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
);