Nagios Support Forum

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> > To me $_HOSTUNDEFINEDMACRO$ should evaluate to an empty string rather
> > than being left untouched. Especially when used in commands, the
> > $_HOSTUNDEFINEDMACRO part gets interpreted by the shell (usually empty)
> > and the trailing $ is displayed plainly.
> >
> > Following patch is made against 3.0.5 but applies cleanly to latest git
> > snapshot from git.nagiosprojects.org. It changes the behavior for custom
> > macros.
> >
> > Does anyone see any reasons why this should not be changed?
> >
>
> It makes it impossible to use shell variables in commands.
> Imagine something like this:
>
> echo "hoopla" > $HOME/$HOSTADDRESS$

Don't single $s need to be escaped using $$ ?
I made a short test. A similar line didn't work for me with current
version since everything between two $-signs seems to be considered as a
macro.

> A better way of achieving what you want is to extend the macro
> syntax so that
>
> $?_RANDOMCUSTOMVARIABLE$
>
> expands to nothing if _RANDOMCUSTOMVARIABLE can't be located

Good idea. So how about following?

I also attached the patch as a file in case of wrapping problems.

Matthias
--- nagios-3.0.6/include/macros.h 2008-11-30 18:22:59.000000000 +0100
+++ nagios-3.0.6/include/macros.h.new 2009-04-09 13:18:53.850676500
+0200
@@ -248,7 +248,7 @@
int grab_standard_contact_macro(int,contact *,char **);
int grab_contact_address_macro(int,contact *,char **);
int grab_standard_contactgroup_macro(int,contactgroup *,char **);
-int grab_custom_object_macro(char *,customvariablesmember *,char **);
+int grab_custom_object_macro(char *,customvariablesmember *,char **,
int);


#ifdef NSCORE
--- nagios-3.0.6/common/macros.c 2008-11-30 18:22:58.000000000 +0100
+++ nagios-3.0.6/common/macros.c.new 2009-04-09 13:18:44.866115000 +0200
@@ -609,7 +609,7 @@
}

/***** CUSTOM VARIABLE MACROS *****/
- else if(macro_name[0]=='_'){
+ else if(macro_name[0]=='_' || strstr(macro_name, "?_")==macro_name){

/* get the macro value */
result=grab_custom_macro_value(macro_name,arg[0],arg[1],output);
@@ -1282,12 +1282,18 @@
contactgroup *temp_contactgroup=NULL;
contactsmember *temp_contactsmember=NULL;
int delimiter_len=0;
+ int undef_is_empty=FALSE;
char *temp_buffer=NULL;
int result=OK;

if(macro_name==NULL || output==NULL)
return ERROR;

+ if(macro_name[0]=='?'){
+ undef_is_empty=TRUE;
+ macro_name++;
+ }
+
/***** CUSTOM HOST MACRO *****/
if(strstr(macro_name,"_HOST")==macro_name){

@@ -1305,7 +1311,7 @@
return ERROR;

/* get the host macro value */
- result=grab_custom_object_macro(macro_name
+5,temp_host->custom_variables,output);
+ result=grab_custom_object_macro(macro_name
+5,temp_host->custom_variables,output,undef_is_empty);
}

/* a host macro with a hostgroup name and delimiter */
@@ -1356,7 +1362,7 @@
return ERROR;

/* get the service macro value */
- result=grab_custom_object_macro(macro_name
+8,temp_service->custom_variables,output);
+ result=grab_custom_object_macro(macro_name
+8,temp_service->custom_variables,output,undef_is_empty);
}

/* else and ondemand macro... */
@@ -1368,7 +1374,7 @@

if((temp_service=find_service((macro_host_ptr)?macro_host_ptr->name:NULL,arg2))){

/* get the service macro value */
- result=grab_custom_object_macro(macro_name
+8,temp_service->custom_variables,output);
+ result=grab_custom_object_macro(macro_name
+8,temp_service->custom_variables,output,undef_is_empty);
}

/* else we have a service macro with a servicegroup name and a
delimiter... */
@@ -1428,7 +1434,7 @@
return ERROR;

/* get the contact macro value */
- result=grab_custom_object_macro(macro_name
+8,temp_contact->custom_variables,output);
+ result=grab_custom_object_macro(macro_name
+8,temp_contact->custom_variables,output,undef_is_empty);
}

/* a contact macro with a contactgroup name and delimiter */
@@ -2371,11 +2377,15 @@


/* computes a custom object macro */
-int grab_custom_object_macro(char *macro_name, customvariablesmember
*vars, char **output){
+int grab_custom_object_macro(char *macro_name, customvariablesmem

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