Looking for internship in software company

I am a Computer Science & Engineering student pursuing my B.Tech. from NIT Bhopal. I am presently in my 5th semester. I am planning to do my internship at the end of my 3rd Year. So, i am looking for a summer internship program in software company preferably in Pune. Can anybody help me out please. How to find companies which are providing summer interns program? or how to directly contact a company for internship?