From: Nick Hainke <vincent@systemli.org>
Date: Mon, 7 Dec 2020 19:29:54 +0100
Subject: [PATCH] snmp6: add ipv6 statistics
ChangeLog: snmp6 plugin: Add plugin for parsing IPv6 statistics
We would like to have pure ipv6 interface statistics. To get them,
we parse the snmp6 interface.
Signed-off-by: Nick Hainke <vincent@systemli.org>
---
Makefile.am | 8 +++
README | 4 ++
configure.ac | 2 +
src/collectd.conf.in | 6 ++
src/snmp6.c | 135 +++++++++++++++++++++++++++++++++++++++++++
src/types.db | 2 +
6 files changed, 157 insertions(+)
create mode 100644 src/snmp6.c
--- a/Makefile.am
+++ b/Makefile.am
@@ -1964,6 +1964,14 @@ TESTS += test_plugin_snmp_agent
endif
+if BUILD_PLUGIN_SNMP6
+pkglib_LTLIBRARIES += snmp6.la
+snmp6_la_SOURCES = src/snmp6.c
+snmp6_la_CFLAGS = $(AM_CFLAGS)
+snmp6_la_LDFLAGS = $(PLUGIN_LDFLAGS)
+snmp6_la_LIBADD = libignorelist.la
+endif # BUILD_PLUGIN_SNMP6
+
if BUILD_PLUGIN_STATSD
pkglib_LTLIBRARIES += statsd.la
statsd_la_SOURCES = src/statsd.c
--- a/README
+++ b/README
@@ -422,6 +422,10 @@ Features
network devices such as switches, routers, thermometers, rack monitoring
servers, etc. See collectd-snmp(5).
+ - snmp6
+ Read values from SNMP6 (Simple Network Management Protocol). Supports pure
+ IPv6 interface statistics.
+
- statsd
Acts as a StatsD server, reading values sent over the network from StatsD
clients and calculating rates and other aggregates out of these values.
--- a/configure.ac
+++ b/configure.ac
@@ -7162,6 +7162,7 @@ AC_PLUGIN([slurm], [$with_
AC_PLUGIN([smart], [$plugin_smart], [SMART statistics])
AC_PLUGIN([snmp], [$with_libnetsnmp], [SNMP querying plugin])
AC_PLUGIN([snmp_agent], [$with_libnetsnmpagent], [SNMP agent plugin])
+AC_PLUGIN([snmp6], [yes], [IPv6 Interface traffic statistics via snmp6])
AC_PLUGIN([statsd], [yes], [StatsD plugin])
AC_PLUGIN([swap], [$plugin_swap], [Swap usage statistics])
AC_PLUGIN([synproxy], [$plugin_synproxy], [Synproxy stats plugin])
@@ -7611,6 +7612,7 @@ AC_MSG_RESULT([ slurm . . . . . . . .
AC_MSG_RESULT([ smart . . . . . . . . $enable_smart])
AC_MSG_RESULT([ snmp . . . . . . . . $enable_snmp])
AC_MSG_RESULT([ snmp_agent . . . . . $enable_snmp_agent])
+AC_MSG_RESULT([ snmp6 . . . . . . . . $enable_snmp6])
AC_MSG_RESULT([ statsd . . . . . . . $enable_statsd])
AC_MSG_RESULT([ swap . . . . . . . . $enable_swap])
AC_MSG_RESULT([ synproxy . . . . . . $enable_synproxy])
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -207,6 +207,7 @@
#@BUILD_PLUGIN_SMART_TRUE@LoadPlugin smart
#@BUILD_PLUGIN_SNMP_TRUE@LoadPlugin snmp
#@BUILD_PLUGIN_SNMP_AGENT_TRUE@LoadPlugin snmp_agent
+#@BUILD_PLUGIN_SNMP6_TRUE@LoadPlugin snmp6
#@BUILD_PLUGIN_STATSD_TRUE@LoadPlugin statsd
#@BUILD_PLUGIN_SWAP_TRUE@LoadPlugin swap
#@BUILD_PLUGIN_SYSEVENT_TRUE@LoadPlugin sysevent
@@ -1718,6 +1719,11 @@
# </Table>
#</Plugin>
+#<Plugin snmp6>
+# Interface "eth0"
+# IgnoreSelected false
+#</Plugin>
+
#<Plugin statsd>
# Host "::"
# Port "8125"
--- /dev/null
+++ b/src/snmp6.c
@@ -0,0 +1,135 @@
+/*
+ This Plugin is based opn the interface.c Plugin.
+*/
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+#include <net/if.h>
+#include <sys/types.h>
+#include <ifaddrs.h>
+
+#include "plugin.h"
+#include "utils/cmds/putval.h"
+#include "utils/common/common.h"
+#include "utils/ignorelist/ignorelist.h"
+
+static const char *config_keys[] = {
+ "Interface",
+ "IgnoreSelected",
+};
+static int config_keys_num = STATIC_ARRAY_SIZE(config_keys);
+
+static ignorelist_t *ignorelist;
+
+static int snmp6_config(const char *key, const char *value) {
+ if (ignorelist == NULL)
+ ignorelist = ignorelist_create(/* invert = */ 1);
+
+ if (strcasecmp(key, "Interface") == 0) {
+ ignorelist_add(ignorelist, value);
+ } else if (strcasecmp(key, "IgnoreSelected") == 0) {
+ int invert = 1;
+ if (IS_TRUE(value))
+ invert = 0;
+ ignorelist_set_invert(ignorelist, invert);
+ }
+
+ return 0;
+}
+
+/* Copied from interface.c */
+static void snmp6_submit(const char *dev, const char *type, derive_t rx,
+ derive_t tx) {
+ value_list_t vl = VALUE_LIST_INIT;
+ value_t values[] = {
+ {.derive = rx},
+ {.derive = tx},
+ };
+
+ vl.values = values;
+ vl.values_len = STATIC_ARRAY_SIZE(values);
+ sstrncpy(vl.plugin, "snmp6", sizeof(vl.plugin));
+ sstrncpy(vl.plugin_instance, dev, sizeof(vl.plugin_instance));
+ sstrncpy(vl.type, type, sizeof(vl.type));
+
+ plugin_dispatch_values(&vl);
+} /* void if_submit */
+
+int snmp_read(char *ifname) {
+ FILE *fh;
+ char buffer[1024];
+ char *fields[2];
+ int numfields;
+ int currline = 0;
+ derive_t data[76];
+ char procpath[1024];
+ int offset = 0;
+
+ if (ignorelist_match(ignorelist, ifname) != 0)
+ return 0;
+
+ if (strncmp("all", ifname, strlen("all")) == 0) {
+ snprintf(procpath, 1024, "/proc/net/snmp6");
+ offset = 1;
+ } else {
+ snprintf(procpath, 1024, "/proc/net/dev_snmp6/%s", ifname);
+ }
+
+ if ((fh = fopen(procpath, "r")) == NULL) {
+ WARNING("snmp6 plugin: try opening %s : fopen: %s", procpath, STRERRNO);
+ return -1;
+ }
+
+ while (fgets(buffer, 1024, fh) != NULL) {
+ numfields = strsplit(buffer, fields, 2);
+
+ if (numfields < 2)
+ return -1;
+
+ data[currline++] = atoll(fields[1]);
+ }
+
+ fclose(fh);
+
+ if (currline < 28) {
+ return -1;
+ }
+
+ snmp6_submit(ifname, "if_octets", data[23 - offset], data[24 - offset]);
+ snmp6_submit(ifname, "if_octets_mcast", data[25 - offset], data[26 - offset]);
+ snmp6_submit(ifname, "if_octets_bcast", data[27 - offset], data[28 - offset]);
+ return 0;
+}
+
+int read_all_interfaces(void) {
+#ifndef HAVE_IFADDRS_H
+ return -1;
+#else
+
+ // getifaddrs is not working all the time (e.g. wireguard interfaces)
+ // instead we use if_nameindex() syscall as suggested in:
+ // https://stackoverflow.com/a/45796495/8474618
+ struct if_nameindex *if_nidxs, *intf;
+
+ if_nidxs = if_nameindex();
+
+ if (if_nidxs != NULL) {
+ for (intf = if_nidxs; intf->if_index != 0 || intf->if_name != NULL; intf++) {
+ snmp_read(intf->if_name);
+ }
+ if_freenameindex(if_nidxs);
+ }
+
+ snmp_read("all");
+ return 0;
+#endif
+}
+
+void module_register(void) {
+ plugin_register_config("snmp6", snmp6_config, config_keys, config_keys_num);
+ plugin_register_read("snmp6", read_all_interfaces);
+} /* void module_register */
--- a/src/types.db
+++ b/src/types.db
@@ -132,6 +132,8 @@ if_dropped rx:DERIVE:0:U, t
if_errors rx:DERIVE:0:U, tx:DERIVE:0:U
if_multicast value:DERIVE:0:U
if_octets rx:DERIVE:0:U, tx:DERIVE:0:U
+if_octets_mcast rx:DERIVE:0:U, tx:DERIVE:0:U
+if_octets_bcast rx:DERIVE:0:U, tx:DERIVE:0:U
if_packets rx:DERIVE:0:U, tx:DERIVE:0:U
if_rx_dropped value:DERIVE:0:U
if_rx_errors value:DERIVE:0:U