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Change cidrhost() to get IP from end of the range when negative number given

Browse Source 
Ref: https://github.com/apparentlymart/go-cidr/pull/2
This commit is contained in:
tmshn 2017-04-19 20:26:49 +09:00 committed by Martin Atkins
parent 4a782583b6
commit 86d7c47c0a
4 changed files with 30 additions and 5 deletions
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15
config/interpolate_funcs_test.go
View File

@ -541,11 +541,26 @@ func TestInterpolateFuncCidrHost(t *testing.T) {
"192.168.1.5",
false,
},
{
`${cidrhost("192.168.1.0/24", -5)}`,
"192.168.1.251",
false,
},
{
`${cidrhost("192.168.1.0/24", -256)}`,
"192.168.1.0",
false,
},
{
`${cidrhost("192.168.1.0/30", 255)}`,
nil,
true, // 255 doesn't fit in two bits
},
{
`${cidrhost("192.168.1.0/30", -255)}`,
nil,
true, // 255 doesn't fit in two bits
},
{
`${cidrhost("not-a-cidr", 6)}`,
nil,

9
vendor/github.com/apparentlymart/go-cidr/cidr/cidr.go generated vendored
View File

@ -61,7 +61,14 @@ func Host(base *net.IPNet, num int) (net.IP, error) {
hostLen := addrLen - parentLen
maxHostNum := uint64(1<<uint64(hostLen)) - 1
if uint64(num) > maxHostNum {
numUint64 := uint64(num)
if num < 0 {
numUint64 = uint64(-num) - 1
num = int(maxHostNum - numUint64)
}
if numUint64 > maxHostNum {
return nil, fmt.Errorf("prefix of %d does not accommodate a host numbered %d", parentLen, num)
}

5
vendor/vendor.json vendored
View File

@ -446,9 +446,10 @@
"revisionTime": "2016-08-22T23:00:20Z"
},
{
"checksumSHA1": "kn+zdUr5TNsoAX8BgjOaWYtMT5U=",
"checksumSHA1": "FIL83loX9V9APvGQIjJpbxq53F0=",
"path": "github.com/apparentlymart/go-cidr/cidr",
"revision": "a3ebdb999b831ecb6ab8a226e31b07b2b9061c47"
"revision": "7e4b007599d4e2076d9a81be723b3912852dda2c",
"revisionTime": "2017-04-18T07:21:50Z"
},
{
"checksumSHA1": "yicZ9OtLcy3iCgraWO015yeoO5E=",

6
website/source/docs/configuration/interpolation.html.md
View File

@ -157,8 +157,10 @@ The supported built-in functions are:
* `chomp(string)` - Removes trailing newlines from the given string.
* `cidrhost(iprange, hostnum)` - Takes an IP address range in CIDR notation
and creates an IP address with the given host number. For example,
`cidrhost("10.0.0.0/8", 2)` returns `10.0.0.2`.
and creates an IP address with the given host number. If given host
number is negative, the count starts from the end of the range.
For example, `cidrhost("10.0.0.0/8", 2)` returns `10.0.0.2` and
`cidrhost("10.0.0.0/8", -2)` returns `10.255.255.254`.
* `cidrnetmask(iprange)` - Takes an IP address range in CIDR notation
and returns the address-formatted subnet mask format that some