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 < 0) || ((size_t) 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 < 0) || ((size_t) 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 < 0) || ((size_t) 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 ((output_len < 0)
 648                         || ((size_t) output_len < ((size_t) pkg_length - header_size)))
 649         {
 650                 WARNING ("network plugin: parse_part_string: "
 651                                 "Output buffer too small.");
 652                 return (-1);
 653         }
 654
 655         /* All sanity checks successfull, let's copy the data over */
 656         output_len = pkg_length - header_size;
 657         memcpy ((void *) output, (void *) buffer, output_len);
 658         buffer += output_len;
 659
 660         /* For some very weird reason '\0' doesn't do the trick on SPARC in
 661          * this statement. */
 662         if (output[output_len - 1] != 0)
 663         {
 664                 WARNING ("network plugin: parse_part_string: "
 665                                 "Received string does not end "
 666                                 "with a NULL-byte.");
 667                 return (-1);
 668         }
 669
 670         *ret_buffer = buffer;
 671         *ret_buffer_len = buffer_len - pkg_length;
 672
 673         return (0);
 674 } /* int parse_part_string */
 675
 676 static int parse_packet (void *buffer, int buffer_len)
 677 {
 678         int status;
 679
 680         value_list_t vl = VALUE_LIST_INIT;
 681         notification_t n;
 682
 683         DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
 684                         buffer, buffer_len);
 685
 686         memset (&vl, '\0', sizeof (vl));
 687         memset (&n, '\0', sizeof (n));
 688         status = 0;
 689
 690         while ((status == 0) && (0 < buffer_len)
 691                         && ((unsigned int) buffer_len > sizeof (part_header_t)))
 692         {
 693                 uint16_t pkg_length;
 694                 uint16_t pkg_type;
 695
 696                 memcpy ((void *) &pkg_type,
 697                                 (void *) buffer,
 698                                 sizeof (pkg_type));
 699                 memcpy ((void *) &pkg_length,
 700                                 (void *) (buffer + sizeof (pkg_type)),
 701                                 sizeof (pkg_length));
 702
 703                 pkg_length = ntohs (pkg_length);
 704                 pkg_type = ntohs (pkg_type);
 705
 706                 if (pkg_length > buffer_len)
 707                         break;
 708                 /* Ensure that this loop terminates eventually */
 709                 if (pkg_length < (2 * sizeof (uint16_t)))
 710                         break;
 711
 712                 if (pkg_type == TYPE_VALUES)
 713                 {
 714                         status = parse_part_values (&buffer, &buffer_len,
 715                                         &vl.values, &vl.values_len);
 716
 717                         if (status != 0)
 718                                 break;
 719
 720                         if ((vl.time > 0)
 721                                         && (strlen (vl.host) > 0)
 722                                         && (strlen (vl.plugin) > 0)
 723                                         && (strlen (vl.type) > 0)
 724                                         && (cache_check (&vl) == 0))
 725                         {
 726                                 plugin_dispatch_values (&vl);
 727                         }
 728                         else
 729                         {
 730                                 DEBUG ("network plugin: parse_packet:"
 731                                                 " NOT dispatching values");
 732                         }
 733
 734                         sfree (vl.values);
 735                 }
 736                 else if (pkg_type == TYPE_TIME)
 737                 {
 738                         uint64_t tmp = 0;
 739                         status = parse_part_number (&buffer, &buffer_len,
 740                                         &tmp);
 741                         if (status == 0)
 742                         {
 743                                 vl.time = (time_t) tmp;
 744                                 n.time = (time_t) tmp;
 745                         }
 746                 }
 747                 else if (pkg_type == TYPE_INTERVAL)
 748                 {
 749                         uint64_t tmp = 0;
 750                         status = parse_part_number (&buffer, &buffer_len,
 751                                         &tmp);
 752                         if (status == 0)
 753                                 vl.interval = (int) tmp;
 754                 }
 755                 else if (pkg_type == TYPE_HOST)
 756                 {
 757                         status = parse_part_string (&buffer, &buffer_len,
 758                                         vl.host, sizeof (vl.host));
 759                         if (status == 0)
 760                                 sstrncpy (n.host, vl.host, sizeof (n.host));
 761                 }
 762                 else if (pkg_type == TYPE_PLUGIN)
 763                 {
 764                         status = parse_part_string (&buffer, &buffer_len,
 765                                         vl.plugin, sizeof (vl.plugin));
 766                         if (status == 0)
 767                                 sstrncpy (n.plugin, vl.plugin,
 768                                                 sizeof (n.plugin));
 769                 }
 770                 else if (pkg_type == TYPE_PLUGIN_INSTANCE)
 771                 {
 772                         status = parse_part_string (&buffer, &buffer_len,
 773                                         vl.plugin_instance,
 774                                         sizeof (vl.plugin_instance));
 775                         if (status == 0)
 776                                 sstrncpy (n.plugin_instance,
 777                                                 vl.plugin_instance,
 778                                                 sizeof (n.plugin_instance));
 779                 }
 780                 else if (pkg_type == TYPE_TYPE)
 781                 {
 782                         status = parse_part_string (&buffer, &buffer_len,
 783                                         vl.type, sizeof (vl.type));
 784                         if (status == 0)
 785                                 sstrncpy (n.type, vl.type, sizeof (n.type));
 786                 }
 787                 else if (pkg_type == TYPE_TYPE_INSTANCE)
 788                 {
 789                         status = parse_part_string (&buffer, &buffer_len,
 790                                         vl.type_instance,
 791                                         sizeof (vl.type_instance));
 792                         if (status == 0)
 793                                 sstrncpy (n.type_instance, vl.type_instance,
 794                                                 sizeof (n.type_instance));
 795                 }
 796                 else if (pkg_type == TYPE_MESSAGE)
 797                 {
 798                         status = parse_part_string (&buffer, &buffer_len,
 799                                         n.message, sizeof (n.message));
 800
 801                         if (status != 0)
 802                         {
 803                                 /* do nothing */
 804                         }
 805                         else if ((n.severity != NOTIF_FAILURE)
 806                                         && (n.severity != NOTIF_WARNING)
 807                                         && (n.severity != NOTIF_OKAY))
 808                         {
 809                                 INFO ("network plugin: "
 810                                                 "Ignoring notification with "
 811                                                 "unknown severity %i.",
 812                                                 n.severity);
 813                         }
 814                         else if (n.time <= 0)
 815                         {
 816                                 INFO ("network plugin: "
 817                                                 "Ignoring notification with "
 818                                                 "time == 0.");
 819                         }
 820                         else if (strlen (n.message) <= 0)
 821                         {
 822                                 INFO ("network plugin: "
 823                                                 "Ignoring notification with "
 824                                                 "an empty message.");
 825                         }
 826                         else
 827                         {
 828                                 plugin_dispatch_notification (&n);
 829                         }
 830                 }
 831                 else if (pkg_type == TYPE_SEVERITY)
 832                 {
 833                         uint64_t tmp = 0;
 834                         status = parse_part_number (&buffer, &buffer_len,
 835                                         &tmp);
 836                         if (status == 0)
 837                                 n.severity = (int) tmp;
 838                 }
 839                 else
 840                 {
 841                         DEBUG ("network plugin: parse_packet: Unknown part"
 842                                         " type: 0x%04hx", pkg_type);
 843                         buffer = ((char *) buffer) + pkg_length;
 844                 }
 845         } /* while (buffer_len > sizeof (part_header_t)) */
 846
 847         return (status);
 848 } /* int parse_packet */
 849
 850 static void free_sockent (sockent_t *se)
 851 {
 852         sockent_t *next;
 853         while (se != NULL)
 854         {
 855                 next = se->next;
 856                 free (se->addr);
 857                 free (se);
 858                 se = next;
 859         }
 860 } /* void free_sockent */
 861
 862 /*
 863  * int network_set_ttl
 864  *
 865  * Set the `IP_MULTICAST_TTL', `IP_TTL', `IPV6_MULTICAST_HOPS' or
 866  * `IPV6_UNICAST_HOPS', depending on which option is applicable.
 867  *
 868  * The `struct addrinfo' is used to destinguish between unicast and multicast
 869  * sockets.
 870  */
 871 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
 872 {
 873         if ((network_config_ttl < 1) || (network_config_ttl > 255))
 874                 return (-1);
 875
 876         DEBUG ("ttl = %i", network_config_ttl);
 877
 878         if (ai->ai_family == AF_INET)
 879         {
 880                 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
 881                 int optname;
 882
 883                 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
 884                         optname = IP_MULTICAST_TTL;
 885                 else
 886                         optname = IP_TTL;
 887
 888                 if (setsockopt (se->fd, IPPROTO_IP, optname,
 889                                         &network_config_ttl,
 890                                         sizeof (network_config_ttl)) == -1)
 891                 {
 892                         char errbuf[1024];
 893                         ERROR ("setsockopt: %s",
 894                                         sstrerror (errno, errbuf, sizeof (errbuf)));
 895                         return (-1);
 896                 }
 897         }
 898         else if (ai->ai_family == AF_INET6)
 899         {
 900                 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
 901                 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
 902                 int optname;
 903
 904                 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
 905                         optname = IPV6_MULTICAST_HOPS;
 906                 else
 907                         optname = IPV6_UNICAST_HOPS;
 908
 909                 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
 910                                         &network_config_ttl,
 911                                         sizeof (network_config_ttl)) == -1)
 912                 {
 913                         char errbuf[1024];
 914                         ERROR ("setsockopt: %s",
 915                                         sstrerror (errno, errbuf,
 916                                                 sizeof (errbuf)));
 917                         return (-1);
 918                 }
 919         }
 920
 921         return (0);
 922 } /* int network_set_ttl */
 923
 924 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
 925 {
 926         int loop = 0;
 927         int yes  = 1;
 928
 929         /* allow multiple sockets to use the same PORT number */
 930         if (setsockopt(se->fd, SOL_SOCKET, SO_REUSEADDR,
 931                                 &yes, sizeof(yes)) == -1) {
 932                 char errbuf[1024];
 933                 ERROR ("setsockopt: %s",
 934                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 935                 return (-1);
 936         }
 937
 938         DEBUG ("fd = %i; calling `bind'", se->fd);
 939
 940         if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
 941         {
 942                 char errbuf[1024];
 943                 ERROR ("bind: %s",
 944                                 sstrerror (errno, errbuf, sizeof (errbuf)));
 945                 return (-1);
 946         }
 947
 948         if (ai->ai_family == AF_INET)
 949         {
 950                 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
 951                 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
 952                 {
 953                         struct ip_mreq mreq;
 954
 955                         DEBUG ("fd = %i; IPv4 multicast address found", se->fd);
 956
 957                         mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
 958                         mreq.imr_interface.s_addr = htonl (INADDR_ANY);
 959
 960                         if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
 961                                                 &loop, sizeof (loop)) == -1)
 962                         {
 963                                 char errbuf[1024];
 964                                 ERROR ("setsockopt: %s",
 965                                                 sstrerror (errno, errbuf,
 966                                                         sizeof (errbuf)));
 967                                 return (-1);
 968                         }
 969
 970                         if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 971                                                 &mreq, sizeof (mreq)) == -1)
 972                         {
 973                                 char errbuf[1024];
 974                                 ERROR ("setsockopt: %s",
 975                                                 sstrerror (errno, errbuf,
 976                                                         sizeof (errbuf)));
 977                                 return (-1);
 978                         }
 979                 }
 980         }
 981         else if (ai->ai_family == AF_INET6)
 982         {
 983                 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
 984                 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
 985                 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
 986                 {
 987                         struct ipv6_mreq mreq;
 988
 989                         DEBUG ("fd = %i; IPv6 multicast address found", se->fd);
 990
 991                         memcpy (&mreq.ipv6mr_multiaddr,
 992                                         &addr->sin6_addr,
 993                                         sizeof (addr->sin6_addr));
 994
 995                         /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
 996                          * ipv6mr_interface may be set to zeroes to
 997                          * choose the default multicast interface or to
 998                          * the index of a particular multicast-capable
 999                          * interface if the host is multihomed.
1000                          * Membership is associ-associated with a
1001                          * single interface; programs running on
1002                          * multihomed hosts may need to join the same
1003                          * group on more than one interface.*/
1004                         mreq.ipv6mr_interface = 0;
1005
1006                         if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1007                                                 &loop, sizeof (loop)) == -1)
1008                         {
1009                                 char errbuf[1024];
1010                                 ERROR ("setsockopt: %s",
1011                                                 sstrerror (errno, errbuf,
1012                                                         sizeof (errbuf)));
1013                                 return (-1);
1014                         }
1015
1016                         if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
1017                                                 &mreq, sizeof (mreq)) == -1)
1018                         {
1019                                 char errbuf[1024];
1020                                 ERROR ("setsockopt: %s",
1021                                                 sstrerror (errno, errbuf,
1022                                                         sizeof (errbuf)));
1023                                 return (-1);
1024                         }
1025                 }
1026         }
1027
1028         return (0);
1029 } /* int network_bind_socket */
1030
1031 static sockent_t *network_create_socket (const char *node,
1032                 const char *service,
1033                 int listen)
1034 {
1035         struct addrinfo  ai_hints;
1036         struct addrinfo *ai_list, *ai_ptr;
1037         int              ai_return;
1038
1039         sockent_t *se_head = NULL;
1040         sockent_t *se_tail = NULL;
1041
1042         DEBUG ("node = %s, service = %s", node, service);
1043
1044         memset (&ai_hints, '\0', sizeof (ai_hints));
1045         ai_hints.ai_flags    = 0;
1046 #ifdef AI_PASSIVE
1047         ai_hints.ai_flags |= AI_PASSIVE;
1048 #endif
1049 #ifdef AI_ADDRCONFIG
1050         ai_hints.ai_flags |= AI_ADDRCONFIG;
1051 #endif
1052         ai_hints.ai_family   = AF_UNSPEC;
1053         ai_hints.ai_socktype = SOCK_DGRAM;
1054         ai_hints.ai_protocol = IPPROTO_UDP;
1055
1056         ai_return = getaddrinfo (node, service, &ai_hints, &ai_list);
1057         if (ai_return != 0)
1058         {
1059                 char errbuf[1024];
1060                 ERROR ("getaddrinfo (%s, %s): %s",
1061                                 (node == NULL) ? "(null)" : node,
1062                                 (service == NULL) ? "(null)" : service,
1063                                 (ai_return == EAI_SYSTEM)
1064                                 ? sstrerror (errno, errbuf, sizeof (errbuf))
1065                                 : gai_strerror (ai_return));
1066                 return (NULL);
1067         }
1068
1069         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1070         {
1071                 sockent_t *se;
1072
1073                 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
1074                 {
1075                         char errbuf[1024];
1076                         ERROR ("malloc: %s",
1077                                         sstrerror (errno, errbuf,
1078                                                 sizeof (errbuf)));
1079                         continue;
1080                 }
1081
1082                 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
1083                 {
1084                         char errbuf[1024];
1085                         ERROR ("malloc: %s",
1086                                         sstrerror (errno, errbuf,
1087                                                 sizeof (errbuf)));
1088                         free (se);
1089                         continue;
1090                 }
1091
1092                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1093                 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
1094                 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1095                 se->addrlen = ai_ptr->ai_addrlen;
1096
1097                 se->fd   = socket (ai_ptr->ai_family,
1098                                 ai_ptr->ai_socktype,
1099                                 ai_ptr->ai_protocol);
1100                 se->next = NULL;
1101
1102                 if (se->fd == -1)
1103                 {
1104                         char errbuf[1024];
1105                         ERROR ("socket: %s",
1106                                         sstrerror (errno, errbuf,
1107                                                 sizeof (errbuf)));
1108                         free (se->addr);
1109                         free (se);
1110                         continue;
1111                 }
1112
1113                 if (listen != 0)
1114                 {
1115                         if (network_bind_socket (se, ai_ptr) != 0)
1116                         {
1117                                 close (se->fd);
1118                                 free (se->addr);
1119                                 free (se);
1120                                 continue;
1121                         }
1122                 }
1123                 else /* listen == 0 */
1124                 {
1125                         network_set_ttl (se, ai_ptr);
1126                 }
1127
1128                 if (se_tail == NULL)
1129                 {
1130                         se_head = se;
1131                         se_tail = se;
1132                 }
1133                 else
1134                 {
1135                         se_tail->next = se;
1136                         se_tail = se;
1137                 }
1138
1139                 /* We don't open more than one write-socket per node/service pair.. */
1140                 if (listen == 0)
1141                         break;
1142         }
1143
1144         freeaddrinfo (ai_list);
1145
1146         return (se_head);
1147 } /* sockent_t *network_create_socket */
1148
1149 static sockent_t *network_create_default_socket (int listen)
1150 {
1151         sockent_t *se_ptr  = NULL;
1152         sockent_t *se_head = NULL;
1153         sockent_t *se_tail = NULL;
1154
1155         se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
1156                         NET_DEFAULT_PORT, listen);
1157
1158         /* Don't send to the same machine in IPv6 and IPv4 if both are available. */
1159         if ((listen == 0) && (se_ptr != NULL))
1160                 return (se_ptr);
1161
1162         if (se_ptr != NULL)
1163         {
1164                 se_head = se_ptr;
1165                 se_tail = se_ptr;
1166                 while (se_tail->next != NULL)
1167                         se_tail = se_tail->next;
1168         }
1169
1170         se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
1171
1172         if (se_tail == NULL)
1173                 return (se_ptr);
1174
1175         se_tail->next = se_ptr;
1176         return (se_head);
1177 } /* sockent_t *network_create_default_socket */
1178
1179 static int network_add_listen_socket (const char *node, const char *service)
1180 {
1181         sockent_t *se;
1182         sockent_t *se_ptr;
1183         int se_num = 0;
1184
1185         if (service == NULL)
1186                 service = NET_DEFAULT_PORT;
1187
1188         if (node == NULL)
1189                 se = network_create_default_socket (1 /* listen == true */);
1190         else
1191                 se = network_create_socket (node, service, 1 /* listen == true */);
1192
1193         if (se == NULL)
1194                 return (-1);
1195
1196         for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1197                 se_num++;
1198
1199         listen_sockets = (struct pollfd *) realloc (listen_sockets,
1200                         (listen_sockets_num + se_num)
1201                         * sizeof (struct pollfd));
1202
1203         for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
1204         {
1205                 listen_sockets[listen_sockets_num].fd = se_ptr->fd;
1206                 listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
1207                 listen_sockets[listen_sockets_num].revents = 0;
1208                 listen_sockets_num++;
1209         } /* for (se) */
1210
1211         free_sockent (se);
1212         return (0);
1213 } /* int network_add_listen_socket */
1214
1215 static int network_add_sending_socket (const char *node, const char *service)
1216 {
1217         sockent_t *se;
1218         sockent_t *se_ptr;
1219
1220         if (service == NULL)
1221                 service = NET_DEFAULT_PORT;
1222
1223         if (node == NULL)
1224                 se = network_create_default_socket (0 /* listen == false */);
1225         else
1226                 se = network_create_socket (node, service, 0 /* listen == false */);
1227
1228         if (se == NULL)
1229                 return (-1);
1230
1231         if (sending_sockets == NULL)
1232         {
1233                 sending_sockets = se;
1234                 return (0);
1235         }
1236
1237         for (se_ptr = sending_sockets; se_ptr->next != NULL; se_ptr = se_ptr->next)
1238                 /* seek end */;
1239
1240         se_ptr->next = se;
1241         return (0);
1242 } /* int network_get_listen_socket */
1243
1244 static void *dispatch_thread (void __attribute__((unused)) *arg)
1245 {
1246   while (42)
1247   {
1248     receive_list_entry_t *ent;
1249
1250     /* Lock and wait for more data to come in */
1251     pthread_mutex_lock (&receive_list_lock);
1252     while ((listen_loop == 0)
1253         && (receive_list_head == NULL))
1254       pthread_cond_wait (&receive_list_cond, &receive_list_lock);
1255
1256     /* Remove the head entry and unlock */
1257     ent = receive_list_head;
1258     if (ent != NULL)
1259       receive_list_head = ent->next;
1260     pthread_mutex_unlock (&receive_list_lock);
1261
1262     /* Check whether we are supposed to exit. We do NOT check `listen_loop'
1263      * because we dispatch all missing packets before shutting down. */
1264     if (ent == NULL)
1265       break;
1266
1267     parse_packet (ent->data, ent->data_len);
1268
1269     sfree (ent);
1270   } /* while (42) */
1271
1272   return (NULL);
1273 } /* void *receive_thread */
1274
1275 static int network_receive (void)
1276 {
1277         char buffer[BUFF_SIZE];
1278         int  buffer_len;
1279
1280         int i;
1281         int status;
1282
1283         receive_list_entry_t *private_list_head;
1284         receive_list_entry_t *private_list_tail;
1285
1286         if (listen_sockets_num == 0)
1287                 network_add_listen_socket (NULL, NULL);
1288
1289         if (listen_sockets_num == 0)
1290         {
1291                 ERROR ("network: Failed to open a listening socket.");
1292                 return (-1);
1293         }
1294
1295         private_list_head = NULL;
1296         private_list_tail = NULL;
1297
1298         while (listen_loop == 0)
1299         {
1300                 status = poll (listen_sockets, listen_sockets_num, -1);
1301
1302                 if (status <= 0)
1303                 {
1304                         char errbuf[1024];
1305                         if (errno == EINTR)
1306                                 continue;
1307                         ERROR ("poll failed: %s",
1308                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1309                         return (-1);
1310                 }
1311
1312                 for (i = 0; (i < listen_sockets_num) && (status > 0); i++)
1313                 {
1314                         receive_list_entry_t *ent;
1315
1316                         if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
1317                                 continue;
1318                         status--;
1319
1320                         buffer_len = recv (listen_sockets[i].fd,
1321                                         buffer, sizeof (buffer),
1322                                         0 /* no flags */);
1323                         if (buffer_len < 0)
1324                         {
1325                                 char errbuf[1024];
1326                                 ERROR ("recv failed: %s",
1327                                                 sstrerror (errno, errbuf,
1328                                                         sizeof (errbuf)));
1329                                 return (-1);
1330                         }
1331
1332                         ent = malloc (sizeof (receive_list_entry_t));
1333                         if (ent == NULL)
1334                         {
1335                                 ERROR ("network plugin: malloc failed.");
1336                                 return (-1);
1337                         }
1338                         memset (ent, 0, sizeof (receive_list_entry_t));
1339                         ent->next = NULL;
1340
1341                         /* Hopefully this be optimized out by the compiler. It
1342                          * might help prevent stupid bugs in the future though.
1343                          */
1344                         assert (sizeof (ent->data) == sizeof (buffer));
1345
1346                         memcpy (ent->data, buffer, buffer_len);
1347                         ent->data_len = buffer_len;
1348
1349                         if (private_list_head == NULL)
1350                                 private_list_head = ent;
1351                         else
1352                                 private_list_tail->next = ent;
1353                         private_list_tail = ent;
1354
1355                         /* Do not block here. Blocking here has led to
1356                          * insufficient performance in the past. */
1357                         if (pthread_mutex_trylock (&receive_list_lock) == 0)
1358                         {
1359                                 if (receive_list_head == NULL)
1360                                         receive_list_head = private_list_head;
1361                                 else
1362                                         receive_list_tail->next = private_list_head;
1363                                 receive_list_tail = private_list_tail;
1364
1365                                 private_list_head = NULL;
1366                                 private_list_tail = NULL;
1367
1368                                 pthread_cond_signal (&receive_list_cond);
1369                                 pthread_mutex_unlock (&receive_list_lock);
1370                         }
1371                 } /* for (listen_sockets) */
1372         } /* while (listen_loop == 0) */
1373
1374         /* Make sure everything is dispatched before exiting. */
1375         if (private_list_head != NULL)
1376         {
1377                 pthread_mutex_lock (&receive_list_lock);
1378
1379                 if (receive_list_head == NULL)
1380                         receive_list_head = private_list_head;
1381                 else
1382                         receive_list_tail->next = private_list_head;
1383                 receive_list_tail = private_list_tail;
1384
1385                 private_list_head = NULL;
1386                 private_list_tail = NULL;
1387
1388                 pthread_cond_signal (&receive_list_cond);
1389                 pthread_mutex_unlock (&receive_list_lock);
1390         }
1391
1392         return (0);
1393 }
1394
1395 static void *receive_thread (void __attribute__((unused)) *arg)
1396 {
1397         return (network_receive () ? (void *) 1 : (void *) 0);
1398 } /* void *receive_thread */
1399
1400 static void network_send_buffer (const char *buffer, int buffer_len)
1401 {
1402         sockent_t *se;
1403         int status;
1404
1405         DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
1406
1407         for (se = sending_sockets; se != NULL; se = se->next)
1408         {
1409                 while (42)
1410                 {
1411                         status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
1412                                         (struct sockaddr *) se->addr, se->addrlen);
1413                         if (status < 0)
1414                         {
1415                                 char errbuf[1024];
1416                                 if (errno == EINTR)
1417                                         continue;
1418                                 ERROR ("network plugin: sendto failed: %s",
1419                                                 sstrerror (errno, errbuf,
1420                                                         sizeof (errbuf)));
1421                                 break;
1422                         }
1423
1424                         break;
1425                 } /* while (42) */
1426         } /* for (sending_sockets) */
1427 } /* void network_send_buffer */
1428
1429 static int add_to_buffer (char *buffer, int buffer_size,
1430                 value_list_t *vl_def,
1431                 const data_set_t *ds, const value_list_t *vl)
1432 {
1433         char *buffer_orig = buffer;
1434
1435         if (strcmp (vl_def->host, vl->host) != 0)
1436         {
1437                 if (write_part_string (&buffer, &buffer_size, TYPE_HOST,
1438                                         vl->host, strlen (vl->host)) != 0)
1439                         return (-1);
1440                 sstrncpy (vl_def->host, vl->host, sizeof (vl_def->host));
1441         }
1442
1443         if (vl_def->time != vl->time)
1444         {
1445                 if (write_part_number (&buffer, &buffer_size, TYPE_TIME,
1446                                         (uint64_t) vl->time))
1447                         return (-1);
1448                 vl_def->time = vl->time;
1449         }
1450
1451         if (vl_def->interval != vl->interval)
1452         {
1453                 if (write_part_number (&buffer, &buffer_size, TYPE_INTERVAL,
1454                                         (uint64_t) vl->interval))
1455                         return (-1);
1456                 vl_def->interval = vl->interval;
1457         }
1458
1459         if (strcmp (vl_def->plugin, vl->plugin) != 0)
1460         {
1461                 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN,
1462                                         vl->plugin, strlen (vl->plugin)) != 0)
1463                         return (-1);
1464                 sstrncpy (vl_def->plugin, vl->plugin, sizeof (vl_def->plugin));
1465         }
1466
1467         if (strcmp (vl_def->plugin_instance, vl->plugin_instance) != 0)
1468         {
1469                 if (write_part_string (&buffer, &buffer_size, TYPE_PLUGIN_INSTANCE,
1470                                         vl->plugin_instance,
1471                                         strlen (vl->plugin_instance)) != 0)
1472                         return (-1);
1473                 sstrncpy (vl_def->plugin_instance, vl->plugin_instance, sizeof (vl_def->plugin_instance));
1474         }
1475
1476         if (strcmp (vl_def->type, vl->type) != 0)
1477         {
1478                 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE,
1479                                         vl->type, strlen (vl->type)) != 0)
1480                         return (-1);
1481                 sstrncpy (vl_def->type, ds->type, sizeof (vl_def->type));
1482         }
1483
1484         if (strcmp (vl_def->type_instance, vl->type_instance) != 0)
1485         {
1486                 if (write_part_string (&buffer, &buffer_size, TYPE_TYPE_INSTANCE,
1487                                         vl->type_instance,
1488                                         strlen (vl->type_instance)) != 0)
1489                         return (-1);
1490                 sstrncpy (vl_def->type_instance, vl->type_instance, sizeof (vl_def->type_instance));
1491         }
1492
1493         if (write_part_values (&buffer, &buffer_size, ds, vl) != 0)
1494                 return (-1);
1495
1496         return (buffer - buffer_orig);
1497 } /* int add_to_buffer */
1498
1499 static void flush_buffer (void)
1500 {
1501         DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
1502                         send_buffer_fill);
1503
1504         network_send_buffer (send_buffer, send_buffer_fill);
1505         send_buffer_ptr  = send_buffer;
1506         send_buffer_fill = 0;
1507         memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
1508 }
1509
1510 static int network_write (const data_set_t *ds, const value_list_t *vl)
1511 {
1512         int status;
1513
1514         /* If the value is already in the cache, we have received it via the
1515          * network. We write it again if forwarding is activated. It's then in
1516          * the cache and should we receive it again we will ignore it. */
1517         status = cache_check (vl);
1518         if ((network_config_forward == 0)
1519                         && (status != 0))
1520                 return (0);
1521
1522         pthread_mutex_lock (&send_buffer_lock);
1523
1524         status = add_to_buffer (send_buffer_ptr,
1525                         sizeof (send_buffer) - send_buffer_fill,
1526                         &send_buffer_vl,
1527                         ds, vl);
1528         if (status >= 0)
1529         {
1530                 /* status == bytes added to the buffer */
1531                 send_buffer_fill += status;
1532                 send_buffer_ptr  += status;
1533         }
1534         else
1535         {
1536                 flush_buffer ();
1537
1538                 status = add_to_buffer (send_buffer_ptr,
1539                                 sizeof (send_buffer) - send_buffer_fill,
1540                                 &send_buffer_vl,
1541                                 ds, vl);
1542
1543                 if (status >= 0)
1544                 {
1545                         send_buffer_fill += status;
1546                         send_buffer_ptr  += status;
1547                 }
1548         }
1549
1550         if (status < 0)
1551         {
1552                 ERROR ("network plugin: Unable to append to the "
1553                                 "buffer for some weird reason");
1554         }
1555         else if ((sizeof (send_buffer) - send_buffer_fill) < 15)
1556         {
1557                 flush_buffer ();
1558         }
1559
1560         pthread_mutex_unlock (&send_buffer_lock);
1561
1562         return ((status < 0) ? -1 : 0);
1563 } /* int network_write */
1564
1565 static int network_config (const char *key, const char *val)
1566 {
1567         char *node;
1568         char *service;
1569
1570         char *fields[3];
1571         int   fields_num;
1572
1573         if ((strcasecmp ("Listen", key) == 0)
1574                         || (strcasecmp ("Server", key) == 0))
1575         {
1576                 char *val_cpy = strdup (val);
1577                 if (val_cpy == NULL)
1578                         return (1);
1579
1580                 service = NET_DEFAULT_PORT;
1581                 fields_num = strsplit (val_cpy, fields, 3);
1582                 if ((fields_num != 1)
1583                                 && (fields_num != 2))
1584                 {
1585                         sfree (val_cpy);
1586                         return (1);
1587                 }
1588                 else if (fields_num == 2)
1589                 {
1590                         if ((service = strchr (fields[1], '.')) != NULL)
1591                                 *service = '\0';
1592                         service = fields[1];
1593                 }
1594                 node = fields[0];
1595
1596                 if (strcasecmp ("Listen", key) == 0)
1597                         network_add_listen_socket (node, service);
1598                 else
1599                         network_add_sending_socket (node, service);
1600
1601                 sfree (val_cpy);
1602         }
1603         else if (strcasecmp ("TimeToLive", key) == 0)
1604         {
1605                 int tmp = atoi (val);
1606                 if ((tmp > 0) && (tmp < 256))
1607                         network_config_ttl = tmp;
1608                 else
1609                         return (1);
1610         }
1611         else if (strcasecmp ("Forward", key) == 0)
1612         {
1613                 if ((strcasecmp ("true", val) == 0)
1614                                 || (strcasecmp ("yes", val) == 0)
1615                                 || (strcasecmp ("on", val) == 0))
1616                         network_config_forward = 1;
1617                 else
1618                         network_config_forward = 0;
1619         }
1620         else if (strcasecmp ("CacheFlush", key) == 0)
1621         {
1622                 int tmp = atoi (val);
1623                 if (tmp > 0)
1624                         cache_flush_interval = tmp;
1625                 else return (1);
1626         }
1627         else
1628         {
1629                 return (-1);
1630         }
1631         return (0);
1632 } /* int network_config */
1633
1634 static int network_notification (const notification_t *n)
1635 {
1636   char  buffer[BUFF_SIZE];
1637   char *buffer_ptr = buffer;
1638   int   buffer_free = sizeof (buffer);
1639   int   status;
1640
1641   memset (buffer, '\0', sizeof (buffer));
1642
1643
1644   status = write_part_number (&buffer_ptr, &buffer_free, TYPE_TIME,
1645       (uint64_t) n->time);
1646   if (status != 0)
1647     return (-1);
1648
1649   status = write_part_number (&buffer_ptr, &buffer_free, TYPE_SEVERITY,
1650       (uint64_t) n->severity);
1651   if (status != 0)
1652     return (-1);
1653
1654   if (strlen (n->host) > 0)
1655   {
1656     status = write_part_string (&buffer_ptr, &buffer_free, TYPE_HOST,
1657         n->host, strlen (n->host));
1658     if (status != 0)
1659       return (-1);
1660   }
1661
1662   if (strlen (n->plugin) > 0)
1663   {
1664     status = write_part_string (&buffer_ptr, &buffer_free, TYPE_PLUGIN,
1665         n->plugin, strlen (n->plugin));
1666     if (status != 0)
1667       return (-1);
1668   }
1669
1670   if (strlen (n->plugin_instance) > 0)
1671   {
1672     status = write_part_string (&buffer_ptr, &buffer_free,
1673         TYPE_PLUGIN_INSTANCE,
1674         n->plugin_instance, strlen (n->plugin_instance));
1675     if (status != 0)
1676       return (-1);
1677   }
1678
1679   if (strlen (n->type) > 0)
1680   {
1681     status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE,
1682         n->type, strlen (n->type));
1683     if (status != 0)
1684       return (-1);
1685   }
1686
1687   if (strlen (n->type_instance) > 0)
1688   {
1689     status = write_part_string (&buffer_ptr, &buffer_free, TYPE_TYPE_INSTANCE,
1690         n->type_instance, strlen (n->type_instance));
1691     if (status != 0)
1692       return (-1);
1693   }
1694
1695   status = write_part_string (&buffer_ptr, &buffer_free, TYPE_MESSAGE,
1696       n->message, strlen (n->message));
1697   if (status != 0)
1698     return (-1);
1699
1700   network_send_buffer (buffer, sizeof (buffer) - buffer_free);
1701
1702   return (0);
1703 } /* int network_notification */
1704
1705 static int network_shutdown (void)
1706 {
1707         listen_loop++;
1708
1709         /* Kill the listening thread */
1710         if (receive_thread_id != (pthread_t) 0)
1711         {
1712                 pthread_kill (receive_thread_id, SIGTERM);
1713                 pthread_join (receive_thread_id, NULL /* no return value */);
1714                 receive_thread_id = (pthread_t) 0;
1715         }
1716
1717         /* Shutdown the dispatching thread */
1718         if (dispatch_thread_id != (pthread_t) 0)
1719                 pthread_cond_broadcast (&receive_list_cond);
1720
1721         if (send_buffer_fill > 0)
1722                 flush_buffer ();
1723
1724         if (cache_tree != NULL)
1725         {
1726                 void *key;
1727                 void *value;
1728
1729                 while (c_avl_pick (cache_tree, &key, &value) == 0)
1730                 {
1731                         sfree (key);
1732                         sfree (value);
1733                 }
1734                 c_avl_destroy (cache_tree);
1735                 cache_tree = NULL;
1736         }
1737
1738         /* TODO: Close `sending_sockets' */
1739
1740         plugin_unregister_config ("network");
1741         plugin_unregister_init ("network");
1742         plugin_unregister_write ("network");
1743         plugin_unregister_shutdown ("network");
1744
1745         /* Let the init function do it's move again ;) */
1746         cache_flush_last = 0;
1747
1748         return (0);
1749 } /* int network_shutdown */
1750
1751 static int network_init (void)
1752 {
1753         /* Check if we were already initialized. If so, just return - there's
1754          * nothing more to do (for now, that is). */
1755         if (cache_flush_last != 0)
1756                 return (0);
1757
1758         plugin_register_shutdown ("network", network_shutdown);
1759
1760         send_buffer_ptr  = send_buffer;
1761         send_buffer_fill = 0;
1762         memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
1763
1764         cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1765         cache_flush_last = time (NULL);
1766
1767         /* setup socket(s) and so on */
1768         if (sending_sockets != NULL)
1769         {
1770                 plugin_register_write ("network", network_write);
1771                 plugin_register_notification ("network", network_notification);
1772         }
1773
1774         if ((listen_sockets_num != 0) && (receive_thread_id == 0))
1775         {
1776                 int status;
1777
1778                 status = pthread_create (&dispatch_thread_id,
1779                                 NULL /* no attributes */,
1780                                 dispatch_thread,
1781                                 NULL /* no argument */);
1782                 if (status != 0)
1783                 {
1784                         char errbuf[1024];
1785                         ERROR ("network: pthread_create failed: %s",
1786                                         sstrerror (errno, errbuf,
1787                                                 sizeof (errbuf)));
1788                 }
1789
1790                 status = pthread_create (&receive_thread_id,
1791                                 NULL /* no attributes */,
1792                                 receive_thread,
1793                                 NULL /* no argument */);
1794                 if (status != 0)
1795                 {
1796                         char errbuf[1024];
1797                         ERROR ("network: pthread_create failed: %s",
1798                                         sstrerror (errno, errbuf,
1799                                                 sizeof (errbuf)));
1800                 }
1801         }
1802         return (0);
1803 } /* int network_init */
1804
1805 /*
1806  * The flush option of the network plugin cannot flush individual identifiers.
1807  * All the values are added to a buffer and sent when the buffer is full, the
1808  * requested value may or may not be in there, it's not worth finding out. We
1809  * just send the buffer if `flush'  is called - if the requested value was in
1810  * there, good. If not, well, then there is nothing to flush.. -octo
1811  */
1812 static int network_flush (int timeout,
1813                 const char __attribute__((unused)) *identifier)
1814 {
1815         pthread_mutex_lock (&send_buffer_lock);
1816
1817         if (((time (NULL) - cache_flush_last) >= timeout)
1818                         && (send_buffer_fill > 0))
1819         {
1820                 flush_buffer ();
1821         }
1822
1823         pthread_mutex_unlock (&send_buffer_lock);
1824
1825         return (0);
1826 } /* int network_flush */
1827
1828 void module_register (void)
1829 {
1830         plugin_register_config ("network", network_config,
1831                         config_keys, config_keys_num);
1832         plugin_register_init   ("network", network_init);
1833         plugin_register_flush   ("network", network_flush);
1834 } /* void module_register */