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// SPDX-License-Identifier: GPL-3.0-or-later
package dnsmasq_dhcp
import (
"bufio"
"io"
"math"
"math/big"
"net"
"os"
"strings"
"time"
"github.com/netdata/netdata/go/go.d.plugin/pkg/iprange"
)
func (d *DnsmasqDHCP) collect() (map[string]int64, error) {
now := time.Now()
var updated bool
if now.Sub(d.parseConfigTime) > d.parseConfigEvery {
d.parseConfigTime = now
dhcpRanges, dhcpHosts := d.parseDnsmasqDHCPConfiguration()
d.dhcpRanges, d.dhcpHosts = dhcpRanges, dhcpHosts
updated = d.updateCharts()
d.collectV4V6Stats()
}
f, err := os.Open(d.LeasesPath)
if err != nil {
return nil, err
}
defer func() { _ = f.Close() }()
if !updated {
fi, err := f.Stat()
if err != nil {
return nil, err
}
if d.leasesModTime.Equal(fi.ModTime()) {
d.Debug("lease database file modification time has not changed, old data is returned")
return d.mx, nil
}
d.Debug("leases db file modification time has changed, reading it")
d.leasesModTime = fi.ModTime()
}
leases := findLeases(f)
d.collectRangesStats(leases)
return d.mx, nil
}
func (d *DnsmasqDHCP) collectV4V6Stats() {
d.mx["ipv4_dhcp_ranges"], d.mx["ipv6_dhcp_ranges"] = 0, 0
for _, r := range d.dhcpRanges {
if r.Family() == iprange.V6Family {
d.mx["ipv6_dhcp_ranges"]++
} else {
d.mx["ipv4_dhcp_ranges"]++
}
}
d.mx["ipv4_dhcp_hosts"], d.mx["ipv6_dhcp_hosts"] = 0, 0
for _, ip := range d.dhcpHosts {
if ip.To4() == nil {
d.mx["ipv6_dhcp_hosts"]++
} else {
d.mx["ipv4_dhcp_hosts"]++
}
}
}
func (d *DnsmasqDHCP) collectRangesStats(leases []net.IP) {
for _, r := range d.dhcpRanges {
d.mx["dhcp_range_"+r.String()+"_allocated_leases"] = 0
d.mx["dhcp_range_"+r.String()+"_utilization"] = 0
}
for _, ip := range leases {
for _, r := range d.dhcpRanges {
if r.Contains(ip) {
d.mx["dhcp_range_"+r.String()+"_allocated_leases"]++
break
}
}
}
for _, ip := range d.dhcpHosts {
for _, r := range d.dhcpRanges {
if r.Contains(ip) {
d.mx["dhcp_range_"+r.String()+"_allocated_leases"]++
break
}
}
}
for _, r := range d.dhcpRanges {
name := "dhcp_range_" + r.String() + "_allocated_leases"
numOfIps, ok := d.mx[name]
if !ok {
d.mx[name] = 0
}
d.mx["dhcp_range_"+r.String()+"_utilization"] = int64(math.Round(calcPercent(numOfIps, r.Size())))
}
}
func (d *DnsmasqDHCP) updateCharts() bool {
var updated bool
seen := make(map[string]bool)
for _, r := range d.dhcpRanges {
seen[r.String()] = true
if !d.cacheDHCPRanges[r.String()] {
d.cacheDHCPRanges[r.String()] = true
d.addDHCPRangeCharts(r.String())
updated = true
}
}
for v := range d.cacheDHCPRanges {
if !seen[v] {
delete(d.cacheDHCPRanges, v)
d.removeDHCPRangeCharts(v)
updated = true
}
}
return updated
}
func findLeases(r io.Reader) []net.IP {
/*
1560300536 08:00:27:61:3c:ee 2.2.2.3 debian8 *
duid 00:01:00:01:24:90:cf:5b:08:00:27:61:2e:2c
1560300414 660684014 1234::20b * 00:01:00:01:24:90:cf:a3:08:00:27:61:3c:ee
*/
var ips []net.IP
s := bufio.NewScanner(r)
for s.Scan() {
parts := strings.Fields(s.Text())
if len(parts) != 5 {
continue
}
ip := net.ParseIP(parts[2])
if ip == nil {
continue
}
ips = append(ips, ip)
}
return ips
}
func calcPercent(ips int64, hosts *big.Int) float64 {
h := hosts.Int64()
if ips == 0 || h == 0 || !hosts.IsInt64() {
return 0
}
return float64(ips) * 100 / float64(h)
}
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