expose function execution routines and warn about trying to set a read-only cdr var

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5589 65c4cc65-6c06-0410-ace0-fbb531ad65f3

cdr.c

@@ -209,7 +209,19 @@ int ast_cdr_setvar(struct ast_cdr *cdr, const char *name, const char *value, int
 {
 	struct ast_var_t *newvariable;
     struct varshead *headp;
+	const char *read_only[] = { "clid", "src", "dst", "dcontext", "channel", "dstchannel",
+								"lastapp", "lastdata", "start", "answer", "end", "duration",
+								"billsec", "disposition", "amaflags", "accountcode", "uniqueid",
+								"userfield", NULL };
+	int x;
 	
+	for(x = 0; read_only[x]; x++) {
+		if (!strcasecmp(name, read_only[x])) {
+			ast_log(LOG_ERROR, "Attempt to set a read-only variable!.\n");
+			return -1;
+		}
+	}
+
     if (!cdr) {
 		ast_log(LOG_ERROR, "Attempt to set a variable on a nonexistent CDR record.\n");
 		return -1;

include/asterisk/pbx.h

@@ -602,6 +602,29 @@ int ast_async_goto_if_exists(struct ast_channel *chan, char* context, char *exte
 struct ast_custom_function* ast_custom_function_find(char *name);
 int ast_custom_function_unregister(struct ast_custom_function *acf);
 int ast_custom_function_register(struct ast_custom_function *acf);
+	
+/*! executes a read operation on a function */
+/*!
+ * \param chan Channel to execute on
+ * \param in Data containing the function call string
+ * \param workspace A pointer to safe memory to use for a return value 
+ * \param len the number of bytes in workspace
+ * This application executes an function in read mode on a given channel.
+ * It returns a pointer to workspace if the buffer contains any new data
+ * or NULL if there was a problem.
+ */
+	
+char *ast_func_read(struct ast_channel *chan, const char *in, char *workspace, size_t len);
+
+/*! executes a write operation on a function */
+/*!
+ * \param chan Channel to execute on
+ * \param in Data containing the function call string
+ * \param value A value parameter to pass for writing
+ * This application executes an function in write mode on a given channel.
+ * It has no return value.
+ */
+void ast_func_write(struct ast_channel *chan, const char *in, const char *value);
 
 #if defined(__cplusplus) || defined(c_plusplus)
 }

pbx.c

@@ -207,8 +207,6 @@ static int pbx_builtin_saycharacters(struct ast_channel *, void *);
 static int pbx_builtin_sayphonetic(struct ast_channel *, void *);
 int pbx_builtin_setvar(struct ast_channel *, void *);
 static int pbx_builtin_importvar(struct ast_channel *, void *);
-static char *ast_func_read(struct ast_channel *chan, const char *in, char *workspace, size_t len);
-static void ast_func_write(struct ast_channel *chan, const char *in, const char *value);
 
 static struct varshead globals;
 
@@ -1313,7 +1311,7 @@ char *ast_func_read(struct ast_channel *chan, const char *in, char *workspace, s
 	return ret;
 }
 
-static void ast_func_write(struct ast_channel *chan, const char *in, const char *value)
+void ast_func_write(struct ast_channel *chan, const char *in, const char *value)
 {
 	char *args = NULL, *function, *p;
 	struct ast_custom_function *acfptr;