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 handle_makedev(struct blob_attr
*msg
, struct blob_attr
*data
)
71 static struct blobmsg_policy mkdev_policy
[2] = {
72 { .type
= BLOBMSG_TYPE_STRING
},
73 { .type
= BLOBMSG_TYPE_STRING
},
75 struct blob_attr
*tb
[2];
76 char *minor
= hotplug_msg_find_var(msg
, "MINOR");
77 char *major
= hotplug_msg_find_var(msg
, "MAJOR");
78 char *subsystem
= hotplug_msg_find_var(msg
, "SUBSYSTEM");
80 blobmsg_parse_array(mkdev_policy
, 2, tb
, blobmsg_data(data
), blobmsg_data_len(data
));
81 if (tb
[0] && tb
[1] && minor
&& major
&& subsystem
) {
83 if (!strcmp(subsystem
, "block"))
85 mknod(blobmsg_get_string(tb
[0]),
86 m
| strtoul(blobmsg_data(tb
[1]), NULL
, 8),
87 makedev(atoi(major
), atoi(minor
)));
91 static void handle_rm(struct blob_attr
*msg
, struct blob_attr
*data
)
93 static struct blobmsg_policy rm_policy
= {
94 .type
= BLOBMSG_TYPE_STRING
,
98 blobmsg_parse_array(&rm_policy
, 1, &tb
, blobmsg_data(data
), blobmsg_data_len(data
));
100 unlink(blobmsg_data(tb
));
103 static void handle_exec(struct blob_attr
*msg
, struct blob_attr
*data
)
106 struct blob_attr
*cur
;
110 blobmsg_for_each_attr(cur
, msg
, rem
)
111 setenv(blobmsg_name(cur
), blobmsg_data(cur
), 1);
113 blobmsg_for_each_attr(cur
, data
, rem
) {
114 argv
[i
] = blobmsg_data(cur
);
122 close(STDOUT_FILENO
);
123 close(STDERR_FILENO
);
128 execvp(argv
[0], &argv
[0]);
133 static void handle_firmware(struct blob_attr
*msg
, struct blob_attr
*data
)
135 char *dir
= blobmsg_get_string(blobmsg_data(data
));
136 char *file
= hotplug_msg_find_var(msg
, "FIRMWARE");
137 char *dev
= hotplug_msg_find_var(msg
, "DEVPATH");
140 char *path
, loadpath
[256], syspath
[256];
141 int fw
, load
, sys
, len
;
143 DEBUG(1, "Firmware request for %s/%s\n", dir
, file
);
145 if (!file
|| !dir
|| !dev
) {
146 ERROR("Request for unknown firmware %s/%s\n", dir
, file
);
150 path
= malloc(strlen(dir
) + strlen(file
) + 2);
152 ERROR("Failed to allocate memory\n");
155 sprintf(path
, "%s/%s", dir
, file
);
157 if (stat(path
, &s
)) {
158 ERROR("Could not find firmware %s\n", path
);
162 fw_data
= malloc(s
.st_size
);
164 ERROR("Failed to allocate firmware data memory\n");
168 fw
= open(path
, O_RDONLY
);
170 ERROR("Failed to open %s\n", path
);
173 if (read(fw
, fw_data
, s
.st_size
) != s
.st_size
) {
174 ERROR("Failed to read firmware data\n");
179 snprintf(loadpath
, sizeof(loadpath
), "/sys/%s/loading", dev
);
180 load
= open(loadpath
, O_WRONLY
);
182 ERROR("Failed to open %s\n", loadpath
);
188 snprintf(syspath
, sizeof(syspath
), "/sys/%s/data", dev
);
189 sys
= open(syspath
, O_WRONLY
);
191 ERROR("Failed to open %s\n", syspath
);
197 write(fw
, fw_data
, 4096);
201 write(fw
, fw_data
, len
);
204 load
= open(loadpath
, O_WRONLY
);
208 DEBUG(1, "Done loading %s\n", path
);
213 static struct cmd_handler
{
216 void (*handler
)(struct blob_attr
*msg
, struct blob_attr
*data
);
221 .handler
= handle_makedev
,
225 .handler
= handle_rm
,
228 .handler
= handle_exec
,
230 .name
= "load-firmware",
231 .handler
= handle_firmware
,
235 static void queue_next(void)
239 if (queue_proc
.pending
|| list_empty(&cmd_queue
))
242 c
= list_first_entry(&cmd_queue
, struct cmd_queue
, list
);
244 queue_proc
.pid
= fork();
245 if (!queue_proc
.pid
) {
246 c
->handler(c
->msg
, c
->data
);
253 if (queue_proc
.pid
<= 0) {
258 uloop_process_add(&queue_proc
);
260 DEBUG(2, "Launched hotplug exec instance, pid=%d\n", (int) queue_proc
.pid
);
263 static void queue_proc_cb(struct uloop_process
*c
, int ret
)
265 DEBUG(2, "Finished hotplug exec instance, pid=%d\n", (int) c
->pid
);
270 static void queue_add(struct cmd_handler
*h
, struct blob_attr
*msg
, struct blob_attr
*data
)
272 struct cmd_queue
*c
= NULL
;
273 struct blob_attr
*_msg
, *_data
;
275 c
= calloc_a(sizeof(struct cmd_queue
),
276 &_msg
, blob_pad_len(msg
),
277 &_data
, blob_pad_len(data
),
286 memcpy(c
->msg
, msg
, blob_pad_len(msg
));
287 memcpy(c
->data
, data
, blob_pad_len(data
));
288 c
->handler
= h
->handler
;
289 list_add_tail(&c
->list
, &cmd_queue
);
293 static const char* rule_handle_var(struct json_script_ctx
*ctx
, const char *name
, struct blob_attr
*vars
)
295 const char *str
, *sep
;
297 if (!strcmp(name
, "DEVICENAME") || !strcmp(name
, "DEVNAME")) {
298 str
= json_script_find_var(ctx
, vars
, "DEVPATH");
302 sep
= strrchr(str
, '/');
312 static struct json_script_file
*
313 rule_handle_file(struct json_script_ctx
*ctx
, const char *name
)
317 obj
= json_object_from_file((char*)name
);
321 blob_buf_init(&script
, 0);
322 blobmsg_add_json_element(&script
, "", obj
);
324 return json_script_file_from_blobmsg(name
, blob_data(script
.head
), blob_len(script
.head
));
327 static void rule_handle_command(struct json_script_ctx
*ctx
, const char *name
,
328 struct blob_attr
*data
, struct blob_attr
*vars
)
330 struct blob_attr
*cur
;
334 DEBUG(2, "Command: %s", name
);
335 blobmsg_for_each_attr(cur
, data
, rem
)
336 DEBUG(2, " %s", (char *) blobmsg_data(cur
));
339 DEBUG(2, "Message:");
340 blobmsg_for_each_attr(cur
, vars
, rem
)
341 DEBUG(2, " %s=%s", blobmsg_name(cur
), (char *) blobmsg_data(cur
));
345 for (i
= 0; i
< ARRAY_SIZE(handlers
); i
++)
346 if (!strcmp(handlers
[i
].name
, name
)) {
347 if (handlers
[i
].atomic
)
348 handlers
[i
].handler(vars
, data
);
350 queue_add(&handlers
[i
], vars
, data
);
355 uloop_timeout_set(&last_event
, HOTPLUG_WAIT
);
358 static void rule_handle_error(struct json_script_ctx
*ctx
, const char *msg
,
359 struct blob_attr
*context
)
363 s
= blobmsg_format_json(context
, false);
364 ERROR("ERROR: %s in block: %s\n", msg
, s
);
368 static struct json_script_ctx jctx
= {
369 .handle_var
= rule_handle_var
,
370 .handle_error
= rule_handle_error
,
371 .handle_command
= rule_handle_command
,
372 .handle_file
= rule_handle_file
,
375 static void hotplug_handler(struct uloop_fd
*u
, unsigned int ev
)
378 static char buf
[4096];
379 int len
= recv(u
->fd
, buf
, sizeof(buf
), MSG_DONTWAIT
);
384 blob_buf_init(&b
, 0);
385 index
= blobmsg_open_table(&b
, NULL
);
387 int l
= strlen(buf
+ i
) + 1;
388 char *e
= strstr(&buf
[i
], "=");
392 blobmsg_add_string(&b
, &buf
[i
], &e
[1]);
396 blobmsg_close_table(&b
, index
);
397 DEBUG(3, "%s\n", blobmsg_format_json(b
.head
, true));
398 json_script_run(&jctx
, rule_file
, blob_data(b
.head
));
401 static struct uloop_fd hotplug_fd
= {
402 .cb
= hotplug_handler
,
405 void hotplug_last_event(uloop_timeout_handler handler
)
407 last_event
.cb
= handler
;
409 uloop_timeout_set(&last_event
, HOTPLUG_WAIT
);
411 uloop_timeout_cancel(&last_event
);
414 void hotplug(char *rules
)
416 struct sockaddr_nl nls
;
418 rule_file
= strdup(rules
);
419 memset(&nls
,0,sizeof(struct sockaddr_nl
));
420 nls
.nl_family
= AF_NETLINK
;
421 nls
.nl_pid
= getpid();
424 if ((hotplug_fd
.fd
= socket(PF_NETLINK
, SOCK_DGRAM
| SOCK_CLOEXEC
, NETLINK_KOBJECT_UEVENT
)) == -1) {
425 ERROR("Failed to open hotplug socket: %s\n", strerror(errno
));
428 if (bind(hotplug_fd
.fd
, (void *)&nls
, sizeof(struct sockaddr_nl
))) {
429 ERROR("Failed to bind hotplug socket: %s\n", strerror(errno
));
433 json_script_init(&jctx
);
434 queue_proc
.cb
= queue_proc_cb
;
435 uloop_fd_add(&hotplug_fd
, ULOOP_READ
);
438 void hotplug_shutdown(void)
440 uloop_fd_delete(&hotplug_fd
);
441 close(hotplug_fd
.fd
);