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1 /**
2 * collectd - src/network.c
3 * Copyright (C) 2005-2009 Florian octo Forster
4 * Copyright (C) 2009 Aman Gupta
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation; only version 2.1 of the License is
9 * applicable.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Florian octo Forster <octo at verplant.org>
22 * Aman Gupta <aman at tmm1.net>
23 **/
25 #define _BSD_SOURCE /* For struct ip_mreq */
27 #include "collectd.h"
28 #include "plugin.h"
29 #include "common.h"
30 #include "configfile.h"
31 #include "utils_fbhash.h"
32 #include "utils_avltree.h"
33 #include "utils_cache.h"
35 #include "network.h"
37 #if HAVE_PTHREAD_H
38 # include <pthread.h>
39 #endif
40 #if HAVE_SYS_SOCKET_H
41 # include <sys/socket.h>
42 #endif
43 #if HAVE_NETDB_H
44 # include <netdb.h>
45 #endif
46 #if HAVE_NETINET_IN_H
47 # include <netinet/in.h>
48 #endif
49 #if HAVE_ARPA_INET_H
50 # include <arpa/inet.h>
51 #endif
52 #if HAVE_POLL_H
53 # include <poll.h>
54 #endif
55 #if HAVE_NET_IF_H
56 # include <net/if.h>
57 #endif
59 #if HAVE_LIBGCRYPT
60 # include <gcrypt.h>
61 GCRY_THREAD_OPTION_PTHREAD_IMPL;
62 #endif
64 #ifndef IPV6_ADD_MEMBERSHIP
65 # ifdef IPV6_JOIN_GROUP
66 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
67 # else
68 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
69 # endif
70 #endif /* !IP_ADD_MEMBERSHIP */
72 /*
73 * Maximum size required for encryption / signing:
74 *
75 * 42 bytes for the encryption header
76 * + 64 bytes for the username
77 * -----------
78 * = 106 bytes
79 */
80 #define BUFF_SIG_SIZE 106
82 /*
83 * Private data types
84 */
85 #define SECURITY_LEVEL_NONE 0
86 #if HAVE_LIBGCRYPT
87 # define SECURITY_LEVEL_SIGN 1
88 # define SECURITY_LEVEL_ENCRYPT 2
89 #endif
90 struct sockent_client
91 {
92 int fd;
93 struct sockaddr_storage *addr;
94 socklen_t addrlen;
95 #if HAVE_LIBGCRYPT
96 int security_level;
97 char *username;
98 char *password;
99 gcry_cipher_hd_t cypher;
100 unsigned char password_hash[32];
101 #endif
102 };
104 struct sockent_server
105 {
106 int *fd;
107 size_t fd_num;
108 #if HAVE_LIBGCRYPT
109 int security_level;
110 char *auth_file;
111 fbhash_t *userdb;
112 gcry_cipher_hd_t cypher;
113 #endif
114 };
116 typedef struct sockent
117 {
118 #define SOCKENT_TYPE_CLIENT 1
119 #define SOCKENT_TYPE_SERVER 2
120 int type;
122 char *node;
123 char *service;
124 int interface;
126 union
127 {
128 struct sockent_client client;
129 struct sockent_server server;
130 } data;
132 struct sockent *next;
133 } sockent_t;
135 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
136 * 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
137 * +-------+-----------------------+-------------------------------+
138 * ! Ver. ! ! Length !
139 * +-------+-----------------------+-------------------------------+
140 */
141 struct part_header_s
142 {
143 uint16_t type;
144 uint16_t length;
145 };
146 typedef struct part_header_s part_header_t;
148 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
149 * 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
150 * +-------------------------------+-------------------------------+
151 * ! Type ! Length !
152 * +-------------------------------+-------------------------------+
153 * : (Length - 4) Bytes :
154 * +---------------------------------------------------------------+
155 */
156 struct part_string_s
157 {
158 part_header_t *head;
159 char *value;
160 };
161 typedef struct part_string_s part_string_t;
163 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
164 * 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
165 * +-------------------------------+-------------------------------+
166 * ! Type ! Length !
167 * +-------------------------------+-------------------------------+
168 * : (Length - 4 == 2 || 4 || 8) Bytes :
169 * +---------------------------------------------------------------+
170 */
171 struct part_number_s
172 {
173 part_header_t *head;
174 uint64_t *value;
175 };
176 typedef struct part_number_s part_number_t;
178 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
179 * 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
180 * +-------------------------------+-------------------------------+
181 * ! Type ! Length !
182 * +-------------------------------+---------------+---------------+
183 * ! Num of values ! Type0 ! Type1 !
184 * +-------------------------------+---------------+---------------+
185 * ! Value0 !
186 * ! !
187 * +---------------------------------------------------------------+
188 * ! Value1 !
189 * ! !
190 * +---------------------------------------------------------------+
191 */
192 struct part_values_s
193 {
194 part_header_t *head;
195 uint16_t *num_values;
196 uint8_t *values_types;
197 value_t *values;
198 };
199 typedef struct part_values_s part_values_t;
201 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
202 * 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
203 * +-------------------------------+-------------------------------+
204 * ! Type ! Length !
205 * +-------------------------------+-------------------------------+
206 * ! Hash (Bits 0 - 31) !
207 * : : :
208 * ! Hash (Bits 224 - 255) !
209 * +---------------------------------------------------------------+
210 */
211 /* Minimum size */
212 #define PART_SIGNATURE_SHA256_SIZE 36
213 struct part_signature_sha256_s
214 {
215 part_header_t head;
216 unsigned char hash[32];
217 char *username;
218 };
219 typedef struct part_signature_sha256_s part_signature_sha256_t;
221 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
222 * 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
223 * +-------------------------------+-------------------------------+
224 * ! Type ! Length !
225 * +-------------------------------+-------------------------------+
226 * ! Original length ! Padding (0 - 15 bytes) !
227 * +-------------------------------+-------------------------------+
228 * ! Hash (Bits 0 - 31) !
229 * : : :
230 * ! Hash (Bits 128 - 159) !
231 * +---------------------------------------------------------------+
232 */
233 /* Minimum size */
234 #define PART_ENCRYPTION_AES256_SIZE 42
235 struct part_encryption_aes256_s
236 {
237 part_header_t head;
238 uint16_t username_length;
239 char *username;
240 unsigned char iv[16];
241 /* <encrypted> */
242 unsigned char hash[20];
243 /* <payload /> */
244 /* </encrypted> */
245 };
246 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
248 struct receive_list_entry_s
249 {
250 char *data;
251 int data_len;
252 int fd;
253 struct receive_list_entry_s *next;
254 };
255 typedef struct receive_list_entry_s receive_list_entry_t;
257 /*
258 * Private variables
259 */
260 static int network_config_ttl = 0;
261 static size_t network_config_packet_size = 1024;
262 static int network_config_forward = 0;
263 static int network_config_stats = 0;
265 static sockent_t *sending_sockets = NULL;
267 static receive_list_entry_t *receive_list_head = NULL;
268 static receive_list_entry_t *receive_list_tail = NULL;
269 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
270 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
271 static uint64_t receive_list_length = 0;
273 static sockent_t *listen_sockets = NULL;
274 static struct pollfd *listen_sockets_pollfd = NULL;
275 static size_t listen_sockets_num = 0;
277 /* The receive and dispatch threads will run as long as `listen_loop' is set to
278 * zero. */
279 static int listen_loop = 0;
280 static int receive_thread_running = 0;
281 static pthread_t receive_thread_id;
282 static int dispatch_thread_running = 0;
283 static pthread_t dispatch_thread_id;
285 /* Buffer in which to-be-sent network packets are constructed. */
286 static char *send_buffer;
287 static char *send_buffer_ptr;
288 static int send_buffer_fill;
289 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
290 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
292 /* XXX: These counters are incremented from one place only. The spot in which
293 * the values are incremented is either only reachable by one thread (the
294 * dispatch thread, for example) or locked by some lock (send_buffer_lock for
295 * example). Only if neither is true, the stats_lock is acquired. The counters
296 * are always read without holding a lock in the hope that writing 8 bytes to
297 * memory is an atomic operation. */
298 static uint64_t stats_octets_rx = 0;
299 static uint64_t stats_octets_tx = 0;
300 static uint64_t stats_packets_rx = 0;
301 static uint64_t stats_packets_tx = 0;
302 static uint64_t stats_values_dispatched = 0;
303 static uint64_t stats_values_not_dispatched = 0;
304 static uint64_t stats_values_sent = 0;
305 static uint64_t stats_values_not_sent = 0;
306 static pthread_mutex_t stats_lock = PTHREAD_MUTEX_INITIALIZER;
308 /*
309 * Private functions
310 */
311 static _Bool check_receive_okay (const value_list_t *vl) /* {{{ */
312 {
313 uint64_t time_sent = 0;
314 int status;
316 status = uc_meta_data_get_unsigned_int (vl,
317 "network:time_sent", &time_sent);
319 /* This is a value we already sent. Don't allow it to be received again in
320 * order to avoid looping. */
321 if ((status == 0) && (time_sent >= ((uint64_t) vl->time)))
322 return (false);
324 return (true);
325 } /* }}} _Bool check_receive_okay */
327 static _Bool check_send_okay (const value_list_t *vl) /* {{{ */
328 {
329 _Bool received = false;
330 int status;
332 if (network_config_forward != 0)
333 return (true);
335 if (vl->meta == NULL)
336 return (true);
338 status = meta_data_get_boolean (vl->meta, "network:received", &received);
339 if (status == -ENOENT)
340 return (true);
341 else if (status != 0)
342 {
343 ERROR ("network plugin: check_send_okay: meta_data_get_boolean failed "
344 "with status %i.", status);
345 return (true);
346 }
348 /* By default, only *send* value lists that were not *received* by the
349 * network plugin. */
350 return (!received);
351 } /* }}} _Bool check_send_okay */
353 static int network_dispatch_values (value_list_t *vl) /* {{{ */
354 {
355 int status;
357 if ((vl->time <= 0)
358 || (strlen (vl->host) <= 0)
359 || (strlen (vl->plugin) <= 0)
360 || (strlen (vl->type) <= 0))
361 return (-EINVAL);
363 if (!check_receive_okay (vl))
364 {
365 #if COLLECT_DEBUG
366 char name[6*DATA_MAX_NAME_LEN];
367 FORMAT_VL (name, sizeof (name), vl);
368 name[sizeof (name) - 1] = 0;
369 DEBUG ("network plugin: network_dispatch_values: "
370 "NOT dispatching %s.", name);
371 #endif
372 stats_values_not_dispatched++;
373 return (0);
374 }
376 assert (vl->meta == NULL);
378 vl->meta = meta_data_create ();
379 if (vl->meta == NULL)
380 {
381 ERROR ("network plugin: meta_data_create failed.");
382 return (-ENOMEM);
383 }
385 status = meta_data_add_boolean (vl->meta, "network:received", true);
386 if (status != 0)
387 {
388 ERROR ("network plugin: meta_data_add_boolean failed.");
389 meta_data_destroy (vl->meta);
390 vl->meta = NULL;
391 return (status);
392 }
394 plugin_dispatch_values (vl);
395 stats_values_dispatched++;
397 meta_data_destroy (vl->meta);
398 vl->meta = NULL;
400 return (0);
401 } /* }}} int network_dispatch_values */
403 #if HAVE_LIBGCRYPT
404 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
405 const void *iv, size_t iv_size, const char *username)
406 {
407 gcry_error_t err;
408 gcry_cipher_hd_t *cyper_ptr;
409 unsigned char password_hash[32];
411 if (se->type == SOCKENT_TYPE_CLIENT)
412 {
413 cyper_ptr = &se->data.client.cypher;
414 memcpy (password_hash, se->data.client.password_hash,
415 sizeof (password_hash));
416 }
417 else
418 {
419 char *secret;
421 cyper_ptr = &se->data.server.cypher;
423 if (username == NULL)
424 return (NULL);
426 secret = fbh_get (se->data.server.userdb, username);
427 if (secret == NULL)
428 return (NULL);
430 gcry_md_hash_buffer (GCRY_MD_SHA256,
431 password_hash,
432 secret, strlen (secret));
434 sfree (secret);
435 }
437 if (*cyper_ptr == NULL)
438 {
439 err = gcry_cipher_open (cyper_ptr,
440 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0);
441 if (err != 0)
442 {
443 ERROR ("network plugin: gcry_cipher_open returned: %s",
444 gcry_strerror (err));
445 *cyper_ptr = NULL;
446 return (NULL);
447 }
448 }
449 else
450 {
451 gcry_cipher_reset (*cyper_ptr);
452 }
453 assert (*cyper_ptr != NULL);
455 err = gcry_cipher_setkey (*cyper_ptr,
456 password_hash, sizeof (password_hash));
457 if (err != 0)
458 {
459 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
460 gcry_strerror (err));
461 gcry_cipher_close (*cyper_ptr);
462 *cyper_ptr = NULL;
463 return (NULL);
464 }
466 err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size);
467 if (err != 0)
468 {
469 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
470 gcry_strerror (err));
471 gcry_cipher_close (*cyper_ptr);
472 *cyper_ptr = NULL;
473 return (NULL);
474 }
476 return (*cyper_ptr);
477 } /* }}} int network_get_aes256_cypher */
478 #endif /* HAVE_LIBGCRYPT */
480 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
481 const data_set_t *ds, const value_list_t *vl)
482 {
483 char *packet_ptr;
484 int packet_len;
485 int num_values;
487 part_header_t pkg_ph;
488 uint16_t pkg_num_values;
489 uint8_t *pkg_values_types;
490 value_t *pkg_values;
492 int offset;
493 int i;
495 num_values = vl->values_len;
496 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
497 + (num_values * sizeof (uint8_t))
498 + (num_values * sizeof (value_t));
500 if (*ret_buffer_len < packet_len)
501 return (-1);
503 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
504 if (pkg_values_types == NULL)
505 {
506 ERROR ("network plugin: write_part_values: malloc failed.");
507 return (-1);
508 }
510 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
511 if (pkg_values == NULL)
512 {
513 free (pkg_values_types);
514 ERROR ("network plugin: write_part_values: malloc failed.");
515 return (-1);
516 }
518 pkg_ph.type = htons (TYPE_VALUES);
519 pkg_ph.length = htons (packet_len);
521 pkg_num_values = htons ((uint16_t) vl->values_len);
523 for (i = 0; i < num_values; i++)
524 {
525 pkg_values_types[i] = (uint8_t) ds->ds[i].type;
526 switch (ds->ds[i].type)
527 {
528 case DS_TYPE_COUNTER:
529 pkg_values[i].counter = htonll (vl->values[i].counter);
530 break;
532 case DS_TYPE_GAUGE:
533 pkg_values[i].gauge = htond (vl->values[i].gauge);
534 break;
536 case DS_TYPE_DERIVE:
537 pkg_values[i].derive = htonll (vl->values[i].derive);
538 break;
540 case DS_TYPE_ABSOLUTE:
541 pkg_values[i].absolute = htonll (vl->values[i].absolute);
542 break;
544 default:
545 free (pkg_values_types);
546 free (pkg_values);
547 ERROR ("network plugin: write_part_values: "
548 "Unknown data source type: %i",
549 ds->ds[i].type);
550 return (-1);
551 } /* switch (ds->ds[i].type) */
552 } /* for (num_values) */
554 /*
555 * Use `memcpy' to write everything to the buffer, because the pointer
556 * may be unaligned and some architectures, such as SPARC, can't handle
557 * that.
558 */
559 packet_ptr = *ret_buffer;
560 offset = 0;
561 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
562 offset += sizeof (pkg_ph);
563 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
564 offset += sizeof (pkg_num_values);
565 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
566 offset += num_values * sizeof (uint8_t);
567 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
568 offset += num_values * sizeof (value_t);
570 assert (offset == packet_len);
572 *ret_buffer = packet_ptr + packet_len;
573 *ret_buffer_len -= packet_len;
575 free (pkg_values_types);
576 free (pkg_values);
578 return (0);
579 } /* int write_part_values */
581 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
582 int type, uint64_t value)
583 {
584 char *packet_ptr;
585 int packet_len;
587 part_header_t pkg_head;
588 uint64_t pkg_value;
590 int offset;
592 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
594 if (*ret_buffer_len < packet_len)
595 return (-1);
597 pkg_head.type = htons (type);
598 pkg_head.length = htons (packet_len);
599 pkg_value = htonll (value);
601 packet_ptr = *ret_buffer;
602 offset = 0;
603 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
604 offset += sizeof (pkg_head);
605 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
606 offset += sizeof (pkg_value);
608 assert (offset == packet_len);
610 *ret_buffer = packet_ptr + packet_len;
611 *ret_buffer_len -= packet_len;
613 return (0);
614 } /* int write_part_number */
616 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
617 int type, const char *str, int str_len)
618 {
619 char *buffer;
620 int buffer_len;
622 uint16_t pkg_type;
623 uint16_t pkg_length;
625 int offset;
627 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
628 if (*ret_buffer_len < buffer_len)
629 return (-1);
631 pkg_type = htons (type);
632 pkg_length = htons (buffer_len);
634 buffer = *ret_buffer;
635 offset = 0;
636 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
637 offset += sizeof (pkg_type);
638 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
639 offset += sizeof (pkg_length);
640 memcpy (buffer + offset, str, str_len);
641 offset += str_len;
642 memset (buffer + offset, '\0', 1);
643 offset += 1;
645 assert (offset == buffer_len);
647 *ret_buffer = buffer + buffer_len;
648 *ret_buffer_len -= buffer_len;
650 return (0);
651 } /* int write_part_string */
653 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
654 value_t **ret_values, int *ret_num_values)
655 {
656 char *buffer = *ret_buffer;
657 size_t buffer_len = *ret_buffer_len;
659 uint16_t tmp16;
660 size_t exp_size;
661 int i;
663 uint16_t pkg_length;
664 uint16_t pkg_type;
665 uint16_t pkg_numval;
667 uint8_t *pkg_types;
668 value_t *pkg_values;
670 if (buffer_len < 15)
671 {
672 NOTICE ("network plugin: packet is too short: "
673 "buffer_len = %zu", buffer_len);
674 return (-1);
675 }
677 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
678 buffer += sizeof (tmp16);
679 pkg_type = ntohs (tmp16);
681 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
682 buffer += sizeof (tmp16);
683 pkg_length = ntohs (tmp16);
685 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
686 buffer += sizeof (tmp16);
687 pkg_numval = ntohs (tmp16);
689 assert (pkg_type == TYPE_VALUES);
691 exp_size = 3 * sizeof (uint16_t)
692 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
693 if ((buffer_len < 0) || (buffer_len < exp_size))
694 {
695 WARNING ("network plugin: parse_part_values: "
696 "Packet too short: "
697 "Chunk of size %zu expected, "
698 "but buffer has only %zu bytes left.",
699 exp_size, buffer_len);
700 return (-1);
701 }
703 if (pkg_length != exp_size)
704 {
705 WARNING ("network plugin: parse_part_values: "
706 "Length and number of values "
707 "in the packet don't match.");
708 return (-1);
709 }
711 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
712 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
713 if ((pkg_types == NULL) || (pkg_values == NULL))
714 {
715 sfree (pkg_types);
716 sfree (pkg_values);
717 ERROR ("network plugin: parse_part_values: malloc failed.");
718 return (-1);
719 }
721 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
722 buffer += pkg_numval * sizeof (uint8_t);
723 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
724 buffer += pkg_numval * sizeof (value_t);
726 for (i = 0; i < pkg_numval; i++)
727 {
728 switch (pkg_types[i])
729 {
730 case DS_TYPE_COUNTER:
731 pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter);
732 break;
734 case DS_TYPE_GAUGE:
735 pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge);
736 break;
738 case DS_TYPE_DERIVE:
739 pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive);
740 break;
742 case DS_TYPE_ABSOLUTE:
743 pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute);
744 break;
746 default:
747 sfree (pkg_types);
748 sfree (pkg_values);
749 NOTICE ("network plugin: parse_part_values: "
750 "Don't know how to handle data source type %"PRIu8,
751 pkg_types[i]);
752 return (-1);
753 } /* switch (pkg_types[i]) */
754 }
756 *ret_buffer = buffer;
757 *ret_buffer_len = buffer_len - pkg_length;
758 *ret_num_values = pkg_numval;
759 *ret_values = pkg_values;
761 sfree (pkg_types);
763 return (0);
764 } /* int parse_part_values */
766 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
767 uint64_t *value)
768 {
769 char *buffer = *ret_buffer;
770 size_t buffer_len = *ret_buffer_len;
772 uint16_t tmp16;
773 uint64_t tmp64;
774 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
776 uint16_t pkg_length;
777 uint16_t pkg_type;
779 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
780 {
781 WARNING ("network plugin: parse_part_number: "
782 "Packet too short: "
783 "Chunk of size %zu expected, "
784 "but buffer has only %zu bytes left.",
785 exp_size, buffer_len);
786 return (-1);
787 }
789 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
790 buffer += sizeof (tmp16);
791 pkg_type = ntohs (tmp16);
793 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
794 buffer += sizeof (tmp16);
795 pkg_length = ntohs (tmp16);
797 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
798 buffer += sizeof (tmp64);
799 *value = ntohll (tmp64);
801 *ret_buffer = buffer;
802 *ret_buffer_len = buffer_len - pkg_length;
804 return (0);
805 } /* int parse_part_number */
807 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
808 char *output, int output_len)
809 {
810 char *buffer = *ret_buffer;
811 size_t buffer_len = *ret_buffer_len;
813 uint16_t tmp16;
814 size_t header_size = 2 * sizeof (uint16_t);
816 uint16_t pkg_length;
817 uint16_t pkg_type;
819 if ((buffer_len < 0) || (buffer_len < header_size))
820 {
821 WARNING ("network plugin: parse_part_string: "
822 "Packet too short: "
823 "Chunk of at least size %zu expected, "
824 "but buffer has only %zu bytes left.",
825 header_size, buffer_len);
826 return (-1);
827 }
829 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
830 buffer += sizeof (tmp16);
831 pkg_type = ntohs (tmp16);
833 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
834 buffer += sizeof (tmp16);
835 pkg_length = ntohs (tmp16);
837 /* Check that packet fits in the input buffer */
838 if (pkg_length > buffer_len)
839 {
840 WARNING ("network plugin: parse_part_string: "
841 "Packet too big: "
842 "Chunk of size %"PRIu16" received, "
843 "but buffer has only %zu bytes left.",
844 pkg_length, buffer_len);
845 return (-1);
846 }
848 /* Check that pkg_length is in the valid range */
849 if (pkg_length <= header_size)
850 {
851 WARNING ("network plugin: parse_part_string: "
852 "Packet too short: "
853 "Header claims this packet is only %hu "
854 "bytes long.", pkg_length);
855 return (-1);
856 }
858 /* Check that the package data fits into the output buffer.
859 * The previous if-statement ensures that:
860 * `pkg_length > header_size' */
861 if ((output_len < 0)
862 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
863 {
864 WARNING ("network plugin: parse_part_string: "
865 "Output buffer too small.");
866 return (-1);
867 }
869 /* All sanity checks successfull, let's copy the data over */
870 output_len = pkg_length - header_size;
871 memcpy ((void *) output, (void *) buffer, output_len);
872 buffer += output_len;
874 /* For some very weird reason '\0' doesn't do the trick on SPARC in
875 * this statement. */
876 if (output[output_len - 1] != 0)
877 {
878 WARNING ("network plugin: parse_part_string: "
879 "Received string does not end "
880 "with a NULL-byte.");
881 return (-1);
882 }
884 *ret_buffer = buffer;
885 *ret_buffer_len = buffer_len - pkg_length;
887 return (0);
888 } /* int parse_part_string */
890 /* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call
891 * parse_packet and vice versa. */
892 #define PP_SIGNED 0x01
893 #define PP_ENCRYPTED 0x02
894 static int parse_packet (sockent_t *se,
895 void *buffer, size_t buffer_size, int flags);
897 #define BUFFER_READ(p,s) do { \
898 memcpy ((p), buffer + buffer_offset, (s)); \
899 buffer_offset += (s); \
900 } while (0)
902 #if HAVE_LIBGCRYPT
903 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
904 void **ret_buffer, size_t *ret_buffer_len, int flags)
905 {
906 char *buffer;
907 size_t buffer_len;
908 size_t buffer_offset;
910 size_t username_len;
911 char *secret;
913 part_signature_sha256_t pss;
914 uint16_t pss_head_length;
915 char hash[sizeof (pss.hash)];
917 gcry_md_hd_t hd;
918 gcry_error_t err;
919 unsigned char *hash_ptr;
921 buffer = *ret_buffer;
922 buffer_len = *ret_buffer_len;
923 buffer_offset = 0;
925 if (se->data.server.userdb == NULL)
926 {
927 NOTICE ("network plugin: Received signed network packet but can't verify "
928 "it because no user DB has been configured. Will accept it.");
929 return (0);
930 }
932 /* Check if the buffer has enough data for this structure. */
933 if (buffer_len <= PART_SIGNATURE_SHA256_SIZE)
934 return (-ENOMEM);
936 /* Read type and length header */
937 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
938 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
939 pss_head_length = ntohs (pss.head.length);
941 /* Check if the `pss_head_length' is within bounds. */
942 if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE)
943 || (pss_head_length > buffer_len))
944 {
945 ERROR ("network plugin: HMAC-SHA-256 with invalid length received.");
946 return (-1);
947 }
949 /* Copy the hash. */
950 BUFFER_READ (pss.hash, sizeof (pss.hash));
952 /* Calculate username length (without null byte) and allocate memory */
953 username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE;
954 pss.username = malloc (username_len + 1);
955 if (pss.username == NULL)
956 return (-ENOMEM);
958 /* Read the username */
959 BUFFER_READ (pss.username, username_len);
960 pss.username[username_len] = 0;
962 assert (buffer_offset == pss_head_length);
964 /* Query the password */
965 secret = fbh_get (se->data.server.userdb, pss.username);
966 if (secret == NULL)
967 {
968 ERROR ("network plugin: Unknown user: %s", pss.username);
969 sfree (pss.username);
970 return (-ENOENT);
971 }
973 /* Create a hash device and check the HMAC */
974 hd = NULL;
975 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
976 if (err != 0)
977 {
978 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
979 gcry_strerror (err));
980 sfree (secret);
981 sfree (pss.username);
982 return (-1);
983 }
985 err = gcry_md_setkey (hd, secret, strlen (secret));
986 if (err != 0)
987 {
988 ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err));
989 gcry_md_close (hd);
990 return (-1);
991 }
993 gcry_md_write (hd,
994 buffer + PART_SIGNATURE_SHA256_SIZE,
995 buffer_len - PART_SIGNATURE_SHA256_SIZE);
996 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
997 if (hash_ptr == NULL)
998 {
999 ERROR ("network plugin: gcry_md_read failed.");
1000 gcry_md_close (hd);
1001 sfree (secret);
1002 sfree (pss.username);
1003 return (-1);
1004 }
1005 memcpy (hash, hash_ptr, sizeof (hash));
1007 /* Clean up */
1008 gcry_md_close (hd);
1009 hd = NULL;
1011 sfree (secret);
1012 sfree (pss.username);
1014 if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0)
1015 {
1016 WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: "
1017 "Hash mismatch.");
1018 }
1019 else
1020 {
1021 parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset,
1022 flags | PP_SIGNED);
1023 }
1025 *ret_buffer = buffer + buffer_len;
1026 *ret_buffer_len = 0;
1028 return (0);
1029 } /* }}} int parse_part_sign_sha256 */
1030 /* #endif HAVE_LIBGCRYPT */
1032 #else /* if !HAVE_LIBGCRYPT */
1033 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1034 void **ret_buffer, size_t *ret_buffer_size, int flags)
1035 {
1036 static int warning_has_been_printed = 0;
1038 char *buffer;
1039 size_t buffer_size;
1040 size_t buffer_offset;
1041 uint16_t part_len;
1043 part_signature_sha256_t pss;
1045 buffer = *ret_buffer;
1046 buffer_size = *ret_buffer_size;
1047 buffer_offset = 0;
1049 if (buffer_size <= PART_SIGNATURE_SHA256_SIZE)
1050 return (-ENOMEM);
1052 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1053 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1054 part_len = ntohs (pss.head.length);
1056 if ((part_len <= PART_SIGNATURE_SHA256_SIZE)
1057 || (part_len > buffer_size))
1058 return (-EINVAL);
1060 if (warning_has_been_printed == 0)
1061 {
1062 WARNING ("network plugin: Received signed packet, but the network "
1063 "plugin was not linked with libgcrypt, so I cannot "
1064 "verify the signature. The packet will be accepted.");
1065 warning_has_been_printed = 1;
1066 }
1068 parse_packet (se, buffer + part_len, buffer_size - part_len, flags);
1070 *ret_buffer = buffer + buffer_size;
1071 *ret_buffer_size = 0;
1073 return (0);
1074 } /* }}} int parse_part_sign_sha256 */
1075 #endif /* !HAVE_LIBGCRYPT */
1077 #if HAVE_LIBGCRYPT
1078 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1079 void **ret_buffer, size_t *ret_buffer_len,
1080 int flags)
1081 {
1082 char *buffer = *ret_buffer;
1083 size_t buffer_len = *ret_buffer_len;
1084 size_t payload_len;
1085 size_t part_size;
1086 size_t buffer_offset;
1087 uint16_t username_len;
1088 part_encryption_aes256_t pea;
1089 unsigned char hash[sizeof (pea.hash)];
1091 gcry_cipher_hd_t cypher;
1092 gcry_error_t err;
1094 /* Make sure at least the header if available. */
1095 if (buffer_len <= PART_ENCRYPTION_AES256_SIZE)
1096 {
1097 NOTICE ("network plugin: parse_part_encr_aes256: "
1098 "Discarding short packet.");
1099 return (-1);
1100 }
1102 buffer_offset = 0;
1104 /* Copy the unencrypted information into `pea'. */
1105 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
1106 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
1108 /* Check the `part size'. */
1109 part_size = ntohs (pea.head.length);
1110 if ((part_size <= PART_ENCRYPTION_AES256_SIZE)
1111 || (part_size > buffer_len))
1112 {
1113 NOTICE ("network plugin: parse_part_encr_aes256: "
1114 "Discarding part with invalid size.");
1115 return (-1);
1116 }
1118 /* Read the username */
1119 BUFFER_READ (&username_len, sizeof (username_len));
1120 username_len = ntohs (username_len);
1122 if ((username_len <= 0)
1123 || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1))))
1124 {
1125 NOTICE ("network plugin: parse_part_encr_aes256: "
1126 "Discarding part with invalid username length.");
1127 return (-1);
1128 }
1130 assert (username_len > 0);
1131 pea.username = malloc (username_len + 1);
1132 if (pea.username == NULL)
1133 return (-ENOMEM);
1134 BUFFER_READ (pea.username, username_len);
1135 pea.username[username_len] = 0;
1137 /* Last but not least, the initialization vector */
1138 BUFFER_READ (pea.iv, sizeof (pea.iv));
1140 /* Make sure we are at the right position */
1141 assert (buffer_offset == (username_len +
1142 PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash)));
1144 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
1145 pea.username);
1146 if (cypher == NULL)
1147 return (-1);
1149 payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len);
1150 assert (payload_len > 0);
1152 /* Decrypt the packet in-place */
1153 err = gcry_cipher_decrypt (cypher,
1154 buffer + buffer_offset,
1155 part_size - buffer_offset,
1156 /* in = */ NULL, /* in len = */ 0);
1157 if (err != 0)
1158 {
1159 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
1160 gcry_strerror (err));
1161 return (-1);
1162 }
1164 /* Read the hash */
1165 BUFFER_READ (pea.hash, sizeof (pea.hash));
1167 /* Make sure we're at the right position - again */
1168 assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE));
1169 assert (buffer_offset == (part_size - payload_len));
1171 /* Check hash sum */
1172 memset (hash, 0, sizeof (hash));
1173 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
1174 buffer + buffer_offset, payload_len);
1175 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
1176 {
1177 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
1178 return (-1);
1179 }
1181 parse_packet (se, buffer + buffer_offset, payload_len,
1182 flags | PP_ENCRYPTED);
1184 /* Update return values */
1185 *ret_buffer = buffer + part_size;
1186 *ret_buffer_len = buffer_len - part_size;
1188 return (0);
1189 } /* }}} int parse_part_encr_aes256 */
1190 /* #endif HAVE_LIBGCRYPT */
1192 #else /* if !HAVE_LIBGCRYPT */
1193 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1194 void **ret_buffer, size_t *ret_buffer_size, int flags)
1195 {
1196 static int warning_has_been_printed = 0;
1198 char *buffer;
1199 size_t buffer_size;
1200 size_t buffer_offset;
1202 part_header_t ph;
1203 size_t ph_length;
1205 buffer = *ret_buffer;
1206 buffer_size = *ret_buffer_size;
1207 buffer_offset = 0;
1209 /* parse_packet assures this minimum size. */
1210 assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length)));
1212 BUFFER_READ (&ph.type, sizeof (ph.type));
1213 BUFFER_READ (&ph.length, sizeof (ph.length));
1214 ph_length = ntohs (ph.length);
1216 if ((ph_length <= PART_ENCRYPTION_AES256_SIZE)
1217 || (ph_length > buffer_size))
1218 {
1219 ERROR ("network plugin: AES-256 encrypted part "
1220 "with invalid length received.");
1221 return (-1);
1222 }
1224 if (warning_has_been_printed == 0)
1225 {
1226 WARNING ("network plugin: Received encrypted packet, but the network "
1227 "plugin was not linked with libgcrypt, so I cannot "
1228 "decrypt it. The part will be discarded.");
1229 warning_has_been_printed = 1;
1230 }
1232 *ret_buffer += ph_length;
1233 *ret_buffer_size -= ph_length;
1235 return (0);
1236 } /* }}} int parse_part_encr_aes256 */
1237 #endif /* !HAVE_LIBGCRYPT */
1239 #undef BUFFER_READ
1241 static int parse_packet (sockent_t *se, /* {{{ */
1242 void *buffer, size_t buffer_size, int flags)
1243 {
1244 int status;
1246 value_list_t vl = VALUE_LIST_INIT;
1247 notification_t n;
1249 #if HAVE_LIBGCRYPT
1250 int packet_was_signed = (flags & PP_SIGNED);
1251 int packet_was_encrypted = (flags & PP_ENCRYPTED);
1252 int printed_ignore_warning = 0;
1253 #endif /* HAVE_LIBGCRYPT */
1256 memset (&vl, '\0', sizeof (vl));
1257 memset (&n, '\0', sizeof (n));
1258 status = 0;
1260 while ((status == 0) && (0 < buffer_size)
1261 && ((unsigned int) buffer_size > sizeof (part_header_t)))
1262 {
1263 uint16_t pkg_length;
1264 uint16_t pkg_type;
1266 memcpy ((void *) &pkg_type,
1267 (void *) buffer,
1268 sizeof (pkg_type));
1269 memcpy ((void *) &pkg_length,
1270 (void *) (buffer + sizeof (pkg_type)),
1271 sizeof (pkg_length));
1273 pkg_length = ntohs (pkg_length);
1274 pkg_type = ntohs (pkg_type);
1276 if (pkg_length > buffer_size)
1277 break;
1278 /* Ensure that this loop terminates eventually */
1279 if (pkg_length < (2 * sizeof (uint16_t)))
1280 break;
1282 if (pkg_type == TYPE_ENCR_AES256)
1283 {
1284 status = parse_part_encr_aes256 (se,
1285 &buffer, &buffer_size, flags);
1286 if (status != 0)
1287 {
1288 ERROR ("network plugin: Decrypting AES256 "
1289 "part failed "
1290 "with status %i.", status);
1291 break;
1292 }
1293 }
1294 #if HAVE_LIBGCRYPT
1295 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
1296 && (packet_was_encrypted == 0))
1297 {
1298 if (printed_ignore_warning == 0)
1299 {
1300 INFO ("network plugin: Unencrypted packet or "
1301 "part has been ignored.");
1302 printed_ignore_warning = 1;
1303 }
1304 buffer = ((char *) buffer) + pkg_length;
1305 continue;
1306 }
1307 #endif /* HAVE_LIBGCRYPT */
1308 else if (pkg_type == TYPE_SIGN_SHA256)
1309 {
1310 status = parse_part_sign_sha256 (se,
1311 &buffer, &buffer_size, flags);
1312 if (status != 0)
1313 {
1314 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1315 "signature failed "
1316 "with status %i.", status);
1317 break;
1318 }
1319 }
1320 #if HAVE_LIBGCRYPT
1321 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
1322 && (packet_was_encrypted == 0)
1323 && (packet_was_signed == 0))
1324 {
1325 if (printed_ignore_warning == 0)
1326 {
1327 INFO ("network plugin: Unsigned packet or "
1328 "part has been ignored.");
1329 printed_ignore_warning = 1;
1330 }
1331 buffer = ((char *) buffer) + pkg_length;
1332 continue;
1333 }
1334 #endif /* HAVE_LIBGCRYPT */
1335 else if (pkg_type == TYPE_VALUES)
1336 {
1337 status = parse_part_values (&buffer, &buffer_size,
1338 &vl.values, &vl.values_len);
1339 if (status != 0)
1340 break;
1342 network_dispatch_values (&vl);
1344 sfree (vl.values);
1345 }
1346 else if (pkg_type == TYPE_TIME)
1347 {
1348 uint64_t tmp = 0;
1349 status = parse_part_number (&buffer, &buffer_size,
1350 &tmp);
1351 if (status == 0)
1352 {
1353 vl.time = (time_t) tmp;
1354 n.time = (time_t) tmp;
1355 }
1356 }
1357 else if (pkg_type == TYPE_INTERVAL)
1358 {
1359 uint64_t tmp = 0;
1360 status = parse_part_number (&buffer, &buffer_size,
1361 &tmp);
1362 if (status == 0)
1363 vl.interval = (int) tmp;
1364 }
1365 else if (pkg_type == TYPE_HOST)
1366 {
1367 status = parse_part_string (&buffer, &buffer_size,
1368 vl.host, sizeof (vl.host));
1369 if (status == 0)
1370 sstrncpy (n.host, vl.host, sizeof (n.host));
1371 }
1372 else if (pkg_type == TYPE_PLUGIN)
1373 {
1374 status = parse_part_string (&buffer, &buffer_size,
1375 vl.plugin, sizeof (vl.plugin));
1376 if (status == 0)
1377 sstrncpy (n.plugin, vl.plugin,
1378 sizeof (n.plugin));
1379 }
1380 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1381 {
1382 status = parse_part_string (&buffer, &buffer_size,
1383 vl.plugin_instance,
1384 sizeof (vl.plugin_instance));
1385 if (status == 0)
1386 sstrncpy (n.plugin_instance,
1387 vl.plugin_instance,
1388 sizeof (n.plugin_instance));
1389 }
1390 else if (pkg_type == TYPE_TYPE)
1391 {
1392 status = parse_part_string (&buffer, &buffer_size,
1393 vl.type, sizeof (vl.type));
1394 if (status == 0)
1395 sstrncpy (n.type, vl.type, sizeof (n.type));
1396 }
1397 else if (pkg_type == TYPE_TYPE_INSTANCE)
1398 {
1399 status = parse_part_string (&buffer, &buffer_size,
1400 vl.type_instance,
1401 sizeof (vl.type_instance));
1402 if (status == 0)
1403 sstrncpy (n.type_instance, vl.type_instance,
1404 sizeof (n.type_instance));
1405 }
1406 else if (pkg_type == TYPE_MESSAGE)
1407 {
1408 status = parse_part_string (&buffer, &buffer_size,
1409 n.message, sizeof (n.message));
1411 if (status != 0)
1412 {
1413 /* do nothing */
1414 }
1415 else if ((n.severity != NOTIF_FAILURE)
1416 && (n.severity != NOTIF_WARNING)
1417 && (n.severity != NOTIF_OKAY))
1418 {
1419 INFO ("network plugin: "
1420 "Ignoring notification with "
1421 "unknown severity %i.",
1422 n.severity);
1423 }
1424 else if (n.time <= 0)
1425 {
1426 INFO ("network plugin: "
1427 "Ignoring notification with "
1428 "time == 0.");
1429 }
1430 else if (strlen (n.message) <= 0)
1431 {
1432 INFO ("network plugin: "
1433 "Ignoring notification with "
1434 "an empty message.");
1435 }
1436 else
1437 {
1438 plugin_dispatch_notification (&n);
1439 }
1440 }
1441 else if (pkg_type == TYPE_SEVERITY)
1442 {
1443 uint64_t tmp = 0;
1444 status = parse_part_number (&buffer, &buffer_size,
1445 &tmp);
1446 if (status == 0)
1447 n.severity = (int) tmp;
1448 }
1449 else
1450 {
1451 DEBUG ("network plugin: parse_packet: Unknown part"
1452 " type: 0x%04hx", pkg_type);
1453 buffer = ((char *) buffer) + pkg_length;
1454 }
1455 } /* while (buffer_size > sizeof (part_header_t)) */
1457 if (status == 0 && buffer_size > 0)
1458 WARNING ("network plugin: parse_packet: Received truncated "
1459 "packet, try increasing `MaxPacketSize'");
1461 return (status);
1462 } /* }}} int parse_packet */
1464 static void free_sockent_client (struct sockent_client *sec) /* {{{ */
1465 {
1466 if (sec->fd >= 0)
1467 {
1468 close (sec->fd);
1469 sec->fd = -1;
1470 }
1471 sfree (sec->addr);
1472 #if HAVE_LIBGCRYPT
1473 sfree (sec->username);
1474 sfree (sec->password);
1475 if (sec->cypher != NULL)
1476 gcry_cipher_close (sec->cypher);
1477 #endif
1478 } /* }}} void free_sockent_client */
1480 static void free_sockent_server (struct sockent_server *ses) /* {{{ */
1481 {
1482 size_t i;
1484 for (i = 0; i < ses->fd_num; i++)
1485 {
1486 if (ses->fd[i] >= 0)
1487 {
1488 close (ses->fd[i]);
1489 ses->fd[i] = -1;
1490 }
1491 }
1493 sfree (ses->fd);
1494 #if HAVE_LIBGCRYPT
1495 sfree (ses->auth_file);
1496 fbh_destroy (ses->userdb);
1497 if (ses->cypher != NULL)
1498 gcry_cipher_close (ses->cypher);
1499 #endif
1500 } /* }}} void free_sockent_server */
1502 static void sockent_destroy (sockent_t *se) /* {{{ */
1503 {
1504 sockent_t *next;
1506 DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se);
1508 while (se != NULL)
1509 {
1510 next = se->next;
1512 sfree (se->node);
1513 sfree (se->service);
1515 if (se->type == SOCKENT_TYPE_CLIENT)
1516 free_sockent_client (&se->data.client);
1517 else
1518 free_sockent_server (&se->data.server);
1520 sfree (se);
1521 se = next;
1522 }
1523 } /* }}} void sockent_destroy */
1525 /*
1526 * int network_set_ttl
1527 *
1528 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1529 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1530 *
1531 * The `struct addrinfo' is used to destinguish between unicast and multicast
1532 * sockets.
1533 */
1534 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1535 {
1536 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1537 network_config_ttl);
1539 assert (se->type == SOCKENT_TYPE_CLIENT);
1541 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1542 return (-1);
1544 if (ai->ai_family == AF_INET)
1545 {
1546 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1547 int optname;
1549 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1550 optname = IP_MULTICAST_TTL;
1551 else
1552 optname = IP_TTL;
1554 if (setsockopt (se->data.client.fd, IPPROTO_IP, optname,
1555 &network_config_ttl,
1556 sizeof (network_config_ttl)) == -1)
1557 {
1558 char errbuf[1024];
1559 ERROR ("setsockopt: %s",
1560 sstrerror (errno, errbuf, sizeof (errbuf)));
1561 return (-1);
1562 }
1563 }
1564 else if (ai->ai_family == AF_INET6)
1565 {
1566 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1567 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1568 int optname;
1570 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1571 optname = IPV6_MULTICAST_HOPS;
1572 else
1573 optname = IPV6_UNICAST_HOPS;
1575 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname,
1576 &network_config_ttl,
1577 sizeof (network_config_ttl)) == -1)
1578 {
1579 char errbuf[1024];
1580 ERROR ("setsockopt: %s",
1581 sstrerror (errno, errbuf,
1582 sizeof (errbuf)));
1583 return (-1);
1584 }
1585 }
1587 return (0);
1588 } /* int network_set_ttl */
1590 static int network_set_interface (const sockent_t *se, const struct addrinfo *ai) /* {{{ */
1591 {
1592 DEBUG ("network plugin: network_set_interface: interface index = %i;",
1593 se->interface);
1595 assert (se->type == SOCKENT_TYPE_CLIENT);
1597 if (ai->ai_family == AF_INET)
1598 {
1599 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1601 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1602 {
1603 #if KERNEL_LINUX
1604 struct ip_mreqn mreq;
1605 #else
1606 struct ip_mreq mreq;
1607 #endif
1609 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1610 #if KERNEL_LINUX
1611 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
1612 mreq.imr_ifindex = se->interface;
1613 #else
1614 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
1615 #endif
1617 if (setsockopt (se->data.client.fd, IPPROTO_IP, IP_MULTICAST_IF,
1618 &mreq, sizeof (mreq)) == -1)
1619 {
1620 char errbuf[1024];
1621 ERROR ("setsockopt: %s",
1622 sstrerror (errno, errbuf, sizeof (errbuf)));
1623 return (-1);
1624 }
1626 return (0);
1627 }
1628 }
1629 else if (ai->ai_family == AF_INET6)
1630 {
1631 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1633 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1634 {
1635 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
1636 &se->interface,
1637 sizeof (se->interface)) == -1)
1638 {
1639 char errbuf[1024];
1640 ERROR ("setsockopt: %s",
1641 sstrerror (errno, errbuf,
1642 sizeof (errbuf)));
1643 return (-1);
1644 }
1646 return (0);
1647 }
1648 }
1650 #if KERNEL_LINUX
1651 if (se->interface != 0)
1652 {
1653 char interface_name[IFNAMSIZ];
1655 if (if_indextoname (se->interface, interface_name) == NULL)
1656 return (-1);
1658 DEBUG ("network plugin: Binding socket to interface %s", interface_name);
1660 if (setsockopt (se->data.client.fd, SOL_SOCKET, SO_BINDTODEVICE,
1661 interface_name,
1662 sizeof(interface_name)) == -1 )
1663 {
1664 char errbuf[1024];
1665 ERROR ("setsockopt: %s",
1666 sstrerror (errno, errbuf, sizeof (errbuf)));
1667 return (-1);
1668 }
1669 }
1670 #endif
1672 return (0);
1673 } /* }}} network_set_interface */
1675 static int network_bind_socket (int fd, const struct addrinfo *ai, const int interface_idx)
1676 {
1677 int loop = 0;
1678 int yes = 1;
1680 /* allow multiple sockets to use the same PORT number */
1681 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
1682 &yes, sizeof(yes)) == -1) {
1683 char errbuf[1024];
1684 ERROR ("setsockopt: %s",
1685 sstrerror (errno, errbuf, sizeof (errbuf)));
1686 return (-1);
1687 }
1689 DEBUG ("fd = %i; calling `bind'", fd);
1691 if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1)
1692 {
1693 char errbuf[1024];
1694 ERROR ("bind: %s",
1695 sstrerror (errno, errbuf, sizeof (errbuf)));
1696 return (-1);
1697 }
1699 if (ai->ai_family == AF_INET)
1700 {
1701 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1702 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1703 {
1704 #if KERNEL_LINUX
1705 struct ip_mreqn mreq;
1706 #else
1707 struct ip_mreq mreq;
1708 #endif
1710 DEBUG ("fd = %i; IPv4 multicast address found", fd);
1712 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1713 #if KERNEL_LINUX
1714 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
1715 mreq.imr_ifindex = interface_idx;
1716 #else
1717 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
1718 #endif
1720 if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1721 &loop, sizeof (loop)) == -1)
1722 {
1723 char errbuf[1024];
1724 ERROR ("setsockopt: %s",
1725 sstrerror (errno, errbuf,
1726 sizeof (errbuf)));
1727 return (-1);
1728 }
1730 if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1731 &mreq, sizeof (mreq)) == -1)
1732 {
1733 char errbuf[1024];
1734 ERROR ("setsockopt: %s",
1735 sstrerror (errno, errbuf,
1736 sizeof (errbuf)));
1737 return (-1);
1738 }
1740 return (0);
1741 }
1742 }
1743 else if (ai->ai_family == AF_INET6)
1744 {
1745 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1746 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1747 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1748 {
1749 struct ipv6_mreq mreq;
1751 DEBUG ("fd = %i; IPv6 multicast address found", fd);
1753 memcpy (&mreq.ipv6mr_multiaddr,
1754 &addr->sin6_addr,
1755 sizeof (addr->sin6_addr));
1757 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1758 * ipv6mr_interface may be set to zeroes to
1759 * choose the default multicast interface or to
1760 * the index of a particular multicast-capable
1761 * interface if the host is multihomed.
1762 * Membership is associ-associated with a
1763 * single interface; programs running on
1764 * multihomed hosts may need to join the same
1765 * group on more than one interface.*/
1766 mreq.ipv6mr_interface = interface_idx;
1768 if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1769 &loop, sizeof (loop)) == -1)
1770 {
1771 char errbuf[1024];
1772 ERROR ("setsockopt: %s",
1773 sstrerror (errno, errbuf,
1774 sizeof (errbuf)));
1775 return (-1);
1776 }
1778 if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1779 &mreq, sizeof (mreq)) == -1)
1780 {
1781 char errbuf[1024];
1782 ERROR ("setsockopt: %s",
1783 sstrerror (errno, errbuf,
1784 sizeof (errbuf)));
1785 return (-1);
1786 }
1788 return (0);
1789 }
1790 }
1792 #if KERNEL_LINUX
1793 /* if a specific interface was set, bind the socket to it. But to avoid
1794 * possible problems with multicast routing, only do that for non-multicast
1795 * addresses */
1796 if (interface_idx != 0)
1797 {
1798 char interface_name[IFNAMSIZ];
1800 if (if_indextoname (interface_idx, interface_name) == NULL)
1801 return (-1);
1803 DEBUG ("fd = %i; Binding socket to interface %s", fd, interface_name);
1805 if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
1806 interface_name,
1807 sizeof(interface_name)) == -1 )
1808 {
1809 char errbuf[1024];
1810 ERROR ("setsockopt: %s",
1811 sstrerror (errno, errbuf, sizeof (errbuf)));
1812 return (-1);
1813 }
1814 }
1815 #endif
1817 return (0);
1818 } /* int network_bind_socket */
1820 /* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT'
1821 * or `SOCKENT_TYPE_SERVER' */
1822 static int sockent_init (sockent_t *se, int type) /* {{{ */
1823 {
1824 if (se == NULL)
1825 return (-1);
1827 memset (se, 0, sizeof (*se));
1829 se->type = SOCKENT_TYPE_CLIENT;
1830 se->node = NULL;
1831 se->service = NULL;
1832 se->interface = 0;
1833 se->next = NULL;
1835 if (type == SOCKENT_TYPE_SERVER)
1836 {
1837 se->type = SOCKENT_TYPE_SERVER;
1838 se->data.server.fd = NULL;
1839 #if HAVE_LIBGCRYPT
1840 se->data.server.security_level = SECURITY_LEVEL_NONE;
1841 se->data.server.auth_file = NULL;
1842 se->data.server.userdb = NULL;
1843 se->data.server.cypher = NULL;
1844 #endif
1845 }
1846 else
1847 {
1848 se->data.client.fd = -1;
1849 se->data.client.addr = NULL;
1850 #if HAVE_LIBGCRYPT
1851 se->data.client.security_level = SECURITY_LEVEL_NONE;
1852 se->data.client.username = NULL;
1853 se->data.client.password = NULL;
1854 se->data.client.cypher = NULL;
1855 #endif
1856 }
1858 return (0);
1859 } /* }}} int sockent_init */
1861 /* Open the file descriptors for a initialized sockent structure. */
1862 static int sockent_open (sockent_t *se) /* {{{ */
1863 {
1864 struct addrinfo ai_hints;
1865 struct addrinfo *ai_list, *ai_ptr;
1866 int ai_return;
1868 const char *node;
1869 const char *service;
1871 if (se == NULL)
1872 return (-1);
1874 /* Set up the security structures. */
1875 #if HAVE_LIBGCRYPT /* {{{ */
1876 if (se->type == SOCKENT_TYPE_CLIENT)
1877 {
1878 if (se->data.client.security_level > SECURITY_LEVEL_NONE)
1879 {
1880 if ((se->data.client.username == NULL)
1881 || (se->data.client.password == NULL))
1882 {
1883 ERROR ("network plugin: Client socket with "
1884 "security requested, but no "
1885 "credentials are configured.");
1886 return (-1);
1887 }
1888 gcry_md_hash_buffer (GCRY_MD_SHA256,
1889 se->data.client.password_hash,
1890 se->data.client.password,
1891 strlen (se->data.client.password));
1892 }
1893 }
1894 else /* (se->type == SOCKENT_TYPE_SERVER) */
1895 {
1896 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1897 {
1898 if (se->data.server.auth_file == NULL)
1899 {
1900 ERROR ("network plugin: Server socket with "
1901 "security requested, but no "
1902 "password file is configured.");
1903 return (-1);
1904 }
1905 }
1906 if (se->data.server.auth_file != NULL)
1907 {
1908 se->data.server.userdb = fbh_create (se->data.server.auth_file);
1909 if (se->data.server.userdb == NULL)
1910 {
1911 ERROR ("network plugin: Reading password file "
1912 "`%s' failed.",
1913 se->data.server.auth_file);
1914 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1915 return (-1);
1916 }
1917 }
1918 }
1919 #endif /* }}} HAVE_LIBGCRYPT */
1921 node = se->node;
1922 service = se->service;
1924 if (service == NULL)
1925 service = NET_DEFAULT_PORT;
1927 DEBUG ("network plugin: sockent_open: node = %s; service = %s;",
1928 node, service);
1930 memset (&ai_hints, 0, sizeof (ai_hints));
1931 ai_hints.ai_flags = 0;
1932 #ifdef AI_PASSIVE
1933 ai_hints.ai_flags |= AI_PASSIVE;
1934 #endif
1935 #ifdef AI_ADDRCONFIG
1936 ai_hints.ai_flags |= AI_ADDRCONFIG;
1937 #endif
1938 ai_hints.ai_family = AF_UNSPEC;
1939 ai_hints.ai_socktype = SOCK_DGRAM;
1940 ai_hints.ai_protocol = IPPROTO_UDP;
1942 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1943 if (ai_return != 0)
1944 {
1945 ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s",
1946 (se->node == NULL) ? "(null)" : se->node,
1947 (se->service == NULL) ? "(null)" : se->service,
1948 gai_strerror (ai_return));
1949 return (-1);
1950 }
1952 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1953 {
1954 int status;
1956 if (se->type == SOCKENT_TYPE_SERVER) /* {{{ */
1957 {
1958 int *tmp;
1960 tmp = realloc (se->data.server.fd,
1961 sizeof (*tmp) * (se->data.server.fd_num + 1));
1962 if (tmp == NULL)
1963 {
1964 ERROR ("network plugin: realloc failed.");
1965 continue;
1966 }
1967 se->data.server.fd = tmp;
1968 tmp = se->data.server.fd + se->data.server.fd_num;
1970 *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
1971 ai_ptr->ai_protocol);
1972 if (*tmp < 0)
1973 {
1974 char errbuf[1024];
1975 ERROR ("network plugin: socket(2) failed: %s",
1976 sstrerror (errno, errbuf,
1977 sizeof (errbuf)));
1978 continue;
1979 }
1981 status = network_bind_socket (*tmp, ai_ptr, se->interface);
1982 if (status != 0)
1983 {
1984 close (*tmp);
1985 *tmp = -1;
1986 continue;
1987 }
1989 se->data.server.fd_num++;
1990 continue;
1991 } /* }}} if (se->type == SOCKENT_TYPE_SERVER) */
1992 else /* if (se->type == SOCKENT_TYPE_CLIENT) {{{ */
1993 {
1994 se->data.client.fd = socket (ai_ptr->ai_family,
1995 ai_ptr->ai_socktype,
1996 ai_ptr->ai_protocol);
1997 if (se->data.client.fd < 0)
1998 {
1999 char errbuf[1024];
2000 ERROR ("network plugin: socket(2) failed: %s",
2001 sstrerror (errno, errbuf,
2002 sizeof (errbuf)));
2003 continue;
2004 }
2006 se->data.client.addr = malloc (sizeof (*se->data.client.addr));
2007 if (se->data.client.addr == NULL)
2008 {
2009 ERROR ("network plugin: malloc failed.");
2010 close (se->data.client.fd);
2011 se->data.client.fd = -1;
2012 continue;
2013 }
2015 memset (se->data.client.addr, 0, sizeof (*se->data.client.addr));
2016 assert (sizeof (*se->data.client.addr) >= ai_ptr->ai_addrlen);
2017 memcpy (se->data.client.addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
2018 se->data.client.addrlen = ai_ptr->ai_addrlen;
2020 network_set_ttl (se, ai_ptr);
2021 network_set_interface (se, ai_ptr);
2023 /* We don't open more than one write-socket per
2024 * node/service pair.. */
2025 break;
2026 } /* }}} if (se->type == SOCKENT_TYPE_CLIENT) */
2027 } /* for (ai_list) */
2029 freeaddrinfo (ai_list);
2031 /* Check if all went well. */
2032 if (se->type == SOCKENT_TYPE_SERVER)
2033 {
2034 if (se->data.server.fd_num <= 0)
2035 return (-1);
2036 }
2037 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
2038 {
2039 if (se->data.client.fd < 0)
2040 return (-1);
2041 }
2043 return (0);
2044 } /* }}} int sockent_open */
2046 /* Add a sockent to the global list of sockets */
2047 static int sockent_add (sockent_t *se) /* {{{ */
2048 {
2049 sockent_t *last_ptr;
2051 if (se == NULL)
2052 return (-1);
2054 if (se->type == SOCKENT_TYPE_SERVER)
2055 {
2056 struct pollfd *tmp;
2057 size_t i;
2059 tmp = realloc (listen_sockets_pollfd,
2060 sizeof (*tmp) * (listen_sockets_num
2061 + se->data.server.fd_num));
2062 if (tmp == NULL)
2063 {
2064 ERROR ("network plugin: realloc failed.");
2065 return (-1);
2066 }
2067 listen_sockets_pollfd = tmp;
2068 tmp = listen_sockets_pollfd + listen_sockets_num;
2070 for (i = 0; i < se->data.server.fd_num; i++)
2071 {
2072 memset (tmp + i, 0, sizeof (*tmp));
2073 tmp[i].fd = se->data.server.fd[i];
2074 tmp[i].events = POLLIN | POLLPRI;
2075 tmp[i].revents = 0;
2076 }
2078 listen_sockets_num += se->data.server.fd_num;
2080 if (listen_sockets == NULL)
2081 {
2082 listen_sockets = se;
2083 return (0);
2084 }
2085 last_ptr = listen_sockets;
2086 }
2087 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
2088 {
2089 if (sending_sockets == NULL)
2090 {
2091 sending_sockets = se;
2092 return (0);
2093 }
2094 last_ptr = sending_sockets;
2095 }
2097 while (last_ptr->next != NULL)
2098 last_ptr = last_ptr->next;
2099 last_ptr->next = se;
2101 return (0);
2102 } /* }}} int sockent_add */
2104 static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */
2105 {
2106 while (42)
2107 {
2108 receive_list_entry_t *ent;
2109 sockent_t *se;
2111 /* Lock and wait for more data to come in */
2112 pthread_mutex_lock (&receive_list_lock);
2113 while ((listen_loop == 0)
2114 && (receive_list_head == NULL))
2115 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
2117 /* Remove the head entry and unlock */
2118 ent = receive_list_head;
2119 if (ent != NULL)
2120 receive_list_head = ent->next;
2121 receive_list_length--;
2122 pthread_mutex_unlock (&receive_list_lock);
2124 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
2125 * because we dispatch all missing packets before shutting down. */
2126 if (ent == NULL)
2127 break;
2129 /* Look for the correct `sockent_t' */
2130 se = listen_sockets;
2131 while (se != NULL)
2132 {
2133 size_t i;
2135 for (i = 0; i < se->data.server.fd_num; i++)
2136 if (se->data.server.fd[i] == ent->fd)
2137 break;
2139 if (i < se->data.server.fd_num)
2140 break;
2142 se = se->next;
2143 }
2145 if (se == NULL)
2146 {
2147 ERROR ("network plugin: Got packet from FD %i, but can't "
2148 "find an appropriate socket entry.",
2149 ent->fd);
2150 sfree (ent->data);
2151 sfree (ent);
2152 continue;
2153 }
2155 parse_packet (se, ent->data, ent->data_len, /* flags = */ 0);
2156 sfree (ent->data);
2157 sfree (ent);
2158 } /* while (42) */
2160 return (NULL);
2161 } /* }}} void *dispatch_thread */
2163 static int network_receive (void) /* {{{ */
2164 {
2165 char buffer[network_config_packet_size];
2166 int buffer_len;
2168 int i;
2169 int status;
2171 receive_list_entry_t *private_list_head;
2172 receive_list_entry_t *private_list_tail;
2173 uint64_t private_list_length;
2175 assert (listen_sockets_num > 0);
2177 private_list_head = NULL;
2178 private_list_tail = NULL;
2179 private_list_length = 0;
2181 while (listen_loop == 0)
2182 {
2183 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
2185 if (status <= 0)
2186 {
2187 char errbuf[1024];
2188 if (errno == EINTR)
2189 continue;
2190 ERROR ("poll failed: %s",
2191 sstrerror (errno, errbuf, sizeof (errbuf)));
2192 return (-1);
2193 }
2195 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
2196 {
2197 receive_list_entry_t *ent;
2199 if ((listen_sockets_pollfd[i].revents
2200 & (POLLIN | POLLPRI)) == 0)
2201 continue;
2202 status--;
2204 buffer_len = recv (listen_sockets_pollfd[i].fd,
2205 buffer, sizeof (buffer),
2206 0 /* no flags */);
2207 if (buffer_len < 0)
2208 {
2209 char errbuf[1024];
2210 ERROR ("recv failed: %s",
2211 sstrerror (errno, errbuf,
2212 sizeof (errbuf)));
2213 return (-1);
2214 }
2216 stats_octets_rx += ((uint64_t) buffer_len);
2217 stats_packets_rx++;
2219 /* TODO: Possible performance enhancement: Do not free
2220 * these entries in the dispatch thread but put them in
2221 * another list, so we don't have to allocate more and
2222 * more of these structures. */
2223 ent = malloc (sizeof (receive_list_entry_t));
2224 if (ent == NULL)
2225 {
2226 ERROR ("network plugin: malloc failed.");
2227 return (-1);
2228 }
2229 memset (ent, 0, sizeof (receive_list_entry_t));
2230 ent->data = malloc (network_config_packet_size);
2231 if (ent->data == NULL)
2232 {
2233 sfree (ent);
2234 ERROR ("network plugin: malloc failed.");
2235 return (-1);
2236 }
2237 ent->fd = listen_sockets_pollfd[i].fd;
2238 ent->next = NULL;
2240 memcpy (ent->data, buffer, buffer_len);
2241 ent->data_len = buffer_len;
2243 if (private_list_head == NULL)
2244 private_list_head = ent;
2245 else
2246 private_list_tail->next = ent;
2247 private_list_tail = ent;
2248 private_list_length++;
2250 /* Do not block here. Blocking here has led to
2251 * insufficient performance in the past. */
2252 if (pthread_mutex_trylock (&receive_list_lock) == 0)
2253 {
2254 assert (((receive_list_head == NULL) && (receive_list_length == 0))
2255 || ((receive_list_head != NULL) && (receive_list_length != 0)));
2257 if (receive_list_head == NULL)
2258 receive_list_head = private_list_head;
2259 else
2260 receive_list_tail->next = private_list_head;
2261 receive_list_tail = private_list_tail;
2262 receive_list_length += private_list_length;
2264 pthread_cond_signal (&receive_list_cond);
2265 pthread_mutex_unlock (&receive_list_lock);
2267 private_list_head = NULL;
2268 private_list_tail = NULL;
2269 private_list_length = 0;
2270 }
2271 } /* for (listen_sockets_pollfd) */
2272 } /* while (listen_loop == 0) */
2274 /* Make sure everything is dispatched before exiting. */
2275 if (private_list_head != NULL)
2276 {
2277 pthread_mutex_lock (&receive_list_lock);
2279 if (receive_list_head == NULL)
2280 receive_list_head = private_list_head;
2281 else
2282 receive_list_tail->next = private_list_head;
2283 receive_list_tail = private_list_tail;
2284 receive_list_length += private_list_length;
2286 private_list_head = NULL;
2287 private_list_tail = NULL;
2288 private_list_length = 0;
2290 pthread_cond_signal (&receive_list_cond);
2291 pthread_mutex_unlock (&receive_list_lock);
2292 }
2294 return (0);
2295 } /* }}} int network_receive */
2297 static void *receive_thread (void __attribute__((unused)) *arg)
2298 {
2299 return (network_receive () ? (void *) 1 : (void *) 0);
2300 } /* void *receive_thread */
2302 static void network_init_buffer (void)
2303 {
2304 memset (send_buffer, 0, network_config_packet_size);
2305 send_buffer_ptr = send_buffer;
2306 send_buffer_fill = 0;
2308 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
2309 } /* int network_init_buffer */
2311 static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */
2312 const char *buffer, size_t buffer_size)
2313 {
2314 int status;
2316 while (42)
2317 {
2318 status = sendto (se->data.client.fd, buffer, buffer_size,
2319 /* flags = */ 0,
2320 (struct sockaddr *) se->data.client.addr,
2321 se->data.client.addrlen);
2322 if (status < 0)
2323 {
2324 char errbuf[1024];
2325 if (errno == EINTR)
2326 continue;
2327 ERROR ("network plugin: sendto failed: %s",
2328 sstrerror (errno, errbuf,
2329 sizeof (errbuf)));
2330 break;
2331 }
2333 break;
2334 } /* while (42) */
2335 } /* }}} void networt_send_buffer_plain */
2337 #if HAVE_LIBGCRYPT
2338 #define BUFFER_ADD(p,s) do { \
2339 memcpy (buffer + buffer_offset, (p), (s)); \
2340 buffer_offset += (s); \
2341 } while (0)
2343 static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */
2344 const char *in_buffer, size_t in_buffer_size)
2345 {
2346 part_signature_sha256_t ps;
2347 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2348 size_t buffer_offset;
2349 size_t username_len;
2351 gcry_md_hd_t hd;
2352 gcry_error_t err;
2353 unsigned char *hash;
2355 hd = NULL;
2356 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
2357 if (err != 0)
2358 {
2359 ERROR ("network plugin: Creating HMAC object failed: %s",
2360 gcry_strerror (err));
2361 return;
2362 }
2364 err = gcry_md_setkey (hd, se->data.client.password,
2365 strlen (se->data.client.password));
2366 if (err != 0)
2367 {
2368 ERROR ("network plugin: gcry_md_setkey failed: %s",
2369 gcry_strerror (err));
2370 gcry_md_close (hd);
2371 return;
2372 }
2374 username_len = strlen (se->data.client.username);
2375 if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE))
2376 {
2377 ERROR ("network plugin: Username too long: %s",
2378 se->data.client.username);
2379 return;
2380 }
2382 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE,
2383 se->data.client.username, username_len);
2384 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len,
2385 in_buffer, in_buffer_size);
2387 /* Initialize the `ps' structure. */
2388 memset (&ps, 0, sizeof (ps));
2389 ps.head.type = htons (TYPE_SIGN_SHA256);
2390 ps.head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len);
2392 /* Calculate the hash value. */
2393 gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE,
2394 username_len + in_buffer_size);
2395 hash = gcry_md_read (hd, GCRY_MD_SHA256);
2396 if (hash == NULL)
2397 {
2398 ERROR ("network plugin: gcry_md_read failed.");
2399 gcry_md_close (hd);
2400 return;
2401 }
2402 memcpy (ps.hash, hash, sizeof (ps.hash));
2404 /* Add the header */
2405 buffer_offset = 0;
2407 BUFFER_ADD (&ps.head.type, sizeof (ps.head.type));
2408 BUFFER_ADD (&ps.head.length, sizeof (ps.head.length));
2409 BUFFER_ADD (ps.hash, sizeof (ps.hash));
2411 assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE);
2413 gcry_md_close (hd);
2414 hd = NULL;
2416 buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size;
2417 networt_send_buffer_plain (se, buffer, buffer_offset);
2418 } /* }}} void networt_send_buffer_signed */
2420 static void networt_send_buffer_encrypted (sockent_t *se, /* {{{ */
2421 const char *in_buffer, size_t in_buffer_size)
2422 {
2423 part_encryption_aes256_t pea;
2424 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2425 size_t buffer_size;
2426 size_t buffer_offset;
2427 size_t header_size;
2428 size_t username_len;
2429 gcry_error_t err;
2430 gcry_cipher_hd_t cypher;
2432 /* Initialize the header fields */
2433 memset (&pea, 0, sizeof (pea));
2434 pea.head.type = htons (TYPE_ENCR_AES256);
2436 pea.username = se->data.client.username;
2438 username_len = strlen (pea.username);
2439 if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE)
2440 {
2441 ERROR ("network plugin: Username too long: %s", pea.username);
2442 return;
2443 }
2445 buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size;
2446 header_size = PART_ENCRYPTION_AES256_SIZE + username_len
2447 - sizeof (pea.hash);
2449 assert (buffer_size <= sizeof (buffer));
2450 DEBUG ("network plugin: networt_send_buffer_encrypted: "
2451 "buffer_size = %zu;", buffer_size);
2453 pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE
2454 + username_len + in_buffer_size));
2455 pea.username_length = htons ((uint16_t) username_len);
2457 /* Chose a random initialization vector. */
2458 gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2460 /* Create hash of the payload */
2461 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2463 /* Initialize the buffer */
2464 buffer_offset = 0;
2465 memset (buffer, 0, sizeof (buffer));
2468 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2469 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2470 BUFFER_ADD (&pea.username_length, sizeof (pea.username_length));
2471 BUFFER_ADD (pea.username, username_len);
2472 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2473 assert (buffer_offset == header_size);
2474 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2475 BUFFER_ADD (in_buffer, in_buffer_size);
2477 assert (buffer_offset == buffer_size);
2479 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
2480 se->data.client.password);
2481 if (cypher == NULL)
2482 return;
2484 /* Encrypt the buffer in-place */
2485 err = gcry_cipher_encrypt (cypher,
2486 buffer + header_size,
2487 buffer_size - header_size,
2488 /* in = */ NULL, /* in len = */ 0);
2489 if (err != 0)
2490 {
2491 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2492 gcry_strerror (err));
2493 return;
2494 }
2496 /* Send it out without further modifications */
2497 networt_send_buffer_plain (se, buffer, buffer_size);
2498 } /* }}} void networt_send_buffer_encrypted */
2499 #undef BUFFER_ADD
2500 #endif /* HAVE_LIBGCRYPT */
2502 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2503 {
2504 sockent_t *se;
2506 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2508 for (se = sending_sockets; se != NULL; se = se->next)
2509 {
2510 #if HAVE_LIBGCRYPT
2511 if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT)
2512 networt_send_buffer_encrypted (se, buffer, buffer_len);
2513 else if (se->data.client.security_level == SECURITY_LEVEL_SIGN)
2514 networt_send_buffer_signed (se, buffer, buffer_len);
2515 else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */
2516 #endif /* HAVE_LIBGCRYPT */
2517 networt_send_buffer_plain (se, buffer, buffer_len);
2518 } /* for (sending_sockets) */
2519 } /* }}} void network_send_buffer */
2521 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
2522 value_list_t *vl_def,
2523 const data_set_t *ds, const value_list_t *vl)
2524 {
2525 char *buffer_orig = buffer;
2527 if (strcmp (vl_def->host, vl->host) != 0)
2528 {
2529 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2530 vl->host, strlen (vl->host)) != 0)
2531 return (-1);
2532 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2533 }
2535 if (vl_def->time != vl->time)
2536 {
2537 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
2538 (uint64_t) vl->time))
2539 return (-1);
2540 vl_def->time = vl->time;
2541 }
2543 if (vl_def->interval != vl->interval)
2544 {
2545 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
2546 (uint64_t) vl->interval))
2547 return (-1);
2548 vl_def->interval = vl->interval;
2549 }
2551 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2552 {
2553 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2554 vl->plugin, strlen (vl->plugin)) != 0)
2555 return (-1);
2556 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2557 }
2559 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2560 {
2561 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2562 vl->plugin_instance,
2563 strlen (vl->plugin_instance)) != 0)
2564 return (-1);
2565 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2566 }
2568 if (strcmp (vl_def->type, vl->type) != 0)
2569 {
2570 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2571 vl->type, strlen (vl->type)) != 0)
2572 return (-1);
2573 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2574 }
2576 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2577 {
2578 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2579 vl->type_instance,
2580 strlen (vl->type_instance)) != 0)
2581 return (-1);
2582 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2583 }
2585 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2586 return (-1);
2588 return (buffer - buffer_orig);
2589 } /* }}} int add_to_buffer */
2591 static void flush_buffer (void)
2592 {
2593 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2594 send_buffer_fill);
2596 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2598 stats_octets_tx += ((uint64_t) send_buffer_fill);
2599 stats_packets_tx++;
2601 network_init_buffer ();
2602 }
2604 static int network_write (const data_set_t *ds, const value_list_t *vl,
2605 user_data_t __attribute__((unused)) *user_data)
2606 {
2607 int status;
2609 if (!check_send_okay (vl))
2610 {
2611 #if COLLECT_DEBUG
2612 char name[6*DATA_MAX_NAME_LEN];
2613 FORMAT_VL (name, sizeof (name), vl);
2614 name[sizeof (name) - 1] = 0;
2615 DEBUG ("network plugin: network_write: "
2616 "NOT sending %s.", name);
2617 #endif
2618 /* Counter is not protected by another lock and may be reached by
2619 * multiple threads */
2620 pthread_mutex_lock (&stats_lock);
2621 stats_values_not_sent++;
2622 pthread_mutex_unlock (&stats_lock);
2623 return (0);
2624 }
2626 uc_meta_data_add_unsigned_int (vl,
2627 "network:time_sent", (uint64_t) vl->time);
2629 pthread_mutex_lock (&send_buffer_lock);
2631 status = add_to_buffer (send_buffer_ptr,
2632 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2633 &send_buffer_vl,
2634 ds, vl);
2635 if (status >= 0)
2636 {
2637 /* status == bytes added to the buffer */
2638 send_buffer_fill += status;
2639 send_buffer_ptr += status;
2641 stats_values_sent++;
2642 }
2643 else
2644 {
2645 flush_buffer ();
2647 status = add_to_buffer (send_buffer_ptr,
2648 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2649 &send_buffer_vl,
2650 ds, vl);
2652 if (status >= 0)
2653 {
2654 send_buffer_fill += status;
2655 send_buffer_ptr += status;
2657 stats_values_sent++;
2658 }
2659 }
2661 if (status < 0)
2662 {
2663 ERROR ("network plugin: Unable to append to the "
2664 "buffer for some weird reason");
2665 }
2666 else if ((network_config_packet_size - send_buffer_fill) < 15)
2667 {
2668 flush_buffer ();
2669 }
2671 pthread_mutex_unlock (&send_buffer_lock);
2673 return ((status < 0) ? -1 : 0);
2674 } /* int network_write */
2676 static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
2677 int *retval)
2678 {
2679 if ((ci->values_num != 1)
2680 || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
2681 && (ci->values[0].type != OCONFIG_TYPE_STRING)))
2682 {
2683 ERROR ("network plugin: The `%s' config option needs "
2684 "exactly one boolean argument.", ci->key);
2685 return (-1);
2686 }
2688 if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
2689 {
2690 if (ci->values[0].value.boolean)
2691 *retval = 1;
2692 else
2693 *retval = 0;
2694 }
2695 else
2696 {
2697 char *str = ci->values[0].value.string;
2699 if (IS_TRUE (str))
2700 *retval = 1;
2701 else if (IS_FALSE (str))
2702 *retval = 0;
2703 else
2704 {
2705 ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
2706 "option as boolean value.",
2707 str, ci->key);
2708 return (-1);
2709 }
2710 }
2712 return (0);
2713 } /* }}} int network_config_set_boolean */
2715 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2716 {
2717 int tmp;
2718 if ((ci->values_num != 1)
2719 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2720 {
2721 WARNING ("network plugin: The `TimeToLive' config option needs exactly "
2722 "one numeric argument.");
2723 return (-1);
2724 }
2726 tmp = (int) ci->values[0].value.number;
2727 if ((tmp > 0) && (tmp <= 255))
2728 network_config_ttl = tmp;
2730 return (0);
2731 } /* }}} int network_config_set_ttl */
2733 static int network_config_set_interface (const oconfig_item_t *ci, /* {{{ */
2734 int *interface)
2735 {
2736 if ((ci->values_num != 1)
2737 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2738 {
2739 WARNING ("network plugin: The `Interface' config option needs exactly "
2740 "one string argument.");
2741 return (-1);
2742 }
2744 if (interface == NULL)
2745 return (-1);
2747 *interface = if_nametoindex (ci->values[0].value.string);
2749 return (0);
2750 } /* }}} int network_config_set_interface */
2752 static int network_config_set_buffer_size (const oconfig_item_t *ci) /* {{{ */
2753 {
2754 int tmp;
2755 if ((ci->values_num != 1)
2756 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2757 {
2758 WARNING ("network plugin: The `MaxPacketSize' config option needs exactly "
2759 "one numeric argument.");
2760 return (-1);
2761 }
2763 tmp = (int) ci->values[0].value.number;
2764 if ((tmp >= 1024) && (tmp <= 65535))
2765 network_config_packet_size = tmp;
2767 return (0);
2768 } /* }}} int network_config_set_buffer_size */
2770 #if HAVE_LIBGCRYPT
2771 static int network_config_set_string (const oconfig_item_t *ci, /* {{{ */
2772 char **ret_string)
2773 {
2774 char *tmp;
2775 if ((ci->values_num != 1)
2776 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2777 {
2778 WARNING ("network plugin: The `%s' config option needs exactly "
2779 "one string argument.", ci->key);
2780 return (-1);
2781 }
2783 tmp = strdup (ci->values[0].value.string);
2784 if (tmp == NULL)
2785 return (-1);
2787 sfree (*ret_string);
2788 *ret_string = tmp;
2790 return (0);
2791 } /* }}} int network_config_set_string */
2792 #endif /* HAVE_LIBGCRYPT */
2794 #if HAVE_LIBGCRYPT
2795 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
2796 int *retval)
2797 {
2798 char *str;
2799 if ((ci->values_num != 1)
2800 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2801 {
2802 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
2803 "one string argument.");
2804 return (-1);
2805 }
2807 str = ci->values[0].value.string;
2808 if (strcasecmp ("Encrypt", str) == 0)
2809 *retval = SECURITY_LEVEL_ENCRYPT;
2810 else if (strcasecmp ("Sign", str) == 0)
2811 *retval = SECURITY_LEVEL_SIGN;
2812 else if (strcasecmp ("None", str) == 0)
2813 *retval = SECURITY_LEVEL_NONE;
2814 else
2815 {
2816 WARNING ("network plugin: Unknown security level: %s.", str);
2817 return (-1);
2818 }
2820 return (0);
2821 } /* }}} int network_config_set_security_level */
2822 #endif /* HAVE_LIBGCRYPT */
2824 static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */
2825 {
2826 sockent_t *se;
2827 int status;
2828 int i;
2830 if ((ci->values_num < 1) || (ci->values_num > 2)
2831 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2832 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2833 {
2834 ERROR ("network plugin: The `%s' config option needs "
2835 "one or two string arguments.", ci->key);
2836 return (-1);
2837 }
2839 se = malloc (sizeof (*se));
2840 if (se == NULL)
2841 {
2842 ERROR ("network plugin: malloc failed.");
2843 return (-1);
2844 }
2845 sockent_init (se, SOCKENT_TYPE_SERVER);
2847 se->node = strdup (ci->values[0].value.string);
2848 if (ci->values_num >= 2)
2849 se->service = strdup (ci->values[1].value.string);
2851 for (i = 0; i < ci->children_num; i++)
2852 {
2853 oconfig_item_t *child = ci->children + i;
2855 #if HAVE_LIBGCRYPT
2856 if (strcasecmp ("AuthFile", child->key) == 0)
2857 network_config_set_string (child, &se->data.server.auth_file);
2858 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2859 network_config_set_security_level (child,
2860 &se->data.server.security_level);
2861 else
2862 #endif /* HAVE_LIBGCRYPT */
2863 if (strcasecmp ("Interface", child->key) == 0)
2864 network_config_set_interface (child,
2865 &se->interface);
2866 else
2867 {
2868 WARNING ("network plugin: Option `%s' is not allowed here.",
2869 child->key);
2870 }
2871 }
2873 #if HAVE_LIBGCRYPT
2874 if ((se->data.server.security_level > SECURITY_LEVEL_NONE)
2875 && (se->data.server.auth_file == NULL))
2876 {
2877 ERROR ("network plugin: A security level higher than `none' was "
2878 "requested, but no AuthFile option was given. Cowardly refusing to "
2879 "open this socket!");
2880 sockent_destroy (se);
2881 return (-1);
2882 }
2883 #endif /* HAVE_LIBGCRYPT */
2885 status = sockent_open (se);
2886 if (status != 0)
2887 {
2888 ERROR ("network plugin: network_config_add_listen: sockent_open failed.");
2889 sockent_destroy (se);
2890 return (-1);
2891 }
2893 status = sockent_add (se);
2894 if (status != 0)
2895 {
2896 ERROR ("network plugin: network_config_add_listen: sockent_add failed.");
2897 sockent_destroy (se);
2898 return (-1);
2899 }
2901 return (0);
2902 } /* }}} int network_config_add_listen */
2904 static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */
2905 {
2906 sockent_t *se;
2907 int status;
2908 int i;
2910 if ((ci->values_num < 1) || (ci->values_num > 2)
2911 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2912 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2913 {
2914 ERROR ("network plugin: The `%s' config option needs "
2915 "one or two string arguments.", ci->key);
2916 return (-1);
2917 }
2919 se = malloc (sizeof (*se));
2920 if (se == NULL)
2921 {
2922 ERROR ("network plugin: malloc failed.");
2923 return (-1);
2924 }
2925 sockent_init (se, SOCKENT_TYPE_CLIENT);
2927 se->node = strdup (ci->values[0].value.string);
2928 if (ci->values_num >= 2)
2929 se->service = strdup (ci->values[1].value.string);
2931 for (i = 0; i < ci->children_num; i++)
2932 {
2933 oconfig_item_t *child = ci->children + i;
2935 #if HAVE_LIBGCRYPT
2936 if (strcasecmp ("Username", child->key) == 0)
2937 network_config_set_string (child, &se->data.client.username);
2938 else if (strcasecmp ("Password", child->key) == 0)
2939 network_config_set_string (child, &se->data.client.password);
2940 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2941 network_config_set_security_level (child,
2942 &se->data.client.security_level);
2943 else
2944 #endif /* HAVE_LIBGCRYPT */
2945 if (strcasecmp ("Interface", child->key) == 0)
2946 network_config_set_interface (child,
2947 &se->interface);
2948 else
2949 {
2950 WARNING ("network plugin: Option `%s' is not allowed here.",
2951 child->key);
2952 }
2953 }
2955 #if HAVE_LIBGCRYPT
2956 if ((se->data.client.security_level > SECURITY_LEVEL_NONE)
2957 && ((se->data.client.username == NULL)
2958 || (se->data.client.password == NULL)))
2959 {
2960 ERROR ("network plugin: A security level higher than `none' was "
2961 "requested, but no Username or Password option was given. "
2962 "Cowardly refusing to open this socket!");
2963 sockent_destroy (se);
2964 return (-1);
2965 }
2966 #endif /* HAVE_LIBGCRYPT */
2968 status = sockent_open (se);
2969 if (status != 0)
2970 {
2971 ERROR ("network plugin: network_config_add_server: sockent_open failed.");
2972 sockent_destroy (se);
2973 return (-1);
2974 }
2976 status = sockent_add (se);
2977 if (status != 0)
2978 {
2979 ERROR ("network plugin: network_config_add_server: sockent_add failed.");
2980 sockent_destroy (se);
2981 return (-1);
2982 }
2984 return (0);
2985 } /* }}} int network_config_add_server */
2987 static int network_config (oconfig_item_t *ci) /* {{{ */
2988 {
2989 int i;
2991 for (i = 0; i < ci->children_num; i++)
2992 {
2993 oconfig_item_t *child = ci->children + i;
2995 if (strcasecmp ("Listen", child->key) == 0)
2996 network_config_add_listen (child);
2997 else if (strcasecmp ("Server", child->key) == 0)
2998 network_config_add_server (child);
2999 else if (strcasecmp ("TimeToLive", child->key) == 0)
3000 network_config_set_ttl (child);
3001 else if (strcasecmp ("MaxPacketSize", child->key) == 0)
3002 network_config_set_buffer_size (child);
3003 else if (strcasecmp ("Forward", child->key) == 0)
3004 network_config_set_boolean (child, &network_config_forward);
3005 else if (strcasecmp ("ReportStats", child->key) == 0)
3006 network_config_set_boolean (child, &network_config_stats);
3007 else if (strcasecmp ("CacheFlush", child->key) == 0)
3008 /* no op for backwards compatibility only */;
3009 else
3010 {
3011 WARNING ("network plugin: Option `%s' is not allowed here.",
3012 child->key);
3013 }
3014 }
3016 return (0);
3017 } /* }}} int network_config */
3019 static int network_notification (const notification_t *n,
3020 user_data_t __attribute__((unused)) *user_data)
3021 {
3022 char buffer[network_config_packet_size];
3023 char *buffer_ptr = buffer;
3024 int buffer_free = sizeof (buffer);
3025 int status;
3027 memset (buffer, '\0', sizeof (buffer));
3030 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
3031 (uint64_t) n->time);
3032 if (status != 0)
3033 return (-1);
3035 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
3036 (uint64_t) n->severity);
3037 if (status != 0)
3038 return (-1);
3040 if (strlen (n->host) > 0)
3041 {
3042 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
3043 n->host, strlen (n->host));
3044 if (status != 0)
3045 return (-1);
3046 }
3048 if (strlen (n->plugin) > 0)
3049 {
3050 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
3051 n->plugin, strlen (n->plugin));
3052 if (status != 0)
3053 return (-1);
3054 }
3056 if (strlen (n->plugin_instance) > 0)
3057 {
3058 status = write_part_string (&buffer_ptr, &buffer_free,
3059 TYPE_PLUGIN_INSTANCE,
3060 n->plugin_instance, strlen (n->plugin_instance));
3061 if (status != 0)
3062 return (-1);
3063 }
3065 if (strlen (n->type) > 0)
3066 {
3067 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
3068 n->type, strlen (n->type));
3069 if (status != 0)
3070 return (-1);
3071 }
3073 if (strlen (n->type_instance) > 0)
3074 {
3075 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
3076 n->type_instance, strlen (n->type_instance));
3077 if (status != 0)
3078 return (-1);
3079 }
3081 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
3082 n->message, strlen (n->message));
3083 if (status != 0)
3084 return (-1);
3086 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
3088 return (0);
3089 } /* int network_notification */
3091 static int network_shutdown (void)
3092 {
3093 listen_loop++;
3095 /* Kill the listening thread */
3096 if (receive_thread_running != 0)
3097 {
3098 INFO ("network plugin: Stopping receive thread.");
3099 pthread_kill (receive_thread_id, SIGTERM);
3100 pthread_join (receive_thread_id, NULL /* no return value */);
3101 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
3102 receive_thread_running = 0;
3103 }
3105 /* Shutdown the dispatching thread */
3106 if (dispatch_thread_running != 0)
3107 {
3108 INFO ("network plugin: Stopping dispatch thread.");
3109 pthread_mutex_lock (&receive_list_lock);
3110 pthread_cond_broadcast (&receive_list_cond);
3111 pthread_mutex_unlock (&receive_list_lock);
3112 pthread_join (dispatch_thread_id, /* ret = */ NULL);
3113 dispatch_thread_running = 0;
3114 }
3116 sockent_destroy (listen_sockets);
3118 if (send_buffer_fill > 0)
3119 flush_buffer ();
3121 sfree (send_buffer);
3123 /* TODO: Close `sending_sockets' */
3125 plugin_unregister_config ("network");
3126 plugin_unregister_init ("network");
3127 plugin_unregister_write ("network");
3128 plugin_unregister_shutdown ("network");
3130 return (0);
3131 } /* int network_shutdown */
3133 static int network_stats_read (void) /* {{{ */
3134 {
3135 uint64_t copy_octets_rx;
3136 uint64_t copy_octets_tx;
3137 uint64_t copy_packets_rx;
3138 uint64_t copy_packets_tx;
3139 uint64_t copy_values_dispatched;
3140 uint64_t copy_values_not_dispatched;
3141 uint64_t copy_values_sent;
3142 uint64_t copy_values_not_sent;
3143 uint64_t copy_receive_list_length;
3144 value_list_t vl = VALUE_LIST_INIT;
3145 value_t values[2];
3147 copy_octets_rx = stats_octets_rx;
3148 copy_octets_tx = stats_octets_tx;
3149 copy_packets_rx = stats_packets_rx;
3150 copy_packets_tx = stats_packets_tx;
3151 copy_values_dispatched = stats_values_dispatched;
3152 copy_values_not_dispatched = stats_values_not_dispatched;
3153 copy_values_sent = stats_values_sent;
3154 copy_values_not_sent = stats_values_not_sent;
3155 copy_receive_list_length = receive_list_length;
3157 /* Initialize `vl' */
3158 vl.values = values;
3159 vl.values_len = 2;
3160 vl.time = 0;
3161 vl.interval = interval_g;
3162 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
3163 sstrncpy (vl.plugin, "network", sizeof (vl.plugin));
3165 /* Octets received / sent */
3166 vl.values[0].counter = (counter_t) copy_octets_rx;
3167 vl.values[1].counter = (counter_t) copy_octets_tx;
3168 sstrncpy (vl.type, "if_octets", sizeof (vl.type));
3169 plugin_dispatch_values (&vl);
3171 /* Packets received / send */
3172 vl.values[0].counter = (counter_t) copy_packets_rx;
3173 vl.values[1].counter = (counter_t) copy_packets_tx;
3174 sstrncpy (vl.type, "if_packets", sizeof (vl.type));
3175 plugin_dispatch_values (&vl);
3177 /* Values (not) dispatched and (not) send */
3178 sstrncpy (vl.type, "total_values", sizeof (vl.type));
3179 vl.values_len = 1;
3181 vl.values[0].derive = (derive_t) copy_values_dispatched;
3182 sstrncpy (vl.type_instance, "dispatch-accepted",
3183 sizeof (vl.type_instance));
3184 plugin_dispatch_values (&vl);
3186 vl.values[0].derive = (derive_t) copy_values_not_dispatched;
3187 sstrncpy (vl.type_instance, "dispatch-rejected",
3188 sizeof (vl.type_instance));
3189 plugin_dispatch_values (&vl);
3191 vl.values[0].derive = (derive_t) copy_values_sent;
3192 sstrncpy (vl.type_instance, "send-accepted",
3193 sizeof (vl.type_instance));
3194 plugin_dispatch_values (&vl);
3196 vl.values[0].derive = (derive_t) copy_values_not_sent;
3197 sstrncpy (vl.type_instance, "send-rejected",
3198 sizeof (vl.type_instance));
3199 plugin_dispatch_values (&vl);
3201 /* Receive queue length */
3202 vl.values[0].gauge = (gauge_t) copy_receive_list_length;
3203 sstrncpy (vl.type, "queue_length", sizeof (vl.type));
3204 vl.type_instance[0] = 0;
3205 plugin_dispatch_values (&vl);
3207 return (0);
3208 } /* }}} int network_stats_read */
3210 static int network_init (void)
3211 {
3212 static _Bool have_init = false;
3214 /* Check if we were already initialized. If so, just return - there's
3215 * nothing more to do (for now, that is). */
3216 if (have_init)
3217 return (0);
3218 have_init = true;
3220 #if HAVE_LIBGCRYPT
3221 gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
3222 gcry_control (GCRYCTL_INIT_SECMEM, 32768, 0);
3223 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
3224 #endif
3226 if (network_config_stats != 0)
3227 plugin_register_read ("network", network_stats_read);
3229 plugin_register_shutdown ("network", network_shutdown);
3231 send_buffer = malloc (network_config_packet_size);
3232 if (send_buffer == NULL)
3233 {
3234 ERROR ("network plugin: malloc failed.");
3235 return (-1);
3236 }
3237 network_init_buffer ();
3239 /* setup socket(s) and so on */
3240 if (sending_sockets != NULL)
3241 {
3242 plugin_register_write ("network", network_write,
3243 /* user_data = */ NULL);
3244 plugin_register_notification ("network", network_notification,
3245 /* user_data = */ NULL);
3246 }
3248 /* If no threads need to be started, return here. */
3249 if ((listen_sockets_num == 0)
3250 || ((dispatch_thread_running != 0)
3251 && (receive_thread_running != 0)))
3252 return (0);
3254 if (dispatch_thread_running == 0)
3255 {
3256 int status;
3257 status = pthread_create (&dispatch_thread_id,
3258 NULL /* no attributes */,
3259 dispatch_thread,
3260 NULL /* no argument */);
3261 if (status != 0)
3262 {
3263 char errbuf[1024];
3264 ERROR ("network: pthread_create failed: %s",
3265 sstrerror (errno, errbuf,
3266 sizeof (errbuf)));
3267 }
3268 else
3269 {
3270 dispatch_thread_running = 1;
3271 }
3272 }
3274 if (receive_thread_running == 0)
3275 {
3276 int status;
3277 status = pthread_create (&receive_thread_id,
3278 NULL /* no attributes */,
3279 receive_thread,
3280 NULL /* no argument */);
3281 if (status != 0)
3282 {
3283 char errbuf[1024];
3284 ERROR ("network: pthread_create failed: %s",
3285 sstrerror (errno, errbuf,
3286 sizeof (errbuf)));
3287 }
3288 else
3289 {
3290 receive_thread_running = 1;
3291 }
3292 }
3294 return (0);
3295 } /* int network_init */
3297 /*
3298 * The flush option of the network plugin cannot flush individual identifiers.
3299 * All the values are added to a buffer and sent when the buffer is full, the
3300 * requested value may or may not be in there, it's not worth finding out. We
3301 * just send the buffer if `flush' is called - if the requested value was in
3302 * there, good. If not, well, then there is nothing to flush.. -octo
3303 */
3304 static int network_flush (int timeout,
3305 const char __attribute__((unused)) *identifier,
3306 user_data_t __attribute__((unused)) *user_data)
3307 {
3308 pthread_mutex_lock (&send_buffer_lock);
3310 if (send_buffer_fill > 0)
3311 flush_buffer ();
3313 pthread_mutex_unlock (&send_buffer_lock);
3315 return (0);
3316 } /* int network_flush */
3318 void module_register (void)
3319 {
3320 plugin_register_complex_config ("network", network_config);
3321 plugin_register_init ("network", network_init);
3322 plugin_register_flush ("network", network_flush,
3323 /* user_data = */ NULL);
3324 } /* void module_register */
3326 /* vim: set fdm=marker : */