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// Copyright 2018 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 !windows
package sysfs
import (
"fmt"
"io/ioutil"
"os"
"reflect"
"strconv"
"strings"
"github.com/prometheus/procfs/internal/util"
)
// NetClassIface contains info from files in /sys/class/net/<iface>
// for single interface (iface).
type NetClassIface struct {
Name string // Interface name
AddrAssignType *int64 `fileName:"addr_assign_type"` // /sys/class/net/<iface>/addr_assign_type
AddrLen *int64 `fileName:"addr_len"` // /sys/class/net/<iface>/addr_len
Address string `fileName:"address"` // /sys/class/net/<iface>/address
Broadcast string `fileName:"broadcast"` // /sys/class/net/<iface>/broadcast
Carrier *int64 `fileName:"carrier"` // /sys/class/net/<iface>/carrier
CarrierChanges *int64 `fileName:"carrier_changes"` // /sys/class/net/<iface>/carrier_changes
CarrierUpCount *int64 `fileName:"carrier_up_count"` // /sys/class/net/<iface>/carrier_up_count
CarrierDownCount *int64 `fileName:"carrier_down_count"` // /sys/class/net/<iface>/carrier_down_count
DevID *int64 `fileName:"dev_id"` // /sys/class/net/<iface>/dev_id
Dormant *int64 `fileName:"dormant"` // /sys/class/net/<iface>/dormant
Duplex string `fileName:"duplex"` // /sys/class/net/<iface>/duplex
Flags *int64 `fileName:"flags"` // /sys/class/net/<iface>/flags
IfAlias string `fileName:"ifalias"` // /sys/class/net/<iface>/ifalias
IfIndex *int64 `fileName:"ifindex"` // /sys/class/net/<iface>/ifindex
IfLink *int64 `fileName:"iflink"` // /sys/class/net/<iface>/iflink
LinkMode *int64 `fileName:"link_mode"` // /sys/class/net/<iface>/link_mode
MTU *int64 `fileName:"mtu"` // /sys/class/net/<iface>/mtu
NameAssignType *int64 `fileName:"name_assign_type"` // /sys/class/net/<iface>/name_assign_type
NetDevGroup *int64 `fileName:"netdev_group"` // /sys/class/net/<iface>/netdev_group
OperState string `fileName:"operstate"` // /sys/class/net/<iface>/operstate
PhysPortID string `fileName:"phys_port_id"` // /sys/class/net/<iface>/phys_port_id
PhysPortName string `fileName:"phys_port_name"` // /sys/class/net/<iface>/phys_port_name
PhysSwitchID string `fileName:"phys_switch_id"` // /sys/class/net/<iface>/phys_switch_id
Speed *int64 `fileName:"speed"` // /sys/class/net/<iface>/speed
TxQueueLen *int64 `fileName:"tx_queue_len"` // /sys/class/net/<iface>/tx_queue_len
Type *int64 `fileName:"type"` // /sys/class/net/<iface>/type
}
// NetClass is collection of info for every interface (iface) in /sys/class/net. The map keys
// are interface (iface) names.
type NetClass map[string]NetClassIface
// NewNetClass returns info for all net interfaces (iface) read from /sys/class/net/<iface>.
func NewNetClass() (NetClass, error) {
fs, err := NewFS(DefaultMountPoint)
if err != nil {
return nil, err
}
return fs.NewNetClass()
}
// NewNetClass returns info for all net interfaces (iface) read from /sys/class/net/<iface>.
func (fs FS) NewNetClass() (NetClass, error) {
path := fs.Path("class/net")
devices, err := ioutil.ReadDir(path)
if err != nil {
return NetClass{}, fmt.Errorf("cannot access %s dir %s", path, err)
}
netClass := NetClass{}
for _, deviceDir := range devices {
if deviceDir.Mode().IsRegular() {
continue
}
interfaceClass, err := netClass.parseNetClassIface(path + "/" + deviceDir.Name())
if err != nil {
return nil, err
}
interfaceClass.Name = deviceDir.Name()
netClass[deviceDir.Name()] = *interfaceClass
}
return netClass, nil
}
// parseNetClassIface scans predefined files in /sys/class/net/<iface>
// directory and gets their contents.
func (nc NetClass) parseNetClassIface(devicePath string) (*NetClassIface, error) {
interfaceClass := NetClassIface{}
interfaceElem := reflect.ValueOf(&interfaceClass).Elem()
interfaceType := reflect.TypeOf(interfaceClass)
//start from 1 - skip the Name field
for i := 1; i < interfaceElem.NumField(); i++ {
fieldType := interfaceType.Field(i)
fieldValue := interfaceElem.Field(i)
if fieldType.Tag.Get("fileName") == "" {
panic(fmt.Errorf("field %s does not have a filename tag", fieldType.Name))
}
value, err := util.SysReadFile(devicePath + "/" + fieldType.Tag.Get("fileName"))
if err != nil {
if os.IsNotExist(err) || err.Error() == "operation not supported" || err.Error() == "invalid argument" {
continue
}
return nil, fmt.Errorf("could not access file %s: %s", fieldType.Tag.Get("fileName"), err)
}
switch fieldValue.Kind() {
case reflect.String:
fieldValue.SetString(value)
case reflect.Ptr:
var int64ptr *int64
switch fieldValue.Type() {
case reflect.TypeOf(int64ptr):
var intValue int64
if strings.HasPrefix(value, "0x") {
intValue, err = strconv.ParseInt(value[2:], 16, 64)
if err != nil {
return nil, fmt.Errorf("expected hex value for %s, got: %s", fieldType.Name, value)
}
} else {
intValue, err = strconv.ParseInt(value, 10, 64)
if err != nil {
return nil, fmt.Errorf("expected Uint64 value for %s, got: %s", fieldType.Name, value)
}
}
fieldValue.Set(reflect.ValueOf(&intValue))
default:
return nil, fmt.Errorf("unhandled pointer type %q", fieldValue.Type())
}
default:
return nil, fmt.Errorf("unhandled type %q", fieldValue.Kind())
}
}
return &interfaceClass, nil
}
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