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