Sam Therapy
0b042af3e2
Some checks are pending
continuous-integration/drone/push Build is running
This fixes a problem I have had where I get the following message sometimes: Error: config, windows: The file name is too long. Delv says it is a buffer overflow so this fixes it at the cost of just allocating more memory. TODO: Make actually good Reviewed-on: #166 Reviewed-by: grumbulon <grumbulon@grumbulon.xyz>
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
// SPDX-License-Identifier: BSD-3-Clause
|
|
//go:build windows
|
|
|
|
package conf
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
"unsafe"
|
|
|
|
"github.com/miekg/dns"
|
|
"golang.org/x/sys/windows"
|
|
)
|
|
|
|
/*
|
|
"Stolen" from
|
|
https://gist.github.com/moloch--/9fb1c8497b09b45c840fe93dd23b1e98
|
|
*/
|
|
|
|
// GetDNSConfig (Windows version) returns all DNS server addresses using windows fuckery.
|
|
//
|
|
// Here be dragons.
|
|
func GetDNSConfig() (*dns.ClientConfig, error) {
|
|
length := uint32(100000)
|
|
byt := make([]byte, length)
|
|
|
|
// Windows is an utter fucking trash fire of an operating system.
|
|
//nolint:gosec // This is necessary unless we want to drop 1.18
|
|
if err := windows.GetAdaptersAddresses(windows.AF_UNSPEC, windows.GAA_FLAG_INCLUDE_PREFIX, 0, (*windows.IpAdapterAddresses)(unsafe.Pointer(&byt[0])), &length); err != nil {
|
|
return nil, fmt.Errorf("config, windows: %w", err)
|
|
}
|
|
|
|
var addresses []*windows.IpAdapterAddresses
|
|
//nolint:gosec // This is necessary unless we want to drop 1.18
|
|
for addr := (*windows.IpAdapterAddresses)(unsafe.Pointer(&byt[0])); addr != nil; addr = addr.Next {
|
|
addresses = append(addresses, addr)
|
|
}
|
|
|
|
resolvers := map[string]bool{}
|
|
|
|
for _, addr := range addresses {
|
|
for next := addr.FirstUnicastAddress; next != nil; next = next.Next {
|
|
if addr.OperStatus != windows.IfOperStatusUp {
|
|
continue
|
|
}
|
|
|
|
if next.Address.IP() != nil {
|
|
for dnsServer := addr.FirstDnsServerAddress; dnsServer != nil; dnsServer = dnsServer.Next {
|
|
ip := dnsServer.Address.IP()
|
|
|
|
if ip.IsMulticast() || ip.IsLinkLocalMulticast() || ip.IsLinkLocalUnicast() || ip.IsUnspecified() {
|
|
continue
|
|
}
|
|
|
|
if ip.To16() != nil && strings.HasPrefix(ip.To16().String(), "fec0:") {
|
|
continue
|
|
}
|
|
|
|
resolvers[ip.String()] = true
|
|
}
|
|
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
// Take unique values only
|
|
servers := []string{}
|
|
for server := range resolvers {
|
|
servers = append(servers, server)
|
|
}
|
|
|
|
// TODO: Make configurable, based on defaults in https://github.com/miekg/dns/blob/master/clientconfig.go
|
|
return &dns.ClientConfig{
|
|
Servers: servers,
|
|
Search: []string{},
|
|
Port: "53",
|
|
Ndots: 1,
|
|
Timeout: 5,
|
|
Attempts: 1,
|
|
}, nil
|
|
}
|