Go language exercise: Network Programming ICMP Example

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1. Code

2. Compiling and Running

1. Go Language network programming: ICMP sample code ICMPTEST.GO

1 Package Main2 3 Import (4     "FMT"5     "Net"6     "OS"7     "io"8     "bytes"9 )Ten  One Func Main () { A     ifLen (OS. Args)! =2 { -Fmt. Println ("Usage:", OS. args[0],"Host") -Os. Exit (0) the     } -Service: = OS. args[1] -  -Conn, Err: = Net. Dial ("ip4:icmp", service) + checkerror (Err) -  +     varmsg [ +]byte Amsg[0] =8 atmsg[1] =0 -msg[2] =0 -msg[3] =0 -msg[4] =0 -msg[5] = - -msg[6] =0 inmsg[7] =Panax Notoginseng -Len: =8 toCheck: = CheckSum (msg[0: Len]) +msg[2] =byte(Check >>8) -msg[3] =byte(Check &255) the  *_, Err = conn. Write (msg[0: Len]) $ checkerror (Err)Panax Notoginseng  -Fmt. Println ("Got Response") the     ifmsg[5] == - { +Fmt. Println ("Identifier matches") A     } the     ifmsg[7] ==Panax Notoginseng { +Fmt. Println ("Sequence matches") -     } $  $Os. Exit (0) - } -  theFunc checkSum (msg []byte) UInt16 { -Sum: =0Wuyi  the      forN: =1; n < len (msg)-1; n + =2 { -Sum + =int(Msg[n]) * the+int(msg[n+1]) Wu     } -sum = (Sum >> -) + (Sum &0xFFFF) Aboutsum + = (sum >> -) $     varAnswer UInt16 = uint16 (^sum) -     returnAnswer - } -  A func checkerror (err error) { +     ifErr! =Nil { theFmt. fprintf (OS. Stderr,"Fatal Error:%s\n", Err. Error ()) -Os. Exit (1) $     } the } the  theFunc readfully (Conn net. Conn) ([]byte, error) { the defer Conn. Close () -  inResult: =bytes. Newbuffer (nil) the     varBUF [ +]byte the      for { AboutN, err: = conn. Read (buf[0:]) theResult. Write (buf[0: n]) the         ifErr! =Nil { the             ifErr = =io. EOF { +                  Break -             } the             returnNil, errBayi         } the     } the  -     returnresult. Bytes (), nil -}

2. Compiling and Running

$ go Build icmptest.go $ lsicmptest  icmptest.go$. /icmptest www.baidu.comGot responseidentifier matchessequence matches