1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 /* 30 * Portions of this source code were derived from Berkeley 4.3 BSD 31 * under license from the Regents of the University of California. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/isa_defs.h> 36 #include <sys/types.h> 37 #include <sys/sysmacros.h> 38 #include <sys/systm.h> 39 #include <sys/errno.h> 40 #include <sys/pathname.h> 41 #include <sys/vfs.h> 42 #include <sys/vnode.h> 43 #include <sys/file.h> 44 #include <sys/fcntl.h> 45 #include <sys/proc.h> 46 #include <sys/uio.h> 47 #include <sys/debug.h> 48 #include <c2/audit.h> 49 #include <fs/fs_subr.h> 50 51 /* 52 * Create a symbolic link. Similar to link or rename except target 53 * name is passed as string argument, not converted to vnode reference. 54 */ 55 int 56 symlinkat(char *target, int dfd, char *linkname) 57 { 58 vnode_t *startvp; 59 vnode_t *dvp; 60 struct vattr vattr; 61 struct pathname lpn; 62 char *tbuf; 63 size_t tlen; 64 int error; 65 int estale_retry = 0; 66 int auditing = AU_AUDITING(); 67 68 if (linkname == NULL) 69 return (set_errno(EFAULT)); 70 if ((error = fgetstartvp(dfd, linkname, &startvp)) != 0) 71 return (set_errno(error)); 72 73 top: 74 if (error = pn_get(linkname, UIO_USERSPACE, &lpn)) 75 goto out; 76 if (auditing && startvp != NULL) 77 audit_setfsat_path(2); 78 if (error = lookuppnat(&lpn, NULL, NO_FOLLOW, &dvp, NULLVPP, startvp)) { 79 pn_free(&lpn); 80 if (error == ESTALE && fs_need_estale_retry(estale_retry++)) 81 goto top; 82 goto out; 83 } 84 if (vn_is_readonly(dvp)) 85 error = EROFS; 86 else if (pn_fixslash(&lpn)) 87 error = ENOTDIR; 88 else { 89 tbuf = kmem_alloc(MAXPATHLEN, KM_SLEEP); 90 if ((error = copyinstr(target, tbuf, MAXPATHLEN, &tlen)) == 0) { 91 vattr.va_type = VLNK; 92 vattr.va_mode = 0777; 93 vattr.va_mask = AT_TYPE|AT_MODE; 94 error = VOP_SYMLINK(dvp, lpn.pn_path, &vattr, 95 tbuf, CRED(), NULL, 0); 96 if (auditing) 97 audit_symlink_create(dvp, lpn.pn_path, 98 tbuf, error); 99 } 100 kmem_free(tbuf, MAXPATHLEN); 101 } 102 pn_free(&lpn); 103 VN_RELE(dvp); 104 if (error == ESTALE && fs_need_estale_retry(estale_retry++)) 105 goto top; 106 out: 107 if (startvp != NULL) 108 VN_RELE(startvp); 109 if (error) 110 return (set_errno(error)); 111 return (0); 112 } 113 114 int 115 symlink(char *target, char *linkname) 116 { 117 return (symlinkat(target, AT_FDCWD, linkname)); 118 } 119