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WPS: Use a dummy WSC_ACK as WLANEvent as the initial event if needed

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UPnP device architecture specification requires all evented variables to
be included in the initial event message after subscription. Since this
can happen before we have seen any events, generated a dummy event
(WSC_ACK with all-zeros nonces) if needed.
This commit is contained in:
Jouni Malinen 2009-11-15 01:11:28 +02:00
parent 44577e4c2e
commit fcac668faa
1 changed files with 43 additions and 3 deletions
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46
src/wps/wps_upnp.c
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@ -47,9 +47,6 @@
* -- Needs renaming with module prefix to avoid polluting the debugger
* namespace and causing possible collisions with other static fncs
* and structure declarations when using the debugger.
* -- Just what should be in the first event message sent after subscription
* for the WLANEvent field? If i pass it empty, Vista replies with OK
* but apparently barfs on the message.
* -- The http error code generation is pretty bogus, hopefully noone cares.
*
* Author: Ted Merrill, Atheros Communications, based upon earlier work
@ -641,6 +638,27 @@ struct subscription * subscription_find(struct upnp_wps_device_sm *sm,
}
static struct wpabuf * build_fake_wsc_ack(void)
{
struct wpabuf *msg = wpabuf_alloc(100);
if (msg == NULL)
return NULL;
wpabuf_put_u8(msg, UPNP_WPS_WLANEVENT_TYPE_EAP);
wpabuf_put_str(msg, "00:00:00:00:00:00");
wps_build_version(msg);
wps_build_msg_type(msg, WPS_WSC_ACK);
/* Enrollee Nonce */
wpabuf_put_be16(msg, ATTR_ENROLLEE_NONCE);
wpabuf_put_be16(msg, WPS_NONCE_LEN);
wpabuf_put(msg, WPS_NONCE_LEN);
/* Registrar Nonce */
wpabuf_put_be16(msg, ATTR_REGISTRAR_NONCE);
wpabuf_put_be16(msg, WPS_NONCE_LEN);
wpabuf_put(msg, WPS_NONCE_LEN);
return msg;
}
/* subscription_first_event -- send format/queue event that is automatically
* sent on a new subscription.
*/
@ -665,6 +683,28 @@ static int subscription_first_event(struct subscription *s)
const char *tail = "</e:propertyset>\n";
char txt[10];
if (s->sm->wlanevent == NULL) {
/*
* There has been no events before the subscription. However,
* UPnP device architecture specification requires all the
* evented variables to be included, so generate a dummy event
* for this particular case using a WSC_ACK and all-zeros
* nonces. The ER (UPnP control point) will ignore this, but at
* least it will learn that WLANEvent variable will be used in
* event notifications in the future.
*/
struct wpabuf *msg;
wpa_printf(MSG_DEBUG, "WPS UPnP: Use a fake WSC_ACK as the "
"initial WLANEvent");
msg = build_fake_wsc_ack();
if (msg) {
s->sm->wlanevent = (char *)
base64_encode(wpabuf_head(msg),
wpabuf_len(msg), NULL);
wpabuf_free(msg);
}
}
wlan_event = s->sm->wlanevent;
if (wlan_event == NULL || *wlan_event == '\0') {
wpa_printf(MSG_DEBUG, "WPS UPnP: WLANEvent not known for "