2 * collectd - src/network.c
3 * Copyright (C) 2005-2008 Florian octo Forster
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Florian octo Forster <octo at verplant.org>
25 #include "configfile.h"
26 #include "utils_avltree.h"
34 # include <sys/socket.h>
40 # include <netinet/in.h>
43 # include <arpa/inet.h>
49 /* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */
50 /* #define BUFF_SIZE 1452 */
52 #ifndef IPV6_ADD_MEMBERSHIP
53 # ifdef IPV6_JOIN_GROUP
54 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
56 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
58 #endif /* !IP_ADD_MEMBERSHIP */
60 #define BUFF_SIZE 1024
65 typedef struct sockent
68 struct sockaddr_storage *addr;
73 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
74 * 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
75 * +-------+-----------------------+-------------------------------+
77 * +-------+-----------------------+-------------------------------+
84 typedef struct part_header_s part_header_t;
86 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
87 * 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
88 * +-------------------------------+-------------------------------+
90 * +-------------------------------+-------------------------------+
91 * : (Length - 4) Bytes :
92 * +---------------------------------------------------------------+
99 typedef struct part_string_s part_string_t;
101 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
102 * 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
103 * +-------------------------------+-------------------------------+
105 * +-------------------------------+-------------------------------+
106 * : (Length - 4 == 2 || 4 || 8) Bytes :
107 * +---------------------------------------------------------------+
114 typedef struct part_number_s part_number_t;
116 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
117 * 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
118 * +-------------------------------+-------------------------------+
120 * +-------------------------------+---------------+---------------+
121 * ! Num of values ! Type0 ! Type1 !
122 * +-------------------------------+---------------+---------------+
125 * +---------------------------------------------------------------+
128 * +---------------------------------------------------------------+
133 uint16_t *num_values;
134 uint8_t *values_types;
137 typedef struct part_values_s part_values_t;
139 struct receive_list_entry_s
141 char data[BUFF_SIZE];
143 struct receive_list_entry_s *next;
145 typedef struct receive_list_entry_s receive_list_entry_t;
150 static const char *config_keys[] =
158 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
160 static int network_config_ttl = 0;
161 static int network_config_forward = 0;
163 static sockent_t *sending_sockets = NULL;
165 static receive_list_entry_t *receive_list_head = NULL;
166 static receive_list_entry_t *receive_list_tail = NULL;
167 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
168 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
170 static struct pollfd *listen_sockets = NULL;
171 static int listen_sockets_num = 0;
173 static int listen_loop = 0;
174 static pthread_t receive_thread_id = 0;
175 static pthread_t dispatch_thread_id = 0;
177 static char send_buffer[BUFF_SIZE];
178 static char *send_buffer_ptr;
179 static int send_buffer_fill;
180 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
181 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
183 static c_avl_tree_t *cache_tree = NULL;
184 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
185 static time_t cache_flush_last = 0;
186 static int cache_flush_interval = 1800;
191 static int cache_flush (void)
201 c_avl_iterator_t *iter;
203 time_t curtime = time (NULL);
205 iter = c_avl_get_iterator (cache_tree);
206 while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
208 if ((curtime - *value) <= cache_flush_interval)
210 tmp = (char **) realloc (keys,
211 (keys_num + 1) * sizeof (char *));
215 c_avl_iterator_destroy (iter);
216 ERROR ("network plugin: cache_flush: realloc"
221 keys[keys_num] = key;
223 } /* while (c_avl_iterator_next) */
224 c_avl_iterator_destroy (iter);
226 for (i = 0; i < keys_num; i++)
228 if (c_avl_remove (cache_tree, keys[i], (void *) &key,
229 (void *) &value) != 0)
231 WARNING ("network plugin: cache_flush: c_avl_remove"
232 " (%s) failed.", keys[i]);
242 DEBUG ("network plugin: cache_flush: Removed %i %s",
243 keys_num, (keys_num == 1) ? "entry" : "entries");
244 cache_flush_last = curtime;
246 } /* int cache_flush */
248 static int cache_check (const value_list_t *vl)
251 time_t *value = NULL;
254 if (cache_tree == NULL)
257 if (format_name (key, sizeof (key), vl->host, vl->plugin,
258 vl->plugin_instance, vl->type, vl->type_instance))
261 pthread_mutex_lock (&cache_lock);
263 if (c_avl_get (cache_tree, key, (void *) &value) == 0)
265 if (*value < vl->time)
272 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
273 (int) *value, (int) vl->time);
279 char *key_copy = strdup (key);
280 value = malloc (sizeof (time_t));
281 if ((key_copy != NULL) && (value != NULL))
284 c_avl_insert (cache_tree, key_copy, value);
294 if ((time (NULL) - cache_flush_last) > cache_flush_interval)
297 pthread_mutex_unlock (&cache_lock);
299 DEBUG ("network plugin: cache_check: key = %s; time = %i; retval = %i",
300 key, (int) vl->time, retval);
303 } /* int cache_check */
305 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
306 const data_set_t *ds, const value_list_t *vl)
312 part_header_t pkg_ph;
313 uint16_t pkg_num_values;
314 uint8_t *pkg_values_types;
320 num_values = vl->values_len;
321 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
322 + (num_values * sizeof (uint8_t))
323 + (num_values * sizeof (value_t));
325 if (*ret_buffer_len < packet_len)
328 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
329 if (pkg_values_types == NULL)
331 ERROR ("network plugin: write_part_values: malloc failed.");
335 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
336 if (pkg_values == NULL)
338 free (pkg_values_types);
339 ERROR ("network plugin: write_part_values: malloc failed.");
343 pkg_ph.type = htons (TYPE_VALUES);
344 pkg_ph.length = htons (packet_len);
346 pkg_num_values = htons ((uint16_t) vl->values_len);
348 for (i = 0; i < num_values; i++)
350 if (ds->ds[i].type == DS_TYPE_COUNTER)
352 pkg_values_types[i] = DS_TYPE_COUNTER;
353 pkg_values[i].counter = htonll (vl->values[i].counter);
357 pkg_values_types[i] = DS_TYPE_GAUGE;
358 pkg_values[i].gauge = htond (vl->values[i].gauge);
363 * Use `memcpy' to write everything to the buffer, because the pointer
364 * may be unaligned and some architectures, such as SPARC, can't handle
367 packet_ptr = *ret_buffer;
369 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
370 offset += sizeof (pkg_ph);
371 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
372 offset += sizeof (pkg_num_values);
373 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
374 offset += num_values * sizeof (uint8_t);
375 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
376 offset += num_values * sizeof (value_t);
378 assert (offset == packet_len);
380 *ret_buffer = packet_ptr + packet_len;
381 *ret_buffer_len -= packet_len;
383 free (pkg_values_types);
387 } /* int write_part_values */
389 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
390 int type, uint64_t value)
395 part_header_t pkg_head;
400 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
402 if (*ret_buffer_len < packet_len)
405 pkg_head.type = htons (type);
406 pkg_head.length = htons (packet_len);
407 pkg_value = htonll (value);
409 packet_ptr = *ret_buffer;
411 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
412 offset += sizeof (pkg_head);
413 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
414 offset += sizeof (pkg_value);
416 assert (offset == packet_len);
418 *ret_buffer = packet_ptr + packet_len;
419 *ret_buffer_len -= packet_len;
422 } /* int write_part_number */
424 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
425 int type, const char *str, int str_len)
435 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
436 if (*ret_buffer_len < buffer_len)
439 pkg_type = htons (type);
440 pkg_length = htons (buffer_len);
442 buffer = *ret_buffer;
444 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
445 offset += sizeof (pkg_type);
446 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
447 offset += sizeof (pkg_length);
448 memcpy (buffer + offset, str, str_len);
450 memset (buffer + offset, '\0', 1);
453 assert (offset == buffer_len);
455 *ret_buffer = buffer + buffer_len;
456 *ret_buffer_len -= buffer_len;
459 } /* int write_part_string */
461 static int parse_part_values (void **ret_buffer, int *ret_buffer_len,
462 value_t **ret_values, int *ret_num_values)
464 char *buffer = *ret_buffer;
465 int buffer_len = *ret_buffer_len;
478 if (buffer_len < (15))
480 DEBUG ("network plugin: packet is too short: buffer_len = %i",
485 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
486 buffer += sizeof (tmp16);
487 pkg_type = ntohs (tmp16);
489 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
490 buffer += sizeof (tmp16);
491 pkg_length = ntohs (tmp16);
493 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
494 buffer += sizeof (tmp16);
495 pkg_numval = ntohs (tmp16);
497 assert (pkg_type == TYPE_VALUES);
499 exp_size = 3 * sizeof (uint16_t)
500 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
501 if (buffer_len < exp_size)
503 WARNING ("network plugin: parse_part_values: "
505 "Chunk of size %u expected, "
506 "but buffer has only %i bytes left.",
507 (unsigned int) exp_size, buffer_len);
511 if (pkg_length != exp_size)
513 WARNING ("network plugin: parse_part_values: "
514 "Length and number of values "
515 "in the packet don't match.");
519 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
520 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
521 if ((pkg_types == NULL) || (pkg_values == NULL))
525 ERROR ("network plugin: parse_part_values: malloc failed.");
529 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
530 buffer += pkg_numval * sizeof (uint8_t);
531 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
532 buffer += pkg_numval * sizeof (value_t);
534 for (i = 0; i < pkg_numval; i++)
536 if (pkg_types[i] == DS_TYPE_COUNTER)
537 pkg_values[i].counter = ntohll (pkg_values[i].counter);
538 else if (pkg_types[i] == DS_TYPE_GAUGE)
539 pkg_values[i].gauge = ntohd (pkg_values[i].gauge);
542 *ret_buffer = buffer;
543 *ret_buffer_len = buffer_len - pkg_length;
544 *ret_num_values = pkg_numval;
545 *ret_values = pkg_values;
550 } /* int parse_part_values */
552 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
555 char *buffer = *ret_buffer;
556 int buffer_len = *ret_buffer_len;
560 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
565 if (buffer_len < exp_size)
567 WARNING ("network plugin: parse_part_number: "
569 "Chunk of size %u expected, "
570 "but buffer has only %i bytes left.",
571 (unsigned int) exp_size, buffer_len);
575 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
576 buffer += sizeof (tmp16);
577 pkg_type = ntohs (tmp16);
579 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
580 buffer += sizeof (tmp16);
581 pkg_length = ntohs (tmp16);
583 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
584 buffer += sizeof (tmp64);
585 *value = ntohll (tmp64);
587 *ret_buffer = buffer;
588 *ret_buffer_len = buffer_len - pkg_length;
591 } /* int parse_part_number */
593 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
594 char *output, int output_len)
596 char *buffer = *ret_buffer;
597 int buffer_len = *ret_buffer_len;
600 size_t header_size = 2 * sizeof (uint16_t);
605 if (buffer_len < header_size)
607 WARNING ("network plugin: parse_part_string: "
609 "Chunk of at least size %u expected, "
610 "but buffer has only %i bytes left.",
611 (unsigned int) header_size, buffer_len);
615 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
616 buffer += sizeof (tmp16);
617 pkg_type = ntohs (tmp16);
619 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
620 buffer += sizeof (tmp16);
621 pkg_length = ntohs (tmp16);
623 /* Check that packet fits in the input buffer */
624 if (pkg_length > buffer_len)
626 WARNING ("network plugin: parse_part_string: "
628 "Chunk of size %hu received, "
629 "but buffer has only %i bytes left.",
630 pkg_length, buffer_len);
634 /* Check that pkg_length is in the valid range */
635 if (pkg_length <= header_size)
637 WARNING ("network plugin: parse_part_string: "
639 "Header claims this packet is only %hu "
640 "bytes long.", pkg_length);
644 /* Check that the package data fits into the output buffer.
645 * The previous if-statement ensures that:
646 * `pkg_length > header_size' */
647 if ((pkg_length - header_size) > output_len)
649 WARNING ("network plugin: parse_part_string: "
650 "Output buffer too small.");
654 /* All sanity checks successfull, let's copy the data over */
655 output_len = pkg_length - header_size;
656 memcpy ((void *) output, (void *) buffer, output_len);
657 buffer += output_len;
659 /* For some very weird reason '\0' doesn't do the trick on SPARC in
661 if (output[output_len - 1] != 0)
663 WARNING ("network plugin: parse_part_string: "
664 "Received string does not end "
665 "with a NULL-byte.");
669 *ret_buffer = buffer;
670 *ret_buffer_len = buffer_len - pkg_length;
673 } /* int parse_part_string */
675 static int parse_packet (void *buffer, int buffer_len)
679 value_list_t vl = VALUE_LIST_INIT;
682 DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
685 memset (&vl, '\0', sizeof (vl));
686 memset (&n, '\0', sizeof (n));
689 while ((status == 0) && (0 < buffer_len)
690 && ((unsigned int) buffer_len > sizeof (part_header_t)))
695 memcpy ((void *) &pkg_type,
698 memcpy ((void *) &pkg_length,
699 (void *) (buffer + sizeof (pkg_type)),
700 sizeof (pkg_length));
702 pkg_length = ntohs (pkg_length);
703 pkg_type = ntohs (pkg_type);
705 if (pkg_length > buffer_len)
707 /* Ensure that this loop terminates eventually */
708 if (pkg_length < (2 * sizeof (uint16_t)))
711 if (pkg_type == TYPE_VALUES)
713 status = parse_part_values (&buffer, &buffer_len,
714 &vl.values, &vl.values_len);
720 && (strlen (vl.host) > 0)
721 && (strlen (vl.plugin) > 0)
722 && (strlen (vl.type) > 0)
723 && (cache_check (&vl) == 0))
725 plugin_dispatch_values (&vl);
729 DEBUG ("network plugin: parse_packet:"
730 " NOT dispatching values");
735 else if (pkg_type == TYPE_TIME)
738 status = parse_part_number (&buffer, &buffer_len,
742 vl.time = (time_t) tmp;
743 n.time = (time_t) tmp;
746 else if (pkg_type == TYPE_INTERVAL)
749 status = parse_part_number (&buffer, &buffer_len,
752 vl.interval = (int) tmp;
754 else if (pkg_type == TYPE_HOST)
756 status = parse_part_string (&buffer, &buffer_len,
757 vl.host, sizeof (vl.host));
759 sstrncpy (n.host, vl.host, sizeof (n.host));
761 else if (pkg_type == TYPE_PLUGIN)
763 status = parse_part_string (&buffer, &buffer_len,
764 vl.plugin, sizeof (vl.plugin));
766 sstrncpy (n.plugin, vl.plugin,
769 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
771 status = parse_part_string (&buffer, &buffer_len,
773 sizeof (vl.plugin_instance));
775 sstrncpy (n.plugin_instance,
777 sizeof (n.plugin_instance));
779 else if (pkg_type == TYPE_TYPE)
781 status = parse_part_string (&buffer, &buffer_len,
782 vl.type, sizeof (vl.type));
784 sstrncpy (n.type, vl.type, sizeof (n.type));
786 else if (pkg_type == TYPE_TYPE_INSTANCE)
788 status = parse_part_string (&buffer, &buffer_len,
790 sizeof (vl.type_instance));
792 sstrncpy (n.type_instance, vl.type_instance,
793 sizeof (n.type_instance));
795 else if (pkg_type == TYPE_MESSAGE)
797 status = parse_part_string (&buffer, &buffer_len,
798 n.message, sizeof (n.message));
804 else if ((n.severity != NOTIF_FAILURE)
805 && (n.severity != NOTIF_WARNING)
806 && (n.severity != NOTIF_OKAY))
808 INFO ("network plugin: "
809 "Ignoring notification with "
810 "unknown severity %i.",
813 else if (n.time <= 0)
815 INFO ("network plugin: "
816 "Ignoring notification with "
819 else if (strlen (n.message) <= 0)
821 INFO ("network plugin: "
822 "Ignoring notification with "
823 "an empty message.");
827 plugin_dispatch_notification (&n);
830 else if (pkg_type == TYPE_SEVERITY)
833 status = parse_part_number (&buffer, &buffer_len,
836 n.severity = (int) tmp;
840 DEBUG ("network plugin: parse_packet: Unknown part"
841 " type: 0x%04hx", pkg_type);
842 buffer = ((char *) buffer) + pkg_length;
844 } /* while (buffer_len > sizeof (part_header_t)) */
847 } /* int parse_packet */
849 static void free_sockent (sockent_t *se)
859 } /* void free_sockent */
862 * int network_set_ttl
864 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
865 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
867 * The `struct addrinfo' is used to destinguish between unicast and multicast
870 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
872 if ((network_config_ttl < 1) || (network_config_ttl > 255))
875 DEBUG ("ttl = %i", network_config_ttl);
877 if (ai->ai_family == AF_INET)
879 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
882 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
883 optname = IP_MULTICAST_TTL;
887 if (setsockopt (se->fd, IPPROTO_IP, optname,
889 sizeof (network_config_ttl)) == -1)
892 ERROR ("setsockopt: %s",
893 sstrerror (errno, errbuf, sizeof (errbuf)));
897 else if (ai->ai_family == AF_INET6)
899 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
900 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
903 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
904 optname = IPV6_MULTICAST_HOPS;
906 optname = IPV6_UNICAST_HOPS;
908 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
910 sizeof (network_config_ttl)) == -1)
913 ERROR ("setsockopt: %s",
914 sstrerror (errno, errbuf,
921 } /* int network_set_ttl */
923 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
928 /* allow multiple sockets to use the same PORT number */
929 if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR,
930 &yes, sizeof(yes)) == -1) {
932 ERROR ("setsockopt: %s",
933 sstrerror (errno, errbuf, sizeof (errbuf)));
937 DEBUG ("fd = %i; calling `bind'", se->fd);
939 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
943 sstrerror (errno, errbuf, sizeof (errbuf)));
947 if (ai->ai_family == AF_INET)
949 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
950 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
954 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
956 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
957 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
959 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
960 &loop, sizeof (loop)) == -1)
963 ERROR ("setsockopt: %s",
964 sstrerror (errno, errbuf,
969 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
970 &mreq, sizeof (mreq)) == -1)
973 ERROR ("setsockopt: %s",
974 sstrerror (errno, errbuf,
980 else if (ai->ai_family == AF_INET6)
982 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
983 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
984 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
986 struct ipv6_mreq mreq;
988 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
990 memcpy (&mreq.ipv6mr_multiaddr,
992 sizeof (addr->sin6_addr));
994 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
995 * ipv6mr_interface may be set to zeroes to
996 * choose the default multicast interface or to
997 * the index of a particular multicast-capable
998 * interface if the host is multihomed.
999 * Membership is associ-associated with a
1000 * single interface; programs running on
1001 * multihomed hosts may need to join the same
1002 * group on more than one interface.*/
1003 mreq.ipv6mr_interface = 0;
1005 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1006 &loop, sizeof (loop)) == -1)
1009 ERROR ("setsockopt: %s",
1010 sstrerror (errno, errbuf,
1015 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1016 &mreq, sizeof (mreq)) == -1)
1019 ERROR ("setsockopt: %s",
1020 sstrerror (errno, errbuf,
1028 } /* int network_bind_socket */
1030 static sockent_t *network_create_socket (const char *node,
1031 const char *service,
1034 struct addrinfo ai_hints;
1035 struct addrinfo *ai_list, *ai_ptr;
1038 sockent_t *se_head = NULL;
1039 sockent_t *se_tail = NULL;
1041 DEBUG ("node = %s, service = %s", node, service);
1043 memset (&ai_hints, '\0', sizeof (ai_hints));
1044 ai_hints.ai_flags = 0;
1046 ai_hints.ai_flags |= AI_PASSIVE;
1048 #ifdef AI_ADDRCONFIG
1049 ai_hints.ai_flags |= AI_ADDRCONFIG;
1051 ai_hints.ai_family = AF_UNSPEC;
1052 ai_hints.ai_socktype = SOCK_DGRAM;
1053 ai_hints.ai_protocol = IPPROTO_UDP;
1055 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1059 ERROR ("getaddrinfo (%s, %s): %s",
1060 (node == NULL) ? "(null)" : node,
1061 (service == NULL) ? "(null)" : service,
1062 (ai_return == EAI_SYSTEM)
1063 ? sstrerror (errno, errbuf, sizeof (errbuf))
1064 : gai_strerror (ai_return));
1068 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1072 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
1075 ERROR ("malloc: %s",
1076 sstrerror (errno, errbuf,
1081 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
1084 ERROR ("malloc: %s",
1085 sstrerror (errno, errbuf,
1091 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1092 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
1093 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1094 se->addrlen = ai_ptr->ai_addrlen;
1096 se->fd = socket (ai_ptr->ai_family,
1097 ai_ptr->ai_socktype,
1098 ai_ptr->ai_protocol);
1104 ERROR ("socket: %s",
1105 sstrerror (errno, errbuf,
1114 if (network_bind_socket (se, ai_ptr) != 0)
1122 else /* listen == 0 */
1124 network_set_ttl (se, ai_ptr);
1127 if (se_tail == NULL)
1138 /* We don't open more than one write-socket per node/service pair.. */
1143 freeaddrinfo (ai_list);
1146 } /* sockent_t *network_create_socket */
1148 static sockent_t *network_create_default_socket (int listen)
1150 sockent_t *se_ptr = NULL;
1151 sockent_t *se_head = NULL;
1152 sockent_t *se_tail = NULL;
1154 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
1155 NET_DEFAULT_PORT, listen);
1157 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
1158 if ((listen == 0) && (se_ptr != NULL))
1165 while (se_tail->next != NULL)
1166 se_tail = se_tail->next;
1169 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
1171 if (se_tail == NULL)
1174 se_tail->next = se_ptr;
1176 } /* sockent_t *network_create_default_socket */
1178 static int network_add_listen_socket (const char *node, const char *service)
1184 if (service == NULL)
1185 service = NET_DEFAULT_PORT;
1188 se = network_create_default_socket (1 /* listen == true */);
1190 se = network_create_socket (node, service, 1 /* listen == true */);
1195 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1198 listen_sockets = (struct pollfd *) realloc (listen_sockets,
1199 (listen_sockets_num + se_num)
1200 * sizeof (struct pollfd));
1202 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1204 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
1205 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
1206 listen_sockets[listen_sockets_num].revents = 0;
1207 listen_sockets_num++;
1212 } /* int network_add_listen_socket */
1214 static int network_add_sending_socket (const char *node, const char *service)
1219 if (service == NULL)
1220 service = NET_DEFAULT_PORT;
1223 se = network_create_default_socket (0 /* listen == false */);
1225 se = network_create_socket (node, service, 0 /* listen == false */);
1230 if (sending_sockets == NULL)
1232 sending_sockets = se;
1236 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
1241 } /* int network_get_listen_socket */
1243 static void *dispatch_thread (void *arg)
1247 receive_list_entry_t *ent;
1249 /* Lock and wait for more data to come in */
1250 pthread_mutex_lock (&receive_list_lock);
1251 while ((listen_loop == 0)
1252 && (receive_list_head == NULL))
1253 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1255 /* Remove the head entry and unlock */
1256 ent = receive_list_head;
1258 receive_list_head = ent->next;
1259 pthread_mutex_unlock (&receive_list_lock);
1261 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1262 * because we dispatch all missing packets before shutting down. */
1266 parse_packet (ent->data, ent->data_len);
1272 } /* void *receive_thread */
1274 static int network_receive (void)
1276 char buffer[BUFF_SIZE];
1282 receive_list_entry_t *private_list_head;
1283 receive_list_entry_t *private_list_tail;
1285 if (listen_sockets_num == 0)
1286 network_add_listen_socket (NULL, NULL);
1288 if (listen_sockets_num == 0)
1290 ERROR ("network: Failed to open a listening socket.");
1294 private_list_head = NULL;
1295 private_list_tail = NULL;
1297 while (listen_loop == 0)
1299 status = poll (listen_sockets, listen_sockets_num, -1);
1306 ERROR ("poll failed: %s",
1307 sstrerror (errno, errbuf, sizeof (errbuf)));
1311 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1313 receive_list_entry_t *ent;
1315 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1319 buffer_len = recv (listen_sockets[i].fd,
1320 buffer, sizeof (buffer),
1325 ERROR ("recv failed: %s",
1326 sstrerror (errno, errbuf,
1331 ent = malloc (sizeof (receive_list_entry_t));
1334 ERROR ("network plugin: malloc failed.");
1337 memset (ent, 0, sizeof (receive_list_entry_t));
1340 /* Hopefully this be optimized out by the compiler. It
1341 * might help prevent stupid bugs in the future though.
1343 assert (sizeof (ent->data) == sizeof (buffer));
1345 memcpy (ent->data, buffer, buffer_len);
1346 ent->data_len = buffer_len;
1348 if (private_list_head == NULL)
1349 private_list_head = ent;
1351 private_list_tail->next = ent;
1352 private_list_tail = ent;
1354 /* Do not block here. Blocking here has led to
1355 * insufficient performance in the past. */
1356 if (pthread_mutex_trylock (&receive_list_lock) == 0)
1358 if (receive_list_head == NULL)
1359 receive_list_head = private_list_head;
1361 receive_list_tail->next = private_list_head;
1362 receive_list_tail = private_list_tail;
1364 private_list_head = NULL;
1365 private_list_tail = NULL;
1367 pthread_cond_signal (&receive_list_cond);
1368 pthread_mutex_unlock (&receive_list_lock);
1370 } /* for (listen_sockets) */
1371 } /* while (listen_loop == 0) */
1373 /* Make sure everything is dispatched before exiting. */
1374 if (private_list_head != NULL)
1376 pthread_mutex_lock (&receive_list_lock);
1378 if (receive_list_head == NULL)
1379 receive_list_head = private_list_head;
1381 receive_list_tail->next = private_list_head;
1382 receive_list_tail = private_list_tail;
1384 private_list_head = NULL;
1385 private_list_tail = NULL;
1387 pthread_cond_signal (&receive_list_cond);
1388 pthread_mutex_unlock (&receive_list_lock);
1394 static void *receive_thread (void *arg)
1396 return (network_receive () ? (void *) 1 : (void *) 0);
1397 } /* void *receive_thread */
1399 static void network_send_buffer (const char *buffer, int buffer_len)
1404 DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1406 for (se = sending_sockets; se != NULL; se = se->next)
1410 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1411 (struct sockaddr *) se->addr, se->addrlen);
1417 ERROR ("network plugin: sendto failed: %s",
1418 sstrerror (errno, errbuf,
1425 } /* for (sending_sockets) */
1426 } /* void network_send_buffer */
1428 static int add_to_buffer (char *buffer, int buffer_size,
1429 value_list_t *vl_def,
1430 const data_set_t *ds, const value_list_t *vl)
1432 char *buffer_orig = buffer;
1434 if (strcmp (vl_def->host, vl->host) != 0)
1436 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1437 vl->host, strlen (vl->host)) != 0)
1439 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
1442 if (vl_def->time != vl->time)
1444 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1445 (uint64_t) vl->time))
1447 vl_def->time = vl->time;
1450 if (vl_def->interval != vl->interval)
1452 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
1453 (uint64_t) vl->interval))
1455 vl_def->interval = vl->interval;
1458 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1460 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1461 vl->plugin, strlen (vl->plugin)) != 0)
1463 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
1466 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1468 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1469 vl->plugin_instance,
1470 strlen (vl->plugin_instance)) != 0)
1472 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
1475 if (strcmp (vl_def->type, vl->type) != 0)
1477 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1478 vl->type, strlen (vl->type)) != 0)
1480 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
1483 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1485 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1487 strlen (vl->type_instance)) != 0)
1489 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
1492 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1495 return (buffer - buffer_orig);
1496 } /* int add_to_buffer */
1498 static void flush_buffer (void)
1500 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1503 network_send_buffer (send_buffer, send_buffer_fill);
1504 send_buffer_ptr = send_buffer;
1505 send_buffer_fill = 0;
1506 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
1509 static int network_write (const data_set_t *ds, const value_list_t *vl)
1513 /* If the value is already in the cache, we have received it via the
1514 * network. We write it again if forwarding is activated. It's then in
1515 * the cache and should we receive it again we will ignore it. */
1516 status = cache_check (vl);
1517 if ((network_config_forward == 0)
1521 pthread_mutex_lock (&send_buffer_lock);
1523 status = add_to_buffer (send_buffer_ptr,
1524 sizeof (send_buffer) - send_buffer_fill,
1529 /* status == bytes added to the buffer */
1530 send_buffer_fill += status;
1531 send_buffer_ptr += status;
1537 status = add_to_buffer (send_buffer_ptr,
1538 sizeof (send_buffer) - send_buffer_fill,
1544 send_buffer_fill += status;
1545 send_buffer_ptr += status;
1551 ERROR ("network plugin: Unable to append to the "
1552 "buffer for some weird reason");
1554 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1559 pthread_mutex_unlock (&send_buffer_lock);
1561 return ((status < 0) ? -1 : 0);
1562 } /* int network_write */
1564 static int network_config (const char *key, const char *val)
1572 if ((strcasecmp ("Listen", key) == 0)
1573 || (strcasecmp ("Server", key) == 0))
1575 char *val_cpy = strdup (val);
1576 if (val_cpy == NULL)
1579 service = NET_DEFAULT_PORT;
1580 fields_num = strsplit (val_cpy, fields, 3);
1581 if ((fields_num != 1)
1582 && (fields_num != 2))
1587 else if (fields_num == 2)
1589 if ((service = strchr (fields[1], '.')) != NULL)
1591 service = fields[1];
1595 if (strcasecmp ("Listen", key) == 0)
1596 network_add_listen_socket (node, service);
1598 network_add_sending_socket (node, service);
1602 else if (strcasecmp ("TimeToLive", key) == 0)
1604 int tmp = atoi (val);
1605 if ((tmp > 0) && (tmp < 256))
1606 network_config_ttl = tmp;
1610 else if (strcasecmp ("Forward", key) == 0)
1612 if ((strcasecmp ("true", val) == 0)
1613 || (strcasecmp ("yes", val) == 0)
1614 || (strcasecmp ("on", val) == 0))
1615 network_config_forward = 1;
1617 network_config_forward = 0;
1619 else if (strcasecmp ("CacheFlush", key) == 0)
1621 int tmp = atoi (val);
1623 cache_flush_interval = tmp;
1631 } /* int network_config */
1633 static int network_notification (const notification_t *n)
1635 char buffer[BUFF_SIZE];
1636 char *buffer_ptr = buffer;
1637 int buffer_free = sizeof (buffer);
1640 memset (buffer, '\0', sizeof (buffer));
1643 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
1644 (uint64_t) n->time);
1648 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
1649 (uint64_t) n->severity);
1653 if (strlen (n->host) > 0)
1655 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
1656 n->host, strlen (n->host));
1661 if (strlen (n->plugin) > 0)
1663 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
1664 n->plugin, strlen (n->plugin));
1669 if (strlen (n->plugin_instance) > 0)
1671 status = write_part_string (&buffer_ptr, &buffer_free,
1672 TYPE_PLUGIN_INSTANCE,
1673 n->plugin_instance, strlen (n->plugin_instance));
1678 if (strlen (n->type) > 0)
1680 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
1681 n->type, strlen (n->type));
1686 if (strlen (n->type_instance) > 0)
1688 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
1689 n->type_instance, strlen (n->type_instance));
1694 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
1695 n->message, strlen (n->message));
1699 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
1702 } /* int network_notification */
1704 static int network_shutdown (void)
1708 /* Kill the listening thread */
1709 if (receive_thread_id != (pthread_t) 0)
1711 pthread_kill (receive_thread_id, SIGTERM);
1712 pthread_join (receive_thread_id, NULL /* no return value */);
1713 receive_thread_id = (pthread_t) 0;
1716 /* Shutdown the dispatching thread */
1717 if (dispatch_thread_id != (pthread_t) 0)
1718 pthread_cond_broadcast (&receive_list_cond);
1720 if (send_buffer_fill > 0)
1723 if (cache_tree != NULL)
1728 while (c_avl_pick (cache_tree, &key, &value) == 0)
1733 c_avl_destroy (cache_tree);
1737 /* TODO: Close `sending_sockets' */
1739 plugin_unregister_config ("network");
1740 plugin_unregister_init ("network");
1741 plugin_unregister_write ("network");
1742 plugin_unregister_shutdown ("network");
1744 /* Let the init function do it's move again ;) */
1745 cache_flush_last = 0;
1748 } /* int network_shutdown */
1750 static int network_init (void)
1752 /* Check if we were already initialized. If so, just return - there's
1753 * nothing more to do (for now, that is). */
1754 if (cache_flush_last != 0)
1757 plugin_register_shutdown ("network", network_shutdown);
1759 send_buffer_ptr = send_buffer;
1760 send_buffer_fill = 0;
1761 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
1763 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1764 cache_flush_last = time (NULL);
1766 /* setup socket(s) and so on */
1767 if (sending_sockets != NULL)
1769 plugin_register_write ("network", network_write);
1770 plugin_register_notification ("network", network_notification);
1773 if ((listen_sockets_num != 0) && (receive_thread_id == 0))
1777 status = pthread_create (&dispatch_thread_id,
1778 NULL /* no attributes */,
1780 NULL /* no argument */);
1784 ERROR ("network: pthread_create failed: %s",
1785 sstrerror (errno, errbuf,
1789 status = pthread_create (&receive_thread_id,
1790 NULL /* no attributes */,
1792 NULL /* no argument */);
1796 ERROR ("network: pthread_create failed: %s",
1797 sstrerror (errno, errbuf,
1802 } /* int network_init */
1805 * The flush option of the network plugin cannot flush individual identifiers.
1806 * All the values are added to a buffer and sent when the buffer is full, the
1807 * requested value may or may not be in there, it's not worth finding out. We
1808 * just send the buffer if `flush' is called - if the requested value was in
1809 * there, good. If not, well, then there is nothing to flush.. -octo
1811 static int network_flush (int timeout, const char *identifier)
1813 pthread_mutex_lock (&send_buffer_lock);
1815 if (((time (NULL) - cache_flush_last) >= timeout)
1816 && (send_buffer_fill > 0))
1821 pthread_mutex_unlock (&send_buffer_lock);
1824 } /* int network_flush */
1826 void module_register (void)
1828 plugin_register_config ("network", network_config,
1829 config_keys, config_keys_num);
1830 plugin_register_init ("network", network_init);
1831 plugin_register_flush ("network", network_flush);
1832 } /* void module_register */