author | michaelm |
Tue, 24 Sep 2019 16:19:11 +0100 | |
changeset 58295 | 7973073dd048 |
parent 52778 | dbbf46b13d52 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2019, 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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* A simple launcher to launch a program as if it was launched by inetd. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.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 <unistd.h> |
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#include <dirent.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <ctype.h> |
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#include "jni.h" |
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#define CHECK(X) if ((X) == 0) {printf("JNI init error line %d\n", __LINE__); _exit(1);} |
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static jclass unixSocketClass; |
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static jmethodID unixSocketCtor; |
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/* |
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* Throws the exception of the given class name and detail message |
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*/ |
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static void ThrowException(JNIEnv *env, const char *name, const char *msg) { |
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jclass cls = (*env)->FindClass(env, name); |
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if (cls != NULL) { |
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(*env)->ThrowNew(env, cls, msg); |
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} |
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} |
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/* |
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* Convert a jstring to an ISO 8859_1 encoded C string |
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*/ |
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static char* getString8859_1Chars(JNIEnv *env, jstring jstr) { |
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int i; |
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char *result; |
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jint len = (*env)->GetStringLength(env, jstr); |
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const jchar *str = (*env)->GetStringCritical(env, jstr, 0); |
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if (str == 0) { |
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return NULL; |
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} |
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result = (char*)malloc(len+1); |
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if (result == 0) { |
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(*env)->ReleaseStringCritical(env, jstr, str); |
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ThrowException(env, "java/lang/OutOfMemoryError", NULL); |
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return NULL; |
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} |
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for (i=0; i<len; i++) { |
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jchar unicode = str[i]; |
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if (unicode <= 0x00ff) |
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result[i] = unicode; |
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else |
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result[i] = '?'; |
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} |
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result[len] = 0; |
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(*env)->ReleaseStringCritical(env, jstr, str); |
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return result; |
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} |
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/* |
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* Class: Launcher |
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* Method: launch0 |
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* Signature: ([Ljava/lang/String;I)V |
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*/ |
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JNIEXPORT void JNICALL Java_Launcher_launch0 |
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(JNIEnv *env, jclass cls, jobjectArray cmdarray, jint serviceFd) |
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{ |
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pid_t pid; |
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DIR* dp; |
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struct dirent* dirp; |
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int thisFd; |
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char** cmdv; |
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int i, cmdlen; |
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/* |
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105 |
* Argument 0 of the command array is the program name. |
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106 |
* Here we just extract the program name and any arguments into |
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107 |
* a command array suitable for use with execvp. |
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108 |
*/ |
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109 |
cmdlen = (*env)->GetArrayLength(env, cmdarray); |
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|
110 |
if (cmdlen == 0) { |
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|
111 |
ThrowException(env, "java/lang/IllegalArgumentException", |
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112 |
"command array must at least include the program name"); |
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113 |
return; |
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114 |
} |
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115 |
cmdv = (char **)malloc((cmdlen + 1) * sizeof(char *)); |
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116 |
if (cmdv == NULL) { |
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117 |
ThrowException(env, "java/lang/OutOfMemoryError", NULL); |
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118 |
return; |
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119 |
} |
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120 |
|
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121 |
for (i=0; i<cmdlen; i++) { |
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122 |
jstring str = (*env)->GetObjectArrayElement(env, cmdarray, i); |
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123 |
cmdv[i] = (char *) getString8859_1Chars(env, str); |
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124 |
if (cmdv[i] == NULL) { |
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125 |
return; |
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126 |
} |
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127 |
} |
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128 |
|
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129 |
/* |
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130 |
* Command array must have NULL as the last entry |
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131 |
*/ |
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132 |
cmdv[cmdlen] = NULL; |
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133 |
|
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134 |
/* |
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135 |
* Launch the program. As this isn't a complete inetd or Runtime.exec |
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136 |
* implementation we don't have a reaper to pick up child exit status. |
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|
137 |
*/ |
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|
138 |
#ifdef __solaris__ |
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139 |
pid = fork1(); |
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140 |
#else |
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|
141 |
pid = fork(); |
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|
142 |
#endif |
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|
143 |
if (pid != 0) { |
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144 |
if (pid < 0) { |
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|
145 |
ThrowException(env, "java/io/IOException", "fork failed"); |
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146 |
} |
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147 |
return; |
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148 |
} |
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|
149 |
|
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150 |
/* |
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|
151 |
* We need to close all file descriptors except for serviceFd. To |
58295
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152 |
* get the list of open file descriptos we read through /proc/self/fd (/dev/fd) |
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153 |
* but to open this requires a file descriptor. We could use a specific |
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154 |
* file descriptor and fdopendir but Linux doesn't seem to support |
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|
155 |
* fdopendir. Instead we use opendir and make an assumption on the |
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|
156 |
* file descriptor that is used (by opening & closing a file). |
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|
157 |
*/ |
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158 |
thisFd = open("/dev/fd", O_RDONLY); |
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|
159 |
if (thisFd < 0) { |
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|
160 |
_exit(-1); |
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|
161 |
} |
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|
162 |
|
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|
163 |
if ((dp = fdopendir(thisFd)) == NULL) { |
49128
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|
164 |
_exit(-1); |
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|
165 |
} |
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|
166 |
|
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|
167 |
while ((dirp = readdir(dp)) != NULL) { |
97288886180c
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|
168 |
if (isdigit(dirp->d_name[0])) { |
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|
169 |
int fd = strtol(dirp->d_name, NULL, 10); |
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|
170 |
if (fd != serviceFd && fd != thisFd) { |
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|
171 |
close(fd); |
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|
172 |
} |
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|
173 |
} |
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|
174 |
} |
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|
175 |
closedir(dp); |
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|
176 |
|
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|
177 |
/* |
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|
178 |
* At this point all file descriptors are closed except for |
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|
179 |
* serviceFd. We not dup 0,1,2 to this file descriptor and |
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|
180 |
* close serviceFd. This should leave us with only 0,1,2 |
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|
181 |
* open and all connected to the same socket. |
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|
182 |
*/ |
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|
183 |
dup2(serviceFd, STDIN_FILENO); |
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|
184 |
dup2(serviceFd, STDOUT_FILENO); |
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|
185 |
dup2(serviceFd, STDERR_FILENO); |
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|
186 |
close(serviceFd); |
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|
187 |
|
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|
188 |
execvp(cmdv[0], cmdv); |
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189 |
_exit(-1); |
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|
190 |
} |
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|
191 |
|
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|
192 |
JNIEXPORT void JNICALL Java_UnixDomainSocket_init(JNIEnv *env, jclass cls) { |
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193 |
CHECK(unixSocketClass = (*env)->FindClass(env, "UnixDomainSocket")); |
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194 |
CHECK(unixSocketClass = (*env)->NewGlobalRef(env, unixSocketClass)); |
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195 |
CHECK(unixSocketCtor = (*env)->GetMethodID(env, unixSocketClass, "<init>", "(I)V")); |
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|
196 |
} |
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|
197 |
|
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|
198 |
/* |
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|
199 |
* Class: UnixDomainSocket |
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|
200 |
* Method: socketpair |
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|
201 |
* Signature: ()[LUnixDomainSocket |
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|
202 |
*/ |
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|
203 |
JNIEXPORT jobjectArray JNICALL Java_UnixDomainSocket_socketpair |
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|
204 |
(JNIEnv *env, jclass cls) |
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|
205 |
{ |
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|
206 |
int fds[2]; |
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|
207 |
jobject socket; |
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|
208 |
jobjectArray result = (*env)->NewObjectArray(env, 2, unixSocketClass, 0); |
dbbf46b13d52
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|
209 |
if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) { |
dbbf46b13d52
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|
210 |
perror("socketpair"); |
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|
211 |
return result; |
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} |
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socket = (*env)->NewObject(env, unixSocketClass, unixSocketCtor, fds[0]); |
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(*env)->SetObjectArrayElement(env, result, 0, socket); |
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socket = (*env)->NewObject(env, unixSocketClass, unixSocketCtor, fds[1]); |
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(*env)->SetObjectArrayElement(env, result, 1, socket); |
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return result; |
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} |
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|
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JNIEXPORT jint JNICALL Java_UnixDomainSocket_create |
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(JNIEnv *env, jclass cls) |
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{ |
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int sock = socket(AF_UNIX, SOCK_STREAM, 0); |
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if (sock == -1) { |
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ThrowException(env, "java/io/IOException", "socket create error"); |
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} |
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return sock; |
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} |
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|
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JNIEXPORT void JNICALL Java_UnixDomainSocket_bind0 |
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(JNIEnv *env, jclass cls, jint sock, jstring name) |
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{ |
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struct sockaddr_un addr; |
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const char *nameUtf = (*env)->GetStringUTFChars(env, name, NULL); |
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int ret = -1; |
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unlink(nameUtf); |
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memset(&addr, 0, sizeof(addr)); |
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addr.sun_family = AF_UNIX; |
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strncpy(addr.sun_path, nameUtf, strlen(nameUtf)); |
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ret = bind(sock, (const struct sockaddr*)&addr, sizeof(addr)); |
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if (ret == -1) { |
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ThrowException(env, "java/io/IOException", "socket bind error"); |
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} |
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ret = listen(sock, 5); |
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if (ret == -1) { |
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ThrowException(env, "java/io/IOException", "socket bind error"); |
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} |
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(*env)->ReleaseStringUTFChars(env, name, nameUtf); |
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} |
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|
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JNIEXPORT jint JNICALL Java_UnixDomainSocket_accept0 |
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(JNIEnv *env, jclass cls, jint sock) |
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{ |
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struct sockaddr_storage addr; |
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socklen_t len = sizeof(addr); |
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int ret = accept(sock, (struct sockaddr *)&addr, &len); |
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if (ret == -1) |
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ThrowException(env, "java/io/IOException", "socket accept error"); |
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return ret; |
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260 |
} |
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261 |
|
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JNIEXPORT void JNICALL Java_UnixDomainSocket_connect0 |
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(JNIEnv *env, jclass cls, jint fd, jstring name) |
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{ |
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struct sockaddr_un addr; |
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const char *nameUtf = (*env)->GetStringUTFChars(env, name, NULL); |
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int ret = -1; |
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memset(&addr, 0, sizeof(addr)); |
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addr.sun_family = AF_UNIX; |
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strncpy(addr.sun_path, nameUtf, strlen(nameUtf)); |
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ret = connect(fd, (const struct sockaddr*)&addr, sizeof(addr)); |
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if (ret == -1) { |
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ThrowException(env, "java/io/IOException", "socket connect error"); |
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} |
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(*env)->ReleaseStringUTFChars(env, name, nameUtf); |
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} |
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277 |
|
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|
278 |
|
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JNIEXPORT jint JNICALL Java_UnixDomainSocket_read0 |
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(JNIEnv *env, jclass cls, jint fd) |
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{ |
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282 |
int ret; |
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283 |
unsigned char res; |
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ret = read(fd, &res, 1); |
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285 |
if (ret == 0) |
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|
286 |
return -1; /* EOF */ |
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|
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else if (ret < 0) { |
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ThrowException(env, "java/io/IOException", "read error"); |
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return -1; |
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290 |
} |
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291 |
return res; |
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292 |
} |
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293 |
|
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294 |
JNIEXPORT void JNICALL Java_UnixDomainSocket_write0 |
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(JNIEnv *env, jclass cls, jint fd, jint byte) |
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296 |
{ |
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297 |
int ret; |
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298 |
unsigned char w = (unsigned char)byte; |
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ret = write(fd, &w, 1); |
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|
300 |
if (ret < 0) { |
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301 |
ThrowException(env, "java/io/IOException", "write error"); |
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302 |
} |
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|
303 |
} |
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304 |
|
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|
305 |
JNIEXPORT void JNICALL Java_UnixDomainSocket_close0 |
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(JNIEnv *env, jclass cls, jint fd, jstring name) |
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{ |
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close(fd); |
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309 |
if (name != NULL) { |
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const char *nameUtf = (*env)->GetStringUTFChars(env, name, NULL); |
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unlink(nameUtf); |
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312 |
(*env)->ReleaseStringUTFChars(env, name, nameUtf); |
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} |
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} |