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#include <u.h>
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#include <libc.h>
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#include <auth.h>
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#include <authsrv.h>
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#include "authlocal.h"
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enum {
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	ARgiveup = 100,
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};
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static int
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dorpc(AuthRpc *rpc, char *verb, char *val, int len, AuthGetkey *getkey)
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{
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	int ret;
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	for(;;){
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		if((ret = auth_rpc(rpc, verb, val, len)) != ARneedkey && ret != ARbadkey)
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			return ret;
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		if(getkey == nil)
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			return ARgiveup;	/* don't know how */
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		if((*getkey)(rpc->arg) < 0)
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			return ARgiveup;	/* user punted */
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	}
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}
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int
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auth_respond(void *chal, uint nchal, char *user, uint nuser, void *resp, uint nresp, AuthGetkey *getkey, char *fmt, ...)
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{
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	char *p, *s;
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	va_list arg;
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	int afd;
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	AuthRpc *rpc;
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	Attr *a;
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	if((afd = open("/mnt/factotum/rpc", ORDWR)) < 0)
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		return -1;
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	if((rpc = auth_allocrpc(afd)) == nil){
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		close(afd);
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		return -1;
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	}
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	quotefmtinstall();	/* just in case */
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	va_start(arg, fmt);
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	p = vsmprint(fmt, arg);
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	va_end(arg);
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	if(p==nil
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	|| dorpc(rpc, "start", p, strlen(p), getkey) != ARok
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	|| dorpc(rpc, "write", chal, nchal, getkey) != ARok
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	|| dorpc(rpc, "read", nil, 0, getkey) != ARok){
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		free(p);
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		close(afd);
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		auth_freerpc(rpc);
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		return -1;
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	}
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	free(p);
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	if(rpc->narg < nresp)
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		nresp = rpc->narg;
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	memmove(resp, rpc->arg, nresp);
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	if((a = auth_attr(rpc)) != nil
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	&& (s = _strfindattr(a, "user")) != nil && strlen(s) < nuser)
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		strcpy(user, s);
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	else if(nuser > 0)
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		user[0] = '\0';
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	_freeattr(a);
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	close(afd);
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	auth_freerpc(rpc);
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	return nresp;
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}