From ae5aea0191d46cf8bc1bae772f31d93e221c76d9 Mon Sep 17 00:00:00 2001
From: Siavash Safi <siavash.safi@gmail.com>
Date: Tue, 12 May 2015 17:48:05 +0430
Subject: [PATCH] Add netdev collector for FreeBSD.

---
 collector/netdev_freebsd.go | 111 ++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 collector/netdev_freebsd.go

diff --git a/collector/netdev_freebsd.go b/collector/netdev_freebsd.go
new file mode 100644
index 00000000..5705108f
--- /dev/null
+++ b/collector/netdev_freebsd.go
@@ -0,0 +1,111 @@
+// +build !nonetdev
+
+package collector
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+/*
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <ifaddrs.h>
+#include <net/if.h>
+*/
+import "C"
+
+const (
+	netDevSubsystem = "network"
+)
+
+type netDevCollector struct {
+	config  Config
+	metrics map[string]*prometheus.GaugeVec
+}
+
+func init() {
+	Factories["netdev"] = NewNetDevCollector
+}
+
+// Takes a config struct and prometheus registry and returns a new Collector exposing
+// network device stats.
+func NewNetDevCollector(config Config) (Collector, error) {
+	return &netDevCollector{
+		config:  config,
+		metrics: map[string]*prometheus.GaugeVec{},
+	}, nil
+}
+
+func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
+	netDev, err := getNetDevStats()
+	if err != nil {
+		return fmt.Errorf("Couldn't get netstats: %s", err)
+	}
+	for direction, devStats := range netDev {
+		for dev, stats := range devStats {
+			for t, value := range stats {
+				key := direction + "_" + t
+				if _, ok := c.metrics[key]; !ok {
+					c.metrics[key] = prometheus.NewGaugeVec(
+						prometheus.GaugeOpts{
+							Namespace: Namespace,
+							Subsystem: netDevSubsystem,
+							Name:      key,
+							Help:      fmt.Sprintf("%s %s from getifaddrs().", t, direction),
+						},
+						[]string{"device"},
+					)
+				}
+				v, err := strconv.ParseFloat(value, 64)
+				if err != nil {
+					return fmt.Errorf("Invalid value %s in netstats: %s", value, err)
+				}
+				c.metrics[key].WithLabelValues(dev).Set(v)
+			}
+		}
+	}
+	for _, m := range c.metrics {
+		m.Collect(ch)
+	}
+	return err
+}
+
+func getNetDevStats() (map[string]map[string]map[string]string, error) {
+	netDev := map[string]map[string]map[string]string{}
+	netDev["transmit"] = map[string]map[string]string{}
+	netDev["receive"] = map[string]map[string]string{}
+
+	var ifap, ifa *C.struct_ifaddrs
+	if C.getifaddrs(&ifap) == -1 {
+		return nil, errors.New("getifaddrs() failed!")
+	}
+	for ifa = ifap; ifa != nil; ifa = ifa.ifa_next {
+		if ifa.ifa_addr.sa_family == C.AF_LINK {
+			receive := map[string]string{}
+			transmit := map[string]string{}
+			//var data *C.struct_if_data
+			data := (*C.struct_if_data)(ifa.ifa_data)
+			receive["packets"] = strconv.Itoa(int(data.ifi_ipackets))
+			transmit["packets"] = strconv.Itoa(int(data.ifi_opackets))
+			receive["errs"] = strconv.Itoa(int(data.ifi_ierrors))
+			transmit["errs"] = strconv.Itoa(int(data.ifi_oerrors))
+			receive["bytes"] = strconv.Itoa(int(data.ifi_ibytes))
+			transmit["bytes"] = strconv.Itoa(int(data.ifi_obytes))
+			receive["multicast"] = strconv.Itoa(int(data.ifi_imcasts))
+			transmit["multicast"] = strconv.Itoa(int(data.ifi_omcasts))
+			receive["drop"] = strconv.Itoa(int(data.ifi_iqdrops))
+			//transmit["drops"] = strconv.Itoa(int(data.ifi_oqdrops))
+
+			netDev["receive"][C.GoString(ifa.ifa_name)] = receive
+			netDev["transmit"][C.GoString(ifa.ifa_name)] = transmit
+		}
+	}
+	defer C.freeifaddrs(ifap)
+
+	return netDev, nil
+}