networking - Read IMAP packets from a tcpdump file in JAVA -

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i have write program in java called imapsniffer.java analyzes imap packets (i.e., packets source or destination port of 143) contained in tcpdump file , outputs captured valid imap username/password pairs when terminates. valid username/password pair username , password has been accepted imap server. after reading imap packets tcpdump file program should exit exit code 0 captured usernames , passwords have been printed . in case of errors (e.g., wrong number of arguments, file not found, etc.) program should exit exit code 1

all found on internet programs sniffed packets devices attached systems (listening live traffic network device) none them had code sniff data saved file has packets pop3 , http imap etc ....

all need step step tutorial how .. beginner java , first encounter it.. or link job ...


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