2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
16 #include <sys/socket.h>
17 #include <sys/types.h>
19 #include <linux/types.h>
20 #include <linux/netlink.h>
22 #include <libubox/blobmsg_json.h>
23 #include <libubox/json_script.h>
24 #include <libubox/uloop.h>
34 #define HOTPLUG_WAIT 500
37 struct list_head list;
39 struct blob_attr *msg;
40 struct blob_attr *data;
41 void (*handler)(struct blob_attr *msg, struct blob_attr *data);
44 static LIST_HEAD(cmd_queue);
45 static struct uloop_process queue_proc;
46 static struct uloop_timeout last_event;
47 static struct blob_buf b;
48 static char *rule_file;
49 static struct blob_buf script;
51 static char *hotplug_msg_find_var(struct blob_attr *msg, const char *name)
53 struct blob_attr *cur;
56 blobmsg_for_each_attr(cur, msg, rem) {
57 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
60 if (strcmp(blobmsg_name(cur), name) != 0)
63 return blobmsg_data(cur);
69 static void mkdir_p(char *dir)
71 char *l = strrchr(dir, '/');
81 static void handle_makedev(struct blob_attr *msg, struct blob_attr *data)
83 unsigned int oldumask = umask(0);
84 static struct blobmsg_policy mkdev_policy[2] = {
85 { .type = BLOBMSG_TYPE_STRING },
86 { .type = BLOBMSG_TYPE_STRING },
88 struct blob_attr *tb[2];
89 char *minor = hotplug_msg_find_var(msg, "MINOR");
90 char *major = hotplug_msg_find_var(msg, "MAJOR");
91 char *subsystem = hotplug_msg_find_var(msg, "SUBSYSTEM");
93 blobmsg_parse_array(mkdev_policy, 2, tb, blobmsg_data(data), blobmsg_data_len(data));
94 if (tb[0] && tb[1] && minor && major && subsystem) {
96 char *d = strdup(blobmsg_get_string(tb[0]));
102 if (!strcmp(subsystem, "block"))
104 mknod(blobmsg_get_string(tb[0]),
105 m | strtoul(blobmsg_data(tb[1]), NULL, 8),
106 makedev(atoi(major), atoi(minor)));
111 static void handle_rm(struct blob_attr *msg, struct blob_attr *data)
113 static struct blobmsg_policy rm_policy = {
114 .type = BLOBMSG_TYPE_STRING,
116 struct blob_attr *tb;
118 blobmsg_parse_array(&rm_policy, 1, &tb, blobmsg_data(data), blobmsg_data_len(data));
120 unlink(blobmsg_data(tb));
123 static void handle_exec(struct blob_attr *msg, struct blob_attr *data)
126 struct blob_attr *cur;
130 blobmsg_for_each_attr(cur, msg, rem)
131 setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
133 blobmsg_for_each_attr(cur, data, rem) {
134 argv[i] = blobmsg_data(cur);
141 fd = open("/dev/null", O_RDWR);
143 dup2(fd, STDIN_FILENO);
144 dup2(fd, STDOUT_FILENO);
145 dup2(fd, STDERR_FILENO);
146 if (fd > STDERR_FILENO)
153 execvp(argv[0], &argv[0]);
158 static void handle_firmware(struct blob_attr *msg, struct blob_attr *data)
160 char *dir = blobmsg_get_string(blobmsg_data(data));
161 char *file = hotplug_msg_find_var(msg, "FIRMWARE");
162 char *dev = hotplug_msg_find_var(msg, "DEVPATH");
165 char *path, loadpath[256], syspath[256];
166 int fw, load, sys, len;
168 DEBUG(1, "Firmware request for %s/%s\n", dir, file);
170 if (!file || !dir || !dev) {
171 ERROR("Request for unknown firmware %s/%s\n", dir, file);
175 path = malloc(strlen(dir) + strlen(file) + 2);
177 ERROR("Failed to allocate memory\n");
180 sprintf(path, "%s/%s", dir, file);
182 if (stat(path, &s)) {
183 ERROR("Could not find firmware %s\n", path);
187 fw_data = malloc(s.st_size);
189 ERROR("Failed to allocate firmware data memory\n");
193 fw = open(path, O_RDONLY);
195 ERROR("Failed to open %s\n", path);
198 if (read(fw, fw_data, s.st_size) != s.st_size) {
199 ERROR("Failed to read firmware data\n");
204 snprintf(loadpath, sizeof(loadpath), "/sys/%s/loading", dev);
205 load = open(loadpath, O_WRONLY);
207 ERROR("Failed to open %s\n", loadpath);
213 snprintf(syspath, sizeof(syspath), "/sys/%s/data", dev);
214 sys = open(syspath, O_WRONLY);
216 ERROR("Failed to open %s\n", syspath);
222 write(fw, fw_data, 4096);
226 write(fw, fw_data, len);
229 load = open(loadpath, O_WRONLY);
233 DEBUG(1, "Done loading %s\n", path);
238 static struct cmd_handler {
241 void (*handler)(struct blob_attr *msg, struct blob_attr *data);
246 .handler = handle_makedev,
250 .handler = handle_rm,
253 .handler = handle_exec,
255 .name = "load-firmware",
256 .handler = handle_firmware,
260 static void queue_next(void)
264 if (queue_proc.pending || list_empty(&cmd_queue))
267 c = list_first_entry(&cmd_queue, struct cmd_queue, list);
269 queue_proc.pid = fork();
270 if (!queue_proc.pid) {
272 c->handler(c->msg, c->data);
279 if (queue_proc.pid <= 0) {
284 uloop_process_add(&queue_proc);
286 DEBUG(2, "Launched hotplug exec instance, pid=%d\n", (int) queue_proc.pid);
289 static void queue_proc_cb(struct uloop_process *c, int ret)
291 DEBUG(2, "Finished hotplug exec instance, pid=%d\n", (int) c->pid);
296 static void queue_add(struct cmd_handler *h, struct blob_attr *msg, struct blob_attr *data)
298 struct cmd_queue *c = NULL;
299 struct blob_attr *_msg, *_data;
301 c = calloc_a(sizeof(struct cmd_queue),
302 &_msg, blob_pad_len(msg),
303 &_data, blob_pad_len(data),
312 memcpy(c->msg, msg, blob_pad_len(msg));
313 memcpy(c->data, data, blob_pad_len(data));
314 c->handler = h->handler;
315 list_add_tail(&c->list, &cmd_queue);
319 static const char* rule_handle_var(struct json_script_ctx *ctx, const char *name, struct blob_attr *vars)
321 const char *str, *sep;
323 if (!strcmp(name, "DEVICENAME") || !strcmp(name, "DEVNAME")) {
324 str = json_script_find_var(ctx, vars, "DEVPATH");
328 sep = strrchr(str, '/');
338 static struct json_script_file *
339 rule_handle_file(struct json_script_ctx *ctx, const char *name)
343 obj = json_object_from_file((char*)name);
347 blob_buf_init(&script, 0);
348 blobmsg_add_json_element(&script, "", obj);
350 return json_script_file_from_blobmsg(name, blob_data(script.head), blob_len(script.head));
353 static void rule_handle_command(struct json_script_ctx *ctx, const char *name,
354 struct blob_attr *data, struct blob_attr *vars)
356 struct blob_attr *cur;
360 DEBUG(2, "Command: %s", name);
361 blobmsg_for_each_attr(cur, data, rem)
362 DEBUG(2, " %s", (char *) blobmsg_data(cur));
365 DEBUG(2, "Message:");
366 blobmsg_for_each_attr(cur, vars, rem)
367 DEBUG(2, " %s=%s", blobmsg_name(cur), (char *) blobmsg_data(cur));
371 for (i = 0; i < ARRAY_SIZE(handlers); i++)
372 if (!strcmp(handlers[i].name, name)) {
373 if (handlers[i].atomic)
374 handlers[i].handler(vars, data);
376 queue_add(&handlers[i], vars, data);
381 uloop_timeout_set(&last_event, HOTPLUG_WAIT);
384 static void rule_handle_error(struct json_script_ctx *ctx, const char *msg,
385 struct blob_attr *context)
389 s = blobmsg_format_json(context, false);
390 ERROR("ERROR: %s in block: %s\n", msg, s);
394 static struct json_script_ctx jctx = {
395 .handle_var = rule_handle_var,
396 .handle_error = rule_handle_error,
397 .handle_command = rule_handle_command,
398 .handle_file = rule_handle_file,
401 static void hotplug_handler(struct uloop_fd *u, unsigned int ev)
404 static char buf[4096];
405 int len = recv(u->fd, buf, sizeof(buf), MSG_DONTWAIT);
410 blob_buf_init(&b, 0);
411 index = blobmsg_open_table(&b, NULL);
413 int l = strlen(buf + i) + 1;
414 char *e = strstr(&buf[i], "=");
418 blobmsg_add_string(&b, &buf[i], &e[1]);
422 blobmsg_close_table(&b, index);
423 DEBUG(3, "%s\n", blobmsg_format_json(b.head, true));
424 json_script_run(&jctx, rule_file, blob_data(b.head));
427 static struct uloop_fd hotplug_fd = {
428 .cb = hotplug_handler,
431 void hotplug_last_event(uloop_timeout_handler handler)
433 last_event.cb = handler;
435 uloop_timeout_set(&last_event, HOTPLUG_WAIT);
437 uloop_timeout_cancel(&last_event);
440 void hotplug(char *rules)
442 struct sockaddr_nl nls;
444 rule_file = strdup(rules);
445 memset(&nls,0,sizeof(struct sockaddr_nl));
446 nls.nl_family = AF_NETLINK;
447 nls.nl_pid = getpid();
450 if ((hotplug_fd.fd = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT)) == -1) {
451 ERROR("Failed to open hotplug socket: %s\n", strerror(errno));
454 if (bind(hotplug_fd.fd, (void *)&nls, sizeof(struct sockaddr_nl))) {
455 ERROR("Failed to bind hotplug socket: %s\n", strerror(errno));
459 json_script_init(&jctx);
460 queue_proc.cb = queue_proc_cb;
461 uloop_fd_add(&hotplug_fd, ULOOP_READ);
464 void hotplug_shutdown(void)
466 uloop_fd_delete(&hotplug_fd);
467 close(hotplug_fd.fd);