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      1 /*
      2  * Copyright (c) 2000, 2008, Oracle and/or its affiliates. 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.  Oracle designates this
      8  * particular file as subject to the "Classpath" exception as provided
      9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     22  * or visit www.oracle.com if you need additional information or have any
     23  * questions.
     24  */
     25 
     26 #include <stdlib.h>
     27 #include <netdb.h>
     28 #include <sys/types.h>
     29 #include <sys/socket.h>
     30 
     31 #if __linux__
     32 #include <netinet/in.h>
     33 #endif
     34 
     35 #if defined(__solaris__) && !defined(_SOCKLEN_T)
     36 typedef size_t socklen_t;       /* New in SunOS 5.7, so need this for 5.6 */
     37 #endif
     38 
     39 #include "jni.h"
     40 #include "jni_util.h"
     41 #include "net_util.h"
     42 #include "jvm.h"
     43 #include "jlong.h"
     44 #include "sun_nio_ch_ServerSocketChannelImpl.h"
     45 #include "nio.h"
     46 #include "nio_util.h"
     47 
     48 #include <nativehelper/JNIHelp.h>
     49 
     50 
     51 #define NATIVE_METHOD(className, functionName, signature) \
     52 { #functionName, signature, (void*)(className ## _ ## functionName) }
     53 
     54 
     55 static jfieldID fd_fdID;        /* java.io.FileDescriptor.fd */
     56 static jclass isa_class;        /* java.net.InetSocketAddress */
     57 static jmethodID isa_ctorID;    /*   .InetSocketAddress(InetAddress, int) */
     58 
     59 
     60 JNIEXPORT void JNICALL
     61 Java_sun_nio_ch_ServerSocketChannelImpl_initIDs(JNIEnv *env, jclass c)
     62 {
     63     jclass cls;
     64 
     65     cls = (*env)->FindClass(env, "java/io/FileDescriptor");
     66     CHECK_NULL(cls);
     67     fd_fdID = (*env)->GetFieldID(env, cls, "descriptor", "I");
     68     CHECK_NULL(fd_fdID);
     69 
     70     cls = (*env)->FindClass(env, "java/net/InetSocketAddress");
     71     CHECK_NULL(cls);
     72     isa_class = (*env)->NewGlobalRef(env, cls);
     73     if (isa_class == NULL) {
     74         JNU_ThrowOutOfMemoryError(env, NULL);
     75         return;
     76     }
     77     isa_ctorID = (*env)->GetMethodID(env, cls, "<init>",
     78                                      "(Ljava/net/InetAddress;I)V");
     79     CHECK_NULL(isa_ctorID);
     80 }
     81 
     82 JNIEXPORT jint JNICALL
     83 Java_sun_nio_ch_ServerSocketChannelImpl_accept0(JNIEnv *env, jobject this,
     84                                                 jobject ssfdo, jobject newfdo,
     85                                                 jobjectArray isaa)
     86 {
     87     jint ssfd = (*env)->GetIntField(env, ssfdo, fd_fdID);
     88     jint newfd;
     89     struct sockaddr *sa;
     90     int alloc_len;
     91     jobject remote_ia = 0;
     92     jobject isa;
     93     jint remote_port;
     94 
     95     NET_AllocSockaddr(&sa, &alloc_len);
     96     if (sa == NULL) {
     97         JNU_ThrowOutOfMemoryError(env, NULL);
     98         return IOS_THROWN;
     99     }
    100 
    101     /*
    102      * accept connection but ignore ECONNABORTED indicating that
    103      * a connection was eagerly accepted but was reset before
    104      * accept() was called.
    105      */
    106     for (;;) {
    107         socklen_t sa_len = alloc_len;
    108         newfd = accept(ssfd, sa, &sa_len);
    109         if (newfd >= 0) {
    110             break;
    111         }
    112         if (errno != ECONNABORTED) {
    113             break;
    114         }
    115         /* ECONNABORTED => restart accept */
    116     }
    117 
    118     if (newfd < 0) {
    119         free((void *)sa);
    120         if (errno == EAGAIN)
    121             return IOS_UNAVAILABLE;
    122         if (errno == EINTR)
    123             return IOS_INTERRUPTED;
    124         JNU_ThrowIOExceptionWithLastError(env, "Accept failed");
    125         return IOS_THROWN;
    126     }
    127 
    128     (*env)->SetIntField(env, newfdo, fd_fdID, newfd);
    129     remote_ia = NET_SockaddrToInetAddress(env, sa, (int *)&remote_port);
    130     free((void *)sa);
    131     CHECK_NULL_RETURN(remote_ia, IOS_THROWN);
    132     isa = (*env)->NewObject(env, isa_class, isa_ctorID, remote_ia, remote_port);
    133     CHECK_NULL_RETURN(isa, IOS_THROWN);
    134     (*env)->SetObjectArrayElement(env, isaa, 0, isa);
    135     return 1;
    136 }
    137 
    138 
    139 
    140 static JNINativeMethod gMethods[] = {
    141   NATIVE_METHOD(Java_sun_nio_ch_ServerSocketChannelImpl, initIDs, "()V"),
    142   NATIVE_METHOD(Java_sun_nio_ch_ServerSocketChannelImpl, accept0,
    143                 "(Ljava/io/FileDescriptor;Ljava/io/FileDescriptor;[Ljava/net/InetSocketAddress;)I"),
    144 };
    145 
    146 void register_sun_nio_ch_ServerSocketChannelImpl(JNIEnv* env) {
    147   jniRegisterNativeMethods(env, "sun/nio/ch/ServerSocketChannelImpl", gMethods, NELEM(gMethods));
    148 }
    149