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 if (ub
->refcount
== ~0)
36 return ubus_msg_new(ub
->data
, ub
->len
, false);
42 struct ubus_msg_buf
*ubus_msg_new(void *data
, int len
, bool shared
)
44 struct ubus_msg_buf
*ub
;
45 int buflen
= sizeof(*ub
);
50 ub
= calloc(1, buflen
);
61 ub
->data
= (void *) (ub
+ 1);
63 memcpy(ub
+ 1, data
, len
);
70 void ubus_msg_free(struct ubus_msg_buf
*ub
)
72 switch (ub
->refcount
) {
86 static int ubus_msg_writev(int fd
, struct ubus_msg_buf
*ub
, int offset
)
88 static struct iovec iov
[2];
94 .cmsg_len
= sizeof(fd_buf
),
95 .cmsg_level
= SOL_SOCKET
,
96 .cmsg_type
= SCM_RIGHTS
,
99 struct msghdr msghdr
= {
101 .msg_iovlen
= ARRAY_SIZE(iov
),
102 .msg_control
= &fd_buf
,
103 .msg_controllen
= sizeof(fd_buf
),
108 msghdr
.msg_control
= NULL
;
109 msghdr
.msg_controllen
= 0;
112 if (offset
< sizeof(ub
->hdr
)) {
113 iov
[0].iov_base
= ((char *) &ub
->hdr
) + offset
;
114 iov
[0].iov_len
= sizeof(ub
->hdr
) - offset
;
115 iov
[1].iov_base
= (char *) ub
->data
;
116 iov
[1].iov_len
= ub
->len
;
118 return sendmsg(fd
, &msghdr
, 0);
120 offset
-= sizeof(ub
->hdr
);
121 return write(fd
, ((char *) ub
->data
) + offset
, ub
->len
- offset
);
125 static void ubus_msg_enqueue(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
)
127 if (cl
->tx_queue
[cl
->txq_tail
])
130 cl
->tx_queue
[cl
->txq_tail
] = ubus_msg_ref(ub
);
131 cl
->txq_tail
= (cl
->txq_tail
+ 1) % ARRAY_SIZE(cl
->tx_queue
);
134 /* takes the msgbuf reference */
135 void ubus_msg_send(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
, bool free
)
139 if (!cl
->tx_queue
[cl
->txq_cur
]) {
140 written
= ubus_msg_writev(cl
->sock
.fd
, ub
, 0);
141 if (written
>= ub
->len
+ sizeof(ub
->hdr
))
147 cl
->txq_ofs
= written
;
149 /* get an event once we can write to the socket again */
150 uloop_fd_add(&cl
->sock
, ULOOP_READ
| ULOOP_WRITE
| ULOOP_EDGE_TRIGGER
);
152 ubus_msg_enqueue(cl
, ub
);
159 static struct ubus_msg_buf
*ubus_msg_head(struct ubus_client
*cl
)
161 return cl
->tx_queue
[cl
->txq_cur
];
164 static void ubus_msg_dequeue(struct ubus_client
*cl
)
166 struct ubus_msg_buf
*ub
= ubus_msg_head(cl
);
173 cl
->tx_queue
[cl
->txq_cur
] = NULL
;
174 cl
->txq_cur
= (cl
->txq_cur
+ 1) % ARRAY_SIZE(cl
->tx_queue
);
177 static void handle_client_disconnect(struct ubus_client
*cl
)
179 while (ubus_msg_head(cl
))
180 ubus_msg_dequeue(cl
);
182 ubusd_proto_free_client(cl
);
183 if (cl
->pending_msg_fd
>= 0)
184 close(cl
->pending_msg_fd
);
185 uloop_fd_delete(&cl
->sock
);
190 static void client_cb(struct uloop_fd
*sock
, unsigned int events
)
192 struct ubus_client
*cl
= container_of(sock
, struct ubus_client
, sock
);
193 struct ubus_msg_buf
*ub
;
194 static struct iovec iov
;
200 .cmsg_type
= SCM_RIGHTS
,
201 .cmsg_level
= SOL_SOCKET
,
202 .cmsg_len
= sizeof(fd_buf
),
205 struct msghdr msghdr
= {
210 /* first try to tx more pending data */
211 while ((ub
= ubus_msg_head(cl
))) {
214 written
= ubus_msg_writev(sock
->fd
, ub
, cl
->txq_ofs
);
226 cl
->txq_ofs
+= written
;
227 if (cl
->txq_ofs
< ub
->len
+ sizeof(ub
->hdr
))
230 ubus_msg_dequeue(cl
);
233 /* prevent further ULOOP_WRITE events if we don't have data
235 if (!ubus_msg_head(cl
) && (events
& ULOOP_WRITE
))
236 uloop_fd_add(sock
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
239 if (!sock
->eof
&& cl
->pending_msg_offset
< sizeof(cl
->hdrbuf
)) {
240 int offset
= cl
->pending_msg_offset
;
245 iov
.iov_base
= &cl
->hdrbuf
+ offset
;
246 iov
.iov_len
= sizeof(cl
->hdrbuf
) - offset
;
248 if (cl
->pending_msg_fd
< 0) {
249 msghdr
.msg_control
= &fd_buf
;
250 msghdr
.msg_controllen
= sizeof(fd_buf
);
252 msghdr
.msg_control
= NULL
;
253 msghdr
.msg_controllen
= 0;
256 bytes
= recvmsg(sock
->fd
, &msghdr
, 0);
261 cl
->pending_msg_fd
= fd_buf
.fd
;
263 cl
->pending_msg_offset
+= bytes
;
264 if (cl
->pending_msg_offset
< sizeof(cl
->hdrbuf
))
267 if (blob_pad_len(&cl
->hdrbuf
.data
) > UBUS_MAX_MSGLEN
)
270 cl
->pending_msg
= ubus_msg_new(NULL
, blob_raw_len(&cl
->hdrbuf
.data
), false);
271 if (!cl
->pending_msg
)
274 memcpy(&cl
->pending_msg
->hdr
, &cl
->hdrbuf
.hdr
, sizeof(cl
->hdrbuf
.hdr
));
275 memcpy(cl
->pending_msg
->data
, &cl
->hdrbuf
.data
, sizeof(cl
->hdrbuf
.data
));
278 ub
= cl
->pending_msg
;
280 int offset
= cl
->pending_msg_offset
- sizeof(ub
->hdr
);
281 int len
= blob_raw_len(ub
->data
) - offset
;
285 bytes
= read(sock
->fd
, (char *) ub
->data
+ offset
, len
);
291 cl
->pending_msg_offset
+= bytes
;
296 ub
->fd
= cl
->pending_msg_fd
;
297 cl
->pending_msg_fd
= -1;
298 cl
->pending_msg_offset
= 0;
299 cl
->pending_msg
= NULL
;
300 ubusd_proto_receive_message(cl
, ub
);
305 if (!sock
->eof
|| ubus_msg_head(cl
))
309 handle_client_disconnect(cl
);
312 static bool get_next_connection(int fd
)
314 struct ubus_client
*cl
;
317 client_fd
= accept(fd
, NULL
, 0);
328 cl
= ubusd_proto_new_client(client_fd
, client_cb
);
330 uloop_fd_add(&cl
->sock
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
337 static void server_cb(struct uloop_fd
*fd
, unsigned int events
)
342 next
= get_next_connection(fd
->fd
);
346 static struct uloop_fd server_fd
= {
350 static int usage(const char *progname
)
352 fprintf(stderr
, "Usage: %s [<options>]\n"
354 " -s <socket>: Set the unix domain socket to listen on\n"
359 static void sighup_handler(int sig
)
364 int main(int argc
, char **argv
)
366 const char *ubus_socket
= UBUS_UNIX_SOCKET
;
370 signal(SIGPIPE
, SIG_IGN
);
371 signal(SIGHUP
, sighup_handler
);
373 openlog("ubusd", LOG_PID
, LOG_DAEMON
);
376 while ((ch
= getopt(argc
, argv
, "s:")) != -1) {
379 ubus_socket
= optarg
;
382 return usage(argv
[0]);
388 server_fd
.fd
= usock(USOCK_UNIX
| USOCK_SERVER
| USOCK_NONBLOCK
, ubus_socket
, NULL
);
389 if (server_fd
.fd
< 0) {
394 uloop_fd_add(&server_fd
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);