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..
65 #include "rrd.h" /* {{{ */
66 #include "rrd_client.h"
77 #include <sys/types.h>
81 #include <sys/socket.h>
92 #include <glib-2.0/glib.h>
95 #define RRDD_LOG(severity, ...) syslog ((severity), __VA_ARGS__)
98 # define __attribute__(x) /**/
110 typedef enum { RESP_ERR = -1, RESP_OK = 0 } response_code;
112 struct listen_socket_s
115 char addr[PATH_MAX + 1];
117 socket_privilege privilege;
119 /* state for BATCH processing */
131 typedef struct listen_socket_s listen_socket_t;
134 typedef struct cache_item_s cache_item_t;
140 time_t last_flush_time;
141 #define CI_FLAGS_IN_TREE (1<<0)
142 #define CI_FLAGS_IN_QUEUE (1<<1)
144 pthread_cond_t flushed;
149 struct callback_flush_data_s
156 typedef struct callback_flush_data_s callback_flush_data_t;
163 typedef enum queue_side_e queue_side_t;
165 /* max length of socket command or response */
167 #define RBUF_SIZE (CMD_MAX*2)
172 static int stay_foreground = 0;
173 static uid_t daemon_uid;
175 static listen_socket_t *listen_fds = NULL;
176 static size_t listen_fds_num = 0;
178 static int do_shutdown = 0;
180 static pthread_t queue_thread;
182 static pthread_t *connection_threads = NULL;
183 static pthread_mutex_t connection_threads_lock = PTHREAD_MUTEX_INITIALIZER;
184 static int connection_threads_num = 0;
187 static GTree *cache_tree = NULL;
188 static cache_item_t *cache_queue_head = NULL;
189 static cache_item_t *cache_queue_tail = NULL;
190 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
191 static pthread_cond_t cache_cond = PTHREAD_COND_INITIALIZER;
193 static int config_write_interval = 300;
194 static int config_write_jitter = 0;
195 static int config_flush_interval = 3600;
196 static int config_flush_at_shutdown = 0;
197 static char *config_pid_file = NULL;
198 static char *config_base_dir = NULL;
199 static size_t _config_base_dir_len = 0;
200 static int config_write_base_only = 0;
202 static listen_socket_t **config_listen_address_list = NULL;
203 static int config_listen_address_list_len = 0;
205 static uint64_t stats_queue_length = 0;
206 static uint64_t stats_updates_received = 0;
207 static uint64_t stats_flush_received = 0;
208 static uint64_t stats_updates_written = 0;
209 static uint64_t stats_data_sets_written = 0;
210 static uint64_t stats_journal_bytes = 0;
211 static uint64_t stats_journal_rotate = 0;
212 static pthread_mutex_t stats_lock = PTHREAD_MUTEX_INITIALIZER;
214 /* Journaled updates */
215 static char *journal_cur = NULL;
216 static char *journal_old = NULL;
217 static FILE *journal_fh = NULL;
218 static pthread_mutex_t journal_lock = PTHREAD_MUTEX_INITIALIZER;
219 static int journal_write(char *cmd, char *args);
220 static void journal_done(void);
221 static void journal_rotate(void);
226 static void sig_common (const char *sig) /* {{{ */
228 RRDD_LOG(LOG_NOTICE, "caught SIG%s", sig);
230 pthread_cond_broadcast(&cache_cond);
231 } /* }}} void sig_common */
233 static void sig_int_handler (int s __attribute__((unused))) /* {{{ */
236 } /* }}} void sig_int_handler */
238 static void sig_term_handler (int s __attribute__((unused))) /* {{{ */
241 } /* }}} void sig_term_handler */
243 static void sig_usr1_handler (int s __attribute__((unused))) /* {{{ */
245 config_flush_at_shutdown = 1;
247 } /* }}} void sig_usr1_handler */
249 static void sig_usr2_handler (int s __attribute__((unused))) /* {{{ */
251 config_flush_at_shutdown = 0;
253 } /* }}} void sig_usr2_handler */
255 static void install_signal_handlers(void) /* {{{ */
257 /* These structures are static, because `sigaction' behaves weird if the are
259 static struct sigaction sa_int;
260 static struct sigaction sa_term;
261 static struct sigaction sa_pipe;
262 static struct sigaction sa_usr1;
263 static struct sigaction sa_usr2;
265 /* Install signal handlers */
266 memset (&sa_int, 0, sizeof (sa_int));
267 sa_int.sa_handler = sig_int_handler;
268 sigaction (SIGINT, &sa_int, NULL);
270 memset (&sa_term, 0, sizeof (sa_term));
271 sa_term.sa_handler = sig_term_handler;
272 sigaction (SIGTERM, &sa_term, NULL);
274 memset (&sa_pipe, 0, sizeof (sa_pipe));
275 sa_pipe.sa_handler = SIG_IGN;
276 sigaction (SIGPIPE, &sa_pipe, NULL);
278 memset (&sa_pipe, 0, sizeof (sa_usr1));
279 sa_usr1.sa_handler = sig_usr1_handler;
280 sigaction (SIGUSR1, &sa_usr1, NULL);
282 memset (&sa_usr2, 0, sizeof (sa_usr2));
283 sa_usr2.sa_handler = sig_usr2_handler;
284 sigaction (SIGUSR2, &sa_usr2, NULL);
286 } /* }}} void install_signal_handlers */
288 static int open_pidfile(void) /* {{{ */
293 file = (config_pid_file != NULL)
295 : LOCALSTATEDIR "/run/rrdcached.pid";
297 fd = open(file, O_CREAT|O_EXCL|O_WRONLY, S_IRUSR|S_IRGRP|S_IROTH);
299 fprintf(stderr, "FATAL: cannot create '%s' (%s)\n",
300 file, rrd_strerror(errno));
303 } /* }}} static int open_pidfile */
305 static int write_pidfile (int fd) /* {{{ */
312 fh = fdopen (fd, "w");
315 RRDD_LOG (LOG_ERR, "write_pidfile: fdopen() failed.");
320 fprintf (fh, "%i\n", (int) pid);
324 } /* }}} int write_pidfile */
326 static int remove_pidfile (void) /* {{{ */
331 file = (config_pid_file != NULL)
333 : LOCALSTATEDIR "/run/rrdcached.pid";
335 status = unlink (file);
339 } /* }}} int remove_pidfile */
341 static char *next_cmd (listen_socket_t *sock, ssize_t *len) /* {{{ */
345 eol = memchr(sock->rbuf + sock->next_cmd, '\n',
346 sock->next_read - sock->next_cmd);
350 /* no commands left, move remainder back to front of rbuf */
351 memmove(sock->rbuf, sock->rbuf + sock->next_cmd,
352 sock->next_read - sock->next_cmd);
353 sock->next_read -= sock->next_cmd;
360 char *cmd = sock->rbuf + sock->next_cmd;
363 sock->next_cmd = eol - sock->rbuf + 1;
365 if (eol > sock->rbuf && *(eol-1) == '\r')
366 *(--eol) = '\0'; /* handle "\r\n" EOL */
377 /* add the characters directly to the write buffer */
378 static int add_to_wbuf(listen_socket_t *sock, char *str, size_t len) /* {{{ */
382 assert(sock != NULL);
384 new_buf = realloc(sock->wbuf, sock->wbuf_len + len + 1);
387 RRDD_LOG(LOG_ERR, "add_to_wbuf: realloc failed");
391 strncpy(new_buf + sock->wbuf_len, str, len + 1);
393 sock->wbuf = new_buf;
394 sock->wbuf_len += len;
397 } /* }}} static int add_to_wbuf */
399 /* add the text to the "extra" info that's sent after the status line */
400 static int add_response_info(listen_socket_t *sock, char *fmt, ...) /* {{{ */
403 char buffer[CMD_MAX];
406 if (sock == NULL) return 0; /* journal replay mode */
407 if (sock->batch_mode) return 0; /* no extra info returned when in BATCH */
410 #ifdef HAVE_VSNPRINTF
411 len = vsnprintf(buffer, sizeof(buffer)-1, fmt, argp);
413 len = vsprintf(buffer, fmt, argp);
418 RRDD_LOG(LOG_ERR, "add_response_info: vnsprintf failed");
422 return add_to_wbuf(sock, buffer, len);
423 } /* }}} static int add_response_info */
425 static int count_lines(char *str) /* {{{ */
431 while ((str = strchr(str, '\n')) != NULL)
439 } /* }}} static int count_lines */
441 /* send the response back to the user.
442 * returns 0 on success, -1 on error
443 * write buffer is always zeroed after this call */
444 static int send_response (listen_socket_t *sock, response_code rc,
445 char *fmt, ...) /* {{{ */
448 char buffer[CMD_MAX];
453 if (sock == NULL) return rc; /* journal replay mode */
455 if (sock->batch_mode)
458 return rc; /* no response on success during BATCH */
459 lines = sock->batch_cmd;
461 else if (rc == RESP_OK)
462 lines = count_lines(sock->wbuf);
466 rclen = sprintf(buffer, "%d ", lines);
468 #ifdef HAVE_VSNPRINTF
469 len = vsnprintf(buffer+rclen, sizeof(buffer)-rclen-1, fmt, argp);
471 len = vsprintf(buffer+rclen, fmt, argp);
479 /* append the result to the wbuf, don't write to the user */
480 if (sock->batch_mode)
481 return add_to_wbuf(sock, buffer, len);
483 /* first write must be complete */
484 if (len != write(sock->fd, buffer, len))
486 RRDD_LOG(LOG_INFO, "send_response: could not write status message");
490 if (sock->wbuf != NULL)
493 while (wrote < sock->wbuf_len)
495 ssize_t wb = write(sock->fd, sock->wbuf + wrote, sock->wbuf_len - wrote);
498 RRDD_LOG(LOG_INFO, "send_response: could not write results");
505 free(sock->wbuf); sock->wbuf = NULL;
511 static void wipe_ci_values(cache_item_t *ci, time_t when)
516 ci->last_flush_time = when;
517 if (config_write_jitter > 0)
518 ci->last_flush_time += (random() % config_write_jitter);
522 * remove a "cache_item_t" item from the queue.
523 * must hold 'cache_lock' when calling this
525 static void remove_from_queue(cache_item_t *ci) /* {{{ */
527 if (ci == NULL) return;
529 if (ci->prev == NULL)
530 cache_queue_head = ci->next; /* reset head */
532 ci->prev->next = ci->next;
534 if (ci->next == NULL)
535 cache_queue_tail = ci->prev; /* reset the tail */
537 ci->next->prev = ci->prev;
539 ci->next = ci->prev = NULL;
540 ci->flags &= ~CI_FLAGS_IN_QUEUE;
541 } /* }}} static void remove_from_queue */
544 * enqueue_cache_item:
545 * `cache_lock' must be acquired before calling this function!
547 static int enqueue_cache_item (cache_item_t *ci, /* {{{ */
553 if (ci->values_num == 0)
558 if (cache_queue_head == ci)
561 /* remove from the double linked list */
562 if (ci->flags & CI_FLAGS_IN_QUEUE)
563 remove_from_queue(ci);
566 ci->next = cache_queue_head;
567 if (ci->next != NULL)
569 cache_queue_head = ci;
571 if (cache_queue_tail == NULL)
572 cache_queue_tail = cache_queue_head;
574 else /* (side == TAIL) */
576 /* We don't move values back in the list.. */
577 if (ci->flags & CI_FLAGS_IN_QUEUE)
580 assert (ci->next == NULL);
581 assert (ci->prev == NULL);
583 ci->prev = cache_queue_tail;
585 if (cache_queue_tail == NULL)
586 cache_queue_head = ci;
588 cache_queue_tail->next = ci;
590 cache_queue_tail = ci;
593 ci->flags |= CI_FLAGS_IN_QUEUE;
595 pthread_cond_broadcast(&cache_cond);
596 pthread_mutex_lock (&stats_lock);
597 stats_queue_length++;
598 pthread_mutex_unlock (&stats_lock);
601 } /* }}} int enqueue_cache_item */
604 * tree_callback_flush:
605 * Called via `g_tree_foreach' in `queue_thread_main'. `cache_lock' is held
606 * while this is in progress.
608 static gboolean tree_callback_flush (gpointer key, gpointer value, /* {{{ */
612 callback_flush_data_t *cfd;
614 ci = (cache_item_t *) value;
615 cfd = (callback_flush_data_t *) data;
617 if ((ci->last_flush_time <= cfd->abs_timeout)
618 && ((ci->flags & CI_FLAGS_IN_QUEUE) == 0)
619 && (ci->values_num > 0))
621 enqueue_cache_item (ci, TAIL);
623 else if ((do_shutdown != 0)
624 && ((ci->flags & CI_FLAGS_IN_QUEUE) == 0)
625 && (ci->values_num > 0))
627 enqueue_cache_item (ci, TAIL);
629 else if (((cfd->now - ci->last_flush_time) >= config_flush_interval)
630 && ((ci->flags & CI_FLAGS_IN_QUEUE) == 0)
631 && (ci->values_num <= 0))
635 temp = (char **) realloc (cfd->keys,
636 sizeof (char *) * (cfd->keys_num + 1));
639 RRDD_LOG (LOG_ERR, "tree_callback_flush: realloc failed.");
643 /* Make really sure this points to the _same_ place */
644 assert ((char *) key == ci->file);
645 cfd->keys[cfd->keys_num] = (char *) key;
650 } /* }}} gboolean tree_callback_flush */
652 static int flush_old_values (int max_age)
654 callback_flush_data_t cfd;
657 memset (&cfd, 0, sizeof (cfd));
658 /* Pass the current time as user data so that we don't need to call
659 * `time' for each node. */
660 cfd.now = time (NULL);
665 cfd.abs_timeout = cfd.now - max_age;
667 cfd.abs_timeout = cfd.now + 2*config_write_jitter + 1;
669 /* `tree_callback_flush' will return the keys of all values that haven't
670 * been touched in the last `config_flush_interval' seconds in `cfd'.
671 * The char*'s in this array point to the same memory as ci->file, so we
672 * don't need to free them separately. */
673 g_tree_foreach (cache_tree, tree_callback_flush, (gpointer) &cfd);
675 for (k = 0; k < cfd.keys_num; k++)
679 /* This must not fail. */
680 ci = (cache_item_t *) g_tree_lookup (cache_tree, cfd.keys[k]);
683 /* If we end up here with values available, something's seriously
685 assert (ci->values_num == 0);
687 /* Remove the node from the tree */
688 g_tree_remove (cache_tree, cfd.keys[k]);
691 /* Now free and clean up `ci'. */
696 } /* for (k = 0; k < cfd.keys_num; k++) */
698 if (cfd.keys != NULL)
705 } /* int flush_old_values */
707 static void *queue_thread_main (void *args __attribute__((unused))) /* {{{ */
710 struct timespec next_flush;
711 int final_flush = 0; /* make sure we only flush once on shutdown */
713 gettimeofday (&now, NULL);
714 next_flush.tv_sec = now.tv_sec + config_flush_interval;
715 next_flush.tv_nsec = 1000 * now.tv_usec;
717 pthread_mutex_lock (&cache_lock);
718 while ((do_shutdown == 0) || (cache_queue_head != NULL))
727 /* First, check if it's time to do the cache flush. */
728 gettimeofday (&now, NULL);
729 if ((now.tv_sec > next_flush.tv_sec)
730 || ((now.tv_sec == next_flush.tv_sec)
731 && ((1000 * now.tv_usec) > next_flush.tv_nsec)))
733 /* Flush all values that haven't been written in the last
734 * `config_write_interval' seconds. */
735 flush_old_values (config_write_interval);
737 /* Determine the time of the next cache flush. */
738 while (next_flush.tv_sec <= now.tv_sec)
739 next_flush.tv_sec += config_flush_interval;
741 /* unlock the cache while we rotate so we don't block incoming
742 * updates if the fsync() blocks on disk I/O */
743 pthread_mutex_unlock(&cache_lock);
745 pthread_mutex_lock(&cache_lock);
748 /* Now, check if there's something to store away. If not, wait until
749 * something comes in or it's time to do the cache flush. if we are
750 * shutting down, do not wait around. */
751 if (cache_queue_head == NULL && !do_shutdown)
753 status = pthread_cond_timedwait (&cache_cond, &cache_lock, &next_flush);
754 if ((status != 0) && (status != ETIMEDOUT))
756 RRDD_LOG (LOG_ERR, "queue_thread_main: "
757 "pthread_cond_timedwait returned %i.", status);
761 /* We're about to shut down */
762 if (do_shutdown != 0 && !final_flush++)
764 if (config_flush_at_shutdown)
765 flush_old_values (-1); /* flush everything */
770 /* Check if a value has arrived. This may be NULL if we timed out or there
771 * was an interrupt such as a signal. */
772 if (cache_queue_head == NULL)
775 ci = cache_queue_head;
777 /* copy the relevant parts */
778 file = strdup (ci->file);
781 RRDD_LOG (LOG_ERR, "queue_thread_main: strdup failed.");
785 assert(ci->values != NULL);
786 assert(ci->values_num > 0);
789 values_num = ci->values_num;
791 wipe_ci_values(ci, time(NULL));
792 remove_from_queue(ci);
794 pthread_mutex_lock (&stats_lock);
795 assert (stats_queue_length > 0);
796 stats_queue_length--;
797 pthread_mutex_unlock (&stats_lock);
799 pthread_mutex_unlock (&cache_lock);
802 status = rrd_update_r (file, NULL, values_num, (void *) values);
805 RRDD_LOG (LOG_NOTICE, "queue_thread_main: "
806 "rrd_update_r (%s) failed with status %i. (%s)",
807 file, status, rrd_get_error());
810 journal_write("wrote", file);
811 pthread_cond_broadcast(&ci->flushed);
813 for (i = 0; i < values_num; i++)
821 pthread_mutex_lock (&stats_lock);
822 stats_updates_written++;
823 stats_data_sets_written += values_num;
824 pthread_mutex_unlock (&stats_lock);
827 pthread_mutex_lock (&cache_lock);
829 /* We're about to shut down */
830 if (do_shutdown != 0 && !final_flush++)
832 if (config_flush_at_shutdown)
833 flush_old_values (-1); /* flush everything */
837 } /* while ((do_shutdown == 0) || (cache_queue_head != NULL)) */
838 pthread_mutex_unlock (&cache_lock);
840 if (config_flush_at_shutdown)
842 assert(cache_queue_head == NULL);
843 RRDD_LOG(LOG_INFO, "clean shutdown; all RRDs flushed");
849 } /* }}} void *queue_thread_main */
851 static int buffer_get_field (char **buffer_ret, /* {{{ */
852 size_t *buffer_size_ret, char **field_ret)
861 buffer = *buffer_ret;
863 buffer_size = *buffer_size_ret;
867 if (buffer_size <= 0)
870 /* This is ensured by `handle_request'. */
871 assert (buffer[buffer_size - 1] == '\0');
874 while (buffer_pos < buffer_size)
876 /* Check for end-of-field or end-of-buffer */
877 if (buffer[buffer_pos] == ' ' || buffer[buffer_pos] == '\0')
879 field[field_size] = 0;
885 /* Handle escaped characters. */
886 else if (buffer[buffer_pos] == '\\')
888 if (buffer_pos >= (buffer_size - 1))
891 field[field_size] = buffer[buffer_pos];
895 /* Normal operation */
898 field[field_size] = buffer[buffer_pos];
902 } /* while (buffer_pos < buffer_size) */
907 *buffer_ret = buffer + buffer_pos;
908 *buffer_size_ret = buffer_size - buffer_pos;
912 } /* }}} int buffer_get_field */
914 /* if we're restricting writes to the base directory,
915 * check whether the file falls within the dir
916 * returns 1 if OK, otherwise 0
918 static int check_file_access (const char *file, listen_socket_t *sock) /* {{{ */
920 assert(file != NULL);
922 if (!config_write_base_only
923 || sock == NULL /* journal replay */
924 || config_base_dir == NULL)
927 if (strstr(file, "../") != NULL) goto err;
929 /* relative paths without "../" are ok */
930 if (*file != '/') return 1;
932 /* file must be of the format base + "/" + <1+ char filename> */
933 if (strlen(file) < _config_base_dir_len + 2) goto err;
934 if (strncmp(file, config_base_dir, _config_base_dir_len) != 0) goto err;
935 if (*(file + _config_base_dir_len) != '/') goto err;
940 if (sock != NULL && sock->fd >= 0)
941 send_response(sock, RESP_ERR, "%s\n", rrd_strerror(EACCES));
944 } /* }}} static int check_file_access */
946 static int flush_file (const char *filename) /* {{{ */
950 pthread_mutex_lock (&cache_lock);
952 ci = (cache_item_t *) g_tree_lookup (cache_tree, filename);
955 pthread_mutex_unlock (&cache_lock);
959 if (ci->values_num > 0)
961 /* Enqueue at head */
962 enqueue_cache_item (ci, HEAD);
963 pthread_cond_wait(&ci->flushed, &cache_lock);
966 pthread_mutex_unlock(&cache_lock);
969 } /* }}} int flush_file */
971 static int handle_request_help (listen_socket_t *sock, /* {{{ */
972 char *buffer, size_t buffer_size)
985 "UPDATE <filename> <values> [<values> ...]\n"
990 char *help_flush[2] =
994 "Usage: FLUSH <filename>\n"
996 "Adds the given filename to the head of the update queue and returns\n"
997 "after is has been dequeued.\n"
1000 char *help_flushall[2] =
1002 "Help for FLUSHALL\n"
1006 "Triggers writing of all pending updates. Returns immediately.\n"
1009 char *help_update[2] =
1013 "Usage: UPDATE <filename> <values> [<values> ...]\n"
1015 "Adds the given file to the internal cache if it is not yet known and\n"
1016 "appends the given value(s) to the entry. See the rrdcached(1) manpage\n"
1019 "Each <values> has the following form:\n"
1020 " <values> = <time>:<value>[:<value>[...]]\n"
1021 "See the rrdupdate(1) manpage for details.\n"
1024 char *help_stats[2] =
1030 "Returns some performance counters, see the rrdcached(1) manpage for\n"
1031 "a description of the values.\n"
1034 char *help_batch[2] =
1038 "The 'BATCH' command permits the client to initiate a bulk load\n"
1039 " of commands to rrdcached.\n"
1044 " server: 0 Go ahead. End with dot '.' on its own line.\n"
1045 " client: command #1\n"
1046 " client: command #2\n"
1047 " client: ... and so on\n"
1049 " server: 2 errors\n"
1050 " server: 7 message for command #7\n"
1051 " server: 9 message for command #9\n"
1053 "For more information, consult the rrdcached(1) documentation.\n"
1056 status = buffer_get_field (&buffer, &buffer_size, &command);
1058 help_text = help_help;
1061 if (strcasecmp (command, "update") == 0)
1062 help_text = help_update;
1063 else if (strcasecmp (command, "flush") == 0)
1064 help_text = help_flush;
1065 else if (strcasecmp (command, "flushall") == 0)
1066 help_text = help_flushall;
1067 else if (strcasecmp (command, "stats") == 0)
1068 help_text = help_stats;
1069 else if (strcasecmp (command, "batch") == 0)
1070 help_text = help_batch;
1072 help_text = help_help;
1075 add_response_info(sock, help_text[1]);
1076 return send_response(sock, RESP_OK, help_text[0]);
1077 } /* }}} int handle_request_help */
1079 static int handle_request_stats (listen_socket_t *sock) /* {{{ */
1081 uint64_t copy_queue_length;
1082 uint64_t copy_updates_received;
1083 uint64_t copy_flush_received;
1084 uint64_t copy_updates_written;
1085 uint64_t copy_data_sets_written;
1086 uint64_t copy_journal_bytes;
1087 uint64_t copy_journal_rotate;
1089 uint64_t tree_nodes_number;
1090 uint64_t tree_depth;
1092 pthread_mutex_lock (&stats_lock);
1093 copy_queue_length = stats_queue_length;
1094 copy_updates_received = stats_updates_received;
1095 copy_flush_received = stats_flush_received;
1096 copy_updates_written = stats_updates_written;
1097 copy_data_sets_written = stats_data_sets_written;
1098 copy_journal_bytes = stats_journal_bytes;
1099 copy_journal_rotate = stats_journal_rotate;
1100 pthread_mutex_unlock (&stats_lock);
1102 pthread_mutex_lock (&cache_lock);
1103 tree_nodes_number = (uint64_t) g_tree_nnodes (cache_tree);
1104 tree_depth = (uint64_t) g_tree_height (cache_tree);
1105 pthread_mutex_unlock (&cache_lock);
1107 add_response_info(sock,
1108 "QueueLength: %"PRIu64"\n", copy_queue_length);
1109 add_response_info(sock,
1110 "UpdatesReceived: %"PRIu64"\n", copy_updates_received);
1111 add_response_info(sock,
1112 "FlushesReceived: %"PRIu64"\n", copy_flush_received);
1113 add_response_info(sock,
1114 "UpdatesWritten: %"PRIu64"\n", copy_updates_written);
1115 add_response_info(sock,
1116 "DataSetsWritten: %"PRIu64"\n", copy_data_sets_written);
1117 add_response_info(sock, "TreeNodesNumber: %"PRIu64"\n", tree_nodes_number);
1118 add_response_info(sock, "TreeDepth: %"PRIu64"\n", tree_depth);
1119 add_response_info(sock, "JournalBytes: %"PRIu64"\n", copy_journal_bytes);
1120 add_response_info(sock, "JournalRotate: %"PRIu64"\n", copy_journal_rotate);
1122 send_response(sock, RESP_OK, "Statistics follow\n");
1125 } /* }}} int handle_request_stats */
1127 static int handle_request_flush (listen_socket_t *sock, /* {{{ */
1128 char *buffer, size_t buffer_size)
1133 status = buffer_get_field (&buffer, &buffer_size, &file);
1136 return send_response(sock, RESP_ERR, "Usage: flush <filename>\n");
1140 pthread_mutex_lock(&stats_lock);
1141 stats_flush_received++;
1142 pthread_mutex_unlock(&stats_lock);
1144 if (!check_file_access(file, sock)) return 0;
1146 status = flush_file (file);
1148 return send_response(sock, RESP_OK, "Successfully flushed %s.\n", file);
1149 else if (status == ENOENT)
1151 /* no file in our tree; see whether it exists at all */
1152 struct stat statbuf;
1154 memset(&statbuf, 0, sizeof(statbuf));
1155 if (stat(file, &statbuf) == 0 && S_ISREG(statbuf.st_mode))
1156 return send_response(sock, RESP_OK, "Nothing to flush: %s.\n", file);
1158 return send_response(sock, RESP_ERR, "No such file: %s.\n", file);
1160 else if (status < 0)
1161 return send_response(sock, RESP_ERR, "Internal error.\n");
1163 return send_response(sock, RESP_ERR, "Failed with status %i.\n", status);
1168 } /* }}} int handle_request_slurp */
1170 static int handle_request_flushall(listen_socket_t *sock) /* {{{ */
1173 RRDD_LOG(LOG_DEBUG, "Received FLUSHALL");
1175 pthread_mutex_lock(&cache_lock);
1176 flush_old_values(-1);
1177 pthread_mutex_unlock(&cache_lock);
1179 return send_response(sock, RESP_OK, "Started flush.\n");
1180 } /* }}} static int handle_request_flushall */
1182 static int handle_request_update (listen_socket_t *sock, /* {{{ */
1183 char *buffer, size_t buffer_size)
1194 status = buffer_get_field (&buffer, &buffer_size, &file);
1196 return send_response(sock, RESP_ERR,
1197 "Usage: UPDATE <filename> <values> [<values> ...]\n");
1199 pthread_mutex_lock(&stats_lock);
1200 stats_updates_received++;
1201 pthread_mutex_unlock(&stats_lock);
1203 if (!check_file_access(file, sock)) return 0;
1205 pthread_mutex_lock (&cache_lock);
1206 ci = g_tree_lookup (cache_tree, file);
1208 if (ci == NULL) /* {{{ */
1210 struct stat statbuf;
1212 /* don't hold the lock while we setup; stat(2) might block */
1213 pthread_mutex_unlock(&cache_lock);
1215 memset (&statbuf, 0, sizeof (statbuf));
1216 status = stat (file, &statbuf);
1219 RRDD_LOG (LOG_NOTICE, "handle_request_update: stat (%s) failed.", file);
1222 if (status == ENOENT)
1223 return send_response(sock, RESP_ERR, "No such file: %s\n", file);
1225 return send_response(sock, RESP_ERR,
1226 "stat failed with error %i.\n", status);
1228 if (!S_ISREG (statbuf.st_mode))
1229 return send_response(sock, RESP_ERR, "Not a regular file: %s\n", file);
1231 if (access(file, R_OK|W_OK) != 0)
1232 return send_response(sock, RESP_ERR, "Cannot read/write %s: %s\n",
1233 file, rrd_strerror(errno));
1235 ci = (cache_item_t *) malloc (sizeof (cache_item_t));
1238 RRDD_LOG (LOG_ERR, "handle_request_update: malloc failed.");
1240 return send_response(sock, RESP_ERR, "malloc failed.\n");
1242 memset (ci, 0, sizeof (cache_item_t));
1244 ci->file = strdup (file);
1245 if (ci->file == NULL)
1248 RRDD_LOG (LOG_ERR, "handle_request_update: strdup failed.");
1250 return send_response(sock, RESP_ERR, "strdup failed.\n");
1253 wipe_ci_values(ci, now);
1254 ci->flags = CI_FLAGS_IN_TREE;
1256 pthread_mutex_lock(&cache_lock);
1257 g_tree_insert (cache_tree, (void *) ci->file, (void *) ci);
1259 assert (ci != NULL);
1261 while (buffer_size > 0)
1266 status = buffer_get_field (&buffer, &buffer_size, &value);
1269 RRDD_LOG (LOG_INFO, "handle_request_update: Error reading field.");
1273 temp = (char **) realloc (ci->values,
1274 sizeof (char *) * (ci->values_num + 1));
1277 RRDD_LOG (LOG_ERR, "handle_request_update: realloc failed.");
1282 ci->values[ci->values_num] = strdup (value);
1283 if (ci->values[ci->values_num] == NULL)
1285 RRDD_LOG (LOG_ERR, "handle_request_update: strdup failed.");
1293 if (((now - ci->last_flush_time) >= config_write_interval)
1294 && ((ci->flags & CI_FLAGS_IN_QUEUE) == 0)
1295 && (ci->values_num > 0))
1297 enqueue_cache_item (ci, TAIL);
1300 pthread_mutex_unlock (&cache_lock);
1303 return send_response(sock, RESP_ERR, "No values updated.\n");
1305 return send_response(sock, RESP_OK, "Enqueued %i value(s).\n", values_num);
1310 } /* }}} int handle_request_update */
1312 /* we came across a "WROTE" entry during journal replay.
1313 * throw away any values that we have accumulated for this file
1315 static int handle_request_wrote (const char *buffer) /* {{{ */
1319 const char *file = buffer;
1321 pthread_mutex_lock(&cache_lock);
1323 ci = g_tree_lookup(cache_tree, file);
1326 pthread_mutex_unlock(&cache_lock);
1332 for (i=0; i < ci->values_num; i++)
1333 free(ci->values[i]);
1338 wipe_ci_values(ci, time(NULL));
1339 remove_from_queue(ci);
1341 pthread_mutex_unlock(&cache_lock);
1343 } /* }}} int handle_request_wrote */
1345 /* start "BATCH" processing */
1346 static int batch_start (listen_socket_t *sock) /* {{{ */
1349 if (sock->batch_mode)
1350 return send_response(sock, RESP_ERR, "Already in BATCH\n");
1352 status = send_response(sock, RESP_OK,
1353 "Go ahead. End with dot '.' on its own line.\n");
1354 sock->batch_mode = 1;
1355 sock->batch_cmd = 0;
1358 } /* }}} static int batch_start */
1360 /* finish "BATCH" processing and return results to the client */
1361 static int batch_done (listen_socket_t *sock) /* {{{ */
1363 assert(sock->batch_mode);
1364 sock->batch_mode = 0;
1365 sock->batch_cmd = 0;
1366 return send_response(sock, RESP_OK, "errors\n");
1367 } /* }}} static int batch_done */
1369 /* returns 1 if we have the required privilege level */
1370 static int has_privilege (listen_socket_t *sock, /* {{{ */
1371 socket_privilege priv)
1373 if (sock == NULL) /* journal replay */
1376 if (sock->privilege >= priv)
1379 return send_response(sock, RESP_ERR, "%s\n", rrd_strerror(EACCES));
1380 } /* }}} static int has_privilege */
1382 /* if sock==NULL, we are in journal replay mode */
1383 static int handle_request (listen_socket_t *sock, /* {{{ */
1384 char *buffer, size_t buffer_size)
1390 assert (buffer[buffer_size - 1] == '\0');
1392 buffer_ptr = buffer;
1394 status = buffer_get_field (&buffer_ptr, &buffer_size, &command);
1397 RRDD_LOG (LOG_INFO, "handle_request: Unable parse command.");
1401 if (sock != NULL && sock->batch_mode)
1404 if (strcasecmp (command, "update") == 0)
1406 status = has_privilege(sock, PRIV_HIGH);
1410 /* don't re-write updates in replay mode */
1412 journal_write(command, buffer_ptr);
1414 return (handle_request_update (sock, buffer_ptr, buffer_size));
1416 else if (strcasecmp (command, "wrote") == 0 && sock == NULL)
1418 /* this is only valid in replay mode */
1419 return (handle_request_wrote (buffer_ptr));
1421 else if (strcasecmp (command, "flush") == 0)
1422 return (handle_request_flush (sock, buffer_ptr, buffer_size));
1423 else if (strcasecmp (command, "flushall") == 0)
1425 status = has_privilege(sock, PRIV_HIGH);
1429 return (handle_request_flushall(sock));
1431 else if (strcasecmp (command, "stats") == 0)
1432 return (handle_request_stats (sock));
1433 else if (strcasecmp (command, "help") == 0)
1434 return (handle_request_help (sock, buffer_ptr, buffer_size));
1435 else if (strcasecmp (command, "batch") == 0 && sock != NULL)
1436 return batch_start(sock);
1437 else if (strcasecmp (command, ".") == 0 && sock != NULL && sock->batch_mode)
1438 return batch_done(sock);
1440 return send_response(sock, RESP_ERR, "Unknown command: %s\n", command);
1444 } /* }}} int handle_request */
1446 /* MUST NOT hold journal_lock before calling this */
1447 static void journal_rotate(void) /* {{{ */
1449 FILE *old_fh = NULL;
1452 if (journal_cur == NULL || journal_old == NULL)
1455 pthread_mutex_lock(&journal_lock);
1457 /* we rotate this way (rename before close) so that the we can release
1458 * the journal lock as fast as possible. Journal writes to the new
1459 * journal can proceed immediately after the new file is opened. The
1460 * fclose can then block without affecting new updates.
1462 if (journal_fh != NULL)
1464 old_fh = journal_fh;
1466 rename(journal_cur, journal_old);
1467 ++stats_journal_rotate;
1470 new_fd = open(journal_cur, O_WRONLY|O_CREAT|O_APPEND,
1471 S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
1474 journal_fh = fdopen(new_fd, "a");
1475 if (journal_fh == NULL)
1479 pthread_mutex_unlock(&journal_lock);
1484 if (journal_fh == NULL)
1487 "JOURNALING DISABLED: Cannot open journal file '%s' : (%s)",
1488 journal_cur, rrd_strerror(errno));
1491 "JOURNALING DISABLED: All values will be flushed at shutdown");
1492 config_flush_at_shutdown = 1;
1495 } /* }}} static void journal_rotate */
1497 static void journal_done(void) /* {{{ */
1499 if (journal_cur == NULL)
1502 pthread_mutex_lock(&journal_lock);
1503 if (journal_fh != NULL)
1509 if (config_flush_at_shutdown)
1511 RRDD_LOG(LOG_INFO, "removing journals");
1512 unlink(journal_old);
1513 unlink(journal_cur);
1517 RRDD_LOG(LOG_INFO, "expedited shutdown; "
1518 "journals will be used at next startup");
1521 pthread_mutex_unlock(&journal_lock);
1523 } /* }}} static void journal_done */
1525 static int journal_write(char *cmd, char *args) /* {{{ */
1529 if (journal_fh == NULL)
1532 pthread_mutex_lock(&journal_lock);
1533 chars = fprintf(journal_fh, "%s %s\n", cmd, args);
1534 pthread_mutex_unlock(&journal_lock);
1538 pthread_mutex_lock(&stats_lock);
1539 stats_journal_bytes += chars;
1540 pthread_mutex_unlock(&stats_lock);
1544 } /* }}} static int journal_write */
1546 static int journal_replay (const char *file) /* {{{ */
1552 char entry[CMD_MAX];
1554 if (file == NULL) return 0;
1559 struct stat statbuf;
1561 memset(&statbuf, 0, sizeof(statbuf));
1562 if (stat(file, &statbuf) != 0)
1564 if (errno == ENOENT)
1567 reason = "stat error";
1570 else if (!S_ISREG(statbuf.st_mode))
1572 reason = "not a regular file";
1575 if (statbuf.st_uid != daemon_uid)
1577 reason = "not owned by daemon user";
1580 if (statbuf.st_mode & (S_IWGRP|S_IWOTH))
1582 reason = "must not be user/group writable";
1588 RRDD_LOG(LOG_ERR, "journal_replay: %s : %s (%s)",
1589 file, rrd_strerror(status), reason);
1594 fh = fopen(file, "r");
1597 if (errno != ENOENT)
1598 RRDD_LOG(LOG_ERR, "journal_replay: cannot open journal file: '%s' (%s)",
1599 file, rrd_strerror(errno));
1603 RRDD_LOG(LOG_NOTICE, "replaying from journal: %s", file);
1610 if (fgets(entry, sizeof(entry), fh) == NULL)
1612 entry_len = strlen(entry);
1614 /* check \n termination in case journal writing crashed mid-line */
1617 else if (entry[entry_len - 1] != '\n')
1619 RRDD_LOG(LOG_NOTICE, "Malformed journal entry at line %"PRIu64, line);
1624 entry[entry_len - 1] = '\0';
1626 if (handle_request(NULL, entry, entry_len) == 0)
1634 RRDD_LOG(LOG_INFO, "Replayed %d entries (%d failures)",
1635 entry_cnt, fail_cnt);
1637 return entry_cnt > 0 ? 1 : 0;
1638 } /* }}} static int journal_replay */
1640 static void journal_init(void) /* {{{ */
1642 int had_journal = 0;
1644 if (journal_cur == NULL) return;
1646 pthread_mutex_lock(&journal_lock);
1648 RRDD_LOG(LOG_INFO, "checking for journal files");
1650 had_journal += journal_replay(journal_old);
1651 had_journal += journal_replay(journal_cur);
1653 /* it must have been a crash. start a flush */
1654 if (had_journal && config_flush_at_shutdown)
1655 flush_old_values(-1);
1657 pthread_mutex_unlock(&journal_lock);
1660 RRDD_LOG(LOG_INFO, "journal processing complete");
1662 } /* }}} static void journal_init */
1664 static void close_connection(listen_socket_t *sock)
1666 close(sock->fd) ; sock->fd = -1;
1667 free(sock->rbuf); sock->rbuf = NULL;
1668 free(sock->wbuf); sock->wbuf = NULL;
1673 static void *connection_thread_main (void *args) /* {{{ */
1676 listen_socket_t *sock;
1680 sock = (listen_socket_t *) args;
1683 /* init read buffers */
1684 sock->next_read = sock->next_cmd = 0;
1685 sock->rbuf = malloc(RBUF_SIZE);
1686 if (sock->rbuf == NULL)
1688 RRDD_LOG(LOG_ERR, "connection_thread_main: cannot malloc read buffer");
1689 close_connection(sock);
1693 pthread_mutex_lock (&connection_threads_lock);
1697 temp = (pthread_t *) realloc (connection_threads,
1698 sizeof (pthread_t) * (connection_threads_num + 1));
1701 RRDD_LOG (LOG_ERR, "connection_thread_main: realloc failed.");
1705 connection_threads = temp;
1706 connection_threads[connection_threads_num] = pthread_self ();
1707 connection_threads_num++;
1710 pthread_mutex_unlock (&connection_threads_lock);
1712 while (do_shutdown == 0)
1718 struct pollfd pollfd;
1722 pollfd.events = POLLIN | POLLPRI;
1725 status = poll (&pollfd, 1, /* timeout = */ 500);
1728 else if (status == 0) /* timeout */
1730 else if (status < 0) /* error */
1733 if (status == EINTR)
1735 RRDD_LOG (LOG_ERR, "connection_thread_main: poll(2) failed.");
1739 if ((pollfd.revents & POLLHUP) != 0) /* normal shutdown */
1741 close_connection(sock);
1744 else if ((pollfd.revents & (POLLIN | POLLPRI)) == 0)
1746 RRDD_LOG (LOG_WARNING, "connection_thread_main: "
1747 "poll(2) returned something unexpected: %#04hx",
1749 close_connection(sock);
1753 rbytes = read(fd, sock->rbuf + sock->next_read,
1754 RBUF_SIZE - sock->next_read);
1757 RRDD_LOG(LOG_ERR, "connection_thread_main: read() failed.");
1760 else if (rbytes == 0)
1763 sock->next_read += rbytes;
1765 while ((cmd = next_cmd(sock, &cmd_len)) != NULL)
1767 status = handle_request (sock, cmd, cmd_len+1);
1774 close_connection(sock);
1776 self = pthread_self ();
1777 /* Remove this thread from the connection threads list */
1778 pthread_mutex_lock (&connection_threads_lock);
1779 /* Find out own index in the array */
1780 for (i = 0; i < connection_threads_num; i++)
1781 if (pthread_equal (connection_threads[i], self) != 0)
1783 assert (i < connection_threads_num);
1785 /* Move the trailing threads forward. */
1786 if (i < (connection_threads_num - 1))
1788 memmove (connection_threads + i,
1789 connection_threads + i + 1,
1790 sizeof (pthread_t) * (connection_threads_num - i - 1));
1793 connection_threads_num--;
1794 pthread_mutex_unlock (&connection_threads_lock);
1797 } /* }}} void *connection_thread_main */
1799 static int open_listen_socket_unix (const listen_socket_t *sock) /* {{{ */
1802 struct sockaddr_un sa;
1803 listen_socket_t *temp;
1808 if (strncmp(path, "unix:", strlen("unix:")) == 0)
1809 path += strlen("unix:");
1811 temp = (listen_socket_t *) realloc (listen_fds,
1812 sizeof (listen_fds[0]) * (listen_fds_num + 1));
1815 RRDD_LOG (LOG_ERR, "open_listen_socket_unix: realloc failed.");
1819 memcpy (listen_fds + listen_fds_num, sock, sizeof (listen_fds[0]));
1821 fd = socket (PF_UNIX, SOCK_STREAM, /* protocol = */ 0);
1824 RRDD_LOG (LOG_ERR, "open_listen_socket_unix: socket(2) failed.");
1828 memset (&sa, 0, sizeof (sa));
1829 sa.sun_family = AF_UNIX;
1830 strncpy (sa.sun_path, path, sizeof (sa.sun_path) - 1);
1832 status = bind (fd, (struct sockaddr *) &sa, sizeof (sa));
1835 RRDD_LOG (LOG_ERR, "open_listen_socket_unix: bind(2) failed.");
1841 status = listen (fd, /* backlog = */ 10);
1844 RRDD_LOG (LOG_ERR, "open_listen_socket_unix: listen(2) failed.");
1850 listen_fds[listen_fds_num].fd = fd;
1851 listen_fds[listen_fds_num].family = PF_UNIX;
1852 strncpy(listen_fds[listen_fds_num].addr, path,
1853 sizeof (listen_fds[listen_fds_num].addr) - 1);
1857 } /* }}} int open_listen_socket_unix */
1859 static int open_listen_socket_network(const listen_socket_t *sock) /* {{{ */
1861 struct addrinfo ai_hints;
1862 struct addrinfo *ai_res;
1863 struct addrinfo *ai_ptr;
1864 char addr_copy[NI_MAXHOST];
1869 strncpy (addr_copy, sock->addr, sizeof (addr_copy));
1870 addr_copy[sizeof (addr_copy) - 1] = 0;
1873 memset (&ai_hints, 0, sizeof (ai_hints));
1874 ai_hints.ai_flags = 0;
1875 #ifdef AI_ADDRCONFIG
1876 ai_hints.ai_flags |= AI_ADDRCONFIG;
1878 ai_hints.ai_family = AF_UNSPEC;
1879 ai_hints.ai_socktype = SOCK_STREAM;
1882 if (*addr == '[') /* IPv6+port format */
1884 /* `addr' is something like "[2001:780:104:2:211:24ff:feab:26f8]:12345" */
1887 port = strchr (addr, ']');
1890 RRDD_LOG (LOG_ERR, "open_listen_socket_network: Malformed address: %s",
1899 else if (*port == 0)
1903 RRDD_LOG (LOG_ERR, "open_listen_socket_network: Garbage after address: %s",
1907 } /* if (*addr = ']') */
1908 else if (strchr (addr, '.') != NULL) /* Hostname or IPv4 */
1910 port = rindex(addr, ':');
1918 status = getaddrinfo (addr,
1919 port == NULL ? RRDCACHED_DEFAULT_PORT : port,
1920 &ai_hints, &ai_res);
1923 RRDD_LOG (LOG_ERR, "open_listen_socket_network: getaddrinfo(%s) failed: "
1924 "%s", addr, gai_strerror (status));
1928 for (ai_ptr = ai_res; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1931 listen_socket_t *temp;
1934 temp = (listen_socket_t *) realloc (listen_fds,
1935 sizeof (listen_fds[0]) * (listen_fds_num + 1));
1938 RRDD_LOG (LOG_ERR, "open_listen_socket_network: realloc failed.");
1942 memcpy (listen_fds + listen_fds_num, sock, sizeof (listen_fds[0]));
1944 fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1947 RRDD_LOG (LOG_ERR, "open_listen_socket_network: socket(2) failed.");
1951 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
1953 status = bind (fd, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1956 RRDD_LOG (LOG_ERR, "open_listen_socket_network: bind(2) failed.");
1961 status = listen (fd, /* backlog = */ 10);
1964 RRDD_LOG (LOG_ERR, "open_listen_socket_network: listen(2) failed.");
1969 listen_fds[listen_fds_num].fd = fd;
1970 listen_fds[listen_fds_num].family = ai_ptr->ai_family;
1972 } /* for (ai_ptr) */
1975 } /* }}} static int open_listen_socket_network */
1977 static int open_listen_socket (const listen_socket_t *sock) /* {{{ */
1979 assert(sock != NULL);
1980 assert(sock->addr != NULL);
1982 if (strncmp ("unix:", sock->addr, strlen ("unix:")) == 0
1983 || sock->addr[0] == '/')
1984 return (open_listen_socket_unix(sock));
1986 return (open_listen_socket_network(sock));
1987 } /* }}} int open_listen_socket */
1989 static int close_listen_sockets (void) /* {{{ */
1993 for (i = 0; i < listen_fds_num; i++)
1995 close (listen_fds[i].fd);
1997 if (listen_fds[i].family == PF_UNIX)
1998 unlink(listen_fds[i].addr);
2006 } /* }}} int close_listen_sockets */
2008 static void *listen_thread_main (void *args __attribute__((unused))) /* {{{ */
2010 struct pollfd *pollfds;
2015 for (i = 0; i < config_listen_address_list_len; i++)
2016 open_listen_socket (config_listen_address_list[i]);
2018 if (config_listen_address_list_len < 1)
2020 listen_socket_t sock;
2021 memset(&sock, 0, sizeof(sock));
2022 strncpy(sock.addr, RRDCACHED_DEFAULT_ADDRESS, sizeof(sock.addr));
2023 open_listen_socket (&sock);
2026 if (listen_fds_num < 1)
2028 RRDD_LOG (LOG_ERR, "listen_thread_main: No listen sockets "
2029 "could be opened. Sorry.");
2033 pollfds_num = listen_fds_num;
2034 pollfds = (struct pollfd *) malloc (sizeof (*pollfds) * pollfds_num);
2035 if (pollfds == NULL)
2037 RRDD_LOG (LOG_ERR, "listen_thread_main: malloc failed.");
2040 memset (pollfds, 0, sizeof (*pollfds) * pollfds_num);
2042 RRDD_LOG(LOG_INFO, "listening for connections");
2044 while (do_shutdown == 0)
2046 assert (pollfds_num == ((int) listen_fds_num));
2047 for (i = 0; i < pollfds_num; i++)
2049 pollfds[i].fd = listen_fds[i].fd;
2050 pollfds[i].events = POLLIN | POLLPRI;
2051 pollfds[i].revents = 0;
2054 status = poll (pollfds, pollfds_num, /* timeout = */ 1000);
2057 else if (status == 0) /* timeout */
2059 else if (status < 0) /* error */
2062 if (status != EINTR)
2064 RRDD_LOG (LOG_ERR, "listen_thread_main: poll(2) failed.");
2069 for (i = 0; i < pollfds_num; i++)
2071 listen_socket_t *client_sock;
2072 struct sockaddr_storage client_sa;
2073 socklen_t client_sa_size;
2075 pthread_attr_t attr;
2077 if (pollfds[i].revents == 0)
2080 if ((pollfds[i].revents & (POLLIN | POLLPRI)) == 0)
2082 RRDD_LOG (LOG_ERR, "listen_thread_main: "
2083 "poll(2) returned something unexpected for listen FD #%i.",
2088 client_sock = (listen_socket_t *) malloc (sizeof (listen_socket_t));
2089 if (client_sock == NULL)
2091 RRDD_LOG (LOG_ERR, "listen_thread_main: malloc failed.");
2094 memcpy(client_sock, &listen_fds[i], sizeof(listen_fds[0]));
2096 client_sa_size = sizeof (client_sa);
2097 client_sock->fd = accept (pollfds[i].fd,
2098 (struct sockaddr *) &client_sa, &client_sa_size);
2099 if (client_sock->fd < 0)
2101 RRDD_LOG (LOG_ERR, "listen_thread_main: accept(2) failed.");
2106 pthread_attr_init (&attr);
2107 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
2109 status = pthread_create (&tid, &attr, connection_thread_main,
2113 RRDD_LOG (LOG_ERR, "listen_thread_main: pthread_create failed.");
2114 close_connection(client_sock);
2117 } /* for (pollfds_num) */
2118 } /* while (do_shutdown == 0) */
2120 RRDD_LOG(LOG_INFO, "starting shutdown");
2122 close_listen_sockets ();
2124 pthread_mutex_lock (&connection_threads_lock);
2125 while (connection_threads_num > 0)
2129 wait_for = connection_threads[0];
2131 pthread_mutex_unlock (&connection_threads_lock);
2132 pthread_join (wait_for, /* retval = */ NULL);
2133 pthread_mutex_lock (&connection_threads_lock);
2135 pthread_mutex_unlock (&connection_threads_lock);
2138 } /* }}} void *listen_thread_main */
2140 static int daemonize (void) /* {{{ */
2146 daemon_uid = geteuid();
2148 fd = open_pidfile();
2149 if (fd < 0) return fd;
2151 if (!stay_foreground)
2158 fprintf (stderr, "daemonize: fork(2) failed.\n");
2166 /* Become session leader */
2169 /* Open the first three file descriptors to /dev/null */
2174 open ("/dev/null", O_RDWR);
2177 } /* if (!stay_foreground) */
2179 /* Change into the /tmp directory. */
2180 base_dir = (config_base_dir != NULL)
2183 status = chdir (base_dir);
2186 fprintf (stderr, "daemonize: chdir (%s) failed.\n", base_dir);
2190 install_signal_handlers();
2192 openlog ("rrdcached", LOG_PID, LOG_DAEMON);
2193 RRDD_LOG(LOG_INFO, "starting up");
2195 cache_tree = g_tree_new ((GCompareFunc) strcmp);
2196 if (cache_tree == NULL)
2198 RRDD_LOG (LOG_ERR, "daemonize: g_tree_new failed.");
2202 status = write_pidfile (fd);
2204 } /* }}} int daemonize */
2206 static int cleanup (void) /* {{{ */
2210 pthread_cond_signal (&cache_cond);
2211 pthread_join (queue_thread, /* return = */ NULL);
2215 RRDD_LOG(LOG_INFO, "goodbye");
2219 } /* }}} int cleanup */
2221 static int read_options (int argc, char **argv) /* {{{ */
2226 while ((option = getopt(argc, argv, "gl:L:f:w:b:Bz:p:j:h?F")) != -1)
2237 listen_socket_t **temp;
2238 listen_socket_t *new;
2240 new = malloc(sizeof(listen_socket_t));
2243 fprintf(stderr, "read_options: malloc failed.\n");
2246 memset(new, 0, sizeof(listen_socket_t));
2248 temp = (listen_socket_t **) realloc (config_listen_address_list,
2249 sizeof (listen_socket_t *) * (config_listen_address_list_len + 1));
2252 fprintf (stderr, "read_options: realloc failed.\n");
2255 config_listen_address_list = temp;
2257 strncpy(new->addr, optarg, sizeof(new->addr)-1);
2258 new->privilege = (option == 'l') ? PRIV_HIGH : PRIV_LOW;
2260 temp[config_listen_address_list_len] = new;
2261 config_listen_address_list_len++;
2269 temp = atoi (optarg);
2271 config_flush_interval = temp;
2274 fprintf (stderr, "Invalid flush interval: %s\n", optarg);
2284 temp = atoi (optarg);
2286 config_write_interval = temp;
2289 fprintf (stderr, "Invalid write interval: %s\n", optarg);
2299 temp = atoi(optarg);
2301 config_write_jitter = temp;
2304 fprintf (stderr, "Invalid write jitter: -z %s\n", optarg);
2312 config_write_base_only = 1;
2319 if (config_base_dir != NULL)
2320 free (config_base_dir);
2321 config_base_dir = strdup (optarg);
2322 if (config_base_dir == NULL)
2324 fprintf (stderr, "read_options: strdup failed.\n");
2328 len = strlen (config_base_dir);
2329 while ((len > 0) && (config_base_dir[len - 1] == '/'))
2331 config_base_dir[len - 1] = 0;
2337 fprintf (stderr, "Invalid base directory: %s\n", optarg);
2341 _config_base_dir_len = len;
2347 if (config_pid_file != NULL)
2348 free (config_pid_file);
2349 config_pid_file = strdup (optarg);
2350 if (config_pid_file == NULL)
2352 fprintf (stderr, "read_options: strdup failed.\n");
2359 config_flush_at_shutdown = 1;
2364 struct stat statbuf;
2365 const char *dir = optarg;
2367 status = stat(dir, &statbuf);
2370 fprintf(stderr, "Cannot stat '%s' : %s\n", dir, rrd_strerror(errno));
2374 if (!S_ISDIR(statbuf.st_mode)
2375 || access(dir, R_OK|W_OK|X_OK) != 0)
2377 fprintf(stderr, "Must specify a writable directory with -j! (%s)\n",
2378 errno ? rrd_strerror(errno) : "");
2382 journal_cur = malloc(PATH_MAX + 1);
2383 journal_old = malloc(PATH_MAX + 1);
2384 if (journal_cur == NULL || journal_old == NULL)
2386 fprintf(stderr, "malloc failure for journal files\n");
2391 snprintf(journal_cur, PATH_MAX, "%s/rrd.journal", dir);
2392 snprintf(journal_old, PATH_MAX, "%s/rrd.journal.old", dir);
2399 printf ("RRDCacheD %s Copyright (C) 2008 Florian octo Forster\n"
2401 "Usage: rrdcached [options]\n"
2403 "Valid options are:\n"
2404 " -l <address> Socket address to listen to.\n"
2405 " -L <address> Socket address to listen to ('FLUSH' only).\n"
2406 " -w <seconds> Interval in which to write data.\n"
2407 " -z <delay> Delay writes up to <delay> seconds to spread load\n"
2408 " -f <seconds> Interval in which to flush dead data.\n"
2409 " -p <file> Location of the PID-file.\n"
2410 " -b <dir> Base directory to change to.\n"
2411 " -B Restrict file access to paths within -b <dir>\n"
2412 " -g Do not fork and run in the foreground.\n"
2413 " -j <dir> Directory in which to create the journal files.\n"
2414 " -F Always flush all updates at shutdown\n"
2416 "For more information and a detailed description of all options "
2418 "to the rrdcached(1) manual page.\n",
2422 } /* switch (option) */
2423 } /* while (getopt) */
2425 /* advise the user when values are not sane */
2426 if (config_flush_interval < 2 * config_write_interval)
2427 fprintf(stderr, "WARNING: flush interval (-f) should be at least"
2428 " 2x write interval (-w) !\n");
2429 if (config_write_jitter > config_write_interval)
2430 fprintf(stderr, "WARNING: write delay (-z) should NOT be larger than"
2431 " write interval (-w) !\n");
2433 if (config_write_base_only && config_base_dir == NULL)
2434 fprintf(stderr, "WARNING: -B does not make sense without -b!\n"
2435 " Consult the rrdcached documentation\n");
2437 if (journal_cur == NULL)
2438 config_flush_at_shutdown = 1;
2441 } /* }}} int read_options */
2443 int main (int argc, char **argv)
2447 status = read_options (argc, argv);
2455 status = daemonize ();
2458 struct sigaction sigchld;
2460 memset (&sigchld, 0, sizeof (sigchld));
2461 sigchld.sa_handler = SIG_IGN;
2462 sigaction (SIGCHLD, &sigchld, NULL);
2466 else if (status != 0)
2468 fprintf (stderr, "daemonize failed, exiting.\n");
2474 /* start the queue thread */
2475 memset (&queue_thread, 0, sizeof (queue_thread));
2476 status = pthread_create (&queue_thread,
2482 RRDD_LOG (LOG_ERR, "FATAL: cannot create queue thread");
2487 listen_thread_main (NULL);
2494 * vim: set sw=2 sts=2 ts=8 et fdm=marker :