The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 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 | #define LOG_TAG "Zygote" |
| 18 | |
| 19 | #include <sys/types.h> |
| 20 | #include <unistd.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <utils/misc.h> |
| 23 | #include <errno.h> |
| 24 | #include <sys/select.h> |
| 25 | |
| 26 | #include "jni.h" |
| 27 | #include <JNIHelp.h> |
| 28 | #include "android_runtime/AndroidRuntime.h" |
| 29 | |
| 30 | #ifdef HAVE_ANDROID_OS |
| 31 | #include <linux/capability.h> |
| 32 | #include <linux/prctl.h> |
| 33 | #include <sys/prctl.h> |
| 34 | extern "C" int capget(cap_user_header_t hdrp, cap_user_data_t datap); |
| 35 | extern "C" int capset(cap_user_header_t hdrp, const cap_user_data_t datap); |
| 36 | #endif |
| 37 | |
| 38 | |
| 39 | namespace android { |
| 40 | |
| 41 | /* |
| 42 | * In class com.android.internal.os.ZygoteInit: |
| 43 | * private static native boolean setreuid(int ruid, int euid) |
| 44 | */ |
| 45 | static jint com_android_internal_os_ZygoteInit_setreuid( |
| 46 | JNIEnv* env, jobject clazz, jint ruid, jint euid) |
| 47 | { |
| 48 | int err; |
| 49 | |
| 50 | errno = 0; |
| 51 | err = setreuid(ruid, euid); |
| 52 | |
| 53 | //LOGI("setreuid(%d,%d) err %d errno %d", ruid, euid, err, errno); |
| 54 | |
| 55 | return errno; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * In class com.android.internal.os.ZygoteInit: |
| 60 | * private static native int setregid(int rgid, int egid) |
| 61 | */ |
| 62 | static jint com_android_internal_os_ZygoteInit_setregid( |
| 63 | JNIEnv* env, jobject clazz, jint rgid, jint egid) |
| 64 | { |
| 65 | int err; |
| 66 | |
| 67 | errno = 0; |
| 68 | err = setregid(rgid, egid); |
| 69 | |
| 70 | //LOGI("setregid(%d,%d) err %d errno %d", rgid, egid, err, errno); |
| 71 | |
| 72 | return errno; |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * In class com.android.internal.os.ZygoteInit: |
| 77 | * private static native int setpgid(int rgid, int egid) |
| 78 | */ |
| 79 | static jint com_android_internal_os_ZygoteInit_setpgid( |
| 80 | JNIEnv* env, jobject clazz, jint pid, jint pgid) |
| 81 | { |
| 82 | int err; |
| 83 | |
| 84 | errno = 0; |
| 85 | |
| 86 | err = setpgid(pid, pgid); |
| 87 | |
| 88 | return errno; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * In class com.android.internal.os.ZygoteInit: |
| 93 | * private static native int getpgid(int pid) |
| 94 | */ |
| 95 | static jint com_android_internal_os_ZygoteInit_getpgid( |
| 96 | JNIEnv* env, jobject clazz, jint pid) |
| 97 | { |
| 98 | pid_t ret; |
| 99 | ret = getpgid(pid); |
| 100 | |
| 101 | if (ret < 0) { |
| 102 | jniThrowIOException(env, errno); |
| 103 | } |
| 104 | |
| 105 | return ret; |
| 106 | } |
| 107 | |
| 108 | static void com_android_internal_os_ZygoteInit_reopenStdio(JNIEnv* env, |
| 109 | jobject clazz, jobject in, jobject out, jobject errfd) |
| 110 | { |
| 111 | int fd; |
| 112 | int err; |
| 113 | |
| 114 | fd = jniGetFDFromFileDescriptor(env, in); |
| 115 | |
| 116 | if (env->ExceptionOccurred() != NULL) { |
| 117 | return; |
| 118 | } |
| 119 | |
| 120 | do { |
| 121 | err = dup2(fd, STDIN_FILENO); |
| 122 | } while (err < 0 && errno == EINTR); |
| 123 | |
| 124 | fd = jniGetFDFromFileDescriptor(env, out); |
| 125 | |
| 126 | if (env->ExceptionOccurred() != NULL) { |
| 127 | return; |
| 128 | } |
| 129 | |
| 130 | do { |
| 131 | err = dup2(fd, STDOUT_FILENO); |
| 132 | } while (err < 0 && errno == EINTR); |
| 133 | |
| 134 | fd = jniGetFDFromFileDescriptor(env, errfd); |
| 135 | |
| 136 | if (env->ExceptionOccurred() != NULL) { |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | do { |
| 141 | err = dup2(fd, STDERR_FILENO); |
| 142 | } while (err < 0 && errno == EINTR); |
| 143 | } |
| 144 | |
| 145 | static void com_android_internal_os_ZygoteInit_closeDescriptor(JNIEnv* env, |
| 146 | jobject clazz, jobject descriptor) |
| 147 | { |
| 148 | int fd; |
| 149 | int err; |
| 150 | |
| 151 | fd = jniGetFDFromFileDescriptor(env, descriptor); |
| 152 | |
| 153 | if (env->ExceptionOccurred() != NULL) { |
| 154 | return; |
| 155 | } |
| 156 | |
| 157 | do { |
| 158 | err = close(fd); |
| 159 | } while (err < 0 && errno == EINTR); |
| 160 | |
| 161 | if (err < 0) { |
| 162 | jniThrowIOException(env, errno); |
| 163 | return; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | static void com_android_internal_os_ZygoteInit_setCloseOnExec (JNIEnv *env, |
| 168 | jobject clazz, jobject descriptor, jboolean flag) |
| 169 | { |
| 170 | int fd; |
| 171 | int err; |
| 172 | int fdFlags; |
| 173 | |
| 174 | fd = jniGetFDFromFileDescriptor(env, descriptor); |
| 175 | |
| 176 | if (env->ExceptionOccurred() != NULL) { |
| 177 | return; |
| 178 | } |
| 179 | |
| 180 | fdFlags = fcntl(fd, F_GETFD); |
| 181 | |
| 182 | if (fdFlags < 0) { |
| 183 | jniThrowIOException(env, errno); |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | if (flag) { |
| 188 | fdFlags |= FD_CLOEXEC; |
| 189 | } else { |
| 190 | fdFlags &= ~FD_CLOEXEC; |
| 191 | } |
| 192 | |
| 193 | err = fcntl(fd, F_SETFD, fdFlags); |
| 194 | |
| 195 | if (err < 0) { |
| 196 | jniThrowIOException(env, errno); |
| 197 | return; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | static void com_android_internal_os_ZygoteInit_setCapabilities (JNIEnv *env, |
| 202 | jobject clazz, jlong permitted, jlong effective) |
| 203 | { |
| 204 | #ifdef HAVE_ANDROID_OS |
| 205 | struct __user_cap_header_struct capheader; |
| 206 | struct __user_cap_data_struct capdata; |
| 207 | int err; |
| 208 | |
| 209 | memset (&capheader, 0, sizeof(capheader)); |
| 210 | memset (&capdata, 0, sizeof(capdata)); |
| 211 | |
| 212 | capheader.version = _LINUX_CAPABILITY_VERSION; |
| 213 | capheader.pid = 0; |
| 214 | |
| 215 | // As of this writing, capdata is __u32, but that's expected |
| 216 | // to change... |
| 217 | capdata.effective = effective; |
| 218 | capdata.permitted = permitted; |
| 219 | |
| 220 | err = capset (&capheader, &capdata); |
| 221 | |
| 222 | if (err < 0) { |
| 223 | jniThrowIOException(env, errno); |
| 224 | return; |
| 225 | } |
| 226 | #endif /* HAVE_ANDROID_OS */ |
| 227 | } |
| 228 | |
| 229 | static jlong com_android_internal_os_ZygoteInit_capgetPermitted (JNIEnv *env, |
| 230 | jobject clazz, jint pid) |
| 231 | { |
| 232 | #ifndef HAVE_ANDROID_OS |
| 233 | return (jlong)0; |
| 234 | #else |
| 235 | struct __user_cap_header_struct capheader; |
| 236 | struct __user_cap_data_struct capdata; |
| 237 | int err; |
| 238 | |
| 239 | memset (&capheader, 0, sizeof(capheader)); |
| 240 | memset (&capdata, 0, sizeof(capdata)); |
| 241 | |
| 242 | capheader.version = _LINUX_CAPABILITY_VERSION; |
| 243 | capheader.pid = pid; |
| 244 | |
| 245 | err = capget (&capheader, &capdata); |
| 246 | |
| 247 | if (err < 0) { |
| 248 | jniThrowIOException(env, errno); |
| 249 | return 0; |
| 250 | } |
| 251 | |
| 252 | return (jlong) capdata.permitted; |
| 253 | #endif /* HAVE_ANDROID_OS */ |
| 254 | } |
| 255 | |
| 256 | static jint com_android_internal_os_ZygoteInit_selectReadable ( |
| 257 | JNIEnv *env, jobject clazz, jobjectArray fds) |
| 258 | { |
| 259 | if (fds == NULL) { |
| 260 | jniThrowException(env, "java/lang/NullPointerException", |
| 261 | "fds == null"); |
| 262 | return -1; |
| 263 | } |
| 264 | |
| 265 | jsize length = env->GetArrayLength(fds); |
| 266 | fd_set fdset; |
| 267 | |
| 268 | if (env->ExceptionOccurred() != NULL) { |
| 269 | return -1; |
| 270 | } |
| 271 | |
| 272 | FD_ZERO(&fdset); |
| 273 | |
| 274 | int nfds = 0; |
| 275 | for (jsize i = 0; i < length; i++) { |
| 276 | jobject fdObj = env->GetObjectArrayElement(fds, i); |
| 277 | if (env->ExceptionOccurred() != NULL) { |
| 278 | return -1; |
| 279 | } |
| 280 | if (fdObj == NULL) { |
| 281 | continue; |
| 282 | } |
| 283 | int fd = jniGetFDFromFileDescriptor(env, fdObj); |
| 284 | if (env->ExceptionOccurred() != NULL) { |
| 285 | return -1; |
| 286 | } |
| 287 | |
| 288 | FD_SET(fd, &fdset); |
| 289 | |
| 290 | if (fd >= nfds) { |
| 291 | nfds = fd + 1; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | int err; |
| 296 | do { |
| 297 | err = select (nfds, &fdset, NULL, NULL, NULL); |
| 298 | } while (err < 0 && errno == EINTR); |
| 299 | |
| 300 | if (err < 0) { |
| 301 | jniThrowIOException(env, errno); |
| 302 | return -1; |
| 303 | } |
| 304 | |
| 305 | for (jsize i = 0; i < length; i++) { |
| 306 | jobject fdObj = env->GetObjectArrayElement(fds, i); |
| 307 | if (env->ExceptionOccurred() != NULL) { |
| 308 | return -1; |
| 309 | } |
| 310 | if (fdObj == NULL) { |
| 311 | continue; |
| 312 | } |
| 313 | int fd = jniGetFDFromFileDescriptor(env, fdObj); |
| 314 | if (env->ExceptionOccurred() != NULL) { |
| 315 | return -1; |
| 316 | } |
| 317 | if (FD_ISSET(fd, &fdset)) { |
| 318 | return (jint)i; |
| 319 | } |
| 320 | } |
| 321 | return -1; |
| 322 | } |
| 323 | |
| 324 | static jobject com_android_internal_os_ZygoteInit_createFileDescriptor ( |
| 325 | JNIEnv *env, jobject clazz, jint fd) |
| 326 | { |
| 327 | return jniCreateFileDescriptor(env, fd); |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * JNI registration. |
| 332 | */ |
| 333 | static JNINativeMethod gMethods[] = { |
| 334 | /* name, signature, funcPtr */ |
| 335 | { "setreuid", "(II)I", |
| 336 | (void*) com_android_internal_os_ZygoteInit_setreuid }, |
| 337 | { "setregid", "(II)I", |
| 338 | (void*) com_android_internal_os_ZygoteInit_setregid }, |
| 339 | { "setpgid", "(II)I", |
| 340 | (void *) com_android_internal_os_ZygoteInit_setpgid }, |
| 341 | { "getpgid", "(I)I", |
| 342 | (void *) com_android_internal_os_ZygoteInit_getpgid }, |
| 343 | { "reopenStdio", |
| 344 | "(Ljava/io/FileDescriptor;Ljava/io/FileDescriptor;" |
| 345 | "Ljava/io/FileDescriptor;)V", |
| 346 | (void *) com_android_internal_os_ZygoteInit_reopenStdio}, |
| 347 | { "closeDescriptor", "(Ljava/io/FileDescriptor;)V", |
| 348 | (void *) com_android_internal_os_ZygoteInit_closeDescriptor}, |
| 349 | { "setCloseOnExec", "(Ljava/io/FileDescriptor;Z)V", |
| 350 | (void *) com_android_internal_os_ZygoteInit_setCloseOnExec}, |
| 351 | { "setCapabilities", "(JJ)V", |
| 352 | (void *) com_android_internal_os_ZygoteInit_setCapabilities }, |
| 353 | { "capgetPermitted", "(I)J", |
| 354 | (void *) com_android_internal_os_ZygoteInit_capgetPermitted }, |
| 355 | { "selectReadable", "([Ljava/io/FileDescriptor;)I", |
| 356 | (void *) com_android_internal_os_ZygoteInit_selectReadable }, |
| 357 | { "createFileDescriptor", "(I)Ljava/io/FileDescriptor;", |
| 358 | (void *) com_android_internal_os_ZygoteInit_createFileDescriptor } |
| 359 | }; |
| 360 | int register_com_android_internal_os_ZygoteInit(JNIEnv* env) |
| 361 | { |
| 362 | return AndroidRuntime::registerNativeMethods(env, |
| 363 | "com/android/internal/os/ZygoteInit", gMethods, NELEM(gMethods)); |
| 364 | } |
| 365 | |
| 366 | }; // namespace android |
| 367 | |