100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
// +build !linux
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package cluster
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import "net"
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func (c *Cluster) resolveSystemAddr() (net.IP, error) {
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// Use the system's only IP address, or fail if there are
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// multiple addresses to choose from.
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interfaces, err := net.Interfaces()
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if err != nil {
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return nil, err
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}
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var systemAddr net.IP
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var systemInterface string
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// List Docker-managed subnets
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v4Subnets := c.config.NetworkSubnetsProvider.V4Subnets()
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v6Subnets := c.config.NetworkSubnetsProvider.V6Subnets()
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ifaceLoop:
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for _, intf := range interfaces {
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// Skip inactive interfaces and loopback interfaces
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if (intf.Flags&net.FlagUp == 0) || (intf.Flags&net.FlagLoopback) != 0 {
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continue
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}
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addrs, err := intf.Addrs()
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if err != nil {
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continue
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}
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var interfaceAddr4, interfaceAddr6 net.IP
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for _, addr := range addrs {
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ipAddr, ok := addr.(*net.IPNet)
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// Skip loopback and link-local addresses
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if !ok || !ipAddr.IP.IsGlobalUnicast() {
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continue
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}
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if ipAddr.IP.To4() != nil {
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// IPv4
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// Ignore addresses in subnets that are managed by Docker.
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for _, subnet := range v4Subnets {
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if subnet.Contains(ipAddr.IP) {
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continue ifaceLoop
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}
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}
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if interfaceAddr4 != nil {
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return nil, errMultipleIPs(intf.Name, intf.Name, interfaceAddr4, ipAddr.IP)
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}
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interfaceAddr4 = ipAddr.IP
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} else {
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// IPv6
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// Ignore addresses in subnets that are managed by Docker.
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for _, subnet := range v6Subnets {
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if subnet.Contains(ipAddr.IP) {
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continue ifaceLoop
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}
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}
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if interfaceAddr6 != nil {
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return nil, errMultipleIPs(intf.Name, intf.Name, interfaceAddr6, ipAddr.IP)
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}
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interfaceAddr6 = ipAddr.IP
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}
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}
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// In the case that this interface has exactly one IPv4 address
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// and exactly one IPv6 address, favor IPv4 over IPv6.
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if interfaceAddr4 != nil {
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if systemAddr != nil {
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return nil, errMultipleIPs(systemInterface, intf.Name, systemAddr, interfaceAddr4)
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}
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systemAddr = interfaceAddr4
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systemInterface = intf.Name
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} else if interfaceAddr6 != nil {
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if systemAddr != nil {
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return nil, errMultipleIPs(systemInterface, intf.Name, systemAddr, interfaceAddr6)
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}
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systemAddr = interfaceAddr6
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systemInterface = intf.Name
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}
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}
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if systemAddr == nil {
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return nil, errNoIP
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}
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return systemAddr, nil
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}
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