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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <grp.h>
     18 #include <jni.h>
     19 #include <pwd.h>
     20 #include <stdio.h>
     21 #include <string.h>
     22 #include <sys/errno.h>
     23 #include <sys/types.h>
     24 #include <sys/stat.h>
     25 
     26 static jclass gFileStatusClass;
     27 static jfieldID gFileStatusDevFieldID;
     28 static jfieldID gFileStatusInoFieldID;
     29 static jfieldID gFileStatusModeFieldID;
     30 static jfieldID gFileStatusNlinkFieldID;
     31 static jfieldID gFileStatusUidFieldID;
     32 static jfieldID gFileStatusGidFieldID;
     33 static jfieldID gFileStatusSizeFieldID;
     34 static jfieldID gFileStatusBlksizeFieldID;
     35 static jfieldID gFileStatusBlocksFieldID;
     36 static jfieldID gFileStatusAtimeFieldID;
     37 static jfieldID gFileStatusMtimeFieldID;
     38 static jfieldID gFileStatusCtimeFieldID;
     39 
     40 /*
     41  * Native methods used by
     42  * cts/tests/src/android/os/cts/FileUtils.java
     43  *
     44  * Copied from hidden API: frameworks/base/core/jni/android_os_FileUtils.cpp
     45  */
     46 
     47 jboolean android_os_cts_FileUtils_getFileStatus(JNIEnv* env, jobject thiz,
     48         jstring path, jobject fileStatus, jboolean statLinks)
     49 {
     50     const char* pathStr = env->GetStringUTFChars(path, NULL);
     51     jboolean ret = false;
     52     struct stat s;
     53 
     54     int res = statLinks == true ? lstat(pathStr, &s) : stat(pathStr, &s);
     55 
     56     if (res == 0) {
     57         ret = true;
     58         if (fileStatus != NULL) {
     59             env->SetIntField(fileStatus, gFileStatusDevFieldID, s.st_dev);
     60             env->SetIntField(fileStatus, gFileStatusInoFieldID, s.st_ino);
     61             env->SetIntField(fileStatus, gFileStatusModeFieldID, s.st_mode);
     62             env->SetIntField(fileStatus, gFileStatusNlinkFieldID, s.st_nlink);
     63             env->SetIntField(fileStatus, gFileStatusUidFieldID, s.st_uid);
     64             env->SetIntField(fileStatus, gFileStatusGidFieldID, s.st_gid);
     65             env->SetLongField(fileStatus, gFileStatusSizeFieldID, s.st_size);
     66             env->SetIntField(fileStatus, gFileStatusBlksizeFieldID, s.st_blksize);
     67             env->SetLongField(fileStatus, gFileStatusBlocksFieldID, s.st_blocks);
     68             env->SetLongField(fileStatus, gFileStatusAtimeFieldID, s.st_atime);
     69             env->SetLongField(fileStatus, gFileStatusMtimeFieldID, s.st_mtime);
     70             env->SetLongField(fileStatus, gFileStatusCtimeFieldID, s.st_ctime);
     71         }
     72     }
     73 
     74     env->ReleaseStringUTFChars(path, pathStr);
     75 
     76     return ret;
     77 }
     78 
     79 jstring android_os_cts_FileUtils_getUserName(JNIEnv* env, jobject thiz,
     80         jint uid)
     81 {
     82     struct passwd *pwd = getpwuid(uid);
     83     return env->NewStringUTF(pwd->pw_name);
     84 }
     85 
     86 jstring android_os_cts_FileUtils_getGroupName(JNIEnv* env, jobject thiz,
     87         jint gid)
     88 {
     89     struct group *grp = getgrgid(gid);
     90     return env->NewStringUTF(grp->gr_name);
     91 }
     92 
     93 jint android_os_cts_FileUtils_setPermissions(JNIEnv* env, jobject clazz,
     94         jstring file, jint mode)
     95 {
     96     const char *fileStr = env->GetStringUTFChars(file, NULL);
     97     if (fileStr == NULL) {
     98         return -1;
     99     }
    100 
    101     if (strlen(fileStr) <= 0) {
    102         env->ReleaseStringUTFChars(file, fileStr);
    103         return ENOENT;
    104     }
    105 
    106     jint returnValue = chmod(fileStr, mode) == 0 ? 0 : errno;
    107     env->ReleaseStringUTFChars(file, fileStr);
    108     return returnValue;
    109 }
    110 
    111 static JNINativeMethod gMethods[] = {
    112     {  "getFileStatus", "(Ljava/lang/String;Landroid/os/cts/FileUtils$FileStatus;Z)Z",
    113             (void *) android_os_cts_FileUtils_getFileStatus  },
    114     {  "getUserName", "(I)Ljava/lang/String;",
    115             (void *) android_os_cts_FileUtils_getUserName  },
    116     {  "getGroupName", "(I)Ljava/lang/String;",
    117             (void *) android_os_cts_FileUtils_getGroupName  },
    118     {  "setPermissions", "(Ljava/lang/String;I)I",
    119             (void *) android_os_cts_FileUtils_setPermissions },
    120 };
    121 
    122 int register_android_os_cts_FileUtils(JNIEnv* env)
    123 {
    124     jclass clazz = env->FindClass("android/os/cts/FileUtils");
    125 
    126     gFileStatusClass = env->FindClass("android/os/cts/FileUtils$FileStatus");
    127     gFileStatusDevFieldID = env->GetFieldID(gFileStatusClass, "dev", "I");
    128     gFileStatusInoFieldID = env->GetFieldID(gFileStatusClass, "ino", "I");
    129     gFileStatusModeFieldID = env->GetFieldID(gFileStatusClass, "mode", "I");
    130     gFileStatusNlinkFieldID = env->GetFieldID(gFileStatusClass, "nlink", "I");
    131     gFileStatusUidFieldID = env->GetFieldID(gFileStatusClass, "uid", "I");
    132     gFileStatusGidFieldID = env->GetFieldID(gFileStatusClass, "gid", "I");
    133     gFileStatusSizeFieldID = env->GetFieldID(gFileStatusClass, "size", "J");
    134     gFileStatusBlksizeFieldID = env->GetFieldID(gFileStatusClass, "blksize", "I");
    135     gFileStatusBlocksFieldID = env->GetFieldID(gFileStatusClass, "blocks", "J");
    136     gFileStatusAtimeFieldID = env->GetFieldID(gFileStatusClass, "atime", "J");
    137     gFileStatusMtimeFieldID = env->GetFieldID(gFileStatusClass, "mtime", "J");
    138     gFileStatusCtimeFieldID = env->GetFieldID(gFileStatusClass, "ctime", "J");
    139 
    140     return env->RegisterNatives(clazz, gMethods,
    141             sizeof(gMethods) / sizeof(JNINativeMethod));
    142 }
    143