1 /**
2 * collectd - src/network.c
3 * Copyright (C) 2005-2009 Florian octo Forster
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; only version 2 of the License is applicable.
8 *
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.
13 *
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
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "plugin.h"
24 #include "common.h"
25 #include "configfile.h"
26 #include "utils_avltree.h"
28 #include "network.h"
30 #if HAVE_PTHREAD_H
31 # include <pthread.h>
32 #endif
33 #if HAVE_SYS_SOCKET_H
34 # include <sys/socket.h>
35 #endif
36 #if HAVE_NETDB_H
37 # include <netdb.h>
38 #endif
39 #if HAVE_NETINET_IN_H
40 # include <netinet/in.h>
41 #endif
42 #if HAVE_ARPA_INET_H
43 # include <arpa/inet.h>
44 #endif
45 #if HAVE_POLL_H
46 # include <poll.h>
47 #endif
49 #if HAVE_GCRYPT_H
50 # include <gcrypt.h>
51 #endif
53 /* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */
54 /* #define BUFF_SIZE 1452 */
56 #ifndef IPV6_ADD_MEMBERSHIP
57 # ifdef IPV6_JOIN_GROUP
58 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
59 # else
60 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
61 # endif
62 #endif /* !IP_ADD_MEMBERSHIP */
64 /* Buffer size to allocate. */
65 #define BUFF_SIZE 1024
67 /*
68 * Maximum size required for encryption / signing:
69 * Type/length: 4
70 * IV 16
71 * Hash/orig length: 22
72 * Padding (up to): 15
73 * --------------------
74 * 57
75 */
76 #define BUFF_SIG_SIZE 57
78 /*
79 * Private data types
80 */
81 typedef struct sockent
82 {
83 int fd;
84 struct sockaddr_storage *addr;
85 socklen_t addrlen;
87 #define SECURITY_LEVEL_NONE 0
88 #if HAVE_GCRYPT_H
89 # define SECURITY_LEVEL_SIGN 1
90 # define SECURITY_LEVEL_ENCRYPT 2
91 int security_level;
92 char *shared_secret;
93 unsigned char shared_secret_hash[32];
94 gcry_cipher_hd_t cypher;
95 #endif /* HAVE_GCRYPT_H */
97 struct sockent *next;
98 } sockent_t;
100 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
101 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
102 * +-------+-----------------------+-------------------------------+
103 * ! Ver. ! ! Length !
104 * +-------+-----------------------+-------------------------------+
105 */
106 struct part_header_s
107 {
108 uint16_t type;
109 uint16_t length;
110 };
111 typedef struct part_header_s part_header_t;
113 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
114 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
115 * +-------------------------------+-------------------------------+
116 * ! Type ! Length !
117 * +-------------------------------+-------------------------------+
118 * : (Length - 4) Bytes :
119 * +---------------------------------------------------------------+
120 */
121 struct part_string_s
122 {
123 part_header_t *head;
124 char *value;
125 };
126 typedef struct part_string_s part_string_t;
128 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
129 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
130 * +-------------------------------+-------------------------------+
131 * ! Type ! Length !
132 * +-------------------------------+-------------------------------+
133 * : (Length - 4 == 2 || 4 || 8) Bytes :
134 * +---------------------------------------------------------------+
135 */
136 struct part_number_s
137 {
138 part_header_t *head;
139 uint64_t *value;
140 };
141 typedef struct part_number_s part_number_t;
143 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
144 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
145 * +-------------------------------+-------------------------------+
146 * ! Type ! Length !
147 * +-------------------------------+---------------+---------------+
148 * ! Num of values ! Type0 ! Type1 !
149 * +-------------------------------+---------------+---------------+
150 * ! Value0 !
151 * ! !
152 * +---------------------------------------------------------------+
153 * ! Value1 !
154 * ! !
155 * +---------------------------------------------------------------+
156 */
157 struct part_values_s
158 {
159 part_header_t *head;
160 uint16_t *num_values;
161 uint8_t *values_types;
162 value_t *values;
163 };
164 typedef struct part_values_s part_values_t;
166 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
167 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
168 * +-------------------------------+-------------------------------+
169 * ! Type ! Length !
170 * +-------------------------------+-------------------------------+
171 * ! Hash (Bits 0 - 31) !
172 * : : :
173 * ! Hash (Bits 224 - 255) !
174 * +---------------------------------------------------------------+
175 */
176 struct part_signature_sha256_s
177 {
178 part_header_t head;
179 unsigned char hash[32];
180 };
181 typedef struct part_signature_sha256_s part_signature_sha256_t;
183 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
184 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
185 * +-------------------------------+-------------------------------+
186 * ! Type ! Length !
187 * +-------------------------------+-------------------------------+
188 * ! Original length ! Padding (0 - 15 bytes) !
189 * +-------------------------------+-------------------------------+
190 * ! Hash (Bits 0 - 31) !
191 * : : :
192 * ! Hash (Bits 128 - 159) !
193 * +---------------------------------------------------------------+
194 */
195 /* Size without padding */
196 #define PART_ENCRYPTION_AES256_SIZE 42
197 #define PART_ENCRYPTION_AES256_UNENCR_SIZE 20
198 struct part_encryption_aes256_s
199 {
200 part_header_t head;
201 unsigned char iv[16];
202 uint16_t orig_length;
203 unsigned char hash[20];
204 unsigned char padding[15];
205 };
206 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
208 struct receive_list_entry_s
209 {
210 char data[BUFF_SIZE];
211 int data_len;
212 int fd;
213 struct receive_list_entry_s *next;
214 };
215 typedef struct receive_list_entry_s receive_list_entry_t;
217 /*
218 * Private variables
219 */
220 static int network_config_ttl = 0;
221 static int network_config_forward = 0;
223 static sockent_t *sending_sockets = NULL;
225 static receive_list_entry_t *receive_list_head = NULL;
226 static receive_list_entry_t *receive_list_tail = NULL;
227 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
228 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
230 static sockent_t *listen_sockets = NULL;
231 static struct pollfd *listen_sockets_pollfd = NULL;
232 static int listen_sockets_num = 0;
234 /* The receive and dispatch threads will run as long as `listen_loop' is set to
235 * zero. */
236 static int listen_loop = 0;
237 static int receive_thread_running = 0;
238 static pthread_t receive_thread_id;
239 static int dispatch_thread_running = 0;
240 static pthread_t dispatch_thread_id;
242 /* Buffer in which to-be-sent network packets are constructed. */
243 static char send_buffer[BUFF_SIZE];
244 static char *send_buffer_ptr;
245 static int send_buffer_fill;
246 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
247 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
249 /* In this cache we store all the values we received, so we can send out only
250 * those values which were *not* received via the network plugin, too. This is
251 * used for the `Forward false' option. */
252 static c_avl_tree_t *cache_tree = NULL;
253 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
254 static time_t cache_flush_last = 0;
255 static int cache_flush_interval = 1800;
257 /*
258 * Private functions
259 */
260 static int cache_flush (void)
261 {
262 char **keys = NULL;
263 int keys_num = 0;
265 char **tmp;
266 int i;
268 char *key;
269 time_t *value;
270 c_avl_iterator_t *iter;
272 time_t curtime = time (NULL);
274 iter = c_avl_get_iterator (cache_tree);
275 while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
276 {
277 if ((curtime - *value) <= cache_flush_interval)
278 continue;
279 tmp = (char **) realloc (keys,
280 (keys_num + 1) * sizeof (char *));
281 if (tmp == NULL)
282 {
283 sfree (keys);
284 c_avl_iterator_destroy (iter);
285 ERROR ("network plugin: cache_flush: realloc"
286 " failed.");
287 return (-1);
288 }
289 keys = tmp;
290 keys[keys_num] = key;
291 keys_num++;
292 } /* while (c_avl_iterator_next) */
293 c_avl_iterator_destroy (iter);
295 for (i = 0; i < keys_num; i++)
296 {
297 if (c_avl_remove (cache_tree, keys[i], (void *) &key,
298 (void *) &value) != 0)
299 {
300 WARNING ("network plugin: cache_flush: c_avl_remove"
301 " (%s) failed.", keys[i]);
302 continue;
303 }
305 sfree (key);
306 sfree (value);
307 }
309 sfree (keys);
311 DEBUG ("network plugin: cache_flush: Removed %i %s",
312 keys_num, (keys_num == 1) ? "entry" : "entries");
313 cache_flush_last = curtime;
314 return (0);
315 } /* int cache_flush */
317 static int cache_check (const value_list_t *vl)
318 {
319 char key[1024];
320 time_t *value = NULL;
321 int retval = -1;
323 if (cache_tree == NULL)
324 return (-1);
326 if (format_name (key, sizeof (key), vl->host, vl->plugin,
327 vl->plugin_instance, vl->type, vl->type_instance))
328 return (-1);
330 pthread_mutex_lock (&cache_lock);
332 if (c_avl_get (cache_tree, key, (void *) &value) == 0)
333 {
334 if (*value < vl->time)
335 {
336 *value = vl->time;
337 retval = 0;
338 }
339 else
340 {
341 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
342 (int) *value, (int) vl->time);
343 retval = 1;
344 }
345 }
346 else
347 {
348 char *key_copy = strdup (key);
349 value = malloc (sizeof (time_t));
350 if ((key_copy != NULL) && (value != NULL))
351 {
352 *value = vl->time;
353 c_avl_insert (cache_tree, key_copy, value);
354 retval = 0;
355 }
356 else
357 {
358 sfree (key_copy);
359 sfree (value);
360 }
361 }
363 if ((time (NULL) - cache_flush_last) > cache_flush_interval)
364 cache_flush ();
366 pthread_mutex_unlock (&cache_lock);
368 return (retval);
369 } /* int cache_check */
371 #if HAVE_GCRYPT_H
372 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
373 const void *iv, size_t iv_size)
374 {
375 gcry_error_t err;
377 if (se->cypher == NULL)
378 {
379 err = gcry_cipher_open (&se->cypher,
380 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC, /* flags = */ 0);
381 if (err != 0)
382 {
383 ERROR ("network plugin: gcry_cipher_open returned: %s",
384 gcry_strerror (err));
385 se->cypher = NULL;
386 return (NULL);
387 }
388 }
389 else
390 {
391 gcry_cipher_reset (se->cypher);
392 }
393 assert (se->cypher != NULL);
395 err = gcry_cipher_setkey (se->cypher,
396 se->shared_secret_hash, sizeof (se->shared_secret_hash));
397 if (err != 0)
398 {
399 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
400 gcry_strerror (err));
401 gcry_cipher_close (se->cypher);
402 se->cypher = NULL;
403 return (NULL);
404 }
406 err = gcry_cipher_setiv (se->cypher, iv, iv_size);
407 if (err != 0)
408 {
409 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
410 gcry_strerror (err));
411 gcry_cipher_close (se->cypher);
412 se->cypher = NULL;
413 return (NULL);
414 }
416 return (se->cypher);
417 } /* }}} int network_get_aes256_cypher */
418 #endif /* HAVE_GCRYPT_H */
420 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
421 const data_set_t *ds, const value_list_t *vl)
422 {
423 char *packet_ptr;
424 int packet_len;
425 int num_values;
427 part_header_t pkg_ph;
428 uint16_t pkg_num_values;
429 uint8_t *pkg_values_types;
430 value_t *pkg_values;
432 int offset;
433 int i;
435 num_values = vl->values_len;
436 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
437 + (num_values * sizeof (uint8_t))
438 + (num_values * sizeof (value_t));
440 if (*ret_buffer_len < packet_len)
441 return (-1);
443 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
444 if (pkg_values_types == NULL)
445 {
446 ERROR ("network plugin: write_part_values: malloc failed.");
447 return (-1);
448 }
450 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
451 if (pkg_values == NULL)
452 {
453 free (pkg_values_types);
454 ERROR ("network plugin: write_part_values: malloc failed.");
455 return (-1);
456 }
458 pkg_ph.type = htons (TYPE_VALUES);
459 pkg_ph.length = htons (packet_len);
461 pkg_num_values = htons ((uint16_t) vl->values_len);
463 for (i = 0; i < num_values; i++)
464 {
465 if (ds->ds[i].type == DS_TYPE_COUNTER)
466 {
467 pkg_values_types[i] = DS_TYPE_COUNTER;
468 pkg_values[i].counter = htonll (vl->values[i].counter);
469 }
470 else
471 {
472 pkg_values_types[i] = DS_TYPE_GAUGE;
473 pkg_values[i].gauge = htond (vl->values[i].gauge);
474 }
475 }
477 /*
478 * Use `memcpy' to write everything to the buffer, because the pointer
479 * may be unaligned and some architectures, such as SPARC, can't handle
480 * that.
481 */
482 packet_ptr = *ret_buffer;
483 offset = 0;
484 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
485 offset += sizeof (pkg_ph);
486 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
487 offset += sizeof (pkg_num_values);
488 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
489 offset += num_values * sizeof (uint8_t);
490 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
491 offset += num_values * sizeof (value_t);
493 assert (offset == packet_len);
495 *ret_buffer = packet_ptr + packet_len;
496 *ret_buffer_len -= packet_len;
498 free (pkg_values_types);
499 free (pkg_values);
501 return (0);
502 } /* int write_part_values */
504 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
505 int type, uint64_t value)
506 {
507 char *packet_ptr;
508 int packet_len;
510 part_header_t pkg_head;
511 uint64_t pkg_value;
513 int offset;
515 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
517 if (*ret_buffer_len < packet_len)
518 return (-1);
520 pkg_head.type = htons (type);
521 pkg_head.length = htons (packet_len);
522 pkg_value = htonll (value);
524 packet_ptr = *ret_buffer;
525 offset = 0;
526 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
527 offset += sizeof (pkg_head);
528 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
529 offset += sizeof (pkg_value);
531 assert (offset == packet_len);
533 *ret_buffer = packet_ptr + packet_len;
534 *ret_buffer_len -= packet_len;
536 return (0);
537 } /* int write_part_number */
539 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
540 int type, const char *str, int str_len)
541 {
542 char *buffer;
543 int buffer_len;
545 uint16_t pkg_type;
546 uint16_t pkg_length;
548 int offset;
550 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
551 if (*ret_buffer_len < buffer_len)
552 return (-1);
554 pkg_type = htons (type);
555 pkg_length = htons (buffer_len);
557 buffer = *ret_buffer;
558 offset = 0;
559 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
560 offset += sizeof (pkg_type);
561 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
562 offset += sizeof (pkg_length);
563 memcpy (buffer + offset, str, str_len);
564 offset += str_len;
565 memset (buffer + offset, '\0', 1);
566 offset += 1;
568 assert (offset == buffer_len);
570 *ret_buffer = buffer + buffer_len;
571 *ret_buffer_len -= buffer_len;
573 return (0);
574 } /* int write_part_string */
576 static int parse_part_values (void **ret_buffer, int *ret_buffer_len,
577 value_t **ret_values, int *ret_num_values)
578 {
579 char *buffer = *ret_buffer;
580 int buffer_len = *ret_buffer_len;
582 uint16_t tmp16;
583 size_t exp_size;
584 int i;
586 uint16_t pkg_length;
587 uint16_t pkg_type;
588 uint16_t pkg_numval;
590 uint8_t *pkg_types;
591 value_t *pkg_values;
593 if (buffer_len < (15))
594 {
595 DEBUG ("network plugin: packet is too short: buffer_len = %i",
596 buffer_len);
597 return (-1);
598 }
600 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
601 buffer += sizeof (tmp16);
602 pkg_type = ntohs (tmp16);
604 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
605 buffer += sizeof (tmp16);
606 pkg_length = ntohs (tmp16);
608 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
609 buffer += sizeof (tmp16);
610 pkg_numval = ntohs (tmp16);
612 assert (pkg_type == TYPE_VALUES);
614 exp_size = 3 * sizeof (uint16_t)
615 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
616 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
617 {
618 WARNING ("network plugin: parse_part_values: "
619 "Packet too short: "
620 "Chunk of size %u expected, "
621 "but buffer has only %i bytes left.",
622 (unsigned int) exp_size, buffer_len);
623 return (-1);
624 }
626 if (pkg_length != exp_size)
627 {
628 WARNING ("network plugin: parse_part_values: "
629 "Length and number of values "
630 "in the packet don't match.");
631 return (-1);
632 }
634 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
635 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
636 if ((pkg_types == NULL) || (pkg_values == NULL))
637 {
638 sfree (pkg_types);
639 sfree (pkg_values);
640 ERROR ("network plugin: parse_part_values: malloc failed.");
641 return (-1);
642 }
644 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
645 buffer += pkg_numval * sizeof (uint8_t);
646 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
647 buffer += pkg_numval * sizeof (value_t);
649 for (i = 0; i < pkg_numval; i++)
650 {
651 if (pkg_types[i] == DS_TYPE_COUNTER)
652 pkg_values[i].counter = ntohll (pkg_values[i].counter);
653 else if (pkg_types[i] == DS_TYPE_GAUGE)
654 pkg_values[i].gauge = ntohd (pkg_values[i].gauge);
655 }
657 *ret_buffer = buffer;
658 *ret_buffer_len = buffer_len - pkg_length;
659 *ret_num_values = pkg_numval;
660 *ret_values = pkg_values;
662 sfree (pkg_types);
664 return (0);
665 } /* int parse_part_values */
667 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
668 uint64_t *value)
669 {
670 char *buffer = *ret_buffer;
671 int buffer_len = *ret_buffer_len;
673 uint16_t tmp16;
674 uint64_t tmp64;
675 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
677 uint16_t pkg_length;
678 uint16_t pkg_type;
680 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
681 {
682 WARNING ("network plugin: parse_part_number: "
683 "Packet too short: "
684 "Chunk of size %u expected, "
685 "but buffer has only %i bytes left.",
686 (unsigned int) exp_size, buffer_len);
687 return (-1);
688 }
690 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
691 buffer += sizeof (tmp16);
692 pkg_type = ntohs (tmp16);
694 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
695 buffer += sizeof (tmp16);
696 pkg_length = ntohs (tmp16);
698 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
699 buffer += sizeof (tmp64);
700 *value = ntohll (tmp64);
702 *ret_buffer = buffer;
703 *ret_buffer_len = buffer_len - pkg_length;
705 return (0);
706 } /* int parse_part_number */
708 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
709 char *output, int output_len)
710 {
711 char *buffer = *ret_buffer;
712 int buffer_len = *ret_buffer_len;
714 uint16_t tmp16;
715 size_t header_size = 2 * sizeof (uint16_t);
717 uint16_t pkg_length;
718 uint16_t pkg_type;
720 if ((buffer_len < 0) || ((size_t) buffer_len < header_size))
721 {
722 WARNING ("network plugin: parse_part_string: "
723 "Packet too short: "
724 "Chunk of at least size %u expected, "
725 "but buffer has only %i bytes left.",
726 (unsigned int) header_size, buffer_len);
727 return (-1);
728 }
730 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
731 buffer += sizeof (tmp16);
732 pkg_type = ntohs (tmp16);
734 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
735 buffer += sizeof (tmp16);
736 pkg_length = ntohs (tmp16);
738 /* Check that packet fits in the input buffer */
739 if (pkg_length > buffer_len)
740 {
741 WARNING ("network plugin: parse_part_string: "
742 "Packet too big: "
743 "Chunk of size %hu received, "
744 "but buffer has only %i bytes left.",
745 pkg_length, buffer_len);
746 return (-1);
747 }
749 /* Check that pkg_length is in the valid range */
750 if (pkg_length <= header_size)
751 {
752 WARNING ("network plugin: parse_part_string: "
753 "Packet too short: "
754 "Header claims this packet is only %hu "
755 "bytes long.", pkg_length);
756 return (-1);
757 }
759 /* Check that the package data fits into the output buffer.
760 * The previous if-statement ensures that:
761 * `pkg_length > header_size' */
762 if ((output_len < 0)
763 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
764 {
765 WARNING ("network plugin: parse_part_string: "
766 "Output buffer too small.");
767 return (-1);
768 }
770 /* All sanity checks successfull, let's copy the data over */
771 output_len = pkg_length - header_size;
772 memcpy ((void *) output, (void *) buffer, output_len);
773 buffer += output_len;
775 /* For some very weird reason '\0' doesn't do the trick on SPARC in
776 * this statement. */
777 if (output[output_len - 1] != 0)
778 {
779 WARNING ("network plugin: parse_part_string: "
780 "Received string does not end "
781 "with a NULL-byte.");
782 return (-1);
783 }
785 *ret_buffer = buffer;
786 *ret_buffer_len = buffer_len - pkg_length;
788 return (0);
789 } /* int parse_part_string */
791 #if HAVE_GCRYPT_H
792 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
793 void **ret_buffer, int *ret_buffer_len)
794 {
795 char *buffer = *ret_buffer;
796 size_t buffer_len = (size_t) *ret_buffer_len;
798 part_signature_sha256_t ps_received;
799 char hash[sizeof (ps_received.hash)];
801 gcry_md_hd_t hd;
802 gcry_error_t err;
803 unsigned char *hash_ptr;
805 if (se->shared_secret == NULL)
806 {
807 NOTICE ("network plugin: Received signed network packet but can't verify "
808 "it because no shared secret has been configured. Will accept it.");
809 return (0);
810 }
812 if (buffer_len < sizeof (ps_received))
813 return (-ENOMEM);
815 hd = NULL;
816 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
817 if (err != 0)
818 {
819 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
820 gcry_strerror (err));
821 return (-1);
822 }
824 err = gcry_md_setkey (hd, se->shared_secret,
825 strlen (se->shared_secret));
826 if (err != 0)
827 {
828 ERROR ("network plugin: gcry_md_setkey failed: %s",
829 gcry_strerror (err));
830 gcry_md_close (hd);
831 return (-1);
832 }
834 memcpy (&ps_received, buffer, sizeof (ps_received));
835 /* TODO: Check ps_received.head.length! */
837 buffer += sizeof (ps_received);
838 buffer_len -= sizeof (ps_received);
840 gcry_md_write (hd, buffer, buffer_len);
841 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
842 if (hash_ptr == NULL)
843 {
844 ERROR ("network plugin: gcry_md_read failed.");
845 gcry_md_close (hd);
846 return (-1);
847 }
848 memcpy (hash, hash_ptr, sizeof (hash));
850 gcry_md_close (hd);
851 hd = NULL;
853 *ret_buffer += sizeof (ps_received);
854 *ret_buffer_len -= sizeof (ps_received);
856 if (memcmp (ps_received.hash, hash,
857 sizeof (ps_received.hash)) == 0)
858 return (0);
859 else /* hashes do not match. */
860 return (1);
861 } /* }}} int parse_part_sign_sha256 */
862 /* #endif HAVE_GCRYPT_H */
864 #else /* if !HAVE_GCRYPT_H */
865 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
866 void **ret_buffer, int *ret_buffer_len)
867 {
868 INFO ("network plugin: Received signed packet, but the network "
869 "plugin was not linked with libgcrypt, so I cannot "
870 "verify the signature. The packet will be accepted.");
871 return (0);
872 } /* }}} int parse_part_sign_sha256 */
873 #endif /* !HAVE_GCRYPT_H */
875 #if HAVE_GCRYPT_H
876 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
877 void **ret_buffer, int *ret_buffer_len)
878 {
879 char *buffer = *ret_buffer;
880 size_t buffer_len = (size_t) *ret_buffer_len;
881 size_t orig_buffer_len;
882 size_t part_size;
883 size_t buffer_offset;
884 size_t padding_size;
885 part_encryption_aes256_t pea;
886 unsigned char hash[sizeof (pea.hash)];
888 gcry_cipher_hd_t cypher;
889 gcry_error_t err;
891 /* Make sure at least the header if available. */
892 if (buffer_len < sizeof (pea))
893 {
894 NOTICE ("network plugin: parse_part_encr_aes256: "
895 "Discarding short packet.");
896 return (-1);
897 }
899 buffer_offset = 0;
901 #define BUFFER_READ(p,s) do { \
902 memcpy ((p), buffer + buffer_offset, (s)); \
903 buffer_offset += (s); \
904 } while (0)
906 /* Copy the unencrypted information into `pea'. */
907 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
908 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
909 BUFFER_READ (pea.iv, sizeof (pea.iv));
911 /* Check the `part size'. */
912 part_size = ntohs (pea.head.length);
913 if (part_size > buffer_len)
914 {
915 NOTICE ("network plugin: parse_part_encr_aes256: "
916 "Discarding large part.");
917 return (-1);
918 }
920 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv));
921 if (cypher == NULL)
922 return (-1);
924 /* Decrypt the packet in-place */
925 err = gcry_cipher_decrypt (cypher,
926 buffer + PART_ENCRYPTION_AES256_UNENCR_SIZE,
927 part_size - PART_ENCRYPTION_AES256_UNENCR_SIZE,
928 /* in = */ NULL, /* in len = */ 0);
929 if (err != 0)
930 {
931 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
932 gcry_strerror (err));
933 return (-1);
934 }
936 /* Figure out the length of the payload and the length of the padding. */
937 BUFFER_READ (&pea.orig_length, sizeof (pea.orig_length));
939 orig_buffer_len = ntohs (pea.orig_length);
940 if (orig_buffer_len > (part_size - PART_ENCRYPTION_AES256_SIZE))
941 {
942 ERROR ("network plugin: Decryption failed: Invalid original length.");
943 return (-1);
944 }
946 /* Calculate the size of the `padding' field. */
947 padding_size = part_size - (orig_buffer_len + PART_ENCRYPTION_AES256_SIZE);
948 if (padding_size > sizeof (pea.padding))
949 {
950 ERROR ("network plugin: Part- and original length "
951 "differ more than %zu bytes.", sizeof (pea.padding));
952 return (-1);
953 }
955 BUFFER_READ (pea.hash, sizeof (pea.hash));
957 /* Read the padding. */
958 BUFFER_READ (pea.padding, padding_size);
960 /* Check hash sum */
961 memset (hash, 0, sizeof (hash));
962 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
963 buffer + buffer_offset, orig_buffer_len);
965 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
966 {
967 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
968 return (-1);
969 }
971 assert ((buffer_offset + orig_buffer_len) <= buffer_len);
972 if ((buffer_offset + orig_buffer_len) < buffer_len)
973 {
974 NOTICE ("network plugin: Trailing, potentially unencrypted data "
975 "(%zu bytes) will be ignored.",
976 buffer_len - (buffer_offset + orig_buffer_len));
977 }
979 /* Update return values */
980 *ret_buffer = buffer + buffer_offset;
981 *ret_buffer_len = (int) orig_buffer_len;
983 return (0);
984 #undef BUFFER_READ
985 } /* }}} int parse_part_encr_aes256 */
986 /* #endif HAVE_GCRYPT_H */
988 #else /* if !HAVE_GCRYPT_H */
989 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
990 void **ret_buffer, int *ret_buffer_len)
991 {
992 INFO ("network plugin: Received encrypted packet, but the network "
993 "plugin was not linked with libgcrypt, so I cannot "
994 "decrypt it. The packet will be discarded.");
995 return (-1);
996 } /* }}} int parse_part_encr_aes256 */
997 #endif /* !HAVE_GCRYPT_H */
999 static int parse_packet (receive_list_entry_t *rle) /* {{{ */
1000 {
1001 int status;
1003 void *buffer;
1004 int buffer_len;
1005 sockent_t *se;
1007 value_list_t vl = VALUE_LIST_INIT;
1008 notification_t n;
1010 int packet_was_encrypted = 0;
1011 int packet_was_signed = 0;
1012 #if HAVE_GCRYPT_H
1013 int printed_ignore_warning = 0;
1014 #endif /* HAVE_GCRYPT_H */
1016 buffer = rle->data;
1017 buffer_len = rle->data_len;
1019 /* Look for the correct `sockent_t' */
1020 se = listen_sockets;
1021 while ((se != NULL) && (se->fd != rle->fd))
1022 se = se->next;
1024 if (se == NULL)
1025 {
1026 ERROR ("network plugin: Got packet from FD %i, but can't "
1027 "find an appropriate socket entry.",
1028 rle->fd);
1029 return (-1);
1030 }
1032 memset (&vl, '\0', sizeof (vl));
1033 memset (&n, '\0', sizeof (n));
1034 status = 0;
1036 while ((status == 0) && (0 < buffer_len)
1037 && ((unsigned int) buffer_len > sizeof (part_header_t)))
1038 {
1039 uint16_t pkg_length;
1040 uint16_t pkg_type;
1042 memcpy ((void *) &pkg_type,
1043 (void *) buffer,
1044 sizeof (pkg_type));
1045 memcpy ((void *) &pkg_length,
1046 (void *) (buffer + sizeof (pkg_type)),
1047 sizeof (pkg_length));
1049 pkg_length = ntohs (pkg_length);
1050 pkg_type = ntohs (pkg_type);
1052 if (pkg_length > buffer_len)
1053 break;
1054 /* Ensure that this loop terminates eventually */
1055 if (pkg_length < (2 * sizeof (uint16_t)))
1056 break;
1058 if (pkg_type == TYPE_ENCR_AES256)
1059 {
1060 status = parse_part_encr_aes256 (se, &buffer, &buffer_len);
1061 if (status != 0)
1062 {
1063 ERROR ("network plugin: Decrypting AES256 "
1064 "part failed "
1065 "with status %i.", status);
1066 break;
1067 }
1068 else
1069 {
1070 packet_was_encrypted = 1;
1071 }
1072 }
1073 #if HAVE_GCRYPT_H
1074 else if ((se->security_level == SECURITY_LEVEL_ENCRYPT)
1075 && (packet_was_encrypted == 0))
1076 {
1077 if (printed_ignore_warning == 0)
1078 {
1079 INFO ("network plugin: Unencrypted packet or "
1080 "part has been ignored.");
1081 printed_ignore_warning = 1;
1082 }
1083 buffer = ((char *) buffer) + pkg_length;
1084 continue;
1085 }
1086 #endif /* HAVE_GCRYPT_H */
1087 else if (pkg_type == TYPE_SIGN_SHA256)
1088 {
1089 status = parse_part_sign_sha256 (se, &buffer, &buffer_len);
1090 if (status < 0)
1091 {
1092 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1093 "signature failed "
1094 "with status %i.", status);
1095 break;
1096 }
1097 else if (status > 0)
1098 {
1099 ERROR ("network plugin: Ignoring packet with "
1100 "invalid HMAC-SHA-256 signature.");
1101 break;
1102 }
1103 else
1104 {
1105 packet_was_signed = 1;
1106 }
1107 }
1108 #if HAVE_GCRYPT_H
1109 else if ((se->security_level == SECURITY_LEVEL_SIGN)
1110 && (packet_was_encrypted == 0)
1111 && (packet_was_signed == 0))
1112 {
1113 if (printed_ignore_warning == 0)
1114 {
1115 INFO ("network plugin: Unsigned packet or "
1116 "part has been ignored.");
1117 printed_ignore_warning = 1;
1118 }
1119 buffer = ((char *) buffer) + pkg_length;
1120 continue;
1121 }
1122 #endif /* HAVE_GCRYPT_H */
1123 else if (pkg_type == TYPE_VALUES)
1124 {
1125 status = parse_part_values (&buffer, &buffer_len,
1126 &vl.values, &vl.values_len);
1128 if (status != 0)
1129 break;
1131 if ((vl.time > 0)
1132 && (strlen (vl.host) > 0)
1133 && (strlen (vl.plugin) > 0)
1134 && (strlen (vl.type) > 0)
1135 && (cache_check (&vl) == 0))
1136 {
1137 plugin_dispatch_values (&vl);
1138 }
1139 else
1140 {
1141 DEBUG ("network plugin: parse_packet:"
1142 " NOT dispatching values");
1143 }
1145 sfree (vl.values);
1146 }
1147 else if (pkg_type == TYPE_TIME)
1148 {
1149 uint64_t tmp = 0;
1150 status = parse_part_number (&buffer, &buffer_len,
1151 &tmp);
1152 if (status == 0)
1153 {
1154 vl.time = (time_t) tmp;
1155 n.time = (time_t) tmp;
1156 }
1157 }
1158 else if (pkg_type == TYPE_INTERVAL)
1159 {
1160 uint64_t tmp = 0;
1161 status = parse_part_number (&buffer, &buffer_len,
1162 &tmp);
1163 if (status == 0)
1164 vl.interval = (int) tmp;
1165 }
1166 else if (pkg_type == TYPE_HOST)
1167 {
1168 status = parse_part_string (&buffer, &buffer_len,
1169 vl.host, sizeof (vl.host));
1170 if (status == 0)
1171 sstrncpy (n.host, vl.host, sizeof (n.host));
1172 }
1173 else if (pkg_type == TYPE_PLUGIN)
1174 {
1175 status = parse_part_string (&buffer, &buffer_len,
1176 vl.plugin, sizeof (vl.plugin));
1177 if (status == 0)
1178 sstrncpy (n.plugin, vl.plugin,
1179 sizeof (n.plugin));
1180 }
1181 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1182 {
1183 status = parse_part_string (&buffer, &buffer_len,
1184 vl.plugin_instance,
1185 sizeof (vl.plugin_instance));
1186 if (status == 0)
1187 sstrncpy (n.plugin_instance,
1188 vl.plugin_instance,
1189 sizeof (n.plugin_instance));
1190 }
1191 else if (pkg_type == TYPE_TYPE)
1192 {
1193 status = parse_part_string (&buffer, &buffer_len,
1194 vl.type, sizeof (vl.type));
1195 if (status == 0)
1196 sstrncpy (n.type, vl.type, sizeof (n.type));
1197 }
1198 else if (pkg_type == TYPE_TYPE_INSTANCE)
1199 {
1200 status = parse_part_string (&buffer, &buffer_len,
1201 vl.type_instance,
1202 sizeof (vl.type_instance));
1203 if (status == 0)
1204 sstrncpy (n.type_instance, vl.type_instance,
1205 sizeof (n.type_instance));
1206 }
1207 else if (pkg_type == TYPE_MESSAGE)
1208 {
1209 status = parse_part_string (&buffer, &buffer_len,
1210 n.message, sizeof (n.message));
1212 if (status != 0)
1213 {
1214 /* do nothing */
1215 }
1216 else if ((n.severity != NOTIF_FAILURE)
1217 && (n.severity != NOTIF_WARNING)
1218 && (n.severity != NOTIF_OKAY))
1219 {
1220 INFO ("network plugin: "
1221 "Ignoring notification with "
1222 "unknown severity %i.",
1223 n.severity);
1224 }
1225 else if (n.time <= 0)
1226 {
1227 INFO ("network plugin: "
1228 "Ignoring notification with "
1229 "time == 0.");
1230 }
1231 else if (strlen (n.message) <= 0)
1232 {
1233 INFO ("network plugin: "
1234 "Ignoring notification with "
1235 "an empty message.");
1236 }
1237 else
1238 {
1239 plugin_dispatch_notification (&n);
1240 }
1241 }
1242 else if (pkg_type == TYPE_SEVERITY)
1243 {
1244 uint64_t tmp = 0;
1245 status = parse_part_number (&buffer, &buffer_len,
1246 &tmp);
1247 if (status == 0)
1248 n.severity = (int) tmp;
1249 }
1250 else
1251 {
1252 DEBUG ("network plugin: parse_packet: Unknown part"
1253 " type: 0x%04hx", pkg_type);
1254 buffer = ((char *) buffer) + pkg_length;
1255 }
1256 } /* while (buffer_len > sizeof (part_header_t)) */
1258 return (status);
1259 } /* }}} int parse_packet */
1261 static void free_sockent (sockent_t *se) /* {{{ */
1262 {
1263 sockent_t *next;
1264 while (se != NULL)
1265 {
1266 next = se->next;
1268 #if HAVE_GCRYPT_H
1269 if (se->cypher != NULL)
1270 {
1271 gcry_cipher_close (se->cypher);
1272 se->cypher = NULL;
1273 }
1274 free (se->shared_secret);
1275 #endif /* HAVE_GCRYPT_H */
1277 free (se->addr);
1278 free (se);
1280 se = next;
1281 }
1282 } /* }}} void free_sockent */
1284 /*
1285 * int network_set_ttl
1286 *
1287 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1288 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1289 *
1290 * The `struct addrinfo' is used to destinguish between unicast and multicast
1291 * sockets.
1292 */
1293 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1294 {
1295 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1296 network_config_ttl);
1298 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1299 return (-1);
1301 if (ai->ai_family == AF_INET)
1302 {
1303 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1304 int optname;
1306 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1307 optname = IP_MULTICAST_TTL;
1308 else
1309 optname = IP_TTL;
1311 if (setsockopt (se->fd, IPPROTO_IP, optname,
1312 &network_config_ttl,
1313 sizeof (network_config_ttl)) == -1)
1314 {
1315 char errbuf[1024];
1316 ERROR ("setsockopt: %s",
1317 sstrerror (errno, errbuf, sizeof (errbuf)));
1318 return (-1);
1319 }
1320 }
1321 else if (ai->ai_family == AF_INET6)
1322 {
1323 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1324 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1325 int optname;
1327 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1328 optname = IPV6_MULTICAST_HOPS;
1329 else
1330 optname = IPV6_UNICAST_HOPS;
1332 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
1333 &network_config_ttl,
1334 sizeof (network_config_ttl)) == -1)
1335 {
1336 char errbuf[1024];
1337 ERROR ("setsockopt: %s",
1338 sstrerror (errno, errbuf,
1339 sizeof (errbuf)));
1340 return (-1);
1341 }
1342 }
1344 return (0);
1345 } /* int network_set_ttl */
1347 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
1348 {
1349 int loop = 0;
1350 int yes = 1;
1352 /* allow multiple sockets to use the same PORT number */
1353 if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR,
1354 &yes, sizeof(yes)) == -1) {
1355 char errbuf[1024];
1356 ERROR ("setsockopt: %s",
1357 sstrerror (errno, errbuf, sizeof (errbuf)));
1358 return (-1);
1359 }
1361 DEBUG ("fd = %i; calling `bind'", se->fd);
1363 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
1364 {
1365 char errbuf[1024];
1366 ERROR ("bind: %s",
1367 sstrerror (errno, errbuf, sizeof (errbuf)));
1368 return (-1);
1369 }
1371 if (ai->ai_family == AF_INET)
1372 {
1373 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1374 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1375 {
1376 struct ip_mreq mreq;
1378 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
1380 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1381 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
1383 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1384 &loop, sizeof (loop)) == -1)
1385 {
1386 char errbuf[1024];
1387 ERROR ("setsockopt: %s",
1388 sstrerror (errno, errbuf,
1389 sizeof (errbuf)));
1390 return (-1);
1391 }
1393 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1394 &mreq, sizeof (mreq)) == -1)
1395 {
1396 char errbuf[1024];
1397 ERROR ("setsockopt: %s",
1398 sstrerror (errno, errbuf,
1399 sizeof (errbuf)));
1400 return (-1);
1401 }
1402 }
1403 }
1404 else if (ai->ai_family == AF_INET6)
1405 {
1406 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1407 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1408 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1409 {
1410 struct ipv6_mreq mreq;
1412 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
1414 memcpy (&mreq.ipv6mr_multiaddr,
1415 &addr->sin6_addr,
1416 sizeof (addr->sin6_addr));
1418 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1419 * ipv6mr_interface may be set to zeroes to
1420 * choose the default multicast interface or to
1421 * the index of a particular multicast-capable
1422 * interface if the host is multihomed.
1423 * Membership is associ-associated with a
1424 * single interface; programs running on
1425 * multihomed hosts may need to join the same
1426 * group on more than one interface.*/
1427 mreq.ipv6mr_interface = 0;
1429 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1430 &loop, sizeof (loop)) == -1)
1431 {
1432 char errbuf[1024];
1433 ERROR ("setsockopt: %s",
1434 sstrerror (errno, errbuf,
1435 sizeof (errbuf)));
1436 return (-1);
1437 }
1439 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1440 &mreq, sizeof (mreq)) == -1)
1441 {
1442 char errbuf[1024];
1443 ERROR ("setsockopt: %s",
1444 sstrerror (errno, errbuf,
1445 sizeof (errbuf)));
1446 return (-1);
1447 }
1448 }
1449 }
1451 return (0);
1452 } /* int network_bind_socket */
1454 #define CREATE_SOCKET_FLAGS_LISTEN 0x0001
1455 static sockent_t *network_create_socket (const char *node, /* {{{ */
1456 const char *service,
1457 const char *shared_secret,
1458 int security_level,
1459 int flags)
1460 {
1461 struct addrinfo ai_hints;
1462 struct addrinfo *ai_list, *ai_ptr;
1463 int ai_return;
1465 sockent_t *se_head = NULL;
1466 sockent_t *se_tail = NULL;
1468 DEBUG ("node = %s, service = %s", node, service);
1470 memset (&ai_hints, '\0', sizeof (ai_hints));
1471 ai_hints.ai_flags = 0;
1472 #ifdef AI_PASSIVE
1473 ai_hints.ai_flags |= AI_PASSIVE;
1474 #endif
1475 #ifdef AI_ADDRCONFIG
1476 ai_hints.ai_flags |= AI_ADDRCONFIG;
1477 #endif
1478 ai_hints.ai_family = AF_UNSPEC;
1479 ai_hints.ai_socktype = SOCK_DGRAM;
1480 ai_hints.ai_protocol = IPPROTO_UDP;
1482 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1483 if (ai_return != 0)
1484 {
1485 char errbuf[1024];
1486 ERROR ("getaddrinfo (%s, %s): %s",
1487 (node == NULL) ? "(null)" : node,
1488 (service == NULL) ? "(null)" : service,
1489 (ai_return == EAI_SYSTEM)
1490 ? sstrerror (errno, errbuf, sizeof (errbuf))
1491 : gai_strerror (ai_return));
1492 return (NULL);
1493 }
1495 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1496 {
1497 sockent_t *se;
1498 int status;
1500 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
1501 {
1502 char errbuf[1024];
1503 ERROR ("malloc: %s",
1504 sstrerror (errno, errbuf,
1505 sizeof (errbuf)));
1506 continue;
1507 }
1509 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
1510 {
1511 char errbuf[1024];
1512 ERROR ("malloc: %s",
1513 sstrerror (errno, errbuf,
1514 sizeof (errbuf)));
1515 free (se);
1516 continue;
1517 }
1519 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1520 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
1521 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1522 se->addrlen = ai_ptr->ai_addrlen;
1524 se->fd = socket (ai_ptr->ai_family,
1525 ai_ptr->ai_socktype,
1526 ai_ptr->ai_protocol);
1527 se->next = NULL;
1529 if (se->fd == -1)
1530 {
1531 char errbuf[1024];
1532 ERROR ("socket: %s",
1533 sstrerror (errno, errbuf,
1534 sizeof (errbuf)));
1535 free (se->addr);
1536 free (se);
1537 continue;
1538 }
1540 if ((flags & CREATE_SOCKET_FLAGS_LISTEN) != 0)
1541 {
1542 status = network_bind_socket (se, ai_ptr);
1543 if (status != 0)
1544 {
1545 close (se->fd);
1546 free (se->addr);
1547 free (se);
1548 continue;
1549 }
1550 }
1551 else /* sending socket */
1552 {
1553 network_set_ttl (se, ai_ptr);
1554 }
1556 #if HAVE_GCRYPT_H
1557 se->security_level = security_level;
1558 se->shared_secret = NULL;
1559 se->cypher = NULL;
1560 if (shared_secret != NULL)
1561 {
1562 se->shared_secret = sstrdup (shared_secret);
1563 assert (se->shared_secret != NULL);
1565 memset (se->shared_secret_hash, 0,
1566 sizeof (se->shared_secret_hash));
1567 gcry_md_hash_buffer (GCRY_MD_SHA256,
1568 se->shared_secret_hash,
1569 se->shared_secret,
1570 strlen (se->shared_secret));
1571 }
1572 #else
1573 /* Make compiler happy */
1574 security_level = 0;
1575 shared_secret = NULL;
1576 #endif /* HAVE_GCRYPT_H */
1578 if (se_tail == NULL)
1579 {
1580 se_head = se;
1581 se_tail = se;
1582 }
1583 else
1584 {
1585 se_tail->next = se;
1586 se_tail = se;
1587 }
1589 /* We don't open more than one write-socket per node/service pair.. */
1590 if ((flags & CREATE_SOCKET_FLAGS_LISTEN) == 0)
1591 break;
1592 }
1594 freeaddrinfo (ai_list);
1596 return (se_head);
1597 } /* }}} sockent_t *network_create_socket */
1599 static sockent_t *network_create_default_socket (int flags) /* {{{ */
1600 {
1601 sockent_t *se_ptr = NULL;
1602 sockent_t *se_head = NULL;
1603 sockent_t *se_tail = NULL;
1605 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR, NET_DEFAULT_PORT,
1606 /* shared secret = */ NULL, SECURITY_LEVEL_NONE,
1607 flags);
1609 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
1610 if (((flags & CREATE_SOCKET_FLAGS_LISTEN) == 0) && (se_ptr != NULL))
1611 return (se_ptr);
1613 if (se_ptr != NULL)
1614 {
1615 se_head = se_ptr;
1616 se_tail = se_ptr;
1617 while (se_tail->next != NULL)
1618 se_tail = se_tail->next;
1619 }
1621 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT,
1622 /* shared secret = */ NULL, SECURITY_LEVEL_NONE,
1623 flags);
1625 if (se_tail == NULL)
1626 return (se_ptr);
1628 se_tail->next = se_ptr;
1629 return (se_head);
1630 } /* }}} sockent_t *network_create_default_socket */
1632 static int network_add_listen_socket (const char *node, /* {{{ */
1633 const char *service, const char *shared_secret, int security_level)
1634 {
1635 sockent_t *se;
1636 sockent_t *se_ptr;
1637 int se_num = 0;
1639 int flags;
1641 flags = CREATE_SOCKET_FLAGS_LISTEN;
1643 if (service == NULL)
1644 service = NET_DEFAULT_PORT;
1646 if (node == NULL)
1647 se = network_create_default_socket (flags);
1648 else
1649 se = network_create_socket (node, service,
1650 shared_secret, security_level, flags);
1652 if (se == NULL)
1653 return (-1);
1655 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1656 se_num++;
1658 listen_sockets_pollfd = realloc (listen_sockets_pollfd,
1659 (listen_sockets_num + se_num)
1660 * sizeof (struct pollfd));
1662 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1663 {
1664 listen_sockets_pollfd[listen_sockets_num].fd = se_ptr->fd;
1665 listen_sockets_pollfd[listen_sockets_num].events = POLLIN | POLLPRI;
1666 listen_sockets_pollfd[listen_sockets_num].revents = 0;
1667 listen_sockets_num++;
1668 } /* for (se) */
1670 se_ptr = listen_sockets;
1671 while ((se_ptr != NULL) && (se_ptr->next != NULL))
1672 se_ptr = se_ptr->next;
1674 if (se_ptr == NULL)
1675 listen_sockets = se;
1676 else
1677 se_ptr->next = se;
1679 return (0);
1680 } /* }}} int network_add_listen_socket */
1682 static int network_add_sending_socket (const char *node, /* {{{ */
1683 const char *service, const char *shared_secret, int security_level)
1684 {
1685 sockent_t *se;
1686 sockent_t *se_ptr;
1688 if (service == NULL)
1689 service = NET_DEFAULT_PORT;
1691 if (node == NULL)
1692 se = network_create_default_socket (/* flags = */ 0);
1693 else
1694 se = network_create_socket (node, service,
1695 shared_secret, security_level,
1696 /* flags = */ 0);
1698 if (se == NULL)
1699 return (-1);
1701 if (sending_sockets == NULL)
1702 {
1703 sending_sockets = se;
1704 return (0);
1705 }
1707 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
1708 /* seek end */;
1710 se_ptr->next = se;
1711 return (0);
1712 } /* }}} int network_add_sending_socket */
1714 static void *dispatch_thread (void __attribute__((unused)) *arg)
1715 {
1716 while (42)
1717 {
1718 receive_list_entry_t *ent;
1720 /* Lock and wait for more data to come in */
1721 pthread_mutex_lock (&receive_list_lock);
1722 while ((listen_loop == 0)
1723 && (receive_list_head == NULL))
1724 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1726 /* Remove the head entry and unlock */
1727 ent = receive_list_head;
1728 if (ent != NULL)
1729 receive_list_head = ent->next;
1730 pthread_mutex_unlock (&receive_list_lock);
1732 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1733 * because we dispatch all missing packets before shutting down. */
1734 if (ent == NULL)
1735 break;
1737 parse_packet (ent);
1739 sfree (ent);
1740 } /* while (42) */
1742 return (NULL);
1743 } /* void *dispatch_thread */
1745 static int network_receive (void)
1746 {
1747 char buffer[BUFF_SIZE];
1748 int buffer_len;
1750 int i;
1751 int status;
1753 receive_list_entry_t *private_list_head;
1754 receive_list_entry_t *private_list_tail;
1756 if (listen_sockets_num == 0)
1757 network_add_listen_socket (/* node = */ NULL,
1758 /* service = */ NULL,
1759 /* shared secret = */ NULL,
1760 /* encryption = */ 0);
1762 if (listen_sockets_num == 0)
1763 {
1764 ERROR ("network: Failed to open a listening socket.");
1765 return (-1);
1766 }
1768 private_list_head = NULL;
1769 private_list_tail = NULL;
1771 while (listen_loop == 0)
1772 {
1773 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
1775 if (status <= 0)
1776 {
1777 char errbuf[1024];
1778 if (errno == EINTR)
1779 continue;
1780 ERROR ("poll failed: %s",
1781 sstrerror (errno, errbuf, sizeof (errbuf)));
1782 return (-1);
1783 }
1785 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1786 {
1787 receive_list_entry_t *ent;
1789 if ((listen_sockets_pollfd[i].revents
1790 & (POLLIN | POLLPRI)) == 0)
1791 continue;
1792 status--;
1794 buffer_len = recv (listen_sockets_pollfd[i].fd,
1795 buffer, sizeof (buffer),
1796 0 /* no flags */);
1797 if (buffer_len < 0)
1798 {
1799 char errbuf[1024];
1800 ERROR ("recv failed: %s",
1801 sstrerror (errno, errbuf,
1802 sizeof (errbuf)));
1803 return (-1);
1804 }
1806 /* TODO: Possible performance enhancement: Do not free
1807 * these entries in the dispatch thread but put them in
1808 * another list, so we don't have to allocate more and
1809 * more of these structures. */
1810 ent = malloc (sizeof (receive_list_entry_t));
1811 if (ent == NULL)
1812 {
1813 ERROR ("network plugin: malloc failed.");
1814 return (-1);
1815 }
1816 memset (ent, 0, sizeof (receive_list_entry_t));
1817 ent->fd = listen_sockets_pollfd[i].fd;
1818 ent->next = NULL;
1820 /* Hopefully this be optimized out by the compiler. It
1821 * might help prevent stupid bugs in the future though.
1822 */
1823 assert (sizeof (ent->data) == sizeof (buffer));
1825 memcpy (ent->data, buffer, buffer_len);
1826 ent->data_len = buffer_len;
1828 if (private_list_head == NULL)
1829 private_list_head = ent;
1830 else
1831 private_list_tail->next = ent;
1832 private_list_tail = ent;
1834 /* Do not block here. Blocking here has led to
1835 * insufficient performance in the past. */
1836 if (pthread_mutex_trylock (&receive_list_lock) == 0)
1837 {
1838 if (receive_list_head == NULL)
1839 receive_list_head = private_list_head;
1840 else
1841 receive_list_tail->next = private_list_head;
1842 receive_list_tail = private_list_tail;
1844 private_list_head = NULL;
1845 private_list_tail = NULL;
1847 pthread_cond_signal (&receive_list_cond);
1848 pthread_mutex_unlock (&receive_list_lock);
1849 }
1850 } /* for (listen_sockets_pollfd) */
1851 } /* while (listen_loop == 0) */
1853 /* Make sure everything is dispatched before exiting. */
1854 if (private_list_head != NULL)
1855 {
1856 pthread_mutex_lock (&receive_list_lock);
1858 if (receive_list_head == NULL)
1859 receive_list_head = private_list_head;
1860 else
1861 receive_list_tail->next = private_list_head;
1862 receive_list_tail = private_list_tail;
1864 private_list_head = NULL;
1865 private_list_tail = NULL;
1867 pthread_cond_signal (&receive_list_cond);
1868 pthread_mutex_unlock (&receive_list_lock);
1869 }
1871 return (0);
1872 } /* int network_receive */
1874 static void *receive_thread (void __attribute__((unused)) *arg)
1875 {
1876 return (network_receive () ? (void *) 1 : (void *) 0);
1877 } /* void *receive_thread */
1879 static void network_init_buffer (void)
1880 {
1881 memset (send_buffer, 0, sizeof (send_buffer));
1882 send_buffer_ptr = send_buffer;
1883 send_buffer_fill = 0;
1885 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
1886 } /* int network_init_buffer */
1888 static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */
1889 const char *buffer, size_t buffer_size)
1890 {
1891 int status;
1893 while (42)
1894 {
1895 status = sendto (se->fd, buffer, buffer_size, 0 /* no flags */,
1896 (struct sockaddr *) se->addr, se->addrlen);
1897 if (status < 0)
1898 {
1899 char errbuf[1024];
1900 if (errno == EINTR)
1901 continue;
1902 ERROR ("network plugin: sendto failed: %s",
1903 sstrerror (errno, errbuf,
1904 sizeof (errbuf)));
1905 break;
1906 }
1908 break;
1909 } /* while (42) */
1910 } /* }}} void networt_send_buffer_plain */
1912 #if HAVE_GCRYPT_H
1913 static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */
1914 const char *in_buffer, size_t in_buffer_size)
1915 {
1916 part_signature_sha256_t ps;
1917 char buffer[sizeof (ps) + in_buffer_size];
1919 gcry_md_hd_t hd;
1920 gcry_error_t err;
1921 unsigned char *hash;
1923 hd = NULL;
1924 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
1925 if (err != 0)
1926 {
1927 ERROR ("network plugin: Creating HMAC object failed: %s",
1928 gcry_strerror (err));
1929 return;
1930 }
1932 err = gcry_md_setkey (hd, se->shared_secret,
1933 strlen (se->shared_secret));
1934 if (err != 0)
1935 {
1936 ERROR ("network plugin: gcry_md_setkey failed: %s",
1937 gcry_strerror (err));
1938 gcry_md_close (hd);
1939 return;
1940 }
1942 /* Initialize the `ps' structure. */
1943 memset (&ps, 0, sizeof (ps));
1944 ps.head.type = htons (TYPE_SIGN_SHA256);
1945 ps.head.length = htons ((uint16_t) sizeof (ps));
1947 /* Calculate the hash value. */
1948 gcry_md_write (hd, in_buffer, in_buffer_size);
1949 hash = gcry_md_read (hd, GCRY_MD_SHA256);
1950 if (hash == NULL)
1951 {
1952 ERROR ("network plugin: gcry_md_read failed.");
1953 gcry_md_close (hd);
1954 return;
1955 }
1957 /* Add the signature and fill the rest of the buffer. */
1958 memcpy (ps.hash, hash, sizeof (ps.hash));
1959 memcpy (buffer, &ps, sizeof (ps));
1960 memcpy (buffer + sizeof (ps), in_buffer, in_buffer_size);
1962 gcry_md_close (hd);
1963 hd = NULL;
1965 networt_send_buffer_plain (se, buffer, sizeof (buffer));
1966 } /* }}} void networt_send_buffer_signed */
1968 static void networt_send_buffer_encrypted (sockent_t *se, /* {{{ */
1969 const char *in_buffer, size_t in_buffer_size)
1970 {
1971 part_encryption_aes256_t pea;
1972 char buffer[sizeof (pea) + in_buffer_size];
1973 size_t buffer_size;
1974 size_t buffer_offset;
1975 size_t padding_size;
1976 gcry_error_t err;
1977 gcry_cipher_hd_t cypher;
1979 /* Round to the next multiple of 16, because AES has a block size of 128 bit.
1980 * the first 20 bytes of `pea' are not encrypted and must be subtracted. */
1981 buffer_size = in_buffer_size +
1982 (PART_ENCRYPTION_AES256_SIZE - PART_ENCRYPTION_AES256_UNENCR_SIZE);
1983 padding_size = buffer_size;
1984 /* Round to the next multiple of 16. */
1985 buffer_size = (buffer_size + 15) / 16;
1986 buffer_size = buffer_size * 16;
1987 /* Calculate padding_size */
1988 padding_size = buffer_size - padding_size;
1989 assert (padding_size <= sizeof (pea.padding));
1990 /* Now add the unencrypted bytes. */
1991 buffer_size += PART_ENCRYPTION_AES256_UNENCR_SIZE;
1993 DEBUG ("network plugin: networt_send_buffer_encrypted: "
1994 "buffer_size = %zu;", buffer_size);
1996 /* Initialize the header fields */
1997 memset (&pea, 0, sizeof (pea));
1998 pea.head.type = htons (TYPE_ENCR_AES256);
1999 pea.head.length = htons ((uint16_t) buffer_size);
2000 pea.orig_length = htons ((uint16_t) in_buffer_size);
2002 /* Chose a random initialization vector. */
2003 gcry_randomize (&pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2005 /* Create hash of the payload */
2006 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2008 /* Fill the extra field with random values. Some entropy in the encrypted
2009 * data is usually not a bad thing, I hope. */
2010 if (padding_size > 0)
2011 gcry_randomize (&pea.padding, padding_size, GCRY_STRONG_RANDOM);
2013 /* Initialize the buffer */
2014 buffer_offset = 0;
2015 memset (buffer, 0, sizeof (buffer));
2017 #define BUFFER_ADD(p,s) do { \
2018 memcpy (buffer + buffer_offset, (p), (s)); \
2019 buffer_offset += (s); \
2020 } while (0)
2022 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2023 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2024 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2025 BUFFER_ADD (&pea.orig_length, sizeof (pea.orig_length));
2026 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2028 if (padding_size > 0)
2029 BUFFER_ADD (pea.padding, padding_size);
2031 BUFFER_ADD (in_buffer, in_buffer_size);
2033 assert (buffer_offset == buffer_size);
2035 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv));
2036 if (cypher == NULL)
2037 return;
2039 /* Encrypt the buffer in-place */
2040 err = gcry_cipher_encrypt (cypher,
2041 buffer + PART_ENCRYPTION_AES256_UNENCR_SIZE,
2042 buffer_size - PART_ENCRYPTION_AES256_UNENCR_SIZE,
2043 /* in = */ NULL, /* in len = */ 0);
2044 if (err != 0)
2045 {
2046 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2047 gcry_strerror (err));
2048 return;
2049 }
2051 /* Send it out without further modifications */
2052 networt_send_buffer_plain (se, buffer, buffer_size);
2053 #undef BUFFER_ADD
2054 } /* }}} void networt_send_buffer_encrypted */
2055 #endif /* HAVE_GCRYPT_H */
2057 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2058 {
2059 sockent_t *se;
2061 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2063 for (se = sending_sockets; se != NULL; se = se->next)
2064 {
2065 #if HAVE_GCRYPT_H
2066 if (se->security_level == SECURITY_LEVEL_ENCRYPT)
2067 networt_send_buffer_encrypted (se, buffer, buffer_len);
2068 else if (se->security_level == SECURITY_LEVEL_SIGN)
2069 networt_send_buffer_signed (se, buffer, buffer_len);
2070 else /* if (se->security_level == SECURITY_LEVEL_NONE) */
2071 #endif /* HAVE_GCRYPT_H */
2072 networt_send_buffer_plain (se, buffer, buffer_len);
2073 } /* for (sending_sockets) */
2074 } /* }}} void network_send_buffer */
2076 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
2077 value_list_t *vl_def,
2078 const data_set_t *ds, const value_list_t *vl)
2079 {
2080 char *buffer_orig = buffer;
2082 if (strcmp (vl_def->host, vl->host) != 0)
2083 {
2084 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2085 vl->host, strlen (vl->host)) != 0)
2086 return (-1);
2087 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2088 }
2090 if (vl_def->time != vl->time)
2091 {
2092 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
2093 (uint64_t) vl->time))
2094 return (-1);
2095 vl_def->time = vl->time;
2096 }
2098 if (vl_def->interval != vl->interval)
2099 {
2100 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
2101 (uint64_t) vl->interval))
2102 return (-1);
2103 vl_def->interval = vl->interval;
2104 }
2106 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2107 {
2108 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2109 vl->plugin, strlen (vl->plugin)) != 0)
2110 return (-1);
2111 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2112 }
2114 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2115 {
2116 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2117 vl->plugin_instance,
2118 strlen (vl->plugin_instance)) != 0)
2119 return (-1);
2120 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2121 }
2123 if (strcmp (vl_def->type, vl->type) != 0)
2124 {
2125 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2126 vl->type, strlen (vl->type)) != 0)
2127 return (-1);
2128 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2129 }
2131 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2132 {
2133 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2134 vl->type_instance,
2135 strlen (vl->type_instance)) != 0)
2136 return (-1);
2137 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2138 }
2140 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2141 return (-1);
2143 return (buffer - buffer_orig);
2144 } /* }}} int add_to_buffer */
2146 static void flush_buffer (void)
2147 {
2148 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2149 send_buffer_fill);
2151 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2152 network_init_buffer ();
2153 }
2155 static int network_write (const data_set_t *ds, const value_list_t *vl,
2156 user_data_t __attribute__((unused)) *user_data)
2157 {
2158 int status;
2160 /* If the value is already in the cache, we have received it via the
2161 * network. We write it again if forwarding is activated. It's then in
2162 * the cache and should we receive it again we will ignore it. */
2163 status = cache_check (vl);
2164 if ((network_config_forward == 0)
2165 && (status != 0))
2166 return (0);
2168 pthread_mutex_lock (&send_buffer_lock);
2170 status = add_to_buffer (send_buffer_ptr,
2171 sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
2172 &send_buffer_vl,
2173 ds, vl);
2174 if (status >= 0)
2175 {
2176 /* status == bytes added to the buffer */
2177 send_buffer_fill += status;
2178 send_buffer_ptr += status;
2179 }
2180 else
2181 {
2182 flush_buffer ();
2184 status = add_to_buffer (send_buffer_ptr,
2185 sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
2186 &send_buffer_vl,
2187 ds, vl);
2189 if (status >= 0)
2190 {
2191 send_buffer_fill += status;
2192 send_buffer_ptr += status;
2193 }
2194 }
2196 if (status < 0)
2197 {
2198 ERROR ("network plugin: Unable to append to the "
2199 "buffer for some weird reason");
2200 }
2201 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
2202 {
2203 flush_buffer ();
2204 }
2206 pthread_mutex_unlock (&send_buffer_lock);
2208 return ((status < 0) ? -1 : 0);
2209 } /* int network_write */
2211 static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
2212 int *retval)
2213 {
2214 if ((ci->values_num != 1)
2215 || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
2216 && (ci->values[0].type != OCONFIG_TYPE_STRING)))
2217 {
2218 ERROR ("network plugin: The `%s' config option needs "
2219 "exactly one boolean argument.", ci->key);
2220 return (-1);
2221 }
2223 if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
2224 {
2225 if (ci->values[0].value.boolean)
2226 *retval = 1;
2227 else
2228 *retval = 0;
2229 }
2230 else
2231 {
2232 char *str = ci->values[0].value.string;
2234 if ((strcasecmp ("true", str) == 0)
2235 || (strcasecmp ("yes", str) == 0)
2236 || (strcasecmp ("on", str) == 0))
2237 *retval = 1;
2238 else if ((strcasecmp ("false", str) == 0)
2239 || (strcasecmp ("no", str) == 0)
2240 || (strcasecmp ("off", str) == 0))
2241 *retval = 0;
2242 else
2243 {
2244 ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
2245 "option as boolean value.",
2246 str, ci->key);
2247 return (-1);
2248 }
2249 }
2251 return (0);
2252 } /* }}} int network_config_set_boolean */
2254 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2255 {
2256 int tmp;
2257 if ((ci->values_num != 1)
2258 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2259 {
2260 WARNING ("network plugin: The `TimeToLive' config option needs exactly "
2261 "one numeric argument.");
2262 return (-1);
2263 }
2265 tmp = (int) ci->values[0].value.number;
2266 if ((tmp > 0) && (tmp <= 255))
2267 network_config_ttl = tmp;
2269 return (0);
2270 } /* }}} int network_config_set_ttl */
2272 #if HAVE_GCRYPT_H
2273 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
2274 int *retval)
2275 {
2276 char *str;
2277 if ((ci->values_num != 1)
2278 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2279 {
2280 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
2281 "one string argument.");
2282 return (-1);
2283 }
2285 str = ci->values[0].value.string;
2286 if (strcasecmp ("Encrypt", str) == 0)
2287 *retval = SECURITY_LEVEL_ENCRYPT;
2288 else if (strcasecmp ("Sign", str) == 0)
2289 *retval = SECURITY_LEVEL_SIGN;
2290 else if (strcasecmp ("None", str) == 0)
2291 *retval = SECURITY_LEVEL_NONE;
2292 else
2293 {
2294 WARNING ("network plugin: Unknown security level: %s.", str);
2295 return (-1);
2296 }
2298 return (0);
2299 } /* }}} int network_config_set_security_level */
2300 #endif /* HAVE_GCRYPT_H */
2302 static int network_config_listen_server (const oconfig_item_t *ci) /* {{{ */
2303 {
2304 char *node;
2305 char *service;
2306 char *shared_secret = NULL;
2307 int security_level = SECURITY_LEVEL_NONE;
2308 int i;
2310 if ((ci->values_num < 1) || (ci->values_num > 2)
2311 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2312 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2313 {
2314 ERROR ("network plugin: The `%s' config option needs "
2315 "one or two string arguments.", ci->key);
2316 return (-1);
2317 }
2319 node = ci->values[0].value.string;
2320 if (ci->values_num >= 2)
2321 service = ci->values[1].value.string;
2322 else
2323 service = NULL;
2325 for (i = 0; i < ci->children_num; i++)
2326 {
2327 oconfig_item_t *child = ci->children + i;
2329 #if HAVE_GCRYPT_H
2330 if (strcasecmp ("Secret", child->key) == 0)
2331 {
2332 if ((child->values_num == 1)
2333 && (child->values[0].type == OCONFIG_TYPE_STRING))
2334 shared_secret = child->values[0].value.string;
2335 else
2336 ERROR ("network plugin: The `Secret' option needs exactly one string "
2337 "argument.");
2338 }
2339 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2340 network_config_set_security_level (child, &security_level);
2341 else
2342 #endif /* HAVE_GCRYPT_H */
2343 {
2344 WARNING ("network plugin: Option `%s' is not allowed here.",
2345 child->key);
2346 }
2347 }
2349 if ((security_level > SECURITY_LEVEL_NONE) && (shared_secret == NULL))
2350 {
2351 ERROR ("network plugin: A security level higher than `none' was "
2352 "requested, but no shared key was given. Cowardly refusing to open "
2353 "this socket!");
2354 return (-1);
2355 }
2357 if (strcasecmp ("Listen", ci->key) == 0)
2358 network_add_listen_socket (node, service, shared_secret, security_level);
2359 else
2360 network_add_sending_socket (node, service, shared_secret, security_level);
2362 return (0);
2363 } /* }}} int network_config_listen_server */
2365 static int network_config_set_cache_flush (const oconfig_item_t *ci) /* {{{ */
2366 {
2367 int tmp;
2368 if ((ci->values_num != 1)
2369 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2370 {
2371 WARNING ("network plugin: The `CacheFlush' config option needs exactly "
2372 "one numeric argument.");
2373 return (-1);
2374 }
2376 tmp = (int) ci->values[0].value.number;
2377 if (tmp > 0)
2378 network_config_ttl = tmp;
2380 return (0);
2381 } /* }}} int network_config_set_cache_flush */
2383 static int network_config (oconfig_item_t *ci) /* {{{ */
2384 {
2385 int i;
2387 for (i = 0; i < ci->children_num; i++)
2388 {
2389 oconfig_item_t *child = ci->children + i;
2391 if ((strcasecmp ("Listen", child->key) == 0)
2392 || (strcasecmp ("Server", child->key) == 0))
2393 network_config_listen_server (child);
2394 else if (strcasecmp ("TimeToLive", child->key) == 0)
2395 network_config_set_ttl (child);
2396 else if (strcasecmp ("Forward", child->key) == 0)
2397 network_config_set_boolean (child, &network_config_forward);
2398 else if (strcasecmp ("CacheFlush", child->key) == 0)
2399 network_config_set_cache_flush (child);
2400 else
2401 {
2402 WARNING ("network plugin: Option `%s' is not allowed here.",
2403 child->key);
2404 }
2405 }
2407 return (0);
2408 } /* }}} int network_config */
2410 static int network_notification (const notification_t *n,
2411 user_data_t __attribute__((unused)) *user_data)
2412 {
2413 char buffer[BUFF_SIZE];
2414 char *buffer_ptr = buffer;
2415 int buffer_free = sizeof (buffer);
2416 int status;
2418 memset (buffer, '\0', sizeof (buffer));
2421 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
2422 (uint64_t) n->time);
2423 if (status != 0)
2424 return (-1);
2426 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
2427 (uint64_t) n->severity);
2428 if (status != 0)
2429 return (-1);
2431 if (strlen (n->host) > 0)
2432 {
2433 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
2434 n->host, strlen (n->host));
2435 if (status != 0)
2436 return (-1);
2437 }
2439 if (strlen (n->plugin) > 0)
2440 {
2441 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
2442 n->plugin, strlen (n->plugin));
2443 if (status != 0)
2444 return (-1);
2445 }
2447 if (strlen (n->plugin_instance) > 0)
2448 {
2449 status = write_part_string (&buffer_ptr, &buffer_free,
2450 TYPE_PLUGIN_INSTANCE,
2451 n->plugin_instance, strlen (n->plugin_instance));
2452 if (status != 0)
2453 return (-1);
2454 }
2456 if (strlen (n->type) > 0)
2457 {
2458 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
2459 n->type, strlen (n->type));
2460 if (status != 0)
2461 return (-1);
2462 }
2464 if (strlen (n->type_instance) > 0)
2465 {
2466 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
2467 n->type_instance, strlen (n->type_instance));
2468 if (status != 0)
2469 return (-1);
2470 }
2472 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
2473 n->message, strlen (n->message));
2474 if (status != 0)
2475 return (-1);
2477 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
2479 return (0);
2480 } /* int network_notification */
2482 static int network_shutdown (void)
2483 {
2484 listen_loop++;
2486 /* Kill the listening thread */
2487 if (receive_thread_running != 0)
2488 {
2489 INFO ("network plugin: Stopping receive thread.");
2490 pthread_kill (receive_thread_id, SIGTERM);
2491 pthread_join (receive_thread_id, NULL /* no return value */);
2492 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
2493 receive_thread_running = 0;
2494 }
2496 /* Shutdown the dispatching thread */
2497 if (dispatch_thread_running != 0)
2498 {
2499 INFO ("network plugin: Stopping dispatch thread.");
2500 pthread_mutex_lock (&receive_list_lock);
2501 pthread_cond_broadcast (&receive_list_cond);
2502 pthread_mutex_unlock (&receive_list_lock);
2503 pthread_join (dispatch_thread_id, /* ret = */ NULL);
2504 dispatch_thread_running = 0;
2505 }
2507 free_sockent (listen_sockets);
2509 if (send_buffer_fill > 0)
2510 flush_buffer ();
2512 if (cache_tree != NULL)
2513 {
2514 void *key;
2515 void *value;
2517 while (c_avl_pick (cache_tree, &key, &value) == 0)
2518 {
2519 sfree (key);
2520 sfree (value);
2521 }
2522 c_avl_destroy (cache_tree);
2523 cache_tree = NULL;
2524 }
2526 /* TODO: Close `sending_sockets' */
2528 plugin_unregister_config ("network");
2529 plugin_unregister_init ("network");
2530 plugin_unregister_write ("network");
2531 plugin_unregister_shutdown ("network");
2533 /* Let the init function do it's move again ;) */
2534 cache_flush_last = 0;
2536 return (0);
2537 } /* int network_shutdown */
2539 static int network_init (void)
2540 {
2541 /* Check if we were already initialized. If so, just return - there's
2542 * nothing more to do (for now, that is). */
2543 if (cache_flush_last != 0)
2544 return (0);
2546 plugin_register_shutdown ("network", network_shutdown);
2548 network_init_buffer ();
2550 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
2551 cache_flush_last = time (NULL);
2553 /* setup socket(s) and so on */
2554 if (sending_sockets != NULL)
2555 {
2556 plugin_register_write ("network", network_write,
2557 /* user_data = */ NULL);
2558 plugin_register_notification ("network", network_notification,
2559 /* user_data = */ NULL);
2560 }
2562 /* If no threads need to be started, return here. */
2563 if ((listen_sockets_num == 0)
2564 || ((dispatch_thread_running != 0)
2565 && (receive_thread_running != 0)))
2566 return (0);
2568 if (dispatch_thread_running == 0)
2569 {
2570 int status;
2571 status = pthread_create (&dispatch_thread_id,
2572 NULL /* no attributes */,
2573 dispatch_thread,
2574 NULL /* no argument */);
2575 if (status != 0)
2576 {
2577 char errbuf[1024];
2578 ERROR ("network: pthread_create failed: %s",
2579 sstrerror (errno, errbuf,
2580 sizeof (errbuf)));
2581 }
2582 else
2583 {
2584 dispatch_thread_running = 1;
2585 }
2586 }
2588 if (receive_thread_running == 0)
2589 {
2590 int status;
2591 status = pthread_create (&receive_thread_id,
2592 NULL /* no attributes */,
2593 receive_thread,
2594 NULL /* no argument */);
2595 if (status != 0)
2596 {
2597 char errbuf[1024];
2598 ERROR ("network: pthread_create failed: %s",
2599 sstrerror (errno, errbuf,
2600 sizeof (errbuf)));
2601 }
2602 else
2603 {
2604 receive_thread_running = 1;
2605 }
2606 }
2608 return (0);
2609 } /* int network_init */
2611 /*
2612 * The flush option of the network plugin cannot flush individual identifiers.
2613 * All the values are added to a buffer and sent when the buffer is full, the
2614 * requested value may or may not be in there, it's not worth finding out. We
2615 * just send the buffer if `flush' is called - if the requested value was in
2616 * there, good. If not, well, then there is nothing to flush.. -octo
2617 */
2618 static int network_flush (int timeout,
2619 const char __attribute__((unused)) *identifier,
2620 user_data_t __attribute__((unused)) *user_data)
2621 {
2622 pthread_mutex_lock (&send_buffer_lock);
2624 if (((time (NULL) - cache_flush_last) >= timeout)
2625 && (send_buffer_fill > 0))
2626 {
2627 flush_buffer ();
2628 }
2630 pthread_mutex_unlock (&send_buffer_lock);
2632 return (0);
2633 } /* int network_flush */
2635 void module_register (void)
2636 {
2637 plugin_register_complex_config ("network", network_config);
2638 plugin_register_init ("network", network_init);
2639 plugin_register_flush ("network", network_flush,
2640 /* user_data = */ NULL);
2641 } /* void module_register */
2643 /* vim: set fdm=marker : */