| /* |
| * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2015, 2018, SAP SE. 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_util.h" |
| |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/un.h> |
| #include <errno.h> |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "sun_tools_attach_VirtualMachineImpl.h" |
| |
| #define RESTARTABLE(_cmd, _result) do { \ |
| do { \ |
| _result = _cmd; \ |
| } while((_result == -1) && (errno == EINTR)); \ |
| } while(0) |
| |
| |
| #define ROOT_UID 0 |
| |
| /* |
| * Class: sun_tools_attach_VirtualMachineImpl |
| * Method: socket |
| * Signature: ()I |
| */ |
| JNIEXPORT jint JNICALL Java_sun_tools_attach_VirtualMachineImpl_socket |
| (JNIEnv *env, jclass cls) |
| { |
| int fd = socket(PF_UNIX, SOCK_STREAM, 0); |
| if (fd == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "socket"); |
| } |
| return (jint)fd; |
| } |
| |
| /* |
| * Class: sun_tools_attach_VirtualMachineImpl |
| * Method: connect |
| * Signature: (ILjava/lang/String;)I |
| */ |
| JNIEXPORT void JNICALL Java_sun_tools_attach_VirtualMachineImpl_connect |
| (JNIEnv *env, jclass cls, jint fd, jstring path) |
| { |
| jboolean isCopy; |
| const char* p = GetStringPlatformChars(env, path, &isCopy); |
| if (p != NULL) { |
| struct sockaddr_un addr; |
| int err = 0; |
| |
| memset(&addr, 0, sizeof(addr)); |
| addr.sun_family = AF_UNIX; |
| /* strncpy is safe because addr.sun_path was zero-initialized before. */ |
| strncpy(addr.sun_path, p, sizeof(addr.sun_path) - 1); |
| /* We must call bind with the actual socketaddr length. This is obligatory for AS400. */ |
| if (connect(fd, (struct sockaddr*)&addr, SUN_LEN(&addr)) == -1) { |
| err = errno; |
| } |
| |
| if (isCopy) { |
| JNU_ReleaseStringPlatformChars(env, path, p); |
| } |
| |
| /* |
| * If the connect failed then we throw the appropriate exception |
| * here (can't throw it before releasing the string as can't call |
| * JNI with pending exception) |
| */ |
| if (err != 0) { |
| if (err == ENOENT) { |
| JNU_ThrowByName(env, "java/io/FileNotFoundException", NULL); |
| } else { |
| char* msg = strdup(strerror(err)); |
| JNU_ThrowIOException(env, msg); |
| if (msg != NULL) { |
| free(msg); |
| } |
| } |
| } |
| } |
| } |
| |
| /* |
| * Class: sun_tools_attach_VirtualMachineImpl |
| * Method: sendQuitTo |
| * Signature: (I)V |
| */ |
| JNIEXPORT void JNICALL Java_sun_tools_attach_VirtualMachineImpl_sendQuitTo |
| (JNIEnv *env, jclass cls, jint pid) |
| { |
| if (kill((pid_t)pid, SIGQUIT)) { |
| JNU_ThrowIOExceptionWithLastError(env, "kill"); |
| } |
| } |
| |
| /* |
| * Class: sun_tools_attach_VirtualMachineImpl |
| * Method: checkPermissions |
| * Signature: (Ljava/lang/String;)V |
| */ |
| JNIEXPORT void JNICALL Java_sun_tools_attach_VirtualMachineImpl_checkPermissions |
| (JNIEnv *env, jclass cls, jstring path) |
| { |
| jboolean isCopy; |
| const char* p = GetStringPlatformChars(env, path, &isCopy); |
| if (p != NULL) { |
| struct stat64 sb; |
| uid_t uid, gid; |
| int res; |
| |
| memset(&sb, 0, sizeof(struct stat64)); |
| |
| /* |
| * Check that the path is owned by the effective uid/gid of this |
| * process. Also check that group/other access is not allowed. |
| */ |
| uid = geteuid(); |
| gid = getegid(); |
| |
| res = stat64(p, &sb); |
| if (res != 0) { |
| /* save errno */ |
| res = errno; |
| } |
| |
| if (res == 0) { |
| char msg[100]; |
| jboolean isError = JNI_FALSE; |
| if (sb.st_uid != uid && uid != ROOT_UID) { |
| snprintf(msg, sizeof(msg), |
| "file should be owned by the current user (which is %d) but is owned by %d", uid, sb.st_uid); |
| isError = JNI_TRUE; |
| } else if (sb.st_gid != gid && uid != ROOT_UID) { |
| snprintf(msg, sizeof(msg), |
| "file's group should be the current group (which is %d) but the group is %d", gid, sb.st_gid); |
| isError = JNI_TRUE; |
| } else if ((sb.st_mode & (S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) != 0) { |
| snprintf(msg, sizeof(msg), |
| "file should only be readable and writable by the owner but has 0%03o access", sb.st_mode & 0777); |
| isError = JNI_TRUE; |
| } |
| if (isError) { |
| char buf[256]; |
| snprintf(buf, sizeof(buf), "well-known file %s is not secure: %s", p, msg); |
| JNU_ThrowIOException(env, buf); |
| } |
| } else { |
| char* msg = strdup(strerror(res)); |
| JNU_ThrowIOException(env, msg); |
| if (msg != NULL) { |
| free(msg); |
| } |
| } |
| |
| if (isCopy) { |
| JNU_ReleaseStringPlatformChars(env, path, p); |
| } |
| } |
| } |
| |
| /* |
| * Class: sun_tools_attach_VirtualMachineImpl |
| * Method: close |
| * Signature: (I)V |
| */ |
| JNIEXPORT void JNICALL Java_sun_tools_attach_VirtualMachineImpl_close |
| (JNIEnv *env, jclass cls, jint fd) |
| { |
| int res; |
| shutdown(fd, SHUT_RDWR); |
| RESTARTABLE(close(fd), res); |
| } |
| |
| /* |
| * Class: sun_tools_attach_VirtualMachineImpl |
| * Method: read |
| * Signature: (I[BI)I |
| */ |
| JNIEXPORT jint JNICALL Java_sun_tools_attach_VirtualMachineImpl_read |
| (JNIEnv *env, jclass cls, jint fd, jbyteArray ba, jint off, jint baLen) |
| { |
| unsigned char buf[128]; |
| size_t len = sizeof(buf); |
| ssize_t n; |
| |
| size_t remaining = (size_t)(baLen - off); |
| if (len > remaining) { |
| len = remaining; |
| } |
| |
| RESTARTABLE(read(fd, buf, len), n); |
| if (n == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "read"); |
| } else { |
| if (n == 0) { |
| n = -1; // EOF |
| } else { |
| (*env)->SetByteArrayRegion(env, ba, off, (jint)n, (jbyte *)(buf)); |
| } |
| } |
| return n; |
| } |
| |
| /* |
| * Class: sun_tools_attach_VirtualMachineImpl |
| * Method: write |
| * Signature: (I[B)V |
| */ |
| JNIEXPORT void JNICALL Java_sun_tools_attach_VirtualMachineImpl_write |
| (JNIEnv *env, jclass cls, jint fd, jbyteArray ba, jint off, jint bufLen) |
| { |
| size_t remaining = bufLen; |
| do { |
| unsigned char buf[128]; |
| size_t len = sizeof(buf); |
| int n; |
| |
| if (len > remaining) { |
| len = remaining; |
| } |
| (*env)->GetByteArrayRegion(env, ba, off, len, (jbyte *)buf); |
| |
| RESTARTABLE(write(fd, buf, len), n); |
| if (n > 0) { |
| off += n; |
| remaining -= n; |
| } else { |
| JNU_ThrowIOExceptionWithLastError(env, "write"); |
| return; |
| } |
| |
| } while (remaining > 0); |
| } |