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systemd/udevtrigger.c

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/*
* Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
* Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <syslog.h>
#include <fnmatch.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "udev.h"
#include "udevd.h"
static int verbose;
static int dry_run;
LIST_HEAD(device_list);
LIST_HEAD(filter_subsystem_match_list);
LIST_HEAD(filter_subsystem_nomatch_list);
LIST_HEAD(filter_attr_match_list);
LIST_HEAD(filter_attr_nomatch_list);
#ifdef USE_LOG
void log_message(int priority, const char *format, ...)
{
va_list args;
if (priority > udev_log_priority)
return;
va_start(args, format);
vsyslog(priority, format, args);
va_end(args);
}
#endif
/* devices that should run last cause of their dependencies */
static int delay_device(const char *devpath)
{
static const char *delay_device_list[] = {
"*/md*",
"*/dm-*",
NULL
};
int i;
for (i = 0; delay_device_list[i] != NULL; i++)
if (fnmatch(delay_device_list[i], devpath, 0) == 0)
return 1;
return 0;
}
static int device_list_insert(const char *path)
{
char filename[PATH_SIZE];
char devpath[PATH_SIZE];
struct stat statbuf;
dbg("add '%s'" , path);
/* we only have a device, if we have an uevent file */
strlcpy(filename, path, sizeof(filename));
strlcat(filename, "/uevent", sizeof(filename));
if (stat(filename, &statbuf) < 0)
return -1;
if (!(statbuf.st_mode & S_IWUSR))
return -1;
strlcpy(devpath, &path[strlen(sysfs_path)], sizeof(devpath));
/* resolve possible link to real target */
if (lstat(path, &statbuf) < 0)
return -1;
if (S_ISLNK(statbuf.st_mode))
if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
return -1;
name_list_add(&device_list, devpath, 1);
return 0;
}
static void trigger_uevent(const char *devpath)
{
char filename[PATH_SIZE];
int fd;
strlcpy(filename, sysfs_path, sizeof(filename));
strlcat(filename, devpath, sizeof(filename));
strlcat(filename, "/uevent", sizeof(filename));
if (verbose)
printf("%s\n", devpath);
if (dry_run)
return;
fd = open(filename, O_WRONLY);
if (fd < 0) {
dbg("error on opening %s: %s\n", filename, strerror(errno));
return;
}
if (write(fd, "add", 3) < 0)
info("error on triggering %s: %s\n", filename, strerror(errno));
close(fd);
}
static void exec_list(void)
{
struct name_entry *loop_device;
struct name_entry *tmp_device;
list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
if (delay_device(loop_device->name))
continue;
trigger_uevent(loop_device->name);
list_del(&loop_device->node);
free(loop_device);
}
/* trigger remaining delayed devices */
list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
trigger_uevent(loop_device->name);
list_del(&loop_device->node);
free(loop_device);
}
}
static int subsystem_filtered(const char *subsystem)
{
struct name_entry *loop_name;
/* skip devices matching the listed subsystems */
list_for_each_entry(loop_name, &filter_subsystem_nomatch_list, node)
if (fnmatch(loop_name->name, subsystem, 0) == 0)
return 1;
/* skip devices not matching the listed subsystems */
if (!list_empty(&filter_subsystem_match_list)) {
list_for_each_entry(loop_name, &filter_subsystem_match_list, node)
if (fnmatch(loop_name->name, subsystem, 0) == 0)
return 0;
return 1;
}
return 0;
}
static int attr_match(const char *path, const char *attr_value)
{
char attr[NAME_SIZE];
char file[PATH_SIZE];
char *match_value;
strlcpy(attr, attr_value, sizeof(attr));
/* separate attr and match value */
match_value = strchr(attr, '=');
if (match_value != NULL) {
match_value[0] = '\0';
match_value = &match_value[1];
}
strlcpy(file, path, sizeof(file));
strlcat(file, "/", sizeof(file));
strlcat(file, attr, sizeof(file));
if (match_value != NULL) {
/* match file content */
char value[NAME_SIZE];
int fd;
ssize_t size;
fd = open(file, O_RDONLY);
if (fd < 0)
return 0;
size = read(fd, value, sizeof(value));
close(fd);
if (size < 0)
return 0;
value[size] = '\0';
remove_trailing_chars(value, '\n');
/* match if attribute value matches */
if (fnmatch(match_value, value, 0) == 0)
return 1;
} else {
/* match if attribute exists */
struct stat statbuf;
if (stat(file, &statbuf) == 0)
return 1;
}
return 0;
}
static int attr_filtered(const char *path)
{
struct name_entry *loop_name;
/* skip devices matching the listed sysfs attributes */
list_for_each_entry(loop_name, &filter_attr_nomatch_list, node)
if (attr_match(path, loop_name->name))
return 1;
/* skip devices not matching the listed sysfs attributes */
if (!list_empty(&filter_attr_match_list)) {
list_for_each_entry(loop_name, &filter_attr_match_list, node)
if (attr_match(path, loop_name->name))
return 0;
return 1;
}
return 0;
}
static void scan_subsystem(const char *subsys)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/", sizeof(base));
strlcat(base, subsys, sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
if (subsystem_filtered(dent->d_name))
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
strlcat(dirname, "/devices", sizeof(dirname));
/* look for devices */
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
if (attr_filtered(dirname2))
continue;
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
static void scan_block(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
if (subsystem_filtered("block"))
return;
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/block", sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
if (attr_filtered(dirname))
continue;
if (device_list_insert(dirname) != 0)
continue;
/* look for partitions */
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
if (!strcmp(dent2->d_name,"device"))
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
if (attr_filtered(dirname2))
continue;
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
static void scan_class(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/class", sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
if (dent->d_name[0] == '.')
continue;
if (subsystem_filtered(dent->d_name))
continue;
strlcpy(dirname, base, sizeof(dirname));
strlcat(dirname, "/", sizeof(dirname));
strlcat(dirname, dent->d_name, sizeof(dirname));
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
char dirname2[PATH_SIZE];
if (dent2->d_name[0] == '.')
continue;
if (!strcmp(dent2->d_name, "device"))
continue;
strlcpy(dirname2, dirname, sizeof(dirname2));
strlcat(dirname2, "/", sizeof(dirname2));
strlcat(dirname2, dent2->d_name, sizeof(dirname2));
if (attr_filtered(dirname2))
continue;
device_list_insert(dirname2);
}
closedir(dir2);
}
}
closedir(dir);
}
}
static void scan_failed(void)
{
char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
strlcpy(base, udev_root, sizeof(base));
strlcat(base, "/" EVENT_FAILED_DIR, sizeof(base));
dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
char device[PATH_SIZE];
size_t start, end, i;
if (dent->d_name[0] == '.')
continue;
strlcpy(device, sysfs_path, sizeof(device));
start = strlcat(device, "/", sizeof(device));
end = strlcat(device, dent->d_name, sizeof(device));
if (end > sizeof(device))
end = sizeof(device);
/* replace PATH_TO_NAME_CHAR with '/' */
for (i = start; i < end; i++)
if (device[i] == PATH_TO_NAME_CHAR)
device[i] = '/';
device_list_insert(device);
}
closedir(dir);
}
}
int main(int argc, char *argv[], char *envp[])
{
int failed = 0;
int option;
static const struct option options[] = {
{ "verbose", 0, NULL, 'v' },
{ "dry-run", 0, NULL, 'n' },
{ "retry-failed", 0, NULL, 'F' },
{ "help", 0, NULL, 'h' },
{ "subsystem-match", 1, NULL, 's' },
{ "subsystem-nomatch", 1, NULL, 'S' },
{ "attr-match", 1, NULL, 'a' },
{ "attr-nomatch", 1, NULL, 'A' },
{}
};
logging_init("udevtrigger");
udev_config_init();
dbg("version %s", UDEV_VERSION);
sysfs_init();
while (1) {
option = getopt_long(argc, argv, "vnFhs:S:a:A:", options, NULL);
if (option == -1)
break;
switch (option) {
case 'v':
verbose = 1;
break;
case 'n':
dry_run = 1;
break;
case 'F':
failed = 1;
break;
case 's':
name_list_add(&filter_subsystem_match_list, optarg, 0);
break;
case 'S':
name_list_add(&filter_subsystem_nomatch_list, optarg, 0);
break;
case 'a':
name_list_add(&filter_attr_match_list, optarg, 0);
break;
case 'A':
name_list_add(&filter_attr_nomatch_list, optarg, 0);
break;
case 'h':
printf("Usage: udevtrigger OPTIONS\n"
" --verbose print the list of devices while running\n"
" --dry-run do not actually trigger the events\n"
" --retry-failed trigger only the events which have been\n"
" marked as failed during a previous run\n"
" --subsystem-match=<subsystem> trigger devices from a matching subystem\n"
" --subsystem-nomatch=<subsystem> exclude devices from a matching subystem\n"
" --attr-match=<file[=<value>]> trigger devices with a matching sysfs\n"
" attribute\n"
" --attr-nomatch=<file[=<value>]> exclude devices with a matching sysfs\n"
" attribute\n"
" --help print this text\n"
"\n");
goto exit;
default:
goto exit;
}
}
if (failed)
scan_failed();
else {
char base[PATH_SIZE];
struct stat statbuf;
/* if we have /sys/subsystem, forget all the old stuff */
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/subsystem", sizeof(base));
if (stat(base, &statbuf) == 0)
scan_subsystem("subsystem");
else {
scan_subsystem("bus");
scan_class();
/* scan "block" if it isn't a "class" */
strlcpy(base, sysfs_path, sizeof(base));
strlcat(base, "/class/block", sizeof(base));
if (stat(base, &statbuf) != 0)
scan_block();
}
}
exec_list();
exit:
name_list_cleanup(&filter_subsystem_match_list);
name_list_cleanup(&filter_subsystem_nomatch_list);
name_list_cleanup(&filter_attr_match_list);
name_list_cleanup(&filter_attr_nomatch_list);
sysfs_cleanup();
logging_close();
return 0;
}
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