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1 /**
2 * collectd - src/network.c
3 * Copyright (C) 2005-2007 Florian octo Forster
4 *
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.
8 *
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.
13 *
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
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "plugin.h"
24 #include "common.h"
25 #include "configfile.h"
26 #include "utils_avltree.h"
28 #include "network.h"
30 #if HAVE_PTHREAD_H
31 # include <pthread.h>
32 #endif
33 #if HAVE_SYS_SOCKET_H
34 # include <sys/socket.h>
35 #endif
36 #if HAVE_NETDB_H
37 # include <netdb.h>
38 #endif
39 #if HAVE_NETINET_IN_H
40 # include <netinet/in.h>
41 #endif
42 #if HAVE_ARPA_INET_H
43 # include <arpa/inet.h>
44 #endif
45 #if HAVE_POLL_H
46 # include <poll.h>
47 #endif
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
55 # else
56 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
57 # endif
58 #endif /* !IP_ADD_MEMBERSHIP */
60 #define BUFF_SIZE 1024
62 /*
63 * Private data types
64 */
65 typedef struct sockent
66 {
67 int fd;
68 struct sockaddr_storage *addr;
69 socklen_t addrlen;
70 struct sockent *next;
71 } sockent_t;
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 * +-------+-----------------------+-------------------------------+
76 * ! Ver. ! ! Length !
77 * +-------+-----------------------+-------------------------------+
78 */
79 struct part_header_s
80 {
81 uint16_t type;
82 uint16_t length;
83 };
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 * +-------------------------------+-------------------------------+
89 * ! Type ! Length !
90 * +-------------------------------+-------------------------------+
91 * : (Length - 4) Bytes :
92 * +---------------------------------------------------------------+
93 */
94 struct part_string_s
95 {
96 part_header_t *head;
97 char *value;
98 };
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 * +-------------------------------+-------------------------------+
104 * ! Type ! Length !
105 * +-------------------------------+-------------------------------+
106 * : (Length - 4 == 2 || 4 || 8) Bytes :
107 * +---------------------------------------------------------------+
108 */
109 struct part_number_s
110 {
111 part_header_t *head;
112 uint64_t *value;
113 };
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 * +-------------------------------+-------------------------------+
119 * ! Type ! Length !
120 * +-------------------------------+---------------+---------------+
121 * ! Num of values ! Type0 ! Type1 !
122 * +-------------------------------+---------------+---------------+
123 * ! Value0 !
124 * ! !
125 * +---------------------------------------------------------------+
126 * ! Value1 !
127 * ! !
128 * +---------------------------------------------------------------+
129 */
130 struct part_values_s
131 {
132 part_header_t *head;
133 uint16_t *num_values;
134 uint8_t *values_types;
135 value_t *values;
136 };
137 typedef struct part_values_s part_values_t;
139 /*
140 * Private variables
141 */
142 static const char *config_keys[] =
143 {
144 "CacheFlush",
145 "Listen",
146 "Server",
147 "TimeToLive",
148 "Forward"
149 };
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 c_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;
174 /*
175 * Private functions
176 */
177 static int cache_flush (void)
178 {
179 char **keys = NULL;
180 int keys_num = 0;
182 char **tmp;
183 int i;
185 char *key;
186 time_t *value;
187 c_avl_iterator_t *iter;
189 time_t curtime = time (NULL);
191 iter = c_avl_get_iterator (cache_tree);
192 while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
193 {
194 if ((curtime - *value) <= cache_flush_interval)
195 continue;
196 tmp = (char **) realloc (keys,
197 (keys_num + 1) * sizeof (char *));
198 if (tmp == NULL)
199 {
200 sfree (keys);
201 c_avl_iterator_destroy (iter);
202 ERROR ("network plugin: cache_flush: realloc"
203 " failed.");
204 return (-1);
205 }
206 keys = tmp;
207 keys[keys_num] = key;
208 keys_num++;
209 } /* while (c_avl_iterator_next) */
210 c_avl_iterator_destroy (iter);
212 for (i = 0; i < keys_num; i++)
213 {
214 if (c_avl_remove (cache_tree, keys[i], (void *) &key,
215 (void *) &value) != 0)
216 {
217 WARNING ("network plugin: cache_flush: c_avl_remove"
218 " (%s) failed.", keys[i]);
219 continue;
220 }
222 sfree (key);
223 sfree (value);
224 }
226 sfree (keys);
228 DEBUG ("network plugin: cache_flush: Removed %i %s",
229 keys_num, (keys_num == 1) ? "entry" : "entries");
230 cache_flush_last = curtime;
231 return (0);
232 } /* int cache_flush */
234 static int cache_check (const char *type, const value_list_t *vl)
235 {
236 char key[1024];
237 time_t *value = NULL;
238 int retval = -1;
240 if (cache_tree == NULL)
241 return (-1);
243 if (format_name (key, sizeof (key), vl->host, vl->plugin,
244 vl->plugin_instance, type, vl->type_instance))
245 return (-1);
247 pthread_mutex_lock (&cache_lock);
249 if (c_avl_get (cache_tree, key, (void *) &value) == 0)
250 {
251 if (*value < vl->time)
252 {
253 *value = vl->time;
254 retval = 0;
255 }
256 else
257 {
258 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
259 (int) *value, (int) vl->time);
260 retval = 1;
261 }
262 }
263 else
264 {
265 char *key_copy = strdup (key);
266 value = malloc (sizeof (time_t));
267 if ((key_copy != NULL) && (value != NULL))
268 {
269 *value = vl->time;
270 c_avl_insert (cache_tree, key_copy, value);
271 retval = 0;
272 }
273 else
274 {
275 sfree (key_copy);
276 sfree (value);
277 }
278 }
280 if ((time (NULL) - cache_flush_last) > cache_flush_interval)
281 cache_flush ();
283 pthread_mutex_unlock (&cache_lock);
285 DEBUG ("network plugin: cache_check: key = %s; time = %i; retval = %i",
286 key, (int) vl->time, retval);
288 return (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)
293 {
294 part_values_t pv;
295 int i;
297 i = 6 + (9 * vl->values_len);
298 if (*ret_buffer_len < i)
299 return (-1);
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++)
313 {
314 if (ds->ds[i].type == DS_TYPE_COUNTER)
315 {
316 pv.values_types[i] = DS_TYPE_COUNTER;
317 pv.values[i].counter = htonll (vl->values[i].counter);
318 }
319 else
320 {
321 pv.values_types[i] = DS_TYPE_GAUGE;
322 pv.values[i].gauge = vl->values[i].gauge;
323 }
324 } /* for (values) */
326 return (0);
327 } /* int write_part_values */
329 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
330 int type, uint64_t value)
331 {
332 part_number_t pn;
334 if (*ret_buffer_len < 12)
335 return (-1);
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;
347 return (0);
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)
352 {
353 part_string_t ps;
354 int len;
356 len = 4 + str_len + 1;
357 if (*ret_buffer_len < len)
358 return (-1);
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);
366 if (str_len > 0)
367 memcpy (ps.value, str, str_len);
368 ps.value[str_len] = '\0';
369 *ret_buffer = (void *) (ps.value + (str_len + 1));
371 return (0);
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)
376 {
377 char *buffer = *ret_buffer;
378 int buffer_len = *ret_buffer_len;
379 part_values_t pv;
380 int i;
382 uint16_t h_length;
383 uint16_t h_type;
384 uint16_t h_num;
386 if (buffer_len < (15))
387 {
388 DEBUG ("network plugin: packet is too short: buffer_len = %i",
389 buffer_len);
390 return (-1);
391 }
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))
403 {
404 DEBUG ("`length' and `num of values' don't match");
405 return (-1);
406 }
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;
420 return (0);
421 } /* int parse_part_values */
423 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
424 uint64_t *value)
425 {
426 part_number_t pn;
427 uint16_t len;
429 pn.head = (part_header_t *) *ret_buffer;
430 pn.value = (uint64_t *) (pn.head + 1);
432 len = ntohs (pn.head->length);
433 if (len != 12)
434 return (-1);
435 if (len > *ret_buffer_len)
436 return (-1);
437 *value = ntohll (*pn.value);
439 *ret_buffer = (void *) (pn.value + 1);
440 *ret_buffer_len -= len;
442 return (0);
443 } /* int parse_part_number */
445 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
446 char *output, int output_len)
447 {
448 char *buffer = *ret_buffer;
449 int buffer_len = *ret_buffer_len;
450 part_string_t ps;
452 uint16_t h_length;
453 uint16_t h_type;
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;",
466 h_length, h_type);
468 if (buffer_len < h_length)
469 {
470 DEBUG ("packet is too short");
471 return (-1);
472 }
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')
481 {
482 DEBUG ("String does not end with a nullbyte");
483 return (-1);
484 }
486 if (output_len < (h_length - 4))
487 {
488 DEBUG ("output buffer is too small");
489 return (-1);
490 }
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;
498 return (0);
499 } /* int parse_part_string */
501 static int parse_packet (void *buffer, int buffer_len)
502 {
503 part_header_t *header;
504 int status;
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;",
510 buffer, buffer_len);
512 memset (&vl, '\0', sizeof (vl));
513 memset (&type, '\0', sizeof (type));
514 status = 0;
516 while ((status == 0) && (0 < buffer_len)
517 && ((unsigned int)buffer_len > sizeof (part_header_t)))
518 {
519 header = (part_header_t *) buffer;
521 if (ntohs (header->length) > buffer_len)
522 break;
523 /* Assure that this loop terminates eventually */
524 if (ntohs (header->length) < 4)
525 break;
527 if (ntohs (header->type) == TYPE_VALUES)
528 {
529 status = parse_part_values (&buffer, &buffer_len,
530 &vl.values, &vl.values_len);
532 if (status != 0)
533 {
534 DEBUG ("parse_part_values failed.");
535 break;
536 }
538 if ((vl.time > 0)
539 && (strlen (vl.host) > 0)
540 && (strlen (vl.plugin) > 0)
541 && (strlen (type) > 0)
542 && (cache_check (type, &vl) == 0))
543 {
544 DEBUG ("network plugin: parse_packet:"
545 " dispatching values");
546 plugin_dispatch_values (type, &vl);
547 }
548 else
549 {
550 DEBUG ("network plugin: parse_packet:"
551 " NOT dispatching values");
552 }
553 }
554 else if (ntohs (header->type) == TYPE_TIME)
555 {
556 uint64_t tmp = 0;
557 status = parse_part_number (&buffer, &buffer_len, &tmp);
558 if (status == 0)
559 vl.time = (time_t) tmp;
560 }
561 else if (ntohs (header->type) == TYPE_INTERVAL)
562 {
563 uint64_t tmp = 0;
564 status = parse_part_number (&buffer, &buffer_len, &tmp);
565 if (status == 0)
566 vl.interval = (int) tmp;
567 }
568 else if (ntohs (header->type) == TYPE_HOST)
569 {
570 status = parse_part_string (&buffer, &buffer_len,
571 vl.host, sizeof (vl.host));
572 DEBUG ("network plugin: parse_packet: vl.host = %s", vl.host);
573 }
574 else if (ntohs (header->type) == TYPE_PLUGIN)
575 {
576 status = parse_part_string (&buffer, &buffer_len,
577 vl.plugin, sizeof (vl.plugin));
578 DEBUG ("network plugin: parse_packet: vl.plugin = %s", vl.plugin);
579 }
580 else if (ntohs (header->type) == TYPE_PLUGIN_INSTANCE)
581 {
582 status = parse_part_string (&buffer, &buffer_len,
583 vl.plugin_instance, sizeof (vl.plugin_instance));
584 DEBUG ("network plugin: parse_packet: vl.plugin_instance = %s", vl.plugin_instance);
585 }
586 else if (ntohs (header->type) == TYPE_TYPE)
587 {
588 status = parse_part_string (&buffer, &buffer_len,
589 type, sizeof (type));
590 DEBUG ("network plugin: parse_packet: type = %s", type);
591 }
592 else if (ntohs (header->type) == TYPE_TYPE_INSTANCE)
593 {
594 status = parse_part_string (&buffer, &buffer_len,
595 vl.type_instance, sizeof (vl.type_instance));
596 DEBUG ("network plugin: parse_packet: vl.type_instance = %s", vl.type_instance);
597 }
598 else
599 {
600 DEBUG ("network plugin: parse_packet: Unknown part"
601 " type: 0x%0hx", ntohs (header->type));
602 buffer = ((char *) buffer) + ntohs (header->length);
603 }
604 } /* while (buffer_len > sizeof (part_header_t)) */
606 return (0);
607 } /* int parse_packet */
609 static void free_sockent (sockent_t *se)
610 {
611 sockent_t *next;
612 while (se != NULL)
613 {
614 next = se->next;
615 free (se->addr);
616 free (se);
617 se = next;
618 }
619 } /* void free_sockent */
621 /*
622 * int network_set_ttl
623 *
624 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
625 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
626 *
627 * The `struct addrinfo' is used to destinguish between unicast and multicast
628 * sockets.
629 */
630 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
631 {
632 if ((network_config_ttl < 1) || (network_config_ttl > 255))
633 return (-1);
635 DEBUG ("ttl = %i", network_config_ttl);
637 if (ai->ai_family == AF_INET)
638 {
639 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
640 int optname;
642 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
643 optname = IP_MULTICAST_TTL;
644 else
645 optname = IP_TTL;
647 if (setsockopt (se->fd, IPPROTO_IP, optname,
648 &network_config_ttl,
649 sizeof (network_config_ttl)) == -1)
650 {
651 char errbuf[1024];
652 ERROR ("setsockopt: %s",
653 sstrerror (errno, errbuf, sizeof (errbuf)));
654 return (-1);
655 }
656 }
657 else if (ai->ai_family == AF_INET6)
658 {
659 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
660 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
661 int optname;
663 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
664 optname = IPV6_MULTICAST_HOPS;
665 else
666 optname = IPV6_UNICAST_HOPS;
668 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
669 &network_config_ttl,
670 sizeof (network_config_ttl)) == -1)
671 {
672 char errbuf[1024];
673 ERROR ("setsockopt: %s",
674 sstrerror (errno, errbuf,
675 sizeof (errbuf)));
676 return (-1);
677 }
678 }
680 return (0);
681 } /* int network_set_ttl */
683 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
684 {
685 int loop = 0;
686 int yes = 1;
688 /* allow multiple sockets to use the same PORT number */
689 if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR,
690 &yes, sizeof(yes)) == -1) {
691 char errbuf[1024];
692 ERROR ("setsockopt: %s",
693 sstrerror (errno, errbuf, sizeof (errbuf)));
694 return (-1);
695 }
697 DEBUG ("fd = %i; calling `bind'", se->fd);
699 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
700 {
701 char errbuf[1024];
702 ERROR ("bind: %s",
703 sstrerror (errno, errbuf, sizeof (errbuf)));
704 return (-1);
705 }
707 if (ai->ai_family == AF_INET)
708 {
709 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
710 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
711 {
712 struct ip_mreq mreq;
714 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
716 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
717 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
719 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
720 &loop, sizeof (loop)) == -1)
721 {
722 char errbuf[1024];
723 ERROR ("setsockopt: %s",
724 sstrerror (errno, errbuf,
725 sizeof (errbuf)));
726 return (-1);
727 }
729 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
730 &mreq, sizeof (mreq)) == -1)
731 {
732 char errbuf[1024];
733 ERROR ("setsockopt: %s",
734 sstrerror (errno, errbuf,
735 sizeof (errbuf)));
736 return (-1);
737 }
738 }
739 }
740 else if (ai->ai_family == AF_INET6)
741 {
742 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
743 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
744 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
745 {
746 struct ipv6_mreq mreq;
748 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
750 memcpy (&mreq.ipv6mr_multiaddr,
751 &addr->sin6_addr,
752 sizeof (addr->sin6_addr));
754 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
755 * ipv6mr_interface may be set to zeroes to
756 * choose the default multicast interface or to
757 * the index of a particular multicast-capable
758 * interface if the host is multihomed.
759 * Membership is associ-associated with a
760 * single interface; programs running on
761 * multihomed hosts may need to join the same
762 * group on more than one interface.*/
763 mreq.ipv6mr_interface = 0;
765 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
766 &loop, sizeof (loop)) == -1)
767 {
768 char errbuf[1024];
769 ERROR ("setsockopt: %s",
770 sstrerror (errno, errbuf,
771 sizeof (errbuf)));
772 return (-1);
773 }
775 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
776 &mreq, sizeof (mreq)) == -1)
777 {
778 char errbuf[1024];
779 ERROR ("setsockopt: %s",
780 sstrerror (errno, errbuf,
781 sizeof (errbuf)));
782 return (-1);
783 }
784 }
785 }
787 return (0);
788 } /* int network_bind_socket */
790 static sockent_t *network_create_socket (const char *node,
791 const char *service,
792 int listen)
793 {
794 struct addrinfo ai_hints;
795 struct addrinfo *ai_list, *ai_ptr;
796 int ai_return;
798 sockent_t *se_head = NULL;
799 sockent_t *se_tail = NULL;
801 DEBUG ("node = %s, service = %s", node, service);
803 memset (&ai_hints, '\0', sizeof (ai_hints));
804 ai_hints.ai_flags = 0;
805 #ifdef AI_PASSIVE
806 ai_hints.ai_flags |= AI_PASSIVE;
807 #endif
808 #ifdef AI_ADDRCONFIG
809 ai_hints.ai_flags |= AI_ADDRCONFIG;
810 #endif
811 ai_hints.ai_family = AF_UNSPEC;
812 ai_hints.ai_socktype = SOCK_DGRAM;
813 ai_hints.ai_protocol = IPPROTO_UDP;
815 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
816 if (ai_return != 0)
817 {
818 char errbuf[1024];
819 ERROR ("getaddrinfo (%s, %s): %s",
820 (node == NULL) ? "(null)" : node,
821 (service == NULL) ? "(null)" : service,
822 (ai_return == EAI_SYSTEM)
823 ? sstrerror (errno, errbuf, sizeof (errbuf))
824 : gai_strerror (ai_return));
825 return (NULL);
826 }
828 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
829 {
830 sockent_t *se;
832 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
833 {
834 char errbuf[1024];
835 ERROR ("malloc: %s",
836 sstrerror (errno, errbuf,
837 sizeof (errbuf)));
838 continue;
839 }
841 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
842 {
843 char errbuf[1024];
844 ERROR ("malloc: %s",
845 sstrerror (errno, errbuf,
846 sizeof (errbuf)));
847 free (se);
848 continue;
849 }
851 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
852 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
853 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
854 se->addrlen = ai_ptr->ai_addrlen;
856 se->fd = socket (ai_ptr->ai_family,
857 ai_ptr->ai_socktype,
858 ai_ptr->ai_protocol);
859 se->next = NULL;
861 if (se->fd == -1)
862 {
863 char errbuf[1024];
864 ERROR ("socket: %s",
865 sstrerror (errno, errbuf,
866 sizeof (errbuf)));
867 free (se->addr);
868 free (se);
869 continue;
870 }
872 if (listen != 0)
873 {
874 if (network_bind_socket (se, ai_ptr) != 0)
875 {
876 close (se->fd);
877 free (se->addr);
878 free (se);
879 continue;
880 }
881 }
882 else /* listen == 0 */
883 {
884 network_set_ttl (se, ai_ptr);
885 }
887 if (se_tail == NULL)
888 {
889 se_head = se;
890 se_tail = se;
891 }
892 else
893 {
894 se_tail->next = se;
895 se_tail = se;
896 }
898 /* We don't open more than one write-socket per node/service pair.. */
899 if (listen == 0)
900 break;
901 }
903 freeaddrinfo (ai_list);
905 return (se_head);
906 } /* sockent_t *network_create_socket */
908 static sockent_t *network_create_default_socket (int listen)
909 {
910 sockent_t *se_ptr = NULL;
911 sockent_t *se_head = NULL;
912 sockent_t *se_tail = NULL;
914 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
915 NET_DEFAULT_PORT, listen);
917 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
918 if ((listen == 0) && (se_ptr != NULL))
919 return (se_ptr);
921 if (se_ptr != NULL)
922 {
923 se_head = se_ptr;
924 se_tail = se_ptr;
925 while (se_tail->next != NULL)
926 se_tail = se_tail->next;
927 }
929 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
931 if (se_tail == NULL)
932 return (se_ptr);
934 se_tail->next = se_ptr;
935 return (se_head);
936 } /* sockent_t *network_create_default_socket */
938 static int network_add_listen_socket (const char *node, const char *service)
939 {
940 sockent_t *se;
941 sockent_t *se_ptr;
942 int se_num = 0;
944 if (service == NULL)
945 service = NET_DEFAULT_PORT;
947 if (node == NULL)
948 se = network_create_default_socket (1 /* listen == true */);
949 else
950 se = network_create_socket (node, service, 1 /* listen == true */);
952 if (se == NULL)
953 return (-1);
955 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
956 se_num++;
958 listen_sockets = (struct pollfd *) realloc (listen_sockets,
959 (listen_sockets_num + se_num)
960 * sizeof (struct pollfd));
962 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
963 {
964 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
965 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
966 listen_sockets[listen_sockets_num].revents = 0;
967 listen_sockets_num++;
968 } /* for (se) */
970 free_sockent (se);
971 return (0);
972 } /* int network_add_listen_socket */
974 static int network_add_sending_socket (const char *node, const char *service)
975 {
976 sockent_t *se;
977 sockent_t *se_ptr;
979 if (service == NULL)
980 service = NET_DEFAULT_PORT;
982 if (node == NULL)
983 se = network_create_default_socket (0 /* listen == false */);
984 else
985 se = network_create_socket (node, service, 0 /* listen == false */);
987 if (se == NULL)
988 return (-1);
990 if (sending_sockets == NULL)
991 {
992 sending_sockets = se;
993 return (0);
994 }
996 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
997 /* seek end */;
999 se_ptr->next = se;
1000 return (0);
1001 } /* int network_get_listen_socket */
1003 static int network_receive (void)
1004 {
1005 char buffer[BUFF_SIZE];
1006 int buffer_len;
1008 int i;
1009 int status;
1011 if (listen_sockets_num == 0)
1012 network_add_listen_socket (NULL, NULL);
1014 if (listen_sockets_num == 0)
1015 {
1016 ERROR ("network: Failed to open a listening socket.");
1017 return (-1);
1018 }
1020 while (listen_loop == 0)
1021 {
1022 status = poll (listen_sockets, listen_sockets_num, -1);
1024 if (status <= 0)
1025 {
1026 char errbuf[1024];
1027 if (errno == EINTR)
1028 continue;
1029 ERROR ("poll failed: %s",
1030 sstrerror (errno, errbuf, sizeof (errbuf)));
1031 return (-1);
1032 }
1034 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1035 {
1036 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1037 continue;
1038 status--;
1040 buffer_len = recv (listen_sockets[i].fd,
1041 buffer, sizeof (buffer),
1042 0 /* no flags */);
1043 if (buffer_len < 0)
1044 {
1045 char errbuf[1024];
1046 ERROR ("recv failed: %s",
1047 sstrerror (errno, errbuf,
1048 sizeof (errbuf)));
1049 return (-1);
1050 }
1052 parse_packet (buffer, buffer_len);
1053 } /* for (listen_sockets) */
1054 } /* while (listen_loop == 0) */
1056 return (0);
1057 }
1059 static void *receive_thread (void *arg)
1060 {
1061 return (network_receive () ? (void *) 1 : (void *) 0);
1062 } /* void *receive_thread */
1064 static void network_send_buffer (const char *buffer, int buffer_len)
1065 {
1066 sockent_t *se;
1067 int status;
1069 DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1071 for (se = sending_sockets; se != NULL; se = se->next)
1072 {
1073 while (42)
1074 {
1075 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1076 (struct sockaddr *) se->addr, se->addrlen);
1077 if (status < 0)
1078 {
1079 char errbuf[1024];
1080 if (errno == EINTR)
1081 continue;
1082 ERROR ("network plugin: sendto failed: %s",
1083 sstrerror (errno, errbuf,
1084 sizeof (errbuf)));
1085 break;
1086 }
1088 break;
1089 } /* while (42) */
1090 } /* for (sending_sockets) */
1091 } /* void network_send_buffer */
1093 static int add_to_buffer (char *buffer, int buffer_size,
1094 value_list_t *vl_def, char *type_def,
1095 const data_set_t *ds, const value_list_t *vl)
1096 {
1097 char *buffer_orig = buffer;
1099 if (strcmp (vl_def->host, vl->host) != 0)
1100 {
1101 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1102 vl->host, strlen (vl->host)) != 0)
1103 return (-1);
1104 strcpy (vl_def->host, vl->host);
1105 }
1107 if (vl_def->time != vl->time)
1108 {
1109 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1110 (uint64_t) vl->time))
1111 return (-1);
1112 vl_def->time = vl->time;
1113 }
1115 if (vl_def->interval != vl->interval)
1116 {
1117 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
1118 (uint64_t) vl->interval))
1119 return (-1);
1120 vl_def->interval = vl->interval;
1121 }
1123 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1124 {
1125 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1126 vl->plugin, strlen (vl->plugin)) != 0)
1127 return (-1);
1128 strcpy (vl_def->plugin, vl->plugin);
1129 }
1131 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1132 {
1133 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1134 vl->plugin_instance,
1135 strlen (vl->plugin_instance)) != 0)
1136 return (-1);
1137 strcpy (vl_def->plugin_instance, vl->plugin_instance);
1138 }
1140 if (strcmp (type_def, ds->type) != 0)
1141 {
1142 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1143 ds->type, strlen (ds->type)) != 0)
1144 return (-1);
1145 strcpy (type_def, ds->type);
1146 }
1148 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1149 {
1150 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1151 vl->type_instance,
1152 strlen (vl->type_instance)) != 0)
1153 return (-1);
1154 strcpy (vl_def->type_instance, vl->type_instance);
1155 }
1157 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1158 return (-1);
1160 return (buffer - buffer_orig);
1161 } /* int add_to_buffer */
1163 static void flush_buffer (void)
1164 {
1165 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1166 send_buffer_fill);
1168 network_send_buffer (send_buffer, send_buffer_fill);
1169 send_buffer_ptr = send_buffer;
1170 send_buffer_fill = 0;
1171 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1172 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1173 }
1175 static int network_write (const data_set_t *ds, const value_list_t *vl)
1176 {
1177 int status;
1179 /* If the value is already in the cache, we have received it via the
1180 * network. We write it again if forwarding is activated. It's then in
1181 * the cache and should we receive it again we will ignore it. */
1182 status = cache_check (ds->type, vl);
1183 if ((network_config_forward == 0)
1184 && (status != 0))
1185 return (0);
1187 pthread_mutex_lock (&send_buffer_lock);
1189 status = add_to_buffer (send_buffer_ptr,
1190 sizeof (send_buffer) - send_buffer_fill,
1191 &send_buffer_vl, send_buffer_type,
1192 ds, vl);
1193 if (status >= 0)
1194 {
1195 /* status == bytes added to the buffer */
1196 send_buffer_fill += status;
1197 send_buffer_ptr += status;
1198 }
1199 else
1200 {
1201 flush_buffer ();
1203 status = add_to_buffer (send_buffer_ptr,
1204 sizeof (send_buffer) - send_buffer_fill,
1205 &send_buffer_vl, send_buffer_type,
1206 ds, vl);
1208 if (status >= 0)
1209 {
1210 send_buffer_fill += status;
1211 send_buffer_ptr += status;
1212 }
1213 }
1215 if (status < 0)
1216 {
1217 ERROR ("network plugin: Unable to append to the "
1218 "buffer for some weird reason");
1219 }
1220 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1221 {
1222 flush_buffer ();
1223 }
1225 pthread_mutex_unlock (&send_buffer_lock);
1227 return ((status < 0) ? -1 : 0);
1228 } /* int network_write */
1230 static int network_config (const char *key, const char *val)
1231 {
1232 char *node;
1233 char *service;
1235 char *fields[3];
1236 int fields_num;
1238 if ((strcasecmp ("Listen", key) == 0)
1239 || (strcasecmp ("Server", key) == 0))
1240 {
1241 char *val_cpy = strdup (val);
1242 if (val_cpy == NULL)
1243 return (1);
1245 service = NET_DEFAULT_PORT;
1246 fields_num = strsplit (val_cpy, fields, 3);
1247 if ((fields_num != 1)
1248 && (fields_num != 2))
1249 return (1);
1250 else if (fields_num == 2)
1251 {
1252 if ((service = strchr (fields[1], '.')) != NULL)
1253 *service = '\0';
1254 service = fields[1];
1255 }
1256 node = fields[0];
1258 if (strcasecmp ("Listen", key) == 0)
1259 network_add_listen_socket (node, service);
1260 else
1261 network_add_sending_socket (node, service);
1262 }
1263 else if (strcasecmp ("TimeToLive", key) == 0)
1264 {
1265 int tmp = atoi (val);
1266 if ((tmp > 0) && (tmp < 256))
1267 network_config_ttl = tmp;
1268 else
1269 return (1);
1270 }
1271 else if (strcasecmp ("Forward", key) == 0)
1272 {
1273 if ((strcasecmp ("true", val) == 0)
1274 || (strcasecmp ("yes", val) == 0)
1275 || (strcasecmp ("on", val) == 0))
1276 network_config_forward = 1;
1277 else
1278 network_config_forward = 0;
1279 }
1280 else if (strcasecmp ("CacheFlush", key) == 0)
1281 {
1282 int tmp = atoi (val);
1283 if (tmp > 0)
1284 cache_flush_interval = tmp;
1285 else return (1);
1286 }
1287 else
1288 {
1289 return (-1);
1290 }
1291 return (0);
1292 } /* int network_config */
1294 static int network_shutdown (void)
1295 {
1296 listen_loop++;
1298 if (listen_thread != (pthread_t) 0)
1299 {
1300 pthread_kill (listen_thread, SIGTERM);
1301 pthread_join (listen_thread, NULL /* no return value */);
1302 listen_thread = (pthread_t) 0;
1303 }
1305 if (send_buffer_fill > 0)
1306 flush_buffer ();
1308 if (cache_tree != NULL)
1309 {
1310 void *key;
1311 void *value;
1313 while (c_avl_pick (cache_tree, &key, &value) == 0)
1314 {
1315 sfree (key);
1316 sfree (value);
1317 }
1318 c_avl_destroy (cache_tree);
1319 cache_tree = NULL;
1320 }
1322 /* TODO: Close `sending_sockets' */
1324 plugin_unregister_config ("network");
1325 plugin_unregister_init ("network");
1326 plugin_unregister_write ("network");
1327 plugin_unregister_shutdown ("network");
1329 return (0);
1330 } /* int network_shutdown */
1332 static int network_init (void)
1333 {
1334 plugin_register_shutdown ("network", network_shutdown);
1336 send_buffer_ptr = send_buffer;
1337 send_buffer_fill = 0;
1338 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1339 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1341 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1342 cache_flush_last = time (NULL);
1344 /* setup socket(s) and so on */
1345 if (sending_sockets != NULL)
1346 plugin_register_write ("network", network_write);
1348 if ((listen_sockets_num != 0) && (listen_thread == 0))
1349 {
1350 int status;
1352 status = pthread_create (&listen_thread, NULL /* no attributes */,
1353 receive_thread, NULL /* no argument */);
1355 if (status != 0)
1356 {
1357 char errbuf[1024];
1358 ERROR ("network: pthread_create failed: %s",
1359 sstrerror (errno, errbuf,
1360 sizeof (errbuf)));
1361 }
1362 }
1363 return (0);
1364 } /* int network_init */
1366 void module_register (void)
1367 {
1368 plugin_register_config ("network", network_config,
1369 config_keys, config_keys_num);
1370 plugin_register_init ("network", network_init);
1371 } /* void module_register */