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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) && (buffer_len > sizeof (part_header_t)))
517 {
518 header = (part_header_t *) buffer;
520 if (ntohs (header->length) > buffer_len)
521 break;
522 /* Assure that this loop terminates eventually */
523 if (ntohs (header->length) < 4)
524 break;
526 if (ntohs (header->type) == TYPE_VALUES)
527 {
528 status = parse_part_values (&buffer, &buffer_len,
529 &vl.values, &vl.values_len);
531 if (status != 0)
532 {
533 DEBUG ("parse_part_values failed.");
534 break;
535 }
537 if ((vl.time > 0)
538 && (strlen (vl.host) > 0)
539 && (strlen (vl.plugin) > 0)
540 && (strlen (type) > 0)
541 && (cache_check (type, &vl) == 0))
542 {
543 DEBUG ("network plugin: parse_packet:"
544 " dispatching values");
545 plugin_dispatch_values (type, &vl);
546 }
547 else
548 {
549 DEBUG ("network plugin: parse_packet:"
550 " NOT dispatching values");
551 }
552 }
553 else if (ntohs (header->type) == TYPE_TIME)
554 {
555 uint64_t tmp = 0;
556 status = parse_part_number (&buffer, &buffer_len, &tmp);
557 if (status == 0)
558 vl.time = (time_t) tmp;
559 }
560 else if (ntohs (header->type) == TYPE_INTERVAL)
561 {
562 uint64_t tmp = 0;
563 status = parse_part_number (&buffer, &buffer_len, &tmp);
564 if (status == 0)
565 vl.interval = (int) tmp;
566 }
567 else if (ntohs (header->type) == TYPE_HOST)
568 {
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);
572 }
573 else if (ntohs (header->type) == TYPE_PLUGIN)
574 {
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);
578 }
579 else if (ntohs (header->type) == TYPE_PLUGIN_INSTANCE)
580 {
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);
584 }
585 else if (ntohs (header->type) == TYPE_TYPE)
586 {
587 status = parse_part_string (&buffer, &buffer_len,
588 type, sizeof (type));
589 DEBUG ("network plugin: parse_packet: type = %s", type);
590 }
591 else if (ntohs (header->type) == TYPE_TYPE_INSTANCE)
592 {
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);
596 }
597 else
598 {
599 DEBUG ("network plugin: parse_packet: Unknown part"
600 " type: 0x%0hx", ntohs (header->type));
601 buffer = ((char *) buffer) + ntohs (header->length);
602 }
603 } /* while (buffer_len > sizeof (part_header_t)) */
605 return (0);
606 } /* int parse_packet */
608 static void free_sockent (sockent_t *se)
609 {
610 sockent_t *next;
611 while (se != NULL)
612 {
613 next = se->next;
614 free (se->addr);
615 free (se);
616 se = next;
617 }
618 } /* void free_sockent */
620 /*
621 * int network_set_ttl
622 *
623 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
624 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
625 *
626 * The `struct addrinfo' is used to destinguish between unicast and multicast
627 * sockets.
628 */
629 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
630 {
631 if ((network_config_ttl < 1) || (network_config_ttl > 255))
632 return (-1);
634 DEBUG ("ttl = %i", network_config_ttl);
636 if (ai->ai_family == AF_INET)
637 {
638 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
639 int optname;
641 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
642 optname = IP_MULTICAST_TTL;
643 else
644 optname = IP_TTL;
646 if (setsockopt (se->fd, IPPROTO_IP, optname,
647 &network_config_ttl,
648 sizeof (network_config_ttl)) == -1)
649 {
650 char errbuf[1024];
651 ERROR ("setsockopt: %s",
652 sstrerror (errno, errbuf, sizeof (errbuf)));
653 return (-1);
654 }
655 }
656 else if (ai->ai_family == AF_INET6)
657 {
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;
660 int optname;
662 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
663 optname = IPV6_MULTICAST_HOPS;
664 else
665 optname = IPV6_UNICAST_HOPS;
667 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
668 &network_config_ttl,
669 sizeof (network_config_ttl)) == -1)
670 {
671 char errbuf[1024];
672 ERROR ("setsockopt: %s",
673 sstrerror (errno, errbuf,
674 sizeof (errbuf)));
675 return (-1);
676 }
677 }
679 return (0);
680 } /* int network_set_ttl */
682 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
683 {
684 int loop = 0;
685 int yes = 1;
687 /* allow multiple sockets to use the same PORT number */
688 if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR,
689 &yes, sizeof(yes)) == -1) {
690 char errbuf[1024];
691 ERROR ("setsockopt: %s",
692 sstrerror (errno, errbuf, sizeof (errbuf)));
693 return (-1);
694 }
696 DEBUG ("fd = %i; calling `bind'", se->fd);
698 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
699 {
700 char errbuf[1024];
701 ERROR ("bind: %s",
702 sstrerror (errno, errbuf, sizeof (errbuf)));
703 return (-1);
704 }
706 if (ai->ai_family == AF_INET)
707 {
708 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
709 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
710 {
711 struct ip_mreq mreq;
713 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
715 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
716 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
718 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
719 &loop, sizeof (loop)) == -1)
720 {
721 char errbuf[1024];
722 ERROR ("setsockopt: %s",
723 sstrerror (errno, errbuf,
724 sizeof (errbuf)));
725 return (-1);
726 }
728 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
729 &mreq, sizeof (mreq)) == -1)
730 {
731 char errbuf[1024];
732 ERROR ("setsockopt: %s",
733 sstrerror (errno, errbuf,
734 sizeof (errbuf)));
735 return (-1);
736 }
737 }
738 }
739 else if (ai->ai_family == AF_INET6)
740 {
741 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
742 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
743 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
744 {
745 struct ipv6_mreq mreq;
747 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
749 memcpy (&mreq.ipv6mr_multiaddr,
750 &addr->sin6_addr,
751 sizeof (addr->sin6_addr));
753 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
754 * ipv6mr_interface may be set to zeroes to
755 * choose the default multicast interface or to
756 * the index of a particular multicast-capable
757 * interface if the host is multihomed.
758 * Membership is associ-associated with a
759 * single interface; programs running on
760 * multihomed hosts may need to join the same
761 * group on more than one interface.*/
762 mreq.ipv6mr_interface = 0;
764 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
765 &loop, sizeof (loop)) == -1)
766 {
767 char errbuf[1024];
768 ERROR ("setsockopt: %s",
769 sstrerror (errno, errbuf,
770 sizeof (errbuf)));
771 return (-1);
772 }
774 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
775 &mreq, sizeof (mreq)) == -1)
776 {
777 char errbuf[1024];
778 ERROR ("setsockopt: %s",
779 sstrerror (errno, errbuf,
780 sizeof (errbuf)));
781 return (-1);
782 }
783 }
784 }
786 return (0);
787 } /* int network_bind_socket */
789 static sockent_t *network_create_socket (const char *node,
790 const char *service,
791 int listen)
792 {
793 struct addrinfo ai_hints;
794 struct addrinfo *ai_list, *ai_ptr;
795 int ai_return;
797 sockent_t *se_head = NULL;
798 sockent_t *se_tail = NULL;
800 DEBUG ("node = %s, service = %s", node, service);
802 memset (&ai_hints, '\0', sizeof (ai_hints));
803 ai_hints.ai_flags = 0;
804 #ifdef AI_PASSIVE
805 ai_hints.ai_flags |= AI_PASSIVE;
806 #endif
807 #ifdef AI_ADDRCONFIG
808 ai_hints.ai_flags |= AI_ADDRCONFIG;
809 #endif
810 ai_hints.ai_family = AF_UNSPEC;
811 ai_hints.ai_socktype = SOCK_DGRAM;
812 ai_hints.ai_protocol = IPPROTO_UDP;
814 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
815 if (ai_return != 0)
816 {
817 char errbuf[1024];
818 ERROR ("getaddrinfo (%s, %s): %s",
819 (node == NULL) ? "(null)" : node,
820 (service == NULL) ? "(null)" : service,
821 (ai_return == EAI_SYSTEM)
822 ? sstrerror (errno, errbuf, sizeof (errbuf))
823 : gai_strerror (ai_return));
824 return (NULL);
825 }
827 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
828 {
829 sockent_t *se;
831 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
832 {
833 char errbuf[1024];
834 ERROR ("malloc: %s",
835 sstrerror (errno, errbuf,
836 sizeof (errbuf)));
837 continue;
838 }
840 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
841 {
842 char errbuf[1024];
843 ERROR ("malloc: %s",
844 sstrerror (errno, errbuf,
845 sizeof (errbuf)));
846 free (se);
847 continue;
848 }
850 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
851 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
852 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
853 se->addrlen = ai_ptr->ai_addrlen;
855 se->fd = socket (ai_ptr->ai_family,
856 ai_ptr->ai_socktype,
857 ai_ptr->ai_protocol);
858 se->next = NULL;
860 if (se->fd == -1)
861 {
862 char errbuf[1024];
863 ERROR ("socket: %s",
864 sstrerror (errno, errbuf,
865 sizeof (errbuf)));
866 free (se->addr);
867 free (se);
868 continue;
869 }
871 if (listen != 0)
872 {
873 if (network_bind_socket (se, ai_ptr) != 0)
874 {
875 close (se->fd);
876 free (se->addr);
877 free (se);
878 continue;
879 }
880 }
881 else /* listen == 0 */
882 {
883 network_set_ttl (se, ai_ptr);
884 }
886 if (se_tail == NULL)
887 {
888 se_head = se;
889 se_tail = se;
890 }
891 else
892 {
893 se_tail->next = se;
894 se_tail = se;
895 }
897 /* We don't open more than one write-socket per node/service pair.. */
898 if (listen == 0)
899 break;
900 }
902 freeaddrinfo (ai_list);
904 return (se_head);
905 } /* sockent_t *network_create_socket */
907 static sockent_t *network_create_default_socket (int listen)
908 {
909 sockent_t *se_ptr = NULL;
910 sockent_t *se_head = NULL;
911 sockent_t *se_tail = NULL;
913 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
914 NET_DEFAULT_PORT, listen);
916 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
917 if ((listen == 0) && (se_ptr != NULL))
918 return (se_ptr);
920 if (se_ptr != NULL)
921 {
922 se_head = se_ptr;
923 se_tail = se_ptr;
924 while (se_tail->next != NULL)
925 se_tail = se_tail->next;
926 }
928 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
930 if (se_tail == NULL)
931 return (se_ptr);
933 se_tail->next = se_ptr;
934 return (se_head);
935 } /* sockent_t *network_create_default_socket */
937 static int network_add_listen_socket (const char *node, const char *service)
938 {
939 sockent_t *se;
940 sockent_t *se_ptr;
941 int se_num = 0;
943 if (service == NULL)
944 service = NET_DEFAULT_PORT;
946 if (node == NULL)
947 se = network_create_default_socket (1 /* listen == true */);
948 else
949 se = network_create_socket (node, service, 1 /* listen == true */);
951 if (se == NULL)
952 return (-1);
954 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
955 se_num++;
957 listen_sockets = (struct pollfd *) realloc (listen_sockets,
958 (listen_sockets_num + se_num)
959 * sizeof (struct pollfd));
961 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
962 {
963 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
964 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
965 listen_sockets[listen_sockets_num].revents = 0;
966 listen_sockets_num++;
967 } /* for (se) */
969 free_sockent (se);
970 return (0);
971 } /* int network_add_listen_socket */
973 static int network_add_sending_socket (const char *node, const char *service)
974 {
975 sockent_t *se;
976 sockent_t *se_ptr;
978 if (service == NULL)
979 service = NET_DEFAULT_PORT;
981 if (node == NULL)
982 se = network_create_default_socket (0 /* listen == false */);
983 else
984 se = network_create_socket (node, service, 0 /* listen == false */);
986 if (se == NULL)
987 return (-1);
989 if (sending_sockets == NULL)
990 {
991 sending_sockets = se;
992 return (0);
993 }
995 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
996 /* seek end */;
998 se_ptr->next = se;
999 return (0);
1000 } /* int network_get_listen_socket */
1002 static int network_receive (void)
1003 {
1004 char buffer[BUFF_SIZE];
1005 int buffer_len;
1007 int i;
1008 int status;
1010 if (listen_sockets_num == 0)
1011 network_add_listen_socket (NULL, NULL);
1013 if (listen_sockets_num == 0)
1014 {
1015 ERROR ("network: Failed to open a listening socket.");
1016 return (-1);
1017 }
1019 while (listen_loop == 0)
1020 {
1021 status = poll (listen_sockets, listen_sockets_num, -1);
1023 if (status <= 0)
1024 {
1025 char errbuf[1024];
1026 if (errno == EINTR)
1027 continue;
1028 ERROR ("poll failed: %s",
1029 sstrerror (errno, errbuf, sizeof (errbuf)));
1030 return (-1);
1031 }
1033 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1034 {
1035 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1036 continue;
1037 status--;
1039 buffer_len = recv (listen_sockets[i].fd,
1040 buffer, sizeof (buffer),
1041 0 /* no flags */);
1042 if (buffer_len < 0)
1043 {
1044 char errbuf[1024];
1045 ERROR ("recv failed: %s",
1046 sstrerror (errno, errbuf,
1047 sizeof (errbuf)));
1048 return (-1);
1049 }
1051 parse_packet (buffer, buffer_len);
1052 } /* for (listen_sockets) */
1053 } /* while (listen_loop == 0) */
1055 return (0);
1056 }
1058 static void *receive_thread (void *arg)
1059 {
1060 return (network_receive () ? (void *) 1 : (void *) 0);
1061 } /* void *receive_thread */
1063 static void network_send_buffer (const char *buffer, int buffer_len)
1064 {
1065 sockent_t *se;
1066 int status;
1068 DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1070 for (se = sending_sockets; se != NULL; se = se->next)
1071 {
1072 while (42)
1073 {
1074 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1075 (struct sockaddr *) se->addr, se->addrlen);
1076 if (status < 0)
1077 {
1078 char errbuf[1024];
1079 if (errno == EINTR)
1080 continue;
1081 ERROR ("network plugin: sendto failed: %s",
1082 sstrerror (errno, errbuf,
1083 sizeof (errbuf)));
1084 break;
1085 }
1087 break;
1088 } /* while (42) */
1089 } /* for (sending_sockets) */
1090 } /* void network_send_buffer */
1092 static int add_to_buffer (char *buffer, int buffer_size,
1093 value_list_t *vl_def, char *type_def,
1094 const data_set_t *ds, const value_list_t *vl)
1095 {
1096 char *buffer_orig = buffer;
1098 if (strcmp (vl_def->host, vl->host) != 0)
1099 {
1100 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1101 vl->host, strlen (vl->host)) != 0)
1102 return (-1);
1103 strcpy (vl_def->host, vl->host);
1104 }
1106 if (vl_def->time != vl->time)
1107 {
1108 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1109 (uint64_t) vl->time))
1110 return (-1);
1111 vl_def->time = vl->time;
1112 }
1114 if (vl_def->interval != vl->interval)
1115 {
1116 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
1117 (uint64_t) vl->interval))
1118 return (-1);
1119 vl_def->interval = vl->interval;
1120 }
1122 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1123 {
1124 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1125 vl->plugin, strlen (vl->plugin)) != 0)
1126 return (-1);
1127 strcpy (vl_def->plugin, vl->plugin);
1128 }
1130 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1131 {
1132 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1133 vl->plugin_instance,
1134 strlen (vl->plugin_instance)) != 0)
1135 return (-1);
1136 strcpy (vl_def->plugin_instance, vl->plugin_instance);
1137 }
1139 if (strcmp (type_def, ds->type) != 0)
1140 {
1141 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1142 ds->type, strlen (ds->type)) != 0)
1143 return (-1);
1144 strcpy (type_def, ds->type);
1145 }
1147 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1148 {
1149 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1150 vl->type_instance,
1151 strlen (vl->type_instance)) != 0)
1152 return (-1);
1153 strcpy (vl_def->type_instance, vl->type_instance);
1154 }
1156 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1157 return (-1);
1159 return (buffer - buffer_orig);
1160 } /* int add_to_buffer */
1162 static void flush_buffer (void)
1163 {
1164 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1165 send_buffer_fill);
1167 network_send_buffer (send_buffer, send_buffer_fill);
1168 send_buffer_ptr = send_buffer;
1169 send_buffer_fill = 0;
1170 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1171 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1172 }
1174 static int network_write (const data_set_t *ds, const value_list_t *vl)
1175 {
1176 int status;
1178 /* If the value is already in the cache, we have received it via the
1179 * network. We write it again if forwarding is activated. It's then in
1180 * the cache and should we receive it again we will ignore it. */
1181 status = cache_check (ds->type, vl);
1182 if ((network_config_forward == 0)
1183 && (status != 0))
1184 return (0);
1186 pthread_mutex_lock (&send_buffer_lock);
1188 status = add_to_buffer (send_buffer_ptr,
1189 sizeof (send_buffer) - send_buffer_fill,
1190 &send_buffer_vl, send_buffer_type,
1191 ds, vl);
1192 if (status >= 0)
1193 {
1194 /* status == bytes added to the buffer */
1195 send_buffer_fill += status;
1196 send_buffer_ptr += status;
1197 }
1198 else
1199 {
1200 flush_buffer ();
1202 status = add_to_buffer (send_buffer_ptr,
1203 sizeof (send_buffer) - send_buffer_fill,
1204 &send_buffer_vl, send_buffer_type,
1205 ds, vl);
1207 if (status >= 0)
1208 {
1209 send_buffer_fill += status;
1210 send_buffer_ptr += status;
1211 }
1212 }
1214 if (status < 0)
1215 {
1216 ERROR ("network plugin: Unable to append to the "
1217 "buffer for some weird reason");
1218 }
1219 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1220 {
1221 flush_buffer ();
1222 }
1224 pthread_mutex_unlock (&send_buffer_lock);
1226 return ((status < 0) ? -1 : 0);
1227 } /* int network_write */
1229 static int network_config (const char *key, const char *val)
1230 {
1231 char *node;
1232 char *service;
1234 char *fields[3];
1235 int fields_num;
1237 if ((strcasecmp ("Listen", key) == 0)
1238 || (strcasecmp ("Server", key) == 0))
1239 {
1240 char *val_cpy = strdup (val);
1241 if (val_cpy == NULL)
1242 return (1);
1244 service = NET_DEFAULT_PORT;
1245 fields_num = strsplit (val_cpy, fields, 3);
1246 if ((fields_num != 1)
1247 && (fields_num != 2))
1248 return (1);
1249 else if (fields_num == 2)
1250 {
1251 if ((service = strchr (fields[1], '.')) != NULL)
1252 *service = '\0';
1253 service = fields[1];
1254 }
1255 node = fields[0];
1257 if (strcasecmp ("Listen", key) == 0)
1258 network_add_listen_socket (node, service);
1259 else
1260 network_add_sending_socket (node, service);
1261 }
1262 else if (strcasecmp ("TimeToLive", key) == 0)
1263 {
1264 int tmp = atoi (val);
1265 if ((tmp > 0) && (tmp < 256))
1266 network_config_ttl = tmp;
1267 else
1268 return (1);
1269 }
1270 else if (strcasecmp ("Forward", key) == 0)
1271 {
1272 if ((strcasecmp ("true", val) == 0)
1273 || (strcasecmp ("yes", val) == 0)
1274 || (strcasecmp ("on", val) == 0))
1275 network_config_forward = 1;
1276 else
1277 network_config_forward = 0;
1278 }
1279 else if (strcasecmp ("CacheFlush", key) == 0)
1280 {
1281 int tmp = atoi (val);
1282 if (tmp > 0)
1283 cache_flush_interval = tmp;
1284 else return (1);
1285 }
1286 else
1287 {
1288 return (-1);
1289 }
1290 return (0);
1291 } /* int network_config */
1293 static int network_shutdown (void)
1294 {
1295 listen_loop++;
1297 if (listen_thread != (pthread_t) 0)
1298 {
1299 pthread_kill (listen_thread, SIGTERM);
1300 pthread_join (listen_thread, NULL /* no return value */);
1301 listen_thread = (pthread_t) 0;
1302 }
1304 if (send_buffer_fill > 0)
1305 flush_buffer ();
1307 if (cache_tree != NULL)
1308 {
1309 void *key;
1310 void *value;
1312 while (c_avl_pick (cache_tree, &key, &value) == 0)
1313 {
1314 sfree (key);
1315 sfree (value);
1316 }
1317 c_avl_destroy (cache_tree);
1318 cache_tree = NULL;
1319 }
1321 /* TODO: Close `sending_sockets' */
1323 plugin_unregister_config ("network");
1324 plugin_unregister_init ("network");
1325 plugin_unregister_write ("network");
1326 plugin_unregister_shutdown ("network");
1328 return (0);
1329 } /* int network_shutdown */
1331 static int network_init (void)
1332 {
1333 plugin_register_shutdown ("network", network_shutdown);
1335 send_buffer_ptr = send_buffer;
1336 send_buffer_fill = 0;
1337 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1338 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1340 cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1341 cache_flush_last = time (NULL);
1343 /* setup socket(s) and so on */
1344 if (sending_sockets != NULL)
1345 plugin_register_write ("network", network_write);
1347 if ((listen_sockets_num != 0) && (listen_thread == 0))
1348 {
1349 int status;
1351 status = pthread_create (&listen_thread, NULL /* no attributes */,
1352 receive_thread, NULL /* no argument */);
1354 if (status != 0)
1355 {
1356 char errbuf[1024];
1357 ERROR ("network: pthread_create failed: %s",
1358 sstrerror (errno, errbuf,
1359 sizeof (errbuf)));
1360 }
1361 }
1362 return (0);
1363 } /* int network_init */
1365 void module_register (void)
1366 {
1367 plugin_register_config ("network", network_config,
1368 config_keys, config_keys_num);
1369 plugin_register_init ("network", network_init);
1370 } /* void module_register */