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Annotation of embedaddon/ntp/ntpsnmpd/ntpsnmpd.c, revision 1.1.1.1

1.1       misho       1: /*****************************************************************************
                      2:  *
                      3:  *  ntpsnmpd.c
                      4:  *
                      5:  *  The NTP SNMP daemon is an Agent X subagent application that 
                      6:  *  registers itself with a running SNMP Agent X master process running
                      7:  *  on the same machine on port TCP 705. It utilizes the libntqp library
                      8:  *  which accesses status and general data of a running ntpd process on
                      9:  *  the same machine and enables the user to monitor the status of a
                     10:  *  ntp daemon process via SNMP. 
                     11:  *
                     12:  *  This started as a Google Summer of Code 2008 project, 
                     13:  *  including the ntpsnmpd sub agent and the libntpq library. 
                     14:  *
                     15:  *  For more information please visit
                     16:  *     http://support.ntp.org/bin/view/Dev/GSoC2008snmp
                     17:  *  Or contact:
                     18:  *   Harlan Stenn   (Mentor) at stenn@ntp.org
                     19:  *   Heiko Gerstung (Student) at gerstung@ntp.org 
                     20:  *
                     21:  ****************************************************************************/
                     22: 
                     23: #include <ntp_snmp.h>
                     24: #include <signal.h>
                     25: #include <sys/time.h>
                     26: 
                     27: #ifdef SOLARIS /* needed with at least Solaris 8 */
                     28: #include <siginfo.h>
                     29: #endif
                     30: 
                     31: #include <libntpq.h>
                     32: #include <ntpsnmpd-opts.h>
                     33: 
                     34: static int keep_running;
                     35: RETSIGTYPE stop_server(int);
                     36: 
                     37: RETSIGTYPE
                     38: stop_server(int a) {
                     39:     keep_running = 0;
                     40: }
                     41: 
                     42: /* The main function just sets up a few things and then enters a loop in which it will 
                     43:  * wait for SNMP requests coming from the master agent 
                     44:  */
                     45: 
                     46: int
                     47: main (int argc, char **argv) {
                     48:   int background = 0; /* start as background process */
                     49:   int use_syslog = 1; /* use syslog for logging */
                     50: 
                     51:        {
                     52:                int optct = optionProcess(&ntpsnmpdOptions, argc, argv);
                     53:                argc -= optct;
                     54:                argv += optct;
                     55:        }
                     56: 
                     57:        if (!HAVE_OPT(NOFORK))
                     58:                background = 1;
                     59: 
                     60:        if (!HAVE_OPT(SYSLOG))
                     61:                use_syslog = 0;
                     62: 
                     63:   /* using the net-snmp syslog facility */
                     64:   if (use_syslog)
                     65:     snmp_enable_calllog();
                     66:   else
                     67:     snmp_enable_stderrlog();
                     68: 
                     69:   /* Become Subagent */
                     70:     netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
                     71:  
                     72:   /* go into background mode, if requested */
                     73:   if (background && netsnmp_daemonize(1, !use_syslog))
                     74:       exit(1);
                     75: 
                     76:   /* Now register with the master Agent X process */
                     77: 
                     78:   /* call Netsnmp socket startup macro, which will initialize the network stuff if required */
                     79:   SOCK_STARTUP;
                     80: 
                     81:   /* Set AgentX socket interface */
                     82:   netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
                     83:                             NETSNMP_DS_AGENT_X_SOCKET, OPT_ARG( AGENTXSOCKET ));
                     84: 
                     85:   init_agent("ntpsnmpd");
                     86: 
                     87:   /* Try to connect to ntpd */
                     88:   if ( ntpq_openhost("localhost") == 0 )
                     89:   {
                     90:        fprintf(stderr, "Error: Could not connect to ntpd. Aborting.\n");
                     91:        exit(1);
                     92:   }
                     93:   
                     94: 
                     95:   /* Register callback functions ...  */
                     96:   init_ntpSnmpSubagentObject();  
                     97:   init_snmp("ntpsnmpd");
                     98: 
                     99:   /* Signal handler */
                    100:   keep_running = 1;
                    101:   signal(SIGTERM, stop_server);
                    102:   signal(SIGINT, stop_server);
                    103: 
                    104:   snmp_log(LOG_INFO,"ntpsnmpd started.\n");
                    105:   
                    106:   /* main loop here... */
                    107:   while(keep_running) {
                    108:        agent_check_and_process(1); /* 0 == don't block */
                    109:   }
                    110: 
                    111:   /* at shutdown time */
                    112:   ntpq_closehost();
                    113:   snmp_shutdown("ntpsnmpd");
                    114:   SOCK_CLEANUP;
                    115: 
                    116:   return 0;
                    117: }
                    118: