diff options
| author | David Herrmann <dh.herrmann@gmail.com> | 2015-07-06 17:43:36 +0200 |
|---|---|---|
| committer | David Herrmann <dh.herrmann@gmail.com> | 2015-07-06 17:45:33 +0200 |
| commit | e1141a962239ef9ad2383a7f57ff151597a2b982 (patch) | |
| tree | a2b555c73f5d75e0d8257d000b5b9d2a5a41f6e6 | |
| parent | bf09cec3da7c968eaf3ef57bed7bf60eb2940953 (diff) | |
sd-bus: support matching on destination names
Right now, we never install destination matches on kdbus as the kernel did
not support MATCH rules on those. With the introduction of
KDBUS_ITEM_DST_ID we can now match on destination IDs, so add explicit
support for those.
This requires a recent kdbus module to work. However, there seems to be no
user-space that uses "Destination=''" matches, yet, so old kdbus modules
still work fine (we couldn't find any real user).
This is needed to match on unicast signals in bus-proxy. A followup will
add support for this.
| -rw-r--r-- | src/libsystemd/sd-bus/bus-control.c | 29 | ||||
| -rw-r--r-- | src/libsystemd/sd-bus/kdbus.h | 1 |
2 files changed, 23 insertions, 7 deletions
diff --git a/src/libsystemd/sd-bus/bus-control.c b/src/libsystemd/sd-bus/bus-control.c index 7a59702cb2..a38c5c50fc 100644 --- a/src/libsystemd/sd-bus/bus-control.c +++ b/src/libsystemd/sd-bus/bus-control.c @@ -1219,7 +1219,7 @@ int bus_add_match_internal_kernel( size_t sz; const char *sender = NULL; size_t sender_length = 0; - uint64_t src_id = KDBUS_MATCH_ID_ANY; + uint64_t src_id = KDBUS_MATCH_ID_ANY, dst_id = KDBUS_MATCH_ID_ANY; bool using_bloom = false; unsigned i; bool matches_name_change = true; @@ -1332,13 +1332,21 @@ int bus_add_match_internal_kernel( break; } - case BUS_MATCH_DESTINATION: - /* The bloom filter does not include - the destination, since it is only - available for broadcast messages - which do not carry a destination - since they are undirected. */ + case BUS_MATCH_DESTINATION: { + /* + * Kernel only supports matching on destination IDs, but + * not on destination names. So just skip the + * destination name restriction and verify it in + * user-space on retrieval. + */ + r = bus_kernel_parse_unique_name(c->value_str, &dst_id); + if (r < 0) + return r; + else if (r > 0) + sz += ALIGN8(offsetof(struct kdbus_item, id) + sizeof(uint64_t)); + break; + } case BUS_MATCH_ROOT: case BUS_MATCH_VALUE: @@ -1365,6 +1373,13 @@ int bus_add_match_internal_kernel( item = KDBUS_ITEM_NEXT(item); } + if (dst_id != KDBUS_MATCH_ID_ANY) { + item->size = offsetof(struct kdbus_item, id) + sizeof(uint64_t); + item->type = KDBUS_ITEM_DST_ID; + item->id = dst_id; + item = KDBUS_ITEM_NEXT(item); + } + if (using_bloom) { item->size = offsetof(struct kdbus_item, data64) + bus->bloom_size; item->type = KDBUS_ITEM_BLOOM_MASK; diff --git a/src/libsystemd/sd-bus/kdbus.h b/src/libsystemd/sd-bus/kdbus.h index 00a6e142c9..ecffc6b13c 100644 --- a/src/libsystemd/sd-bus/kdbus.h +++ b/src/libsystemd/sd-bus/kdbus.h @@ -374,6 +374,7 @@ enum kdbus_item_type { KDBUS_ITEM_ATTACH_FLAGS_RECV, KDBUS_ITEM_ID, KDBUS_ITEM_NAME, + KDBUS_ITEM_DST_ID, /* keep these item types in sync with KDBUS_ATTACH_* flags */ _KDBUS_ITEM_ATTACH_BASE = 0x1000, |