2 * collectd - src/network.c
3 * Copyright (C) 2005-2013 Florian octo Forster
4 * Copyright (C) 2009 Aman Gupta
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation; only version 2.1 of the License is
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 * Florian octo Forster <octo at collectd.org>
22 * Aman Gupta <aman at tmm1.net>
25 #define _DEFAULT_SOURCE
26 #define _BSD_SOURCE /* For struct ip_mreq */
32 #include "configfile.h"
33 #include "utils_fbhash.h"
34 #include "utils_cache.h"
35 #include "utils_complain.h"
43 # include <netinet/in.h>
46 # include <arpa/inet.h>
56 # if defined __APPLE__
57 /* default xcode compiler throws warnings even when deprecated functionality
58 * is not used. -Werror breaks the build because of erroneous warnings.
59 * http://stackoverflow.com/questions/10556299/compiler-warnings-with-libgcrypt-v1-5-0/12830209#12830209
61 # pragma GCC diagnostic ignored "-Wdeprecated-declarations"
63 /* FreeBSD's copy of libgcrypt extends the existing GCRYPT_NO_DEPRECATED
64 * to properly hide all deprecated functionality.
65 * http://svnweb.freebsd.org/ports/head/security/libgcrypt/files/patch-src__gcrypt.h.in
67 # define GCRYPT_NO_DEPRECATED
69 # if defined __APPLE__
70 /* Re enable deprecation warnings */
71 # pragma GCC diagnostic warning "-Wdeprecated-declarations"
73 # if GCRYPT_VERSION_NUMBER < 0x010600
74 GCRY_THREAD_OPTION_PTHREAD_IMPL;
78 #ifndef IPV6_ADD_MEMBERSHIP
79 # ifdef IPV6_JOIN_GROUP
80 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
82 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
84 #endif /* !IP_ADD_MEMBERSHIP */
87 * Maximum size required for encryption / signing:
89 * 42 bytes for the encryption header
90 * + 64 bytes for the username
94 #define BUFF_SIG_SIZE 106
99 #define SECURITY_LEVEL_NONE 0
101 # define SECURITY_LEVEL_SIGN 1
102 # define SECURITY_LEVEL_ENCRYPT 2
104 struct sockent_client
107 struct sockaddr_storage *addr;
113 gcry_cipher_hd_t cypher;
114 unsigned char password_hash[32];
116 cdtime_t next_resolve_reconnect;
117 cdtime_t resolve_interval;
120 struct sockent_server
128 gcry_cipher_hd_t cypher;
132 typedef struct sockent
134 #define SOCKENT_TYPE_CLIENT 1
135 #define SOCKENT_TYPE_SERVER 2
144 struct sockent_client client;
145 struct sockent_server server;
148 struct sockent *next;
151 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
152 * 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
153 * +-------+-----------------------+-------------------------------+
154 * ! Ver. ! ! Length !
155 * +-------+-----------------------+-------------------------------+
162 typedef struct part_header_s part_header_t;
164 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
165 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
166 * +-------------------------------+-------------------------------+
168 * +-------------------------------+-------------------------------+
169 * : (Length - 4) Bytes :
170 * +---------------------------------------------------------------+
177 typedef struct part_string_s part_string_t;
179 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
180 * 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
181 * +-------------------------------+-------------------------------+
183 * +-------------------------------+-------------------------------+
184 * : (Length - 4 == 2 || 4 || 8) Bytes :
185 * +---------------------------------------------------------------+
192 typedef struct part_number_s part_number_t;
194 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
195 * 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
196 * +-------------------------------+-------------------------------+
198 * +-------------------------------+---------------+---------------+
199 * ! Num of values ! Type0 ! Type1 !
200 * +-------------------------------+---------------+---------------+
203 * +---------------------------------------------------------------+
206 * +---------------------------------------------------------------+
211 uint16_t *num_values;
212 uint8_t *values_types;
215 typedef struct part_values_s part_values_t;
217 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
218 * 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
219 * +-------------------------------+-------------------------------+
221 * +-------------------------------+-------------------------------+
222 * ! Hash (Bits 0 - 31) !
224 * ! Hash (Bits 224 - 255) !
225 * +---------------------------------------------------------------+
228 #define PART_SIGNATURE_SHA256_SIZE 36
229 struct part_signature_sha256_s
232 unsigned char hash[32];
235 typedef struct part_signature_sha256_s part_signature_sha256_t;
237 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
238 * 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
239 * +-------------------------------+-------------------------------+
241 * +-------------------------------+-------------------------------+
242 * ! Original length ! Padding (0 - 15 bytes) !
243 * +-------------------------------+-------------------------------+
244 * ! Hash (Bits 0 - 31) !
246 * ! Hash (Bits 128 - 159) !
247 * +---------------------------------------------------------------+
250 #define PART_ENCRYPTION_AES256_SIZE 42
251 struct part_encryption_aes256_s
254 uint16_t username_length;
256 unsigned char iv[16];
258 unsigned char hash[20];
262 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
264 struct receive_list_entry_s
269 struct receive_list_entry_s *next;
271 typedef struct receive_list_entry_s receive_list_entry_t;
276 static int network_config_ttl = 0;
277 /* Ethernet - (IPv6 + UDP) = 1500 - (40 + 8) = 1452 */
278 static size_t network_config_packet_size = 1452;
279 static _Bool network_config_forward = 0;
280 static _Bool network_config_stats = 0;
282 static sockent_t *sending_sockets = NULL;
284 static receive_list_entry_t *receive_list_head = NULL;
285 static receive_list_entry_t *receive_list_tail = NULL;
286 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
287 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
288 static uint64_t receive_list_length = 0;
290 static sockent_t *listen_sockets = NULL;
291 static struct pollfd *listen_sockets_pollfd = NULL;
292 static size_t listen_sockets_num = 0;
294 /* The receive and dispatch threads will run as long as `listen_loop' is set to
296 static int listen_loop = 0;
297 static int receive_thread_running = 0;
298 static pthread_t receive_thread_id;
299 static int dispatch_thread_running = 0;
300 static pthread_t dispatch_thread_id;
302 /* Buffer in which to-be-sent network packets are constructed. */
303 static char *send_buffer;
304 static char *send_buffer_ptr;
305 static int send_buffer_fill;
306 static cdtime_t send_buffer_last_update;
307 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
308 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
310 /* XXX: These counters are incremented from one place only. The spot in which
311 * the values are incremented is either only reachable by one thread (the
312 * dispatch thread, for example) or locked by some lock (send_buffer_lock for
313 * example). Only if neither is true, the stats_lock is acquired. The counters
314 * are always read without holding a lock in the hope that writing 8 bytes to
315 * memory is an atomic operation. */
316 static derive_t stats_octets_rx = 0;
317 static derive_t stats_octets_tx = 0;
318 static derive_t stats_packets_rx = 0;
319 static derive_t stats_packets_tx = 0;
320 static derive_t stats_values_dispatched = 0;
321 static derive_t stats_values_not_dispatched = 0;
322 static derive_t stats_values_sent = 0;
323 static derive_t stats_values_not_sent = 0;
324 static pthread_mutex_t stats_lock = PTHREAD_MUTEX_INITIALIZER;
329 static _Bool check_receive_okay (const value_list_t *vl) /* {{{ */
331 uint64_t time_sent = 0;
334 status = uc_meta_data_get_unsigned_int (vl,
335 "network:time_sent", &time_sent);
337 /* This is a value we already sent. Don't allow it to be received again in
338 * order to avoid looping. */
339 if ((status == 0) && (time_sent >= ((uint64_t) vl->time)))
343 } /* }}} _Bool check_receive_okay */
345 static _Bool check_send_okay (const value_list_t *vl) /* {{{ */
350 if (network_config_forward)
353 if (vl->meta == NULL)
356 status = meta_data_get_boolean (vl->meta, "network:received", &received);
357 if (status == -ENOENT)
359 else if (status != 0)
361 ERROR ("network plugin: check_send_okay: meta_data_get_boolean failed "
362 "with status %i.", status);
366 /* By default, only *send* value lists that were not *received* by the
369 } /* }}} _Bool check_send_okay */
371 static _Bool check_notify_received (const notification_t *n) /* {{{ */
373 for (notification_meta_t *ptr = n->meta; ptr != NULL; ptr = ptr->next)
374 if ((strcmp ("network:received", ptr->name) == 0)
375 && (ptr->type == NM_TYPE_BOOLEAN))
376 return ((_Bool) ptr->nm_value.nm_boolean);
379 } /* }}} _Bool check_notify_received */
381 static _Bool check_send_notify_okay (const notification_t *n) /* {{{ */
383 static c_complain_t complain_forwarding = C_COMPLAIN_INIT_STATIC;
389 received = check_notify_received (n);
391 if (network_config_forward && received)
393 c_complain_once (LOG_ERR, &complain_forwarding,
394 "network plugin: A notification has been received via the network "
395 "and forwarding is enabled. Forwarding of notifications is currently "
396 "not supported, because there is not loop-deteciton available. "
397 "Please contact the collectd mailing list if you need this "
401 /* By default, only *send* value lists that were not *received* by the
404 } /* }}} _Bool check_send_notify_okay */
406 static int network_dispatch_values (value_list_t *vl, /* {{{ */
407 const char *username)
412 || (strlen (vl->host) == 0)
413 || (strlen (vl->plugin) == 0)
414 || (strlen (vl->type) == 0))
417 if (!check_receive_okay (vl))
420 char name[6*DATA_MAX_NAME_LEN];
421 FORMAT_VL (name, sizeof (name), vl);
422 name[sizeof (name) - 1] = 0;
423 DEBUG ("network plugin: network_dispatch_values: "
424 "NOT dispatching %s.", name);
426 stats_values_not_dispatched++;
430 assert (vl->meta == NULL);
432 vl->meta = meta_data_create ();
433 if (vl->meta == NULL)
435 ERROR ("network plugin: meta_data_create failed.");
439 status = meta_data_add_boolean (vl->meta, "network:received", 1);
442 ERROR ("network plugin: meta_data_add_boolean failed.");
443 meta_data_destroy (vl->meta);
448 if (username != NULL)
450 status = meta_data_add_string (vl->meta, "network:username", username);
453 ERROR ("network plugin: meta_data_add_string failed.");
454 meta_data_destroy (vl->meta);
460 plugin_dispatch_values (vl);
461 stats_values_dispatched++;
463 meta_data_destroy (vl->meta);
467 } /* }}} int network_dispatch_values */
469 static int network_dispatch_notification (notification_t *n) /* {{{ */
473 assert (n->meta == NULL);
475 status = plugin_notification_meta_add_boolean (n, "network:received", 1);
478 ERROR ("network plugin: plugin_notification_meta_add_boolean failed.");
479 plugin_notification_meta_free (n->meta);
484 status = plugin_dispatch_notification (n);
486 plugin_notification_meta_free (n->meta);
490 } /* }}} int network_dispatch_notification */
493 static int network_init_gcrypt (void) /* {{{ */
497 /* http://lists.gnupg.org/pipermail/gcrypt-devel/2003-August/000458.html
498 * Because you can't know in a library whether another library has
499 * already initialized the library */
500 if (gcry_control (GCRYCTL_ANY_INITIALIZATION_P))
503 /* http://www.gnupg.org/documentation/manuals/gcrypt/Multi_002dThreading.html
504 * To ensure thread-safety, it's important to set GCRYCTL_SET_THREAD_CBS
505 * *before* initalizing Libgcrypt with gcry_check_version(), which itself must
506 * be called before any other gcry_* function. GCRYCTL_ANY_INITIALIZATION_P
507 * above doesn't count, as it doesn't implicitly initalize Libgcrypt.
509 * tl;dr: keep all these gry_* statements in this exact order please. */
510 # if GCRYPT_VERSION_NUMBER < 0x010600
511 err = gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
514 ERROR ("network plugin: gcry_control (GCRYCTL_SET_THREAD_CBS) failed: %s", gcry_strerror (err));
519 gcry_check_version (NULL);
521 err = gcry_control (GCRYCTL_INIT_SECMEM, 32768);
524 ERROR ("network plugin: gcry_control (GCRYCTL_INIT_SECMEM) failed: %s", gcry_strerror (err));
528 gcry_control (GCRYCTL_INITIALIZATION_FINISHED);
530 } /* }}} int network_init_gcrypt */
532 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
533 const void *iv, size_t iv_size, const char *username)
536 gcry_cipher_hd_t *cyper_ptr;
537 unsigned char password_hash[32];
539 if (se->type == SOCKENT_TYPE_CLIENT)
541 cyper_ptr = &se->data.client.cypher;
542 memcpy (password_hash, se->data.client.password_hash,
543 sizeof (password_hash));
549 cyper_ptr = &se->data.server.cypher;
551 if (username == NULL)
554 secret = fbh_get (se->data.server.userdb, username);
558 gcry_md_hash_buffer (GCRY_MD_SHA256,
560 secret, strlen (secret));
565 if (*cyper_ptr == NULL)
567 err = gcry_cipher_open (cyper_ptr,
568 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0);
571 ERROR ("network plugin: gcry_cipher_open returned: %s",
572 gcry_strerror (err));
579 gcry_cipher_reset (*cyper_ptr);
581 assert (*cyper_ptr != NULL);
583 err = gcry_cipher_setkey (*cyper_ptr,
584 password_hash, sizeof (password_hash));
587 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
588 gcry_strerror (err));
589 gcry_cipher_close (*cyper_ptr);
594 err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size);
597 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
598 gcry_strerror (err));
599 gcry_cipher_close (*cyper_ptr);
605 } /* }}} int network_get_aes256_cypher */
606 #endif /* HAVE_LIBGCRYPT */
608 static int write_part_values (char **ret_buffer, size_t *ret_buffer_len,
609 const data_set_t *ds, const value_list_t *vl)
615 part_header_t pkg_ph;
616 uint16_t pkg_num_values;
617 uint8_t *pkg_values_types;
622 num_values = vl->values_len;
623 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
624 + (num_values * sizeof (uint8_t))
625 + (num_values * sizeof (value_t));
627 if (*ret_buffer_len < packet_len)
630 pkg_values_types = malloc (num_values * sizeof (*pkg_values_types));
631 if (pkg_values_types == NULL)
633 ERROR ("network plugin: write_part_values: malloc failed.");
637 pkg_values = malloc (num_values * sizeof (*pkg_values));
638 if (pkg_values == NULL)
640 free (pkg_values_types);
641 ERROR ("network plugin: write_part_values: malloc failed.");
645 pkg_ph.type = htons (TYPE_VALUES);
646 pkg_ph.length = htons (packet_len);
648 pkg_num_values = htons ((uint16_t) vl->values_len);
650 for (int i = 0; i < num_values; i++)
652 pkg_values_types[i] = (uint8_t) ds->ds[i].type;
653 switch (ds->ds[i].type)
655 case DS_TYPE_COUNTER:
656 pkg_values[i].counter = htonll (vl->values[i].counter);
660 pkg_values[i].gauge = htond (vl->values[i].gauge);
664 pkg_values[i].derive = htonll (vl->values[i].derive);
667 case DS_TYPE_ABSOLUTE:
668 pkg_values[i].absolute = htonll (vl->values[i].absolute);
672 free (pkg_values_types);
674 ERROR ("network plugin: write_part_values: "
675 "Unknown data source type: %i",
678 } /* switch (ds->ds[i].type) */
679 } /* for (num_values) */
682 * Use `memcpy' to write everything to the buffer, because the pointer
683 * may be unaligned and some architectures, such as SPARC, can't handle
686 packet_ptr = *ret_buffer;
688 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
689 offset += sizeof (pkg_ph);
690 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
691 offset += sizeof (pkg_num_values);
692 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
693 offset += num_values * sizeof (uint8_t);
694 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
695 offset += num_values * sizeof (value_t);
697 assert (offset == packet_len);
699 *ret_buffer = packet_ptr + packet_len;
700 *ret_buffer_len -= packet_len;
702 free (pkg_values_types);
706 } /* int write_part_values */
708 static int write_part_number (char **ret_buffer, size_t *ret_buffer_len,
709 int type, uint64_t value)
714 part_header_t pkg_head;
719 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
721 if (*ret_buffer_len < packet_len)
724 pkg_head.type = htons (type);
725 pkg_head.length = htons (packet_len);
726 pkg_value = htonll (value);
728 packet_ptr = *ret_buffer;
730 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
731 offset += sizeof (pkg_head);
732 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
733 offset += sizeof (pkg_value);
735 assert (offset == packet_len);
737 *ret_buffer = packet_ptr + packet_len;
738 *ret_buffer_len -= packet_len;
741 } /* int write_part_number */
743 static int write_part_string (char **ret_buffer, size_t *ret_buffer_len,
744 int type, const char *str, size_t str_len)
754 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
755 if (*ret_buffer_len < buffer_len)
758 pkg_type = htons (type);
759 pkg_length = htons (buffer_len);
761 buffer = *ret_buffer;
763 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
764 offset += sizeof (pkg_type);
765 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
766 offset += sizeof (pkg_length);
767 memcpy (buffer + offset, str, str_len);
769 memset (buffer + offset, '\0', 1);
772 assert (offset == buffer_len);
774 *ret_buffer = buffer + buffer_len;
775 *ret_buffer_len -= buffer_len;
778 } /* int write_part_string */
780 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
781 value_t **ret_values, size_t *ret_num_values)
783 char *buffer = *ret_buffer;
784 size_t buffer_len = *ret_buffer_len;
798 NOTICE ("network plugin: packet is too short: "
799 "buffer_len = %zu", buffer_len);
803 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
804 buffer += sizeof (tmp16);
805 pkg_type = ntohs (tmp16);
807 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
808 buffer += sizeof (tmp16);
809 pkg_length = ntohs (tmp16);
811 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
812 buffer += sizeof (tmp16);
813 pkg_numval = (size_t) ntohs (tmp16);
815 assert (pkg_type == TYPE_VALUES);
817 exp_size = 3 * sizeof (uint16_t)
818 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
819 if (buffer_len < exp_size)
821 WARNING ("network plugin: parse_part_values: "
823 "Chunk of size %zu expected, "
824 "but buffer has only %zu bytes left.",
825 exp_size, buffer_len);
828 assert (pkg_numval <= ((buffer_len - 6) / 9));
830 if (pkg_length != exp_size)
832 WARNING ("network plugin: parse_part_values: "
833 "Length and number of values "
834 "in the packet don't match.");
838 pkg_types = calloc (pkg_numval, sizeof (*pkg_types));
839 pkg_values = calloc (pkg_numval, sizeof (*pkg_values));
840 if ((pkg_types == NULL) || (pkg_values == NULL))
844 ERROR ("network plugin: parse_part_values: calloc failed.");
848 memcpy (pkg_types, buffer, pkg_numval * sizeof (*pkg_types));
849 buffer += pkg_numval * sizeof (*pkg_types);
850 memcpy (pkg_values, buffer, pkg_numval * sizeof (*pkg_values));
851 buffer += pkg_numval * sizeof (*pkg_values);
853 for (size_t i = 0; i < pkg_numval; i++)
855 switch (pkg_types[i])
857 case DS_TYPE_COUNTER:
858 pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter);
862 pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge);
866 pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive);
869 case DS_TYPE_ABSOLUTE:
870 pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute);
874 NOTICE ("network plugin: parse_part_values: "
875 "Don't know how to handle data source type %"PRIu8,
880 } /* switch (pkg_types[i]) */
883 *ret_buffer = buffer;
884 *ret_buffer_len = buffer_len - pkg_length;
885 *ret_num_values = pkg_numval;
886 *ret_values = pkg_values;
891 } /* int parse_part_values */
893 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
896 char *buffer = *ret_buffer;
897 size_t buffer_len = *ret_buffer_len;
901 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
905 if (buffer_len < exp_size)
907 WARNING ("network plugin: parse_part_number: "
909 "Chunk of size %zu expected, "
910 "but buffer has only %zu bytes left.",
911 exp_size, buffer_len);
915 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
916 buffer += sizeof (tmp16);
917 /* pkg_type = ntohs (tmp16); */
919 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
920 buffer += sizeof (tmp16);
921 pkg_length = ntohs (tmp16);
923 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
924 buffer += sizeof (tmp64);
925 *value = ntohll (tmp64);
927 *ret_buffer = buffer;
928 *ret_buffer_len = buffer_len - pkg_length;
931 } /* int parse_part_number */
933 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
934 char *output, size_t const output_len)
936 char *buffer = *ret_buffer;
937 size_t buffer_len = *ret_buffer_len;
940 size_t const header_size = 2 * sizeof (uint16_t);
948 if (buffer_len < header_size)
950 WARNING ("network plugin: parse_part_string: "
952 "Chunk of at least size %zu expected, "
953 "but buffer has only %zu bytes left.",
954 header_size, buffer_len);
958 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
959 buffer += sizeof (tmp16);
960 /* pkg_type = ntohs (tmp16); */
962 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
963 buffer += sizeof (tmp16);
964 pkg_length = ntohs (tmp16);
965 payload_size = ((size_t) pkg_length) - header_size;
967 /* Check that packet fits in the input buffer */
968 if (pkg_length > buffer_len)
970 WARNING ("network plugin: parse_part_string: "
972 "Chunk of size %"PRIu16" received, "
973 "but buffer has only %zu bytes left.",
974 pkg_length, buffer_len);
978 /* Check that pkg_length is in the valid range */
979 if (pkg_length <= header_size)
981 WARNING ("network plugin: parse_part_string: "
983 "Header claims this packet is only %hu "
984 "bytes long.", pkg_length);
988 /* Check that the package data fits into the output buffer.
989 * The previous if-statement ensures that:
990 * `pkg_length > header_size' */
991 if (output_len < payload_size)
993 WARNING ("network plugin: parse_part_string: "
995 "Output buffer holds %zu bytes, "
996 "which is too small to hold the received "
998 output_len, payload_size);
1002 /* All sanity checks successfull, let's copy the data over */
1003 memcpy ((void *) output, (void *) buffer, payload_size);
1004 buffer += payload_size;
1006 /* For some very weird reason '\0' doesn't do the trick on SPARC in
1007 * this statement. */
1008 if (output[payload_size - 1] != 0)
1010 WARNING ("network plugin: parse_part_string: "
1011 "Received string does not end "
1012 "with a NULL-byte.");
1016 *ret_buffer = buffer;
1017 *ret_buffer_len = buffer_len - pkg_length;
1020 } /* int parse_part_string */
1022 /* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call
1023 * parse_packet and vice versa. */
1024 #define PP_SIGNED 0x01
1025 #define PP_ENCRYPTED 0x02
1026 static int parse_packet (sockent_t *se,
1027 void *buffer, size_t buffer_size, int flags,
1028 const char *username);
1030 #define BUFFER_READ(p,s) do { \
1031 memcpy ((p), buffer + buffer_offset, (s)); \
1032 buffer_offset += (s); \
1036 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1037 void **ret_buffer, size_t *ret_buffer_len, int flags)
1039 static c_complain_t complain_no_users = C_COMPLAIN_INIT_STATIC;
1043 size_t buffer_offset;
1045 size_t username_len;
1048 part_signature_sha256_t pss;
1049 uint16_t pss_head_length;
1050 char hash[sizeof (pss.hash)];
1054 unsigned char *hash_ptr;
1056 buffer = *ret_buffer;
1057 buffer_len = *ret_buffer_len;
1060 if (se->data.server.userdb == NULL)
1062 c_complain (LOG_NOTICE, &complain_no_users,
1063 "network plugin: Received signed network packet but can't verify it "
1064 "because no user DB has been configured. Will accept it.");
1068 /* Check if the buffer has enough data for this structure. */
1069 if (buffer_len <= PART_SIGNATURE_SHA256_SIZE)
1072 /* Read type and length header */
1073 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1074 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1075 pss_head_length = ntohs (pss.head.length);
1077 /* Check if the `pss_head_length' is within bounds. */
1078 if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE)
1079 || (pss_head_length > buffer_len))
1081 ERROR ("network plugin: HMAC-SHA-256 with invalid length received.");
1085 /* Copy the hash. */
1086 BUFFER_READ (pss.hash, sizeof (pss.hash));
1088 /* Calculate username length (without null byte) and allocate memory */
1089 username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE;
1090 pss.username = malloc (username_len + 1);
1091 if (pss.username == NULL)
1094 /* Read the username */
1095 BUFFER_READ (pss.username, username_len);
1096 pss.username[username_len] = 0;
1098 assert (buffer_offset == pss_head_length);
1100 /* Query the password */
1101 secret = fbh_get (se->data.server.userdb, pss.username);
1104 ERROR ("network plugin: Unknown user: %s", pss.username);
1105 sfree (pss.username);
1109 /* Create a hash device and check the HMAC */
1111 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
1114 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
1115 gcry_strerror (err));
1117 sfree (pss.username);
1121 err = gcry_md_setkey (hd, secret, strlen (secret));
1124 ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err));
1127 sfree (pss.username);
1132 buffer + PART_SIGNATURE_SHA256_SIZE,
1133 buffer_len - PART_SIGNATURE_SHA256_SIZE);
1134 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
1135 if (hash_ptr == NULL)
1137 ERROR ("network plugin: gcry_md_read failed.");
1140 sfree (pss.username);
1143 memcpy (hash, hash_ptr, sizeof (hash));
1149 if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0)
1151 WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: "
1152 "Hash mismatch. Username: %s", pss.username);
1156 parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset,
1157 flags | PP_SIGNED, pss.username);
1161 sfree (pss.username);
1163 *ret_buffer = buffer + buffer_len;
1164 *ret_buffer_len = 0;
1167 } /* }}} int parse_part_sign_sha256 */
1168 /* #endif HAVE_LIBGCRYPT */
1170 #else /* if !HAVE_LIBGCRYPT */
1171 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1172 void **ret_buffer, size_t *ret_buffer_size, int flags)
1174 static int warning_has_been_printed = 0;
1178 size_t buffer_offset;
1181 part_signature_sha256_t pss;
1183 buffer = *ret_buffer;
1184 buffer_size = *ret_buffer_size;
1187 if (buffer_size <= PART_SIGNATURE_SHA256_SIZE)
1190 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1191 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1192 part_len = ntohs (pss.head.length);
1194 if ((part_len <= PART_SIGNATURE_SHA256_SIZE)
1195 || (part_len > buffer_size))
1198 if (warning_has_been_printed == 0)
1200 WARNING ("network plugin: Received signed packet, but the network "
1201 "plugin was not linked with libgcrypt, so I cannot "
1202 "verify the signature. The packet will be accepted.");
1203 warning_has_been_printed = 1;
1206 parse_packet (se, buffer + part_len, buffer_size - part_len, flags,
1207 /* username = */ NULL);
1209 *ret_buffer = buffer + buffer_size;
1210 *ret_buffer_size = 0;
1213 } /* }}} int parse_part_sign_sha256 */
1214 #endif /* !HAVE_LIBGCRYPT */
1217 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1218 void **ret_buffer, size_t *ret_buffer_len,
1221 char *buffer = *ret_buffer;
1222 size_t buffer_len = *ret_buffer_len;
1225 size_t buffer_offset;
1226 uint16_t username_len;
1227 part_encryption_aes256_t pea;
1228 unsigned char hash[sizeof (pea.hash)] = { 0 };
1230 gcry_cipher_hd_t cypher;
1233 /* Make sure at least the header if available. */
1234 if (buffer_len <= PART_ENCRYPTION_AES256_SIZE)
1236 NOTICE ("network plugin: parse_part_encr_aes256: "
1237 "Discarding short packet.");
1243 /* Copy the unencrypted information into `pea'. */
1244 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
1245 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
1247 /* Check the `part size'. */
1248 part_size = ntohs (pea.head.length);
1249 if ((part_size <= PART_ENCRYPTION_AES256_SIZE)
1250 || (part_size > buffer_len))
1252 NOTICE ("network plugin: parse_part_encr_aes256: "
1253 "Discarding part with invalid size.");
1257 /* Read the username */
1258 BUFFER_READ (&username_len, sizeof (username_len));
1259 username_len = ntohs (username_len);
1261 if ((username_len == 0)
1262 || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1))))
1264 NOTICE ("network plugin: parse_part_encr_aes256: "
1265 "Discarding part with invalid username length.");
1269 assert (username_len > 0);
1270 pea.username = malloc (username_len + 1);
1271 if (pea.username == NULL)
1273 BUFFER_READ (pea.username, username_len);
1274 pea.username[username_len] = 0;
1276 /* Last but not least, the initialization vector */
1277 BUFFER_READ (pea.iv, sizeof (pea.iv));
1279 /* Make sure we are at the right position */
1280 assert (buffer_offset == (username_len +
1281 PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash)));
1283 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
1287 ERROR ("network plugin: Failed to get cypher. Username: %s", pea.username);
1288 sfree (pea.username);
1292 payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len);
1293 assert (payload_len > 0);
1295 /* Decrypt the packet in-place */
1296 err = gcry_cipher_decrypt (cypher,
1297 buffer + buffer_offset,
1298 part_size - buffer_offset,
1299 /* in = */ NULL, /* in len = */ 0);
1302 sfree (pea.username);
1303 ERROR ("network plugin: gcry_cipher_decrypt returned: %s. Username: %s",
1304 gcry_strerror (err), pea.username);
1309 BUFFER_READ (pea.hash, sizeof (pea.hash));
1311 /* Make sure we're at the right position - again */
1312 assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE));
1313 assert (buffer_offset == (part_size - payload_len));
1315 /* Check hash sum */
1316 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
1317 buffer + buffer_offset, payload_len);
1318 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
1320 ERROR ("network plugin: Checksum mismatch. Username: %s", pea.username);
1321 sfree (pea.username);
1325 parse_packet (se, buffer + buffer_offset, payload_len,
1326 flags | PP_ENCRYPTED, pea.username);
1328 /* XXX: Free pea.username?!? */
1330 /* Update return values */
1331 *ret_buffer = buffer + part_size;
1332 *ret_buffer_len = buffer_len - part_size;
1334 sfree (pea.username);
1337 } /* }}} int parse_part_encr_aes256 */
1338 /* #endif HAVE_LIBGCRYPT */
1340 #else /* if !HAVE_LIBGCRYPT */
1341 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1342 void **ret_buffer, size_t *ret_buffer_size, int flags)
1344 static int warning_has_been_printed = 0;
1348 size_t buffer_offset;
1353 buffer = *ret_buffer;
1354 buffer_size = *ret_buffer_size;
1357 /* parse_packet assures this minimum size. */
1358 assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length)));
1360 BUFFER_READ (&ph.type, sizeof (ph.type));
1361 BUFFER_READ (&ph.length, sizeof (ph.length));
1362 ph_length = ntohs (ph.length);
1364 if ((ph_length <= PART_ENCRYPTION_AES256_SIZE)
1365 || (ph_length > buffer_size))
1367 ERROR ("network plugin: AES-256 encrypted part "
1368 "with invalid length received.");
1372 if (warning_has_been_printed == 0)
1374 WARNING ("network plugin: Received encrypted packet, but the network "
1375 "plugin was not linked with libgcrypt, so I cannot "
1376 "decrypt it. The part will be discarded.");
1377 warning_has_been_printed = 1;
1380 *ret_buffer = (void *) (((char *) *ret_buffer) + ph_length);
1381 *ret_buffer_size -= ph_length;
1384 } /* }}} int parse_part_encr_aes256 */
1385 #endif /* !HAVE_LIBGCRYPT */
1389 static int parse_packet (sockent_t *se, /* {{{ */
1390 void *buffer, size_t buffer_size, int flags,
1391 const char *username)
1395 value_list_t vl = VALUE_LIST_INIT;
1396 notification_t n = { 0 };
1399 int packet_was_signed = (flags & PP_SIGNED);
1400 int packet_was_encrypted = (flags & PP_ENCRYPTED);
1401 int printed_ignore_warning = 0;
1402 #endif /* HAVE_LIBGCRYPT */
1405 memset (&vl, '\0', sizeof (vl));
1408 while ((status == 0) && (0 < buffer_size)
1409 && ((unsigned int) buffer_size > sizeof (part_header_t)))
1411 uint16_t pkg_length;
1414 memcpy ((void *) &pkg_type,
1417 memcpy ((void *) &pkg_length,
1418 (void *) (((char *) buffer) + sizeof (pkg_type)),
1419 sizeof (pkg_length));
1421 pkg_length = ntohs (pkg_length);
1422 pkg_type = ntohs (pkg_type);
1424 if (pkg_length > buffer_size)
1426 /* Ensure that this loop terminates eventually */
1427 if (pkg_length < (2 * sizeof (uint16_t)))
1430 if (pkg_type == TYPE_ENCR_AES256)
1432 status = parse_part_encr_aes256 (se,
1433 &buffer, &buffer_size, flags);
1436 ERROR ("network plugin: Decrypting AES256 "
1438 "with status %i.", status);
1443 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
1444 && (packet_was_encrypted == 0))
1446 if (printed_ignore_warning == 0)
1448 INFO ("network plugin: Unencrypted packet or "
1449 "part has been ignored.");
1450 printed_ignore_warning = 1;
1452 buffer = ((char *) buffer) + pkg_length;
1453 buffer_size -= (size_t) pkg_length;
1456 #endif /* HAVE_LIBGCRYPT */
1457 else if (pkg_type == TYPE_SIGN_SHA256)
1459 status = parse_part_sign_sha256 (se,
1460 &buffer, &buffer_size, flags);
1463 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1465 "with status %i.", status);
1470 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
1471 && (packet_was_encrypted == 0)
1472 && (packet_was_signed == 0))
1474 if (printed_ignore_warning == 0)
1476 INFO ("network plugin: Unsigned packet or "
1477 "part has been ignored.");
1478 printed_ignore_warning = 1;
1480 buffer = ((char *) buffer) + pkg_length;
1481 buffer_size -= (size_t) pkg_length;
1484 #endif /* HAVE_LIBGCRYPT */
1485 else if (pkg_type == TYPE_VALUES)
1487 status = parse_part_values (&buffer, &buffer_size,
1488 &vl.values, &vl.values_len);
1492 network_dispatch_values (&vl, username);
1496 else if (pkg_type == TYPE_TIME)
1499 status = parse_part_number (&buffer, &buffer_size,
1503 vl.time = TIME_T_TO_CDTIME_T (tmp);
1504 n.time = TIME_T_TO_CDTIME_T (tmp);
1507 else if (pkg_type == TYPE_TIME_HR)
1510 status = parse_part_number (&buffer, &buffer_size,
1514 vl.time = (cdtime_t) tmp;
1515 n.time = (cdtime_t) tmp;
1518 else if (pkg_type == TYPE_INTERVAL)
1521 status = parse_part_number (&buffer, &buffer_size,
1524 vl.interval = TIME_T_TO_CDTIME_T (tmp);
1526 else if (pkg_type == TYPE_INTERVAL_HR)
1529 status = parse_part_number (&buffer, &buffer_size,
1532 vl.interval = (cdtime_t) tmp;
1534 else if (pkg_type == TYPE_HOST)
1536 status = parse_part_string (&buffer, &buffer_size,
1537 vl.host, sizeof (vl.host));
1539 sstrncpy (n.host, vl.host, sizeof (n.host));
1541 else if (pkg_type == TYPE_PLUGIN)
1543 status = parse_part_string (&buffer, &buffer_size,
1544 vl.plugin, sizeof (vl.plugin));
1546 sstrncpy (n.plugin, vl.plugin,
1549 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1551 status = parse_part_string (&buffer, &buffer_size,
1553 sizeof (vl.plugin_instance));
1555 sstrncpy (n.plugin_instance,
1557 sizeof (n.plugin_instance));
1559 else if (pkg_type == TYPE_TYPE)
1561 status = parse_part_string (&buffer, &buffer_size,
1562 vl.type, sizeof (vl.type));
1564 sstrncpy (n.type, vl.type, sizeof (n.type));
1566 else if (pkg_type == TYPE_TYPE_INSTANCE)
1568 status = parse_part_string (&buffer, &buffer_size,
1570 sizeof (vl.type_instance));
1572 sstrncpy (n.type_instance, vl.type_instance,
1573 sizeof (n.type_instance));
1575 else if (pkg_type == TYPE_MESSAGE)
1577 status = parse_part_string (&buffer, &buffer_size,
1578 n.message, sizeof (n.message));
1584 else if ((n.severity != NOTIF_FAILURE)
1585 && (n.severity != NOTIF_WARNING)
1586 && (n.severity != NOTIF_OKAY))
1588 INFO ("network plugin: "
1589 "Ignoring notification with "
1590 "unknown severity %i.",
1593 else if (n.time == 0)
1595 INFO ("network plugin: "
1596 "Ignoring notification with "
1599 else if (strlen (n.message) == 0)
1601 INFO ("network plugin: "
1602 "Ignoring notification with "
1603 "an empty message.");
1607 network_dispatch_notification (&n);
1610 else if (pkg_type == TYPE_SEVERITY)
1613 status = parse_part_number (&buffer, &buffer_size,
1616 n.severity = (int) tmp;
1620 DEBUG ("network plugin: parse_packet: Unknown part"
1621 " type: 0x%04hx", pkg_type);
1622 buffer = ((char *) buffer) + pkg_length;
1623 buffer_size -= (size_t) pkg_length;
1625 } /* while (buffer_size > sizeof (part_header_t)) */
1627 if (status == 0 && buffer_size > 0)
1628 WARNING ("network plugin: parse_packet: Received truncated "
1629 "packet, try increasing `MaxPacketSize'");
1632 } /* }}} int parse_packet */
1634 static void free_sockent_client (struct sockent_client *sec) /* {{{ */
1643 sfree (sec->username);
1644 sfree (sec->password);
1645 if (sec->cypher != NULL)
1646 gcry_cipher_close (sec->cypher);
1648 } /* }}} void free_sockent_client */
1650 static void free_sockent_server (struct sockent_server *ses) /* {{{ */
1652 for (size_t i = 0; i < ses->fd_num; i++)
1654 if (ses->fd[i] >= 0)
1663 sfree (ses->auth_file);
1664 fbh_destroy (ses->userdb);
1665 if (ses->cypher != NULL)
1666 gcry_cipher_close (ses->cypher);
1668 } /* }}} void free_sockent_server */
1670 static void sockent_destroy (sockent_t *se) /* {{{ */
1674 DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se);
1681 sfree (se->service);
1683 if (se->type == SOCKENT_TYPE_CLIENT)
1684 free_sockent_client (&se->data.client);
1686 free_sockent_server (&se->data.server);
1691 } /* }}} void sockent_destroy */
1694 * int network_set_ttl
1696 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1697 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1699 * The `struct addrinfo' is used to destinguish between unicast and multicast
1702 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1704 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1705 network_config_ttl);
1707 assert (se->type == SOCKENT_TYPE_CLIENT);
1709 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1712 if (ai->ai_family == AF_INET)
1714 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1717 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1718 optname = IP_MULTICAST_TTL;
1722 if (setsockopt (se->data.client.fd, IPPROTO_IP, optname,
1723 &network_config_ttl,
1724 sizeof (network_config_ttl)) != 0)
1727 ERROR ("network plugin: setsockopt (ipv4-ttl): %s",
1728 sstrerror (errno, errbuf, sizeof (errbuf)));
1732 else if (ai->ai_family == AF_INET6)
1734 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1735 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1738 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1739 optname = IPV6_MULTICAST_HOPS;
1741 optname = IPV6_UNICAST_HOPS;
1743 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname,
1744 &network_config_ttl,
1745 sizeof (network_config_ttl)) != 0)
1748 ERROR ("network plugin: setsockopt(ipv6-ttl): %s",
1749 sstrerror (errno, errbuf,
1756 } /* int network_set_ttl */
1758 static int network_set_interface (const sockent_t *se, const struct addrinfo *ai) /* {{{ */
1760 DEBUG ("network plugin: network_set_interface: interface index = %i;",
1763 assert (se->type == SOCKENT_TYPE_CLIENT);
1765 if (ai->ai_family == AF_INET)
1767 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1769 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1771 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1772 /* If possible, use the "ip_mreqn" structure which has
1773 * an "interface index" member. Using the interface
1774 * index is preferred here, because of its similarity
1775 * to the way IPv6 handles this. Unfortunately, it
1776 * appears not to be portable. */
1777 struct ip_mreqn mreq = {
1778 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
1779 .imr_address.s_addr = ntohl (INADDR_ANY),
1780 .imr_ifindex = se->interface
1783 struct ip_mreq mreq = {
1784 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
1785 .imr_interface.s_addr = ntohl (INADDR_ANY)
1789 if (setsockopt (se->data.client.fd, IPPROTO_IP, IP_MULTICAST_IF,
1790 &mreq, sizeof (mreq)) != 0)
1793 ERROR ("network plugin: setsockopt (ipv4-multicast-if): %s",
1794 sstrerror (errno, errbuf, sizeof (errbuf)));
1801 else if (ai->ai_family == AF_INET6)
1803 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1805 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1807 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
1809 sizeof (se->interface)) != 0)
1812 ERROR ("network plugin: setsockopt (ipv6-multicast-if): %s",
1813 sstrerror (errno, errbuf,
1822 /* else: Not a multicast interface. */
1823 if (se->interface != 0)
1825 #if defined(HAVE_IF_INDEXTONAME) && HAVE_IF_INDEXTONAME && defined(SO_BINDTODEVICE)
1826 char interface_name[IFNAMSIZ];
1828 if (if_indextoname (se->interface, interface_name) == NULL)
1831 DEBUG ("network plugin: Binding socket to interface %s", interface_name);
1833 if (setsockopt (se->data.client.fd, SOL_SOCKET, SO_BINDTODEVICE,
1835 sizeof(interface_name)) == -1 )
1838 ERROR ("network plugin: setsockopt (bind-if): %s",
1839 sstrerror (errno, errbuf, sizeof (errbuf)));
1842 /* #endif HAVE_IF_INDEXTONAME && SO_BINDTODEVICE */
1845 WARNING ("network plugin: Cannot set the interface on a unicast "
1847 # if !defined(SO_BINDTODEVICE)
1848 "the \"SO_BINDTODEVICE\" socket option "
1850 "the \"if_indextoname\" function "
1852 "is not available on your system.");
1858 } /* }}} network_set_interface */
1860 static int network_bind_socket (int fd, const struct addrinfo *ai, const int interface_idx)
1869 /* allow multiple sockets to use the same PORT number */
1870 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
1871 &yes, sizeof(yes)) == -1) {
1873 ERROR ("network plugin: setsockopt (reuseaddr): %s",
1874 sstrerror (errno, errbuf, sizeof (errbuf)));
1878 DEBUG ("fd = %i; calling `bind'", fd);
1880 if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1)
1884 sstrerror (errno, errbuf, sizeof (errbuf)));
1888 if (ai->ai_family == AF_INET)
1890 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1891 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1893 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1894 struct ip_mreqn mreq;
1896 struct ip_mreq mreq;
1899 DEBUG ("fd = %i; IPv4 multicast address found", fd);
1901 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1902 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1903 /* Set the interface using the interface index if
1904 * possible (available). Unfortunately, the struct
1905 * ip_mreqn is not portable. */
1906 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
1907 mreq.imr_ifindex = interface_idx;
1909 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
1912 if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1913 &loop, sizeof (loop)) == -1)
1916 ERROR ("network plugin: setsockopt (multicast-loop): %s",
1917 sstrerror (errno, errbuf,
1922 if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1923 &mreq, sizeof (mreq)) == -1)
1926 ERROR ("network plugin: setsockopt (add-membership): %s",
1927 sstrerror (errno, errbuf,
1935 else if (ai->ai_family == AF_INET6)
1937 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1938 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1939 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1941 struct ipv6_mreq mreq;
1943 DEBUG ("fd = %i; IPv6 multicast address found", fd);
1945 memcpy (&mreq.ipv6mr_multiaddr,
1947 sizeof (addr->sin6_addr));
1949 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1950 * ipv6mr_interface may be set to zeroes to
1951 * choose the default multicast interface or to
1952 * the index of a particular multicast-capable
1953 * interface if the host is multihomed.
1954 * Membership is associ-associated with a
1955 * single interface; programs running on
1956 * multihomed hosts may need to join the same
1957 * group on more than one interface.*/
1958 mreq.ipv6mr_interface = interface_idx;
1960 if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1961 &loop, sizeof (loop)) == -1)
1964 ERROR ("network plugin: setsockopt (ipv6-multicast-loop): %s",
1965 sstrerror (errno, errbuf,
1970 if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1971 &mreq, sizeof (mreq)) == -1)
1974 ERROR ("network plugin: setsockopt (ipv6-add-membership): %s",
1975 sstrerror (errno, errbuf,
1984 #if defined(HAVE_IF_INDEXTONAME) && HAVE_IF_INDEXTONAME && defined(SO_BINDTODEVICE)
1985 /* if a specific interface was set, bind the socket to it. But to avoid
1986 * possible problems with multicast routing, only do that for non-multicast
1988 if (interface_idx != 0)
1990 char interface_name[IFNAMSIZ];
1992 if (if_indextoname (interface_idx, interface_name) == NULL)
1995 DEBUG ("fd = %i; Binding socket to interface %s", fd, interface_name);
1997 if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
1999 sizeof(interface_name)) == -1 )
2002 ERROR ("network plugin: setsockopt (bind-if): %s",
2003 sstrerror (errno, errbuf, sizeof (errbuf)));
2007 #endif /* HAVE_IF_INDEXTONAME && SO_BINDTODEVICE */
2010 } /* int network_bind_socket */
2012 /* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT'
2013 * or `SOCKENT_TYPE_SERVER' */
2014 static sockent_t *sockent_create (int type) /* {{{ */
2018 if ((type != SOCKENT_TYPE_CLIENT) && (type != SOCKENT_TYPE_SERVER))
2021 se = calloc (1, sizeof (*se));
2031 if (type == SOCKENT_TYPE_SERVER)
2033 se->data.server.fd = NULL;
2034 se->data.server.fd_num = 0;
2036 se->data.server.security_level = SECURITY_LEVEL_NONE;
2037 se->data.server.auth_file = NULL;
2038 se->data.server.userdb = NULL;
2039 se->data.server.cypher = NULL;
2044 se->data.client.fd = -1;
2045 se->data.client.addr = NULL;
2046 se->data.client.resolve_interval = 0;
2047 se->data.client.next_resolve_reconnect = 0;
2049 se->data.client.security_level = SECURITY_LEVEL_NONE;
2050 se->data.client.username = NULL;
2051 se->data.client.password = NULL;
2052 se->data.client.cypher = NULL;
2057 } /* }}} sockent_t *sockent_create */
2059 static int sockent_init_crypto (sockent_t *se) /* {{{ */
2061 #if HAVE_LIBGCRYPT /* {{{ */
2062 if (se->type == SOCKENT_TYPE_CLIENT)
2064 if (se->data.client.security_level > SECURITY_LEVEL_NONE)
2066 if (network_init_gcrypt () < 0)
2068 ERROR ("network plugin: Cannot configure client socket with "
2069 "security: Failed to initialize crypto library.");
2073 if ((se->data.client.username == NULL)
2074 || (se->data.client.password == NULL))
2076 ERROR ("network plugin: Client socket with "
2077 "security requested, but no "
2078 "credentials are configured.");
2081 gcry_md_hash_buffer (GCRY_MD_SHA256,
2082 se->data.client.password_hash,
2083 se->data.client.password,
2084 strlen (se->data.client.password));
2087 else /* (se->type == SOCKENT_TYPE_SERVER) */
2089 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
2091 if (network_init_gcrypt () < 0)
2093 ERROR ("network plugin: Cannot configure server socket with "
2094 "security: Failed to initialize crypto library.");
2098 if (se->data.server.auth_file == NULL)
2100 ERROR ("network plugin: Server socket with "
2101 "security requested, but no "
2102 "password file is configured.");
2106 if (se->data.server.auth_file != NULL)
2108 se->data.server.userdb = fbh_create (se->data.server.auth_file);
2109 if (se->data.server.userdb == NULL)
2111 ERROR ("network plugin: Reading password file "
2113 se->data.server.auth_file);
2114 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
2119 #endif /* }}} HAVE_LIBGCRYPT */
2122 } /* }}} int sockent_init_crypto */
2124 static int sockent_client_disconnect (sockent_t *se) /* {{{ */
2126 struct sockent_client *client;
2128 if ((se == NULL) || (se->type != SOCKENT_TYPE_CLIENT))
2131 client = &se->data.client;
2132 if (client->fd >= 0) /* connected */
2138 sfree (client->addr);
2139 client->addrlen = 0;
2142 } /* }}} int sockent_client_disconnect */
2144 static int sockent_client_connect (sockent_t *se) /* {{{ */
2146 static c_complain_t complaint = C_COMPLAIN_INIT_STATIC;
2148 struct sockent_client *client;
2149 struct addrinfo *ai_list;
2151 _Bool reconnect = 0;
2154 if ((se == NULL) || (se->type != SOCKENT_TYPE_CLIENT))
2157 client = &se->data.client;
2160 if (client->resolve_interval != 0 && client->next_resolve_reconnect < now) {
2161 DEBUG("network plugin: Reconnecting socket, resolve_interval = %lf, next_resolve_reconnect = %lf",
2162 CDTIME_T_TO_DOUBLE(client->resolve_interval), CDTIME_T_TO_DOUBLE(client->next_resolve_reconnect));
2166 if (client->fd >= 0 && !reconnect) /* already connected and not stale*/
2169 struct addrinfo ai_hints = {
2170 .ai_family = AF_UNSPEC,
2171 .ai_flags = AI_ADDRCONFIG,
2172 .ai_protocol = IPPROTO_UDP,
2173 .ai_socktype = SOCK_DGRAM
2176 status = getaddrinfo (se->node,
2177 (se->service != NULL) ? se->service : NET_DEFAULT_PORT,
2178 &ai_hints, &ai_list);
2181 c_complain (LOG_ERR, &complaint,
2182 "network plugin: getaddrinfo (%s, %s) failed: %s",
2183 (se->node == NULL) ? "(null)" : se->node,
2184 (se->service == NULL) ? "(null)" : se->service,
2185 gai_strerror (status));
2190 c_release (LOG_NOTICE, &complaint,
2191 "network plugin: Successfully resolved \"%s\".",
2195 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2197 if (client->fd >= 0) /* when we reconnect */
2198 sockent_client_disconnect(se);
2200 client->fd = socket (ai_ptr->ai_family,
2201 ai_ptr->ai_socktype,
2202 ai_ptr->ai_protocol);
2206 ERROR ("network plugin: socket(2) failed: %s",
2207 sstrerror (errno, errbuf,
2212 client->addr = calloc (1, sizeof (*client->addr));
2213 if (client->addr == NULL)
2215 ERROR ("network plugin: calloc failed.");
2221 assert (sizeof (*client->addr) >= ai_ptr->ai_addrlen);
2222 memcpy (client->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
2223 client->addrlen = ai_ptr->ai_addrlen;
2225 network_set_ttl (se, ai_ptr);
2226 network_set_interface (se, ai_ptr);
2228 /* We don't open more than one write-socket per
2229 * node/service pair.. */
2233 freeaddrinfo (ai_list);
2237 if (client->resolve_interval > 0)
2238 client->next_resolve_reconnect = now + client->resolve_interval;
2240 } /* }}} int sockent_client_connect */
2242 /* Open the file descriptors for a initialized sockent structure. */
2243 static int sockent_server_listen (sockent_t *se) /* {{{ */
2245 struct addrinfo *ai_list;
2249 const char *service;
2254 assert (se->data.server.fd == NULL);
2255 assert (se->data.server.fd_num == 0);
2258 service = se->service;
2260 if (service == NULL)
2261 service = NET_DEFAULT_PORT;
2263 DEBUG ("network plugin: sockent_server_listen: node = %s; service = %s;",
2266 struct addrinfo ai_hints = {
2267 .ai_family = AF_UNSPEC,
2268 .ai_flags = AI_ADDRCONFIG | AI_PASSIVE,
2269 .ai_protocol = IPPROTO_UDP,
2270 .ai_socktype = SOCK_DGRAM
2273 status = getaddrinfo (node, service, &ai_hints, &ai_list);
2276 ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s",
2277 (se->node == NULL) ? "(null)" : se->node,
2278 (se->service == NULL) ? "(null)" : se->service,
2279 gai_strerror (status));
2283 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2287 tmp = realloc (se->data.server.fd,
2288 sizeof (*tmp) * (se->data.server.fd_num + 1));
2291 ERROR ("network plugin: realloc failed.");
2294 se->data.server.fd = tmp;
2295 tmp = se->data.server.fd + se->data.server.fd_num;
2297 *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
2298 ai_ptr->ai_protocol);
2302 ERROR ("network plugin: socket(2) failed: %s",
2303 sstrerror (errno, errbuf,
2308 status = network_bind_socket (*tmp, ai_ptr, se->interface);
2316 se->data.server.fd_num++;
2318 } /* for (ai_list) */
2320 freeaddrinfo (ai_list);
2322 if (se->data.server.fd_num == 0)
2325 } /* }}} int sockent_server_listen */
2327 /* Add a sockent to the global list of sockets */
2328 static int sockent_add (sockent_t *se) /* {{{ */
2330 sockent_t *last_ptr;
2335 if (se->type == SOCKENT_TYPE_SERVER)
2339 tmp = realloc (listen_sockets_pollfd,
2340 sizeof (*tmp) * (listen_sockets_num
2341 + se->data.server.fd_num));
2344 ERROR ("network plugin: realloc failed.");
2347 listen_sockets_pollfd = tmp;
2348 tmp = listen_sockets_pollfd + listen_sockets_num;
2350 for (size_t i = 0; i < se->data.server.fd_num; i++)
2352 memset (tmp + i, 0, sizeof (*tmp));
2353 tmp[i].fd = se->data.server.fd[i];
2354 tmp[i].events = POLLIN | POLLPRI;
2358 listen_sockets_num += se->data.server.fd_num;
2360 if (listen_sockets == NULL)
2362 listen_sockets = se;
2365 last_ptr = listen_sockets;
2367 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
2369 if (sending_sockets == NULL)
2371 sending_sockets = se;
2374 last_ptr = sending_sockets;
2377 while (last_ptr->next != NULL)
2378 last_ptr = last_ptr->next;
2379 last_ptr->next = se;
2382 } /* }}} int sockent_add */
2384 static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */
2388 receive_list_entry_t *ent;
2391 /* Lock and wait for more data to come in */
2392 pthread_mutex_lock (&receive_list_lock);
2393 while ((listen_loop == 0)
2394 && (receive_list_head == NULL))
2395 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
2397 /* Remove the head entry and unlock */
2398 ent = receive_list_head;
2400 receive_list_head = ent->next;
2401 receive_list_length--;
2402 pthread_mutex_unlock (&receive_list_lock);
2404 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
2405 * because we dispatch all missing packets before shutting down. */
2409 /* Look for the correct `sockent_t' */
2410 se = listen_sockets;
2415 for (i = 0; i < se->data.server.fd_num; i++)
2416 if (se->data.server.fd[i] == ent->fd)
2419 if (i < se->data.server.fd_num)
2427 ERROR ("network plugin: Got packet from FD %i, but can't "
2428 "find an appropriate socket entry.",
2435 parse_packet (se, ent->data, ent->data_len, /* flags = */ 0,
2436 /* username = */ NULL);
2442 } /* }}} void *dispatch_thread */
2444 static int network_receive (void) /* {{{ */
2446 char buffer[network_config_packet_size];
2451 receive_list_entry_t *private_list_head;
2452 receive_list_entry_t *private_list_tail;
2453 uint64_t private_list_length;
2455 assert (listen_sockets_num > 0);
2457 private_list_head = NULL;
2458 private_list_tail = NULL;
2459 private_list_length = 0;
2461 while (listen_loop == 0)
2463 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
2469 ERROR ("network plugin: poll(2) failed: %s",
2470 sstrerror (errno, errbuf, sizeof (errbuf)));
2474 for (size_t i = 0; (i < listen_sockets_num) && (status > 0); i++)
2476 receive_list_entry_t *ent;
2478 if ((listen_sockets_pollfd[i].revents
2479 & (POLLIN | POLLPRI)) == 0)
2483 buffer_len = recv (listen_sockets_pollfd[i].fd,
2484 buffer, sizeof (buffer),
2489 status = (errno != 0) ? errno : -1;
2490 ERROR ("network plugin: recv(2) failed: %s",
2491 sstrerror (errno, errbuf, sizeof (errbuf)));
2495 stats_octets_rx += ((uint64_t) buffer_len);
2498 /* TODO: Possible performance enhancement: Do not free
2499 * these entries in the dispatch thread but put them in
2500 * another list, so we don't have to allocate more and
2501 * more of these structures. */
2502 ent = calloc (1, sizeof (*ent));
2505 ERROR ("network plugin: calloc failed.");
2510 ent->data = malloc (network_config_packet_size);
2511 if (ent->data == NULL)
2514 ERROR ("network plugin: malloc failed.");
2518 ent->fd = listen_sockets_pollfd[i].fd;
2521 memcpy (ent->data, buffer, buffer_len);
2522 ent->data_len = buffer_len;
2524 if (private_list_head == NULL)
2525 private_list_head = ent;
2527 private_list_tail->next = ent;
2528 private_list_tail = ent;
2529 private_list_length++;
2531 /* Do not block here. Blocking here has led to
2532 * insufficient performance in the past. */
2533 if (pthread_mutex_trylock (&receive_list_lock) == 0)
2535 assert (((receive_list_head == NULL) && (receive_list_length == 0))
2536 || ((receive_list_head != NULL) && (receive_list_length != 0)));
2538 if (receive_list_head == NULL)
2539 receive_list_head = private_list_head;
2541 receive_list_tail->next = private_list_head;
2542 receive_list_tail = private_list_tail;
2543 receive_list_length += private_list_length;
2545 pthread_cond_signal (&receive_list_cond);
2546 pthread_mutex_unlock (&receive_list_lock);
2548 private_list_head = NULL;
2549 private_list_tail = NULL;
2550 private_list_length = 0;
2554 } /* for (listen_sockets_pollfd) */
2558 } /* while (listen_loop == 0) */
2560 /* Make sure everything is dispatched before exiting. */
2561 if (private_list_head != NULL)
2563 pthread_mutex_lock (&receive_list_lock);
2565 if (receive_list_head == NULL)
2566 receive_list_head = private_list_head;
2568 receive_list_tail->next = private_list_head;
2569 receive_list_tail = private_list_tail;
2570 receive_list_length += private_list_length;
2572 pthread_cond_signal (&receive_list_cond);
2573 pthread_mutex_unlock (&receive_list_lock);
2577 } /* }}} int network_receive */
2579 static void *receive_thread (void __attribute__((unused)) *arg)
2581 return (network_receive () ? (void *) 1 : (void *) 0);
2582 } /* void *receive_thread */
2584 static void network_init_buffer (void)
2586 memset (send_buffer, 0, network_config_packet_size);
2587 send_buffer_ptr = send_buffer;
2588 send_buffer_fill = 0;
2589 send_buffer_last_update = 0;
2591 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
2592 } /* int network_init_buffer */
2594 static void network_send_buffer_plain (sockent_t *se, /* {{{ */
2595 const char *buffer, size_t buffer_size)
2601 status = sockent_client_connect (se);
2605 status = sendto (se->data.client.fd, buffer, buffer_size,
2607 (struct sockaddr *) se->data.client.addr,
2608 se->data.client.addrlen);
2613 if ((errno == EINTR) || (errno == EAGAIN))
2616 ERROR ("network plugin: sendto failed: %s. Closing sending socket.",
2617 sstrerror (errno, errbuf, sizeof (errbuf)));
2618 sockent_client_disconnect (se);
2624 } /* }}} void network_send_buffer_plain */
2627 #define BUFFER_ADD(p,s) do { \
2628 memcpy (buffer + buffer_offset, (p), (s)); \
2629 buffer_offset += (s); \
2632 static void network_send_buffer_signed (sockent_t *se, /* {{{ */
2633 const char *in_buffer, size_t in_buffer_size)
2635 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2636 size_t buffer_offset;
2637 size_t username_len;
2641 unsigned char *hash;
2644 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
2647 ERROR ("network plugin: Creating HMAC object failed: %s",
2648 gcry_strerror (err));
2652 err = gcry_md_setkey (hd, se->data.client.password,
2653 strlen (se->data.client.password));
2656 ERROR ("network plugin: gcry_md_setkey failed: %s",
2657 gcry_strerror (err));
2662 username_len = strlen (se->data.client.username);
2663 if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE))
2665 ERROR ("network plugin: Username too long: %s",
2666 se->data.client.username);
2670 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE,
2671 se->data.client.username, username_len);
2672 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len,
2673 in_buffer, in_buffer_size);
2675 /* Initialize the `ps' structure. */
2676 part_signature_sha256_t ps = {
2677 .head.type = htons (TYPE_SIGN_SHA256),
2678 .head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len)
2681 /* Calculate the hash value. */
2682 gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE,
2683 username_len + in_buffer_size);
2684 hash = gcry_md_read (hd, GCRY_MD_SHA256);
2687 ERROR ("network plugin: gcry_md_read failed.");
2691 memcpy (ps.hash, hash, sizeof (ps.hash));
2693 /* Add the header */
2696 BUFFER_ADD (&ps.head.type, sizeof (ps.head.type));
2697 BUFFER_ADD (&ps.head.length, sizeof (ps.head.length));
2698 BUFFER_ADD (ps.hash, sizeof (ps.hash));
2700 assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE);
2705 buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size;
2706 network_send_buffer_plain (se, buffer, buffer_offset);
2707 } /* }}} void network_send_buffer_signed */
2709 static void network_send_buffer_encrypted (sockent_t *se, /* {{{ */
2710 const char *in_buffer, size_t in_buffer_size)
2712 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2714 size_t buffer_offset;
2716 size_t username_len;
2718 gcry_cipher_hd_t cypher;
2720 /* Initialize the header fields */
2721 part_encryption_aes256_t pea = {
2722 .head.type = htons (TYPE_ENCR_AES256),
2723 .username = se->data.client.username
2726 username_len = strlen (pea.username);
2727 if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE)
2729 ERROR ("network plugin: Username too long: %s", pea.username);
2733 buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size;
2734 header_size = PART_ENCRYPTION_AES256_SIZE + username_len
2735 - sizeof (pea.hash);
2737 assert (buffer_size <= sizeof (buffer));
2738 DEBUG ("network plugin: network_send_buffer_encrypted: "
2739 "buffer_size = %zu;", buffer_size);
2741 pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE
2742 + username_len + in_buffer_size));
2743 pea.username_length = htons ((uint16_t) username_len);
2745 /* Chose a random initialization vector. */
2746 gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2748 /* Create hash of the payload */
2749 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2751 /* Initialize the buffer */
2753 memset (buffer, 0, sizeof (buffer));
2756 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2757 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2758 BUFFER_ADD (&pea.username_length, sizeof (pea.username_length));
2759 BUFFER_ADD (pea.username, username_len);
2760 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2761 assert (buffer_offset == header_size);
2762 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2763 BUFFER_ADD (in_buffer, in_buffer_size);
2765 assert (buffer_offset == buffer_size);
2767 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
2768 se->data.client.password);
2772 /* Encrypt the buffer in-place */
2773 err = gcry_cipher_encrypt (cypher,
2774 buffer + header_size,
2775 buffer_size - header_size,
2776 /* in = */ NULL, /* in len = */ 0);
2779 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2780 gcry_strerror (err));
2784 /* Send it out without further modifications */
2785 network_send_buffer_plain (se, buffer, buffer_size);
2786 } /* }}} void network_send_buffer_encrypted */
2788 #endif /* HAVE_LIBGCRYPT */
2790 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2792 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2794 for (sockent_t *se = sending_sockets; se != NULL; se = se->next)
2797 if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT)
2798 network_send_buffer_encrypted (se, buffer, buffer_len);
2799 else if (se->data.client.security_level == SECURITY_LEVEL_SIGN)
2800 network_send_buffer_signed (se, buffer, buffer_len);
2801 else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */
2802 #endif /* HAVE_LIBGCRYPT */
2803 network_send_buffer_plain (se, buffer, buffer_len);
2804 } /* for (sending_sockets) */
2805 } /* }}} void network_send_buffer */
2807 static int add_to_buffer (char *buffer, size_t buffer_size, /* {{{ */
2808 value_list_t *vl_def,
2809 const data_set_t *ds, const value_list_t *vl)
2811 char *buffer_orig = buffer;
2813 if (strcmp (vl_def->host, vl->host) != 0)
2815 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2816 vl->host, strlen (vl->host)) != 0)
2818 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2821 if (vl_def->time != vl->time)
2823 if (write_part_number (&buffer, &buffer_size, TYPE_TIME_HR,
2824 (uint64_t) vl->time))
2826 vl_def->time = vl->time;
2829 if (vl_def->interval != vl->interval)
2831 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL_HR,
2832 (uint64_t) vl->interval))
2834 vl_def->interval = vl->interval;
2837 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2839 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2840 vl->plugin, strlen (vl->plugin)) != 0)
2842 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2845 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2847 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2848 vl->plugin_instance,
2849 strlen (vl->plugin_instance)) != 0)
2851 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2854 if (strcmp (vl_def->type, vl->type) != 0)
2856 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2857 vl->type, strlen (vl->type)) != 0)
2859 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2862 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2864 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2866 strlen (vl->type_instance)) != 0)
2868 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2871 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2874 return (buffer - buffer_orig);
2875 } /* }}} int add_to_buffer */
2877 static void flush_buffer (void)
2879 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2882 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2884 stats_octets_tx += ((uint64_t) send_buffer_fill);
2887 network_init_buffer ();
2890 static int network_write (const data_set_t *ds, const value_list_t *vl,
2891 user_data_t __attribute__((unused)) *user_data)
2895 /* listen_loop is set to non-zero in the shutdown callback, which is
2896 * guaranteed to be called *after* all the write threads have been shut
2898 assert (listen_loop == 0);
2900 if (!check_send_okay (vl))
2903 char name[6*DATA_MAX_NAME_LEN];
2904 FORMAT_VL (name, sizeof (name), vl);
2905 name[sizeof (name) - 1] = 0;
2906 DEBUG ("network plugin: network_write: "
2907 "NOT sending %s.", name);
2909 /* Counter is not protected by another lock and may be reached by
2910 * multiple threads */
2911 pthread_mutex_lock (&stats_lock);
2912 stats_values_not_sent++;
2913 pthread_mutex_unlock (&stats_lock);
2917 uc_meta_data_add_unsigned_int (vl,
2918 "network:time_sent", (uint64_t) vl->time);
2920 pthread_mutex_lock (&send_buffer_lock);
2922 status = add_to_buffer (send_buffer_ptr,
2923 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2928 /* status == bytes added to the buffer */
2929 send_buffer_fill += status;
2930 send_buffer_ptr += status;
2931 send_buffer_last_update = cdtime();
2933 stats_values_sent++;
2939 status = add_to_buffer (send_buffer_ptr,
2940 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2946 send_buffer_fill += status;
2947 send_buffer_ptr += status;
2949 stats_values_sent++;
2955 ERROR ("network plugin: Unable to append to the "
2956 "buffer for some weird reason");
2958 else if ((network_config_packet_size - send_buffer_fill) < 15)
2963 pthread_mutex_unlock (&send_buffer_lock);
2965 return ((status < 0) ? -1 : 0);
2966 } /* int network_write */
2968 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2972 if (cf_util_get_int (ci, &tmp) != 0)
2974 else if ((tmp > 0) && (tmp <= 255))
2975 network_config_ttl = tmp;
2977 WARNING ("network plugin: The `TimeToLive' must be between 1 and 255.");
2982 } /* }}} int network_config_set_ttl */
2984 static int network_config_set_interface (const oconfig_item_t *ci, /* {{{ */
2989 if (cf_util_get_string_buffer (ci, if_name, sizeof (if_name)) != 0)
2992 *interface = if_nametoindex (if_name);
2994 } /* }}} int network_config_set_interface */
2996 static int network_config_set_buffer_size (const oconfig_item_t *ci) /* {{{ */
3000 if (cf_util_get_int (ci, &tmp) != 0)
3002 else if ((tmp >= 1024) && (tmp <= 65535))
3003 network_config_packet_size = tmp;
3005 WARNING ("network plugin: The `MaxPacketSize' must be between 1024 and 65535.");
3010 } /* }}} int network_config_set_buffer_size */
3013 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
3017 if ((ci->values_num != 1)
3018 || (ci->values[0].type != OCONFIG_TYPE_STRING))
3020 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
3021 "one string argument.");
3025 str = ci->values[0].value.string;
3026 if (strcasecmp ("Encrypt", str) == 0)
3027 *retval = SECURITY_LEVEL_ENCRYPT;
3028 else if (strcasecmp ("Sign", str) == 0)
3029 *retval = SECURITY_LEVEL_SIGN;
3030 else if (strcasecmp ("None", str) == 0)
3031 *retval = SECURITY_LEVEL_NONE;
3034 WARNING ("network plugin: Unknown security level: %s.", str);
3039 } /* }}} int network_config_set_security_level */
3040 #endif /* HAVE_LIBGCRYPT */
3042 static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */
3047 if ((ci->values_num < 1) || (ci->values_num > 2)
3048 || (ci->values[0].type != OCONFIG_TYPE_STRING)
3049 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
3051 ERROR ("network plugin: The `%s' config option needs "
3052 "one or two string arguments.", ci->key);
3056 se = sockent_create (SOCKENT_TYPE_SERVER);
3059 ERROR ("network plugin: sockent_create failed.");
3063 se->node = strdup (ci->values[0].value.string);
3064 if (ci->values_num >= 2)
3065 se->service = strdup (ci->values[1].value.string);
3067 for (int i = 0; i < ci->children_num; i++)
3069 oconfig_item_t *child = ci->children + i;
3072 if (strcasecmp ("AuthFile", child->key) == 0)
3073 cf_util_get_string (child, &se->data.server.auth_file);
3074 else if (strcasecmp ("SecurityLevel", child->key) == 0)
3075 network_config_set_security_level (child,
3076 &se->data.server.security_level);
3078 #endif /* HAVE_LIBGCRYPT */
3079 if (strcasecmp ("Interface", child->key) == 0)
3080 network_config_set_interface (child, &se->interface);
3083 WARNING ("network plugin: Option `%s' is not allowed here.",
3089 if ((se->data.server.security_level > SECURITY_LEVEL_NONE)
3090 && (se->data.server.auth_file == NULL))
3092 ERROR ("network plugin: A security level higher than `none' was "
3093 "requested, but no AuthFile option was given. Cowardly refusing to "
3094 "open this socket!");
3095 sockent_destroy (se);
3098 #endif /* HAVE_LIBGCRYPT */
3100 status = sockent_init_crypto (se);
3103 ERROR ("network plugin: network_config_add_listen: sockent_init_crypto() failed.");
3104 sockent_destroy (se);
3108 status = sockent_server_listen (se);
3111 ERROR ("network plugin: network_config_add_listen: sockent_server_listen failed.");
3112 sockent_destroy (se);
3116 status = sockent_add (se);
3119 ERROR ("network plugin: network_config_add_listen: sockent_add failed.");
3120 sockent_destroy (se);
3125 } /* }}} int network_config_add_listen */
3127 static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */
3132 if ((ci->values_num < 1) || (ci->values_num > 2)
3133 || (ci->values[0].type != OCONFIG_TYPE_STRING)
3134 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
3136 ERROR ("network plugin: The `%s' config option needs "
3137 "one or two string arguments.", ci->key);
3141 se = sockent_create (SOCKENT_TYPE_CLIENT);
3144 ERROR ("network plugin: sockent_create failed.");
3148 se->node = strdup (ci->values[0].value.string);
3149 if (ci->values_num >= 2)
3150 se->service = strdup (ci->values[1].value.string);
3152 for (int i = 0; i < ci->children_num; i++)
3154 oconfig_item_t *child = ci->children + i;
3157 if (strcasecmp ("Username", child->key) == 0)
3158 cf_util_get_string (child, &se->data.client.username);
3159 else if (strcasecmp ("Password", child->key) == 0)
3160 cf_util_get_string (child, &se->data.client.password);
3161 else if (strcasecmp ("SecurityLevel", child->key) == 0)
3162 network_config_set_security_level (child,
3163 &se->data.client.security_level);
3165 #endif /* HAVE_LIBGCRYPT */
3166 if (strcasecmp ("Interface", child->key) == 0)
3167 network_config_set_interface (child, &se->interface);
3168 else if (strcasecmp ("ResolveInterval", child->key) == 0)
3169 cf_util_get_cdtime(child, &se->data.client.resolve_interval);
3172 WARNING ("network plugin: Option `%s' is not allowed here.",
3178 if ((se->data.client.security_level > SECURITY_LEVEL_NONE)
3179 && ((se->data.client.username == NULL)
3180 || (se->data.client.password == NULL)))
3182 ERROR ("network plugin: A security level higher than `none' was "
3183 "requested, but no Username or Password option was given. "
3184 "Cowardly refusing to open this socket!");
3185 sockent_destroy (se);
3188 #endif /* HAVE_LIBGCRYPT */
3190 status = sockent_init_crypto (se);
3193 ERROR ("network plugin: network_config_add_server: sockent_init_crypto() failed.");
3194 sockent_destroy (se);
3198 /* No call to sockent_client_connect() here -- it is called from
3199 * network_send_buffer_plain(). */
3201 status = sockent_add (se);
3204 ERROR ("network plugin: network_config_add_server: sockent_add failed.");
3205 sockent_destroy (se);
3210 } /* }}} int network_config_add_server */
3212 static int network_config (oconfig_item_t *ci) /* {{{ */
3214 /* The options need to be applied first */
3215 for (int i = 0; i < ci->children_num; i++)
3217 oconfig_item_t *child = ci->children + i;
3218 if (strcasecmp ("TimeToLive", child->key) == 0)
3219 network_config_set_ttl (child);
3222 for (int i = 0; i < ci->children_num; i++)
3224 oconfig_item_t *child = ci->children + i;
3226 if (strcasecmp ("Listen", child->key) == 0)
3227 network_config_add_listen (child);
3228 else if (strcasecmp ("Server", child->key) == 0)
3229 network_config_add_server (child);
3230 else if (strcasecmp ("TimeToLive", child->key) == 0) {
3231 /* Handled earlier */
3233 else if (strcasecmp ("MaxPacketSize", child->key) == 0)
3234 network_config_set_buffer_size (child);
3235 else if (strcasecmp ("Forward", child->key) == 0)
3236 cf_util_get_boolean (child, &network_config_forward);
3237 else if (strcasecmp ("ReportStats", child->key) == 0)
3238 cf_util_get_boolean (child, &network_config_stats);
3241 WARNING ("network plugin: Option `%s' is not allowed here.",
3247 } /* }}} int network_config */
3249 static int network_notification (const notification_t *n,
3250 user_data_t __attribute__((unused)) *user_data)
3252 char buffer[network_config_packet_size];
3253 char *buffer_ptr = buffer;
3254 size_t buffer_free = sizeof (buffer);
3257 if (!check_send_notify_okay (n))
3260 memset (buffer, 0, sizeof (buffer));
3262 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME_HR,
3263 (uint64_t) n->time);
3267 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
3268 (uint64_t) n->severity);
3272 if (strlen (n->host) > 0)
3274 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
3275 n->host, strlen (n->host));
3280 if (strlen (n->plugin) > 0)
3282 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
3283 n->plugin, strlen (n->plugin));
3288 if (strlen (n->plugin_instance) > 0)
3290 status = write_part_string (&buffer_ptr, &buffer_free,
3291 TYPE_PLUGIN_INSTANCE,
3292 n->plugin_instance, strlen (n->plugin_instance));
3297 if (strlen (n->type) > 0)
3299 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
3300 n->type, strlen (n->type));
3305 if (strlen (n->type_instance) > 0)
3307 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
3308 n->type_instance, strlen (n->type_instance));
3313 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
3314 n->message, strlen (n->message));
3318 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
3321 } /* int network_notification */
3323 static int network_shutdown (void)
3327 /* Kill the listening thread */
3328 if (receive_thread_running != 0)
3330 INFO ("network plugin: Stopping receive thread.");
3331 pthread_kill (receive_thread_id, SIGTERM);
3332 pthread_join (receive_thread_id, NULL /* no return value */);
3333 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
3334 receive_thread_running = 0;
3337 /* Shutdown the dispatching thread */
3338 if (dispatch_thread_running != 0)
3340 INFO ("network plugin: Stopping dispatch thread.");
3341 pthread_mutex_lock (&receive_list_lock);
3342 pthread_cond_broadcast (&receive_list_cond);
3343 pthread_mutex_unlock (&receive_list_lock);
3344 pthread_join (dispatch_thread_id, /* ret = */ NULL);
3345 dispatch_thread_running = 0;
3348 sockent_destroy (listen_sockets);
3350 if (send_buffer_fill > 0)
3353 sfree (send_buffer);
3355 for (sockent_t *se = sending_sockets; se != NULL; se = se->next)
3356 sockent_client_disconnect (se);
3357 sockent_destroy (sending_sockets);
3359 plugin_unregister_config ("network");
3360 plugin_unregister_init ("network");
3361 plugin_unregister_write ("network");
3362 plugin_unregister_shutdown ("network");
3365 } /* int network_shutdown */
3367 static int network_stats_read (void) /* {{{ */
3369 derive_t copy_octets_rx;
3370 derive_t copy_octets_tx;
3371 derive_t copy_packets_rx;
3372 derive_t copy_packets_tx;
3373 derive_t copy_values_dispatched;
3374 derive_t copy_values_not_dispatched;
3375 derive_t copy_values_sent;
3376 derive_t copy_values_not_sent;
3377 derive_t copy_receive_list_length;
3378 value_list_t vl = VALUE_LIST_INIT;
3381 copy_octets_rx = stats_octets_rx;
3382 copy_octets_tx = stats_octets_tx;
3383 copy_packets_rx = stats_packets_rx;
3384 copy_packets_tx = stats_packets_tx;
3385 copy_values_dispatched = stats_values_dispatched;
3386 copy_values_not_dispatched = stats_values_not_dispatched;
3387 copy_values_sent = stats_values_sent;
3388 copy_values_not_sent = stats_values_not_sent;
3389 copy_receive_list_length = receive_list_length;
3391 /* Initialize `vl' */
3395 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
3396 sstrncpy (vl.plugin, "network", sizeof (vl.plugin));
3398 /* Octets received / sent */
3399 vl.values[0].derive = (derive_t) copy_octets_rx;
3400 vl.values[1].derive = (derive_t) copy_octets_tx;
3401 sstrncpy (vl.type, "if_octets", sizeof (vl.type));
3402 plugin_dispatch_values (&vl);
3404 /* Packets received / send */
3405 vl.values[0].derive = (derive_t) copy_packets_rx;
3406 vl.values[1].derive = (derive_t) copy_packets_tx;
3407 sstrncpy (vl.type, "if_packets", sizeof (vl.type));
3408 plugin_dispatch_values (&vl);
3410 /* Values (not) dispatched and (not) send */
3411 sstrncpy (vl.type, "total_values", sizeof (vl.type));
3414 vl.values[0].derive = (derive_t) copy_values_dispatched;
3415 sstrncpy (vl.type_instance, "dispatch-accepted",
3416 sizeof (vl.type_instance));
3417 plugin_dispatch_values (&vl);
3419 vl.values[0].derive = (derive_t) copy_values_not_dispatched;
3420 sstrncpy (vl.type_instance, "dispatch-rejected",
3421 sizeof (vl.type_instance));
3422 plugin_dispatch_values (&vl);
3424 vl.values[0].derive = (derive_t) copy_values_sent;
3425 sstrncpy (vl.type_instance, "send-accepted",
3426 sizeof (vl.type_instance));
3427 plugin_dispatch_values (&vl);
3429 vl.values[0].derive = (derive_t) copy_values_not_sent;
3430 sstrncpy (vl.type_instance, "send-rejected",
3431 sizeof (vl.type_instance));
3432 plugin_dispatch_values (&vl);
3434 /* Receive queue length */
3435 vl.values[0].gauge = (gauge_t) copy_receive_list_length;
3436 sstrncpy (vl.type, "queue_length", sizeof (vl.type));
3437 vl.type_instance[0] = 0;
3438 plugin_dispatch_values (&vl);
3441 } /* }}} int network_stats_read */
3443 static int network_init (void)
3445 static _Bool have_init = 0;
3447 /* Check if we were already initialized. If so, just return - there's
3448 * nothing more to do (for now, that is). */
3454 if (network_init_gcrypt () < 0)
3456 ERROR ("network plugin: Failed to initialize crypto library.");
3461 if (network_config_stats)
3462 plugin_register_read ("network", network_stats_read);
3464 plugin_register_shutdown ("network", network_shutdown);
3466 send_buffer = malloc (network_config_packet_size);
3467 if (send_buffer == NULL)
3469 ERROR ("network plugin: malloc failed.");
3472 network_init_buffer ();
3474 /* setup socket(s) and so on */
3475 if (sending_sockets != NULL)
3477 plugin_register_write ("network", network_write,
3478 /* user_data = */ NULL);
3479 plugin_register_notification ("network", network_notification,
3480 /* user_data = */ NULL);
3483 /* If no threads need to be started, return here. */
3484 if ((listen_sockets_num == 0)
3485 || ((dispatch_thread_running != 0)
3486 && (receive_thread_running != 0)))
3489 if (dispatch_thread_running == 0)
3492 status = plugin_thread_create (&dispatch_thread_id,
3493 NULL /* no attributes */,
3495 NULL /* no argument */);
3499 ERROR ("network: pthread_create failed: %s",
3500 sstrerror (errno, errbuf,
3505 dispatch_thread_running = 1;
3509 if (receive_thread_running == 0)
3512 status = plugin_thread_create (&receive_thread_id,
3513 NULL /* no attributes */,
3515 NULL /* no argument */);
3519 ERROR ("network: pthread_create failed: %s",
3520 sstrerror (errno, errbuf,
3525 receive_thread_running = 1;
3530 } /* int network_init */
3533 * The flush option of the network plugin cannot flush individual identifiers.
3534 * All the values are added to a buffer and sent when the buffer is full, the
3535 * requested value may or may not be in there, it's not worth finding out. We
3536 * just send the buffer if `flush' is called - if the requested value was in
3537 * there, good. If not, well, then there is nothing to flush.. -octo
3539 static int network_flush (cdtime_t timeout,
3540 __attribute__((unused)) const char *identifier,
3541 __attribute__((unused)) user_data_t *user_data)
3543 pthread_mutex_lock (&send_buffer_lock);
3545 if (send_buffer_fill > 0)
3549 cdtime_t now = cdtime ();
3550 if ((send_buffer_last_update + timeout) > now)
3552 pthread_mutex_unlock (&send_buffer_lock);
3558 pthread_mutex_unlock (&send_buffer_lock);
3561 } /* int network_flush */
3563 void module_register (void)
3565 plugin_register_complex_config ("network", network_config);
3566 plugin_register_init ("network", network_init);
3567 plugin_register_flush ("network", network_flush,
3568 /* user_data = */ NULL);
3569 } /* void module_register */
3571 /* vim: set fdm=marker : */