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Fix a few issues related to the handling of channel variables

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- in pbx_builtin_serialize_variables(), the variable list traversal would stop
   on a variables with empty name/values, which is not appropriate
 - When removing the GROUP variables, use AST_LIST_REMOVE_CURRENT instead of
   AST_LIST_REMOVE
 - During masquerading, when copying the variables list from one channel to the
   other, using AST_LIST_INSERT_TAIL is not valid for appending a whole list.
   It leaves the tail pointer of the list invalid.  Introduce a new macro,
   AST_LIST_APPEND_LIST that appends a list properly.
(issue #7802, softins)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@40994 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Russell Bryant
2006-08-24 19:41:26 +00:00
parent 761d98663f
commit 034a919e1f
3 changed files with 20 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
channel.c
View File

@@ -2891,7 +2891,7 @@ static void clone_variables(struct ast_channel *original, struct ast_channel *cl
AST_LIST_TRAVERSE_SAFE_BEGIN(&original->varshead, varptr, entries) {
if (!strncmp(ast_var_name(varptr), GROUP_CATEGORY_PREFIX, strlen(GROUP_CATEGORY_PREFIX))) {
AST_LIST_REMOVE(&original->varshead, varptr, entries);
AST_LIST_REMOVE_CURRENT(&original->varshead, entries);
ast_var_delete(varptr);
}
}
@@ -2900,7 +2900,7 @@ static void clone_variables(struct ast_channel *original, struct ast_channel *cl
/* Append variables from clone channel into original channel */
/* XXX Is this always correct? We have to in order to keep MACROS working XXX */
if (AST_LIST_FIRST(&clone->varshead))
AST_LIST_INSERT_TAIL(&original->varshead, AST_LIST_FIRST(&clone->varshead), entries);
AST_LIST_APPEND_LIST(&original->varshead, &clone->varshead, entries);
}
/*--- ast_do_masquerade: Masquerade a channel */

17
include/asterisk/linkedlists.h
View File

@@ -429,6 +429,23 @@ struct { \
} \
} while (0)
/*!
\brief Appends a whole list to the tail of a list.
\param head This is a pointer to the list head structure
\param list This is a pointer to the list to be appended.
\param field This is the name of the field (declared using AST_LIST_ENTRY())
used to link entries of this list together.
*/
#define AST_LIST_APPEND_LIST(head, list, field) do { \
if (!(head)->first) { \
(head)->first = (list)->first; \
(head)->last = (list)->last; \
} else { \
(head)->last->field.next = (list)->first; \
(head)->last = (list)->last; \
} \
} while (0)
/*!
\brief Removes and returns the head entry from a list.
\param head This is a pointer to the list head structure

4
pbx.c
View File

@@ -5906,9 +5906,7 @@ int pbx_builtin_serialize_variables(struct ast_channel *chan, char *buf, size_t
memset(buf, 0, size);
AST_LIST_TRAVERSE(&chan->varshead, variables, entries) {
if(variables &&
(var=ast_var_name(variables)) && (val=ast_var_value(variables)) &&
!ast_strlen_zero(var) && !ast_strlen_zero(val)) {
if ((var = ast_var_name(variables)) && (val = ast_var_value(variables))) {
if (ast_build_string(&buf, &size, "%s=%s\n", var, val)) {
ast_log(LOG_ERROR, "Data Buffer Size Exceeded!\n");
break;