1 |
elmex |
1.1 |
/* |
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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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using namespace std; |
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#include <global.h> |
38 |
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#include <newclient.h> |
39 |
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#include <sproto.h> |
40 |
root |
1.11 |
#include <cstdarg> |
41 |
elmex |
1.1 |
|
42 |
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#ifdef __linux__ |
43 |
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# include <sys/types.h> |
44 |
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# include <sys/socket.h> |
45 |
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# include <netinet/in.h> |
46 |
root |
1.5 |
# define TCP_HZ 1000 // sorry... |
47 |
elmex |
1.1 |
# include <netinet/tcp.h> |
48 |
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#endif |
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50 |
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// use a really low timeout, as it doesn't cost any bandwidth, and you can |
51 |
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// easily die in 20 seconds... |
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#define SOCKET_TIMEOUT1 10 |
53 |
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#define SOCKET_TIMEOUT2 20 |
54 |
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55 |
root |
1.5 |
void |
56 |
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Socket_Flush (NewSocket * ns) |
57 |
elmex |
1.1 |
{ |
58 |
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#ifdef __linux__ |
59 |
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// check time of last ack, and, if too old, kill connection |
60 |
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struct tcp_info tcpi; |
61 |
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socklen_t len = sizeof (tcpi); |
62 |
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63 |
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if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
64 |
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{ |
65 |
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unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
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67 |
root |
1.5 |
if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s |
68 |
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&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s |
69 |
elmex |
1.1 |
{ |
70 |
root |
1.3 |
LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, |
71 |
root |
1.5 |
(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
72 |
elmex |
1.1 |
ns->status = Ns_Dead; |
73 |
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} |
74 |
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} |
75 |
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76 |
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int val; |
77 |
root |
1.5 |
|
78 |
root |
1.9 |
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)); |
80 |
elmex |
1.1 |
#endif |
81 |
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} |
82 |
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83 |
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/*********************************************************************** |
84 |
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* |
85 |
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* SockList functions/utilities |
86 |
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* |
87 |
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**********************************************************************/ |
88 |
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89 |
root |
1.11 |
SockList &SockList::operator <<(const data &v) |
90 |
elmex |
1.1 |
{ |
91 |
root |
1.11 |
if (v.len) |
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{ |
93 |
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memcpy (buf + len, v.ptr, v.len); |
94 |
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len += v.len; |
95 |
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} |
96 |
root |
1.9 |
|
97 |
root |
1.11 |
return *this; |
98 |
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} |
99 |
root |
1.9 |
|
100 |
root |
1.11 |
SockList &SockList::operator <<(const data8 &v) |
101 |
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{ |
102 |
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unsigned int len = min (v.len, 0x00FF); |
103 |
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return *this << uint8 (len) << data (v.ptr, len); |
104 |
elmex |
1.1 |
} |
105 |
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106 |
root |
1.9 |
SockList &SockList::operator <<(const data16 &v) |
107 |
elmex |
1.1 |
{ |
108 |
root |
1.11 |
unsigned int len = min (v.len, 0xFFFF); |
109 |
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return *this << uint16 (len) << data (v.ptr, len); |
110 |
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} |
111 |
root |
1.9 |
|
112 |
root |
1.11 |
SockList &SockList::operator <<(const char *v) |
113 |
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{ |
114 |
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return *this << data (v, strlen (v ? v : 0)); |
115 |
elmex |
1.1 |
} |
116 |
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117 |
root |
1.11 |
void |
118 |
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SockList::printf (const char *format, ...) |
119 |
root |
1.10 |
{ |
120 |
root |
1.11 |
va_list ap; |
121 |
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va_start (ap, format); |
122 |
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123 |
root |
1.13 |
len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap); |
124 |
root |
1.10 |
|
125 |
root |
1.11 |
va_end (ap); |
126 |
root |
1.10 |
} |
127 |
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128 |
elmex |
1.1 |
/****************************************************************************** |
129 |
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* |
130 |
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* Start of read routines. |
131 |
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* |
132 |
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******************************************************************************/ |
133 |
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134 |
root |
1.5 |
int |
135 |
root |
1.12 |
NewSocket::read_packet () |
136 |
elmex |
1.1 |
{ |
137 |
root |
1.12 |
for (;;) |
138 |
root |
1.5 |
{ |
139 |
root |
1.12 |
if (inbuf_len >= 2) |
140 |
root |
1.5 |
{ |
141 |
root |
1.12 |
unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; |
142 |
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143 |
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if (inbuf_len >= 2 + pkt_len) |
144 |
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return pkt_len + 2; |
145 |
root |
1.5 |
} |
146 |
pippijn |
1.8 |
|
147 |
root |
1.12 |
int amount = sizeof (inbuf) - inbuf_len; |
148 |
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149 |
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if (amount <= 0) |
150 |
root |
1.5 |
{ |
151 |
root |
1.12 |
LOG (llevError, "packet too large");//TODO |
152 |
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return -1; |
153 |
root |
1.3 |
} |
154 |
elmex |
1.1 |
|
155 |
root |
1.12 |
amount = read (fd, inbuf + inbuf_len, amount); |
156 |
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157 |
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if (!amount) |
158 |
root |
1.5 |
{ |
159 |
root |
1.12 |
status = Ns_Dead; |
160 |
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return -1; |
161 |
root |
1.5 |
} |
162 |
root |
1.12 |
else if (amount < 0) |
163 |
root |
1.5 |
{ |
164 |
root |
1.12 |
if (errno != EAGAIN && errno != EINTR) |
165 |
root |
1.5 |
{ |
166 |
root |
1.12 |
LOG (llevError, "read error: %s", strerror (errno)); |
167 |
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return -1; |
168 |
root |
1.3 |
} |
169 |
root |
1.12 |
|
170 |
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return 0; |
171 |
root |
1.3 |
} |
172 |
root |
1.12 |
|
173 |
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inbuf_len += amount; |
174 |
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175 |
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cst_tot.ibytes += amount; |
176 |
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cst_lst.ibytes += amount; |
177 |
root |
1.5 |
} |
178 |
root |
1.12 |
} |
179 |
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180 |
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void |
181 |
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NewSocket::skip_packet (int len) |
182 |
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{ |
183 |
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inbuf_len -= len; |
184 |
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memmove (inbuf, inbuf + len, inbuf_len); |
185 |
elmex |
1.1 |
} |
186 |
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187 |
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/******************************************************************************* |
188 |
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* |
189 |
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* Start of write related routines. |
190 |
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* |
191 |
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******************************************************************************/ |
192 |
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193 |
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/** |
194 |
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* Adds data to a socket buffer for whatever reason. |
195 |
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* |
196 |
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* ns is the socket we are adding the data to, buf is the start of the |
197 |
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* data, and len is the number of bytes to add. |
198 |
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*/ |
199 |
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200 |
root |
1.5 |
static void |
201 |
root |
1.12 |
add_to_buffer (NewSocket *ns, char *buf, int len) |
202 |
elmex |
1.1 |
{ |
203 |
root |
1.5 |
int avail, end; |
204 |
elmex |
1.1 |
|
205 |
root |
1.5 |
if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE) |
206 |
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{ |
207 |
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LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd); |
208 |
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ns->status = Ns_Dead; |
209 |
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return; |
210 |
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} |
211 |
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212 |
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/* data + end is where we start putting the new data. The last byte |
213 |
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* currently in use is actually data + end -1 |
214 |
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*/ |
215 |
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216 |
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end = ns->outputbuffer.start + ns->outputbuffer.len; |
217 |
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/* The buffer is already in a wrapped state, so adjust end */ |
218 |
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if (end >= SOCKETBUFSIZE) |
219 |
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end -= SOCKETBUFSIZE; |
220 |
root |
1.7 |
|
221 |
root |
1.5 |
avail = SOCKETBUFSIZE - end; |
222 |
elmex |
1.1 |
|
223 |
root |
1.5 |
/* We can all fit it behind the current data without wrapping */ |
224 |
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if (avail >= len) |
225 |
root |
1.7 |
memcpy (ns->outputbuffer.data + end, buf, len); |
226 |
root |
1.5 |
else |
227 |
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{ |
228 |
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memcpy (ns->outputbuffer.data + end, buf, avail); |
229 |
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memcpy (ns->outputbuffer.data, buf + avail, len - avail); |
230 |
elmex |
1.1 |
} |
231 |
root |
1.7 |
|
232 |
root |
1.5 |
ns->outputbuffer.len += len; |
233 |
elmex |
1.1 |
#if 0 |
234 |
root |
1.5 |
LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start); |
235 |
elmex |
1.1 |
#endif |
236 |
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} |
237 |
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238 |
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/** |
239 |
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* Writes data to socket. |
240 |
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* |
241 |
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* When the socket is clear to write, and we have backlogged data, this |
242 |
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* is called to write it out. |
243 |
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*/ |
244 |
root |
1.5 |
void |
245 |
|
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write_socket_buffer (NewSocket * ns) |
246 |
elmex |
1.1 |
{ |
247 |
root |
1.5 |
int amt, max; |
248 |
elmex |
1.1 |
|
249 |
root |
1.5 |
if (ns->outputbuffer.len == 0) |
250 |
|
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{ |
251 |
|
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LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd); |
252 |
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return; |
253 |
elmex |
1.1 |
} |
254 |
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|
255 |
root |
1.5 |
do |
256 |
|
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{ |
257 |
|
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max = SOCKETBUFSIZE - ns->outputbuffer.start; |
258 |
|
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if (ns->outputbuffer.len < max) |
259 |
|
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max = ns->outputbuffer.len; |
260 |
elmex |
1.1 |
|
261 |
root |
1.5 |
do |
262 |
|
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{ |
263 |
|
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amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
264 |
|
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} |
265 |
|
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while ((amt < 0) && (errno == EINTR)); |
266 |
elmex |
1.1 |
|
267 |
root |
1.5 |
if (amt < 0) |
268 |
|
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{ /* We got an error */ |
269 |
elmex |
1.1 |
|
270 |
root |
1.5 |
if (errno != EWOULDBLOCK) |
271 |
|
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{ |
272 |
|
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LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno)); |
273 |
|
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ns->status = Ns_Dead; |
274 |
|
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return; |
275 |
root |
1.3 |
} |
276 |
root |
1.5 |
else |
277 |
|
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{ /* EWOULDBLOCK */ |
278 |
|
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/* can't write it, so store it away. */ |
279 |
|
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ns->can_write = 0; |
280 |
|
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return; |
281 |
root |
1.3 |
} |
282 |
|
|
} |
283 |
root |
1.5 |
ns->outputbuffer.start += amt; |
284 |
|
|
/* wrap back to start of buffer */ |
285 |
|
|
if (ns->outputbuffer.start == SOCKETBUFSIZE) |
286 |
|
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ns->outputbuffer.start = 0; |
287 |
|
|
ns->outputbuffer.len -= amt; |
288 |
elmex |
1.1 |
#ifdef CS_LOGSTATS |
289 |
root |
1.5 |
cst_tot.obytes += amt; |
290 |
|
|
cst_lst.obytes += amt; |
291 |
|
|
#endif |
292 |
|
|
} |
293 |
|
|
while (ns->outputbuffer.len > 0); |
294 |
elmex |
1.1 |
} |
295 |
|
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|
296 |
|
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/** |
297 |
|
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* This writes data to the socket. - It is very low level - |
298 |
|
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* all we try and do is write out the data to the socket |
299 |
|
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* provided (ns). buf is the data to write, len is the number |
300 |
|
|
* of bytes to write. IT doesn't return anything - rather, it |
301 |
|
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* updates the ns structure if we get an error. |
302 |
|
|
*/ |
303 |
root |
1.5 |
void |
304 |
|
|
Write_To_Socket (NewSocket * ns, char *buf, int len) |
305 |
elmex |
1.1 |
{ |
306 |
root |
1.5 |
int amt = 0; |
307 |
|
|
char *pos = buf; |
308 |
elmex |
1.1 |
|
309 |
root |
1.5 |
if (ns->status == Ns_Dead || !buf) |
310 |
|
|
{ |
311 |
|
|
LOG (llevDebug, "Write_To_Socket called with dead socket\n"); |
312 |
|
|
return; |
313 |
elmex |
1.1 |
} |
314 |
root |
1.5 |
|
315 |
|
|
#ifndef __GNU__ /* This caused problems on Hurd */ |
316 |
|
|
if (!ns->can_write) |
317 |
|
|
{ |
318 |
|
|
add_to_buffer (ns, buf, len); |
319 |
|
|
return; |
320 |
elmex |
1.1 |
} |
321 |
|
|
#endif |
322 |
root |
1.5 |
/* If we manage to write more than we wanted, take it as a bonus */ |
323 |
|
|
while (len > 0) |
324 |
|
|
{ |
325 |
elmex |
1.1 |
|
326 |
root |
1.5 |
do |
327 |
|
|
{ |
328 |
|
|
amt = write (ns->fd, pos, len); |
329 |
|
|
} |
330 |
|
|
while ((amt < 0) && (errno == EINTR)); |
331 |
elmex |
1.1 |
|
332 |
root |
1.5 |
if (amt < 0) |
333 |
|
|
{ /* We got an error */ |
334 |
|
|
if (errno != EWOULDBLOCK) |
335 |
|
|
{ |
336 |
|
|
LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
337 |
|
|
errno, strerror (errno)); |
338 |
|
|
ns->status = Ns_Dead; |
339 |
|
|
return; |
340 |
root |
1.3 |
} |
341 |
root |
1.5 |
else |
342 |
|
|
{ /* EWOULDBLOCK */ |
343 |
|
|
/* can't write it, so store it away. */ |
344 |
|
|
add_to_buffer (ns, pos, len); |
345 |
|
|
ns->can_write = 0; |
346 |
|
|
return; |
347 |
root |
1.3 |
} |
348 |
|
|
} |
349 |
root |
1.5 |
/* amt gets set to 0 above in blocking code, so we do this as |
350 |
|
|
* an else if to make sure we don't reprocess it. |
351 |
|
|
*/ |
352 |
|
|
else if (amt == 0) |
353 |
|
|
{ |
354 |
|
|
LOG (llevError, "Write_To_Socket: No data written out.\n"); |
355 |
root |
1.3 |
} |
356 |
root |
1.5 |
len -= amt; |
357 |
|
|
pos += amt; |
358 |
elmex |
1.1 |
#ifdef CS_LOGSTATS |
359 |
root |
1.5 |
cst_tot.obytes += amt; |
360 |
|
|
cst_lst.obytes += amt; |
361 |
|
|
#endif |
362 |
elmex |
1.1 |
} |
363 |
|
|
} |
364 |
|
|
|
365 |
|
|
/** |
366 |
|
|
* Takes a string of data, and writes it out to the socket. A very handy |
367 |
|
|
* shortcut function. |
368 |
|
|
*/ |
369 |
root |
1.13 |
|
370 |
|
|
void |
371 |
|
|
NewSocket::send_packet (SockList &sl) |
372 |
|
|
{ |
373 |
|
|
Send_With_Handling (this, &sl); |
374 |
|
|
} |
375 |
|
|
|
376 |
root |
1.5 |
void |
377 |
root |
1.13 |
NewSocket::send_packet (const char *buf, int len) |
378 |
elmex |
1.1 |
{ |
379 |
root |
1.13 |
SockList sl (MAXSOCKBUF); |
380 |
elmex |
1.1 |
|
381 |
root |
1.13 |
sl << data (buf, len); |
382 |
|
|
send_packet (sl); |
383 |
|
|
sl.free (); |
384 |
elmex |
1.1 |
} |
385 |
|
|
|
386 |
root |
1.13 |
void |
387 |
|
|
NewSocket::send_packet (const char *buf) |
388 |
|
|
{ |
389 |
|
|
send_packet (buf, strlen (buf)); |
390 |
|
|
} |
391 |
elmex |
1.1 |
|
392 |
|
|
/** |
393 |
|
|
* Calls Write_To_Socket to send data to the client. |
394 |
|
|
* |
395 |
|
|
* The only difference in this function is that we take a SockList |
396 |
|
|
*, and we prepend the length information. |
397 |
|
|
*/ |
398 |
root |
1.5 |
void |
399 |
root |
1.11 |
Send_With_Handling (NewSocket *ns, SockList *msg) |
400 |
elmex |
1.1 |
{ |
401 |
root |
1.5 |
unsigned char sbuf[4]; |
402 |
elmex |
1.1 |
|
403 |
root |
1.5 |
if (ns->status == Ns_Dead || !msg) |
404 |
|
|
return; |
405 |
elmex |
1.1 |
|
406 |
root |
1.5 |
if (msg->len >= MAXSOCKBUF) |
407 |
|
|
{ |
408 |
|
|
LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); |
409 |
|
|
/* Almost certainly we've overflowed a buffer, so quite now to make |
410 |
|
|
* it easier to debug. |
411 |
|
|
*/ |
412 |
|
|
abort (); |
413 |
|
|
} |
414 |
|
|
sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF; |
415 |
|
|
sbuf[1] = ((uint32) (msg->len)) & 0xFF; |
416 |
|
|
if (ns->status != Ns_Old) |
417 |
|
|
Write_To_Socket (ns, (char *) sbuf, 2); |
418 |
|
|
Write_To_Socket (ns, (char *) msg->buf, msg->len); |
419 |
elmex |
1.1 |
} |
420 |
|
|
|
421 |
|
|
/****************************************************************************** |
422 |
|
|
* |
423 |
|
|
* statistics logging functions. |
424 |
|
|
* |
425 |
|
|
******************************************************************************/ |
426 |
|
|
|
427 |
|
|
#ifdef CS_LOGSTATS |
428 |
root |
1.5 |
|
429 |
elmex |
1.1 |
/* cst_tot is for the life of the server, cst_last is for the last series of |
430 |
|
|
* stats |
431 |
|
|
*/ |
432 |
|
|
CS_Stats cst_tot, cst_lst; |
433 |
|
|
|
434 |
|
|
/** |
435 |
|
|
* Writes out the gathered stats. We clear cst_lst. |
436 |
|
|
*/ |
437 |
root |
1.5 |
void |
438 |
|
|
write_cs_stats (void) |
439 |
elmex |
1.1 |
{ |
440 |
root |
1.5 |
time_t now = time (NULL); |
441 |
elmex |
1.1 |
|
442 |
root |
1.5 |
/* If no connections recently, don't both to log anything */ |
443 |
|
|
if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
444 |
|
|
return; |
445 |
|
|
|
446 |
|
|
/* CSSTAT is put in so scripts can easily find the line */ |
447 |
|
|
LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
448 |
|
|
ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
449 |
|
|
now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
450 |
|
|
cst_lst.ibytes = 0; |
451 |
|
|
cst_lst.obytes = 0; |
452 |
|
|
cst_lst.max_conn = socket_info.nconns; |
453 |
|
|
cst_lst.time_start = now; |
454 |
elmex |
1.1 |
} |
455 |
|
|
#endif |
456 |
root |
1.9 |
|