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| author | Yu Watanabe <watanabe.yu+github@gmail.com> | 2022-01-24 06:07:33 +0900 |
|---|---|---|
| committer | Yu Watanabe <watanabe.yu+github@gmail.com> | 2022-01-24 06:45:37 +0900 |
| commit | 3b2ac14ac45bef01cf489c3231b868936866444b (patch) | |
| tree | eeb9a96bef1b949c4f5b11c87db2904e711967bd /src/resolve/resolved-dns-scope.c | |
| parent | 7bdf41983044268b4bc2f9d34462db7f89ba284a (diff) | |
| download | systemd-3b2ac14ac45bef01cf489c3231b868936866444b.tar.gz | |
resolve: synthesize empty name
Do not return any error for empty name. Just returns empty answer.
Before:
---
$ dig .
; <<>> DiG 9.16.24-RH <<>> .
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 13617
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;. IN A
;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Mon Jan 24 05:49:30 JST 2022
;; MSG SIZE rcvd: 28
---
After:
---
$ dig .
; <<>> DiG 9.16.24-RH <<>> .
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7957
;; flags: qr aa rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;. IN A
;; Query time: 1 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Mon Jan 24 06:05:02 JST 2022
;; MSG SIZE rcvd: 28
---
Replaces #22197.
Fixes RHBZ#2039854 (https://bugzilla.redhat.com/show_bug.cgi?id=2039854).
Diffstat (limited to 'src/resolve/resolved-dns-scope.c')
| -rw-r--r-- | src/resolve/resolved-dns-scope.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c index c0f6df6447..f0d0ca4bba 100644 --- a/src/resolve/resolved-dns-scope.c +++ b/src/resolve/resolved-dns-scope.c @@ -613,6 +613,10 @@ DnsScopeMatch dns_scope_good_domain( if ((SD_RESOLVED_FLAGS_MAKE(s->protocol, s->family, false, false) & flags) == 0) return DNS_SCOPE_NO; + /* Never resolve empty name. */ + if (dns_name_is_empty(domain)) + return DNS_SCOPE_NO; + /* Never resolve any loopback hostname or IP address via DNS, LLMNR or mDNS. Instead, always rely on * synthesized RRs for these. */ if (is_localhost(domain) || |