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|
package wgconf
import (
"bufio"
"fmt"
"os"
"strings"
)
// Config represents a parsed WireGuard configuration file.
type Config struct {
PrivateKey string
Address string
DNS string
Peers []Peer
}
// Peer represents a WireGuard peer.
type Peer struct {
PublicKey string
Endpoint string
AllowedIPs []string
}
// Parse reads a WireGuard .conf file and returns a Config struct.
func Parse(path string) (*Config, error) {
file, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("failed to open config file: %w", err)
}
defer func() {
if err := file.Close(); err != nil {
// We use a simple print here because we are in a defer
fmt.Printf("warning: failed to close config file %s: %v\n", path, err)
}
}()
cfg := &Config{}
var currentPeer *Peer
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" || strings.HasPrefix(line, "#") {
continue
}
if strings.HasPrefix(line, "[") {
section := strings.Trim(line, "[]")
if section == "Peer" {
if currentPeer != nil {
cfg.Peers = append(cfg.Peers, *currentPeer)
}
currentPeer = &Peer{}
}
continue
}
parts := strings.SplitN(line, "=", 2)
if len(parts) != 2 {
return nil, fmt.Errorf("invalid line format: %s", line)
}
key := strings.TrimSpace(parts[0])
val := strings.TrimSpace(parts[1])
if currentPeer != nil {
switch key {
case "PublicKey":
currentPeer.PublicKey = val
case "Endpoint":
currentPeer.Endpoint = val
case "AllowedIPs":
currentPeer.AllowedIPs = strings.Split(val, ",")
}
} else {
switch key {
case "PrivateKey":
cfg.PrivateKey = val
case "Address":
cfg.Address = val
case "DNS":
cfg.DNS = val
}
}
}
if currentPeer != nil {
cfg.Peers = append(cfg.Peers, *currentPeer)
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("error reading config file: %w", err)
}
return cfg, nil
}
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