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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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9
tftpd/tftpd.h
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@ -23,4 +23,13 @@ char *tfstrdup(const char *);
extern int verbosity;
struct formats {
const char *f_mode;
char *(*f_rewrite) (const struct formats *, char *, int, int, const char **);
int (*f_validate) (char *, int, const struct formats *, const char **);
void (*f_send) (const struct formats *, struct tftphdr *, int);
void (*f_recv) (const struct formats *, struct tftphdr *, int);
int f_convert;
};
#endif