src/write_http.c

   1 /**
   2  * collectd - src/write_http.c
   3  * Copyright (C) 2009       Paul Sadauskas
   4  * Copyright (C) 2009       Doug MacEachern
   5  * Copyright (C) 2007-2014  Florian octo Forster
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; only version 2 of the License is applicable.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  *
  20  * Authors:
  21  *   Florian octo Forster <octo at collectd.org>
  22  *   Doug MacEachern <dougm@hyperic.com>
  23  *   Paul Sadauskas <psadauskas@gmail.com>
  24  **/
  25
  26 #include "collectd.h"
  27 #include "plugin.h"
  28 #include "common.h"
  29 #include "utils_format_json.h"
  30 #include "utils_format_kairosdb.h"
  31
  32 #include <curl/curl.h>
  33
  34 #ifndef WRITE_HTTP_DEFAULT_BUFFER_SIZE
  35 # define WRITE_HTTP_DEFAULT_BUFFER_SIZE 4096
  36 #endif
  37
  38 /*
  39  * Private variables
  40  */
  41 struct wh_callback_s
  42 {
  43         char *name;
  44
  45         char *location;
  46         char *user;
  47         char *pass;
  48         char *credentials;
  49         _Bool verify_peer;
  50         _Bool verify_host;
  51         char *cacert;
  52         char *capath;
  53         char *clientkey;
  54         char *clientcert;
  55         char *clientkeypass;
  56         long sslversion;
  57         _Bool store_rates;
  58         _Bool log_http_error;
  59         int   low_speed_limit;
  60         time_t low_speed_time;
  61         int timeout;
  62
  63 #define WH_FORMAT_COMMAND  0
  64 #define WH_FORMAT_JSON     1
  65 #define WH_FORMAT_KAIROSDB 2
  66         int format;
  67
  68         CURL *curl;
  69         struct curl_slist *headers;
  70         char curl_errbuf[CURL_ERROR_SIZE];
  71
  72         char  *send_buffer;
  73         size_t send_buffer_size;
  74         size_t send_buffer_free;
  75         size_t send_buffer_fill;
  76         cdtime_t send_buffer_init_time;
  77
  78         pthread_mutex_t send_lock;
  79 };
  80 typedef struct wh_callback_s wh_callback_t;
  81
  82 static void wh_log_http_error (wh_callback_t *cb)
  83 {
  84         if (!cb->log_http_error)
  85                 return;
  86
  87         long http_code = 0;
  88
  89         curl_easy_getinfo (cb->curl, CURLINFO_RESPONSE_CODE, &http_code);
  90
  91         if (http_code != 200)
  92                 INFO ("write_http plugin: HTTP Error code: %lu", http_code);
  93 }
  94
  95 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
  96 {
  97         memset (cb->send_buffer, 0, cb->send_buffer_size);
  98         cb->send_buffer_free = cb->send_buffer_size;
  99         cb->send_buffer_fill = 0;
 100         cb->send_buffer_init_time = cdtime ();
 101
 102         if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 103         {
 104                 format_json_initialize (cb->send_buffer,
 105                                 &cb->send_buffer_fill,
 106                                 &cb->send_buffer_free);
 107         }
 108 } /* }}} wh_reset_buffer */
 109
 110 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
 111 {
 112         int status = 0;
 113
 114         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
 115         status = curl_easy_perform (cb->curl);
 116
 117         wh_log_http_error (cb);
 118
 119         if (status != CURLE_OK)
 120         {
 121                 ERROR ("write_http plugin: curl_easy_perform failed with "
 122                                 "status %i: %s",
 123                                 status, cb->curl_errbuf);
 124         }
 125         return (status);
 126 } /* }}} wh_send_buffer */
 127
 128 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
 129 {
 130         if (cb->curl != NULL)
 131                 return (0);
 132
 133         cb->curl = curl_easy_init ();
 134         if (cb->curl == NULL)
 135         {
 136                 ERROR ("curl plugin: curl_easy_init failed.");
 137                 return (-1);
 138         }
 139
 140         if (cb->low_speed_limit > 0 && cb->low_speed_time > 0)
 141         {
 142                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_LIMIT,
 143                                   (long) (cb->low_speed_limit * cb->low_speed_time));
 144                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_TIME,
 145                                   (long) cb->low_speed_time);
 146         }
 147
 148 #ifdef HAVE_CURLOPT_TIMEOUT_MS
 149         if (cb->timeout > 0)
 150                 curl_easy_setopt (cb->curl, CURLOPT_TIMEOUT_MS, (long) cb->timeout);
 151 #endif
 152
 153         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
 154         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
 155
 156         cb->headers = curl_slist_append (cb->headers, "Accept:  */*");
 157         if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 158                 cb->headers = curl_slist_append (cb->headers, "Content-Type: application/json");
 159         else
 160                 cb->headers = curl_slist_append (cb->headers, "Content-Type: text/plain");
 161         cb->headers = curl_slist_append (cb->headers, "Expect:");
 162         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, cb->headers);
 163
 164         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
 165         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
 166         curl_easy_setopt (cb->curl, CURLOPT_FOLLOWLOCATION, 1L);
 167         curl_easy_setopt (cb->curl, CURLOPT_MAXREDIRS, 50L);
 168
 169         if (cb->user != NULL)
 170         {
 171 #ifdef HAVE_CURLOPT_USERNAME
 172                 curl_easy_setopt (cb->curl, CURLOPT_USERNAME, cb->user);
 173                 curl_easy_setopt (cb->curl, CURLOPT_PASSWORD,
 174                         (cb->pass == NULL) ? "" : cb->pass);
 175 #else
 176                 size_t credentials_size;
 177
 178                 credentials_size = strlen (cb->user) + 2;
 179                 if (cb->pass != NULL)
 180                         credentials_size += strlen (cb->pass);
 181
 182                 cb->credentials = malloc (credentials_size);
 183                 if (cb->credentials == NULL)
 184                 {
 185                         ERROR ("curl plugin: malloc failed.");
 186                         return (-1);
 187                 }
 188
 189                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
 190                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
 191                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
 192 #endif
 193                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 194         }
 195
 196         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
 197         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
 198                         cb->verify_host ? 2L : 0L);
 199         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
 200         if (cb->cacert != NULL)
 201                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
 202         if (cb->capath != NULL)
 203                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
 204
 205         if (cb->clientkey != NULL && cb->clientcert != NULL)
 206         {
 207             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
 208             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
 209
 210             if (cb->clientkeypass != NULL)
 211                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
 212         }
 213
 214         wh_reset_buffer (cb);
 215
 216         return (0);
 217 } /* }}} int wh_callback_init */
 218
 219 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
 220 {
 221         int status;
 222
 223         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
 224                         "send_buffer_fill = %zu;",
 225                         CDTIME_T_TO_DOUBLE (timeout),
 226                         cb->send_buffer_fill);
 227
 228         /* timeout == 0  => flush unconditionally */
 229         if (timeout > 0)
 230         {
 231                 cdtime_t now;
 232
 233                 now = cdtime ();
 234                 if ((cb->send_buffer_init_time + timeout) > now)
 235                         return (0);
 236         }
 237
 238         if (cb->format == WH_FORMAT_COMMAND)
 239         {
 240                 if (cb->send_buffer_fill == 0)
 241                 {
 242                         cb->send_buffer_init_time = cdtime ();
 243                         return (0);
 244                 }
 245
 246                 status = wh_send_buffer (cb);
 247                 wh_reset_buffer (cb);
 248         }
 249         else if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 250         {
 251                 if (cb->send_buffer_fill <= 2)
 252                 {
 253                         cb->send_buffer_init_time = cdtime ();
 254                         return (0);
 255                 }
 256
 257                 status = format_json_finalize (cb->send_buffer,
 258                                 &cb->send_buffer_fill,
 259                                 &cb->send_buffer_free);
 260                 if (status != 0)
 261                 {
 262                         ERROR ("write_http: wh_flush_nolock: "
 263                                         "format_json_finalize failed.");
 264                         wh_reset_buffer (cb);
 265                         return (status);
 266                 }
 267
 268                 status = wh_send_buffer (cb);
 269                 wh_reset_buffer (cb);
 270         }
 271         else
 272         {
 273                 ERROR ("write_http: wh_flush_nolock: "
 274                                 "Unknown format: %i",
 275                                 cb->format);
 276                 return (-1);
 277         }
 278
 279         return (status);
 280 } /* }}} wh_flush_nolock */
 281
 282 static int wh_flush (cdtime_t timeout, /* {{{ */
 283                 const char *identifier __attribute__((unused)),
 284                 user_data_t *user_data)
 285 {
 286         wh_callback_t *cb;
 287         int status;
 288
 289         if (user_data == NULL)
 290                 return (-EINVAL);
 291
 292         cb = user_data->data;
 293
 294         pthread_mutex_lock (&cb->send_lock);
 295
 296         if (cb->curl == NULL)
 297         {
 298                 status = wh_callback_init (cb);
 299                 if (status != 0)
 300                 {
 301                         ERROR ("write_http plugin: wh_callback_init failed.");
 302                         pthread_mutex_unlock (&cb->send_lock);
 303                         return (-1);
 304                 }
 305         }
 306
 307         status = wh_flush_nolock (timeout, cb);
 308         pthread_mutex_unlock (&cb->send_lock);
 309
 310         return (status);
 311 } /* }}} int wh_flush */
 312
 313 static void wh_callback_free (void *data) /* {{{ */
 314 {
 315         wh_callback_t *cb;
 316
 317         if (data == NULL)
 318                 return;
 319
 320         cb = data;
 321
 322         wh_flush_nolock (/* timeout = */ 0, cb);
 323
 324         if (cb->curl != NULL)
 325         {
 326                 curl_easy_cleanup (cb->curl);
 327                 cb->curl = NULL;
 328         }
 329
 330         if (cb->headers != NULL)
 331         {
 332                 curl_slist_free_all (cb->headers);
 333                 cb->headers = NULL;
 334         }
 335
 336         sfree (cb->name);
 337         sfree (cb->location);
 338         sfree (cb->user);
 339         sfree (cb->pass);
 340         sfree (cb->credentials);
 341         sfree (cb->cacert);
 342         sfree (cb->capath);
 343         sfree (cb->clientkey);
 344         sfree (cb->clientcert);
 345         sfree (cb->clientkeypass);
 346         sfree (cb->send_buffer);
 347
 348         sfree (cb);
 349 } /* }}} void wh_callback_free */
 350
 351 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 352                 wh_callback_t *cb)
 353 {
 354         char key[10*DATA_MAX_NAME_LEN];
 355         char values[512];
 356         char command[1024];
 357         size_t command_len;
 358
 359         int status;
 360
 361         if (0 != strcmp (ds->type, vl->type)) {
 362                 ERROR ("write_http plugin: DS type does not match "
 363                                 "value list type");
 364                 return -1;
 365         }
 366
 367         /* Copy the identifier to `key' and escape it. */
 368         status = FORMAT_VL (key, sizeof (key), vl);
 369         if (status != 0) {
 370                 ERROR ("write_http plugin: error with format_name");
 371                 return (status);
 372         }
 373         escape_string (key, sizeof (key));
 374
 375         /* Convert the values to an ASCII representation and put that into
 376          * `values'. */
 377         status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
 378         if (status != 0) {
 379                 ERROR ("write_http plugin: error with "
 380                                 "wh_value_list_to_string");
 381                 return (status);
 382         }
 383
 384         command_len = (size_t) ssnprintf (command, sizeof (command),
 385                         "PUTVAL %s interval=%.3f %s\r\n",
 386                         key,
 387                         CDTIME_T_TO_DOUBLE (vl->interval),
 388                         values);
 389         if (command_len >= sizeof (command)) {
 390                 ERROR ("write_http plugin: Command buffer too small: "
 391                                 "Need %zu bytes.", command_len + 1);
 392                 return (-1);
 393         }
 394
 395         pthread_mutex_lock (&cb->send_lock);
 396
 397         if (cb->curl == NULL)
 398         {
 399                 status = wh_callback_init (cb);
 400                 if (status != 0)
 401                 {
 402                         ERROR ("write_http plugin: wh_callback_init failed.");
 403                         pthread_mutex_unlock (&cb->send_lock);
 404                         return (-1);
 405                 }
 406         }
 407
 408         if (command_len >= cb->send_buffer_free)
 409         {
 410                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 411                 if (status != 0)
 412                 {
 413                         pthread_mutex_unlock (&cb->send_lock);
 414                         return (status);
 415                 }
 416         }
 417         assert (command_len < cb->send_buffer_free);
 418
 419         /* `command_len + 1' because `command_len' does not include the
 420          * trailing null byte. Neither does `send_buffer_fill'. */
 421         memcpy (cb->send_buffer + cb->send_buffer_fill,
 422                         command, command_len + 1);
 423         cb->send_buffer_fill += command_len;
 424         cb->send_buffer_free -= command_len;
 425
 426         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 427                         cb->location,
 428                         cb->send_buffer_fill, cb->send_buffer_size,
 429                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
 430                         command);
 431
 432         /* Check if we have enough space for this command. */
 433         pthread_mutex_unlock (&cb->send_lock);
 434
 435         return (0);
 436 } /* }}} int wh_write_command */
 437
 438 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 439                 wh_callback_t *cb)
 440 {
 441         int status;
 442
 443         pthread_mutex_lock (&cb->send_lock);
 444
 445         if (cb->curl == NULL)
 446         {
 447                 status = wh_callback_init (cb);
 448                 if (status != 0)
 449                 {
 450                         ERROR ("write_http plugin: wh_callback_init failed.");
 451                         pthread_mutex_unlock (&cb->send_lock);
 452                         return (-1);
 453                 }
 454         }
 455
 456         status = format_json_value_list (cb->send_buffer,
 457                         &cb->send_buffer_fill,
 458                         &cb->send_buffer_free,
 459                         ds, vl, cb->store_rates);
 460         if (status == -ENOMEM)
 461         {
 462                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 463                 if (status != 0)
 464                 {
 465                         wh_reset_buffer (cb);
 466                         pthread_mutex_unlock (&cb->send_lock);
 467                         return (status);
 468                 }
 469
 470                 status = format_json_value_list (cb->send_buffer,
 471                                 &cb->send_buffer_fill,
 472                                 &cb->send_buffer_free,
 473                                 ds, vl, cb->store_rates);
 474         }
 475         if (status != 0)
 476         {
 477                 pthread_mutex_unlock (&cb->send_lock);
 478                 return (status);
 479         }
 480
 481         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 482                         cb->location,
 483                         cb->send_buffer_fill, cb->send_buffer_size,
 484                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 485
 486         /* Check if we have enough space for this command. */
 487         pthread_mutex_unlock (&cb->send_lock);
 488
 489         return (0);
 490 } /* }}} int wh_write_json */
 491
 492 static int wh_write_kairosdb (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 493                 wh_callback_t *cb)
 494 {
 495         int status;
 496
 497         pthread_mutex_lock (&cb->send_lock);
 498
 499         if (cb->curl == NULL)
 500         {
 501                 status = wh_callback_init (cb);
 502                 if (status != 0)
 503                 {
 504                         ERROR ("write_http plugin: wh_callback_init failed.");
 505                         pthread_mutex_unlock (&cb->send_lock);
 506                         return (-1);
 507                 }
 508         }
 509
 510         status = format_kairosdb_value_list (cb->send_buffer,
 511                         &cb->send_buffer_fill,
 512                         &cb->send_buffer_free,
 513                         ds, vl, cb->store_rates);
 514         if (status == -ENOMEM)
 515         {
 516                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 517                 if (status != 0)
 518                 {
 519                         wh_reset_buffer (cb);
 520                         pthread_mutex_unlock (&cb->send_lock);
 521                         return (status);
 522                 }
 523
 524                 status = format_kairosdb_value_list (cb->send_buffer,
 525                                 &cb->send_buffer_fill,
 526                                 &cb->send_buffer_free,
 527                                 ds, vl, cb->store_rates);
 528         }
 529         if (status != 0)
 530         {
 531                 pthread_mutex_unlock (&cb->send_lock);
 532                 return (status);
 533         }
 534
 535         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 536                         cb->location,
 537                         cb->send_buffer_fill, cb->send_buffer_size,
 538                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 539
 540         /* Check if we have enough space for this command. */
 541         pthread_mutex_unlock (&cb->send_lock);
 542
 543         return (0);
 544 } /* }}} int wh_write_kairosdb */
 545
 546 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 547                 user_data_t *user_data)
 548 {
 549         wh_callback_t *cb;
 550         int status;
 551
 552         if (user_data == NULL)
 553                 return (-EINVAL);
 554
 555         cb = user_data->data;
 556
 557         switch(cb->format) {
 558             case WH_FORMAT_JSON:
 559                 status = wh_write_json (ds, vl, cb);
 560                 break;
 561             case WH_FORMAT_KAIROSDB:
 562                 status = wh_write_kairosdb (ds, vl, cb);
 563                 break;
 564             default:
 565                 status = wh_write_command (ds, vl, cb);
 566                 break;
 567         }
 568         return (status);
 569 } /* }}} int wh_write */
 570
 571 static int config_set_format (wh_callback_t *cb, /* {{{ */
 572                 oconfig_item_t *ci)
 573 {
 574         char *string;
 575
 576         if ((ci->values_num != 1)
 577                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 578         {
 579                 WARNING ("write_http plugin: The `%s' config option "
 580                                 "needs exactly one string argument.", ci->key);
 581                 return (-1);
 582         }
 583
 584         string = ci->values[0].value.string;
 585         if (strcasecmp ("Command", string) == 0)
 586                 cb->format = WH_FORMAT_COMMAND;
 587         else if (strcasecmp ("JSON", string) == 0)
 588                 cb->format = WH_FORMAT_JSON;
 589         else if (strcasecmp ("KAIROSDB", string) == 0)
 590                 cb->format = WH_FORMAT_KAIROSDB;
 591         else
 592         {
 593                 ERROR ("write_http plugin: Invalid format string: %s",
 594                                 string);
 595                 return (-1);
 596         }
 597
 598         return (0);
 599 } /* }}} int config_set_format */
 600
 601 static int wh_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
 602     oconfig_item_t *ci)
 603 {
 604   struct curl_slist *temp = NULL;
 605   if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
 606   {
 607     WARNING ("write_http plugin: `%s' needs exactly one string argument.", name);
 608     return (-1);
 609   }
 610
 611   temp = curl_slist_append(*dest, ci->values[0].value.string);
 612   if (temp == NULL)
 613     return (-1);
 614
 615   *dest = temp;
 616
 617   return (0);
 618 } /* }}} int wh_config_append_string */
 619
 620 static int wh_config_node (oconfig_item_t *ci) /* {{{ */
 621 {
 622         wh_callback_t *cb;
 623         int buffer_size = 0;
 624         user_data_t user_data = { 0 };
 625         char callback_name[DATA_MAX_NAME_LEN];
 626         int status = 0;
 627         int i;
 628
 629         cb = calloc (1, sizeof (*cb));
 630         if (cb == NULL)
 631         {
 632                 ERROR ("write_http plugin: calloc failed.");
 633                 return (-1);
 634         }
 635         cb->verify_peer = 1;
 636         cb->verify_host = 1;
 637         cb->format = WH_FORMAT_COMMAND;
 638         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 639         cb->low_speed_limit = 0;
 640         cb->timeout = 0;
 641         cb->log_http_error = 0;
 642         cb->headers = NULL;
 643
 644
 645         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 646
 647         cf_util_get_string (ci, &cb->name);
 648
 649         /* FIXME: Remove this legacy mode in version 6. */
 650         if (strcasecmp ("URL", ci->key) == 0)
 651                 cf_util_get_string (ci, &cb->location);
 652
 653         for (i = 0; i < ci->children_num; i++)
 654         {
 655                 oconfig_item_t *child = ci->children + i;
 656
 657                 if (strcasecmp ("URL", child->key) == 0)
 658                         status = cf_util_get_string (child, &cb->location);
 659                 else if (strcasecmp ("User", child->key) == 0)
 660                         status = cf_util_get_string (child, &cb->user);
 661                 else if (strcasecmp ("Password", child->key) == 0)
 662                         status = cf_util_get_string (child, &cb->pass);
 663                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 664                         status = cf_util_get_boolean (child, &cb->verify_peer);
 665                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 666                         status = cf_util_get_boolean (child, &cb->verify_host);
 667                 else if (strcasecmp ("CACert", child->key) == 0)
 668                         status = cf_util_get_string (child, &cb->cacert);
 669                 else if (strcasecmp ("CAPath", child->key) == 0)
 670                         status = cf_util_get_string (child, &cb->capath);
 671                 else if (strcasecmp ("ClientKey", child->key) == 0)
 672                         status = cf_util_get_string (child, &cb->clientkey);
 673                 else if (strcasecmp ("ClientCert", child->key) == 0)
 674                         status = cf_util_get_string (child, &cb->clientcert);
 675                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 676                         status = cf_util_get_string (child, &cb->clientkeypass);
 677                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 678                 {
 679                         char *value = NULL;
 680
 681                         status = cf_util_get_string (child, &value);
 682                         if (status != 0)
 683                                 break;
 684
 685                         if (value == NULL || strcasecmp ("default", value) == 0)
 686                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 687                         else if (strcasecmp ("SSLv2", value) == 0)
 688                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 689                         else if (strcasecmp ("SSLv3", value) == 0)
 690                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 691                         else if (strcasecmp ("TLSv1", value) == 0)
 692                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 693 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 694                         else if (strcasecmp ("TLSv1_0", value) == 0)
 695                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 696                         else if (strcasecmp ("TLSv1_1", value) == 0)
 697                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 698                         else if (strcasecmp ("TLSv1_2", value) == 0)
 699                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 700 #endif
 701                         else
 702                         {
 703                                 ERROR ("write_http plugin: Invalid SSLVersion "
 704                                                 "option: %s.", value);
 705                                 status = EINVAL;
 706                         }
 707
 708                         sfree(value);
 709                 }
 710                 else if (strcasecmp ("Format", child->key) == 0)
 711                         status = config_set_format (cb, child);
 712                 else if (strcasecmp ("StoreRates", child->key) == 0)
 713                         status = cf_util_get_boolean (child, &cb->store_rates);
 714                 else if (strcasecmp ("BufferSize", child->key) == 0)
 715                         status = cf_util_get_int (child, &buffer_size);
 716                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 717                         status = cf_util_get_int (child, &cb->low_speed_limit);
 718                 else if (strcasecmp ("Timeout", child->key) == 0)
 719                         status = cf_util_get_int (child, &cb->timeout);
 720                 else if (strcasecmp ("LogHttpError", child->key) == 0)
 721                         status = cf_util_get_boolean (child, &cb->log_http_error);
 722                 else if (strcasecmp ("Header", child->key) == 0)
 723                         status = wh_config_append_string ("Header", &cb->headers, child);
 724                 else
 725                 {
 726                         ERROR ("write_http plugin: Invalid configuration "
 727                                         "option: %s.", child->key);
 728                         status = EINVAL;
 729                 }
 730
 731                 if (status != 0)
 732                         break;
 733         }
 734
 735         if (status != 0)
 736         {
 737                 wh_callback_free (cb);
 738                 return (status);
 739         }
 740
 741         if (cb->location == NULL)
 742         {
 743                 ERROR ("write_http plugin: no URL defined for instance '%s'",
 744                         cb->name);
 745                 wh_callback_free (cb);
 746                 return (-1);
 747         }
 748
 749         if (cb->low_speed_limit > 0)
 750                 cb->low_speed_time = CDTIME_T_TO_TIME_T(plugin_get_interval());
 751
 752         /* Determine send_buffer_size. */
 753         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 754         if (buffer_size >= 1024)
 755                 cb->send_buffer_size = (size_t) buffer_size;
 756         else if (buffer_size != 0)
 757                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 758                                 buffer_size);
 759
 760         /* Allocate the buffer. */
 761         cb->send_buffer = malloc (cb->send_buffer_size);
 762         if (cb->send_buffer == NULL)
 763         {
 764                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 765                 wh_callback_free (cb);
 766                 return (-1);
 767         }
 768         /* Nulls the buffer and sets ..._free and ..._fill. */
 769         wh_reset_buffer (cb);
 770
 771         ssnprintf (callback_name, sizeof (callback_name), "write_http/%s",
 772                         cb->name);
 773         DEBUG ("write_http: Registering write callback '%s' with URL '%s'",
 774                         callback_name, cb->location);
 775
 776         user_data.data = cb;
 777         plugin_register_flush (callback_name, wh_flush, &user_data);
 778
 779         user_data.free_func = wh_callback_free;
 780         plugin_register_write (callback_name, wh_write, &user_data);
 781
 782         return (0);
 783 } /* }}} int wh_config_node */
 784
 785 static int wh_config (oconfig_item_t *ci) /* {{{ */
 786 {
 787         int i;
 788
 789         for (i = 0; i < ci->children_num; i++)
 790         {
 791                 oconfig_item_t *child = ci->children + i;
 792
 793                 if (strcasecmp ("Node", child->key) == 0)
 794                         wh_config_node (child);
 795                 /* FIXME: Remove this legacy mode in version 6. */
 796                 else if (strcasecmp ("URL", child->key) == 0) {
 797                         WARNING ("write_http plugin: Legacy <URL> block found. "
 798                                 "Please use <Node> instead.");
 799                         wh_config_node (child);
 800                 }
 801                 else
 802                 {
 803                         ERROR ("write_http plugin: Invalid configuration "
 804                                         "option: %s.", child->key);
 805                 }
 806         }
 807
 808         return (0);
 809 } /* }}} int wh_config */
 810
 811 static int wh_init (void) /* {{{ */
 812 {
 813         /* Call this while collectd is still single-threaded to avoid
 814          * initialization issues in libgcrypt. */
 815         curl_global_init (CURL_GLOBAL_SSL);
 816         return (0);
 817 } /* }}} int wh_init */
 818
 819 void module_register (void) /* {{{ */
 820 {
 821         plugin_register_complex_config ("write_http", wh_config);
 822         plugin_register_init ("write_http", wh_init);
 823 } /* }}} void module_register */
 824
 825 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */