SOSCoderRef SOSCoderCreateFromData(CFDataRef exportedData, CFErrorRef *error) {
SOSCoderRef p = calloc(1, sizeof(struct __OpaqueSOSCoder));
const uint8_t *der = CFDataGetBytePtr(exportedData);
const uint8_t *der_end = der + CFDataGetLength(exportedData);
CFDataRef otr_data = NULL;
ccder_tag tag;
require(ccder_decode_tag(&tag, der, der_end),fail);
switch (tag) {
case CCDER_OCTET_STRING: // TODO: this code is safe to delete?
{
der = der_decode_data(kCFAllocatorDefault, 0, &otr_data, error, der, der_end);
p->waitingForDataPacket = false;
}
break;
case CCDER_CONSTRUCTED_SEQUENCE:
{
const uint8_t *sequence_end = NULL;
der = ccder_decode_sequence_tl(&sequence_end, der, der_end);
require_action_quiet(sequence_end == der_end, fail, SecCFDERCreateError(kSOSErrorDecodeFailure, CFSTR("Extra data in SOS coder"), NULL, error));
der = der_decode_data(kCFAllocatorDefault, 0, &otr_data, error, der, sequence_end);
der = der_decode_bool(&p->waitingForDataPacket, der, sequence_end);
if (der != sequence_end) { // optionally a pending response
der = der_decode_data(kCFAllocatorDefault, 0, &p->pendingResponse, error, der, sequence_end);
}
}
break;
default:
SecCFDERCreateError(kSOSErrorDecodeFailure, CFSTR("Unsupported SOS Coder DER"), NULL, error);
goto fail;
}
require(der, fail);
p->sessRef = SecOTRSessionCreateFromData(NULL, otr_data);
require(p->sessRef, fail);
CFReleaseSafe(otr_data);
return p;
fail:
SOSCoderDispose(p);
CFReleaseSafe(otr_data);
return NULL;
}
bool SOSTransportMessageSendMessageIfNeeded(SOSTransportMessageRef transport, CFStringRef circle_id, CFStringRef peer_id, CFErrorRef *error) {
SOSEnginePeerMessageSentBlock sent = NULL;
CFDataRef message_to_send = NULL;
bool ok = false;
SOSPeerRef peer = SOSPeerCreateWithEngine(SOSTransportMessageGetEngine(transport), peer_id);
CFDataRef coderData = SOSEngineGetCoderData(SOSTransportMessageGetEngine(transport), peer_id);
require(coderData, fail);
SOSCoderRef coder = SOSCoderCreateFromData(coderData, error);
require(coder, fail);
SOSPeerSetCoder(peer, coder);
ok = SOSPeerCoderSendMessageIfNeeded(peer, &message_to_send, circle_id, peer_id, &sent, error);
coder = SOSPeerGetCoder(peer);
if (message_to_send) {
CFDictionaryRef peer_dict = CFDictionaryCreateForCFTypes(kCFAllocatorDefault,
peer_id, message_to_send,
NULL);
CFDictionaryRef circle_peers = CFDictionaryCreateForCFTypes(kCFAllocatorDefault,
circle_id, peer_dict,
NULL);
ok = ok && SOSTransportMessageSendMessages(transport, circle_peers, error);
SOSPeerCoderConsume(&sent, ok);
CFReleaseSafe(peer_dict);
CFReleaseSafe(circle_peers);
}
Block_release(sent);
CFReleaseSafe(message_to_send);
coderData = SOSCoderCopyDER(coder, error);
if(!SOSEngineSetCoderData(SOSTransportMessageGetEngine(transport), peer_id, coderData, error)){
secerror("SOSTransportMessageSendMessageIfNeeded, Could not save peer state");
}
CFReleaseNull(coderData);
if (coder)
SOSCoderDispose(coder);
fail:
CFReleaseNull(peer);
return ok;
}
