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- From: Nick Hainke <vincent@systemli.org>
- Date: Mon, 7 Dec 2020 23:07:30 +0100
- Subject: [PATCH] dhcpleases: add dhcpleases plugin
-
- Changelog: dhcpleases: add plugin for counting current dhcp leases
-
- The plugin is useful for the Freifunk Community. Currently, we use
- the exec-plugin. With that dhcpleases plugin we have native collectd
- support to measure this important statistic.
-
- Signed-off-by: Nick Hainke <vincent@systemli.org>
- ---
- Makefile.am | 6 ++++
- README | 3 ++
- configure.ac | 2 ++
- src/collectd.conf.in | 5 +++
- src/dhcpleases.c | 83 ++++++++++++++++++++++++++++++++++++++++++++
- 5 files changed, 99 insertions(+)
- create mode 100644 src/dhcpleases.c
-
- --- a/Makefile.am
- +++ b/Makefile.am
- @@ -963,6 +963,12 @@ df_la_LDFLAGS = $(PLUGIN_LDFLAGS)
- df_la_LIBADD = libignorelist.la libmount.la
- endif
-
- +if BUILD_PLUGIN_DHCPLEASES
- +pkglib_LTLIBRARIES += dhcpleases.la
- +dhcpleases_la_SOURCES = src/dhcpleases.c
- +dhcpleases_la_LDFLAGS = $(PLUGIN_LDFLAGS)
- +endif
- +
- if BUILD_PLUGIN_DISK
- pkglib_LTLIBRARIES += disk.la
- disk_la_SOURCES = src/disk.c
- --- a/README
- +++ b/README
- @@ -106,6 +106,9 @@ Features
- Disk utilization: Sectors read/written, number of read/write actions,
- average time an IO-operation took to complete.
-
- + - dhcpleases
- + Collect number of current dhcp leases.
- +
- - dns
- DNS traffic: Query types, response codes, opcodes and traffic/octets
- transferred.
- --- a/configure.ac
- +++ b/configure.ac
- @@ -7063,6 +7063,7 @@ AC_PLUGIN([curl_xml], [$plugi
- AC_PLUGIN([dbi], [$with_libdbi], [General database statistics])
- AC_PLUGIN([dcpmm], [$with_libpmwapi], [Intel(R) Optane(TM) DC Persistent Memory performance and health statistics])
- AC_PLUGIN([df], [$plugin_df], [Filesystem usage statistics])
- +AC_PLUGIN([dhcpleases], [yes], [DHCP Leases])
- AC_PLUGIN([disk], [$plugin_disk], [Disk usage statistics])
- AC_PLUGIN([dns], [$with_libpcap], [DNS traffic analysis])
- AC_PLUGIN([dpdkevents], [$plugin_dpdkevents], [Events from DPDK])
- @@ -7512,6 +7513,7 @@ AC_MSG_RESULT([ curl_xml . . . . . .
- AC_MSG_RESULT([ dbi . . . . . . . . . $enable_dbi])
- AC_MSG_RESULT([ dcpmm . . . . . . . $enable_dcpmm])
- AC_MSG_RESULT([ df . . . . . . . . . $enable_df])
- +AC_MSG_RESULT([ dhcpleases. . . . . . $enable_dhcpleases])
- AC_MSG_RESULT([ disk . . . . . . . . $enable_disk])
- AC_MSG_RESULT([ dns . . . . . . . . . $enable_dns])
- AC_MSG_RESULT([ dpdkevents. . . . . . $enable_dpdkevents])
- --- a/src/collectd.conf.in
- +++ b/src/collectd.conf.in
- @@ -119,6 +119,7 @@
- #@BUILD_PLUGIN_DBI_TRUE@LoadPlugin dbi
- #@BUILD_PLUGIN_DCPMM_TRUE@LoadPlugin dcpmm
- #@BUILD_PLUGIN_DF_TRUE@LoadPlugin df
- +#@BUILD_PLUGIN_DHCPLEASES_TRUE@LoadPlugin dhcpleases
- #@BUILD_PLUGIN_DISK_TRUE@LoadPlugin disk
- #@BUILD_PLUGIN_DNS_TRUE@LoadPlugin dns
- #@BUILD_PLUGIN_DPDKEVENTS_TRUE@LoadPlugin dpdkevents
- @@ -690,6 +691,10 @@
- # SelectNumericQueryTypes true
- #</Plugin>
-
- +#<Plugin dhcpleases>
- +# Path "/tmp/dhcp.leases"
- +#</Plugin>
- +
- #<Plugin "dpdkevents">
- # <EAL>
- # Coremask "0x1"
- --- /dev/null
- +++ b/src/dhcpleases.c
- @@ -0,0 +1,83 @@
- +#include <errno.h>
- +#include <stdio.h>
- +
- +#include "utils/common/common.h"
- +
- +#include "configfile.h"
- +#include "plugin.h"
- +
- +static char *dhcp_lease_file;
- +
- +static const char *config_keys[] = {
- + "Path",
- +};
- +static int config_keys_num = STATIC_ARRAY_SIZE(config_keys);
- +
- +/* copied from ping.c plugin */
- +static int config_set_string(const char *name, /* {{{ */
- + char **var, const char *value) {
- + char *tmp;
- +
- + tmp = strdup(value);
- + if (tmp == NULL) {
- + ERROR("dhcpleases plugin: Setting `%s' to `%s' failed: strdup failed: %s", name,
- + value, STRERRNO);
- + return 1;
- + }
- +
- + if (*var != NULL)
- + free(*var);
- + *var = tmp;
- + return 0;
- +} /* }}} int config_set_string */
- +
- +static int dhcpleases_config(const char *key, const char *value) {
- + if (strcasecmp(key, "Path") == 0) {
- + int status = config_set_string(key, &dhcp_lease_file, value);
- + if (status != 0)
- + return status;
- + }
- + return 0;
- +}
- +
- +static void dhcpleases_submit(gauge_t counter) {
- + value_list_t vl = VALUE_LIST_INIT;
- + value_t values[] = {
- + {.gauge = counter},
- + };
- +
- + vl.values = values;
- + vl.values_len = STATIC_ARRAY_SIZE(values);
- +
- + sstrncpy(vl.plugin, "dhcpleases", sizeof(vl.plugin));
- + sstrncpy(vl.type, "count", sizeof(vl.type));
- +
- + plugin_dispatch_values(&vl);
- +}
- +
- +static int dhcp_leases_read(void) {
- +
- + FILE *fh;
- + char buffer[1024];
- + gauge_t count = 0;
- +
- + if ((fh = fopen(dhcp_lease_file, "r")) == NULL) {
- + WARNING("interface plugin: fopen: %s", STRERRNO);
- + return -1;
- + }
- +
- + while (fgets(buffer, 1024, fh) != NULL) {
- + count++;
- + }
- + fclose(fh);
- +
- + dhcpleases_submit(count);
- +
- + return 0;
- +}
- +
- +void module_register(void) {
- + plugin_register_config("dhcpleases", dhcpleases_config, config_keys,
- + config_keys_num);
- + plugin_register_read("dhcpleases", dhcp_leases_read);
- +}
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