1 #include <sys/socket.h>
8 #include <libubox/blob.h>
9 #include <libubox/uloop.h>
10 #include <libubox/usock.h>
11 #include <libubox/list.h>
15 static struct avl_tree clients;
17 static struct ubus_msg_buf *ubus_msg_unshare(struct ubus_msg_buf *ub)
19 ub = realloc(ub, sizeof(*ub) + ub->len);
24 memcpy(ub + 1, ub->data, ub->len);
25 ub->data = (void *) (ub + 1);
29 struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub)
31 if (ub->refcount == ~0)
32 return ubus_msg_unshare(ub);
38 struct ubus_msg_buf *ubus_msg_new(void *data, int len, bool shared)
40 struct ubus_msg_buf *ub;
41 int buflen = sizeof(*ub);
46 ub = calloc(1, buflen);
55 ub->data = (void *) (ub + 1);
57 memcpy(ub + 1, data, len);
64 void ubus_msg_free(struct ubus_msg_buf *ub)
66 switch (ub->refcount) {
77 static int ubus_msg_writev(int fd, struct ubus_msg_buf *ub, int offset)
81 if (offset < sizeof(ub->hdr)) {
82 iov[0].iov_base = ((char *) &ub->hdr) + offset;
83 iov[0].iov_len = sizeof(ub->hdr) - offset;
84 iov[1].iov_base = (char *) ub->data;
85 iov[1].iov_len = ub->len;
86 return writev(fd, iov, 2);
88 offset -= sizeof(ub->hdr);
89 return write(fd, ((char *) ub->data) + offset, ub->len - offset);
93 static void ubus_msg_enqueue(struct ubus_client *cl, struct ubus_msg_buf *ub)
95 if (cl->tx_queue[cl->txq_tail])
98 cl->tx_queue[cl->txq_tail] = ubus_msg_ref(ub);
99 cl->txq_tail = (cl->txq_tail + 1) % ARRAY_SIZE(cl->tx_queue);
102 /* takes the msgbuf reference */
103 void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free)
107 if (!cl->tx_queue[cl->txq_cur]) {
108 written = ubus_msg_writev(cl->sock.fd, ub, 0);
109 if (written >= ub->len + sizeof(ub->hdr))
115 cl->txq_ofs = written;
117 /* get an event once we can write to the socket again */
118 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
120 ubus_msg_enqueue(cl, ub);
127 static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
129 return cl->tx_queue[cl->txq_cur];
132 static void ubus_msg_dequeue(struct ubus_client *cl)
134 struct ubus_msg_buf *ub = ubus_msg_head(cl);
141 cl->tx_queue[cl->txq_cur] = NULL;
142 cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
145 static void handle_client_disconnect(struct ubus_client *cl)
147 struct ubus_object *obj;
149 while (!list_empty(&cl->objects)) {
150 obj = list_first_entry(&cl->objects, struct ubus_object, list);
151 ubusd_free_object(obj);
154 while (ubus_msg_head(cl))
155 ubus_msg_dequeue(cl);
157 ubus_free_id(&clients, &cl->id);
158 uloop_fd_delete(&cl->sock);
163 static void client_cb(struct uloop_fd *sock, unsigned int events)
165 struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
166 struct ubus_msg_buf *ub;
168 /* first try to tx more pending data */
169 while ((ub = ubus_msg_head(cl))) {
172 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
184 cl->txq_ofs += written;
185 if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
188 ubus_msg_dequeue(cl);
191 /* prevent further ULOOP_WRITE events if we don't have data
193 if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
194 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
197 if (!sock->eof && cl->pending_msg_offset < sizeof(cl->hdrbuf)) {
198 int offset = cl->pending_msg_offset;
201 bytes = read(sock->fd, (char *)&cl->hdrbuf + offset, sizeof(cl->hdrbuf) - offset);
205 cl->pending_msg_offset += bytes;
206 if (cl->pending_msg_offset < sizeof(cl->hdrbuf))
209 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
212 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
213 if (!cl->pending_msg)
216 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
217 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
220 ub = cl->pending_msg;
222 int offset = cl->pending_msg_offset - sizeof(ub->hdr);
223 int len = blob_raw_len(ub->data) - offset;
227 bytes = read(sock->fd, (char *) ub->data + offset, len);
233 cl->pending_msg_offset += bytes;
238 cl->pending_msg_offset = 0;
239 cl->pending_msg = NULL;
240 ubusd_receive_message(cl, ub);
245 if (!sock->eof || ubus_msg_head(cl))
249 handle_client_disconnect(cl);
252 struct ubus_client *ubusd_get_client_by_id(uint32_t id)
254 struct ubus_id *clid;
256 clid = ubus_find_id(&clients, id);
260 return container_of(clid, struct ubus_client, id);
263 static bool get_next_connection(int fd)
265 struct ubus_client *cl;
268 client_fd = accept(fd, NULL, 0);
279 cl = calloc(1, sizeof(*cl));
280 cl->sock.fd = client_fd;
282 INIT_LIST_HEAD(&cl->objects);
283 if (!ubus_alloc_id(&clients, &cl->id, 0))
286 cl->sock.cb = client_cb;
287 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
288 if (!ubusd_send_hello(cl))
294 ubus_free_id(&clients, &cl->id);
301 static void server_cb(struct uloop_fd *fd, unsigned int events)
306 next = get_next_connection(fd->fd);
310 static struct uloop_fd server_fd = {
314 static int usage(const char *progname)
316 fprintf(stderr, "Usage: %s [<options>]\n"
318 " -s <socket>: Set the unix domain socket to listen on\n"
323 int main(int argc, char **argv)
325 const char *ubus_socket = UBUS_UNIX_SOCKET;
329 signal(SIGPIPE, SIG_IGN);
331 ubus_init_id_tree(&clients);
335 while ((ch = getopt(argc, argv, "s:")) != -1) {
338 ubus_socket = optarg;
341 return usage(argv[0]);
346 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
347 if (server_fd.fd < 0) {
352 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);