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 if (status != yajl_status_ok)
136 {
137 unsigned char *msg =
138 yajl_get_error(db->yajl, /* verbose = */ 1,
139 /* jsonText = */ (unsigned char *) buf, (unsigned int) len);
140 ERROR ("curl_json plugin: yajl_parse failed: %s", msg);
141 yajl_free_error(db->yajl, msg);
142 return (0); /* abort write callback */
143 }
145 return (len);
146 } /* }}} size_t cj_curl_callback */
148 static int cj_get_type (cj_key_t *key)
149 {
150 const data_set_t *ds;
152 ds = plugin_get_ds (key->type);
153 if (ds == NULL)
154 {
155 static char type[DATA_MAX_NAME_LEN] = "!!!invalid!!!";
157 assert (key->type != NULL);
158 if (strcmp (type, key->type) != 0)
159 {
160 ERROR ("curl_json plugin: Unable to look up DS type \"%s\".",
161 key->type);
162 sstrncpy (type, key->type, sizeof (type));
163 }
165 return -1;
166 }
167 else if (ds->ds_num > 1)
168 {
169 static c_complain_t complaint = C_COMPLAIN_INIT_STATIC;
171 c_complain_once (LOG_WARNING, &complaint,
172 "curl_json plugin: The type \"%s\" has more than one data source. "
173 "This is currently not supported. I will return the type of the "
174 "first data source, but this will likely lead to problems later on.",
175 key->type);
176 }
178 return ds->ds[0].type;
179 }
181 static int cj_cb_map_key (void *ctx, const unsigned char *val,
182 yajl_len_t len);
184 static void cj_cb_inc_array_index (void *ctx, _Bool update_key)
185 {
186 cj_t *db = (cj_t *)ctx;
188 if (!db->state[db->depth].in_array)
189 return;
191 db->state[db->depth].index++;
193 if (update_key)
194 {
195 char name[DATA_MAX_NAME_LEN];
197 ssnprintf (name, sizeof (name), "%d", db->state[db->depth].index - 1);
199 cj_cb_map_key (ctx, (unsigned char *)name, (yajl_len_t) strlen (name));
200 }
201 }
203 /* yajl callbacks */
204 #define CJ_CB_ABORT 0
205 #define CJ_CB_CONTINUE 1
207 static int cj_cb_boolean (void * ctx, int boolVal)
208 {
209 cj_cb_inc_array_index (ctx, /* update_key = */ 0);
210 return (CJ_CB_CONTINUE);
211 }
213 static int cj_cb_null (void * ctx)
214 {
215 cj_cb_inc_array_index (ctx, /* update_key = */ 0);
216 return (CJ_CB_CONTINUE);
217 }
219 static int cj_cb_number (void *ctx,
220 const char *number, yajl_len_t number_len)
221 {
222 char buffer[number_len + 1];
224 cj_t *db = (cj_t *)ctx;
225 cj_key_t *key = db->state[db->depth].key;
226 value_t vt;
227 int type;
228 int status;
230 /* Create a null-terminated version of the string. */
231 memcpy (buffer, number, number_len);
232 buffer[sizeof (buffer) - 1] = 0;
234 if ((key == NULL) || !CJ_IS_KEY (key)) {
235 if (key != NULL && !db->state[db->depth].in_array/*can be inhomogeneous*/)
236 NOTICE ("curl_json plugin: Found \"%s\", but the configuration expects"
237 " a map.", buffer);
238 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
239 key = db->state[db->depth].key;
240 if (key == NULL) {
241 return (CJ_CB_CONTINUE);
242 }
243 }
244 else
245 {
246 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
247 }
249 type = cj_get_type (key);
250 status = parse_value (buffer, &vt, type);
251 if (status != 0)
252 {
253 NOTICE ("curl_json plugin: Unable to parse number: \"%s\"", buffer);
254 return (CJ_CB_CONTINUE);
255 }
257 cj_submit (db, key, &vt);
258 return (CJ_CB_CONTINUE);
259 } /* int cj_cb_number */
261 /* Queries the key-tree of the parent context for "in_name" and, if found,
262 * updates the "key" field of the current context. Otherwise, "key" is set to
263 * NULL. */
264 static int cj_cb_map_key (void *ctx,
265 unsigned char const *in_name, yajl_len_t in_name_len)
266 {
267 cj_t *db = (cj_t *)ctx;
268 c_avl_tree_t *tree;
270 tree = db->state[db->depth-1].tree;
272 if (tree != NULL)
273 {
274 cj_key_t *value = NULL;
275 char *name;
276 size_t name_len;
278 /* Create a null-terminated version of the name. */
279 name = db->state[db->depth].name;
280 name_len = COUCH_MIN ((size_t) in_name_len,
281 sizeof (db->state[db->depth].name) - 1);
282 memcpy (name, in_name, name_len);
283 name[name_len] = 0;
285 if (c_avl_get (tree, name, (void *) &value) == 0) {
286 if (CJ_IS_KEY((cj_key_t*)value)) {
287 db->state[db->depth].key = value;
288 }
289 else {
290 db->state[db->depth].tree = (c_avl_tree_t*) value;
291 }
292 }
293 else if (c_avl_get (tree, CJ_ANY, (void *) &value) == 0)
294 if (CJ_IS_KEY((cj_key_t*)value)) {
295 db->state[db->depth].key = value;
296 }
297 else {
298 db->state[db->depth].tree = (c_avl_tree_t*) value;
299 }
300 else
301 db->state[db->depth].key = NULL;
302 }
304 return (CJ_CB_CONTINUE);
305 }
307 static int cj_cb_string (void *ctx, const unsigned char *val,
308 yajl_len_t len)
309 {
310 /* Handle the string as if it was a number. */
311 return (cj_cb_number (ctx, (const char *) val, len));
312 } /* int cj_cb_string */
314 static int cj_cb_start (void *ctx)
315 {
316 cj_t *db = (cj_t *)ctx;
317 if (++db->depth >= YAJL_MAX_DEPTH)
318 {
319 ERROR ("curl_json plugin: %s depth exceeds max, aborting.",
320 db->url ? db->url : db->sock);
321 return (CJ_CB_ABORT);
322 }
323 return (CJ_CB_CONTINUE);
324 }
326 static int cj_cb_end (void *ctx)
327 {
328 cj_t *db = (cj_t *)ctx;
329 db->state[db->depth].tree = NULL;
330 --db->depth;
331 return (CJ_CB_CONTINUE);
332 }
334 static int cj_cb_start_map (void *ctx)
335 {
336 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
337 return cj_cb_start (ctx);
338 }
340 static int cj_cb_end_map (void *ctx)
341 {
342 return cj_cb_end (ctx);
343 }
345 static int cj_cb_start_array (void * ctx)
346 {
347 cj_t *db = (cj_t *)ctx;
348 cj_cb_inc_array_index (ctx, /* update_key = */ 1);
349 if (db->depth+1 < YAJL_MAX_DEPTH) {
350 db->state[db->depth+1].in_array = 1;
351 db->state[db->depth+1].index = 0;
352 }
353 return cj_cb_start (ctx);
354 }
356 static int cj_cb_end_array (void * ctx)
357 {
358 cj_t *db = (cj_t *)ctx;
359 db->state[db->depth].in_array = 0;
360 return cj_cb_end (ctx);
361 }
363 static yajl_callbacks ycallbacks = {
364 cj_cb_null, /* null */
365 cj_cb_boolean, /* boolean */
366 NULL, /* integer */
367 NULL, /* double */
368 cj_cb_number,
369 cj_cb_string,
370 cj_cb_start_map,
371 cj_cb_map_key,
372 cj_cb_end_map,
373 cj_cb_start_array,
374 cj_cb_end_array
375 };
377 /* end yajl callbacks */
379 static void cj_key_free (cj_key_t *key) /* {{{ */
380 {
381 if (key == NULL)
382 return;
384 sfree (key->path);
385 sfree (key->type);
386 sfree (key->instance);
388 sfree (key);
389 } /* }}} void cj_key_free */
391 static void cj_tree_free (c_avl_tree_t *tree) /* {{{ */
392 {
393 char *name;
394 void *value;
396 while (c_avl_pick (tree, (void *) &name, (void *) &value) == 0)
397 {
398 cj_key_t *key = (cj_key_t *)value;
400 if (CJ_IS_KEY(key))
401 cj_key_free (key);
402 else
403 cj_tree_free ((c_avl_tree_t *)value);
405 sfree (name);
406 }
408 c_avl_destroy (tree);
409 } /* }}} void cj_tree_free */
411 static void cj_free (void *arg) /* {{{ */
412 {
413 cj_t *db;
415 DEBUG ("curl_json plugin: cj_free (arg = %p);", arg);
417 db = (cj_t *) arg;
419 if (db == NULL)
420 return;
422 if (db->curl != NULL)
423 curl_easy_cleanup (db->curl);
424 db->curl = NULL;
426 if (db->tree != NULL)
427 cj_tree_free (db->tree);
428 db->tree = NULL;
430 sfree (db->instance);
431 sfree (db->host);
433 sfree (db->sock);
435 sfree (db->url);
436 sfree (db->user);
437 sfree (db->pass);
438 sfree (db->credentials);
439 sfree (db->cacert);
440 sfree (db->post_body);
441 curl_slist_free_all (db->headers);
443 sfree (db);
444 } /* }}} void cj_free */
446 /* Configuration handling functions {{{ */
448 static c_avl_tree_t *cj_avl_create(void)
449 {
450 return c_avl_create ((int (*) (const void *, const void *)) strcmp);
451 }
453 static int cj_config_append_string (const char *name, struct curl_slist **dest, /* {{{ */
454 oconfig_item_t *ci)
455 {
456 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
457 {
458 WARNING ("curl_json plugin: `%s' needs exactly one string argument.", name);
459 return (-1);
460 }
462 *dest = curl_slist_append(*dest, ci->values[0].value.string);
463 if (*dest == NULL)
464 return (-1);
466 return (0);
467 } /* }}} int cj_config_append_string */
469 static int cj_config_add_key (cj_t *db, /* {{{ */
470 oconfig_item_t *ci)
471 {
472 cj_key_t *key;
473 int status;
474 int i;
476 if ((ci->values_num != 1)
477 || (ci->values[0].type != OCONFIG_TYPE_STRING))
478 {
479 WARNING ("curl_json plugin: The `Key' block "
480 "needs exactly one string argument.");
481 return (-1);
482 }
484 key = (cj_key_t *) malloc (sizeof (*key));
485 if (key == NULL)
486 {
487 ERROR ("curl_json plugin: malloc failed.");
488 return (-1);
489 }
490 memset (key, 0, sizeof (*key));
491 key->magic = CJ_KEY_MAGIC;
493 if (strcasecmp ("Key", ci->key) == 0)
494 {
495 status = cf_util_get_string (ci, &key->path);
496 if (status != 0)
497 {
498 sfree (key);
499 return (status);
500 }
501 }
502 else
503 {
504 ERROR ("curl_json plugin: cj_config: "
505 "Invalid key: %s", ci->key);
506 cj_key_free (key);
507 return (-1);
508 }
510 status = 0;
511 for (i = 0; i < ci->children_num; i++)
512 {
513 oconfig_item_t *child = ci->children + i;
515 if (strcasecmp ("Type", child->key) == 0)
516 status = cf_util_get_string (child, &key->type);
517 else if (strcasecmp ("Instance", child->key) == 0)
518 status = cf_util_get_string (child, &key->instance);
519 else
520 {
521 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
522 status = -1;
523 }
525 if (status != 0)
526 break;
527 } /* for (i = 0; i < ci->children_num; i++) */
529 while (status == 0)
530 {
531 if (key->type == NULL)
532 {
533 WARNING ("curl_json plugin: `Type' missing in `Key' block.");
534 status = -1;
535 }
537 break;
538 } /* while (status == 0) */
540 /* store path in a tree that will match the json map structure, example:
541 * "httpd/requests/count",
542 * "httpd/requests/current" ->
543 * { "httpd": { "requests": { "count": $key, "current": $key } } }
544 */
545 if (status == 0)
546 {
547 char *ptr;
548 char *name;
549 char ent[PATH_MAX];
550 c_avl_tree_t *tree;
552 if (db->tree == NULL)
553 db->tree = cj_avl_create();
555 tree = db->tree;
556 ptr = key->path;
557 if (*ptr == '/')
558 ++ptr;
560 name = ptr;
561 while (*ptr)
562 {
563 if (*ptr == '/')
564 {
565 c_avl_tree_t *value;
566 int len;
568 len = ptr-name;
569 if (len == 0)
570 break;
571 len = COUCH_MIN(len, sizeof (ent)-1);
572 sstrncpy (ent, name, len+1);
574 if (c_avl_get (tree, ent, (void *) &value) != 0)
575 {
576 value = cj_avl_create ();
577 c_avl_insert (tree, strdup (ent), value);
578 }
580 tree = value;
581 name = ptr+1;
582 }
583 ++ptr;
584 }
585 if (*name)
586 c_avl_insert (tree, strdup(name), key);
587 else
588 {
589 ERROR ("curl_json plugin: invalid key: %s", key->path);
590 status = -1;
591 }
592 }
594 return (status);
595 } /* }}} int cj_config_add_key */
597 static int cj_init_curl (cj_t *db) /* {{{ */
598 {
599 db->curl = curl_easy_init ();
600 if (db->curl == NULL)
601 {
602 ERROR ("curl_json plugin: curl_easy_init failed.");
603 return (-1);
604 }
606 curl_easy_setopt (db->curl, CURLOPT_NOSIGNAL, 1L);
607 curl_easy_setopt (db->curl, CURLOPT_WRITEFUNCTION, cj_curl_callback);
608 curl_easy_setopt (db->curl, CURLOPT_WRITEDATA, db);
609 curl_easy_setopt (db->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
610 curl_easy_setopt (db->curl, CURLOPT_ERRORBUFFER, db->curl_errbuf);
611 curl_easy_setopt (db->curl, CURLOPT_URL, db->url);
612 curl_easy_setopt (db->curl, CURLOPT_FOLLOWLOCATION, 1L);
613 curl_easy_setopt (db->curl, CURLOPT_MAXREDIRS, 50L);
615 if (db->user != NULL)
616 {
617 #ifdef HAVE_CURLOPT_USERNAME
618 curl_easy_setopt (db->curl, CURLOPT_USERNAME, db->user);
619 curl_easy_setopt (db->curl, CURLOPT_PASSWORD,
620 (db->pass == NULL) ? "" : db->pass);
621 #else
622 size_t credentials_size;
624 credentials_size = strlen (db->user) + 2;
625 if (db->pass != NULL)
626 credentials_size += strlen (db->pass);
628 db->credentials = (char *) malloc (credentials_size);
629 if (db->credentials == NULL)
630 {
631 ERROR ("curl_json plugin: malloc failed.");
632 return (-1);
633 }
635 ssnprintf (db->credentials, credentials_size, "%s:%s",
636 db->user, (db->pass == NULL) ? "" : db->pass);
637 curl_easy_setopt (db->curl, CURLOPT_USERPWD, db->credentials);
638 #endif
640 if (db->digest)
641 curl_easy_setopt (db->curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
642 }
644 curl_easy_setopt (db->curl, CURLOPT_SSL_VERIFYPEER, (long) db->verify_peer);
645 curl_easy_setopt (db->curl, CURLOPT_SSL_VERIFYHOST,
646 db->verify_host ? 2L : 0L);
647 if (db->cacert != NULL)
648 curl_easy_setopt (db->curl, CURLOPT_CAINFO, db->cacert);
649 if (db->headers != NULL)
650 curl_easy_setopt (db->curl, CURLOPT_HTTPHEADER, db->headers);
651 if (db->post_body != NULL)
652 curl_easy_setopt (db->curl, CURLOPT_POSTFIELDS, db->post_body);
654 #ifdef HAVE_CURLOPT_TIMEOUT_MS
655 if (db->timeout >= 0)
656 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS, (long) db->timeout);
657 else if (db->interval > 0)
658 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS,
659 CDTIME_T_TO_MS(db->timeout));
660 else
661 curl_easy_setopt (db->curl, CURLOPT_TIMEOUT_MS,
662 CDTIME_T_TO_MS(plugin_get_interval()));
663 #endif
665 return (0);
666 } /* }}} int cj_init_curl */
668 static int cj_config_add_url (oconfig_item_t *ci) /* {{{ */
669 {
670 cj_t *db;
671 int status = 0;
672 int i;
674 if ((ci->values_num != 1)
675 || (ci->values[0].type != OCONFIG_TYPE_STRING))
676 {
677 WARNING ("curl_json plugin: The `URL' block "
678 "needs exactly one string argument.");
679 return (-1);
680 }
682 db = (cj_t *) malloc (sizeof (*db));
683 if (db == NULL)
684 {
685 ERROR ("curl_json plugin: malloc failed.");
686 return (-1);
687 }
688 memset (db, 0, sizeof (*db));
690 db->timeout = -1;
692 if (strcasecmp ("URL", ci->key) == 0)
693 status = cf_util_get_string (ci, &db->url);
694 else if (strcasecmp ("Sock", ci->key) == 0)
695 status = cf_util_get_string (ci, &db->sock);
696 else
697 {
698 ERROR ("curl_json plugin: cj_config: "
699 "Invalid key: %s", ci->key);
700 cj_free (db);
701 return (-1);
702 }
703 if (status != 0)
704 {
705 sfree (db);
706 return (status);
707 }
709 /* Fill the `cj_t' structure.. */
710 for (i = 0; i < ci->children_num; i++)
711 {
712 oconfig_item_t *child = ci->children + i;
714 if (strcasecmp ("Instance", child->key) == 0)
715 status = cf_util_get_string (child, &db->instance);
716 else if (strcasecmp ("Host", child->key) == 0)
717 status = cf_util_get_string (child, &db->host);
718 else if (db->url && strcasecmp ("User", child->key) == 0)
719 status = cf_util_get_string (child, &db->user);
720 else if (db->url && strcasecmp ("Password", child->key) == 0)
721 status = cf_util_get_string (child, &db->pass);
722 else if (strcasecmp ("Digest", child->key) == 0)
723 status = cf_util_get_boolean (child, &db->digest);
724 else if (db->url && strcasecmp ("VerifyPeer", child->key) == 0)
725 status = cf_util_get_boolean (child, &db->verify_peer);
726 else if (db->url && strcasecmp ("VerifyHost", child->key) == 0)
727 status = cf_util_get_boolean (child, &db->verify_host);
728 else if (db->url && strcasecmp ("CACert", child->key) == 0)
729 status = cf_util_get_string (child, &db->cacert);
730 else if (db->url && strcasecmp ("Header", child->key) == 0)
731 status = cj_config_append_string ("Header", &db->headers, child);
732 else if (db->url && strcasecmp ("Post", child->key) == 0)
733 status = cf_util_get_string (child, &db->post_body);
734 else if (strcasecmp ("Key", child->key) == 0)
735 status = cj_config_add_key (db, child);
736 else if (strcasecmp ("Interval", child->key) == 0)
737 status = cf_util_get_cdtime(child, &db->interval);
738 else if (strcasecmp ("Timeout", child->key) == 0)
739 status = cf_util_get_int (child, &db->timeout);
740 else
741 {
742 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
743 status = -1;
744 }
746 if (status != 0)
747 break;
748 }
750 if (status == 0)
751 {
752 if (db->tree == NULL)
753 {
754 WARNING ("curl_json plugin: No (valid) `Key' block within `%s' \"`%s'\".",
755 db->url ? "URL" : "Sock", db->url ? db->url : db->sock);
756 status = -1;
757 }
758 if (status == 0 && db->url)
759 status = cj_init_curl (db);
760 }
762 /* If all went well, register this database for reading */
763 if (status == 0)
764 {
765 user_data_t ud;
766 char *cb_name;
767 struct timespec interval = { 0, 0 };
769 CDTIME_T_TO_TIMESPEC (db->interval, &interval);
771 if (db->instance == NULL)
772 db->instance = strdup("default");
774 DEBUG ("curl_json plugin: Registering new read callback: %s",
775 db->instance);
777 memset (&ud, 0, sizeof (ud));
778 ud.data = (void *) db;
779 ud.free_func = cj_free;
781 cb_name = ssnprintf_alloc ("curl_json-%s-%s",
782 db->instance, db->url ? db->url : db->sock);
784 plugin_register_complex_read (/* group = */ NULL, cb_name, cj_read,
785 /* interval = */ (db->interval > 0) ? &interval : NULL,
786 &ud);
787 sfree (cb_name);
788 }
789 else
790 {
791 cj_free (db);
792 return (-1);
793 }
795 return (0);
796 }
797 /* }}} int cj_config_add_database */
799 static int cj_config (oconfig_item_t *ci) /* {{{ */
800 {
801 int success;
802 int errors;
803 int status;
804 int i;
806 success = 0;
807 errors = 0;
809 for (i = 0; i < ci->children_num; i++)
810 {
811 oconfig_item_t *child = ci->children + i;
813 if (strcasecmp ("Sock", child->key) == 0
814 || strcasecmp ("URL", child->key) == 0)
815 {
816 status = cj_config_add_url (child);
817 if (status == 0)
818 success++;
819 else
820 errors++;
821 }
822 else
823 {
824 WARNING ("curl_json plugin: Option `%s' not allowed here.", child->key);
825 errors++;
826 }
827 }
829 if ((success == 0) && (errors > 0))
830 {
831 ERROR ("curl_json plugin: All statements failed.");
832 return (-1);
833 }
835 return (0);
836 } /* }}} int cj_config */
838 /* }}} End of configuration handling functions */
840 static void cj_submit (cj_t *db, cj_key_t *key, value_t *value) /* {{{ */
841 {
842 value_list_t vl = VALUE_LIST_INIT;
843 char *host;
845 vl.values = value;
846 vl.values_len = 1;
848 if ((db->host == NULL)
849 || (strcmp ("", db->host) == 0)
850 || (strcmp (CJ_DEFAULT_HOST, db->host) == 0))
851 host = hostname_g;
852 else
853 host = db->host;
855 if (key->instance == NULL)
856 {
857 int i, len = 0;
858 for (i = 0; i < db->depth; i++)
859 len += ssnprintf(vl.type_instance+len, sizeof(vl.type_instance)-len,
860 i ? "-%s" : "%s", db->state[i+1].name);
861 }
862 else
863 sstrncpy (vl.type_instance, key->instance, sizeof (vl.type_instance));
865 sstrncpy (vl.host, host, sizeof (vl.host));
866 sstrncpy (vl.plugin, "curl_json", sizeof (vl.plugin));
867 sstrncpy (vl.plugin_instance, db->instance, sizeof (vl.plugin_instance));
868 sstrncpy (vl.type, key->type, sizeof (vl.type));
870 if (db->interval > 0)
871 vl.interval = db->interval;
873 plugin_dispatch_values (&vl);
874 } /* }}} int cj_submit */
876 static int cj_sock_perform (cj_t *db) /* {{{ */
877 {
878 char errbuf[1024];
879 struct sockaddr_un sa_unix = {};
880 sa_unix.sun_family = AF_UNIX;
881 sstrncpy (sa_unix.sun_path, db->sock, sizeof (sa_unix.sun_path));
883 int fd = socket (AF_UNIX, SOCK_STREAM, 0);
884 if (fd < 0)
885 return (-1);
886 if (connect (fd, (struct sockaddr *)&sa_unix, sizeof(sa_unix)) < 0)
887 {
888 ERROR ("curl_json plugin: connect(%s) failed: %s",
889 (db->sock != NULL) ? db->sock : "<null>",
890 sstrerror(errno, errbuf, sizeof (errbuf)));
891 close (fd);
892 return (-1);
893 }
895 ssize_t red;
896 do {
897 unsigned char buffer[4096];
898 red = read (fd, buffer, sizeof(buffer));
899 if (red < 0) {
900 ERROR ("curl_json plugin: read(%s) failed: %s",
901 (db->sock != NULL) ? db->sock : "<null>",
902 sstrerror(errno, errbuf, sizeof (errbuf)));
903 close (fd);
904 return (-1);
905 }
906 if (!cj_curl_callback (buffer, red, 1, db))
907 break;
908 } while (red > 0);
909 close (fd);
910 return (0);
911 } /* }}} int cj_sock_perform */
914 static int cj_curl_perform(cj_t *db) /* {{{ */
915 {
916 int status;
917 long rc;
918 char *url;
919 url = db->url;
921 status = curl_easy_perform (db->curl);
922 if (status != CURLE_OK)
923 {
924 ERROR ("curl_json plugin: curl_easy_perform failed with status %i: %s (%s)",
925 status, db->curl_errbuf, url);
926 return (-1);
927 }
929 curl_easy_getinfo(db->curl, CURLINFO_EFFECTIVE_URL, &url);
930 curl_easy_getinfo(db->curl, CURLINFO_RESPONSE_CODE, &rc);
932 /* The response code is zero if a non-HTTP transport was used. */
933 if ((rc != 0) && (rc != 200))
934 {
935 ERROR ("curl_json plugin: curl_easy_perform failed with "
936 "response code %ld (%s)", rc, url);
937 return (-1);
938 }
939 return (0);
940 } /* }}} int cj_curl_perform */
942 static int cj_perform (cj_t *db) /* {{{ */
943 {
944 int status;
945 yajl_handle yprev = db->yajl;
947 db->yajl = yajl_alloc (&ycallbacks,
948 #if HAVE_YAJL_V2
949 /* alloc funcs = */ NULL,
950 #else
951 /* alloc funcs = */ NULL, NULL,
952 #endif
953 /* context = */ (void *)db);
954 if (db->yajl == NULL)
955 {
956 ERROR ("curl_json plugin: yajl_alloc failed.");
957 db->yajl = yprev;
958 return (-1);
959 }
961 if (db->url)
962 status = cj_curl_perform (db);
963 else
964 status = cj_sock_perform (db);
965 if (status < 0)
966 {
967 yajl_free (db->yajl);
968 db->yajl = yprev;
969 return (-1);
970 }
972 #if HAVE_YAJL_V2
973 status = yajl_complete_parse(db->yajl);
974 #else
975 status = yajl_parse_complete(db->yajl);
976 #endif
977 if (status != yajl_status_ok)
978 {
979 unsigned char *errmsg;
981 errmsg = yajl_get_error (db->yajl, /* verbose = */ 0,
982 /* jsonText = */ NULL, /* jsonTextLen = */ 0);
983 ERROR ("curl_json plugin: yajl_parse_complete failed: %s",
984 (char *) errmsg);
985 yajl_free_error (db->yajl, errmsg);
986 yajl_free (db->yajl);
987 db->yajl = yprev;
988 return (-1);
989 }
991 yajl_free (db->yajl);
992 db->yajl = yprev;
993 return (0);
994 } /* }}} int cj_perform */
996 static int cj_read (user_data_t *ud) /* {{{ */
997 {
998 cj_t *db;
1000 if ((ud == NULL) || (ud->data == NULL))
1001 {
1002 ERROR ("curl_json plugin: cj_read: Invalid user data.");
1003 return (-1);
1004 }
1006 db = (cj_t *) ud->data;
1008 db->depth = 0;
1009 memset (&db->state, 0, sizeof(db->state));
1010 db->state[db->depth].tree = db->tree;
1011 db->key = NULL;
1013 return cj_perform (db);
1014 } /* }}} int cj_read */
1016 static int cj_init (void) /* {{{ */
1017 {
1018 /* Call this while collectd is still single-threaded to avoid
1019 * initialization issues in libgcrypt. */
1020 curl_global_init (CURL_GLOBAL_SSL);
1021 return (0);
1022 } /* }}} int cj_init */
1024 void module_register (void)
1025 {
1026 plugin_register_complex_config ("curl_json", cj_config);
1027 plugin_register_init ("curl_json", cj_init);
1028 } /* void module_register */
1030 /* vim: set sw=2 sts=2 et fdm=marker : */