aghnet

package
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 Go to latest Published: Oct 1, 2023 License: GPL-3.0 Imports: 37 Imported by: 0

Documentation

Overview

Package aghnet contains some utilities for networking.

Index

Constants

View Source 
const ErrNoHostsPaths errors.Error = "no valid paths to hosts files provided"

ErrNoHostsPaths is returned when there are no valid paths to watch passed to the HostsContainer.

View Source 
const ErrNoStaticIPInfo errors.Error = "no information about static ip"

ErrNoStaticIPInfo is returned by IfaceHasStaticIP when no information about the IP being static is available.

Variables

This section is empty.

Functions

func BroadcastFromPref 

func BroadcastFromPref(p netip.Prefix) (bc netip.Addr)

BroadcastFromPref calculates the broadcast IP address for p.

func CanBindPrivilegedPorts 

func CanBindPrivilegedPorts() (can bool, err error)

CanBindPrivilegedPorts checks if current process can bind to privileged ports.

func CheckOtherDHCP 

func CheckOtherDHCP(ifaceName string) (ok4, ok6 bool, err4, err6 error)

CheckOtherDHCP tries to discover another DHCP server in the network.

func CheckPort 

func CheckPort(network string, ipp netip.AddrPort) (err error)

CheckPort checks if the port is available for binding. network is expected to be one of "udp" and "tcp".

func CollectAllIfacesAddrs 

func CollectAllIfacesAddrs() (addrs []netip.Addr, err error)

CollectAllIfacesAddrs returns the slice of all network interfaces IP addresses without port number.

func DefaultHostsPaths 

func DefaultHostsPaths() (paths []string)

DefaultHostsPaths returns the slice of paths default for the operating system to files and directories which are containing the hosts database. The result is intended to be used within fs.FS so the initial slash is omitted.

func GatewayIP 

func GatewayIP(ifaceName string) (ip netip.Addr)

GatewayIP returns IP address of interface's gateway.

TODO(e.burkov): Investigate if the gateway address may be fetched in another way since not every machine has the software installed.

func GenerateHostname 

func GenerateHostname(ip netip.Addr) (hostname string)

GenerateHostname generates the hostname from ip. In case of using IPv4 the result should be like: 

192-168-10-1

In case of using IPv6, the result is like: 

ff80-f076-0000-0000-0000-0000-0000-0010

ip must be either an IPv4 or an IPv6.

func GetSubnet 

func GetSubnet(ifaceName string) (p netip.Prefix)

GetSubnet returns the subnet corresponding to the interface of zero prefix if the search fails.

TODO(e.burkov): See TODO on GetValidNetInterfacesForWeb.

func IfaceDNSIPAddrs 

func IfaceDNSIPAddrs(
	iface NetIface,
	ipv IPVersion,
	maxAttempts int,
	backoff time.Duration,
) (addrs []net.IP, err error)

IfaceDNSIPAddrs returns IP addresses of the interface suitable to send to clients as DNS addresses. If err is nil, addrs contains either no addresses or at least two.

It makes up to maxAttempts attempts to get the addresses if there are none, each time using the provided backoff. Sometimes an interface needs a few seconds to really initialize.

See https://github.com/AdguardTeam/AdGuardHome/issues/2304.

func IfaceHasStaticIP 

func IfaceHasStaticIP(ifaceName string) (has bool, err error)

IfaceHasStaticIP checks if interface is configured to have static IP address. If it can't give a definitive answer, it returns false and an error for which errors.Is(err, ErrNoStaticIPInfo) is true.

func IfaceIPAddrs 

func IfaceIPAddrs(iface NetIface, ipv IPVersion) (ips []net.IP, err error)

IfaceIPAddrs returns the interface's IP addresses.

func IfaceSetStaticIP 

func IfaceSetStaticIP(ifaceName string) (err error)

IfaceSetStaticIP sets static IP address for network interface.

func InterfaceByIP 

func InterfaceByIP(ip netip.Addr) (ifaceName string)

InterfaceByIP returns the name of the interface bound to ip.

TODO(a.garipov, e.burkov): This function is technically incorrect, since one IP address can be shared by multiple interfaces in some configurations.

TODO(e.burkov): See TODO on GetValidNetInterfacesForWeb.

func IsAddrInUse 

func IsAddrInUse(err error) (ok bool)

IsAddrInUse checks if err is about unsuccessful address binding.

func NewDomainNameSet 

func NewDomainNameSet(list []string) (set *stringutil.Set, err error)

NewDomainNameSet returns nil and error, if list has duplicate or empty domain name. Otherwise returns a set, which contains domain names normalized using NormalizeDomain.

func NormalizeDomain 

func NormalizeDomain(host string) (norm string)

NormalizeDomain returns a lowercased version of host without the final dot, unless host is ".", in which case it returns it unchanged. That is a special case that to allow matching queries like: 

dig IN NS '.'

func ParseAddrPort 

func ParseAddrPort(s string, defaultPort uint16) (ipp netip.AddrPort, err error)

ParseAddrPort parses an netip.AddrPort from s, which should be either a valid IP, optionally with port, or a valid URL with plain IP address. The defaultPort is used if s doesn't contain port number.

Types

type DialContextFunc 

type DialContextFunc = func(ctx context.Context, network, addr string) (conn net.Conn, err error)

DialContextFunc is the semantic alias for dialing functions, such as [http.Transport.DialContext].

type HostGenFunc 

type HostGenFunc func() (host string)

HostGenFunc is the signature for functions generating fake hostnames. The implementation must be safe for concurrent use.

type Hosts 

type Hosts map[netip.Addr][]*hostsfile.Record

Hosts is a map of IP addresses to the records, as it primarily stored in the HostsContainer. It should not be accessed for writing since it may be read concurrently, users should clone it before modifying.

The order of records for each address is preserved from original files, but the order of the addresses, being a map key, is not.

TODO(e.burkov): Probably, this should be a sorted slice of records.

type HostsContainer 

type HostsContainer struct {
	// contains filtered or unexported fields
}

HostsContainer stores the relevant hosts database provided by the OS and processes both A/AAAA and PTR DNS requests for those.

func NewHostsContainer 

func NewHostsContainer(
	fsys fs.FS,
	w aghos.FSWatcher,
	paths ...string,
) (hc *HostsContainer, err error)

NewHostsContainer creates a container of hosts, that watches the paths with w. listID is used as an identifier of the underlying rules list. paths shouldn't be empty and each of paths should locate either a file or a directory in fsys. fsys and w must be non-nil.

func (*HostsContainer) Close 

func (hc *HostsContainer) Close() (err error)

Close implements the io.Closer interface for *HostsContainer. It closes both itself and its aghos.FSWatcher. Close must only be called once.

func (*HostsContainer) MatchAddr 

func (hc *HostsContainer) MatchAddr(ip netip.Addr) (recs []*hostsfile.Record)

MatchAddr returns the records for the IP address.

func (*HostsContainer) MatchName 

func (hc *HostsContainer) MatchName(name string) (recs []*hostsfile.Record)

MatchName returns the records for the hostname.

func (*HostsContainer) Upd 

func (hc *HostsContainer) Upd() (updates <-chan Hosts)

Upd returns the channel into which the updates are sent.

type IPMut 

type IPMut struct {
	// contains filtered or unexported fields
}

IPMut is a type-safe wrapper of atomic.Value to store the IPMutFunc.

func NewIPMut 

func NewIPMut(f IPMutFunc) (m *IPMut)

NewIPMut returns the new properly initialized *IPMut. The m is guaranteed to always store non-nil IPMutFunc which is safe to call.

func (*IPMut) Load 

func (m *IPMut) Load() (f IPMutFunc)

Load returns the previously stored IPMutFunc.

func (*IPMut) Store 

func (m *IPMut) Store(f IPMutFunc)

Store sets the IPMutFunc to return from Func. It's safe for concurrent use. If f is nil, the stored function is the no-op one.

type IPMutFunc 

type IPMutFunc func(ip net.IP)

IPMutFunc is the signature of a function which modifies the IP address instance. It should be safe for concurrent use.

type IPVersion 

type IPVersion = int

IPVersion is a alias for int for documentation purposes. Use it when the integer means IP version. 

const (
	IPVersion4 IPVersion = 4
	IPVersion6 IPVersion = 6
)

IP version constants.

type IgnoreEngine 

type IgnoreEngine struct {
	// contains filtered or unexported fields
}

IgnoreEngine contains the list of rules for ignoring hostnames and matches them.

TODO(s.chzhen): Move all urlfilter stuff to aghfilter.

func NewIgnoreEngine 

func NewIgnoreEngine(ignored []string) (e *IgnoreEngine, err error)

NewIgnoreEngine creates a new instance of the IgnoreEngine and stores the list of rules for ignoring hostnames.

func (*IgnoreEngine) Has 

func (e *IgnoreEngine) Has(host string) (ignore bool)

Has returns true if IgnoreEngine matches the host.

func (*IgnoreEngine) Values 

func (e *IgnoreEngine) Values() (ignored []string)

Values returns a copy of list of rules for ignoring hostnames.

type IpsetManager 

type IpsetManager interface {
	Add(host string, ip4s, ip6s []net.IP) (n int, err error)
	Close() (err error)
}

IpsetManager is the ipset manager interface.

TODO(a.garipov): Perhaps generalize this into some kind of a NetFilter type, since ipset is exclusive to Linux?

func NewIpsetManager 

func NewIpsetManager(ipsetConf []string) (mgr IpsetManager, err error)

NewIpsetManager returns a new ipset. IPv4 addresses are added to an ipset with an ipv4 family; IPv6 addresses, to an ipv6 ipset. ipset must exist.

The syntax of the ipsetConf is: 

DOMAIN[,DOMAIN].../IPSET_NAME[,IPSET_NAME]...

If ipsetConf is empty, msg and err are nil. The error is of type *aghos.UnsupportedError if the OS is not supported.

type NetIface 

type NetIface interface {
	Addrs() ([]net.Addr, error)
}

NetIface is the interface for network interface methods.

type NetInterface 

type NetInterface struct {
	// Addresses are the network interface addresses.
	Addresses []netip.Addr `json:"ip_addresses,omitempty"`
	// Subnets are the IP networks for this network interface.
	Subnets      []netip.Prefix   `json:"-"`
	Name         string           `json:"name"`
	HardwareAddr net.HardwareAddr `json:"hardware_address"`
	Flags        net.Flags        `json:"flags"`
	MTU          int              `json:"mtu"`
}

NetInterface represents an entry of network interfaces map.

func GetValidNetInterfacesForWeb 

func GetValidNetInterfacesForWeb() (nifaces []*NetInterface, err error)

GetValidNetInterfacesForWeb returns interfaces that are eligible for DNS and WEB only we do not return link-local addresses here.

TODO(e.burkov): Can't properly test the function since it's nontrivial to substitute net.Interface.Addrs and the net.InterfaceAddrs can't be used.

func NetInterfaceFrom 

func NetInterfaceFrom(iface *net.Interface) (niface *NetInterface, err error)

func (NetInterface) MarshalJSON 

func (iface NetInterface) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface for NetInterface.

type SystemResolvers 

type SystemResolvers interface {
	// Get returns the slice of local resolvers' addresses.  It must be safe for
	// concurrent use.
	Get() (rs []string)
	// contains filtered or unexported methods
}

SystemResolvers helps to work with local resolvers' addresses provided by OS.

func NewSystemResolvers 

func NewSystemResolvers(
	hostGenFunc HostGenFunc,
) (sr SystemResolvers, err error)

NewSystemResolvers returns a SystemResolvers with the cache refresh rate defined by refreshIvl. It disables auto-refreshing if refreshIvl is 0. If nil is passed for hostGenFunc, the default generator will be used.

Source Files

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