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https://github.com/sheumann/hush.git
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This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
619 lines
17 KiB
C
619 lines
17 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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#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 $FIRMWARE)
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*
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* If /etc/mdev.conf exists, it may modify /dev/device_name's properties.
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* /etc/mdev.conf file format:
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*
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* [-][subsystem/]device user:grp mode [>|=path] [@|$|*command args...]
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* [-]@maj,min[-min2] user:grp mode [>|=path] [@|$|*command args...]
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* [-]$envvar=val user:grp mode [>|=path] [@|$|*command args...]
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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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* The device name or "subsystem/device" combo is matched against 1st field
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* (which is a regex), or maj,min is matched against 1st field,
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* or specified environment variable (as regex) is matched against 1st field.
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*
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* $envvar=val 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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struct globals {
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int root_major, root_minor;
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char *subsystem;
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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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 64+ bytes in make_device() */
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#define SCRATCH_SIZE 80
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/* Builds an alias path.
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* This function potentionally reallocates the alias parameter.
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* Only used for ENABLE_FEATURE_MDEV_RENAME
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*/
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static char *build_alias(char *alias, const char *device_name)
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{
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char *dest;
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/* ">bar/": rename to bar/device_name */
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/* ">bar[/]baz": rename to bar[/]baz */
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dest = strrchr(alias, '/');
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if (dest) { /* ">bar/[baz]" ? */
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*dest = '\0'; /* mkdir bar */
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bb_make_directory(alias, 0755, FILEUTILS_RECUR);
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*dest = '/';
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if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
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dest = alias;
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alias = concat_path_file(alias, device_name);
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free(dest);
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}
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}
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return alias;
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}
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/* mknod in /dev based on a path like "/sys/block/hda/hda1"
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* NB1: path parameter needs to have SCRATCH_SIZE scratch bytes
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* after NUL, but we promise to not mangle (IOW: to restore if needed)
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* path string.
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* NB2: "mdev -s" may call us many times, do not leak memory/fds!
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*/
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static void make_device(char *path, int delete)
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{
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char *device_name, *subsystem_slash_devname;
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int major, minor, type, len;
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mode_t mode;
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parser_t *parser;
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/* Try to read major/minor string. Note that the kernel puts \n after
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* the data, so we don't need to worry about null terminating the string
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* because sscanf() will stop at the first nondigit, which \n is.
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* We also depend on path having writeable space after it.
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*/
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major = -1;
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if (!delete) {
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char *dev_maj_min = path + strlen(path);
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strcpy(dev_maj_min, "/dev");
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len = open_read_close(path, dev_maj_min + 1, 64);
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*dev_maj_min = '\0';
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if (len < 1) {
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if (!ENABLE_FEATURE_MDEV_EXEC)
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return;
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/* no "dev" file, but we can still run scripts
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* based on device name */
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} else if (sscanf(++dev_maj_min, "%u:%u", &major, &minor) != 2) {
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major = -1;
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}
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}
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/* else: for delete, -1 still deletes the node, but < -1 suppresses that */
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/* Determine device name, type, major and minor */
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device_name = (char*) bb_basename(path);
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/* http://kernel.org/doc/pending/hotplug.txt says that only
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* "/sys/block/..." is for block devices. "/sys/bus" etc is not.
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* But since 2.6.25 block devices are also in /sys/class/block.
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* We use strstr("/block/") to forestall future surprises. */
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type = S_IFCHR;
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if (strstr(path, "/block/") || (G.subsystem && strncmp(G.subsystem, "block", 5) == 0))
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type = S_IFBLK;
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/* Make path point to "subsystem/device_name" */
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subsystem_slash_devname = NULL;
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/* Check for coldplug invocations first */
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if (strncmp(path, "/sys/block/", 11) == 0) /* legacy case */
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path += sizeof("/sys/") - 1;
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else if (strncmp(path, "/sys/class/", 11) == 0)
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path += sizeof("/sys/class/") - 1;
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else {
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/* Example of a hotplug invocation:
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* SUBSYSTEM="block"
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* DEVPATH="/sys" + "/devices/virtual/mtd/mtd3/mtdblock3"
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* ("/sys" is added by mdev_main)
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* - path does not contain subsystem
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*/
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subsystem_slash_devname = concat_path_file(G.subsystem, device_name);
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path = subsystem_slash_devname;
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}
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/* If we have config file, look up user settings */
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if (ENABLE_FEATURE_MDEV_CONF)
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parser = config_open2("/etc/mdev.conf", fopen_for_read);
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do {
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int keep_matching;
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struct bb_uidgid_t ugid;
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char *tokens[4];
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char *command = NULL;
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char *alias = NULL;
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char aliaslink = aliaslink; /* for compiler */
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/* Defaults in case we won't match any line */
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ugid.uid = ugid.gid = 0;
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keep_matching = 0;
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mode = 0660;
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if (ENABLE_FEATURE_MDEV_CONF
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&& config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)
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) {
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char *val;
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char *str_to_match;
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regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
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val = tokens[0];
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keep_matching = ('-' == val[0]);
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val += keep_matching; /* swallow leading dash */
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/* Match against either "subsystem/device_name"
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* or "device_name" alone */
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str_to_match = strchr(val, '/') ? path : device_name;
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/* Fields: regex uid:gid mode [alias] [cmd] */
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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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int cmaj, cmin0, cmin1, sc;
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if (major < 0)
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continue; /* no dev, no match */
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sc = sscanf(val, "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
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if (sc < 1
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|| major != cmaj
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|| (sc == 2 && minor != cmin0)
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|| (sc == 3 && (minor < cmin0 || minor > cmin1))
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) {
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continue; /* this line doesn't match */
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}
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goto line_matches;
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}
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if (val[0] == '$') {
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/* regex to match an environment variable */
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char *eq = strchr(++val, '=');
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if (!eq)
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continue;
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*eq = '\0';
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str_to_match = getenv(val);
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if (!str_to_match)
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continue;
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str_to_match -= strlen(val) + 1;
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*eq = '=';
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}
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/* else: regex to match [subsystem/]device_name */
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{
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regex_t match;
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int result;
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xregcomp(&match, val, REG_EXTENDED);
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result = regexec(&match, str_to_match, ARRAY_SIZE(off), off, 0);
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regfree(&match);
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//bb_error_msg("matches:");
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//for (int i = 0; i < ARRAY_SIZE(off); i++) {
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// if (off[i].rm_so < 0) continue;
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// bb_error_msg("match %d: '%.*s'\n", i,
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// (int)(off[i].rm_eo - off[i].rm_so),
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// device_name + off[i].rm_so);
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//}
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/* If no match, skip rest of line */
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/* (regexec returns whole pattern as "range" 0) */
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if (result
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|| off[0].rm_so
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|| ((int)off[0].rm_eo != (int)strlen(str_to_match))
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) {
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continue; /* this line doesn't match */
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}
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}
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line_matches:
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/* This line matches. Stop parsing after parsing
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* the rest the line unless keep_matching == 1 */
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/* 2nd field: uid:gid - device ownership */
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if (get_uidgid(&ugid, tokens[1], 1) == 0)
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bb_error_msg("unknown user/group %s on line %d", tokens[1], parser->lineno);
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/* 3rd field: mode - device permissions */
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bb_parse_mode(tokens[2], &mode);
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val = tokens[3];
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/* 4th field (opt): ">|=alias" or "!" to not create the node */
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if (ENABLE_FEATURE_MDEV_RENAME && val) {
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char *a, *s, *st;
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a = val;
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s = strchrnul(val, ' ');
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st = strchrnul(val, '\t');
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if (st < s)
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s = st;
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st = (s[0] && s[1]) ? s+1 : NULL;
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aliaslink = a[0];
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if (aliaslink == '!' && s == a+1) {
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val = st;
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/* "!": suppress node creation/deletion */
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major = -2;
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}
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else if (aliaslink == '>' || aliaslink == '=') {
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val = st;
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s[0] = '\0';
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if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
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char *p;
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unsigned i, n;
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/* substitute %1..9 with off[1..9], if any */
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n = 0;
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s = a;
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while (*s)
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if (*s++ == '%')
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n++;
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p = alias = xzalloc(strlen(a) + n * strlen(str_to_match));
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s = a + 1;
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while (*s) {
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*p = *s;
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if ('%' == *s) {
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i = (s[1] - '0');
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if (i <= 9 && off[i].rm_so >= 0) {
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n = off[i].rm_eo - off[i].rm_so;
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strncpy(p, str_to_match + off[i].rm_so, n);
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p += n - 1;
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s++;
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}
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}
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p++;
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s++;
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}
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} else {
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alias = xstrdup(a + 1);
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}
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}
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}
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if (ENABLE_FEATURE_MDEV_EXEC && val) {
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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", parser->lineno);
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if (ENABLE_FEATURE_MDEV_RENAME)
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free(alias);
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continue;
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}
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/* Are we running this command now?
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* Run $cmd on delete, @cmd on create, *cmd on both
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*/
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if (s2 - s != delete) {
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/* We are here if: '*',
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* or: '@' and delete = 0,
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* or: '$' and delete = 1
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*/
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command = xstrdup(val + 1);
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}
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}
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}
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/* End of field parsing */
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/* "Execute" the line we found */
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{
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const char *node_name;
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node_name = device_name;
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if (ENABLE_FEATURE_MDEV_RENAME && alias)
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node_name = alias = build_alias(alias, device_name);
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if (!delete && major >= 0) {
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if (mknod(node_name, mode | type, makedev(major, minor)) && errno != EEXIST)
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bb_perror_msg("can't create '%s'", node_name);
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if (major == G.root_major && minor == G.root_minor)
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symlink(node_name, "root");
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if (ENABLE_FEATURE_MDEV_CONF) {
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chmod(node_name, mode);
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chown(node_name, ugid.uid, ugid.gid);
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}
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if (ENABLE_FEATURE_MDEV_RENAME && alias) {
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if (aliaslink == '>')
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symlink(node_name, device_name);
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}
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}
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if (ENABLE_FEATURE_MDEV_EXEC && command) {
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/* setenv will leak memory, use putenv/unsetenv/free */
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char *s = xasprintf("%s=%s", "MDEV", node_name);
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char *s1 = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
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putenv(s);
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putenv(s1);
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if (system(command) == -1)
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bb_perror_msg("can't run '%s'", command);
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bb_unsetenv_and_free(s1);
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bb_unsetenv_and_free(s);
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free(command);
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}
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if (delete && major >= -1) {
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if (ENABLE_FEATURE_MDEV_RENAME && alias) {
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if (aliaslink == '>')
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unlink(device_name);
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}
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unlink(node_name);
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}
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if (ENABLE_FEATURE_MDEV_RENAME)
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free(alias);
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}
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/* We found matching line.
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* Stop unless it was prefixed with '-' */
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if (ENABLE_FEATURE_MDEV_CONF && !keep_matching)
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break;
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/* end of "while line is read from /etc/mdev.conf" */
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} while (ENABLE_FEATURE_MDEV_CONF);
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if (ENABLE_FEATURE_MDEV_CONF)
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config_close(parser);
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free(subsystem_slash_devname);
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}
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/* File callback for /sys/ traversal */
|
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static int FAST_FUNC fileAction(const char *fileName,
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struct stat *statbuf UNUSED_PARAM,
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void *userData,
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int depth UNUSED_PARAM)
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{
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size_t len = strlen(fileName) - 4; /* can't underflow */
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char *scratch = userData;
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|
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/* len check is for paranoid reasons */
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if (strcmp(fileName + len, "/dev") != 0 || len >= PATH_MAX)
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return FALSE;
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strcpy(scratch, fileName);
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scratch[len] = '\0';
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make_device(scratch, /*delete:*/ 0);
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return TRUE;
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}
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|
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/* Directory callback for /sys/ traversal */
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static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
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struct stat *statbuf UNUSED_PARAM,
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void *userData UNUSED_PARAM,
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int depth)
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{
|
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/* Extract device subsystem -- the name of the directory
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* under /sys/class/ */
|
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if (1 == depth) {
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free(G.subsystem);
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G.subsystem = strrchr(fileName, '/');
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if (G.subsystem)
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G.subsystem = xstrdup(G.subsystem + 1);
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}
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return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
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}
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/* For the full gory details, see linux/Documentation/firmware_class/README
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|
*
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* Firmware loading works like this:
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* - kernel sets FIRMWARE env var
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* - userspace checks /lib/firmware/$FIRMWARE
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* - userspace waits for /sys/$DEVPATH/loading to appear
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* - userspace writes "1" to /sys/$DEVPATH/loading
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* - userspace copies /lib/firmware/$FIRMWARE into /sys/$DEVPATH/data
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* - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading
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* - kernel loads firmware into device
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*/
|
|
static void load_firmware(const char *firmware, const char *sysfs_path)
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|
{
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|
int cnt;
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int firmware_fd, loading_fd, data_fd;
|
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|
|
/* check for /lib/firmware/$FIRMWARE */
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xchdir("/lib/firmware");
|
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firmware_fd = xopen(firmware, O_RDONLY);
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|
|
/* in case we goto out ... */
|
|
data_fd = -1;
|
|
|
|
/* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */
|
|
xchdir(sysfs_path);
|
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for (cnt = 0; cnt < 30; ++cnt) {
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loading_fd = open("loading", O_WRONLY);
|
|
if (loading_fd != -1)
|
|
goto loading;
|
|
sleep(1);
|
|
}
|
|
goto out;
|
|
|
|
loading:
|
|
/* 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 == -1)
|
|
goto out;
|
|
cnt = bb_copyfd_eof(firmware_fd, data_fd);
|
|
|
|
/* tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading" */
|
|
if (cnt > 0)
|
|
full_write(loading_fd, "0", 1);
|
|
else
|
|
full_write(loading_fd, "-1", 2);
|
|
|
|
out:
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
close(firmware_fd);
|
|
close(loading_fd);
|
|
close(data_fd);
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
/* 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;
|
|
|
|
xstat("/", &st);
|
|
G.root_major = major(st.st_dev);
|
|
G.root_minor = minor(st.st_dev);
|
|
|
|
/* 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_path;
|
|
static const char keywords[] ALIGN1 = "remove\0add\0";
|
|
enum { OP_remove = 0, OP_add };
|
|
smalluint op;
|
|
|
|
/* Hotplug:
|
|
* env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
|
|
* ACTION can be "add" or "remove"
|
|
* DEVPATH is like "/block/sda" or "/class/input/mice"
|
|
*/
|
|
action = getenv("ACTION");
|
|
env_path = getenv("DEVPATH");
|
|
G.subsystem = getenv("SUBSYSTEM");
|
|
if (!action || !env_path /*|| !G.subsystem*/)
|
|
bb_show_usage();
|
|
fw = getenv("FIRMWARE");
|
|
op = index_in_strings(keywords, action);
|
|
/* 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 */
|
|
seq = getenv("SEQNUM");
|
|
if (seq) {
|
|
int timeout = 2000 / 32; /* 2000 msec */
|
|
do {
|
|
int seqlen;
|
|
char seqbuf[sizeof(int)*3 + 2];
|
|
|
|
seqlen = open_read_close("mdev.seq", seqbuf, sizeof(seqbuf-1));
|
|
if (seqlen < 0) {
|
|
seq = NULL;
|
|
break;
|
|
}
|
|
seqbuf[seqlen] = '\0';
|
|
if (seqbuf[0] == '\n' /* seed file? */
|
|
|| strcmp(seq, seqbuf) == 0 /* correct idx? */
|
|
) {
|
|
break;
|
|
}
|
|
usleep(32*1000);
|
|
} while (--timeout);
|
|
}
|
|
|
|
snprintf(temp, PATH_MAX, "/sys%s", env_path);
|
|
if (op == OP_remove) {
|
|
/* Ignoring "remove firmware". It was reported
|
|
* to happen and to cause erroneous deletion
|
|
* of device nodes. */
|
|
if (!fw)
|
|
make_device(temp, /*delete:*/ 1);
|
|
}
|
|
else if (op == OP_add) {
|
|
make_device(temp, /*delete:*/ 0);
|
|
if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
|
|
if (fw)
|
|
load_firmware(fw, temp);
|
|
}
|
|
}
|
|
|
|
if (seq) {
|
|
xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));
|
|
}
|
|
}
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
RELEASE_CONFIG_BUFFER(temp);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|