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
  28 #include "plugin.h"
  29 #include "common.h"
  30 #include "utils_format_json.h"
  31 #include "utils_format_kairosdb.h"
  32
  33 #include <curl/curl.h>
  34
  35 #ifndef WRITE_HTTP_DEFAULT_BUFFER_SIZE
  36 # define WRITE_HTTP_DEFAULT_BUFFER_SIZE 4096
  37 #endif
  38
  39 /*
  40  * Private variables
  41  */
  42 struct wh_callback_s
  43 {
  44         char *name;
  45
  46         char *location;
  47         char *user;
  48         char *pass;
  49         char *credentials;
  50         _Bool verify_peer;
  51         _Bool verify_host;
  52         char *cacert;
  53         char *capath;
  54         char *clientkey;
  55         char *clientcert;
  56         char *clientkeypass;
  57         long sslversion;
  58         _Bool store_rates;
  59         _Bool log_http_error;
  60         int   low_speed_limit;
  61         time_t low_speed_time;
  62         int timeout;
  63
  64 #define WH_FORMAT_COMMAND  0
  65 #define WH_FORMAT_JSON     1
  66 #define WH_FORMAT_KAIROSDB 2
  67         int format;
  68
  69         CURL *curl;
  70         struct curl_slist *headers;
  71         char curl_errbuf[CURL_ERROR_SIZE];
  72
  73         char  *send_buffer;
  74         size_t send_buffer_size;
  75         size_t send_buffer_free;
  76         size_t send_buffer_fill;
  77         cdtime_t send_buffer_init_time;
  78
  79         pthread_mutex_t send_lock;
  80 };
  81 typedef struct wh_callback_s wh_callback_t;
  82
  83 static void wh_log_http_error (wh_callback_t *cb)
  84 {
  85         if (!cb->log_http_error)
  86                 return;
  87
  88         long http_code = 0;
  89
  90         curl_easy_getinfo (cb->curl, CURLINFO_RESPONSE_CODE, &http_code);
  91
  92         if (http_code != 200)
  93                 INFO ("write_http plugin: HTTP Error code: %lu", http_code);
  94 }
  95
  96 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
  97 {
  98         if ((cb == NULL) || (cb->send_buffer == NULL))
  99                 return;
 100
 101         memset (cb->send_buffer, 0, cb->send_buffer_size);
 102         cb->send_buffer_free = cb->send_buffer_size;
 103         cb->send_buffer_fill = 0;
 104         cb->send_buffer_init_time = cdtime ();
 105
 106         if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 107         {
 108                 format_json_initialize (cb->send_buffer,
 109                                 &cb->send_buffer_fill,
 110                                 &cb->send_buffer_free);
 111         }
 112 } /* }}} wh_reset_buffer */
 113
 114 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
 115 {
 116         int status = 0;
 117
 118         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
 119         status = curl_easy_perform (cb->curl);
 120
 121         wh_log_http_error (cb);
 122
 123         if (status != CURLE_OK)
 124         {
 125                 ERROR ("write_http plugin: curl_easy_perform failed with "
 126                                 "status %i: %s",
 127                                 status, cb->curl_errbuf);
 128         }
 129         return (status);
 130 } /* }}} wh_send_buffer */
 131
 132 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
 133 {
 134         if (cb->curl != NULL)
 135                 return (0);
 136
 137         cb->curl = curl_easy_init ();
 138         if (cb->curl == NULL)
 139         {
 140                 ERROR ("curl plugin: curl_easy_init failed.");
 141                 return (-1);
 142         }
 143
 144         if (cb->low_speed_limit > 0 && cb->low_speed_time > 0)
 145         {
 146                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_LIMIT,
 147                                   (long) (cb->low_speed_limit * cb->low_speed_time));
 148                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_TIME,
 149                                   (long) cb->low_speed_time);
 150         }
 151
 152 #ifdef HAVE_CURLOPT_TIMEOUT_MS
 153         if (cb->timeout > 0)
 154                 curl_easy_setopt (cb->curl, CURLOPT_TIMEOUT_MS, (long) cb->timeout);
 155 #endif
 156
 157         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
 158         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
 159
 160         cb->headers = curl_slist_append (cb->headers, "Accept:  */*");
 161         if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 162                 cb->headers = curl_slist_append (cb->headers, "Content-Type: application/json");
 163         else
 164                 cb->headers = curl_slist_append (cb->headers, "Content-Type: text/plain");
 165         cb->headers = curl_slist_append (cb->headers, "Expect:");
 166         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, cb->headers);
 167
 168         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
 169         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
 170         curl_easy_setopt (cb->curl, CURLOPT_FOLLOWLOCATION, 1L);
 171         curl_easy_setopt (cb->curl, CURLOPT_MAXREDIRS, 50L);
 172
 173         if (cb->user != NULL)
 174         {
 175 #ifdef HAVE_CURLOPT_USERNAME
 176                 curl_easy_setopt (cb->curl, CURLOPT_USERNAME, cb->user);
 177                 curl_easy_setopt (cb->curl, CURLOPT_PASSWORD,
 178                         (cb->pass == NULL) ? "" : cb->pass);
 179 #else
 180                 size_t credentials_size;
 181
 182                 credentials_size = strlen (cb->user) + 2;
 183                 if (cb->pass != NULL)
 184                         credentials_size += strlen (cb->pass);
 185
 186                 cb->credentials = malloc (credentials_size);
 187                 if (cb->credentials == NULL)
 188                 {
 189                         ERROR ("curl plugin: malloc failed.");
 190                         return (-1);
 191                 }
 192
 193                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
 194                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
 195                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
 196 #endif
 197                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 198         }
 199
 200         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
 201         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
 202                         cb->verify_host ? 2L : 0L);
 203         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
 204         if (cb->cacert != NULL)
 205                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
 206         if (cb->capath != NULL)
 207                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
 208
 209         if (cb->clientkey != NULL && cb->clientcert != NULL)
 210         {
 211             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
 212             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
 213
 214             if (cb->clientkeypass != NULL)
 215                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
 216         }
 217
 218         wh_reset_buffer (cb);
 219
 220         return (0);
 221 } /* }}} int wh_callback_init */
 222
 223 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
 224 {
 225         int status;
 226
 227         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
 228                         "send_buffer_fill = %zu;",
 229                         CDTIME_T_TO_DOUBLE (timeout),
 230                         cb->send_buffer_fill);
 231
 232         /* timeout == 0  => flush unconditionally */
 233         if (timeout > 0)
 234         {
 235                 cdtime_t now;
 236
 237                 now = cdtime ();
 238                 if ((cb->send_buffer_init_time + timeout) > now)
 239                         return (0);
 240         }
 241
 242         if (cb->format == WH_FORMAT_COMMAND)
 243         {
 244                 if (cb->send_buffer_fill == 0)
 245                 {
 246                         cb->send_buffer_init_time = cdtime ();
 247                         return (0);
 248                 }
 249
 250                 status = wh_send_buffer (cb);
 251                 wh_reset_buffer (cb);
 252         }
 253         else if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 254         {
 255                 if (cb->send_buffer_fill <= 2)
 256                 {
 257                         cb->send_buffer_init_time = cdtime ();
 258                         return (0);
 259                 }
 260
 261                 status = format_json_finalize (cb->send_buffer,
 262                                 &cb->send_buffer_fill,
 263                                 &cb->send_buffer_free);
 264                 if (status != 0)
 265                 {
 266                         ERROR ("write_http: wh_flush_nolock: "
 267                                         "format_json_finalize failed.");
 268                         wh_reset_buffer (cb);
 269                         return (status);
 270                 }
 271
 272                 status = wh_send_buffer (cb);
 273                 wh_reset_buffer (cb);
 274         }
 275         else
 276         {
 277                 ERROR ("write_http: wh_flush_nolock: "
 278                                 "Unknown format: %i",
 279                                 cb->format);
 280                 return (-1);
 281         }
 282
 283         return (status);
 284 } /* }}} wh_flush_nolock */
 285
 286 static int wh_flush (cdtime_t timeout, /* {{{ */
 287                 const char *identifier __attribute__((unused)),
 288                 user_data_t *user_data)
 289 {
 290         wh_callback_t *cb;
 291         int status;
 292
 293         if (user_data == NULL)
 294                 return (-EINVAL);
 295
 296         cb = user_data->data;
 297
 298         pthread_mutex_lock (&cb->send_lock);
 299
 300         if (cb->curl == NULL)
 301         {
 302                 status = wh_callback_init (cb);
 303                 if (status != 0)
 304                 {
 305                         ERROR ("write_http plugin: wh_callback_init failed.");
 306                         pthread_mutex_unlock (&cb->send_lock);
 307                         return (-1);
 308                 }
 309         }
 310
 311         status = wh_flush_nolock (timeout, cb);
 312         pthread_mutex_unlock (&cb->send_lock);
 313
 314         return (status);
 315 } /* }}} int wh_flush */
 316
 317 static void wh_callback_free (void *data) /* {{{ */
 318 {
 319         wh_callback_t *cb;
 320
 321         if (data == NULL)
 322                 return;
 323
 324         cb = data;
 325
 326         if (cb->send_buffer != NULL)
 327                 wh_flush_nolock (/* timeout = */ 0, cb);
 328
 329         if (cb->curl != NULL)
 330         {
 331                 curl_easy_cleanup (cb->curl);
 332                 cb->curl = NULL;
 333         }
 334
 335         if (cb->headers != NULL)
 336         {
 337                 curl_slist_free_all (cb->headers);
 338                 cb->headers = NULL;
 339         }
 340
 341         sfree (cb->name);
 342         sfree (cb->location);
 343         sfree (cb->user);
 344         sfree (cb->pass);
 345         sfree (cb->credentials);
 346         sfree (cb->cacert);
 347         sfree (cb->capath);
 348         sfree (cb->clientkey);
 349         sfree (cb->clientcert);
 350         sfree (cb->clientkeypass);
 351         sfree (cb->send_buffer);
 352
 353         sfree (cb);
 354 } /* }}} void wh_callback_free */
 355
 356 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 357                 wh_callback_t *cb)
 358 {
 359         char key[10*DATA_MAX_NAME_LEN];
 360         char values[512];
 361         char command[1024];
 362         size_t command_len;
 363
 364         int status;
 365
 366         if (0 != strcmp (ds->type, vl->type)) {
 367                 ERROR ("write_http plugin: DS type does not match "
 368                                 "value list type");
 369                 return -1;
 370         }
 371
 372         /* Copy the identifier to `key' and escape it. */
 373         status = FORMAT_VL (key, sizeof (key), vl);
 374         if (status != 0) {
 375                 ERROR ("write_http plugin: error with format_name");
 376                 return (status);
 377         }
 378         escape_string (key, sizeof (key));
 379
 380         /* Convert the values to an ASCII representation and put that into
 381          * `values'. */
 382         status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
 383         if (status != 0) {
 384                 ERROR ("write_http plugin: error with "
 385                                 "wh_value_list_to_string");
 386                 return (status);
 387         }
 388
 389         command_len = (size_t) ssnprintf (command, sizeof (command),
 390                         "PUTVAL %s interval=%.3f %s\r\n",
 391                         key,
 392                         CDTIME_T_TO_DOUBLE (vl->interval),
 393                         values);
 394         if (command_len >= sizeof (command)) {
 395                 ERROR ("write_http plugin: Command buffer too small: "
 396                                 "Need %zu bytes.", command_len + 1);
 397                 return (-1);
 398         }
 399
 400         pthread_mutex_lock (&cb->send_lock);
 401
 402         if (cb->curl == NULL)
 403         {
 404                 status = wh_callback_init (cb);
 405                 if (status != 0)
 406                 {
 407                         ERROR ("write_http plugin: wh_callback_init failed.");
 408                         pthread_mutex_unlock (&cb->send_lock);
 409                         return (-1);
 410                 }
 411         }
 412
 413         if (command_len >= cb->send_buffer_free)
 414         {
 415                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 416                 if (status != 0)
 417                 {
 418                         pthread_mutex_unlock (&cb->send_lock);
 419                         return (status);
 420                 }
 421         }
 422         assert (command_len < cb->send_buffer_free);
 423
 424         /* `command_len + 1' because `command_len' does not include the
 425          * trailing null byte. Neither does `send_buffer_fill'. */
 426         memcpy (cb->send_buffer + cb->send_buffer_fill,
 427                         command, command_len + 1);
 428         cb->send_buffer_fill += command_len;
 429         cb->send_buffer_free -= command_len;
 430
 431         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 432                         cb->location,
 433                         cb->send_buffer_fill, cb->send_buffer_size,
 434                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
 435                         command);
 436
 437         /* Check if we have enough space for this command. */
 438         pthread_mutex_unlock (&cb->send_lock);
 439
 440         return (0);
 441 } /* }}} int wh_write_command */
 442
 443 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 444                 wh_callback_t *cb)
 445 {
 446         int status;
 447
 448         pthread_mutex_lock (&cb->send_lock);
 449
 450         if (cb->curl == NULL)
 451         {
 452                 status = wh_callback_init (cb);
 453                 if (status != 0)
 454                 {
 455                         ERROR ("write_http plugin: wh_callback_init failed.");
 456                         pthread_mutex_unlock (&cb->send_lock);
 457                         return (-1);
 458                 }
 459         }
 460
 461         status = format_json_value_list (cb->send_buffer,
 462                         &cb->send_buffer_fill,
 463                         &cb->send_buffer_free,
 464                         ds, vl, cb->store_rates);
 465         if (status == -ENOMEM)
 466         {
 467                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 468                 if (status != 0)
 469                 {
 470                         wh_reset_buffer (cb);
 471                         pthread_mutex_unlock (&cb->send_lock);
 472                         return (status);
 473                 }
 474
 475                 status = format_json_value_list (cb->send_buffer,
 476                                 &cb->send_buffer_fill,
 477                                 &cb->send_buffer_free,
 478                                 ds, vl, cb->store_rates);
 479         }
 480         if (status != 0)
 481         {
 482                 pthread_mutex_unlock (&cb->send_lock);
 483                 return (status);
 484         }
 485
 486         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 487                         cb->location,
 488                         cb->send_buffer_fill, cb->send_buffer_size,
 489                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 490
 491         /* Check if we have enough space for this command. */
 492         pthread_mutex_unlock (&cb->send_lock);
 493
 494         return (0);
 495 } /* }}} int wh_write_json */
 496
 497 static int wh_write_kairosdb (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 498                 wh_callback_t *cb)
 499 {
 500         int status;
 501
 502         pthread_mutex_lock (&cb->send_lock);
 503
 504         if (cb->curl == NULL)
 505         {
 506                 status = wh_callback_init (cb);
 507                 if (status != 0)
 508                 {
 509                         ERROR ("write_http plugin: wh_callback_init failed.");
 510                         pthread_mutex_unlock (&cb->send_lock);
 511                         return (-1);
 512                 }
 513         }
 514
 515         status = format_kairosdb_value_list (cb->send_buffer,
 516                         &cb->send_buffer_fill,
 517                         &cb->send_buffer_free,
 518                         ds, vl, cb->store_rates);
 519         if (status == -ENOMEM)
 520         {
 521                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 522                 if (status != 0)
 523                 {
 524                         wh_reset_buffer (cb);
 525                         pthread_mutex_unlock (&cb->send_lock);
 526                         return (status);
 527                 }
 528
 529                 status = format_kairosdb_value_list (cb->send_buffer,
 530                                 &cb->send_buffer_fill,
 531                                 &cb->send_buffer_free,
 532                                 ds, vl, cb->store_rates);
 533         }
 534         if (status != 0)
 535         {
 536                 pthread_mutex_unlock (&cb->send_lock);
 537                 return (status);
 538         }
 539
 540         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 541                         cb->location,
 542                         cb->send_buffer_fill, cb->send_buffer_size,
 543                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 544
 545         /* Check if we have enough space for this command. */
 546         pthread_mutex_unlock (&cb->send_lock);
 547
 548         return (0);
 549 } /* }}} int wh_write_kairosdb */
 550
 551 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 552                 user_data_t *user_data)
 553 {
 554         wh_callback_t *cb;
 555         int status;
 556
 557         if (user_data == NULL)
 558                 return (-EINVAL);
 559
 560         cb = user_data->data;
 561
 562         switch(cb->format) {
 563             case WH_FORMAT_JSON:
 564                 status = wh_write_json (ds, vl, cb);
 565                 break;
 566             case WH_FORMAT_KAIROSDB:
 567                 status = wh_write_kairosdb (ds, vl, cb);
 568                 break;
 569             default:
 570                 status = wh_write_command (ds, vl, cb);
 571                 break;
 572         }
 573         return (status);
 574 } /* }}} int wh_write */
 575
 576 static int config_set_format (wh_callback_t *cb, /* {{{ */
 577                 oconfig_item_t *ci)
 578 {
 579         char *string;
 580
 581         if ((ci->values_num != 1)
 582                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 583         {
 584                 WARNING ("write_http plugin: The `%s' config option "
 585                                 "needs exactly one string argument.", ci->key);
 586                 return (-1);
 587         }
 588
 589         string = ci->values[0].value.string;
 590         if (strcasecmp ("Command", string) == 0)
 591                 cb->format = WH_FORMAT_COMMAND;
 592         else if (strcasecmp ("JSON", string) == 0)
 593                 cb->format = WH_FORMAT_JSON;
 594         else if (strcasecmp ("KAIROSDB", string) == 0)
 595                 cb->format = WH_FORMAT_KAIROSDB;
 596         else
 597         {
 598                 ERROR ("write_http plugin: Invalid format string: %s",
 599                                 string);
 600                 return (-1);
 601         }
 602
 603         return (0);
 604 } /* }}} int config_set_format */
 605
 606 static int wh_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
 607     oconfig_item_t *ci)
 608 {
 609   struct curl_slist *temp = NULL;
 610   if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
 611   {
 612     WARNING ("write_http plugin: `%s' needs exactly one string argument.", name);
 613     return (-1);
 614   }
 615
 616   temp = curl_slist_append(*dest, ci->values[0].value.string);
 617   if (temp == NULL)
 618     return (-1);
 619
 620   *dest = temp;
 621
 622   return (0);
 623 } /* }}} int wh_config_append_string */
 624
 625 static int wh_config_node (oconfig_item_t *ci) /* {{{ */
 626 {
 627         wh_callback_t *cb;
 628         int buffer_size = 0;
 629         user_data_t user_data = { 0 };
 630         char callback_name[DATA_MAX_NAME_LEN];
 631         int status = 0;
 632
 633         cb = calloc (1, sizeof (*cb));
 634         if (cb == NULL)
 635         {
 636                 ERROR ("write_http plugin: calloc failed.");
 637                 return (-1);
 638         }
 639         cb->verify_peer = 1;
 640         cb->verify_host = 1;
 641         cb->format = WH_FORMAT_COMMAND;
 642         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 643         cb->low_speed_limit = 0;
 644         cb->timeout = 0;
 645         cb->log_http_error = 0;
 646         cb->headers = NULL;
 647
 648
 649         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 650
 651         cf_util_get_string (ci, &cb->name);
 652
 653         /* FIXME: Remove this legacy mode in version 6. */
 654         if (strcasecmp ("URL", ci->key) == 0)
 655                 cf_util_get_string (ci, &cb->location);
 656
 657         for (int i = 0; i < ci->children_num; i++)
 658         {
 659                 oconfig_item_t *child = ci->children + i;
 660
 661                 if (strcasecmp ("URL", child->key) == 0)
 662                         status = cf_util_get_string (child, &cb->location);
 663                 else if (strcasecmp ("User", child->key) == 0)
 664                         status = cf_util_get_string (child, &cb->user);
 665                 else if (strcasecmp ("Password", child->key) == 0)
 666                         status = cf_util_get_string (child, &cb->pass);
 667                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 668                         status = cf_util_get_boolean (child, &cb->verify_peer);
 669                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 670                         status = cf_util_get_boolean (child, &cb->verify_host);
 671                 else if (strcasecmp ("CACert", child->key) == 0)
 672                         status = cf_util_get_string (child, &cb->cacert);
 673                 else if (strcasecmp ("CAPath", child->key) == 0)
 674                         status = cf_util_get_string (child, &cb->capath);
 675                 else if (strcasecmp ("ClientKey", child->key) == 0)
 676                         status = cf_util_get_string (child, &cb->clientkey);
 677                 else if (strcasecmp ("ClientCert", child->key) == 0)
 678                         status = cf_util_get_string (child, &cb->clientcert);
 679                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 680                         status = cf_util_get_string (child, &cb->clientkeypass);
 681                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 682                 {
 683                         char *value = NULL;
 684
 685                         status = cf_util_get_string (child, &value);
 686                         if (status != 0)
 687                                 break;
 688
 689                         if (value == NULL || strcasecmp ("default", value) == 0)
 690                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 691                         else if (strcasecmp ("SSLv2", value) == 0)
 692                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 693                         else if (strcasecmp ("SSLv3", value) == 0)
 694                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 695                         else if (strcasecmp ("TLSv1", value) == 0)
 696                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 697 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 698                         else if (strcasecmp ("TLSv1_0", value) == 0)
 699                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 700                         else if (strcasecmp ("TLSv1_1", value) == 0)
 701                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 702                         else if (strcasecmp ("TLSv1_2", value) == 0)
 703                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 704 #endif
 705                         else
 706                         {
 707                                 ERROR ("write_http plugin: Invalid SSLVersion "
 708                                                 "option: %s.", value);
 709                                 status = EINVAL;
 710                         }
 711
 712                         sfree(value);
 713                 }
 714                 else if (strcasecmp ("Format", child->key) == 0)
 715                         status = config_set_format (cb, child);
 716                 else if (strcasecmp ("StoreRates", child->key) == 0)
 717                         status = cf_util_get_boolean (child, &cb->store_rates);
 718                 else if (strcasecmp ("BufferSize", child->key) == 0)
 719                         status = cf_util_get_int (child, &buffer_size);
 720                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 721                         status = cf_util_get_int (child, &cb->low_speed_limit);
 722                 else if (strcasecmp ("Timeout", child->key) == 0)
 723                         status = cf_util_get_int (child, &cb->timeout);
 724                 else if (strcasecmp ("LogHttpError", child->key) == 0)
 725                         status = cf_util_get_boolean (child, &cb->log_http_error);
 726                 else if (strcasecmp ("Header", child->key) == 0)
 727                         status = wh_config_append_string ("Header", &cb->headers, child);
 728                 else
 729                 {
 730                         ERROR ("write_http plugin: Invalid configuration "
 731                                         "option: %s.", child->key);
 732                         status = EINVAL;
 733                 }
 734
 735                 if (status != 0)
 736                         break;
 737         }
 738
 739         if (status != 0)
 740         {
 741                 wh_callback_free (cb);
 742                 return (status);
 743         }
 744
 745         if (cb->location == NULL)
 746         {
 747                 ERROR ("write_http plugin: no URL defined for instance '%s'",
 748                         cb->name);
 749                 wh_callback_free (cb);
 750                 return (-1);
 751         }
 752
 753         if (cb->low_speed_limit > 0)
 754                 cb->low_speed_time = CDTIME_T_TO_TIME_T(plugin_get_interval());
 755
 756         /* Determine send_buffer_size. */
 757         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 758         if (buffer_size >= 1024)
 759                 cb->send_buffer_size = (size_t) buffer_size;
 760         else if (buffer_size != 0)
 761                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 762                                 buffer_size);
 763
 764         /* Allocate the buffer. */
 765         cb->send_buffer = malloc (cb->send_buffer_size);
 766         if (cb->send_buffer == NULL)
 767         {
 768                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 769                 wh_callback_free (cb);
 770                 return (-1);
 771         }
 772         /* Nulls the buffer and sets ..._free and ..._fill. */
 773         wh_reset_buffer (cb);
 774
 775         ssnprintf (callback_name, sizeof (callback_name), "write_http/%s",
 776                         cb->name);
 777         DEBUG ("write_http: Registering write callback '%s' with URL '%s'",
 778                         callback_name, cb->location);
 779
 780         user_data.data = cb;
 781         plugin_register_flush (callback_name, wh_flush, &user_data);
 782
 783         user_data.free_func = wh_callback_free;
 784         plugin_register_write (callback_name, wh_write, &user_data);
 785
 786         return (0);
 787 } /* }}} int wh_config_node */
 788
 789 static int wh_config (oconfig_item_t *ci) /* {{{ */
 790 {
 791         for (int i = 0; i < ci->children_num; i++)
 792         {
 793                 oconfig_item_t *child = ci->children + i;
 794
 795                 if (strcasecmp ("Node", child->key) == 0)
 796                         wh_config_node (child);
 797                 /* FIXME: Remove this legacy mode in version 6. */
 798                 else if (strcasecmp ("URL", child->key) == 0) {
 799                         WARNING ("write_http plugin: Legacy <URL> block found. "
 800                                 "Please use <Node> instead.");
 801                         wh_config_node (child);
 802                 }
 803                 else
 804                 {
 805                         ERROR ("write_http plugin: Invalid configuration "
 806                                         "option: %s.", child->key);
 807                 }
 808         }
 809
 810         return (0);
 811 } /* }}} int wh_config */
 812
 813 static int wh_init (void) /* {{{ */
 814 {
 815         /* Call this while collectd is still single-threaded to avoid
 816          * initialization issues in libgcrypt. */
 817         curl_global_init (CURL_GLOBAL_SSL);
 818         return (0);
 819 } /* }}} int wh_init */
 820
 821 void module_register (void) /* {{{ */
 822 {
 823         plugin_register_complex_config ("write_http", wh_config);
 824         plugin_register_init ("write_http", wh_init);
 825 } /* }}} void module_register */
 826
 827 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */