package main import ( "errors" "fmt" "github.com/vishvananda/netlink" "net" "os" "strconv" "time" "kvas2-go/models" "kvas2-go/pkg/ip-helper" ) type GroupOptions struct { Enabled bool FWMark uint32 Table int } type Group struct { *models.Group ipsetName string options GroupOptions } func (g *Group) HandleIPv4(names []string, address net.IP, ttl time.Duration) error { if !g.options.Enabled { return nil } ttlSeconds := uint32(ttl.Seconds()) DomainSearch: for _, domain := range g.Domains { if !domain.IsEnabled() { continue } for _, name := range names { if domain.IsMatch(name) { err := netlink.IpsetAdd(g.ipsetName, &netlink.IPSetEntry{ IP: address, Timeout: &ttlSeconds, Replace: true, }) if err != nil { return fmt.Errorf("failed to assign address: %w", err) } break DomainSearch } } } return nil } func (g *Group) Enable() error { if g.options.Enabled { return nil } fwmark, err := ipHelper.GetUnusedFwMark(1) if err != nil { return fmt.Errorf("error while getting free fwmark: %w", err) } table, err := ipHelper.GetUnusedTable(1) if err != nil { return fmt.Errorf("error while getting free table: %w", err) } fwmarkStr := strconv.Itoa(int(fwmark)) tableStr := strconv.Itoa(int(table)) out, err := ipHelper.ExecIp("rule", "add", "fwmark", fwmarkStr, "table", tableStr) if err != nil { return err } if len(out) != 0 { return errors.New(string(out)) } defaultTimeout := uint32(300) err = netlink.IpsetDestroy(g.ipsetName) if err != nil && !os.IsNotExist(err) { return fmt.Errorf("failed to destroy ipset: %w", err) } err = netlink.IpsetCreate(g.ipsetName, "hash:ip", netlink.IpsetCreateOptions{ Timeout: &defaultTimeout, }) if err != nil { return fmt.Errorf("failed to create ipset: %w", err) } g.options.Enabled = true g.options.FWMark = fwmark g.options.Table = table return nil } func (g *Group) Disable() error { if !g.options.Enabled { return nil } fwmarkStr := strconv.Itoa(int(g.options.FWMark)) tableStr := strconv.Itoa(int(g.options.Table)) out, err := ipHelper.ExecIp("rule", "del", "fwmark", fwmarkStr, "table", tableStr) if err != nil { return err } if len(out) != 0 { return errors.New(string(out)) } err = netlink.IpsetDestroy(g.ipsetName) if err != nil && !os.IsNotExist(err) { return fmt.Errorf("failed to destroy ipset: %w", err) } g.options.Enabled = false g.options.FWMark = 0 g.options.Table = 0 return nil }