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 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "configfile.h"
28 #define MODULE_NAME "ping"
30 #include <netinet/in.h>
31 #include "libping/ping.h"
33 #define MAX_PINGHOSTS 32
35 static char *hosts[MAX_PINGHOSTS];
36 static int hosts_flags[MAX_PINGHOSTS];
37 static int hosts_disable[MAX_PINGHOSTS];
38 static int hosts_backoff[MAX_PINGHOSTS];
39 static int num_pinghosts;
41 static char *file_template = "ping-%s.rrd";
43 static char *ds_def[] =
44 {
45 "DS:ping:GAUGE:25:0:65535",
46 NULL
47 };
48 static int ds_num = 1;
50 static char *config_keys[] =
51 {
52 "Host",
53 NULL
54 };
55 static int config_keys_num = 1;
57 static void ping_init (void)
58 {
59 int i;
61 for (i = 0; i < MAX_PINGHOSTS; i++)
62 {
63 hosts_flags[i] = 0;
64 hosts_disable[i] = 0;
65 hosts_backoff[i] = 1;
66 }
68 return;
69 }
71 static int ping_config (char *key, char *value)
72 {
73 if (strcasecmp (key, "host"))
74 {
75 return (-1);
76 }
77 else if (num_pinghosts >= MAX_PINGHOSTS)
78 {
79 return (1);
80 }
81 else if ((hosts[num_pinghosts] = strdup (value)) == NULL)
82 {
83 return (2);
84 }
85 else
86 {
87 hosts_flags[num_pinghosts] = 0;
88 num_pinghosts++;
89 return (0);
90 }
91 }
93 static void ping_write (char *host, char *inst, char *val)
94 {
95 char file[512];
96 int status;
98 status = snprintf (file, 512, file_template, inst);
99 if (status < 1)
100 return;
101 else if (status >= 512)
102 return;
104 rrd_update_file (host, file, val, ds_def, ds_num);
105 }
107 #define BUFSIZE 256
108 static void ping_submit (int ping_time, char *host)
109 {
110 char buf[BUFSIZE];
112 if (snprintf (buf, BUFSIZE, "%u:%u", (unsigned int) curtime, ping_time) >= BUFSIZE)
113 return;
115 plugin_submit (MODULE_NAME, host, buf);
116 }
117 #undef BUFSIZE
119 static void ping_read (void)
120 {
121 int ping;
122 int i;
124 for (i = 0; i < num_pinghosts; i++)
125 {
126 if (hosts_disable[i] > 0)
127 {
128 hosts_disable[i]--;
129 continue;
130 }
132 ping = tpinghost (hosts[i]);
134 switch (ping)
135 {
136 case 0:
137 if (!(hosts_flags[i] & 0x01))
138 syslog (LOG_WARNING, "ping %s: Connection timed out.", hosts[i]);
139 hosts_flags[i] |= 0x01;
140 break;
142 case -1:
143 if (!(hosts_flags[i] & 0x02))
144 syslog (LOG_WARNING, "ping %s: Host or service is not reachable.", hosts[i]);
145 hosts_flags[i] |= 0x02;
146 break;
148 case -2:
149 syslog (LOG_ERR, "ping %s: Socket error. Ping will be disabled for %i iteration(s).",
150 hosts[i], hosts_backoff[i]);
151 hosts_disable[i] = hosts_backoff[i];
152 if (hosts_backoff[i] < 8192) /* 22 3/4 hours */
153 hosts_backoff[i] *= 2;
154 hosts_flags[i] |= 0x10;
155 break;
157 case -3:
158 if (!(hosts_flags[i] & 0x04))
159 syslog (LOG_WARNING, "ping %s: Connection refused.", hosts[i]);
160 hosts_flags[i] |= 0x04;
161 break;
163 default:
164 if (hosts_flags[i] != 0x00)
165 syslog (LOG_NOTICE, "ping %s: Back to normal: %ims.", hosts[i], ping);
166 hosts_flags[i] = 0x00;
167 hosts_backoff[i] = 1;
168 ping_submit (ping, hosts[i]);
169 } /* switch (ping) */
170 } /* for (i = 0; i < num_pinghosts; i++) */
171 }
173 void module_register (void)
174 {
175 plugin_register (MODULE_NAME, ping_init, ping_read, ping_write);
176 cf_register (MODULE_NAME, ping_config, config_keys, config_keys_num);
177 }
179 #undef MODULE_NAME