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package wireguard
import (
"io/fs"
"strconv"
"asciigoat.org/ini/basic"
"darvaza.org/core"
)
type sectionHandler func(*Config, *basic.Section) error
var sectionMap = map[string]func(*Config, *basic.Section) error{
"Interface": loadInterfaceConfSection,
"Peer": loadPeerConfSection,
}
func loadConfSection(out *Config, src *basic.Section) error {
h, ok := sectionMap[src.Key]
if !ok {
return core.Wrap(fs.ErrInvalid, "unknown section %q", src.Key)
}
return h(out, src)
}
func loadInterfaceConfSection(out *Config, src *basic.Section) error {
var cfg InterfaceConfig
for _, field := range src.Fields {
if err := loadInterfaceConfField(&cfg, field); err != nil {
return core.Wrap(err, "Interface")
}
}
out.Interface = cfg
return nil
}
func loadPeerConfSection(out *Config, src *basic.Section) error {
var cfg PeerConfig
for _, field := range src.Fields {
if err := loadPeerConfField(&cfg, field); err != nil {
return core.Wrap(err, "Peer[%v]", len(out.Peer))
}
}
out.Peer = append(out.Peer, cfg)
return nil
}
// revive:disable:cyclomatic
// revive:disable:cognitive-complexity
func loadInterfaceConfField(cfg *InterfaceConfig, field basic.Field) error {
// revive:enable:cyclomatic
// revive:enable:cognitive-complexity
// TODO: refactor when asciigoat's ini parser learns to do reflection
switch field.Key {
case "Address":
if !core.IsZero(cfg.Address) {
return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
}
err := cfg.Address.UnmarshalText([]byte(field.Value))
switch {
case err != nil:
return core.Wrap(err, field.Key)
default:
return nil
}
case "PrivateKey":
if !core.IsZero(cfg.PrivateKey) {
return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
}
err := cfg.PrivateKey.UnmarshalText([]byte(field.Value))
switch {
case err != nil:
return core.Wrap(err, field.Key)
default:
return nil
}
case "ListenPort":
if cfg.ListenPort > 0 {
return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
}
u64, err := strconv.ParseUint(field.Value, 10, 16)
switch {
case err != nil:
return core.Wrap(err, field.Key)
case u64 == 0:
return core.Wrap(fs.ErrInvalid, "invalid %q value", field.Key)
default:
cfg.ListenPort = uint16(u64)
return nil
}
default:
return core.Wrap(fs.ErrInvalid, "unknown field %q", field.Key)
}
}
// revive:disable:cyclomatic
// revive:disable:cognitive-complexity
func loadPeerConfField(cfg *PeerConfig, field basic.Field) error {
// revive:enable:cyclomatic
// revive:enable:cognitive-complexity
switch field.Key {
case "PublicKey":
if !core.IsZero(cfg.PublicKey) {
return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
}
err := cfg.PublicKey.UnmarshalText([]byte(field.Value))
switch {
case err != nil:
return core.Wrap(err, field.Key)
default:
return nil
}
case "Endpoint":
if cfg.Endpoint.String() != "" {
return core.Wrap(fs.ErrInvalid, "duplicate field %q", field.Key)
}
err := cfg.Endpoint.UnmarshalText([]byte(field.Value))
switch {
case err != nil:
return core.Wrap(err, field.Key)
default:
return nil
}
case "AllowedIPs":
s, err := parseAllowedIPs(field.Value)
switch {
case err != nil:
return core.Wrap(err, field.Key)
case len(s) > 0:
cfg.AllowedIPs = append(cfg.AllowedIPs, s...)
return nil
}
default:
return core.Wrap(fs.ErrInvalid, "unknown field %q", field.Key)
}
return nil
}
func newConfigFromDocument(doc *basic.Document) (*Config, error) {
var out Config
if len(doc.Global) > 0 {
err := core.Wrap(fs.ErrInvalid, "fields before the first section")
return nil, err
}
for i := range doc.Sections {
src := &doc.Sections[i]
if err := loadConfSection(&out, src); err != nil {
return nil, err
}
}
return &out, nil
}