Method handleGetsockname

cmd/run/engine/process/handle.go:505–542

handleGetsockname handles the getsockname(2) syscall to emulate the external connection's bind address.

(n *seccomp.Notif, fd int, addrPtr uintptr, addrSizePtr uintptr)

// handleGetsockname handles the getsockname(2) syscall to emulate the external
// connection's bind address.
func (p *Process) handleGetsockname(n *seccomp.Notif, fd int, addrPtr uintptr, addrSizePtr uintptr) error {
	s, ok := p.getSocket(fd)
	if !ok {
		return n.Skip()
	}

	bind, errno, err := s.BindAddr()
	if err != nil {
		return fmt.Errorf("get bind addr: %w", err)
	}
	if errno != 0 {
		return n.Return(0, errno)
	}

	if !bind.IsValid() {
		errno, err := p.vmWriteUint32(n, addrSizePtr, 0)
		if err != nil {
			return fmt.Errorf("write zero size: %w", err)
		}
		if errno != 0 {
			return n.Return(0, errno)
		}
		return n.Return(0, 0)
	}

	if s.Inode.Domain == unix.AF_INET6 && bind.Addr().Is4() {
		bind = netip.AddrPortFrom(netip.AddrFrom16(bind.Addr().As16()), bind.Port())
	}

	if addrPtr == 0 || addrSizePtr == 0 {
		return n.Return(0, unix.EFAULT)
	}
	errno, err = p.vmWriteSockaddr(n, bind, addrPtr, addrSizePtr)
	if err != nil {
		return fmt.Errorf("write bind addr: %w", err)
	}
	return n.Return(0, errno)
}

// handleGetpeername handles the getpeername(2) syscall to emulate the external
// connection's peer address.