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authorDavid Herrmann <dh.herrmann@gmail.com>2015-08-27 16:43:02 +0200
committerDavid Herrmann <dh.herrmann@gmail.com>2015-08-27 16:43:02 +0200
commit154429127cb400bf010d41d7dd3ba4ec41b9ffb3 (patch)
tree769936fe9ef9021d941ce3d64d8c849b66a7b7cb /src/libsystemd
parent057171efc103ac76c60a2a0d277d8bbf25415c21 (diff)
sd-bus: do not connect to dbus-1 socket when kdbus is available
We should not fall back to dbus-1 and connect to the proxy when kdbus returns an error that indicates that kdbus is running but just does not accept new connections because of quota limits or something similar. Based on a patch by Kay.
Diffstat (limited to 'src/libsystemd')
-rw-r--r--src/libsystemd/sd-bus/sd-bus.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c
index 5434d62af5..5285278d92 100644
--- a/src/libsystemd/sd-bus/sd-bus.c
+++ b/src/libsystemd/sd-bus/sd-bus.c
@@ -1002,6 +1002,8 @@ static int bus_parse_next_address(sd_bus *b) {
}
static int bus_start_address(sd_bus *b) {
+ bool container_kdbus_available = false;
+ bool kdbus_available = false;
int r;
assert(b);
@@ -1011,15 +1013,29 @@ static int bus_start_address(sd_bus *b) {
bus_close_fds(b);
+ /*
+ * Usually, if you provide multiple different bus-addresses, we
+ * try all of them in order. We use the first one that
+ * succeeds. However, if you mix kernel and unix addresses, we
+ * never try unix-addresses if a previous kernel address was
+ * tried and kdbus was available. This is required to prevent
+ * clients to fallback to the bus-proxy if kdbus is available
+ * but failed (eg., too many connections).
+ */
+
if (b->exec_path)
r = bus_socket_exec(b);
- else if ((b->nspid > 0 || b->machine) && b->kernel)
+ else if ((b->nspid > 0 || b->machine) && b->kernel) {
r = bus_container_connect_kernel(b);
- else if ((b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
+ if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
+ container_kdbus_available = true;
+ } else if (!container_kdbus_available && (b->nspid > 0 || b->machine) && b->sockaddr.sa.sa_family != AF_UNSPEC)
r = bus_container_connect_socket(b);
- else if (b->kernel)
+ else if (b->kernel) {
r = bus_kernel_connect(b);
- else if (b->sockaddr.sa.sa_family != AF_UNSPEC)
+ if (r < 0 && !IN_SET(r, -ENOENT, -ESOCKTNOSUPPORT))
+ kdbus_available = true;
+ } else if (!kdbus_available && b->sockaddr.sa.sa_family != AF_UNSPEC)
r = bus_socket_connect(b);
else
skipped = true;