英文:
Not able to find function Marshal()
问题
我正在为生成ICMP数据包编写一小段代码。为此，我正在参考golang net包中的代码。
我找到了以下用于生成ICMP数据包的代码：
109 c, err := Dial(tt.net, tt.raddr)
110 if err != nil {
111 t.Fatalf("Dial failed: %v", err)
112 }
113 c.SetDeadline(time.Now().Add(100 * time.Millisecond))
114 defer c.Close()
115
116 typ := icmpv4EchoRequest
117 if net == "ip6" {
118 typ = icmpv6EchoRequest
119 }
120 xid, xseq := os.Getpid()&0xffff, i+1
121 wb, err := (&icmpMessage{
122 Type: typ, Code: 0,
123 Body: &icmpEcho{
124 ID: xid, Seq: xseq,
125 Data: bytes.Repeat([]byte("Go Go Gadget Ping!!!"), 3),
126 },
127 }).Marshal()
128 if err != nil {
129 t.Fatalf("icmpMessage.Marshal failed: %v", err)
130 }
131 if _, err := c.Write(wb); err != nil {
132 t.Fatalf("Conn.Write failed: %v", err)
133 }
我无法理解代码中的以下部分：
-
Marshal()函数在net包文档中没有包含，请告诉我如何找到这个函数，以及为什么它没有包含在net包中。 -
请解释一下第121行的代码（
icmpMessage结构体和函数调用），因为这些在文件中没有定义。
英文:
I am writing small code for generating the ICMP packet. For that I am following the code from golang net package.
I identified the following code to use for ICMP packet generation:
109 c, err := Dial(tt.net, tt.raddr)
110 if err != nil {
111 t.Fatalf("Dial failed: %v", err)
112 }
113 c.SetDeadline(time.Now().Add(100 * time.Millisecond))
114 defer c.Close()
115
116 typ := icmpv4EchoRequest
117 if net == "ip6" {
118 typ = icmpv6EchoRequest
119 }
120 xid, xseq := os.Getpid()&0xffff, i+1
121 wb, err := (&icmpMessage{
122 Type: typ, Code: 0,
123 Body: &icmpEcho{
124 ID: xid, Seq: xseq,
125 Data: bytes.Repeat([]byte("Go Go Gadget Ping!!!"), 3),
126 },
127 }).Marshal()
128 if err != nil {
129 t.Fatalf("icmpMessage.Marshal failed: %v", err)
130 }
131 if _, err := c.Write(wb); err != nil {
132 t.Fatalf("Conn.Write failed: %v", err)
133 }
I am not able to understand followings in this code :
-
Marshal()is not included in the net package documentation, please let me know how to find this function and why it is not included in the net package. -
please explain me line #121 (
icmpMessagestruct and function calling as these are not defined in this file).
答案1
得分: 0
- Marshal() 在这里定义：https://golang.org/src/net/mockicmp_test.go?h=Marshal#L32
- icmpMessage 结构体在这里定义：https://golang.org/src/net/mockicmp_test.go?h=icmpMessage#L17
英文:
- Marshal() defined here https://golang.org/src/net/mockicmp_test.go?h=Marshal#L32
- And icmpMessage struct here https://golang.org/src/net/mockicmp_test.go?h=icmpMessage#L17
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