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// This file is part of gnunet-go, a GNUnet-implementation in Golang.
// Copyright (C) 2019-2022 Bernd Fix >Y<
//
// gnunet-go is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// gnunet-go is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: AGPL3.0-or-later
package util
import (
"bytes"
"fmt"
"net"
"strings"
)
// Address specifies how a peer is reachable on the network.
type Address struct {
Netw string // network protocol
Options uint32 // address options
Expires AbsoluteTime // expiration date for address
Address []byte // address data (protocol-dependent)
}
// NewAddress returns a new Address for the given transport and specs
func NewAddress(transport string, addr string) *Address {
return &Address{
Netw: transport,
Options: 0,
Address: Clone([]byte(addr)),
Expires: AbsoluteTimeNever(),
}
}
// NewAddressWrap returns new address from net.Addr with no options
// or expiry date.
func NewAddressWrap(addr net.Addr) *Address {
return &Address{
Netw: addr.Network(),
Options: 0,
Address: []byte(addr.String()),
Expires: AbsoluteTimeNever(),
}
}
// ParseAddress translates a GNUnet address string like
// "ip+udp://1.2.3.4:6789" or "gnunet+tcp://12.3.4.5/".
// It can also handle standard strings like "udp:127.0.0.1:6735".
func ParseAddress(s string) (addr *Address, err error) {
p := strings.SplitN(s, ":", 2)
if len(p) != 2 {
err = fmt.Errorf("invalid address format: '%s'", s)
return
}
addr = NewAddress(p[0], strings.Trim(p[1], "/"))
return
}
// Equals return true if two addresses match.
func (a *Address) Equals(b *Address) bool {
return a.Netw == b.Netw &&
a.Options == b.Options &&
bytes.Equal(a.Address, b.Address)
}
// implement net.Addr interface methods:
// String returns a human-readable representation of an address.
func (a *Address) String() string {
return string(a.Address)
}
// Network returns the protocol specifier.
func (a *Address) Network() string {
return a.Netw
}
//----------------------------------------------------------------------
// URI returns a string representation of an address.
func (a *Address) URI() string {
return URI(a.Netw, a.Address)
}
func URI(network string, addr []byte) string {
return network + "://" + string(addr)
}
//----------------------------------------------------------------------
// PeerAddrList is a list of addresses per peer ID.
type PeerAddrList struct {
list *Map[string, []*Address]
}
// NewPeerAddrList returns a new and empty address list.
func NewPeerAddrList() *PeerAddrList {
return &PeerAddrList{
list: NewMap[string, []*Address](),
}
}
// Add address for peer. The returned mode is 0=not added, 1=new peer,
// 2=new address
func (a *PeerAddrList) Add(peer *PeerID, addr *Address) (mode int) {
// check for expired address.
mode = 0
if !addr.Expires.Expired() {
// run add operation
_ = a.list.Process(func(pid int) error {
id := peer.String()
list, ok := a.list.Get(id, pid)
if !ok {
list = make([]*Address, 0)
mode = 1
} else {
for _, a := range list {
if a.Equals(addr) {
return nil
}
}
mode = 2
}
list = append(list, addr)
a.list.Put(id, list, pid)
return nil
}, false)
}
return
}
// Get address for peer
func (a *PeerAddrList) Get(peer *PeerID, transport string) (res []*Address) {
id := peer.String()
list, ok := a.list.Get(id, 0)
if ok {
for _, addr := range list {
// check for expired address.
if addr.Expires.Expired() {
// skip expired
continue
}
// check for matching protocol
if len(transport) > 0 && transport != addr.Netw {
// skip other transports
continue
}
res = append(res, addr)
}
}
return
}
// Delete a list entry by key.
func (a *PeerAddrList) Delete(peer *PeerID) {
a.list.Delete(peer.String(), 0)
}
// Contains checks if a peer is contained in the list. Does not check
// for expired entries.
func (a *PeerAddrList) Contains(peer *PeerID) (ok bool) {
_, ok = a.list.Get(peer.String(), 0)
return
}
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