1 /**
2 * collectd - src/iptables.c
3 * Copyright (C) 2007 Sjoerd van der Berg
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Sjoerd van der Berg <harekiet at users.sourceforge.net>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "configfile.h"
28 #if HAVE_LIBIPTC_LIBIPTC_H
29 # include <libiptc/libiptc.h>
30 #endif
32 #if HAVE_LIBIPTC_LIBIPTC_H
33 # define IPTABLES_HAVE_READ 1
34 #else
35 # define IPTABLES_HAVE_READ 0
36 #endif
38 #define MODULE_NAME "iptables"
39 #define BUFSIZE 512
41 /*
42 * (Module-)Global variables
43 */
45 /*
46 * Removed packet count for now, should have config option if you want to save
47 * them Although other collectd models don't seem to care much for options
48 * eitherway for what to log
49 */
50 /* Limit to ~125MByte/s (~1GBit/s) */
51 static data_source_t dsrc[1] =
52 {
53 {"value", DS_TYPE_COUNTER, 0.0, 134217728.0}
54 };
56 static data_set_t ipt_bytes_ds =
57 {
58 "ipt_bytes", 1, dsrc
59 };
61 static data_set_t ipt_packets_ds =
62 {
63 "ipt_packets", 1, dsrc
64 };
66 #if IPTABLES_HAVE_READ
67 /*
68 * Config format should be `Chain table chainname',
69 * e. g. `Chain mangle incoming'
70 */
71 static const char *config_keys[] =
72 {
73 "Chain",
74 NULL
75 };
76 static int config_keys_num = 1;
77 /*
78 Each table/chain combo that will be queried goes into this list
79 */
80 #ifndef XT_TABLE_MAXNAMELEN
81 # define XT_TABLE_MAXNAMELEN 32
82 #endif
83 typedef struct {
84 char table[XT_TABLE_MAXNAMELEN];
85 char chain[XT_TABLE_MAXNAMELEN];
86 union
87 {
88 int num;
89 char *comment;
90 } rule;
91 enum
92 {
93 RTYPE_NUM,
94 RTYPE_COMMENT,
95 RTYPE_COMMENT_ALL
96 } rule_type;
97 char name[64];
98 } ip_chain_t;
100 static ip_chain_t **chain_list = NULL;
101 static int chain_num = 0;
103 static int iptables_config (const char *key, const char *value)
104 {
105 if (strcasecmp (key, "Chain") == 0)
106 {
107 ip_chain_t temp, *final, **list;
108 char *table;
109 int table_len;
110 char *chain;
111 int chain_len;
113 char *value_copy;
114 char *fields[4];
115 int fields_num;
117 memset (&temp, 0, sizeof (temp));
119 value_copy = strdup (value);
120 if (value_copy == NULL)
121 {
122 char errbuf[1024];
123 ERROR ("strdup failed: %s",
124 sstrerror (errno, errbuf, sizeof (errbuf)));
125 return (1);
126 }
128 /* Chain <table> <chain> [<comment|num> [name]] */
129 fields_num = strsplit (value_copy, fields, 4);
130 if (fields_num < 2)
131 {
132 free (value_copy);
133 return (1);
134 }
136 table = fields[0];
137 chain = fields[1];
139 table_len = strlen (table);
140 if (table_len >= sizeof(temp.table))
141 {
142 ERROR ("Table `%s' too long.", table);
143 free (value_copy);
144 return (1);
145 }
146 strncpy (temp.table, table, table_len);
147 temp.table[table_len] = '\0';
149 chain_len = strlen (chain);
150 if (chain_len >= sizeof(temp.chain))
151 {
152 ERROR ("Chain `%s' too long.", chain);
153 free (value_copy);
154 return (1);
155 }
156 strncpy (temp.chain, chain, chain_len);
157 temp.chain[chain_len] = '\0';
159 if (fields_num >= 3)
160 {
161 char *comment = fields[2];
162 int rule = atoi (comment);
164 if (rule)
165 {
166 temp.rule.num = rule;
167 temp.rule_type = RTYPE_NUM;
168 }
169 else
170 {
171 strncpy (temp.rule.comment, comment,
172 sizeof (temp.rule.comment) - 1);
173 temp.rule_type = RTYPE_COMMENT;
174 }
175 }
176 else
177 {
178 temp.rule_type = RTYPE_COMMENT_ALL;
179 }
181 if (fields_num >= 4)
182 strncpy (temp.name, fields[3], sizeof (temp.name) - 1);
184 free (value_copy);
185 value_copy = NULL;
186 table = NULL;
187 chain = NULL;
189 list = (ip_chain_t **) realloc (chain_list, (chain_num + 1) * sizeof (ip_chain_t *));
190 if (list == NULL)
191 {
192 char errbuf[1024];
193 ERROR ("realloc failed: %s",
194 sstrerror (errno, errbuf, sizeof (errbuf)));
195 return (1);
196 }
198 chain_list = list;
199 final = (ip_chain_t *) malloc( sizeof(temp) );
200 if (final == NULL)
201 {
202 char errbuf[1024];
203 ERROR ("malloc failed: %s",
204 sstrerror (errno, errbuf, sizeof (errbuf)));
205 return (1);
206 }
207 memcpy (final, &temp, sizeof (temp));
208 chain_list[chain_num] = final;
209 chain_num++;
211 DEBUG ("Chain #%i: table = %s; chain = %s;", chain_num, final->table, final->chain);
212 }
213 else
214 {
215 return (-1);
216 }
218 return (0);
219 } /* int iptables_config */
220 #endif /* IPTABLES_HAVE_READ */
222 #if IPTABLES_HAVE_READ
223 /* This needs to return `int' for IPT_MATCH_ITERATE to work. */
224 static int submit_match (const struct ipt_entry_match *match,
225 const struct ipt_entry *entry,
226 const ip_chain_t *chain,
227 int rule_num)
228 {
229 int status;
230 value_t values[1];
231 value_list_t vl = VALUE_LIST_INIT;
233 /* Select the rules to collect */
234 if (chain->rule_type == RTYPE_NUM)
235 {
236 if (chain->rule.num != rule_num)
237 return (0);
238 }
239 else
240 {
241 if (strcmp (match->u.user.name, "comment") != 0)
242 return (0);
243 if ((chain->rule_type == RTYPE_COMMENT)
244 && (strcmp (chain->rule.comment, (char *) match->data) != 0))
245 return (0);
246 }
248 vl.values = values;
249 vl.values_len = 1;
250 vl.time = time (NULL);
251 strcpy (vl.host, hostname_g);
252 strcpy (vl.plugin, "iptables");
254 status = snprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
255 "%s-%s", chain->table, chain->chain);
256 if ((status >= sizeof (vl.plugin_instance)) || (status < 1))
257 return (0);
259 if (chain->name[0] != '\0')
260 {
261 strncpy (vl.type_instance, chain->name, sizeof (vl.type_instance));
262 }
263 else
264 {
265 if (chain->rule_type == RTYPE_NUM)
266 snprintf (vl.type_instance, sizeof (vl.type_instance),
267 "%i", chain->rule.num);
268 else
269 strncpy (vl.type_instance, (char *) match->data,
270 sizeof (vl.type_instance));
271 }
272 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
274 values[0].counter = (counter_t) entry->counters.bcnt;
275 plugin_dispatch_values ("ipt_bytes", &vl);
277 values[0].counter = (counter_t) entry->counters.pcnt;
278 plugin_dispatch_values ("ipt_packets", &vl);
280 return (0);
281 } /* void submit_match */
283 static void submit_chain( iptc_handle_t *handle, ip_chain_t *chain ) {
284 const struct ipt_entry *entry;
285 int rule_num;
287 /* Find first rule for chain and use the iterate macro */
288 entry = iptc_first_rule( chain->chain, handle );
289 if (entry == NULL)
290 {
291 DEBUG ("iptc_first_rule failed: %s", iptc_strerror (errno));
292 return;
293 }
295 rule_num = 1;
296 while (entry)
297 {
298 if (chain->rule_type == RTYPE_NUM)
299 {
300 submit_match (NULL, entry, chain, rule_num);
301 }
302 else
303 {
304 IPT_MATCH_ITERATE( entry, submit_match, entry, chain, rule_num );
305 }
307 entry = iptc_next_rule( entry, handle );
308 rule_num++;
309 } /* while (entry) */
310 }
313 static int iptables_read (void)
314 {
315 int i;
316 static complain_t complaint;
318 /* Init the iptc handle structure and query the correct table */
319 for (i = 0; i < chain_num; i++)
320 {
321 iptc_handle_t handle;
322 ip_chain_t *chain;
324 chain = chain_list[i];
325 if (!chain)
326 {
327 DEBUG ("chain == NULL");
328 continue;
329 }
331 handle = iptc_init( chain->table );
332 if (!handle)
333 {
334 DEBUG ("iptc_init (%s) failed: %s", chain->table, iptc_strerror (errno));
335 plugin_complain (LOG_ERR, &complaint, "iptc_init (%s) failed: %s",
336 chain->table, iptc_strerror (errno));
337 continue;
338 }
339 plugin_relief (LOG_INFO, &complaint, "iptc_init (%s) succeeded",
340 chain->table);
342 submit_chain (&handle, chain);
343 iptc_free (&handle);
344 }
346 return (0);
347 } /* int iptables_read */
349 static int iptables_shutdown (void)
350 {
351 int i;
353 for (i = 0; i < chain_num; i++)
354 sfree (chain_list[i]);
355 sfree (chain_list);
357 return (0);
358 } /* int iptables_shutdown */
359 #endif /* IPTABLES_HAVE_READ */
361 void module_register (modreg_e load)
362 {
363 if (load & MR_DATASETS)
364 {
365 plugin_register_data_set (&ipt_bytes_ds);
366 plugin_register_data_set (&ipt_packets_ds);
367 }
369 #if IPTABLES_HAVE_READ
370 if (load & MR_READ)
371 {
372 plugin_register_config ("iptables", iptables_config,
373 config_keys, config_keys_num);
374 plugin_register_read ("iptables", iptables_read);
375 plugin_register_shutdown ("iptables", iptables_shutdown);
376 }
377 #endif
378 } /* void module_register */
380 #undef BUFSIZE
381 #undef MODULE_NAME
383 /*
384 * vim:shiftwidth=4:softtabstop=4:tabstop=8
385 */