Driver specific template escaping #4666
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Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
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Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
In order to recurse into our grammar we can't use global variables to track objects we are parsing into. This solution uses the $0 value for rule actions to pass arguments to that specific rule, this time the LogTemplate instance we need to parse into. That way the LogTemplate instance would be separate even if we are recursing into the same parts of the grammar. A similar solution could potentially be established to all similar cases, using global variables in a recursive grammar is not right. Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
To be able to use separate grammar rules for template references and inline templates. Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
…dule Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
A top_level LogTemplate is one which is instantiated directly from the configuration or by a driver. For embedded LogTemplate instances (e.g. within function invocations), this is FALSE. The idea is that some operations (e.g. escaping) are only performed at the top level. Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
With this patch it becomes possible to enable escaping from both the LogTemplate side (e.g. when template-escape(yes) is present in a template statement) and the LogTemplateOptions side (e.g. with the destination driver specific template-escape()) option. Previously only LogWriter supplied this setting and it only worked in case of an inline template. With this change, this works with all drivers that support the `template_option` grammar rule. Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Earlier, template functions were performing escaping as a part of their
own expansion of macros/values. This means that a template-escape(yes)
template, with embedded template functions, the template functions received
its arguments in an escaped form.
For example this template:
template t_escaped {
template("$(echo $(length ${value}))");
template-escape(yes)
};
where $value contains characters that need to be escaped (e.g. quotes
or control characters), $(length) received the escaped format.
This patch changes this behaviour slightly by:
1) embedded template expressions always get strings in an unescaped form
2) the end result of functions are escaped at the top-level.
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
This patch moves escaping to one layer higher, thereby ensuring a consistent escaping implmentation and simplifying the lower layers. Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
With this change the call-site of log_template_format_*() family of functions can supply a custom escaping mechanism. Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
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tests/light/src/syslog_ng_config/statements/template/template.py
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Signed-off-by: Attila Szakacs <attila.szakacs@axoflow.com>
Signed-off-by: Attila Szakacs <attila.szakacs@axoflow.com>
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Signed-off-by: Attila Szakacs <attila.szakacs@axoflow.com>
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Signed-off-by: Attila Szakacs <attila.szakacs@axoflow.com>
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This is an alternative for #4664 which generalizes template-escape() to allow driver specific escaping modes and also makes it easy for drivers to request escaping of a template expansion.
The idea is to allow the http() destination to use templates in the url() parameter. Allowing unsanitized input in an URL string could pose a security risk, so doing URL encoding of the values make would make sense.