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- /*
- * Copyright (C) 2011-2014 Felix Fietkau <nbd@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #include <sys/socket.h>
- #include <sys/stat.h>
- #include <sys/uio.h>
- #ifdef FreeBSD
- #include <sys/param.h>
- #endif
- #include <syslog.h>
- #include <signal.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <fcntl.h>
- #include <libubox/blob.h>
- #include <libubox/uloop.h>
- #include <libubox/usock.h>
- #include <libubox/list.h>
- #include "ubusd.h"
- static struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub)
- {
- if (ub->refcount == ~0)
- return ubus_msg_new(ub->data, ub->len, false);
- ub->refcount++;
- return ub;
- }
- struct ubus_msg_buf *ubus_msg_new(void *data, int len, bool shared)
- {
- struct ubus_msg_buf *ub;
- int buflen = sizeof(*ub);
- if (!shared)
- buflen += len;
- ub = calloc(1, buflen);
- if (!ub)
- return NULL;
- ub->fd = -1;
- if (shared) {
- ub->refcount = ~0;
- ub->data = data;
- } else {
- ub->refcount = 1;
- ub->data = (void *) (ub + 1);
- if (data)
- memcpy(ub + 1, data, len);
- }
- ub->len = len;
- return ub;
- }
- void ubus_msg_free(struct ubus_msg_buf *ub)
- {
- switch (ub->refcount) {
- case 1:
- case ~0:
- if (ub->fd >= 0)
- close(ub->fd);
- free(ub);
- break;
- default:
- ub->refcount--;
- break;
- }
- }
- static int ubus_msg_writev(int fd, struct ubus_msg_buf *ub, int offset)
- {
- static struct iovec iov[2];
- static struct {
- struct cmsghdr h;
- int fd;
- } fd_buf = {
- .h = {
- .cmsg_len = sizeof(fd_buf),
- .cmsg_level = SOL_SOCKET,
- .cmsg_type = SCM_RIGHTS,
- },
- };
- struct msghdr msghdr = {
- .msg_iov = iov,
- .msg_iovlen = ARRAY_SIZE(iov),
- .msg_control = &fd_buf,
- .msg_controllen = sizeof(fd_buf),
- };
- fd_buf.fd = ub->fd;
- if (ub->fd < 0) {
- msghdr.msg_control = NULL;
- msghdr.msg_controllen = 0;
- }
- if (offset < sizeof(ub->hdr)) {
- iov[0].iov_base = ((char *) &ub->hdr) + offset;
- iov[0].iov_len = sizeof(ub->hdr) - offset;
- iov[1].iov_base = (char *) ub->data;
- iov[1].iov_len = ub->len;
- return sendmsg(fd, &msghdr, 0);
- } else {
- offset -= sizeof(ub->hdr);
- return write(fd, ((char *) ub->data) + offset, ub->len - offset);
- }
- }
- static void ubus_msg_enqueue(struct ubus_client *cl, struct ubus_msg_buf *ub)
- {
- if (cl->tx_queue[cl->txq_tail])
- return;
- cl->tx_queue[cl->txq_tail] = ubus_msg_ref(ub);
- cl->txq_tail = (cl->txq_tail + 1) % ARRAY_SIZE(cl->tx_queue);
- }
- /* takes the msgbuf reference */
- void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub, bool free)
- {
- int written;
- if (ub->hdr.type != UBUS_MSG_MONITOR)
- ubusd_monitor_message(cl, ub, true);
- if (!cl->tx_queue[cl->txq_cur]) {
- written = ubus_msg_writev(cl->sock.fd, ub, 0);
- if (written >= ub->len + sizeof(ub->hdr))
- goto out;
- if (written < 0)
- written = 0;
- cl->txq_ofs = written;
- /* get an event once we can write to the socket again */
- uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
- }
- ubus_msg_enqueue(cl, ub);
- out:
- if (free)
- ubus_msg_free(ub);
- }
- static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
- {
- return cl->tx_queue[cl->txq_cur];
- }
- static void ubus_msg_dequeue(struct ubus_client *cl)
- {
- struct ubus_msg_buf *ub = ubus_msg_head(cl);
- if (!ub)
- return;
- ubus_msg_free(ub);
- cl->txq_ofs = 0;
- cl->tx_queue[cl->txq_cur] = NULL;
- cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
- }
- static void handle_client_disconnect(struct ubus_client *cl)
- {
- while (ubus_msg_head(cl))
- ubus_msg_dequeue(cl);
- ubusd_monitor_disconnect(cl);
- ubusd_proto_free_client(cl);
- if (cl->pending_msg_fd >= 0)
- close(cl->pending_msg_fd);
- uloop_fd_delete(&cl->sock);
- close(cl->sock.fd);
- free(cl);
- }
- static void client_cb(struct uloop_fd *sock, unsigned int events)
- {
- struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
- struct ubus_msg_buf *ub;
- static struct iovec iov;
- static struct {
- struct cmsghdr h;
- int fd;
- } fd_buf = {
- .h = {
- .cmsg_type = SCM_RIGHTS,
- .cmsg_level = SOL_SOCKET,
- .cmsg_len = sizeof(fd_buf),
- }
- };
- struct msghdr msghdr = {
- .msg_iov = &iov,
- .msg_iovlen = 1,
- };
- /* first try to tx more pending data */
- while ((ub = ubus_msg_head(cl))) {
- int written;
- written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
- if (written < 0) {
- switch(errno) {
- case EINTR:
- case EAGAIN:
- break;
- default:
- goto disconnect;
- }
- break;
- }
- cl->txq_ofs += written;
- if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
- break;
- ubus_msg_dequeue(cl);
- }
- /* prevent further ULOOP_WRITE events if we don't have data
- * to send anymore */
- if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
- uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
- retry:
- if (!sock->eof && cl->pending_msg_offset < sizeof(cl->hdrbuf)) {
- int offset = cl->pending_msg_offset;
- int bytes;
- fd_buf.fd = -1;
- iov.iov_base = ((char *) &cl->hdrbuf) + offset;
- iov.iov_len = sizeof(cl->hdrbuf) - offset;
- if (cl->pending_msg_fd < 0) {
- msghdr.msg_control = &fd_buf;
- msghdr.msg_controllen = sizeof(fd_buf);
- } else {
- msghdr.msg_control = NULL;
- msghdr.msg_controllen = 0;
- }
- bytes = recvmsg(sock->fd, &msghdr, 0);
- if (bytes < 0)
- goto out;
- if (fd_buf.fd >= 0)
- cl->pending_msg_fd = fd_buf.fd;
- cl->pending_msg_offset += bytes;
- if (cl->pending_msg_offset < sizeof(cl->hdrbuf))
- goto out;
- if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
- goto disconnect;
- cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
- if (!cl->pending_msg)
- goto disconnect;
- memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
- memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
- }
- ub = cl->pending_msg;
- if (ub) {
- int offset = cl->pending_msg_offset - sizeof(ub->hdr);
- int len = blob_raw_len(ub->data) - offset;
- int bytes = 0;
- if (len > 0) {
- bytes = read(sock->fd, (char *) ub->data + offset, len);
- if (bytes <= 0)
- goto out;
- }
- if (bytes < len) {
- cl->pending_msg_offset += bytes;
- goto out;
- }
- /* accept message */
- ub->fd = cl->pending_msg_fd;
- cl->pending_msg_fd = -1;
- cl->pending_msg_offset = 0;
- cl->pending_msg = NULL;
- ubusd_monitor_message(cl, ub, false);
- ubusd_proto_receive_message(cl, ub);
- goto retry;
- }
- out:
- if (!sock->eof || ubus_msg_head(cl))
- return;
- disconnect:
- handle_client_disconnect(cl);
- }
- static bool get_next_connection(int fd)
- {
- struct ubus_client *cl;
- int client_fd;
- client_fd = accept(fd, NULL, 0);
- if (client_fd < 0) {
- switch (errno) {
- case ECONNABORTED:
- case EINTR:
- return true;
- default:
- return false;
- }
- }
- cl = ubusd_proto_new_client(client_fd, client_cb);
- if (cl)
- uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
- else
- close(client_fd);
- return true;
- }
- static void server_cb(struct uloop_fd *fd, unsigned int events)
- {
- bool next;
- do {
- next = get_next_connection(fd->fd);
- } while (next);
- }
- static struct uloop_fd server_fd = {
- .cb = server_cb,
- };
- static int usage(const char *progname)
- {
- fprintf(stderr, "Usage: %s [<options>]\n"
- "Options: \n"
- " -s <socket>: Set the unix domain socket to listen on\n"
- "\n", progname);
- return 1;
- }
- static void sighup_handler(int sig)
- {
- ubusd_acl_load();
- }
- int main(int argc, char **argv)
- {
- const char *ubus_socket = UBUS_UNIX_SOCKET;
- int ret = 0;
- int ch;
- signal(SIGPIPE, SIG_IGN);
- signal(SIGHUP, sighup_handler);
- openlog("ubusd", LOG_PID, LOG_DAEMON);
- uloop_init();
- while ((ch = getopt(argc, argv, "s:")) != -1) {
- switch (ch) {
- case 's':
- ubus_socket = optarg;
- break;
- default:
- return usage(argv[0]);
- }
- }
- unlink(ubus_socket);
- umask(0111);
- server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
- if (server_fd.fd < 0) {
- perror("usock");
- ret = -1;
- goto out;
- }
- uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);
- ubusd_acl_load();
- uloop_run();
- unlink(ubus_socket);
- out:
- uloop_done();
- return ret;
- }
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