Add netdev collector for darwin

Same as for openbsd, this is just slightly adjusted from freebsd
variant.

collector/netdev_common.go

@@ -12,7 +12,7 @@
 // limitations under the License.
 
 // +build !nonetdev
-// +build linux freebsd openbsd dragonfly
+// +build linux freebsd openbsd dragonfly darwin
 
 package collector
 

collector/netdev_darwin.go

@@ -0,0 +1,67 @@
+// Copyright 2015 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !nonetdev
+
+package collector
+
+import (
+	"errors"
+	"regexp"
+	"strconv"
+
+	"github.com/prometheus/common/log"
+)
+
+/*
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <ifaddrs.h>
+#include <net/if.h>
+*/
+import "C"
+
+func getNetDevStats(ignore *regexp.Regexp) (map[string]map[string]string, error) {
+	netDev := map[string]map[string]string{}
+
+	var ifap, ifa *C.struct_ifaddrs
+	if C.getifaddrs(&ifap) == -1 {
+		return nil, errors.New("getifaddrs() failed")
+	}
+	defer C.freeifaddrs(ifap)
+
+	for ifa = ifap; ifa != nil; ifa = ifa.ifa_next {
+		if ifa.ifa_addr.sa_family == C.AF_LINK {
+			dev := C.GoString(ifa.ifa_name)
+			if ignore.MatchString(dev) {
+				log.Debugf("Ignoring device: %s", dev)
+				continue
+			}
+
+			devStats := map[string]string{}
+			data := (*C.struct_if_data)(ifa.ifa_data)
+			devStats["receive_packets"] = strconv.FormatUint(uint64(data.ifi_ipackets), 10)
+			devStats["transmit_packets"] = strconv.FormatUint(uint64(data.ifi_opackets), 10)
+			devStats["receive_errs"] = strconv.FormatUint(uint64(data.ifi_ierrors), 10)
+			devStats["transmit_errs"] = strconv.FormatUint(uint64(data.ifi_oerrors), 10)
+			devStats["receive_bytes"] = strconv.FormatUint(uint64(data.ifi_ibytes), 10)
+			devStats["transmit_bytes"] = strconv.FormatUint(uint64(data.ifi_obytes), 10)
+			devStats["receive_multicast"] = strconv.FormatUint(uint64(data.ifi_imcasts), 10)
+			devStats["transmit_multicast"] = strconv.FormatUint(uint64(data.ifi_omcasts), 10)
+			netDev[dev] = devStats
+		}
+	}
+
+	return netDev, nil
+}