2 * collectd - src/iptables.c
3 * Copyright (C) 2007 Sjoerd van der Berg
4 * Copyright (C) 2007-2010 Florian octo Forster
5 * Copyright (C) 2009 Marco Chiappero
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 * Sjoerd van der Berg <harekiet at users.sourceforge.net>
23 * Florian Forster <octo at collectd.org>
24 * Marco Chiappero <marco at absence.it>
30 #include "configfile.h"
32 #include <sys/socket.h>
34 #include <libiptc/libiptc.h>
35 #include <libiptc/libip6tc.h>
38 * iptc_handle_t was available before libiptc was officially available as a
39 * shared library. Note, that when the shared lib was introduced, the API and
40 * ABI have changed slightly:
41 * 'iptc_handle_t' used to be 'struct iptc_handle *' and most functions used
42 * 'iptc_handle_t *' as an argument. Now, most functions use 'struct
43 * iptc_handle *' (thus removing one level of pointer indirection).
45 * HAVE_IPTC_HANDLE_T is used to determine which API ought to be used. While
46 * this is somewhat hacky, I didn't find better way to solve that :-/
49 #ifndef HAVE_IPTC_HANDLE_T
50 typedef struct iptc_handle iptc_handle_t;
52 #ifndef HAVE_IP6TC_HANDLE_T
53 typedef struct ip6tc_handle ip6tc_handle_t;
57 * (Module-)Global variables
61 * Config format should be `Chain table chainname',
62 * e. g. `Chain mangle incoming'
64 static const char *config_keys[] =
69 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
71 Each table/chain combo that will be queried goes into this list
74 enum protocol_version_e
79 typedef enum protocol_version_e protocol_version_t;
81 #ifndef XT_TABLE_MAXNAMELEN
82 # define XT_TABLE_MAXNAMELEN 32
85 protocol_version_t ip_version;
86 char table[XT_TABLE_MAXNAMELEN];
87 char chain[XT_TABLE_MAXNAMELEN];
102 static ip_chain_t **chain_list = NULL;
103 static int chain_num = 0;
105 static int iptables_config (const char *key, const char *value)
108 protocol_version_t ip_version = 0;
110 if (strcasecmp (key, "Chain") == 0)
112 else if (strcasecmp (key, "Chain6") == 0)
115 if (( ip_version == IPV4 ) || ( ip_version == IPV6 ))
117 ip_chain_t temp, *final, **list;
127 memset (&temp, 0, sizeof (temp));
129 value_copy = strdup (value);
130 if (value_copy == NULL)
133 ERROR ("strdup failed: %s",
134 sstrerror (errno, errbuf, sizeof (errbuf)));
139 * Time to fill the temp element
140 * Examine value string, it should look like:
141 * Chain[6] <table> <chain> [<comment|num> [name]]
144 /* set IPv4 or IPv6 */
145 temp.ip_version = ip_version;
147 /* Chain <table> <chain> [<comment|num> [name]] */
148 fields_num = strsplit (value_copy, fields, 4);
158 table_len = strlen (table) + 1;
159 if ((unsigned int)table_len > sizeof(temp.table))
161 ERROR ("Table `%s' too long.", table);
165 sstrncpy (temp.table, table, table_len);
167 chain_len = strlen (chain) + 1;
168 if ((unsigned int)chain_len > sizeof(temp.chain))
170 ERROR ("Chain `%s' too long.", chain);
174 sstrncpy (temp.chain, chain, chain_len);
178 char *comment = fields[2];
179 int rule = atoi (comment);
183 temp.rule.num = rule;
184 temp.rule_type = RTYPE_NUM;
188 temp.rule.comment = strdup (comment);
189 if (temp.rule.comment == NULL)
194 temp.rule_type = RTYPE_COMMENT;
199 temp.rule_type = RTYPE_COMMENT_ALL;
203 sstrncpy (temp.name, fields[3], sizeof (temp.name));
210 list = (ip_chain_t **) realloc (chain_list, (chain_num + 1) * sizeof (ip_chain_t *));
214 ERROR ("realloc failed: %s",
215 sstrerror (errno, errbuf, sizeof (errbuf)));
220 final = (ip_chain_t *) malloc( sizeof(temp) );
224 ERROR ("malloc failed: %s",
225 sstrerror (errno, errbuf, sizeof (errbuf)));
228 memcpy (final, &temp, sizeof (temp));
229 chain_list[chain_num] = final;
232 DEBUG ("Chain #%i: table = %s; chain = %s;", chain_num, final->table, final->chain);
240 } /* int iptables_config */
242 static int submit6_match (const struct ip6t_entry_match *match,
243 const struct ip6t_entry *entry,
244 const ip_chain_t *chain,
249 value_list_t vl = VALUE_LIST_INIT;
251 /* Select the rules to collect */
252 if (chain->rule_type == RTYPE_NUM)
254 if (chain->rule.num != rule_num)
259 if (strcmp (match->u.user.name, "comment") != 0)
261 if ((chain->rule_type == RTYPE_COMMENT)
262 && (strcmp (chain->rule.comment, (char *) match->data) != 0))
268 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
269 sstrncpy (vl.plugin, "ip6tables", sizeof (vl.plugin));
271 status = ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
272 "%s-%s", chain->table, chain->chain);
273 if ((status < 1) || ((unsigned int)status >= sizeof (vl.plugin_instance)))
276 if (chain->name[0] != '\0')
278 sstrncpy (vl.type_instance, chain->name, sizeof (vl.type_instance));
282 if (chain->rule_type == RTYPE_NUM)
283 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
284 "%i", chain->rule.num);
286 sstrncpy (vl.type_instance, (char *) match->data,
287 sizeof (vl.type_instance));
290 sstrncpy (vl.type, "ipt_bytes", sizeof (vl.type));
291 values[0].derive = (derive_t) entry->counters.bcnt;
292 plugin_dispatch_values (&vl);
294 sstrncpy (vl.type, "ipt_packets", sizeof (vl.type));
295 values[0].derive = (derive_t) entry->counters.pcnt;
296 plugin_dispatch_values (&vl);
299 } /* int submit_match */
302 /* This needs to return `int' for IPT_MATCH_ITERATE to work. */
303 static int submit_match (const struct ipt_entry_match *match,
304 const struct ipt_entry *entry,
305 const ip_chain_t *chain,
310 value_list_t vl = VALUE_LIST_INIT;
312 /* Select the rules to collect */
313 if (chain->rule_type == RTYPE_NUM)
315 if (chain->rule.num != rule_num)
320 if (strcmp (match->u.user.name, "comment") != 0)
322 if ((chain->rule_type == RTYPE_COMMENT)
323 && (strcmp (chain->rule.comment, (char *) match->data) != 0))
329 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
330 sstrncpy (vl.plugin, "iptables", sizeof (vl.plugin));
332 status = ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
333 "%s-%s", chain->table, chain->chain);
334 if ((status < 1) || ((unsigned int)status >= sizeof (vl.plugin_instance)))
337 if (chain->name[0] != '\0')
339 sstrncpy (vl.type_instance, chain->name, sizeof (vl.type_instance));
343 if (chain->rule_type == RTYPE_NUM)
344 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
345 "%i", chain->rule.num);
347 sstrncpy (vl.type_instance, (char *) match->data,
348 sizeof (vl.type_instance));
351 sstrncpy (vl.type, "ipt_bytes", sizeof (vl.type));
352 values[0].derive = (derive_t) entry->counters.bcnt;
353 plugin_dispatch_values (&vl);
355 sstrncpy (vl.type, "ipt_packets", sizeof (vl.type));
356 values[0].derive = (derive_t) entry->counters.pcnt;
357 plugin_dispatch_values (&vl);
360 } /* int submit_match */
363 /* ipv6 submit_chain */
364 static void submit6_chain( ip6tc_handle_t *handle, ip_chain_t *chain )
366 const struct ip6t_entry *entry;
369 /* Find first rule for chain and use the iterate macro */
370 entry = ip6tc_first_rule( chain->chain, handle );
373 DEBUG ("ip6tc_first_rule failed: %s", ip6tc_strerror (errno));
380 if (chain->rule_type == RTYPE_NUM)
382 submit6_match (NULL, entry, chain, rule_num);
386 IP6T_MATCH_ITERATE( entry, submit6_match, entry, chain, rule_num );
389 entry = ip6tc_next_rule( entry, handle );
391 } /* while (entry) */
395 /* ipv4 submit_chain */
396 static void submit_chain( iptc_handle_t *handle, ip_chain_t *chain )
398 const struct ipt_entry *entry;
401 /* Find first rule for chain and use the iterate macro */
402 entry = iptc_first_rule( chain->chain, handle );
405 DEBUG ("iptc_first_rule failed: %s", iptc_strerror (errno));
412 if (chain->rule_type == RTYPE_NUM)
414 submit_match (NULL, entry, chain, rule_num);
418 IPT_MATCH_ITERATE( entry, submit_match, entry, chain, rule_num );
421 entry = iptc_next_rule( entry, handle );
423 } /* while (entry) */
427 static int iptables_read (void)
430 int num_failures = 0;
433 /* Init the iptc handle structure and query the correct table */
434 for (i = 0; i < chain_num; i++)
436 chain = chain_list[i];
440 DEBUG ("iptables plugin: chain == NULL");
444 if ( chain->ip_version == IPV4 )
446 #ifdef HAVE_IPTC_HANDLE_T
447 iptc_handle_t _handle;
448 iptc_handle_t *handle = &_handle;
450 *handle = iptc_init (chain->table);
452 iptc_handle_t *handle;
453 handle = iptc_init (chain->table);
458 ERROR ("iptables plugin: iptc_init (%s) failed: %s",
459 chain->table, iptc_strerror (errno));
464 submit_chain (handle, chain);
467 else if ( chain->ip_version == IPV6 )
469 #ifdef HAVE_IP6TC_HANDLE_T
470 ip6tc_handle_t _handle;
471 ip6tc_handle_t *handle = &_handle;
473 *handle = ip6tc_init (chain->table);
475 ip6tc_handle_t *handle;
476 handle = ip6tc_init (chain->table);
481 ERROR ("iptables plugin: ip6tc_init (%s) failed: %s",
482 chain->table, ip6tc_strerror (errno));
487 submit6_chain (handle, chain);
492 } /* for (i = 0 .. chain_num) */
494 return ((num_failures < chain_num) ? 0 : -1);
495 } /* int iptables_read */
497 static int iptables_shutdown (void)
501 for (i = 0; i < chain_num; i++)
503 if ((chain_list[i] != NULL) && (chain_list[i]->rule_type == RTYPE_COMMENT))
505 sfree (chain_list[i]->rule.comment);
507 sfree (chain_list[i]);
512 } /* int iptables_shutdown */
514 void module_register (void)
516 plugin_register_config ("iptables", iptables_config,
517 config_keys, config_keys_num);
518 plugin_register_read ("iptables", iptables_read);
519 plugin_register_shutdown ("iptables", iptables_shutdown);
520 } /* void module_register */
523 * vim:shiftwidth=4:softtabstop=4:tabstop=8