2 * RRDTool - src/rrd_daemon.c
3 * Copyright (C) 2008 Florian octo Forster
4 * Copyright (C) 2008 Kevin Brintnall
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.
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.
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
20 * Florian octo Forster <octo at verplant.org>
21 * kevin brintnall <kbrint@rufus.net>
26 * First tell the compiler to stick to the C99 and POSIX standards as close as
29 #ifndef __STRICT_ANSI__ /* {{{ */
30 # define __STRICT_ANSI__
33 #ifndef _ISOC99_SOURCE
34 # define _ISOC99_SOURCE
37 #ifdef _POSIX_C_SOURCE
38 # undef _POSIX_C_SOURCE
40 #define _POSIX_C_SOURCE 200112L
42 /* Single UNIX needed for strdup. */
46 #define _XOPEN_SOURCE 500
63 * Now for some includes..
66 #if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(HAVE_CONFIG_H)
67 #include "../win32/config.h"
70 #include "../rrd_config.h"
75 #include "rrd_client.h"
86 #include <sys/types.h>
90 #include <sys/socket.h>
101 #include <glib-2.0/glib.h>
104 #define RRDD_LOG(severity, ...) syslog ((severity), __VA_ARGS__)
107 # define __attribute__(x) /**/
119 typedef enum { RESP_ERR = -1, RESP_OK = 0 } response_code;
121 struct listen_socket_s
124 char addr[PATH_MAX + 1];
126 socket_privilege privilege;
128 /* state for BATCH processing */
140 typedef struct listen_socket_s listen_socket_t;
143 typedef struct cache_item_s cache_item_t;
149 time_t last_flush_time;
150 time_t last_update_stamp;
151 #define CI_FLAGS_IN_TREE (1<<0)
152 #define CI_FLAGS_IN_QUEUE (1<<1)
154 pthread_cond_t flushed;
159 struct callback_flush_data_s
166 typedef struct callback_flush_data_s callback_flush_data_t;
173 typedef enum queue_side_e queue_side_t;
175 /* max length of socket command or response */
177 #define RBUF_SIZE (CMD_MAX*2)
182 static int stay_foreground = 0;
183 static uid_t daemon_uid;
185 static listen_socket_t *listen_fds = NULL;
186 static size_t listen_fds_num = 0;
188 static int do_shutdown = 0;
190 static pthread_t queue_thread;
192 static pthread_t *connection_threads = NULL;
193 static pthread_mutex_t connection_threads_lock = PTHREAD_MUTEX_INITIALIZER;
194 static int connection_threads_num = 0;
197 static GTree *cache_tree = NULL;
198 static cache_item_t *cache_queue_head = NULL;
199 static cache_item_t *cache_queue_tail = NULL;
200 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
201 static pthread_cond_t cache_cond = PTHREAD_COND_INITIALIZER;
203 static int config_write_interval = 300;
204 static int config_write_jitter = 0;
205 static int config_flush_interval = 3600;
206 static int config_flush_at_shutdown = 0;
207 static char *config_pid_file = NULL;
208 static char *config_base_dir = NULL;
209 static size_t _config_base_dir_len = 0;
210 static int config_write_base_only = 0;
212 static listen_socket_t **config_listen_address_list = NULL;
213 static int config_listen_address_list_len = 0;
215 static uint64_t stats_queue_length = 0;
216 static uint64_t stats_updates_received = 0;
217 static uint64_t stats_flush_received = 0;
218 static uint64_t stats_updates_written = 0;
219 static uint64_t stats_data_sets_written = 0;
220 static uint64_t stats_journal_bytes = 0;
221 static uint64_t stats_journal_rotate = 0;
222 static pthread_mutex_t stats_lock = PTHREAD_MUTEX_INITIALIZER;
224 /* Journaled updates */
225 static char *journal_cur = NULL;
226 static char *journal_old = NULL;
227 static FILE *journal_fh = NULL;
228 static pthread_mutex_t journal_lock = PTHREAD_MUTEX_INITIALIZER;
229 static int journal_write(char *cmd, char *args);
230 static void journal_done(void);
231 static void journal_rotate(void);
236 static void sig_common (const char *sig) /* {{{ */
238 RRDD_LOG(LOG_NOTICE, "caught SIG%s", sig);
240 pthread_cond_broadcast(&cache_cond);
241 } /* }}} void sig_common */
243 static void sig_int_handler (int s __attribute__((unused))) /* {{{ */
246 } /* }}} void sig_int_handler */
248 static void sig_term_handler (int s __attribute__((unused))) /* {{{ */
251 } /* }}} void sig_term_handler */
253 static void sig_usr1_handler (int s __attribute__((unused))) /* {{{ */
255 config_flush_at_shutdown = 1;
257 } /* }}} void sig_usr1_handler */
259 static void sig_usr2_handler (int s __attribute__((unused))) /* {{{ */
261 config_flush_at_shutdown = 0;
263 } /* }}} void sig_usr2_handler */
265 static void install_signal_handlers(void) /* {{{ */
267 /* These structures are static, because `sigaction' behaves weird if the are
269 static struct sigaction sa_int;
270 static struct sigaction sa_term;
271 static struct sigaction sa_pipe;
272 static struct sigaction sa_usr1;
273 static struct sigaction sa_usr2;
275 /* Install signal handlers */
276 memset (&sa_int, 0, sizeof (sa_int));
277 sa_int.sa_handler = sig_int_handler;
278 sigaction (SIGINT, &sa_int, NULL);
280 memset (&sa_term, 0, sizeof (sa_term));
281 sa_term.sa_handler = sig_term_handler;
282 sigaction (SIGTERM, &sa_term, NULL);
284 memset (&sa_pipe, 0, sizeof (sa_pipe));
285 sa_pipe.sa_handler = SIG_IGN;
286 sigaction (SIGPIPE, &sa_pipe, NULL);
288 memset (&sa_pipe, 0, sizeof (sa_usr1));
289 sa_usr1.sa_handler = sig_usr1_handler;
290 sigaction (SIGUSR1, &sa_usr1, NULL);
292 memset (&sa_usr2, 0, sizeof (sa_usr2));
293 sa_usr2.sa_handler = sig_usr2_handler;
294 sigaction (SIGUSR2, &sa_usr2, NULL);
296 } /* }}} void install_signal_handlers */
298 static int open_pidfile(char *action, int oflag) /* {{{ */
303 file = (config_pid_file != NULL)
305 : LOCALSTATEDIR "/run/rrdcached.pid";
307 fd = open(file, oflag, S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH);
309 fprintf(stderr, "rrdcached: can't %s pid file '%s' (%s)\n",
310 action, file, rrd_strerror(errno));
313 } /* }}} static int open_pidfile */
315 /* check existing pid file to see whether a daemon is running */
316 static int check_pidfile(void)
322 pid_fd = open_pidfile("open", O_RDWR);
326 if (read(pid_fd, pid_str, sizeof(pid_str)) <= 0)
333 /* another running process that we can signal COULD be
334 * a competing rrdcached */
335 if (pid != getpid() && kill(pid, 0) == 0)
338 "FATAL: Another rrdcached daemon is running?? (pid %d)\n", pid);
343 lseek(pid_fd, 0, SEEK_SET);
344 ftruncate(pid_fd, 0);
347 "rrdcached: removed stale PID file (no rrdcached on pid %d)\n"
348 "rrdcached: starting normally.\n", pid);
351 } /* }}} static int check_pidfile */
353 static int write_pidfile (int fd) /* {{{ */
360 fh = fdopen (fd, "w");
363 RRDD_LOG (LOG_ERR, "write_pidfile: fdopen() failed.");
368 fprintf (fh, "%i\n", (int) pid);
372 } /* }}} int write_pidfile */
374 static int remove_pidfile (void) /* {{{ */
379 file = (config_pid_file != NULL)
381 : LOCALSTATEDIR "/run/rrdcached.pid";
383 status = unlink (file);
387 } /* }}} int remove_pidfile */
389 static char *next_cmd (listen_socket_t *sock, ssize_t *len) /* {{{ */
393 eol = memchr(sock->rbuf + sock->next_cmd, '\n',
394 sock->next_read - sock->next_cmd);
398 /* no commands left, move remainder back to front of rbuf */
399 memmove(sock->rbuf, sock->rbuf + sock->next_cmd,
400 sock->next_read - sock->next_cmd);
401 sock->next_read -= sock->next_cmd;
408 char *cmd = sock->rbuf + sock->next_cmd;
411 sock->next_cmd = eol - sock->rbuf + 1;
413 if (eol > sock->rbuf && *(eol-1) == '\r')
414 *(--eol) = '\0'; /* handle "\r\n" EOL */
425 /* add the characters directly to the write buffer */
426 static int add_to_wbuf(listen_socket_t *sock, char *str, size_t len) /* {{{ */
430 assert(sock != NULL);
432 new_buf = rrd_realloc(sock->wbuf, sock->wbuf_len + len + 1);
435 RRDD_LOG(LOG_ERR, "add_to_wbuf: realloc failed");
439 strncpy(new_buf + sock->wbuf_len, str, len + 1);
441 sock->wbuf = new_buf;
442 sock->wbuf_len += len;
445 } /* }}} static int add_to_wbuf */
447 /* add the text to the "extra" info that's sent after the status line */
448 static int add_response_info(listen_socket_t *sock, char *fmt, ...) /* {{{ */
451 char buffer[CMD_MAX];
454 if (sock == NULL) return 0; /* journal replay mode */
455 if (sock->batch_start) return 0; /* no extra info returned when in BATCH */
458 #ifdef HAVE_VSNPRINTF
459 len = vsnprintf(buffer, sizeof(buffer)-1, fmt, argp);
461 len = vsprintf(buffer, fmt, argp);
466 RRDD_LOG(LOG_ERR, "add_response_info: vnsprintf failed");
470 return add_to_wbuf(sock, buffer, len);
471 } /* }}} static int add_response_info */
473 static int count_lines(char *str) /* {{{ */
479 while ((str = strchr(str, '\n')) != NULL)
487 } /* }}} static int count_lines */
489 /* send the response back to the user.
490 * returns 0 on success, -1 on error
491 * write buffer is always zeroed after this call */
492 static int send_response (listen_socket_t *sock, response_code rc,
493 char *fmt, ...) /* {{{ */
496 char buffer[CMD_MAX];
501 if (sock == NULL) return rc; /* journal replay mode */
503 if (sock->batch_start)
506 return rc; /* no response on success during BATCH */
507 lines = sock->batch_cmd;
509 else if (rc == RESP_OK)
510 lines = count_lines(sock->wbuf);
514 rclen = sprintf(buffer, "%d ", lines);
516 #ifdef HAVE_VSNPRINTF
517 len = vsnprintf(buffer+rclen, sizeof(buffer)-rclen-1, fmt, argp);
519 len = vsprintf(buffer+rclen, fmt, argp);
527 /* append the result to the wbuf, don't write to the user */
528 if (sock->batch_start)
529 return add_to_wbuf(sock, buffer, len);
531 /* first write must be complete */
532 if (len != write(sock->fd, buffer, len))
534 RRDD_LOG(LOG_INFO, "send_response: could not write status message");
538 if (sock->wbuf != NULL && rc == RESP_OK)
541 while (wrote < sock->wbuf_len)
543 ssize_t wb = write(sock->fd, sock->wbuf + wrote, sock->wbuf_len - wrote);
546 RRDD_LOG(LOG_INFO, "send_response: could not write results");
553 free(sock->wbuf); sock->wbuf = NULL;
559 static void wipe_ci_values(cache_item_t *ci, time_t when)
564 ci->last_flush_time = when;
565 if (config_write_jitter > 0)
566 ci->last_flush_time += (random() % config_write_jitter);
570 * remove a "cache_item_t" item from the queue.
571 * must hold 'cache_lock' when calling this
573 static void remove_from_queue(cache_item_t *ci) /* {{{ */
575 if (ci == NULL) return;
576 if ((ci->flags & CI_FLAGS_IN_QUEUE) == 0) return; /* not queued */
578 if (ci->prev == NULL)
579 cache_queue_head = ci->next; /* reset head */
581 ci->prev->next = ci->next;
583 if (ci->next == NULL)
584 cache_queue_tail = ci->prev; /* reset the tail */
586 ci->next->prev = ci->prev;
588 ci->next = ci->prev = NULL;
589 ci->flags &= ~CI_FLAGS_IN_QUEUE;
590 } /* }}} static void remove_from_queue */
592 /* free the resources associated with the cache_item_t
593 * must hold cache_lock when calling this function
595 static void *free_cache_item(cache_item_t *ci) /* {{{ */
597 if (ci == NULL) return NULL;
599 remove_from_queue(ci);
601 for (int i=0; i < ci->values_num; i++)
607 /* in case anyone is waiting */
608 pthread_cond_broadcast(&ci->flushed);
613 } /* }}} static void *free_cache_item */
616 * enqueue_cache_item:
617 * `cache_lock' must be acquired before calling this function!
619 static int enqueue_cache_item (cache_item_t *ci, /* {{{ */
625 if (ci->values_num == 0)
630 if (cache_queue_head == ci)
633 /* remove if further down in queue */
634 remove_from_queue(ci);
637 ci->next = cache_queue_head;
638 if (ci->next != NULL)
640 cache_queue_head = ci;
642 if (cache_queue_tail == NULL)
643 cache_queue_tail = cache_queue_head;
645 else /* (side == TAIL) */
647 /* We don't move values back in the list.. */
648 if (ci->flags & CI_FLAGS_IN_QUEUE)
651 assert (ci->next == NULL);
652 assert (ci->prev == NULL);
654 ci->prev = cache_queue_tail;
656 if (cache_queue_tail == NULL)
657 cache_queue_head = ci;
659 cache_queue_tail->next = ci;
661 cache_queue_tail = ci;
664 ci->flags |= CI_FLAGS_IN_QUEUE;
666 pthread_cond_broadcast(&cache_cond);
667 pthread_mutex_lock (&stats_lock);
668 stats_queue_length++;
669 pthread_mutex_unlock (&stats_lock);
672 } /* }}} int enqueue_cache_item */
675 * tree_callback_flush:
676 * Called via `g_tree_foreach' in `queue_thread_main'. `cache_lock' is held
677 * while this is in progress.
679 static gboolean tree_callback_flush (gpointer key, gpointer value, /* {{{ */
683 callback_flush_data_t *cfd;
685 ci = (cache_item_t *) value;
686 cfd = (callback_flush_data_t *) data;
688 if (ci->flags & CI_FLAGS_IN_QUEUE)
691 if ((ci->last_flush_time <= cfd->abs_timeout)
692 && (ci->values_num > 0))
694 enqueue_cache_item (ci, TAIL);
696 else if ((do_shutdown != 0)
697 && (ci->values_num > 0))
699 enqueue_cache_item (ci, TAIL);
701 else if (((cfd->now - ci->last_flush_time) >= config_flush_interval)
702 && (ci->values_num <= 0))
706 temp = (char **) rrd_realloc (cfd->keys,
707 sizeof (char *) * (cfd->keys_num + 1));
710 RRDD_LOG (LOG_ERR, "tree_callback_flush: realloc failed.");
714 /* Make really sure this points to the _same_ place */
715 assert ((char *) key == ci->file);
716 cfd->keys[cfd->keys_num] = (char *) key;
721 } /* }}} gboolean tree_callback_flush */
723 static int flush_old_values (int max_age)
725 callback_flush_data_t cfd;
728 memset (&cfd, 0, sizeof (cfd));
729 /* Pass the current time as user data so that we don't need to call
730 * `time' for each node. */
731 cfd.now = time (NULL);
736 cfd.abs_timeout = cfd.now - max_age;
738 cfd.abs_timeout = cfd.now + 2*config_write_jitter + 1;
740 /* `tree_callback_flush' will return the keys of all values that haven't
741 * been touched in the last `config_flush_interval' seconds in `cfd'.
742 * The char*'s in this array point to the same memory as ci->file, so we
743 * don't need to free them separately. */
744 g_tree_foreach (cache_tree, tree_callback_flush, (gpointer) &cfd);
746 for (k = 0; k < cfd.keys_num; k++)
748 /* should never fail, since we have held the cache_lock
750 assert( g_tree_remove(cache_tree, cfd.keys[k]) == TRUE );
753 if (cfd.keys != NULL)
760 } /* int flush_old_values */
762 static void *queue_thread_main (void *args __attribute__((unused))) /* {{{ */
765 struct timespec next_flush;
766 int final_flush = 0; /* make sure we only flush once on shutdown */
768 gettimeofday (&now, NULL);
769 next_flush.tv_sec = now.tv_sec + config_flush_interval;
770 next_flush.tv_nsec = 1000 * now.tv_usec;
772 pthread_mutex_lock (&cache_lock);
773 while ((do_shutdown == 0) || (cache_queue_head != NULL))
782 /* First, check if it's time to do the cache flush. */
783 gettimeofday (&now, NULL);
784 if ((now.tv_sec > next_flush.tv_sec)
785 || ((now.tv_sec == next_flush.tv_sec)
786 && ((1000 * now.tv_usec) > next_flush.tv_nsec)))
788 /* Flush all values that haven't been written in the last
789 * `config_write_interval' seconds. */
790 flush_old_values (config_write_interval);
792 /* Determine the time of the next cache flush. */
794 now.tv_sec + next_flush.tv_sec % config_flush_interval;
796 /* unlock the cache while we rotate so we don't block incoming
797 * updates if the fsync() blocks on disk I/O */
798 pthread_mutex_unlock(&cache_lock);
800 pthread_mutex_lock(&cache_lock);
803 /* Now, check if there's something to store away. If not, wait until
804 * something comes in or it's time to do the cache flush. if we are
805 * shutting down, do not wait around. */
806 if (cache_queue_head == NULL && !do_shutdown)
808 status = pthread_cond_timedwait (&cache_cond, &cache_lock, &next_flush);
809 if ((status != 0) && (status != ETIMEDOUT))
811 RRDD_LOG (LOG_ERR, "queue_thread_main: "
812 "pthread_cond_timedwait returned %i.", status);
816 /* We're about to shut down */
817 if (do_shutdown != 0 && !final_flush++)
819 if (config_flush_at_shutdown)
820 flush_old_values (-1); /* flush everything */
825 /* Check if a value has arrived. This may be NULL if we timed out or there
826 * was an interrupt such as a signal. */
827 if (cache_queue_head == NULL)
830 ci = cache_queue_head;
832 /* copy the relevant parts */
833 file = strdup (ci->file);
836 RRDD_LOG (LOG_ERR, "queue_thread_main: strdup failed.");
840 assert(ci->values != NULL);
841 assert(ci->values_num > 0);
844 values_num = ci->values_num;
846 wipe_ci_values(ci, time(NULL));
847 remove_from_queue(ci);
849 pthread_mutex_lock (&stats_lock);
850 assert (stats_queue_length > 0);
851 stats_queue_length--;
852 pthread_mutex_unlock (&stats_lock);
854 pthread_mutex_unlock (&cache_lock);
857 status = rrd_update_r (file, NULL, values_num, (void *) values);
860 RRDD_LOG (LOG_NOTICE, "queue_thread_main: "
861 "rrd_update_r (%s) failed with status %i. (%s)",
862 file, status, rrd_get_error());
865 journal_write("wrote", file);
866 pthread_cond_broadcast(&ci->flushed);
868 for (i = 0; i < values_num; i++)
876 pthread_mutex_lock (&stats_lock);
877 stats_updates_written++;
878 stats_data_sets_written += values_num;
879 pthread_mutex_unlock (&stats_lock);
882 pthread_mutex_lock (&cache_lock);
884 /* We're about to shut down */
885 if (do_shutdown != 0 && !final_flush++)
887 if (config_flush_at_shutdown)
888 flush_old_values (-1); /* flush everything */
892 } /* while ((do_shutdown == 0) || (cache_queue_head != NULL)) */
893 pthread_mutex_unlock (&cache_lock);
895 if (config_flush_at_shutdown)
897 assert(cache_queue_head == NULL);
898 RRDD_LOG(LOG_INFO, "clean shutdown; all RRDs flushed");
904 } /* }}} void *queue_thread_main */
906 static int buffer_get_field (char **buffer_ret, /* {{{ */
907 size_t *buffer_size_ret, char **field_ret)
916 buffer = *buffer_ret;
918 buffer_size = *buffer_size_ret;
922 if (buffer_size <= 0)
925 /* This is ensured by `handle_request'. */
926 assert (buffer[buffer_size - 1] == '\0');
929 while (buffer_pos < buffer_size)
931 /* Check for end-of-field or end-of-buffer */
932 if (buffer[buffer_pos] == ' ' || buffer[buffer_pos] == '\0')
934 field[field_size] = 0;
940 /* Handle escaped characters. */
941 else if (buffer[buffer_pos] == '\\')
943 if (buffer_pos >= (buffer_size - 1))
946 field[field_size] = buffer[buffer_pos];
950 /* Normal operation */
953 field[field_size] = buffer[buffer_pos];
957 } /* while (buffer_pos < buffer_size) */
962 *buffer_ret = buffer + buffer_pos;
963 *buffer_size_ret = buffer_size - buffer_pos;
967 } /* }}} int buffer_get_field */
969 /* if we're restricting writes to the base directory,
970 * check whether the file falls within the dir
971 * returns 1 if OK, otherwise 0
973 static int check_file_access (const char *file, listen_socket_t *sock) /* {{{ */
975 assert(file != NULL);
977 if (!config_write_base_only
978 || sock == NULL /* journal replay */
979 || config_base_dir == NULL)
982 if (strstr(file, "../") != NULL) goto err;
984 /* relative paths without "../" are ok */
985 if (*file != '/') return 1;
987 /* file must be of the format base + "/" + <1+ char filename> */
988 if (strlen(file) < _config_base_dir_len + 2) goto err;
989 if (strncmp(file, config_base_dir, _config_base_dir_len) != 0) goto err;
990 if (*(file + _config_base_dir_len) != '/') goto err;
995 if (sock != NULL && sock->fd >= 0)
996 send_response(sock, RESP_ERR, "%s\n", rrd_strerror(EACCES));
999 } /* }}} static int check_file_access */
1001 /* when using a base dir, convert relative paths to absolute paths.
1002 * if necessary, modifies the "filename" pointer to point
1003 * to the new path created in "tmp". "tmp" is provided
1004 * by the caller and sizeof(tmp) must be >= PATH_MAX.
1006 * this allows us to optimize for the expected case (absolute path)
1009 static void get_abs_path(char **filename, char *tmp)
1011 assert(tmp != NULL);
1012 assert(filename != NULL && *filename != NULL);
1014 if (config_base_dir == NULL || **filename == '/')
1017 snprintf(tmp, PATH_MAX, "%s/%s", config_base_dir, *filename);
1019 } /* }}} static int get_abs_path */
1021 /* returns 1 if we have the required privilege level,
1022 * otherwise issue an error to the user on sock */
1023 static int has_privilege (listen_socket_t *sock, /* {{{ */
1024 socket_privilege priv)
1026 if (sock == NULL) /* journal replay */
1029 if (sock->privilege >= priv)
1032 return send_response(sock, RESP_ERR, "%s\n", rrd_strerror(EACCES));
1033 } /* }}} static int has_privilege */
1035 static int flush_file (const char *filename) /* {{{ */
1039 pthread_mutex_lock (&cache_lock);
1041 ci = (cache_item_t *) g_tree_lookup (cache_tree, filename);
1044 pthread_mutex_unlock (&cache_lock);
1048 if (ci->values_num > 0)
1050 /* Enqueue at head */
1051 enqueue_cache_item (ci, HEAD);
1052 pthread_cond_wait(&ci->flushed, &cache_lock);
1055 /* DO NOT DO ANYTHING WITH ci HERE!! The entry
1056 * may have been purged during our cond_wait() */
1058 pthread_mutex_unlock(&cache_lock);
1061 } /* }}} int flush_file */
1063 static int handle_request_help (listen_socket_t *sock, /* {{{ */
1064 char *buffer, size_t buffer_size)
1070 char *help_help[2] =
1072 "Command overview\n"
1074 "HELP [<command>]\n"
1075 "FLUSH <filename>\n"
1077 "PENDING <filename>\n"
1078 "FORGET <filename>\n"
1080 "UPDATE <filename> <values> [<values> ...]\n"
1086 char *help_flush[2] =
1090 "Usage: FLUSH <filename>\n"
1092 "Adds the given filename to the head of the update queue and returns\n"
1093 "after is has been dequeued.\n"
1096 char *help_flushall[2] =
1098 "Help for FLUSHALL\n"
1102 "Triggers writing of all pending updates. Returns immediately.\n"
1105 char *help_pending[2] =
1107 "Help for PENDING\n"
1109 "Usage: PENDING <filename>\n"
1111 "Shows any 'pending' updates for a file, in order.\n"
1112 "The updates shown have not yet been written to the underlying RRD file.\n"
1115 char *help_forget[2] =
1119 "Usage: FORGET <filename>\n"
1121 "Removes the file completely from the cache.\n"
1122 "Any pending updates for the file will be lost.\n"
1125 char *help_queue[2] =
1129 "Shows all files in the output queue.\n"
1130 "The output is zero or more lines in the following format:\n"
1131 "(where <num_vals> is the number of values to be written)\n"
1133 "<num_vals> <filename>\n"
1137 char *help_update[2] =
1141 "Usage: UPDATE <filename> <values> [<values> ...]\n"
1143 "Adds the given file to the internal cache if it is not yet known and\n"
1144 "appends the given value(s) to the entry. See the rrdcached(1) manpage\n"
1147 "Each <values> has the following form:\n"
1148 " <values> = <time>:<value>[:<value>[...]]\n"
1149 "See the rrdupdate(1) manpage for details.\n"
1152 char *help_stats[2] =
1158 "Returns some performance counters, see the rrdcached(1) manpage for\n"
1159 "a description of the values.\n"
1162 char *help_batch[2] =
1166 "The 'BATCH' command permits the client to initiate a bulk load\n"
1167 " of commands to rrdcached.\n"
1172 " server: 0 Go ahead. End with dot '.' on its own line.\n"
1173 " client: command #1\n"
1174 " client: command #2\n"
1175 " client: ... and so on\n"
1177 " server: 2 errors\n"
1178 " server: 7 message for command #7\n"
1179 " server: 9 message for command #9\n"
1181 "For more information, consult the rrdcached(1) documentation.\n"
1184 char *help_quit[2] =
1188 "Disconnect from rrdcached.\n"
1191 status = buffer_get_field (&buffer, &buffer_size, &command);
1193 help_text = help_help;
1196 if (strcasecmp (command, "update") == 0)
1197 help_text = help_update;
1198 else if (strcasecmp (command, "flush") == 0)
1199 help_text = help_flush;
1200 else if (strcasecmp (command, "flushall") == 0)
1201 help_text = help_flushall;
1202 else if (strcasecmp (command, "pending") == 0)
1203 help_text = help_pending;
1204 else if (strcasecmp (command, "forget") == 0)
1205 help_text = help_forget;
1206 else if (strcasecmp (command, "queue") == 0)
1207 help_text = help_queue;
1208 else if (strcasecmp (command, "stats") == 0)
1209 help_text = help_stats;
1210 else if (strcasecmp (command, "batch") == 0)
1211 help_text = help_batch;
1212 else if (strcasecmp (command, "quit") == 0)
1213 help_text = help_quit;
1215 help_text = help_help;
1218 add_response_info(sock, help_text[1]);
1219 return send_response(sock, RESP_OK, help_text[0]);
1220 } /* }}} int handle_request_help */
1222 static int handle_request_stats (listen_socket_t *sock) /* {{{ */
1224 uint64_t copy_queue_length;
1225 uint64_t copy_updates_received;
1226 uint64_t copy_flush_received;
1227 uint64_t copy_updates_written;
1228 uint64_t copy_data_sets_written;
1229 uint64_t copy_journal_bytes;
1230 uint64_t copy_journal_rotate;
1232 uint64_t tree_nodes_number;
1233 uint64_t tree_depth;
1235 pthread_mutex_lock (&stats_lock);
1236 copy_queue_length = stats_queue_length;
1237 copy_updates_received = stats_updates_received;
1238 copy_flush_received = stats_flush_received;
1239 copy_updates_written = stats_updates_written;
1240 copy_data_sets_written = stats_data_sets_written;
1241 copy_journal_bytes = stats_journal_bytes;
1242 copy_journal_rotate = stats_journal_rotate;
1243 pthread_mutex_unlock (&stats_lock);
1245 pthread_mutex_lock (&cache_lock);
1246 tree_nodes_number = (uint64_t) g_tree_nnodes (cache_tree);
1247 tree_depth = (uint64_t) g_tree_height (cache_tree);
1248 pthread_mutex_unlock (&cache_lock);
1250 add_response_info(sock,
1251 "QueueLength: %"PRIu64"\n", copy_queue_length);
1252 add_response_info(sock,
1253 "UpdatesReceived: %"PRIu64"\n", copy_updates_received);
1254 add_response_info(sock,
1255 "FlushesReceived: %"PRIu64"\n", copy_flush_received);
1256 add_response_info(sock,
1257 "UpdatesWritten: %"PRIu64"\n", copy_updates_written);
1258 add_response_info(sock,
1259 "DataSetsWritten: %"PRIu64"\n", copy_data_sets_written);
1260 add_response_info(sock, "TreeNodesNumber: %"PRIu64"\n", tree_nodes_number);
1261 add_response_info(sock, "TreeDepth: %"PRIu64"\n", tree_depth);
1262 add_response_info(sock, "JournalBytes: %"PRIu64"\n", copy_journal_bytes);
1263 add_response_info(sock, "JournalRotate: %"PRIu64"\n", copy_journal_rotate);
1265 send_response(sock, RESP_OK, "Statistics follow\n");
1268 } /* }}} int handle_request_stats */
1270 static int handle_request_flush (listen_socket_t *sock, /* {{{ */
1271 char *buffer, size_t buffer_size)
1273 char *file, file_tmp[PATH_MAX];
1276 status = buffer_get_field (&buffer, &buffer_size, &file);
1279 return send_response(sock, RESP_ERR, "Usage: flush <filename>\n");
1283 pthread_mutex_lock(&stats_lock);
1284 stats_flush_received++;
1285 pthread_mutex_unlock(&stats_lock);
1287 get_abs_path(&file, file_tmp);
1288 if (!check_file_access(file, sock)) return 0;
1290 status = flush_file (file);
1292 return send_response(sock, RESP_OK, "Successfully flushed %s.\n", file);
1293 else if (status == ENOENT)
1295 /* no file in our tree; see whether it exists at all */
1296 struct stat statbuf;
1298 memset(&statbuf, 0, sizeof(statbuf));
1299 if (stat(file, &statbuf) == 0 && S_ISREG(statbuf.st_mode))
1300 return send_response(sock, RESP_OK, "Nothing to flush: %s.\n", file);
1302 return send_response(sock, RESP_ERR, "No such file: %s.\n", file);
1304 else if (status < 0)
1305 return send_response(sock, RESP_ERR, "Internal error.\n");
1307 return send_response(sock, RESP_ERR, "Failed with status %i.\n", status);
1312 } /* }}} int handle_request_flush */
1314 static int handle_request_flushall(listen_socket_t *sock) /* {{{ */
1318 status = has_privilege(sock, PRIV_HIGH);
1322 RRDD_LOG(LOG_DEBUG, "Received FLUSHALL");
1324 pthread_mutex_lock(&cache_lock);
1325 flush_old_values(-1);
1326 pthread_mutex_unlock(&cache_lock);
1328 return send_response(sock, RESP_OK, "Started flush.\n");
1329 } /* }}} static int handle_request_flushall */
1331 static int handle_request_pending(listen_socket_t *sock, /* {{{ */
1332 char *buffer, size_t buffer_size)
1335 char *file, file_tmp[PATH_MAX];
1338 status = buffer_get_field(&buffer, &buffer_size, &file);
1340 return send_response(sock, RESP_ERR,
1341 "Usage: PENDING <filename>\n");
1343 status = has_privilege(sock, PRIV_HIGH);
1347 get_abs_path(&file, file_tmp);
1349 pthread_mutex_lock(&cache_lock);
1350 ci = g_tree_lookup(cache_tree, file);
1353 pthread_mutex_unlock(&cache_lock);
1354 return send_response(sock, RESP_ERR, "%s\n", rrd_strerror(ENOENT));
1357 for (int i=0; i < ci->values_num; i++)
1358 add_response_info(sock, "%s\n", ci->values[i]);
1360 pthread_mutex_unlock(&cache_lock);
1361 return send_response(sock, RESP_OK, "updates pending\n");
1362 } /* }}} static int handle_request_pending */
1364 static int handle_request_forget(listen_socket_t *sock, /* {{{ */
1365 char *buffer, size_t buffer_size)
1369 char *file, file_tmp[PATH_MAX];
1371 status = buffer_get_field(&buffer, &buffer_size, &file);
1373 return send_response(sock, RESP_ERR,
1374 "Usage: FORGET <filename>\n");
1376 status = has_privilege(sock, PRIV_HIGH);
1380 get_abs_path(&file, file_tmp);
1381 if (!check_file_access(file, sock)) return 0;
1383 pthread_mutex_lock(&cache_lock);
1384 found = g_tree_remove(cache_tree, file);
1385 pthread_mutex_unlock(&cache_lock);
1390 journal_write("forget", file);
1392 return send_response(sock, RESP_OK, "Gone!\n");
1395 return send_response(sock, RESP_ERR, "%s\n", rrd_strerror(ENOENT));
1399 } /* }}} static int handle_request_forget */
1401 static int handle_request_queue (listen_socket_t *sock) /* {{{ */
1405 pthread_mutex_lock(&cache_lock);
1407 ci = cache_queue_head;
1410 add_response_info(sock, "%d %s\n", ci->values_num, ci->file);
1414 pthread_mutex_unlock(&cache_lock);
1416 return send_response(sock, RESP_OK, "in queue.\n");
1417 } /* }}} int handle_request_queue */
1419 static int handle_request_update (listen_socket_t *sock, /* {{{ */
1421 char *buffer, size_t buffer_size)
1423 char *file, file_tmp[PATH_MAX];
1426 char orig_buf[CMD_MAX];
1430 status = has_privilege(sock, PRIV_HIGH);
1434 /* save it for the journal later */
1435 strncpy(orig_buf, buffer, sizeof(orig_buf)-1);
1437 status = buffer_get_field (&buffer, &buffer_size, &file);
1439 return send_response(sock, RESP_ERR,
1440 "Usage: UPDATE <filename> <values> [<values> ...]\n");
1442 pthread_mutex_lock(&stats_lock);
1443 stats_updates_received++;
1444 pthread_mutex_unlock(&stats_lock);
1446 get_abs_path(&file, file_tmp);
1447 if (!check_file_access(file, sock)) return 0;
1449 pthread_mutex_lock (&cache_lock);
1450 ci = g_tree_lookup (cache_tree, file);
1452 if (ci == NULL) /* {{{ */
1454 struct stat statbuf;
1456 /* don't hold the lock while we setup; stat(2) might block */
1457 pthread_mutex_unlock(&cache_lock);
1459 memset (&statbuf, 0, sizeof (statbuf));
1460 status = stat (file, &statbuf);
1463 RRDD_LOG (LOG_NOTICE, "handle_request_update: stat (%s) failed.", file);
1466 if (status == ENOENT)
1467 return send_response(sock, RESP_ERR, "No such file: %s\n", file);
1469 return send_response(sock, RESP_ERR,
1470 "stat failed with error %i.\n", status);
1472 if (!S_ISREG (statbuf.st_mode))
1473 return send_response(sock, RESP_ERR, "Not a regular file: %s\n", file);
1475 if (access(file, R_OK|W_OK) != 0)
1476 return send_response(sock, RESP_ERR, "Cannot read/write %s: %s\n",
1477 file, rrd_strerror(errno));
1479 ci = (cache_item_t *) malloc (sizeof (cache_item_t));
1482 RRDD_LOG (LOG_ERR, "handle_request_update: malloc failed.");
1484 return send_response(sock, RESP_ERR, "malloc failed.\n");
1486 memset (ci, 0, sizeof (cache_item_t));
1488 ci->file = strdup (file);
1489 if (ci->file == NULL)
1492 RRDD_LOG (LOG_ERR, "handle_request_update: strdup failed.");
1494 return send_response(sock, RESP_ERR, "strdup failed.\n");
1497 wipe_ci_values(ci, now);
1498 ci->flags = CI_FLAGS_IN_TREE;
1499 pthread_cond_init(&ci->flushed, NULL);
1501 pthread_mutex_lock(&cache_lock);
1502 g_tree_replace (cache_tree, (void *) ci->file, (void *) ci);
1504 assert (ci != NULL);
1506 /* don't re-write updates in replay mode */
1508 journal_write("update", orig_buf);
1510 while (buffer_size > 0)
1517 status = buffer_get_field (&buffer, &buffer_size, &value);
1520 RRDD_LOG (LOG_INFO, "handle_request_update: Error reading field.");
1524 /* make sure update time is always moving forward */
1525 stamp = strtol(value, &eostamp, 10);
1526 if (eostamp == value || eostamp == NULL || *eostamp != ':')
1528 pthread_mutex_unlock(&cache_lock);
1529 return send_response(sock, RESP_ERR,
1530 "Cannot find timestamp in '%s'!\n", value);
1532 else if (stamp <= ci->last_update_stamp)
1534 pthread_mutex_unlock(&cache_lock);
1535 return send_response(sock, RESP_ERR,
1536 "illegal attempt to update using time %ld when last"
1537 " update time is %ld (minimum one second step)\n",
1538 stamp, ci->last_update_stamp);
1541 ci->last_update_stamp = stamp;
1543 temp = (char **) rrd_realloc (ci->values,
1544 sizeof (char *) * (ci->values_num + 1));
1547 RRDD_LOG (LOG_ERR, "handle_request_update: realloc failed.");
1552 ci->values[ci->values_num] = strdup (value);
1553 if (ci->values[ci->values_num] == NULL)
1555 RRDD_LOG (LOG_ERR, "handle_request_update: strdup failed.");
1563 if (((now - ci->last_flush_time) >= config_write_interval)
1564 && ((ci->flags & CI_FLAGS_IN_QUEUE) == 0)
1565 && (ci->values_num > 0))
1567 enqueue_cache_item (ci, TAIL);
1570 pthread_mutex_unlock (&cache_lock);
1573 return send_response(sock, RESP_ERR, "No values updated.\n");
1575 return send_response(sock, RESP_OK,
1576 "errors, enqueued %i value(s).\n", values_num);
1581 } /* }}} int handle_request_update */
1583 /* we came across a "WROTE" entry during journal replay.
1584 * throw away any values that we have accumulated for this file
1586 static int handle_request_wrote (const char *buffer, time_t now) /* {{{ */
1590 const char *file = buffer;
1592 pthread_mutex_lock(&cache_lock);
1594 ci = g_tree_lookup(cache_tree, file);
1597 pthread_mutex_unlock(&cache_lock);
1603 for (i=0; i < ci->values_num; i++)
1604 free(ci->values[i]);
1609 wipe_ci_values(ci, now);
1610 remove_from_queue(ci);
1612 pthread_mutex_unlock(&cache_lock);
1614 } /* }}} int handle_request_wrote */
1616 /* start "BATCH" processing */
1617 static int batch_start (listen_socket_t *sock) /* {{{ */
1620 if (sock->batch_start)
1621 return send_response(sock, RESP_ERR, "Already in BATCH\n");
1623 status = send_response(sock, RESP_OK,
1624 "Go ahead. End with dot '.' on its own line.\n");
1625 sock->batch_start = time(NULL);
1626 sock->batch_cmd = 0;
1629 } /* }}} static int batch_start */
1631 /* finish "BATCH" processing and return results to the client */
1632 static int batch_done (listen_socket_t *sock) /* {{{ */
1634 assert(sock->batch_start);
1635 sock->batch_start = 0;
1636 sock->batch_cmd = 0;
1637 return send_response(sock, RESP_OK, "errors\n");
1638 } /* }}} static int batch_done */
1640 /* if sock==NULL, we are in journal replay mode */
1641 static int handle_request (listen_socket_t *sock, /* {{{ */
1643 char *buffer, size_t buffer_size)
1649 assert (buffer[buffer_size - 1] == '\0');
1651 buffer_ptr = buffer;
1653 status = buffer_get_field (&buffer_ptr, &buffer_size, &command);
1656 RRDD_LOG (LOG_INFO, "handle_request: Unable parse command.");
1660 if (sock != NULL && sock->batch_start)
1663 if (strcasecmp (command, "update") == 0)
1664 return (handle_request_update (sock, now, buffer_ptr, buffer_size));
1665 else if (strcasecmp (command, "wrote") == 0 && sock == NULL)
1667 /* this is only valid in replay mode */
1668 return (handle_request_wrote (buffer_ptr, now));
1670 else if (strcasecmp (command, "flush") == 0)
1671 return (handle_request_flush (sock, buffer_ptr, buffer_size));
1672 else if (strcasecmp (command, "flushall") == 0)
1673 return (handle_request_flushall(sock));
1674 else if (strcasecmp (command, "pending") == 0)
1675 return (handle_request_pending(sock, buffer_ptr, buffer_size));
1676 else if (strcasecmp (command, "forget") == 0)
1677 return (handle_request_forget(sock, buffer_ptr, buffer_size));
1678 else if (strcasecmp (command, "queue") == 0)
1679 return (handle_request_queue(sock));
1680 else if (strcasecmp (command, "stats") == 0)
1681 return (handle_request_stats (sock));
1682 else if (strcasecmp (command, "help") == 0)
1683 return (handle_request_help (sock, buffer_ptr, buffer_size));
1684 else if (strcasecmp (command, "batch") == 0 && sock != NULL)
1685 return batch_start(sock);
1686 else if (strcasecmp (command, ".") == 0 && sock != NULL && sock->batch_start)
1687 return batch_done(sock);
1688 else if (strcasecmp (command, "quit") == 0)
1691 return send_response(sock, RESP_ERR, "Unknown command: %s\n", command);
1695 } /* }}} int handle_request */
1697 /* MUST NOT hold journal_lock before calling this */
1698 static void journal_rotate(void) /* {{{ */
1700 FILE *old_fh = NULL;
1703 if (journal_cur == NULL || journal_old == NULL)
1706 pthread_mutex_lock(&journal_lock);
1708 /* we rotate this way (rename before close) so that the we can release
1709 * the journal lock as fast as possible. Journal writes to the new
1710 * journal can proceed immediately after the new file is opened. The
1711 * fclose can then block without affecting new updates.
1713 if (journal_fh != NULL)
1715 old_fh = journal_fh;
1717 rename(journal_cur, journal_old);
1718 ++stats_journal_rotate;
1721 new_fd = open(journal_cur, O_WRONLY|O_CREAT|O_APPEND,
1722 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
1725 journal_fh = fdopen(new_fd, "a");
1726 if (journal_fh == NULL)
1730 pthread_mutex_unlock(&journal_lock);
1735 if (journal_fh == NULL)
1738 "JOURNALING DISABLED: Cannot open journal file '%s' : (%s)",
1739 journal_cur, rrd_strerror(errno));
1742 "JOURNALING DISABLED: All values will be flushed at shutdown");
1743 config_flush_at_shutdown = 1;
1746 } /* }}} static void journal_rotate */
1748 static void journal_done(void) /* {{{ */
1750 if (journal_cur == NULL)
1753 pthread_mutex_lock(&journal_lock);
1754 if (journal_fh != NULL)
1760 if (config_flush_at_shutdown)
1762 RRDD_LOG(LOG_INFO, "removing journals");
1763 unlink(journal_old);
1764 unlink(journal_cur);
1768 RRDD_LOG(LOG_INFO, "expedited shutdown; "
1769 "journals will be used at next startup");
1772 pthread_mutex_unlock(&journal_lock);
1774 } /* }}} static void journal_done */
1776 static int journal_write(char *cmd, char *args) /* {{{ */
1780 if (journal_fh == NULL)
1783 pthread_mutex_lock(&journal_lock);
1784 chars = fprintf(journal_fh, "%s %s\n", cmd, args);
1785 pthread_mutex_unlock(&journal_lock);
1789 pthread_mutex_lock(&stats_lock);
1790 stats_journal_bytes += chars;
1791 pthread_mutex_unlock(&stats_lock);
1795 } /* }}} static int journal_write */
1797 static int journal_replay (const char *file) /* {{{ */
1803 char entry[CMD_MAX];
1806 if (file == NULL) return 0;
1809 char *reason = "unknown error";
1811 struct stat statbuf;
1813 memset(&statbuf, 0, sizeof(statbuf));
1814 if (stat(file, &statbuf) != 0)
1816 if (errno == ENOENT)
1819 reason = "stat error";
1822 else if (!S_ISREG(statbuf.st_mode))
1824 reason = "not a regular file";
1827 if (statbuf.st_uid != daemon_uid)
1829 reason = "not owned by daemon user";
1832 if (statbuf.st_mode & (S_IWGRP|S_IWOTH))
1834 reason = "must not be user/group writable";
1840 RRDD_LOG(LOG_ERR, "journal_replay: %s : %s (%s)",
1841 file, rrd_strerror(status), reason);
1846 fh = fopen(file, "r");
1849 if (errno != ENOENT)
1850 RRDD_LOG(LOG_ERR, "journal_replay: cannot open journal file: '%s' (%s)",
1851 file, rrd_strerror(errno));
1855 RRDD_LOG(LOG_NOTICE, "replaying from journal: %s", file);
1864 if (fgets(entry, sizeof(entry), fh) == NULL)
1866 entry_len = strlen(entry);
1868 /* check \n termination in case journal writing crashed mid-line */
1871 else if (entry[entry_len - 1] != '\n')
1873 RRDD_LOG(LOG_NOTICE, "Malformed journal entry at line %"PRIu64, line);
1878 entry[entry_len - 1] = '\0';
1880 if (handle_request(NULL, now, entry, entry_len) == 0)
1888 RRDD_LOG(LOG_INFO, "Replayed %d entries (%d failures)",
1889 entry_cnt, fail_cnt);
1891 return entry_cnt > 0 ? 1 : 0;
1892 } /* }}} static int journal_replay */
1894 static void journal_init(void) /* {{{ */
1896 int had_journal = 0;
1898 if (journal_cur == NULL) return;
1900 pthread_mutex_lock(&journal_lock);
1902 RRDD_LOG(LOG_INFO, "checking for journal files");
1904 had_journal += journal_replay(journal_old);
1905 had_journal += journal_replay(journal_cur);
1907 /* it must have been a crash. start a flush */
1908 if (had_journal && config_flush_at_shutdown)
1909 flush_old_values(-1);
1911 pthread_mutex_unlock(&journal_lock);
1914 RRDD_LOG(LOG_INFO, "journal processing complete");
1916 } /* }}} static void journal_init */
1918 static void free_listen_socket(listen_socket_t *sock) /* {{{ */
1920 assert(sock != NULL);
1922 free(sock->rbuf); sock->rbuf = NULL;
1923 free(sock->wbuf); sock->wbuf = NULL;
1925 } /* }}} void free_listen_socket */
1927 static void close_connection(listen_socket_t *sock) /* {{{ */
1935 free_listen_socket(sock);
1937 } /* }}} void close_connection */
1939 static void *connection_thread_main (void *args) /* {{{ */
1941 listen_socket_t *sock;
1945 sock = (listen_socket_t *) args;
1948 /* init read buffers */
1949 sock->next_read = sock->next_cmd = 0;
1950 sock->rbuf = malloc(RBUF_SIZE);
1951 if (sock->rbuf == NULL)
1953 RRDD_LOG(LOG_ERR, "connection_thread_main: cannot malloc read buffer");
1954 close_connection(sock);
1958 pthread_mutex_lock (&connection_threads_lock);
1962 temp = (pthread_t *) rrd_realloc (connection_threads,
1963 sizeof (pthread_t) * (connection_threads_num + 1));
1966 RRDD_LOG (LOG_ERR, "connection_thread_main: realloc(++) failed.");
1970 connection_threads = temp;
1971 connection_threads[connection_threads_num] = pthread_self ();
1972 connection_threads_num++;
1975 pthread_mutex_unlock (&connection_threads_lock);
1977 while (do_shutdown == 0)
1984 struct pollfd pollfd;
1988 pollfd.events = POLLIN | POLLPRI;
1991 status = poll (&pollfd, 1, /* timeout = */ 500);
1994 else if (status == 0) /* timeout */
1996 else if (status < 0) /* error */
1999 if (status != EINTR)
2000 RRDD_LOG (LOG_ERR, "connection_thread_main: poll(2) failed.");
2004 if ((pollfd.revents & POLLHUP) != 0) /* normal shutdown */
2006 else if ((pollfd.revents & (POLLIN | POLLPRI)) == 0)
2008 RRDD_LOG (LOG_WARNING, "connection_thread_main: "
2009 "poll(2) returned something unexpected: %#04hx",
2014 rbytes = read(fd, sock->rbuf + sock->next_read,
2015 RBUF_SIZE - sock->next_read);
2018 RRDD_LOG(LOG_ERR, "connection_thread_main: read() failed.");
2021 else if (rbytes == 0)
2024 sock->next_read += rbytes;
2026 if (sock->batch_start)
2027 now = sock->batch_start;
2031 while ((cmd = next_cmd(sock, &cmd_len)) != NULL)
2033 status = handle_request (sock, now, cmd, cmd_len+1);
2040 close_connection(sock);
2042 /* Remove this thread from the connection threads list */
2043 pthread_mutex_lock (&connection_threads_lock);
2048 /* Find out own index in the array */
2049 self = pthread_self ();
2050 for (i = 0; i < connection_threads_num; i++)
2051 if (pthread_equal (connection_threads[i], self) != 0)
2053 assert (i < connection_threads_num);
2055 /* Move the trailing threads forward. */
2056 if (i < (connection_threads_num - 1))
2058 memmove (connection_threads + i,
2059 connection_threads + i + 1,
2060 sizeof (pthread_t) * (connection_threads_num - i - 1));
2063 connection_threads_num--;
2065 temp = rrd_realloc(connection_threads,
2066 sizeof(*connection_threads) * connection_threads_num);
2067 if (connection_threads_num > 0 && temp == NULL)
2068 RRDD_LOG(LOG_ERR, "connection_thread_main: realloc(--) failed.");
2070 connection_threads = temp;
2072 pthread_mutex_unlock (&connection_threads_lock);
2075 } /* }}} void *connection_thread_main */
2077 static int open_listen_socket_unix (const listen_socket_t *sock) /* {{{ */
2080 struct sockaddr_un sa;
2081 listen_socket_t *temp;
2086 if (strncmp(path, "unix:", strlen("unix:")) == 0)
2087 path += strlen("unix:");
2089 temp = (listen_socket_t *) rrd_realloc (listen_fds,
2090 sizeof (listen_fds[0]) * (listen_fds_num + 1));
2093 fprintf (stderr, "rrdcached: open_listen_socket_unix: realloc failed.\n");
2097 memcpy (listen_fds + listen_fds_num, sock, sizeof (listen_fds[0]));
2099 fd = socket (PF_UNIX, SOCK_STREAM, /* protocol = */ 0);
2102 fprintf (stderr, "rrdcached: unix socket(2) failed: %s\n",
2103 rrd_strerror(errno));
2107 memset (&sa, 0, sizeof (sa));
2108 sa.sun_family = AF_UNIX;
2109 strncpy (sa.sun_path, path, sizeof (sa.sun_path) - 1);
2111 /* if we've gotten this far, we own the pid file. any daemon started
2112 * with the same args must not be alive. therefore, ensure that we can
2113 * create the socket...
2117 status = bind (fd, (struct sockaddr *) &sa, sizeof (sa));
2120 fprintf (stderr, "rrdcached: bind(%s) failed: %s.\n",
2121 path, rrd_strerror(errno));
2126 status = listen (fd, /* backlog = */ 10);
2129 fprintf (stderr, "rrdcached: listen(%s) failed: %s.\n",
2130 path, rrd_strerror(errno));
2136 listen_fds[listen_fds_num].fd = fd;
2137 listen_fds[listen_fds_num].family = PF_UNIX;
2138 strncpy(listen_fds[listen_fds_num].addr, path,
2139 sizeof (listen_fds[listen_fds_num].addr) - 1);
2143 } /* }}} int open_listen_socket_unix */
2145 static int open_listen_socket_network(const listen_socket_t *sock) /* {{{ */
2147 struct addrinfo ai_hints;
2148 struct addrinfo *ai_res;
2149 struct addrinfo *ai_ptr;
2150 char addr_copy[NI_MAXHOST];
2155 strncpy (addr_copy, sock->addr, sizeof (addr_copy));
2156 addr_copy[sizeof (addr_copy) - 1] = 0;
2159 memset (&ai_hints, 0, sizeof (ai_hints));
2160 ai_hints.ai_flags = 0;
2161 #ifdef AI_ADDRCONFIG
2162 ai_hints.ai_flags |= AI_ADDRCONFIG;
2164 ai_hints.ai_family = AF_UNSPEC;
2165 ai_hints.ai_socktype = SOCK_STREAM;
2168 if (*addr == '[') /* IPv6+port format */
2170 /* `addr' is something like "[2001:780:104:2:211:24ff:feab:26f8]:12345" */
2173 port = strchr (addr, ']');
2176 fprintf (stderr, "rrdcached: Malformed address: %s\n", sock->addr);
2184 else if (*port == 0)
2188 fprintf (stderr, "rrdcached: Garbage after address: %s\n", port);
2191 } /* if (*addr = ']') */
2192 else if (strchr (addr, '.') != NULL) /* Hostname or IPv4 */
2194 port = rindex(addr, ':');
2202 status = getaddrinfo (addr,
2203 port == NULL ? RRDCACHED_DEFAULT_PORT : port,
2204 &ai_hints, &ai_res);
2207 fprintf (stderr, "rrdcached: getaddrinfo(%s) failed: %s\n",
2208 addr, gai_strerror (status));
2212 for (ai_ptr = ai_res; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
2215 listen_socket_t *temp;
2218 temp = (listen_socket_t *) rrd_realloc (listen_fds,
2219 sizeof (listen_fds[0]) * (listen_fds_num + 1));
2223 "rrdcached: open_listen_socket_network: realloc failed.\n");
2227 memcpy (listen_fds + listen_fds_num, sock, sizeof (listen_fds[0]));
2229 fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
2232 fprintf (stderr, "rrdcached: network socket(2) failed: %s.\n",
2233 rrd_strerror(errno));
2237 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
2239 status = bind (fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
2242 fprintf (stderr, "rrdcached: bind(%s) failed: %s.\n",
2243 sock->addr, rrd_strerror(errno));
2248 status = listen (fd, /* backlog = */ 10);
2251 fprintf (stderr, "rrdcached: listen(%s) failed: %s\n.",
2252 sock->addr, rrd_strerror(errno));
2254 freeaddrinfo(ai_res);
2258 listen_fds[listen_fds_num].fd = fd;
2259 listen_fds[listen_fds_num].family = ai_ptr->ai_family;
2261 } /* for (ai_ptr) */
2263 freeaddrinfo(ai_res);
2265 } /* }}} static int open_listen_socket_network */
2267 static int open_listen_socket (const listen_socket_t *sock) /* {{{ */
2269 assert(sock != NULL);
2270 assert(sock->addr != NULL);
2272 if (strncmp ("unix:", sock->addr, strlen ("unix:")) == 0
2273 || sock->addr[0] == '/')
2274 return (open_listen_socket_unix(sock));
2276 return (open_listen_socket_network(sock));
2277 } /* }}} int open_listen_socket */
2279 static int close_listen_sockets (void) /* {{{ */
2283 for (i = 0; i < listen_fds_num; i++)
2285 close (listen_fds[i].fd);
2287 if (listen_fds[i].family == PF_UNIX)
2288 unlink(listen_fds[i].addr);
2296 } /* }}} int close_listen_sockets */
2298 static void *listen_thread_main (void *args __attribute__((unused))) /* {{{ */
2300 struct pollfd *pollfds;
2305 if (listen_fds_num < 1)
2307 RRDD_LOG(LOG_ERR, "listen_thread_main: no listen_fds !");
2311 pollfds_num = listen_fds_num;
2312 pollfds = (struct pollfd *) malloc (sizeof (*pollfds) * pollfds_num);
2313 if (pollfds == NULL)
2315 RRDD_LOG (LOG_ERR, "listen_thread_main: malloc failed.");
2318 memset (pollfds, 0, sizeof (*pollfds) * pollfds_num);
2320 RRDD_LOG(LOG_INFO, "listening for connections");
2322 while (do_shutdown == 0)
2324 for (i = 0; i < pollfds_num; i++)
2326 pollfds[i].fd = listen_fds[i].fd;
2327 pollfds[i].events = POLLIN | POLLPRI;
2328 pollfds[i].revents = 0;
2331 status = poll (pollfds, pollfds_num, /* timeout = */ 1000);
2334 else if (status == 0) /* timeout */
2336 else if (status < 0) /* error */
2339 if (status != EINTR)
2341 RRDD_LOG (LOG_ERR, "listen_thread_main: poll(2) failed.");
2346 for (i = 0; i < pollfds_num; i++)
2348 listen_socket_t *client_sock;
2349 struct sockaddr_storage client_sa;
2350 socklen_t client_sa_size;
2352 pthread_attr_t attr;
2354 if (pollfds[i].revents == 0)
2357 if ((pollfds[i].revents & (POLLIN | POLLPRI)) == 0)
2359 RRDD_LOG (LOG_ERR, "listen_thread_main: "
2360 "poll(2) returned something unexpected for listen FD #%i.",
2365 client_sock = (listen_socket_t *) malloc (sizeof (listen_socket_t));
2366 if (client_sock == NULL)
2368 RRDD_LOG (LOG_ERR, "listen_thread_main: malloc failed.");
2371 memcpy(client_sock, &listen_fds[i], sizeof(listen_fds[0]));
2373 client_sa_size = sizeof (client_sa);
2374 client_sock->fd = accept (pollfds[i].fd,
2375 (struct sockaddr *) &client_sa, &client_sa_size);
2376 if (client_sock->fd < 0)
2378 RRDD_LOG (LOG_ERR, "listen_thread_main: accept(2) failed.");
2383 pthread_attr_init (&attr);
2384 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
2386 status = pthread_create (&tid, &attr, connection_thread_main,
2390 RRDD_LOG (LOG_ERR, "listen_thread_main: pthread_create failed.");
2391 close_connection(client_sock);
2394 } /* for (pollfds_num) */
2395 } /* while (do_shutdown == 0) */
2397 RRDD_LOG(LOG_INFO, "starting shutdown");
2399 close_listen_sockets ();
2401 pthread_mutex_lock (&connection_threads_lock);
2402 while (connection_threads_num > 0)
2406 wait_for = connection_threads[0];
2408 pthread_mutex_unlock (&connection_threads_lock);
2409 pthread_join (wait_for, /* retval = */ NULL);
2410 pthread_mutex_lock (&connection_threads_lock);
2412 pthread_mutex_unlock (&connection_threads_lock);
2417 } /* }}} void *listen_thread_main */
2419 static int daemonize (void) /* {{{ */
2424 daemon_uid = geteuid();
2426 pid_fd = open_pidfile("create", O_CREAT|O_EXCL|O_WRONLY);
2428 pid_fd = check_pidfile();
2432 /* open all the listen sockets */
2433 if (config_listen_address_list_len > 0)
2435 for (int i = 0; i < config_listen_address_list_len; i++)
2437 open_listen_socket (config_listen_address_list[i]);
2438 free_listen_socket (config_listen_address_list[i]);
2441 free(config_listen_address_list);
2445 listen_socket_t sock;
2446 memset(&sock, 0, sizeof(sock));
2447 strncpy(sock.addr, RRDCACHED_DEFAULT_ADDRESS, sizeof(sock.addr));
2448 open_listen_socket (&sock);
2451 if (listen_fds_num < 1)
2453 fprintf (stderr, "rrdcached: FATAL: cannot open any listen sockets\n");
2457 if (!stay_foreground)
2464 fprintf (stderr, "daemonize: fork(2) failed.\n");
2470 /* Become session leader */
2473 /* Open the first three file descriptors to /dev/null */
2478 open ("/dev/null", O_RDWR);
2481 } /* if (!stay_foreground) */
2483 /* Change into the /tmp directory. */
2484 base_dir = (config_base_dir != NULL)
2488 if (chdir (base_dir) != 0)
2490 fprintf (stderr, "daemonize: chdir (%s) failed.\n", base_dir);
2494 install_signal_handlers();
2496 openlog ("rrdcached", LOG_PID, LOG_DAEMON);
2497 RRDD_LOG(LOG_INFO, "starting up");
2499 cache_tree = g_tree_new_full ((GCompareDataFunc) strcmp, NULL, NULL,
2500 (GDestroyNotify) free_cache_item);
2501 if (cache_tree == NULL)
2503 RRDD_LOG (LOG_ERR, "daemonize: g_tree_new failed.");
2507 return write_pidfile (pid_fd);
2512 } /* }}} int daemonize */
2514 static int cleanup (void) /* {{{ */
2518 pthread_cond_signal (&cache_cond);
2519 pthread_join (queue_thread, /* return = */ NULL);
2523 free(config_base_dir);
2524 free(config_pid_file);
2528 pthread_mutex_lock(&cache_lock);
2529 g_tree_destroy(cache_tree);
2531 RRDD_LOG(LOG_INFO, "goodbye");
2535 } /* }}} int cleanup */
2537 static int read_options (int argc, char **argv) /* {{{ */
2542 while ((option = getopt(argc, argv, "gl:L:f:w:b:Bz:p:j:h?F")) != -1)
2553 listen_socket_t **temp;
2554 listen_socket_t *new;
2556 new = malloc(sizeof(listen_socket_t));
2559 fprintf(stderr, "read_options: malloc failed.\n");
2562 memset(new, 0, sizeof(listen_socket_t));
2564 temp = (listen_socket_t **) rrd_realloc (config_listen_address_list,
2565 sizeof (listen_socket_t *) * (config_listen_address_list_len + 1));
2568 fprintf (stderr, "read_options: realloc failed.\n");
2571 config_listen_address_list = temp;
2573 strncpy(new->addr, optarg, sizeof(new->addr)-1);
2574 new->privilege = (option == 'l') ? PRIV_HIGH : PRIV_LOW;
2576 temp[config_listen_address_list_len] = new;
2577 config_listen_address_list_len++;
2585 temp = atoi (optarg);
2587 config_flush_interval = temp;
2590 fprintf (stderr, "Invalid flush interval: %s\n", optarg);
2600 temp = atoi (optarg);
2602 config_write_interval = temp;
2605 fprintf (stderr, "Invalid write interval: %s\n", optarg);
2615 temp = atoi(optarg);
2617 config_write_jitter = temp;
2620 fprintf (stderr, "Invalid write jitter: -z %s\n", optarg);
2628 config_write_base_only = 1;
2634 char base_realpath[PATH_MAX];
2636 if (config_base_dir != NULL)
2637 free (config_base_dir);
2638 config_base_dir = strdup (optarg);
2639 if (config_base_dir == NULL)
2641 fprintf (stderr, "read_options: strdup failed.\n");
2645 /* make sure that the base directory is not resolved via
2646 * symbolic links. this makes some performance-enhancing
2647 * assumptions possible (we don't have to resolve paths
2648 * that start with a "/")
2650 if (realpath(config_base_dir, base_realpath) == NULL)
2652 fprintf (stderr, "Invalid base directory '%s'.\n", config_base_dir);
2655 else if (strncmp(config_base_dir,
2656 base_realpath, sizeof(base_realpath)) != 0)
2659 "Base directory (-b) resolved via file system links!\n"
2660 "Please consult rrdcached '-b' documentation!\n"
2661 "Consider specifying the real directory (%s)\n",
2666 len = strlen (config_base_dir);
2667 while ((len > 0) && (config_base_dir[len - 1] == '/'))
2669 config_base_dir[len - 1] = 0;
2675 fprintf (stderr, "Invalid base directory: %s\n", optarg);
2679 _config_base_dir_len = len;
2685 if (config_pid_file != NULL)
2686 free (config_pid_file);
2687 config_pid_file = strdup (optarg);
2688 if (config_pid_file == NULL)
2690 fprintf (stderr, "read_options: strdup failed.\n");
2697 config_flush_at_shutdown = 1;
2702 struct stat statbuf;
2703 const char *dir = optarg;
2705 status = stat(dir, &statbuf);
2708 fprintf(stderr, "Cannot stat '%s' : %s\n", dir, rrd_strerror(errno));
2712 if (!S_ISDIR(statbuf.st_mode)
2713 || access(dir, R_OK|W_OK|X_OK) != 0)
2715 fprintf(stderr, "Must specify a writable directory with -j! (%s)\n",
2716 errno ? rrd_strerror(errno) : "");
2720 journal_cur = malloc(PATH_MAX + 1);
2721 journal_old = malloc(PATH_MAX + 1);
2722 if (journal_cur == NULL || journal_old == NULL)
2724 fprintf(stderr, "malloc failure for journal files\n");
2729 snprintf(journal_cur, PATH_MAX, "%s/rrd.journal", dir);
2730 snprintf(journal_old, PATH_MAX, "%s/rrd.journal.old", dir);
2737 printf ("RRDCacheD %s Copyright (C) 2008 Florian octo Forster\n"
2739 "Usage: rrdcached [options]\n"
2741 "Valid options are:\n"
2742 " -l <address> Socket address to listen to.\n"
2743 " -L <address> Socket address to listen to ('FLUSH' only).\n"
2744 " -w <seconds> Interval in which to write data.\n"
2745 " -z <delay> Delay writes up to <delay> seconds to spread load\n"
2746 " -f <seconds> Interval in which to flush dead data.\n"
2747 " -p <file> Location of the PID-file.\n"
2748 " -b <dir> Base directory to change to.\n"
2749 " -B Restrict file access to paths within -b <dir>\n"
2750 " -g Do not fork and run in the foreground.\n"
2751 " -j <dir> Directory in which to create the journal files.\n"
2752 " -F Always flush all updates at shutdown\n"
2754 "For more information and a detailed description of all options "
2756 "to the rrdcached(1) manual page.\n",
2760 } /* switch (option) */
2761 } /* while (getopt) */
2763 /* advise the user when values are not sane */
2764 if (config_flush_interval < 2 * config_write_interval)
2765 fprintf(stderr, "WARNING: flush interval (-f) should be at least"
2766 " 2x write interval (-w) !\n");
2767 if (config_write_jitter > config_write_interval)
2768 fprintf(stderr, "WARNING: write delay (-z) should NOT be larger than"
2769 " write interval (-w) !\n");
2771 if (config_write_base_only && config_base_dir == NULL)
2772 fprintf(stderr, "WARNING: -B does not make sense without -b!\n"
2773 " Consult the rrdcached documentation\n");
2775 if (journal_cur == NULL)
2776 config_flush_at_shutdown = 1;
2779 } /* }}} int read_options */
2781 int main (int argc, char **argv)
2785 status = read_options (argc, argv);
2793 status = daemonize ();
2796 fprintf (stderr, "rrdcached: daemonize failed, exiting.\n");
2802 /* start the queue thread */
2803 memset (&queue_thread, 0, sizeof (queue_thread));
2804 status = pthread_create (&queue_thread,
2810 RRDD_LOG (LOG_ERR, "FATAL: cannot create queue thread");
2815 listen_thread_main (NULL);
2822 * vim: set sw=2 sts=2 ts=8 et fdm=marker :