sing-box/route/rule_item_port_range.go

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