Chap Password example?

[jenny]

Hello,

I have some enquiry on CHAP-Password for authentication. I'm trying to using
CHAP-Password using freeradius client. Trying to look for some example but
it seems there's no much example code i can use as a reference. Just
wondering how can i do that? initially, i'm using PW_USER_PASSWORD and it
works fine. here is my example code.


	if (rc_avpair_add(rh, &send, PW_USER_NAME, username, -1, 0) == NULL)
	{
		return ERROR_RC;
	}

	// fill in User-Password
	if (rc_avpair_add(rh, &send, PW_USER_PASSWORD, passwd, -1, 0) == NULL)
	{
		return ERROR_RC;
	}

but i would like to change to CHAP-Password method, i understand i need to
add the PW_CHAP_CHALLENGE as well. But I not sure how do i do that? 


	if (rc_avpair_add(rh, &send, PW_USER_NAME, username, -1, 0) == NULL)
	{
		return ERROR_RC;
	}

	// fill in Set CHAP Password
	if (rc_avpair_add(rh, &send, PW_CHAP_PASSWORD, passwd, -1, 0) == NULL)
	{
		return ERROR_RC;
	}

	chap_state * cstate;

	rc_avpair_add(&send, PW_CHAP_CHALLENGE, cstate->challenge,
cstate->chal_len);

I'm having problem on the chap_state, it couldn't find the defination. I
have installed pppd-2.4.5, but i couldn't find the library. Anyone can guide
me through how do i do chap-password please?

Also i have read the spec and some previous old thread, it said i need to do
some calculation on specific crypto calculations. I not quite understand
this, is there anyone can explain how do i do this? 

I guess there's some challenge string i need to pass in for
PW_CHAP_CHALLENGE? what should assign to it? 

Any help/advice is very appreciate. 

Many thanks.

regards,
Jenny



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