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RRTcodebaseC

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========================================================== */
int ret_chat_id = 0;
int ongoing_allocated = 0;
uint32_t contact_chat_id = 0;
int join_vg = 0;
dc_lot_t* qr_scan = NULL;
int qr_locked = 0;
#define LOCK_QR { pthread_mutex_lock(&context->bobs_qr_critical); qr_locked = 1; }
#define UNLOCK_QR if (qr_locked) { pthread_mutex_unlock(&context->bobs_qr_critical); qr_locked = 0; }
#define CHECK_EXIT if (context->shall_stop_ongoing) { goto cleanup; }
dc_log_info(context, 0, "Requesting secure-join ...");
dc_ensure_secret_key_exists(context);
if ((ongoing_allocated=dc_alloc_ongoing(context))==0) {
goto cleanup;
}
if (((qr_scan=dc_check_qr(context, qr))==NULL)
|| (qr_scan->state!=DC_QR_ASK_VERIFYCONTACT && qr_scan->state!=DC_QR_ASK_VERIFYGROUP)) {
dc_log_error(context, 0, "Unknown QR code.");
goto cleanup;
}
if ((contact_chat_id=dc_create_chat_by_contact_id(context, qr_scan->id))==0) {
dc_log_error(context, 0, "Unknown contact.");
goto cleanup;
}
CHECK_EXIT
join_vg = (qr_scan->state==DC_QR_ASK_VERIFYGROUP);
context->bobs_status = 0;
LOCK_QR
context->bobs_qr_scan = qr_scan;
UNLOCK_QR
if (fingerprint_equals_sender(context, qr_scan->fingerprint, contact_chat_id)) {
// the scanned fingerprint matches Alice's key, we can proceed to step 4b) directly and save two mails
dc_log_info(context, 0, "Taking protocol shortcut.");
context->bob_expects = DC_VC_CONTACT_CONFIRM;
context->cb(context, DC_EVENT_SECUREJOIN_JOINER_PROGRESS, chat_id_2_contact_id(context, contact_chat_id), 400);
char* own_fingerprint = get_self_fingerprint(context);
send_handshake_msg(context, contact_chat_id, join_vg? "vg-request-with-auth" : "vc-request-with-auth",
qr_scan->auth, own_fingerprint, join_vg? qr_scan->text2 : NULL); // Bob -> Alice
free(own_fingerprint);
}
else {
context->bob_expects = DC_VC_AUTH_REQUIRED;
send_handshake_msg(context, contact_chat_id, join_vg? "vg-request" : "vc-request",
qr_scan->invitenumber, NULL, NULL); // Bob -> Alice
}
while (1) {
CHECK_EXIT
usleep(300*1000); // 0.3 seconds
}
cleanup:
context->bob_expects = 0;
if (context->bobs_status==DC_BOB_SUCCESS) {
if (join_vg) {
ret_chat_id = dc_get_chat_id_by_grpid(context, qr_scan->text2, NULL, NULL);
}
else {
ret_chat_id = contact_chat_id;
}
}
LOCK_QR
context->bobs_qr_scan = NULL;
UNLOCK_QR
dc_lot_unref(qr_scan);
if (ongoing_allocated) { dc_free_ongoing(context); }
return ret_chat_id;
}
/**
* Handle incoming handshake messages. Called from receive_imf().
* Assume, when dc_handle_securejoin_handshake() is called, the message is not yet filed in the database.
*
* @private @memberof dc_context_t
* @param context The context object.
* @param mimeparser The mail.
* @param contact_id Contact-id of the sender (typically the From: header)
* @return bitfield of DC_HANDSHAKE_STOP_NORMAL_PROCESSING, DC_HANDSHAKE_CONTINUE_NORMAL_PROCESSING, DC_HANDSHAKE_ADD_DELETE_JOB;
* 0 if the message is no secure join message
*/
int dc_handle_securejoin_handshake(dc_context_t* context, dc_mimeparser_t* mimeparser, uint32_t contact_id)
{
int qr_locked = 0;
const char* step = NULL;