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Sockopt: Fix Darwin (macOS, iOS...) UDP interface bind #4530

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Merged
RPRX merged 1 commit into from
Mar 31, 2025
Merged

Sockopt: Fix Darwin (macOS, iOS...) UDP interface bind #4530

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73 changes: 35 additions & 38 deletions transport/internet/sockopt_darwin.go
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
package internet

import (
network "net"
gonet "net"
"os"
"syscall"
"unsafe"
Expand Down Expand Up @@ -108,14 +108,6 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
return err
}
}
if config.Interface != "" {
InterfaceIndex := getInterfaceIndexByName(config.Interface)
if InterfaceIndex != 0 {
if err := unix.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, InterfaceIndex); err != nil {
return errors.New("failed to set Interface").Base(err)
}
}
}

if config.TcpKeepAliveIdle > 0 || config.TcpKeepAliveInterval > 0 {
if config.TcpKeepAliveIdle > 0 {
Expand All @@ -138,6 +130,23 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
}
}

if config.Interface != "" {
iface, err := gonet.InterfaceByName(config.Interface)

if err != nil {
return errors.New("failed to get interface ", config.Interface).Base(err)
}
if network == "tcp6" || network == "udp6" {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_BOUND_IF, iface.Index); err != nil {
return errors.New("failed to set IPV6_BOUND_IF").Base(err)
}
} else {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_BOUND_IF, iface.Index); err != nil {
return errors.New("failed to set IP_BOUND_IF").Base(err)
}
}
}

return nil
}

Expand All @@ -152,14 +161,6 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
return err
}
}
if config.Interface != "" {
InterfaceIndex := getInterfaceIndexByName(config.Interface)
if InterfaceIndex != 0 {
if err := unix.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, InterfaceIndex); err != nil {
return errors.New("failed to set Interface").Base(err)
}
}
}

if config.TcpKeepAliveIdle > 0 || config.TcpKeepAliveInterval > 0 {
if config.TcpKeepAliveIdle > 0 {
Expand All @@ -182,6 +183,23 @@ func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig)
}
}

if config.Interface != "" {
iface, err := gonet.InterfaceByName(config.Interface)

if err != nil {
return errors.New("failed to get interface ", config.Interface).Base(err)
}
if network == "tcp6" || network == "udp6" {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_BOUND_IF, iface.Index); err != nil {
return errors.New("failed to set IPV6_BOUND_IF").Base(err)
}
} else {
if err := unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_BOUND_IF, iface.Index); err != nil {
return errors.New("failed to set IP_BOUND_IF").Base(err)
}
}
}

return nil
}

Expand Down Expand Up @@ -224,24 +242,3 @@ func setReusePort(fd uintptr) error {
}
return nil
}
func getInterfaceIndexByName(name string) int {
ifaces, err := network.Interfaces()
if err == nil {
for _, iface := range ifaces {
if (iface.Flags&network.FlagUp == network.FlagUp) && (iface.Flags&network.FlagLoopback != network.FlagLoopback) {
addrs, _ := iface.Addrs()
for _, addr := range addrs {
if ipnet, ok := addr.(*network.IPNet); ok && !ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
if iface.Name == name {
return iface.Index
}
}
}
}
}

}
}
return 0
}