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Switch to using libnetwork's resolvconf package

Browse Source 
Libnetwork provides a well-tested package for generating
resolv.conf from the host's that has some features our current
implementation does not. Swap to using their code and remove our
built-in implementation.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
This commit is contained in:
Matthew Heon
2018-09-25 11:35:16 -04:00
parent 094b8b7350
commit e4ded6ce7f
10 changed files with 1449 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

104
libpod/container_internal.go
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@ -17,11 +17,12 @@ import (
"github.com/containers/libpod/pkg/hooks/exec"
"github.com/containers/libpod/pkg/rootless"
"github.com/containers/libpod/pkg/secrets"
"github.com/containers/libpod/pkg/util"
"github.com/containers/storage"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/chrootarchive"
"github.com/containers/storage/pkg/mount"
"github.com/docker/libnetwork/netutils"
"github.com/docker/libnetwork/resolvconf"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/opencontainers/selinux/go-selinux/label"
@ -1017,12 +1018,6 @@ func (c *Container) writeStringToRundir(destFile, output string) (string, error)
return filepath.Join(c.state.DestinationRunDir, destFile), nil
}
type resolvConf struct {
nameServers []string
searchDomains []string
options []string
}
// generateResolvConf generates a containers resolv.conf
func (c *Container) generateResolvConf() (string, error) {
// Determine the endpoint for resolv.conf in case it is a symlink
@ -1030,86 +1025,51 @@ func (c *Container) generateResolvConf() (string, error) {
if err != nil {
return "", err
}
orig, err := ioutil.ReadFile(resolvPath)
contents, err := ioutil.ReadFile(resolvPath)
if err != nil {
return "", errors.Wrapf(err, "unable to read %s", resolvPath)
}
if len(c.config.DNSServer) == 0 && len(c.config.DNSSearch) == 0 && len(c.config.DNSOption) == 0 {
return c.writeStringToRundir("resolv.conf", fmt.Sprintf("%s", orig))
// Process the file to remove localhost nameservers
// TODO: set ipv6 enable bool more sanely
resolv, err := resolvconf.FilterResolvDNS(contents, true)
if err != nil {
return "", errors.Wrapf(err, "error parsing host resolv.conf")
}
// Read and organize the hosts /etc/resolv.conf
resolv := createResolv(string(orig[:]))
// Populate the resolv struct with user's dns search domains
if len(c.config.DNSSearch) > 0 {
resolv.searchDomains = nil
// The . character means the user doesnt want any search domains in the container
if !util.StringInSlice(".", c.config.DNSSearch) {
resolv.searchDomains = append(resolv.searchDomains, c.Config().DNSSearch...)
}
}
// Populate the resolv struct with user's dns servers
// Make a new resolv.conf
nameservers := resolvconf.GetNameservers(resolv.Content, netutils.IP)
if len(c.config.DNSServer) > 0 {
resolv.nameServers = nil
for _, i := range c.config.DNSServer {
resolv.nameServers = append(resolv.nameServers, i.String())
// We store DNS servers as net.IP, so need to convert to string
nameservers = []string{}
for _, server := range c.config.DNSServer {
nameservers = append(nameservers, server.String())
}
}
// Populate the resolve struct with the users dns options
search := resolvconf.GetSearchDomains(resolv.Content)
if len(c.config.DNSSearch) > 0 {
search = c.config.DNSSearch
}
options := resolvconf.GetOptions(resolv.Content)
if len(c.config.DNSOption) > 0 {
resolv.options = nil
resolv.options = append(resolv.options, c.Config().DNSOption...)
options = c.config.DNSOption
}
return c.writeStringToRundir("resolv.conf", resolv.ToString())
}
// createResolv creates a resolv struct from an input string
func createResolv(input string) resolvConf {
var resolv resolvConf
for _, line := range strings.Split(input, "\n") {
if strings.HasPrefix(line, "search") {
fields := strings.Fields(line)
if len(fields) < 2 {
logrus.Debugf("invalid resolv.conf line %s", line)
continue
}
resolv.searchDomains = append(resolv.searchDomains, fields[1:]...)
} else if strings.HasPrefix(line, "nameserver") {
fields := strings.Fields(line)
if len(fields) < 2 {
logrus.Debugf("invalid resolv.conf line %s", line)
continue
}
resolv.nameServers = append(resolv.nameServers, fields[1])
} else if strings.HasPrefix(line, "options") {
fields := strings.Fields(line)
if len(fields) < 2 {
logrus.Debugf("invalid resolv.conf line %s", line)
continue
}
resolv.options = append(resolv.options, fields[1:]...)
}
}
return resolv
}
destPath := filepath.Join(c.state.RunDir, "resolv.conf")
//ToString returns a resolv struct in the form of a resolv.conf
func (r resolvConf) ToString() string {
var result string
// Populate the output string with search domains
result += fmt.Sprintf("search %s\n", strings.Join(r.searchDomains, " "))
// Populate the output string with name servers
for _, i := range r.nameServers {
result += fmt.Sprintf("nameserver %s\n", i)
if err := os.Remove(destPath); err != nil && !os.IsNotExist(err) {
return "", errors.Wrapf(err, "error removing resolv.conf for container %s", c.ID())
}
// Populate the output string with dns options
for _, i := range r.options {
result += fmt.Sprintf("options %s\n", i)
// Build resolv.conf
if _, err = resolvconf.Build(destPath, nameservers, search, options); err != nil {
return "", errors.Wrapf(err, "error building resolv.conf for container %s")
}
return result
return destPath, nil
}
// generateHosts creates a containers hosts file

1
vendor.conf
View File

@ -97,3 +97,4 @@ github.com/openshift/imagebuilder master
github.com/ulikunitz/xz v0.5.4
github.com/mailru/easyjson 03f2033d19d5860aef995fe360ac7d395cd8ce65
github.com/coreos/go-iptables 25d087f3cffd9aedc0c2b7eff25f23cbf3c20fe1
github.com/docker/libnetwork v0.7.2-rc.1

202
vendor/github.com/docker/libnetwork/LICENSE generated vendored Normal file
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@ -0,0 +1,202 @@
Apache License
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http://www.apache.org/licenses/
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89
vendor/github.com/docker/libnetwork/README.md generated vendored Normal file
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@ -0,0 +1,89 @@
# libnetwork - networking for containers
[![Circle CI](https://circleci.com/gh/docker/libnetwork/tree/master.svg?style=svg)](https://circleci.com/gh/docker/libnetwork/tree/master) [![Coverage Status](https://coveralls.io/repos/docker/libnetwork/badge.svg)](https://coveralls.io/r/docker/libnetwork) [![GoDoc](https://godoc.org/github.com/docker/libnetwork?status.svg)](https://godoc.org/github.com/docker/libnetwork)
Libnetwork provides a native Go implementation for connecting containers
The goal of libnetwork is to deliver a robust Container Network Model that provides a consistent programming interface and the required network abstractions for applications.
#### Design
Please refer to the [design](docs/design.md) for more information.
#### Using libnetwork
There are many networking solutions available to suit a broad range of use-cases. libnetwork uses a driver / plugin model to support all of these solutions while abstracting the complexity of the driver implementations by exposing a simple and consistent Network Model to users.
```go
func main() {
if reexec.Init() {
return
}
// Select and configure the network driver
networkType := "bridge"
// Create a new controller instance
driverOptions := options.Generic{}
genericOption := make(map[string]interface{})
genericOption[netlabel.GenericData] = driverOptions
controller, err := libnetwork.New(config.OptionDriverConfig(networkType, genericOption))
if err != nil {
log.Fatalf("libnetwork.New: %s", err)
}
// Create a network for containers to join.
// NewNetwork accepts Variadic optional arguments that libnetwork and Drivers can use.
network, err := controller.NewNetwork(networkType, "network1")
if err != nil {
log.Fatalf("controller.NewNetwork: %s", err)
}
// For each new container: allocate IP and interfaces. The returned network
// settings will be used for container infos (inspect and such), as well as
// iptables rules for port publishing. This info is contained or accessible
// from the returned endpoint.
ep, err := network.CreateEndpoint("Endpoint1")
if err != nil {
log.Fatalf("network.CreateEndpoint: %s", err)
}
// Create the sandbox for the container.
// NewSandbox accepts Variadic optional arguments which libnetwork can use.
sbx, err := controller.NewSandbox("container1",
libnetwork.OptionHostname("test"),
libnetwork.OptionDomainname("docker.io"))
if err != nil {
log.Fatalf("controller.NewSandbox: %s", err)
}
// A sandbox can join the endpoint via the join api.
err = ep.Join(sbx)
if err != nil {
log.Fatalf("ep.Join: %s", err)
}
// libnetwork client can check the endpoint's operational data via the Info() API
epInfo, err := ep.DriverInfo()
if err != nil {
log.Fatalf("ep.DriverInfo: %s", err)
}
macAddress, ok := epInfo[netlabel.MacAddress]
if !ok {
log.Fatalf("failed to get mac address from endpoint info")
}
fmt.Printf("Joined endpoint %s (%s) to sandbox %s (%s)\n", ep.Name(), macAddress, sbx.ContainerID(), sbx.Key())
}
```
## Future
Please refer to [roadmap](ROADMAP.md) for more information.
## Contributing
Want to hack on libnetwork? [Docker's contributions guidelines](https://github.com/docker/docker/blob/master/CONTRIBUTING.md) apply.
## Copyright and license
Code and documentation copyright 2015 Docker, inc. Code released under the Apache 2.0 license. Docs released under Creative commons.

201
vendor/github.com/docker/libnetwork/netutils/utils.go generated vendored Normal file
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@ -0,0 +1,201 @@
// Network utility functions.
package netutils
import (
"crypto/rand"
"encoding/hex"
"errors"
"fmt"
"io"
"net"
"strings"
"github.com/docker/libnetwork/types"
)
// constants for the IP address type
const (
IP = iota // IPv4 and IPv6
IPv4
IPv6
)
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 a alias format (name:alias)
func ParseAlias(val string) (string, string, error) {
if val == "" {
return "", "", fmt.Errorf("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
}

50
vendor/github.com/docker/libnetwork/netutils/utils_linux.go generated vendored Normal file
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@ -0,0 +1,50 @@
// +build linux
// Network utility functions.
package netutils
import (
"net"
"strings"
"github.com/docker/libnetwork/types"
"github.com/vishvananda/netlink"
)
var (
networkGetRoutesFct = netlink.RouteList
)
// CheckRouteOverlaps checks whether the passed network overlaps with any existing routes
func CheckRouteOverlaps(toCheck *net.IPNet) error {
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(prefix string, len int) (string, error) {
for i := 0; i < 3; i++ {
name, err := GenerateRandomName(prefix, len)
if err != nil {
continue
}
if _, err := netlink.LinkByName(name); err != nil {
if strings.Contains(err.Error(), "not found") {
return name, nil
}
return "", err
}
}
return "", types.InternalErrorf("could not generate interface name")
}

1
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Package resolvconf provides utility code to query and update DNS configuration in /etc/resolv.conf

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vendor/github.com/docker/libnetwork/resolvconf/dns/resolvconf.go generated vendored Normal file
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package dns
import (
"regexp"
)
// IPLocalhost is a regex patter for localhost IP address range.
const IPLocalhost = `((127\.([0-9]{1,3}\.){2}[0-9]{1,3})|(::1)$)`
var localhostIPRegexp = regexp.MustCompile(IPLocalhost)
// IsLocalhost returns true if ip matches the localhost IP regular expression.
// Used for determining if nameserver settings are being passed which are
// localhost addresses
func IsLocalhost(ip string) bool {
return localhostIPRegexp.MatchString(ip)
}

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vendor/github.com/docker/libnetwork/resolvconf/resolvconf.go generated vendored Normal file
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// Package resolvconf provides utility code to query and update DNS configuration in /etc/resolv.conf
package resolvconf
import (
"bytes"
"io/ioutil"
"regexp"
"strings"
"sync"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/libnetwork/netutils"
"github.com/docker/libnetwork/resolvconf/dns"
)
var (
// Note: the default IPv4 & IPv6 resolvers are set to Google's Public DNS
defaultIPv4Dns = []string{"nameserver 8.8.8.8", "nameserver 8.8.4.4"}
defaultIPv6Dns = []string{"nameserver 2001:4860:4860::8888", "nameserver 2001:4860:4860::8844"}
ipv4NumBlock = `(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)`
ipv4Address = `(` + ipv4NumBlock + `\.){3}` + ipv4NumBlock
// This is not an IPv6 address verifier as it will accept a super-set of IPv6, and also
// will *not match* IPv4-Embedded IPv6 Addresses (RFC6052), but that and other variants
// -- e.g. other link-local types -- either won't work in containers or are unnecessary.
// For readability and sufficiency for Docker purposes this seemed more reasonable than a
// 1000+ character regexp with exact and complete IPv6 validation
ipv6Address = `([0-9A-Fa-f]{0,4}:){2,7}([0-9A-Fa-f]{0,4})`
localhostNSRegexp = regexp.MustCompile(`(?m)^nameserver\s+` + dns.IPLocalhost + `\s*\n*`)
nsIPv6Regexp = regexp.MustCompile(`(?m)^nameserver\s+` + ipv6Address + `\s*\n*`)
nsRegexp = regexp.MustCompile(`^\s*nameserver\s*((` + ipv4Address + `)|(` + ipv6Address + `))\s*$`)
nsIPv6Regexpmatch = regexp.MustCompile(`^\s*nameserver\s*((` + ipv6Address + `))\s*$`)
nsIPv4Regexpmatch = regexp.MustCompile(`^\s*nameserver\s*((` + ipv4Address + `))\s*$`)
searchRegexp = regexp.MustCompile(`^\s*search\s*(([^\s]+\s*)*)$`)
optionsRegexp = regexp.MustCompile(`^\s*options\s*(([^\s]+\s*)*)$`)
)
var lastModified struct {
sync.Mutex
sha256 string
contents []byte
}
// File contains the resolv.conf content and its hash
type File struct {
Content []byte
Hash string
}
// Get returns the contents of /etc/resolv.conf and its hash
func Get() (*File, error) {
resolv, err := ioutil.ReadFile("/etc/resolv.conf")
if err != nil {
return nil, err
}
hash, err := ioutils.HashData(bytes.NewReader(resolv))
if err != nil {
return nil, err
}
return &File{Content: resolv, Hash: hash}, nil
}
// GetSpecific returns the contents of the user specified resolv.conf file and its hash
func GetSpecific(path string) (*File, error) {
resolv, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
hash, err := ioutils.HashData(bytes.NewReader(resolv))
if err != nil {
return nil, err
}
return &File{Content: resolv, Hash: hash}, nil
}
// GetIfChanged retrieves the host /etc/resolv.conf file, checks against the last hash
// and, if modified since last check, returns the bytes and new hash.
// This feature is used by the resolv.conf updater for containers
func GetIfChanged() (*File, error) {
lastModified.Lock()
defer lastModified.Unlock()
resolv, err := ioutil.ReadFile("/etc/resolv.conf")
if err != nil {
return nil, err
}
newHash, err := ioutils.HashData(bytes.NewReader(resolv))
if err != nil {
return nil, err
}
if lastModified.sha256 != newHash {
lastModified.sha256 = newHash
lastModified.contents = resolv
return &File{Content: resolv, Hash: newHash}, nil
}
// nothing changed, so return no data
return nil, nil
}
// GetLastModified retrieves the last used contents and hash of the host resolv.conf.
// Used by containers updating on restart
func GetLastModified() *File {
lastModified.Lock()
defer lastModified.Unlock()
return &File{Content: lastModified.contents, Hash: lastModified.sha256}
}
// FilterResolvDNS cleans up the config in resolvConf. It has two main jobs:
// 1. It looks for localhost (127.*|::1) entries in the provided
// resolv.conf, removing local nameserver entries, and, if the resulting
// cleaned config has no defined nameservers left, adds default DNS entries
// 2. Given the caller provides the enable/disable state of IPv6, the filter
// code will remove all IPv6 nameservers if it is not enabled for containers
//
func FilterResolvDNS(resolvConf []byte, ipv6Enabled bool) (*File, error) {
cleanedResolvConf := localhostNSRegexp.ReplaceAll(resolvConf, []byte{})
// if IPv6 is not enabled, also clean out any IPv6 address nameserver
if !ipv6Enabled {
cleanedResolvConf = nsIPv6Regexp.ReplaceAll(cleanedResolvConf, []byte{})
}
// if the resulting resolvConf has no more nameservers defined, add appropriate
// default DNS servers for IPv4 and (optionally) IPv6
if len(GetNameservers(cleanedResolvConf, netutils.IP)) == 0 {
logrus.Infof("No non-localhost DNS nameservers are left in resolv.conf. Using default external servers : %v", defaultIPv4Dns)
dns := defaultIPv4Dns
if ipv6Enabled {
logrus.Infof("IPv6 enabled; Adding default IPv6 external servers : %v", defaultIPv6Dns)
dns = append(dns, defaultIPv6Dns...)
}
cleanedResolvConf = append(cleanedResolvConf, []byte("\n"+strings.Join(dns, "\n"))...)
}
hash, err := ioutils.HashData(bytes.NewReader(cleanedResolvConf))
if err != nil {
return nil, err
}
return &File{Content: cleanedResolvConf, Hash: hash}, nil
}
// getLines parses input into lines and strips away comments.
func getLines(input []byte, commentMarker []byte) [][]byte {
lines := bytes.Split(input, []byte("\n"))
var output [][]byte
for _, currentLine := range lines {
var commentIndex = bytes.Index(currentLine, commentMarker)
if commentIndex == -1 {
output = append(output, currentLine)
} else {
output = append(output, currentLine[:commentIndex])
}
}
return output
}
// GetNameservers returns nameservers (if any) listed in /etc/resolv.conf
func GetNameservers(resolvConf []byte, kind int) []string {
nameservers := []string{}
for _, line := range getLines(resolvConf, []byte("#")) {
var ns [][]byte
if kind == netutils.IP {
ns = nsRegexp.FindSubmatch(line)
} else if kind == netutils.IPv4 {
ns = nsIPv4Regexpmatch.FindSubmatch(line)
} else if kind == netutils.IPv6 {
ns = nsIPv6Regexpmatch.FindSubmatch(line)
}
if len(ns) > 0 {
nameservers = append(nameservers, string(ns[1]))
}
}
return nameservers
}
// GetNameserversAsCIDR returns nameservers (if any) listed in
// /etc/resolv.conf as CIDR blocks (e.g., "1.2.3.4/32")
// This function's output is intended for net.ParseCIDR
func GetNameserversAsCIDR(resolvConf []byte) []string {
nameservers := []string{}
for _, nameserver := range GetNameservers(resolvConf, netutils.IP) {
nameservers = append(nameservers, nameserver+"/32")
}
return nameservers
}
// GetSearchDomains returns search domains (if any) listed in /etc/resolv.conf
// If more than one search line is encountered, only the contents of the last
// one is returned.
func GetSearchDomains(resolvConf []byte) []string {
domains := []string{}
for _, line := range getLines(resolvConf, []byte("#")) {
match := searchRegexp.FindSubmatch(line)
if match == nil {
continue
}
domains = strings.Fields(string(match[1]))
}
return domains
}
// GetOptions returns options (if any) listed in /etc/resolv.conf
// If more than one options line is encountered, only the contents of the last
// one is returned.
func GetOptions(resolvConf []byte) []string {
options := []string{}
for _, line := range getLines(resolvConf, []byte("#")) {
match := optionsRegexp.FindSubmatch(line)
if match == nil {
continue
}
options = strings.Fields(string(match[1]))
}
return options
}
// Build writes a configuration file to path containing a "nameserver" entry
// for every element in dns, a "search" entry for every element in
// dnsSearch, and an "options" entry for every element in dnsOptions.
func Build(path string, dns, dnsSearch, dnsOptions []string) (*File, error) {
content := bytes.NewBuffer(nil)
if len(dnsSearch) > 0 {
if searchString := strings.Join(dnsSearch, " "); strings.Trim(searchString, " ") != "." {
if _, err := content.WriteString("search " + searchString + "\n"); err != nil {
return nil, err
}
}
}
for _, dns := range dns {
if _, err := content.WriteString("nameserver " + dns + "\n"); err != nil {
return nil, err
}
}
if len(dnsOptions) > 0 {
if optsString := strings.Join(dnsOptions, " "); strings.Trim(optsString, " ") != "" {
if _, err := content.WriteString("options " + optsString + "\n"); err != nil {
return nil, err
}
}
}
hash, err := ioutils.HashData(bytes.NewReader(content.Bytes()))
if err != nil {
return nil, err
}
return &File{Content: content.Bytes(), Hash: hash}, ioutil.WriteFile(path, content.Bytes(), 0644)
}

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vendor/github.com/docker/libnetwork/types/types.go generated vendored Normal file
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// Package types contains types that are common across libnetwork project
package types
import (
"bytes"
"fmt"
"net"
"strconv"
"strings"
)
// UUID represents a globally unique ID of various resources like network and endpoint
type UUID string
// TransportPort represent a local Layer 4 endpoint
type TransportPort struct {
Proto Protocol
Port uint16
}
// Equal checks if this instance of Transportport is equal to the passed one
func (t *TransportPort) Equal(o *TransportPort) bool {
if t == o {
return true
}
if o == nil {
return false
}
if t.Proto != o.Proto || t.Port != o.Port {
return false
}
return true
}
// GetCopy returns a copy of this TransportPort structure instance
func (t *TransportPort) GetCopy() TransportPort {
return TransportPort{Proto: t.Proto, Port: t.Port}
}
// String returns the TransportPort structure in string form
func (t *TransportPort) String() string {
return fmt.Sprintf("%s/%d", t.Proto.String(), t.Port)
}
// FromString reads the TransportPort structure from string
func (t *TransportPort) FromString(s string) error {
ps := strings.Split(s, "/")
if len(ps) == 2 {
t.Proto = ParseProtocol(ps[0])
if p, err := strconv.ParseUint(ps[1], 10, 16); err == nil {
t.Port = uint16(p)
return nil
}
}
return BadRequestErrorf("invalid format for transport port: %s", s)
}
// PortBinding represent a port binding between the container and the host
type PortBinding struct {
Proto Protocol
IP net.IP
Port uint16
HostIP net.IP
HostPort uint16
HostPortEnd uint16
}
// HostAddr returns the host side transport address
func (p PortBinding) HostAddr() (net.Addr, error) {
switch p.Proto {
case UDP:
return &net.UDPAddr{IP: p.HostIP, Port: int(p.HostPort)}, nil
case TCP:
return &net.TCPAddr{IP: p.HostIP, Port: int(p.HostPort)}, nil
default:
return nil, ErrInvalidProtocolBinding(p.Proto.String())
}
}
// ContainerAddr returns the container side transport address
func (p PortBinding) ContainerAddr() (net.Addr, error) {
switch p.Proto {
case UDP:
return &net.UDPAddr{IP: p.IP, Port: int(p.Port)}, nil
case TCP:
return &net.TCPAddr{IP: p.IP, Port: int(p.Port)}, nil
default:
return nil, ErrInvalidProtocolBinding(p.Proto.String())
}
}
// GetCopy returns a copy of this PortBinding structure instance
func (p *PortBinding) GetCopy() PortBinding {
return PortBinding{
Proto: p.Proto,
IP: GetIPCopy(p.IP),
Port: p.Port,
HostIP: GetIPCopy(p.HostIP),
HostPort: p.HostPort,
HostPortEnd: p.HostPortEnd,
}
}
// String return the PortBinding structure in string form
func (p *PortBinding) String() string {
ret := fmt.Sprintf("%s/", p.Proto)
if p.IP != nil {
ret = fmt.Sprintf("%s%s", ret, p.IP.String())
}
ret = fmt.Sprintf("%s:%d/", ret, p.Port)
if p.HostIP != nil {
ret = fmt.Sprintf("%s%s", ret, p.HostIP.String())
}
ret = fmt.Sprintf("%s:%d", ret, p.HostPort)
return ret
}
// FromString reads the TransportPort structure from string
func (p *PortBinding) FromString(s string) error {
ps := strings.Split(s, "/")
if len(ps) != 3 {
return BadRequestErrorf("invalid format for port binding: %s", s)
}
p.Proto = ParseProtocol(ps[0])
var err error
if p.IP, p.Port, err = parseIPPort(ps[1]); err != nil {
return BadRequestErrorf("failed to parse Container IP/Port in port binding: %s", err.Error())
}
if p.HostIP, p.HostPort, err = parseIPPort(ps[2]); err != nil {
return BadRequestErrorf("failed to parse Host IP/Port in port binding: %s", err.Error())
}
return nil
}
func parseIPPort(s string) (net.IP, uint16, error) {
pp := strings.Split(s, ":")
if len(pp) != 2 {
return nil, 0, BadRequestErrorf("invalid format: %s", s)
}
var ip net.IP
if pp[0] != "" {
if ip = net.ParseIP(pp[0]); ip == nil {
return nil, 0, BadRequestErrorf("invalid ip: %s", pp[0])
}
}
port, err := strconv.ParseUint(pp[1], 10, 16)
if err != nil {
return nil, 0, BadRequestErrorf("invalid port: %s", pp[1])
}
return ip, uint16(port), nil
}
// Equal checks if this instance of PortBinding is equal to the passed one
func (p *PortBinding) Equal(o *PortBinding) bool {
if p == o {
return true
}
if o == nil {
return false
}
if p.Proto != o.Proto || p.Port != o.Port ||
p.HostPort != o.HostPort || p.HostPortEnd != o.HostPortEnd {
return false
}
if p.IP != nil {
if !p.IP.Equal(o.IP) {
return false
}
} else {
if o.IP != nil {
return false
}
}
if p.HostIP != nil {
if !p.HostIP.Equal(o.HostIP) {
return false
}
} else {
if o.HostIP != nil {
return false
}
}
return true
}
// ErrInvalidProtocolBinding is returned when the port binding protocol is not valid.
type ErrInvalidProtocolBinding string
func (ipb ErrInvalidProtocolBinding) Error() string {
return fmt.Sprintf("invalid transport protocol: %s", string(ipb))
}
const (
// ICMP is for the ICMP ip protocol
ICMP = 1
// TCP is for the TCP ip protocol
TCP = 6
// UDP is for the UDP ip protocol
UDP = 17
)
// Protocol represents a IP protocol number
type Protocol uint8
func (p Protocol) String() string {
switch p {
case ICMP:
return "icmp"
case TCP:
return "tcp"
case UDP:
return "udp"
default:
return fmt.Sprintf("%d", p)
}
}
// ParseProtocol returns the respective Protocol type for the passed string
func ParseProtocol(s string) Protocol {
switch strings.ToLower(s) {
case "icmp":
return ICMP
case "udp":
return UDP
case "tcp":
return TCP
default:
return 0
}
}
// GetMacCopy returns a copy of the passed MAC address
func GetMacCopy(from net.HardwareAddr) net.HardwareAddr {
if from == nil {
return nil
}
to := make(net.HardwareAddr, len(from))
copy(to, from)
return to
}
// GetIPCopy returns a copy of the passed IP address
func GetIPCopy(from net.IP) net.IP {
if from == nil {
return nil
}
to := make(net.IP, len(from))
copy(to, from)
return to
}
// GetIPNetCopy returns a copy of the passed IP Network
func GetIPNetCopy(from *net.IPNet) *net.IPNet {
if from == nil {
return nil
}
bm := make(net.IPMask, len(from.Mask))
copy(bm, from.Mask)
return &net.IPNet{IP: GetIPCopy(from.IP), Mask: bm}
}
// GetIPNetCanonical returns the canonical form for the passed network
func GetIPNetCanonical(nw *net.IPNet) *net.IPNet {
if nw == nil {
return nil
}
c := GetIPNetCopy(nw)
c.IP = c.IP.Mask(nw.Mask)
return c
}
// CompareIPNet returns equal if the two IP Networks are equal
func CompareIPNet(a, b *net.IPNet) bool {
if a == b {
return true
}
if a == nil || b == nil {
return false
}
return a.IP.Equal(b.IP) && bytes.Equal(a.Mask, b.Mask)
}
// GetMinimalIP returns the address in its shortest form
func GetMinimalIP(ip net.IP) net.IP {
if ip != nil && ip.To4() != nil {
return ip.To4()
}
return ip
}
// GetMinimalIPNet returns a copy of the passed IP Network with congruent ip and mask notation
func GetMinimalIPNet(nw *net.IPNet) *net.IPNet {
if nw == nil {
return nil
}
if len(nw.IP) == 16 && nw.IP.To4() != nil {
m := nw.Mask
if len(m) == 16 {
m = m[12:16]
}
return &net.IPNet{IP: nw.IP.To4(), Mask: m}
}
return nw
}
var v4inV6MaskPrefix = []byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
// compareIPMask checks if the passed ip and mask are semantically compatible.
// It returns the byte indexes for the address and mask so that caller can
// do bitwise operations without modifying address representation.
func compareIPMask(ip net.IP, mask net.IPMask) (is int, ms int, err error) {
// Find the effective starting of address and mask
if len(ip) == net.IPv6len && ip.To4() != nil {
is = 12
}
if len(ip[is:]) == net.IPv4len && len(mask) == net.IPv6len && bytes.Equal(mask[:12], v4inV6MaskPrefix) {
ms = 12
}
// Check if address and mask are semantically compatible
if len(ip[is:]) != len(mask[ms:]) {
err = fmt.Errorf("ip and mask are not compatible: (%#v, %#v)", ip, mask)
}
return
}
// GetHostPartIP returns the host portion of the ip address identified by the mask.
// IP address representation is not modified. If address and mask are not compatible
// an error is returned.
func GetHostPartIP(ip net.IP, mask net.IPMask) (net.IP, error) {
// Find the effective starting of address and mask
is, ms, err := compareIPMask(ip, mask)
if err != nil {
return nil, fmt.Errorf("cannot compute host portion ip address because %s", err)
}
// Compute host portion
out := GetIPCopy(ip)
for i := 0; i < len(mask[ms:]); i++ {
out[is+i] &= ^mask[ms+i]
}
return out, nil
}
// GetBroadcastIP returns the broadcast ip address for the passed network (ip and mask).
// IP address representation is not modified. If address and mask are not compatible
// an error is returned.
func GetBroadcastIP(ip net.IP, mask net.IPMask) (net.IP, error) {
// Find the effective starting of address and mask
is, ms, err := compareIPMask(ip, mask)
if err != nil {
return nil, fmt.Errorf("cannot compute broadcast ip address because %s", err)
}
// Compute broadcast address
out := GetIPCopy(ip)
for i := 0; i < len(mask[ms:]); i++ {
out[is+i] |= ^mask[ms+i]
}
return out, nil
}
// ParseCIDR returns the *net.IPNet represented by the passed CIDR notation
func ParseCIDR(cidr string) (n *net.IPNet, e error) {
var i net.IP
if i, n, e = net.ParseCIDR(cidr); e == nil {
n.IP = i
}
return
}
const (
// NEXTHOP indicates a StaticRoute with an IP next hop.
NEXTHOP = iota
// CONNECTED indicates a StaticRoute with an interface for directly connected peers.
CONNECTED
)
// StaticRoute is a statically-provisioned IP route.
type StaticRoute struct {
Destination *net.IPNet
RouteType int // NEXT_HOP or CONNECTED
// NextHop will be resolved by the kernel (i.e. as a loose hop).
NextHop net.IP
}
// GetCopy returns a copy of this StaticRoute structure
func (r *StaticRoute) GetCopy() *StaticRoute {
d := GetIPNetCopy(r.Destination)
nh := GetIPCopy(r.NextHop)
return &StaticRoute{Destination: d,
RouteType: r.RouteType,
NextHop: nh,
}
}
// InterfaceStatistics represents the interface's statistics
type InterfaceStatistics struct {
RxBytes uint64
RxPackets uint64
RxErrors uint64
RxDropped uint64
TxBytes uint64
TxPackets uint64
TxErrors uint64
TxDropped uint64
}
func (is *InterfaceStatistics) String() string {
return fmt.Sprintf("\nRxBytes: %d, RxPackets: %d, RxErrors: %d, RxDropped: %d, TxBytes: %d, TxPackets: %d, TxErrors: %d, TxDropped: %d",
is.RxBytes, is.RxPackets, is.RxErrors, is.RxDropped, is.TxBytes, is.TxPackets, is.TxErrors, is.TxDropped)
}
/******************************
* Well-known Error Interfaces
******************************/
// MaskableError is an interface for errors which can be ignored by caller
type MaskableError interface {
// Maskable makes implementer into MaskableError type
Maskable()
}
// RetryError is an interface for errors which might get resolved through retry
type RetryError interface {
// Retry makes implementer into RetryError type
Retry()
}
// BadRequestError is an interface for errors originated by a bad request
type BadRequestError interface {
// BadRequest makes implementer into BadRequestError type
BadRequest()
}
// NotFoundError is an interface for errors raised because a needed resource is not available
type NotFoundError interface {
// NotFound makes implementer into NotFoundError type
NotFound()
}
// ForbiddenError is an interface for errors which denote a valid request that cannot be honored
type ForbiddenError interface {
// Forbidden makes implementer into ForbiddenError type
Forbidden()
}
// NoServiceError is an interface for errors returned when the required service is not available
type NoServiceError interface {
// NoService makes implementer into NoServiceError type
NoService()
}
// TimeoutError is an interface for errors raised because of timeout
type TimeoutError interface {
// Timeout makes implementer into TimeoutError type
Timeout()
}
// NotImplementedError is an interface for errors raised because of requested functionality is not yet implemented
type NotImplementedError interface {
// NotImplemented makes implementer into NotImplementedError type
NotImplemented()
}
// InternalError is an interface for errors raised because of an internal error
type InternalError interface {
// Internal makes implementer into InternalError type
Internal()
}
/******************************
* Well-known Error Formatters
******************************/
// BadRequestErrorf creates an instance of BadRequestError
func BadRequestErrorf(format string, params ...interface{}) error {
return badRequest(fmt.Sprintf(format, params...))
}
// NotFoundErrorf creates an instance of NotFoundError
func NotFoundErrorf(format string, params ...interface{}) error {
return notFound(fmt.Sprintf(format, params...))
}
// ForbiddenErrorf creates an instance of ForbiddenError
func ForbiddenErrorf(format string, params ...interface{}) error {
return forbidden(fmt.Sprintf(format, params...))
}
// NoServiceErrorf creates an instance of NoServiceError
func NoServiceErrorf(format string, params ...interface{}) error {
return noService(fmt.Sprintf(format, params...))
}
// NotImplementedErrorf creates an instance of NotImplementedError
func NotImplementedErrorf(format string, params ...interface{}) error {
return notImpl(fmt.Sprintf(format, params...))
}
// TimeoutErrorf creates an instance of TimeoutError
func TimeoutErrorf(format string, params ...interface{}) error {
return timeout(fmt.Sprintf(format, params...))
}
// InternalErrorf creates an instance of InternalError
func InternalErrorf(format string, params ...interface{}) error {
return internal(fmt.Sprintf(format, params...))
}
// InternalMaskableErrorf creates an instance of InternalError and MaskableError
func InternalMaskableErrorf(format string, params ...interface{}) error {
return maskInternal(fmt.Sprintf(format, params...))
}
// RetryErrorf creates an instance of RetryError
func RetryErrorf(format string, params ...interface{}) error {
return retry(fmt.Sprintf(format, params...))
}
/***********************
* Internal Error Types
***********************/
type badRequest string
func (br badRequest) Error() string {
return string(br)
}
func (br badRequest) BadRequest() {}
type maskBadRequest string
type notFound string
func (nf notFound) Error() string {
return string(nf)
}
func (nf notFound) NotFound() {}
type forbidden string
func (frb forbidden) Error() string {
return string(frb)
}
func (frb forbidden) Forbidden() {}
type noService string
func (ns noService) Error() string {
return string(ns)
}
func (ns noService) NoService() {}
type maskNoService string
type timeout string
func (to timeout) Error() string {
return string(to)
}
func (to timeout) Timeout() {}
type notImpl string
func (ni notImpl) Error() string {
return string(ni)
}
func (ni notImpl) NotImplemented() {}
type internal string
func (nt internal) Error() string {
return string(nt)
}
func (nt internal) Internal() {}
type maskInternal string
func (mnt maskInternal) Error() string {
return string(mnt)
}
func (mnt maskInternal) Internal() {}
func (mnt maskInternal) Maskable() {}
type retry string
func (r retry) Error() string {
return string(r)
}
func (r retry) Retry() {}