openvpn plugin: Add a plugin to read OpenVPN statistics.

Simple but useful module for monitoring per-client openvpn traffic..

The plugin reads a statistics file maintained by OpenVPN. The location of the
statistics file is configurable.

Signed-off-by: Doug MacEachern <dougm@hyperic.com>
Signed-off-by: Florian Forster <octo@huhu.verplant.org>

diff --git a/README b/README
index 5c9eed0..9b06f64 100644 (file)
--- a/README
+++ b/README
@@ -146,6 +146,10 @@ Features
       Read onewire sensors using the owcapu library of the owfs project.
       Please read in collectd.conf(5) why this plugin is experimental.
 
+    - openvpn
+      RX and TX of each client in openvpn-status.log (status-version 2).
+      <http://openvpn.net/index.php/documentation/howto.html>
+
     - perl
       The perl plugin implements a Perl-interpreter into collectd. You can
       write your own plugins in Perl and return arbitrary values using this

diff --git a/configure.in b/configure.in
index 6b8571d..55ce936 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -3008,6 +3008,7 @@ AC_PLUGIN([notify_email], [$with_libesmtp],    [Email notifier])
 AC_PLUGIN([ntpd],        [yes],                [NTPd statistics])
 AC_PLUGIN([nut],         [$with_libupsclient], [Network UPS tools statistics])
 AC_PLUGIN([onewire],     [$with_libowcapi],    [OneWire sensor statistics])
+AC_PLUGIN([openvpn],     [yes],                [OpenVPN client statistics])
 AC_PLUGIN([oracle],      [$with_oracle],       [Oracle plugin])
 AC_PLUGIN([perl],        [$plugin_perl],       [Embed a Perl interpreter])
 AC_PLUGIN([ping],        [$with_liboping],     [Network latency statistics])
@@ -3188,6 +3189,7 @@ Configuration:
     ntpd  . . . . . . . . $enable_ntpd
     nut . . . . . . . . . $enable_nut
     onewire . . . . . . . $enable_onewire
+    openvpn . . . . . . . $enable_openvpn
     oracle  . . . . . . . $enable_oracle
     perl  . . . . . . . . $enable_perl
     ping  . . . . . . . . $enable_ping

diff --git a/src/Makefile.am b/src/Makefile.am
index f5776d5..892ddea 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -570,6 +570,15 @@ collectd_LDADD += "-dlopen" onewire.la
 collectd_DEPENDENCIES += onewire.la
 endif
 
+if BUILD_PLUGIN_OPENVPN
+pkglib_LTLIBRARIES += openvpn.la
+openvpn_la_SOURCES = openvpn.c
+openvpn_la_CFLAGS = $(AM_CFLAGS)
+openvpn_la_LDFLAGS = -module -avoid-version
+collectd_LDADD += "-dlopen" openvpn.la
+collectd_DEPENDENCIES += openvpn.la
+endif
+
 if BUILD_PLUGIN_ORACLE
 pkglib_LTLIBRARIES += oracle.la
 oracle_la_SOURCES = oracle.c

diff --git a/src/collectd.conf.in b/src/collectd.conf.in
index 01017e3..0c27edc 100644 (file)
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -64,6 +64,7 @@ FQDNLookup   true
 @BUILD_PLUGIN_NTPD_TRUE@LoadPlugin ntpd
 @BUILD_PLUGIN_NUT_TRUE@LoadPlugin nut
 @BUILD_PLUGIN_ONEWIRE_TRUE@LoadPlugin onewire
+@BUILD_PLUGIN_OPENVPN_TRUE@LoadPlugin openvpn
 @BUILD_PLUGIN_PERL_TRUE@LoadPlugin perl
 @BUILD_PLUGIN_PING_TRUE@LoadPlugin ping
 @BUILD_PLUGIN_POSTGRESQL_TRUE@LoadPlugin postgresql

diff --git a/src/openvpn.c b/src/openvpn.c
new file mode 100644 (file)
index 0000000..16d4502
--- /dev/null
+++ b/src/openvpn.c
@@ -0,0 +1,136 @@
+/**
+ * collectd - src/openvpn.c
+ * Copyright (C) 2008  Doug MacEachern
+ * Copyright (C) 2008  Florian octo Forster
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; only version 2 of the License is applicable.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ *
+ * Authors:
+ *   Doug MacEachern <dougm at hyperic.com>
+ *   Florian octo Forster <octo at verplant.org>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+
+static char *status_file = "/etc/openvpn/openvpn-status.log";
+
+static const char *config_keys[] =
+{
+       "StatusFile"
+};
+static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
+
+/* copy-n-pasted from common.c - changed delim to "," */
+static int openvpn_strsplit (char *string, char **fields, size_t size)
+{
+        size_t i;
+        char *ptr;
+        char *saveptr;
+
+        i = 0;
+        ptr = string;
+        saveptr = NULL;
+        while ((fields[i] = strtok_r (ptr, ",", &saveptr)) != NULL)
+        {
+                ptr = NULL;
+                i++;
+
+                if (i >= size)
+                        break;
+        }
+
+        return (i);
+} /* int openvpn_strsplit */
+
+static void openvpn_submit (char *name, counter_t rx, counter_t tx)
+{
+       value_t values[2];
+       value_list_t vl = VALUE_LIST_INIT;
+
+       values[0].counter = rx;
+       values[1].counter = tx;
+
+       vl.values = values;
+       vl.values_len = STATIC_ARRAY_SIZE (values);
+       vl.time = time (NULL);
+       sstrncpy (vl.host, hostname_g, sizeof (vl.host));
+       sstrncpy (vl.plugin, "openvpn", sizeof (vl.plugin));
+       sstrncpy (vl.type_instance, name, sizeof (vl.type_instance));
+       sstrncpy (vl.type, "if_octets", sizeof (vl.type));
+
+       plugin_dispatch_values (&vl);
+} /* void openvpn_submit */
+
+static int openvpn_read (void)
+{
+       char *name;
+       counter_t rx, tx;
+       FILE *fh;
+       char buffer[1024];
+       char *fields[8];
+       const int max_fields = sizeof(fields)/sizeof(fields[0]);
+       int   fields_num;
+       static const char *prefix = "CLIENT_LIST,";
+
+       fh = fopen (status_file, "r");
+       if (fh == NULL)
+               return (-1);
+
+        /* status file is generated by openvpn/multi.c:multi_print_status()
+        * this plugin requires server.conf: "status-version 2"
+         * http://svn.openvpn.net/projects/openvpn/trunk/openvpn/multi.c
+         */
+       while (fgets (buffer, sizeof (buffer), fh) != NULL)
+       {
+               if (strncmp(buffer, prefix, strlen(prefix)) != 0)
+               {
+                       continue;
+               }
+
+               fields_num = openvpn_strsplit (buffer, fields, max_fields);
+               if (fields_num != max_fields)
+               {
+                       continue;
+               }
+               name =      fields[1];  /* "Common Name" */
+               rx = atoll (fields[4]); /* "Bytes Received */
+               tx = atoll (fields[5]); /* "Bytes Sent" */
+               openvpn_submit (name, rx, tx);
+       }
+       fclose (fh);
+
+       return (0);
+} /* int openvpn_read */
+
+static int openvpn_config (const char *key, const char *value)
+{
+       if (strcasecmp ("StatusFile", key) == 0)
+       {
+               status_file = strdup(value);
+       }
+       else
+       {
+               return (-1);
+       }
+        return (0);
+} /* int openvpn_config */
+
+void module_register (void)
+{
+       plugin_register_config ("openvpn", openvpn_config,
+                               config_keys, config_keys_num);
+       plugin_register_read ("openvpn", openvpn_read);
+} /* void module_register */