src/network.c

   1 /**
   2  * collectd - src/network.c
   3  * Copyright (C) 2005-2008  Florian octo Forster
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; only version 2 of the License is applicable.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  17  *
  18  * Authors:
  19  *   Florian octo Forster <octo at verplant.org>
  20  **/
  21
  22 #include "collectd.h"
  23 #include "plugin.h"
  24 #include "common.h"
  25 #include "configfile.h"
  26 #include "utils_avltree.h"
  27
  28 #include "network.h"
  29
  30 #if HAVE_PTHREAD_H
  31 # include <pthread.h>
  32 #endif
  33 #if HAVE_SYS_SOCKET_H
  34 # include <sys/socket.h>
  35 #endif
  36 #if HAVE_NETDB_H
  37 # include <netdb.h>
  38 #endif
  39 #if HAVE_NETINET_IN_H
  40 # include <netinet/in.h>
  41 #endif
  42 #if HAVE_ARPA_INET_H
  43 # include <arpa/inet.h>
  44 #endif
  45 #if HAVE_POLL_H
  46 # include <poll.h>
  47 #endif
  48
  49 /* 1500 - 40 - 8  =  Ethernet packet - IPv6 header - UDP header */
  50 /* #define BUFF_SIZE 1452 */
  51
  52 #ifndef IPV6_ADD_MEMBERSHIP
  53 # ifdef IPV6_JOIN_GROUP
  54 #  define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
  55 # else
  56 #  error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
  57 # endif
  58 #endif /* !IP_ADD_MEMBERSHIP */
  59
  60 #define BUFF_SIZE 1024
  61
  62 /*
  63  * Private data types
  64  */
  65 typedef struct sockent
  66 {
  67         int                      fd;
  68         struct sockaddr_storage *addr;
  69         socklen_t                addrlen;
  70         struct sockent          *next;
  71 } sockent_t;
  72
  73 /*                      1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
  74  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  75  * +-------+-----------------------+-------------------------------+
  76  * ! Ver.  !                       ! Length                        !
  77  * +-------+-----------------------+-------------------------------+
  78  */
  79 struct part_header_s
  80 {
  81         uint16_t type;
  82         uint16_t length;
  83 };
  84 typedef struct part_header_s part_header_t;
  85
  86 /*                      1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
  87  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  88  * +-------------------------------+-------------------------------+
  89  * ! Type                          ! Length                        !
  90  * +-------------------------------+-------------------------------+
  91  * : (Length - 4) Bytes                                            :
  92  * +---------------------------------------------------------------+
  93  */
  94 struct part_string_s
  95 {
  96         part_header_t *head;
  97         char *value;
  98 };
  99 typedef struct part_string_s part_string_t;
 100
 101 /*                      1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
 102  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 103  * +-------------------------------+-------------------------------+
 104  * ! Type                          ! Length                        !
 105  * +-------------------------------+-------------------------------+
 106  * : (Length - 4 == 2 || 4 || 8) Bytes                             :
 107  * +---------------------------------------------------------------+
 108  */
 109 struct part_number_s
 110 {
 111         part_header_t *head;
 112         uint64_t *value;
 113 };
 114 typedef struct part_number_s part_number_t;
 115
 116 /*                      1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
 117  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 118  * +-------------------------------+-------------------------------+
 119  * ! Type                          ! Length                        !
 120  * +-------------------------------+---------------+---------------+
 121  * ! Num of values                 ! Type0         ! Type1         !
 122  * +-------------------------------+---------------+---------------+
 123  * ! Value0                                                        !
 124  * !                                                               !
 125  * +---------------------------------------------------------------+
 126  * ! Value1                                                        !
 127  * !                                                               !
 128  * +---------------------------------------------------------------+
 129  */
 130 struct part_values_s
 131 {
 132         part_header_t *head;
 133         uint16_t *num_values;
 134         uint8_t  *values_types;
 135         value_t  *values;
 136 };
 137 typedef struct part_values_s part_values_t;
 138
 139 struct receive_list_entry_s
 140 {
 141   char data[BUFF_SIZE];
 142   int  data_len;
 143   struct receive_list_entry_s *next;
 144 };
 145 typedef struct receive_list_entry_s receive_list_entry_t;
 146
 147 /*
 148  * Private variables
 149  */
 150 static const char *config_keys[] =
 151 {
 152         "CacheFlush",
 153         "Listen",
 154         "Server",
 155         "TimeToLive",
 156         "Forward"
 157 };
 158 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
 159
 160 static int network_config_ttl = 0;
 161 static int network_config_forward = 0;
 162
 163 static sockent_t *sending_sockets = NULL;
 164
 165 static receive_list_entry_t *receive_list_head = NULL;
 166 static receive_list_entry_t *receive_list_tail = NULL;
 167 static pthread_mutex_t       receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
 168 static pthread_cond_t        receive_list_cond = PTHREAD_COND_INITIALIZER;
 169
 170 static struct pollfd *listen_sockets = NULL;
 171 static int listen_sockets_num = 0;
 172
 173 static int listen_loop = 0;
 174 static pthread_t receive_thread_id = 0;
 175 static pthread_t dispatch_thread_id = 0;
 176
 177 static char         send_buffer[BUFF_SIZE];
 178 static char        *send_buffer_ptr;
 179 static int          send_buffer_fill;
 180 static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
 181 static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
 182
 183 static c_avl_tree_t      *cache_tree = NULL;
 184 static pthread_mutex_t  cache_lock = PTHREAD_MUTEX_INITIALIZER;
 185 static time_t           cache_flush_last = 0;
 186 static int              cache_flush_interval = 1800;
 187
 188 /*
 189  * Private functions
 190  */
 191 static int cache_flush (void)
 192 {
 193         char **keys = NULL;
 194         int    keys_num = 0;
 195
 196         char **tmp;
 197         int    i;
 198
 199         char   *key;
 200         time_t *value;
 201         c_avl_iterator_t *iter;
 202
 203         time_t curtime = time (NULL);
 204
 205         iter = c_avl_get_iterator (cache_tree);
 206         while (c_avl_iterator_next (iter, (void *) &key, (void *) &value) == 0)
 207         {
 208                 if ((curtime - *value) <= cache_flush_interval)
 209                         continue;
 210                 tmp = (char **) realloc (keys,
 211                                 (keys_num + 1) * sizeof (char *));
 212                 if (tmp == NULL)
 213                 {
 214                         sfree (keys);
 215                         c_avl_iterator_destroy (iter);
 216                         ERROR ("network plugin: cache_flush: realloc"
 217                                         " failed.");
 218                         return (-1);
 219                 }
 220                 keys = tmp;
 221                 keys[keys_num] = key;
 222                 keys_num++;
 223         } /* while (c_avl_iterator_next) */
 224         c_avl_iterator_destroy (iter);
 225
 226         for (i = 0; i < keys_num; i++)
 227         {
 228                 if (c_avl_remove (cache_tree, keys[i], (void *) &key,
 229                                         (void *) &value) != 0)
 230                 {
 231                         WARNING ("network plugin: cache_flush: c_avl_remove"
 232                                         " (%s) failed.", keys[i]);
 233                         continue;
 234                 }
 235
 236                 sfree (key);
 237                 sfree (value);
 238         }
 239
 240         sfree (keys);
 241
 242         DEBUG ("network plugin: cache_flush: Removed %i %s",
 243                         keys_num, (keys_num == 1) ? "entry" : "entries");
 244         cache_flush_last = curtime;
 245         return (0);
 246 } /* int cache_flush */
 247
 248 static int cache_check (const value_list_t *vl)
 249 {
 250         char key[1024];
 251         time_t *value = NULL;
 252         int retval = -1;
 253
 254         if (cache_tree == NULL)
 255                 return (-1);
 256
 257         if (format_name (key, sizeof (key), vl->host, vl->plugin,
 258                                 vl->plugin_instance, vl->type, vl->type_instance))
 259                 return (-1);
 260
 261         pthread_mutex_lock (&cache_lock);
 262
 263         if (c_avl_get (cache_tree, key, (void *) &value) == 0)
 264         {
 265                 if (*value < vl->time)
 266                 {
 267                         *value = vl->time;
 268                         retval = 0;
 269                 }
 270                 else
 271                 {
 272                         DEBUG ("network plugin: cache_check: *value = %i >= vl->time = %i",
 273                                         (int) *value, (int) vl->time);
 274                         retval = 1;
 275                 }
 276         }
 277         else
 278         {
 279                 char *key_copy = strdup (key);
 280                 value = malloc (sizeof (time_t));
 281                 if ((key_copy != NULL) && (value != NULL))
 282                 {
 283                         *value = vl->time;
 284                         c_avl_insert (cache_tree, key_copy, value);
 285                         retval = 0;
 286                 }
 287                 else
 288                 {
 289                         sfree (key_copy);
 290                         sfree (value);
 291                 }
 292         }
 293
 294         if ((time (NULL) - cache_flush_last) > cache_flush_interval)
 295                 cache_flush ();
 296
 297         pthread_mutex_unlock (&cache_lock);
 298
 299         DEBUG ("network plugin: cache_check: key = %s; time = %i; retval = %i",
 300                         key, (int) vl->time, retval);
 301
 302         return (retval);
 303 } /* int cache_check */
 304
 305 static int write_part_values (char **ret_buffer, int *ret_buffer_len,
 306                 const data_set_t *ds, const value_list_t *vl)
 307 {
 308         char *packet_ptr;
 309         int packet_len;
 310         int num_values;
 311
 312         part_header_t pkg_ph;
 313         uint16_t      pkg_num_values;
 314         uint8_t      *pkg_values_types;
 315         value_t      *pkg_values;
 316
 317         int offset;
 318         int i;
 319
 320         num_values = vl->values_len;
 321         packet_len = sizeof (part_header_t) + sizeof (uint16_t)
 322                 + (num_values * sizeof (uint8_t))
 323                 + (num_values * sizeof (value_t));
 324
 325         if (*ret_buffer_len < packet_len)
 326                 return (-1);
 327
 328         pkg_values_types = (uint8_t *) malloc (num_values * sizeof (uint8_t));
 329         if (pkg_values_types == NULL)
 330         {
 331                 ERROR ("network plugin: write_part_values: malloc failed.");
 332                 return (-1);
 333         }
 334
 335         pkg_values = (value_t *) malloc (num_values * sizeof (value_t));
 336         if (pkg_values == NULL)
 337         {
 338                 free (pkg_values_types);
 339                 ERROR ("network plugin: write_part_values: malloc failed.");
 340                 return (-1);
 341         }
 342
 343         pkg_ph.type = htons (TYPE_VALUES);
 344         pkg_ph.length = htons (packet_len);
 345
 346         pkg_num_values = htons ((uint16_t) vl->values_len);
 347
 348         for (i = 0; i < num_values; i++)
 349         {
 350                 if (ds->ds[i].type == DS_TYPE_COUNTER)
 351                 {
 352                         pkg_values_types[i] = DS_TYPE_COUNTER;
 353                         pkg_values[i].counter = htonll (vl->values[i].counter);
 354                 }
 355                 else
 356                 {
 357                         pkg_values_types[i] = DS_TYPE_GAUGE;
 358                         pkg_values[i].gauge = htond (vl->values[i].gauge);
 359                 }
 360         }
 361
 362         /*
 363          * Use `memcpy' to write everything to the buffer, because the pointer
 364          * may be unaligned and some architectures, such as SPARC, can't handle
 365          * that.
 366          */
 367         packet_ptr = *ret_buffer;
 368         offset = 0;
 369         memcpy (packet_ptr + offset, &pkg_ph, sizeof (pkg_ph));
 370         offset += sizeof (pkg_ph);
 371         memcpy (packet_ptr + offset, &pkg_num_values, sizeof (pkg_num_values));
 372         offset += sizeof (pkg_num_values);
 373         memcpy (packet_ptr + offset, pkg_values_types, num_values * sizeof (uint8_t));
 374         offset += num_values * sizeof (uint8_t);
 375         memcpy (packet_ptr + offset, pkg_values, num_values * sizeof (value_t));
 376         offset += num_values * sizeof (value_t);
 377
 378         assert (offset == packet_len);
 379
 380         *ret_buffer = packet_ptr + packet_len;
 381         *ret_buffer_len -= packet_len;
 382
 383         free (pkg_values_types);
 384         free (pkg_values);
 385
 386         return (0);
 387 } /* int write_part_values */
 388
 389 static int write_part_number (char **ret_buffer, int *ret_buffer_len,
 390                 int type, uint64_t value)
 391 {
 392         char *packet_ptr;
 393         int packet_len;
 394
 395         part_header_t pkg_head;
 396         uint64_t pkg_value;
 397
 398         int offset;
 399
 400         packet_len = sizeof (pkg_head) + sizeof (pkg_value);
 401
 402         if (*ret_buffer_len < packet_len)
 403                 return (-1);
 404
 405         pkg_head.type = htons (type);
 406         pkg_head.length = htons (packet_len);
 407         pkg_value = htonll (value);
 408
 409         packet_ptr = *ret_buffer;
 410         offset = 0;
 411         memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
 412         offset += sizeof (pkg_head);
 413         memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
 414         offset += sizeof (pkg_value);
 415
 416         assert (offset == packet_len);
 417
 418         *ret_buffer = packet_ptr + packet_len;
 419         *ret_buffer_len -= packet_len;
 420
 421         return (0);
 422 } /* int write_part_number */
 423
 424 static int write_part_string (char **ret_buffer, int *ret_buffer_len,
 425                 int type, const char *str, int str_len)
 426 {
 427         char *buffer;
 428         int buffer_len;
 429
 430         uint16_t pkg_type;
 431         uint16_t pkg_length;
 432
 433         int offset;
 434
 435         buffer_len = 2 * sizeof (uint16_t) + str_len + 1;
 436         if (*ret_buffer_len < buffer_len)
 437                 return (-1);
 438
 439         pkg_type = htons (type);
 440         pkg_length = htons (buffer_len);
 441
 442         buffer = *ret_buffer;
 443         offset = 0;
 444         memcpy (buffer + offset, (void *) &pkg_type, sizeof (pkg_type));
 445         offset += sizeof (pkg_type);
 446         memcpy (buffer + offset, (void *) &pkg_length, sizeof (pkg_length));
 447         offset += sizeof (pkg_length);
 448         memcpy (buffer + offset, str, str_len);
 449         offset += str_len;
 450         memset (buffer + offset, '\0', 1);
 451         offset += 1;
 452
 453         assert (offset == buffer_len);
 454
 455         *ret_buffer = buffer + buffer_len;
 456         *ret_buffer_len -= buffer_len;
 457
 458         return (0);
 459 } /* int write_part_string */
 460
 461 static int parse_part_values (void **ret_buffer, int *ret_buffer_len,
 462                 value_t **ret_values, int *ret_num_values)
 463 {
 464         char *buffer = *ret_buffer;
 465         int   buffer_len = *ret_buffer_len;
 466
 467         uint16_t tmp16;
 468         size_t exp_size;
 469         int   i;
 470
 471         uint16_t pkg_length;
 472         uint16_t pkg_type;
 473         uint16_t pkg_numval;
 474
 475         uint8_t *pkg_types;
 476         value_t *pkg_values;
 477
 478         if (buffer_len < (15))
 479         {
 480                 DEBUG ("network plugin: packet is too short: buffer_len = %i",
 481                                 buffer_len);
 482                 return (-1);
 483         }
 484
 485         memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
 486         buffer += sizeof (tmp16);
 487         pkg_type = ntohs (tmp16);
 488
 489         memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
 490         buffer += sizeof (tmp16);
 491         pkg_length = ntohs (tmp16);
 492
 493         memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
 494         buffer += sizeof (tmp16);
 495         pkg_numval = ntohs (tmp16);
 496
 497         assert (pkg_type == TYPE_VALUES);
 498
 499         exp_size = 3 * sizeof (uint16_t)
 500                 + pkg_numval * (sizeof (uint8_t) + sizeof (value_t));
 501         if (buffer_len < exp_size)
 502         {
 503                 WARNING ("network plugin: parse_part_values: "
 504                                 "Packet too short: "
 505                                 "Chunk of size %u expected, "
 506                                 "but buffer has only %i bytes left.",
 507                                 (unsigned int) exp_size, buffer_len);
 508                 return (-1);
 509         }
 510
 511         if (pkg_length != exp_size)
 512         {
 513                 WARNING ("network plugin: parse_part_values: "
 514                                 "Length and number of values "
 515                                 "in the packet don't match.");
 516                 return (-1);
 517         }
 518
 519         pkg_types = (uint8_t *) malloc (pkg_numval * sizeof (uint8_t));
 520         pkg_values = (value_t *) malloc (pkg_numval * sizeof (value_t));
 521         if ((pkg_types == NULL) || (pkg_values == NULL))
 522         {
 523                 sfree (pkg_types);
 524                 sfree (pkg_values);
 525                 ERROR ("network plugin: parse_part_values: malloc failed.");
 526                 return (-1);
 527         }
 528
 529         memcpy ((void *) pkg_types, (void *) buffer, pkg_numval * sizeof (uint8_t));
 530         buffer += pkg_numval * sizeof (uint8_t);
 531         memcpy ((void *) pkg_values, (void *) buffer, pkg_numval * sizeof (value_t));
 532         buffer += pkg_numval * sizeof (value_t);
 533
 534         for (i = 0; i < pkg_numval; i++)
 535         {
 536                 if (pkg_types[i] == DS_TYPE_COUNTER)
 537                         pkg_values[i].counter = ntohll (pkg_values[i].counter);
 538                 else if (pkg_types[i] == DS_TYPE_GAUGE)
 539                         pkg_values[i].gauge = ntohd (pkg_values[i].gauge);
 540         }
 541
 542         *ret_buffer     = buffer;
 543         *ret_buffer_len = buffer_len - pkg_length;
 544         *ret_num_values = pkg_numval;
 545         *ret_values     = pkg_values;
 546
 547         sfree (pkg_types);
 548
 549         return (0);
 550 } /* int parse_part_values */
 551
 552 static int parse_part_number (void **ret_buffer, int *ret_buffer_len,
 553                 uint64_t *value)
 554 {
 555         char *buffer = *ret_buffer;
 556         int buffer_len = *ret_buffer_len;
 557
 558         uint16_t tmp16;
 559         uint64_t tmp64;
 560         size_t exp_size = 2 * sizeof (uint16_t) + sizeof (uint64_t);
 561
 562         uint16_t pkg_length;
 563         uint16_t pkg_type;
 564
 565         if (buffer_len < exp_size)
 566         {
 567                 WARNING ("network plugin: parse_part_number: "
 568                                 "Packet too short: "
 569                                 "Chunk of size %u expected, "
 570                                 "but buffer has only %i bytes left.",
 571                                 (unsigned int) exp_size, buffer_len);
 572                 return (-1);
 573         }
 574
 575         memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
 576         buffer += sizeof (tmp16);
 577         pkg_type = ntohs (tmp16);
 578
 579         memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
 580         buffer += sizeof (tmp16);
 581         pkg_length = ntohs (tmp16);
 582
 583         memcpy ((void *) &tmp64, buffer, sizeof (tmp64));
 584         buffer += sizeof (tmp64);
 585         *value = ntohll (tmp64);
 586
 587         *ret_buffer = buffer;
 588         *ret_buffer_len = buffer_len - pkg_length;
 589
 590         return (0);
 591 } /* int parse_part_number */
 592
 593 static int parse_part_string (void **ret_buffer, int *ret_buffer_len,
 594                 char *output, int output_len)
 595 {
 596         char *buffer = *ret_buffer;
 597         int   buffer_len = *ret_buffer_len;
 598
 599         uint16_t tmp16;
 600         size_t header_size = 2 * sizeof (uint16_t);
 601
 602         uint16_t pkg_length;
 603         uint16_t pkg_type;
 604
 605         if (buffer_len < header_size)
 606         {
 607                 WARNING ("network plugin: parse_part_string: "
 608                                 "Packet too short: "
 609                                 "Chunk of at least size %u expected, "
 610                                 "but buffer has only %i bytes left.",
 611                                 (unsigned int) header_size, buffer_len);
 612                 return (-1);
 613         }
 614
 615         memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
 616         buffer += sizeof (tmp16);
 617         pkg_type = ntohs (tmp16);
 618
 619         memcpy ((void *) &tmp16, buffer, sizeof (tmp16));
 620         buffer += sizeof (tmp16);
 621         pkg_length = ntohs (tmp16);
 622
 623         /* Check that packet fits in the input buffer */
 624         if (pkg_length > buffer_len)
 625         {
 626                 WARNING ("network plugin: parse_part_string: "
 627                                 "Packet too big: "
 628                                 "Chunk of size %hu received, "
 629                                 "but buffer has only %i bytes left.",
 630                                 pkg_length, buffer_len);
 631                 return (-1);
 632         }
 633
 634         /* Check that pkg_length is in the valid range */
 635         if (pkg_length <= header_size)
 636         {
 637                 WARNING ("network plugin: parse_part_string: "
 638                                 "Packet too short: "
 639                                 "Header claims this packet is only %hu "
 640                                 "bytes long.", pkg_length);
 641                 return (-1);
 642         }
 643
 644         /* Check that the package data fits into the output buffer.
 645          * The previous if-statement ensures that:
 646          * `pkg_length > header_size' */
 647         if ((pkg_length - header_size) > output_len)
 648         {
 649                 WARNING ("network plugin: parse_part_string: "
 650                                 "Output buffer too small.");
 651                 return (-1);
 652         }
 653
 654         /* All sanity checks successfull, let's copy the data over */
 655         output_len = pkg_length - header_size;
 656         memcpy ((void *) output, (void *) buffer, output_len);
 657         buffer += output_len;
 658
 659         /* For some very weird reason '\0' doesn't do the trick on SPARC in
 660          * this statement. */
 661         if (output[output_len - 1] != 0)
 662         {
 663                 WARNING ("network plugin: parse_part_string: "
 664                                 "Received string does not end "
 665                                 "with a NULL-byte.");
 666                 return (-1);
 667         }
 668
 669         *ret_buffer = buffer;
 670         *ret_buffer_len = buffer_len - pkg_length;
 671
 672         return (0);
 673 } /* int parse_part_string */
 674
 675 static int parse_packet (void *buffer, int buffer_len)
 676 {
 677         int status;
 678
 679         value_list_t vl = VALUE_LIST_INIT;
 680         notification_t n;
 681
 682         DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
 683                         buffer, buffer_len);
 684
 685         memset (&vl, '\0', sizeof (vl));
 686         memset (&n, '\0', sizeof (n));
 687         status = 0;
 688
 689         while ((status == 0) && (0 < buffer_len)
 690                         && ((unsigned int) buffer_len > sizeof (part_header_t)))
 691         {
 692                 uint16_t pkg_length;
 693                 uint16_t pkg_type;
 694
 695                 memcpy ((void *) &pkg_type,
 696                                 (void *) buffer,
 697                                 sizeof (pkg_type));
 698                 memcpy ((void *) &pkg_length,
 699                                 (void *) (buffer + sizeof (pkg_type)),
 700                                 sizeof (pkg_length));
 701
 702                 pkg_length = ntohs (pkg_length);
 703                 pkg_type = ntohs (pkg_type);
 704
 705                 if (pkg_length > buffer_len)
 706                         break;
 707                 /* Ensure that this loop terminates eventually */
 708                 if (pkg_length < (2 * sizeof (uint16_t)))
 709                         break;
 710
 711                 if (pkg_type == TYPE_VALUES)
 712                 {
 713                         status = parse_part_values (&buffer, &buffer_len,
 714                                         &vl.values, &vl.values_len);
 715
 716                         if (status != 0)
 717                                 break;
 718
 719                         if ((vl.time > 0)
 720                                         && (strlen (vl.host) > 0)
 721                                         && (strlen (vl.plugin) > 0)
 722                                         && (strlen (vl.type) > 0)
 723                                         && (cache_check (&vl) == 0))
 724                         {
 725                                 plugin_dispatch_values (&vl);
 726                         }
 727                         else
 728                         {
 729                                 DEBUG ("network plugin: parse_packet:"
 730                                                 " NOT dispatching values");
 731                         }
 732
 733                         sfree (vl.values);
 734                 }
 735                 else if (pkg_type == TYPE_TIME)
 736                 {
 737                         uint64_t tmp = 0;
 738                         status = parse_part_number (&buffer, &buffer_len,
 739                                         &tmp);
 740                         if (status == 0)
 741                         {
 742                                 vl.time = (time_t) tmp;
 743                                 n.time = (time_t) tmp;
 744                         }
 745                 }
 746                 else if (pkg_type == TYPE_INTERVAL)
 747                 {
 748                         uint64_t tmp = 0;
 749                         status = parse_part_number (&buffer, &buffer_len,
 750                                         &tmp);
 751                         if (status == 0)
 752                                 vl.interval = (int) tmp;
 753                 }
 754                 else if (pkg_type == TYPE_HOST)
 755                 {
 756                         status = parse_part_string (&buffer, &buffer_len,
 757                                         vl.host, sizeof (vl.host));
 758                         if (status == 0)
 759                                 sstrncpy (n.host, vl.host, sizeof (n.host));
 760                 }
 761                 else if (pkg_type == TYPE_PLUGIN)
 762                 {
 763                         status = parse_part_string (&buffer, &buffer_len,
 764                                         vl.plugin, sizeof (vl.plugin));
 765                         if (status == 0)
 766                                 sstrncpy (n.plugin, vl.plugin,
 767                                                 sizeof (n.plugin));
 768                 }
 769                 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
 770                 {
 771                         status = parse_part_string (&buffer, &buffer_len,
 772                                         vl.plugin_instance,
 773                                         sizeof (vl.plugin_instance));
 774                         if (status == 0)
 775                                 sstrncpy (n.plugin_instance,
 776                                                 vl.plugin_instance,
 777                                                 sizeof (n.plugin_instance));
 778                 }
 779                 else if (pkg_type == TYPE_TYPE)
 780                 {
 781                         status = parse_part_string (&buffer, &buffer_len,
 782                                         vl.type, sizeof (vl.type));
 783                         if (status == 0)
 784                                 sstrncpy (n.type, vl.type, sizeof (n.type));
 785                 }
 786                 else if (pkg_type == TYPE_TYPE_INSTANCE)
 787                 {
 788                         status = parse_part_string (&buffer, &buffer_len,
 789                                         vl.type_instance,
 790                                         sizeof (vl.type_instance));
 791                         if (status == 0)
 792                                 sstrncpy (n.type_instance, vl.type_instance,
 793                                                 sizeof (n.type_instance));
 794                 }
 795                 else if (pkg_type == TYPE_MESSAGE)
 796                 {
 797                         status = parse_part_string (&buffer, &buffer_len,
 798                                         n.message, sizeof (n.message));
 799
 800                         if (status != 0)
 801                         {
 802                                 /* do nothing */
 803                         }
 804                         else if ((n.severity != NOTIF_FAILURE)
 805                                         && (n.severity != NOTIF_WARNING)
 806                                         && (n.severity != NOTIF_OKAY))
 807                         {
 808                                 INFO ("network plugin: "
 809                                                 "Ignoring notification with "
 810                                                 "unknown severity %i.",
 811                                                 n.severity);
 812                         }
 813                         else if (n.time <= 0)
 814                         {
 815                                 INFO ("network plugin: "
 816                                                 "Ignoring notification with "
 817                                                 "time == 0.");
 818                         }
 819                         else if (strlen (n.message) <= 0)
 820                         {
 821                                 INFO ("network plugin: "
 822                                                 "Ignoring notification with "
 823                                                 "an empty message.");
 824                         }
 825                         else
 826                         {
 827                                 plugin_dispatch_notification (&n);
 828                         }
 829                 }
 830                 else if (pkg_type == TYPE_SEVERITY)
 831                 {
 832                         uint64_t tmp = 0;
 833                         status = parse_part_number (&buffer, &buffer_len,
 834                                         &tmp);
 835                         if (status == 0)
 836                                 n.severity = (int) tmp;
 837                 }
 838                 else
 839                 {
 840                         DEBUG ("network plugin: parse_packet: Unknown part"
 841                                         " type: 0x%04hx", pkg_type);
 842                         buffer = ((char *) buffer) + pkg_length;
 843                 }
 844         } /* while (buffer_len > sizeof (part_header_t)) */
 845
 846         return (status);
 847 } /* int parse_packet */
 848
 849 static void free_sockent (sockent_t *se)
 850 {
 851         sockent_t *next;
 852         while (se != NULL)
 853         {
 854                 next = se->next;
 855                 free (se->addr);
 856                 free (se);
 857                 se = next;
 858         }
 859 } /* void free_sockent */
 860
 861 /*
 862  * int network_set_ttl
 863  *
 864  * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
 865  * `IPV6_UNICAST_HOPS', depending on which option is applicable.
 866  *
 867  * The `struct addrinfo' is used to destinguish between unicast and multicast
 868  * sockets.
 869  */
 870 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
 871 {
 872         if ((network_config_ttl < 1) || (network_config_ttl > 255))
 873                 return (-1);
 874
 875         DEBUG ("ttl = %i", network_config_ttl);
 876
 877         if (ai->ai_family == AF_INET)
 878         {
 879                 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
 880                 int optname;
 881
 882                 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
 883                         optname = IP_MULTICAST_TTL;
 884                 else
 885                         optname = IP_TTL;
 886
 887                 if (setsockopt (se->fd, IPPROTO_IP, optname,
 888                                         &network_config_ttl,
 889                                         sizeof (network_config_ttl)) == -1)
 890                 {
 891                         char errbuf[1024];
 892                         ERROR ("setsockopt: %s",
 893                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 894                         return (-1);
 895                 }
 896         }
 897         else if (ai->ai_family == AF_INET6)
 898         {
 899                 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
 900                 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
 901                 int optname;
 902
 903                 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
 904                         optname = IPV6_MULTICAST_HOPS;
 905                 else
 906                         optname = IPV6_UNICAST_HOPS;
 907
 908                 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
 909                                         &network_config_ttl,
 910                                         sizeof (network_config_ttl)) == -1)
 911                 {
 912                         char errbuf[1024];
 913                         ERROR ("setsockopt: %s",
 914                                         sstrerror (errno, errbuf,
 915                                                 sizeof (errbuf)));
 916                         return (-1);
 917                 }
 918         }
 919
 920         return (0);
 921 } /* int network_set_ttl */
 922
 923 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
 924 {
 925         int loop = 0;
 926         int yes  = 1;
 927
 928         /* allow multiple sockets to use the same PORT number */
 929         if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR,
 930                                 &yes, sizeof(yes)) == -1) {
 931                 char errbuf[1024];
 932                 ERROR ("setsockopt: %s",
 933                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 934                 return (-1);
 935         }
 936
 937         DEBUG ("fd = %i; calling `bind'", se->fd);
 938
 939         if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
 940         {
 941                 char errbuf[1024];
 942                 ERROR ("bind: %s",
 943                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 944                 return (-1);
 945         }
 946
 947         if (ai->ai_family == AF_INET)
 948         {
 949                 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
 950                 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
 951                 {
 952                         struct ip_mreq mreq;
 953
 954                         DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
 955
 956                         mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
 957                         mreq.imr_interface.s_addr = htonl (INADDR_ANY);
 958
 959                         if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
 960                                                 &loop, sizeof (loop)) == -1)
 961                         {
 962                                 char errbuf[1024];
 963                                 ERROR ("setsockopt: %s",
 964                                                 sstrerror (errno, errbuf,
 965                                                         sizeof (errbuf)));
 966                                 return (-1);
 967                         }
 968
 969                         if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 970                                                 &mreq, sizeof (mreq)) == -1)
 971                         {
 972                                 char errbuf[1024];
 973                                 ERROR ("setsockopt: %s",
 974                                                 sstrerror (errno, errbuf,
 975                                                         sizeof (errbuf)));
 976                                 return (-1);
 977                         }
 978                 }
 979         }
 980         else if (ai->ai_family == AF_INET6)
 981         {
 982                 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
 983                 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
 984                 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
 985                 {
 986                         struct ipv6_mreq mreq;
 987
 988                         DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
 989
 990                         memcpy (&mreq.ipv6mr_multiaddr,
 991                                         &addr->sin6_addr,
 992                                         sizeof (addr->sin6_addr));
 993
 994                         /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
 995                          * ipv6mr_interface may be set to zeroes to
 996                          * choose the default multicast interface or to
 997                          * the index of a particular multicast-capable
 998                          * interface if the host is multihomed.
 999                          * Membership is associ-associated with a
1000                          * single interface; programs running on
1001                          * multihomed hosts may need to join the same
1002                          * group on more than one interface.*/
1003                         mreq.ipv6mr_interface = 0;
1004
1005                         if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1006                                                 &loop, sizeof (loop)) == -1)
1007                         {
1008                                 char errbuf[1024];
1009                                 ERROR ("setsockopt: %s",
1010                                                 sstrerror (errno, errbuf,
1011                                                         sizeof (errbuf)));
1012                                 return (-1);
1013                         }
1014
1015                         if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1016                                                 &mreq, sizeof (mreq)) == -1)
1017                         {
1018                                 char errbuf[1024];
1019                                 ERROR ("setsockopt: %s",
1020                                                 sstrerror (errno, errbuf,
1021                                                         sizeof (errbuf)));
1022                                 return (-1);
1023                         }
1024                 }
1025         }
1026
1027         return (0);
1028 } /* int network_bind_socket */
1029
1030 static sockent_t *network_create_socket (const char *node,
1031                 const char *service,
1032                 int listen)
1033 {
1034         struct addrinfo  ai_hints;
1035         struct addrinfo *ai_list, *ai_ptr;
1036         int              ai_return;
1037
1038         sockent_t *se_head = NULL;
1039         sockent_t *se_tail = NULL;
1040
1041         DEBUG ("node = %s, service = %s", node, service);
1042
1043         memset (&ai_hints, '\0', sizeof (ai_hints));
1044         ai_hints.ai_flags    = 0;
1045 #ifdef AI_PASSIVE
1046         ai_hints.ai_flags |= AI_PASSIVE;
1047 #endif
1048 #ifdef AI_ADDRCONFIG
1049         ai_hints.ai_flags |= AI_ADDRCONFIG;
1050 #endif
1051         ai_hints.ai_family   = AF_UNSPEC;
1052         ai_hints.ai_socktype = SOCK_DGRAM;
1053         ai_hints.ai_protocol = IPPROTO_UDP;
1054
1055         ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1056         if (ai_return != 0)
1057         {
1058                 char errbuf[1024];
1059                 ERROR ("getaddrinfo (%s, %s): %s",
1060                                 (node == NULL) ? "(null)" : node,
1061                                 (service == NULL) ? "(null)" : service,
1062                                 (ai_return == EAI_SYSTEM)
1063                                 ? sstrerror (errno, errbuf, sizeof (errbuf))
1064                                 : gai_strerror (ai_return));
1065                 return (NULL);
1066         }
1067
1068         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1069         {
1070                 sockent_t *se;
1071
1072                 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
1073                 {
1074                         char errbuf[1024];
1075                         ERROR ("malloc: %s",
1076                                         sstrerror (errno, errbuf,
1077                                                 sizeof (errbuf)));
1078                         continue;
1079                 }
1080
1081                 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
1082                 {
1083                         char errbuf[1024];
1084                         ERROR ("malloc: %s",
1085                                         sstrerror (errno, errbuf,
1086                                                 sizeof (errbuf)));
1087                         free (se);
1088                         continue;
1089                 }
1090
1091                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1092                 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
1093                 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1094                 se->addrlen = ai_ptr->ai_addrlen;
1095
1096                 se->fd   = socket (ai_ptr->ai_family,
1097                                 ai_ptr->ai_socktype,
1098                                 ai_ptr->ai_protocol);
1099                 se->next = NULL;
1100
1101                 if (se->fd == -1)
1102                 {
1103                         char errbuf[1024];
1104                         ERROR ("socket: %s",
1105                                         sstrerror (errno, errbuf,
1106                                                 sizeof (errbuf)));
1107                         free (se->addr);
1108                         free (se);
1109                         continue;
1110                 }
1111
1112                 if (listen != 0)
1113                 {
1114                         if (network_bind_socket (se, ai_ptr) != 0)
1115                         {
1116                                 close (se->fd);
1117                                 free (se->addr);
1118                                 free (se);
1119                                 continue;
1120                         }
1121                 }
1122                 else /* listen == 0 */
1123                 {
1124                         network_set_ttl (se, ai_ptr);
1125                 }
1126
1127                 if (se_tail == NULL)
1128                 {
1129                         se_head = se;
1130                         se_tail = se;
1131                 }
1132                 else
1133                 {
1134                         se_tail->next = se;
1135                         se_tail = se;
1136                 }
1137
1138                 /* We don't open more than one write-socket per node/service pair.. */
1139                 if (listen == 0)
1140                         break;
1141         }
1142
1143         freeaddrinfo (ai_list);
1144
1145         return (se_head);
1146 } /* sockent_t *network_create_socket */
1147
1148 static sockent_t *network_create_default_socket (int listen)
1149 {
1150         sockent_t *se_ptr  = NULL;
1151         sockent_t *se_head = NULL;
1152         sockent_t *se_tail = NULL;
1153
1154         se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
1155                         NET_DEFAULT_PORT, listen);
1156
1157         /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
1158         if ((listen == 0) && (se_ptr != NULL))
1159                 return (se_ptr);
1160
1161         if (se_ptr != NULL)
1162         {
1163                 se_head = se_ptr;
1164                 se_tail = se_ptr;
1165                 while (se_tail->next != NULL)
1166                         se_tail = se_tail->next;
1167         }
1168
1169         se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
1170
1171         if (se_tail == NULL)
1172                 return (se_ptr);
1173
1174         se_tail->next = se_ptr;
1175         return (se_head);
1176 } /* sockent_t *network_create_default_socket */
1177
1178 static int network_add_listen_socket (const char *node, const char *service)
1179 {
1180         sockent_t *se;
1181         sockent_t *se_ptr;
1182         int se_num = 0;
1183
1184         if (service == NULL)
1185                 service = NET_DEFAULT_PORT;
1186
1187         if (node == NULL)
1188                 se = network_create_default_socket (1 /* listen == true */);
1189         else
1190                 se = network_create_socket (node, service, 1 /* listen == true */);
1191
1192         if (se == NULL)
1193                 return (-1);
1194
1195         for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1196                 se_num++;
1197
1198         listen_sockets = (struct pollfd *) realloc (listen_sockets,
1199                         (listen_sockets_num + se_num)
1200                         * sizeof (struct pollfd));
1201
1202         for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1203         {
1204                 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
1205                 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
1206                 listen_sockets[listen_sockets_num].revents = 0;
1207                 listen_sockets_num++;
1208         } /* for (se) */
1209
1210         free_sockent (se);
1211         return (0);
1212 } /* int network_add_listen_socket */
1213
1214 static int network_add_sending_socket (const char *node, const char *service)
1215 {
1216         sockent_t *se;
1217         sockent_t *se_ptr;
1218
1219         if (service == NULL)
1220                 service = NET_DEFAULT_PORT;
1221
1222         if (node == NULL)
1223                 se = network_create_default_socket (0 /* listen == false */);
1224         else
1225                 se = network_create_socket (node, service, 0 /* listen == false */);
1226
1227         if (se == NULL)
1228                 return (-1);
1229
1230         if (sending_sockets == NULL)
1231         {
1232                 sending_sockets = se;
1233                 return (0);
1234         }
1235
1236         for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
1237                 /* seek end */;
1238
1239         se_ptr->next = se;
1240         return (0);
1241 } /* int network_get_listen_socket */
1242
1243 static void *dispatch_thread (void *arg)
1244 {
1245   while (42)
1246   {
1247     receive_list_entry_t *ent;
1248
1249     /* Lock and wait for more data to come in */
1250     pthread_mutex_lock (&receive_list_lock);
1251     while ((listen_loop == 0)
1252         && (receive_list_head == NULL))
1253       pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1254
1255     /* Remove the head entry and unlock */
1256     ent = receive_list_head;
1257     if (ent != NULL)
1258       receive_list_head = ent->next;
1259     pthread_mutex_unlock (&receive_list_lock);
1260
1261     /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1262      * because we dispatch all missing packets before shutting down. */
1263     if (ent == NULL)
1264       break;
1265
1266     parse_packet (ent->data, ent->data_len);
1267
1268     sfree (ent);
1269   } /* while (42) */
1270
1271   return (NULL);
1272 } /* void *receive_thread */
1273
1274 static int network_receive (void)
1275 {
1276         char buffer[BUFF_SIZE];
1277         int  buffer_len;
1278
1279         int i;
1280         int status;
1281
1282         receive_list_entry_t *private_list_head;
1283         receive_list_entry_t *private_list_tail;
1284
1285         if (listen_sockets_num == 0)
1286                 network_add_listen_socket (NULL, NULL);
1287
1288         if (listen_sockets_num == 0)
1289         {
1290                 ERROR ("network: Failed to open a listening socket.");
1291                 return (-1);
1292         }
1293
1294         private_list_head = NULL;
1295         private_list_tail = NULL;
1296
1297         while (listen_loop == 0)
1298         {
1299                 status = poll (listen_sockets, listen_sockets_num, -1);
1300
1301                 if (status <= 0)
1302                 {
1303                         char errbuf[1024];
1304                         if (errno == EINTR)
1305                                 continue;
1306                         ERROR ("poll failed: %s",
1307                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1308                         return (-1);
1309                 }
1310
1311                 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1312                 {
1313                         receive_list_entry_t *ent;
1314
1315                         if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1316                                 continue;
1317                         status--;
1318
1319                         buffer_len = recv (listen_sockets[i].fd,
1320                                         buffer, sizeof (buffer),
1321                                         0 /* no flags */);
1322                         if (buffer_len < 0)
1323                         {
1324                                 char errbuf[1024];
1325                                 ERROR ("recv failed: %s",
1326                                                 sstrerror (errno, errbuf,
1327                                                         sizeof (errbuf)));
1328                                 return (-1);
1329                         }
1330
1331                         ent = malloc (sizeof (receive_list_entry_t));
1332                         if (ent == NULL)
1333                         {
1334                                 ERROR ("network plugin: malloc failed.");
1335                                 return (-1);
1336                         }
1337                         memset (ent, 0, sizeof (receive_list_entry_t));
1338                         ent->next = NULL;
1339
1340                         /* Hopefully this be optimized out by the compiler. It
1341                          * might help prevent stupid bugs in the future though.
1342                          */
1343                         assert (sizeof (ent->data) == sizeof (buffer));
1344
1345                         memcpy (ent->data, buffer, buffer_len);
1346                         ent->data_len = buffer_len;
1347
1348                         if (private_list_head == NULL)
1349                                 private_list_head = ent;
1350                         else
1351                                 private_list_tail->next = ent;
1352                         private_list_tail = ent;
1353
1354                         /* Do not block here. Blocking here has led to
1355                          * insufficient performance in the past. */
1356                         if (pthread_mutex_trylock (&receive_list_lock) == 0)
1357                         {
1358                                 if (receive_list_head == NULL)
1359                                         receive_list_head = private_list_head;
1360                                 else
1361                                         receive_list_tail->next = private_list_head;
1362                                 receive_list_tail = private_list_tail;
1363
1364                                 private_list_head = NULL;
1365                                 private_list_tail = NULL;
1366
1367                                 pthread_cond_signal (&receive_list_cond);
1368                                 pthread_mutex_unlock (&receive_list_lock);
1369                         }
1370                 } /* for (listen_sockets) */
1371         } /* while (listen_loop == 0) */
1372
1373         /* Make sure everything is dispatched before exiting. */
1374         if (private_list_head != NULL)
1375         {
1376                 pthread_mutex_lock (&receive_list_lock);
1377
1378                 if (receive_list_head == NULL)
1379                         receive_list_head = private_list_head;
1380                 else
1381                         receive_list_tail->next = private_list_head;
1382                 receive_list_tail = private_list_tail;
1383
1384                 private_list_head = NULL;
1385                 private_list_tail = NULL;
1386
1387                 pthread_cond_signal (&receive_list_cond);
1388                 pthread_mutex_unlock (&receive_list_lock);
1389         }
1390
1391         return (0);
1392 }
1393
1394 static void *receive_thread (void *arg)
1395 {
1396         return (network_receive () ? (void *) 1 : (void *) 0);
1397 } /* void *receive_thread */
1398
1399 static void network_send_buffer (const char *buffer, int buffer_len)
1400 {
1401         sockent_t *se;
1402         int status;
1403
1404         DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1405
1406         for (se = sending_sockets; se != NULL; se = se->next)
1407         {
1408                 while (42)
1409                 {
1410                         status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1411                                         (struct sockaddr *) se->addr, se->addrlen);
1412                         if (status < 0)
1413                         {
1414                                 char errbuf[1024];
1415                                 if (errno == EINTR)
1416                                         continue;
1417                                 ERROR ("network plugin: sendto failed: %s",
1418                                                 sstrerror (errno, errbuf,
1419                                                         sizeof (errbuf)));
1420                                 break;
1421                         }
1422
1423                         break;
1424                 } /* while (42) */
1425         } /* for (sending_sockets) */
1426 } /* void network_send_buffer */
1427
1428 static int add_to_buffer (char *buffer, int buffer_size,
1429                 value_list_t *vl_def,
1430                 const data_set_t *ds, const value_list_t *vl)
1431 {
1432         char *buffer_orig = buffer;
1433
1434         if (strcmp (vl_def->host, vl->host) != 0)
1435         {
1436                 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1437                                         vl->host, strlen (vl->host)) != 0)
1438                         return (-1);
1439                 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
1440         }
1441
1442         if (vl_def->time != vl->time)
1443         {
1444                 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1445                                         (uint64_t) vl->time))
1446                         return (-1);
1447                 vl_def->time = vl->time;
1448         }
1449
1450         if (vl_def->interval != vl->interval)
1451         {
1452                 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
1453                                         (uint64_t) vl->interval))
1454                         return (-1);
1455                 vl_def->interval = vl->interval;
1456         }
1457
1458         if (strcmp (vl_def->plugin, vl->plugin) != 0)
1459         {
1460                 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1461                                         vl->plugin, strlen (vl->plugin)) != 0)
1462                         return (-1);
1463                 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
1464         }
1465
1466         if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1467         {
1468                 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1469                                         vl->plugin_instance,
1470                                         strlen (vl->plugin_instance)) != 0)
1471                         return (-1);
1472                 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
1473         }
1474
1475         if (strcmp (vl_def->type, vl->type) != 0)
1476         {
1477                 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1478                                         vl->type, strlen (vl->type)) != 0)
1479                         return (-1);
1480                 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
1481         }
1482
1483         if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1484         {
1485                 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1486                                         vl->type_instance,
1487                                         strlen (vl->type_instance)) != 0)
1488                         return (-1);
1489                 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
1490         }
1491
1492         if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1493                 return (-1);
1494
1495         return (buffer - buffer_orig);
1496 } /* int add_to_buffer */
1497
1498 static void flush_buffer (void)
1499 {
1500         DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1501                         send_buffer_fill);
1502
1503         network_send_buffer (send_buffer, send_buffer_fill);
1504         send_buffer_ptr  = send_buffer;
1505         send_buffer_fill = 0;
1506         memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
1507 }
1508
1509 static int network_write (const data_set_t *ds, const value_list_t *vl)
1510 {
1511         int status;
1512
1513         /* If the value is already in the cache, we have received it via the
1514          * network. We write it again if forwarding is activated. It's then in
1515          * the cache and should we receive it again we will ignore it. */
1516         status = cache_check (vl);
1517         if ((network_config_forward == 0)
1518                         && (status != 0))
1519                 return (0);
1520
1521         pthread_mutex_lock (&send_buffer_lock);
1522
1523         status = add_to_buffer (send_buffer_ptr,
1524                         sizeof (send_buffer) - send_buffer_fill,
1525                         &send_buffer_vl,
1526                         ds, vl);
1527         if (status >= 0)
1528         {
1529                 /* status == bytes added to the buffer */
1530                 send_buffer_fill += status;
1531                 send_buffer_ptr  += status;
1532         }
1533         else
1534         {
1535                 flush_buffer ();
1536
1537                 status = add_to_buffer (send_buffer_ptr,
1538                                 sizeof (send_buffer) - send_buffer_fill,
1539                                 &send_buffer_vl,
1540                                 ds, vl);
1541
1542                 if (status >= 0)
1543                 {
1544                         send_buffer_fill += status;
1545                         send_buffer_ptr  += status;
1546                 }
1547         }
1548
1549         if (status < 0)
1550         {
1551                 ERROR ("network plugin: Unable to append to the "
1552                                 "buffer for some weird reason");
1553         }
1554         else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1555         {
1556                 flush_buffer ();
1557         }
1558
1559         pthread_mutex_unlock (&send_buffer_lock);
1560
1561         return ((status < 0) ? -1 : 0);
1562 } /* int network_write */
1563
1564 static int network_config (const char *key, const char *val)
1565 {
1566         char *node;
1567         char *service;
1568
1569         char *fields[3];
1570         int   fields_num;
1571
1572         if ((strcasecmp ("Listen", key) == 0)
1573                         || (strcasecmp ("Server", key) == 0))
1574         {
1575                 char *val_cpy = strdup (val);
1576                 if (val_cpy == NULL)
1577                         return (1);
1578
1579                 service = NET_DEFAULT_PORT;
1580                 fields_num = strsplit (val_cpy, fields, 3);
1581                 if ((fields_num != 1)
1582                                 && (fields_num != 2))
1583                 {
1584                         sfree (val_cpy);
1585                         return (1);
1586                 }
1587                 else if (fields_num == 2)
1588                 {
1589                         if ((service = strchr (fields[1], '.')) != NULL)
1590                                 *service = '\0';
1591                         service = fields[1];
1592                 }
1593                 node = fields[0];
1594
1595                 if (strcasecmp ("Listen", key) == 0)
1596                         network_add_listen_socket (node, service);
1597                 else
1598                         network_add_sending_socket (node, service);
1599
1600                 sfree (val_cpy);
1601         }
1602         else if (strcasecmp ("TimeToLive", key) == 0)
1603         {
1604                 int tmp = atoi (val);
1605                 if ((tmp > 0) && (tmp < 256))
1606                         network_config_ttl = tmp;
1607                 else
1608                         return (1);
1609         }
1610         else if (strcasecmp ("Forward", key) == 0)
1611         {
1612                 if ((strcasecmp ("true", val) == 0)
1613                                 || (strcasecmp ("yes", val) == 0)
1614                                 || (strcasecmp ("on", val) == 0))
1615                         network_config_forward = 1;
1616                 else
1617                         network_config_forward = 0;
1618         }
1619         else if (strcasecmp ("CacheFlush", key) == 0)
1620         {
1621                 int tmp = atoi (val);
1622                 if (tmp > 0)
1623                         cache_flush_interval = tmp;
1624                 else return (1);
1625         }
1626         else
1627         {
1628                 return (-1);
1629         }
1630         return (0);
1631 } /* int network_config */
1632
1633 static int network_notification (const notification_t *n)
1634 {
1635   char  buffer[BUFF_SIZE];
1636   char *buffer_ptr = buffer;
1637   int   buffer_free = sizeof (buffer);
1638   int   status;
1639
1640   memset (buffer, '\0', sizeof (buffer));
1641
1642
1643   status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
1644       (uint64_t) n->time);
1645   if (status != 0)
1646     return (-1);
1647
1648   status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
1649       (uint64_t) n->severity);
1650   if (status != 0)
1651     return (-1);
1652
1653   if (strlen (n->host) > 0)
1654   {
1655     status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
1656         n->host, strlen (n->host));
1657     if (status != 0)
1658       return (-1);
1659   }
1660
1661   if (strlen (n->plugin) > 0)
1662   {
1663     status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
1664         n->plugin, strlen (n->plugin));
1665     if (status != 0)
1666       return (-1);
1667   }
1668
1669   if (strlen (n->plugin_instance) > 0)
1670   {
1671     status = write_part_string (&buffer_ptr, &buffer_free,
1672         TYPE_PLUGIN_INSTANCE,
1673         n->plugin_instance, strlen (n->plugin_instance));
1674     if (status != 0)
1675       return (-1);
1676   }
1677
1678   if (strlen (n->type) > 0)
1679   {
1680     status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
1681         n->type, strlen (n->type));
1682     if (status != 0)
1683       return (-1);
1684   }
1685
1686   if (strlen (n->type_instance) > 0)
1687   {
1688     status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
1689         n->type_instance, strlen (n->type_instance));
1690     if (status != 0)
1691       return (-1);
1692   }
1693
1694   status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
1695       n->message, strlen (n->message));
1696   if (status != 0)
1697     return (-1);
1698
1699   network_send_buffer (buffer, sizeof (buffer) - buffer_free);
1700
1701   return (0);
1702 } /* int network_notification */
1703
1704 static int network_shutdown (void)
1705 {
1706         listen_loop++;
1707
1708         /* Kill the listening thread */
1709         if (receive_thread_id != (pthread_t) 0)
1710         {
1711                 pthread_kill (receive_thread_id, SIGTERM);
1712                 pthread_join (receive_thread_id, NULL /* no return value */);
1713                 receive_thread_id = (pthread_t) 0;
1714         }
1715
1716         /* Shutdown the dispatching thread */
1717         if (dispatch_thread_id != (pthread_t) 0)
1718                 pthread_cond_broadcast (&receive_list_cond);
1719
1720         if (send_buffer_fill > 0)
1721                 flush_buffer ();
1722
1723         if (cache_tree != NULL)
1724         {
1725                 void *key;
1726                 void *value;
1727
1728                 while (c_avl_pick (cache_tree, &key, &value) == 0)
1729                 {
1730                         sfree (key);
1731                         sfree (value);
1732                 }
1733                 c_avl_destroy (cache_tree);
1734                 cache_tree = NULL;
1735         }
1736
1737         /* TODO: Close `sending_sockets' */
1738
1739         plugin_unregister_config ("network");
1740         plugin_unregister_init ("network");
1741         plugin_unregister_write ("network");
1742         plugin_unregister_shutdown ("network");
1743
1744         /* Let the init function do it's move again ;) */
1745         cache_flush_last = 0;
1746
1747         return (0);
1748 } /* int network_shutdown */
1749
1750 static int network_init (void)
1751 {
1752         /* Check if we were already initialized. If so, just return - there's
1753          * nothing more to do (for now, that is). */
1754         if (cache_flush_last != 0)
1755                 return (0);
1756
1757         plugin_register_shutdown ("network", network_shutdown);
1758
1759         send_buffer_ptr  = send_buffer;
1760         send_buffer_fill = 0;
1761         memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
1762
1763         cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1764         cache_flush_last = time (NULL);
1765
1766         /* setup socket(s) and so on */
1767         if (sending_sockets != NULL)
1768         {
1769                 plugin_register_write ("network", network_write);
1770                 plugin_register_notification ("network", network_notification);
1771         }
1772
1773         if ((listen_sockets_num != 0) && (receive_thread_id == 0))
1774         {
1775                 int status;
1776
1777                 status = pthread_create (&dispatch_thread_id,
1778                                 NULL /* no attributes */,
1779                                 dispatch_thread,
1780                                 NULL /* no argument */);
1781                 if (status != 0)
1782                 {
1783                         char errbuf[1024];
1784                         ERROR ("network: pthread_create failed: %s",
1785                                         sstrerror (errno, errbuf,
1786                                                 sizeof (errbuf)));
1787                 }
1788
1789                 status = pthread_create (&receive_thread_id,
1790                                 NULL /* no attributes */,
1791                                 receive_thread,
1792                                 NULL /* no argument */);
1793                 if (status != 0)
1794                 {
1795                         char errbuf[1024];
1796                         ERROR ("network: pthread_create failed: %s",
1797                                         sstrerror (errno, errbuf,
1798                                                 sizeof (errbuf)));
1799                 }
1800         }
1801         return (0);
1802 } /* int network_init */
1803
1804 /*
1805  * The flush option of the network plugin cannot flush individual identifiers.
1806  * All the values are added to a buffer and sent when the buffer is full, the
1807  * requested value may or may not be in there, it's not worth finding out. We
1808  * just send the buffer if `flush'  is called - if the requested value was in
1809  * there, good. If not, well, then there is nothing to flush.. -octo
1810  */
1811 static int network_flush (int timeout, const char *identifier)
1812 {
1813         pthread_mutex_lock (&send_buffer_lock);
1814
1815         if (((time (NULL) - cache_flush_last) >= timeout)
1816                         && (send_buffer_fill > 0))
1817         {
1818                 flush_buffer ();
1819         }
1820
1821         pthread_mutex_unlock (&send_buffer_lock);
1822
1823         return (0);
1824 } /* int network_flush */
1825
1826 void module_register (void)
1827 {
1828         plugin_register_config ("network", network_config,
1829                         config_keys, config_keys_num);
1830         plugin_register_init   ("network", network_init);
1831         plugin_register_flush   ("network", network_flush);
1832 } /* void module_register */