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msgpack_rpc: Fix crash in log_server_msg

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It appears that used msgpack library is not able to parse back message created 
by msgpack_rpc_from_object() if nesting level is too high, so log_server_msg now 
cares about msgpack_unpack_next() return value. Also error message from 
server_notifications_spec.lua is not readable if something is wrong (though at 
least now it does not crash when parsing deeply nested structures).

log_server_msg() in the test reports

    [msgpack-rpc] nvim -> client(1) [error]        "parse error"
This commit is contained in:
ZyX 2016-06-11 21:59:01 +03:00
parent 2968dc7bdd
commit 0d56118d86
2 changed files with 64 additions and 13 deletions
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39
src/nvim/msgpack_rpc/channel.c
View File

@ -816,20 +816,55 @@ static void decref(Channel *channel)
#define REQ "[request] "
#define RES "[response] "
#define NOT "[notification] "
#define ERR "[error] "
// Cannot define array with negative offsets, so this one is needed to be added
// to MSGPACK_UNPACK_\* values.
#define MUR_OFF 2
static const char *const msgpack_error_messages[] = {
[MSGPACK_UNPACK_EXTRA_BYTES + MUR_OFF] = "extra bytes found",
[MSGPACK_UNPACK_CONTINUE + MUR_OFF] = "incomplete string",
[MSGPACK_UNPACK_PARSE_ERROR + MUR_OFF] = "parse error",
[MSGPACK_UNPACK_NOMEM_ERROR + MUR_OFF] = "not enough memory",
};
static void log_server_msg(uint64_t channel_id,
msgpack_sbuffer *packed)
{
msgpack_unpacked unpacked;
msgpack_unpacked_init(&unpacked);
msgpack_unpack_next(&unpacked, packed->data, packed->size, NULL);
uint64_t type = unpacked.data.via.array.ptr[0].via.u64;
DLOGN("[msgpack-rpc] nvim -> client(%" PRIu64 ") ", channel_id);
const msgpack_unpack_return result =
msgpack_unpack_next(&unpacked, packed->data, packed->size, NULL);
switch (result) {
case MSGPACK_UNPACK_SUCCESS: {
uint64_t type = unpacked.data.via.array.ptr[0].via.u64;
log_lock();
FILE *f = open_log_file();
fprintf(f, type ? (type == 1 ? RES : NOT) : REQ);
log_msg_close(f, unpacked.data);
msgpack_unpacked_destroy(&unpacked);
break;
}
case MSGPACK_UNPACK_EXTRA_BYTES:
case MSGPACK_UNPACK_CONTINUE:
case MSGPACK_UNPACK_PARSE_ERROR:
case MSGPACK_UNPACK_NOMEM_ERROR: {
log_lock();
FILE *f = open_log_file();
fprintf(f, ERR);
log_msg_close(f, (msgpack_object) {
.type = MSGPACK_OBJECT_STR,
.via.str = {
.ptr = (char *) msgpack_error_messages[result + MUR_OFF],
.size = (uint32_t) strlen(
msgpack_error_messages[result + MUR_OFF]),
},
});
break;
}
}
}
static void log_client_msg(uint64_t channel_id,

28
test/functional/api/server_notifications_spec.lua
View File

@ -41,13 +41,29 @@ describe('notify', function()
it('does not crash for deeply nested variable', function()
meths.set_var('l', {})
local nest_level = 1000
meths.command(('call map(range(%u), "extend(g:, {\'l\': [g:l]})")'):format(nest_level))
local ret = {}
for i = 1, nest_level do
ret = {ret}
end
meths.command(('call map(range(%u), "extend(g:, {\'l\': [g:l]})")'):format(nest_level - 1))
eval('rpcnotify('..channel..', "event", g:l)')
-- eq({'notification', 'event', ret}, next_message())
local msg = next_message()
eq('notification', msg[1])
eq('event', msg[2])
local act_ret = msg[3]
local act_nest_level = 0
while act_ret do
if type(act_ret) == 'table' then
local cur_act_ret = nil
for k, v in pairs(act_ret) do
eq(1, k)
cur_act_ret = v
end
if cur_act_ret then
act_nest_level = act_nest_level + 1
end
act_ret = cur_act_ret
else
eq(nil, act_ret)
end
end
eq(nest_level, act_nest_level)
end)
end)
end)