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)
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)));
216 sfree (temp.rule.comment);
221 final = (ip_chain_t *) malloc( sizeof(temp) );
225 ERROR ("malloc failed: %s",
226 sstrerror (errno, errbuf, sizeof (errbuf)));
227 sfree (temp.rule.comment);
230 memcpy (final, &temp, sizeof (temp));
231 chain_list[chain_num] = final;
234 DEBUG ("Chain #%i: table = %s; chain = %s;", chain_num, final->table, final->chain);
237 } /* int iptables_config */
239 static int submit6_match (const struct ip6t_entry_match *match,
240 const struct ip6t_entry *entry,
241 const ip_chain_t *chain,
246 value_list_t vl = VALUE_LIST_INIT;
248 /* Select the rules to collect */
249 if (chain->rule_type == RTYPE_NUM)
251 if (chain->rule.num != rule_num)
256 if (strcmp (match->u.user.name, "comment") != 0)
258 if ((chain->rule_type == RTYPE_COMMENT)
259 && (strcmp (chain->rule.comment, (char *) match->data) != 0))
265 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
266 sstrncpy (vl.plugin, "ip6tables", sizeof (vl.plugin));
268 status = ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
269 "%s-%s", chain->table, chain->chain);
270 if ((status < 1) || ((unsigned int)status >= sizeof (vl.plugin_instance)))
273 if (chain->name[0] != '\0')
275 sstrncpy (vl.type_instance, chain->name, sizeof (vl.type_instance));
279 if (chain->rule_type == RTYPE_NUM)
280 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
281 "%i", chain->rule.num);
283 sstrncpy (vl.type_instance, (char *) match->data,
284 sizeof (vl.type_instance));
287 sstrncpy (vl.type, "ipt_bytes", sizeof (vl.type));
288 values[0].derive = (derive_t) entry->counters.bcnt;
289 plugin_dispatch_values (&vl);
291 sstrncpy (vl.type, "ipt_packets", sizeof (vl.type));
292 values[0].derive = (derive_t) entry->counters.pcnt;
293 plugin_dispatch_values (&vl);
296 } /* int submit_match */
299 /* This needs to return `int' for IPT_MATCH_ITERATE to work. */
300 static int submit_match (const struct ipt_entry_match *match,
301 const struct ipt_entry *entry,
302 const ip_chain_t *chain,
307 value_list_t vl = VALUE_LIST_INIT;
309 /* Select the rules to collect */
310 if (chain->rule_type == RTYPE_NUM)
312 if (chain->rule.num != rule_num)
317 if (strcmp (match->u.user.name, "comment") != 0)
319 if ((chain->rule_type == RTYPE_COMMENT)
320 && (strcmp (chain->rule.comment, (char *) match->data) != 0))
326 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
327 sstrncpy (vl.plugin, "iptables", sizeof (vl.plugin));
329 status = ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
330 "%s-%s", chain->table, chain->chain);
331 if ((status < 1) || ((unsigned int)status >= sizeof (vl.plugin_instance)))
334 if (chain->name[0] != '\0')
336 sstrncpy (vl.type_instance, chain->name, sizeof (vl.type_instance));
340 if (chain->rule_type == RTYPE_NUM)
341 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
342 "%i", chain->rule.num);
344 sstrncpy (vl.type_instance, (char *) match->data,
345 sizeof (vl.type_instance));
348 sstrncpy (vl.type, "ipt_bytes", sizeof (vl.type));
349 values[0].derive = (derive_t) entry->counters.bcnt;
350 plugin_dispatch_values (&vl);
352 sstrncpy (vl.type, "ipt_packets", sizeof (vl.type));
353 values[0].derive = (derive_t) entry->counters.pcnt;
354 plugin_dispatch_values (&vl);
357 } /* int submit_match */
360 /* ipv6 submit_chain */
361 static void submit6_chain( ip6tc_handle_t *handle, ip_chain_t *chain )
363 const struct ip6t_entry *entry;
366 /* Find first rule for chain and use the iterate macro */
367 entry = ip6tc_first_rule( chain->chain, handle );
370 DEBUG ("ip6tc_first_rule failed: %s", ip6tc_strerror (errno));
377 if (chain->rule_type == RTYPE_NUM)
379 submit6_match (NULL, entry, chain, rule_num);
383 IP6T_MATCH_ITERATE( entry, submit6_match, entry, chain, rule_num );
386 entry = ip6tc_next_rule( entry, handle );
388 } /* while (entry) */
392 /* ipv4 submit_chain */
393 static void submit_chain( iptc_handle_t *handle, ip_chain_t *chain )
395 const struct ipt_entry *entry;
398 /* Find first rule for chain and use the iterate macro */
399 entry = iptc_first_rule( chain->chain, handle );
402 DEBUG ("iptc_first_rule failed: %s", iptc_strerror (errno));
409 if (chain->rule_type == RTYPE_NUM)
411 submit_match (NULL, entry, chain, rule_num);
415 IPT_MATCH_ITERATE( entry, submit_match, entry, chain, rule_num );
418 entry = iptc_next_rule( entry, handle );
420 } /* while (entry) */
424 static int iptables_read (void)
427 int num_failures = 0;
430 /* Init the iptc handle structure and query the correct table */
431 for (i = 0; i < chain_num; i++)
433 chain = chain_list[i];
437 DEBUG ("iptables plugin: chain == NULL");
441 if ( chain->ip_version == IPV4 )
443 #ifdef HAVE_IPTC_HANDLE_T
444 iptc_handle_t _handle;
445 iptc_handle_t *handle = &_handle;
447 *handle = iptc_init (chain->table);
449 iptc_handle_t *handle;
450 handle = iptc_init (chain->table);
455 ERROR ("iptables plugin: iptc_init (%s) failed: %s",
456 chain->table, iptc_strerror (errno));
461 submit_chain (handle, chain);
464 else if ( chain->ip_version == IPV6 )
466 #ifdef HAVE_IP6TC_HANDLE_T
467 ip6tc_handle_t _handle;
468 ip6tc_handle_t *handle = &_handle;
470 *handle = ip6tc_init (chain->table);
472 ip6tc_handle_t *handle;
473 handle = ip6tc_init (chain->table);
478 ERROR ("iptables plugin: ip6tc_init (%s) failed: %s",
479 chain->table, ip6tc_strerror (errno));
484 submit6_chain (handle, chain);
489 } /* for (i = 0 .. chain_num) */
491 return ((num_failures < chain_num) ? 0 : -1);
492 } /* int iptables_read */
494 static int iptables_shutdown (void)
498 for (i = 0; i < chain_num; i++)
500 if ((chain_list[i] != NULL) && (chain_list[i]->rule_type == RTYPE_COMMENT))
502 sfree (chain_list[i]->rule.comment);
504 sfree (chain_list[i]);
509 } /* int iptables_shutdown */
511 void module_register (void)
513 plugin_register_config ("iptables", iptables_config,
514 config_keys, config_keys_num);
515 plugin_register_read ("iptables", iptables_read);
516 plugin_register_shutdown ("iptables", iptables_shutdown);
517 } /* void module_register */
520 * vim:shiftwidth=4:softtabstop=4:tabstop=8