2 * collectd - src/email.c
3 * Copyright (C) 2006-2008 Sebastian Harl
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 * Sebastian Harl <sh at tokkee.org>
23 * This plugin communicates with a spam filter, a virus scanner or similar
24 * software using a UNIX socket and a very simple protocol:
26 * e-mail type (e.g. ham, spam, virus, ...) and size
32 * successful spam checks
33 * c:<type1>[,<type2>,...]
40 #include "configfile.h"
48 #include <sys/socket.h>
50 #include <sys/select.h>
52 /* some systems (e.g. Darwin) seem to not define UNIX_PATH_MAX at all */
54 # define UNIX_PATH_MAX sizeof (((struct sockaddr_un *)0)->sun_path)
55 #endif /* UNIX_PATH_MAX */
59 #endif /* HAVE_GRP_H */
61 #define SOCK_PATH LOCALSTATEDIR"/run/"PACKAGE_NAME"-email"
63 #define MAX_CONNS_LIMIT 16384
65 #define log_debug(...) DEBUG ("email: "__VA_ARGS__)
66 #define log_err(...) ERROR ("email: "__VA_ARGS__)
67 #define log_warn(...) WARNING ("email: "__VA_ARGS__)
70 * Private data structures
72 /* linked list of email and check types */
84 /* collector thread control information */
85 typedef struct collector {
88 /* socket descriptor of the current/last connection */
92 /* linked list of pending connections */
94 /* socket to read data from */
97 /* linked list of connections */
109 /* valid configuration file keys */
110 static const char *config_keys[] =
117 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
119 /* socket configuration */
120 static char *sock_file = NULL;
121 static char *sock_group = NULL;
122 static int sock_perms = S_IRWXU | S_IRWXG;
123 static int max_conns = MAX_CONNS;
125 /* state of the plugin */
126 static int disabled = 0;
128 /* thread managing "client" connections */
129 static pthread_t connector = (pthread_t) 0;
130 static int connector_socket = -1;
132 /* tell the collector threads that a new connection is available */
133 static pthread_cond_t conn_available = PTHREAD_COND_INITIALIZER;
135 /* connections that are waiting to be processed */
136 static pthread_mutex_t conns_mutex = PTHREAD_MUTEX_INITIALIZER;
137 static conn_list_t conns;
139 /* tell the connector thread that a collector is available */
140 static pthread_cond_t collector_available = PTHREAD_COND_INITIALIZER;
142 /* collector threads */
143 static collector_t **collectors = NULL;
145 static pthread_mutex_t available_mutex = PTHREAD_MUTEX_INITIALIZER;
146 static int available_collectors;
148 static pthread_mutex_t count_mutex = PTHREAD_MUTEX_INITIALIZER;
149 static type_list_t list_count;
150 static type_list_t list_count_copy;
152 static pthread_mutex_t size_mutex = PTHREAD_MUTEX_INITIALIZER;
153 static type_list_t list_size;
154 static type_list_t list_size_copy;
156 static pthread_mutex_t score_mutex = PTHREAD_MUTEX_INITIALIZER;
158 static int score_count;
160 static pthread_mutex_t check_mutex = PTHREAD_MUTEX_INITIALIZER;
161 static type_list_t list_check;
162 static type_list_t list_check_copy;
167 static int email_config (const char *key, const char *value)
169 if (0 == strcasecmp (key, "SocketFile")) {
170 if (NULL != sock_file)
172 sock_file = sstrdup (value);
174 else if (0 == strcasecmp (key, "SocketGroup")) {
175 if (NULL != sock_group)
177 sock_group = sstrdup (value);
179 else if (0 == strcasecmp (key, "SocketPerms")) {
180 /* the user is responsible for providing reasonable values */
181 sock_perms = (int)strtol (value, NULL, 8);
183 else if (0 == strcasecmp (key, "MaxConns")) {
184 long int tmp = strtol (value, NULL, 0);
187 fprintf (stderr, "email plugin: `MaxConns' was set to invalid "
188 "value %li, will use default %i.\n",
190 max_conns = MAX_CONNS;
192 else if (tmp > MAX_CONNS_LIMIT) {
193 fprintf (stderr, "email plugin: `MaxConns' was set to invalid "
194 "value %li, will use hardcoded limit %i.\n",
195 tmp, MAX_CONNS_LIMIT);
196 max_conns = MAX_CONNS_LIMIT;
199 max_conns = (int)tmp;
206 } /* static int email_config (char *, char *) */
208 /* Increment the value of the given name in the given list by incr. */
209 static void type_list_incr (type_list_t *list, char *name, int incr)
211 if (NULL == list->head) {
212 list->head = (type_t *)smalloc (sizeof (type_t));
214 list->head->name = sstrdup (name);
215 list->head->value = incr;
216 list->head->next = NULL;
218 list->tail = list->head;
223 for (ptr = list->head; NULL != ptr; ptr = ptr->next) {
224 if (0 == strcmp (name, ptr->name))
229 list->tail->next = (type_t *)smalloc (sizeof (type_t));
230 list->tail = list->tail->next;
232 list->tail->name = sstrdup (name);
233 list->tail->value = incr;
234 list->tail->next = NULL;
241 } /* static void type_list_incr (type_list_t *, char *) */
243 static void *collect (void *arg)
245 collector_t *this = (collector_t *)arg;
252 pthread_mutex_lock (&conns_mutex);
254 while (NULL == conns.head) {
255 pthread_cond_wait (&conn_available, &conns_mutex);
258 connection = conns.head;
259 conns.head = conns.head->next;
261 if (NULL == conns.head) {
265 pthread_mutex_unlock (&conns_mutex);
267 /* make the socket available to the global
268 * thread and connection management */
269 this->socket = connection->socket;
271 log_debug ("collect: handling connection on fd #%i",
272 fileno (this->socket));
275 /* 256 bytes ought to be enough for anybody ;-) */
276 char line[256 + 1]; /* line + '\0' */
280 if (NULL == fgets (line, sizeof (line), this->socket)) {
285 log_err ("collect: reading from socket (fd #%i) "
286 "failed: %s", fileno (this->socket),
287 sstrerror (errno, errbuf, sizeof (errbuf)));
293 if (('\n' != line[len - 1]) && ('\r' != line[len - 1])) {
294 log_warn ("collect: line too long (> %zu characters): "
295 "'%s' (truncated)", sizeof (line) - 1, line);
297 while (NULL != fgets (line, sizeof (line), this->socket))
298 if (('\n' == line[len - 1]) || ('\r' == line[len - 1]))
303 line[len - 1] = '\0';
305 log_debug ("collect: line = '%s'", line);
307 if (':' != line[1]) {
308 log_err ("collect: syntax error in line '%s'", line);
312 if ('e' == line[0]) { /* e:<type>:<bytes> */
314 char *type = strtok_r (line + 2, ":", &ptr);
315 char *tmp = strtok_r (NULL, ":", &ptr);
319 log_err ("collect: syntax error in line '%s'", line);
325 pthread_mutex_lock (&count_mutex);
326 type_list_incr (&list_count, type, 1);
327 pthread_mutex_unlock (&count_mutex);
330 pthread_mutex_lock (&size_mutex);
331 type_list_incr (&list_size, type, bytes);
332 pthread_mutex_unlock (&size_mutex);
335 else if ('s' == line[0]) { /* s:<value> */
336 pthread_mutex_lock (&score_mutex);
337 score = (score * (double)score_count + atof (line + 2))
338 / (double)(score_count + 1);
340 pthread_mutex_unlock (&score_mutex);
342 else if ('c' == line[0]) { /* c:<type1>[,<type2>,...] */
344 char *type = strtok_r (line + 2, ",", &ptr);
347 pthread_mutex_lock (&check_mutex);
348 type_list_incr (&list_check, type, 1);
349 pthread_mutex_unlock (&check_mutex);
350 } while (NULL != (type = strtok_r (NULL, ",", &ptr)));
353 log_err ("collect: unknown type '%c'", line[0]);
357 log_debug ("[thread #%5lu] shutting down connection on fd #%i",
358 pthread_self (), fileno (this->socket));
360 fclose (connection->socket);
365 pthread_mutex_lock (&available_mutex);
366 ++available_collectors;
367 pthread_mutex_unlock (&available_mutex);
369 pthread_cond_signal (&collector_available);
372 pthread_exit ((void *)0);
373 } /* static void *collect (void *) */
375 static void *open_connection (void *arg)
377 struct sockaddr_un addr;
379 char *path = (NULL == sock_file) ? SOCK_PATH : sock_file;
380 char *group = (NULL == sock_group) ? COLLECTD_GRP_NAME : sock_group;
382 /* create UNIX socket */
384 if (-1 == (connector_socket = socket (PF_UNIX, SOCK_STREAM, 0))) {
387 log_err ("socket() failed: %s",
388 sstrerror (errno, errbuf, sizeof (errbuf)));
389 pthread_exit ((void *)1);
392 addr.sun_family = AF_UNIX;
393 sstrncpy (addr.sun_path, path, (size_t)(UNIX_PATH_MAX - 1));
396 if (-1 == bind (connector_socket, (struct sockaddr *)&addr,
397 offsetof (struct sockaddr_un, sun_path)
398 + strlen(addr.sun_path))) {
401 close (connector_socket);
402 connector_socket = -1;
403 log_err ("bind() failed: %s",
404 sstrerror (errno, errbuf, sizeof (errbuf)));
405 pthread_exit ((void *)1);
409 if (-1 == listen (connector_socket, 5)) {
412 close (connector_socket);
413 connector_socket = -1;
414 log_err ("listen() failed: %s",
415 sstrerror (errno, errbuf, sizeof (errbuf)));
416 pthread_exit ((void *)1);
426 status = getgrnam_r (group, &sg, grbuf, sizeof (grbuf), &grp);
430 log_warn ("getgrnam_r (%s) failed: %s", group,
431 sstrerror (errno, errbuf, sizeof (errbuf)));
433 else if (grp == NULL)
435 log_warn ("No such group: `%s'", group);
439 status = chown (path, (uid_t) -1, grp->gr_gid);
443 log_warn ("chown (%s, -1, %i) failed: %s",
444 path, (int) grp->gr_gid,
445 sstrerror (errno, errbuf, sizeof (errbuf)));
451 if (0 != chmod (path, sock_perms)) {
453 log_warn ("chmod() failed: %s",
454 sstrerror (errno, errbuf, sizeof (errbuf)));
457 { /* initialize collector threads */
461 pthread_attr_t ptattr;
466 pthread_attr_init (&ptattr);
467 pthread_attr_setdetachstate (&ptattr, PTHREAD_CREATE_DETACHED);
469 available_collectors = max_conns;
472 (collector_t **)smalloc (max_conns * sizeof (collector_t *));
474 for (i = 0; i < max_conns; ++i) {
475 collectors[i] = (collector_t *)smalloc (sizeof (collector_t));
476 collectors[i]->socket = NULL;
478 if (0 != (err = pthread_create (&collectors[i]->thread, &ptattr,
479 collect, collectors[i]))) {
481 log_err ("pthread_create() failed: %s",
482 sstrerror (errno, errbuf, sizeof (errbuf)));
483 collectors[i]->thread = (pthread_t) 0;
487 pthread_attr_destroy (&ptattr);
495 pthread_mutex_lock (&available_mutex);
497 while (0 == available_collectors) {
498 pthread_cond_wait (&collector_available, &available_mutex);
501 --available_collectors;
503 pthread_mutex_unlock (&available_mutex);
507 if (-1 == (remote = accept (connector_socket, NULL, NULL))) {
508 if (EINTR != errno) {
511 close (connector_socket);
512 connector_socket = -1;
513 log_err ("accept() failed: %s",
514 sstrerror (errno, errbuf, sizeof (errbuf)));
515 pthread_exit ((void *)1);
518 } while (EINTR == errno);
520 connection = (conn_t *)smalloc (sizeof (conn_t));
522 connection->socket = fdopen (remote, "r");
523 connection->next = NULL;
525 if (NULL == connection->socket) {
530 pthread_mutex_lock (&conns_mutex);
532 if (NULL == conns.head) {
533 conns.head = connection;
534 conns.tail = connection;
537 conns.tail->next = connection;
538 conns.tail = conns.tail->next;
541 pthread_mutex_unlock (&conns_mutex);
543 pthread_cond_signal (&conn_available);
545 pthread_exit ((void *)0);
546 } /* static void *open_connection (void *) */
548 static int email_init (void)
552 if (0 != (err = pthread_create (&connector, NULL,
553 open_connection, NULL))) {
556 log_err ("pthread_create() failed: %s",
557 sstrerror (errno, errbuf, sizeof (errbuf)));
562 } /* int email_init */
564 static int email_shutdown (void)
570 if (connector != ((pthread_t) 0)) {
571 pthread_kill (connector, SIGTERM);
572 connector = (pthread_t) 0;
575 if (connector_socket >= 0) {
576 close (connector_socket);
577 connector_socket = -1;
580 /* don't allow any more connections to be processed */
581 pthread_mutex_lock (&conns_mutex);
583 available_collectors = 0;
585 if (collectors != NULL) {
586 for (i = 0; i < max_conns; ++i) {
587 if (collectors[i] == NULL)
590 if (collectors[i]->thread != ((pthread_t) 0)) {
591 pthread_kill (collectors[i]->thread, SIGTERM);
592 collectors[i]->thread = (pthread_t) 0;
595 if (collectors[i]->socket != NULL) {
596 fclose (collectors[i]->socket);
597 collectors[i]->socket = NULL;
600 sfree (collectors[i]);
603 } /* if (collectors != NULL) */
605 pthread_mutex_unlock (&conns_mutex);
607 for (ptr = list_count.head; NULL != ptr; ptr = ptr->next) {
612 for (ptr = list_count_copy.head; NULL != ptr; ptr = ptr->next) {
617 for (ptr = list_size.head; NULL != ptr; ptr = ptr->next) {
622 for (ptr = list_size_copy.head; NULL != ptr; ptr = ptr->next) {
627 for (ptr = list_check.head; NULL != ptr; ptr = ptr->next) {
632 for (ptr = list_check_copy.head; NULL != ptr; ptr = ptr->next) {
637 unlink ((NULL == sock_file) ? SOCK_PATH : sock_file);
642 } /* static void email_shutdown (void) */
644 static void email_submit (const char *type, const char *type_instance, gauge_t value)
647 value_list_t vl = VALUE_LIST_INIT;
649 values[0].gauge = value;
653 vl.time = time (NULL);
654 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
655 sstrncpy (vl.plugin, "email", sizeof (vl.plugin));
656 sstrncpy (vl.type, type, sizeof (vl.type));
657 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
659 plugin_dispatch_values (&vl);
660 } /* void email_submit */
662 /* Copy list l1 to list l2. l2 may partly exist already, but it is assumed
663 * that neither the order nor the name of any element of either list is
664 * changed and no elements are deleted. The values of l1 are reset to zero
665 * after they have been copied to l2. */
666 static void copy_type_list (type_list_t *l1, type_list_t *l2)
673 for (ptr1 = l1->head, ptr2 = l2->head; NULL != ptr1;
674 ptr1 = ptr1->next, last = ptr2, ptr2 = ptr2->next) {
676 ptr2 = (type_t *)smalloc (sizeof (type_t));
690 if (NULL == ptr2->name) {
691 ptr2->name = sstrdup (ptr1->name);
694 ptr2->value = ptr1->value;
700 static int email_read (void)
711 pthread_mutex_lock (&count_mutex);
713 copy_type_list (&list_count, &list_count_copy);
715 pthread_mutex_unlock (&count_mutex);
717 for (ptr = list_count_copy.head; NULL != ptr; ptr = ptr->next) {
718 email_submit ("email_count", ptr->name, ptr->value);
722 pthread_mutex_lock (&size_mutex);
724 copy_type_list (&list_size, &list_size_copy);
726 pthread_mutex_unlock (&size_mutex);
728 for (ptr = list_size_copy.head; NULL != ptr; ptr = ptr->next) {
729 email_submit ("email_size", ptr->name, ptr->value);
733 pthread_mutex_lock (&score_mutex);
736 score_count_old = score_count;
740 pthread_mutex_unlock (&score_mutex);
742 if (score_count_old > 0)
743 email_submit ("spam_score", "", score_old);
746 pthread_mutex_lock (&check_mutex);
748 copy_type_list (&list_check, &list_check_copy);
750 pthread_mutex_unlock (&check_mutex);
752 for (ptr = list_check_copy.head; NULL != ptr; ptr = ptr->next)
753 email_submit ("spam_check", ptr->name, ptr->value);
756 } /* int email_read */
758 void module_register (void)
760 plugin_register_config ("email", email_config, config_keys, config_keys_num);
761 plugin_register_init ("email", email_init);
762 plugin_register_read ("email", email_read);
763 plugin_register_shutdown ("email", email_shutdown);
764 } /* void module_register */
766 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */