2 * collectd - src/snort.c
3 * Copyright (C) 2013 Kris Nielander
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; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Kris Nielander <nielander@fox-it.com>
21 * This plugin is based on the snmp plugin by Florian octo Forster.
26 #include "plugin.h" /* plugin_register_*, plugin_dispatch_values */
27 #include "common.h" /* auxiliary functions */
34 struct metric_definition_s {
40 struct metric_definition_s *next;
42 typedef struct metric_definition_s metric_definition_t;
44 struct instance_definition_s {
47 metric_definition_t **metric_list;
51 struct instance_definition_s *next;
53 typedef struct instance_definition_s instance_definition_t;
56 static metric_definition_t *metric_head = NULL;
58 static int snort_read_submit(instance_definition_t *id, metric_definition_t *md,
61 /* Registration variables */
63 value_list_t vl = VALUE_LIST_INIT;
65 DEBUG("snort plugin: plugin_instance=%s type=%s value=%s", id->name,
72 parse_value(buf, &value, md->data_source_type);
78 sstrncpy(vl.host, hostname_g, sizeof (vl.host));
79 sstrncpy(vl.plugin, "snort", sizeof(vl.plugin));
80 sstrncpy(vl.plugin_instance, id->name, sizeof(vl.plugin_instance));
81 sstrncpy(vl.type, md->type, sizeof(vl.type));
82 if (md->instance != NULL)
83 sstrncpy(vl.type_instance, md->instance, sizeof(vl.type_instance));
86 vl.interval = id->interval;
88 DEBUG("snort plugin: -> plugin_dispatch_values (&vl);");
89 plugin_dispatch_values(&vl);
94 static int snort_read_buffer (instance_definition_t *id,
95 char const *buffer, size_t buffer_size)
104 /* mmap, char pointers */
107 /* Set the start value count. */
110 /* Set the pointer to the last line of the file and count the fields.
111 (Skip the last two characters of the buffer: `\n' and `\0') */
112 for (p_end = (buffer + buffer_size) - 2; p_end > buffer; --p_end){
115 } else if (*p_end == '\n'){
121 if (metrics_num == 1){
122 ERROR("snort plugin: last line of `%s' does not contain enough values.", id->path);
127 ERROR("snort plugin: last line of `%s' is a comment.", id->path);
131 /* Copy the line to the buffer */
134 /* Create a list of all values */
135 metrics = calloc (metrics_num, sizeof (*metrics));
136 if (metrics == NULL) {
137 ERROR ("snort plugin: calloc failed.");
144 while (buf_ptr != NULL) {
145 char *next = strchr (buf_ptr, ',');
150 metrics[i] = buf_ptr;
154 assert (i == metrics_num);
157 id->last = TIME_T_TO_CDTIME_T(strtol(*metrics, NULL, 0));
159 /* Register values */
160 for (i = 0; i < id->metric_list_len; ++i){
161 metric_definition_t *md = id->metric_list[i];
163 if (md->index >= metrics_num) {
164 ERROR ("snort plugin: Metric \"%s\": Request for index %i when "
165 "only %i fields are available.",
166 md->name, md->index, metrics_num);
170 snort_read_submit(id, md, metrics[md->index]);
173 /* Free up resources */
179 static int snort_read(user_data_t *ud){
180 instance_definition_t *id;
186 /* mmap, char pointers */
190 DEBUG("snort plugin: snort_read (instance = %s)", id->name);
192 fd = open(id->path, O_RDONLY);
194 ERROR("snort plugin: Unable to open `%s'.", id->path);
198 if ((fstat(fd, &sb) != 0) || (!S_ISREG(sb.st_mode))){
199 ERROR("snort plugin: `%s' is not a file.", id->path);
204 if (sb.st_size == 0){
205 ERROR("snort plugin: `%s' is empty.", id->path);
210 p_start = mmap(/* addr = */ NULL, sb.st_size, PROT_READ, MAP_SHARED, fd,
212 if (p_start == MAP_FAILED){
213 ERROR("snort plugin: mmap error");
218 snort_read_buffer (id, p_start, (size_t) sb.st_size);
220 /* Done with mmap and file pointer */
222 munmap(p_start, sb.st_size);
226 static void snort_metric_definition_destroy(void *arg){
227 metric_definition_t *md;
233 if (md->name != NULL)
234 DEBUG("snort plugin: Destroying metric definition `%s'.", md->name);
242 static int snort_config_add_metric_index(metric_definition_t *md, oconfig_item_t *ci){
243 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_NUMBER)){
244 WARNING("snort plugin: `Index' needs exactly one integer argument.");
248 md->index = (int)ci->values[0].value.number;
250 WARNING("snort plugin: `Index' must be higher than 0.");
258 static int snort_config_add_metric(oconfig_item_t *ci){
259 metric_definition_t *md;
260 const data_set_t *ds;
264 md = (metric_definition_t *)malloc(sizeof(*md));
267 memset(md, 0, sizeof(*md));
273 status = cf_util_get_string (ci, &md->name);
279 for (i = 0; i < ci->children_num; ++i){
280 oconfig_item_t *option = ci->children + i;
283 if (strcasecmp("Type", option->key) == 0)
284 status = cf_util_get_string(option, &md->type);
285 else if (strcasecmp("Instance", option->key) == 0)
286 status = cf_util_get_string(option, &md->instance);
287 else if (strcasecmp("Index", option->key) == 0)
288 status = snort_config_add_metric_index(md, option);
290 WARNING("snort plugin: Option `%s' not allowed here.", option->key);
299 snort_metric_definition_destroy(md);
303 /* Verify all necessary options have been set. */
304 if (md->type == NULL){
305 WARNING("snort plugin: Option `Type' must be set.");
307 } else if (md->index == 0){
308 WARNING("snort plugin: Option `Index' must be set.");
313 snort_metric_definition_destroy(md);
317 /* Retrieve the data source type from the types db. */
318 ds = plugin_get_ds(md->type);
320 ERROR ("snort plugin: Failed to look up type \"%s\". "
321 "It may not be defined in the types.db file. "
322 "Please read the types.db(5) manual page for more details.",
324 snort_metric_definition_destroy(md);
326 } else if (ds->ds_num != 1) {
327 ERROR ("snort plugin: The type \"%s\" has %i data sources. "
328 "Only types with a single data soure are supported.",
329 ds->type, ds->ds_num);
332 md->data_source_type = ds->ds->type;
335 DEBUG("snort plugin: md = { name = %s, type = %s, data_source_type = %d, index = %d }",
336 md->name, md->type, md->data_source_type, md->index);
338 if (metric_head == NULL)
341 metric_definition_t *last;
343 while (last->next != NULL)
351 static void snort_instance_definition_destroy(void *arg){
352 instance_definition_t *id;
358 if (id->name != NULL)
359 DEBUG("snort plugin: Destroying instance definition `%s'.", id->name);
363 sfree(id->metric_list);
367 static int snort_config_add_instance_collect(instance_definition_t *id, oconfig_item_t *ci){
368 metric_definition_t *metric;
371 if (ci->values_num < 1){
372 WARNING("snort plugin: The `Collect' config option needs at least one argument.");
376 /* Verify string arguments */
377 for (i = 0; i < ci->values_num; ++i)
378 if (ci->values[i].type != OCONFIG_TYPE_STRING){
379 WARNING("snort plugin: All arguments to `Collect' must be strings.");
383 id->metric_list = (metric_definition_t **)malloc(sizeof(metric_definition_t *) * ci->values_num);
384 if (id->metric_list == NULL)
387 for (i = 0; i < ci->values_num; ++i){
388 for (metric = metric_head; metric != NULL; metric = metric->next)
389 if (strcasecmp(ci->values[i].value.string, metric->name) == 0)
393 WARNING("snort plugin: `Collect' argument not found `%s'.", ci->values[i].value.string);
397 DEBUG("snort plugin: id { name=%s md->name=%s }", id->name, metric->name);
399 id->metric_list[i] = metric;
400 id->metric_list_len++;
407 static int snort_config_add_instance(oconfig_item_t *ci){
409 instance_definition_t* id;
413 /* Registration variables */
414 char cb_name[DATA_MAX_NAME_LEN];
416 struct timespec cb_interval;
418 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING)){
419 WARNING("snort plugin: The `Instance' config option needs exactly one string argument.");
423 id = (instance_definition_t *)malloc(sizeof(*id));
426 memset(id, 0, sizeof(*id));
428 id->name = strdup(ci->values[0].value.string);
429 if (id->name == NULL){
434 /* Use default interval. */
435 id->interval = plugin_get_interval();
437 for (i = 0; i < ci->children_num; ++i){
438 oconfig_item_t *option = ci->children + i;
441 if (strcasecmp("Path", option->key) == 0)
442 status = cf_util_get_string(option, &id->path);
443 else if (strcasecmp("Collect", option->key) == 0)
444 status = snort_config_add_instance_collect(id, option);
445 else if (strcasecmp("Interval", option->key) == 0)
446 cf_util_get_cdtime(option, &id->interval);
448 WARNING("snort plugin: Option `%s' not allowed here.", option->key);
457 snort_instance_definition_destroy(id);
461 /* Verify all necessary options have been set. */
462 if (id->path == NULL){
463 WARNING("snort plugin: Option `Path' must be set.");
465 } else if (id->metric_list == NULL){
466 WARNING("snort plugin: Option `Collect' must be set.");
471 snort_instance_definition_destroy(id);
475 DEBUG("snort plugin: id = { name = %s, path = %s }", id->name, id->path);
477 ssnprintf (cb_name, sizeof (cb_name), "snort-%s", id->name);
478 memset(&cb_data, 0, sizeof(cb_data));
480 cb_data.free_func = snort_instance_definition_destroy;
481 CDTIME_T_TO_TIMESPEC(id->interval, &cb_interval);
482 status = plugin_register_complex_read(NULL, cb_name, snort_read, &cb_interval, &cb_data);
485 ERROR("snort plugin: Registering complex read function failed.");
486 snort_instance_definition_destroy(id);
494 static int snort_config(oconfig_item_t *ci){
496 for (i = 0; i < ci->children_num; ++i){
497 oconfig_item_t *child = ci->children + i;
498 if (strcasecmp("Metric", child->key) == 0)
499 snort_config_add_metric(child);
500 else if (strcasecmp("Instance", child->key) == 0)
501 snort_config_add_instance(child);
503 WARNING("snort plugin: Ignore unknown config option `%s'.", child->key);
507 } /* int snort_config */
509 static int snort_shutdown(void){
510 metric_definition_t *metric_this;
511 metric_definition_t *metric_next;
513 metric_this = metric_head;
516 while (metric_this != NULL){
517 metric_next = metric_this->next;
518 snort_metric_definition_destroy(metric_this);
519 metric_this = metric_next;
525 void module_register(void){
526 plugin_register_complex_config("snort", snort_config);
527 plugin_register_shutdown("snort", snort_shutdown);