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186 lines
5.5 KiB
186 lines
5.5 KiB
From: Nick Hainke <vincent@systemli.org>
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Date: Mon, 7 Dec 2020 23:07:30 +0100
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Subject: [PATCH] dhcpleases: add dhcpleases plugin
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Changelog: dhcpleases: add plugin for counting current dhcp leases
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The plugin is useful for the Freifunk Community. Currently, we use
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the exec-plugin. With that dhcpleases plugin we have native collectd
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support to measure this important statistic.
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Signed-off-by: Nick Hainke <vincent@systemli.org>
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---
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Makefile.am | 6 ++++
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README | 3 ++
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configure.ac | 2 ++
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src/collectd.conf.in | 5 +++
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src/dhcpleases.c | 83 ++++++++++++++++++++++++++++++++++++++++++++
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5 files changed, 99 insertions(+)
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create mode 100644 src/dhcpleases.c
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diff --git a/Makefile.am b/Makefile.am
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index 00947da0..5ee76a00 100644
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--- a/Makefile.am
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+++ b/Makefile.am
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@@ -963,6 +963,12 @@ df_la_LDFLAGS = $(PLUGIN_LDFLAGS)
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df_la_LIBADD = libignorelist.la libmount.la
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endif
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+if BUILD_PLUGIN_DHCPLEASES
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+pkglib_LTLIBRARIES += dhcpleases.la
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+dhcpleases_la_SOURCES = src/dhcpleases.c
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+dhcpleases_la_LDFLAGS = $(PLUGIN_LDFLAGS)
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+endif
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+
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if BUILD_PLUGIN_DISK
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pkglib_LTLIBRARIES += disk.la
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disk_la_SOURCES = src/disk.c
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diff --git a/README b/README
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index e42e9c24..dd104408 100644
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--- a/README
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+++ b/README
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@@ -106,6 +106,9 @@ Features
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Disk utilization: Sectors read/written, number of read/write actions,
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average time an IO-operation took to complete.
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+ - dhcpleases
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+ Collect number of current dhcp leases.
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+
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- dns
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DNS traffic: Query types, response codes, opcodes and traffic/octets
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transferred.
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diff --git a/configure.ac b/configure.ac
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index bcfb8cf5..6c2b6574 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -7061,6 +7061,7 @@ AC_PLUGIN([curl_xml], [$plugin_curl_xml], [CURL generic xml
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AC_PLUGIN([dbi], [$with_libdbi], [General database statistics])
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AC_PLUGIN([dcpmm], [$with_libpmwapi], [Intel(R) Optane(TM) DC Persistent Memory performance and health statistics])
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AC_PLUGIN([df], [$plugin_df], [Filesystem usage statistics])
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+AC_PLUGIN([dhcpleases], [yes], [DHCP Leases])
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AC_PLUGIN([disk], [$plugin_disk], [Disk usage statistics])
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AC_PLUGIN([dns], [$with_libpcap], [DNS traffic analysis])
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AC_PLUGIN([dpdkevents], [$plugin_dpdkevents], [Events from DPDK])
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@@ -7508,6 +7509,7 @@ AC_MSG_RESULT([ curl_xml . . . . . . $enable_curl_xml])
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AC_MSG_RESULT([ dbi . . . . . . . . . $enable_dbi])
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AC_MSG_RESULT([ dcpmm . . . . . . . $enable_dcpmm])
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AC_MSG_RESULT([ df . . . . . . . . . $enable_df])
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+AC_MSG_RESULT([ dhcpleases. . . . . . $enable_dhcpleases])
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AC_MSG_RESULT([ disk . . . . . . . . $enable_disk])
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AC_MSG_RESULT([ dns . . . . . . . . . $enable_dns])
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AC_MSG_RESULT([ dpdkevents. . . . . . $enable_dpdkevents])
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diff --git a/src/collectd.conf.in b/src/collectd.conf.in
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index 562a55d9..94659e81 100644
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--- a/src/collectd.conf.in
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+++ b/src/collectd.conf.in
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@@ -119,6 +119,7 @@
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#@BUILD_PLUGIN_DBI_TRUE@LoadPlugin dbi
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#@BUILD_PLUGIN_DCPMM_TRUE@LoadPlugin dcpmm
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#@BUILD_PLUGIN_DF_TRUE@LoadPlugin df
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+#@BUILD_PLUGIN_DHCPLEASES_TRUE@LoadPlugin dhcpleases
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#@BUILD_PLUGIN_DISK_TRUE@LoadPlugin disk
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#@BUILD_PLUGIN_DNS_TRUE@LoadPlugin dns
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#@BUILD_PLUGIN_DPDKEVENTS_TRUE@LoadPlugin dpdkevents
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@@ -689,6 +690,10 @@
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# SelectNumericQueryTypes true
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#</Plugin>
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+#<Plugin dhcpleases>
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+# Path "/tmp/dhcp.leases"
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+#</Plugin>
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+
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#<Plugin "dpdkevents">
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# <EAL>
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# Coremask "0x1"
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diff --git a/src/dhcpleases.c b/src/dhcpleases.c
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new file mode 100644
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index 00000000..f43d62bf
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--- /dev/null
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+++ b/src/dhcpleases.c
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@@ -0,0 +1,83 @@
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+#include <errno.h>
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+#include <stdio.h>
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+
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+#include "utils/common/common.h"
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+
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+#include "configfile.h"
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+#include "plugin.h"
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+
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+static char *dhcp_lease_file;
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+
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+static const char *config_keys[] = {
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+ "Path",
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+};
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+static int config_keys_num = STATIC_ARRAY_SIZE(config_keys);
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+
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+/* copied from ping.c plugin */
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+static int config_set_string(const char *name, /* {{{ */
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+ char **var, const char *value) {
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+ char *tmp;
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+
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+ tmp = strdup(value);
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+ if (tmp == NULL) {
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+ ERROR("dhcpleases plugin: Setting `%s' to `%s' failed: strdup failed: %s", name,
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+ value, STRERRNO);
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+ return 1;
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+ }
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+
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+ if (*var != NULL)
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+ free(*var);
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+ *var = tmp;
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+ return 0;
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+} /* }}} int config_set_string */
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+
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+static int dhcpleases_config(const char *key, const char *value) {
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+ if (strcasecmp(key, "Path") == 0) {
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+ int status = config_set_string(key, &dhcp_lease_file, value);
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+ if (status != 0)
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+ return status;
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+ }
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+ return 0;
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+}
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+
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+static void dhcpleases_submit(gauge_t counter) {
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+ value_list_t vl = VALUE_LIST_INIT;
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+ value_t values[] = {
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+ {.gauge = counter},
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+ };
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+
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+ vl.values = values;
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+ vl.values_len = STATIC_ARRAY_SIZE(values);
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+
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+ sstrncpy(vl.plugin, "dhcpleases", sizeof(vl.plugin));
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+ sstrncpy(vl.type, "count", sizeof(vl.type));
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+
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+ plugin_dispatch_values(&vl);
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+}
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+
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+static int dhcp_leases_read(void) {
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+
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+ FILE *fh;
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+ char buffer[1024];
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+ gauge_t count = 0;
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+
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+ if ((fh = fopen(dhcp_lease_file, "r")) == NULL) {
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+ WARNING("interface plugin: fopen: %s", STRERRNO);
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+ return -1;
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+ }
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+
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+ while (fgets(buffer, 1024, fh) != NULL) {
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+ count++;
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+ }
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+ fclose(fh);
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+
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+ dhcpleases_submit(count);
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+
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+ return 0;
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+}
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+
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+void module_register(void) {
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+ plugin_register_config("dhcpleases", dhcpleases_config, config_keys,
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+ config_keys_num);
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+ plugin_register_read("dhcpleases", dhcp_leases_read);
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+}
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--
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2.29.2
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