src/write_http.c

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