external/bsd/ntp/dist/ntpsnmpd/ntpsnmpd.c

   1 /*      $NetBSD$        */
   2
   3 /*****************************************************************************
   4  *
   5  *  ntpsnmpd.c
   6  *
   7  *  The NTP SNMP daemon is an Agent X subagent application that
   8  *  registers itself with a running SNMP Agent X master process running
   9  *  on the same machine on port TCP 705. It utilizes the libntqp library
  10  *  which accesses status and general data of a running ntpd process on
  11  *  the same machine and enables the user to monitor the status of a
  12  *  ntp daemon process via SNMP.
  13  *
  14  *  This started as a Google Summer of Code 2008 project,
  15  *  including the ntpsnmpd sub agent and the libntpq library.
  16  *
  17  *  For more information please visit
  18  *      http://support.ntp.org/bin/view/Dev/GSoC2008snmp
  19  *  Or contact:
  20  *   Harlan Stenn   (Mentor) at stenn@ntp.org
  21  *   Heiko Gerstung (Student) at gerstung@ntp.org
  22  *
  23  ****************************************************************************/
  24
  25 #include <signal.h>
  26 #include <sys/time.h>
  27
  28 #ifdef SOLARIS /* needed with at least Solaris 8 */
  29 #include <siginfo.h>
  30 #endif
  31
  32 #include <net-snmp/net-snmp-config.h>
  33 #include <net-snmp/net-snmp-includes.h>
  34 #include <net-snmp/agent/net-snmp-agent-includes.h>
  35 #include <ntpSnmpSubagentObject.h>
  36
  37 #undef PACKAGE_BUGREPORT
  38 #undef PACKAGE_NAME
  39 #undef PACKAGE_STRING
  40 #undef PACKAGE_TARNAME
  41 #undef PACKAGE_VERSION
  42
  43 #include <libntpq.h>
  44 #include <ntpsnmpd-opts.h>
  45
  46 static int keep_running;
  47
  48 RETSIGTYPE
  49 stop_server(int a) {
  50     keep_running = 0;
  51 }
  52
  53 /* The main function just sets up a few things and then enters a loop in which it will
  54  * wait for SNMP requests coming from the master agent
  55  */
  56
  57 int
  58 main (int argc, char **argv) {
  59   int background = 0; /* start as background process */
  60   int use_syslog = 1; /* use syslog for logging */
  61   char varvalue[1024];
  62
  63
  64         {
  65                 int optct = optionProcess(&ntpsnmpdOptions, argc, argv);
  66                 argc -= optct;
  67                 argv += optct;
  68         }
  69
  70         if (!HAVE_OPT(NOFORK))
  71                 background = 1;
  72
  73         if (!HAVE_OPT(SYSLOG))
  74                 use_syslog = 0;
  75
  76   /* using the net-snmp syslog facility */
  77   if (use_syslog)
  78     snmp_enable_calllog();
  79   else
  80     snmp_enable_stderrlog();
  81
  82   /* Become Subagent */
  83     netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE, 1);
  84
  85   /* go into background mode, if requested */
  86   if (background && netsnmp_daemonize(1, !use_syslog))
  87       exit(1);
  88
  89   /* Now register with the master Agent X process */
  90
  91   /* call Netsnmp socket startup macro, which will initialize the network stuff if required */
  92   SOCK_STARTUP;
  93
  94   /* Set AgentX socket interface */
  95   netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
  96                             NETSNMP_DS_AGENT_X_SOCKET, "tcp:localhost:705");
  97
  98   init_agent("ntpsnmpd");
  99
 100   /* Try to connect to ntpd */
 101   if ( ntpq_openhost("localhost") == 0 )
 102   {
 103         fprintf(stderr, "Error: Could not connect to ntpd. Aborting.\n");
 104         exit(1);
 105   }
 106
 107
 108   /* Register callback functions ...  */
 109   init_ntpSnmpSubagentObject();
 110   init_snmp("ntpsnmpd");
 111
 112   /* Signal handler */
 113   keep_running = 1;
 114   signal(SIGTERM, stop_server);
 115   signal(SIGINT, stop_server);
 116
 117   snmp_log(LOG_INFO,"ntpsnmpd started.\n");
 118
 119   /* main loop here... */
 120   while(keep_running) {
 121         agent_check_and_process(1); /* 0 == don't block */
 122   }
 123
 124   /* at shutdown time */
 125   ntpq_closehost();
 126   snmp_shutdown("ntpsnmpd");
 127   SOCK_CLEANUP;
 128
 129   return 0;
 130 }
 131