/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <auth.h>#include <authsrv.h>#include "authlocal.h" enum {	ARgiveup = 100,}; static intdorpc(AuthRpc *rpc, char *verb, char *val, int len, AuthGetkey *getkey){	int ret; 	for(;;){		if((ret = auth_rpc(rpc, verb, val, len)) != ARneedkey && ret != ARbadkey)			return ret;		if(getkey == nil)			return ARgiveup;	/* don't know how */		if((*getkey)(rpc->arg) < 0)			return ARgiveup;	/* user punted */	}} intauth_respond(void *chal, uint nchal, char *user, uint nuser, void *resp, uint nresp, AuthGetkey *getkey, char *fmt, ...){	char *p, *s;	va_list arg;	int afd;	AuthRpc *rpc;	Attr *a; 	if((afd = open("/mnt/factotum/rpc", ORDWR)) < 0)		return -1;		if((rpc = auth_allocrpc(afd)) == nil){		close(afd);		return -1;	} 	quotefmtinstall();	/* just in case */	va_start(arg, fmt);	p = vsmprint(fmt, arg);	va_end(arg); 	if(p==nil	|| dorpc(rpc, "start", p, strlen(p), getkey) != ARok	|| dorpc(rpc, "write", chal, nchal, getkey) != ARok	|| dorpc(rpc, "read", nil, 0, getkey) != ARok){		free(p);		close(afd);		auth_freerpc(rpc);		return -1;	}	free(p); 	if(rpc->narg < nresp)		nresp = rpc->narg;	memmove(resp, rpc->arg, nresp); 	if((a = auth_attr(rpc)) != nil	&& (s = _strfindattr(a, "user")) != nil && strlen(s) < nuser)		strcpy(user, s);	else if(nuser > 0)		user[0] = '\0'; 	_freeattr(a);	close(afd);	auth_freerpc(rpc);	return nresp;	}