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cmd: implement chromecast scanner (#179)
Co-authored-by: Jonathan Pentecost <[email protected]>
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| // Copyright © 2024 Martin Holst Swende | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| package cmd | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/seancfoley/ipaddress-go/ipaddr" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
|
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| // scanCmd triggers a scan | ||
| var scanCmd = &cobra.Command{ | ||
| Use: "scan", | ||
| Short: "Scan for chromecast devices", | ||
| Run: func(cmd *cobra.Command, args []string) { | ||
| var ( | ||
| cidrAddr, _ = cmd.Flags().GetString("cidr") | ||
| port, _ = cmd.Flags().GetInt("port") | ||
| wg sync.WaitGroup | ||
| uriCh = make(chan string) | ||
| logged = time.Unix(0, 0) | ||
| start = time.Now() | ||
| count int | ||
| ipRange, err = ipaddr.NewIPAddressString(cidrAddr).ToSequentialRange() | ||
| ) | ||
| if err != nil { | ||
| exit("could not parse cidr address expression: %v", err) | ||
| } | ||
| // Use one goroutine to send URIs over a channel | ||
| go func() { | ||
| it := ipRange.Iterator() | ||
| for it.HasNext() { | ||
| uri := fmt.Sprintf("%s:%d", it.Next(), port) | ||
| if time.Since(logged) > 8*time.Second { | ||
| outputInfo("Scanning... scanned %d, current %v\n", count, uri) | ||
| logged = time.Now() | ||
| } | ||
| uriCh <- uri | ||
| count++ | ||
| } | ||
| close(uriCh) | ||
| }() | ||
| // Use a bunch of goroutines to do connect-attempts. | ||
| for i := 0; i < 64; i++ { | ||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
| dialer := &net.Dialer{ | ||
| Timeout: 400 * time.Millisecond, | ||
| } | ||
| for uri := range uriCh { | ||
| if conn, err := dialer.Dial("tcp", uri); err == nil { | ||
| conn.Close() | ||
| outputInfo("Found (potential) chromecast at %v\n", uri) | ||
| } | ||
| } | ||
| }() | ||
| } | ||
| wg.Wait() | ||
| outputInfo("Scanned %d uris in %v\n", count, time.Since(start)) | ||
| }, | ||
| } | ||
|
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| func init() { | ||
| scanCmd.Flags().String("cidr", "192.168.50.0/24", "cidr expression of subnet to scan") | ||
| scanCmd.Flags().Int("port", 8009, "port to scan for") | ||
| rootCmd.AddCommand(scanCmd) | ||
| } |
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