# 命令执行
| 类全限定名称 | 方法 | 参数 | 备注 |
|---|---|---|---|
| java.lang.UNIXProcess | forkAndExec | (int mode, byte[] helperpath,byte[] prog,byte[] argBlock, int argc,byte[] envBlock, int envc,byte[] dir,int[] fds,boolean redirectErrorStream) | jdk8以下 |
| java.lang.ProcessImpl | forkAndExec | (int mode, byte[] helperpath,byte[] prog,byte[] argBlock, int argc,byte[] envBlock, int envc,byte[] dir,int[] fds,boolean redirectErrorStream) | jdk9以上 |
| java.lang.ProcessImpl | create | (String cmdString, String envBlock,String dir,long[] stdHandles, ,boolean redirectErrorStream) | windows系统 |
linux & macos
/**
* Creates a process. Depending on the {@code mode} flag, this is done by
* one of the following mechanisms:
* <pre>
* 1 - fork(2) and exec(2)
* 2 - posix_spawn(3P)
* 3-tools - vfork(2) and exec(2)
*
* (4 - clone(2) and exec(2) - obsolete and currently disabled in native code)
* </pre>
* @param fds an array of three file descriptors.
* Indexes 0, 1, and 2 correspond to standard input,
* standard output and standard error, respectively. On
* input, a value of -1 means to create a pipe to connect
* child and parent processes. On output, a value which
* is not -1 is the parent pipe fd corresponding to the
* pipe which has been created. An element of this array
* is -1 on input if and only if it is <em>not</em> -1 on
* output.
* @return the pid of the subprocess
*/
private native int forkAndExec(int mode, byte[] helperpath,
byte[] prog,
byte[] argBlock, int argc,
byte[] envBlock, int envc,
byte[] dir,
int[] fds,
boolean redirectErrorStream)
throws IOException;
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windows
/**
* Create a process using the win32 function CreateProcess.
* The method is synchronized due to MS kb315939 problem.
* All native handles should restore the inherit flag at the end of call.
*
* @param cmdstr the Windows command line
* @param envblock NUL-separated, double-NUL-terminated list of
* environment strings in VAR=VALUE form
* @param dir the working directory of the process, or null if
* inheriting the current directory from the parent process
* @param stdHandles array of windows HANDLEs. Indexes 0, 1, and
* 2 correspond to standard input, standard output and
* standard error, respectively. On input, a value of -1
* means to create a pipe to connect child and parent
* processes. On output, a value which is not -1 is the
* parent pipe handle corresponding to the pipe which has
* been created. An element of this array is -1 on input
* if and only if it is <em>not</em> -1 on output.
* @param redirectErrorStream redirectErrorStream attribute
* @return the native subprocess HANDLE returned by CreateProcess
*/
private static synchronized native long create(String cmdstr,
String envblock,
String dir,
long[] stdHandles,
boolean redirectErrorStream)
throws IOException;
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jrasp 在native层面hook了上面的方法，防止命令执行绕过。
