ginuerzh
c06ba17916
When the user specifies an IP address as the interface (e.g.
interface=10.1.1.1), GOST resolved it to its hosting interface and
called SO_BINDTODEVICE on it — breaking outbound connectivity for
IP aliases on loopback or dummy interfaces (go-gost/gost#785).
The initial fix (caa82f2) only skipped SO_BINDTODEVICE for loopback
interfaces, missing non-loopback dummy interfaces like ip-aliases.
This change adds an isIP return value to ParseInterfaceAddr so callers
can distinguish 'user specified an IP' (intent: source IP binding for
policy routing — skip SO_BINDTODEVICE) from 'user specified an
interface name' (intent: force traffic through that NIC — keep
SO_BINDTODEVICE). The dialOnce method now only calls bindDevice when
bindToDevice is true AND the input was an interface name (!isIP).
The loopback-specific guard in bindDevice is reverted — superseded by
the broader isIP-based fix that covers all interface types.
28 lines
500 B
Go
28 lines
500 B
Go
package dialer
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import (
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"net"
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"golang.org/x/sys/unix"
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)
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func bindDevice(network, address string, fd uintptr, ifceName string) error {
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if ifceName == "" {
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return nil
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}
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host, _, _ := net.SplitHostPort(address)
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if ip := net.ParseIP(host); ip != nil && !ip.IsGlobalUnicast() {
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return nil
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}
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return unix.BindToDevice(int(fd), ifceName)
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}
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func setMark(fd uintptr, mark int) error {
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if mark == 0 {
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return nil
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}
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return unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_MARK, mark)
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}
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