* (C) Copyright 2012
* Joe Hershberger, National Instruments, joe.hershberger@ni.com
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <linux/string.h>
#endif
static const char env_flags_vartype_rep[] = "sdxb" ENV_FLAGS_NET_VARTYPE_REPS;
+static const char env_flags_varaccess_rep[] = "aroc";
+static const int env_flags_varaccess_mask[] = {
+ 0,
+ ENV_FLAGS_VARACCESS_PREVENT_DELETE |
+ ENV_FLAGS_VARACCESS_PREVENT_CREATE |
+ ENV_FLAGS_VARACCESS_PREVENT_OVERWR,
+ ENV_FLAGS_VARACCESS_PREVENT_DELETE |
+ ENV_FLAGS_VARACCESS_PREVENT_OVERWR,
+ ENV_FLAGS_VARACCESS_PREVENT_DELETE |
+ ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR};
+
+#ifdef CONFIG_CMD_ENV_FLAGS
+static const char * const env_flags_vartype_names[] = {
+ "string",
+ "decimal",
+ "hexadecimal",
+ "boolean",
+#ifdef CONFIG_CMD_NET
+ "IP address",
+ "MAC address",
+#endif
+};
+static const char * const env_flags_varaccess_names[] = {
+ "any",
+ "read-only",
+ "write-once",
+ "change-default",
+};
+
+/*
+ * Print the whole list of available type flags.
+ */
+void env_flags_print_vartypes(void)
+{
+ enum env_flags_vartype curtype = (enum env_flags_vartype)0;
+
+ while (curtype != env_flags_vartype_end) {
+ printf("\t%c -\t%s\n", env_flags_vartype_rep[curtype],
+ env_flags_vartype_names[curtype]);
+ curtype++;
+ }
+}
+
+/*
+ * Print the whole list of available access flags.
+ */
+void env_flags_print_varaccess(void)
+{
+ enum env_flags_varaccess curaccess = (enum env_flags_varaccess)0;
+
+ while (curaccess != env_flags_varaccess_end) {
+ printf("\t%c -\t%s\n", env_flags_varaccess_rep[curaccess],
+ env_flags_varaccess_names[curaccess]);
+ curaccess++;
+ }
+}
+
+/*
+ * Return the name of the type.
+ */
+const char *env_flags_get_vartype_name(enum env_flags_vartype type)
+{
+ return env_flags_vartype_names[type];
+}
+
+/*
+ * Return the name of the access.
+ */
+const char *env_flags_get_varaccess_name(enum env_flags_varaccess access)
+{
+ return env_flags_varaccess_names[access];
+}
+#endif /* CONFIG_CMD_ENV_FLAGS */
/*
* Parse the flags string from a .flags attribute list into the vartype enum.
return env_flags_vartype_string;
}
+/*
+ * Parse the flags string from a .flags attribute list into the varaccess enum.
+ */
+enum env_flags_varaccess env_flags_parse_varaccess(const char *flags)
+{
+ char *access;
+
+ if (strlen(flags) <= ENV_FLAGS_VARACCESS_LOC)
+ return env_flags_varaccess_any;
+
+ access = strchr(env_flags_varaccess_rep,
+ flags[ENV_FLAGS_VARACCESS_LOC]);
+
+ if (access != NULL)
+ return (enum env_flags_varaccess)
+ (access - &env_flags_varaccess_rep[0]);
+
+ printf("## Warning: Unknown environment variable access method '%c'\n",
+ flags[ENV_FLAGS_VARACCESS_LOC]);
+ return env_flags_varaccess_any;
+}
+
+/*
+ * 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)
+{
+ int i;
+
+ for (i = 0; i < sizeof(env_flags_varaccess_mask); i++)
+ if (env_flags_varaccess_mask[i] ==
+ (binflags & ENV_FLAGS_VARACCESS_BIN_MASK))
+ return (enum env_flags_varaccess)i;
+
+ printf("Warning: Non-standard access flags. (0x%x)\n",
+ binflags & ENV_FLAGS_VARACCESS_BIN_MASK);
+
+ return env_flags_varaccess_any;
+}
+
static inline int is_hex_prefix(const char *value)
{
return value[0] == '0' && (value[1] == 'x' || value[1] == 'X');
return env_flags_parse_vartype(flags);
}
+/*
+ * Look up the access of a variable directly from the .flags var.
+ */
+enum env_flags_varaccess env_flags_get_varaccess(const char *name)
+{
+ const char *flags_list = getenv(ENV_FLAGS_VAR);
+ char flags[ENV_FLAGS_ATTR_MAX_LEN + 1];
+
+ if (env_flags_lookup(flags_list, name, flags))
+ return env_flags_varaccess_any;
+
+ if (strlen(flags) <= ENV_FLAGS_VARACCESS_LOC)
+ return env_flags_varaccess_any;
+
+ return env_flags_parse_varaccess(flags);
+}
+
/*
* Validate that the proposed new value for "name" is valid according to the
* defined flags for that variable, if any.
return 0;
}
+/*
+ * 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)
+{
+ enum env_flags_varaccess access;
+ int access_mask;
+
+ access = env_flags_get_varaccess(name);
+ access_mask = env_flags_varaccess_mask[access];
+
+ return (check_mask & access_mask) != 0;
+}
+
/*
* Validate the parameters to "env set" directly
*/
*/
static int env_parse_flags_to_bin(const char *flags)
{
- return env_flags_parse_vartype(flags) & ENV_FLAGS_VARTYPE_BIN_MASK;
+ int binflags;
+
+ binflags = env_flags_parse_vartype(flags) & ENV_FLAGS_VARTYPE_BIN_MASK;
+ binflags |= env_flags_varaccess_mask[env_flags_parse_varaccess(flags)];
+
+ return binflags;
}
+static int first_call = 1;
+static const char *flags_list;
+
/*
* Look for possible flags for a newly added variable
* This is called specifically when the variable did not exist in the hash
void env_flags_init(ENTRY *var_entry)
{
const char *var_name = var_entry->key;
- const char *flags_list = getenv(ENV_FLAGS_VAR);
char flags[ENV_FLAGS_ATTR_MAX_LEN + 1] = "";
int ret = 1;
+ if (first_call) {
+ flags_list = getenv(ENV_FLAGS_VAR);
+ first_call = 0;
+ }
/* look in the ".flags" and static for a reference to this variable */
ret = env_flags_lookup(flags_list, var_name, flags);
int flag)
{
const char *name;
-#if !defined(CONFIG_ENV_OVERWRITE) && defined(CONFIG_OVERWRITE_ETHADDR_ONCE) \
-&& defined(CONFIG_ETHADDR)
const char *oldval = NULL;
if (op != env_op_create)
oldval = item->data;
-#endif
name = item->key;
/* Default value for NULL to protect string-manipulating functions */
newval = newval ? : "";
-#ifndef CONFIG_ENV_OVERWRITE
- /*
- * Some variables like "ethaddr" and "serial#" can be set only once and
- * cannot be deleted, unless CONFIG_ENV_OVERWRITE is defined.
- */
- if (op != env_op_create && /* variable exists */
- (flag & H_FORCE) == 0) { /* and we are not forced */
- if (strcmp(name, "serial#") == 0 ||
- (strcmp(name, "ethaddr") == 0
-#if defined(CONFIG_OVERWRITE_ETHADDR_ONCE) && defined(CONFIG_ETHADDR)
- && strcmp(oldval, __stringify(CONFIG_ETHADDR)) != 0
-#endif /* CONFIG_OVERWRITE_ETHADDR_ONCE && CONFIG_ETHADDR */
- )) {
- printf("Can't overwrite \"%s\"\n", name);
- return 1;
- }
- }
-#endif
-
/* validate the value to match the variable type */
if (op != env_op_delete) {
enum env_flags_vartype type = (enum env_flags_vartype)
}
}
+ /* check for access permission */
+#ifndef CONFIG_ENV_ACCESS_IGNORE_FORCE
+ if (flag & H_FORCE)
+ return 0;
+#endif
+ switch (op) {
+ case env_op_delete:
+ if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_DELETE) {
+ printf("## Error: Can't delete \"%s\"\n", name);
+ return 1;
+ }
+ break;
+ case env_op_overwrite:
+ if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_OVERWR) {
+ printf("## Error: Can't overwrite \"%s\"\n", name);
+ return 1;
+ } else if (item->flags &
+ ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR) {
+ const char *defval = getenv_default(name);
+
+ if (defval == NULL)
+ defval = "";
+ printf("oldval: %s defval: %s\n", oldval, defval);
+ if (strcmp(oldval, defval) != 0) {
+ printf("## Error: Can't overwrite \"%s\"\n",
+ name);
+ return 1;
+ }
+ }
+ break;
+ case env_op_create:
+ if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_CREATE) {
+ printf("## Error: Can't create \"%s\"\n", name);
+ return 1;
+ }
+ break;
+ }
+
return 0;
}
projects / karo-tx-uboot.git / blobdiff