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We one-time-pad the timestamp with a random key instead. This will provide enough entropy to be unique, but not leak the system date. Even with a bad RNG state it should guarantee uniqueness, however.
60 lines
1.1 KiB
Groff
60 lines
1.1 KiB
Groff
.Dd December 25, 2018
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.Dt MGENMID 1
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.Os
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.Sh NAME
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.Nm mgenmid
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.Nd generate a Message-ID
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.Sh SYNOPSIS
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.Nm
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.Sh DESCRIPTION
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.Nm
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generates and prints a unique Message-ID.
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The Message-ID consists of an encrypted timestamp,
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a random value,
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and a fully qualified domain name.
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.Pp
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The fully qualified domain name is arrived at by:
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.Bl -enum
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.It
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Using
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.Sq Li FQDN\&:
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from
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.Pa "${MBLAZE:-$HOME/.mblaze}/profile"
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.Pq if set .
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.It
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Resolving the current hostname.
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.It
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Using the domain component of the mail address in
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.Sq Li Local\&-Mailbox\&:
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from
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.Pa "${MBLAZE:-$HOME/.mblaze}/profile"
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.Pq if set .
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.El
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.Pp
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If these steps don't result in a fully qualified domain name,
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.Nm
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fails.
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.Sh EXIT STATUS
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.Ex -std
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.Sh SEE ALSO
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.Xr mblaze-profile 5
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.Rs
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.%A M. Curtin
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.%A J. Zawinski
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.%D July 1998
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.%R draft-ietf-usefor-message-id-01.txt
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.%T Recommendations for generating Message IDs
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.Re
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.Sh AUTHORS
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.An Leah Neukirchen Aq Mt leah@vuxu.org
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.Sh LICENSE
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.Nm
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is in the public domain.
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.Pp
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To the extent possible under law,
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the creator of this work
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has waived all copyright and related or
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neighboring rights to this work.
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.Pp
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.Lk http://creativecommons.org/publicdomain/zero/1.0/
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