a00955133fb3e951cd318f9597acb3ccfca13b86
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 Lesser General Public License as published by
7 * the Free Software Foundation; only version 2.1 of the License is
8 * applicable.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 **/
23 #define _BSD_SOURCE /* For struct ip_mreq */
25 #include "collectd.h"
26 #include "plugin.h"
27 #include "common.h"
28 #include "configfile.h"
29 #include "utils_fbhash.h"
30 #include "utils_avltree.h"
32 #include "network.h"
34 #if HAVE_PTHREAD_H
35 # include <pthread.h>
36 #endif
37 #if HAVE_SYS_SOCKET_H
38 # include <sys/socket.h>
39 #endif
40 #if HAVE_NETDB_H
41 # include <netdb.h>
42 #endif
43 #if HAVE_NETINET_IN_H
44 # include <netinet/in.h>
45 #endif
46 #if HAVE_ARPA_INET_H
47 # include <arpa/inet.h>
48 #endif
49 #if HAVE_POLL_H
50 # include <poll.h>
51 #endif
53 #if HAVE_LIBGCRYPT
54 # include <gcrypt.h>
55 GCRY_THREAD_OPTION_PTHREAD_IMPL;
56 #endif
58 /* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */
59 /* #define BUFF_SIZE 1452 */
61 #ifndef IPV6_ADD_MEMBERSHIP
62 # ifdef IPV6_JOIN_GROUP
63 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
64 # else
65 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
66 # endif
67 #endif /* !IP_ADD_MEMBERSHIP */
69 /* Buffer size to allocate. */
70 #define BUFF_SIZE 1024
72 /*
73 * Maximum size required for encryption / signing:
74 *
75 * 42 bytes for the encryption header
76 * + 64 bytes for the username
77 * -----------
78 * = 106 bytes
79 */
80 #define BUFF_SIG_SIZE 106
82 /*
83 * Private data types
84 */
85 #define SECURITY_LEVEL_NONE 0
86 #if HAVE_LIBGCRYPT
87 # define SECURITY_LEVEL_SIGN 1
88 # define SECURITY_LEVEL_ENCRYPT 2
89 #endif
90 struct sockent_client
91 {
92 int fd;
93 struct sockaddr_storage *addr;
94 socklen_t addrlen;
95 #if HAVE_LIBGCRYPT
96 int security_level;
97 char *username;
98 char *password;
99 gcry_cipher_hd_t cypher;
100 unsigned char password_hash[32];
101 #endif
102 };
104 struct sockent_server
105 {
106 int *fd;
107 size_t fd_num;
108 #if HAVE_LIBGCRYPT
109 int security_level;
110 char *auth_file;
111 fbhash_t *userdb;
112 gcry_cipher_hd_t cypher;
113 #endif
114 };
116 typedef struct sockent
117 {
118 #define SOCKENT_TYPE_CLIENT 1
119 #define SOCKENT_TYPE_SERVER 2
120 int type;
122 char *node;
123 char *service;
125 union
126 {
127 struct sockent_client client;
128 struct sockent_server server;
129 } data;
131 struct sockent *next;
132 } sockent_t;
134 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
135 * 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
136 * +-------+-----------------------+-------------------------------+
137 * ! Ver. ! ! Length !
138 * +-------+-----------------------+-------------------------------+
139 */
140 struct part_header_s
141 {
142 uint16_t type;
143 uint16_t length;
144 };
145 typedef struct part_header_s part_header_t;
147 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
148 * 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
149 * +-------------------------------+-------------------------------+
150 * ! Type ! Length !
151 * +-------------------------------+-------------------------------+
152 * : (Length - 4) Bytes :
153 * +---------------------------------------------------------------+
154 */
155 struct part_string_s
156 {
157 part_header_t *head;
158 char *value;
159 };
160 typedef struct part_string_s part_string_t;
162 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
163 * 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
164 * +-------------------------------+-------------------------------+
165 * ! Type ! Length !
166 * +-------------------------------+-------------------------------+
167 * : (Length - 4 == 2 || 4 || 8) Bytes :
168 * +---------------------------------------------------------------+
169 */
170 struct part_number_s
171 {
172 part_header_t *head;
173 uint64_t *value;
174 };
175 typedef struct part_number_s part_number_t;
177 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
178 * 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
179 * +-------------------------------+-------------------------------+
180 * ! Type ! Length !
181 * +-------------------------------+---------------+---------------+
182 * ! Num of values ! Type0 ! Type1 !
183 * +-------------------------------+---------------+---------------+
184 * ! Value0 !
185 * ! !
186 * +---------------------------------------------------------------+
187 * ! Value1 !
188 * ! !
189 * +---------------------------------------------------------------+
190 */
191 struct part_values_s
192 {
193 part_header_t *head;
194 uint16_t *num_values;
195 uint8_t *values_types;
196 value_t *values;
197 };
198 typedef struct part_values_s part_values_t;
200 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
201 * 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
202 * +-------------------------------+-------------------------------+
203 * ! Type ! Length !
204 * +-------------------------------+-------------------------------+
205 * ! Hash (Bits 0 - 31) !
206 * : : :
207 * ! Hash (Bits 224 - 255) !
208 * +---------------------------------------------------------------+
209 */
210 /* Minimum size */
211 #define PART_SIGNATURE_SHA256_SIZE 36
212 struct part_signature_sha256_s
213 {
214 part_header_t head;
215 unsigned char hash[32];
216 char *username;
217 };
218 typedef struct part_signature_sha256_s part_signature_sha256_t;
220 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
221 * 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
222 * +-------------------------------+-------------------------------+
223 * ! Type ! Length !
224 * +-------------------------------+-------------------------------+
225 * ! Original length ! Padding (0 - 15 bytes) !
226 * +-------------------------------+-------------------------------+
227 * ! Hash (Bits 0 - 31) !
228 * : : :
229 * ! Hash (Bits 128 - 159) !
230 * +---------------------------------------------------------------+
231 */
232 /* Minimum size */
233 #define PART_ENCRYPTION_AES256_SIZE 42
234 struct part_encryption_aes256_s
235 {
236 part_header_t head;
237 uint16_t username_length;
238 char *username;
239 unsigned char iv[16];
240 /* <encrypted> */
241 unsigned char hash[20];
242 /* <payload /> */
243 /* </encrypted> */
244 };
245 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
247 struct receive_list_entry_s
248 {
249 char data[BUFF_SIZE];
250 int data_len;
251 int fd;
252 struct receive_list_entry_s *next;
253 };
254 typedef struct receive_list_entry_s receive_list_entry_t;
256 /*
257 * Private variables
258 */
259 static int network_config_ttl = 0;
260 static int network_config_forward = 0;
262 static sockent_t *sending_sockets = NULL;
264 static receive_list_entry_t *receive_list_head = NULL;
265 static receive_list_entry_t *receive_list_tail = NULL;
266 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
267 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
269 static sockent_t *listen_sockets = NULL;
270 static struct pollfd *listen_sockets_pollfd = NULL;
271 static size_t listen_sockets_num = 0;
273 /* The receive and dispatch threads will run as long as `listen_loop' is set to
274 * zero. */
275 static int listen_loop = 0;
276 static int receive_thread_running = 0;
277 static pthread_t receive_thread_id;
278 static int dispatch_thread_running = 0;
279 static pthread_t dispatch_thread_id;
281 /* Buffer in which to-be-sent network packets are constructed. */
282 static char send_buffer[BUFF_SIZE];
283 static char *send_buffer_ptr;
284 static int send_buffer_fill;
285 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
286 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
288 /* In this cache we store all the values we received, so we can send out only
289 * those values which were *not* received via the network plugin, too. This is
290 * used for the `Forward false' option. */
291 static c_avl_tree_t *cache_tree = NULL;
292 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
293 static time_t cache_flush_last = 0;
294 static int cache_flush_interval = 1800;
296 /*
297 * Private functions
298 */
299 static int cache_flush (void)
300 {
301 char **keys = NULL;
302 int keys_num = 0;
304 char **tmp;
305 int i;
307 char *key;
308 time_t *value;
309 c_avl_iterator_t *iter;
311 time_t curtime = time (NULL);
313 iter = c_avl_get_iterator (cache_tree);
314 while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
315 {
316 if ((curtime - *value) <= cache_flush_interval)
317 continue;
318 tmp = (char **) realloc (keys,
319 (keys_num + 1) * sizeof (char *));
320 if (tmp == NULL)
321 {
322 sfree (keys);
323 c_avl_iterator_destroy (iter);
324 ERROR ("network plugin: cache_flush: realloc"
325 " failed.");
326 return (-1);
327 }
328 keys = tmp;
329 keys[keys_num] = key;
330 keys_num++;
331 } /* while (c_avl_iterator_next) */
332 c_avl_iterator_destroy (iter);
334 for (i = 0; i < keys_num; i++)
335 {
336 if (c_avl_remove (cache_tree, keys[i], (void *) &key,
337 (void *) &value) != 0)
338 {
339 WARNING ("network plugin: cache_flush: c_avl_remove"
340 " (%s) failed.", keys[i]);
341 continue;
342 }
344 sfree (key);
345 sfree (value);
346 }
348 sfree (keys);
350 DEBUG ("network plugin: cache_flush: Removed %i %s",
351 keys_num, (keys_num == 1) ? "entry" : "entries");
352 cache_flush_last = curtime;
353 return (0);
354 } /* int cache_flush */
356 static int cache_check (const value_list_t *vl)
357 {
358 char key[1024];
359 time_t *value = NULL;
360 int retval = -1;
362 if (cache_tree == NULL)
363 return (-1);
365 if (format_name (key, sizeof (key), vl->host, vl->plugin,
366 vl->plugin_instance, vl->type, vl->type_instance))
367 return (-1);
369 pthread_mutex_lock (&cache_lock);
371 if (c_avl_get (cache_tree, key, (void *) &value) == 0)
372 {
373 if (*value < vl->time)
374 {
375 *value = vl->time;
376 retval = 0;
377 }
378 else
379 {
380 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
381 (int) *value, (int) vl->time);
382 retval = 1;
383 }
384 }
385 else
386 {
387 char *key_copy = strdup (key);
388 value = malloc (sizeof (time_t));
389 if ((key_copy != NULL) && (value != NULL))
390 {
391 *value = vl->time;
392 c_avl_insert (cache_tree, key_copy, value);
393 retval = 0;
394 }
395 else
396 {
397 sfree (key_copy);
398 sfree (value);
399 }
400 }
402 if ((time (NULL) - cache_flush_last) > cache_flush_interval)
403 cache_flush ();
405 pthread_mutex_unlock (&cache_lock);
407 return (retval);
408 } /* int cache_check */
410 #if HAVE_LIBGCRYPT
411 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
412 const void *iv, size_t iv_size, const char *username)
413 {
414 gcry_error_t err;
415 gcry_cipher_hd_t *cyper_ptr;
416 unsigned char password_hash[32];
418 if (se->type == SOCKENT_TYPE_CLIENT)
419 {
420 cyper_ptr = &se->data.client.cypher;
421 memcpy (password_hash, se->data.client.password_hash,
422 sizeof (password_hash));
423 }
424 else
425 {
426 char *secret;
428 cyper_ptr = &se->data.server.cypher;
430 if (username == NULL)
431 return (NULL);
433 secret = fbh_get (se->data.server.userdb, username);
434 if (secret == NULL)
435 return (NULL);
437 gcry_md_hash_buffer (GCRY_MD_SHA256,
438 password_hash,
439 secret, strlen (secret));
441 sfree (secret);
442 }
444 if (*cyper_ptr == NULL)
445 {
446 err = gcry_cipher_open (cyper_ptr,
447 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0);
448 if (err != 0)
449 {
450 ERROR ("network plugin: gcry_cipher_open returned: %s",
451 gcry_strerror (err));
452 *cyper_ptr = NULL;
453 return (NULL);
454 }
455 }
456 else
457 {
458 gcry_cipher_reset (*cyper_ptr);
459 }
460 assert (*cyper_ptr != NULL);
462 err = gcry_cipher_setkey (*cyper_ptr,
463 password_hash, sizeof (password_hash));
464 if (err != 0)
465 {
466 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
467 gcry_strerror (err));
468 gcry_cipher_close (*cyper_ptr);
469 *cyper_ptr = NULL;
470 return (NULL);
471 }
473 err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size);
474 if (err != 0)
475 {
476 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
477 gcry_strerror (err));
478 gcry_cipher_close (*cyper_ptr);
479 *cyper_ptr = NULL;
480 return (NULL);
481 }
483 return (*cyper_ptr);
484 } /* }}} int network_get_aes256_cypher */
485 #endif /* HAVE_LIBGCRYPT */
487 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
488 const data_set_t *ds, const value_list_t *vl)
489 {
490 char *packet_ptr;
491 int packet_len;
492 int num_values;
494 part_header_t pkg_ph;
495 uint16_t pkg_num_values;
496 uint8_t *pkg_values_types;
497 value_t *pkg_values;
499 int offset;
500 int i;
502 num_values = vl->values_len;
503 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
504 + (num_values * sizeof (uint8_t))
505 + (num_values * sizeof (value_t));
507 if (*ret_buffer_len < packet_len)
508 return (-1);
510 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
511 if (pkg_values_types == NULL)
512 {
513 ERROR ("network plugin: write_part_values: malloc failed.");
514 return (-1);
515 }
517 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
518 if (pkg_values == NULL)
519 {
520 free (pkg_values_types);
521 ERROR ("network plugin: write_part_values: malloc failed.");
522 return (-1);
523 }
525 pkg_ph.type = htons (TYPE_VALUES);
526 pkg_ph.length = htons (packet_len);
528 pkg_num_values = htons ((uint16_t) vl->values_len);
530 for (i = 0; i < num_values; i++)
531 {
532 if (ds->ds[i].type == DS_TYPE_COUNTER)
533 {
534 pkg_values_types[i] = DS_TYPE_COUNTER;
535 pkg_values[i].counter = htonll (vl->values[i].counter);
536 }
537 else
538 {
539 pkg_values_types[i] = DS_TYPE_GAUGE;
540 pkg_values[i].gauge = htond (vl->values[i].gauge);
541 }
542 }
544 /*
545 * Use `memcpy' to write everything to the buffer, because the pointer
546 * may be unaligned and some architectures, such as SPARC, can't handle
547 * that.
548 */
549 packet_ptr = *ret_buffer;
550 offset = 0;
551 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
552 offset += sizeof (pkg_ph);
553 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
554 offset += sizeof (pkg_num_values);
555 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
556 offset += num_values * sizeof (uint8_t);
557 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
558 offset += num_values * sizeof (value_t);
560 assert (offset == packet_len);
562 *ret_buffer = packet_ptr + packet_len;
563 *ret_buffer_len -= packet_len;
565 free (pkg_values_types);
566 free (pkg_values);
568 return (0);
569 } /* int write_part_values */
571 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
572 int type, uint64_t value)
573 {
574 char *packet_ptr;
575 int packet_len;
577 part_header_t pkg_head;
578 uint64_t pkg_value;
580 int offset;
582 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
584 if (*ret_buffer_len < packet_len)
585 return (-1);
587 pkg_head.type = htons (type);
588 pkg_head.length = htons (packet_len);
589 pkg_value = htonll (value);
591 packet_ptr = *ret_buffer;
592 offset = 0;
593 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
594 offset += sizeof (pkg_head);
595 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
596 offset += sizeof (pkg_value);
598 assert (offset == packet_len);
600 *ret_buffer = packet_ptr + packet_len;
601 *ret_buffer_len -= packet_len;
603 return (0);
604 } /* int write_part_number */
606 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
607 int type, const char *str, int str_len)
608 {
609 char *buffer;
610 int buffer_len;
612 uint16_t pkg_type;
613 uint16_t pkg_length;
615 int offset;
617 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
618 if (*ret_buffer_len < buffer_len)
619 return (-1);
621 pkg_type = htons (type);
622 pkg_length = htons (buffer_len);
624 buffer = *ret_buffer;
625 offset = 0;
626 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
627 offset += sizeof (pkg_type);
628 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
629 offset += sizeof (pkg_length);
630 memcpy (buffer + offset, str, str_len);
631 offset += str_len;
632 memset (buffer + offset, '\0', 1);
633 offset += 1;
635 assert (offset == buffer_len);
637 *ret_buffer = buffer + buffer_len;
638 *ret_buffer_len -= buffer_len;
640 return (0);
641 } /* int write_part_string */
643 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
644 value_t **ret_values, int *ret_num_values)
645 {
646 char *buffer = *ret_buffer;
647 size_t buffer_len = *ret_buffer_len;
649 uint16_t tmp16;
650 size_t exp_size;
651 int i;
653 uint16_t pkg_length;
654 uint16_t pkg_type;
655 uint16_t pkg_numval;
657 uint8_t *pkg_types;
658 value_t *pkg_values;
660 if (buffer_len < 15)
661 {
662 NOTICE ("network plugin: packet is too short: "
663 "buffer_len = %zu", buffer_len);
664 return (-1);
665 }
667 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
668 buffer += sizeof (tmp16);
669 pkg_type = ntohs (tmp16);
671 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
672 buffer += sizeof (tmp16);
673 pkg_length = ntohs (tmp16);
675 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
676 buffer += sizeof (tmp16);
677 pkg_numval = ntohs (tmp16);
679 assert (pkg_type == TYPE_VALUES);
681 exp_size = 3 * sizeof (uint16_t)
682 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
683 if ((buffer_len < 0) || (buffer_len < exp_size))
684 {
685 WARNING ("network plugin: parse_part_values: "
686 "Packet too short: "
687 "Chunk of size %zu expected, "
688 "but buffer has only %zu bytes left.",
689 exp_size, buffer_len);
690 return (-1);
691 }
693 if (pkg_length != exp_size)
694 {
695 WARNING ("network plugin: parse_part_values: "
696 "Length and number of values "
697 "in the packet don't match.");
698 return (-1);
699 }
701 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
702 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
703 if ((pkg_types == NULL) || (pkg_values == NULL))
704 {
705 sfree (pkg_types);
706 sfree (pkg_values);
707 ERROR ("network plugin: parse_part_values: malloc failed.");
708 return (-1);
709 }
711 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
712 buffer += pkg_numval * sizeof (uint8_t);
713 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
714 buffer += pkg_numval * sizeof (value_t);
716 for (i = 0; i < pkg_numval; i++)
717 {
718 if (pkg_types[i] == DS_TYPE_COUNTER)
719 pkg_values[i].counter = ntohll (pkg_values[i].counter);
720 else if (pkg_types[i] == DS_TYPE_GAUGE)
721 pkg_values[i].gauge = ntohd (pkg_values[i].gauge);
722 }
724 *ret_buffer = buffer;
725 *ret_buffer_len = buffer_len - pkg_length;
726 *ret_num_values = pkg_numval;
727 *ret_values = pkg_values;
729 sfree (pkg_types);
731 return (0);
732 } /* int parse_part_values */
734 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
735 uint64_t *value)
736 {
737 char *buffer = *ret_buffer;
738 size_t buffer_len = *ret_buffer_len;
740 uint16_t tmp16;
741 uint64_t tmp64;
742 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
744 uint16_t pkg_length;
745 uint16_t pkg_type;
747 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
748 {
749 WARNING ("network plugin: parse_part_number: "
750 "Packet too short: "
751 "Chunk of size %zu expected, "
752 "but buffer has only %zu bytes left.",
753 exp_size, buffer_len);
754 return (-1);
755 }
757 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
758 buffer += sizeof (tmp16);
759 pkg_type = ntohs (tmp16);
761 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
762 buffer += sizeof (tmp16);
763 pkg_length = ntohs (tmp16);
765 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
766 buffer += sizeof (tmp64);
767 *value = ntohll (tmp64);
769 *ret_buffer = buffer;
770 *ret_buffer_len = buffer_len - pkg_length;
772 return (0);
773 } /* int parse_part_number */
775 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
776 char *output, int output_len)
777 {
778 char *buffer = *ret_buffer;
779 size_t buffer_len = *ret_buffer_len;
781 uint16_t tmp16;
782 size_t header_size = 2 * sizeof (uint16_t);
784 uint16_t pkg_length;
785 uint16_t pkg_type;
787 if ((buffer_len < 0) || (buffer_len < header_size))
788 {
789 WARNING ("network plugin: parse_part_string: "
790 "Packet too short: "
791 "Chunk of at least size %zu expected, "
792 "but buffer has only %zu bytes left.",
793 header_size, buffer_len);
794 return (-1);
795 }
797 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
798 buffer += sizeof (tmp16);
799 pkg_type = ntohs (tmp16);
801 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
802 buffer += sizeof (tmp16);
803 pkg_length = ntohs (tmp16);
805 /* Check that packet fits in the input buffer */
806 if (pkg_length > buffer_len)
807 {
808 WARNING ("network plugin: parse_part_string: "
809 "Packet too big: "
810 "Chunk of size %"PRIu16" received, "
811 "but buffer has only %zu bytes left.",
812 pkg_length, buffer_len);
813 return (-1);
814 }
816 /* Check that pkg_length is in the valid range */
817 if (pkg_length <= header_size)
818 {
819 WARNING ("network plugin: parse_part_string: "
820 "Packet too short: "
821 "Header claims this packet is only %hu "
822 "bytes long.", pkg_length);
823 return (-1);
824 }
826 /* Check that the package data fits into the output buffer.
827 * The previous if-statement ensures that:
828 * `pkg_length > header_size' */
829 if ((output_len < 0)
830 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
831 {
832 WARNING ("network plugin: parse_part_string: "
833 "Output buffer too small.");
834 return (-1);
835 }
837 /* All sanity checks successfull, let's copy the data over */
838 output_len = pkg_length - header_size;
839 memcpy ((void *) output, (void *) buffer, output_len);
840 buffer += output_len;
842 /* For some very weird reason '\0' doesn't do the trick on SPARC in
843 * this statement. */
844 if (output[output_len - 1] != 0)
845 {
846 WARNING ("network plugin: parse_part_string: "
847 "Received string does not end "
848 "with a NULL-byte.");
849 return (-1);
850 }
852 *ret_buffer = buffer;
853 *ret_buffer_len = buffer_len - pkg_length;
855 return (0);
856 } /* int parse_part_string */
858 /* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call
859 * parse_packet and vice versa. */
860 #define PP_SIGNED 0x01
861 #define PP_ENCRYPTED 0x02
862 static int parse_packet (sockent_t *se,
863 void *buffer, size_t buffer_size, int flags);
865 #define BUFFER_READ(p,s) do { \
866 memcpy ((p), buffer + buffer_offset, (s)); \
867 buffer_offset += (s); \
868 } while (0)
870 #if HAVE_LIBGCRYPT
871 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
872 void **ret_buffer, size_t *ret_buffer_len, int flags)
873 {
874 char *buffer;
875 size_t buffer_len;
876 size_t buffer_offset;
878 size_t username_len;
879 char *secret;
881 part_signature_sha256_t pss;
882 uint16_t pss_head_length;
883 char hash[sizeof (pss.hash)];
885 gcry_md_hd_t hd;
886 gcry_error_t err;
887 unsigned char *hash_ptr;
889 buffer = *ret_buffer;
890 buffer_len = *ret_buffer_len;
891 buffer_offset = 0;
893 if (se->data.server.userdb == NULL)
894 {
895 NOTICE ("network plugin: Received signed network packet but can't verify "
896 "it because no user DB has been configured. Will accept it.");
897 return (0);
898 }
900 /* Check if the buffer has enough data for this structure. */
901 if (buffer_len <= PART_SIGNATURE_SHA256_SIZE)
902 return (-ENOMEM);
904 /* Read type and length header */
905 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
906 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
907 pss_head_length = ntohs (pss.head.length);
909 /* Check if the `pss_head_length' is within bounds. */
910 if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE)
911 || (pss_head_length > buffer_len))
912 {
913 ERROR ("network plugin: HMAC-SHA-256 with invalid length received.");
914 return (-1);
915 }
917 /* Copy the hash. */
918 BUFFER_READ (pss.hash, sizeof (pss.hash));
920 /* Calculate username length (without null byte) and allocate memory */
921 username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE;
922 pss.username = malloc (username_len + 1);
923 if (pss.username == NULL)
924 return (-ENOMEM);
926 /* Read the username */
927 BUFFER_READ (pss.username, username_len);
928 pss.username[username_len] = 0;
930 assert (buffer_offset == pss_head_length);
932 /* Query the password */
933 secret = fbh_get (se->data.server.userdb, pss.username);
934 if (secret == NULL)
935 {
936 ERROR ("network plugin: Unknown user: %s", pss.username);
937 sfree (pss.username);
938 return (-ENOENT);
939 }
941 /* Create a hash device and check the HMAC */
942 hd = NULL;
943 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
944 if (err != 0)
945 {
946 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
947 gcry_strerror (err));
948 sfree (secret);
949 sfree (pss.username);
950 return (-1);
951 }
953 err = gcry_md_setkey (hd, secret, strlen (secret));
954 if (err != 0)
955 {
956 ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err));
957 gcry_md_close (hd);
958 return (-1);
959 }
961 gcry_md_write (hd,
962 buffer + PART_SIGNATURE_SHA256_SIZE,
963 buffer_len - PART_SIGNATURE_SHA256_SIZE);
964 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
965 if (hash_ptr == NULL)
966 {
967 ERROR ("network plugin: gcry_md_read failed.");
968 gcry_md_close (hd);
969 sfree (secret);
970 sfree (pss.username);
971 return (-1);
972 }
973 memcpy (hash, hash_ptr, sizeof (hash));
975 /* Clean up */
976 gcry_md_close (hd);
977 hd = NULL;
979 sfree (secret);
980 sfree (pss.username);
982 if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0)
983 {
984 WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: "
985 "Hash mismatch.");
986 }
987 else
988 {
989 parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset,
990 flags | PP_SIGNED);
991 }
993 *ret_buffer = buffer + buffer_len;
994 *ret_buffer_len = 0;
996 return (0);
997 } /* }}} int parse_part_sign_sha256 */
998 /* #endif HAVE_LIBGCRYPT */
1000 #else /* if !HAVE_LIBGCRYPT */
1001 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1002 void **ret_buffer, size_t *ret_buffer_size, int flags)
1003 {
1004 static int warning_has_been_printed = 0;
1006 char *buffer;
1007 size_t buffer_size;
1008 size_t buffer_offset;
1009 uint16_t part_len;
1011 part_signature_sha256_t pss;
1013 buffer = *ret_buffer;
1014 buffer_size = *ret_buffer_size;
1015 buffer_offset = 0;
1017 if (buffer_size <= PART_SIGNATURE_SHA256_SIZE)
1018 return (-ENOMEM);
1020 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1021 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1022 part_len = ntohs (pss.head.length);
1024 if ((part_len <= PART_SIGNATURE_SHA256_SIZE)
1025 || (part_len > buffer_size))
1026 return (-EINVAL);
1028 if (warning_has_been_printed == 0)
1029 {
1030 WARNING ("network plugin: Received signed packet, but the network "
1031 "plugin was not linked with libgcrypt, so I cannot "
1032 "verify the signature. The packet will be accepted.");
1033 warning_has_been_printed = 1;
1034 }
1036 parse_packet (se, buffer + part_len, buffer_size - part_len, flags);
1038 *ret_buffer = buffer + buffer_size;
1039 *ret_buffer_size = 0;
1041 return (0);
1042 } /* }}} int parse_part_sign_sha256 */
1043 #endif /* !HAVE_LIBGCRYPT */
1045 #if HAVE_LIBGCRYPT
1046 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1047 void **ret_buffer, size_t *ret_buffer_len,
1048 int flags)
1049 {
1050 char *buffer = *ret_buffer;
1051 size_t buffer_len = *ret_buffer_len;
1052 size_t payload_len;
1053 size_t part_size;
1054 size_t buffer_offset;
1055 uint16_t username_len;
1056 part_encryption_aes256_t pea;
1057 unsigned char hash[sizeof (pea.hash)];
1059 gcry_cipher_hd_t cypher;
1060 gcry_error_t err;
1062 /* Make sure at least the header if available. */
1063 if (buffer_len <= PART_ENCRYPTION_AES256_SIZE)
1064 {
1065 NOTICE ("network plugin: parse_part_encr_aes256: "
1066 "Discarding short packet.");
1067 return (-1);
1068 }
1070 buffer_offset = 0;
1072 /* Copy the unencrypted information into `pea'. */
1073 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
1074 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
1076 /* Check the `part size'. */
1077 part_size = ntohs (pea.head.length);
1078 if ((part_size <= PART_ENCRYPTION_AES256_SIZE)
1079 || (part_size > buffer_len))
1080 {
1081 NOTICE ("network plugin: parse_part_encr_aes256: "
1082 "Discarding part with invalid size.");
1083 return (-1);
1084 }
1086 /* Read the username */
1087 BUFFER_READ (&username_len, sizeof (username_len));
1088 username_len = ntohs (username_len);
1090 if ((username_len <= 0)
1091 || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1))))
1092 {
1093 NOTICE ("network plugin: parse_part_encr_aes256: "
1094 "Discarding part with invalid username length.");
1095 return (-1);
1096 }
1098 assert (username_len > 0);
1099 pea.username = malloc (username_len + 1);
1100 if (pea.username == NULL)
1101 return (-ENOMEM);
1102 BUFFER_READ (pea.username, username_len);
1103 pea.username[username_len] = 0;
1105 /* Last but not least, the initialization vector */
1106 BUFFER_READ (pea.iv, sizeof (pea.iv));
1108 /* Make sure we are at the right position */
1109 assert (buffer_offset == (username_len +
1110 PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash)));
1112 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
1113 pea.username);
1114 if (cypher == NULL)
1115 return (-1);
1117 payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len);
1118 assert (payload_len > 0);
1120 /* Decrypt the packet in-place */
1121 err = gcry_cipher_decrypt (cypher,
1122 buffer + buffer_offset,
1123 part_size - buffer_offset,
1124 /* in = */ NULL, /* in len = */ 0);
1125 if (err != 0)
1126 {
1127 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
1128 gcry_strerror (err));
1129 return (-1);
1130 }
1132 /* Read the hash */
1133 BUFFER_READ (pea.hash, sizeof (pea.hash));
1135 /* Make sure we're at the right position - again */
1136 assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE));
1137 assert (buffer_offset == (part_size - payload_len));
1139 /* Check hash sum */
1140 memset (hash, 0, sizeof (hash));
1141 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
1142 buffer + buffer_offset, payload_len);
1143 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
1144 {
1145 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
1146 return (-1);
1147 }
1149 parse_packet (se, buffer + buffer_offset, payload_len,
1150 flags | PP_ENCRYPTED);
1152 /* Update return values */
1153 *ret_buffer = buffer + part_size;
1154 *ret_buffer_len = buffer_len - part_size;
1156 return (0);
1157 } /* }}} int parse_part_encr_aes256 */
1158 /* #endif HAVE_LIBGCRYPT */
1160 #else /* if !HAVE_LIBGCRYPT */
1161 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1162 void **ret_buffer, size_t *ret_buffer_size, int flags)
1163 {
1164 static int warning_has_been_printed = 0;
1166 char *buffer;
1167 size_t buffer_size;
1168 size_t buffer_offset;
1170 part_header_t ph;
1171 size_t ph_length;
1173 buffer = *ret_buffer;
1174 buffer_size = *ret_buffer_size;
1175 buffer_offset = 0;
1177 /* parse_packet assures this minimum size. */
1178 assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length)));
1180 BUFFER_READ (&ph.type, sizeof (ph.type));
1181 BUFFER_READ (&ph.length, sizeof (ph.length));
1182 ph_length = ntohs (ph.length);
1184 if ((ph_length <= PART_ENCRYPTION_AES256_SIZE)
1185 || (ph_length > buffer_size))
1186 {
1187 ERROR ("network plugin: AES-256 encrypted part "
1188 "with invalid length received.");
1189 return (-1);
1190 }
1192 if (warning_has_been_printed == 0)
1193 {
1194 WARNING ("network plugin: Received encrypted packet, but the network "
1195 "plugin was not linked with libgcrypt, so I cannot "
1196 "decrypt it. The part will be discarded.");
1197 warning_has_been_printed = 1;
1198 }
1200 *ret_buffer += ph_length;
1201 *ret_buffer_size -= ph_length;
1203 return (0);
1204 } /* }}} int parse_part_encr_aes256 */
1205 #endif /* !HAVE_LIBGCRYPT */
1207 #undef BUFFER_READ
1209 static int parse_packet (sockent_t *se, /* {{{ */
1210 void *buffer, size_t buffer_size, int flags)
1211 {
1212 int status;
1214 value_list_t vl = VALUE_LIST_INIT;
1215 notification_t n;
1217 #if HAVE_LIBGCRYPT
1218 int packet_was_signed = (flags & PP_SIGNED);
1219 int packet_was_encrypted = (flags & PP_ENCRYPTED);
1220 int printed_ignore_warning = 0;
1221 #endif /* HAVE_LIBGCRYPT */
1224 memset (&vl, '\0', sizeof (vl));
1225 memset (&n, '\0', sizeof (n));
1226 status = 0;
1228 while ((status == 0) && (0 < buffer_size)
1229 && ((unsigned int) buffer_size > sizeof (part_header_t)))
1230 {
1231 uint16_t pkg_length;
1232 uint16_t pkg_type;
1234 memcpy ((void *) &pkg_type,
1235 (void *) buffer,
1236 sizeof (pkg_type));
1237 memcpy ((void *) &pkg_length,
1238 (void *) (buffer + sizeof (pkg_type)),
1239 sizeof (pkg_length));
1241 pkg_length = ntohs (pkg_length);
1242 pkg_type = ntohs (pkg_type);
1244 if (pkg_length > buffer_size)
1245 break;
1246 /* Ensure that this loop terminates eventually */
1247 if (pkg_length < (2 * sizeof (uint16_t)))
1248 break;
1250 if (pkg_type == TYPE_ENCR_AES256)
1251 {
1252 status = parse_part_encr_aes256 (se,
1253 &buffer, &buffer_size, flags);
1254 if (status != 0)
1255 {
1256 ERROR ("network plugin: Decrypting AES256 "
1257 "part failed "
1258 "with status %i.", status);
1259 break;
1260 }
1261 }
1262 #if HAVE_LIBGCRYPT
1263 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
1264 && (packet_was_encrypted == 0))
1265 {
1266 if (printed_ignore_warning == 0)
1267 {
1268 INFO ("network plugin: Unencrypted packet or "
1269 "part has been ignored.");
1270 printed_ignore_warning = 1;
1271 }
1272 buffer = ((char *) buffer) + pkg_length;
1273 continue;
1274 }
1275 #endif /* HAVE_LIBGCRYPT */
1276 else if (pkg_type == TYPE_SIGN_SHA256)
1277 {
1278 status = parse_part_sign_sha256 (se,
1279 &buffer, &buffer_size, flags);
1280 if (status != 0)
1281 {
1282 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1283 "signature failed "
1284 "with status %i.", status);
1285 break;
1286 }
1287 }
1288 #if HAVE_LIBGCRYPT
1289 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
1290 && (packet_was_encrypted == 0)
1291 && (packet_was_signed == 0))
1292 {
1293 if (printed_ignore_warning == 0)
1294 {
1295 INFO ("network plugin: Unsigned packet or "
1296 "part has been ignored.");
1297 printed_ignore_warning = 1;
1298 }
1299 buffer = ((char *) buffer) + pkg_length;
1300 continue;
1301 }
1302 #endif /* HAVE_LIBGCRYPT */
1303 else if (pkg_type == TYPE_VALUES)
1304 {
1305 status = parse_part_values (&buffer, &buffer_size,
1306 &vl.values, &vl.values_len);
1308 if (status != 0)
1309 break;
1311 if ((vl.time > 0)
1312 && (strlen (vl.host) > 0)
1313 && (strlen (vl.plugin) > 0)
1314 && (strlen (vl.type) > 0)
1315 && (cache_check (&vl) == 0))
1316 {
1317 plugin_dispatch_values (&vl);
1318 }
1319 else
1320 {
1321 DEBUG ("network plugin: parse_packet:"
1322 " NOT dispatching values");
1323 }
1325 sfree (vl.values);
1326 }
1327 else if (pkg_type == TYPE_TIME)
1328 {
1329 uint64_t tmp = 0;
1330 status = parse_part_number (&buffer, &buffer_size,
1331 &tmp);
1332 if (status == 0)
1333 {
1334 vl.time = (time_t) tmp;
1335 n.time = (time_t) tmp;
1336 }
1337 }
1338 else if (pkg_type == TYPE_INTERVAL)
1339 {
1340 uint64_t tmp = 0;
1341 status = parse_part_number (&buffer, &buffer_size,
1342 &tmp);
1343 if (status == 0)
1344 vl.interval = (int) tmp;
1345 }
1346 else if (pkg_type == TYPE_HOST)
1347 {
1348 status = parse_part_string (&buffer, &buffer_size,
1349 vl.host, sizeof (vl.host));
1350 if (status == 0)
1351 sstrncpy (n.host, vl.host, sizeof (n.host));
1352 }
1353 else if (pkg_type == TYPE_PLUGIN)
1354 {
1355 status = parse_part_string (&buffer, &buffer_size,
1356 vl.plugin, sizeof (vl.plugin));
1357 if (status == 0)
1358 sstrncpy (n.plugin, vl.plugin,
1359 sizeof (n.plugin));
1360 }
1361 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1362 {
1363 status = parse_part_string (&buffer, &buffer_size,
1364 vl.plugin_instance,
1365 sizeof (vl.plugin_instance));
1366 if (status == 0)
1367 sstrncpy (n.plugin_instance,
1368 vl.plugin_instance,
1369 sizeof (n.plugin_instance));
1370 }
1371 else if (pkg_type == TYPE_TYPE)
1372 {
1373 status = parse_part_string (&buffer, &buffer_size,
1374 vl.type, sizeof (vl.type));
1375 if (status == 0)
1376 sstrncpy (n.type, vl.type, sizeof (n.type));
1377 }
1378 else if (pkg_type == TYPE_TYPE_INSTANCE)
1379 {
1380 status = parse_part_string (&buffer, &buffer_size,
1381 vl.type_instance,
1382 sizeof (vl.type_instance));
1383 if (status == 0)
1384 sstrncpy (n.type_instance, vl.type_instance,
1385 sizeof (n.type_instance));
1386 }
1387 else if (pkg_type == TYPE_MESSAGE)
1388 {
1389 status = parse_part_string (&buffer, &buffer_size,
1390 n.message, sizeof (n.message));
1392 if (status != 0)
1393 {
1394 /* do nothing */
1395 }
1396 else if ((n.severity != NOTIF_FAILURE)
1397 && (n.severity != NOTIF_WARNING)
1398 && (n.severity != NOTIF_OKAY))
1399 {
1400 INFO ("network plugin: "
1401 "Ignoring notification with "
1402 "unknown severity %i.",
1403 n.severity);
1404 }
1405 else if (n.time <= 0)
1406 {
1407 INFO ("network plugin: "
1408 "Ignoring notification with "
1409 "time == 0.");
1410 }
1411 else if (strlen (n.message) <= 0)
1412 {
1413 INFO ("network plugin: "
1414 "Ignoring notification with "
1415 "an empty message.");
1416 }
1417 else
1418 {
1419 plugin_dispatch_notification (&n);
1420 }
1421 }
1422 else if (pkg_type == TYPE_SEVERITY)
1423 {
1424 uint64_t tmp = 0;
1425 status = parse_part_number (&buffer, &buffer_size,
1426 &tmp);
1427 if (status == 0)
1428 n.severity = (int) tmp;
1429 }
1430 else
1431 {
1432 DEBUG ("network plugin: parse_packet: Unknown part"
1433 " type: 0x%04hx", pkg_type);
1434 buffer = ((char *) buffer) + pkg_length;
1435 }
1436 } /* while (buffer_size > sizeof (part_header_t)) */
1438 return (status);
1439 } /* }}} int parse_packet */
1441 static void free_sockent_client (struct sockent_client *sec) /* {{{ */
1442 {
1443 if (sec->fd >= 0)
1444 {
1445 close (sec->fd);
1446 sec->fd = -1;
1447 }
1448 sfree (sec->addr);
1449 #if HAVE_LIBGCRYPT
1450 sfree (sec->username);
1451 sfree (sec->password);
1452 if (sec->cypher != NULL)
1453 gcry_cipher_close (sec->cypher);
1454 #endif
1455 } /* }}} void free_sockent_client */
1457 static void free_sockent_server (struct sockent_server *ses) /* {{{ */
1458 {
1459 size_t i;
1461 for (i = 0; i < ses->fd_num; i++)
1462 {
1463 if (ses->fd[i] >= 0)
1464 {
1465 close (ses->fd[i]);
1466 ses->fd[i] = -1;
1467 }
1468 }
1470 sfree (ses->fd);
1471 #if HAVE_LIBGCRYPT
1472 sfree (ses->auth_file);
1473 fbh_destroy (ses->userdb);
1474 if (ses->cypher != NULL)
1475 gcry_cipher_close (ses->cypher);
1476 #endif
1477 } /* }}} void free_sockent_server */
1479 static void sockent_destroy (sockent_t *se) /* {{{ */
1480 {
1481 sockent_t *next;
1483 DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se);
1485 while (se != NULL)
1486 {
1487 next = se->next;
1489 sfree (se->node);
1490 sfree (se->service);
1492 if (se->type == SOCKENT_TYPE_CLIENT)
1493 free_sockent_client (&se->data.client);
1494 else
1495 free_sockent_server (&se->data.server);
1497 sfree (se);
1498 se = next;
1499 }
1500 } /* }}} void sockent_destroy */
1502 /*
1503 * int network_set_ttl
1504 *
1505 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1506 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1507 *
1508 * The `struct addrinfo' is used to destinguish between unicast and multicast
1509 * sockets.
1510 */
1511 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1512 {
1513 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1514 network_config_ttl);
1516 assert (se->type == SOCKENT_TYPE_CLIENT);
1518 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1519 return (-1);
1521 if (ai->ai_family == AF_INET)
1522 {
1523 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1524 int optname;
1526 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1527 optname = IP_MULTICAST_TTL;
1528 else
1529 optname = IP_TTL;
1531 if (setsockopt (se->data.client.fd, IPPROTO_IP, optname,
1532 &network_config_ttl,
1533 sizeof (network_config_ttl)) == -1)
1534 {
1535 char errbuf[1024];
1536 ERROR ("setsockopt: %s",
1537 sstrerror (errno, errbuf, sizeof (errbuf)));
1538 return (-1);
1539 }
1540 }
1541 else if (ai->ai_family == AF_INET6)
1542 {
1543 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1544 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1545 int optname;
1547 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1548 optname = IPV6_MULTICAST_HOPS;
1549 else
1550 optname = IPV6_UNICAST_HOPS;
1552 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname,
1553 &network_config_ttl,
1554 sizeof (network_config_ttl)) == -1)
1555 {
1556 char errbuf[1024];
1557 ERROR ("setsockopt: %s",
1558 sstrerror (errno, errbuf,
1559 sizeof (errbuf)));
1560 return (-1);
1561 }
1562 }
1564 return (0);
1565 } /* int network_set_ttl */
1567 static int network_bind_socket (int fd, const struct addrinfo *ai)
1568 {
1569 int loop = 0;
1570 int yes = 1;
1572 /* allow multiple sockets to use the same PORT number */
1573 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
1574 &yes, sizeof(yes)) == -1) {
1575 char errbuf[1024];
1576 ERROR ("setsockopt: %s",
1577 sstrerror (errno, errbuf, sizeof (errbuf)));
1578 return (-1);
1579 }
1581 DEBUG ("fd = %i; calling `bind'", fd);
1583 if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1)
1584 {
1585 char errbuf[1024];
1586 ERROR ("bind: %s",
1587 sstrerror (errno, errbuf, sizeof (errbuf)));
1588 return (-1);
1589 }
1591 if (ai->ai_family == AF_INET)
1592 {
1593 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1594 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1595 {
1596 struct ip_mreq mreq;
1598 DEBUG ("fd = %i; IPv4 multicast address found", fd);
1600 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1601 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
1603 if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1604 &loop, sizeof (loop)) == -1)
1605 {
1606 char errbuf[1024];
1607 ERROR ("setsockopt: %s",
1608 sstrerror (errno, errbuf,
1609 sizeof (errbuf)));
1610 return (-1);
1611 }
1613 if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1614 &mreq, sizeof (mreq)) == -1)
1615 {
1616 char errbuf[1024];
1617 ERROR ("setsockopt: %s",
1618 sstrerror (errno, errbuf,
1619 sizeof (errbuf)));
1620 return (-1);
1621 }
1622 }
1623 }
1624 else if (ai->ai_family == AF_INET6)
1625 {
1626 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1627 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1628 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1629 {
1630 struct ipv6_mreq mreq;
1632 DEBUG ("fd = %i; IPv6 multicast address found", fd);
1634 memcpy (&mreq.ipv6mr_multiaddr,
1635 &addr->sin6_addr,
1636 sizeof (addr->sin6_addr));
1638 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1639 * ipv6mr_interface may be set to zeroes to
1640 * choose the default multicast interface or to
1641 * the index of a particular multicast-capable
1642 * interface if the host is multihomed.
1643 * Membership is associ-associated with a
1644 * single interface; programs running on
1645 * multihomed hosts may need to join the same
1646 * group on more than one interface.*/
1647 mreq.ipv6mr_interface = 0;
1649 if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1650 &loop, sizeof (loop)) == -1)
1651 {
1652 char errbuf[1024];
1653 ERROR ("setsockopt: %s",
1654 sstrerror (errno, errbuf,
1655 sizeof (errbuf)));
1656 return (-1);
1657 }
1659 if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1660 &mreq, sizeof (mreq)) == -1)
1661 {
1662 char errbuf[1024];
1663 ERROR ("setsockopt: %s",
1664 sstrerror (errno, errbuf,
1665 sizeof (errbuf)));
1666 return (-1);
1667 }
1668 }
1669 }
1671 return (0);
1672 } /* int network_bind_socket */
1674 /* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT'
1675 * or `SOCKENT_TYPE_SERVER' */
1676 static int sockent_init (sockent_t *se, int type) /* {{{ */
1677 {
1678 if (se == NULL)
1679 return (-1);
1681 memset (se, 0, sizeof (*se));
1683 se->type = SOCKENT_TYPE_CLIENT;
1684 se->node = NULL;
1685 se->service = NULL;
1686 se->next = NULL;
1688 if (type == SOCKENT_TYPE_SERVER)
1689 {
1690 se->type = SOCKENT_TYPE_SERVER;
1691 se->data.server.fd = NULL;
1692 #if HAVE_LIBGCRYPT
1693 se->data.server.security_level = SECURITY_LEVEL_NONE;
1694 se->data.server.auth_file = NULL;
1695 se->data.server.userdb = NULL;
1696 se->data.server.cypher = NULL;
1697 #endif
1698 }
1699 else
1700 {
1701 se->data.client.fd = -1;
1702 se->data.client.addr = NULL;
1703 #if HAVE_LIBGCRYPT
1704 se->data.client.security_level = SECURITY_LEVEL_NONE;
1705 se->data.client.username = NULL;
1706 se->data.client.password = NULL;
1707 se->data.client.cypher = NULL;
1708 #endif
1709 }
1711 return (0);
1712 } /* }}} int sockent_init */
1714 /* Open the file descriptors for a initialized sockent structure. */
1715 static int sockent_open (sockent_t *se) /* {{{ */
1716 {
1717 struct addrinfo ai_hints;
1718 struct addrinfo *ai_list, *ai_ptr;
1719 int ai_return;
1721 const char *node;
1722 const char *service;
1724 if (se == NULL)
1725 return (-1);
1727 /* Set up the security structures. */
1728 #if HAVE_LIBGCRYPT /* {{{ */
1729 if (se->type == SOCKENT_TYPE_CLIENT)
1730 {
1731 if (se->data.client.security_level > SECURITY_LEVEL_NONE)
1732 {
1733 if ((se->data.client.username == NULL)
1734 || (se->data.client.password == NULL))
1735 {
1736 ERROR ("network plugin: Client socket with "
1737 "security requested, but no "
1738 "credentials are configured.");
1739 return (-1);
1740 }
1741 gcry_md_hash_buffer (GCRY_MD_SHA256,
1742 se->data.client.password_hash,
1743 se->data.client.password,
1744 strlen (se->data.client.password));
1745 }
1746 }
1747 else /* (se->type == SOCKENT_TYPE_SERVER) */
1748 {
1749 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1750 {
1751 if (se->data.server.auth_file == NULL)
1752 {
1753 ERROR ("network plugin: Server socket with "
1754 "security requested, but no "
1755 "password file is configured.");
1756 return (-1);
1757 }
1758 }
1759 if (se->data.server.auth_file != NULL)
1760 {
1761 se->data.server.userdb = fbh_create (se->data.server.auth_file);
1762 if (se->data.server.userdb == NULL)
1763 {
1764 ERROR ("network plugin: Reading password file "
1765 "`%s' failed.",
1766 se->data.server.auth_file);
1767 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1768 return (-1);
1769 }
1770 }
1771 }
1772 #endif /* }}} HAVE_LIBGCRYPT */
1774 node = se->node;
1775 service = se->service;
1777 if (service == NULL)
1778 service = NET_DEFAULT_PORT;
1780 DEBUG ("network plugin: sockent_open: node = %s; service = %s;",
1781 node, service);
1783 memset (&ai_hints, 0, sizeof (ai_hints));
1784 ai_hints.ai_flags = 0;
1785 #ifdef AI_PASSIVE
1786 ai_hints.ai_flags |= AI_PASSIVE;
1787 #endif
1788 #ifdef AI_ADDRCONFIG
1789 ai_hints.ai_flags |= AI_ADDRCONFIG;
1790 #endif
1791 ai_hints.ai_family = AF_UNSPEC;
1792 ai_hints.ai_socktype = SOCK_DGRAM;
1793 ai_hints.ai_protocol = IPPROTO_UDP;
1795 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1796 if (ai_return != 0)
1797 {
1798 ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s",
1799 (se->node == NULL) ? "(null)" : se->node,
1800 (se->service == NULL) ? "(null)" : se->service,
1801 gai_strerror (ai_return));
1802 return (-1);
1803 }
1805 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1806 {
1807 int status;
1809 if (se->type == SOCKENT_TYPE_SERVER) /* {{{ */
1810 {
1811 int *tmp;
1813 tmp = realloc (se->data.server.fd,
1814 sizeof (*tmp) * (se->data.server.fd_num + 1));
1815 if (tmp == NULL)
1816 {
1817 ERROR ("network plugin: realloc failed.");
1818 continue;
1819 }
1820 se->data.server.fd = tmp;
1821 tmp = se->data.server.fd + se->data.server.fd_num;
1823 *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
1824 ai_ptr->ai_protocol);
1825 if (*tmp < 0)
1826 {
1827 char errbuf[1024];
1828 ERROR ("network plugin: socket(2) failed: %s",
1829 sstrerror (errno, errbuf,
1830 sizeof (errbuf)));
1831 continue;
1832 }
1834 status = network_bind_socket (*tmp, ai_ptr);
1835 if (status != 0)
1836 {
1837 close (*tmp);
1838 *tmp = -1;
1839 continue;
1840 }
1842 se->data.server.fd_num++;
1843 continue;
1844 } /* }}} if (se->type == SOCKENT_TYPE_SERVER) */
1845 else /* if (se->type == SOCKENT_TYPE_CLIENT) {{{ */
1846 {
1847 se->data.client.fd = socket (ai_ptr->ai_family,
1848 ai_ptr->ai_socktype,
1849 ai_ptr->ai_protocol);
1850 if (se->data.client.fd < 0)
1851 {
1852 char errbuf[1024];
1853 ERROR ("network plugin: socket(2) failed: %s",
1854 sstrerror (errno, errbuf,
1855 sizeof (errbuf)));
1856 continue;
1857 }
1859 se->data.client.addr = malloc (sizeof (*se->data.client.addr));
1860 if (se->data.client.addr == NULL)
1861 {
1862 ERROR ("network plugin: malloc failed.");
1863 close (se->data.client.fd);
1864 se->data.client.fd = -1;
1865 continue;
1866 }
1868 memset (se->data.client.addr, 0, sizeof (*se->data.client.addr));
1869 assert (sizeof (*se->data.client.addr) >= ai_ptr->ai_addrlen);
1870 memcpy (se->data.client.addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1871 se->data.client.addrlen = ai_ptr->ai_addrlen;
1873 network_set_ttl (se, ai_ptr);
1875 /* We don't open more than one write-socket per
1876 * node/service pair.. */
1877 break;
1878 } /* }}} if (se->type == SOCKENT_TYPE_CLIENT) */
1879 } /* for (ai_list) */
1881 freeaddrinfo (ai_list);
1883 /* Check if all went well. */
1884 if (se->type == SOCKENT_TYPE_SERVER)
1885 {
1886 if (se->data.server.fd_num <= 0)
1887 return (-1);
1888 }
1889 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
1890 {
1891 if (se->data.client.fd < 0)
1892 return (-1);
1893 }
1895 return (0);
1896 } /* }}} int sockent_open */
1898 /* Add a sockent to the global list of sockets */
1899 static int sockent_add (sockent_t *se) /* {{{ */
1900 {
1901 sockent_t *last_ptr;
1903 if (se == NULL)
1904 return (-1);
1906 if (se->type == SOCKENT_TYPE_SERVER)
1907 {
1908 struct pollfd *tmp;
1909 size_t i;
1911 tmp = realloc (listen_sockets_pollfd,
1912 sizeof (*tmp) * (listen_sockets_num
1913 + se->data.server.fd_num));
1914 if (tmp == NULL)
1915 {
1916 ERROR ("network plugin: realloc failed.");
1917 return (-1);
1918 }
1919 listen_sockets_pollfd = tmp;
1920 tmp = listen_sockets_pollfd + listen_sockets_num;
1922 for (i = 0; i < se->data.server.fd_num; i++)
1923 {
1924 memset (tmp + i, 0, sizeof (*tmp));
1925 tmp[i].fd = se->data.server.fd[i];
1926 tmp[i].events = POLLIN | POLLPRI;
1927 tmp[i].revents = 0;
1928 }
1930 listen_sockets_num += se->data.server.fd_num;
1932 if (listen_sockets == NULL)
1933 {
1934 listen_sockets = se;
1935 return (0);
1936 }
1937 last_ptr = listen_sockets;
1938 }
1939 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
1940 {
1941 if (sending_sockets == NULL)
1942 {
1943 sending_sockets = se;
1944 return (0);
1945 }
1946 last_ptr = sending_sockets;
1947 }
1949 while (last_ptr->next != NULL)
1950 last_ptr = last_ptr->next;
1951 last_ptr->next = se;
1953 return (0);
1954 } /* }}} int sockent_add */
1956 static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */
1957 {
1958 while (42)
1959 {
1960 receive_list_entry_t *ent;
1961 sockent_t *se;
1963 /* Lock and wait for more data to come in */
1964 pthread_mutex_lock (&receive_list_lock);
1965 while ((listen_loop == 0)
1966 && (receive_list_head == NULL))
1967 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1969 /* Remove the head entry and unlock */
1970 ent = receive_list_head;
1971 if (ent != NULL)
1972 receive_list_head = ent->next;
1973 pthread_mutex_unlock (&receive_list_lock);
1975 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1976 * because we dispatch all missing packets before shutting down. */
1977 if (ent == NULL)
1978 break;
1980 /* Look for the correct `sockent_t' */
1981 se = listen_sockets;
1982 while (se != NULL)
1983 {
1984 size_t i;
1986 for (i = 0; i < se->data.server.fd_num; i++)
1987 if (se->data.server.fd[i] == ent->fd)
1988 break;
1990 if (i < se->data.server.fd_num)
1991 break;
1993 se = se->next;
1994 }
1996 if (se == NULL)
1997 {
1998 ERROR ("network plugin: Got packet from FD %i, but can't "
1999 "find an appropriate socket entry.",
2000 ent->fd);
2001 sfree (ent);
2002 continue;
2003 }
2005 parse_packet (se, ent->data, ent->data_len, /* flags = */ 0);
2006 sfree (ent);
2007 } /* while (42) */
2009 return (NULL);
2010 } /* }}} void *dispatch_thread */
2012 static int network_receive (void) /* {{{ */
2013 {
2014 char buffer[BUFF_SIZE];
2015 int buffer_len;
2017 int i;
2018 int status;
2020 receive_list_entry_t *private_list_head;
2021 receive_list_entry_t *private_list_tail;
2023 assert (listen_sockets_num > 0);
2025 private_list_head = NULL;
2026 private_list_tail = NULL;
2028 while (listen_loop == 0)
2029 {
2030 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
2032 if (status <= 0)
2033 {
2034 char errbuf[1024];
2035 if (errno == EINTR)
2036 continue;
2037 ERROR ("poll failed: %s",
2038 sstrerror (errno, errbuf, sizeof (errbuf)));
2039 return (-1);
2040 }
2042 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
2043 {
2044 receive_list_entry_t *ent;
2046 if ((listen_sockets_pollfd[i].revents
2047 & (POLLIN | POLLPRI)) == 0)
2048 continue;
2049 status--;
2051 buffer_len = recv (listen_sockets_pollfd[i].fd,
2052 buffer, sizeof (buffer),
2053 0 /* no flags */);
2054 if (buffer_len < 0)
2055 {
2056 char errbuf[1024];
2057 ERROR ("recv failed: %s",
2058 sstrerror (errno, errbuf,
2059 sizeof (errbuf)));
2060 return (-1);
2061 }
2063 /* TODO: Possible performance enhancement: Do not free
2064 * these entries in the dispatch thread but put them in
2065 * another list, so we don't have to allocate more and
2066 * more of these structures. */
2067 ent = malloc (sizeof (receive_list_entry_t));
2068 if (ent == NULL)
2069 {
2070 ERROR ("network plugin: malloc failed.");
2071 return (-1);
2072 }
2073 memset (ent, 0, sizeof (receive_list_entry_t));
2074 ent->fd = listen_sockets_pollfd[i].fd;
2075 ent->next = NULL;
2077 /* Hopefully this be optimized out by the compiler. It
2078 * might help prevent stupid bugs in the future though.
2079 */
2080 assert (sizeof (ent->data) == sizeof (buffer));
2082 memcpy (ent->data, buffer, buffer_len);
2083 ent->data_len = buffer_len;
2085 if (private_list_head == NULL)
2086 private_list_head = ent;
2087 else
2088 private_list_tail->next = ent;
2089 private_list_tail = ent;
2091 /* Do not block here. Blocking here has led to
2092 * insufficient performance in the past. */
2093 if (pthread_mutex_trylock (&receive_list_lock) == 0)
2094 {
2095 if (receive_list_head == NULL)
2096 receive_list_head = private_list_head;
2097 else
2098 receive_list_tail->next = private_list_head;
2099 receive_list_tail = private_list_tail;
2101 private_list_head = NULL;
2102 private_list_tail = NULL;
2104 pthread_cond_signal (&receive_list_cond);
2105 pthread_mutex_unlock (&receive_list_lock);
2106 }
2107 } /* for (listen_sockets_pollfd) */
2108 } /* while (listen_loop == 0) */
2110 /* Make sure everything is dispatched before exiting. */
2111 if (private_list_head != NULL)
2112 {
2113 pthread_mutex_lock (&receive_list_lock);
2115 if (receive_list_head == NULL)
2116 receive_list_head = private_list_head;
2117 else
2118 receive_list_tail->next = private_list_head;
2119 receive_list_tail = private_list_tail;
2121 private_list_head = NULL;
2122 private_list_tail = NULL;
2124 pthread_cond_signal (&receive_list_cond);
2125 pthread_mutex_unlock (&receive_list_lock);
2126 }
2128 return (0);
2129 } /* }}} int network_receive */
2131 static void *receive_thread (void __attribute__((unused)) *arg)
2132 {
2133 return (network_receive () ? (void *) 1 : (void *) 0);
2134 } /* void *receive_thread */
2136 static void network_init_buffer (void)
2137 {
2138 memset (send_buffer, 0, sizeof (send_buffer));
2139 send_buffer_ptr = send_buffer;
2140 send_buffer_fill = 0;
2142 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
2143 } /* int network_init_buffer */
2145 static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */
2146 const char *buffer, size_t buffer_size)
2147 {
2148 int status;
2150 while (42)
2151 {
2152 status = sendto (se->data.client.fd, buffer, buffer_size,
2153 /* flags = */ 0,
2154 (struct sockaddr *) se->data.client.addr,
2155 se->data.client.addrlen);
2156 if (status < 0)
2157 {
2158 char errbuf[1024];
2159 if (errno == EINTR)
2160 continue;
2161 ERROR ("network plugin: sendto failed: %s",
2162 sstrerror (errno, errbuf,
2163 sizeof (errbuf)));
2164 break;
2165 }
2167 break;
2168 } /* while (42) */
2169 } /* }}} void networt_send_buffer_plain */
2171 #if HAVE_LIBGCRYPT
2172 #define BUFFER_ADD(p,s) do { \
2173 memcpy (buffer + buffer_offset, (p), (s)); \
2174 buffer_offset += (s); \
2175 } while (0)
2177 static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */
2178 const char *in_buffer, size_t in_buffer_size)
2179 {
2180 part_signature_sha256_t ps;
2181 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2182 size_t buffer_offset;
2183 size_t username_len;
2185 gcry_md_hd_t hd;
2186 gcry_error_t err;
2187 unsigned char *hash;
2189 hd = NULL;
2190 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
2191 if (err != 0)
2192 {
2193 ERROR ("network plugin: Creating HMAC object failed: %s",
2194 gcry_strerror (err));
2195 return;
2196 }
2198 err = gcry_md_setkey (hd, se->data.client.password,
2199 strlen (se->data.client.password));
2200 if (err != 0)
2201 {
2202 ERROR ("network plugin: gcry_md_setkey failed: %s",
2203 gcry_strerror (err));
2204 gcry_md_close (hd);
2205 return;
2206 }
2208 username_len = strlen (se->data.client.username);
2209 if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE))
2210 {
2211 ERROR ("network plugin: Username too long: %s",
2212 se->data.client.username);
2213 return;
2214 }
2216 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE,
2217 se->data.client.username, username_len);
2218 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len,
2219 in_buffer, in_buffer_size);
2221 /* Initialize the `ps' structure. */
2222 memset (&ps, 0, sizeof (ps));
2223 ps.head.type = htons (TYPE_SIGN_SHA256);
2224 ps.head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len);
2226 /* Calculate the hash value. */
2227 gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE,
2228 username_len + in_buffer_size);
2229 hash = gcry_md_read (hd, GCRY_MD_SHA256);
2230 if (hash == NULL)
2231 {
2232 ERROR ("network plugin: gcry_md_read failed.");
2233 gcry_md_close (hd);
2234 return;
2235 }
2236 memcpy (ps.hash, hash, sizeof (ps.hash));
2238 /* Add the header */
2239 buffer_offset = 0;
2241 BUFFER_ADD (&ps.head.type, sizeof (ps.head.type));
2242 BUFFER_ADD (&ps.head.length, sizeof (ps.head.length));
2243 BUFFER_ADD (ps.hash, sizeof (ps.hash));
2245 assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE);
2247 gcry_md_close (hd);
2248 hd = NULL;
2250 buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size;
2251 networt_send_buffer_plain (se, buffer, buffer_offset);
2252 } /* }}} void networt_send_buffer_signed */
2254 static void networt_send_buffer_encrypted (sockent_t *se, /* {{{ */
2255 const char *in_buffer, size_t in_buffer_size)
2256 {
2257 part_encryption_aes256_t pea;
2258 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2259 size_t buffer_size;
2260 size_t buffer_offset;
2261 size_t header_size;
2262 size_t username_len;
2263 gcry_error_t err;
2264 gcry_cipher_hd_t cypher;
2266 /* Initialize the header fields */
2267 memset (&pea, 0, sizeof (pea));
2268 pea.head.type = htons (TYPE_ENCR_AES256);
2270 pea.username = se->data.client.username;
2272 username_len = strlen (pea.username);
2273 if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE)
2274 {
2275 ERROR ("network plugin: Username too long: %s", pea.username);
2276 return;
2277 }
2279 buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size;
2280 header_size = PART_ENCRYPTION_AES256_SIZE + username_len
2281 - sizeof (pea.hash);
2283 assert (buffer_size <= sizeof (buffer));
2284 DEBUG ("network plugin: networt_send_buffer_encrypted: "
2285 "buffer_size = %zu;", buffer_size);
2287 pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE
2288 + username_len + in_buffer_size));
2289 pea.username_length = htons ((uint16_t) username_len);
2291 /* Chose a random initialization vector. */
2292 gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2294 /* Create hash of the payload */
2295 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2297 /* Initialize the buffer */
2298 buffer_offset = 0;
2299 memset (buffer, 0, sizeof (buffer));
2302 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2303 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2304 BUFFER_ADD (&pea.username_length, sizeof (pea.username_length));
2305 BUFFER_ADD (pea.username, username_len);
2306 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2307 assert (buffer_offset == header_size);
2308 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2309 BUFFER_ADD (in_buffer, in_buffer_size);
2311 assert (buffer_offset == buffer_size);
2313 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
2314 se->data.client.password);
2315 if (cypher == NULL)
2316 return;
2318 /* Encrypt the buffer in-place */
2319 err = gcry_cipher_encrypt (cypher,
2320 buffer + header_size,
2321 buffer_size - header_size,
2322 /* in = */ NULL, /* in len = */ 0);
2323 if (err != 0)
2324 {
2325 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2326 gcry_strerror (err));
2327 return;
2328 }
2330 /* Send it out without further modifications */
2331 networt_send_buffer_plain (se, buffer, buffer_size);
2332 } /* }}} void networt_send_buffer_encrypted */
2333 #undef BUFFER_ADD
2334 #endif /* HAVE_LIBGCRYPT */
2336 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2337 {
2338 sockent_t *se;
2340 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2342 for (se = sending_sockets; se != NULL; se = se->next)
2343 {
2344 #if HAVE_LIBGCRYPT
2345 if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT)
2346 networt_send_buffer_encrypted (se, buffer, buffer_len);
2347 else if (se->data.client.security_level == SECURITY_LEVEL_SIGN)
2348 networt_send_buffer_signed (se, buffer, buffer_len);
2349 else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */
2350 #endif /* HAVE_LIBGCRYPT */
2351 networt_send_buffer_plain (se, buffer, buffer_len);
2352 } /* for (sending_sockets) */
2353 } /* }}} void network_send_buffer */
2355 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
2356 value_list_t *vl_def,
2357 const data_set_t *ds, const value_list_t *vl)
2358 {
2359 char *buffer_orig = buffer;
2361 if (strcmp (vl_def->host, vl->host) != 0)
2362 {
2363 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2364 vl->host, strlen (vl->host)) != 0)
2365 return (-1);
2366 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2367 }
2369 if (vl_def->time != vl->time)
2370 {
2371 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
2372 (uint64_t) vl->time))
2373 return (-1);
2374 vl_def->time = vl->time;
2375 }
2377 if (vl_def->interval != vl->interval)
2378 {
2379 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
2380 (uint64_t) vl->interval))
2381 return (-1);
2382 vl_def->interval = vl->interval;
2383 }
2385 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2386 {
2387 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2388 vl->plugin, strlen (vl->plugin)) != 0)
2389 return (-1);
2390 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2391 }
2393 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2394 {
2395 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2396 vl->plugin_instance,
2397 strlen (vl->plugin_instance)) != 0)
2398 return (-1);
2399 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2400 }
2402 if (strcmp (vl_def->type, vl->type) != 0)
2403 {
2404 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2405 vl->type, strlen (vl->type)) != 0)
2406 return (-1);
2407 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2408 }
2410 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2411 {
2412 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2413 vl->type_instance,
2414 strlen (vl->type_instance)) != 0)
2415 return (-1);
2416 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2417 }
2419 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2420 return (-1);
2422 return (buffer - buffer_orig);
2423 } /* }}} int add_to_buffer */
2425 static void flush_buffer (void)
2426 {
2427 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2428 send_buffer_fill);
2430 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2431 network_init_buffer ();
2432 }
2434 static int network_write (const data_set_t *ds, const value_list_t *vl,
2435 user_data_t __attribute__((unused)) *user_data)
2436 {
2437 int status;
2439 /* If the value is already in the cache, we have received it via the
2440 * network. We write it again if forwarding is activated. It's then in
2441 * the cache and should we receive it again we will ignore it. */
2442 status = cache_check (vl);
2443 if ((network_config_forward == 0)
2444 && (status != 0))
2445 return (0);
2447 pthread_mutex_lock (&send_buffer_lock);
2449 status = add_to_buffer (send_buffer_ptr,
2450 sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
2451 &send_buffer_vl,
2452 ds, vl);
2453 if (status >= 0)
2454 {
2455 /* status == bytes added to the buffer */
2456 send_buffer_fill += status;
2457 send_buffer_ptr += status;
2458 }
2459 else
2460 {
2461 flush_buffer ();
2463 status = add_to_buffer (send_buffer_ptr,
2464 sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
2465 &send_buffer_vl,
2466 ds, vl);
2468 if (status >= 0)
2469 {
2470 send_buffer_fill += status;
2471 send_buffer_ptr += status;
2472 }
2473 }
2475 if (status < 0)
2476 {
2477 ERROR ("network plugin: Unable to append to the "
2478 "buffer for some weird reason");
2479 }
2480 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
2481 {
2482 flush_buffer ();
2483 }
2485 pthread_mutex_unlock (&send_buffer_lock);
2487 return ((status < 0) ? -1 : 0);
2488 } /* int network_write */
2490 static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
2491 int *retval)
2492 {
2493 if ((ci->values_num != 1)
2494 || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
2495 && (ci->values[0].type != OCONFIG_TYPE_STRING)))
2496 {
2497 ERROR ("network plugin: The `%s' config option needs "
2498 "exactly one boolean argument.", ci->key);
2499 return (-1);
2500 }
2502 if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
2503 {
2504 if (ci->values[0].value.boolean)
2505 *retval = 1;
2506 else
2507 *retval = 0;
2508 }
2509 else
2510 {
2511 char *str = ci->values[0].value.string;
2513 if ((strcasecmp ("true", str) == 0)
2514 || (strcasecmp ("yes", str) == 0)
2515 || (strcasecmp ("on", str) == 0))
2516 *retval = 1;
2517 else if ((strcasecmp ("false", str) == 0)
2518 || (strcasecmp ("no", str) == 0)
2519 || (strcasecmp ("off", str) == 0))
2520 *retval = 0;
2521 else
2522 {
2523 ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
2524 "option as boolean value.",
2525 str, ci->key);
2526 return (-1);
2527 }
2528 }
2530 return (0);
2531 } /* }}} int network_config_set_boolean */
2533 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2534 {
2535 int tmp;
2536 if ((ci->values_num != 1)
2537 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2538 {
2539 WARNING ("network plugin: The `TimeToLive' config option needs exactly "
2540 "one numeric argument.");
2541 return (-1);
2542 }
2544 tmp = (int) ci->values[0].value.number;
2545 if ((tmp > 0) && (tmp <= 255))
2546 network_config_ttl = tmp;
2548 return (0);
2549 } /* }}} int network_config_set_ttl */
2551 #if HAVE_LIBGCRYPT
2552 static int network_config_set_string (const oconfig_item_t *ci, /* {{{ */
2553 char **ret_string)
2554 {
2555 char *tmp;
2556 if ((ci->values_num != 1)
2557 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2558 {
2559 WARNING ("network plugin: The `%s' config option needs exactly "
2560 "one string argument.", ci->key);
2561 return (-1);
2562 }
2564 tmp = strdup (ci->values[0].value.string);
2565 if (tmp == NULL)
2566 return (-1);
2568 sfree (*ret_string);
2569 *ret_string = tmp;
2571 return (0);
2572 } /* }}} int network_config_set_string */
2573 #endif /* HAVE_LIBGCRYPT */
2575 #if HAVE_LIBGCRYPT
2576 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
2577 int *retval)
2578 {
2579 char *str;
2580 if ((ci->values_num != 1)
2581 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2582 {
2583 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
2584 "one string argument.");
2585 return (-1);
2586 }
2588 str = ci->values[0].value.string;
2589 if (strcasecmp ("Encrypt", str) == 0)
2590 *retval = SECURITY_LEVEL_ENCRYPT;
2591 else if (strcasecmp ("Sign", str) == 0)
2592 *retval = SECURITY_LEVEL_SIGN;
2593 else if (strcasecmp ("None", str) == 0)
2594 *retval = SECURITY_LEVEL_NONE;
2595 else
2596 {
2597 WARNING ("network plugin: Unknown security level: %s.", str);
2598 return (-1);
2599 }
2601 return (0);
2602 } /* }}} int network_config_set_security_level */
2603 #endif /* HAVE_LIBGCRYPT */
2605 static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */
2606 {
2607 sockent_t *se;
2608 int status;
2609 int i;
2611 if ((ci->values_num < 1) || (ci->values_num > 2)
2612 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2613 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2614 {
2615 ERROR ("network plugin: The `%s' config option needs "
2616 "one or two string arguments.", ci->key);
2617 return (-1);
2618 }
2620 se = malloc (sizeof (*se));
2621 if (se == NULL)
2622 {
2623 ERROR ("network plugin: malloc failed.");
2624 return (-1);
2625 }
2626 sockent_init (se, SOCKENT_TYPE_SERVER);
2628 se->node = strdup (ci->values[0].value.string);
2629 if (ci->values_num >= 2)
2630 se->service = strdup (ci->values[1].value.string);
2632 for (i = 0; i < ci->children_num; i++)
2633 {
2634 oconfig_item_t *child = ci->children + i;
2636 #if HAVE_LIBGCRYPT
2637 if (strcasecmp ("AuthFile", child->key) == 0)
2638 network_config_set_string (child, &se->data.server.auth_file);
2639 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2640 network_config_set_security_level (child,
2641 &se->data.server.security_level);
2642 else
2643 #endif /* HAVE_LIBGCRYPT */
2644 {
2645 WARNING ("network plugin: Option `%s' is not allowed here.",
2646 child->key);
2647 }
2648 }
2650 #if HAVE_LIBGCRYPT
2651 if ((se->data.server.security_level > SECURITY_LEVEL_NONE)
2652 && (se->data.server.auth_file == NULL))
2653 {
2654 ERROR ("network plugin: A security level higher than `none' was "
2655 "requested, but no AuthFile option was given. Cowardly refusing to "
2656 "open this socket!");
2657 sockent_destroy (se);
2658 return (-1);
2659 }
2660 #endif /* HAVE_LIBGCRYPT */
2662 status = sockent_open (se);
2663 if (status != 0)
2664 {
2665 ERROR ("network plugin: network_config_add_listen: sockent_open failed.");
2666 sockent_destroy (se);
2667 return (-1);
2668 }
2670 status = sockent_add (se);
2671 if (status != 0)
2672 {
2673 ERROR ("network plugin: network_config_add_listen: sockent_add failed.");
2674 sockent_destroy (se);
2675 return (-1);
2676 }
2678 return (0);
2679 } /* }}} int network_config_add_listen */
2681 static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */
2682 {
2683 sockent_t *se;
2684 int status;
2685 int i;
2687 if ((ci->values_num < 1) || (ci->values_num > 2)
2688 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2689 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2690 {
2691 ERROR ("network plugin: The `%s' config option needs "
2692 "one or two string arguments.", ci->key);
2693 return (-1);
2694 }
2696 se = malloc (sizeof (*se));
2697 if (se == NULL)
2698 {
2699 ERROR ("network plugin: malloc failed.");
2700 return (-1);
2701 }
2702 sockent_init (se, SOCKENT_TYPE_CLIENT);
2704 se->node = strdup (ci->values[0].value.string);
2705 if (ci->values_num >= 2)
2706 se->service = strdup (ci->values[1].value.string);
2708 for (i = 0; i < ci->children_num; i++)
2709 {
2710 oconfig_item_t *child = ci->children + i;
2712 #if HAVE_LIBGCRYPT
2713 if (strcasecmp ("Username", child->key) == 0)
2714 network_config_set_string (child, &se->data.client.username);
2715 else if (strcasecmp ("Password", child->key) == 0)
2716 network_config_set_string (child, &se->data.client.password);
2717 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2718 network_config_set_security_level (child,
2719 &se->data.client.security_level);
2720 else
2721 #endif /* HAVE_LIBGCRYPT */
2722 {
2723 WARNING ("network plugin: Option `%s' is not allowed here.",
2724 child->key);
2725 }
2726 }
2728 #if HAVE_LIBGCRYPT
2729 if ((se->data.client.security_level > SECURITY_LEVEL_NONE)
2730 && ((se->data.client.username == NULL)
2731 || (se->data.client.password == NULL)))
2732 {
2733 ERROR ("network plugin: A security level higher than `none' was "
2734 "requested, but no Username or Password option was given. "
2735 "Cowardly refusing to open this socket!");
2736 sockent_destroy (se);
2737 return (-1);
2738 }
2739 #endif /* HAVE_LIBGCRYPT */
2741 status = sockent_open (se);
2742 if (status != 0)
2743 {
2744 ERROR ("network plugin: network_config_add_server: sockent_open failed.");
2745 sockent_destroy (se);
2746 return (-1);
2747 }
2749 status = sockent_add (se);
2750 if (status != 0)
2751 {
2752 ERROR ("network plugin: network_config_add_server: sockent_add failed.");
2753 sockent_destroy (se);
2754 return (-1);
2755 }
2757 return (0);
2758 } /* }}} int network_config_add_server */
2760 static int network_config_set_cache_flush (const oconfig_item_t *ci) /* {{{ */
2761 {
2762 int tmp;
2763 if ((ci->values_num != 1)
2764 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2765 {
2766 WARNING ("network plugin: The `CacheFlush' config option needs exactly "
2767 "one numeric argument.");
2768 return (-1);
2769 }
2771 tmp = (int) ci->values[0].value.number;
2772 if (tmp > 0)
2773 cache_flush_interval = tmp;
2775 return (0);
2776 } /* }}} int network_config_set_cache_flush */
2778 static int network_config (oconfig_item_t *ci) /* {{{ */
2779 {
2780 int i;
2782 for (i = 0; i < ci->children_num; i++)
2783 {
2784 oconfig_item_t *child = ci->children + i;
2786 if (strcasecmp ("Listen", child->key) == 0)
2787 network_config_add_listen (child);
2788 else if (strcasecmp ("Server", child->key) == 0)
2789 network_config_add_server (child);
2790 else if (strcasecmp ("TimeToLive", child->key) == 0)
2791 network_config_set_ttl (child);
2792 else if (strcasecmp ("Forward", child->key) == 0)
2793 network_config_set_boolean (child, &network_config_forward);
2794 else if (strcasecmp ("CacheFlush", child->key) == 0)
2795 network_config_set_cache_flush (child);
2796 else
2797 {
2798 WARNING ("network plugin: Option `%s' is not allowed here.",
2799 child->key);
2800 }
2801 }
2803 return (0);
2804 } /* }}} int network_config */
2806 static int network_notification (const notification_t *n,
2807 user_data_t __attribute__((unused)) *user_data)
2808 {
2809 char buffer[BUFF_SIZE];
2810 char *buffer_ptr = buffer;
2811 int buffer_free = sizeof (buffer);
2812 int status;
2814 memset (buffer, '\0', sizeof (buffer));
2817 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
2818 (uint64_t) n->time);
2819 if (status != 0)
2820 return (-1);
2822 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
2823 (uint64_t) n->severity);
2824 if (status != 0)
2825 return (-1);
2827 if (strlen (n->host) > 0)
2828 {
2829 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
2830 n->host, strlen (n->host));
2831 if (status != 0)
2832 return (-1);
2833 }
2835 if (strlen (n->plugin) > 0)
2836 {
2837 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
2838 n->plugin, strlen (n->plugin));
2839 if (status != 0)
2840 return (-1);
2841 }
2843 if (strlen (n->plugin_instance) > 0)
2844 {
2845 status = write_part_string (&buffer_ptr, &buffer_free,
2846 TYPE_PLUGIN_INSTANCE,
2847 n->plugin_instance, strlen (n->plugin_instance));
2848 if (status != 0)
2849 return (-1);
2850 }
2852 if (strlen (n->type) > 0)
2853 {
2854 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
2855 n->type, strlen (n->type));
2856 if (status != 0)
2857 return (-1);
2858 }
2860 if (strlen (n->type_instance) > 0)
2861 {
2862 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
2863 n->type_instance, strlen (n->type_instance));
2864 if (status != 0)
2865 return (-1);
2866 }
2868 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
2869 n->message, strlen (n->message));
2870 if (status != 0)
2871 return (-1);
2873 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
2875 return (0);
2876 } /* int network_notification */
2878 static int network_shutdown (void)
2879 {
2880 listen_loop++;
2882 /* Kill the listening thread */
2883 if (receive_thread_running != 0)
2884 {
2885 INFO ("network plugin: Stopping receive thread.");
2886 pthread_kill (receive_thread_id, SIGTERM);
2887 pthread_join (receive_thread_id, NULL /* no return value */);
2888 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
2889 receive_thread_running = 0;
2890 }
2892 /* Shutdown the dispatching thread */
2893 if (dispatch_thread_running != 0)
2894 {
2895 INFO ("network plugin: Stopping dispatch thread.");
2896 pthread_mutex_lock (&receive_list_lock);
2897 pthread_cond_broadcast (&receive_list_cond);
2898 pthread_mutex_unlock (&receive_list_lock);
2899 pthread_join (dispatch_thread_id, /* ret = */ NULL);
2900 dispatch_thread_running = 0;
2901 }
2903 sockent_destroy (listen_sockets);
2905 if (send_buffer_fill > 0)
2906 flush_buffer ();
2908 if (cache_tree != NULL)
2909 {
2910 void *key;
2911 void *value;
2913 while (c_avl_pick (cache_tree, &key, &value) == 0)
2914 {
2915 sfree (key);
2916 sfree (value);
2917 }
2918 c_avl_destroy (cache_tree);
2919 cache_tree = NULL;
2920 }
2922 /* TODO: Close `sending_sockets' */
2924 plugin_unregister_config ("network");
2925 plugin_unregister_init ("network");
2926 plugin_unregister_write ("network");
2927 plugin_unregister_shutdown ("network");
2929 /* Let the init function do it's move again ;) */
2930 cache_flush_last = 0;
2932 return (0);
2933 } /* int network_shutdown */
2935 static int network_init (void)
2936 {
2937 /* Check if we were already initialized. If so, just return - there's
2938 * nothing more to do (for now, that is). */
2939 if (cache_flush_last != 0)
2940 return (0);
2942 #if HAVE_LIBGCRYPT
2943 gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
2944 gcry_control (GCRYCTL_INIT_SECMEM, 32768, 0);
2945 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
2946 #endif
2948 plugin_register_shutdown ("network", network_shutdown);
2950 network_init_buffer ();
2952 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
2953 cache_flush_last = time (NULL);
2955 /* setup socket(s) and so on */
2956 if (sending_sockets != NULL)
2957 {
2958 plugin_register_write ("network", network_write,
2959 /* user_data = */ NULL);
2960 plugin_register_notification ("network", network_notification,
2961 /* user_data = */ NULL);
2962 }
2964 /* If no threads need to be started, return here. */
2965 if ((listen_sockets_num == 0)
2966 || ((dispatch_thread_running != 0)
2967 && (receive_thread_running != 0)))
2968 return (0);
2970 if (dispatch_thread_running == 0)
2971 {
2972 int status;
2973 status = pthread_create (&dispatch_thread_id,
2974 NULL /* no attributes */,
2975 dispatch_thread,
2976 NULL /* no argument */);
2977 if (status != 0)
2978 {
2979 char errbuf[1024];
2980 ERROR ("network: pthread_create failed: %s",
2981 sstrerror (errno, errbuf,
2982 sizeof (errbuf)));
2983 }
2984 else
2985 {
2986 dispatch_thread_running = 1;
2987 }
2988 }
2990 if (receive_thread_running == 0)
2991 {
2992 int status;
2993 status = pthread_create (&receive_thread_id,
2994 NULL /* no attributes */,
2995 receive_thread,
2996 NULL /* no argument */);
2997 if (status != 0)
2998 {
2999 char errbuf[1024];
3000 ERROR ("network: pthread_create failed: %s",
3001 sstrerror (errno, errbuf,
3002 sizeof (errbuf)));
3003 }
3004 else
3005 {
3006 receive_thread_running = 1;
3007 }
3008 }
3010 return (0);
3011 } /* int network_init */
3013 /*
3014 * The flush option of the network plugin cannot flush individual identifiers.
3015 * All the values are added to a buffer and sent when the buffer is full, the
3016 * requested value may or may not be in there, it's not worth finding out. We
3017 * just send the buffer if `flush' is called - if the requested value was in
3018 * there, good. If not, well, then there is nothing to flush.. -octo
3019 */
3020 static int network_flush (int timeout,
3021 const char __attribute__((unused)) *identifier,
3022 user_data_t __attribute__((unused)) *user_data)
3023 {
3024 pthread_mutex_lock (&send_buffer_lock);
3026 if (((time (NULL) - cache_flush_last) >= timeout)
3027 && (send_buffer_fill > 0))
3028 {
3029 flush_buffer ();
3030 }
3032 pthread_mutex_unlock (&send_buffer_lock);
3034 return (0);
3035 } /* int network_flush */
3037 void module_register (void)
3038 {
3039 plugin_register_complex_config ("network", network_config);
3040 plugin_register_init ("network", network_init);
3041 plugin_register_flush ("network", network_flush,
3042 /* user_data = */ NULL);
3043 } /* void module_register */
3045 /* vim: set fdm=marker : */