/**
* @brief Send the servers list to the specified client address.
*/
static void Ms_GetServers(struct sockaddr_in *from) {
mem_buf_t buf;
byte buffer[0xffff];
Mem_InitBuffer(&buf, buffer, sizeof(buffer));
const char *servers = "\xFF\xFF\xFF\xFF" "servers ";
Mem_WriteBuffer(&buf, servers, strlen(servers));
uint32_t i = 0;
GList *s = ms_servers;
while (s) {
const ms_server_t *server = (ms_server_t *) s->data;
if (server->validated) {
Mem_WriteBuffer(&buf, &server->addr.sin_addr, sizeof(server->addr.sin_addr));
Mem_WriteBuffer(&buf, &server->addr.sin_port, sizeof(server->addr.sin_port));
i++;
}
s = s->next;
}
if ((sendto(ms_sock, buf.data, buf.size, 0, (struct sockaddr *) from, sizeof(*from))) == -1) {
Com_Warn("%s: %s\n", atos(from), strerror(errno));
} else {
Com_Verbose("Sent %d servers to %s\n", i, atos(from));
}
}
/*
* @brief Sends an out-of-band datagram
*/
void Netchan_OutOfBand(int32_t sock, const net_addr_t *addr, const void *data, size_t len) {
mem_buf_t send;
byte send_buffer[MAX_MSG_SIZE];
// write the packet header
Mem_InitBuffer(&send, send_buffer, sizeof(send_buffer));
Net_WriteLong(&send, -1); // -1 sequence means out of band
Mem_WriteBuffer(&send, data, len);
// send the datagram
Net_SendDatagram(sock, addr, send.data, send.size);
}
/*
* @brief Tries to send an unreliable message to a connection, and handles the
* transmission / retransmission of the reliable messages.
*
* A 0 size will still generate a packet and deal with the reliable messages.
*/
void Netchan_Transmit(net_chan_t *chan, byte *data, size_t len) {
mem_buf_t send;
byte send_buffer[MAX_MSG_SIZE];
// check for message overflow
if (chan->message.overflowed) {
chan->fatal_error = true;
Com_Print("%s:Outgoing message overflow\n", Net_NetaddrToString(&chan->remote_address));
return;
}
const _Bool send_reliable = Netchan_NeedReliable(chan);
if (!chan->reliable_size && chan->message.size) {
memcpy(chan->reliable_buffer, chan->message_buffer, chan->message.size);
chan->reliable_size = chan->message.size;
chan->message.size = 0;
chan->reliable_sequence ^= 1;
}
// write the packet header
Mem_InitBuffer(&send, send_buffer, sizeof(send_buffer));
const uint32_t w1 = (chan->outgoing_sequence & ~(1 << 31)) | (send_reliable << 31);
const uint32_t w2 = (chan->incoming_sequence & ~(1 << 31)) | (chan->incoming_reliable_sequence
<< 31);
chan->outgoing_sequence++;
chan->last_sent = quake2world.time;
Net_WriteLong(&send, w1);
Net_WriteLong(&send, w2);
// send the qport if we are a client
if (chan->source == NS_UDP_CLIENT)
Net_WriteByte(&send, chan->qport);
// copy the reliable message to the packet first
if (send_reliable) {
Mem_WriteBuffer(&send, chan->reliable_buffer, chan->reliable_size);
chan->last_reliable_sequence = chan->outgoing_sequence;
}
// add the unreliable part if space is available
if (send.max_size - send.size >= len)
Mem_WriteBuffer(&send, data, len);
else
Com_Warn("Netchan_Transmit: dumped unreliable\n");
// send the datagram
Net_SendDatagram(chan->source, &chan->remote_address, send.data, send.size);
if (net_showpackets->value) {
if (send_reliable)
Com_Print("Send %u bytes: s=%i reliable=%i ack=%i rack=%i\n", (uint32_t) send.size,
chan->outgoing_sequence - 1, chan->reliable_sequence, chan->incoming_sequence,
chan->incoming_reliable_sequence);
else
Com_Print("Send %u bytes : s=%i ack=%i rack=%i\n", (uint32_t) send.size,
chan->outgoing_sequence - 1, chan->incoming_sequence,
chan->incoming_reliable_sequence);
}
}