/* Initialize libevent and start the event loop */
void
levent_loop(struct lldpd *cfg)
{
levent_init(cfg);
lldpd_loop(cfg);
/* libevent loop */
do {
if (event_base_got_break(cfg->g_base) ||
event_base_got_exit(cfg->g_base))
break;
#ifdef USE_SNMP
if (cfg->g_snmp) {
/* We don't use delegated requests (request
whose answer is delayed). However, we keep
the call here in case we use it some
day. We don't call run_alarms() here. We do
it on timeout only. */
netsnmp_check_outstanding_agent_requests();
levent_snmp_update(cfg);
}
#endif
} while (event_base_loop(cfg->g_base, EVLOOP_ONCE) == 0);
#ifdef USE_SNMP
if (cfg->g_snmp)
agent_shutdown();
#endif /* USE_SNMP */
}
static lagopus_result_t
internal_snmpmgr_poll(lagopus_chrono_t nsec) {
int numfds = 0;
fd_set fdset;
struct timespec timeout = { 0, 0 };
struct timeval timeout_dummy;
int count = 0;
int block = true;
lagopus_result_t ret = LAGOPUS_RESULT_ANY_FAILURES;
NSEC_TO_TS(nsec, timeout);
FD_ZERO(&fdset);
if (snmp_select_info(&numfds, &fdset, &timeout_dummy, &block) > 0) {
if ((count = pselect(numfds, &fdset, NULL, NULL, &timeout, NULL)) > 0) {
snmp_read(&fdset);
} else {
if (count == 0) {
snmp_timeout();
} else {
perror("pselect");
return LAGOPUS_RESULT_POSIX_API_ERROR;
}
}
/* run callbacks includes that checking connetion to AgetnX master agent */
run_alarms();
netsnmp_check_outstanding_agent_requests();
if (count == 0) {
ret = LAGOPUS_RESULT_TIMEDOUT;
} else {
ret = LAGOPUS_RESULT_OK;
}
} else { /* snmp_select_info */
ret = LAGOPUS_RESULT_SNMP_API_ERROR;
}
return ret;
}
/*******************************************************************-o-******
* receive
*
* Parameters:
*
* Returns:
* 0 On success.
* -1 System error.
*
* Infinite while-loop which monitors incoming messages for the agent.
* Invoke the established message handlers for incoming messages on a per
* port basis. Handle timeouts.
*/
static int
receive(void)
{
int numfds;
netsnmp_large_fd_set readfds, writefds, exceptfds;
struct timeval timeout, *tvp = &timeout;
int count, block, i;
#ifdef USING_SMUX_MODULE
int sd;
#endif /* USING_SMUX_MODULE */
netsnmp_large_fd_set_init(&readfds, FD_SETSIZE);
netsnmp_large_fd_set_init(&writefds, FD_SETSIZE);
netsnmp_large_fd_set_init(&exceptfds, FD_SETSIZE);
/*
* ignore early sighup during startup
*/
reconfig = 0;
#if defined(WIN32)
create_stdin_waiter_thread();
#endif
/*
* Loop-forever: execute message handlers for sockets with data
*/
while (netsnmp_running) {
if (reconfig) {
#if HAVE_SIGHOLD
sighold(SIGHUP);
#endif
reconfig = 0;
snmp_log(LOG_INFO, "Reconfiguring daemon\n");
/* Stop and restart logging. This allows logfiles to be
rotated etc. */
netsnmp_logging_restart();
snmp_log(LOG_INFO, "NET-SNMP version %s restarted\n",
netsnmp_get_version());
update_config();
send_easy_trap(SNMP_TRAP_ENTERPRISESPECIFIC, 3);
#if HAVE_SIGHOLD
sigrelse(SIGHUP);
#endif
}
/*
* default to sleeping for a really long time. INT_MAX
* should be sufficient (eg we don't care if time_t is
* a long that's bigger than an int).
*/
tvp = &timeout;
tvp->tv_sec = INT_MAX;
tvp->tv_usec = 0;
numfds = 0;
NETSNMP_LARGE_FD_ZERO(&readfds);
NETSNMP_LARGE_FD_ZERO(&writefds);
NETSNMP_LARGE_FD_ZERO(&exceptfds);
block = 0;
snmp_select_info2(&numfds, &readfds, tvp, &block);
if (block == 1) {
tvp = NULL; /* block without timeout */
}
#ifdef USING_SMUX_MODULE
if (smux_listen_sd >= 0) {
NETSNMP_LARGE_FD_SET(smux_listen_sd, &readfds);
numfds =
smux_listen_sd >= numfds ? smux_listen_sd + 1 : numfds;
for (i = 0; i < smux_snmp_select_list_get_length(); i++) {
sd = smux_snmp_select_list_get_SD_from_List(i);
if (sd != 0)
{
NETSNMP_LARGE_FD_SET(sd, &readfds);
numfds = sd >= numfds ? sd + 1 : numfds;
}
}
}
#endif /* USING_SMUX_MODULE */
#ifndef NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER
netsnmp_external_event_info2(&numfds, &readfds, &writefds, &exceptfds);
#endif /* NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER */
reselect:
for (i = 0; i < NUM_EXTERNAL_SIGS; i++) {
if (external_signal_scheduled[i]) {
external_signal_scheduled[i]--;
external_signal_handler[i](i);
}
}
DEBUGMSGTL(("snmpd/select", "select( numfds=%d, ..., tvp=%p)\n",
numfds, tvp));
if (tvp)
DEBUGMSGTL(("timer", "tvp %ld.%ld\n", (long) tvp->tv_sec,
(long) tvp->tv_usec));
count = netsnmp_large_fd_set_select(numfds, &readfds, &writefds, &exceptfds,
tvp);
DEBUGMSGTL(("snmpd/select", "returned, count = %d\n", count));
if (count > 0) {
#ifdef USING_SMUX_MODULE
/*
* handle the SMUX sd's
*/
if (smux_listen_sd >= 0) {
for (i = 0; i < smux_snmp_select_list_get_length(); i++) {
sd = smux_snmp_select_list_get_SD_from_List(i);
if (NETSNMP_LARGE_FD_ISSET(sd, &readfds)) {
if (smux_process(sd) < 0) {
smux_snmp_select_list_del(sd);
}
}
}
/*
* new connection
*/
if (NETSNMP_LARGE_FD_ISSET(smux_listen_sd, &readfds)) {
if ((sd = smux_accept(smux_listen_sd)) >= 0) {
smux_snmp_select_list_add(sd);
}
}
}
#endif /* USING_SMUX_MODULE */
#ifndef NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER
netsnmp_dispatch_external_events2(&count, &readfds,
&writefds, &exceptfds);
#endif /* NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER */
/* If there are still events leftover, process them */
if (count > 0) {
snmp_read2(&readfds);
}
} else
switch (count) {
case 0:
snmp_timeout();
break;
case -1:
DEBUGMSGTL(("snmpd/select", " errno = %d\n", errno));
if (errno == EINTR) {
/*
* likely that we got a signal. Check our special signal
* flags before retrying select.
*/
if (netsnmp_running && !reconfig) {
goto reselect;
}
continue;
} else {
snmp_log_perror("select");
}
return -1;
default:
snmp_log(LOG_ERR, "select returned %d\n", count);
return -1;
} /* endif -- count>0 */
/*
* see if persistent store needs to be saved
*/
snmp_store_if_needed();
/*
* run requested alarms
*/
run_alarms();
netsnmp_check_outstanding_agent_requests();
} /* endwhile */
netsnmp_large_fd_set_cleanup(&readfds);
netsnmp_large_fd_set_cleanup(&writefds);
netsnmp_large_fd_set_cleanup(&exceptfds);
#if defined(WIN32)
join_stdin_waiter_thread();
#endif
snmp_log(LOG_INFO, "Received TERM or STOP signal... shutting down...\n");
return 0;
} /* end receive() */
/*Check if data has been received*/
int
netSelect(TimeInternal * timeout, NetPath * netPath, fd_set *readfds)
{
int ret, nfds;
struct timeval tv, *tv_ptr;
#if defined PTPD_SNMP
extern RunTimeOpts rtOpts;
struct timeval snmp_timer_wait = { 0, 0}; // initialise to avoid unused warnings when SNMP disabled
int snmpblock = 0;
#endif
if (timeout) {
if(isTimeInternalNegative(timeout)) {
ERROR("Negative timeout attempted for select()\n");
return -1;
}
tv.tv_sec = timeout->seconds;
tv.tv_usec = timeout->nanoseconds / 1000;
tv_ptr = &tv;
} else {
tv_ptr = NULL;
}
FD_ZERO(readfds);
nfds = 0;
#ifdef PTPD_PCAP
if (netPath->pcapEventSock >= 0) {
FD_SET(netPath->pcapEventSock, readfds);
if (netPath->pcapGeneralSock >= 0)
FD_SET(netPath->pcapGeneralSock, readfds);
nfds = netPath->pcapEventSock;
if (netPath->pcapEventSock < netPath->pcapGeneralSock)
nfds = netPath->pcapGeneralSock;
} else if (netPath->eventSock >= 0) {
#endif
FD_SET(netPath->eventSock, readfds);
if (netPath->generalSock >= 0)
FD_SET(netPath->generalSock, readfds);
nfds = netPath->eventSock;
if (netPath->eventSock < netPath->generalSock)
nfds = netPath->generalSock;
#ifdef PTPD_PCAP
}
#endif
nfds++;
#if defined PTPD_SNMP
if (rtOpts.snmp_enabled) {
snmpblock = 1;
if (tv_ptr) {
snmpblock = 0;
memcpy(&snmp_timer_wait, tv_ptr, sizeof(struct timeval));
}
snmp_select_info(&nfds, readfds, &snmp_timer_wait, &snmpblock);
if (snmpblock == 0)
tv_ptr = &snmp_timer_wait;
}
#endif
ret = select(nfds, readfds, 0, 0, tv_ptr);
if (ret < 0) {
if (errno == EAGAIN || errno == EINTR)
return 0;
}
#if defined PTPD_SNMP
if (rtOpts.snmp_enabled) {
/* Maybe we have received SNMP related data */
if (ret > 0) {
snmp_read(readfds);
} else if (ret == 0) {
snmp_timeout();
run_alarms();
}
netsnmp_check_outstanding_agent_requests();
}
#endif
return ret;
}
/*******************************************************************-o-******
* receive
*
* Parameters:
*
* Returns:
* 0 On success.
* -1 System error.
*
* Infinite while-loop which monitors incoming messages for the agent.
* Invoke the established message handlers for incoming messages on a per
* port basis. Handle timeouts.
*/
static int
receive(void)
{
int numfds;
netsnmp_large_fd_set readfds, writefds, exceptfds;
struct timeval timeout, *tvp = &timeout;
int count, block, i;
netsnmp_large_fd_set_init(&readfds, FD_SETSIZE);
netsnmp_large_fd_set_init(&writefds, FD_SETSIZE);
netsnmp_large_fd_set_init(&exceptfds, FD_SETSIZE);
/*
* you're main loop here...
*/
while (ams_running) {
/* following code from snmpd */
/*
* if you use select(), see snmp_select_info() in snmp_api(3)
*/
/*
* default to sleeping for a really long time. INT_MAX
* should be sufficient (eg we don't care if time_t is
* a long that's bigger than an int).
*/
tvp = &timeout;
tvp->tv_sec = INT_MAX;
tvp->tv_usec = 0;
numfds = 0;
NETSNMP_LARGE_FD_ZERO(&readfds);
NETSNMP_LARGE_FD_ZERO(&writefds);
NETSNMP_LARGE_FD_ZERO(&exceptfds);
block = 0;
snmp_sess_select_info2_flags(0, &numfds, &readfds, tvp, &block,
NETSNMP_SELECT_NOFLAGS);
if (block == 1) {
tvp = NULL; /* block without timeout */
}
netsnmp_external_event_info2(&numfds, &readfds, &writefds, &exceptfds);
reselect:
for (i = 0; i < NUM_EXTERNAL_SIGS; i++) {
if (external_signal_scheduled[i]) {
external_signal_scheduled[i]--;
external_signal_handler[i](i);
}
}
DEBUGMSGTL(("snmpd/select", "select( numfds=%d, ..., tvp=%p)\n",
numfds, tvp));
if (tvp)
DEBUGMSGTL(("timer", "tvp %ld.%ld\n", (long) tvp->tv_sec,
(long) tvp->tv_usec));
count = netsnmp_large_fd_set_select(numfds, &readfds, &writefds, &exceptfds,
tvp);
DEBUGMSGTL(("snmpd/select", "returned, count = %d\n", count));
if (count > 0) {
netsnmp_dispatch_external_events2(&count, &readfds,
&writefds, &exceptfds);
/* If there are still events leftover, process them */
if (count > 0) {
snmp_read2(&readfds);
}
} else
switch (count) {
case 0:
snmp_timeout();
break;
case -1:
DEBUGMSGTL(("snmpd/select", " errno = %d\n", errno));
if (errno == EINTR) {
/*
* likely that we got a signal. Check our special signal
* flags before retrying select.
*/
if (ams_running) {
goto reselect;
}
continue;
} else {
snmp_log_perror("select");
}
return -1;
default:
snmp_log(LOG_ERR, "select returned %d\n", count);
return -1;
} /* endif -- count>0 */
/*
* run requested alarms
*/
run_alarms();
netsnmp_check_outstanding_agent_requests();
}
/* lets give a seconb or 2 to log the shutdown */
sleep(0);
netsnmp_large_fd_set_cleanup(&readfds);
netsnmp_large_fd_set_cleanup(&writefds);
netsnmp_large_fd_set_cleanup(&exceptfds);
/*
* at shutdown time
*/
snmp_log(LOG_INFO, "Received TERM or STOP signal... shutting down...\n");
return 0;
} /* end receive() */
/*******************************************************************-o-******
* receive
*
* Parameters:
*
* Returns:
* 0 On success.
* -1 System error.
*
* Infinite while-loop which monitors incoming messges for the agent.
* Invoke the established message handlers for incoming messages on a per
* port basis. Handle timeouts.
*/
static int
receive(void)
{
int numfds;
fd_set readfds, writefds, exceptfds;
struct timeval timeout, *tvp = &timeout;
struct timeval sched, *svp = &sched, now, *nvp = &now;
int count, block, i;
#ifdef USING_SMUX_MODULE
int sd;
#endif /* USING_SMUX_MODULE */
/*
* Set the 'sched'uled timeout to the current time + one TIMETICK.
*/
gettimeofday(nvp, (struct timezone *) NULL);
svp->tv_usec = nvp->tv_usec + TIMETICK;
svp->tv_sec = nvp->tv_sec;
while (svp->tv_usec >= ONE_SEC) {
svp->tv_usec -= ONE_SEC;
svp->tv_sec++;
}
/*
* ignore early sighup during startup
*/
reconfig = 0;
/*
* Loop-forever: execute message handlers for sockets with data,
* reset the 'sched'uler.
*/
while (netsnmp_running) {
if (reconfig) {
reconfig = 0;
snmp_log(LOG_INFO, "Reconfiguring daemon\n");
/* Stop and restart logging. This allows logfiles to be
rotated etc. */
snmp_disable_log();
setup_log(1, 0, 0, 0, NULL);
snmp_log(LOG_INFO, "NET-SNMP version %s restarted\n",
netsnmp_get_version());
update_config();
send_easy_trap(SNMP_TRAP_ENTERPRISESPECIFIC, 3);
}
for (i = 0; i < NUM_EXTERNAL_SIGS; i++) {
if (external_signal_scheduled[i]) {
external_signal_scheduled[i]--;
external_signal_handler[i](i);
}
}
tvp = &timeout;
tvp->tv_sec = 0;
tvp->tv_usec = TIMETICK;
numfds = 0;
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_ZERO(&exceptfds);
block = 0;
snmp_select_info(&numfds, &readfds, tvp, &block);
if (block == 1) {
tvp = NULL; /* block without timeout */
}
#ifdef USING_SMUX_MODULE
if (smux_listen_sd >= 0) {
FD_SET(smux_listen_sd, &readfds);
numfds =
smux_listen_sd >= numfds ? smux_listen_sd + 1 : numfds;
for (i = 0; i < sdlen; i++) {
FD_SET(sdlist[i], &readfds);
numfds = sdlist[i] >= numfds ? sdlist[i] + 1 : numfds;
}
}
#endif /* USING_SMUX_MODULE */
for (i = 0; i < external_readfdlen; i++) {
FD_SET(external_readfd[i], &readfds);
if (external_readfd[i] >= numfds)
numfds = external_readfd[i] + 1;
}
for (i = 0; i < external_writefdlen; i++) {
FD_SET(external_writefd[i], &writefds);
if (external_writefd[i] >= numfds)
numfds = external_writefd[i] + 1;
}
for (i = 0; i < external_exceptfdlen; i++) {
FD_SET(external_exceptfd[i], &exceptfds);
if (external_exceptfd[i] >= numfds)
numfds = external_exceptfd[i] + 1;
}
reselect:
DEBUGMSGTL(("snmpd/select", "select( numfds=%d, ..., tvp=%p)\n",
numfds, tvp));
count = select(numfds, &readfds, &writefds, &exceptfds, tvp);
DEBUGMSGTL(("snmpd/select", "returned, count = %d\n", count));
if (count > 0) {
#ifdef USING_SMUX_MODULE
/*
* handle the SMUX sd's
*/
if (smux_listen_sd >= 0) {
for (i = 0; i < sdlen; i++) {
if (FD_ISSET(sdlist[i], &readfds)) {
if (smux_process(sdlist[i]) < 0) {
for (; i < (sdlen - 1); i++) {
sdlist[i] = sdlist[i + 1];
}
sdlen--;
}
}
}
/*
* new connection
*/
if (FD_ISSET(smux_listen_sd, &readfds)) {
if ((sd = smux_accept(smux_listen_sd)) >= 0) {
sdlist[sdlen++] = sd;
}
}
}
#endif /* USING_SMUX_MODULE */
snmp_read(&readfds);
for (i = 0; count && (i < external_readfdlen); i++) {
if (FD_ISSET(external_readfd[i], &readfds)) {
DEBUGMSGTL(("snmpd/select", "readfd[%d] = %d\n",
i, external_readfd[i]));
external_readfdfunc[i] (external_readfd[i],
external_readfd_data[i]);
FD_CLR(external_readfd[i], &readfds);
count--;
}
}
for (i = 0; count && (i < external_writefdlen); i++) {
if (FD_ISSET(external_writefd[i], &writefds)) {
DEBUGMSGTL(("snmpd/select", "writefd[%d] = %d\n",
i, external_writefd[i]));
external_writefdfunc[i] (external_writefd[i],
external_writefd_data[i]);
FD_CLR(external_writefd[i], &writefds);
count--;
}
}
for (i = 0; count && (i < external_exceptfdlen); i++) {
if (FD_ISSET(external_exceptfd[i], &exceptfds)) {
DEBUGMSGTL(("snmpd/select", "exceptfd[%d] = %d\n",
i, external_exceptfd[i]));
external_exceptfdfunc[i] (external_exceptfd[i],
external_exceptfd_data[i]);
FD_CLR(external_exceptfd[i], &exceptfds);
count--;
}
}
} else
switch (count) {
case 0:
snmp_timeout();
break;
case -1:
if (errno == EINTR) {
/*
* likely that we got a signal. Check our special signal
* flags before retrying select.
*/
if (netsnmp_running && !reconfig) {
goto reselect;
}
continue;
} else {
snmp_log_perror("select");
}
return -1;
default:
snmp_log(LOG_ERR, "select returned %d\n", count);
return -1;
} /* endif -- count>0 */
/*
* If the time 'now' is greater than the 'sched'uled time, then:
*
* Check alarm and event timers.
* Reset the 'sched'uled time to current time + one TIMETICK.
* Age the cache network addresses (from whom messges have
* been received).
*/
gettimeofday(nvp, (struct timezone *)NULL);
if (nvp->tv_sec > svp->tv_sec || (nvp->tv_sec == svp->tv_sec &&
nvp->tv_usec > svp->tv_usec)) {
svp->tv_usec = nvp->tv_usec + TIMETICK;
svp->tv_sec = nvp->tv_sec;
while (svp->tv_usec >= ONE_SEC) {
svp->tv_usec -= ONE_SEC;
svp->tv_sec++;
}
}
/*
* endif -- now>sched
*/
/*
* run requested alarms
*/
run_alarms();
netsnmp_check_outstanding_agent_requests();
} /* endwhile */
snmp_log(LOG_INFO, "Received TERM or STOP signal... shutting down...\n");
return 0;
} /* end receive() */