2 * Copyright (C) 2011-2012 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
)
62 int cur_len
= writev(fd
, iov
, iov_len
);
76 while (cur_len
>= iov
->iov_len
) {
77 cur_len
-= iov
->iov_len
;
83 iov
->iov_len
-= cur_len
;
86 /* Should never reach here */
90 int __hidden
ubus_send_msg(struct ubus_context
*ctx
, uint32_t seq
,
91 struct blob_attr
*msg
, int cmd
, uint32_t peer
)
93 struct ubus_msghdr hdr
;
94 struct iovec iov
[2] = {
105 blob_buf_init(&b
, 0);
109 iov
[1].iov_base
= (char *) msg
;
110 iov
[1].iov_len
= blob_raw_len(msg
);
112 ret
= writev_retry(ctx
->sock
.fd
, iov
, ARRAY_SIZE(iov
));
114 ctx
->sock
.eof
= true;
119 static int recv_retry(int fd
, struct iovec
*iov
, bool wait
)
121 int bytes
, total
= 0;
123 while (iov
->iov_len
> 0) {
125 wait_data(fd
, false);
127 bytes
= read(fd
, iov
->iov_base
, iov
->iov_len
);
145 iov
->iov_len
-= bytes
;
146 iov
->iov_base
+= bytes
;
153 static bool ubus_validate_hdr(struct ubus_msghdr
*hdr
)
155 if (hdr
->version
!= 0)
158 if (blob_raw_len(hdr
->data
) < sizeof(*hdr
->data
))
161 if (blob_pad_len(hdr
->data
) > UBUS_MAX_MSGLEN
)
167 static bool get_next_msg(struct ubus_context
*ctx
)
169 struct iovec iov
= STATIC_IOV(ctx
->msgbuf
.hdr
);
172 /* receive header + start attribute */
173 iov
.iov_len
+= sizeof(struct blob_attr
);
174 r
= recv_retry(ctx
->sock
.fd
, &iov
, false);
177 ctx
->sock
.eof
= true;
182 iov
.iov_len
= blob_len(ctx
->msgbuf
.hdr
.data
);
183 if (iov
.iov_len
> 0 && !recv_retry(ctx
->sock
.fd
, &iov
, true))
186 return ubus_validate_hdr(&ctx
->msgbuf
.hdr
);
189 void __hidden
ubus_handle_data(struct uloop_fd
*u
, unsigned int events
)
191 struct ubus_context
*ctx
= container_of(u
, struct ubus_context
, sock
);
192 struct ubus_msghdr
*hdr
= &ctx
->msgbuf
.hdr
;
194 while (get_next_msg(ctx
)) {
195 ubus_process_msg(ctx
, hdr
);
201 ctx
->connection_lost(ctx
);
205 ubus_refresh_state(struct ubus_context
*ctx
)
207 struct ubus_object
*obj
, *tmp
;
208 struct ubus_object
**objs
;
211 /* clear all type IDs, they need to be registered again */
212 avl_for_each_element(&ctx
->objects
, obj
, avl
)
216 /* push out all objects again */
217 objs
= alloca(ctx
->objects
.count
* sizeof(*objs
));
218 avl_remove_all_elements(&ctx
->objects
, obj
, avl
, tmp
) {
223 for (n
= i
, i
= 0; i
< n
; i
++)
224 ubus_add_object(ctx
, objs
[i
]);
227 int ubus_reconnect(struct ubus_context
*ctx
, const char *path
)
230 struct ubus_msghdr hdr
;
231 struct blob_attr data
;
233 struct blob_attr
*buf
;
234 int ret
= UBUS_STATUS_UNKNOWN_ERROR
;
237 path
= UBUS_UNIX_SOCKET
;
239 if (ctx
->sock
.fd
>= 0) {
240 if (ctx
->sock
.registered
)
241 uloop_fd_delete(&ctx
->sock
);
246 ctx
->sock
.fd
= usock(USOCK_UNIX
, path
, NULL
);
247 if (ctx
->sock
.fd
< 0)
248 return UBUS_STATUS_CONNECTION_FAILED
;
250 if (read(ctx
->sock
.fd
, &hdr
, sizeof(hdr
)) != sizeof(hdr
))
253 if (!ubus_validate_hdr(&hdr
.hdr
))
256 if (hdr
.hdr
.type
!= UBUS_MSG_HELLO
)
259 buf
= calloc(1, blob_raw_len(&hdr
.data
));
263 memcpy(buf
, &hdr
.data
, sizeof(hdr
.data
));
264 if (read(ctx
->sock
.fd
, blob_data(buf
), blob_len(buf
)) != blob_len(buf
))
267 ctx
->local_id
= hdr
.hdr
.peer
;
271 ret
= UBUS_STATUS_OK
;
272 fcntl(ctx
->sock
.fd
, F_SETFL
, fcntl(ctx
->sock
.fd
, F_GETFL
) | O_NONBLOCK
);
274 ubus_refresh_state(ctx
);