51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
package updater
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import (
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"errors"
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"fmt"
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"net"
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"strings"
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)
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var (
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errRemoteHostNotFound = errors.New("remote host not found")
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)
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func extractHostFromOVPN(b []byte) (host, warning string, err error) {
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const (
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rejectIP = true
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rejectDomain = false
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)
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hosts := extractRemoteHostsFromOpenvpn(b, rejectIP, rejectDomain)
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if len(hosts) == 0 {
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return "", "", errRemoteHostNotFound
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} else if len(hosts) > 1 {
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warning = fmt.Sprintf(
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"only using the first host %q and discarding %d other hosts",
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hosts[0], len(hosts)-1)
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}
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return hosts[0], warning, nil
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}
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func extractRemoteHostsFromOpenvpn(content []byte,
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rejectIP, rejectDomain bool) (hosts []string) {
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lines := strings.Split(string(content), "\n")
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for _, line := range lines {
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if !strings.HasPrefix(line, "remote ") {
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continue
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}
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fields := strings.Fields(line)
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if len(fields) == 1 || len(fields[1]) == 0 {
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continue
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}
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host := fields[1]
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parsedIP := net.ParseIP(host)
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if (rejectIP && parsedIP != nil) ||
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(rejectDomain && parsedIP == nil) {
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continue
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}
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hosts = append(hosts, host)
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}
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return hosts
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}
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