Updated vendor for exported BuildArgs

vendor/github.com/docker/libnetwork/netutils/utils.go

@@ -0,0 +1,194 @@
+// Network utility functions.
+
+package netutils
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+
+	"github.com/docker/libnetwork/types"
+)
+
+var (
+	// ErrNetworkOverlapsWithNameservers preformatted error
+	ErrNetworkOverlapsWithNameservers = errors.New("requested network overlaps with nameserver")
+	// ErrNetworkOverlaps preformatted error
+	ErrNetworkOverlaps = errors.New("requested network overlaps with existing network")
+	// ErrNoDefaultRoute preformatted error
+	ErrNoDefaultRoute = errors.New("no default route")
+)
+
+// CheckNameserverOverlaps checks whether the passed network overlaps with any of the nameservers
+func CheckNameserverOverlaps(nameservers []string, toCheck *net.IPNet) error {
+	if len(nameservers) > 0 {
+		for _, ns := range nameservers {
+			_, nsNetwork, err := net.ParseCIDR(ns)
+			if err != nil {
+				return err
+			}
+			if NetworkOverlaps(toCheck, nsNetwork) {
+				return ErrNetworkOverlapsWithNameservers
+			}
+		}
+	}
+	return nil
+}
+
+// NetworkOverlaps detects overlap between one IPNet and another
+func NetworkOverlaps(netX *net.IPNet, netY *net.IPNet) bool {
+	return netX.Contains(netY.IP) || netY.Contains(netX.IP)
+}
+
+// NetworkRange calculates the first and last IP addresses in an IPNet
+func NetworkRange(network *net.IPNet) (net.IP, net.IP) {
+	if network == nil {
+		return nil, nil
+	}
+
+	firstIP := network.IP.Mask(network.Mask)
+	lastIP := types.GetIPCopy(firstIP)
+	for i := 0; i < len(firstIP); i++ {
+		lastIP[i] = firstIP[i] | ^network.Mask[i]
+	}
+
+	if network.IP.To4() != nil {
+		firstIP = firstIP.To4()
+		lastIP = lastIP.To4()
+	}
+
+	return firstIP, lastIP
+}
+
+// GetIfaceAddr returns the first IPv4 address and slice of IPv6 addresses for the specified network interface
+func GetIfaceAddr(name string) (net.Addr, []net.Addr, error) {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return nil, nil, err
+	}
+	addrs, err := iface.Addrs()
+	if err != nil {
+		return nil, nil, err
+	}
+	var addrs4 []net.Addr
+	var addrs6 []net.Addr
+	for _, addr := range addrs {
+		ip := (addr.(*net.IPNet)).IP
+		if ip4 := ip.To4(); ip4 != nil {
+			addrs4 = append(addrs4, addr)
+		} else if ip6 := ip.To16(); len(ip6) == net.IPv6len {
+			addrs6 = append(addrs6, addr)
+		}
+	}
+	switch {
+	case len(addrs4) == 0:
+		return nil, nil, fmt.Errorf("Interface %v has no IPv4 addresses", name)
+	case len(addrs4) > 1:
+		fmt.Printf("Interface %v has more than 1 IPv4 address. Defaulting to using %v\n",
+			name, (addrs4[0].(*net.IPNet)).IP)
+	}
+	return addrs4[0], addrs6, nil
+}
+
+func genMAC(ip net.IP) net.HardwareAddr {
+	hw := make(net.HardwareAddr, 6)
+	// The first byte of the MAC address has to comply with these rules:
+	// 1. Unicast: Set the least-significant bit to 0.
+	// 2. Address is locally administered: Set the second-least-significant bit (U/L) to 1.
+	hw[0] = 0x02
+	// The first 24 bits of the MAC represent the Organizationally Unique Identifier (OUI).
+	// Since this address is locally administered, we can do whatever we want as long as
+	// it doesn't conflict with other addresses.
+	hw[1] = 0x42
+	// Fill the remaining 4 bytes based on the input
+	if ip == nil {
+		rand.Read(hw[2:])
+	} else {
+		copy(hw[2:], ip.To4())
+	}
+	return hw
+}
+
+// GenerateRandomMAC returns a new 6-byte(48-bit) hardware address (MAC)
+func GenerateRandomMAC() net.HardwareAddr {
+	return genMAC(nil)
+}
+
+// GenerateMACFromIP returns a locally administered MAC address where the 4 least
+// significant bytes are derived from the IPv4 address.
+func GenerateMACFromIP(ip net.IP) net.HardwareAddr {
+	return genMAC(ip)
+}
+
+// GenerateRandomName returns a new name joined with a prefix.  This size
+// specified is used to truncate the randomly generated value
+func GenerateRandomName(prefix string, size int) (string, error) {
+	id := make([]byte, 32)
+	if _, err := io.ReadFull(rand.Reader, id); err != nil {
+		return "", err
+	}
+	return prefix + hex.EncodeToString(id)[:size], nil
+}
+
+// ReverseIP accepts a V4 or V6 IP string in the canonical form and returns a reversed IP in
+// the dotted decimal form . This is used to setup the IP to service name mapping in the optimal
+// way for the DNS PTR queries.
+func ReverseIP(IP string) string {
+	var reverseIP []string
+
+	if net.ParseIP(IP).To4() != nil {
+		reverseIP = strings.Split(IP, ".")
+		l := len(reverseIP)
+		for i, j := 0, l-1; i < l/2; i, j = i+1, j-1 {
+			reverseIP[i], reverseIP[j] = reverseIP[j], reverseIP[i]
+		}
+	} else {
+		reverseIP = strings.Split(IP, ":")
+
+		// Reversed IPv6 is represented in dotted decimal instead of the typical
+		// colon hex notation
+		for key := range reverseIP {
+			if len(reverseIP[key]) == 0 { // expand the compressed 0s
+				reverseIP[key] = strings.Repeat("0000", 8-strings.Count(IP, ":"))
+			} else if len(reverseIP[key]) < 4 { // 0-padding needed
+				reverseIP[key] = strings.Repeat("0", 4-len(reverseIP[key])) + reverseIP[key]
+			}
+		}
+
+		reverseIP = strings.Split(strings.Join(reverseIP, ""), "")
+
+		l := len(reverseIP)
+		for i, j := 0, l-1; i < l/2; i, j = i+1, j-1 {
+			reverseIP[i], reverseIP[j] = reverseIP[j], reverseIP[i]
+		}
+	}
+
+	return strings.Join(reverseIP, ".")
+}
+
+// ParseAlias parses and validates the specified string as an alias format (name:alias)
+func ParseAlias(val string) (string, string, error) {
+	if val == "" {
+		return "", "", errors.New("empty string specified for alias")
+	}
+	arr := strings.Split(val, ":")
+	if len(arr) > 2 {
+		return "", "", fmt.Errorf("bad format for alias: %s", val)
+	}
+	if len(arr) == 1 {
+		return val, val, nil
+	}
+	return arr[0], arr[1], nil
+}
+
+// ValidateAlias validates that the specified string has a valid alias format (containerName:alias).
+func ValidateAlias(val string) (string, error) {
+	if _, _, err := ParseAlias(val); err != nil {
+		return val, err
+	}
+	return val, nil
+}

vendor/github.com/docker/libnetwork/netutils/utils_freebsd.go

@@ -0,0 +1,23 @@
+package netutils
+
+import (
+	"net"
+
+	"github.com/docker/libnetwork/types"
+)
+
+// ElectInterfaceAddresses looks for an interface on the OS with the specified name
+// and returns returns all its IPv4 and IPv6 addresses in CIDR notation.
+// If a failure in retrieving the addresses or no IPv4 address is found, an error is returned.
+// If the interface does not exist, it chooses from a predefined
+// list the first IPv4 address which does not conflict with other
+// interfaces on the system.
+func ElectInterfaceAddresses(name string) ([]*net.IPNet, []*net.IPNet, error) {
+	return nil, nil, types.NotImplementedErrorf("not supported on freebsd")
+}
+
+// FindAvailableNetwork returns a network from the passed list which does not
+// overlap with existing interfaces in the system
+func FindAvailableNetwork(list []*net.IPNet) (*net.IPNet, error) {
+	return nil, types.NotImplementedErrorf("not supported on freebsd")
+}

vendor/github.com/docker/libnetwork/netutils/utils_linux.go

@@ -0,0 +1,126 @@
+// +build linux
+// Network utility functions.
+
+package netutils
+
+import (
+	"fmt"
+	"net"
+	"strings"
+
+	"github.com/docker/libnetwork/ipamutils"
+	"github.com/docker/libnetwork/ns"
+	"github.com/docker/libnetwork/osl"
+	"github.com/docker/libnetwork/resolvconf"
+	"github.com/docker/libnetwork/types"
+	"github.com/vishvananda/netlink"
+)
+
+var (
+	networkGetRoutesFct func(netlink.Link, int) ([]netlink.Route, error)
+)
+
+// CheckRouteOverlaps checks whether the passed network overlaps with any existing routes
+func CheckRouteOverlaps(toCheck *net.IPNet) error {
+	if networkGetRoutesFct == nil {
+		networkGetRoutesFct = ns.NlHandle().RouteList
+	}
+	networks, err := networkGetRoutesFct(nil, netlink.FAMILY_V4)
+	if err != nil {
+		return err
+	}
+	for _, network := range networks {
+		if network.Dst != nil && NetworkOverlaps(toCheck, network.Dst) {
+			return ErrNetworkOverlaps
+		}
+	}
+	return nil
+}
+
+// GenerateIfaceName returns an interface name using the passed in
+// prefix and the length of random bytes. The api ensures that the
+// there are is no interface which exists with that name.
+func GenerateIfaceName(nlh *netlink.Handle, prefix string, len int) (string, error) {
+	linkByName := netlink.LinkByName
+	if nlh != nil {
+		linkByName = nlh.LinkByName
+	}
+	for i := 0; i < 3; i++ {
+		name, err := GenerateRandomName(prefix, len)
+		if err != nil {
+			continue
+		}
+		_, err = linkByName(name)
+		if err != nil {
+			if strings.Contains(err.Error(), "not found") {
+				return name, nil
+			}
+			return "", err
+		}
+	}
+	return "", types.InternalErrorf("could not generate interface name")
+}
+
+// ElectInterfaceAddresses looks for an interface on the OS with the
+// specified name and returns returns all its IPv4 and IPv6 addresses in CIDR notation.
+// If a failure in retrieving the addresses or no IPv4 address is found, an error is returned.
+// If the interface does not exist, it chooses from a predefined
+// list the first IPv4 address which does not conflict with other
+// interfaces on the system.
+func ElectInterfaceAddresses(name string) ([]*net.IPNet, []*net.IPNet, error) {
+	var (
+		v4Nets []*net.IPNet
+		v6Nets []*net.IPNet
+	)
+
+	defer osl.InitOSContext()()
+
+	link, _ := ns.NlHandle().LinkByName(name)
+	if link != nil {
+		v4addr, err := ns.NlHandle().AddrList(link, netlink.FAMILY_V4)
+		if err != nil {
+			return nil, nil, err
+		}
+		v6addr, err := ns.NlHandle().AddrList(link, netlink.FAMILY_V6)
+		if err != nil {
+			return nil, nil, err
+		}
+		for _, nlAddr := range v4addr {
+			v4Nets = append(v4Nets, nlAddr.IPNet)
+		}
+		for _, nlAddr := range v6addr {
+			v6Nets = append(v6Nets, nlAddr.IPNet)
+		}
+	}
+
+	if link == nil || len(v4Nets) == 0 {
+		// Choose from predefined broad networks
+		v4Net, err := FindAvailableNetwork(ipamutils.PredefinedBroadNetworks)
+		if err != nil {
+			return nil, nil, err
+		}
+		v4Nets = append(v4Nets, v4Net)
+	}
+
+	return v4Nets, v6Nets, nil
+}
+
+// FindAvailableNetwork returns a network from the passed list which does not
+// overlap with existing interfaces in the system
+func FindAvailableNetwork(list []*net.IPNet) (*net.IPNet, error) {
+	// We don't check for an error here, because we don't really care if we
+	// can't read /etc/resolv.conf. So instead we skip the append if resolvConf
+	// is nil. It either doesn't exist, or we can't read it for some reason.
+	var nameservers []string
+	if rc, err := resolvconf.Get(); err == nil {
+		nameservers = resolvconf.GetNameserversAsCIDR(rc.Content)
+	}
+	for _, nw := range list {
+		if err := CheckNameserverOverlaps(nameservers, nw); err == nil {
+			if err := CheckRouteOverlaps(nw); err == nil {
+				return nw, nil
+			}
+		}
+	}
+	return nil, fmt.Errorf("no available network")
+}

vendor/github.com/docker/libnetwork/netutils/utils_windows.go

@@ -0,0 +1,25 @@
+package netutils
+
+import (
+	"net"
+
+	"github.com/docker/libnetwork/types"
+)
+
+// ElectInterfaceAddresses looks for an interface on the OS with the specified name
+// and returns returns all its IPv4 and IPv6 addresses in CIDR notation.
+// If a failure in retrieving the addresses or no IPv4 address is found, an error is returned.
+// If the interface does not exist, it chooses from a predefined
+// list the first IPv4 address which does not conflict with other
+// interfaces on the system.
+func ElectInterfaceAddresses(name string) ([]*net.IPNet, []*net.IPNet, error) {
+	return nil, nil, types.NotImplementedErrorf("not supported on windows")
+}
+
+// FindAvailableNetwork returns a network from the passed list which does not
+// overlap with existing interfaces in the system
+
+// TODO : Use appropriate windows APIs to identify non-overlapping subnets
+func FindAvailableNetwork(list []*net.IPNet) (*net.IPNet, error) {
+	return nil, nil
+}