The Quake III Arena sources as originally released under the GPL license on August 20, 2005.
This commit is contained in:
Travis Bradshaw
commit
dbe4ddb103
1409 changed files with 806066 additions and 0 deletions
742
code/qcommon/net_chan.c
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742
code/qcommon/net_chan.c
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@ -0,0 +1,742 @@
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/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "../game/q_shared.h"
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#include "qcommon.h"
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/*
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packet header
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-------------
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4 outgoing sequence. high bit will be set if this is a fragmented message
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[2 qport (only for client to server)]
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[2 fragment start byte]
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[2 fragment length. if < FRAGMENT_SIZE, this is the last fragment]
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if the sequence number is -1, the packet should be handled as an out-of-band
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message instead of as part of a netcon.
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All fragments will have the same sequence numbers.
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The qport field is a workaround for bad address translating routers that
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sometimes remap the client's source port on a packet during gameplay.
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If the base part of the net address matches and the qport matches, then the
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channel matches even if the IP port differs. The IP port should be updated
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to the new value before sending out any replies.
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*/
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#define MAX_PACKETLEN 1400 // max size of a network packet
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#define FRAGMENT_SIZE (MAX_PACKETLEN - 100)
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#define PACKET_HEADER 10 // two ints and a short
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#define FRAGMENT_BIT (1<<31)
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cvar_t *showpackets;
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cvar_t *showdrop;
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cvar_t *qport;
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static char *netsrcString[2] = {
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"client",
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"server"
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};
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/*
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===============
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Netchan_Init
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===============
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*/
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void Netchan_Init( int port ) {
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port &= 0xffff;
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showpackets = Cvar_Get ("showpackets", "0", CVAR_TEMP );
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showdrop = Cvar_Get ("showdrop", "0", CVAR_TEMP );
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qport = Cvar_Get ("net_qport", va("%i", port), CVAR_INIT );
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}
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/*
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==============
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Netchan_Setup
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called to open a channel to a remote system
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==============
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*/
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void Netchan_Setup( netsrc_t sock, netchan_t *chan, netadr_t adr, int qport ) {
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Com_Memset (chan, 0, sizeof(*chan));
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chan->sock = sock;
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chan->remoteAddress = adr;
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chan->qport = qport;
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chan->incomingSequence = 0;
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chan->outgoingSequence = 1;
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}
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// TTimo: unused, commenting out to make gcc happy
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#if 0
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/*
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==============
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Netchan_ScramblePacket
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A probably futile attempt to make proxy hacking somewhat
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more difficult.
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==============
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*/
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#define SCRAMBLE_START 6
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static void Netchan_ScramblePacket( msg_t *buf ) {
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unsigned seed;
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int i, j, c, mask, temp;
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int seq[MAX_PACKETLEN];
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seed = ( LittleLong( *(unsigned *)buf->data ) * 3 ) ^ ( buf->cursize * 123 );
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c = buf->cursize;
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if ( c <= SCRAMBLE_START ) {
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return;
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}
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if ( c > MAX_PACKETLEN ) {
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Com_Error( ERR_DROP, "MAX_PACKETLEN" );
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}
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// generate a sequence of "random" numbers
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for (i = 0 ; i < c ; i++) {
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seed = (119 * seed + 1);
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seq[i] = seed;
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}
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// transpose each character
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for ( mask = 1 ; mask < c-SCRAMBLE_START ; mask = ( mask << 1 ) + 1 ) {
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}
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mask >>= 1;
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for (i = SCRAMBLE_START ; i < c ; i++) {
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j = SCRAMBLE_START + ( seq[i] & mask );
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temp = buf->data[j];
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buf->data[j] = buf->data[i];
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buf->data[i] = temp;
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}
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// byte xor the data after the header
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for (i = SCRAMBLE_START ; i < c ; i++) {
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buf->data[i] ^= seq[i];
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}
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}
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static void Netchan_UnScramblePacket( msg_t *buf ) {
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unsigned seed;
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int i, j, c, mask, temp;
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int seq[MAX_PACKETLEN];
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seed = ( LittleLong( *(unsigned *)buf->data ) * 3 ) ^ ( buf->cursize * 123 );
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c = buf->cursize;
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if ( c <= SCRAMBLE_START ) {
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return;
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}
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if ( c > MAX_PACKETLEN ) {
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Com_Error( ERR_DROP, "MAX_PACKETLEN" );
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}
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// generate a sequence of "random" numbers
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for (i = 0 ; i < c ; i++) {
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seed = (119 * seed + 1);
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seq[i] = seed;
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}
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// byte xor the data after the header
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for (i = SCRAMBLE_START ; i < c ; i++) {
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buf->data[i] ^= seq[i];
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}
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// transpose each character in reverse order
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for ( mask = 1 ; mask < c-SCRAMBLE_START ; mask = ( mask << 1 ) + 1 ) {
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}
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mask >>= 1;
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for (i = c-1 ; i >= SCRAMBLE_START ; i--) {
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j = SCRAMBLE_START + ( seq[i] & mask );
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temp = buf->data[j];
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buf->data[j] = buf->data[i];
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buf->data[i] = temp;
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}
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}
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#endif
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/*
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=================
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Netchan_TransmitNextFragment
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Send one fragment of the current message
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=================
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*/
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void Netchan_TransmitNextFragment( netchan_t *chan ) {
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msg_t send;
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byte send_buf[MAX_PACKETLEN];
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int fragmentLength;
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// write the packet header
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MSG_InitOOB (&send, send_buf, sizeof(send_buf)); // <-- only do the oob here
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MSG_WriteLong( &send, chan->outgoingSequence | FRAGMENT_BIT );
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// send the qport if we are a client
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if ( chan->sock == NS_CLIENT ) {
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MSG_WriteShort( &send, qport->integer );
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}
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// copy the reliable message to the packet first
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fragmentLength = FRAGMENT_SIZE;
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if ( chan->unsentFragmentStart + fragmentLength > chan->unsentLength ) {
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fragmentLength = chan->unsentLength - chan->unsentFragmentStart;
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}
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MSG_WriteShort( &send, chan->unsentFragmentStart );
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MSG_WriteShort( &send, fragmentLength );
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MSG_WriteData( &send, chan->unsentBuffer + chan->unsentFragmentStart, fragmentLength );
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// send the datagram
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NET_SendPacket( chan->sock, send.cursize, send.data, chan->remoteAddress );
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if ( showpackets->integer ) {
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Com_Printf ("%s send %4i : s=%i fragment=%i,%i\n"
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, netsrcString[ chan->sock ]
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, send.cursize
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, chan->outgoingSequence
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, chan->unsentFragmentStart, fragmentLength);
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}
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chan->unsentFragmentStart += fragmentLength;
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// this exit condition is a little tricky, because a packet
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// that is exactly the fragment length still needs to send
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// a second packet of zero length so that the other side
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// can tell there aren't more to follow
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if ( chan->unsentFragmentStart == chan->unsentLength && fragmentLength != FRAGMENT_SIZE ) {
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chan->outgoingSequence++;
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chan->unsentFragments = qfalse;
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}
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}
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/*
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===============
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Netchan_Transmit
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Sends a message to a connection, fragmenting if necessary
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A 0 length will still generate a packet.
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================
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*/
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void Netchan_Transmit( netchan_t *chan, int length, const byte *data ) {
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msg_t send;
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byte send_buf[MAX_PACKETLEN];
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if ( length > MAX_MSGLEN ) {
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Com_Error( ERR_DROP, "Netchan_Transmit: length = %i", length );
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}
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chan->unsentFragmentStart = 0;
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// fragment large reliable messages
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if ( length >= FRAGMENT_SIZE ) {
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chan->unsentFragments = qtrue;
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chan->unsentLength = length;
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Com_Memcpy( chan->unsentBuffer, data, length );
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// only send the first fragment now
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Netchan_TransmitNextFragment( chan );
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return;
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}
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// write the packet header
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MSG_InitOOB (&send, send_buf, sizeof(send_buf));
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MSG_WriteLong( &send, chan->outgoingSequence );
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chan->outgoingSequence++;
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// send the qport if we are a client
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if ( chan->sock == NS_CLIENT ) {
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MSG_WriteShort( &send, qport->integer );
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}
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MSG_WriteData( &send, data, length );
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// send the datagram
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NET_SendPacket( chan->sock, send.cursize, send.data, chan->remoteAddress );
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if ( showpackets->integer ) {
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Com_Printf( "%s send %4i : s=%i ack=%i\n"
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, netsrcString[ chan->sock ]
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, send.cursize
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, chan->outgoingSequence - 1
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, chan->incomingSequence );
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}
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}
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/*
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=================
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Netchan_Process
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Returns qfalse if the message should not be processed due to being
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out of order or a fragment.
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Msg must be large enough to hold MAX_MSGLEN, because if this is the
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final fragment of a multi-part message, the entire thing will be
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copied out.
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=================
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*/
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qboolean Netchan_Process( netchan_t *chan, msg_t *msg ) {
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int sequence;
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int qport;
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int fragmentStart, fragmentLength;
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qboolean fragmented;
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// XOR unscramble all data in the packet after the header
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// Netchan_UnScramblePacket( msg );
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// get sequence numbers
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MSG_BeginReadingOOB( msg );
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sequence = MSG_ReadLong( msg );
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// check for fragment information
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if ( sequence & FRAGMENT_BIT ) {
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sequence &= ~FRAGMENT_BIT;
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fragmented = qtrue;
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} else {
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fragmented = qfalse;
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}
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// read the qport if we are a server
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if ( chan->sock == NS_SERVER ) {
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qport = MSG_ReadShort( msg );
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}
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// read the fragment information
|
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if ( fragmented ) {
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fragmentStart = MSG_ReadShort( msg );
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fragmentLength = MSG_ReadShort( msg );
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} else {
|
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fragmentStart = 0; // stop warning message
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fragmentLength = 0;
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}
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|
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if ( showpackets->integer ) {
|
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if ( fragmented ) {
|
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Com_Printf( "%s recv %4i : s=%i fragment=%i,%i\n"
|
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, netsrcString[ chan->sock ]
|
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, msg->cursize
|
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, sequence
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, fragmentStart, fragmentLength );
|
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} else {
|
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Com_Printf( "%s recv %4i : s=%i\n"
|
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, netsrcString[ chan->sock ]
|
||||
, msg->cursize
|
||||
, sequence );
|
||||
}
|
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}
|
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|
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//
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// discard out of order or duplicated packets
|
||||
//
|
||||
if ( sequence <= chan->incomingSequence ) {
|
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if ( showdrop->integer || showpackets->integer ) {
|
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Com_Printf( "%s:Out of order packet %i at %i\n"
|
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, NET_AdrToString( chan->remoteAddress )
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, sequence
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, chan->incomingSequence );
|
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}
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return qfalse;
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}
|
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|
||||
//
|
||||
// dropped packets don't keep the message from being used
|
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//
|
||||
chan->dropped = sequence - (chan->incomingSequence+1);
|
||||
if ( chan->dropped > 0 ) {
|
||||
if ( showdrop->integer || showpackets->integer ) {
|
||||
Com_Printf( "%s:Dropped %i packets at %i\n"
|
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, NET_AdrToString( chan->remoteAddress )
|
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, chan->dropped
|
||||
, sequence );
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// if this is the final framgent of a reliable message,
|
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// bump incoming_reliable_sequence
|
||||
//
|
||||
if ( fragmented ) {
|
||||
// TTimo
|
||||
// make sure we add the fragments in correct order
|
||||
// either a packet was dropped, or we received this one too soon
|
||||
// we don't reconstruct the fragments. we will wait till this fragment gets to us again
|
||||
// (NOTE: we could probably try to rebuild by out of order chunks if needed)
|
||||
if ( sequence != chan->fragmentSequence ) {
|
||||
chan->fragmentSequence = sequence;
|
||||
chan->fragmentLength = 0;
|
||||
}
|
||||
|
||||
// if we missed a fragment, dump the message
|
||||
if ( fragmentStart != chan->fragmentLength ) {
|
||||
if ( showdrop->integer || showpackets->integer ) {
|
||||
Com_Printf( "%s:Dropped a message fragment\n"
|
||||
, NET_AdrToString( chan->remoteAddress )
|
||||
, sequence);
|
||||
}
|
||||
// we can still keep the part that we have so far,
|
||||
// so we don't need to clear chan->fragmentLength
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
// copy the fragment to the fragment buffer
|
||||
if ( fragmentLength < 0 || msg->readcount + fragmentLength > msg->cursize ||
|
||||
chan->fragmentLength + fragmentLength > sizeof( chan->fragmentBuffer ) ) {
|
||||
if ( showdrop->integer || showpackets->integer ) {
|
||||
Com_Printf ("%s:illegal fragment length\n"
|
||||
, NET_AdrToString (chan->remoteAddress ) );
|
||||
}
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
Com_Memcpy( chan->fragmentBuffer + chan->fragmentLength,
|
||||
msg->data + msg->readcount, fragmentLength );
|
||||
|
||||
chan->fragmentLength += fragmentLength;
|
||||
|
||||
// if this wasn't the last fragment, don't process anything
|
||||
if ( fragmentLength == FRAGMENT_SIZE ) {
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
if ( chan->fragmentLength > msg->maxsize ) {
|
||||
Com_Printf( "%s:fragmentLength %i > msg->maxsize\n"
|
||||
, NET_AdrToString (chan->remoteAddress ),
|
||||
chan->fragmentLength );
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
// copy the full message over the partial fragment
|
||||
|
||||
// make sure the sequence number is still there
|
||||
*(int *)msg->data = LittleLong( sequence );
|
||||
|
||||
Com_Memcpy( msg->data + 4, chan->fragmentBuffer, chan->fragmentLength );
|
||||
msg->cursize = chan->fragmentLength + 4;
|
||||
chan->fragmentLength = 0;
|
||||
msg->readcount = 4; // past the sequence number
|
||||
msg->bit = 32; // past the sequence number
|
||||
|
||||
// TTimo
|
||||
// clients were not acking fragmented messages
|
||||
chan->incomingSequence = sequence;
|
||||
|
||||
return qtrue;
|
||||
}
|
||||
|
||||
//
|
||||
// the message can now be read from the current message pointer
|
||||
//
|
||||
chan->incomingSequence = sequence;
|
||||
|
||||
return qtrue;
|
||||
}
|
||||
|
||||
|
||||
//==============================================================================
|
||||
|
||||
/*
|
||||
===================
|
||||
NET_CompareBaseAdr
|
||||
|
||||
Compares without the port
|
||||
===================
|
||||
*/
|
||||
qboolean NET_CompareBaseAdr (netadr_t a, netadr_t b)
|
||||
{
|
||||
if (a.type != b.type)
|
||||
return qfalse;
|
||||
|
||||
if (a.type == NA_LOOPBACK)
|
||||
return qtrue;
|
||||
|
||||
if (a.type == NA_IP)
|
||||
{
|
||||
if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3])
|
||||
return qtrue;
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
if (a.type == NA_IPX)
|
||||
{
|
||||
if ((memcmp(a.ipx, b.ipx, 10) == 0))
|
||||
return qtrue;
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
|
||||
Com_Printf ("NET_CompareBaseAdr: bad address type\n");
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
const char *NET_AdrToString (netadr_t a)
|
||||
{
|
||||
static char s[64];
|
||||
|
||||
if (a.type == NA_LOOPBACK) {
|
||||
Com_sprintf (s, sizeof(s), "loopback");
|
||||
} else if (a.type == NA_BOT) {
|
||||
Com_sprintf (s, sizeof(s), "bot");
|
||||
} else if (a.type == NA_IP) {
|
||||
Com_sprintf (s, sizeof(s), "%i.%i.%i.%i:%hu",
|
||||
a.ip[0], a.ip[1], a.ip[2], a.ip[3], BigShort(a.port));
|
||||
} else {
|
||||
Com_sprintf (s, sizeof(s), "%02x%02x%02x%02x.%02x%02x%02x%02x%02x%02x:%hu",
|
||||
a.ipx[0], a.ipx[1], a.ipx[2], a.ipx[3], a.ipx[4], a.ipx[5], a.ipx[6], a.ipx[7], a.ipx[8], a.ipx[9],
|
||||
BigShort(a.port));
|
||||
}
|
||||
|
||||
return s;
|
||||
}
|
||||
|
||||
|
||||
qboolean NET_CompareAdr (netadr_t a, netadr_t b)
|
||||
{
|
||||
if (a.type != b.type)
|
||||
return qfalse;
|
||||
|
||||
if (a.type == NA_LOOPBACK)
|
||||
return qtrue;
|
||||
|
||||
if (a.type == NA_IP)
|
||||
{
|
||||
if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3] && a.port == b.port)
|
||||
return qtrue;
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
if (a.type == NA_IPX)
|
||||
{
|
||||
if ((memcmp(a.ipx, b.ipx, 10) == 0) && a.port == b.port)
|
||||
return qtrue;
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
Com_Printf ("NET_CompareAdr: bad address type\n");
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
|
||||
qboolean NET_IsLocalAddress( netadr_t adr ) {
|
||||
return adr.type == NA_LOOPBACK;
|
||||
}
|
||||
|
||||
|
||||
|
||||
/*
|
||||
=============================================================================
|
||||
|
||||
LOOPBACK BUFFERS FOR LOCAL PLAYER
|
||||
|
||||
=============================================================================
|
||||
*/
|
||||
|
||||
// there needs to be enough loopback messages to hold a complete
|
||||
// gamestate of maximum size
|
||||
#define MAX_LOOPBACK 16
|
||||
|
||||
typedef struct {
|
||||
byte data[MAX_PACKETLEN];
|
||||
int datalen;
|
||||
} loopmsg_t;
|
||||
|
||||
typedef struct {
|
||||
loopmsg_t msgs[MAX_LOOPBACK];
|
||||
int get, send;
|
||||
} loopback_t;
|
||||
|
||||
loopback_t loopbacks[2];
|
||||
|
||||
|
||||
qboolean NET_GetLoopPacket (netsrc_t sock, netadr_t *net_from, msg_t *net_message)
|
||||
{
|
||||
int i;
|
||||
loopback_t *loop;
|
||||
|
||||
loop = &loopbacks[sock];
|
||||
|
||||
if (loop->send - loop->get > MAX_LOOPBACK)
|
||||
loop->get = loop->send - MAX_LOOPBACK;
|
||||
|
||||
if (loop->get >= loop->send)
|
||||
return qfalse;
|
||||
|
||||
i = loop->get & (MAX_LOOPBACK-1);
|
||||
loop->get++;
|
||||
|
||||
Com_Memcpy (net_message->data, loop->msgs[i].data, loop->msgs[i].datalen);
|
||||
net_message->cursize = loop->msgs[i].datalen;
|
||||
Com_Memset (net_from, 0, sizeof(*net_from));
|
||||
net_from->type = NA_LOOPBACK;
|
||||
return qtrue;
|
||||
|
||||
}
|
||||
|
||||
|
||||
void NET_SendLoopPacket (netsrc_t sock, int length, const void *data, netadr_t to)
|
||||
{
|
||||
int i;
|
||||
loopback_t *loop;
|
||||
|
||||
loop = &loopbacks[sock^1];
|
||||
|
||||
i = loop->send & (MAX_LOOPBACK-1);
|
||||
loop->send++;
|
||||
|
||||
Com_Memcpy (loop->msgs[i].data, data, length);
|
||||
loop->msgs[i].datalen = length;
|
||||
}
|
||||
|
||||
//=============================================================================
|
||||
|
||||
|
||||
void NET_SendPacket( netsrc_t sock, int length, const void *data, netadr_t to ) {
|
||||
|
||||
// sequenced packets are shown in netchan, so just show oob
|
||||
if ( showpackets->integer && *(int *)data == -1 ) {
|
||||
Com_Printf ("send packet %4i\n", length);
|
||||
}
|
||||
|
||||
if ( to.type == NA_LOOPBACK ) {
|
||||
NET_SendLoopPacket (sock, length, data, to);
|
||||
return;
|
||||
}
|
||||
if ( to.type == NA_BOT ) {
|
||||
return;
|
||||
}
|
||||
if ( to.type == NA_BAD ) {
|
||||
return;
|
||||
}
|
||||
|
||||
Sys_SendPacket( length, data, to );
|
||||
}
|
||||
|
||||
/*
|
||||
===============
|
||||
NET_OutOfBandPrint
|
||||
|
||||
Sends a text message in an out-of-band datagram
|
||||
================
|
||||
*/
|
||||
void QDECL NET_OutOfBandPrint( netsrc_t sock, netadr_t adr, const char *format, ... ) {
|
||||
va_list argptr;
|
||||
char string[MAX_MSGLEN];
|
||||
|
||||
|
||||
// set the header
|
||||
string[0] = -1;
|
||||
string[1] = -1;
|
||||
string[2] = -1;
|
||||
string[3] = -1;
|
||||
|
||||
va_start( argptr, format );
|
||||
vsprintf( string+4, format, argptr );
|
||||
va_end( argptr );
|
||||
|
||||
// send the datagram
|
||||
NET_SendPacket( sock, strlen( string ), string, adr );
|
||||
}
|
||||
|
||||
/*
|
||||
===============
|
||||
NET_OutOfBandPrint
|
||||
|
||||
Sends a data message in an out-of-band datagram (only used for "connect")
|
||||
================
|
||||
*/
|
||||
void QDECL NET_OutOfBandData( netsrc_t sock, netadr_t adr, byte *format, int len ) {
|
||||
byte string[MAX_MSGLEN*2];
|
||||
int i;
|
||||
msg_t mbuf;
|
||||
|
||||
// set the header
|
||||
string[0] = 0xff;
|
||||
string[1] = 0xff;
|
||||
string[2] = 0xff;
|
||||
string[3] = 0xff;
|
||||
|
||||
for(i=0;i<len;i++) {
|
||||
string[i+4] = format[i];
|
||||
}
|
||||
|
||||
mbuf.data = string;
|
||||
mbuf.cursize = len+4;
|
||||
Huff_Compress( &mbuf, 12);
|
||||
// send the datagram
|
||||
NET_SendPacket( sock, mbuf.cursize, mbuf.data, adr );
|
||||
}
|
||||
|
||||
/*
|
||||
=============
|
||||
NET_StringToAdr
|
||||
|
||||
Traps "localhost" for loopback, passes everything else to system
|
||||
=============
|
||||
*/
|
||||
qboolean NET_StringToAdr( const char *s, netadr_t *a ) {
|
||||
qboolean r;
|
||||
char base[MAX_STRING_CHARS];
|
||||
char *port;
|
||||
|
||||
if (!strcmp (s, "localhost")) {
|
||||
Com_Memset (a, 0, sizeof(*a));
|
||||
a->type = NA_LOOPBACK;
|
||||
return qtrue;
|
||||
}
|
||||
|
||||
// look for a port number
|
||||
Q_strncpyz( base, s, sizeof( base ) );
|
||||
port = strstr( base, ":" );
|
||||
if ( port ) {
|
||||
*port = 0;
|
||||
port++;
|
||||
}
|
||||
|
||||
r = Sys_StringToAdr( base, a );
|
||||
|
||||
if ( !r ) {
|
||||
a->type = NA_BAD;
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
// inet_addr returns this if out of range
|
||||
if ( a->ip[0] == 255 && a->ip[1] == 255 && a->ip[2] == 255 && a->ip[3] == 255 ) {
|
||||
a->type = NA_BAD;
|
||||
return qfalse;
|
||||
}
|
||||
|
||||
if ( port ) {
|
||||
a->port = BigShort( (short)atoi( port ) );
|
||||
} else {
|
||||
a->port = BigShort( PORT_SERVER );
|
||||
}
|
||||
|
||||
return qtrue;
|
||||
}
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue