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address_pool.go
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address_pool.go
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package main
import (
"net"
"sync"
)
type AddressPool struct {
pool map[string]bool
bindips map[string]string
rbindips map[string]string
mutex *sync.Mutex
gw string
network *net.IPNet
}
func NewAddressPool(cidr string, bindips map[string]string) (*AddressPool, error) {
rbindips := make(map[string]string)
for user, ip := range bindips {
rbindips[ip] = user
}
_, network, err := net.ParseCIDR(cidr)
if err != nil {
return nil, err
}
networkipv4 := network.IP.To4()
start := net.IPv4(networkipv4[0], networkipv4[1], networkipv4[2], networkipv4[3]).To4()
var gw string
pool := make(map[string]bool)
n, c := network.Mask.Size()
a := 1 << (c - n)
for i := 1; i < a-1; i++ {
if i%256 == 0 {
start[2] += 1
}
if i%65536 == 0 {
start[1] += 1
}
start[3] += 1
if start[3] == 0 {
continue
}
if i == 1 {
gw = start.String()
continue
}
_, ok := rbindips[start.String()]
if ok {
pool[start.String()] = true
} else {
pool[start.String()] = false
}
}
return &AddressPool{pool: pool, mutex: &sync.Mutex{}, gw: gw, network: network, bindips: bindips, rbindips: rbindips}, nil
}
func (ap *AddressPool) Alloc() string {
for ip, used := range ap.pool {
if !used {
ap.pool[ip] = true
return ip
}
}
return ""
}
func (ap *AddressPool) SetAllocIP(ip string) {
ap.pool[ip] = true
}
func (ap *AddressPool) GatewayIP() string {
return ap.gw
}
func (ap *AddressPool) GetNetwork() string {
return ap.network.String()
}
func (ap *AddressPool) Release(ip string) {
_, ok := ap.pool[ip]
if ok {
ap.pool[ip] = false
}
}
func (ap *AddressPool) GetBindIP(user string) string {
return ap.bindips[user]
}
func (ap *AddressPool) GetBindUser(ip string) string {
return ap.rbindips[ip]
}
func (ap *AddressPool) IsAlloc(ip string) bool {
v, ok := ap.pool[ip]
if ok {
return v
}
return ok
}