98 lines
2.7 KiB
Go
98 lines
2.7 KiB
Go
package opts
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import (
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"fmt"
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"net"
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"os"
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"runtime"
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"strings"
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fopts "github.com/docker/docker/opts"
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)
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// ValidateAttach validates that the specified string is a valid attach option.
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func ValidateAttach(val string) (string, error) {
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s := strings.ToLower(val)
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for _, str := range []string{"stdin", "stdout", "stderr"} {
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if s == str {
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return s, nil
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}
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}
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return val, fmt.Errorf("valid streams are STDIN, STDOUT and STDERR")
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}
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// ValidateEnv validates an environment variable and returns it.
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// If no value is specified, it returns the current value using os.Getenv.
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//
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// As on ParseEnvFile and related to #16585, environment variable names
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// are not validate what so ever, it's up to application inside docker
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// to validate them or not.
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//
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// The only validation here is to check if name is empty, per #25099
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func ValidateEnv(val string) (string, error) {
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arr := strings.Split(val, "=")
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if arr[0] == "" {
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return "", fmt.Errorf("invalid environment variable: %s", val)
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}
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if len(arr) > 1 {
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return val, nil
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}
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if !doesEnvExist(val) {
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return val, nil
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}
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return fmt.Sprintf("%s=%s", val, os.Getenv(val)), nil
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}
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func doesEnvExist(name string) bool {
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for _, entry := range os.Environ() {
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parts := strings.SplitN(entry, "=", 2)
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if runtime.GOOS == "windows" {
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// Environment variable are case-insensitive on Windows. PaTh, path and PATH are equivalent.
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if strings.EqualFold(parts[0], name) {
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return true
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}
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}
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if parts[0] == name {
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return true
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}
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}
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return false
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}
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// ValidateArg validates a build-arg variable and returns it.
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// Build-arg is in the form of <varname>=<value> where <varname> is required.
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func ValidateArg(val string) (string, error) {
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arr := strings.Split(val, "=")
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if len(arr) > 1 && isNotEmpty(arr[0]) {
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return val, nil
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}
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return "", fmt.Errorf("bad format for build-arg: %s", val)
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}
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func isNotEmpty(val string) bool {
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return len(val) > 0
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}
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// ValidateExtraHost validates that the specified string is a valid extrahost and returns it.
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// ExtraHost is in the form of name:ip where the ip has to be a valid ip (IPv4 or IPv6).
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func ValidateExtraHost(val string) (string, error) {
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// allow for IPv6 addresses in extra hosts by only splitting on first ":"
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arr := strings.SplitN(val, ":", 2)
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if len(arr) != 2 || len(arr[0]) == 0 {
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return "", fmt.Errorf("bad format for add-host: %q", val)
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}
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if _, err := fopts.ValidateIPAddress(arr[1]); err != nil {
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return "", fmt.Errorf("invalid IP address in add-host: %q", arr[1])
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}
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return val, nil
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}
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// ValidateMACAddress validates a MAC address.
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func ValidateMACAddress(val string) (string, error) {
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_, err := net.ParseMAC(strings.TrimSpace(val))
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if err != nil {
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return "", err
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}
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return val, nil
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}
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