/*  * 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" Chalstate*auth_challenge(char *fmt, ...){	char *p;	va_list arg;	Chalstate *c; 	quotefmtinstall();	/* just in case */	va_start(arg, fmt);	p = vsmprint(fmt, arg);	va_end(arg);	if(p == nil)		return nil; 	c = mallocz(sizeof(*c), 1);	if(c == nil){		free(p);		return nil;	} 	if((c->afd = open("/mnt/factotum/rpc", ORDWR)) < 0){	Error:		auth_freechal(c);		free(p);		return nil;	} 	if((c->rpc=auth_allocrpc(c->afd)) == nil	|| auth_rpc(c->rpc, "start", p, strlen(p)) != ARok	|| auth_rpc(c->rpc, "read", nil, 0) != ARok)		goto Error; 	if(c->rpc->narg > sizeof(c->chal)-1){		werrstr("buffer too small for challenge");		goto Error;	}	memmove(c->chal, c->rpc->arg, c->rpc->narg);	c->nchal = c->rpc->narg;	free(p);	return c;} AuthInfo*auth_response(Chalstate *c){	int ret;	AuthInfo *ai; 	ai = nil;	if(c->afd < 0){		werrstr("auth_response: connection not open");		return nil;	}	if(c->resp == nil){		werrstr("auth_response: nil response");		return nil;	}	if(c->nresp == 0){		werrstr("auth_response: unspecified response length");		return nil;	} 	if(c->user){		if(auth_rpc(c->rpc, "write", c->user, strlen(c->user)) != ARok){			/*			 * if this fails we're out of phase with factotum.			 * give up.			 */			goto Out;		}	} 	if(auth_rpc(c->rpc, "write", c->resp, c->nresp) != ARok){		/*		 * don't close the connection -- maybe we'll try again.		 */		return nil;	} 	switch(ret = auth_rpc(c->rpc, "read", nil, 0)){	case ARok:	default:		werrstr("factotum protocol botch %d %s", ret, c->rpc->ibuf);		break;	case ARdone:		ai = auth_getinfo(c->rpc);		break;	} Out:	close(c->afd);	auth_freerpc(c->rpc);	c->afd = -1;	c->rpc = nil;	return ai;} voidauth_freechal(Chalstate *c){	if(c == nil)		return; 	if(c->afd >= 0)		close(c->afd);	if(c->rpc != nil)		auth_freerpc(c->rpc); 	memset(c, 0xBB, sizeof(*c));	free(c);}