1 /**
2 * collectd - src/curl_json.c
3 * Copyright (C) 2009 Doug MacEachern
4 * Copyright (C) 2006-2013 Florian octo Forster
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Doug MacEachern <dougm at hyperic.com>
21 * Florian octo Forster <octo at collectd.org>
22 **/
24 #include "collectd.h"
25 #include "common.h"
26 #include "plugin.h"
27 #include "configfile.h"
28 #include "utils_avltree.h"
29 #include "utils_complain.h"
31 #include <sys/socket.h>
32 #include <sys/types.h>
33 #include <sys/un.h>
35 #include <curl/curl.h>
37 #include <yajl/yajl_parse.h>
38 #if HAVE_YAJL_YAJL_VERSION_H
39 # include <yajl/yajl_version.h>
40 #endif
42 #if defined(YAJL_MAJOR) && (YAJL_MAJOR > 1)
43 # define HAVE_YAJL_V2 1
44 #endif
46 #define CJ_DEFAULT_HOST "localhost"
47 #define CJ_KEY_MAGIC 0x43484b59UL /* CHKY */
48 #define CJ_IS_KEY(key) ((key)->magic == CJ_KEY_MAGIC)
49 #define CJ_ANY "*"
50 #define COUCH_MIN(x,y) ((x) < (y) ? (x) : (y))
52 struct cj_key_s;
53 typedef struct cj_key_s cj_key_t;
54 struct cj_key_s /* {{{ */
55 {
56 unsigned long magic;
57 char *path;
58 char *type;
59 char *instance;
60 };
61 /* }}} */
63 struct cj_s /* {{{ */
64 {
65 char *instance;
66 char *host;
68 char *sock;
70 char *url;
71 char *user;
72 char *pass;
73 char *credentials;
74 _Bool digest;
75 _Bool verify_peer;
76 _Bool verify_host;
77 char *cacert;
78 struct curl_slist *headers;
79 char *post_body;
80 cdtime_t interval;
82 CURL *curl;
83 char curl_errbuf[CURL_ERROR_SIZE];
85 yajl_handle yajl;
86 c_avl_tree_t *tree;
87 cj_key_t *key;
88 int depth;
89 struct {
90 union {
91 c_avl_tree_t *tree;
92 cj_key_t *key;
93 };
94 _Bool in_array;
95 int index;
96 char name[DATA_MAX_NAME_LEN];
97 } state[YAJL_MAX_DEPTH];
98 };
99 typedef struct cj_s cj_t; /* }}} */
101 #if HAVE_YAJL_V2
102 typedef size_t yajl_len_t;
103 #else
104 typedef unsigned int yajl_len_t;
105 #endif
107 static int cj_read (user_data_t *ud);
108 static void cj_submit (cj_t *db, cj_key_t *key, value_t *value);
110 static size_t cj_curl_callback (void *buf, /* {{{ */
111 size_t size, size_t nmemb, void *user_data)
112 {
113 cj_t *db;
114 size_t len;
115 yajl_status status;
117 len = size * nmemb;
119 if (len <= 0)
120 return (len);
122 db = user_data;
123 if (db == NULL)
124 return (0);
126 status = yajl_parse(db->yajl, (unsigned char *)buf, len);
127 if (status == yajl_status_ok)
128 return (len);
129 #if !HAVE_YAJL_V2
130 else if (status == yajl_status_insufficient_data)
131 return (len);
132 #endif
134 if (status != yajl_status_ok)
135 {
136 unsigned char *msg =
137 yajl_get_error(db->yajl, /* verbose = */ 1,
138 /* jsonText = */ (unsigned char *) buf, (unsigned int) len);
139 ERROR ("curl_json plugin: yajl_parse failed: %s", msg);
140 yajl_free_error(db->yajl, msg);
141 return (0); /* abort write callback */
142 }
144 return (len);
145 } /* }}} size_t cj_curl_callback */
147 static int cj_get_type (cj_key_t *key)
148 {
149 const data_set_t *ds;
151 ds = plugin_get_ds (key->type);
152 if (ds == NULL)
153 {
154 static char type[DATA_MAX_NAME_LEN] = "!!!invalid!!!";
156 assert (key->type != NULL);
157 if (strcmp (type, key->type) != 0)
158 {
159 ERROR ("curl_json plugin: Unable to look up DS type \"%s\".",
160 key->type);
161 sstrncpy (type, key->type, sizeof (type));
162 }
164 return -1;
165 }
166 else if (ds->ds_num > 1)
167 {
168 static c_complain_t complaint = C_COMPLAIN_INIT_STATIC;
170 c_complain_once (LOG_WARNING, &complaint,
171 "curl_json plugin: The type \"%s\" has more than one data source. "
172 "This is currently not supported. I will return the type of the "
173 "first data source, but this will likely lead to problems later on.",
174 key->type);
175 }
177 return ds->ds[0].type;
178 }
180 static int cj_cb_map_key (void *ctx, const unsigned char *val,
181 yajl_len_t len);
183 static void cj_cb_inc_array_index (void *ctx, _Bool update_key)
184 {
185 cj_t *db = (cj_t *)ctx;
187 if (!db->state[db->depth].in_array)
188 return;
190 db->state[db->depth].index++;
192 if (update_key)
193 {
194 char name[DATA_MAX_NAME_LEN];
196 ssnprintf (name, sizeof (name), "%d", db->state[db->depth].index - 1);
198 cj_cb_map_key (ctx, (unsigned char *)name, (yajl_len_t) strlen (name));
199 }
200 }
202 /* yajl callbacks */
203 #define CJ_CB_ABORT 0
204 #define CJ_CB_CONTINUE 1
206 static int cj_cb_boolean (void * ctx, int boolVal)
207 {
208 cj_cb_inc_array_index (ctx, /* update_key = */ 0);
209 return (CJ_CB_CONTINUE);
210 }
212 static int cj_cb_null (void * ctx)
213 {
214 cj_cb_inc_array_index (ctx, /* update_key = */ 0);
215 return (CJ_CB_CONTINUE);
216 }
218 static int cj_cb_number (void *ctx,
219 const char *number, yajl_len_t number_len)
220 {
221 char buffer[number_len + 1];
223 cj_t *db = (cj_t *)ctx;
224 cj_key_t *key = db->state[db->depth].key;
225 value_t vt;
226 int type;
227 int status;
229 /* Create a null-terminated version of the string. */
230 memcpy (buffer, number, number_len);
231 buffer[sizeof (buffer) - 1] = 0;
233 if ((key == NULL) || !CJ_IS_KEY (key)) {
234 if (key != NULL && !db->state[db->depth].in_array/*can be inhomogeneous*/)
235 NOTICE ("curl_json plugin: Found \"%s\", but the configuration expects"
236 " a map.", buffer);
237 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
238 key = db->state[db->depth].key;
239 if (key == NULL) {
240 return (CJ_CB_CONTINUE);
241 }
242 }
243 else
244 {
245 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
246 }
248 type = cj_get_type (key);
249 status = parse_value (buffer, &vt, type);
250 if (status != 0)
251 {
252 NOTICE ("curl_json plugin: Unable to parse number: \"%s\"", buffer);
253 return (CJ_CB_CONTINUE);
254 }
256 cj_submit (db, key, &vt);
257 return (CJ_CB_CONTINUE);
258 } /* int cj_cb_number */
260 /* Queries the key-tree of the parent context for "in_name" and, if found,
261 * updates the "key" field of the current context. Otherwise, "key" is set to
262 * NULL. */
263 static int cj_cb_map_key (void *ctx,
264 unsigned char const *in_name, yajl_len_t in_name_len)
265 {
266 cj_t *db = (cj_t *)ctx;
267 c_avl_tree_t *tree;
269 tree = db->state[db->depth-1].tree;
271 if (tree != NULL)
272 {
273 cj_key_t *value = NULL;
274 char *name;
275 size_t name_len;
277 /* Create a null-terminated version of the name. */
278 name = db->state[db->depth].name;
279 name_len = COUCH_MIN ((size_t) in_name_len,
280 sizeof (db->state[db->depth].name) - 1);
281 memcpy (name, in_name, name_len);
282 name[name_len] = 0;
284 if (c_avl_get (tree, name, (void *) &value) == 0) {
285 if (CJ_IS_KEY((cj_key_t*)value)) {
286 db->state[db->depth].key = value;
287 }
288 else {
289 db->state[db->depth].tree = (c_avl_tree_t*) value;
290 }
291 }
292 else if (c_avl_get (tree, CJ_ANY, (void *) &value) == 0)
293 if (CJ_IS_KEY((cj_key_t*)value)) {
294 db->state[db->depth].key = value;
295 }
296 else {
297 db->state[db->depth].tree = (c_avl_tree_t*) value;
298 }
299 else
300 db->state[db->depth].key = NULL;
301 }
303 return (CJ_CB_CONTINUE);
304 }
306 static int cj_cb_string (void *ctx, const unsigned char *val,
307 yajl_len_t len)
308 {
309 /* Handle the string as if it was a number. */
310 return (cj_cb_number (ctx, (const char *) val, len));
311 } /* int cj_cb_string */
313 static int cj_cb_start (void *ctx)
314 {
315 cj_t *db = (cj_t *)ctx;
316 if (++db->depth >= YAJL_MAX_DEPTH)
317 {
318 ERROR ("curl_json plugin: %s depth exceeds max, aborting.",
319 db->url ? db->url : db->sock);
320 return (CJ_CB_ABORT);
321 }
322 return (CJ_CB_CONTINUE);
323 }
325 static int cj_cb_end (void *ctx)
326 {
327 cj_t *db = (cj_t *)ctx;
328 db->state[db->depth].tree = NULL;
329 --db->depth;
330 return (CJ_CB_CONTINUE);
331 }
333 static int cj_cb_start_map (void *ctx)
334 {
335 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
336 return cj_cb_start (ctx);
337 }
339 static int cj_cb_end_map (void *ctx)
340 {
341 return cj_cb_end (ctx);
342 }
344 static int cj_cb_start_array (void * ctx)
345 {
346 cj_t *db = (cj_t *)ctx;
347 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
348 if (db->depth+1 < YAJL_MAX_DEPTH) {
349 db->state[db->depth+1].in_array = 1;
350 db->state[db->depth+1].index = 0;
351 }
352 return cj_cb_start (ctx);
353 }
355 static int cj_cb_end_array (void * ctx)
356 {
357 cj_t *db = (cj_t *)ctx;
358 db->state[db->depth].in_array = 0;
359 return cj_cb_end (ctx);
360 }
362 static yajl_callbacks ycallbacks = {
363 cj_cb_null, /* null */
364 cj_cb_boolean, /* boolean */
365 NULL, /* integer */
366 NULL, /* double */
367 cj_cb_number,
368 cj_cb_string,
369 cj_cb_start_map,
370 cj_cb_map_key,
371 cj_cb_end_map,
372 cj_cb_start_array,
373 cj_cb_end_array
374 };
376 /* end yajl callbacks */
378 static void cj_key_free (cj_key_t *key) /* {{{ */
379 {
380 if (key == NULL)
381 return;
383 sfree (key->path);
384 sfree (key->type);
385 sfree (key->instance);
387 sfree (key);
388 } /* }}} void cj_key_free */
390 static void cj_tree_free (c_avl_tree_t *tree) /* {{{ */
391 {
392 char *name;
393 void *value;
395 while (c_avl_pick (tree, (void *) &name, (void *) &value) == 0)
396 {
397 cj_key_t *key = (cj_key_t *)value;
399 if (CJ_IS_KEY(key))
400 cj_key_free (key);
401 else
402 cj_tree_free ((c_avl_tree_t *)value);
404 sfree (name);
405 }
407 c_avl_destroy (tree);
408 } /* }}} void cj_tree_free */
410 static void cj_free (void *arg) /* {{{ */
411 {
412 cj_t *db;
414 DEBUG ("curl_json plugin: cj_free (arg = %p);", arg);
416 db = (cj_t *) arg;
418 if (db == NULL)
419 return;
421 if (db->curl != NULL)
422 curl_easy_cleanup (db->curl);
423 db->curl = NULL;
425 if (db->tree != NULL)
426 cj_tree_free (db->tree);
427 db->tree = NULL;
429 sfree (db->instance);
430 sfree (db->host);
432 sfree (db->sock);
434 sfree (db->url);
435 sfree (db->user);
436 sfree (db->pass);
437 sfree (db->credentials);
438 sfree (db->cacert);
439 sfree (db->post_body);
440 curl_slist_free_all (db->headers);
442 sfree (db);
443 } /* }}} void cj_free */
445 /* Configuration handling functions {{{ */
447 static c_avl_tree_t *cj_avl_create(void)
448 {
449 return c_avl_create ((int (*) (const void *, const void *)) strcmp);
450 }
452 static int cj_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
453 oconfig_item_t *ci)
454 {
455 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
456 {
457 WARNING ("curl_json plugin: `%s' needs exactly one string argument.", name);
458 return (-1);
459 }
461 *dest = curl_slist_append(*dest, ci->values[0].value.string);
462 if (*dest == NULL)
463 return (-1);
465 return (0);
466 } /* }}} int cj_config_append_string */
468 static int cj_config_add_key (cj_t *db, /* {{{ */
469 oconfig_item_t *ci)
470 {
471 cj_key_t *key;
472 int status;
473 int i;
475 if ((ci->values_num != 1)
476 || (ci->values[0].type != OCONFIG_TYPE_STRING))
477 {
478 WARNING ("curl_json plugin: The `Key' block "
479 "needs exactly one string argument.");
480 return (-1);
481 }
483 key = (cj_key_t *) malloc (sizeof (*key));
484 if (key == NULL)
485 {
486 ERROR ("curl_json plugin: malloc failed.");
487 return (-1);
488 }
489 memset (key, 0, sizeof (*key));
490 key->magic = CJ_KEY_MAGIC;
492 if (strcasecmp ("Key", ci->key) == 0)
493 {
494 status = cf_util_get_string (ci, &key->path);
495 if (status != 0)
496 {
497 sfree (key);
498 return (status);
499 }
500 }
501 else
502 {
503 ERROR ("curl_json plugin: cj_config: "
504 "Invalid key: %s", ci->key);
505 return (-1);
506 }
508 status = 0;
509 for (i = 0; i < ci->children_num; i++)
510 {
511 oconfig_item_t *child = ci->children + i;
513 if (strcasecmp ("Type", child->key) == 0)
514 status = cf_util_get_string (child, &key->type);
515 else if (strcasecmp ("Instance", child->key) == 0)
516 status = cf_util_get_string (child, &key->instance);
517 else
518 {
519 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
520 status = -1;
521 }
523 if (status != 0)
524 break;
525 } /* for (i = 0; i < ci->children_num; i++) */
527 while (status == 0)
528 {
529 if (key->type == NULL)
530 {
531 WARNING ("curl_json plugin: `Type' missing in `Key' block.");
532 status = -1;
533 }
535 break;
536 } /* while (status == 0) */
538 /* store path in a tree that will match the json map structure, example:
539 * "httpd/requests/count",
540 * "httpd/requests/current" ->
541 * { "httpd": { "requests": { "count": $key, "current": $key } } }
542 */
543 if (status == 0)
544 {
545 char *ptr;
546 char *name;
547 char ent[PATH_MAX];
548 c_avl_tree_t *tree;
550 if (db->tree == NULL)
551 db->tree = cj_avl_create();
553 tree = db->tree;
554 name = key->path;
555 ptr = key->path;
556 if (*ptr == '/')
557 ++ptr;
559 name = ptr;
560 while (*ptr)
561 {
562 if (*ptr == '/')
563 {
564 c_avl_tree_t *value;
565 int len;
567 len = ptr-name;
568 if (len == 0)
569 break;
570 len = COUCH_MIN(len, sizeof (ent)-1);
571 sstrncpy (ent, name, len+1);
573 if (c_avl_get (tree, ent, (void *) &value) != 0)
574 {
575 value = cj_avl_create ();
576 c_avl_insert (tree, strdup (ent), value);
577 }
579 tree = value;
580 name = ptr+1;
581 }
582 ++ptr;
583 }
584 if (*name)
585 c_avl_insert (tree, strdup(name), key);
586 else
587 {
588 ERROR ("curl_json plugin: invalid key: %s", key->path);
589 status = -1;
590 }
591 }
593 return (status);
594 } /* }}} int cj_config_add_key */
596 static int cj_init_curl (cj_t *db) /* {{{ */
597 {
598 db->curl = curl_easy_init ();
599 if (db->curl == NULL)
600 {
601 ERROR ("curl_json plugin: curl_easy_init failed.");
602 return (-1);
603 }
605 curl_easy_setopt (db->curl, CURLOPT_NOSIGNAL, 1L);
606 curl_easy_setopt (db->curl, CURLOPT_WRITEFUNCTION, cj_curl_callback);
607 curl_easy_setopt (db->curl, CURLOPT_WRITEDATA, db);
608 curl_easy_setopt (db->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
609 curl_easy_setopt (db->curl, CURLOPT_ERRORBUFFER, db->curl_errbuf);
610 curl_easy_setopt (db->curl, CURLOPT_URL, db->url);
612 if (db->user != NULL)
613 {
614 #ifdef HAVE_CURLOPT_USERNAME
615 curl_easy_setopt (db->curl, CURLOPT_USERNAME, db->user);
616 curl_easy_setopt (db->curl, CURLOPT_PASSWORD,
617 (db->pass == NULL) ? "" : db->pass);
618 #else
619 size_t credentials_size;
621 credentials_size = strlen (db->user) + 2;
622 if (db->pass != NULL)
623 credentials_size += strlen (db->pass);
625 db->credentials = (char *) malloc (credentials_size);
626 if (db->credentials == NULL)
627 {
628 ERROR ("curl_json plugin: malloc failed.");
629 return (-1);
630 }
632 ssnprintf (db->credentials, credentials_size, "%s:%s",
633 db->user, (db->pass == NULL) ? "" : db->pass);
634 curl_easy_setopt (db->curl, CURLOPT_USERPWD, db->credentials);
635 #endif
637 if (db->digest)
638 curl_easy_setopt (db->curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
639 }
641 curl_easy_setopt (db->curl, CURLOPT_SSL_VERIFYPEER, (long) db->verify_peer);
642 curl_easy_setopt (db->curl, CURLOPT_SSL_VERIFYHOST,
643 db->verify_host ? 2L : 0L);
644 if (db->cacert != NULL)
645 curl_easy_setopt (db->curl, CURLOPT_CAINFO, db->cacert);
646 if (db->headers != NULL)
647 curl_easy_setopt (db->curl, CURLOPT_HTTPHEADER, db->headers);
648 if (db->post_body != NULL)
649 curl_easy_setopt (db->curl, CURLOPT_POSTFIELDS, db->post_body);
651 return (0);
652 } /* }}} int cj_init_curl */
654 static int cj_config_add_url (oconfig_item_t *ci) /* {{{ */
655 {
656 cj_t *db;
657 int status = 0;
658 int i;
660 if ((ci->values_num != 1)
661 || (ci->values[0].type != OCONFIG_TYPE_STRING))
662 {
663 WARNING ("curl_json plugin: The `URL' block "
664 "needs exactly one string argument.");
665 return (-1);
666 }
668 db = (cj_t *) malloc (sizeof (*db));
669 if (db == NULL)
670 {
671 ERROR ("curl_json plugin: malloc failed.");
672 return (-1);
673 }
674 memset (db, 0, sizeof (*db));
676 if (strcasecmp ("URL", ci->key) == 0)
677 status = cf_util_get_string (ci, &db->url);
678 else if (strcasecmp ("Sock", ci->key) == 0)
679 status = cf_util_get_string (ci, &db->sock);
680 else
681 {
682 ERROR ("curl_json plugin: cj_config: "
683 "Invalid key: %s", ci->key);
684 return (-1);
685 }
686 if (status != 0)
687 {
688 sfree (db);
689 return (status);
690 }
692 /* Fill the `cj_t' structure.. */
693 for (i = 0; i < ci->children_num; i++)
694 {
695 oconfig_item_t *child = ci->children + i;
697 if (strcasecmp ("Instance", child->key) == 0)
698 status = cf_util_get_string (child, &db->instance);
699 else if (strcasecmp ("Host", child->key) == 0)
700 status = cf_util_get_string (child, &db->host);
701 else if (db->url && strcasecmp ("User", child->key) == 0)
702 status = cf_util_get_string (child, &db->user);
703 else if (db->url && strcasecmp ("Password", child->key) == 0)
704 status = cf_util_get_string (child, &db->pass);
705 else if (strcasecmp ("Digest", child->key) == 0)
706 status = cf_util_get_boolean (child, &db->digest);
707 else if (db->url && strcasecmp ("VerifyPeer", child->key) == 0)
708 status = cf_util_get_boolean (child, &db->verify_peer);
709 else if (db->url && strcasecmp ("VerifyHost", child->key) == 0)
710 status = cf_util_get_boolean (child, &db->verify_host);
711 else if (db->url && strcasecmp ("CACert", child->key) == 0)
712 status = cf_util_get_string (child, &db->cacert);
713 else if (db->url && strcasecmp ("Header", child->key) == 0)
714 status = cj_config_append_string ("Header", &db->headers, child);
715 else if (db->url && strcasecmp ("Post", child->key) == 0)
716 status = cf_util_get_string (child, &db->post_body);
717 else if (strcasecmp ("Key", child->key) == 0)
718 status = cj_config_add_key (db, child);
719 else if (strcasecmp ("Interval", child->key) == 0)
720 status = cf_util_get_cdtime(child, &db->interval);
721 else
722 {
723 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
724 status = -1;
725 }
727 if (status != 0)
728 break;
729 }
731 if (status == 0)
732 {
733 if (db->tree == NULL)
734 {
735 WARNING ("curl_json plugin: No (valid) `Key' block within `%s' \"`%s'\".",
736 db->url ? "URL" : "Sock", db->url ? db->url : db->sock);
737 status = -1;
738 }
739 if (status == 0 && db->url)
740 status = cj_init_curl (db);
741 }
743 /* If all went well, register this database for reading */
744 if (status == 0)
745 {
746 user_data_t ud;
747 char *cb_name;
748 struct timespec interval = { 0, 0 };
750 CDTIME_T_TO_TIMESPEC (db->interval, &interval);
752 if (db->instance == NULL)
753 db->instance = strdup("default");
755 DEBUG ("curl_json plugin: Registering new read callback: %s",
756 db->instance);
758 memset (&ud, 0, sizeof (ud));
759 ud.data = (void *) db;
760 ud.free_func = cj_free;
762 cb_name = ssnprintf_alloc ("curl_json-%s-%s",
763 db->instance, db->url ? db->url : db->sock);
765 plugin_register_complex_read (/* group = */ NULL, cb_name, cj_read,
766 /* interval = */ (db->interval > 0) ? &interval : NULL,
767 &ud);
768 sfree (cb_name);
769 }
770 else
771 {
772 cj_free (db);
773 return (-1);
774 }
776 return (0);
777 }
778 /* }}} int cj_config_add_database */
780 static int cj_config (oconfig_item_t *ci) /* {{{ */
781 {
782 int success;
783 int errors;
784 int status;
785 int i;
787 success = 0;
788 errors = 0;
790 for (i = 0; i < ci->children_num; i++)
791 {
792 oconfig_item_t *child = ci->children + i;
794 if (strcasecmp ("Sock", child->key) == 0
795 || strcasecmp ("URL", child->key) == 0)
796 {
797 status = cj_config_add_url (child);
798 if (status == 0)
799 success++;
800 else
801 errors++;
802 }
803 else
804 {
805 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
806 errors++;
807 }
808 }
810 if ((success == 0) && (errors > 0))
811 {
812 ERROR ("curl_json plugin: All statements failed.");
813 return (-1);
814 }
816 return (0);
817 } /* }}} int cj_config */
819 /* }}} End of configuration handling functions */
821 static void cj_submit (cj_t *db, cj_key_t *key, value_t *value) /* {{{ */
822 {
823 value_list_t vl = VALUE_LIST_INIT;
824 char *host;
826 vl.values = value;
827 vl.values_len = 1;
829 if ((db->host == NULL)
830 || (strcmp ("", db->host) == 0)
831 || (strcmp (CJ_DEFAULT_HOST, db->host) == 0))
832 host = hostname_g;
833 else
834 host = db->host;
836 if (key->instance == NULL)
837 {
838 int i, len = 0;
839 for (i = 0; i < db->depth; i++)
840 len += ssnprintf(vl.type_instance+len, sizeof(vl.type_instance)-len,
841 i ? "-%s" : "%s", db->state[i+1].name);
842 }
843 else
844 sstrncpy (vl.type_instance, key->instance, sizeof (vl.type_instance));
846 sstrncpy (vl.host, host, sizeof (vl.host));
847 sstrncpy (vl.plugin, "curl_json", sizeof (vl.plugin));
848 sstrncpy (vl.plugin_instance, db->instance, sizeof (vl.plugin_instance));
849 sstrncpy (vl.type, key->type, sizeof (vl.type));
851 if (db->interval > 0)
852 vl.interval = db->interval;
854 plugin_dispatch_values (&vl);
855 } /* }}} int cj_submit */
857 static int cj_sock_perform (cj_t *db) /* {{{ */
858 {
859 char errbuf[1024];
860 struct sockaddr_un sa_unix = {};
861 sa_unix.sun_family = AF_UNIX;
862 sstrncpy (sa_unix.sun_path, db->sock, sizeof (sa_unix.sun_path));
864 int fd = socket (AF_UNIX, SOCK_STREAM, 0);
865 if (fd < 0)
866 return (-1);
867 if (connect (fd, (struct sockaddr *)&sa_unix, sizeof(sa_unix)) < 0)
868 {
869 ERROR ("curl_json plugin: connect(%s) failed: %s",
870 (db->sock != NULL) ? db->sock : "<null>",
871 sstrerror(errno, errbuf, sizeof (errbuf)));
872 close (fd);
873 return (-1);
874 }
876 ssize_t red;
877 do {
878 unsigned char buffer[4096];
879 red = read (fd, buffer, sizeof(buffer));
880 if (red < 0) {
881 ERROR ("curl_json plugin: read(%s) failed: %s",
882 (db->sock != NULL) ? db->sock : "<null>",
883 sstrerror(errno, errbuf, sizeof (errbuf)));
884 close (fd);
885 return (-1);
886 }
887 if (!cj_curl_callback (buffer, red, 1, db))
888 break;
889 } while (red > 0);
890 close (fd);
891 return (0);
892 } /* }}} int cj_sock_perform */
895 static int cj_curl_perform(cj_t *db) /* {{{ */
896 {
897 int status;
898 long rc;
899 char *url;
900 url = db->url;
902 status = curl_easy_perform (db->curl);
903 if (status != CURLE_OK)
904 {
905 ERROR ("curl_json plugin: curl_easy_perform failed with status %i: %s (%s)",
906 status, db->curl_errbuf, url);
907 return (-1);
908 }
910 curl_easy_getinfo(db->curl, CURLINFO_EFFECTIVE_URL, &url);
911 curl_easy_getinfo(db->curl, CURLINFO_RESPONSE_CODE, &rc);
913 /* The response code is zero if a non-HTTP transport was used. */
914 if ((rc != 0) && (rc != 200))
915 {
916 ERROR ("curl_json plugin: curl_easy_perform failed with "
917 "response code %ld (%s)", rc, url);
918 return (-1);
919 }
920 return (0);
921 } /* }}} int cj_curl_perform */
923 static int cj_perform (cj_t *db) /* {{{ */
924 {
925 int status;
926 yajl_handle yprev = db->yajl;
928 db->yajl = yajl_alloc (&ycallbacks,
929 #if HAVE_YAJL_V2
930 /* alloc funcs = */ NULL,
931 #else
932 /* alloc funcs = */ NULL, NULL,
933 #endif
934 /* context = */ (void *)db);
935 if (db->yajl == NULL)
936 {
937 ERROR ("curl_json plugin: yajl_alloc failed.");
938 db->yajl = yprev;
939 return (-1);
940 }
942 if (db->url)
943 status = cj_curl_perform (db);
944 else
945 status = cj_sock_perform (db);
946 if (status < 0)
947 {
948 yajl_free (db->yajl);
949 db->yajl = yprev;
950 return (-1);
951 }
953 #if HAVE_YAJL_V2
954 status = yajl_complete_parse(db->yajl);
955 #else
956 status = yajl_parse_complete(db->yajl);
957 #endif
958 if (status != yajl_status_ok)
959 {
960 unsigned char *errmsg;
962 errmsg = yajl_get_error (db->yajl, /* verbose = */ 0,
963 /* jsonText = */ NULL, /* jsonTextLen = */ 0);
964 ERROR ("curl_json plugin: yajl_parse_complete failed: %s",
965 (char *) errmsg);
966 yajl_free_error (db->yajl, errmsg);
967 yajl_free (db->yajl);
968 db->yajl = yprev;
969 return (-1);
970 }
972 yajl_free (db->yajl);
973 db->yajl = yprev;
974 return (0);
975 } /* }}} int cj_perform */
977 static int cj_read (user_data_t *ud) /* {{{ */
978 {
979 cj_t *db;
981 if ((ud == NULL) || (ud->data == NULL))
982 {
983 ERROR ("curl_json plugin: cj_read: Invalid user data.");
984 return (-1);
985 }
987 db = (cj_t *) ud->data;
989 db->depth = 0;
990 memset (&db->state, 0, sizeof(db->state));
991 db->state[db->depth].tree = db->tree;
992 db->key = NULL;
994 return cj_perform (db);
995 } /* }}} int cj_read */
997 static int cj_init (void) /* {{{ */
998 {
999 /* Call this while collectd is still single-threaded to avoid
1000 * initialization issues in libgcrypt. */
1001 curl_global_init (CURL_GLOBAL_SSL);
1002 return (0);
1003 } /* }}} int cj_init */
1005 void module_register (void)
1006 {
1007 plugin_register_complex_config ("curl_json", cj_config);
1008 plugin_register_init ("curl_json", cj_init);
1009 } /* void module_register */
1011 /* vim: set sw=2 sts=2 et fdm=marker : */