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Convert DNS names in logs to all lower case.

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0x20 encoding makes them look odd, otherwise.
This commit is contained in:
Simon Kelley
2025-01-20 15:25:26 +00:00
parent 995a16ca0c
commit bb8811d472
1 changed files with 22 additions and 6 deletions
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22
src/cache.c
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@@ -1852,14 +1852,30 @@ int cache_make_stat(struct txt_record *t)
#endif #endif
/* There can be names in the cache containing control chars, don't /* There can be names in the cache containing control chars, don't
mess up logging or open security holes. */ mess up logging or open security holes. Also convert to all-LC
so that 0x20-encoding doesn't make logs look like ransom notes
made out of letters cut from a newspaper.
Overwrites daemon->workspacename */
static char *sanitise(char *name) static char *sanitise(char *name)
{ {
unsigned char *r; unsigned char *r = (unsigned char *)name;
if (name) if (name)
for (r = (unsigned char *)name; *r; r++) {
char *d = name = daemon->workspacename;
for (; *r; r++, d++)
if (!isprint((int)*r)) if (!isprint((int)*r))
return "<name unprintable>"; return "<name unprintable>";
else
{
unsigned char c = *r;
*d = (char)((c >= 'A' && c <= 'Z') ? c + 'a' - 'A' : c);
}
*d = 0;
}
return name; return name;
} }