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-rw-r--r--udev/udevtrigger.c712
1 files changed, 712 insertions, 0 deletions
diff --git a/udev/udevtrigger.c b/udev/udevtrigger.c
new file mode 100644
index 0000000000..d4b10d06ab
--- /dev/null
+++ b/udev/udevtrigger.c
@@ -0,0 +1,712 @@
+/*
+ * 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 <sys/socket.h>
+#include <sys/un.h>
+
+#include "udev.h"
+#include "udevd.h"
+#include "udev_rules.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);
+static int sock = -1;
+static struct sockaddr_un saddr;
+static socklen_t saddrlen;
+
+/* 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'\n" , 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, const char *action)
+{
+ 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, action, strlen(action)) < 0)
+ info("error writing '%s' to '%s': %s\n", action, filename, strerror(errno));
+
+ close(fd);
+}
+
+static int pass_to_socket(const char *devpath, const char *action, const char *env)
+{
+ struct udevice udev;
+ struct name_entry *name_loop;
+ char buf[4096];
+ size_t bufpos = 0;
+ ssize_t count;
+ char path[PATH_SIZE];
+ int fd;
+ char link_target[PATH_SIZE];
+ int len;
+ int err = 0;
+
+ if (verbose)
+ printf("%s\n", devpath);
+
+ udev_device_init(&udev);
+ udev_db_get_device(&udev, devpath);
+
+ /* add header */
+ bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
+ bufpos++;
+
+ /* add cookie */
+ if (env != NULL) {
+ bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "%s", env);
+ bufpos++;
+ }
+
+ /* add standard keys */
+ bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVPATH=%s", devpath);
+ bufpos++;
+ bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "ACTION=%s", action);
+ bufpos++;
+
+ /* add subsystem */
+ strlcpy(path, sysfs_path, sizeof(path));
+ strlcat(path, devpath, sizeof(path));
+ strlcat(path, "/subsystem", sizeof(path));
+ len = readlink(path, link_target, sizeof(link_target));
+ if (len > 0) {
+ char *pos;
+
+ link_target[len] = '\0';
+ pos = strrchr(link_target, '/');
+ if (pos != NULL) {
+ bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "SUBSYSTEM=%s", &pos[1]);
+ bufpos++;
+ }
+ }
+
+ /* add symlinks and node name */
+ path[0] = '\0';
+ list_for_each_entry(name_loop, &udev.symlink_list, node) {
+ strlcat(path, udev_root, sizeof(path));
+ strlcat(path, "/", sizeof(path));
+ strlcat(path, name_loop->name, sizeof(path));
+ strlcat(path, " ", sizeof(path));
+ }
+ remove_trailing_chars(path, ' ');
+ if (path[0] != '\0') {
+ bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVLINKS=%s", path);
+ bufpos++;
+ }
+ if (udev.name[0] != '\0') {
+ strlcpy(path, udev_root, sizeof(path));
+ strlcat(path, "/", sizeof(path));
+ strlcat(path, udev.name, sizeof(path));
+ bufpos += snprintf(&buf[bufpos], sizeof(buf)-1, "DEVNAME=%s", path);
+ bufpos++;
+ }
+
+ /* add keys from device "uevent" file */
+ strlcpy(path, sysfs_path, sizeof(path));
+ strlcat(path, devpath, sizeof(path));
+ strlcat(path, "/uevent", sizeof(path));
+ fd = open(path, O_RDONLY);
+ if (fd >= 0) {
+ char value[4096];
+
+ count = read(fd, value, sizeof(value));
+ close(fd);
+ if (count > 0) {
+ char *key;
+
+ value[count] = '\0';
+ key = value;
+ while (key[0] != '\0') {
+ char *next;
+
+ next = strchr(key, '\n');
+ if (next == NULL)
+ break;
+ next[0] = '\0';
+ bufpos += strlcpy(&buf[bufpos], key, sizeof(buf) - bufpos-1);
+ bufpos++;
+ key = &next[1];
+ }
+ }
+ }
+
+ /* add keys from database */
+ list_for_each_entry(name_loop, &udev.env_list, node) {
+ bufpos += strlcpy(&buf[bufpos], name_loop->name, sizeof(buf) - bufpos-1);
+ bufpos++;
+ }
+ if (bufpos > sizeof(buf))
+ bufpos = sizeof(buf);
+
+ count = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, saddrlen);
+ if (count < 0)
+ err = -1;
+
+ return err;
+}
+
+static void exec_list(const char *action, const char *env)
+{
+ 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;
+ if (sock >= 0)
+ pass_to_socket(loop_device->name, action, env);
+ else
+ trigger_uevent(loop_device->name, action);
+ list_del(&loop_device->node);
+ free(loop_device);
+ }
+
+ /* trigger remaining delayed devices */
+ list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
+ if (sock >= 0)
+ pass_to_socket(loop_device->name, action, env);
+ else
+ trigger_uevent(loop_device->name, action);
+ 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;
+}
+
+enum scan_type {
+ SCAN_DEVICES,
+ SCAN_SUBSYSTEM,
+};
+
+static void scan_subsystem(const char *subsys, enum scan_type scan)
+{
+ char base[PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
+ const char *subdir;
+
+ if (scan == SCAN_DEVICES)
+ subdir = "/devices";
+ else if (scan == SCAN_SUBSYSTEM)
+ subdir = "/drivers";
+ else
+ return;
+
+ 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 (scan == SCAN_DEVICES)
+ if (subsystem_filtered(dent->d_name))
+ continue;
+
+ strlcpy(dirname, base, sizeof(dirname));
+ strlcat(dirname, "/", sizeof(dirname));
+ strlcat(dirname, dent->d_name, sizeof(dirname));
+
+ if (scan == SCAN_SUBSYSTEM) {
+ if (!subsystem_filtered("subsystem"))
+ device_list_insert(dirname);
+ if (subsystem_filtered("drivers"))
+ continue;
+ }
+
+ strlcat(dirname, subdir, sizeof(dirname));
+
+ /* look for devices/drivers */
+ 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;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ start = strlcpy(device, sysfs_path, sizeof(device));
+ if(start >= sizeof(device))
+ start = sizeof(device) - 1;
+ strlcat(device, dent->d_name, sizeof(device));
+ path_decode(&device[start]);
+ device_list_insert(device);
+ }
+ closedir(dir);
+ }
+}
+
+int udevtrigger(int argc, char *argv[], char *envp[])
+{
+ int failed = 0;
+ const char *sockpath = NULL;
+ int option;
+ const char *action = "add";
+ const char *env = NULL;
+ static const struct option options[] = {
+ { "verbose", 0, NULL, 'v' },
+ { "dry-run", 0, NULL, 'n' },
+ { "retry-failed", 0, NULL, 'F' },
+ { "socket", 1, NULL, 'o' },
+ { "help", 0, NULL, 'h' },
+ { "action", 1, NULL, 'c' },
+ { "subsystem-match", 1, NULL, 's' },
+ { "subsystem-nomatch", 1, NULL, 'S' },
+ { "attr-match", 1, NULL, 'a' },
+ { "attr-nomatch", 1, NULL, 'A' },
+ { "env", 1, NULL, 'e' },
+ {}
+ };
+
+ logging_init("udevtrigger");
+ udev_config_init();
+ dbg("version %s\n", UDEV_VERSION);
+ sysfs_init();
+
+ while (1) {
+ option = getopt_long(argc, argv, "vnFo:hce::s: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 'o':
+ sockpath = optarg;
+ break;
+ case 'c':
+ action = optarg;
+ break;
+ case 'e':
+ if (strchr(optarg, '=') != NULL)
+ env = optarg;
+ 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: udevadm trigger 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"
+ " --socket=<socket path> pass events to socket instead of triggering kernel events\n"
+ " --env=<KEY>=<value> pass an additional key (works only with --socket=)\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 (sockpath != NULL) {
+ struct stat stats;
+
+ sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ memset(&saddr, 0x00, sizeof(struct sockaddr_un));
+ saddr.sun_family = AF_LOCAL;
+ if (sockpath[0] == '@') {
+ /* abstract namespace socket requested */
+ strlcpy(&saddr.sun_path[1], &sockpath[1], sizeof(saddr.sun_path)-1);
+ saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
+ } else if (stat(sockpath, &stats) == 0 && S_ISSOCK(stats.st_mode)) {
+ /* existing socket file */
+ strlcpy(saddr.sun_path, sockpath, sizeof(saddr.sun_path));
+ saddrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
+ } else {
+ /* no socket file, assume abstract namespace socket */
+ strlcpy(&saddr.sun_path[1], sockpath, sizeof(saddr.sun_path)-1);
+ saddrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
+ }
+ } else if (env != NULL) {
+ fprintf(stderr, "error: --env= only valid with --socket= option\n");
+ goto exit;
+ }
+
+ if (failed) {
+ scan_failed();
+ exec_list(action, env);
+ } 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", SCAN_SUBSYSTEM);
+ exec_list(action, env);
+ scan_subsystem("subsystem", SCAN_DEVICES);
+ exec_list(action, env);
+ } else {
+ scan_subsystem("bus", SCAN_SUBSYSTEM);
+ exec_list(action, env);
+ scan_subsystem("bus", SCAN_DEVICES);
+ 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(action, env);
+ }
+ }
+
+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);
+
+ if (sock >= 0)
+ close(sock);
+ sysfs_cleanup();
+ logging_close();
+ return 0;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-28 08:16:04 +0000