1 /**
2 * collectd - src/apache.c
3 * Copyright (C) 2006-2010 Florian octo Forster
4 * Copyright (C) 2007 Florent EppO Monbillard
5 * Copyright (C) 2009 Amit Gupta
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 * Florent EppO Monbillard <eppo at darox.net>
23 * - connections/lighttpd extension
24 * Amit Gupta <amit.gupta221 at gmail.com>
25 **/
27 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
32 #include <curl/curl.h>
34 enum server_enum { APACHE = 0, LIGHTTPD };
36 struct apache_s {
37 int server_type;
38 char *name;
39 char *host;
40 char *url;
41 char *user;
42 char *pass;
43 _Bool verify_peer;
44 _Bool verify_host;
45 char *cacert;
46 char *ssl_ciphers;
47 char *server; /* user specific server type */
48 char *apache_buffer;
49 char apache_curl_error[CURL_ERROR_SIZE];
50 size_t apache_buffer_size;
51 size_t apache_buffer_fill;
52 int timeout;
53 CURL *curl;
54 }; /* apache_s */
56 typedef struct apache_s apache_t;
58 /* TODO: Remove this prototype */
59 static int apache_read_host(user_data_t *user_data);
61 static void apache_free(void *arg) {
62 apache_t *st = arg;
64 if (st == NULL)
65 return;
67 sfree(st->name);
68 sfree(st->host);
69 sfree(st->url);
70 sfree(st->user);
71 sfree(st->pass);
72 sfree(st->cacert);
73 sfree(st->ssl_ciphers);
74 sfree(st->server);
75 sfree(st->apache_buffer);
76 if (st->curl) {
77 curl_easy_cleanup(st->curl);
78 st->curl = NULL;
79 }
80 sfree(st);
81 } /* apache_free */
83 static size_t apache_curl_callback(void *buf, size_t size, size_t nmemb,
84 void *user_data) {
85 size_t len = size * nmemb;
86 apache_t *st;
88 st = user_data;
89 if (st == NULL) {
90 ERROR("apache plugin: apache_curl_callback: "
91 "user_data pointer is NULL.");
92 return (0);
93 }
95 if (len == 0)
96 return (len);
98 if ((st->apache_buffer_fill + len) >= st->apache_buffer_size) {
99 char *temp;
101 temp = realloc(st->apache_buffer, st->apache_buffer_fill + len + 1);
102 if (temp == NULL) {
103 ERROR("apache plugin: realloc failed.");
104 return (0);
105 }
106 st->apache_buffer = temp;
107 st->apache_buffer_size = st->apache_buffer_fill + len + 1;
108 }
110 memcpy(st->apache_buffer + st->apache_buffer_fill, (char *)buf, len);
111 st->apache_buffer_fill += len;
112 st->apache_buffer[st->apache_buffer_fill] = 0;
114 return (len);
115 } /* int apache_curl_callback */
117 static size_t apache_header_callback(void *buf, size_t size, size_t nmemb,
118 void *user_data) {
119 size_t len = size * nmemb;
120 apache_t *st;
122 st = user_data;
123 if (st == NULL) {
124 ERROR("apache plugin: apache_header_callback: "
125 "user_data pointer is NULL.");
126 return (0);
127 }
129 if (len == 0)
130 return (len);
132 /* look for the Server header */
133 if (strncasecmp(buf, "Server: ", strlen("Server: ")) != 0)
134 return (len);
136 if (strstr(buf, "Apache") != NULL)
137 st->server_type = APACHE;
138 else if (strstr(buf, "lighttpd") != NULL)
139 st->server_type = LIGHTTPD;
140 else if (strstr(buf, "IBM_HTTP_Server") != NULL)
141 st->server_type = APACHE;
142 else {
143 const char *hdr = buf;
145 hdr += strlen("Server: ");
146 NOTICE("apache plugin: Unknown server software: %s", hdr);
147 }
149 return (len);
150 } /* apache_header_callback */
152 /* Configuration handling functiions
153 * <Plugin apache>
154 * <Instance "instance_name">
155 * URL ...
156 * </Instance>
157 * URL ...
158 * </Plugin>
159 */
160 static int config_add(oconfig_item_t *ci) {
161 apache_t *st;
162 int status;
164 st = calloc(1, sizeof(*st));
165 if (st == NULL) {
166 ERROR("apache plugin: calloc failed.");
167 return (-1);
168 }
170 st->timeout = -1;
172 status = cf_util_get_string(ci, &st->name);
173 if (status != 0) {
174 sfree(st);
175 return (status);
176 }
177 assert(st->name != NULL);
179 for (int i = 0; i < ci->children_num; i++) {
180 oconfig_item_t *child = ci->children + i;
182 if (strcasecmp("URL", child->key) == 0)
183 status = cf_util_get_string(child, &st->url);
184 else if (strcasecmp("Host", child->key) == 0)
185 status = cf_util_get_string(child, &st->host);
186 else if (strcasecmp("User", child->key) == 0)
187 status = cf_util_get_string(child, &st->user);
188 else if (strcasecmp("Password", child->key) == 0)
189 status = cf_util_get_string(child, &st->pass);
190 else if (strcasecmp("VerifyPeer", child->key) == 0)
191 status = cf_util_get_boolean(child, &st->verify_peer);
192 else if (strcasecmp("VerifyHost", child->key) == 0)
193 status = cf_util_get_boolean(child, &st->verify_host);
194 else if (strcasecmp("CACert", child->key) == 0)
195 status = cf_util_get_string(child, &st->cacert);
196 else if (strcasecmp("SSLCiphers", child->key) == 0)
197 status = cf_util_get_string(child, &st->ssl_ciphers);
198 else if (strcasecmp("Server", child->key) == 0)
199 status = cf_util_get_string(child, &st->server);
200 else if (strcasecmp("Timeout", child->key) == 0)
201 status = cf_util_get_int(child, &st->timeout);
202 else {
203 WARNING("apache plugin: Option `%s' not allowed here.", child->key);
204 status = -1;
205 }
207 if (status != 0)
208 break;
209 }
211 /* Check if struct is complete.. */
212 if ((status == 0) && (st->url == NULL)) {
213 ERROR("apache plugin: Instance `%s': "
214 "No URL has been configured.",
215 st->name);
216 status = -1;
217 }
219 if (status == 0) {
220 user_data_t ud = {.data = st, .free_func = apache_free};
222 char callback_name[3 * DATA_MAX_NAME_LEN];
224 ssnprintf(callback_name, sizeof(callback_name), "apache/%s/%s",
225 (st->host != NULL) ? st->host : hostname_g,
226 (st->name != NULL) ? st->name : "default");
228 status = plugin_register_complex_read(/* group = */ NULL,
229 /* name = */ callback_name,
230 /* callback = */ apache_read_host,
231 /* interval = */ 0,
232 /* user_data = */ &ud);
233 }
235 if (status != 0) {
236 apache_free(st);
237 return (-1);
238 }
240 return (0);
241 } /* int config_add */
243 static int config(oconfig_item_t *ci) {
244 int status = 0;
246 for (int i = 0; i < ci->children_num; i++) {
247 oconfig_item_t *child = ci->children + i;
249 if (strcasecmp("Instance", child->key) == 0)
250 config_add(child);
251 else
252 WARNING("apache plugin: The configuration option "
253 "\"%s\" is not allowed here. Did you "
254 "forget to add an <Instance /> block "
255 "around the configuration?",
256 child->key);
257 } /* for (ci->children) */
259 return (status);
260 } /* int config */
262 /* initialize curl for each host */
263 static int init_host(apache_t *st) /* {{{ */
264 {
265 assert(st->url != NULL);
266 /* (Assured by `config_add') */
268 if (st->curl != NULL) {
269 curl_easy_cleanup(st->curl);
270 st->curl = NULL;
271 }
273 if ((st->curl = curl_easy_init()) == NULL) {
274 ERROR("apache plugin: init_host: `curl_easy_init' failed.");
275 return (-1);
276 }
278 curl_easy_setopt(st->curl, CURLOPT_NOSIGNAL, 1L);
279 curl_easy_setopt(st->curl, CURLOPT_WRITEFUNCTION, apache_curl_callback);
280 curl_easy_setopt(st->curl, CURLOPT_WRITEDATA, st);
282 /* not set as yet if the user specified string doesn't match apache or
283 * lighttpd, then ignore it. Headers will be parsed to find out the
284 * server type */
285 st->server_type = -1;
287 if (st->server != NULL) {
288 if (strcasecmp(st->server, "apache") == 0)
289 st->server_type = APACHE;
290 else if (strcasecmp(st->server, "lighttpd") == 0)
291 st->server_type = LIGHTTPD;
292 else if (strcasecmp(st->server, "ibm_http_server") == 0)
293 st->server_type = APACHE;
294 else
295 WARNING("apache plugin: Unknown `Server' setting: %s", st->server);
296 }
298 /* if not found register a header callback to determine the server_type */
299 if (st->server_type == -1) {
300 curl_easy_setopt(st->curl, CURLOPT_HEADERFUNCTION, apache_header_callback);
301 curl_easy_setopt(st->curl, CURLOPT_WRITEHEADER, st);
302 }
304 curl_easy_setopt(st->curl, CURLOPT_USERAGENT, COLLECTD_USERAGENT);
305 curl_easy_setopt(st->curl, CURLOPT_ERRORBUFFER, st->apache_curl_error);
307 if (st->user != NULL) {
308 #ifdef HAVE_CURLOPT_USERNAME
309 curl_easy_setopt(st->curl, CURLOPT_USERNAME, st->user);
310 curl_easy_setopt(st->curl, CURLOPT_PASSWORD,
311 (st->pass == NULL) ? "" : st->pass);
312 #else
313 static char credentials[1024];
314 int status;
316 status = ssnprintf(credentials, sizeof(credentials), "%s:%s", st->user,
317 (st->pass == NULL) ? "" : st->pass);
318 if ((status < 0) || ((size_t)status >= sizeof(credentials))) {
319 ERROR("apache plugin: init_host: Returning an error "
320 "because the credentials have been "
321 "truncated.");
322 curl_easy_cleanup(st->curl);
323 st->curl = NULL;
324 return (-1);
325 }
327 curl_easy_setopt(st->curl, CURLOPT_USERPWD, credentials);
328 #endif
329 }
331 curl_easy_setopt(st->curl, CURLOPT_URL, st->url);
332 curl_easy_setopt(st->curl, CURLOPT_FOLLOWLOCATION, 1L);
333 curl_easy_setopt(st->curl, CURLOPT_MAXREDIRS, 50L);
335 curl_easy_setopt(st->curl, CURLOPT_SSL_VERIFYPEER, (long)st->verify_peer);
336 curl_easy_setopt(st->curl, CURLOPT_SSL_VERIFYHOST, st->verify_host ? 2L : 0L);
337 if (st->cacert != NULL)
338 curl_easy_setopt(st->curl, CURLOPT_CAINFO, st->cacert);
339 if (st->ssl_ciphers != NULL)
340 curl_easy_setopt(st->curl, CURLOPT_SSL_CIPHER_LIST, st->ssl_ciphers);
342 #ifdef HAVE_CURLOPT_TIMEOUT_MS
343 if (st->timeout >= 0)
344 curl_easy_setopt(st->curl, CURLOPT_TIMEOUT_MS, (long)st->timeout);
345 else
346 curl_easy_setopt(st->curl, CURLOPT_TIMEOUT_MS,
347 (long)CDTIME_T_TO_MS(plugin_get_interval()));
348 #endif
350 return (0);
351 } /* }}} int init_host */
353 static void submit_value(const char *type, const char *type_instance,
354 value_t value, apache_t *st) {
355 value_list_t vl = VALUE_LIST_INIT;
357 vl.values = &value;
358 vl.values_len = 1;
360 sstrncpy(vl.host, (st->host != NULL) ? st->host : hostname_g,
361 sizeof(vl.host));
363 sstrncpy(vl.plugin, "apache", sizeof(vl.plugin));
364 if (st->name != NULL)
365 sstrncpy(vl.plugin_instance, st->name, sizeof(vl.plugin_instance));
367 sstrncpy(vl.type, type, sizeof(vl.type));
368 if (type_instance != NULL)
369 sstrncpy(vl.type_instance, type_instance, sizeof(vl.type_instance));
371 plugin_dispatch_values(&vl);
372 } /* void submit_value */
374 static void submit_derive(const char *type, const char *type_instance,
375 derive_t c, apache_t *st) {
376 value_t v;
377 v.derive = c;
378 submit_value(type, type_instance, v, st);
379 } /* void submit_derive */
381 static void submit_gauge(const char *type, const char *type_instance, gauge_t g,
382 apache_t *st) {
383 value_t v;
384 v.gauge = g;
385 submit_value(type, type_instance, v, st);
386 } /* void submit_gauge */
388 static void submit_scoreboard(char *buf, apache_t *st) {
389 /*
390 * Scoreboard Key:
391 * "_" Waiting for Connection, "S" Starting up,
392 * "R" Reading Request for apache and read-POST for lighttpd,
393 * "W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
394 * "C" Closing connection, "L" Logging, "G" Gracefully finishing,
395 * "I" Idle cleanup of worker, "." Open slot with no current process
396 * Lighttpd specific legends -
397 * "E" hard error, "." connect, "h" handle-request,
398 * "q" request-start, "Q" request-end, "s" response-start
399 * "S" response-end, "r" read
400 */
401 long long open = 0LL;
402 long long waiting = 0LL;
403 long long starting = 0LL;
404 long long reading = 0LL;
405 long long sending = 0LL;
406 long long keepalive = 0LL;
407 long long dnslookup = 0LL;
408 long long closing = 0LL;
409 long long logging = 0LL;
410 long long finishing = 0LL;
411 long long idle_cleanup = 0LL;
413 /* lighttpd specific */
414 long long hard_error = 0LL;
415 long long lighttpd_read = 0LL;
416 long long handle_request = 0LL;
417 long long request_start = 0LL;
418 long long request_end = 0LL;
419 long long response_start = 0LL;
420 long long response_end = 0LL;
422 for (int i = 0; buf[i] != '\0'; i++) {
423 if (buf[i] == '.')
424 open++;
425 else if (buf[i] == '_')
426 waiting++;
427 else if (buf[i] == 'S')
428 starting++;
429 else if (buf[i] == 'R')
430 reading++;
431 else if (buf[i] == 'W')
432 sending++;
433 else if (buf[i] == 'K')
434 keepalive++;
435 else if (buf[i] == 'D')
436 dnslookup++;
437 else if (buf[i] == 'C')
438 closing++;
439 else if (buf[i] == 'L')
440 logging++;
441 else if (buf[i] == 'G')
442 finishing++;
443 else if (buf[i] == 'I')
444 idle_cleanup++;
445 else if (buf[i] == 'r')
446 lighttpd_read++;
447 else if (buf[i] == 'h')
448 handle_request++;
449 else if (buf[i] == 'E')
450 hard_error++;
451 else if (buf[i] == 'q')
452 request_start++;
453 else if (buf[i] == 'Q')
454 request_end++;
455 else if (buf[i] == 's')
456 response_start++;
457 else if (buf[i] == 'S')
458 response_end++;
459 }
461 if (st->server_type == APACHE) {
462 submit_gauge("apache_scoreboard", "open", open, st);
463 submit_gauge("apache_scoreboard", "waiting", waiting, st);
464 submit_gauge("apache_scoreboard", "starting", starting, st);
465 submit_gauge("apache_scoreboard", "reading", reading, st);
466 submit_gauge("apache_scoreboard", "sending", sending, st);
467 submit_gauge("apache_scoreboard", "keepalive", keepalive, st);
468 submit_gauge("apache_scoreboard", "dnslookup", dnslookup, st);
469 submit_gauge("apache_scoreboard", "closing", closing, st);
470 submit_gauge("apache_scoreboard", "logging", logging, st);
471 submit_gauge("apache_scoreboard", "finishing", finishing, st);
472 submit_gauge("apache_scoreboard", "idle_cleanup", idle_cleanup, st);
473 } else {
474 submit_gauge("apache_scoreboard", "connect", open, st);
475 submit_gauge("apache_scoreboard", "close", closing, st);
476 submit_gauge("apache_scoreboard", "hard_error", hard_error, st);
477 submit_gauge("apache_scoreboard", "read", lighttpd_read, st);
478 submit_gauge("apache_scoreboard", "read_post", reading, st);
479 submit_gauge("apache_scoreboard", "write", sending, st);
480 submit_gauge("apache_scoreboard", "handle_request", handle_request, st);
481 submit_gauge("apache_scoreboard", "request_start", request_start, st);
482 submit_gauge("apache_scoreboard", "request_end", request_end, st);
483 submit_gauge("apache_scoreboard", "response_start", response_start, st);
484 submit_gauge("apache_scoreboard", "response_end", response_end, st);
485 }
486 }
488 static int apache_read_host(user_data_t *user_data) /* {{{ */
489 {
490 char *ptr;
491 char *saveptr;
492 char *line;
494 char *fields[4];
495 int fields_num;
497 apache_t *st;
499 st = user_data->data;
501 int status;
503 char *content_type;
504 static const char *text_plain = "text/plain";
506 assert(st->url != NULL);
507 /* (Assured by `config_add') */
509 if (st->curl == NULL) {
510 status = init_host(st);
511 if (status != 0)
512 return (-1);
513 }
514 assert(st->curl != NULL);
516 st->apache_buffer_fill = 0;
517 if (curl_easy_perform(st->curl) != CURLE_OK) {
518 ERROR("apache: curl_easy_perform failed: %s", st->apache_curl_error);
519 return (-1);
520 }
522 /* fallback - server_type to apache if not set at this time */
523 if (st->server_type == -1) {
524 WARNING("apache plugin: Unable to determine server software "
525 "automatically. Will assume Apache.");
526 st->server_type = APACHE;
527 }
529 status = curl_easy_getinfo(st->curl, CURLINFO_CONTENT_TYPE, &content_type);
530 if ((status == CURLE_OK) && (content_type != NULL) &&
531 (strncasecmp(content_type, text_plain, strlen(text_plain)) != 0)) {
532 WARNING("apache plugin: `Content-Type' response header is not `%s' "
533 "(received: `%s'). Expecting unparseable data. Please check `URL' "
534 "parameter (missing `?auto' suffix ?)",
535 text_plain, content_type);
536 }
538 ptr = st->apache_buffer;
539 saveptr = NULL;
540 while ((line = strtok_r(ptr, "\n\r", &saveptr)) != NULL) {
541 ptr = NULL;
542 fields_num = strsplit(line, fields, STATIC_ARRAY_SIZE(fields));
544 if (fields_num == 3) {
545 if ((strcmp(fields[0], "Total") == 0) &&
546 (strcmp(fields[1], "Accesses:") == 0))
547 submit_derive("apache_requests", "", atoll(fields[2]), st);
548 else if ((strcmp(fields[0], "Total") == 0) &&
549 (strcmp(fields[1], "kBytes:") == 0))
550 submit_derive("apache_bytes", "", 1024LL * atoll(fields[2]), st);
551 } else if (fields_num == 2) {
552 if (strcmp(fields[0], "Scoreboard:") == 0)
553 submit_scoreboard(fields[1], st);
554 else if ((strcmp(fields[0], "BusyServers:") == 0) /* Apache 1.* */
555 || (strcmp(fields[0], "BusyWorkers:") == 0) /* Apache 2.* */)
556 submit_gauge("apache_connections", NULL, atol(fields[1]), st);
557 else if ((strcmp(fields[0], "IdleServers:") == 0) /* Apache 1.x */
558 || (strcmp(fields[0], "IdleWorkers:") == 0) /* Apache 2.x */)
559 submit_gauge("apache_idle_workers", NULL, atol(fields[1]), st);
560 }
561 }
563 st->apache_buffer_fill = 0;
565 return (0);
566 } /* }}} int apache_read_host */
568 static int apache_init(void) /* {{{ */
569 {
570 /* Call this while collectd is still single-threaded to avoid
571 * initialization issues in libgcrypt. */
572 curl_global_init(CURL_GLOBAL_SSL);
573 return (0);
574 } /* }}} int apache_init */
576 void module_register(void) {
577 plugin_register_complex_config("apache", config);
578 plugin_register_init("apache", apache_init);
579 } /* void module_register */
581 /* vim: set sw=8 noet fdm=marker : */