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when logging email addresses with IDNA domain and/or special characters or utf8 in localpart, log both native utf8 form and form with escape localpart and ascii-only domain

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the idea is to make it clear from the logging if non-ascii characters are used.

this is implemented by making mlog recognize if a field value that will be
logged has a LogString method. if so, that value is logged. dns.Domain,
smtp.Address, smtp.Localpart, smtp.Path now have a LogString method.

some explicit calls to String have been replaced to LogString, and some %q
formatting have been replaced with %s, because the escaped localpart would
already have double quotes, and double doublequotes aren't easy to read.
This commit is contained in:
Mechiel Lukkien
2023-03-09 20:18:34 +01:00
parent eb26e9b921
commit 5742ed1537
12 changed files with 93 additions and 18 deletions
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4
http/admin.go
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@ -511,7 +511,7 @@ func checkDomain(ctx context.Context, resolver dns.Resolver, dialer *net.Dialer,
mxs, err := resolver.LookupMX(ctx, domain.ASCII+".")
if err != nil {
addf(&r.MX.Errors, "Looking up MX records for %q: %s", domain, err)
addf(&r.MX.Errors, "Looking up MX records for %s: %s", domain, err)
}
r.MX.Records = make([]MX, len(mxs))
for i, mx := range mxs {
@ -1397,7 +1397,7 @@ func dnsblsStatus(ctx context.Context, resolver dns.Resolver) map[string]map[str
if expl != "" {
result += ": " + expl
}
r[ipstr][zone.String()] = result
r[ipstr][zone.LogString()] = result
}
}
return r