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