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)
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);
173 static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
175 return cl->tx_queue[cl->txq_cur];
178 static void ubus_msg_dequeue(struct ubus_client *cl)
180 struct ubus_msg_buf *ub = ubus_msg_head(cl);
187 cl->tx_queue[cl->txq_cur] = NULL;
188 cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
191 static void handle_client_disconnect(struct ubus_client *cl)
193 while (ubus_msg_head(cl))
194 ubus_msg_dequeue(cl);
196 ubusd_monitor_disconnect(cl);
197 ubusd_proto_free_client(cl);
198 if (cl->pending_msg_fd >= 0)
199 close(cl->pending_msg_fd);
200 uloop_fd_delete(&cl->sock);
205 static void client_cb(struct uloop_fd *sock, unsigned int events)
207 struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
208 struct ubus_msg_buf *ub;
209 static struct iovec iov;
215 .cmsg_type = SCM_RIGHTS,
216 .cmsg_level = SOL_SOCKET,
217 .cmsg_len = sizeof(fd_buf),
220 struct msghdr msghdr = {
225 /* first try to tx more pending data */
226 while ((ub = ubus_msg_head(cl))) {
229 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
241 cl->txq_ofs += written;
242 if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
245 ubus_msg_dequeue(cl);
248 /* prevent further ULOOP_WRITE events if we don't have data
250 if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
251 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
254 if (!sock->eof && cl->pending_msg_offset < sizeof(cl->hdrbuf)) {
255 int offset = cl->pending_msg_offset;
260 iov.iov_base = ((char *) &cl->hdrbuf) + offset;
261 iov.iov_len = sizeof(cl->hdrbuf) - offset;
263 if (cl->pending_msg_fd < 0) {
264 msghdr.msg_control = &fd_buf;
265 msghdr.msg_controllen = sizeof(fd_buf);
267 msghdr.msg_control = NULL;
268 msghdr.msg_controllen = 0;
271 bytes = recvmsg(sock->fd, &msghdr, 0);
276 cl->pending_msg_fd = fd_buf.fd;
278 cl->pending_msg_offset += bytes;
279 if (cl->pending_msg_offset < sizeof(cl->hdrbuf))
282 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
285 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
286 if (!cl->pending_msg)
289 cl->hdrbuf.hdr.seq = be16_to_cpu(cl->hdrbuf.hdr.seq);
290 cl->hdrbuf.hdr.peer = be32_to_cpu(cl->hdrbuf.hdr.peer);
292 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
293 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
296 ub = cl->pending_msg;
298 int offset = cl->pending_msg_offset - sizeof(ub->hdr);
299 int len = blob_raw_len(ub->data) - offset;
303 bytes = read(sock->fd, (char *) ub->data + offset, len);
309 cl->pending_msg_offset += bytes;
314 ub->fd = cl->pending_msg_fd;
315 cl->pending_msg_fd = -1;
316 cl->pending_msg_offset = 0;
317 cl->pending_msg = NULL;
318 ubusd_monitor_message(cl, ub, false);
319 ubusd_proto_receive_message(cl, ub);
324 if (!sock->eof || ubus_msg_head(cl))
328 handle_client_disconnect(cl);
331 static bool get_next_connection(int fd)
333 struct ubus_client *cl;
336 client_fd = accept(fd, NULL, 0);
347 cl = ubusd_proto_new_client(client_fd, client_cb);
349 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
356 static void server_cb(struct uloop_fd *fd, unsigned int events)
361 next = get_next_connection(fd->fd);
365 static struct uloop_fd server_fd = {
369 static int usage(const char *progname)
371 fprintf(stderr, "Usage: %s [<options>]\n"
373 " -A <path>: Set the path to ACL files\n"
374 " -s <socket>: Set the unix domain socket to listen on\n"
379 static void sighup_handler(int sig)
384 int main(int argc, char **argv)
386 const char *ubus_socket = UBUS_UNIX_SOCKET;
390 signal(SIGPIPE, SIG_IGN);
391 signal(SIGHUP, sighup_handler);
393 openlog("ubusd", LOG_PID, LOG_DAEMON);
396 while ((ch = getopt(argc, argv, "A:s:")) != -1) {
399 ubus_socket = optarg;
402 ubusd_acl_dir = optarg;
405 return usage(argv[0]);
411 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
412 if (server_fd.fd < 0) {
417 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);