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-rw-r--r--package/hotplug2/src/udevtrigger.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/package/hotplug2/src/udevtrigger.c b/package/hotplug2/src/udevtrigger.c
new file mode 100644
index 0000000000..297e64cc96
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+++ b/package/hotplug2/src/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 <stdarg.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 <sys/stat.h>
+#include <sys/types.h>
+
+#define PATH_SIZE 512
+
+static int verbose;
+static int dry_run;
+
+void log_message(int priority, const char *format, ...)
+{
+ va_list args;
+
+ va_start(args, format);
+ vsyslog(priority, format, args);
+ va_end(args);
+}
+
+#undef err
+#define err(format, arg...) \
+ do { \
+ log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg); \
+ } while (0)
+
+#undef info
+#define info(format, arg...) \
+ do { \
+ log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg); \
+ } while (0)
+
+#ifdef DEBUG
+#undef dbg
+#define dbg(format, arg...) \
+ do { \
+ log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg); \
+ } while (0)
+#else
+#define dbg(...) do {} while(0)
+#endif
+
+
+static void trigger_uevent(const char *devpath)
+{
+ char filename[PATH_SIZE];
+ int fd;
+
+ strlcpy(filename, "/sys", 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 int sysfs_resolve_link(char *devpath, size_t size)
+{
+ char link_path[PATH_SIZE];
+ char link_target[PATH_SIZE];
+ int len;
+ int i;
+ int back;
+
+ strlcpy(link_path, "/sys", sizeof(link_path));
+ strlcat(link_path, devpath, sizeof(link_path));
+ len = readlink(link_path, link_target, sizeof(link_target));
+ if (len <= 0)
+ return -1;
+ link_target[len] = '\0';
+ dbg("path link '%s' points to '%s'", devpath, link_target);
+
+ for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
+ ;
+ dbg("base '%s', tail '%s', back %i", devpath, &link_target[back * 3], back);
+ for (i = 0; i <= back; i++) {
+ char *pos = strrchr(devpath, '/');
+
+ if (pos == NULL)
+ return -1;
+ pos[0] = '\0';
+ }
+ dbg("after moving back '%s'", devpath);
+ strlcat(devpath, "/", size);
+ strlcat(devpath, &link_target[back * 3], size);
+ 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[4], 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;
+
+ trigger_uevent(devpath);
+ return 0;
+}
+
+
+static void scan_subsystem(const char *subsys)
+{
+ char base[PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
+
+ strlcpy(base, "/sys/", 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;
+
+ 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));
+ device_list_insert(dirname2);
+ }
+ closedir(dir2);
+ }
+ }
+ closedir(dir);
+ }
+}
+
+static void scan_block(void)
+{
+ char base[PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
+
+ strlcpy(base, "/sys/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 (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));
+ device_list_insert(dirname2);
+ }
+ closedir(dir2);
+ }
+ }
+ closedir(dir);
+ }
+}
+
+static void scan_class(void)
+{
+ char base[PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
+
+ strlcpy(base, "/sys/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;
+
+ 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));
+ device_list_insert(dirname2);
+ }
+ closedir(dir2);
+ }
+ }
+ closedir(dir);
+ }
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+ char base[PATH_SIZE];
+ struct stat statbuf;
+ int failed = 0;
+ int option;
+
+ openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON);
+
+ while (1) {
+ option = getopt(argc, argv, "vnh");
+ if (option == -1)
+ break;
+
+ switch (option) {
+ case 'v':
+ verbose = 1;
+ break;
+ case 'n':
+ dry_run = 1;
+ break;
+ case 'h':
+ printf("Usage: udevtrigger OPTIONS\n"
+ " -v print the list of devices while running\n"
+ " -n do not actually trigger the events\n"
+ " -h print this text\n"
+ "\n");
+ goto exit;
+ default:
+ goto exit;
+ }
+ }
+
+
+ /* if we have /sys/subsystem, forget all the old stuff */
+ scan_subsystem("bus");
+ scan_class();
+
+ /* scan "block" if it isn't a "class" */
+ strlcpy(base, "/sys/class/block", sizeof(base));
+ if (stat(base, &statbuf) != 0)
+ scan_block();
+
+exit:
+
+ closelog();
+ return 0;
+}
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