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 static const struct blob_attr_info ubus_policy
[UBUS_ATTR_MAX
] = {
32 [UBUS_ATTR_STATUS
] = { .type
= BLOB_ATTR_INT32
},
33 [UBUS_ATTR_OBJID
] = { .type
= BLOB_ATTR_INT32
},
34 [UBUS_ATTR_OBJPATH
] = { .type
= BLOB_ATTR_STRING
},
35 [UBUS_ATTR_METHOD
] = { .type
= BLOB_ATTR_STRING
},
36 [UBUS_ATTR_ACTIVE
] = { .type
= BLOB_ATTR_INT8
},
37 [UBUS_ATTR_NO_REPLY
] = { .type
= BLOB_ATTR_INT8
},
38 [UBUS_ATTR_SUBSCRIBERS
] = { .type
= BLOB_ATTR_NESTED
},
41 static struct blob_attr
*attrbuf
[UBUS_ATTR_MAX
];
43 __hidden
struct blob_attr
**ubus_parse_msg(struct blob_attr
*msg
)
45 blob_parse(msg
, attrbuf
, ubus_policy
, UBUS_ATTR_MAX
);
49 static void wait_data(int fd
, bool write
)
51 struct pollfd pfd
= { .fd
= fd
};
53 pfd
.events
= write
? POLLOUT
: POLLIN
;
57 static int writev_retry(int fd
, struct iovec
*iov
, int iov_len
, int sock_fd
)
64 .cmsg_len
= sizeof(fd_buf
),
65 .cmsg_level
= SOL_SOCKET
,
66 .cmsg_type
= SCM_RIGHTS
,
69 struct msghdr msghdr
= {
71 .msg_iovlen
= iov_len
,
72 .msg_control
= &fd_buf
,
73 .msg_controllen
= sizeof(fd_buf
),
81 msghdr
.msg_control
= NULL
;
82 msghdr
.msg_controllen
= 0;
87 cur_len
= sendmsg(fd
, &msghdr
, 0);
105 while (cur_len
>= iov
->iov_len
) {
106 cur_len
-= iov
->iov_len
;
112 iov
->iov_len
-= cur_len
;
115 /* Should never reach here */
119 int __hidden
ubus_send_msg(struct ubus_context
*ctx
, uint32_t seq
,
120 struct blob_attr
*msg
, int cmd
, uint32_t peer
, int fd
)
122 struct ubus_msghdr hdr
;
123 struct iovec iov
[2] = {
134 blob_buf_init(&b
, 0);
138 iov
[1].iov_base
= (char *) msg
;
139 iov
[1].iov_len
= blob_raw_len(msg
);
141 ret
= writev_retry(ctx
->sock
.fd
, iov
, ARRAY_SIZE(iov
), fd
);
143 ctx
->sock
.eof
= true;
148 static int recv_retry(int fd
, struct iovec
*iov
, bool wait
, int *recv_fd
)
150 int bytes
, total
= 0;
156 .cmsg_type
= SCM_RIGHTS
,
157 .cmsg_level
= SOL_SOCKET
,
158 .cmsg_len
= sizeof(fd_buf
),
161 struct msghdr msghdr
= {
166 while (iov
->iov_len
> 0) {
168 wait_data(fd
, false);
171 msghdr
.msg_control
= &fd_buf
;
172 msghdr
.msg_controllen
= sizeof(fd_buf
);
174 msghdr
.msg_control
= NULL
;
175 msghdr
.msg_controllen
= 0;
179 bytes
= recvmsg(fd
, &msghdr
, 0);
197 *recv_fd
= fd_buf
.fd
;
202 iov
->iov_len
-= bytes
;
203 iov
->iov_base
+= bytes
;
210 static bool ubus_validate_hdr(struct ubus_msghdr
*hdr
)
212 struct blob_attr
*data
= ubus_msghdr_data(hdr
);
214 if (hdr
->version
!= 0)
217 if (blob_raw_len(data
) < sizeof(*data
))
220 if (blob_pad_len(data
) > UBUS_MAX_MSGLEN
)
226 static bool get_next_msg(struct ubus_context
*ctx
, int *recv_fd
)
228 struct iovec iov
= STATIC_IOV(ctx
->msgbuf
.hdr
);
231 /* receive header + start attribute */
232 iov
.iov_len
+= sizeof(struct blob_attr
);
233 r
= recv_retry(ctx
->sock
.fd
, &iov
, false, recv_fd
);
236 ctx
->sock
.eof
= true;
241 iov
.iov_len
= blob_len(ubus_msghdr_data(&ctx
->msgbuf
.hdr
));
242 if (iov
.iov_len
> 0 && !recv_retry(ctx
->sock
.fd
, &iov
, true, NULL
))
245 return ubus_validate_hdr(&ctx
->msgbuf
.hdr
);
248 void __hidden
ubus_handle_data(struct uloop_fd
*u
, unsigned int events
)
250 struct ubus_context
*ctx
= container_of(u
, struct ubus_context
, sock
);
251 struct ubus_msghdr
*hdr
= &ctx
->msgbuf
.hdr
;
254 while (get_next_msg(ctx
, &recv_fd
)) {
255 ubus_process_msg(ctx
, hdr
, recv_fd
);
261 ctx
->connection_lost(ctx
);
265 ubus_refresh_state(struct ubus_context
*ctx
)
267 struct ubus_object
*obj
, *tmp
;
268 struct ubus_object
**objs
;
271 /* clear all type IDs, they need to be registered again */
272 avl_for_each_element(&ctx
->objects
, obj
, avl
)
276 /* push out all objects again */
277 objs
= alloca(ctx
->objects
.count
* sizeof(*objs
));
278 avl_remove_all_elements(&ctx
->objects
, obj
, avl
, tmp
) {
283 for (n
= i
, i
= 0; i
< n
; i
++)
284 ubus_add_object(ctx
, objs
[i
]);
287 int ubus_reconnect(struct ubus_context
*ctx
, const char *path
)
290 struct ubus_msghdr hdr
;
291 struct blob_attr data
;
293 struct blob_attr
*buf
;
294 int ret
= UBUS_STATUS_UNKNOWN_ERROR
;
297 path
= UBUS_UNIX_SOCKET
;
299 if (ctx
->sock
.fd
>= 0) {
300 if (ctx
->sock
.registered
)
301 uloop_fd_delete(&ctx
->sock
);
306 ctx
->sock
.fd
= usock(USOCK_UNIX
, path
, NULL
);
307 if (ctx
->sock
.fd
< 0)
308 return UBUS_STATUS_CONNECTION_FAILED
;
310 if (read(ctx
->sock
.fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
313 if (!ubus_validate_hdr(&hdr
.hdr
))
316 if (hdr
.hdr
.type
!= UBUS_MSG_HELLO
)
319 buf
= calloc(1, blob_raw_len(&hdr
.data
));
323 memcpy(buf
, &hdr
.data
, sizeof(hdr
.data
));
324 if (read(ctx
->sock
.fd
, blob_data(buf
), blob_len(buf
)) != blob_len(buf
))
327 ctx
->local_id
= hdr
.hdr
.peer
;
331 ret
= UBUS_STATUS_OK
;
332 fcntl(ctx
->sock
.fd
, F_SETFL
, fcntl(ctx
->sock
.fd
, F_GETFL
) | O_NONBLOCK
);
334 ubus_refresh_state(ctx
);