2 * collectd - src/connectivity.c
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
24 * Andrew Bays <abays at redhat.com>
25 * Aneesh Puttur <aputtur at redhat.com>
32 #include "utils_complain.h"
33 #include "utils_ignorelist.h"
35 #include <asm/types.h>
38 #include <netinet/in.h>
42 #include <sys/socket.h>
45 #include <libmnl/libmnl.h>
46 #include <linux/netlink.h>
47 #include <linux/rtnetlink.h>
49 #include <yajl/yajl_common.h>
50 #include <yajl/yajl_gen.h>
51 #if HAVE_YAJL_YAJL_VERSION_H
52 #include <yajl/yajl_version.h>
54 #if defined(YAJL_MAJOR) && (YAJL_MAJOR > 1)
55 #define HAVE_YAJL_V2 1
58 #define MYPROTO NETLINK_ROUTE
60 #define LINK_STATE_DOWN 0
61 #define LINK_STATE_UP 1
62 #define LINK_STATE_UNKNOWN 2
64 #define CONNECTIVITY_DOMAIN_FIELD "domain"
65 #define CONNECTIVITY_DOMAIN_VALUE "stateChange"
66 #define CONNECTIVITY_EVENT_ID_FIELD "eventId"
67 #define CONNECTIVITY_EVENT_NAME_FIELD "eventName"
68 #define CONNECTIVITY_EVENT_NAME_DOWN_VALUE "down"
69 #define CONNECTIVITY_EVENT_NAME_UP_VALUE "up"
70 #define CONNECTIVITY_LAST_EPOCH_MICROSEC_FIELD "lastEpochMicrosec"
71 #define CONNECTIVITY_PRIORITY_FIELD "priority"
72 #define CONNECTIVITY_PRIORITY_VALUE "high"
73 #define CONNECTIVITY_REPORTING_ENTITY_NAME_FIELD "reportingEntityName"
74 #define CONNECTIVITY_REPORTING_ENTITY_NAME_VALUE "collectd connectivity plugin"
75 #define CONNECTIVITY_SEQUENCE_FIELD "sequence"
76 #define CONNECTIVITY_SEQUENCE_VALUE "0"
77 #define CONNECTIVITY_SOURCE_NAME_FIELD "sourceName"
78 #define CONNECTIVITY_START_EPOCH_MICROSEC_FIELD "startEpochMicrosec"
79 #define CONNECTIVITY_VERSION_FIELD "version"
80 #define CONNECTIVITY_VERSION_VALUE "1.0"
82 #define CONNECTIVITY_NEW_STATE_FIELD "newState"
83 #define CONNECTIVITY_NEW_STATE_FIELD_DOWN_VALUE "outOfService"
84 #define CONNECTIVITY_NEW_STATE_FIELD_UP_VALUE "inService"
85 #define CONNECTIVITY_OLD_STATE_FIELD "oldState"
86 #define CONNECTIVITY_OLD_STATE_FIELD_DOWN_VALUE "outOfService"
87 #define CONNECTIVITY_OLD_STATE_FIELD_UP_VALUE "inService"
88 #define CONNECTIVITY_STATE_CHANGE_FIELDS_FIELD "stateChangeFields"
89 #define CONNECTIVITY_STATE_CHANGE_FIELDS_VERSION_FIELD \
90 "stateChangeFieldsVersion"
91 #define CONNECTIVITY_STATE_CHANGE_FIELDS_VERSION_VALUE "1.0"
92 #define CONNECTIVITY_STATE_INTERFACE_FIELD "stateInterface"
98 struct interface_list_s {
102 uint32_t prev_status;
104 long long unsigned int timestamp;
106 struct interface_list_s *next;
108 typedef struct interface_list_s interface_list_t;
114 static ignorelist_t *ignorelist = NULL;
116 static interface_list_t *interface_list_head = NULL;
117 static int monitor_all_interfaces = 1;
119 static int connectivity_netlink_thread_loop = 0;
120 static int connectivity_netlink_thread_error = 0;
121 static pthread_t connectivity_netlink_thread_id;
122 static int connectivity_dequeue_thread_loop = 0;
123 static int connectivity_dequeue_thread_error = 0;
124 static pthread_t connectivity_dequeue_thread_id;
125 static pthread_mutex_t connectivity_threads_lock = PTHREAD_MUTEX_INITIALIZER;
126 static pthread_mutex_t connectivity_data_lock = PTHREAD_MUTEX_INITIALIZER;
127 static pthread_cond_t connectivity_cond = PTHREAD_COND_INITIALIZER;
128 // static struct mnl_socket *sock;
129 static int nl_sock = -1;
130 static int event_id = 0;
131 static int unsent_statuses = 0;
133 static const char *config_keys[] = {"Interface", "IgnoreSelected"};
134 static int config_keys_num = STATIC_ARRAY_SIZE(config_keys);
141 connectivity_dispatch_notification(const char *interface, const char *type,
142 gauge_t value, gauge_t old_value,
143 long long unsigned int timestamp);
149 static int gen_message_payload(int state, int old_state, const char *interface,
150 long long unsigned int timestamp, char **buf) {
151 const unsigned char *buf2;
153 char json_str[DATA_MAX_NAME_LEN];
155 #if !defined(HAVE_YAJL_V2)
156 yajl_gen_config conf = {};
163 g = yajl_gen_alloc(NULL);
164 yajl_gen_config(g, yajl_gen_beautify, 0);
167 g = yajl_gen_alloc(&conf, NULL);
172 // *** BEGIN common event header ***
174 if (yajl_gen_map_open(g) != yajl_gen_status_ok)
178 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_DOMAIN_FIELD,
179 strlen(CONNECTIVITY_DOMAIN_FIELD)) != yajl_gen_status_ok)
182 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_DOMAIN_VALUE,
183 strlen(CONNECTIVITY_DOMAIN_VALUE)) != yajl_gen_status_ok)
187 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_EVENT_ID_FIELD,
188 strlen(CONNECTIVITY_EVENT_ID_FIELD)) !=
192 event_id = event_id + 1;
193 int event_id_len = sizeof(char) * sizeof(int) * 4 + 1;
194 memset(json_str, '\0', DATA_MAX_NAME_LEN);
195 snprintf(json_str, event_id_len, "%d", event_id);
197 if (yajl_gen_number(g, json_str, strlen(json_str)) != yajl_gen_status_ok) {
202 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_EVENT_NAME_FIELD,
203 strlen(CONNECTIVITY_EVENT_NAME_FIELD)) !=
207 int event_name_len = 0;
208 event_name_len = event_name_len + strlen(interface); // interface name
209 event_name_len = event_name_len + (state == 0 ? 4 : 2); // "down" or "up"
211 event_name_len + 12; // "interface", 2 spaces and null-terminator
212 memset(json_str, '\0', DATA_MAX_NAME_LEN);
213 snprintf(json_str, event_name_len, "interface %s %s", interface,
214 (state == 0 ? CONNECTIVITY_EVENT_NAME_DOWN_VALUE
215 : CONNECTIVITY_EVENT_NAME_UP_VALUE));
217 if (yajl_gen_string(g, (u_char *)json_str, strlen(json_str)) !=
218 yajl_gen_status_ok) {
223 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_LAST_EPOCH_MICROSEC_FIELD,
224 strlen(CONNECTIVITY_LAST_EPOCH_MICROSEC_FIELD)) !=
228 int last_epoch_microsec_len =
229 sizeof(char) * sizeof(long long unsigned int) * 4 + 1;
230 memset(json_str, '\0', DATA_MAX_NAME_LEN);
231 snprintf(json_str, last_epoch_microsec_len, "%llu",
232 (long long unsigned int)CDTIME_T_TO_US(cdtime()));
234 if (yajl_gen_number(g, json_str, strlen(json_str)) != yajl_gen_status_ok) {
239 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_PRIORITY_FIELD,
240 strlen(CONNECTIVITY_PRIORITY_FIELD)) !=
244 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_PRIORITY_VALUE,
245 strlen(CONNECTIVITY_PRIORITY_VALUE)) !=
249 // reportingEntityName
250 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_REPORTING_ENTITY_NAME_FIELD,
251 strlen(CONNECTIVITY_REPORTING_ENTITY_NAME_FIELD)) !=
255 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_REPORTING_ENTITY_NAME_VALUE,
256 strlen(CONNECTIVITY_REPORTING_ENTITY_NAME_VALUE)) !=
261 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_SEQUENCE_FIELD,
262 strlen(CONNECTIVITY_SEQUENCE_FIELD)) !=
266 if (yajl_gen_number(g, CONNECTIVITY_SEQUENCE_VALUE,
267 strlen(CONNECTIVITY_SEQUENCE_VALUE)) !=
272 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_SOURCE_NAME_FIELD,
273 strlen(CONNECTIVITY_SOURCE_NAME_FIELD)) !=
277 if (yajl_gen_string(g, (u_char *)interface, strlen(interface)) !=
281 // startEpochMicrosec
282 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_START_EPOCH_MICROSEC_FIELD,
283 strlen(CONNECTIVITY_START_EPOCH_MICROSEC_FIELD)) !=
287 int start_epoch_microsec_len =
288 sizeof(char) * sizeof(long long unsigned int) * 4 + 1;
289 memset(json_str, '\0', DATA_MAX_NAME_LEN);
290 snprintf(json_str, start_epoch_microsec_len, "%llu",
291 (long long unsigned int)timestamp);
293 if (yajl_gen_number(g, json_str, strlen(json_str)) != yajl_gen_status_ok) {
298 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_VERSION_FIELD,
299 strlen(CONNECTIVITY_VERSION_FIELD)) != yajl_gen_status_ok)
302 if (yajl_gen_number(g, CONNECTIVITY_VERSION_VALUE,
303 strlen(CONNECTIVITY_VERSION_VALUE)) != yajl_gen_status_ok)
306 // *** END common event header ***
308 // *** BEGIN state change fields ***
310 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_STATE_CHANGE_FIELDS_FIELD,
311 strlen(CONNECTIVITY_STATE_CHANGE_FIELDS_FIELD)) !=
315 if (yajl_gen_map_open(g) != yajl_gen_status_ok)
319 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_NEW_STATE_FIELD,
320 strlen(CONNECTIVITY_NEW_STATE_FIELD)) !=
325 (state == 0 ? strlen(CONNECTIVITY_NEW_STATE_FIELD_DOWN_VALUE)
326 : strlen(CONNECTIVITY_NEW_STATE_FIELD_UP_VALUE));
329 g, (u_char *)(state == 0 ? CONNECTIVITY_NEW_STATE_FIELD_DOWN_VALUE
330 : CONNECTIVITY_NEW_STATE_FIELD_UP_VALUE),
331 new_state_len) != yajl_gen_status_ok)
335 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_OLD_STATE_FIELD,
336 strlen(CONNECTIVITY_OLD_STATE_FIELD)) !=
341 (old_state == 0 ? strlen(CONNECTIVITY_OLD_STATE_FIELD_DOWN_VALUE)
342 : strlen(CONNECTIVITY_OLD_STATE_FIELD_UP_VALUE));
345 g, (u_char *)(old_state == 0 ? CONNECTIVITY_OLD_STATE_FIELD_DOWN_VALUE
346 : CONNECTIVITY_OLD_STATE_FIELD_UP_VALUE),
347 old_state_len) != yajl_gen_status_ok)
350 // stateChangeFieldsVersion
351 if (yajl_gen_string(g,
352 (u_char *)CONNECTIVITY_STATE_CHANGE_FIELDS_VERSION_FIELD,
353 strlen(CONNECTIVITY_STATE_CHANGE_FIELDS_VERSION_FIELD)) !=
357 if (yajl_gen_number(g, CONNECTIVITY_STATE_CHANGE_FIELDS_VERSION_VALUE,
358 strlen(CONNECTIVITY_STATE_CHANGE_FIELDS_VERSION_VALUE)) !=
363 if (yajl_gen_string(g, (u_char *)CONNECTIVITY_STATE_INTERFACE_FIELD,
364 strlen(CONNECTIVITY_STATE_INTERFACE_FIELD)) !=
368 if (yajl_gen_string(g, (u_char *)interface, strlen(interface)) !=
372 if (yajl_gen_map_close(g) != yajl_gen_status_ok)
375 // *** END state change fields ***
377 if (yajl_gen_map_close(g) != yajl_gen_status_ok)
380 if (yajl_gen_get_buf(g, &buf2, &len) != yajl_gen_status_ok)
383 *buf = strdup((char *)buf2);
386 ERROR("connectivity plugin: strdup failed during gen_message_payload: %s",
397 ERROR("connectivity plugin: gen_message_payload failed to generate JSON");
401 static interface_list_t *add_interface(const char *interface, int status,
403 interface_list_t *il = calloc(1, sizeof(*il));
406 ERROR("connectivity plugin: calloc failed during add_interface: %s",
411 char *interface2 = strdup(interface);
412 if (interface2 == NULL) {
414 ERROR("connectivity plugin: strdup failed during add_interface: %s",
419 il->interface = interface2;
421 il->prev_status = prev_status;
422 il->timestamp = (long long unsigned int)CDTIME_T_TO_US(cdtime());
424 il->next = interface_list_head;
425 interface_list_head = il;
427 DEBUG("connectivity plugin: added interface %s", interface2);
432 static int connectivity_link_state(struct nlmsghdr *msg) {
433 struct ifinfomsg *ifi = mnl_nlmsg_get_payload(msg);
436 pthread_mutex_lock(&connectivity_data_lock);
438 interface_list_t *il = NULL;
440 /* Scan attribute list for device name. */
441 mnl_attr_for_each(attr, msg, sizeof(*ifi)) {
442 if (mnl_attr_get_type(attr) != IFLA_IFNAME)
445 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) {
446 ERROR("connectivity plugin: connectivity_link_state: IFLA_IFNAME "
449 pthread_mutex_unlock(&connectivity_data_lock);
453 const char *dev = mnl_attr_get_str(attr);
455 // Check the list of interfaces we should monitor, if we've chosen
456 // a subset. If we don't care about this one, abort.
457 if (ignorelist_match(ignorelist, dev) != 0) {
458 DEBUG("connectivity plugin: Ignoring link state change for unmonitored "
464 for (il = interface_list_head; il != NULL; il = il->next)
465 if (strcmp(dev, il->interface) == 0)
468 uint32_t prev_status;
471 // We haven't encountered this interface yet, so add it to the linked list
472 il = add_interface(dev, LINK_STATE_UNKNOWN, LINK_STATE_UNKNOWN);
475 ERROR("connectivity plugin: unable to add interface %s during "
476 "connectivity_link_state",
482 prev_status = il->status;
484 ((ifi->ifi_flags & IFF_RUNNING) ? LINK_STATE_UP : LINK_STATE_DOWN);
485 il->timestamp = (long long unsigned int)CDTIME_T_TO_US(cdtime());
487 // If the new status is different than the previous status,
488 // store the previous status and set sent to zero, and set the
489 // global flag to indicate there are statuses to dispatch
490 if (il->status != prev_status) {
491 il->prev_status = prev_status;
496 DEBUG("connectivity plugin (%llu): Interface %s status is now %s",
497 il->timestamp, dev, ((ifi->ifi_flags & IFF_RUNNING) ? "UP" : "DOWN"));
499 // no need to loop again, we found the interface name attr
500 // (otherwise the first if-statement in the loop would
501 // have moved us on with 'continue')
505 pthread_mutex_unlock(&connectivity_data_lock);
510 static int msg_handler(struct nlmsghdr *msg) {
511 switch (msg->nlmsg_type) {
517 // Not of interest in current version
520 connectivity_link_state(msg);
523 ERROR("connectivity plugin: msg_handler: Unknown netlink nlmsg_type %d",
530 static int read_event(int nl, int (*msg_handler)(struct nlmsghdr *)) {
532 int recv_flags = MSG_DONTWAIT;
540 pthread_mutex_lock(&connectivity_threads_lock);
542 if (connectivity_netlink_thread_loop <= 0) {
543 pthread_mutex_unlock(&connectivity_threads_lock);
547 pthread_mutex_unlock(&connectivity_threads_lock);
549 int status = recv(nl, buf, sizeof(buf), recv_flags);
553 // If there were no more messages to drain from the socket,
554 // then signal the dequeue thread and allow it to dispatch
555 // any saved interface status changes. Then continue, but
556 // block and wait for new messages
557 if (errno == EWOULDBLOCK || errno == EAGAIN) {
558 pthread_cond_signal(&connectivity_cond);
564 /* Anything else is an error */
565 ERROR("connectivity plugin: read_event: Error recv: %d", status);
569 // Message received successfully, so we'll stop blocking on the
570 // receive call for now (until we get a "would block" error, which
571 // will be handled above)
572 recv_flags = MSG_DONTWAIT;
575 DEBUG("connectivity plugin: read_event: EOF");
578 /* We need to handle more than one message per 'recvmsg' */
579 for (struct nlmsghdr *h = (struct nlmsghdr *)buf;
580 NLMSG_OK(h, (unsigned int)status); h = NLMSG_NEXT(h, status)) {
582 if (h->nlmsg_type == NLMSG_DONE)
585 /* Message is some kind of error */
586 if (h->nlmsg_type == NLMSG_ERROR) {
587 ERROR("connectivity plugin: read_event: Message is an error");
591 /* Call message handler */
593 ret = (*msg_handler)(h);
595 ERROR("connectivity plugin: read_event: Message handler error %d",
600 ERROR("connectivity plugin: read_event: Error NULL message handler");
609 // NOTE: Caller MUST hold connectivity_data_lock when calling this function
610 static void send_interface_status() {
611 for (interface_list_t *il = interface_list_head; il != NULL;
612 il = il->next) /* {{{ */
615 uint32_t prev_status;
619 prev_status = il->prev_status;
622 if (status != prev_status && sent == 0) {
623 connectivity_dispatch_notification(il->interface, "gauge", status,
624 prev_status, il->timestamp);
627 } /* }}} for (il = interface_list_head; il != NULL; il = il->next) */
632 static int read_interface_status() /* {{{ */
634 pthread_mutex_lock(&connectivity_data_lock);
636 if (!unsent_statuses)
637 pthread_cond_wait(&connectivity_cond, &connectivity_data_lock);
639 send_interface_status();
641 pthread_mutex_unlock(&connectivity_data_lock);
644 } /* }}} int *read_interface_status */
646 static void *connectivity_netlink_thread(void *arg) /* {{{ */
648 pthread_mutex_lock(&connectivity_threads_lock);
650 while (connectivity_netlink_thread_loop > 0) {
651 pthread_mutex_unlock(&connectivity_threads_lock);
653 int status = read_event(nl_sock, msg_handler);
655 pthread_mutex_lock(&connectivity_threads_lock);
658 connectivity_netlink_thread_error = 1;
661 } /* while (connectivity_netlink_thread_loop > 0) */
663 pthread_mutex_unlock(&connectivity_threads_lock);
666 } /* }}} void *connectivity_netlink_thread */
668 static void *connectivity_dequeue_thread(void *arg) /* {{{ */
670 pthread_mutex_lock(&connectivity_threads_lock);
672 while (connectivity_dequeue_thread_loop > 0) {
673 pthread_mutex_unlock(&connectivity_threads_lock);
675 int status = read_interface_status();
677 pthread_mutex_lock(&connectivity_threads_lock);
680 connectivity_dequeue_thread_error = 1;
683 } /* while (connectivity_dequeue_thread_loop > 0) */
685 pthread_mutex_unlock(&connectivity_threads_lock);
688 } /* }}} void *connectivity_dequeue_thread */
690 static int nl_connect() {
691 struct sockaddr_nl sa_nl = {
692 .nl_family = AF_NETLINK, .nl_groups = RTMGRP_LINK, .nl_pid = getpid(),
695 nl_sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
697 ERROR("connectivity plugin: socket open failed: %s", STRERRNO);
701 int rc = bind(nl_sock, (struct sockaddr *)&sa_nl, sizeof(sa_nl));
703 ERROR("connectivity plugin: socket bind failed: %s", STRERRNO);
711 static int start_netlink_thread(void) /* {{{ */
715 pthread_mutex_lock(&connectivity_threads_lock);
717 if (connectivity_netlink_thread_loop != 0) {
718 pthread_mutex_unlock(&connectivity_threads_lock);
722 connectivity_netlink_thread_loop = 1;
723 connectivity_netlink_thread_error = 0;
726 status = nl_connect();
729 pthread_mutex_unlock(&connectivity_threads_lock);
734 status = plugin_thread_create(&connectivity_netlink_thread_id,
735 /* attr = */ NULL, connectivity_netlink_thread,
736 /* arg = */ (void *)0, "connectivity");
738 connectivity_netlink_thread_loop = 0;
739 ERROR("connectivity plugin: Starting thread failed.");
740 pthread_mutex_unlock(&connectivity_threads_lock);
742 int status2 = close(nl_sock);
745 ERROR("connectivity plugin: failed to close socket %d: %d (%s)", nl_sock,
753 pthread_mutex_unlock(&connectivity_threads_lock);
758 static int start_dequeue_thread(void) /* {{{ */
760 pthread_mutex_lock(&connectivity_threads_lock);
762 if (connectivity_dequeue_thread_loop != 0) {
763 pthread_mutex_unlock(&connectivity_threads_lock);
767 connectivity_dequeue_thread_loop = 1;
768 connectivity_dequeue_thread_error = 0;
771 plugin_thread_create(&connectivity_dequeue_thread_id,
772 /* attr = */ NULL, connectivity_dequeue_thread,
773 /* arg = */ (void *)0, "connectivity");
775 connectivity_dequeue_thread_loop = 0;
776 ERROR("connectivity plugin: Starting dequeue thread failed.");
777 pthread_mutex_unlock(&connectivity_threads_lock);
781 pthread_mutex_unlock(&connectivity_threads_lock);
784 } /* }}} int start_dequeue_thread */
786 static int start_threads(void) /* {{{ */
788 int status = start_netlink_thread();
789 int status2 = start_dequeue_thread();
795 } /* }}} int start_threads */
797 static int stop_netlink_thread(int shutdown) /* {{{ */
799 int socket_status, thread_stratus;
802 socket_status = close(nl_sock);
803 if (socket_status != 0) {
804 ERROR("connectivity plugin: failed to close socket %d: %d (%s)", nl_sock,
805 socket_status, STRERRNO);
811 pthread_mutex_lock(&connectivity_threads_lock);
813 if (connectivity_netlink_thread_loop == 0) {
814 pthread_mutex_unlock(&connectivity_threads_lock);
815 // Thread has already been terminated, nothing more to attempt
816 return socket_status;
819 // Set thread termination status
820 connectivity_netlink_thread_loop = 0;
821 pthread_mutex_unlock(&connectivity_threads_lock);
823 // Let threads waiting on access to the interface list know to move
824 // on such that they'll see the threads termination status
825 pthread_cond_broadcast(&connectivity_cond);
828 // Since the thread is blocking, calling pthread_join
829 // doesn't actually succeed in stopping it. It will stick around
830 // until a NETLINK message is received on the socket (at which
831 // it will realize that "connectivity_netlink_thread_loop" is 0 and will
832 // break out of the read loop and be allowed to die). This is
833 // fine when the process isn't supposed to be exiting, but in
834 // the case of a process shutdown, we don't want to have an
835 // idle thread hanging around. Calling pthread_cancel here in
836 // the case of a shutdown is just assures that the thread is
837 // gone and that the process has been fully terminated.
839 DEBUG("connectivity plugin: Canceling netlink thread for process shutdown");
841 thread_stratus = pthread_cancel(connectivity_netlink_thread_id);
843 if (thread_stratus != 0 && thread_stratus != ESRCH) {
844 ERROR("connectivity plugin: Unable to cancel netlink thread: %d",
851 pthread_join(connectivity_netlink_thread_id, /* return = */ NULL);
852 if (thread_stratus != 0 && thread_stratus != ESRCH) {
853 ERROR("connectivity plugin: Stopping netlink thread failed: %d",
860 pthread_mutex_lock(&connectivity_threads_lock);
861 memset(&connectivity_netlink_thread_id, 0,
862 sizeof(connectivity_netlink_thread_id));
863 connectivity_netlink_thread_error = 0;
864 pthread_mutex_unlock(&connectivity_threads_lock);
866 DEBUG("connectivity plugin: Finished requesting stop of netlink thread");
868 if (socket_status != 0)
869 return socket_status;
871 return thread_stratus;
874 static int stop_dequeue_thread(int shutdown) /* {{{ */
878 pthread_mutex_lock(&connectivity_threads_lock);
880 if (connectivity_dequeue_thread_loop == 0) {
881 pthread_mutex_unlock(&connectivity_threads_lock);
885 // Set thread termination status
886 connectivity_dequeue_thread_loop = 0;
887 pthread_mutex_unlock(&connectivity_threads_lock);
889 // Let threads waiting on access to the interface list know to move
890 // on such that they'll see the threads termination status
891 pthread_cond_broadcast(&connectivity_cond);
894 // Calling pthread_cancel here in
895 // the case of a shutdown just assures that the thread is
896 // gone and that the process has been fully terminated.
898 DEBUG("connectivity plugin: Canceling dequeue thread for process shutdown");
900 status = pthread_cancel(connectivity_dequeue_thread_id);
902 if (status != 0 && status != ESRCH) {
903 ERROR("connectivity plugin: Unable to cancel dequeue thread: %d", status);
908 status = pthread_join(connectivity_dequeue_thread_id, /* return = */ NULL);
909 if (status != 0 && status != ESRCH) {
910 ERROR("connectivity plugin: Stopping dequeue thread failed.");
916 pthread_mutex_lock(&connectivity_threads_lock);
917 memset(&connectivity_dequeue_thread_id, 0,
918 sizeof(connectivity_dequeue_thread_id));
919 connectivity_dequeue_thread_error = 0;
920 pthread_mutex_unlock(&connectivity_threads_lock);
922 DEBUG("connectivity plugin: Finished requesting stop of dequeue thread");
925 } /* }}} int stop_dequeue_thread */
927 static int stop_threads(int shutdown) /* {{{ */
929 int status = stop_netlink_thread(shutdown);
930 int status2 = stop_dequeue_thread(shutdown);
936 } /* }}} int stop_threads */
938 static int connectivity_init(void) /* {{{ */
940 if (monitor_all_interfaces) {
941 NOTICE("connectivity plugin: No interfaces have been selected, so all will "
945 return (start_threads());
946 } /* }}} int connectivity_init */
948 static int connectivity_config(const char *key, const char *value) /* {{{ */
950 if (ignorelist == NULL) {
951 ignorelist = ignorelist_create(/* invert = */ 1);
954 if (strcasecmp(key, "Interface") == 0) {
955 ignorelist_add(ignorelist, value);
956 monitor_all_interfaces = 0;
957 } else if (strcasecmp(key, "IgnoreSelected") == 0) {
961 ignorelist_set_invert(ignorelist, invert);
967 } /* }}} int connectivity_config */
970 connectivity_dispatch_notification(const char *interface, const char *type,
971 gauge_t value, gauge_t old_value,
972 long long unsigned int timestamp) {
975 NOTIF_FAILURE, cdtime(), "", "", "connectivity", "", "", "", NULL};
977 if (value == LINK_STATE_UP)
978 n.severity = NOTIF_OKAY;
980 sstrncpy(n.host, hostname_g, sizeof(n.host));
981 sstrncpy(n.plugin_instance, interface, sizeof(n.plugin_instance));
982 sstrncpy(n.type, "gauge", sizeof(n.type));
983 sstrncpy(n.type_instance, "interface_status", sizeof(n.type_instance));
985 gen_message_payload(value, old_value, interface, timestamp, &buf);
987 notification_meta_t *m = calloc(1, sizeof(*m));
991 ERROR("connectivity plugin: unable to allocate metadata: %s", STRERRNO);
995 sstrncpy(m->name, "ves", sizeof(m->name));
996 m->nm_value.nm_string = sstrdup(buf);
997 m->type = NM_TYPE_STRING;
1000 DEBUG("connectivity plugin: notification message: %s",
1001 n.meta->nm_value.nm_string);
1003 DEBUG("connectivity plugin: dispatching state %d for interface %s",
1004 (int)value, interface);
1006 plugin_dispatch_notification(&n);
1007 plugin_notification_meta_free(n.meta);
1009 // strdup'd in gen_message_payload
1014 static int connectivity_read(void) /* {{{ */
1016 pthread_mutex_lock(&connectivity_threads_lock);
1018 if (connectivity_netlink_thread_error != 0) {
1020 pthread_mutex_unlock(&connectivity_threads_lock);
1022 ERROR("connectivity plugin: The netlink thread had a problem. Restarting "
1025 stop_netlink_thread(0);
1027 for (interface_list_t *il = interface_list_head; il != NULL;
1029 il->status = LINK_STATE_UNKNOWN;
1030 il->prev_status = LINK_STATE_UNKNOWN;
1034 start_netlink_thread();
1037 } /* if (connectivity_netlink_thread_error != 0) */
1039 if (connectivity_dequeue_thread_error != 0) {
1041 pthread_mutex_unlock(&connectivity_threads_lock);
1043 ERROR("connectivity plugin: The dequeue thread had a problem. Restarting "
1046 stop_dequeue_thread(0);
1048 start_dequeue_thread();
1051 } /* if (connectivity_dequeue_thread_error != 0) */
1053 pthread_mutex_unlock(&connectivity_threads_lock);
1056 } /* }}} int connectivity_read */
1058 static int connectivity_shutdown(void) /* {{{ */
1060 DEBUG("connectivity plugin: Shutting down thread.");
1061 if (stop_threads(1) < 0)
1064 interface_list_t *il = interface_list_head;
1065 while (il != NULL) {
1066 interface_list_t *il_next;
1070 sfree(il->interface);
1076 ignorelist_free(ignorelist);
1079 } /* }}} int connectivity_shutdown */
1081 void module_register(void) {
1082 plugin_register_config("connectivity", connectivity_config, config_keys,
1084 plugin_register_init("connectivity", connectivity_init);
1085 plugin_register_read("connectivity", connectivity_read);
1086 plugin_register_shutdown("connectivity", connectivity_shutdown);
1087 } /* void module_register */