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env: Add support for access control to .flags

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Add support for read-only, write-once, and change-default.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Joe Hershberger
2012-12-11 22:16:34 -06:00
committed by Tom Rini
parent fffad71bc4
commit 267541f776
7 changed files with 330 additions and 18 deletions
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50
include/env_flags.h
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@@ -36,9 +36,18 @@ enum env_flags_vartype {
env_flags_vartype_end
};
enum env_flags_varaccess {
env_flags_varaccess_any,
env_flags_varaccess_readonly,
env_flags_varaccess_writeonce,
env_flags_varaccess_changedefault,
env_flags_varaccess_end
};
#define ENV_FLAGS_VAR ".flags"
#define ENV_FLAGS_ATTR_MAX_LEN 2
#define ENV_FLAGS_VARTYPE_LOC 0
#define ENV_FLAGS_VARACCESS_LOC 1
#ifndef CONFIG_ENV_FLAGS_LIST_STATIC
#define CONFIG_ENV_FLAGS_LIST_STATIC ""
@@ -52,27 +61,57 @@ enum env_flags_vartype {
* Print the whole list of available type flags.
*/
void env_flags_print_vartypes(void);
/*
* Print the whole list of available access flags.
*/
void env_flags_print_varaccess(void);
/*
* Return the name of the type.
*/
const char *env_flags_get_vartype_name(enum env_flags_vartype type);
/*
* Return the name of the access.
*/
const char *env_flags_get_varaccess_name(enum env_flags_varaccess access);
#endif
/*
* Parse the flags string from a .flags attribute list into the vartype enum.
*/
enum env_flags_vartype env_flags_parse_vartype(const char *flags);
/*
* Parse the flags string from a .flags attribute list into the varaccess enum.
*/
enum env_flags_varaccess env_flags_parse_varaccess(const char *flags);
/*
* Parse the binary flags from a hash table entry into the varaccess enum.
*/
enum env_flags_varaccess env_flags_parse_varaccess_from_binflags(int binflags);
#ifdef USE_HOSTCC
/*
* Look up the type of a variable directly from the .flags var.
*/
enum env_flags_vartype env_flags_get_type(const char *name);
/*
* Look up the access of a variable directly from the .flags var.
*/
enum env_flags_varaccess env_flags_get_access(const char *name);
/*
* Validate the newval for its type to conform with the requirements defined by
* its flags (directly looked at the .flags var).
*/
int env_flags_validate_type(const char *name, const char *newval);
/*
* Validate the newval for its access to conform with the requirements defined
* by its flags (directly looked at the .flags var).
*/
int env_flags_validate_access(const char *name, int check_mask);
/*
* Validate that the proposed access to variable "name" is valid according to
* the defined flags for that variable, if any.
*/
int env_flags_validate_varaccess(const char *name, int check_mask);
/*
* Validate the parameters passed to "env set" for type compliance
*/
@@ -94,13 +133,18 @@ void env_flags_init(ENTRY *var_entry);
int env_flags_validate(const ENTRY *item, const char *newval, enum env_op op,
int flag);
#endif /* USE_HOSTCC */
/*
* These are the binary flags used in the environment entry->flags variable to
* decribe properties of veriables in the table
*/
#define ENV_FLAGS_VARTYPE_BIN_MASK 0x00000007
#define ENV_FLAGS_VARTYPE_BIN_MASK 0x00000007
/* The actual variable type values use the enum value (within the mask) */
#endif /* USE_HOSTCC */
#define ENV_FLAGS_VARACCESS_PREVENT_DELETE 0x00000008
#define ENV_FLAGS_VARACCESS_PREVENT_CREATE 0x00000010
#define ENV_FLAGS_VARACCESS_PREVENT_OVERWR 0x00000020
#define ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR 0x00000040
#define ENV_FLAGS_VARACCESS_BIN_MASK 0x00000078
#endif /* __ENV_FLAGS_H__ */