0f35d3e25d344ea36a3a867ef19370790e715d71
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/socket.h>
18 #include <sys/param.h>
26 #include <libubox/blob.h>
27 #include <libubox/uloop.h>
28 #include <libubox/usock.h>
29 #include <libubox/list.h>
33 static struct ubus_msg_buf
*ubus_msg_ref(struct ubus_msg_buf
*ub
)
35 struct ubus_msg_buf
*new_ub
;
36 if (ub
->refcount
== ~0) {
37 new_ub
= ubus_msg_new(ub
->data
, ub
->len
, false);
40 memcpy(&new_ub
->hdr
, &ub
->hdr
, sizeof(struct ubus_msghdr
));
49 struct ubus_msg_buf
*ubus_msg_new(void *data
, int len
, bool shared
)
51 struct ubus_msg_buf
*ub
;
52 int buflen
= sizeof(*ub
);
57 ub
= calloc(1, buflen
);
68 ub
->data
= (void *) (ub
+ 1);
70 memcpy(ub
+ 1, data
, len
);
77 void ubus_msg_free(struct ubus_msg_buf
*ub
)
79 switch (ub
->refcount
) {
93 static int ubus_msg_writev(int fd
, struct ubus_msg_buf
*ub
, int offset
)
95 static struct iovec iov
[2];
101 .cmsg_len
= sizeof(fd_buf
),
102 .cmsg_level
= SOL_SOCKET
,
103 .cmsg_type
= SCM_RIGHTS
,
106 struct msghdr msghdr
= {
108 .msg_iovlen
= ARRAY_SIZE(iov
),
109 .msg_control
= &fd_buf
,
110 .msg_controllen
= sizeof(fd_buf
),
112 struct ubus_msghdr hdr
;
116 if (ub
->fd
< 0 || offset
) {
117 msghdr
.msg_control
= NULL
;
118 msghdr
.msg_controllen
= 0;
121 if (offset
< sizeof(ub
->hdr
)) {
122 hdr
.version
= ub
->hdr
.version
;
123 hdr
.type
= ub
->hdr
.type
;
124 hdr
.seq
= cpu_to_be16(ub
->hdr
.seq
);
125 hdr
.peer
= cpu_to_be32(ub
->hdr
.peer
);
127 iov
[0].iov_base
= ((char *) &hdr
) + offset
;
128 iov
[0].iov_len
= sizeof(hdr
) - offset
;
129 iov
[1].iov_base
= (char *) ub
->data
;
130 iov
[1].iov_len
= ub
->len
;
132 offset
-= sizeof(ub
->hdr
);
133 iov
[0].iov_base
= ((char *) ub
->data
) + offset
;
134 iov
[0].iov_len
= ub
->len
- offset
;
135 msghdr
.msg_iovlen
= 1;
139 ret
= sendmsg(fd
, &msghdr
, 0);
140 } while (ret
< 0 && errno
== EINTR
);
145 static void ubus_msg_enqueue(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
)
147 if (cl
->tx_queue
[cl
->txq_tail
])
150 cl
->tx_queue
[cl
->txq_tail
] = ubus_msg_ref(ub
);
151 cl
->txq_tail
= (cl
->txq_tail
+ 1) % ARRAY_SIZE(cl
->tx_queue
);
154 /* takes the msgbuf reference */
155 void ubus_msg_send(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
)
159 if (ub
->hdr
.type
!= UBUS_MSG_MONITOR
)
160 ubusd_monitor_message(cl
, ub
, true);
162 if (!cl
->tx_queue
[cl
->txq_cur
]) {
163 written
= ubus_msg_writev(cl
->sock
.fd
, ub
, 0);
168 if (written
>= ub
->len
+ sizeof(ub
->hdr
))
171 cl
->txq_ofs
= written
;
173 /* get an event once we can write to the socket again */
174 uloop_fd_add(&cl
->sock
, ULOOP_READ
| ULOOP_WRITE
| ULOOP_EDGE_TRIGGER
);
176 ubus_msg_enqueue(cl
, ub
);
179 static struct ubus_msg_buf
*ubus_msg_head(struct ubus_client
*cl
)
181 return cl
->tx_queue
[cl
->txq_cur
];
184 static void ubus_msg_dequeue(struct ubus_client
*cl
)
186 struct ubus_msg_buf
*ub
= ubus_msg_head(cl
);
193 cl
->tx_queue
[cl
->txq_cur
] = NULL
;
194 cl
->txq_cur
= (cl
->txq_cur
+ 1) % ARRAY_SIZE(cl
->tx_queue
);
197 static void handle_client_disconnect(struct ubus_client
*cl
)
199 while (ubus_msg_head(cl
))
200 ubus_msg_dequeue(cl
);
202 ubusd_monitor_disconnect(cl
);
203 ubusd_proto_free_client(cl
);
204 if (cl
->pending_msg_fd
>= 0)
205 close(cl
->pending_msg_fd
);
206 uloop_fd_delete(&cl
->sock
);
211 static void client_cb(struct uloop_fd
*sock
, unsigned int events
)
213 struct ubus_client
*cl
= container_of(sock
, struct ubus_client
, sock
);
214 struct ubus_msg_buf
*ub
;
215 static struct iovec iov
;
221 .cmsg_type
= SCM_RIGHTS
,
222 .cmsg_level
= SOL_SOCKET
,
223 .cmsg_len
= sizeof(fd_buf
),
226 struct msghdr msghdr
= {
231 /* first try to tx more pending data */
232 while ((ub
= ubus_msg_head(cl
))) {
235 written
= ubus_msg_writev(sock
->fd
, ub
, cl
->txq_ofs
);
247 cl
->txq_ofs
+= written
;
248 if (cl
->txq_ofs
< ub
->len
+ sizeof(ub
->hdr
))
251 ubus_msg_dequeue(cl
);
254 /* prevent further ULOOP_WRITE events if we don't have data
256 if (!ubus_msg_head(cl
) && (events
& ULOOP_WRITE
))
257 uloop_fd_add(sock
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
260 if (!sock
->eof
&& cl
->pending_msg_offset
< sizeof(cl
->hdrbuf
)) {
261 int offset
= cl
->pending_msg_offset
;
266 iov
.iov_base
= ((char *) &cl
->hdrbuf
) + offset
;
267 iov
.iov_len
= sizeof(cl
->hdrbuf
) - offset
;
269 if (cl
->pending_msg_fd
< 0) {
270 msghdr
.msg_control
= &fd_buf
;
271 msghdr
.msg_controllen
= sizeof(fd_buf
);
273 msghdr
.msg_control
= NULL
;
274 msghdr
.msg_controllen
= 0;
277 bytes
= recvmsg(sock
->fd
, &msghdr
, 0);
282 cl
->pending_msg_fd
= fd_buf
.fd
;
284 cl
->pending_msg_offset
+= bytes
;
285 if (cl
->pending_msg_offset
< sizeof(cl
->hdrbuf
))
288 if (blob_pad_len(&cl
->hdrbuf
.data
) > UBUS_MAX_MSGLEN
)
291 cl
->pending_msg
= ubus_msg_new(NULL
, blob_raw_len(&cl
->hdrbuf
.data
), false);
292 if (!cl
->pending_msg
)
295 cl
->hdrbuf
.hdr
.seq
= be16_to_cpu(cl
->hdrbuf
.hdr
.seq
);
296 cl
->hdrbuf
.hdr
.peer
= be32_to_cpu(cl
->hdrbuf
.hdr
.peer
);
298 memcpy(&cl
->pending_msg
->hdr
, &cl
->hdrbuf
.hdr
, sizeof(cl
->hdrbuf
.hdr
));
299 memcpy(cl
->pending_msg
->data
, &cl
->hdrbuf
.data
, sizeof(cl
->hdrbuf
.data
));
302 ub
= cl
->pending_msg
;
304 int offset
= cl
->pending_msg_offset
- sizeof(ub
->hdr
);
305 int len
= blob_raw_len(ub
->data
) - offset
;
309 bytes
= read(sock
->fd
, (char *) ub
->data
+ offset
, len
);
315 cl
->pending_msg_offset
+= bytes
;
320 ub
->fd
= cl
->pending_msg_fd
;
321 cl
->pending_msg_fd
= -1;
322 cl
->pending_msg_offset
= 0;
323 cl
->pending_msg
= NULL
;
324 ubusd_monitor_message(cl
, ub
, false);
325 ubusd_proto_receive_message(cl
, ub
);
330 if (!sock
->eof
|| ubus_msg_head(cl
))
334 handle_client_disconnect(cl
);
337 static bool get_next_connection(int fd
)
339 struct ubus_client
*cl
;
342 client_fd
= accept(fd
, NULL
, 0);
353 cl
= ubusd_proto_new_client(client_fd
, client_cb
);
355 uloop_fd_add(&cl
->sock
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
362 static void server_cb(struct uloop_fd
*fd
, unsigned int events
)
367 next
= get_next_connection(fd
->fd
);
371 static struct uloop_fd server_fd
= {
375 static int usage(const char *progname
)
377 fprintf(stderr
, "Usage: %s [<options>]\n"
379 " -A <path>: Set the path to ACL files\n"
380 " -s <socket>: Set the unix domain socket to listen on\n"
385 static void sighup_handler(int sig
)
390 int main(int argc
, char **argv
)
392 const char *ubus_socket
= UBUS_UNIX_SOCKET
;
396 signal(SIGPIPE
, SIG_IGN
);
397 signal(SIGHUP
, sighup_handler
);
399 openlog("ubusd", LOG_PID
, LOG_DAEMON
);
402 while ((ch
= getopt(argc
, argv
, "A:s:")) != -1) {
405 ubus_socket
= optarg
;
408 ubusd_acl_dir
= optarg
;
411 return usage(argv
[0]);
417 server_fd
.fd
= usock(USOCK_UNIX
| USOCK_SERVER
| USOCK_NONBLOCK
, ubus_socket
, NULL
);
418 if (server_fd
.fd
< 0) {
423 uloop_fd_add(&server_fd
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);