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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 #include <assert.h>
     26 
     27 static jclass gFileStatusClass;
     28 static jfieldID gFileStatusDevFieldID;
     29 static jfieldID gFileStatusInoFieldID;
     30 static jfieldID gFileStatusModeFieldID;
     31 static jfieldID gFileStatusNlinkFieldID;
     32 static jfieldID gFileStatusUidFieldID;
     33 static jfieldID gFileStatusGidFieldID;
     34 static jfieldID gFileStatusSizeFieldID;
     35 static jfieldID gFileStatusBlksizeFieldID;
     36 static jfieldID gFileStatusBlocksFieldID;
     37 static jfieldID gFileStatusAtimeFieldID;
     38 static jfieldID gFileStatusMtimeFieldID;
     39 static jfieldID gFileStatusCtimeFieldID;
     40 
     41 /*
     42  * Native methods used by
     43  * cts/libs/deviceutil/src/android/cts/util/FileUtils.java
     44  *
     45  * Copied from hidden API: frameworks/base/core/jni/android_FileUtils.cpp
     46  */
     47 
     48 jboolean android_cts_FileUtils_getFileStatus(JNIEnv* env, jobject thiz,
     49         jstring path, jobject fileStatus, jboolean statLinks)
     50 {
     51     const char* pathStr = env->GetStringUTFChars(path, NULL);
     52     jboolean ret = false;
     53     struct stat s;
     54 
     55     int res = statLinks == true ? lstat(pathStr, &s) : stat(pathStr, &s);
     56 
     57     if (res == 0) {
     58         ret = true;
     59         if (fileStatus != NULL) {
     60             env->SetIntField(fileStatus, gFileStatusDevFieldID, s.st_dev);
     61             env->SetIntField(fileStatus, gFileStatusInoFieldID, s.st_ino);
     62             env->SetIntField(fileStatus, gFileStatusModeFieldID, s.st_mode);
     63             env->SetIntField(fileStatus, gFileStatusNlinkFieldID, s.st_nlink);
     64             env->SetIntField(fileStatus, gFileStatusUidFieldID, s.st_uid);
     65             env->SetIntField(fileStatus, gFileStatusGidFieldID, s.st_gid);
     66             env->SetLongField(fileStatus, gFileStatusSizeFieldID, s.st_size);
     67             env->SetIntField(fileStatus, gFileStatusBlksizeFieldID, s.st_blksize);
     68             env->SetLongField(fileStatus, gFileStatusBlocksFieldID, s.st_blocks);
     69             env->SetLongField(fileStatus, gFileStatusAtimeFieldID, s.st_atime);
     70             env->SetLongField(fileStatus, gFileStatusMtimeFieldID, s.st_mtime);
     71             env->SetLongField(fileStatus, gFileStatusCtimeFieldID, s.st_ctime);
     72         }
     73     }
     74 
     75     env->ReleaseStringUTFChars(path, pathStr);
     76 
     77     return ret;
     78 }
     79 
     80 jstring android_cts_FileUtils_getUserName(JNIEnv* env, jobject thiz,
     81         jint uid)
     82 {
     83     struct passwd *pwd = getpwuid(uid);
     84     return env->NewStringUTF(pwd->pw_name);
     85 }
     86 
     87 jstring android_cts_FileUtils_getGroupName(JNIEnv* env, jobject thiz,
     88         jint gid)
     89 {
     90     struct group *grp = getgrgid(gid);
     91     return env->NewStringUTF(grp->gr_name);
     92 }
     93 
     94 jint android_cts_FileUtils_setPermissions(JNIEnv* env, jobject clazz,
     95         jstring file, jint mode)
     96 {
     97     const char *fileStr = env->GetStringUTFChars(file, NULL);
     98     if (fileStr == NULL) {
     99         return -1;
    100     }
    101 
    102     if (strlen(fileStr) <= 0) {
    103         env->ReleaseStringUTFChars(file, fileStr);
    104         return ENOENT;
    105     }
    106 
    107     jint returnValue = chmod(fileStr, mode) == 0 ? 0 : errno;
    108     env->ReleaseStringUTFChars(file, fileStr);
    109     return returnValue;
    110 }
    111 
    112 static JNINativeMethod gMethods[] = {
    113     {  "getFileStatus", "(Ljava/lang/String;Landroid/cts/util/FileUtils$FileStatus;Z)Z",
    114             (void *) android_cts_FileUtils_getFileStatus  },
    115     {  "getUserName", "(I)Ljava/lang/String;",
    116             (void *) android_cts_FileUtils_getUserName  },
    117     {  "getGroupName", "(I)Ljava/lang/String;",
    118             (void *) android_cts_FileUtils_getGroupName  },
    119     {  "setPermissions", "(Ljava/lang/String;I)I",
    120             (void *) android_cts_FileUtils_setPermissions },
    121 };
    122 
    123 int register_android_cts_FileUtils(JNIEnv* env)
    124 {
    125     jclass clazz = env->FindClass("android/cts/util/FileUtils");
    126     assert(clazz != null);
    127 
    128     gFileStatusClass = env->FindClass("android/cts/util/FileUtils$FileStatus");
    129     assert(gFileStatusClass != null);
    130     gFileStatusDevFieldID = env->GetFieldID(gFileStatusClass, "dev", "I");
    131     gFileStatusInoFieldID = env->GetFieldID(gFileStatusClass, "ino", "I");
    132     gFileStatusModeFieldID = env->GetFieldID(gFileStatusClass, "mode", "I");
    133     gFileStatusNlinkFieldID = env->GetFieldID(gFileStatusClass, "nlink", "I");
    134     gFileStatusUidFieldID = env->GetFieldID(gFileStatusClass, "uid", "I");
    135     gFileStatusGidFieldID = env->GetFieldID(gFileStatusClass, "gid", "I");
    136     gFileStatusSizeFieldID = env->GetFieldID(gFileStatusClass, "size", "J");
    137     gFileStatusBlksizeFieldID = env->GetFieldID(gFileStatusClass, "blksize", "I");
    138     gFileStatusBlocksFieldID = env->GetFieldID(gFileStatusClass, "blocks", "J");
    139     gFileStatusAtimeFieldID = env->GetFieldID(gFileStatusClass, "atime", "J");
    140     gFileStatusMtimeFieldID = env->GetFieldID(gFileStatusClass, "mtime", "J");
    141     gFileStatusCtimeFieldID = env->GetFieldID(gFileStatusClass, "ctime", "J");
    142 
    143     return env->RegisterNatives(clazz, gMethods,
    144             sizeof(gMethods) / sizeof(JNINativeMethod));
    145 }
    146