88 lines
2.0 KiB
Go
88 lines
2.0 KiB
Go
package route
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import (
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"strconv"
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"strings"
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"github.com/sagernet/sing-box/adapter"
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E "github.com/sagernet/sing/common/exceptions"
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)
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var ErrBadPortRange = E.New("bad port range")
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var _ RuleItem = (*PortRangeItem)(nil)
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type PortRangeItem struct {
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isSource bool
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portRanges []string
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portRangeList []rangeItem
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}
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type rangeItem struct {
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start uint16
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end uint16
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}
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func NewPortRangeItem(isSource bool, rangeList []string) (*PortRangeItem, error) {
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portRangeList := make([]rangeItem, 0, len(rangeList))
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for _, portRange := range rangeList {
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if !strings.Contains(portRange, ":") {
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return nil, E.Extend(ErrBadPortRange, portRange)
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}
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subIndex := strings.Index(portRange, ":")
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var start, end uint64
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var err error
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if subIndex > 0 {
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start, err = strconv.ParseUint(portRange[:subIndex], 10, 16)
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if err != nil {
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return nil, E.Cause(err, E.Extend(ErrBadPortRange, portRange))
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}
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}
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if subIndex == len(portRange)-1 {
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end = 0xFF
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} else {
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end, err = strconv.ParseUint(portRange[subIndex+1:], 10, 16)
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if err != nil {
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return nil, E.Cause(err, E.Extend(ErrBadPortRange, portRange))
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}
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}
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portRangeList = append(portRangeList, rangeItem{uint16(start), uint16(end)})
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}
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return &PortRangeItem{
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isSource: isSource,
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portRanges: rangeList,
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portRangeList: portRangeList,
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}, nil
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}
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func (r *PortRangeItem) Match(metadata *adapter.InboundContext) bool {
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var port uint16
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if r.isSource {
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port = metadata.Source.Port
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} else {
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port = metadata.Destination.Port
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}
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for _, portRange := range r.portRangeList {
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if port >= portRange.start && port <= portRange.end {
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return true
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}
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}
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return false
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}
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func (r *PortRangeItem) String() string {
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var description string
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if r.isSource {
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description = "source_port_range="
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} else {
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description = "port_range="
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}
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pLen := len(r.portRanges)
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if pLen == 1 {
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description += r.portRanges[0]
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} else {
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description += "[" + strings.Join(r.portRanges, " ") + "]"
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}
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return description
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}
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