/*

 * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include <jni.h>

#include "jni_util.h"

#include "com_sun_security_auth_module_UnixSystem.h"

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

/* For POSIX-compliant getpwuid_r on Solaris */

#if defined(__solaris__)

#define _POSIX_PTHREAD_SEMANTICS

#endif

#include <pwd.h>

/*

 * Declare library specific JNI_Onload entry if static build

 */

DEF_STATIC_JNI_OnLoad

JNIEXPORT void JNICALL

Java_com_sun_security_auth_module_UnixSystem_getUnixInfo

                                                (JNIEnv *env, jobject obj) {

    int i;

    char pwd_buf[1024];

    struct passwd *pwd;

    struct passwd resbuf;

    jfieldID userNameID;

    jfieldID userID;

    jfieldID groupID;

    jfieldID supplementaryGroupID;

    jstring jstr;

    jlongArray jgroups;

    jlong *jgroupsAsArray;

    jsize numSuppGroups;

    gid_t *groups;

    jclass cls;

    numSuppGroups = getgroups(0, NULL);

    if (numSuppGroups == -1) {

        return;

    }

    groups = (gid_t *)calloc(numSuppGroups, sizeof(gid_t));

    if (groups == NULL) {

        jclass cls = (*env)->FindClass(env,"java/lang/OutOfMemoryError");

        if (cls != NULL)

            (*env)->ThrowNew(env, cls, NULL);

        return;

    }

    cls = (*env)->GetObjectClass(env, obj);

    memset(pwd_buf, 0, sizeof(pwd_buf));

    if (getpwuid_r(getuid(), &resbuf, pwd_buf, sizeof(pwd_buf), &pwd) == 0 &&

        pwd != NULL &&

        getgroups(numSuppGroups, groups) != -1) {

        userNameID = (*env)->GetFieldID(env, cls, "username", "Ljava/lang/String;");

        if (userNameID == 0)

            goto cleanUpAndReturn;

        userID = (*env)->GetFieldID(env, cls, "uid", "J");

        if (userID == 0)

            goto cleanUpAndReturn;

        groupID = (*env)->GetFieldID(env, cls, "gid", "J");

        if (groupID == 0)

            goto cleanUpAndReturn;

        supplementaryGroupID = (*env)->GetFieldID(env, cls, "groups", "[J");

        if (supplementaryGroupID == 0)

            goto cleanUpAndReturn;

        jstr = (*env)->NewStringUTF(env, pwd->pw_name);

        if (jstr == NULL)

            goto cleanUpAndReturn;

        (*env)->SetObjectField(env, obj, userNameID, jstr);

        (*env)->SetLongField(env, obj, userID, pwd->pw_uid);

        (*env)->SetLongField(env, obj, groupID, pwd->pw_gid);

        jgroups = (*env)->NewLongArray(env, numSuppGroups);

        if (jgroups == NULL)

            goto cleanUpAndReturn;

        jgroupsAsArray = (*env)->GetLongArrayElements(env, jgroups, 0);

        if (jgroupsAsArray == NULL)

            goto cleanUpAndReturn;

        for (i = 0; i < numSuppGroups; i++)

            jgroupsAsArray[i] = groups[i];

        (*env)->ReleaseLongArrayElements(env, jgroups, jgroupsAsArray, 0);

        (*env)->SetObjectField(env, obj, supplementaryGroupID, jgroups);

    }

cleanUpAndReturn:

    free(groups);

    return;

}