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This was seen to happen if two mdevs are run in parallel, mdev.seq is empty, and the "newer" one manages to write it first. function old new delta mdev_main 1366 1388 +22 atoll - 20 +20 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1156 lines
31 KiB
C
1156 lines
31 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* mdev - Mini udev for busybox
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*
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* Copyright 2005 Rob Landley <rob@landley.net>
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* Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config MDEV
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//config: bool "mdev"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: mdev is a mini-udev implementation for dynamically creating device
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//config: nodes in the /dev directory.
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//config:
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//config: For more information, please see docs/mdev.txt
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//config:
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//config:config FEATURE_MDEV_CONF
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//config: bool "Support /etc/mdev.conf"
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//config: default y
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//config: depends on MDEV
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//config: help
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//config: Add support for the mdev config file to control ownership and
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//config: permissions of the device nodes.
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//config:
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//config: For more information, please see docs/mdev.txt
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//config:
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//config:config FEATURE_MDEV_RENAME
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//config: bool "Support subdirs/symlinks"
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//config: default y
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//config: depends on FEATURE_MDEV_CONF
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//config: help
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//config: Add support for renaming devices and creating symlinks.
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//config:
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//config: For more information, please see docs/mdev.txt
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//config:
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//config:config FEATURE_MDEV_RENAME_REGEXP
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//config: bool "Support regular expressions substitutions when renaming device"
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//config: default y
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//config: depends on FEATURE_MDEV_RENAME
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//config: help
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//config: Add support for regular expressions substitutions when renaming
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//config: device.
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//config:
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//config:config FEATURE_MDEV_EXEC
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//config: bool "Support command execution at device addition/removal"
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//config: default y
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//config: depends on FEATURE_MDEV_CONF
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//config: help
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//config: This adds support for an optional field to /etc/mdev.conf for
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//config: executing commands when devices are created/removed.
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//config:
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//config: For more information, please see docs/mdev.txt
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//config:
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//config:config FEATURE_MDEV_LOAD_FIRMWARE
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//config: bool "Support loading of firmwares"
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//config: default y
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//config: depends on MDEV
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//config: help
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//config: Some devices need to load firmware before they can be usable.
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//config:
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//config: These devices will request userspace look up the files in
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//config: /lib/firmware/ and if it exists, send it to the kernel for
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//config: loading into the hardware.
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//applet:IF_MDEV(APPLET(mdev, BB_DIR_SBIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_MDEV) += mdev.o
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//usage:#define mdev_trivial_usage
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//usage: "[-s]"
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//usage:#define mdev_full_usage "\n\n"
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//usage: "mdev -s is to be run during boot to scan /sys and populate /dev.\n"
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//usage: "\n"
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//usage: "Bare mdev is a kernel hotplug helper. To activate it:\n"
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//usage: " echo /sbin/mdev >/proc/sys/kernel/hotplug\n"
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//usage: IF_FEATURE_MDEV_CONF(
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//usage: "\n"
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//usage: "It uses /etc/mdev.conf with lines\n"
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//usage: " [-][ENV=regex;]...DEVNAME UID:GID PERM"
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//usage: IF_FEATURE_MDEV_RENAME(" [>|=PATH]|[!]")
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//usage: IF_FEATURE_MDEV_EXEC(" [@|$|*PROG]")
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//usage: "\n"
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//usage: "where DEVNAME is device name regex, @major,minor[-minor2], or\n"
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//usage: "environment variable regex. A common use of the latter is\n"
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//usage: "to load modules for hotplugged devices:\n"
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//usage: " $MODALIAS=.* 0:0 660 @modprobe \"$MODALIAS\"\n"
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//usage: )
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//usage: "\n"
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//usage: "If /dev/mdev.seq file exists, mdev will wait for its value\n"
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//usage: "to match $SEQNUM variable. This prevents plug/unplug races.\n"
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//usage: "To activate this feature, create empty /dev/mdev.seq at boot.\n"
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//usage: "\n"
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//usage: "If /dev/mdev.log file exists, debug log will be appended to it."
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#include "libbb.h"
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#include "xregex.h"
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/* "mdev -s" scans /sys/class/xxx, looking for directories which have dev
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* file (it is of the form "M:m\n"). Example: /sys/class/tty/tty0/dev
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* contains "4:0\n". Directory name is taken as device name, path component
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* directly after /sys/class/ as subsystem. In this example, "tty0" and "tty".
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* Then mdev creates the /dev/device_name node.
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* If /sys/class/.../dev file does not exist, mdev still may act
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* on this device: see "@|$|*command args..." parameter in config file.
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*
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* mdev w/o parameters is called as hotplug helper. It takes device
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* and subsystem names from $DEVPATH and $SUBSYSTEM, extracts
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* maj,min from "/sys/$DEVPATH/dev" and also examines
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* $ACTION ("add"/"delete") and $FIRMWARE.
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*
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* If action is "add", mdev creates /dev/device_name similarly to mdev -s.
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* (todo: explain "delete" and $FIRMWARE)
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*
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* If /etc/mdev.conf exists, it may modify /dev/device_name's properties.
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*
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* Leading minus in 1st field means "don't stop on this line", otherwise
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* search is stopped after the matching line is encountered.
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*
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* $envvar=regex format is useful for loading modules for hot-plugged devices
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* which do not have driver loaded yet. In this case /sys/class/.../dev
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* does not exist, but $MODALIAS is set to needed module's name
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* (actually, an alias to it) by kernel. This rule instructs mdev
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* to load the module and exit:
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* $MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"
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* The kernel will generate another hotplug event when /sys/class/.../dev
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* file appears.
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*
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* When line matches, the device node is created, chmod'ed and chown'ed,
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* moved to path, and if >path, a symlink to moved node is created,
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* all this if /sys/class/.../dev exists.
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* Examples:
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* =loop/ - moves to /dev/loop
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* >disk/sda%1 - moves to /dev/disk/sdaN, makes /dev/sdaN a symlink
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*
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* Then "command args..." is executed (via sh -c 'command args...').
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* @:execute on creation, $:on deletion, *:on both.
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* This happens regardless of /sys/class/.../dev existence.
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*/
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/* Kernel's hotplug environment constantly changes.
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* Here are new cases I observed on 3.1.0:
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*
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* Case with $DEVNAME and $DEVICE, not just $DEVPATH:
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* ACTION=add
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* BUSNUM=001
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* DEVICE=/proc/bus/usb/001/003
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* DEVNAME=bus/usb/001/003
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* DEVNUM=003
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* DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5
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* DEVTYPE=usb_device
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* MAJOR=189
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* MINOR=2
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* PRODUCT=18d1/4e12/227
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* SUBSYSTEM=usb
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* TYPE=0/0/0
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*
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* Case with $DEVICE, but no $DEVNAME - apparenty, usb iface notification?
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* "Please load me a module" thing?
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* ACTION=add
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* DEVICE=/proc/bus/usb/001/003
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* DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0
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* DEVTYPE=usb_interface
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* INTERFACE=8/6/80
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* MODALIAS=usb:v18D1p4E12d0227dc00dsc00dp00ic08isc06ip50
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* PRODUCT=18d1/4e12/227
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* SUBSYSTEM=usb
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* TYPE=0/0/0
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*
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* ACTION=add
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* DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5
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* DEVTYPE=scsi_host
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* SUBSYSTEM=scsi
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*
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* ACTION=add
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* DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/scsi_host/host5
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* SUBSYSTEM=scsi_host
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*
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* ACTION=add
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* DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0
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* DEVTYPE=scsi_target
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* SUBSYSTEM=scsi
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*
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* Case with strange $MODALIAS:
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* ACTION=add
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* DEVPATH=/devices/pci0000:00/0000:00:02.1/usb1/1-5/1-5:1.0/host5/target5:0:0/5:0:0:0
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* DEVTYPE=scsi_device
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* MODALIAS=scsi:t-0x00
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* SUBSYSTEM=scsi
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*
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* ACTION=add
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* 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
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* SUBSYSTEM=scsi_disk
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*
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* ACTION=add
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* 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
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* SUBSYSTEM=scsi_device
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*
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* Case with explicit $MAJOR/$MINOR (no need to read /sys/$DEVPATH/dev?):
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* ACTION=add
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* DEVNAME=bsg/5:0:0:0
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* 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
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* MAJOR=253
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* MINOR=1
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* SUBSYSTEM=bsg
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*
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* ACTION=add
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* DEVPATH=/devices/virtual/bdi/8:16
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* SUBSYSTEM=bdi
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*
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* ACTION=add
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* DEVNAME=sdb
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* DEVPATH=/block/sdb
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* DEVTYPE=disk
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* MAJOR=8
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* MINOR=16
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* SUBSYSTEM=block
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*
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* Case with ACTION=change:
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* ACTION=change
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* DEVNAME=sdb
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* DEVPATH=/block/sdb
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* DEVTYPE=disk
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* DISK_MEDIA_CHANGE=1
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* MAJOR=8
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* MINOR=16
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* SUBSYSTEM=block
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*/
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#define DEBUG_LVL 2
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#if DEBUG_LVL >= 1
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# define dbg1(...) do { if (G.verbose) bb_error_msg(__VA_ARGS__); } while(0)
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#else
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# define dbg1(...) ((void)0)
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#endif
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#if DEBUG_LVL >= 2
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# define dbg2(...) do { if (G.verbose >= 2) bb_error_msg(__VA_ARGS__); } while(0)
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#else
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# define dbg2(...) ((void)0)
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#endif
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#if DEBUG_LVL >= 3
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# define dbg3(...) do { if (G.verbose >= 3) bb_error_msg(__VA_ARGS__); } while(0)
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#else
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# define dbg3(...) ((void)0)
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#endif
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static const char keywords[] ALIGN1 = "add\0remove\0"; // "change\0"
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enum { OP_add, OP_remove };
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struct envmatch {
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struct envmatch *next;
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char *envname;
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regex_t match;
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};
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struct rule {
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bool keep_matching;
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bool regex_compiled;
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mode_t mode;
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int maj, min0, min1;
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struct bb_uidgid_t ugid;
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char *envvar;
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char *ren_mov;
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IF_FEATURE_MDEV_EXEC(char *r_cmd;)
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regex_t match;
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struct envmatch *envmatch;
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};
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struct globals {
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int root_major, root_minor;
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smallint verbose;
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char *subsystem;
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char *subsys_env; /* for putenv("SUBSYSTEM=subsystem") */
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#if ENABLE_FEATURE_MDEV_CONF
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const char *filename;
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parser_t *parser;
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struct rule **rule_vec;
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unsigned rule_idx;
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#endif
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struct rule cur_rule;
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char timestr[sizeof("HH:MM:SS.123456")];
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { \
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IF_NOT_FEATURE_MDEV_CONF(G.cur_rule.maj = -1;) \
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IF_NOT_FEATURE_MDEV_CONF(G.cur_rule.mode = 0660;) \
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} while (0)
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/* Prevent infinite loops in /sys symlinks */
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#define MAX_SYSFS_DEPTH 3
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/* We use additional bytes in make_device() */
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#define SCRATCH_SIZE 128
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#if ENABLE_FEATURE_MDEV_CONF
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static void make_default_cur_rule(void)
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{
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memset(&G.cur_rule, 0, sizeof(G.cur_rule));
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G.cur_rule.maj = -1; /* "not a @major,minor rule" */
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G.cur_rule.mode = 0660;
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}
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static void clean_up_cur_rule(void)
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{
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struct envmatch *e;
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free(G.cur_rule.envvar);
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free(G.cur_rule.ren_mov);
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if (G.cur_rule.regex_compiled)
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regfree(&G.cur_rule.match);
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IF_FEATURE_MDEV_EXEC(free(G.cur_rule.r_cmd);)
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e = G.cur_rule.envmatch;
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while (e) {
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free(e->envname);
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regfree(&e->match);
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e = e->next;
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}
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make_default_cur_rule();
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}
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static char *parse_envmatch_pfx(char *val)
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{
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struct envmatch **nextp = &G.cur_rule.envmatch;
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for (;;) {
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struct envmatch *e;
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char *semicolon;
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char *eq = strchr(val, '=');
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if (!eq /* || eq == val? */)
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return val;
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if (endofname(val) != eq)
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return val;
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semicolon = strchr(eq, ';');
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if (!semicolon)
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return val;
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/* ENVVAR=regex;... */
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*nextp = e = xzalloc(sizeof(*e));
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nextp = &e->next;
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e->envname = xstrndup(val, eq - val);
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*semicolon = '\0';
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xregcomp(&e->match, eq + 1, REG_EXTENDED);
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*semicolon = ';';
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val = semicolon + 1;
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}
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}
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static void parse_next_rule(void)
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{
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/* Note: on entry, G.cur_rule is set to default */
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while (1) {
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char *tokens[4];
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char *val;
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/* No PARSE_EOL_COMMENTS, because command may contain '#' chars */
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if (!config_read(G.parser, tokens, 4, 3, "# \t", PARSE_NORMAL & ~PARSE_EOL_COMMENTS))
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break;
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/* Fields: [-]regex uid:gid mode [alias] [cmd] */
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dbg3("token1:'%s'", tokens[1]);
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/* 1st field */
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val = tokens[0];
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G.cur_rule.keep_matching = ('-' == val[0]);
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val += G.cur_rule.keep_matching; /* swallow leading dash */
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val = parse_envmatch_pfx(val);
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if (val[0] == '@') {
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/* @major,minor[-minor2] */
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/* (useful when name is ambiguous:
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* "/sys/class/usb/lp0" and
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* "/sys/class/printer/lp0")
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*/
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int sc = sscanf(val, "@%u,%u-%u", &G.cur_rule.maj, &G.cur_rule.min0, &G.cur_rule.min1);
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if (sc < 2 || G.cur_rule.maj < 0) {
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bb_error_msg("bad @maj,min on line %d", G.parser->lineno);
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goto next_rule;
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}
|
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if (sc == 2)
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G.cur_rule.min1 = G.cur_rule.min0;
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} else {
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char *eq = strchr(val, '=');
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if (val[0] == '$') {
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/* $ENVVAR=regex ... */
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val++;
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if (!eq) {
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bb_error_msg("bad $envvar=regex on line %d", G.parser->lineno);
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goto next_rule;
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}
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G.cur_rule.envvar = xstrndup(val, eq - val);
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val = eq + 1;
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}
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xregcomp(&G.cur_rule.match, val, REG_EXTENDED);
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G.cur_rule.regex_compiled = 1;
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}
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|
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/* 2nd field: uid:gid - device ownership */
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if (get_uidgid(&G.cur_rule.ugid, tokens[1], /*allow_numeric:*/ 1) == 0) {
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bb_error_msg("unknown user/group '%s' on line %d", tokens[1], G.parser->lineno);
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goto next_rule;
|
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}
|
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|
|
/* 3rd field: mode - device permissions */
|
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bb_parse_mode(tokens[2], &G.cur_rule.mode);
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|
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/* 4th field (opt): ">|=alias" or "!" to not create the node */
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|
val = tokens[3];
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if (ENABLE_FEATURE_MDEV_RENAME && val && strchr(">=!", val[0])) {
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char *s = skip_non_whitespace(val);
|
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G.cur_rule.ren_mov = xstrndup(val, s - val);
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val = skip_whitespace(s);
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}
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|
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if (ENABLE_FEATURE_MDEV_EXEC && val && val[0]) {
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const char *s = "$@*";
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const char *s2 = strchr(s, val[0]);
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if (!s2) {
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bb_error_msg("bad line %u", G.parser->lineno);
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goto next_rule;
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}
|
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IF_FEATURE_MDEV_EXEC(G.cur_rule.r_cmd = xstrdup(val);)
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}
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return;
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next_rule:
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clean_up_cur_rule();
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} /* while (config_read) */
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|
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dbg3("config_close(G.parser)");
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config_close(G.parser);
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G.parser = NULL;
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return;
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}
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|
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/* If mdev -s, we remember rules in G.rule_vec[].
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* Otherwise, there is no point in doing it, and we just
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* save only one parsed rule in G.cur_rule.
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*/
|
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static const struct rule *next_rule(void)
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{
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struct rule *rule;
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|
|
|
/* Open conf file if we didn't do it yet */
|
|
if (!G.parser && G.filename) {
|
|
dbg3("config_open('%s')", G.filename);
|
|
G.parser = config_open2(G.filename, fopen_for_read);
|
|
G.filename = NULL;
|
|
}
|
|
|
|
if (G.rule_vec) {
|
|
/* mdev -s */
|
|
/* Do we have rule parsed already? */
|
|
if (G.rule_vec[G.rule_idx]) {
|
|
dbg3("< G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
|
|
return G.rule_vec[G.rule_idx++];
|
|
}
|
|
make_default_cur_rule();
|
|
} else {
|
|
/* not mdev -s */
|
|
clean_up_cur_rule();
|
|
}
|
|
|
|
/* Parse one more rule if file isn't fully read */
|
|
rule = &G.cur_rule;
|
|
if (G.parser) {
|
|
parse_next_rule();
|
|
if (G.rule_vec) { /* mdev -s */
|
|
rule = memcpy(xmalloc(sizeof(G.cur_rule)), &G.cur_rule, sizeof(G.cur_rule));
|
|
G.rule_vec = xrealloc_vector(G.rule_vec, 4, G.rule_idx);
|
|
G.rule_vec[G.rule_idx++] = rule;
|
|
dbg3("> G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
|
|
}
|
|
}
|
|
|
|
return rule;
|
|
}
|
|
|
|
static int env_matches(struct envmatch *e)
|
|
{
|
|
while (e) {
|
|
int r;
|
|
char *val = getenv(e->envname);
|
|
if (!val)
|
|
return 0;
|
|
r = regexec(&e->match, val, /*size*/ 0, /*range[]*/ NULL, /*eflags*/ 0);
|
|
if (r != 0) /* no match */
|
|
return 0;
|
|
e = e->next;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#else
|
|
|
|
# define next_rule() (&G.cur_rule)
|
|
|
|
#endif
|
|
|
|
static void mkdir_recursive(char *name)
|
|
{
|
|
/* if name has many levels ("dir1/dir2"),
|
|
* bb_make_directory() will create dir1 according to umask,
|
|
* not according to its "mode" parameter.
|
|
* Since we run with umask=0, need to temporarily switch it.
|
|
*/
|
|
umask(022); /* "dir1" (if any) will be 0755 too */
|
|
bb_make_directory(name, 0755, FILEUTILS_RECUR);
|
|
umask(0);
|
|
}
|
|
|
|
/* Builds an alias path.
|
|
* This function potentionally reallocates the alias parameter.
|
|
* Only used for ENABLE_FEATURE_MDEV_RENAME
|
|
*/
|
|
static char *build_alias(char *alias, const char *device_name)
|
|
{
|
|
char *dest;
|
|
|
|
/* ">bar/": rename to bar/device_name */
|
|
/* ">bar[/]baz": rename to bar[/]baz */
|
|
dest = strrchr(alias, '/');
|
|
if (dest) { /* ">bar/[baz]" ? */
|
|
*dest = '\0'; /* mkdir bar */
|
|
mkdir_recursive(alias);
|
|
*dest = '/';
|
|
if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
|
|
dest = alias;
|
|
alias = concat_path_file(alias, device_name);
|
|
free(dest);
|
|
}
|
|
}
|
|
|
|
return alias;
|
|
}
|
|
|
|
/* mknod in /dev based on a path like "/sys/block/hda/hda1"
|
|
* NB1: path parameter needs to have SCRATCH_SIZE scratch bytes
|
|
* after NUL, but we promise to not mangle (IOW: to restore NUL if needed)
|
|
* path string.
|
|
* NB2: "mdev -s" may call us many times, do not leak memory/fds!
|
|
*
|
|
* device_name = $DEVNAME (may be NULL)
|
|
* path = /sys/$DEVPATH
|
|
*/
|
|
static void make_device(char *device_name, char *path, int operation)
|
|
{
|
|
int major, minor, type, len;
|
|
char *path_end = path + strlen(path);
|
|
|
|
/* Try to read major/minor string. Note that the kernel puts \n after
|
|
* the data, so we don't need to worry about null terminating the string
|
|
* because sscanf() will stop at the first nondigit, which \n is.
|
|
* We also depend on path having writeable space after it.
|
|
*/
|
|
major = -1;
|
|
if (operation == OP_add) {
|
|
strcpy(path_end, "/dev");
|
|
len = open_read_close(path, path_end + 1, SCRATCH_SIZE - 1);
|
|
*path_end = '\0';
|
|
if (len < 1) {
|
|
if (!ENABLE_FEATURE_MDEV_EXEC)
|
|
return;
|
|
/* no "dev" file, but we can still run scripts
|
|
* based on device name */
|
|
} else if (sscanf(path_end + 1, "%u:%u", &major, &minor) == 2) {
|
|
dbg1("dev %u,%u", major, minor);
|
|
} else {
|
|
major = -1;
|
|
}
|
|
}
|
|
/* else: for delete, -1 still deletes the node, but < -1 suppresses that */
|
|
|
|
/* Determine device name */
|
|
if (!device_name) {
|
|
/*
|
|
* There was no $DEVNAME envvar (for example, mdev -s never has).
|
|
* But it is very useful: it contains the *path*, not only basename,
|
|
* Thankfully, uevent file has it.
|
|
* Example of .../sound/card0/controlC0/uevent file on Linux-3.7.7:
|
|
* MAJOR=116
|
|
* MINOR=7
|
|
* DEVNAME=snd/controlC0
|
|
*/
|
|
strcpy(path_end, "/uevent");
|
|
len = open_read_close(path, path_end + 1, SCRATCH_SIZE - 1);
|
|
if (len < 0)
|
|
len = 0;
|
|
*path_end = '\0';
|
|
path_end[1 + len] = '\0';
|
|
device_name = strstr(path_end + 1, "\nDEVNAME=");
|
|
if (device_name) {
|
|
device_name += sizeof("\nDEVNAME=")-1;
|
|
strchrnul(device_name, '\n')[0] = '\0';
|
|
} else {
|
|
/* Fall back to just basename */
|
|
device_name = (char*) bb_basename(path);
|
|
}
|
|
}
|
|
/* Determine device type */
|
|
/*
|
|
* http://kernel.org/doc/pending/hotplug.txt says that only
|
|
* "/sys/block/..." is for block devices. "/sys/bus" etc is not.
|
|
* But since 2.6.25 block devices are also in /sys/class/block.
|
|
* We use strstr("/block/") to forestall future surprises.
|
|
*/
|
|
type = S_IFCHR;
|
|
if (strstr(path, "/block/") || (G.subsystem && is_prefixed_with(G.subsystem, "block")))
|
|
type = S_IFBLK;
|
|
|
|
#if ENABLE_FEATURE_MDEV_CONF
|
|
G.rule_idx = 0; /* restart from the beginning (think mdev -s) */
|
|
#endif
|
|
for (;;) {
|
|
const char *str_to_match;
|
|
regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
|
|
char *command;
|
|
char *alias;
|
|
char aliaslink = aliaslink; /* for compiler */
|
|
char *node_name;
|
|
const struct rule *rule;
|
|
|
|
str_to_match = device_name;
|
|
|
|
rule = next_rule();
|
|
|
|
#if ENABLE_FEATURE_MDEV_CONF
|
|
if (!env_matches(rule->envmatch))
|
|
continue;
|
|
if (rule->maj >= 0) { /* @maj,min rule */
|
|
if (major != rule->maj)
|
|
continue;
|
|
if (minor < rule->min0 || minor > rule->min1)
|
|
continue;
|
|
memset(off, 0, sizeof(off));
|
|
goto rule_matches;
|
|
}
|
|
if (rule->envvar) { /* $envvar=regex rule */
|
|
str_to_match = getenv(rule->envvar);
|
|
dbg3("getenv('%s'):'%s'", rule->envvar, str_to_match);
|
|
if (!str_to_match)
|
|
continue;
|
|
}
|
|
/* else: str_to_match = device_name */
|
|
|
|
if (rule->regex_compiled) {
|
|
int regex_match = regexec(&rule->match, str_to_match, ARRAY_SIZE(off), off, 0);
|
|
dbg3("regex_match for '%s':%d", str_to_match, regex_match);
|
|
//bb_error_msg("matches:");
|
|
//for (int i = 0; i < ARRAY_SIZE(off); i++) {
|
|
// if (off[i].rm_so < 0) continue;
|
|
// bb_error_msg("match %d: '%.*s'\n", i,
|
|
// (int)(off[i].rm_eo - off[i].rm_so),
|
|
// device_name + off[i].rm_so);
|
|
//}
|
|
|
|
if (regex_match != 0
|
|
/* regexec returns whole pattern as "range" 0 */
|
|
|| off[0].rm_so != 0
|
|
|| (int)off[0].rm_eo != (int)strlen(str_to_match)
|
|
) {
|
|
continue; /* this rule doesn't match */
|
|
}
|
|
}
|
|
/* else: it's final implicit "match-all" rule */
|
|
rule_matches:
|
|
dbg2("rule matched, line %d", G.parser ? G.parser->lineno : -1);
|
|
#endif
|
|
/* Build alias name */
|
|
alias = NULL;
|
|
if (ENABLE_FEATURE_MDEV_RENAME && rule->ren_mov) {
|
|
aliaslink = rule->ren_mov[0];
|
|
if (aliaslink == '!') {
|
|
/* "!": suppress node creation/deletion */
|
|
major = -2;
|
|
}
|
|
else if (aliaslink == '>' || aliaslink == '=') {
|
|
if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
|
|
char *s;
|
|
char *p;
|
|
unsigned n;
|
|
|
|
/* substitute %1..9 with off[1..9], if any */
|
|
n = 0;
|
|
s = rule->ren_mov;
|
|
while (*s)
|
|
if (*s++ == '%')
|
|
n++;
|
|
|
|
p = alias = xzalloc(strlen(rule->ren_mov) + n * strlen(str_to_match));
|
|
s = rule->ren_mov + 1;
|
|
while (*s) {
|
|
*p = *s;
|
|
if ('%' == *s) {
|
|
unsigned i = (s[1] - '0');
|
|
if (i <= 9 && off[i].rm_so >= 0) {
|
|
n = off[i].rm_eo - off[i].rm_so;
|
|
strncpy(p, str_to_match + off[i].rm_so, n);
|
|
p += n - 1;
|
|
s++;
|
|
}
|
|
}
|
|
p++;
|
|
s++;
|
|
}
|
|
} else {
|
|
alias = xstrdup(rule->ren_mov + 1);
|
|
}
|
|
}
|
|
}
|
|
dbg3("alias:'%s'", alias);
|
|
|
|
command = NULL;
|
|
IF_FEATURE_MDEV_EXEC(command = rule->r_cmd;)
|
|
if (command) {
|
|
/* Are we running this command now?
|
|
* Run @cmd on create, $cmd on delete, *cmd on any
|
|
*/
|
|
if ((command[0] == '@' && operation == OP_add)
|
|
|| (command[0] == '$' && operation == OP_remove)
|
|
|| (command[0] == '*')
|
|
) {
|
|
command++;
|
|
} else {
|
|
command = NULL;
|
|
}
|
|
}
|
|
dbg3("command:'%s'", command);
|
|
|
|
/* "Execute" the line we found */
|
|
node_name = device_name;
|
|
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
|
node_name = alias = build_alias(alias, device_name);
|
|
dbg3("alias2:'%s'", alias);
|
|
}
|
|
|
|
if (operation == OP_add && major >= 0) {
|
|
char *slash = strrchr(node_name, '/');
|
|
if (slash) {
|
|
*slash = '\0';
|
|
mkdir_recursive(node_name);
|
|
*slash = '/';
|
|
}
|
|
if (ENABLE_FEATURE_MDEV_CONF) {
|
|
dbg1("mknod %s (%d,%d) %o"
|
|
" %u:%u",
|
|
node_name, major, minor, rule->mode | type,
|
|
rule->ugid.uid, rule->ugid.gid
|
|
);
|
|
} else {
|
|
dbg1("mknod %s (%d,%d) %o",
|
|
node_name, major, minor, rule->mode | type
|
|
);
|
|
}
|
|
if (mknod(node_name, rule->mode | type, makedev(major, minor)) && errno != EEXIST)
|
|
bb_perror_msg("can't create '%s'", node_name);
|
|
if (ENABLE_FEATURE_MDEV_CONF) {
|
|
chmod(node_name, rule->mode);
|
|
chown(node_name, rule->ugid.uid, rule->ugid.gid);
|
|
}
|
|
if (major == G.root_major && minor == G.root_minor)
|
|
symlink(node_name, "root");
|
|
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
|
if (aliaslink == '>') {
|
|
//TODO: on devtmpfs, device_name already exists and symlink() fails.
|
|
//End result is that instead of symlink, we have two nodes.
|
|
//What should be done?
|
|
dbg1("symlink: %s", device_name);
|
|
symlink(node_name, device_name);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ENABLE_FEATURE_MDEV_EXEC && command) {
|
|
/* setenv will leak memory, use putenv/unsetenv/free */
|
|
char *s = xasprintf("%s=%s", "MDEV", node_name);
|
|
putenv(s);
|
|
dbg1("running: %s", command);
|
|
if (system(command) == -1)
|
|
bb_perror_msg("can't run '%s'", command);
|
|
bb_unsetenv_and_free(s);
|
|
}
|
|
|
|
if (operation == OP_remove && major >= -1) {
|
|
if (ENABLE_FEATURE_MDEV_RENAME && alias) {
|
|
if (aliaslink == '>') {
|
|
dbg1("unlink: %s", device_name);
|
|
unlink(device_name);
|
|
}
|
|
}
|
|
dbg1("unlink: %s", node_name);
|
|
unlink(node_name);
|
|
}
|
|
|
|
if (ENABLE_FEATURE_MDEV_RENAME)
|
|
free(alias);
|
|
|
|
/* We found matching line.
|
|
* Stop unless it was prefixed with '-'
|
|
*/
|
|
if (!ENABLE_FEATURE_MDEV_CONF || !rule->keep_matching)
|
|
break;
|
|
} /* for (;;) */
|
|
}
|
|
|
|
/* File callback for /sys/ traversal */
|
|
static int FAST_FUNC fileAction(const char *fileName,
|
|
struct stat *statbuf UNUSED_PARAM,
|
|
void *userData,
|
|
int depth UNUSED_PARAM)
|
|
{
|
|
size_t len = strlen(fileName) - 4; /* can't underflow */
|
|
char *scratch = userData;
|
|
|
|
/* len check is for paranoid reasons */
|
|
if (strcmp(fileName + len, "/dev") != 0 || len >= PATH_MAX)
|
|
return FALSE;
|
|
|
|
strcpy(scratch, fileName);
|
|
scratch[len] = '\0';
|
|
make_device(/*DEVNAME:*/ NULL, scratch, OP_add);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Directory callback for /sys/ traversal */
|
|
static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
|
|
struct stat *statbuf UNUSED_PARAM,
|
|
void *userData UNUSED_PARAM,
|
|
int depth)
|
|
{
|
|
/* Extract device subsystem -- the name of the directory
|
|
* under /sys/class/ */
|
|
if (1 == depth) {
|
|
free(G.subsystem);
|
|
if (G.subsys_env) {
|
|
bb_unsetenv_and_free(G.subsys_env);
|
|
G.subsys_env = NULL;
|
|
}
|
|
G.subsystem = strrchr(fileName, '/');
|
|
if (G.subsystem) {
|
|
G.subsystem = xstrdup(G.subsystem + 1);
|
|
G.subsys_env = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
|
|
putenv(G.subsys_env);
|
|
}
|
|
}
|
|
|
|
return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
|
|
}
|
|
|
|
/* For the full gory details, see linux/Documentation/firmware_class/README
|
|
*
|
|
* Firmware loading works like this:
|
|
* - kernel sets FIRMWARE env var
|
|
* - userspace checks /lib/firmware/$FIRMWARE
|
|
* - userspace waits for /sys/$DEVPATH/loading to appear
|
|
* - userspace writes "1" to /sys/$DEVPATH/loading
|
|
* - userspace copies /lib/firmware/$FIRMWARE into /sys/$DEVPATH/data
|
|
* - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading
|
|
* - kernel loads firmware into device
|
|
*/
|
|
static void load_firmware(const char *firmware, const char *sysfs_path)
|
|
{
|
|
int cnt;
|
|
int firmware_fd, loading_fd;
|
|
|
|
/* check for /lib/firmware/$FIRMWARE */
|
|
xchdir("/lib/firmware");
|
|
firmware_fd = open(firmware, O_RDONLY); /* can fail */
|
|
|
|
/* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */
|
|
xchdir(sysfs_path);
|
|
for (cnt = 0; cnt < 30; ++cnt) {
|
|
loading_fd = open("loading", O_WRONLY);
|
|
if (loading_fd >= 0)
|
|
goto loading;
|
|
sleep(1);
|
|
}
|
|
goto out;
|
|
|
|
loading:
|
|
cnt = 0;
|
|
if (firmware_fd >= 0) {
|
|
int data_fd;
|
|
|
|
/* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
|
|
if (full_write(loading_fd, "1", 1) != 1)
|
|
goto out;
|
|
|
|
/* load firmware into /sys/$DEVPATH/data */
|
|
data_fd = open("data", O_WRONLY);
|
|
if (data_fd < 0)
|
|
goto out;
|
|
cnt = bb_copyfd_eof(firmware_fd, data_fd);
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
close(data_fd);
|
|
}
|
|
|
|
/* Tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading"
|
|
* Note: we emit -1 also if firmware file wasn't found.
|
|
* There are cases when otherwise kernel would wait for minutes
|
|
* before timing out.
|
|
*/
|
|
if (cnt > 0)
|
|
full_write(loading_fd, "0", 1);
|
|
else
|
|
full_write(loading_fd, "-1", 2);
|
|
|
|
out:
|
|
xchdir("/dev");
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
close(firmware_fd);
|
|
close(loading_fd);
|
|
}
|
|
}
|
|
|
|
static char *curtime(void)
|
|
{
|
|
struct timeval tv;
|
|
gettimeofday(&tv, NULL);
|
|
sprintf(
|
|
strftime_HHMMSS(G.timestr, sizeof(G.timestr), &tv.tv_sec),
|
|
".%06u",
|
|
(unsigned)tv.tv_usec
|
|
);
|
|
return G.timestr;
|
|
}
|
|
|
|
static void open_mdev_log(const char *seq, unsigned my_pid)
|
|
{
|
|
int logfd = open("mdev.log", O_WRONLY | O_APPEND);
|
|
if (logfd >= 0) {
|
|
xmove_fd(logfd, STDERR_FILENO);
|
|
G.verbose = 2;
|
|
applet_name = xasprintf("%s[%s]", applet_name, seq ? seq : utoa(my_pid));
|
|
}
|
|
}
|
|
|
|
/* If it exists, does /dev/mdev.seq match $SEQNUM?
|
|
* If it does not match, earlier mdev is running
|
|
* in parallel, and we need to wait.
|
|
* Active mdev pokes us with SIGCHLD to check the new file.
|
|
*/
|
|
static int
|
|
wait_for_seqfile(unsigned expected_seq)
|
|
{
|
|
/* We time out after 2 sec */
|
|
static const struct timespec ts = { 0, 32*1000*1000 };
|
|
int timeout = 2000 / 32;
|
|
int seq_fd = -1;
|
|
int do_once = 1;
|
|
sigset_t set_CHLD;
|
|
|
|
sigemptyset(&set_CHLD);
|
|
sigaddset(&set_CHLD, SIGCHLD);
|
|
sigprocmask(SIG_BLOCK, &set_CHLD, NULL);
|
|
|
|
for (;;) {
|
|
int seqlen;
|
|
char seqbuf[sizeof(long)*3 + 2];
|
|
unsigned seqbufnum;
|
|
|
|
if (seq_fd < 0) {
|
|
seq_fd = open("mdev.seq", O_RDWR);
|
|
if (seq_fd < 0)
|
|
break;
|
|
close_on_exec_on(seq_fd);
|
|
}
|
|
seqlen = pread(seq_fd, seqbuf, sizeof(seqbuf) - 1, 0);
|
|
if (seqlen < 0) {
|
|
close(seq_fd);
|
|
seq_fd = -1;
|
|
break;
|
|
}
|
|
seqbuf[seqlen] = '\0';
|
|
if (seqbuf[0] == '\n' || seqbuf[0] == '\0') {
|
|
/* seed file: write out seq ASAP */
|
|
xwrite_str(seq_fd, utoa(expected_seq));
|
|
xlseek(seq_fd, 0, SEEK_SET);
|
|
dbg2("first seq written");
|
|
break;
|
|
}
|
|
seqbufnum = atoll(seqbuf);
|
|
if (seqbufnum == expected_seq) {
|
|
/* correct idx */
|
|
break;
|
|
}
|
|
if (seqbufnum > expected_seq) {
|
|
/* a later mdev runs already (this was seen by users to happen) */
|
|
/* do not overwrite seqfile on exit */
|
|
close(seq_fd);
|
|
seq_fd = -1;
|
|
break;
|
|
}
|
|
if (do_once) {
|
|
dbg2("%s mdev.seq='%s', need '%u'", curtime(), seqbuf, expected_seq);
|
|
do_once = 0;
|
|
}
|
|
if (sigtimedwait(&set_CHLD, NULL, &ts) >= 0) {
|
|
dbg3("woken up");
|
|
continue; /* don't decrement timeout! */
|
|
}
|
|
if (--timeout == 0) {
|
|
dbg1("%s mdev.seq='%s'", "timed out", seqbuf);
|
|
break;
|
|
}
|
|
}
|
|
sigprocmask(SIG_UNBLOCK, &set_CHLD, NULL);
|
|
return seq_fd;
|
|
}
|
|
|
|
static void signal_mdevs(unsigned my_pid)
|
|
{
|
|
procps_status_t* p = NULL;
|
|
while ((p = procps_scan(p, PSSCAN_ARGV0)) != NULL) {
|
|
if (p->pid != my_pid
|
|
&& p->argv0
|
|
&& strcmp(bb_basename(p->argv0), "mdev") == 0
|
|
) {
|
|
kill(p->pid, SIGCHLD);
|
|
}
|
|
}
|
|
}
|
|
|
|
int mdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int mdev_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
|
|
|
|
INIT_G();
|
|
|
|
#if ENABLE_FEATURE_MDEV_CONF
|
|
G.filename = "/etc/mdev.conf";
|
|
#endif
|
|
|
|
/* We can be called as hotplug helper */
|
|
/* Kernel cannot provide suitable stdio fds for us, do it ourself */
|
|
bb_sanitize_stdio();
|
|
|
|
/* Force the configuration file settings exactly */
|
|
umask(0);
|
|
|
|
xchdir("/dev");
|
|
|
|
if (argv[1] && strcmp(argv[1], "-s") == 0) {
|
|
/*
|
|
* Scan: mdev -s
|
|
*/
|
|
struct stat st;
|
|
|
|
#if ENABLE_FEATURE_MDEV_CONF
|
|
/* Same as xrealloc_vector(NULL, 4, 0): */
|
|
G.rule_vec = xzalloc((1 << 4) * sizeof(*G.rule_vec));
|
|
#endif
|
|
xstat("/", &st);
|
|
G.root_major = major(st.st_dev);
|
|
G.root_minor = minor(st.st_dev);
|
|
|
|
putenv((char*)"ACTION=add");
|
|
|
|
/* ACTION_FOLLOWLINKS is needed since in newer kernels
|
|
* /sys/block/loop* (for example) are symlinks to dirs,
|
|
* not real directories.
|
|
* (kernel's CONFIG_SYSFS_DEPRECATED makes them real dirs,
|
|
* but we can't enforce that on users)
|
|
*/
|
|
if (access("/sys/class/block", F_OK) != 0) {
|
|
/* Scan obsolete /sys/block only if /sys/class/block
|
|
* doesn't exist. Otherwise we'll have dupes.
|
|
* Also, do not complain if it doesn't exist.
|
|
* Some people configure kernel to have no blockdevs.
|
|
*/
|
|
recursive_action("/sys/block",
|
|
ACTION_RECURSE | ACTION_FOLLOWLINKS | ACTION_QUIET,
|
|
fileAction, dirAction, temp, 0);
|
|
}
|
|
recursive_action("/sys/class",
|
|
ACTION_RECURSE | ACTION_FOLLOWLINKS,
|
|
fileAction, dirAction, temp, 0);
|
|
} else {
|
|
char *fw;
|
|
char *seq;
|
|
char *action;
|
|
char *env_devname;
|
|
char *env_devpath;
|
|
unsigned my_pid;
|
|
unsigned seqnum = seqnum; /* for compiler */
|
|
int seq_fd;
|
|
smalluint op;
|
|
|
|
/* Hotplug:
|
|
* env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
|
|
* ACTION can be "add", "remove", "change"
|
|
* DEVPATH is like "/block/sda" or "/class/input/mice"
|
|
*/
|
|
env_devname = getenv("DEVNAME"); /* can be NULL */
|
|
G.subsystem = getenv("SUBSYSTEM");
|
|
action = getenv("ACTION");
|
|
env_devpath = getenv("DEVPATH");
|
|
if (!action || !env_devpath /*|| !G.subsystem*/)
|
|
bb_show_usage();
|
|
fw = getenv("FIRMWARE");
|
|
seq = getenv("SEQNUM");
|
|
op = index_in_strings(keywords, action);
|
|
|
|
my_pid = getpid();
|
|
open_mdev_log(seq, my_pid);
|
|
|
|
seq_fd = -1;
|
|
if (seq) {
|
|
seqnum = atoll(seq);
|
|
seq_fd = wait_for_seqfile(seqnum);
|
|
}
|
|
|
|
dbg1("%s "
|
|
"ACTION:%s SUBSYSTEM:%s DEVNAME:%s DEVPATH:%s"
|
|
"%s%s",
|
|
curtime(),
|
|
action, G.subsystem, env_devname, env_devpath,
|
|
fw ? " FW:" : "", fw ? fw : ""
|
|
);
|
|
|
|
snprintf(temp, PATH_MAX, "/sys%s", env_devpath);
|
|
if (op == OP_remove) {
|
|
/* Ignoring "remove firmware". It was reported
|
|
* to happen and to cause erroneous deletion
|
|
* of device nodes. */
|
|
if (!fw)
|
|
make_device(env_devname, temp, op);
|
|
}
|
|
else {
|
|
make_device(env_devname, temp, op);
|
|
if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
|
|
if (op == OP_add && fw)
|
|
load_firmware(fw, temp);
|
|
}
|
|
}
|
|
|
|
dbg1("%s exiting", curtime());
|
|
if (seq_fd >= 0) {
|
|
xwrite_str(seq_fd, utoa(seqnum + 1));
|
|
signal_mdevs(my_pid);
|
|
}
|
|
}
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
RELEASE_CONFIG_BUFFER(temp);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|