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 ubus_msg_buf *ubus_msg_unshare(struct ubus_msg_buf *ub)
17 ub = realloc(ub, sizeof(*ub) + ub->len);
22 memcpy(ub + 1, ub->data, ub->len);
23 ub->data = (void *) (ub + 1);
27 static struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub)
29 if (ub->refcount == ~0)
30 return ubus_msg_unshare(ub);
36 struct ubus_msg_buf *ubus_msg_new(void *data, int len, bool shared)
38 struct ubus_msg_buf *ub;
39 int buflen = sizeof(*ub);
44 ub = calloc(1, buflen);
53 ub->data = (void *) (ub + 1);
55 memcpy(ub + 1, data, len);
62 void ubus_msg_free(struct ubus_msg_buf *ub)
64 switch (ub->refcount) {
75 static int ubus_msg_writev(int fd, struct ubus_msg_buf *ub, int offset)
79 if (offset < sizeof(ub->hdr)) {
80 iov[0].iov_base = ((char *) &ub->hdr) + offset;
81 iov[0].iov_len = sizeof(ub->hdr) - offset;
82 iov[1].iov_base = (char *) ub->data;
83 iov[1].iov_len = ub->len;
84 return writev(fd, iov, 2);
86 offset -= sizeof(ub->hdr);
87 return write(fd, ((char *) ub->data) + offset, ub->len - offset);
91 static void ubus_msg_enqueue(struct ubus_client *cl, struct ubus_msg_buf *ub)
93 if (cl->tx_queue[cl->txq_tail])
96 cl->tx_queue[cl->txq_tail] = ubus_msg_ref(ub);
97 cl->txq_tail = (cl->txq_tail + 1) % ARRAY_SIZE(cl->tx_queue);
100 /* takes the msgbuf reference */
101 void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free)
105 if (!cl->tx_queue[cl->txq_cur]) {
106 written = ubus_msg_writev(cl->sock.fd, ub, 0);
107 if (written >= ub->len + sizeof(ub->hdr))
113 cl->txq_ofs = written;
115 /* get an event once we can write to the socket again */
116 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
118 ubus_msg_enqueue(cl, ub);
125 static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
127 return cl->tx_queue[cl->txq_cur];
130 static void ubus_msg_dequeue(struct ubus_client *cl)
132 struct ubus_msg_buf *ub = ubus_msg_head(cl);
139 cl->tx_queue[cl->txq_cur] = NULL;
140 cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
143 static void handle_client_disconnect(struct ubus_client *cl)
145 while (ubus_msg_head(cl))
146 ubus_msg_dequeue(cl);
148 ubusd_proto_free_client(cl);
149 uloop_fd_delete(&cl->sock);
154 static void client_cb(struct uloop_fd *sock, unsigned int events)
156 struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
157 struct ubus_msg_buf *ub;
159 /* first try to tx more pending data */
160 while ((ub = ubus_msg_head(cl))) {
163 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
175 cl->txq_ofs += written;
176 if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
179 ubus_msg_dequeue(cl);
182 /* prevent further ULOOP_WRITE events if we don't have data
184 if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
185 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
188 if (!sock->eof && cl->pending_msg_offset < sizeof(cl->hdrbuf)) {
189 int offset = cl->pending_msg_offset;
192 bytes = read(sock->fd, (char *)&cl->hdrbuf + offset, sizeof(cl->hdrbuf) - offset);
196 cl->pending_msg_offset += bytes;
197 if (cl->pending_msg_offset < sizeof(cl->hdrbuf))
200 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
203 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
204 if (!cl->pending_msg)
207 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
208 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
211 ub = cl->pending_msg;
213 int offset = cl->pending_msg_offset - sizeof(ub->hdr);
214 int len = blob_raw_len(ub->data) - offset;
218 bytes = read(sock->fd, (char *) ub->data + offset, len);
224 cl->pending_msg_offset += bytes;
229 cl->pending_msg_offset = 0;
230 cl->pending_msg = NULL;
231 ubusd_proto_receive_message(cl, ub);
236 if (!sock->eof || ubus_msg_head(cl))
240 handle_client_disconnect(cl);
243 static bool get_next_connection(int fd)
245 struct ubus_client *cl;
248 client_fd = accept(fd, NULL, 0);
259 cl = ubusd_proto_new_client(client_fd, client_cb);
261 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
268 static void server_cb(struct uloop_fd *fd, unsigned int events)
273 next = get_next_connection(fd->fd);
277 static struct uloop_fd server_fd = {
281 static int usage(const char *progname)
283 fprintf(stderr, "Usage: %s [<options>]\n"
285 " -s <socket>: Set the unix domain socket to listen on\n"
290 int main(int argc, char **argv)
292 const char *ubus_socket = UBUS_UNIX_SOCKET;
296 signal(SIGPIPE, SIG_IGN);
300 while ((ch = getopt(argc, argv, "s:")) != -1) {
303 ubus_socket = optarg;
306 return usage(argv[0]);
311 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
312 if (server_fd.fd < 0) {
317 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);