X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=uci.h;h=035c0513d53c21fb9e376444b9f1d6452010b8c6;hb=HEAD;hp=8e73bfe6c33924003e550d7c36556b087700246e;hpb=65e2c3559b451315935f9483c5f4e59d63441e54;p=uci.git

diff --git a/uci.h b/uci.h
index 8e73bfe..035c051 100644
--- a/uci.h
+++ b/uci.h
@@ -15,6 +15,8 @@
 #ifndef __LIBUCI_H
 #define __LIBUCI_H
 
+#include "uci_config.h"
+
 /*
  * you can use these defines to enable debugging behavior for
  * apps compiled against libuci:
@@ -24,18 +26,14 @@
  *
  */
 
-#ifdef DEBUG_ALL
-#define UCI_DEBUG
-#define UCI_DEBUG_TYPECAST
-#endif
-
 #include <stdbool.h>
 #include <setjmp.h>
 #include <stdio.h>
 
 #define UCI_CONFDIR "/etc/config"
 #define UCI_SAVEDIR "/tmp/.uci"
-#define UCI_FILEMODE	0600
+#define UCI_DIRMODE 0700
+#define UCI_FILEMODE 0600
 
 enum
 {
@@ -57,33 +55,26 @@ struct uci_list
 	struct uci_list *prev;
 };
 
+struct uci_ptr;
+struct uci_plugin;
+struct uci_hook_ops;
 struct uci_element;
 struct uci_package;
 struct uci_section;
 struct uci_option;
-struct uci_history;
+struct uci_delta;
 struct uci_context;
+struct uci_backend;
 struct uci_parse_context;
 
 
-/**
- * uci_parse_tuple: Parse an uci tuple
- * @ctx: uci context
- * @str: input string
- * @package: output package pointer
- * @section: output section pointer
- * @option: output option pointer
- * @value: output value pointer
- *
- * format: <package>[.<section>[.<option>]][=<value>]
- */
-extern int uci_parse_tuple(struct uci_context *ctx, char *str, char **package, char **section, char **option, char **value);
-
 /**
  * uci_alloc_context: Allocate a new uci context
  */
 extern struct uci_context *uci_alloc_context(void);
 
+extern struct uci_option *uci_alloc_option(struct uci_section *s, const char *name, const char *value);
+
 /**
  * uci_free_context: Free the uci context including all of its data
  */
@@ -96,6 +87,16 @@ extern void uci_free_context(struct uci_context *ctx);
  */
 extern void uci_perror(struct uci_context *ctx, const char *str);
 
+/**
+ * uci_geterror: Get an error string for the last uci error
+ * @ctx: uci context
+ * @dest: target pointer for the string
+ * @str: prefix for the error message
+ *
+ * Note: string must be freed by the caller
+ */
+extern void uci_get_errorstr(struct uci_context *ctx, char **dest, const char *str);
+
 /**
  * uci_import: Import uci config data from a stream
  * @ctx: uci context
@@ -105,7 +106,7 @@ extern void uci_perror(struct uci_context *ctx, const char *str);
  * @single: ignore the 'package' keyword and parse everything into a single package
  *
  * the name parameter is for config files that don't explicitly use the 'package <...>' keyword
- * if 'package' points to a non-null struct pointer, enable history tracking and merge 
+ * if 'package' points to a non-null struct pointer, enable delta tracking and merge
  */
 extern int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single);
 
@@ -136,75 +137,78 @@ extern int uci_load(struct uci_context *ctx, const char *name, struct uci_packag
 extern int uci_unload(struct uci_context *ctx, struct uci_package *p);
 
 /**
- * uci_cleanup: Clean up after an error
- *
+ * uci_lookup_ptr: Split an uci tuple string and look up an element tree
  * @ctx: uci context
+ * @ptr: lookup result struct
+ * @str: uci tuple string to look up
+ * @extended: allow extended syntax lookup
+ *
+ * if extended is set to true, uci_lookup_ptr supports the following
+ * extended syntax:
+ *
+ * Examples:
+ *   network.@interface[0].ifname ('ifname' option of the first interface section)
+ *   network.@interface[-1]       (last interface section)
+ * Note: uci_lookup_ptr will automatically load a config package if necessary
+ * @str must not be constant, as it will be modified and used for the strings inside @ptr,
+ * thus it must also be available as long as @ptr is in use.
  */
-extern int uci_cleanup(struct uci_context *ctx);
+extern int uci_lookup_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str, bool extended);
 
 /**
- * uci_lookup: Look up an uci element
- *
+ * uci_add_section: Add an unnamed section
  * @ctx: uci context
- * @res: where to store the result
- * @package: uci_package struct 
- * @section: config section (optional)
- * @option: option to search for (optional)
- *
- * If section is omitted, then a pointer to the config package is returned
- * If option is omitted, then a pointer to the config section is returned
+ * @p: package to add the section to
+ * @type: section type
+ * @res: pointer to store a reference to the new section in
  */
-extern int uci_lookup(struct uci_context *ctx, struct uci_element **res, struct uci_package *package, char *section, char *option);
+extern int uci_add_section(struct uci_context *ctx, struct uci_package *p, const char *type, struct uci_section **res);
+
+extern int uci_add_named_section(struct uci_context *ctx, struct uci_package *p, const char *type, const char *name, struct uci_section **res);
 
 /**
- * uci_set_element_value: Replace an element's value with a new one
+ * uci_set: Set an element's value; create the element if necessary
  * @ctx: uci context
- * @element: pointer to an uci_element struct pointer
- * @value: new value
- * 
- * Only valid for uci_option and uci_section. Will replace the type string
- * when used with an uci_section
+ * @ptr: uci pointer
+ *
+ * The updated/created element is stored in ptr->last
  */
-extern int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, char *value);
+extern int uci_set(struct uci_context *ctx, struct uci_ptr *ptr);
 
 /**
- * uci_set: Set an element's value; create the element if necessary
+ * uci_add_list: Append a string to an element list
  * @ctx: uci context
- * @package: package name
- * @section: section name
- * @option: option name
- * @value: value (option) or type (section)
+ * @ptr: uci pointer (with value)
+ *
+ * Note: if the given option already contains a string value,
+ * it will be converted to an 1-element-list before appending the next element
  */
-extern int uci_set(struct uci_context *ctx, struct uci_package *p, char *section, char *option, char *value);
+extern int uci_add_list(struct uci_context *ctx, struct uci_ptr *ptr);
 
 /**
- * uci_rename: Rename an element
+ * uci_reorder: Reposition a section
  * @ctx: uci context
- * @package: package name
- * @section: section name
- * @option: option name
- * @name: new name
+ * @s: uci section to reposition
+ * @pos: new position in the section list
  */
-extern int uci_rename(struct uci_context *ctx, struct uci_package *p, char *section, char *option, char *name);
+extern int uci_reorder_section(struct uci_context *ctx, struct uci_section *s, int pos);
 
 /**
- * uci_delete_element: Delete a section or option
+ * uci_rename: Rename an element
  * @ctx: uci context
- * @e: element (section or option)
+ * @ptr: uci pointer (with value)
  */
-extern int uci_delete_element(struct uci_context *ctx, struct uci_element *e);
+extern int uci_rename(struct uci_context *ctx, struct uci_ptr *ptr);
 
 /**
  * uci_delete: Delete a section or option
  * @ctx: uci context
- * @p: uci package
- * @section: section name
- * @option: option name (optional)
+ * @ptr: uci pointer
  */
-extern int uci_delete(struct uci_context *ctx, struct uci_package *p, char *section, char *option);
+extern int uci_delete(struct uci_context *ctx, struct uci_ptr *ptr);
 
 /**
- * uci_save: save change history for a package
+ * uci_save: save change delta for a package
  * @ctx: uci context
  * @p: uci_package struct
  */
@@ -214,7 +218,7 @@ extern int uci_save(struct uci_context *ctx, struct uci_package *p);
  * uci_commit: commit changes to a package
  * @ctx: uci context
  * @p: uci_package struct pointer
- * @overwrite: overwrite existing config data and flush history
+ * @overwrite: overwrite existing config data and flush delta
  *
  * committing may reload the whole uci_package data,
  * the supplied pointer is updated accordingly
@@ -224,17 +228,19 @@ extern int uci_commit(struct uci_context *ctx, struct uci_package **p, bool over
 /**
  * uci_list_configs: List available uci config files
  * @ctx: uci context
+ *
+ * caller is responsible for freeing the allocated memory behind list
  */
 extern int uci_list_configs(struct uci_context *ctx, char ***list);
 
-/** 
- * uci_set_savedir: override the default history save directory
+/**
+ * uci_set_savedir: override the default delta save directory
  * @ctx: uci context
  * @dir: directory name
  */
 extern int uci_set_savedir(struct uci_context *ctx, const char *dir);
 
-/** 
+/**
  * uci_set_savedir: override the default config storage directory
  * @ctx: uci context
  * @dir: directory name
@@ -242,37 +248,131 @@ extern int uci_set_savedir(struct uci_context *ctx, const char *dir);
 extern int uci_set_confdir(struct uci_context *ctx, const char *dir);
 
 /**
- * uci_add_history_path: add a directory to the search path for change history files
+ * uci_add_delta_path: add a directory to the search path for change delta files
  * @ctx: uci context
  * @dir: directory name
  *
  * This function allows you to add directories, which contain 'overlays'
  * for the active config, that will never be committed.
  */
-extern int uci_add_history_path(struct uci_context *ctx, const char *dir);
+extern int uci_add_delta_path(struct uci_context *ctx, const char *dir);
 
 /**
  * uci_revert: revert all changes to a config item
  * @ctx: uci context
- * @p: pointer to a uci_package struct ptr (will be replaced by the revert)
- * @section: section name (optional)
- * @option option name (optional)
+ * @ptr: uci pointer
+ */
+extern int uci_revert(struct uci_context *ctx, struct uci_ptr *ptr);
+
+/**
+ * uci_parse_argument: parse a shell-style argument, with an arbitrary quoting style
+ * @ctx: uci context
+ * @stream: input stream
+ * @str: pointer to the current line (use NULL for parsing the next line)
+ * @result: pointer for the result
+ */
+extern int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result);
+
+/**
+ * uci_set_backend: change the default backend
+ * @ctx: uci context
+ * @name: name of the backend
+ *
+ * The default backend is "file", which uses /etc/config for config storage
+ */
+extern int uci_set_backend(struct uci_context *ctx, const char *name);
+
+/**
+ * uci_validate_text: validate a value string for uci options
+ * @str: value
+ *
+ * this function checks whether a given string is acceptable as value
+ * for uci options
+ */
+extern bool uci_validate_text(const char *str);
+
+
+/**
+ * uci_add_hook: add a uci hook
+ * @ctx: uci context
+ * @ops: uci hook ops
+ *
+ * NB: allocated and freed by the caller
+ */
+extern int uci_add_hook(struct uci_context *ctx, const struct uci_hook_ops *ops);
+
+/**
+ * uci_remove_hook: remove a uci hook
+ * @ctx: uci context
+ * @ops: uci hook ops
+ */
+extern int uci_remove_hook(struct uci_context *ctx, const struct uci_hook_ops *ops);
+
+/**
+ * uci_load_plugin: load an uci plugin
+ * @ctx: uci context
+ * @filename: path to the uci plugin
+ *
+ * NB: plugin will be unloaded automatically when the context is freed
+ */
+int uci_load_plugin(struct uci_context *ctx, const char *filename);
+
+/**
+ * uci_load_plugins: load all uci plugins from a directory
+ * @ctx: uci context
+ * @pattern: pattern of uci plugin files (optional)
+ *
+ * if pattern is NULL, then uci_load_plugins will call uci_load_plugin
+ * for uci_*.so in <prefix>/lib/
+ */
+int uci_load_plugins(struct uci_context *ctx, const char *pattern);
+
+/**
+ * uci_parse_ptr: parse a uci string into a uci_ptr
+ * @ctx: uci context
+ * @ptr: target data structure
+ * @str: string to parse
+ *
+ * str is modified by this function
+ */
+int uci_parse_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str);
+
+/**
+ * uci_lookup_next: lookup a child element
+ * @ctx: uci context
+ * @e: target element pointer
+ * @list: list of elements
+ * @name: name of the child element
+ *
+ * if parent is NULL, the function looks up the package with the given name
  */
-extern int uci_revert(struct uci_context *ctx, struct uci_package **p, char *section, char *option);
+int uci_lookup_next(struct uci_context *ctx, struct uci_element **e, struct uci_list *list, const char *name);
+
 
 /* UCI data structures */
 enum uci_type {
-	UCI_TYPE_HISTORY = 0,
-	UCI_TYPE_PACKAGE = 1,
-	UCI_TYPE_SECTION = 2,
-	UCI_TYPE_OPTION = 3,
-	UCI_TYPE_PATH = 4
+	UCI_TYPE_UNSPEC = 0,
+	UCI_TYPE_DELTA = 1,
+	UCI_TYPE_PACKAGE = 2,
+	UCI_TYPE_SECTION = 3,
+	UCI_TYPE_OPTION = 4,
+	UCI_TYPE_PATH = 5,
+	UCI_TYPE_BACKEND = 6,
+	UCI_TYPE_ITEM = 7,
+	UCI_TYPE_HOOK = 8,
+	UCI_TYPE_PLUGIN = 9,
+};
+
+enum uci_option_type {
+	UCI_TYPE_STRING = 0,
+	UCI_TYPE_LIST = 1,
 };
 
 enum uci_flags {
-	UCI_FLAG_STRICT =      (1 << 0), /* strict mode for the parser */
-	UCI_FLAG_PERROR =      (1 << 1), /* print parser error messages */
-	UCI_FLAG_EXPORT_NAME = (1 << 2), /* when exporting, name unnamed sections */
+	UCI_FLAG_STRICT =        (1 << 0), /* strict mode for the parser */
+	UCI_FLAG_PERROR =        (1 << 1), /* print parser error messages */
+	UCI_FLAG_EXPORT_NAME =   (1 << 2), /* when exporting, name unnamed sections */
+	UCI_FLAG_SAVED_DELTA = (1 << 3), /* store the saved delta in memory as well */
 };
 
 struct uci_element
@@ -282,6 +382,18 @@ struct uci_element
 	char *name;
 };
 
+struct uci_backend
+{
+	struct uci_element e;
+	char **(*list_configs)(struct uci_context *ctx);
+	struct uci_package *(*load)(struct uci_context *ctx, const char *name);
+	void (*commit)(struct uci_context *ctx, struct uci_package **p, bool overwrite);
+
+	/* private: */
+	const void *ptr;
+	void *priv;
+};
+
 struct uci_context
 {
 	/* list of config packages */
@@ -290,39 +402,29 @@ struct uci_context
 	/* parser context, use for error handling only */
 	struct uci_parse_context *pctx;
 
+	/* backend for import and export */
+	struct uci_backend *backend;
+	struct uci_list backends;
+
 	/* uci runtime flags */
 	enum uci_flags flags;
 
 	char *confdir;
 	char *savedir;
 
-	/* search path for history files */
-	struct uci_list history_path;
+	/* search path for delta files */
+	struct uci_list delta_path;
 
 	/* private: */
-	int errno;
+	int err;
 	const char *func;
 	jmp_buf trap;
-	bool internal;
+	bool internal, nested;
 	char *buf;
 	int bufsz;
-};
-
-struct uci_parse_context
-{
-	/* error context */
-	const char *reason;
-	int line;
-	int byte;
 
-	/* private: */
-	struct uci_package *package;
-	struct uci_section *section;
-	bool merge;
-	FILE *file;
-	const char *name;
-	char *buf;
-	int bufsz;
+	struct uci_list hooks;
+	struct uci_list plugins;
 };
 
 struct uci_package
@@ -330,12 +432,15 @@ struct uci_package
 	struct uci_element e;
 	struct uci_list sections;
 	struct uci_context *ctx;
-	bool confdir;
+	bool has_delta;
 	char *path;
 
 	/* private: */
+	struct uci_backend *backend;
+	void *priv;
 	int n_section;
-	struct uci_list history;
+	struct uci_list delta;
+	struct uci_list saved_delta;
 };
 
 struct uci_section
@@ -351,17 +456,23 @@ struct uci_option
 {
 	struct uci_element e;
 	struct uci_section *section;
-	char *value;
+	enum uci_option_type type;
+	union {
+		struct uci_list list;
+		char *string;
+	} v;
 };
 
 enum uci_command {
 	UCI_CMD_ADD,
 	UCI_CMD_REMOVE,
 	UCI_CMD_CHANGE,
-	UCI_CMD_RENAME
+	UCI_CMD_RENAME,
+	UCI_CMD_REORDER,
+	UCI_CMD_LIST_ADD,
 };
 
-struct uci_history
+struct uci_delta
 {
 	struct uci_element e;
 	enum uci_command cmd;
@@ -369,6 +480,52 @@ struct uci_history
 	char *value;
 };
 
+struct uci_ptr
+{
+	enum uci_type target;
+	enum {
+		UCI_LOOKUP_DONE =     (1 << 0),
+		UCI_LOOKUP_COMPLETE = (1 << 1),
+		UCI_LOOKUP_EXTENDED = (1 << 2),
+	} flags;
+
+	struct uci_package *p;
+	struct uci_section *s;
+	struct uci_option *o;
+	struct uci_element *last;
+
+	const char *package;
+	const char *section;
+	const char *option;
+	const char *value;
+};
+
+struct uci_hook_ops
+{
+	void (*load)(const struct uci_hook_ops *ops, struct uci_package *p);
+	void (*set)(const struct uci_hook_ops *ops, struct uci_package *p, struct uci_delta *e);
+};
+
+struct uci_hook
+{
+	struct uci_element e;
+	const struct uci_hook_ops *ops;
+};
+
+struct uci_plugin_ops
+{
+	int (*attach)(struct uci_context *ctx);
+	void (*detach)(struct uci_context *ctx);
+};
+
+struct uci_plugin
+{
+	struct uci_element e;
+	const struct uci_plugin_ops *ops;
+	void *dlh;
+};
+
+
 /* linked list handling */
 #ifndef offsetof
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
@@ -380,8 +537,10 @@ struct uci_history
  * @type:   the type of the container struct this is embedded in.
  * @member: the name of the member within the struct.
  */
+#ifndef container_of
 #define container_of(ptr, type, member) \
 	((type *) ((char *)ptr - offsetof(type,member)))
+#endif
 
 
 /**
@@ -389,9 +548,6 @@ struct uci_history
  * @_type: config, section or option
  * @_ptr: pointer to the uci_list struct
  */
-#define element_to(type, ptr) \
-	container_of(ptr, struct uci_ ## type, e)
-
 #define list_to_element(ptr) \
 	container_of(ptr, struct uci_element, list)
 
@@ -434,18 +590,24 @@ struct uci_history
 #define uci_list_empty(list) ((list)->next == (list))
 
 /* wrappers for dynamic type handling */
-#define uci_type_history UCI_TYPE_HISTORY
+#define uci_type_backend UCI_TYPE_BACKEND
+#define uci_type_delta UCI_TYPE_DELTA
 #define uci_type_package UCI_TYPE_PACKAGE
 #define uci_type_section UCI_TYPE_SECTION
 #define uci_type_option UCI_TYPE_OPTION
+#define uci_type_hook UCI_TYPE_HOOK
+#define uci_type_plugin UCI_TYPE_PLUGIN
 
 /* element typecasting */
 #ifdef UCI_DEBUG_TYPECAST
 static const char *uci_typestr[] = {
-	[uci_type_history] = "history",
+	[uci_type_backend] = "backend",
+	[uci_type_delta] = "delta",
 	[uci_type_package] = "package",
 	[uci_type_section] = "section",
 	[uci_type_option] = "option",
+	[uci_type_hook] = "hook",
+	[uci_type_plugin] = "plugin",
 };
 
 static void uci_typecast_error(int from, int to)
@@ -462,16 +624,22 @@ static void uci_typecast_error(int from, int to)
 		return (struct uci_ ## _type *) e; \
 	}
 
-BUILD_CAST(history)
+BUILD_CAST(backend)
+BUILD_CAST(delta)
 BUILD_CAST(package)
 BUILD_CAST(section)
 BUILD_CAST(option)
+BUILD_CAST(hook)
+BUILD_CAST(plugin)
 
 #else
-#define uci_to_history(ptr) container_of(ptr, struct uci_history, e)
+#define uci_to_backend(ptr) container_of(ptr, struct uci_backend, e)
+#define uci_to_delta(ptr) container_of(ptr, struct uci_delta, e)
 #define uci_to_package(ptr) container_of(ptr, struct uci_package, e)
 #define uci_to_section(ptr) container_of(ptr, struct uci_section, e)
 #define uci_to_option(ptr)  container_of(ptr, struct uci_option, e)
+#define uci_to_hook(ptr)    container_of(ptr, struct uci_hook, e)
+#define uci_to_plugin(ptr)  container_of(ptr, struct uci_plugin, e)
 #endif
 
 /**
@@ -487,4 +655,63 @@ BUILD_CAST(option)
 #define uci_dataptr(ptr) \
 	(((char *) ptr) + sizeof(*ptr))
 
+/**
+ * uci_lookup_package: look up a package
+ * @ctx: uci context
+ * @name: name of the package
+ */
+static inline struct uci_package *
+uci_lookup_package(struct uci_context *ctx, const char *name)
+{
+	struct uci_element *e = NULL;
+	if (uci_lookup_next(ctx, &e, &ctx->root, name) == 0)
+		return uci_to_package(e);
+	else
+		return NULL;
+}
+
+/**
+ * uci_lookup_section: look up a section
+ * @ctx: uci context
+ * @p: package that the section belongs to
+ * @name: name of the section
+ */
+static inline struct uci_section *
+uci_lookup_section(struct uci_context *ctx, struct uci_package *p, const char *name)
+{
+	struct uci_element *e = NULL;
+	if (uci_lookup_next(ctx, &e, &p->sections, name) == 0)
+		return uci_to_section(e);
+	else
+		return NULL;
+}
+
+/**
+ * uci_lookup_option: look up an option
+ * @ctx: uci context
+ * @section: section that the option belongs to
+ * @name: name of the option
+ */
+static inline struct uci_option *
+uci_lookup_option(struct uci_context *ctx, struct uci_section *s, const char *name)
+{
+	struct uci_element *e = NULL;
+	if (uci_lookup_next(ctx, &e, &s->options, name) == 0)
+		return uci_to_option(e);
+	else
+		return NULL;
+}
+
+static inline const char *
+uci_lookup_option_string(struct uci_context *ctx, struct uci_section *s, const char *name)
+{
+	struct uci_option *o;
+
+	o = uci_lookup_option(ctx, s, name);
+	if (!o || o->type != UCI_TYPE_STRING)
+		return NULL;
+
+	return o->v.string;
+}
+
 #endif