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         /* Make scan-build happy. */
 423         assert (cb->send_buffer != NULL);
 424
 425         /* `command_len + 1' because `command_len' does not include the
 426          * trailing null byte. Neither does `send_buffer_fill'. */
 427         memcpy (cb->send_buffer + cb->send_buffer_fill,
 428                         command, command_len + 1);
 429         cb->send_buffer_fill += command_len;
 430         cb->send_buffer_free -= command_len;
 431
 432         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 433                         cb->location,
 434                         cb->send_buffer_fill, cb->send_buffer_size,
 435                         100.0 * ((double) cb->send_buffer_fill) / ((double) cb->send_buffer_size),
 436                         command);
 437
 438         /* Check if we have enough space for this command. */
 439         pthread_mutex_unlock (&cb->send_lock);
 440
 441         return (0);
 442 } /* }}} int wh_write_command */
 443
 444 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 445                 wh_callback_t *cb)
 446 {
 447         int status;
 448
 449         pthread_mutex_lock (&cb->send_lock);
 450         if (wh_callback_init (cb) != 0)
 451         {
 452                 ERROR ("write_http plugin: wh_callback_init failed.");
 453                 pthread_mutex_unlock (&cb->send_lock);
 454                 return (-1);
 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         assert (cb->send_metrics);
 558
 559         switch(cb->format) {
 560             case WH_FORMAT_JSON:
 561                 status = wh_write_json (ds, vl, cb);
 562                 break;
 563             case WH_FORMAT_KAIROSDB:
 564                 status = wh_write_kairosdb (ds, vl, cb);
 565                 break;
 566             default:
 567                 status = wh_write_command (ds, vl, cb);
 568                 break;
 569         }
 570         return (status);
 571 } /* }}} int wh_write */
 572
 573 static int wh_notify (notification_t const *n, user_data_t *ud) /* {{{ */
 574 {
 575         wh_callback_t *cb;
 576         char alert[4096];
 577         int status;
 578
 579         if ((ud == NULL) || (ud->data == NULL))
 580                 return (EINVAL);
 581
 582         cb = ud->data;
 583         assert (cb->send_notifications);
 584
 585         status = format_json_notification (alert, sizeof (alert), n);
 586         if (status != 0)
 587         {
 588                 ERROR ("write_http plugin: formatting notification failed");
 589                 return status;
 590         }
 591
 592         pthread_mutex_lock (&cb->send_lock);
 593         if (wh_callback_init (cb) != 0)
 594         {
 595                 ERROR ("write_http plugin: wh_callback_init failed.");
 596                 pthread_mutex_unlock (&cb->send_lock);
 597                 return (-1);
 598         }
 599
 600         status = wh_post_nolock (cb, alert);
 601         pthread_mutex_unlock (&cb->send_lock);
 602
 603         return (status);
 604 } /* }}} int wh_notify */
 605
 606 static int config_set_format (wh_callback_t *cb, /* {{{ */
 607                 oconfig_item_t *ci)
 608 {
 609         char *string;
 610
 611         if ((ci->values_num != 1)
 612                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 613         {
 614                 WARNING ("write_http plugin: The `%s' config option "
 615                                 "needs exactly one string argument.", ci->key);
 616                 return (-1);
 617         }
 618
 619         string = ci->values[0].value.string;
 620         if (strcasecmp ("Command", string) == 0)
 621                 cb->format = WH_FORMAT_COMMAND;
 622         else if (strcasecmp ("JSON", string) == 0)
 623                 cb->format = WH_FORMAT_JSON;
 624         else if (strcasecmp ("KAIROSDB", string) == 0)
 625                 cb->format = WH_FORMAT_KAIROSDB;
 626         else
 627         {
 628                 ERROR ("write_http plugin: Invalid format string: %s",
 629                                 string);
 630                 return (-1);
 631         }
 632
 633         return (0);
 634 } /* }}} int config_set_format */
 635
 636 static int wh_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
 637     oconfig_item_t *ci)
 638 {
 639   struct curl_slist *temp = NULL;
 640   if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
 641   {
 642     WARNING ("write_http plugin: `%s' needs exactly one string argument.", name);
 643     return (-1);
 644   }
 645
 646   temp = curl_slist_append(*dest, ci->values[0].value.string);
 647   if (temp == NULL)
 648     return (-1);
 649
 650   *dest = temp;
 651
 652   return (0);
 653 } /* }}} int wh_config_append_string */
 654
 655 static int wh_config_node (oconfig_item_t *ci) /* {{{ */
 656 {
 657         wh_callback_t *cb;
 658         int buffer_size = 0;
 659         char callback_name[DATA_MAX_NAME_LEN];
 660         int status = 0;
 661
 662         cb = calloc (1, sizeof (*cb));
 663         if (cb == NULL)
 664         {
 665                 ERROR ("write_http plugin: calloc failed.");
 666                 return (-1);
 667         }
 668         cb->verify_peer = 1;
 669         cb->verify_host = 1;
 670         cb->format = WH_FORMAT_COMMAND;
 671         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 672         cb->low_speed_limit = 0;
 673         cb->timeout = 0;
 674         cb->log_http_error = 0;
 675         cb->headers = NULL;
 676         cb->send_metrics = 1;
 677         cb->send_notifications = 0;
 678
 679         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 680
 681         cf_util_get_string (ci, &cb->name);
 682
 683         /* FIXME: Remove this legacy mode in version 6. */
 684         if (strcasecmp ("URL", ci->key) == 0)
 685                 cf_util_get_string (ci, &cb->location);
 686
 687         for (int i = 0; i < ci->children_num; i++)
 688         {
 689                 oconfig_item_t *child = ci->children + i;
 690
 691                 if (strcasecmp ("URL", child->key) == 0)
 692                         status = cf_util_get_string (child, &cb->location);
 693                 else if (strcasecmp ("User", child->key) == 0)
 694                         status = cf_util_get_string (child, &cb->user);
 695                 else if (strcasecmp ("Password", child->key) == 0)
 696                         status = cf_util_get_string (child, &cb->pass);
 697                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 698                         status = cf_util_get_boolean (child, &cb->verify_peer);
 699                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 700                         status = cf_util_get_boolean (child, &cb->verify_host);
 701                 else if (strcasecmp ("CACert", child->key) == 0)
 702                         status = cf_util_get_string (child, &cb->cacert);
 703                 else if (strcasecmp ("CAPath", child->key) == 0)
 704                         status = cf_util_get_string (child, &cb->capath);
 705                 else if (strcasecmp ("ClientKey", child->key) == 0)
 706                         status = cf_util_get_string (child, &cb->clientkey);
 707                 else if (strcasecmp ("ClientCert", child->key) == 0)
 708                         status = cf_util_get_string (child, &cb->clientcert);
 709                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 710                         status = cf_util_get_string (child, &cb->clientkeypass);
 711                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 712                 {
 713                         char *value = NULL;
 714
 715                         status = cf_util_get_string (child, &value);
 716                         if (status != 0)
 717                                 break;
 718
 719                         if (value == NULL || strcasecmp ("default", value) == 0)
 720                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 721                         else if (strcasecmp ("SSLv2", value) == 0)
 722                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 723                         else if (strcasecmp ("SSLv3", value) == 0)
 724                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 725                         else if (strcasecmp ("TLSv1", value) == 0)
 726                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 727 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 728                         else if (strcasecmp ("TLSv1_0", value) == 0)
 729                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 730                         else if (strcasecmp ("TLSv1_1", value) == 0)
 731                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 732                         else if (strcasecmp ("TLSv1_2", value) == 0)
 733                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 734 #endif
 735                         else
 736                         {
 737                                 ERROR ("write_http plugin: Invalid SSLVersion "
 738                                                 "option: %s.", value);
 739                                 status = EINVAL;
 740                         }
 741
 742                         sfree(value);
 743                 }
 744                 else if (strcasecmp ("Format", child->key) == 0)
 745                         status = config_set_format (cb, child);
 746                 else if (strcasecmp ("Metrics", child->key) == 0)
 747                         cf_util_get_boolean (child, &cb->send_metrics);
 748                 else if (strcasecmp ("Notifications", child->key) == 0)
 749                         cf_util_get_boolean (child, &cb->send_notifications);
 750                 else if (strcasecmp ("StoreRates", child->key) == 0)
 751                         status = cf_util_get_boolean (child, &cb->store_rates);
 752                 else if (strcasecmp ("BufferSize", child->key) == 0)
 753                         status = cf_util_get_int (child, &buffer_size);
 754                 else if (strcasecmp ("LowSpeedLimit", child->key) == 0)
 755                         status = cf_util_get_int (child, &cb->low_speed_limit);
 756                 else if (strcasecmp ("Timeout", child->key) == 0)
 757                         status = cf_util_get_int (child, &cb->timeout);
 758                 else if (strcasecmp ("LogHttpError", child->key) == 0)
 759                         status = cf_util_get_boolean (child, &cb->log_http_error);
 760                 else if (strcasecmp ("Header", child->key) == 0)
 761                         status = wh_config_append_string ("Header", &cb->headers, child);
 762                 else
 763                 {
 764                         ERROR ("write_http plugin: Invalid configuration "
 765                                         "option: %s.", child->key);
 766                         status = EINVAL;
 767                 }
 768
 769                 if (status != 0)
 770                         break;
 771         }
 772
 773         if (status != 0)
 774         {
 775                 wh_callback_free (cb);
 776                 return (status);
 777         }
 778
 779         if (cb->location == NULL)
 780         {
 781                 ERROR ("write_http plugin: no URL defined for instance '%s'",
 782                         cb->name);
 783                 wh_callback_free (cb);
 784                 return (-1);
 785         }
 786
 787         if (!cb->send_metrics && !cb->send_notifications)
 788         {
 789                 ERROR ("write_http plugin: Neither metrics nor notifications "
 790                        "are enabled for \"%s\".", cb->name);
 791                 wh_callback_free (cb);
 792                 return (-1);
 793         }
 794
 795         if (cb->low_speed_limit > 0)
 796                 cb->low_speed_time = CDTIME_T_TO_TIME_T(plugin_get_interval());
 797
 798         /* Determine send_buffer_size. */
 799         cb->send_buffer_size = WRITE_HTTP_DEFAULT_BUFFER_SIZE;
 800         if (buffer_size >= 1024)
 801                 cb->send_buffer_size = (size_t) buffer_size;
 802         else if (buffer_size != 0)
 803                 ERROR ("write_http plugin: Ignoring invalid BufferSize setting (%d).",
 804                                 buffer_size);
 805
 806         /* Allocate the buffer. */
 807         cb->send_buffer = malloc (cb->send_buffer_size);
 808         if (cb->send_buffer == NULL)
 809         {
 810                 ERROR ("write_http plugin: malloc(%zu) failed.", cb->send_buffer_size);
 811                 wh_callback_free (cb);
 812                 return (-1);
 813         }
 814         /* Nulls the buffer and sets ..._free and ..._fill. */
 815         wh_reset_buffer (cb);
 816
 817         ssnprintf (callback_name, sizeof (callback_name), "write_http/%s",
 818                         cb->name);
 819         DEBUG ("write_http: Registering write callback '%s' with URL '%s'",
 820                         callback_name, cb->location);
 821
 822         user_data_t user_data = {
 823                 .data = cb,
 824                 .free_func = wh_callback_free,
 825         };
 826
 827         if (cb->send_metrics)
 828         {
 829                 plugin_register_write (callback_name, wh_write, &user_data);
 830                 user_data.free_func = NULL;
 831
 832                 plugin_register_flush (callback_name, wh_flush, &user_data);
 833         }
 834
 835         if (cb->send_notifications)
 836         {
 837                 plugin_register_notification (callback_name, wh_notify, &user_data);
 838                 user_data.free_func = NULL;
 839         }
 840
 841         return (0);
 842 } /* }}} int wh_config_node */
 843
 844 static int wh_config (oconfig_item_t *ci) /* {{{ */
 845 {
 846         for (int i = 0; i < ci->children_num; i++)
 847         {
 848                 oconfig_item_t *child = ci->children + i;
 849
 850                 if (strcasecmp ("Node", child->key) == 0)
 851                         wh_config_node (child);
 852                 /* FIXME: Remove this legacy mode in version 6. */
 853                 else if (strcasecmp ("URL", child->key) == 0) {
 854                         WARNING ("write_http plugin: Legacy <URL> block found. "
 855                                 "Please use <Node> instead.");
 856                         wh_config_node (child);
 857                 }
 858                 else
 859                 {
 860                         ERROR ("write_http plugin: Invalid configuration "
 861                                         "option: %s.", child->key);
 862                 }
 863         }
 864
 865         return (0);
 866 } /* }}} int wh_config */
 867
 868 static int wh_init (void) /* {{{ */
 869 {
 870         /* Call this while collectd is still single-threaded to avoid
 871          * initialization issues in libgcrypt. */
 872         curl_global_init (CURL_GLOBAL_SSL);
 873         return (0);
 874 } /* }}} int wh_init */
 875
 876 void module_register (void) /* {{{ */
 877 {
 878         plugin_register_complex_config ("write_http", wh_config);
 879         plugin_register_init ("write_http", wh_init);
 880 } /* }}} void module_register */
 881
 882 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */