Files
@ r9428:6800206a6c0d
Branch filter:
Location: cpp/openttd-patchpack/source/src/network/core/tcp.cpp
r9428:6800206a6c0d
5.9 KiB
text/x-c
(svn r13343) -Codechange: reorder/move variable/functions in the network headers so that nothing from the network directory needs to include basically all network headers.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 | /* $Id$ */
/**
* @file tcp.cpp Basic functions to receive and send TCP packets.
*/
#ifdef ENABLE_NETWORK
#include "../../stdafx.h"
#include "../../debug.h"
#include "../../openttd.h"
#include "../../variables.h"
#include "../network_internal.h"
#include "packet.h"
#include "tcp.h"
#include "table/strings.h"
/** Very ugly temporary hack !!! */
void NetworkTCPSocketHandler::Initialize()
{
this->sock = INVALID_SOCKET;
this->index = 0;
this->last_frame = 0;
this->last_frame_server = 0;
this->lag_test = 0;
this->status = STATUS_INACTIVE;
this->has_quit = false;
this->writable = false;
this->packet_queue = NULL;
this->packet_recv = NULL;
this->command_queue = NULL;
}
void NetworkTCPSocketHandler::Destroy()
{
closesocket(this->sock);
this->writable = false;
this->has_quit = true;
/* Free all pending and partially received packets */
while (this->packet_queue != NULL) {
Packet *p = this->packet_queue->next;
delete this->packet_queue;
this->packet_queue = p;
}
delete this->packet_recv;
this->packet_recv = NULL;
while (this->command_queue != NULL) {
CommandPacket *p = this->command_queue->next;
free(this->command_queue);
this->command_queue = p;
}
}
/**
* Functions to help NetworkRecv_Packet/NetworkSend_Packet a bit
* A socket can make errors. When that happens this handles what to do.
* For clients: close connection and drop back to main-menu
* For servers: close connection and that is it
* @return the new status
* TODO: needs to be splitted when using client and server socket packets
*/
NetworkRecvStatus NetworkTCPSocketHandler::CloseConnection()
{
NetworkCloseClient(this);
/* Clients drop back to the main menu */
if (!_network_server && _networking) {
_switch_mode = SM_MENU;
_networking = false;
extern StringID _switch_mode_errorstr;
_switch_mode_errorstr = STR_NETWORK_ERR_LOSTCONNECTION;
return NETWORK_RECV_STATUS_CONN_LOST;
}
return NETWORK_RECV_STATUS_OKAY;
}
/**
* This function puts the packet in the send-queue and it is send as
* soon as possible. This is the next tick, or maybe one tick later
* if the OS-network-buffer is full)
* @param packet the packet to send
*/
void NetworkTCPSocketHandler::Send_Packet(Packet *packet)
{
Packet *p;
assert(packet != NULL);
packet->PrepareToSend();
/* Locate last packet buffered for the client */
p = this->packet_queue;
if (p == NULL) {
/* No packets yet */
this->packet_queue = packet;
} else {
/* Skip to the last packet */
while (p->next != NULL) p = p->next;
p->next = packet;
}
}
/**
* Sends all the buffered packets out for this client. It stops when:
* 1) all packets are send (queue is empty)
* 2) the OS reports back that it can not send any more
* data right now (full network-buffer, it happens ;))
* 3) sending took too long
*/
bool NetworkTCPSocketHandler::Send_Packets()
{
ssize_t res;
Packet *p;
/* We can not write to this socket!! */
if (!this->writable) return false;
if (!this->IsConnected()) return false;
p = this->packet_queue;
while (p != NULL) {
res = send(this->sock, (const char*)p->buffer + p->pos, p->size - p->pos, 0);
if (res == -1) {
int err = GET_LAST_ERROR();
if (err != EWOULDBLOCK) {
/* Something went wrong.. close client! */
DEBUG(net, 0, "send failed with error %d", err);
this->CloseConnection();
return false;
}
return true;
}
if (res == 0) {
/* Client/server has left us :( */
this->CloseConnection();
return false;
}
p->pos += res;
/* Is this packet sent? */
if (p->pos == p->size) {
/* Go to the next packet */
this->packet_queue = p->next;
delete p;
p = this->packet_queue;
} else {
return true;
}
}
return true;
}
/**
* Receives a packet for the given client
* @param status the variable to store the status into
* @return the received packet (or NULL when it didn't receive one)
*/
Packet *NetworkTCPSocketHandler::Recv_Packet(NetworkRecvStatus *status)
{
ssize_t res;
Packet *p;
*status = NETWORK_RECV_STATUS_OKAY;
if (!this->IsConnected()) return NULL;
if (this->packet_recv == NULL) {
this->packet_recv = new Packet(this);
if (this->packet_recv == NULL) error("Failed to allocate packet");
}
p = this->packet_recv;
/* Read packet size */
if (p->pos < sizeof(PacketSize)) {
while (p->pos < sizeof(PacketSize)) {
/* Read the size of the packet */
res = recv(this->sock, (char*)p->buffer + p->pos, sizeof(PacketSize) - p->pos, 0);
if (res == -1) {
int err = GET_LAST_ERROR();
if (err != EWOULDBLOCK) {
/* Something went wrong... (104 is connection reset by peer) */
if (err != 104) DEBUG(net, 0, "recv failed with error %d", err);
*status = this->CloseConnection();
return NULL;
}
/* Connection would block, so stop for now */
return NULL;
}
if (res == 0) {
/* Client/server has left */
*status = this->CloseConnection();
return NULL;
}
p->pos += res;
}
/* Read the packet size from the received packet */
p->ReadRawPacketSize();
if (p->size > SEND_MTU) {
*status = this->CloseConnection();
return NULL;
}
}
/* Read rest of packet */
while (p->pos < p->size) {
res = recv(this->sock, (char*)p->buffer + p->pos, p->size - p->pos, 0);
if (res == -1) {
int err = GET_LAST_ERROR();
if (err != EWOULDBLOCK) {
/* Something went wrong... (104 is connection reset by peer) */
if (err != 104) DEBUG(net, 0, "recv failed with error %d", err);
*status = this->CloseConnection();
return NULL;
}
/* Connection would block */
return NULL;
}
if (res == 0) {
/* Client/server has left */
*status = this->CloseConnection();
return NULL;
}
p->pos += res;
}
/* Prepare for receiving a new packet */
this->packet_recv = NULL;
p->PrepareToRead();
return p;
}
bool NetworkTCPSocketHandler::IsPacketQueueEmpty()
{
return this->packet_queue == NULL;
}
#endif /* ENABLE_NETWORK */
|