static void daemon_select_loop (fd_set serverfds, fd_set sslfds, int maxfd)
{
fd_set rdfds;
int nselect;
for (;;) {
if (reload) daemon_reload ();
if (terminate) daemon_terminate ();
rdfds = serverfds;
errno = 0;
nselect = select (maxfd + 1, &rdfds, NULL, NULL, NULL);
if (nselect == -1) {
switch (errno)
{
case EINTR:
break;
default:
syslog(LOG_DEBUG, "select=%d err=%m", nselect); break;
}
} else { // nselect == 0 doesn't happen
for (int fd = 0; fd <= maxfd && nselect > 0; fd++) {
if (! FD_ISSET (fd, &rdfds)) continue;
nselect--;
daemon_accept (fd, serverfds, sslfds, maxfd);
}
}
}
}
int run_daemon() {
if (getuid() != 0 || getgid() != 0) {
PLOGE("daemon requires root. uid/gid not root");
return -1;
}
prepare();
int fd;
struct sockaddr_un sun;
fd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (fd < 0) {
PLOGE("socket");
return -1;
}
if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
PLOGE("fcntl FD_CLOEXEC");
goto err;
}
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_LOCAL;
sprintf(sun.sun_path, "%s/server", REQUESTOR_DAEMON_PATH);
/*
* Delete the socket to protect from situations when
* something bad occured previously and the kernel reused pid from that process.
* Small probability, isn't it.
*/
unlink(sun.sun_path);
unlink(REQUESTOR_DAEMON_PATH);
int previous_umask = umask(027);
mkdir(REQUESTOR_DAEMON_PATH, 0777);
memset(sun.sun_path, 0, sizeof(sun.sun_path));
memcpy(sun.sun_path, "\0" "SUPERUSER", strlen("SUPERUSER") + 1);
if (bind(fd, (struct sockaddr*)&sun, sizeof(sun)) < 0) {
PLOGE("daemon bind");
goto err;
}
chmod(REQUESTOR_DAEMON_PATH, 0755);
chmod(sun.sun_path, 0777);
umask(previous_umask);
if (listen(fd, 10) < 0) {
PLOGE("daemon listen");
goto err;
}
int client;
while ((client = accept(fd, NULL, NULL)) > 0) {
if (fork_zero_fucks() == 0) {
close(fd);
return daemon_accept(client);
}
else {
close(client);
}
}
LOGE("daemon exiting");
err:
close(fd);
return -1;
}
