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         _Bool send_metrics;
  69         _Bool send_notifications;
  70
  71         CURL *curl;
  72         struct curl_slist *headers;
  73         char curl_errbuf[CURL_ERROR_SIZE];
  74
  75         char  *send_buffer;
  76         size_t send_buffer_size;
  77         size_t send_buffer_free;
  78         size_t send_buffer_fill;
  79         cdtime_t send_buffer_init_time;
  80
  81         pthread_mutex_t send_lock;
  82 };
  83 typedef struct wh_callback_s wh_callback_t;
  84
  85 static void wh_log_http_error (wh_callback_t *cb)
  86 {
  87         if (!cb->log_http_error)
  88                 return;
  89
  90         long http_code = 0;
  91
  92         curl_easy_getinfo (cb->curl, CURLINFO_RESPONSE_CODE, &http_code);
  93
  94         if (http_code != 200)
  95                 INFO ("write_http plugin: HTTP Error code: %lu", http_code);
  96 }
  97
  98 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
  99 {
 100         if ((cb == NULL) || (cb->send_buffer == NULL))
 101                 return;
 102
 103         memset (cb->send_buffer, 0, cb->send_buffer_size);
 104         cb->send_buffer_free = cb->send_buffer_size;
 105         cb->send_buffer_fill = 0;
 106         cb->send_buffer_init_time = cdtime ();
 107
 108         if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 109         {
 110                 format_json_initialize (cb->send_buffer,
 111                                 &cb->send_buffer_fill,
 112                                 &cb->send_buffer_free);
 113         }
 114 } /* }}} wh_reset_buffer */
 115
 116 /* must hold cb->send_lock when calling */
 117 static int wh_post_nolock (wh_callback_t *cb, char const *data) /* {{{ */
 118 {
 119         int status = 0;
 120
 121         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, data);
 122         status = curl_easy_perform (cb->curl);
 123
 124         wh_log_http_error (cb);
 125
 126         if (status != CURLE_OK)
 127         {
 128                 ERROR ("write_http plugin: curl_easy_perform failed with "
 129                                 "status %i: %s",
 130                                 status, cb->curl_errbuf);
 131         }
 132         return (status);
 133 } /* }}} wh_post_nolock */
 134
 135 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
 136 {
 137         if (cb->curl != NULL)
 138                 return (0);
 139
 140         cb->curl = curl_easy_init ();
 141         if (cb->curl == NULL)
 142         {
 143                 ERROR ("curl plugin: curl_easy_init failed.");
 144                 return (-1);
 145         }
 146
 147         if (cb->low_speed_limit > 0 && cb->low_speed_time > 0)
 148         {
 149                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_LIMIT,
 150                                   (long) (cb->low_speed_limit * cb->low_speed_time));
 151                 curl_easy_setopt (cb->curl, CURLOPT_LOW_SPEED_TIME,
 152                                   (long) cb->low_speed_time);
 153         }
 154
 155 #ifdef HAVE_CURLOPT_TIMEOUT_MS
 156         if (cb->timeout > 0)
 157                 curl_easy_setopt (cb->curl, CURLOPT_TIMEOUT_MS, (long) cb->timeout);
 158 #endif
 159
 160         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
 161         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
 162
 163         cb->headers = curl_slist_append (cb->headers, "Accept:  */*");
 164         if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 165                 cb->headers = curl_slist_append (cb->headers, "Content-Type: application/json");
 166         else
 167                 cb->headers = curl_slist_append (cb->headers, "Content-Type: text/plain");
 168         cb->headers = curl_slist_append (cb->headers, "Expect:");
 169         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, cb->headers);
 170
 171         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
 172         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
 173         curl_easy_setopt (cb->curl, CURLOPT_FOLLOWLOCATION, 1L);
 174         curl_easy_setopt (cb->curl, CURLOPT_MAXREDIRS, 50L);
 175
 176         if (cb->user != NULL)
 177         {
 178 #ifdef HAVE_CURLOPT_USERNAME
 179                 curl_easy_setopt (cb->curl, CURLOPT_USERNAME, cb->user);
 180                 curl_easy_setopt (cb->curl, CURLOPT_PASSWORD,
 181                         (cb->pass == NULL) ? "" : cb->pass);
 182 #else
 183                 size_t credentials_size;
 184
 185                 credentials_size = strlen (cb->user) + 2;
 186                 if (cb->pass != NULL)
 187                         credentials_size += strlen (cb->pass);
 188
 189                 cb->credentials = malloc (credentials_size);
 190                 if (cb->credentials == NULL)
 191                 {
 192                         ERROR ("curl plugin: malloc failed.");
 193                         return (-1);
 194                 }
 195
 196                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
 197                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
 198                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
 199 #endif
 200                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 201         }
 202
 203         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
 204         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
 205                         cb->verify_host ? 2L : 0L);
 206         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
 207         if (cb->cacert != NULL)
 208                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
 209         if (cb->capath != NULL)
 210                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
 211
 212         if (cb->clientkey != NULL && cb->clientcert != NULL)
 213         {
 214             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
 215             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
 216
 217             if (cb->clientkeypass != NULL)
 218                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
 219         }
 220
 221         wh_reset_buffer (cb);
 222
 223         return (0);
 224 } /* }}} int wh_callback_init */
 225
 226 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
 227 {
 228         int status;
 229
 230         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
 231                         "send_buffer_fill = %zu;",
 232                         CDTIME_T_TO_DOUBLE (timeout),
 233                         cb->send_buffer_fill);
 234
 235         /* timeout == 0  => flush unconditionally */
 236         if (timeout > 0)
 237         {
 238                 cdtime_t now;
 239
 240                 now = cdtime ();
 241                 if ((cb->send_buffer_init_time + timeout) > now)
 242                         return (0);
 243         }
 244
 245         if (cb->format == WH_FORMAT_COMMAND)
 246         {
 247                 if (cb->send_buffer_fill == 0)
 248                 {
 249                         cb->send_buffer_init_time = cdtime ();
 250                         return (0);
 251                 }
 252
 253                 status = wh_post_nolock (cb, cb->send_buffer);
 254                 wh_reset_buffer (cb);
 255         }
 256         else if (cb->format == WH_FORMAT_JSON || cb->format == WH_FORMAT_KAIROSDB)
 257         {
 258                 if (cb->send_buffer_fill <= 2)
 259                 {
 260                         cb->send_buffer_init_time = cdtime ();
 261                         return (0);
 262                 }
 263
 264                 status = format_json_finalize (cb->send_buffer,
 265                                 &cb->send_buffer_fill,
 266                                 &cb->send_buffer_free);
 267                 if (status != 0)
 268                 {
 269                         ERROR ("write_http: wh_flush_nolock: "
 270                                         "format_json_finalize failed.");
 271                         wh_reset_buffer (cb);
 272                         return (status);
 273                 }
 274
 275                 status = wh_post_nolock (cb, cb->send_buffer);
 276                 wh_reset_buffer (cb);
 277         }
 278         else
 279         {
 280                 ERROR ("write_http: wh_flush_nolock: "
 281                                 "Unknown format: %i",
 282                                 cb->format);
 283                 return (-1);
 284         }
 285
 286         return (status);
 287 } /* }}} wh_flush_nolock */
 288
 289 static int wh_flush (cdtime_t timeout, /* {{{ */
 290                 const char *identifier __attribute__((unused)),
 291                 user_data_t *user_data)
 292 {
 293         wh_callback_t *cb;
 294         int status;
 295
 296         if (user_data == NULL)
 297                 return (-EINVAL);
 298
 299         cb = user_data->data;
 300
 301         pthread_mutex_lock (&cb->send_lock);
 302
 303         if (wh_callback_init (cb) != 0)
 304         {
 305                 ERROR ("write_http plugin: wh_callback_init failed.");
 306                 pthread_mutex_unlock (&cb->send_lock);
 307                 return (-1);
 308         }
 309
 310         status = wh_flush_nolock (timeout, cb);
 311         pthread_mutex_unlock (&cb->send_lock);
 312
 313         return (status);
 314 } /* }}} int wh_flush */
 315
 316 static void wh_callback_free (void *data) /* {{{ */
 317 {
 318         wh_callback_t *cb;
 319
 320         if (data == NULL)
 321                 return;
 322
 323         cb = data;
 324
 325         if (cb->send_buffer != NULL)
 326                 wh_flush_nolock (/* timeout = */ 0, cb);
 327
 328         if (cb->curl != NULL)
 329         {
 330                 curl_easy_cleanup (cb->curl);
 331                 cb->curl = NULL;
 332         }
 333
 334         if (cb->headers != NULL)
 335         {
 336                 curl_slist_free_all (cb->headers);
 337                 cb->headers = NULL;
 338         }
 339
 340         sfree (cb->name);
 341         sfree (cb->location);
 342         sfree (cb->user);
 343         sfree (cb->pass);
 344         sfree (cb->credentials);
 345         sfree (cb->cacert);
 346         sfree (cb->capath);
 347         sfree (cb->clientkey);
 348         sfree (cb->clientcert);
 349         sfree (cb->clientkeypass);
 350         sfree (cb->send_buffer);
 351
 352         sfree (cb);
 353 } /* }}} void wh_callback_free */
 354
 355 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 356                 wh_callback_t *cb)
 357 {
 358         char key[10*DATA_MAX_NAME_LEN];
 359         char values[512];
 360         char command[1024];
 361         size_t command_len;
 362
 363         int status;
 364
 365         /* sanity checks, primarily to make static analyzers happy. */
 366         if ((cb == NULL) || (cb->send_buffer == NULL))
 367                 return -1;
 368
 369         if (strcmp (ds->type, vl->type) != 0) {
 370                 ERROR ("write_http plugin: DS type does not match "
 371                                 "value list type");
 372                 return -1;
 373         }
 374
 375         /* Copy the identifier to `key' and escape it. */
 376         status = FORMAT_VL (key, sizeof (key), vl);
 377         if (status != 0) {
 378                 ERROR ("write_http plugin: error with format_name");
 379                 return (status);
 380         }
 381         escape_string (key, sizeof (key));
 382
 383         /* Convert the values to an ASCII representation and put that into
 384          * `values'. */
 385         status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
 386         if (status != 0) {
 387                 ERROR ("write_http plugin: error with "
 388                                 "wh_value_list_to_string");
 389                 return (status);
 390         }
 391
 392         command_len = (size_t) ssnprintf (command, sizeof (command),
 393                         "PUTVAL %s interval=%.3f %s\r\n",
 394                         key,
 395                         CDTIME_T_TO_DOUBLE (vl->interval),
 396                         values);
 397         if (command_len >= sizeof (command)) {
 398                 ERROR ("write_http plugin: Command buffer too small: "
 399                                 "Need %zu bytes.", command_len + 1);
 400                 return (-1);
 401         }
 402
 403         pthread_mutex_lock (&cb->send_lock);
 404         if (wh_callback_init (cb) != 0)
 405         {
 406                 ERROR ("write_http plugin: wh_callback_init failed.");
 407                 pthread_mutex_unlock (&cb->send_lock);
 408                 return (-1);
 409         }
 410
 411         if (command_len >= cb->send_buffer_free)
 412         {
 413                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 414                 if (status != 0)
 415                 {
 416                         pthread_mutex_unlock (&cb->send_lock);
 417                         return (status);
 418                 }
 419         }
 420         assert (command_len < cb->send_buffer_free);
 421
 422         /* `command_len + 1' because `command_len' does not include the
 423          * trailing null byte. Neither does `send_buffer_fill'. */
 424         memcpy (cb->send_buffer + cb->send_buffer_fill,
 425                         command, command_len + 1);
 426         cb->send_buffer_fill += command_len;
 427         cb->send_buffer_free -= command_len;
 428
 429         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 430                         cb->location,
 431                         cb->send_buffer_fill, cb->send_buffer_size,
 432                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
 433                         command);
 434
 435         /* Check if we have enough space for this command. */
 436         pthread_mutex_unlock (&cb->send_lock);
 437
 438         return (0);
 439 } /* }}} int wh_write_command */
 440
 441 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 442                 wh_callback_t *cb)
 443 {
 444         int status;
 445
 446         pthread_mutex_lock (&cb->send_lock);
 447         if (wh_callback_init (cb) != 0)
 448         {
 449                 ERROR ("write_http plugin: wh_callback_init failed.");
 450                 pthread_mutex_unlock (&cb->send_lock);
 451                 return (-1);
 452         }
 453
 454         status = format_json_value_list (cb->send_buffer,
 455                         &cb->send_buffer_fill,
 456                         &cb->send_buffer_free,
 457                         ds, vl, cb->store_rates);
 458         if (status == -ENOMEM)
 459         {
 460                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 461                 if (status != 0)
 462                 {
 463                         wh_reset_buffer (cb);
 464                         pthread_mutex_unlock (&cb->send_lock);
 465                         return (status);
 466                 }
 467
 468                 status = format_json_value_list (cb->send_buffer,
 469                                 &cb->send_buffer_fill,
 470                                 &cb->send_buffer_free,
 471                                 ds, vl, cb->store_rates);
 472         }
 473         if (status != 0)
 474         {
 475                 pthread_mutex_unlock (&cb->send_lock);
 476                 return (status);
 477         }
 478
 479         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 480                         cb->location,
 481                         cb->send_buffer_fill, cb->send_buffer_size,
 482                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 483
 484         /* Check if we have enough space for this command. */
 485         pthread_mutex_unlock (&cb->send_lock);
 486
 487         return (0);
 488 } /* }}} int wh_write_json */
 489
 490 static int wh_write_kairosdb (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 491                 wh_callback_t *cb)
 492 {
 493         int status;
 494
 495         pthread_mutex_lock (&cb->send_lock);
 496
 497         if (cb->curl == NULL)
 498         {
 499                 status = wh_callback_init (cb);
 500                 if (status != 0)
 501                 {
 502                         ERROR ("write_http plugin: wh_callback_init failed.");
 503                         pthread_mutex_unlock (&cb->send_lock);
 504                         return (-1);
 505                 }
 506         }
 507
 508         status = format_kairosdb_value_list (cb->send_buffer,
 509                         &cb->send_buffer_fill,
 510                         &cb->send_buffer_free,
 511                         ds, vl, cb->store_rates);
 512         if (status == -ENOMEM)
 513         {
 514                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 515                 if (status != 0)
 516                 {
 517                         wh_reset_buffer (cb);
 518                         pthread_mutex_unlock (&cb->send_lock);
 519                         return (status);
 520                 }
 521
 522                 status = format_kairosdb_value_list (cb->send_buffer,
 523                                 &cb->send_buffer_fill,
 524                                 &cb->send_buffer_free,
 525                                 ds, vl, cb->store_rates);
 526         }
 527         if (status != 0)
 528         {
 529                 pthread_mutex_unlock (&cb->send_lock);
 530                 return (status);
 531         }
 532
 533         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 534                         cb->location,
 535                         cb->send_buffer_fill, cb->send_buffer_size,
 536                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size));
 537
 538         /* Check if we have enough space for this command. */
 539         pthread_mutex_unlock (&cb->send_lock);
 540
 541         return (0);
 542 } /* }}} int wh_write_kairosdb */
 543
 544 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 545                 user_data_t *user_data)
 546 {
 547         wh_callback_t *cb;
 548         int status;
 549
 550         if (user_data == NULL)
 551                 return (-EINVAL);
 552
 553         cb = user_data->data;
 554         assert (cb->send_metrics);
 555
 556         switch(cb->format) {
 557             case WH_FORMAT_JSON:
 558                 status = wh_write_json (ds, vl, cb);
 559                 break;
 560             case WH_FORMAT_KAIROSDB:
 561                 status = wh_write_kairosdb (ds, vl, cb);
 562                 break;
 563             default:
 564                 status = wh_write_command (ds, vl, cb);
 565                 break;
 566         }
 567         return (status);
 568 } /* }}} int wh_write */
 569
 570 static int wh_notify (notification_t const *n, user_data_t *ud) /* {{{ */
 571 {
 572         wh_callback_t *cb;
 573         char alert[4096];
 574         int status;
 575
 576         if ((ud == NULL) || (ud->data == NULL))
 577                 return (EINVAL);
 578
 579         cb = ud->data;
 580         assert (cb->send_notifications);
 581
 582         status = format_json_notification (alert, sizeof (alert), n);
 583         if (status != 0)
 584         {
 585                 ERROR ("write_http plugin: formatting notification failed");
 586                 return status;
 587         }
 588
 589         pthread_mutex_lock (&cb->send_lock);
 590         if (wh_callback_init (cb) != 0)
 591         {
 592                 ERROR ("write_http plugin: wh_callback_init failed.");
 593                 pthread_mutex_unlock (&cb->send_lock);
 594                 return (-1);
 595         }
 596
 597         status = wh_post_nolock (cb, alert);
 598         pthread_mutex_unlock (&cb->send_lock);
 599
 600         return (status);
 601 } /* }}} int wh_notify */
 602
 603 static int config_set_format (wh_callback_t *cb, /* {{{ */
 604                 oconfig_item_t *ci)
 605 {
 606         char *string;
 607
 608         if ((ci->values_num != 1)
 609                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 610         {
 611                 WARNING ("write_http plugin: The `%s' config option "
 612                                 "needs exactly one string argument.", ci->key);
 613                 return (-1);
 614         }
 615
 616         string = ci->values[0].value.string;
 617         if (strcasecmp ("Command", string) == 0)
 618                 cb->format = WH_FORMAT_COMMAND;
 619         else if (strcasecmp ("JSON", string) == 0)
 620                 cb->format = WH_FORMAT_JSON;
 621         else if (strcasecmp ("KAIROSDB", string) == 0)
 622                 cb->format = WH_FORMAT_KAIROSDB;
 623         else
 624         {
 625                 ERROR ("write_http plugin: Invalid format string: %s",
 626                                 string);
 627                 return (-1);
 628         }
 629
 630         return (0);
 631 } /* }}} int config_set_format */
 632
 633 static int wh_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
 634     oconfig_item_t *ci)
 635 {
 636   struct curl_slist *temp = NULL;
 637   if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
 638   {
 639     WARNING ("write_http plugin: `%s' needs exactly one string argument.", name);
 640     return (-1);
 641   }
 642
 643   temp = curl_slist_append(*dest, ci->values[0].value.string);
 644   if (temp == NULL)
 645     return (-1);
 646
 647   *dest = temp;
 648
 649   return (0);
 650 } /* }}} int wh_config_append_string */
 651
 652 static int wh_config_node (oconfig_item_t *ci) /* {{{ */
 653 {
 654         wh_callback_t *cb;
 655         int buffer_size = 0;
 656         char callback_name[DATA_MAX_NAME_LEN];
 657         int status = 0;
 658
 659         cb = calloc (1, sizeof (*cb));
 660         if (cb == NULL)
 661         {
 662                 ERROR ("write_http plugin: calloc failed.");
 663                 return (-1);
 664         }
 665         cb->verify_peer = 1;
 666         cb->verify_host = 1;
 667         cb->format = WH_FORMAT_COMMAND;
 668         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 669         cb->low_speed_limit = 0;
 670         cb->timeout = 0;
 671         cb->log_http_error = 0;
 672         cb->headers = NULL;
 673         cb->send_metrics = 1;
 674         cb->send_notifications = 0;
 675
 676         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 677
 678         cf_util_get_string (ci, &cb->name);
 679
 680         /* FIXME: Remove this legacy mode in version 6. */
 681         if (strcasecmp ("URL", ci->key) == 0)
 682                 cf_util_get_string (ci, &cb->location);
 683
 684         for (int i = 0; i < ci->children_num; i++)
 685         {
 686                 oconfig_item_t *child = ci->children + i;
 687
 688                 if (strcasecmp ("URL", child->key) == 0)
 689                         status = cf_util_get_string (child, &cb->location);
 690                 else if (strcasecmp ("User", child->key) == 0)
 691                         status = cf_util_get_string (child, &cb->user);
 692                 else if (strcasecmp ("Password", child->key) == 0)
 693                         status = cf_util_get_string (child, &cb->pass);
 694                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 695                         status = cf_util_get_boolean (child, &cb->verify_peer);
 696                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 697                         status = cf_util_get_boolean (child, &cb->verify_host);
 698                 else if (strcasecmp ("CACert", child->key) == 0)
 699                         status = cf_util_get_string (child, &cb->cacert);
 700                 else if (strcasecmp ("CAPath", child->key) == 0)
 701                         status = cf_util_get_string (child, &cb->capath);
 702                 else if (strcasecmp ("ClientKey", child->key) == 0)
 703                         status = cf_util_get_string (child, &cb->clientkey);
 704                 else if (strcasecmp ("ClientCert", child->key) == 0)
 705                         status = cf_util_get_string (child, &cb->clientcert);
 706                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 707                         status = cf_util_get_string (child, &cb->clientkeypass);
 708                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 709                 {
 710                         char *value = NULL;
 711
 712                         status = cf_util_get_string (child, &value);
 713                         if (status != 0)
 714                                 break;
 715
 716                         if (value == NULL || strcasecmp ("default", value) == 0)
 717                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 718                         else if (strcasecmp ("SSLv2", value) == 0)
 719                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 720                         else if (strcasecmp ("SSLv3", value) == 0)
 721                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 722                         else if (strcasecmp ("TLSv1", value) == 0)
 723                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 724 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 725                         else if (strcasecmp ("TLSv1_0", value) == 0)
 726                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 727                         else if (strcasecmp ("TLSv1_1", value) == 0)
 728                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 729                         else if (strcasecmp ("TLSv1_2", value) == 0)
 730                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 731 #endif
 732                         else
 733                         {
 734                                 ERROR ("write_http plugin: Invalid SSLVersion "
 735                                                 "option: %s.", value);
 736                                 status = EINVAL;
 737                         }
 738
 739                         sfree(value);
 740                 }
 741                 else if (strcasecmp ("Format", child->key) == 0)
 742                         status = config_set_format (cb, child);
 743                 else if (strcasecmp ("Metrics", child->key) == 0)
 744                         cf_util_get_boolean (child, &cb->send_metrics);
 745                 else if (strcasecmp ("Notifications", child->key) == 0)
 746                         cf_util_get_boolean (child, &cb->send_notifications);
 747                 else if (strcasecmp ("StoreRates", child->key) == 0)
 748                         status = cf_util_get_boolean (child, &cb->store_rates);
 749                 else if (strcasecmp ("BufferSize", child->key) == 0)
 750                         status = cf_util_get_int (child, &buffer_size);
 751                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 752                         status = cf_util_get_int (child, &cb->low_speed_limit);
 753                 else if (strcasecmp ("Timeout", child->key) == 0)
 754                         status = cf_util_get_int (child, &cb->timeout);
 755                 else if (strcasecmp ("LogHttpError", child->key) == 0)
 756                         status = cf_util_get_boolean (child, &cb->log_http_error);
 757                 else if (strcasecmp ("Header", child->key) == 0)
 758                         status = wh_config_append_string ("Header", &cb->headers, child);
 759                 else
 760                 {
 761                         ERROR ("write_http plugin: Invalid configuration "
 762                                         "option: %s.", child->key);
 763                         status = EINVAL;
 764                 }
 765
 766                 if (status != 0)
 767                         break;
 768         }
 769
 770         if (status != 0)
 771         {
 772                 wh_callback_free (cb);
 773                 return (status);
 774         }
 775
 776         if (cb->location == NULL)
 777         {
 778                 ERROR ("write_http plugin: no URL defined for instance '%s'",
 779                         cb->name);
 780                 wh_callback_free (cb);
 781                 return (-1);
 782         }
 783
 784         if (!cb->send_metrics && !cb->send_notifications)
 785         {
 786                 ERROR ("write_http plugin: Neither metrics nor notifications "
 787                        "are enabled for \"%s\".", cb->name);
 788                 wh_callback_free (cb);
 789                 return (-1);
 790         }
 791
 792         if (cb->low_speed_limit > 0)
 793                 cb->low_speed_time = CDTIME_T_TO_TIME_T(plugin_get_interval());
 794
 795         /* Determine send_buffer_size. */
 796         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 797         if (buffer_size >= 1024)
 798                 cb->send_buffer_size = (size_t) buffer_size;
 799         else if (buffer_size != 0)
 800                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 801                                 buffer_size);
 802
 803         /* Allocate the buffer. */
 804         cb->send_buffer = malloc (cb->send_buffer_size);
 805         if (cb->send_buffer == NULL)
 806         {
 807                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 808                 wh_callback_free (cb);
 809                 return (-1);
 810         }
 811         /* Nulls the buffer and sets ..._free and ..._fill. */
 812         wh_reset_buffer (cb);
 813
 814         ssnprintf (callback_name, sizeof (callback_name), "write_http/%s",
 815                         cb->name);
 816         DEBUG ("write_http: Registering write callback '%s' with URL '%s'",
 817                         callback_name, cb->location);
 818
 819         user_data_t user_data = {
 820                 .data = cb,
 821                 .free_func = wh_callback_free,
 822         };
 823
 824         if (cb->send_metrics)
 825         {
 826                 plugin_register_write (callback_name, wh_write, &user_data);
 827                 user_data.free_func = NULL;
 828
 829                 plugin_register_flush (callback_name, wh_flush, &user_data);
 830         }
 831
 832         if (cb->send_notifications)
 833         {
 834                 plugin_register_notification (callback_name, wh_notify, &user_data);
 835                 user_data.free_func = NULL;
 836         }
 837
 838         return (0);
 839 } /* }}} int wh_config_node */
 840
 841 static int wh_config (oconfig_item_t *ci) /* {{{ */
 842 {
 843         for (int i = 0; i < ci->children_num; i++)
 844         {
 845                 oconfig_item_t *child = ci->children + i;
 846
 847                 if (strcasecmp ("Node", child->key) == 0)
 848                         wh_config_node (child);
 849                 /* FIXME: Remove this legacy mode in version 6. */
 850                 else if (strcasecmp ("URL", child->key) == 0) {
 851                         WARNING ("write_http plugin: Legacy <URL> block found. "
 852                                 "Please use <Node> instead.");
 853                         wh_config_node (child);
 854                 }
 855                 else
 856                 {
 857                         ERROR ("write_http plugin: Invalid configuration "
 858                                         "option: %s.", child->key);
 859                 }
 860         }
 861
 862         return (0);
 863 } /* }}} int wh_config */
 864
 865 static int wh_init (void) /* {{{ */
 866 {
 867         /* Call this while collectd is still single-threaded to avoid
 868          * initialization issues in libgcrypt. */
 869         curl_global_init (CURL_GLOBAL_SSL);
 870         return (0);
 871 } /* }}} int wh_init */
 872
 873 void module_register (void) /* {{{ */
 874 {
 875         plugin_register_complex_config ("write_http", wh_config);
 876         plugin_register_init ("write_http", wh_init);
 877 } /* }}} void module_register */
 878
 879 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */