/* * Server-side symbolic link object management * * Copyright (C) 2005 Vitaliy Margolen * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA * */ #include "config.h" #include "wine/port.h" #include <assert.h> #include <stdarg.h> #include <stdlib.h> #include <stdio.h> #include <sys/types.h> #include "ntstatus.h" #define WIN32_NO_STATUS #include "winternl.h" #include "ddk/wdm.h" #include "handle.h" #include "request.h" #include "object.h" #include "unicode.h" struct symlink { struct object obj; /* object header */ WCHAR *target; /* target of the symlink */ data_size_t len; /* target len in bytes */ }; static void symlink_dump( struct object *obj, int verbose ); static struct object_type *symlink_get_type( struct object *obj ); static unsigned int symlink_map_access( struct object *obj, unsigned int access ); static struct object *symlink_lookup_name( struct object *obj, struct unicode_str *name, unsigned int attr ); static void symlink_destroy( struct object *obj ); static const struct object_ops symlink_ops = { sizeof(struct symlink), /* size */ symlink_dump, /* dump */ symlink_get_type, /* get_type */ no_add_queue, /* add_queue */ NULL, /* remove_queue */ NULL, /* signaled */ NULL, /* satisfied */ no_signal, /* signal */ no_get_fd, /* get_fd */ symlink_map_access, /* map_access */ default_get_sd, /* get_sd */ default_set_sd, /* set_sd */ symlink_lookup_name, /* lookup_name */ directory_link_name, /* link_name */ default_unlink_name, /* unlink_name */ no_open_file, /* open_file */ no_kernel_obj_list, /* get_kernel_obj_list */ no_close_handle, /* close_handle */ symlink_destroy /* destroy */ }; static void symlink_dump( struct object *obj, int verbose ) { struct symlink *symlink = (struct symlink *)obj; assert( obj->ops == &symlink_ops ); fputs( "Symlink target=\"", stderr ); dump_strW( symlink->target, symlink->len, stderr, "\"\"" ); fputs( "\"\n", stderr ); } static struct object_type *symlink_get_type( struct object *obj ) { static const WCHAR name[] = {'S','y','m','b','o','l','i','c','L','i','n','k'}; static const struct unicode_str str = { name, sizeof(name) }; return get_object_type( &str ); } static struct object *symlink_lookup_name( struct object *obj, struct unicode_str *name, unsigned int attr ) { struct symlink *symlink = (struct symlink *)obj; struct unicode_str target_str, name_left; struct object *target; assert( obj->ops == &symlink_ops ); if (!name) return NULL; if (!name->len && (attr & OBJ_OPENLINK)) return NULL; target_str.str = symlink->target; target_str.len = symlink->len; if ((target = lookup_named_object( NULL, &target_str, attr, &name_left ))) { if (name_left.len) { release_object( target ); target = NULL; set_error( STATUS_OBJECT_PATH_NOT_FOUND ); } } return target; } static unsigned int symlink_map_access( struct object *obj, unsigned int access ) { if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SYMBOLIC_LINK_QUERY; if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE; if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE; if (access & GENERIC_ALL) access |= SYMBOLIC_LINK_ALL_ACCESS; return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL); } static void symlink_destroy( struct object *obj ) { struct symlink *symlink = (struct symlink *)obj; assert( obj->ops == &symlink_ops ); free( symlink->target ); } static struct symlink *create_symlink( struct object *root, const struct unicode_str *name, unsigned int attr, const struct unicode_str *target, const struct security_descriptor *sd ) { struct symlink *symlink; if (!target->len) { set_error( STATUS_INVALID_PARAMETER ); return NULL; } if ((symlink = create_named_object( root, &symlink_ops, name, attr, sd )) && (get_error() != STATUS_OBJECT_NAME_EXISTS)) { if ((symlink->target = memdup( target->str, target->len ))) { symlink->len = target->len; } else { release_object( symlink ); symlink = NULL; } } return symlink; } /* create a symlink pointing to an existing object */ struct object *create_obj_symlink( struct object *root, const struct unicode_str *name, unsigned int attr, struct object *target, const struct security_descriptor *sd ) { struct symlink *symlink; data_size_t len; WCHAR *target_name; if (!(target_name = get_object_full_name( target, &len ))) { set_error( STATUS_INVALID_PARAMETER ); return NULL; } if ((symlink = create_named_object( root, &symlink_ops, name, attr, sd )) && (get_error() != STATUS_OBJECT_NAME_EXISTS)) { symlink->target = target_name; symlink->len = len; } else free( target_name ); return &symlink->obj; } /* create a symbolic link object */ DECL_HANDLER(create_symlink) { struct symlink *symlink; struct unicode_str name, target; struct object *root; const struct security_descriptor *sd; const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root ); if (!objattr) return; target.str = get_req_data_after_objattr( objattr, &target.len ); target.len = (target.len / sizeof(WCHAR)) * sizeof(WCHAR); if ((symlink = create_symlink( root, &name, objattr->attributes, &target, sd ))) { reply->handle = alloc_handle( current->process, symlink, req->access, objattr->attributes ); release_object( symlink ); } if (root) release_object( root ); } /* open a symbolic link object */ DECL_HANDLER(open_symlink) { struct unicode_str name = get_req_unicode_str(); reply->handle = open_object( current->process, req->rootdir, req->access, &symlink_ops, &name, req->attributes | OBJ_OPENLINK ); } /* query a symbolic link object */ DECL_HANDLER(query_symlink) { struct symlink *symlink; symlink = (struct symlink *)get_handle_obj( current->process, req->handle, SYMBOLIC_LINK_QUERY, &symlink_ops ); if (!symlink) return; reply->total = symlink->len; if (get_reply_max_size() < symlink->len) set_error( STATUS_BUFFER_TOO_SMALL ); else set_reply_data( symlink->target, symlink->len ); release_object( symlink ); }