systemd/SOURCES/0363-resolvectl-don-t-filter-loopback-DNS-server-from-glo.patch

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2023-11-07 11:29:40 +00:00
From 94bcb43713447d943c5123dc8baac96c4e37bb26 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 4 Jan 2023 16:36:15 +0100
Subject: [PATCH] resolvectl: don't filter loopback DNS server from global DNS
server list
"resolvectl status" shows per-link DNS servers separately from global
ones. When querying the global list, it will contain both per-link and
global servers however. Thus, to not show duplicate info we filter all
entries that actually have a non-zero ifindex set (under the assumption
that that's a per-link server).
This doesn't work if people configured 127.0.0.1 as global server
though, as we'll add ifindex 1 to it since
6e32414a66ff8dbcef233981a7066684d903ee9f unconditionally even for global
servers.
Let's address that by excluding entries with ifindex 1 from suppression.
This is safe as resolved ignores loopback ifaces, hence never will have
per-link servers on ifindex 1.
Note that this splits up the "with_ifindex" parameter into a second
parameter "only_global", since they semantically do two different
things. One controls whether we shall expect/parse an ifindex dbus
field. The other controls whether we shall filter all ifindex values set
!= 0. These are effectively always used in conjunction hence making them
the same actually worked. However this is utterly confusing I think,
which as I guess is resulting in the confusion around #25796 (which
removes the whole check)
(cherry picked from commit 889a1b9f4e799b31f1be06db74708aa8beb70829)
Resolves: #2161260
---
src/resolve/resolvectl.c | 30 +++++++++++++++---------------
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/src/resolve/resolvectl.c b/src/resolve/resolvectl.c
index 1cb16430e4..e22e06d054 100644
--- a/src/resolve/resolvectl.c
+++ b/src/resolve/resolvectl.c
@@ -1205,7 +1205,13 @@ static int reset_server_features(int argc, char **argv, void *userdata) {
return 0;
}
-static int read_dns_server_one(sd_bus_message *m, bool with_ifindex, bool extended, char **ret) {
+static int read_dns_server_one(
+ sd_bus_message *m,
+ bool with_ifindex, /* read "ifindex" reply that also carries an interface index */
+ bool extended, /* read "extended" reply, i.e. with port number and server name */
+ bool only_global, /* suppress entries with an (non-loopback) ifindex set (i.e. which are specific to some interface) */
+ char **ret) {
+
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_cleanup_free_ char *pretty = NULL;
union in_addr_union a;
@@ -1255,8 +1261,8 @@ static int read_dns_server_one(sd_bus_message *m, bool with_ifindex, bool extend
return 1;
}
- if (with_ifindex && ifindex != 0) {
- /* only show the global ones here */
+ if (only_global && ifindex > 0 && ifindex != LOOPBACK_IFINDEX) {
+ /* This one has an (non-loopback) ifindex set, and we were told to suppress those. Hence do so. */
*ret = NULL;
return 1;
}
@@ -1284,7 +1290,7 @@ static int map_link_dns_servers_internal(sd_bus *bus, const char *member, sd_bus
for (;;) {
_cleanup_free_ char *pretty = NULL;
- r = read_dns_server_one(m, false, extended, &pretty);
+ r = read_dns_server_one(m, /* with_ifindex= */ false, extended, /* only_global= */ false, &pretty);
if (r < 0)
return r;
if (r == 0)
@@ -1317,14 +1323,14 @@ static int map_link_current_dns_server(sd_bus *bus, const char *member, sd_bus_m
assert(m);
assert(userdata);
- return read_dns_server_one(m, false, false, userdata);
+ return read_dns_server_one(m, /* with_ifindex= */ false, /* extended= */ false, /* only_global= */ false, userdata);
}
static int map_link_current_dns_server_ex(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
assert(m);
assert(userdata);
- return read_dns_server_one(m, false, true, userdata);
+ return read_dns_server_one(m, /* with_ifindex= */ false, /* extended= */ true, /* only_global= */ false, userdata);
}
static int read_domain_one(sd_bus_message *m, bool with_ifindex, char **ret) {
@@ -1756,7 +1762,7 @@ static int map_global_dns_servers_internal(
for (;;) {
_cleanup_free_ char *pretty = NULL;
- r = read_dns_server_one(m, true, extended, &pretty);
+ r = read_dns_server_one(m, /* with_ifindex= */ true, extended, /* only_global= */ true, &pretty);
if (r < 0)
return r;
if (r == 0)
@@ -1786,17 +1792,11 @@ static int map_global_dns_servers_ex(sd_bus *bus, const char *member, sd_bus_mes
}
static int map_global_current_dns_server(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
- assert(m);
- assert(userdata);
-
- return read_dns_server_one(m, true, false, userdata);
+ return read_dns_server_one(m, /* with_ifindex= */ true, /* extended= */ false, /* only_global= */ true, userdata);
}
static int map_global_current_dns_server_ex(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
- assert(m);
- assert(userdata);
-
- return read_dns_server_one(m, true, true, userdata);
+ return read_dns_server_one(m, /* with_ifindex= */ true, /* extended= */ true, /* only_global= */ true, userdata);
}
static int map_global_domains(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {