src/ping.c

   1 /**
   2  * collectd - src/ping.c
   3  * Copyright (C) 2005  Florian octo Forster
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  *
  19  * Authors:
  20  *   Florian octo Forster <octo at verplant.org>
  21  **/
  22
  23 #include "ping.h"
  24
  25 #if COLLECT_PING
  26 #define MODULE_NAME "ping"
  27
  28 #include "plugin.h"
  29 #include "common.h"
  30
  31 #include <netinet/in.h>
  32 #include "libping/ping.h"
  33
  34 extern char *pinghosts[MAX_PINGHOSTS];
  35 extern int   num_pinghosts;
  36 static int   pingerrors[MAX_PINGHOSTS];
  37
  38 static char *file_template = "ping-%s.rrd";
  39
  40 static char *ds_def[] =
  41 {
  42         "DS:ping:GAUGE:25:0:65535",
  43         NULL
  44 };
  45 static int ds_num = 1;
  46
  47 void ping_init (void)
  48 {
  49         int i;
  50
  51         for (i = 0; i < num_pinghosts; i++)
  52                 pingerrors[i] = 0;
  53
  54         return;
  55 }
  56
  57 void ping_write (char *host, char *inst, char *val)
  58 {
  59         char file[512];
  60         int status;
  61
  62         status = snprintf (file, 512, file_template, inst);
  63         if (status < 1)
  64                 return;
  65         else if (status >= 512)
  66                 return;
  67
  68         rrd_update_file (host, file, val, ds_def, ds_num);
  69 }
  70
  71 #define BUFSIZE 256
  72 void ping_submit (int ping_time, char *host)
  73 {
  74         char buf[BUFSIZE];
  75
  76         if (snprintf (buf, BUFSIZE, "%u:%u", (unsigned int) curtime, ping_time) >= BUFSIZE)
  77                 return;
  78
  79         plugin_submit (MODULE_NAME, host, buf);
  80 }
  81 #undef BUFSIZE
  82
  83 void ping_read (void)
  84 {
  85         int ping;
  86         int i;
  87
  88         for (i = 0; i < num_pinghosts; i++)
  89         {
  90                 if (pingerrors[i] & 0x30)
  91                         continue;
  92
  93                 ping = tpinghost (pinghosts[i]);
  94
  95                 switch (ping)
  96                 {
  97                         case 0:
  98                                 if (!(pingerrors[i] & 0x01))
  99                                         syslog (LOG_WARNING, "ping %s: Connection timed out.", pinghosts[i]);
 100                                 pingerrors[i] |= 0x01;
 101                                 break;
 102
 103                         case -1:
 104                                 if (!(pingerrors[i] & 0x02))
 105                                         syslog (LOG_WARNING, "ping %s: Host or service is not reachable.", pinghosts[i]);
 106                                 pingerrors[i] |= 0x02;
 107                                 break;
 108
 109                         case -2:
 110                                 syslog (LOG_ERR, "ping %s: Socket error. Ping will be disabled.", pinghosts[i]);
 111                                 pingerrors[i] |= 0x10;
 112                                 break;
 113
 114                         case -3:
 115                                 if (!(pingerrors[i] & 0x04))
 116                                         syslog (LOG_WARNING, "ping %s: Connection refused.", pinghosts[i]);
 117                                 pingerrors[i] |= 0x04;
 118                                 break;
 119
 120                         default:
 121                                 if (pingerrors[i] != 0x00)
 122                                         syslog (LOG_NOTICE, "ping %s: Back to normal: %ims.", pinghosts[i], ping);
 123                                 pingerrors[i] = 0x00;
 124                                 ping_submit (ping, pinghosts[i]);
 125                 } /* switch (ping) */
 126         } /* for (i = 0; i < num_pinghosts; i++) */
 127 }
 128
 129 void module_register (void)
 130 {
 131         plugin_register (MODULE_NAME, ping_init, ping_read, ping_write);
 132 }
 133
 134 #undef MODULE_NAME
 135 #endif /* COLLECT_PING */