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 char send_buffer_type[DATA_MAX_NAME_LEN];
182 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
184 static c_avl_tree_t *cache_tree = NULL;
185 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
186 static time_t cache_flush_last;
187 static int cache_flush_interval = 1800;
192 static int cache_flush (void)
202 c_avl_iterator_t *iter;
204 time_t curtime = time (NULL);
206 iter = c_avl_get_iterator (cache_tree);
207 while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
209 if ((curtime - *value) <= cache_flush_interval)
211 tmp = (char **) realloc (keys,
212 (keys_num + 1) * sizeof (char *));
216 c_avl_iterator_destroy (iter);
217 ERROR ("network plugin: cache_flush: realloc"
222 keys[keys_num] = key;
224 } /* while (c_avl_iterator_next) */
225 c_avl_iterator_destroy (iter);
227 for (i = 0; i < keys_num; i++)
229 if (c_avl_remove (cache_tree, keys[i], (void *) &key,
230 (void *) &value) != 0)
232 WARNING ("network plugin: cache_flush: c_avl_remove"
233 " (%s) failed.", keys[i]);
243 DEBUG ("network plugin: cache_flush: Removed %i %s",
244 keys_num, (keys_num == 1) ? "entry" : "entries");
245 cache_flush_last = curtime;
247 } /* int cache_flush */
249 static int cache_check (const char *type, const value_list_t *vl)
252 time_t *value = NULL;
255 if (cache_tree == NULL)
258 if (format_name (key, sizeof (key), vl->host, vl->plugin,
259 vl->plugin_instance, type, vl->type_instance))
262 pthread_mutex_lock (&cache_lock);
264 if (c_avl_get (cache_tree, key, (void *) &value) == 0)
266 if (*value < vl->time)
273 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
274 (int) *value, (int) vl->time);
280 char *key_copy = strdup (key);
281 value = malloc (sizeof (time_t));
282 if ((key_copy != NULL) && (value != NULL))
285 c_avl_insert (cache_tree, key_copy, value);
295 if ((time (NULL) - cache_flush_last) > cache_flush_interval)
298 pthread_mutex_unlock (&cache_lock);
300 DEBUG ("network plugin: cache_check: key = %s; time = %i; retval = %i",
301 key, (int) vl->time, retval);
304 } /* int cache_check */
306 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
307 const data_set_t *ds, const value_list_t *vl)
313 part_header_t pkg_ph;
314 uint16_t pkg_num_values;
315 uint8_t *pkg_values_types;
321 num_values = vl->values_len;
322 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
323 + (num_values * sizeof (uint8_t))
324 + (num_values * sizeof (value_t));
326 if (*ret_buffer_len < packet_len)
329 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
330 if (pkg_values_types == NULL)
332 ERROR ("network plugin: write_part_values: malloc failed.");
336 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
337 if (pkg_values == NULL)
339 free (pkg_values_types);
340 ERROR ("network plugin: write_part_values: malloc failed.");
344 pkg_ph.type = htons (TYPE_VALUES);
345 pkg_ph.length = htons (packet_len);
347 pkg_num_values = htons ((uint16_t) vl->values_len);
349 for (i = 0; i < num_values; i++)
351 if (ds->ds[i].type == DS_TYPE_COUNTER)
353 pkg_values_types[i] = DS_TYPE_COUNTER;
354 pkg_values[i].counter = htonll (vl->values[i].counter);
358 pkg_values_types[i] = DS_TYPE_GAUGE;
359 pkg_values[i].gauge = htond (vl->values[i].gauge);
364 * Use `memcpy' to write everything to the buffer, because the pointer
365 * may be unaligned and some architectures, such as SPARC, can't handle
368 packet_ptr = *ret_buffer;
370 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
371 offset += sizeof (pkg_ph);
372 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
373 offset += sizeof (pkg_num_values);
374 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
375 offset += num_values * sizeof (uint8_t);
376 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
377 offset += num_values * sizeof (value_t);
379 assert (offset == packet_len);
381 *ret_buffer = packet_ptr + packet_len;
382 *ret_buffer_len -= packet_len;
384 free (pkg_values_types);
388 } /* int write_part_values */
390 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
391 int type, uint64_t value)
396 part_header_t pkg_head;
401 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
403 if (*ret_buffer_len < packet_len)
406 pkg_head.type = htons (type);
407 pkg_head.length = htons (packet_len);
408 pkg_value = htonll (value);
410 packet_ptr = *ret_buffer;
412 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
413 offset += sizeof (pkg_head);
414 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
415 offset += sizeof (pkg_value);
417 assert (offset == packet_len);
419 *ret_buffer = packet_ptr + packet_len;
420 *ret_buffer_len -= packet_len;
423 } /* int write_part_number */
425 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
426 int type, const char *str, int str_len)
431 part_header_t pkg_head;
435 packet_len = sizeof (pkg_head) + str_len + 1;
436 if (*ret_buffer_len < packet_len)
439 pkg_head.type = htons (type);
440 pkg_head.length = htons (packet_len);
442 packet_ptr = *ret_buffer;
444 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
445 offset += sizeof (pkg_head);
446 memcpy (packet_ptr + offset, str, str_len);
448 memset (packet_ptr + offset, '\0', 1);
451 assert (offset == packet_len);
453 *ret_buffer = packet_ptr + packet_len;
454 *ret_buffer_len -= packet_len;
457 } /* int write_part_string */
459 static int parse_part_values (void **ret_buffer, int *ret_buffer_len,
460 value_t **ret_values, int *ret_num_values)
462 char *buffer = *ret_buffer;
463 int buffer_len = *ret_buffer_len;
471 if (buffer_len < (15))
473 DEBUG ("network plugin: packet is too short: buffer_len = %i",
478 pv.head = (part_header_t *) buffer;
479 h_length = ntohs (pv.head->length);
480 h_type = ntohs (pv.head->type);
482 assert (h_type == TYPE_VALUES);
484 pv.num_values = (uint16_t *) (pv.head + 1);
485 h_num = ntohs (*pv.num_values);
487 if (h_num != ((h_length - 6) / 9))
489 DEBUG ("`length' and `num of values' don't match");
493 pv.values_types = (uint8_t *) (pv.num_values + 1);
494 pv.values = (value_t *) (pv.values_types + h_num);
496 for (i = 0; i < h_num; i++)
497 if (pv.values_types[i] == DS_TYPE_COUNTER)
498 pv.values[i].counter = ntohll (pv.values[i].counter);
500 pv.values[i].gauge = ntohd (pv.values[i].gauge);
502 *ret_buffer = (void *) (pv.values + h_num);
503 *ret_buffer_len = buffer_len - h_length;
504 *ret_num_values = h_num;
505 *ret_values = pv.values;
508 } /* int parse_part_values */
510 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
516 pn.head = (part_header_t *) *ret_buffer;
517 pn.value = (uint64_t *) (pn.head + 1);
519 len = ntohs (pn.head->length);
522 if (len > *ret_buffer_len)
524 *value = ntohll (*pn.value);
526 *ret_buffer = (void *) (pn.value + 1);
527 *ret_buffer_len -= len;
530 } /* int parse_part_number */
532 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
533 char *output, int output_len)
535 char *buffer = *ret_buffer;
536 int buffer_len = *ret_buffer_len;
542 DEBUG ("network plugin: parse_part_string: ret_buffer = %p;"
543 " ret_buffer_len = %i; output = %p; output_len = %i;",
544 *ret_buffer, *ret_buffer_len,
545 (void *) output, output_len);
547 ps.head = (part_header_t *) buffer;
549 h_length = ntohs (ps.head->length);
550 h_type = ntohs (ps.head->type);
552 DEBUG ("network plugin: parse_part_string: length = %hu; type = %hu;",
555 if (buffer_len < h_length)
557 DEBUG ("packet is too short");
560 assert ((h_type == TYPE_HOST)
561 || (h_type == TYPE_PLUGIN)
562 || (h_type == TYPE_PLUGIN_INSTANCE)
563 || (h_type == TYPE_TYPE)
564 || (h_type == TYPE_TYPE_INSTANCE)
565 || (h_type == TYPE_MESSAGE));
567 ps.value = buffer + 4;
568 if (ps.value[h_length - 5] != '\0')
570 DEBUG ("String does not end with a nullbyte");
574 if (output_len < (h_length - 4))
576 DEBUG ("output buffer is too small");
579 strcpy (output, ps.value);
581 DEBUG ("network plugin: parse_part_string: output = %s", output);
583 *ret_buffer = (void *) (buffer + h_length);
584 *ret_buffer_len = buffer_len - h_length;
587 } /* int parse_part_string */
589 static int parse_packet (void *buffer, int buffer_len)
591 part_header_t *header;
594 value_list_t vl = VALUE_LIST_INIT;
595 char type[DATA_MAX_NAME_LEN];
598 DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
601 memset (&vl, '\0', sizeof (vl));
602 memset (&type, '\0', sizeof (type));
603 memset (&n, '\0', sizeof (n));
606 while ((status == 0) && (0 < buffer_len)
607 && ((unsigned int) buffer_len > sizeof (part_header_t)))
609 header = (part_header_t *) buffer;
611 if (ntohs (header->length) > buffer_len)
613 /* Assure that this loop terminates eventually */
614 if (ntohs (header->length) < 4)
617 if (ntohs (header->type) == TYPE_VALUES)
619 status = parse_part_values (&buffer, &buffer_len,
620 &vl.values, &vl.values_len);
624 DEBUG ("parse_part_values failed.");
629 && (strlen (vl.host) > 0)
630 && (strlen (vl.plugin) > 0)
631 && (strlen (type) > 0)
632 && (cache_check (type, &vl) == 0))
634 DEBUG ("network plugin: parse_packet:"
635 " dispatching values");
636 plugin_dispatch_values (type, &vl);
640 DEBUG ("network plugin: parse_packet:"
641 " NOT dispatching values");
644 else if (ntohs (header->type) == TYPE_TIME)
647 status = parse_part_number (&buffer, &buffer_len, &tmp);
650 vl.time = (time_t) tmp;
651 n.time = (time_t) tmp;
654 else if (ntohs (header->type) == TYPE_INTERVAL)
657 status = parse_part_number (&buffer, &buffer_len, &tmp);
659 vl.interval = (int) tmp;
661 else if (ntohs (header->type) == TYPE_HOST)
663 status = parse_part_string (&buffer, &buffer_len,
664 vl.host, sizeof (vl.host));
665 strncpy (n.host, vl.host, sizeof (n.host));
666 n.host[sizeof (n.host) - 1] = '\0';
667 DEBUG ("network plugin: parse_packet: vl.host = %s",
670 else if (ntohs (header->type) == TYPE_PLUGIN)
672 status = parse_part_string (&buffer, &buffer_len,
673 vl.plugin, sizeof (vl.plugin));
674 strncpy (n.plugin, vl.plugin, sizeof (n.plugin));
675 n.plugin[sizeof (n.plugin) - 1] = '\0';
676 DEBUG ("network plugin: parse_packet: vl.plugin = %s",
679 else if (ntohs (header->type) == TYPE_PLUGIN_INSTANCE)
681 status = parse_part_string (&buffer, &buffer_len,
683 sizeof (vl.plugin_instance));
684 strncpy (n.plugin_instance, vl.plugin_instance,
685 sizeof (n.plugin_instance));
686 n.plugin_instance[sizeof (n.plugin_instance) - 1] = '\0';
687 DEBUG ("network plugin: parse_packet: "
688 "vl.plugin_instance = %s",
691 else if (ntohs (header->type) == TYPE_TYPE)
693 status = parse_part_string (&buffer, &buffer_len,
694 type, sizeof (type));
695 strncpy (n.type, type, sizeof (n.type));
696 n.type[sizeof (n.type) - 1] = '\0';
697 DEBUG ("network plugin: parse_packet: type = %s",
700 else if (ntohs (header->type) == TYPE_TYPE_INSTANCE)
702 status = parse_part_string (&buffer, &buffer_len,
704 sizeof (vl.type_instance));
705 strncpy (n.type_instance, vl.type_instance,
706 sizeof (n.type_instance));
707 n.type_instance[sizeof (n.type_instance) - 1] = '\0';
708 DEBUG ("network plugin: parse_packet: "
709 "vl.type_instance = %s",
712 else if (ntohs (header->type) == TYPE_MESSAGE)
714 status = parse_part_string (&buffer, &buffer_len,
715 n.message, sizeof (n.message));
716 DEBUG ("network plugin: parse_packet: n.message = %s",
719 if ((n.severity != NOTIF_FAILURE)
720 && (n.severity != NOTIF_WARNING)
721 && (n.severity != NOTIF_OKAY))
723 INFO ("network plugin: "
724 "Ignoring notification with "
725 "unknown severity %s.",
728 else if (n.time <= 0)
730 INFO ("network plugin: "
731 "Ignoring notification with "
734 else if (strlen (n.message) <= 0)
736 INFO ("network plugin: "
737 "Ignoring notification with "
738 "an empty message.");
743 * TODO: Let this do a separate thread so that
744 * no packets are lost if this takes too long.
746 plugin_dispatch_notification (&n);
749 else if (ntohs (header->type) == TYPE_SEVERITY)
752 status = parse_part_number (&buffer, &buffer_len, &tmp);
754 n.severity = (int) tmp;
758 DEBUG ("network plugin: parse_packet: Unknown part"
759 " type: 0x%0hx", ntohs (header->type));
760 buffer = ((char *) buffer) + ntohs (header->length);
762 } /* while (buffer_len > sizeof (part_header_t)) */
765 } /* int parse_packet */
767 static void free_sockent (sockent_t *se)
777 } /* void free_sockent */
780 * int network_set_ttl
782 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
783 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
785 * The `struct addrinfo' is used to destinguish between unicast and multicast
788 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
790 if ((network_config_ttl < 1) || (network_config_ttl > 255))
793 DEBUG ("ttl = %i", network_config_ttl);
795 if (ai->ai_family == AF_INET)
797 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
800 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
801 optname = IP_MULTICAST_TTL;
805 if (setsockopt (se->fd, IPPROTO_IP, optname,
807 sizeof (network_config_ttl)) == -1)
810 ERROR ("setsockopt: %s",
811 sstrerror (errno, errbuf, sizeof (errbuf)));
815 else if (ai->ai_family == AF_INET6)
817 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
818 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
821 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
822 optname = IPV6_MULTICAST_HOPS;
824 optname = IPV6_UNICAST_HOPS;
826 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
828 sizeof (network_config_ttl)) == -1)
831 ERROR ("setsockopt: %s",
832 sstrerror (errno, errbuf,
839 } /* int network_set_ttl */
841 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
846 /* allow multiple sockets to use the same PORT number */
847 if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR,
848 &yes, sizeof(yes)) == -1) {
850 ERROR ("setsockopt: %s",
851 sstrerror (errno, errbuf, sizeof (errbuf)));
855 DEBUG ("fd = %i; calling `bind'", se->fd);
857 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
861 sstrerror (errno, errbuf, sizeof (errbuf)));
865 if (ai->ai_family == AF_INET)
867 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
868 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
872 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
874 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
875 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
877 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
878 &loop, sizeof (loop)) == -1)
881 ERROR ("setsockopt: %s",
882 sstrerror (errno, errbuf,
887 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
888 &mreq, sizeof (mreq)) == -1)
891 ERROR ("setsockopt: %s",
892 sstrerror (errno, errbuf,
898 else if (ai->ai_family == AF_INET6)
900 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
901 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
902 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
904 struct ipv6_mreq mreq;
906 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
908 memcpy (&mreq.ipv6mr_multiaddr,
910 sizeof (addr->sin6_addr));
912 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
913 * ipv6mr_interface may be set to zeroes to
914 * choose the default multicast interface or to
915 * the index of a particular multicast-capable
916 * interface if the host is multihomed.
917 * Membership is associ-associated with a
918 * single interface; programs running on
919 * multihomed hosts may need to join the same
920 * group on more than one interface.*/
921 mreq.ipv6mr_interface = 0;
923 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
924 &loop, sizeof (loop)) == -1)
927 ERROR ("setsockopt: %s",
928 sstrerror (errno, errbuf,
933 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
934 &mreq, sizeof (mreq)) == -1)
937 ERROR ("setsockopt: %s",
938 sstrerror (errno, errbuf,
946 } /* int network_bind_socket */
948 static sockent_t *network_create_socket (const char *node,
952 struct addrinfo ai_hints;
953 struct addrinfo *ai_list, *ai_ptr;
956 sockent_t *se_head = NULL;
957 sockent_t *se_tail = NULL;
959 DEBUG ("node = %s, service = %s", node, service);
961 memset (&ai_hints, '\0', sizeof (ai_hints));
962 ai_hints.ai_flags = 0;
964 ai_hints.ai_flags |= AI_PASSIVE;
967 ai_hints.ai_flags |= AI_ADDRCONFIG;
969 ai_hints.ai_family = AF_UNSPEC;
970 ai_hints.ai_socktype = SOCK_DGRAM;
971 ai_hints.ai_protocol = IPPROTO_UDP;
973 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
977 ERROR ("getaddrinfo (%s, %s): %s",
978 (node == NULL) ? "(null)" : node,
979 (service == NULL) ? "(null)" : service,
980 (ai_return == EAI_SYSTEM)
981 ? sstrerror (errno, errbuf, sizeof (errbuf))
982 : gai_strerror (ai_return));
986 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
990 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
994 sstrerror (errno, errbuf,
999 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
1002 ERROR ("malloc: %s",
1003 sstrerror (errno, errbuf,
1009 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1010 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
1011 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1012 se->addrlen = ai_ptr->ai_addrlen;
1014 se->fd = socket (ai_ptr->ai_family,
1015 ai_ptr->ai_socktype,
1016 ai_ptr->ai_protocol);
1022 ERROR ("socket: %s",
1023 sstrerror (errno, errbuf,
1032 if (network_bind_socket (se, ai_ptr) != 0)
1040 else /* listen == 0 */
1042 network_set_ttl (se, ai_ptr);
1045 if (se_tail == NULL)
1056 /* We don't open more than one write-socket per node/service pair.. */
1061 freeaddrinfo (ai_list);
1064 } /* sockent_t *network_create_socket */
1066 static sockent_t *network_create_default_socket (int listen)
1068 sockent_t *se_ptr = NULL;
1069 sockent_t *se_head = NULL;
1070 sockent_t *se_tail = NULL;
1072 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
1073 NET_DEFAULT_PORT, listen);
1075 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
1076 if ((listen == 0) && (se_ptr != NULL))
1083 while (se_tail->next != NULL)
1084 se_tail = se_tail->next;
1087 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
1089 if (se_tail == NULL)
1092 se_tail->next = se_ptr;
1094 } /* sockent_t *network_create_default_socket */
1096 static int network_add_listen_socket (const char *node, const char *service)
1102 if (service == NULL)
1103 service = NET_DEFAULT_PORT;
1106 se = network_create_default_socket (1 /* listen == true */);
1108 se = network_create_socket (node, service, 1 /* listen == true */);
1113 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1116 listen_sockets = (struct pollfd *) realloc (listen_sockets,
1117 (listen_sockets_num + se_num)
1118 * sizeof (struct pollfd));
1120 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1122 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
1123 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
1124 listen_sockets[listen_sockets_num].revents = 0;
1125 listen_sockets_num++;
1130 } /* int network_add_listen_socket */
1132 static int network_add_sending_socket (const char *node, const char *service)
1137 if (service == NULL)
1138 service = NET_DEFAULT_PORT;
1141 se = network_create_default_socket (0 /* listen == false */);
1143 se = network_create_socket (node, service, 0 /* listen == false */);
1148 if (sending_sockets == NULL)
1150 sending_sockets = se;
1154 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
1159 } /* int network_get_listen_socket */
1161 static void *dispatch_thread (void *arg)
1165 receive_list_entry_t *ent;
1167 /* Lock and wait for more data to come in */
1168 pthread_mutex_lock (&receive_list_lock);
1169 while ((listen_loop == 0)
1170 && (receive_list_head == NULL))
1171 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1173 /* Remove the head entry and unlock */
1174 ent = receive_list_head;
1176 receive_list_head = ent->next;
1177 pthread_mutex_unlock (&receive_list_lock);
1179 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1180 * because we dispatch all missing packets before shutting down. */
1184 parse_packet (ent->data, ent->data_len);
1190 } /* void *receive_thread */
1192 static int network_receive (void)
1194 char buffer[BUFF_SIZE];
1200 if (listen_sockets_num == 0)
1201 network_add_listen_socket (NULL, NULL);
1203 if (listen_sockets_num == 0)
1205 ERROR ("network: Failed to open a listening socket.");
1209 while (listen_loop == 0)
1211 status = poll (listen_sockets, listen_sockets_num, -1);
1218 ERROR ("poll failed: %s",
1219 sstrerror (errno, errbuf, sizeof (errbuf)));
1223 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1225 receive_list_entry_t *ent;
1227 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1231 buffer_len = recv (listen_sockets[i].fd,
1232 buffer, sizeof (buffer),
1237 ERROR ("recv failed: %s",
1238 sstrerror (errno, errbuf,
1243 ent = malloc (sizeof (receive_list_entry_t));
1246 ERROR ("network plugin: malloc failed.");
1249 memset (ent, '\0', sizeof (receive_list_entry_t));
1251 /* Hopefully this be optimized out by the compiler. It
1252 * might help prevent stupid bugs in the future though.
1254 assert (sizeof (ent->data) == sizeof (buffer));
1256 memcpy (ent->data, buffer, buffer_len);
1257 ent->data_len = buffer_len;
1259 pthread_mutex_lock (&receive_list_lock);
1260 if (receive_list_head == NULL)
1262 receive_list_head = ent;
1263 receive_list_tail = ent;
1267 receive_list_tail->next = ent;
1268 receive_list_tail = ent;
1270 pthread_cond_signal (&receive_list_cond);
1271 pthread_mutex_unlock (&receive_list_lock);
1272 } /* for (listen_sockets) */
1273 } /* while (listen_loop == 0) */
1278 static void *receive_thread (void *arg)
1280 return (network_receive () ? (void *) 1 : (void *) 0);
1281 } /* void *receive_thread */
1283 static void network_send_buffer (const char *buffer, int buffer_len)
1288 DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1290 for (se = sending_sockets; se != NULL; se = se->next)
1294 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1295 (struct sockaddr *) se->addr, se->addrlen);
1301 ERROR ("network plugin: sendto failed: %s",
1302 sstrerror (errno, errbuf,
1309 } /* for (sending_sockets) */
1310 } /* void network_send_buffer */
1312 static int add_to_buffer (char *buffer, int buffer_size,
1313 value_list_t *vl_def, char *type_def,
1314 const data_set_t *ds, const value_list_t *vl)
1316 char *buffer_orig = buffer;
1318 if (strcmp (vl_def->host, vl->host) != 0)
1320 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1321 vl->host, strlen (vl->host)) != 0)
1323 strcpy (vl_def->host, vl->host);
1326 if (vl_def->time != vl->time)
1328 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1329 (uint64_t) vl->time))
1331 vl_def->time = vl->time;
1334 if (vl_def->interval != vl->interval)
1336 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
1337 (uint64_t) vl->interval))
1339 vl_def->interval = vl->interval;
1342 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1344 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1345 vl->plugin, strlen (vl->plugin)) != 0)
1347 strcpy (vl_def->plugin, vl->plugin);
1350 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1352 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1353 vl->plugin_instance,
1354 strlen (vl->plugin_instance)) != 0)
1356 strcpy (vl_def->plugin_instance, vl->plugin_instance);
1359 if (strcmp (type_def, ds->type) != 0)
1361 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1362 ds->type, strlen (ds->type)) != 0)
1364 strcpy (type_def, ds->type);
1367 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1369 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1371 strlen (vl->type_instance)) != 0)
1373 strcpy (vl_def->type_instance, vl->type_instance);
1376 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1379 return (buffer - buffer_orig);
1380 } /* int add_to_buffer */
1382 static void flush_buffer (void)
1384 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1387 network_send_buffer (send_buffer, send_buffer_fill);
1388 send_buffer_ptr = send_buffer;
1389 send_buffer_fill = 0;
1390 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1391 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1394 static int network_write (const data_set_t *ds, const value_list_t *vl)
1398 /* If the value is already in the cache, we have received it via the
1399 * network. We write it again if forwarding is activated. It's then in
1400 * the cache and should we receive it again we will ignore it. */
1401 status = cache_check (ds->type, vl);
1402 if ((network_config_forward == 0)
1406 pthread_mutex_lock (&send_buffer_lock);
1408 status = add_to_buffer (send_buffer_ptr,
1409 sizeof (send_buffer) - send_buffer_fill,
1410 &send_buffer_vl, send_buffer_type,
1414 /* status == bytes added to the buffer */
1415 send_buffer_fill += status;
1416 send_buffer_ptr += status;
1422 status = add_to_buffer (send_buffer_ptr,
1423 sizeof (send_buffer) - send_buffer_fill,
1424 &send_buffer_vl, send_buffer_type,
1429 send_buffer_fill += status;
1430 send_buffer_ptr += status;
1436 ERROR ("network plugin: Unable to append to the "
1437 "buffer for some weird reason");
1439 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1444 pthread_mutex_unlock (&send_buffer_lock);
1446 return ((status < 0) ? -1 : 0);
1447 } /* int network_write */
1449 static int network_config (const char *key, const char *val)
1457 if ((strcasecmp ("Listen", key) == 0)
1458 || (strcasecmp ("Server", key) == 0))
1460 char *val_cpy = strdup (val);
1461 if (val_cpy == NULL)
1464 service = NET_DEFAULT_PORT;
1465 fields_num = strsplit (val_cpy, fields, 3);
1466 if ((fields_num != 1)
1467 && (fields_num != 2))
1469 else if (fields_num == 2)
1471 if ((service = strchr (fields[1], '.')) != NULL)
1473 service = fields[1];
1477 if (strcasecmp ("Listen", key) == 0)
1478 network_add_listen_socket (node, service);
1480 network_add_sending_socket (node, service);
1482 else if (strcasecmp ("TimeToLive", key) == 0)
1484 int tmp = atoi (val);
1485 if ((tmp > 0) && (tmp < 256))
1486 network_config_ttl = tmp;
1490 else if (strcasecmp ("Forward", key) == 0)
1492 if ((strcasecmp ("true", val) == 0)
1493 || (strcasecmp ("yes", val) == 0)
1494 || (strcasecmp ("on", val) == 0))
1495 network_config_forward = 1;
1497 network_config_forward = 0;
1499 else if (strcasecmp ("CacheFlush", key) == 0)
1501 int tmp = atoi (val);
1503 cache_flush_interval = tmp;
1511 } /* int network_config */
1513 static int network_notification (const notification_t *n)
1515 char buffer[BUFF_SIZE];
1516 char *buffer_ptr = buffer;
1517 int buffer_free = sizeof (buffer);
1520 memset (buffer, '\0', sizeof (buffer));
1523 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
1524 (uint64_t) n->time);
1528 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
1529 (uint64_t) n->severity);
1533 if (strlen (n->host) > 0)
1535 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
1536 n->host, strlen (n->host));
1541 if (strlen (n->plugin) > 0)
1543 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
1544 n->plugin, strlen (n->plugin));
1549 if (strlen (n->plugin_instance) > 0)
1551 status = write_part_string (&buffer_ptr, &buffer_free,
1552 TYPE_PLUGIN_INSTANCE,
1553 n->plugin_instance, strlen (n->plugin_instance));
1558 if (strlen (n->type) > 0)
1560 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
1561 n->type, strlen (n->type));
1566 if (strlen (n->type_instance) > 0)
1568 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
1569 n->type_instance, strlen (n->type_instance));
1574 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
1575 n->message, strlen (n->message));
1579 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
1582 } /* int network_notification */
1584 static int network_shutdown (void)
1588 /* Kill the listening thread */
1589 if (receive_thread_id != (pthread_t) 0)
1591 pthread_kill (receive_thread_id, SIGTERM);
1592 pthread_join (receive_thread_id, NULL /* no return value */);
1593 receive_thread_id = (pthread_t) 0;
1596 /* Shutdown the dispatching thread */
1597 if (dispatch_thread_id != (pthread_t) 0)
1598 pthread_cond_broadcast (&receive_list_cond);
1600 if (send_buffer_fill > 0)
1603 if (cache_tree != NULL)
1608 while (c_avl_pick (cache_tree, &key, &value) == 0)
1613 c_avl_destroy (cache_tree);
1617 /* TODO: Close `sending_sockets' */
1619 plugin_unregister_config ("network");
1620 plugin_unregister_init ("network");
1621 plugin_unregister_write ("network");
1622 plugin_unregister_shutdown ("network");
1625 } /* int network_shutdown */
1627 static int network_init (void)
1629 plugin_register_shutdown ("network", network_shutdown);
1631 send_buffer_ptr = send_buffer;
1632 send_buffer_fill = 0;
1633 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1634 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1636 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1637 cache_flush_last = time (NULL);
1639 /* setup socket(s) and so on */
1640 if (sending_sockets != NULL)
1642 plugin_register_write ("network", network_write);
1643 plugin_register_notification ("network", network_notification);
1646 if ((listen_sockets_num != 0) && (receive_thread_id == 0))
1650 status = pthread_create (&dispatch_thread_id,
1651 NULL /* no attributes */,
1653 NULL /* no argument */);
1657 ERROR ("network: pthread_create failed: %s",
1658 sstrerror (errno, errbuf,
1662 status = pthread_create (&receive_thread_id,
1663 NULL /* no attributes */,
1665 NULL /* no argument */);
1669 ERROR ("network: pthread_create failed: %s",
1670 sstrerror (errno, errbuf,
1675 } /* int network_init */
1677 static int network_flush (int timeout)
1679 pthread_mutex_lock (&send_buffer_lock);
1681 if (((time (NULL) - cache_flush_last) >= timeout)
1682 && (send_buffer_fill > 0))
1687 pthread_mutex_unlock (&send_buffer_lock);
1690 } /* int network_flush */
1692 void module_register (void)
1694 plugin_register_config ("network", network_config,
1695 config_keys, config_keys_num);
1696 plugin_register_init ("network", network_init);
1697 plugin_register_flush ("network", network_flush);
1698 } /* void module_register */