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 OWN_LIBIPTC
29 # include "libiptc/libiptc.h"
30 #else
31 # include <libiptc/libiptc.h>
32 #endif
34 /*
35 * (Module-)Global variables
36 */
38 /*
39 * Config format should be `Chain table chainname',
40 * e. g. `Chain mangle incoming'
41 */
42 static const char *config_keys[] =
43 {
44 "Chain",
45 NULL
46 };
47 static int config_keys_num = 1;
48 /*
49 Each table/chain combo that will be queried goes into this list
50 */
51 #ifndef XT_TABLE_MAXNAMELEN
52 # define XT_TABLE_MAXNAMELEN 32
53 #endif
54 typedef struct {
55 char table[XT_TABLE_MAXNAMELEN];
56 char chain[XT_TABLE_MAXNAMELEN];
57 union
58 {
59 int num;
60 char *comment;
61 } rule;
62 enum
63 {
64 RTYPE_NUM,
65 RTYPE_COMMENT,
66 RTYPE_COMMENT_ALL
67 } rule_type;
68 char name[64];
69 } ip_chain_t;
71 static ip_chain_t **chain_list = NULL;
72 static int chain_num = 0;
74 static int iptables_config (const char *key, const char *value)
75 {
76 if (strcasecmp (key, "Chain") == 0)
77 {
78 ip_chain_t temp, *final, **list;
79 char *table;
80 int table_len;
81 char *chain;
82 int chain_len;
84 char *value_copy;
85 char *fields[4];
86 int fields_num;
88 memset (&temp, 0, sizeof (temp));
90 value_copy = strdup (value);
91 if (value_copy == NULL)
92 {
93 char errbuf[1024];
94 ERROR ("strdup failed: %s",
95 sstrerror (errno, errbuf, sizeof (errbuf)));
96 return (1);
97 }
99 /* Chain <table> <chain> [<comment|num> [name]] */
100 fields_num = strsplit (value_copy, fields, 4);
101 if (fields_num < 2)
102 {
103 free (value_copy);
104 return (1);
105 }
107 table = fields[0];
108 chain = fields[1];
110 table_len = strlen (table) + 1;
111 if ((unsigned int)table_len > sizeof(temp.table))
112 {
113 ERROR ("Table `%s' too long.", table);
114 free (value_copy);
115 return (1);
116 }
117 sstrncpy (temp.table, table, table_len);
119 chain_len = strlen (chain) + 1;
120 if ((unsigned int)chain_len > sizeof(temp.chain))
121 {
122 ERROR ("Chain `%s' too long.", chain);
123 free (value_copy);
124 return (1);
125 }
126 sstrncpy (temp.chain, chain, chain_len);
128 if (fields_num >= 3)
129 {
130 char *comment = fields[2];
131 int rule = atoi (comment);
133 if (rule)
134 {
135 temp.rule.num = rule;
136 temp.rule_type = RTYPE_NUM;
137 }
138 else
139 {
140 temp.rule.comment = strdup (comment);
141 if (temp.rule.comment == NULL)
142 {
143 free (value_copy);
144 return (1);
145 }
146 temp.rule_type = RTYPE_COMMENT;
147 }
148 }
149 else
150 {
151 temp.rule_type = RTYPE_COMMENT_ALL;
152 }
154 if (fields_num >= 4)
155 sstrncpy (temp.name, fields[3], sizeof (temp.name));
157 free (value_copy);
158 value_copy = NULL;
159 table = NULL;
160 chain = NULL;
162 list = (ip_chain_t **) realloc (chain_list, (chain_num + 1) * sizeof (ip_chain_t *));
163 if (list == NULL)
164 {
165 char errbuf[1024];
166 ERROR ("realloc failed: %s",
167 sstrerror (errno, errbuf, sizeof (errbuf)));
168 return (1);
169 }
171 chain_list = list;
172 final = (ip_chain_t *) malloc( sizeof(temp) );
173 if (final == NULL)
174 {
175 char errbuf[1024];
176 ERROR ("malloc failed: %s",
177 sstrerror (errno, errbuf, sizeof (errbuf)));
178 return (1);
179 }
180 memcpy (final, &temp, sizeof (temp));
181 chain_list[chain_num] = final;
182 chain_num++;
184 DEBUG ("Chain #%i: table = %s; chain = %s;", chain_num, final->table, final->chain);
185 }
186 else
187 {
188 return (-1);
189 }
191 return (0);
192 } /* int iptables_config */
194 /* This needs to return `int' for IPT_MATCH_ITERATE to work. */
195 static int submit_match (const struct ipt_entry_match *match,
196 const struct ipt_entry *entry,
197 const ip_chain_t *chain,
198 int rule_num)
199 {
200 int status;
201 value_t values[1];
202 value_list_t vl = VALUE_LIST_INIT;
204 /* Select the rules to collect */
205 if (chain->rule_type == RTYPE_NUM)
206 {
207 if (chain->rule.num != rule_num)
208 return (0);
209 }
210 else
211 {
212 if (strcmp (match->u.user.name, "comment") != 0)
213 return (0);
214 if ((chain->rule_type == RTYPE_COMMENT)
215 && (strcmp (chain->rule.comment, (char *) match->data) != 0))
216 return (0);
217 }
219 vl.values = values;
220 vl.values_len = 1;
221 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
222 sstrncpy (vl.plugin, "iptables", sizeof (vl.plugin));
224 status = ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
225 "%s-%s", chain->table, chain->chain);
226 if ((status < 1) || ((unsigned int)status >= sizeof (vl.plugin_instance)))
227 return (0);
229 if (chain->name[0] != '\0')
230 {
231 sstrncpy (vl.type_instance, chain->name, sizeof (vl.type_instance));
232 }
233 else
234 {
235 if (chain->rule_type == RTYPE_NUM)
236 ssnprintf (vl.type_instance, sizeof (vl.type_instance),
237 "%i", chain->rule.num);
238 else
239 sstrncpy (vl.type_instance, (char *) match->data,
240 sizeof (vl.type_instance));
241 }
243 sstrncpy (vl.type, "ipt_bytes", sizeof (vl.type));
244 values[0].counter = (counter_t) entry->counters.bcnt;
245 plugin_dispatch_values (&vl);
247 sstrncpy (vl.type, "ipt_packets", sizeof (vl.type));
248 values[0].counter = (counter_t) entry->counters.pcnt;
249 plugin_dispatch_values (&vl);
251 return (0);
252 } /* void submit_match */
254 static void submit_chain( iptc_handle_t *handle, ip_chain_t *chain ) {
255 const struct ipt_entry *entry;
256 int rule_num;
258 /* Find first rule for chain and use the iterate macro */
259 entry = iptc_first_rule( chain->chain, handle );
260 if (entry == NULL)
261 {
262 DEBUG ("iptc_first_rule failed: %s", iptc_strerror (errno));
263 return;
264 }
266 rule_num = 1;
267 while (entry)
268 {
269 if (chain->rule_type == RTYPE_NUM)
270 {
271 submit_match (NULL, entry, chain, rule_num);
272 }
273 else
274 {
275 IPT_MATCH_ITERATE( entry, submit_match, entry, chain, rule_num );
276 }
278 entry = iptc_next_rule( entry, handle );
279 rule_num++;
280 } /* while (entry) */
281 }
284 static int iptables_read (void)
285 {
286 int i;
287 int num_failures = 0;
289 /* Init the iptc handle structure and query the correct table */
290 for (i = 0; i < chain_num; i++)
291 {
292 iptc_handle_t handle;
293 ip_chain_t *chain;
295 chain = chain_list[i];
296 if (!chain)
297 {
298 DEBUG ("iptables plugin: chain == NULL");
299 continue;
300 }
302 handle = iptc_init (chain->table);
303 if (!handle)
304 {
305 ERROR ("iptables plugin: iptc_init (%s) failed: %s",
306 chain->table, iptc_strerror (errno));
307 num_failures++;
308 continue;
309 }
311 submit_chain (&handle, chain);
312 iptc_free (&handle);
313 } /* for (i = 0 .. chain_num) */
315 return ((num_failures < chain_num) ? 0 : -1);
316 } /* int iptables_read */
318 static int iptables_shutdown (void)
319 {
320 int i;
322 for (i = 0; i < chain_num; i++)
323 {
324 if ((chain_list[i] != NULL) && (chain_list[i]->rule_type == RTYPE_COMMENT))
325 {
326 sfree (chain_list[i]->rule.comment);
327 }
328 sfree (chain_list[i]);
329 }
330 sfree (chain_list);
332 return (0);
333 } /* int iptables_shutdown */
335 void module_register (void)
336 {
337 plugin_register_config ("iptables", iptables_config,
338 config_keys, config_keys_num);
339 plugin_register_read ("iptables", iptables_read);
340 plugin_register_shutdown ("iptables", iptables_shutdown);
341 } /* void module_register */
343 /*
344 * vim:shiftwidth=4:softtabstop=4:tabstop=8
345 */