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dbus_linux.go
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dbus_linux.go
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// +build !server
package netenv
import (
"errors"
"fmt"
"net"
"sync"
"github.com/godbus/dbus"
)
var (
dbusConn *dbus.Conn
dbusConnLock sync.Mutex
)
func getNameserversFromDbus() ([]Nameserver, error) { //nolint:gocognit // TODO
// cmdline tool for exploring: gdbus introspect --system --dest org.freedesktop.NetworkManager --object-path /org/freedesktop/NetworkManager
var nameservers []Nameserver
var err error
dbusConnLock.Lock()
defer dbusConnLock.Unlock()
if dbusConn == nil {
dbusConn, err = dbus.SystemBus()
}
if err != nil {
return nil, err
}
primaryConnectionVariant, err := getNetworkManagerProperty(dbusConn, dbus.ObjectPath("/org/freedesktop/NetworkManager"), "org.freedesktop.NetworkManager.PrimaryConnection")
if err != nil {
return nil, err
}
primaryConnection, ok := primaryConnectionVariant.Value().(dbus.ObjectPath)
if !ok {
return nil, errors.New("dbus: could not assert type of /org/freedesktop/NetworkManager:org.freedesktop.NetworkManager.PrimaryConnection")
}
activeConnectionsVariant, err := getNetworkManagerProperty(dbusConn, dbus.ObjectPath("/org/freedesktop/NetworkManager"), "org.freedesktop.NetworkManager.ActiveConnections")
if err != nil {
return nil, err
}
activeConnections, ok := activeConnectionsVariant.Value().([]dbus.ObjectPath)
if !ok {
return nil, errors.New("dbus: could not assert type of /org/freedesktop/NetworkManager:org.freedesktop.NetworkManager.ActiveConnections")
}
sortedConnections := []dbus.ObjectPath{primaryConnection}
for _, activeConnection := range activeConnections {
if !objectPathInSlice(activeConnection, sortedConnections) {
sortedConnections = append(sortedConnections, activeConnection)
}
}
for _, activeConnection := range sortedConnections {
ip4ConfigVariant, err := getNetworkManagerProperty(dbusConn, activeConnection, "org.freedesktop.NetworkManager.Connection.Active.Ip4Config")
if err != nil {
return nil, err
}
ip4Config, ok := ip4ConfigVariant.Value().(dbus.ObjectPath)
if !ok {
return nil, fmt.Errorf("dbus: could not assert type of %s:org.freedesktop.NetworkManager.Connection.Active.Ip4Config", activeConnection)
}
nameserverIP4sVariant, err := getNetworkManagerProperty(dbusConn, ip4Config, "org.freedesktop.NetworkManager.IP4Config.Nameservers")
if err != nil {
return nil, err
}
nameserverIP4s, ok := nameserverIP4sVariant.Value().([]uint32)
if !ok {
return nil, fmt.Errorf("dbus: could not assert type of %s:org.freedesktop.NetworkManager.IP4Config.Nameservers", ip4Config)
}
nameserverDomainsVariant, err := getNetworkManagerProperty(dbusConn, ip4Config, "org.freedesktop.NetworkManager.IP4Config.Domains")
if err != nil {
return nil, err
}
nameserverDomains, ok := nameserverDomainsVariant.Value().([]string)
if !ok {
return nil, fmt.Errorf("dbus: could not assert type of %s:org.freedesktop.NetworkManager.IP4Config.Domains", ip4Config)
}
nameserverSearchesVariant, err := getNetworkManagerProperty(dbusConn, ip4Config, "org.freedesktop.NetworkManager.IP4Config.Searches")
if err != nil {
return nil, err
}
nameserverSearches, ok := nameserverSearchesVariant.Value().([]string)
if !ok {
return nil, fmt.Errorf("dbus: could not assert type of %s:org.freedesktop.NetworkManager.IP4Config.Searches", ip4Config)
}
for _, ip := range nameserverIP4s {
a := uint8(ip / 16777216)
b := uint8((ip % 16777216) / 65536)
c := uint8((ip % 65536) / 256)
d := uint8(ip % 256)
nameservers = append(nameservers, Nameserver{
IP: net.IPv4(d, c, b, a),
Search: append(nameserverDomains, nameserverSearches...),
})
}
ip6ConfigVariant, err := getNetworkManagerProperty(dbusConn, activeConnection, "org.freedesktop.NetworkManager.Connection.Active.Ip6Config")
if err != nil {
return nil, err
}
ip6Config, ok := ip6ConfigVariant.Value().(dbus.ObjectPath)
if !ok {
return nil, fmt.Errorf("dbus: could not assert type of %s:org.freedesktop.NetworkManager.Connection.Active.Ip6Config", activeConnection)
}
nameserverIP6sVariant, err := getNetworkManagerProperty(dbusConn, ip6Config, "org.freedesktop.NetworkManager.IP6Config.Nameservers")
if err != nil {
return nil, err
}
nameserverIP6s, ok := nameserverIP6sVariant.Value().([][]byte)
if !ok {
return nil, fmt.Errorf("dbus: could not assert type of %s:org.freedesktop.NetworkManager.IP6Config.Nameservers", ip6Config)
}
nameserverDomainsVariant, err = getNetworkManagerProperty(dbusConn, ip6Config, "org.freedesktop.NetworkManager.IP6Config.Domains")
if err != nil {
return nil, err
}
nameserverDomains, ok = nameserverDomainsVariant.Value().([]string)
if !ok {
return nil, fmt.Errorf("dbus: could not assert type of %s:org.freedesktop.NetworkManager.IP6Config.Domains", ip6Config)
}
nameserverSearchesVariant, err = getNetworkManagerProperty(dbusConn, ip6Config, "org.freedesktop.NetworkManager.IP6Config.Searches")
if err != nil {
return nil, err
}
nameserverSearches, ok = nameserverSearchesVariant.Value().([]string)
if !ok {
return nil, fmt.Errorf("dbus: could not assert type of %s:org.freedesktop.NetworkManager.IP6Config.Searches", ip6Config)
}
for _, ip := range nameserverIP6s {
if len(ip) != 16 {
return nil, fmt.Errorf("dbus: query returned IPv6 address (%s) with invalid length", ip)
}
nameservers = append(nameservers, Nameserver{
IP: net.IP(ip),
Search: append(nameserverDomains, nameserverSearches...),
})
}
}
return nameservers, nil
}
func getConnectivityStateFromDbus() (OnlineStatus, error) {
var err error
dbusConnLock.Lock()
defer dbusConnLock.Unlock()
if dbusConn == nil {
dbusConn, err = dbus.SystemBus()
}
if err != nil {
return 0, err
}
connectivityStateVariant, err := getNetworkManagerProperty(dbusConn, dbus.ObjectPath("/org/freedesktop/NetworkManager"), "org.freedesktop.NetworkManager.Connectivity")
if err != nil {
return 0, err
}
connectivityState, ok := connectivityStateVariant.Value().(uint32)
if !ok {
return 0, errors.New("dbus: could not assert type of /org/freedesktop/NetworkManager:org.freedesktop.NetworkManager.Connectivity")
}
// NMConnectivityState
// NM_CONNECTIVITY_UNKNOWN = 0 Network connectivity is unknown.
// NM_CONNECTIVITY_NONE = 1 The host is not connected to any network.
// NM_CONNECTIVITY_PORTAL = 2 The host is behind a captive portal and cannot reach the full Internet.
// NM_CONNECTIVITY_LIMITED = 3 The host is connected to a network, but does not appear to be able to reach the full Internet.
// NM_CONNECTIVITY_FULL = 4 The host is connected to a network, and appears to be able to reach the full Internet.
switch connectivityState {
case 0:
return StatusUnknown, nil
case 1:
return StatusOffline, nil
case 2:
return StatusPortal, nil
case 3:
return StatusLimited, nil
case 4:
return StatusOnline, nil
}
return StatusUnknown, nil
}
func getNetworkManagerProperty(conn *dbus.Conn, objectPath dbus.ObjectPath, property string) (dbus.Variant, error) {
object := conn.Object("org.freedesktop.NetworkManager", objectPath)
return object.GetProperty(property)
}
func objectPathInSlice(a dbus.ObjectPath, list []dbus.ObjectPath) bool {
for _, b := range list {
if string(b) == string(a) {
return true
}
}
return false
}