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2 Commits
71982f328f ... f43b8c64f4

Author SHA1 Message Date
Francesco Cheinasso f43b8c64f4
Merge ae1b9c8df1 into ef45dd3322 2024-01-11 10:57:30 +00:00
Francesco Cheinasso ae1b9c8df1 fix 2024-01-11 11:57:24 +01:00
1 changed files with 0 additions and 6 deletions
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util.go
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@ -60,13 +60,7 @@ func GetFirstAndLastIPFromCIDR(cidr string) (firstIP, lastIP net.IP, err error)
case net.IPv4len:
mask := binary.BigEndian.Uint32(subnet.Mask)
ip := binary.BigEndian.Uint32(subnet.IP)
// To achieve the first IP address, we need to AND the IP with the mask.
// The AND operation will set all bits in the host part to 0.
binary.BigEndian.PutUint32(firstIP, ip&mask)
// To achieve the last IP address, we need to OR the IP network with the inverted mask.
// The AND between the IP and the mask will set all bits in the host part to 0, keeping the network part.
// The XOR between the mask and 0xffffffff will set all bits in the host part to 1, and the network part to 0.
// The OR operation will keep the host part unchanged, and sets the host part to all 1.
binary.BigEndian.PutUint32(lastIP, (ip&mask)|(mask^0xffffffff))
case net.IPv6len:
mask1 := binary.BigEndian.Uint64(subnet.Mask[:8])