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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -20,4 +20,5 @@ wintun.dll | |
| .vscode/ | ||
| app/.idea/ | ||
| *_debug_bin* | ||
| cmd/openp2p | ||
| cmd/openp2p | ||
| vendor/ | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| package openp2p | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "os" | ||
| "time" | ||
|
|
||
| "golang.org/x/net/icmp" | ||
| "golang.org/x/net/ipv4" | ||
| ) | ||
|
|
||
| // 定义ICMP回显请求和应答的结构 | ||
| type ICMPMessage struct { | ||
| Type uint8 | ||
| Code uint8 | ||
| Checksum uint16 | ||
| Ident uint16 | ||
| Seq uint16 | ||
| Data []byte | ||
| } | ||
|
|
||
| // Ping sends an ICMP Echo request to the specified host and returns the response time. | ||
| func Ping(host string) (time.Duration, error) { | ||
| // Resolve the IP address of the host | ||
| ipAddr, err := net.ResolveIPAddr("ip4", host) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("failed to resolve host: %v", err) | ||
| } | ||
|
|
||
| // Create an ICMP listener | ||
| conn, err := net.ListenPacket("ip4:icmp", "0.0.0.0") | ||
| if err != nil { | ||
| return 0, fmt.Errorf("failed to create ICMP connection: %v", err) | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| // Create an ICMP Echo request message | ||
| message := icmp.Message{ | ||
| Type: ipv4.ICMPTypeEcho, | ||
| Code: 0, | ||
| Body: &icmp.Echo{ | ||
| ID: os.Getpid() & 0xffff, | ||
| Seq: 1, | ||
| Data: []byte("HELLO-R-U-THERE"), | ||
| }, | ||
| } | ||
|
|
||
| // Marshal the message into binary form | ||
| messageBytes, err := message.Marshal(nil) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("failed to marshal ICMP message: %v", err) | ||
| } | ||
|
|
||
| // Send the ICMP Echo request | ||
| start := time.Now() | ||
| if _, err := conn.WriteTo(messageBytes, ipAddr); err != nil { | ||
| return 0, fmt.Errorf("failed to send ICMP request: %v", err) | ||
| } | ||
|
|
||
| // Set a deadline for the response | ||
| err = conn.SetReadDeadline(time.Now().Add(3 * time.Second)) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("failed to set read deadline: %v", err) | ||
| } | ||
|
|
||
| // Read the ICMP response | ||
| response := make([]byte, 1500) | ||
| n, _, err := conn.ReadFrom(response) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("failed to read ICMP response: %v", err) | ||
| } | ||
|
|
||
| // Parse the ICMP response message | ||
| parsedMessage, err := icmp.ParseMessage(ipv4.ICMPTypeEchoReply.Protocol(), response[:n]) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("failed to parse ICMP response: %v", err) | ||
| } | ||
|
|
||
| // Check if the response is an Echo reply | ||
| if parsedMessage.Type == ipv4.ICMPTypeEchoReply { | ||
| duration := time.Since(start) | ||
| return duration, nil | ||
| } else { | ||
| return 0, fmt.Errorf("unexpected ICMP message: %+v", parsedMessage) | ||
| } | ||
| } |
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