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/* $OpenBSD: ntp.c,v 1.7 2004/06/17 19:17:48 henning Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
* Copyright (c) 2004 Alexander Guy <alexander.guy@andern.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <errno.h>
#include <poll.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ntpd.h"
#include "ntp.h"
#define PFD_PIPE_MAIN 0
volatile sig_atomic_t ntp_quit = 0;
struct imsgbuf ibuf_main;
struct l_fixedpt ref_ts;
void ntp_sighdlr(int);
int ntp_dispatch_imsg(void);
int ntp_dispatch(int fd);
void
ntp_sighdlr(int sig)
{
switch (sig) {
case SIGINT:
case SIGTERM:
ntp_quit = 1;
break;
}
}
pid_t
ntp_main(int pipe_prnt[2], struct ntpd_conf *conf)
{
int nfds, i, j, idx_peers, timeout;
pid_t pid;
struct pollfd pfd[OPEN_MAX];
struct passwd *pw;
struct servent *se;
struct listen_addr *la;
struct ntp_peer *p;
struct ntp_peer *idx2peer[OPEN_MAX];
time_t nextaction;
switch (pid = fork()) {
case -1:
fatal("cannot fork");
case 0:
break;
default:
return (pid);
}
if ((se = getservbyname("ntp", "udp")) == NULL)
fatal("getservbyname");
if ((pw = getpwnam(NTPD_USER)) == NULL)
fatal(NULL);
if (chroot(pw->pw_dir) == -1)
fatal("chroot");
if (chdir("/") == -1)
fatal("chdir(\"/\")");
setproctitle("ntp engine");
setup_listeners(se, conf);
if (setgroups(1, &pw->pw_gid) ||
setegid(pw->pw_gid) || setgid(pw->pw_gid) ||
seteuid(pw->pw_uid) || setuid(pw->pw_uid))
fatal("can't drop privileges");
endpwent();
endservent();
signal(SIGTERM, ntp_sighdlr);
signal(SIGINT, ntp_sighdlr);
signal(SIGPIPE, SIG_IGN);
close(pipe_prnt[0]);
imsg_init(&ibuf_main, pipe_prnt[1]);
TAILQ_FOREACH(p, &conf->ntp_peers, entry)
client_peer_init(p);
log_info("ntp engine ready");
while (ntp_quit == 0) {
bzero(&pfd, sizeof(pfd));
bzero(idx2peer, sizeof(idx2peer));
nextaction = time(NULL) + 240;
pfd[PFD_PIPE_MAIN].fd = ibuf_main.fd;
pfd[PFD_PIPE_MAIN].events = POLLIN;
if (ibuf_main.w.queued > 0)
pfd[PFD_PIPE_MAIN].events |= POLLOUT;
i = 1;
TAILQ_FOREACH(la, &conf->listen_addrs, entry) {
pfd[i].fd = la->fd;
pfd[i].events = POLLIN;
i++;
if (i > OPEN_MAX)
fatal("i > OPEN_MAX");
}
idx_peers = i;
TAILQ_FOREACH(p, &conf->ntp_peers, entry) {
if (p->next > 0 && p->next < nextaction)
nextaction = p->next;
if ((p->next > 0 && p->next <= time(NULL)) ||
(p->deadline > 0 && p->deadline <= time(NULL)))
client_query(p);
if (p->state == STATE_QUERY_SENT) {
pfd[i].fd = p->query->fd;
pfd[i].events = POLLIN;
idx2peer[i - idx_peers] = p;
i++;
if (i > OPEN_MAX)
fatal("i > OPEN_MAX");
}
}
timeout = nextaction - time(NULL);
if (timeout < 0)
timeout = 0;
if ((nfds = poll(pfd, i, timeout * 1000)) == -1)
if (errno != EINTR) {
log_warn("poll error");
ntp_quit = 1;
}
if (nfds > 0 && (pfd[PFD_PIPE_MAIN].revents & POLLOUT))
if (msgbuf_write(&ibuf_main.w) < 0) {
log_warn("pipe write error (to parent)");
ntp_quit = 1;
}
if (nfds > 0 && pfd[PFD_PIPE_MAIN].revents & POLLIN) {
nfds--;
if (ntp_dispatch_imsg() == -1)
ntp_quit = 1;
}
for (j = 1; nfds > 0 && j < idx_peers; j++)
if (pfd[j].revents & POLLIN) {
nfds--;
if (ntp_dispatch(pfd[j].fd) == -1)
ntp_quit = 1;
}
for (; nfds > 0 && j < i; j++)
if (pfd[j].revents & POLLIN) {
nfds--;
if (client_dispatch(idx2peer[j - idx_peers]) ==
-1)
ntp_quit = 1;
}
}
msgbuf_write(&ibuf_main.w);
msgbuf_clear(&ibuf_main.w);
log_info("ntp engine exiting");
_exit(0);
}
int
ntp_dispatch_imsg(void)
{
struct imsg imsg;
int n;
if ((n = imsg_read(&ibuf_main)) == -1)
return (-1);
if (n == 0) { /* connection closed */
log_warnx("ntp_dispatch_imsg in ntp engine: pipe closed");
return (-1);
}
for (;;) {
if ((n = imsg_get(&ibuf_main, &imsg)) == -1)
return (-1);
if (n == 0)
break;
switch (imsg.hdr.type) {
default:
break;
}
imsg_free(&imsg);
}
return (0);
}
int
ntp_dispatch(int fd)
{
struct sockaddr_storage fsa;
socklen_t fsa_len;
char buf[NTP_MSGSIZE];
ssize_t size;
struct ntp_msg msg;
fsa_len = sizeof(fsa);
if ((size = recvfrom(fd, &buf, sizeof(buf), 0,
(struct sockaddr *)&fsa, &fsa_len)) == -1)
fatal("recvfrom");
ntp_getmsg(buf, size, &msg);
ntp_reply(fd, (struct sockaddr *)&fsa, &msg, 0);
return (0);
}
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