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Diffstat (limited to 'agent/main.cpp')
| -rw-r--r-- | agent/main.cpp | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/agent/main.cpp b/agent/main.cpp new file mode 100644 index 0000000..033696e --- /dev/null +++ b/agent/main.cpp @@ -0,0 +1,180 @@ +/** + * @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; +} |