#include <u.h>#include <libc.h>#include <auth.h>#include "authlocal.h" static char *damsg = "problem with /dev/authenticate";static char *ccmsg = "can't call AS";static char *pbmsg = "AS protocol botch"; intgetchal(Chalstate *c, char *user){	int n;	Ticketreq tr;	char trbuf[TICKREQLEN]; 	/* get ticket request from kernel and add user name */	c->asfd = -1;	c->afd = open("/dev/authenticate", ORDWR);	if(c->afd < 0){		werrstr(damsg);		goto err;	}	n = read(c->afd, trbuf, TICKREQLEN);	if(n != TICKREQLEN){		werrstr(damsg);		goto err;	}	convM2TR(trbuf, &tr);	memset(tr.uid, 0, sizeof(tr.uid));	strcpy(tr.uid, user);	tr.type = AuthChal;	convTR2M(&tr, trbuf); 	/* send request to authentication server and get challenge */	c->asfd = authdial();	if(c->asfd < 0){		werrstr(ccmsg);		goto err;	}	if(write(c->asfd, trbuf, TICKREQLEN) != TICKREQLEN){		werrstr(pbmsg);		goto err;	}	if(_asrdresp(c->asfd, c->chal, NETCHLEN) < 0)		goto err;	return 0;err:	if(c->afd >= 0)		close(c->afd);	if(c->asfd >= 0)		close(c->asfd);	c->afd = c->asfd = -1;	return -1;} intchalreply(Chalstate *c, char *response){	char resp[NETCHLEN];	char ticket[TICKETLEN+AUTHENTLEN]; 	/* send response to auth server and get ticket */	memset(resp, 0, sizeof resp);	strncpy(resp, response, NETCHLEN-1);	if(write(c->asfd, resp, NETCHLEN) != NETCHLEN){		werrstr(pbmsg);		goto err;	}	if(_asrdresp(c->asfd, ticket, TICKETLEN+AUTHENTLEN) < 0)		goto err; 	/* pass ticket to /dev/authenticate */	if(write(c->afd, ticket, TICKETLEN+AUTHENTLEN) != TICKETLEN+AUTHENTLEN){		werrstr("permission denied");		goto err;	}	close(c->asfd);	close(c->afd);	c->afd = c->asfd = -1;	return 0;err:	if(c->afd >= 0)		close(c->afd);	if(c->asfd >= 0)		close(c->asfd);	c->afd = c->asfd = -1;	return -1;}