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 General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 * Aman Gupta <aman at tmm1.net>
22 **/
24 #define _BSD_SOURCE /* For struct ip_mreq */
26 #include "collectd.h"
27 #include "plugin.h"
28 #include "common.h"
29 #include "configfile.h"
30 #include "utils_fbhash.h"
31 #include "utils_avltree.h"
32 #include "utils_cache.h"
34 #include "network.h"
36 #if HAVE_PTHREAD_H
37 # include <pthread.h>
38 #endif
39 #if HAVE_SYS_SOCKET_H
40 # include <sys/socket.h>
41 #endif
42 #if HAVE_NETDB_H
43 # include <netdb.h>
44 #endif
45 #if HAVE_NETINET_IN_H
46 # include <netinet/in.h>
47 #endif
48 #if HAVE_ARPA_INET_H
49 # include <arpa/inet.h>
50 #endif
51 #if HAVE_POLL_H
52 # include <poll.h>
53 #endif
55 #if HAVE_LIBGCRYPT
56 # include <gcrypt.h>
57 GCRY_THREAD_OPTION_PTHREAD_IMPL;
58 #endif
60 #ifndef IPV6_ADD_MEMBERSHIP
61 # ifdef IPV6_JOIN_GROUP
62 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
63 # else
64 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
65 # endif
66 #endif /* !IP_ADD_MEMBERSHIP */
68 /*
69 * Maximum size required for encryption / signing:
70 *
71 * 42 bytes for the encryption header
72 * + 64 bytes for the username
73 * -----------
74 * = 106 bytes
75 */
76 #define BUFF_SIG_SIZE 106
78 /*
79 * Private data types
80 */
81 #define SECURITY_LEVEL_NONE 0
82 #if HAVE_LIBGCRYPT
83 # define SECURITY_LEVEL_SIGN 1
84 # define SECURITY_LEVEL_ENCRYPT 2
85 #endif
86 struct sockent_client
87 {
88 int fd;
89 struct sockaddr_storage *addr;
90 socklen_t addrlen;
91 #if HAVE_LIBGCRYPT
92 int security_level;
93 char *username;
94 char *password;
95 gcry_cipher_hd_t cypher;
96 unsigned char password_hash[32];
97 #endif
98 };
100 struct sockent_server
101 {
102 int *fd;
103 size_t fd_num;
104 #if HAVE_LIBGCRYPT
105 int security_level;
106 char *auth_file;
107 fbhash_t *userdb;
108 gcry_cipher_hd_t cypher;
109 #endif
110 };
112 typedef struct sockent
113 {
114 #define SOCKENT_TYPE_CLIENT 1
115 #define SOCKENT_TYPE_SERVER 2
116 int type;
118 char *node;
119 char *service;
121 union
122 {
123 struct sockent_client client;
124 struct sockent_server server;
125 } data;
127 struct sockent *next;
128 } sockent_t;
130 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
131 * 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
132 * +-------+-----------------------+-------------------------------+
133 * ! Ver. ! ! Length !
134 * +-------+-----------------------+-------------------------------+
135 */
136 struct part_header_s
137 {
138 uint16_t type;
139 uint16_t length;
140 };
141 typedef struct part_header_s part_header_t;
143 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
144 * 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
145 * +-------------------------------+-------------------------------+
146 * ! Type ! Length !
147 * +-------------------------------+-------------------------------+
148 * : (Length - 4) Bytes :
149 * +---------------------------------------------------------------+
150 */
151 struct part_string_s
152 {
153 part_header_t *head;
154 char *value;
155 };
156 typedef struct part_string_s part_string_t;
158 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
159 * 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
160 * +-------------------------------+-------------------------------+
161 * ! Type ! Length !
162 * +-------------------------------+-------------------------------+
163 * : (Length - 4 == 2 || 4 || 8) Bytes :
164 * +---------------------------------------------------------------+
165 */
166 struct part_number_s
167 {
168 part_header_t *head;
169 uint64_t *value;
170 };
171 typedef struct part_number_s part_number_t;
173 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
174 * 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
175 * +-------------------------------+-------------------------------+
176 * ! Type ! Length !
177 * +-------------------------------+---------------+---------------+
178 * ! Num of values ! Type0 ! Type1 !
179 * +-------------------------------+---------------+---------------+
180 * ! Value0 !
181 * ! !
182 * +---------------------------------------------------------------+
183 * ! Value1 !
184 * ! !
185 * +---------------------------------------------------------------+
186 */
187 struct part_values_s
188 {
189 part_header_t *head;
190 uint16_t *num_values;
191 uint8_t *values_types;
192 value_t *values;
193 };
194 typedef struct part_values_s part_values_t;
196 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
197 * 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
198 * +-------------------------------+-------------------------------+
199 * ! Type ! Length !
200 * +-------------------------------+-------------------------------+
201 * ! Hash (Bits 0 - 31) !
202 * : : :
203 * ! Hash (Bits 224 - 255) !
204 * +---------------------------------------------------------------+
205 */
206 /* Minimum size */
207 #define PART_SIGNATURE_SHA256_SIZE 36
208 struct part_signature_sha256_s
209 {
210 part_header_t head;
211 unsigned char hash[32];
212 char *username;
213 };
214 typedef struct part_signature_sha256_s part_signature_sha256_t;
216 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
217 * 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
218 * +-------------------------------+-------------------------------+
219 * ! Type ! Length !
220 * +-------------------------------+-------------------------------+
221 * ! Original length ! Padding (0 - 15 bytes) !
222 * +-------------------------------+-------------------------------+
223 * ! Hash (Bits 0 - 31) !
224 * : : :
225 * ! Hash (Bits 128 - 159) !
226 * +---------------------------------------------------------------+
227 */
228 /* Minimum size */
229 #define PART_ENCRYPTION_AES256_SIZE 42
230 struct part_encryption_aes256_s
231 {
232 part_header_t head;
233 uint16_t username_length;
234 char *username;
235 unsigned char iv[16];
236 /* <encrypted> */
237 unsigned char hash[20];
238 /* <payload /> */
239 /* </encrypted> */
240 };
241 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
243 struct receive_list_entry_s
244 {
245 char *data;
246 int data_len;
247 int fd;
248 struct receive_list_entry_s *next;
249 };
250 typedef struct receive_list_entry_s receive_list_entry_t;
252 /*
253 * Private variables
254 */
255 static int network_config_ttl = 0;
256 static size_t network_config_packet_size = 1024;
257 static int network_config_forward = 0;
259 static sockent_t *sending_sockets = NULL;
261 static receive_list_entry_t *receive_list_head = NULL;
262 static receive_list_entry_t *receive_list_tail = NULL;
263 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
264 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
266 static sockent_t *listen_sockets = NULL;
267 static struct pollfd *listen_sockets_pollfd = NULL;
268 static size_t listen_sockets_num = 0;
270 /* The receive and dispatch threads will run as long as `listen_loop' is set to
271 * zero. */
272 static int listen_loop = 0;
273 static int receive_thread_running = 0;
274 static pthread_t receive_thread_id;
275 static int dispatch_thread_running = 0;
276 static pthread_t dispatch_thread_id;
278 /* Buffer in which to-be-sent network packets are constructed. */
279 static char *send_buffer;
280 static char *send_buffer_ptr;
281 static int send_buffer_fill;
282 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
283 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
285 /*
286 * Private functions
287 */
288 static _Bool check_receive_okay (const value_list_t *vl) /* {{{ */
289 {
290 uint64_t time_sent = 0;
291 int status;
293 status = uc_meta_data_get_unsigned_int (vl,
294 "network:time_sent", &time_sent);
296 /* This is a value we already sent. Don't allow it to be received again in
297 * order to avoid looping. */
298 if ((status == 0) && (time_sent >= ((uint64_t) vl->time)))
299 return (false);
301 return (true);
302 } /* }}} _Bool check_receive_okay */
304 static _Bool check_send_okay (const value_list_t *vl) /* {{{ */
305 {
306 _Bool received = false;
307 int status;
309 if (network_config_forward != 0)
310 return (true);
312 if (vl->meta == NULL)
313 return (true);
315 status = meta_data_get_boolean (vl->meta, "network:received", &received);
316 if (status == -ENOENT)
317 return (true);
318 else if (status != 0)
319 {
320 ERROR ("network plugin: check_send_okay: meta_data_get_boolean failed "
321 "with status %i.", status);
322 return (true);
323 }
325 /* By default, only *send* value lists that were not *received* by the
326 * network plugin. */
327 return (!received);
328 } /* }}} _Bool check_send_okay */
330 static int network_dispatch_values (value_list_t *vl) /* {{{ */
331 {
332 int status;
334 if ((vl->time <= 0)
335 || (strlen (vl->host) <= 0)
336 || (strlen (vl->plugin) <= 0)
337 || (strlen (vl->type) <= 0))
338 return (-EINVAL);
340 if (!check_receive_okay (vl))
341 {
342 #if COLLECT_DEBUG
343 char name[6*DATA_MAX_NAME_LEN];
344 FORMAT_VL (name, sizeof (name), vl);
345 name[sizeof (name) - 1] = 0;
346 DEBUG ("network plugin: network_dispatch_values: "
347 "NOT dispatching %s.", name);
348 #endif
349 return (0);
350 }
352 assert (vl->meta == NULL);
354 vl->meta = meta_data_create ();
355 if (vl->meta == NULL)
356 {
357 ERROR ("network plugin: meta_data_create failed.");
358 return (-ENOMEM);
359 }
361 status = meta_data_add_boolean (vl->meta, "network:received", true);
362 if (status != 0)
363 {
364 ERROR ("network plugin: meta_data_add_boolean failed.");
365 meta_data_destroy (vl->meta);
366 vl->meta = NULL;
367 return (status);
368 }
370 plugin_dispatch_values (vl);
372 meta_data_destroy (vl->meta);
373 vl->meta = NULL;
375 return (0);
376 } /* }}} int network_dispatch_values */
378 #if HAVE_LIBGCRYPT
379 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
380 const void *iv, size_t iv_size, const char *username)
381 {
382 gcry_error_t err;
383 gcry_cipher_hd_t *cyper_ptr;
384 unsigned char password_hash[32];
386 if (se->type == SOCKENT_TYPE_CLIENT)
387 {
388 cyper_ptr = &se->data.client.cypher;
389 memcpy (password_hash, se->data.client.password_hash,
390 sizeof (password_hash));
391 }
392 else
393 {
394 char *secret;
396 cyper_ptr = &se->data.server.cypher;
398 if (username == NULL)
399 return (NULL);
401 secret = fbh_get (se->data.server.userdb, username);
402 if (secret == NULL)
403 return (NULL);
405 gcry_md_hash_buffer (GCRY_MD_SHA256,
406 password_hash,
407 secret, strlen (secret));
409 sfree (secret);
410 }
412 if (*cyper_ptr == NULL)
413 {
414 err = gcry_cipher_open (cyper_ptr,
415 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0);
416 if (err != 0)
417 {
418 ERROR ("network plugin: gcry_cipher_open returned: %s",
419 gcry_strerror (err));
420 *cyper_ptr = NULL;
421 return (NULL);
422 }
423 }
424 else
425 {
426 gcry_cipher_reset (*cyper_ptr);
427 }
428 assert (*cyper_ptr != NULL);
430 err = gcry_cipher_setkey (*cyper_ptr,
431 password_hash, sizeof (password_hash));
432 if (err != 0)
433 {
434 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
435 gcry_strerror (err));
436 gcry_cipher_close (*cyper_ptr);
437 *cyper_ptr = NULL;
438 return (NULL);
439 }
441 err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size);
442 if (err != 0)
443 {
444 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
445 gcry_strerror (err));
446 gcry_cipher_close (*cyper_ptr);
447 *cyper_ptr = NULL;
448 return (NULL);
449 }
451 return (*cyper_ptr);
452 } /* }}} int network_get_aes256_cypher */
453 #endif /* HAVE_LIBGCRYPT */
455 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
456 const data_set_t *ds, const value_list_t *vl)
457 {
458 char *packet_ptr;
459 int packet_len;
460 int num_values;
462 part_header_t pkg_ph;
463 uint16_t pkg_num_values;
464 uint8_t *pkg_values_types;
465 value_t *pkg_values;
467 int offset;
468 int i;
470 num_values = vl->values_len;
471 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
472 + (num_values * sizeof (uint8_t))
473 + (num_values * sizeof (value_t));
475 if (*ret_buffer_len < packet_len)
476 return (-1);
478 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
479 if (pkg_values_types == NULL)
480 {
481 ERROR ("network plugin: write_part_values: malloc failed.");
482 return (-1);
483 }
485 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
486 if (pkg_values == NULL)
487 {
488 free (pkg_values_types);
489 ERROR ("network plugin: write_part_values: malloc failed.");
490 return (-1);
491 }
493 pkg_ph.type = htons (TYPE_VALUES);
494 pkg_ph.length = htons (packet_len);
496 pkg_num_values = htons ((uint16_t) vl->values_len);
498 for (i = 0; i < num_values; i++)
499 {
500 pkg_values_types[i] = (uint8_t) ds->ds[i].type;
501 switch (ds->ds[i].type)
502 {
503 case DS_TYPE_COUNTER:
504 pkg_values[i].counter = htonll (vl->values[i].counter);
505 break;
507 case DS_TYPE_GAUGE:
508 pkg_values[i].gauge = htond (vl->values[i].gauge);
509 break;
511 case DS_TYPE_DERIVE:
512 pkg_values[i].derive = htonll (vl->values[i].derive);
513 break;
515 case DS_TYPE_ABSOLUTE:
516 pkg_values[i].absolute = htonll (vl->values[i].absolute);
517 break;
519 default:
520 free (pkg_values_types);
521 free (pkg_values);
522 ERROR ("network plugin: write_part_values: "
523 "Unknown data source type: %i",
524 ds->ds[i].type);
525 return (-1);
526 } /* switch (ds->ds[i].type) */
527 } /* for (num_values) */
529 /*
530 * Use `memcpy' to write everything to the buffer, because the pointer
531 * may be unaligned and some architectures, such as SPARC, can't handle
532 * that.
533 */
534 packet_ptr = *ret_buffer;
535 offset = 0;
536 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
537 offset += sizeof (pkg_ph);
538 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
539 offset += sizeof (pkg_num_values);
540 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
541 offset += num_values * sizeof (uint8_t);
542 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
543 offset += num_values * sizeof (value_t);
545 assert (offset == packet_len);
547 *ret_buffer = packet_ptr + packet_len;
548 *ret_buffer_len -= packet_len;
550 free (pkg_values_types);
551 free (pkg_values);
553 return (0);
554 } /* int write_part_values */
556 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
557 int type, uint64_t value)
558 {
559 char *packet_ptr;
560 int packet_len;
562 part_header_t pkg_head;
563 uint64_t pkg_value;
565 int offset;
567 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
569 if (*ret_buffer_len < packet_len)
570 return (-1);
572 pkg_head.type = htons (type);
573 pkg_head.length = htons (packet_len);
574 pkg_value = htonll (value);
576 packet_ptr = *ret_buffer;
577 offset = 0;
578 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
579 offset += sizeof (pkg_head);
580 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
581 offset += sizeof (pkg_value);
583 assert (offset == packet_len);
585 *ret_buffer = packet_ptr + packet_len;
586 *ret_buffer_len -= packet_len;
588 return (0);
589 } /* int write_part_number */
591 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
592 int type, const char *str, int str_len)
593 {
594 char *buffer;
595 int buffer_len;
597 uint16_t pkg_type;
598 uint16_t pkg_length;
600 int offset;
602 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
603 if (*ret_buffer_len < buffer_len)
604 return (-1);
606 pkg_type = htons (type);
607 pkg_length = htons (buffer_len);
609 buffer = *ret_buffer;
610 offset = 0;
611 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
612 offset += sizeof (pkg_type);
613 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
614 offset += sizeof (pkg_length);
615 memcpy (buffer + offset, str, str_len);
616 offset += str_len;
617 memset (buffer + offset, '\0', 1);
618 offset += 1;
620 assert (offset == buffer_len);
622 *ret_buffer = buffer + buffer_len;
623 *ret_buffer_len -= buffer_len;
625 return (0);
626 } /* int write_part_string */
628 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
629 value_t **ret_values, int *ret_num_values)
630 {
631 char *buffer = *ret_buffer;
632 size_t buffer_len = *ret_buffer_len;
634 uint16_t tmp16;
635 size_t exp_size;
636 int i;
638 uint16_t pkg_length;
639 uint16_t pkg_type;
640 uint16_t pkg_numval;
642 uint8_t *pkg_types;
643 value_t *pkg_values;
645 if (buffer_len < 15)
646 {
647 NOTICE ("network plugin: packet is too short: "
648 "buffer_len = %zu", buffer_len);
649 return (-1);
650 }
652 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
653 buffer += sizeof (tmp16);
654 pkg_type = ntohs (tmp16);
656 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
657 buffer += sizeof (tmp16);
658 pkg_length = ntohs (tmp16);
660 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
661 buffer += sizeof (tmp16);
662 pkg_numval = ntohs (tmp16);
664 assert (pkg_type == TYPE_VALUES);
666 exp_size = 3 * sizeof (uint16_t)
667 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
668 if ((buffer_len < 0) || (buffer_len < exp_size))
669 {
670 WARNING ("network plugin: parse_part_values: "
671 "Packet too short: "
672 "Chunk of size %zu expected, "
673 "but buffer has only %zu bytes left.",
674 exp_size, buffer_len);
675 return (-1);
676 }
678 if (pkg_length != exp_size)
679 {
680 WARNING ("network plugin: parse_part_values: "
681 "Length and number of values "
682 "in the packet don't match.");
683 return (-1);
684 }
686 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
687 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
688 if ((pkg_types == NULL) || (pkg_values == NULL))
689 {
690 sfree (pkg_types);
691 sfree (pkg_values);
692 ERROR ("network plugin: parse_part_values: malloc failed.");
693 return (-1);
694 }
696 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
697 buffer += pkg_numval * sizeof (uint8_t);
698 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
699 buffer += pkg_numval * sizeof (value_t);
701 for (i = 0; i < pkg_numval; i++)
702 {
703 switch (pkg_types[i])
704 {
705 case DS_TYPE_COUNTER:
706 pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter);
707 break;
709 case DS_TYPE_GAUGE:
710 pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge);
711 break;
713 case DS_TYPE_DERIVE:
714 pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive);
715 break;
717 case DS_TYPE_ABSOLUTE:
718 pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute);
719 break;
721 default:
722 sfree (pkg_types);
723 sfree (pkg_values);
724 NOTICE ("network plugin: parse_part_values: "
725 "Don't know how to handle data source type %"PRIu8,
726 pkg_types[i]);
727 return (-1);
728 } /* switch (pkg_types[i]) */
729 }
731 *ret_buffer = buffer;
732 *ret_buffer_len = buffer_len - pkg_length;
733 *ret_num_values = pkg_numval;
734 *ret_values = pkg_values;
736 sfree (pkg_types);
738 return (0);
739 } /* int parse_part_values */
741 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
742 uint64_t *value)
743 {
744 char *buffer = *ret_buffer;
745 size_t buffer_len = *ret_buffer_len;
747 uint16_t tmp16;
748 uint64_t tmp64;
749 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
751 uint16_t pkg_length;
752 uint16_t pkg_type;
754 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
755 {
756 WARNING ("network plugin: parse_part_number: "
757 "Packet too short: "
758 "Chunk of size %zu expected, "
759 "but buffer has only %zu bytes left.",
760 exp_size, buffer_len);
761 return (-1);
762 }
764 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
765 buffer += sizeof (tmp16);
766 pkg_type = ntohs (tmp16);
768 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
769 buffer += sizeof (tmp16);
770 pkg_length = ntohs (tmp16);
772 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
773 buffer += sizeof (tmp64);
774 *value = ntohll (tmp64);
776 *ret_buffer = buffer;
777 *ret_buffer_len = buffer_len - pkg_length;
779 return (0);
780 } /* int parse_part_number */
782 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
783 char *output, int output_len)
784 {
785 char *buffer = *ret_buffer;
786 size_t buffer_len = *ret_buffer_len;
788 uint16_t tmp16;
789 size_t header_size = 2 * sizeof (uint16_t);
791 uint16_t pkg_length;
792 uint16_t pkg_type;
794 if ((buffer_len < 0) || (buffer_len < header_size))
795 {
796 WARNING ("network plugin: parse_part_string: "
797 "Packet too short: "
798 "Chunk of at least size %zu expected, "
799 "but buffer has only %zu bytes left.",
800 header_size, buffer_len);
801 return (-1);
802 }
804 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
805 buffer += sizeof (tmp16);
806 pkg_type = ntohs (tmp16);
808 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
809 buffer += sizeof (tmp16);
810 pkg_length = ntohs (tmp16);
812 /* Check that packet fits in the input buffer */
813 if (pkg_length > buffer_len)
814 {
815 WARNING ("network plugin: parse_part_string: "
816 "Packet too big: "
817 "Chunk of size %"PRIu16" received, "
818 "but buffer has only %zu bytes left.",
819 pkg_length, buffer_len);
820 return (-1);
821 }
823 /* Check that pkg_length is in the valid range */
824 if (pkg_length <= header_size)
825 {
826 WARNING ("network plugin: parse_part_string: "
827 "Packet too short: "
828 "Header claims this packet is only %hu "
829 "bytes long.", pkg_length);
830 return (-1);
831 }
833 /* Check that the package data fits into the output buffer.
834 * The previous if-statement ensures that:
835 * `pkg_length > header_size' */
836 if ((output_len < 0)
837 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
838 {
839 WARNING ("network plugin: parse_part_string: "
840 "Output buffer too small.");
841 return (-1);
842 }
844 /* All sanity checks successfull, let's copy the data over */
845 output_len = pkg_length - header_size;
846 memcpy ((void *) output, (void *) buffer, output_len);
847 buffer += output_len;
849 /* For some very weird reason '\0' doesn't do the trick on SPARC in
850 * this statement. */
851 if (output[output_len - 1] != 0)
852 {
853 WARNING ("network plugin: parse_part_string: "
854 "Received string does not end "
855 "with a NULL-byte.");
856 return (-1);
857 }
859 *ret_buffer = buffer;
860 *ret_buffer_len = buffer_len - pkg_length;
862 return (0);
863 } /* int parse_part_string */
865 /* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call
866 * parse_packet and vice versa. */
867 #define PP_SIGNED 0x01
868 #define PP_ENCRYPTED 0x02
869 static int parse_packet (sockent_t *se,
870 void *buffer, size_t buffer_size, int flags);
872 #define BUFFER_READ(p,s) do { \
873 memcpy ((p), buffer + buffer_offset, (s)); \
874 buffer_offset += (s); \
875 } while (0)
877 #if HAVE_LIBGCRYPT
878 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
879 void **ret_buffer, size_t *ret_buffer_len, int flags)
880 {
881 char *buffer;
882 size_t buffer_len;
883 size_t buffer_offset;
885 size_t username_len;
886 char *secret;
888 part_signature_sha256_t pss;
889 uint16_t pss_head_length;
890 char hash[sizeof (pss.hash)];
892 gcry_md_hd_t hd;
893 gcry_error_t err;
894 unsigned char *hash_ptr;
896 buffer = *ret_buffer;
897 buffer_len = *ret_buffer_len;
898 buffer_offset = 0;
900 if (se->data.server.userdb == NULL)
901 {
902 NOTICE ("network plugin: Received signed network packet but can't verify "
903 "it because no user DB has been configured. Will accept it.");
904 return (0);
905 }
907 /* Check if the buffer has enough data for this structure. */
908 if (buffer_len <= PART_SIGNATURE_SHA256_SIZE)
909 return (-ENOMEM);
911 /* Read type and length header */
912 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
913 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
914 pss_head_length = ntohs (pss.head.length);
916 /* Check if the `pss_head_length' is within bounds. */
917 if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE)
918 || (pss_head_length > buffer_len))
919 {
920 ERROR ("network plugin: HMAC-SHA-256 with invalid length received.");
921 return (-1);
922 }
924 /* Copy the hash. */
925 BUFFER_READ (pss.hash, sizeof (pss.hash));
927 /* Calculate username length (without null byte) and allocate memory */
928 username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE;
929 pss.username = malloc (username_len + 1);
930 if (pss.username == NULL)
931 return (-ENOMEM);
933 /* Read the username */
934 BUFFER_READ (pss.username, username_len);
935 pss.username[username_len] = 0;
937 assert (buffer_offset == pss_head_length);
939 /* Query the password */
940 secret = fbh_get (se->data.server.userdb, pss.username);
941 if (secret == NULL)
942 {
943 ERROR ("network plugin: Unknown user: %s", pss.username);
944 sfree (pss.username);
945 return (-ENOENT);
946 }
948 /* Create a hash device and check the HMAC */
949 hd = NULL;
950 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
951 if (err != 0)
952 {
953 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
954 gcry_strerror (err));
955 sfree (secret);
956 sfree (pss.username);
957 return (-1);
958 }
960 err = gcry_md_setkey (hd, secret, strlen (secret));
961 if (err != 0)
962 {
963 ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err));
964 gcry_md_close (hd);
965 return (-1);
966 }
968 gcry_md_write (hd,
969 buffer + PART_SIGNATURE_SHA256_SIZE,
970 buffer_len - PART_SIGNATURE_SHA256_SIZE);
971 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
972 if (hash_ptr == NULL)
973 {
974 ERROR ("network plugin: gcry_md_read failed.");
975 gcry_md_close (hd);
976 sfree (secret);
977 sfree (pss.username);
978 return (-1);
979 }
980 memcpy (hash, hash_ptr, sizeof (hash));
982 /* Clean up */
983 gcry_md_close (hd);
984 hd = NULL;
986 sfree (secret);
987 sfree (pss.username);
989 if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0)
990 {
991 WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: "
992 "Hash mismatch.");
993 }
994 else
995 {
996 parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset,
997 flags | PP_SIGNED);
998 }
1000 *ret_buffer = buffer + buffer_len;
1001 *ret_buffer_len = 0;
1003 return (0);
1004 } /* }}} int parse_part_sign_sha256 */
1005 /* #endif HAVE_LIBGCRYPT */
1007 #else /* if !HAVE_LIBGCRYPT */
1008 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1009 void **ret_buffer, size_t *ret_buffer_size, int flags)
1010 {
1011 static int warning_has_been_printed = 0;
1013 char *buffer;
1014 size_t buffer_size;
1015 size_t buffer_offset;
1016 uint16_t part_len;
1018 part_signature_sha256_t pss;
1020 buffer = *ret_buffer;
1021 buffer_size = *ret_buffer_size;
1022 buffer_offset = 0;
1024 if (buffer_size <= PART_SIGNATURE_SHA256_SIZE)
1025 return (-ENOMEM);
1027 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1028 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1029 part_len = ntohs (pss.head.length);
1031 if ((part_len <= PART_SIGNATURE_SHA256_SIZE)
1032 || (part_len > buffer_size))
1033 return (-EINVAL);
1035 if (warning_has_been_printed == 0)
1036 {
1037 WARNING ("network plugin: Received signed packet, but the network "
1038 "plugin was not linked with libgcrypt, so I cannot "
1039 "verify the signature. The packet will be accepted.");
1040 warning_has_been_printed = 1;
1041 }
1043 parse_packet (se, buffer + part_len, buffer_size - part_len, flags);
1045 *ret_buffer = buffer + buffer_size;
1046 *ret_buffer_size = 0;
1048 return (0);
1049 } /* }}} int parse_part_sign_sha256 */
1050 #endif /* !HAVE_LIBGCRYPT */
1052 #if HAVE_LIBGCRYPT
1053 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1054 void **ret_buffer, size_t *ret_buffer_len,
1055 int flags)
1056 {
1057 char *buffer = *ret_buffer;
1058 size_t buffer_len = *ret_buffer_len;
1059 size_t payload_len;
1060 size_t part_size;
1061 size_t buffer_offset;
1062 uint16_t username_len;
1063 part_encryption_aes256_t pea;
1064 unsigned char hash[sizeof (pea.hash)];
1066 gcry_cipher_hd_t cypher;
1067 gcry_error_t err;
1069 /* Make sure at least the header if available. */
1070 if (buffer_len <= PART_ENCRYPTION_AES256_SIZE)
1071 {
1072 NOTICE ("network plugin: parse_part_encr_aes256: "
1073 "Discarding short packet.");
1074 return (-1);
1075 }
1077 buffer_offset = 0;
1079 /* Copy the unencrypted information into `pea'. */
1080 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
1081 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
1083 /* Check the `part size'. */
1084 part_size = ntohs (pea.head.length);
1085 if ((part_size <= PART_ENCRYPTION_AES256_SIZE)
1086 || (part_size > buffer_len))
1087 {
1088 NOTICE ("network plugin: parse_part_encr_aes256: "
1089 "Discarding part with invalid size.");
1090 return (-1);
1091 }
1093 /* Read the username */
1094 BUFFER_READ (&username_len, sizeof (username_len));
1095 username_len = ntohs (username_len);
1097 if ((username_len <= 0)
1098 || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1))))
1099 {
1100 NOTICE ("network plugin: parse_part_encr_aes256: "
1101 "Discarding part with invalid username length.");
1102 return (-1);
1103 }
1105 assert (username_len > 0);
1106 pea.username = malloc (username_len + 1);
1107 if (pea.username == NULL)
1108 return (-ENOMEM);
1109 BUFFER_READ (pea.username, username_len);
1110 pea.username[username_len] = 0;
1112 /* Last but not least, the initialization vector */
1113 BUFFER_READ (pea.iv, sizeof (pea.iv));
1115 /* Make sure we are at the right position */
1116 assert (buffer_offset == (username_len +
1117 PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash)));
1119 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
1120 pea.username);
1121 if (cypher == NULL)
1122 return (-1);
1124 payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len);
1125 assert (payload_len > 0);
1127 /* Decrypt the packet in-place */
1128 err = gcry_cipher_decrypt (cypher,
1129 buffer + buffer_offset,
1130 part_size - buffer_offset,
1131 /* in = */ NULL, /* in len = */ 0);
1132 if (err != 0)
1133 {
1134 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
1135 gcry_strerror (err));
1136 return (-1);
1137 }
1139 /* Read the hash */
1140 BUFFER_READ (pea.hash, sizeof (pea.hash));
1142 /* Make sure we're at the right position - again */
1143 assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE));
1144 assert (buffer_offset == (part_size - payload_len));
1146 /* Check hash sum */
1147 memset (hash, 0, sizeof (hash));
1148 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
1149 buffer + buffer_offset, payload_len);
1150 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
1151 {
1152 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
1153 return (-1);
1154 }
1156 parse_packet (se, buffer + buffer_offset, payload_len,
1157 flags | PP_ENCRYPTED);
1159 /* Update return values */
1160 *ret_buffer = buffer + part_size;
1161 *ret_buffer_len = buffer_len - part_size;
1163 return (0);
1164 } /* }}} int parse_part_encr_aes256 */
1165 /* #endif HAVE_LIBGCRYPT */
1167 #else /* if !HAVE_LIBGCRYPT */
1168 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1169 void **ret_buffer, size_t *ret_buffer_size, int flags)
1170 {
1171 static int warning_has_been_printed = 0;
1173 char *buffer;
1174 size_t buffer_size;
1175 size_t buffer_offset;
1177 part_header_t ph;
1178 size_t ph_length;
1180 buffer = *ret_buffer;
1181 buffer_size = *ret_buffer_size;
1182 buffer_offset = 0;
1184 /* parse_packet assures this minimum size. */
1185 assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length)));
1187 BUFFER_READ (&ph.type, sizeof (ph.type));
1188 BUFFER_READ (&ph.length, sizeof (ph.length));
1189 ph_length = ntohs (ph.length);
1191 if ((ph_length <= PART_ENCRYPTION_AES256_SIZE)
1192 || (ph_length > buffer_size))
1193 {
1194 ERROR ("network plugin: AES-256 encrypted part "
1195 "with invalid length received.");
1196 return (-1);
1197 }
1199 if (warning_has_been_printed == 0)
1200 {
1201 WARNING ("network plugin: Received encrypted packet, but the network "
1202 "plugin was not linked with libgcrypt, so I cannot "
1203 "decrypt it. The part will be discarded.");
1204 warning_has_been_printed = 1;
1205 }
1207 *ret_buffer += ph_length;
1208 *ret_buffer_size -= ph_length;
1210 return (0);
1211 } /* }}} int parse_part_encr_aes256 */
1212 #endif /* !HAVE_LIBGCRYPT */
1214 #undef BUFFER_READ
1216 static int parse_packet (sockent_t *se, /* {{{ */
1217 void *buffer, size_t buffer_size, int flags)
1218 {
1219 int status;
1221 value_list_t vl = VALUE_LIST_INIT;
1222 notification_t n;
1224 #if HAVE_LIBGCRYPT
1225 int packet_was_signed = (flags & PP_SIGNED);
1226 int packet_was_encrypted = (flags & PP_ENCRYPTED);
1227 int printed_ignore_warning = 0;
1228 #endif /* HAVE_LIBGCRYPT */
1231 memset (&vl, '\0', sizeof (vl));
1232 memset (&n, '\0', sizeof (n));
1233 status = 0;
1235 while ((status == 0) && (0 < buffer_size)
1236 && ((unsigned int) buffer_size > sizeof (part_header_t)))
1237 {
1238 uint16_t pkg_length;
1239 uint16_t pkg_type;
1241 memcpy ((void *) &pkg_type,
1242 (void *) buffer,
1243 sizeof (pkg_type));
1244 memcpy ((void *) &pkg_length,
1245 (void *) (buffer + sizeof (pkg_type)),
1246 sizeof (pkg_length));
1248 pkg_length = ntohs (pkg_length);
1249 pkg_type = ntohs (pkg_type);
1251 if (pkg_length > buffer_size)
1252 break;
1253 /* Ensure that this loop terminates eventually */
1254 if (pkg_length < (2 * sizeof (uint16_t)))
1255 break;
1257 if (pkg_type == TYPE_ENCR_AES256)
1258 {
1259 status = parse_part_encr_aes256 (se,
1260 &buffer, &buffer_size, flags);
1261 if (status != 0)
1262 {
1263 ERROR ("network plugin: Decrypting AES256 "
1264 "part failed "
1265 "with status %i.", status);
1266 break;
1267 }
1268 }
1269 #if HAVE_LIBGCRYPT
1270 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
1271 && (packet_was_encrypted == 0))
1272 {
1273 if (printed_ignore_warning == 0)
1274 {
1275 INFO ("network plugin: Unencrypted packet or "
1276 "part has been ignored.");
1277 printed_ignore_warning = 1;
1278 }
1279 buffer = ((char *) buffer) + pkg_length;
1280 continue;
1281 }
1282 #endif /* HAVE_LIBGCRYPT */
1283 else if (pkg_type == TYPE_SIGN_SHA256)
1284 {
1285 status = parse_part_sign_sha256 (se,
1286 &buffer, &buffer_size, flags);
1287 if (status != 0)
1288 {
1289 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1290 "signature failed "
1291 "with status %i.", status);
1292 break;
1293 }
1294 }
1295 #if HAVE_LIBGCRYPT
1296 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
1297 && (packet_was_encrypted == 0)
1298 && (packet_was_signed == 0))
1299 {
1300 if (printed_ignore_warning == 0)
1301 {
1302 INFO ("network plugin: Unsigned packet or "
1303 "part has been ignored.");
1304 printed_ignore_warning = 1;
1305 }
1306 buffer = ((char *) buffer) + pkg_length;
1307 continue;
1308 }
1309 #endif /* HAVE_LIBGCRYPT */
1310 else if (pkg_type == TYPE_VALUES)
1311 {
1312 status = parse_part_values (&buffer, &buffer_size,
1313 &vl.values, &vl.values_len);
1314 if (status != 0)
1315 break;
1317 network_dispatch_values (&vl);
1319 sfree (vl.values);
1320 }
1321 else if (pkg_type == TYPE_TIME)
1322 {
1323 uint64_t tmp = 0;
1324 status = parse_part_number (&buffer, &buffer_size,
1325 &tmp);
1326 if (status == 0)
1327 {
1328 vl.time = (time_t) tmp;
1329 n.time = (time_t) tmp;
1330 }
1331 }
1332 else if (pkg_type == TYPE_INTERVAL)
1333 {
1334 uint64_t tmp = 0;
1335 status = parse_part_number (&buffer, &buffer_size,
1336 &tmp);
1337 if (status == 0)
1338 vl.interval = (int) tmp;
1339 }
1340 else if (pkg_type == TYPE_HOST)
1341 {
1342 status = parse_part_string (&buffer, &buffer_size,
1343 vl.host, sizeof (vl.host));
1344 if (status == 0)
1345 sstrncpy (n.host, vl.host, sizeof (n.host));
1346 }
1347 else if (pkg_type == TYPE_PLUGIN)
1348 {
1349 status = parse_part_string (&buffer, &buffer_size,
1350 vl.plugin, sizeof (vl.plugin));
1351 if (status == 0)
1352 sstrncpy (n.plugin, vl.plugin,
1353 sizeof (n.plugin));
1354 }
1355 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1356 {
1357 status = parse_part_string (&buffer, &buffer_size,
1358 vl.plugin_instance,
1359 sizeof (vl.plugin_instance));
1360 if (status == 0)
1361 sstrncpy (n.plugin_instance,
1362 vl.plugin_instance,
1363 sizeof (n.plugin_instance));
1364 }
1365 else if (pkg_type == TYPE_TYPE)
1366 {
1367 status = parse_part_string (&buffer, &buffer_size,
1368 vl.type, sizeof (vl.type));
1369 if (status == 0)
1370 sstrncpy (n.type, vl.type, sizeof (n.type));
1371 }
1372 else if (pkg_type == TYPE_TYPE_INSTANCE)
1373 {
1374 status = parse_part_string (&buffer, &buffer_size,
1375 vl.type_instance,
1376 sizeof (vl.type_instance));
1377 if (status == 0)
1378 sstrncpy (n.type_instance, vl.type_instance,
1379 sizeof (n.type_instance));
1380 }
1381 else if (pkg_type == TYPE_MESSAGE)
1382 {
1383 status = parse_part_string (&buffer, &buffer_size,
1384 n.message, sizeof (n.message));
1386 if (status != 0)
1387 {
1388 /* do nothing */
1389 }
1390 else if ((n.severity != NOTIF_FAILURE)
1391 && (n.severity != NOTIF_WARNING)
1392 && (n.severity != NOTIF_OKAY))
1393 {
1394 INFO ("network plugin: "
1395 "Ignoring notification with "
1396 "unknown severity %i.",
1397 n.severity);
1398 }
1399 else if (n.time <= 0)
1400 {
1401 INFO ("network plugin: "
1402 "Ignoring notification with "
1403 "time == 0.");
1404 }
1405 else if (strlen (n.message) <= 0)
1406 {
1407 INFO ("network plugin: "
1408 "Ignoring notification with "
1409 "an empty message.");
1410 }
1411 else
1412 {
1413 plugin_dispatch_notification (&n);
1414 }
1415 }
1416 else if (pkg_type == TYPE_SEVERITY)
1417 {
1418 uint64_t tmp = 0;
1419 status = parse_part_number (&buffer, &buffer_size,
1420 &tmp);
1421 if (status == 0)
1422 n.severity = (int) tmp;
1423 }
1424 else
1425 {
1426 DEBUG ("network plugin: parse_packet: Unknown part"
1427 " type: 0x%04hx", pkg_type);
1428 buffer = ((char *) buffer) + pkg_length;
1429 }
1430 } /* while (buffer_size > sizeof (part_header_t)) */
1432 if (status == 0 && buffer_size > 0)
1433 WARNING ("network plugin: parse_packet: Received truncated "
1434 "packet, try increasing `MaxPacketSize'");
1436 return (status);
1437 } /* }}} int parse_packet */
1439 static void free_sockent_client (struct sockent_client *sec) /* {{{ */
1440 {
1441 if (sec->fd >= 0)
1442 {
1443 close (sec->fd);
1444 sec->fd = -1;
1445 }
1446 sfree (sec->addr);
1447 #if HAVE_LIBGCRYPT
1448 sfree (sec->username);
1449 sfree (sec->password);
1450 if (sec->cypher != NULL)
1451 gcry_cipher_close (sec->cypher);
1452 #endif
1453 } /* }}} void free_sockent_client */
1455 static void free_sockent_server (struct sockent_server *ses) /* {{{ */
1456 {
1457 size_t i;
1459 for (i = 0; i < ses->fd_num; i++)
1460 {
1461 if (ses->fd[i] >= 0)
1462 {
1463 close (ses->fd[i]);
1464 ses->fd[i] = -1;
1465 }
1466 }
1468 sfree (ses->fd);
1469 #if HAVE_LIBGCRYPT
1470 sfree (ses->auth_file);
1471 fbh_destroy (ses->userdb);
1472 if (ses->cypher != NULL)
1473 gcry_cipher_close (ses->cypher);
1474 #endif
1475 } /* }}} void free_sockent_server */
1477 static void sockent_destroy (sockent_t *se) /* {{{ */
1478 {
1479 sockent_t *next;
1481 DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se);
1483 while (se != NULL)
1484 {
1485 next = se->next;
1487 sfree (se->node);
1488 sfree (se->service);
1490 if (se->type == SOCKENT_TYPE_CLIENT)
1491 free_sockent_client (&se->data.client);
1492 else
1493 free_sockent_server (&se->data.server);
1495 sfree (se);
1496 se = next;
1497 }
1498 } /* }}} void sockent_destroy */
1500 /*
1501 * int network_set_ttl
1502 *
1503 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1504 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1505 *
1506 * The `struct addrinfo' is used to destinguish between unicast and multicast
1507 * sockets.
1508 */
1509 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1510 {
1511 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1512 network_config_ttl);
1514 assert (se->type == SOCKENT_TYPE_CLIENT);
1516 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1517 return (-1);
1519 if (ai->ai_family == AF_INET)
1520 {
1521 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1522 int optname;
1524 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1525 optname = IP_MULTICAST_TTL;
1526 else
1527 optname = IP_TTL;
1529 if (setsockopt (se->data.client.fd, IPPROTO_IP, optname,
1530 &network_config_ttl,
1531 sizeof (network_config_ttl)) == -1)
1532 {
1533 char errbuf[1024];
1534 ERROR ("setsockopt: %s",
1535 sstrerror (errno, errbuf, sizeof (errbuf)));
1536 return (-1);
1537 }
1538 }
1539 else if (ai->ai_family == AF_INET6)
1540 {
1541 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1542 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1543 int optname;
1545 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1546 optname = IPV6_MULTICAST_HOPS;
1547 else
1548 optname = IPV6_UNICAST_HOPS;
1550 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname,
1551 &network_config_ttl,
1552 sizeof (network_config_ttl)) == -1)
1553 {
1554 char errbuf[1024];
1555 ERROR ("setsockopt: %s",
1556 sstrerror (errno, errbuf,
1557 sizeof (errbuf)));
1558 return (-1);
1559 }
1560 }
1562 return (0);
1563 } /* int network_set_ttl */
1565 static int network_bind_socket (int fd, const struct addrinfo *ai)
1566 {
1567 int loop = 0;
1568 int yes = 1;
1570 /* allow multiple sockets to use the same PORT number */
1571 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
1572 &yes, sizeof(yes)) == -1) {
1573 char errbuf[1024];
1574 ERROR ("setsockopt: %s",
1575 sstrerror (errno, errbuf, sizeof (errbuf)));
1576 return (-1);
1577 }
1579 DEBUG ("fd = %i; calling `bind'", fd);
1581 if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1)
1582 {
1583 char errbuf[1024];
1584 ERROR ("bind: %s",
1585 sstrerror (errno, errbuf, sizeof (errbuf)));
1586 return (-1);
1587 }
1589 if (ai->ai_family == AF_INET)
1590 {
1591 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1592 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1593 {
1594 struct ip_mreq mreq;
1596 DEBUG ("fd = %i; IPv4 multicast address found", fd);
1598 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1599 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
1601 if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1602 &loop, sizeof (loop)) == -1)
1603 {
1604 char errbuf[1024];
1605 ERROR ("setsockopt: %s",
1606 sstrerror (errno, errbuf,
1607 sizeof (errbuf)));
1608 return (-1);
1609 }
1611 if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1612 &mreq, sizeof (mreq)) == -1)
1613 {
1614 char errbuf[1024];
1615 ERROR ("setsockopt: %s",
1616 sstrerror (errno, errbuf,
1617 sizeof (errbuf)));
1618 return (-1);
1619 }
1620 }
1621 }
1622 else if (ai->ai_family == AF_INET6)
1623 {
1624 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1625 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1626 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1627 {
1628 struct ipv6_mreq mreq;
1630 DEBUG ("fd = %i; IPv6 multicast address found", fd);
1632 memcpy (&mreq.ipv6mr_multiaddr,
1633 &addr->sin6_addr,
1634 sizeof (addr->sin6_addr));
1636 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1637 * ipv6mr_interface may be set to zeroes to
1638 * choose the default multicast interface or to
1639 * the index of a particular multicast-capable
1640 * interface if the host is multihomed.
1641 * Membership is associ-associated with a
1642 * single interface; programs running on
1643 * multihomed hosts may need to join the same
1644 * group on more than one interface.*/
1645 mreq.ipv6mr_interface = 0;
1647 if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1648 &loop, sizeof (loop)) == -1)
1649 {
1650 char errbuf[1024];
1651 ERROR ("setsockopt: %s",
1652 sstrerror (errno, errbuf,
1653 sizeof (errbuf)));
1654 return (-1);
1655 }
1657 if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1658 &mreq, sizeof (mreq)) == -1)
1659 {
1660 char errbuf[1024];
1661 ERROR ("setsockopt: %s",
1662 sstrerror (errno, errbuf,
1663 sizeof (errbuf)));
1664 return (-1);
1665 }
1666 }
1667 }
1669 return (0);
1670 } /* int network_bind_socket */
1672 /* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT'
1673 * or `SOCKENT_TYPE_SERVER' */
1674 static int sockent_init (sockent_t *se, int type) /* {{{ */
1675 {
1676 if (se == NULL)
1677 return (-1);
1679 memset (se, 0, sizeof (*se));
1681 se->type = SOCKENT_TYPE_CLIENT;
1682 se->node = NULL;
1683 se->service = NULL;
1684 se->next = NULL;
1686 if (type == SOCKENT_TYPE_SERVER)
1687 {
1688 se->type = SOCKENT_TYPE_SERVER;
1689 se->data.server.fd = NULL;
1690 #if HAVE_LIBGCRYPT
1691 se->data.server.security_level = SECURITY_LEVEL_NONE;
1692 se->data.server.auth_file = NULL;
1693 se->data.server.userdb = NULL;
1694 se->data.server.cypher = NULL;
1695 #endif
1696 }
1697 else
1698 {
1699 se->data.client.fd = -1;
1700 se->data.client.addr = NULL;
1701 #if HAVE_LIBGCRYPT
1702 se->data.client.security_level = SECURITY_LEVEL_NONE;
1703 se->data.client.username = NULL;
1704 se->data.client.password = NULL;
1705 se->data.client.cypher = NULL;
1706 #endif
1707 }
1709 return (0);
1710 } /* }}} int sockent_init */
1712 /* Open the file descriptors for a initialized sockent structure. */
1713 static int sockent_open (sockent_t *se) /* {{{ */
1714 {
1715 struct addrinfo ai_hints;
1716 struct addrinfo *ai_list, *ai_ptr;
1717 int ai_return;
1719 const char *node;
1720 const char *service;
1722 if (se == NULL)
1723 return (-1);
1725 /* Set up the security structures. */
1726 #if HAVE_LIBGCRYPT /* {{{ */
1727 if (se->type == SOCKENT_TYPE_CLIENT)
1728 {
1729 if (se->data.client.security_level > SECURITY_LEVEL_NONE)
1730 {
1731 if ((se->data.client.username == NULL)
1732 || (se->data.client.password == NULL))
1733 {
1734 ERROR ("network plugin: Client socket with "
1735 "security requested, but no "
1736 "credentials are configured.");
1737 return (-1);
1738 }
1739 gcry_md_hash_buffer (GCRY_MD_SHA256,
1740 se->data.client.password_hash,
1741 se->data.client.password,
1742 strlen (se->data.client.password));
1743 }
1744 }
1745 else /* (se->type == SOCKENT_TYPE_SERVER) */
1746 {
1747 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1748 {
1749 if (se->data.server.auth_file == NULL)
1750 {
1751 ERROR ("network plugin: Server socket with "
1752 "security requested, but no "
1753 "password file is configured.");
1754 return (-1);
1755 }
1756 }
1757 if (se->data.server.auth_file != NULL)
1758 {
1759 se->data.server.userdb = fbh_create (se->data.server.auth_file);
1760 if (se->data.server.userdb == NULL)
1761 {
1762 ERROR ("network plugin: Reading password file "
1763 "`%s' failed.",
1764 se->data.server.auth_file);
1765 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1766 return (-1);
1767 }
1768 }
1769 }
1770 #endif /* }}} HAVE_LIBGCRYPT */
1772 node = se->node;
1773 service = se->service;
1775 if (service == NULL)
1776 service = NET_DEFAULT_PORT;
1778 DEBUG ("network plugin: sockent_open: node = %s; service = %s;",
1779 node, service);
1781 memset (&ai_hints, 0, sizeof (ai_hints));
1782 ai_hints.ai_flags = 0;
1783 #ifdef AI_PASSIVE
1784 ai_hints.ai_flags |= AI_PASSIVE;
1785 #endif
1786 #ifdef AI_ADDRCONFIG
1787 ai_hints.ai_flags |= AI_ADDRCONFIG;
1788 #endif
1789 ai_hints.ai_family = AF_UNSPEC;
1790 ai_hints.ai_socktype = SOCK_DGRAM;
1791 ai_hints.ai_protocol = IPPROTO_UDP;
1793 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1794 if (ai_return != 0)
1795 {
1796 ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s",
1797 (se->node == NULL) ? "(null)" : se->node,
1798 (se->service == NULL) ? "(null)" : se->service,
1799 gai_strerror (ai_return));
1800 return (-1);
1801 }
1803 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1804 {
1805 int status;
1807 if (se->type == SOCKENT_TYPE_SERVER) /* {{{ */
1808 {
1809 int *tmp;
1811 tmp = realloc (se->data.server.fd,
1812 sizeof (*tmp) * (se->data.server.fd_num + 1));
1813 if (tmp == NULL)
1814 {
1815 ERROR ("network plugin: realloc failed.");
1816 continue;
1817 }
1818 se->data.server.fd = tmp;
1819 tmp = se->data.server.fd + se->data.server.fd_num;
1821 *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
1822 ai_ptr->ai_protocol);
1823 if (*tmp < 0)
1824 {
1825 char errbuf[1024];
1826 ERROR ("network plugin: socket(2) failed: %s",
1827 sstrerror (errno, errbuf,
1828 sizeof (errbuf)));
1829 continue;
1830 }
1832 status = network_bind_socket (*tmp, ai_ptr);
1833 if (status != 0)
1834 {
1835 close (*tmp);
1836 *tmp = -1;
1837 continue;
1838 }
1840 se->data.server.fd_num++;
1841 continue;
1842 } /* }}} if (se->type == SOCKENT_TYPE_SERVER) */
1843 else /* if (se->type == SOCKENT_TYPE_CLIENT) {{{ */
1844 {
1845 se->data.client.fd = socket (ai_ptr->ai_family,
1846 ai_ptr->ai_socktype,
1847 ai_ptr->ai_protocol);
1848 if (se->data.client.fd < 0)
1849 {
1850 char errbuf[1024];
1851 ERROR ("network plugin: socket(2) failed: %s",
1852 sstrerror (errno, errbuf,
1853 sizeof (errbuf)));
1854 continue;
1855 }
1857 se->data.client.addr = malloc (sizeof (*se->data.client.addr));
1858 if (se->data.client.addr == NULL)
1859 {
1860 ERROR ("network plugin: malloc failed.");
1861 close (se->data.client.fd);
1862 se->data.client.fd = -1;
1863 continue;
1864 }
1866 memset (se->data.client.addr, 0, sizeof (*se->data.client.addr));
1867 assert (sizeof (*se->data.client.addr) >= ai_ptr->ai_addrlen);
1868 memcpy (se->data.client.addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1869 se->data.client.addrlen = ai_ptr->ai_addrlen;
1871 network_set_ttl (se, ai_ptr);
1873 /* We don't open more than one write-socket per
1874 * node/service pair.. */
1875 break;
1876 } /* }}} if (se->type == SOCKENT_TYPE_CLIENT) */
1877 } /* for (ai_list) */
1879 freeaddrinfo (ai_list);
1881 /* Check if all went well. */
1882 if (se->type == SOCKENT_TYPE_SERVER)
1883 {
1884 if (se->data.server.fd_num <= 0)
1885 return (-1);
1886 }
1887 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
1888 {
1889 if (se->data.client.fd < 0)
1890 return (-1);
1891 }
1893 return (0);
1894 } /* }}} int sockent_open */
1896 /* Add a sockent to the global list of sockets */
1897 static int sockent_add (sockent_t *se) /* {{{ */
1898 {
1899 sockent_t *last_ptr;
1901 if (se == NULL)
1902 return (-1);
1904 if (se->type == SOCKENT_TYPE_SERVER)
1905 {
1906 struct pollfd *tmp;
1907 size_t i;
1909 tmp = realloc (listen_sockets_pollfd,
1910 sizeof (*tmp) * (listen_sockets_num
1911 + se->data.server.fd_num));
1912 if (tmp == NULL)
1913 {
1914 ERROR ("network plugin: realloc failed.");
1915 return (-1);
1916 }
1917 listen_sockets_pollfd = tmp;
1918 tmp = listen_sockets_pollfd + listen_sockets_num;
1920 for (i = 0; i < se->data.server.fd_num; i++)
1921 {
1922 memset (tmp + i, 0, sizeof (*tmp));
1923 tmp[i].fd = se->data.server.fd[i];
1924 tmp[i].events = POLLIN | POLLPRI;
1925 tmp[i].revents = 0;
1926 }
1928 listen_sockets_num += se->data.server.fd_num;
1930 if (listen_sockets == NULL)
1931 {
1932 listen_sockets = se;
1933 return (0);
1934 }
1935 last_ptr = listen_sockets;
1936 }
1937 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
1938 {
1939 if (sending_sockets == NULL)
1940 {
1941 sending_sockets = se;
1942 return (0);
1943 }
1944 last_ptr = sending_sockets;
1945 }
1947 while (last_ptr->next != NULL)
1948 last_ptr = last_ptr->next;
1949 last_ptr->next = se;
1951 return (0);
1952 } /* }}} int sockent_add */
1954 static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */
1955 {
1956 while (42)
1957 {
1958 receive_list_entry_t *ent;
1959 sockent_t *se;
1961 /* Lock and wait for more data to come in */
1962 pthread_mutex_lock (&receive_list_lock);
1963 while ((listen_loop == 0)
1964 && (receive_list_head == NULL))
1965 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1967 /* Remove the head entry and unlock */
1968 ent = receive_list_head;
1969 if (ent != NULL)
1970 receive_list_head = ent->next;
1971 pthread_mutex_unlock (&receive_list_lock);
1973 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1974 * because we dispatch all missing packets before shutting down. */
1975 if (ent == NULL)
1976 break;
1978 /* Look for the correct `sockent_t' */
1979 se = listen_sockets;
1980 while (se != NULL)
1981 {
1982 size_t i;
1984 for (i = 0; i < se->data.server.fd_num; i++)
1985 if (se->data.server.fd[i] == ent->fd)
1986 break;
1988 if (i < se->data.server.fd_num)
1989 break;
1991 se = se->next;
1992 }
1994 if (se == NULL)
1995 {
1996 ERROR ("network plugin: Got packet from FD %i, but can't "
1997 "find an appropriate socket entry.",
1998 ent->fd);
1999 sfree (ent->data);
2000 sfree (ent);
2001 continue;
2002 }
2004 parse_packet (se, ent->data, ent->data_len, /* flags = */ 0);
2005 sfree (ent->data);
2006 sfree (ent);
2007 } /* while (42) */
2009 return (NULL);
2010 } /* }}} void *dispatch_thread */
2012 static int network_receive (void) /* {{{ */
2013 {
2014 char buffer[network_config_packet_size];
2015 int buffer_len;
2017 int i;
2018 int status;
2020 receive_list_entry_t *private_list_head;
2021 receive_list_entry_t *private_list_tail;
2023 assert (listen_sockets_num > 0);
2025 private_list_head = NULL;
2026 private_list_tail = NULL;
2028 while (listen_loop == 0)
2029 {
2030 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
2032 if (status <= 0)
2033 {
2034 char errbuf[1024];
2035 if (errno == EINTR)
2036 continue;
2037 ERROR ("poll failed: %s",
2038 sstrerror (errno, errbuf, sizeof (errbuf)));
2039 return (-1);
2040 }
2042 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
2043 {
2044 receive_list_entry_t *ent;
2046 if ((listen_sockets_pollfd[i].revents
2047 & (POLLIN | POLLPRI)) == 0)
2048 continue;
2049 status--;
2051 buffer_len = recv (listen_sockets_pollfd[i].fd,
2052 buffer, sizeof (buffer),
2053 0 /* no flags */);
2054 if (buffer_len < 0)
2055 {
2056 char errbuf[1024];
2057 ERROR ("recv failed: %s",
2058 sstrerror (errno, errbuf,
2059 sizeof (errbuf)));
2060 return (-1);
2061 }
2063 /* TODO: Possible performance enhancement: Do not free
2064 * these entries in the dispatch thread but put them in
2065 * another list, so we don't have to allocate more and
2066 * more of these structures. */
2067 ent = malloc (sizeof (receive_list_entry_t));
2068 if (ent == NULL)
2069 {
2070 ERROR ("network plugin: malloc failed.");
2071 return (-1);
2072 }
2073 memset (ent, 0, sizeof (receive_list_entry_t));
2074 ent->data = malloc (network_config_packet_size);
2075 if (ent->data == NULL)
2076 {
2077 ERROR ("network plugin: malloc failed.");
2078 return (-1);
2079 }
2080 ent->fd = listen_sockets_pollfd[i].fd;
2081 ent->next = NULL;
2083 memcpy (ent->data, buffer, buffer_len);
2084 ent->data_len = buffer_len;
2086 if (private_list_head == NULL)
2087 private_list_head = ent;
2088 else
2089 private_list_tail->next = ent;
2090 private_list_tail = ent;
2092 /* Do not block here. Blocking here has led to
2093 * insufficient performance in the past. */
2094 if (pthread_mutex_trylock (&receive_list_lock) == 0)
2095 {
2096 if (receive_list_head == NULL)
2097 receive_list_head = private_list_head;
2098 else
2099 receive_list_tail->next = private_list_head;
2100 receive_list_tail = private_list_tail;
2102 private_list_head = NULL;
2103 private_list_tail = NULL;
2105 pthread_cond_signal (&receive_list_cond);
2106 pthread_mutex_unlock (&receive_list_lock);
2107 }
2108 } /* for (listen_sockets_pollfd) */
2109 } /* while (listen_loop == 0) */
2111 /* Make sure everything is dispatched before exiting. */
2112 if (private_list_head != NULL)
2113 {
2114 pthread_mutex_lock (&receive_list_lock);
2116 if (receive_list_head == NULL)
2117 receive_list_head = private_list_head;
2118 else
2119 receive_list_tail->next = private_list_head;
2120 receive_list_tail = private_list_tail;
2122 private_list_head = NULL;
2123 private_list_tail = NULL;
2125 pthread_cond_signal (&receive_list_cond);
2126 pthread_mutex_unlock (&receive_list_lock);
2127 }
2129 return (0);
2130 } /* }}} int network_receive */
2132 static void *receive_thread (void __attribute__((unused)) *arg)
2133 {
2134 return (network_receive () ? (void *) 1 : (void *) 0);
2135 } /* void *receive_thread */
2137 static void network_init_buffer (void)
2138 {
2139 memset (send_buffer, 0, network_config_packet_size);
2140 send_buffer_ptr = send_buffer;
2141 send_buffer_fill = 0;
2143 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
2144 } /* int network_init_buffer */
2146 static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */
2147 const char *buffer, size_t buffer_size)
2148 {
2149 int status;
2151 while (42)
2152 {
2153 status = sendto (se->data.client.fd, buffer, buffer_size,
2154 /* flags = */ 0,
2155 (struct sockaddr *) se->data.client.addr,
2156 se->data.client.addrlen);
2157 if (status < 0)
2158 {
2159 char errbuf[1024];
2160 if (errno == EINTR)
2161 continue;
2162 ERROR ("network plugin: sendto failed: %s",
2163 sstrerror (errno, errbuf,
2164 sizeof (errbuf)));
2165 break;
2166 }
2168 break;
2169 } /* while (42) */
2170 } /* }}} void networt_send_buffer_plain */
2172 #if HAVE_LIBGCRYPT
2173 #define BUFFER_ADD(p,s) do { \
2174 memcpy (buffer + buffer_offset, (p), (s)); \
2175 buffer_offset += (s); \
2176 } while (0)
2178 static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */
2179 const char *in_buffer, size_t in_buffer_size)
2180 {
2181 part_signature_sha256_t ps;
2182 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2183 size_t buffer_offset;
2184 size_t username_len;
2186 gcry_md_hd_t hd;
2187 gcry_error_t err;
2188 unsigned char *hash;
2190 hd = NULL;
2191 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
2192 if (err != 0)
2193 {
2194 ERROR ("network plugin: Creating HMAC object failed: %s",
2195 gcry_strerror (err));
2196 return;
2197 }
2199 err = gcry_md_setkey (hd, se->data.client.password,
2200 strlen (se->data.client.password));
2201 if (err != 0)
2202 {
2203 ERROR ("network plugin: gcry_md_setkey failed: %s",
2204 gcry_strerror (err));
2205 gcry_md_close (hd);
2206 return;
2207 }
2209 username_len = strlen (se->data.client.username);
2210 if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE))
2211 {
2212 ERROR ("network plugin: Username too long: %s",
2213 se->data.client.username);
2214 return;
2215 }
2217 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE,
2218 se->data.client.username, username_len);
2219 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len,
2220 in_buffer, in_buffer_size);
2222 /* Initialize the `ps' structure. */
2223 memset (&ps, 0, sizeof (ps));
2224 ps.head.type = htons (TYPE_SIGN_SHA256);
2225 ps.head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len);
2227 /* Calculate the hash value. */
2228 gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE,
2229 username_len + in_buffer_size);
2230 hash = gcry_md_read (hd, GCRY_MD_SHA256);
2231 if (hash == NULL)
2232 {
2233 ERROR ("network plugin: gcry_md_read failed.");
2234 gcry_md_close (hd);
2235 return;
2236 }
2237 memcpy (ps.hash, hash, sizeof (ps.hash));
2239 /* Add the header */
2240 buffer_offset = 0;
2242 BUFFER_ADD (&ps.head.type, sizeof (ps.head.type));
2243 BUFFER_ADD (&ps.head.length, sizeof (ps.head.length));
2244 BUFFER_ADD (ps.hash, sizeof (ps.hash));
2246 assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE);
2248 gcry_md_close (hd);
2249 hd = NULL;
2251 buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size;
2252 networt_send_buffer_plain (se, buffer, buffer_offset);
2253 } /* }}} void networt_send_buffer_signed */
2255 static void networt_send_buffer_encrypted (sockent_t *se, /* {{{ */
2256 const char *in_buffer, size_t in_buffer_size)
2257 {
2258 part_encryption_aes256_t pea;
2259 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2260 size_t buffer_size;
2261 size_t buffer_offset;
2262 size_t header_size;
2263 size_t username_len;
2264 gcry_error_t err;
2265 gcry_cipher_hd_t cypher;
2267 /* Initialize the header fields */
2268 memset (&pea, 0, sizeof (pea));
2269 pea.head.type = htons (TYPE_ENCR_AES256);
2271 pea.username = se->data.client.username;
2273 username_len = strlen (pea.username);
2274 if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE)
2275 {
2276 ERROR ("network plugin: Username too long: %s", pea.username);
2277 return;
2278 }
2280 buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size;
2281 header_size = PART_ENCRYPTION_AES256_SIZE + username_len
2282 - sizeof (pea.hash);
2284 assert (buffer_size <= sizeof (buffer));
2285 DEBUG ("network plugin: networt_send_buffer_encrypted: "
2286 "buffer_size = %zu;", buffer_size);
2288 pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE
2289 + username_len + in_buffer_size));
2290 pea.username_length = htons ((uint16_t) username_len);
2292 /* Chose a random initialization vector. */
2293 gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2295 /* Create hash of the payload */
2296 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2298 /* Initialize the buffer */
2299 buffer_offset = 0;
2300 memset (buffer, 0, sizeof (buffer));
2303 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2304 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2305 BUFFER_ADD (&pea.username_length, sizeof (pea.username_length));
2306 BUFFER_ADD (pea.username, username_len);
2307 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2308 assert (buffer_offset == header_size);
2309 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2310 BUFFER_ADD (in_buffer, in_buffer_size);
2312 assert (buffer_offset == buffer_size);
2314 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
2315 se->data.client.password);
2316 if (cypher == NULL)
2317 return;
2319 /* Encrypt the buffer in-place */
2320 err = gcry_cipher_encrypt (cypher,
2321 buffer + header_size,
2322 buffer_size - header_size,
2323 /* in = */ NULL, /* in len = */ 0);
2324 if (err != 0)
2325 {
2326 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2327 gcry_strerror (err));
2328 return;
2329 }
2331 /* Send it out without further modifications */
2332 networt_send_buffer_plain (se, buffer, buffer_size);
2333 } /* }}} void networt_send_buffer_encrypted */
2334 #undef BUFFER_ADD
2335 #endif /* HAVE_LIBGCRYPT */
2337 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2338 {
2339 sockent_t *se;
2341 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2343 for (se = sending_sockets; se != NULL; se = se->next)
2344 {
2345 #if HAVE_LIBGCRYPT
2346 if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT)
2347 networt_send_buffer_encrypted (se, buffer, buffer_len);
2348 else if (se->data.client.security_level == SECURITY_LEVEL_SIGN)
2349 networt_send_buffer_signed (se, buffer, buffer_len);
2350 else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */
2351 #endif /* HAVE_LIBGCRYPT */
2352 networt_send_buffer_plain (se, buffer, buffer_len);
2353 } /* for (sending_sockets) */
2354 } /* }}} void network_send_buffer */
2356 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
2357 value_list_t *vl_def,
2358 const data_set_t *ds, const value_list_t *vl)
2359 {
2360 char *buffer_orig = buffer;
2362 if (strcmp (vl_def->host, vl->host) != 0)
2363 {
2364 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2365 vl->host, strlen (vl->host)) != 0)
2366 return (-1);
2367 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2368 }
2370 if (vl_def->time != vl->time)
2371 {
2372 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
2373 (uint64_t) vl->time))
2374 return (-1);
2375 vl_def->time = vl->time;
2376 }
2378 if (vl_def->interval != vl->interval)
2379 {
2380 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
2381 (uint64_t) vl->interval))
2382 return (-1);
2383 vl_def->interval = vl->interval;
2384 }
2386 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2387 {
2388 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2389 vl->plugin, strlen (vl->plugin)) != 0)
2390 return (-1);
2391 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2392 }
2394 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2395 {
2396 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2397 vl->plugin_instance,
2398 strlen (vl->plugin_instance)) != 0)
2399 return (-1);
2400 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2401 }
2403 if (strcmp (vl_def->type, vl->type) != 0)
2404 {
2405 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2406 vl->type, strlen (vl->type)) != 0)
2407 return (-1);
2408 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2409 }
2411 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2412 {
2413 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2414 vl->type_instance,
2415 strlen (vl->type_instance)) != 0)
2416 return (-1);
2417 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2418 }
2420 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2421 return (-1);
2423 return (buffer - buffer_orig);
2424 } /* }}} int add_to_buffer */
2426 static void flush_buffer (void)
2427 {
2428 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2429 send_buffer_fill);
2431 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2432 network_init_buffer ();
2433 }
2435 static int network_write (const data_set_t *ds, const value_list_t *vl,
2436 user_data_t __attribute__((unused)) *user_data)
2437 {
2438 int status;
2440 if (!check_send_okay (vl))
2441 {
2442 #if COLLECT_DEBUG
2443 char name[6*DATA_MAX_NAME_LEN];
2444 FORMAT_VL (name, sizeof (name), vl);
2445 name[sizeof (name) - 1] = 0;
2446 DEBUG ("network plugin: network_write: "
2447 "NOT sending %s.", name);
2448 #endif
2449 return (0);
2450 }
2452 uc_meta_data_add_unsigned_int (vl,
2453 "network:time_sent", (uint64_t) vl->time);
2455 pthread_mutex_lock (&send_buffer_lock);
2457 status = add_to_buffer (send_buffer_ptr,
2458 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2459 &send_buffer_vl,
2460 ds, vl);
2461 if (status >= 0)
2462 {
2463 /* status == bytes added to the buffer */
2464 send_buffer_fill += status;
2465 send_buffer_ptr += status;
2466 }
2467 else
2468 {
2469 flush_buffer ();
2471 status = add_to_buffer (send_buffer_ptr,
2472 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2473 &send_buffer_vl,
2474 ds, vl);
2476 if (status >= 0)
2477 {
2478 send_buffer_fill += status;
2479 send_buffer_ptr += status;
2480 }
2481 }
2483 if (status < 0)
2484 {
2485 ERROR ("network plugin: Unable to append to the "
2486 "buffer for some weird reason");
2487 }
2488 else if ((network_config_packet_size - send_buffer_fill) < 15)
2489 {
2490 flush_buffer ();
2491 }
2493 pthread_mutex_unlock (&send_buffer_lock);
2495 return ((status < 0) ? -1 : 0);
2496 } /* int network_write */
2498 static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
2499 int *retval)
2500 {
2501 if ((ci->values_num != 1)
2502 || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
2503 && (ci->values[0].type != OCONFIG_TYPE_STRING)))
2504 {
2505 ERROR ("network plugin: The `%s' config option needs "
2506 "exactly one boolean argument.", ci->key);
2507 return (-1);
2508 }
2510 if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
2511 {
2512 if (ci->values[0].value.boolean)
2513 *retval = 1;
2514 else
2515 *retval = 0;
2516 }
2517 else
2518 {
2519 char *str = ci->values[0].value.string;
2521 if ((strcasecmp ("true", str) == 0)
2522 || (strcasecmp ("yes", str) == 0)
2523 || (strcasecmp ("on", str) == 0))
2524 *retval = 1;
2525 else if ((strcasecmp ("false", str) == 0)
2526 || (strcasecmp ("no", str) == 0)
2527 || (strcasecmp ("off", str) == 0))
2528 *retval = 0;
2529 else
2530 {
2531 ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
2532 "option as boolean value.",
2533 str, ci->key);
2534 return (-1);
2535 }
2536 }
2538 return (0);
2539 } /* }}} int network_config_set_boolean */
2541 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2542 {
2543 int tmp;
2544 if ((ci->values_num != 1)
2545 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2546 {
2547 WARNING ("network plugin: The `TimeToLive' config option needs exactly "
2548 "one numeric argument.");
2549 return (-1);
2550 }
2552 tmp = (int) ci->values[0].value.number;
2553 if ((tmp > 0) && (tmp <= 255))
2554 network_config_ttl = tmp;
2556 return (0);
2557 } /* }}} int network_config_set_ttl */
2559 static int network_config_set_buffer_size (const oconfig_item_t *ci) /* {{{ */
2560 {
2561 int tmp;
2562 if ((ci->values_num != 1)
2563 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2564 {
2565 WARNING ("network plugin: The `MaxPacketSize' config option needs exactly "
2566 "one numeric argument.");
2567 return (-1);
2568 }
2570 tmp = (int) ci->values[0].value.number;
2571 if ((tmp >= 1024) && (tmp <= 65535))
2572 network_config_packet_size = tmp;
2574 return (0);
2575 } /* }}} int network_config_set_buffer_size */
2577 #if HAVE_LIBGCRYPT
2578 static int network_config_set_string (const oconfig_item_t *ci, /* {{{ */
2579 char **ret_string)
2580 {
2581 char *tmp;
2582 if ((ci->values_num != 1)
2583 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2584 {
2585 WARNING ("network plugin: The `%s' config option needs exactly "
2586 "one string argument.", ci->key);
2587 return (-1);
2588 }
2590 tmp = strdup (ci->values[0].value.string);
2591 if (tmp == NULL)
2592 return (-1);
2594 sfree (*ret_string);
2595 *ret_string = tmp;
2597 return (0);
2598 } /* }}} int network_config_set_string */
2599 #endif /* HAVE_LIBGCRYPT */
2601 #if HAVE_LIBGCRYPT
2602 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
2603 int *retval)
2604 {
2605 char *str;
2606 if ((ci->values_num != 1)
2607 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2608 {
2609 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
2610 "one string argument.");
2611 return (-1);
2612 }
2614 str = ci->values[0].value.string;
2615 if (strcasecmp ("Encrypt", str) == 0)
2616 *retval = SECURITY_LEVEL_ENCRYPT;
2617 else if (strcasecmp ("Sign", str) == 0)
2618 *retval = SECURITY_LEVEL_SIGN;
2619 else if (strcasecmp ("None", str) == 0)
2620 *retval = SECURITY_LEVEL_NONE;
2621 else
2622 {
2623 WARNING ("network plugin: Unknown security level: %s.", str);
2624 return (-1);
2625 }
2627 return (0);
2628 } /* }}} int network_config_set_security_level */
2629 #endif /* HAVE_LIBGCRYPT */
2631 static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */
2632 {
2633 sockent_t *se;
2634 int status;
2635 int i;
2637 if ((ci->values_num < 1) || (ci->values_num > 2)
2638 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2639 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2640 {
2641 ERROR ("network plugin: The `%s' config option needs "
2642 "one or two string arguments.", ci->key);
2643 return (-1);
2644 }
2646 se = malloc (sizeof (*se));
2647 if (se == NULL)
2648 {
2649 ERROR ("network plugin: malloc failed.");
2650 return (-1);
2651 }
2652 sockent_init (se, SOCKENT_TYPE_SERVER);
2654 se->node = strdup (ci->values[0].value.string);
2655 if (ci->values_num >= 2)
2656 se->service = strdup (ci->values[1].value.string);
2658 for (i = 0; i < ci->children_num; i++)
2659 {
2660 oconfig_item_t *child = ci->children + i;
2662 #if HAVE_LIBGCRYPT
2663 if (strcasecmp ("AuthFile", child->key) == 0)
2664 network_config_set_string (child, &se->data.server.auth_file);
2665 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2666 network_config_set_security_level (child,
2667 &se->data.server.security_level);
2668 else
2669 #endif /* HAVE_LIBGCRYPT */
2670 {
2671 WARNING ("network plugin: Option `%s' is not allowed here.",
2672 child->key);
2673 }
2674 }
2676 #if HAVE_LIBGCRYPT
2677 if ((se->data.server.security_level > SECURITY_LEVEL_NONE)
2678 && (se->data.server.auth_file == NULL))
2679 {
2680 ERROR ("network plugin: A security level higher than `none' was "
2681 "requested, but no AuthFile option was given. Cowardly refusing to "
2682 "open this socket!");
2683 sockent_destroy (se);
2684 return (-1);
2685 }
2686 #endif /* HAVE_LIBGCRYPT */
2688 status = sockent_open (se);
2689 if (status != 0)
2690 {
2691 ERROR ("network plugin: network_config_add_listen: sockent_open failed.");
2692 sockent_destroy (se);
2693 return (-1);
2694 }
2696 status = sockent_add (se);
2697 if (status != 0)
2698 {
2699 ERROR ("network plugin: network_config_add_listen: sockent_add failed.");
2700 sockent_destroy (se);
2701 return (-1);
2702 }
2704 return (0);
2705 } /* }}} int network_config_add_listen */
2707 static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */
2708 {
2709 sockent_t *se;
2710 int status;
2711 int i;
2713 if ((ci->values_num < 1) || (ci->values_num > 2)
2714 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2715 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2716 {
2717 ERROR ("network plugin: The `%s' config option needs "
2718 "one or two string arguments.", ci->key);
2719 return (-1);
2720 }
2722 se = malloc (sizeof (*se));
2723 if (se == NULL)
2724 {
2725 ERROR ("network plugin: malloc failed.");
2726 return (-1);
2727 }
2728 sockent_init (se, SOCKENT_TYPE_CLIENT);
2730 se->node = strdup (ci->values[0].value.string);
2731 if (ci->values_num >= 2)
2732 se->service = strdup (ci->values[1].value.string);
2734 for (i = 0; i < ci->children_num; i++)
2735 {
2736 oconfig_item_t *child = ci->children + i;
2738 #if HAVE_LIBGCRYPT
2739 if (strcasecmp ("Username", child->key) == 0)
2740 network_config_set_string (child, &se->data.client.username);
2741 else if (strcasecmp ("Password", child->key) == 0)
2742 network_config_set_string (child, &se->data.client.password);
2743 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2744 network_config_set_security_level (child,
2745 &se->data.client.security_level);
2746 else
2747 #endif /* HAVE_LIBGCRYPT */
2748 {
2749 WARNING ("network plugin: Option `%s' is not allowed here.",
2750 child->key);
2751 }
2752 }
2754 #if HAVE_LIBGCRYPT
2755 if ((se->data.client.security_level > SECURITY_LEVEL_NONE)
2756 && ((se->data.client.username == NULL)
2757 || (se->data.client.password == NULL)))
2758 {
2759 ERROR ("network plugin: A security level higher than `none' was "
2760 "requested, but no Username or Password option was given. "
2761 "Cowardly refusing to open this socket!");
2762 sockent_destroy (se);
2763 return (-1);
2764 }
2765 #endif /* HAVE_LIBGCRYPT */
2767 status = sockent_open (se);
2768 if (status != 0)
2769 {
2770 ERROR ("network plugin: network_config_add_server: sockent_open failed.");
2771 sockent_destroy (se);
2772 return (-1);
2773 }
2775 status = sockent_add (se);
2776 if (status != 0)
2777 {
2778 ERROR ("network plugin: network_config_add_server: sockent_add failed.");
2779 sockent_destroy (se);
2780 return (-1);
2781 }
2783 return (0);
2784 } /* }}} int network_config_add_server */
2786 static int network_config (oconfig_item_t *ci) /* {{{ */
2787 {
2788 int i;
2790 for (i = 0; i < ci->children_num; i++)
2791 {
2792 oconfig_item_t *child = ci->children + i;
2794 if (strcasecmp ("Listen", child->key) == 0)
2795 network_config_add_listen (child);
2796 else if (strcasecmp ("Server", child->key) == 0)
2797 network_config_add_server (child);
2798 else if (strcasecmp ("TimeToLive", child->key) == 0)
2799 network_config_set_ttl (child);
2800 else if (strcasecmp ("MaxPacketSize", child->key) == 0)
2801 network_config_set_buffer_size (child);
2802 else if (strcasecmp ("Forward", child->key) == 0)
2803 network_config_set_boolean (child, &network_config_forward);
2804 else if (strcasecmp ("CacheFlush", child->key) == 0)
2805 /* no op for backwards compatibility only */;
2806 else
2807 {
2808 WARNING ("network plugin: Option `%s' is not allowed here.",
2809 child->key);
2810 }
2811 }
2813 return (0);
2814 } /* }}} int network_config */
2816 static int network_notification (const notification_t *n,
2817 user_data_t __attribute__((unused)) *user_data)
2818 {
2819 char buffer[network_config_packet_size];
2820 char *buffer_ptr = buffer;
2821 int buffer_free = sizeof (buffer);
2822 int status;
2824 memset (buffer, '\0', sizeof (buffer));
2827 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
2828 (uint64_t) n->time);
2829 if (status != 0)
2830 return (-1);
2832 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
2833 (uint64_t) n->severity);
2834 if (status != 0)
2835 return (-1);
2837 if (strlen (n->host) > 0)
2838 {
2839 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
2840 n->host, strlen (n->host));
2841 if (status != 0)
2842 return (-1);
2843 }
2845 if (strlen (n->plugin) > 0)
2846 {
2847 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
2848 n->plugin, strlen (n->plugin));
2849 if (status != 0)
2850 return (-1);
2851 }
2853 if (strlen (n->plugin_instance) > 0)
2854 {
2855 status = write_part_string (&buffer_ptr, &buffer_free,
2856 TYPE_PLUGIN_INSTANCE,
2857 n->plugin_instance, strlen (n->plugin_instance));
2858 if (status != 0)
2859 return (-1);
2860 }
2862 if (strlen (n->type) > 0)
2863 {
2864 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
2865 n->type, strlen (n->type));
2866 if (status != 0)
2867 return (-1);
2868 }
2870 if (strlen (n->type_instance) > 0)
2871 {
2872 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
2873 n->type_instance, strlen (n->type_instance));
2874 if (status != 0)
2875 return (-1);
2876 }
2878 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
2879 n->message, strlen (n->message));
2880 if (status != 0)
2881 return (-1);
2883 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
2885 return (0);
2886 } /* int network_notification */
2888 static int network_shutdown (void)
2889 {
2890 listen_loop++;
2892 /* Kill the listening thread */
2893 if (receive_thread_running != 0)
2894 {
2895 INFO ("network plugin: Stopping receive thread.");
2896 pthread_kill (receive_thread_id, SIGTERM);
2897 pthread_join (receive_thread_id, NULL /* no return value */);
2898 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
2899 receive_thread_running = 0;
2900 }
2902 /* Shutdown the dispatching thread */
2903 if (dispatch_thread_running != 0)
2904 {
2905 INFO ("network plugin: Stopping dispatch thread.");
2906 pthread_mutex_lock (&receive_list_lock);
2907 pthread_cond_broadcast (&receive_list_cond);
2908 pthread_mutex_unlock (&receive_list_lock);
2909 pthread_join (dispatch_thread_id, /* ret = */ NULL);
2910 dispatch_thread_running = 0;
2911 }
2913 sockent_destroy (listen_sockets);
2915 if (send_buffer_fill > 0)
2916 flush_buffer ();
2918 sfree (send_buffer);
2920 /* TODO: Close `sending_sockets' */
2922 plugin_unregister_config ("network");
2923 plugin_unregister_init ("network");
2924 plugin_unregister_write ("network");
2925 plugin_unregister_shutdown ("network");
2927 return (0);
2928 } /* int network_shutdown */
2930 static int network_init (void)
2931 {
2932 static _Bool have_init = false;
2934 /* Check if we were already initialized. If so, just return - there's
2935 * nothing more to do (for now, that is). */
2936 if (have_init)
2937 return (0);
2938 have_init = true;
2940 #if HAVE_LIBGCRYPT
2941 gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
2942 gcry_control (GCRYCTL_INIT_SECMEM, 32768, 0);
2943 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
2944 #endif
2946 plugin_register_shutdown ("network", network_shutdown);
2948 send_buffer = malloc (network_config_packet_size);
2949 if (send_buffer == NULL)
2950 {
2951 ERROR ("network plugin: malloc failed.");
2952 return (-1);
2953 }
2954 network_init_buffer ();
2956 /* setup socket(s) and so on */
2957 if (sending_sockets != NULL)
2958 {
2959 plugin_register_write ("network", network_write,
2960 /* user_data = */ NULL);
2961 plugin_register_notification ("network", network_notification,
2962 /* user_data = */ NULL);
2963 }
2965 /* If no threads need to be started, return here. */
2966 if ((listen_sockets_num == 0)
2967 || ((dispatch_thread_running != 0)
2968 && (receive_thread_running != 0)))
2969 return (0);
2971 if (dispatch_thread_running == 0)
2972 {
2973 int status;
2974 status = pthread_create (&dispatch_thread_id,
2975 NULL /* no attributes */,
2976 dispatch_thread,
2977 NULL /* no argument */);
2978 if (status != 0)
2979 {
2980 char errbuf[1024];
2981 ERROR ("network: pthread_create failed: %s",
2982 sstrerror (errno, errbuf,
2983 sizeof (errbuf)));
2984 }
2985 else
2986 {
2987 dispatch_thread_running = 1;
2988 }
2989 }
2991 if (receive_thread_running == 0)
2992 {
2993 int status;
2994 status = pthread_create (&receive_thread_id,
2995 NULL /* no attributes */,
2996 receive_thread,
2997 NULL /* no argument */);
2998 if (status != 0)
2999 {
3000 char errbuf[1024];
3001 ERROR ("network: pthread_create failed: %s",
3002 sstrerror (errno, errbuf,
3003 sizeof (errbuf)));
3004 }
3005 else
3006 {
3007 receive_thread_running = 1;
3008 }
3009 }
3011 return (0);
3012 } /* int network_init */
3014 /*
3015 * The flush option of the network plugin cannot flush individual identifiers.
3016 * All the values are added to a buffer and sent when the buffer is full, the
3017 * requested value may or may not be in there, it's not worth finding out. We
3018 * just send the buffer if `flush' is called - if the requested value was in
3019 * there, good. If not, well, then there is nothing to flush.. -octo
3020 */
3021 static int network_flush (int timeout,
3022 const char __attribute__((unused)) *identifier,
3023 user_data_t __attribute__((unused)) *user_data)
3024 {
3025 pthread_mutex_lock (&send_buffer_lock);
3027 if (send_buffer_fill > 0)
3028 flush_buffer ();
3030 pthread_mutex_unlock (&send_buffer_lock);
3032 return (0);
3033 } /* int network_flush */
3035 void module_register (void)
3036 {
3037 plugin_register_complex_config ("network", network_config);
3038 plugin_register_init ("network", network_init);
3039 plugin_register_flush ("network", network_flush,
3040 /* user_data = */ NULL);
3041 } /* void module_register */
3043 /* vim: set fdm=marker : */