1 /**
2 * RRDTool - src/rrd_daemon.c
3 * Copyright (C) 2008,2009 Florian octo Forster
4 * Copyright (C) 2008,2009 Kevin Brintnall
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 * Florian octo Forster <octo at verplant.org>
21 * kevin brintnall <kbrint@rufus.net>
22 **/
24 #if 0
25 /*
26 * First tell the compiler to stick to the C99 and POSIX standards as close as
27 * possible.
28 */
29 #ifndef __STRICT_ANSI__ /* {{{ */
30 # define __STRICT_ANSI__
31 #endif
33 #ifndef _ISOC99_SOURCE
34 # define _ISOC99_SOURCE
35 #endif
37 #ifdef _POSIX_C_SOURCE
38 # undef _POSIX_C_SOURCE
39 #endif
40 #define _POSIX_C_SOURCE 200112L
42 /* Single UNIX needed for strdup. */
43 #ifdef _XOPEN_SOURCE
44 # undef _XOPEN_SOURCE
45 #endif
46 #define _XOPEN_SOURCE 500
48 #ifndef _REENTRANT
49 # define _REENTRANT
50 #endif
52 #ifndef _THREAD_SAFE
53 # define _THREAD_SAFE
54 #endif
56 #ifdef _GNU_SOURCE
57 # undef _GNU_SOURCE
58 #endif
59 /* }}} */
60 #endif /* 0 */
62 /*
63 * Now for some includes..
64 */
65 /* {{{ */
66 #if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(HAVE_CONFIG_H)
67 #include "../win32/config.h"
68 #else
69 #ifdef HAVE_CONFIG_H
70 #include "../rrd_config.h"
71 #endif
72 #endif
74 #include "rrd.h"
75 #include "rrd_client.h"
77 #include <stdlib.h>
79 #ifndef WIN32
80 #ifdef HAVE_STDINT_H
81 # include <stdint.h>
82 #endif
83 #include <unistd.h>
84 #include <strings.h>
85 #include <inttypes.h>
86 #include <sys/socket.h>
88 #else
90 #endif
91 #include <stdio.h>
92 #include <string.h>
94 #include <sys/types.h>
95 #include <sys/stat.h>
96 #include <dirent.h>
97 #include <fcntl.h>
98 #include <signal.h>
99 #include <sys/un.h>
100 #include <netdb.h>
101 #include <poll.h>
102 #include <syslog.h>
103 #include <pthread.h>
104 #include <errno.h>
105 #include <assert.h>
106 #include <sys/time.h>
107 #include <time.h>
108 #include <libgen.h>
109 #include <grp.h>
111 #include <glib-2.0/glib.h>
112 /* }}} */
114 #define RRDD_LOG(severity, ...) \
115 do { \
116 if (stay_foreground) \
117 fprintf(stderr, __VA_ARGS__); \
118 syslog ((severity), __VA_ARGS__); \
119 } while (0)
121 #ifndef __GNUC__
122 # define __attribute__(x) /**/
123 #endif
125 /*
126 * Types
127 */
128 typedef enum { RESP_ERR = -1, RESP_OK = 0 } response_code;
130 struct listen_socket_s
131 {
132 int fd;
133 char addr[PATH_MAX + 1];
134 int family;
136 /* state for BATCH processing */
137 time_t batch_start;
138 int batch_cmd;
140 /* buffered IO */
141 char *rbuf;
142 off_t next_cmd;
143 off_t next_read;
145 char *wbuf;
146 ssize_t wbuf_len;
148 uint32_t permissions;
150 gid_t socket_group;
151 mode_t socket_permissions;
152 };
153 typedef struct listen_socket_s listen_socket_t;
155 struct command_s;
156 typedef struct command_s command_t;
157 /* note: guard against "unused" warnings in the handlers */
158 #define DISPATCH_PROTO listen_socket_t *sock __attribute__((unused)),\
159 time_t now __attribute__((unused)),\
160 char *buffer __attribute__((unused)),\
161 size_t buffer_size __attribute__((unused))
163 #define HANDLER_PROTO command_t *cmd __attribute__((unused)),\
164 DISPATCH_PROTO
166 struct command_s {
167 char *cmd;
168 int (*handler)(HANDLER_PROTO);
170 char context; /* where we expect to see it */
171 #define CMD_CONTEXT_CLIENT (1<<0)
172 #define CMD_CONTEXT_BATCH (1<<1)
173 #define CMD_CONTEXT_JOURNAL (1<<2)
174 #define CMD_CONTEXT_ANY (0x7f)
176 char *syntax;
177 char *help;
178 };
180 struct cache_item_s;
181 typedef struct cache_item_s cache_item_t;
182 struct cache_item_s
183 {
184 char *file;
185 char **values;
186 size_t values_num;
187 time_t last_flush_time;
188 time_t last_update_stamp;
189 #define CI_FLAGS_IN_TREE (1<<0)
190 #define CI_FLAGS_IN_QUEUE (1<<1)
191 int flags;
192 pthread_cond_t flushed;
193 cache_item_t *prev;
194 cache_item_t *next;
195 };
197 struct callback_flush_data_s
198 {
199 time_t now;
200 time_t abs_timeout;
201 char **keys;
202 size_t keys_num;
203 };
204 typedef struct callback_flush_data_s callback_flush_data_t;
206 enum queue_side_e
207 {
208 HEAD,
209 TAIL
210 };
211 typedef enum queue_side_e queue_side_t;
213 /* describe a set of journal files */
214 typedef struct {
215 char **files;
216 size_t files_num;
217 } journal_set;
219 /* max length of socket command or response */
220 #define CMD_MAX 4096
221 #define RBUF_SIZE (CMD_MAX*2)
223 /*
224 * Variables
225 */
226 static int stay_foreground = 0;
227 static uid_t daemon_uid;
229 static listen_socket_t *listen_fds = NULL;
230 static size_t listen_fds_num = 0;
232 enum {
233 RUNNING, /* normal operation */
234 FLUSHING, /* flushing remaining values */
235 SHUTDOWN /* shutting down */
236 } state = RUNNING;
238 static pthread_t *queue_threads;
239 static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
240 static int config_queue_threads = 4;
242 static pthread_t flush_thread;
243 static pthread_cond_t flush_cond = PTHREAD_COND_INITIALIZER;
245 static pthread_mutex_t connection_threads_lock = PTHREAD_MUTEX_INITIALIZER;
246 static pthread_cond_t connection_threads_done = PTHREAD_COND_INITIALIZER;
247 static int connection_threads_num = 0;
249 /* Cache stuff */
250 static GTree *cache_tree = NULL;
251 static cache_item_t *cache_queue_head = NULL;
252 static cache_item_t *cache_queue_tail = NULL;
253 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
255 static int config_write_interval = 300;
256 static int config_write_jitter = 0;
257 static int config_flush_interval = 3600;
258 static int config_flush_at_shutdown = 0;
259 static char *config_pid_file = NULL;
260 static char *config_base_dir = NULL;
261 static size_t _config_base_dir_len = 0;
262 static int config_write_base_only = 0;
264 static listen_socket_t **config_listen_address_list = NULL;
265 static size_t config_listen_address_list_len = 0;
267 static uint64_t stats_queue_length = 0;
268 static uint64_t stats_updates_received = 0;
269 static uint64_t stats_flush_received = 0;
270 static uint64_t stats_updates_written = 0;
271 static uint64_t stats_data_sets_written = 0;
272 static uint64_t stats_journal_bytes = 0;
273 static uint64_t stats_journal_rotate = 0;
274 static pthread_mutex_t stats_lock = PTHREAD_MUTEX_INITIALIZER;
276 /* Journaled updates */
277 #define JOURNAL_REPLAY(s) ((s) == NULL)
278 #define JOURNAL_BASE "rrd.journal"
279 static journal_set *journal_cur = NULL;
280 static journal_set *journal_old = NULL;
281 static char *journal_dir = NULL;
282 static FILE *journal_fh = NULL; /* current journal file handle */
283 static long journal_size = 0; /* current journal size */
284 #define JOURNAL_MAX (1 * 1024 * 1024 * 1024)
285 static pthread_mutex_t journal_lock = PTHREAD_MUTEX_INITIALIZER;
286 static int journal_write(char *cmd, char *args);
287 static void journal_done(void);
288 static void journal_rotate(void);
290 /* prototypes for forward refernces */
291 static int handle_request_help (HANDLER_PROTO);
293 /*
294 * Functions
295 */
296 static void sig_common (const char *sig) /* {{{ */
297 {
298 RRDD_LOG(LOG_NOTICE, "caught SIG%s", sig);
299 state = FLUSHING;
300 pthread_cond_broadcast(&flush_cond);
301 pthread_cond_broadcast(&queue_cond);
302 } /* }}} void sig_common */
304 static void sig_int_handler (int s __attribute__((unused))) /* {{{ */
305 {
306 sig_common("INT");
307 } /* }}} void sig_int_handler */
309 static void sig_term_handler (int s __attribute__((unused))) /* {{{ */
310 {
311 sig_common("TERM");
312 } /* }}} void sig_term_handler */
314 static void sig_usr1_handler (int s __attribute__((unused))) /* {{{ */
315 {
316 config_flush_at_shutdown = 1;
317 sig_common("USR1");
318 } /* }}} void sig_usr1_handler */
320 static void sig_usr2_handler (int s __attribute__((unused))) /* {{{ */
321 {
322 config_flush_at_shutdown = 0;
323 sig_common("USR2");
324 } /* }}} void sig_usr2_handler */
326 static void install_signal_handlers(void) /* {{{ */
327 {
328 /* These structures are static, because `sigaction' behaves weird if the are
329 * overwritten.. */
330 static struct sigaction sa_int;
331 static struct sigaction sa_term;
332 static struct sigaction sa_pipe;
333 static struct sigaction sa_usr1;
334 static struct sigaction sa_usr2;
336 /* Install signal handlers */
337 memset (&sa_int, 0, sizeof (sa_int));
338 sa_int.sa_handler = sig_int_handler;
339 sigaction (SIGINT, &sa_int, NULL);
341 memset (&sa_term, 0, sizeof (sa_term));
342 sa_term.sa_handler = sig_term_handler;
343 sigaction (SIGTERM, &sa_term, NULL);
345 memset (&sa_pipe, 0, sizeof (sa_pipe));
346 sa_pipe.sa_handler = SIG_IGN;
347 sigaction (SIGPIPE, &sa_pipe, NULL);
349 memset (&sa_pipe, 0, sizeof (sa_usr1));
350 sa_usr1.sa_handler = sig_usr1_handler;
351 sigaction (SIGUSR1, &sa_usr1, NULL);
353 memset (&sa_usr2, 0, sizeof (sa_usr2));
354 sa_usr2.sa_handler = sig_usr2_handler;
355 sigaction (SIGUSR2, &sa_usr2, NULL);
357 } /* }}} void install_signal_handlers */
359 static int open_pidfile(char *action, int oflag) /* {{{ */
360 {
361 int fd;
362 const char *file;
363 char *file_copy, *dir;
365 file = (config_pid_file != NULL)
366 ? config_pid_file
367 : LOCALSTATEDIR "/run/rrdcached.pid";
369 /* dirname may modify its argument */
370 file_copy = strdup(file);
371 if (file_copy == NULL)
372 {
373 fprintf(stderr, "rrdcached: strdup(): %s\n",
374 rrd_strerror(errno));
375 return -1;
376 }
378 dir = dirname(file_copy);
379 if (rrd_mkdir_p(dir, 0777) != 0)
380 {
381 fprintf(stderr, "Failed to create pidfile directory '%s': %s\n",
382 dir, rrd_strerror(errno));
383 return -1;
384 }
386 free(file_copy);
388 fd = open(file, oflag, S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH);
389 if (fd < 0)
390 fprintf(stderr, "rrdcached: can't %s pid file '%s' (%s)\n",
391 action, file, rrd_strerror(errno));
393 return(fd);
394 } /* }}} static int open_pidfile */
396 /* check existing pid file to see whether a daemon is running */
397 static int check_pidfile(void)
398 {
399 int pid_fd;
400 pid_t pid;
401 char pid_str[16];
403 pid_fd = open_pidfile("open", O_RDWR);
404 if (pid_fd < 0)
405 return pid_fd;
407 if (read(pid_fd, pid_str, sizeof(pid_str)) <= 0)
408 return -1;
410 pid = atoi(pid_str);
411 if (pid <= 0)
412 return -1;
414 /* another running process that we can signal COULD be
415 * a competing rrdcached */
416 if (pid != getpid() && kill(pid, 0) == 0)
417 {
418 fprintf(stderr,
419 "FATAL: Another rrdcached daemon is running?? (pid %d)\n", pid);
420 close(pid_fd);
421 return -1;
422 }
424 lseek(pid_fd, 0, SEEK_SET);
425 if (ftruncate(pid_fd, 0) == -1)
426 {
427 fprintf(stderr,
428 "FATAL: Faild to truncate stale PID file. (pid %d)\n", pid);
429 close(pid_fd);
430 return -1;
431 }
433 fprintf(stderr,
434 "rrdcached: removed stale PID file (no rrdcached on pid %d)\n"
435 "rrdcached: starting normally.\n", pid);
437 return pid_fd;
438 } /* }}} static int check_pidfile */
440 static int write_pidfile (int fd) /* {{{ */
441 {
442 pid_t pid;
443 FILE *fh;
445 pid = getpid ();
447 fh = fdopen (fd, "w");
448 if (fh == NULL)
449 {
450 RRDD_LOG (LOG_ERR, "write_pidfile: fdopen() failed.");
451 close(fd);
452 return (-1);
453 }
455 fprintf (fh, "%i\n", (int) pid);
456 fclose (fh);
458 return (0);
459 } /* }}} int write_pidfile */
461 static int remove_pidfile (void) /* {{{ */
462 {
463 char *file;
464 int status;
466 file = (config_pid_file != NULL)
467 ? config_pid_file
468 : LOCALSTATEDIR "/run/rrdcached.pid";
470 status = unlink (file);
471 if (status == 0)
472 return (0);
473 return (errno);
474 } /* }}} int remove_pidfile */
476 static char *next_cmd (listen_socket_t *sock, ssize_t *len) /* {{{ */
477 {
478 char *eol;
480 eol = memchr(sock->rbuf + sock->next_cmd, '\n',
481 sock->next_read - sock->next_cmd);
483 if (eol == NULL)
484 {
485 /* no commands left, move remainder back to front of rbuf */
486 memmove(sock->rbuf, sock->rbuf + sock->next_cmd,
487 sock->next_read - sock->next_cmd);
488 sock->next_read -= sock->next_cmd;
489 sock->next_cmd = 0;
490 *len = 0;
491 return NULL;
492 }
493 else
494 {
495 char *cmd = sock->rbuf + sock->next_cmd;
496 *eol = '\0';
498 sock->next_cmd = eol - sock->rbuf + 1;
500 if (eol > sock->rbuf && *(eol-1) == '\r')
501 *(--eol) = '\0'; /* handle "\r\n" EOL */
503 *len = eol - cmd;
505 return cmd;
506 }
508 /* NOTREACHED */
509 assert(1==0);
510 } /* }}} char *next_cmd */
512 /* add the characters directly to the write buffer */
513 static int add_to_wbuf(listen_socket_t *sock, char *str, size_t len) /* {{{ */
514 {
515 char *new_buf;
517 assert(sock != NULL);
519 new_buf = rrd_realloc(sock->wbuf, sock->wbuf_len + len + 1);
520 if (new_buf == NULL)
521 {
522 RRDD_LOG(LOG_ERR, "add_to_wbuf: realloc failed");
523 return -1;
524 }
526 strncpy(new_buf + sock->wbuf_len, str, len + 1);
528 sock->wbuf = new_buf;
529 sock->wbuf_len += len;
531 return 0;
532 } /* }}} static int add_to_wbuf */
534 /* add the text to the "extra" info that's sent after the status line */
535 static int add_response_info(listen_socket_t *sock, char *fmt, ...) /* {{{ */
536 {
537 va_list argp;
538 char buffer[CMD_MAX];
539 int len;
541 if (JOURNAL_REPLAY(sock)) return 0;
542 if (sock->batch_start) return 0; /* no extra info returned when in BATCH */
544 va_start(argp, fmt);
545 #ifdef HAVE_VSNPRINTF
546 len = vsnprintf(buffer, sizeof(buffer), fmt, argp);
547 #else
548 len = vsprintf(buffer, fmt, argp);
549 #endif
550 va_end(argp);
551 if (len < 0)
552 {
553 RRDD_LOG(LOG_ERR, "add_response_info: vnsprintf failed");
554 return -1;
555 }
557 return add_to_wbuf(sock, buffer, len);
558 } /* }}} static int add_response_info */
560 static int count_lines(char *str) /* {{{ */
561 {
562 int lines = 0;
564 if (str != NULL)
565 {
566 while ((str = strchr(str, '\n')) != NULL)
567 {
568 ++lines;
569 ++str;
570 }
571 }
573 return lines;
574 } /* }}} static int count_lines */
576 /* send the response back to the user.
577 * returns 0 on success, -1 on error
578 * write buffer is always zeroed after this call */
579 static int send_response (listen_socket_t *sock, response_code rc,
580 char *fmt, ...) /* {{{ */
581 {
582 va_list argp;
583 char buffer[CMD_MAX];
584 int lines;
585 ssize_t wrote;
586 int rclen, len;
588 if (JOURNAL_REPLAY(sock)) return rc;
590 if (sock->batch_start)
591 {
592 if (rc == RESP_OK)
593 return rc; /* no response on success during BATCH */
594 lines = sock->batch_cmd;
595 }
596 else if (rc == RESP_OK)
597 lines = count_lines(sock->wbuf);
598 else
599 lines = -1;
601 rclen = sprintf(buffer, "%d ", lines);
602 va_start(argp, fmt);
603 #ifdef HAVE_VSNPRINTF
604 len = vsnprintf(buffer+rclen, sizeof(buffer)-rclen, fmt, argp);
605 #else
606 len = vsprintf(buffer+rclen, fmt, argp);
607 #endif
608 va_end(argp);
609 if (len < 0)
610 return -1;
612 len += rclen;
614 /* append the result to the wbuf, don't write to the user */
615 if (sock->batch_start)
616 return add_to_wbuf(sock, buffer, len);
618 /* first write must be complete */
619 if (len != write(sock->fd, buffer, len))
620 {
621 RRDD_LOG(LOG_INFO, "send_response: could not write status message");
622 return -1;
623 }
625 if (sock->wbuf != NULL && rc == RESP_OK)
626 {
627 wrote = 0;
628 while (wrote < sock->wbuf_len)
629 {
630 ssize_t wb = write(sock->fd, sock->wbuf + wrote, sock->wbuf_len - wrote);
631 if (wb <= 0)
632 {
633 RRDD_LOG(LOG_INFO, "send_response: could not write results");
634 return -1;
635 }
636 wrote += wb;
637 }
638 }
640 free(sock->wbuf); sock->wbuf = NULL;
641 sock->wbuf_len = 0;
643 return 0;
644 } /* }}} */
646 static void wipe_ci_values(cache_item_t *ci, time_t when)
647 {
648 ci->values = NULL;
649 ci->values_num = 0;
651 ci->last_flush_time = when;
652 if (config_write_jitter > 0)
653 ci->last_flush_time += (rrd_random() % config_write_jitter);
654 }
656 /* remove_from_queue
657 * remove a "cache_item_t" item from the queue.
658 * must hold 'cache_lock' when calling this
659 */
660 static void remove_from_queue(cache_item_t *ci) /* {{{ */
661 {
662 if (ci == NULL) return;
663 if ((ci->flags & CI_FLAGS_IN_QUEUE) == 0) return; /* not queued */
665 if (ci->prev == NULL)
666 cache_queue_head = ci->next; /* reset head */
667 else
668 ci->prev->next = ci->next;
670 if (ci->next == NULL)
671 cache_queue_tail = ci->prev; /* reset the tail */
672 else
673 ci->next->prev = ci->prev;
675 ci->next = ci->prev = NULL;
676 ci->flags &= ~CI_FLAGS_IN_QUEUE;
678 pthread_mutex_lock (&stats_lock);
679 assert (stats_queue_length > 0);
680 stats_queue_length--;
681 pthread_mutex_unlock (&stats_lock);
683 } /* }}} static void remove_from_queue */
685 /* free the resources associated with the cache_item_t
686 * must hold cache_lock when calling this function
687 */
688 static void *free_cache_item(cache_item_t *ci) /* {{{ */
689 {
690 if (ci == NULL) return NULL;
692 remove_from_queue(ci);
694 for (size_t i=0; i < ci->values_num; i++)
695 free(ci->values[i]);
697 free (ci->values);
698 free (ci->file);
700 /* in case anyone is waiting */
701 pthread_cond_broadcast(&ci->flushed);
702 pthread_cond_destroy(&ci->flushed);
704 free (ci);
706 return NULL;
707 } /* }}} static void *free_cache_item */
709 /*
710 * enqueue_cache_item:
711 * `cache_lock' must be acquired before calling this function!
712 */
713 static int enqueue_cache_item (cache_item_t *ci, /* {{{ */
714 queue_side_t side)
715 {
716 if (ci == NULL)
717 return (-1);
719 if (ci->values_num == 0)
720 return (0);
722 if (side == HEAD)
723 {
724 if (cache_queue_head == ci)
725 return 0;
727 /* remove if further down in queue */
728 remove_from_queue(ci);
730 ci->prev = NULL;
731 ci->next = cache_queue_head;
732 if (ci->next != NULL)
733 ci->next->prev = ci;
734 cache_queue_head = ci;
736 if (cache_queue_tail == NULL)
737 cache_queue_tail = cache_queue_head;
738 }
739 else /* (side == TAIL) */
740 {
741 /* We don't move values back in the list.. */
742 if (ci->flags & CI_FLAGS_IN_QUEUE)
743 return (0);
745 assert (ci->next == NULL);
746 assert (ci->prev == NULL);
748 ci->prev = cache_queue_tail;
750 if (cache_queue_tail == NULL)
751 cache_queue_head = ci;
752 else
753 cache_queue_tail->next = ci;
755 cache_queue_tail = ci;
756 }
758 ci->flags |= CI_FLAGS_IN_QUEUE;
760 pthread_cond_signal(&queue_cond);
761 pthread_mutex_lock (&stats_lock);
762 stats_queue_length++;
763 pthread_mutex_unlock (&stats_lock);
765 return (0);
766 } /* }}} int enqueue_cache_item */
768 /*
769 * tree_callback_flush:
770 * Called via `g_tree_foreach' in `flush_thread_main'. `cache_lock' is held
771 * while this is in progress.
772 */
773 static gboolean tree_callback_flush (gpointer key, gpointer value, /* {{{ */
774 gpointer data)
775 {
776 cache_item_t *ci;
777 callback_flush_data_t *cfd;
779 ci = (cache_item_t *) value;
780 cfd = (callback_flush_data_t *) data;
782 if (ci->flags & CI_FLAGS_IN_QUEUE)
783 return FALSE;
785 if (ci->values_num > 0
786 && (ci->last_flush_time <= cfd->abs_timeout || state != RUNNING))
787 {
788 enqueue_cache_item (ci, TAIL);
789 }
790 else if (((cfd->now - ci->last_flush_time) >= config_flush_interval)
791 && (ci->values_num <= 0))
792 {
793 assert ((char *) key == ci->file);
794 if (!rrd_add_ptr((void ***)&cfd->keys, &cfd->keys_num, (void *)key))
795 {
796 RRDD_LOG (LOG_ERR, "tree_callback_flush: rrd_add_ptrs failed.");
797 return (FALSE);
798 }
799 }
801 return (FALSE);
802 } /* }}} gboolean tree_callback_flush */
804 static int flush_old_values (int max_age)
805 {
806 callback_flush_data_t cfd;
807 size_t k;
809 memset (&cfd, 0, sizeof (cfd));
810 /* Pass the current time as user data so that we don't need to call
811 * `time' for each node. */
812 cfd.now = time (NULL);
813 cfd.keys = NULL;
814 cfd.keys_num = 0;
816 if (max_age > 0)
817 cfd.abs_timeout = cfd.now - max_age;
818 else
819 cfd.abs_timeout = cfd.now + 2*config_write_jitter + 1;
821 /* `tree_callback_flush' will return the keys of all values that haven't
822 * been touched in the last `config_flush_interval' seconds in `cfd'.
823 * The char*'s in this array point to the same memory as ci->file, so we
824 * don't need to free them separately. */
825 g_tree_foreach (cache_tree, tree_callback_flush, (gpointer) &cfd);
827 for (k = 0; k < cfd.keys_num; k++)
828 {
829 gboolean status = g_tree_remove(cache_tree, cfd.keys[k]);
830 /* should never fail, since we have held the cache_lock
831 * the entire time */
832 assert(status == TRUE);
833 }
835 if (cfd.keys != NULL)
836 {
837 free (cfd.keys);
838 cfd.keys = NULL;
839 }
841 return (0);
842 } /* int flush_old_values */
844 static void *flush_thread_main (void *args __attribute__((unused))) /* {{{ */
845 {
846 struct timeval now;
847 struct timespec next_flush;
848 int status;
850 gettimeofday (&now, NULL);
851 next_flush.tv_sec = now.tv_sec + config_flush_interval;
852 next_flush.tv_nsec = 1000 * now.tv_usec;
854 pthread_mutex_lock(&cache_lock);
856 while (state == RUNNING)
857 {
858 gettimeofday (&now, NULL);
859 if ((now.tv_sec > next_flush.tv_sec)
860 || ((now.tv_sec == next_flush.tv_sec)
861 && ((1000 * now.tv_usec) > next_flush.tv_nsec)))
862 {
863 RRDD_LOG(LOG_DEBUG, "flushing old values");
865 /* Determine the time of the next cache flush. */
866 next_flush.tv_sec = now.tv_sec + config_flush_interval;
868 /* Flush all values that haven't been written in the last
869 * `config_write_interval' seconds. */
870 flush_old_values (config_write_interval);
872 /* unlock the cache while we rotate so we don't block incoming
873 * updates if the fsync() blocks on disk I/O */
874 pthread_mutex_unlock(&cache_lock);
875 journal_rotate();
876 pthread_mutex_lock(&cache_lock);
877 }
879 status = pthread_cond_timedwait(&flush_cond, &cache_lock, &next_flush);
880 if (status != 0 && status != ETIMEDOUT)
881 {
882 RRDD_LOG (LOG_ERR, "flush_thread_main: "
883 "pthread_cond_timedwait returned %i.", status);
884 }
885 }
887 if (config_flush_at_shutdown)
888 flush_old_values (-1); /* flush everything */
890 state = SHUTDOWN;
892 pthread_mutex_unlock(&cache_lock);
894 return NULL;
895 } /* void *flush_thread_main */
897 static void *queue_thread_main (void *args __attribute__((unused))) /* {{{ */
898 {
899 pthread_mutex_lock (&cache_lock);
901 while (state != SHUTDOWN
902 || (cache_queue_head != NULL && config_flush_at_shutdown))
903 {
904 cache_item_t *ci;
905 char *file;
906 char **values;
907 size_t values_num;
908 int status;
910 /* Now, check if there's something to store away. If not, wait until
911 * something comes in. */
912 if (cache_queue_head == NULL)
913 {
914 status = pthread_cond_wait (&queue_cond, &cache_lock);
915 if ((status != 0) && (status != ETIMEDOUT))
916 {
917 RRDD_LOG (LOG_ERR, "queue_thread_main: "
918 "pthread_cond_wait returned %i.", status);
919 }
920 }
922 /* Check if a value has arrived. This may be NULL if we timed out or there
923 * was an interrupt such as a signal. */
924 if (cache_queue_head == NULL)
925 continue;
927 ci = cache_queue_head;
929 /* copy the relevant parts */
930 file = strdup (ci->file);
931 if (file == NULL)
932 {
933 RRDD_LOG (LOG_ERR, "queue_thread_main: strdup failed.");
934 continue;
935 }
937 assert(ci->values != NULL);
938 assert(ci->values_num > 0);
940 values = ci->values;
941 values_num = ci->values_num;
943 wipe_ci_values(ci, time(NULL));
944 remove_from_queue(ci);
946 pthread_mutex_unlock (&cache_lock);
948 rrd_clear_error ();
949 status = rrd_update_r (file, NULL, (int) values_num, (void *) values);
950 if (status != 0)
951 {
952 RRDD_LOG (LOG_NOTICE, "queue_thread_main: "
953 "rrd_update_r (%s) failed with status %i. (%s)",
954 file, status, rrd_get_error());
955 }
957 journal_write("wrote", file);
959 /* Search again in the tree. It's possible someone issued a "FORGET"
960 * while we were writing the update values. */
961 pthread_mutex_lock(&cache_lock);
962 ci = (cache_item_t *) g_tree_lookup(cache_tree, file);
963 if (ci)
964 pthread_cond_broadcast(&ci->flushed);
965 pthread_mutex_unlock(&cache_lock);
967 if (status == 0)
968 {
969 pthread_mutex_lock (&stats_lock);
970 stats_updates_written++;
971 stats_data_sets_written += values_num;
972 pthread_mutex_unlock (&stats_lock);
973 }
975 rrd_free_ptrs((void ***) &values, &values_num);
976 free(file);
978 pthread_mutex_lock (&cache_lock);
979 }
980 pthread_mutex_unlock (&cache_lock);
982 return (NULL);
983 } /* }}} void *queue_thread_main */
985 static int buffer_get_field (char **buffer_ret, /* {{{ */
986 size_t *buffer_size_ret, char **field_ret)
987 {
988 char *buffer;
989 size_t buffer_pos;
990 size_t buffer_size;
991 char *field;
992 size_t field_size;
993 int status;
995 buffer = *buffer_ret;
996 buffer_pos = 0;
997 buffer_size = *buffer_size_ret;
998 field = *buffer_ret;
999 field_size = 0;
1001 if (buffer_size <= 0)
1002 return (-1);
1004 /* This is ensured by `handle_request'. */
1005 assert (buffer[buffer_size - 1] == '\0');
1007 status = -1;
1008 while (buffer_pos < buffer_size)
1009 {
1010 /* Check for end-of-field or end-of-buffer */
1011 if (buffer[buffer_pos] == ' ' || buffer[buffer_pos] == '\0')
1012 {
1013 field[field_size] = 0;
1014 field_size++;
1015 buffer_pos++;
1016 status = 0;
1017 break;
1018 }
1019 /* Handle escaped characters. */
1020 else if (buffer[buffer_pos] == '\\')
1021 {
1022 if (buffer_pos >= (buffer_size - 1))
1023 break;
1024 buffer_pos++;
1025 field[field_size] = buffer[buffer_pos];
1026 field_size++;
1027 buffer_pos++;
1028 }
1029 /* Normal operation */
1030 else
1031 {
1032 field[field_size] = buffer[buffer_pos];
1033 field_size++;
1034 buffer_pos++;
1035 }
1036 } /* while (buffer_pos < buffer_size) */
1038 if (status != 0)
1039 return (status);
1041 *buffer_ret = buffer + buffer_pos;
1042 *buffer_size_ret = buffer_size - buffer_pos;
1043 *field_ret = field;
1045 return (0);
1046 } /* }}} int buffer_get_field */
1048 /* if we're restricting writes to the base directory,
1049 * check whether the file falls within the dir
1050 * returns 1 if OK, otherwise 0
1051 */
1052 static int check_file_access (const char *file, listen_socket_t *sock) /* {{{ */
1053 {
1054 assert(file != NULL);
1056 if (!config_write_base_only
1057 || JOURNAL_REPLAY(sock)
1058 || config_base_dir == NULL)
1059 return 1;
1061 if (strstr(file, "../") != NULL) goto err;
1063 /* relative paths without "../" are ok */
1064 if (*file != '/') return 1;
1066 /* file must be of the format base + "/" + <1+ char filename> */
1067 if (strlen(file) < _config_base_dir_len + 2) goto err;
1068 if (strncmp(file, config_base_dir, _config_base_dir_len) != 0) goto err;
1069 if (*(file + _config_base_dir_len) != '/') goto err;
1071 return 1;
1073 err:
1074 if (sock != NULL && sock->fd >= 0)
1075 send_response(sock, RESP_ERR, "%s\n", rrd_strerror(EACCES));
1077 return 0;
1078 } /* }}} static int check_file_access */
1080 /* when using a base dir, convert relative paths to absolute paths.
1081 * if necessary, modifies the "filename" pointer to point
1082 * to the new path created in "tmp". "tmp" is provided
1083 * by the caller and sizeof(tmp) must be >= PATH_MAX.
1084 *
1085 * this allows us to optimize for the expected case (absolute path)
1086 * with a no-op.
1087 */
1088 static void get_abs_path(char **filename, char *tmp)
1089 {
1090 assert(tmp != NULL);
1091 assert(filename != NULL && *filename != NULL);
1093 if (config_base_dir == NULL || **filename == '/')
1094 return;
1096 snprintf(tmp, PATH_MAX, "%s/%s", config_base_dir, *filename);
1097 *filename = tmp;
1098 } /* }}} static int get_abs_path */
1100 static int flush_file (const char *filename) /* {{{ */
1101 {
1102 cache_item_t *ci;
1104 pthread_mutex_lock (&cache_lock);
1106 ci = (cache_item_t *) g_tree_lookup (cache_tree, filename);
1107 if (ci == NULL)
1108 {
1109 pthread_mutex_unlock (&cache_lock);
1110 return (ENOENT);
1111 }
1113 if (ci->values_num > 0)
1114 {
1115 /* Enqueue at head */
1116 enqueue_cache_item (ci, HEAD);
1117 pthread_cond_wait(&ci->flushed, &cache_lock);
1118 }
1120 /* DO NOT DO ANYTHING WITH ci HERE!! The entry
1121 * may have been purged during our cond_wait() */
1123 pthread_mutex_unlock(&cache_lock);
1125 return (0);
1126 } /* }}} int flush_file */
1128 static int syntax_error(listen_socket_t *sock, command_t *cmd) /* {{{ */
1129 {
1130 char *err = "Syntax error.\n";
1132 if (cmd && cmd->syntax)
1133 err = cmd->syntax;
1135 return send_response(sock, RESP_ERR, "Usage: %s", err);
1136 } /* }}} static int syntax_error() */
1138 static int handle_request_stats (HANDLER_PROTO) /* {{{ */
1139 {
1140 uint64_t copy_queue_length;
1141 uint64_t copy_updates_received;
1142 uint64_t copy_flush_received;
1143 uint64_t copy_updates_written;
1144 uint64_t copy_data_sets_written;
1145 uint64_t copy_journal_bytes;
1146 uint64_t copy_journal_rotate;
1148 uint64_t tree_nodes_number;
1149 uint64_t tree_depth;
1151 pthread_mutex_lock (&stats_lock);
1152 copy_queue_length = stats_queue_length;
1153 copy_updates_received = stats_updates_received;
1154 copy_flush_received = stats_flush_received;
1155 copy_updates_written = stats_updates_written;
1156 copy_data_sets_written = stats_data_sets_written;
1157 copy_journal_bytes = stats_journal_bytes;
1158 copy_journal_rotate = stats_journal_rotate;
1159 pthread_mutex_unlock (&stats_lock);
1161 pthread_mutex_lock (&cache_lock);
1162 tree_nodes_number = (uint64_t) g_tree_nnodes (cache_tree);
1163 tree_depth = (uint64_t) g_tree_height (cache_tree);
1164 pthread_mutex_unlock (&cache_lock);
1166 add_response_info(sock,
1167 "QueueLength: %"PRIu64"\n", copy_queue_length);
1168 add_response_info(sock,
1169 "UpdatesReceived: %"PRIu64"\n", copy_updates_received);
1170 add_response_info(sock,
1171 "FlushesReceived: %"PRIu64"\n", copy_flush_received);
1172 add_response_info(sock,
1173 "UpdatesWritten: %"PRIu64"\n", copy_updates_written);
1174 add_response_info(sock,
1175 "DataSetsWritten: %"PRIu64"\n", copy_data_sets_written);
1176 add_response_info(sock, "TreeNodesNumber: %"PRIu64"\n", tree_nodes_number);
1177 add_response_info(sock, "TreeDepth: %"PRIu64"\n", tree_depth);
1178 add_response_info(sock, "JournalBytes: %"PRIu64"\n", copy_journal_bytes);
1179 add_response_info(sock, "JournalRotate: %"PRIu64"\n", copy_journal_rotate);
1181 send_response(sock, RESP_OK, "Statistics follow\n");
1183 return (0);
1184 } /* }}} int handle_request_stats */
1186 static int handle_request_flush (HANDLER_PROTO) /* {{{ */
1187 {
1188 char *file, file_tmp[PATH_MAX];
1189 int status;
1191 status = buffer_get_field (&buffer, &buffer_size, &file);
1192 if (status != 0)
1193 {
1194 return syntax_error(sock,cmd);
1195 }
1196 else
1197 {
1198 pthread_mutex_lock(&stats_lock);
1199 stats_flush_received++;
1200 pthread_mutex_unlock(&stats_lock);
1202 get_abs_path(&file, file_tmp);
1203 if (!check_file_access(file, sock)) return 0;
1205 status = flush_file (file);
1206 if (status == 0)
1207 return send_response(sock, RESP_OK, "Successfully flushed %s.\n", file);
1208 else if (status == ENOENT)
1209 {
1210 /* no file in our tree; see whether it exists at all */
1211 struct stat statbuf;
1213 memset(&statbuf, 0, sizeof(statbuf));
1214 if (stat(file, &statbuf) == 0 && S_ISREG(statbuf.st_mode))
1215 return send_response(sock, RESP_OK, "Nothing to flush: %s.\n", file);
1216 else
1217 return send_response(sock, RESP_ERR, "No such file: %s.\n", file);
1218 }
1219 else if (status < 0)
1220 return send_response(sock, RESP_ERR, "Internal error.\n");
1221 else
1222 return send_response(sock, RESP_ERR, "Failed with status %i.\n", status);
1223 }
1225 /* NOTREACHED */
1226 assert(1==0);
1227 } /* }}} int handle_request_flush */
1229 static int handle_request_flushall(HANDLER_PROTO) /* {{{ */
1230 {
1231 RRDD_LOG(LOG_DEBUG, "Received FLUSHALL");
1233 pthread_mutex_lock(&cache_lock);
1234 flush_old_values(-1);
1235 pthread_mutex_unlock(&cache_lock);
1237 return send_response(sock, RESP_OK, "Started flush.\n");
1238 } /* }}} static int handle_request_flushall */
1240 static int handle_request_pending(HANDLER_PROTO) /* {{{ */
1241 {
1242 int status;
1243 char *file, file_tmp[PATH_MAX];
1244 cache_item_t *ci;
1246 status = buffer_get_field(&buffer, &buffer_size, &file);
1247 if (status != 0)
1248 return syntax_error(sock,cmd);
1250 get_abs_path(&file, file_tmp);
1252 pthread_mutex_lock(&cache_lock);
1253 ci = g_tree_lookup(cache_tree, file);
1254 if (ci == NULL)
1255 {
1256 pthread_mutex_unlock(&cache_lock);
1257 return send_response(sock, RESP_ERR, "%s\n", rrd_strerror(ENOENT));
1258 }
1260 for (size_t i=0; i < ci->values_num; i++)
1261 add_response_info(sock, "%s\n", ci->values[i]);
1263 pthread_mutex_unlock(&cache_lock);
1264 return send_response(sock, RESP_OK, "updates pending\n");
1265 } /* }}} static int handle_request_pending */
1267 static int handle_request_forget(HANDLER_PROTO) /* {{{ */
1268 {
1269 int status;
1270 gboolean found;
1271 char *file, file_tmp[PATH_MAX];
1273 status = buffer_get_field(&buffer, &buffer_size, &file);
1274 if (status != 0)
1275 return syntax_error(sock,cmd);
1277 get_abs_path(&file, file_tmp);
1278 if (!check_file_access(file, sock)) return 0;
1280 pthread_mutex_lock(&cache_lock);
1281 found = g_tree_remove(cache_tree, file);
1282 pthread_mutex_unlock(&cache_lock);
1284 if (found == TRUE)
1285 {
1286 if (!JOURNAL_REPLAY(sock))
1287 journal_write("forget", file);
1289 return send_response(sock, RESP_OK, "Gone!\n");
1290 }
1291 else
1292 return send_response(sock, RESP_ERR, "%s\n", rrd_strerror(ENOENT));
1294 /* NOTREACHED */
1295 assert(1==0);
1296 } /* }}} static int handle_request_forget */
1298 static int handle_request_queue (HANDLER_PROTO) /* {{{ */
1299 {
1300 cache_item_t *ci;
1302 pthread_mutex_lock(&cache_lock);
1304 ci = cache_queue_head;
1305 while (ci != NULL)
1306 {
1307 add_response_info(sock, "%d %s\n", ci->values_num, ci->file);
1308 ci = ci->next;
1309 }
1311 pthread_mutex_unlock(&cache_lock);
1313 return send_response(sock, RESP_OK, "in queue.\n");
1314 } /* }}} int handle_request_queue */
1316 static int handle_request_update (HANDLER_PROTO) /* {{{ */
1317 {
1318 char *file, file_tmp[PATH_MAX];
1319 int values_num = 0;
1320 int status;
1321 char orig_buf[CMD_MAX];
1323 cache_item_t *ci;
1325 /* save it for the journal later */
1326 if (!JOURNAL_REPLAY(sock))
1327 strncpy(orig_buf, buffer, buffer_size);
1329 status = buffer_get_field (&buffer, &buffer_size, &file);
1330 if (status != 0)
1331 return syntax_error(sock,cmd);
1333 pthread_mutex_lock(&stats_lock);
1334 stats_updates_received++;
1335 pthread_mutex_unlock(&stats_lock);
1337 get_abs_path(&file, file_tmp);
1338 if (!check_file_access(file, sock)) return 0;
1340 pthread_mutex_lock (&cache_lock);
1341 ci = g_tree_lookup (cache_tree, file);
1343 if (ci == NULL) /* {{{ */
1344 {
1345 struct stat statbuf;
1346 cache_item_t *tmp;
1348 /* don't hold the lock while we setup; stat(2) might block */
1349 pthread_mutex_unlock(&cache_lock);
1351 memset (&statbuf, 0, sizeof (statbuf));
1352 status = stat (file, &statbuf);
1353 if (status != 0)
1354 {
1355 RRDD_LOG (LOG_NOTICE, "handle_request_update: stat (%s) failed.", file);
1357 status = errno;
1358 if (status == ENOENT)
1359 return send_response(sock, RESP_ERR, "No such file: %s\n", file);
1360 else
1361 return send_response(sock, RESP_ERR,
1362 "stat failed with error %i.\n", status);
1363 }
1364 if (!S_ISREG (statbuf.st_mode))
1365 return send_response(sock, RESP_ERR, "Not a regular file: %s\n", file);
1367 if (access(file, R_OK|W_OK) != 0)
1368 return send_response(sock, RESP_ERR, "Cannot read/write %s: %s\n",
1369 file, rrd_strerror(errno));
1371 ci = (cache_item_t *) malloc (sizeof (cache_item_t));
1372 if (ci == NULL)
1373 {
1374 RRDD_LOG (LOG_ERR, "handle_request_update: malloc failed.");
1376 return send_response(sock, RESP_ERR, "malloc failed.\n");
1377 }
1378 memset (ci, 0, sizeof (cache_item_t));
1380 ci->file = strdup (file);
1381 if (ci->file == NULL)
1382 {
1383 free (ci);
1384 RRDD_LOG (LOG_ERR, "handle_request_update: strdup failed.");
1386 return send_response(sock, RESP_ERR, "strdup failed.\n");
1387 }
1389 wipe_ci_values(ci, now);
1390 ci->flags = CI_FLAGS_IN_TREE;
1391 pthread_cond_init(&ci->flushed, NULL);
1393 pthread_mutex_lock(&cache_lock);
1395 /* another UPDATE might have added this entry in the meantime */
1396 tmp = g_tree_lookup (cache_tree, file);
1397 if (tmp == NULL)
1398 g_tree_replace (cache_tree, (void *) ci->file, (void *) ci);
1399 else
1400 {
1401 free_cache_item (ci);
1402 ci = tmp;
1403 }
1405 /* state may have changed while we were unlocked */
1406 if (state == SHUTDOWN)
1407 return -1;
1408 } /* }}} */
1409 assert (ci != NULL);
1411 /* don't re-write updates in replay mode */
1412 if (!JOURNAL_REPLAY(sock))
1413 journal_write("update", orig_buf);
1415 while (buffer_size > 0)
1416 {
1417 char *value;
1418 time_t stamp;
1419 char *eostamp;
1421 status = buffer_get_field (&buffer, &buffer_size, &value);
1422 if (status != 0)
1423 {
1424 RRDD_LOG (LOG_INFO, "handle_request_update: Error reading field.");
1425 break;
1426 }
1428 /* make sure update time is always moving forward */
1429 stamp = strtol(value, &eostamp, 10);
1430 if (eostamp == value || eostamp == NULL || *eostamp != ':')
1431 {
1432 pthread_mutex_unlock(&cache_lock);
1433 return send_response(sock, RESP_ERR,
1434 "Cannot find timestamp in '%s'!\n", value);
1435 }
1436 else if (stamp <= ci->last_update_stamp)
1437 {
1438 pthread_mutex_unlock(&cache_lock);
1439 return send_response(sock, RESP_ERR,
1440 "illegal attempt to update using time %ld when last"
1441 " update time is %ld (minimum one second step)\n",
1442 stamp, ci->last_update_stamp);
1443 }
1444 else
1445 ci->last_update_stamp = stamp;
1447 if (!rrd_add_strdup(&ci->values, &ci->values_num, value))
1448 {
1449 RRDD_LOG (LOG_ERR, "handle_request_update: rrd_add_strdup failed.");
1450 continue;
1451 }
1453 values_num++;
1454 }
1456 if (((now - ci->last_flush_time) >= config_write_interval)
1457 && ((ci->flags & CI_FLAGS_IN_QUEUE) == 0)
1458 && (ci->values_num > 0))
1459 {
1460 enqueue_cache_item (ci, TAIL);
1461 }
1463 pthread_mutex_unlock (&cache_lock);
1465 if (values_num < 1)
1466 return send_response(sock, RESP_ERR, "No values updated.\n");
1467 else
1468 return send_response(sock, RESP_OK,
1469 "errors, enqueued %i value(s).\n", values_num);
1471 /* NOTREACHED */
1472 assert(1==0);
1474 } /* }}} int handle_request_update */
1476 /* we came across a "WROTE" entry during journal replay.
1477 * throw away any values that we have accumulated for this file
1478 */
1479 static int handle_request_wrote (HANDLER_PROTO) /* {{{ */
1480 {
1481 cache_item_t *ci;
1482 const char *file = buffer;
1484 pthread_mutex_lock(&cache_lock);
1486 ci = g_tree_lookup(cache_tree, file);
1487 if (ci == NULL)
1488 {
1489 pthread_mutex_unlock(&cache_lock);
1490 return (0);
1491 }
1493 if (ci->values)
1494 rrd_free_ptrs((void ***) &ci->values, &ci->values_num);
1496 wipe_ci_values(ci, now);
1497 remove_from_queue(ci);
1499 pthread_mutex_unlock(&cache_lock);
1500 return (0);
1501 } /* }}} int handle_request_wrote */
1503 /* start "BATCH" processing */
1504 static int batch_start (HANDLER_PROTO) /* {{{ */
1505 {
1506 int status;
1507 if (sock->batch_start)
1508 return send_response(sock, RESP_ERR, "Already in BATCH\n");
1510 status = send_response(sock, RESP_OK,
1511 "Go ahead. End with dot '.' on its own line.\n");
1512 sock->batch_start = time(NULL);
1513 sock->batch_cmd = 0;
1515 return status;
1516 } /* }}} static int batch_start */
1518 /* finish "BATCH" processing and return results to the client */
1519 static int batch_done (HANDLER_PROTO) /* {{{ */
1520 {
1521 assert(sock->batch_start);
1522 sock->batch_start = 0;
1523 sock->batch_cmd = 0;
1524 return send_response(sock, RESP_OK, "errors\n");
1525 } /* }}} static int batch_done */
1527 static int handle_request_quit (HANDLER_PROTO) /* {{{ */
1528 {
1529 return -1;
1530 } /* }}} static int handle_request_quit */
1532 static command_t list_of_commands[] = { /* {{{ */
1533 {
1534 "UPDATE",
1535 handle_request_update,
1536 CMD_CONTEXT_ANY,
1537 "UPDATE <filename> <values> [<values> ...]\n"
1538 ,
1539 "Adds the given file to the internal cache if it is not yet known and\n"
1540 "appends the given value(s) to the entry. See the rrdcached(1) manpage\n"
1541 "for details.\n"
1542 "\n"
1543 "Each <values> has the following form:\n"
1544 " <values> = <time>:<value>[:<value>[...]]\n"
1545 "See the rrdupdate(1) manpage for details.\n"
1546 },
1547 {
1548 "WROTE",
1549 handle_request_wrote,
1550 CMD_CONTEXT_JOURNAL,
1551 NULL,
1552 NULL
1553 },
1554 {
1555 "FLUSH",
1556 handle_request_flush,
1557 CMD_CONTEXT_CLIENT | CMD_CONTEXT_BATCH,
1558 "FLUSH <filename>\n"
1559 ,
1560 "Adds the given filename to the head of the update queue and returns\n"
1561 "after it has been dequeued.\n"
1562 },
1563 {
1564 "FLUSHALL",
1565 handle_request_flushall,
1566 CMD_CONTEXT_CLIENT,
1567 "FLUSHALL\n"
1568 ,
1569 "Triggers writing of all pending updates. Returns immediately.\n"
1570 },
1571 {
1572 "PENDING",
1573 handle_request_pending,
1574 CMD_CONTEXT_CLIENT,
1575 "PENDING <filename>\n"
1576 ,
1577 "Shows any 'pending' updates for a file, in order.\n"
1578 "The updates shown have not yet been written to the underlying RRD file.\n"
1579 },
1580 {
1581 "FORGET",
1582 handle_request_forget,
1583 CMD_CONTEXT_ANY,
1584 "FORGET <filename>\n"
1585 ,
1586 "Removes the file completely from the cache.\n"
1587 "Any pending updates for the file will be lost.\n"
1588 },
1589 {
1590 "QUEUE",
1591 handle_request_queue,
1592 CMD_CONTEXT_CLIENT,
1593 "QUEUE\n"
1594 ,
1595 "Shows all files in the output queue.\n"
1596 "The output is zero or more lines in the following format:\n"
1597 "(where <num_vals> is the number of values to be written)\n"
1598 "\n"
1599 "<num_vals> <filename>\n"
1600 },
1601 {
1602 "STATS",
1603 handle_request_stats,
1604 CMD_CONTEXT_CLIENT,
1605 "STATS\n"
1606 ,
1607 "Returns some performance counters, see the rrdcached(1) manpage for\n"
1608 "a description of the values.\n"
1609 },
1610 {
1611 "HELP",
1612 handle_request_help,
1613 CMD_CONTEXT_CLIENT,
1614 "HELP [<command>]\n",
1615 NULL, /* special! */
1616 },
1617 {
1618 "BATCH",
1619 batch_start,
1620 CMD_CONTEXT_CLIENT,
1621 "BATCH\n"
1622 ,
1623 "The 'BATCH' command permits the client to initiate a bulk load\n"
1624 " of commands to rrdcached.\n"
1625 "\n"
1626 "Usage:\n"
1627 "\n"
1628 " client: BATCH\n"
1629 " server: 0 Go ahead. End with dot '.' on its own line.\n"
1630 " client: command #1\n"
1631 " client: command #2\n"
1632 " client: ... and so on\n"
1633 " client: .\n"
1634 " server: 2 errors\n"
1635 " server: 7 message for command #7\n"
1636 " server: 9 message for command #9\n"
1637 "\n"
1638 "For more information, consult the rrdcached(1) documentation.\n"
1639 },
1640 {
1641 ".", /* BATCH terminator */
1642 batch_done,
1643 CMD_CONTEXT_BATCH,
1644 NULL,
1645 NULL
1646 },
1647 {
1648 "QUIT",
1649 handle_request_quit,
1650 CMD_CONTEXT_CLIENT | CMD_CONTEXT_BATCH,
1651 "QUIT\n"
1652 ,
1653 "Disconnect from rrdcached.\n"
1654 }
1655 }; /* }}} command_t list_of_commands[] */
1656 static size_t list_of_commands_len = sizeof (list_of_commands)
1657 / sizeof (list_of_commands[0]);
1659 static command_t *find_command(char *cmd)
1660 {
1661 size_t i;
1663 for (i = 0; i < list_of_commands_len; i++)
1664 if (strcasecmp(cmd, list_of_commands[i].cmd) == 0)
1665 return (&list_of_commands[i]);
1666 return NULL;
1667 }
1669 /* We currently use the index in the `list_of_commands' array as a bit position
1670 * in `listen_socket_t.permissions'. This member schould NEVER be accessed from
1671 * outside these functions so that switching to a more elegant storage method
1672 * is easily possible. */
1673 static ssize_t find_command_index (const char *cmd) /* {{{ */
1674 {
1675 size_t i;
1677 for (i = 0; i < list_of_commands_len; i++)
1678 if (strcasecmp(cmd, list_of_commands[i].cmd) == 0)
1679 return ((ssize_t) i);
1680 return (-1);
1681 } /* }}} ssize_t find_command_index */
1683 static int socket_permission_check (listen_socket_t *sock, /* {{{ */
1684 const char *cmd)
1685 {
1686 ssize_t i;
1688 if (JOURNAL_REPLAY(sock))
1689 return (1);
1691 if (cmd == NULL)
1692 return (-1);
1694 if ((strcasecmp ("QUIT", cmd) == 0)
1695 || (strcasecmp ("HELP", cmd) == 0))
1696 return (1);
1697 else if (strcmp (".", cmd) == 0)
1698 cmd = "BATCH";
1700 i = find_command_index (cmd);
1701 if (i < 0)
1702 return (-1);
1703 assert (i < 32);
1705 if ((sock->permissions & (1 << i)) != 0)
1706 return (1);
1707 return (0);
1708 } /* }}} int socket_permission_check */
1710 static int socket_permission_add (listen_socket_t *sock, /* {{{ */
1711 const char *cmd)
1712 {
1713 ssize_t i;
1715 i = find_command_index (cmd);
1716 if (i < 0)
1717 return (-1);
1718 assert (i < 32);
1720 sock->permissions |= (1 << i);
1721 return (0);
1722 } /* }}} int socket_permission_add */
1724 /* check whether commands are received in the expected context */
1725 static int command_check_context(listen_socket_t *sock, command_t *cmd)
1726 {
1727 if (JOURNAL_REPLAY(sock))
1728 return (cmd->context & CMD_CONTEXT_JOURNAL);
1729 else if (sock->batch_start)
1730 return (cmd->context & CMD_CONTEXT_BATCH);
1731 else
1732 return (cmd->context & CMD_CONTEXT_CLIENT);
1734 /* NOTREACHED */
1735 assert(1==0);
1736 }
1738 static int handle_request_help (HANDLER_PROTO) /* {{{ */
1739 {
1740 int status;
1741 char *cmd_str;
1742 char *resp_txt;
1743 command_t *help = NULL;
1745 status = buffer_get_field (&buffer, &buffer_size, &cmd_str);
1746 if (status == 0)
1747 help = find_command(cmd_str);
1749 if (help && (help->syntax || help->help))
1750 {
1751 char tmp[CMD_MAX];
1753 snprintf(tmp, sizeof(tmp)-1, "Help for %s\n", help->cmd);
1754 resp_txt = tmp;
1756 if (help->syntax)
1757 add_response_info(sock, "Usage: %s\n", help->syntax);
1759 if (help->help)
1760 add_response_info(sock, "%s\n", help->help);
1761 }
1762 else
1763 {
1764 size_t i;
1766 resp_txt = "Command overview\n";
1768 for (i = 0; i < list_of_commands_len; i++)
1769 {
1770 if (list_of_commands[i].syntax == NULL)
1771 continue;
1772 add_response_info (sock, "%s", list_of_commands[i].syntax);
1773 }
1774 }
1776 return send_response(sock, RESP_OK, resp_txt);
1777 } /* }}} int handle_request_help */
1779 static int handle_request (DISPATCH_PROTO) /* {{{ */
1780 {
1781 char *buffer_ptr = buffer;
1782 char *cmd_str = NULL;
1783 command_t *cmd = NULL;
1784 int status;
1786 assert (buffer[buffer_size - 1] == '\0');
1788 status = buffer_get_field (&buffer_ptr, &buffer_size, &cmd_str);
1789 if (status != 0)
1790 {
1791 RRDD_LOG (LOG_INFO, "handle_request: Unable parse command.");
1792 return (-1);
1793 }
1795 if (sock != NULL && sock->batch_start)
1796 sock->batch_cmd++;
1798 cmd = find_command(cmd_str);
1799 if (!cmd)
1800 return send_response(sock, RESP_ERR, "Unknown command: %s\n", cmd_str);
1802 if (!socket_permission_check (sock, cmd->cmd))
1803 return send_response(sock, RESP_ERR, "Permission denied.\n");
1805 if (!command_check_context(sock, cmd))
1806 return send_response(sock, RESP_ERR, "Can't use '%s' here.\n", cmd_str);
1808 return cmd->handler(cmd, sock, now, buffer_ptr, buffer_size);
1809 } /* }}} int handle_request */
1811 static void journal_set_free (journal_set *js) /* {{{ */
1812 {
1813 if (js == NULL)
1814 return;
1816 rrd_free_ptrs((void ***) &js->files, &js->files_num);
1818 free(js);
1819 } /* }}} journal_set_free */
1821 static void journal_set_remove (journal_set *js) /* {{{ */
1822 {
1823 if (js == NULL)
1824 return;
1826 for (uint i=0; i < js->files_num; i++)
1827 {
1828 RRDD_LOG(LOG_DEBUG, "removing old journal %s", js->files[i]);
1829 unlink(js->files[i]);
1830 }
1831 } /* }}} journal_set_remove */
1833 /* close current journal file handle.
1834 * MUST hold journal_lock before calling */
1835 static void journal_close(void) /* {{{ */
1836 {
1837 if (journal_fh != NULL)
1838 {
1839 if (fclose(journal_fh) != 0)
1840 RRDD_LOG(LOG_ERR, "cannot close journal: %s", rrd_strerror(errno));
1841 }
1843 journal_fh = NULL;
1844 journal_size = 0;
1845 } /* }}} journal_close */
1847 /* MUST hold journal_lock before calling */
1848 static void journal_new_file(void) /* {{{ */
1849 {
1850 struct timeval now;
1851 int new_fd;
1852 char new_file[PATH_MAX + 1];
1854 assert(journal_dir != NULL);
1855 assert(journal_cur != NULL);
1857 journal_close();
1859 gettimeofday(&now, NULL);
1860 /* this format assures that the files sort in strcmp() order */
1861 snprintf(new_file, PATH_MAX, "%s/%s.%010d.%06d",
1862 journal_dir, JOURNAL_BASE, (int)now.tv_sec, (int)now.tv_usec);
1864 new_fd = open(new_file, O_WRONLY|O_CREAT|O_APPEND,
1865 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
1866 if (new_fd < 0)
1867 goto error;
1869 journal_fh = fdopen(new_fd, "a");
1870 if (journal_fh == NULL)
1871 goto error;
1873 journal_size = ftell(journal_fh);
1874 RRDD_LOG(LOG_DEBUG, "started new journal %s", new_file);
1876 /* record the file in the journal set */
1877 rrd_add_strdup(&journal_cur->files, &journal_cur->files_num, new_file);
1879 return;
1881 error:
1882 RRDD_LOG(LOG_CRIT,
1883 "JOURNALING DISABLED: Error while trying to create %s : %s",
1884 new_file, rrd_strerror(errno));
1885 RRDD_LOG(LOG_CRIT,
1886 "JOURNALING DISABLED: All values will be flushed at shutdown");
1888 close(new_fd);
1889 config_flush_at_shutdown = 1;
1891 } /* }}} journal_new_file */
1893 /* MUST NOT hold journal_lock before calling this */
1894 static void journal_rotate(void) /* {{{ */
1895 {
1896 journal_set *old_js = NULL;
1898 if (journal_dir == NULL)
1899 return;
1901 RRDD_LOG(LOG_DEBUG, "rotating journals");
1903 pthread_mutex_lock(&stats_lock);
1904 ++stats_journal_rotate;
1905 pthread_mutex_unlock(&stats_lock);
1907 pthread_mutex_lock(&journal_lock);
1909 journal_close();
1911 /* rotate the journal sets */
1912 old_js = journal_old;
1913 journal_old = journal_cur;
1914 journal_cur = calloc(1, sizeof(journal_set));
1916 if (journal_cur != NULL)
1917 journal_new_file();
1918 else
1919 RRDD_LOG(LOG_CRIT, "journal_rotate: malloc(journal_set) failed\n");
1921 pthread_mutex_unlock(&journal_lock);
1923 journal_set_remove(old_js);
1924 journal_set_free (old_js);
1926 } /* }}} static void journal_rotate */
1928 /* MUST hold journal_lock when calling */
1929 static void journal_done(void) /* {{{ */
1930 {
1931 if (journal_cur == NULL)
1932 return;
1934 journal_close();
1936 if (config_flush_at_shutdown)
1937 {
1938 RRDD_LOG(LOG_INFO, "removing journals");
1939 journal_set_remove(journal_old);
1940 journal_set_remove(journal_cur);
1941 }
1942 else
1943 {
1944 RRDD_LOG(LOG_INFO, "expedited shutdown; "
1945 "journals will be used at next startup");
1946 }
1948 journal_set_free(journal_cur);
1949 journal_set_free(journal_old);
1950 free(journal_dir);
1952 } /* }}} static void journal_done */
1954 static int journal_write(char *cmd, char *args) /* {{{ */
1955 {
1956 int chars;
1958 if (journal_fh == NULL)
1959 return 0;
1961 pthread_mutex_lock(&journal_lock);
1962 chars = fprintf(journal_fh, "%s %s\n", cmd, args);
1963 journal_size += chars;
1965 if (journal_size > JOURNAL_MAX)
1966 journal_new_file();
1968 pthread_mutex_unlock(&journal_lock);
1970 if (chars > 0)
1971 {
1972 pthread_mutex_lock(&stats_lock);
1973 stats_journal_bytes += chars;
1974 pthread_mutex_unlock(&stats_lock);
1975 }
1977 return chars;
1978 } /* }}} static int journal_write */
1980 static int journal_replay (const char *file) /* {{{ */
1981 {
1982 FILE *fh;
1983 int entry_cnt = 0;
1984 int fail_cnt = 0;
1985 uint64_t line = 0;
1986 char entry[CMD_MAX];
1987 time_t now;
1989 if (file == NULL) return 0;
1991 {
1992 char *reason = "unknown error";
1993 int status = 0;
1994 struct stat statbuf;
1996 memset(&statbuf, 0, sizeof(statbuf));
1997 if (stat(file, &statbuf) != 0)
1998 {
1999 reason = "stat error";
2000 status = errno;
2001 }
2002 else if (!S_ISREG(statbuf.st_mode))
2003 {
2004 reason = "not a regular file";
2005 status = EPERM;
2006 }
2007 if (statbuf.st_uid != daemon_uid)
2008 {
2009 reason = "not owned by daemon user";
2010 status = EACCES;
2011 }
2012 if (statbuf.st_mode & (S_IWGRP|S_IWOTH))
2013 {
2014 reason = "must not be user/group writable";
2015 status = EACCES;
2016 }
2018 if (status != 0)
2019 {
2020 RRDD_LOG(LOG_ERR, "journal_replay: %s : %s (%s)",
2021 file, rrd_strerror(status), reason);
2022 return 0;
2023 }
2024 }
2026 fh = fopen(file, "r");
2027 if (fh == NULL)
2028 {
2029 if (errno != ENOENT)
2030 RRDD_LOG(LOG_ERR, "journal_replay: cannot open journal file: '%s' (%s)",
2031 file, rrd_strerror(errno));
2032 return 0;
2033 }
2034 else
2035 RRDD_LOG(LOG_NOTICE, "replaying from journal: %s", file);
2037 now = time(NULL);
2039 while(!feof(fh))
2040 {
2041 size_t entry_len;
2043 ++line;
2044 if (fgets(entry, sizeof(entry), fh) == NULL)
2045 break;
2046 entry_len = strlen(entry);
2048 /* check \n termination in case journal writing crashed mid-line */
2049 if (entry_len == 0)
2050 continue;
2051 else if (entry[entry_len - 1] != '\n')
2052 {
2053 RRDD_LOG(LOG_NOTICE, "Malformed journal entry at line %"PRIu64, line);
2054 ++fail_cnt;
2055 continue;
2056 }
2058 entry[entry_len - 1] = '\0';
2060 if (handle_request(NULL, now, entry, entry_len) == 0)
2061 ++entry_cnt;
2062 else
2063 ++fail_cnt;
2064 }
2066 fclose(fh);
2068 RRDD_LOG(LOG_INFO, "Replayed %d entries (%d failures)",
2069 entry_cnt, fail_cnt);
2071 return entry_cnt > 0 ? 1 : 0;
2072 } /* }}} static int journal_replay */
2074 static int journal_sort(const void *v1, const void *v2)
2075 {
2076 char **jn1 = (char **) v1;
2077 char **jn2 = (char **) v2;
2079 return strcmp(*jn1,*jn2);
2080 }
2082 static void journal_init(void) /* {{{ */
2083 {
2084 int had_journal = 0;
2085 DIR *dir;
2086 struct dirent *dent;
2087 char path[PATH_MAX+1];
2089 if (journal_dir == NULL) return;
2091 pthread_mutex_lock(&journal_lock);
2093 journal_cur = calloc(1, sizeof(journal_set));
2094 if (journal_cur == NULL)
2095 {
2096 RRDD_LOG(LOG_CRIT, "journal_rotate: malloc(journal_set) failed\n");
2097 return;
2098 }
2100 RRDD_LOG(LOG_INFO, "checking for journal files");
2102 /* Handle old journal files during transition. This gives them the
2103 * correct sort order. TODO: remove after first release
2104 */
2105 {
2106 char old_path[PATH_MAX+1];
2107 snprintf(old_path, PATH_MAX, "%s/%s", journal_dir, JOURNAL_BASE ".old" );
2108 snprintf(path, PATH_MAX, "%s/%s", journal_dir, JOURNAL_BASE ".0000");
2109 rename(old_path, path);
2111 snprintf(old_path, PATH_MAX, "%s/%s", journal_dir, JOURNAL_BASE );
2112 snprintf(path, PATH_MAX, "%s/%s", journal_dir, JOURNAL_BASE ".0001");
2113 rename(old_path, path);
2114 }
2116 dir = opendir(journal_dir);
2117 while ((dent = readdir(dir)) != NULL)
2118 {
2119 /* looks like a journal file? */
2120 if (strncmp(dent->d_name, JOURNAL_BASE, strlen(JOURNAL_BASE)))
2121 continue;
2123 snprintf(path, PATH_MAX, "%s/%s", journal_dir, dent->d_name);
2125 if (!rrd_add_strdup(&journal_cur->files, &journal_cur->files_num, path))
2126 {
2127 RRDD_LOG(LOG_CRIT, "journal_init: cannot add journal file %s!",
2128 dent->d_name);
2129 break;
2130 }
2131 }
2132 closedir(dir);
2134 qsort(journal_cur->files, journal_cur->files_num,
2135 sizeof(journal_cur->files[0]), journal_sort);
2137 for (uint i=0; i < journal_cur->files_num; i++)
2138 had_journal += journal_replay(journal_cur->files[i]);
2140 journal_new_file();
2142 /* it must have been a crash. start a flush */
2143 if (had_journal && config_flush_at_shutdown)
2144 flush_old_values(-1);
2146 pthread_mutex_unlock(&journal_lock);
2148 RRDD_LOG(LOG_INFO, "journal processing complete");
2150 } /* }}} static void journal_init */
2152 static void free_listen_socket(listen_socket_t *sock) /* {{{ */
2153 {
2154 assert(sock != NULL);
2156 free(sock->rbuf); sock->rbuf = NULL;
2157 free(sock->wbuf); sock->wbuf = NULL;
2158 free(sock);
2159 } /* }}} void free_listen_socket */
2161 static void close_connection(listen_socket_t *sock) /* {{{ */
2162 {
2163 if (sock->fd >= 0)
2164 {
2165 close(sock->fd);
2166 sock->fd = -1;
2167 }
2169 free_listen_socket(sock);
2171 } /* }}} void close_connection */
2173 static void *connection_thread_main (void *args) /* {{{ */
2174 {
2175 listen_socket_t *sock;
2176 int fd;
2178 sock = (listen_socket_t *) args;
2179 fd = sock->fd;
2181 /* init read buffers */
2182 sock->next_read = sock->next_cmd = 0;
2183 sock->rbuf = malloc(RBUF_SIZE);
2184 if (sock->rbuf == NULL)
2185 {
2186 RRDD_LOG(LOG_ERR, "connection_thread_main: cannot malloc read buffer");
2187 close_connection(sock);
2188 return NULL;
2189 }
2191 pthread_mutex_lock (&connection_threads_lock);
2192 connection_threads_num++;
2193 pthread_mutex_unlock (&connection_threads_lock);
2195 while (state == RUNNING)
2196 {
2197 char *cmd;
2198 ssize_t cmd_len;
2199 ssize_t rbytes;
2200 time_t now;
2202 struct pollfd pollfd;
2203 int status;
2205 pollfd.fd = fd;
2206 pollfd.events = POLLIN | POLLPRI;
2207 pollfd.revents = 0;
2209 status = poll (&pollfd, 1, /* timeout = */ 500);
2210 if (state != RUNNING)
2211 break;
2212 else if (status == 0) /* timeout */
2213 continue;
2214 else if (status < 0) /* error */
2215 {
2216 status = errno;
2217 if (status != EINTR)
2218 RRDD_LOG (LOG_ERR, "connection_thread_main: poll(2) failed.");
2219 continue;
2220 }
2222 if ((pollfd.revents & POLLHUP) != 0) /* normal shutdown */
2223 break;
2224 else if ((pollfd.revents & (POLLIN | POLLPRI)) == 0)
2225 {
2226 RRDD_LOG (LOG_WARNING, "connection_thread_main: "
2227 "poll(2) returned something unexpected: %#04hx",
2228 pollfd.revents);
2229 break;
2230 }
2232 rbytes = read(fd, sock->rbuf + sock->next_read,
2233 RBUF_SIZE - sock->next_read);
2234 if (rbytes < 0)
2235 {
2236 RRDD_LOG(LOG_ERR, "connection_thread_main: read() failed.");
2237 break;
2238 }
2239 else if (rbytes == 0)
2240 break; /* eof */
2242 sock->next_read += rbytes;
2244 if (sock->batch_start)
2245 now = sock->batch_start;
2246 else
2247 now = time(NULL);
2249 while ((cmd = next_cmd(sock, &cmd_len)) != NULL)
2250 {
2251 status = handle_request (sock, now, cmd, cmd_len+1);
2252 if (status != 0)
2253 goto out_close;
2254 }
2255 }
2257 out_close:
2258 close_connection(sock);
2260 /* Remove this thread from the connection threads list */
2261 pthread_mutex_lock (&connection_threads_lock);
2262 connection_threads_num--;
2263 if (connection_threads_num <= 0)
2264 pthread_cond_broadcast(&connection_threads_done);
2265 pthread_mutex_unlock (&connection_threads_lock);
2267 return (NULL);
2268 } /* }}} void *connection_thread_main */
2270 static int open_listen_socket_unix (const listen_socket_t *sock) /* {{{ */
2271 {
2272 int fd;
2273 struct sockaddr_un sa;
2274 listen_socket_t *temp;
2275 int status;
2276 const char *path;
2277 char *path_copy, *dir;
2279 path = sock->addr;
2280 if (strncmp(path, "unix:", strlen("unix:")) == 0)
2281 path += strlen("unix:");
2283 /* dirname may modify its argument */
2284 path_copy = strdup(path);
2285 if (path_copy == NULL)
2286 {
2287 fprintf(stderr, "rrdcached: strdup(): %s\n",
2288 rrd_strerror(errno));
2289 return (-1);
2290 }
2292 dir = dirname(path_copy);
2293 if (rrd_mkdir_p(dir, 0777) != 0)
2294 {
2295 fprintf(stderr, "Failed to create socket directory '%s': %s\n",
2296 dir, rrd_strerror(errno));
2297 return (-1);
2298 }
2300 free(path_copy);
2302 temp = (listen_socket_t *) rrd_realloc (listen_fds,
2303 sizeof (listen_fds[0]) * (listen_fds_num + 1));
2304 if (temp == NULL)
2305 {
2306 fprintf (stderr, "rrdcached: open_listen_socket_unix: realloc failed.\n");
2307 return (-1);
2308 }
2309 listen_fds = temp;
2310 memcpy (listen_fds + listen_fds_num, sock, sizeof (listen_fds[0]));
2312 fd = socket (PF_UNIX, SOCK_STREAM, /* protocol = */ 0);
2313 if (fd < 0)
2314 {
2315 fprintf (stderr, "rrdcached: unix socket(2) failed: %s\n",
2316 rrd_strerror(errno));
2317 return (-1);
2318 }
2320 memset (&sa, 0, sizeof (sa));
2321 sa.sun_family = AF_UNIX;
2322 strncpy (sa.sun_path, path, sizeof (sa.sun_path) - 1);
2324 /* if we've gotten this far, we own the pid file. any daemon started
2325 * with the same args must not be alive. therefore, ensure that we can
2326 * create the socket...
2327 */
2328 unlink(path);
2330 status = bind (fd, (struct sockaddr *) &sa, sizeof (sa));
2331 if (status != 0)
2332 {
2333 fprintf (stderr, "rrdcached: bind(%s) failed: %s.\n",
2334 path, rrd_strerror(errno));
2335 close (fd);
2336 return (-1);
2337 }
2339 /* tweak the sockets group ownership */
2340 if (sock->socket_group != (gid_t)-1)
2341 {
2342 if ( (chown(path, getuid(), sock->socket_group) != 0) ||
2343 (chmod(path, (S_IRUSR|S_IWUSR|S_IXUSR | S_IRGRP|S_IWGRP)) != 0) )
2344 {
2345 fprintf(stderr, "rrdcached: failed to set socket group permissions (%s)\n", strerror(errno));
2346 }
2347 }
2349 if (sock->socket_permissions != (mode_t)-1)
2350 {
2351 if (chmod(path, sock->socket_permissions) != 0)
2352 fprintf(stderr, "rrdcached: failed to set socket file permissions (%o): %s\n",
2353 (unsigned int)sock->socket_permissions, strerror(errno));
2354 }
2356 status = listen (fd, /* backlog = */ 10);
2357 if (status != 0)
2358 {
2359 fprintf (stderr, "rrdcached: listen(%s) failed: %s.\n",
2360 path, rrd_strerror(errno));
2361 close (fd);
2362 unlink (path);
2363 return (-1);
2364 }
2366 listen_fds[listen_fds_num].fd = fd;
2367 listen_fds[listen_fds_num].family = PF_UNIX;
2368 strncpy(listen_fds[listen_fds_num].addr, path,
2369 sizeof (listen_fds[listen_fds_num].addr) - 1);
2370 listen_fds_num++;
2372 return (0);
2373 } /* }}} int open_listen_socket_unix */
2375 static int open_listen_socket_network(const listen_socket_t *sock) /* {{{ */
2376 {
2377 struct addrinfo ai_hints;
2378 struct addrinfo *ai_res;
2379 struct addrinfo *ai_ptr;
2380 char addr_copy[NI_MAXHOST];
2381 char *addr;
2382 char *port;
2383 int status;
2385 strncpy (addr_copy, sock->addr, sizeof(addr_copy)-1);
2386 addr_copy[sizeof (addr_copy) - 1] = 0;
2387 addr = addr_copy;
2389 memset (&ai_hints, 0, sizeof (ai_hints));
2390 ai_hints.ai_flags = 0;
2391 #ifdef AI_ADDRCONFIG
2392 ai_hints.ai_flags |= AI_ADDRCONFIG;
2393 #endif
2394 ai_hints.ai_family = AF_UNSPEC;
2395 ai_hints.ai_socktype = SOCK_STREAM;
2397 port = NULL;
2398 if (*addr == '[') /* IPv6+port format */
2399 {
2400 /* `addr' is something like "[2001:780:104:2:211:24ff:feab:26f8]:12345" */
2401 addr++;
2403 port = strchr (addr, ']');
2404 if (port == NULL)
2405 {
2406 fprintf (stderr, "rrdcached: Malformed address: %s\n", sock->addr);
2407 return (-1);
2408 }
2409 *port = 0;
2410 port++;
2412 if (*port == ':')
2413 port++;
2414 else if (*port == 0)
2415 port = NULL;
2416 else
2417 {
2418 fprintf (stderr, "rrdcached: Garbage after address: %s\n", port);
2419 return (-1);
2420 }
2421 } /* if (*addr == '[') */
2422 else
2423 {
2424 port = rindex(addr, ':');
2425 if (port != NULL)
2426 {
2427 *port = 0;
2428 port++;
2429 }
2430 }
2431 ai_res = NULL;
2432 status = getaddrinfo (addr,
2433 port == NULL ? RRDCACHED_DEFAULT_PORT : port,
2434 &ai_hints, &ai_res);
2435 if (status != 0)
2436 {
2437 fprintf (stderr, "rrdcached: getaddrinfo(%s) failed: %s\n",
2438 addr, gai_strerror (status));
2439 return (-1);
2440 }
2442 for (ai_ptr = ai_res; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2443 {
2444 int fd;
2445 listen_socket_t *temp;
2446 int one = 1;
2448 temp = (listen_socket_t *) rrd_realloc (listen_fds,
2449 sizeof (listen_fds[0]) * (listen_fds_num + 1));
2450 if (temp == NULL)
2451 {
2452 fprintf (stderr,
2453 "rrdcached: open_listen_socket_network: realloc failed.\n");
2454 continue;
2455 }
2456 listen_fds = temp;
2457 memcpy (listen_fds + listen_fds_num, sock, sizeof (listen_fds[0]));
2459 fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
2460 if (fd < 0)
2461 {
2462 fprintf (stderr, "rrdcached: network socket(2) failed: %s.\n",
2463 rrd_strerror(errno));
2464 continue;
2465 }
2467 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
2469 status = bind (fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
2470 if (status != 0)
2471 {
2472 fprintf (stderr, "rrdcached: bind(%s) failed: %s.\n",
2473 sock->addr, rrd_strerror(errno));
2474 close (fd);
2475 continue;
2476 }
2478 status = listen (fd, /* backlog = */ 10);
2479 if (status != 0)
2480 {
2481 fprintf (stderr, "rrdcached: listen(%s) failed: %s\n.",
2482 sock->addr, rrd_strerror(errno));
2483 close (fd);
2484 freeaddrinfo(ai_res);
2485 return (-1);
2486 }
2488 listen_fds[listen_fds_num].fd = fd;
2489 listen_fds[listen_fds_num].family = ai_ptr->ai_family;
2490 listen_fds_num++;
2491 } /* for (ai_ptr) */
2493 freeaddrinfo(ai_res);
2494 return (0);
2495 } /* }}} static int open_listen_socket_network */
2497 static int open_listen_socket (const listen_socket_t *sock) /* {{{ */
2498 {
2499 assert(sock != NULL);
2500 assert(sock->addr != NULL);
2502 if (strncmp ("unix:", sock->addr, strlen ("unix:")) == 0
2503 || sock->addr[0] == '/')
2504 return (open_listen_socket_unix(sock));
2505 else
2506 return (open_listen_socket_network(sock));
2507 } /* }}} int open_listen_socket */
2509 static int close_listen_sockets (void) /* {{{ */
2510 {
2511 size_t i;
2513 for (i = 0; i < listen_fds_num; i++)
2514 {
2515 close (listen_fds[i].fd);
2517 if (listen_fds[i].family == PF_UNIX)
2518 unlink(listen_fds[i].addr);
2519 }
2521 free (listen_fds);
2522 listen_fds = NULL;
2523 listen_fds_num = 0;
2525 return (0);
2526 } /* }}} int close_listen_sockets */
2528 static void *listen_thread_main (void *args __attribute__((unused))) /* {{{ */
2529 {
2530 struct pollfd *pollfds;
2531 int pollfds_num;
2532 int status;
2533 int i;
2535 if (listen_fds_num < 1)
2536 {
2537 RRDD_LOG(LOG_ERR, "listen_thread_main: no listen_fds !");
2538 return (NULL);
2539 }
2541 pollfds_num = listen_fds_num;
2542 pollfds = (struct pollfd *) malloc (sizeof (*pollfds) * pollfds_num);
2543 if (pollfds == NULL)
2544 {
2545 RRDD_LOG (LOG_ERR, "listen_thread_main: malloc failed.");
2546 return (NULL);
2547 }
2548 memset (pollfds, 0, sizeof (*pollfds) * pollfds_num);
2550 RRDD_LOG(LOG_INFO, "listening for connections");
2552 while (state == RUNNING)
2553 {
2554 for (i = 0; i < pollfds_num; i++)
2555 {
2556 pollfds[i].fd = listen_fds[i].fd;
2557 pollfds[i].events = POLLIN | POLLPRI;
2558 pollfds[i].revents = 0;
2559 }
2561 status = poll (pollfds, pollfds_num, /* timeout = */ 1000);
2562 if (state != RUNNING)
2563 break;
2564 else if (status == 0) /* timeout */
2565 continue;
2566 else if (status < 0) /* error */
2567 {
2568 status = errno;
2569 if (status != EINTR)
2570 {
2571 RRDD_LOG (LOG_ERR, "listen_thread_main: poll(2) failed.");
2572 }
2573 continue;
2574 }
2576 for (i = 0; i < pollfds_num; i++)
2577 {
2578 listen_socket_t *client_sock;
2579 struct sockaddr_storage client_sa;
2580 socklen_t client_sa_size;
2581 pthread_t tid;
2582 pthread_attr_t attr;
2584 if (pollfds[i].revents == 0)
2585 continue;
2587 if ((pollfds[i].revents & (POLLIN | POLLPRI)) == 0)
2588 {
2589 RRDD_LOG (LOG_ERR, "listen_thread_main: "
2590 "poll(2) returned something unexpected for listen FD #%i.",
2591 pollfds[i].fd);
2592 continue;
2593 }
2595 client_sock = (listen_socket_t *) malloc (sizeof (listen_socket_t));
2596 if (client_sock == NULL)
2597 {
2598 RRDD_LOG (LOG_ERR, "listen_thread_main: malloc failed.");
2599 continue;
2600 }
2601 memcpy(client_sock, &listen_fds[i], sizeof(listen_fds[0]));
2603 client_sa_size = sizeof (client_sa);
2604 client_sock->fd = accept (pollfds[i].fd,
2605 (struct sockaddr *) &client_sa, &client_sa_size);
2606 if (client_sock->fd < 0)
2607 {
2608 RRDD_LOG (LOG_ERR, "listen_thread_main: accept(2) failed.");
2609 free(client_sock);
2610 continue;
2611 }
2613 pthread_attr_init (&attr);
2614 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
2616 status = pthread_create (&tid, &attr, connection_thread_main,
2617 client_sock);
2618 if (status != 0)
2619 {
2620 RRDD_LOG (LOG_ERR, "listen_thread_main: pthread_create failed.");
2621 close_connection(client_sock);
2622 continue;
2623 }
2624 } /* for (pollfds_num) */
2625 } /* while (state == RUNNING) */
2627 RRDD_LOG(LOG_INFO, "starting shutdown");
2629 close_listen_sockets ();
2631 pthread_mutex_lock (&connection_threads_lock);
2632 while (connection_threads_num > 0)
2633 pthread_cond_wait(&connection_threads_done, &connection_threads_lock);
2634 pthread_mutex_unlock (&connection_threads_lock);
2636 free(pollfds);
2638 return (NULL);
2639 } /* }}} void *listen_thread_main */
2641 static int daemonize (void) /* {{{ */
2642 {
2643 int pid_fd;
2644 char *base_dir;
2646 daemon_uid = geteuid();
2648 pid_fd = open_pidfile("create", O_CREAT|O_EXCL|O_WRONLY);
2649 if (pid_fd < 0)
2650 pid_fd = check_pidfile();
2651 if (pid_fd < 0)
2652 return pid_fd;
2654 /* open all the listen sockets */
2655 if (config_listen_address_list_len > 0)
2656 {
2657 for (size_t i = 0; i < config_listen_address_list_len; i++)
2658 open_listen_socket (config_listen_address_list[i]);
2660 rrd_free_ptrs((void ***) &config_listen_address_list,
2661 &config_listen_address_list_len);
2662 }
2663 else
2664 {
2665 listen_socket_t sock;
2666 memset(&sock, 0, sizeof(sock));
2667 strncpy(sock.addr, RRDCACHED_DEFAULT_ADDRESS, sizeof(sock.addr)-1);
2668 open_listen_socket (&sock);
2669 }
2671 if (listen_fds_num < 1)
2672 {
2673 fprintf (stderr, "rrdcached: FATAL: cannot open any listen sockets\n");
2674 goto error;
2675 }
2677 if (!stay_foreground)
2678 {
2679 pid_t child;
2681 child = fork ();
2682 if (child < 0)
2683 {
2684 fprintf (stderr, "daemonize: fork(2) failed.\n");
2685 goto error;
2686 }
2687 else if (child > 0)
2688 exit(0);
2690 /* Become session leader */
2691 setsid ();
2693 /* Open the first three file descriptors to /dev/null */
2694 close (2);
2695 close (1);
2696 close (0);
2698 open ("/dev/null", O_RDWR);
2699 if (dup(0) == -1 || dup(0) == -1){
2700 RRDD_LOG (LOG_ERR, "faild to run dup.\n");
2701 }
2702 } /* if (!stay_foreground) */
2704 /* Change into the /tmp directory. */
2705 base_dir = (config_base_dir != NULL)
2706 ? config_base_dir
2707 : "/tmp";
2709 if (chdir (base_dir) != 0)
2710 {
2711 fprintf (stderr, "daemonize: chdir (%s) failed.\n", base_dir);
2712 goto error;
2713 }
2715 install_signal_handlers();
2717 openlog ("rrdcached", LOG_PID, LOG_DAEMON);
2718 RRDD_LOG(LOG_INFO, "starting up");
2720 cache_tree = g_tree_new_full ((GCompareDataFunc) strcmp, NULL, NULL,
2721 (GDestroyNotify) free_cache_item);
2722 if (cache_tree == NULL)
2723 {
2724 RRDD_LOG (LOG_ERR, "daemonize: g_tree_new failed.");
2725 goto error;
2726 }
2728 return write_pidfile (pid_fd);
2730 error:
2731 remove_pidfile();
2732 return -1;
2733 } /* }}} int daemonize */
2735 static int cleanup (void) /* {{{ */
2736 {
2737 pthread_cond_broadcast (&flush_cond);
2738 pthread_join (flush_thread, NULL);
2740 pthread_cond_broadcast (&queue_cond);
2741 for (int i = 0; i < config_queue_threads; i++)
2742 pthread_join (queue_threads[i], NULL);
2744 if (config_flush_at_shutdown)
2745 {
2746 assert(cache_queue_head == NULL);
2747 RRDD_LOG(LOG_INFO, "clean shutdown; all RRDs flushed");
2748 }
2750 free(queue_threads);
2751 free(config_base_dir);
2753 pthread_mutex_lock(&cache_lock);
2754 g_tree_destroy(cache_tree);
2756 pthread_mutex_lock(&journal_lock);
2757 journal_done();
2759 RRDD_LOG(LOG_INFO, "goodbye");
2760 closelog ();
2762 remove_pidfile ();
2763 free(config_pid_file);
2765 return (0);
2766 } /* }}} int cleanup */
2768 static int read_options (int argc, char **argv) /* {{{ */
2769 {
2770 int option;
2771 int status = 0;
2773 char **permissions = NULL;
2774 size_t permissions_len = 0;
2776 gid_t socket_group = (gid_t)-1;
2777 mode_t socket_permissions = (mode_t)-1;
2779 while ((option = getopt(argc, argv, "gl:s:m:P:f:w:z:t:Bb:p:Fj:h?")) != -1)
2780 {
2781 switch (option)
2782 {
2783 case 'g':
2784 stay_foreground=1;
2785 break;
2787 case 'l':
2788 {
2789 listen_socket_t *new;
2791 new = malloc(sizeof(listen_socket_t));
2792 if (new == NULL)
2793 {
2794 fprintf(stderr, "read_options: malloc failed.\n");
2795 return(2);
2796 }
2797 memset(new, 0, sizeof(listen_socket_t));
2799 strncpy(new->addr, optarg, sizeof(new->addr)-1);
2801 /* Add permissions to the socket {{{ */
2802 if (permissions_len != 0)
2803 {
2804 size_t i;
2805 for (i = 0; i < permissions_len; i++)
2806 {
2807 status = socket_permission_add (new, permissions[i]);
2808 if (status != 0)
2809 {
2810 fprintf (stderr, "read_options: Adding permission \"%s\" to "
2811 "socket failed. Most likely, this permission doesn't "
2812 "exist. Check your command line.\n", permissions[i]);
2813 status = 4;
2814 }
2815 }
2816 }
2817 else /* if (permissions_len == 0) */
2818 {
2819 /* Add permission for ALL commands to the socket. */
2820 size_t i;
2821 for (i = 0; i < list_of_commands_len; i++)
2822 {
2823 status = socket_permission_add (new, list_of_commands[i].cmd);
2824 if (status != 0)
2825 {
2826 fprintf (stderr, "read_options: Adding permission \"%s\" to "
2827 "socket failed. This should never happen, ever! Sorry.\n",
2828 permissions[i]);
2829 status = 4;
2830 }
2831 }
2832 }
2833 /* }}} Done adding permissions. */
2835 new->socket_group = socket_group;
2836 new->socket_permissions = socket_permissions;
2838 if (!rrd_add_ptr((void ***)&config_listen_address_list,
2839 &config_listen_address_list_len, new))
2840 {
2841 fprintf(stderr, "read_options: rrd_add_ptr failed.\n");
2842 return (2);
2843 }
2844 }
2845 break;
2847 /* set socket group permissions */
2848 case 's':
2849 {
2850 gid_t group_gid;
2851 struct group *grp;
2853 group_gid = strtoul(optarg, NULL, 10);
2854 if (errno != EINVAL && group_gid>0)
2855 {
2856 /* we were passed a number */
2857 grp = getgrgid(group_gid);
2858 }
2859 else
2860 {
2861 grp = getgrnam(optarg);
2862 }
2864 if (grp)
2865 {
2866 socket_group = grp->gr_gid;
2867 }
2868 else
2869 {
2870 /* no idea what the user wanted... */
2871 fprintf (stderr, "read_options: couldn't map \"%s\" to a group, Sorry\n", optarg);
2872 return (5);
2873 }
2874 }
2875 break;
2877 /* set socket file permissions */
2878 case 'm':
2879 {
2880 long tmp;
2881 char *endptr = NULL;
2883 tmp = strtol (optarg, &endptr, 8);
2884 if ((endptr == optarg) || (! endptr) || (*endptr != '\0')
2885 || (tmp > 07777) || (tmp < 0)) {
2886 fprintf (stderr, "read_options: Invalid file mode \"%s\".\n",
2887 optarg);
2888 return (5);
2889 }
2891 socket_permissions = (mode_t)tmp;
2892 }
2893 break;
2895 case 'P':
2896 {
2897 char *optcopy;
2898 char *saveptr;
2899 char *dummy;
2900 char *ptr;
2902 rrd_free_ptrs ((void *) &permissions, &permissions_len);
2904 optcopy = strdup (optarg);
2905 dummy = optcopy;
2906 saveptr = NULL;
2907 while ((ptr = strtok_r (dummy, ", ", &saveptr)) != NULL)
2908 {
2909 dummy = NULL;
2910 rrd_add_strdup ((void *) &permissions, &permissions_len, ptr);
2911 }
2913 free (optcopy);
2914 }
2915 break;
2917 case 'f':
2918 {
2919 int temp;
2921 temp = atoi (optarg);
2922 if (temp > 0)
2923 config_flush_interval = temp;
2924 else
2925 {
2926 fprintf (stderr, "Invalid flush interval: %s\n", optarg);
2927 status = 3;
2928 }
2929 }
2930 break;
2932 case 'w':
2933 {
2934 int temp;
2936 temp = atoi (optarg);
2937 if (temp > 0)
2938 config_write_interval = temp;
2939 else
2940 {
2941 fprintf (stderr, "Invalid write interval: %s\n", optarg);
2942 status = 2;
2943 }
2944 }
2945 break;
2947 case 'z':
2948 {
2949 int temp;
2951 temp = atoi(optarg);
2952 if (temp > 0)
2953 config_write_jitter = temp;
2954 else
2955 {
2956 fprintf (stderr, "Invalid write jitter: -z %s\n", optarg);
2957 status = 2;
2958 }
2960 break;
2961 }
2963 case 't':
2964 {
2965 int threads;
2966 threads = atoi(optarg);
2967 if (threads >= 1)
2968 config_queue_threads = threads;
2969 else
2970 {
2971 fprintf (stderr, "Invalid thread count: -t %s\n", optarg);
2972 return 1;
2973 }
2974 }
2975 break;
2977 case 'B':
2978 config_write_base_only = 1;
2979 break;
2981 case 'b':
2982 {
2983 size_t len;
2984 char base_realpath[PATH_MAX];
2986 if (config_base_dir != NULL)
2987 free (config_base_dir);
2988 config_base_dir = strdup (optarg);
2989 if (config_base_dir == NULL)
2990 {
2991 fprintf (stderr, "read_options: strdup failed.\n");
2992 return (3);
2993 }
2995 if (rrd_mkdir_p (config_base_dir, 0777) != 0)
2996 {
2997 fprintf (stderr, "Failed to create base directory '%s': %s\n",
2998 config_base_dir, rrd_strerror (errno));
2999 return (3);
3000 }
3002 /* make sure that the base directory is not resolved via
3003 * symbolic links. this makes some performance-enhancing
3004 * assumptions possible (we don't have to resolve paths
3005 * that start with a "/")
3006 */
3007 if (realpath(config_base_dir, base_realpath) == NULL)
3008 {
3009 fprintf (stderr, "Failed to canonicalize the base directory '%s': "
3010 "%s\n", config_base_dir, rrd_strerror(errno));
3011 return 5;
3012 }
3014 len = strlen (config_base_dir);
3015 while ((len > 0) && (config_base_dir[len - 1] == '/'))
3016 {
3017 config_base_dir[len - 1] = 0;
3018 len--;
3019 }
3021 if (len < 1)
3022 {
3023 fprintf (stderr, "Invalid base directory: %s\n", optarg);
3024 return (4);
3025 }
3027 _config_base_dir_len = len;
3029 len = strlen (base_realpath);
3030 while ((len > 0) && (base_realpath[len - 1] == '/'))
3031 {
3032 base_realpath[len - 1] = '\0';
3033 len--;
3034 }
3036 if (strncmp(config_base_dir,
3037 base_realpath, sizeof(base_realpath)) != 0)
3038 {
3039 fprintf(stderr,
3040 "Base directory (-b) resolved via file system links!\n"
3041 "Please consult rrdcached '-b' documentation!\n"
3042 "Consider specifying the real directory (%s)\n",
3043 base_realpath);
3044 return 5;
3045 }
3046 }
3047 break;
3049 case 'p':
3050 {
3051 if (config_pid_file != NULL)
3052 free (config_pid_file);
3053 config_pid_file = strdup (optarg);
3054 if (config_pid_file == NULL)
3055 {
3056 fprintf (stderr, "read_options: strdup failed.\n");
3057 return (3);
3058 }
3059 }
3060 break;
3062 case 'F':
3063 config_flush_at_shutdown = 1;
3064 break;
3066 case 'j':
3067 {
3068 const char *dir = journal_dir = strdup(optarg);
3070 status = rrd_mkdir_p(dir, 0777);
3071 if (status != 0)
3072 {
3073 fprintf(stderr, "Failed to create journal directory '%s': %s\n",
3074 dir, rrd_strerror(errno));
3075 return 6;
3076 }
3078 if (access(dir, R_OK|W_OK|X_OK) != 0)
3079 {
3080 fprintf(stderr, "Must specify a writable directory with -j! (%s)\n",
3081 errno ? rrd_strerror(errno) : "");
3082 return 6;
3083 }
3084 }
3085 break;
3087 case 'h':
3088 case '?':
3089 printf ("RRDCacheD %s\n"
3090 "Copyright (C) 2008,2009 Florian octo Forster and Kevin Brintnall\n"
3091 "\n"
3092 "Usage: rrdcached [options]\n"
3093 "\n"
3094 "Valid options are:\n"
3095 " -l <address> Socket address to listen to.\n"
3096 " -P <perms> Sets the permissions to assign to all following "
3097 "sockets\n"
3098 " -w <seconds> Interval in which to write data.\n"
3099 " -z <delay> Delay writes up to <delay> seconds to spread load\n"
3100 " -t <threads> Number of write threads.\n"
3101 " -f <seconds> Interval in which to flush dead data.\n"
3102 " -p <file> Location of the PID-file.\n"
3103 " -b <dir> Base directory to change to.\n"
3104 " -B Restrict file access to paths within -b <dir>\n"
3105 " -g Do not fork and run in the foreground.\n"
3106 " -j <dir> Directory in which to create the journal files.\n"
3107 " -F Always flush all updates at shutdown\n"
3108 " -s <id|name> Group owner of all following UNIX sockets\n"
3109 " (the socket will also have read/write permissions "
3110 "for that group)\n"
3111 " -m <mode> File permissions (octal) of all following UNIX "
3112 "sockets\n"
3113 "\n"
3114 "For more information and a detailed description of all options "
3115 "please refer\n"
3116 "to the rrdcached(1) manual page.\n",
3117 VERSION);
3118 if (option == 'h')
3119 status = -1;
3120 else
3121 status = 1;
3122 break;
3123 } /* switch (option) */
3124 } /* while (getopt) */
3126 /* advise the user when values are not sane */
3127 if (config_flush_interval < 2 * config_write_interval)
3128 fprintf(stderr, "WARNING: flush interval (-f) should be at least"
3129 " 2x write interval (-w) !\n");
3130 if (config_write_jitter > config_write_interval)
3131 fprintf(stderr, "WARNING: write delay (-z) should NOT be larger than"
3132 " write interval (-w) !\n");
3134 if (config_write_base_only && config_base_dir == NULL)
3135 fprintf(stderr, "WARNING: -B does not make sense without -b!\n"
3136 " Consult the rrdcached documentation\n");
3138 if (journal_dir == NULL)
3139 config_flush_at_shutdown = 1;
3141 rrd_free_ptrs ((void *) &permissions, &permissions_len);
3143 return (status);
3144 } /* }}} int read_options */
3146 int main (int argc, char **argv)
3147 {
3148 int status;
3150 status = read_options (argc, argv);
3151 if (status != 0)
3152 {
3153 if (status < 0)
3154 status = 0;
3155 return (status);
3156 }
3158 status = daemonize ();
3159 if (status != 0)
3160 {
3161 fprintf (stderr, "rrdcached: daemonize failed, exiting.\n");
3162 return (1);
3163 }
3165 journal_init();
3167 /* start the queue threads */
3168 queue_threads = calloc(config_queue_threads, sizeof(*queue_threads));
3169 if (queue_threads == NULL)
3170 {
3171 RRDD_LOG (LOG_ERR, "FATAL: cannot calloc queue threads");
3172 cleanup();
3173 return (1);
3174 }
3175 for (int i = 0; i < config_queue_threads; i++)
3176 {
3177 memset (&queue_threads[i], 0, sizeof (*queue_threads));
3178 status = pthread_create (&queue_threads[i], NULL, queue_thread_main, NULL);
3179 if (status != 0)
3180 {
3181 RRDD_LOG (LOG_ERR, "FATAL: cannot create queue thread");
3182 cleanup();
3183 return (1);
3184 }
3185 }
3187 /* start the flush thread */
3188 memset(&flush_thread, 0, sizeof(flush_thread));
3189 status = pthread_create (&flush_thread, NULL, flush_thread_main, NULL);
3190 if (status != 0)
3191 {
3192 RRDD_LOG (LOG_ERR, "FATAL: cannot create flush thread");
3193 cleanup();
3194 return (1);
3195 }
3197 listen_thread_main (NULL);
3198 cleanup ();
3200 return (0);
3201 } /* int main */
3203 /*
3204 * vim: set sw=2 sts=2 ts=8 et fdm=marker :
3205 */