forked from collectd/collectd
/
openvpn.c
729 lines (628 loc) · 18.2 KB
/
openvpn.c
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/**
* collectd - src/openvpn.c
* Copyright (C) 2008 Doug MacEachern
* Copyright (C) 2009 Florian octo Forster
* Copyright (C) 2009 Marco Chiappero
* Copyright (C) 2009 Fabian Schuh
*
* 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>
* Marco Chiappero <marco at absence.it>
* Fabian Schuh <mail at xeroc.org>
**/
#include "collectd.h"
#include "common.h"
#include "plugin.h"
#define V1STRING "Common Name,Real Address,Bytes Received,Bytes Sent,Connected Since\n"
#define V2STRING "HEADER,CLIENT_LIST,Common Name,Real Address,Virtual Address,Bytes Received,Bytes Sent,Connected Since,Connected Since (time_t)\n"
#define V3STRING "HEADER CLIENT_LIST Common Name Real Address Virtual Address Bytes Received Bytes Sent Connected Since Connected Since (time_t)\n"
#define VSSTRING "OpenVPN STATISTICS\n"
struct vpn_status_s
{
char *file;
enum
{
MULTI1 = 1, /* status-version 1 */
MULTI2, /* status-version 2 */
MULTI3, /* status-version 3 */
SINGLE = 10 /* currently no versions for single mode, maybe in the future */
} version;
char *name;
};
typedef struct vpn_status_s vpn_status_t;
static vpn_status_t **vpn_list = NULL;
static int vpn_num = 0;
static _Bool new_naming_schema = 0;
static _Bool collect_compression = 1;
static _Bool collect_user_count = 0;
static _Bool collect_individual_users = 1;
static const char *config_keys[] =
{
"StatusFile",
"Compression", /* old, deprecated name */
"ImprovedNamingSchema",
"CollectCompression",
"CollectUserCount",
"CollectIndividualUsers"
};
static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
/* Helper function
* 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 */
/* dispatches number of users */
static void numusers_submit (char *pinst, char *tinst, gauge_t value)
{
value_t values[1];
value_list_t vl = VALUE_LIST_INIT;
values[0].gauge = value;
vl.values = values;
vl.values_len = STATIC_ARRAY_SIZE (values);
sstrncpy (vl.host, hostname_g, sizeof (vl.host));
sstrncpy (vl.plugin, "openvpn", sizeof (vl.plugin));
sstrncpy (vl.type, "users", sizeof (vl.type));
if (pinst != NULL)
sstrncpy (vl.plugin_instance, pinst, sizeof (vl.plugin_instance));
if (tinst != NULL)
sstrncpy (vl.type_instance, tinst, sizeof (vl.type_instance));
plugin_dispatch_values (&vl);
} /* void numusers_submit */
/* dispatches stats about traffic (TCP or UDP) generated by the tunnel per single endpoint */
static void iostats_submit (char *pinst, char *tinst, 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;
/* NOTE ON THE NEW NAMING SCHEMA:
* using plugin_instance to identify each vpn config (and
* status) file; using type_instance to identify the endpoint
* host when in multimode, traffic or overhead when in single.
*/
vl.values = values;
vl.values_len = STATIC_ARRAY_SIZE (values);
sstrncpy (vl.host, hostname_g, sizeof (vl.host));
sstrncpy (vl.plugin, "openvpn", sizeof (vl.plugin));
if (pinst != NULL)
sstrncpy (vl.plugin_instance, pinst,
sizeof (vl.plugin_instance));
sstrncpy (vl.type, "if_octets", sizeof (vl.type));
if (tinst != NULL)
sstrncpy (vl.type_instance, tinst, sizeof (vl.type_instance));
plugin_dispatch_values (&vl);
} /* void traffic_submit */
/* dispatches stats about data compression shown when in single mode */
static void compression_submit (char *pinst, char *tinst,
counter_t uncompressed, counter_t compressed)
{
value_t values[2];
value_list_t vl = VALUE_LIST_INIT;
values[0].counter = uncompressed;
values[1].counter = compressed;
vl.values = values;
vl.values_len = STATIC_ARRAY_SIZE (values);
sstrncpy (vl.host, hostname_g, sizeof (vl.host));
sstrncpy (vl.plugin, "openvpn", sizeof (vl.plugin));
if (pinst != NULL)
sstrncpy (vl.plugin_instance, pinst,
sizeof (vl.plugin_instance));
sstrncpy (vl.type, "compression", sizeof (vl.type));
if (tinst != NULL)
sstrncpy (vl.type_instance, tinst, sizeof (vl.type_instance));
plugin_dispatch_values (&vl);
} /* void compression_submit */
static int single_read (char *name, FILE *fh)
{
char buffer[1024];
char *fields[4];
const int max_fields = STATIC_ARRAY_SIZE (fields);
int fields_num, read = 0;
counter_t link_rx, link_tx;
counter_t tun_rx, tun_tx;
counter_t pre_compress, post_compress;
counter_t pre_decompress, post_decompress;
counter_t overhead_rx, overhead_tx;
link_rx = 0;
link_tx = 0;
tun_rx = 0;
tun_tx = 0;
pre_compress = 0;
post_compress = 0;
pre_decompress = 0;
post_decompress = 0;
overhead_rx = 0;
overhead_tx = 0;
while (fgets (buffer, sizeof (buffer), fh) != NULL)
{
fields_num = openvpn_strsplit (buffer, fields, max_fields);
/* status file is generated by openvpn/sig.c:print_status()
* http://svn.openvpn.net/projects/openvpn/trunk/openvpn/sig.c
*
* The line we're expecting has 2 fields. We ignore all lines
* with more or less fields.
*/
if (fields_num != 2)
{
continue;
}
if (strcmp (fields[0], "TUN/TAP read bytes") == 0)
{
/* read from the system and sent over the tunnel */
tun_tx = atoll (fields[1]);
}
else if (strcmp (fields[0], "TUN/TAP write bytes") == 0)
{
/* read from the tunnel and written in the system */
tun_rx = atoll (fields[1]);
}
else if (strcmp (fields[0], "TCP/UDP read bytes") == 0)
{
link_rx = atoll (fields[1]);
}
else if (strcmp (fields[0], "TCP/UDP write bytes") == 0)
{
link_tx = atoll (fields[1]);
}
else if (strcmp (fields[0], "pre-compress bytes") == 0)
{
pre_compress = atoll (fields[1]);
}
else if (strcmp (fields[0], "post-compress bytes") == 0)
{
post_compress = atoll (fields[1]);
}
else if (strcmp (fields[0], "pre-decompress bytes") == 0)
{
pre_decompress = atoll (fields[1]);
}
else if (strcmp (fields[0], "post-decompress bytes") == 0)
{
post_decompress = atoll (fields[1]);
}
}
iostats_submit (name, "traffic", link_rx, link_tx);
/* we need to force this order to avoid negative values with these unsigned */
overhead_rx = (((link_rx - pre_decompress) + post_decompress) - tun_rx);
overhead_tx = (((link_tx - post_compress) + pre_compress) - tun_tx);
iostats_submit (name, "overhead", overhead_rx, overhead_tx);
if (collect_compression)
{
compression_submit (name, "data_in", post_decompress, pre_decompress);
compression_submit (name, "data_out", pre_compress, post_compress);
}
read = 1;
return (read);
} /* int single_read */
/* for reading status version 1 */
static int multi1_read (char *name, FILE *fh)
{
char buffer[1024];
char *fields[10];
int fields_num, read = 0, found_header = 0;
long long sum_users = 0;
/* read the file until the "ROUTING TABLE" line is found (no more info after) */
while (fgets (buffer, sizeof (buffer), fh) != NULL)
{
if (strcmp (buffer, "ROUTING TABLE\n") == 0)
break;
if (strcmp (buffer, V1STRING) == 0)
{
found_header = 1;
continue;
}
/* skip the first lines until the client list section is found */
if (found_header == 0)
/* we can't start reading data until this string is found */
continue;
fields_num = openvpn_strsplit (buffer,
fields, STATIC_ARRAY_SIZE (fields));
if (fields_num < 4)
continue;
if (collect_user_count)
/* If so, sum all users, ignore the individuals*/
{
sum_users += 1;
}
if (collect_individual_users)
{
if (new_naming_schema)
{
iostats_submit (name, /* vpn instance */
fields[0], /* "Common Name" */
atoll (fields[2]), /* "Bytes Received" */
atoll (fields[3])); /* "Bytes Sent" */
}
else
{
iostats_submit (fields[0], /* "Common Name" */
NULL, /* unused when in multimode */
atoll (fields[2]), /* "Bytes Received" */
atoll (fields[3])); /* "Bytes Sent" */
}
}
read = 1;
}
if (collect_user_count)
{
numusers_submit(name, name, sum_users);
read = 1;
}
return (read);
} /* int multi1_read */
/* for reading status version 2 */
static int multi2_read (char *name, FILE *fh)
{
char buffer[1024];
char *fields[10];
const int max_fields = STATIC_ARRAY_SIZE (fields);
int fields_num, read = 0;
long long sum_users = 0;
while (fgets (buffer, sizeof (buffer), fh) != NULL)
{
fields_num = openvpn_strsplit (buffer, fields, max_fields);
/* status file is generated by openvpn/multi.c:multi_print_status()
* http://svn.openvpn.net/projects/openvpn/trunk/openvpn/multi.c
*
* The line we're expecting has 8 fields. We ignore all lines
* with more or less fields.
*/
if (fields_num != 8)
continue;
if (strcmp (fields[0], "CLIENT_LIST") != 0)
continue;
if (collect_user_count)
/* If so, sum all users, ignore the individuals*/
{
sum_users += 1;
}
if (collect_individual_users)
{
if (new_naming_schema)
{
/* plugin inst = file name, type inst = fields[1] */
iostats_submit (name, /* vpn instance */
fields[1], /* "Common Name" */
atoll (fields[4]), /* "Bytes Received" */
atoll (fields[5])); /* "Bytes Sent" */
}
else
{
/* plugin inst = fields[1], type inst = "" */
iostats_submit (fields[1], /* "Common Name" */
NULL, /* unused when in multimode */
atoll (fields[4]), /* "Bytes Received" */
atoll (fields[5])); /* "Bytes Sent" */
}
}
read = 1;
}
if (collect_user_count)
{
numusers_submit(name, name, sum_users);
read = 1;
}
return (read);
} /* int multi2_read */
/* for reading status version 3 */
static int multi3_read (char *name, FILE *fh)
{
char buffer[1024];
char *fields[15];
const int max_fields = STATIC_ARRAY_SIZE (fields);
int fields_num, read = 0;
long long sum_users = 0;
while (fgets (buffer, sizeof (buffer), fh) != NULL)
{
fields_num = strsplit (buffer, fields, max_fields);
/* status file is generated by openvpn/multi.c:multi_print_status()
* http://svn.openvpn.net/projects/openvpn/trunk/openvpn/multi.c
*
* The line we're expecting has 12 fields. We ignore all lines
* with more or less fields.
*/
if (fields_num != 12)
{
continue;
}
else
{
if (strcmp (fields[0], "CLIENT_LIST") != 0)
continue;
if (collect_user_count)
/* If so, sum all users, ignore the individuals*/
{
sum_users += 1;
}
if (collect_individual_users)
{
if (new_naming_schema)
{
iostats_submit (name, /* vpn instance */
fields[1], /* "Common Name" */
atoll (fields[4]), /* "Bytes Received" */
atoll (fields[5])); /* "Bytes Sent" */
}
else
{
iostats_submit (fields[1], /* "Common Name" */
NULL, /* unused when in multimode */
atoll (fields[4]), /* "Bytes Received" */
atoll (fields[5])); /* "Bytes Sent" */
}
}
read = 1;
}
}
if (collect_user_count)
{
numusers_submit(name, name, sum_users);
read = 1;
}
return (read);
} /* int multi3_read */
/* read callback */
static int openvpn_read (void)
{
FILE *fh;
int i, read;
read = 0;
/* call the right read function for every status entry in the list */
for (i = 0; i < vpn_num; i++)
{
fh = fopen (vpn_list[i]->file, "r");
if (fh == NULL)
{
char errbuf[1024];
WARNING ("openvpn plugin: fopen(%s) failed: %s", vpn_list[i]->file,
sstrerror (errno, errbuf, sizeof (errbuf)));
continue;
}
switch (vpn_list[i]->version)
{
case SINGLE:
read = single_read(vpn_list[i]->name, fh);
break;
case MULTI1:
read = multi1_read(vpn_list[i]->name, fh);
break;
case MULTI2:
read = multi2_read(vpn_list[i]->name, fh);
break;
case MULTI3:
read = multi3_read(vpn_list[i]->name, fh);
break;
}
fclose (fh);
}
return (read ? 0 : -1);
} /* int openvpn_read */
static int version_detect (const char *filename)
{
FILE *fh;
char buffer[1024];
int version = 0;
/* Sanity checking. We're called from the config handling routine, so
* better play it save. */
if ((filename == NULL) || (*filename == 0))
return (0);
fh = fopen (filename, "r");
if (fh == NULL)
{
char errbuf[1024];
WARNING ("openvpn plugin: Unable to read \"%s\": %s", filename,
sstrerror (errno, errbuf, sizeof (errbuf)));
return (0);
}
/* now search for the specific multimode data format */
while ((fgets (buffer, sizeof (buffer), fh)) != NULL)
{
/* we look at the first line searching for SINGLE mode configuration */
if (strcmp (buffer, VSSTRING) == 0)
{
DEBUG ("openvpn plugin: found status file version SINGLE");
version = SINGLE;
break;
}
/* searching for multi version 1 */
else if (strcmp (buffer, V1STRING) == 0)
{
DEBUG ("openvpn plugin: found status file version MULTI1");
version = MULTI1;
break;
}
/* searching for multi version 2 */
else if (strcmp (buffer, V2STRING) == 0)
{
DEBUG ("openvpn plugin: found status file version MULTI2");
version = MULTI2;
break;
}
/* searching for multi version 3 */
else if (strcmp (buffer, V3STRING) == 0)
{
DEBUG ("openvpn plugin: found status file version MULTI3");
version = MULTI3;
break;
}
}
if (version == 0)
{
/* This is only reached during configuration, so complaining to
* the user is in order. */
NOTICE ("openvpn plugin: %s: Unknown file format, please "
"report this as bug. Make sure to include "
"your status file, so the plugin can "
"be adapted.", filename);
}
fclose (fh);
return version;
} /* int version_detect */
static int openvpn_config (const char *key, const char *value)
{
if (strcasecmp ("StatusFile", key) == 0)
{
char *status_file, *status_name, *filename;
int status_version, i;
vpn_status_t *temp;
/* try to detect the status file format */
status_version = version_detect (value);
if (status_version == 0)
{
WARNING ("openvpn plugin: unable to detect status version, \
discarding status file \"%s\".", value);
return (1);
}
status_file = sstrdup (value);
if (status_file == NULL)
{
char errbuf[1024];
WARNING ("openvpn plugin: sstrdup failed: %s",
sstrerror (errno, errbuf, sizeof (errbuf)));
return (1);
}
/* it determines the file name as string starting at location filename + 1 */
filename = strrchr (status_file, (int) '/');
if (filename == NULL)
{
/* status_file is already the file name only */
status_name = status_file;
}
else
{
/* doesn't waste memory, uses status_file starting at filename + 1 */
status_name = filename + 1;
}
/* scan the list looking for a clone */
for (i = 0; i < vpn_num; i++)
{
if (strcasecmp (vpn_list[i]->name, status_name) == 0)
{
WARNING ("openvpn plugin: status filename \"%s\" "
"already used, please choose a "
"different one.", status_name);
sfree (status_file);
return (1);
}
}
/* create a new vpn element since file, version and name are ok */
temp = (vpn_status_t *) malloc (sizeof (vpn_status_t));
temp->file = status_file;
temp->version = status_version;
temp->name = status_name;
vpn_list = (vpn_status_t **) realloc (vpn_list, (vpn_num + 1) * sizeof (vpn_status_t *));
if (vpn_list == NULL)
{
char errbuf[1024];
ERROR ("openvpn plugin: malloc failed: %s",
sstrerror (errno, errbuf, sizeof (errbuf)));
sfree (temp->file);
sfree (temp);
return (1);
}
vpn_list[vpn_num] = temp;
vpn_num++;
DEBUG ("openvpn plugin: status file \"%s\" added", temp->file);
} /* if (strcasecmp ("StatusFile", key) == 0) */
else if ((strcasecmp ("CollectCompression", key) == 0)
|| (strcasecmp ("Compression", key) == 0)) /* old, deprecated name */
{
if (IS_FALSE (value))
collect_compression = 0;
else
collect_compression = 1;
} /* if (strcasecmp ("CollectCompression", key) == 0) */
else if (strcasecmp ("ImprovedNamingSchema", key) == 0)
{
if (IS_TRUE (value))
{
DEBUG ("openvpn plugin: using the new naming schema");
new_naming_schema = 1;
}
else
{
new_naming_schema = 0;
}
} /* if (strcasecmp ("ImprovedNamingSchema", key) == 0) */
else if (strcasecmp("CollectUserCount", key) == 0)
{
if (IS_TRUE(value))
collect_user_count = 1;
else
collect_user_count = 0;
} /* if (strcasecmp("CollectUserCount", key) == 0) */
else if (strcasecmp("CollectIndividualUsers", key) == 0)
{
if (IS_FALSE (value))
collect_individual_users = 0;
else
collect_individual_users = 1;
} /* if (strcasecmp("CollectIndividualUsers", key) == 0) */
else
{
return (-1);
}
return (0);
} /* int openvpn_config */
/* shutdown callback */
static int openvpn_shutdown (void)
{
int i;
for (i = 0; i < vpn_num; i++)
{
sfree (vpn_list[i]->file);
sfree (vpn_list[i]);
}
sfree (vpn_list);
return (0);
} /* int openvpn_shutdown */
static int openvpn_init (void)
{
if (!collect_individual_users
&& !collect_compression
&& !collect_user_count)
{
WARNING ("OpenVPN plugin: Neither `CollectIndividualUsers', "
"`CollectCompression', nor `CollectUserCount' is true. There's no "
"data left to collect.");
return (-1);
}
plugin_register_read ("openvpn", openvpn_read);
plugin_register_shutdown ("openvpn", openvpn_shutdown);
return (0);
} /* int openvpn_init */
void module_register (void)
{
plugin_register_config ("openvpn", openvpn_config,
config_keys, config_keys_num);
plugin_register_init ("openvpn", openvpn_init);
} /* void module_register */
/* vim: set sw=2 ts=2 : */