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fix occasional panic on registration

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GenerateRandomStringDNSSafe will panic occasionally if the random base64
string contains too many - and _ due to the replacement. Fix by looping.
This commit is contained in:
Anton Schubert 2022-06-14 11:33:01 +02:00
parent d2d1f92836
commit 8f31ed51e1
2 changed files with 25 additions and 7 deletions
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14
utils.go
View File

@ -325,11 +325,17 @@ func GenerateRandomStringURLSafe(n int) (string, error) {
// number generator fails to function correctly, in which
// case the caller should not continue.
func GenerateRandomStringDNSSafe(n int) (string, error) {
str, err := GenerateRandomStringURLSafe(n)
var str string
var err error
for len(str) < n {
str, err = GenerateRandomStringURLSafe(n)
if err != nil {
return "", err
}
str = strings.ToLower(strings.ReplaceAll(strings.ReplaceAll(str, "_", ""), "-", ""))
}
str = strings.ToLower(strings.ReplaceAll(strings.ReplaceAll(str, "_", ""), "-", ""))
return str[:n], err
return str[:n], nil
}
func IsStringInSlice(slice []string, str string) bool {

18
utils_test.go
View File

@ -34,7 +34,7 @@ func (s *Suite) TestGetUsedIps(c *check.C) {
MachineKey: "foo",
NodeKey: "bar",
DiscoKey: "faa",
Hostname: "testmachine",
Hostname: "testmachine",
NamespaceID: namespace.ID,
RegisterMethod: RegisterMethodAuthKey,
AuthKeyID: uint(pak.ID),
@ -82,7 +82,7 @@ func (s *Suite) TestGetMultiIp(c *check.C) {
MachineKey: "foo",
NodeKey: "bar",
DiscoKey: "faa",
Hostname: "testmachine",
Hostname: "testmachine",
NamespaceID: namespace.ID,
RegisterMethod: RegisterMethodAuthKey,
AuthKeyID: uint(pak.ID),
@ -172,7 +172,7 @@ func (s *Suite) TestGetAvailableIpMachineWithoutIP(c *check.C) {
MachineKey: "foo",
NodeKey: "bar",
DiscoKey: "faa",
Hostname: "testmachine",
Hostname: "testmachine",
NamespaceID: namespace.ID,
RegisterMethod: RegisterMethodAuthKey,
AuthKeyID: uint(pak.ID),
@ -185,3 +185,15 @@ func (s *Suite) TestGetAvailableIpMachineWithoutIP(c *check.C) {
c.Assert(len(ips2), check.Equals, 1)
c.Assert(ips2[0].String(), check.Equals, expected.String())
}
func (s *Suite) TestGenerateRandomStringDNSSafe(c *check.C) {
for i := 0; i < 100000; i++ {
str, err := GenerateRandomStringDNSSafe(8)
if err != nil {
c.Error(err)
}
if len(str) != 8 {
c.Error("invalid length", len(str), str)
}
}
}