2 * collectd - src/network.c
3 * Copyright (C) 2005-2007 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 = 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 *ret_buffer = (void *) (pv.values + h_num);
501 *ret_buffer_len = buffer_len - h_length;
502 *ret_num_values = h_num;
503 *ret_values = pv.values;
506 } /* int parse_part_values */
508 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
514 pn.head = (part_header_t *) *ret_buffer;
515 pn.value = (uint64_t *) (pn.head + 1);
517 len = ntohs (pn.head->length);
520 if (len > *ret_buffer_len)
522 *value = ntohll (*pn.value);
524 *ret_buffer = (void *) (pn.value + 1);
525 *ret_buffer_len -= len;
528 } /* int parse_part_number */
530 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
531 char *output, int output_len)
533 char *buffer = *ret_buffer;
534 int buffer_len = *ret_buffer_len;
540 DEBUG ("network plugin: parse_part_string: ret_buffer = %p;"
541 " ret_buffer_len = %i; output = %p; output_len = %i;",
542 *ret_buffer, *ret_buffer_len,
543 (void *) output, output_len);
545 ps.head = (part_header_t *) buffer;
547 h_length = ntohs (ps.head->length);
548 h_type = ntohs (ps.head->type);
550 DEBUG ("network plugin: parse_part_string: length = %hu; type = %hu;",
553 if (buffer_len < h_length)
555 DEBUG ("packet is too short");
558 assert ((h_type == TYPE_HOST)
559 || (h_type == TYPE_PLUGIN)
560 || (h_type == TYPE_PLUGIN_INSTANCE)
561 || (h_type == TYPE_TYPE)
562 || (h_type == TYPE_TYPE_INSTANCE));
564 ps.value = buffer + 4;
565 if (ps.value[h_length - 5] != '\0')
567 DEBUG ("String does not end with a nullbyte");
571 if (output_len < (h_length - 4))
573 DEBUG ("output buffer is too small");
576 strcpy (output, ps.value);
578 DEBUG ("network plugin: parse_part_string: output = %s", output);
580 *ret_buffer = (void *) (buffer + h_length);
581 *ret_buffer_len = buffer_len - h_length;
584 } /* int parse_part_string */
586 static int parse_packet (void *buffer, int buffer_len)
588 part_header_t *header;
591 value_list_t vl = VALUE_LIST_INIT;
592 char type[DATA_MAX_NAME_LEN];
594 DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
597 memset (&vl, '\0', sizeof (vl));
598 memset (&type, '\0', sizeof (type));
601 while ((status == 0) && (buffer_len > sizeof (part_header_t)))
603 header = (part_header_t *) buffer;
605 if (ntohs (header->length) > buffer_len)
607 /* Assure that this loop terminates eventually */
608 if (ntohs (header->length) < 4)
611 if (ntohs (header->type) == TYPE_VALUES)
613 status = parse_part_values (&buffer, &buffer_len,
614 &vl.values, &vl.values_len);
618 DEBUG ("parse_part_values failed.");
623 && (strlen (vl.host) > 0)
624 && (strlen (vl.plugin) > 0)
625 && (strlen (type) > 0)
626 && (cache_check (type, &vl) == 0))
628 DEBUG ("network plugin: parse_packet:"
629 " dispatching values");
630 plugin_dispatch_values (type, &vl);
634 DEBUG ("network plugin: parse_packet:"
635 " NOT dispatching values");
638 else if (ntohs (header->type) == TYPE_TIME)
641 status = parse_part_number (&buffer, &buffer_len, &tmp);
643 vl.time = (time_t) tmp;
645 else if (ntohs (header->type) == TYPE_INTERVAL)
648 status = parse_part_number (&buffer, &buffer_len, &tmp);
650 vl.interval = (int) tmp;
652 else if (ntohs (header->type) == TYPE_HOST)
654 status = parse_part_string (&buffer, &buffer_len,
655 vl.host, sizeof (vl.host));
656 DEBUG ("network plugin: parse_packet: vl.host = %s", vl.host);
658 else if (ntohs (header->type) == TYPE_PLUGIN)
660 status = parse_part_string (&buffer, &buffer_len,
661 vl.plugin, sizeof (vl.plugin));
662 DEBUG ("network plugin: parse_packet: vl.plugin = %s", vl.plugin);
664 else if (ntohs (header->type) == TYPE_PLUGIN_INSTANCE)
666 status = parse_part_string (&buffer, &buffer_len,
667 vl.plugin_instance, sizeof (vl.plugin_instance));
668 DEBUG ("network plugin: parse_packet: vl.plugin_instance = %s", vl.plugin_instance);
670 else if (ntohs (header->type) == TYPE_TYPE)
672 status = parse_part_string (&buffer, &buffer_len,
673 type, sizeof (type));
674 DEBUG ("network plugin: parse_packet: type = %s", type);
676 else if (ntohs (header->type) == TYPE_TYPE_INSTANCE)
678 status = parse_part_string (&buffer, &buffer_len,
679 vl.type_instance, sizeof (vl.type_instance));
680 DEBUG ("network plugin: parse_packet: vl.type_instance = %s", vl.type_instance);
684 DEBUG ("network plugin: parse_packet: Unknown part"
685 " type: 0x%0hx", ntohs (header->type));
686 buffer = ((char *) buffer) + ntohs (header->length);
688 } /* while (buffer_len > sizeof (part_header_t)) */
691 } /* int parse_packet */
693 static void free_sockent (sockent_t *se)
703 } /* void free_sockent */
706 * int network_set_ttl
708 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
709 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
711 * The `struct addrinfo' is used to destinguish between unicast and multicast
714 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
716 if ((network_config_ttl < 1) || (network_config_ttl > 255))
719 DEBUG ("ttl = %i", network_config_ttl);
721 if (ai->ai_family == AF_INET)
723 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
726 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
727 optname = IP_MULTICAST_TTL;
731 if (setsockopt (se->fd, IPPROTO_IP, optname,
733 sizeof (network_config_ttl)) == -1)
736 ERROR ("setsockopt: %s",
737 sstrerror (errno, errbuf, sizeof (errbuf)));
741 else if (ai->ai_family == AF_INET6)
743 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
744 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
747 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
748 optname = IPV6_MULTICAST_HOPS;
750 optname = IPV6_UNICAST_HOPS;
752 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
754 sizeof (network_config_ttl)) == -1)
757 ERROR ("setsockopt: %s",
758 sstrerror (errno, errbuf,
765 } /* int network_set_ttl */
767 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
771 DEBUG ("fd = %i; calling `bind'", se->fd);
773 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
777 sstrerror (errno, errbuf, sizeof (errbuf)));
781 if (ai->ai_family == AF_INET)
783 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
784 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
788 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
790 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
791 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
793 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
794 &loop, sizeof (loop)) == -1)
797 ERROR ("setsockopt: %s",
798 sstrerror (errno, errbuf,
803 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
804 &mreq, sizeof (mreq)) == -1)
807 ERROR ("setsockopt: %s",
808 sstrerror (errno, errbuf,
814 else if (ai->ai_family == AF_INET6)
816 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
817 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
818 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
820 struct ipv6_mreq mreq;
822 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
824 memcpy (&mreq.ipv6mr_multiaddr,
826 sizeof (addr->sin6_addr));
828 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
829 * ipv6mr_interface may be set to zeroes to
830 * choose the default multicast interface or to
831 * the index of a particular multicast-capable
832 * interface if the host is multihomed.
833 * Membership is associ-associated with a
834 * single interface; programs running on
835 * multihomed hosts may need to join the same
836 * group on more than one interface.*/
837 mreq.ipv6mr_interface = 0;
839 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
840 &loop, sizeof (loop)) == -1)
843 ERROR ("setsockopt: %s",
844 sstrerror (errno, errbuf,
849 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
850 &mreq, sizeof (mreq)) == -1)
853 ERROR ("setsockopt: %s",
854 sstrerror (errno, errbuf,
862 } /* int network_bind_socket */
864 static sockent_t *network_create_socket (const char *node,
868 struct addrinfo ai_hints;
869 struct addrinfo *ai_list, *ai_ptr;
872 sockent_t *se_head = NULL;
873 sockent_t *se_tail = NULL;
875 DEBUG ("node = %s, service = %s", node, service);
877 memset (&ai_hints, '\0', sizeof (ai_hints));
878 ai_hints.ai_flags = 0;
880 ai_hints.ai_flags |= AI_PASSIVE;
883 ai_hints.ai_flags |= AI_ADDRCONFIG;
885 ai_hints.ai_family = AF_UNSPEC;
886 ai_hints.ai_socktype = SOCK_DGRAM;
887 ai_hints.ai_protocol = IPPROTO_UDP;
889 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
893 ERROR ("getaddrinfo (%s, %s): %s",
894 (node == NULL) ? "(null)" : node,
895 (service == NULL) ? "(null)" : service,
896 (ai_return == EAI_SYSTEM)
897 ? sstrerror (errno, errbuf, sizeof (errbuf))
898 : gai_strerror (ai_return));
902 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
906 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
910 sstrerror (errno, errbuf,
915 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
919 sstrerror (errno, errbuf,
925 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
926 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
927 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
928 se->addrlen = ai_ptr->ai_addrlen;
930 se->fd = socket (ai_ptr->ai_family,
932 ai_ptr->ai_protocol);
939 sstrerror (errno, errbuf,
948 if (network_bind_socket (se, ai_ptr) != 0)
956 else /* listen == 0 */
958 network_set_ttl (se, ai_ptr);
972 /* We don't open more than one write-socket per node/service pair.. */
977 freeaddrinfo (ai_list);
980 } /* sockent_t *network_create_socket */
982 static sockent_t *network_create_default_socket (int listen)
984 sockent_t *se_ptr = NULL;
985 sockent_t *se_head = NULL;
986 sockent_t *se_tail = NULL;
988 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
989 NET_DEFAULT_PORT, listen);
991 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
992 if ((listen == 0) && (se_ptr != NULL))
999 while (se_tail->next != NULL)
1000 se_tail = se_tail->next;
1003 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
1005 if (se_tail == NULL)
1008 se_tail->next = se_ptr;
1010 } /* sockent_t *network_create_default_socket */
1012 static int network_add_listen_socket (const char *node, const char *service)
1018 if (service == NULL)
1019 service = NET_DEFAULT_PORT;
1022 se = network_create_default_socket (1 /* listen == true */);
1024 se = network_create_socket (node, service, 1 /* listen == true */);
1029 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1032 listen_sockets = (struct pollfd *) realloc (listen_sockets,
1033 (listen_sockets_num + se_num)
1034 * sizeof (struct pollfd));
1036 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1038 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
1039 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
1040 listen_sockets[listen_sockets_num].revents = 0;
1041 listen_sockets_num++;
1046 } /* int network_add_listen_socket */
1048 static int network_add_sending_socket (const char *node, const char *service)
1053 if (service == NULL)
1054 service = NET_DEFAULT_PORT;
1057 se = network_create_default_socket (0 /* listen == false */);
1059 se = network_create_socket (node, service, 0 /* listen == false */);
1064 if (sending_sockets == NULL)
1066 sending_sockets = se;
1070 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
1075 } /* int network_get_listen_socket */
1077 static void *dispatch_thread (void *arg)
1081 receive_list_entry_t *ent;
1083 /* Lock and wait for more data to come in */
1084 pthread_mutex_lock (&receive_list_lock);
1085 while ((listen_loop == 0)
1086 && (receive_list_head == NULL))
1087 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1089 /* Remove the head entry and unlock */
1090 ent = receive_list_head;
1092 receive_list_head = ent->next;
1093 pthread_mutex_unlock (&receive_list_lock);
1095 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1096 * because we dispatch all missing packets before shutting down. */
1100 parse_packet (ent->data, ent->data_len);
1106 } /* void *receive_thread */
1108 static int network_receive (void)
1110 char buffer[BUFF_SIZE];
1116 if (listen_sockets_num == 0)
1117 network_add_listen_socket (NULL, NULL);
1119 if (listen_sockets_num == 0)
1121 ERROR ("network: Failed to open a listening socket.");
1125 while (listen_loop == 0)
1127 status = poll (listen_sockets, listen_sockets_num, -1);
1134 ERROR ("poll failed: %s",
1135 sstrerror (errno, errbuf, sizeof (errbuf)));
1139 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1141 receive_list_entry_t *ent;
1143 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1147 buffer_len = recv (listen_sockets[i].fd,
1148 buffer, sizeof (buffer),
1153 ERROR ("recv failed: %s",
1154 sstrerror (errno, errbuf,
1159 ent = malloc (sizeof (receive_list_entry_t));
1162 ERROR ("network plugin: malloc failed.");
1165 memset (ent, '\0', sizeof (receive_list_entry_t));
1167 /* Hopefully this be optimized out by the compiler. It
1168 * might help prevent stupid bugs in the future though.
1170 assert (sizeof (ent->data) == sizeof (buffer));
1172 memcpy (ent->data, buffer, buffer_len);
1173 ent->data_len = buffer_len;
1175 pthread_mutex_lock (&receive_list_lock);
1176 if (receive_list_head == NULL)
1178 receive_list_head = ent;
1179 receive_list_tail = ent;
1183 receive_list_tail->next = ent;
1184 receive_list_tail = ent;
1186 pthread_cond_signal (&receive_list_cond);
1187 pthread_mutex_unlock (&receive_list_lock);
1188 } /* for (listen_sockets) */
1189 } /* while (listen_loop == 0) */
1194 static void *receive_thread (void *arg)
1196 return (network_receive () ? (void *) 1 : (void *) 0);
1197 } /* void *receive_thread */
1199 static void network_send_buffer (const char *buffer, int buffer_len)
1204 DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1206 for (se = sending_sockets; se != NULL; se = se->next)
1210 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1211 (struct sockaddr *) se->addr, se->addrlen);
1217 ERROR ("network plugin: sendto failed: %s",
1218 sstrerror (errno, errbuf,
1225 } /* for (sending_sockets) */
1226 } /* void network_send_buffer */
1228 static int add_to_buffer (char *buffer, int buffer_size,
1229 value_list_t *vl_def, char *type_def,
1230 const data_set_t *ds, const value_list_t *vl)
1232 char *buffer_orig = buffer;
1234 if (strcmp (vl_def->host, vl->host) != 0)
1236 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1237 vl->host, strlen (vl->host)) != 0)
1239 strcpy (vl_def->host, vl->host);
1242 if (vl_def->time != vl->time)
1244 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1245 (uint64_t) vl->time))
1247 vl_def->time = vl->time;
1250 if (vl_def->interval != vl->interval)
1252 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
1253 (uint64_t) vl->interval))
1255 vl_def->interval = vl->interval;
1258 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1260 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1261 vl->plugin, strlen (vl->plugin)) != 0)
1263 strcpy (vl_def->plugin, vl->plugin);
1266 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1268 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1269 vl->plugin_instance,
1270 strlen (vl->plugin_instance)) != 0)
1272 strcpy (vl_def->plugin_instance, vl->plugin_instance);
1275 if (strcmp (type_def, ds->type) != 0)
1277 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1278 ds->type, strlen (ds->type)) != 0)
1280 strcpy (type_def, ds->type);
1283 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1285 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1287 strlen (vl->type_instance)) != 0)
1289 strcpy (vl_def->type_instance, vl->type_instance);
1292 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1295 return (buffer - buffer_orig);
1296 } /* int add_to_buffer */
1298 static void flush_buffer (void)
1300 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1303 network_send_buffer (send_buffer, send_buffer_fill);
1304 send_buffer_ptr = send_buffer;
1305 send_buffer_fill = 0;
1306 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1307 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1310 static int network_write (const data_set_t *ds, const value_list_t *vl)
1314 /* If the value is already in the cache, we have received it via the
1315 * network. We write it again if forwarding is activated. It's then in
1316 * the cache and should we receive it again we will ignore it. */
1317 status = cache_check (ds->type, vl);
1318 if ((network_config_forward == 0)
1322 pthread_mutex_lock (&send_buffer_lock);
1324 status = add_to_buffer (send_buffer_ptr,
1325 sizeof (send_buffer) - send_buffer_fill,
1326 &send_buffer_vl, send_buffer_type,
1330 /* status == bytes added to the buffer */
1331 send_buffer_fill += status;
1332 send_buffer_ptr += status;
1338 status = add_to_buffer (send_buffer_ptr,
1339 sizeof (send_buffer) - send_buffer_fill,
1340 &send_buffer_vl, send_buffer_type,
1345 send_buffer_fill += status;
1346 send_buffer_ptr += status;
1352 ERROR ("network plugin: Unable to append to the "
1353 "buffer for some weird reason");
1355 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1360 pthread_mutex_unlock (&send_buffer_lock);
1362 return ((status < 0) ? -1 : 0);
1363 } /* int network_write */
1365 static int network_config (const char *key, const char *val)
1373 if ((strcasecmp ("Listen", key) == 0)
1374 || (strcasecmp ("Server", key) == 0))
1376 char *val_cpy = strdup (val);
1377 if (val_cpy == NULL)
1380 service = NET_DEFAULT_PORT;
1381 fields_num = strsplit (val_cpy, fields, 3);
1382 if ((fields_num != 1)
1383 && (fields_num != 2))
1385 else if (fields_num == 2)
1387 if ((service = strchr (fields[1], '.')) != NULL)
1389 service = fields[1];
1393 if (strcasecmp ("Listen", key) == 0)
1394 network_add_listen_socket (node, service);
1396 network_add_sending_socket (node, service);
1398 else if (strcasecmp ("TimeToLive", key) == 0)
1400 int tmp = atoi (val);
1401 if ((tmp > 0) && (tmp < 256))
1402 network_config_ttl = tmp;
1406 else if (strcasecmp ("Forward", key) == 0)
1408 if ((strcasecmp ("true", val) == 0)
1409 || (strcasecmp ("yes", val) == 0)
1410 || (strcasecmp ("on", val) == 0))
1411 network_config_forward = 1;
1413 network_config_forward = 0;
1415 else if (strcasecmp ("CacheFlush", key) == 0)
1417 int tmp = atoi (val);
1419 cache_flush_interval = tmp;
1427 } /* int network_config */
1429 static int network_shutdown (void)
1433 /* Kill the listening thread */
1434 if (receive_thread_id != (pthread_t) 0)
1436 pthread_kill (receive_thread_id, SIGTERM);
1437 pthread_join (receive_thread_id, NULL /* no return value */);
1438 receive_thread_id = (pthread_t) 0;
1441 /* Shutdown the dispatching thread */
1442 if (dispatch_thread_id != (pthread_t) 0)
1443 pthread_cond_broadcast (&receive_list_cond);
1445 if (send_buffer_fill > 0)
1448 if (cache_tree != NULL)
1453 while (c_avl_pick (cache_tree, &key, &value) == 0)
1458 c_avl_destroy (cache_tree);
1462 /* TODO: Close `sending_sockets' */
1464 plugin_unregister_config ("network");
1465 plugin_unregister_init ("network");
1466 plugin_unregister_write ("network");
1467 plugin_unregister_shutdown ("network");
1470 } /* int network_shutdown */
1472 static int network_init (void)
1474 plugin_register_shutdown ("network", network_shutdown);
1476 send_buffer_ptr = send_buffer;
1477 send_buffer_fill = 0;
1478 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1479 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1481 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1482 cache_flush_last = time (NULL);
1484 /* setup socket(s) and so on */
1485 if (sending_sockets != NULL)
1486 plugin_register_write ("network", network_write);
1488 if ((listen_sockets_num != 0) && (receive_thread_id == 0))
1492 status = pthread_create (&dispatch_thread_id,
1493 NULL /* no attributes */,
1495 NULL /* no argument */);
1499 ERROR ("network: pthread_create failed: %s",
1500 sstrerror (errno, errbuf,
1504 status = pthread_create (&receive_thread_id,
1505 NULL /* no attributes */,
1507 NULL /* no argument */);
1511 ERROR ("network: pthread_create failed: %s",
1512 sstrerror (errno, errbuf,
1517 } /* int network_init */
1519 void module_register (void)
1521 plugin_register_config ("network", network_config,
1522 config_keys, config_keys_num);
1523 plugin_register_init ("network", network_init);
1524 } /* void module_register */