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/* $OpenBSD: control.c,v 1.18 2020/02/12 19:14:56 otto Exp $ */
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/*
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* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
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* Copyright (c) 2012 Mike Miller <mmiller@mgm51.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <err.h>
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#include "ntpd.h"
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#define CONTROL_BACKLOG 5
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#define square(x) ((x) * (x))
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int
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control_check(char *path)
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{
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struct sockaddr_un sun;
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int fd;
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bzero(&sun, sizeof(sun));
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sun.sun_family = AF_UNIX;
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strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
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if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
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log_debug("control_check: socket check");
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return (-1);
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}
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if (connect(fd, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
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log_debug("control_check: socket in use");
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close(fd);
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return (-1);
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}
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close(fd);
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return (0);
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}
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int
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control_init(char *path)
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{
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struct sockaddr_un sa;
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int fd;
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mode_t old_umask;
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if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) == -1) {
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log_warn("control_init: socket");
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return (-1);
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}
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memset(&sa, 0, sizeof(sa));
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sa.sun_family = AF_UNIX;
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if (strlcpy(sa.sun_path, path, sizeof(sa.sun_path)) >=
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sizeof(sa.sun_path))
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errx(1, "ctl socket name too long");
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if (unlink(path) == -1)
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if (errno != ENOENT) {
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log_warn("control_init: unlink %s", path);
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close(fd);
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return (-1);
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}
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old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
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if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
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log_warn("control_init: bind: %s", path);
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close(fd);
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umask(old_umask);
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return (-1);
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}
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umask(old_umask);
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if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
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log_warn("control_init: chmod");
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close(fd);
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(void)unlink(path);
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return (-1);
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}
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session_socket_nonblockmode(fd);
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return (fd);
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}
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int
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control_listen(int fd)
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{
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if (fd != -1 && listen(fd, CONTROL_BACKLOG) == -1) {
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log_warn("control_listen: listen");
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return (-1);
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}
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return (0);
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}
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void
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control_shutdown(int fd)
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{
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close(fd);
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}
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int
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control_accept(int listenfd)
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{
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int connfd;
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socklen_t len;
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struct sockaddr_un sa;
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struct ctl_conn *ctl_conn;
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len = sizeof(sa);
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if ((connfd = accept(listenfd,
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(struct sockaddr *)&sa, &len)) == -1) {
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if (errno != EWOULDBLOCK && errno != EINTR)
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log_warn("control_accept: accept");
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return (0);
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}
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session_socket_nonblockmode(connfd);
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if ((ctl_conn = calloc(1, sizeof(struct ctl_conn))) == NULL) {
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log_warn("control_accept");
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close(connfd);
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return (0);
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}
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imsg_init(&ctl_conn->ibuf, connfd);
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TAILQ_INSERT_TAIL(&ctl_conns, ctl_conn, entry);
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return (1);
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}
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struct ctl_conn *
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control_connbyfd(int fd)
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{
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struct ctl_conn *c;
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TAILQ_FOREACH(c, &ctl_conns, entry) {
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if (c->ibuf.fd == fd)
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break;
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}
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return (c);
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}
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int
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control_close(int fd)
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{
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struct ctl_conn *c;
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if ((c = control_connbyfd(fd)) == NULL) {
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log_warn("control_close: fd %d: not found", fd);
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return (0);
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}
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msgbuf_clear(&c->ibuf.w);
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TAILQ_REMOVE(&ctl_conns, c, entry);
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close(c->ibuf.fd);
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free(c);
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return (1);
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}
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int
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control_dispatch_msg(struct pollfd *pfd, u_int *ctl_cnt)
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{
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struct imsg imsg;
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struct ctl_conn *c;
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struct ntp_peer *p;
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struct ntp_sensor *s;
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struct ctl_show_status c_status;
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struct ctl_show_peer c_peer;
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struct ctl_show_sensor c_sensor;
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int cnt;
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ssize_t n;
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if ((c = control_connbyfd(pfd->fd)) == NULL) {
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log_warn("control_dispatch_msg: fd %d: not found", pfd->fd);
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return (0);
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}
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if (pfd->revents & POLLOUT)
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if (msgbuf_write(&c->ibuf.w) <= 0 && errno != EAGAIN) {
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*ctl_cnt -= control_close(pfd->fd);
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return (1);
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}
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if (!(pfd->revents & POLLIN))
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return (0);
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if (((n = imsg_read(&c->ibuf)) == -1 && errno != EAGAIN) || n == 0) {
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*ctl_cnt -= control_close(pfd->fd);
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return (1);
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}
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for (;;) {
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if ((n = imsg_get(&c->ibuf, &imsg)) == -1) {
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*ctl_cnt -= control_close(pfd->fd);
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return (1);
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}
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if (n == 0)
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break;
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switch (imsg.hdr.type) {
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case IMSG_CTL_SHOW_STATUS:
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build_show_status(&c_status);
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_STATUS, 0, 0, -1,
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&c_status, sizeof (c_status));
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break;
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case IMSG_CTL_SHOW_PEERS:
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cnt = 0;
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TAILQ_FOREACH(p, &conf->ntp_peers, entry) {
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build_show_peer(&c_peer, p);
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS,
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0, 0, -1, &c_peer, sizeof(c_peer));
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cnt++;
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}
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS_END,
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0, 0, -1, &cnt, sizeof(cnt));
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break;
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case IMSG_CTL_SHOW_SENSORS:
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cnt = 0;
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TAILQ_FOREACH(s, &conf->ntp_sensors, entry) {
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build_show_sensor(&c_sensor, s);
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS,
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0, 0, -1, &c_sensor, sizeof(c_sensor));
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cnt++;
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}
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS_END,
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0, 0, -1, &cnt, sizeof(cnt));
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break;
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case IMSG_CTL_SHOW_ALL:
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build_show_status(&c_status);
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_STATUS, 0, 0, -1,
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&c_status, sizeof (c_status));
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cnt = 0;
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TAILQ_FOREACH(p, &conf->ntp_peers, entry) {
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build_show_peer(&c_peer, p);
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS,
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0, 0, -1, &c_peer, sizeof(c_peer));
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cnt++;
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}
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS_END,
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0, 0, -1, &cnt, sizeof(cnt));
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cnt = 0;
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TAILQ_FOREACH(s, &conf->ntp_sensors, entry) {
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build_show_sensor(&c_sensor, s);
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS,
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0, 0, -1, &c_sensor, sizeof(c_sensor));
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cnt++;
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}
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS_END,
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0, 0, -1, &cnt, sizeof(cnt));
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imsg_compose(&c->ibuf, IMSG_CTL_SHOW_ALL_END,
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0, 0, -1, NULL, 0);
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break;
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default:
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break;
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}
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imsg_free(&imsg);
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}
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return (0);
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}
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void
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session_socket_nonblockmode(int fd)
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{
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int flags;
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if ((flags = fcntl(fd, F_GETFL)) == -1)
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fatal("fcntl F_GETFL");
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flags |= O_NONBLOCK;
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if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
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fatal("fcntl F_SETFL");
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}
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void
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build_show_status(struct ctl_show_status *cs)
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{
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struct ntp_peer *p;
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struct ntp_sensor *s;
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cs->peercnt = cs->valid_peers = 0;
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cs->sensorcnt = cs->valid_sensors = 0;
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TAILQ_FOREACH(p, &conf->ntp_peers, entry) {
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cs->peercnt++;
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if (p->trustlevel >= TRUSTLEVEL_BADPEER)
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cs->valid_peers++;
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}
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TAILQ_FOREACH(s, &conf->ntp_sensors, entry) {
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cs->sensorcnt++;
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if (s->update.good)
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cs->valid_sensors++;
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}
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cs->synced = conf->status.synced;
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cs->stratum = conf->status.stratum;
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cs->clock_offset = getoffset() * 1000.0;
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cs->constraints = !TAILQ_EMPTY(&conf->constraints);
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cs->constraint_median = conf->constraint_median;
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cs->constraint_last = conf->constraint_last;
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cs->constraint_errors = conf->constraint_errors;
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}
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void
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build_show_peer(struct ctl_show_peer *cp, struct ntp_peer *p)
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{
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const char *a = "not resolved";
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const char *pool = "", *addr_head_name = "";
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const char *auth = "";
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u_int8_t shift, best, validdelaycnt, jittercnt;
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time_t now;
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now = getmonotime();
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if (p->addr) {
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a = log_sockaddr((struct sockaddr *)&p->addr->ss);
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if (p->addr->notauth)
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auth = " (non-dnssec lookup)";
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}
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if (p->addr_head.pool)
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pool = "from pool ";
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if (0 != strcmp(a, p->addr_head.name) || p->addr_head.pool)
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addr_head_name = p->addr_head.name;
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snprintf(cp->peer_desc, sizeof(cp->peer_desc),
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"%s %s%s%s", a, pool, addr_head_name, auth);
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validdelaycnt = best = 0;
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cp->offset = cp->delay = 0.0;
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for (shift = 0; shift < OFFSET_ARRAY_SIZE; shift++) {
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if (p->reply[shift].delay > 0.0) {
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cp->offset += p->reply[shift].offset;
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cp->delay += p->reply[shift].delay;
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if (p->reply[shift].delay < p->reply[best].delay)
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best = shift;
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validdelaycnt++;
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}
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}
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if (validdelaycnt > 1) {
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cp->offset /= validdelaycnt;
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cp->delay /= validdelaycnt;
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}
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jittercnt = 0;
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cp->jitter = 0.0;
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for (shift = 0; shift < OFFSET_ARRAY_SIZE; shift++) {
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if (p->reply[shift].delay > 0.0 && shift != best) {
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cp->jitter += square(p->reply[shift].delay -
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p->reply[best].delay);
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jittercnt++;
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}
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}
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if (jittercnt > 1)
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cp->jitter /= jittercnt;
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cp->jitter = sqrt(cp->jitter);
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if (p->shift == 0)
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shift = OFFSET_ARRAY_SIZE - 1;
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else
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shift = p->shift - 1;
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if (conf->status.synced == 1 &&
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p->reply[shift].status.send_refid == conf->status.refid)
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cp->syncedto = 1;
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else
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cp->syncedto = 0;
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/* milliseconds to reduce number of leading zeroes */
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cp->offset *= 1000.0;
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cp->delay *= 1000.0;
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cp->jitter *= 1000.0;
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cp->weight = p->weight;
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cp->trustlevel = p->trustlevel;
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cp->stratum = p->reply[shift].status.stratum;
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cp->next = p->next - now < 0 ? 0 : p->next - now;
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cp->poll = p->poll;
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}
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void
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build_show_sensor(struct ctl_show_sensor *cs, struct ntp_sensor *s)
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{
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time_t now;
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u_int8_t shift;
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u_int32_t refid;
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now = getmonotime();
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memcpy(&refid, SENSOR_DEFAULT_REFID, sizeof(refid));
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refid = refid == s->refid ? 0 : s->refid;
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snprintf(cs->sensor_desc, sizeof(cs->sensor_desc),
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"%s %.4s", s->device, (char *)&refid);
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if (s->shift == 0)
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shift = SENSOR_OFFSETS - 1;
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else
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shift = s->shift - 1;
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if (conf->status.synced == 1 &&
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s->offsets[shift].status.send_refid == conf->status.refid)
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cs->syncedto = 1;
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else
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cs->syncedto = 0;
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|
|
|
cs->weight = s->weight;
|
|
|
cs->good = s->update.good;
|
|
|
cs->stratum = s->offsets[shift].status.stratum;
|
|
|
cs->next = s->next - now < 0 ? 0 : s->next - now;
|
|
|
cs->poll = SENSOR_QUERY_INTERVAL;
|
|
|
cs->offset = s->offsets[shift].offset * 1000.0;
|
|
|
cs->correction = (double)s->correction / 1000.0;
|
|
|
}
|