75f52df651c56f6dbdeabe7631dfb0653c145539
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 #define _BSD_SOURCE /* For struct ip_mreq */
24 #include "collectd.h"
25 #include "plugin.h"
26 #include "common.h"
27 #include "configfile.h"
28 #include "utils_fbhash.h"
29 #include "utils_avltree.h"
31 #include "network.h"
33 #if HAVE_PTHREAD_H
34 # include <pthread.h>
35 #endif
36 #if HAVE_SYS_SOCKET_H
37 # include <sys/socket.h>
38 #endif
39 #if HAVE_NETDB_H
40 # include <netdb.h>
41 #endif
42 #if HAVE_NETINET_IN_H
43 # include <netinet/in.h>
44 #endif
45 #if HAVE_ARPA_INET_H
46 # include <arpa/inet.h>
47 #endif
48 #if HAVE_POLL_H
49 # include <poll.h>
50 #endif
52 #if HAVE_LIBGCRYPT
53 # include <gcrypt.h>
54 #endif
56 /* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */
57 /* #define BUFF_SIZE 1452 */
59 #ifndef IPV6_ADD_MEMBERSHIP
60 # ifdef IPV6_JOIN_GROUP
61 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
62 # else
63 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
64 # endif
65 #endif /* !IP_ADD_MEMBERSHIP */
67 /* Buffer size to allocate. */
68 #define BUFF_SIZE 1024
70 /*
71 * Maximum size required for encryption / signing:
72 *
73 * 42 bytes for the encryption header
74 * + 64 bytes for the username
75 * -----------
76 * = 106 bytes
77 */
78 #define BUFF_SIG_SIZE 106
80 /*
81 * Private data types
82 */
83 #define SECURITY_LEVEL_NONE 0
84 #if HAVE_LIBGCRYPT
85 # define SECURITY_LEVEL_SIGN 1
86 # define SECURITY_LEVEL_ENCRYPT 2
87 #endif
88 struct sockent_client
89 {
90 int fd;
91 struct sockaddr_storage *addr;
92 socklen_t addrlen;
93 #if HAVE_LIBGCRYPT
94 int security_level;
95 char *username;
96 char *password;
97 gcry_cipher_hd_t cypher;
98 unsigned char password_hash[32];
99 #endif
100 };
102 struct sockent_server
103 {
104 int *fd;
105 size_t fd_num;
106 #if HAVE_LIBGCRYPT
107 int security_level;
108 char *auth_file;
109 fbhash_t *userdb;
110 gcry_cipher_hd_t cypher;
111 #endif
112 };
114 typedef struct sockent
115 {
116 #define SOCKENT_TYPE_CLIENT 1
117 #define SOCKENT_TYPE_SERVER 2
118 int type;
120 char *node;
121 char *service;
123 union
124 {
125 struct sockent_client client;
126 struct sockent_server server;
127 } data;
129 struct sockent *next;
130 } sockent_t;
132 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
133 * 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
134 * +-------+-----------------------+-------------------------------+
135 * ! Ver. ! ! Length !
136 * +-------+-----------------------+-------------------------------+
137 */
138 struct part_header_s
139 {
140 uint16_t type;
141 uint16_t length;
142 };
143 typedef struct part_header_s part_header_t;
145 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
146 * 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
147 * +-------------------------------+-------------------------------+
148 * ! Type ! Length !
149 * +-------------------------------+-------------------------------+
150 * : (Length - 4) Bytes :
151 * +---------------------------------------------------------------+
152 */
153 struct part_string_s
154 {
155 part_header_t *head;
156 char *value;
157 };
158 typedef struct part_string_s part_string_t;
160 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
161 * 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
162 * +-------------------------------+-------------------------------+
163 * ! Type ! Length !
164 * +-------------------------------+-------------------------------+
165 * : (Length - 4 == 2 || 4 || 8) Bytes :
166 * +---------------------------------------------------------------+
167 */
168 struct part_number_s
169 {
170 part_header_t *head;
171 uint64_t *value;
172 };
173 typedef struct part_number_s part_number_t;
175 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
176 * 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
177 * +-------------------------------+-------------------------------+
178 * ! Type ! Length !
179 * +-------------------------------+---------------+---------------+
180 * ! Num of values ! Type0 ! Type1 !
181 * +-------------------------------+---------------+---------------+
182 * ! Value0 !
183 * ! !
184 * +---------------------------------------------------------------+
185 * ! Value1 !
186 * ! !
187 * +---------------------------------------------------------------+
188 */
189 struct part_values_s
190 {
191 part_header_t *head;
192 uint16_t *num_values;
193 uint8_t *values_types;
194 value_t *values;
195 };
196 typedef struct part_values_s part_values_t;
198 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
199 * 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
200 * +-------------------------------+-------------------------------+
201 * ! Type ! Length !
202 * +-------------------------------+-------------------------------+
203 * ! Hash (Bits 0 - 31) !
204 * : : :
205 * ! Hash (Bits 224 - 255) !
206 * +---------------------------------------------------------------+
207 */
208 /* Minimum size */
209 #define PART_SIGNATURE_SHA256_SIZE 36
210 struct part_signature_sha256_s
211 {
212 part_header_t head;
213 unsigned char hash[32];
214 char *username;
215 };
216 typedef struct part_signature_sha256_s part_signature_sha256_t;
218 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
219 * 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
220 * +-------------------------------+-------------------------------+
221 * ! Type ! Length !
222 * +-------------------------------+-------------------------------+
223 * ! Original length ! Padding (0 - 15 bytes) !
224 * +-------------------------------+-------------------------------+
225 * ! Hash (Bits 0 - 31) !
226 * : : :
227 * ! Hash (Bits 128 - 159) !
228 * +---------------------------------------------------------------+
229 */
230 /* Minimum size */
231 #define PART_ENCRYPTION_AES256_SIZE 42
232 struct part_encryption_aes256_s
233 {
234 part_header_t head;
235 uint16_t username_length;
236 char *username;
237 unsigned char iv[16];
238 /* <encrypted> */
239 unsigned char hash[20];
240 /* <payload /> */
241 /* </encrypted> */
242 };
243 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
245 struct receive_list_entry_s
246 {
247 char data[BUFF_SIZE];
248 int data_len;
249 int fd;
250 struct receive_list_entry_s *next;
251 };
252 typedef struct receive_list_entry_s receive_list_entry_t;
254 /*
255 * Private variables
256 */
257 static int network_config_ttl = 0;
258 static int network_config_forward = 0;
260 static sockent_t *sending_sockets = NULL;
262 static receive_list_entry_t *receive_list_head = NULL;
263 static receive_list_entry_t *receive_list_tail = NULL;
264 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
265 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
267 static sockent_t *listen_sockets = NULL;
268 static struct pollfd *listen_sockets_pollfd = NULL;
269 static size_t listen_sockets_num = 0;
271 /* The receive and dispatch threads will run as long as `listen_loop' is set to
272 * zero. */
273 static int listen_loop = 0;
274 static int receive_thread_running = 0;
275 static pthread_t receive_thread_id;
276 static int dispatch_thread_running = 0;
277 static pthread_t dispatch_thread_id;
279 /* Buffer in which to-be-sent network packets are constructed. */
280 static char send_buffer[BUFF_SIZE];
281 static char *send_buffer_ptr;
282 static int send_buffer_fill;
283 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
284 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
286 /* In this cache we store all the values we received, so we can send out only
287 * those values which were *not* received via the network plugin, too. This is
288 * used for the `Forward false' option. */
289 static c_avl_tree_t *cache_tree = NULL;
290 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
291 static time_t cache_flush_last = 0;
292 static int cache_flush_interval = 1800;
294 /*
295 * Private functions
296 */
297 static int cache_flush (void)
298 {
299 char **keys = NULL;
300 int keys_num = 0;
302 char **tmp;
303 int i;
305 char *key;
306 time_t *value;
307 c_avl_iterator_t *iter;
309 time_t curtime = time (NULL);
311 iter = c_avl_get_iterator (cache_tree);
312 while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
313 {
314 if ((curtime - *value) <= cache_flush_interval)
315 continue;
316 tmp = (char **) realloc (keys,
317 (keys_num + 1) * sizeof (char *));
318 if (tmp == NULL)
319 {
320 sfree (keys);
321 c_avl_iterator_destroy (iter);
322 ERROR ("network plugin: cache_flush: realloc"
323 " failed.");
324 return (-1);
325 }
326 keys = tmp;
327 keys[keys_num] = key;
328 keys_num++;
329 } /* while (c_avl_iterator_next) */
330 c_avl_iterator_destroy (iter);
332 for (i = 0; i < keys_num; i++)
333 {
334 if (c_avl_remove (cache_tree, keys[i], (void *) &key,
335 (void *) &value) != 0)
336 {
337 WARNING ("network plugin: cache_flush: c_avl_remove"
338 " (%s) failed.", keys[i]);
339 continue;
340 }
342 sfree (key);
343 sfree (value);
344 }
346 sfree (keys);
348 DEBUG ("network plugin: cache_flush: Removed %i %s",
349 keys_num, (keys_num == 1) ? "entry" : "entries");
350 cache_flush_last = curtime;
351 return (0);
352 } /* int cache_flush */
354 static int cache_check (const value_list_t *vl)
355 {
356 char key[1024];
357 time_t *value = NULL;
358 int retval = -1;
360 if (cache_tree == NULL)
361 return (-1);
363 if (format_name (key, sizeof (key), vl->host, vl->plugin,
364 vl->plugin_instance, vl->type, vl->type_instance))
365 return (-1);
367 pthread_mutex_lock (&cache_lock);
369 if (c_avl_get (cache_tree, key, (void *) &value) == 0)
370 {
371 if (*value < vl->time)
372 {
373 *value = vl->time;
374 retval = 0;
375 }
376 else
377 {
378 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
379 (int) *value, (int) vl->time);
380 retval = 1;
381 }
382 }
383 else
384 {
385 char *key_copy = strdup (key);
386 value = malloc (sizeof (time_t));
387 if ((key_copy != NULL) && (value != NULL))
388 {
389 *value = vl->time;
390 c_avl_insert (cache_tree, key_copy, value);
391 retval = 0;
392 }
393 else
394 {
395 sfree (key_copy);
396 sfree (value);
397 }
398 }
400 if ((time (NULL) - cache_flush_last) > cache_flush_interval)
401 cache_flush ();
403 pthread_mutex_unlock (&cache_lock);
405 return (retval);
406 } /* int cache_check */
408 #if HAVE_LIBGCRYPT
409 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
410 const void *iv, size_t iv_size, const char *username)
411 {
412 gcry_error_t err;
413 gcry_cipher_hd_t *cyper_ptr;
414 unsigned char password_hash[32];
416 if (se->type == SOCKENT_TYPE_CLIENT)
417 {
418 cyper_ptr = &se->data.client.cypher;
419 memcpy (password_hash, se->data.client.password_hash,
420 sizeof (password_hash));
421 }
422 else
423 {
424 char *secret;
426 cyper_ptr = &se->data.server.cypher;
428 if (username == NULL)
429 return (NULL);
431 secret = fbh_get (se->data.server.userdb, username);
432 if (secret == NULL)
433 return (NULL);
435 gcry_md_hash_buffer (GCRY_MD_SHA256,
436 password_hash,
437 secret, strlen (secret));
439 sfree (secret);
440 }
442 if (*cyper_ptr == NULL)
443 {
444 err = gcry_cipher_open (cyper_ptr,
445 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0);
446 if (err != 0)
447 {
448 ERROR ("network plugin: gcry_cipher_open returned: %s",
449 gcry_strerror (err));
450 *cyper_ptr = NULL;
451 return (NULL);
452 }
453 }
454 else
455 {
456 gcry_cipher_reset (*cyper_ptr);
457 }
458 assert (*cyper_ptr != NULL);
460 err = gcry_cipher_setkey (*cyper_ptr,
461 password_hash, sizeof (password_hash));
462 if (err != 0)
463 {
464 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
465 gcry_strerror (err));
466 gcry_cipher_close (*cyper_ptr);
467 *cyper_ptr = NULL;
468 return (NULL);
469 }
471 err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size);
472 if (err != 0)
473 {
474 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
475 gcry_strerror (err));
476 gcry_cipher_close (*cyper_ptr);
477 *cyper_ptr = NULL;
478 return (NULL);
479 }
481 return (*cyper_ptr);
482 } /* }}} int network_get_aes256_cypher */
483 #endif /* HAVE_LIBGCRYPT */
485 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
486 const data_set_t *ds, const value_list_t *vl)
487 {
488 char *packet_ptr;
489 int packet_len;
490 int num_values;
492 part_header_t pkg_ph;
493 uint16_t pkg_num_values;
494 uint8_t *pkg_values_types;
495 value_t *pkg_values;
497 int offset;
498 int i;
500 num_values = vl->values_len;
501 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
502 + (num_values * sizeof (uint8_t))
503 + (num_values * sizeof (value_t));
505 if (*ret_buffer_len < packet_len)
506 return (-1);
508 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
509 if (pkg_values_types == NULL)
510 {
511 ERROR ("network plugin: write_part_values: malloc failed.");
512 return (-1);
513 }
515 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
516 if (pkg_values == NULL)
517 {
518 free (pkg_values_types);
519 ERROR ("network plugin: write_part_values: malloc failed.");
520 return (-1);
521 }
523 pkg_ph.type = htons (TYPE_VALUES);
524 pkg_ph.length = htons (packet_len);
526 pkg_num_values = htons ((uint16_t) vl->values_len);
528 for (i = 0; i < num_values; i++)
529 {
530 pkg_values_types[i] = (uint8_t) ds->ds[i].type;
531 switch (ds->ds[i].type)
532 {
533 case DS_TYPE_COUNTER:
534 pkg_values[i].counter = htonll (vl->values[i].counter);
535 break;
537 case DS_TYPE_GAUGE:
538 pkg_values[i].gauge = htond (vl->values[i].gauge);
539 break;
541 case DS_TYPE_DERIVE:
542 pkg_values[i].derive = htonll (vl->values[i].derive);
543 break;
545 case DS_TYPE_ABSOLUTE:
546 pkg_values[i].absolute = htonll (vl->values[i].absolute);
547 break;
549 default:
550 free (pkg_values_types);
551 free (pkg_values);
552 ERROR ("network plugin: write_part_values: "
553 "Unknown data source type: %i",
554 ds->ds[i].type);
555 return (-1);
556 } /* switch (ds->ds[i].type) */
557 } /* for (num_values) */
559 /*
560 * Use `memcpy' to write everything to the buffer, because the pointer
561 * may be unaligned and some architectures, such as SPARC, can't handle
562 * that.
563 */
564 packet_ptr = *ret_buffer;
565 offset = 0;
566 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
567 offset += sizeof (pkg_ph);
568 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
569 offset += sizeof (pkg_num_values);
570 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
571 offset += num_values * sizeof (uint8_t);
572 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
573 offset += num_values * sizeof (value_t);
575 assert (offset == packet_len);
577 *ret_buffer = packet_ptr + packet_len;
578 *ret_buffer_len -= packet_len;
580 free (pkg_values_types);
581 free (pkg_values);
583 return (0);
584 } /* int write_part_values */
586 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
587 int type, uint64_t value)
588 {
589 char *packet_ptr;
590 int packet_len;
592 part_header_t pkg_head;
593 uint64_t pkg_value;
595 int offset;
597 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
599 if (*ret_buffer_len < packet_len)
600 return (-1);
602 pkg_head.type = htons (type);
603 pkg_head.length = htons (packet_len);
604 pkg_value = htonll (value);
606 packet_ptr = *ret_buffer;
607 offset = 0;
608 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
609 offset += sizeof (pkg_head);
610 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
611 offset += sizeof (pkg_value);
613 assert (offset == packet_len);
615 *ret_buffer = packet_ptr + packet_len;
616 *ret_buffer_len -= packet_len;
618 return (0);
619 } /* int write_part_number */
621 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
622 int type, const char *str, int str_len)
623 {
624 char *buffer;
625 int buffer_len;
627 uint16_t pkg_type;
628 uint16_t pkg_length;
630 int offset;
632 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
633 if (*ret_buffer_len < buffer_len)
634 return (-1);
636 pkg_type = htons (type);
637 pkg_length = htons (buffer_len);
639 buffer = *ret_buffer;
640 offset = 0;
641 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
642 offset += sizeof (pkg_type);
643 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
644 offset += sizeof (pkg_length);
645 memcpy (buffer + offset, str, str_len);
646 offset += str_len;
647 memset (buffer + offset, '\0', 1);
648 offset += 1;
650 assert (offset == buffer_len);
652 *ret_buffer = buffer + buffer_len;
653 *ret_buffer_len -= buffer_len;
655 return (0);
656 } /* int write_part_string */
658 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
659 value_t **ret_values, int *ret_num_values)
660 {
661 char *buffer = *ret_buffer;
662 size_t buffer_len = *ret_buffer_len;
664 uint16_t tmp16;
665 size_t exp_size;
666 int i;
668 uint16_t pkg_length;
669 uint16_t pkg_type;
670 uint16_t pkg_numval;
672 uint8_t *pkg_types;
673 value_t *pkg_values;
675 if (buffer_len < 15)
676 {
677 NOTICE ("network plugin: packet is too short: "
678 "buffer_len = %zu", buffer_len);
679 return (-1);
680 }
682 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
683 buffer += sizeof (tmp16);
684 pkg_type = ntohs (tmp16);
686 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
687 buffer += sizeof (tmp16);
688 pkg_length = ntohs (tmp16);
690 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
691 buffer += sizeof (tmp16);
692 pkg_numval = ntohs (tmp16);
694 assert (pkg_type == TYPE_VALUES);
696 exp_size = 3 * sizeof (uint16_t)
697 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
698 if ((buffer_len < 0) || (buffer_len < exp_size))
699 {
700 WARNING ("network plugin: parse_part_values: "
701 "Packet too short: "
702 "Chunk of size %zu expected, "
703 "but buffer has only %zu bytes left.",
704 exp_size, buffer_len);
705 return (-1);
706 }
708 if (pkg_length != exp_size)
709 {
710 WARNING ("network plugin: parse_part_values: "
711 "Length and number of values "
712 "in the packet don't match.");
713 return (-1);
714 }
716 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
717 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
718 if ((pkg_types == NULL) || (pkg_values == NULL))
719 {
720 sfree (pkg_types);
721 sfree (pkg_values);
722 ERROR ("network plugin: parse_part_values: malloc failed.");
723 return (-1);
724 }
726 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
727 buffer += pkg_numval * sizeof (uint8_t);
728 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
729 buffer += pkg_numval * sizeof (value_t);
731 for (i = 0; i < pkg_numval; i++)
732 {
733 switch (pkg_types[i])
734 {
735 case DS_TYPE_COUNTER:
736 pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter);
737 break;
739 case DS_TYPE_GAUGE:
740 pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge);
741 break;
743 case DS_TYPE_DERIVE:
744 pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive);
745 break;
747 case DS_TYPE_ABSOLUTE:
748 pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute);
749 break;
751 default:
752 sfree (pkg_types);
753 sfree (pkg_values);
754 NOTICE ("network plugin: parse_part_values: "
755 "Don't know how to handle data source type %"PRIu8,
756 pkg_types[i]);
757 return (-1);
758 } /* switch (pkg_types[i]) */
759 }
761 *ret_buffer = buffer;
762 *ret_buffer_len = buffer_len - pkg_length;
763 *ret_num_values = pkg_numval;
764 *ret_values = pkg_values;
766 sfree (pkg_types);
768 return (0);
769 } /* int parse_part_values */
771 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
772 uint64_t *value)
773 {
774 char *buffer = *ret_buffer;
775 size_t buffer_len = *ret_buffer_len;
777 uint16_t tmp16;
778 uint64_t tmp64;
779 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
781 uint16_t pkg_length;
782 uint16_t pkg_type;
784 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
785 {
786 WARNING ("network plugin: parse_part_number: "
787 "Packet too short: "
788 "Chunk of size %zu expected, "
789 "but buffer has only %zu bytes left.",
790 exp_size, buffer_len);
791 return (-1);
792 }
794 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
795 buffer += sizeof (tmp16);
796 pkg_type = ntohs (tmp16);
798 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
799 buffer += sizeof (tmp16);
800 pkg_length = ntohs (tmp16);
802 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
803 buffer += sizeof (tmp64);
804 *value = ntohll (tmp64);
806 *ret_buffer = buffer;
807 *ret_buffer_len = buffer_len - pkg_length;
809 return (0);
810 } /* int parse_part_number */
812 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
813 char *output, int output_len)
814 {
815 char *buffer = *ret_buffer;
816 size_t buffer_len = *ret_buffer_len;
818 uint16_t tmp16;
819 size_t header_size = 2 * sizeof (uint16_t);
821 uint16_t pkg_length;
822 uint16_t pkg_type;
824 if ((buffer_len < 0) || (buffer_len < header_size))
825 {
826 WARNING ("network plugin: parse_part_string: "
827 "Packet too short: "
828 "Chunk of at least size %zu expected, "
829 "but buffer has only %zu bytes left.",
830 header_size, buffer_len);
831 return (-1);
832 }
834 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
835 buffer += sizeof (tmp16);
836 pkg_type = ntohs (tmp16);
838 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
839 buffer += sizeof (tmp16);
840 pkg_length = ntohs (tmp16);
842 /* Check that packet fits in the input buffer */
843 if (pkg_length > buffer_len)
844 {
845 WARNING ("network plugin: parse_part_string: "
846 "Packet too big: "
847 "Chunk of size %"PRIu16" received, "
848 "but buffer has only %zu bytes left.",
849 pkg_length, buffer_len);
850 return (-1);
851 }
853 /* Check that pkg_length is in the valid range */
854 if (pkg_length <= header_size)
855 {
856 WARNING ("network plugin: parse_part_string: "
857 "Packet too short: "
858 "Header claims this packet is only %hu "
859 "bytes long.", pkg_length);
860 return (-1);
861 }
863 /* Check that the package data fits into the output buffer.
864 * The previous if-statement ensures that:
865 * `pkg_length > header_size' */
866 if ((output_len < 0)
867 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
868 {
869 WARNING ("network plugin: parse_part_string: "
870 "Output buffer too small.");
871 return (-1);
872 }
874 /* All sanity checks successfull, let's copy the data over */
875 output_len = pkg_length - header_size;
876 memcpy ((void *) output, (void *) buffer, output_len);
877 buffer += output_len;
879 /* For some very weird reason '\0' doesn't do the trick on SPARC in
880 * this statement. */
881 if (output[output_len - 1] != 0)
882 {
883 WARNING ("network plugin: parse_part_string: "
884 "Received string does not end "
885 "with a NULL-byte.");
886 return (-1);
887 }
889 *ret_buffer = buffer;
890 *ret_buffer_len = buffer_len - pkg_length;
892 return (0);
893 } /* int parse_part_string */
895 /* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call
896 * parse_packet and vice versa. */
897 #define PP_SIGNED 0x01
898 #define PP_ENCRYPTED 0x02
899 static int parse_packet (sockent_t *se,
900 void *buffer, size_t buffer_size, int flags);
902 #define BUFFER_READ(p,s) do { \
903 memcpy ((p), buffer + buffer_offset, (s)); \
904 buffer_offset += (s); \
905 } while (0)
907 #if HAVE_LIBGCRYPT
908 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
909 void **ret_buffer, size_t *ret_buffer_len, int flags)
910 {
911 char *buffer;
912 size_t buffer_len;
913 size_t buffer_offset;
915 size_t username_len;
916 char *secret;
918 part_signature_sha256_t pss;
919 uint16_t pss_head_length;
920 char hash[sizeof (pss.hash)];
922 gcry_md_hd_t hd;
923 gcry_error_t err;
924 unsigned char *hash_ptr;
926 buffer = *ret_buffer;
927 buffer_len = *ret_buffer_len;
928 buffer_offset = 0;
930 if (se->data.server.userdb == NULL)
931 {
932 NOTICE ("network plugin: Received signed network packet but can't verify "
933 "it because no user DB has been configured. Will accept it.");
934 return (0);
935 }
937 /* Check if the buffer has enough data for this structure. */
938 if (buffer_len <= PART_SIGNATURE_SHA256_SIZE)
939 return (-ENOMEM);
941 /* Read type and length header */
942 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
943 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
944 pss_head_length = ntohs (pss.head.length);
946 /* Check if the `pss_head_length' is within bounds. */
947 if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE)
948 || (pss_head_length > buffer_len))
949 {
950 ERROR ("network plugin: HMAC-SHA-256 with invalid length received.");
951 return (-1);
952 }
954 /* Copy the hash. */
955 BUFFER_READ (pss.hash, sizeof (pss.hash));
957 /* Calculate username length (without null byte) and allocate memory */
958 username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE;
959 pss.username = malloc (username_len + 1);
960 if (pss.username == NULL)
961 return (-ENOMEM);
963 /* Read the username */
964 BUFFER_READ (pss.username, username_len);
965 pss.username[username_len] = 0;
967 assert (buffer_offset == pss_head_length);
969 /* Query the password */
970 secret = fbh_get (se->data.server.userdb, pss.username);
971 if (secret == NULL)
972 {
973 ERROR ("network plugin: Unknown user: %s", pss.username);
974 sfree (pss.username);
975 return (-ENOENT);
976 }
978 /* Create a hash device and check the HMAC */
979 hd = NULL;
980 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
981 if (err != 0)
982 {
983 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
984 gcry_strerror (err));
985 sfree (secret);
986 sfree (pss.username);
987 return (-1);
988 }
990 err = gcry_md_setkey (hd, secret, strlen (secret));
991 if (err != 0)
992 {
993 ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err));
994 gcry_md_close (hd);
995 return (-1);
996 }
998 gcry_md_write (hd,
999 buffer + PART_SIGNATURE_SHA256_SIZE,
1000 buffer_len - PART_SIGNATURE_SHA256_SIZE);
1001 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
1002 if (hash_ptr == NULL)
1003 {
1004 ERROR ("network plugin: gcry_md_read failed.");
1005 gcry_md_close (hd);
1006 sfree (secret);
1007 sfree (pss.username);
1008 return (-1);
1009 }
1010 memcpy (hash, hash_ptr, sizeof (hash));
1012 /* Clean up */
1013 gcry_md_close (hd);
1014 hd = NULL;
1016 sfree (secret);
1017 sfree (pss.username);
1019 if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0)
1020 {
1021 WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: "
1022 "Hash mismatch.");
1023 }
1024 else
1025 {
1026 parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset,
1027 flags | PP_SIGNED);
1028 }
1030 *ret_buffer = buffer + buffer_len;
1031 *ret_buffer_len = 0;
1033 return (0);
1034 } /* }}} int parse_part_sign_sha256 */
1035 /* #endif HAVE_LIBGCRYPT */
1037 #else /* if !HAVE_LIBGCRYPT */
1038 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1039 void **ret_buffer, size_t *ret_buffer_size, int flags)
1040 {
1041 static int warning_has_been_printed = 0;
1043 char *buffer;
1044 size_t buffer_size;
1045 size_t buffer_offset;
1046 uint16_t part_len;
1048 part_signature_sha256_t pss;
1050 buffer = *ret_buffer;
1051 buffer_size = *ret_buffer_size;
1052 buffer_offset = 0;
1054 if (buffer_size <= PART_SIGNATURE_SHA256_SIZE)
1055 return (-ENOMEM);
1057 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1058 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1059 part_len = ntohs (pss.head.length);
1061 if ((part_len <= PART_SIGNATURE_SHA256_SIZE)
1062 || (part_len > buffer_size))
1063 return (-EINVAL);
1065 if (warning_has_been_printed == 0)
1066 {
1067 WARNING ("network plugin: Received signed packet, but the network "
1068 "plugin was not linked with libgcrypt, so I cannot "
1069 "verify the signature. The packet will be accepted.");
1070 warning_has_been_printed = 1;
1071 }
1073 parse_packet (se, buffer + part_len, buffer_size - part_len, flags);
1075 *ret_buffer = buffer + buffer_size;
1076 *ret_buffer_size = 0;
1078 return (0);
1079 } /* }}} int parse_part_sign_sha256 */
1080 #endif /* !HAVE_LIBGCRYPT */
1082 #if HAVE_LIBGCRYPT
1083 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1084 void **ret_buffer, size_t *ret_buffer_len,
1085 int flags)
1086 {
1087 char *buffer = *ret_buffer;
1088 size_t buffer_len = *ret_buffer_len;
1089 size_t payload_len;
1090 size_t part_size;
1091 size_t buffer_offset;
1092 uint16_t username_len;
1093 part_encryption_aes256_t pea;
1094 unsigned char hash[sizeof (pea.hash)];
1096 gcry_cipher_hd_t cypher;
1097 gcry_error_t err;
1099 /* Make sure at least the header if available. */
1100 if (buffer_len <= PART_ENCRYPTION_AES256_SIZE)
1101 {
1102 NOTICE ("network plugin: parse_part_encr_aes256: "
1103 "Discarding short packet.");
1104 return (-1);
1105 }
1107 buffer_offset = 0;
1109 /* Copy the unencrypted information into `pea'. */
1110 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
1111 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
1113 /* Check the `part size'. */
1114 part_size = ntohs (pea.head.length);
1115 if ((part_size <= PART_ENCRYPTION_AES256_SIZE)
1116 || (part_size > buffer_len))
1117 {
1118 NOTICE ("network plugin: parse_part_encr_aes256: "
1119 "Discarding part with invalid size.");
1120 return (-1);
1121 }
1123 /* Read the username */
1124 BUFFER_READ (&username_len, sizeof (username_len));
1125 username_len = ntohs (username_len);
1127 if ((username_len <= 0)
1128 || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1))))
1129 {
1130 NOTICE ("network plugin: parse_part_encr_aes256: "
1131 "Discarding part with invalid username length.");
1132 return (-1);
1133 }
1135 assert (username_len > 0);
1136 pea.username = malloc (username_len + 1);
1137 if (pea.username == NULL)
1138 return (-ENOMEM);
1139 BUFFER_READ (pea.username, username_len);
1140 pea.username[username_len] = 0;
1142 /* Last but not least, the initialization vector */
1143 BUFFER_READ (pea.iv, sizeof (pea.iv));
1145 /* Make sure we are at the right position */
1146 assert (buffer_offset == (username_len +
1147 PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash)));
1149 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
1150 pea.username);
1151 if (cypher == NULL)
1152 return (-1);
1154 payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len);
1155 assert (payload_len > 0);
1157 /* Decrypt the packet in-place */
1158 err = gcry_cipher_decrypt (cypher,
1159 buffer + buffer_offset,
1160 part_size - buffer_offset,
1161 /* in = */ NULL, /* in len = */ 0);
1162 if (err != 0)
1163 {
1164 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
1165 gcry_strerror (err));
1166 return (-1);
1167 }
1169 /* Read the hash */
1170 BUFFER_READ (pea.hash, sizeof (pea.hash));
1172 /* Make sure we're at the right position - again */
1173 assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE));
1174 assert (buffer_offset == (part_size - payload_len));
1176 /* Check hash sum */
1177 memset (hash, 0, sizeof (hash));
1178 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
1179 buffer + buffer_offset, payload_len);
1180 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
1181 {
1182 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
1183 return (-1);
1184 }
1186 parse_packet (se, buffer + buffer_offset, payload_len,
1187 flags | PP_ENCRYPTED);
1189 /* Update return values */
1190 *ret_buffer = buffer + part_size;
1191 *ret_buffer_len = buffer_len - part_size;
1193 return (0);
1194 } /* }}} int parse_part_encr_aes256 */
1195 /* #endif HAVE_LIBGCRYPT */
1197 #else /* if !HAVE_LIBGCRYPT */
1198 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1199 void **ret_buffer, size_t *ret_buffer_size, int flags)
1200 {
1201 static int warning_has_been_printed = 0;
1203 char *buffer;
1204 size_t buffer_size;
1205 size_t buffer_offset;
1207 part_header_t ph;
1208 size_t ph_length;
1210 buffer = *ret_buffer;
1211 buffer_size = *ret_buffer_size;
1212 buffer_offset = 0;
1214 /* parse_packet assures this minimum size. */
1215 assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length)));
1217 BUFFER_READ (&ph.type, sizeof (ph.type));
1218 BUFFER_READ (&ph.length, sizeof (ph.length));
1219 ph_length = ntohs (ph.length);
1221 if ((ph_length <= PART_ENCRYPTION_AES256_SIZE)
1222 || (ph_length > buffer_size))
1223 {
1224 ERROR ("network plugin: AES-256 encrypted part "
1225 "with invalid length received.");
1226 return (-1);
1227 }
1229 if (warning_has_been_printed == 0)
1230 {
1231 WARNING ("network plugin: Received encrypted packet, but the network "
1232 "plugin was not linked with libgcrypt, so I cannot "
1233 "decrypt it. The part will be discarded.");
1234 warning_has_been_printed = 1;
1235 }
1237 *ret_buffer += ph_length;
1238 *ret_buffer_size -= ph_length;
1240 return (0);
1241 } /* }}} int parse_part_encr_aes256 */
1242 #endif /* !HAVE_LIBGCRYPT */
1244 #undef BUFFER_READ
1246 static int parse_packet (sockent_t *se, /* {{{ */
1247 void *buffer, size_t buffer_size, int flags)
1248 {
1249 int status;
1251 value_list_t vl = VALUE_LIST_INIT;
1252 notification_t n;
1254 #if HAVE_LIBGCRYPT
1255 int packet_was_signed = (flags & PP_SIGNED);
1256 int packet_was_encrypted = (flags & PP_ENCRYPTED);
1257 int printed_ignore_warning = 0;
1258 #endif /* HAVE_LIBGCRYPT */
1261 memset (&vl, '\0', sizeof (vl));
1262 memset (&n, '\0', sizeof (n));
1263 status = 0;
1265 while ((status == 0) && (0 < buffer_size)
1266 && ((unsigned int) buffer_size > sizeof (part_header_t)))
1267 {
1268 uint16_t pkg_length;
1269 uint16_t pkg_type;
1271 memcpy ((void *) &pkg_type,
1272 (void *) buffer,
1273 sizeof (pkg_type));
1274 memcpy ((void *) &pkg_length,
1275 (void *) (buffer + sizeof (pkg_type)),
1276 sizeof (pkg_length));
1278 pkg_length = ntohs (pkg_length);
1279 pkg_type = ntohs (pkg_type);
1281 if (pkg_length > buffer_size)
1282 break;
1283 /* Ensure that this loop terminates eventually */
1284 if (pkg_length < (2 * sizeof (uint16_t)))
1285 break;
1287 if (pkg_type == TYPE_ENCR_AES256)
1288 {
1289 status = parse_part_encr_aes256 (se,
1290 &buffer, &buffer_size, flags);
1291 if (status != 0)
1292 {
1293 ERROR ("network plugin: Decrypting AES256 "
1294 "part failed "
1295 "with status %i.", status);
1296 break;
1297 }
1298 }
1299 #if HAVE_LIBGCRYPT
1300 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
1301 && (packet_was_encrypted == 0))
1302 {
1303 if (printed_ignore_warning == 0)
1304 {
1305 INFO ("network plugin: Unencrypted packet or "
1306 "part has been ignored.");
1307 printed_ignore_warning = 1;
1308 }
1309 buffer = ((char *) buffer) + pkg_length;
1310 continue;
1311 }
1312 #endif /* HAVE_LIBGCRYPT */
1313 else if (pkg_type == TYPE_SIGN_SHA256)
1314 {
1315 status = parse_part_sign_sha256 (se,
1316 &buffer, &buffer_size, flags);
1317 if (status != 0)
1318 {
1319 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1320 "signature failed "
1321 "with status %i.", status);
1322 break;
1323 }
1324 }
1325 #if HAVE_LIBGCRYPT
1326 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
1327 && (packet_was_encrypted == 0)
1328 && (packet_was_signed == 0))
1329 {
1330 if (printed_ignore_warning == 0)
1331 {
1332 INFO ("network plugin: Unsigned packet or "
1333 "part has been ignored.");
1334 printed_ignore_warning = 1;
1335 }
1336 buffer = ((char *) buffer) + pkg_length;
1337 continue;
1338 }
1339 #endif /* HAVE_LIBGCRYPT */
1340 else if (pkg_type == TYPE_VALUES)
1341 {
1342 status = parse_part_values (&buffer, &buffer_size,
1343 &vl.values, &vl.values_len);
1345 if (status != 0)
1346 break;
1348 if ((vl.time > 0)
1349 && (strlen (vl.host) > 0)
1350 && (strlen (vl.plugin) > 0)
1351 && (strlen (vl.type) > 0)
1352 && (cache_check (&vl) == 0))
1353 {
1354 plugin_dispatch_values (&vl);
1355 }
1356 else
1357 {
1358 DEBUG ("network plugin: parse_packet:"
1359 " NOT dispatching values");
1360 }
1362 sfree (vl.values);
1363 }
1364 else if (pkg_type == TYPE_TIME)
1365 {
1366 uint64_t tmp = 0;
1367 status = parse_part_number (&buffer, &buffer_size,
1368 &tmp);
1369 if (status == 0)
1370 {
1371 vl.time = (time_t) tmp;
1372 n.time = (time_t) tmp;
1373 }
1374 }
1375 else if (pkg_type == TYPE_INTERVAL)
1376 {
1377 uint64_t tmp = 0;
1378 status = parse_part_number (&buffer, &buffer_size,
1379 &tmp);
1380 if (status == 0)
1381 vl.interval = (int) tmp;
1382 }
1383 else if (pkg_type == TYPE_HOST)
1384 {
1385 status = parse_part_string (&buffer, &buffer_size,
1386 vl.host, sizeof (vl.host));
1387 if (status == 0)
1388 sstrncpy (n.host, vl.host, sizeof (n.host));
1389 }
1390 else if (pkg_type == TYPE_PLUGIN)
1391 {
1392 status = parse_part_string (&buffer, &buffer_size,
1393 vl.plugin, sizeof (vl.plugin));
1394 if (status == 0)
1395 sstrncpy (n.plugin, vl.plugin,
1396 sizeof (n.plugin));
1397 }
1398 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1399 {
1400 status = parse_part_string (&buffer, &buffer_size,
1401 vl.plugin_instance,
1402 sizeof (vl.plugin_instance));
1403 if (status == 0)
1404 sstrncpy (n.plugin_instance,
1405 vl.plugin_instance,
1406 sizeof (n.plugin_instance));
1407 }
1408 else if (pkg_type == TYPE_TYPE)
1409 {
1410 status = parse_part_string (&buffer, &buffer_size,
1411 vl.type, sizeof (vl.type));
1412 if (status == 0)
1413 sstrncpy (n.type, vl.type, sizeof (n.type));
1414 }
1415 else if (pkg_type == TYPE_TYPE_INSTANCE)
1416 {
1417 status = parse_part_string (&buffer, &buffer_size,
1418 vl.type_instance,
1419 sizeof (vl.type_instance));
1420 if (status == 0)
1421 sstrncpy (n.type_instance, vl.type_instance,
1422 sizeof (n.type_instance));
1423 }
1424 else if (pkg_type == TYPE_MESSAGE)
1425 {
1426 status = parse_part_string (&buffer, &buffer_size,
1427 n.message, sizeof (n.message));
1429 if (status != 0)
1430 {
1431 /* do nothing */
1432 }
1433 else if ((n.severity != NOTIF_FAILURE)
1434 && (n.severity != NOTIF_WARNING)
1435 && (n.severity != NOTIF_OKAY))
1436 {
1437 INFO ("network plugin: "
1438 "Ignoring notification with "
1439 "unknown severity %i.",
1440 n.severity);
1441 }
1442 else if (n.time <= 0)
1443 {
1444 INFO ("network plugin: "
1445 "Ignoring notification with "
1446 "time == 0.");
1447 }
1448 else if (strlen (n.message) <= 0)
1449 {
1450 INFO ("network plugin: "
1451 "Ignoring notification with "
1452 "an empty message.");
1453 }
1454 else
1455 {
1456 plugin_dispatch_notification (&n);
1457 }
1458 }
1459 else if (pkg_type == TYPE_SEVERITY)
1460 {
1461 uint64_t tmp = 0;
1462 status = parse_part_number (&buffer, &buffer_size,
1463 &tmp);
1464 if (status == 0)
1465 n.severity = (int) tmp;
1466 }
1467 else
1468 {
1469 DEBUG ("network plugin: parse_packet: Unknown part"
1470 " type: 0x%04hx", pkg_type);
1471 buffer = ((char *) buffer) + pkg_length;
1472 }
1473 } /* while (buffer_size > sizeof (part_header_t)) */
1475 return (status);
1476 } /* }}} int parse_packet */
1478 static void free_sockent_client (struct sockent_client *sec) /* {{{ */
1479 {
1480 if (sec->fd >= 0)
1481 {
1482 close (sec->fd);
1483 sec->fd = -1;
1484 }
1485 sfree (sec->addr);
1486 #if HAVE_LIBGCRYPT
1487 sfree (sec->username);
1488 sfree (sec->password);
1489 if (sec->cypher != NULL)
1490 gcry_cipher_close (sec->cypher);
1491 #endif
1492 } /* }}} void free_sockent_client */
1494 static void free_sockent_server (struct sockent_server *ses) /* {{{ */
1495 {
1496 size_t i;
1498 for (i = 0; i < ses->fd_num; i++)
1499 {
1500 if (ses->fd[i] >= 0)
1501 {
1502 close (ses->fd[i]);
1503 ses->fd[i] = -1;
1504 }
1505 }
1507 sfree (ses->fd);
1508 #if HAVE_LIBGCRYPT
1509 sfree (ses->auth_file);
1510 fbh_destroy (ses->userdb);
1511 if (ses->cypher != NULL)
1512 gcry_cipher_close (ses->cypher);
1513 #endif
1514 } /* }}} void free_sockent_server */
1516 static void sockent_destroy (sockent_t *se) /* {{{ */
1517 {
1518 sockent_t *next;
1520 DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se);
1522 while (se != NULL)
1523 {
1524 next = se->next;
1526 sfree (se->node);
1527 sfree (se->service);
1529 if (se->type == SOCKENT_TYPE_CLIENT)
1530 free_sockent_client (&se->data.client);
1531 else
1532 free_sockent_server (&se->data.server);
1534 sfree (se);
1535 se = next;
1536 }
1537 } /* }}} void sockent_destroy */
1539 /*
1540 * int network_set_ttl
1541 *
1542 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1543 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1544 *
1545 * The `struct addrinfo' is used to destinguish between unicast and multicast
1546 * sockets.
1547 */
1548 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1549 {
1550 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1551 network_config_ttl);
1553 assert (se->type == SOCKENT_TYPE_CLIENT);
1555 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1556 return (-1);
1558 if (ai->ai_family == AF_INET)
1559 {
1560 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1561 int optname;
1563 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1564 optname = IP_MULTICAST_TTL;
1565 else
1566 optname = IP_TTL;
1568 if (setsockopt (se->data.client.fd, IPPROTO_IP, optname,
1569 &network_config_ttl,
1570 sizeof (network_config_ttl)) == -1)
1571 {
1572 char errbuf[1024];
1573 ERROR ("setsockopt: %s",
1574 sstrerror (errno, errbuf, sizeof (errbuf)));
1575 return (-1);
1576 }
1577 }
1578 else if (ai->ai_family == AF_INET6)
1579 {
1580 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1581 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1582 int optname;
1584 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1585 optname = IPV6_MULTICAST_HOPS;
1586 else
1587 optname = IPV6_UNICAST_HOPS;
1589 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname,
1590 &network_config_ttl,
1591 sizeof (network_config_ttl)) == -1)
1592 {
1593 char errbuf[1024];
1594 ERROR ("setsockopt: %s",
1595 sstrerror (errno, errbuf,
1596 sizeof (errbuf)));
1597 return (-1);
1598 }
1599 }
1601 return (0);
1602 } /* int network_set_ttl */
1604 static int network_bind_socket (int fd, const struct addrinfo *ai)
1605 {
1606 int loop = 0;
1607 int yes = 1;
1609 /* allow multiple sockets to use the same PORT number */
1610 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
1611 &yes, sizeof(yes)) == -1) {
1612 char errbuf[1024];
1613 ERROR ("setsockopt: %s",
1614 sstrerror (errno, errbuf, sizeof (errbuf)));
1615 return (-1);
1616 }
1618 DEBUG ("fd = %i; calling `bind'", fd);
1620 if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1)
1621 {
1622 char errbuf[1024];
1623 ERROR ("bind: %s",
1624 sstrerror (errno, errbuf, sizeof (errbuf)));
1625 return (-1);
1626 }
1628 if (ai->ai_family == AF_INET)
1629 {
1630 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1631 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1632 {
1633 struct ip_mreq mreq;
1635 DEBUG ("fd = %i; IPv4 multicast address found", fd);
1637 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1638 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
1640 if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1641 &loop, sizeof (loop)) == -1)
1642 {
1643 char errbuf[1024];
1644 ERROR ("setsockopt: %s",
1645 sstrerror (errno, errbuf,
1646 sizeof (errbuf)));
1647 return (-1);
1648 }
1650 if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1651 &mreq, sizeof (mreq)) == -1)
1652 {
1653 char errbuf[1024];
1654 ERROR ("setsockopt: %s",
1655 sstrerror (errno, errbuf,
1656 sizeof (errbuf)));
1657 return (-1);
1658 }
1659 }
1660 }
1661 else if (ai->ai_family == AF_INET6)
1662 {
1663 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1664 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1665 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1666 {
1667 struct ipv6_mreq mreq;
1669 DEBUG ("fd = %i; IPv6 multicast address found", fd);
1671 memcpy (&mreq.ipv6mr_multiaddr,
1672 &addr->sin6_addr,
1673 sizeof (addr->sin6_addr));
1675 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1676 * ipv6mr_interface may be set to zeroes to
1677 * choose the default multicast interface or to
1678 * the index of a particular multicast-capable
1679 * interface if the host is multihomed.
1680 * Membership is associ-associated with a
1681 * single interface; programs running on
1682 * multihomed hosts may need to join the same
1683 * group on more than one interface.*/
1684 mreq.ipv6mr_interface = 0;
1686 if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1687 &loop, sizeof (loop)) == -1)
1688 {
1689 char errbuf[1024];
1690 ERROR ("setsockopt: %s",
1691 sstrerror (errno, errbuf,
1692 sizeof (errbuf)));
1693 return (-1);
1694 }
1696 if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1697 &mreq, sizeof (mreq)) == -1)
1698 {
1699 char errbuf[1024];
1700 ERROR ("setsockopt: %s",
1701 sstrerror (errno, errbuf,
1702 sizeof (errbuf)));
1703 return (-1);
1704 }
1705 }
1706 }
1708 return (0);
1709 } /* int network_bind_socket */
1711 /* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT'
1712 * or `SOCKENT_TYPE_SERVER' */
1713 static int sockent_init (sockent_t *se, int type) /* {{{ */
1714 {
1715 if (se == NULL)
1716 return (-1);
1718 memset (se, 0, sizeof (*se));
1720 se->type = SOCKENT_TYPE_CLIENT;
1721 se->node = NULL;
1722 se->service = NULL;
1723 se->next = NULL;
1725 if (type == SOCKENT_TYPE_SERVER)
1726 {
1727 se->type = SOCKENT_TYPE_SERVER;
1728 se->data.server.fd = NULL;
1729 #if HAVE_LIBGCRYPT
1730 se->data.server.security_level = SECURITY_LEVEL_NONE;
1731 se->data.server.auth_file = NULL;
1732 se->data.server.userdb = NULL;
1733 se->data.server.cypher = NULL;
1734 #endif
1735 }
1736 else
1737 {
1738 se->data.client.fd = -1;
1739 se->data.client.addr = NULL;
1740 #if HAVE_LIBGCRYPT
1741 se->data.client.security_level = SECURITY_LEVEL_NONE;
1742 se->data.client.username = NULL;
1743 se->data.client.password = NULL;
1744 se->data.client.cypher = NULL;
1745 #endif
1746 }
1748 return (0);
1749 } /* }}} int sockent_init */
1751 /* Open the file descriptors for a initialized sockent structure. */
1752 static int sockent_open (sockent_t *se) /* {{{ */
1753 {
1754 struct addrinfo ai_hints;
1755 struct addrinfo *ai_list, *ai_ptr;
1756 int ai_return;
1758 const char *node;
1759 const char *service;
1761 if (se == NULL)
1762 return (-1);
1764 /* Set up the security structures. */
1765 #if HAVE_LIBGCRYPT /* {{{ */
1766 if (se->type == SOCKENT_TYPE_CLIENT)
1767 {
1768 if (se->data.client.security_level > SECURITY_LEVEL_NONE)
1769 {
1770 if ((se->data.client.username == NULL)
1771 || (se->data.client.password == NULL))
1772 {
1773 ERROR ("network plugin: Client socket with "
1774 "security requested, but no "
1775 "credentials are configured.");
1776 return (-1);
1777 }
1778 gcry_md_hash_buffer (GCRY_MD_SHA256,
1779 se->data.client.password_hash,
1780 se->data.client.password,
1781 strlen (se->data.client.password));
1782 }
1783 }
1784 else /* (se->type == SOCKENT_TYPE_SERVER) */
1785 {
1786 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1787 {
1788 if (se->data.server.auth_file == NULL)
1789 {
1790 ERROR ("network plugin: Server socket with "
1791 "security requested, but no "
1792 "password file is configured.");
1793 return (-1);
1794 }
1795 }
1796 if (se->data.server.auth_file != NULL)
1797 {
1798 se->data.server.userdb = fbh_create (se->data.server.auth_file);
1799 if (se->data.server.userdb == NULL)
1800 {
1801 ERROR ("network plugin: Reading password file "
1802 "`%s' failed.",
1803 se->data.server.auth_file);
1804 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1805 return (-1);
1806 }
1807 }
1808 }
1809 #endif /* }}} HAVE_LIBGCRYPT */
1811 node = se->node;
1812 service = se->service;
1814 if (service == NULL)
1815 service = NET_DEFAULT_PORT;
1817 DEBUG ("network plugin: sockent_open: node = %s; service = %s;",
1818 node, service);
1820 memset (&ai_hints, 0, sizeof (ai_hints));
1821 ai_hints.ai_flags = 0;
1822 #ifdef AI_PASSIVE
1823 ai_hints.ai_flags |= AI_PASSIVE;
1824 #endif
1825 #ifdef AI_ADDRCONFIG
1826 ai_hints.ai_flags |= AI_ADDRCONFIG;
1827 #endif
1828 ai_hints.ai_family = AF_UNSPEC;
1829 ai_hints.ai_socktype = SOCK_DGRAM;
1830 ai_hints.ai_protocol = IPPROTO_UDP;
1832 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1833 if (ai_return != 0)
1834 {
1835 ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s",
1836 (se->node == NULL) ? "(null)" : se->node,
1837 (se->service == NULL) ? "(null)" : se->service,
1838 gai_strerror (ai_return));
1839 return (-1);
1840 }
1842 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1843 {
1844 int status;
1846 if (se->type == SOCKENT_TYPE_SERVER) /* {{{ */
1847 {
1848 int *tmp;
1850 tmp = realloc (se->data.server.fd,
1851 sizeof (*tmp) * (se->data.server.fd_num + 1));
1852 if (tmp == NULL)
1853 {
1854 ERROR ("network plugin: realloc failed.");
1855 continue;
1856 }
1857 se->data.server.fd = tmp;
1858 tmp = se->data.server.fd + se->data.server.fd_num;
1860 *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
1861 ai_ptr->ai_protocol);
1862 if (*tmp < 0)
1863 {
1864 char errbuf[1024];
1865 ERROR ("network plugin: socket(2) failed: %s",
1866 sstrerror (errno, errbuf,
1867 sizeof (errbuf)));
1868 continue;
1869 }
1871 status = network_bind_socket (*tmp, ai_ptr);
1872 if (status != 0)
1873 {
1874 close (*tmp);
1875 *tmp = -1;
1876 continue;
1877 }
1879 se->data.server.fd_num++;
1880 continue;
1881 } /* }}} if (se->type == SOCKENT_TYPE_SERVER) */
1882 else /* if (se->type == SOCKENT_TYPE_CLIENT) {{{ */
1883 {
1884 se->data.client.fd = socket (ai_ptr->ai_family,
1885 ai_ptr->ai_socktype,
1886 ai_ptr->ai_protocol);
1887 if (se->data.client.fd < 0)
1888 {
1889 char errbuf[1024];
1890 ERROR ("network plugin: socket(2) failed: %s",
1891 sstrerror (errno, errbuf,
1892 sizeof (errbuf)));
1893 continue;
1894 }
1896 se->data.client.addr = malloc (sizeof (*se->data.client.addr));
1897 if (se->data.client.addr == NULL)
1898 {
1899 ERROR ("network plugin: malloc failed.");
1900 close (se->data.client.fd);
1901 se->data.client.fd = -1;
1902 continue;
1903 }
1905 memset (se->data.client.addr, 0, sizeof (*se->data.client.addr));
1906 assert (sizeof (*se->data.client.addr) >= ai_ptr->ai_addrlen);
1907 memcpy (se->data.client.addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1908 se->data.client.addrlen = ai_ptr->ai_addrlen;
1910 network_set_ttl (se, ai_ptr);
1912 /* We don't open more than one write-socket per
1913 * node/service pair.. */
1914 break;
1915 } /* }}} if (se->type == SOCKENT_TYPE_CLIENT) */
1916 } /* for (ai_list) */
1918 freeaddrinfo (ai_list);
1920 /* Check if all went well. */
1921 if (se->type == SOCKENT_TYPE_SERVER)
1922 {
1923 if (se->data.server.fd_num <= 0)
1924 return (-1);
1925 }
1926 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
1927 {
1928 if (se->data.client.fd < 0)
1929 return (-1);
1930 }
1932 return (0);
1933 } /* }}} int sockent_open */
1935 /* Add a sockent to the global list of sockets */
1936 static int sockent_add (sockent_t *se) /* {{{ */
1937 {
1938 sockent_t *last_ptr;
1940 if (se == NULL)
1941 return (-1);
1943 if (se->type == SOCKENT_TYPE_SERVER)
1944 {
1945 struct pollfd *tmp;
1946 size_t i;
1948 tmp = realloc (listen_sockets_pollfd,
1949 sizeof (*tmp) * (listen_sockets_num
1950 + se->data.server.fd_num));
1951 if (tmp == NULL)
1952 {
1953 ERROR ("network plugin: realloc failed.");
1954 return (-1);
1955 }
1956 listen_sockets_pollfd = tmp;
1957 tmp = listen_sockets_pollfd + listen_sockets_num;
1959 for (i = 0; i < se->data.server.fd_num; i++)
1960 {
1961 memset (tmp + i, 0, sizeof (*tmp));
1962 tmp[i].fd = se->data.server.fd[i];
1963 tmp[i].events = POLLIN | POLLPRI;
1964 tmp[i].revents = 0;
1965 }
1967 listen_sockets_num += se->data.server.fd_num;
1969 if (listen_sockets == NULL)
1970 {
1971 listen_sockets = se;
1972 return (0);
1973 }
1974 last_ptr = listen_sockets;
1975 }
1976 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
1977 {
1978 if (sending_sockets == NULL)
1979 {
1980 sending_sockets = se;
1981 return (0);
1982 }
1983 last_ptr = sending_sockets;
1984 }
1986 while (last_ptr->next != NULL)
1987 last_ptr = last_ptr->next;
1988 last_ptr->next = se;
1990 return (0);
1991 } /* }}} int sockent_add */
1993 static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */
1994 {
1995 while (42)
1996 {
1997 receive_list_entry_t *ent;
1998 sockent_t *se;
2000 /* Lock and wait for more data to come in */
2001 pthread_mutex_lock (&receive_list_lock);
2002 while ((listen_loop == 0)
2003 && (receive_list_head == NULL))
2004 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
2006 /* Remove the head entry and unlock */
2007 ent = receive_list_head;
2008 if (ent != NULL)
2009 receive_list_head = ent->next;
2010 pthread_mutex_unlock (&receive_list_lock);
2012 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
2013 * because we dispatch all missing packets before shutting down. */
2014 if (ent == NULL)
2015 break;
2017 /* Look for the correct `sockent_t' */
2018 se = listen_sockets;
2019 while (se != NULL)
2020 {
2021 size_t i;
2023 for (i = 0; i < se->data.server.fd_num; i++)
2024 if (se->data.server.fd[i] == ent->fd)
2025 break;
2027 if (i < se->data.server.fd_num)
2028 break;
2030 se = se->next;
2031 }
2033 if (se == NULL)
2034 {
2035 ERROR ("network plugin: Got packet from FD %i, but can't "
2036 "find an appropriate socket entry.",
2037 ent->fd);
2038 sfree (ent);
2039 continue;
2040 }
2042 parse_packet (se, ent->data, ent->data_len, /* flags = */ 0);
2043 sfree (ent);
2044 } /* while (42) */
2046 return (NULL);
2047 } /* }}} void *dispatch_thread */
2049 static int network_receive (void) /* {{{ */
2050 {
2051 char buffer[BUFF_SIZE];
2052 int buffer_len;
2054 int i;
2055 int status;
2057 receive_list_entry_t *private_list_head;
2058 receive_list_entry_t *private_list_tail;
2060 assert (listen_sockets_num > 0);
2062 private_list_head = NULL;
2063 private_list_tail = NULL;
2065 while (listen_loop == 0)
2066 {
2067 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
2069 if (status <= 0)
2070 {
2071 char errbuf[1024];
2072 if (errno == EINTR)
2073 continue;
2074 ERROR ("poll failed: %s",
2075 sstrerror (errno, errbuf, sizeof (errbuf)));
2076 return (-1);
2077 }
2079 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
2080 {
2081 receive_list_entry_t *ent;
2083 if ((listen_sockets_pollfd[i].revents
2084 & (POLLIN | POLLPRI)) == 0)
2085 continue;
2086 status--;
2088 buffer_len = recv (listen_sockets_pollfd[i].fd,
2089 buffer, sizeof (buffer),
2090 0 /* no flags */);
2091 if (buffer_len < 0)
2092 {
2093 char errbuf[1024];
2094 ERROR ("recv failed: %s",
2095 sstrerror (errno, errbuf,
2096 sizeof (errbuf)));
2097 return (-1);
2098 }
2100 /* TODO: Possible performance enhancement: Do not free
2101 * these entries in the dispatch thread but put them in
2102 * another list, so we don't have to allocate more and
2103 * more of these structures. */
2104 ent = malloc (sizeof (receive_list_entry_t));
2105 if (ent == NULL)
2106 {
2107 ERROR ("network plugin: malloc failed.");
2108 return (-1);
2109 }
2110 memset (ent, 0, sizeof (receive_list_entry_t));
2111 ent->fd = listen_sockets_pollfd[i].fd;
2112 ent->next = NULL;
2114 /* Hopefully this be optimized out by the compiler. It
2115 * might help prevent stupid bugs in the future though.
2116 */
2117 assert (sizeof (ent->data) == sizeof (buffer));
2119 memcpy (ent->data, buffer, buffer_len);
2120 ent->data_len = buffer_len;
2122 if (private_list_head == NULL)
2123 private_list_head = ent;
2124 else
2125 private_list_tail->next = ent;
2126 private_list_tail = ent;
2128 /* Do not block here. Blocking here has led to
2129 * insufficient performance in the past. */
2130 if (pthread_mutex_trylock (&receive_list_lock) == 0)
2131 {
2132 if (receive_list_head == NULL)
2133 receive_list_head = private_list_head;
2134 else
2135 receive_list_tail->next = private_list_head;
2136 receive_list_tail = private_list_tail;
2138 private_list_head = NULL;
2139 private_list_tail = NULL;
2141 pthread_cond_signal (&receive_list_cond);
2142 pthread_mutex_unlock (&receive_list_lock);
2143 }
2144 } /* for (listen_sockets_pollfd) */
2145 } /* while (listen_loop == 0) */
2147 /* Make sure everything is dispatched before exiting. */
2148 if (private_list_head != NULL)
2149 {
2150 pthread_mutex_lock (&receive_list_lock);
2152 if (receive_list_head == NULL)
2153 receive_list_head = private_list_head;
2154 else
2155 receive_list_tail->next = private_list_head;
2156 receive_list_tail = private_list_tail;
2158 private_list_head = NULL;
2159 private_list_tail = NULL;
2161 pthread_cond_signal (&receive_list_cond);
2162 pthread_mutex_unlock (&receive_list_lock);
2163 }
2165 return (0);
2166 } /* }}} int network_receive */
2168 static void *receive_thread (void __attribute__((unused)) *arg)
2169 {
2170 return (network_receive () ? (void *) 1 : (void *) 0);
2171 } /* void *receive_thread */
2173 static void network_init_buffer (void)
2174 {
2175 memset (send_buffer, 0, sizeof (send_buffer));
2176 send_buffer_ptr = send_buffer;
2177 send_buffer_fill = 0;
2179 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
2180 } /* int network_init_buffer */
2182 static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */
2183 const char *buffer, size_t buffer_size)
2184 {
2185 int status;
2187 while (42)
2188 {
2189 status = sendto (se->data.client.fd, buffer, buffer_size,
2190 /* flags = */ 0,
2191 (struct sockaddr *) se->data.client.addr,
2192 se->data.client.addrlen);
2193 if (status < 0)
2194 {
2195 char errbuf[1024];
2196 if (errno == EINTR)
2197 continue;
2198 ERROR ("network plugin: sendto failed: %s",
2199 sstrerror (errno, errbuf,
2200 sizeof (errbuf)));
2201 break;
2202 }
2204 break;
2205 } /* while (42) */
2206 } /* }}} void networt_send_buffer_plain */
2208 #if HAVE_LIBGCRYPT
2209 #define BUFFER_ADD(p,s) do { \
2210 memcpy (buffer + buffer_offset, (p), (s)); \
2211 buffer_offset += (s); \
2212 } while (0)
2214 static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */
2215 const char *in_buffer, size_t in_buffer_size)
2216 {
2217 part_signature_sha256_t ps;
2218 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2219 size_t buffer_offset;
2220 size_t username_len;
2222 gcry_md_hd_t hd;
2223 gcry_error_t err;
2224 unsigned char *hash;
2226 hd = NULL;
2227 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
2228 if (err != 0)
2229 {
2230 ERROR ("network plugin: Creating HMAC object failed: %s",
2231 gcry_strerror (err));
2232 return;
2233 }
2235 err = gcry_md_setkey (hd, se->data.client.password,
2236 strlen (se->data.client.password));
2237 if (err != 0)
2238 {
2239 ERROR ("network plugin: gcry_md_setkey failed: %s",
2240 gcry_strerror (err));
2241 gcry_md_close (hd);
2242 return;
2243 }
2245 username_len = strlen (se->data.client.username);
2246 if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE))
2247 {
2248 ERROR ("network plugin: Username too long: %s",
2249 se->data.client.username);
2250 return;
2251 }
2253 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE,
2254 se->data.client.username, username_len);
2255 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len,
2256 in_buffer, in_buffer_size);
2258 /* Initialize the `ps' structure. */
2259 memset (&ps, 0, sizeof (ps));
2260 ps.head.type = htons (TYPE_SIGN_SHA256);
2261 ps.head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len);
2263 /* Calculate the hash value. */
2264 gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE,
2265 username_len + in_buffer_size);
2266 hash = gcry_md_read (hd, GCRY_MD_SHA256);
2267 if (hash == NULL)
2268 {
2269 ERROR ("network plugin: gcry_md_read failed.");
2270 gcry_md_close (hd);
2271 return;
2272 }
2273 memcpy (ps.hash, hash, sizeof (ps.hash));
2275 /* Add the header */
2276 buffer_offset = 0;
2278 BUFFER_ADD (&ps.head.type, sizeof (ps.head.type));
2279 BUFFER_ADD (&ps.head.length, sizeof (ps.head.length));
2280 BUFFER_ADD (ps.hash, sizeof (ps.hash));
2282 assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE);
2284 gcry_md_close (hd);
2285 hd = NULL;
2287 buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size;
2288 networt_send_buffer_plain (se, buffer, buffer_offset);
2289 } /* }}} void networt_send_buffer_signed */
2291 static void networt_send_buffer_encrypted (sockent_t *se, /* {{{ */
2292 const char *in_buffer, size_t in_buffer_size)
2293 {
2294 part_encryption_aes256_t pea;
2295 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2296 size_t buffer_size;
2297 size_t buffer_offset;
2298 size_t header_size;
2299 size_t username_len;
2300 gcry_error_t err;
2301 gcry_cipher_hd_t cypher;
2303 /* Initialize the header fields */
2304 memset (&pea, 0, sizeof (pea));
2305 pea.head.type = htons (TYPE_ENCR_AES256);
2307 pea.username = se->data.client.username;
2309 username_len = strlen (pea.username);
2310 if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE)
2311 {
2312 ERROR ("network plugin: Username too long: %s", pea.username);
2313 return;
2314 }
2316 buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size;
2317 header_size = PART_ENCRYPTION_AES256_SIZE + username_len
2318 - sizeof (pea.hash);
2320 assert (buffer_size <= sizeof (buffer));
2321 DEBUG ("network plugin: networt_send_buffer_encrypted: "
2322 "buffer_size = %zu;", buffer_size);
2324 pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE
2325 + username_len + in_buffer_size));
2326 pea.username_length = htons ((uint16_t) username_len);
2328 /* Chose a random initialization vector. */
2329 gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2331 /* Create hash of the payload */
2332 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2334 /* Initialize the buffer */
2335 buffer_offset = 0;
2336 memset (buffer, 0, sizeof (buffer));
2339 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2340 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2341 BUFFER_ADD (&pea.username_length, sizeof (pea.username_length));
2342 BUFFER_ADD (pea.username, username_len);
2343 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2344 assert (buffer_offset == header_size);
2345 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2346 BUFFER_ADD (in_buffer, in_buffer_size);
2348 assert (buffer_offset == buffer_size);
2350 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
2351 se->data.client.password);
2352 if (cypher == NULL)
2353 return;
2355 /* Encrypt the buffer in-place */
2356 err = gcry_cipher_encrypt (cypher,
2357 buffer + header_size,
2358 buffer_size - header_size,
2359 /* in = */ NULL, /* in len = */ 0);
2360 if (err != 0)
2361 {
2362 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2363 gcry_strerror (err));
2364 return;
2365 }
2367 /* Send it out without further modifications */
2368 networt_send_buffer_plain (se, buffer, buffer_size);
2369 } /* }}} void networt_send_buffer_encrypted */
2370 #undef BUFFER_ADD
2371 #endif /* HAVE_LIBGCRYPT */
2373 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2374 {
2375 sockent_t *se;
2377 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2379 for (se = sending_sockets; se != NULL; se = se->next)
2380 {
2381 #if HAVE_LIBGCRYPT
2382 if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT)
2383 networt_send_buffer_encrypted (se, buffer, buffer_len);
2384 else if (se->data.client.security_level == SECURITY_LEVEL_SIGN)
2385 networt_send_buffer_signed (se, buffer, buffer_len);
2386 else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */
2387 #endif /* HAVE_LIBGCRYPT */
2388 networt_send_buffer_plain (se, buffer, buffer_len);
2389 } /* for (sending_sockets) */
2390 } /* }}} void network_send_buffer */
2392 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
2393 value_list_t *vl_def,
2394 const data_set_t *ds, const value_list_t *vl)
2395 {
2396 char *buffer_orig = buffer;
2398 if (strcmp (vl_def->host, vl->host) != 0)
2399 {
2400 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2401 vl->host, strlen (vl->host)) != 0)
2402 return (-1);
2403 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2404 }
2406 if (vl_def->time != vl->time)
2407 {
2408 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
2409 (uint64_t) vl->time))
2410 return (-1);
2411 vl_def->time = vl->time;
2412 }
2414 if (vl_def->interval != vl->interval)
2415 {
2416 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
2417 (uint64_t) vl->interval))
2418 return (-1);
2419 vl_def->interval = vl->interval;
2420 }
2422 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2423 {
2424 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2425 vl->plugin, strlen (vl->plugin)) != 0)
2426 return (-1);
2427 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2428 }
2430 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2431 {
2432 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2433 vl->plugin_instance,
2434 strlen (vl->plugin_instance)) != 0)
2435 return (-1);
2436 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2437 }
2439 if (strcmp (vl_def->type, vl->type) != 0)
2440 {
2441 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2442 vl->type, strlen (vl->type)) != 0)
2443 return (-1);
2444 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2445 }
2447 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2448 {
2449 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2450 vl->type_instance,
2451 strlen (vl->type_instance)) != 0)
2452 return (-1);
2453 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2454 }
2456 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2457 return (-1);
2459 return (buffer - buffer_orig);
2460 } /* }}} int add_to_buffer */
2462 static void flush_buffer (void)
2463 {
2464 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2465 send_buffer_fill);
2467 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2468 network_init_buffer ();
2469 }
2471 static int network_write (const data_set_t *ds, const value_list_t *vl,
2472 user_data_t __attribute__((unused)) *user_data)
2473 {
2474 int status;
2476 /* If the value is already in the cache, we have received it via the
2477 * network. We write it again if forwarding is activated. It's then in
2478 * the cache and should we receive it again we will ignore it. */
2479 status = cache_check (vl);
2480 if ((network_config_forward == 0)
2481 && (status != 0))
2482 return (0);
2484 pthread_mutex_lock (&send_buffer_lock);
2486 status = add_to_buffer (send_buffer_ptr,
2487 sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
2488 &send_buffer_vl,
2489 ds, vl);
2490 if (status >= 0)
2491 {
2492 /* status == bytes added to the buffer */
2493 send_buffer_fill += status;
2494 send_buffer_ptr += status;
2495 }
2496 else
2497 {
2498 flush_buffer ();
2500 status = add_to_buffer (send_buffer_ptr,
2501 sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
2502 &send_buffer_vl,
2503 ds, vl);
2505 if (status >= 0)
2506 {
2507 send_buffer_fill += status;
2508 send_buffer_ptr += status;
2509 }
2510 }
2512 if (status < 0)
2513 {
2514 ERROR ("network plugin: Unable to append to the "
2515 "buffer for some weird reason");
2516 }
2517 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
2518 {
2519 flush_buffer ();
2520 }
2522 pthread_mutex_unlock (&send_buffer_lock);
2524 return ((status < 0) ? -1 : 0);
2525 } /* int network_write */
2527 static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
2528 int *retval)
2529 {
2530 if ((ci->values_num != 1)
2531 || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
2532 && (ci->values[0].type != OCONFIG_TYPE_STRING)))
2533 {
2534 ERROR ("network plugin: The `%s' config option needs "
2535 "exactly one boolean argument.", ci->key);
2536 return (-1);
2537 }
2539 if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
2540 {
2541 if (ci->values[0].value.boolean)
2542 *retval = 1;
2543 else
2544 *retval = 0;
2545 }
2546 else
2547 {
2548 char *str = ci->values[0].value.string;
2550 if ((strcasecmp ("true", str) == 0)
2551 || (strcasecmp ("yes", str) == 0)
2552 || (strcasecmp ("on", str) == 0))
2553 *retval = 1;
2554 else if ((strcasecmp ("false", str) == 0)
2555 || (strcasecmp ("no", str) == 0)
2556 || (strcasecmp ("off", str) == 0))
2557 *retval = 0;
2558 else
2559 {
2560 ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
2561 "option as boolean value.",
2562 str, ci->key);
2563 return (-1);
2564 }
2565 }
2567 return (0);
2568 } /* }}} int network_config_set_boolean */
2570 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2571 {
2572 int tmp;
2573 if ((ci->values_num != 1)
2574 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2575 {
2576 WARNING ("network plugin: The `TimeToLive' config option needs exactly "
2577 "one numeric argument.");
2578 return (-1);
2579 }
2581 tmp = (int) ci->values[0].value.number;
2582 if ((tmp > 0) && (tmp <= 255))
2583 network_config_ttl = tmp;
2585 return (0);
2586 } /* }}} int network_config_set_ttl */
2588 #if HAVE_LIBGCRYPT
2589 static int network_config_set_string (const oconfig_item_t *ci, /* {{{ */
2590 char **ret_string)
2591 {
2592 char *tmp;
2593 if ((ci->values_num != 1)
2594 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2595 {
2596 WARNING ("network plugin: The `%s' config option needs exactly "
2597 "one string argument.", ci->key);
2598 return (-1);
2599 }
2601 tmp = strdup (ci->values[0].value.string);
2602 if (tmp == NULL)
2603 return (-1);
2605 sfree (*ret_string);
2606 *ret_string = tmp;
2608 return (0);
2609 } /* }}} int network_config_set_string */
2610 #endif /* HAVE_LIBGCRYPT */
2612 #if HAVE_LIBGCRYPT
2613 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
2614 int *retval)
2615 {
2616 char *str;
2617 if ((ci->values_num != 1)
2618 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2619 {
2620 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
2621 "one string argument.");
2622 return (-1);
2623 }
2625 str = ci->values[0].value.string;
2626 if (strcasecmp ("Encrypt", str) == 0)
2627 *retval = SECURITY_LEVEL_ENCRYPT;
2628 else if (strcasecmp ("Sign", str) == 0)
2629 *retval = SECURITY_LEVEL_SIGN;
2630 else if (strcasecmp ("None", str) == 0)
2631 *retval = SECURITY_LEVEL_NONE;
2632 else
2633 {
2634 WARNING ("network plugin: Unknown security level: %s.", str);
2635 return (-1);
2636 }
2638 return (0);
2639 } /* }}} int network_config_set_security_level */
2640 #endif /* HAVE_LIBGCRYPT */
2642 static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */
2643 {
2644 sockent_t *se;
2645 int status;
2646 int i;
2648 if ((ci->values_num < 1) || (ci->values_num > 2)
2649 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2650 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2651 {
2652 ERROR ("network plugin: The `%s' config option needs "
2653 "one or two string arguments.", ci->key);
2654 return (-1);
2655 }
2657 se = malloc (sizeof (*se));
2658 if (se == NULL)
2659 {
2660 ERROR ("network plugin: malloc failed.");
2661 return (-1);
2662 }
2663 sockent_init (se, SOCKENT_TYPE_SERVER);
2665 se->node = strdup (ci->values[0].value.string);
2666 if (ci->values_num >= 2)
2667 se->service = strdup (ci->values[1].value.string);
2669 for (i = 0; i < ci->children_num; i++)
2670 {
2671 oconfig_item_t *child = ci->children + i;
2673 #if HAVE_LIBGCRYPT
2674 if (strcasecmp ("AuthFile", child->key) == 0)
2675 network_config_set_string (child, &se->data.server.auth_file);
2676 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2677 network_config_set_security_level (child,
2678 &se->data.server.security_level);
2679 else
2680 #endif /* HAVE_LIBGCRYPT */
2681 {
2682 WARNING ("network plugin: Option `%s' is not allowed here.",
2683 child->key);
2684 }
2685 }
2687 #if HAVE_LIBGCRYPT
2688 if ((se->data.server.security_level > SECURITY_LEVEL_NONE)
2689 && (se->data.server.auth_file == NULL))
2690 {
2691 ERROR ("network plugin: A security level higher than `none' was "
2692 "requested, but no AuthFile option was given. Cowardly refusing to "
2693 "open this socket!");
2694 sockent_destroy (se);
2695 return (-1);
2696 }
2697 #endif /* HAVE_LIBGCRYPT */
2699 status = sockent_open (se);
2700 if (status != 0)
2701 {
2702 ERROR ("network plugin: network_config_add_listen: sockent_open failed.");
2703 sockent_destroy (se);
2704 return (-1);
2705 }
2707 status = sockent_add (se);
2708 if (status != 0)
2709 {
2710 ERROR ("network plugin: network_config_add_listen: sockent_add failed.");
2711 sockent_destroy (se);
2712 return (-1);
2713 }
2715 return (0);
2716 } /* }}} int network_config_add_listen */
2718 static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */
2719 {
2720 sockent_t *se;
2721 int status;
2722 int i;
2724 if ((ci->values_num < 1) || (ci->values_num > 2)
2725 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2726 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2727 {
2728 ERROR ("network plugin: The `%s' config option needs "
2729 "one or two string arguments.", ci->key);
2730 return (-1);
2731 }
2733 se = malloc (sizeof (*se));
2734 if (se == NULL)
2735 {
2736 ERROR ("network plugin: malloc failed.");
2737 return (-1);
2738 }
2739 sockent_init (se, SOCKENT_TYPE_CLIENT);
2741 se->node = strdup (ci->values[0].value.string);
2742 if (ci->values_num >= 2)
2743 se->service = strdup (ci->values[1].value.string);
2745 for (i = 0; i < ci->children_num; i++)
2746 {
2747 oconfig_item_t *child = ci->children + i;
2749 #if HAVE_LIBGCRYPT
2750 if (strcasecmp ("Username", child->key) == 0)
2751 network_config_set_string (child, &se->data.client.username);
2752 else if (strcasecmp ("Password", child->key) == 0)
2753 network_config_set_string (child, &se->data.client.password);
2754 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2755 network_config_set_security_level (child,
2756 &se->data.client.security_level);
2757 else
2758 #endif /* HAVE_LIBGCRYPT */
2759 {
2760 WARNING ("network plugin: Option `%s' is not allowed here.",
2761 child->key);
2762 }
2763 }
2765 #if HAVE_LIBGCRYPT
2766 if ((se->data.client.security_level > SECURITY_LEVEL_NONE)
2767 && ((se->data.client.username == NULL)
2768 || (se->data.client.password == NULL)))
2769 {
2770 ERROR ("network plugin: A security level higher than `none' was "
2771 "requested, but no Username or Password option was given. "
2772 "Cowardly refusing to open this socket!");
2773 sockent_destroy (se);
2774 return (-1);
2775 }
2776 #endif /* HAVE_LIBGCRYPT */
2778 status = sockent_open (se);
2779 if (status != 0)
2780 {
2781 ERROR ("network plugin: network_config_add_server: sockent_open failed.");
2782 sockent_destroy (se);
2783 return (-1);
2784 }
2786 status = sockent_add (se);
2787 if (status != 0)
2788 {
2789 ERROR ("network plugin: network_config_add_server: sockent_add failed.");
2790 sockent_destroy (se);
2791 return (-1);
2792 }
2794 return (0);
2795 } /* }}} int network_config_add_server */
2797 static int network_config_set_cache_flush (const oconfig_item_t *ci) /* {{{ */
2798 {
2799 int tmp;
2800 if ((ci->values_num != 1)
2801 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2802 {
2803 WARNING ("network plugin: The `CacheFlush' config option needs exactly "
2804 "one numeric argument.");
2805 return (-1);
2806 }
2808 tmp = (int) ci->values[0].value.number;
2809 if (tmp > 0)
2810 network_config_ttl = tmp;
2812 return (0);
2813 } /* }}} int network_config_set_cache_flush */
2815 static int network_config (oconfig_item_t *ci) /* {{{ */
2816 {
2817 int i;
2819 for (i = 0; i < ci->children_num; i++)
2820 {
2821 oconfig_item_t *child = ci->children + i;
2823 if (strcasecmp ("Listen", child->key) == 0)
2824 network_config_add_listen (child);
2825 else if (strcasecmp ("Server", child->key) == 0)
2826 network_config_add_server (child);
2827 else if (strcasecmp ("TimeToLive", child->key) == 0)
2828 network_config_set_ttl (child);
2829 else if (strcasecmp ("Forward", child->key) == 0)
2830 network_config_set_boolean (child, &network_config_forward);
2831 else if (strcasecmp ("CacheFlush", child->key) == 0)
2832 network_config_set_cache_flush (child);
2833 else
2834 {
2835 WARNING ("network plugin: Option `%s' is not allowed here.",
2836 child->key);
2837 }
2838 }
2840 return (0);
2841 } /* }}} int network_config */
2843 static int network_notification (const notification_t *n,
2844 user_data_t __attribute__((unused)) *user_data)
2845 {
2846 char buffer[BUFF_SIZE];
2847 char *buffer_ptr = buffer;
2848 int buffer_free = sizeof (buffer);
2849 int status;
2851 memset (buffer, '\0', sizeof (buffer));
2854 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
2855 (uint64_t) n->time);
2856 if (status != 0)
2857 return (-1);
2859 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
2860 (uint64_t) n->severity);
2861 if (status != 0)
2862 return (-1);
2864 if (strlen (n->host) > 0)
2865 {
2866 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
2867 n->host, strlen (n->host));
2868 if (status != 0)
2869 return (-1);
2870 }
2872 if (strlen (n->plugin) > 0)
2873 {
2874 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
2875 n->plugin, strlen (n->plugin));
2876 if (status != 0)
2877 return (-1);
2878 }
2880 if (strlen (n->plugin_instance) > 0)
2881 {
2882 status = write_part_string (&buffer_ptr, &buffer_free,
2883 TYPE_PLUGIN_INSTANCE,
2884 n->plugin_instance, strlen (n->plugin_instance));
2885 if (status != 0)
2886 return (-1);
2887 }
2889 if (strlen (n->type) > 0)
2890 {
2891 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
2892 n->type, strlen (n->type));
2893 if (status != 0)
2894 return (-1);
2895 }
2897 if (strlen (n->type_instance) > 0)
2898 {
2899 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
2900 n->type_instance, strlen (n->type_instance));
2901 if (status != 0)
2902 return (-1);
2903 }
2905 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
2906 n->message, strlen (n->message));
2907 if (status != 0)
2908 return (-1);
2910 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
2912 return (0);
2913 } /* int network_notification */
2915 static int network_shutdown (void)
2916 {
2917 listen_loop++;
2919 /* Kill the listening thread */
2920 if (receive_thread_running != 0)
2921 {
2922 INFO ("network plugin: Stopping receive thread.");
2923 pthread_kill (receive_thread_id, SIGTERM);
2924 pthread_join (receive_thread_id, NULL /* no return value */);
2925 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
2926 receive_thread_running = 0;
2927 }
2929 /* Shutdown the dispatching thread */
2930 if (dispatch_thread_running != 0)
2931 {
2932 INFO ("network plugin: Stopping dispatch thread.");
2933 pthread_mutex_lock (&receive_list_lock);
2934 pthread_cond_broadcast (&receive_list_cond);
2935 pthread_mutex_unlock (&receive_list_lock);
2936 pthread_join (dispatch_thread_id, /* ret = */ NULL);
2937 dispatch_thread_running = 0;
2938 }
2940 sockent_destroy (listen_sockets);
2942 if (send_buffer_fill > 0)
2943 flush_buffer ();
2945 if (cache_tree != NULL)
2946 {
2947 void *key;
2948 void *value;
2950 while (c_avl_pick (cache_tree, &key, &value) == 0)
2951 {
2952 sfree (key);
2953 sfree (value);
2954 }
2955 c_avl_destroy (cache_tree);
2956 cache_tree = NULL;
2957 }
2959 /* TODO: Close `sending_sockets' */
2961 plugin_unregister_config ("network");
2962 plugin_unregister_init ("network");
2963 plugin_unregister_write ("network");
2964 plugin_unregister_shutdown ("network");
2966 /* Let the init function do it's move again ;) */
2967 cache_flush_last = 0;
2969 return (0);
2970 } /* int network_shutdown */
2972 static int network_init (void)
2973 {
2974 /* Check if we were already initialized. If so, just return - there's
2975 * nothing more to do (for now, that is). */
2976 if (cache_flush_last != 0)
2977 return (0);
2979 plugin_register_shutdown ("network", network_shutdown);
2981 network_init_buffer ();
2983 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
2984 cache_flush_last = time (NULL);
2986 /* setup socket(s) and so on */
2987 if (sending_sockets != NULL)
2988 {
2989 plugin_register_write ("network", network_write,
2990 /* user_data = */ NULL);
2991 plugin_register_notification ("network", network_notification,
2992 /* user_data = */ NULL);
2993 }
2995 /* If no threads need to be started, return here. */
2996 if ((listen_sockets_num == 0)
2997 || ((dispatch_thread_running != 0)
2998 && (receive_thread_running != 0)))
2999 return (0);
3001 if (dispatch_thread_running == 0)
3002 {
3003 int status;
3004 status = pthread_create (&dispatch_thread_id,
3005 NULL /* no attributes */,
3006 dispatch_thread,
3007 NULL /* no argument */);
3008 if (status != 0)
3009 {
3010 char errbuf[1024];
3011 ERROR ("network: pthread_create failed: %s",
3012 sstrerror (errno, errbuf,
3013 sizeof (errbuf)));
3014 }
3015 else
3016 {
3017 dispatch_thread_running = 1;
3018 }
3019 }
3021 if (receive_thread_running == 0)
3022 {
3023 int status;
3024 status = pthread_create (&receive_thread_id,
3025 NULL /* no attributes */,
3026 receive_thread,
3027 NULL /* no argument */);
3028 if (status != 0)
3029 {
3030 char errbuf[1024];
3031 ERROR ("network: pthread_create failed: %s",
3032 sstrerror (errno, errbuf,
3033 sizeof (errbuf)));
3034 }
3035 else
3036 {
3037 receive_thread_running = 1;
3038 }
3039 }
3041 return (0);
3042 } /* int network_init */
3044 /*
3045 * The flush option of the network plugin cannot flush individual identifiers.
3046 * All the values are added to a buffer and sent when the buffer is full, the
3047 * requested value may or may not be in there, it's not worth finding out. We
3048 * just send the buffer if `flush' is called - if the requested value was in
3049 * there, good. If not, well, then there is nothing to flush.. -octo
3050 */
3051 static int network_flush (int timeout,
3052 const char __attribute__((unused)) *identifier,
3053 user_data_t __attribute__((unused)) *user_data)
3054 {
3055 pthread_mutex_lock (&send_buffer_lock);
3057 if (((time (NULL) - cache_flush_last) >= timeout)
3058 && (send_buffer_fill > 0))
3059 {
3060 flush_buffer ();
3061 }
3063 pthread_mutex_unlock (&send_buffer_lock);
3065 return (0);
3066 } /* int network_flush */
3068 void module_register (void)
3069 {
3070 plugin_register_complex_config ("network", network_config);
3071 plugin_register_init ("network", network_init);
3072 plugin_register_flush ("network", network_flush,
3073 /* user_data = */ NULL);
3074 } /* void module_register */
3076 /* vim: set fdm=marker : */