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