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1.1 |
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/* |
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* static char *rcsid_sockets_c = |
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root |
1.2 |
* "$Id$"; |
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1.1 |
*/ |
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/* |
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CrossFire, A Multiplayer game for X-windows |
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Copyright (C) 1992 Frank Tore Johansen |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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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 this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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The author can be reached via e-mail to mark@pyramid.com |
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*/ |
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/** |
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* \file |
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* Low-level socket-related functions. |
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* |
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* \date 2003-12-02 |
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* |
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* Contains some base functions that both the client and server |
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* can use. As such, depending what we are being compiled for will |
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* determine what we can include. the client is designed have |
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* CFCLIENT defined as part of its compile flags. |
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*/ |
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#include <global.h> |
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#include <newclient.h> |
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#include <sproto.h> |
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root |
1.2 |
#ifdef __linux__ |
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# include <sys/types.h> |
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# include <sys/socket.h> |
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# include <netinet/in.h> |
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# include <netinet/tcp.h> |
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#endif |
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void Socket_Flush (NewSocket *ns) |
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{ |
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#ifdef __linux__ |
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int val; |
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val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
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val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
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#endif |
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} |
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root |
1.1 |
/*********************************************************************** |
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* |
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* SockList functions/utilities |
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* |
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**********************************************************************/ |
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void SockList_Init(SockList *sl) |
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{ |
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sl->len=0; |
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sl->buf=NULL; |
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} |
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void SockList_AddChar(SockList *sl, char c) |
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{ |
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sl->buf[sl->len]=c; |
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sl->len++; |
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} |
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void SockList_AddShort(SockList *sl, uint16 data) |
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{ |
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sl->buf[sl->len++]= (data>>8)&0xff; |
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sl->buf[sl->len++] = data & 0xff; |
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} |
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void SockList_AddInt(SockList *sl, uint32 data) |
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{ |
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sl->buf[sl->len++]= (data>>24)&0xff; |
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sl->buf[sl->len++]= (data>>16)&0xff; |
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sl->buf[sl->len++]= (data>>8)&0xff; |
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sl->buf[sl->len++] = data & 0xff; |
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} |
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void SockList_AddInt64(SockList *sl, uint64 data) |
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{ |
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sl->buf[sl->len++]= ( char )( (data>>56)&0xff ); |
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sl->buf[sl->len++]= ( char )( (data>>48)&0xff ); |
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sl->buf[sl->len++]= ( char )( (data>>40)&0xff ); |
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sl->buf[sl->len++]= ( char )( (data>>32)&0xff ); |
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sl->buf[sl->len++]= ( char )( (data>>24)&0xff ); |
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sl->buf[sl->len++]= ( char )( (data>>16)&0xff ); |
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sl->buf[sl->len++]= ( char )( (data>>8)&0xff ); |
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sl->buf[sl->len++] =( char )( data & 0xff ); |
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} |
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/* Basically does the reverse of SockList_AddInt, but on |
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* strings instead. Same for the GetShort, but for 16 bits. |
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*/ |
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int GetInt_String(unsigned char *data) |
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{ |
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return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]); |
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} |
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short GetShort_String(unsigned char *data) { |
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return ((data[0]<<8)+data[1]); |
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} |
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/****************************************************************************** |
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* |
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* Start of read routines. |
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* |
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******************************************************************************/ |
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/** |
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* This reads from fd and puts the data in sl. We return true if we think |
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* we have a full packet, 0 if we have a partial packet. The only processing |
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* we do is remove the intial size value. len (As passed) is the size of the |
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* buffer allocated in the socklist. We make the assumption the buffer is |
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* at least 2 bytes long. |
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*/ |
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int SockList_ReadPacket(int fd, SockList *sl, int len) |
134 |
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{ |
135 |
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int stat,toread; |
136 |
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extern int errno; |
137 |
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138 |
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/* Sanity check - shouldn't happen */ |
139 |
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if (sl->len < 0) { |
140 |
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abort(); |
141 |
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} |
142 |
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/* We already have a partial packet */ |
143 |
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if (sl->len<2) { |
144 |
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#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */ |
145 |
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146 |
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stat=recv(fd, sl->buf + sl->len, 2-sl->len,0); |
147 |
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148 |
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#else |
149 |
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do { |
150 |
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stat=read(fd, sl->buf + sl->len, 2-sl->len); |
151 |
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} while ((stat==-1) && (errno==EINTR)); |
152 |
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#endif |
153 |
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if (stat<0) { |
154 |
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/* In non blocking mode, EAGAIN is set when there is no |
155 |
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* data available. |
156 |
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*/ |
157 |
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#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ |
158 |
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if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) { |
159 |
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if(WSAGetLastError() == WSAECONNRESET) |
160 |
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LOG(llevDebug,"Connection closed by client\n"); |
161 |
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else |
162 |
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{ |
163 |
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LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError()); |
164 |
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} |
165 |
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return -1; /* kick this user! */ |
166 |
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} |
167 |
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#else |
168 |
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if (errno != EAGAIN && errno !=EWOULDBLOCK) { |
169 |
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LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); |
170 |
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} |
171 |
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#endif |
172 |
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return 0; /*Error */ |
173 |
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} |
174 |
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if (stat==0) return -1; |
175 |
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sl->len += stat; |
176 |
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#ifdef CS_LOGSTATS |
177 |
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cst_tot.ibytes += stat; |
178 |
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cst_lst.ibytes += stat; |
179 |
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#endif |
180 |
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if (stat<2) return 0; /* Still don't have a full packet */ |
181 |
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} |
182 |
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/* Figure out how much more data we need to read. Add 2 from the |
183 |
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* end of this - size header information is not included. |
184 |
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*/ |
185 |
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toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len; |
186 |
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if ((toread + sl->len) >= len) { |
187 |
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LOG(llevError,"SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", |
188 |
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toread + sl->len, len); |
189 |
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/* Quick hack in case for 'oldsocketmode' input. If we are |
190 |
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* closing the socket anyways, then reading this extra 100 bytes |
191 |
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* shouldn't hurt. |
192 |
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*/ |
193 |
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#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */ |
194 |
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recv(fd, sl->buf+2, 100, 0); |
195 |
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#else |
196 |
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read(fd, sl->buf+2, 100); |
197 |
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#endif /* end win32 */ |
198 |
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199 |
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/* return error so the socket is closed */ |
200 |
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return -1; |
201 |
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} |
202 |
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do { |
203 |
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#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */ |
204 |
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stat = recv(fd, sl->buf+ sl->len, toread, 0); |
205 |
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#else |
206 |
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do { |
207 |
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stat = read(fd, sl->buf+ sl->len, toread); |
208 |
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} while ((stat<0) && (errno==EINTR)); |
209 |
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#endif |
210 |
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if (stat<0) { |
211 |
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212 |
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#ifdef WIN32 /* ***win32 SockList_ReadPacket: change error handling for win32 */ |
213 |
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if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) { |
214 |
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if(WSAGetLastError() == WSAECONNRESET) |
215 |
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LOG(llevDebug,"Connection closed by client\n"); |
216 |
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else |
217 |
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{ |
218 |
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LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError()); |
219 |
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} |
220 |
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return -1; /* kick this user! */ |
221 |
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} |
222 |
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#else |
223 |
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if (errno != EAGAIN && errno !=EWOULDBLOCK) { |
224 |
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LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); |
225 |
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} |
226 |
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#endif |
227 |
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return 0; /*Error */ |
228 |
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} |
229 |
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if (stat==0) return -1; |
230 |
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sl->len += stat; |
231 |
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#ifdef CS_LOGSTATS |
232 |
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cst_tot.ibytes += stat; |
233 |
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cst_lst.ibytes += stat; |
234 |
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#endif |
235 |
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toread -= stat; |
236 |
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if (toread==0) return 1; |
237 |
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if (toread < 0) { |
238 |
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LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n"); |
239 |
|
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return 1; |
240 |
|
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} |
241 |
|
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} while (toread>0); |
242 |
|
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return 0; |
243 |
|
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} |
244 |
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245 |
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/******************************************************************************* |
246 |
|
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* |
247 |
|
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* Start of write related routines. |
248 |
|
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* |
249 |
|
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******************************************************************************/ |
250 |
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|
251 |
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/** |
252 |
|
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* Adds data to a socket buffer for whatever reason. |
253 |
|
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* |
254 |
|
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* ns is the socket we are adding the data to, buf is the start of the |
255 |
|
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* data, and len is the number of bytes to add. |
256 |
|
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*/ |
257 |
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|
258 |
|
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static void add_to_buffer(NewSocket *ns, unsigned char *buf, int len) |
259 |
|
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{ |
260 |
|
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int avail, end; |
261 |
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|
262 |
|
|
if ((len+ns->outputbuffer.len)>SOCKETBUFSIZE) { |
263 |
|
|
LOG(llevDebug,"Socket on fd %d has overrun internal buffer - marking as dead\n", |
264 |
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ns->fd); |
265 |
|
|
ns->status = Ns_Dead; |
266 |
|
|
return; |
267 |
|
|
} |
268 |
|
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|
269 |
|
|
/* data + end is where we start putting the new data. The last byte |
270 |
|
|
* currently in use is actually data + end -1 |
271 |
|
|
*/ |
272 |
|
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|
273 |
|
|
end=ns->outputbuffer.start + ns->outputbuffer.len; |
274 |
|
|
/* The buffer is already in a wrapped state, so adjust end */ |
275 |
|
|
if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE; |
276 |
|
|
avail=SOCKETBUFSIZE - end; |
277 |
|
|
|
278 |
|
|
/* We can all fit it behind the current data without wrapping */ |
279 |
|
|
if (avail >=len ) { |
280 |
|
|
memcpy(ns->outputbuffer.data + end, buf, len); |
281 |
|
|
} |
282 |
|
|
else { |
283 |
|
|
memcpy(ns->outputbuffer.data + end, buf, avail); |
284 |
|
|
memcpy(ns->outputbuffer.data, buf+avail, len-avail); |
285 |
|
|
} |
286 |
|
|
ns->outputbuffer.len += len; |
287 |
|
|
#if 0 |
288 |
|
|
LOG(llevDebug,"Added %d to output buffer, total length now %d, start=%d\n", len, |
289 |
|
|
ns->outputbuffer.len, ns->outputbuffer.start); |
290 |
|
|
#endif |
291 |
|
|
} |
292 |
|
|
|
293 |
|
|
/** |
294 |
|
|
* Writes data to socket. |
295 |
|
|
* |
296 |
|
|
* When the socket is clear to write, and we have backlogged data, this |
297 |
|
|
* is called to write it out. |
298 |
|
|
*/ |
299 |
|
|
void write_socket_buffer(NewSocket *ns) |
300 |
|
|
{ |
301 |
|
|
int amt, max; |
302 |
|
|
|
303 |
|
|
if (ns->outputbuffer.len==0) { |
304 |
|
|
LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n", |
305 |
|
|
ns->fd); |
306 |
|
|
return; |
307 |
|
|
} |
308 |
|
|
|
309 |
|
|
do { |
310 |
|
|
max = SOCKETBUFSIZE - ns->outputbuffer.start; |
311 |
|
|
if (ns->outputbuffer.len<max) max = ns->outputbuffer.len; |
312 |
|
|
|
313 |
|
|
#ifdef WIN32 /* ***win32 write_socket_buffer: change write() to send() */ |
314 |
|
|
amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0); |
315 |
|
|
#else |
316 |
|
|
do { |
317 |
|
|
amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
318 |
|
|
} while ((amt<0) && (errno==EINTR)); |
319 |
|
|
#endif |
320 |
|
|
|
321 |
|
|
if (amt < 0) { /* We got an error */ |
322 |
|
|
|
323 |
|
|
#ifdef WIN32 /* ***win32 write_socket_buffer: change error handling */ |
324 |
|
|
if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) { |
325 |
|
|
LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError()); |
326 |
|
|
#else |
327 |
|
|
if (errno !=EWOULDBLOCK) { |
328 |
|
|
LOG(llevError,"New socket write failed (wsb) (%d: %s).\n", |
329 |
|
|
errno, strerror_local(errno)); |
330 |
|
|
#endif |
331 |
|
|
ns->status=Ns_Dead; |
332 |
|
|
return; |
333 |
|
|
} |
334 |
|
|
else { /* EWOULDBLOCK */ |
335 |
|
|
/* can't write it, so store it away. */ |
336 |
|
|
ns->can_write=0; |
337 |
|
|
return; |
338 |
|
|
} |
339 |
|
|
} |
340 |
|
|
ns->outputbuffer.start += amt; |
341 |
|
|
/* wrap back to start of buffer */ |
342 |
|
|
if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0; |
343 |
|
|
ns->outputbuffer.len -= amt; |
344 |
|
|
#ifdef CS_LOGSTATS |
345 |
|
|
cst_tot.obytes += amt; |
346 |
|
|
cst_lst.obytes += amt; |
347 |
|
|
#endif |
348 |
|
|
} while (ns->outputbuffer.len>0); |
349 |
|
|
} |
350 |
|
|
|
351 |
|
|
/** |
352 |
|
|
* This writes data to the socket. - It is very low level - |
353 |
|
|
* all we try and do is write out the data to the socket |
354 |
|
|
* provided (ns). buf is the data to write, len is the number |
355 |
|
|
* of bytes to write. IT doesn't return anything - rather, it |
356 |
|
|
* updates the ns structure if we get an error. |
357 |
|
|
*/ |
358 |
|
|
void Write_To_Socket(NewSocket *ns, unsigned char *buf, int len) |
359 |
|
|
{ |
360 |
|
|
int amt=0; |
361 |
|
|
unsigned char *pos=buf; |
362 |
|
|
|
363 |
|
|
if (ns->status == Ns_Dead || !buf) { |
364 |
|
|
LOG(llevDebug,"Write_To_Socket called with dead socket\n"); |
365 |
|
|
return; |
366 |
|
|
} |
367 |
|
|
|
368 |
|
|
#ifndef __GNU__ /* This caused problems on Hurd */ |
369 |
|
|
if (!ns->can_write) { |
370 |
|
|
add_to_buffer(ns, buf, len); |
371 |
|
|
return; |
372 |
|
|
} |
373 |
|
|
#endif |
374 |
|
|
/* If we manage to write more than we wanted, take it as a bonus */ |
375 |
|
|
while (len>0) { |
376 |
|
|
|
377 |
|
|
#ifdef WIN32 /* ***win32 Write_To_Socket: change write() to send() */ |
378 |
|
|
amt=send(ns->fd, pos, len,0); |
379 |
|
|
#else |
380 |
|
|
do { |
381 |
|
|
amt=write(ns->fd, pos, len); |
382 |
|
|
} while ((amt<0) && (errno==EINTR)); |
383 |
|
|
#endif |
384 |
|
|
|
385 |
|
|
if (amt < 0) { /* We got an error */ |
386 |
|
|
#ifdef WIN32 /* ***win32 Write_To_Socket: change error handling */ |
387 |
|
|
if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) { |
388 |
|
|
LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError()); |
389 |
|
|
#else |
390 |
|
|
if (errno !=EWOULDBLOCK) { |
391 |
|
|
LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
392 |
|
|
errno, strerror_local(errno)); |
393 |
|
|
#endif |
394 |
|
|
ns->status=Ns_Dead; |
395 |
|
|
return; |
396 |
|
|
} |
397 |
|
|
else { /* EWOULDBLOCK */ |
398 |
|
|
/* can't write it, so store it away. */ |
399 |
|
|
add_to_buffer(ns, pos, len); |
400 |
|
|
ns->can_write=0; |
401 |
|
|
return; |
402 |
|
|
} |
403 |
|
|
} |
404 |
|
|
/* amt gets set to 0 above in blocking code, so we do this as |
405 |
|
|
* an else if to make sure we don't reprocess it. |
406 |
|
|
*/ |
407 |
|
|
else if (amt==0) { |
408 |
|
|
LOG(llevError,"Write_To_Socket: No data written out.\n"); |
409 |
|
|
} |
410 |
|
|
len -= amt; |
411 |
|
|
pos += amt; |
412 |
|
|
#ifdef CS_LOGSTATS |
413 |
|
|
cst_tot.obytes += amt; |
414 |
|
|
cst_lst.obytes += amt; |
415 |
|
|
#endif |
416 |
|
|
} |
417 |
|
|
} |
418 |
|
|
|
419 |
|
|
|
420 |
|
|
/** |
421 |
|
|
* Takes a string of data, and writes it out to the socket. A very handy |
422 |
|
|
* shortcut function. |
423 |
|
|
*/ |
424 |
|
|
void cs_write_string(NewSocket *ns, const char *buf, int len) |
425 |
|
|
{ |
426 |
|
|
SockList sl; |
427 |
|
|
|
428 |
|
|
sl.len = len; |
429 |
|
|
sl.buf = (unsigned char*)buf; |
430 |
|
|
Send_With_Handling(ns, &sl); |
431 |
|
|
} |
432 |
|
|
|
433 |
|
|
|
434 |
|
|
/** |
435 |
|
|
* Calls Write_To_Socket to send data to the client. |
436 |
|
|
* |
437 |
|
|
* The only difference in this function is that we take a SockList |
438 |
|
|
*, and we prepend the length information. |
439 |
|
|
*/ |
440 |
|
|
void Send_With_Handling(NewSocket *ns,SockList *msg) |
441 |
|
|
{ |
442 |
|
|
unsigned char sbuf[4]; |
443 |
|
|
|
444 |
|
|
if (ns->status == Ns_Dead || !msg) |
445 |
|
|
return; |
446 |
|
|
|
447 |
|
|
if (msg->len >= MAXSOCKBUF) { |
448 |
|
|
LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n", |
449 |
|
|
msg->len); |
450 |
|
|
/* Almost certainly we've overflowed a buffer, so quite now to make |
451 |
|
|
* it easier to debug. |
452 |
|
|
*/ |
453 |
|
|
abort(); |
454 |
|
|
} |
455 |
|
|
sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF; |
456 |
|
|
sbuf[1] = ((uint32)(msg->len)) & 0xFF; |
457 |
|
|
if (ns->status != Ns_Old) |
458 |
|
|
Write_To_Socket(ns, sbuf, 2); |
459 |
|
|
Write_To_Socket(ns, msg->buf, msg->len); |
460 |
|
|
} |
461 |
|
|
|
462 |
|
|
/** |
463 |
|
|
* Takes a string of data, and writes it out to the socket. A very handy |
464 |
|
|
* shortcut function. |
465 |
|
|
*/ |
466 |
|
|
void Write_String_To_Socket(NewSocket *ns, char *buf, int len) |
467 |
|
|
{ |
468 |
|
|
SockList sl; |
469 |
|
|
|
470 |
|
|
sl.len = len; |
471 |
|
|
sl.buf = (uint8*)buf; |
472 |
|
|
Send_With_Handling(ns, &sl); |
473 |
|
|
} |
474 |
|
|
|
475 |
|
|
|
476 |
|
|
/****************************************************************************** |
477 |
|
|
* |
478 |
|
|
* statistics logging functions. |
479 |
|
|
* |
480 |
|
|
******************************************************************************/ |
481 |
|
|
|
482 |
|
|
#ifdef CS_LOGSTATS |
483 |
|
|
/* cst_tot is for the life of the server, cst_last is for the last series of |
484 |
|
|
* stats |
485 |
|
|
*/ |
486 |
|
|
CS_Stats cst_tot, cst_lst; |
487 |
|
|
|
488 |
|
|
/** |
489 |
|
|
* Writes out the gathered stats. We clear cst_lst. |
490 |
|
|
*/ |
491 |
|
|
void write_cs_stats(void) |
492 |
|
|
{ |
493 |
|
|
time_t now=time(NULL); |
494 |
|
|
|
495 |
|
|
/* If no connections recently, don't both to log anything */ |
496 |
|
|
if (cst_lst.ibytes==0 && cst_lst.obytes==0) return; |
497 |
|
|
|
498 |
|
|
/* CSSTAT is put in so scripts can easily find the line */ |
499 |
|
|
LOG(llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
500 |
|
|
ctime(&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
501 |
|
|
now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, |
502 |
|
|
cst_lst.max_conn, now - cst_lst.time_start); |
503 |
|
|
cst_lst.ibytes=0; |
504 |
|
|
cst_lst.obytes=0; |
505 |
|
|
cst_lst.max_conn=socket_info.nconns; |
506 |
|
|
cst_lst.time_start=now; |
507 |
|
|
} |
508 |
|
|
#endif |