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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| package mutli | ||
|
|
||
| import ( | ||
| "net" | ||
|
|
||
| "github.com/esonhugh/k8spider/define" | ||
| ) | ||
|
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| func ScanAll(subnet *net.IPNet) (result <-chan []define.Record) { | ||
| subs := NewSubnetScanner() | ||
| result = ScanServiceWithChan(subs.ScanSubnet(subnet)) | ||
| return result | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package mutli | ||
|
|
||
| import ( | ||
| "net" | ||
| "sync" | ||
|
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| "github.com/esonhugh/k8spider/define" | ||
| "github.com/esonhugh/k8spider/pkg" | ||
| "github.com/esonhugh/k8spider/pkg/scanner" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| type SubnetScanner struct { | ||
| wg *sync.WaitGroup | ||
| } | ||
|
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| func NewSubnetScanner() *SubnetScanner { | ||
| return &SubnetScanner{ | ||
| wg: new(sync.WaitGroup), | ||
| } | ||
| } | ||
|
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| func (s *SubnetScanner) ScanSubnet(subnet *net.IPNet) <-chan []define.Record { | ||
| if subnet == nil { | ||
| log.Tracef("subnet is nil") | ||
| return nil | ||
| } | ||
| out := make(chan []define.Record, 100) | ||
| go func() { | ||
| if subnets, err := pkg.SubnetShift(subnet, 4); err != nil { | ||
| go s.scan(subnet, out) | ||
| } else { | ||
| for _, sn := range subnets { | ||
| go s.scan(sn, out) | ||
| } | ||
| } | ||
| s.wg.Wait() | ||
| close(out) | ||
| }() | ||
| return out | ||
| } | ||
|
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| func (s *SubnetScanner) scan(subnet *net.IPNet, to chan []define.Record) { | ||
| s.wg.Add(1) | ||
| to <- scanner.ScanSubnet(subnet) | ||
| s.wg.Done() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| package mutli | ||
|
|
||
| import ( | ||
| "github.com/esonhugh/k8spider/define" | ||
| "github.com/esonhugh/k8spider/pkg/scanner" | ||
| ) | ||
|
|
||
| func ScanServiceWithChan(rev <-chan []define.Record) <-chan []define.Record { | ||
| out := make(chan []define.Record, 100) | ||
| go func() { | ||
| for records := range rev { | ||
| out <- scanner.ScanSvcForPorts(records) | ||
| } | ||
| close(out) | ||
| }() | ||
| return out | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package pkg | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "math" | ||
| "net" | ||
| ) | ||
|
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| // SubnetInto wraps SubnetShift and divides a network into at least count-many, | ||
| // equal-sized subnets, which are as large as allowed. | ||
| func SubnetInto(network *net.IPNet, count int) ([]*net.IPNet, error) { | ||
| maskBits, _ := network.Mask.Size() | ||
| hostBits := 32 - maskBits | ||
| hostCount := 1 << uint(hostBits) | ||
|
|
||
| // divide hosts among subnets | ||
| ideal := float64(hostCount) / float64(count) | ||
| // largest power of 2, not exceeding the ideal (float64 to int conversion | ||
| // truncates toward zero) | ||
| newHostBits := int(math.Log2(ideal)) | ||
| shift := hostBits - newHostBits | ||
| return SubnetShift(network, shift) | ||
| } | ||
|
|
||
| // SubnetShift divides a network into subnets by shifting the given number of bits. | ||
| func SubnetShift(network *net.IPNet, bits int) ([]*net.IPNet, error) { | ||
| if bits < 0 { | ||
| return nil, fmt.Errorf("bit shift may not be negative, got %d", bits) | ||
| } | ||
| if bits > 31 { | ||
| return nil, fmt.Errorf("network subnets cannot be divided %d times", bits) | ||
| } | ||
| // network divides into 2^bits subnets | ||
| subnetCount := 1 << uint(bits) | ||
| subnets := make([]*net.IPNet, subnetCount) | ||
|
|
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| // network info | ||
| start := network.IP | ||
| maskBits, _ := network.Mask.Size() | ||
| hostBits := 32 - maskBits | ||
|
|
||
| if maskBits+bits > 32 { | ||
| return nil, fmt.Errorf("network subnet mask greater than /32, /%d is invalid", maskBits+bits) | ||
| } | ||
|
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| // divide network into subnets | ||
| newMaskBits := maskBits + bits | ||
| newHostBits := hostBits - bits | ||
| // subnet bitmasks are shifted by 'bits' places | ||
| newMask := net.CIDRMask(newMaskBits, 32) | ||
|
|
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| // hosts per subnet | ||
| hostCount := 1 << uint(newHostBits) | ||
|
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| for i := 0; i < subnetCount; i++ { | ||
| ip := numeric(start) + uint32(i*hostCount) | ||
| subnets[i] = &net.IPNet{ | ||
| IP: bytewise(ip), | ||
| Mask: newMask, | ||
| } | ||
| } | ||
|
|
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| return subnets, nil | ||
| } | ||
|
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| // IP <-> integer transforms | ||
|
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| // numeric returns a uint32 numeric representation of a net.IP. | ||
| func numeric(bytes net.IP) uint32 { | ||
| var ip uint32 | ||
| // most significant to least significant | ||
| for i, b := range []byte(bytes) { | ||
| // bitwise or ("append" in this case) | ||
| ip |= uint32(b) << (8 * uint32(3-i)) | ||
| } | ||
| return ip | ||
| } | ||
|
|
||
| // bytewise returns a net.IP byte slice alias representation of an uint32. | ||
| // Note that not all uint32 values are valid IP addresses. | ||
| func bytewise(numeric uint32) net.IP { | ||
| ip := make([]byte, 4) | ||
| // least significant to most significant | ||
| for i := 3; i >= 0; i-- { | ||
| // AND away all but least significant | ||
| ip[i] = byte(numeric & 0xFF) | ||
| // nuke least significant byte | ||
| numeric >>= 8 | ||
| } | ||
| return net.IP(ip) | ||
| } |