[1765] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
[821] | 3 | * mdev - Mini udev for busybox
|
---|
| 4 | *
|
---|
| 5 | * Copyright 2005 Rob Landley <rob@landley.net>
|
---|
| 6 | * Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
|
---|
| 7 | *
|
---|
[2725] | 8 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
---|
[821] | 9 | */
|
---|
[3232] | 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 $SEQNUM variable. This prevents plug/unplug races.\n"
|
---|
| 95 | //usage: "To activate this feature, create empty /dev/mdev.seq at boot.\n"
|
---|
| 96 | //usage: "\n"
|
---|
| 97 | //usage: "If /dev/mdev.log file exists, debug log will be appended to it."
|
---|
| 98 |
|
---|
[1765] | 99 | #include "libbb.h"
|
---|
[821] | 100 | #include "xregex.h"
|
---|
| 101 |
|
---|
[2725] | 102 | /* "mdev -s" scans /sys/class/xxx, looking for directories which have dev
|
---|
| 103 | * file (it is of the form "M:m\n"). Example: /sys/class/tty/tty0/dev
|
---|
| 104 | * contains "4:0\n". Directory name is taken as device name, path component
|
---|
| 105 | * directly after /sys/class/ as subsystem. In this example, "tty0" and "tty".
|
---|
| 106 | * Then mdev creates the /dev/device_name node.
|
---|
| 107 | * If /sys/class/.../dev file does not exist, mdev still may act
|
---|
| 108 | * on this device: see "@|$|*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 | *
|
---|
[3232] | 123 | * $envvar=regex format is useful for loading modules for hot-plugged devices
|
---|
[2725] | 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 |
|
---|
[3232] | 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 |
|
---|
[1765] | 274 | struct globals {
|
---|
[821] | 275 | int root_major, root_minor;
|
---|
[3232] | 276 | smallint verbose;
|
---|
[2725] | 277 | char *subsystem;
|
---|
[3232] | 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")];
|
---|
[2725] | 287 | } FIX_ALIASING;
|
---|
[1765] | 288 | #define G (*(struct globals*)&bb_common_bufsiz1)
|
---|
[3232] | 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)
|
---|
[821] | 293 |
|
---|
[3232] | 294 |
|
---|
[2725] | 295 | /* Prevent infinite loops in /sys symlinks */
|
---|
| 296 | #define MAX_SYSFS_DEPTH 3
|
---|
[821] | 297 |
|
---|
[3232] | 298 | /* We use additional bytes in make_device() */
|
---|
| 299 | #define SCRATCH_SIZE 128
|
---|
[2725] | 300 |
|
---|
[3232] | 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 |
|
---|
[2725] | 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 */
|
---|
[3232] | 547 | mkdir_recursive(alias);
|
---|
[2725] | 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
|
---|
[3232] | 561 | * after NUL, but we promise to not mangle (IOW: to restore NUL if needed)
|
---|
[2725] | 562 | * path string.
|
---|
| 563 | * NB2: "mdev -s" may call us many times, do not leak memory/fds!
|
---|
[3232] | 564 | *
|
---|
| 565 | * device_name = $DEVNAME (may be NULL)
|
---|
| 566 | * path = /sys/$DEVPATH
|
---|
[2725] | 567 | */
|
---|
[3232] | 568 | static void make_device(char *device_name, char *path, int operation)
|
---|
[821] | 569 | {
|
---|
[1765] | 570 | int major, minor, type, len;
|
---|
[3232] | 571 | char *path_end = path + strlen(path);
|
---|
[821] | 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
|
---|
[2725] | 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;
|
---|
[3232] | 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';
|
---|
[2725] | 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 */
|
---|
[3232] | 588 | } else if (sscanf(path_end + 1, "%u:%u", &major, &minor) == 2) {
|
---|
| 589 | dbg1("dev %u,%u", major, minor);
|
---|
| 590 | } else {
|
---|
[2725] | 591 | major = -1;
|
---|
| 592 | }
|
---|
[902] | 593 | }
|
---|
[2725] | 594 | /* else: for delete, -1 still deletes the node, but < -1 suppresses that */
|
---|
[821] | 595 |
|
---|
[3232] | 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
|
---|
[2725] | 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.
|
---|
[3232] | 627 | * We use strstr("/block/") to forestall future surprises.
|
---|
| 628 | */
|
---|
[2725] | 629 | type = S_IFCHR;
|
---|
| 630 | if (strstr(path, "/block/") || (G.subsystem && strncmp(G.subsystem, "block", 5) == 0))
|
---|
| 631 | type = S_IFBLK;
|
---|
[821] | 632 |
|
---|
[3232] | 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;
|
---|
[2725] | 641 | char aliaslink = aliaslink; /* for compiler */
|
---|
[3232] | 642 | char *node_name;
|
---|
| 643 | const struct rule *rule;
|
---|
[821] | 644 |
|
---|
[3232] | 645 | str_to_match = device_name;
|
---|
[821] | 646 |
|
---|
[3232] | 647 | rule = next_rule();
|
---|
[821] | 648 |
|
---|
[3232] | 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 */
|
---|
[821] | 667 |
|
---|
[3232] | 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 | //}
|
---|
[2725] | 678 |
|
---|
[3232] | 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 */
|
---|
[2725] | 685 | }
|
---|
[3232] | 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;
|
---|
[2725] | 698 | }
|
---|
[3232] | 699 | else if (aliaslink == '>' || aliaslink == '=') {
|
---|
| 700 | if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
|
---|
| 701 | char *s;
|
---|
| 702 | char *p;
|
---|
| 703 | unsigned n;
|
---|
[2725] | 704 |
|
---|
[3232] | 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++;
|
---|
[821] | 711 |
|
---|
[3232] | 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++;
|
---|
[2725] | 723 | }
|
---|
| 724 | }
|
---|
[3232] | 725 | p++;
|
---|
| 726 | s++;
|
---|
[1765] | 727 | }
|
---|
[3232] | 728 | } else {
|
---|
| 729 | alias = xstrdup(rule->ren_mov + 1);
|
---|
[1765] | 730 | }
|
---|
[2725] | 731 | }
|
---|
[3232] | 732 | }
|
---|
| 733 | dbg3("alias:'%s'", alias);
|
---|
[821] | 734 |
|
---|
[3232] | 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;
|
---|
[2725] | 748 | }
|
---|
| 749 | }
|
---|
[3232] | 750 | dbg3("command:'%s'", command);
|
---|
[821] | 751 |
|
---|
[2725] | 752 | /* "Execute" the line we found */
|
---|
[3232] | 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 | }
|
---|
[2725] | 758 |
|
---|
[3232] | 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);
|
---|
[2725] | 792 | }
|
---|
[1765] | 793 | }
|
---|
[3232] | 794 | }
|
---|
[821] | 795 |
|
---|
[3232] | 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 | }
|
---|
[821] | 805 |
|
---|
[3232] | 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);
|
---|
[2725] | 811 | }
|
---|
| 812 | }
|
---|
[3232] | 813 | dbg1("unlink: %s", node_name);
|
---|
| 814 | unlink(node_name);
|
---|
[821] | 815 | }
|
---|
| 816 |
|
---|
[3232] | 817 | if (ENABLE_FEATURE_MDEV_RENAME)
|
---|
| 818 | free(alias);
|
---|
| 819 |
|
---|
[2725] | 820 | /* We found matching line.
|
---|
[3232] | 821 | * Stop unless it was prefixed with '-'
|
---|
| 822 | */
|
---|
| 823 | if (!ENABLE_FEATURE_MDEV_CONF || !rule->keep_matching)
|
---|
[2725] | 824 | break;
|
---|
[3232] | 825 | } /* for (;;) */
|
---|
[821] | 826 | }
|
---|
| 827 |
|
---|
[1765] | 828 | /* File callback for /sys/ traversal */
|
---|
[2725] | 829 | static int FAST_FUNC fileAction(const char *fileName,
|
---|
| 830 | struct stat *statbuf UNUSED_PARAM,
|
---|
| 831 | void *userData,
|
---|
| 832 | int depth UNUSED_PARAM)
|
---|
[1765] | 833 | {
|
---|
[2725] | 834 | size_t len = strlen(fileName) - 4; /* can't underflow */
|
---|
[1765] | 835 | char *scratch = userData;
|
---|
[821] | 836 |
|
---|
[2725] | 837 | /* len check is for paranoid reasons */
|
---|
| 838 | if (strcmp(fileName + len, "/dev") != 0 || len >= PATH_MAX)
|
---|
[1765] | 839 | return FALSE;
|
---|
| 840 |
|
---|
| 841 | strcpy(scratch, fileName);
|
---|
[2725] | 842 | scratch[len] = '\0';
|
---|
[3232] | 843 | make_device(/*DEVNAME:*/ NULL, scratch, OP_add);
|
---|
[1765] | 844 |
|
---|
| 845 | return TRUE;
|
---|
| 846 | }
|
---|
| 847 |
|
---|
| 848 | /* Directory callback for /sys/ traversal */
|
---|
[2725] | 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)
|
---|
[821] | 853 | {
|
---|
[2725] | 854 | /* Extract device subsystem -- the name of the directory
|
---|
| 855 | * under /sys/class/ */
|
---|
| 856 | if (1 == depth) {
|
---|
| 857 | free(G.subsystem);
|
---|
[3232] | 858 | if (G.subsys_env) {
|
---|
| 859 | bb_unsetenv_and_free(G.subsys_env);
|
---|
| 860 | G.subsys_env = NULL;
|
---|
| 861 | }
|
---|
[2725] | 862 | G.subsystem = strrchr(fileName, '/');
|
---|
[3232] | 863 | if (G.subsystem) {
|
---|
[2725] | 864 | G.subsystem = xstrdup(G.subsystem + 1);
|
---|
[3232] | 865 | G.subsys_env = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
|
---|
| 866 | putenv(G.subsys_env);
|
---|
| 867 | }
|
---|
[2725] | 868 | }
|
---|
| 869 |
|
---|
[1765] | 870 | return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
|
---|
| 871 | }
|
---|
[821] | 872 |
|
---|
[1765] | 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 | */
|
---|
[2725] | 884 | static void load_firmware(const char *firmware, const char *sysfs_path)
|
---|
[1765] | 885 | {
|
---|
| 886 | int cnt;
|
---|
[3232] | 887 | int firmware_fd, loading_fd;
|
---|
[821] | 888 |
|
---|
[1765] | 889 | /* check for /lib/firmware/$FIRMWARE */
|
---|
| 890 | xchdir("/lib/firmware");
|
---|
[3232] | 891 | firmware_fd = open(firmware, O_RDONLY); /* can fail */
|
---|
[821] | 892 |
|
---|
[1765] | 893 | /* check for /sys/$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);
|
---|
[3232] | 897 | if (loading_fd >= 0)
|
---|
[2725] | 898 | goto loading;
|
---|
| 899 | sleep(1);
|
---|
[1765] | 900 | }
|
---|
[2725] | 901 | goto out;
|
---|
[821] | 902 |
|
---|
[2725] | 903 | loading:
|
---|
[3232] | 904 | cnt = 0;
|
---|
| 905 | if (firmware_fd >= 0) {
|
---|
| 906 | int data_fd;
|
---|
[821] | 907 |
|
---|
[3232] | 908 | /* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
|
---|
| 909 | if (full_write(loading_fd, "1", 1) != 1)
|
---|
| 910 | goto out;
|
---|
[821] | 911 |
|
---|
[3232] | 912 | /* load firmware into /sys/$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 | */
|
---|
[1765] | 926 | if (cnt > 0)
|
---|
[2725] | 927 | full_write(loading_fd, "0", 1);
|
---|
[1765] | 928 | else
|
---|
[2725] | 929 | full_write(loading_fd, "-1", 2);
|
---|
[1765] | 930 |
|
---|
| 931 | out:
|
---|
[3232] | 932 | xchdir("/dev");
|
---|
[1765] | 933 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 934 | close(firmware_fd);
|
---|
| 935 | close(loading_fd);
|
---|
[821] | 936 | }
|
---|
| 937 | }
|
---|
| 938 |
|
---|
[3232] | 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 |
|
---|
[2725] | 1033 | int mdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1034 | int mdev_main(int argc UNUSED_PARAM, char **argv)
|
---|
[821] | 1035 | {
|
---|
[2725] | 1036 | RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
|
---|
[821] | 1037 |
|
---|
[3232] | 1038 | INIT_G();
|
---|
| 1039 |
|
---|
| 1040 | #if ENABLE_FEATURE_MDEV_CONF
|
---|
| 1041 | G.filename = "/etc/mdev.conf";
|
---|
| 1042 | #endif
|
---|
| 1043 |
|
---|
[2725] | 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 |
|
---|
[1765] | 1051 | xchdir("/dev");
|
---|
[821] | 1052 |
|
---|
[2725] | 1053 | if (argv[1] && strcmp(argv[1], "-s") == 0) {
|
---|
[3232] | 1054 | /*
|
---|
| 1055 | * Scan: mdev -s
|
---|
[2725] | 1056 | */
|
---|
[821] | 1057 | struct stat st;
|
---|
| 1058 |
|
---|
[3232] | 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
|
---|
[1765] | 1063 | xstat("/", &st);
|
---|
[2725] | 1064 | G.root_major = major(st.st_dev);
|
---|
| 1065 | G.root_minor = minor(st.st_dev);
|
---|
[821] | 1066 |
|
---|
[3232] | 1067 | putenv((char*)"ACTION=add");
|
---|
| 1068 |
|
---|
[2725] | 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 | }
|
---|
[1765] | 1085 | recursive_action("/sys/class",
|
---|
| 1086 | ACTION_RECURSE | ACTION_FOLLOWLINKS,
|
---|
| 1087 | fileAction, dirAction, temp, 0);
|
---|
[2725] | 1088 | } else {
|
---|
| 1089 | char *fw;
|
---|
| 1090 | char *seq;
|
---|
| 1091 | char *action;
|
---|
[3232] | 1092 | char *env_devname;
|
---|
| 1093 | char *env_devpath;
|
---|
| 1094 | unsigned my_pid;
|
---|
| 1095 | int seq_fd;
|
---|
[2725] | 1096 | smalluint op;
|
---|
[1765] | 1097 |
|
---|
[2725] | 1098 | /* Hotplug:
|
---|
| 1099 | * env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
|
---|
[3232] | 1100 | * ACTION can be "add", "remove", "change"
|
---|
[2725] | 1101 | * DEVPATH is like "/block/sda" or "/class/input/mice"
|
---|
| 1102 | */
|
---|
[821] | 1103 | action = getenv("ACTION");
|
---|
[3232] | 1104 | op = index_in_strings(keywords, action);
|
---|
| 1105 | env_devname = getenv("DEVNAME"); /* can be NULL */
|
---|
| 1106 | env_devpath = getenv("DEVPATH");
|
---|
[2725] | 1107 | G.subsystem = getenv("SUBSYSTEM");
|
---|
[3232] | 1108 | if (!action || !env_devpath /*|| !G.subsystem*/)
|
---|
[821] | 1109 | bb_show_usage();
|
---|
[2725] | 1110 | fw = getenv("FIRMWARE");
|
---|
| 1111 | seq = getenv("SEQNUM");
|
---|
[821] | 1112 |
|
---|
[3232] | 1113 | my_pid = getpid();
|
---|
| 1114 | open_mdev_log(seq, my_pid);
|
---|
[1765] | 1115 |
|
---|
[3232] | 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);
|
---|
[2725] | 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)
|
---|
[3232] | 1132 | make_device(env_devname, temp, op);
|
---|
[1765] | 1133 | }
|
---|
[3232] | 1134 | else {
|
---|
| 1135 | make_device(env_devname, temp, op);
|
---|
[2725] | 1136 | if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
|
---|
[3232] | 1137 | if (op == OP_add && fw)
|
---|
[2725] | 1138 | load_firmware(fw, temp);
|
---|
| 1139 | }
|
---|
| 1140 | }
|
---|
| 1141 |
|
---|
[3232] | 1142 | dbg1("%s exiting", curtime());
|
---|
| 1143 | if (seq_fd >= 0) {
|
---|
| 1144 | xwrite_str(seq_fd, utoa(xatou(seq) + 1));
|
---|
| 1145 | signal_mdevs(my_pid);
|
---|
[2725] | 1146 | }
|
---|
[821] | 1147 | }
|
---|
| 1148 |
|
---|
[2725] | 1149 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 1150 | RELEASE_CONFIG_BUFFER(temp);
|
---|
| 1151 |
|
---|
| 1152 | return EXIT_SUCCESS;
|
---|
[821] | 1153 | }
|
---|