github.com/kelleygo/clashcore@v1.0.2/rules/common/ipsuffix.go (about)

     1  package common
     2  
     3  import (
     4  	C "github.com/kelleygo/clashcore/constant"
     5  	"net/netip"
     6  )
     7  
     8  type IPSuffix struct {
     9  	*Base
    10  	ipBytes     []byte
    11  	bits        int
    12  	payload     string
    13  	adapter     string
    14  	isSourceIP  bool
    15  	noResolveIP bool
    16  }
    17  
    18  func (is *IPSuffix) RuleType() C.RuleType {
    19  	if is.isSourceIP {
    20  		return C.SrcIPSuffix
    21  	}
    22  	return C.IPSuffix
    23  }
    24  
    25  func (is *IPSuffix) Match(metadata *C.Metadata) (bool, string) {
    26  	ip := metadata.DstIP
    27  	if is.isSourceIP {
    28  		ip = metadata.SrcIP
    29  	}
    30  
    31  	mIPBytes := ip.AsSlice()
    32  	if len(is.ipBytes) != len(mIPBytes) {
    33  		return false, ""
    34  	}
    35  
    36  	size := len(mIPBytes)
    37  	bits := is.bits
    38  
    39  	for i := bits / 8; i > 0; i-- {
    40  		if is.ipBytes[size-i] != mIPBytes[size-i] {
    41  			return false, ""
    42  		}
    43  	}
    44  
    45  	if (is.ipBytes[size-bits/8-1] << (8 - bits%8)) != (mIPBytes[size-bits/8-1] << (8 - bits%8)) {
    46  		return false, ""
    47  	}
    48  
    49  	return true, is.adapter
    50  }
    51  
    52  func (is *IPSuffix) Adapter() string {
    53  	return is.adapter
    54  }
    55  
    56  func (is *IPSuffix) Payload() string {
    57  	return is.payload
    58  }
    59  
    60  func (is *IPSuffix) ShouldResolveIP() bool {
    61  	return !is.noResolveIP
    62  }
    63  
    64  func NewIPSuffix(payload, adapter string, isSrc, noResolveIP bool) (*IPSuffix, error) {
    65  	ipnet, err := netip.ParsePrefix(payload)
    66  	if err != nil {
    67  		return nil, errPayload
    68  	}
    69  
    70  	return &IPSuffix{
    71  		Base:        &Base{},
    72  		payload:     payload,
    73  		ipBytes:     ipnet.Addr().AsSlice(),
    74  		bits:        ipnet.Bits(),
    75  		adapter:     adapter,
    76  		isSourceIP:  isSrc,
    77  		noResolveIP: noResolveIP,
    78  	}, nil
    79  }