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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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4
tftpd/remap.h
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@ -35,7 +35,9 @@ struct rule *parserulefile(FILE *);
void freerules(struct rule *);
/* Execute a rule set on a string; returns a malloc'd new string. */
char *rewrite_string(const char *, const struct rule *, char, int,
struct formats;
char *rewrite_string(const struct formats *, const char *,
const struct rule *, char, int,
match_pattern_callback, const char **);
#endif /* WITH_REGEX */