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asterisk/include/asterisk/config.h

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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
* \brief Configuration File Parser
*/
#ifndef _ASTERISK_CONFIG_H
#define _ASTERISK_CONFIG_H
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
#include "asterisk/utils.h"
#include "asterisk/inline_api.h"
struct ast_config;
struct ast_category;
/*! Options for ast_config_load()
*/
enum {
/*! Load the configuration, including comments */
CONFIG_FLAG_WITHCOMMENTS = (1 << 0),
/*! On a reload, give us a -1 if the file hasn't changed. */
CONFIG_FLAG_FILEUNCHANGED = (1 << 1),
/*! Don't attempt to cache mtime on this config file. */
CONFIG_FLAG_NOCACHE = (1 << 2),
/*! Don't attempt to load from realtime (typically called from a realtime driver dependency) */
CONFIG_FLAG_NOREALTIME = (1 << 3),
};
#define CONFIG_STATUS_FILEMISSING (void *)0
#define CONFIG_STATUS_FILEUNCHANGED (void *)-1
#define CONFIG_STATUS_FILEINVALID (void *)-2
/*!
* \brief Types used in ast_realtime_require_field
*/
typedef enum {
RQ_INTEGER1,
RQ_UINTEGER1,
RQ_INTEGER2,
RQ_UINTEGER2,
RQ_INTEGER3,
RQ_UINTEGER3,
RQ_INTEGER4,
RQ_UINTEGER4,
RQ_INTEGER8,
RQ_UINTEGER8,
RQ_CHAR,
RQ_FLOAT,
RQ_DATE,
RQ_DATETIME,
} require_type;
/*! \brief Structure for variables, used for configurations and for channel variables */
struct ast_variable {
const char *name;
const char *value;
struct ast_variable *next;
char *file;
int lineno;
int object; /*!< 0 for variable, 1 for object */
int blanklines; /*!< Number of blanklines following entry */
struct ast_comment *precomments;
struct ast_comment *sameline;
struct ast_comment *trailing; /*!< the last object in the list will get assigned any trailing comments when EOF is hit */
char stuff[0];
};
typedef struct ast_config *config_load_func(const char *database, const char *table, const char *configfile, struct ast_config *config, struct ast_flags flags, const char *suggested_include_file, const char *who_asked);
typedef struct ast_variable *realtime_var_get(const char *database, const char *table, va_list ap);
typedef struct ast_config *realtime_multi_get(const char *database, const char *table, va_list ap);
typedef int realtime_update(const char *database, const char *table, const char *keyfield, const char *entity, va_list ap);
typedef int realtime_update2(const char *database, const char *table, va_list ap);
typedef int realtime_store(const char *database, const char *table, va_list ap);
typedef int realtime_destroy(const char *database, const char *table, const char *keyfield, const char *entity, va_list ap);
/*!
* \brief Function pointer called to ensure database schema is properly configured for realtime use
* \since 1.6.1
*/
typedef int realtime_require(const char *database, const char *table, va_list ap);
/*!
* \brief Function pointer called to clear the database cache and free resources used for such
* \since 1.6.1
*/
typedef int realtime_unload(const char *database, const char *table);
/*! \brief Configuration engine structure, used to define realtime drivers */
struct ast_config_engine {
char *name;
config_load_func *load_func;
realtime_var_get *realtime_func;
realtime_multi_get *realtime_multi_func;
realtime_update *update_func;
realtime_update2 *update2_func;
realtime_store *store_func;
realtime_destroy *destroy_func;
realtime_require *require_func;
realtime_unload *unload_func;
struct ast_config_engine *next;
};
/*!
* \brief Load a config file
*
* \param filename path of file to open. If no preceding '/' character,
* path is considered relative to AST_CONFIG_DIR
* \param who_asked The module which is making this request.
* \param flags Optional flags:
* CONFIG_FLAG_WITHCOMMENTS - load the file with comments intact;
* CONFIG_FLAG_FILEUNCHANGED - check the file mtime and return CONFIG_STATUS_FILEUNCHANGED if the mtime is the same; or
* CONFIG_FLAG_NOCACHE - don't cache file mtime (main purpose of this option is to save memory on temporary files).
*
* \details
* Create a config structure from a given configuration file.
*
* \return an ast_config data structure on success
* \retval NULL on error
*/
struct ast_config *ast_config_load2(const char *filename, const char *who_asked, struct ast_flags flags);
/*!
* \brief Load a config file
*
* \param filename path of file to open. If no preceding '/' character,
* path is considered relative to AST_CONFIG_DIR
* \param flags Optional flags:
* CONFIG_FLAG_WITHCOMMENTS - load the file with comments intact;
* CONFIG_FLAG_FILEUNCHANGED - check the file mtime and return CONFIG_STATUS_FILEUNCHANGED if the mtime is the same; or
* CONFIG_FLAG_NOCACHE - don't cache file mtime (main purpose of this option is to save memory on temporary files).
*
* \details
* Create a config structure from a given configuration file.
*
* \return an ast_config data structure on success
* \retval NULL on error
*/
#define ast_config_load(filename, flags) ast_config_load2(filename, AST_MODULE, flags)
/*!
* \brief Destroys a config
*
* \param config pointer to config data structure
*
* \details
* Free memory associated with a given config
*/
void ast_config_destroy(struct ast_config *config);
/*!
* \brief returns the root ast_variable of a config
*
* \param config pointer to an ast_config data structure
* \param cat name of the category for which you want the root
*
* \return the category specified
*/
struct ast_variable *ast_category_root(struct ast_config *config, char *cat);
/*!
* \brief Goes through categories
*
* \param config Which config structure you wish to "browse"
* \param prev A pointer to a previous category.
*
* \details
* This function is kind of non-intuitive in it's use.
* To begin, one passes NULL as the second argument.
* It will return a pointer to the string of the first category in the file.
* From here on after, one must then pass the previous usage's return value
* as the second pointer, and it will return a pointer to the category name
* afterwards.
*
* \retval a category on success
* \retval NULL on failure/no-more-categories
*/
char *ast_category_browse(struct ast_config *config, const char *prev);
/*!
* \brief Goes through variables
*
* \details
* Somewhat similar in intent as the ast_category_browse.
* List variables of config file category
*
* \retval ast_variable list on success
* \retval NULL on failure
*/
struct ast_variable *ast_variable_browse(const struct ast_config *config, const char *category);
/*!
* \brief given a pointer to a category, return the root variable.
*
* \details
* This is equivalent to ast_variable_browse(), but more efficient if we
* already have the struct ast_category * (e.g. from ast_category_get())
*/
struct ast_variable *ast_category_first(struct ast_category *cat);
/*!
* \brief Gets a variable
*
* \param config which (opened) config to use
* \param category category under which the variable lies
* \param variable which variable you wish to get the data for
*
* \details
* Goes through a given config file in the given category and searches for the given variable
*
* \retval The variable value on success
* \retval NULL if unable to find it.
*/
const char *ast_variable_retrieve(const struct ast_config *config, const char *category, const char *variable);
/*!
* \brief Retrieve a category if it exists
*
* \param config which config to use
* \param category_name name of the category you're looking for
*
* \details
* This will search through the categories within a given config file for a match.
*
* \retval pointer to category if found
* \retval NULL if not.
*/
struct ast_category *ast_category_get(const struct ast_config *config, const char *category_name);
/*!
* \brief Check for category duplicates
*
* \param config which config to use
* \param category_name name of the category you're looking for
*
* \details
* This will search through the categories within a given config file for a match.
*
* \return non-zero if found
*/
int ast_category_exist(const struct ast_config *config, const char *category_name);
/*!
* \brief Retrieve realtime configuration
*
* \param family which family/config to lookup
*
* \details
* This will use builtin configuration backends to look up a particular
* entity in realtime and return a variable list of its parameters.
*
* \note
* Unlike the variables in ast_config, the resulting list of variables
* MUST be freed with ast_variables_destroy() as there is no container.
*
* \note
* The difference between these two calls is that ast_load_realtime excludes
* fields whose values are NULL, while ast_load_realtime_all loads all columns.
*
* \note
* You should use the constant SENTINEL to terminate arguments, in
* order to preserve cross-platform compatibility.
*/
struct ast_variable *ast_load_realtime(const char *family, ...) attribute_sentinel;
struct ast_variable *ast_load_realtime_all(const char *family, ...) attribute_sentinel;
/*!
* \brief Release any resources cached for a realtime family
* \since 1.6.1
*
* \param family which family/config to destroy
*
* \details
* Various backends may cache attributes about a realtime data storage
* facility; on reload, a front end resource may request to purge that cache.
*
* \retval 0 If any cache was purged
* \retval -1 If no cache was found
*/
int ast_unload_realtime(const char *family);
/*!
* \brief Inform realtime what fields that may be stored
* \since 1.6.1
*
* \param family which family/config is referenced
*
* \details
* This will inform builtin configuration backends that particular fields
* may be updated during the use of that configuration section. This is
* mainly to be used during startup routines, to ensure that various fields
* exist in the backend. The backends may take various actions, such as
* creating new fields in the data store or warning the administrator that
* new fields may need to be created, in order to ensure proper function.
*
* The arguments are specified in groups of 3: column name, column type,
* and column size. The column types are specified as integer constants,
* defined by the enum require_type. Note that the size is specified as
* the number of equivalent character fields that a field may take up, even
* if a field is otherwise specified as an integer type. This is due to
* the fact that some fields have historically been specified as character
* types, even if they contained integer values.
*
* A family should always specify its fields to the minimum necessary
* requirements to fulfill all possible values (within reason; for example,
* a timeout value may reasonably be specified as an INTEGER2, with size 5.
* Even though values above 32767 seconds are possible, they are unlikely
* to be useful, and we should not complain about that size).
*
* \retval 0 Required fields met specified standards
* \retval -1 One or more fields was missing or insufficient
*
* \note You should use the constant SENTINEL to terminate arguments, in
* order to preserve cross-platform compatibility.
*/
int ast_realtime_require_field(const char *family, ...) attribute_sentinel;
/*!
* \brief Retrieve realtime configuration
*
* \param family which family/config to lookup
*
* \details
* This will use builtin configuration backends to look up a particular
* entity in realtime and return a variable list of its parameters. Unlike
* the ast_load_realtime, this function can return more than one entry and
* is thus stored inside a traditional ast_config structure rather than
* just returning a linked list of variables.
*
* \note You should use the constant SENTINEL to terminate arguments, in
* order to preserve cross-platform compatibility.
*/
struct ast_config *ast_load_realtime_multientry(const char *family, ...) attribute_sentinel;
/*!
* \brief Update realtime configuration
*
* \param family which family/config to be updated
* \param keyfield which field to use as the key
* \param lookup which value to look for in the key field to match the entry.
*
* \details
* This function is used to update a parameter in realtime configuration space.
*
* \return Number of rows affected, or -1 on error.
*
* \note You should use the constant SENTINEL to terminate arguments, in
* order to preserve cross-platform compatibility.
*/
int ast_update_realtime(const char *family, const char *keyfield, const char *lookup, ...) attribute_sentinel;
/*!
* \brief Update realtime configuration
*
* \param family which family/config to be updated
*
* \details
* This function is used to update a parameter in realtime configuration space.
* It includes the ability to lookup a row based upon multiple key criteria.
* As a result, this function includes two sentinel values, one to terminate
* lookup values and the other to terminate the listing of fields to update.
*
* \return Number of rows affected, or -1 on error.
*
* \note You should use the constant SENTINEL to terminate arguments, in
* order to preserve cross-platform compatibility.
*/
int ast_update2_realtime(const char *family, ...) attribute_sentinel;
/*!
* \brief Create realtime configuration
*
* \param family which family/config to be created
*
* \details
* This function is used to create a parameter in realtime configuration space.
*
* \return Number of rows affected, or -1 on error.
*
* \note
* On the MySQL engine only, for reasons of backwards compatibility, the return
* value is the insert ID. This value is nonportable and may be changed in a
* future version to match the other engines.
*
* \note You should use the constant SENTINEL to terminate arguments, in
* order to preserve cross-platform compatibility.
*/
int ast_store_realtime(const char *family, ...) attribute_sentinel;
/*!
* \brief Destroy realtime configuration
*
* \param family which family/config to be destroyed
* \param keyfield which field to use as the key
* \param lookup which value to look for in the key field to match the entry.
*
* \details
* This function is used to destroy an entry in realtime configuration space.
* Additional params are used as keys.
*
* \return Number of rows affected, or -1 on error.
*
* \note You should use the constant SENTINEL to terminate arguments, in
* order to preserve cross-platform compatibility.
*/
int ast_destroy_realtime(const char *family, const char *keyfield, const char *lookup, ...) attribute_sentinel;
/*!
* \brief Check if realtime engine is configured for family
* \param family which family/config to be checked
* \return 1 if family is configured in realtime and engine exists
*/
int ast_check_realtime(const char *family);
/*! \brief Check if there's any realtime engines loaded */
int ast_realtime_enabled(void);
/*!
* \brief Free variable list
* \param var the linked list of variables to free
*
* \details
* This function frees a list of variables.
*/
void ast_variables_destroy(struct ast_variable *var);
/*!
* \brief Register config engine
* \retval 1 Always
*/
int ast_config_engine_register(struct ast_config_engine *newconfig);
/*!
* \brief Deregister config engine
* \retval 0 Always
*/
int ast_config_engine_deregister(struct ast_config_engine *del);
/*!
* \brief Exposed initialization method for core process
*
* \details
* This method is intended for use only with the core initialization and is
* not designed to be called from any user applications.
*/
int register_config_cli(void);
/*!
* \brief Exposed re-initialization method for core process
*
* \details
* This method is intended for use only with the core re-initialization and is
* not designed to be called from any user applications.
*/
int read_config_maps(void);
/*! \brief Create a new base configuration structure */
struct ast_config *ast_config_new(void);
/*!
* \brief Retrieve the current category name being built.
*
* \details
* API for backend configuration engines while building a configuration set.
*/
struct ast_category *ast_config_get_current_category(const struct ast_config *cfg);
/*!
* \brief Set the category within the configuration as being current.
*
* \details
* API for backend configuration engines while building a configuration set.
*/
void ast_config_set_current_category(struct ast_config *cfg, const struct ast_category *cat);
/*!
* \brief Retrieve a configuration variable within the configuration set.
*
* \details
* Retrieves the named variable \p var within category \p cat of configuration
* set \p cfg. If not found, attempts to retrieve the named variable \p var
* from within category \em general.
*
* \return Value of \p var, or NULL if not found.
*/
const char *ast_config_option(struct ast_config *cfg, const char *cat, const char *var);
/*! \brief Create a category structure */
struct ast_category *ast_category_new(const char *name, const char *in_file, int lineno);
void ast_category_append(struct ast_config *config, struct ast_category *cat);
/*!
* \brief Inserts new category
*
* \param config which config to use
* \param cat newly created category to insert
* \param match which category to insert above
*
* \details
* This function is used to insert a new category above another category
* matching the match parameter.
*/
void ast_category_insert(struct ast_config *config, struct ast_category *cat, const char *match);
int ast_category_delete(struct ast_config *cfg, const char *category);
/*!
* \brief Removes and destroys all variables within a category
* \retval 0 if the category was found and emptied
* \retval -1 if the category was not found
*/
int ast_category_empty(struct ast_config *cfg, const char *category);
void ast_category_destroy(struct ast_category *cat);
struct ast_variable *ast_category_detach_variables(struct ast_category *cat);
void ast_category_rename(struct ast_category *cat, const char *name);
#ifdef MALLOC_DEBUG
struct ast_variable *_ast_variable_new(const char *name, const char *value, const char *filename, const char *file, const char *function, int lineno);
#define ast_variable_new(a, b, c) _ast_variable_new(a, b, c, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#else
struct ast_variable *ast_variable_new(const char *name, const char *value, const char *filename);
#endif
struct ast_config_include *ast_include_new(struct ast_config *conf, const char *from_file, const char *included_file, int is_exec, const char *exec_file, int from_lineno, char *real_included_file_name, int real_included_file_name_size);
struct ast_config_include *ast_include_find(struct ast_config *conf, const char *included_file);
void ast_include_rename(struct ast_config *conf, const char *from_file, const char *to_file);
void ast_variable_append(struct ast_category *category, struct ast_variable *variable);
void ast_variable_insert(struct ast_category *category, struct ast_variable *variable, const char *line);
int ast_variable_delete(struct ast_category *category, const char *variable, const char *match, const char *line);
/*!
* \brief Update variable value within a config
*
* \param category Category element within the config
* \param variable Name of the variable to change
* \param value New value of the variable
* \param match If set, previous value of the variable (if NULL or zero-length, no matching will be done)
* \param object Boolean of whether to make the new variable an object
*
* \return 0 on success or -1 on failure.
*/
int ast_variable_update(struct ast_category *category, const char *variable,
const char *value, const char *match, unsigned int object);
int ast_config_text_file_save(const char *filename, const struct ast_config *cfg, const char *generator);
int config_text_file_save(const char *filename, const struct ast_config *cfg, const char *generator) __attribute__((deprecated));
struct ast_config *ast_config_internal_load(const char *configfile, struct ast_config *cfg, struct ast_flags flags, const char *suggested_incl_file, const char *who_asked);
/*!
* \brief Support code to parse config file arguments
*
* \details
* The function ast_parse_arg() provides a generic interface to parse
* strings (e.g. numbers, network addresses and so on) in a flexible
* way, e.g. by doing proper error and bound checks, provide default
* values, and so on.
* The function (described later) takes a string as an argument,
* a set of flags to specify the result format and checks to perform,
* a pointer to the result, and optionally some additional arguments.
*
* \return It returns 0 on success, != 0 otherwise.
*/
enum ast_parse_flags {
/* low 4 bits of flags are used for the operand type */
PARSE_TYPE = 0x000f,
/* numeric types, with optional default value and bound checks.
* Additional arguments are passed by value.
*/
PARSE_INT32 = 0x0001,
PARSE_UINT32 = 0x0002,
PARSE_DOUBLE = 0x0003,
#if 0 /* not supported yet */
PARSE_INT16 = 0x0004,
PARSE_UINT16 = 0x0005,
#endif
/* Returns a struct ast_sockaddr, with optional default value
* (passed by reference) and port handling (accept, ignore,
* require, forbid). The format is 'ipaddress[:port]'. IPv6 address
* literals need square brackets around them if a port is specified.
*/
PARSE_ADDR = 0x000e,
/* Returns a struct sockaddr_in, with optional default value
* (passed by reference) and port handling (accept, ignore,
* require, forbid). The format is 'host.name[:port]'
*/
PARSE_INADDR = 0x000f,
/* Other data types can be added as needed */
/* If PARSE_DEFAULT is set, next argument is a default value
* which is returned in case of error. The argument is passed
* by value in case of numeric types, by reference in other cases.
*/
PARSE_DEFAULT = 0x0010, /* assign default on error */
/* Request a range check, applicable to numbers. Two additional
* arguments are passed by value, specifying the low-high end of
* the range (inclusive). An error is returned if the value
* is outside or inside the range, respectively.
*/
PARSE_IN_RANGE = 0x0020, /* accept values inside a range */
PARSE_OUT_RANGE = 0x0040, /* accept values outside a range */
/* Port handling, for ast_sockaddr. accept/ignore/require/forbid
* port number after the hostname or address.
*/
PARSE_PORT_MASK = 0x0300, /* 0x000: accept port if present */
PARSE_PORT_IGNORE = 0x0100, /* 0x100: ignore port if present */
PARSE_PORT_REQUIRE = 0x0200, /* 0x200: require port number */
PARSE_PORT_FORBID = 0x0300, /* 0x100: forbid port number */
};
/*!
* \brief The argument parsing routine.
*
* \param arg the string to parse. It is not modified.
* \param flags combination of ast_parse_flags to specify the
* return type and additional checks.
* \param result pointer to the result. NULL is valid here, and can
* be used to perform only the validity checks.
* \param ... extra arguments are required according to flags.
*
* \retval 0 in case of success, != 0 otherwise.
* \retval result returns the parsed value in case of success,
* the default value in case of error, or it is left unchanged
* in case of error and no default specified. Note that in certain
* cases (e.g. sockaddr_in, with multi-field return values) some
* of the fields in result may be changed even if an error occurs.
*
* \details
* Examples of use:
* ast_parse_arg("223", PARSE_INT32|PARSE_IN_RANGE,
* &a, -1000, 1000);
* returns 0, a = 223
* ast_parse_arg("22345", PARSE_INT32|PARSE_IN_RANGE|PARSE_DEFAULT,
* &a, 9999, 10, 100);
* returns 1, a = 9999
* ast_parse_arg("22345ssf", PARSE_UINT32|PARSE_IN_RANGE, &b, 10, 100);
* returns 1, b unchanged
* ast_parse_arg("www.foo.biz:44", PARSE_INADDR, &sa);
* returns 0, sa contains address and port
* ast_parse_arg("www.foo.biz", PARSE_INADDR|PARSE_PORT_REQUIRE, &sa);
* returns 1 because port is missing, sa contains address
*/
int ast_parse_arg(const char *arg, enum ast_parse_flags flags,
void *result, ...);
/*
* Parsing config file options in C is slightly annoying because we cannot use
* string in a switch() statement, yet we need a similar behaviour, with many
* branches and a break on a matching one.
* The following somehow simplifies the job: we create a block using
* the CV_START and CV_END macros, and then within the block we can run
* actions such as "if (condition) { body; break; }"
* Additional macros are present to run simple functions (e.g. ast_copy_string)
* or to pass arguments to ast_parse_arg()
*
* As an example:
CV_START(v->name, v->value); // start the block
CV_STR("foo", x_foo); // static string
CV_DSTR("bar", y_bar); // malloc'ed string
CV_F("bar", ...); // call a generic function
CV_END; // end the block
*/
/*! \brief the macro to open a block for variable parsing */
#define CV_START(__in_var, __in_val) \
do { \
const char *__var = __in_var; \
const char *__val = __in_val;
/*! \brief close a variable parsing block */
#define CV_END } while (0)
/*! \brief call a generic function if the name matches. */
#define CV_F(__pattern, __body) if (!strcasecmp((__var), __pattern)) { __body; break; }
/*!
* \brief helper macros to assign the value to a BOOL, UINT, static string and
* dynamic string
*/
#define CV_BOOL(__x, __dst) CV_F(__x, (__dst) = ast_true(__val) )
#define CV_UINT(__x, __dst) CV_F(__x, (__dst) = strtoul(__val, NULL, 0) )
#define CV_STR(__x, __dst) CV_F(__x, ast_copy_string(__dst, __val, sizeof(__dst)))
#define CV_DSTR(__x, __dst) CV_F(__x, ast_free(__dst); __dst = ast_strdup(__val))
#define CV_STRFIELD(__x, __obj, __field) CV_F(__x, ast_string_field_set(__obj, __field, __val))
/*! \brief Check if require type is an integer type */
AST_INLINE_API(
int ast_rq_is_int(require_type type),
{
switch (type) {
case RQ_INTEGER1:
case RQ_UINTEGER1:
case RQ_INTEGER2:
case RQ_UINTEGER2:
case RQ_INTEGER3:
case RQ_UINTEGER3:
case RQ_INTEGER4:
case RQ_UINTEGER4:
case RQ_INTEGER8:
case RQ_UINTEGER8:
return 1;
default:
return 0;
}
}
)
/*!
* \brief Remove standard encoding from realtime values, which ensures
* that a semicolon embedded within a single value is not treated upon
* retrieval as multiple values.
* \param chunk Data to be decoded
* \return The decoded data, in the original buffer
* \since 1.8
* \warn This function modifies the original buffer
*/
char *ast_realtime_decode_chunk(char *chunk);
/*!
* \brief Encodes a chunk of data for realtime
* \param dest Destination buffer
* \param maxlen Length passed through to ast_str_* functions
* \param chunk Source data to be encoded
* \return Buffer within dest
* \since 1.8
*/
char *ast_realtime_encode_chunk(struct ast_str **dest, ssize_t maxlen, const char *chunk);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
#endif /* _ASTERISK_CONFIG_H */
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