Move the uglyness of #ifdef REALPATH_TAKES_NULL into the vfs_default

module, change the signature of VFS_REALPATH to always return a
malloc'ed string.

Needed to make some privileges work I plan on doing shortly
easier to code.

Jeremy.

Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Sat Nov 20 02:15:50 CET 2010 on sn-devel-104

14 files changed, 51 insertions, 82 deletions

diff --git a/examples/VFS/skel_opaque.c b/examples/VFS/skel_opaque.c
index a7814957de..42f4e48cd9 100644
--- a/examples/VFS/skel_opaque.c
+++ b/examples/VFS/skel_opaque.c
@@ -356,7 +356,7 @@ static int skel_mknod(vfs_handle_struct *handle,  const char *path, mode_t mode,
 	return -1;
 }
 
-static char *skel_realpath(vfs_handle_struct *handle,  const char *path, char *resolved_path)
+static char *skel_realpath(vfs_handle_struct *handle,  const char *path)
 {
 	errno = ENOSYS;
 	return NULL;
diff --git a/examples/VFS/skel_transparent.c b/examples/VFS/skel_transparent.c
index 3be5cf9336..42e54a8871 100644
--- a/examples/VFS/skel_transparent.c
+++ b/examples/VFS/skel_transparent.c
@@ -332,9 +332,9 @@ static int skel_mknod(vfs_handle_struct *handle,  const char *path, mode_t mode,
 	return SMB_VFS_NEXT_MKNOD(handle, path, mode, dev);
 }
 
-static char *skel_realpath(vfs_handle_struct *handle,  const char *path, char *resolved_path)
+static char *skel_realpath(vfs_handle_struct *handle,  const char *path)
 {
-	return SMB_VFS_NEXT_REALPATH(handle, path, resolved_path);
+	return SMB_VFS_NEXT_REALPATH(handle, path);
 }
 
 static NTSTATUS skel_notify_watch(struct vfs_handle_struct *handle,
diff --git a/source3/include/vfs.h b/source3/include/vfs.h
index 9ec4c3ec69..9121069a27 100644
--- a/source3/include/vfs.h
+++ b/source3/include/vfs.h
@@ -126,6 +126,8 @@
 /* Leave at 27 - not yet released. Add translate_name VFS call to convert
 		 UNIX names to Windows supported names -- asrinivasan. */
 /* Changed to version 28 - Add private_flags uint32_t to CREATE call. */
+/* Leave at 28 - not yet released. Change realpath to assume NULL and return a
+		 malloc'ed path. JRA. */
 #define SMB_VFS_INTERFACE_VERSION 28
 
 
@@ -257,7 +259,7 @@ struct vfs_fn_pointers {
 	int (*vfs_readlink)(struct vfs_handle_struct *handle, const char *path, char *buf, size_t bufsiz);
 	int (*link)(struct vfs_handle_struct *handle, const char *oldpath, const char *newpath);
 	int (*mknod)(struct vfs_handle_struct *handle, const char *path, mode_t mode, SMB_DEV_T dev);
-	char *(*realpath)(struct vfs_handle_struct *handle, const char *path, char *resolved_path);
+	char *(*realpath)(struct vfs_handle_struct *handle, const char *path);
 	NTSTATUS (*notify_watch)(struct vfs_handle_struct *handle,
 				 struct sys_notify_context *ctx,
 				 struct notify_entry *e,
@@ -619,8 +621,7 @@ int smb_vfs_call_link(struct vfs_handle_struct *handle, const char *oldpath,
 		      const char *newpath);
 int smb_vfs_call_mknod(struct vfs_handle_struct *handle, const char *path,
 		       mode_t mode, SMB_DEV_T dev);
-char *smb_vfs_call_realpath(struct vfs_handle_struct *handle,
-			    const char *path, char *resolved_path);
+char *smb_vfs_call_realpath(struct vfs_handle_struct *handle, const char *path);
 NTSTATUS smb_vfs_call_notify_watch(struct vfs_handle_struct *handle,
 				   struct sys_notify_context *ctx,
 				   struct notify_entry *e,
diff --git a/source3/include/vfs_macros.h b/source3/include/vfs_macros.h
index 4472e3a52a..5b38e64cbf 100644
--- a/source3/include/vfs_macros.h
+++ b/source3/include/vfs_macros.h
@@ -289,10 +289,10 @@
 #define SMB_VFS_NEXT_MKNOD(handle, path, mode, dev) \
 	smb_vfs_call_mknod((handle)->next, (path), (mode), (dev))
 
-#define SMB_VFS_REALPATH(conn, path, resolved_path) \
-	smb_vfs_call_realpath((conn)->vfs_handles, (path), (resolved_path))
-#define SMB_VFS_NEXT_REALPATH(handle, path, resolved_path) \
-	smb_vfs_call_realpath((handle)->next, (path), (resolved_path))
+#define SMB_VFS_REALPATH(conn, path) \
+	smb_vfs_call_realpath((conn)->vfs_handles, (path))
+#define SMB_VFS_NEXT_REALPATH(handle, path) \
+	smb_vfs_call_realpath((handle)->next, (path))
 
 #define SMB_VFS_NOTIFY_WATCH(conn, ctx, e, callback, private_data, handle_p) \
 	smb_vfs_call_notify_watch((conn)->vfs_handles, (ctx), (e), (callback), (private_data), (handle_p))
diff --git a/source3/modules/vfs_cap.c b/source3/modules/vfs_cap.c
index 35fa740dd0..89f16891a9 100644
--- a/source3/modules/vfs_cap.c
+++ b/source3/modules/vfs_cap.c
@@ -384,7 +384,7 @@ static int cap_mknod(vfs_handle_struct *handle, const char *path, mode_t mode, S
 	return SMB_VFS_NEXT_MKNOD(handle, cappath, mode, dev);
 }
 
-static char *cap_realpath(vfs_handle_struct *handle, const char *path, char *resolved_path)
+static char *cap_realpath(vfs_handle_struct *handle, const char *path)
 {
         /* monyo need capencode'ed and capdecode'ed? */
 	char *cappath = capencode(talloc_tos(), path);
@@ -393,7 +393,7 @@ static char *cap_realpath(vfs_handle_struct *handle, const char *path, char *res
 		errno = ENOMEM;
 		return NULL;
 	}
-	return SMB_VFS_NEXT_REALPATH(handle, path, resolved_path);
+	return SMB_VFS_NEXT_REALPATH(handle, cappath);
 }
 
 static int cap_chmod_acl(vfs_handle_struct *handle, const char *path, mode_t mode)
diff --git a/source3/modules/vfs_catia.c b/source3/modules/vfs_catia.c
index 177458bce2..af6efd28df 100644
--- a/source3/modules/vfs_catia.c
+++ b/source3/modules/vfs_catia.c
@@ -634,8 +634,7 @@ static int catia_ntimes(vfs_handle_struct *handle,
 }
 
 static char *
-catia_realpath(vfs_handle_struct *handle, const char *path,
-	       char *resolved_path)
+catia_realpath(vfs_handle_struct *handle, const char *path)
 {
 	char *mapped_name = NULL;
 	NTSTATUS status;
@@ -648,7 +647,7 @@ catia_realpath(vfs_handle_struct *handle, const char *path,
 		return NULL;
 	}
 
-	ret = SMB_VFS_NEXT_REALPATH(handle, mapped_name, resolved_path);
+	ret = SMB_VFS_NEXT_REALPATH(handle, mapped_name);
 	TALLOC_FREE(mapped_name);
 
 	return ret;
diff --git a/source3/modules/vfs_default.c b/source3/modules/vfs_default.c
index 6f5b09a5a9..eb0e0b95a6 100644
--- a/source3/modules/vfs_default.c
+++ b/source3/modules/vfs_default.c
@@ -1064,12 +1064,25 @@ static int vfswrap_mknod(vfs_handle_struct *handle,  const char *pathname, mode_
 	return result;
 }
 
-static char *vfswrap_realpath(vfs_handle_struct *handle,  const char *path, char *resolved_path)
+static char *vfswrap_realpath(vfs_handle_struct *handle,  const char *path)
 {
 	char *result;
 
 	START_PROFILE(syscall_realpath);
-	result = realpath(path, resolved_path);
+#ifdef REALPATH_TAKES_NULL
+	result = realpath(path, NULL);
+#else
+	result = SMB_MALLOC_ARRAY(char, PATH_MAX+1);
+	if (result) {
+		char *resolved_path = realpath(path, result);
+		if (!resolved_path) {
+			SAFE_FREE(result);
+		} else {
+			/* SMB_ASSERT(result == resovled_path) ? */
+			result = resolved_path;
+		}
+	}
+#endif
 	END_PROFILE(syscall_realpath);
 	return result;
 }
diff --git a/source3/modules/vfs_full_audit.c b/source3/modules/vfs_full_audit.c
index 23ca1496bf..3328128d86 100644
--- a/source3/modules/vfs_full_audit.c
+++ b/source3/modules/vfs_full_audit.c
@@ -1324,11 +1324,11 @@ static int smb_full_audit_mknod(vfs_handle_struct *handle,
 }
 
 static char *smb_full_audit_realpath(vfs_handle_struct *handle,
-			    const char *path, char *resolved_path)
+			    const char *path)
 {
 	char *result;
 
-	result = SMB_VFS_NEXT_REALPATH(handle, path, resolved_path);
+	result = SMB_VFS_NEXT_REALPATH(handle, path);
 
 	do_log(SMB_VFS_OP_REALPATH, (result != NULL), handle, "%s", path);
 
diff --git a/source3/modules/vfs_onefs_shadow_copy.c b/source3/modules/vfs_onefs_shadow_copy.c
index cf84e58171..bcc40f0d9f 100644
--- a/source3/modules/vfs_onefs_shadow_copy.c
+++ b/source3/modules/vfs_onefs_shadow_copy.c
@@ -471,11 +471,10 @@ onefs_shadow_copy_mknod(vfs_handle_struct *handle, const char *path,
 }
 
 static char *
-onefs_shadow_copy_realpath(vfs_handle_struct *handle, const char *path,
-			   char *resolved_path)
+onefs_shadow_copy_realpath(vfs_handle_struct *handle, const char *path)
 {
 	SHADOW_NEXT(REALPATH,
-		    (handle, cpath ?: path, resolved_path),
+		    (handle, cpath ?: path),
 		    char *);
 }
 
diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
index 502f815235..ba6b3441b8 100644
--- a/source3/modules/vfs_shadow_copy2.c
+++ b/source3/modules/vfs_shadow_copy2.c
@@ -653,7 +653,7 @@ static int shadow_copy2_mknod(vfs_handle_struct *handle,
 }
 
 static char *shadow_copy2_realpath(vfs_handle_struct *handle,
-			    const char *fname, char *resolved_path)
+			    const char *fname)
 {
 	const char *gmt;
 
@@ -671,10 +671,10 @@ static char *shadow_copy2_realpath(vfs_handle_struct *handle,
 		copy[gmt - fname + 1] = '\0';
 
 		DEBUG(10, ("calling NEXT_REALPATH with %s\n", copy));
-		SHADOW2_NEXT(REALPATH, (handle, name, resolved_path), char *,
+		SHADOW2_NEXT(REALPATH, (handle, copy), char *,
 			     NULL);
 	}
-        SHADOW2_NEXT(REALPATH, (handle, name, resolved_path), char *, NULL);
+        SHADOW2_NEXT(REALPATH, (handle, name), char *, NULL);
 }
 
 static const char *shadow_copy2_connectpath(struct vfs_handle_struct *handle,
diff --git a/source3/modules/vfs_time_audit.c b/source3/modules/vfs_time_audit.c
index 84e41753ed..af4fd3313a 100644
--- a/source3/modules/vfs_time_audit.c
+++ b/source3/modules/vfs_time_audit.c
@@ -1066,14 +1066,14 @@ static int smb_time_audit_mknod(vfs_handle_struct *handle,
 }
 
 static char *smb_time_audit_realpath(vfs_handle_struct *handle,
-				     const char *path, char *resolved_path)
+				     const char *path)
 {
 	char *result;
 	struct timespec ts1,ts2;
 	double timediff;
 
 	clock_gettime_mono(&ts1);
-	result = SMB_VFS_NEXT_REALPATH(handle, path, resolved_path);
+	result = SMB_VFS_NEXT_REALPATH(handle, path);
 	clock_gettime_mono(&ts2);
 	timediff = nsec_time_diff(&ts2,&ts1)*1.0e-9;
 
diff --git a/source3/smbd/service.c b/source3/smbd/service.c
index 5b6d9087a3..a58f17c070 100644
--- a/source3/smbd/service.c
+++ b/source3/smbd/service.c
@@ -26,23 +26,14 @@ extern userdom_struct current_user_info;
 
 static bool canonicalize_connect_path(connection_struct *conn)
 {
-#ifdef REALPATH_TAKES_NULL
 	bool ret;
-	char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,NULL);
+	char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath);
 	if (!resolved_name) {
 		return false;
 	}
 	ret = set_conn_connectpath(conn,resolved_name);
 	SAFE_FREE(resolved_name);
 	return ret;
-#else
-        char resolved_name_buf[PATH_MAX+1];
-	char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,resolved_name_buf);
-	if (!resolved_name) {
-		return false;
-	}
-	return set_conn_connectpath(conn,resolved_name);
-#endif /* REALPATH_TAKES_NULL */
 }
 
 /****************************************************************************
diff --git a/source3/smbd/vfs.c b/source3/smbd/vfs.c
index d516456f8d..7042518ce2 100644
--- a/source3/smbd/vfs.c
+++ b/source3/smbd/vfs.c
@@ -841,22 +841,12 @@ char *vfs_GetWd(TALLOC_CTX *ctx, connection_struct *conn)
 
 NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 {
-#ifdef REALPATH_TAKES_NULL
-	bool free_resolved_name = True;
-#else
-        char resolved_name_buf[PATH_MAX+1];
-	bool free_resolved_name = False;
-#endif
 	char *resolved_name = NULL;
 	char *p = NULL;
 
 	DEBUG(3,("check_reduced_name [%s] [%s]\n", fname, conn->connectpath));
 
-#ifdef REALPATH_TAKES_NULL
-	resolved_name = SMB_VFS_REALPATH(conn,fname,NULL);
-#else
-	resolved_name = SMB_VFS_REALPATH(conn,fname,resolved_name_buf);
-#endif
+	resolved_name = SMB_VFS_REALPATH(conn,fname);
 
 	if (!resolved_name) {
 		switch (errno) {
@@ -889,11 +879,7 @@ NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 					}
 				}
 
-#ifdef REALPATH_TAKES_NULL
-				resolved_name = SMB_VFS_REALPATH(conn,tmp_fname,NULL);
-#else
-				resolved_name = SMB_VFS_REALPATH(conn,tmp_fname,resolved_name_buf);
-#endif
+				resolved_name = SMB_VFS_REALPATH(conn,tmp_fname);
 				if (!resolved_name) {
 					NTSTATUS status = map_nt_error_from_unix(errno);
 
@@ -915,7 +901,6 @@ NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 				if (!tmp_fname) {
 					return NT_STATUS_NO_MEMORY;
 				}
-#ifdef REALPATH_TAKES_NULL
 				SAFE_FREE(resolved_name);
 				resolved_name = SMB_STRDUP(tmp_fname);
 				if (!resolved_name) {
@@ -923,10 +908,6 @@ NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 						  "fail for %s\n", tmp_fname));
 					return NT_STATUS_NO_MEMORY;
 				}
-#else
-				safe_strcpy(resolved_name_buf, tmp_fname, PATH_MAX);
-				resolved_name = resolved_name_buf;
-#endif
 				break;
 			}
 			default:
@@ -942,9 +923,7 @@ NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 	if (*resolved_name != '/') {
 		DEBUG(0,("check_reduced_name: realpath doesn't return "
 			 "absolute paths !\n"));
-		if (free_resolved_name) {
-			SAFE_FREE(resolved_name);
-		}
+		SAFE_FREE(resolved_name);
 		return NT_STATUS_OBJECT_NAME_INVALID;
 	}
 
@@ -956,9 +935,7 @@ NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 		    if (conn_rootdir == NULL) {
 			    DEBUG(2, ("check_reduced_name: Could not get "
 				      "conn_rootdir\n"));
-			    if (free_resolved_name) {
-				    SAFE_FREE(resolved_name);
-			    }
+			    SAFE_FREE(resolved_name);
 			    return NT_STATUS_ACCESS_DENIED;
 		    }
 
@@ -967,9 +944,7 @@ NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 			    DEBUG(2, ("check_reduced_name: Bad access "
 				      "attempt: %s is a symlink outside the "
 				      "share path\n", fname));
-			    if (free_resolved_name) {
-				    SAFE_FREE(resolved_name);
-			    }
+			    SAFE_FREE(resolved_name);
 			    return NT_STATUS_ACCESS_DENIED;
 		    }
 	}
@@ -986,17 +961,13 @@ NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 		status = create_synthetic_smb_fname(talloc_tos(), fname, NULL,
 						    NULL, &smb_fname);
 		if (!NT_STATUS_IS_OK(status)) {
-			if (free_resolved_name) {
-				SAFE_FREE(resolved_name);
-			}
+			SAFE_FREE(resolved_name);
                         return status;
 		}
 
 		if ( (SMB_VFS_LSTAT(conn, smb_fname) != -1) &&
                                 (S_ISLNK(smb_fname->st.st_ex_mode)) ) {
-			if (free_resolved_name) {
-				SAFE_FREE(resolved_name);
-			}
+			SAFE_FREE(resolved_name);
                         DEBUG(3,("check_reduced_name: denied: file path name "
 				 "%s is a symlink\n",resolved_name));
 			TALLOC_FREE(smb_fname);
@@ -1008,9 +979,7 @@ NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
 
 	DEBUG(3,("check_reduced_name: %s reduced to %s\n", fname,
 		 resolved_name));
-	if (free_resolved_name) {
-		SAFE_FREE(resolved_name);
-	}
+	SAFE_FREE(resolved_name);
 	return NT_STATUS_OK;
 }
 
@@ -1486,11 +1455,10 @@ int smb_vfs_call_mknod(struct vfs_handle_struct *handle, const char *path,
 	return handle->fns->mknod(handle, path, mode, dev);
 }
 
-char *smb_vfs_call_realpath(struct vfs_handle_struct *handle,
-			    const char *path, char *resolved_path)
+char *smb_vfs_call_realpath(struct vfs_handle_struct *handle, const char *path)
 {
 	VFS_FIND(realpath);
-	return handle->fns->realpath(handle, path, resolved_path);
+	return handle->fns->realpath(handle, path);
 }
 
 NTSTATUS smb_vfs_call_notify_watch(struct vfs_handle_struct *handle,
diff --git a/source3/torture/cmd_vfs.c b/source3/torture/cmd_vfs.c
index cd550a4f48..ea5004ce63 100644
--- a/source3/torture/cmd_vfs.c
+++ b/source3/torture/cmd_vfs.c
@@ -1128,14 +1128,12 @@ static NTSTATUS cmd_mknod(struct vfs_state *vfs, TALLOC_CTX *mem_ctx, int argc,
 
 static NTSTATUS cmd_realpath(struct vfs_state *vfs, TALLOC_CTX *mem_ctx, int argc, const char **argv)
 {
-	char respath[PATH_MAX];
-	
 	if (argc != 2) {
 		printf("Usage: realpath <path>\n");
 		return NT_STATUS_OK;
 	}
 
-	if (SMB_VFS_REALPATH(vfs->conn, argv[1], respath) == NULL) {
+	if (SMB_VFS_REALPATH(vfs->conn, argv[1]) == NULL) {
 		printf("realpath: error=%d (%s)\n", errno, strerror(errno));
 		return NT_STATUS_UNSUCCESSFUL;
 	}