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New PROTOCOL_VERSION scheme (allow client to support a range of versions)

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This commit is contained in:
Perttu Ahola 2012-11-26 09:49:07 +02:00
parent ab507f83e2
commit 197542c7ec
3 changed files with 32 additions and 13 deletions
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9
src/client.cpp
View File

@ -499,8 +499,9 @@ void Client::step(float dtime)
// [2] u8 SER_FMT_VER_HIGHEST
// [3] u8[20] player_name
// [23] u8[28] password (new in some version)
// [51] u16 client network protocol version (new in some version)
SharedBuffer<u8> data(2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2);
// [51] u16 minimum supported network protocol version (added sometime)
// [53] u16 maximum supported network protocol version (added later than the previous one)
SharedBuffer<u8> data(2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2+2);
writeU16(&data[0], TOSERVER_INIT);
writeU8(&data[2], SER_FMT_VER_HIGHEST);
@ -513,8 +514,8 @@ void Client::step(float dtime)
memset((char*)&data[23], 0, PASSWORD_SIZE);
snprintf((char*)&data[23], PASSWORD_SIZE, "%s", m_password.c_str());
// This should be incremented in each version
writeU16(&data[51], PROTOCOL_VERSION);
writeU16(&data[51], CLIENT_PROTOCOL_VERSION_MIN);
writeU16(&data[53], CLIENT_PROTOCOL_VERSION_MAX);
// Send as unreliable
Send(0, data, false);

11
src/clientserver.h
View File

@ -75,8 +75,14 @@ with this program; if not, write to the Free Software Foundation, Inc.,
GENERIC_CMD_SET_ATTACHMENT
*/
#define PROTOCOL_VERSION 14
// Server always only supports one version
#define SERVER_PROTOCOL_VERSION 14
// Client can support older versions too
#define CLIENT_PROTOCOL_VERSION_MIN 13
#define CLIENT_PROTOCOL_VERSION_MAX SERVER_PROTOCOL_VERSION
// Constant that differentiates the protocol from random data and other protocols
#define PROTOCOL_ID 0x4f457403
#define PASSWORD_SIZE 28 // Maximum password length. Allows for
@ -350,7 +356,8 @@ enum ToServerCommand
[2] u8 SER_FMT_VER_HIGHEST
[3] u8[20] player_name
[23] u8[28] password (new in some version)
[51] u16 client network protocol version (new in some version)
[51] u16 minimum supported network protocol version (added sometime)
[53] u16 maximum supported network protocol version (added later than the previous one)
*/
TOSERVER_INIT2 = 0x11,

25
src/server.cpp
View File

@ -2037,11 +2037,22 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
Read and check network protocol version
*/
u16 net_proto_version = 0;
u16 min_net_proto_version = 0;
if(datasize >= 2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2)
{
net_proto_version = readU16(&data[2+1+PLAYERNAME_SIZE+PASSWORD_SIZE]);
}
min_net_proto_version = readU16(&data[2+1+PLAYERNAME_SIZE+PASSWORD_SIZE]);
// Use min if version field doesn't exist (backwards compatibility)
u16 max_net_proto_version = min_net_proto_version;
if(datasize >= 2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2+2)
max_net_proto_version = readU16(&data[2+1+PLAYERNAME_SIZE+PASSWORD_SIZE+2]);
u16 net_proto_version = max_net_proto_version;
if(max_net_proto_version != SERVER_PROTOCOL_VERSION && min_net_proto_version <= SERVER_PROTOCOL_VERSION)
net_proto_version = SERVER_PROTOCOL_VERSION;
verbosestream<<"Server: "<<peer_id<<" Protocol version: min: "
<<min_net_proto_version<<", max: "<<max_net_proto_version
<<", chosen: "<<net_proto_version<<std::endl;
getClient(peer_id)->net_proto_version = net_proto_version;
@ -2059,7 +2070,7 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
if(g_settings->getBool("strict_protocol_version_checking"))
{
if(net_proto_version != PROTOCOL_VERSION)
if(net_proto_version != SERVER_PROTOCOL_VERSION)
{
actionstream<<"Server: A mismatched client tried to connect"
<<" from "<<addr_s<<std::endl;
@ -2068,7 +2079,7 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
L"Server version is ")
+ narrow_to_wide(VERSION_STRING) + L",\n"
+ L"server's PROTOCOL_VERSION is "
+ narrow_to_wide(itos(PROTOCOL_VERSION))
+ narrow_to_wide(itos(SERVER_PROTOCOL_VERSION))
+ L", client's PROTOCOL_VERSION is "
+ narrow_to_wide(itos(net_proto_version))
);
@ -2310,7 +2321,7 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
}
// Warnings about protocol version can be issued here
if(getClient(peer_id)->net_proto_version < PROTOCOL_VERSION)
if(getClient(peer_id)->net_proto_version < SERVER_PROTOCOL_VERSION)
{
SendChatMessage(peer_id, L"# Server: WARNING: YOUR CLIENT IS OLD AND MAY WORK PROPERLY WITH THIS SERVER!");
}