229 lines
6.7 KiB
Go
229 lines
6.7 KiB
Go
// Copyright 2020 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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"encoding/hex"
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"fmt"
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"io"
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"net"
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"os"
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"strconv"
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"strings"
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)
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const (
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// readLimit is used by io.LimitReader while reading the content of the
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// /proc/net/udp{,6} files. The number of lines inside such a file is dynamic
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// as each line represents a single used socket.
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// In theory, the number of available sockets is 65535 (2^16 - 1) per IP.
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// With e.g. 150 Byte per line and the maximum number of 65535,
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// the reader needs to handle 150 Byte * 65535 =~ 10 MB for a single IP.
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readLimit = 4294967296 // Byte -> 4 GiB
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)
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type (
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// NetUDP represents the contents of /proc/net/udp{,6} file without the header.
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NetUDP []*netUDPLine
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// NetUDPSummary provides already computed values like the total queue lengths or
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// the total number of used sockets. In contrast to NetUDP it does not collect
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// the parsed lines into a slice.
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NetUDPSummary struct {
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// TxQueueLength shows the total queue length of all parsed tx_queue lengths.
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TxQueueLength uint64
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// RxQueueLength shows the total queue length of all parsed rx_queue lengths.
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RxQueueLength uint64
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// UsedSockets shows the total number of parsed lines representing the
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// number of used sockets.
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UsedSockets uint64
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}
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// netUDPLine represents the fields parsed from a single line
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// in /proc/net/udp{,6}. Fields which are not used by UDP are skipped.
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// For the proc file format details, see https://linux.die.net/man/5/proc.
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netUDPLine struct {
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Sl uint64
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LocalAddr net.IP
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LocalPort uint64
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RemAddr net.IP
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RemPort uint64
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St uint64
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TxQueue uint64
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RxQueue uint64
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UID uint64
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}
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)
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// NetUDP returns the IPv4 kernel/networking statistics for UDP datagrams
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// read from /proc/net/udp.
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func (fs FS) NetUDP() (NetUDP, error) {
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return newNetUDP(fs.proc.Path("net/udp"))
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}
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// NetUDP6 returns the IPv6 kernel/networking statistics for UDP datagrams
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// read from /proc/net/udp6.
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func (fs FS) NetUDP6() (NetUDP, error) {
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return newNetUDP(fs.proc.Path("net/udp6"))
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}
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// NetUDPSummary returns already computed statistics like the total queue lengths
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// for UDP datagrams read from /proc/net/udp.
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func (fs FS) NetUDPSummary() (*NetUDPSummary, error) {
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return newNetUDPSummary(fs.proc.Path("net/udp"))
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}
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// NetUDP6Summary returns already computed statistics like the total queue lengths
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// for UDP datagrams read from /proc/net/udp6.
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func (fs FS) NetUDP6Summary() (*NetUDPSummary, error) {
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return newNetUDPSummary(fs.proc.Path("net/udp6"))
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}
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// newNetUDP creates a new NetUDP{,6} from the contents of the given file.
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func newNetUDP(file string) (NetUDP, error) {
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f, err := os.Open(file)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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netUDP := NetUDP{}
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lr := io.LimitReader(f, readLimit)
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s := bufio.NewScanner(lr)
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s.Scan() // skip first line with headers
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for s.Scan() {
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fields := strings.Fields(s.Text())
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line, err := parseNetUDPLine(fields)
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if err != nil {
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return nil, err
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}
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netUDP = append(netUDP, line)
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}
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if err := s.Err(); err != nil {
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return nil, err
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}
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return netUDP, nil
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}
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// newNetUDPSummary creates a new NetUDP{,6} from the contents of the given file.
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func newNetUDPSummary(file string) (*NetUDPSummary, error) {
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f, err := os.Open(file)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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netUDPSummary := &NetUDPSummary{}
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lr := io.LimitReader(f, readLimit)
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s := bufio.NewScanner(lr)
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s.Scan() // skip first line with headers
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for s.Scan() {
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fields := strings.Fields(s.Text())
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line, err := parseNetUDPLine(fields)
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if err != nil {
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return nil, err
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}
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netUDPSummary.TxQueueLength += line.TxQueue
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netUDPSummary.RxQueueLength += line.RxQueue
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netUDPSummary.UsedSockets++
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}
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if err := s.Err(); err != nil {
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return nil, err
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}
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return netUDPSummary, nil
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}
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// parseNetUDPLine parses a single line, represented by a list of fields.
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func parseNetUDPLine(fields []string) (*netUDPLine, error) {
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line := &netUDPLine{}
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if len(fields) < 8 {
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return nil, fmt.Errorf(
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"cannot parse net udp socket line as it has less then 8 columns: %s",
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strings.Join(fields, " "),
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)
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}
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var err error // parse error
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// sl
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s := strings.Split(fields[0], ":")
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if len(s) != 2 {
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return nil, fmt.Errorf(
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"cannot parse sl field in udp socket line: %s", fields[0])
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}
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if line.Sl, err = strconv.ParseUint(s[0], 0, 64); err != nil {
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return nil, fmt.Errorf("cannot parse sl value in udp socket line: %s", err)
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}
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// local_address
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l := strings.Split(fields[1], ":")
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if len(l) != 2 {
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return nil, fmt.Errorf(
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"cannot parse local_address field in udp socket line: %s", fields[1])
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}
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if line.LocalAddr, err = hex.DecodeString(l[0]); err != nil {
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return nil, fmt.Errorf(
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"cannot parse local_address value in udp socket line: %s", err)
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}
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if line.LocalPort, err = strconv.ParseUint(l[1], 16, 64); err != nil {
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return nil, fmt.Errorf(
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"cannot parse local_address port value in udp socket line: %s", err)
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}
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// remote_address
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r := strings.Split(fields[2], ":")
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if len(r) != 2 {
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return nil, fmt.Errorf(
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"cannot parse rem_address field in udp socket line: %s", fields[1])
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}
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if line.RemAddr, err = hex.DecodeString(r[0]); err != nil {
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return nil, fmt.Errorf(
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"cannot parse rem_address value in udp socket line: %s", err)
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}
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if line.RemPort, err = strconv.ParseUint(r[1], 16, 64); err != nil {
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return nil, fmt.Errorf(
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"cannot parse rem_address port value in udp socket line: %s", err)
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}
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// st
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if line.St, err = strconv.ParseUint(fields[3], 16, 64); err != nil {
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return nil, fmt.Errorf(
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"cannot parse st value in udp socket line: %s", err)
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}
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// tx_queue and rx_queue
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q := strings.Split(fields[4], ":")
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if len(q) != 2 {
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return nil, fmt.Errorf(
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"cannot parse tx/rx queues in udp socket line as it has a missing colon: %s",
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fields[4],
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)
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}
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if line.TxQueue, err = strconv.ParseUint(q[0], 16, 64); err != nil {
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return nil, fmt.Errorf("cannot parse tx_queue value in udp socket line: %s", err)
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}
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if line.RxQueue, err = strconv.ParseUint(q[1], 16, 64); err != nil {
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return nil, fmt.Errorf("cannot parse rx_queue value in udp socket line: %s", err)
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}
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// uid
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if line.UID, err = strconv.ParseUint(fields[7], 0, 64); err != nil {
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return nil, fmt.Errorf(
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"cannot parse uid value in udp socket line: %s", err)
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}
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return line, nil
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}
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