5b1d52c808924c1e40eb3d699225db981ad9e1e3
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 <systemd/sd-daemon.h>
29 #include <libubox/blob.h>
30 #include <libubox/uloop.h>
31 #include <libubox/usock.h>
32 #include <libubox/list.h>
36 static struct ubus_msg_buf
*ubus_msg_ref(struct ubus_msg_buf
*ub
)
38 if (ub
->refcount
== ~0)
39 return ubus_msg_new(ub
->data
, ub
->len
, false);
45 struct ubus_msg_buf
*ubus_msg_new(void *data
, int len
, bool shared
)
47 struct ubus_msg_buf
*ub
;
48 int buflen
= sizeof(*ub
);
53 ub
= calloc(1, buflen
);
64 ub
->data
= (void *) (ub
+ 1);
66 memcpy(ub
+ 1, data
, len
);
73 void ubus_msg_free(struct ubus_msg_buf
*ub
)
75 switch (ub
->refcount
) {
89 static int ubus_msg_writev(int fd
, struct ubus_msg_buf
*ub
, int offset
)
91 static struct iovec iov
[2];
97 .cmsg_len
= sizeof(fd_buf
),
98 .cmsg_level
= SOL_SOCKET
,
99 .cmsg_type
= SCM_RIGHTS
,
102 struct msghdr msghdr
= {
104 .msg_iovlen
= ARRAY_SIZE(iov
),
105 .msg_control
= &fd_buf
,
106 .msg_controllen
= sizeof(fd_buf
),
111 msghdr
.msg_control
= NULL
;
112 msghdr
.msg_controllen
= 0;
115 if (offset
< sizeof(ub
->hdr
)) {
116 struct ubus_msghdr hdr
;
118 hdr
.version
= ub
->hdr
.version
;
119 hdr
.type
= ub
->hdr
.type
;
120 hdr
.seq
= cpu_to_be16(ub
->hdr
.seq
);
121 hdr
.peer
= cpu_to_be32(ub
->hdr
.peer
);
123 iov
[0].iov_base
= ((char *) &hdr
) + offset
;
124 iov
[0].iov_len
= sizeof(hdr
) - offset
;
125 iov
[1].iov_base
= (char *) ub
->data
;
126 iov
[1].iov_len
= ub
->len
;
128 return sendmsg(fd
, &msghdr
, 0);
130 offset
-= sizeof(ub
->hdr
);
131 return write(fd
, ((char *) ub
->data
) + offset
, ub
->len
- offset
);
135 static void ubus_msg_enqueue(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
)
137 if (cl
->tx_queue
[cl
->txq_tail
])
140 cl
->tx_queue
[cl
->txq_tail
] = ubus_msg_ref(ub
);
141 cl
->txq_tail
= (cl
->txq_tail
+ 1) % ARRAY_SIZE(cl
->tx_queue
);
144 /* takes the msgbuf reference */
145 void ubus_msg_send(struct ubus_client
*cl
, struct ubus_msg_buf
*ub
, bool free
)
149 if (ub
->hdr
.type
!= UBUS_MSG_MONITOR
)
150 ubusd_monitor_message(cl
, ub
, true);
152 if (!cl
->tx_queue
[cl
->txq_cur
]) {
153 written
= ubus_msg_writev(cl
->sock
.fd
, ub
, 0);
154 if (written
>= ub
->len
+ sizeof(ub
->hdr
))
160 cl
->txq_ofs
= written
;
162 /* get an event once we can write to the socket again */
163 uloop_fd_add(&cl
->sock
, ULOOP_READ
| ULOOP_WRITE
| ULOOP_EDGE_TRIGGER
);
165 ubus_msg_enqueue(cl
, ub
);
172 static struct ubus_msg_buf
*ubus_msg_head(struct ubus_client
*cl
)
174 return cl
->tx_queue
[cl
->txq_cur
];
177 static void ubus_msg_dequeue(struct ubus_client
*cl
)
179 struct ubus_msg_buf
*ub
= ubus_msg_head(cl
);
186 cl
->tx_queue
[cl
->txq_cur
] = NULL
;
187 cl
->txq_cur
= (cl
->txq_cur
+ 1) % ARRAY_SIZE(cl
->tx_queue
);
190 static void handle_client_disconnect(struct ubus_client
*cl
)
192 while (ubus_msg_head(cl
))
193 ubus_msg_dequeue(cl
);
195 ubusd_monitor_disconnect(cl
);
196 ubusd_proto_free_client(cl
);
197 if (cl
->pending_msg_fd
>= 0)
198 close(cl
->pending_msg_fd
);
199 uloop_fd_delete(&cl
->sock
);
204 static void client_cb(struct uloop_fd
*sock
, unsigned int events
)
206 struct ubus_client
*cl
= container_of(sock
, struct ubus_client
, sock
);
207 struct ubus_msg_buf
*ub
;
208 static struct iovec iov
;
214 .cmsg_type
= SCM_RIGHTS
,
215 .cmsg_level
= SOL_SOCKET
,
216 .cmsg_len
= sizeof(fd_buf
),
219 struct msghdr msghdr
= {
224 /* first try to tx more pending data */
225 while ((ub
= ubus_msg_head(cl
))) {
228 written
= ubus_msg_writev(sock
->fd
, ub
, cl
->txq_ofs
);
240 cl
->txq_ofs
+= written
;
241 if (cl
->txq_ofs
< ub
->len
+ sizeof(ub
->hdr
))
244 ubus_msg_dequeue(cl
);
247 /* prevent further ULOOP_WRITE events if we don't have data
249 if (!ubus_msg_head(cl
) && (events
& ULOOP_WRITE
))
250 uloop_fd_add(sock
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
253 if (!sock
->eof
&& cl
->pending_msg_offset
< sizeof(cl
->hdrbuf
)) {
254 int offset
= cl
->pending_msg_offset
;
259 iov
.iov_base
= ((char *) &cl
->hdrbuf
) + offset
;
260 iov
.iov_len
= sizeof(cl
->hdrbuf
) - offset
;
262 if (cl
->pending_msg_fd
< 0) {
263 msghdr
.msg_control
= &fd_buf
;
264 msghdr
.msg_controllen
= sizeof(fd_buf
);
266 msghdr
.msg_control
= NULL
;
267 msghdr
.msg_controllen
= 0;
270 bytes
= recvmsg(sock
->fd
, &msghdr
, 0);
275 cl
->pending_msg_fd
= fd_buf
.fd
;
277 cl
->pending_msg_offset
+= bytes
;
278 if (cl
->pending_msg_offset
< sizeof(cl
->hdrbuf
))
281 if (blob_pad_len(&cl
->hdrbuf
.data
) > UBUS_MAX_MSGLEN
)
284 cl
->pending_msg
= ubus_msg_new(NULL
, blob_raw_len(&cl
->hdrbuf
.data
), false);
285 if (!cl
->pending_msg
)
288 cl
->hdrbuf
.hdr
.seq
= be16_to_cpu(cl
->hdrbuf
.hdr
.seq
);
289 cl
->hdrbuf
.hdr
.peer
= be32_to_cpu(cl
->hdrbuf
.hdr
.peer
);
291 memcpy(&cl
->pending_msg
->hdr
, &cl
->hdrbuf
.hdr
, sizeof(cl
->hdrbuf
.hdr
));
292 memcpy(cl
->pending_msg
->data
, &cl
->hdrbuf
.data
, sizeof(cl
->hdrbuf
.data
));
295 ub
= cl
->pending_msg
;
297 int offset
= cl
->pending_msg_offset
- sizeof(ub
->hdr
);
298 int len
= blob_raw_len(ub
->data
) - offset
;
302 bytes
= read(sock
->fd
, (char *) ub
->data
+ offset
, len
);
308 cl
->pending_msg_offset
+= bytes
;
313 ub
->fd
= cl
->pending_msg_fd
;
314 cl
->pending_msg_fd
= -1;
315 cl
->pending_msg_offset
= 0;
316 cl
->pending_msg
= NULL
;
317 ubusd_monitor_message(cl
, ub
, false);
318 ubusd_proto_receive_message(cl
, ub
);
323 if (!sock
->eof
|| ubus_msg_head(cl
))
327 handle_client_disconnect(cl
);
330 static bool get_next_connection(int fd
)
332 struct ubus_client
*cl
;
335 client_fd
= accept(fd
, NULL
, 0);
346 cl
= ubusd_proto_new_client(client_fd
, client_cb
);
348 uloop_fd_add(&cl
->sock
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);
355 static void server_cb(struct uloop_fd
*fd
, unsigned int events
)
360 next
= get_next_connection(fd
->fd
);
364 static struct uloop_fd server_fd
= {
368 static int usage(const char *progname
)
370 fprintf(stderr
, "Usage: %s [<options>]\n"
372 " -A <path>: Set the path to ACL files\n"
373 " -s <socket>: Set the unix domain socket to listen on\n"
378 static void sighup_handler(int sig
)
383 int main(int argc
, char **argv
)
385 const char *ubus_socket
= UBUS_UNIX_SOCKET
;
386 bool remove_socket
= true;
389 #ifdef ENABLE_SYSTEMD
393 signal(SIGPIPE
, SIG_IGN
);
394 signal(SIGHUP
, sighup_handler
);
396 openlog("ubusd", LOG_PID
, LOG_DAEMON
);
399 while ((ch
= getopt(argc
, argv
, "A:s:")) != -1) {
402 ubus_socket
= optarg
;
405 ubusd_acl_dir
= optarg
;
408 return usage(argv
[0]);
412 #ifdef ENABLE_SYSTEMD
413 n_fds
= sd_listen_fds(1);
415 fprintf(stderr
, "Too many file descriptors received.\n");
418 } else if (n_fds
== 1) {
419 server_fd
.fd
= SD_LISTEN_FDS_START
+ 0;
420 fcntl(server_fd
.fd
, F_SETFD
, fcntl(server_fd
.fd
, F_GETFD
) | FD_CLOEXEC
);
421 fcntl(server_fd
.fd
, F_SETFL
, fcntl(server_fd
.fd
, F_GETFL
) | O_NONBLOCK
);
423 remove_socket
= false;
429 server_fd
.fd
= usock(USOCK_UNIX
| USOCK_SERVER
| USOCK_NONBLOCK
, ubus_socket
, NULL
);
430 if (server_fd
.fd
< 0) {
436 uloop_fd_add(&server_fd
, ULOOP_READ
| ULOOP_EDGE_TRIGGER
);