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 <libubox/blob.h>
27 #include <libubox/uloop.h>
28 #include <libubox/usock.h>
29 #include <libubox/list.h>
33 static struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub)
35 struct ubus_msg_buf *new_ub;
36 if (ub->refcount == ~0) {
37 new_ub = ubus_msg_new(ub->data, ub->len, false);
40 memcpy(&new_ub->hdr, &ub->hdr, sizeof(struct ubus_msghdr));
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);
68 ub->data = (void *) (ub + 1);
70 memcpy(ub + 1, data, len);
77 void ubus_msg_free(struct ubus_msg_buf *ub)
79 switch (ub->refcount) {
93 static int ubus_msg_writev(int fd, struct ubus_msg_buf *ub, int offset)
95 static struct iovec iov[2];
101 .cmsg_len = sizeof(fd_buf),
102 .cmsg_level = SOL_SOCKET,
103 .cmsg_type = SCM_RIGHTS,
106 struct msghdr msghdr = {
108 .msg_iovlen = ARRAY_SIZE(iov),
109 .msg_control = &fd_buf,
110 .msg_controllen = sizeof(fd_buf),
115 msghdr.msg_control = NULL;
116 msghdr.msg_controllen = 0;
119 if (offset < sizeof(ub->hdr)) {
120 struct ubus_msghdr hdr;
122 hdr.version = ub->hdr.version;
123 hdr.type = ub->hdr.type;
124 hdr.seq = cpu_to_be16(ub->hdr.seq);
125 hdr.peer = cpu_to_be32(ub->hdr.peer);
127 iov[0].iov_base = ((char *) &hdr) + offset;
128 iov[0].iov_len = sizeof(hdr) - offset;
129 iov[1].iov_base = (char *) ub->data;
130 iov[1].iov_len = ub->len;
132 return sendmsg(fd, &msghdr, 0);
134 offset -= sizeof(ub->hdr);
135 return write(fd, ((char *) ub->data) + offset, ub->len - offset);
139 static void ubus_msg_enqueue(struct ubus_client *cl, struct ubus_msg_buf *ub)
141 if (cl->tx_queue[cl->txq_tail])
144 cl->tx_queue[cl->txq_tail] = ubus_msg_ref(ub);
145 cl->txq_tail = (cl->txq_tail + 1) % ARRAY_SIZE(cl->tx_queue);
148 /* takes the msgbuf reference */
149 void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free)
153 if (ub->hdr.type != UBUS_MSG_MONITOR)
154 ubusd_monitor_message(cl, ub, true);
156 if (!cl->tx_queue[cl->txq_cur]) {
157 written = ubus_msg_writev(cl->sock.fd, ub, 0);
162 if (written >= ub->len + sizeof(ub->hdr))
165 cl->txq_ofs = written;
167 /* get an event once we can write to the socket again */
168 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
170 ubus_msg_enqueue(cl, ub);
177 static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
179 return cl->tx_queue[cl->txq_cur];
182 static void ubus_msg_dequeue(struct ubus_client *cl)
184 struct ubus_msg_buf *ub = ubus_msg_head(cl);
191 cl->tx_queue[cl->txq_cur] = NULL;
192 cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
195 static void handle_client_disconnect(struct ubus_client *cl)
197 while (ubus_msg_head(cl))
198 ubus_msg_dequeue(cl);
200 ubusd_monitor_disconnect(cl);
201 ubusd_proto_free_client(cl);
202 if (cl->pending_msg_fd >= 0)
203 close(cl->pending_msg_fd);
204 uloop_fd_delete(&cl->sock);
209 static void client_cb(struct uloop_fd *sock, unsigned int events)
211 struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
212 struct ubus_msg_buf *ub;
213 static struct iovec iov;
219 .cmsg_type = SCM_RIGHTS,
220 .cmsg_level = SOL_SOCKET,
221 .cmsg_len = sizeof(fd_buf),
224 struct msghdr msghdr = {
229 /* first try to tx more pending data */
230 while ((ub = ubus_msg_head(cl))) {
233 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
245 cl->txq_ofs += written;
246 if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
249 ubus_msg_dequeue(cl);
252 /* prevent further ULOOP_WRITE events if we don't have data
254 if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
255 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
258 if (!sock->eof && cl->pending_msg_offset < sizeof(cl->hdrbuf)) {
259 int offset = cl->pending_msg_offset;
264 iov.iov_base = ((char *) &cl->hdrbuf) + offset;
265 iov.iov_len = sizeof(cl->hdrbuf) - offset;
267 if (cl->pending_msg_fd < 0) {
268 msghdr.msg_control = &fd_buf;
269 msghdr.msg_controllen = sizeof(fd_buf);
271 msghdr.msg_control = NULL;
272 msghdr.msg_controllen = 0;
275 bytes = recvmsg(sock->fd, &msghdr, 0);
280 cl->pending_msg_fd = fd_buf.fd;
282 cl->pending_msg_offset += bytes;
283 if (cl->pending_msg_offset < sizeof(cl->hdrbuf))
286 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
289 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
290 if (!cl->pending_msg)
293 cl->hdrbuf.hdr.seq = be16_to_cpu(cl->hdrbuf.hdr.seq);
294 cl->hdrbuf.hdr.peer = be32_to_cpu(cl->hdrbuf.hdr.peer);
296 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
297 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
300 ub = cl->pending_msg;
302 int offset = cl->pending_msg_offset - sizeof(ub->hdr);
303 int len = blob_raw_len(ub->data) - offset;
307 bytes = read(sock->fd, (char *) ub->data + offset, len);
313 cl->pending_msg_offset += bytes;
318 ub->fd = cl->pending_msg_fd;
319 cl->pending_msg_fd = -1;
320 cl->pending_msg_offset = 0;
321 cl->pending_msg = NULL;
322 ubusd_monitor_message(cl, ub, false);
323 ubusd_proto_receive_message(cl, ub);
328 if (!sock->eof || ubus_msg_head(cl))
332 handle_client_disconnect(cl);
335 static bool get_next_connection(int fd)
337 struct ubus_client *cl;
340 client_fd = accept(fd, NULL, 0);
351 cl = ubusd_proto_new_client(client_fd, client_cb);
353 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
360 static void server_cb(struct uloop_fd *fd, unsigned int events)
365 next = get_next_connection(fd->fd);
369 static struct uloop_fd server_fd = {
373 static int usage(const char *progname)
375 fprintf(stderr, "Usage: %s [<options>]\n"
377 " -A <path>: Set the path to ACL files\n"
378 " -s <socket>: Set the unix domain socket to listen on\n"
383 static void sighup_handler(int sig)
388 int main(int argc, char **argv)
390 const char *ubus_socket = UBUS_UNIX_SOCKET;
394 signal(SIGPIPE, SIG_IGN);
395 signal(SIGHUP, sighup_handler);
397 openlog("ubusd", LOG_PID, LOG_DAEMON);
400 while ((ch = getopt(argc, argv, "A:s:")) != -1) {
403 ubus_socket = optarg;
406 ubusd_acl_dir = optarg;
409 return usage(argv[0]);
415 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
416 if (server_fd.fd < 0) {
421 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);