2 * Copyright (C) 2011-2014 Felix Fietkau <nbd@openwrt.org>
4 * SPDX-License-Identifier: LGPL-2.1-only
7 #include <sys/socket.h>
10 #include <sys/param.h>
14 #include <libubox/usock.h>
18 static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
20 return cl->tx_queue[cl->txq_cur];
23 static void ubus_msg_dequeue(struct ubus_client *cl)
25 struct ubus_msg_buf *ub = ubus_msg_head(cl);
32 cl->tx_queue[cl->txq_cur] = NULL;
33 cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
36 static void handle_client_disconnect(struct ubus_client *cl)
38 while (ubus_msg_head(cl))
41 ubusd_monitor_disconnect(cl);
42 ubusd_proto_free_client(cl);
43 if (cl->pending_msg_fd >= 0)
44 close(cl->pending_msg_fd);
45 uloop_fd_delete(&cl->sock);
50 static void client_cb(struct uloop_fd *sock, unsigned int events)
52 struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
53 uint8_t fd_buf[CMSG_SPACE(sizeof(int))] = { 0 };
54 struct msghdr msghdr = { 0 };
55 struct ubus_msg_buf *ub;
56 static struct iovec iov;
60 msghdr.msg_iov = &iov,
61 msghdr.msg_iovlen = 1,
62 msghdr.msg_control = fd_buf;
63 msghdr.msg_controllen = sizeof(fd_buf);
65 cmsg = CMSG_FIRSTHDR(&msghdr);
66 cmsg->cmsg_type = SCM_RIGHTS;
67 cmsg->cmsg_level = SOL_SOCKET;
68 cmsg->cmsg_len = CMSG_LEN(sizeof(int));
70 pfd = (int *) CMSG_DATA(cmsg);
71 msghdr.msg_controllen = cmsg->cmsg_len;
73 /* first try to tx more pending data */
74 while ((ub = ubus_msg_head(cl))) {
77 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
89 cl->txq_ofs += written;
90 if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
96 /* prevent further ULOOP_WRITE events if we don't have data
98 if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
99 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
102 if (!sock->eof && cl->pending_msg_offset < (int) sizeof(cl->hdrbuf)) {
103 int offset = cl->pending_msg_offset;
108 iov.iov_base = ((char *) &cl->hdrbuf) + offset;
109 iov.iov_len = sizeof(cl->hdrbuf) - offset;
111 if (cl->pending_msg_fd < 0) {
112 msghdr.msg_control = fd_buf;
113 msghdr.msg_controllen = cmsg->cmsg_len;
115 msghdr.msg_control = NULL;
116 msghdr.msg_controllen = 0;
119 bytes = recvmsg(sock->fd, &msghdr, 0);
124 cl->pending_msg_fd = *pfd;
126 cl->pending_msg_offset += bytes;
127 if (cl->pending_msg_offset < (int) sizeof(cl->hdrbuf))
130 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
133 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
134 if (!cl->pending_msg)
137 cl->hdrbuf.hdr.seq = be16_to_cpu(cl->hdrbuf.hdr.seq);
138 cl->hdrbuf.hdr.peer = be32_to_cpu(cl->hdrbuf.hdr.peer);
140 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
141 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
144 ub = cl->pending_msg;
146 int offset = cl->pending_msg_offset - sizeof(ub->hdr);
147 int len = blob_raw_len(ub->data) - offset;
151 bytes = read(sock->fd, (char *) ub->data + offset, len);
157 cl->pending_msg_offset += bytes;
162 ub->fd = cl->pending_msg_fd;
163 cl->pending_msg_fd = -1;
164 cl->pending_msg_offset = 0;
165 cl->pending_msg = NULL;
166 ubusd_monitor_message(cl, ub, false);
167 ubusd_proto_receive_message(cl, ub);
172 if (!sock->eof || ubus_msg_head(cl))
176 handle_client_disconnect(cl);
179 static bool get_next_connection(int fd)
181 struct ubus_client *cl;
184 client_fd = accept(fd, NULL, 0);
195 cl = ubusd_proto_new_client(client_fd, client_cb);
197 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
204 static void server_cb(struct uloop_fd *fd, unsigned int events)
209 next = get_next_connection(fd->fd);
213 static struct uloop_fd server_fd = {
217 static int usage(const char *progname)
219 fprintf(stderr, "Usage: %s [<options>]\n"
221 " -A <path>: Set the path to ACL files\n"
222 " -s <socket>: Set the unix domain socket to listen on\n"
227 static void sighup_handler(int sig)
232 int main(int argc, char **argv)
234 const char *ubus_socket = UBUS_UNIX_SOCKET;
238 signal(SIGPIPE, SIG_IGN);
239 signal(SIGHUP, sighup_handler);
241 openlog("ubusd", LOG_PID, LOG_DAEMON);
244 while ((ch = getopt(argc, argv, "A:s:")) != -1) {
247 ubus_socket = optarg;
250 ubusd_acl_dir = optarg;
253 return usage(argv[0]);
259 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
260 if (server_fd.fd < 0) {
265 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);