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sspc: handle loss of proxy manifesting itself as 0 length rx

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If the client library loses the proxy connection, it can receive
an endless stream of 0 length rx instead of understanding that
the UDS peer has gone.

Handle that correctly so the client reacts to the loss of the
proxy link by trying to reacquire it.

Adapt the sspc state to be suitable for retry in that case,
by dropping any dsh and letting the logical ss know that he
is DISCONNECTED, if he thought he was CONNECTED.
This commit is contained in:
Andy Green 2021-02-25 21:22:06 +00:00
parent ddf24783b3
commit 789d98b98b
1 changed files with 13 additions and 0 deletions
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13
lib/secure-streams/secure-streams-client.c
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@ -178,6 +178,13 @@ callback_sspc_client(struct lws *wsi, enum lws_callback_reasons reason,
lwsl_info("%s: LWS_CALLBACK_RAW_CLOSE: %s proxy conn down, sspc h %s\n",
__func__, lws_wsi_tag(wsi), lws_sspc_tag(h));
if (h) {
lws_dsh_destroy(&h->dsh);
if (h->ss_dangling_connected && h->ssi.state) {
lwsl_notice("%s: setting _DISCONNECTED\n", __func__);
h->ss_dangling_connected = 0;
h->prev_ss_state = LWSSSCS_DISCONNECTED;
h->ssi.state(ss_to_userobj(h), NULL, LWSSSCS_DISCONNECTED, 0);
}
h->cwsi = NULL;
/*
* schedule a reconnect in 1s
@ -200,6 +207,12 @@ callback_sspc_client(struct lws *wsi, enum lws_callback_reasons reason,
return -1;
}
if (!len) {
lwsl_notice("%s: RAW_RX: zero len\n", __func__);
return -1;
}
n = lws_ss_deserialize_parse(&h->parser, lws_get_context(wsi),
h->dsh, in, len, &h->state, h,
(lws_ss_handle_t **)m, &h->ssi, 1);