1 /**
2 * RRDTool - src/rrd_client.c
3 * Copyright (C) 2008 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "rrd.h"
23 #include "rrd_client.h"
24 #include "rrd_tool.h"
26 #include <stdlib.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <assert.h>
30 #include <pthread.h>
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <sys/un.h>
34 #include <netdb.h>
36 #ifndef ENODATA
37 #define ENODATA ENOENT
38 #endif
40 struct rrdc_response_s
41 {
42 int status;
43 char *message;
44 char **lines;
45 size_t lines_num;
46 };
47 typedef struct rrdc_response_s rrdc_response_t;
49 static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
50 static int sd = -1;
51 static FILE *sh = NULL;
52 static char *sd_path = NULL; /* cache the path for sd */
54 /* One must hold `lock' when calling `close_connection'. */
55 static void close_connection (void) /* {{{ */
56 {
57 if (sh != NULL)
58 {
59 fclose (sh);
60 sh = NULL;
61 sd = -1;
62 }
63 else if (sd >= 0)
64 {
65 close (sd);
66 sd = -1;
67 }
69 if (sd_path != NULL)
70 free (sd_path);
71 sd_path = NULL;
72 } /* }}} void close_connection */
74 static int buffer_add_string (const char *str, /* {{{ */
75 char **buffer_ret, size_t *buffer_size_ret)
76 {
77 char *buffer;
78 size_t buffer_size;
79 size_t buffer_pos;
80 size_t i;
81 int status;
83 buffer = *buffer_ret;
84 buffer_size = *buffer_size_ret;
85 buffer_pos = 0;
87 i = 0;
88 status = -1;
89 while (buffer_pos < buffer_size)
90 {
91 if (str[i] == 0)
92 {
93 buffer[buffer_pos] = ' ';
94 buffer_pos++;
95 status = 0;
96 break;
97 }
98 else if ((str[i] == ' ') || (str[i] == '\\'))
99 {
100 if (buffer_pos >= (buffer_size - 1))
101 break;
102 buffer[buffer_pos] = '\\';
103 buffer_pos++;
104 buffer[buffer_pos] = str[i];
105 buffer_pos++;
106 }
107 else
108 {
109 buffer[buffer_pos] = str[i];
110 buffer_pos++;
111 }
112 i++;
113 } /* while (buffer_pos < buffer_size) */
115 if (status != 0)
116 return (-1);
118 *buffer_ret = buffer + buffer_pos;
119 *buffer_size_ret = buffer_size - buffer_pos;
121 return (0);
122 } /* }}} int buffer_add_string */
124 static int buffer_add_value (const char *value, /* {{{ */
125 char **buffer_ret, size_t *buffer_size_ret)
126 {
127 char temp[4096];
129 if (strncmp (value, "N:", 2) == 0)
130 snprintf (temp, sizeof (temp), "%lu:%s",
131 (unsigned long) time (NULL), value + 2);
132 else
133 strncpy (temp, value, sizeof (temp));
134 temp[sizeof (temp) - 1] = 0;
136 return (buffer_add_string (temp, buffer_ret, buffer_size_ret));
137 } /* }}} int buffer_add_value */
139 /* Remove trailing newline (NL) and carriage return (CR) characters. Similar to
140 * the Perl function `chomp'. Returns the number of characters that have been
141 * removed. */
142 static int chomp (char *str) /* {{{ */
143 {
144 size_t len;
145 int removed;
147 if (str == NULL)
148 return (-1);
150 len = strlen (str);
151 removed = 0;
152 while ((len > 0) && ((str[len - 1] == '\n') || (str[len - 1] == '\r')))
153 {
154 str[len - 1] = 0;
155 len--;
156 removed++;
157 }
159 return (removed);
160 } /* }}} int chomp */
162 static void response_free (rrdc_response_t *res) /* {{{ */
163 {
164 if (res == NULL)
165 return;
167 if (res->lines != NULL)
168 {
169 size_t i;
171 for (i = 0; i < res->lines_num; i++)
172 if (res->lines[i] != NULL)
173 free (res->lines[i]);
174 free (res->lines);
175 }
177 free (res);
178 } /* }}} void response_free */
180 static int response_read (rrdc_response_t **ret_response) /* {{{ */
181 {
182 rrdc_response_t *ret;
184 char buffer[4096];
185 char *buffer_ptr;
187 size_t i;
189 if (sh == NULL)
190 return (-1);
192 ret = (rrdc_response_t *) malloc (sizeof (rrdc_response_t));
193 if (ret == NULL)
194 return (-2);
195 memset (ret, 0, sizeof (*ret));
196 ret->lines = NULL;
197 ret->lines_num = 0;
199 buffer_ptr = fgets (buffer, sizeof (buffer), sh);
200 if (buffer_ptr == NULL)
201 return (-3);
202 chomp (buffer);
204 ret->status = strtol (buffer, &ret->message, 0);
205 if (buffer == ret->message)
206 {
207 response_free (ret);
208 return (-4);
209 }
210 /* Skip leading whitespace of the status message */
211 ret->message += strspn (ret->message, " \t");
213 if (ret->status <= 0)
214 {
215 *ret_response = ret;
216 return (0);
217 }
219 ret->lines = (char **) malloc (sizeof (char *) * ret->status);
220 if (ret->lines == NULL)
221 {
222 response_free (ret);
223 return (-5);
224 }
225 memset (ret->lines, 0, sizeof (char *) * ret->status);
226 ret->lines_num = (size_t) ret->status;
228 for (i = 0; i < ret->lines_num; i++)
229 {
230 buffer_ptr = fgets (buffer, sizeof (buffer), sh);
231 if (buffer_ptr == NULL)
232 {
233 response_free (ret);
234 return (-6);
235 }
236 chomp (buffer);
238 ret->lines[i] = strdup (buffer);
239 if (ret->lines[i] == NULL)
240 {
241 response_free (ret);
242 return (-7);
243 }
244 }
246 *ret_response = ret;
247 return (0);
248 } /* }}} rrdc_response_t *response_read */
250 static int request (const char *buffer, size_t buffer_size, /* {{{ */
251 rrdc_response_t **ret_response)
252 {
253 int status;
254 rrdc_response_t *res;
256 pthread_mutex_lock (&lock);
258 if (sh == NULL)
259 {
260 pthread_mutex_unlock (&lock);
261 return (ENOTCONN);
262 }
264 status = (int) fwrite (buffer, buffer_size, /* nmemb = */ 1, sh);
265 if (status != 1)
266 {
267 close_connection ();
268 pthread_mutex_unlock (&lock);
269 return (-1);
270 }
271 fflush (sh);
273 res = NULL;
274 status = response_read (&res);
276 pthread_mutex_unlock (&lock);
278 if (status != 0)
279 return (status);
281 *ret_response = res;
282 return (0);
283 } /* }}} int request */
285 /* determine whether we are connected to the specified daemon_addr if
286 * NULL, return whether we are connected at all
287 */
288 int rrdc_is_connected(const char *daemon_addr) /* {{{ */
289 {
290 if (sd < 0)
291 return 0;
292 else if (daemon_addr == NULL)
293 {
294 /* here we have to handle the case i.e.
295 * UPDATE --daemon ...; UPDATEV (no --daemon) ...
296 * In other words: we have a cached connection,
297 * but it is not specified in the current command.
298 * Daemon is only implied in this case if set in ENV
299 */
300 if (getenv(ENV_RRDCACHED_ADDRESS) != NULL)
301 return 1;
302 else
303 return 0;
304 }
305 else if (strcmp(daemon_addr, sd_path) == 0)
306 return 1;
307 else
308 return 0;
310 } /* }}} int rrdc_is_connected */
312 static int rrdc_connect_unix (const char *path) /* {{{ */
313 {
314 struct sockaddr_un sa;
315 int status;
317 assert (path != NULL);
318 assert (sd == -1);
320 sd = socket (PF_UNIX, SOCK_STREAM, /* protocol = */ 0);
321 if (sd < 0)
322 {
323 status = errno;
324 return (status);
325 }
327 memset (&sa, 0, sizeof (sa));
328 sa.sun_family = AF_UNIX;
329 strncpy (sa.sun_path, path, sizeof (sa.sun_path) - 1);
331 status = connect (sd, (struct sockaddr *) &sa, sizeof (sa));
332 if (status != 0)
333 {
334 status = errno;
335 close_connection ();
336 return (status);
337 }
339 sh = fdopen (sd, "r+");
340 if (sh == NULL)
341 {
342 status = errno;
343 close_connection ();
344 return (status);
345 }
347 return (0);
348 } /* }}} int rrdc_connect_unix */
350 static int rrdc_connect_network (const char *addr) /* {{{ */
351 {
352 struct addrinfo ai_hints;
353 struct addrinfo *ai_res;
354 struct addrinfo *ai_ptr;
356 assert (addr != NULL);
357 assert (sd == -1);
359 int status;
360 memset (&ai_hints, 0, sizeof (ai_hints));
361 ai_hints.ai_flags = 0;
362 #ifdef AI_ADDRCONFIG
363 ai_hints.ai_flags |= AI_ADDRCONFIG;
364 #endif
365 ai_hints.ai_family = AF_UNSPEC;
366 ai_hints.ai_socktype = SOCK_STREAM;
368 ai_res = NULL;
369 status = getaddrinfo (addr, RRDCACHED_DEFAULT_PORT, &ai_hints, &ai_res);
370 if (status != 0)
371 return (status);
373 for (ai_ptr = ai_res; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
374 {
375 sd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
376 if (sd < 0)
377 {
378 status = errno;
379 sd = -1;
380 continue;
381 }
383 status = connect (sd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
384 if (status != 0)
385 {
386 status = errno;
387 close_connection();
388 continue;
389 }
391 sh = fdopen (sd, "r+");
392 if (sh == NULL)
393 {
394 status = errno;
395 close_connection ();
396 continue;
397 }
399 assert (status == 0);
400 break;
401 } /* for (ai_ptr) */
403 return (status);
404 } /* }}} int rrdc_connect_network */
406 int rrdc_connect (const char *addr) /* {{{ */
407 {
408 int status = 0;
410 if (addr == NULL)
411 addr = getenv (ENV_RRDCACHED_ADDRESS);
413 if (addr == NULL)
414 return 0;
416 pthread_mutex_lock(&lock);
418 if (sd >= 0 && sd_path != NULL && strcmp(addr, sd_path) == 0)
419 {
420 /* connection to the same daemon; use cached connection */
421 pthread_mutex_unlock (&lock);
422 return (0);
423 }
424 else
425 {
426 close_connection();
427 }
429 if (strncmp ("unix:", addr, strlen ("unix:")) == 0)
430 status = rrdc_connect_unix (addr + strlen ("unix:"));
431 else if (addr[0] == '/')
432 status = rrdc_connect_unix (addr);
433 else
434 status = rrdc_connect_network(addr);
436 if (status == 0 && sd >= 0)
437 sd_path = strdup(addr);
438 else
439 rrd_set_error("Unable to connect to rrdcached: %s",
440 (status < 0)
441 ? "Internal error"
442 : rrd_strerror (status));
444 pthread_mutex_unlock (&lock);
445 return (status);
446 } /* }}} int rrdc_connect */
448 int rrdc_disconnect (void) /* {{{ */
449 {
450 pthread_mutex_lock (&lock);
452 close_connection();
454 pthread_mutex_unlock (&lock);
456 return (0);
457 } /* }}} int rrdc_disconnect */
459 int rrdc_update (const char *filename, int values_num, /* {{{ */
460 const char * const *values)
461 {
462 char buffer[4096];
463 char *buffer_ptr;
464 size_t buffer_free;
465 size_t buffer_size;
466 rrdc_response_t *res;
467 int status;
468 int i;
470 memset (buffer, 0, sizeof (buffer));
471 buffer_ptr = &buffer[0];
472 buffer_free = sizeof (buffer);
474 status = buffer_add_string ("update", &buffer_ptr, &buffer_free);
475 if (status != 0)
476 return (ENOBUFS);
478 status = buffer_add_string (filename, &buffer_ptr, &buffer_free);
479 if (status != 0)
480 return (ENOBUFS);
482 for (i = 0; i < values_num; i++)
483 {
484 status = buffer_add_value (values[i], &buffer_ptr, &buffer_free);
485 if (status != 0)
486 return (ENOBUFS);
487 }
489 assert (buffer_free < sizeof (buffer));
490 buffer_size = sizeof (buffer) - buffer_free;
491 assert (buffer[buffer_size - 1] == ' ');
492 buffer[buffer_size - 1] = '\n';
494 res = NULL;
495 status = request (buffer, buffer_size, &res);
496 if (status != 0)
497 return (status);
499 status = res->status;
500 response_free (res);
502 return (status);
503 } /* }}} int rrdc_update */
505 int rrdc_flush (const char *filename) /* {{{ */
506 {
507 char buffer[4096];
508 char *buffer_ptr;
509 size_t buffer_free;
510 size_t buffer_size;
511 rrdc_response_t *res;
512 int status;
514 if (filename == NULL)
515 return (-1);
517 memset (buffer, 0, sizeof (buffer));
518 buffer_ptr = &buffer[0];
519 buffer_free = sizeof (buffer);
521 status = buffer_add_string ("flush", &buffer_ptr, &buffer_free);
522 if (status != 0)
523 return (ENOBUFS);
525 status = buffer_add_string (filename, &buffer_ptr, &buffer_free);
526 if (status != 0)
527 return (ENOBUFS);
529 assert (buffer_free < sizeof (buffer));
530 buffer_size = sizeof (buffer) - buffer_free;
531 assert (buffer[buffer_size - 1] == ' ');
532 buffer[buffer_size - 1] = '\n';
534 res = NULL;
535 status = request (buffer, buffer_size, &res);
536 if (status != 0)
537 return (status);
539 status = res->status;
540 response_free (res);
542 return (status);
543 } /* }}} int rrdc_flush */
546 /* convenience function; if there is a daemon specified, or if we can
547 * detect one from the environment, then flush the file. Otherwise, no-op
548 */
549 int rrdc_flush_if_daemon (const char *opt_daemon, const char *filename) /* {{{ */
550 {
551 int status = 0;
553 rrdc_connect(opt_daemon);
555 if (rrdc_is_connected(opt_daemon))
556 {
557 status = rrdc_flush (filename);
558 if (status != 0)
559 {
560 rrd_set_error ("rrdc_flush (%s) failed with status %i.",
561 filename, status);
562 }
563 } /* if (daemon_addr) */
565 return status;
566 } /* }}} int rrdc_flush_if_daemon */
569 int rrdc_stats_get (rrdc_stats_t **ret_stats) /* {{{ */
570 {
571 rrdc_stats_t *head;
572 rrdc_stats_t *tail;
574 rrdc_response_t *res;
576 int status;
577 size_t i;
579 /* Protocol example: {{{
580 * -> STATS
581 * <- 5 Statistics follow
582 * <- QueueLength: 0
583 * <- UpdatesWritten: 0
584 * <- DataSetsWritten: 0
585 * <- TreeNodesNumber: 0
586 * <- TreeDepth: 0
587 * }}} */
589 res = NULL;
590 status = request ("STATS\n", strlen ("STATS\n"), &res);
591 if (status != 0)
592 return (status);
594 if (res->status <= 0)
595 {
596 response_free (res);
597 return (EIO);
598 }
600 head = NULL;
601 tail = NULL;
602 for (i = 0; i < res->lines_num; i++)
603 {
604 char *key;
605 char *value;
606 char *endptr;
607 rrdc_stats_t *s;
609 key = res->lines[i];
610 value = strchr (key, ':');
611 if (value == NULL)
612 continue;
613 *value = 0;
614 value++;
616 while ((value[0] == ' ') || (value[0] == '\t'))
617 value++;
619 s = (rrdc_stats_t *) malloc (sizeof (rrdc_stats_t));
620 if (s == NULL)
621 continue;
622 memset (s, 0, sizeof (*s));
624 s->name = strdup (key);
626 endptr = NULL;
627 if ((strcmp ("QueueLength", key) == 0)
628 || (strcmp ("TreeDepth", key) == 0)
629 || (strcmp ("TreeNodesNumber", key) == 0))
630 {
631 s->type = RRDC_STATS_TYPE_GAUGE;
632 s->value.gauge = strtod (value, &endptr);
633 }
634 else if ((strcmp ("DataSetsWritten", key) == 0)
635 || (strcmp ("FlushesReceived", key) == 0)
636 || (strcmp ("JournalBytes", key) == 0)
637 || (strcmp ("JournalRotate", key) == 0)
638 || (strcmp ("UpdatesReceived", key) == 0)
639 || (strcmp ("UpdatesWritten", key) == 0))
640 {
641 s->type = RRDC_STATS_TYPE_COUNTER;
642 s->value.counter = (uint64_t) strtoll (value, &endptr, /* base = */ 0);
643 }
644 else
645 {
646 free (s);
647 continue;
648 }
650 /* Conversion failed */
651 if (endptr == value)
652 {
653 free (s);
654 continue;
655 }
657 if (head == NULL)
658 {
659 head = s;
660 tail = s;
661 s->next = NULL;
662 }
663 else
664 {
665 tail->next = s;
666 tail = s;
667 }
668 } /* for (i = 0; i < res->lines_num; i++) */
670 response_free (res);
672 if (head == NULL)
673 return (EPROTO);
675 *ret_stats = head;
676 return (0);
677 } /* }}} int rrdc_stats_get */
679 void rrdc_stats_free (rrdc_stats_t *ret_stats) /* {{{ */
680 {
681 rrdc_stats_t *this;
683 this = ret_stats;
684 while (this != NULL)
685 {
686 rrdc_stats_t *next;
688 next = this->next;
690 if (this->name != NULL)
691 {
692 free (this->name);
693 this->name = NULL;
694 }
695 free (this);
697 this = next;
698 } /* while (this != NULL) */
699 } /* }}} void rrdc_stats_free */
701 /*
702 * vim: set sw=2 sts=2 ts=8 et fdm=marker :
703 */