NAME

       dsniff - password sniffer

SYNOPSIS

       dsniff [-c] [-d] [-m] [-n] [-i interface | -p pcapfile] [-s snaplen] [-f services] [-t
       trigger[,...]]]  [-r|-w savefile] [expression]

DESCRIPTION

       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.

OPTIONS

       -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.

       -i interface
              Specify the interface to listen on.

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

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

       -f services
              Load triggers from a services file.

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

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

       -w file
              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.

FILES

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

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

SEE ALSO

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

AUTHOR

       Dug Song <dugsong@monkey.org>

BUGS

       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)