示例#1
0
/*******************************************************************-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;
    int             count, block, i;
#ifdef	USING_SMUX_MODULE
    int             sd;
#endif                          /* USING_SMUX_MODULE */

    /*
     * 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
        }

        for (i = 0; i < NUM_EXTERNAL_SIGS; i++) {
            if (external_signal_scheduled[i]) {
                external_signal_scheduled[i]--;
                external_signal_handler[i](i);
            }
        }

        /*
         * 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;
        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 < smux_snmp_select_list_get_length(); i++) {
                sd = smux_snmp_select_list_get_SD_from_List(i);
                if (sd != 0)
                {
                   FD_SET(sd, &readfds);
                   numfds = sd >= numfds ? sd + 1 : numfds;
                }
            }
        }
#endif                          /* USING_SMUX_MODULE */

        netsnmp_external_event_info(&numfds, &readfds, &writefds, &exceptfds);

    reselect:
        DEBUGMSGTL(("snmpd/select", "select( numfds=%d, ..., tvp=%p)\n",
                    numfds, tvp));
        if(tvp)
            DEBUGMSGTL(("timer", "tvp %d.%d\n", tvp->tv_sec, tvp->tv_usec));
        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 < smux_snmp_select_list_get_length(); i++) {
                    sd = smux_snmp_select_list_get_SD_from_List(i);
                    if (FD_ISSET(sd, &readfds)) {
                        if (smux_process(sd) < 0) {
                            smux_snmp_select_list_del(sd);
                        }
                    }
                }
                /*
                 * new connection 
                 */
                if (FD_ISSET(smux_listen_sd, &readfds)) {
                    if ((sd = smux_accept(smux_listen_sd)) >= 0) {
                        smux_snmp_select_list_add(sd);
                    }
                }
            }

#endif                          /* USING_SMUX_MODULE */
            netsnmp_dispatch_external_events(&count, &readfds,
                                           &writefds, &exceptfds);
            /* If there are still events leftover, process them */
            if (count > 0) {
              snmp_read(&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 */

        /*
         * run requested alarms 
         */
        run_alarms();

        netsnmp_check_outstanding_agent_requests();

    }                           /* endwhile */

#if defined(WIN32)
    join_stdin_waiter_thread();
#endif

    snmp_log(LOG_INFO, "Received TERM or STOP signal...  shutting down...\n");
    return 0;

}                               /* end receive() */
示例#2
0
static void
snmptrapd_main_loop(void)
{
    int             count, numfds, block;
    fd_set          readfds,writefds,exceptfds;
    struct timeval  timeout, *tvp;

    while (netsnmp_running) {
        if (reconfig) {
                /*
                 * If we are logging to a file, receipt of SIGHUP also
                 * indicates that the log file should be closed and
                 * re-opened.  This is useful for users that want to
                 * rotate logs in a more predictable manner.
                 */
                netsnmp_logging_restart();
                snmp_log(LOG_INFO, "NET-SNMP version %s restarted\n",
                         netsnmp_get_version());
            trapd_update_config();
            if (trap1_fmt_str_remember) {
                parse_format( NULL, trap1_fmt_str_remember );
            }
            reconfig = 0;
        }
        numfds = 0;
        FD_ZERO(&readfds);
        FD_ZERO(&writefds);
        FD_ZERO(&exceptfds);
        block = 0;
        tvp = &timeout;
        timerclear(tvp);
        tvp->tv_sec = 5;
        snmp_select_info(&numfds, &readfds, tvp, &block);
        if (block == 1)
            tvp = NULL;         /* block without timeout */
#ifndef NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER
        netsnmp_external_event_info(&numfds, &readfds, &writefds, &exceptfds);
#endif /* NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER */
        count = select(numfds, &readfds, &writefds, &exceptfds, tvp);
        if (count > 0) {
#ifndef NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER
            netsnmp_dispatch_external_events(&count, &readfds, &writefds,
                                             &exceptfds);
#endif /* NETSNMP_FEATURE_REMOVE_FD_EVENT_MANAGER */
            /* If there are any more events after external events, then
             * try SNMP events. */
            if (count > 0) {
                snmp_read(&readfds);
            }
        } else {
            switch (count) {
            case 0:
                snmp_timeout();
                break;
            case -1:
                if (errno == EINTR)
                    continue;
                snmp_log_perror("select");
                netsnmp_running = 0;
                break;
            default:
                fprintf(stderr, "select returned %d\n", count);
                netsnmp_running = 0;
            }
	}
	run_alarms();
    }
}
示例#3
0
main(int argc, char *argv[])
#endif
{
    char            options[128] = "aAc:CdD::efF:g:hHI:L:m:M:no:O:PqsS:tu:vx:-:";
    netsnmp_session *sess_list = NULL, *ss = NULL;
    netsnmp_transport *transport = NULL;
    int             arg, i = 0, depmsg = 0;
    int             uid = 0, gid = 0;
    int             count, numfds, block;
    fd_set          readfds,writefds,exceptfds;
    struct timeval  timeout, *tvp;
    char           *cp, *listen_ports = NULL;
#if defined(USING_AGENTX_SUBAGENT_MODULE) && !defined(NETSNMP_SNMPTRAPD_DISABLE_AGENTX)
    int             agentx_subagent = 1;
#endif
    netsnmp_trapd_handler *traph;
#ifdef NETSNMP_EMBEDDED_PERL
    extern void init_perl(void);
#endif

#ifndef WIN32
    /*
     * close all non-standard file descriptors we may have
     * inherited from the shell.
     */
    for (i = getdtablesize() - 1; i > 2; --i) {
        (void) close(i);
    }
#endif /* #WIN32 */
    
#ifdef SIGTERM
    signal(SIGTERM, term_handler);
#endif
#ifdef SIGHUP
    signal(SIGHUP, SIG_IGN);   /* do not terminate on early SIGHUP */
#endif
#ifdef SIGINT
    signal(SIGINT, term_handler);
#endif
#ifdef SIGPIPE
    signal(SIGPIPE, SIG_IGN);   /* 'Inline' failure of wayward readers */
#endif

#ifdef SIGHUP
    signal(SIGHUP, SIG_IGN);   /* do not terminate on early SIGHUP */
#endif

    /*
     * register our configuration handlers now so -H properly displays them 
     */
    snmptrapd_register_configs( );
    init_usm_conf( "snmptrapd" );
    register_config_handler("snmptrapd", "snmpTrapdAddr",
                            parse_trapd_address, free_trapd_address, "string");

    register_config_handler("snmptrapd", "doNotLogTraps",
                            parse_config_doNotLogTraps, NULL, "(1|yes|true|0|no|false)");
#if HAVE_GETPID
    register_config_handler("snmptrapd", "pidFile",
                            parse_config_pidFile, NULL, "string");
#endif
#ifdef HAVE_UNISTD_H
    register_config_handler("snmptrapd", "agentuser",
                            parse_config_agentuser, NULL, "userid");
    register_config_handler("snmptrapd", "agentgroup",
                            parse_config_agentgroup, NULL, "groupid");
#endif
    
    register_config_handler("snmptrapd", "logOption",
                            parse_config_logOption, NULL, "string");

    register_config_handler("snmptrapd", "doNotFork",
                            parse_config_doNotFork, NULL, "(1|yes|true|0|no|false)");

    register_config_handler("snmptrapd", "printEventNumbers",
                            parse_config_printEventNumbers, NULL, "(1|yes|true|0|no|false)");

    register_config_handler("snmptrapd", "ignoreAuthFailure",
                            parse_config_ignoreAuthFailure, NULL, "(1|yes|true|0|no|false)");

    register_config_handler("snmptrapd", "outputOption",
                            parse_config_outputOption, NULL, "string");

#ifdef WIN32
    setvbuf(stdout, NULL, _IONBF, BUFSIZ);
#else
    setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
#endif

    /*
     * Add some options if they are available.  
     */
#if HAVE_GETPID
    strcat(options, "p:");
#endif

#ifdef WIN32
    snmp_log_syslogname(app_name_long);
#else
    snmp_log_syslogname(app_name);
#endif

    /*
     * Now process options normally.  
     */

    while ((arg = getopt(argc, argv, options)) != EOF) {
        switch (arg) {
        case '-':
            if (strcasecmp(optarg, "help") == 0) {
                usage();
                exit(0);
            }
            if (strcasecmp(optarg, "version") == 0) {
                version();
                exit(0);
            }

            handle_long_opt(optarg);
            break;

        case 'a':
            dropauth = 1;
            break;

        case 'A':
            netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
                                   NETSNMP_DS_LIB_APPEND_LOGFILES, 1);
            break;

        case 'c':
            if (optarg != NULL) {
                netsnmp_ds_set_string(NETSNMP_DS_LIBRARY_ID, 
				      NETSNMP_DS_LIB_OPTIONALCONFIG, optarg);
            } else {
                usage();
                exit(1);
            }
            break;

        case 'C':
            netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, 
				   NETSNMP_DS_LIB_DONT_READ_CONFIGS, 1);
            break;

        case 'd':
            snmp_set_dump_packet(1);
            break;

        case 'D':
            debug_register_tokens(optarg);
            snmp_set_do_debugging(1);
            break;

        case 'e':
            Event++;
            break;

        case 'f':
            dofork = 0;
            break;

        case 'F':
            if (optarg != NULL) {
                trap1_fmt_str_remember = optarg;
            } else {
                usage();
                exit(1);
            }
            break;

#if HAVE_UNISTD_H
        case 'g':
            if (optarg != NULL) {
                netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID, 
				   NETSNMP_DS_AGENT_GROUPID, gid = atoi(optarg));
            } else {
                usage();
                exit(1);
            }
            break;
#endif

        case 'h':
            usage();
            exit(0);

        case 'H':
            init_agent("snmptrapd");
#ifdef USING_NOTIFICATION_LOG_MIB_NOTIFICATION_LOG_MODULE
            init_notification_log();
#endif
#ifdef NETSNMP_EMBEDDED_PERL
            init_perl();
#endif
            init_snmp("snmptrapd");
            fprintf(stderr, "Configuration directives understood:\n");
            read_config_print_usage("  ");
            exit(0);

        case 'I':
            if (optarg != NULL) {
                add_to_init_list(optarg);
            } else {
                usage();
            }
            break;

	case 'S':
            fprintf(stderr,
                    "Warning: -S option is deprecated; use -Ls <facility> instead\n");
            depmsg = 1;
            if (optarg != NULL) {
                switch (*optarg) {
                case 'd':
                case 'D':
                    Facility = LOG_DAEMON;
                    break;
                case 'i':
                case 'I':
                    Facility = LOG_INFO;
                    break;
                case '0':
                    Facility = LOG_LOCAL0;
                    break;
                case '1':
                    Facility = LOG_LOCAL1;
                    break;
                case '2':
                    Facility = LOG_LOCAL2;
                    break;
                case '3':
                    Facility = LOG_LOCAL3;
                    break;
                case '4':
                    Facility = LOG_LOCAL4;
                    break;
                case '5':
                    Facility = LOG_LOCAL5;
                    break;
                case '6':
                    Facility = LOG_LOCAL6;
                    break;
                case '7':
                    Facility = LOG_LOCAL7;
                    break;
                default:
                    fprintf(stderr, "invalid syslog facility: -S%c\n",*optarg);
                    usage();
                    exit(1);
                }
            } else {
                fprintf(stderr, "no syslog facility specified\n");
                usage();
                exit(1);
            }
            break;

        case 'm':
            if (optarg != NULL) {
                setenv("MIBS", optarg, 1);
            } else {
                usage();
                exit(1);
            }
            break;

        case 'M':
            if (optarg != NULL) {
                setenv("MIBDIRS", optarg, 1);
            } else {
                usage();
                exit(1);
            }
            break;

        case 'n':
            netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, 
				   NETSNMP_DS_APP_NUMERIC_IP, 1);
            break;

        case 'o':
            fprintf(stderr,
                    "Warning: -o option is deprecated; use -Lf <file> instead\n");
            if (optarg != NULL) {
                logfile = optarg;
                snmp_enable_filelog(optarg, 
                                    netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID,
                                                           NETSNMP_DS_LIB_APPEND_LOGFILES));
            } else {
                usage();
                exit(1);
            }
            break;

        case 'O':
            cp = snmp_out_toggle_options(optarg);
            if (cp != NULL) {
                fprintf(stderr, "Unknown output option passed to -O: %c\n",
			*cp);
                usage();
                exit(1);
            }
            break;

        case 'L':
	    if  (snmp_log_options( optarg, argc, argv ) < 0 ) {
                usage();
                exit(1);
            }
            break;

#if HAVE_GETPID
        case 'p':
            if (optarg != NULL) {
                parse_config_pidFile(NULL, optarg);
            } else {
                usage();
                exit(1);
            }
            break;
#endif

        case 'P':
            fprintf(stderr,
                    "Warning: -P option is deprecated; use -f -Le instead\n");
            dofork = 0;
            snmp_enable_stderrlog();
            break;

        case 's':
            fprintf(stderr,
                    "Warning: -s option is deprecated; use -Lsd instead\n");
            depmsg = 1;
#ifdef WIN32
            snmp_enable_syslog_ident(app_name_long, Facility);
#else
            snmp_enable_syslog_ident(app_name, Facility);
#endif
            break;

        case 't':
            SyslogTrap++;
            break;

#if HAVE_UNISTD_H
        case 'u':
            if (optarg != NULL) {
                char           *ecp;

                uid = strtoul(optarg, &ecp, 10);
                if (*ecp) {
#if HAVE_GETPWNAM && HAVE_PWD_H
                    struct passwd  *info;
                    info = getpwnam(optarg);
                    if (info) {
                        uid = info->pw_uid;
                    } else {
#endif
                        fprintf(stderr, "Bad user id: %s\n", optarg);
                        exit(1);
#if HAVE_GETPWNAM && HAVE_PWD_H
                    }
#endif
                }
                netsnmp_ds_set_int(NETSNMP_DS_APPLICATION_ID, 
				   NETSNMP_DS_AGENT_USERID, uid);
            } else {
                usage();
                exit(1);
            }
            break;
#endif

        case 'v':
            version();
            exit(0);
            break;

        case 'x':
            if (optarg != NULL) {
                netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
                                      NETSNMP_DS_AGENT_X_SOCKET, optarg);
            } else {
                usage();
                exit(1);
            }
            break;

        default:
            fprintf(stderr, "invalid option: -%c\n", arg);
            usage();
            exit(1);
            break;
        }
    }

    if (optind < argc) {
        /*
         * There are optional transport addresses on the command line.  
         */
        for (i = optind; i < argc; i++) {
            char *astring;
            if (listen_ports != NULL) {
                astring = malloc(strlen(listen_ports) + 2 + strlen(argv[i]));
                if (astring == NULL) {
                    fprintf(stderr, "malloc failure processing argv[%d]\n", i);
                    exit(1);
                }
                sprintf(astring, "%s,%s", listen_ports, argv[i]);
                free(listen_ports);
                listen_ports = astring;
            } else {
                listen_ports = strdup(argv[i]);
                if (listen_ports == NULL) {
                    fprintf(stderr, "malloc failure processing argv[%d]\n", i);
                    exit(1);
                }
            }
        }
    }

    SOCK_STARTUP;

    /*
     * I'm being lazy here, and not checking the
     * return value from these registration calls.
     * Don't try this at home, children!
     */
    if (0 == snmp_get_do_logging()) {
        traph = netsnmp_add_global_traphandler(NETSNMPTRAPD_PRE_HANDLER,
                                               syslog_handler);
        traph->authtypes = TRAP_AUTH_LOG;
        snmp_enable_syslog();
    } else {
        traph = netsnmp_add_global_traphandler(NETSNMPTRAPD_PRE_HANDLER,
                                               print_handler);
        traph->authtypes = TRAP_AUTH_LOG;
    }

    if (Event) {
        traph = netsnmp_add_traphandler(event_handler, risingAlarm,
                                        OID_LENGTH(risingAlarm));
        traph->authtypes = TRAP_AUTH_LOG;

        traph = netsnmp_add_traphandler(event_handler, fallingAlarm,
                                        OID_LENGTH(fallingAlarm));
        traph->authtypes = TRAP_AUTH_LOG;

        traph = netsnmp_add_traphandler(event_handler, unavailableAlarm,
                                        OID_LENGTH(unavailableAlarm));
        traph->authtypes = TRAP_AUTH_LOG;
	/* XXX - might be worth setting some "magic data"
	 * in the traphandler structure that 'event_handler'
	 * can use to avoid checking the trap OID values.
	 */
    }

#if defined(USING_AGENTX_SUBAGENT_MODULE) && !defined(NETSNMP_SNMPTRAPD_DISABLE_AGENTX)
    /*
     * we're an agentx subagent? 
     */
    if (agentx_subagent) {
        /*
         * make us a agentx client. 
         */
        netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
			       NETSNMP_DS_AGENT_ROLE, 1);
    }
#endif

    /*
     * don't fail if we can't do agentx (ie, socket not there, or not root) 
     */
    netsnmp_ds_toggle_boolean(NETSNMP_DS_APPLICATION_ID, 
			      NETSNMP_DS_AGENT_NO_ROOT_ACCESS);
    /*
     * ignore any warning messages.
     */
    netsnmp_ds_toggle_boolean(NETSNMP_DS_APPLICATION_ID, 
			      NETSNMP_DS_AGENT_NO_CONNECTION_WARNINGS);

    /*
     * initialize the agent library 
     */
    init_agent("snmptrapd");

#if defined(USING_AGENTX_SUBAGENT_MODULE) && !defined(NETSNMP_SNMPTRAPD_DISABLE_AGENTX)
    /*
     * initialize local modules 
     */
    if (agentx_subagent) {
#ifdef USING_SNMPV3_SNMPENGINE_MODULE
        extern void register_snmpEngine_scalars_context(const char *);
#endif
        subagent_init();
#ifdef USING_NOTIFICATION_LOG_MIB_NOTIFICATION_LOG_MODULE
        /* register the notification log table */
        if (should_init("notificationLogMib")) {
            netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
                              NETSNMP_DS_NOTIF_LOG_CTX,
                              "snmptrapd");
            traph = netsnmp_add_global_traphandler(NETSNMPTRAPD_POST_HANDLER,
                                                   notification_handler);
            traph->authtypes = TRAP_AUTH_LOG;
            init_notification_log();
        }
#endif
#ifdef USING_SNMPV3_SNMPENGINE_MODULE
        /*
         * register scalars from SNMP-FRAMEWORK-MIB::snmpEngineID group;
         * allows engineID probes via the master agent under the
         * snmptrapd context
         */
        register_snmpEngine_scalars_context("snmptrapd");
#endif
    }
#endif /* USING_AGENTX_SUBAGENT_MODULE && !NETSNMP_SNMPTRAPD_DISABLE_AGENTX */

    /* register our authorization handler */
    init_netsnmp_trapd_auth();

#if defined(USING_AGENTX_SUBAGENT_MODULE) && !defined(NETSNMP_SNMPTRAPD_DISABLE_AGENTX)
    if (agentx_subagent) {
#ifdef USING_AGENT_NSVACMACCESSTABLE_MODULE
        extern void init_register_nsVacm_context(const char *);
#endif
#ifdef USING_SNMPV3_USMUSER_MODULE
        extern void init_register_usmUser_context(const char *);
        /* register ourselves as having a USM user database */
        init_register_usmUser_context("snmptrapd");
#endif
#ifdef USING_AGENT_NSVACMACCESSTABLE_MODULE
        /* register net-snmp vacm extensions */
        init_register_nsVacm_context("snmptrapd");
#endif
    }
#endif

#ifdef NETSNMP_EMBEDDED_PERL
    init_perl();
    {
        /* set the default path to load */
        char            init_file[SNMP_MAXBUF];
        snprintf(init_file, sizeof(init_file) - 1,
                 "%s/%s", SNMPSHAREPATH, "snmp_perl_trapd.pl");
        netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
                              NETSNMP_DS_AGENT_PERL_INIT_FILE,
                              init_file);
    }
#endif

    /*
     * Initialize the world.
     */
    init_snmp("snmptrapd");

#ifdef SIGHUP
    signal(SIGHUP, hup_handler);
#endif

    if (trap1_fmt_str_remember) {
        free_trap1_fmt();
        free_trap2_fmt();
        print_format1 = strdup(trap1_fmt_str_remember);
        print_format2 = strdup(trap1_fmt_str_remember);
    }

    if (netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID, 
			       NETSNMP_DS_AGENT_QUIT_IMMEDIATELY)) {
        /*
         * just starting up to process specific configuration and then
         * shutting down immediately. 
         */
        netsnmp_running = 0;
    }

    /*
     * if no logging options on command line or in conf files, use syslog
     */
    if (0 == snmp_get_do_logging()) {
#ifdef WIN32
        snmp_enable_syslog_ident(app_name_long, Facility);
#else
        snmp_enable_syslog_ident(app_name, Facility);
#endif        
    }

#ifndef WIN32
    /*
     * fork the process to the background if we are not printing to stderr 
     */
    if (dofork && netsnmp_running) {
        int             fd;

        switch (fork()) {
        case -1:
            fprintf(stderr, "bad fork - %s\n", strerror(errno));
            _exit(1);

        case 0:
            /*
             * become process group leader 
             */
            if (setsid() == -1) {
                fprintf(stderr, "bad setsid - %s\n", strerror(errno));
                _exit(1);
            }

            /*
             * if we are forked, we don't want to print out to stdout or stderr 
             */
            fd = open("/dev/null", O_RDWR);
            dup2(fd, STDIN_FILENO);
            dup2(fd, STDOUT_FILENO);
            dup2(fd, STDERR_FILENO);
            close(fd);
            break;

        default:
            _exit(0);
        }
    }
#endif                          /* WIN32 */
#if HAVE_GETPID
    if (pid_file != NULL) {
        if ((PID = fopen(pid_file, "w")) == NULL) {
            snmp_log_perror("fopen");
            exit(1);
        }
        fprintf(PID, "%d\n", (int) getpid());
        fclose(PID);
        free_config_pidFile();
    }
#endif

    snmp_log(LOG_INFO, "NET-SNMP version %s\n", netsnmp_get_version());
    if (depmsg) {
        snmp_log(LOG_WARNING, "-s and -S options are deprecated; use -Ls <facility> instead\n");
    }
    
    if (listen_ports)
        cp = listen_ports;
    else
        cp = default_port;

    while (cp != NULL) {
        char *sep = strchr(cp, ',');

        if (sep != NULL) {
            *sep = 0;
        }

        transport = netsnmp_transport_open_server("snmptrap", cp);
        if (transport == NULL) {
            snmp_log(LOG_ERR, "couldn't open %s -- errno %d (\"%s\")\n",
                     cp, errno, strerror(errno));
            snmptrapd_close_sessions(sess_list);
            SOCK_CLEANUP;
            exit(1);
        } else {
            ss = snmptrapd_add_session(transport);
            if (ss == NULL) {
                /*
                 * Shouldn't happen?  We have already opened the transport
                 * successfully so what could have gone wrong?  
                 */
                snmptrapd_close_sessions(sess_list);
                netsnmp_transport_free(transport);
                snmp_log(LOG_ERR, "couldn't open snmp - %s", strerror(errno));
                SOCK_CLEANUP;
                exit(1);
            } else {
                ss->next = sess_list;
                sess_list = ss;
            }
        }

        /*
         * Process next listen address, if there is one.  
         */

        if (sep != NULL) {
            *sep = ',';
            cp = sep + 1;
        } else {
            cp = NULL;
        }
    }

    /*
     * ignore early sighup during startup
     */
    reconfig = 0;

#if HAVE_UNISTD_H
#ifdef HAVE_SETGID
    if ((gid = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID, 
				  NETSNMP_DS_AGENT_GROUPID)) != 0) {
        DEBUGMSGTL(("snmptrapd/main", "Changing gid to %d.\n", gid));
        if (setgid(gid) == -1
#ifdef HAVE_SETGROUPS
            || setgroups(1, (gid_t *)&gid) == -1
#endif
            ) {
            snmp_log_perror("setgid failed");
            if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID, 
					NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
                exit(1);
            }
        }
    }
#endif
#ifdef HAVE_SETUID
    if ((uid = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID, 
				  NETSNMP_DS_AGENT_USERID)) != 0) {
        DEBUGMSGTL(("snmptrapd/main", "Changing uid to %d.\n", uid));
        if (setuid(uid) == -1) {
            snmp_log_perror("setuid failed");
            if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID, 
					NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
                exit(1);
            }
        }
    }
#endif
#endif

#ifdef WIN32SERVICE
    trapd_status = SNMPTRAPD_RUNNING;
#endif
    while (netsnmp_running) {
        if (reconfig) {
                /*
                 * If we are logging to a file, receipt of SIGHUP also
                 * indicates the the log file should be closed and
                 * re-opened.  This is useful for users that want to
                 * rotate logs in a more predictable manner.
                 */
                netsnmp_logging_restart();
                snmp_log(LOG_INFO, "NET-SNMP version %s restarted\n",
                         netsnmp_get_version());
            trapd_update_config();
            if (trap1_fmt_str_remember) {
                free_trap1_fmt();
                free_trap2_fmt();
                print_format1 = strdup(trap1_fmt_str_remember);
                print_format2 = strdup(trap1_fmt_str_remember);
            }
            reconfig = 0;
        }
        numfds = 0;
        FD_ZERO(&readfds);
        FD_ZERO(&writefds);
        FD_ZERO(&exceptfds);
        block = 0;
        tvp = &timeout;
        timerclear(tvp);
        tvp->tv_sec = 5;
        snmp_select_info(&numfds, &readfds, tvp, &block);
        if (block == 1)
            tvp = NULL;         /* block without timeout */
        netsnmp_external_event_info(&numfds, &readfds, &writefds, &exceptfds);
        count = select(numfds, &readfds, &writefds, &exceptfds, tvp);
        gettimeofday(&Now, 0);
        if (count > 0) {
            netsnmp_dispatch_external_events(&count, &readfds, &writefds,
                                             &exceptfds);
            /* If there are any more events after external events, then
             * try SNMP events. */
            if (count > 0) {
                snmp_read(&readfds);
            }
        } else
            switch (count) {
            case 0:
                snmp_timeout();
                break;
            case -1:
                if (errno == EINTR)
                    continue;
                snmp_log_perror("select");
                netsnmp_running = 0;
                break;
            default:
                fprintf(stderr, "select returned %d\n", count);
                netsnmp_running = 0;
            }
	run_alarms();
    }

    if (snmp_get_do_logging()) {
        struct tm      *tm;
        time_t          timer;
        time(&timer);
        tm = localtime(&timer);
        snmp_log(LOG_INFO,
                "%.4d-%.2d-%.2d %.2d:%.2d:%.2d NET-SNMP version %s Stopped.\n",
                 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour,
                 tm->tm_min, tm->tm_sec, netsnmp_get_version());
    }
    snmp_log(LOG_INFO, "Stopping snmptrapd");
    
    snmptrapd_close_sessions(sess_list);
    snmp_shutdown("snmptrapd");
#ifdef WIN32SERVICE
    trapd_status = SNMPTRAPD_STOPPED;
#endif
    snmp_disable_log();
    SOCK_CLEANUP;
    return 0;
}