MINOR: spoe: add register-var-names directive in spoe-agent configuration
In addition to "option force-set-var", recently added, this directive can be
used to selectivelly register unknown variable names, without totally relaxing
their registration during the runtime, like "option force-set-var" does.
So there is no way for a malicious agent to exhaust memory by defining a too
high number of variable names. In other hand, you need to enumerate all
variable names. This could be painfull in some circumstances.
Remember, this directive is only usefull when the variable names are not
referenced anywhere in the HAProxy configuration or the SPOE one.
Thanks to Etienne Carrière for his help on this part.
diff --git a/include/types/spoe.h b/include/types/spoe.h
index 392cc94..2632601 100644
--- a/include/types/spoe.h
+++ b/include/types/spoe.h
@@ -177,6 +177,13 @@
struct list list; /* Use to chain SPOE placeholders */
};
+/* Used during the config parsing, when SPOE agent section is parsed, to
+ * register some variable names. */
+struct spoe_var_placeholder {
+ char *name; /* The variable name */
+ struct list list; /* Use to chain SPOE var placeholders */
+};
+
/* Describe a message that will be sent in a NOTIFY frame. A message has a name,
* an argument list (see above) and it is linked to a specific event. */
struct spoe_message {