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/* $OpenBSD: ntpd.c,v 1.39 2005/07/11 08:08:06 dtucker Exp $ */
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/*
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* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
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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 MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF 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/socket.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <poll.h>
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#include <pwd.h>
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#include <resolv.h>
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#include <signal.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 "ntpd.h"
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void sighdlr(int);
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__dead void usage(void);
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int main(int, char *[]);
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int check_child(pid_t, const char *);
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int dispatch_imsg(struct ntpd_conf *);
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int ntpd_adjtime(double);
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void ntpd_settime(double);
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volatile sig_atomic_t quit = 0;
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volatile sig_atomic_t reconfig = 0;
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volatile sig_atomic_t sigchld = 0;
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struct imsgbuf *ibuf;
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void
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sighdlr(int sig)
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{
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switch (sig) {
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case SIGTERM:
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case SIGINT:
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quit = 1;
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break;
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case SIGCHLD:
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sigchld = 1;
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break;
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case SIGHUP:
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reconfig = 1;
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break;
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}
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}
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__dead void
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usage(void)
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{
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extern char *__progname;
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fprintf(stderr, "usage: %s [-dSs] [-f file]\n", __progname);
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exit(1);
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}
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#define POLL_MAX 8
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#define PFD_PIPE 0
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int
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main(int argc, char *argv[])
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{
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struct ntpd_conf conf;
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struct pollfd pfd[POLL_MAX];
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pid_t chld_pid = 0, pid;
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const char *conffile;
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int ch, nfds, timeout = INFTIM;
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int pipe_chld[2];
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conffile = CONFFILE;
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bzero(&conf, sizeof(conf));
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log_init(1); /* log to stderr until daemonized */
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res_init(); /* XXX */
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while ((ch = getopt(argc, argv, "df:sS")) != -1) {
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switch (ch) {
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case 'd':
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conf.debug = 1;
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break;
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case 'f':
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conffile = optarg;
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break;
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case 's':
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conf.settime = 1;
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break;
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case 'S':
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conf.settime = 0;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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if (parse_config(conffile, &conf))
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exit(1);
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if (geteuid()) {
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fprintf(stderr, "ntpd: need root privileges\n");
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exit(1);
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}
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if (getpwnam(NTPD_USER) == NULL) {
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fprintf(stderr, "ntpd: unknown user %s\n", NTPD_USER);
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exit(1);
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}
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endpwent();
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if (!conf.settime) {
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log_init(conf.debug);
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if (!conf.debug)
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if (daemon(1, 0))
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fatal("daemon");
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} else
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timeout = SETTIME_TIMEOUT * 1000;
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if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_chld) == -1)
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fatal("socketpair");
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/* fork child process */
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chld_pid = ntp_main(pipe_chld, &conf);
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setproctitle("[priv]");
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signal(SIGTERM, sighdlr);
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signal(SIGINT, sighdlr);
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signal(SIGCHLD, sighdlr);
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signal(SIGHUP, sighdlr);
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close(pipe_chld[1]);
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if ((ibuf = malloc(sizeof(struct imsgbuf))) == NULL)
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fatal(NULL);
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imsg_init(ibuf, pipe_chld[0]);
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while (quit == 0) {
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pfd[PFD_PIPE].fd = ibuf->fd;
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pfd[PFD_PIPE].events = POLLIN;
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if (ibuf->w.queued)
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pfd[PFD_PIPE].events |= POLLOUT;
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if ((nfds = poll(pfd, 1, timeout)) == -1)
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if (errno != EINTR) {
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log_warn("poll error");
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quit = 1;
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}
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if (nfds == 0 && conf.settime) {
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conf.settime = 0;
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timeout = INFTIM;
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log_init(conf.debug);
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log_debug("no reply received in time, skipping initial "
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"time setting");
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if (!conf.debug)
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if (daemon(1, 0))
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fatal("daemon");
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}
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if (nfds > 0 && (pfd[PFD_PIPE].revents & POLLOUT))
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if (msgbuf_write(&ibuf->w) < 0) {
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log_warn("pipe write error (to child)");
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quit = 1;
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}
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if (nfds > 0 && pfd[PFD_PIPE].revents & POLLIN) {
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nfds--;
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if (dispatch_imsg(&conf) == -1)
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quit = 1;
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}
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if (sigchld) {
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if (check_child(chld_pid, "child")) {
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quit = 1;
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chld_pid = 0;
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}
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sigchld = 0;
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}
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}
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signal(SIGCHLD, SIG_DFL);
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if (chld_pid)
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kill(chld_pid, SIGTERM);
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do {
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if ((pid = wait(NULL)) == -1 &&
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errno != EINTR && errno != ECHILD)
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fatal("wait");
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} while (pid != -1 || (pid == -1 && errno == EINTR));
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msgbuf_clear(&ibuf->w);
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free(ibuf);
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log_info("Terminating");
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return (0);
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}
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int
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check_child(pid_t pid, const char *pname)
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{
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int status, sig;
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char *signame;
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if (waitpid(pid, &status, WNOHANG) > 0) {
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if (WIFEXITED(status)) {
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log_warnx("Lost child: %s exited", pname);
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return (1);
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}
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if (WIFSIGNALED(status)) {
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sig = WTERMSIG(status);
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signame = strsignal(sig) ? strsignal(sig) : "unknown";
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log_warnx("Lost child: %s terminated; signal %d (%s)",
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pname, sig, signame);
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return (1);
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}
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}
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return (0);
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}
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int
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dispatch_imsg(struct ntpd_conf *conf)
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{
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struct imsg imsg;
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int n, cnt;
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double d;
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char *name;
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struct ntp_addr *h, *hn;
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struct buf *buf;
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if ((n = imsg_read(ibuf)) == -1)
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return (-1);
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if (n == 0) { /* connection closed */
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log_warnx("dispatch_imsg in main: pipe closed");
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return (-1);
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}
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for (;;) {
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if ((n = imsg_get(ibuf, &imsg)) == -1)
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return (-1);
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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_ADJTIME:
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if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(d))
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fatalx("invalid IMSG_ADJTIME received");
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memcpy(&d, imsg.data, sizeof(d));
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n = ntpd_adjtime(d);
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imsg_compose(ibuf, IMSG_ADJTIME, 0, 0, &n, sizeof(n));
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break;
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case IMSG_SETTIME:
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if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(d))
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fatalx("invalid IMSG_SETTIME received");
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if (!conf->settime)
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break;
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memcpy(&d, imsg.data, sizeof(d));
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ntpd_settime(d);
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/* daemonize now */
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log_init(conf->debug);
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if (!conf->debug)
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if (daemon(1, 0))
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fatal("daemon");
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conf->settime = 0;
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break;
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case IMSG_HOST_DNS:
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name = imsg.data;
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if (imsg.hdr.len < 1 + IMSG_HEADER_SIZE)
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fatalx("invalid IMSG_HOST_DNS received");
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imsg.hdr.len -= 1 + IMSG_HEADER_SIZE;
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if (name[imsg.hdr.len] != '\0' ||
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strlen(name) != imsg.hdr.len)
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fatalx("invalid IMSG_HOST_DNS received");
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cnt = host_dns(name, &hn);
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buf = imsg_create(ibuf, IMSG_HOST_DNS,
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imsg.hdr.peerid, 0,
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cnt * sizeof(struct sockaddr_storage));
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if (buf == NULL)
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break;
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if (cnt > 0)
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for (h = hn; h != NULL; h = h->next)
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imsg_add(buf, &h->ss, sizeof(h->ss));
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imsg_close(ibuf, buf);
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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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int
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ntpd_adjtime(double d)
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{
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struct timeval tv, olddelta;
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int synced = 0;
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static int firstadj = 1;
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if (d >= (double)LOG_NEGLIGEE / 1000 ||
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d <= -1 * (double)LOG_NEGLIGEE / 1000)
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log_info("adjusting local clock by %fs", d);
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else
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log_debug("adjusting local clock by %fs", d);
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d_to_tv(d, &tv);
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if (adjtime(&tv, &olddelta) == -1)
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log_warn("adjtime failed");
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else if (!firstadj && olddelta.tv_sec == 0 && olddelta.tv_usec == 0)
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synced = 1;
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firstadj = 0;
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return (synced);
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}
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void
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ntpd_settime(double d)
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{
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struct timeval tv, curtime;
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char buf[80];
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time_t tval;
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/* if the offset is small, don't call settimeofday */
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if (d < SETTIME_MIN_OFFSET && d > -SETTIME_MIN_OFFSET)
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return;
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if (gettimeofday(&curtime, NULL) == -1) {
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log_warn("gettimeofday");
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return;
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}
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d_to_tv(d, &tv);
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curtime.tv_usec += tv.tv_usec + 1000000;
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curtime.tv_sec += tv.tv_sec - 1 + (curtime.tv_usec / 1000000);
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curtime.tv_usec %= 1000000;
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if (settimeofday(&curtime, NULL) == -1) {
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log_warn("settimeofday");
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return;
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}
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tval = curtime.tv_sec;
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strftime(buf, sizeof(buf), "%a %b %e %H:%M:%S %Z %Y",
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localtime(&tval));
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log_info("set local clock to %s (offset %fs)", buf, d);
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}
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