Mercurial > hg > graal-compiler
annotate src/os/aix/vm/attachListener_aix.cpp @ 18429:79268cfc256a
StackSlot is no longer a VirtualStackSlot (rename ForwardingFrameMapBuilder to DelayedFrameMapBuilder).
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 05 Nov 2014 19:18:35 +0100 |
parents | 666e6ce3976c |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * Copyright 2012, 2013 SAP AG. All rights reserved. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 #include "precompiled.hpp" |
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27 #include "runtime/interfaceSupport.hpp" |
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28 #include "runtime/os.hpp" |
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29 #include "services/attachListener.hpp" |
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30 #include "services/dtraceAttacher.hpp" |
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31 |
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32 #include <unistd.h> |
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33 #include <signal.h> |
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34 #include <sys/types.h> |
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35 #include <sys/socket.h> |
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36 #include <sys/un.h> |
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37 #include <sys/stat.h> |
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38 |
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39 #ifndef UNIX_PATH_MAX |
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40 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *)0)->sun_path) |
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41 #endif |
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42 |
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43 // The attach mechanism on Linux uses a UNIX domain socket. An attach listener |
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44 // thread is created at startup or is created on-demand via a signal from |
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45 // the client tool. The attach listener creates a socket and binds it to a file |
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46 // in the filesystem. The attach listener then acts as a simple (single- |
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47 // threaded) server - it waits for a client to connect, reads the request, |
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48 // executes it, and returns the response to the client via the socket |
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49 // connection. |
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50 // |
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51 // As the socket is a UNIX domain socket it means that only clients on the |
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52 // local machine can connect. In addition there are two other aspects to |
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53 // the security: |
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54 // 1. The well known file that the socket is bound to has permission 400 |
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55 // 2. When a client connect, the SO_PEERID socket option is used to |
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56 // obtain the credentials of client. We check that the effective uid |
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57 // of the client matches this process. |
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58 |
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59 // forward reference |
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60 class AixAttachOperation; |
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61 |
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62 class AixAttachListener: AllStatic { |
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63 private: |
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64 // the path to which we bind the UNIX domain socket |
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65 static char _path[UNIX_PATH_MAX]; |
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66 static bool _has_path; |
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67 // Shutdown marker to prevent accept blocking during clean-up. |
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68 static bool _shutdown; |
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69 |
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70 // the file descriptor for the listening socket |
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71 static int _listener; |
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72 |
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73 static void set_path(char* path) { |
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74 if (path == NULL) { |
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75 _has_path = false; |
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76 } else { |
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77 strncpy(_path, path, UNIX_PATH_MAX); |
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78 _path[UNIX_PATH_MAX-1] = '\0'; |
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79 _has_path = true; |
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80 } |
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81 } |
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82 |
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83 static void set_listener(int s) { _listener = s; } |
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84 |
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85 // reads a request from the given connected socket |
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86 static AixAttachOperation* read_request(int s); |
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87 |
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88 public: |
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89 enum { |
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90 ATTACH_PROTOCOL_VER = 1 // protocol version |
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91 }; |
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92 enum { |
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93 ATTACH_ERROR_BADVERSION = 101 // error codes |
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94 }; |
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95 |
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96 // initialize the listener, returns 0 if okay |
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97 static int init(); |
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98 |
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99 static char* path() { return _path; } |
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100 static bool has_path() { return _has_path; } |
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101 static int listener() { return _listener; } |
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102 // Shutdown marker to prevent accept blocking during clean-up |
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103 static void set_shutdown(bool shutdown) { _shutdown = shutdown; } |
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104 static bool is_shutdown() { return _shutdown; } |
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105 |
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106 // write the given buffer to a socket |
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107 static int write_fully(int s, char* buf, int len); |
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108 |
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109 static AixAttachOperation* dequeue(); |
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110 }; |
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111 |
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112 class AixAttachOperation: public AttachOperation { |
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113 private: |
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114 // the connection to the client |
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115 int _socket; |
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116 |
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117 public: |
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118 void complete(jint res, bufferedStream* st); |
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119 |
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120 void set_socket(int s) { _socket = s; } |
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121 int socket() const { return _socket; } |
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122 |
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123 AixAttachOperation(char* name) : AttachOperation(name) { |
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124 set_socket(-1); |
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125 } |
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126 }; |
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127 |
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128 // statics |
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129 char AixAttachListener::_path[UNIX_PATH_MAX]; |
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130 bool AixAttachListener::_has_path; |
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131 int AixAttachListener::_listener = -1; |
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132 // Shutdown marker to prevent accept blocking during clean-up |
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133 bool AixAttachListener::_shutdown = false; |
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134 |
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135 // Supporting class to help split a buffer into individual components |
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136 class ArgumentIterator : public StackObj { |
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137 private: |
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138 char* _pos; |
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139 char* _end; |
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140 public: |
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141 ArgumentIterator(char* arg_buffer, size_t arg_size) { |
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142 _pos = arg_buffer; |
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143 _end = _pos + arg_size - 1; |
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144 } |
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145 char* next() { |
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146 if (*_pos == '\0') { |
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147 return NULL; |
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148 } |
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149 char* res = _pos; |
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150 char* next_pos = strchr(_pos, '\0'); |
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151 if (next_pos < _end) { |
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152 next_pos++; |
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153 } |
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154 _pos = next_pos; |
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155 return res; |
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156 } |
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157 }; |
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158 |
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159 // On AIX if sockets block until all data has been transmitted |
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160 // successfully in some communication domains a socket "close" may |
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161 // never complete. We have to take care that after the socket shutdown |
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162 // the listener never enters accept state. |
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163 |
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164 // atexit hook to stop listener and unlink the file that it is |
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165 // bound too. |
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166 |
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167 // Some modifications to the listener logic to prevent deadlocks on exit. |
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168 // 1. We Shutdown the socket here instead. AixAttachOperation::complete() is not the right place |
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169 // since more than one agent in a sequence in JPLIS live tests wouldn't work (Listener thread |
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170 // would be dead after the first operation completion). |
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171 // 2. close(s) may never return if the listener thread is in socket accept(). Unlinking the file |
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172 // should be sufficient for cleanup. |
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173 extern "C" { |
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174 static void listener_cleanup() { |
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175 static int cleanup_done; |
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176 if (!cleanup_done) { |
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177 cleanup_done = 1; |
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178 AixAttachListener::set_shutdown(true); |
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179 int s = AixAttachListener::listener(); |
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180 if (s != -1) { |
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181 ::shutdown(s, 2); |
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182 } |
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183 if (AixAttachListener::has_path()) { |
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184 ::unlink(AixAttachListener::path()); |
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185 } |
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186 } |
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187 } |
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188 } |
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189 |
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190 // Initialization - create a listener socket and bind it to a file |
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191 |
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192 int AixAttachListener::init() { |
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193 char path[UNIX_PATH_MAX]; // socket file |
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194 char initial_path[UNIX_PATH_MAX]; // socket file during setup |
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195 int listener; // listener socket (file descriptor) |
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196 |
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197 // register function to cleanup |
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198 ::atexit(listener_cleanup); |
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199 |
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200 int n = snprintf(path, UNIX_PATH_MAX, "%s/.java_pid%d", |
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201 os::get_temp_directory(), os::current_process_id()); |
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202 if (n < (int)UNIX_PATH_MAX) { |
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203 n = snprintf(initial_path, UNIX_PATH_MAX, "%s.tmp", path); |
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204 } |
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205 if (n >= (int)UNIX_PATH_MAX) { |
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206 return -1; |
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207 } |
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208 |
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209 // create the listener socket |
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210 listener = ::socket(PF_UNIX, SOCK_STREAM, 0); |
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211 if (listener == -1) { |
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212 return -1; |
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213 } |
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214 |
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215 // bind socket |
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216 struct sockaddr_un addr; |
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217 addr.sun_family = AF_UNIX; |
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218 strcpy(addr.sun_path, initial_path); |
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219 ::unlink(initial_path); |
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220 // We must call bind with the actual socketaddr length. This is obligatory for AS400. |
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221 int res = ::bind(listener, (struct sockaddr*)&addr, SUN_LEN(&addr)); |
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222 if (res == -1) { |
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223 RESTARTABLE(::close(listener), res); |
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224 return -1; |
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225 } |
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226 |
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227 // put in listen mode, set permissions, and rename into place |
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228 res = ::listen(listener, 5); |
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229 if (res == 0) { |
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230 RESTARTABLE(::chmod(initial_path, (S_IREAD|S_IWRITE) & ~(S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)), res); |
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231 if (res == 0) { |
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232 res = ::rename(initial_path, path); |
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233 } |
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234 } |
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235 if (res == -1) { |
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236 RESTARTABLE(::close(listener), res); |
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237 ::unlink(initial_path); |
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238 return -1; |
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239 } |
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240 set_path(path); |
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241 set_listener(listener); |
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242 set_shutdown(false); |
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243 |
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244 return 0; |
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245 } |
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246 |
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247 // Given a socket that is connected to a peer we read the request and |
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248 // create an AttachOperation. As the socket is blocking there is potential |
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249 // for a denial-of-service if the peer does not response. However this happens |
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250 // after the peer credentials have been checked and in the worst case it just |
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251 // means that the attach listener thread is blocked. |
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252 // |
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253 AixAttachOperation* AixAttachListener::read_request(int s) { |
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254 char ver_str[8]; |
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255 sprintf(ver_str, "%d", ATTACH_PROTOCOL_VER); |
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256 |
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257 // The request is a sequence of strings so we first figure out the |
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258 // expected count and the maximum possible length of the request. |
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259 // The request is: |
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260 // <ver>0<cmd>0<arg>0<arg>0<arg>0 |
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261 // where <ver> is the protocol version (1), <cmd> is the command |
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262 // name ("load", "datadump", ...), and <arg> is an argument |
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263 int expected_str_count = 2 + AttachOperation::arg_count_max; |
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264 const int max_len = (sizeof(ver_str) + 1) + (AttachOperation::name_length_max + 1) + |
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265 AttachOperation::arg_count_max*(AttachOperation::arg_length_max + 1); |
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266 |
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267 char buf[max_len]; |
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268 int str_count = 0; |
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269 |
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270 // Read until all (expected) strings have been read, the buffer is |
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271 // full, or EOF. |
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272 |
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273 int off = 0; |
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274 int left = max_len; |
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275 |
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276 do { |
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277 int n; |
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278 // Don't block on interrupts because this will |
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279 // hang in the clean-up when shutting down. |
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280 n = read(s, buf+off, left); |
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281 if (n == -1) { |
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282 return NULL; // reset by peer or other error |
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283 } |
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284 if (n == 0) { // end of file reached |
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285 break; |
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286 } |
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287 for (int i=0; i<n; i++) { |
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288 if (buf[off+i] == 0) { |
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289 // EOS found |
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290 str_count++; |
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291 |
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292 // The first string is <ver> so check it now to |
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293 // check for protocol mis-match |
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294 if (str_count == 1) { |
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295 if ((strlen(buf) != strlen(ver_str)) || |
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296 (atoi(buf) != ATTACH_PROTOCOL_VER)) { |
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297 char msg[32]; |
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298 sprintf(msg, "%d\n", ATTACH_ERROR_BADVERSION); |
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299 write_fully(s, msg, strlen(msg)); |
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300 return NULL; |
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301 } |
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302 } |
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303 } |
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304 } |
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305 off += n; |
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306 left -= n; |
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307 } while (left > 0 && str_count < expected_str_count); |
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308 |
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309 if (str_count != expected_str_count) { |
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310 return NULL; // incomplete request |
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311 } |
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312 |
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313 // parse request |
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314 |
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315 ArgumentIterator args(buf, (max_len)-left); |
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316 |
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317 // version already checked |
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318 char* v = args.next(); |
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319 |
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320 char* name = args.next(); |
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321 if (name == NULL || strlen(name) > AttachOperation::name_length_max) { |
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322 return NULL; |
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323 } |
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324 |
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325 AixAttachOperation* op = new AixAttachOperation(name); |
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326 |
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327 for (int i=0; i<AttachOperation::arg_count_max; i++) { |
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328 char* arg = args.next(); |
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329 if (arg == NULL) { |
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330 op->set_arg(i, NULL); |
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331 } else { |
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332 if (strlen(arg) > AttachOperation::arg_length_max) { |
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333 delete op; |
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334 return NULL; |
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335 } |
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336 op->set_arg(i, arg); |
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337 } |
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338 } |
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339 |
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340 op->set_socket(s); |
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341 return op; |
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342 } |
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343 |
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344 |
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345 // Dequeue an operation |
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346 // |
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347 // In the Linux implementation there is only a single operation and clients |
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348 // cannot queue commands (except at the socket level). |
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349 // |
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350 AixAttachOperation* AixAttachListener::dequeue() { |
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351 for (;;) { |
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352 int s; |
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353 |
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354 // wait for client to connect |
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355 struct sockaddr addr; |
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356 socklen_t len = sizeof(addr); |
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357 memset(&addr, 0, len); |
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358 // We must prevent accept blocking on the socket if it has been shut down. |
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359 // Therefore we allow interrups and check whether we have been shut down already. |
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360 if (AixAttachListener::is_shutdown()) { |
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361 return NULL; |
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362 } |
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363 s=::accept(listener(), &addr, &len); |
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364 if (s == -1) { |
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365 return NULL; // log a warning? |
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366 } |
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367 |
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368 // Added timeouts for read and write. If we get no request within the |
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369 // next AttachListenerTimeout milliseconds we just finish the connection. |
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370 struct timeval tv; |
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371 tv.tv_sec = 0; |
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372 tv.tv_usec = AttachListenerTimeout * 1000; |
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373 ::setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (char*)&tv, sizeof(tv)); |
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374 ::setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, (char*)&tv, sizeof(tv)); |
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375 |
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376 // get the credentials of the peer and check the effective uid/guid |
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377 // - check with jeff on this. |
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378 struct peercred_struct cred_info; |
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379 socklen_t optlen = sizeof(cred_info); |
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380 if (::getsockopt(s, SOL_SOCKET, SO_PEERID, (void*)&cred_info, &optlen) == -1) { |
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381 int res; |
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382 RESTARTABLE(::close(s), res); |
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383 continue; |
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384 } |
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385 uid_t euid = geteuid(); |
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386 gid_t egid = getegid(); |
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387 |
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388 if (cred_info.euid != euid || cred_info.egid != egid) { |
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389 int res; |
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390 RESTARTABLE(::close(s), res); |
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391 continue; |
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392 } |
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393 |
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394 // peer credential look okay so we read the request |
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395 AixAttachOperation* op = read_request(s); |
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396 if (op == NULL) { |
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397 int res; |
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398 RESTARTABLE(::close(s), res); |
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399 continue; |
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400 } else { |
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401 return op; |
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402 } |
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403 } |
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404 } |
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405 |
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406 // write the given buffer to the socket |
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407 int AixAttachListener::write_fully(int s, char* buf, int len) { |
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408 do { |
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409 int n = ::write(s, buf, len); |
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410 if (n == -1) { |
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411 if (errno != EINTR) return -1; |
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412 } else { |
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413 buf += n; |
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414 len -= n; |
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415 } |
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416 } |
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417 while (len > 0); |
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418 return 0; |
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419 } |
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420 |
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421 // Complete an operation by sending the operation result and any result |
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422 // output to the client. At this time the socket is in blocking mode so |
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423 // potentially we can block if there is a lot of data and the client is |
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424 // non-responsive. For most operations this is a non-issue because the |
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425 // default send buffer is sufficient to buffer everything. In the future |
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426 // if there are operations that involves a very big reply then it the |
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427 // socket could be made non-blocking and a timeout could be used. |
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428 |
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429 void AixAttachOperation::complete(jint result, bufferedStream* st) { |
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430 JavaThread* thread = JavaThread::current(); |
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431 ThreadBlockInVM tbivm(thread); |
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432 |
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433 thread->set_suspend_equivalent(); |
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434 // cleared by handle_special_suspend_equivalent_condition() or |
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435 // java_suspend_self() via check_and_wait_while_suspended() |
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436 |
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437 // write operation result |
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438 char msg[32]; |
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439 sprintf(msg, "%d\n", result); |
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440 int rc = AixAttachListener::write_fully(this->socket(), msg, strlen(msg)); |
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441 |
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442 // write any result data |
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443 if (rc == 0) { |
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444 // Shutdown the socket in the cleanup function to enable more than |
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445 // one agent attach in a sequence (see comments to listener_cleanup()). |
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446 AixAttachListener::write_fully(this->socket(), (char*) st->base(), st->size()); |
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447 } |
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448 |
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449 // done |
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450 RESTARTABLE(::close(this->socket()), rc); |
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451 |
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452 // were we externally suspended while we were waiting? |
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453 thread->check_and_wait_while_suspended(); |
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454 |
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455 delete this; |
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456 } |
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457 |
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458 |
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459 // AttachListener functions |
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460 |
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461 AttachOperation* AttachListener::dequeue() { |
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462 JavaThread* thread = JavaThread::current(); |
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463 ThreadBlockInVM tbivm(thread); |
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464 |
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465 thread->set_suspend_equivalent(); |
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466 // cleared by handle_special_suspend_equivalent_condition() or |
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467 // java_suspend_self() via check_and_wait_while_suspended() |
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468 |
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469 AttachOperation* op = AixAttachListener::dequeue(); |
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470 |
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471 // were we externally suspended while we were waiting? |
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472 thread->check_and_wait_while_suspended(); |
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473 |
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474 return op; |
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475 } |
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476 |
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477 // Performs initialization at vm startup |
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478 // For AIX we remove any stale .java_pid file which could cause |
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479 // an attaching process to think we are ready to receive on the |
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480 // domain socket before we are properly initialized |
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481 |
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482 void AttachListener::vm_start() { |
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483 char fn[UNIX_PATH_MAX]; |
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484 struct stat64 st; |
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485 int ret; |
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486 |
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487 int n = snprintf(fn, UNIX_PATH_MAX, "%s/.java_pid%d", |
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488 os::get_temp_directory(), os::current_process_id()); |
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489 assert(n < (int)UNIX_PATH_MAX, "java_pid file name buffer overflow"); |
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490 |
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491 RESTARTABLE(::stat64(fn, &st), ret); |
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492 if (ret == 0) { |
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493 ret = ::unlink(fn); |
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494 if (ret == -1) { |
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495 debug_only(warning("failed to remove stale attach pid file at %s", fn)); |
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496 } |
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497 } |
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498 } |
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499 |
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500 int AttachListener::pd_init() { |
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501 JavaThread* thread = JavaThread::current(); |
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502 ThreadBlockInVM tbivm(thread); |
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503 |
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504 thread->set_suspend_equivalent(); |
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505 // cleared by handle_special_suspend_equivalent_condition() or |
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506 // java_suspend_self() via check_and_wait_while_suspended() |
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507 |
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508 int ret_code = AixAttachListener::init(); |
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509 |
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510 // were we externally suspended while we were waiting? |
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511 thread->check_and_wait_while_suspended(); |
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512 |
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513 return ret_code; |
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514 } |
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515 |
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516 // Attach Listener is started lazily except in the case when |
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517 // +ReduseSignalUsage is used |
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518 bool AttachListener::init_at_startup() { |
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519 if (ReduceSignalUsage) { |
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520 return true; |
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521 } else { |
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522 return false; |
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523 } |
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524 } |
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525 |
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526 // If the file .attach_pid<pid> exists in the working directory |
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527 // or /tmp then this is the trigger to start the attach mechanism |
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528 bool AttachListener::is_init_trigger() { |
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529 if (init_at_startup() || is_initialized()) { |
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530 return false; // initialized at startup or already initialized |
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531 } |
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532 char fn[PATH_MAX+1]; |
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533 sprintf(fn, ".attach_pid%d", os::current_process_id()); |
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534 int ret; |
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535 struct stat64 st; |
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536 RESTARTABLE(::stat64(fn, &st), ret); |
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537 if (ret == -1) { |
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538 snprintf(fn, sizeof(fn), "%s/.attach_pid%d", |
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539 os::get_temp_directory(), os::current_process_id()); |
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540 RESTARTABLE(::stat64(fn, &st), ret); |
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541 } |
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542 if (ret == 0) { |
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543 // simple check to avoid starting the attach mechanism when |
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544 // a bogus user creates the file |
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545 if (st.st_uid == geteuid()) { |
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546 init(); |
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547 return true; |
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548 } |
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549 } |
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550 return false; |
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551 } |
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552 |
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553 // if VM aborts then remove listener |
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554 void AttachListener::abort() { |
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555 listener_cleanup(); |
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556 } |
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557 |
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558 void AttachListener::pd_data_dump() { |
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559 os::signal_notify(SIGQUIT); |
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560 } |
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561 |
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562 AttachOperationFunctionInfo* AttachListener::pd_find_operation(const char* n) { |
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563 return NULL; |
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564 } |
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565 |
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566 jint AttachListener::pd_set_flag(AttachOperation* op, outputStream* out) { |
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567 out->print_cr("flag '%s' cannot be changed", op->arg(0)); |
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568 return JNI_ERR; |
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569 } |
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570 |
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571 void AttachListener::pd_detachall() { |
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572 // Cleanup server socket to detach clients. |
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573 listener_cleanup(); |
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574 } |