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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_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 ("packet is too short: buffer_len = %i", buffer_len);
389 return (-1);
390 }
392 pv.head = (part_header_t *) buffer;
393 h_length = ntohs (pv.head->length);
394 h_type = ntohs (pv.head->type);
396 assert (h_type == TYPE_VALUES);
398 pv.num_values = (uint16_t *) (pv.head + 1);
399 h_num = ntohs (*pv.num_values);
401 if (h_num != ((h_length - 6) / 9))
402 {
403 DEBUG ("`length' and `num of values' don't match");
404 return (-1);
405 }
407 pv.values_types = (uint8_t *) (pv.num_values + 1);
408 pv.values = (value_t *) (pv.values_types + h_num);
410 for (i = 0; i < h_num; i++)
411 if (pv.values_types[i] == DS_TYPE_COUNTER)
412 pv.values[i].counter = ntohll (pv.values[i].counter);
414 *ret_buffer = (void *) (pv.values + h_num);
415 *ret_buffer_len = buffer_len - h_length;
416 *ret_num_values = h_num;
417 *ret_values = pv.values;
419 return (0);
420 } /* int parse_part_values */
422 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
423 uint64_t *value)
424 {
425 part_number_t pn;
426 uint16_t len;
428 pn.head = (part_header_t *) *ret_buffer;
429 pn.value = (uint64_t *) (pn.head + 1);
431 len = ntohs (pn.head->length);
432 if (len != 12)
433 return (-1);
434 if (len > *ret_buffer_len)
435 return (-1);
436 *value = ntohll (*pn.value);
438 *ret_buffer = (void *) (pn.value + 1);
439 *ret_buffer_len -= len;
441 return (0);
442 } /* int parse_part_number */
444 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
445 char *output, int output_len)
446 {
447 char *buffer = *ret_buffer;
448 int buffer_len = *ret_buffer_len;
449 part_string_t ps;
451 uint16_t h_length;
452 uint16_t h_type;
454 DEBUG ("network plugin: parse_part_string: ret_buffer = %p;"
455 " ret_buffer_len = %i; output = %p; output_len = %i;",
456 *ret_buffer, *ret_buffer_len,
457 (void *) output, output_len);
459 ps.head = (part_header_t *) buffer;
461 h_length = ntohs (ps.head->length);
462 h_type = ntohs (ps.head->type);
464 DEBUG ("network plugin: parse_part_string: length = %hu; type = %hu;",
465 h_length, h_type);
467 if (buffer_len < h_length)
468 {
469 DEBUG ("packet is too short");
470 return (-1);
471 }
472 assert ((h_type == TYPE_HOST)
473 || (h_type == TYPE_PLUGIN)
474 || (h_type == TYPE_PLUGIN_INSTANCE)
475 || (h_type == TYPE_TYPE)
476 || (h_type == TYPE_TYPE_INSTANCE));
478 ps.value = buffer + 4;
479 if (ps.value[h_length - 5] != '\0')
480 {
481 DEBUG ("String does not end with a nullbyte");
482 return (-1);
483 }
485 if (output_len < (h_length - 4))
486 {
487 DEBUG ("output buffer is too small");
488 return (-1);
489 }
490 strcpy (output, ps.value);
492 DEBUG ("network plugin: parse_part_string: output = %s", output);
494 *ret_buffer = (void *) (buffer + h_length);
495 *ret_buffer_len = buffer_len - h_length;
497 return (0);
498 } /* int parse_part_string */
500 static int parse_packet (void *buffer, int buffer_len)
501 {
502 part_header_t *header;
503 int status;
505 value_list_t vl = VALUE_LIST_INIT;
506 char type[DATA_MAX_NAME_LEN];
508 DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
509 buffer, buffer_len);
511 memset (&vl, '\0', sizeof (vl));
512 memset (&type, '\0', sizeof (type));
513 status = 0;
515 while ((status == 0) && (buffer_len > sizeof (part_header_t)))
516 {
517 header = (part_header_t *) buffer;
519 if (ntohs (header->length) > buffer_len)
520 break;
521 /* Assure that this loop terminates eventually */
522 if (ntohs (header->length) < 4)
523 break;
525 if (ntohs (header->type) == TYPE_VALUES)
526 {
527 status = parse_part_values (&buffer, &buffer_len,
528 &vl.values, &vl.values_len);
530 if (status != 0)
531 {
532 DEBUG ("parse_part_values failed.");
533 break;
534 }
536 if ((vl.time > 0)
537 && (strlen (vl.host) > 0)
538 && (strlen (vl.plugin) > 0)
539 && (strlen (type) > 0)
540 && (cache_check (type, &vl) == 0))
541 {
542 DEBUG ("network plugin: parse_packet:"
543 " dispatching values");
544 plugin_dispatch_values (type, &vl);
545 }
546 else
547 {
548 DEBUG ("network plugin: parse_packet:"
549 " NOT dispatching values");
550 }
551 }
552 else if (ntohs (header->type) == TYPE_TIME)
553 {
554 uint64_t tmp = 0;
555 status = parse_part_number (&buffer, &buffer_len, &tmp);
556 if (status == 0)
557 vl.time = (time_t) tmp;
558 }
559 else if (ntohs (header->type) == TYPE_HOST)
560 {
561 status = parse_part_string (&buffer, &buffer_len,
562 vl.host, sizeof (vl.host));
563 DEBUG ("network plugin: parse_packet: vl.host = %s", vl.host);
564 }
565 else if (ntohs (header->type) == TYPE_PLUGIN)
566 {
567 status = parse_part_string (&buffer, &buffer_len,
568 vl.plugin, sizeof (vl.plugin));
569 DEBUG ("network plugin: parse_packet: vl.plugin = %s", vl.plugin);
570 }
571 else if (ntohs (header->type) == TYPE_PLUGIN_INSTANCE)
572 {
573 status = parse_part_string (&buffer, &buffer_len,
574 vl.plugin_instance, sizeof (vl.plugin_instance));
575 DEBUG ("network plugin: parse_packet: vl.plugin_instance = %s", vl.plugin_instance);
576 }
577 else if (ntohs (header->type) == TYPE_TYPE)
578 {
579 status = parse_part_string (&buffer, &buffer_len,
580 type, sizeof (type));
581 DEBUG ("network plugin: parse_packet: type = %s", type);
582 }
583 else if (ntohs (header->type) == TYPE_TYPE_INSTANCE)
584 {
585 status = parse_part_string (&buffer, &buffer_len,
586 vl.type_instance, sizeof (vl.type_instance));
587 DEBUG ("network plugin: parse_packet: vl.type_instance = %s", vl.type_instance);
588 }
589 else
590 {
591 DEBUG ("network plugin: parse_packet: Unknown part"
592 " type: 0x%0hx", ntohs (header->type));
593 buffer = ((char *) buffer) + ntohs (header->length);
594 }
595 } /* while (buffer_len > sizeof (part_header_t)) */
597 return (0);
598 } /* int parse_packet */
600 static void free_sockent (sockent_t *se)
601 {
602 sockent_t *next;
603 while (se != NULL)
604 {
605 next = se->next;
606 free (se->addr);
607 free (se);
608 se = next;
609 }
610 } /* void free_sockent */
612 /*
613 * int network_set_ttl
614 *
615 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
616 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
617 *
618 * The `struct addrinfo' is used to destinguish between unicast and multicast
619 * sockets.
620 */
621 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
622 {
623 if ((network_config_ttl < 1) || (network_config_ttl > 255))
624 return (-1);
626 DEBUG ("ttl = %i", network_config_ttl);
628 if (ai->ai_family == AF_INET)
629 {
630 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
631 int optname;
633 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
634 optname = IP_MULTICAST_TTL;
635 else
636 optname = IP_TTL;
638 if (setsockopt (se->fd, IPPROTO_IP, optname,
639 &network_config_ttl,
640 sizeof (network_config_ttl)) == -1)
641 {
642 char errbuf[1024];
643 ERROR ("setsockopt: %s",
644 sstrerror (errno, errbuf, sizeof (errbuf)));
645 return (-1);
646 }
647 }
648 else if (ai->ai_family == AF_INET6)
649 {
650 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
651 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
652 int optname;
654 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
655 optname = IPV6_MULTICAST_HOPS;
656 else
657 optname = IPV6_UNICAST_HOPS;
659 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
660 &network_config_ttl,
661 sizeof (network_config_ttl)) == -1)
662 {
663 char errbuf[1024];
664 ERROR ("setsockopt: %s",
665 sstrerror (errno, errbuf,
666 sizeof (errbuf)));
667 return (-1);
668 }
669 }
671 return (0);
672 } /* int network_set_ttl */
674 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
675 {
676 int loop = 0;
678 DEBUG ("fd = %i; calling `bind'", se->fd);
680 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
681 {
682 char errbuf[1024];
683 ERROR ("bind: %s",
684 sstrerror (errno, errbuf, sizeof (errbuf)));
685 return (-1);
686 }
688 if (ai->ai_family == AF_INET)
689 {
690 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
691 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
692 {
693 struct ip_mreq mreq;
695 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
697 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
698 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
700 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
701 &loop, sizeof (loop)) == -1)
702 {
703 char errbuf[1024];
704 ERROR ("setsockopt: %s",
705 sstrerror (errno, errbuf,
706 sizeof (errbuf)));
707 return (-1);
708 }
710 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
711 &mreq, sizeof (mreq)) == -1)
712 {
713 char errbuf[1024];
714 ERROR ("setsockopt: %s",
715 sstrerror (errno, errbuf,
716 sizeof (errbuf)));
717 return (-1);
718 }
719 }
720 }
721 else if (ai->ai_family == AF_INET6)
722 {
723 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
724 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
725 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
726 {
727 struct ipv6_mreq mreq;
729 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
731 memcpy (&mreq.ipv6mr_multiaddr,
732 &addr->sin6_addr,
733 sizeof (addr->sin6_addr));
735 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
736 * ipv6mr_interface may be set to zeroes to
737 * choose the default multicast interface or to
738 * the index of a particular multicast-capable
739 * interface if the host is multihomed.
740 * Membership is associ-associated with a
741 * single interface; programs running on
742 * multihomed hosts may need to join the same
743 * group on more than one interface.*/
744 mreq.ipv6mr_interface = 0;
746 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
747 &loop, sizeof (loop)) == -1)
748 {
749 char errbuf[1024];
750 ERROR ("setsockopt: %s",
751 sstrerror (errno, errbuf,
752 sizeof (errbuf)));
753 return (-1);
754 }
756 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
757 &mreq, sizeof (mreq)) == -1)
758 {
759 char errbuf[1024];
760 ERROR ("setsockopt: %s",
761 sstrerror (errno, errbuf,
762 sizeof (errbuf)));
763 return (-1);
764 }
765 }
766 }
768 return (0);
769 } /* int network_bind_socket */
771 static sockent_t *network_create_socket (const char *node,
772 const char *service,
773 int listen)
774 {
775 struct addrinfo ai_hints;
776 struct addrinfo *ai_list, *ai_ptr;
777 int ai_return;
779 sockent_t *se_head = NULL;
780 sockent_t *se_tail = NULL;
782 DEBUG ("node = %s, service = %s", node, service);
784 memset (&ai_hints, '\0', sizeof (ai_hints));
785 ai_hints.ai_flags = 0;
786 #ifdef AI_PASSIVE
787 ai_hints.ai_flags |= AI_PASSIVE;
788 #endif
789 #ifdef AI_ADDRCONFIG
790 ai_hints.ai_flags |= AI_ADDRCONFIG;
791 #endif
792 ai_hints.ai_family = AF_UNSPEC;
793 ai_hints.ai_socktype = SOCK_DGRAM;
794 ai_hints.ai_protocol = IPPROTO_UDP;
796 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
797 if (ai_return != 0)
798 {
799 char errbuf[1024];
800 ERROR ("getaddrinfo (%s, %s): %s",
801 (node == NULL) ? "(null)" : node,
802 (service == NULL) ? "(null)" : service,
803 (ai_return == EAI_SYSTEM)
804 ? sstrerror (errno, errbuf, sizeof (errbuf))
805 : gai_strerror (ai_return));
806 return (NULL);
807 }
809 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
810 {
811 sockent_t *se;
813 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
814 {
815 char errbuf[1024];
816 ERROR ("malloc: %s",
817 sstrerror (errno, errbuf,
818 sizeof (errbuf)));
819 continue;
820 }
822 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
823 {
824 char errbuf[1024];
825 ERROR ("malloc: %s",
826 sstrerror (errno, errbuf,
827 sizeof (errbuf)));
828 free (se);
829 continue;
830 }
832 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
833 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
834 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
835 se->addrlen = ai_ptr->ai_addrlen;
837 se->fd = socket (ai_ptr->ai_family,
838 ai_ptr->ai_socktype,
839 ai_ptr->ai_protocol);
840 se->next = NULL;
842 if (se->fd == -1)
843 {
844 char errbuf[1024];
845 ERROR ("socket: %s",
846 sstrerror (errno, errbuf,
847 sizeof (errbuf)));
848 free (se->addr);
849 free (se);
850 continue;
851 }
853 if (listen != 0)
854 {
855 if (network_bind_socket (se, ai_ptr) != 0)
856 {
857 close (se->fd);
858 free (se->addr);
859 free (se);
860 continue;
861 }
862 }
863 else /* listen == 0 */
864 {
865 network_set_ttl (se, ai_ptr);
866 }
868 if (se_tail == NULL)
869 {
870 se_head = se;
871 se_tail = se;
872 }
873 else
874 {
875 se_tail->next = se;
876 se_tail = se;
877 }
879 /* We don't open more than one write-socket per node/service pair.. */
880 if (listen == 0)
881 break;
882 }
884 freeaddrinfo (ai_list);
886 return (se_head);
887 } /* sockent_t *network_create_socket */
889 static sockent_t *network_create_default_socket (int listen)
890 {
891 sockent_t *se_ptr = NULL;
892 sockent_t *se_head = NULL;
893 sockent_t *se_tail = NULL;
895 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
896 NET_DEFAULT_PORT, listen);
898 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
899 if ((listen == 0) && (se_ptr != NULL))
900 return (se_ptr);
902 if (se_ptr != NULL)
903 {
904 se_head = se_ptr;
905 se_tail = se_ptr;
906 while (se_tail->next != NULL)
907 se_tail = se_tail->next;
908 }
910 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
912 if (se_tail == NULL)
913 return (se_ptr);
915 se_tail->next = se_ptr;
916 return (se_head);
917 } /* sockent_t *network_create_default_socket */
919 static int network_add_listen_socket (const char *node, const char *service)
920 {
921 sockent_t *se;
922 sockent_t *se_ptr;
923 int se_num = 0;
925 if (service == NULL)
926 service = NET_DEFAULT_PORT;
928 if (node == NULL)
929 se = network_create_default_socket (1 /* listen == true */);
930 else
931 se = network_create_socket (node, service, 1 /* listen == true */);
933 if (se == NULL)
934 return (-1);
936 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
937 se_num++;
939 listen_sockets = (struct pollfd *) realloc (listen_sockets,
940 (listen_sockets_num + se_num)
941 * sizeof (struct pollfd));
943 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
944 {
945 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
946 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
947 listen_sockets[listen_sockets_num].revents = 0;
948 listen_sockets_num++;
949 } /* for (se) */
951 free_sockent (se);
952 return (0);
953 } /* int network_add_listen_socket */
955 static int network_add_sending_socket (const char *node, const char *service)
956 {
957 sockent_t *se;
958 sockent_t *se_ptr;
960 if (service == NULL)
961 service = NET_DEFAULT_PORT;
963 if (node == NULL)
964 se = network_create_default_socket (0 /* listen == false */);
965 else
966 se = network_create_socket (node, service, 0 /* listen == false */);
968 if (se == NULL)
969 return (-1);
971 if (sending_sockets == NULL)
972 {
973 sending_sockets = se;
974 return (0);
975 }
977 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
978 /* seek end */;
980 se_ptr->next = se;
981 return (0);
982 } /* int network_get_listen_socket */
984 int network_receive (void)
985 {
986 char buffer[BUFF_SIZE];
987 int buffer_len;
989 int i;
990 int status;
992 if (listen_sockets_num == 0)
993 network_add_listen_socket (NULL, NULL);
995 if (listen_sockets_num == 0)
996 {
997 ERROR ("network: Failed to open a listening socket.");
998 return (-1);
999 }
1001 while (listen_loop == 0)
1002 {
1003 status = poll (listen_sockets, listen_sockets_num, -1);
1005 if (status <= 0)
1006 {
1007 char errbuf[1024];
1008 if (errno == EINTR)
1009 continue;
1010 ERROR ("poll failed: %s",
1011 sstrerror (errno, errbuf, sizeof (errbuf)));
1012 return (-1);
1013 }
1015 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1016 {
1017 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1018 continue;
1019 status--;
1021 buffer_len = recv (listen_sockets[i].fd,
1022 buffer, sizeof (buffer),
1023 0 /* no flags */);
1024 if (buffer_len < 0)
1025 {
1026 char errbuf[1024];
1027 ERROR ("recv failed: %s",
1028 sstrerror (errno, errbuf,
1029 sizeof (errbuf)));
1030 return (-1);
1031 }
1033 parse_packet (buffer, buffer_len);
1034 } /* for (listen_sockets) */
1035 } /* while (listen_loop == 0) */
1037 return (0);
1038 }
1040 static void *receive_thread (void *arg)
1041 {
1042 return (network_receive () ? (void *) 1 : (void *) 0);
1043 } /* void *receive_thread */
1045 static void network_send_buffer (const char *buffer, int buffer_len)
1046 {
1047 sockent_t *se;
1048 int status;
1050 DEBUG ("buffer_len = %i", buffer_len);
1052 for (se = sending_sockets; se != NULL; se = se->next)
1053 {
1054 while (42)
1055 {
1056 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1057 (struct sockaddr *) se->addr, se->addrlen);
1058 if (status < 0)
1059 {
1060 char errbuf[1024];
1061 if (errno == EINTR)
1062 continue;
1063 ERROR ("network plugin: sendto failed: %s",
1064 sstrerror (errno, errbuf,
1065 sizeof (errbuf)));
1066 break;
1067 }
1069 break;
1070 } /* while (42) */
1071 } /* for (sending_sockets) */
1072 } /* void network_send_buffer */
1074 static int add_to_buffer (char *buffer, int buffer_size,
1075 value_list_t *vl_def, char *type_def,
1076 const data_set_t *ds, const value_list_t *vl)
1077 {
1078 char *buffer_orig = buffer;
1080 if (strcmp (vl_def->host, vl->host) != 0)
1081 {
1082 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1083 vl->host, strlen (vl->host)) != 0)
1084 return (-1);
1085 strcpy (vl_def->host, vl->host);
1086 DEBUG ("network plugin: add_to_buffer: host = %s", vl->host);
1087 }
1089 if (vl_def->time != vl->time)
1090 {
1091 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1092 (uint64_t) vl->time))
1093 return (-1);
1094 vl_def->time = vl->time;
1095 DEBUG ("network plugin: add_to_buffer: time = %u",
1096 (unsigned int) vl->time);
1097 }
1099 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1100 {
1101 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1102 vl->plugin, strlen (vl->plugin)) != 0)
1103 return (-1);
1104 strcpy (vl_def->plugin, vl->plugin);
1105 DEBUG ("network plugin: add_to_buffer: plugin = %s",
1106 vl->plugin);
1107 }
1109 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1110 {
1111 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1112 vl->plugin_instance,
1113 strlen (vl->plugin_instance)) != 0)
1114 return (-1);
1115 strcpy (vl_def->plugin_instance, vl->plugin_instance);
1116 DEBUG ("network plugin: add_to_buffer: plugin_instance = %s",
1117 vl->plugin_instance);
1118 }
1120 if (strcmp (type_def, ds->type) != 0)
1121 {
1122 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1123 ds->type, strlen (ds->type)) != 0)
1124 return (-1);
1125 strcpy (type_def, ds->type);
1126 DEBUG ("network plugin: add_to_buffer: type = %s", ds->type);
1127 }
1129 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1130 {
1131 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1132 vl->type_instance,
1133 strlen (vl->type_instance)) != 0)
1134 return (-1);
1135 strcpy (vl_def->type_instance, vl->type_instance);
1136 DEBUG ("network plugin: add_to_buffer: type_instance = %s",
1137 vl->type_instance);
1138 }
1140 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1141 return (-1);
1143 return (buffer - buffer_orig);
1144 } /* int add_to_buffer */
1146 static void flush_buffer (void)
1147 {
1148 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1149 send_buffer_fill);
1151 network_send_buffer (send_buffer, send_buffer_fill);
1152 send_buffer_ptr = send_buffer;
1153 send_buffer_fill = 0;
1154 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1155 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1156 }
1158 static int network_write (const data_set_t *ds, const value_list_t *vl)
1159 {
1160 int status;
1162 /* If the value is already in the cache, we have received it via the
1163 * network. We write it again if forwarding is activated. It's then in
1164 * the cache and should we receive it again we will ignore it. */
1165 status = cache_check (ds->type, vl);
1166 if ((network_config_forward == 0)
1167 && (status != 0))
1168 return (0);
1170 pthread_mutex_lock (&send_buffer_lock);
1172 status = add_to_buffer (send_buffer_ptr,
1173 sizeof (send_buffer) - send_buffer_fill,
1174 &send_buffer_vl, send_buffer_type,
1175 ds, vl);
1176 if (status >= 0)
1177 {
1178 /* status == bytes added to the buffer */
1179 send_buffer_fill += status;
1180 send_buffer_ptr += status;
1181 }
1182 else
1183 {
1184 flush_buffer ();
1186 status = add_to_buffer (send_buffer_ptr,
1187 sizeof (send_buffer) - send_buffer_fill,
1188 &send_buffer_vl, send_buffer_type,
1189 ds, vl);
1191 if (status >= 0)
1192 {
1193 send_buffer_fill += status;
1194 send_buffer_ptr += status;
1195 }
1196 }
1198 if (status < 0)
1199 {
1200 ERROR ("network plugin: Unable to append to the "
1201 "buffer for some weird reason");
1202 }
1203 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1204 {
1205 flush_buffer ();
1206 }
1208 pthread_mutex_unlock (&send_buffer_lock);
1210 return ((status < 0) ? -1 : 0);
1211 } /* int network_write */
1213 static int network_config (const char *key, const char *val)
1214 {
1215 char *node;
1216 char *service;
1218 char *fields[3];
1219 int fields_num;
1221 if ((strcasecmp ("Listen", key) == 0)
1222 || (strcasecmp ("Server", key) == 0))
1223 {
1224 char *val_cpy = strdup (val);
1225 if (val_cpy == NULL)
1226 return (1);
1228 service = NET_DEFAULT_PORT;
1229 fields_num = strsplit (val_cpy, fields, 3);
1230 if ((fields_num != 1)
1231 && (fields_num != 2))
1232 return (1);
1233 else if (fields_num == 2)
1234 service = fields[1];
1235 node = fields[0];
1237 if (strcasecmp ("Listen", key) == 0)
1238 network_add_listen_socket (node, service);
1239 else
1240 network_add_sending_socket (node, service);
1241 }
1242 else if (strcasecmp ("TimeToLive", key) == 0)
1243 {
1244 int tmp = atoi (val);
1245 if ((tmp > 0) && (tmp < 256))
1246 network_config_ttl = tmp;
1247 else
1248 return (1);
1249 }
1250 else if (strcasecmp ("Forward", key) == 0)
1251 {
1252 if ((strcasecmp ("true", val) == 0)
1253 || (strcasecmp ("yes", val) == 0)
1254 || (strcasecmp ("on", val) == 0))
1255 network_config_forward = 1;
1256 else
1257 network_config_forward = 0;
1258 }
1259 else if (strcasecmp ("CacheFlush", key) == 0)
1260 {
1261 int tmp = atoi (val);
1262 if (tmp > 0)
1263 cache_flush_interval = tmp;
1264 else return (1);
1265 }
1266 else
1267 {
1268 return (-1);
1269 }
1270 return (0);
1271 } /* int network_config */
1273 static int network_shutdown (void)
1274 {
1275 DEBUG ("Shutting down.");
1277 listen_loop++;
1279 if (listen_thread != (pthread_t) 0)
1280 {
1281 pthread_kill (listen_thread, SIGTERM);
1282 pthread_join (listen_thread, NULL /* no return value */);
1283 listen_thread = (pthread_t) 0;
1284 }
1286 listen_thread = 0;
1288 if (cache_tree != NULL)
1289 {
1290 void *key;
1291 void *value;
1293 while (avl_pick (cache_tree, &key, &value) == 0)
1294 {
1295 sfree (key);
1296 sfree (value);
1297 }
1298 avl_destroy (cache_tree);
1299 cache_tree = NULL;
1300 }
1302 /* TODO: Close `sending_sockets' */
1304 plugin_unregister_config ("network");
1305 plugin_unregister_init ("network");
1306 plugin_unregister_write ("network");
1307 plugin_unregister_shutdown ("network");
1309 return (0);
1310 } /* int network_shutdown */
1312 static int network_init (void)
1313 {
1314 plugin_register_shutdown ("network", network_shutdown);
1316 send_buffer_ptr = send_buffer;
1317 send_buffer_fill = 0;
1318 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1319 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1321 cache_tree = avl_create ((int (*) (const void *, const void *)) strcmp);
1322 cache_flush_last = time (NULL);
1324 /* setup socket(s) and so on */
1325 if (sending_sockets != NULL)
1326 plugin_register_write ("network", network_write);
1328 if ((listen_sockets_num != 0) && (listen_thread == 0))
1329 {
1330 int status;
1332 status = pthread_create (&listen_thread, NULL /* no attributes */,
1333 receive_thread, NULL /* no argument */);
1335 if (status != 0)
1336 {
1337 char errbuf[1024];
1338 ERROR ("network: pthread_create failed: %s",
1339 sstrerror (errno, errbuf,
1340 sizeof (errbuf)));
1341 }
1342 }
1343 return (0);
1344 } /* int network_init */
1346 void module_register (void)
1347 {
1348 plugin_register_config ("network", network_config,
1349 config_keys, config_keys_num);
1350 plugin_register_init ("network", network_init);
1351 }