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tftpd: allow a rewrite rule to probe for the existence of a file

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This adds an "E" flag to the rewrite rules, which exits rule
processing if and only if the result is a valid, accessible
filename. If combined with "r", the rewrite is cancelled if the rule
is not applied.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2024-05-29 17:16:06 -07:00
parent 1dc6d55811
commit 6f96fcd1b6
5 changed files with 103 additions and 47 deletions
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13
tftpd/tftpd.8.in
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@ -281,6 +281,15 @@ case-insensitively. By default it is case sensitive.
.B e
If this rule matches, end rule processing after executing the rule.
.TP
.B E
If this rule matches,
\fIand the result matches a filename that can be transferred\fP,
end rule processing after executing the rule. If this is combined with
.BR r ,
then if the substitution does \fInot\fP result in a valid filename,
the substitution is undone. This cannot be combined with
.BR g .
.TP
.B s
If this rule matches, start rule processing over from the very first
rule after executing this rule.
@ -307,10 +316,10 @@ Inverse the sense of this rule, i.e. execute the
only if the
.I regex
.I doesn't
match. Cannot used together with
match. Cannot used together with
.BR r .
.PP
The following escape sequences are recognized as part of the
The following escape sequences are recognized as part of a
.IR "replacement pattern" :
.TP
\fB\\0\fP