[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/prometheus/procfs/arp.go b/vendor/github.com/prometheus/procfs/arp.go
new file mode 100644
index 0000000..4e47e61
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/arp.go
@@ -0,0 +1,85 @@
+// Copyright 2019 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.
+
+package procfs
+
+import (
+ "fmt"
+ "io/ioutil"
+ "net"
+ "strings"
+)
+
+// ARPEntry contains a single row of the columnar data represented in
+// /proc/net/arp.
+type ARPEntry struct {
+ // IP address
+ IPAddr net.IP
+ // MAC address
+ HWAddr net.HardwareAddr
+ // Name of the device
+ Device string
+}
+
+// GatherARPEntries retrieves all the ARP entries, parse the relevant columns,
+// and then return a slice of ARPEntry's.
+func (fs FS) GatherARPEntries() ([]ARPEntry, error) {
+ data, err := ioutil.ReadFile(fs.proc.Path("net/arp"))
+ if err != nil {
+ return nil, fmt.Errorf("error reading arp %q: %w", fs.proc.Path("net/arp"), err)
+ }
+
+ return parseARPEntries(data)
+}
+
+func parseARPEntries(data []byte) ([]ARPEntry, error) {
+ lines := strings.Split(string(data), "\n")
+ entries := make([]ARPEntry, 0)
+ var err error
+ const (
+ expectedDataWidth = 6
+ expectedHeaderWidth = 9
+ )
+ for _, line := range lines {
+ columns := strings.Fields(line)
+ width := len(columns)
+
+ if width == expectedHeaderWidth || width == 0 {
+ continue
+ } else if width == expectedDataWidth {
+ entry, err := parseARPEntry(columns)
+ if err != nil {
+ return []ARPEntry{}, fmt.Errorf("failed to parse ARP entry: %w", err)
+ }
+ entries = append(entries, entry)
+ } else {
+ return []ARPEntry{}, fmt.Errorf("%d columns were detected, but %d were expected", width, expectedDataWidth)
+ }
+
+ }
+
+ return entries, err
+}
+
+func parseARPEntry(columns []string) (ARPEntry, error) {
+ ip := net.ParseIP(columns[0])
+ mac := net.HardwareAddr(columns[3])
+
+ entry := ARPEntry{
+ IPAddr: ip,
+ HWAddr: mac,
+ Device: columns[5],
+ }
+
+ return entry, nil
+}