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>
22 #include <libubox/blob.h>
23 #include <libubox/uloop.h>
24 #include <libubox/usock.h>
25 #include <libubox/list.h>
29 static struct ubus_msg_buf *ubus_msg_unshare(struct ubus_msg_buf *ub)
31 ub = realloc(ub, sizeof(*ub) + ub->len);
36 memcpy(ub + 1, ub->data, ub->len);
37 ub->data = (void *) (ub + 1);
41 static struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub)
43 if (ub->refcount == ~0)
44 return ubus_msg_unshare(ub);
50 struct ubus_msg_buf *ubus_msg_new(void *data, int len, bool shared)
52 struct ubus_msg_buf *ub;
53 int buflen = sizeof(*ub);
58 ub = calloc(1, buflen);
67 ub->data = (void *) (ub + 1);
69 memcpy(ub + 1, data, len);
76 void ubus_msg_free(struct ubus_msg_buf *ub)
78 switch (ub->refcount) {
89 static int ubus_msg_writev(int fd, struct ubus_msg_buf *ub, int offset)
93 if (offset < sizeof(ub->hdr)) {
94 iov[0].iov_base = ((char *) &ub->hdr) + offset;
95 iov[0].iov_len = sizeof(ub->hdr) - offset;
96 iov[1].iov_base = (char *) ub->data;
97 iov[1].iov_len = ub->len;
98 return writev(fd, iov, 2);
100 offset -= sizeof(ub->hdr);
101 return write(fd, ((char *) ub->data) + offset, ub->len - offset);
105 static void ubus_msg_enqueue(struct ubus_client *cl, struct ubus_msg_buf *ub)
107 if (cl->tx_queue[cl->txq_tail])
110 cl->tx_queue[cl->txq_tail] = ubus_msg_ref(ub);
111 cl->txq_tail = (cl->txq_tail + 1) % ARRAY_SIZE(cl->tx_queue);
114 /* takes the msgbuf reference */
115 void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free)
119 if (!cl->tx_queue[cl->txq_cur]) {
120 written = ubus_msg_writev(cl->sock.fd, ub, 0);
121 if (written >= ub->len + sizeof(ub->hdr))
127 cl->txq_ofs = written;
129 /* get an event once we can write to the socket again */
130 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
132 ubus_msg_enqueue(cl, ub);
139 static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
141 return cl->tx_queue[cl->txq_cur];
144 static void ubus_msg_dequeue(struct ubus_client *cl)
146 struct ubus_msg_buf *ub = ubus_msg_head(cl);
153 cl->tx_queue[cl->txq_cur] = NULL;
154 cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
157 static void handle_client_disconnect(struct ubus_client *cl)
159 while (ubus_msg_head(cl))
160 ubus_msg_dequeue(cl);
162 ubusd_proto_free_client(cl);
163 uloop_fd_delete(&cl->sock);
168 static void client_cb(struct uloop_fd *sock, unsigned int events)
170 struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
171 struct ubus_msg_buf *ub;
173 /* first try to tx more pending data */
174 while ((ub = ubus_msg_head(cl))) {
177 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
189 cl->txq_ofs += written;
190 if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
193 ubus_msg_dequeue(cl);
196 /* prevent further ULOOP_WRITE events if we don't have data
198 if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
199 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
202 if (!sock->eof && cl->pending_msg_offset < sizeof(cl->hdrbuf)) {
203 int offset = cl->pending_msg_offset;
206 bytes = read(sock->fd, (char *)&cl->hdrbuf + offset, sizeof(cl->hdrbuf) - offset);
210 cl->pending_msg_offset += bytes;
211 if (cl->pending_msg_offset < sizeof(cl->hdrbuf))
214 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
217 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
218 if (!cl->pending_msg)
221 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
222 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
225 ub = cl->pending_msg;
227 int offset = cl->pending_msg_offset - sizeof(ub->hdr);
228 int len = blob_raw_len(ub->data) - offset;
232 bytes = read(sock->fd, (char *) ub->data + offset, len);
238 cl->pending_msg_offset += bytes;
243 cl->pending_msg_offset = 0;
244 cl->pending_msg = NULL;
245 ubusd_proto_receive_message(cl, ub);
250 if (!sock->eof || ubus_msg_head(cl))
254 handle_client_disconnect(cl);
257 static bool get_next_connection(int fd)
259 struct ubus_client *cl;
262 client_fd = accept(fd, NULL, 0);
273 cl = ubusd_proto_new_client(client_fd, client_cb);
275 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
282 static void server_cb(struct uloop_fd *fd, unsigned int events)
287 next = get_next_connection(fd->fd);
291 static struct uloop_fd server_fd = {
295 static int usage(const char *progname)
297 fprintf(stderr, "Usage: %s [<options>]\n"
299 " -s <socket>: Set the unix domain socket to listen on\n"
304 int main(int argc, char **argv)
306 const char *ubus_socket = UBUS_UNIX_SOCKET;
310 signal(SIGPIPE, SIG_IGN);
314 while ((ch = getopt(argc, argv, "s:")) != -1) {
317 ubus_socket = optarg;
320 return usage(argv[0]);
326 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
327 if (server_fd.fd < 0) {
332 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);