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_INIT;
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;
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 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)
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 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 (avl_iterator_next) */
210 avl_iterator_destroy (iter);
212 for (i = 0; i < keys_num; i++)
213 {
214 if (avl_remove (cache_tree, keys[i], (void *) &key,
215 (void *) &value) != 0)
216 {
217 WARNING ("network plugin: cache_flush: 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 (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 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_HOST)
561 {
562 status = parse_part_string (&buffer, &buffer_len,
563 vl.host, sizeof (vl.host));
564 DEBUG ("network plugin: parse_packet: vl.host = %s", vl.host);
565 }
566 else if (ntohs (header->type) == TYPE_PLUGIN)
567 {
568 status = parse_part_string (&buffer, &buffer_len,
569 vl.plugin, sizeof (vl.plugin));
570 DEBUG ("network plugin: parse_packet: vl.plugin = %s", vl.plugin);
571 }
572 else if (ntohs (header->type) == TYPE_PLUGIN_INSTANCE)
573 {
574 status = parse_part_string (&buffer, &buffer_len,
575 vl.plugin_instance, sizeof (vl.plugin_instance));
576 DEBUG ("network plugin: parse_packet: vl.plugin_instance = %s", vl.plugin_instance);
577 }
578 else if (ntohs (header->type) == TYPE_TYPE)
579 {
580 status = parse_part_string (&buffer, &buffer_len,
581 type, sizeof (type));
582 DEBUG ("network plugin: parse_packet: type = %s", type);
583 }
584 else if (ntohs (header->type) == TYPE_TYPE_INSTANCE)
585 {
586 status = parse_part_string (&buffer, &buffer_len,
587 vl.type_instance, sizeof (vl.type_instance));
588 DEBUG ("network plugin: parse_packet: vl.type_instance = %s", vl.type_instance);
589 }
590 else
591 {
592 DEBUG ("network plugin: parse_packet: Unknown part"
593 " type: 0x%0hx", ntohs (header->type));
594 buffer = ((char *) buffer) + ntohs (header->length);
595 }
596 } /* while (buffer_len > sizeof (part_header_t)) */
598 return (0);
599 } /* int parse_packet */
601 static void free_sockent (sockent_t *se)
602 {
603 sockent_t *next;
604 while (se != NULL)
605 {
606 next = se->next;
607 free (se->addr);
608 free (se);
609 se = next;
610 }
611 } /* void free_sockent */
613 /*
614 * int network_set_ttl
615 *
616 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
617 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
618 *
619 * The `struct addrinfo' is used to destinguish between unicast and multicast
620 * sockets.
621 */
622 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
623 {
624 if ((network_config_ttl < 1) || (network_config_ttl > 255))
625 return (-1);
627 DEBUG ("ttl = %i", network_config_ttl);
629 if (ai->ai_family == AF_INET)
630 {
631 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
632 int optname;
634 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
635 optname = IP_MULTICAST_TTL;
636 else
637 optname = IP_TTL;
639 if (setsockopt (se->fd, IPPROTO_IP, optname,
640 &network_config_ttl,
641 sizeof (network_config_ttl)) == -1)
642 {
643 char errbuf[1024];
644 ERROR ("setsockopt: %s",
645 sstrerror (errno, errbuf, sizeof (errbuf)));
646 return (-1);
647 }
648 }
649 else if (ai->ai_family == AF_INET6)
650 {
651 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
652 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
653 int optname;
655 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
656 optname = IPV6_MULTICAST_HOPS;
657 else
658 optname = IPV6_UNICAST_HOPS;
660 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
661 &network_config_ttl,
662 sizeof (network_config_ttl)) == -1)
663 {
664 char errbuf[1024];
665 ERROR ("setsockopt: %s",
666 sstrerror (errno, errbuf,
667 sizeof (errbuf)));
668 return (-1);
669 }
670 }
672 return (0);
673 } /* int network_set_ttl */
675 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
676 {
677 int loop = 0;
679 DEBUG ("fd = %i; calling `bind'", se->fd);
681 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
682 {
683 char errbuf[1024];
684 ERROR ("bind: %s",
685 sstrerror (errno, errbuf, sizeof (errbuf)));
686 return (-1);
687 }
689 if (ai->ai_family == AF_INET)
690 {
691 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
692 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
693 {
694 struct ip_mreq mreq;
696 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
698 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
699 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
701 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
702 &loop, sizeof (loop)) == -1)
703 {
704 char errbuf[1024];
705 ERROR ("setsockopt: %s",
706 sstrerror (errno, errbuf,
707 sizeof (errbuf)));
708 return (-1);
709 }
711 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
712 &mreq, sizeof (mreq)) == -1)
713 {
714 char errbuf[1024];
715 ERROR ("setsockopt: %s",
716 sstrerror (errno, errbuf,
717 sizeof (errbuf)));
718 return (-1);
719 }
720 }
721 }
722 else if (ai->ai_family == AF_INET6)
723 {
724 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
725 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
726 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
727 {
728 struct ipv6_mreq mreq;
730 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
732 memcpy (&mreq.ipv6mr_multiaddr,
733 &addr->sin6_addr,
734 sizeof (addr->sin6_addr));
736 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
737 * ipv6mr_interface may be set to zeroes to
738 * choose the default multicast interface or to
739 * the index of a particular multicast-capable
740 * interface if the host is multihomed.
741 * Membership is associ-associated with a
742 * single interface; programs running on
743 * multihomed hosts may need to join the same
744 * group on more than one interface.*/
745 mreq.ipv6mr_interface = 0;
747 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
748 &loop, sizeof (loop)) == -1)
749 {
750 char errbuf[1024];
751 ERROR ("setsockopt: %s",
752 sstrerror (errno, errbuf,
753 sizeof (errbuf)));
754 return (-1);
755 }
757 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
758 &mreq, sizeof (mreq)) == -1)
759 {
760 char errbuf[1024];
761 ERROR ("setsockopt: %s",
762 sstrerror (errno, errbuf,
763 sizeof (errbuf)));
764 return (-1);
765 }
766 }
767 }
769 return (0);
770 } /* int network_bind_socket */
772 static sockent_t *network_create_socket (const char *node,
773 const char *service,
774 int listen)
775 {
776 struct addrinfo ai_hints;
777 struct addrinfo *ai_list, *ai_ptr;
778 int ai_return;
780 sockent_t *se_head = NULL;
781 sockent_t *se_tail = NULL;
783 DEBUG ("node = %s, service = %s", node, service);
785 memset (&ai_hints, '\0', sizeof (ai_hints));
786 ai_hints.ai_flags = 0;
787 #ifdef AI_PASSIVE
788 ai_hints.ai_flags |= AI_PASSIVE;
789 #endif
790 #ifdef AI_ADDRCONFIG
791 ai_hints.ai_flags |= AI_ADDRCONFIG;
792 #endif
793 ai_hints.ai_family = AF_UNSPEC;
794 ai_hints.ai_socktype = SOCK_DGRAM;
795 ai_hints.ai_protocol = IPPROTO_UDP;
797 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
798 if (ai_return != 0)
799 {
800 char errbuf[1024];
801 ERROR ("getaddrinfo (%s, %s): %s",
802 (node == NULL) ? "(null)" : node,
803 (service == NULL) ? "(null)" : service,
804 (ai_return == EAI_SYSTEM)
805 ? sstrerror (errno, errbuf, sizeof (errbuf))
806 : gai_strerror (ai_return));
807 return (NULL);
808 }
810 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
811 {
812 sockent_t *se;
814 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
815 {
816 char errbuf[1024];
817 ERROR ("malloc: %s",
818 sstrerror (errno, errbuf,
819 sizeof (errbuf)));
820 continue;
821 }
823 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
824 {
825 char errbuf[1024];
826 ERROR ("malloc: %s",
827 sstrerror (errno, errbuf,
828 sizeof (errbuf)));
829 free (se);
830 continue;
831 }
833 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
834 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
835 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
836 se->addrlen = ai_ptr->ai_addrlen;
838 se->fd = socket (ai_ptr->ai_family,
839 ai_ptr->ai_socktype,
840 ai_ptr->ai_protocol);
841 se->next = NULL;
843 if (se->fd == -1)
844 {
845 char errbuf[1024];
846 ERROR ("socket: %s",
847 sstrerror (errno, errbuf,
848 sizeof (errbuf)));
849 free (se->addr);
850 free (se);
851 continue;
852 }
854 if (listen != 0)
855 {
856 if (network_bind_socket (se, ai_ptr) != 0)
857 {
858 close (se->fd);
859 free (se->addr);
860 free (se);
861 continue;
862 }
863 }
864 else /* listen == 0 */
865 {
866 network_set_ttl (se, ai_ptr);
867 }
869 if (se_tail == NULL)
870 {
871 se_head = se;
872 se_tail = se;
873 }
874 else
875 {
876 se_tail->next = se;
877 se_tail = se;
878 }
880 /* We don't open more than one write-socket per node/service pair.. */
881 if (listen == 0)
882 break;
883 }
885 freeaddrinfo (ai_list);
887 return (se_head);
888 } /* sockent_t *network_create_socket */
890 static sockent_t *network_create_default_socket (int listen)
891 {
892 sockent_t *se_ptr = NULL;
893 sockent_t *se_head = NULL;
894 sockent_t *se_tail = NULL;
896 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
897 NET_DEFAULT_PORT, listen);
899 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
900 if ((listen == 0) && (se_ptr != NULL))
901 return (se_ptr);
903 if (se_ptr != NULL)
904 {
905 se_head = se_ptr;
906 se_tail = se_ptr;
907 while (se_tail->next != NULL)
908 se_tail = se_tail->next;
909 }
911 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
913 if (se_tail == NULL)
914 return (se_ptr);
916 se_tail->next = se_ptr;
917 return (se_head);
918 } /* sockent_t *network_create_default_socket */
920 static int network_add_listen_socket (const char *node, const char *service)
921 {
922 sockent_t *se;
923 sockent_t *se_ptr;
924 int se_num = 0;
926 if (service == NULL)
927 service = NET_DEFAULT_PORT;
929 if (node == NULL)
930 se = network_create_default_socket (1 /* listen == true */);
931 else
932 se = network_create_socket (node, service, 1 /* listen == true */);
934 if (se == NULL)
935 return (-1);
937 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
938 se_num++;
940 listen_sockets = (struct pollfd *) realloc (listen_sockets,
941 (listen_sockets_num + se_num)
942 * sizeof (struct pollfd));
944 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
945 {
946 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
947 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
948 listen_sockets[listen_sockets_num].revents = 0;
949 listen_sockets_num++;
950 } /* for (se) */
952 free_sockent (se);
953 return (0);
954 } /* int network_add_listen_socket */
956 static int network_add_sending_socket (const char *node, const char *service)
957 {
958 sockent_t *se;
959 sockent_t *se_ptr;
961 if (service == NULL)
962 service = NET_DEFAULT_PORT;
964 if (node == NULL)
965 se = network_create_default_socket (0 /* listen == false */);
966 else
967 se = network_create_socket (node, service, 0 /* listen == false */);
969 if (se == NULL)
970 return (-1);
972 if (sending_sockets == NULL)
973 {
974 sending_sockets = se;
975 return (0);
976 }
978 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
979 /* seek end */;
981 se_ptr->next = se;
982 return (0);
983 } /* int network_get_listen_socket */
985 int network_receive (void)
986 {
987 char buffer[BUFF_SIZE];
988 int buffer_len;
990 int i;
991 int status;
993 if (listen_sockets_num == 0)
994 network_add_listen_socket (NULL, NULL);
996 if (listen_sockets_num == 0)
997 {
998 ERROR ("network: Failed to open a listening socket.");
999 return (-1);
1000 }
1002 while (listen_loop == 0)
1003 {
1004 status = poll (listen_sockets, listen_sockets_num, -1);
1006 if (status <= 0)
1007 {
1008 char errbuf[1024];
1009 if (errno == EINTR)
1010 continue;
1011 ERROR ("poll failed: %s",
1012 sstrerror (errno, errbuf, sizeof (errbuf)));
1013 return (-1);
1014 }
1016 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1017 {
1018 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1019 continue;
1020 status--;
1022 buffer_len = recv (listen_sockets[i].fd,
1023 buffer, sizeof (buffer),
1024 0 /* no flags */);
1025 if (buffer_len < 0)
1026 {
1027 char errbuf[1024];
1028 ERROR ("recv failed: %s",
1029 sstrerror (errno, errbuf,
1030 sizeof (errbuf)));
1031 return (-1);
1032 }
1034 parse_packet (buffer, buffer_len);
1035 } /* for (listen_sockets) */
1036 } /* while (listen_loop == 0) */
1038 return (0);
1039 }
1041 static void *receive_thread (void *arg)
1042 {
1043 return (network_receive () ? (void *) 1 : (void *) 0);
1044 } /* void *receive_thread */
1046 static void network_send_buffer (const char *buffer, int buffer_len)
1047 {
1048 sockent_t *se;
1049 int status;
1051 DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1053 for (se = sending_sockets; se != NULL; se = se->next)
1054 {
1055 while (42)
1056 {
1057 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1058 (struct sockaddr *) se->addr, se->addrlen);
1059 if (status < 0)
1060 {
1061 char errbuf[1024];
1062 if (errno == EINTR)
1063 continue;
1064 ERROR ("network plugin: sendto failed: %s",
1065 sstrerror (errno, errbuf,
1066 sizeof (errbuf)));
1067 break;
1068 }
1070 break;
1071 } /* while (42) */
1072 } /* for (sending_sockets) */
1073 } /* void network_send_buffer */
1075 static int add_to_buffer (char *buffer, int buffer_size,
1076 value_list_t *vl_def, char *type_def,
1077 const data_set_t *ds, const value_list_t *vl)
1078 {
1079 char *buffer_orig = buffer;
1081 if (strcmp (vl_def->host, vl->host) != 0)
1082 {
1083 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1084 vl->host, strlen (vl->host)) != 0)
1085 return (-1);
1086 strcpy (vl_def->host, vl->host);
1087 DEBUG ("network plugin: add_to_buffer: host = %s", vl->host);
1088 }
1090 if (vl_def->time != vl->time)
1091 {
1092 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1093 (uint64_t) vl->time))
1094 return (-1);
1095 vl_def->time = vl->time;
1096 DEBUG ("network plugin: add_to_buffer: time = %u",
1097 (unsigned int) vl->time);
1098 }
1100 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1101 {
1102 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1103 vl->plugin, strlen (vl->plugin)) != 0)
1104 return (-1);
1105 strcpy (vl_def->plugin, vl->plugin);
1106 DEBUG ("network plugin: add_to_buffer: plugin = %s",
1107 vl->plugin);
1108 }
1110 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1111 {
1112 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1113 vl->plugin_instance,
1114 strlen (vl->plugin_instance)) != 0)
1115 return (-1);
1116 strcpy (vl_def->plugin_instance, vl->plugin_instance);
1117 DEBUG ("network plugin: add_to_buffer: plugin_instance = %s",
1118 vl->plugin_instance);
1119 }
1121 if (strcmp (type_def, ds->type) != 0)
1122 {
1123 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1124 ds->type, strlen (ds->type)) != 0)
1125 return (-1);
1126 strcpy (type_def, ds->type);
1127 DEBUG ("network plugin: add_to_buffer: type = %s", ds->type);
1128 }
1130 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1131 {
1132 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1133 vl->type_instance,
1134 strlen (vl->type_instance)) != 0)
1135 return (-1);
1136 strcpy (vl_def->type_instance, vl->type_instance);
1137 DEBUG ("network plugin: add_to_buffer: type_instance = %s",
1138 vl->type_instance);
1139 }
1141 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1142 return (-1);
1144 return (buffer - buffer_orig);
1145 } /* int add_to_buffer */
1147 static void flush_buffer (void)
1148 {
1149 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1150 send_buffer_fill);
1152 network_send_buffer (send_buffer, send_buffer_fill);
1153 send_buffer_ptr = send_buffer;
1154 send_buffer_fill = 0;
1155 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1156 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1157 }
1159 static int network_write (const data_set_t *ds, const value_list_t *vl)
1160 {
1161 int status;
1163 /* If the value is already in the cache, we have received it via the
1164 * network. We write it again if forwarding is activated. It's then in
1165 * the cache and should we receive it again we will ignore it. */
1166 status = cache_check (ds->type, vl);
1167 if ((network_config_forward == 0)
1168 && (status != 0))
1169 return (0);
1171 pthread_mutex_lock (&send_buffer_lock);
1173 status = add_to_buffer (send_buffer_ptr,
1174 sizeof (send_buffer) - send_buffer_fill,
1175 &send_buffer_vl, send_buffer_type,
1176 ds, vl);
1177 if (status >= 0)
1178 {
1179 /* status == bytes added to the buffer */
1180 send_buffer_fill += status;
1181 send_buffer_ptr += status;
1182 }
1183 else
1184 {
1185 flush_buffer ();
1187 status = add_to_buffer (send_buffer_ptr,
1188 sizeof (send_buffer) - send_buffer_fill,
1189 &send_buffer_vl, send_buffer_type,
1190 ds, vl);
1192 if (status >= 0)
1193 {
1194 send_buffer_fill += status;
1195 send_buffer_ptr += status;
1196 }
1197 }
1199 if (status < 0)
1200 {
1201 ERROR ("network plugin: Unable to append to the "
1202 "buffer for some weird reason");
1203 }
1204 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1205 {
1206 flush_buffer ();
1207 }
1209 pthread_mutex_unlock (&send_buffer_lock);
1211 return ((status < 0) ? -1 : 0);
1212 } /* int network_write */
1214 static int network_config (const char *key, const char *val)
1215 {
1216 char *node;
1217 char *service;
1219 char *fields[3];
1220 int fields_num;
1222 if ((strcasecmp ("Listen", key) == 0)
1223 || (strcasecmp ("Server", key) == 0))
1224 {
1225 char *val_cpy = strdup (val);
1226 if (val_cpy == NULL)
1227 return (1);
1229 service = NET_DEFAULT_PORT;
1230 fields_num = strsplit (val_cpy, fields, 3);
1231 if ((fields_num != 1)
1232 && (fields_num != 2))
1233 return (1);
1234 else if (fields_num == 2)
1235 service = fields[1];
1236 node = fields[0];
1238 if (strcasecmp ("Listen", key) == 0)
1239 network_add_listen_socket (node, service);
1240 else
1241 network_add_sending_socket (node, service);
1242 }
1243 else if (strcasecmp ("TimeToLive", key) == 0)
1244 {
1245 int tmp = atoi (val);
1246 if ((tmp > 0) && (tmp < 256))
1247 network_config_ttl = tmp;
1248 else
1249 return (1);
1250 }
1251 else if (strcasecmp ("Forward", key) == 0)
1252 {
1253 if ((strcasecmp ("true", val) == 0)
1254 || (strcasecmp ("yes", val) == 0)
1255 || (strcasecmp ("on", val) == 0))
1256 network_config_forward = 1;
1257 else
1258 network_config_forward = 0;
1259 }
1260 else if (strcasecmp ("CacheFlush", key) == 0)
1261 {
1262 int tmp = atoi (val);
1263 if (tmp > 0)
1264 cache_flush_interval = tmp;
1265 else return (1);
1266 }
1267 else
1268 {
1269 return (-1);
1270 }
1271 return (0);
1272 } /* int network_config */
1274 static int network_shutdown (void)
1275 {
1276 DEBUG ("Shutting down.");
1278 listen_loop++;
1280 if (listen_thread != (pthread_t) 0)
1281 {
1282 pthread_kill (listen_thread, SIGTERM);
1283 pthread_join (listen_thread, NULL /* no return value */);
1284 listen_thread = (pthread_t) 0;
1285 }
1287 listen_thread = 0;
1289 if (cache_tree != NULL)
1290 {
1291 void *key;
1292 void *value;
1294 while (avl_pick (cache_tree, &key, &value) == 0)
1295 {
1296 sfree (key);
1297 sfree (value);
1298 }
1299 avl_destroy (cache_tree);
1300 cache_tree = NULL;
1301 }
1303 /* TODO: Close `sending_sockets' */
1305 plugin_unregister_config ("network");
1306 plugin_unregister_init ("network");
1307 plugin_unregister_write ("network");
1308 plugin_unregister_shutdown ("network");
1310 return (0);
1311 } /* int network_shutdown */
1313 static int network_init (void)
1314 {
1315 plugin_register_shutdown ("network", network_shutdown);
1317 send_buffer_ptr = send_buffer;
1318 send_buffer_fill = 0;
1319 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1320 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1322 cache_tree = avl_create ((int (*) (const void *, const void *)) strcmp);
1323 cache_flush_last = time (NULL);
1325 /* setup socket(s) and so on */
1326 if (sending_sockets != NULL)
1327 plugin_register_write ("network", network_write);
1329 if ((listen_sockets_num != 0) && (listen_thread == 0))
1330 {
1331 int status;
1333 status = pthread_create (&listen_thread, NULL /* no attributes */,
1334 receive_thread, NULL /* no argument */);
1336 if (status != 0)
1337 {
1338 char errbuf[1024];
1339 ERROR ("network: pthread_create failed: %s",
1340 sstrerror (errno, errbuf,
1341 sizeof (errbuf)));
1342 }
1343 }
1344 return (0);
1345 } /* int network_init */
1347 void module_register (void)
1348 {
1349 plugin_register_config ("network", network_config,
1350 config_keys, config_keys_num);
1351 plugin_register_init ("network", network_init);
1352 } /* void module_register */