Mirroring Informix data in Oracle on Unix

Hello experts, what is the cheapest way (not using expensive tools) to mirror data from an informix database in an oracle database (both running on unix platforms). Because we can not involove a third computer we have no chance to use ODBC on a Windows-PC. What other possibilitiees are there. Could perl be a solution? Please help. If anyone has got a program, it would be interesting to know how I could get this. Thanks a lot Manfred Tischendorf