follow 前篇，為了執行一堆有權限限制的 command，所以寫一個 syscommandd:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <string.h>
#define FDNAME "/data/syscommandfd"
int main(int argc,char *argv[])
{
int sock,msgsock,rval;
struct sockaddr_un server;
char buf[1024];
int runserver=3;
int sysexitcode;
unlink(FDNAME);
sock = socket(AF_UNIX, SOCK_STREAM,0);
if(sock<0)
{
perror("opening stream socket");
exit(1);
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, FDNAME);
if (bind(sock,(struct sockaddr *)&server, sizeof(struct sockaddr_un)))
{
perror("binding stream socket");
exit(1);
}
printf("socket has name:%s\n",server.sun_path);
listen(sock,5);
do
{
msgsock = accept(sock,0,0);
if (msgsock == -1)
perror("accept");
else
do {
bzero(buf,sizeof(buf));
if ((rval = read(msgsock, buf, 1024))<0)
perror("reading stream message");
else if(rval>0)
{
printf("rcv : %s\n",buf);
sysexitcode = system(buf);
printf("sys exit code: %d\n",sysexitcode);
}
} while (rval > 0);
runserver --;
close(msgsock);
} while(runserver);
close(sock);
unlink(FDNAME);
printf("syscommandd..\n");
return 0;
}
Android.mk
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := syscommandd.c
LOCAL_MODULE := syscommandd
LOCAL_CFLAGS += -lpthread -lrt
LOCAL_MODULE_TAGS := tests
include $(BUILD_EXECUTABLE)
測試程式： c :
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
int main(int argc,char *argv[])
{
int sock;
struct sockaddr_un server;
char buf[1024];
if (argc < 3)
{
printf("usage:%s <pathname> <msg-to-server>", argv[0]);
exit(1);
}
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
{
perror("opening stream socket");
exit(1);
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, argv[1]);
if (connect(sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0)
{
close(sock);
perror("connecting stream socket");
exit(1);
}
if (write(sock, argv[2], strlen(argv[2])) < 0)
perror("writing on stream socket");
close(sock);
return 0;
}
Android Code，使用：
public static void writeSocket(String shellcommand) throws IOException {
LocalSocket sender = new LocalSocket();
sender.connect(new LocalSocketAddress("/data/syscommandfd",LocalSocketAddress.Namespace.FILESYSTEM));
sender.getOutputStream().write(shellcommand.getBytes());
sender.getOutputStream().close();
}
執行就：
writeSocket("touch aa");
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