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 "Listen",
145 "Server",
146 "TimeToLive",
147 "Forward"
148 };
149 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
151 static int network_config_ttl = 0;
152 static int network_config_forward = 0;
154 static sockent_t *sending_sockets = NULL;
156 static struct pollfd *listen_sockets = NULL;
157 static int listen_sockets_num = 0;
158 static pthread_t listen_thread = 0;
159 static int listen_loop = 0;
161 static char send_buffer[BUFF_SIZE];
162 static char *send_buffer_ptr;
163 static int send_buffer_fill;
164 static value_list_t send_buffer_vl = VALUE_LIST_INIT;
165 static char send_buffer_type[DATA_MAX_NAME_LEN];
166 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
168 static avl_tree_t *cache_tree = NULL;
169 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
171 /*
172 * Private functions
173 */
174 static int cache_check (const char *type, const value_list_t *vl)
175 {
176 char key[1024];
177 time_t *value = NULL;
178 int retval = -1;
180 if (cache_tree == NULL)
181 return (-1);
183 if (format_name (key, sizeof (key), vl->host, vl->plugin,
184 vl->plugin_instance, type, vl->type_instance))
185 return (-1);
187 pthread_mutex_lock (&cache_lock);
189 if (avl_get (cache_tree, key, (void *) &value) == 0)
190 {
191 if (*value < vl->time)
192 {
193 *value = vl->time;
194 retval = 0;
195 }
196 else
197 {
198 DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
199 (int) *value, (int) vl->time);
200 retval = 1;
201 }
202 }
203 else
204 {
205 char *key_copy = strdup (key);
206 value = malloc (sizeof (time_t));
207 if ((key_copy != NULL) && (value != NULL))
208 {
209 *value = vl->time;
210 avl_insert (cache_tree, key_copy, value);
211 retval = 0;
212 }
213 else
214 {
215 sfree (key_copy);
216 sfree (value);
217 }
218 }
220 /* TODO: Flush cache */
222 pthread_mutex_unlock (&cache_lock);
224 DEBUG ("network plugin: cache_check: key = %s; time = %i; retval = %i",
225 key, (int) vl->time, retval);
227 return (retval);
228 } /* int cache_check */
230 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
231 const data_set_t *ds, const value_list_t *vl)
232 {
233 part_values_t pv;
234 int i;
236 i = 6 + (9 * vl->values_len);
237 if (*ret_buffer_len < i)
238 return (-1);
239 *ret_buffer_len -= i;
241 pv.head = (part_header_t *) *ret_buffer;
242 pv.num_values = (uint16_t *) (pv.head + 1);
243 pv.values_types = (uint8_t *) (pv.num_values + 1);
244 pv.values = (value_t *) (pv.values_types + vl->values_len);
245 *ret_buffer = (void *) (pv.values + vl->values_len);
247 pv.head->type = htons (TYPE_VALUES);
248 pv.head->length = htons (6 + (9 * vl->values_len));
249 *pv.num_values = htons ((uint16_t) vl->values_len);
251 for (i = 0; i < vl->values_len; i++)
252 {
253 if (ds->ds[i].type == DS_TYPE_COUNTER)
254 {
255 pv.values_types[i] = DS_TYPE_COUNTER;
256 pv.values[i].counter = htonll (vl->values[i].counter);
257 }
258 else
259 {
260 pv.values_types[i] = DS_TYPE_GAUGE;
261 pv.values[i].gauge = vl->values[i].gauge;
262 }
263 } /* for (values) */
265 return (0);
266 } /* int write_part_values */
268 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
269 int type, uint64_t value)
270 {
271 part_number_t pn;
273 if (*ret_buffer_len < 12)
274 return (-1);
276 pn.head = (part_header_t *) *ret_buffer;
277 pn.value = (uint64_t *) (pn.head + 1);
279 pn.head->type = htons (type);
280 pn.head->length = htons (12);
281 *pn.value = htonll (value);
283 *ret_buffer = (char *) (pn.value + 1);
284 *ret_buffer_len -= 12;
286 return (0);
287 } /* int write_part_number */
289 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
290 int type, const char *str, int str_len)
291 {
292 part_string_t ps;
293 int len;
295 len = 4 + str_len + 1;
296 if (*ret_buffer_len < len)
297 return (-1);
298 *ret_buffer_len -= len;
300 ps.head = (part_header_t *) *ret_buffer;
301 ps.value = (char *) (ps.head + 1);
303 ps.head->type = htons ((uint16_t) type);
304 ps.head->length = htons ((uint16_t) str_len + 5);
305 if (str_len > 0)
306 memcpy (ps.value, str, str_len);
307 ps.value[str_len] = '\0';
308 *ret_buffer = (void *) (ps.value + (str_len + 1));
310 return (0);
311 } /* int write_part_string */
313 static int parse_part_values (void **ret_buffer, int *ret_buffer_len,
314 value_t **ret_values, int *ret_num_values)
315 {
316 char *buffer = *ret_buffer;
317 int buffer_len = *ret_buffer_len;
318 part_values_t pv;
319 int i;
321 uint16_t h_length;
322 uint16_t h_type;
323 uint16_t h_num;
325 if (buffer_len < (15))
326 {
327 DEBUG ("packet is too short: buffer_len = %i", buffer_len);
328 return (-1);
329 }
331 pv.head = (part_header_t *) buffer;
332 h_length = ntohs (pv.head->length);
333 h_type = ntohs (pv.head->type);
335 assert (h_type == TYPE_VALUES);
337 pv.num_values = (uint16_t *) (pv.head + 1);
338 h_num = ntohs (*pv.num_values);
340 if (h_num != ((h_length - 6) / 9))
341 {
342 DEBUG ("`length' and `num of values' don't match");
343 return (-1);
344 }
346 pv.values_types = (uint8_t *) (pv.num_values + 1);
347 pv.values = (value_t *) (pv.values_types + h_num);
349 for (i = 0; i < h_num; i++)
350 if (pv.values_types[i] == DS_TYPE_COUNTER)
351 pv.values[i].counter = ntohll (pv.values[i].counter);
353 *ret_buffer = (void *) (pv.values + h_num);
354 *ret_buffer_len = buffer_len - h_length;
355 *ret_num_values = h_num;
356 *ret_values = pv.values;
358 return (0);
359 } /* int parse_part_values */
361 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
362 uint64_t *value)
363 {
364 part_number_t pn;
365 uint16_t len;
367 pn.head = (part_header_t *) *ret_buffer;
368 pn.value = (uint64_t *) (pn.head + 1);
370 len = ntohs (pn.head->length);
371 if (len != 12)
372 return (-1);
373 if (len > *ret_buffer_len)
374 return (-1);
375 *value = ntohll (*pn.value);
377 *ret_buffer = (void *) (pn.value + 1);
378 *ret_buffer_len -= len;
380 return (0);
381 } /* int parse_part_number */
383 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
384 char *output, int output_len)
385 {
386 char *buffer = *ret_buffer;
387 int buffer_len = *ret_buffer_len;
388 part_string_t ps;
390 uint16_t h_length;
391 uint16_t h_type;
393 DEBUG ("network plugin: parse_part_string: ret_buffer = %p;"
394 " ret_buffer_len = %i; output = %p; output_len = %i;",
395 *ret_buffer, *ret_buffer_len,
396 (void *) output, output_len);
398 ps.head = (part_header_t *) buffer;
400 h_length = ntohs (ps.head->length);
401 h_type = ntohs (ps.head->type);
403 DEBUG ("network plugin: parse_part_string: length = %hu; type = %hu;",
404 h_length, h_type);
406 if (buffer_len < h_length)
407 {
408 DEBUG ("packet is too short");
409 return (-1);
410 }
411 assert ((h_type == TYPE_HOST)
412 || (h_type == TYPE_PLUGIN)
413 || (h_type == TYPE_PLUGIN_INSTANCE)
414 || (h_type == TYPE_TYPE)
415 || (h_type == TYPE_TYPE_INSTANCE));
417 ps.value = buffer + 4;
418 if (ps.value[h_length - 5] != '\0')
419 {
420 DEBUG ("String does not end with a nullbyte");
421 return (-1);
422 }
424 if (output_len < (h_length - 4))
425 {
426 DEBUG ("output buffer is too small");
427 return (-1);
428 }
429 strcpy (output, ps.value);
431 DEBUG ("network plugin: parse_part_string: output = %s", output);
433 *ret_buffer = (void *) (buffer + h_length);
434 *ret_buffer_len = buffer_len - h_length;
436 return (0);
437 } /* int parse_part_string */
439 static int parse_packet (void *buffer, int buffer_len)
440 {
441 part_header_t *header;
442 int status;
444 value_list_t vl = VALUE_LIST_INIT;
445 char type[DATA_MAX_NAME_LEN];
447 DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
448 buffer, buffer_len);
450 memset (&vl, '\0', sizeof (vl));
451 memset (&type, '\0', sizeof (type));
452 status = 0;
454 while ((status == 0) && (buffer_len > sizeof (part_header_t)))
455 {
456 header = (part_header_t *) buffer;
458 if (ntohs (header->length) > buffer_len)
459 break;
460 /* Assure that this loop terminates eventually */
461 if (ntohs (header->length) < 4)
462 break;
464 if (ntohs (header->type) == TYPE_VALUES)
465 {
466 status = parse_part_values (&buffer, &buffer_len,
467 &vl.values, &vl.values_len);
469 if (status != 0)
470 {
471 DEBUG ("parse_part_values failed.");
472 break;
473 }
475 if ((vl.time > 0)
476 && (strlen (vl.host) > 0)
477 && (strlen (vl.plugin) > 0)
478 && (strlen (type) > 0)
479 && (cache_check (type, &vl) == 0))
480 {
481 DEBUG ("network plugin: parse_packet:"
482 " dispatching values");
483 plugin_dispatch_values (type, &vl);
484 }
485 else
486 {
487 DEBUG ("network plugin: parse_packet:"
488 " NOT dispatching values");
489 }
490 }
491 else if (ntohs (header->type) == TYPE_TIME)
492 {
493 uint64_t tmp = 0;
494 status = parse_part_number (&buffer, &buffer_len, &tmp);
495 if (status == 0)
496 vl.time = (time_t) tmp;
497 }
498 else if (ntohs (header->type) == TYPE_HOST)
499 {
500 status = parse_part_string (&buffer, &buffer_len,
501 vl.host, sizeof (vl.host));
502 DEBUG ("network plugin: parse_packet: vl.host = %s", vl.host);
503 }
504 else if (ntohs (header->type) == TYPE_PLUGIN)
505 {
506 status = parse_part_string (&buffer, &buffer_len,
507 vl.plugin, sizeof (vl.plugin));
508 DEBUG ("network plugin: parse_packet: vl.plugin = %s", vl.plugin);
509 }
510 else if (ntohs (header->type) == TYPE_PLUGIN_INSTANCE)
511 {
512 status = parse_part_string (&buffer, &buffer_len,
513 vl.plugin_instance, sizeof (vl.plugin_instance));
514 DEBUG ("network plugin: parse_packet: vl.plugin_instance = %s", vl.plugin_instance);
515 }
516 else if (ntohs (header->type) == TYPE_TYPE)
517 {
518 status = parse_part_string (&buffer, &buffer_len,
519 type, sizeof (type));
520 DEBUG ("network plugin: parse_packet: type = %s", type);
521 }
522 else if (ntohs (header->type) == TYPE_TYPE_INSTANCE)
523 {
524 status = parse_part_string (&buffer, &buffer_len,
525 vl.type_instance, sizeof (vl.type_instance));
526 DEBUG ("network plugin: parse_packet: vl.type_instance = %s", vl.type_instance);
527 }
528 else
529 {
530 DEBUG ("network plugin: parse_packet: Unknown part"
531 " type: 0x%0hx", ntohs (header->type));
532 buffer = ((char *) buffer) + ntohs (header->length);
533 }
534 } /* while (buffer_len > sizeof (part_header_t)) */
536 return (0);
537 } /* int parse_packet */
539 static void free_sockent (sockent_t *se)
540 {
541 sockent_t *next;
542 while (se != NULL)
543 {
544 next = se->next;
545 free (se->addr);
546 free (se);
547 se = next;
548 }
549 } /* void free_sockent */
551 /*
552 * int network_set_ttl
553 *
554 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
555 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
556 *
557 * The `struct addrinfo' is used to destinguish between unicast and multicast
558 * sockets.
559 */
560 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
561 {
562 if ((network_config_ttl < 1) || (network_config_ttl > 255))
563 return (-1);
565 DEBUG ("ttl = %i", network_config_ttl);
567 if (ai->ai_family == AF_INET)
568 {
569 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
570 int optname;
572 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
573 optname = IP_MULTICAST_TTL;
574 else
575 optname = IP_TTL;
577 if (setsockopt (se->fd, IPPROTO_IP, optname,
578 &network_config_ttl,
579 sizeof (network_config_ttl)) == -1)
580 {
581 char errbuf[1024];
582 ERROR ("setsockopt: %s",
583 sstrerror (errno, errbuf, sizeof (errbuf)));
584 return (-1);
585 }
586 }
587 else if (ai->ai_family == AF_INET6)
588 {
589 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
590 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
591 int optname;
593 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
594 optname = IPV6_MULTICAST_HOPS;
595 else
596 optname = IPV6_UNICAST_HOPS;
598 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
599 &network_config_ttl,
600 sizeof (network_config_ttl)) == -1)
601 {
602 char errbuf[1024];
603 ERROR ("setsockopt: %s",
604 sstrerror (errno, errbuf,
605 sizeof (errbuf)));
606 return (-1);
607 }
608 }
610 return (0);
611 } /* int network_set_ttl */
613 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
614 {
615 int loop = 0;
617 DEBUG ("fd = %i; calling `bind'", se->fd);
619 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
620 {
621 char errbuf[1024];
622 ERROR ("bind: %s",
623 sstrerror (errno, errbuf, sizeof (errbuf)));
624 return (-1);
625 }
627 if (ai->ai_family == AF_INET)
628 {
629 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
630 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
631 {
632 struct ip_mreq mreq;
634 DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
636 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
637 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
639 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
640 &loop, sizeof (loop)) == -1)
641 {
642 char errbuf[1024];
643 ERROR ("setsockopt: %s",
644 sstrerror (errno, errbuf,
645 sizeof (errbuf)));
646 return (-1);
647 }
649 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
650 &mreq, sizeof (mreq)) == -1)
651 {
652 char errbuf[1024];
653 ERROR ("setsockopt: %s",
654 sstrerror (errno, errbuf,
655 sizeof (errbuf)));
656 return (-1);
657 }
658 }
659 }
660 else if (ai->ai_family == AF_INET6)
661 {
662 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
663 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
664 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
665 {
666 struct ipv6_mreq mreq;
668 DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
670 memcpy (&mreq.ipv6mr_multiaddr,
671 &addr->sin6_addr,
672 sizeof (addr->sin6_addr));
674 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
675 * ipv6mr_interface may be set to zeroes to
676 * choose the default multicast interface or to
677 * the index of a particular multicast-capable
678 * interface if the host is multihomed.
679 * Membership is associ-associated with a
680 * single interface; programs running on
681 * multihomed hosts may need to join the same
682 * group on more than one interface.*/
683 mreq.ipv6mr_interface = 0;
685 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
686 &loop, sizeof (loop)) == -1)
687 {
688 char errbuf[1024];
689 ERROR ("setsockopt: %s",
690 sstrerror (errno, errbuf,
691 sizeof (errbuf)));
692 return (-1);
693 }
695 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
696 &mreq, sizeof (mreq)) == -1)
697 {
698 char errbuf[1024];
699 ERROR ("setsockopt: %s",
700 sstrerror (errno, errbuf,
701 sizeof (errbuf)));
702 return (-1);
703 }
704 }
705 }
707 return (0);
708 } /* int network_bind_socket */
710 static sockent_t *network_create_socket (const char *node,
711 const char *service,
712 int listen)
713 {
714 struct addrinfo ai_hints;
715 struct addrinfo *ai_list, *ai_ptr;
716 int ai_return;
718 sockent_t *se_head = NULL;
719 sockent_t *se_tail = NULL;
721 DEBUG ("node = %s, service = %s", node, service);
723 memset (&ai_hints, '\0', sizeof (ai_hints));
724 ai_hints.ai_flags = 0;
725 #ifdef AI_PASSIVE
726 ai_hints.ai_flags |= AI_PASSIVE;
727 #endif
728 #ifdef AI_ADDRCONFIG
729 ai_hints.ai_flags |= AI_ADDRCONFIG;
730 #endif
731 ai_hints.ai_family = AF_UNSPEC;
732 ai_hints.ai_socktype = SOCK_DGRAM;
733 ai_hints.ai_protocol = IPPROTO_UDP;
735 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
736 if (ai_return != 0)
737 {
738 char errbuf[1024];
739 ERROR ("getaddrinfo (%s, %s): %s",
740 (node == NULL) ? "(null)" : node,
741 (service == NULL) ? "(null)" : service,
742 (ai_return == EAI_SYSTEM)
743 ? sstrerror (errno, errbuf, sizeof (errbuf))
744 : gai_strerror (ai_return));
745 return (NULL);
746 }
748 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
749 {
750 sockent_t *se;
752 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
753 {
754 char errbuf[1024];
755 ERROR ("malloc: %s",
756 sstrerror (errno, errbuf,
757 sizeof (errbuf)));
758 continue;
759 }
761 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
762 {
763 char errbuf[1024];
764 ERROR ("malloc: %s",
765 sstrerror (errno, errbuf,
766 sizeof (errbuf)));
767 free (se);
768 continue;
769 }
771 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
772 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
773 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
774 se->addrlen = ai_ptr->ai_addrlen;
776 se->fd = socket (ai_ptr->ai_family,
777 ai_ptr->ai_socktype,
778 ai_ptr->ai_protocol);
779 se->next = NULL;
781 if (se->fd == -1)
782 {
783 char errbuf[1024];
784 ERROR ("socket: %s",
785 sstrerror (errno, errbuf,
786 sizeof (errbuf)));
787 free (se->addr);
788 free (se);
789 continue;
790 }
792 if (listen != 0)
793 {
794 if (network_bind_socket (se, ai_ptr) != 0)
795 {
796 close (se->fd);
797 free (se->addr);
798 free (se);
799 continue;
800 }
801 }
802 else /* listen == 0 */
803 {
804 network_set_ttl (se, ai_ptr);
805 }
807 if (se_tail == NULL)
808 {
809 se_head = se;
810 se_tail = se;
811 }
812 else
813 {
814 se_tail->next = se;
815 se_tail = se;
816 }
818 /* We don't open more than one write-socket per node/service pair.. */
819 if (listen == 0)
820 break;
821 }
823 freeaddrinfo (ai_list);
825 return (se_head);
826 } /* sockent_t *network_create_socket */
828 static sockent_t *network_create_default_socket (int listen)
829 {
830 sockent_t *se_ptr = NULL;
831 sockent_t *se_head = NULL;
832 sockent_t *se_tail = NULL;
834 se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
835 NET_DEFAULT_PORT, listen);
837 /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
838 if ((listen == 0) && (se_ptr != NULL))
839 return (se_ptr);
841 if (se_ptr != NULL)
842 {
843 se_head = se_ptr;
844 se_tail = se_ptr;
845 while (se_tail->next != NULL)
846 se_tail = se_tail->next;
847 }
849 se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
851 if (se_tail == NULL)
852 return (se_ptr);
854 se_tail->next = se_ptr;
855 return (se_head);
856 } /* sockent_t *network_create_default_socket */
858 static int network_add_listen_socket (const char *node, const char *service)
859 {
860 sockent_t *se;
861 sockent_t *se_ptr;
862 int se_num = 0;
864 if (service == NULL)
865 service = NET_DEFAULT_PORT;
867 if (node == NULL)
868 se = network_create_default_socket (1 /* listen == true */);
869 else
870 se = network_create_socket (node, service, 1 /* listen == true */);
872 if (se == NULL)
873 return (-1);
875 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
876 se_num++;
878 listen_sockets = (struct pollfd *) realloc (listen_sockets,
879 (listen_sockets_num + se_num)
880 * sizeof (struct pollfd));
882 for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
883 {
884 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
885 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
886 listen_sockets[listen_sockets_num].revents = 0;
887 listen_sockets_num++;
888 } /* for (se) */
890 free_sockent (se);
891 return (0);
892 } /* int network_add_listen_socket */
894 static int network_add_sending_socket (const char *node, const char *service)
895 {
896 sockent_t *se;
897 sockent_t *se_ptr;
899 if (service == NULL)
900 service = NET_DEFAULT_PORT;
902 if (node == NULL)
903 se = network_create_default_socket (0 /* listen == false */);
904 else
905 se = network_create_socket (node, service, 0 /* listen == false */);
907 if (se == NULL)
908 return (-1);
910 if (sending_sockets == NULL)
911 {
912 sending_sockets = se;
913 return (0);
914 }
916 for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
917 /* seek end */;
919 se_ptr->next = se;
920 return (0);
921 } /* int network_get_listen_socket */
923 int network_receive (void)
924 {
925 char buffer[BUFF_SIZE];
926 int buffer_len;
928 int i;
929 int status;
931 if (listen_sockets_num == 0)
932 network_add_listen_socket (NULL, NULL);
934 if (listen_sockets_num == 0)
935 {
936 ERROR ("network: Failed to open a listening socket.");
937 return (-1);
938 }
940 while (listen_loop == 0)
941 {
942 status = poll (listen_sockets, listen_sockets_num, -1);
944 if (status <= 0)
945 {
946 char errbuf[1024];
947 if (errno == EINTR)
948 continue;
949 ERROR ("poll failed: %s",
950 sstrerror (errno, errbuf, sizeof (errbuf)));
951 return (-1);
952 }
954 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
955 {
956 if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
957 continue;
958 status--;
960 buffer_len = recv (listen_sockets[i].fd,
961 buffer, sizeof (buffer),
962 0 /* no flags */);
963 if (buffer_len < 0)
964 {
965 char errbuf[1024];
966 ERROR ("recv failed: %s",
967 sstrerror (errno, errbuf,
968 sizeof (errbuf)));
969 return (-1);
970 }
972 parse_packet (buffer, buffer_len);
973 } /* for (listen_sockets) */
974 } /* while (listen_loop == 0) */
976 return (0);
977 }
979 static void *receive_thread (void *arg)
980 {
981 return (network_receive () ? (void *) 1 : (void *) 0);
982 } /* void *receive_thread */
984 static void network_send_buffer (const char *buffer, int buffer_len)
985 {
986 sockent_t *se;
987 int status;
989 DEBUG ("buffer_len = %i", buffer_len);
991 for (se = sending_sockets; se != NULL; se = se->next)
992 {
993 while (42)
994 {
995 status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
996 (struct sockaddr *) se->addr, se->addrlen);
997 if (status < 0)
998 {
999 char errbuf[1024];
1000 if (errno == EINTR)
1001 continue;
1002 ERROR ("network plugin: sendto failed: %s",
1003 sstrerror (errno, errbuf,
1004 sizeof (errbuf)));
1005 break;
1006 }
1008 break;
1009 } /* while (42) */
1010 } /* for (sending_sockets) */
1011 } /* void network_send_buffer */
1013 static int add_to_buffer (char *buffer, int buffer_size,
1014 value_list_t *vl_def, char *type_def,
1015 const data_set_t *ds, const value_list_t *vl)
1016 {
1017 char *buffer_orig = buffer;
1019 if (strcmp (vl_def->host, vl->host) != 0)
1020 {
1021 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1022 vl->host, strlen (vl->host)) != 0)
1023 return (-1);
1024 strcpy (vl_def->host, vl->host);
1025 DEBUG ("network plugin: add_to_buffer: host = %s", vl->host);
1026 }
1028 if (vl_def->time != vl->time)
1029 {
1030 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1031 (uint64_t) vl->time))
1032 return (-1);
1033 vl_def->time = vl->time;
1034 DEBUG ("network plugin: add_to_buffer: time = %u",
1035 (unsigned int) vl->time);
1036 }
1038 if (strcmp (vl_def->plugin, vl->plugin) != 0)
1039 {
1040 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1041 vl->plugin, strlen (vl->plugin)) != 0)
1042 return (-1);
1043 strcpy (vl_def->plugin, vl->plugin);
1044 DEBUG ("network plugin: add_to_buffer: plugin = %s",
1045 vl->plugin);
1046 }
1048 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1049 {
1050 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1051 vl->plugin_instance,
1052 strlen (vl->plugin_instance)) != 0)
1053 return (-1);
1054 strcpy (vl_def->plugin_instance, vl->plugin_instance);
1055 DEBUG ("network plugin: add_to_buffer: plugin_instance = %s",
1056 vl->plugin_instance);
1057 }
1059 if (strcmp (type_def, ds->type) != 0)
1060 {
1061 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1062 ds->type, strlen (ds->type)) != 0)
1063 return (-1);
1064 strcpy (type_def, ds->type);
1065 DEBUG ("network plugin: add_to_buffer: type = %s", ds->type);
1066 }
1068 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1069 {
1070 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1071 vl->type_instance,
1072 strlen (vl->type_instance)) != 0)
1073 return (-1);
1074 strcpy (vl_def->type_instance, vl->type_instance);
1075 DEBUG ("network plugin: add_to_buffer: type_instance = %s",
1076 vl->type_instance);
1077 }
1079 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1080 return (-1);
1082 return (buffer - buffer_orig);
1083 } /* int add_to_buffer */
1085 static void flush_buffer (void)
1086 {
1087 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1088 send_buffer_fill);
1090 network_send_buffer (send_buffer, send_buffer_fill);
1091 send_buffer_ptr = send_buffer;
1092 send_buffer_fill = 0;
1093 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1094 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1095 }
1097 static int network_write (const data_set_t *ds, const value_list_t *vl)
1098 {
1099 int status;
1101 /* If the value is already in the cache, we have received it via the
1102 * network. We write it again if forwarding is activated. It's then in
1103 * the cache and should we receive it again we will ignore it. */
1104 status = cache_check (ds->type, vl);
1105 if ((network_config_forward == 0)
1106 && (status != 0))
1107 return (0);
1109 pthread_mutex_lock (&send_buffer_lock);
1111 status = add_to_buffer (send_buffer_ptr,
1112 sizeof (send_buffer) - send_buffer_fill,
1113 &send_buffer_vl, send_buffer_type,
1114 ds, vl);
1115 if (status >= 0)
1116 {
1117 /* status == bytes added to the buffer */
1118 send_buffer_fill += status;
1119 send_buffer_ptr += status;
1120 }
1121 else
1122 {
1123 flush_buffer ();
1125 status = add_to_buffer (send_buffer_ptr,
1126 sizeof (send_buffer) - send_buffer_fill,
1127 &send_buffer_vl, send_buffer_type,
1128 ds, vl);
1130 if (status >= 0)
1131 {
1132 send_buffer_fill += status;
1133 send_buffer_ptr += status;
1134 }
1135 }
1137 if (status < 0)
1138 {
1139 ERROR ("network plugin: Unable to append to the "
1140 "buffer for some weird reason");
1141 }
1142 else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1143 {
1144 flush_buffer ();
1145 }
1147 pthread_mutex_unlock (&send_buffer_lock);
1149 return ((status < 0) ? -1 : 0);
1150 } /* int network_write */
1152 static int network_config (const char *key, const char *val)
1153 {
1154 char *node;
1155 char *service;
1157 char *fields[3];
1158 int fields_num;
1160 if ((strcasecmp ("Listen", key) == 0)
1161 || (strcasecmp ("Server", key) == 0))
1162 {
1163 char *val_cpy = strdup (val);
1164 if (val_cpy == NULL)
1165 return (1);
1167 service = NET_DEFAULT_PORT;
1168 fields_num = strsplit (val_cpy, fields, 3);
1169 if ((fields_num != 1)
1170 && (fields_num != 2))
1171 return (1);
1172 else if (fields_num == 2)
1173 service = fields[1];
1174 node = fields[0];
1176 if (strcasecmp ("Listen", key) == 0)
1177 network_add_listen_socket (node, service);
1178 else
1179 network_add_sending_socket (node, service);
1180 }
1181 else if (strcasecmp ("TimeToLive", key) == 0)
1182 {
1183 int tmp = atoi (val);
1184 if ((tmp > 0) && (tmp < 256))
1185 network_config_ttl = tmp;
1186 else
1187 return (1);
1188 }
1189 else if (strcasecmp ("Forward", key) == 0)
1190 {
1191 if ((strcasecmp ("true", val) == 0)
1192 || (strcasecmp ("yes", val) == 0)
1193 || (strcasecmp ("on", val) == 0))
1194 network_config_forward = 1;
1195 else
1196 network_config_forward = 0;
1197 }
1198 else
1199 {
1200 return (-1);
1201 }
1202 return (0);
1203 }
1205 static int network_shutdown (void)
1206 {
1207 DEBUG ("Shutting down.");
1209 listen_loop++;
1211 if (listen_thread != (pthread_t) 0)
1212 {
1213 pthread_kill (listen_thread, SIGTERM);
1214 pthread_join (listen_thread, NULL /* no return value */);
1215 listen_thread = (pthread_t) 0;
1216 }
1218 listen_thread = 0;
1220 if (cache_tree != NULL)
1221 {
1222 void *key;
1223 void *value;
1225 while (avl_pick (cache_tree, &key, &value) == 0)
1226 {
1227 sfree (key);
1228 sfree (value);
1229 }
1230 avl_destroy (cache_tree);
1231 cache_tree = NULL;
1232 }
1234 /* TODO: Close `sending_sockets' */
1236 plugin_unregister_config ("network");
1237 plugin_unregister_init ("network");
1238 plugin_unregister_write ("network");
1239 plugin_unregister_shutdown ("network");
1241 return (0);
1242 } /* int network_shutdown */
1244 static int network_init (void)
1245 {
1246 plugin_register_shutdown ("network", network_shutdown);
1248 send_buffer_ptr = send_buffer;
1249 send_buffer_fill = 0;
1250 memset (&send_buffer_vl, '\0', sizeof (send_buffer_vl));
1251 memset (send_buffer_type, '\0', sizeof (send_buffer_type));
1253 cache_tree = avl_create ((int (*) (const void *, const void *)) strcmp);
1255 /* setup socket(s) and so on */
1256 if (sending_sockets != NULL)
1257 plugin_register_write ("network", network_write);
1259 if ((listen_sockets_num != 0) && (listen_thread == 0))
1260 {
1261 int status;
1263 status = pthread_create (&listen_thread, NULL /* no attributes */,
1264 receive_thread, NULL /* no argument */);
1266 if (status != 0)
1267 {
1268 char errbuf[1024];
1269 ERROR ("network: pthread_create failed: %s",
1270 sstrerror (errno, errbuf,
1271 sizeof (errbuf)));
1272 }
1273 }
1274 return (0);
1275 } /* int network_init */
1277 void module_register (void)
1278 {
1279 plugin_register_config ("network", network_config,
1280 config_keys, config_keys_num);
1281 plugin_register_init ("network", network_init);
1282 }