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>
18 #include <sys/sysmacros.h>
20 #include <linux/types.h>
21 #include <linux/netlink.h>
23 #include <libubox/blobmsg_json.h>
24 #include <libubox/json_script.h>
25 #include <libubox/uloop.h>
26 #include <json-c/json.h>
38 #define HOTPLUG_WAIT 500
42 struct list_head list
;
44 struct blob_attr
*msg
;
45 struct blob_attr
*data
;
48 void (*handler
)(struct blob_attr
*msg
, struct blob_attr
*data
);
49 void (*start
)(struct blob_attr
*msg
, struct blob_attr
*data
);
50 void (*complete
)(struct blob_attr
*msg
, struct blob_attr
*data
, int ret
);
53 struct button_timeout
{
54 struct list_head list
;
55 struct uloop_timeout timeout
;
58 struct blob_attr
*data
;
61 static LIST_HEAD(cmd_queue
);
62 static LIST_HEAD(button_timer
);
63 static struct uloop_process queue_proc
;
64 static struct uloop_timeout last_event
;
65 static struct blob_buf b
, button_buf
;
66 static char *rule_file
;
67 static struct blob_buf script
;
68 static struct cmd_queue
*current
;
70 static void queue_add(struct cmd_handler
*h
, struct blob_attr
*msg
, struct blob_attr
*data
);
71 static void handle_button_complete(struct blob_attr
*msg
, struct blob_attr
*data
, int ret
);
73 static void button_free(struct button_timeout
*b
)
75 uloop_timeout_cancel(&b
->timeout
);
82 static void button_timeout_remove(char *button
)
84 struct button_timeout
*b
, *c
;
86 if (!list_empty(&button_timer
)) list_for_each_entry_safe(b
, c
, &button_timer
, list
) {
87 if (!strcmp(b
->name
, button
))
92 static char *hotplug_msg_find_var(struct blob_attr
*msg
, const char *name
)
94 struct blob_attr
*cur
;
97 blobmsg_for_each_attr(cur
, msg
, rem
) {
98 if (blobmsg_type(cur
) != BLOBMSG_TYPE_STRING
)
101 if (strcmp(blobmsg_name(cur
), name
) != 0)
104 return blobmsg_data(cur
);
110 static void mkdir_p(char *dir
)
112 char *l
= strrchr(dir
, '/');
122 static void handle_makedev(struct blob_attr
*msg
, struct blob_attr
*data
)
124 unsigned int oldumask
= umask(0);
125 static struct blobmsg_policy mkdev_policy
[3] = {
126 { .type
= BLOBMSG_TYPE_STRING
},
127 { .type
= BLOBMSG_TYPE_STRING
},
128 { .type
= BLOBMSG_TYPE_STRING
},
130 struct blob_attr
*tb
[3];
131 char *minor
= hotplug_msg_find_var(msg
, "MINOR");
132 char *major
= hotplug_msg_find_var(msg
, "MAJOR");
133 char *subsystem
= hotplug_msg_find_var(msg
, "SUBSYSTEM");
136 blobmsg_parse_array(mkdev_policy
, 3, tb
, blobmsg_data(data
), blobmsg_data_len(data
));
137 if (tb
[0] && tb
[1] && minor
&& major
&& subsystem
) {
139 char *d
= strdup(blobmsg_get_string(tb
[0]));
145 if (!strcmp(subsystem
, "block"))
147 mknod(blobmsg_get_string(tb
[0]),
148 m
| strtoul(blobmsg_data(tb
[1]), NULL
, 8),
149 makedev(atoi(major
), atoi(minor
)));
151 struct group
*g
= getgrnam(blobmsg_get_string(tb
[2]));
154 ret
= chown(blobmsg_get_string(tb
[0]), 0, g
->gr_gid
);
157 ERROR("cannot set group %s for %s\n",
158 blobmsg_get_string(tb
[2]),
159 blobmsg_get_string(tb
[0]));
165 static void handle_rm(struct blob_attr
*msg
, struct blob_attr
*data
)
167 static struct blobmsg_policy rm_policy
= {
168 .type
= BLOBMSG_TYPE_STRING
,
170 struct blob_attr
*tb
;
172 blobmsg_parse_array(&rm_policy
, 1, &tb
, blobmsg_data(data
), blobmsg_data_len(data
));
174 unlink(blobmsg_data(tb
));
177 static void handle_exec(struct blob_attr
*msg
, struct blob_attr
*data
)
180 struct blob_attr
*cur
;
184 blobmsg_for_each_attr(cur
, msg
, rem
)
185 setenv(blobmsg_name(cur
), blobmsg_data(cur
), 1);
187 blobmsg_for_each_attr(cur
, data
, rem
) {
188 argv
[i
] = blobmsg_data(cur
);
195 fd
= open("/dev/null", O_RDWR
);
197 dup2(fd
, STDIN_FILENO
);
198 dup2(fd
, STDOUT_FILENO
);
199 dup2(fd
, STDERR_FILENO
);
200 if (fd
> STDERR_FILENO
)
207 execvp(argv
[0], &argv
[0]);
212 static void handle_button_start(struct blob_attr
*msg
, struct blob_attr
*data
)
214 char *button
= hotplug_msg_find_var(msg
, "BUTTON");
217 button_timeout_remove(button
);
220 static void handle_firmware(struct blob_attr
*msg
, struct blob_attr
*data
)
222 char *dir
= blobmsg_get_string(blobmsg_data(data
));
223 char *file
= hotplug_msg_find_var(msg
, "FIRMWARE");
224 char *dev
= hotplug_msg_find_var(msg
, "DEVPATH");
225 struct stat s
= { 0 };
226 char *path
, loadpath
[256], syspath
[256];
227 int fw
, src
, load
, len
;
228 static char buf
[4096];
230 DEBUG(2, "Firmware request for %s/%s\n", dir
, file
);
232 if (!file
|| !dir
|| !dev
) {
233 ERROR("Request for unknown firmware %s/%s\n", dir
, file
);
237 path
= alloca(strlen(dir
) + strlen(file
) + 2);
238 sprintf(path
, "%s/%s", dir
, file
);
240 if (stat(path
, &s
)) {
241 ERROR("Could not find firmware %s\n", path
);
247 src
= open(path
, O_RDONLY
);
249 ERROR("Failed to open %s\n", path
);
255 snprintf(loadpath
, sizeof(loadpath
), "/sys/%s/loading", dev
);
256 load
= open(loadpath
, O_WRONLY
);
258 ERROR("Failed to open %s\n", loadpath
);
261 if (write(load
, "1", 1) == -1) {
262 ERROR("Failed to write to %s\n", loadpath
);
267 snprintf(syspath
, sizeof(syspath
), "/sys/%s/data", dev
);
268 fw
= open(syspath
, O_WRONLY
);
270 ERROR("Failed to open %s\n", syspath
);
276 len
= read(src
, buf
, sizeof(buf
));
280 if (write(fw
, buf
, len
) == -1) {
281 ERROR("failed to write firmware file %s/%s to %s\n", dir
, file
, dev
);
290 load
= open(loadpath
, O_WRONLY
);
291 if (write(load
, "0", 1) == -1)
292 ERROR("failed to write to %s\n", loadpath
);
295 DEBUG(2, "Done loading %s\n", path
);
308 static struct cmd_handler
{
311 void (*handler
)(struct blob_attr
*msg
, struct blob_attr
*data
);
312 void (*start
)(struct blob_attr
*msg
, struct blob_attr
*data
);
313 void (*complete
)(struct blob_attr
*msg
, struct blob_attr
*data
, int ret
);
318 .handler
= handle_makedev
,
323 .handler
= handle_rm
,
327 .handler
= handle_exec
,
331 .handler
= handle_exec
,
332 .start
= handle_button_start
,
333 .complete
= handle_button_complete
,
336 .name
= "load-firmware",
337 .handler
= handle_firmware
,
341 static void queue_next(void)
345 if (queue_proc
.pending
|| list_empty(&cmd_queue
))
348 c
= list_first_entry(&cmd_queue
, struct cmd_queue
, list
);
350 queue_proc
.pid
= fork();
351 if (!queue_proc
.pid
) {
353 c
->handler(c
->msg
, c
->data
);
357 c
->start(c
->msg
, c
->data
);
363 if (queue_proc
.pid
<= 0) {
368 uloop_process_add(&queue_proc
);
370 DEBUG(4, "Launched hotplug exec instance, pid=%d\n", (int) queue_proc
.pid
);
373 static void queue_proc_cb(struct uloop_process
*c
, int ret
)
375 DEBUG(4, "Finished hotplug exec instance, pid=%d\n", (int) c
->pid
);
378 current
->complete(current
->msg
, current
->data
, ret
);
385 static void queue_add(struct cmd_handler
*h
, struct blob_attr
*msg
, struct blob_attr
*data
)
387 struct cmd_queue
*c
= NULL
;
388 struct blob_attr
*_msg
, *_data
;
390 c
= calloc_a(sizeof(struct cmd_queue
),
391 &_msg
, blob_pad_len(msg
),
392 &_data
, blob_pad_len(data
),
401 memcpy(c
->msg
, msg
, blob_pad_len(msg
));
402 memcpy(c
->data
, data
, blob_pad_len(data
));
403 c
->handler
= h
->handler
;
404 c
->complete
= h
->complete
;
406 list_add_tail(&c
->list
, &cmd_queue
);
410 static void handle_button_timeout(struct uloop_timeout
*t
)
412 struct button_timeout
*b
;
415 b
= container_of(t
, struct button_timeout
, timeout
);
416 blob_buf_init(&button_buf
, 0);
417 blobmsg_add_string(&button_buf
, "BUTTON", b
->name
);
418 blobmsg_add_string(&button_buf
, "ACTION", "timeout");
419 snprintf(seen
, sizeof(seen
), "%d", b
->seen
);
420 blobmsg_add_string(&button_buf
, "SEEN", seen
);
421 queue_add(&handlers
[HANDLER_EXEC
], button_buf
.head
, b
->data
);
425 static void handle_button_complete(struct blob_attr
*msg
, struct blob_attr
*data
, int ret
)
427 char *name
= hotplug_msg_find_var(msg
, "BUTTON");
428 struct button_timeout
*b
;
429 int timeout
= ret
>> 8;
434 b
= malloc(sizeof(*b
));
438 memset(b
, 0, sizeof(*b
));
440 b
->data
= malloc(blob_pad_len(data
));
441 b
->name
= strdup(name
);
444 memcpy(b
->data
, data
, blob_pad_len(data
));
445 b
->timeout
.cb
= handle_button_timeout
;
447 uloop_timeout_set(&b
->timeout
, timeout
* 1000);
448 list_add(&b
->list
, &button_timer
);
451 static const char* rule_handle_var(struct json_script_ctx
*ctx
, const char *name
, struct blob_attr
*vars
)
453 const char *str
, *sep
;
455 if (!strcmp(name
, "DEVICENAME") || !strcmp(name
, "DEVNAME")) {
456 str
= json_script_find_var(ctx
, vars
, "DEVPATH");
460 sep
= strrchr(str
, '/');
470 static struct json_script_file
*
471 rule_handle_file(struct json_script_ctx
*ctx
, const char *name
)
475 obj
= json_object_from_file((char*)name
);
479 blob_buf_init(&script
, 0);
480 blobmsg_add_json_element(&script
, "", obj
);
482 return json_script_file_from_blobmsg(name
, blob_data(script
.head
), blob_len(script
.head
));
485 static void rule_handle_command(struct json_script_ctx
*ctx
, const char *name
,
486 struct blob_attr
*data
, struct blob_attr
*vars
)
488 struct blob_attr
*cur
;
492 DEBUG(4, "Command: %s", name
);
493 blobmsg_for_each_attr(cur
, data
, rem
)
494 DEBUG(4, " %s", (char *) blobmsg_data(cur
));
497 DEBUG(4, "Message:");
498 blobmsg_for_each_attr(cur
, vars
, rem
)
499 DEBUG(4, " %s=%s", blobmsg_name(cur
), (char *) blobmsg_data(cur
));
503 for (i
= 0; i
< ARRAY_SIZE(handlers
); i
++)
504 if (!strcmp(handlers
[i
].name
, name
)) {
505 if (handlers
[i
].atomic
)
506 handlers
[i
].handler(vars
, data
);
508 queue_add(&handlers
[i
], vars
, data
);
513 uloop_timeout_set(&last_event
, HOTPLUG_WAIT
);
516 static void rule_handle_error(struct json_script_ctx
*ctx
, const char *msg
,
517 struct blob_attr
*context
)
521 s
= blobmsg_format_json(context
, false);
522 ERROR("ERROR: %s in block: %s\n", msg
, s
);
526 static struct json_script_ctx jctx
= {
527 .handle_var
= rule_handle_var
,
528 .handle_error
= rule_handle_error
,
529 .handle_command
= rule_handle_command
,
530 .handle_file
= rule_handle_file
,
533 static void hotplug_handler_debug(struct blob_attr
*data
)
540 str
= blobmsg_format_json(data
, true);
541 DEBUG(3, "%s\n", str
);
545 static void hotplug_handler(struct uloop_fd
*u
, unsigned int ev
)
548 static char buf
[4096];
549 int len
= recv(u
->fd
, buf
, sizeof(buf
), MSG_DONTWAIT
);
554 blob_buf_init(&b
, 0);
555 index
= blobmsg_open_table(&b
, NULL
);
557 int l
= strlen(buf
+ i
) + 1;
558 char *e
= strstr(&buf
[i
], "=");
562 blobmsg_add_string(&b
, &buf
[i
], &e
[1]);
566 blobmsg_close_table(&b
, index
);
567 hotplug_handler_debug(b
.head
);
568 json_script_run(&jctx
, rule_file
, blob_data(b
.head
));
571 static struct uloop_fd hotplug_fd
= {
572 .cb
= hotplug_handler
,
575 void hotplug_last_event(uloop_timeout_handler handler
)
577 last_event
.cb
= handler
;
579 uloop_timeout_set(&last_event
, HOTPLUG_WAIT
);
581 uloop_timeout_cancel(&last_event
);
584 void hotplug(char *rules
)
586 struct sockaddr_nl nls
;
587 int nlbufsize
= 512 * 1024;
589 rule_file
= strdup(rules
);
590 memset(&nls
,0,sizeof(struct sockaddr_nl
));
591 nls
.nl_family
= AF_NETLINK
;
592 nls
.nl_pid
= getpid();
595 if ((hotplug_fd
.fd
= socket(PF_NETLINK
, SOCK_DGRAM
| SOCK_CLOEXEC
, NETLINK_KOBJECT_UEVENT
)) == -1) {
596 ERROR("Failed to open hotplug socket: %s\n", strerror(errno
));
599 if (bind(hotplug_fd
.fd
, (void *)&nls
, sizeof(struct sockaddr_nl
))) {
600 ERROR("Failed to bind hotplug socket: %s\n", strerror(errno
));
604 if (setsockopt(hotplug_fd
.fd
, SOL_SOCKET
, SO_RCVBUFFORCE
, &nlbufsize
, sizeof(nlbufsize
)))
605 ERROR("Failed to resize receive buffer: %s\n", strerror(errno
));
607 json_script_init(&jctx
);
608 queue_proc
.cb
= queue_proc_cb
;
609 uloop_fd_add(&hotplug_fd
, ULOOP_READ
);
612 int hotplug_run(char *rules
)
621 void hotplug_shutdown(void)
623 uloop_fd_delete(&hotplug_fd
);
624 close(hotplug_fd
.fd
);