Bump procd-2016-07-29-2c9f5d4af1559b840c42f1443ede9f9fe809c58b

src/3P/procd/plug/coldplug.c

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * 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.
+ */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+
+#include <unistd.h>
+
+#include "../procd.h"
+#include "../libc-compat.h"
+
+#include "hotplug.h"
+
+static struct uloop_process udevtrigger;
+
+static void coldplug_complete(struct uloop_timeout *t)
+{
+	DEBUG(4, "Coldplug complete\n");
+	hotplug_last_event(NULL);
+	procd_state_next();
+}
+
+static void udevtrigger_complete(struct uloop_process *proc, int ret)
+{
+	DEBUG(4, "Finished udevtrigger\n");
+	hotplug_last_event(coldplug_complete);
+}
+
+void procd_coldplug(void)
+{
+	char *argv[] = { "udevtrigger", NULL };
+	unsigned int oldumask = umask(0);
+
+	umount2("/dev/pts", MNT_DETACH);
+	umount2("/dev/", MNT_DETACH);
+	mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755,size=512K");
+	ignore(symlink("/tmp/shm", "/dev/shm"));
+	mkdir("/dev/pts", 0755);
+	umask(oldumask);
+	mount("devpts", "/dev/pts", "devpts", MS_NOEXEC | MS_NOSUID, 0);
+	udevtrigger.cb = udevtrigger_complete;
+	udevtrigger.pid = fork();
+	if (!udevtrigger.pid) {
+		execvp(argv[0], argv);
+		ERROR("Failed to start coldplug\n");
+		exit(-1);
+	}
+
+	if (udevtrigger.pid <= 0) {
+		ERROR("Failed to start new coldplug instance\n");
+		return;
+	}
+
+	uloop_process_add(&udevtrigger);
+
+	DEBUG(4, "Launched coldplug instance, pid=%d\n", (int) udevtrigger.pid);
+}

src/3P/procd/plug/hotplug.c

@@ -0,0 +1,622 @@
+/*
+ * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * 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.
+ */
+
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include <linux/types.h>
+#include <linux/netlink.h>
+
+#include <libubox/blobmsg_json.h>
+#include <libubox/json_script.h>
+#include <libubox/uloop.h>
+#include <json-c/json.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <libgen.h>
+#include <grp.h>
+
+#include "../procd.h"
+
+#include "hotplug.h"
+
+#define HOTPLUG_WAIT	500
+
+struct cmd_handler;
+struct cmd_queue {
+	struct list_head list;
+
+	struct blob_attr *msg;
+	struct blob_attr *data;
+	int timeout;
+
+	void (*handler)(struct blob_attr *msg, struct blob_attr *data);
+	void (*start)(struct blob_attr *msg, struct blob_attr *data);
+	void (*complete)(struct blob_attr *msg, struct blob_attr *data, int ret);
+};
+
+struct button_timeout {
+	struct list_head list;
+	struct uloop_timeout timeout;
+	char *name;
+	int seen;
+	struct blob_attr *data;
+};
+
+static LIST_HEAD(cmd_queue);
+static LIST_HEAD(button_timer);
+static struct uloop_process queue_proc;
+static struct uloop_timeout last_event;
+static struct blob_buf b, button_buf;
+static char *rule_file;
+static struct blob_buf script;
+static struct cmd_queue *current;
+
+static void queue_add(struct cmd_handler *h, struct blob_attr *msg, struct blob_attr *data);
+static void handle_button_complete(struct blob_attr *msg, struct blob_attr *data, int ret);
+
+static void button_free(struct button_timeout *b)
+{
+	uloop_timeout_cancel(&b->timeout);
+	list_del(&b->list);
+	free(b->data);
+	free(b->name);
+	free(b);
+}
+
+static void button_timeout_remove(char *button)
+{
+	struct button_timeout *b, *c;
+
+	if (!list_empty(&button_timer)) list_for_each_entry_safe(b, c, &button_timer, list) {
+		if (!strcmp(b->name, button))
+			button_free(b);
+	}
+}
+
+static char *hotplug_msg_find_var(struct blob_attr *msg, const char *name)
+{
+	struct blob_attr *cur;
+	int rem;
+
+	blobmsg_for_each_attr(cur, msg, rem) {
+		if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
+			continue;
+
+		if (strcmp(blobmsg_name(cur), name) != 0)
+			continue;
+
+		return blobmsg_data(cur);
+	}
+
+	return NULL;
+}
+
+static void mkdir_p(char *dir)
+{
+	char *l = strrchr(dir, '/');
+
+	if (l) {
+		*l = '\0';
+		mkdir_p(dir);
+		*l = '/';
+		mkdir(dir, 0755);
+	}
+}
+
+static void handle_makedev(struct blob_attr *msg, struct blob_attr *data)
+{
+	unsigned int oldumask = umask(0);
+	static struct blobmsg_policy mkdev_policy[3] = {
+		{ .type = BLOBMSG_TYPE_STRING },
+		{ .type = BLOBMSG_TYPE_STRING },
+		{ .type = BLOBMSG_TYPE_STRING },
+	};
+	struct blob_attr *tb[3];
+	char *minor = hotplug_msg_find_var(msg, "MINOR");
+	char *major = hotplug_msg_find_var(msg, "MAJOR");
+	char *subsystem = hotplug_msg_find_var(msg, "SUBSYSTEM");
+
+	blobmsg_parse_array(mkdev_policy, 3, tb, blobmsg_data(data), blobmsg_data_len(data));
+	if (tb[0] && tb[1] && minor && major && subsystem) {
+		mode_t m = S_IFCHR;
+		char *d = strdup(blobmsg_get_string(tb[0]));
+
+		d = dirname(d);
+		mkdir_p(d);
+		free(d);
+
+		if (!strcmp(subsystem, "block"))
+			m = S_IFBLK;
+		mknod(blobmsg_get_string(tb[0]),
+				m | strtoul(blobmsg_data(tb[1]), NULL, 8),
+				makedev(atoi(major), atoi(minor)));
+		if (tb[2]) {
+			struct group *g = getgrnam(blobmsg_get_string(tb[2]));
+
+			if (g)
+				chown(blobmsg_get_string(tb[0]), 0, g->gr_gid);
+			else
+				ERROR("cannot set group %s for %s\n",
+					blobmsg_get_string(tb[2]),
+					blobmsg_get_string(tb[0]));
+		}
+	}
+	umask(oldumask);
+}
+
+static void handle_rm(struct blob_attr *msg, struct blob_attr *data)
+{
+	static struct blobmsg_policy rm_policy = {
+		.type = BLOBMSG_TYPE_STRING,
+	};
+	struct blob_attr *tb;
+
+	blobmsg_parse_array(&rm_policy, 1, &tb, blobmsg_data(data), blobmsg_data_len(data));
+	if (tb)
+		unlink(blobmsg_data(tb));
+}
+
+static void handle_exec(struct blob_attr *msg, struct blob_attr *data)
+{
+	char *argv[8];
+	struct blob_attr *cur;
+	int rem, fd;
+	int i = 0;
+
+	blobmsg_for_each_attr(cur, msg, rem)
+		setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
+
+	blobmsg_for_each_attr(cur, data, rem) {
+		argv[i] = blobmsg_data(cur);
+		i++;
+		if (i == 7)
+			break;
+	}
+
+	if (debug < 3) {
+		fd = open("/dev/null", O_RDWR);
+		if (fd > -1) {
+			dup2(fd, STDIN_FILENO);
+			dup2(fd, STDOUT_FILENO);
+			dup2(fd, STDERR_FILENO);
+			if (fd > STDERR_FILENO)
+				close(fd);
+		}
+	}
+
+	if (i > 0) {
+		argv[i] = NULL;
+		execvp(argv[0], &argv[0]);
+	}
+	exit(-1);
+}
+
+static void handle_button_start(struct blob_attr *msg, struct blob_attr *data)
+{
+	char *button = hotplug_msg_find_var(msg, "BUTTON");
+
+	if (button)
+		button_timeout_remove(button);
+}
+
+static void handle_firmware(struct blob_attr *msg, struct blob_attr *data)
+{
+	char *dir = blobmsg_get_string(blobmsg_data(data));
+	char *file = hotplug_msg_find_var(msg, "FIRMWARE");
+	char *dev = hotplug_msg_find_var(msg, "DEVPATH");
+	struct stat s = { 0 };
+	char *path, loadpath[256], syspath[256];
+	int fw, src, load, len;
+	static char buf[4096];
+
+	DEBUG(2, "Firmware request for %s/%s\n", dir, file);
+
+	if (!file || !dir || !dev) {
+		ERROR("Request for unknown firmware %s/%s\n", dir, file);
+		exit(-1);
+	}
+
+	path = alloca(strlen(dir) + strlen(file) + 2);
+	sprintf(path, "%s/%s", dir, file);
+
+	if (stat(path, &s)) {
+		ERROR("Could not find firmware %s\n", path);
+		src = -1;
+		s.st_size = 0;
+		goto send_to_kernel;
+	}
+
+	src = open(path, O_RDONLY);
+	if (src < 0) {
+		ERROR("Failed to open %s\n", path);
+		s.st_size = 0;
+		goto send_to_kernel;
+	}
+
+send_to_kernel:
+	snprintf(loadpath, sizeof(loadpath), "/sys/%s/loading", dev);
+	load = open(loadpath, O_WRONLY);
+	if (!load) {
+		ERROR("Failed to open %s\n", loadpath);
+		exit(-1);
+	}
+	if (write(load, "1", 1) == -1) {
+		ERROR("Failed to write to %s\n", loadpath);
+		exit(-1);
+	}
+	close(load);
+
+	snprintf(syspath, sizeof(syspath), "/sys/%s/data", dev);
+	fw = open(syspath, O_WRONLY);
+	if (fw < 0) {
+		ERROR("Failed to open %s\n", syspath);
+		exit(-1);
+	}
+
+	len = s.st_size;
+	while (len) {
+		len = read(src, buf, sizeof(buf));
+		if (len <= 0)
+			break;
+
+		if (write(fw, buf, len) == -1) {
+			ERROR("failed to write firmware file %s/%s to %s\n", dir, file, dev);
+			break;
+		}
+	}
+
+	if (src >= 0)
+		close(src);
+	close(fw);
+
+	load = open(loadpath, O_WRONLY);
+	if (write(load, "0", 1) == -1)
+		ERROR("failed to write to %s\n", loadpath);
+	close(load);
+
+	DEBUG(2, "Done loading %s\n", path);
+
+	exit(-1);
+}
+
+enum {
+	HANDLER_MKDEV = 0,
+	HANDLER_RM,
+	HANDLER_EXEC,
+	HANDLER_BUTTON,
+	HANDLER_FW,
+};
+
+static struct cmd_handler {
+	char *name;
+	int atomic;
+	void (*handler)(struct blob_attr *msg, struct blob_attr *data);
+	void (*start)(struct blob_attr *msg, struct blob_attr *data);
+	void (*complete)(struct blob_attr *msg, struct blob_attr *data, int ret);
+} handlers[] = {
+	[HANDLER_MKDEV] = {
+		.name = "makedev",
+		.atomic = 1,
+		.handler = handle_makedev,
+	},
+	[HANDLER_RM] = {
+		.name = "rm",
+		.atomic = 1,
+		.handler = handle_rm,
+	},
+	[HANDLER_EXEC] = {
+		.name = "exec",
+		.handler = handle_exec,
+	},
+	[HANDLER_BUTTON] = {
+		.name = "button",
+		.handler = handle_exec,
+		.start = handle_button_start,
+		.complete = handle_button_complete,
+	},
+	[HANDLER_FW] = {
+		.name = "load-firmware",
+		.handler = handle_firmware,
+	},
+};
+
+static void queue_next(void)
+{
+	struct cmd_queue *c;
+
+	if (queue_proc.pending || list_empty(&cmd_queue))
+		return;
+
+	c = list_first_entry(&cmd_queue, struct cmd_queue, list);
+
+	queue_proc.pid = fork();
+	if (!queue_proc.pid) {
+		uloop_done();
+		c->handler(c->msg, c->data);
+		exit(0);
+	}
+	if (c->start)
+		c->start(c->msg, c->data);
+	list_del(&c->list);
+	if (c->complete)
+		current = c;
+	else
+		free(c);
+	if (queue_proc.pid <= 0) {
+		queue_next();
+		return;
+	}
+
+	uloop_process_add(&queue_proc);
+
+	DEBUG(4, "Launched hotplug exec instance, pid=%d\n", (int) queue_proc.pid);
+}
+
+static void queue_proc_cb(struct uloop_process *c, int ret)
+{
+	DEBUG(4, "Finished hotplug exec instance, pid=%d\n", (int) c->pid);
+
+	if (current) {
+		current->complete(current->msg, current->data, ret);
+		free(current);
+		current = NULL;
+	}
+	queue_next();
+}
+
+static void queue_add(struct cmd_handler *h, struct blob_attr *msg, struct blob_attr *data)
+{
+	struct cmd_queue *c = NULL;
+	struct blob_attr *_msg, *_data;
+
+	c = calloc_a(sizeof(struct cmd_queue),
+		&_msg, blob_pad_len(msg),
+		&_data, blob_pad_len(data),
+		NULL);
+
+	c->msg = _msg;
+	c->data = _data;
+
+	if (!c)
+		return;
+
+	memcpy(c->msg, msg, blob_pad_len(msg));
+	memcpy(c->data, data, blob_pad_len(data));
+	c->handler = h->handler;
+	c->complete = h->complete;
+	c->start = h->start;
+	list_add_tail(&c->list, &cmd_queue);
+	queue_next();
+}
+
+static void handle_button_timeout(struct uloop_timeout *t)
+{
+	struct button_timeout *b;
+	char seen[16];
+
+	b = container_of(t, struct button_timeout, timeout);
+	blob_buf_init(&button_buf, 0);
+	blobmsg_add_string(&button_buf, "BUTTON", b->name);
+	blobmsg_add_string(&button_buf, "ACTION", "timeout");
+	snprintf(seen, sizeof(seen), "%d", b->seen);
+	blobmsg_add_string(&button_buf, "SEEN", seen);
+	queue_add(&handlers[HANDLER_EXEC], button_buf.head, b->data);
+	button_free(b);
+}
+
+static void handle_button_complete(struct blob_attr *msg, struct blob_attr *data, int ret)
+{
+	char *name = hotplug_msg_find_var(msg, "BUTTON");
+	struct button_timeout *b;
+	int timeout = ret >> 8;
+
+	if (!timeout)
+		return;
+
+	b = malloc(sizeof(*b));
+	if (!b || !name)
+		return;
+
+	memset(b, 0, sizeof(*b));
+
+	b->data = malloc(blob_pad_len(data));
+	b->name = strdup(name);
+	b->seen = timeout;
+
+	memcpy(b->data, data, blob_pad_len(data));
+	b->timeout.cb = handle_button_timeout;
+
+	uloop_timeout_set(&b->timeout, timeout * 1000);
+	list_add(&b->list, &button_timer);
+}
+
+static const char* rule_handle_var(struct json_script_ctx *ctx, const char *name, struct blob_attr *vars)
+{
+	const char *str, *sep;
+
+	if (!strcmp(name, "DEVICENAME") || !strcmp(name, "DEVNAME")) {
+		str = json_script_find_var(ctx, vars, "DEVPATH");
+		if (!str)
+			return NULL;
+
+		sep = strrchr(str, '/');
+		if (sep)
+			return sep + 1;
+
+		return str;
+	}
+
+	return NULL;
+}
+
+static struct json_script_file *
+rule_handle_file(struct json_script_ctx *ctx, const char *name)
+{
+	json_object *obj;
+
+	obj = json_object_from_file((char*)name);
+	if (!obj)
+		return NULL;
+
+	blob_buf_init(&script, 0);
+	blobmsg_add_json_element(&script, "", obj);
+
+	return json_script_file_from_blobmsg(name, blob_data(script.head), blob_len(script.head));
+}
+
+static void rule_handle_command(struct json_script_ctx *ctx, const char *name,
+				struct blob_attr *data, struct blob_attr *vars)
+{
+	struct blob_attr *cur;
+	int rem, i;
+
+	if (debug > 3) {
+		DEBUG(4, "Command: %s", name);
+		blobmsg_for_each_attr(cur, data, rem)
+			DEBUG(4, " %s", (char *) blobmsg_data(cur));
+		DEBUG(4, "\n");
+
+		DEBUG(4, "Message:");
+		blobmsg_for_each_attr(cur, vars, rem)
+			DEBUG(4, " %s=%s", blobmsg_name(cur), (char *) blobmsg_data(cur));
+		DEBUG(4, "\n");
+	}
+
+	for (i = 0; i < ARRAY_SIZE(handlers); i++)
+		if (!strcmp(handlers[i].name, name)) {
+			if (handlers[i].atomic)
+				handlers[i].handler(vars, data);
+			else
+				queue_add(&handlers[i], vars, data);
+			break;
+		}
+
+	if (last_event.cb)
+		uloop_timeout_set(&last_event, HOTPLUG_WAIT);
+}
+
+static void rule_handle_error(struct json_script_ctx *ctx, const char *msg,
+				struct blob_attr *context)
+{
+	char *s;
+
+	s = blobmsg_format_json(context, false);
+	ERROR("ERROR: %s in block: %s\n", msg, s);
+	free(s);
+}
+
+static struct json_script_ctx jctx = {
+	.handle_var = rule_handle_var,
+	.handle_error = rule_handle_error,
+	.handle_command = rule_handle_command,
+	.handle_file = rule_handle_file,
+};
+
+static void hotplug_handler_debug(struct blob_attr *data)
+{
+	char *str;
+
+	if (debug < 3)
+		return;
+
+	str = blobmsg_format_json(data, true);
+	DEBUG(3, "%s\n", str);
+	free(str);
+}
+
+static void hotplug_handler(struct uloop_fd *u, unsigned int ev)
+{
+	int i = 0;
+	static char buf[4096];
+	int len = recv(u->fd, buf, sizeof(buf), MSG_DONTWAIT);
+	void *index;
+	if (len < 1)
+		return;
+
+	blob_buf_init(&b, 0);
+	index = blobmsg_open_table(&b, NULL);
+	while (i < len) {
+		int l = strlen(buf + i) + 1;
+		char *e = strstr(&buf[i], "=");
+
+		if (e) {
+			*e = '\0';
+			blobmsg_add_string(&b, &buf[i], &e[1]);
+		}
+		i += l;
+	}
+	blobmsg_close_table(&b, index);
+	hotplug_handler_debug(b.head);
+	json_script_run(&jctx, rule_file, blob_data(b.head));
+}
+
+static struct uloop_fd hotplug_fd = {
+	.cb = hotplug_handler,
+};
+
+void hotplug_last_event(uloop_timeout_handler handler)
+{
+	last_event.cb = handler;
+	if (handler)
+		uloop_timeout_set(&last_event, HOTPLUG_WAIT);
+	else
+		uloop_timeout_cancel(&last_event);
+}
+
+void hotplug(char *rules)
+{
+	struct sockaddr_nl nls;
+	int nlbufsize = 512 * 1024;
+
+	rule_file = strdup(rules);
+	memset(&nls,0,sizeof(struct sockaddr_nl));
+	nls.nl_family = AF_NETLINK;
+	nls.nl_pid = getpid();
+	nls.nl_groups = -1;
+
+	if ((hotplug_fd.fd = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT)) == -1) {
+		ERROR("Failed to open hotplug socket: %s\n", strerror(errno));
+		exit(1);
+	}
+	if (bind(hotplug_fd.fd, (void *)&nls, sizeof(struct sockaddr_nl))) {
+		ERROR("Failed to bind hotplug socket: %s\n", strerror(errno));
+		exit(1);
+	}
+
+	if (setsockopt(hotplug_fd.fd, SOL_SOCKET, SO_RCVBUFFORCE, &nlbufsize, sizeof(nlbufsize)))
+		ERROR("Failed to resize receive buffer: %s\n", strerror(errno));
+
+	json_script_init(&jctx);
+	queue_proc.cb = queue_proc_cb;
+	uloop_fd_add(&hotplug_fd, ULOOP_READ);
+}
+
+int hotplug_run(char *rules)
+{
+	uloop_init();
+	hotplug(rules);
+	uloop_run();
+
+	return 0;
+}
+
+void hotplug_shutdown(void)
+{
+	uloop_fd_delete(&hotplug_fd);
+	close(hotplug_fd.fd);
+}

src/3P/procd/plug/hotplug.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * 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.
+ */
+
+#ifndef __PROCD_HOTPLUG_H
+#define __PROCD_HOTPLUG_H
+
+#include <libubox/uloop.h>
+
+#ifndef DISABLE_INIT
+void hotplug(char *rules);
+int hotplug_run(char *rules);
+void hotplug_shutdown(void);
+void hotplug_last_event(uloop_timeout_handler handler);
+void procd_coldplug(void);
+#else
+static inline void hotplug(char *rules)
+{
+}
+
+static inline int hotplug_run(char *rules)
+{
+	return 0;
+}
+
+static inline void hotplug_shutdown(void)
+{
+}
+
+static inline void hotplug_last_event(uloop_timeout_handler handler)
+{
+}
+
+static inline void procd_coldplug(void)
+{
+}
+#endif
+
+#endif

src/3P/procd/plug/udevtrigger.c

@@ -0,0 +1,264 @@
+/*
+ * 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 <stdio.h>
+#include <stdbool.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>
+#include <string.h>
+
+#define PATH_SIZE 512
+
+#ifndef strlcpy
+#define strlcpy(d,s,l) (strncpy(d,s,l), (d)[(l)-1] = '\0')
+#endif
+
+#ifndef strlcat
+#define strlcat(d,s,l) strncat(d,s,(l)-strlen(d)-1)
+#endif
+
+static int verbose;
+static int dry_run;
+
+static 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) - 1);
+	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 bool device_has_attribute(const char *path, const char *attr,
+				 mode_t mode)
+{
+	char filename[PATH_SIZE];
+	struct stat statbuf;
+
+	strlcpy(filename, path, sizeof(filename));
+	strlcat(filename, attr, sizeof(filename));
+
+	if (stat(filename, &statbuf) < 0)
+		return false;
+
+	if (!(statbuf.st_mode & mode))
+		return false;
+
+	return true;
+}
+
+static int device_list_insert(const char *path)
+{
+	char devpath[PATH_SIZE];
+	struct stat statbuf;
+
+	dbg("add '%s'" , path);
+
+	/* we only have a device, if we have a dev and an uevent file */
+	if (!device_has_attribute(path, "/dev", S_IRUSR) ||
+	    !device_has_attribute(path, "/uevent", 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_subdir(const char *base, const char *subdir,
+		        bool insert, int depth)
+{
+	DIR *dir;
+	struct dirent *dent;
+
+	dir = opendir(base);
+	if (dir == NULL)
+		return;
+
+	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+		char dirname[PATH_SIZE];
+
+		if (dent->d_name[0] == '.')
+			continue;
+
+		strlcpy(dirname, base, sizeof(dirname));
+		strlcat(dirname, "/", sizeof(dirname));
+		strlcat(dirname, dent->d_name, sizeof(dirname));
+
+		if (insert) {
+			int err;
+
+			err = device_list_insert(dirname);
+			if (err)
+				continue;
+		}
+
+		if (subdir)
+			strlcat(dirname, subdir, sizeof(base));
+
+		if (depth)
+			scan_subdir(dirname, NULL, true, depth - 1);
+	}
+
+	closedir(dir);
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+	struct stat statbuf;
+	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_subdir("/sys/bus", "/devices", false, 1);
+	scan_subdir("/sys/class", NULL, false, 1);
+
+	/* scan "block" if it isn't a "class" */
+	if (stat("/sys/class/block", &statbuf) != 0)
+		scan_subdir("/sys/block", NULL, true, 1);
+
+exit:
+
+	closelog();
+	return 0;
+}