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Implements network scanner in pure go (no reliance on nmap)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| package discovery | ||
|
|
||
| import ( | ||
| "crypto/sha1" | ||
| "encoding/hex" | ||
| "net" | ||
| "regexp" | ||
| "strings" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/projectdiscovery/mapcidr" | ||
| "github.com/robgonnella/ops/internal/logger" | ||
| "github.com/robgonnella/ops/internal/server" | ||
| ) | ||
|
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| var cidrSuffix = regexp.MustCompile(`\/\d{2}$`) | ||
|
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| type NetScanner struct { | ||
| canceled bool | ||
| targets []string | ||
| wg sync.WaitGroup | ||
| log logger.Logger | ||
| } | ||
|
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| func NewNetScanner(targets []string) *NetScanner { | ||
| return &NetScanner{ | ||
| canceled: false, | ||
| targets: targets, | ||
| wg: sync.WaitGroup{}, | ||
| log: logger.New(), | ||
| } | ||
| } | ||
|
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| func (s *NetScanner) Scan() ([]*DiscoveryResult, error) { | ||
| s.log.Info().Msg("Scanning network...") | ||
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| results := []*DiscoveryResult{} | ||
| // allow 1000 concurrent connections | ||
| semaphore := make(chan struct{}, 1000) | ||
|
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| for _, t := range s.targets { | ||
| if s.canceled { | ||
| break | ||
| } | ||
|
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| if cidrSuffix.MatchString(t) { | ||
| ips, err := mapcidr.IPAddresses(t) | ||
|
|
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| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| for _, ip := range ips { | ||
| semaphore <- struct{}{} // acquire | ||
| s.wg.Add(1) | ||
| go func(i string, res []*DiscoveryResult) { | ||
| r := s.scanIP(i, semaphore) | ||
| results = append(results, r) | ||
| }(ip, results) | ||
| } | ||
| } else { | ||
| semaphore <- struct{}{} // acquire | ||
| s.wg.Add(1) | ||
| go func(i string, res []*DiscoveryResult) { | ||
| r := s.scanIP(i, semaphore) | ||
| results = append(results, r) | ||
| }(t, results) | ||
| } | ||
| } | ||
|
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| s.wg.Wait() | ||
|
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| return results, nil | ||
| } | ||
|
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| func (s *NetScanner) Stop() { | ||
| s.canceled = true | ||
| } | ||
|
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| func (s *NetScanner) scanIP(ip string, semaphore chan struct{}) *DiscoveryResult { | ||
| s.wg.Done() | ||
|
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| hashedIP := sha1.Sum([]byte(ip)) | ||
| id := hex.EncodeToString(hashedIP[:]) | ||
|
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| r := DiscoveryResult{ | ||
| ID: id, | ||
| Hostname: "", | ||
| IP: ip, | ||
| OS: "", | ||
| Status: server.StatusOffline, | ||
| } | ||
|
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| s.log.Info().Str("ip", ip).Msg("Scanning target") | ||
|
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| timeOut := time.Millisecond * 3000 | ||
| conn, err := net.DialTimeout("tcp", ip+":22", timeOut) | ||
|
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| if err != nil { | ||
| r.Ports = []Port{{ID: 22, Status: PortClosed}} | ||
|
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| s.log.Error().Err(err).Msg("network scanning error") | ||
|
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| if _, ok := err.(*net.OpError); ok { | ||
| if strings.HasSuffix(err.Error(), "connect: connection refused") { | ||
| r.Status = server.StatusOnline | ||
| } | ||
| } | ||
| } else { | ||
| defer conn.Close() | ||
| r.Status = server.StatusOnline | ||
| r.Ports = []Port{{ID: 22, Status: PortOpen}} | ||
| } | ||
|
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| // release | ||
| <-semaphore | ||
|
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| return &r | ||
| } |
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