2 * collectd - src/unixsock.c
3 * Copyright (C) 2007 Florian octo Forster
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Florian octo Forster <octo at verplant.org>
25 #include "configfile.h"
27 /* Folks without pthread will need to disable this plugin. */
30 #include <sys/socket.h>
36 # define UNIX_PATH_MAX sizeof (((struct sockaddr_un *)0)->sun_path)
39 #define US_DEFAULT_PATH PREFIX"/var/run/"PACKAGE_NAME"-unixsock"
42 * Private data structures
44 /* linked list of cached values */
45 typedef struct value_cache_s
47 char name[4*DATA_MAX_NAME_LEN];
53 struct value_cache_s *next;
59 /* valid configuration file keys */
60 static const char *config_keys[] =
67 static int config_keys_num = 3;
71 /* socket configuration */
72 static int sock_fd = -1;
73 static char *sock_file = NULL;
74 static char *sock_group = NULL;
75 static int sock_perms = S_IRWXU | S_IRWXG;
77 static pthread_t listen_thread = (pthread_t) 0;
79 /* Linked list and auxilliary variables for saving values */
80 static value_cache_t *cache_head = NULL;
81 static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
82 static unsigned int cache_oldest = UINT_MAX;
87 static value_cache_t *cache_search (const char *name)
91 for (vc = cache_head; vc != NULL; vc = vc->next)
93 if (strcmp (vc->name, name) == 0)
95 } /* for vc = cache_head .. NULL */
98 } /* value_cache_t *cache_search */
100 static int cache_insert (const data_set_t *ds, const value_list_t *vl)
102 /* We're called from `cache_update' so we don't need to lock the mutex */
106 DEBUG ("unixsock plugin: cache_insert: ds->type = %s; ds->ds_num = %i;"
107 " vl->values_len = %i;",
108 ds->type, ds->ds_num, vl->values_len);
110 assert (ds->ds_num == vl->values_len);
112 if (ds->ds_num != vl->values_len)
114 ERROR ("unixsock plugin: ds->type = %s: (ds->ds_num = %i) != "
115 "(vl->values_len = %i)",
116 ds->type, ds->ds_num, vl->values_len);
121 vc = (value_cache_t *) malloc (sizeof (value_cache_t));
125 pthread_mutex_unlock (&cache_lock);
126 ERROR ("unixsock plugin: malloc failed: %s",
127 sstrerror (errno, errbuf, sizeof (errbuf)));
131 vc->gauge = (gauge_t *) malloc (sizeof (gauge_t) * vl->values_len);
132 if (vc->gauge == NULL)
135 pthread_mutex_unlock (&cache_lock);
136 ERROR ("unixsock plugin: malloc failed: %s",
137 sstrerror (errno, errbuf, sizeof (errbuf)));
142 vc->counter = (counter_t *) malloc (sizeof (counter_t) * vl->values_len);
143 if (vc->counter == NULL)
146 pthread_mutex_unlock (&cache_lock);
147 ERROR ("unixsock plugin: malloc failed: %s",
148 sstrerror (errno, errbuf, sizeof (errbuf)));
154 if (FORMAT_VL (vc->name, sizeof (vc->name), vl, ds))
156 pthread_mutex_unlock (&cache_lock);
157 ERROR ("unixsock plugin: FORMAT_VL failed.");
164 for (i = 0; i < ds->ds_num; i++)
166 if (ds->ds[i].type == DS_TYPE_COUNTER)
169 vc->counter[i] = vl->values[i].counter;
171 else if (ds->ds[i].type == DS_TYPE_GAUGE)
173 vc->gauge[i] = vl->values[i].gauge;
182 vc->values_num = ds->ds_num;
185 vc->next = cache_head;
189 if (vc->time < cache_oldest)
190 cache_oldest = vc->time;
192 pthread_mutex_unlock (&cache_lock);
194 } /* int cache_insert */
196 static int cache_update (const data_set_t *ds, const value_list_t *vl)
198 char name[4*DATA_MAX_NAME_LEN];;
202 if (FORMAT_VL (name, sizeof (name), vl, ds) != 0)
205 pthread_mutex_lock (&cache_lock);
207 vc = cache_search (name);
209 /* pthread_mutex_lock is called by cache_insert. */
211 return (cache_insert (ds, vl));
213 assert (vc->values_num == ds->ds_num);
214 assert (vc->values_num == vl->values_len);
216 /* Avoid floating-point exceptions due to division by zero. */
217 if (vc->time >= vl->time)
219 pthread_mutex_unlock (&cache_lock);
220 ERROR ("unixsock plugin: vc->time >= vl->time. vc->time = %u; "
221 "vl->time = %u; vl = %s;",
222 (unsigned int) vc->time, (unsigned int) vl->time,
225 } /* if (vc->time >= vl->time) */
228 * Update the values. This is possibly a lot more that you'd expect
229 * because we honor min and max values and handle counter overflows here.
231 for (i = 0; i < ds->ds_num; i++)
233 if (ds->ds[i].type == DS_TYPE_COUNTER)
235 if (vl->values[i].counter < vc->counter[i])
237 if (vl->values[i].counter <= 4294967295U)
239 vc->gauge[i] = ((4294967295U - vl->values[i].counter)
240 + vc->counter[i]) / (vl->time - vc->time);
244 vc->gauge[i] = ((18446744073709551615ULL - vl->values[i].counter)
245 + vc->counter[i]) / (vl->time - vc->time);
250 vc->gauge[i] = (vl->values[i].counter - vc->counter[i])
251 / (vl->time - vc->time);
254 vc->counter[i] = vl->values[i].counter;
256 else if (ds->ds[i].type == DS_TYPE_GAUGE)
258 vc->gauge[i] = vl->values[i].gauge;
267 if (isnan (vc->gauge[i])
268 || (!isnan (ds->ds[i].min) && (vc->gauge[i] < ds->ds[i].min))
269 || (!isnan (ds->ds[i].max) && (vc->gauge[i] > ds->ds[i].max)))
271 } /* for i = 0 .. ds->ds_num */
276 if (vc->time < cache_oldest)
277 cache_oldest = vc->time;
279 pthread_mutex_unlock (&cache_lock);
281 } /* int cache_update */
283 static void cache_flush (int max_age)
289 pthread_mutex_lock (&cache_lock);
293 if ((now - cache_oldest) <= max_age)
295 pthread_mutex_unlock (&cache_lock);
306 if ((now - this->time) <= max_age)
308 if (this->time < cache_oldest)
309 cache_oldest = this->time;
317 cache_head = this->next;
319 prev->next = this->next;
322 free (this->counter);
329 } /* while (this != NULL) */
331 pthread_mutex_unlock (&cache_lock);
332 } /* int cache_flush */
334 static int us_open_socket (void)
336 struct sockaddr_un sa;
339 sock_fd = socket (PF_UNIX, SOCK_STREAM, 0);
343 ERROR ("unixsock plugin: socket failed: %s",
344 sstrerror (errno, errbuf, sizeof (errbuf)));
348 memset (&sa, '\0', sizeof (sa));
349 sa.sun_family = AF_UNIX;
350 strncpy (sa.sun_path, (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
351 sizeof (sa.sun_path) - 1);
352 /* unlink (sa.sun_path); */
354 DEBUG ("unixsock plugin: socket path = %s", sa.sun_path);
356 status = bind (sock_fd, (struct sockaddr *) &sa, sizeof (sa));
360 sstrerror (errno, errbuf, sizeof (errbuf));
361 ERROR ("unixsock plugin: bind failed: %s", errbuf);
367 status = listen (sock_fd, 8);
371 ERROR ("unixsock plugin: listen failed: %s",
372 sstrerror (errno, errbuf, sizeof (errbuf)));
385 grpname = (sock_group != NULL) ? sock_group : COLLECTD_GRP_NAME;
388 status = getgrnam_r (grpname, &sg, grbuf, sizeof (grbuf), &g);
392 WARNING ("unixsock plugin: getgrnam_r (%s) failed: %s", grpname,
393 sstrerror (errno, errbuf, sizeof (errbuf)));
398 WARNING ("unixsock plugin: No such group: `%s'",
403 if (chown ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
404 (uid_t) -1, g->gr_gid) != 0)
407 WARNING ("unixsock plugin: chown (%s, -1, %i) failed: %s",
408 (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
410 sstrerror (errno, errbuf, sizeof (errbuf)));
415 } /* int us_open_socket */
417 static int us_handle_getval (FILE *fh, char **fields, int fields_num)
421 char *plugin_instance;
424 char name[4*DATA_MAX_NAME_LEN];
431 DEBUG ("unixsock plugin: Wrong number of fields: %i", fields_num);
432 fprintf (fh, "-1 Wrong number of fields: Got %i, expected 2.\n",
437 DEBUG ("unixsock plugin: Got query for `%s'", fields[1]);
439 status = parse_identifier (fields[1], &hostname,
440 &plugin, &plugin_instance,
441 &type, &type_instance);
444 DEBUG ("unixsock plugin: Cannot parse `%s'", fields[1]);
445 fprintf (fh, "-1 Cannot parse identifier.\n");
450 status = format_name (name, sizeof (name),
451 hostname, plugin, plugin_instance, type, type_instance);
454 fprintf (fh, "-1 format_name failed.\n");
458 pthread_mutex_lock (&cache_lock);
460 DEBUG ("vc = cache_search (%s)", name);
461 vc = cache_search (name);
465 DEBUG ("Did not find cache entry.");
466 fprintf (fh, "-1 No such value");
470 DEBUG ("Found cache entry.");
471 fprintf (fh, "%i", vc->values_num);
472 for (i = 0; i < vc->values_num; i++)
474 fprintf (fh, " %s=", vc->ds->ds[i].name);
475 if (isnan (vc->gauge[i]))
478 fprintf (fh, "%12e", vc->gauge[i]);
482 /* Free the mutex as soon as possible and definitely before flushing */
483 pthread_mutex_unlock (&cache_lock);
489 } /* int us_handle_getval */
491 static int us_handle_putval (FILE *fh, char **fields, int fields_num)
495 char *plugin_instance;
501 const data_set_t *ds;
502 value_list_t vl = VALUE_LIST_INIT;
508 DEBUG ("unixsock plugin: Wrong number of fields: %i", fields_num);
509 fprintf (fh, "-1 Wrong number of fields: Got %i, expected 3.\n",
515 status = parse_identifier (fields[1], &hostname,
516 &plugin, &plugin_instance,
517 &type, &type_instance);
520 DEBUG ("unixsock plugin: Cannot parse `%s'", fields[1]);
521 fprintf (fh, "-1 Cannot parse identifier.\n");
526 if ((strlen (hostname) >= sizeof (vl.host))
527 || (strlen (plugin) >= sizeof (vl.plugin))
528 || ((plugin_instance != NULL)
529 && (strlen (plugin_instance) >= sizeof (vl.plugin_instance)))
530 || ((type_instance != NULL)
531 && (strlen (type_instance) >= sizeof (vl.type_instance))))
533 fprintf (fh, "-1 Identifier too long.");
537 strcpy (vl.host, hostname);
538 strcpy (vl.plugin, plugin);
539 if (plugin_instance != NULL)
540 strcpy (vl.plugin_instance, plugin_instance);
541 if (type_instance != NULL)
542 strcpy (vl.type_instance, type_instance);
544 { /* parse the time */
546 char *v = strchr (t, ':');
549 fprintf (fh, "-1 No time found.");
554 vl.time = (time_t) atoi (t);
556 vl.time = time (NULL);
561 ds = plugin_get_ds (type);
565 value_ptr = (char **) calloc (ds->ds_num, sizeof (char *));
566 if (value_ptr == NULL)
568 fprintf (fh, "-1 calloc failed.");
572 { /* parse the value-list. It's colon-separated. */
580 while ((ptr = strtok_r (dummy, ":", &saveptr)) != NULL)
595 fprintf (fh, "-1 Number of values incorrect: Got %i, "
596 "expected %i.", i, ds->ds_num);
599 } /* done parsing the value-list */
601 vl.values_len = ds->ds_num;
602 vl.values = (value_t *) malloc (vl.values_len * sizeof (value_t));
603 if (vl.values == NULL)
606 fprintf (fh, "-1 malloc failed.");
609 DEBUG ("value_ptr = 0x%p; vl.values = 0x%p;", (void *) value_ptr, (void *) vl.values);
611 for (i = 0; i < ds->ds_num; i++)
613 if (strcmp (value_ptr[i], "U") == 0)
614 vl.values[i].gauge = NAN;
615 else if (ds->ds[i].type == DS_TYPE_COUNTER)
616 vl.values[i].counter = atoll (value_ptr[i]);
617 else if (ds->ds[i].type == DS_TYPE_GAUGE)
618 vl.values[i].gauge = atof (value_ptr[i]);
619 } /* for (i = 2 .. fields_num) */
621 plugin_dispatch_values (type, &vl);
623 DEBUG ("value_ptr = 0x%p; vl.values = 0x%p;", (void *) value_ptr, (void *) vl.values);
628 fprintf (fh, "0 Success\n");
632 } /* int us_handle_putval */
634 static void *us_handle_client (void *arg)
646 DEBUG ("Reading from fd #%i", fd);
648 fh = fdopen (fd, "r+");
652 ERROR ("unixsock plugin: fdopen failed: %s",
653 sstrerror (errno, errbuf, sizeof (errbuf)));
655 pthread_exit ((void *) 1);
658 while (fgets (buffer, sizeof (buffer), fh) != NULL)
662 len = strlen (buffer);
664 && ((buffer[len - 1] == '\n') || (buffer[len - 1] == '\r')))
665 buffer[--len] = '\0';
670 DEBUG ("fgets -> buffer = %s; len = %i;", buffer, len);
672 fields_num = strsplit (buffer, fields,
673 sizeof (fields) / sizeof (fields[0]));
681 if (strcasecmp (fields[0], "getval") == 0)
683 us_handle_getval (fh, fields, fields_num);
685 else if (strcasecmp (fields[0], "putval") == 0)
687 us_handle_putval (fh, fields, fields_num);
691 fprintf (fh, "-1 Unknown command: %s\n", fields[0]);
694 } /* while (fgets) */
699 pthread_exit ((void *) 0);
700 } /* void *us_handle_client */
702 static void *us_server_thread (void *arg)
707 pthread_attr_t th_attr;
709 if (us_open_socket () != 0)
710 pthread_exit ((void *) 1);
714 DEBUG ("Calling accept..");
715 status = accept (sock_fd, NULL, NULL);
723 ERROR ("unixsock plugin: accept failed: %s",
724 sstrerror (errno, errbuf, sizeof (errbuf)));
727 pthread_exit ((void *) 1);
730 remote_fd = (int *) malloc (sizeof (int));
731 if (remote_fd == NULL)
734 WARNING ("unixsock plugin: malloc failed: %s",
735 sstrerror (errno, errbuf, sizeof (errbuf)));
741 DEBUG ("Spawning child to handle connection on fd #%i", *remote_fd);
743 pthread_attr_init (&th_attr);
744 pthread_attr_setdetachstate (&th_attr, PTHREAD_CREATE_DETACHED);
746 status = pthread_create (&th, &th_attr, us_handle_client, (void *) remote_fd);
750 WARNING ("unixsock plugin: pthread_create failed: %s",
751 sstrerror (errno, errbuf, sizeof (errbuf)));
761 status = unlink ((sock_file != NULL) ? sock_file : US_DEFAULT_PATH);
765 NOTICE ("unixsock plugin: unlink (%s) failed: %s",
766 (sock_file != NULL) ? sock_file : US_DEFAULT_PATH,
767 sstrerror (errno, errbuf, sizeof (errbuf)));
771 } /* void *us_server_thread */
773 static int us_config (const char *key, const char *val)
775 if (strcasecmp (key, "SocketFile") == 0)
778 sock_file = strdup (val);
780 else if (strcasecmp (key, "SocketGroup") == 0)
783 sock_group = strdup (val);
785 else if (strcasecmp (key, "SocketPerms") == 0)
787 sock_perms = (int) strtol (val, NULL, 8);
795 } /* int us_config */
797 static int us_init (void)
803 status = pthread_create (&listen_thread, NULL, us_server_thread, NULL);
807 ERROR ("unixsock plugin: pthread_create failed: %s",
808 sstrerror (errno, errbuf, sizeof (errbuf)));
815 static int us_shutdown (void)
821 if (listen_thread != (pthread_t) 0)
823 pthread_kill (listen_thread, SIGTERM);
824 pthread_join (listen_thread, &ret);
825 listen_thread = (pthread_t) 0;
828 plugin_unregister_init ("unixsock");
829 plugin_unregister_write ("unixsock");
830 plugin_unregister_shutdown ("unixsock");
833 } /* int us_shutdown */
835 static int us_write (const data_set_t *ds, const value_list_t *vl)
837 cache_update (ds, vl);
838 cache_flush (2 * interval_g);
843 void module_register (void)
845 plugin_register_config ("unixsock", us_config,
846 config_keys, config_keys_num);
847 plugin_register_init ("unixsock", us_init);
848 plugin_register_write ("unixsock", us_write);
849 plugin_register_shutdown ("unixsock", us_shutdown);
850 } /* void module_register (void) */
852 /* vim: set sw=4 ts=4 sts=4 tw=78 : */