2 * Copyright (C) 2011 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>
21 #include <libubox/blob.h>
22 #include <libubox/uloop.h>
23 #include <libubox/usock.h>
24 #include <libubox/list.h>
28 static struct ubus_msg_buf *ubus_msg_unshare(struct ubus_msg_buf *ub)
30 ub = realloc(ub, sizeof(*ub) + ub->len);
35 memcpy(ub + 1, ub->data, ub->len);
36 ub->data = (void *) (ub + 1);
40 static struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub)
42 if (ub->refcount == ~0)
43 return ubus_msg_unshare(ub);
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);
66 ub->data = (void *) (ub + 1);
68 memcpy(ub + 1, data, len);
75 void ubus_msg_free(struct ubus_msg_buf *ub)
77 switch (ub->refcount) {
88 static int ubus_msg_writev(int fd, struct ubus_msg_buf *ub, int offset)
92 if (offset < sizeof(ub->hdr)) {
93 iov[0].iov_base = ((char *) &ub->hdr) + offset;
94 iov[0].iov_len = sizeof(ub->hdr) - offset;
95 iov[1].iov_base = (char *) ub->data;
96 iov[1].iov_len = ub->len;
97 return writev(fd, iov, 2);
99 offset -= sizeof(ub->hdr);
100 return write(fd, ((char *) ub->data) + offset, ub->len - offset);
104 static void ubus_msg_enqueue(struct ubus_client *cl, struct ubus_msg_buf *ub)
106 if (cl->tx_queue[cl->txq_tail])
109 cl->tx_queue[cl->txq_tail] = ubus_msg_ref(ub);
110 cl->txq_tail = (cl->txq_tail + 1) % ARRAY_SIZE(cl->tx_queue);
113 /* takes the msgbuf reference */
114 void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free)
118 if (!cl->tx_queue[cl->txq_cur]) {
119 written = ubus_msg_writev(cl->sock.fd, ub, 0);
120 if (written >= ub->len + sizeof(ub->hdr))
126 cl->txq_ofs = written;
128 /* get an event once we can write to the socket again */
129 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
131 ubus_msg_enqueue(cl, ub);
138 static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
140 return cl->tx_queue[cl->txq_cur];
143 static void ubus_msg_dequeue(struct ubus_client *cl)
145 struct ubus_msg_buf *ub = ubus_msg_head(cl);
152 cl->tx_queue[cl->txq_cur] = NULL;
153 cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
156 static void handle_client_disconnect(struct ubus_client *cl)
158 while (ubus_msg_head(cl))
159 ubus_msg_dequeue(cl);
161 ubusd_proto_free_client(cl);
162 uloop_fd_delete(&cl->sock);
167 static void client_cb(struct uloop_fd *sock, unsigned int events)
169 struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
170 struct ubus_msg_buf *ub;
172 /* first try to tx more pending data */
173 while ((ub = ubus_msg_head(cl))) {
176 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
188 cl->txq_ofs += written;
189 if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
192 ubus_msg_dequeue(cl);
195 /* prevent further ULOOP_WRITE events if we don't have data
197 if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
198 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
201 if (!sock->eof && cl->pending_msg_offset < sizeof(cl->hdrbuf)) {
202 int offset = cl->pending_msg_offset;
205 bytes = read(sock->fd, (char *)&cl->hdrbuf + offset, sizeof(cl->hdrbuf) - offset);
209 cl->pending_msg_offset += bytes;
210 if (cl->pending_msg_offset < sizeof(cl->hdrbuf))
213 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
216 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
217 if (!cl->pending_msg)
220 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
221 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
224 ub = cl->pending_msg;
226 int offset = cl->pending_msg_offset - sizeof(ub->hdr);
227 int len = blob_raw_len(ub->data) - offset;
231 bytes = read(sock->fd, (char *) ub->data + offset, len);
237 cl->pending_msg_offset += bytes;
242 cl->pending_msg_offset = 0;
243 cl->pending_msg = NULL;
244 ubusd_proto_receive_message(cl, ub);
249 if (!sock->eof || ubus_msg_head(cl))
253 handle_client_disconnect(cl);
256 static bool get_next_connection(int fd)
258 struct ubus_client *cl;
261 client_fd = accept(fd, NULL, 0);
272 cl = ubusd_proto_new_client(client_fd, client_cb);
274 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
281 static void server_cb(struct uloop_fd *fd, unsigned int events)
286 next = get_next_connection(fd->fd);
290 static struct uloop_fd server_fd = {
294 static int usage(const char *progname)
296 fprintf(stderr, "Usage: %s [<options>]\n"
298 " -s <socket>: Set the unix domain socket to listen on\n"
303 int main(int argc, char **argv)
305 const char *ubus_socket = UBUS_UNIX_SOCKET;
309 signal(SIGPIPE, SIG_IGN);
313 while ((ch = getopt(argc, argv, "s:")) != -1) {
316 ubus_socket = optarg;
319 return usage(argv[0]);
324 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
325 if (server_fd.fd < 0) {
330 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);