143 lines
3.4 KiB
Go
143 lines
3.4 KiB
Go
// Copyright 2023 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package procfs
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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const (
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blackholeRepresentation string = "*"
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blackholeIfaceName string = "blackhole"
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routeLineColumns int = 11
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)
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// A NetRouteLine represents one line from net/route.
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type NetRouteLine struct {
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Iface string
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Destination uint32
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Gateway uint32
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Flags uint32
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RefCnt uint32
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Use uint32
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Metric uint32
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Mask uint32
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MTU uint32
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Window uint32
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IRTT uint32
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}
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func (fs FS) NetRoute() ([]NetRouteLine, error) {
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return readNetRoute(fs.proc.Path("net", "route"))
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}
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func readNetRoute(path string) ([]NetRouteLine, error) {
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b, err := util.ReadFileNoStat(path)
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if err != nil {
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return nil, err
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}
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routelines, err := parseNetRoute(bytes.NewReader(b))
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if err != nil {
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return nil, fmt.Errorf("failed to read net route from %s: %w", path, err)
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}
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return routelines, nil
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}
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func parseNetRoute(r io.Reader) ([]NetRouteLine, error) {
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var routelines []NetRouteLine
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scanner := bufio.NewScanner(r)
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scanner.Scan()
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for scanner.Scan() {
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fields := strings.Fields(scanner.Text())
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routeline, err := parseNetRouteLine(fields)
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if err != nil {
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return nil, err
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}
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routelines = append(routelines, *routeline)
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}
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return routelines, nil
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}
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func parseNetRouteLine(fields []string) (*NetRouteLine, error) {
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if len(fields) != routeLineColumns {
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return nil, fmt.Errorf("invalid routeline, num of digits: %d", len(fields))
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}
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iface := fields[0]
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if iface == blackholeRepresentation {
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iface = blackholeIfaceName
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}
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destination, err := strconv.ParseUint(fields[1], 16, 32)
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if err != nil {
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return nil, err
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}
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gateway, err := strconv.ParseUint(fields[2], 16, 32)
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if err != nil {
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return nil, err
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}
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flags, err := strconv.ParseUint(fields[3], 10, 32)
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if err != nil {
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return nil, err
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}
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refcnt, err := strconv.ParseUint(fields[4], 10, 32)
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if err != nil {
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return nil, err
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}
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use, err := strconv.ParseUint(fields[5], 10, 32)
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if err != nil {
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return nil, err
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}
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metric, err := strconv.ParseUint(fields[6], 10, 32)
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if err != nil {
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return nil, err
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}
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mask, err := strconv.ParseUint(fields[7], 16, 32)
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if err != nil {
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return nil, err
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}
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mtu, err := strconv.ParseUint(fields[8], 10, 32)
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if err != nil {
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return nil, err
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}
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window, err := strconv.ParseUint(fields[9], 10, 32)
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if err != nil {
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return nil, err
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}
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irtt, err := strconv.ParseUint(fields[10], 10, 32)
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if err != nil {
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return nil, err
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}
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routeline := &NetRouteLine{
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Iface: iface,
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Destination: uint32(destination),
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Gateway: uint32(gateway),
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Flags: uint32(flags),
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RefCnt: uint32(refcnt),
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Use: uint32(use),
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Metric: uint32(metric),
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Mask: uint32(mask),
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MTU: uint32(mtu),
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Window: uint32(window),
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IRTT: uint32(irtt),
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}
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return routeline, nil
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}
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