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bus: fix arg0path= two-way matching

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DBus spec clearly defines arg0path= to be a two-way matching. That is,
either the matcher or the matchee can be a prefix of the other to match.
This is not possible to implement with bloom-filters. Instead, we'd have
to add a separate filter for each prefix. This is non-trivial, though.
Hence, just skip the match for now and match locally.
This commit is contained in:
David Herrmann 2015-06-10 20:04:53 +02:00
parent 7cd4dbe9ca
commit a867b00226
1 changed files with 12 additions and 5 deletions
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17
src/libsystemd/sd-bus/bus-control.c
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@ -1310,11 +1310,18 @@ int bus_add_match_internal_kernel(
}
case BUS_MATCH_ARG_PATH...BUS_MATCH_ARG_PATH_LAST: {
char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")];
xsprintf(buf, "arg%i-slash-prefix", c->type - BUS_MATCH_ARG_PATH);
bloom_add_pair(bloom, bus->bloom_size, bus->bloom_n_hash, buf, c->value_str);
using_bloom = true;
/*
* XXX: DBus spec defines arg[0..63]path= matching to be
* a two-way glob. That is, if either string is a prefix
* of the other, it matches.
* This is really hard to realize in bloom-filters, as
* we would have to create a bloom-match for each prefix
* of @c->value_str. This is excessive, hence we just
* ignore all those matches and accept everything from
* the kernel. People should really avoid those matches.
* If they're used in real-life some day, we will have
* to properly support multiple-matches here.
*/
break;
}