Example #1
0
int FileTransferProtocol::recvFilename(net::Socket &s, string &filename) {
	int bytes_received;

	// First, receive the filename size (3 bytes ascii-encoded unsigned integer)
	char buf[3];
	bytes_received = s.recv(buf, 3, 0);
	if (bytes_received == SOCKET_ERROR || bytes_received != 3) {
		onTransferError("Could not receive filename header size!");
		return -1;
	}

	// Try to parse what we have received
	size_t len;
	if (EOF == sscanf_s(buf, "%3lu", &len)) {
		onTransferError("Could not parse filename header size!");
		return -1;
	}

	// Finally, allocate a string and receive the filename
	char *nameBuf = (char*)malloc(len + 1);
	nameBuf[len] = '\0';
	bytes_received = s.recv(nameBuf, len, 0);
	if (bytes_received == SOCKET_ERROR || bytes_received != len) {
		free(nameBuf);
		onTransferError("Could not receive filename header!");
	}

	filename = string(nameBuf);
	free(nameBuf);
	return 0;
}
Example #2
0
int FileTransferProtocol::waitForAck(net::Socket &s, string errmsg) {
	char ackbuf[4] = "   "; // Either ACK or ERR
	int bytes_received = s.recv(ackbuf, 3, 0);
	if (bytes_received == SOCKET_ERROR || bytes_received != 3 || strcmp(ackbuf, "ERR") == 0) {
		onTransferError(errmsg);
		return -1;
	}
	return 0;
}
Example #3
0
int FileTransferProtocol::recvCommand(net::Socket &s, char &command) {
	char d;
	int bytes_received;
	bytes_received = s.recv(&d, 1, 0);
	if (bytes_received == SOCKET_ERROR || bytes_received != 1) {
		onTransferError("Could not receive direction from client!");
		return -1;
	}
	if (d != 'D' && d != 'U' && d != 'L' && d != 'Q') {
		onTransferError("Client sent invalid direction!");
		return -1;
	}
	command = d;
	return 0;
}
Example #4
0
size_t StreamSocketReceiver::receiveHeader(net::Socket &s)
{
	char buf[20];
	size_t bytes_received;
	if (bytes_received = s.recv(buf, 20) != 20) {
		throw IncompleteReceiveException(bytes_received, 20);
	}

	// Try to parse length of payload in header
	size_t len;
	if (EOF == sscanf_s(buf, "%20lu", &len)) {
		throw UnparseableHeaderException(buf);
	}
	return len;
}
Example #5
0
void StreamSocketReceiver::receivePayload(net::Socket &s, ostream &stream, size_t len)
{
	void *buf = malloc(this->packet_size);
	size_t bytes_read = 0;
	while (bytes_read < len) {
		size_t exp_bytes = min(this->packet_size, len - bytes_read);
		size_t bytes_recv = s.recv((char*)buf, exp_bytes);
		if (bytes_recv != exp_bytes) {
			free(buf);
			throw IncompleteReceiveException(bytes_read + bytes_recv, len);
		}
		bytes_read += bytes_recv;
		stream.write((char*)buf, bytes_recv);
	}
	free(buf);
}