1 | |
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2 | /* |
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3 | * static char *rcsid_sockets_c = |
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4 | * "$Id: lowlevel.C,v 1.5 2006/09/10 13:43:33 root Exp $"; |
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5 | */ |
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6 | |
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7 | /* |
1 | /* |
8 | CrossFire, A Multiplayer game for X-windows |
2 | CrossFire, A Multiplayer game for X-windows |
9 | |
3 | |
10 | Copyright (C) 1992 Frank Tore Johansen |
4 | Copyright (C) 1992 Frank Tore Johansen |
11 | |
5 | |
… | |
… | |
41 | using namespace std; |
35 | using namespace std; |
42 | |
36 | |
43 | #include <global.h> |
37 | #include <global.h> |
44 | #include <newclient.h> |
38 | #include <newclient.h> |
45 | #include <sproto.h> |
39 | #include <sproto.h> |
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40 | #include <cstdarg> |
46 | |
41 | |
47 | #ifdef __linux__ |
42 | #ifdef __linux__ |
48 | # include <sys/types.h> |
43 | # include <sys/types.h> |
49 | # include <sys/socket.h> |
44 | # include <sys/socket.h> |
50 | # include <netinet/in.h> |
45 | # include <netinet/in.h> |
… | |
… | |
78 | } |
73 | } |
79 | } |
74 | } |
80 | |
75 | |
81 | int val; |
76 | int val; |
82 | |
77 | |
83 | val = 0; |
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84 | setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
78 | val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
85 | val = 1; |
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86 | setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
79 | val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
87 | #endif |
80 | #endif |
88 | } |
81 | } |
89 | |
82 | |
90 | /*********************************************************************** |
83 | /*********************************************************************** |
91 | * |
84 | * |
92 | * SockList functions/utilities |
85 | * packet functions/utilities |
93 | * |
86 | * |
94 | **********************************************************************/ |
87 | **********************************************************************/ |
95 | |
88 | |
96 | void |
89 | packet &packet::operator <<(const data &v) |
97 | SockList_Init (SockList * sl) |
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98 | { |
90 | { |
99 | sl->len = 0; |
91 | if (v.len) |
100 | sl->buf = NULL; |
92 | { |
101 | } |
93 | memcpy (buf + len, v.ptr, v.len); |
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94 | len += v.len; |
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95 | } |
102 | |
96 | |
103 | void |
97 | return *this; |
104 | SockList_AddInt (SockList * sl, uint32 data) |
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105 | { |
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106 | sl->buf[sl->len++] = (data >> 24) & 0xff; |
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107 | sl->buf[sl->len++] = (data >> 16) & 0xff; |
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108 | sl->buf[sl->len++] = (data >> 8) & 0xff; |
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109 | sl->buf[sl->len++] = data & 0xff; |
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110 | } |
98 | } |
111 | |
99 | |
112 | void |
100 | packet &packet::operator <<(const data8 &v) |
113 | SockList_AddInt64 (SockList * sl, uint64 data) |
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114 | { |
101 | { |
115 | sl->buf[sl->len++] = (char) ((data >> 56) & 0xff); |
102 | unsigned int len = min (v.len, 0x00FF); |
116 | sl->buf[sl->len++] = (char) ((data >> 48) & 0xff); |
103 | return *this << uint8 (len) << data (v.ptr, len); |
117 | sl->buf[sl->len++] = (char) ((data >> 40) & 0xff); |
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118 | sl->buf[sl->len++] = (char) ((data >> 32) & 0xff); |
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119 | |
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120 | sl->buf[sl->len++] = (char) ((data >> 24) & 0xff); |
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121 | sl->buf[sl->len++] = (char) ((data >> 16) & 0xff); |
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122 | sl->buf[sl->len++] = (char) ((data >> 8) & 0xff); |
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123 | sl->buf[sl->len++] = (char) (data & 0xff); |
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124 | } |
104 | } |
125 | |
105 | |
126 | /* Basically does the reverse of SockList_AddInt, but on |
106 | packet &packet::operator <<(const data16 &v) |
127 | * strings instead. Same for the GetShort, but for 16 bits. |
107 | { |
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108 | unsigned int len = min (v.len, 0xFFFF); |
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109 | return *this << uint16 (len) << data (v.ptr, len); |
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110 | } |
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111 | |
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112 | packet &packet::operator <<(const char *v) |
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113 | { |
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114 | return *this << data (v, strlen (v ? v : 0)); |
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115 | } |
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116 | |
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117 | void |
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118 | packet::printf (const char *format, ...) |
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119 | { |
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120 | va_list ap; |
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121 | va_start (ap, format); |
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122 | |
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123 | len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap); |
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124 | |
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125 | va_end (ap); |
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126 | } |
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127 | |
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128 | /****************************************************************************** |
128 | */ |
129 | * |
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130 | * Start of read routines. |
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131 | * |
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132 | ******************************************************************************/ |
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133 | |
129 | int |
134 | int |
130 | GetInt_String (unsigned char *data) |
135 | NewSocket::read_packet () |
131 | { |
136 | { |
132 | return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]); |
137 | for (;;) |
133 | } |
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134 | |
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135 | short |
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136 | GetShort_String (unsigned char *data) |
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137 | { |
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138 | return ((data[0] << 8) + data[1]); |
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139 | } |
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140 | |
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141 | /****************************************************************************** |
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142 | * |
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143 | * Start of read routines. |
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144 | * |
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145 | ******************************************************************************/ |
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146 | |
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147 | /** |
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148 | * This reads from fd and puts the data in sl. We return true if we think |
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149 | * we have a full packet, 0 if we have a partial packet. The only processing |
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150 | * we do is remove the intial size value. len (As passed) is the size of the |
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151 | * buffer allocated in the socklist. We make the assumption the buffer is |
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152 | * at least 2 bytes long. |
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153 | */ |
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154 | |
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155 | int |
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156 | SockList_ReadPacket (int fd, SockList * sl, int len) |
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157 | { |
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158 | int stat, toread; |
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159 | |
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160 | /* Sanity check - shouldn't happen */ |
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161 | if (sl->len < 0) |
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162 | { |
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163 | abort (); |
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164 | } |
138 | { |
165 | /* We already have a partial packet */ |
139 | if (inbuf_len >= 2) |
166 | if (sl->len < 2) |
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167 | { |
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168 | #ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */ |
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169 | |
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170 | stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0); |
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171 | |
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172 | #else |
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173 | do |
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174 | { |
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175 | stat = read (fd, sl->buf + sl->len, 2 - sl->len); |
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176 | } |
140 | { |
177 | while ((stat == -1) && (errno == EINTR)); |
141 | unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; |
178 | #endif |
142 | |
179 | if (stat < 0) |
143 | if (inbuf_len >= 2 + pkt_len) |
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144 | return pkt_len + 2; |
180 | { |
145 | } |
181 | /* In non blocking mode, EAGAIN is set when there is no |
146 | |
182 | * data available. |
147 | int amount = sizeof (inbuf) - inbuf_len; |
183 | */ |
148 | |
184 | #ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ |
149 | if (amount <= 0) |
185 | if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK) |
150 | { |
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151 | LOG (llevError, "packet too large");//TODO |
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152 | return -1; |
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153 | } |
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154 | |
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155 | amount = read (fd, inbuf + inbuf_len, amount); |
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156 | |
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157 | if (!amount) |
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158 | { |
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159 | status = Ns_Dead; |
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160 | return -1; |
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161 | } |
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162 | else if (amount < 0) |
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163 | { |
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164 | if (errno != EAGAIN && errno != EINTR) |
186 | { |
165 | { |
187 | if (WSAGetLastError () == WSAECONNRESET) |
166 | LOG (llevError, "read error: %s", strerror (errno)); |
188 | LOG (llevDebug, "Connection closed by client\n"); |
167 | return -1; |
189 | else |
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190 | { |
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191 | LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ()); |
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192 | } |
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193 | return -1; /* kick this user! */ |
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194 | } |
168 | } |
195 | #else |
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196 | if (errno != EAGAIN && errno != EWOULDBLOCK) |
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197 | { |
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198 | LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); |
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199 | } |
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200 | #endif |
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201 | return 0; /*Error */ |
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202 | } |
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203 | if (stat == 0) |
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204 | return -1; |
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205 | sl->len += stat; |
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206 | #ifdef CS_LOGSTATS |
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207 | cst_tot.ibytes += stat; |
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208 | cst_lst.ibytes += stat; |
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209 | #endif |
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210 | if (stat < 2) |
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211 | return 0; /* Still don't have a full packet */ |
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212 | } |
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213 | /* Figure out how much more data we need to read. Add 2 from the |
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214 | * end of this - size header information is not included. |
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215 | */ |
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216 | toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len; |
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217 | if ((toread + sl->len) >= len) |
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218 | { |
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219 | LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len); |
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220 | /* Quick hack in case for 'oldsocketmode' input. If we are |
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221 | * closing the socket anyways, then reading this extra 100 bytes |
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222 | * shouldn't hurt. |
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223 | */ |
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224 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */ |
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225 | recv (fd, sl->buf + 2, 100, 0); |
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226 | #else |
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227 | read (fd, sl->buf + 2, 100); |
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228 | #endif /* end win32 */ |
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229 | |
169 | |
230 | /* return error so the socket is closed */ |
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231 | return -1; |
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232 | } |
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233 | do |
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234 | { |
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235 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */ |
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236 | stat = recv (fd, sl->buf + sl->len, toread, 0); |
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237 | #else |
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238 | do |
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239 | { |
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240 | stat = read (fd, sl->buf + sl->len, toread); |
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241 | } |
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242 | while ((stat < 0) && (errno == EINTR)); |
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243 | #endif |
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244 | if (stat < 0) |
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245 | { |
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246 | |
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247 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change error handling for win32 */ |
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248 | if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK) |
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249 | { |
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250 | if (WSAGetLastError () == WSAECONNRESET) |
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251 | LOG (llevDebug, "Connection closed by client\n"); |
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252 | else |
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253 | { |
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254 | LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ()); |
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255 | } |
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256 | return -1; /* kick this user! */ |
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257 | } |
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258 | #else |
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259 | if (errno != EAGAIN && errno != EWOULDBLOCK) |
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260 | { |
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261 | LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); |
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262 | } |
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263 | #endif |
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264 | return 0; /*Error */ |
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265 | } |
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266 | if (stat == 0) |
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267 | return -1; |
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268 | sl->len += stat; |
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269 | #ifdef CS_LOGSTATS |
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270 | cst_tot.ibytes += stat; |
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271 | cst_lst.ibytes += stat; |
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272 | #endif |
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273 | toread -= stat; |
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274 | if (toread == 0) |
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275 | return 1; |
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276 | if (toread < 0) |
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277 | { |
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278 | LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n"); |
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279 | return 1; |
170 | return 0; |
280 | } |
171 | } |
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172 | |
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173 | inbuf_len += amount; |
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174 | |
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175 | cst_tot.ibytes += amount; |
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176 | cst_lst.ibytes += amount; |
281 | } |
177 | } |
282 | while (toread > 0); |
178 | } |
283 | return 0; |
179 | |
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180 | void |
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181 | NewSocket::skip_packet (int len) |
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182 | { |
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183 | inbuf_len -= len; |
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184 | memmove (inbuf, inbuf + len, inbuf_len); |
284 | } |
185 | } |
285 | |
186 | |
286 | /******************************************************************************* |
187 | /******************************************************************************* |
287 | * |
188 | * |
288 | * Start of write related routines. |
189 | * Start of write related routines. |
… | |
… | |
295 | * ns is the socket we are adding the data to, buf is the start of the |
196 | * ns is the socket we are adding the data to, buf is the start of the |
296 | * data, and len is the number of bytes to add. |
197 | * data, and len is the number of bytes to add. |
297 | */ |
198 | */ |
298 | |
199 | |
299 | static void |
200 | static void |
300 | add_to_buffer (NewSocket * ns, char *buf, int len) |
201 | add_to_buffer (NewSocket *ns, char *buf, int len) |
301 | { |
202 | { |
302 | int avail, end; |
203 | int avail, end; |
303 | |
204 | |
304 | if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE) |
205 | if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE) |
305 | { |
206 | { |
… | |
… | |
314 | |
215 | |
315 | end = ns->outputbuffer.start + ns->outputbuffer.len; |
216 | end = ns->outputbuffer.start + ns->outputbuffer.len; |
316 | /* The buffer is already in a wrapped state, so adjust end */ |
217 | /* The buffer is already in a wrapped state, so adjust end */ |
317 | if (end >= SOCKETBUFSIZE) |
218 | if (end >= SOCKETBUFSIZE) |
318 | end -= SOCKETBUFSIZE; |
219 | end -= SOCKETBUFSIZE; |
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220 | |
319 | avail = SOCKETBUFSIZE - end; |
221 | avail = SOCKETBUFSIZE - end; |
320 | |
222 | |
321 | /* We can all fit it behind the current data without wrapping */ |
223 | /* We can all fit it behind the current data without wrapping */ |
322 | if (avail >= len) |
224 | if (avail >= len) |
323 | { |
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324 | memcpy (ns->outputbuffer.data + end, buf, len); |
225 | memcpy (ns->outputbuffer.data + end, buf, len); |
325 | } |
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326 | else |
226 | else |
327 | { |
227 | { |
328 | memcpy (ns->outputbuffer.data + end, buf, avail); |
228 | memcpy (ns->outputbuffer.data + end, buf, avail); |
329 | memcpy (ns->outputbuffer.data, buf + avail, len - avail); |
229 | memcpy (ns->outputbuffer.data, buf + avail, len - avail); |
330 | } |
230 | } |
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231 | |
331 | ns->outputbuffer.len += len; |
232 | ns->outputbuffer.len += len; |
332 | #if 0 |
233 | #if 0 |
333 | LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start); |
234 | LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start); |
334 | #endif |
235 | #endif |
335 | } |
236 | } |
… | |
… | |
355 | { |
256 | { |
356 | max = SOCKETBUFSIZE - ns->outputbuffer.start; |
257 | max = SOCKETBUFSIZE - ns->outputbuffer.start; |
357 | if (ns->outputbuffer.len < max) |
258 | if (ns->outputbuffer.len < max) |
358 | max = ns->outputbuffer.len; |
259 | max = ns->outputbuffer.len; |
359 | |
260 | |
360 | #ifdef WIN32 /* ***win32 write_socket_buffer: change write() to send() */ |
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361 | amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0); |
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362 | #else |
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363 | do |
261 | do |
364 | { |
262 | { |
365 | amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
263 | amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
366 | } |
264 | } |
367 | while ((amt < 0) && (errno == EINTR)); |
265 | while ((amt < 0) && (errno == EINTR)); |
368 | #endif |
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369 | |
266 | |
370 | if (amt < 0) |
267 | if (amt < 0) |
371 | { /* We got an error */ |
268 | { /* We got an error */ |
372 | |
269 | |
373 | #ifdef WIN32 /* ***win32 write_socket_buffer: change error handling */ |
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374 | if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK) |
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375 | { |
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376 | LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ()); |
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377 | #else |
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378 | if (errno != EWOULDBLOCK) |
270 | if (errno != EWOULDBLOCK) |
379 | { |
271 | { |
380 | LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno)); |
272 | LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno)); |
381 | #endif |
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382 | ns->status = Ns_Dead; |
273 | ns->status = Ns_Dead; |
383 | return; |
274 | return; |
384 | } |
275 | } |
385 | else |
276 | else |
386 | { /* EWOULDBLOCK */ |
277 | { /* EWOULDBLOCK */ |
… | |
… | |
430 | #endif |
321 | #endif |
431 | /* If we manage to write more than we wanted, take it as a bonus */ |
322 | /* If we manage to write more than we wanted, take it as a bonus */ |
432 | while (len > 0) |
323 | while (len > 0) |
433 | { |
324 | { |
434 | |
325 | |
435 | #ifdef WIN32 /* ***win32 Write_To_Socket: change write() to send() */ |
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436 | amt = send (ns->fd, pos, len, 0); |
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437 | #else |
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438 | do |
326 | do |
439 | { |
327 | { |
440 | amt = write (ns->fd, pos, len); |
328 | amt = write (ns->fd, pos, len); |
441 | } |
329 | } |
442 | while ((amt < 0) && (errno == EINTR)); |
330 | while ((amt < 0) && (errno == EINTR)); |
443 | #endif |
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444 | |
331 | |
445 | if (amt < 0) |
332 | if (amt < 0) |
446 | { /* We got an error */ |
333 | { /* We got an error */ |
447 | #ifdef WIN32 /* ***win32 Write_To_Socket: change error handling */ |
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448 | if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK) |
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449 | { |
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450 | LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ()); |
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451 | #else |
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452 | if (errno != EWOULDBLOCK) |
334 | if (errno != EWOULDBLOCK) |
453 | { |
335 | { |
454 | LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
336 | LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
455 | errno, strerror (errno)); |
337 | errno, strerror (errno)); |
456 | #endif |
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457 | ns->status = Ns_Dead; |
338 | ns->status = Ns_Dead; |
458 | return; |
339 | return; |
459 | } |
340 | } |
460 | else |
341 | else |
461 | { /* EWOULDBLOCK */ |
342 | { /* EWOULDBLOCK */ |
… | |
… | |
479 | cst_lst.obytes += amt; |
360 | cst_lst.obytes += amt; |
480 | #endif |
361 | #endif |
481 | } |
362 | } |
482 | } |
363 | } |
483 | |
364 | |
484 | |
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485 | /** |
365 | /** |
486 | * Takes a string of data, and writes it out to the socket. A very handy |
366 | * Takes a string of data, and writes it out to the socket. A very handy |
487 | * shortcut function. |
367 | * shortcut function. |
488 | */ |
368 | */ |
489 | void |
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490 | cs_write_string (NewSocket * ns, const char *buf, int len) |
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491 | { |
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492 | SockList sl; |
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493 | |
369 | |
494 | sl.len = len; |
370 | void |
495 | sl.buf = (unsigned char *) buf; |
371 | NewSocket::send_packet (packet &sl) |
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372 | { |
496 | Send_With_Handling (ns, &sl); |
373 | Send_With_Handling (this, &sl); |
497 | } |
374 | } |
498 | |
375 | |
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376 | void |
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377 | NewSocket::send_packet (const char *buf, int len) |
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378 | { |
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379 | packet sl; |
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380 | |
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381 | sl << data (buf, len); |
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382 | send_packet (sl); |
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383 | } |
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384 | |
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385 | void |
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386 | NewSocket::send_packet (const char *buf) |
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387 | { |
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388 | send_packet (buf, strlen (buf)); |
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389 | } |
499 | |
390 | |
500 | /** |
391 | /** |
501 | * Calls Write_To_Socket to send data to the client. |
392 | * Calls Write_To_Socket to send data to the client. |
502 | * |
393 | * |
503 | * The only difference in this function is that we take a SockList |
394 | * The only difference in this function is that we take a packet |
504 | *, and we prepend the length information. |
395 | *, and we prepend the length information. |
505 | */ |
396 | */ |
506 | void |
397 | void |
507 | Send_With_Handling (NewSocket * ns, SockList * msg) |
398 | Send_With_Handling (NewSocket *ns, packet *msg) |
508 | { |
399 | { |
509 | unsigned char sbuf[4]; |
400 | unsigned char sbuf[4]; |
510 | |
401 | |
511 | if (ns->status == Ns_Dead || !msg) |
402 | if (ns->status == Ns_Dead || !msg) |
512 | return; |
403 | return; |
… | |
… | |
523 | sbuf[1] = ((uint32) (msg->len)) & 0xFF; |
414 | sbuf[1] = ((uint32) (msg->len)) & 0xFF; |
524 | if (ns->status != Ns_Old) |
415 | if (ns->status != Ns_Old) |
525 | Write_To_Socket (ns, (char *) sbuf, 2); |
416 | Write_To_Socket (ns, (char *) sbuf, 2); |
526 | Write_To_Socket (ns, (char *) msg->buf, msg->len); |
417 | Write_To_Socket (ns, (char *) msg->buf, msg->len); |
527 | } |
418 | } |
528 | |
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529 | /** |
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530 | * Takes a string of data, and writes it out to the socket. A very handy |
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531 | * shortcut function. |
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532 | */ |
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533 | void |
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534 | Write_String_To_Socket (NewSocket * ns, char *buf, int len) |
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535 | { |
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536 | SockList sl; |
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537 | |
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538 | sl.len = len; |
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539 | sl.buf = (unsigned char *) buf; |
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540 | Send_With_Handling (ns, &sl); |
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541 | } |
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542 | |
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543 | |
419 | |
544 | /****************************************************************************** |
420 | /****************************************************************************** |
545 | * |
421 | * |
546 | * statistics logging functions. |
422 | * statistics logging functions. |
547 | * |
423 | * |
… | |
… | |
574 | cst_lst.obytes = 0; |
450 | cst_lst.obytes = 0; |
575 | cst_lst.max_conn = socket_info.nconns; |
451 | cst_lst.max_conn = socket_info.nconns; |
576 | cst_lst.time_start = now; |
452 | cst_lst.time_start = now; |
577 | } |
453 | } |
578 | #endif |
454 | #endif |
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455 | |