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 static struct blobmsg_policy mkdev_policy[2] = {
84 { .type = BLOBMSG_TYPE_STRING },
85 { .type = BLOBMSG_TYPE_STRING },
87 struct blob_attr *tb[2];
88 char *minor = hotplug_msg_find_var(msg, "MINOR");
89 char *major = hotplug_msg_find_var(msg, "MAJOR");
90 char *subsystem = hotplug_msg_find_var(msg, "SUBSYSTEM");
92 blobmsg_parse_array(mkdev_policy, 2, tb, blobmsg_data(data), blobmsg_data_len(data));
93 if (tb[0] && tb[1] && minor && major && subsystem) {
95 char *d = strdup(blobmsg_get_string(tb[0]));
101 if (!strcmp(subsystem, "block"))
103 mknod(blobmsg_get_string(tb[0]),
104 m | strtoul(blobmsg_data(tb[1]), NULL, 8),
105 makedev(atoi(major), atoi(minor)));
109 static void handle_rm(struct blob_attr *msg, struct blob_attr *data)
111 static struct blobmsg_policy rm_policy = {
112 .type = BLOBMSG_TYPE_STRING,
114 struct blob_attr *tb;
116 blobmsg_parse_array(&rm_policy, 1, &tb, blobmsg_data(data), blobmsg_data_len(data));
118 unlink(blobmsg_data(tb));
121 static void handle_exec(struct blob_attr *msg, struct blob_attr *data)
124 struct blob_attr *cur;
128 blobmsg_for_each_attr(cur, msg, rem)
129 setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
131 blobmsg_for_each_attr(cur, data, rem) {
132 argv[i] = blobmsg_data(cur);
140 close(STDOUT_FILENO);
141 close(STDERR_FILENO);
146 execvp(argv[0], &argv[0]);
151 static void handle_firmware(struct blob_attr *msg, struct blob_attr *data)
153 char *dir = blobmsg_get_string(blobmsg_data(data));
154 char *file = hotplug_msg_find_var(msg, "FIRMWARE");
155 char *dev = hotplug_msg_find_var(msg, "DEVPATH");
158 char *path, loadpath[256], syspath[256];
159 int fw, load, sys, len;
161 DEBUG(1, "Firmware request for %s/%s\n", dir, file);
163 if (!file || !dir || !dev) {
164 ERROR("Request for unknown firmware %s/%s\n", dir, file);
168 path = malloc(strlen(dir) + strlen(file) + 2);
170 ERROR("Failed to allocate memory\n");
173 sprintf(path, "%s/%s", dir, file);
175 if (stat(path, &s)) {
176 ERROR("Could not find firmware %s\n", path);
180 fw_data = malloc(s.st_size);
182 ERROR("Failed to allocate firmware data memory\n");
186 fw = open(path, O_RDONLY);
188 ERROR("Failed to open %s\n", path);
191 if (read(fw, fw_data, s.st_size) != s.st_size) {
192 ERROR("Failed to read firmware data\n");
197 snprintf(loadpath, sizeof(loadpath), "/sys/%s/loading", dev);
198 load = open(loadpath, O_WRONLY);
200 ERROR("Failed to open %s\n", loadpath);
206 snprintf(syspath, sizeof(syspath), "/sys/%s/data", dev);
207 sys = open(syspath, O_WRONLY);
209 ERROR("Failed to open %s\n", syspath);
215 write(fw, fw_data, 4096);
219 write(fw, fw_data, len);
222 load = open(loadpath, O_WRONLY);
226 DEBUG(1, "Done loading %s\n", path);
231 static struct cmd_handler {
234 void (*handler)(struct blob_attr *msg, struct blob_attr *data);
239 .handler = handle_makedev,
243 .handler = handle_rm,
246 .handler = handle_exec,
248 .name = "load-firmware",
249 .handler = handle_firmware,
253 static void queue_next(void)
257 if (queue_proc.pending || list_empty(&cmd_queue))
260 c = list_first_entry(&cmd_queue, struct cmd_queue, list);
262 queue_proc.pid = fork();
263 if (!queue_proc.pid) {
264 c->handler(c->msg, c->data);
271 if (queue_proc.pid <= 0) {
276 uloop_process_add(&queue_proc);
278 DEBUG(2, "Launched hotplug exec instance, pid=%d\n", (int) queue_proc.pid);
281 static void queue_proc_cb(struct uloop_process *c, int ret)
283 DEBUG(2, "Finished hotplug exec instance, pid=%d\n", (int) c->pid);
288 static void queue_add(struct cmd_handler *h, struct blob_attr *msg, struct blob_attr *data)
290 struct cmd_queue *c = NULL;
291 struct blob_attr *_msg, *_data;
293 c = calloc_a(sizeof(struct cmd_queue),
294 &_msg, blob_pad_len(msg),
295 &_data, blob_pad_len(data),
304 memcpy(c->msg, msg, blob_pad_len(msg));
305 memcpy(c->data, data, blob_pad_len(data));
306 c->handler = h->handler;
307 list_add_tail(&c->list, &cmd_queue);
311 static const char* rule_handle_var(struct json_script_ctx *ctx, const char *name, struct blob_attr *vars)
313 const char *str, *sep;
315 if (!strcmp(name, "DEVICENAME") || !strcmp(name, "DEVNAME")) {
316 str = json_script_find_var(ctx, vars, "DEVPATH");
320 sep = strrchr(str, '/');
330 static struct json_script_file *
331 rule_handle_file(struct json_script_ctx *ctx, const char *name)
335 obj = json_object_from_file((char*)name);
339 blob_buf_init(&script, 0);
340 blobmsg_add_json_element(&script, "", obj);
342 return json_script_file_from_blobmsg(name, blob_data(script.head), blob_len(script.head));
345 static void rule_handle_command(struct json_script_ctx *ctx, const char *name,
346 struct blob_attr *data, struct blob_attr *vars)
348 struct blob_attr *cur;
352 DEBUG(2, "Command: %s", name);
353 blobmsg_for_each_attr(cur, data, rem)
354 DEBUG(2, " %s", (char *) blobmsg_data(cur));
357 DEBUG(2, "Message:");
358 blobmsg_for_each_attr(cur, vars, rem)
359 DEBUG(2, " %s=%s", blobmsg_name(cur), (char *) blobmsg_data(cur));
363 for (i = 0; i < ARRAY_SIZE(handlers); i++)
364 if (!strcmp(handlers[i].name, name)) {
365 if (handlers[i].atomic)
366 handlers[i].handler(vars, data);
368 queue_add(&handlers[i], vars, data);
373 uloop_timeout_set(&last_event, HOTPLUG_WAIT);
376 static void rule_handle_error(struct json_script_ctx *ctx, const char *msg,
377 struct blob_attr *context)
381 s = blobmsg_format_json(context, false);
382 ERROR("ERROR: %s in block: %s\n", msg, s);
386 static struct json_script_ctx jctx = {
387 .handle_var = rule_handle_var,
388 .handle_error = rule_handle_error,
389 .handle_command = rule_handle_command,
390 .handle_file = rule_handle_file,
393 static void hotplug_handler(struct uloop_fd *u, unsigned int ev)
396 static char buf[4096];
397 int len = recv(u->fd, buf, sizeof(buf), MSG_DONTWAIT);
402 blob_buf_init(&b, 0);
403 index = blobmsg_open_table(&b, NULL);
405 int l = strlen(buf + i) + 1;
406 char *e = strstr(&buf[i], "=");
410 blobmsg_add_string(&b, &buf[i], &e[1]);
414 blobmsg_close_table(&b, index);
415 DEBUG(3, "%s\n", blobmsg_format_json(b.head, true));
416 json_script_run(&jctx, rule_file, blob_data(b.head));
419 static struct uloop_fd hotplug_fd = {
420 .cb = hotplug_handler,
423 void hotplug_last_event(uloop_timeout_handler handler)
425 last_event.cb = handler;
427 uloop_timeout_set(&last_event, HOTPLUG_WAIT);
429 uloop_timeout_cancel(&last_event);
432 void hotplug(char *rules)
434 struct sockaddr_nl nls;
436 rule_file = strdup(rules);
437 memset(&nls,0,sizeof(struct sockaddr_nl));
438 nls.nl_family = AF_NETLINK;
439 nls.nl_pid = getpid();
442 if ((hotplug_fd.fd = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT)) == -1) {
443 ERROR("Failed to open hotplug socket: %s\n", strerror(errno));
446 if (bind(hotplug_fd.fd, (void *)&nls, sizeof(struct sockaddr_nl))) {
447 ERROR("Failed to bind hotplug socket: %s\n", strerror(errno));
451 json_script_init(&jctx);
452 queue_proc.cb = queue_proc_cb;
453 uloop_fd_add(&hotplug_fd, ULOOP_READ);
456 void hotplug_shutdown(void)
458 uloop_fd_delete(&hotplug_fd);
459 close(hotplug_fd.fd);