1/*
2 * Copyright (c) 2000, 2016, 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)
36typedef 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
49static jfieldID fd_fdID;        /* java.io.FileDescriptor.fd */
50static jclass isa_class;        /* java.net.InetSocketAddress */
51static jmethodID isa_ctorID;    /*   .InetSocketAddress(InetAddress, int) */
52
53
54JNIEXPORT void JNICALL
55Java_sun_nio_ch_ServerSocketChannelImpl_initIDs(JNIEnv *env, jclass c)
56{
57    jclass cls;
58
59    cls = (*env)->FindClass(env, "java/io/FileDescriptor");
60    CHECK_NULL(cls);
61    fd_fdID = (*env)->GetFieldID(env, cls, "fd", "I");
62    CHECK_NULL(fd_fdID);
63
64    cls = (*env)->FindClass(env, "java/net/InetSocketAddress");
65    CHECK_NULL(cls);
66    isa_class = (*env)->NewGlobalRef(env, cls);
67    if (isa_class == NULL) {
68        JNU_ThrowOutOfMemoryError(env, NULL);
69        return;
70    }
71    isa_ctorID = (*env)->GetMethodID(env, cls, "<init>",
72                                     "(Ljava/net/InetAddress;I)V");
73    CHECK_NULL(isa_ctorID);
74}
75
76JNIEXPORT jint JNICALL
77Java_sun_nio_ch_ServerSocketChannelImpl_accept0(JNIEnv *env, jobject this,
78                                                jobject ssfdo, jobject newfdo,
79                                                jobjectArray isaa)
80{
81    jint ssfd = (*env)->GetIntField(env, ssfdo, fd_fdID);
82    jint newfd;
83    SOCKETADDRESS sa;
84    socklen_t sa_len = sizeof(SOCKETADDRESS);
85    jobject remote_ia = 0;
86    jobject isa;
87    jint remote_port = 0;
88
89    /*
90     * accept connection but ignore ECONNABORTED indicating that
91     * a connection was eagerly accepted but was reset before
92     * accept() was called.
93     */
94    for (;;) {
95        newfd = accept(ssfd, &sa.sa, &sa_len);
96        if (newfd >= 0) {
97            break;
98        }
99        if (errno != ECONNABORTED) {
100            break;
101        }
102        /* ECONNABORTED => restart accept */
103    }
104
105    if (newfd < 0) {
106        if (errno == EAGAIN)
107            return IOS_UNAVAILABLE;
108        if (errno == EINTR)
109            return IOS_INTERRUPTED;
110        JNU_ThrowIOExceptionWithLastError(env, "Accept failed");
111        return IOS_THROWN;
112    }
113
114    (*env)->SetIntField(env, newfdo, fd_fdID, newfd);
115    remote_ia = NET_SockaddrToInetAddress(env, &sa, (int *)&remote_port);
116    CHECK_NULL_RETURN(remote_ia, IOS_THROWN);
117    isa = (*env)->NewObject(env, isa_class, isa_ctorID, remote_ia, remote_port);
118    CHECK_NULL_RETURN(isa, IOS_THROWN);
119    (*env)->SetObjectArrayElement(env, isaa, 0, isa);
120    return 1;
121}
122