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;
81 int timeout;
83 CURL *curl;
84 char curl_errbuf[CURL_ERROR_SIZE];
86 yajl_handle yajl;
87 c_avl_tree_t *tree;
88 cj_key_t *key;
89 int depth;
90 struct {
91 union {
92 c_avl_tree_t *tree;
93 cj_key_t *key;
94 };
95 _Bool in_array;
96 int index;
97 char name[DATA_MAX_NAME_LEN];
98 } state[YAJL_MAX_DEPTH];
99 };
100 typedef struct cj_s cj_t; /* }}} */
102 #if HAVE_YAJL_V2
103 typedef size_t yajl_len_t;
104 #else
105 typedef unsigned int yajl_len_t;
106 #endif
108 static int cj_read (user_data_t *ud);
109 static void cj_submit (cj_t *db, cj_key_t *key, value_t *value);
111 static size_t cj_curl_callback (void *buf, /* {{{ */
112 size_t size, size_t nmemb, void *user_data)
113 {
114 cj_t *db;
115 size_t len;
116 yajl_status status;
118 len = size * nmemb;
120 if (len <= 0)
121 return (len);
123 db = user_data;
124 if (db == NULL)
125 return (0);
127 status = yajl_parse(db->yajl, (unsigned char *)buf, len);
128 if (status == yajl_status_ok)
129 return (len);
130 #if !HAVE_YAJL_V2
131 else if (status == yajl_status_insufficient_data)
132 return (len);
133 #endif
135 unsigned char *msg = yajl_get_error(db->yajl, /* verbose = */ 1,
136 /* jsonText = */ (unsigned char *) buf, (unsigned int) len);
137 ERROR ("curl_json plugin: yajl_parse failed: %s", msg);
138 yajl_free_error(db->yajl, msg);
139 return (0); /* abort write callback */
140 } /* }}} size_t cj_curl_callback */
142 static int cj_get_type (cj_key_t *key)
143 {
144 const data_set_t *ds;
146 ds = plugin_get_ds (key->type);
147 if (ds == NULL)
148 {
149 static char type[DATA_MAX_NAME_LEN] = "!!!invalid!!!";
151 assert (key->type != NULL);
152 if (strcmp (type, key->type) != 0)
153 {
154 ERROR ("curl_json plugin: Unable to look up DS type \"%s\".",
155 key->type);
156 sstrncpy (type, key->type, sizeof (type));
157 }
159 return -1;
160 }
161 else if (ds->ds_num > 1)
162 {
163 static c_complain_t complaint = C_COMPLAIN_INIT_STATIC;
165 c_complain_once (LOG_WARNING, &complaint,
166 "curl_json plugin: The type \"%s\" has more than one data source. "
167 "This is currently not supported. I will return the type of the "
168 "first data source, but this will likely lead to problems later on.",
169 key->type);
170 }
172 return ds->ds[0].type;
173 }
175 static int cj_cb_map_key (void *ctx, const unsigned char *val,
176 yajl_len_t len);
178 static void cj_cb_inc_array_index (void *ctx, _Bool update_key)
179 {
180 cj_t *db = (cj_t *)ctx;
182 if (!db->state[db->depth].in_array)
183 return;
185 db->state[db->depth].index++;
187 if (update_key)
188 {
189 char name[DATA_MAX_NAME_LEN];
191 ssnprintf (name, sizeof (name), "%d", db->state[db->depth].index - 1);
193 cj_cb_map_key (ctx, (unsigned char *)name, (yajl_len_t) strlen (name));
194 }
195 }
197 /* yajl callbacks */
198 #define CJ_CB_ABORT 0
199 #define CJ_CB_CONTINUE 1
201 static int cj_cb_boolean (void * ctx, int boolVal)
202 {
203 cj_cb_inc_array_index (ctx, /* update_key = */ 0);
204 return (CJ_CB_CONTINUE);
205 }
207 static int cj_cb_null (void * ctx)
208 {
209 cj_cb_inc_array_index (ctx, /* update_key = */ 0);
210 return (CJ_CB_CONTINUE);
211 }
213 static int cj_cb_number (void *ctx,
214 const char *number, yajl_len_t number_len)
215 {
216 char buffer[number_len + 1];
218 cj_t *db = (cj_t *)ctx;
219 cj_key_t *key = db->state[db->depth].key;
220 value_t vt;
221 int type;
222 int status;
224 /* Create a null-terminated version of the string. */
225 memcpy (buffer, number, number_len);
226 buffer[sizeof (buffer) - 1] = 0;
228 if ((key == NULL) || !CJ_IS_KEY (key)) {
229 if (key != NULL && !db->state[db->depth].in_array/*can be inhomogeneous*/)
230 NOTICE ("curl_json plugin: Found \"%s\", but the configuration expects"
231 " a map.", buffer);
232 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
233 key = db->state[db->depth].key;
234 if (key == NULL) {
235 return (CJ_CB_CONTINUE);
236 }
237 }
238 else
239 {
240 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
241 }
243 type = cj_get_type (key);
244 status = parse_value (buffer, &vt, type);
245 if (status != 0)
246 {
247 NOTICE ("curl_json plugin: Unable to parse number: \"%s\"", buffer);
248 return (CJ_CB_CONTINUE);
249 }
251 cj_submit (db, key, &vt);
252 return (CJ_CB_CONTINUE);
253 } /* int cj_cb_number */
255 /* Queries the key-tree of the parent context for "in_name" and, if found,
256 * updates the "key" field of the current context. Otherwise, "key" is set to
257 * NULL. */
258 static int cj_cb_map_key (void *ctx,
259 unsigned char const *in_name, yajl_len_t in_name_len)
260 {
261 cj_t *db = (cj_t *)ctx;
262 c_avl_tree_t *tree;
264 tree = db->state[db->depth-1].tree;
266 if (tree != NULL)
267 {
268 cj_key_t *value = NULL;
269 char *name;
270 size_t name_len;
272 /* Create a null-terminated version of the name. */
273 name = db->state[db->depth].name;
274 name_len = COUCH_MIN ((size_t) in_name_len,
275 sizeof (db->state[db->depth].name) - 1);
276 memcpy (name, in_name, name_len);
277 name[name_len] = 0;
279 if (c_avl_get (tree, name, (void *) &value) == 0) {
280 if (CJ_IS_KEY((cj_key_t*)value)) {
281 db->state[db->depth].key = value;
282 }
283 else {
284 db->state[db->depth].tree = (c_avl_tree_t*) value;
285 }
286 }
287 else if (c_avl_get (tree, CJ_ANY, (void *) &value) == 0)
288 if (CJ_IS_KEY((cj_key_t*)value)) {
289 db->state[db->depth].key = value;
290 }
291 else {
292 db->state[db->depth].tree = (c_avl_tree_t*) value;
293 }
294 else
295 db->state[db->depth].key = NULL;
296 }
298 return (CJ_CB_CONTINUE);
299 }
301 static int cj_cb_string (void *ctx, const unsigned char *val,
302 yajl_len_t len)
303 {
304 /* Handle the string as if it was a number. */
305 return (cj_cb_number (ctx, (const char *) val, len));
306 } /* int cj_cb_string */
308 static int cj_cb_start (void *ctx)
309 {
310 cj_t *db = (cj_t *)ctx;
311 if (++db->depth >= YAJL_MAX_DEPTH)
312 {
313 ERROR ("curl_json plugin: %s depth exceeds max, aborting.",
314 db->url ? db->url : db->sock);
315 return (CJ_CB_ABORT);
316 }
317 return (CJ_CB_CONTINUE);
318 }
320 static int cj_cb_end (void *ctx)
321 {
322 cj_t *db = (cj_t *)ctx;
323 db->state[db->depth].tree = NULL;
324 --db->depth;
325 return (CJ_CB_CONTINUE);
326 }
328 static int cj_cb_start_map (void *ctx)
329 {
330 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
331 return cj_cb_start (ctx);
332 }
334 static int cj_cb_end_map (void *ctx)
335 {
336 return cj_cb_end (ctx);
337 }
339 static int cj_cb_start_array (void * ctx)
340 {
341 cj_t *db = (cj_t *)ctx;
342 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
343 if (db->depth+1 < YAJL_MAX_DEPTH) {
344 db->state[db->depth+1].in_array = 1;
345 db->state[db->depth+1].index = 0;
346 }
347 return cj_cb_start (ctx);
348 }
350 static int cj_cb_end_array (void * ctx)
351 {
352 cj_t *db = (cj_t *)ctx;
353 db->state[db->depth].in_array = 0;
354 return cj_cb_end (ctx);
355 }
357 static yajl_callbacks ycallbacks = {
358 cj_cb_null, /* null */
359 cj_cb_boolean, /* boolean */
360 NULL, /* integer */
361 NULL, /* double */
362 cj_cb_number,
363 cj_cb_string,
364 cj_cb_start_map,
365 cj_cb_map_key,
366 cj_cb_end_map,
367 cj_cb_start_array,
368 cj_cb_end_array
369 };
371 /* end yajl callbacks */
373 static void cj_key_free (cj_key_t *key) /* {{{ */
374 {
375 if (key == NULL)
376 return;
378 sfree (key->path);
379 sfree (key->type);
380 sfree (key->instance);
382 sfree (key);
383 } /* }}} void cj_key_free */
385 static void cj_tree_free (c_avl_tree_t *tree) /* {{{ */
386 {
387 char *name;
388 void *value;
390 while (c_avl_pick (tree, (void *) &name, (void *) &value) == 0)
391 {
392 cj_key_t *key = (cj_key_t *)value;
394 if (CJ_IS_KEY(key))
395 cj_key_free (key);
396 else
397 cj_tree_free ((c_avl_tree_t *)value);
399 sfree (name);
400 }
402 c_avl_destroy (tree);
403 } /* }}} void cj_tree_free */
405 static void cj_free (void *arg) /* {{{ */
406 {
407 cj_t *db;
409 DEBUG ("curl_json plugin: cj_free (arg = %p);", arg);
411 db = (cj_t *) arg;
413 if (db == NULL)
414 return;
416 if (db->curl != NULL)
417 curl_easy_cleanup (db->curl);
418 db->curl = NULL;
420 if (db->tree != NULL)
421 cj_tree_free (db->tree);
422 db->tree = NULL;
424 sfree (db->instance);
425 sfree (db->host);
427 sfree (db->sock);
429 sfree (db->url);
430 sfree (db->user);
431 sfree (db->pass);
432 sfree (db->credentials);
433 sfree (db->cacert);
434 sfree (db->post_body);
435 curl_slist_free_all (db->headers);
437 sfree (db);
438 } /* }}} void cj_free */
440 /* Configuration handling functions {{{ */
442 static c_avl_tree_t *cj_avl_create(void)
443 {
444 return c_avl_create ((int (*) (const void *, const void *)) strcmp);
445 }
447 static int cj_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
448 oconfig_item_t *ci)
449 {
450 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
451 {
452 WARNING ("curl_json plugin: `%s' needs exactly one string argument.", name);
453 return (-1);
454 }
456 *dest = curl_slist_append(*dest, ci->values[0].value.string);
457 if (*dest == NULL)
458 return (-1);
460 return (0);
461 } /* }}} int cj_config_append_string */
463 static int cj_config_add_key (cj_t *db, /* {{{ */
464 oconfig_item_t *ci)
465 {
466 cj_key_t *key;
467 int status;
468 int i;
470 if ((ci->values_num != 1)
471 || (ci->values[0].type != OCONFIG_TYPE_STRING))
472 {
473 WARNING ("curl_json plugin: The `Key' block "
474 "needs exactly one string argument.");
475 return (-1);
476 }
478 key = (cj_key_t *) malloc (sizeof (*key));
479 if (key == NULL)
480 {
481 ERROR ("curl_json plugin: malloc failed.");
482 return (-1);
483 }
484 memset (key, 0, sizeof (*key));
485 key->magic = CJ_KEY_MAGIC;
487 if (strcasecmp ("Key", ci->key) == 0)
488 {
489 status = cf_util_get_string (ci, &key->path);
490 if (status != 0)
491 {
492 sfree (key);
493 return (status);
494 }
495 }
496 else
497 {
498 ERROR ("curl_json plugin: cj_config: "
499 "Invalid key: %s", ci->key);
500 cj_key_free (key);
501 return (-1);
502 }
504 status = 0;
505 for (i = 0; i < ci->children_num; i++)
506 {
507 oconfig_item_t *child = ci->children + i;
509 if (strcasecmp ("Type", child->key) == 0)
510 status = cf_util_get_string (child, &key->type);
511 else if (strcasecmp ("Instance", child->key) == 0)
512 status = cf_util_get_string (child, &key->instance);
513 else
514 {
515 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
516 status = -1;
517 }
519 if (status != 0)
520 break;
521 } /* for (i = 0; i < ci->children_num; i++) */
523 if (status != 0)
524 {
525 cj_key_free (key);
526 return (-1);
527 }
529 if (key->type == NULL)
530 {
531 WARNING ("curl_json plugin: `Type' missing in `Key' block.");
532 cj_key_free (key);
533 return (-1);
534 }
536 /* store path in a tree that will match the json map structure, example:
537 * "httpd/requests/count",
538 * "httpd/requests/current" ->
539 * { "httpd": { "requests": { "count": $key, "current": $key } } }
540 */
541 char *ptr;
542 char *name;
543 c_avl_tree_t *tree;
545 if (db->tree == NULL)
546 db->tree = cj_avl_create();
548 tree = db->tree;
549 ptr = key->path;
550 if (*ptr == '/')
551 ++ptr;
553 name = ptr;
554 while ((ptr = strchr (name, '/')) != NULL)
555 {
556 char ent[PATH_MAX];
557 c_avl_tree_t *value;
558 size_t len;
560 len = ptr - name;
561 if (len == 0)
562 break;
564 len = COUCH_MIN(len, sizeof (ent)-1);
565 sstrncpy (ent, name, len+1);
567 if (c_avl_get (tree, ent, (void *) &value) != 0)
568 {
569 value = cj_avl_create ();
570 c_avl_insert (tree, strdup (ent), value);
571 }
573 tree = value;
574 name = ptr + 1;
575 }
577 if (strlen (name) == 0)
578 {
579 ERROR ("curl_json plugin: invalid key: %s", key->path);
580 cj_key_free (key);
581 return (-1);
582 }
584 c_avl_insert (tree, strdup (name), key);
585 return (status);
586 } /* }}} int cj_config_add_key */
588 static int cj_init_curl (cj_t *db) /* {{{ */
589 {
590 db->curl = curl_easy_init ();
591 if (db->curl == NULL)
592 {
593 ERROR ("curl_json plugin: curl_easy_init failed.");
594 return (-1);
595 }
597 curl_easy_setopt (db->curl, CURLOPT_NOSIGNAL, 1L);
598 curl_easy_setopt (db->curl, CURLOPT_WRITEFUNCTION, cj_curl_callback);
599 curl_easy_setopt (db->curl, CURLOPT_WRITEDATA, db);
600 curl_easy_setopt (db->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
601 curl_easy_setopt (db->curl, CURLOPT_ERRORBUFFER, db->curl_errbuf);
602 curl_easy_setopt (db->curl, CURLOPT_URL, db->url);
603 curl_easy_setopt (db->curl, CURLOPT_FOLLOWLOCATION, 1L);
604 curl_easy_setopt (db->curl, CURLOPT_MAXREDIRS, 50L);
606 if (db->user != NULL)
607 {
608 #ifdef HAVE_CURLOPT_USERNAME
609 curl_easy_setopt (db->curl, CURLOPT_USERNAME, db->user);
610 curl_easy_setopt (db->curl, CURLOPT_PASSWORD,
611 (db->pass == NULL) ? "" : db->pass);
612 #else
613 size_t credentials_size;
615 credentials_size = strlen (db->user) + 2;
616 if (db->pass != NULL)
617 credentials_size += strlen (db->pass);
619 db->credentials = (char *) malloc (credentials_size);
620 if (db->credentials == NULL)
621 {
622 ERROR ("curl_json plugin: malloc failed.");
623 return (-1);
624 }
626 ssnprintf (db->credentials, credentials_size, "%s:%s",
627 db->user, (db->pass == NULL) ? "" : db->pass);
628 curl_easy_setopt (db->curl, CURLOPT_USERPWD, db->credentials);
629 #endif
631 if (db->digest)
632 curl_easy_setopt (db->curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
633 }
635 curl_easy_setopt (db->curl, CURLOPT_SSL_VERIFYPEER, (long) db->verify_peer);
636 curl_easy_setopt (db->curl, CURLOPT_SSL_VERIFYHOST,
637 db->verify_host ? 2L : 0L);
638 if (db->cacert != NULL)
639 curl_easy_setopt (db->curl, CURLOPT_CAINFO, db->cacert);
640 if (db->headers != NULL)
641 curl_easy_setopt (db->curl, CURLOPT_HTTPHEADER, db->headers);
642 if (db->post_body != NULL)
643 curl_easy_setopt (db->curl, CURLOPT_POSTFIELDS, db->post_body);
645 #ifdef HAVE_CURLOPT_TIMEOUT_MS
646 if (db->timeout >= 0)
647 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS, (long) db->timeout);
648 else if (db->interval > 0)
649 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS,
650 CDTIME_T_TO_MS(db->timeout));
651 else
652 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS,
653 CDTIME_T_TO_MS(plugin_get_interval()));
654 #endif
656 return (0);
657 } /* }}} int cj_init_curl */
659 static int cj_config_add_url (oconfig_item_t *ci) /* {{{ */
660 {
661 cj_t *db;
662 int status = 0;
663 int i;
665 if ((ci->values_num != 1)
666 || (ci->values[0].type != OCONFIG_TYPE_STRING))
667 {
668 WARNING ("curl_json plugin: The `URL' block "
669 "needs exactly one string argument.");
670 return (-1);
671 }
673 db = (cj_t *) malloc (sizeof (*db));
674 if (db == NULL)
675 {
676 ERROR ("curl_json plugin: malloc failed.");
677 return (-1);
678 }
679 memset (db, 0, sizeof (*db));
681 db->timeout = -1;
683 if (strcasecmp ("URL", ci->key) == 0)
684 status = cf_util_get_string (ci, &db->url);
685 else if (strcasecmp ("Sock", ci->key) == 0)
686 status = cf_util_get_string (ci, &db->sock);
687 else
688 {
689 ERROR ("curl_json plugin: cj_config: "
690 "Invalid key: %s", ci->key);
691 cj_free (db);
692 return (-1);
693 }
694 if (status != 0)
695 {
696 sfree (db);
697 return (status);
698 }
700 /* Fill the `cj_t' structure.. */
701 for (i = 0; i < ci->children_num; i++)
702 {
703 oconfig_item_t *child = ci->children + i;
705 if (strcasecmp ("Instance", child->key) == 0)
706 status = cf_util_get_string (child, &db->instance);
707 else if (strcasecmp ("Host", child->key) == 0)
708 status = cf_util_get_string (child, &db->host);
709 else if (db->url && strcasecmp ("User", child->key) == 0)
710 status = cf_util_get_string (child, &db->user);
711 else if (db->url && strcasecmp ("Password", child->key) == 0)
712 status = cf_util_get_string (child, &db->pass);
713 else if (strcasecmp ("Digest", child->key) == 0)
714 status = cf_util_get_boolean (child, &db->digest);
715 else if (db->url && strcasecmp ("VerifyPeer", child->key) == 0)
716 status = cf_util_get_boolean (child, &db->verify_peer);
717 else if (db->url && strcasecmp ("VerifyHost", child->key) == 0)
718 status = cf_util_get_boolean (child, &db->verify_host);
719 else if (db->url && strcasecmp ("CACert", child->key) == 0)
720 status = cf_util_get_string (child, &db->cacert);
721 else if (db->url && strcasecmp ("Header", child->key) == 0)
722 status = cj_config_append_string ("Header", &db->headers, child);
723 else if (db->url && strcasecmp ("Post", child->key) == 0)
724 status = cf_util_get_string (child, &db->post_body);
725 else if (strcasecmp ("Key", child->key) == 0)
726 status = cj_config_add_key (db, child);
727 else if (strcasecmp ("Interval", child->key) == 0)
728 status = cf_util_get_cdtime(child, &db->interval);
729 else if (strcasecmp ("Timeout", child->key) == 0)
730 status = cf_util_get_int (child, &db->timeout);
731 else
732 {
733 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
734 status = -1;
735 }
737 if (status != 0)
738 break;
739 }
741 if (status == 0)
742 {
743 if (db->tree == NULL)
744 {
745 WARNING ("curl_json plugin: No (valid) `Key' block within `%s' \"`%s'\".",
746 db->url ? "URL" : "Sock", db->url ? db->url : db->sock);
747 status = -1;
748 }
749 if (status == 0 && db->url)
750 status = cj_init_curl (db);
751 }
753 /* If all went well, register this database for reading */
754 if (status == 0)
755 {
756 user_data_t ud;
757 char *cb_name;
758 struct timespec interval = { 0, 0 };
760 CDTIME_T_TO_TIMESPEC (db->interval, &interval);
762 if (db->instance == NULL)
763 db->instance = strdup("default");
765 DEBUG ("curl_json plugin: Registering new read callback: %s",
766 db->instance);
768 memset (&ud, 0, sizeof (ud));
769 ud.data = (void *) db;
770 ud.free_func = cj_free;
772 cb_name = ssnprintf_alloc ("curl_json-%s-%s",
773 db->instance, db->url ? db->url : db->sock);
775 plugin_register_complex_read (/* group = */ NULL, cb_name, cj_read,
776 /* interval = */ (db->interval > 0) ? &interval : NULL,
777 &ud);
778 sfree (cb_name);
779 }
780 else
781 {
782 cj_free (db);
783 return (-1);
784 }
786 return (0);
787 }
788 /* }}} int cj_config_add_database */
790 static int cj_config (oconfig_item_t *ci) /* {{{ */
791 {
792 int success;
793 int errors;
794 int status;
795 int i;
797 success = 0;
798 errors = 0;
800 for (i = 0; i < ci->children_num; i++)
801 {
802 oconfig_item_t *child = ci->children + i;
804 if (strcasecmp ("Sock", child->key) == 0
805 || strcasecmp ("URL", child->key) == 0)
806 {
807 status = cj_config_add_url (child);
808 if (status == 0)
809 success++;
810 else
811 errors++;
812 }
813 else
814 {
815 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
816 errors++;
817 }
818 }
820 if ((success == 0) && (errors > 0))
821 {
822 ERROR ("curl_json plugin: All statements failed.");
823 return (-1);
824 }
826 return (0);
827 } /* }}} int cj_config */
829 /* }}} End of configuration handling functions */
831 static void cj_submit (cj_t *db, cj_key_t *key, value_t *value) /* {{{ */
832 {
833 value_list_t vl = VALUE_LIST_INIT;
834 char *host;
836 vl.values = value;
837 vl.values_len = 1;
839 if ((db->host == NULL)
840 || (strcmp ("", db->host) == 0)
841 || (strcmp (CJ_DEFAULT_HOST, db->host) == 0))
842 host = hostname_g;
843 else
844 host = db->host;
846 if (key->instance == NULL)
847 {
848 int i, len = 0;
849 for (i = 0; i < db->depth; i++)
850 len += ssnprintf(vl.type_instance+len, sizeof(vl.type_instance)-len,
851 i ? "-%s" : "%s", db->state[i+1].name);
852 }
853 else
854 sstrncpy (vl.type_instance, key->instance, sizeof (vl.type_instance));
856 sstrncpy (vl.host, host, sizeof (vl.host));
857 sstrncpy (vl.plugin, "curl_json", sizeof (vl.plugin));
858 sstrncpy (vl.plugin_instance, db->instance, sizeof (vl.plugin_instance));
859 sstrncpy (vl.type, key->type, sizeof (vl.type));
861 if (db->interval > 0)
862 vl.interval = db->interval;
864 plugin_dispatch_values (&vl);
865 } /* }}} int cj_submit */
867 static int cj_sock_perform (cj_t *db) /* {{{ */
868 {
869 char errbuf[1024];
870 struct sockaddr_un sa_unix = {};
871 sa_unix.sun_family = AF_UNIX;
872 sstrncpy (sa_unix.sun_path, db->sock, sizeof (sa_unix.sun_path));
874 int fd = socket (AF_UNIX, SOCK_STREAM, 0);
875 if (fd < 0)
876 return (-1);
877 if (connect (fd, (struct sockaddr *)&sa_unix, sizeof(sa_unix)) < 0)
878 {
879 ERROR ("curl_json plugin: connect(%s) failed: %s",
880 (db->sock != NULL) ? db->sock : "<null>",
881 sstrerror(errno, errbuf, sizeof (errbuf)));
882 close (fd);
883 return (-1);
884 }
886 ssize_t red;
887 do {
888 unsigned char buffer[4096];
889 red = read (fd, buffer, sizeof(buffer));
890 if (red < 0) {
891 ERROR ("curl_json plugin: read(%s) failed: %s",
892 (db->sock != NULL) ? db->sock : "<null>",
893 sstrerror(errno, errbuf, sizeof (errbuf)));
894 close (fd);
895 return (-1);
896 }
897 if (!cj_curl_callback (buffer, red, 1, db))
898 break;
899 } while (red > 0);
900 close (fd);
901 return (0);
902 } /* }}} int cj_sock_perform */
905 static int cj_curl_perform(cj_t *db) /* {{{ */
906 {
907 int status;
908 long rc;
909 char *url;
910 url = db->url;
912 status = curl_easy_perform (db->curl);
913 if (status != CURLE_OK)
914 {
915 ERROR ("curl_json plugin: curl_easy_perform failed with status %i: %s (%s)",
916 status, db->curl_errbuf, url);
917 return (-1);
918 }
920 curl_easy_getinfo(db->curl, CURLINFO_EFFECTIVE_URL, &url);
921 curl_easy_getinfo(db->curl, CURLINFO_RESPONSE_CODE, &rc);
923 /* The response code is zero if a non-HTTP transport was used. */
924 if ((rc != 0) && (rc != 200))
925 {
926 ERROR ("curl_json plugin: curl_easy_perform failed with "
927 "response code %ld (%s)", rc, url);
928 return (-1);
929 }
930 return (0);
931 } /* }}} int cj_curl_perform */
933 static int cj_perform (cj_t *db) /* {{{ */
934 {
935 int status;
936 yajl_handle yprev = db->yajl;
938 db->yajl = yajl_alloc (&ycallbacks,
939 #if HAVE_YAJL_V2
940 /* alloc funcs = */ NULL,
941 #else
942 /* alloc funcs = */ NULL, NULL,
943 #endif
944 /* context = */ (void *)db);
945 if (db->yajl == NULL)
946 {
947 ERROR ("curl_json plugin: yajl_alloc failed.");
948 db->yajl = yprev;
949 return (-1);
950 }
952 if (db->url)
953 status = cj_curl_perform (db);
954 else
955 status = cj_sock_perform (db);
956 if (status < 0)
957 {
958 yajl_free (db->yajl);
959 db->yajl = yprev;
960 return (-1);
961 }
963 #if HAVE_YAJL_V2
964 status = yajl_complete_parse(db->yajl);
965 #else
966 status = yajl_parse_complete(db->yajl);
967 #endif
968 if (status != yajl_status_ok)
969 {
970 unsigned char *errmsg;
972 errmsg = yajl_get_error (db->yajl, /* verbose = */ 0,
973 /* jsonText = */ NULL, /* jsonTextLen = */ 0);
974 ERROR ("curl_json plugin: yajl_parse_complete failed: %s",
975 (char *) errmsg);
976 yajl_free_error (db->yajl, errmsg);
977 yajl_free (db->yajl);
978 db->yajl = yprev;
979 return (-1);
980 }
982 yajl_free (db->yajl);
983 db->yajl = yprev;
984 return (0);
985 } /* }}} int cj_perform */
987 static int cj_read (user_data_t *ud) /* {{{ */
988 {
989 cj_t *db;
991 if ((ud == NULL) || (ud->data == NULL))
992 {
993 ERROR ("curl_json plugin: cj_read: Invalid user data.");
994 return (-1);
995 }
997 db = (cj_t *) ud->data;
999 db->depth = 0;
1000 memset (&db->state, 0, sizeof(db->state));
1001 db->state[db->depth].tree = db->tree;
1002 db->key = NULL;
1004 return cj_perform (db);
1005 } /* }}} int cj_read */
1007 static int cj_init (void) /* {{{ */
1008 {
1009 /* Call this while collectd is still single-threaded to avoid
1010 * initialization issues in libgcrypt. */
1011 curl_global_init (CURL_GLOBAL_SSL);
1012 return (0);
1013 } /* }}} int cj_init */
1015 void module_register (void)
1016 {
1017 plugin_register_complex_config ("curl_json", cj_config);
1018 plugin_register_init ("curl_json", cj_init);
1019 } /* void module_register */
1021 /* vim: set sw=2 sts=2 et fdm=marker : */