dsniff - password sniffer

       Dug Song <dugsong@monkey.org>

dsniff's automatic protocol detection feature is based on the classic file(1) command by Ian Darwin, and
       shares its historical limitations and bugs.

                                                                                                       DSNIFF(8)

dsniff is a password sniffer which handles FTP, Telnet, SMTP, HTTP, POP, poppass, NNTP, IMAP, SNMP, LDAP,
       Rlogin,  RIP, OSPF, PPTP MS-CHAP, NFS, VRRP, YP/NIS, SOCKS, X11, CVS, IRC, AIM, ICQ, Napster, PostgreSQL,
       Meeting Maker, Citrix ICA, Symantec pcAnywhere, NAI Sniffer, Microsoft SMB, Oracle  SQL*Net,  Sybase  and
       Microsoft SQL protocols.

       dsniff  automatically detects and minimally parses each application protocol, only saving the interesting
       bits, and uses Berkeley DB as its output file format, only logging unique authentication  attempts.  Full
       TCP/IP reassembly is provided by libnids(3).

       I  wrote  dsniff  with  honest intentions - to audit my own network, and to demonstrate the insecurity of
       cleartext network protocols.  Please do not abuse this software.

/usr/share/dsniff/dsniff.services
              Default trigger table

       /usr/share/dsniff/dsniff.magic
              Network protocol magic

       dsniff - password sniffer

-c     Perform half-duplex TCP stream reassembly, to handle asymmetrically routed traffic (such  as  when
              using arpspoof(8) to intercept client traffic bound for the local gateway).

       -d     Enable debugging mode.

       -m     Enable automatic protocol detection.

       -n     Do not resolve IP addresses to hostnames.

       -iinterface
              Specify the interface to listen on.

       -ppcapfile
              Rather  than  processing  the contents of packets observed upon the network process the given PCAP
              capture file.

       -ssnaplen
              Analyze at most the first snaplen bytes of each TCP connection, rather than the default of 1024.

       -fservices
              Load triggers from a services file.

        -ttrigger[,...]
              Load triggers from a comma-separated list, specified as port/proto=service (e.g. 80/tcp=http).

       -rsavefile
              Read sniffed sessions from a savefile created with the -w option.

       -wfile
              Write sniffed sessions to savefile rather than parsing and printing them out.

       expression
              Specify a tcpdump(8) filter expression to select traffic to sniff.

       On a hangup signal dsniff will dump its current trigger table to dsniff.services.

arpspoof(8), libnids(3), services(5), magic(5)

dsniff [-c] [-d] [-m] [-n] [-iinterface | -ppcapfile] [-ssnaplen] [-fservices] [-ttrigger[,...]]]
       [-r|-wsavefile] [expression]