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 * Hash/orig length: 22
71 * Padding (up to): 15
72 * --------------------
73 * 41
74 */
75 #define BUFF_SIG_SIZE 41
77 /*
78 * Private data types
79 */
80 typedef struct sockent
81 {
82 int fd;
83 struct sockaddr_storage *addr;
84 socklen_t addrlen;
86 #define SECURITY_LEVEL_NONE 0
87 #if HAVE_GCRYPT_H
88 # define SECURITY_LEVEL_SIGN 1
89 # define SECURITY_LEVEL_ENCRYPT 2
90 int security_level;
91 char *shared_secret;
92 gcry_cipher_hd_t cypher;
93 #endif /* HAVE_GCRYPT_H */
95 struct sockent *next;
96 } sockent_t;
98 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
99 * 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
100 * +-------+-----------------------+-------------------------------+
101 * ! Ver. ! ! Length !
102 * +-------+-----------------------+-------------------------------+
103 */
104 struct part_header_s
105 {
106 uint16_t type;
107 uint16_t length;
108 };
109 typedef struct part_header_s part_header_t;
111 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
112 * 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
113 * +-------------------------------+-------------------------------+
114 * ! Type ! Length !
115 * +-------------------------------+-------------------------------+
116 * : (Length - 4) Bytes :
117 * +---------------------------------------------------------------+
118 */
119 struct part_string_s
120 {
121 part_header_t *head;
122 char *value;
123 };
124 typedef struct part_string_s part_string_t;
126 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
127 * 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
128 * +-------------------------------+-------------------------------+
129 * ! Type ! Length !
130 * +-------------------------------+-------------------------------+
131 * : (Length - 4 == 2 || 4 || 8) Bytes :
132 * +---------------------------------------------------------------+
133 */
134 struct part_number_s
135 {
136 part_header_t *head;
137 uint64_t *value;
138 };
139 typedef struct part_number_s part_number_t;
141 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
142 * 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
143 * +-------------------------------+-------------------------------+
144 * ! Type ! Length !
145 * +-------------------------------+---------------+---------------+
146 * ! Num of values ! Type0 ! Type1 !
147 * +-------------------------------+---------------+---------------+
148 * ! Value0 !
149 * ! !
150 * +---------------------------------------------------------------+
151 * ! Value1 !
152 * ! !
153 * +---------------------------------------------------------------+
154 */
155 struct part_values_s
156 {
157 part_header_t *head;
158 uint16_t *num_values;
159 uint8_t *values_types;
160 value_t *values;
161 };
162 typedef struct part_values_s part_values_t;
164 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
165 * 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
166 * +-------------------------------+-------------------------------+
167 * ! Type ! Length !
168 * +-------------------------------+-------------------------------+
169 * ! Hash (Bits 0 - 31) !
170 * : : :
171 * ! Hash (Bits 224 - 255) !
172 * +---------------------------------------------------------------+
173 */
174 struct part_signature_sha256_s
175 {
176 part_header_t head;
177 char hash[32];
178 };
179 typedef struct part_signature_sha256_s part_signature_sha256_t;
181 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
182 * 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
183 * +-------------------------------+-------------------------------+
184 * ! Type ! Length !
185 * +-------------------------------+-------------------------------+
186 * ! Original length ! Padding (0 - 15 bytes) !
187 * +-------------------------------+-------------------------------+
188 * ! Hash (Bits 0 - 31) !
189 * : : :
190 * ! Hash (Bits 128 - 159) !
191 * +---------------------------------------------------------------+
192 */
193 struct part_encryption_aes256_s
194 {
195 part_header_t head;
196 uint16_t orig_length;
197 char padding[15];
198 char hash[20];
199 };
200 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
202 struct receive_list_entry_s
203 {
204 char data[BUFF_SIZE];
205 int data_len;
206 int fd;
207 struct receive_list_entry_s *next;
208 };
209 typedef struct receive_list_entry_s receive_list_entry_t;
211 /*
212 * Private variables
213 */
214 static int network_config_ttl = 0;
215 static int network_config_forward = 0;
217 static sockent_t *sending_sockets = NULL;
219 static receive_list_entry_t *receive_list_head = NULL;
220 static receive_list_entry_t *receive_list_tail = NULL;
221 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
222 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
224 static sockent_t *listen_sockets = NULL;
225 static struct pollfd *listen_sockets_pollfd = NULL;
226 static int listen_sockets_num = 0;
228 /* The receive and dispatch threads will run as long as `listen_loop' is set to
229 * zero. */
230 static int listen_loop = 0;
231 static int receive_thread_running = 0;
232 static pthread_t receive_thread_id;
233 static int dispatch_thread_running = 0;
234 static pthread_t dispatch_thread_id;
236 /* Buffer in which to-be-sent network packets are constructed. */
237 static char send_buffer[BUFF_SIZE];
238 static char *send_buffer_ptr;
239 static int send_buffer_fill;
240 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
241 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
243 /* In this cache we store all the values we received, so we can send out only
244 * those values which were *not* received via the network plugin, too. This is
245 * used for the `Forward false' option. */
246 static c_avl_tree_t *cache_tree = NULL;
247 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
248 static time_t cache_flush_last = 0;
249 static int cache_flush_interval = 1800;
251 /*
252 * Private functions
253 */
254 static int cache_flush (void)
255 {
256 char **keys = NULL;
257 int keys_num = 0;
259 char **tmp;
260 int i;
262 char *key;
263 time_t *value;
264 c_avl_iterator_t *iter;
266 time_t curtime = time (NULL);
268 iter = c_avl_get_iterator (cache_tree);
269 while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
270 {
271 if ((curtime - *value) <= cache_flush_interval)
272 continue;
273 tmp = (char **) realloc (keys,
274 (keys_num + 1) * sizeof (char *));
275 if (tmp == NULL)
276 {
277 sfree (keys);
278 c_avl_iterator_destroy (iter);
279 ERROR ("network plugin: cache_flush: realloc"
280 " failed.");
281 return (-1);
282 }
283 keys = tmp;
284 keys[keys_num] = key;
285 keys_num++;
286 } /* while (c_avl_iterator_next) */
287 c_avl_iterator_destroy (iter);
289 for (i = 0; i < keys_num; i++)
290 {
291 if (c_avl_remove (cache_tree, keys[i], (void *) &key,
292 (void *) &value) != 0)
293 {
294 WARNING ("network plugin: cache_flush: c_avl_remove"
295 " (%s) failed.", keys[i]);
296 continue;
297 }
299 sfree (key);
300 sfree (value);
301 }
303 sfree (keys);
305 DEBUG ("network plugin: cache_flush: Removed %i %s",
306 keys_num, (keys_num == 1) ? "entry" : "entries");
307 cache_flush_last = curtime;
308 return (0);
309 } /* int cache_flush */
311 static int cache_check (const value_list_t *vl)
312 {
313 char key[1024];
314 time_t *value = NULL;
315 int retval = -1;
317 if (cache_tree == NULL)
318 return (-1);
320 if (format_name (key, sizeof (key), vl->host, vl->plugin,
321 vl->plugin_instance, vl->type, vl->type_instance))
322 return (-1);
324 pthread_mutex_lock (&cache_lock);
326 if (c_avl_get (cache_tree, key, (void *) &value) == 0)
327 {
328 if (*value < vl->time)
329 {
330 *value = vl->time;
331 retval = 0;
332 }
333 else
334 {
335 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
336 (int) *value, (int) vl->time);
337 retval = 1;
338 }
339 }
340 else
341 {
342 char *key_copy = strdup (key);
343 value = malloc (sizeof (time_t));
344 if ((key_copy != NULL) && (value != NULL))
345 {
346 *value = vl->time;
347 c_avl_insert (cache_tree, key_copy, value);
348 retval = 0;
349 }
350 else
351 {
352 sfree (key_copy);
353 sfree (value);
354 }
355 }
357 if ((time (NULL) - cache_flush_last) > cache_flush_interval)
358 cache_flush ();
360 pthread_mutex_unlock (&cache_lock);
362 return (retval);
363 } /* int cache_check */
365 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
366 const data_set_t *ds, const value_list_t *vl)
367 {
368 char *packet_ptr;
369 int packet_len;
370 int num_values;
372 part_header_t pkg_ph;
373 uint16_t pkg_num_values;
374 uint8_t *pkg_values_types;
375 value_t *pkg_values;
377 int offset;
378 int i;
380 num_values = vl->values_len;
381 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
382 + (num_values * sizeof (uint8_t))
383 + (num_values * sizeof (value_t));
385 if (*ret_buffer_len < packet_len)
386 return (-1);
388 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
389 if (pkg_values_types == NULL)
390 {
391 ERROR ("network plugin: write_part_values: malloc failed.");
392 return (-1);
393 }
395 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
396 if (pkg_values == NULL)
397 {
398 free (pkg_values_types);
399 ERROR ("network plugin: write_part_values: malloc failed.");
400 return (-1);
401 }
403 pkg_ph.type = htons (TYPE_VALUES);
404 pkg_ph.length = htons (packet_len);
406 pkg_num_values = htons ((uint16_t) vl->values_len);
408 for (i = 0; i < num_values; i++)
409 {
410 if (ds->ds[i].type == DS_TYPE_COUNTER)
411 {
412 pkg_values_types[i] = DS_TYPE_COUNTER;
413 pkg_values[i].counter = htonll (vl->values[i].counter);
414 }
415 else
416 {
417 pkg_values_types[i] = DS_TYPE_GAUGE;
418 pkg_values[i].gauge = htond (vl->values[i].gauge);
419 }
420 }
422 /*
423 * Use `memcpy' to write everything to the buffer, because the pointer
424 * may be unaligned and some architectures, such as SPARC, can't handle
425 * that.
426 */
427 packet_ptr = *ret_buffer;
428 offset = 0;
429 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
430 offset += sizeof (pkg_ph);
431 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
432 offset += sizeof (pkg_num_values);
433 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
434 offset += num_values * sizeof (uint8_t);
435 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
436 offset += num_values * sizeof (value_t);
438 assert (offset == packet_len);
440 *ret_buffer = packet_ptr + packet_len;
441 *ret_buffer_len -= packet_len;
443 free (pkg_values_types);
444 free (pkg_values);
446 return (0);
447 } /* int write_part_values */
449 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
450 int type, uint64_t value)
451 {
452 char *packet_ptr;
453 int packet_len;
455 part_header_t pkg_head;
456 uint64_t pkg_value;
458 int offset;
460 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
462 if (*ret_buffer_len < packet_len)
463 return (-1);
465 pkg_head.type = htons (type);
466 pkg_head.length = htons (packet_len);
467 pkg_value = htonll (value);
469 packet_ptr = *ret_buffer;
470 offset = 0;
471 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
472 offset += sizeof (pkg_head);
473 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
474 offset += sizeof (pkg_value);
476 assert (offset == packet_len);
478 *ret_buffer = packet_ptr + packet_len;
479 *ret_buffer_len -= packet_len;
481 return (0);
482 } /* int write_part_number */
484 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
485 int type, const char *str, int str_len)
486 {
487 char *buffer;
488 int buffer_len;
490 uint16_t pkg_type;
491 uint16_t pkg_length;
493 int offset;
495 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
496 if (*ret_buffer_len < buffer_len)
497 return (-1);
499 pkg_type = htons (type);
500 pkg_length = htons (buffer_len);
502 buffer = *ret_buffer;
503 offset = 0;
504 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
505 offset += sizeof (pkg_type);
506 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
507 offset += sizeof (pkg_length);
508 memcpy (buffer + offset, str, str_len);
509 offset += str_len;
510 memset (buffer + offset, '\0', 1);
511 offset += 1;
513 assert (offset == buffer_len);
515 *ret_buffer = buffer + buffer_len;
516 *ret_buffer_len -= buffer_len;
518 return (0);
519 } /* int write_part_string */
521 static int parse_part_values (void **ret_buffer, int *ret_buffer_len,
522 value_t **ret_values, int *ret_num_values)
523 {
524 char *buffer = *ret_buffer;
525 int buffer_len = *ret_buffer_len;
527 uint16_t tmp16;
528 size_t exp_size;
529 int i;
531 uint16_t pkg_length;
532 uint16_t pkg_type;
533 uint16_t pkg_numval;
535 uint8_t *pkg_types;
536 value_t *pkg_values;
538 if (buffer_len < (15))
539 {
540 DEBUG ("network plugin: packet is too short: buffer_len = %i",
541 buffer_len);
542 return (-1);
543 }
545 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
546 buffer += sizeof (tmp16);
547 pkg_type = ntohs (tmp16);
549 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
550 buffer += sizeof (tmp16);
551 pkg_length = ntohs (tmp16);
553 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
554 buffer += sizeof (tmp16);
555 pkg_numval = ntohs (tmp16);
557 assert (pkg_type == TYPE_VALUES);
559 exp_size = 3 * sizeof (uint16_t)
560 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
561 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
562 {
563 WARNING ("network plugin: parse_part_values: "
564 "Packet too short: "
565 "Chunk of size %u expected, "
566 "but buffer has only %i bytes left.",
567 (unsigned int) exp_size, buffer_len);
568 return (-1);
569 }
571 if (pkg_length != exp_size)
572 {
573 WARNING ("network plugin: parse_part_values: "
574 "Length and number of values "
575 "in the packet don't match.");
576 return (-1);
577 }
579 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
580 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
581 if ((pkg_types == NULL) || (pkg_values == NULL))
582 {
583 sfree (pkg_types);
584 sfree (pkg_values);
585 ERROR ("network plugin: parse_part_values: malloc failed.");
586 return (-1);
587 }
589 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
590 buffer += pkg_numval * sizeof (uint8_t);
591 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
592 buffer += pkg_numval * sizeof (value_t);
594 for (i = 0; i < pkg_numval; i++)
595 {
596 if (pkg_types[i] == DS_TYPE_COUNTER)
597 pkg_values[i].counter = ntohll (pkg_values[i].counter);
598 else if (pkg_types[i] == DS_TYPE_GAUGE)
599 pkg_values[i].gauge = ntohd (pkg_values[i].gauge);
600 }
602 *ret_buffer = buffer;
603 *ret_buffer_len = buffer_len - pkg_length;
604 *ret_num_values = pkg_numval;
605 *ret_values = pkg_values;
607 sfree (pkg_types);
609 return (0);
610 } /* int parse_part_values */
612 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
613 uint64_t *value)
614 {
615 char *buffer = *ret_buffer;
616 int buffer_len = *ret_buffer_len;
618 uint16_t tmp16;
619 uint64_t tmp64;
620 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
622 uint16_t pkg_length;
623 uint16_t pkg_type;
625 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
626 {
627 WARNING ("network plugin: parse_part_number: "
628 "Packet too short: "
629 "Chunk of size %u expected, "
630 "but buffer has only %i bytes left.",
631 (unsigned int) exp_size, buffer_len);
632 return (-1);
633 }
635 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
636 buffer += sizeof (tmp16);
637 pkg_type = ntohs (tmp16);
639 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
640 buffer += sizeof (tmp16);
641 pkg_length = ntohs (tmp16);
643 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
644 buffer += sizeof (tmp64);
645 *value = ntohll (tmp64);
647 *ret_buffer = buffer;
648 *ret_buffer_len = buffer_len - pkg_length;
650 return (0);
651 } /* int parse_part_number */
653 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
654 char *output, int output_len)
655 {
656 char *buffer = *ret_buffer;
657 int buffer_len = *ret_buffer_len;
659 uint16_t tmp16;
660 size_t header_size = 2 * sizeof (uint16_t);
662 uint16_t pkg_length;
663 uint16_t pkg_type;
665 if ((buffer_len < 0) || ((size_t) buffer_len < header_size))
666 {
667 WARNING ("network plugin: parse_part_string: "
668 "Packet too short: "
669 "Chunk of at least size %u expected, "
670 "but buffer has only %i bytes left.",
671 (unsigned int) header_size, buffer_len);
672 return (-1);
673 }
675 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
676 buffer += sizeof (tmp16);
677 pkg_type = ntohs (tmp16);
679 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
680 buffer += sizeof (tmp16);
681 pkg_length = ntohs (tmp16);
683 /* Check that packet fits in the input buffer */
684 if (pkg_length > buffer_len)
685 {
686 WARNING ("network plugin: parse_part_string: "
687 "Packet too big: "
688 "Chunk of size %hu received, "
689 "but buffer has only %i bytes left.",
690 pkg_length, buffer_len);
691 return (-1);
692 }
694 /* Check that pkg_length is in the valid range */
695 if (pkg_length <= header_size)
696 {
697 WARNING ("network plugin: parse_part_string: "
698 "Packet too short: "
699 "Header claims this packet is only %hu "
700 "bytes long.", pkg_length);
701 return (-1);
702 }
704 /* Check that the package data fits into the output buffer.
705 * The previous if-statement ensures that:
706 * `pkg_length > header_size' */
707 if ((output_len < 0)
708 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
709 {
710 WARNING ("network plugin: parse_part_string: "
711 "Output buffer too small.");
712 return (-1);
713 }
715 /* All sanity checks successfull, let's copy the data over */
716 output_len = pkg_length - header_size;
717 memcpy ((void *) output, (void *) buffer, output_len);
718 buffer += output_len;
720 /* For some very weird reason '\0' doesn't do the trick on SPARC in
721 * this statement. */
722 if (output[output_len - 1] != 0)
723 {
724 WARNING ("network plugin: parse_part_string: "
725 "Received string does not end "
726 "with a NULL-byte.");
727 return (-1);
728 }
730 *ret_buffer = buffer;
731 *ret_buffer_len = buffer_len - pkg_length;
733 return (0);
734 } /* int parse_part_string */
736 #if HAVE_GCRYPT_H
737 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
738 void **ret_buffer, int *ret_buffer_len)
739 {
740 char *buffer = *ret_buffer;
741 size_t buffer_len = (size_t) *ret_buffer_len;
743 part_signature_sha256_t ps_received;
744 char hash[sizeof (ps_received.hash)];
746 gcry_md_hd_t hd;
747 gcry_error_t err;
748 unsigned char *hash_ptr;
750 if (se->shared_secret == NULL)
751 {
752 NOTICE ("network plugin: Received signed network packet but can't verify "
753 "it because no shared secret has been configured. Will accept it.");
754 return (0);
755 }
757 if (buffer_len < sizeof (ps_received))
758 return (-ENOMEM);
760 hd = NULL;
761 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
762 if (err != 0)
763 {
764 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
765 gcry_strerror (err));
766 return (-1);
767 }
769 err = gcry_md_setkey (hd, se->shared_secret,
770 strlen (se->shared_secret));
771 if (err != 0)
772 {
773 ERROR ("network plugin: gcry_md_setkey failed: %s",
774 gcry_strerror (err));
775 gcry_md_close (hd);
776 return (-1);
777 }
779 memcpy (&ps_received, buffer, sizeof (ps_received));
780 /* TODO: Check ps_received.head.length! */
782 buffer += sizeof (ps_received);
783 buffer_len -= sizeof (ps_received);
785 gcry_md_write (hd, buffer, buffer_len);
786 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
787 if (hash_ptr == NULL)
788 {
789 ERROR ("network plugin: gcry_md_read failed.");
790 gcry_md_close (hd);
791 return (-1);
792 }
793 memcpy (hash, hash_ptr, sizeof (hash));
795 gcry_md_close (hd);
796 hd = NULL;
798 *ret_buffer += sizeof (ps_received);
799 *ret_buffer_len -= sizeof (ps_received);
801 if (memcmp (ps_received.hash, hash,
802 sizeof (ps_received.hash)) == 0)
803 return (0);
804 else /* hashes do not match. */
805 return (1);
806 } /* }}} int parse_part_sign_sha256 */
807 /* #endif HAVE_GCRYPT_H */
809 #else /* if !HAVE_GCRYPT_H */
810 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
811 void **ret_buffer, int *ret_buffer_len)
812 {
813 INFO ("network plugin: Received signed packet, but the network "
814 "plugin was not linked with libgcrypt, so I cannot "
815 "verify the signature. The packet will be accepted.");
816 return (0);
817 } /* }}} int parse_part_sign_sha256 */
818 #endif /* !HAVE_GCRYPT_H */
820 #if HAVE_GCRYPT_H
821 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
822 void **ret_buffer, int *ret_buffer_len)
823 {
824 char *buffer = *ret_buffer;
825 size_t buffer_len = (size_t) *ret_buffer_len;
826 size_t orig_buffer_len;
827 size_t part_size;
828 size_t buffer_offset = 0;
829 size_t padding_size;
830 part_encryption_aes256_t pea;
831 size_t pea_size;
832 char hash[sizeof (pea.hash)];
833 gcry_error_t err;
835 /* Make sure at least the header if available. */
836 if (buffer_len < sizeof (pea))
837 {
838 NOTICE ("network plugin: parse_part_encr_aes256: "
839 "Discarding short packet.");
840 return (-1);
841 }
843 if (se->cypher == NULL)
844 {
845 NOTICE ("network plugin: Unable to decrypt packet, because no cypher "
846 "instance is present.");
847 return (-1);
848 }
850 /* Size of `pea' without padding. */
851 pea_size = sizeof (pea.head.type) + sizeof (pea.head.length)
852 + sizeof (pea.orig_length) + sizeof (pea.hash);
854 /* Copy the header information to `pea' */
855 memcpy (&pea.head, buffer, sizeof (pea.head));
856 buffer_offset += sizeof (pea.head);
858 /* Check the `part size'. */
859 part_size = ntohs (pea.head.length);
860 if (part_size > buffer_len)
861 {
862 NOTICE ("network plugin: parse_part_encr_aes256: "
863 "Discarding large part.");
864 return (-1);
865 }
867 /* Decrypt the packet in-place */
868 err = gcry_cipher_decrypt (se->cypher,
869 buffer + sizeof (pea.head), part_size - sizeof (pea.head),
870 /* in = */ NULL, /* in len = */ 0);
871 gcry_cipher_reset (se->cypher);
872 if (err != 0)
873 {
874 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
875 gcry_strerror (err));
876 return (-1);
877 }
879 /* Figure out the length of the payload and the length of the padding. */
880 memcpy (&pea.orig_length, buffer + buffer_offset, sizeof (pea.orig_length));
881 buffer_offset += sizeof (pea.orig_length);
882 orig_buffer_len = ntohs (pea.orig_length);
883 if (orig_buffer_len > (part_size - pea_size))
884 {
885 ERROR ("network plugin: Decryption failed: Invalid original length.");
886 return (-1);
887 }
889 /* Calculate the size of the `padding' field. */
890 padding_size = part_size - (orig_buffer_len + pea_size);
891 if (padding_size > sizeof (pea.padding))
892 {
893 ERROR ("network plugin: Part- and original length "
894 "differ more than %zu bytes.", sizeof (pea.padding));
895 return (-1);
896 }
897 buffer_offset += padding_size;
899 memcpy (pea.hash, buffer + buffer_offset, sizeof (pea.hash));
900 buffer_offset += sizeof (pea.hash);
902 /* Check hash sum */
903 memset (hash, 0, sizeof (hash));
904 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
905 buffer + buffer_offset, orig_buffer_len);
907 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
908 {
909 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
910 return (-1);
911 }
913 assert ((buffer_offset + orig_buffer_len) <= buffer_len);
914 if ((buffer_offset + orig_buffer_len) < buffer_len)
915 {
916 NOTICE ("network plugin: Trailing, potentially unencrypted data "
917 "(%zu bytes) will be ignored.",
918 buffer_len - (buffer_offset + orig_buffer_len));
919 }
921 /* Update return values */
922 *ret_buffer = buffer + buffer_offset;
923 *ret_buffer_len = (int) orig_buffer_len;
925 return (0);
926 } /* }}} int parse_part_encr_aes256 */
927 /* #endif HAVE_GCRYPT_H */
929 #else /* if !HAVE_GCRYPT_H */
930 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
931 void **ret_buffer, int *ret_buffer_len)
932 {
933 INFO ("network plugin: Received encrypted packet, but the network "
934 "plugin was not linked with libgcrypt, so I cannot "
935 "decrypt it. The packet will be discarded.");
936 return (-1);
937 } /* }}} int parse_part_encr_aes256 */
938 #endif /* !HAVE_GCRYPT_H */
940 static int parse_packet (receive_list_entry_t *rle) /* {{{ */
941 {
942 int status;
944 void *buffer;
945 int buffer_len;
946 sockent_t *se;
948 value_list_t vl = VALUE_LIST_INIT;
949 notification_t n;
951 int packet_was_encrypted = 0;
952 int packet_was_signed = 0;
953 #if HAVE_GCRYPT_H
954 int printed_ignore_warning = 0;
955 #endif /* HAVE_GCRYPT_H */
957 buffer = rle->data;
958 buffer_len = rle->data_len;
960 /* Look for the correct `sockent_t' */
961 se = listen_sockets;
962 while ((se != NULL) && (se->fd != rle->fd))
963 se = se->next;
965 if (se == NULL)
966 {
967 ERROR ("network plugin: Got packet from FD %i, but can't "
968 "find an appropriate socket entry.",
969 rle->fd);
970 return (-1);
971 }
973 memset (&vl, '\0', sizeof (vl));
974 memset (&n, '\0', sizeof (n));
975 status = 0;
977 while ((status == 0) && (0 < buffer_len)
978 && ((unsigned int) buffer_len > sizeof (part_header_t)))
979 {
980 uint16_t pkg_length;
981 uint16_t pkg_type;
983 memcpy ((void *) &pkg_type,
984 (void *) buffer,
985 sizeof (pkg_type));
986 memcpy ((void *) &pkg_length,
987 (void *) (buffer + sizeof (pkg_type)),
988 sizeof (pkg_length));
990 pkg_length = ntohs (pkg_length);
991 pkg_type = ntohs (pkg_type);
993 if (pkg_length > buffer_len)
994 break;
995 /* Ensure that this loop terminates eventually */
996 if (pkg_length < (2 * sizeof (uint16_t)))
997 break;
999 if (pkg_type == TYPE_ENCR_AES256)
1000 {
1001 status = parse_part_encr_aes256 (se, &buffer, &buffer_len);
1002 if (status != 0)
1003 {
1004 ERROR ("network plugin: Decrypting AES256 "
1005 "part failed "
1006 "with status %i.", status);
1007 break;
1008 }
1009 else
1010 {
1011 packet_was_encrypted = 1;
1012 }
1013 }
1014 #if HAVE_GCRYPT_H
1015 else if ((se->security_level == SECURITY_LEVEL_ENCRYPT)
1016 && (packet_was_encrypted == 0))
1017 {
1018 if (printed_ignore_warning == 0)
1019 {
1020 INFO ("network plugin: Unencrypted packet or "
1021 "part has been ignored.");
1022 printed_ignore_warning = 1;
1023 }
1024 buffer = ((char *) buffer) + pkg_length;
1025 continue;
1026 }
1027 #endif /* HAVE_GCRYPT_H */
1028 else if (pkg_type == TYPE_SIGN_SHA256)
1029 {
1030 status = parse_part_sign_sha256 (se, &buffer, &buffer_len);
1031 if (status < 0)
1032 {
1033 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1034 "signature failed "
1035 "with status %i.", status);
1036 break;
1037 }
1038 else if (status > 0)
1039 {
1040 ERROR ("network plugin: Ignoring packet with "
1041 "invalid HMAC-SHA-256 signature.");
1042 break;
1043 }
1044 else
1045 {
1046 packet_was_signed = 1;
1047 }
1048 }
1049 #if HAVE_GCRYPT_H
1050 else if ((se->security_level == SECURITY_LEVEL_SIGN)
1051 && (packet_was_encrypted == 0)
1052 && (packet_was_signed == 0))
1053 {
1054 if (printed_ignore_warning == 0)
1055 {
1056 INFO ("network plugin: Unsigned packet or "
1057 "part has been ignored.");
1058 printed_ignore_warning = 1;
1059 }
1060 buffer = ((char *) buffer) + pkg_length;
1061 continue;
1062 }
1063 #endif /* HAVE_GCRYPT_H */
1064 else if (pkg_type == TYPE_VALUES)
1065 {
1066 status = parse_part_values (&buffer, &buffer_len,
1067 &vl.values, &vl.values_len);
1069 if (status != 0)
1070 break;
1072 if ((vl.time > 0)
1073 && (strlen (vl.host) > 0)
1074 && (strlen (vl.plugin) > 0)
1075 && (strlen (vl.type) > 0)
1076 && (cache_check (&vl) == 0))
1077 {
1078 plugin_dispatch_values (&vl);
1079 }
1080 else
1081 {
1082 DEBUG ("network plugin: parse_packet:"
1083 " NOT dispatching values");
1084 }
1086 sfree (vl.values);
1087 }
1088 else if (pkg_type == TYPE_TIME)
1089 {
1090 uint64_t tmp = 0;
1091 status = parse_part_number (&buffer, &buffer_len,
1092 &tmp);
1093 if (status == 0)
1094 {
1095 vl.time = (time_t) tmp;
1096 n.time = (time_t) tmp;
1097 }
1098 }
1099 else if (pkg_type == TYPE_INTERVAL)
1100 {
1101 uint64_t tmp = 0;
1102 status = parse_part_number (&buffer, &buffer_len,
1103 &tmp);
1104 if (status == 0)
1105 vl.interval = (int) tmp;
1106 }
1107 else if (pkg_type == TYPE_HOST)
1108 {
1109 status = parse_part_string (&buffer, &buffer_len,
1110 vl.host, sizeof (vl.host));
1111 if (status == 0)
1112 sstrncpy (n.host, vl.host, sizeof (n.host));
1113 }
1114 else if (pkg_type == TYPE_PLUGIN)
1115 {
1116 status = parse_part_string (&buffer, &buffer_len,
1117 vl.plugin, sizeof (vl.plugin));
1118 if (status == 0)
1119 sstrncpy (n.plugin, vl.plugin,
1120 sizeof (n.plugin));
1121 }
1122 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1123 {
1124 status = parse_part_string (&buffer, &buffer_len,
1125 vl.plugin_instance,
1126 sizeof (vl.plugin_instance));
1127 if (status == 0)
1128 sstrncpy (n.plugin_instance,
1129 vl.plugin_instance,
1130 sizeof (n.plugin_instance));
1131 }
1132 else if (pkg_type == TYPE_TYPE)
1133 {
1134 status = parse_part_string (&buffer, &buffer_len,
1135 vl.type, sizeof (vl.type));
1136 if (status == 0)
1137 sstrncpy (n.type, vl.type, sizeof (n.type));
1138 }
1139 else if (pkg_type == TYPE_TYPE_INSTANCE)
1140 {
1141 status = parse_part_string (&buffer, &buffer_len,
1142 vl.type_instance,
1143 sizeof (vl.type_instance));
1144 if (status == 0)
1145 sstrncpy (n.type_instance, vl.type_instance,
1146 sizeof (n.type_instance));
1147 }
1148 else if (pkg_type == TYPE_MESSAGE)
1149 {
1150 status = parse_part_string (&buffer, &buffer_len,
1151 n.message, sizeof (n.message));
1153 if (status != 0)
1154 {
1155 /* do nothing */
1156 }
1157 else if ((n.severity != NOTIF_FAILURE)
1158 && (n.severity != NOTIF_WARNING)
1159 && (n.severity != NOTIF_OKAY))
1160 {
1161 INFO ("network plugin: "
1162 "Ignoring notification with "
1163 "unknown severity %i.",
1164 n.severity);
1165 }
1166 else if (n.time <= 0)
1167 {
1168 INFO ("network plugin: "
1169 "Ignoring notification with "
1170 "time == 0.");
1171 }
1172 else if (strlen (n.message) <= 0)
1173 {
1174 INFO ("network plugin: "
1175 "Ignoring notification with "
1176 "an empty message.");
1177 }
1178 else
1179 {
1180 plugin_dispatch_notification (&n);
1181 }
1182 }
1183 else if (pkg_type == TYPE_SEVERITY)
1184 {
1185 uint64_t tmp = 0;
1186 status = parse_part_number (&buffer, &buffer_len,
1187 &tmp);
1188 if (status == 0)
1189 n.severity = (int) tmp;
1190 }
1191 else
1192 {
1193 DEBUG ("network plugin: parse_packet: Unknown part"
1194 " type: 0x%04hx", pkg_type);
1195 buffer = ((char *) buffer) + pkg_length;
1196 }
1197 } /* while (buffer_len > sizeof (part_header_t)) */
1199 return (status);
1200 } /* }}} int parse_packet */
1202 static void free_sockent (sockent_t *se) /* {{{ */
1203 {
1204 sockent_t *next;
1205 while (se != NULL)
1206 {
1207 next = se->next;
1209 #if HAVE_GCRYPT_H
1210 if (se->cypher != NULL)
1211 {
1212 gcry_cipher_close (se->cypher);
1213 se->cypher = NULL;
1214 }
1215 free (se->shared_secret);
1216 #endif /* HAVE_GCRYPT_H */
1218 free (se->addr);
1219 free (se);
1221 se = next;
1222 }
1223 } /* }}} void free_sockent */
1225 /*
1226 * int network_set_ttl
1227 *
1228 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1229 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1230 *
1231 * The `struct addrinfo' is used to destinguish between unicast and multicast
1232 * sockets.
1233 */
1234 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1235 {
1236 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1237 network_config_ttl);
1239 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1240 return (-1);
1242 if (ai->ai_family == AF_INET)
1243 {
1244 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1245 int optname;
1247 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1248 optname = IP_MULTICAST_TTL;
1249 else
1250 optname = IP_TTL;
1252 if (setsockopt (se->fd, IPPROTO_IP, optname,
1253 &network_config_ttl,
1254 sizeof (network_config_ttl)) == -1)
1255 {
1256 char errbuf[1024];
1257 ERROR ("setsockopt: %s",
1258 sstrerror (errno, errbuf, sizeof (errbuf)));
1259 return (-1);
1260 }
1261 }
1262 else if (ai->ai_family == AF_INET6)
1263 {
1264 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1265 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1266 int optname;
1268 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1269 optname = IPV6_MULTICAST_HOPS;
1270 else
1271 optname = IPV6_UNICAST_HOPS;
1273 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
1274 &network_config_ttl,
1275 sizeof (network_config_ttl)) == -1)
1276 {
1277 char errbuf[1024];
1278 ERROR ("setsockopt: %s",
1279 sstrerror (errno, errbuf,
1280 sizeof (errbuf)));
1281 return (-1);
1282 }
1283 }
1285 return (0);
1286 } /* int network_set_ttl */
1288 #if HAVE_GCRYPT_H
1289 static int network_set_encryption (sockent_t *se, /* {{{ */
1290 const char *shared_secret)
1291 {
1292 char hash[32];
1293 gcry_error_t err;
1295 se->shared_secret = sstrdup (shared_secret);
1297 /*
1298 * We use CBC *without* an initialization vector: The cipher is reset after
1299 * each packet and we would have to re-set the IV each time. The first
1300 * encrypted block will contain the SHA-224 checksum anyway, so this should
1301 * be quite unpredictable. Also, there's a 2 byte field in the header that's
1302 * being filled with random numbers. So we only use CBC so the blocks
1303 * *within* one packet are chained.
1304 */
1305 err = gcry_cipher_open (&se->cypher,
1306 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC, /* flags = */ 0);
1307 if (err != 0)
1308 {
1309 ERROR ("network plugin: gcry_cipher_open returned: %s",
1310 gcry_strerror (err));
1311 return (-1);
1312 }
1314 assert (se->shared_secret != NULL);
1315 gcry_md_hash_buffer (GCRY_MD_SHA256, hash,
1316 se->shared_secret, strlen (se->shared_secret));
1318 err = gcry_cipher_setkey (se->cypher, hash, sizeof (hash));
1319 if (err != 0)
1320 {
1321 DEBUG ("network plugin: gcry_cipher_setkey returned: %s",
1322 gcry_strerror (err));
1323 gcry_cipher_close (se->cypher);
1324 se->cypher = NULL;
1325 return (-1);
1326 }
1328 return (0);
1329 } /* }}} int network_set_encryption */
1330 #endif /* HAVE_GCRYPT_H */
1332 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
1333 {
1334 int loop = 0;
1335 int yes = 1;
1337 /* allow multiple sockets to use the same PORT number */
1338 if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR,
1339 &yes, sizeof(yes)) == -1) {
1340 char errbuf[1024];
1341 ERROR ("setsockopt: %s",
1342 sstrerror (errno, errbuf, sizeof (errbuf)));
1343 return (-1);
1344 }
1346 DEBUG ("fd = %i; calling `bind'", se->fd);
1348 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
1349 {
1350 char errbuf[1024];
1351 ERROR ("bind: %s",
1352 sstrerror (errno, errbuf, sizeof (errbuf)));
1353 return (-1);
1354 }
1356 if (ai->ai_family == AF_INET)
1357 {
1358 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1359 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1360 {
1361 struct ip_mreq mreq;
1363 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
1365 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1366 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
1368 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1369 &loop, sizeof (loop)) == -1)
1370 {
1371 char errbuf[1024];
1372 ERROR ("setsockopt: %s",
1373 sstrerror (errno, errbuf,
1374 sizeof (errbuf)));
1375 return (-1);
1376 }
1378 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1379 &mreq, sizeof (mreq)) == -1)
1380 {
1381 char errbuf[1024];
1382 ERROR ("setsockopt: %s",
1383 sstrerror (errno, errbuf,
1384 sizeof (errbuf)));
1385 return (-1);
1386 }
1387 }
1388 }
1389 else if (ai->ai_family == AF_INET6)
1390 {
1391 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1392 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1393 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1394 {
1395 struct ipv6_mreq mreq;
1397 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
1399 memcpy (&mreq.ipv6mr_multiaddr,
1400 &addr->sin6_addr,
1401 sizeof (addr->sin6_addr));
1403 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1404 * ipv6mr_interface may be set to zeroes to
1405 * choose the default multicast interface or to
1406 * the index of a particular multicast-capable
1407 * interface if the host is multihomed.
1408 * Membership is associ-associated with a
1409 * single interface; programs running on
1410 * multihomed hosts may need to join the same
1411 * group on more than one interface.*/
1412 mreq.ipv6mr_interface = 0;
1414 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1415 &loop, sizeof (loop)) == -1)
1416 {
1417 char errbuf[1024];
1418 ERROR ("setsockopt: %s",
1419 sstrerror (errno, errbuf,
1420 sizeof (errbuf)));
1421 return (-1);
1422 }
1424 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1425 &mreq, sizeof (mreq)) == -1)
1426 {
1427 char errbuf[1024];
1428 ERROR ("setsockopt: %s",
1429 sstrerror (errno, errbuf,
1430 sizeof (errbuf)));
1431 return (-1);
1432 }
1433 }
1434 }
1436 return (0);
1437 } /* int network_bind_socket */
1439 #define CREATE_SOCKET_FLAGS_LISTEN 0x0001
1440 static sockent_t *network_create_socket (const char *node, /* {{{ */
1441 const char *service,
1442 const char *shared_secret,
1443 int security_level,
1444 int flags)
1445 {
1446 struct addrinfo ai_hints;
1447 struct addrinfo *ai_list, *ai_ptr;
1448 int ai_return;
1450 sockent_t *se_head = NULL;
1451 sockent_t *se_tail = NULL;
1453 DEBUG ("node = %s, service = %s", node, service);
1455 memset (&ai_hints, '\0', sizeof (ai_hints));
1456 ai_hints.ai_flags = 0;
1457 #ifdef AI_PASSIVE
1458 ai_hints.ai_flags |= AI_PASSIVE;
1459 #endif
1460 #ifdef AI_ADDRCONFIG
1461 ai_hints.ai_flags |= AI_ADDRCONFIG;
1462 #endif
1463 ai_hints.ai_family = AF_UNSPEC;
1464 ai_hints.ai_socktype = SOCK_DGRAM;
1465 ai_hints.ai_protocol = IPPROTO_UDP;
1467 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1468 if (ai_return != 0)
1469 {
1470 char errbuf[1024];
1471 ERROR ("getaddrinfo (%s, %s): %s",
1472 (node == NULL) ? "(null)" : node,
1473 (service == NULL) ? "(null)" : service,
1474 (ai_return == EAI_SYSTEM)
1475 ? sstrerror (errno, errbuf, sizeof (errbuf))
1476 : gai_strerror (ai_return));
1477 return (NULL);
1478 }
1480 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1481 {
1482 sockent_t *se;
1483 int status;
1485 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
1486 {
1487 char errbuf[1024];
1488 ERROR ("malloc: %s",
1489 sstrerror (errno, errbuf,
1490 sizeof (errbuf)));
1491 continue;
1492 }
1494 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
1495 {
1496 char errbuf[1024];
1497 ERROR ("malloc: %s",
1498 sstrerror (errno, errbuf,
1499 sizeof (errbuf)));
1500 free (se);
1501 continue;
1502 }
1504 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1505 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
1506 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1507 se->addrlen = ai_ptr->ai_addrlen;
1509 se->fd = socket (ai_ptr->ai_family,
1510 ai_ptr->ai_socktype,
1511 ai_ptr->ai_protocol);
1512 se->next = NULL;
1514 if (se->fd == -1)
1515 {
1516 char errbuf[1024];
1517 ERROR ("socket: %s",
1518 sstrerror (errno, errbuf,
1519 sizeof (errbuf)));
1520 free (se->addr);
1521 free (se);
1522 continue;
1523 }
1525 if ((flags & CREATE_SOCKET_FLAGS_LISTEN) != 0)
1526 {
1527 status = network_bind_socket (se, ai_ptr);
1528 if (status != 0)
1529 {
1530 close (se->fd);
1531 free (se->addr);
1532 free (se);
1533 continue;
1534 }
1535 }
1536 else /* sending socket */
1537 {
1538 network_set_ttl (se, ai_ptr);
1539 }
1541 #if HAVE_GCRYPT_H
1542 se->security_level = security_level;
1543 se->shared_secret = NULL;
1544 se->cypher = NULL;
1545 if (shared_secret != NULL)
1546 {
1547 status = network_set_encryption (se, shared_secret);
1548 if ((status != 0) && (security_level <= SECURITY_LEVEL_SIGN))
1549 {
1550 WARNING ("network plugin: Starting cryptograp"
1551 "hic subsystem failed. Since "
1552 "security level `Sign' or "
1553 "`None' is configured I will "
1554 "continue.");
1555 }
1556 else if (status != 0)
1557 {
1558 ERROR ("network plugin: Starting cryptograp"
1559 "hic subsystem failed. "
1560 "Because the security level "
1561 "is set to `Encrypt' I will "
1562 "not continue!");
1563 close (se->fd);
1564 free (se->addr);
1565 free (se);
1566 continue;
1567 }
1568 } /* if (shared_secret != NULL) */
1569 #else
1570 /* Make compiler happy */
1571 security_level = 0;
1572 shared_secret = NULL;
1573 #endif /* HAVE_GCRYPT_H */
1575 if (se_tail == NULL)
1576 {
1577 se_head = se;
1578 se_tail = se;
1579 }
1580 else
1581 {
1582 se_tail->next = se;
1583 se_tail = se;
1584 }
1586 /* We don't open more than one write-socket per node/service pair.. */
1587 if ((flags & CREATE_SOCKET_FLAGS_LISTEN) == 0)
1588 break;
1589 }
1591 freeaddrinfo (ai_list);
1593 return (se_head);
1594 } /* }}} sockent_t *network_create_socket */
1596 static sockent_t *network_create_default_socket (int flags) /* {{{ */
1597 {
1598 sockent_t *se_ptr = NULL;
1599 sockent_t *se_head = NULL;
1600 sockent_t *se_tail = NULL;
1602 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR, NET_DEFAULT_PORT,
1603 /* shared secret = */ NULL, SECURITY_LEVEL_NONE,
1604 flags);
1606 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
1607 if (((flags & CREATE_SOCKET_FLAGS_LISTEN) == 0) && (se_ptr != NULL))
1608 return (se_ptr);
1610 if (se_ptr != NULL)
1611 {
1612 se_head = se_ptr;
1613 se_tail = se_ptr;
1614 while (se_tail->next != NULL)
1615 se_tail = se_tail->next;
1616 }
1618 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT,
1619 /* shared secret = */ NULL, SECURITY_LEVEL_NONE,
1620 flags);
1622 if (se_tail == NULL)
1623 return (se_ptr);
1625 se_tail->next = se_ptr;
1626 return (se_head);
1627 } /* }}} sockent_t *network_create_default_socket */
1629 static int network_add_listen_socket (const char *node, /* {{{ */
1630 const char *service, const char *shared_secret, int security_level)
1631 {
1632 sockent_t *se;
1633 sockent_t *se_ptr;
1634 int se_num = 0;
1636 int flags;
1638 flags = CREATE_SOCKET_FLAGS_LISTEN;
1640 if (service == NULL)
1641 service = NET_DEFAULT_PORT;
1643 if (node == NULL)
1644 se = network_create_default_socket (flags);
1645 else
1646 se = network_create_socket (node, service,
1647 shared_secret, security_level, flags);
1649 if (se == NULL)
1650 return (-1);
1652 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1653 se_num++;
1655 listen_sockets_pollfd = realloc (listen_sockets_pollfd,
1656 (listen_sockets_num + se_num)
1657 * sizeof (struct pollfd));
1659 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1660 {
1661 listen_sockets_pollfd[listen_sockets_num].fd = se_ptr->fd;
1662 listen_sockets_pollfd[listen_sockets_num].events = POLLIN | POLLPRI;
1663 listen_sockets_pollfd[listen_sockets_num].revents = 0;
1664 listen_sockets_num++;
1665 } /* for (se) */
1667 se_ptr = listen_sockets;
1668 while ((se_ptr != NULL) && (se_ptr->next != NULL))
1669 se_ptr = se_ptr->next;
1671 if (se_ptr == NULL)
1672 listen_sockets = se;
1673 else
1674 se_ptr->next = se;
1676 return (0);
1677 } /* }}} int network_add_listen_socket */
1679 static int network_add_sending_socket (const char *node, /* {{{ */
1680 const char *service, const char *shared_secret, int security_level)
1681 {
1682 sockent_t *se;
1683 sockent_t *se_ptr;
1685 if (service == NULL)
1686 service = NET_DEFAULT_PORT;
1688 if (node == NULL)
1689 se = network_create_default_socket (/* flags = */ 0);
1690 else
1691 se = network_create_socket (node, service,
1692 shared_secret, security_level,
1693 /* flags = */ 0);
1695 if (se == NULL)
1696 return (-1);
1698 if (sending_sockets == NULL)
1699 {
1700 sending_sockets = se;
1701 return (0);
1702 }
1704 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
1705 /* seek end */;
1707 se_ptr->next = se;
1708 return (0);
1709 } /* }}} int network_add_sending_socket */
1711 static void *dispatch_thread (void __attribute__((unused)) *arg)
1712 {
1713 while (42)
1714 {
1715 receive_list_entry_t *ent;
1717 /* Lock and wait for more data to come in */
1718 pthread_mutex_lock (&receive_list_lock);
1719 while ((listen_loop == 0)
1720 && (receive_list_head == NULL))
1721 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1723 /* Remove the head entry and unlock */
1724 ent = receive_list_head;
1725 if (ent != NULL)
1726 receive_list_head = ent->next;
1727 pthread_mutex_unlock (&receive_list_lock);
1729 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1730 * because we dispatch all missing packets before shutting down. */
1731 if (ent == NULL)
1732 break;
1734 parse_packet (ent);
1736 sfree (ent);
1737 } /* while (42) */
1739 return (NULL);
1740 } /* void *dispatch_thread */
1742 static int network_receive (void)
1743 {
1744 char buffer[BUFF_SIZE];
1745 int buffer_len;
1747 int i;
1748 int status;
1750 receive_list_entry_t *private_list_head;
1751 receive_list_entry_t *private_list_tail;
1753 if (listen_sockets_num == 0)
1754 network_add_listen_socket (/* node = */ NULL,
1755 /* service = */ NULL,
1756 /* shared secret = */ NULL,
1757 /* encryption = */ 0);
1759 if (listen_sockets_num == 0)
1760 {
1761 ERROR ("network: Failed to open a listening socket.");
1762 return (-1);
1763 }
1765 private_list_head = NULL;
1766 private_list_tail = NULL;
1768 while (listen_loop == 0)
1769 {
1770 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
1772 if (status <= 0)
1773 {
1774 char errbuf[1024];
1775 if (errno == EINTR)
1776 continue;
1777 ERROR ("poll failed: %s",
1778 sstrerror (errno, errbuf, sizeof (errbuf)));
1779 return (-1);
1780 }
1782 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1783 {
1784 receive_list_entry_t *ent;
1786 if ((listen_sockets_pollfd[i].revents
1787 & (POLLIN | POLLPRI)) == 0)
1788 continue;
1789 status--;
1791 buffer_len = recv (listen_sockets_pollfd[i].fd,
1792 buffer, sizeof (buffer),
1793 0 /* no flags */);
1794 if (buffer_len < 0)
1795 {
1796 char errbuf[1024];
1797 ERROR ("recv failed: %s",
1798 sstrerror (errno, errbuf,
1799 sizeof (errbuf)));
1800 return (-1);
1801 }
1803 /* TODO: Possible performance enhancement: Do not free
1804 * these entries in the dispatch thread but put them in
1805 * another list, so we don't have to allocate more and
1806 * more of these structures. */
1807 ent = malloc (sizeof (receive_list_entry_t));
1808 if (ent == NULL)
1809 {
1810 ERROR ("network plugin: malloc failed.");
1811 return (-1);
1812 }
1813 memset (ent, 0, sizeof (receive_list_entry_t));
1814 ent->fd = listen_sockets_pollfd[i].fd;
1815 ent->next = NULL;
1817 /* Hopefully this be optimized out by the compiler. It
1818 * might help prevent stupid bugs in the future though.
1819 */
1820 assert (sizeof (ent->data) == sizeof (buffer));
1822 memcpy (ent->data, buffer, buffer_len);
1823 ent->data_len = buffer_len;
1825 if (private_list_head == NULL)
1826 private_list_head = ent;
1827 else
1828 private_list_tail->next = ent;
1829 private_list_tail = ent;
1831 /* Do not block here. Blocking here has led to
1832 * insufficient performance in the past. */
1833 if (pthread_mutex_trylock (&receive_list_lock) == 0)
1834 {
1835 if (receive_list_head == NULL)
1836 receive_list_head = private_list_head;
1837 else
1838 receive_list_tail->next = private_list_head;
1839 receive_list_tail = private_list_tail;
1841 private_list_head = NULL;
1842 private_list_tail = NULL;
1844 pthread_cond_signal (&receive_list_cond);
1845 pthread_mutex_unlock (&receive_list_lock);
1846 }
1847 } /* for (listen_sockets_pollfd) */
1848 } /* while (listen_loop == 0) */
1850 /* Make sure everything is dispatched before exiting. */
1851 if (private_list_head != NULL)
1852 {
1853 pthread_mutex_lock (&receive_list_lock);
1855 if (receive_list_head == NULL)
1856 receive_list_head = private_list_head;
1857 else
1858 receive_list_tail->next = private_list_head;
1859 receive_list_tail = private_list_tail;
1861 private_list_head = NULL;
1862 private_list_tail = NULL;
1864 pthread_cond_signal (&receive_list_cond);
1865 pthread_mutex_unlock (&receive_list_lock);
1866 }
1868 return (0);
1869 } /* int network_receive */
1871 static void *receive_thread (void __attribute__((unused)) *arg)
1872 {
1873 return (network_receive () ? (void *) 1 : (void *) 0);
1874 } /* void *receive_thread */
1876 static void network_init_buffer (void)
1877 {
1878 memset (send_buffer, 0, sizeof (send_buffer));
1879 send_buffer_ptr = send_buffer;
1880 send_buffer_fill = 0;
1882 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
1883 } /* int network_init_buffer */
1885 static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */
1886 const char *buffer, size_t buffer_size)
1887 {
1888 int status;
1890 while (42)
1891 {
1892 status = sendto (se->fd, buffer, buffer_size, 0 /* no flags */,
1893 (struct sockaddr *) se->addr, se->addrlen);
1894 if (status < 0)
1895 {
1896 char errbuf[1024];
1897 if (errno == EINTR)
1898 continue;
1899 ERROR ("network plugin: sendto failed: %s",
1900 sstrerror (errno, errbuf,
1901 sizeof (errbuf)));
1902 break;
1903 }
1905 break;
1906 } /* while (42) */
1907 } /* }}} void networt_send_buffer_plain */
1909 #if HAVE_GCRYPT_H
1910 static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */
1911 const char *in_buffer, size_t in_buffer_size)
1912 {
1913 part_signature_sha256_t ps;
1914 char buffer[sizeof (ps) + in_buffer_size];
1916 gcry_md_hd_t hd;
1917 gcry_error_t err;
1918 unsigned char *hash;
1920 hd = NULL;
1921 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
1922 if (err != 0)
1923 {
1924 ERROR ("network plugin: Creating HMAC object failed: %s",
1925 gcry_strerror (err));
1926 return;
1927 }
1929 err = gcry_md_setkey (hd, se->shared_secret,
1930 strlen (se->shared_secret));
1931 if (err != 0)
1932 {
1933 ERROR ("network plugin: gcry_md_setkey failed: %s",
1934 gcry_strerror (err));
1935 gcry_md_close (hd);
1936 return;
1937 }
1939 /* Initialize the `ps' structure. */
1940 memset (&ps, 0, sizeof (ps));
1941 ps.head.type = htons (TYPE_SIGN_SHA256);
1942 ps.head.length = htons ((uint16_t) sizeof (ps));
1944 /* Calculate the hash value. */
1945 gcry_md_write (hd, in_buffer, in_buffer_size);
1946 hash = gcry_md_read (hd, GCRY_MD_SHA256);
1947 if (hash == NULL)
1948 {
1949 ERROR ("network plugin: gcry_md_read failed.");
1950 gcry_md_close (hd);
1951 return;
1952 }
1954 /* Add the signature and fill the rest of the buffer. */
1955 memcpy (ps.hash, hash, sizeof (ps.hash));
1956 memcpy (buffer, &ps, sizeof (ps));
1957 memcpy (buffer + sizeof (ps), in_buffer, in_buffer_size);
1959 gcry_md_close (hd);
1960 hd = NULL;
1962 networt_send_buffer_plain (se, buffer, sizeof (buffer));
1963 } /* }}} void networt_send_buffer_signed */
1965 static void networt_send_buffer_encrypted (const sockent_t *se, /* {{{ */
1966 const char *in_buffer, size_t in_buffer_size)
1967 {
1968 part_encryption_aes256_t pea;
1969 char buffer[sizeof (pea) + in_buffer_size];
1970 size_t buffer_size;
1971 size_t buffer_offset;
1972 size_t padding_size;
1973 gcry_error_t err;
1975 /* Round to the next multiple of 16, because AES has a block size of 128 bit.
1976 * the first four bytes of `pea' are not encrypted and must be subtracted. */
1977 buffer_size = sizeof (pea.orig_length) + sizeof (pea.hash) + in_buffer_size;
1978 padding_size = buffer_size;
1979 buffer_size = (buffer_size + 15) / 16;
1980 buffer_size = buffer_size * 16;
1981 padding_size = buffer_size - padding_size;
1982 assert (padding_size <= sizeof (pea.padding));
1983 buffer_size += sizeof (pea.head);
1985 DEBUG ("network plugin: networt_send_buffer_encrypted: "
1986 "buffer_size = %zu;", buffer_size);
1988 /* Initialize the header fields */
1989 memset (&pea, 0, sizeof (pea));
1990 pea.head.type = htons (TYPE_ENCR_AES256);
1991 pea.head.length = htons ((uint16_t) buffer_size);
1992 pea.orig_length = htons ((uint16_t) in_buffer_size);
1994 /* Fill the extra field with random values. Some entropy in the encrypted
1995 * data is usually not a bad thing, I hope. */
1996 if (padding_size > 0)
1997 gcry_randomize (&pea.padding, padding_size, GCRY_STRONG_RANDOM);
1999 /* Create hash of the payload */
2000 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2002 /* Initialize the buffer */
2003 buffer_offset = 0;
2004 memset (buffer, 0, sizeof (buffer));
2006 memcpy (buffer + buffer_offset, &pea.head, sizeof (pea.head));
2007 buffer_offset += sizeof (pea.head);
2009 memcpy (buffer + buffer_offset, &pea.orig_length, sizeof (pea.orig_length));
2010 buffer_offset += sizeof (pea.orig_length);
2012 if (padding_size > 0)
2013 {
2014 memcpy (buffer + buffer_offset, &pea.padding, padding_size);
2015 buffer_offset += padding_size;
2016 }
2018 memcpy (buffer + buffer_offset, &pea.hash, sizeof (pea.hash));
2019 buffer_offset += sizeof (pea.hash);
2021 memcpy (buffer + buffer_offset, in_buffer, in_buffer_size);
2022 buffer_offset += in_buffer_size;
2024 assert (buffer_offset == buffer_size);
2026 /* Encrypt the buffer in-place */
2027 err = gcry_cipher_encrypt (se->cypher,
2028 buffer + sizeof (pea.head), buffer_size - sizeof (pea.head),
2029 /* in = */ NULL, /* in len = */ 0);
2030 gcry_cipher_reset (se->cypher);
2031 if (err != 0)
2032 {
2033 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2034 gcry_strerror (err));
2035 return;
2036 }
2038 /* Send it out without further modifications */
2039 networt_send_buffer_plain (se, buffer, buffer_size);
2040 } /* }}} void networt_send_buffer_encrypted */
2041 #endif /* HAVE_GCRYPT_H */
2043 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2044 {
2045 sockent_t *se;
2047 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2049 for (se = sending_sockets; se != NULL; se = se->next)
2050 {
2051 #if HAVE_GCRYPT_H
2052 if (se->security_level == SECURITY_LEVEL_ENCRYPT)
2053 networt_send_buffer_encrypted (se, buffer, buffer_len);
2054 else if (se->security_level == SECURITY_LEVEL_SIGN)
2055 networt_send_buffer_signed (se, buffer, buffer_len);
2056 else /* if (se->security_level == SECURITY_LEVEL_NONE) */
2057 #endif /* HAVE_GCRYPT_H */
2058 networt_send_buffer_plain (se, buffer, buffer_len);
2059 } /* for (sending_sockets) */
2060 } /* }}} void network_send_buffer */
2062 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
2063 value_list_t *vl_def,
2064 const data_set_t *ds, const value_list_t *vl)
2065 {
2066 char *buffer_orig = buffer;
2068 if (strcmp (vl_def->host, vl->host) != 0)
2069 {
2070 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2071 vl->host, strlen (vl->host)) != 0)
2072 return (-1);
2073 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2074 }
2076 if (vl_def->time != vl->time)
2077 {
2078 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
2079 (uint64_t) vl->time))
2080 return (-1);
2081 vl_def->time = vl->time;
2082 }
2084 if (vl_def->interval != vl->interval)
2085 {
2086 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
2087 (uint64_t) vl->interval))
2088 return (-1);
2089 vl_def->interval = vl->interval;
2090 }
2092 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2093 {
2094 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2095 vl->plugin, strlen (vl->plugin)) != 0)
2096 return (-1);
2097 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2098 }
2100 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2101 {
2102 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2103 vl->plugin_instance,
2104 strlen (vl->plugin_instance)) != 0)
2105 return (-1);
2106 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2107 }
2109 if (strcmp (vl_def->type, vl->type) != 0)
2110 {
2111 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2112 vl->type, strlen (vl->type)) != 0)
2113 return (-1);
2114 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2115 }
2117 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2118 {
2119 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2120 vl->type_instance,
2121 strlen (vl->type_instance)) != 0)
2122 return (-1);
2123 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2124 }
2126 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2127 return (-1);
2129 return (buffer - buffer_orig);
2130 } /* }}} int add_to_buffer */
2132 static void flush_buffer (void)
2133 {
2134 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2135 send_buffer_fill);
2137 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2138 network_init_buffer ();
2139 }
2141 static int network_write (const data_set_t *ds, const value_list_t *vl,
2142 user_data_t __attribute__((unused)) *user_data)
2143 {
2144 int status;
2146 /* If the value is already in the cache, we have received it via the
2147 * network. We write it again if forwarding is activated. It's then in
2148 * the cache and should we receive it again we will ignore it. */
2149 status = cache_check (vl);
2150 if ((network_config_forward == 0)
2151 && (status != 0))
2152 return (0);
2154 pthread_mutex_lock (&send_buffer_lock);
2156 status = add_to_buffer (send_buffer_ptr,
2157 sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
2158 &send_buffer_vl,
2159 ds, vl);
2160 if (status >= 0)
2161 {
2162 /* status == bytes added to the buffer */
2163 send_buffer_fill += status;
2164 send_buffer_ptr += status;
2165 }
2166 else
2167 {
2168 flush_buffer ();
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);
2175 if (status >= 0)
2176 {
2177 send_buffer_fill += status;
2178 send_buffer_ptr += status;
2179 }
2180 }
2182 if (status < 0)
2183 {
2184 ERROR ("network plugin: Unable to append to the "
2185 "buffer for some weird reason");
2186 }
2187 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
2188 {
2189 flush_buffer ();
2190 }
2192 pthread_mutex_unlock (&send_buffer_lock);
2194 return ((status < 0) ? -1 : 0);
2195 } /* int network_write */
2197 static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
2198 int *retval)
2199 {
2200 if ((ci->values_num != 1)
2201 || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
2202 && (ci->values[0].type != OCONFIG_TYPE_STRING)))
2203 {
2204 ERROR ("network plugin: The `%s' config option needs "
2205 "exactly one boolean argument.", ci->key);
2206 return (-1);
2207 }
2209 if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
2210 {
2211 if (ci->values[0].value.boolean)
2212 *retval = 1;
2213 else
2214 *retval = 0;
2215 }
2216 else
2217 {
2218 char *str = ci->values[0].value.string;
2220 if ((strcasecmp ("true", str) == 0)
2221 || (strcasecmp ("yes", str) == 0)
2222 || (strcasecmp ("on", str) == 0))
2223 *retval = 1;
2224 else if ((strcasecmp ("false", str) == 0)
2225 || (strcasecmp ("no", str) == 0)
2226 || (strcasecmp ("off", str) == 0))
2227 *retval = 0;
2228 else
2229 {
2230 ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
2231 "option as boolean value.",
2232 str, ci->key);
2233 return (-1);
2234 }
2235 }
2237 return (0);
2238 } /* }}} int network_config_set_boolean */
2240 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2241 {
2242 int tmp;
2243 if ((ci->values_num != 1)
2244 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2245 {
2246 WARNING ("network plugin: The `TimeToLive' config option needs exactly "
2247 "one numeric argument.");
2248 return (-1);
2249 }
2251 tmp = (int) ci->values[0].value.number;
2252 if ((tmp > 0) && (tmp <= 255))
2253 network_config_ttl = tmp;
2255 return (0);
2256 } /* }}} int network_config_set_ttl */
2258 #if HAVE_GCRYPT_H
2259 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
2260 int *retval)
2261 {
2262 char *str;
2263 if ((ci->values_num != 1)
2264 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2265 {
2266 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
2267 "one string argument.");
2268 return (-1);
2269 }
2271 str = ci->values[0].value.string;
2272 if (strcasecmp ("Encrypt", str) == 0)
2273 *retval = SECURITY_LEVEL_ENCRYPT;
2274 else if (strcasecmp ("Sign", str) == 0)
2275 *retval = SECURITY_LEVEL_SIGN;
2276 else if (strcasecmp ("None", str) == 0)
2277 *retval = SECURITY_LEVEL_NONE;
2278 else
2279 {
2280 WARNING ("network plugin: Unknown security level: %s.", str);
2281 return (-1);
2282 }
2284 return (0);
2285 } /* }}} int network_config_set_security_level */
2286 #endif /* HAVE_GCRYPT_H */
2288 static int network_config_listen_server (const oconfig_item_t *ci) /* {{{ */
2289 {
2290 char *node;
2291 char *service;
2292 char *shared_secret = NULL;
2293 int security_level = SECURITY_LEVEL_NONE;
2294 int i;
2296 if ((ci->values_num < 1) || (ci->values_num > 2)
2297 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2298 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2299 {
2300 ERROR ("network plugin: The `%s' config option needs "
2301 "one or two string arguments.", ci->key);
2302 return (-1);
2303 }
2305 node = ci->values[0].value.string;
2306 if (ci->values_num >= 2)
2307 service = ci->values[1].value.string;
2308 else
2309 service = NULL;
2311 for (i = 0; i < ci->children_num; i++)
2312 {
2313 oconfig_item_t *child = ci->children + i;
2315 #if HAVE_GCRYPT_H
2316 if (strcasecmp ("Secret", child->key) == 0)
2317 {
2318 if ((child->values_num == 1)
2319 && (child->values[0].type == OCONFIG_TYPE_STRING))
2320 shared_secret = child->values[0].value.string;
2321 else
2322 ERROR ("network plugin: The `Secret' option needs exactly one string "
2323 "argument.");
2324 }
2325 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2326 network_config_set_security_level (child, &security_level);
2327 else
2328 #endif /* HAVE_GCRYPT_H */
2329 {
2330 WARNING ("network plugin: Option `%s' is not allowed here.",
2331 child->key);
2332 }
2333 }
2335 if ((security_level > SECURITY_LEVEL_NONE) && (shared_secret == NULL))
2336 {
2337 ERROR ("network plugin: A security level higher than `none' was "
2338 "requested, but no shared key was given. Cowardly refusing to open "
2339 "this socket!");
2340 return (-1);
2341 }
2343 if (strcasecmp ("Listen", ci->key) == 0)
2344 network_add_listen_socket (node, service, shared_secret, security_level);
2345 else
2346 network_add_sending_socket (node, service, shared_secret, security_level);
2348 return (0);
2349 } /* }}} int network_config_listen_server */
2351 static int network_config_set_cache_flush (const oconfig_item_t *ci) /* {{{ */
2352 {
2353 int tmp;
2354 if ((ci->values_num != 1)
2355 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2356 {
2357 WARNING ("network plugin: The `CacheFlush' config option needs exactly "
2358 "one numeric argument.");
2359 return (-1);
2360 }
2362 tmp = (int) ci->values[0].value.number;
2363 if (tmp > 0)
2364 network_config_ttl = tmp;
2366 return (0);
2367 } /* }}} int network_config_set_cache_flush */
2369 static int network_config (oconfig_item_t *ci) /* {{{ */
2370 {
2371 int i;
2373 for (i = 0; i < ci->children_num; i++)
2374 {
2375 oconfig_item_t *child = ci->children + i;
2377 if ((strcasecmp ("Listen", child->key) == 0)
2378 || (strcasecmp ("Server", child->key) == 0))
2379 network_config_listen_server (child);
2380 else if (strcasecmp ("TimeToLive", child->key) == 0)
2381 network_config_set_ttl (child);
2382 else if (strcasecmp ("Forward", child->key) == 0)
2383 network_config_set_boolean (child, &network_config_forward);
2384 else if (strcasecmp ("CacheFlush", child->key) == 0)
2385 network_config_set_cache_flush (child);
2386 else
2387 {
2388 WARNING ("network plugin: Option `%s' is not allowed here.",
2389 child->key);
2390 }
2391 }
2393 return (0);
2394 } /* }}} int network_config */
2396 static int network_notification (const notification_t *n,
2397 user_data_t __attribute__((unused)) *user_data)
2398 {
2399 char buffer[BUFF_SIZE];
2400 char *buffer_ptr = buffer;
2401 int buffer_free = sizeof (buffer);
2402 int status;
2404 memset (buffer, '\0', sizeof (buffer));
2407 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
2408 (uint64_t) n->time);
2409 if (status != 0)
2410 return (-1);
2412 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
2413 (uint64_t) n->severity);
2414 if (status != 0)
2415 return (-1);
2417 if (strlen (n->host) > 0)
2418 {
2419 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
2420 n->host, strlen (n->host));
2421 if (status != 0)
2422 return (-1);
2423 }
2425 if (strlen (n->plugin) > 0)
2426 {
2427 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
2428 n->plugin, strlen (n->plugin));
2429 if (status != 0)
2430 return (-1);
2431 }
2433 if (strlen (n->plugin_instance) > 0)
2434 {
2435 status = write_part_string (&buffer_ptr, &buffer_free,
2436 TYPE_PLUGIN_INSTANCE,
2437 n->plugin_instance, strlen (n->plugin_instance));
2438 if (status != 0)
2439 return (-1);
2440 }
2442 if (strlen (n->type) > 0)
2443 {
2444 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
2445 n->type, strlen (n->type));
2446 if (status != 0)
2447 return (-1);
2448 }
2450 if (strlen (n->type_instance) > 0)
2451 {
2452 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
2453 n->type_instance, strlen (n->type_instance));
2454 if (status != 0)
2455 return (-1);
2456 }
2458 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
2459 n->message, strlen (n->message));
2460 if (status != 0)
2461 return (-1);
2463 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
2465 return (0);
2466 } /* int network_notification */
2468 static int network_shutdown (void)
2469 {
2470 listen_loop++;
2472 /* Kill the listening thread */
2473 if (receive_thread_running != 0)
2474 {
2475 INFO ("network plugin: Stopping receive thread.");
2476 pthread_kill (receive_thread_id, SIGTERM);
2477 pthread_join (receive_thread_id, NULL /* no return value */);
2478 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
2479 receive_thread_running = 0;
2480 }
2482 /* Shutdown the dispatching thread */
2483 if (dispatch_thread_running != 0)
2484 {
2485 INFO ("network plugin: Stopping dispatch thread.");
2486 pthread_mutex_lock (&receive_list_lock);
2487 pthread_cond_broadcast (&receive_list_cond);
2488 pthread_mutex_unlock (&receive_list_lock);
2489 pthread_join (dispatch_thread_id, /* ret = */ NULL);
2490 dispatch_thread_running = 0;
2491 }
2493 free_sockent (listen_sockets);
2495 if (send_buffer_fill > 0)
2496 flush_buffer ();
2498 if (cache_tree != NULL)
2499 {
2500 void *key;
2501 void *value;
2503 while (c_avl_pick (cache_tree, &key, &value) == 0)
2504 {
2505 sfree (key);
2506 sfree (value);
2507 }
2508 c_avl_destroy (cache_tree);
2509 cache_tree = NULL;
2510 }
2512 /* TODO: Close `sending_sockets' */
2514 plugin_unregister_config ("network");
2515 plugin_unregister_init ("network");
2516 plugin_unregister_write ("network");
2517 plugin_unregister_shutdown ("network");
2519 /* Let the init function do it's move again ;) */
2520 cache_flush_last = 0;
2522 return (0);
2523 } /* int network_shutdown */
2525 static int network_init (void)
2526 {
2527 /* Check if we were already initialized. If so, just return - there's
2528 * nothing more to do (for now, that is). */
2529 if (cache_flush_last != 0)
2530 return (0);
2532 plugin_register_shutdown ("network", network_shutdown);
2534 network_init_buffer ();
2536 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
2537 cache_flush_last = time (NULL);
2539 /* setup socket(s) and so on */
2540 if (sending_sockets != NULL)
2541 {
2542 plugin_register_write ("network", network_write,
2543 /* user_data = */ NULL);
2544 plugin_register_notification ("network", network_notification,
2545 /* user_data = */ NULL);
2546 }
2548 /* If no threads need to be started, return here. */
2549 if ((listen_sockets_num == 0)
2550 || ((dispatch_thread_running != 0)
2551 && (receive_thread_running != 0)))
2552 return (0);
2554 if (dispatch_thread_running == 0)
2555 {
2556 int status;
2557 status = pthread_create (&dispatch_thread_id,
2558 NULL /* no attributes */,
2559 dispatch_thread,
2560 NULL /* no argument */);
2561 if (status != 0)
2562 {
2563 char errbuf[1024];
2564 ERROR ("network: pthread_create failed: %s",
2565 sstrerror (errno, errbuf,
2566 sizeof (errbuf)));
2567 }
2568 else
2569 {
2570 dispatch_thread_running = 1;
2571 }
2572 }
2574 if (receive_thread_running == 0)
2575 {
2576 int status;
2577 status = pthread_create (&receive_thread_id,
2578 NULL /* no attributes */,
2579 receive_thread,
2580 NULL /* no argument */);
2581 if (status != 0)
2582 {
2583 char errbuf[1024];
2584 ERROR ("network: pthread_create failed: %s",
2585 sstrerror (errno, errbuf,
2586 sizeof (errbuf)));
2587 }
2588 else
2589 {
2590 receive_thread_running = 1;
2591 }
2592 }
2594 return (0);
2595 } /* int network_init */
2597 /*
2598 * The flush option of the network plugin cannot flush individual identifiers.
2599 * All the values are added to a buffer and sent when the buffer is full, the
2600 * requested value may or may not be in there, it's not worth finding out. We
2601 * just send the buffer if `flush' is called - if the requested value was in
2602 * there, good. If not, well, then there is nothing to flush.. -octo
2603 */
2604 static int network_flush (int timeout,
2605 const char __attribute__((unused)) *identifier,
2606 user_data_t __attribute__((unused)) *user_data)
2607 {
2608 pthread_mutex_lock (&send_buffer_lock);
2610 if (((time (NULL) - cache_flush_last) >= timeout)
2611 && (send_buffer_fill > 0))
2612 {
2613 flush_buffer ();
2614 }
2616 pthread_mutex_unlock (&send_buffer_lock);
2618 return (0);
2619 } /* int network_flush */
2621 void module_register (void)
2622 {
2623 plugin_register_complex_config ("network", network_config);
2624 plugin_register_init ("network", network_init);
2625 plugin_register_flush ("network", network_flush,
2626 /* user_data = */ NULL);
2627 } /* void module_register */
2629 /* vim: set fdm=marker : */