1 /**
2 * collectd - src/email.c
3 * Copyright (C) 2006 Sebastian Harl
4 *
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; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Author:
20 * Sebastian Harl <sh at tokkee.org>
21 **/
23 /*
24 * This plugin communicates with a spam filter, a virus scanner or similar
25 * software using a UNIX socket and a very simple protocol:
26 *
27 * e-mail type (e.g. ham, spam, virus, ...) and size
28 * e:<type>:<bytes>
29 *
30 * spam score
31 * s:<value>
32 *
33 * successful spam checks
34 * c:<type1>[,<type2>,...]
35 */
37 #include "collectd.h"
38 #include "common.h"
39 #include "plugin.h"
41 #include "configfile.h"
43 #if HAVE_LIBPTHREAD
44 # include <pthread.h>
45 # define EMAIL_HAVE_READ 1
46 #else
47 # define EMAIL_HAVE_READ 0
48 #endif
50 #if HAVE_SYS_SELECT_H
51 # include <sys/select.h>
52 #endif /* HAVE_SYS_SELECT_H */
54 #if HAVE_SYS_SOCKET_H
55 # include <sys/socket.h>
56 #endif /* HAVE_SYS_SOCKET_H */
58 /* *sigh* glibc does not define UNIX_PATH_MAX in sys/un.h ... */
59 #if HAVE_LINUX_UN_H
60 # include <linux/un.h>
61 #elif HAVE_SYS_UN_H
62 # include <sys/un.h>
63 #endif /* HAVE_LINUX_UN_H | HAVE_SYS_UN_H */
65 #if HAVE_GRP_H
66 # include <grp.h>
67 #endif /* HAVE_GRP_H */
69 #define MODULE_NAME "email"
71 /* 256 bytes ought to be enough for anybody ;-) */
72 #define BUFSIZE 256
74 #define SOCK_PATH "/tmp/.collectd-email"
75 #define MAX_CONNS 5
76 #define MAX_CONNS_LIMIT 16384
78 /*
79 * Private data structures
80 */
81 #if EMAIL_HAVE_READ
82 /* linked list of email and check types */
83 typedef struct type {
84 char *name;
85 int value;
86 struct type *next;
87 } type_t;
89 typedef struct {
90 type_t *head;
91 type_t *tail;
92 } type_list_t;
94 /* linked list of collector thread control information */
95 typedef struct collector {
96 pthread_t thread;
98 /* socket to read data from */
99 int socket;
101 /* buffer to read data to */
102 char buffer[BUFSIZE];
103 int idx; /* current position in buffer */
105 struct collector *next;
106 } collector_t;
108 typedef struct {
109 collector_t *head;
110 collector_t *tail;
111 } collector_list_t;
112 #endif /* EMAIL_HAVE_READ */
114 /*
115 * Private variables
116 */
117 #if EMAIL_HAVE_READ
118 /* valid configuration file keys */
119 static char *config_keys[] =
120 {
121 "SocketGroup",
122 "SocketPerms",
123 "MaxConns",
124 NULL
125 };
126 static int config_keys_num = 3;
128 /* socket configuration */
129 static char *sock_group = COLLECTD_GRP_NAME;
130 static int sock_perms = S_IRWXU | S_IRWXG;
131 static int max_conns = MAX_CONNS;
133 /* state of the plugin */
134 static int disabled = 0;
136 /* thread managing "client" connections */
137 static pthread_t connector;
139 /* tell the connector thread that a collector is available */
140 static pthread_cond_t collector_available = PTHREAD_COND_INITIALIZER;
142 /* collector threads that are in use */
143 static pthread_mutex_t active_mutex = PTHREAD_MUTEX_INITIALIZER;
144 static collector_list_t active;
146 /* collector threads that are available for use */
147 static pthread_mutex_t available_mutex = PTHREAD_MUTEX_INITIALIZER;
148 static collector_list_t available;
150 static pthread_mutex_t count_mutex = PTHREAD_MUTEX_INITIALIZER;
151 static type_list_t count;
153 static pthread_mutex_t size_mutex = PTHREAD_MUTEX_INITIALIZER;
154 static type_list_t size;
156 static pthread_mutex_t score_mutex = PTHREAD_MUTEX_INITIALIZER;
157 static double score;
158 static int score_count;
160 static pthread_mutex_t check_mutex = PTHREAD_MUTEX_INITIALIZER;
161 static type_list_t check;
162 #endif /* EMAIL_HAVE_READ */
164 #define COUNT_FILE "email/email-%s.rrd"
165 static char *count_ds_def[] =
166 {
167 "DS:count:GAUGE:"COLLECTD_HEARTBEAT":0:U",
168 NULL
169 };
170 static int count_ds_num = 1;
172 #define SIZE_FILE "email/email_size-%s.rrd"
173 static char *size_ds_def[] =
174 {
175 "DS:size:GAUGE:"COLLECTD_HEARTBEAT":0:U",
176 NULL
177 };
178 static int size_ds_num = 1;
180 #define SCORE_FILE "email/spam_score.rrd"
181 static char *score_ds_def[] =
182 {
183 "DS:score:GAUGE:"COLLECTD_HEARTBEAT":U:U",
184 NULL
185 };
186 static int score_ds_num = 1;
188 #define CHECK_FILE "email/spam_check-%s.rrd"
189 static char *check_ds_def[] =
190 {
191 "DS:hits:GAUGE:"COLLECTD_HEARTBEAT":0:U",
192 NULL
193 };
194 static int check_ds_num = 1;
196 #if EMAIL_HAVE_READ
197 static int email_config (char *key, char *value)
198 {
199 if (0 == strcasecmp (key, "SocketGroup")) {
200 sock_group = sstrdup (value);
201 }
202 else if (0 == strcasecmp (key, "SocketPerms")) {
203 /* the user is responsible for providing reasonable values */
204 sock_perms = (int)strtol (value, NULL, 0);
205 }
206 else if (0 == strcasecmp (key, "MaxConns")) {
207 long int tmp = strtol (value, NULL, 0);
209 if (tmp < 1) {
210 fprintf (stderr, "email plugin: `MaxConns' was set to invalid "
211 "value %li, will use default %i.\n",
212 tmp, MAX_CONNS);
213 max_conns = MAX_CONNS;
214 }
215 else if (tmp > MAX_CONNS_LIMIT) {
216 fprintf (stderr, "email plugin: `MaxConns' was set to invalid "
217 "value %li, will use hardcoded limit %i.\n",
218 tmp, MAX_CONNS_LIMIT);
219 max_conns = MAX_CONNS_LIMIT;
220 }
221 else {
222 max_conns = (int)tmp;
223 }
224 }
225 else {
226 return -1;
227 }
228 return 0;
229 } /* static int email_config (char *, char *) */
231 /* Increment the value of the given name in the given list by incr. */
232 static void type_list_incr (type_list_t *list, char *name, int incr)
233 {
234 if (NULL == list->head) {
235 list->head = (type_t *)smalloc (sizeof (type_t));
237 list->head->name = sstrdup (name);
238 list->head->value = incr;
239 list->head->next = NULL;
241 list->tail = list->head;
242 }
243 else {
244 type_t *ptr;
246 for (ptr = list->head; NULL != ptr; ptr = ptr->next) {
247 if (0 == strcmp (name, ptr->name))
248 break;
249 }
251 if (NULL == ptr) {
252 list->tail->next = (type_t *)smalloc (sizeof (type_t));
253 list->tail = list->tail->next;
255 list->tail->name = sstrdup (name);
256 list->tail->value = incr;
257 list->tail->next = NULL;
258 }
259 else {
260 ptr->value += incr;
261 }
262 }
263 return;
264 } /* static void type_list_incr (type_list_t *, char *) */
266 /* Read a single character from the socket. If an error occurs or end-of-file
267 * is reached return '\0'. */
268 char read_char (collector_t *src)
269 {
270 char ret = '\0';
272 fd_set fdset;
274 FD_ZERO (&fdset);
275 FD_SET (src->socket, &fdset);
277 if (-1 == select (src->socket + 1, &fdset, NULL, NULL, NULL)) {
278 syslog (LOG_ERR, "select() failed: %s", strerror (errno));
279 return '\0';
280 }
282 assert (FD_ISSET (src->socket, &fdset));
284 do {
285 ssize_t len = 0;
287 errno = 0;
288 if (0 > (len = read (src->socket, (void *)&ret, 1))) {
289 if (EINTR != errno) {
290 syslog (LOG_ERR, "read() failed: %s", strerror (errno));
291 return '\0';
292 }
293 }
295 if (0 == len)
296 return '\0';
297 } while (EINTR == errno);
298 return ret;
299 } /* char read_char (collector_t *) */
301 /* Read a single line (terminated by '\n') from the the socket.
302 *
303 * The return value is zero terminated and does not contain any newline
304 * characters. In case that no complete line is available (non-blocking mode
305 * should be enabled) an empty string is returned.
306 *
307 * If an error occurs or end-of-file is reached return NULL.
308 *
309 * IMPORTANT NOTE: If there is no newline character found in BUFSIZE
310 * characters of the input stream, the line will will be ignored! By
311 * definition we should not get any longer input lines, thus this is
312 * acceptable in this case ;-) */
313 char *read_line (collector_t *src)
314 {
315 int i = 0;
316 char *ret;
318 assert (BUFSIZE > src->idx);
320 for (i = 0; i < src->idx; ++i) {
321 if ('\n' == src->buffer[i])
322 break;
323 }
325 if ('\n' != src->buffer[i]) {
326 fd_set fdset;
328 ssize_t len = 0;
330 FD_ZERO (&fdset);
331 FD_SET (src->socket, &fdset);
333 if (-1 == select (src->socket + 1, &fdset, NULL, NULL, NULL)) {
334 syslog (LOG_ERR, "select() failed: %s", strerror (errno));
335 return NULL;
336 }
338 assert (FD_ISSET (src->socket, &fdset));
340 do {
341 errno = 0;
342 if (0 > (len = read (src->socket,
343 (void *)(&(src->buffer[0]) + src->idx),
344 BUFSIZE - src->idx))) {
345 if (EINTR != errno) {
346 syslog (LOG_ERR, "read() failed: %s", strerror (errno));
347 return NULL;
348 }
349 }
351 if (0 == len)
352 return NULL;
353 } while (EINTR == errno);
355 src->idx += len;
357 for (i = src->idx - len; i < src->idx; ++i) {
358 if ('\n' == src->buffer[i])
359 break;
360 }
362 if ('\n' != src->buffer[i]) {
363 ret = (char *)smalloc (1);
365 ret[0] = '\0';
367 if (BUFSIZE == src->idx) { /* no space left in buffer */
368 while ('\n' != read_char (src))
369 /* ignore complete line */;
371 src->idx = 0;
372 }
373 return ret;
374 }
375 }
377 ret = (char *)smalloc (i + 1);
378 memcpy (ret, &(src->buffer[0]), i + 1);
379 ret[i] = '\0';
381 src->idx -= (i + 1);
383 if (0 == src->idx)
384 src->buffer[0] = '\0';
385 else
386 memmove (&(src->buffer[0]), &(src->buffer[i + 1]), src->idx);
387 return ret;
388 } /* char *read_line (collector_t *) */
390 static void *collect (void *arg)
391 {
392 collector_t *this = (collector_t *)arg;
394 int loop = 1;
396 { /* put the socket in non-blocking mode */
397 int flags = 0;
399 errno = 0;
400 if (-1 == fcntl (this->socket, F_GETFL, &flags)) {
401 syslog (LOG_ERR, "fcntl() failed: %s", strerror (errno));
402 loop = 0;
403 }
405 errno = 0;
406 if (-1 == fcntl (this->socket, F_SETFL, flags | O_NONBLOCK)) {
407 syslog (LOG_ERR, "fcntl() failed: %s", strerror (errno));
408 loop = 0;
409 }
410 }
412 while (loop) {
413 char *line = read_line (this);
415 if (NULL == line) {
416 loop = 0;
417 break;
418 }
420 if ('\0' == line[0]) {
421 free (line);
422 continue;
423 }
425 if (':' != line[1]) {
426 syslog (LOG_ERR, "email: syntax error in line '%s'", line);
427 free (line);
428 continue;
429 }
431 if ('e' == line[0]) { /* e:<type>:<bytes> */
432 char *ptr = NULL;
433 char *type = strtok_r (line + 2, ":", &ptr);
434 char *tmp = strtok_r (NULL, ":", &ptr);
435 int bytes = 0;
437 if (NULL == tmp) {
438 syslog (LOG_ERR, "email: syntax error in line '%s'", line);
439 free (line);
440 continue;
441 }
443 bytes = atoi (tmp);
445 pthread_mutex_lock (&count_mutex);
446 type_list_incr (&count, type, 1);
447 pthread_mutex_unlock (&count_mutex);
449 pthread_mutex_lock (&size_mutex);
450 type_list_incr (&size, type, bytes);
451 pthread_mutex_unlock (&size_mutex);
452 }
453 else if ('s' == line[0]) { /* s:<value> */
454 pthread_mutex_lock (&score_mutex);
455 score = (score * (double)score_count + atof (line + 2))
456 / (double)(score_count + 1);
457 ++score_count;
458 pthread_mutex_unlock (&score_mutex);
459 }
460 else if ('c' == line[0]) { /* c:<type1>[,<type2>,...] */
461 char *ptr = NULL;
462 char *type = strtok_r (line + 2, ",", &ptr);
464 do {
465 pthread_mutex_lock (&check_mutex);
466 type_list_incr (&check, type, 1);
467 pthread_mutex_unlock (&check_mutex);
468 } while (NULL != (type = strtok_r (NULL, ",", &ptr)));
469 }
470 else {
471 syslog (LOG_ERR, "email: unknown type '%c'", line[0]);
472 }
474 free (line);
475 }
477 /* put this thread back into the available list */
478 pthread_mutex_lock (&active_mutex);
479 {
480 collector_t *last;
481 collector_t *ptr;
483 last = NULL;
485 for (ptr = active.head; NULL != ptr; last = ptr, ptr = ptr->next) {
486 if (0 != pthread_equal (ptr->thread, this->thread))
487 break;
488 }
490 /* the current thread _has_ to be in the active list */
491 assert (NULL != ptr);
493 if (NULL == last) {
494 active.head = ptr->next;
495 }
496 else {
497 last->next = ptr->next;
499 if (NULL == last->next) {
500 active.tail = last;
501 }
502 }
503 }
504 pthread_mutex_unlock (&active_mutex);
506 this->next = NULL;
508 pthread_mutex_lock (&available_mutex);
510 if (NULL == available.head) {
511 available.head = this;
512 available.tail = this;
513 }
514 else {
515 available.tail->next = this;
516 available.tail = this;
517 }
519 pthread_mutex_unlock (&available_mutex);
521 pthread_cond_signal (&collector_available);
522 pthread_exit ((void *)0);
523 } /* void *collect (void *) */
525 static void *open_connection (void *arg)
526 {
527 int local = 0;
529 struct sockaddr_un addr;
531 /* create UNIX socket */
532 errno = 0;
533 if (-1 == (local = socket (PF_UNIX, SOCK_STREAM, 0))) {
534 disabled = 1;
535 syslog (LOG_ERR, "socket() failed: %s", strerror (errno));
536 pthread_exit ((void *)1);
537 }
539 addr.sun_family = AF_UNIX;
541 strncpy (addr.sun_path, SOCK_PATH, (size_t)(UNIX_PATH_MAX - 1));
542 addr.sun_path[UNIX_PATH_MAX - 1] = '\0';
543 unlink (addr.sun_path);
545 errno = 0;
546 if (-1 == bind (local, (struct sockaddr *)&addr,
547 offsetof (struct sockaddr_un, sun_path)
548 + strlen(addr.sun_path))) {
549 disabled = 1;
550 syslog (LOG_ERR, "bind() failed: %s", strerror (errno));
551 pthread_exit ((void *)1);
552 }
554 errno = 0;
555 if (-1 == listen (local, 5)) {
556 disabled = 1;
557 syslog (LOG_ERR, "listen() failed: %s", strerror (errno));
558 pthread_exit ((void *)1);
559 }
561 if ((uid_t)0 == geteuid ()) {
562 struct group *grp;
564 errno = 0;
565 if (NULL != (grp = getgrnam (sock_group))) {
566 errno = 0;
567 if (0 != chown (SOCK_PATH, (uid_t)-1, grp->gr_gid)) {
568 syslog (LOG_WARNING, "chown() failed: %s", strerror (errno));
569 }
570 }
571 else {
572 syslog (LOG_WARNING, "getgrnam() failed: %s", strerror (errno));
573 }
574 }
575 else {
576 syslog (LOG_WARNING, "not running as root");
577 }
579 errno = 0;
580 if (0 != chmod (SOCK_PATH, sock_perms)) {
581 syslog (LOG_WARNING, "chmod() failed: %s", strerror (errno));
582 }
584 { /* initialize queue of available threads */
585 int i = 0;
587 collector_t *last;
589 active.head = NULL;
590 active.tail = NULL;
592 available.head = (collector_t *)smalloc (sizeof (collector_t));
593 available.tail = available.head;
594 available.tail->next = NULL;
596 last = available.head;
598 for (i = 1; i < max_conns; ++i) {
599 last->next = (collector_t *)smalloc (sizeof (collector_t));
600 last = last->next;
601 available.tail = last;
602 available.tail->next = NULL;
603 }
604 }
606 while (1) {
607 int remote = 0;
608 int err = 0;
610 collector_t *collector;
612 pthread_attr_t ptattr;
614 pthread_mutex_lock (&available_mutex);
615 while (NULL == available.head) {
616 pthread_cond_wait (&collector_available, &available_mutex);
617 }
618 pthread_mutex_unlock (&available_mutex);
620 do {
621 errno = 0;
622 if (-1 == (remote = accept (local, NULL, NULL))) {
623 if (EINTR != errno) {
624 disabled = 1;
625 syslog (LOG_ERR, "accept() failed: %s", strerror (errno));
626 pthread_exit ((void *)1);
627 }
628 }
629 } while (EINTR == errno);
631 /* assign connection to next available thread */
632 pthread_mutex_lock (&available_mutex);
634 collector = available.head;
635 collector->socket = remote;
637 if (available.head == available.tail) {
638 available.head = NULL;
639 available.tail = NULL;
640 }
641 else {
642 available.head = available.head->next;
643 }
645 pthread_mutex_unlock (&available_mutex);
647 collector->idx = 0;
648 collector->next = NULL;
650 pthread_attr_init (&ptattr);
651 pthread_attr_setdetachstate (&ptattr, PTHREAD_CREATE_DETACHED);
653 if (0 == (err = pthread_create (&collector->thread, &ptattr, collect,
654 (void *)collector))) {
655 pthread_mutex_lock (&active_mutex);
657 if (NULL == active.head) {
658 active.head = collector;
659 active.tail = collector;
660 }
661 else {
662 active.tail->next = collector;
663 active.tail = collector;
664 }
666 pthread_mutex_unlock (&active_mutex);
667 }
668 else {
669 pthread_mutex_lock (&available_mutex);
671 if (NULL == available.head) {
672 available.head = collector;
673 available.tail = collector;
674 }
675 else {
676 available.tail->next = collector;
677 available.tail = collector;
678 }
680 pthread_mutex_unlock (&available_mutex);
682 close (remote);
683 syslog (LOG_ERR, "pthread_create() failed: %s", strerror (err));
684 }
686 pthread_attr_destroy (&ptattr);
687 }
688 pthread_exit ((void *)0);
689 } /* void *open_connection (void *) */
690 #endif /* EMAIL_HAVE_READ */
692 static void email_init (void)
693 {
694 #if EMAIL_HAVE_READ
695 int err = 0;
697 if (0 != (err = pthread_create (&connector, NULL,
698 open_connection, NULL))) {
699 disabled = 1;
700 syslog (LOG_ERR, "pthread_create() failed: %s", strerror (err));
701 return;
702 }
703 #endif /* EMAIL_HAVE_READ */
704 return;
705 } /* static void email_init (void) */
707 static void count_write (char *host, char *inst, char *val)
708 {
709 char file[BUFSIZE] = "";
710 int len = 0;
712 len = snprintf (file, BUFSIZE, COUNT_FILE, inst);
713 if ((len < 0) || (len >= BUFSIZE))
714 return;
716 rrd_update_file (host, file, val, count_ds_def, count_ds_num);
717 return;
718 } /* static void email_write (char *host, char *inst, char *val) */
720 static void size_write (char *host, char *inst, char *val)
721 {
722 char file[BUFSIZE] = "";
723 int len = 0;
725 len = snprintf (file, BUFSIZE, SIZE_FILE, inst);
726 if ((len < 0) || (len >= BUFSIZE))
727 return;
729 rrd_update_file (host, file, val, size_ds_def, size_ds_num);
730 return;
731 } /* static void size_write (char *host, char *inst, char *val) */
733 static void score_write (char *host, char *inst, char *val)
734 {
735 rrd_update_file (host, SCORE_FILE, val, score_ds_def, score_ds_num);
736 return;
737 } /* static void score_write (char *host, char *inst, char *val) */
739 static void check_write (char *host, char *inst, char *val)
740 {
741 char file[BUFSIZE] = "";
742 int len = 0;
744 len = snprintf (file, BUFSIZE, CHECK_FILE, inst);
745 if ((len < 0) || (len >= BUFSIZE))
746 return;
748 rrd_update_file (host, file, val, check_ds_def, check_ds_num);
749 return;
750 } /* static void check_write (char *host, char *inst, char *val) */
752 #if EMAIL_HAVE_READ
753 static void type_submit (char *plugin, char *inst, int value)
754 {
755 char buf[BUFSIZE] = "";
756 int len = 0;
758 if (0 == value)
759 return;
761 len = snprintf (buf, BUFSIZE, "%u:%i", (unsigned int)curtime, value);
762 if ((len < 0) || (len >= BUFSIZE))
763 return;
765 plugin_submit (plugin, inst, buf);
766 return;
767 } /* static void type_submit (char *, char *, int) */
769 static void score_submit (double value)
770 {
771 char buf[BUFSIZE] = "";
772 int len = 0;
774 if (0.0 == value)
775 return;
777 len = snprintf (buf, BUFSIZE, "%u:%.2f", (unsigned int)curtime, value);
778 if ((len < 0) || (len >= BUFSIZE))
779 return;
781 plugin_submit ("email_spam_score", NULL, buf);
782 return;
783 }
785 static void email_read (void)
786 {
787 type_t *ptr;
789 if (disabled)
790 return;
792 pthread_mutex_lock (&count_mutex);
794 for (ptr = count.head; NULL != ptr; ptr = ptr->next) {
795 type_submit ("email_count", ptr->name, ptr->value);
796 ptr->value = 0;
797 }
799 pthread_mutex_unlock (&count_mutex);
801 pthread_mutex_lock (&size_mutex);
803 for (ptr = size.head; NULL != ptr; ptr = ptr->next) {
804 type_submit ("email_size", ptr->name, ptr->value);
805 ptr->value = 0;
806 }
808 pthread_mutex_unlock (&size_mutex);
810 pthread_mutex_lock (&score_mutex);
812 score_submit (score);
813 score = 0.0;
814 score_count = 0;
816 pthread_mutex_unlock (&score_mutex);
818 pthread_mutex_lock (&check_mutex);
820 for (ptr = check.head; NULL != ptr; ptr = ptr->next) {
821 type_submit ("email_spam_check", ptr->name, ptr->value);
822 ptr->value = 0;
823 }
825 pthread_mutex_unlock (&check_mutex);
826 return;
827 } /* static void read (void) */
828 #else /* if !EMAIL_HAVE_READ */
829 # define email_read NULL
830 #endif
832 void module_register (void)
833 {
834 plugin_register (MODULE_NAME, email_init, email_read, NULL);
835 plugin_register ("email_count", NULL, NULL, count_write);
836 plugin_register ("email_size", NULL, NULL, size_write);
837 plugin_register ("email_spam_score", NULL, NULL, score_write);
838 plugin_register ("email_spam_check", NULL, NULL, check_write);
839 #if EMAIL_HAVE_READ
840 cf_register (MODULE_NAME, email_config, config_keys, config_keys_num);
841 #endif /* EMAIL_HAVE_READ */
842 return;
843 } /* void module_register (void) */
845 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */