Esempio n. 1
0
int
nfsm_adv_xx(int s, struct mbuf **md, caddr_t *dpos)
{
	int t1;

	t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
	if (t1 >= s) {
		*dpos += s;
		return (0);
	}
	t1 = nfs_adv(md, dpos, s, t1);
	if (t1)
		return (t1);
	return (0);
}
Esempio n. 2
0
/*
 * copies mbuf chain to the uio scatter/gather list
 */
int
nfsm_mbuftouio(struct mbuf **mrep, struct uio *uiop, int siz, caddr_t *dpos)
{
	char *mbufcp, *uiocp;
	int xfer, left, len;
	struct mbuf *mp;
	long uiosiz, rem;
	int error = 0;

	mp = *mrep;
	mbufcp = *dpos;
	len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
	rem = nfsm_rndup(siz)-siz;
	while (siz > 0) {
		if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
			return (EFBIG);
		left = uiop->uio_iov->iov_len;
		uiocp = uiop->uio_iov->iov_base;
		if (left > siz)
			left = siz;
		uiosiz = left;
		while (left > 0) {
			while (len == 0) {
				mp = mp->m_next;
				if (mp == NULL)
					return (EBADRPC);
				mbufcp = mtod(mp, caddr_t);
				len = mp->m_len;
			}
			xfer = (left > len) ? len : left;
#ifdef notdef
			/* Not Yet.. */
			if (uiop->uio_iov->iov_op != NULL)
				(*(uiop->uio_iov->iov_op))
				(mbufcp, uiocp, xfer);
			else
#endif
			if (uiop->uio_segflg == UIO_SYSSPACE)
				bcopy(mbufcp, uiocp, xfer);
			else
				copyout(mbufcp, uiocp, xfer);
			left -= xfer;
			len -= xfer;
			mbufcp += xfer;
			uiocp += xfer;
			uiop->uio_offset += xfer;
			uiop->uio_resid -= xfer;
		}
		if (uiop->uio_iov->iov_len <= siz) {
			uiop->uio_iovcnt--;
			uiop->uio_iov++;
		} else {
			uiop->uio_iov->iov_base =
			    (char *)uiop->uio_iov->iov_base + uiosiz;
			uiop->uio_iov->iov_len -= uiosiz;
		}
		siz -= uiosiz;
	}
	*dpos = mbufcp;
	*mrep = mp;
	if (rem > 0) {
		if (len < rem)
			error = nfs_adv(mrep, dpos, rem, len);
		else
			*dpos += rem;
	}
	return (error);
}
Esempio n. 3
0
/*
 * Set up nameidata for a lookup() call and do it.
 *
 * If pubflag is set, this call is done for a lookup operation on the
 * public filehandle. In that case we allow crossing mountpoints and
 * absolute pathnames. However, the caller is expected to check that
 * the lookup result is within the public fs, and deny access if
 * it is not.
 *
 * nfs_namei() clears out garbage fields that namei() might leave garbage.
 * This is mainly ni_vp and ni_dvp when an error occurs, and ni_dvp when no
 * error occurs but the parent was not requested.
 *
 * dirp may be set whether an error is returned or not, and must be
 * released by the caller.
 */
int
nfs_namei(struct nameidata *ndp, struct nfsrv_descript *nfsd,
    fhandle_t *fhp, int len, struct nfssvc_sock *slp,
    struct sockaddr *nam, struct mbuf **mdp,
    caddr_t *dposp, struct vnode **retdirp, int v3, struct vattr *retdirattrp,
    int *retdirattr_retp, int pubflag)
{
	int i, rem;
	struct mbuf *md;
	char *fromcp, *tocp, *cp;
	struct iovec aiov;
	struct uio auio;
	struct vnode *dp;
	int error, rdonly, linklen;
	struct componentname *cnp = &ndp->ni_cnd;
	int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0;

	*retdirp = NULL;
	cnp->cn_flags |= NOMACCHECK;
	cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);

	/*
	 * Copy the name from the mbuf list to ndp->ni_pnbuf
	 * and set the various ndp fields appropriately.
	 */
	fromcp = *dposp;
	tocp = cnp->cn_pnbuf;
	md = *mdp;
	rem = mtod(md, caddr_t) + md->m_len - fromcp;
	for (i = 0; i < len; i++) {
		while (rem == 0) {
			md = md->m_next;
			if (md == NULL) {
				error = EBADRPC;
				goto out;
			}
			fromcp = mtod(md, caddr_t);
			rem = md->m_len;
		}
		if (*fromcp == '\0' || (!pubflag && *fromcp == '/')) {
			error = EACCES;
			goto out;
		}
		*tocp++ = *fromcp++;
		rem--;
	}
	*tocp = '\0';
	*mdp = md;
	*dposp = fromcp;
	len = nfsm_rndup(len)-len;
	if (len > 0) {
		if (rem >= len)
			*dposp += len;
		else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0)
			goto out;
	}

	if (!pubflag && nfs_ispublicfh(fhp))
		return (ESTALE);

	/*
	 * Extract and set starting directory.
	 */
	error = nfsrv_fhtovp(fhp, 0, &dp, nfsd, slp, nam, &rdonly);
	if (error)
		goto out;
	if (dp->v_type != VDIR) {
		vput(dp);
		error = ENOTDIR;
		goto out;
	}

	if (rdonly)
		cnp->cn_flags |= RDONLY;

	/*
	 * Set return directory.  Reference to dp is implicitly transfered
	 * to the returned pointer
	 */
	*retdirp = dp;
	if (v3) {
		*retdirattr_retp = VOP_GETATTR(dp, retdirattrp,
			ndp->ni_cnd.cn_cred);
	}

	VOP_UNLOCK(dp, 0);

	if (pubflag) {
		/*
		 * Oh joy. For WebNFS, handle those pesky '%' escapes,
		 * and the 'native path' indicator.
		 */
		cp = uma_zalloc(namei_zone, M_WAITOK);
		fromcp = cnp->cn_pnbuf;
		tocp = cp;
		if ((unsigned char)*fromcp >= WEBNFS_SPECCHAR_START) {
			switch ((unsigned char)*fromcp) {
			case WEBNFS_NATIVE_CHAR:
				/*
				 * 'Native' path for us is the same
				 * as a path according to the NFS spec,
				 * just skip the escape char.
				 */
				fromcp++;
				break;
			/*
			 * More may be added in the future, range 0x80-0xff
			 */
			default:
				error = EIO;
				uma_zfree(namei_zone, cp);
				goto out;
			}
		}
		/*
		 * Translate the '%' escapes, URL-style.
		 */
		while (*fromcp != '\0') {
			if (*fromcp == WEBNFS_ESC_CHAR) {
				if (fromcp[1] != '\0' && fromcp[2] != '\0') {
					fromcp++;
					*tocp++ = HEXSTRTOI(fromcp);
					fromcp += 2;
					continue;
				} else {
					error = ENOENT;
					uma_zfree(namei_zone, cp);
					goto out;
				}
			} else
				*tocp++ = *fromcp++;
		}
		*tocp = '\0';
		uma_zfree(namei_zone, cnp->cn_pnbuf);
		cnp->cn_pnbuf = cp;
	}

	ndp->ni_pathlen = (tocp - cnp->cn_pnbuf) + 1;
	ndp->ni_segflg = UIO_SYSSPACE;

	if (pubflag) {
		ndp->ni_rootdir = rootvnode;
		ndp->ni_loopcnt = 0;

		if (cnp->cn_pnbuf[0] == '/')
			dp = rootvnode;
	} else {
		cnp->cn_flags |= NOCROSSMOUNT;
	}

	/*
	 * Initialize for scan, set ni_startdir and bump ref on dp again
	 * because lookup() will dereference ni_startdir.
	 */

	cnp->cn_thread = curthread;
	VREF(dp);
	ndp->ni_startdir = dp;

	if (!lockleaf)
		cnp->cn_flags |= LOCKLEAF;
	for (;;) {
		cnp->cn_nameptr = cnp->cn_pnbuf;
		/*
		 * Call lookup() to do the real work.  If an error occurs,
		 * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
		 * we do not have to dereference anything before returning.
		 * In either case ni_startdir will be dereferenced and NULLed
		 * out.
		 */
		error = lookup(ndp);
		if (error)
			break;

		/*
		 * Check for encountering a symbolic link.  Trivial
		 * termination occurs if no symlink encountered.
		 * Note: zfree is safe because error is 0, so we will
		 * not zfree it again when we break.
		 */
		if ((cnp->cn_flags & ISSYMLINK) == 0) {
			if (cnp->cn_flags & (SAVENAME | SAVESTART))
				cnp->cn_flags |= HASBUF;
			else
				uma_zfree(namei_zone, cnp->cn_pnbuf);
			if (ndp->ni_vp && !lockleaf)
				VOP_UNLOCK(ndp->ni_vp, 0);
			break;
		}

		/*
		 * Validate symlink
		 */
		if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
			VOP_UNLOCK(ndp->ni_dvp, 0);
		if (!pubflag) {
			error = EINVAL;
			goto badlink2;
		}

		if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
			error = ELOOP;
			goto badlink2;
		}
		if (ndp->ni_pathlen > 1)
			cp = uma_zalloc(namei_zone, M_WAITOK);
		else
			cp = cnp->cn_pnbuf;
		aiov.iov_base = cp;
		aiov.iov_len = MAXPATHLEN;
		auio.uio_iov = &aiov;
		auio.uio_iovcnt = 1;
		auio.uio_offset = 0;
		auio.uio_rw = UIO_READ;
		auio.uio_segflg = UIO_SYSSPACE;
		auio.uio_td = NULL;
		auio.uio_resid = MAXPATHLEN;
		error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
		if (error) {
		badlink1:
			if (ndp->ni_pathlen > 1)
				uma_zfree(namei_zone, cp);
		badlink2:
			vput(ndp->ni_vp);
			vrele(ndp->ni_dvp);
			break;
		}
		linklen = MAXPATHLEN - auio.uio_resid;
		if (linklen == 0) {
			error = ENOENT;
			goto badlink1;
		}
		if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
			error = ENAMETOOLONG;
			goto badlink1;
		}

		/*
		 * Adjust or replace path
		 */
		if (ndp->ni_pathlen > 1) {
			bcopy(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
			uma_zfree(namei_zone, cnp->cn_pnbuf);
			cnp->cn_pnbuf = cp;
		} else
			cnp->cn_pnbuf[linklen] = '\0';
		ndp->ni_pathlen += linklen;

		/*
		 * Cleanup refs for next loop and check if root directory
		 * should replace current directory.  Normally ni_dvp
		 * becomes the new base directory and is cleaned up when
		 * we loop.  Explicitly null pointers after invalidation
		 * to clarify operation.
		 */
		vput(ndp->ni_vp);
		ndp->ni_vp = NULL;

		if (cnp->cn_pnbuf[0] == '/') {
			vrele(ndp->ni_dvp);
			ndp->ni_dvp = ndp->ni_rootdir;
			VREF(ndp->ni_dvp);
		}
		ndp->ni_startdir = ndp->ni_dvp;
		ndp->ni_dvp = NULL;
	}
	if (!lockleaf)
		cnp->cn_flags &= ~LOCKLEAF;

	/*
	 * nfs_namei() guarentees that fields will not contain garbage
	 * whether an error occurs or not.  This allows the caller to track
	 * cleanup state trivially.
	 */
out:
	if (error) {
		uma_zfree(namei_zone, cnp->cn_pnbuf);
		ndp->ni_vp = NULL;
		ndp->ni_dvp = NULL;
		ndp->ni_startdir = NULL;
		cnp->cn_flags &= ~HASBUF;
	} else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
		ndp->ni_dvp = NULL;
	}
	return (error);
}