Method SendPacket

src/network/core/udp.cpp:74–107

* Send a packet over UDP * @param p the packet to send * @param recv the receiver (target) of the packet * @param all send the packet using all sockets that can send it * @param broadcast whether to send a broadcast message */

 * @param broadcast whether to send a broadcast message
 */
void NetworkUDPSocketHandler::SendPacket(Packet &p, NetworkAddress &recv, bool all, bool broadcast)
{
	if (this->sockets.empty()) this->Listen();

	for (auto &s : this->sockets) {
		/* Make a local copy because if we resolve it we cannot
		 * easily unresolve it so we can resolve it later again. */
		NetworkAddress send(recv);

		/* Not the same type */
		if (!send.IsFamily(s.second.GetAddress()->ss_family)) continue;

		p.PrepareToSend();

		if (broadcast) {
			/* Enable broadcast */
			unsigned long val = 1;
			if (setsockopt(s.first, SOL_SOCKET, SO_BROADCAST, (char *) &val, sizeof(val)) < 0) {
				Debug(net, 1, "Setting broadcast mode failed: {}", NetworkError::GetLast().AsString());
			}
		}

		/* Send the buffer */
		ssize_t res = p.TransferOut([&](std::span<const uint8_t> buffer) {
			return sendto(s.first, reinterpret_cast<const char *>(buffer.data()), static_cast<int>(buffer.size()), 0, reinterpret_cast<const struct sockaddr *>(send.GetAddress()), send.GetAddressLength());
		});
		Debug(net, 7, "sendto({})", send.GetAddressAsString());

		/* Check for any errors, but ignore it otherwise */
		if (res == -1) Debug(net, 1, "sendto({}) failed: {}", send.GetAddressAsString(), NetworkError::GetLast().AsString());

		if (!all) break;
	}
}

/**
 * Receive a packet at UDP level