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/*
Copyright (c) 2004 The Regents of the University of Michigan.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/poll.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include "gssd.h"
#include "err_util.h"
extern struct pollfd *pollarray;
extern int pollsize;
#define POLL_MILLISECS 500
static volatile int dir_changed = 1;
static void dir_notify_handler(int sig, siginfo_t *si, void *data)
{
dir_changed = 1;
}
static void
scan_poll_results(int ret)
{
int i;
struct clnt_info *clp;
for (clp = clnt_list.tqh_first; clp != NULL; clp = clp->list.tqe_next)
{
i = clp->krb5_poll_index;
if (i >= 0 && pollarray[i].revents) {
if (pollarray[i].revents & POLLHUP)
dir_changed = 1;
if (pollarray[i].revents & POLLIN)
handle_krb5_upcall(clp);
pollarray[clp->krb5_poll_index].revents = 0;
ret--;
if (!ret)
break;
}
i = clp->spkm3_poll_index;
if (i >= 0 && pollarray[i].revents) {
if (pollarray[i].revents & POLLHUP)
dir_changed = 1;
if (pollarray[i].revents & POLLIN)
handle_spkm3_upcall(clp);
pollarray[clp->spkm3_poll_index].revents = 0;
ret--;
if (!ret)
break;
}
}
};
void
gssd_run()
{
int ret;
struct sigaction dn_act;
int fd;
/* Taken from linux/Documentation/dnotify.txt: */
dn_act.sa_sigaction = dir_notify_handler;
sigemptyset(&dn_act.sa_mask);
dn_act.sa_flags = SA_SIGINFO;
sigaction(DNOTIFY_SIGNAL, &dn_act, NULL);
if ((fd = open(pipefs_nfsdir, O_RDONLY)) == -1) {
printerr(0, "ERROR: failed to open %s: %s\n",
pipefs_nfsdir, strerror(errno));
exit(1);
}
fcntl(fd, F_SETSIG, DNOTIFY_SIGNAL);
fcntl(fd, F_NOTIFY, DN_CREATE|DN_DELETE|DN_MODIFY|DN_MULTISHOT);
init_client_list();
printerr(1, "beginning poll\n");
while (1) {
while (dir_changed) {
dir_changed = 0;
if (update_client_list()) {
printerr(0, "ERROR: couldn't update "
"client list\n");
exit(1);
}
}
/* race condition here: dir_changed could be set before we
* enter the poll, and we'd never notice if it weren't for the
* timeout. */
ret = poll(pollarray, pollsize, POLL_MILLISECS);
if (ret < 0) {
if (errno != EINTR)
printerr(0,
"WARNING: error return from poll\n");
} else if (ret == 0) {
/* timeout */
} else { /* ret > 0 */
scan_poll_results(ret);
}
}
close(fd);
return;
}
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