|
867 | }
|
---|
868 | }
|
---|
869 |
|
---|
870 | return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
|
---|
871 | }
|
---|
872 |
|
---|
873 | /* For the full gory details, see linux/Documentation/firmware_class/README
|
---|
874 | *
|
---|
875 | * Firmware loading works like this:
|
---|
876 | * - kernel sets FIRMWARE env var
|
---|
877 | * - userspace checks /lib/firmware/$FIRMWARE
|
---|
878 | * - userspace waits for /sys/$DEVPATH/loading to appear
|
---|
879 | * - userspace writes "1" to /sys/$DEVPATH/loading
|
---|
880 | * - userspace copies /lib/firmware/$FIRMWARE into /sys/$DEVPATH/data
|
---|
881 | * - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading
|
---|
882 | * - kernel loads firmware into device
|
---|
883 | */
|
---|
884 | static void load_firmware(const char *firmware, const char *sysfs_path)
|
---|
885 | {
|
---|
886 | int cnt;
|
---|
887 | int firmware_fd, loading_fd;
|
---|
888 |
|
---|
889 | /* check for /lib/firmware/$FIRMWARE */
|
---|
890 | xchdir("/lib/firmware");
|
---|
891 | firmware_fd = open(firmware, O_RDONLY); /* can fail */
|
---|
892 |
|
---|
893 | /* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */
|
---|
894 | xchdir(sysfs_path);
|
---|
895 | for (cnt = 0; cnt < 30; ++cnt) {
|
---|
896 | loading_fd = open("loading", O_WRONLY);
|
---|
897 | if (loading_fd >= 0)
|
---|
898 | goto loading;
|
---|
899 | sleep(1);
|
---|
900 | }
|
---|
901 | goto out;
|
---|
902 |
|
---|
903 | loading:
|
---|
904 | cnt = 0;
|
---|
905 | if (firmware_fd >= 0) {
|
---|
906 | int data_fd;
|
---|
907 |
|
---|
908 | /* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
|
---|
909 | if (full_write(loading_fd, "1", 1) != 1)
|
---|
910 | goto out;
|
---|
911 |
|
---|
912 | /* load firmware into /sys/$DEVPATH/data */
|
---|
913 | data_fd = open("data", O_WRONLY);
|
---|
914 | if (data_fd < 0)
|
---|
915 | goto out;
|
---|
916 | cnt = bb_copyfd_eof(firmware_fd, data_fd);
|
---|
917 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
918 | close(data_fd);
|
---|
919 | }
|
---|
920 |
|
---|
921 | /* Tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading"
|
---|
922 | * Note: we emit -1 also if firmware file wasn't found.
|
---|
923 | * There are cases when otherwise kernel would wait for minutes
|
---|
924 | * before timing out.
|
---|
925 | */
|
---|
926 | if (cnt > 0)
|
---|
927 | full_write(loading_fd, "0", 1);
|
---|
928 | else
|
---|
929 | full_write(loading_fd, "-1", 2);
|
---|
930 |
|
---|
931 | out:
|
---|
932 | xchdir("/dev");
|
---|
933 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
934 | close(firmware_fd);
|
---|
935 | close(loading_fd);
|
---|
936 | }
|
---|
937 | }
|
---|
938 |
|
---|
939 | static char *curtime(void)
|
---|
940 | {
|
---|
941 | struct timeval tv;
|
---|
942 | gettimeofday(&tv, NULL);
|
---|
943 | sprintf(G.timestr, "%u.%06u", (unsigned)tv.tv_sec % 60, (unsigned)tv.tv_usec);
|
---|
944 | return G.timestr;
|
---|
945 | }
|
---|
946 |
|
---|
947 | static void open_mdev_log(const char *seq, unsigned my_pid)
|
---|
948 | {
|
---|
949 | int logfd = open("mdev.log", O_WRONLY | O_APPEND);
|
---|
950 | if (logfd >= 0) {
|
---|
951 | xmove_fd(logfd, STDERR_FILENO);
|
---|
952 | G.verbose = 2;
|
---|
953 | applet_name = xasprintf("%s[%s]", applet_name, seq ? seq : utoa(my_pid));
|
---|
954 | }
|
---|
955 | }
|
---|
956 |
|
---|
957 | /* If it exists, does /dev/mdev.seq match $SEQNUM?
|
---|
958 | * If it does not match, earlier mdev is running
|
---|
959 | * in parallel, and we need to wait.
|
---|
960 | * Active mdev pokes us with SIGCHLD to check the new file.
|
---|
961 | */
|
---|
962 | static int
|
---|
963 | wait_for_seqfile(const char *seq)
|
---|
964 | {
|
---|
965 | /* We time out after 2 sec */
|
---|
966 | static const struct timespec ts = { 0, 32*1000*1000 };
|
---|
967 | int timeout = 2000 / 32;
|
---|
968 | int seq_fd = -1;
|
---|
969 | int do_once = 1;
|
---|
970 | sigset_t set_CHLD;
|
---|
971 |
|
---|
972 | sigemptyset(&set_CHLD);
|
---|
973 | sigaddset(&set_CHLD, SIGCHLD);
|
---|
974 | sigprocmask(SIG_BLOCK, &set_CHLD, NULL);
|
---|
975 |
|
---|
976 | for (;;) {
|
---|
977 | int seqlen;
|
---|
978 | char seqbuf[sizeof(int)*3 + 2];
|
---|
979 |
|
---|
980 | if (seq_fd < 0) {
|
---|
981 | seq_fd = open("mdev.seq", O_RDWR);
|
---|
982 | if (seq_fd < 0)
|
---|
983 | break;
|
---|
984 | }
|
---|
985 | seqlen = pread(seq_fd, seqbuf, sizeof(seqbuf) - 1, 0);
|
---|
986 | if (seqlen < 0) {
|
---|
987 | close(seq_fd);
|
---|
988 | seq_fd = -1;
|
---|
989 | break;
|
---|
990 | }
|
---|
991 | seqbuf[seqlen] = '\0';
|
---|
992 | if (seqbuf[0] == '\n') {
|
---|
993 | /* seed file: write out seq ASAP */
|
---|
994 | xwrite_str(seq_fd, seq);
|
---|
995 | xlseek(seq_fd, 0, SEEK_SET);
|
---|
996 | dbg2("first seq written");
|
---|
997 | break;
|
---|
998 | }
|
---|
999 | if (strcmp(seq, seqbuf) == 0) {
|
---|
1000 | /* correct idx */
|
---|
1001 | break;
|
---|
1002 | }
|
---|
1003 | if (do_once) {
|
---|
1004 | dbg2("%s waiting for '%s'", curtime(), seqbuf);
|
---|
1005 | do_once = 0;
|
---|
1006 | }
|
---|
1007 | if (sigtimedwait(&set_CHLD, NULL, &ts) >= 0) {
|
---|
1008 | dbg3("woken up");
|
---|
1009 | continue; /* don't decrement timeout! */
|
---|
1010 | }
|
---|
1011 | if (--timeout == 0) {
|
---|
1012 | dbg1("%s waiting for '%s'", "timed out", seqbuf);
|
---|
1013 | break;
|
---|
1014 | }
|
---|
1015 | }
|
---|
1016 | sigprocmask(SIG_UNBLOCK, &set_CHLD, NULL);
|
---|
1017 | return seq_fd;
|
---|
1018 | }
|
---|
1019 |
|
---|
1020 | static void signal_mdevs(unsigned my_pid)
|
---|
1021 | {
|
---|
1022 | procps_status_t* p = NULL;
|
---|
1023 | while ((p = procps_scan(p, PSSCAN_ARGV0)) != NULL) {
|
---|
1024 | if (p->pid != my_pid
|
---|
1025 | && p->argv0
|
---|
1026 | && strcmp(bb_basename(p->argv0), "mdev") == 0
|
---|
1027 | ) {
|
---|
1028 | kill(p->pid, SIGCHLD);
|
---|
1029 | }
|
---|
1030 | }
|
---|
1031 | }
|
---|
1032 |
|
---|
1033 | int mdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
1034 | int mdev_main(int argc UNUSED_PARAM, char **argv)
|
---|
1035 | {
|
---|
1036 | RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
|
---|
1037 |
|
---|
1038 | INIT_G();
|
---|
1039 |
|
---|
1040 | #if ENABLE_FEATURE_MDEV_CONF
|
---|
1041 | G.filename = "/etc/mdev.conf";
|
---|
1042 | #endif
|
---|
1043 |
|
---|
1044 | /* We can be called as hotplug helper */
|
---|
1045 | /* Kernel cannot provide suitable stdio fds for us, do it ourself */
|
---|
1046 | bb_sanitize_stdio();
|
---|
1047 |
|
---|
1048 | /* Force the configuration file settings exactly */
|
---|
1049 | umask(0);
|
---|
1050 |
|
---|
1051 | xchdir("/dev");
|
---|
1052 |
|
---|
1053 | if (argv[1] && strcmp(argv[1], "-s") == 0) {
|
---|
1054 | /*
|
---|
1055 | * Scan: mdev -s
|
---|
1056 | */
|
---|
1057 | struct stat st;
|
---|
1058 |
|
---|
1059 | #if ENABLE_FEATURE_MDEV_CONF
|
---|
1060 | /* Same as xrealloc_vector(NULL, 4, 0): */
|
---|
1061 | G.rule_vec = xzalloc((1 << 4) * sizeof(*G.rule_vec));
|
---|
1062 | #endif
|
---|
1063 | xstat("/", &st);
|
---|
1064 | G.root_major = major(st.st_dev);
|
---|
1065 | G.root_minor = minor(st.st_dev);
|
---|
1066 |
|
---|
1067 | putenv((char*)"ACTION=add");
|
---|
1068 |
|
---|
1069 | /* ACTION_FOLLOWLINKS is needed since in newer kernels
|
---|
1070 | * /sys/block/loop* (for example) are symlinks to dirs,
|
---|
1071 | * not real directories.
|
---|
1072 | * (kernel's CONFIG_SYSFS_DEPRECATED makes them real dirs,
|
---|
1073 | * but we can't enforce that on users)
|
---|
1074 | */
|
---|
1075 | if (access("/sys/class/block", F_OK) != 0) {
|
---|
1076 | /* Scan obsolete /sys/block only if /sys/class/block
|
---|
1077 | * doesn't exist. Otherwise we'll have dupes.
|
---|
1078 | * Also, do not complain if it doesn't exist.
|
---|
1079 | * Some people configure kernel to have no blockdevs.
|
---|
1080 | */
|
---|
1081 | recursive_action("/sys/block",
|
---|
1082 | ACTION_RECURSE | ACTION_FOLLOWLINKS | ACTION_QUIET,
|
---|
1083 | fileAction, dirAction, temp, 0);
|
---|
1084 | }
|
---|
1085 | recursive_action("/sys/class",
|
---|
1086 | ACTION_RECURSE | ACTION_FOLLOWLINKS,
|
---|
1087 | fileAction, dirAction, temp, 0);
|
---|
1088 | } else {
|
---|
1089 | char *fw;
|
---|
1090 | char *seq;
|
---|
1091 | char *action;
|
---|
1092 | char *env_devname;
|
---|
1093 | char *env_devpath;
|
---|
1094 | unsigned my_pid;
|
---|
1095 | int seq_fd;
|
---|
1096 | smalluint op;
|
---|
1097 |
|
---|
1098 | /* Hotplug:
|
---|
1099 | * env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
|
---|
1100 | * ACTION can be "add", "remove", "change"
|
---|
1101 | * DEVPATH is like "/block/sda" or "/class/input/mice"
|
---|
1102 | */
|
---|
1103 | action = getenv("ACTION");
|
---|
1104 | op = index_in_strings(keywords, action);
|
---|
1105 | env_devname = getenv("DEVNAME"); /* can be NULL */
|
---|
1106 | env_devpath = getenv("DEVPATH");
|
---|
1107 | G.subsystem = getenv("SUBSYSTEM");
|
---|
1108 | if (!action || !env_devpath /*|| !G.subsystem*/)
|
---|
1109 | bb_show_usage();
|
---|
1110 | fw = getenv("FIRMWARE");
|
---|
1111 | seq = getenv("SEQNUM");
|
---|
1112 |
|
---|
1113 | my_pid = getpid();
|
---|
1114 | open_mdev_log(seq, my_pid);
|
---|
1115 |
|
---|
1116 | seq_fd = seq ? wait_for_seqfile(seq) : -1;
|
---|
1117 |
|
---|
1118 | dbg1("%s "
|
---|
1119 | "ACTION:%s SUBSYSTEM:%s DEVNAME:%s DEVPATH:%s"
|
---|
1120 | "%s%s",
|
---|
1121 | curtime(),
|
---|
1122 | action, G.subsystem, env_devname, env_devpath,
|
---|
1123 | fw ? " FW:" : "", fw ? fw : ""
|
---|
1124 | );
|
---|
1125 |
|
---|
1126 | snprintf(temp, PATH_MAX, "/sys%s", env_devpath);
|
---|
1127 | if (op == OP_remove) {
|
---|
1128 | /* Ignoring "remove firmware". It was reported
|
---|
1129 | * to happen and to cause erroneous deletion
|
---|
1130 | * of device nodes. */
|
---|
1131 | if (!fw)
|
---|
1132 | make_device(env_devname, temp, op);
|
---|
1133 | }
|
---|
1134 | else {
|
---|
1135 | make_device(env_devname, temp, op);
|
---|
1136 | if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
|
---|
1137 | if (op == OP_add && fw)
|
---|
1138 | load_firmware(fw, temp);
|
---|
1139 | }
|
---|
1140 | }
|
---|
1141 |
|
---|
1142 | dbg1("%s exiting", curtime());
|
---|
1143 | if (seq_fd >= 0) {
|
---|
1144 | xwrite_str(seq_fd, utoa(xatou(seq) + 1));
|
---|
1145 | signal_mdevs(my_pid);
|
---|
1146 | }
|
---|
1147 | }
|
---|
1148 |
|
---|
1149 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
1150 | RELEASE_CONFIG_BUFFER(temp);
|
---|
1151 |
|
---|
1152 | return EXIT_SUCCESS;
|
---|
1153 | }
|
---|