author | coleenp |
Fri, 16 Mar 2018 09:12:13 -0400 | |
changeset 49449 | ef5d5d343e2a |
parent 47216 | 71c04702a3d5 |
child 49593 | 4dd58ecc9912 |
permissions | -rw-r--r-- |
10565 | 1 |
/* |
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* Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "runtime/interfaceSupport.inline.hpp" |
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#include "runtime/os.inline.hpp" |
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#include "services/attachListener.hpp" |
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#include "services/dtraceAttacher.hpp" |
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#include <unistd.h> |
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#include <signal.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/un.h> |
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#include <sys/stat.h> |
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#ifndef UNIX_PATH_MAX |
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#define UNIX_PATH_MAX sizeof(((struct sockaddr_un *)0)->sun_path) |
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#endif |
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// The attach mechanism on Bsd uses a UNIX domain socket. An attach listener |
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// thread is created at startup or is created on-demand via a signal from |
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// the client tool. The attach listener creates a socket and binds it to a file |
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// in the filesystem. The attach listener then acts as a simple (single- |
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// threaded) server - it waits for a client to connect, reads the request, |
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// executes it, and returns the response to the client via the socket |
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// connection. |
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// |
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// As the socket is a UNIX domain socket it means that only clients on the |
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// local machine can connect. In addition there are two other aspects to |
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// the security: |
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// 1. The well known file that the socket is bound to has permission 400 |
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// 2. When a client connect, the SO_PEERCRED socket option is used to |
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// obtain the credentials of client. We check that the effective uid |
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// of the client matches this process. |
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// forward reference |
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class BsdAttachOperation; |
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class BsdAttachListener: AllStatic { |
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private: |
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// the path to which we bind the UNIX domain socket |
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static char _path[UNIX_PATH_MAX]; |
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static bool _has_path; |
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// the file descriptor for the listening socket |
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static int _listener; |
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static void set_path(char* path) { |
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if (path == NULL) { |
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_has_path = false; |
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} else { |
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strncpy(_path, path, UNIX_PATH_MAX); |
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_path[UNIX_PATH_MAX-1] = '\0'; |
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_has_path = true; |
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} |
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} |
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static void set_listener(int s) { _listener = s; } |
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// reads a request from the given connected socket |
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static BsdAttachOperation* read_request(int s); |
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public: |
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enum { |
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ATTACH_PROTOCOL_VER = 1 // protocol version |
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}; |
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enum { |
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ATTACH_ERROR_BADVERSION = 101 // error codes |
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}; |
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// initialize the listener, returns 0 if okay |
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static int init(); |
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static char* path() { return _path; } |
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static bool has_path() { return _has_path; } |
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static int listener() { return _listener; } |
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// write the given buffer to a socket |
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static int write_fully(int s, char* buf, int len); |
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static BsdAttachOperation* dequeue(); |
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}; |
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class BsdAttachOperation: public AttachOperation { |
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private: |
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// the connection to the client |
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int _socket; |
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public: |
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void complete(jint res, bufferedStream* st); |
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void set_socket(int s) { _socket = s; } |
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int socket() const { return _socket; } |
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BsdAttachOperation(char* name) : AttachOperation(name) { |
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set_socket(-1); |
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} |
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}; |
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// statics |
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char BsdAttachListener::_path[UNIX_PATH_MAX]; |
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bool BsdAttachListener::_has_path; |
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int BsdAttachListener::_listener = -1; |
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// Supporting class to help split a buffer into individual components |
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class ArgumentIterator : public StackObj { |
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private: |
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char* _pos; |
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char* _end; |
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public: |
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ArgumentIterator(char* arg_buffer, size_t arg_size) { |
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_pos = arg_buffer; |
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_end = _pos + arg_size - 1; |
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} |
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char* next() { |
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if (*_pos == '\0') { |
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return NULL; |
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} |
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char* res = _pos; |
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char* next_pos = strchr(_pos, '\0'); |
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if (next_pos < _end) { |
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next_pos++; |
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} |
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_pos = next_pos; |
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return res; |
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} |
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}; |
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// atexit hook to stop listener and unlink the file that it is |
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// bound too. |
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extern "C" { |
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static void listener_cleanup() { |
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static int cleanup_done; |
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if (!cleanup_done) { |
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cleanup_done = 1; |
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int s = BsdAttachListener::listener(); |
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if (s != -1) { |
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::close(s); |
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} |
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if (BsdAttachListener::has_path()) { |
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::unlink(BsdAttachListener::path()); |
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} |
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} |
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} |
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} |
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// Initialization - create a listener socket and bind it to a file |
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int BsdAttachListener::init() { |
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char path[UNIX_PATH_MAX]; // socket file |
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char initial_path[UNIX_PATH_MAX]; // socket file during setup |
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int listener; // listener socket (file descriptor) |
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// register function to cleanup |
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::atexit(listener_cleanup); |
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int n = snprintf(path, UNIX_PATH_MAX, "%s/.java_pid%d", |
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os::get_temp_directory(), os::current_process_id()); |
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if (n < (int)UNIX_PATH_MAX) { |
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n = snprintf(initial_path, UNIX_PATH_MAX, "%s.tmp", path); |
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} |
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if (n >= (int)UNIX_PATH_MAX) { |
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return -1; |
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} |
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// create the listener socket |
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listener = ::socket(PF_UNIX, SOCK_STREAM, 0); |
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if (listener == -1) { |
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return -1; |
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} |
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// bind socket |
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struct sockaddr_un addr; |
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addr.sun_family = AF_UNIX; |
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strcpy(addr.sun_path, initial_path); |
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::unlink(initial_path); |
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int res = ::bind(listener, (struct sockaddr*)&addr, sizeof(addr)); |
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if (res == -1) { |
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::close(listener); |
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return -1; |
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} |
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// put in listen mode, set permissions, and rename into place |
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res = ::listen(listener, 5); |
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if (res == 0) { |
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RESTARTABLE(::chmod(initial_path, S_IREAD|S_IWRITE), res); |
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if (res == 0) { |
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// make sure the file is owned by the effective user and effective group |
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// (this is the default on linux, but not on mac os) |
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RESTARTABLE(::chown(initial_path, geteuid(), getegid()), res); |
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if (res == 0) { |
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res = ::rename(initial_path, path); |
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} |
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} |
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} |
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if (res == -1) { |
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::close(listener); |
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::unlink(initial_path); |
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return -1; |
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} |
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set_path(path); |
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set_listener(listener); |
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return 0; |
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} |
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// Given a socket that is connected to a peer we read the request and |
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// create an AttachOperation. As the socket is blocking there is potential |
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// for a denial-of-service if the peer does not response. However this happens |
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// after the peer credentials have been checked and in the worst case it just |
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// means that the attach listener thread is blocked. |
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// |
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BsdAttachOperation* BsdAttachListener::read_request(int s) { |
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char ver_str[8]; |
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sprintf(ver_str, "%d", ATTACH_PROTOCOL_VER); |
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// The request is a sequence of strings so we first figure out the |
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// expected count and the maximum possible length of the request. |
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// The request is: |
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// <ver>0<cmd>0<arg>0<arg>0<arg>0 |
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// where <ver> is the protocol version (1), <cmd> is the command |
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// name ("load", "datadump", ...), and <arg> is an argument |
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int expected_str_count = 2 + AttachOperation::arg_count_max; |
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const int max_len = (sizeof(ver_str) + 1) + (AttachOperation::name_length_max + 1) + |
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AttachOperation::arg_count_max*(AttachOperation::arg_length_max + 1); |
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char buf[max_len]; |
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int str_count = 0; |
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// Read until all (expected) strings have been read, the buffer is |
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// full, or EOF. |
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int off = 0; |
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int left = max_len; |
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do { |
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int n; |
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RESTARTABLE(read(s, buf+off, left), n); |
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if (n == -1) { |
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return NULL; // reset by peer or other error |
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} |
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if (n == 0) { |
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break; |
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} |
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for (int i=0; i<n; i++) { |
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if (buf[off+i] == 0) { |
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// EOS found |
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str_count++; |
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// The first string is <ver> so check it now to |
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// check for protocol mis-match |
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if (str_count == 1) { |
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if ((strlen(buf) != strlen(ver_str)) || |
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(atoi(buf) != ATTACH_PROTOCOL_VER)) { |
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char msg[32]; |
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sprintf(msg, "%d\n", ATTACH_ERROR_BADVERSION); |
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write_fully(s, msg, strlen(msg)); |
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return NULL; |
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} |
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} |
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} |
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} |
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off += n; |
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left -= n; |
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288 |
} while (left > 0 && str_count < expected_str_count); |
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289 |
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290 |
if (str_count != expected_str_count) { |
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291 |
return NULL; // incomplete request |
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292 |
} |
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293 |
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294 |
// parse request |
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295 |
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296 |
ArgumentIterator args(buf, (max_len)-left); |
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297 |
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298 |
// version already checked |
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299 |
char* v = args.next(); |
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300 |
||
301 |
char* name = args.next(); |
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302 |
if (name == NULL || strlen(name) > AttachOperation::name_length_max) { |
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303 |
return NULL; |
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304 |
} |
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305 |
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306 |
BsdAttachOperation* op = new BsdAttachOperation(name); |
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307 |
||
308 |
for (int i=0; i<AttachOperation::arg_count_max; i++) { |
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309 |
char* arg = args.next(); |
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310 |
if (arg == NULL) { |
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311 |
op->set_arg(i, NULL); |
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312 |
} else { |
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313 |
if (strlen(arg) > AttachOperation::arg_length_max) { |
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314 |
delete op; |
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315 |
return NULL; |
|
316 |
} |
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317 |
op->set_arg(i, arg); |
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318 |
} |
|
319 |
} |
|
320 |
||
321 |
op->set_socket(s); |
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322 |
return op; |
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323 |
} |
|
324 |
||
325 |
||
326 |
// Dequeue an operation |
|
327 |
// |
|
328 |
// In the Bsd implementation there is only a single operation and clients |
|
329 |
// cannot queue commands (except at the socket level). |
|
330 |
// |
|
331 |
BsdAttachOperation* BsdAttachListener::dequeue() { |
|
332 |
for (;;) { |
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333 |
int s; |
|
334 |
||
335 |
// wait for client to connect |
|
336 |
struct sockaddr addr; |
|
337 |
socklen_t len = sizeof(addr); |
|
338 |
RESTARTABLE(::accept(listener(), &addr, &len), s); |
|
339 |
if (s == -1) { |
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340 |
return NULL; // log a warning? |
|
341 |
} |
|
342 |
||
343 |
// get the credentials of the peer and check the effective uid/guid |
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344 |
// - check with jeff on this. |
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345 |
uid_t puid; |
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346 |
gid_t pgid; |
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347 |
if (::getpeereid(s, &puid, &pgid) != 0) { |
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::close(s); |
10565 | 349 |
continue; |
350 |
} |
|
351 |
uid_t euid = geteuid(); |
|
352 |
gid_t egid = getegid(); |
|
353 |
||
354 |
if (puid != euid || pgid != egid) { |
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::close(s); |
10565 | 356 |
continue; |
357 |
} |
|
358 |
||
359 |
// peer credential look okay so we read the request |
|
360 |
BsdAttachOperation* op = read_request(s); |
|
361 |
if (op == NULL) { |
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362 |
::close(s); |
10565 | 363 |
continue; |
364 |
} else { |
|
365 |
return op; |
|
366 |
} |
|
367 |
} |
|
368 |
} |
|
369 |
||
370 |
// write the given buffer to the socket |
|
371 |
int BsdAttachListener::write_fully(int s, char* buf, int len) { |
|
372 |
do { |
|
373 |
int n = ::write(s, buf, len); |
|
374 |
if (n == -1) { |
|
375 |
if (errno != EINTR) return -1; |
|
376 |
} else { |
|
377 |
buf += n; |
|
378 |
len -= n; |
|
379 |
} |
|
380 |
} |
|
381 |
while (len > 0); |
|
382 |
return 0; |
|
383 |
} |
|
384 |
||
385 |
// Complete an operation by sending the operation result and any result |
|
386 |
// output to the client. At this time the socket is in blocking mode so |
|
387 |
// potentially we can block if there is a lot of data and the client is |
|
388 |
// non-responsive. For most operations this is a non-issue because the |
|
389 |
// default send buffer is sufficient to buffer everything. In the future |
|
390 |
// if there are operations that involves a very big reply then it the |
|
391 |
// socket could be made non-blocking and a timeout could be used. |
|
392 |
||
393 |
void BsdAttachOperation::complete(jint result, bufferedStream* st) { |
|
394 |
JavaThread* thread = JavaThread::current(); |
|
395 |
ThreadBlockInVM tbivm(thread); |
|
396 |
||
397 |
thread->set_suspend_equivalent(); |
|
398 |
// cleared by handle_special_suspend_equivalent_condition() or |
|
399 |
// java_suspend_self() via check_and_wait_while_suspended() |
|
400 |
||
401 |
// write operation result |
|
402 |
char msg[32]; |
|
403 |
sprintf(msg, "%d\n", result); |
|
404 |
int rc = BsdAttachListener::write_fully(this->socket(), msg, strlen(msg)); |
|
405 |
||
406 |
// write any result data |
|
407 |
if (rc == 0) { |
|
408 |
BsdAttachListener::write_fully(this->socket(), (char*) st->base(), st->size()); |
|
409 |
::shutdown(this->socket(), 2); |
|
410 |
} |
|
411 |
||
412 |
// done |
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413 |
::close(this->socket()); |
10565 | 414 |
|
415 |
// were we externally suspended while we were waiting? |
|
416 |
thread->check_and_wait_while_suspended(); |
|
417 |
||
418 |
delete this; |
|
419 |
} |
|
420 |
||
421 |
||
422 |
// AttachListener functions |
|
423 |
||
424 |
AttachOperation* AttachListener::dequeue() { |
|
425 |
JavaThread* thread = JavaThread::current(); |
|
426 |
ThreadBlockInVM tbivm(thread); |
|
427 |
||
428 |
thread->set_suspend_equivalent(); |
|
429 |
// cleared by handle_special_suspend_equivalent_condition() or |
|
430 |
// java_suspend_self() via check_and_wait_while_suspended() |
|
431 |
||
432 |
AttachOperation* op = BsdAttachListener::dequeue(); |
|
433 |
||
434 |
// were we externally suspended while we were waiting? |
|
435 |
thread->check_and_wait_while_suspended(); |
|
436 |
||
437 |
return op; |
|
438 |
} |
|
439 |
||
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|
440 |
|
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|
441 |
// Performs initialization at vm startup |
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|
442 |
// For BSD we remove any stale .java_pid file which could cause |
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|
443 |
// an attaching process to think we are ready to receive on the |
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|
444 |
// domain socket before we are properly initialized |
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|
445 |
|
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|
446 |
void AttachListener::vm_start() { |
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|
447 |
char fn[UNIX_PATH_MAX]; |
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448 |
struct stat st; |
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449 |
int ret; |
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|
450 |
|
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|
451 |
int n = snprintf(fn, UNIX_PATH_MAX, "%s/.java_pid%d", |
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|
452 |
os::get_temp_directory(), os::current_process_id()); |
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|
453 |
assert(n < (int)UNIX_PATH_MAX, "java_pid file name buffer overflow"); |
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|
454 |
|
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|
455 |
RESTARTABLE(::stat(fn, &st), ret); |
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|
456 |
if (ret == 0) { |
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|
457 |
ret = ::unlink(fn); |
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|
458 |
if (ret == -1) { |
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|
459 |
log_debug(attach)("Failed to remove stale attach pid file at %s", fn); |
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|
460 |
} |
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|
461 |
} |
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|
462 |
} |
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|
463 |
|
10565 | 464 |
int AttachListener::pd_init() { |
465 |
JavaThread* thread = JavaThread::current(); |
|
466 |
ThreadBlockInVM tbivm(thread); |
|
467 |
||
468 |
thread->set_suspend_equivalent(); |
|
469 |
// cleared by handle_special_suspend_equivalent_condition() or |
|
470 |
// java_suspend_self() via check_and_wait_while_suspended() |
|
471 |
||
472 |
int ret_code = BsdAttachListener::init(); |
|
473 |
||
474 |
// were we externally suspended while we were waiting? |
|
475 |
thread->check_and_wait_while_suspended(); |
|
476 |
||
477 |
return ret_code; |
|
478 |
} |
|
479 |
||
480 |
// Attach Listener is started lazily except in the case when |
|
481 |
// +ReduseSignalUsage is used |
|
482 |
bool AttachListener::init_at_startup() { |
|
483 |
if (ReduceSignalUsage) { |
|
484 |
return true; |
|
485 |
} else { |
|
486 |
return false; |
|
487 |
} |
|
488 |
} |
|
489 |
||
490 |
// If the file .attach_pid<pid> exists in the working directory |
|
491 |
// or /tmp then this is the trigger to start the attach mechanism |
|
492 |
bool AttachListener::is_init_trigger() { |
|
493 |
if (init_at_startup() || is_initialized()) { |
|
494 |
return false; // initialized at startup or already initialized |
|
495 |
} |
|
40625
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changeset
|
496 |
char fn[PATH_MAX + 1]; |
10565 | 497 |
int ret; |
498 |
struct stat st; |
|
499 |
||
40625
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diff
changeset
|
500 |
snprintf(fn, PATH_MAX + 1, "%s/.attach_pid%d", |
10565 | 501 |
os::get_temp_directory(), os::current_process_id()); |
40625
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|
502 |
RESTARTABLE(::stat(fn, &st), ret); |
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8157236: attach on ARMv7 fails with com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file
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|
503 |
if (ret == -1) { |
6b45fb9188f9
8157236: attach on ARMv7 fails with com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file
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changeset
|
504 |
log_debug(attach)("Failed to find attach file: %s", fn); |
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8157236: attach on ARMv7 fails with com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file
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changeset
|
505 |
} |
10565 | 506 |
if (ret == 0) { |
507 |
// simple check to avoid starting the attach mechanism when |
|
508 |
// a bogus user creates the file |
|
509 |
if (st.st_uid == geteuid()) { |
|
510 |
init(); |
|
40625
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changeset
|
511 |
log_trace(attach)("Attach trigerred by %s", fn); |
10565 | 512 |
return true; |
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changeset
|
513 |
} else { |
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8157236: attach on ARMv7 fails with com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file
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changeset
|
514 |
log_debug(attach)("File %s has wrong user id %d (vs %d). Attach is not triggered", fn, st.st_uid, geteuid()); |
10565 | 515 |
} |
516 |
} |
|
517 |
return false; |
|
518 |
} |
|
519 |
||
520 |
// if VM aborts then remove listener |
|
521 |
void AttachListener::abort() { |
|
522 |
listener_cleanup(); |
|
523 |
} |
|
524 |
||
525 |
void AttachListener::pd_data_dump() { |
|
526 |
os::signal_notify(SIGQUIT); |
|
527 |
} |
|
528 |
||
529 |
AttachOperationFunctionInfo* AttachListener::pd_find_operation(const char* n) { |
|
530 |
return NULL; |
|
531 |
} |
|
532 |
||
533 |
jint AttachListener::pd_set_flag(AttachOperation* op, outputStream* out) { |
|
534 |
out->print_cr("flag '%s' cannot be changed", op->arg(0)); |
|
535 |
return JNI_ERR; |
|
536 |
} |
|
537 |
||
538 |
void AttachListener::pd_detachall() { |
|
539 |
// do nothing for now |
|
540 |
} |