2 * Copyright (C) 2011-2014 Felix Fietkau <nbd@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <sys/types.h>
16 #include <sys/socket.h>
22 #include <libubox/usock.h>
23 #include <libubox/blob.h>
24 #include <libubox/blobmsg.h>
27 #include "libubus-internal.h"
29 #define STATIC_IOV(_var) { .iov_base = (char *) &(_var), .iov_len = sizeof(_var) }
31 #define UBUS_MSGBUF_REDUCTION_INTERVAL 16
33 static const struct blob_attr_info ubus_policy
[UBUS_ATTR_MAX
] = {
34 [UBUS_ATTR_STATUS
] = { .type
= BLOB_ATTR_INT32
},
35 [UBUS_ATTR_OBJID
] = { .type
= BLOB_ATTR_INT32
},
36 [UBUS_ATTR_OBJPATH
] = { .type
= BLOB_ATTR_STRING
},
37 [UBUS_ATTR_METHOD
] = { .type
= BLOB_ATTR_STRING
},
38 [UBUS_ATTR_ACTIVE
] = { .type
= BLOB_ATTR_INT8
},
39 [UBUS_ATTR_NO_REPLY
] = { .type
= BLOB_ATTR_INT8
},
40 [UBUS_ATTR_SUBSCRIBERS
] = { .type
= BLOB_ATTR_NESTED
},
43 static struct blob_attr
*attrbuf
[UBUS_ATTR_MAX
];
45 __hidden
struct blob_attr
**ubus_parse_msg(struct blob_attr
*msg
)
47 blob_parse(msg
, attrbuf
, ubus_policy
, UBUS_ATTR_MAX
);
51 static void wait_data(int fd
, bool write
)
53 struct pollfd pfd
= { .fd
= fd
};
55 pfd
.events
= write
? POLLOUT
: POLLIN
;
59 static int writev_retry(int fd
, struct iovec
*iov
, int iov_len
, int sock_fd
)
66 .cmsg_len
= sizeof(fd_buf
),
67 .cmsg_level
= SOL_SOCKET
,
68 .cmsg_type
= SCM_RIGHTS
,
71 struct msghdr msghdr
= {
73 .msg_iovlen
= iov_len
,
74 .msg_control
= &fd_buf
,
75 .msg_controllen
= sizeof(fd_buf
),
83 msghdr
.msg_control
= NULL
;
84 msghdr
.msg_controllen
= 0;
89 cur_len
= sendmsg(fd
, &msghdr
, 0);
107 while (cur_len
>= iov
->iov_len
) {
108 cur_len
-= iov
->iov_len
;
114 iov
->iov_len
-= cur_len
;
117 /* Should never reach here */
121 int __hidden
ubus_send_msg(struct ubus_context
*ctx
, uint32_t seq
,
122 struct blob_attr
*msg
, int cmd
, uint32_t peer
, int fd
)
124 struct ubus_msghdr hdr
;
125 struct iovec iov
[2] = {
136 blob_buf_init(&b
, 0);
140 iov
[1].iov_base
= (char *) msg
;
141 iov
[1].iov_len
= blob_raw_len(msg
);
143 ret
= writev_retry(ctx
->sock
.fd
, iov
, ARRAY_SIZE(iov
), fd
);
145 ctx
->sock
.eof
= true;
153 static int recv_retry(int fd
, struct iovec
*iov
, bool wait
, int *recv_fd
)
155 int bytes
, total
= 0;
161 .cmsg_type
= SCM_RIGHTS
,
162 .cmsg_level
= SOL_SOCKET
,
163 .cmsg_len
= sizeof(fd_buf
),
166 struct msghdr msghdr
= {
171 while (iov
->iov_len
> 0) {
173 wait_data(fd
, false);
176 msghdr
.msg_control
= &fd_buf
;
177 msghdr
.msg_controllen
= sizeof(fd_buf
);
179 msghdr
.msg_control
= NULL
;
180 msghdr
.msg_controllen
= 0;
184 bytes
= recvmsg(fd
, &msghdr
, 0);
202 *recv_fd
= fd_buf
.fd
;
207 iov
->iov_len
-= bytes
;
208 iov
->iov_base
+= bytes
;
215 static bool ubus_validate_hdr(struct ubus_msghdr
*hdr
)
217 struct blob_attr
*data
= (struct blob_attr
*) (hdr
+ 1);
219 if (hdr
->version
!= 0)
222 if (blob_raw_len(data
) < sizeof(*data
))
225 if (blob_pad_len(data
) > UBUS_MAX_MSGLEN
)
231 static bool get_next_msg(struct ubus_context
*ctx
, int *recv_fd
)
234 struct ubus_msghdr hdr
;
235 struct blob_attr data
;
237 struct iovec iov
= STATIC_IOV(hdrbuf
);
241 /* receive header + start attribute */
242 r
= recv_retry(ctx
->sock
.fd
, &iov
, false, recv_fd
);
245 ctx
->sock
.eof
= true;
250 if (!ubus_validate_hdr(&hdrbuf
.hdr
))
253 len
= blob_raw_len(&hdrbuf
.data
);
254 if (len
> ctx
->msgbuf_data_len
) {
255 ctx
->msgbuf_reduction_counter
= UBUS_MSGBUF_REDUCTION_INTERVAL
;
256 } else if (ctx
->msgbuf_data_len
> UBUS_MSG_CHUNK_SIZE
) {
257 if (ctx
->msgbuf_reduction_counter
> 0) {
259 --ctx
->msgbuf_reduction_counter
;
261 len
= UBUS_MSG_CHUNK_SIZE
;
266 ctx
->msgbuf
.data
= realloc(ctx
->msgbuf
.data
, len
* sizeof(char));
267 if (ctx
->msgbuf
.data
)
268 ctx
->msgbuf_data_len
= len
;
270 if (!ctx
->msgbuf
.data
)
273 memcpy(&ctx
->msgbuf
.hdr
, &hdrbuf
.hdr
, sizeof(hdrbuf
.hdr
));
274 memcpy(ctx
->msgbuf
.data
, &hdrbuf
.data
, sizeof(hdrbuf
.data
));
276 iov
.iov_base
= (char *)ctx
->msgbuf
.data
+ sizeof(hdrbuf
.data
);
277 iov
.iov_len
= blob_len(ctx
->msgbuf
.data
);
278 if (iov
.iov_len
> 0 && !recv_retry(ctx
->sock
.fd
, &iov
, true, NULL
))
284 void __hidden
ubus_handle_data(struct uloop_fd
*u
, unsigned int events
)
286 struct ubus_context
*ctx
= container_of(u
, struct ubus_context
, sock
);
287 struct ubus_msghdr
*hdr
= &ctx
->msgbuf
.hdr
;
290 while (get_next_msg(ctx
, &recv_fd
)) {
291 ubus_process_msg(ctx
, hdr
, recv_fd
);
297 ctx
->connection_lost(ctx
);
300 void __hidden
ubus_poll_data(struct ubus_context
*ctx
, int timeout
)
302 struct pollfd pfd
= {
304 .events
= POLLIN
| POLLERR
,
307 poll(&pfd
, 1, timeout
);
308 ubus_handle_data(&ctx
->sock
, ULOOP_READ
);
312 ubus_refresh_state(struct ubus_context
*ctx
)
314 struct ubus_object
*obj
, *tmp
;
315 struct ubus_object
**objs
;
318 /* clear all type IDs, they need to be registered again */
319 avl_for_each_element(&ctx
->objects
, obj
, avl
)
323 /* push out all objects again */
324 objs
= alloca(ctx
->objects
.count
* sizeof(*objs
));
325 avl_remove_all_elements(&ctx
->objects
, obj
, avl
, tmp
) {
330 for (n
= i
, i
= 0; i
< n
; i
++)
331 ubus_add_object(ctx
, objs
[i
]);
334 int ubus_reconnect(struct ubus_context
*ctx
, const char *path
)
337 struct ubus_msghdr hdr
;
338 struct blob_attr data
;
340 struct blob_attr
*buf
;
341 int ret
= UBUS_STATUS_UNKNOWN_ERROR
;
344 path
= UBUS_UNIX_SOCKET
;
346 if (ctx
->sock
.fd
>= 0) {
347 if (ctx
->sock
.registered
)
348 uloop_fd_delete(&ctx
->sock
);
353 ctx
->sock
.fd
= usock(USOCK_UNIX
, path
, NULL
);
354 if (ctx
->sock
.fd
< 0)
355 return UBUS_STATUS_CONNECTION_FAILED
;
357 if (read(ctx
->sock
.fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
360 if (!ubus_validate_hdr(&hdr
.hdr
))
363 if (hdr
.hdr
.type
!= UBUS_MSG_HELLO
)
366 buf
= calloc(1, blob_raw_len(&hdr
.data
));
370 memcpy(buf
, &hdr
.data
, sizeof(hdr
.data
));
371 if (read(ctx
->sock
.fd
, blob_data(buf
), blob_len(buf
)) != blob_len(buf
))
374 ctx
->local_id
= hdr
.hdr
.peer
;
378 ret
= UBUS_STATUS_OK
;
379 fcntl(ctx
->sock
.fd
, F_SETFL
, fcntl(ctx
->sock
.fd
, F_GETFL
) | O_NONBLOCK
);
381 ubus_refresh_state(ctx
);