1b560c4721750a2be34a221a2d9fd374dfe2a896
1 /**
2 * collectd - src/network.c
3 * Copyright (C) 2005-2013 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 collectd.org>
22 * Aman Gupta <aman at tmm1.net>
23 **/
25 #define _DEFAULT_SOURCE
26 #define _BSD_SOURCE /* For struct ip_mreq */
28 #include "collectd.h"
30 #include "plugin.h"
31 #include "common.h"
32 #include "configfile.h"
33 #include "utils_fbhash.h"
34 #include "utils_cache.h"
35 #include "utils_complain.h"
37 #include "network.h"
39 #if HAVE_NETDB_H
40 # include <netdb.h>
41 #endif
42 #if HAVE_NETINET_IN_H
43 # include <netinet/in.h>
44 #endif
45 #if HAVE_ARPA_INET_H
46 # include <arpa/inet.h>
47 #endif
48 #if HAVE_POLL_H
49 # include <poll.h>
50 #endif
51 #if HAVE_NET_IF_H
52 # include <net/if.h>
53 #endif
55 #if HAVE_LIBGCRYPT
56 # if defined __APPLE__
57 /* default xcode compiler throws warnings even when deprecated functionality
58 * is not used. -Werror breaks the build because of erroneous warnings.
59 * http://stackoverflow.com/questions/10556299/compiler-warnings-with-libgcrypt-v1-5-0/12830209#12830209
60 */
61 # pragma GCC diagnostic ignored "-Wdeprecated-declarations"
62 # endif
63 /* FreeBSD's copy of libgcrypt extends the existing GCRYPT_NO_DEPRECATED
64 * to properly hide all deprecated functionality.
65 * http://svnweb.freebsd.org/ports/head/security/libgcrypt/files/patch-src__gcrypt.h.in
66 */
67 # define GCRYPT_NO_DEPRECATED
68 # include <gcrypt.h>
69 # if defined __APPLE__
70 /* Re enable deprecation warnings */
71 # pragma GCC diagnostic warning "-Wdeprecated-declarations"
72 # endif
73 # if GCRYPT_VERSION_NUMBER < 0x010600
74 GCRY_THREAD_OPTION_PTHREAD_IMPL;
75 # endif
76 #endif
78 #ifndef IPV6_ADD_MEMBERSHIP
79 # ifdef IPV6_JOIN_GROUP
80 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
81 # else
82 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
83 # endif
84 #endif /* !IP_ADD_MEMBERSHIP */
86 /*
87 * Maximum size required for encryption / signing:
88 *
89 * 42 bytes for the encryption header
90 * + 64 bytes for the username
91 * -----------
92 * = 106 bytes
93 */
94 #define BUFF_SIG_SIZE 106
96 /*
97 * Private data types
98 */
99 #define SECURITY_LEVEL_NONE 0
100 #if HAVE_LIBGCRYPT
101 # define SECURITY_LEVEL_SIGN 1
102 # define SECURITY_LEVEL_ENCRYPT 2
103 #endif
104 struct sockent_client
105 {
106 int fd;
107 struct sockaddr_storage *addr;
108 socklen_t addrlen;
109 #if HAVE_LIBGCRYPT
110 int security_level;
111 char *username;
112 char *password;
113 gcry_cipher_hd_t cypher;
114 unsigned char password_hash[32];
115 #endif
116 cdtime_t next_resolve_reconnect;
117 cdtime_t resolve_interval;
118 };
120 struct sockent_server
121 {
122 int *fd;
123 size_t fd_num;
124 #if HAVE_LIBGCRYPT
125 int security_level;
126 char *auth_file;
127 fbhash_t *userdb;
128 gcry_cipher_hd_t cypher;
129 #endif
130 };
132 typedef struct sockent
133 {
134 #define SOCKENT_TYPE_CLIENT 1
135 #define SOCKENT_TYPE_SERVER 2
136 int type;
138 char *node;
139 char *service;
140 int interface;
142 union
143 {
144 struct sockent_client client;
145 struct sockent_server server;
146 } data;
148 struct sockent *next;
149 } sockent_t;
151 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
152 * 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
153 * +-------+-----------------------+-------------------------------+
154 * ! Ver. ! ! Length !
155 * +-------+-----------------------+-------------------------------+
156 */
157 struct part_header_s
158 {
159 uint16_t type;
160 uint16_t length;
161 };
162 typedef struct part_header_s part_header_t;
164 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
165 * 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
166 * +-------------------------------+-------------------------------+
167 * ! Type ! Length !
168 * +-------------------------------+-------------------------------+
169 * : (Length - 4) Bytes :
170 * +---------------------------------------------------------------+
171 */
172 struct part_string_s
173 {
174 part_header_t *head;
175 char *value;
176 };
177 typedef struct part_string_s part_string_t;
179 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
180 * 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
181 * +-------------------------------+-------------------------------+
182 * ! Type ! Length !
183 * +-------------------------------+-------------------------------+
184 * : (Length - 4 == 2 || 4 || 8) Bytes :
185 * +---------------------------------------------------------------+
186 */
187 struct part_number_s
188 {
189 part_header_t *head;
190 uint64_t *value;
191 };
192 typedef struct part_number_s part_number_t;
194 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
195 * 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
196 * +-------------------------------+-------------------------------+
197 * ! Type ! Length !
198 * +-------------------------------+---------------+---------------+
199 * ! Num of values ! Type0 ! Type1 !
200 * +-------------------------------+---------------+---------------+
201 * ! Value0 !
202 * ! !
203 * +---------------------------------------------------------------+
204 * ! Value1 !
205 * ! !
206 * +---------------------------------------------------------------+
207 */
208 struct part_values_s
209 {
210 part_header_t *head;
211 uint16_t *num_values;
212 uint8_t *values_types;
213 value_t *values;
214 };
215 typedef struct part_values_s part_values_t;
217 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
218 * 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
219 * +-------------------------------+-------------------------------+
220 * ! Type ! Length !
221 * +-------------------------------+-------------------------------+
222 * ! Hash (Bits 0 - 31) !
223 * : : :
224 * ! Hash (Bits 224 - 255) !
225 * +---------------------------------------------------------------+
226 */
227 /* Minimum size */
228 #define PART_SIGNATURE_SHA256_SIZE 36
229 struct part_signature_sha256_s
230 {
231 part_header_t head;
232 unsigned char hash[32];
233 char *username;
234 };
235 typedef struct part_signature_sha256_s part_signature_sha256_t;
237 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
238 * 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
239 * +-------------------------------+-------------------------------+
240 * ! Type ! Length !
241 * +-------------------------------+-------------------------------+
242 * ! Original length ! Padding (0 - 15 bytes) !
243 * +-------------------------------+-------------------------------+
244 * ! Hash (Bits 0 - 31) !
245 * : : :
246 * ! Hash (Bits 128 - 159) !
247 * +---------------------------------------------------------------+
248 */
249 /* Minimum size */
250 #define PART_ENCRYPTION_AES256_SIZE 42
251 struct part_encryption_aes256_s
252 {
253 part_header_t head;
254 uint16_t username_length;
255 char *username;
256 unsigned char iv[16];
257 /* <encrypted> */
258 unsigned char hash[20];
259 /* <payload /> */
260 /* </encrypted> */
261 };
262 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
264 struct receive_list_entry_s
265 {
266 char *data;
267 int data_len;
268 int fd;
269 struct receive_list_entry_s *next;
270 };
271 typedef struct receive_list_entry_s receive_list_entry_t;
273 /*
274 * Private variables
275 */
276 static int network_config_ttl = 0;
277 /* Ethernet - (IPv6 + UDP) = 1500 - (40 + 8) = 1452 */
278 static size_t network_config_packet_size = 1452;
279 static _Bool network_config_forward = 0;
280 static _Bool network_config_stats = 0;
282 static sockent_t *sending_sockets = NULL;
284 static receive_list_entry_t *receive_list_head = NULL;
285 static receive_list_entry_t *receive_list_tail = NULL;
286 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
287 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
288 static uint64_t receive_list_length = 0;
290 static sockent_t *listen_sockets = NULL;
291 static struct pollfd *listen_sockets_pollfd = NULL;
292 static size_t listen_sockets_num = 0;
294 /* The receive and dispatch threads will run as long as `listen_loop' is set to
295 * zero. */
296 static int listen_loop = 0;
297 static int receive_thread_running = 0;
298 static pthread_t receive_thread_id;
299 static int dispatch_thread_running = 0;
300 static pthread_t dispatch_thread_id;
302 /* Buffer in which to-be-sent network packets are constructed. */
303 static char *send_buffer;
304 static char *send_buffer_ptr;
305 static int send_buffer_fill;
306 static cdtime_t send_buffer_last_update;
307 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
308 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
310 /* XXX: These counters are incremented from one place only. The spot in which
311 * the values are incremented is either only reachable by one thread (the
312 * dispatch thread, for example) or locked by some lock (send_buffer_lock for
313 * example). Only if neither is true, the stats_lock is acquired. The counters
314 * are always read without holding a lock in the hope that writing 8 bytes to
315 * memory is an atomic operation. */
316 static derive_t stats_octets_rx = 0;
317 static derive_t stats_octets_tx = 0;
318 static derive_t stats_packets_rx = 0;
319 static derive_t stats_packets_tx = 0;
320 static derive_t stats_values_dispatched = 0;
321 static derive_t stats_values_not_dispatched = 0;
322 static derive_t stats_values_sent = 0;
323 static derive_t stats_values_not_sent = 0;
324 static pthread_mutex_t stats_lock = PTHREAD_MUTEX_INITIALIZER;
326 /*
327 * Private functions
328 */
329 static _Bool check_receive_okay (const value_list_t *vl) /* {{{ */
330 {
331 uint64_t time_sent = 0;
332 int status;
334 status = uc_meta_data_get_unsigned_int (vl,
335 "network:time_sent", &time_sent);
337 /* This is a value we already sent. Don't allow it to be received again in
338 * order to avoid looping. */
339 if ((status == 0) && (time_sent >= ((uint64_t) vl->time)))
340 return (0);
342 return (1);
343 } /* }}} _Bool check_receive_okay */
345 static _Bool check_send_okay (const value_list_t *vl) /* {{{ */
346 {
347 _Bool received = 0;
348 int status;
350 if (network_config_forward)
351 return (1);
353 if (vl->meta == NULL)
354 return (1);
356 status = meta_data_get_boolean (vl->meta, "network:received", &received);
357 if (status == -ENOENT)
358 return (1);
359 else if (status != 0)
360 {
361 ERROR ("network plugin: check_send_okay: meta_data_get_boolean failed "
362 "with status %i.", status);
363 return (1);
364 }
366 /* By default, only *send* value lists that were not *received* by the
367 * network plugin. */
368 return (!received);
369 } /* }}} _Bool check_send_okay */
371 static _Bool check_notify_received (const notification_t *n) /* {{{ */
372 {
373 for (notification_meta_t *ptr = n->meta; ptr != NULL; ptr = ptr->next)
374 if ((strcmp ("network:received", ptr->name) == 0)
375 && (ptr->type == NM_TYPE_BOOLEAN))
376 return ((_Bool) ptr->nm_value.nm_boolean);
378 return (0);
379 } /* }}} _Bool check_notify_received */
381 static _Bool check_send_notify_okay (const notification_t *n) /* {{{ */
382 {
383 static c_complain_t complain_forwarding = C_COMPLAIN_INIT_STATIC;
384 _Bool received = 0;
386 if (n->meta == NULL)
387 return (1);
389 received = check_notify_received (n);
391 if (network_config_forward && received)
392 {
393 c_complain_once (LOG_ERR, &complain_forwarding,
394 "network plugin: A notification has been received via the network "
395 "and forwarding is enabled. Forwarding of notifications is currently "
396 "not supported, because there is not loop-deteciton available. "
397 "Please contact the collectd mailing list if you need this "
398 "feature.");
399 }
401 /* By default, only *send* value lists that were not *received* by the
402 * network plugin. */
403 return (!received);
404 } /* }}} _Bool check_send_notify_okay */
406 static int network_dispatch_values (value_list_t *vl, /* {{{ */
407 const char *username)
408 {
409 int status;
411 if ((vl->time == 0)
412 || (strlen (vl->host) == 0)
413 || (strlen (vl->plugin) == 0)
414 || (strlen (vl->type) == 0))
415 return (-EINVAL);
417 if (!check_receive_okay (vl))
418 {
419 #if COLLECT_DEBUG
420 char name[6*DATA_MAX_NAME_LEN];
421 FORMAT_VL (name, sizeof (name), vl);
422 name[sizeof (name) - 1] = 0;
423 DEBUG ("network plugin: network_dispatch_values: "
424 "NOT dispatching %s.", name);
425 #endif
426 stats_values_not_dispatched++;
427 return (0);
428 }
430 assert (vl->meta == NULL);
432 vl->meta = meta_data_create ();
433 if (vl->meta == NULL)
434 {
435 ERROR ("network plugin: meta_data_create failed.");
436 return (-ENOMEM);
437 }
439 status = meta_data_add_boolean (vl->meta, "network:received", 1);
440 if (status != 0)
441 {
442 ERROR ("network plugin: meta_data_add_boolean failed.");
443 meta_data_destroy (vl->meta);
444 vl->meta = NULL;
445 return (status);
446 }
448 if (username != NULL)
449 {
450 status = meta_data_add_string (vl->meta, "network:username", username);
451 if (status != 0)
452 {
453 ERROR ("network plugin: meta_data_add_string failed.");
454 meta_data_destroy (vl->meta);
455 vl->meta = NULL;
456 return (status);
457 }
458 }
460 plugin_dispatch_values (vl);
461 stats_values_dispatched++;
463 meta_data_destroy (vl->meta);
464 vl->meta = NULL;
466 return (0);
467 } /* }}} int network_dispatch_values */
469 static int network_dispatch_notification (notification_t *n) /* {{{ */
470 {
471 int status;
473 assert (n->meta == NULL);
475 status = plugin_notification_meta_add_boolean (n, "network:received", 1);
476 if (status != 0)
477 {
478 ERROR ("network plugin: plugin_notification_meta_add_boolean failed.");
479 plugin_notification_meta_free (n->meta);
480 n->meta = NULL;
481 return (status);
482 }
484 status = plugin_dispatch_notification (n);
486 plugin_notification_meta_free (n->meta);
487 n->meta = NULL;
489 return (status);
490 } /* }}} int network_dispatch_notification */
492 #if HAVE_LIBGCRYPT
493 static void network_init_gcrypt (void) /* {{{ */
494 {
495 gcry_error_t err;
497 /* http://lists.gnupg.org/pipermail/gcrypt-devel/2003-August/000458.html
498 * Because you can't know in a library whether another library has
499 * already initialized the library */
500 if (gcry_control (GCRYCTL_ANY_INITIALIZATION_P))
501 return;
503 /* http://www.gnupg.org/documentation/manuals/gcrypt/Multi_002dThreading.html
504 * To ensure thread-safety, it's important to set GCRYCTL_SET_THREAD_CBS
505 * *before* initalizing Libgcrypt with gcry_check_version(), which itself must
506 * be called before any other gcry_* function. GCRYCTL_ANY_INITIALIZATION_P
507 * above doesn't count, as it doesn't implicitly initalize Libgcrypt.
508 *
509 * tl;dr: keep all these gry_* statements in this exact order please. */
510 # if GCRYPT_VERSION_NUMBER < 0x010600
511 err = gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
512 if (err)
513 {
514 ERROR ("network plugin: gcry_control (GCRYCTL_SET_THREAD_CBS) failed: %s", gcry_strerror (err));
515 abort ();
516 }
517 # endif
519 gcry_check_version (NULL);
521 err = gcry_control (GCRYCTL_INIT_SECMEM, 32768);
522 if (err)
523 {
524 ERROR ("network plugin: gcry_control (GCRYCTL_INIT_SECMEM) failed: %s", gcry_strerror (err));
525 abort ();
526 }
528 gcry_control (GCRYCTL_INITIALIZATION_FINISHED);
529 } /* }}} void network_init_gcrypt */
531 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
532 const void *iv, size_t iv_size, const char *username)
533 {
534 gcry_error_t err;
535 gcry_cipher_hd_t *cyper_ptr;
536 unsigned char password_hash[32];
538 if (se->type == SOCKENT_TYPE_CLIENT)
539 {
540 cyper_ptr = &se->data.client.cypher;
541 memcpy (password_hash, se->data.client.password_hash,
542 sizeof (password_hash));
543 }
544 else
545 {
546 char *secret;
548 cyper_ptr = &se->data.server.cypher;
550 if (username == NULL)
551 return (NULL);
553 secret = fbh_get (se->data.server.userdb, username);
554 if (secret == NULL)
555 return (NULL);
557 gcry_md_hash_buffer (GCRY_MD_SHA256,
558 password_hash,
559 secret, strlen (secret));
561 sfree (secret);
562 }
564 if (*cyper_ptr == NULL)
565 {
566 err = gcry_cipher_open (cyper_ptr,
567 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0);
568 if (err != 0)
569 {
570 ERROR ("network plugin: gcry_cipher_open returned: %s",
571 gcry_strerror (err));
572 *cyper_ptr = NULL;
573 return (NULL);
574 }
575 }
576 else
577 {
578 gcry_cipher_reset (*cyper_ptr);
579 }
580 assert (*cyper_ptr != NULL);
582 err = gcry_cipher_setkey (*cyper_ptr,
583 password_hash, sizeof (password_hash));
584 if (err != 0)
585 {
586 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
587 gcry_strerror (err));
588 gcry_cipher_close (*cyper_ptr);
589 *cyper_ptr = NULL;
590 return (NULL);
591 }
593 err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size);
594 if (err != 0)
595 {
596 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
597 gcry_strerror (err));
598 gcry_cipher_close (*cyper_ptr);
599 *cyper_ptr = NULL;
600 return (NULL);
601 }
603 return (*cyper_ptr);
604 } /* }}} int network_get_aes256_cypher */
605 #endif /* HAVE_LIBGCRYPT */
607 static int write_part_values (char **ret_buffer, size_t *ret_buffer_len,
608 const data_set_t *ds, const value_list_t *vl)
609 {
610 char *packet_ptr;
611 size_t packet_len;
612 int num_values;
614 part_header_t pkg_ph;
615 uint16_t pkg_num_values;
616 uint8_t *pkg_values_types;
617 value_t *pkg_values;
619 size_t offset;
621 num_values = vl->values_len;
622 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
623 + (num_values * sizeof (uint8_t))
624 + (num_values * sizeof (value_t));
626 if (*ret_buffer_len < packet_len)
627 return (-1);
629 pkg_values_types = malloc (num_values * sizeof (*pkg_values_types));
630 if (pkg_values_types == NULL)
631 {
632 ERROR ("network plugin: write_part_values: malloc failed.");
633 return (-1);
634 }
636 pkg_values = malloc (num_values * sizeof (*pkg_values));
637 if (pkg_values == NULL)
638 {
639 free (pkg_values_types);
640 ERROR ("network plugin: write_part_values: malloc failed.");
641 return (-1);
642 }
644 pkg_ph.type = htons (TYPE_VALUES);
645 pkg_ph.length = htons (packet_len);
647 pkg_num_values = htons ((uint16_t) vl->values_len);
649 for (int i = 0; i < num_values; i++)
650 {
651 pkg_values_types[i] = (uint8_t) ds->ds[i].type;
652 switch (ds->ds[i].type)
653 {
654 case DS_TYPE_COUNTER:
655 pkg_values[i].counter = htonll (vl->values[i].counter);
656 break;
658 case DS_TYPE_GAUGE:
659 pkg_values[i].gauge = htond (vl->values[i].gauge);
660 break;
662 case DS_TYPE_DERIVE:
663 pkg_values[i].derive = htonll (vl->values[i].derive);
664 break;
666 case DS_TYPE_ABSOLUTE:
667 pkg_values[i].absolute = htonll (vl->values[i].absolute);
668 break;
670 default:
671 free (pkg_values_types);
672 free (pkg_values);
673 ERROR ("network plugin: write_part_values: "
674 "Unknown data source type: %i",
675 ds->ds[i].type);
676 return (-1);
677 } /* switch (ds->ds[i].type) */
678 } /* for (num_values) */
680 /*
681 * Use `memcpy' to write everything to the buffer, because the pointer
682 * may be unaligned and some architectures, such as SPARC, can't handle
683 * that.
684 */
685 packet_ptr = *ret_buffer;
686 offset = 0;
687 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
688 offset += sizeof (pkg_ph);
689 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
690 offset += sizeof (pkg_num_values);
691 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
692 offset += num_values * sizeof (uint8_t);
693 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
694 offset += num_values * sizeof (value_t);
696 assert (offset == packet_len);
698 *ret_buffer = packet_ptr + packet_len;
699 *ret_buffer_len -= packet_len;
701 free (pkg_values_types);
702 free (pkg_values);
704 return (0);
705 } /* int write_part_values */
707 static int write_part_number (char **ret_buffer, size_t *ret_buffer_len,
708 int type, uint64_t value)
709 {
710 char *packet_ptr;
711 size_t packet_len;
713 part_header_t pkg_head;
714 uint64_t pkg_value;
716 size_t offset;
718 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
720 if (*ret_buffer_len < packet_len)
721 return (-1);
723 pkg_head.type = htons (type);
724 pkg_head.length = htons (packet_len);
725 pkg_value = htonll (value);
727 packet_ptr = *ret_buffer;
728 offset = 0;
729 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
730 offset += sizeof (pkg_head);
731 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
732 offset += sizeof (pkg_value);
734 assert (offset == packet_len);
736 *ret_buffer = packet_ptr + packet_len;
737 *ret_buffer_len -= packet_len;
739 return (0);
740 } /* int write_part_number */
742 static int write_part_string (char **ret_buffer, size_t *ret_buffer_len,
743 int type, const char *str, size_t str_len)
744 {
745 char *buffer;
746 size_t buffer_len;
748 uint16_t pkg_type;
749 uint16_t pkg_length;
751 size_t offset;
753 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
754 if (*ret_buffer_len < buffer_len)
755 return (-1);
757 pkg_type = htons (type);
758 pkg_length = htons (buffer_len);
760 buffer = *ret_buffer;
761 offset = 0;
762 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
763 offset += sizeof (pkg_type);
764 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
765 offset += sizeof (pkg_length);
766 memcpy (buffer + offset, str, str_len);
767 offset += str_len;
768 memset (buffer + offset, '\0', 1);
769 offset += 1;
771 assert (offset == buffer_len);
773 *ret_buffer = buffer + buffer_len;
774 *ret_buffer_len -= buffer_len;
776 return (0);
777 } /* int write_part_string */
779 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
780 value_t **ret_values, size_t *ret_num_values)
781 {
782 char *buffer = *ret_buffer;
783 size_t buffer_len = *ret_buffer_len;
785 uint16_t tmp16;
786 size_t exp_size;
788 uint16_t pkg_length;
789 uint16_t pkg_type;
790 size_t pkg_numval;
792 uint8_t *pkg_types;
793 value_t *pkg_values;
795 if (buffer_len < 15)
796 {
797 NOTICE ("network plugin: packet is too short: "
798 "buffer_len = %zu", buffer_len);
799 return (-1);
800 }
802 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
803 buffer += sizeof (tmp16);
804 pkg_type = ntohs (tmp16);
806 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
807 buffer += sizeof (tmp16);
808 pkg_length = ntohs (tmp16);
810 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
811 buffer += sizeof (tmp16);
812 pkg_numval = (size_t) ntohs (tmp16);
814 assert (pkg_type == TYPE_VALUES);
816 exp_size = 3 * sizeof (uint16_t)
817 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
818 if (buffer_len < exp_size)
819 {
820 WARNING ("network plugin: parse_part_values: "
821 "Packet too short: "
822 "Chunk of size %zu expected, "
823 "but buffer has only %zu bytes left.",
824 exp_size, buffer_len);
825 return (-1);
826 }
827 assert (pkg_numval <= ((buffer_len - 6) / 9));
829 if (pkg_length != exp_size)
830 {
831 WARNING ("network plugin: parse_part_values: "
832 "Length and number of values "
833 "in the packet don't match.");
834 return (-1);
835 }
837 pkg_types = calloc (pkg_numval, sizeof (*pkg_types));
838 pkg_values = calloc (pkg_numval, sizeof (*pkg_values));
839 if ((pkg_types == NULL) || (pkg_values == NULL))
840 {
841 sfree (pkg_types);
842 sfree (pkg_values);
843 ERROR ("network plugin: parse_part_values: calloc failed.");
844 return (-1);
845 }
847 memcpy (pkg_types, buffer, pkg_numval * sizeof (*pkg_types));
848 buffer += pkg_numval * sizeof (*pkg_types);
849 memcpy (pkg_values, buffer, pkg_numval * sizeof (*pkg_values));
850 buffer += pkg_numval * sizeof (*pkg_values);
852 for (size_t i = 0; i < pkg_numval; i++)
853 {
854 switch (pkg_types[i])
855 {
856 case DS_TYPE_COUNTER:
857 pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter);
858 break;
860 case DS_TYPE_GAUGE:
861 pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge);
862 break;
864 case DS_TYPE_DERIVE:
865 pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive);
866 break;
868 case DS_TYPE_ABSOLUTE:
869 pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute);
870 break;
872 default:
873 NOTICE ("network plugin: parse_part_values: "
874 "Don't know how to handle data source type %"PRIu8,
875 pkg_types[i]);
876 sfree (pkg_types);
877 sfree (pkg_values);
878 return (-1);
879 } /* switch (pkg_types[i]) */
880 }
882 *ret_buffer = buffer;
883 *ret_buffer_len = buffer_len - pkg_length;
884 *ret_num_values = pkg_numval;
885 *ret_values = pkg_values;
887 sfree (pkg_types);
889 return (0);
890 } /* int parse_part_values */
892 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
893 uint64_t *value)
894 {
895 char *buffer = *ret_buffer;
896 size_t buffer_len = *ret_buffer_len;
898 uint16_t tmp16;
899 uint64_t tmp64;
900 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
902 uint16_t pkg_length;
904 if (buffer_len < exp_size)
905 {
906 WARNING ("network plugin: parse_part_number: "
907 "Packet too short: "
908 "Chunk of size %zu expected, "
909 "but buffer has only %zu bytes left.",
910 exp_size, buffer_len);
911 return (-1);
912 }
914 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
915 buffer += sizeof (tmp16);
916 /* pkg_type = ntohs (tmp16); */
918 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
919 buffer += sizeof (tmp16);
920 pkg_length = ntohs (tmp16);
922 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
923 buffer += sizeof (tmp64);
924 *value = ntohll (tmp64);
926 *ret_buffer = buffer;
927 *ret_buffer_len = buffer_len - pkg_length;
929 return (0);
930 } /* int parse_part_number */
932 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
933 char *output, size_t const output_len)
934 {
935 char *buffer = *ret_buffer;
936 size_t buffer_len = *ret_buffer_len;
938 uint16_t tmp16;
939 size_t const header_size = 2 * sizeof (uint16_t);
941 uint16_t pkg_length;
942 size_t payload_size;
944 if (output_len == 0)
945 return (EINVAL);
947 if (buffer_len < header_size)
948 {
949 WARNING ("network plugin: parse_part_string: "
950 "Packet too short: "
951 "Chunk of at least size %zu expected, "
952 "but buffer has only %zu bytes left.",
953 header_size, buffer_len);
954 return (-1);
955 }
957 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
958 buffer += sizeof (tmp16);
959 /* pkg_type = ntohs (tmp16); */
961 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
962 buffer += sizeof (tmp16);
963 pkg_length = ntohs (tmp16);
964 payload_size = ((size_t) pkg_length) - header_size;
966 /* Check that packet fits in the input buffer */
967 if (pkg_length > buffer_len)
968 {
969 WARNING ("network plugin: parse_part_string: "
970 "Packet too big: "
971 "Chunk of size %"PRIu16" received, "
972 "but buffer has only %zu bytes left.",
973 pkg_length, buffer_len);
974 return (-1);
975 }
977 /* Check that pkg_length is in the valid range */
978 if (pkg_length <= header_size)
979 {
980 WARNING ("network plugin: parse_part_string: "
981 "Packet too short: "
982 "Header claims this packet is only %hu "
983 "bytes long.", pkg_length);
984 return (-1);
985 }
987 /* Check that the package data fits into the output buffer.
988 * The previous if-statement ensures that:
989 * `pkg_length > header_size' */
990 if (output_len < payload_size)
991 {
992 WARNING ("network plugin: parse_part_string: "
993 "Buffer too small: "
994 "Output buffer holds %zu bytes, "
995 "which is too small to hold the received "
996 "%zu byte string.",
997 output_len, payload_size);
998 return (-1);
999 }
1001 /* All sanity checks successfull, let's copy the data over */
1002 memcpy ((void *) output, (void *) buffer, payload_size);
1003 buffer += payload_size;
1005 /* For some very weird reason '\0' doesn't do the trick on SPARC in
1006 * this statement. */
1007 if (output[payload_size - 1] != 0)
1008 {
1009 WARNING ("network plugin: parse_part_string: "
1010 "Received string does not end "
1011 "with a NULL-byte.");
1012 return (-1);
1013 }
1015 *ret_buffer = buffer;
1016 *ret_buffer_len = buffer_len - pkg_length;
1018 return (0);
1019 } /* int parse_part_string */
1021 /* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call
1022 * parse_packet and vice versa. */
1023 #define PP_SIGNED 0x01
1024 #define PP_ENCRYPTED 0x02
1025 static int parse_packet (sockent_t *se,
1026 void *buffer, size_t buffer_size, int flags,
1027 const char *username);
1029 #define BUFFER_READ(p,s) do { \
1030 memcpy ((p), buffer + buffer_offset, (s)); \
1031 buffer_offset += (s); \
1032 } while (0)
1034 #if HAVE_LIBGCRYPT
1035 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1036 void **ret_buffer, size_t *ret_buffer_len, int flags)
1037 {
1038 static c_complain_t complain_no_users = C_COMPLAIN_INIT_STATIC;
1040 char *buffer;
1041 size_t buffer_len;
1042 size_t buffer_offset;
1044 size_t username_len;
1045 char *secret;
1047 part_signature_sha256_t pss;
1048 uint16_t pss_head_length;
1049 char hash[sizeof (pss.hash)];
1051 gcry_md_hd_t hd;
1052 gcry_error_t err;
1053 unsigned char *hash_ptr;
1055 buffer = *ret_buffer;
1056 buffer_len = *ret_buffer_len;
1057 buffer_offset = 0;
1059 if (se->data.server.userdb == NULL)
1060 {
1061 c_complain (LOG_NOTICE, &complain_no_users,
1062 "network plugin: Received signed network packet but can't verify it "
1063 "because no user DB has been configured. Will accept it.");
1064 return (0);
1065 }
1067 /* Check if the buffer has enough data for this structure. */
1068 if (buffer_len <= PART_SIGNATURE_SHA256_SIZE)
1069 return (-ENOMEM);
1071 /* Read type and length header */
1072 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1073 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1074 pss_head_length = ntohs (pss.head.length);
1076 /* Check if the `pss_head_length' is within bounds. */
1077 if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE)
1078 || (pss_head_length > buffer_len))
1079 {
1080 ERROR ("network plugin: HMAC-SHA-256 with invalid length received.");
1081 return (-1);
1082 }
1084 /* Copy the hash. */
1085 BUFFER_READ (pss.hash, sizeof (pss.hash));
1087 /* Calculate username length (without null byte) and allocate memory */
1088 username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE;
1089 pss.username = malloc (username_len + 1);
1090 if (pss.username == NULL)
1091 return (-ENOMEM);
1093 /* Read the username */
1094 BUFFER_READ (pss.username, username_len);
1095 pss.username[username_len] = 0;
1097 assert (buffer_offset == pss_head_length);
1099 /* Query the password */
1100 secret = fbh_get (se->data.server.userdb, pss.username);
1101 if (secret == NULL)
1102 {
1103 ERROR ("network plugin: Unknown user: %s", pss.username);
1104 sfree (pss.username);
1105 return (-ENOENT);
1106 }
1108 /* Create a hash device and check the HMAC */
1109 hd = NULL;
1110 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
1111 if (err != 0)
1112 {
1113 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
1114 gcry_strerror (err));
1115 sfree (secret);
1116 sfree (pss.username);
1117 return (-1);
1118 }
1120 err = gcry_md_setkey (hd, secret, strlen (secret));
1121 if (err != 0)
1122 {
1123 ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err));
1124 gcry_md_close (hd);
1125 sfree (secret);
1126 sfree (pss.username);
1127 return (-1);
1128 }
1130 gcry_md_write (hd,
1131 buffer + PART_SIGNATURE_SHA256_SIZE,
1132 buffer_len - PART_SIGNATURE_SHA256_SIZE);
1133 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
1134 if (hash_ptr == NULL)
1135 {
1136 ERROR ("network plugin: gcry_md_read failed.");
1137 gcry_md_close (hd);
1138 sfree (secret);
1139 sfree (pss.username);
1140 return (-1);
1141 }
1142 memcpy (hash, hash_ptr, sizeof (hash));
1144 /* Clean up */
1145 gcry_md_close (hd);
1146 hd = NULL;
1148 if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0)
1149 {
1150 WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: "
1151 "Hash mismatch.");
1152 }
1153 else
1154 {
1155 parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset,
1156 flags | PP_SIGNED, pss.username);
1157 }
1159 sfree (secret);
1160 sfree (pss.username);
1162 *ret_buffer = buffer + buffer_len;
1163 *ret_buffer_len = 0;
1165 return (0);
1166 } /* }}} int parse_part_sign_sha256 */
1167 /* #endif HAVE_LIBGCRYPT */
1169 #else /* if !HAVE_LIBGCRYPT */
1170 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1171 void **ret_buffer, size_t *ret_buffer_size, int flags)
1172 {
1173 static int warning_has_been_printed = 0;
1175 char *buffer;
1176 size_t buffer_size;
1177 size_t buffer_offset;
1178 uint16_t part_len;
1180 part_signature_sha256_t pss;
1182 buffer = *ret_buffer;
1183 buffer_size = *ret_buffer_size;
1184 buffer_offset = 0;
1186 if (buffer_size <= PART_SIGNATURE_SHA256_SIZE)
1187 return (-ENOMEM);
1189 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1190 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1191 part_len = ntohs (pss.head.length);
1193 if ((part_len <= PART_SIGNATURE_SHA256_SIZE)
1194 || (part_len > buffer_size))
1195 return (-EINVAL);
1197 if (warning_has_been_printed == 0)
1198 {
1199 WARNING ("network plugin: Received signed packet, but the network "
1200 "plugin was not linked with libgcrypt, so I cannot "
1201 "verify the signature. The packet will be accepted.");
1202 warning_has_been_printed = 1;
1203 }
1205 parse_packet (se, buffer + part_len, buffer_size - part_len, flags,
1206 /* username = */ NULL);
1208 *ret_buffer = buffer + buffer_size;
1209 *ret_buffer_size = 0;
1211 return (0);
1212 } /* }}} int parse_part_sign_sha256 */
1213 #endif /* !HAVE_LIBGCRYPT */
1215 #if HAVE_LIBGCRYPT
1216 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1217 void **ret_buffer, size_t *ret_buffer_len,
1218 int flags)
1219 {
1220 char *buffer = *ret_buffer;
1221 size_t buffer_len = *ret_buffer_len;
1222 size_t payload_len;
1223 size_t part_size;
1224 size_t buffer_offset;
1225 uint16_t username_len;
1226 part_encryption_aes256_t pea;
1227 unsigned char hash[sizeof (pea.hash)] = { 0 };
1229 gcry_cipher_hd_t cypher;
1230 gcry_error_t err;
1232 /* Make sure at least the header if available. */
1233 if (buffer_len <= PART_ENCRYPTION_AES256_SIZE)
1234 {
1235 NOTICE ("network plugin: parse_part_encr_aes256: "
1236 "Discarding short packet.");
1237 return (-1);
1238 }
1240 buffer_offset = 0;
1242 /* Copy the unencrypted information into `pea'. */
1243 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
1244 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
1246 /* Check the `part size'. */
1247 part_size = ntohs (pea.head.length);
1248 if ((part_size <= PART_ENCRYPTION_AES256_SIZE)
1249 || (part_size > buffer_len))
1250 {
1251 NOTICE ("network plugin: parse_part_encr_aes256: "
1252 "Discarding part with invalid size.");
1253 return (-1);
1254 }
1256 /* Read the username */
1257 BUFFER_READ (&username_len, sizeof (username_len));
1258 username_len = ntohs (username_len);
1260 if ((username_len == 0)
1261 || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1))))
1262 {
1263 NOTICE ("network plugin: parse_part_encr_aes256: "
1264 "Discarding part with invalid username length.");
1265 return (-1);
1266 }
1268 assert (username_len > 0);
1269 pea.username = malloc (username_len + 1);
1270 if (pea.username == NULL)
1271 return (-ENOMEM);
1272 BUFFER_READ (pea.username, username_len);
1273 pea.username[username_len] = 0;
1275 /* Last but not least, the initialization vector */
1276 BUFFER_READ (pea.iv, sizeof (pea.iv));
1278 /* Make sure we are at the right position */
1279 assert (buffer_offset == (username_len +
1280 PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash)));
1282 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
1283 pea.username);
1284 if (cypher == NULL)
1285 {
1286 sfree (pea.username);
1287 return (-1);
1288 }
1290 payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len);
1291 assert (payload_len > 0);
1293 /* Decrypt the packet in-place */
1294 err = gcry_cipher_decrypt (cypher,
1295 buffer + buffer_offset,
1296 part_size - buffer_offset,
1297 /* in = */ NULL, /* in len = */ 0);
1298 if (err != 0)
1299 {
1300 sfree (pea.username);
1301 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
1302 gcry_strerror (err));
1303 return (-1);
1304 }
1306 /* Read the hash */
1307 BUFFER_READ (pea.hash, sizeof (pea.hash));
1309 /* Make sure we're at the right position - again */
1310 assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE));
1311 assert (buffer_offset == (part_size - payload_len));
1313 /* Check hash sum */
1314 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
1315 buffer + buffer_offset, payload_len);
1316 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
1317 {
1318 sfree (pea.username);
1319 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
1320 return (-1);
1321 }
1323 parse_packet (se, buffer + buffer_offset, payload_len,
1324 flags | PP_ENCRYPTED, pea.username);
1326 /* XXX: Free pea.username?!? */
1328 /* Update return values */
1329 *ret_buffer = buffer + part_size;
1330 *ret_buffer_len = buffer_len - part_size;
1332 sfree (pea.username);
1334 return (0);
1335 } /* }}} int parse_part_encr_aes256 */
1336 /* #endif HAVE_LIBGCRYPT */
1338 #else /* if !HAVE_LIBGCRYPT */
1339 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1340 void **ret_buffer, size_t *ret_buffer_size, int flags)
1341 {
1342 static int warning_has_been_printed = 0;
1344 char *buffer;
1345 size_t buffer_size;
1346 size_t buffer_offset;
1348 part_header_t ph;
1349 size_t ph_length;
1351 buffer = *ret_buffer;
1352 buffer_size = *ret_buffer_size;
1353 buffer_offset = 0;
1355 /* parse_packet assures this minimum size. */
1356 assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length)));
1358 BUFFER_READ (&ph.type, sizeof (ph.type));
1359 BUFFER_READ (&ph.length, sizeof (ph.length));
1360 ph_length = ntohs (ph.length);
1362 if ((ph_length <= PART_ENCRYPTION_AES256_SIZE)
1363 || (ph_length > buffer_size))
1364 {
1365 ERROR ("network plugin: AES-256 encrypted part "
1366 "with invalid length received.");
1367 return (-1);
1368 }
1370 if (warning_has_been_printed == 0)
1371 {
1372 WARNING ("network plugin: Received encrypted packet, but the network "
1373 "plugin was not linked with libgcrypt, so I cannot "
1374 "decrypt it. The part will be discarded.");
1375 warning_has_been_printed = 1;
1376 }
1378 *ret_buffer = (void *) (((char *) *ret_buffer) + ph_length);
1379 *ret_buffer_size -= ph_length;
1381 return (0);
1382 } /* }}} int parse_part_encr_aes256 */
1383 #endif /* !HAVE_LIBGCRYPT */
1385 #undef BUFFER_READ
1387 static int parse_packet (sockent_t *se, /* {{{ */
1388 void *buffer, size_t buffer_size, int flags,
1389 const char *username)
1390 {
1391 int status;
1393 value_list_t vl = VALUE_LIST_INIT;
1394 notification_t n = { 0 };
1396 #if HAVE_LIBGCRYPT
1397 int packet_was_signed = (flags & PP_SIGNED);
1398 int packet_was_encrypted = (flags & PP_ENCRYPTED);
1399 int printed_ignore_warning = 0;
1400 #endif /* HAVE_LIBGCRYPT */
1403 memset (&vl, '\0', sizeof (vl));
1404 status = 0;
1406 while ((status == 0) && (0 < buffer_size)
1407 && ((unsigned int) buffer_size > sizeof (part_header_t)))
1408 {
1409 uint16_t pkg_length;
1410 uint16_t pkg_type;
1412 memcpy ((void *) &pkg_type,
1413 (void *) buffer,
1414 sizeof (pkg_type));
1415 memcpy ((void *) &pkg_length,
1416 (void *) (((char *) buffer) + sizeof (pkg_type)),
1417 sizeof (pkg_length));
1419 pkg_length = ntohs (pkg_length);
1420 pkg_type = ntohs (pkg_type);
1422 if (pkg_length > buffer_size)
1423 break;
1424 /* Ensure that this loop terminates eventually */
1425 if (pkg_length < (2 * sizeof (uint16_t)))
1426 break;
1428 if (pkg_type == TYPE_ENCR_AES256)
1429 {
1430 status = parse_part_encr_aes256 (se,
1431 &buffer, &buffer_size, flags);
1432 if (status != 0)
1433 {
1434 ERROR ("network plugin: Decrypting AES256 "
1435 "part failed "
1436 "with status %i.", status);
1437 break;
1438 }
1439 }
1440 #if HAVE_LIBGCRYPT
1441 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
1442 && (packet_was_encrypted == 0))
1443 {
1444 if (printed_ignore_warning == 0)
1445 {
1446 INFO ("network plugin: Unencrypted packet or "
1447 "part has been ignored.");
1448 printed_ignore_warning = 1;
1449 }
1450 buffer = ((char *) buffer) + pkg_length;
1451 buffer_size -= (size_t) pkg_length;
1452 continue;
1453 }
1454 #endif /* HAVE_LIBGCRYPT */
1455 else if (pkg_type == TYPE_SIGN_SHA256)
1456 {
1457 status = parse_part_sign_sha256 (se,
1458 &buffer, &buffer_size, flags);
1459 if (status != 0)
1460 {
1461 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1462 "signature failed "
1463 "with status %i.", status);
1464 break;
1465 }
1466 }
1467 #if HAVE_LIBGCRYPT
1468 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
1469 && (packet_was_encrypted == 0)
1470 && (packet_was_signed == 0))
1471 {
1472 if (printed_ignore_warning == 0)
1473 {
1474 INFO ("network plugin: Unsigned packet or "
1475 "part has been ignored.");
1476 printed_ignore_warning = 1;
1477 }
1478 buffer = ((char *) buffer) + pkg_length;
1479 buffer_size -= (size_t) pkg_length;
1480 continue;
1481 }
1482 #endif /* HAVE_LIBGCRYPT */
1483 else if (pkg_type == TYPE_VALUES)
1484 {
1485 status = parse_part_values (&buffer, &buffer_size,
1486 &vl.values, &vl.values_len);
1487 if (status != 0)
1488 break;
1490 network_dispatch_values (&vl, username);
1492 sfree (vl.values);
1493 }
1494 else if (pkg_type == TYPE_TIME)
1495 {
1496 uint64_t tmp = 0;
1497 status = parse_part_number (&buffer, &buffer_size,
1498 &tmp);
1499 if (status == 0)
1500 {
1501 vl.time = TIME_T_TO_CDTIME_T (tmp);
1502 n.time = TIME_T_TO_CDTIME_T (tmp);
1503 }
1504 }
1505 else if (pkg_type == TYPE_TIME_HR)
1506 {
1507 uint64_t tmp = 0;
1508 status = parse_part_number (&buffer, &buffer_size,
1509 &tmp);
1510 if (status == 0)
1511 {
1512 vl.time = (cdtime_t) tmp;
1513 n.time = (cdtime_t) tmp;
1514 }
1515 }
1516 else if (pkg_type == TYPE_INTERVAL)
1517 {
1518 uint64_t tmp = 0;
1519 status = parse_part_number (&buffer, &buffer_size,
1520 &tmp);
1521 if (status == 0)
1522 vl.interval = TIME_T_TO_CDTIME_T (tmp);
1523 }
1524 else if (pkg_type == TYPE_INTERVAL_HR)
1525 {
1526 uint64_t tmp = 0;
1527 status = parse_part_number (&buffer, &buffer_size,
1528 &tmp);
1529 if (status == 0)
1530 vl.interval = (cdtime_t) tmp;
1531 }
1532 else if (pkg_type == TYPE_HOST)
1533 {
1534 status = parse_part_string (&buffer, &buffer_size,
1535 vl.host, sizeof (vl.host));
1536 if (status == 0)
1537 sstrncpy (n.host, vl.host, sizeof (n.host));
1538 }
1539 else if (pkg_type == TYPE_PLUGIN)
1540 {
1541 status = parse_part_string (&buffer, &buffer_size,
1542 vl.plugin, sizeof (vl.plugin));
1543 if (status == 0)
1544 sstrncpy (n.plugin, vl.plugin,
1545 sizeof (n.plugin));
1546 }
1547 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1548 {
1549 status = parse_part_string (&buffer, &buffer_size,
1550 vl.plugin_instance,
1551 sizeof (vl.plugin_instance));
1552 if (status == 0)
1553 sstrncpy (n.plugin_instance,
1554 vl.plugin_instance,
1555 sizeof (n.plugin_instance));
1556 }
1557 else if (pkg_type == TYPE_TYPE)
1558 {
1559 status = parse_part_string (&buffer, &buffer_size,
1560 vl.type, sizeof (vl.type));
1561 if (status == 0)
1562 sstrncpy (n.type, vl.type, sizeof (n.type));
1563 }
1564 else if (pkg_type == TYPE_TYPE_INSTANCE)
1565 {
1566 status = parse_part_string (&buffer, &buffer_size,
1567 vl.type_instance,
1568 sizeof (vl.type_instance));
1569 if (status == 0)
1570 sstrncpy (n.type_instance, vl.type_instance,
1571 sizeof (n.type_instance));
1572 }
1573 else if (pkg_type == TYPE_MESSAGE)
1574 {
1575 status = parse_part_string (&buffer, &buffer_size,
1576 n.message, sizeof (n.message));
1578 if (status != 0)
1579 {
1580 /* do nothing */
1581 }
1582 else if ((n.severity != NOTIF_FAILURE)
1583 && (n.severity != NOTIF_WARNING)
1584 && (n.severity != NOTIF_OKAY))
1585 {
1586 INFO ("network plugin: "
1587 "Ignoring notification with "
1588 "unknown severity %i.",
1589 n.severity);
1590 }
1591 else if (n.time == 0)
1592 {
1593 INFO ("network plugin: "
1594 "Ignoring notification with "
1595 "time == 0.");
1596 }
1597 else if (strlen (n.message) == 0)
1598 {
1599 INFO ("network plugin: "
1600 "Ignoring notification with "
1601 "an empty message.");
1602 }
1603 else
1604 {
1605 network_dispatch_notification (&n);
1606 }
1607 }
1608 else if (pkg_type == TYPE_SEVERITY)
1609 {
1610 uint64_t tmp = 0;
1611 status = parse_part_number (&buffer, &buffer_size,
1612 &tmp);
1613 if (status == 0)
1614 n.severity = (int) tmp;
1615 }
1616 else
1617 {
1618 DEBUG ("network plugin: parse_packet: Unknown part"
1619 " type: 0x%04hx", pkg_type);
1620 buffer = ((char *) buffer) + pkg_length;
1621 buffer_size -= (size_t) pkg_length;
1622 }
1623 } /* while (buffer_size > sizeof (part_header_t)) */
1625 if (status == 0 && buffer_size > 0)
1626 WARNING ("network plugin: parse_packet: Received truncated "
1627 "packet, try increasing `MaxPacketSize'");
1629 return (status);
1630 } /* }}} int parse_packet */
1632 static void free_sockent_client (struct sockent_client *sec) /* {{{ */
1633 {
1634 if (sec->fd >= 0)
1635 {
1636 close (sec->fd);
1637 sec->fd = -1;
1638 }
1639 sfree (sec->addr);
1640 #if HAVE_LIBGCRYPT
1641 sfree (sec->username);
1642 sfree (sec->password);
1643 if (sec->cypher != NULL)
1644 gcry_cipher_close (sec->cypher);
1645 #endif
1646 } /* }}} void free_sockent_client */
1648 static void free_sockent_server (struct sockent_server *ses) /* {{{ */
1649 {
1650 for (size_t i = 0; i < ses->fd_num; i++)
1651 {
1652 if (ses->fd[i] >= 0)
1653 {
1654 close (ses->fd[i]);
1655 ses->fd[i] = -1;
1656 }
1657 }
1659 sfree (ses->fd);
1660 #if HAVE_LIBGCRYPT
1661 sfree (ses->auth_file);
1662 fbh_destroy (ses->userdb);
1663 if (ses->cypher != NULL)
1664 gcry_cipher_close (ses->cypher);
1665 #endif
1666 } /* }}} void free_sockent_server */
1668 static void sockent_destroy (sockent_t *se) /* {{{ */
1669 {
1670 sockent_t *next;
1672 DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se);
1674 while (se != NULL)
1675 {
1676 next = se->next;
1678 sfree (se->node);
1679 sfree (se->service);
1681 if (se->type == SOCKENT_TYPE_CLIENT)
1682 free_sockent_client (&se->data.client);
1683 else
1684 free_sockent_server (&se->data.server);
1686 sfree (se);
1687 se = next;
1688 }
1689 } /* }}} void sockent_destroy */
1691 /*
1692 * int network_set_ttl
1693 *
1694 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1695 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1696 *
1697 * The `struct addrinfo' is used to destinguish between unicast and multicast
1698 * sockets.
1699 */
1700 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1701 {
1702 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1703 network_config_ttl);
1705 assert (se->type == SOCKENT_TYPE_CLIENT);
1707 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1708 return (-1);
1710 if (ai->ai_family == AF_INET)
1711 {
1712 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1713 int optname;
1715 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1716 optname = IP_MULTICAST_TTL;
1717 else
1718 optname = IP_TTL;
1720 if (setsockopt (se->data.client.fd, IPPROTO_IP, optname,
1721 &network_config_ttl,
1722 sizeof (network_config_ttl)) != 0)
1723 {
1724 char errbuf[1024];
1725 ERROR ("network plugin: setsockopt (ipv4-ttl): %s",
1726 sstrerror (errno, errbuf, sizeof (errbuf)));
1727 return (-1);
1728 }
1729 }
1730 else if (ai->ai_family == AF_INET6)
1731 {
1732 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1733 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1734 int optname;
1736 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1737 optname = IPV6_MULTICAST_HOPS;
1738 else
1739 optname = IPV6_UNICAST_HOPS;
1741 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname,
1742 &network_config_ttl,
1743 sizeof (network_config_ttl)) != 0)
1744 {
1745 char errbuf[1024];
1746 ERROR ("network plugin: setsockopt(ipv6-ttl): %s",
1747 sstrerror (errno, errbuf,
1748 sizeof (errbuf)));
1749 return (-1);
1750 }
1751 }
1753 return (0);
1754 } /* int network_set_ttl */
1756 static int network_set_interface (const sockent_t *se, const struct addrinfo *ai) /* {{{ */
1757 {
1758 DEBUG ("network plugin: network_set_interface: interface index = %i;",
1759 se->interface);
1761 assert (se->type == SOCKENT_TYPE_CLIENT);
1763 if (ai->ai_family == AF_INET)
1764 {
1765 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1767 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1768 {
1769 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1770 /* If possible, use the "ip_mreqn" structure which has
1771 * an "interface index" member. Using the interface
1772 * index is preferred here, because of its similarity
1773 * to the way IPv6 handles this. Unfortunately, it
1774 * appears not to be portable. */
1775 struct ip_mreqn mreq = {
1776 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
1777 .imr_address.s_addr = ntohl (INADDR_ANY),
1778 .imr_ifindex = se->interface
1779 };
1780 #else
1781 struct ip_mreq mreq = {
1782 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
1783 .imr_interface.s_addr = ntohl (INADDR_ANY)
1784 };
1785 #endif
1787 if (setsockopt (se->data.client.fd, IPPROTO_IP, IP_MULTICAST_IF,
1788 &mreq, sizeof (mreq)) != 0)
1789 {
1790 char errbuf[1024];
1791 ERROR ("network plugin: setsockopt (ipv4-multicast-if): %s",
1792 sstrerror (errno, errbuf, sizeof (errbuf)));
1793 return (-1);
1794 }
1796 return (0);
1797 }
1798 }
1799 else if (ai->ai_family == AF_INET6)
1800 {
1801 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1803 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1804 {
1805 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
1806 &se->interface,
1807 sizeof (se->interface)) != 0)
1808 {
1809 char errbuf[1024];
1810 ERROR ("network plugin: setsockopt (ipv6-multicast-if): %s",
1811 sstrerror (errno, errbuf,
1812 sizeof (errbuf)));
1813 return (-1);
1814 }
1816 return (0);
1817 }
1818 }
1820 /* else: Not a multicast interface. */
1821 if (se->interface != 0)
1822 {
1823 #if defined(HAVE_IF_INDEXTONAME) && HAVE_IF_INDEXTONAME && defined(SO_BINDTODEVICE)
1824 char interface_name[IFNAMSIZ];
1826 if (if_indextoname (se->interface, interface_name) == NULL)
1827 return (-1);
1829 DEBUG ("network plugin: Binding socket to interface %s", interface_name);
1831 if (setsockopt (se->data.client.fd, SOL_SOCKET, SO_BINDTODEVICE,
1832 interface_name,
1833 sizeof(interface_name)) == -1 )
1834 {
1835 char errbuf[1024];
1836 ERROR ("network plugin: setsockopt (bind-if): %s",
1837 sstrerror (errno, errbuf, sizeof (errbuf)));
1838 return (-1);
1839 }
1840 /* #endif HAVE_IF_INDEXTONAME && SO_BINDTODEVICE */
1842 #else
1843 WARNING ("network plugin: Cannot set the interface on a unicast "
1844 "socket because "
1845 # if !defined(SO_BINDTODEVICE)
1846 "the \"SO_BINDTODEVICE\" socket option "
1847 # else
1848 "the \"if_indextoname\" function "
1849 # endif
1850 "is not available on your system.");
1851 #endif
1853 }
1855 return (0);
1856 } /* }}} network_set_interface */
1858 static int network_bind_socket (int fd, const struct addrinfo *ai, const int interface_idx)
1859 {
1860 #if KERNEL_SOLARIS
1861 char loop = 0;
1862 #else
1863 int loop = 0;
1864 #endif
1865 int yes = 1;
1867 /* allow multiple sockets to use the same PORT number */
1868 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
1869 &yes, sizeof(yes)) == -1) {
1870 char errbuf[1024];
1871 ERROR ("network plugin: setsockopt (reuseaddr): %s",
1872 sstrerror (errno, errbuf, sizeof (errbuf)));
1873 return (-1);
1874 }
1876 DEBUG ("fd = %i; calling `bind'", fd);
1878 if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1)
1879 {
1880 char errbuf[1024];
1881 ERROR ("bind: %s",
1882 sstrerror (errno, errbuf, sizeof (errbuf)));
1883 return (-1);
1884 }
1886 if (ai->ai_family == AF_INET)
1887 {
1888 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1889 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1890 {
1891 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1892 struct ip_mreqn mreq;
1893 #else
1894 struct ip_mreq mreq;
1895 #endif
1897 DEBUG ("fd = %i; IPv4 multicast address found", fd);
1899 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1900 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1901 /* Set the interface using the interface index if
1902 * possible (available). Unfortunately, the struct
1903 * ip_mreqn is not portable. */
1904 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
1905 mreq.imr_ifindex = interface_idx;
1906 #else
1907 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
1908 #endif
1910 if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1911 &loop, sizeof (loop)) == -1)
1912 {
1913 char errbuf[1024];
1914 ERROR ("network plugin: setsockopt (multicast-loop): %s",
1915 sstrerror (errno, errbuf,
1916 sizeof (errbuf)));
1917 return (-1);
1918 }
1920 if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1921 &mreq, sizeof (mreq)) == -1)
1922 {
1923 char errbuf[1024];
1924 ERROR ("network plugin: setsockopt (add-membership): %s",
1925 sstrerror (errno, errbuf,
1926 sizeof (errbuf)));
1927 return (-1);
1928 }
1930 return (0);
1931 }
1932 }
1933 else if (ai->ai_family == AF_INET6)
1934 {
1935 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1936 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1937 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1938 {
1939 struct ipv6_mreq mreq;
1941 DEBUG ("fd = %i; IPv6 multicast address found", fd);
1943 memcpy (&mreq.ipv6mr_multiaddr,
1944 &addr->sin6_addr,
1945 sizeof (addr->sin6_addr));
1947 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1948 * ipv6mr_interface may be set to zeroes to
1949 * choose the default multicast interface or to
1950 * the index of a particular multicast-capable
1951 * interface if the host is multihomed.
1952 * Membership is associ-associated with a
1953 * single interface; programs running on
1954 * multihomed hosts may need to join the same
1955 * group on more than one interface.*/
1956 mreq.ipv6mr_interface = interface_idx;
1958 if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1959 &loop, sizeof (loop)) == -1)
1960 {
1961 char errbuf[1024];
1962 ERROR ("network plugin: setsockopt (ipv6-multicast-loop): %s",
1963 sstrerror (errno, errbuf,
1964 sizeof (errbuf)));
1965 return (-1);
1966 }
1968 if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1969 &mreq, sizeof (mreq)) == -1)
1970 {
1971 char errbuf[1024];
1972 ERROR ("network plugin: setsockopt (ipv6-add-membership): %s",
1973 sstrerror (errno, errbuf,
1974 sizeof (errbuf)));
1975 return (-1);
1976 }
1978 return (0);
1979 }
1980 }
1982 #if defined(HAVE_IF_INDEXTONAME) && HAVE_IF_INDEXTONAME && defined(SO_BINDTODEVICE)
1983 /* if a specific interface was set, bind the socket to it. But to avoid
1984 * possible problems with multicast routing, only do that for non-multicast
1985 * addresses */
1986 if (interface_idx != 0)
1987 {
1988 char interface_name[IFNAMSIZ];
1990 if (if_indextoname (interface_idx, interface_name) == NULL)
1991 return (-1);
1993 DEBUG ("fd = %i; Binding socket to interface %s", fd, interface_name);
1995 if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
1996 interface_name,
1997 sizeof(interface_name)) == -1 )
1998 {
1999 char errbuf[1024];
2000 ERROR ("network plugin: setsockopt (bind-if): %s",
2001 sstrerror (errno, errbuf, sizeof (errbuf)));
2002 return (-1);
2003 }
2004 }
2005 #endif /* HAVE_IF_INDEXTONAME && SO_BINDTODEVICE */
2007 return (0);
2008 } /* int network_bind_socket */
2010 /* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT'
2011 * or `SOCKENT_TYPE_SERVER' */
2012 static sockent_t *sockent_create (int type) /* {{{ */
2013 {
2014 sockent_t *se;
2016 if ((type != SOCKENT_TYPE_CLIENT) && (type != SOCKENT_TYPE_SERVER))
2017 return (NULL);
2019 se = calloc (1, sizeof (*se));
2020 if (se == NULL)
2021 return (NULL);
2023 se->type = type;
2024 se->node = NULL;
2025 se->service = NULL;
2026 se->interface = 0;
2027 se->next = NULL;
2029 if (type == SOCKENT_TYPE_SERVER)
2030 {
2031 se->data.server.fd = NULL;
2032 se->data.server.fd_num = 0;
2033 #if HAVE_LIBGCRYPT
2034 se->data.server.security_level = SECURITY_LEVEL_NONE;
2035 se->data.server.auth_file = NULL;
2036 se->data.server.userdb = NULL;
2037 se->data.server.cypher = NULL;
2038 #endif
2039 }
2040 else
2041 {
2042 se->data.client.fd = -1;
2043 se->data.client.addr = NULL;
2044 se->data.client.resolve_interval = 0;
2045 se->data.client.next_resolve_reconnect = 0;
2046 #if HAVE_LIBGCRYPT
2047 se->data.client.security_level = SECURITY_LEVEL_NONE;
2048 se->data.client.username = NULL;
2049 se->data.client.password = NULL;
2050 se->data.client.cypher = NULL;
2051 #endif
2052 }
2054 return (se);
2055 } /* }}} sockent_t *sockent_create */
2057 static int sockent_init_crypto (sockent_t *se) /* {{{ */
2058 {
2059 #if HAVE_LIBGCRYPT /* {{{ */
2060 if (se->type == SOCKENT_TYPE_CLIENT)
2061 {
2062 if (se->data.client.security_level > SECURITY_LEVEL_NONE)
2063 {
2064 network_init_gcrypt ();
2066 if ((se->data.client.username == NULL)
2067 || (se->data.client.password == NULL))
2068 {
2069 ERROR ("network plugin: Client socket with "
2070 "security requested, but no "
2071 "credentials are configured.");
2072 return (-1);
2073 }
2074 gcry_md_hash_buffer (GCRY_MD_SHA256,
2075 se->data.client.password_hash,
2076 se->data.client.password,
2077 strlen (se->data.client.password));
2078 }
2079 }
2080 else /* (se->type == SOCKENT_TYPE_SERVER) */
2081 {
2082 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
2083 {
2084 network_init_gcrypt ();
2086 if (se->data.server.auth_file == NULL)
2087 {
2088 ERROR ("network plugin: Server socket with "
2089 "security requested, but no "
2090 "password file is configured.");
2091 return (-1);
2092 }
2093 }
2094 if (se->data.server.auth_file != NULL)
2095 {
2096 se->data.server.userdb = fbh_create (se->data.server.auth_file);
2097 if (se->data.server.userdb == NULL)
2098 {
2099 ERROR ("network plugin: Reading password file "
2100 "`%s' failed.",
2101 se->data.server.auth_file);
2102 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
2103 return (-1);
2104 }
2105 }
2106 }
2107 #endif /* }}} HAVE_LIBGCRYPT */
2109 return (0);
2110 } /* }}} int sockent_init_crypto */
2112 static int sockent_client_disconnect (sockent_t *se) /* {{{ */
2113 {
2114 struct sockent_client *client;
2116 if ((se == NULL) || (se->type != SOCKENT_TYPE_CLIENT))
2117 return (EINVAL);
2119 client = &se->data.client;
2120 if (client->fd >= 0) /* connected */
2121 {
2122 close (client->fd);
2123 client->fd = -1;
2124 }
2126 sfree (client->addr);
2127 client->addrlen = 0;
2129 return (0);
2130 } /* }}} int sockent_client_disconnect */
2132 static int sockent_client_connect (sockent_t *se) /* {{{ */
2133 {
2134 static c_complain_t complaint = C_COMPLAIN_INIT_STATIC;
2136 struct sockent_client *client;
2137 struct addrinfo *ai_list;
2138 int status;
2139 _Bool reconnect = 0;
2140 cdtime_t now;
2142 if ((se == NULL) || (se->type != SOCKENT_TYPE_CLIENT))
2143 return (EINVAL);
2145 client = &se->data.client;
2147 now = cdtime ();
2148 if (client->resolve_interval != 0 && client->next_resolve_reconnect < now) {
2149 DEBUG("network plugin: Reconnecting socket, resolve_interval = %lf, next_resolve_reconnect = %lf",
2150 CDTIME_T_TO_DOUBLE(client->resolve_interval), CDTIME_T_TO_DOUBLE(client->next_resolve_reconnect));
2151 reconnect = 1;
2152 }
2154 if (client->fd >= 0 && !reconnect) /* already connected and not stale*/
2155 return (0);
2157 struct addrinfo ai_hints = {
2158 .ai_family = AF_UNSPEC,
2159 .ai_flags = AI_ADDRCONFIG,
2160 .ai_protocol = IPPROTO_UDP,
2161 .ai_socktype = SOCK_DGRAM
2162 };
2164 status = getaddrinfo (se->node,
2165 (se->service != NULL) ? se->service : NET_DEFAULT_PORT,
2166 &ai_hints, &ai_list);
2167 if (status != 0)
2168 {
2169 c_complain (LOG_ERR, &complaint,
2170 "network plugin: getaddrinfo (%s, %s) failed: %s",
2171 (se->node == NULL) ? "(null)" : se->node,
2172 (se->service == NULL) ? "(null)" : se->service,
2173 gai_strerror (status));
2174 return (-1);
2175 }
2176 else
2177 {
2178 c_release (LOG_NOTICE, &complaint,
2179 "network plugin: Successfully resolved \"%s\".",
2180 se->node);
2181 }
2183 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2184 {
2185 if (client->fd >= 0) /* when we reconnect */
2186 sockent_client_disconnect(se);
2188 client->fd = socket (ai_ptr->ai_family,
2189 ai_ptr->ai_socktype,
2190 ai_ptr->ai_protocol);
2191 if (client->fd < 0)
2192 {
2193 char errbuf[1024];
2194 ERROR ("network plugin: socket(2) failed: %s",
2195 sstrerror (errno, errbuf,
2196 sizeof (errbuf)));
2197 continue;
2198 }
2200 client->addr = calloc (1, sizeof (*client->addr));
2201 if (client->addr == NULL)
2202 {
2203 ERROR ("network plugin: calloc failed.");
2204 close (client->fd);
2205 client->fd = -1;
2206 continue;
2207 }
2209 assert (sizeof (*client->addr) >= ai_ptr->ai_addrlen);
2210 memcpy (client->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
2211 client->addrlen = ai_ptr->ai_addrlen;
2213 network_set_ttl (se, ai_ptr);
2214 network_set_interface (se, ai_ptr);
2216 /* We don't open more than one write-socket per
2217 * node/service pair.. */
2218 break;
2219 }
2221 freeaddrinfo (ai_list);
2222 if (client->fd < 0)
2223 return (-1);
2225 if (client->resolve_interval > 0)
2226 client->next_resolve_reconnect = now + client->resolve_interval;
2227 return (0);
2228 } /* }}} int sockent_client_connect */
2230 /* Open the file descriptors for a initialized sockent structure. */
2231 static int sockent_server_listen (sockent_t *se) /* {{{ */
2232 {
2233 struct addrinfo *ai_list;
2234 int status;
2236 const char *node;
2237 const char *service;
2239 if (se == NULL)
2240 return (-1);
2242 assert (se->data.server.fd == NULL);
2243 assert (se->data.server.fd_num == 0);
2245 node = se->node;
2246 service = se->service;
2248 if (service == NULL)
2249 service = NET_DEFAULT_PORT;
2251 DEBUG ("network plugin: sockent_server_listen: node = %s; service = %s;",
2252 node, service);
2254 struct addrinfo ai_hints = {
2255 .ai_family = AF_UNSPEC,
2256 .ai_flags = AI_ADDRCONFIG | AI_PASSIVE,
2257 .ai_protocol = IPPROTO_UDP,
2258 .ai_socktype = SOCK_DGRAM
2259 };
2261 status = getaddrinfo (node, service, &ai_hints, &ai_list);
2262 if (status != 0)
2263 {
2264 ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s",
2265 (se->node == NULL) ? "(null)" : se->node,
2266 (se->service == NULL) ? "(null)" : se->service,
2267 gai_strerror (status));
2268 return (-1);
2269 }
2271 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2272 {
2273 int *tmp;
2275 tmp = realloc (se->data.server.fd,
2276 sizeof (*tmp) * (se->data.server.fd_num + 1));
2277 if (tmp == NULL)
2278 {
2279 ERROR ("network plugin: realloc failed.");
2280 continue;
2281 }
2282 se->data.server.fd = tmp;
2283 tmp = se->data.server.fd + se->data.server.fd_num;
2285 *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
2286 ai_ptr->ai_protocol);
2287 if (*tmp < 0)
2288 {
2289 char errbuf[1024];
2290 ERROR ("network plugin: socket(2) failed: %s",
2291 sstrerror (errno, errbuf,
2292 sizeof (errbuf)));
2293 continue;
2294 }
2296 status = network_bind_socket (*tmp, ai_ptr, se->interface);
2297 if (status != 0)
2298 {
2299 close (*tmp);
2300 *tmp = -1;
2301 continue;
2302 }
2304 se->data.server.fd_num++;
2305 continue;
2306 } /* for (ai_list) */
2308 freeaddrinfo (ai_list);
2310 if (se->data.server.fd_num == 0)
2311 return (-1);
2312 return (0);
2313 } /* }}} int sockent_server_listen */
2315 /* Add a sockent to the global list of sockets */
2316 static int sockent_add (sockent_t *se) /* {{{ */
2317 {
2318 sockent_t *last_ptr;
2320 if (se == NULL)
2321 return (-1);
2323 if (se->type == SOCKENT_TYPE_SERVER)
2324 {
2325 struct pollfd *tmp;
2327 tmp = realloc (listen_sockets_pollfd,
2328 sizeof (*tmp) * (listen_sockets_num
2329 + se->data.server.fd_num));
2330 if (tmp == NULL)
2331 {
2332 ERROR ("network plugin: realloc failed.");
2333 return (-1);
2334 }
2335 listen_sockets_pollfd = tmp;
2336 tmp = listen_sockets_pollfd + listen_sockets_num;
2338 for (size_t i = 0; i < se->data.server.fd_num; i++)
2339 {
2340 memset (tmp + i, 0, sizeof (*tmp));
2341 tmp[i].fd = se->data.server.fd[i];
2342 tmp[i].events = POLLIN | POLLPRI;
2343 tmp[i].revents = 0;
2344 }
2346 listen_sockets_num += se->data.server.fd_num;
2348 if (listen_sockets == NULL)
2349 {
2350 listen_sockets = se;
2351 return (0);
2352 }
2353 last_ptr = listen_sockets;
2354 }
2355 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
2356 {
2357 if (sending_sockets == NULL)
2358 {
2359 sending_sockets = se;
2360 return (0);
2361 }
2362 last_ptr = sending_sockets;
2363 }
2365 while (last_ptr->next != NULL)
2366 last_ptr = last_ptr->next;
2367 last_ptr->next = se;
2369 return (0);
2370 } /* }}} int sockent_add */
2372 static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */
2373 {
2374 while (42)
2375 {
2376 receive_list_entry_t *ent;
2377 sockent_t *se;
2379 /* Lock and wait for more data to come in */
2380 pthread_mutex_lock (&receive_list_lock);
2381 while ((listen_loop == 0)
2382 && (receive_list_head == NULL))
2383 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
2385 /* Remove the head entry and unlock */
2386 ent = receive_list_head;
2387 if (ent != NULL)
2388 receive_list_head = ent->next;
2389 receive_list_length--;
2390 pthread_mutex_unlock (&receive_list_lock);
2392 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
2393 * because we dispatch all missing packets before shutting down. */
2394 if (ent == NULL)
2395 break;
2397 /* Look for the correct `sockent_t' */
2398 se = listen_sockets;
2399 while (se != NULL)
2400 {
2401 size_t i;
2403 for (i = 0; i < se->data.server.fd_num; i++)
2404 if (se->data.server.fd[i] == ent->fd)
2405 break;
2407 if (i < se->data.server.fd_num)
2408 break;
2410 se = se->next;
2411 }
2413 if (se == NULL)
2414 {
2415 ERROR ("network plugin: Got packet from FD %i, but can't "
2416 "find an appropriate socket entry.",
2417 ent->fd);
2418 sfree (ent->data);
2419 sfree (ent);
2420 continue;
2421 }
2423 parse_packet (se, ent->data, ent->data_len, /* flags = */ 0,
2424 /* username = */ NULL);
2425 sfree (ent->data);
2426 sfree (ent);
2427 } /* while (42) */
2429 return (NULL);
2430 } /* }}} void *dispatch_thread */
2432 static int network_receive (void) /* {{{ */
2433 {
2434 char buffer[network_config_packet_size];
2435 int buffer_len;
2437 int status = 0;
2439 receive_list_entry_t *private_list_head;
2440 receive_list_entry_t *private_list_tail;
2441 uint64_t private_list_length;
2443 assert (listen_sockets_num > 0);
2445 private_list_head = NULL;
2446 private_list_tail = NULL;
2447 private_list_length = 0;
2449 while (listen_loop == 0)
2450 {
2451 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
2452 if (status <= 0)
2453 {
2454 char errbuf[1024];
2455 if (errno == EINTR)
2456 continue;
2457 ERROR ("network plugin: poll(2) failed: %s",
2458 sstrerror (errno, errbuf, sizeof (errbuf)));
2459 break;
2460 }
2462 for (size_t i = 0; (i < listen_sockets_num) && (status > 0); i++)
2463 {
2464 receive_list_entry_t *ent;
2466 if ((listen_sockets_pollfd[i].revents
2467 & (POLLIN | POLLPRI)) == 0)
2468 continue;
2469 status--;
2471 buffer_len = recv (listen_sockets_pollfd[i].fd,
2472 buffer, sizeof (buffer),
2473 0 /* no flags */);
2474 if (buffer_len < 0)
2475 {
2476 char errbuf[1024];
2477 status = (errno != 0) ? errno : -1;
2478 ERROR ("network plugin: recv(2) failed: %s",
2479 sstrerror (errno, errbuf, sizeof (errbuf)));
2480 break;
2481 }
2483 stats_octets_rx += ((uint64_t) buffer_len);
2484 stats_packets_rx++;
2486 /* TODO: Possible performance enhancement: Do not free
2487 * these entries in the dispatch thread but put them in
2488 * another list, so we don't have to allocate more and
2489 * more of these structures. */
2490 ent = calloc (1, sizeof (*ent));
2491 if (ent == NULL)
2492 {
2493 ERROR ("network plugin: calloc failed.");
2494 status = ENOMEM;
2495 break;
2496 }
2498 ent->data = malloc (network_config_packet_size);
2499 if (ent->data == NULL)
2500 {
2501 sfree (ent);
2502 ERROR ("network plugin: malloc failed.");
2503 status = ENOMEM;
2504 break;
2505 }
2506 ent->fd = listen_sockets_pollfd[i].fd;
2507 ent->next = NULL;
2509 memcpy (ent->data, buffer, buffer_len);
2510 ent->data_len = buffer_len;
2512 if (private_list_head == NULL)
2513 private_list_head = ent;
2514 else
2515 private_list_tail->next = ent;
2516 private_list_tail = ent;
2517 private_list_length++;
2519 /* Do not block here. Blocking here has led to
2520 * insufficient performance in the past. */
2521 if (pthread_mutex_trylock (&receive_list_lock) == 0)
2522 {
2523 assert (((receive_list_head == NULL) && (receive_list_length == 0))
2524 || ((receive_list_head != NULL) && (receive_list_length != 0)));
2526 if (receive_list_head == NULL)
2527 receive_list_head = private_list_head;
2528 else
2529 receive_list_tail->next = private_list_head;
2530 receive_list_tail = private_list_tail;
2531 receive_list_length += private_list_length;
2533 pthread_cond_signal (&receive_list_cond);
2534 pthread_mutex_unlock (&receive_list_lock);
2536 private_list_head = NULL;
2537 private_list_tail = NULL;
2538 private_list_length = 0;
2539 }
2541 status = 0;
2542 } /* for (listen_sockets_pollfd) */
2544 if (status != 0)
2545 break;
2546 } /* while (listen_loop == 0) */
2548 /* Make sure everything is dispatched before exiting. */
2549 if (private_list_head != NULL)
2550 {
2551 pthread_mutex_lock (&receive_list_lock);
2553 if (receive_list_head == NULL)
2554 receive_list_head = private_list_head;
2555 else
2556 receive_list_tail->next = private_list_head;
2557 receive_list_tail = private_list_tail;
2558 receive_list_length += private_list_length;
2560 pthread_cond_signal (&receive_list_cond);
2561 pthread_mutex_unlock (&receive_list_lock);
2562 }
2564 return (status);
2565 } /* }}} int network_receive */
2567 static void *receive_thread (void __attribute__((unused)) *arg)
2568 {
2569 return (network_receive () ? (void *) 1 : (void *) 0);
2570 } /* void *receive_thread */
2572 static void network_init_buffer (void)
2573 {
2574 memset (send_buffer, 0, network_config_packet_size);
2575 send_buffer_ptr = send_buffer;
2576 send_buffer_fill = 0;
2577 send_buffer_last_update = 0;
2579 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
2580 } /* int network_init_buffer */
2582 static void network_send_buffer_plain (sockent_t *se, /* {{{ */
2583 const char *buffer, size_t buffer_size)
2584 {
2585 int status;
2587 while (42)
2588 {
2589 status = sockent_client_connect (se);
2590 if (status != 0)
2591 return;
2593 status = sendto (se->data.client.fd, buffer, buffer_size,
2594 /* flags = */ 0,
2595 (struct sockaddr *) se->data.client.addr,
2596 se->data.client.addrlen);
2597 if (status < 0)
2598 {
2599 char errbuf[1024];
2601 if ((errno == EINTR) || (errno == EAGAIN))
2602 continue;
2604 ERROR ("network plugin: sendto failed: %s. Closing sending socket.",
2605 sstrerror (errno, errbuf, sizeof (errbuf)));
2606 sockent_client_disconnect (se);
2607 return;
2608 }
2610 break;
2611 } /* while (42) */
2612 } /* }}} void network_send_buffer_plain */
2614 #if HAVE_LIBGCRYPT
2615 #define BUFFER_ADD(p,s) do { \
2616 memcpy (buffer + buffer_offset, (p), (s)); \
2617 buffer_offset += (s); \
2618 } while (0)
2620 static void network_send_buffer_signed (sockent_t *se, /* {{{ */
2621 const char *in_buffer, size_t in_buffer_size)
2622 {
2623 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2624 size_t buffer_offset;
2625 size_t username_len;
2627 gcry_md_hd_t hd;
2628 gcry_error_t err;
2629 unsigned char *hash;
2631 hd = NULL;
2632 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
2633 if (err != 0)
2634 {
2635 ERROR ("network plugin: Creating HMAC object failed: %s",
2636 gcry_strerror (err));
2637 return;
2638 }
2640 err = gcry_md_setkey (hd, se->data.client.password,
2641 strlen (se->data.client.password));
2642 if (err != 0)
2643 {
2644 ERROR ("network plugin: gcry_md_setkey failed: %s",
2645 gcry_strerror (err));
2646 gcry_md_close (hd);
2647 return;
2648 }
2650 username_len = strlen (se->data.client.username);
2651 if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE))
2652 {
2653 ERROR ("network plugin: Username too long: %s",
2654 se->data.client.username);
2655 return;
2656 }
2658 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE,
2659 se->data.client.username, username_len);
2660 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len,
2661 in_buffer, in_buffer_size);
2663 /* Initialize the `ps' structure. */
2664 part_signature_sha256_t ps = {
2665 .head.type = htons (TYPE_SIGN_SHA256),
2666 .head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len)
2667 };
2669 /* Calculate the hash value. */
2670 gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE,
2671 username_len + in_buffer_size);
2672 hash = gcry_md_read (hd, GCRY_MD_SHA256);
2673 if (hash == NULL)
2674 {
2675 ERROR ("network plugin: gcry_md_read failed.");
2676 gcry_md_close (hd);
2677 return;
2678 }
2679 memcpy (ps.hash, hash, sizeof (ps.hash));
2681 /* Add the header */
2682 buffer_offset = 0;
2684 BUFFER_ADD (&ps.head.type, sizeof (ps.head.type));
2685 BUFFER_ADD (&ps.head.length, sizeof (ps.head.length));
2686 BUFFER_ADD (ps.hash, sizeof (ps.hash));
2688 assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE);
2690 gcry_md_close (hd);
2691 hd = NULL;
2693 buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size;
2694 network_send_buffer_plain (se, buffer, buffer_offset);
2695 } /* }}} void network_send_buffer_signed */
2697 static void network_send_buffer_encrypted (sockent_t *se, /* {{{ */
2698 const char *in_buffer, size_t in_buffer_size)
2699 {
2700 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2701 size_t buffer_size;
2702 size_t buffer_offset;
2703 size_t header_size;
2704 size_t username_len;
2705 gcry_error_t err;
2706 gcry_cipher_hd_t cypher;
2708 /* Initialize the header fields */
2709 part_encryption_aes256_t pea = {
2710 .head.type = htons (TYPE_ENCR_AES256),
2711 .username = se->data.client.username
2712 };
2714 username_len = strlen (pea.username);
2715 if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE)
2716 {
2717 ERROR ("network plugin: Username too long: %s", pea.username);
2718 return;
2719 }
2721 buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size;
2722 header_size = PART_ENCRYPTION_AES256_SIZE + username_len
2723 - sizeof (pea.hash);
2725 assert (buffer_size <= sizeof (buffer));
2726 DEBUG ("network plugin: network_send_buffer_encrypted: "
2727 "buffer_size = %zu;", buffer_size);
2729 pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE
2730 + username_len + in_buffer_size));
2731 pea.username_length = htons ((uint16_t) username_len);
2733 /* Chose a random initialization vector. */
2734 gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2736 /* Create hash of the payload */
2737 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2739 /* Initialize the buffer */
2740 buffer_offset = 0;
2741 memset (buffer, 0, sizeof (buffer));
2744 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2745 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2746 BUFFER_ADD (&pea.username_length, sizeof (pea.username_length));
2747 BUFFER_ADD (pea.username, username_len);
2748 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2749 assert (buffer_offset == header_size);
2750 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2751 BUFFER_ADD (in_buffer, in_buffer_size);
2753 assert (buffer_offset == buffer_size);
2755 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
2756 se->data.client.password);
2757 if (cypher == NULL)
2758 return;
2760 /* Encrypt the buffer in-place */
2761 err = gcry_cipher_encrypt (cypher,
2762 buffer + header_size,
2763 buffer_size - header_size,
2764 /* in = */ NULL, /* in len = */ 0);
2765 if (err != 0)
2766 {
2767 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2768 gcry_strerror (err));
2769 return;
2770 }
2772 /* Send it out without further modifications */
2773 network_send_buffer_plain (se, buffer, buffer_size);
2774 } /* }}} void network_send_buffer_encrypted */
2775 #undef BUFFER_ADD
2776 #endif /* HAVE_LIBGCRYPT */
2778 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2779 {
2780 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2782 for (sockent_t *se = sending_sockets; se != NULL; se = se->next)
2783 {
2784 #if HAVE_LIBGCRYPT
2785 if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT)
2786 network_send_buffer_encrypted (se, buffer, buffer_len);
2787 else if (se->data.client.security_level == SECURITY_LEVEL_SIGN)
2788 network_send_buffer_signed (se, buffer, buffer_len);
2789 else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */
2790 #endif /* HAVE_LIBGCRYPT */
2791 network_send_buffer_plain (se, buffer, buffer_len);
2792 } /* for (sending_sockets) */
2793 } /* }}} void network_send_buffer */
2795 static int add_to_buffer (char *buffer, size_t buffer_size, /* {{{ */
2796 value_list_t *vl_def,
2797 const data_set_t *ds, const value_list_t *vl)
2798 {
2799 char *buffer_orig = buffer;
2801 if (strcmp (vl_def->host, vl->host) != 0)
2802 {
2803 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2804 vl->host, strlen (vl->host)) != 0)
2805 return (-1);
2806 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2807 }
2809 if (vl_def->time != vl->time)
2810 {
2811 if (write_part_number (&buffer, &buffer_size, TYPE_TIME_HR,
2812 (uint64_t) vl->time))
2813 return (-1);
2814 vl_def->time = vl->time;
2815 }
2817 if (vl_def->interval != vl->interval)
2818 {
2819 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL_HR,
2820 (uint64_t) vl->interval))
2821 return (-1);
2822 vl_def->interval = vl->interval;
2823 }
2825 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2826 {
2827 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2828 vl->plugin, strlen (vl->plugin)) != 0)
2829 return (-1);
2830 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2831 }
2833 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2834 {
2835 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2836 vl->plugin_instance,
2837 strlen (vl->plugin_instance)) != 0)
2838 return (-1);
2839 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2840 }
2842 if (strcmp (vl_def->type, vl->type) != 0)
2843 {
2844 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2845 vl->type, strlen (vl->type)) != 0)
2846 return (-1);
2847 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2848 }
2850 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2851 {
2852 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2853 vl->type_instance,
2854 strlen (vl->type_instance)) != 0)
2855 return (-1);
2856 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2857 }
2859 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2860 return (-1);
2862 return (buffer - buffer_orig);
2863 } /* }}} int add_to_buffer */
2865 static void flush_buffer (void)
2866 {
2867 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2868 send_buffer_fill);
2870 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2872 stats_octets_tx += ((uint64_t) send_buffer_fill);
2873 stats_packets_tx++;
2875 network_init_buffer ();
2876 }
2878 static int network_write (const data_set_t *ds, const value_list_t *vl,
2879 user_data_t __attribute__((unused)) *user_data)
2880 {
2881 int status;
2883 if (!check_send_okay (vl))
2884 {
2885 #if COLLECT_DEBUG
2886 char name[6*DATA_MAX_NAME_LEN];
2887 FORMAT_VL (name, sizeof (name), vl);
2888 name[sizeof (name) - 1] = 0;
2889 DEBUG ("network plugin: network_write: "
2890 "NOT sending %s.", name);
2891 #endif
2892 /* Counter is not protected by another lock and may be reached by
2893 * multiple threads */
2894 pthread_mutex_lock (&stats_lock);
2895 stats_values_not_sent++;
2896 pthread_mutex_unlock (&stats_lock);
2897 return (0);
2898 }
2900 uc_meta_data_add_unsigned_int (vl,
2901 "network:time_sent", (uint64_t) vl->time);
2903 pthread_mutex_lock (&send_buffer_lock);
2905 status = add_to_buffer (send_buffer_ptr,
2906 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2907 &send_buffer_vl,
2908 ds, vl);
2909 if (status >= 0)
2910 {
2911 /* status == bytes added to the buffer */
2912 send_buffer_fill += status;
2913 send_buffer_ptr += status;
2914 send_buffer_last_update = cdtime();
2916 stats_values_sent++;
2917 }
2918 else
2919 {
2920 flush_buffer ();
2922 status = add_to_buffer (send_buffer_ptr,
2923 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2924 &send_buffer_vl,
2925 ds, vl);
2927 if (status >= 0)
2928 {
2929 send_buffer_fill += status;
2930 send_buffer_ptr += status;
2932 stats_values_sent++;
2933 }
2934 }
2936 if (status < 0)
2937 {
2938 ERROR ("network plugin: Unable to append to the "
2939 "buffer for some weird reason");
2940 }
2941 else if ((network_config_packet_size - send_buffer_fill) < 15)
2942 {
2943 flush_buffer ();
2944 }
2946 pthread_mutex_unlock (&send_buffer_lock);
2948 return ((status < 0) ? -1 : 0);
2949 } /* int network_write */
2951 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2952 {
2953 int tmp = 0;
2955 if (cf_util_get_int (ci, &tmp) != 0)
2956 return (-1);
2957 else if ((tmp > 0) && (tmp <= 255))
2958 network_config_ttl = tmp;
2959 else {
2960 WARNING ("network plugin: The `TimeToLive' must be between 1 and 255.");
2961 return (-1);
2962 }
2964 return (0);
2965 } /* }}} int network_config_set_ttl */
2967 static int network_config_set_interface (const oconfig_item_t *ci, /* {{{ */
2968 int *interface)
2969 {
2970 char if_name[256];
2972 if (cf_util_get_string_buffer (ci, if_name, sizeof (if_name)) != 0)
2973 return (-1);
2975 *interface = if_nametoindex (if_name);
2976 return (0);
2977 } /* }}} int network_config_set_interface */
2979 static int network_config_set_buffer_size (const oconfig_item_t *ci) /* {{{ */
2980 {
2981 int tmp = 0;
2983 if (cf_util_get_int (ci, &tmp) != 0)
2984 return (-1);
2985 else if ((tmp >= 1024) && (tmp <= 65535))
2986 network_config_packet_size = tmp;
2987 else {
2988 WARNING ("network plugin: The `MaxPacketSize' must be between 1024 and 65535.");
2989 return (-1);
2990 }
2992 return (0);
2993 } /* }}} int network_config_set_buffer_size */
2995 #if HAVE_LIBGCRYPT
2996 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
2997 int *retval)
2998 {
2999 char *str;
3000 if ((ci->values_num != 1)
3001 || (ci->values[0].type != OCONFIG_TYPE_STRING))
3002 {
3003 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
3004 "one string argument.");
3005 return (-1);
3006 }
3008 str = ci->values[0].value.string;
3009 if (strcasecmp ("Encrypt", str) == 0)
3010 *retval = SECURITY_LEVEL_ENCRYPT;
3011 else if (strcasecmp ("Sign", str) == 0)
3012 *retval = SECURITY_LEVEL_SIGN;
3013 else if (strcasecmp ("None", str) == 0)
3014 *retval = SECURITY_LEVEL_NONE;
3015 else
3016 {
3017 WARNING ("network plugin: Unknown security level: %s.", str);
3018 return (-1);
3019 }
3021 return (0);
3022 } /* }}} int network_config_set_security_level */
3023 #endif /* HAVE_LIBGCRYPT */
3025 static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */
3026 {
3027 sockent_t *se;
3028 int status;
3030 if ((ci->values_num < 1) || (ci->values_num > 2)
3031 || (ci->values[0].type != OCONFIG_TYPE_STRING)
3032 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
3033 {
3034 ERROR ("network plugin: The `%s' config option needs "
3035 "one or two string arguments.", ci->key);
3036 return (-1);
3037 }
3039 se = sockent_create (SOCKENT_TYPE_SERVER);
3040 if (se == NULL)
3041 {
3042 ERROR ("network plugin: sockent_create failed.");
3043 return (-1);
3044 }
3046 se->node = strdup (ci->values[0].value.string);
3047 if (ci->values_num >= 2)
3048 se->service = strdup (ci->values[1].value.string);
3050 for (int i = 0; i < ci->children_num; i++)
3051 {
3052 oconfig_item_t *child = ci->children + i;
3054 #if HAVE_LIBGCRYPT
3055 if (strcasecmp ("AuthFile", child->key) == 0)
3056 cf_util_get_string (child, &se->data.server.auth_file);
3057 else if (strcasecmp ("SecurityLevel", child->key) == 0)
3058 network_config_set_security_level (child,
3059 &se->data.server.security_level);
3060 else
3061 #endif /* HAVE_LIBGCRYPT */
3062 if (strcasecmp ("Interface", child->key) == 0)
3063 network_config_set_interface (child, &se->interface);
3064 else
3065 {
3066 WARNING ("network plugin: Option `%s' is not allowed here.",
3067 child->key);
3068 }
3069 }
3071 #if HAVE_LIBGCRYPT
3072 if ((se->data.server.security_level > SECURITY_LEVEL_NONE)
3073 && (se->data.server.auth_file == NULL))
3074 {
3075 ERROR ("network plugin: A security level higher than `none' was "
3076 "requested, but no AuthFile option was given. Cowardly refusing to "
3077 "open this socket!");
3078 sockent_destroy (se);
3079 return (-1);
3080 }
3081 #endif /* HAVE_LIBGCRYPT */
3083 status = sockent_init_crypto (se);
3084 if (status != 0)
3085 {
3086 ERROR ("network plugin: network_config_add_listen: sockent_init_crypto() failed.");
3087 sockent_destroy (se);
3088 return (-1);
3089 }
3091 status = sockent_server_listen (se);
3092 if (status != 0)
3093 {
3094 ERROR ("network plugin: network_config_add_listen: sockent_server_listen failed.");
3095 sockent_destroy (se);
3096 return (-1);
3097 }
3099 status = sockent_add (se);
3100 if (status != 0)
3101 {
3102 ERROR ("network plugin: network_config_add_listen: sockent_add failed.");
3103 sockent_destroy (se);
3104 return (-1);
3105 }
3107 return (0);
3108 } /* }}} int network_config_add_listen */
3110 static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */
3111 {
3112 sockent_t *se;
3113 int status;
3115 if ((ci->values_num < 1) || (ci->values_num > 2)
3116 || (ci->values[0].type != OCONFIG_TYPE_STRING)
3117 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
3118 {
3119 ERROR ("network plugin: The `%s' config option needs "
3120 "one or two string arguments.", ci->key);
3121 return (-1);
3122 }
3124 se = sockent_create (SOCKENT_TYPE_CLIENT);
3125 if (se == NULL)
3126 {
3127 ERROR ("network plugin: sockent_create failed.");
3128 return (-1);
3129 }
3131 se->node = strdup (ci->values[0].value.string);
3132 if (ci->values_num >= 2)
3133 se->service = strdup (ci->values[1].value.string);
3135 for (int i = 0; i < ci->children_num; i++)
3136 {
3137 oconfig_item_t *child = ci->children + i;
3139 #if HAVE_LIBGCRYPT
3140 if (strcasecmp ("Username", child->key) == 0)
3141 cf_util_get_string (child, &se->data.client.username);
3142 else if (strcasecmp ("Password", child->key) == 0)
3143 cf_util_get_string (child, &se->data.client.password);
3144 else if (strcasecmp ("SecurityLevel", child->key) == 0)
3145 network_config_set_security_level (child,
3146 &se->data.client.security_level);
3147 else
3148 #endif /* HAVE_LIBGCRYPT */
3149 if (strcasecmp ("Interface", child->key) == 0)
3150 network_config_set_interface (child, &se->interface);
3151 else if (strcasecmp ("ResolveInterval", child->key) == 0)
3152 cf_util_get_cdtime(child, &se->data.client.resolve_interval);
3153 else
3154 {
3155 WARNING ("network plugin: Option `%s' is not allowed here.",
3156 child->key);
3157 }
3158 }
3160 #if HAVE_LIBGCRYPT
3161 if ((se->data.client.security_level > SECURITY_LEVEL_NONE)
3162 && ((se->data.client.username == NULL)
3163 || (se->data.client.password == NULL)))
3164 {
3165 ERROR ("network plugin: A security level higher than `none' was "
3166 "requested, but no Username or Password option was given. "
3167 "Cowardly refusing to open this socket!");
3168 sockent_destroy (se);
3169 return (-1);
3170 }
3171 #endif /* HAVE_LIBGCRYPT */
3173 status = sockent_init_crypto (se);
3174 if (status != 0)
3175 {
3176 ERROR ("network plugin: network_config_add_server: sockent_init_crypto() failed.");
3177 sockent_destroy (se);
3178 return (-1);
3179 }
3181 /* No call to sockent_client_connect() here -- it is called from
3182 * network_send_buffer_plain(). */
3184 status = sockent_add (se);
3185 if (status != 0)
3186 {
3187 ERROR ("network plugin: network_config_add_server: sockent_add failed.");
3188 sockent_destroy (se);
3189 return (-1);
3190 }
3192 return (0);
3193 } /* }}} int network_config_add_server */
3195 static int network_config (oconfig_item_t *ci) /* {{{ */
3196 {
3197 /* The options need to be applied first */
3198 for (int i = 0; i < ci->children_num; i++)
3199 {
3200 oconfig_item_t *child = ci->children + i;
3201 if (strcasecmp ("TimeToLive", child->key) == 0)
3202 network_config_set_ttl (child);
3203 }
3205 for (int i = 0; i < ci->children_num; i++)
3206 {
3207 oconfig_item_t *child = ci->children + i;
3209 if (strcasecmp ("Listen", child->key) == 0)
3210 network_config_add_listen (child);
3211 else if (strcasecmp ("Server", child->key) == 0)
3212 network_config_add_server (child);
3213 else if (strcasecmp ("TimeToLive", child->key) == 0) {
3214 /* Handled earlier */
3215 }
3216 else if (strcasecmp ("MaxPacketSize", child->key) == 0)
3217 network_config_set_buffer_size (child);
3218 else if (strcasecmp ("Forward", child->key) == 0)
3219 cf_util_get_boolean (child, &network_config_forward);
3220 else if (strcasecmp ("ReportStats", child->key) == 0)
3221 cf_util_get_boolean (child, &network_config_stats);
3222 else
3223 {
3224 WARNING ("network plugin: Option `%s' is not allowed here.",
3225 child->key);
3226 }
3227 }
3229 return (0);
3230 } /* }}} int network_config */
3232 static int network_notification (const notification_t *n,
3233 user_data_t __attribute__((unused)) *user_data)
3234 {
3235 char buffer[network_config_packet_size];
3236 char *buffer_ptr = buffer;
3237 size_t buffer_free = sizeof (buffer);
3238 int status;
3240 if (!check_send_notify_okay (n))
3241 return (0);
3243 memset (buffer, 0, sizeof (buffer));
3245 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME_HR,
3246 (uint64_t) n->time);
3247 if (status != 0)
3248 return (-1);
3250 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
3251 (uint64_t) n->severity);
3252 if (status != 0)
3253 return (-1);
3255 if (strlen (n->host) > 0)
3256 {
3257 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
3258 n->host, strlen (n->host));
3259 if (status != 0)
3260 return (-1);
3261 }
3263 if (strlen (n->plugin) > 0)
3264 {
3265 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
3266 n->plugin, strlen (n->plugin));
3267 if (status != 0)
3268 return (-1);
3269 }
3271 if (strlen (n->plugin_instance) > 0)
3272 {
3273 status = write_part_string (&buffer_ptr, &buffer_free,
3274 TYPE_PLUGIN_INSTANCE,
3275 n->plugin_instance, strlen (n->plugin_instance));
3276 if (status != 0)
3277 return (-1);
3278 }
3280 if (strlen (n->type) > 0)
3281 {
3282 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
3283 n->type, strlen (n->type));
3284 if (status != 0)
3285 return (-1);
3286 }
3288 if (strlen (n->type_instance) > 0)
3289 {
3290 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
3291 n->type_instance, strlen (n->type_instance));
3292 if (status != 0)
3293 return (-1);
3294 }
3296 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
3297 n->message, strlen (n->message));
3298 if (status != 0)
3299 return (-1);
3301 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
3303 return (0);
3304 } /* int network_notification */
3306 static int network_shutdown (void)
3307 {
3308 listen_loop++;
3310 /* Kill the listening thread */
3311 if (receive_thread_running != 0)
3312 {
3313 INFO ("network plugin: Stopping receive thread.");
3314 pthread_kill (receive_thread_id, SIGTERM);
3315 pthread_join (receive_thread_id, NULL /* no return value */);
3316 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
3317 receive_thread_running = 0;
3318 }
3320 /* Shutdown the dispatching thread */
3321 if (dispatch_thread_running != 0)
3322 {
3323 INFO ("network plugin: Stopping dispatch thread.");
3324 pthread_mutex_lock (&receive_list_lock);
3325 pthread_cond_broadcast (&receive_list_cond);
3326 pthread_mutex_unlock (&receive_list_lock);
3327 pthread_join (dispatch_thread_id, /* ret = */ NULL);
3328 dispatch_thread_running = 0;
3329 }
3331 sockent_destroy (listen_sockets);
3333 if (send_buffer_fill > 0)
3334 flush_buffer ();
3336 sfree (send_buffer);
3338 for (sockent_t *se = sending_sockets; se != NULL; se = se->next)
3339 sockent_client_disconnect (se);
3340 sockent_destroy (sending_sockets);
3342 plugin_unregister_config ("network");
3343 plugin_unregister_init ("network");
3344 plugin_unregister_write ("network");
3345 plugin_unregister_shutdown ("network");
3347 return (0);
3348 } /* int network_shutdown */
3350 static int network_stats_read (void) /* {{{ */
3351 {
3352 derive_t copy_octets_rx;
3353 derive_t copy_octets_tx;
3354 derive_t copy_packets_rx;
3355 derive_t copy_packets_tx;
3356 derive_t copy_values_dispatched;
3357 derive_t copy_values_not_dispatched;
3358 derive_t copy_values_sent;
3359 derive_t copy_values_not_sent;
3360 derive_t copy_receive_list_length;
3361 value_list_t vl = VALUE_LIST_INIT;
3362 value_t values[2];
3364 copy_octets_rx = stats_octets_rx;
3365 copy_octets_tx = stats_octets_tx;
3366 copy_packets_rx = stats_packets_rx;
3367 copy_packets_tx = stats_packets_tx;
3368 copy_values_dispatched = stats_values_dispatched;
3369 copy_values_not_dispatched = stats_values_not_dispatched;
3370 copy_values_sent = stats_values_sent;
3371 copy_values_not_sent = stats_values_not_sent;
3372 copy_receive_list_length = receive_list_length;
3374 /* Initialize `vl' */
3375 vl.values = values;
3376 vl.values_len = 2;
3377 vl.time = 0;
3378 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
3379 sstrncpy (vl.plugin, "network", sizeof (vl.plugin));
3381 /* Octets received / sent */
3382 vl.values[0].derive = (derive_t) copy_octets_rx;
3383 vl.values[1].derive = (derive_t) copy_octets_tx;
3384 sstrncpy (vl.type, "if_octets", sizeof (vl.type));
3385 plugin_dispatch_values (&vl);
3387 /* Packets received / send */
3388 vl.values[0].derive = (derive_t) copy_packets_rx;
3389 vl.values[1].derive = (derive_t) copy_packets_tx;
3390 sstrncpy (vl.type, "if_packets", sizeof (vl.type));
3391 plugin_dispatch_values (&vl);
3393 /* Values (not) dispatched and (not) send */
3394 sstrncpy (vl.type, "total_values", sizeof (vl.type));
3395 vl.values_len = 1;
3397 vl.values[0].derive = (derive_t) copy_values_dispatched;
3398 sstrncpy (vl.type_instance, "dispatch-accepted",
3399 sizeof (vl.type_instance));
3400 plugin_dispatch_values (&vl);
3402 vl.values[0].derive = (derive_t) copy_values_not_dispatched;
3403 sstrncpy (vl.type_instance, "dispatch-rejected",
3404 sizeof (vl.type_instance));
3405 plugin_dispatch_values (&vl);
3407 vl.values[0].derive = (derive_t) copy_values_sent;
3408 sstrncpy (vl.type_instance, "send-accepted",
3409 sizeof (vl.type_instance));
3410 plugin_dispatch_values (&vl);
3412 vl.values[0].derive = (derive_t) copy_values_not_sent;
3413 sstrncpy (vl.type_instance, "send-rejected",
3414 sizeof (vl.type_instance));
3415 plugin_dispatch_values (&vl);
3417 /* Receive queue length */
3418 vl.values[0].gauge = (gauge_t) copy_receive_list_length;
3419 sstrncpy (vl.type, "queue_length", sizeof (vl.type));
3420 vl.type_instance[0] = 0;
3421 plugin_dispatch_values (&vl);
3423 return (0);
3424 } /* }}} int network_stats_read */
3426 static int network_init (void)
3427 {
3428 static _Bool have_init = 0;
3430 /* Check if we were already initialized. If so, just return - there's
3431 * nothing more to do (for now, that is). */
3432 if (have_init)
3433 return (0);
3434 have_init = 1;
3436 #if HAVE_LIBGCRYPT
3437 network_init_gcrypt ();
3438 #endif
3440 if (network_config_stats)
3441 plugin_register_read ("network", network_stats_read);
3443 plugin_register_shutdown ("network", network_shutdown);
3445 send_buffer = malloc (network_config_packet_size);
3446 if (send_buffer == NULL)
3447 {
3448 ERROR ("network plugin: malloc failed.");
3449 return (-1);
3450 }
3451 network_init_buffer ();
3453 /* setup socket(s) and so on */
3454 if (sending_sockets != NULL)
3455 {
3456 plugin_register_write ("network", network_write,
3457 /* user_data = */ NULL);
3458 plugin_register_notification ("network", network_notification,
3459 /* user_data = */ NULL);
3460 }
3462 /* If no threads need to be started, return here. */
3463 if ((listen_sockets_num == 0)
3464 || ((dispatch_thread_running != 0)
3465 && (receive_thread_running != 0)))
3466 return (0);
3468 if (dispatch_thread_running == 0)
3469 {
3470 int status;
3471 status = plugin_thread_create (&dispatch_thread_id,
3472 NULL /* no attributes */,
3473 dispatch_thread,
3474 NULL /* no argument */);
3475 if (status != 0)
3476 {
3477 char errbuf[1024];
3478 ERROR ("network: pthread_create failed: %s",
3479 sstrerror (errno, errbuf,
3480 sizeof (errbuf)));
3481 }
3482 else
3483 {
3484 dispatch_thread_running = 1;
3485 }
3486 }
3488 if (receive_thread_running == 0)
3489 {
3490 int status;
3491 status = plugin_thread_create (&receive_thread_id,
3492 NULL /* no attributes */,
3493 receive_thread,
3494 NULL /* no argument */);
3495 if (status != 0)
3496 {
3497 char errbuf[1024];
3498 ERROR ("network: pthread_create failed: %s",
3499 sstrerror (errno, errbuf,
3500 sizeof (errbuf)));
3501 }
3502 else
3503 {
3504 receive_thread_running = 1;
3505 }
3506 }
3508 return (0);
3509 } /* int network_init */
3511 /*
3512 * The flush option of the network plugin cannot flush individual identifiers.
3513 * All the values are added to a buffer and sent when the buffer is full, the
3514 * requested value may or may not be in there, it's not worth finding out. We
3515 * just send the buffer if `flush' is called - if the requested value was in
3516 * there, good. If not, well, then there is nothing to flush.. -octo
3517 */
3518 static int network_flush (cdtime_t timeout,
3519 __attribute__((unused)) const char *identifier,
3520 __attribute__((unused)) user_data_t *user_data)
3521 {
3522 pthread_mutex_lock (&send_buffer_lock);
3524 if (send_buffer_fill > 0)
3525 {
3526 if (timeout > 0)
3527 {
3528 cdtime_t now = cdtime ();
3529 if ((send_buffer_last_update + timeout) > now)
3530 {
3531 pthread_mutex_unlock (&send_buffer_lock);
3532 return (0);
3533 }
3534 }
3535 flush_buffer ();
3536 }
3537 pthread_mutex_unlock (&send_buffer_lock);
3539 return (0);
3540 } /* int network_flush */
3542 void module_register (void)
3543 {
3544 plugin_register_complex_config ("network", network_config);
3545 plugin_register_init ("network", network_init);
3546 plugin_register_flush ("network", network_flush,
3547 /* user_data = */ NULL);
3548 } /* void module_register */
3550 /* vim: set fdm=marker : */