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 */
31 #include "configfile.h"
32 #include "utils_fbhash.h"
33 #include "utils_avltree.h"
34 #include "utils_cache.h"
35 #include "utils_complain.h"
43 # include <sys/socket.h>
49 # include <netinet/in.h>
52 # include <arpa/inet.h>
63 # if defined __APPLE__
64 /* default xcode compiler throws warnings even when deprecated functionality
65 * is not used. -Werror breaks the build because of erroneous warnings.
66 * http://stackoverflow.com/questions/10556299/compiler-warnings-with-libgcrypt-v1-5-0/12830209#12830209
68 # pragma GCC diagnostic ignored "-Wdeprecated-declarations"
70 /* FreeBSD's copy of libgcrypt extends the existing GCRYPT_NO_DEPRECATED
71 * to properly hide all deprecated functionality.
72 * http://svnweb.freebsd.org/ports/head/security/libgcrypt/files/patch-src__gcrypt.h.in
74 # define GCRYPT_NO_DEPRECATED
76 # if defined __APPLE__
77 /* Re enable deprecation warnings */
78 # pragma GCC diagnostic warning "-Wdeprecated-declarations"
80 # if GCRYPT_VERSION_NUMBER < 0x010600
81 GCRY_THREAD_OPTION_PTHREAD_IMPL;
85 #ifndef IPV6_ADD_MEMBERSHIP
86 # ifdef IPV6_JOIN_GROUP
87 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
89 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
91 #endif /* !IP_ADD_MEMBERSHIP */
94 * Maximum size required for encryption / signing:
96 * 42 bytes for the encryption header
97 * + 64 bytes for the username
101 #define BUFF_SIG_SIZE 106
106 #define SECURITY_LEVEL_NONE 0
108 # define SECURITY_LEVEL_SIGN 1
109 # define SECURITY_LEVEL_ENCRYPT 2
111 struct sockent_client
114 struct sockaddr_storage *addr;
120 gcry_cipher_hd_t cypher;
121 unsigned char password_hash[32];
125 struct sockent_server
133 gcry_cipher_hd_t cypher;
137 typedef struct sockent
139 #define SOCKENT_TYPE_CLIENT 1
140 #define SOCKENT_TYPE_SERVER 2
149 struct sockent_client client;
150 struct sockent_server server;
153 struct sockent *next;
156 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
157 * 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
158 * +-------+-----------------------+-------------------------------+
159 * ! Ver. ! ! Length !
160 * +-------+-----------------------+-------------------------------+
167 typedef struct part_header_s part_header_t;
169 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
170 * 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
171 * +-------------------------------+-------------------------------+
173 * +-------------------------------+-------------------------------+
174 * : (Length - 4) Bytes :
175 * +---------------------------------------------------------------+
182 typedef struct part_string_s part_string_t;
184 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
185 * 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
186 * +-------------------------------+-------------------------------+
188 * +-------------------------------+-------------------------------+
189 * : (Length - 4 == 2 || 4 || 8) Bytes :
190 * +---------------------------------------------------------------+
197 typedef struct part_number_s part_number_t;
199 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
200 * 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
201 * +-------------------------------+-------------------------------+
203 * +-------------------------------+---------------+---------------+
204 * ! Num of values ! Type0 ! Type1 !
205 * +-------------------------------+---------------+---------------+
208 * +---------------------------------------------------------------+
211 * +---------------------------------------------------------------+
216 uint16_t *num_values;
217 uint8_t *values_types;
220 typedef struct part_values_s part_values_t;
222 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
223 * 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
224 * +-------------------------------+-------------------------------+
226 * +-------------------------------+-------------------------------+
227 * ! Hash (Bits 0 - 31) !
229 * ! Hash (Bits 224 - 255) !
230 * +---------------------------------------------------------------+
233 #define PART_SIGNATURE_SHA256_SIZE 36
234 struct part_signature_sha256_s
237 unsigned char hash[32];
240 typedef struct part_signature_sha256_s part_signature_sha256_t;
242 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
243 * 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
244 * +-------------------------------+-------------------------------+
246 * +-------------------------------+-------------------------------+
247 * ! Original length ! Padding (0 - 15 bytes) !
248 * +-------------------------------+-------------------------------+
249 * ! Hash (Bits 0 - 31) !
251 * ! Hash (Bits 128 - 159) !
252 * +---------------------------------------------------------------+
255 #define PART_ENCRYPTION_AES256_SIZE 42
256 struct part_encryption_aes256_s
259 uint16_t username_length;
261 unsigned char iv[16];
263 unsigned char hash[20];
267 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
269 struct receive_list_entry_s
274 struct receive_list_entry_s *next;
276 typedef struct receive_list_entry_s receive_list_entry_t;
281 static int network_config_ttl = 0;
282 /* Ethernet - (IPv6 + UDP) = 1500 - (40 + 8) = 1452 */
283 static size_t network_config_packet_size = 1452;
284 static int network_config_forward = 0;
285 static int network_config_stats = 0;
287 static sockent_t *sending_sockets = NULL;
289 static receive_list_entry_t *receive_list_head = NULL;
290 static receive_list_entry_t *receive_list_tail = NULL;
291 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
292 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
293 static uint64_t receive_list_length = 0;
295 static sockent_t *listen_sockets = NULL;
296 static struct pollfd *listen_sockets_pollfd = NULL;
297 static size_t listen_sockets_num = 0;
299 /* The receive and dispatch threads will run as long as `listen_loop' is set to
301 static int listen_loop = 0;
302 static int receive_thread_running = 0;
303 static pthread_t receive_thread_id;
304 static int dispatch_thread_running = 0;
305 static pthread_t dispatch_thread_id;
307 /* Buffer in which to-be-sent network packets are constructed. */
308 static char *send_buffer;
309 static char *send_buffer_ptr;
310 static int send_buffer_fill;
311 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
312 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
314 /* XXX: These counters are incremented from one place only. The spot in which
315 * the values are incremented is either only reachable by one thread (the
316 * dispatch thread, for example) or locked by some lock (send_buffer_lock for
317 * example). Only if neither is true, the stats_lock is acquired. The counters
318 * are always read without holding a lock in the hope that writing 8 bytes to
319 * memory is an atomic operation. */
320 static derive_t stats_octets_rx = 0;
321 static derive_t stats_octets_tx = 0;
322 static derive_t stats_packets_rx = 0;
323 static derive_t stats_packets_tx = 0;
324 static derive_t stats_values_dispatched = 0;
325 static derive_t stats_values_not_dispatched = 0;
326 static derive_t stats_values_sent = 0;
327 static derive_t stats_values_not_sent = 0;
328 static pthread_mutex_t stats_lock = PTHREAD_MUTEX_INITIALIZER;
333 static _Bool check_receive_okay (const value_list_t *vl) /* {{{ */
335 uint64_t time_sent = 0;
338 status = uc_meta_data_get_unsigned_int (vl,
339 "network:time_sent", &time_sent);
341 /* This is a value we already sent. Don't allow it to be received again in
342 * order to avoid looping. */
343 if ((status == 0) && (time_sent >= ((uint64_t) vl->time)))
347 } /* }}} _Bool check_receive_okay */
349 static _Bool check_send_okay (const value_list_t *vl) /* {{{ */
354 if (network_config_forward != 0)
357 if (vl->meta == NULL)
360 status = meta_data_get_boolean (vl->meta, "network:received", &received);
361 if (status == -ENOENT)
363 else if (status != 0)
365 ERROR ("network plugin: check_send_okay: meta_data_get_boolean failed "
366 "with status %i.", status);
370 /* By default, only *send* value lists that were not *received* by the
373 } /* }}} _Bool check_send_okay */
375 static _Bool check_notify_received (const notification_t *n) /* {{{ */
377 notification_meta_t *ptr;
379 for (ptr = n->meta; ptr != NULL; ptr = ptr->next)
380 if ((strcmp ("network:received", ptr->name) == 0)
381 && (ptr->type == NM_TYPE_BOOLEAN))
382 return ((_Bool) ptr->nm_value.nm_boolean);
385 } /* }}} _Bool check_notify_received */
387 static _Bool check_send_notify_okay (const notification_t *n) /* {{{ */
389 static c_complain_t complain_forwarding = C_COMPLAIN_INIT_STATIC;
395 received = check_notify_received (n);
397 if (network_config_forward && received)
399 c_complain_once (LOG_ERR, &complain_forwarding,
400 "network plugin: A notification has been received via the network "
401 "and forwarding is enabled. Forwarding of notifications is currently "
402 "not supported, because there is not loop-deteciton available. "
403 "Please contact the collectd mailing list if you need this "
407 /* By default, only *send* value lists that were not *received* by the
410 } /* }}} _Bool check_send_notify_okay */
412 static int network_dispatch_values (value_list_t *vl, /* {{{ */
413 const char *username)
418 || (strlen (vl->host) <= 0)
419 || (strlen (vl->plugin) <= 0)
420 || (strlen (vl->type) <= 0))
423 if (!check_receive_okay (vl))
426 char name[6*DATA_MAX_NAME_LEN];
427 FORMAT_VL (name, sizeof (name), vl);
428 name[sizeof (name) - 1] = 0;
429 DEBUG ("network plugin: network_dispatch_values: "
430 "NOT dispatching %s.", name);
432 stats_values_not_dispatched++;
436 assert (vl->meta == NULL);
438 vl->meta = meta_data_create ();
439 if (vl->meta == NULL)
441 ERROR ("network plugin: meta_data_create failed.");
445 status = meta_data_add_boolean (vl->meta, "network:received", 1);
448 ERROR ("network plugin: meta_data_add_boolean failed.");
449 meta_data_destroy (vl->meta);
454 if (username != NULL)
456 status = meta_data_add_string (vl->meta, "network:username", username);
459 ERROR ("network plugin: meta_data_add_string failed.");
460 meta_data_destroy (vl->meta);
466 plugin_dispatch_values (vl);
467 stats_values_dispatched++;
469 meta_data_destroy (vl->meta);
473 } /* }}} int network_dispatch_values */
475 static int network_dispatch_notification (notification_t *n) /* {{{ */
479 assert (n->meta == NULL);
481 status = plugin_notification_meta_add_boolean (n, "network:received", 1);
484 ERROR ("network plugin: plugin_notification_meta_add_boolean failed.");
485 plugin_notification_meta_free (n->meta);
490 status = plugin_dispatch_notification (n);
492 plugin_notification_meta_free (n->meta);
496 } /* }}} int network_dispatch_notification */
499 static void network_init_gcrypt (void) /* {{{ */
501 /* http://lists.gnupg.org/pipermail/gcrypt-devel/2003-August/000458.html
502 * Because you can't know in a library whether another library has
503 * already initialized the library */
504 if (gcry_control (GCRYCTL_ANY_INITIALIZATION_P))
507 /* http://www.gnupg.org/documentation/manuals/gcrypt/Multi_002dThreading.html
508 * To ensure thread-safety, it's important to set GCRYCTL_SET_THREAD_CBS
509 * *before* initalizing Libgcrypt with gcry_check_version(), which itself must
510 * be called before any other gcry_* function. GCRYCTL_ANY_INITIALIZATION_P
511 * above doesn't count, as it doesn't implicitly initalize Libgcrypt.
513 * tl;dr: keep all these gry_* statements in this exact order please. */
514 # if GCRYPT_VERSION_NUMBER < 0x010600
515 gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
517 gcry_check_version (NULL);
518 gcry_control (GCRYCTL_INIT_SECMEM, 32768);
519 gcry_control (GCRYCTL_INITIALIZATION_FINISHED);
520 } /* }}} void network_init_gcrypt */
522 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
523 const void *iv, size_t iv_size, const char *username)
526 gcry_cipher_hd_t *cyper_ptr;
527 unsigned char password_hash[32];
529 if (se->type == SOCKENT_TYPE_CLIENT)
531 cyper_ptr = &se->data.client.cypher;
532 memcpy (password_hash, se->data.client.password_hash,
533 sizeof (password_hash));
539 cyper_ptr = &se->data.server.cypher;
541 if (username == NULL)
544 secret = fbh_get (se->data.server.userdb, username);
548 gcry_md_hash_buffer (GCRY_MD_SHA256,
550 secret, strlen (secret));
555 if (*cyper_ptr == NULL)
557 err = gcry_cipher_open (cyper_ptr,
558 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0);
561 ERROR ("network plugin: gcry_cipher_open returned: %s",
562 gcry_strerror (err));
569 gcry_cipher_reset (*cyper_ptr);
571 assert (*cyper_ptr != NULL);
573 err = gcry_cipher_setkey (*cyper_ptr,
574 password_hash, sizeof (password_hash));
577 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
578 gcry_strerror (err));
579 gcry_cipher_close (*cyper_ptr);
584 err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size);
587 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
588 gcry_strerror (err));
589 gcry_cipher_close (*cyper_ptr);
595 } /* }}} int network_get_aes256_cypher */
596 #endif /* HAVE_LIBGCRYPT */
598 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
599 const data_set_t *ds, const value_list_t *vl)
605 part_header_t pkg_ph;
606 uint16_t pkg_num_values;
607 uint8_t *pkg_values_types;
613 num_values = vl->values_len;
614 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
615 + (num_values * sizeof (uint8_t))
616 + (num_values * sizeof (value_t));
618 if (*ret_buffer_len < packet_len)
621 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
622 if (pkg_values_types == NULL)
624 ERROR ("network plugin: write_part_values: malloc failed.");
628 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
629 if (pkg_values == NULL)
631 free (pkg_values_types);
632 ERROR ("network plugin: write_part_values: malloc failed.");
636 pkg_ph.type = htons (TYPE_VALUES);
637 pkg_ph.length = htons (packet_len);
639 pkg_num_values = htons ((uint16_t) vl->values_len);
641 for (i = 0; i < num_values; i++)
643 pkg_values_types[i] = (uint8_t) ds->ds[i].type;
644 switch (ds->ds[i].type)
646 case DS_TYPE_COUNTER:
647 pkg_values[i].counter = htonll (vl->values[i].counter);
651 pkg_values[i].gauge = htond (vl->values[i].gauge);
655 pkg_values[i].derive = htonll (vl->values[i].derive);
658 case DS_TYPE_ABSOLUTE:
659 pkg_values[i].absolute = htonll (vl->values[i].absolute);
663 free (pkg_values_types);
665 ERROR ("network plugin: write_part_values: "
666 "Unknown data source type: %i",
669 } /* switch (ds->ds[i].type) */
670 } /* for (num_values) */
673 * Use `memcpy' to write everything to the buffer, because the pointer
674 * may be unaligned and some architectures, such as SPARC, can't handle
677 packet_ptr = *ret_buffer;
679 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
680 offset += sizeof (pkg_ph);
681 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
682 offset += sizeof (pkg_num_values);
683 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
684 offset += num_values * sizeof (uint8_t);
685 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
686 offset += num_values * sizeof (value_t);
688 assert (offset == packet_len);
690 *ret_buffer = packet_ptr + packet_len;
691 *ret_buffer_len -= packet_len;
693 free (pkg_values_types);
697 } /* int write_part_values */
699 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
700 int type, uint64_t value)
705 part_header_t pkg_head;
710 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
712 if (*ret_buffer_len < packet_len)
715 pkg_head.type = htons (type);
716 pkg_head.length = htons (packet_len);
717 pkg_value = htonll (value);
719 packet_ptr = *ret_buffer;
721 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
722 offset += sizeof (pkg_head);
723 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
724 offset += sizeof (pkg_value);
726 assert (offset == packet_len);
728 *ret_buffer = packet_ptr + packet_len;
729 *ret_buffer_len -= packet_len;
732 } /* int write_part_number */
734 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
735 int type, const char *str, int str_len)
745 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
746 if (*ret_buffer_len < buffer_len)
749 pkg_type = htons (type);
750 pkg_length = htons (buffer_len);
752 buffer = *ret_buffer;
754 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
755 offset += sizeof (pkg_type);
756 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
757 offset += sizeof (pkg_length);
758 memcpy (buffer + offset, str, str_len);
760 memset (buffer + offset, '\0', 1);
763 assert (offset == buffer_len);
765 *ret_buffer = buffer + buffer_len;
766 *ret_buffer_len -= buffer_len;
769 } /* int write_part_string */
771 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
772 value_t **ret_values, int *ret_num_values)
774 char *buffer = *ret_buffer;
775 size_t buffer_len = *ret_buffer_len;
790 NOTICE ("network plugin: packet is too short: "
791 "buffer_len = %zu", buffer_len);
795 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
796 buffer += sizeof (tmp16);
797 pkg_type = ntohs (tmp16);
799 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
800 buffer += sizeof (tmp16);
801 pkg_length = ntohs (tmp16);
803 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
804 buffer += sizeof (tmp16);
805 pkg_numval = ntohs (tmp16);
807 assert (pkg_type == TYPE_VALUES);
809 exp_size = 3 * sizeof (uint16_t)
810 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
811 if (buffer_len < exp_size)
813 WARNING ("network plugin: parse_part_values: "
815 "Chunk of size %zu expected, "
816 "but buffer has only %zu bytes left.",
817 exp_size, buffer_len);
821 if (pkg_length != exp_size)
823 WARNING ("network plugin: parse_part_values: "
824 "Length and number of values "
825 "in the packet don't match.");
829 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
830 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
831 if ((pkg_types == NULL) || (pkg_values == NULL))
835 ERROR ("network plugin: parse_part_values: malloc failed.");
839 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
840 buffer += pkg_numval * sizeof (uint8_t);
841 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
842 buffer += pkg_numval * sizeof (value_t);
844 for (i = 0; i < pkg_numval; i++)
846 switch (pkg_types[i])
848 case DS_TYPE_COUNTER:
849 pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter);
853 pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge);
857 pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive);
860 case DS_TYPE_ABSOLUTE:
861 pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute);
865 NOTICE ("network plugin: parse_part_values: "
866 "Don't know how to handle data source type %"PRIu8,
871 } /* switch (pkg_types[i]) */
874 *ret_buffer = buffer;
875 *ret_buffer_len = buffer_len - pkg_length;
876 *ret_num_values = pkg_numval;
877 *ret_values = pkg_values;
882 } /* int parse_part_values */
884 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
887 char *buffer = *ret_buffer;
888 size_t buffer_len = *ret_buffer_len;
892 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
896 if (buffer_len < exp_size)
898 WARNING ("network plugin: parse_part_number: "
900 "Chunk of size %zu expected, "
901 "but buffer has only %zu bytes left.",
902 exp_size, buffer_len);
906 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
907 buffer += sizeof (tmp16);
908 /* pkg_type = ntohs (tmp16); */
910 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
911 buffer += sizeof (tmp16);
912 pkg_length = ntohs (tmp16);
914 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
915 buffer += sizeof (tmp64);
916 *value = ntohll (tmp64);
918 *ret_buffer = buffer;
919 *ret_buffer_len = buffer_len - pkg_length;
922 } /* int parse_part_number */
924 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
925 char *output, int output_len)
927 char *buffer = *ret_buffer;
928 size_t buffer_len = *ret_buffer_len;
931 size_t header_size = 2 * sizeof (uint16_t);
935 if (buffer_len < header_size)
937 WARNING ("network plugin: parse_part_string: "
939 "Chunk of at least size %zu expected, "
940 "but buffer has only %zu bytes left.",
941 header_size, buffer_len);
945 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
946 buffer += sizeof (tmp16);
947 /* pkg_type = ntohs (tmp16); */
949 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
950 buffer += sizeof (tmp16);
951 pkg_length = ntohs (tmp16);
953 /* Check that packet fits in the input buffer */
954 if (pkg_length > buffer_len)
956 WARNING ("network plugin: parse_part_string: "
958 "Chunk of size %"PRIu16" received, "
959 "but buffer has only %zu bytes left.",
960 pkg_length, buffer_len);
964 /* Check that pkg_length is in the valid range */
965 if (pkg_length <= header_size)
967 WARNING ("network plugin: parse_part_string: "
969 "Header claims this packet is only %hu "
970 "bytes long.", pkg_length);
974 /* Check that the package data fits into the output buffer.
975 * The previous if-statement ensures that:
976 * `pkg_length > header_size' */
978 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
980 WARNING ("network plugin: parse_part_string: "
981 "Output buffer too small.");
985 /* All sanity checks successfull, let's copy the data over */
986 output_len = pkg_length - header_size;
987 memcpy ((void *) output, (void *) buffer, output_len);
988 buffer += output_len;
990 /* For some very weird reason '\0' doesn't do the trick on SPARC in
992 if (output[output_len - 1] != 0)
994 WARNING ("network plugin: parse_part_string: "
995 "Received string does not end "
996 "with a NULL-byte.");
1000 *ret_buffer = buffer;
1001 *ret_buffer_len = buffer_len - pkg_length;
1004 } /* int parse_part_string */
1006 /* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call
1007 * parse_packet and vice versa. */
1008 #define PP_SIGNED 0x01
1009 #define PP_ENCRYPTED 0x02
1010 static int parse_packet (sockent_t *se,
1011 void *buffer, size_t buffer_size, int flags,
1012 const char *username);
1014 #define BUFFER_READ(p,s) do { \
1015 memcpy ((p), buffer + buffer_offset, (s)); \
1016 buffer_offset += (s); \
1020 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1021 void **ret_buffer, size_t *ret_buffer_len, int flags)
1023 static c_complain_t complain_no_users = C_COMPLAIN_INIT_STATIC;
1027 size_t buffer_offset;
1029 size_t username_len;
1032 part_signature_sha256_t pss;
1033 uint16_t pss_head_length;
1034 char hash[sizeof (pss.hash)];
1038 unsigned char *hash_ptr;
1040 buffer = *ret_buffer;
1041 buffer_len = *ret_buffer_len;
1044 if (se->data.server.userdb == NULL)
1046 c_complain (LOG_NOTICE, &complain_no_users,
1047 "network plugin: Received signed network packet but can't verify it "
1048 "because no user DB has been configured. Will accept it.");
1052 /* Check if the buffer has enough data for this structure. */
1053 if (buffer_len <= PART_SIGNATURE_SHA256_SIZE)
1056 /* Read type and length header */
1057 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1058 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1059 pss_head_length = ntohs (pss.head.length);
1061 /* Check if the `pss_head_length' is within bounds. */
1062 if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE)
1063 || (pss_head_length > buffer_len))
1065 ERROR ("network plugin: HMAC-SHA-256 with invalid length received.");
1069 /* Copy the hash. */
1070 BUFFER_READ (pss.hash, sizeof (pss.hash));
1072 /* Calculate username length (without null byte) and allocate memory */
1073 username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE;
1074 pss.username = malloc (username_len + 1);
1075 if (pss.username == NULL)
1078 /* Read the username */
1079 BUFFER_READ (pss.username, username_len);
1080 pss.username[username_len] = 0;
1082 assert (buffer_offset == pss_head_length);
1084 /* Query the password */
1085 secret = fbh_get (se->data.server.userdb, pss.username);
1088 ERROR ("network plugin: Unknown user: %s", pss.username);
1089 sfree (pss.username);
1093 /* Create a hash device and check the HMAC */
1095 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
1098 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
1099 gcry_strerror (err));
1101 sfree (pss.username);
1105 err = gcry_md_setkey (hd, secret, strlen (secret));
1108 ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err));
1111 sfree (pss.username);
1116 buffer + PART_SIGNATURE_SHA256_SIZE,
1117 buffer_len - PART_SIGNATURE_SHA256_SIZE);
1118 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
1119 if (hash_ptr == NULL)
1121 ERROR ("network plugin: gcry_md_read failed.");
1124 sfree (pss.username);
1127 memcpy (hash, hash_ptr, sizeof (hash));
1133 if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0)
1135 WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: "
1140 parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset,
1141 flags | PP_SIGNED, pss.username);
1145 sfree (pss.username);
1147 *ret_buffer = buffer + buffer_len;
1148 *ret_buffer_len = 0;
1151 } /* }}} int parse_part_sign_sha256 */
1152 /* #endif HAVE_LIBGCRYPT */
1154 #else /* if !HAVE_LIBGCRYPT */
1155 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1156 void **ret_buffer, size_t *ret_buffer_size, int flags)
1158 static int warning_has_been_printed = 0;
1162 size_t buffer_offset;
1165 part_signature_sha256_t pss;
1167 buffer = *ret_buffer;
1168 buffer_size = *ret_buffer_size;
1171 if (buffer_size <= PART_SIGNATURE_SHA256_SIZE)
1174 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1175 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1176 part_len = ntohs (pss.head.length);
1178 if ((part_len <= PART_SIGNATURE_SHA256_SIZE)
1179 || (part_len > buffer_size))
1182 if (warning_has_been_printed == 0)
1184 WARNING ("network plugin: Received signed packet, but the network "
1185 "plugin was not linked with libgcrypt, so I cannot "
1186 "verify the signature. The packet will be accepted.");
1187 warning_has_been_printed = 1;
1190 parse_packet (se, buffer + part_len, buffer_size - part_len, flags,
1191 /* username = */ NULL);
1193 *ret_buffer = buffer + buffer_size;
1194 *ret_buffer_size = 0;
1197 } /* }}} int parse_part_sign_sha256 */
1198 #endif /* !HAVE_LIBGCRYPT */
1201 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1202 void **ret_buffer, size_t *ret_buffer_len,
1205 char *buffer = *ret_buffer;
1206 size_t buffer_len = *ret_buffer_len;
1209 size_t buffer_offset;
1210 uint16_t username_len;
1211 part_encryption_aes256_t pea;
1212 unsigned char hash[sizeof (pea.hash)];
1214 gcry_cipher_hd_t cypher;
1217 /* Make sure at least the header if available. */
1218 if (buffer_len <= PART_ENCRYPTION_AES256_SIZE)
1220 NOTICE ("network plugin: parse_part_encr_aes256: "
1221 "Discarding short packet.");
1227 /* Copy the unencrypted information into `pea'. */
1228 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
1229 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
1231 /* Check the `part size'. */
1232 part_size = ntohs (pea.head.length);
1233 if ((part_size <= PART_ENCRYPTION_AES256_SIZE)
1234 || (part_size > buffer_len))
1236 NOTICE ("network plugin: parse_part_encr_aes256: "
1237 "Discarding part with invalid size.");
1241 /* Read the username */
1242 BUFFER_READ (&username_len, sizeof (username_len));
1243 username_len = ntohs (username_len);
1245 if ((username_len <= 0)
1246 || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1))))
1248 NOTICE ("network plugin: parse_part_encr_aes256: "
1249 "Discarding part with invalid username length.");
1253 assert (username_len > 0);
1254 pea.username = malloc (username_len + 1);
1255 if (pea.username == NULL)
1257 BUFFER_READ (pea.username, username_len);
1258 pea.username[username_len] = 0;
1260 /* Last but not least, the initialization vector */
1261 BUFFER_READ (pea.iv, sizeof (pea.iv));
1263 /* Make sure we are at the right position */
1264 assert (buffer_offset == (username_len +
1265 PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash)));
1267 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
1271 sfree (pea.username);
1275 payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len);
1276 assert (payload_len > 0);
1278 /* Decrypt the packet in-place */
1279 err = gcry_cipher_decrypt (cypher,
1280 buffer + buffer_offset,
1281 part_size - buffer_offset,
1282 /* in = */ NULL, /* in len = */ 0);
1285 sfree (pea.username);
1286 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
1287 gcry_strerror (err));
1292 BUFFER_READ (pea.hash, sizeof (pea.hash));
1294 /* Make sure we're at the right position - again */
1295 assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE));
1296 assert (buffer_offset == (part_size - payload_len));
1298 /* Check hash sum */
1299 memset (hash, 0, sizeof (hash));
1300 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
1301 buffer + buffer_offset, payload_len);
1302 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
1304 sfree (pea.username);
1305 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
1309 parse_packet (se, buffer + buffer_offset, payload_len,
1310 flags | PP_ENCRYPTED, pea.username);
1312 /* XXX: Free pea.username?!? */
1314 /* Update return values */
1315 *ret_buffer = buffer + part_size;
1316 *ret_buffer_len = buffer_len - part_size;
1318 sfree (pea.username);
1321 } /* }}} int parse_part_encr_aes256 */
1322 /* #endif HAVE_LIBGCRYPT */
1324 #else /* if !HAVE_LIBGCRYPT */
1325 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1326 void **ret_buffer, size_t *ret_buffer_size, int flags)
1328 static int warning_has_been_printed = 0;
1332 size_t buffer_offset;
1337 buffer = *ret_buffer;
1338 buffer_size = *ret_buffer_size;
1341 /* parse_packet assures this minimum size. */
1342 assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length)));
1344 BUFFER_READ (&ph.type, sizeof (ph.type));
1345 BUFFER_READ (&ph.length, sizeof (ph.length));
1346 ph_length = ntohs (ph.length);
1348 if ((ph_length <= PART_ENCRYPTION_AES256_SIZE)
1349 || (ph_length > buffer_size))
1351 ERROR ("network plugin: AES-256 encrypted part "
1352 "with invalid length received.");
1356 if (warning_has_been_printed == 0)
1358 WARNING ("network plugin: Received encrypted packet, but the network "
1359 "plugin was not linked with libgcrypt, so I cannot "
1360 "decrypt it. The part will be discarded.");
1361 warning_has_been_printed = 1;
1364 *ret_buffer += ph_length;
1365 *ret_buffer_size -= ph_length;
1368 } /* }}} int parse_part_encr_aes256 */
1369 #endif /* !HAVE_LIBGCRYPT */
1373 static int parse_packet (sockent_t *se, /* {{{ */
1374 void *buffer, size_t buffer_size, int flags,
1375 const char *username)
1379 value_list_t vl = VALUE_LIST_INIT;
1383 int packet_was_signed = (flags & PP_SIGNED);
1384 int packet_was_encrypted = (flags & PP_ENCRYPTED);
1385 int printed_ignore_warning = 0;
1386 #endif /* HAVE_LIBGCRYPT */
1389 memset (&vl, '\0', sizeof (vl));
1390 memset (&n, '\0', sizeof (n));
1393 while ((status == 0) && (0 < buffer_size)
1394 && ((unsigned int) buffer_size > sizeof (part_header_t)))
1396 uint16_t pkg_length;
1399 memcpy ((void *) &pkg_type,
1402 memcpy ((void *) &pkg_length,
1403 (void *) (buffer + sizeof (pkg_type)),
1404 sizeof (pkg_length));
1406 pkg_length = ntohs (pkg_length);
1407 pkg_type = ntohs (pkg_type);
1409 if (pkg_length > buffer_size)
1411 /* Ensure that this loop terminates eventually */
1412 if (pkg_length < (2 * sizeof (uint16_t)))
1415 if (pkg_type == TYPE_ENCR_AES256)
1417 status = parse_part_encr_aes256 (se,
1418 &buffer, &buffer_size, flags);
1421 ERROR ("network plugin: Decrypting AES256 "
1423 "with status %i.", status);
1428 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
1429 && (packet_was_encrypted == 0))
1431 if (printed_ignore_warning == 0)
1433 INFO ("network plugin: Unencrypted packet or "
1434 "part has been ignored.");
1435 printed_ignore_warning = 1;
1437 buffer = ((char *) buffer) + pkg_length;
1438 buffer_size -= (size_t) pkg_length;
1441 #endif /* HAVE_LIBGCRYPT */
1442 else if (pkg_type == TYPE_SIGN_SHA256)
1444 status = parse_part_sign_sha256 (se,
1445 &buffer, &buffer_size, flags);
1448 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1450 "with status %i.", status);
1455 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
1456 && (packet_was_encrypted == 0)
1457 && (packet_was_signed == 0))
1459 if (printed_ignore_warning == 0)
1461 INFO ("network plugin: Unsigned packet or "
1462 "part has been ignored.");
1463 printed_ignore_warning = 1;
1465 buffer = ((char *) buffer) + pkg_length;
1466 buffer_size -= (size_t) pkg_length;
1469 #endif /* HAVE_LIBGCRYPT */
1470 else if (pkg_type == TYPE_VALUES)
1472 status = parse_part_values (&buffer, &buffer_size,
1473 &vl.values, &vl.values_len);
1477 network_dispatch_values (&vl, username);
1481 else if (pkg_type == TYPE_TIME)
1484 status = parse_part_number (&buffer, &buffer_size,
1488 vl.time = TIME_T_TO_CDTIME_T (tmp);
1489 n.time = TIME_T_TO_CDTIME_T (tmp);
1492 else if (pkg_type == TYPE_TIME_HR)
1495 status = parse_part_number (&buffer, &buffer_size,
1499 vl.time = (cdtime_t) tmp;
1500 n.time = (cdtime_t) tmp;
1503 else if (pkg_type == TYPE_INTERVAL)
1506 status = parse_part_number (&buffer, &buffer_size,
1509 vl.interval = TIME_T_TO_CDTIME_T (tmp);
1511 else if (pkg_type == TYPE_INTERVAL_HR)
1514 status = parse_part_number (&buffer, &buffer_size,
1517 vl.interval = (cdtime_t) tmp;
1519 else if (pkg_type == TYPE_HOST)
1521 status = parse_part_string (&buffer, &buffer_size,
1522 vl.host, sizeof (vl.host));
1524 sstrncpy (n.host, vl.host, sizeof (n.host));
1526 else if (pkg_type == TYPE_PLUGIN)
1528 status = parse_part_string (&buffer, &buffer_size,
1529 vl.plugin, sizeof (vl.plugin));
1531 sstrncpy (n.plugin, vl.plugin,
1534 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1536 status = parse_part_string (&buffer, &buffer_size,
1538 sizeof (vl.plugin_instance));
1540 sstrncpy (n.plugin_instance,
1542 sizeof (n.plugin_instance));
1544 else if (pkg_type == TYPE_TYPE)
1546 status = parse_part_string (&buffer, &buffer_size,
1547 vl.type, sizeof (vl.type));
1549 sstrncpy (n.type, vl.type, sizeof (n.type));
1551 else if (pkg_type == TYPE_TYPE_INSTANCE)
1553 status = parse_part_string (&buffer, &buffer_size,
1555 sizeof (vl.type_instance));
1557 sstrncpy (n.type_instance, vl.type_instance,
1558 sizeof (n.type_instance));
1560 else if (pkg_type == TYPE_MESSAGE)
1562 status = parse_part_string (&buffer, &buffer_size,
1563 n.message, sizeof (n.message));
1569 else if ((n.severity != NOTIF_FAILURE)
1570 && (n.severity != NOTIF_WARNING)
1571 && (n.severity != NOTIF_OKAY))
1573 INFO ("network plugin: "
1574 "Ignoring notification with "
1575 "unknown severity %i.",
1578 else if (n.time <= 0)
1580 INFO ("network plugin: "
1581 "Ignoring notification with "
1584 else if (strlen (n.message) <= 0)
1586 INFO ("network plugin: "
1587 "Ignoring notification with "
1588 "an empty message.");
1592 network_dispatch_notification (&n);
1595 else if (pkg_type == TYPE_SEVERITY)
1598 status = parse_part_number (&buffer, &buffer_size,
1601 n.severity = (int) tmp;
1605 DEBUG ("network plugin: parse_packet: Unknown part"
1606 " type: 0x%04hx", pkg_type);
1607 buffer = ((char *) buffer) + pkg_length;
1608 buffer_size -= (size_t) pkg_length;
1610 } /* while (buffer_size > sizeof (part_header_t)) */
1612 if (status == 0 && buffer_size > 0)
1613 WARNING ("network plugin: parse_packet: Received truncated "
1614 "packet, try increasing `MaxPacketSize'");
1617 } /* }}} int parse_packet */
1619 static void free_sockent_client (struct sockent_client *sec) /* {{{ */
1628 sfree (sec->username);
1629 sfree (sec->password);
1630 if (sec->cypher != NULL)
1631 gcry_cipher_close (sec->cypher);
1633 } /* }}} void free_sockent_client */
1635 static void free_sockent_server (struct sockent_server *ses) /* {{{ */
1639 for (i = 0; i < ses->fd_num; i++)
1641 if (ses->fd[i] >= 0)
1650 sfree (ses->auth_file);
1651 fbh_destroy (ses->userdb);
1652 if (ses->cypher != NULL)
1653 gcry_cipher_close (ses->cypher);
1655 } /* }}} void free_sockent_server */
1657 static void sockent_destroy (sockent_t *se) /* {{{ */
1661 DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se);
1668 sfree (se->service);
1670 if (se->type == SOCKENT_TYPE_CLIENT)
1671 free_sockent_client (&se->data.client);
1673 free_sockent_server (&se->data.server);
1678 } /* }}} void sockent_destroy */
1681 * int network_set_ttl
1683 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1684 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1686 * The `struct addrinfo' is used to destinguish between unicast and multicast
1689 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1691 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1692 network_config_ttl);
1694 assert (se->type == SOCKENT_TYPE_CLIENT);
1696 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1699 if (ai->ai_family == AF_INET)
1701 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1704 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1705 optname = IP_MULTICAST_TTL;
1709 if (setsockopt (se->data.client.fd, IPPROTO_IP, optname,
1710 &network_config_ttl,
1711 sizeof (network_config_ttl)) != 0)
1714 ERROR ("network plugin: setsockopt (ipv4-ttl): %s",
1715 sstrerror (errno, errbuf, sizeof (errbuf)));
1719 else if (ai->ai_family == AF_INET6)
1721 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1722 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1725 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1726 optname = IPV6_MULTICAST_HOPS;
1728 optname = IPV6_UNICAST_HOPS;
1730 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname,
1731 &network_config_ttl,
1732 sizeof (network_config_ttl)) != 0)
1735 ERROR ("network plugin: setsockopt(ipv6-ttl): %s",
1736 sstrerror (errno, errbuf,
1743 } /* int network_set_ttl */
1745 static int network_set_interface (const sockent_t *se, const struct addrinfo *ai) /* {{{ */
1747 DEBUG ("network plugin: network_set_interface: interface index = %i;",
1750 assert (se->type == SOCKENT_TYPE_CLIENT);
1752 if (ai->ai_family == AF_INET)
1754 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1756 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1758 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1759 /* If possible, use the "ip_mreqn" structure which has
1760 * an "interface index" member. Using the interface
1761 * index is preferred here, because of its similarity
1762 * to the way IPv6 handles this. Unfortunately, it
1763 * appears not to be portable. */
1764 struct ip_mreqn mreq;
1766 memset (&mreq, 0, sizeof (mreq));
1767 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1768 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
1769 mreq.imr_ifindex = se->interface;
1771 struct ip_mreq mreq;
1773 memset (&mreq, 0, sizeof (mreq));
1774 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1775 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
1778 if (setsockopt (se->data.client.fd, IPPROTO_IP, IP_MULTICAST_IF,
1779 &mreq, sizeof (mreq)) != 0)
1782 ERROR ("network plugin: setsockopt (ipv4-multicast-if): %s",
1783 sstrerror (errno, errbuf, sizeof (errbuf)));
1790 else if (ai->ai_family == AF_INET6)
1792 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1794 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1796 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
1798 sizeof (se->interface)) != 0)
1801 ERROR ("network plugin: setsockopt (ipv6-multicast-if): %s",
1802 sstrerror (errno, errbuf,
1811 /* else: Not a multicast interface. */
1812 if (se->interface != 0)
1814 #if defined(HAVE_IF_INDEXTONAME) && HAVE_IF_INDEXTONAME && defined(SO_BINDTODEVICE)
1815 char interface_name[IFNAMSIZ];
1817 if (if_indextoname (se->interface, interface_name) == NULL)
1820 DEBUG ("network plugin: Binding socket to interface %s", interface_name);
1822 if (setsockopt (se->data.client.fd, SOL_SOCKET, SO_BINDTODEVICE,
1824 sizeof(interface_name)) == -1 )
1827 ERROR ("network plugin: setsockopt (bind-if): %s",
1828 sstrerror (errno, errbuf, sizeof (errbuf)));
1831 /* #endif HAVE_IF_INDEXTONAME && SO_BINDTODEVICE */
1834 WARNING ("network plugin: Cannot set the interface on a unicast "
1836 # if !defined(SO_BINDTODEVICE)
1837 "the \"SO_BINDTODEVICE\" socket option "
1839 "the \"if_indextoname\" function "
1841 "is not available on your system.");
1847 } /* }}} network_set_interface */
1849 static int network_bind_socket (int fd, const struct addrinfo *ai, const int interface_idx)
1858 /* allow multiple sockets to use the same PORT number */
1859 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
1860 &yes, sizeof(yes)) == -1) {
1862 ERROR ("network plugin: setsockopt (reuseaddr): %s",
1863 sstrerror (errno, errbuf, sizeof (errbuf)));
1867 DEBUG ("fd = %i; calling `bind'", fd);
1869 if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1)
1873 sstrerror (errno, errbuf, sizeof (errbuf)));
1877 if (ai->ai_family == AF_INET)
1879 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1880 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1882 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1883 struct ip_mreqn mreq;
1885 struct ip_mreq mreq;
1888 DEBUG ("fd = %i; IPv4 multicast address found", fd);
1890 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1891 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1892 /* Set the interface using the interface index if
1893 * possible (available). Unfortunately, the struct
1894 * ip_mreqn is not portable. */
1895 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
1896 mreq.imr_ifindex = interface_idx;
1898 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
1901 if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1902 &loop, sizeof (loop)) == -1)
1905 ERROR ("network plugin: setsockopt (multicast-loop): %s",
1906 sstrerror (errno, errbuf,
1911 if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1912 &mreq, sizeof (mreq)) == -1)
1915 ERROR ("network plugin: setsockopt (add-membership): %s",
1916 sstrerror (errno, errbuf,
1924 else if (ai->ai_family == AF_INET6)
1926 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1927 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1928 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1930 struct ipv6_mreq mreq;
1932 DEBUG ("fd = %i; IPv6 multicast address found", fd);
1934 memcpy (&mreq.ipv6mr_multiaddr,
1936 sizeof (addr->sin6_addr));
1938 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1939 * ipv6mr_interface may be set to zeroes to
1940 * choose the default multicast interface or to
1941 * the index of a particular multicast-capable
1942 * interface if the host is multihomed.
1943 * Membership is associ-associated with a
1944 * single interface; programs running on
1945 * multihomed hosts may need to join the same
1946 * group on more than one interface.*/
1947 mreq.ipv6mr_interface = interface_idx;
1949 if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1950 &loop, sizeof (loop)) == -1)
1953 ERROR ("network plugin: setsockopt (ipv6-multicast-loop): %s",
1954 sstrerror (errno, errbuf,
1959 if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1960 &mreq, sizeof (mreq)) == -1)
1963 ERROR ("network plugin: setsockopt (ipv6-add-membership): %s",
1964 sstrerror (errno, errbuf,
1973 #if defined(HAVE_IF_INDEXTONAME) && HAVE_IF_INDEXTONAME && defined(SO_BINDTODEVICE)
1974 /* if a specific interface was set, bind the socket to it. But to avoid
1975 * possible problems with multicast routing, only do that for non-multicast
1977 if (interface_idx != 0)
1979 char interface_name[IFNAMSIZ];
1981 if (if_indextoname (interface_idx, interface_name) == NULL)
1984 DEBUG ("fd = %i; Binding socket to interface %s", fd, interface_name);
1986 if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
1988 sizeof(interface_name)) == -1 )
1991 ERROR ("network plugin: setsockopt (bind-if): %s",
1992 sstrerror (errno, errbuf, sizeof (errbuf)));
1996 #endif /* HAVE_IF_INDEXTONAME && SO_BINDTODEVICE */
1999 } /* int network_bind_socket */
2001 /* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT'
2002 * or `SOCKENT_TYPE_SERVER' */
2003 static sockent_t *sockent_create (int type) /* {{{ */
2007 if ((type != SOCKENT_TYPE_CLIENT) && (type != SOCKENT_TYPE_SERVER))
2010 se = malloc (sizeof (*se));
2013 memset (se, 0, sizeof (*se));
2021 if (type == SOCKENT_TYPE_SERVER)
2023 se->data.server.fd = NULL;
2024 se->data.server.fd_num = 0;
2026 se->data.server.security_level = SECURITY_LEVEL_NONE;
2027 se->data.server.auth_file = NULL;
2028 se->data.server.userdb = NULL;
2029 se->data.server.cypher = NULL;
2034 se->data.client.fd = -1;
2035 se->data.client.addr = NULL;
2037 se->data.client.security_level = SECURITY_LEVEL_NONE;
2038 se->data.client.username = NULL;
2039 se->data.client.password = NULL;
2040 se->data.client.cypher = NULL;
2045 } /* }}} sockent_t *sockent_create */
2047 static int sockent_init_crypto (sockent_t *se) /* {{{ */
2049 #if HAVE_LIBGCRYPT /* {{{ */
2050 if (se->type == SOCKENT_TYPE_CLIENT)
2052 if (se->data.client.security_level > SECURITY_LEVEL_NONE)
2054 network_init_gcrypt ();
2056 if ((se->data.client.username == NULL)
2057 || (se->data.client.password == NULL))
2059 ERROR ("network plugin: Client socket with "
2060 "security requested, but no "
2061 "credentials are configured.");
2064 gcry_md_hash_buffer (GCRY_MD_SHA256,
2065 se->data.client.password_hash,
2066 se->data.client.password,
2067 strlen (se->data.client.password));
2070 else /* (se->type == SOCKENT_TYPE_SERVER) */
2072 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
2074 network_init_gcrypt ();
2076 if (se->data.server.auth_file == NULL)
2078 ERROR ("network plugin: Server socket with "
2079 "security requested, but no "
2080 "password file is configured.");
2084 if (se->data.server.auth_file != NULL)
2086 se->data.server.userdb = fbh_create (se->data.server.auth_file);
2087 if (se->data.server.userdb == NULL)
2089 ERROR ("network plugin: Reading password file "
2091 se->data.server.auth_file);
2092 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
2097 #endif /* }}} HAVE_LIBGCRYPT */
2100 } /* }}} int sockent_init_crypto */
2102 static int sockent_client_connect (sockent_t *se) /* {{{ */
2104 static c_complain_t complaint = C_COMPLAIN_INIT_STATIC;
2106 struct sockent_client *client;
2107 struct addrinfo ai_hints;
2108 struct addrinfo *ai_list = NULL, *ai_ptr;
2111 if ((se == NULL) || (se->type != SOCKENT_TYPE_CLIENT))
2114 client = &se->data.client;
2115 if (client->fd >= 0) /* already connected */
2118 memset (&ai_hints, 0, sizeof (ai_hints));
2119 #ifdef AI_ADDRCONFIG
2120 ai_hints.ai_flags |= AI_ADDRCONFIG;
2122 ai_hints.ai_family = AF_UNSPEC;
2123 ai_hints.ai_socktype = SOCK_DGRAM;
2124 ai_hints.ai_protocol = IPPROTO_UDP;
2126 status = getaddrinfo (se->node,
2127 (se->service != NULL) ? se->service : NET_DEFAULT_PORT,
2128 &ai_hints, &ai_list);
2131 c_complain (LOG_ERR, &complaint,
2132 "network plugin: getaddrinfo (%s, %s) failed: %s",
2133 (se->node == NULL) ? "(null)" : se->node,
2134 (se->service == NULL) ? "(null)" : se->service,
2135 gai_strerror (status));
2140 c_release (LOG_NOTICE, &complaint,
2141 "network plugin: Successfully resolved \"%s\".",
2145 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2147 client->fd = socket (ai_ptr->ai_family,
2148 ai_ptr->ai_socktype,
2149 ai_ptr->ai_protocol);
2153 ERROR ("network plugin: socket(2) failed: %s",
2154 sstrerror (errno, errbuf,
2159 client->addr = malloc (sizeof (*client->addr));
2160 if (client->addr == NULL)
2162 ERROR ("network plugin: malloc failed.");
2168 memset (client->addr, 0, sizeof (*client->addr));
2169 assert (sizeof (*client->addr) >= ai_ptr->ai_addrlen);
2170 memcpy (client->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
2171 client->addrlen = ai_ptr->ai_addrlen;
2173 network_set_ttl (se, ai_ptr);
2174 network_set_interface (se, ai_ptr);
2176 /* We don't open more than one write-socket per
2177 * node/service pair.. */
2181 freeaddrinfo (ai_list);
2185 } /* }}} int sockent_client_connect */
2187 static int sockent_client_disconnect (sockent_t *se) /* {{{ */
2189 struct sockent_client *client;
2191 if ((se == NULL) || (se->type != SOCKENT_TYPE_CLIENT))
2194 client = &se->data.client;
2195 if (client->fd >= 0) /* connected */
2201 sfree (client->addr);
2202 client->addrlen = 0;
2205 } /* }}} int sockent_client_disconnect */
2207 /* Open the file descriptors for a initialized sockent structure. */
2208 static int sockent_server_listen (sockent_t *se) /* {{{ */
2210 struct addrinfo ai_hints;
2211 struct addrinfo *ai_list, *ai_ptr;
2215 const char *service;
2220 assert (se->data.server.fd == NULL);
2221 assert (se->data.server.fd_num == 0);
2224 service = se->service;
2226 if (service == NULL)
2227 service = NET_DEFAULT_PORT;
2229 DEBUG ("network plugin: sockent_server_listen: node = %s; service = %s;",
2232 memset (&ai_hints, 0, sizeof (ai_hints));
2233 ai_hints.ai_flags = 0;
2235 ai_hints.ai_flags |= AI_PASSIVE;
2237 #ifdef AI_ADDRCONFIG
2238 ai_hints.ai_flags |= AI_ADDRCONFIG;
2240 ai_hints.ai_family = AF_UNSPEC;
2241 ai_hints.ai_socktype = SOCK_DGRAM;
2242 ai_hints.ai_protocol = IPPROTO_UDP;
2244 status = getaddrinfo (node, service, &ai_hints, &ai_list);
2247 ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s",
2248 (se->node == NULL) ? "(null)" : se->node,
2249 (se->service == NULL) ? "(null)" : se->service,
2250 gai_strerror (status));
2254 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2258 tmp = realloc (se->data.server.fd,
2259 sizeof (*tmp) * (se->data.server.fd_num + 1));
2262 ERROR ("network plugin: realloc failed.");
2265 se->data.server.fd = tmp;
2266 tmp = se->data.server.fd + se->data.server.fd_num;
2268 *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
2269 ai_ptr->ai_protocol);
2273 ERROR ("network plugin: socket(2) failed: %s",
2274 sstrerror (errno, errbuf,
2279 status = network_bind_socket (*tmp, ai_ptr, se->interface);
2287 se->data.server.fd_num++;
2289 } /* for (ai_list) */
2291 freeaddrinfo (ai_list);
2293 if (se->data.server.fd_num <= 0)
2296 } /* }}} int sockent_server_listen */
2298 /* Add a sockent to the global list of sockets */
2299 static int sockent_add (sockent_t *se) /* {{{ */
2301 sockent_t *last_ptr;
2306 if (se->type == SOCKENT_TYPE_SERVER)
2311 tmp = realloc (listen_sockets_pollfd,
2312 sizeof (*tmp) * (listen_sockets_num
2313 + se->data.server.fd_num));
2316 ERROR ("network plugin: realloc failed.");
2319 listen_sockets_pollfd = tmp;
2320 tmp = listen_sockets_pollfd + listen_sockets_num;
2322 for (i = 0; i < se->data.server.fd_num; i++)
2324 memset (tmp + i, 0, sizeof (*tmp));
2325 tmp[i].fd = se->data.server.fd[i];
2326 tmp[i].events = POLLIN | POLLPRI;
2330 listen_sockets_num += se->data.server.fd_num;
2332 if (listen_sockets == NULL)
2334 listen_sockets = se;
2337 last_ptr = listen_sockets;
2339 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
2341 if (sending_sockets == NULL)
2343 sending_sockets = se;
2346 last_ptr = sending_sockets;
2349 while (last_ptr->next != NULL)
2350 last_ptr = last_ptr->next;
2351 last_ptr->next = se;
2354 } /* }}} int sockent_add */
2356 static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */
2360 receive_list_entry_t *ent;
2363 /* Lock and wait for more data to come in */
2364 pthread_mutex_lock (&receive_list_lock);
2365 while ((listen_loop == 0)
2366 && (receive_list_head == NULL))
2367 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
2369 /* Remove the head entry and unlock */
2370 ent = receive_list_head;
2372 receive_list_head = ent->next;
2373 receive_list_length--;
2374 pthread_mutex_unlock (&receive_list_lock);
2376 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
2377 * because we dispatch all missing packets before shutting down. */
2381 /* Look for the correct `sockent_t' */
2382 se = listen_sockets;
2387 for (i = 0; i < se->data.server.fd_num; i++)
2388 if (se->data.server.fd[i] == ent->fd)
2391 if (i < se->data.server.fd_num)
2399 ERROR ("network plugin: Got packet from FD %i, but can't "
2400 "find an appropriate socket entry.",
2407 parse_packet (se, ent->data, ent->data_len, /* flags = */ 0,
2408 /* username = */ NULL);
2414 } /* }}} void *dispatch_thread */
2416 static int network_receive (void) /* {{{ */
2418 char buffer[network_config_packet_size];
2424 receive_list_entry_t *private_list_head;
2425 receive_list_entry_t *private_list_tail;
2426 uint64_t private_list_length;
2428 assert (listen_sockets_num > 0);
2430 private_list_head = NULL;
2431 private_list_tail = NULL;
2432 private_list_length = 0;
2434 while (listen_loop == 0)
2436 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
2442 ERROR ("network plugin: poll(2) failed: %s",
2443 sstrerror (errno, errbuf, sizeof (errbuf)));
2447 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
2449 receive_list_entry_t *ent;
2451 if ((listen_sockets_pollfd[i].revents
2452 & (POLLIN | POLLPRI)) == 0)
2456 buffer_len = recv (listen_sockets_pollfd[i].fd,
2457 buffer, sizeof (buffer),
2462 status = (errno != 0) ? errno : -1;
2463 ERROR ("network plugin: recv(2) failed: %s",
2464 sstrerror (errno, errbuf, sizeof (errbuf)));
2468 stats_octets_rx += ((uint64_t) buffer_len);
2471 /* TODO: Possible performance enhancement: Do not free
2472 * these entries in the dispatch thread but put them in
2473 * another list, so we don't have to allocate more and
2474 * more of these structures. */
2475 ent = malloc (sizeof (receive_list_entry_t));
2478 ERROR ("network plugin: malloc failed.");
2482 memset (ent, 0, sizeof (receive_list_entry_t));
2483 ent->data = malloc (network_config_packet_size);
2484 if (ent->data == NULL)
2487 ERROR ("network plugin: malloc failed.");
2491 ent->fd = listen_sockets_pollfd[i].fd;
2494 memcpy (ent->data, buffer, buffer_len);
2495 ent->data_len = buffer_len;
2497 if (private_list_head == NULL)
2498 private_list_head = ent;
2500 private_list_tail->next = ent;
2501 private_list_tail = ent;
2502 private_list_length++;
2504 /* Do not block here. Blocking here has led to
2505 * insufficient performance in the past. */
2506 if (pthread_mutex_trylock (&receive_list_lock) == 0)
2508 assert (((receive_list_head == NULL) && (receive_list_length == 0))
2509 || ((receive_list_head != NULL) && (receive_list_length != 0)));
2511 if (receive_list_head == NULL)
2512 receive_list_head = private_list_head;
2514 receive_list_tail->next = private_list_head;
2515 receive_list_tail = private_list_tail;
2516 receive_list_length += private_list_length;
2518 pthread_cond_signal (&receive_list_cond);
2519 pthread_mutex_unlock (&receive_list_lock);
2521 private_list_head = NULL;
2522 private_list_tail = NULL;
2523 private_list_length = 0;
2527 } /* for (listen_sockets_pollfd) */
2531 } /* while (listen_loop == 0) */
2533 /* Make sure everything is dispatched before exiting. */
2534 if (private_list_head != NULL)
2536 pthread_mutex_lock (&receive_list_lock);
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);
2550 } /* }}} int network_receive */
2552 static void *receive_thread (void __attribute__((unused)) *arg)
2554 return (network_receive () ? (void *) 1 : (void *) 0);
2555 } /* void *receive_thread */
2557 static void network_init_buffer (void)
2559 memset (send_buffer, 0, network_config_packet_size);
2560 send_buffer_ptr = send_buffer;
2561 send_buffer_fill = 0;
2563 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
2564 } /* int network_init_buffer */
2566 static void networt_send_buffer_plain (sockent_t *se, /* {{{ */
2567 const char *buffer, size_t buffer_size)
2573 status = sockent_client_connect (se);
2577 status = sendto (se->data.client.fd, buffer, buffer_size,
2579 (struct sockaddr *) se->data.client.addr,
2580 se->data.client.addrlen);
2585 if ((errno == EINTR) || (errno == EAGAIN))
2588 ERROR ("network plugin: sendto failed: %s. Closing sending socket.",
2589 sstrerror (errno, errbuf, sizeof (errbuf)));
2590 sockent_client_disconnect (se);
2596 } /* }}} void networt_send_buffer_plain */
2599 #define BUFFER_ADD(p,s) do { \
2600 memcpy (buffer + buffer_offset, (p), (s)); \
2601 buffer_offset += (s); \
2604 static void networt_send_buffer_signed (sockent_t *se, /* {{{ */
2605 const char *in_buffer, size_t in_buffer_size)
2607 part_signature_sha256_t ps;
2608 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2609 size_t buffer_offset;
2610 size_t username_len;
2614 unsigned char *hash;
2617 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
2620 ERROR ("network plugin: Creating HMAC object failed: %s",
2621 gcry_strerror (err));
2625 err = gcry_md_setkey (hd, se->data.client.password,
2626 strlen (se->data.client.password));
2629 ERROR ("network plugin: gcry_md_setkey failed: %s",
2630 gcry_strerror (err));
2635 username_len = strlen (se->data.client.username);
2636 if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE))
2638 ERROR ("network plugin: Username too long: %s",
2639 se->data.client.username);
2643 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE,
2644 se->data.client.username, username_len);
2645 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len,
2646 in_buffer, in_buffer_size);
2648 /* Initialize the `ps' structure. */
2649 memset (&ps, 0, sizeof (ps));
2650 ps.head.type = htons (TYPE_SIGN_SHA256);
2651 ps.head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len);
2653 /* Calculate the hash value. */
2654 gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE,
2655 username_len + in_buffer_size);
2656 hash = gcry_md_read (hd, GCRY_MD_SHA256);
2659 ERROR ("network plugin: gcry_md_read failed.");
2663 memcpy (ps.hash, hash, sizeof (ps.hash));
2665 /* Add the header */
2668 BUFFER_ADD (&ps.head.type, sizeof (ps.head.type));
2669 BUFFER_ADD (&ps.head.length, sizeof (ps.head.length));
2670 BUFFER_ADD (ps.hash, sizeof (ps.hash));
2672 assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE);
2677 buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size;
2678 networt_send_buffer_plain (se, buffer, buffer_offset);
2679 } /* }}} void networt_send_buffer_signed */
2681 static void networt_send_buffer_encrypted (sockent_t *se, /* {{{ */
2682 const char *in_buffer, size_t in_buffer_size)
2684 part_encryption_aes256_t pea;
2685 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2687 size_t buffer_offset;
2689 size_t username_len;
2691 gcry_cipher_hd_t cypher;
2693 /* Initialize the header fields */
2694 memset (&pea, 0, sizeof (pea));
2695 pea.head.type = htons (TYPE_ENCR_AES256);
2697 pea.username = se->data.client.username;
2699 username_len = strlen (pea.username);
2700 if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE)
2702 ERROR ("network plugin: Username too long: %s", pea.username);
2706 buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size;
2707 header_size = PART_ENCRYPTION_AES256_SIZE + username_len
2708 - sizeof (pea.hash);
2710 assert (buffer_size <= sizeof (buffer));
2711 DEBUG ("network plugin: networt_send_buffer_encrypted: "
2712 "buffer_size = %zu;", buffer_size);
2714 pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE
2715 + username_len + in_buffer_size));
2716 pea.username_length = htons ((uint16_t) username_len);
2718 /* Chose a random initialization vector. */
2719 gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2721 /* Create hash of the payload */
2722 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2724 /* Initialize the buffer */
2726 memset (buffer, 0, sizeof (buffer));
2729 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2730 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2731 BUFFER_ADD (&pea.username_length, sizeof (pea.username_length));
2732 BUFFER_ADD (pea.username, username_len);
2733 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2734 assert (buffer_offset == header_size);
2735 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2736 BUFFER_ADD (in_buffer, in_buffer_size);
2738 assert (buffer_offset == buffer_size);
2740 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
2741 se->data.client.password);
2745 /* Encrypt the buffer in-place */
2746 err = gcry_cipher_encrypt (cypher,
2747 buffer + header_size,
2748 buffer_size - header_size,
2749 /* in = */ NULL, /* in len = */ 0);
2752 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2753 gcry_strerror (err));
2757 /* Send it out without further modifications */
2758 networt_send_buffer_plain (se, buffer, buffer_size);
2759 } /* }}} void networt_send_buffer_encrypted */
2761 #endif /* HAVE_LIBGCRYPT */
2763 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2767 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2769 for (se = sending_sockets; se != NULL; se = se->next)
2772 if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT)
2773 networt_send_buffer_encrypted (se, buffer, buffer_len);
2774 else if (se->data.client.security_level == SECURITY_LEVEL_SIGN)
2775 networt_send_buffer_signed (se, buffer, buffer_len);
2776 else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */
2777 #endif /* HAVE_LIBGCRYPT */
2778 networt_send_buffer_plain (se, buffer, buffer_len);
2779 } /* for (sending_sockets) */
2780 } /* }}} void network_send_buffer */
2782 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
2783 value_list_t *vl_def,
2784 const data_set_t *ds, const value_list_t *vl)
2786 char *buffer_orig = buffer;
2788 if (strcmp (vl_def->host, vl->host) != 0)
2790 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2791 vl->host, strlen (vl->host)) != 0)
2793 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2796 if (vl_def->time != vl->time)
2798 if (write_part_number (&buffer, &buffer_size, TYPE_TIME_HR,
2799 (uint64_t) vl->time))
2801 vl_def->time = vl->time;
2804 if (vl_def->interval != vl->interval)
2806 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL_HR,
2807 (uint64_t) vl->interval))
2809 vl_def->interval = vl->interval;
2812 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2814 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2815 vl->plugin, strlen (vl->plugin)) != 0)
2817 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2820 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2822 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2823 vl->plugin_instance,
2824 strlen (vl->plugin_instance)) != 0)
2826 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2829 if (strcmp (vl_def->type, vl->type) != 0)
2831 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2832 vl->type, strlen (vl->type)) != 0)
2834 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2837 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2839 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2841 strlen (vl->type_instance)) != 0)
2843 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2846 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2849 return (buffer - buffer_orig);
2850 } /* }}} int add_to_buffer */
2852 static void flush_buffer (void)
2854 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2857 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2859 stats_octets_tx += ((uint64_t) send_buffer_fill);
2862 network_init_buffer ();
2865 static int network_write (const data_set_t *ds, const value_list_t *vl,
2866 user_data_t __attribute__((unused)) *user_data)
2870 if (!check_send_okay (vl))
2873 char name[6*DATA_MAX_NAME_LEN];
2874 FORMAT_VL (name, sizeof (name), vl);
2875 name[sizeof (name) - 1] = 0;
2876 DEBUG ("network plugin: network_write: "
2877 "NOT sending %s.", name);
2879 /* Counter is not protected by another lock and may be reached by
2880 * multiple threads */
2881 pthread_mutex_lock (&stats_lock);
2882 stats_values_not_sent++;
2883 pthread_mutex_unlock (&stats_lock);
2887 uc_meta_data_add_unsigned_int (vl,
2888 "network:time_sent", (uint64_t) vl->time);
2890 pthread_mutex_lock (&send_buffer_lock);
2892 status = add_to_buffer (send_buffer_ptr,
2893 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2898 /* status == bytes added to the buffer */
2899 send_buffer_fill += status;
2900 send_buffer_ptr += status;
2902 stats_values_sent++;
2908 status = add_to_buffer (send_buffer_ptr,
2909 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2915 send_buffer_fill += status;
2916 send_buffer_ptr += status;
2918 stats_values_sent++;
2924 ERROR ("network plugin: Unable to append to the "
2925 "buffer for some weird reason");
2927 else if ((network_config_packet_size - send_buffer_fill) < 15)
2932 pthread_mutex_unlock (&send_buffer_lock);
2934 return ((status < 0) ? -1 : 0);
2935 } /* int network_write */
2937 static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
2940 if ((ci->values_num != 1)
2941 || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
2942 && (ci->values[0].type != OCONFIG_TYPE_STRING)))
2944 ERROR ("network plugin: The `%s' config option needs "
2945 "exactly one boolean argument.", ci->key);
2949 if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
2951 if (ci->values[0].value.boolean)
2958 char *str = ci->values[0].value.string;
2962 else if (IS_FALSE (str))
2966 ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
2967 "option as boolean value.",
2974 } /* }}} int network_config_set_boolean */
2976 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2979 if ((ci->values_num != 1)
2980 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2982 WARNING ("network plugin: The `TimeToLive' config option needs exactly "
2983 "one numeric argument.");
2987 tmp = (int) ci->values[0].value.number;
2988 if ((tmp > 0) && (tmp <= 255))
2989 network_config_ttl = tmp;
2991 WARNING ("network plugin: The `TimeToLive' must be between 1 and 255.");
2996 } /* }}} int network_config_set_ttl */
2998 static int network_config_set_interface (const oconfig_item_t *ci, /* {{{ */
3001 if ((ci->values_num != 1)
3002 || (ci->values[0].type != OCONFIG_TYPE_STRING))
3004 WARNING ("network plugin: The `Interface' config option needs exactly "
3005 "one string argument.");
3009 if (interface == NULL)
3012 *interface = if_nametoindex (ci->values[0].value.string);
3015 } /* }}} int network_config_set_interface */
3017 static int network_config_set_buffer_size (const oconfig_item_t *ci) /* {{{ */
3020 if ((ci->values_num != 1)
3021 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
3023 WARNING ("network plugin: The `MaxPacketSize' config option needs exactly "
3024 "one numeric argument.");
3028 tmp = (int) ci->values[0].value.number;
3029 if ((tmp >= 1024) && (tmp <= 65535))
3030 network_config_packet_size = tmp;
3033 } /* }}} int network_config_set_buffer_size */
3036 static int network_config_set_string (const oconfig_item_t *ci, /* {{{ */
3040 if ((ci->values_num != 1)
3041 || (ci->values[0].type != OCONFIG_TYPE_STRING))
3043 WARNING ("network plugin: The `%s' config option needs exactly "
3044 "one string argument.", ci->key);
3048 tmp = strdup (ci->values[0].value.string);
3052 sfree (*ret_string);
3056 } /* }}} int network_config_set_string */
3057 #endif /* HAVE_LIBGCRYPT */
3060 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
3064 if ((ci->values_num != 1)
3065 || (ci->values[0].type != OCONFIG_TYPE_STRING))
3067 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
3068 "one string argument.");
3072 str = ci->values[0].value.string;
3073 if (strcasecmp ("Encrypt", str) == 0)
3074 *retval = SECURITY_LEVEL_ENCRYPT;
3075 else if (strcasecmp ("Sign", str) == 0)
3076 *retval = SECURITY_LEVEL_SIGN;
3077 else if (strcasecmp ("None", str) == 0)
3078 *retval = SECURITY_LEVEL_NONE;
3081 WARNING ("network plugin: Unknown security level: %s.", str);
3086 } /* }}} int network_config_set_security_level */
3087 #endif /* HAVE_LIBGCRYPT */
3089 static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */
3095 if ((ci->values_num < 1) || (ci->values_num > 2)
3096 || (ci->values[0].type != OCONFIG_TYPE_STRING)
3097 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
3099 ERROR ("network plugin: The `%s' config option needs "
3100 "one or two string arguments.", ci->key);
3104 se = sockent_create (SOCKENT_TYPE_SERVER);
3107 ERROR ("network plugin: sockent_create failed.");
3111 se->node = strdup (ci->values[0].value.string);
3112 if (ci->values_num >= 2)
3113 se->service = strdup (ci->values[1].value.string);
3115 for (i = 0; i < ci->children_num; i++)
3117 oconfig_item_t *child = ci->children + i;
3120 if (strcasecmp ("AuthFile", child->key) == 0)
3121 network_config_set_string (child, &se->data.server.auth_file);
3122 else if (strcasecmp ("SecurityLevel", child->key) == 0)
3123 network_config_set_security_level (child,
3124 &se->data.server.security_level);
3126 #endif /* HAVE_LIBGCRYPT */
3127 if (strcasecmp ("Interface", child->key) == 0)
3128 network_config_set_interface (child,
3132 WARNING ("network plugin: Option `%s' is not allowed here.",
3138 if ((se->data.server.security_level > SECURITY_LEVEL_NONE)
3139 && (se->data.server.auth_file == NULL))
3141 ERROR ("network plugin: A security level higher than `none' was "
3142 "requested, but no AuthFile option was given. Cowardly refusing to "
3143 "open this socket!");
3144 sockent_destroy (se);
3147 #endif /* HAVE_LIBGCRYPT */
3149 status = sockent_init_crypto (se);
3152 ERROR ("network plugin: network_config_add_listen: sockent_init_crypto() failed.");
3153 sockent_destroy (se);
3157 status = sockent_server_listen (se);
3160 ERROR ("network plugin: network_config_add_server: sockent_server_listen failed.");
3161 sockent_destroy (se);
3165 status = sockent_add (se);
3168 ERROR ("network plugin: network_config_add_listen: sockent_add failed.");
3169 sockent_destroy (se);
3174 } /* }}} int network_config_add_listen */
3176 static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */
3182 if ((ci->values_num < 1) || (ci->values_num > 2)
3183 || (ci->values[0].type != OCONFIG_TYPE_STRING)
3184 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
3186 ERROR ("network plugin: The `%s' config option needs "
3187 "one or two string arguments.", ci->key);
3191 se = sockent_create (SOCKENT_TYPE_CLIENT);
3194 ERROR ("network plugin: sockent_create failed.");
3198 se->node = strdup (ci->values[0].value.string);
3199 if (ci->values_num >= 2)
3200 se->service = strdup (ci->values[1].value.string);
3202 for (i = 0; i < ci->children_num; i++)
3204 oconfig_item_t *child = ci->children + i;
3207 if (strcasecmp ("Username", child->key) == 0)
3208 network_config_set_string (child, &se->data.client.username);
3209 else if (strcasecmp ("Password", child->key) == 0)
3210 network_config_set_string (child, &se->data.client.password);
3211 else if (strcasecmp ("SecurityLevel", child->key) == 0)
3212 network_config_set_security_level (child,
3213 &se->data.client.security_level);
3215 #endif /* HAVE_LIBGCRYPT */
3216 if (strcasecmp ("Interface", child->key) == 0)
3217 network_config_set_interface (child,
3221 WARNING ("network plugin: Option `%s' is not allowed here.",
3227 if ((se->data.client.security_level > SECURITY_LEVEL_NONE)
3228 && ((se->data.client.username == NULL)
3229 || (se->data.client.password == NULL)))
3231 ERROR ("network plugin: A security level higher than `none' was "
3232 "requested, but no Username or Password option was given. "
3233 "Cowardly refusing to open this socket!");
3234 sockent_destroy (se);
3237 #endif /* HAVE_LIBGCRYPT */
3239 status = sockent_init_crypto (se);
3242 ERROR ("network plugin: network_config_add_server: sockent_init_crypto() failed.");
3243 sockent_destroy (se);
3247 /* No call to sockent_client_connect() here -- it is called from
3248 * networt_send_buffer_plain(). */
3250 status = sockent_add (se);
3253 ERROR ("network plugin: network_config_add_server: sockent_add failed.");
3254 sockent_destroy (se);
3259 } /* }}} int network_config_add_server */
3261 static int network_config (oconfig_item_t *ci) /* {{{ */
3265 /* The options need to be applied first */
3266 for (i = 0; i < ci->children_num; i++)
3268 oconfig_item_t *child = ci->children + i;
3269 if (strcasecmp ("TimeToLive", child->key) == 0)
3270 network_config_set_ttl (child);
3273 for (i = 0; i < ci->children_num; i++)
3275 oconfig_item_t *child = ci->children + i;
3277 if (strcasecmp ("Listen", child->key) == 0)
3278 network_config_add_listen (child);
3279 else if (strcasecmp ("Server", child->key) == 0)
3280 network_config_add_server (child);
3281 else if (strcasecmp ("TimeToLive", child->key) == 0) {
3282 /* Handled earlier */
3284 else if (strcasecmp ("MaxPacketSize", child->key) == 0)
3285 network_config_set_buffer_size (child);
3286 else if (strcasecmp ("Forward", child->key) == 0)
3287 network_config_set_boolean (child, &network_config_forward);
3288 else if (strcasecmp ("ReportStats", child->key) == 0)
3289 network_config_set_boolean (child, &network_config_stats);
3292 WARNING ("network plugin: Option `%s' is not allowed here.",
3298 } /* }}} int network_config */
3300 static int network_notification (const notification_t *n,
3301 user_data_t __attribute__((unused)) *user_data)
3303 char buffer[network_config_packet_size];
3304 char *buffer_ptr = buffer;
3305 int buffer_free = sizeof (buffer);
3308 if (!check_send_notify_okay (n))
3311 memset (buffer, 0, sizeof (buffer));
3313 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME_HR,
3314 (uint64_t) n->time);
3318 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
3319 (uint64_t) n->severity);
3323 if (strlen (n->host) > 0)
3325 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
3326 n->host, strlen (n->host));
3331 if (strlen (n->plugin) > 0)
3333 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
3334 n->plugin, strlen (n->plugin));
3339 if (strlen (n->plugin_instance) > 0)
3341 status = write_part_string (&buffer_ptr, &buffer_free,
3342 TYPE_PLUGIN_INSTANCE,
3343 n->plugin_instance, strlen (n->plugin_instance));
3348 if (strlen (n->type) > 0)
3350 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
3351 n->type, strlen (n->type));
3356 if (strlen (n->type_instance) > 0)
3358 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
3359 n->type_instance, strlen (n->type_instance));
3364 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
3365 n->message, strlen (n->message));
3369 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
3372 } /* int network_notification */
3374 static int network_shutdown (void)
3380 /* Kill the listening thread */
3381 if (receive_thread_running != 0)
3383 INFO ("network plugin: Stopping receive thread.");
3384 pthread_kill (receive_thread_id, SIGTERM);
3385 pthread_join (receive_thread_id, NULL /* no return value */);
3386 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
3387 receive_thread_running = 0;
3390 /* Shutdown the dispatching thread */
3391 if (dispatch_thread_running != 0)
3393 INFO ("network plugin: Stopping dispatch thread.");
3394 pthread_mutex_lock (&receive_list_lock);
3395 pthread_cond_broadcast (&receive_list_cond);
3396 pthread_mutex_unlock (&receive_list_lock);
3397 pthread_join (dispatch_thread_id, /* ret = */ NULL);
3398 dispatch_thread_running = 0;
3401 sockent_destroy (listen_sockets);
3403 if (send_buffer_fill > 0)
3406 sfree (send_buffer);
3408 for (se = sending_sockets; se != NULL; se = se->next)
3409 sockent_client_disconnect (se);
3410 sockent_destroy (sending_sockets);
3412 plugin_unregister_config ("network");
3413 plugin_unregister_init ("network");
3414 plugin_unregister_write ("network");
3415 plugin_unregister_shutdown ("network");
3418 } /* int network_shutdown */
3420 static int network_stats_read (void) /* {{{ */
3422 derive_t copy_octets_rx;
3423 derive_t copy_octets_tx;
3424 derive_t copy_packets_rx;
3425 derive_t copy_packets_tx;
3426 derive_t copy_values_dispatched;
3427 derive_t copy_values_not_dispatched;
3428 derive_t copy_values_sent;
3429 derive_t copy_values_not_sent;
3430 derive_t copy_receive_list_length;
3431 value_list_t vl = VALUE_LIST_INIT;
3434 copy_octets_rx = stats_octets_rx;
3435 copy_octets_tx = stats_octets_tx;
3436 copy_packets_rx = stats_packets_rx;
3437 copy_packets_tx = stats_packets_tx;
3438 copy_values_dispatched = stats_values_dispatched;
3439 copy_values_not_dispatched = stats_values_not_dispatched;
3440 copy_values_sent = stats_values_sent;
3441 copy_values_not_sent = stats_values_not_sent;
3442 copy_receive_list_length = receive_list_length;
3444 /* Initialize `vl' */
3448 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
3449 sstrncpy (vl.plugin, "network", sizeof (vl.plugin));
3451 /* Octets received / sent */
3452 vl.values[0].derive = (derive_t) copy_octets_rx;
3453 vl.values[1].derive = (derive_t) copy_octets_tx;
3454 sstrncpy (vl.type, "if_octets", sizeof (vl.type));
3455 plugin_dispatch_values (&vl);
3457 /* Packets received / send */
3458 vl.values[0].derive = (derive_t) copy_packets_rx;
3459 vl.values[1].derive = (derive_t) copy_packets_tx;
3460 sstrncpy (vl.type, "if_packets", sizeof (vl.type));
3461 plugin_dispatch_values (&vl);
3463 /* Values (not) dispatched and (not) send */
3464 sstrncpy (vl.type, "total_values", sizeof (vl.type));
3467 vl.values[0].derive = (derive_t) copy_values_dispatched;
3468 sstrncpy (vl.type_instance, "dispatch-accepted",
3469 sizeof (vl.type_instance));
3470 plugin_dispatch_values (&vl);
3472 vl.values[0].derive = (derive_t) copy_values_not_dispatched;
3473 sstrncpy (vl.type_instance, "dispatch-rejected",
3474 sizeof (vl.type_instance));
3475 plugin_dispatch_values (&vl);
3477 vl.values[0].derive = (derive_t) copy_values_sent;
3478 sstrncpy (vl.type_instance, "send-accepted",
3479 sizeof (vl.type_instance));
3480 plugin_dispatch_values (&vl);
3482 vl.values[0].derive = (derive_t) copy_values_not_sent;
3483 sstrncpy (vl.type_instance, "send-rejected",
3484 sizeof (vl.type_instance));
3485 plugin_dispatch_values (&vl);
3487 /* Receive queue length */
3488 vl.values[0].gauge = (gauge_t) copy_receive_list_length;
3489 sstrncpy (vl.type, "queue_length", sizeof (vl.type));
3490 vl.type_instance[0] = 0;
3491 plugin_dispatch_values (&vl);
3494 } /* }}} int network_stats_read */
3496 static int network_init (void)
3498 static _Bool have_init = 0;
3500 /* Check if we were already initialized. If so, just return - there's
3501 * nothing more to do (for now, that is). */
3507 network_init_gcrypt ();
3510 if (network_config_stats != 0)
3511 plugin_register_read ("network", network_stats_read);
3513 plugin_register_shutdown ("network", network_shutdown);
3515 send_buffer = malloc (network_config_packet_size);
3516 if (send_buffer == NULL)
3518 ERROR ("network plugin: malloc failed.");
3521 network_init_buffer ();
3523 /* setup socket(s) and so on */
3524 if (sending_sockets != NULL)
3526 plugin_register_write ("network", network_write,
3527 /* user_data = */ NULL);
3528 plugin_register_notification ("network", network_notification,
3529 /* user_data = */ NULL);
3532 /* If no threads need to be started, return here. */
3533 if ((listen_sockets_num == 0)
3534 || ((dispatch_thread_running != 0)
3535 && (receive_thread_running != 0)))
3538 if (dispatch_thread_running == 0)
3541 status = plugin_thread_create (&dispatch_thread_id,
3542 NULL /* no attributes */,
3544 NULL /* no argument */);
3548 ERROR ("network: pthread_create failed: %s",
3549 sstrerror (errno, errbuf,
3554 dispatch_thread_running = 1;
3558 if (receive_thread_running == 0)
3561 status = plugin_thread_create (&receive_thread_id,
3562 NULL /* no attributes */,
3564 NULL /* no argument */);
3568 ERROR ("network: pthread_create failed: %s",
3569 sstrerror (errno, errbuf,
3574 receive_thread_running = 1;
3579 } /* int network_init */
3582 * The flush option of the network plugin cannot flush individual identifiers.
3583 * All the values are added to a buffer and sent when the buffer is full, the
3584 * requested value may or may not be in there, it's not worth finding out. We
3585 * just send the buffer if `flush' is called - if the requested value was in
3586 * there, good. If not, well, then there is nothing to flush.. -octo
3588 static int network_flush (__attribute__((unused)) cdtime_t timeout,
3589 __attribute__((unused)) const char *identifier,
3590 __attribute__((unused)) user_data_t *user_data)
3592 pthread_mutex_lock (&send_buffer_lock);
3594 if (send_buffer_fill > 0)
3597 pthread_mutex_unlock (&send_buffer_lock);
3600 } /* int network_flush */
3602 void module_register (void)
3604 plugin_register_complex_config ("network", network_config);
3605 plugin_register_init ("network", network_init);
3606 plugin_register_flush ("network", network_flush,
3607 /* user_data = */ NULL);
3608 } /* void module_register */
3610 /* vim: set fdm=marker : */