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#include	"u.h"
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#include	"../port/lib.h"
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#include	"mem.h"
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#include	"dat.h"
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#include	"fns.h"
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#include	"../port/error.h"
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#include	<authsrv.h>
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char	*eve;
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char	hostdomain[DOMLEN];
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/*
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 *  return true if current user is eve
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 */
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int
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iseve(void)
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{
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	return strcmp(eve, up->user) == 0;
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}
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long
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sysfversion(ulong *arg)
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{
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	char *vers;
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	uint arglen, m, msize;
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	Chan *c;
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	msize = arg[1];
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	vers = (char*)arg[2];
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	arglen = arg[3];
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	validaddr(arg[2], arglen, 1);
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	/* check there's a NUL in the version string */
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	if(arglen==0 || memchr(vers, 0, arglen)==0)
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		error(Ebadarg);
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	c = fdtochan(arg[0], ORDWR, 0, 1);
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	if(waserror()){
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		cclose(c);
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		nexterror();
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	}
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	m = mntversion(c, vers, msize, arglen);
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	cclose(c);
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	poperror();
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	return m;
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}
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long
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sys_fsession(ulong *arg)
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{
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	/* deprecated; backwards compatibility only */
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	if(arg[2] == 0)
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		error(Ebadarg);
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	validaddr(arg[1], arg[2], 1);
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	((uchar*)arg[1])[0] = '\0';
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	return 0;
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}
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long
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sysfauth(ulong *arg)
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{
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	Chan *c, *ac;
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	char *aname;
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	int fd;
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	validaddr(arg[1], 1, 0);
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	aname = validnamedup((char*)arg[1], 1);
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	if(waserror()){
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		free(aname);
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		nexterror();
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	}
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	c = fdtochan(arg[0], ORDWR, 0, 1);
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	if(waserror()){
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		cclose(c);
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		nexterror();
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	}
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	ac = mntauth(c, aname);
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	/* at this point ac is responsible for keeping c alive */
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	poperror();	/* c */
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	cclose(c);
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	poperror();	/* aname */
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	free(aname);
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	if(waserror()){
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		cclose(ac);
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		nexterror();
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	}
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	fd = newfd(ac);
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	if(fd < 0)
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		error(Enofd);
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	poperror();	/* ac */
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	/* always mark it close on exec */
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	ac->flag |= CCEXEC;
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	return fd;
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}
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/*
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 *  called by devcons() for user device
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 *
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 *  anyone can become none
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 */
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long
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userwrite(char *a, int n)
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{
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	if(n!=4 || strncmp(a, "none", 4)!=0)
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		error(Eperm);
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	kstrdup(&up->user, "none");
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	up->basepri = PriNormal;
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	return n;
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}
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/*
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 *  called by devcons() for host owner/domain
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 *
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 *  writing hostowner also sets user
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 */
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long
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hostownerwrite(char *a, int n)
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{
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	char buf[128];
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	if(!iseve())
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		error(Eperm);
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	if(n <= 0 || n >= sizeof buf)
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		error(Ebadarg);
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	memmove(buf, a, n);
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	buf[n] = 0;
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	renameuser(eve, buf);
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	kstrdup(&eve, buf);
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	kstrdup(&up->user, buf);
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	up->basepri = PriNormal;
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	return n;
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}
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long
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hostdomainwrite(char *a, int n)
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{
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	char buf[DOMLEN];
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	if(!iseve())
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		error(Eperm);
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	if(n >= DOMLEN)
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		error(Ebadarg);
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	memset(buf, 0, DOMLEN);
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	strncpy(buf, a, n);
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	if(buf[0] == 0)
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		error(Ebadarg);
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	memmove(hostdomain, buf, DOMLEN);
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	return n;
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}