1 | /* $Id: tcp.cpp 27787 2010-03-29 12:39:25Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - TCP/IP.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2010 Sun Microsystems, Inc.
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | *
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26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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28 | * additional information or have any questions.
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29 | */
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30 |
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31 |
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32 | /*******************************************************************************
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33 | * Header Files *
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34 | *******************************************************************************/
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35 | #ifdef RT_OS_WINDOWS
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36 | # include <winsock2.h>
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37 | #else
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38 | # include <sys/types.h>
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39 | # include <sys/socket.h>
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40 | # include <errno.h>
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41 | # include <netinet/in.h>
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42 | # include <netinet/tcp.h>
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43 | # include <arpa/inet.h>
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44 | # include <netdb.h>
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45 | #endif
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46 | #include <limits.h>
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47 |
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48 | #include "internal/iprt.h"
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49 | #include <iprt/tcp.h>
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50 |
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51 | #include <iprt/asm.h>
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52 | #include <iprt/assert.h>
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53 | #include <iprt/err.h>
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54 | #include <iprt/mempool.h>
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55 | #include <iprt/mem.h>
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56 | #include <iprt/string.h>
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57 | #include <iprt/socket.h>
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58 | #include <iprt/thread.h>
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59 | #include <iprt/time.h>
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60 |
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61 | #include "internal/magics.h"
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62 | #include "internal/socket.h"
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63 |
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64 |
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65 | /*******************************************************************************
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66 | * Defined Constants And Macros *
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67 | *******************************************************************************/
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68 | /* non-standard linux stuff (it seems). */
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69 | #ifndef MSG_NOSIGNAL
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70 | # define MSG_NOSIGNAL 0
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71 | #endif
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72 | #ifndef SHUT_RDWR
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73 | # ifdef SD_BOTH
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74 | # define SHUT_RDWR SD_BOTH
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75 | # else
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76 | # define SHUT_RDWR 2
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77 | # endif
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78 | #endif
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79 | #ifndef SHUT_WR
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80 | # ifdef SD_SEND
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81 | # define SHUT_WR SD_SEND
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82 | # else
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83 | # define SHUT_WR 1
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84 | # endif
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85 | #endif
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86 |
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87 | /* fixup backlevel OSes. */
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88 | #if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
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89 | # define socklen_t int
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90 | #endif
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91 |
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92 | /** How many pending connection. */
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93 | #define RTTCP_SERVER_BACKLOG 10
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94 |
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95 |
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96 | /*******************************************************************************
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97 | * Structures and Typedefs *
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98 | *******************************************************************************/
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99 | /**
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100 | * TCP Server state.
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101 | */
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102 | typedef enum RTTCPSERVERSTATE
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103 | {
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104 | /** Invalid. */
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105 | RTTCPSERVERSTATE_INVALID = 0,
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106 | /** Created. */
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107 | RTTCPSERVERSTATE_CREATED,
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108 | /** Listener thread is starting up. */
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109 | RTTCPSERVERSTATE_STARTING,
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110 | /** Accepting client connections. */
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111 | RTTCPSERVERSTATE_ACCEPTING,
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112 | /** Serving a client. */
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113 | RTTCPSERVERSTATE_SERVING,
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114 | /** Listener terminating. */
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115 | RTTCPSERVERSTATE_STOPPING,
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116 | /** Listener terminated. */
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117 | RTTCPSERVERSTATE_STOPPED,
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118 | /** Listener cleans up. */
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119 | RTTCPSERVERSTATE_DESTROYING
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120 | } RTTCPSERVERSTATE;
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121 |
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122 | /*
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123 | * Internal representation of the TCP Server handle.
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124 | */
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125 | typedef struct RTTCPSERVER
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126 | {
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127 | /** The magic value (RTTCPSERVER_MAGIC). */
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128 | uint32_t volatile u32Magic;
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129 | /** The server state. */
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130 | RTTCPSERVERSTATE volatile enmState;
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131 | /** The server thread. */
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132 | RTTHREAD Thread;
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133 | /** The server socket. */
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134 | RTSOCKET volatile hServerSocket;
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135 | /** The socket to the client currently being serviced.
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136 | * This is NIL_RTSOCKET when no client is serviced. */
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137 | RTSOCKET volatile hClientSocket;
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138 | /** The connection function. */
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139 | PFNRTTCPSERVE pfnServe;
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140 | /** Argument to pfnServer. */
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141 | void *pvUser;
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142 | } RTTCPSERVER;
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143 |
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144 |
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145 | /*******************************************************************************
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146 | * Internal Functions *
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147 | *******************************************************************************/
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148 | static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer);
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149 | static int rtTcpServerListen(PRTTCPSERVER pServer);
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150 | static int rtTcpServerListenCleanup(PRTTCPSERVER pServer);
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151 | static int rtTcpServerDestroySocket(RTSOCKET volatile *pSockClient, const char *pszMsg);
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152 | static int rtTcpClose(RTSOCKET Sock, const char *pszMsg, bool fTryGracefulShutdown);
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153 |
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154 |
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155 | /**
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156 | * Atomicly updates a socket variable.
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157 | * @returns The old handle value.
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158 | * @param phSock The socket handle variable to update.
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159 | * @param hSock The new socket handle value.
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160 | */
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161 | DECLINLINE(RTSOCKET) rtTcpAtomicXchgSock(RTSOCKET volatile *phSock, const RTSOCKET hNew)
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162 | {
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163 | RTSOCKET hRet;
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164 | ASMAtomicXchgHandle(phSock, hNew, &hRet);
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165 | return hRet;
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166 | }
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167 |
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168 |
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169 | /**
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170 | * Tries to change the TCP server state.
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171 | */
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172 | DECLINLINE(bool) rtTcpServerTrySetState(PRTTCPSERVER pServer, RTTCPSERVERSTATE enmStateNew, RTTCPSERVERSTATE enmStateOld)
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173 | {
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174 | bool fRc;
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175 | ASMAtomicCmpXchgSize(&pServer->enmState, enmStateNew, enmStateOld, fRc);
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176 | return fRc;
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177 | }
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178 |
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179 | /**
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180 | * Changes the TCP server state.
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181 | */
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182 | DECLINLINE(void) rtTcpServerSetState(PRTTCPSERVER pServer, RTTCPSERVERSTATE enmStateNew, RTTCPSERVERSTATE enmStateOld)
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183 | {
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184 | bool fRc;
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185 | ASMAtomicCmpXchgSize(&pServer->enmState, enmStateNew, enmStateOld, fRc);
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186 | Assert(fRc); NOREF(fRc);
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187 | }
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188 |
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189 |
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190 | /**
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191 | * Closes the a socket (client or server).
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192 | *
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193 | * @returns IPRT status code.
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194 | */
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195 | static int rtTcpServerDestroySocket(RTSOCKET volatile *pSock, const char *pszMsg, bool fTryGracefulShutdown)
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196 | {
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197 | RTSOCKET hSocket = rtTcpAtomicXchgSock(pSock, NIL_RTSOCKET);
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198 | if (hSocket != NIL_RTSOCKET)
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199 | {
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200 | if (!fTryGracefulShutdown)
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201 | RTSocketShutdown(hSocket, true /*fRead*/, true /*fWrite*/);
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202 | return rtTcpClose(hSocket, pszMsg, fTryGracefulShutdown);
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203 | }
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204 | return VINF_TCP_SERVER_NO_CLIENT;
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205 | }
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206 |
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207 |
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208 | /**
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209 | * Create single connection at a time TCP Server in a separate thread.
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210 | *
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211 | * The thread will loop accepting connections and call pfnServe for
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212 | * each of the incoming connections in turn. The pfnServe function can
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213 | * return VERR_TCP_SERVER_STOP too terminate this loop. RTTcpServerDestroy()
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214 | * should be used to terminate the server.
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215 | *
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216 | * @returns iprt status code.
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217 | * @param pszAddress The address for creating a listening socket.
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218 | * If NULL or empty string the server is bound to all interfaces.
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219 | * @param uPort The port for creating a listening socket.
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220 | * @param enmType The thread type.
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221 | * @param pszThrdName The name of the worker thread.
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222 | * @param pfnServe The function which will serve a new client connection.
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223 | * @param pvUser User argument passed to pfnServe.
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224 | * @param ppServer Where to store the serverhandle.
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225 | */
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226 | RTR3DECL(int) RTTcpServerCreate(const char *pszAddress, unsigned uPort, RTTHREADTYPE enmType, const char *pszThrdName,
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227 | PFNRTTCPSERVE pfnServe, void *pvUser, PPRTTCPSERVER ppServer)
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228 | {
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229 | /*
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230 | * Validate input.
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231 | */
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232 | AssertReturn(uPort > 0, VERR_INVALID_PARAMETER);
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233 | AssertPtrReturn(pfnServe, VERR_INVALID_POINTER);
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234 | AssertPtrReturn(pszThrdName, VERR_INVALID_POINTER);
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235 | AssertPtrReturn(ppServer, VERR_INVALID_POINTER);
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236 |
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237 | /*
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238 | * Create the server.
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239 | */
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240 | PRTTCPSERVER pServer;
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241 | int rc = RTTcpServerCreateEx(pszAddress, uPort, &pServer);
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242 | if (RT_SUCCESS(rc))
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243 | {
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244 | /*
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245 | * Create the listener thread.
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246 | */
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247 | RTMemPoolRetain(pServer);
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248 | pServer->enmState = RTTCPSERVERSTATE_STARTING;
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249 | pServer->pvUser = pvUser;
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250 | pServer->pfnServe = pfnServe;
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251 | rc = RTThreadCreate(&pServer->Thread, rtTcpServerThread, pServer, 0, enmType, /*RTTHREADFLAGS_WAITABLE*/0, pszThrdName);
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252 | if (RT_SUCCESS(rc))
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253 | {
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254 | /* done */
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255 | if (ppServer)
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256 | *ppServer = pServer;
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257 | else
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258 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
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259 | return rc;
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260 | }
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261 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
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262 |
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263 | /*
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264 | * Destroy the server.
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265 | */
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266 | rtTcpServerSetState(pServer, RTTCPSERVERSTATE_CREATED, RTTCPSERVERSTATE_STARTING);
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267 | RTTcpServerDestroy(pServer);
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268 | }
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269 |
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270 | return rc;
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271 | }
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272 |
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273 |
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274 | /**
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275 | * Server thread, loops accepting connections until it's terminated.
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276 | *
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277 | * @returns iprt status code. (ignored).
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278 | * @param ThreadSelf Thread handle.
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279 | * @param pvServer Server handle.
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280 | */
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281 | static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer)
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282 | {
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283 | PRTTCPSERVER pServer = (PRTTCPSERVER)pvServer;
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284 | int rc;
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285 | if (rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_STARTING))
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286 | rc = rtTcpServerListen(pServer);
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287 | else
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288 | rc = rtTcpServerListenCleanup(pServer);
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289 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
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290 | NOREF(ThreadSelf);
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291 | return VINF_SUCCESS;
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292 | }
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293 |
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294 |
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295 | /**
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296 | * Create single connection at a time TCP Server.
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297 | * The caller must call RTTcpServerListen() to actually start the server.
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298 | *
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299 | * @returns iprt status code.
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300 | * @param pszAddress The address for creating a listening socket.
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301 | * If NULL the server is bound to all interfaces.
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302 | * @param uPort The port for creating a listening socket.
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303 | * @param ppServer Where to store the serverhandle.
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304 | */
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305 | RTR3DECL(int) RTTcpServerCreateEx(const char *pszAddress, uint32_t uPort, PPRTTCPSERVER ppServer)
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306 | {
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307 | int rc;
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308 |
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309 | /*
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310 | * Validate input.
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311 | */
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312 | AssertReturn(uPort > 0, VERR_INVALID_PARAMETER);
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313 | AssertPtrReturn(ppServer, VERR_INVALID_PARAMETER);
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314 |
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315 | #ifdef RT_OS_WINDOWS
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316 | /*
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317 | * Initialize WinSock and check version.
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318 | */
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319 | WORD wVersionRequested = MAKEWORD(1, 1);
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320 | WSADATA wsaData;
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321 | rc = WSAStartup(wVersionRequested, &wsaData);
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322 | if (wsaData.wVersion != wVersionRequested)
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323 | {
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324 | AssertMsgFailed(("Wrong winsock version\n"));
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325 | return VERR_NOT_SUPPORTED;
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326 | }
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327 | #endif
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328 |
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329 | /*
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330 | * Get host listening address.
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331 | */
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332 | struct hostent *pHostEnt = NULL;
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333 | if (pszAddress != NULL && *pszAddress)
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334 | {
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335 | pHostEnt = gethostbyname(pszAddress);
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336 | if (!pHostEnt)
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337 | {
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338 | struct in_addr InAddr;
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339 | InAddr.s_addr = inet_addr(pszAddress);
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340 | pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
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341 | if (!pHostEnt)
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342 | {
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343 | rc = rtSocketResolverError();
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344 | AssertMsgFailed(("Could not get host address rc=%Rrc\n", rc));
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345 | return rc;
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346 | }
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347 | }
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348 | }
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349 |
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350 | /*
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351 | * Setting up socket.
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352 | */
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353 | RTSOCKET WaitSock;
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354 | rc = rtSocketCreate(&WaitSock, AF_INET, SOCK_STREAM, IPPROTO_TCP);
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355 | if (RT_SUCCESS(rc))
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356 | {
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357 | RTSocketSetInheritance(WaitSock, false /*fInheritable*/);
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358 |
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359 | /*
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360 | * Set socket options.
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361 | */
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362 | int fFlag = 1;
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363 | if (!rtSocketSetOpt(WaitSock, SOL_SOCKET, SO_REUSEADDR, &fFlag, sizeof(fFlag)))
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364 | {
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365 | /*
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366 | * Set socket family, address and port.
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367 | */
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368 | struct sockaddr_in LocalAddr;
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369 | RT_ZERO(LocalAddr);
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370 | LocalAddr.sin_family = AF_INET;
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371 | LocalAddr.sin_port = htons(uPort);
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372 | /* if address not specified, use INADDR_ANY. */
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373 | if (!pHostEnt)
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374 | LocalAddr.sin_addr.s_addr = INADDR_ANY;
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375 | else
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376 | LocalAddr.sin_addr = *((struct in_addr *)pHostEnt->h_addr);
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377 |
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378 | /*
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379 | * Bind a name to a socket and set it listening for connections.
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380 | */
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381 | rc = rtSocketBind(WaitSock, (struct sockaddr *)&LocalAddr, sizeof(LocalAddr));
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382 | if (RT_SUCCESS(rc))
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383 | rc = rtSocketListen(WaitSock, RTTCP_SERVER_BACKLOG);
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384 | if (RT_SUCCESS(rc))
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385 | {
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386 | /*
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387 | * Create the server handle.
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388 | */
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389 | PRTTCPSERVER pServer = (PRTTCPSERVER)RTMemPoolAlloc(RTMEMPOOL_DEFAULT, sizeof(*pServer));
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390 | if (pServer)
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391 | {
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392 | pServer->u32Magic = RTTCPSERVER_MAGIC;
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393 | pServer->enmState = RTTCPSERVERSTATE_CREATED;
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394 | pServer->Thread = NIL_RTTHREAD;
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395 | pServer->hServerSocket = WaitSock;
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396 | pServer->hClientSocket = NIL_RTSOCKET;
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397 | pServer->pfnServe = NULL;
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398 | pServer->pvUser = NULL;
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399 | *ppServer = pServer;
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400 | return VINF_SUCCESS;
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401 | }
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402 |
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403 | /* bail out */
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404 | rc = VERR_NO_MEMORY;
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405 | }
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406 | }
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407 | else
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408 | AssertMsgFailed(("rtSocketSetOpt: %Rrc\n", rc));
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409 | rtTcpClose(WaitSock, "RTServerCreateEx", false /*fTryGracefulShutdown*/);
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410 | }
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411 |
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412 | return rc;
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413 | }
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414 |
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415 |
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416 | /**
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417 | * Listen for incoming connections.
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418 | *
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419 | * The function will loop accepting connections and call pfnServe for
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420 | * each of the incoming connections in turn. The pfnServe function can
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421 | * return VERR_TCP_SERVER_STOP too terminate this loop. A stopped server
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422 | * can only be destroyed.
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423 | *
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424 | * @returns IPRT status code.
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425 | * @retval VERR_TCP_SERVER_STOP if stopped by pfnServe.
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426 | * @retval VERR_TCP_SERVER_SHUTDOWN if shut down by RTTcpServerShutdown.
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427 | *
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428 | * @param pServer The server handle as returned from RTTcpServerCreateEx().
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429 | * @param pfnServe The function which will serve a new client connection.
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430 | * @param pvUser User argument passed to pfnServe.
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431 | */
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432 | RTR3DECL(int) RTTcpServerListen(PRTTCPSERVER pServer, PFNRTTCPSERVE pfnServe, void *pvUser)
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433 | {
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434 | /*
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435 | * Validate input and retain the instance.
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436 | */
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437 | AssertPtrReturn(pfnServe, VERR_INVALID_POINTER);
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438 | AssertPtrReturn(pServer, VERR_INVALID_HANDLE);
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439 | AssertReturn(pServer->u32Magic == RTTCPSERVER_MAGIC, VERR_INVALID_HANDLE);
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440 | AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE);
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441 |
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442 | int rc = VERR_INVALID_STATE;
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443 | if (rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_CREATED))
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444 | {
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445 | Assert(!pServer->pfnServe);
|
---|
446 | Assert(!pServer->pvUser);
|
---|
447 | Assert(pServer->Thread == NIL_RTTHREAD);
|
---|
448 | Assert(pServer->hClientSocket == NIL_RTSOCKET);
|
---|
449 |
|
---|
450 | pServer->pfnServe = pfnServe;
|
---|
451 | pServer->pvUser = pvUser;
|
---|
452 | pServer->Thread = RTThreadSelf();
|
---|
453 | Assert(pServer->Thread != NIL_RTTHREAD);
|
---|
454 | rc = rtTcpServerListen(pServer);
|
---|
455 | }
|
---|
456 | else
|
---|
457 | {
|
---|
458 | AssertMsgFailed(("enmState=%d\n", pServer->enmState));
|
---|
459 | rc = VERR_INVALID_STATE;
|
---|
460 | }
|
---|
461 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
|
---|
462 | return rc;
|
---|
463 | }
|
---|
464 |
|
---|
465 |
|
---|
466 | /**
|
---|
467 | * Internal worker common for RTTcpServerListen and the thread created by
|
---|
468 | * RTTcpServerCreate().
|
---|
469 | *
|
---|
470 | * The caller makes sure it has its own memory reference and releases it upon
|
---|
471 | * return.
|
---|
472 | */
|
---|
473 | static int rtTcpServerListen(PRTTCPSERVER pServer)
|
---|
474 | {
|
---|
475 | /*
|
---|
476 | * Accept connection loop.
|
---|
477 | */
|
---|
478 | for (;;)
|
---|
479 | {
|
---|
480 | /*
|
---|
481 | * Change state, getting an extra reference to the socket so we can
|
---|
482 | * allow others to close it while we're stuck in rtSocketAccept.
|
---|
483 | */
|
---|
484 | RTTCPSERVERSTATE enmState = pServer->enmState;
|
---|
485 | RTSOCKET hServerSocket;
|
---|
486 | ASMAtomicXchgHandle(&pServer->hServerSocket, NIL_RTSOCKET, &hServerSocket);
|
---|
487 | if (hServerSocket != NIL_RTSOCKET)
|
---|
488 | {
|
---|
489 | RTSocketRetain(hServerSocket);
|
---|
490 | ASMAtomicWriteHandle(&pServer->hServerSocket, hServerSocket);
|
---|
491 | }
|
---|
492 | if ( enmState != RTTCPSERVERSTATE_ACCEPTING
|
---|
493 | && enmState != RTTCPSERVERSTATE_SERVING)
|
---|
494 | {
|
---|
495 | RTSocketRelease(hServerSocket);
|
---|
496 | return rtTcpServerListenCleanup(pServer);
|
---|
497 | }
|
---|
498 | if (!rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_ACCEPTING, enmState))
|
---|
499 | {
|
---|
500 | RTSocketRelease(hServerSocket);
|
---|
501 | continue;
|
---|
502 | }
|
---|
503 |
|
---|
504 | /*
|
---|
505 | * Accept connection.
|
---|
506 | */
|
---|
507 | struct sockaddr_in RemoteAddr;
|
---|
508 | size_t cbRemoteAddr = sizeof(RemoteAddr);
|
---|
509 | RTSOCKET hClientSocket;
|
---|
510 | RT_ZERO(RemoteAddr);
|
---|
511 | int rc = rtSocketAccept(hServerSocket, &hClientSocket, (struct sockaddr *)&RemoteAddr, &cbRemoteAddr);
|
---|
512 | RTSocketRelease(hServerSocket);
|
---|
513 | if (RT_FAILURE(rc))
|
---|
514 | {
|
---|
515 | /* These are typical for what can happen during destruction. */
|
---|
516 | if ( rc == VERR_INVALID_HANDLE
|
---|
517 | || rc == VERR_INVALID_PARAMETER
|
---|
518 | || rc == VERR_NET_NOT_SOCKET)
|
---|
519 | return rtTcpServerListenCleanup(pServer);
|
---|
520 | continue;
|
---|
521 | }
|
---|
522 | RTSocketSetInheritance(hClientSocket, false /*fInheritable*/);
|
---|
523 |
|
---|
524 | /*
|
---|
525 | * Run a pfnServe callback.
|
---|
526 | */
|
---|
527 | if (!rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_SERVING, RTTCPSERVERSTATE_ACCEPTING))
|
---|
528 | {
|
---|
529 | rtTcpClose(hClientSocket, "rtTcpServerListen", true /*fTryGracefulShutdown*/);
|
---|
530 | return rtTcpServerListenCleanup(pServer);
|
---|
531 | }
|
---|
532 | RTSocketRetain(hClientSocket);
|
---|
533 | rtTcpAtomicXchgSock(&pServer->hClientSocket, hClientSocket);
|
---|
534 | rc = pServer->pfnServe(hClientSocket, pServer->pvUser);
|
---|
535 | rtTcpServerDestroySocket(&pServer->hClientSocket, "Listener: client (secondary)", true /*fTryGracefulShutdown*/);
|
---|
536 | RTSocketRelease(hClientSocket);
|
---|
537 |
|
---|
538 | /*
|
---|
539 | * Stop the server?
|
---|
540 | */
|
---|
541 | if (rc == VERR_TCP_SERVER_STOP)
|
---|
542 | {
|
---|
543 | if (rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_STOPPING, RTTCPSERVERSTATE_SERVING))
|
---|
544 | {
|
---|
545 | /*
|
---|
546 | * Reset the server socket and change the state to stopped. After that state change
|
---|
547 | * we cannot safely access the handle so we'll have to return here.
|
---|
548 | */
|
---|
549 | hServerSocket = rtTcpAtomicXchgSock(&pServer->hServerSocket, NIL_RTSOCKET);
|
---|
550 | rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPED, RTTCPSERVERSTATE_STOPPING);
|
---|
551 | rtTcpClose(hServerSocket, "Listener: server stopped", false /*fTryGracefulShutdown*/);
|
---|
552 | }
|
---|
553 | else
|
---|
554 | rtTcpServerListenCleanup(pServer); /* ignore rc */
|
---|
555 | return rc;
|
---|
556 | }
|
---|
557 | }
|
---|
558 | }
|
---|
559 |
|
---|
560 |
|
---|
561 | /**
|
---|
562 | * Clean up after listener.
|
---|
563 | */
|
---|
564 | static int rtTcpServerListenCleanup(PRTTCPSERVER pServer)
|
---|
565 | {
|
---|
566 | /*
|
---|
567 | * Close the server socket, the client one shouldn't be set.
|
---|
568 | */
|
---|
569 | rtTcpServerDestroySocket(&pServer->hServerSocket, "ListenCleanup", false /*fTryGracefulShutdown*/);
|
---|
570 | Assert(pServer->hClientSocket == NIL_RTSOCKET);
|
---|
571 |
|
---|
572 | /*
|
---|
573 | * Figure the return code and make sure the state is OK.
|
---|
574 | */
|
---|
575 | RTTCPSERVERSTATE enmState = pServer->enmState;
|
---|
576 | switch (enmState)
|
---|
577 | {
|
---|
578 | case RTTCPSERVERSTATE_STOPPING:
|
---|
579 | case RTTCPSERVERSTATE_STOPPED:
|
---|
580 | return VERR_TCP_SERVER_SHUTDOWN;
|
---|
581 |
|
---|
582 | case RTTCPSERVERSTATE_ACCEPTING:
|
---|
583 | rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_STOPPED, enmState);
|
---|
584 | return VERR_TCP_SERVER_DESTROYED;
|
---|
585 |
|
---|
586 | case RTTCPSERVERSTATE_DESTROYING:
|
---|
587 | return VERR_TCP_SERVER_DESTROYED;
|
---|
588 |
|
---|
589 | case RTTCPSERVERSTATE_STARTING:
|
---|
590 | case RTTCPSERVERSTATE_SERVING:
|
---|
591 | default:
|
---|
592 | AssertMsgFailedReturn(("pServer=%p enmState=%d\n", pServer, enmState), VERR_INTERNAL_ERROR_4);
|
---|
593 | }
|
---|
594 | }
|
---|
595 |
|
---|
596 |
|
---|
597 | /**
|
---|
598 | * Listen and accept one incomming connection.
|
---|
599 | *
|
---|
600 | * This is an alternative to RTTcpServerListen for the use the callbacks are not
|
---|
601 | * possible.
|
---|
602 | *
|
---|
603 | * @returns IPRT status code.
|
---|
604 | * @retval VERR_TCP_SERVER_SHUTDOWN if shut down by RTTcpServerShutdown.
|
---|
605 | * @retval VERR_INTERRUPTED if the listening was interrupted.
|
---|
606 | *
|
---|
607 | * @param pServer The server handle as returned from RTTcpServerCreateEx().
|
---|
608 | * @param phClientSocket Where to return the socket handle to the client
|
---|
609 | * connection (on success only). This must be closed
|
---|
610 | * by calling RTTcpServerDisconnectClient2().
|
---|
611 | */
|
---|
612 | RTR3DECL(int) RTTcpServerListen2(PRTTCPSERVER pServer, PRTSOCKET phClientSocket)
|
---|
613 | {
|
---|
614 | /*
|
---|
615 | * Validate input and retain the instance.
|
---|
616 | */
|
---|
617 | AssertPtrReturn(phClientSocket, VERR_INVALID_HANDLE);
|
---|
618 | *phClientSocket = NIL_RTSOCKET;
|
---|
619 | AssertReturn(pServer->u32Magic == RTTCPSERVER_MAGIC, VERR_INVALID_HANDLE);
|
---|
620 | AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE);
|
---|
621 |
|
---|
622 | int rc = VERR_INVALID_STATE;
|
---|
623 | for (;;)
|
---|
624 | {
|
---|
625 | /*
|
---|
626 | * Change state, getting an extra reference to the socket so we can
|
---|
627 | * allow others to close it while we're stuck in rtSocketAccept.
|
---|
628 | */
|
---|
629 | RTTCPSERVERSTATE enmState = pServer->enmState;
|
---|
630 | RTSOCKET hServerSocket;
|
---|
631 | ASMAtomicXchgHandle(&pServer->hServerSocket, NIL_RTSOCKET, &hServerSocket);
|
---|
632 | if (hServerSocket != NIL_RTSOCKET)
|
---|
633 | {
|
---|
634 | RTSocketRetain(hServerSocket);
|
---|
635 | ASMAtomicWriteHandle(&pServer->hServerSocket, hServerSocket);
|
---|
636 | }
|
---|
637 | if ( enmState != RTTCPSERVERSTATE_SERVING
|
---|
638 | && enmState != RTTCPSERVERSTATE_CREATED)
|
---|
639 | {
|
---|
640 | RTSocketRelease(hServerSocket);
|
---|
641 | return rtTcpServerListenCleanup(pServer);
|
---|
642 | }
|
---|
643 | if (!rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_ACCEPTING, enmState))
|
---|
644 | {
|
---|
645 | RTSocketRelease(hServerSocket);
|
---|
646 | continue;
|
---|
647 | }
|
---|
648 | Assert(!pServer->pfnServe);
|
---|
649 | Assert(!pServer->pvUser);
|
---|
650 | Assert(pServer->Thread == NIL_RTTHREAD);
|
---|
651 | Assert(pServer->hClientSocket == NIL_RTSOCKET);
|
---|
652 |
|
---|
653 | /*
|
---|
654 | * Accept connection.
|
---|
655 | */
|
---|
656 | struct sockaddr_in RemoteAddr;
|
---|
657 | size_t cbRemoteAddr = sizeof(RemoteAddr);
|
---|
658 | RTSOCKET hClientSocket;
|
---|
659 | RT_ZERO(RemoteAddr);
|
---|
660 | rc = rtSocketAccept(hServerSocket, &hClientSocket, (struct sockaddr *)&RemoteAddr, &cbRemoteAddr);
|
---|
661 | RTSocketRelease(hServerSocket);
|
---|
662 | if (RT_FAILURE(rc))
|
---|
663 | {
|
---|
664 | if (!rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_CREATED, RTTCPSERVERSTATE_ACCEPTING))
|
---|
665 | rc = rtTcpServerListenCleanup(pServer);
|
---|
666 | if (RT_FAILURE(rc))
|
---|
667 | break;
|
---|
668 | continue;
|
---|
669 | }
|
---|
670 | RTSocketSetInheritance(hClientSocket, false /*fInheritable*/);
|
---|
671 |
|
---|
672 | /*
|
---|
673 | * Chance to the 'serving' state and return the socket.
|
---|
674 | */
|
---|
675 | if (rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_SERVING, RTTCPSERVERSTATE_ACCEPTING))
|
---|
676 | {
|
---|
677 | *phClientSocket = hClientSocket;
|
---|
678 | rc = VINF_SUCCESS;
|
---|
679 | }
|
---|
680 | else
|
---|
681 | {
|
---|
682 | rtTcpClose(hClientSocket, "RTTcpServerListen2", true /*fTryGracefulShutdown*/);
|
---|
683 | rc = rtTcpServerListenCleanup(pServer);
|
---|
684 | }
|
---|
685 | break;
|
---|
686 | }
|
---|
687 |
|
---|
688 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
|
---|
689 | return rc;
|
---|
690 | }
|
---|
691 |
|
---|
692 |
|
---|
693 | /**
|
---|
694 | * Terminate the open connection to the server.
|
---|
695 | *
|
---|
696 | * @returns iprt status code.
|
---|
697 | * @param pServer Handle to the server.
|
---|
698 | */
|
---|
699 | RTR3DECL(int) RTTcpServerDisconnectClient(PRTTCPSERVER pServer)
|
---|
700 | {
|
---|
701 | /*
|
---|
702 | * Validate input and retain the instance.
|
---|
703 | */
|
---|
704 | AssertPtrReturn(pServer, VERR_INVALID_HANDLE);
|
---|
705 | AssertReturn(pServer->u32Magic == RTTCPSERVER_MAGIC, VERR_INVALID_HANDLE);
|
---|
706 | AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE);
|
---|
707 |
|
---|
708 | int rc = rtTcpServerDestroySocket(&pServer->hClientSocket, "DisconnectClient: client", true /*fTryGracefulShutdown*/);
|
---|
709 |
|
---|
710 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
|
---|
711 | return rc;
|
---|
712 | }
|
---|
713 |
|
---|
714 |
|
---|
715 | /**
|
---|
716 | * Terminates an open client connect when using RTTcpListen2
|
---|
717 | *
|
---|
718 | * @returns IPRT status code.
|
---|
719 | * @param hClientSocket The client socket handle. This will be invalid upon
|
---|
720 | * return, whether successful or not. NIL is quietly
|
---|
721 | * ignored (VINF_SUCCESS).
|
---|
722 | */
|
---|
723 | RTR3DECL(int) RTTcpServerDisconnectClient2(RTSOCKET hClientSocket)
|
---|
724 | {
|
---|
725 | return rtTcpClose(hClientSocket, "RTTcpServerDisconnectClient2", true /*fTryGracefulShutdown*/);
|
---|
726 | }
|
---|
727 |
|
---|
728 |
|
---|
729 | /**
|
---|
730 | * Shuts down the server, leaving client connections open.
|
---|
731 | *
|
---|
732 | * @returns IPRT status code.
|
---|
733 | * @param pServer Handle to the server.
|
---|
734 | */
|
---|
735 | RTR3DECL(int) RTTcpServerShutdown(PRTTCPSERVER pServer)
|
---|
736 | {
|
---|
737 | /*
|
---|
738 | * Validate input and retain the instance.
|
---|
739 | */
|
---|
740 | AssertPtrReturn(pServer, VERR_INVALID_HANDLE);
|
---|
741 | AssertReturn(pServer->u32Magic == RTTCPSERVER_MAGIC, VERR_INVALID_HANDLE);
|
---|
742 | AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE);
|
---|
743 |
|
---|
744 | /*
|
---|
745 | * Try change the state to stopping, then replace and destroy the server socket.
|
---|
746 | */
|
---|
747 | for (;;)
|
---|
748 | {
|
---|
749 | RTTCPSERVERSTATE enmState = pServer->enmState;
|
---|
750 | if ( enmState != RTTCPSERVERSTATE_ACCEPTING
|
---|
751 | && enmState != RTTCPSERVERSTATE_SERVING)
|
---|
752 | {
|
---|
753 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
|
---|
754 | switch (enmState)
|
---|
755 | {
|
---|
756 | case RTTCPSERVERSTATE_CREATED:
|
---|
757 | case RTTCPSERVERSTATE_STARTING:
|
---|
758 | default:
|
---|
759 | AssertMsgFailed(("%d\n", enmState));
|
---|
760 | return VERR_INVALID_STATE;
|
---|
761 |
|
---|
762 | case RTTCPSERVERSTATE_STOPPING:
|
---|
763 | case RTTCPSERVERSTATE_STOPPED:
|
---|
764 | return VINF_SUCCESS;
|
---|
765 |
|
---|
766 | case RTTCPSERVERSTATE_DESTROYING:
|
---|
767 | return VERR_TCP_SERVER_DESTROYED;
|
---|
768 | }
|
---|
769 | }
|
---|
770 | if (rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_STOPPING, enmState))
|
---|
771 | {
|
---|
772 | rtTcpServerDestroySocket(&pServer->hServerSocket, "RTTcpServerShutdown", false /*fTryGracefulShutdown*/);
|
---|
773 | rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPED, RTTCPSERVERSTATE_STOPPING);
|
---|
774 |
|
---|
775 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
|
---|
776 | return VINF_SUCCESS;
|
---|
777 | }
|
---|
778 | }
|
---|
779 | }
|
---|
780 |
|
---|
781 |
|
---|
782 | /**
|
---|
783 | * Closes down and frees a TCP Server.
|
---|
784 | * This will also terminate any open connections to the server.
|
---|
785 | *
|
---|
786 | * @returns iprt status code.
|
---|
787 | * @param pServer Handle to the server.
|
---|
788 | */
|
---|
789 | RTR3DECL(int) RTTcpServerDestroy(PRTTCPSERVER pServer)
|
---|
790 | {
|
---|
791 | /*
|
---|
792 | * Validate input and retain the instance.
|
---|
793 | */
|
---|
794 | AssertPtrReturn(pServer, VERR_INVALID_HANDLE);
|
---|
795 | AssertReturn(pServer->u32Magic == RTTCPSERVER_MAGIC, VERR_INVALID_HANDLE);
|
---|
796 | AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE); /* paranoia */
|
---|
797 |
|
---|
798 | /*
|
---|
799 | * Move the state along so the listener can figure out what's going on.
|
---|
800 | */
|
---|
801 | for (;;)
|
---|
802 | {
|
---|
803 | bool fDestroyable;
|
---|
804 | RTTCPSERVERSTATE enmState = pServer->enmState;
|
---|
805 | switch (enmState)
|
---|
806 | {
|
---|
807 | case RTTCPSERVERSTATE_STARTING:
|
---|
808 | case RTTCPSERVERSTATE_ACCEPTING:
|
---|
809 | case RTTCPSERVERSTATE_SERVING:
|
---|
810 | case RTTCPSERVERSTATE_CREATED:
|
---|
811 | case RTTCPSERVERSTATE_STOPPED:
|
---|
812 | fDestroyable = rtTcpServerTrySetState(pServer, RTTCPSERVERSTATE_DESTROYING, enmState);
|
---|
813 | break;
|
---|
814 |
|
---|
815 | /* destroyable states */
|
---|
816 | case RTTCPSERVERSTATE_STOPPING:
|
---|
817 | fDestroyable = true;
|
---|
818 | break;
|
---|
819 |
|
---|
820 | /*
|
---|
821 | * Everything else means user or internal misbehavior.
|
---|
822 | */
|
---|
823 | default:
|
---|
824 | AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
|
---|
825 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
|
---|
826 | return VERR_INTERNAL_ERROR;
|
---|
827 | }
|
---|
828 | if (fDestroyable)
|
---|
829 | break;
|
---|
830 | }
|
---|
831 |
|
---|
832 | /*
|
---|
833 | * Destroy it.
|
---|
834 | */
|
---|
835 | ASMAtomicWriteU32(&pServer->u32Magic, ~RTTCPSERVER_MAGIC);
|
---|
836 | rtTcpServerDestroySocket(&pServer->hServerSocket, "Destroyer: server", false /*fTryGracefulShutdown*/);
|
---|
837 | rtTcpServerDestroySocket(&pServer->hClientSocket, "Destroyer: client", true /*fTryGracefulShutdown*/);
|
---|
838 |
|
---|
839 | /*
|
---|
840 | * Release it.
|
---|
841 | */
|
---|
842 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
|
---|
843 | RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
|
---|
844 | return VINF_SUCCESS;
|
---|
845 | }
|
---|
846 |
|
---|
847 |
|
---|
848 | RTR3DECL(int) RTTcpClientConnect(const char *pszAddress, uint32_t uPort, PRTSOCKET pSock)
|
---|
849 | {
|
---|
850 | int rc;
|
---|
851 |
|
---|
852 | /*
|
---|
853 | * Validate input.
|
---|
854 | */
|
---|
855 | AssertReturn(uPort > 0, VERR_INVALID_PARAMETER);
|
---|
856 | AssertPtrReturn(pszAddress, VERR_INVALID_POINTER);
|
---|
857 |
|
---|
858 | #ifdef RT_OS_WINDOWS
|
---|
859 | /*
|
---|
860 | * Initialize WinSock and check version.
|
---|
861 | */
|
---|
862 | WORD wVersionRequested = MAKEWORD(1, 1);
|
---|
863 | WSADATA wsaData;
|
---|
864 | rc = WSAStartup(wVersionRequested, &wsaData);
|
---|
865 | if (wsaData.wVersion != wVersionRequested)
|
---|
866 | {
|
---|
867 | AssertMsgFailed(("Wrong winsock version\n"));
|
---|
868 | return VERR_NOT_SUPPORTED;
|
---|
869 | }
|
---|
870 | #endif
|
---|
871 |
|
---|
872 | /*
|
---|
873 | * Resolve the address.
|
---|
874 | */
|
---|
875 | struct hostent *pHostEnt = NULL;
|
---|
876 | pHostEnt = gethostbyname(pszAddress);
|
---|
877 | if (!pHostEnt)
|
---|
878 | {
|
---|
879 | struct in_addr InAddr;
|
---|
880 | InAddr.s_addr = inet_addr(pszAddress);
|
---|
881 | pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
|
---|
882 | if (!pHostEnt)
|
---|
883 | {
|
---|
884 | rc = rtSocketResolverError();
|
---|
885 | AssertMsgFailed(("Could not resolve '%s', rc=%Rrc\n", pszAddress, rc));
|
---|
886 | return rc;
|
---|
887 | }
|
---|
888 | }
|
---|
889 |
|
---|
890 | /*
|
---|
891 | * Create the socket and connect.
|
---|
892 | */
|
---|
893 | RTSOCKET Sock;
|
---|
894 | rc = rtSocketCreate(&Sock, PF_INET, SOCK_STREAM, 0);
|
---|
895 | if (RT_SUCCESS(rc))
|
---|
896 | {
|
---|
897 | RTSocketSetInheritance(Sock, false /*fInheritable*/);
|
---|
898 |
|
---|
899 | struct sockaddr_in InAddr;
|
---|
900 | RT_ZERO(InAddr);
|
---|
901 | InAddr.sin_family = AF_INET;
|
---|
902 | InAddr.sin_port = htons(uPort);
|
---|
903 | InAddr.sin_addr = *((struct in_addr *)pHostEnt->h_addr);
|
---|
904 | rc = rtSocketConnect(Sock, (struct sockaddr *)&InAddr, sizeof(InAddr));
|
---|
905 | if (RT_SUCCESS(rc))
|
---|
906 | {
|
---|
907 | *pSock = Sock;
|
---|
908 | return VINF_SUCCESS;
|
---|
909 | }
|
---|
910 |
|
---|
911 | rtTcpClose(Sock, "RTTcpClientConnect", false /*fTryGracefulShutdown*/);
|
---|
912 | }
|
---|
913 | return rc;
|
---|
914 | }
|
---|
915 |
|
---|
916 |
|
---|
917 | RTR3DECL(int) RTTcpClientClose(RTSOCKET Sock)
|
---|
918 | {
|
---|
919 | return rtTcpClose(Sock, "RTTcpClientClose", true /*fTryGracefulShutdown*/);
|
---|
920 | }
|
---|
921 |
|
---|
922 |
|
---|
923 | /**
|
---|
924 | * Internal close function which does all the proper bitching.
|
---|
925 | */
|
---|
926 | static int rtTcpClose(RTSOCKET Sock, const char *pszMsg, bool fTryGracefulShutdown)
|
---|
927 | {
|
---|
928 | int rc;
|
---|
929 |
|
---|
930 | /* ignore nil handles. */
|
---|
931 | if (Sock == NIL_RTSOCKET)
|
---|
932 | return VINF_SUCCESS;
|
---|
933 |
|
---|
934 | /*
|
---|
935 | * Try to gracefully shut it down.
|
---|
936 | */
|
---|
937 | if (fTryGracefulShutdown)
|
---|
938 | {
|
---|
939 | rc = RTSocketShutdown(Sock, false /*fRead*/, true /*fWrite*/);
|
---|
940 | if (RT_SUCCESS(rc))
|
---|
941 | {
|
---|
942 | uint64_t u64Start = RTTimeMilliTS();
|
---|
943 | for (;;)
|
---|
944 | {
|
---|
945 | rc = RTSocketSelectOne(Sock, 1000);
|
---|
946 | if (rc == VERR_TIMEOUT)
|
---|
947 | {
|
---|
948 | if (RTTimeMilliTS() - u64Start > 30000)
|
---|
949 | break;
|
---|
950 | }
|
---|
951 | else if (rc != VINF_SUCCESS)
|
---|
952 | break;
|
---|
953 | {
|
---|
954 | char abBitBucket[16*_1K];
|
---|
955 | ssize_t cbBytesRead = recv(RTSocketToNative(Sock), &abBitBucket[0], sizeof(abBitBucket), MSG_NOSIGNAL);
|
---|
956 | if (cbBytesRead == 0)
|
---|
957 | break; /* orderly shutdown in progress */
|
---|
958 | if (cbBytesRead < 0)
|
---|
959 | break; /* some kind of error, never mind which... */
|
---|
960 | }
|
---|
961 | } /* forever */
|
---|
962 | }
|
---|
963 | }
|
---|
964 |
|
---|
965 | /*
|
---|
966 | * Close the socket handle (drops our reference to it).
|
---|
967 | */
|
---|
968 | return RTSocketClose(Sock);
|
---|
969 | }
|
---|
970 |
|
---|
971 |
|
---|
972 | RTR3DECL(int) RTTcpRead(RTSOCKET Sock, void *pvBuffer, size_t cbBuffer, size_t *pcbRead)
|
---|
973 | {
|
---|
974 | return RTSocketRead(Sock, pvBuffer, cbBuffer, pcbRead);
|
---|
975 | }
|
---|
976 |
|
---|
977 |
|
---|
978 | RTR3DECL(int) RTTcpWrite(RTSOCKET Sock, const void *pvBuffer, size_t cbBuffer)
|
---|
979 | {
|
---|
980 | return RTSocketWrite(Sock, pvBuffer, cbBuffer);
|
---|
981 | }
|
---|
982 |
|
---|
983 |
|
---|
984 | RTR3DECL(int) RTTcpFlush(RTSOCKET Sock)
|
---|
985 | {
|
---|
986 |
|
---|
987 | int fFlag = 1;
|
---|
988 | int rc = rtSocketSetOpt(Sock, IPPROTO_TCP, TCP_NODELAY, &fFlag, sizeof(fFlag));
|
---|
989 | if (RT_SUCCESS(rc))
|
---|
990 | {
|
---|
991 | fFlag = 0;
|
---|
992 | rc = rtSocketSetOpt(Sock, IPPROTO_TCP, TCP_NODELAY, &fFlag, sizeof(fFlag));
|
---|
993 | }
|
---|
994 | return rc;
|
---|
995 | }
|
---|
996 |
|
---|
997 |
|
---|
998 | RTR3DECL(int) RTTcpSelectOne(RTSOCKET Sock, RTMSINTERVAL cMillies)
|
---|
999 | {
|
---|
1000 | return RTSocketSelectOne(Sock, cMillies);
|
---|
1001 | }
|
---|
1002 |
|
---|
1003 |
|
---|
1004 | RTR3DECL(int) RTTcpGetLocalAddress(RTSOCKET Sock, PRTNETADDR pAddr)
|
---|
1005 | {
|
---|
1006 | return RTSocketGetLocalAddress(Sock, pAddr);
|
---|
1007 | }
|
---|
1008 |
|
---|
1009 |
|
---|
1010 | RTR3DECL(int) RTTcpGetPeerAddress(RTSOCKET Sock, PRTNETADDR pAddr)
|
---|
1011 | {
|
---|
1012 | return RTSocketGetPeerAddress(Sock, pAddr);
|
---|
1013 | }
|
---|
1014 |
|
---|