Mirror of the official OpenWrt ubus repository https://git.openwrt.org/project/ubus
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/*
* Copyright (C) 2011-2014 Felix Fietkau <nbd@openwrt.org>
*
* SPDX-License-Identifier: LGPL-2.1-only
*/
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef FreeBSD
#include <sys/param.h>
#endif
#include <string.h>
#include <syslog.h>
#include <libubox/usock.h>
#include "ubusd.h"
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);
uint8_t fd_buf[CMSG_SPACE(sizeof(int))] = { 0 };
struct msghdr msghdr = { 0 };
struct ubus_msg_buf *ub;
static struct iovec iov;
struct cmsghdr *cmsg;
int *pfd;
msghdr.msg_iov = &iov,
msghdr.msg_iovlen = 1,
msghdr.msg_control = fd_buf;
msghdr.msg_controllen = sizeof(fd_buf);
cmsg = CMSG_FIRSTHDR(&msghdr);
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
pfd = (int *) CMSG_DATA(cmsg);
msghdr.msg_controllen = cmsg->cmsg_len;
/* first try to tx more pending data */
while ((ub = ubus_msg_head(cl))) {
ssize_t 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 < (int) sizeof(cl->hdrbuf)) {
int offset = cl->pending_msg_offset;
int bytes;
*pfd = -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 = cmsg->cmsg_len;
} else {
msghdr.msg_control = NULL;
msghdr.msg_controllen = 0;
}
bytes = recvmsg(sock->fd, &msghdr, 0);
if (bytes < 0)
goto out;
if (*pfd >= 0)
cl->pending_msg_fd = *pfd;
cl->pending_msg_offset += bytes;
if (cl->pending_msg_offset < (int) 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;
cl->hdrbuf.hdr.seq = be16_to_cpu(cl->hdrbuf.hdr.seq);
cl->hdrbuf.hdr.peer = be32_to_cpu(cl->hdrbuf.hdr.peer);
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"
" -A <path>: Set the path to ACL files\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();
}
static void mkdir_sockdir()
{
char *ubus_sock_dir, *tmp;
ubus_sock_dir = strdup(UBUS_UNIX_SOCKET);
tmp = strrchr(ubus_sock_dir, '/');
if (tmp) {
*tmp = '\0';
mkdir(ubus_sock_dir, 0755);
}
free(ubus_sock_dir);
}
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, "A:s:")) != -1) {
switch (ch) {
case 's':
ubus_socket = optarg;
break;
case 'A':
ubusd_acl_dir = optarg;
break;
default:
return usage(argv[0]);
}
}
mkdir_sockdir();
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;
}