J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | #include <sys/types.h> |
| 26 | #include <sys/stat.h> |
| 27 | #include <door.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <unistd.h> |
| 30 | #include <signal.h> |
| 31 | #include <string.h> |
| 32 | #include <fcntl.h> |
| 33 | #include <errno.h> |
| 34 | #include <limits.h> |
| 35 | |
| 36 | #include "jni.h" |
| 37 | #include "jni_util.h" |
| 38 | |
| 39 | #include "sun_tools_attach_SolarisVirtualMachine.h" |
| 40 | |
| 41 | #define RESTARTABLE(_cmd, _result) do { \ |
| 42 | do { \ |
| 43 | _result = _cmd; \ |
| 44 | } while((_result == -1) && (errno == EINTR)); \ |
| 45 | } while(0) |
| 46 | |
| 47 | /* |
| 48 | * Class: sun_tools_attach_SolarisVirtualMachine |
| 49 | * Method: open |
| 50 | * Signature: (Ljava/lang/String;)I |
| 51 | */ |
| 52 | JNIEXPORT jint JNICALL Java_sun_tools_attach_SolarisVirtualMachine_open |
| 53 | (JNIEnv *env, jclass cls, jstring path) |
| 54 | { |
| 55 | jboolean isCopy; |
| 56 | const char* p = GetStringPlatformChars(env, path, &isCopy); |
| 57 | if (p == NULL) { |
| 58 | return 0; |
| 59 | } else { |
| 60 | int fd; |
| 61 | int err = 0; |
| 62 | |
| 63 | fd = open(p, O_RDWR); |
| 64 | if (fd == -1) { |
| 65 | err = errno; |
| 66 | } |
| 67 | |
| 68 | if (isCopy) { |
| 69 | JNU_ReleaseStringPlatformChars(env, path, p); |
| 70 | } |
| 71 | |
| 72 | if (fd == -1) { |
| 73 | if (err == ENOENT) { |
| 74 | JNU_ThrowByName(env, "java/io/FileNotFoundException", NULL); |
| 75 | } else { |
| 76 | char* msg = strdup(strerror(err)); |
| 77 | JNU_ThrowIOException(env, msg); |
| 78 | if (msg != NULL) { |
| 79 | free(msg); |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | return fd; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | * Class: sun_tools_attach_SolarisVirtualMachine |
| 89 | * Method: checkPermissions |
| 90 | * Signature: (Ljava/lang/String;)V |
| 91 | */ |
| 92 | JNIEXPORT void JNICALL Java_sun_tools_attach_SolarisVirtualMachine_checkPermissions |
| 93 | (JNIEnv *env, jclass cls, jstring path) |
| 94 | { |
| 95 | jboolean isCopy; |
| 96 | const char* p = GetStringPlatformChars(env, path, &isCopy); |
| 97 | if (p != NULL) { |
| 98 | struct stat64 sb; |
| 99 | uid_t uid, gid; |
| 100 | int res; |
| 101 | |
| 102 | /* |
| 103 | * Check that the path is owned by the effective uid/gid of this |
| 104 | * process. Also check that group/other access is not allowed. |
| 105 | */ |
| 106 | uid = geteuid(); |
| 107 | gid = getegid(); |
| 108 | |
| 109 | res = stat64(p, &sb); |
| 110 | if (res != 0) { |
| 111 | /* save errno */ |
| 112 | res = errno; |
| 113 | } |
| 114 | |
| 115 | /* release p here before we throw an I/O exception */ |
| 116 | if (isCopy) { |
| 117 | JNU_ReleaseStringPlatformChars(env, path, p); |
| 118 | } |
| 119 | |
| 120 | if (res == 0) { |
| 121 | if ( (sb.st_uid != uid) || (sb.st_gid != gid) || |
| 122 | ((sb.st_mode & (S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) != 0) ) { |
| 123 | JNU_ThrowIOException(env, "well-known file is not secure"); |
| 124 | } |
| 125 | } else { |
| 126 | char* msg = strdup(strerror(res)); |
| 127 | JNU_ThrowIOException(env, msg); |
| 128 | if (msg != NULL) { |
| 129 | free(msg); |
| 130 | } |
| 131 | } |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Class: sun_tools_attach_SolarisVirtualMachine |
| 137 | * Method: close |
| 138 | * Signature: (I)V |
| 139 | */ |
| 140 | JNIEXPORT void JNICALL Java_sun_tools_attach_SolarisVirtualMachine_close |
| 141 | (JNIEnv *env, jclass cls, jint fd) |
| 142 | { |
| 143 | int ret; |
| 144 | RESTARTABLE(close(fd), ret); |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Class: sun_tools_attach_SolarisVirtualMachine |
| 149 | * Method: read |
| 150 | * Signature: (I[BI)I |
| 151 | */ |
| 152 | JNIEXPORT jint JNICALL Java_sun_tools_attach_SolarisVirtualMachine_read |
| 153 | (JNIEnv *env, jclass cls, jint fd, jbyteArray ba, jint off, jint baLen) |
| 154 | { |
| 155 | unsigned char buf[128]; |
| 156 | size_t len = sizeof(buf); |
| 157 | ssize_t n; |
| 158 | |
| 159 | size_t remaining = (size_t)(baLen - off); |
| 160 | if (len > remaining) { |
| 161 | len = remaining; |
| 162 | } |
| 163 | |
| 164 | RESTARTABLE(read(fd, buf+off, len), n); |
| 165 | if (n == -1) { |
| 166 | JNU_ThrowIOExceptionWithLastError(env, "read"); |
| 167 | } else { |
| 168 | if (n == 0) { |
| 169 | n = -1; // EOF |
| 170 | } else { |
| 171 | (*env)->SetByteArrayRegion(env, ba, off, (jint)n, (jbyte *)(buf+off)); |
| 172 | } |
| 173 | } |
| 174 | return n; |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Class: sun_tools_attach_SolarisVirtualMachine |
| 179 | * Method: sigquit |
| 180 | * Signature: (I)V |
| 181 | */ |
| 182 | JNIEXPORT void JNICALL Java_sun_tools_attach_SolarisVirtualMachine_sigquit |
| 183 | (JNIEnv *env, jclass cls, jint pid) |
| 184 | { |
| 185 | if (kill((pid_t)pid, SIGQUIT) == -1) { |
| 186 | JNU_ThrowIOExceptionWithLastError(env, "kill"); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * A simple table to translate some known errors into reasonable |
| 192 | * error messages |
| 193 | */ |
| 194 | static struct { |
| 195 | jint err; |
| 196 | const char* msg; |
| 197 | } const error_messages[] = { |
| 198 | { 100, "Bad request" }, |
| 199 | { 101, "Protocol mismatch" }, |
| 200 | { 102, "Resource failure" }, |
| 201 | { 103, "Internal error" }, |
| 202 | { 104, "Permission denied" }, |
| 203 | }; |
| 204 | |
| 205 | /* |
| 206 | * Lookup the given error code and return the appropriate |
| 207 | * message. If not found return NULL. |
| 208 | */ |
| 209 | static const char* translate_error(jint err) { |
| 210 | int table_size = sizeof(error_messages) / sizeof(error_messages[0]); |
| 211 | int i; |
| 212 | |
| 213 | for (i=0; i<table_size; i++) { |
| 214 | if (err == error_messages[i].err) { |
| 215 | return error_messages[i].msg; |
| 216 | } |
| 217 | } |
| 218 | return NULL; |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Current protocol version |
| 223 | */ |
| 224 | static const char* PROTOCOL_VERSION = "1"; |
| 225 | |
| 226 | /* |
| 227 | * Class: sun_tools_attach_SolarisVirtualMachine |
| 228 | * Method: enqueue |
| 229 | * Signature: (JILjava/lang/String;[Ljava/lang/Object;)V |
| 230 | */ |
| 231 | JNIEXPORT jint JNICALL Java_sun_tools_attach_SolarisVirtualMachine_enqueue |
| 232 | (JNIEnv *env, jclass cls, jint fd, jstring cmd, jobjectArray args) |
| 233 | { |
| 234 | jint arg_count, i; |
| 235 | size_t size; |
| 236 | jboolean isCopy; |
| 237 | door_arg_t door_args; |
| 238 | char res_buffer[128]; |
| 239 | jint result = -1; |
| 240 | int rc; |
| 241 | const char* cstr; |
| 242 | char* buf; |
| 243 | |
| 244 | /* |
| 245 | * First we get the command string and create the start of the |
| 246 | * argument string to send to the target VM: |
| 247 | * <ver>\0<cmd>\0 |
| 248 | */ |
| 249 | cstr = JNU_GetStringPlatformChars(env, cmd, &isCopy); |
| 250 | if (cstr == NULL) { |
| 251 | return -1; /* pending exception */ |
| 252 | } |
| 253 | size = strlen(PROTOCOL_VERSION) + strlen(cstr) + 2; |
| 254 | buf = (char*)malloc(size); |
| 255 | if (buf != NULL) { |
| 256 | char* pos = buf; |
| 257 | strcpy(buf, PROTOCOL_VERSION); |
| 258 | pos += strlen(PROTOCOL_VERSION)+1; |
| 259 | strcpy(pos, cstr); |
| 260 | } |
| 261 | if (isCopy) { |
| 262 | JNU_ReleaseStringPlatformChars(env, cmd, cstr); |
| 263 | } |
| 264 | if (buf == NULL) { |
| 265 | JNU_ThrowOutOfMemoryError(env, "malloc failed"); |
| 266 | return -1; |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * Next we iterate over the arguments and extend the buffer |
| 271 | * to include them. |
| 272 | */ |
| 273 | arg_count = (*env)->GetArrayLength(env, args); |
| 274 | |
| 275 | for (i=0; i<arg_count; i++) { |
| 276 | jobject obj = (*env)->GetObjectArrayElement(env, args, i); |
| 277 | if (obj != NULL) { |
| 278 | cstr = JNU_GetStringPlatformChars(env, obj, &isCopy); |
| 279 | if (cstr != NULL) { |
| 280 | size_t len = strlen(cstr); |
| 281 | char* newbuf = (char*)realloc(buf, size+len+1); |
| 282 | if (newbuf != NULL) { |
| 283 | buf = newbuf; |
| 284 | strcpy(buf+size, cstr); |
| 285 | size += len+1; |
| 286 | } |
| 287 | if (isCopy) { |
| 288 | JNU_ReleaseStringPlatformChars(env, obj, cstr); |
| 289 | } |
| 290 | if (newbuf == NULL) { |
| 291 | free(buf); |
| 292 | JNU_ThrowOutOfMemoryError(env, "realloc failed"); |
| 293 | return -1; |
| 294 | } |
| 295 | } |
| 296 | } |
| 297 | if ((*env)->ExceptionOccurred(env)) { |
| 298 | free(buf); |
| 299 | return -1; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | /* |
| 304 | * The arguments to the door function are in 'buf' so we now |
| 305 | * do the door call |
| 306 | */ |
| 307 | door_args.data_ptr = buf; |
| 308 | door_args.data_size = size; |
| 309 | door_args.desc_ptr = NULL; |
| 310 | door_args.desc_num = 0; |
| 311 | door_args.rbuf = (char*)&res_buffer; |
| 312 | door_args.rsize = sizeof(res_buffer); |
| 313 | |
| 314 | RESTARTABLE(door_call(fd, &door_args), rc); |
| 315 | |
| 316 | /* |
| 317 | * door_call failed |
| 318 | */ |
| 319 | if (rc == -1) { |
| 320 | JNU_ThrowIOExceptionWithLastError(env, "door_call"); |
| 321 | } else { |
| 322 | /* |
| 323 | * door_call succeeded but the call didn't return the the expected jint. |
| 324 | */ |
| 325 | if (door_args.data_size < sizeof(jint)) { |
| 326 | JNU_ThrowIOException(env, "Enqueue error - reason unknown as result is truncated!"); |
| 327 | } else { |
| 328 | jint* res = (jint*)(door_args.data_ptr); |
| 329 | if (*res != JNI_OK) { |
| 330 | const char* msg = translate_error(*res); |
| 331 | char buf[255]; |
| 332 | if (msg == NULL) { |
| 333 | sprintf(buf, "Unable to enqueue command to target VM: %d", *res); |
| 334 | } else { |
| 335 | sprintf(buf, "Unable to enqueue command to target VM: %s", msg); |
| 336 | } |
| 337 | JNU_ThrowIOException(env, buf); |
| 338 | } else { |
| 339 | /* |
| 340 | * The door call should return a file descriptor to one end of |
| 341 | * a socket pair |
| 342 | */ |
| 343 | if ((door_args.desc_ptr != NULL) && |
| 344 | (door_args.desc_num == 1) && |
| 345 | (door_args.desc_ptr->d_attributes & DOOR_DESCRIPTOR)) { |
| 346 | result = door_args.desc_ptr->d_data.d_desc.d_descriptor; |
| 347 | } else { |
| 348 | JNU_ThrowIOException(env, "Reply from enqueue missing descriptor!"); |
| 349 | } |
| 350 | } |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | free(buf); |
| 355 | return result; |
| 356 | } |