Using expect library to automate task in c++ programming on unix.

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Hi friends,
I am creating a program on unix which will telnet a remote host on ip -->(xx.xxx.xx.xx) and run a command on the remote host and display the response returned by the remote host.
I have googled a lot and I found using the expect library might help so I am using expect library without tcl.

I am doing this

string myUser="97.253.46.90";<br />
string myPORT="23";<br />
myFD = exp_spawnl("telnet","telnet",myUser,myPORT,(char *)0);<br />

this returns 4 in myFD what should I do next ?
Please help me guys I am new to codeproject so please dont mind if I have made any mistakes.
Thanks and regards.
rocksean30

Posted 1-Jul-13 21:03pm

rocksean30

Updated 2-Jul-13 1:22am

v4

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Richard MacCutchan 2-Jul-13 9:06am

Did you follow the link I gave you and read the documentation?

2 solutions

Solution 1

See http://www.eso.org/projects/vlt/sw-dev/tcl8.3.3/expect5.32/libexpect.3.html[^].

Posted 1-Jul-13 21:37pm

Richard MacCutchan

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Mathew Fer 28-Oct-13 19:29pm

Hi rocksean30,

I am also interested in this and can you please share the code to interact with a unix host using C++?

My email - mathewfer@gmail.com

Thanks

Mathew

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rocksean30 · Accepted Answer · 2013-07-22T20:57:00

The next step is to wait for the result and check it you've got the desired results.
This is what I did.

enum HOST_STATE { AVAILABLE,
BUSY,
CONFIRM,
UNKNOWN,
FAILED,
REFUSED};

string myUser="97.253.46.90";
string myPORT="23";
int connected=0;
int myFD = exp_spawnl("telnet","telnet",myUser,myPORT,(char *)0);
sleep(1); // wait a second before get result

exp_timeout = CONNECTION_EXPIRY_PERIOD;

int expresult = exp_expectl(fd,exp_glob,"Permission denied",UNKNOWN,
exp_glob,"Invalid password",UNKNOWN,
exp_glob,"Access denied",UNKNOWN,
exp_glob,"Are you sure you want to continue",CONFIRM,
exp_glob,"busy",BUSY,
exp_glob,"Unknown host",UNKNOWN,
exp_glob,"Unable to connect to remote host",FAILED,
exp_glob,"failed",FAILED,
exp_glob,"Connection refused",REFUSED,
exp_glob,"closed by foreign host",FAILED,
exp_glob,"Connected to", AVAILABLE,
exp_end);

//cout<<"connect() Result: "<<expresult<<endl;

error = 0;
switch (expresult)
{
case AVAILABLE:
{
cout<<" Telnet host available " << endl;
break;
}
case CONFIRM:
{
cout<<"CONFIRM RSA key fingerprint"<<endl;
cout<<"yes or no need to be fired"<<endl;
break;
}
case BUSY:
{
cout<<"Telnet host busy";
error = 1;
break;
}
case UNKNOWN:
{
cout<<"Telnet host unknown"<<endl;
error = 1;
break;
}
case FAILED:
{
cout<<"Telnet host failed"<<endl;
error = 1;
break;
}
case REFUSED:
{
cout<<"Telnet host refused connection"<<endl;
error = 1;
break;
}
case EXP_TIMEOUT:
{
cout<<"Telnet host timeout"<<endl;
error = 1;
break;
}
case EXP_ABEOF:
{
cout<<"Expect abbnormal eof"<<endl;
error = 1;
break;
}
default:
{
cout<<"Telnet host problem"<<endl;
error = 1;
break;
}
}

if (error)
{
connected=0;
return 0;
}
else
{
connected=1;
return 1;
}

Thanks & Regards
rocksean30