1 /**
2 * collectd - src/iptables.c
3 * Copyright (C) 2007 Sjoerd van der Berg
4 * Copyright (C) 2007 Florian octo Forster
5 * Copyright (C) 2009 Marco Chiappero
6 *
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.
11 *
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.
16 *
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
20 *
21 * Authors:
22 * Sjoerd van der Berg <harekiet at users.sourceforge.net>
23 * Florian Forster <octo at verplant.org>
24 * Marco Chiappero <marco at absence.it>
25 **/
27 #include "collectd.h"
28 #include "common.h"
29 #include "plugin.h"
30 #include "configfile.h"
32 #if OWN_LIBIPTC
33 # include "libiptc/libiptc.h"
34 # include "libiptc/libip6tc.h"
35 #else
36 # include <libiptc/libiptc.h>
37 # include <libiptc/libip6tc.h>
38 #endif
40 /*
41 * (Module-)Global variables
42 */
44 /*
45 * Config format should be `Chain table chainname',
46 * e. g. `Chain mangle incoming'
47 */
48 static const char *config_keys[] =
49 {
50 "Chain",
51 "Chain6"
52 };
53 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
54 /*
55 Each table/chain combo that will be queried goes into this list
56 */
58 enum protocol_version_e
59 {
60 IPV4,
61 IPV6
62 };
63 typedef enum protocol_version_e protocol_version_t;
65 #ifndef XT_TABLE_MAXNAMELEN
66 # define XT_TABLE_MAXNAMELEN 32
67 #endif
68 typedef struct {
69 protocol_version_t ip_version;
70 char table[XT_TABLE_MAXNAMELEN];
71 char chain[XT_TABLE_MAXNAMELEN];
72 union
73 {
74 int num;
75 char *comment;
76 } rule;
77 enum
78 {
79 RTYPE_NUM,
80 RTYPE_COMMENT,
81 RTYPE_COMMENT_ALL
82 } rule_type;
83 char name[64];
84 } ip_chain_t;
86 static ip_chain_t **chain_list = NULL;
87 static int chain_num = 0;
89 static int iptables_config (const char *key, const char *value)
90 {
91 /* int ip_value; */
92 protocol_version_t ip_version;
94 if (strcasecmp (key, "Chain") == 0)
95 ip_version = IPV4;
96 else if (strcasecmp (key, "Chain6") == 0)
97 ip_version = IPV6;
99 if (( ip_version == IPV4 ) || ( ip_version == IPV6 ))
100 {
101 ip_chain_t temp, *final, **list;
102 char *table;
103 int table_len;
104 char *chain;
105 int chain_len;
107 char *value_copy;
108 char *fields[4];
109 int fields_num;
111 memset (&temp, 0, sizeof (temp));
113 value_copy = strdup (value);
114 if (value_copy == NULL)
115 {
116 char errbuf[1024];
117 ERROR ("strdup failed: %s",
118 sstrerror (errno, errbuf, sizeof (errbuf)));
119 return (1);
120 }
122 /*
123 * Time to fill the temp element
124 * Examine value string, it should look like:
125 * Chain[6] <table> <chain> [<comment|num> [name]]
126 */
128 /* set IPv4 or IPv6 */
129 temp.ip_version = ip_version;
131 /* Chain <table> <chain> [<comment|num> [name]] */
132 fields_num = strsplit (value_copy, fields, 4);
133 if (fields_num < 2)
134 {
135 free (value_copy);
136 return (1);
137 }
139 table = fields[0];
140 chain = fields[1];
142 table_len = strlen (table) + 1;
143 if ((unsigned int)table_len > sizeof(temp.table))
144 {
145 ERROR ("Table `%s' too long.", table);
146 free (value_copy);
147 return (1);
148 }
149 sstrncpy (temp.table, table, table_len);
151 chain_len = strlen (chain) + 1;
152 if ((unsigned int)chain_len > sizeof(temp.chain))
153 {
154 ERROR ("Chain `%s' too long.", chain);
155 free (value_copy);
156 return (1);
157 }
158 sstrncpy (temp.chain, chain, chain_len);
160 if (fields_num >= 3)
161 {
162 char *comment = fields[2];
163 int rule = atoi (comment);
165 if (rule)
166 {
167 temp.rule.num = rule;
168 temp.rule_type = RTYPE_NUM;
169 }
170 else
171 {
172 temp.rule.comment = strdup (comment);
173 if (temp.rule.comment == NULL)
174 {
175 free (value_copy);
176 return (1);
177 }
178 temp.rule_type = RTYPE_COMMENT;
179 }
180 }
181 else
182 {
183 temp.rule_type = RTYPE_COMMENT_ALL;
184 }
186 if (fields_num >= 4)
187 sstrncpy (temp.name, fields[3], sizeof (temp.name));
189 free (value_copy);
190 value_copy = NULL;
191 table = NULL;
192 chain = NULL;
194 list = (ip_chain_t **) realloc (chain_list, (chain_num + 1) * sizeof (ip_chain_t *));
195 if (list == NULL)
196 {
197 char errbuf[1024];
198 ERROR ("realloc failed: %s",
199 sstrerror (errno, errbuf, sizeof (errbuf)));
200 return (1);
201 }
203 chain_list = list;
204 final = (ip_chain_t *) malloc( sizeof(temp) );
205 if (final == NULL)
206 {
207 char errbuf[1024];
208 ERROR ("malloc failed: %s",
209 sstrerror (errno, errbuf, sizeof (errbuf)));
210 return (1);
211 }
212 memcpy (final, &temp, sizeof (temp));
213 chain_list[chain_num] = final;
214 chain_num++;
216 DEBUG ("Chain #%i: table = %s; chain = %s;", chain_num, final->table, final->chain);
217 }
218 else
219 {
220 return (-1);
221 }
223 return (0);
224 } /* int iptables_config */
226 static int submit6_match (const struct ip6t_entry_match *match,
227 const struct ip6t_entry *entry,
228 const ip_chain_t *chain,
229 int rule_num)
230 {
231 int status;
232 value_t values[1];
233 value_list_t vl = VALUE_LIST_INIT;
235 /* Select the rules to collect */
236 if (chain->rule_type == RTYPE_NUM)
237 {
238 if (chain->rule.num != rule_num)
239 return (0);
240 }
241 else
242 {
243 if (strcmp (match->u.user.name, "comment") != 0)
244 return (0);
245 if ((chain->rule_type == RTYPE_COMMENT)
246 && (strcmp (chain->rule.comment, (char *) match->data) != 0))
247 return (0);
248 }
250 vl.values = values;
251 vl.values_len = 1;
252 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
253 sstrncpy (vl.plugin, "ip6tables", sizeof (vl.plugin));
255 status = ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
256 "%s-%s", chain->table, chain->chain);
257 if ((status < 1) || ((unsigned int)status >= sizeof (vl.plugin_instance)))
258 return (0);
260 if (chain->name[0] != '\0')
261 {
262 sstrncpy (vl.type_instance, chain->name, sizeof (vl.type_instance));
263 }
264 else
265 {
266 if (chain->rule_type == RTYPE_NUM)
267 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
268 "%i", chain->rule.num);
269 else
270 sstrncpy (vl.type_instance, (char *) match->data,
271 sizeof (vl.type_instance));
272 }
274 sstrncpy (vl.type, "ipt_bytes", sizeof (vl.type));
275 values[0].counter = (counter_t) entry->counters.bcnt;
276 plugin_dispatch_values (&vl);
278 sstrncpy (vl.type, "ipt_packets", sizeof (vl.type));
279 values[0].counter = (counter_t) entry->counters.pcnt;
280 plugin_dispatch_values (&vl);
282 return (0);
283 } /* int submit_match */
286 /* This needs to return `int' for IPT_MATCH_ITERATE to work. */
287 static int submit_match (const struct ipt_entry_match *match,
288 const struct ipt_entry *entry,
289 const ip_chain_t *chain,
290 int rule_num)
291 {
292 int status;
293 value_t values[1];
294 value_list_t vl = VALUE_LIST_INIT;
296 /* Select the rules to collect */
297 if (chain->rule_type == RTYPE_NUM)
298 {
299 if (chain->rule.num != rule_num)
300 return (0);
301 }
302 else
303 {
304 if (strcmp (match->u.user.name, "comment") != 0)
305 return (0);
306 if ((chain->rule_type == RTYPE_COMMENT)
307 && (strcmp (chain->rule.comment, (char *) match->data) != 0))
308 return (0);
309 }
311 vl.values = values;
312 vl.values_len = 1;
313 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
314 sstrncpy (vl.plugin, "iptables", sizeof (vl.plugin));
316 status = ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
317 "%s-%s", chain->table, chain->chain);
318 if ((status < 1) || ((unsigned int)status >= sizeof (vl.plugin_instance)))
319 return (0);
321 if (chain->name[0] != '\0')
322 {
323 sstrncpy (vl.type_instance, chain->name, sizeof (vl.type_instance));
324 }
325 else
326 {
327 if (chain->rule_type == RTYPE_NUM)
328 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
329 "%i", chain->rule.num);
330 else
331 sstrncpy (vl.type_instance, (char *) match->data,
332 sizeof (vl.type_instance));
333 }
335 sstrncpy (vl.type, "ipt_bytes", sizeof (vl.type));
336 values[0].counter = (counter_t) entry->counters.bcnt;
337 plugin_dispatch_values (&vl);
339 sstrncpy (vl.type, "ipt_packets", sizeof (vl.type));
340 values[0].counter = (counter_t) entry->counters.pcnt;
341 plugin_dispatch_values (&vl);
343 return (0);
344 } /* int submit_match */
347 /* ipv6 submit_chain */
348 static void submit6_chain( ip6tc_handle_t *handle, ip_chain_t *chain )
349 {
350 const struct ip6t_entry *entry;
351 int rule_num;
353 /* Find first rule for chain and use the iterate macro */
354 entry = ip6tc_first_rule( chain->chain, handle );
355 if (entry == NULL)
356 {
357 DEBUG ("ip6tc_first_rule failed: %s", ip6tc_strerror (errno));
358 return;
359 }
361 rule_num = 1;
362 while (entry)
363 {
364 if (chain->rule_type == RTYPE_NUM)
365 {
366 submit6_match (NULL, entry, chain, rule_num);
367 }
368 else
369 {
370 IP6T_MATCH_ITERATE( entry, submit6_match, entry, chain, rule_num );
371 }
373 entry = ip6tc_next_rule( entry, handle );
374 rule_num++;
375 } /* while (entry) */
376 }
379 /* ipv4 submit_chain */
380 static void submit_chain( iptc_handle_t *handle, ip_chain_t *chain )
381 {
382 const struct ipt_entry *entry;
383 int rule_num;
385 /* Find first rule for chain and use the iterate macro */
386 entry = iptc_first_rule( chain->chain, handle );
387 if (entry == NULL)
388 {
389 DEBUG ("iptc_first_rule failed: %s", iptc_strerror (errno));
390 return;
391 }
393 rule_num = 1;
394 while (entry)
395 {
396 if (chain->rule_type == RTYPE_NUM)
397 {
398 submit_match (NULL, entry, chain, rule_num);
399 }
400 else
401 {
402 IPT_MATCH_ITERATE( entry, submit_match, entry, chain, rule_num );
403 }
405 entry = iptc_next_rule( entry, handle );
406 rule_num++;
407 } /* while (entry) */
408 }
411 static int iptables_read (void)
412 {
413 int i;
414 int num_failures = 0;
415 ip_chain_t *chain;
417 /* Init the iptc handle structure and query the correct table */
418 for (i = 0; i < chain_num; i++)
419 {
420 chain = chain_list[i];
422 if (!chain)
423 {
424 DEBUG ("iptables plugin: chain == NULL");
425 continue;
426 }
428 if ( chain->ip_version == IPV4 )
429 {
430 iptc_handle_t handle;
431 handle = iptc_init (chain->table);
433 if (!handle)
434 {
435 ERROR ("iptables plugin: iptc_init (%s) failed: %s",
436 chain->table, iptc_strerror (errno));
437 num_failures++;
438 continue;
439 }
441 submit_chain (&handle, chain);
442 iptc_free (&handle);
443 }
444 else if ( chain->ip_version == IPV6 )
445 {
446 ip6tc_handle_t handle;
447 handle = ip6tc_init (chain->table);
449 if (!handle)
450 {
451 ERROR ("iptables plugin: ip6tc_init (%s) failed: %s",
452 chain->table, ip6tc_strerror (errno));
453 num_failures++;
454 continue;
455 }
457 submit6_chain (&handle, chain);
458 ip6tc_free (&handle);
459 }
460 else num_failures++;
462 } /* for (i = 0 .. chain_num) */
464 return ((num_failures < chain_num) ? 0 : -1);
465 } /* int iptables_read */
467 static int iptables_shutdown (void)
468 {
469 int i;
471 for (i = 0; i < chain_num; i++)
472 {
473 if ((chain_list[i] != NULL) && (chain_list[i]->rule_type == RTYPE_COMMENT))
474 {
475 sfree (chain_list[i]->rule.comment);
476 }
477 sfree (chain_list[i]);
478 }
479 sfree (chain_list);
481 return (0);
482 } /* int iptables_shutdown */
484 void module_register (void)
485 {
486 plugin_register_config ("iptables", iptables_config,
487 config_keys, config_keys_num);
488 plugin_register_read ("iptables", iptables_read);
489 plugin_register_shutdown ("iptables", iptables_shutdown);
490 } /* void module_register */
492 /*
493 * vim:shiftwidth=4:softtabstop=4:tabstop=8
494 */