49 lines
1.2 KiB
Go
49 lines
1.2 KiB
Go
package dhcp
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import (
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"fmt"
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"net"
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"os"
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"path/filepath"
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"strings"
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)
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func GenerateConfig(c Config) (string, map[string]string, error) {
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mask := fmt.Sprintf("%d.%d.%d.%d", c.Network.Mask[0], c.Network.Mask[1], c.Network.Mask[2], c.Network.Mask[3])
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var sb strings.Builder
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fmt.Fprintf(&sb, "no-resolv\n")
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fmt.Fprintf(&sb, "dhcp-range=%s,static,%s,12h\n", c.Network.IP.String(), mask)
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fmt.Fprintf(&sb, "dhcp-option=3,%s\n", c.Gateway.String())
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fmt.Fprintf(&sb, "dhcp-option=6,1.1.1.1,8.8.8.8\n\n")
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entries := make(map[string]string)
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i := 0
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for ip := cloneIP(c.Network.IP); c.Network.Contains(ip); incrementIP(ip) {
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mac := fmt.Sprintf("00:22:33:%02X:%02X:%02X", (i>>16)&0xFF, (i>>8)&0xFF, i&0xFF)
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fmt.Fprintf(&sb, "dhcp-host=%s,%s\n", mac, ip)
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entries[ip.String()] = mac
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i++
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}
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outPath := filepath.Join(c.ConfDir, c.Name+".conf")
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if err := os.MkdirAll(c.ConfDir, 0755); err != nil {
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return "", nil, err
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}
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return outPath, entries, os.WriteFile(outPath, []byte(sb.String()), 0644)
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}
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func incrementIP(ip net.IP) {
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for j := len(ip) - 1; j >= 0; j-- {
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ip[j]++
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if ip[j] != 0 {
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break
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}
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}
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}
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func cloneIP(ip net.IP) net.IP {
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clone := make(net.IP, len(ip))
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copy(clone, ip)
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return clone
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}
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