[Freeswitch-dev] Substutions in XML dial plan

Simon Perreault simon.perreault at viagenie.ca
Wed Jun 25 14:16:32 EDT 2008


My dial plan contains something like the following:

<action application="bridge" data="sofia/profile1/$1,sofia/profile2/$1"/>

This causes a problem in mod_dialplan_xml.c, near line 150:

                len = (uint32_t) (strlen(data) + strlen(field_data) + 10);
                if (!(substituted = malloc(len))) {
SWITCH_LOG_CRIT, "memory error!\n");
                    proceed = 0;
                    goto done;
                memset(substituted, 0, len);
                switch_perform_substitution(re, proceed, data, field_data, 
substituted, len, ovector);
                app_data = substituted;

The problem is simple: len is too small because the $1 pattern appears twice. 
Therefore adding strlen(field_data) once is not enough. It should be 
multiplied by the number of times the pattern appears in the string.

It seems like someone experienced the same problem before: that would explain 
the "+ 10" magic number which I am very tempted to just increase to 100. ;-)

Is this really a bug or is it my imagination? If it is a bug, how should we go 
about fixing it?


Please try Numb, a STUN/TURN server implementation.
Free access at http://numb.viagenie.ca/.

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