66 lines
1.6 KiB
Groff
66 lines
1.6 KiB
Groff
.\" mcookie.1 --
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.\" Public Domain 1995 Rickard E. Faith (faith@cs.unc.edu)
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.TH MCOOKIE 1 "June 2011" "util-linux" "User Commands"
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.SH NAME
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mcookie \- generate magic cookies for xauth
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.SH SYNOPSIS
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.B mcookie
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[\fIoptions\fR]
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.SH DESCRIPTION
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.B mcookie
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generates a 128-bit random hexadecimal number for use with the X authority
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system. Typical usage:
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.RS
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xauth add :0 . `mcookie`
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.RE
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.PP
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The "random" number generated is actually the output of the MD5 message
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digest fed with various pieces of random information: the current time, the
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process id, the parent process id, and optionally the contents of an input
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file. and several bytes of information from the first of the following
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devices which is present:
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.IR /dev/random ,
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.IR /dev/urandom ,
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files in
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.IR /proc ,
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.IR /dev/audio .
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.SH OPTIONS
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.TP
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\fB\-f\fR, \fB\-\-file\fR=\fIFILE\fR
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Use file as a macig cookie seed. When file is defined as `-' character
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input is read from stdin.
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.TP
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\fB\-v\fR, \fB\-\-verbose\fR
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Explain what is being done.
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.TP
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\fB\-V\fR, \fB\-\-version\fR
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Output version information and exit.
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.TP
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\fB\-h\fR, \fB\-\-help\fR
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Display this help and exit.
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.SH BUGS
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The entropy in the generated 128-bit is probably quite small (and,
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therefore, vulnerable to attack) unless a non-pseudorandom number generator
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is used (e.g.,
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.I /dev/random
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under Linux).
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.PP
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It is assumed that none of the devices opened will block.
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.SH FILES
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.I /dev/random
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.br
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.I /dev/urandom
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.br
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.I /dev/audio
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.br
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.I /proc/stat
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.br
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.I /proc/loadavg
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.SH "SEE ALSO"
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.BR X (1),
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.BR xauth (1),
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.BR md5sum (1)
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.SH AVAILABILITY
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The mcookie command is part of the util-linux package and is available from
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ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
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