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only allow single connection to SDP server

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This commit is contained in:
matthias.ringwald 2011-07-08 18:38:36 +00:00
parent 5b9a35f8fb
commit 3c2c944968
1 changed files with 51 additions and 9 deletions
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58
src/sdp.c
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@ -49,6 +49,9 @@
// max reserved ServiceRecordHandle
#define maxReservedServiceRecordHandle 0xffff
// max SDP response
#define SDP_RESPONSE_BUFFER_SIZE (HCI_ACL_3DH5_SIZE-HCI_ACL_DATA_PKT_HDR)
static void sdp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
// registered service records
@ -58,14 +61,16 @@ static linked_list_t sdp_service_records = NULL;
static uint32_t sdp_next_service_record_handle = maxReservedServiceRecordHandle + 2;
// AttributeIDList used to remove ServiceRecordHandle
const uint8_t removeServiceRecordHandleAttributeIDList[] = { 0x36, 0x00, 0x05, 0x0A, 0x00, 0x01, 0xFF, 0xFF };
static const uint8_t removeServiceRecordHandleAttributeIDList[] = { 0x36, 0x00, 0x05, 0x0A, 0x00, 0x01, 0xFF, 0xFF };
#define SDP_RESPONSE_BUFFER_SIZE HCI_ACL_3DH5_SIZE
static uint8_t sdp_response_buffer[SDP_RESPONSE_BUFFER_SIZE];
static void (*app_packet_handler)(void * connection, uint8_t packet_type,
uint16_t channel, uint8_t *packet, uint16_t size) = NULL;
static uint16_t l2cap_cid = 0;
static uint16_t sdp_response_size = 0;
void sdp_init(){
// register with l2cap psm sevices
l2cap_register_service_internal(NULL, sdp_packet_handler, PSM_SDP, 1000);
@ -75,6 +80,7 @@ void sdp_init(){
void sdp_register_packet_handler(void (*handler)(void * connection, uint8_t packet_type,
uint16_t channel, uint8_t *packet, uint16_t size)){
app_packet_handler = handler;
l2cap_cid = 0;
}
uint32_t sdp_get_service_record_handle(uint8_t * record){
@ -555,12 +561,21 @@ int sdp_handle_service_search_attribute_request(uint8_t * packet, uint16_t remot
return pos;
}
static void sdp_try_respond(void){
if (!sdp_response_size ) return;
if (!l2cap_cid) return;
if (!l2cap_can_send_packet_now(l2cap_cid)) return;
l2cap_send_internal(l2cap_cid, sdp_response_buffer, sdp_response_size);
sdp_response_size = 0;
}
// we assume that we don't get two requests in a row
static void sdp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
uint16_t transaction_id;
SDP_PDU_ID_t pdu_id;
uint16_t param_len;
uint16_t remote_mtu;
int pos = 5;
switch (packet_type) {
@ -578,22 +593,24 @@ static void sdp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *p
switch (pdu_id){
case SDP_ServiceSearchRequest:
pos = sdp_handle_service_search_request(packet, remote_mtu);
sdp_response_size = sdp_handle_service_search_request(packet, remote_mtu);
break;
case SDP_ServiceAttributeRequest:
pos = sdp_handle_service_attribute_request(packet, remote_mtu);
sdp_response_size = sdp_handle_service_attribute_request(packet, remote_mtu);
break;
case SDP_ServiceSearchAttributeRequest:
pos = sdp_handle_service_search_attribute_request(packet, remote_mtu);
sdp_response_size = sdp_handle_service_search_attribute_request(packet, remote_mtu);
break;
default:
pos = sdp_create_error_response(transaction_id, 0x0003); // invalid syntax
sdp_response_size = sdp_create_error_response(transaction_id, 0x0003); // invalid syntax
break;
}
l2cap_send_internal(channel, sdp_response_buffer, pos);
sdp_try_respond();
break;
case HCI_EVENT_PACKET:
@ -601,10 +618,35 @@ static void sdp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *p
switch (packet[0]) {
case L2CAP_EVENT_INCOMING_CONNECTION:
if (l2cap_cid) {
// CONNECTION REJECTED DUE TO LIMITED RESOURCES
l2cap_decline_connection_internal(channel, 0x0d);
break;
}
// accept
l2cap_cid = channel;
sdp_response_size = 0;
l2cap_accept_connection_internal(channel);
break;
case L2CAP_EVENT_CHANNEL_OPENED:
if (packet[2]) {
// open failed -> reset
l2cap_cid = 0;
}
break;
case L2CAP_EVENT_CREDITS:
sdp_try_respond();
break;
case L2CAP_EVENT_CHANNEL_CLOSED:
if (channel == l2cap_cid){
// reset
l2cap_cid = 0;
}
break;
default:
// other event
break;