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;
142 static const char *config_keys[] =
150 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
152 static int network_config_ttl = 0;
153 static int network_config_forward = 0;
155 static sockent_t *sending_sockets = NULL;
157 static struct pollfd *listen_sockets = NULL;
158 static int listen_sockets_num = 0;
159 static pthread_t listen_thread = 0;
160 static int listen_loop = 0;
162 static char send_buffer[BUFF_SIZE];
163 static char *send_buffer_ptr;
164 static int send_buffer_fill;
165 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
166 static char send_buffer_type[DATA_MAX_NAME_LEN];
167 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
169 static avl_tree_t *cache_tree = NULL;
170 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
171 static time_t cache_flush_last;
172 static int cache_flush_interval = 1800;
177 static int cache_flush (void)
187 avl_iterator_t *iter;
189 time_t curtime = time (NULL);
191 iter = avl_get_iterator (cache_tree);
192 while (avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
194 if ((curtime - *value) <= cache_flush_interval)
196 tmp = (char **) realloc (keys,
197 (keys_num + 1) * sizeof (char *));
201 avl_iterator_destroy (iter);
202 ERROR ("network plugin: cache_flush: realloc"
207 keys[keys_num] = key;
209 } /* while (avl_iterator_next) */
210 avl_iterator_destroy (iter);
212 for (i = 0; i < keys_num; i++)
214 if (avl_remove (cache_tree, keys[i], (void *) &key,
215 (void *) &value) != 0)
217 WARNING ("network plugin: cache_flush: avl_remove"
218 " (%s) failed.", keys[i]);
228 DEBUG ("network plugin: cache_flush: Removed %i %s",
229 keys_num, (keys_num == 1) ? "entry" : "entries");
230 cache_flush_last = curtime;
232 } /* int cache_flush */
234 static int cache_check (const char *type, const value_list_t *vl)
237 time_t *value = NULL;
240 if (cache_tree == NULL)
243 if (format_name (key, sizeof (key), vl->host, vl->plugin,
244 vl->plugin_instance, type, vl->type_instance))
247 pthread_mutex_lock (&cache_lock);
249 if (avl_get (cache_tree, key, (void *) &value) == 0)
251 if (*value < vl->time)
258 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
259 (int) *value, (int) vl->time);
265 char *key_copy = strdup (key);
266 value = malloc (sizeof (time_t));
267 if ((key_copy != NULL) && (value != NULL))
270 avl_insert (cache_tree, key_copy, value);
280 if ((time (NULL) - cache_flush_last) > cache_flush_interval)
283 pthread_mutex_unlock (&cache_lock);
285 DEBUG ("network plugin: cache_check: key = %s; time = %i; retval = %i",
286 key, (int) vl->time, retval);
289 } /* int cache_check */
291 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
292 const data_set_t *ds, const value_list_t *vl)
297 i = 6 + (9 * vl->values_len);
298 if (*ret_buffer_len < i)
300 *ret_buffer_len -= i;
302 pv.head = (part_header_t *) *ret_buffer;
303 pv.num_values = (uint16_t *) (pv.head + 1);
304 pv.values_types = (uint8_t *) (pv.num_values + 1);
305 pv.values = (value_t *) (pv.values_types + vl->values_len);
306 *ret_buffer = (void *) (pv.values + vl->values_len);
308 pv.head->type = htons (TYPE_VALUES);
309 pv.head->length = htons (6 + (9 * vl->values_len));
310 *pv.num_values = htons ((uint16_t) vl->values_len);
312 for (i = 0; i < vl->values_len; i++)
314 if (ds->ds[i].type == DS_TYPE_COUNTER)
316 pv.values_types[i] = DS_TYPE_COUNTER;
317 pv.values[i].counter = htonll (vl->values[i].counter);
321 pv.values_types[i] = DS_TYPE_GAUGE;
322 pv.values[i].gauge = vl->values[i].gauge;
327 } /* int write_part_values */
329 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
330 int type, uint64_t value)
334 if (*ret_buffer_len < 12)
337 pn.head = (part_header_t *) *ret_buffer;
338 pn.value = (uint64_t *) (pn.head + 1);
340 pn.head->type = htons (type);
341 pn.head->length = htons (12);
342 *pn.value = htonll (value);
344 *ret_buffer = (char *) (pn.value + 1);
345 *ret_buffer_len -= 12;
348 } /* int write_part_number */
350 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
351 int type, const char *str, int str_len)
356 len = 4 + str_len + 1;
357 if (*ret_buffer_len < len)
359 *ret_buffer_len -= len;
361 ps.head = (part_header_t *) *ret_buffer;
362 ps.value = (char *) (ps.head + 1);
364 ps.head->type = htons ((uint16_t) type);
365 ps.head->length = htons ((uint16_t) str_len + 5);
367 memcpy (ps.value, str, str_len);
368 ps.value[str_len] = '\0';
369 *ret_buffer = (void *) (ps.value + (str_len + 1));
372 } /* int write_part_string */
374 static int parse_part_values (void **ret_buffer, int *ret_buffer_len,
375 value_t **ret_values, int *ret_num_values)
377 char *buffer = *ret_buffer;
378 int buffer_len = *ret_buffer_len;
386 if (buffer_len < (15))
388 DEBUG ("network plugin: packet is too short: buffer_len = %i",
393 pv.head = (part_header_t *) buffer;
394 h_length = ntohs (pv.head->length);
395 h_type = ntohs (pv.head->type);
397 assert (h_type == TYPE_VALUES);
399 pv.num_values = (uint16_t *) (pv.head + 1);
400 h_num = ntohs (*pv.num_values);
402 if (h_num != ((h_length - 6) / 9))
404 DEBUG ("`length' and `num of values' don't match");
408 pv.values_types = (uint8_t *) (pv.num_values + 1);
409 pv.values = (value_t *) (pv.values_types + h_num);
411 for (i = 0; i < h_num; i++)
412 if (pv.values_types[i] == DS_TYPE_COUNTER)
413 pv.values[i].counter = ntohll (pv.values[i].counter);
415 *ret_buffer = (void *) (pv.values + h_num);
416 *ret_buffer_len = buffer_len - h_length;
417 *ret_num_values = h_num;
418 *ret_values = pv.values;
421 } /* int parse_part_values */
423 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
429 pn.head = (part_header_t *) *ret_buffer;
430 pn.value = (uint64_t *) (pn.head + 1);
432 len = ntohs (pn.head->length);
435 if (len > *ret_buffer_len)
437 *value = ntohll (*pn.value);
439 *ret_buffer = (void *) (pn.value + 1);
440 *ret_buffer_len -= len;
443 } /* int parse_part_number */
445 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
446 char *output, int output_len)
448 char *buffer = *ret_buffer;
449 int buffer_len = *ret_buffer_len;
455 DEBUG ("network plugin: parse_part_string: ret_buffer = %p;"
456 " ret_buffer_len = %i; output = %p; output_len = %i;",
457 *ret_buffer, *ret_buffer_len,
458 (void *) output, output_len);
460 ps.head = (part_header_t *) buffer;
462 h_length = ntohs (ps.head->length);
463 h_type = ntohs (ps.head->type);
465 DEBUG ("network plugin: parse_part_string: length = %hu; type = %hu;",
468 if (buffer_len < h_length)
470 DEBUG ("packet is too short");
473 assert ((h_type == TYPE_HOST)
474 || (h_type == TYPE_PLUGIN)
475 || (h_type == TYPE_PLUGIN_INSTANCE)
476 || (h_type == TYPE_TYPE)
477 || (h_type == TYPE_TYPE_INSTANCE));
479 ps.value = buffer + 4;
480 if (ps.value[h_length - 5] != '\0')
482 DEBUG ("String does not end with a nullbyte");
486 if (output_len < (h_length - 4))
488 DEBUG ("output buffer is too small");
491 strcpy (output, ps.value);
493 DEBUG ("network plugin: parse_part_string: output = %s", output);
495 *ret_buffer = (void *) (buffer + h_length);
496 *ret_buffer_len = buffer_len - h_length;
499 } /* int parse_part_string */
501 static int parse_packet (void *buffer, int buffer_len)
503 part_header_t *header;
506 value_list_t vl = VALUE_LIST_INIT;
507 char type[DATA_MAX_NAME_LEN];
509 DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
512 memset (&vl, '\0', sizeof (vl));
513 memset (&type, '\0', sizeof (type));
516 while ((status == 0) && (buffer_len > sizeof (part_header_t)))
518 header = (part_header_t *) buffer;
520 if (ntohs (header->length) > buffer_len)
522 /* Assure that this loop terminates eventually */
523 if (ntohs (header->length) < 4)
526 if (ntohs (header->type) == TYPE_VALUES)
528 status = parse_part_values (&buffer, &buffer_len,
529 &vl.values, &vl.values_len);
533 DEBUG ("parse_part_values failed.");
538 && (strlen (vl.host) > 0)
539 && (strlen (vl.plugin) > 0)
540 && (strlen (type) > 0)
541 && (cache_check (type, &vl) == 0))
543 DEBUG ("network plugin: parse_packet:"
544 " dispatching values");
545 plugin_dispatch_values (type, &vl);
549 DEBUG ("network plugin: parse_packet:"
550 " NOT dispatching values");
553 else if (ntohs (header->type) == TYPE_TIME)
556 status = parse_part_number (&buffer, &buffer_len, &tmp);
558 vl.time = (time_t) tmp;
560 else if (ntohs (header->type) == TYPE_INTERVAL)
563 status = parse_part_number (&buffer, &buffer_len, &tmp);
565 vl.interval = (int) tmp;
567 else if (ntohs (header->type) == TYPE_HOST)
569 status = parse_part_string (&buffer, &buffer_len,
570 vl.host, sizeof (vl.host));
571 DEBUG ("network plugin: parse_packet: vl.host = %s", vl.host);
573 else if (ntohs (header->type) == TYPE_PLUGIN)
575 status = parse_part_string (&buffer, &buffer_len,
576 vl.plugin, sizeof (vl.plugin));
577 DEBUG ("network plugin: parse_packet: vl.plugin = %s", vl.plugin);
579 else if (ntohs (header->type) == TYPE_PLUGIN_INSTANCE)
581 status = parse_part_string (&buffer, &buffer_len,
582 vl.plugin_instance, sizeof (vl.plugin_instance));
583 DEBUG ("network plugin: parse_packet: vl.plugin_instance = %s", vl.plugin_instance);
585 else if (ntohs (header->type) == TYPE_TYPE)
587 status = parse_part_string (&buffer, &buffer_len,
588 type, sizeof (type));
589 DEBUG ("network plugin: parse_packet: type = %s", type);
591 else if (ntohs (header->type) == TYPE_TYPE_INSTANCE)
593 status = parse_part_string (&buffer, &buffer_len,
594 vl.type_instance, sizeof (vl.type_instance));
595 DEBUG ("network plugin: parse_packet: vl.type_instance = %s", vl.type_instance);
599 DEBUG ("network plugin: parse_packet: Unknown part"
600 " type: 0x%0hx", ntohs (header->type));
601 buffer = ((char *) buffer) + ntohs (header->length);
603 } /* while (buffer_len > sizeof (part_header_t)) */
606 } /* int parse_packet */
608 static void free_sockent (sockent_t *se)
618 } /* void free_sockent */
621 * int network_set_ttl
623 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
624 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
626 * The `struct addrinfo' is used to destinguish between unicast and multicast
629 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
631 if ((network_config_ttl < 1) || (network_config_ttl > 255))
634 DEBUG ("ttl = %i", network_config_ttl);
636 if (ai->ai_family == AF_INET)
638 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
641 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
642 optname = IP_MULTICAST_TTL;
646 if (setsockopt (se->fd, IPPROTO_IP, optname,
648 sizeof (network_config_ttl)) == -1)
651 ERROR ("setsockopt: %s",
652 sstrerror (errno, errbuf, sizeof (errbuf)));
656 else if (ai->ai_family == AF_INET6)
658 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
659 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
662 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
663 optname = IPV6_MULTICAST_HOPS;
665 optname = IPV6_UNICAST_HOPS;
667 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
669 sizeof (network_config_ttl)) == -1)
672 ERROR ("setsockopt: %s",
673 sstrerror (errno, errbuf,
680 } /* int network_set_ttl */
682 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
686 DEBUG ("fd = %i; calling `bind'", se->fd);
688 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
692 sstrerror (errno, errbuf, sizeof (errbuf)));
696 if (ai->ai_family == AF_INET)
698 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
699 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
703 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
705 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
706 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
708 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
709 &loop, sizeof (loop)) == -1)
712 ERROR ("setsockopt: %s",
713 sstrerror (errno, errbuf,
718 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
719 &mreq, sizeof (mreq)) == -1)
722 ERROR ("setsockopt: %s",
723 sstrerror (errno, errbuf,
729 else if (ai->ai_family == AF_INET6)
731 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
732 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
733 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
735 struct ipv6_mreq mreq;
737 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
739 memcpy (&mreq.ipv6mr_multiaddr,
741 sizeof (addr->sin6_addr));
743 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
744 * ipv6mr_interface may be set to zeroes to
745 * choose the default multicast interface or to
746 * the index of a particular multicast-capable
747 * interface if the host is multihomed.
748 * Membership is associ-associated with a
749 * single interface; programs running on
750 * multihomed hosts may need to join the same
751 * group on more than one interface.*/
752 mreq.ipv6mr_interface = 0;
754 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
755 &loop, sizeof (loop)) == -1)
758 ERROR ("setsockopt: %s",
759 sstrerror (errno, errbuf,
764 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
765 &mreq, sizeof (mreq)) == -1)
768 ERROR ("setsockopt: %s",
769 sstrerror (errno, errbuf,
777 } /* int network_bind_socket */
779 static sockent_t *network_create_socket (const char *node,
783 struct addrinfo ai_hints;
784 struct addrinfo *ai_list, *ai_ptr;
787 sockent_t *se_head = NULL;
788 sockent_t *se_tail = NULL;
790 DEBUG ("node = %s, service = %s", node, service);
792 memset (&ai_hints, '\0', sizeof (ai_hints));
793 ai_hints.ai_flags = 0;
795 ai_hints.ai_flags |= AI_PASSIVE;
798 ai_hints.ai_flags |= AI_ADDRCONFIG;
800 ai_hints.ai_family = AF_UNSPEC;
801 ai_hints.ai_socktype = SOCK_DGRAM;
802 ai_hints.ai_protocol = IPPROTO_UDP;
804 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
808 ERROR ("getaddrinfo (%s, %s): %s",
809 (node == NULL) ? "(null)" : node,
810 (service == NULL) ? "(null)" : service,
811 (ai_return == EAI_SYSTEM)
812 ? sstrerror (errno, errbuf, sizeof (errbuf))
813 : gai_strerror (ai_return));
817 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
821 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
825 sstrerror (errno, errbuf,
830 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
834 sstrerror (errno, errbuf,
840 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
841 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
842 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
843 se->addrlen = ai_ptr->ai_addrlen;
845 se->fd = socket (ai_ptr->ai_family,
847 ai_ptr->ai_protocol);
854 sstrerror (errno, errbuf,
863 if (network_bind_socket (se, ai_ptr) != 0)
871 else /* listen == 0 */
873 network_set_ttl (se, ai_ptr);
887 /* We don't open more than one write-socket per node/service pair.. */
892 freeaddrinfo (ai_list);
895 } /* sockent_t *network_create_socket */
897 static sockent_t *network_create_default_socket (int listen)
899 sockent_t *se_ptr = NULL;
900 sockent_t *se_head = NULL;
901 sockent_t *se_tail = NULL;
903 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
904 NET_DEFAULT_PORT, listen);
906 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
907 if ((listen == 0) && (se_ptr != NULL))
914 while (se_tail->next != NULL)
915 se_tail = se_tail->next;
918 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
923 se_tail->next = se_ptr;
925 } /* sockent_t *network_create_default_socket */
927 static int network_add_listen_socket (const char *node, const char *service)
934 service = NET_DEFAULT_PORT;
937 se = network_create_default_socket (1 /* listen == true */);
939 se = network_create_socket (node, service, 1 /* listen == true */);
944 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
947 listen_sockets = (struct pollfd *) realloc (listen_sockets,
948 (listen_sockets_num + se_num)
949 * sizeof (struct pollfd));
951 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
953 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
954 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
955 listen_sockets[listen_sockets_num].revents = 0;
956 listen_sockets_num++;
961 } /* int network_add_listen_socket */
963 static int network_add_sending_socket (const char *node, const char *service)
969 service = NET_DEFAULT_PORT;
972 se = network_create_default_socket (0 /* listen == false */);
974 se = network_create_socket (node, service, 0 /* listen == false */);
979 if (sending_sockets == NULL)
981 sending_sockets = se;
985 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
990 } /* int network_get_listen_socket */
992 int network_receive (void)
994 char buffer[BUFF_SIZE];
1000 if (listen_sockets_num == 0)
1001 network_add_listen_socket (NULL, NULL);
1003 if (listen_sockets_num == 0)
1005 ERROR ("network: Failed to open a listening socket.");
1009 while (listen_loop == 0)
1011 status = poll (listen_sockets, listen_sockets_num, -1);
1018 ERROR ("poll failed: %s",
1019 sstrerror (errno, errbuf, sizeof (errbuf)));
1023 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1025 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1029 buffer_len = recv (listen_sockets[i].fd,
1030 buffer, sizeof (buffer),
1035 ERROR ("recv failed: %s",
1036 sstrerror (errno, errbuf,
1041 parse_packet (buffer, buffer_len);
1042 } /* for (listen_sockets) */
1043 } /* while (listen_loop == 0) */
1048 static void *receive_thread (void *arg)
1050 return (network_receive () ? (void *) 1 : (void *) 0);
1051 } /* void *receive_thread */
1053 static void network_send_buffer (const char *buffer, int buffer_len)
1058 DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1060 for (se = sending_sockets; se != NULL; se = se->next)
1064 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1065 (struct sockaddr *) se->addr, se->addrlen);
1071 ERROR ("network plugin: sendto failed: %s",
1072 sstrerror (errno, errbuf,
1079 } /* for (sending_sockets) */
1080 } /* void network_send_buffer */
1082 static int add_to_buffer (char *buffer, int buffer_size,
1083 value_list_t *vl_def, char *type_def,
1084 const data_set_t *ds, const value_list_t *vl)
1086 char *buffer_orig = buffer;
1088 if (strcmp (vl_def->host, vl->host) != 0)
1090 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1091 vl->host, strlen (vl->host)) != 0)
1093 strcpy (vl_def->host, vl->host);
1096 if (vl_def->time != vl->time)
1098 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1099 (uint64_t) vl->time))
1101 vl_def->time = vl->time;
1104 if (vl_def->interval != vl->interval)
1106 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
1107 (uint64_t) vl->interval))
1109 vl_def->interval = vl->interval;
1112 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1114 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1115 vl->plugin, strlen (vl->plugin)) != 0)
1117 strcpy (vl_def->plugin, vl->plugin);
1120 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1122 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1123 vl->plugin_instance,
1124 strlen (vl->plugin_instance)) != 0)
1126 strcpy (vl_def->plugin_instance, vl->plugin_instance);
1129 if (strcmp (type_def, ds->type) != 0)
1131 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1132 ds->type, strlen (ds->type)) != 0)
1134 strcpy (type_def, ds->type);
1137 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1139 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1141 strlen (vl->type_instance)) != 0)
1143 strcpy (vl_def->type_instance, vl->type_instance);
1146 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1149 return (buffer - buffer_orig);
1150 } /* int add_to_buffer */
1152 static void flush_buffer (void)
1154 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1157 network_send_buffer (send_buffer, send_buffer_fill);
1158 send_buffer_ptr = send_buffer;
1159 send_buffer_fill = 0;
1160 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1161 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1164 static int network_write (const data_set_t *ds, const value_list_t *vl)
1168 /* If the value is already in the cache, we have received it via the
1169 * network. We write it again if forwarding is activated. It's then in
1170 * the cache and should we receive it again we will ignore it. */
1171 status = cache_check (ds->type, vl);
1172 if ((network_config_forward == 0)
1176 pthread_mutex_lock (&send_buffer_lock);
1178 status = add_to_buffer (send_buffer_ptr,
1179 sizeof (send_buffer) - send_buffer_fill,
1180 &send_buffer_vl, send_buffer_type,
1184 /* status == bytes added to the buffer */
1185 send_buffer_fill += status;
1186 send_buffer_ptr += status;
1192 status = add_to_buffer (send_buffer_ptr,
1193 sizeof (send_buffer) - send_buffer_fill,
1194 &send_buffer_vl, send_buffer_type,
1199 send_buffer_fill += status;
1200 send_buffer_ptr += status;
1206 ERROR ("network plugin: Unable to append to the "
1207 "buffer for some weird reason");
1209 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1214 pthread_mutex_unlock (&send_buffer_lock);
1216 return ((status < 0) ? -1 : 0);
1217 } /* int network_write */
1219 static int network_config (const char *key, const char *val)
1227 if ((strcasecmp ("Listen", key) == 0)
1228 || (strcasecmp ("Server", key) == 0))
1230 char *val_cpy = strdup (val);
1231 if (val_cpy == NULL)
1234 service = NET_DEFAULT_PORT;
1235 fields_num = strsplit (val_cpy, fields, 3);
1236 if ((fields_num != 1)
1237 && (fields_num != 2))
1239 else if (fields_num == 2)
1241 if ((service = strchr (fields[1], '.')) != NULL)
1243 service = fields[1];
1247 if (strcasecmp ("Listen", key) == 0)
1248 network_add_listen_socket (node, service);
1250 network_add_sending_socket (node, service);
1252 else if (strcasecmp ("TimeToLive", key) == 0)
1254 int tmp = atoi (val);
1255 if ((tmp > 0) && (tmp < 256))
1256 network_config_ttl = tmp;
1260 else if (strcasecmp ("Forward", key) == 0)
1262 if ((strcasecmp ("true", val) == 0)
1263 || (strcasecmp ("yes", val) == 0)
1264 || (strcasecmp ("on", val) == 0))
1265 network_config_forward = 1;
1267 network_config_forward = 0;
1269 else if (strcasecmp ("CacheFlush", key) == 0)
1271 int tmp = atoi (val);
1273 cache_flush_interval = tmp;
1281 } /* int network_config */
1283 static int network_shutdown (void)
1287 if (listen_thread != (pthread_t) 0)
1289 pthread_kill (listen_thread, SIGTERM);
1290 pthread_join (listen_thread, NULL /* no return value */);
1291 listen_thread = (pthread_t) 0;
1294 if (send_buffer_fill > 0)
1297 if (cache_tree != NULL)
1302 while (avl_pick (cache_tree, &key, &value) == 0)
1307 avl_destroy (cache_tree);
1311 /* TODO: Close `sending_sockets' */
1313 plugin_unregister_config ("network");
1314 plugin_unregister_init ("network");
1315 plugin_unregister_write ("network");
1316 plugin_unregister_shutdown ("network");
1319 } /* int network_shutdown */
1321 static int network_init (void)
1323 plugin_register_shutdown ("network", network_shutdown);
1325 send_buffer_ptr = send_buffer;
1326 send_buffer_fill = 0;
1327 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1328 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1330 cache_tree = avl_create ((int (*) (const void *, const void *)) strcmp);
1331 cache_flush_last = time (NULL);
1333 /* setup socket(s) and so on */
1334 if (sending_sockets != NULL)
1335 plugin_register_write ("network", network_write);
1337 if ((listen_sockets_num != 0) && (listen_thread == 0))
1341 status = pthread_create (&listen_thread, NULL /* no attributes */,
1342 receive_thread, NULL /* no argument */);
1347 ERROR ("network: pthread_create failed: %s",
1348 sstrerror (errno, errbuf,
1353 } /* int network_init */
1355 void module_register (void)
1357 plugin_register_config ("network", network_config,
1358 config_keys, config_keys_num);
1359 plugin_register_init ("network", network_init);
1360 } /* void module_register */