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) 2007-2009  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_parse_option.h"
  31 #include "utils_format_json.h"
  32
  33 #if HAVE_PTHREAD_H
  34 # include <pthread.h>
  35 #endif
  36
  37 #include <curl/curl.h>
  38
  39 /*
  40  * Private variables
  41  */
  42 struct wh_callback_s
  43 {
  44         char *location;
  45
  46         char *user;
  47         char *pass;
  48         char *credentials;
  49         _Bool verify_peer;
  50         _Bool verify_host;
  51         char *cacert;
  52         char *capath;
  53         char *clientkey;
  54         char *clientcert;
  55         char *clientkeypass;
  56         long sslversion;
  57         _Bool store_rates;
  58
  59 #define WH_FORMAT_COMMAND 0
  60 #define WH_FORMAT_JSON    1
  61         int format;
  62
  63         CURL *curl;
  64         char curl_errbuf[CURL_ERROR_SIZE];
  65
  66         char   send_buffer[4096];
  67         size_t send_buffer_free;
  68         size_t send_buffer_fill;
  69         cdtime_t send_buffer_init_time;
  70
  71         pthread_mutex_t send_lock;
  72 };
  73 typedef struct wh_callback_s wh_callback_t;
  74
  75 static void wh_reset_buffer (wh_callback_t *cb)  /* {{{ */
  76 {
  77         memset (cb->send_buffer, 0, sizeof (cb->send_buffer));
  78         cb->send_buffer_free = sizeof (cb->send_buffer);
  79         cb->send_buffer_fill = 0;
  80         cb->send_buffer_init_time = cdtime ();
  81
  82         if (cb->format == WH_FORMAT_JSON)
  83         {
  84                 format_json_initialize (cb->send_buffer,
  85                                 &cb->send_buffer_fill,
  86                                 &cb->send_buffer_free);
  87         }
  88 } /* }}} wh_reset_buffer */
  89
  90 static int wh_send_buffer (wh_callback_t *cb) /* {{{ */
  91 {
  92         int status = 0;
  93
  94         curl_easy_setopt (cb->curl, CURLOPT_POSTFIELDS, cb->send_buffer);
  95         status = curl_easy_perform (cb->curl);
  96         if (status != CURLE_OK)
  97         {
  98                 ERROR ("write_http plugin: curl_easy_perform failed with "
  99                                 "status %i: %s",
 100                                 status, cb->curl_errbuf);
 101         }
 102         return (status);
 103 } /* }}} wh_send_buffer */
 104
 105 static int wh_callback_init (wh_callback_t *cb) /* {{{ */
 106 {
 107         struct curl_slist *headers;
 108
 109         if (cb->curl != NULL)
 110                 return (0);
 111
 112         cb->curl = curl_easy_init ();
 113         if (cb->curl == NULL)
 114         {
 115                 ERROR ("curl plugin: curl_easy_init failed.");
 116                 return (-1);
 117         }
 118
 119         curl_easy_setopt (cb->curl, CURLOPT_NOSIGNAL, 1L);
 120         curl_easy_setopt (cb->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
 121
 122         headers = NULL;
 123         headers = curl_slist_append (headers, "Accept:  */*");
 124         if (cb->format == WH_FORMAT_JSON)
 125                 headers = curl_slist_append (headers, "Content-Type: application/json");
 126         else
 127                 headers = curl_slist_append (headers, "Content-Type: text/plain");
 128         headers = curl_slist_append (headers, "Expect:");
 129         curl_easy_setopt (cb->curl, CURLOPT_HTTPHEADER, headers);
 130
 131         curl_easy_setopt (cb->curl, CURLOPT_ERRORBUFFER, cb->curl_errbuf);
 132         curl_easy_setopt (cb->curl, CURLOPT_URL, cb->location);
 133
 134         if (cb->user != NULL)
 135         {
 136                 size_t credentials_size;
 137
 138                 credentials_size = strlen (cb->user) + 2;
 139                 if (cb->pass != NULL)
 140                         credentials_size += strlen (cb->pass);
 141
 142                 cb->credentials = (char *) malloc (credentials_size);
 143                 if (cb->credentials == NULL)
 144                 {
 145                         ERROR ("curl plugin: malloc failed.");
 146                         return (-1);
 147                 }
 148
 149                 ssnprintf (cb->credentials, credentials_size, "%s:%s",
 150                                 cb->user, (cb->pass == NULL) ? "" : cb->pass);
 151                 curl_easy_setopt (cb->curl, CURLOPT_USERPWD, cb->credentials);
 152                 curl_easy_setopt (cb->curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 153         }
 154
 155         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYPEER, (long) cb->verify_peer);
 156         curl_easy_setopt (cb->curl, CURLOPT_SSL_VERIFYHOST,
 157                         cb->verify_host ? 2L : 0L);
 158         curl_easy_setopt (cb->curl, CURLOPT_SSLVERSION, cb->sslversion);
 159         if (cb->cacert != NULL)
 160                 curl_easy_setopt (cb->curl, CURLOPT_CAINFO, cb->cacert);
 161         if (cb->capath != NULL)
 162                 curl_easy_setopt (cb->curl, CURLOPT_CAPATH, cb->capath);
 163
 164         if (cb->clientkey != NULL && cb->clientcert != NULL)
 165         {
 166             curl_easy_setopt (cb->curl, CURLOPT_SSLKEY, cb->clientkey);
 167             curl_easy_setopt (cb->curl, CURLOPT_SSLCERT, cb->clientcert);
 168
 169             if (cb->clientkeypass != NULL)
 170                 curl_easy_setopt (cb->curl, CURLOPT_SSLKEYPASSWD, cb->clientkeypass);
 171         }
 172
 173         wh_reset_buffer (cb);
 174
 175         return (0);
 176 } /* }}} int wh_callback_init */
 177
 178 static int wh_flush_nolock (cdtime_t timeout, wh_callback_t *cb) /* {{{ */
 179 {
 180         int status;
 181
 182         DEBUG ("write_http plugin: wh_flush_nolock: timeout = %.3f; "
 183                         "send_buffer_fill = %zu;",
 184                         CDTIME_T_TO_DOUBLE (timeout),
 185                         cb->send_buffer_fill);
 186
 187         /* timeout == 0  => flush unconditionally */
 188         if (timeout > 0)
 189         {
 190                 cdtime_t now;
 191
 192                 now = cdtime ();
 193                 if ((cb->send_buffer_init_time + timeout) > now)
 194                         return (0);
 195         }
 196
 197         if (cb->format == WH_FORMAT_COMMAND)
 198         {
 199                 if (cb->send_buffer_fill <= 0)
 200                 {
 201                         cb->send_buffer_init_time = cdtime ();
 202                         return (0);
 203                 }
 204
 205                 status = wh_send_buffer (cb);
 206                 wh_reset_buffer (cb);
 207         }
 208         else if (cb->format == WH_FORMAT_JSON)
 209         {
 210                 if (cb->send_buffer_fill <= 2)
 211                 {
 212                         cb->send_buffer_init_time = cdtime ();
 213                         return (0);
 214                 }
 215
 216                 status = format_json_finalize (cb->send_buffer,
 217                                 &cb->send_buffer_fill,
 218                                 &cb->send_buffer_free);
 219                 if (status != 0)
 220                 {
 221                         ERROR ("write_http: wh_flush_nolock: "
 222                                         "format_json_finalize failed.");
 223                         wh_reset_buffer (cb);
 224                         return (status);
 225                 }
 226
 227                 status = wh_send_buffer (cb);
 228                 wh_reset_buffer (cb);
 229         }
 230         else
 231         {
 232                 ERROR ("write_http: wh_flush_nolock: "
 233                                 "Unknown format: %i",
 234                                 cb->format);
 235                 return (-1);
 236         }
 237
 238         return (status);
 239 } /* }}} wh_flush_nolock */
 240
 241 static int wh_flush (cdtime_t timeout, /* {{{ */
 242                 const char *identifier __attribute__((unused)),
 243                 user_data_t *user_data)
 244 {
 245         wh_callback_t *cb;
 246         int status;
 247
 248         if (user_data == NULL)
 249                 return (-EINVAL);
 250
 251         cb = user_data->data;
 252
 253         pthread_mutex_lock (&cb->send_lock);
 254
 255         if (cb->curl == NULL)
 256         {
 257                 status = wh_callback_init (cb);
 258                 if (status != 0)
 259                 {
 260                         ERROR ("write_http plugin: wh_callback_init failed.");
 261                         pthread_mutex_unlock (&cb->send_lock);
 262                         return (-1);
 263                 }
 264         }
 265
 266         status = wh_flush_nolock (timeout, cb);
 267         pthread_mutex_unlock (&cb->send_lock);
 268
 269         return (status);
 270 } /* }}} int wh_flush */
 271
 272 static void wh_callback_free (void *data) /* {{{ */
 273 {
 274         wh_callback_t *cb;
 275
 276         if (data == NULL)
 277                 return;
 278
 279         cb = data;
 280
 281         wh_flush_nolock (/* timeout = */ 0, cb);
 282
 283         curl_easy_cleanup (cb->curl);
 284         sfree (cb->location);
 285         sfree (cb->user);
 286         sfree (cb->pass);
 287         sfree (cb->credentials);
 288         sfree (cb->cacert);
 289         sfree (cb->capath);
 290         sfree (cb->clientkey);
 291         sfree (cb->clientcert);
 292         sfree (cb->clientkeypass);
 293
 294         sfree (cb);
 295 } /* }}} void wh_callback_free */
 296
 297 static int wh_write_command (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 298                 wh_callback_t *cb)
 299 {
 300         char key[10*DATA_MAX_NAME_LEN];
 301         char values[512];
 302         char command[1024];
 303         size_t command_len;
 304
 305         int status;
 306
 307         if (0 != strcmp (ds->type, vl->type)) {
 308                 ERROR ("write_http plugin: DS type does not match "
 309                                 "value list type");
 310                 return -1;
 311         }
 312
 313         /* Copy the identifier to `key' and escape it. */
 314         status = FORMAT_VL (key, sizeof (key), vl);
 315         if (status != 0) {
 316                 ERROR ("write_http plugin: error with format_name");
 317                 return (status);
 318         }
 319         escape_string (key, sizeof (key));
 320
 321         /* Convert the values to an ASCII representation and put that into
 322          * `values'. */
 323         status = format_values (values, sizeof (values), ds, vl, cb->store_rates);
 324         if (status != 0) {
 325                 ERROR ("write_http plugin: error with "
 326                                 "wh_value_list_to_string");
 327                 return (status);
 328         }
 329
 330         command_len = (size_t) ssnprintf (command, sizeof (command),
 331                         "PUTVAL %s interval=%.3f %s\r\n",
 332                         key,
 333                         CDTIME_T_TO_DOUBLE (vl->interval),
 334                         values);
 335         if (command_len >= sizeof (command)) {
 336                 ERROR ("write_http plugin: Command buffer too small: "
 337                                 "Need %zu bytes.", command_len + 1);
 338                 return (-1);
 339         }
 340
 341         pthread_mutex_lock (&cb->send_lock);
 342
 343         if (cb->curl == NULL)
 344         {
 345                 status = wh_callback_init (cb);
 346                 if (status != 0)
 347                 {
 348                         ERROR ("write_http plugin: wh_callback_init failed.");
 349                         pthread_mutex_unlock (&cb->send_lock);
 350                         return (-1);
 351                 }
 352         }
 353
 354         if (command_len >= cb->send_buffer_free)
 355         {
 356                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 357                 if (status != 0)
 358                 {
 359                         pthread_mutex_unlock (&cb->send_lock);
 360                         return (status);
 361                 }
 362         }
 363         assert (command_len < cb->send_buffer_free);
 364
 365         /* `command_len + 1' because `command_len' does not include the
 366          * trailing null byte. Neither does `send_buffer_fill'. */
 367         memcpy (cb->send_buffer + cb->send_buffer_fill,
 368                         command, command_len + 1);
 369         cb->send_buffer_fill += command_len;
 370         cb->send_buffer_free -= command_len;
 371
 372         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%) \"%s\"",
 373                         cb->location,
 374                         cb->send_buffer_fill, sizeof (cb->send_buffer),
 375                         100.0 * ((double) cb->send_buffer_fill) / ((double) sizeof (cb->send_buffer)),
 376                         command);
 377
 378         /* Check if we have enough space for this command. */
 379         pthread_mutex_unlock (&cb->send_lock);
 380
 381         return (0);
 382 } /* }}} int wh_write_command */
 383
 384 static int wh_write_json (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 385                 wh_callback_t *cb)
 386 {
 387         int status;
 388
 389         pthread_mutex_lock (&cb->send_lock);
 390
 391         if (cb->curl == NULL)
 392         {
 393                 status = wh_callback_init (cb);
 394                 if (status != 0)
 395                 {
 396                         ERROR ("write_http plugin: wh_callback_init failed.");
 397                         pthread_mutex_unlock (&cb->send_lock);
 398                         return (-1);
 399                 }
 400         }
 401
 402         status = format_json_value_list (cb->send_buffer,
 403                         &cb->send_buffer_fill,
 404                         &cb->send_buffer_free,
 405                         ds, vl, cb->store_rates);
 406         if (status == (-ENOMEM))
 407         {
 408                 status = wh_flush_nolock (/* timeout = */ 0, cb);
 409                 if (status != 0)
 410                 {
 411                         wh_reset_buffer (cb);
 412                         pthread_mutex_unlock (&cb->send_lock);
 413                         return (status);
 414                 }
 415
 416                 status = format_json_value_list (cb->send_buffer,
 417                                 &cb->send_buffer_fill,
 418                                 &cb->send_buffer_free,
 419                                 ds, vl, cb->store_rates);
 420         }
 421         if (status != 0)
 422         {
 423                 pthread_mutex_unlock (&cb->send_lock);
 424                 return (status);
 425         }
 426
 427         DEBUG ("write_http plugin: <%s> buffer %zu/%zu (%g%%)",
 428                         cb->location,
 429                         cb->send_buffer_fill, sizeof (cb->send_buffer),
 430                         100.0 * ((double) cb->send_buffer_fill) / ((double) sizeof (cb->send_buffer)));
 431
 432         /* Check if we have enough space for this command. */
 433         pthread_mutex_unlock (&cb->send_lock);
 434
 435         return (0);
 436 } /* }}} int wh_write_json */
 437
 438 static int wh_write (const data_set_t *ds, const value_list_t *vl, /* {{{ */
 439                 user_data_t *user_data)
 440 {
 441         wh_callback_t *cb;
 442         int status;
 443
 444         if (user_data == NULL)
 445                 return (-EINVAL);
 446
 447         cb = user_data->data;
 448
 449         if (cb->format == WH_FORMAT_JSON)
 450                 status = wh_write_json (ds, vl, cb);
 451         else
 452                 status = wh_write_command (ds, vl, cb);
 453
 454         return (status);
 455 } /* }}} int wh_write */
 456
 457 static int config_set_format (wh_callback_t *cb, /* {{{ */
 458                 oconfig_item_t *ci)
 459 {
 460         char *string;
 461
 462         if ((ci->values_num != 1)
 463                         || (ci->values[0].type != OCONFIG_TYPE_STRING))
 464         {
 465                 WARNING ("write_http plugin: The `%s' config option "
 466                                 "needs exactly one string argument.", ci->key);
 467                 return (-1);
 468         }
 469
 470         string = ci->values[0].value.string;
 471         if (strcasecmp ("Command", string) == 0)
 472                 cb->format = WH_FORMAT_COMMAND;
 473         else if (strcasecmp ("JSON", string) == 0)
 474                 cb->format = WH_FORMAT_JSON;
 475         else
 476         {
 477                 ERROR ("write_http plugin: Invalid format string: %s",
 478                                 string);
 479                 return (-1);
 480         }
 481
 482         return (0);
 483 } /* }}} int config_set_format */
 484
 485 static int wh_config_url (oconfig_item_t *ci) /* {{{ */
 486 {
 487         wh_callback_t *cb;
 488         user_data_t user_data;
 489         int i;
 490
 491         cb = malloc (sizeof (*cb));
 492         if (cb == NULL)
 493         {
 494                 ERROR ("write_http plugin: malloc failed.");
 495                 return (-1);
 496         }
 497         memset (cb, 0, sizeof (*cb));
 498         cb->verify_peer = 1;
 499         cb->verify_host = 1;
 500         cb->format = WH_FORMAT_COMMAND;
 501         cb->sslversion = CURL_SSLVERSION_DEFAULT;
 502
 503         pthread_mutex_init (&cb->send_lock, /* attr = */ NULL);
 504
 505         cf_util_get_string (ci, &cb->location);
 506         if (cb->location == NULL)
 507                 return (-1);
 508
 509         for (i = 0; i < ci->children_num; i++)
 510         {
 511                 oconfig_item_t *child = ci->children + i;
 512
 513                 if (strcasecmp ("User", child->key) == 0)
 514                         cf_util_get_string (child, &cb->user);
 515                 else if (strcasecmp ("Password", child->key) == 0)
 516                         cf_util_get_string (child, &cb->pass);
 517                 else if (strcasecmp ("VerifyPeer", child->key) == 0)
 518                         cf_util_get_boolean (child, &cb->verify_peer);
 519                 else if (strcasecmp ("VerifyHost", child->key) == 0)
 520                         cf_util_get_boolean (child, &cb->verify_host);
 521                 else if (strcasecmp ("CACert", child->key) == 0)
 522                         cf_util_get_string (child, &cb->cacert);
 523                 else if (strcasecmp ("CAPath", child->key) == 0)
 524                         cf_util_get_string (child, &cb->capath);
 525                 else if (strcasecmp ("ClientKey", child->key) == 0)
 526                         cf_util_get_string (child, &cb->clientkey);
 527                 else if (strcasecmp ("ClientCert", child->key) == 0)
 528                         cf_util_get_string (child, &cb->clientcert);
 529                 else if (strcasecmp ("ClientKeyPass", child->key) == 0)
 530                         cf_util_get_string (child, &cb->clientkeypass);
 531                 else if (strcasecmp ("SSLVersion", child->key) == 0)
 532                 {
 533                         char *value = NULL;
 534
 535                         cf_util_get_string (child, &value);
 536
 537                         if (value == NULL || strcasecmp ("default", value) == 0)
 538                                 cb->sslversion = CURL_SSLVERSION_DEFAULT;
 539                         else if (strcasecmp ("SSLv2", value) == 0)
 540                                 cb->sslversion = CURL_SSLVERSION_SSLv2;
 541                         else if (strcasecmp ("SSLv3", value) == 0)
 542                                 cb->sslversion = CURL_SSLVERSION_SSLv3;
 543                         else if (strcasecmp ("TLSv1", value) == 0)
 544                                 cb->sslversion = CURL_SSLVERSION_TLSv1;
 545 #if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 34)
 546                         else if (strcasecmp ("TLSv1_0", value) == 0)
 547                                 cb->sslversion = CURL_SSLVERSION_TLSv1_0;
 548                         else if (strcasecmp ("TLSv1_1", value) == 0)
 549                                 cb->sslversion = CURL_SSLVERSION_TLSv1_1;
 550                         else if (strcasecmp ("TLSv1_2", value) == 0)
 551                                 cb->sslversion = CURL_SSLVERSION_TLSv1_2;
 552 #endif
 553                         else
 554                                 ERROR ("write_http plugin: Invalid SSLVersion "
 555                                                 "option: %s.", value);
 556
 557                         sfree(value);
 558                 }
 559                 else if (strcasecmp ("Format", child->key) == 0)
 560                         config_set_format (cb, child);
 561                 else if (strcasecmp ("StoreRates", child->key) == 0)
 562                         cf_util_get_boolean (child, &cb->store_rates);
 563                 else
 564                 {
 565                         ERROR ("write_http plugin: Invalid configuration "
 566                                         "option: %s.", child->key);
 567                 }
 568         }
 569
 570         DEBUG ("write_http: Registering write callback with URL %s",
 571                         cb->location);
 572
 573         memset (&user_data, 0, sizeof (user_data));
 574         user_data.data = cb;
 575         user_data.free_func = NULL;
 576         plugin_register_flush ("write_http", wh_flush, &user_data);
 577
 578         user_data.free_func = wh_callback_free;
 579         plugin_register_write ("write_http", wh_write, &user_data);
 580
 581         return (0);
 582 } /* }}} int wh_config_url */
 583
 584 static int wh_config (oconfig_item_t *ci) /* {{{ */
 585 {
 586         int i;
 587
 588         for (i = 0; i < ci->children_num; i++)
 589         {
 590                 oconfig_item_t *child = ci->children + i;
 591
 592                 if (strcasecmp ("URL", child->key) == 0)
 593                         wh_config_url (child);
 594                 else
 595                 {
 596                         ERROR ("write_http plugin: Invalid configuration "
 597                                         "option: %s.", child->key);
 598                 }
 599         }
 600
 601         return (0);
 602 } /* }}} int wh_config */
 603
 604 void module_register (void) /* {{{ */
 605 {
 606         plugin_register_complex_config ("write_http", wh_config);
 607 } /* }}} void module_register */
 608
 609 /* vim: set fdm=marker sw=8 ts=8 tw=78 et : */