1 /**
2 * collectd - src/network.c
3 * Copyright (C) 2005-2010 Florian octo Forster
4 * Copyright (C) 2009 Aman Gupta
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation; only version 2.1 of the License is
9 * applicable.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Florian octo Forster <octo at verplant.org>
22 * Aman Gupta <aman at tmm1.net>
23 **/
25 #define _BSD_SOURCE /* For struct ip_mreq */
27 #include "collectd.h"
28 #include "plugin.h"
29 #include "common.h"
30 #include "configfile.h"
31 #include "utils_fbhash.h"
32 #include "utils_avltree.h"
33 #include "utils_cache.h"
34 #include "utils_complain.h"
36 #include "network.h"
38 #if HAVE_PTHREAD_H
39 # include <pthread.h>
40 #endif
41 #if HAVE_SYS_SOCKET_H
42 # include <sys/socket.h>
43 #endif
44 #if HAVE_NETDB_H
45 # include <netdb.h>
46 #endif
47 #if HAVE_NETINET_IN_H
48 # include <netinet/in.h>
49 #endif
50 #if HAVE_ARPA_INET_H
51 # include <arpa/inet.h>
52 #endif
53 #if HAVE_POLL_H
54 # include <poll.h>
55 #endif
56 #if HAVE_NET_IF_H
57 # include <net/if.h>
58 #endif
60 #if HAVE_LIBGCRYPT
61 # include <gcrypt.h>
62 GCRY_THREAD_OPTION_PTHREAD_IMPL;
63 #endif
65 #ifndef IPV6_ADD_MEMBERSHIP
66 # ifdef IPV6_JOIN_GROUP
67 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
68 # else
69 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
70 # endif
71 #endif /* !IP_ADD_MEMBERSHIP */
73 /*
74 * Maximum size required for encryption / signing:
75 *
76 * 42 bytes for the encryption header
77 * + 64 bytes for the username
78 * -----------
79 * = 106 bytes
80 */
81 #define BUFF_SIG_SIZE 106
83 /*
84 * Private data types
85 */
86 #define SECURITY_LEVEL_NONE 0
87 #if HAVE_LIBGCRYPT
88 # define SECURITY_LEVEL_SIGN 1
89 # define SECURITY_LEVEL_ENCRYPT 2
90 #endif
91 struct sockent_client
92 {
93 int fd;
94 struct sockaddr_storage *addr;
95 socklen_t addrlen;
96 #if HAVE_LIBGCRYPT
97 int security_level;
98 char *username;
99 char *password;
100 gcry_cipher_hd_t cypher;
101 unsigned char password_hash[32];
102 #endif
103 };
105 struct sockent_server
106 {
107 int *fd;
108 size_t fd_num;
109 #if HAVE_LIBGCRYPT
110 int security_level;
111 char *auth_file;
112 fbhash_t *userdb;
113 gcry_cipher_hd_t cypher;
114 #endif
115 };
117 typedef struct sockent
118 {
119 #define SOCKENT_TYPE_CLIENT 1
120 #define SOCKENT_TYPE_SERVER 2
121 int type;
123 char *node;
124 char *service;
125 int interface;
127 union
128 {
129 struct sockent_client client;
130 struct sockent_server server;
131 } data;
133 struct sockent *next;
134 } sockent_t;
136 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
137 * 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
138 * +-------+-----------------------+-------------------------------+
139 * ! Ver. ! ! Length !
140 * +-------+-----------------------+-------------------------------+
141 */
142 struct part_header_s
143 {
144 uint16_t type;
145 uint16_t length;
146 };
147 typedef struct part_header_s part_header_t;
149 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
150 * 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
151 * +-------------------------------+-------------------------------+
152 * ! Type ! Length !
153 * +-------------------------------+-------------------------------+
154 * : (Length - 4) Bytes :
155 * +---------------------------------------------------------------+
156 */
157 struct part_string_s
158 {
159 part_header_t *head;
160 char *value;
161 };
162 typedef struct part_string_s part_string_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 == 2 || 4 || 8) Bytes :
170 * +---------------------------------------------------------------+
171 */
172 struct part_number_s
173 {
174 part_header_t *head;
175 uint64_t *value;
176 };
177 typedef struct part_number_s part_number_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 * ! Num of values ! Type0 ! Type1 !
185 * +-------------------------------+---------------+---------------+
186 * ! Value0 !
187 * ! !
188 * +---------------------------------------------------------------+
189 * ! Value1 !
190 * ! !
191 * +---------------------------------------------------------------+
192 */
193 struct part_values_s
194 {
195 part_header_t *head;
196 uint16_t *num_values;
197 uint8_t *values_types;
198 value_t *values;
199 };
200 typedef struct part_values_s part_values_t;
202 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
203 * 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
204 * +-------------------------------+-------------------------------+
205 * ! Type ! Length !
206 * +-------------------------------+-------------------------------+
207 * ! Hash (Bits 0 - 31) !
208 * : : :
209 * ! Hash (Bits 224 - 255) !
210 * +---------------------------------------------------------------+
211 */
212 /* Minimum size */
213 #define PART_SIGNATURE_SHA256_SIZE 36
214 struct part_signature_sha256_s
215 {
216 part_header_t head;
217 unsigned char hash[32];
218 char *username;
219 };
220 typedef struct part_signature_sha256_s part_signature_sha256_t;
222 /* 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
223 * 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
224 * +-------------------------------+-------------------------------+
225 * ! Type ! Length !
226 * +-------------------------------+-------------------------------+
227 * ! Original length ! Padding (0 - 15 bytes) !
228 * +-------------------------------+-------------------------------+
229 * ! Hash (Bits 0 - 31) !
230 * : : :
231 * ! Hash (Bits 128 - 159) !
232 * +---------------------------------------------------------------+
233 */
234 /* Minimum size */
235 #define PART_ENCRYPTION_AES256_SIZE 42
236 struct part_encryption_aes256_s
237 {
238 part_header_t head;
239 uint16_t username_length;
240 char *username;
241 unsigned char iv[16];
242 /* <encrypted> */
243 unsigned char hash[20];
244 /* <payload /> */
245 /* </encrypted> */
246 };
247 typedef struct part_encryption_aes256_s part_encryption_aes256_t;
249 struct receive_list_entry_s
250 {
251 char *data;
252 int data_len;
253 int fd;
254 struct receive_list_entry_s *next;
255 };
256 typedef struct receive_list_entry_s receive_list_entry_t;
258 /*
259 * Private variables
260 */
261 static int network_config_ttl = 0;
262 /* Ethernet - (IPv6 + UDP) = 1500 - (40 + 8) = 1452 */
263 static size_t network_config_packet_size = 1452;
264 static int network_config_forward = 0;
265 static int network_config_stats = 0;
267 static sockent_t *sending_sockets = NULL;
269 static receive_list_entry_t *receive_list_head = NULL;
270 static receive_list_entry_t *receive_list_tail = NULL;
271 static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
272 static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
273 static uint64_t receive_list_length = 0;
275 static sockent_t *listen_sockets = NULL;
276 static struct pollfd *listen_sockets_pollfd = NULL;
277 static size_t listen_sockets_num = 0;
279 /* The receive and dispatch threads will run as long as `listen_loop' is set to
280 * zero. */
281 static int listen_loop = 0;
282 static int receive_thread_running = 0;
283 static pthread_t receive_thread_id;
284 static int dispatch_thread_running = 0;
285 static pthread_t dispatch_thread_id;
287 /* Buffer in which to-be-sent network packets are constructed. */
288 static char *send_buffer;
289 static char *send_buffer_ptr;
290 static int send_buffer_fill;
291 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
292 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
294 /* XXX: These counters are incremented from one place only. The spot in which
295 * the values are incremented is either only reachable by one thread (the
296 * dispatch thread, for example) or locked by some lock (send_buffer_lock for
297 * example). Only if neither is true, the stats_lock is acquired. The counters
298 * are always read without holding a lock in the hope that writing 8 bytes to
299 * memory is an atomic operation. */
300 static derive_t stats_octets_rx = 0;
301 static derive_t stats_octets_tx = 0;
302 static derive_t stats_packets_rx = 0;
303 static derive_t stats_packets_tx = 0;
304 static derive_t stats_values_dispatched = 0;
305 static derive_t stats_values_not_dispatched = 0;
306 static derive_t stats_values_sent = 0;
307 static derive_t stats_values_not_sent = 0;
308 static pthread_mutex_t stats_lock = PTHREAD_MUTEX_INITIALIZER;
310 /*
311 * Private functions
312 */
313 static _Bool check_receive_okay (const value_list_t *vl) /* {{{ */
314 {
315 uint64_t time_sent = 0;
316 int status;
318 status = uc_meta_data_get_unsigned_int (vl,
319 "network:time_sent", &time_sent);
321 /* This is a value we already sent. Don't allow it to be received again in
322 * order to avoid looping. */
323 if ((status == 0) && (time_sent >= ((uint64_t) vl->time)))
324 return (0);
326 return (1);
327 } /* }}} _Bool check_receive_okay */
329 static _Bool check_send_okay (const value_list_t *vl) /* {{{ */
330 {
331 _Bool received = 0;
332 int status;
334 if (network_config_forward != 0)
335 return (1);
337 if (vl->meta == NULL)
338 return (1);
340 status = meta_data_get_boolean (vl->meta, "network:received", &received);
341 if (status == -ENOENT)
342 return (1);
343 else if (status != 0)
344 {
345 ERROR ("network plugin: check_send_okay: meta_data_get_boolean failed "
346 "with status %i.", status);
347 return (1);
348 }
350 /* By default, only *send* value lists that were not *received* by the
351 * network plugin. */
352 return (!received);
353 } /* }}} _Bool check_send_okay */
355 static int network_dispatch_values (value_list_t *vl, /* {{{ */
356 const char *username)
357 {
358 int status;
360 if ((vl->time <= 0)
361 || (strlen (vl->host) <= 0)
362 || (strlen (vl->plugin) <= 0)
363 || (strlen (vl->type) <= 0))
364 return (-EINVAL);
366 if (!check_receive_okay (vl))
367 {
368 #if COLLECT_DEBUG
369 char name[6*DATA_MAX_NAME_LEN];
370 FORMAT_VL (name, sizeof (name), vl);
371 name[sizeof (name) - 1] = 0;
372 DEBUG ("network plugin: network_dispatch_values: "
373 "NOT dispatching %s.", name);
374 #endif
375 stats_values_not_dispatched++;
376 return (0);
377 }
379 assert (vl->meta == NULL);
381 vl->meta = meta_data_create ();
382 if (vl->meta == NULL)
383 {
384 ERROR ("network plugin: meta_data_create failed.");
385 return (-ENOMEM);
386 }
388 status = meta_data_add_boolean (vl->meta, "network:received", 1);
389 if (status != 0)
390 {
391 ERROR ("network plugin: meta_data_add_boolean failed.");
392 meta_data_destroy (vl->meta);
393 vl->meta = NULL;
394 return (status);
395 }
397 if (username != NULL)
398 {
399 status = meta_data_add_string (vl->meta, "network:username", username);
400 if (status != 0)
401 {
402 ERROR ("network plugin: meta_data_add_string failed.");
403 meta_data_destroy (vl->meta);
404 vl->meta = NULL;
405 return (status);
406 }
407 }
409 plugin_dispatch_values_secure (vl);
410 stats_values_dispatched++;
412 meta_data_destroy (vl->meta);
413 vl->meta = NULL;
415 return (0);
416 } /* }}} int network_dispatch_values */
418 #if HAVE_LIBGCRYPT
419 static gcry_cipher_hd_t network_get_aes256_cypher (sockent_t *se, /* {{{ */
420 const void *iv, size_t iv_size, const char *username)
421 {
422 gcry_error_t err;
423 gcry_cipher_hd_t *cyper_ptr;
424 unsigned char password_hash[32];
426 if (se->type == SOCKENT_TYPE_CLIENT)
427 {
428 cyper_ptr = &se->data.client.cypher;
429 memcpy (password_hash, se->data.client.password_hash,
430 sizeof (password_hash));
431 }
432 else
433 {
434 char *secret;
436 cyper_ptr = &se->data.server.cypher;
438 if (username == NULL)
439 return (NULL);
441 secret = fbh_get (se->data.server.userdb, username);
442 if (secret == NULL)
443 return (NULL);
445 gcry_md_hash_buffer (GCRY_MD_SHA256,
446 password_hash,
447 secret, strlen (secret));
449 sfree (secret);
450 }
452 if (*cyper_ptr == NULL)
453 {
454 err = gcry_cipher_open (cyper_ptr,
455 GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_OFB, /* flags = */ 0);
456 if (err != 0)
457 {
458 ERROR ("network plugin: gcry_cipher_open returned: %s",
459 gcry_strerror (err));
460 *cyper_ptr = NULL;
461 return (NULL);
462 }
463 }
464 else
465 {
466 gcry_cipher_reset (*cyper_ptr);
467 }
468 assert (*cyper_ptr != NULL);
470 err = gcry_cipher_setkey (*cyper_ptr,
471 password_hash, sizeof (password_hash));
472 if (err != 0)
473 {
474 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
475 gcry_strerror (err));
476 gcry_cipher_close (*cyper_ptr);
477 *cyper_ptr = NULL;
478 return (NULL);
479 }
481 err = gcry_cipher_setiv (*cyper_ptr, iv, iv_size);
482 if (err != 0)
483 {
484 ERROR ("network plugin: gcry_cipher_setkey returned: %s",
485 gcry_strerror (err));
486 gcry_cipher_close (*cyper_ptr);
487 *cyper_ptr = NULL;
488 return (NULL);
489 }
491 return (*cyper_ptr);
492 } /* }}} int network_get_aes256_cypher */
493 #endif /* HAVE_LIBGCRYPT */
495 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
496 const data_set_t *ds, const value_list_t *vl)
497 {
498 char *packet_ptr;
499 int packet_len;
500 int num_values;
502 part_header_t pkg_ph;
503 uint16_t pkg_num_values;
504 uint8_t *pkg_values_types;
505 value_t *pkg_values;
507 int offset;
508 int i;
510 num_values = vl->values_len;
511 packet_len = sizeof (part_header_t) + sizeof (uint16_t)
512 + (num_values * sizeof (uint8_t))
513 + (num_values * sizeof (value_t));
515 if (*ret_buffer_len < packet_len)
516 return (-1);
518 pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
519 if (pkg_values_types == NULL)
520 {
521 ERROR ("network plugin: write_part_values: malloc failed.");
522 return (-1);
523 }
525 pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
526 if (pkg_values == NULL)
527 {
528 free (pkg_values_types);
529 ERROR ("network plugin: write_part_values: malloc failed.");
530 return (-1);
531 }
533 pkg_ph.type = htons (TYPE_VALUES);
534 pkg_ph.length = htons (packet_len);
536 pkg_num_values = htons ((uint16_t) vl->values_len);
538 for (i = 0; i < num_values; i++)
539 {
540 pkg_values_types[i] = (uint8_t) ds->ds[i].type;
541 switch (ds->ds[i].type)
542 {
543 case DS_TYPE_COUNTER:
544 pkg_values[i].counter = htonll (vl->values[i].counter);
545 break;
547 case DS_TYPE_GAUGE:
548 pkg_values[i].gauge = htond (vl->values[i].gauge);
549 break;
551 case DS_TYPE_DERIVE:
552 pkg_values[i].derive = htonll (vl->values[i].derive);
553 break;
555 case DS_TYPE_ABSOLUTE:
556 pkg_values[i].absolute = htonll (vl->values[i].absolute);
557 break;
559 default:
560 free (pkg_values_types);
561 free (pkg_values);
562 ERROR ("network plugin: write_part_values: "
563 "Unknown data source type: %i",
564 ds->ds[i].type);
565 return (-1);
566 } /* switch (ds->ds[i].type) */
567 } /* for (num_values) */
569 /*
570 * Use `memcpy' to write everything to the buffer, because the pointer
571 * may be unaligned and some architectures, such as SPARC, can't handle
572 * that.
573 */
574 packet_ptr = *ret_buffer;
575 offset = 0;
576 memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
577 offset += sizeof (pkg_ph);
578 memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
579 offset += sizeof (pkg_num_values);
580 memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
581 offset += num_values * sizeof (uint8_t);
582 memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
583 offset += num_values * sizeof (value_t);
585 assert (offset == packet_len);
587 *ret_buffer = packet_ptr + packet_len;
588 *ret_buffer_len -= packet_len;
590 free (pkg_values_types);
591 free (pkg_values);
593 return (0);
594 } /* int write_part_values */
596 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
597 int type, uint64_t value)
598 {
599 char *packet_ptr;
600 int packet_len;
602 part_header_t pkg_head;
603 uint64_t pkg_value;
605 int offset;
607 packet_len = sizeof (pkg_head) + sizeof (pkg_value);
609 if (*ret_buffer_len < packet_len)
610 return (-1);
612 pkg_head.type = htons (type);
613 pkg_head.length = htons (packet_len);
614 pkg_value = htonll (value);
616 packet_ptr = *ret_buffer;
617 offset = 0;
618 memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
619 offset += sizeof (pkg_head);
620 memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
621 offset += sizeof (pkg_value);
623 assert (offset == packet_len);
625 *ret_buffer = packet_ptr + packet_len;
626 *ret_buffer_len -= packet_len;
628 return (0);
629 } /* int write_part_number */
631 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
632 int type, const char *str, int str_len)
633 {
634 char *buffer;
635 int buffer_len;
637 uint16_t pkg_type;
638 uint16_t pkg_length;
640 int offset;
642 buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
643 if (*ret_buffer_len < buffer_len)
644 return (-1);
646 pkg_type = htons (type);
647 pkg_length = htons (buffer_len);
649 buffer = *ret_buffer;
650 offset = 0;
651 memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
652 offset += sizeof (pkg_type);
653 memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
654 offset += sizeof (pkg_length);
655 memcpy (buffer + offset, str, str_len);
656 offset += str_len;
657 memset (buffer + offset, '\0', 1);
658 offset += 1;
660 assert (offset == buffer_len);
662 *ret_buffer = buffer + buffer_len;
663 *ret_buffer_len -= buffer_len;
665 return (0);
666 } /* int write_part_string */
668 static int parse_part_values (void **ret_buffer, size_t *ret_buffer_len,
669 value_t **ret_values, int *ret_num_values)
670 {
671 char *buffer = *ret_buffer;
672 size_t buffer_len = *ret_buffer_len;
674 uint16_t tmp16;
675 size_t exp_size;
676 int i;
678 uint16_t pkg_length;
679 uint16_t pkg_type;
680 uint16_t pkg_numval;
682 uint8_t *pkg_types;
683 value_t *pkg_values;
685 if (buffer_len < 15)
686 {
687 NOTICE ("network plugin: packet is too short: "
688 "buffer_len = %zu", buffer_len);
689 return (-1);
690 }
692 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
693 buffer += sizeof (tmp16);
694 pkg_type = ntohs (tmp16);
696 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
697 buffer += sizeof (tmp16);
698 pkg_length = ntohs (tmp16);
700 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
701 buffer += sizeof (tmp16);
702 pkg_numval = ntohs (tmp16);
704 assert (pkg_type == TYPE_VALUES);
706 exp_size = 3 * sizeof (uint16_t)
707 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
708 if ((buffer_len < 0) || (buffer_len < exp_size))
709 {
710 WARNING ("network plugin: parse_part_values: "
711 "Packet too short: "
712 "Chunk of size %zu expected, "
713 "but buffer has only %zu bytes left.",
714 exp_size, buffer_len);
715 return (-1);
716 }
718 if (pkg_length != exp_size)
719 {
720 WARNING ("network plugin: parse_part_values: "
721 "Length and number of values "
722 "in the packet don't match.");
723 return (-1);
724 }
726 pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
727 pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
728 if ((pkg_types == NULL) || (pkg_values == NULL))
729 {
730 sfree (pkg_types);
731 sfree (pkg_values);
732 ERROR ("network plugin: parse_part_values: malloc failed.");
733 return (-1);
734 }
736 memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
737 buffer += pkg_numval * sizeof (uint8_t);
738 memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
739 buffer += pkg_numval * sizeof (value_t);
741 for (i = 0; i < pkg_numval; i++)
742 {
743 switch (pkg_types[i])
744 {
745 case DS_TYPE_COUNTER:
746 pkg_values[i].counter = (counter_t) ntohll (pkg_values[i].counter);
747 break;
749 case DS_TYPE_GAUGE:
750 pkg_values[i].gauge = (gauge_t) ntohd (pkg_values[i].gauge);
751 break;
753 case DS_TYPE_DERIVE:
754 pkg_values[i].derive = (derive_t) ntohll (pkg_values[i].derive);
755 break;
757 case DS_TYPE_ABSOLUTE:
758 pkg_values[i].absolute = (absolute_t) ntohll (pkg_values[i].absolute);
759 break;
761 default:
762 NOTICE ("network plugin: parse_part_values: "
763 "Don't know how to handle data source type %"PRIu8,
764 pkg_types[i]);
765 sfree (pkg_types);
766 sfree (pkg_values);
767 return (-1);
768 } /* switch (pkg_types[i]) */
769 }
771 *ret_buffer = buffer;
772 *ret_buffer_len = buffer_len - pkg_length;
773 *ret_num_values = pkg_numval;
774 *ret_values = pkg_values;
776 sfree (pkg_types);
778 return (0);
779 } /* int parse_part_values */
781 static int parse_part_number (void **ret_buffer, size_t *ret_buffer_len,
782 uint64_t *value)
783 {
784 char *buffer = *ret_buffer;
785 size_t buffer_len = *ret_buffer_len;
787 uint16_t tmp16;
788 uint64_t tmp64;
789 size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
791 uint16_t pkg_length;
793 if ((buffer_len < 0) || ((size_t) buffer_len < exp_size))
794 {
795 WARNING ("network plugin: parse_part_number: "
796 "Packet too short: "
797 "Chunk of size %zu expected, "
798 "but buffer has only %zu bytes left.",
799 exp_size, buffer_len);
800 return (-1);
801 }
803 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
804 buffer += sizeof (tmp16);
805 /* pkg_type = ntohs (tmp16); */
807 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
808 buffer += sizeof (tmp16);
809 pkg_length = ntohs (tmp16);
811 memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
812 buffer += sizeof (tmp64);
813 *value = ntohll (tmp64);
815 *ret_buffer = buffer;
816 *ret_buffer_len = buffer_len - pkg_length;
818 return (0);
819 } /* int parse_part_number */
821 static int parse_part_string (void **ret_buffer, size_t *ret_buffer_len,
822 char *output, int output_len)
823 {
824 char *buffer = *ret_buffer;
825 size_t buffer_len = *ret_buffer_len;
827 uint16_t tmp16;
828 size_t header_size = 2 * sizeof (uint16_t);
830 uint16_t pkg_length;
832 if ((buffer_len < 0) || (buffer_len < header_size))
833 {
834 WARNING ("network plugin: parse_part_string: "
835 "Packet too short: "
836 "Chunk of at least size %zu expected, "
837 "but buffer has only %zu bytes left.",
838 header_size, buffer_len);
839 return (-1);
840 }
842 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
843 buffer += sizeof (tmp16);
844 /* pkg_type = ntohs (tmp16); */
846 memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
847 buffer += sizeof (tmp16);
848 pkg_length = ntohs (tmp16);
850 /* Check that packet fits in the input buffer */
851 if (pkg_length > buffer_len)
852 {
853 WARNING ("network plugin: parse_part_string: "
854 "Packet too big: "
855 "Chunk of size %"PRIu16" received, "
856 "but buffer has only %zu bytes left.",
857 pkg_length, buffer_len);
858 return (-1);
859 }
861 /* Check that pkg_length is in the valid range */
862 if (pkg_length <= header_size)
863 {
864 WARNING ("network plugin: parse_part_string: "
865 "Packet too short: "
866 "Header claims this packet is only %hu "
867 "bytes long.", pkg_length);
868 return (-1);
869 }
871 /* Check that the package data fits into the output buffer.
872 * The previous if-statement ensures that:
873 * `pkg_length > header_size' */
874 if ((output_len < 0)
875 || ((size_t) output_len < ((size_t) pkg_length - header_size)))
876 {
877 WARNING ("network plugin: parse_part_string: "
878 "Output buffer too small.");
879 return (-1);
880 }
882 /* All sanity checks successfull, let's copy the data over */
883 output_len = pkg_length - header_size;
884 memcpy ((void *) output, (void *) buffer, output_len);
885 buffer += output_len;
887 /* For some very weird reason '\0' doesn't do the trick on SPARC in
888 * this statement. */
889 if (output[output_len - 1] != 0)
890 {
891 WARNING ("network plugin: parse_part_string: "
892 "Received string does not end "
893 "with a NULL-byte.");
894 return (-1);
895 }
897 *ret_buffer = buffer;
898 *ret_buffer_len = buffer_len - pkg_length;
900 return (0);
901 } /* int parse_part_string */
903 /* Forward declaration: parse_part_sign_sha256 and parse_part_encr_aes256 call
904 * parse_packet and vice versa. */
905 #define PP_SIGNED 0x01
906 #define PP_ENCRYPTED 0x02
907 static int parse_packet (sockent_t *se,
908 void *buffer, size_t buffer_size, int flags,
909 const char *username);
911 #define BUFFER_READ(p,s) do { \
912 memcpy ((p), buffer + buffer_offset, (s)); \
913 buffer_offset += (s); \
914 } while (0)
916 #if HAVE_LIBGCRYPT
917 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
918 void **ret_buffer, size_t *ret_buffer_len, int flags)
919 {
920 static c_complain_t complain_no_users = C_COMPLAIN_INIT_STATIC;
922 char *buffer;
923 size_t buffer_len;
924 size_t buffer_offset;
926 size_t username_len;
927 char *secret;
929 part_signature_sha256_t pss;
930 uint16_t pss_head_length;
931 char hash[sizeof (pss.hash)];
933 gcry_md_hd_t hd;
934 gcry_error_t err;
935 unsigned char *hash_ptr;
937 buffer = *ret_buffer;
938 buffer_len = *ret_buffer_len;
939 buffer_offset = 0;
941 if (se->data.server.userdb == NULL)
942 {
943 c_complain (LOG_NOTICE, &complain_no_users,
944 "network plugin: Received signed network packet but can't verify it "
945 "because no user DB has been configured. Will accept it.");
946 return (0);
947 }
949 /* Check if the buffer has enough data for this structure. */
950 if (buffer_len <= PART_SIGNATURE_SHA256_SIZE)
951 return (-ENOMEM);
953 /* Read type and length header */
954 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
955 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
956 pss_head_length = ntohs (pss.head.length);
958 /* Check if the `pss_head_length' is within bounds. */
959 if ((pss_head_length <= PART_SIGNATURE_SHA256_SIZE)
960 || (pss_head_length > buffer_len))
961 {
962 ERROR ("network plugin: HMAC-SHA-256 with invalid length received.");
963 return (-1);
964 }
966 /* Copy the hash. */
967 BUFFER_READ (pss.hash, sizeof (pss.hash));
969 /* Calculate username length (without null byte) and allocate memory */
970 username_len = pss_head_length - PART_SIGNATURE_SHA256_SIZE;
971 pss.username = malloc (username_len + 1);
972 if (pss.username == NULL)
973 return (-ENOMEM);
975 /* Read the username */
976 BUFFER_READ (pss.username, username_len);
977 pss.username[username_len] = 0;
979 assert (buffer_offset == pss_head_length);
981 /* Query the password */
982 secret = fbh_get (se->data.server.userdb, pss.username);
983 if (secret == NULL)
984 {
985 ERROR ("network plugin: Unknown user: %s", pss.username);
986 sfree (pss.username);
987 return (-ENOENT);
988 }
990 /* Create a hash device and check the HMAC */
991 hd = NULL;
992 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
993 if (err != 0)
994 {
995 ERROR ("network plugin: Creating HMAC-SHA-256 object failed: %s",
996 gcry_strerror (err));
997 sfree (secret);
998 sfree (pss.username);
999 return (-1);
1000 }
1002 err = gcry_md_setkey (hd, secret, strlen (secret));
1003 if (err != 0)
1004 {
1005 ERROR ("network plugin: gcry_md_setkey failed: %s", gcry_strerror (err));
1006 gcry_md_close (hd);
1007 sfree (secret);
1008 sfree (pss.username);
1009 return (-1);
1010 }
1012 gcry_md_write (hd,
1013 buffer + PART_SIGNATURE_SHA256_SIZE,
1014 buffer_len - PART_SIGNATURE_SHA256_SIZE);
1015 hash_ptr = gcry_md_read (hd, GCRY_MD_SHA256);
1016 if (hash_ptr == NULL)
1017 {
1018 ERROR ("network plugin: gcry_md_read failed.");
1019 gcry_md_close (hd);
1020 sfree (secret);
1021 sfree (pss.username);
1022 return (-1);
1023 }
1024 memcpy (hash, hash_ptr, sizeof (hash));
1026 /* Clean up */
1027 gcry_md_close (hd);
1028 hd = NULL;
1030 if (memcmp (pss.hash, hash, sizeof (pss.hash)) != 0)
1031 {
1032 WARNING ("network plugin: Verifying HMAC-SHA-256 signature failed: "
1033 "Hash mismatch.");
1034 }
1035 else
1036 {
1037 parse_packet (se, buffer + buffer_offset, buffer_len - buffer_offset,
1038 flags | PP_SIGNED, pss.username);
1039 }
1041 sfree (secret);
1042 sfree (pss.username);
1044 *ret_buffer = buffer + buffer_len;
1045 *ret_buffer_len = 0;
1047 return (0);
1048 } /* }}} int parse_part_sign_sha256 */
1049 /* #endif HAVE_LIBGCRYPT */
1051 #else /* if !HAVE_LIBGCRYPT */
1052 static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
1053 void **ret_buffer, size_t *ret_buffer_size, int flags)
1054 {
1055 static int warning_has_been_printed = 0;
1057 char *buffer;
1058 size_t buffer_size;
1059 size_t buffer_offset;
1060 uint16_t part_len;
1062 part_signature_sha256_t pss;
1064 buffer = *ret_buffer;
1065 buffer_size = *ret_buffer_size;
1066 buffer_offset = 0;
1068 if (buffer_size <= PART_SIGNATURE_SHA256_SIZE)
1069 return (-ENOMEM);
1071 BUFFER_READ (&pss.head.type, sizeof (pss.head.type));
1072 BUFFER_READ (&pss.head.length, sizeof (pss.head.length));
1073 part_len = ntohs (pss.head.length);
1075 if ((part_len <= PART_SIGNATURE_SHA256_SIZE)
1076 || (part_len > buffer_size))
1077 return (-EINVAL);
1079 if (warning_has_been_printed == 0)
1080 {
1081 WARNING ("network plugin: Received signed packet, but the network "
1082 "plugin was not linked with libgcrypt, so I cannot "
1083 "verify the signature. The packet will be accepted.");
1084 warning_has_been_printed = 1;
1085 }
1087 parse_packet (se, buffer + part_len, buffer_size - part_len, flags,
1088 /* username = */ NULL);
1090 *ret_buffer = buffer + buffer_size;
1091 *ret_buffer_size = 0;
1093 return (0);
1094 } /* }}} int parse_part_sign_sha256 */
1095 #endif /* !HAVE_LIBGCRYPT */
1097 #if HAVE_LIBGCRYPT
1098 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1099 void **ret_buffer, size_t *ret_buffer_len,
1100 int flags)
1101 {
1102 char *buffer = *ret_buffer;
1103 size_t buffer_len = *ret_buffer_len;
1104 size_t payload_len;
1105 size_t part_size;
1106 size_t buffer_offset;
1107 uint16_t username_len;
1108 part_encryption_aes256_t pea;
1109 unsigned char hash[sizeof (pea.hash)];
1111 gcry_cipher_hd_t cypher;
1112 gcry_error_t err;
1114 /* Make sure at least the header if available. */
1115 if (buffer_len <= PART_ENCRYPTION_AES256_SIZE)
1116 {
1117 NOTICE ("network plugin: parse_part_encr_aes256: "
1118 "Discarding short packet.");
1119 return (-1);
1120 }
1122 buffer_offset = 0;
1124 /* Copy the unencrypted information into `pea'. */
1125 BUFFER_READ (&pea.head.type, sizeof (pea.head.type));
1126 BUFFER_READ (&pea.head.length, sizeof (pea.head.length));
1128 /* Check the `part size'. */
1129 part_size = ntohs (pea.head.length);
1130 if ((part_size <= PART_ENCRYPTION_AES256_SIZE)
1131 || (part_size > buffer_len))
1132 {
1133 NOTICE ("network plugin: parse_part_encr_aes256: "
1134 "Discarding part with invalid size.");
1135 return (-1);
1136 }
1138 /* Read the username */
1139 BUFFER_READ (&username_len, sizeof (username_len));
1140 username_len = ntohs (username_len);
1142 if ((username_len <= 0)
1143 || (username_len > (part_size - (PART_ENCRYPTION_AES256_SIZE + 1))))
1144 {
1145 NOTICE ("network plugin: parse_part_encr_aes256: "
1146 "Discarding part with invalid username length.");
1147 return (-1);
1148 }
1150 assert (username_len > 0);
1151 pea.username = malloc (username_len + 1);
1152 if (pea.username == NULL)
1153 return (-ENOMEM);
1154 BUFFER_READ (pea.username, username_len);
1155 pea.username[username_len] = 0;
1157 /* Last but not least, the initialization vector */
1158 BUFFER_READ (pea.iv, sizeof (pea.iv));
1160 /* Make sure we are at the right position */
1161 assert (buffer_offset == (username_len +
1162 PART_ENCRYPTION_AES256_SIZE - sizeof (pea.hash)));
1164 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
1165 pea.username);
1166 if (cypher == NULL)
1167 {
1168 sfree (pea.username);
1169 return (-1);
1170 }
1172 payload_len = part_size - (PART_ENCRYPTION_AES256_SIZE + username_len);
1173 assert (payload_len > 0);
1175 /* Decrypt the packet in-place */
1176 err = gcry_cipher_decrypt (cypher,
1177 buffer + buffer_offset,
1178 part_size - buffer_offset,
1179 /* in = */ NULL, /* in len = */ 0);
1180 if (err != 0)
1181 {
1182 sfree (pea.username);
1183 ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
1184 gcry_strerror (err));
1185 return (-1);
1186 }
1188 /* Read the hash */
1189 BUFFER_READ (pea.hash, sizeof (pea.hash));
1191 /* Make sure we're at the right position - again */
1192 assert (buffer_offset == (username_len + PART_ENCRYPTION_AES256_SIZE));
1193 assert (buffer_offset == (part_size - payload_len));
1195 /* Check hash sum */
1196 memset (hash, 0, sizeof (hash));
1197 gcry_md_hash_buffer (GCRY_MD_SHA1, hash,
1198 buffer + buffer_offset, payload_len);
1199 if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
1200 {
1201 sfree (pea.username);
1202 ERROR ("network plugin: Decryption failed: Checksum mismatch.");
1203 return (-1);
1204 }
1206 parse_packet (se, buffer + buffer_offset, payload_len,
1207 flags | PP_ENCRYPTED, pea.username);
1209 /* XXX: Free pea.username?!? */
1211 /* Update return values */
1212 *ret_buffer = buffer + part_size;
1213 *ret_buffer_len = buffer_len - part_size;
1215 sfree (pea.username);
1217 return (0);
1218 } /* }}} int parse_part_encr_aes256 */
1219 /* #endif HAVE_LIBGCRYPT */
1221 #else /* if !HAVE_LIBGCRYPT */
1222 static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
1223 void **ret_buffer, size_t *ret_buffer_size, int flags)
1224 {
1225 static int warning_has_been_printed = 0;
1227 char *buffer;
1228 size_t buffer_size;
1229 size_t buffer_offset;
1231 part_header_t ph;
1232 size_t ph_length;
1234 buffer = *ret_buffer;
1235 buffer_size = *ret_buffer_size;
1236 buffer_offset = 0;
1238 /* parse_packet assures this minimum size. */
1239 assert (buffer_size >= (sizeof (ph.type) + sizeof (ph.length)));
1241 BUFFER_READ (&ph.type, sizeof (ph.type));
1242 BUFFER_READ (&ph.length, sizeof (ph.length));
1243 ph_length = ntohs (ph.length);
1245 if ((ph_length <= PART_ENCRYPTION_AES256_SIZE)
1246 || (ph_length > buffer_size))
1247 {
1248 ERROR ("network plugin: AES-256 encrypted part "
1249 "with invalid length received.");
1250 return (-1);
1251 }
1253 if (warning_has_been_printed == 0)
1254 {
1255 WARNING ("network plugin: Received encrypted packet, but the network "
1256 "plugin was not linked with libgcrypt, so I cannot "
1257 "decrypt it. The part will be discarded.");
1258 warning_has_been_printed = 1;
1259 }
1261 *ret_buffer += ph_length;
1262 *ret_buffer_size -= ph_length;
1264 return (0);
1265 } /* }}} int parse_part_encr_aes256 */
1266 #endif /* !HAVE_LIBGCRYPT */
1268 #undef BUFFER_READ
1270 static int parse_packet (sockent_t *se, /* {{{ */
1271 void *buffer, size_t buffer_size, int flags,
1272 const char *username)
1273 {
1274 int status;
1276 value_list_t vl = VALUE_LIST_INIT;
1277 notification_t n;
1279 #if HAVE_LIBGCRYPT
1280 int packet_was_signed = (flags & PP_SIGNED);
1281 int packet_was_encrypted = (flags & PP_ENCRYPTED);
1282 int printed_ignore_warning = 0;
1283 #endif /* HAVE_LIBGCRYPT */
1286 memset (&vl, '\0', sizeof (vl));
1287 memset (&n, '\0', sizeof (n));
1288 status = 0;
1290 while ((status == 0) && (0 < buffer_size)
1291 && ((unsigned int) buffer_size > sizeof (part_header_t)))
1292 {
1293 uint16_t pkg_length;
1294 uint16_t pkg_type;
1296 memcpy ((void *) &pkg_type,
1297 (void *) buffer,
1298 sizeof (pkg_type));
1299 memcpy ((void *) &pkg_length,
1300 (void *) (buffer + sizeof (pkg_type)),
1301 sizeof (pkg_length));
1303 pkg_length = ntohs (pkg_length);
1304 pkg_type = ntohs (pkg_type);
1306 if (pkg_length > buffer_size)
1307 break;
1308 /* Ensure that this loop terminates eventually */
1309 if (pkg_length < (2 * sizeof (uint16_t)))
1310 break;
1312 if (pkg_type == TYPE_ENCR_AES256)
1313 {
1314 status = parse_part_encr_aes256 (se,
1315 &buffer, &buffer_size, flags);
1316 if (status != 0)
1317 {
1318 ERROR ("network plugin: Decrypting AES256 "
1319 "part failed "
1320 "with status %i.", status);
1321 break;
1322 }
1323 }
1324 #if HAVE_LIBGCRYPT
1325 else if ((se->data.server.security_level == SECURITY_LEVEL_ENCRYPT)
1326 && (packet_was_encrypted == 0))
1327 {
1328 if (printed_ignore_warning == 0)
1329 {
1330 INFO ("network plugin: Unencrypted packet or "
1331 "part has been ignored.");
1332 printed_ignore_warning = 1;
1333 }
1334 buffer = ((char *) buffer) + pkg_length;
1335 continue;
1336 }
1337 #endif /* HAVE_LIBGCRYPT */
1338 else if (pkg_type == TYPE_SIGN_SHA256)
1339 {
1340 status = parse_part_sign_sha256 (se,
1341 &buffer, &buffer_size, flags);
1342 if (status != 0)
1343 {
1344 ERROR ("network plugin: Verifying HMAC-SHA-256 "
1345 "signature failed "
1346 "with status %i.", status);
1347 break;
1348 }
1349 }
1350 #if HAVE_LIBGCRYPT
1351 else if ((se->data.server.security_level == SECURITY_LEVEL_SIGN)
1352 && (packet_was_encrypted == 0)
1353 && (packet_was_signed == 0))
1354 {
1355 if (printed_ignore_warning == 0)
1356 {
1357 INFO ("network plugin: Unsigned packet or "
1358 "part has been ignored.");
1359 printed_ignore_warning = 1;
1360 }
1361 buffer = ((char *) buffer) + pkg_length;
1362 continue;
1363 }
1364 #endif /* HAVE_LIBGCRYPT */
1365 else if (pkg_type == TYPE_VALUES)
1366 {
1367 status = parse_part_values (&buffer, &buffer_size,
1368 &vl.values, &vl.values_len);
1369 if (status != 0)
1370 break;
1372 network_dispatch_values (&vl, username);
1374 sfree (vl.values);
1375 }
1376 else if (pkg_type == TYPE_TIME)
1377 {
1378 uint64_t tmp = 0;
1379 status = parse_part_number (&buffer, &buffer_size,
1380 &tmp);
1381 if (status == 0)
1382 {
1383 vl.time = TIME_T_TO_CDTIME_T (tmp);
1384 n.time = TIME_T_TO_CDTIME_T (tmp);
1385 }
1386 }
1387 else if (pkg_type == TYPE_TIME_HR)
1388 {
1389 uint64_t tmp = 0;
1390 status = parse_part_number (&buffer, &buffer_size,
1391 &tmp);
1392 if (status == 0)
1393 {
1394 vl.time = (cdtime_t) tmp;
1395 n.time = (cdtime_t) tmp;
1396 }
1397 }
1398 else if (pkg_type == TYPE_INTERVAL)
1399 {
1400 uint64_t tmp = 0;
1401 status = parse_part_number (&buffer, &buffer_size,
1402 &tmp);
1403 if (status == 0)
1404 vl.interval = TIME_T_TO_CDTIME_T (tmp);
1405 }
1406 else if (pkg_type == TYPE_INTERVAL_HR)
1407 {
1408 uint64_t tmp = 0;
1409 status = parse_part_number (&buffer, &buffer_size,
1410 &tmp);
1411 if (status == 0)
1412 vl.interval = (cdtime_t) tmp;
1413 }
1414 else if (pkg_type == TYPE_HOST)
1415 {
1416 status = parse_part_string (&buffer, &buffer_size,
1417 vl.host, sizeof (vl.host));
1418 if (status == 0)
1419 sstrncpy (n.host, vl.host, sizeof (n.host));
1420 }
1421 else if (pkg_type == TYPE_PLUGIN)
1422 {
1423 status = parse_part_string (&buffer, &buffer_size,
1424 vl.plugin, sizeof (vl.plugin));
1425 if (status == 0)
1426 sstrncpy (n.plugin, vl.plugin,
1427 sizeof (n.plugin));
1428 }
1429 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
1430 {
1431 status = parse_part_string (&buffer, &buffer_size,
1432 vl.plugin_instance,
1433 sizeof (vl.plugin_instance));
1434 if (status == 0)
1435 sstrncpy (n.plugin_instance,
1436 vl.plugin_instance,
1437 sizeof (n.plugin_instance));
1438 }
1439 else if (pkg_type == TYPE_TYPE)
1440 {
1441 status = parse_part_string (&buffer, &buffer_size,
1442 vl.type, sizeof (vl.type));
1443 if (status == 0)
1444 sstrncpy (n.type, vl.type, sizeof (n.type));
1445 }
1446 else if (pkg_type == TYPE_TYPE_INSTANCE)
1447 {
1448 status = parse_part_string (&buffer, &buffer_size,
1449 vl.type_instance,
1450 sizeof (vl.type_instance));
1451 if (status == 0)
1452 sstrncpy (n.type_instance, vl.type_instance,
1453 sizeof (n.type_instance));
1454 }
1455 else if (pkg_type == TYPE_MESSAGE)
1456 {
1457 status = parse_part_string (&buffer, &buffer_size,
1458 n.message, sizeof (n.message));
1460 if (status != 0)
1461 {
1462 /* do nothing */
1463 }
1464 else if ((n.severity != NOTIF_FAILURE)
1465 && (n.severity != NOTIF_WARNING)
1466 && (n.severity != NOTIF_OKAY))
1467 {
1468 INFO ("network plugin: "
1469 "Ignoring notification with "
1470 "unknown severity %i.",
1471 n.severity);
1472 }
1473 else if (n.time <= 0)
1474 {
1475 INFO ("network plugin: "
1476 "Ignoring notification with "
1477 "time == 0.");
1478 }
1479 else if (strlen (n.message) <= 0)
1480 {
1481 INFO ("network plugin: "
1482 "Ignoring notification with "
1483 "an empty message.");
1484 }
1485 else
1486 {
1487 plugin_dispatch_notification (&n);
1488 }
1489 }
1490 else if (pkg_type == TYPE_SEVERITY)
1491 {
1492 uint64_t tmp = 0;
1493 status = parse_part_number (&buffer, &buffer_size,
1494 &tmp);
1495 if (status == 0)
1496 n.severity = (int) tmp;
1497 }
1498 else
1499 {
1500 DEBUG ("network plugin: parse_packet: Unknown part"
1501 " type: 0x%04hx", pkg_type);
1502 buffer = ((char *) buffer) + pkg_length;
1503 }
1504 } /* while (buffer_size > sizeof (part_header_t)) */
1506 if (status == 0 && buffer_size > 0)
1507 WARNING ("network plugin: parse_packet: Received truncated "
1508 "packet, try increasing `MaxPacketSize'");
1510 return (status);
1511 } /* }}} int parse_packet */
1513 static void free_sockent_client (struct sockent_client *sec) /* {{{ */
1514 {
1515 if (sec->fd >= 0)
1516 {
1517 close (sec->fd);
1518 sec->fd = -1;
1519 }
1520 sfree (sec->addr);
1521 #if HAVE_LIBGCRYPT
1522 sfree (sec->username);
1523 sfree (sec->password);
1524 if (sec->cypher != NULL)
1525 gcry_cipher_close (sec->cypher);
1526 #endif
1527 } /* }}} void free_sockent_client */
1529 static void free_sockent_server (struct sockent_server *ses) /* {{{ */
1530 {
1531 size_t i;
1533 for (i = 0; i < ses->fd_num; i++)
1534 {
1535 if (ses->fd[i] >= 0)
1536 {
1537 close (ses->fd[i]);
1538 ses->fd[i] = -1;
1539 }
1540 }
1542 sfree (ses->fd);
1543 #if HAVE_LIBGCRYPT
1544 sfree (ses->auth_file);
1545 fbh_destroy (ses->userdb);
1546 if (ses->cypher != NULL)
1547 gcry_cipher_close (ses->cypher);
1548 #endif
1549 } /* }}} void free_sockent_server */
1551 static void sockent_destroy (sockent_t *se) /* {{{ */
1552 {
1553 sockent_t *next;
1555 DEBUG ("network plugin: sockent_destroy (se = %p);", (void *) se);
1557 while (se != NULL)
1558 {
1559 next = se->next;
1561 sfree (se->node);
1562 sfree (se->service);
1564 if (se->type == SOCKENT_TYPE_CLIENT)
1565 free_sockent_client (&se->data.client);
1566 else
1567 free_sockent_server (&se->data.server);
1569 sfree (se);
1570 se = next;
1571 }
1572 } /* }}} void sockent_destroy */
1574 /*
1575 * int network_set_ttl
1576 *
1577 * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
1578 * `IPV6_UNICAST_HOPS', depending on which option is applicable.
1579 *
1580 * The `struct addrinfo' is used to destinguish between unicast and multicast
1581 * sockets.
1582 */
1583 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
1584 {
1585 DEBUG ("network plugin: network_set_ttl: network_config_ttl = %i;",
1586 network_config_ttl);
1588 assert (se->type == SOCKENT_TYPE_CLIENT);
1590 if ((network_config_ttl < 1) || (network_config_ttl > 255))
1591 return (-1);
1593 if (ai->ai_family == AF_INET)
1594 {
1595 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1596 int optname;
1598 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1599 optname = IP_MULTICAST_TTL;
1600 else
1601 optname = IP_TTL;
1603 if (setsockopt (se->data.client.fd, IPPROTO_IP, optname,
1604 &network_config_ttl,
1605 sizeof (network_config_ttl)) != 0)
1606 {
1607 char errbuf[1024];
1608 ERROR ("setsockopt: %s",
1609 sstrerror (errno, errbuf, sizeof (errbuf)));
1610 return (-1);
1611 }
1612 }
1613 else if (ai->ai_family == AF_INET6)
1614 {
1615 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1616 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1617 int optname;
1619 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1620 optname = IPV6_MULTICAST_HOPS;
1621 else
1622 optname = IPV6_UNICAST_HOPS;
1624 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, optname,
1625 &network_config_ttl,
1626 sizeof (network_config_ttl)) != 0)
1627 {
1628 char errbuf[1024];
1629 ERROR ("setsockopt: %s",
1630 sstrerror (errno, errbuf,
1631 sizeof (errbuf)));
1632 return (-1);
1633 }
1634 }
1636 return (0);
1637 } /* int network_set_ttl */
1639 static int network_set_interface (const sockent_t *se, const struct addrinfo *ai) /* {{{ */
1640 {
1641 DEBUG ("network plugin: network_set_interface: interface index = %i;",
1642 se->interface);
1644 assert (se->type == SOCKENT_TYPE_CLIENT);
1646 if (ai->ai_family == AF_INET)
1647 {
1648 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1650 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1651 {
1652 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1653 /* If possible, use the "ip_mreqn" structure which has
1654 * an "interface index" member. Using the interface
1655 * index is preferred here, because of its similarity
1656 * to the way IPv6 handles this. Unfortunately, it
1657 * appears not to be portable. */
1658 struct ip_mreqn mreq;
1660 memset (&mreq, 0, sizeof (mreq));
1661 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1662 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
1663 mreq.imr_ifindex = se->interface;
1664 #else
1665 struct ip_mreq mreq;
1667 memset (&mreq, 0, sizeof (mreq));
1668 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1669 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
1670 #endif
1672 if (setsockopt (se->data.client.fd, IPPROTO_IP, IP_MULTICAST_IF,
1673 &mreq, sizeof (mreq)) != 0)
1674 {
1675 char errbuf[1024];
1676 ERROR ("setsockopt: %s",
1677 sstrerror (errno, errbuf, sizeof (errbuf)));
1678 return (-1);
1679 }
1681 return (0);
1682 }
1683 }
1684 else if (ai->ai_family == AF_INET6)
1685 {
1686 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1688 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1689 {
1690 if (setsockopt (se->data.client.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
1691 &se->interface,
1692 sizeof (se->interface)) != 0)
1693 {
1694 char errbuf[1024];
1695 ERROR ("setsockopt: %s",
1696 sstrerror (errno, errbuf,
1697 sizeof (errbuf)));
1698 return (-1);
1699 }
1701 return (0);
1702 }
1703 }
1705 /* else: Not a multicast interface. */
1706 #if defined(HAVE_IF_INDEXTONAME) && HAVE_IF_INDEXTONAME && defined(SO_BINDTODEVICE)
1707 if (se->interface != 0)
1708 {
1709 char interface_name[IFNAMSIZ];
1711 if (if_indextoname (se->interface, interface_name) == NULL)
1712 return (-1);
1714 DEBUG ("network plugin: Binding socket to interface %s", interface_name);
1716 if (setsockopt (se->data.client.fd, SOL_SOCKET, SO_BINDTODEVICE,
1717 interface_name,
1718 sizeof(interface_name)) == -1 )
1719 {
1720 char errbuf[1024];
1721 ERROR ("setsockopt: %s",
1722 sstrerror (errno, errbuf, sizeof (errbuf)));
1723 return (-1);
1724 }
1725 }
1726 /* #endif HAVE_IF_INDEXTONAME && SO_BINDTODEVICE */
1728 #else
1729 WARNING ("network plugin: Cannot set the interface on a unicast "
1730 "socket because "
1731 # if !defined(SO_BINDTODEVICE)
1732 "the the \"SO_BINDTODEVICE\" socket option "
1733 # else
1734 "the \"if_indextoname\" function "
1735 # endif
1736 "is not available on your system.");
1737 #endif
1739 return (0);
1740 } /* }}} network_set_interface */
1742 static int network_bind_socket (int fd, const struct addrinfo *ai, const int interface_idx)
1743 {
1744 int loop = 0;
1745 int yes = 1;
1747 /* allow multiple sockets to use the same PORT number */
1748 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR,
1749 &yes, sizeof(yes)) == -1) {
1750 char errbuf[1024];
1751 ERROR ("setsockopt: %s",
1752 sstrerror (errno, errbuf, sizeof (errbuf)));
1753 return (-1);
1754 }
1756 DEBUG ("fd = %i; calling `bind'", fd);
1758 if (bind (fd, ai->ai_addr, ai->ai_addrlen) == -1)
1759 {
1760 char errbuf[1024];
1761 ERROR ("bind: %s",
1762 sstrerror (errno, errbuf, sizeof (errbuf)));
1763 return (-1);
1764 }
1766 if (ai->ai_family == AF_INET)
1767 {
1768 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
1769 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
1770 {
1771 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1772 struct ip_mreqn mreq;
1773 #else
1774 struct ip_mreq mreq;
1775 #endif
1777 DEBUG ("fd = %i; IPv4 multicast address found", fd);
1779 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
1780 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
1781 /* Set the interface using the interface index if
1782 * possible (available). Unfortunately, the struct
1783 * ip_mreqn is not portable. */
1784 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
1785 mreq.imr_ifindex = interface_idx;
1786 #else
1787 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
1788 #endif
1790 if (setsockopt (fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1791 &loop, sizeof (loop)) == -1)
1792 {
1793 char errbuf[1024];
1794 ERROR ("setsockopt: %s",
1795 sstrerror (errno, errbuf,
1796 sizeof (errbuf)));
1797 return (-1);
1798 }
1800 if (setsockopt (fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
1801 &mreq, sizeof (mreq)) == -1)
1802 {
1803 char errbuf[1024];
1804 ERROR ("setsockopt: %s",
1805 sstrerror (errno, errbuf,
1806 sizeof (errbuf)));
1807 return (-1);
1808 }
1810 return (0);
1811 }
1812 }
1813 else if (ai->ai_family == AF_INET6)
1814 {
1815 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
1816 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
1817 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
1818 {
1819 struct ipv6_mreq mreq;
1821 DEBUG ("fd = %i; IPv6 multicast address found", fd);
1823 memcpy (&mreq.ipv6mr_multiaddr,
1824 &addr->sin6_addr,
1825 sizeof (addr->sin6_addr));
1827 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
1828 * ipv6mr_interface may be set to zeroes to
1829 * choose the default multicast interface or to
1830 * the index of a particular multicast-capable
1831 * interface if the host is multihomed.
1832 * Membership is associ-associated with a
1833 * single interface; programs running on
1834 * multihomed hosts may need to join the same
1835 * group on more than one interface.*/
1836 mreq.ipv6mr_interface = interface_idx;
1838 if (setsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1839 &loop, sizeof (loop)) == -1)
1840 {
1841 char errbuf[1024];
1842 ERROR ("setsockopt: %s",
1843 sstrerror (errno, errbuf,
1844 sizeof (errbuf)));
1845 return (-1);
1846 }
1848 if (setsockopt (fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1849 &mreq, sizeof (mreq)) == -1)
1850 {
1851 char errbuf[1024];
1852 ERROR ("setsockopt: %s",
1853 sstrerror (errno, errbuf,
1854 sizeof (errbuf)));
1855 return (-1);
1856 }
1858 return (0);
1859 }
1860 }
1862 #if defined(HAVE_IF_INDEXTONAME) && HAVE_IF_INDEXTONAME && defined(SO_BINDTODEVICE)
1863 /* if a specific interface was set, bind the socket to it. But to avoid
1864 * possible problems with multicast routing, only do that for non-multicast
1865 * addresses */
1866 if (interface_idx != 0)
1867 {
1868 char interface_name[IFNAMSIZ];
1870 if (if_indextoname (interface_idx, interface_name) == NULL)
1871 return (-1);
1873 DEBUG ("fd = %i; Binding socket to interface %s", fd, interface_name);
1875 if (setsockopt (fd, SOL_SOCKET, SO_BINDTODEVICE,
1876 interface_name,
1877 sizeof(interface_name)) == -1 )
1878 {
1879 char errbuf[1024];
1880 ERROR ("setsockopt: %s",
1881 sstrerror (errno, errbuf, sizeof (errbuf)));
1882 return (-1);
1883 }
1884 }
1885 #endif /* HAVE_IF_INDEXTONAME && SO_BINDTODEVICE */
1887 return (0);
1888 } /* int network_bind_socket */
1890 /* Initialize a sockent structure. `type' must be either `SOCKENT_TYPE_CLIENT'
1891 * or `SOCKENT_TYPE_SERVER' */
1892 static int sockent_init (sockent_t *se, int type) /* {{{ */
1893 {
1894 if (se == NULL)
1895 return (-1);
1897 memset (se, 0, sizeof (*se));
1899 se->type = SOCKENT_TYPE_CLIENT;
1900 se->node = NULL;
1901 se->service = NULL;
1902 se->interface = 0;
1903 se->next = NULL;
1905 if (type == SOCKENT_TYPE_SERVER)
1906 {
1907 se->type = SOCKENT_TYPE_SERVER;
1908 se->data.server.fd = NULL;
1909 #if HAVE_LIBGCRYPT
1910 se->data.server.security_level = SECURITY_LEVEL_NONE;
1911 se->data.server.auth_file = NULL;
1912 se->data.server.userdb = NULL;
1913 se->data.server.cypher = NULL;
1914 #endif
1915 }
1916 else
1917 {
1918 se->data.client.fd = -1;
1919 se->data.client.addr = NULL;
1920 #if HAVE_LIBGCRYPT
1921 se->data.client.security_level = SECURITY_LEVEL_NONE;
1922 se->data.client.username = NULL;
1923 se->data.client.password = NULL;
1924 se->data.client.cypher = NULL;
1925 #endif
1926 }
1928 return (0);
1929 } /* }}} int sockent_init */
1931 /* Open the file descriptors for a initialized sockent structure. */
1932 static int sockent_open (sockent_t *se) /* {{{ */
1933 {
1934 struct addrinfo ai_hints;
1935 struct addrinfo *ai_list, *ai_ptr;
1936 int ai_return;
1938 const char *node;
1939 const char *service;
1941 if (se == NULL)
1942 return (-1);
1944 /* Set up the security structures. */
1945 #if HAVE_LIBGCRYPT /* {{{ */
1946 if (se->type == SOCKENT_TYPE_CLIENT)
1947 {
1948 if (se->data.client.security_level > SECURITY_LEVEL_NONE)
1949 {
1950 if ((se->data.client.username == NULL)
1951 || (se->data.client.password == NULL))
1952 {
1953 ERROR ("network plugin: Client socket with "
1954 "security requested, but no "
1955 "credentials are configured.");
1956 return (-1);
1957 }
1958 gcry_md_hash_buffer (GCRY_MD_SHA256,
1959 se->data.client.password_hash,
1960 se->data.client.password,
1961 strlen (se->data.client.password));
1962 }
1963 }
1964 else /* (se->type == SOCKENT_TYPE_SERVER) */
1965 {
1966 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1967 {
1968 if (se->data.server.auth_file == NULL)
1969 {
1970 ERROR ("network plugin: Server socket with "
1971 "security requested, but no "
1972 "password file is configured.");
1973 return (-1);
1974 }
1975 }
1976 if (se->data.server.auth_file != NULL)
1977 {
1978 se->data.server.userdb = fbh_create (se->data.server.auth_file);
1979 if (se->data.server.userdb == NULL)
1980 {
1981 ERROR ("network plugin: Reading password file "
1982 "`%s' failed.",
1983 se->data.server.auth_file);
1984 if (se->data.server.security_level > SECURITY_LEVEL_NONE)
1985 return (-1);
1986 }
1987 }
1988 }
1989 #endif /* }}} HAVE_LIBGCRYPT */
1991 node = se->node;
1992 service = se->service;
1994 if (service == NULL)
1995 service = NET_DEFAULT_PORT;
1997 DEBUG ("network plugin: sockent_open: node = %s; service = %s;",
1998 node, service);
2000 memset (&ai_hints, 0, sizeof (ai_hints));
2001 ai_hints.ai_flags = 0;
2002 #ifdef AI_PASSIVE
2003 ai_hints.ai_flags |= AI_PASSIVE;
2004 #endif
2005 #ifdef AI_ADDRCONFIG
2006 ai_hints.ai_flags |= AI_ADDRCONFIG;
2007 #endif
2008 ai_hints.ai_family = AF_UNSPEC;
2009 ai_hints.ai_socktype = SOCK_DGRAM;
2010 ai_hints.ai_protocol = IPPROTO_UDP;
2012 ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
2013 if (ai_return != 0)
2014 {
2015 ERROR ("network plugin: getaddrinfo (%s, %s) failed: %s",
2016 (se->node == NULL) ? "(null)" : se->node,
2017 (se->service == NULL) ? "(null)" : se->service,
2018 gai_strerror (ai_return));
2019 return (-1);
2020 }
2022 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2023 {
2024 int status;
2026 if (se->type == SOCKENT_TYPE_SERVER) /* {{{ */
2027 {
2028 int *tmp;
2030 tmp = realloc (se->data.server.fd,
2031 sizeof (*tmp) * (se->data.server.fd_num + 1));
2032 if (tmp == NULL)
2033 {
2034 ERROR ("network plugin: realloc failed.");
2035 continue;
2036 }
2037 se->data.server.fd = tmp;
2038 tmp = se->data.server.fd + se->data.server.fd_num;
2040 *tmp = socket (ai_ptr->ai_family, ai_ptr->ai_socktype,
2041 ai_ptr->ai_protocol);
2042 if (*tmp < 0)
2043 {
2044 char errbuf[1024];
2045 ERROR ("network plugin: socket(2) failed: %s",
2046 sstrerror (errno, errbuf,
2047 sizeof (errbuf)));
2048 continue;
2049 }
2051 status = network_bind_socket (*tmp, ai_ptr, se->interface);
2052 if (status != 0)
2053 {
2054 close (*tmp);
2055 *tmp = -1;
2056 continue;
2057 }
2059 se->data.server.fd_num++;
2060 continue;
2061 } /* }}} if (se->type == SOCKENT_TYPE_SERVER) */
2062 else /* if (se->type == SOCKENT_TYPE_CLIENT) {{{ */
2063 {
2064 se->data.client.fd = socket (ai_ptr->ai_family,
2065 ai_ptr->ai_socktype,
2066 ai_ptr->ai_protocol);
2067 if (se->data.client.fd < 0)
2068 {
2069 char errbuf[1024];
2070 ERROR ("network plugin: socket(2) failed: %s",
2071 sstrerror (errno, errbuf,
2072 sizeof (errbuf)));
2073 continue;
2074 }
2076 se->data.client.addr = malloc (sizeof (*se->data.client.addr));
2077 if (se->data.client.addr == NULL)
2078 {
2079 ERROR ("network plugin: malloc failed.");
2080 close (se->data.client.fd);
2081 se->data.client.fd = -1;
2082 continue;
2083 }
2085 memset (se->data.client.addr, 0, sizeof (*se->data.client.addr));
2086 assert (sizeof (*se->data.client.addr) >= ai_ptr->ai_addrlen);
2087 memcpy (se->data.client.addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
2088 se->data.client.addrlen = ai_ptr->ai_addrlen;
2090 network_set_ttl (se, ai_ptr);
2091 network_set_interface (se, ai_ptr);
2093 /* We don't open more than one write-socket per
2094 * node/service pair.. */
2095 break;
2096 } /* }}} if (se->type == SOCKENT_TYPE_CLIENT) */
2097 } /* for (ai_list) */
2099 freeaddrinfo (ai_list);
2101 /* Check if all went well. */
2102 if (se->type == SOCKENT_TYPE_SERVER)
2103 {
2104 if (se->data.server.fd_num <= 0)
2105 return (-1);
2106 }
2107 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
2108 {
2109 if (se->data.client.fd < 0)
2110 return (-1);
2111 }
2113 return (0);
2114 } /* }}} int sockent_open */
2116 /* Add a sockent to the global list of sockets */
2117 static int sockent_add (sockent_t *se) /* {{{ */
2118 {
2119 sockent_t *last_ptr;
2121 if (se == NULL)
2122 return (-1);
2124 if (se->type == SOCKENT_TYPE_SERVER)
2125 {
2126 struct pollfd *tmp;
2127 size_t i;
2129 tmp = realloc (listen_sockets_pollfd,
2130 sizeof (*tmp) * (listen_sockets_num
2131 + se->data.server.fd_num));
2132 if (tmp == NULL)
2133 {
2134 ERROR ("network plugin: realloc failed.");
2135 return (-1);
2136 }
2137 listen_sockets_pollfd = tmp;
2138 tmp = listen_sockets_pollfd + listen_sockets_num;
2140 for (i = 0; i < se->data.server.fd_num; i++)
2141 {
2142 memset (tmp + i, 0, sizeof (*tmp));
2143 tmp[i].fd = se->data.server.fd[i];
2144 tmp[i].events = POLLIN | POLLPRI;
2145 tmp[i].revents = 0;
2146 }
2148 listen_sockets_num += se->data.server.fd_num;
2150 if (listen_sockets == NULL)
2151 {
2152 listen_sockets = se;
2153 return (0);
2154 }
2155 last_ptr = listen_sockets;
2156 }
2157 else /* if (se->type == SOCKENT_TYPE_CLIENT) */
2158 {
2159 if (sending_sockets == NULL)
2160 {
2161 sending_sockets = se;
2162 return (0);
2163 }
2164 last_ptr = sending_sockets;
2165 }
2167 while (last_ptr->next != NULL)
2168 last_ptr = last_ptr->next;
2169 last_ptr->next = se;
2171 return (0);
2172 } /* }}} int sockent_add */
2174 static void *dispatch_thread (void __attribute__((unused)) *arg) /* {{{ */
2175 {
2176 while (42)
2177 {
2178 receive_list_entry_t *ent;
2179 sockent_t *se;
2181 /* Lock and wait for more data to come in */
2182 pthread_mutex_lock (&receive_list_lock);
2183 while ((listen_loop == 0)
2184 && (receive_list_head == NULL))
2185 pthread_cond_wait (&receive_list_cond, &receive_list_lock);
2187 /* Remove the head entry and unlock */
2188 ent = receive_list_head;
2189 if (ent != NULL)
2190 receive_list_head = ent->next;
2191 receive_list_length--;
2192 pthread_mutex_unlock (&receive_list_lock);
2194 /* Check whether we are supposed to exit. We do NOT check `listen_loop'
2195 * because we dispatch all missing packets before shutting down. */
2196 if (ent == NULL)
2197 break;
2199 /* Look for the correct `sockent_t' */
2200 se = listen_sockets;
2201 while (se != NULL)
2202 {
2203 size_t i;
2205 for (i = 0; i < se->data.server.fd_num; i++)
2206 if (se->data.server.fd[i] == ent->fd)
2207 break;
2209 if (i < se->data.server.fd_num)
2210 break;
2212 se = se->next;
2213 }
2215 if (se == NULL)
2216 {
2217 ERROR ("network plugin: Got packet from FD %i, but can't "
2218 "find an appropriate socket entry.",
2219 ent->fd);
2220 sfree (ent->data);
2221 sfree (ent);
2222 continue;
2223 }
2225 parse_packet (se, ent->data, ent->data_len, /* flags = */ 0,
2226 /* username = */ NULL);
2227 sfree (ent->data);
2228 sfree (ent);
2229 } /* while (42) */
2231 return (NULL);
2232 } /* }}} void *dispatch_thread */
2234 static int network_receive (void) /* {{{ */
2235 {
2236 char buffer[network_config_packet_size];
2237 int buffer_len;
2239 int i;
2240 int status;
2242 receive_list_entry_t *private_list_head;
2243 receive_list_entry_t *private_list_tail;
2244 uint64_t private_list_length;
2246 assert (listen_sockets_num > 0);
2248 private_list_head = NULL;
2249 private_list_tail = NULL;
2250 private_list_length = 0;
2252 while (listen_loop == 0)
2253 {
2254 status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
2256 if (status <= 0)
2257 {
2258 char errbuf[1024];
2259 if (errno == EINTR)
2260 continue;
2261 ERROR ("poll failed: %s",
2262 sstrerror (errno, errbuf, sizeof (errbuf)));
2263 return (-1);
2264 }
2266 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
2267 {
2268 receive_list_entry_t *ent;
2270 if ((listen_sockets_pollfd[i].revents
2271 & (POLLIN | POLLPRI)) == 0)
2272 continue;
2273 status--;
2275 buffer_len = recv (listen_sockets_pollfd[i].fd,
2276 buffer, sizeof (buffer),
2277 0 /* no flags */);
2278 if (buffer_len < 0)
2279 {
2280 char errbuf[1024];
2281 ERROR ("recv failed: %s",
2282 sstrerror (errno, errbuf,
2283 sizeof (errbuf)));
2284 return (-1);
2285 }
2287 stats_octets_rx += ((uint64_t) buffer_len);
2288 stats_packets_rx++;
2290 /* TODO: Possible performance enhancement: Do not free
2291 * these entries in the dispatch thread but put them in
2292 * another list, so we don't have to allocate more and
2293 * more of these structures. */
2294 ent = malloc (sizeof (receive_list_entry_t));
2295 if (ent == NULL)
2296 {
2297 ERROR ("network plugin: malloc failed.");
2298 return (-1);
2299 }
2300 memset (ent, 0, sizeof (receive_list_entry_t));
2301 ent->data = malloc (network_config_packet_size);
2302 if (ent->data == NULL)
2303 {
2304 sfree (ent);
2305 ERROR ("network plugin: malloc failed.");
2306 return (-1);
2307 }
2308 ent->fd = listen_sockets_pollfd[i].fd;
2309 ent->next = NULL;
2311 memcpy (ent->data, buffer, buffer_len);
2312 ent->data_len = buffer_len;
2314 if (private_list_head == NULL)
2315 private_list_head = ent;
2316 else
2317 private_list_tail->next = ent;
2318 private_list_tail = ent;
2319 private_list_length++;
2321 /* Do not block here. Blocking here has led to
2322 * insufficient performance in the past. */
2323 if (pthread_mutex_trylock (&receive_list_lock) == 0)
2324 {
2325 assert (((receive_list_head == NULL) && (receive_list_length == 0))
2326 || ((receive_list_head != NULL) && (receive_list_length != 0)));
2328 if (receive_list_head == NULL)
2329 receive_list_head = private_list_head;
2330 else
2331 receive_list_tail->next = private_list_head;
2332 receive_list_tail = private_list_tail;
2333 receive_list_length += private_list_length;
2335 pthread_cond_signal (&receive_list_cond);
2336 pthread_mutex_unlock (&receive_list_lock);
2338 private_list_head = NULL;
2339 private_list_tail = NULL;
2340 private_list_length = 0;
2341 }
2342 } /* for (listen_sockets_pollfd) */
2343 } /* while (listen_loop == 0) */
2345 /* Make sure everything is dispatched before exiting. */
2346 if (private_list_head != NULL)
2347 {
2348 pthread_mutex_lock (&receive_list_lock);
2350 if (receive_list_head == NULL)
2351 receive_list_head = private_list_head;
2352 else
2353 receive_list_tail->next = private_list_head;
2354 receive_list_tail = private_list_tail;
2355 receive_list_length += private_list_length;
2357 private_list_head = NULL;
2358 private_list_tail = NULL;
2359 private_list_length = 0;
2361 pthread_cond_signal (&receive_list_cond);
2362 pthread_mutex_unlock (&receive_list_lock);
2363 }
2365 return (0);
2366 } /* }}} int network_receive */
2368 static void *receive_thread (void __attribute__((unused)) *arg)
2369 {
2370 return (network_receive () ? (void *) 1 : (void *) 0);
2371 } /* void *receive_thread */
2373 static void network_init_buffer (void)
2374 {
2375 memset (send_buffer, 0, network_config_packet_size);
2376 send_buffer_ptr = send_buffer;
2377 send_buffer_fill = 0;
2379 memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
2380 } /* int network_init_buffer */
2382 static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */
2383 const char *buffer, size_t buffer_size)
2384 {
2385 int status;
2387 while (42)
2388 {
2389 status = sendto (se->data.client.fd, buffer, buffer_size,
2390 /* flags = */ 0,
2391 (struct sockaddr *) se->data.client.addr,
2392 se->data.client.addrlen);
2393 if (status < 0)
2394 {
2395 char errbuf[1024];
2396 if (errno == EINTR)
2397 continue;
2398 ERROR ("network plugin: sendto failed: %s",
2399 sstrerror (errno, errbuf,
2400 sizeof (errbuf)));
2401 break;
2402 }
2404 break;
2405 } /* while (42) */
2406 } /* }}} void networt_send_buffer_plain */
2408 #if HAVE_LIBGCRYPT
2409 #define BUFFER_ADD(p,s) do { \
2410 memcpy (buffer + buffer_offset, (p), (s)); \
2411 buffer_offset += (s); \
2412 } while (0)
2414 static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */
2415 const char *in_buffer, size_t in_buffer_size)
2416 {
2417 part_signature_sha256_t ps;
2418 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2419 size_t buffer_offset;
2420 size_t username_len;
2422 gcry_md_hd_t hd;
2423 gcry_error_t err;
2424 unsigned char *hash;
2426 hd = NULL;
2427 err = gcry_md_open (&hd, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC);
2428 if (err != 0)
2429 {
2430 ERROR ("network plugin: Creating HMAC object failed: %s",
2431 gcry_strerror (err));
2432 return;
2433 }
2435 err = gcry_md_setkey (hd, se->data.client.password,
2436 strlen (se->data.client.password));
2437 if (err != 0)
2438 {
2439 ERROR ("network plugin: gcry_md_setkey failed: %s",
2440 gcry_strerror (err));
2441 gcry_md_close (hd);
2442 return;
2443 }
2445 username_len = strlen (se->data.client.username);
2446 if (username_len > (BUFF_SIG_SIZE - PART_SIGNATURE_SHA256_SIZE))
2447 {
2448 ERROR ("network plugin: Username too long: %s",
2449 se->data.client.username);
2450 return;
2451 }
2453 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE,
2454 se->data.client.username, username_len);
2455 memcpy (buffer + PART_SIGNATURE_SHA256_SIZE + username_len,
2456 in_buffer, in_buffer_size);
2458 /* Initialize the `ps' structure. */
2459 memset (&ps, 0, sizeof (ps));
2460 ps.head.type = htons (TYPE_SIGN_SHA256);
2461 ps.head.length = htons (PART_SIGNATURE_SHA256_SIZE + username_len);
2463 /* Calculate the hash value. */
2464 gcry_md_write (hd, buffer + PART_SIGNATURE_SHA256_SIZE,
2465 username_len + in_buffer_size);
2466 hash = gcry_md_read (hd, GCRY_MD_SHA256);
2467 if (hash == NULL)
2468 {
2469 ERROR ("network plugin: gcry_md_read failed.");
2470 gcry_md_close (hd);
2471 return;
2472 }
2473 memcpy (ps.hash, hash, sizeof (ps.hash));
2475 /* Add the header */
2476 buffer_offset = 0;
2478 BUFFER_ADD (&ps.head.type, sizeof (ps.head.type));
2479 BUFFER_ADD (&ps.head.length, sizeof (ps.head.length));
2480 BUFFER_ADD (ps.hash, sizeof (ps.hash));
2482 assert (buffer_offset == PART_SIGNATURE_SHA256_SIZE);
2484 gcry_md_close (hd);
2485 hd = NULL;
2487 buffer_offset = PART_SIGNATURE_SHA256_SIZE + username_len + in_buffer_size;
2488 networt_send_buffer_plain (se, buffer, buffer_offset);
2489 } /* }}} void networt_send_buffer_signed */
2491 static void networt_send_buffer_encrypted (sockent_t *se, /* {{{ */
2492 const char *in_buffer, size_t in_buffer_size)
2493 {
2494 part_encryption_aes256_t pea;
2495 char buffer[BUFF_SIG_SIZE + in_buffer_size];
2496 size_t buffer_size;
2497 size_t buffer_offset;
2498 size_t header_size;
2499 size_t username_len;
2500 gcry_error_t err;
2501 gcry_cipher_hd_t cypher;
2503 /* Initialize the header fields */
2504 memset (&pea, 0, sizeof (pea));
2505 pea.head.type = htons (TYPE_ENCR_AES256);
2507 pea.username = se->data.client.username;
2509 username_len = strlen (pea.username);
2510 if ((PART_ENCRYPTION_AES256_SIZE + username_len) > BUFF_SIG_SIZE)
2511 {
2512 ERROR ("network plugin: Username too long: %s", pea.username);
2513 return;
2514 }
2516 buffer_size = PART_ENCRYPTION_AES256_SIZE + username_len + in_buffer_size;
2517 header_size = PART_ENCRYPTION_AES256_SIZE + username_len
2518 - sizeof (pea.hash);
2520 assert (buffer_size <= sizeof (buffer));
2521 DEBUG ("network plugin: networt_send_buffer_encrypted: "
2522 "buffer_size = %zu;", buffer_size);
2524 pea.head.length = htons ((uint16_t) (PART_ENCRYPTION_AES256_SIZE
2525 + username_len + in_buffer_size));
2526 pea.username_length = htons ((uint16_t) username_len);
2528 /* Chose a random initialization vector. */
2529 gcry_randomize ((void *) &pea.iv, sizeof (pea.iv), GCRY_STRONG_RANDOM);
2531 /* Create hash of the payload */
2532 gcry_md_hash_buffer (GCRY_MD_SHA1, pea.hash, in_buffer, in_buffer_size);
2534 /* Initialize the buffer */
2535 buffer_offset = 0;
2536 memset (buffer, 0, sizeof (buffer));
2539 BUFFER_ADD (&pea.head.type, sizeof (pea.head.type));
2540 BUFFER_ADD (&pea.head.length, sizeof (pea.head.length));
2541 BUFFER_ADD (&pea.username_length, sizeof (pea.username_length));
2542 BUFFER_ADD (pea.username, username_len);
2543 BUFFER_ADD (pea.iv, sizeof (pea.iv));
2544 assert (buffer_offset == header_size);
2545 BUFFER_ADD (pea.hash, sizeof (pea.hash));
2546 BUFFER_ADD (in_buffer, in_buffer_size);
2548 assert (buffer_offset == buffer_size);
2550 cypher = network_get_aes256_cypher (se, pea.iv, sizeof (pea.iv),
2551 se->data.client.password);
2552 if (cypher == NULL)
2553 return;
2555 /* Encrypt the buffer in-place */
2556 err = gcry_cipher_encrypt (cypher,
2557 buffer + header_size,
2558 buffer_size - header_size,
2559 /* in = */ NULL, /* in len = */ 0);
2560 if (err != 0)
2561 {
2562 ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
2563 gcry_strerror (err));
2564 return;
2565 }
2567 /* Send it out without further modifications */
2568 networt_send_buffer_plain (se, buffer, buffer_size);
2569 } /* }}} void networt_send_buffer_encrypted */
2570 #undef BUFFER_ADD
2571 #endif /* HAVE_LIBGCRYPT */
2573 static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
2574 {
2575 sockent_t *se;
2577 DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
2579 for (se = sending_sockets; se != NULL; se = se->next)
2580 {
2581 #if HAVE_LIBGCRYPT
2582 if (se->data.client.security_level == SECURITY_LEVEL_ENCRYPT)
2583 networt_send_buffer_encrypted (se, buffer, buffer_len);
2584 else if (se->data.client.security_level == SECURITY_LEVEL_SIGN)
2585 networt_send_buffer_signed (se, buffer, buffer_len);
2586 else /* if (se->data.client.security_level == SECURITY_LEVEL_NONE) */
2587 #endif /* HAVE_LIBGCRYPT */
2588 networt_send_buffer_plain (se, buffer, buffer_len);
2589 } /* for (sending_sockets) */
2590 } /* }}} void network_send_buffer */
2592 static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
2593 value_list_t *vl_def,
2594 const data_set_t *ds, const value_list_t *vl)
2595 {
2596 char *buffer_orig = buffer;
2598 if (strcmp (vl_def->host, vl->host) != 0)
2599 {
2600 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
2601 vl->host, strlen (vl->host)) != 0)
2602 return (-1);
2603 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
2604 }
2606 if (vl_def->time != vl->time)
2607 {
2608 if (write_part_number (&buffer, &buffer_size, TYPE_TIME_HR,
2609 (uint64_t) vl->time))
2610 return (-1);
2611 vl_def->time = vl->time;
2612 }
2614 if (vl_def->interval != vl->interval)
2615 {
2616 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL_HR,
2617 (uint64_t) vl->interval))
2618 return (-1);
2619 vl_def->interval = vl->interval;
2620 }
2622 if (strcmp (vl_def->plugin, vl->plugin) != 0)
2623 {
2624 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
2625 vl->plugin, strlen (vl->plugin)) != 0)
2626 return (-1);
2627 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
2628 }
2630 if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
2631 {
2632 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
2633 vl->plugin_instance,
2634 strlen (vl->plugin_instance)) != 0)
2635 return (-1);
2636 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
2637 }
2639 if (strcmp (vl_def->type, vl->type) != 0)
2640 {
2641 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
2642 vl->type, strlen (vl->type)) != 0)
2643 return (-1);
2644 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
2645 }
2647 if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
2648 {
2649 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
2650 vl->type_instance,
2651 strlen (vl->type_instance)) != 0)
2652 return (-1);
2653 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
2654 }
2656 if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
2657 return (-1);
2659 return (buffer - buffer_orig);
2660 } /* }}} int add_to_buffer */
2662 static void flush_buffer (void)
2663 {
2664 DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
2665 send_buffer_fill);
2667 network_send_buffer (send_buffer, (size_t) send_buffer_fill);
2669 stats_octets_tx += ((uint64_t) send_buffer_fill);
2670 stats_packets_tx++;
2672 network_init_buffer ();
2673 }
2675 static int network_write (const data_set_t *ds, const value_list_t *vl,
2676 user_data_t __attribute__((unused)) *user_data)
2677 {
2678 int status;
2680 if (!check_send_okay (vl))
2681 {
2682 #if COLLECT_DEBUG
2683 char name[6*DATA_MAX_NAME_LEN];
2684 FORMAT_VL (name, sizeof (name), vl);
2685 name[sizeof (name) - 1] = 0;
2686 DEBUG ("network plugin: network_write: "
2687 "NOT sending %s.", name);
2688 #endif
2689 /* Counter is not protected by another lock and may be reached by
2690 * multiple threads */
2691 pthread_mutex_lock (&stats_lock);
2692 stats_values_not_sent++;
2693 pthread_mutex_unlock (&stats_lock);
2694 return (0);
2695 }
2697 uc_meta_data_add_unsigned_int (vl,
2698 "network:time_sent", (uint64_t) vl->time);
2700 pthread_mutex_lock (&send_buffer_lock);
2702 status = add_to_buffer (send_buffer_ptr,
2703 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2704 &send_buffer_vl,
2705 ds, vl);
2706 if (status >= 0)
2707 {
2708 /* status == bytes added to the buffer */
2709 send_buffer_fill += status;
2710 send_buffer_ptr += status;
2712 stats_values_sent++;
2713 }
2714 else
2715 {
2716 flush_buffer ();
2718 status = add_to_buffer (send_buffer_ptr,
2719 network_config_packet_size - (send_buffer_fill + BUFF_SIG_SIZE),
2720 &send_buffer_vl,
2721 ds, vl);
2723 if (status >= 0)
2724 {
2725 send_buffer_fill += status;
2726 send_buffer_ptr += status;
2728 stats_values_sent++;
2729 }
2730 }
2732 if (status < 0)
2733 {
2734 ERROR ("network plugin: Unable to append to the "
2735 "buffer for some weird reason");
2736 }
2737 else if ((network_config_packet_size - send_buffer_fill) < 15)
2738 {
2739 flush_buffer ();
2740 }
2742 pthread_mutex_unlock (&send_buffer_lock);
2744 return ((status < 0) ? -1 : 0);
2745 } /* int network_write */
2747 static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
2748 int *retval)
2749 {
2750 if ((ci->values_num != 1)
2751 || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
2752 && (ci->values[0].type != OCONFIG_TYPE_STRING)))
2753 {
2754 ERROR ("network plugin: The `%s' config option needs "
2755 "exactly one boolean argument.", ci->key);
2756 return (-1);
2757 }
2759 if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
2760 {
2761 if (ci->values[0].value.boolean)
2762 *retval = 1;
2763 else
2764 *retval = 0;
2765 }
2766 else
2767 {
2768 char *str = ci->values[0].value.string;
2770 if (IS_TRUE (str))
2771 *retval = 1;
2772 else if (IS_FALSE (str))
2773 *retval = 0;
2774 else
2775 {
2776 ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
2777 "option as boolean value.",
2778 str, ci->key);
2779 return (-1);
2780 }
2781 }
2783 return (0);
2784 } /* }}} int network_config_set_boolean */
2786 static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
2787 {
2788 int tmp;
2789 if ((ci->values_num != 1)
2790 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2791 {
2792 WARNING ("network plugin: The `TimeToLive' config option needs exactly "
2793 "one numeric argument.");
2794 return (-1);
2795 }
2797 tmp = (int) ci->values[0].value.number;
2798 if ((tmp > 0) && (tmp <= 255))
2799 network_config_ttl = tmp;
2801 return (0);
2802 } /* }}} int network_config_set_ttl */
2804 static int network_config_set_interface (const oconfig_item_t *ci, /* {{{ */
2805 int *interface)
2806 {
2807 if ((ci->values_num != 1)
2808 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2809 {
2810 WARNING ("network plugin: The `Interface' config option needs exactly "
2811 "one string argument.");
2812 return (-1);
2813 }
2815 if (interface == NULL)
2816 return (-1);
2818 *interface = if_nametoindex (ci->values[0].value.string);
2820 return (0);
2821 } /* }}} int network_config_set_interface */
2823 static int network_config_set_buffer_size (const oconfig_item_t *ci) /* {{{ */
2824 {
2825 int tmp;
2826 if ((ci->values_num != 1)
2827 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
2828 {
2829 WARNING ("network plugin: The `MaxPacketSize' config option needs exactly "
2830 "one numeric argument.");
2831 return (-1);
2832 }
2834 tmp = (int) ci->values[0].value.number;
2835 if ((tmp >= 1024) && (tmp <= 65535))
2836 network_config_packet_size = tmp;
2838 return (0);
2839 } /* }}} int network_config_set_buffer_size */
2841 #if HAVE_LIBGCRYPT
2842 static int network_config_set_string (const oconfig_item_t *ci, /* {{{ */
2843 char **ret_string)
2844 {
2845 char *tmp;
2846 if ((ci->values_num != 1)
2847 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2848 {
2849 WARNING ("network plugin: The `%s' config option needs exactly "
2850 "one string argument.", ci->key);
2851 return (-1);
2852 }
2854 tmp = strdup (ci->values[0].value.string);
2855 if (tmp == NULL)
2856 return (-1);
2858 sfree (*ret_string);
2859 *ret_string = tmp;
2861 return (0);
2862 } /* }}} int network_config_set_string */
2863 #endif /* HAVE_LIBGCRYPT */
2865 #if HAVE_LIBGCRYPT
2866 static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
2867 int *retval)
2868 {
2869 char *str;
2870 if ((ci->values_num != 1)
2871 || (ci->values[0].type != OCONFIG_TYPE_STRING))
2872 {
2873 WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
2874 "one string argument.");
2875 return (-1);
2876 }
2878 str = ci->values[0].value.string;
2879 if (strcasecmp ("Encrypt", str) == 0)
2880 *retval = SECURITY_LEVEL_ENCRYPT;
2881 else if (strcasecmp ("Sign", str) == 0)
2882 *retval = SECURITY_LEVEL_SIGN;
2883 else if (strcasecmp ("None", str) == 0)
2884 *retval = SECURITY_LEVEL_NONE;
2885 else
2886 {
2887 WARNING ("network plugin: Unknown security level: %s.", str);
2888 return (-1);
2889 }
2891 return (0);
2892 } /* }}} int network_config_set_security_level */
2893 #endif /* HAVE_LIBGCRYPT */
2895 static int network_config_add_listen (const oconfig_item_t *ci) /* {{{ */
2896 {
2897 sockent_t *se;
2898 int status;
2899 int i;
2901 if ((ci->values_num < 1) || (ci->values_num > 2)
2902 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2903 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2904 {
2905 ERROR ("network plugin: The `%s' config option needs "
2906 "one or two string arguments.", ci->key);
2907 return (-1);
2908 }
2910 se = malloc (sizeof (*se));
2911 if (se == NULL)
2912 {
2913 ERROR ("network plugin: malloc failed.");
2914 return (-1);
2915 }
2916 sockent_init (se, SOCKENT_TYPE_SERVER);
2918 se->node = strdup (ci->values[0].value.string);
2919 if (ci->values_num >= 2)
2920 se->service = strdup (ci->values[1].value.string);
2922 for (i = 0; i < ci->children_num; i++)
2923 {
2924 oconfig_item_t *child = ci->children + i;
2926 #if HAVE_LIBGCRYPT
2927 if (strcasecmp ("AuthFile", child->key) == 0)
2928 network_config_set_string (child, &se->data.server.auth_file);
2929 else if (strcasecmp ("SecurityLevel", child->key) == 0)
2930 network_config_set_security_level (child,
2931 &se->data.server.security_level);
2932 else
2933 #endif /* HAVE_LIBGCRYPT */
2934 if (strcasecmp ("Interface", child->key) == 0)
2935 network_config_set_interface (child,
2936 &se->interface);
2937 else
2938 {
2939 WARNING ("network plugin: Option `%s' is not allowed here.",
2940 child->key);
2941 }
2942 }
2944 #if HAVE_LIBGCRYPT
2945 if ((se->data.server.security_level > SECURITY_LEVEL_NONE)
2946 && (se->data.server.auth_file == NULL))
2947 {
2948 ERROR ("network plugin: A security level higher than `none' was "
2949 "requested, but no AuthFile option was given. Cowardly refusing to "
2950 "open this socket!");
2951 sockent_destroy (se);
2952 return (-1);
2953 }
2954 #endif /* HAVE_LIBGCRYPT */
2956 status = sockent_open (se);
2957 if (status != 0)
2958 {
2959 ERROR ("network plugin: network_config_add_listen: sockent_open failed.");
2960 sockent_destroy (se);
2961 return (-1);
2962 }
2964 status = sockent_add (se);
2965 if (status != 0)
2966 {
2967 ERROR ("network plugin: network_config_add_listen: sockent_add failed.");
2968 sockent_destroy (se);
2969 return (-1);
2970 }
2972 return (0);
2973 } /* }}} int network_config_add_listen */
2975 static int network_config_add_server (const oconfig_item_t *ci) /* {{{ */
2976 {
2977 sockent_t *se;
2978 int status;
2979 int i;
2981 if ((ci->values_num < 1) || (ci->values_num > 2)
2982 || (ci->values[0].type != OCONFIG_TYPE_STRING)
2983 || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
2984 {
2985 ERROR ("network plugin: The `%s' config option needs "
2986 "one or two string arguments.", ci->key);
2987 return (-1);
2988 }
2990 se = malloc (sizeof (*se));
2991 if (se == NULL)
2992 {
2993 ERROR ("network plugin: malloc failed.");
2994 return (-1);
2995 }
2996 sockent_init (se, SOCKENT_TYPE_CLIENT);
2998 se->node = strdup (ci->values[0].value.string);
2999 if (ci->values_num >= 2)
3000 se->service = strdup (ci->values[1].value.string);
3002 for (i = 0; i < ci->children_num; i++)
3003 {
3004 oconfig_item_t *child = ci->children + i;
3006 #if HAVE_LIBGCRYPT
3007 if (strcasecmp ("Username", child->key) == 0)
3008 network_config_set_string (child, &se->data.client.username);
3009 else if (strcasecmp ("Password", child->key) == 0)
3010 network_config_set_string (child, &se->data.client.password);
3011 else if (strcasecmp ("SecurityLevel", child->key) == 0)
3012 network_config_set_security_level (child,
3013 &se->data.client.security_level);
3014 else
3015 #endif /* HAVE_LIBGCRYPT */
3016 if (strcasecmp ("Interface", child->key) == 0)
3017 network_config_set_interface (child,
3018 &se->interface);
3019 else
3020 {
3021 WARNING ("network plugin: Option `%s' is not allowed here.",
3022 child->key);
3023 }
3024 }
3026 #if HAVE_LIBGCRYPT
3027 if ((se->data.client.security_level > SECURITY_LEVEL_NONE)
3028 && ((se->data.client.username == NULL)
3029 || (se->data.client.password == NULL)))
3030 {
3031 ERROR ("network plugin: A security level higher than `none' was "
3032 "requested, but no Username or Password option was given. "
3033 "Cowardly refusing to open this socket!");
3034 sockent_destroy (se);
3035 return (-1);
3036 }
3037 #endif /* HAVE_LIBGCRYPT */
3039 status = sockent_open (se);
3040 if (status != 0)
3041 {
3042 ERROR ("network plugin: network_config_add_server: sockent_open failed.");
3043 sockent_destroy (se);
3044 return (-1);
3045 }
3047 status = sockent_add (se);
3048 if (status != 0)
3049 {
3050 ERROR ("network plugin: network_config_add_server: sockent_add failed.");
3051 sockent_destroy (se);
3052 return (-1);
3053 }
3055 return (0);
3056 } /* }}} int network_config_add_server */
3058 static int network_config (oconfig_item_t *ci) /* {{{ */
3059 {
3060 int i;
3062 for (i = 0; i < ci->children_num; i++)
3063 {
3064 oconfig_item_t *child = ci->children + i;
3066 if (strcasecmp ("Listen", child->key) == 0)
3067 network_config_add_listen (child);
3068 else if (strcasecmp ("Server", child->key) == 0)
3069 network_config_add_server (child);
3070 else if (strcasecmp ("TimeToLive", child->key) == 0)
3071 network_config_set_ttl (child);
3072 else if (strcasecmp ("MaxPacketSize", child->key) == 0)
3073 network_config_set_buffer_size (child);
3074 else if (strcasecmp ("Forward", child->key) == 0)
3075 network_config_set_boolean (child, &network_config_forward);
3076 else if (strcasecmp ("ReportStats", child->key) == 0)
3077 network_config_set_boolean (child, &network_config_stats);
3078 else
3079 {
3080 WARNING ("network plugin: Option `%s' is not allowed here.",
3081 child->key);
3082 }
3083 }
3085 return (0);
3086 } /* }}} int network_config */
3088 static int network_notification (const notification_t *n,
3089 user_data_t __attribute__((unused)) *user_data)
3090 {
3091 char buffer[network_config_packet_size];
3092 char *buffer_ptr = buffer;
3093 int buffer_free = sizeof (buffer);
3094 int status;
3096 memset (buffer, '\0', sizeof (buffer));
3098 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME_HR,
3099 (uint64_t) n->time);
3100 if (status != 0)
3101 return (-1);
3103 status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
3104 (uint64_t) n->severity);
3105 if (status != 0)
3106 return (-1);
3108 if (strlen (n->host) > 0)
3109 {
3110 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
3111 n->host, strlen (n->host));
3112 if (status != 0)
3113 return (-1);
3114 }
3116 if (strlen (n->plugin) > 0)
3117 {
3118 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
3119 n->plugin, strlen (n->plugin));
3120 if (status != 0)
3121 return (-1);
3122 }
3124 if (strlen (n->plugin_instance) > 0)
3125 {
3126 status = write_part_string (&buffer_ptr, &buffer_free,
3127 TYPE_PLUGIN_INSTANCE,
3128 n->plugin_instance, strlen (n->plugin_instance));
3129 if (status != 0)
3130 return (-1);
3131 }
3133 if (strlen (n->type) > 0)
3134 {
3135 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
3136 n->type, strlen (n->type));
3137 if (status != 0)
3138 return (-1);
3139 }
3141 if (strlen (n->type_instance) > 0)
3142 {
3143 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
3144 n->type_instance, strlen (n->type_instance));
3145 if (status != 0)
3146 return (-1);
3147 }
3149 status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
3150 n->message, strlen (n->message));
3151 if (status != 0)
3152 return (-1);
3154 network_send_buffer (buffer, sizeof (buffer) - buffer_free);
3156 return (0);
3157 } /* int network_notification */
3159 static int network_shutdown (void)
3160 {
3161 listen_loop++;
3163 /* Kill the listening thread */
3164 if (receive_thread_running != 0)
3165 {
3166 INFO ("network plugin: Stopping receive thread.");
3167 pthread_kill (receive_thread_id, SIGTERM);
3168 pthread_join (receive_thread_id, NULL /* no return value */);
3169 memset (&receive_thread_id, 0, sizeof (receive_thread_id));
3170 receive_thread_running = 0;
3171 }
3173 /* Shutdown the dispatching thread */
3174 if (dispatch_thread_running != 0)
3175 {
3176 INFO ("network plugin: Stopping dispatch thread.");
3177 pthread_mutex_lock (&receive_list_lock);
3178 pthread_cond_broadcast (&receive_list_cond);
3179 pthread_mutex_unlock (&receive_list_lock);
3180 pthread_join (dispatch_thread_id, /* ret = */ NULL);
3181 dispatch_thread_running = 0;
3182 }
3184 sockent_destroy (listen_sockets);
3186 if (send_buffer_fill > 0)
3187 flush_buffer ();
3189 sfree (send_buffer);
3191 /* TODO: Close `sending_sockets' */
3193 plugin_unregister_config ("network");
3194 plugin_unregister_init ("network");
3195 plugin_unregister_write ("network");
3196 plugin_unregister_shutdown ("network");
3198 return (0);
3199 } /* int network_shutdown */
3201 static int network_stats_read (void) /* {{{ */
3202 {
3203 derive_t copy_octets_rx;
3204 derive_t copy_octets_tx;
3205 derive_t copy_packets_rx;
3206 derive_t copy_packets_tx;
3207 derive_t copy_values_dispatched;
3208 derive_t copy_values_not_dispatched;
3209 derive_t copy_values_sent;
3210 derive_t copy_values_not_sent;
3211 derive_t copy_receive_list_length;
3212 value_list_t vl = VALUE_LIST_INIT;
3213 value_t values[2];
3215 copy_octets_rx = stats_octets_rx;
3216 copy_octets_tx = stats_octets_tx;
3217 copy_packets_rx = stats_packets_rx;
3218 copy_packets_tx = stats_packets_tx;
3219 copy_values_dispatched = stats_values_dispatched;
3220 copy_values_not_dispatched = stats_values_not_dispatched;
3221 copy_values_sent = stats_values_sent;
3222 copy_values_not_sent = stats_values_not_sent;
3223 copy_receive_list_length = receive_list_length;
3225 /* Initialize `vl' */
3226 vl.values = values;
3227 vl.values_len = 2;
3228 vl.time = 0;
3229 vl.interval = interval_g;
3230 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
3231 sstrncpy (vl.plugin, "network", sizeof (vl.plugin));
3233 /* Octets received / sent */
3234 vl.values[0].derive = (derive_t) copy_octets_rx;
3235 vl.values[1].derive = (derive_t) copy_octets_tx;
3236 sstrncpy (vl.type, "if_octets", sizeof (vl.type));
3237 plugin_dispatch_values_secure (&vl);
3239 /* Packets received / send */
3240 vl.values[0].derive = (derive_t) copy_packets_rx;
3241 vl.values[1].derive = (derive_t) copy_packets_tx;
3242 sstrncpy (vl.type, "if_packets", sizeof (vl.type));
3243 plugin_dispatch_values_secure (&vl);
3245 /* Values (not) dispatched and (not) send */
3246 sstrncpy (vl.type, "total_values", sizeof (vl.type));
3247 vl.values_len = 1;
3249 vl.values[0].derive = (derive_t) copy_values_dispatched;
3250 sstrncpy (vl.type_instance, "dispatch-accepted",
3251 sizeof (vl.type_instance));
3252 plugin_dispatch_values_secure (&vl);
3254 vl.values[0].derive = (derive_t) copy_values_not_dispatched;
3255 sstrncpy (vl.type_instance, "dispatch-rejected",
3256 sizeof (vl.type_instance));
3257 plugin_dispatch_values_secure (&vl);
3259 vl.values[0].derive = (derive_t) copy_values_sent;
3260 sstrncpy (vl.type_instance, "send-accepted",
3261 sizeof (vl.type_instance));
3262 plugin_dispatch_values_secure (&vl);
3264 vl.values[0].derive = (derive_t) copy_values_not_sent;
3265 sstrncpy (vl.type_instance, "send-rejected",
3266 sizeof (vl.type_instance));
3267 plugin_dispatch_values_secure (&vl);
3269 /* Receive queue length */
3270 vl.values[0].gauge = (gauge_t) copy_receive_list_length;
3271 sstrncpy (vl.type, "queue_length", sizeof (vl.type));
3272 vl.type_instance[0] = 0;
3273 plugin_dispatch_values_secure (&vl);
3275 return (0);
3276 } /* }}} int network_stats_read */
3278 static int network_init (void)
3279 {
3280 static _Bool have_init = 0;
3282 /* Check if we were already initialized. If so, just return - there's
3283 * nothing more to do (for now, that is). */
3284 if (have_init)
3285 return (0);
3286 have_init = 1;
3288 #if HAVE_LIBGCRYPT
3289 gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
3290 gcry_control (GCRYCTL_INIT_SECMEM, 32768, 0);
3291 gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
3292 #endif
3294 if (network_config_stats != 0)
3295 plugin_register_read ("network", network_stats_read);
3297 plugin_register_shutdown ("network", network_shutdown);
3299 send_buffer = malloc (network_config_packet_size);
3300 if (send_buffer == NULL)
3301 {
3302 ERROR ("network plugin: malloc failed.");
3303 return (-1);
3304 }
3305 network_init_buffer ();
3307 /* setup socket(s) and so on */
3308 if (sending_sockets != NULL)
3309 {
3310 plugin_register_write ("network", network_write,
3311 /* user_data = */ NULL);
3312 plugin_register_notification ("network", network_notification,
3313 /* user_data = */ NULL);
3314 }
3316 /* If no threads need to be started, return here. */
3317 if ((listen_sockets_num == 0)
3318 || ((dispatch_thread_running != 0)
3319 && (receive_thread_running != 0)))
3320 return (0);
3322 if (dispatch_thread_running == 0)
3323 {
3324 int status;
3325 status = pthread_create (&dispatch_thread_id,
3326 NULL /* no attributes */,
3327 dispatch_thread,
3328 NULL /* no argument */);
3329 if (status != 0)
3330 {
3331 char errbuf[1024];
3332 ERROR ("network: pthread_create failed: %s",
3333 sstrerror (errno, errbuf,
3334 sizeof (errbuf)));
3335 }
3336 else
3337 {
3338 dispatch_thread_running = 1;
3339 }
3340 }
3342 if (receive_thread_running == 0)
3343 {
3344 int status;
3345 status = pthread_create (&receive_thread_id,
3346 NULL /* no attributes */,
3347 receive_thread,
3348 NULL /* no argument */);
3349 if (status != 0)
3350 {
3351 char errbuf[1024];
3352 ERROR ("network: pthread_create failed: %s",
3353 sstrerror (errno, errbuf,
3354 sizeof (errbuf)));
3355 }
3356 else
3357 {
3358 receive_thread_running = 1;
3359 }
3360 }
3362 return (0);
3363 } /* int network_init */
3365 /*
3366 * The flush option of the network plugin cannot flush individual identifiers.
3367 * All the values are added to a buffer and sent when the buffer is full, the
3368 * requested value may or may not be in there, it's not worth finding out. We
3369 * just send the buffer if `flush' is called - if the requested value was in
3370 * there, good. If not, well, then there is nothing to flush.. -octo
3371 */
3372 static int network_flush (__attribute__((unused)) cdtime_t timeout,
3373 __attribute__((unused)) const char *identifier,
3374 __attribute__((unused)) user_data_t *user_data)
3375 {
3376 pthread_mutex_lock (&send_buffer_lock);
3378 if (send_buffer_fill > 0)
3379 flush_buffer ();
3381 pthread_mutex_unlock (&send_buffer_lock);
3383 return (0);
3384 } /* int network_flush */
3386 void module_register (void)
3387 {
3388 plugin_register_complex_config ("network", network_config);
3389 plugin_register_init ("network", network_init);
3390 plugin_register_flush ("network", network_flush,
3391 /* user_data = */ NULL);
3392 } /* void module_register */
3394 /* vim: set fdm=marker : */