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/**
* @brief SNMP Agent entry point
*
* This file is part of sila-snmp project.
*
* Copyright (c) 2022 SILA
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "config.h"
#include "tracing.hpp"
#include "sdbusplus/helper.hpp"
#include "snmp.hpp"
#include <sdeventplus/event.hpp>
#include <sdeventplus/source/signal.hpp>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <csignal>
#include "sila/powerstate.hpp"
#include "sila/sensors.hpp"
#include "sila/software.hpp"
#include "sila/inventory.hpp"
void print_usage()
{
fprintf(stderr, "Usage: %s [OPTIONS]\n\n", PACKAGE_NAME);
fprintf(stderr, " Version: %s\n\nOPTIONS:\n", PACKAGE_VERSION);
fprintf(stderr, " -h,--help\t\tdisplay this help message\n");
fprintf(stderr, " -d\t\t\tdump sent and received SNMP packets\n");
fprintf(
stderr,
" -D[TOKEN[,...]]\tturn on debugging output for the given TOKEN(s)\n"
"\t\t\t (try ALL for extremely verbose output)\n");
fprintf(stderr,
" -L <LOGOPTS>\t\ttoggle options controlling where to log to\n");
snmp_log_options_usage("\t\t\t ", stderr);
fflush(stderr);
}
// parse_args error codes
enum
{
EC_SHOW_USAGE = 1,
EC_ERROR = -1,
EC_SUCCESS = 0,
};
int parse_args(int argc, char** argv)
{
constexpr auto Opts = "dD:L:h";
optind = 1;
int arg;
int rc = EC_SUCCESS;
while (EC_SUCCESS == rc && (arg = getopt(argc, argv, Opts)) != EOF)
{
DEBUGMSGTL(("parse_args", "handling (#%d): %c\n", optind, arg));
switch (arg)
{
case 'D':
debug_register_tokens(optarg);
snmp_set_do_debugging(1);
break;
case 'd':
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DUMP_PACKET, 1);
break;
case 'L':
rc = snmp_log_options(optarg, argc, argv);
break;
case 'h':
rc = EC_SHOW_USAGE;
break;
case '?':
default:
rc = EC_ERROR;
break;
}
}
DEBUGMSGTL(("parse_args", "finished: %d/%d\n", optind, argc));
return rc;
}
static void clean_exit(sdeventplus::source::Signal& source,
const struct signalfd_siginfo*)
{
TRACE_INFO("Signal %d received, terminating...\n", source.get_signal());
source.get_event().exit(EXIT_SUCCESS);
}
int main(int argc, char* argv[])
{
int rc = parse_args(argc, argv);
if (rc < EC_SUCCESS)
{
return EXIT_FAILURE;
}
else if (rc > EC_SUCCESS)
{
print_usage();
return EXIT_SUCCESS;
}
auto evt = sdeventplus::Event::get_default();
sdbusplus::helper::helper::getBus().attach_event(evt.get(),
SD_EVENT_PRIORITY_NORMAL);
sigset_t ss;
if (sigemptyset(&ss) < 0 || sigaddset(&ss, SIGTERM) < 0 ||
sigaddset(&ss, SIGINT) < 0)
{
TRACE_ERROR("Failed to setup signal hanlders.\n");
return EXIT_FAILURE;
}
/* Block SIGTERM first, so than the event loop can handle it */
if (sigprocmask(SIG_BLOCK, &ss, NULL) < 0)
{
TRACE_ERROR("Failed to block SIGTERM.\n");
return EXIT_FAILURE;
}
sdeventplus::source::Signal sigterm(evt, SIGTERM, clean_exit);
sdeventplus::source::Signal sigint(evt, SIGINT, clean_exit);
snmpagent_init(evt);
// Initialize DBus and MIB objects
sila::host::power::state::init();
sila::sensors::init();
sila::software::init();
sila::inventory::init();
// main loop
TRACE_INFO("%s is up and running.\n", PACKAGE_STRING);
rc = evt.loop();
TRACE_INFO("%s shuting down.\n", PACKAGE_STRING);
// Release DBus and MIB objects resources
sila::inventory::destroy();
sila::software::destroy();
sila::sensors::destroy();
sila::host::power::state::destroy();
snmpagent_destroy();
if (rc < 0)
{
TRACE_ERROR("Event loop returned error %d, %s\n", rc, strerror(-rc));
return -rc;
}
return EXIT_SUCCESS;
}
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