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Ensure --hostname is valid

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Validates whether the given hostname is RFC 1123
(https://tools.ietf.org/html/rfc1123) compliant.

Fixes #20371

Signed-off-by: Andrew Guenther <guenther.andrew.j@gmail.com>
This commit is contained in:
Andrew Guenther 2016-02-21 15:08:58 -08:00
parent 675617bc85
commit 3b6ffc8022
2 changed files with 30 additions and 3 deletions
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8
runconfig/opts/parse.go
View file

@ -6,6 +6,7 @@ import (
"fmt"
"io/ioutil"
"path"
"regexp"
"strconv"
"strings"
@ -248,6 +249,13 @@ func Parse(cmd *flag.FlagSet, args []string) (*container.Config, *container.Host
hostname = parts[0]
domainname = parts[1]
}
// Validate if the given hostname is RFC 1123 (https://tools.ietf.org/html/rfc1123) compliant.
if hostname != "" {
matched, _ := regexp.MatchString("^(([[:alnum:]]|[[:alnum:]][[:alnum:]\\-]*[[:alnum:]])\\.)*([[:alnum:]]|[[:alnum:]][[:alnum:]\\-]*[[:alnum:]])$", hostname)
if !matched {
return nil, nil, nil, cmd, fmt.Errorf("invalid hostname format for --hostname: %s", hostname)
}
}
ports, portBindings, err := nat.ParsePortSpecs(flPublish.GetAll())
if err != nil {

23
runconfig/opts/parse_test.go
View file

@ -385,12 +385,31 @@ func TestParseWithMemorySwap(t *testing.T) {
}
func TestParseHostname(t *testing.T) {
hostname := "--hostname=hostname"
validHostnames := map[string]string{
"hostname": "hostname",
"host-name": "host-name",
"hostname123": "hostname123",
"123hostname": "123hostname",
}
invalidHostnames := map[string]string{
"^hostname": "invalid hostname format for --hostname: ^hostname",
"hostname%": "invalid hostname format for --hostname: hostname%",
"host&name": "invalid hostname format for --hostname: host&name",
"-hostname": "invalid hostname format for --hostname: -hostname",
"host_name": "invalid hostname format for --hostname: host_name",
}
hostnameWithDomain := "--hostname=hostname.domainname"
hostnameWithDomainTld := "--hostname=hostname.domainname.tld"
if config, _ := mustParse(t, hostname); config.Hostname != "hostname" && config.Domainname != "" {
for hostname, expectedHostname := range validHostnames {
if config, _ := mustParse(t, fmt.Sprintf("--hostname=%s", hostname)); config.Hostname != expectedHostname {
t.Fatalf("Expected the config to have 'hostname' as hostname, got '%v'", config.Hostname)
}
}
for hostname, expectedError := range invalidHostnames {
if _, _, err := parse(t, fmt.Sprintf("--hostname=%s", hostname)); err == nil || err.Error() != expectedError {
t.Fatalf("Expected error '%v' with '--hostname=%s', got '%s'", expectedError, hostname, err)
}
}
if config, _ := mustParse(t, hostnameWithDomain); config.Hostname != "hostname" && config.Domainname != "domainname" {
t.Fatalf("Expected the config to have 'hostname' as hostname, got '%v'", config.Hostname)
}