1 /*
2  * Copyright (c) 2000, 2018, 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 
49 static jfieldID fd_fdID;        /* java.io.FileDescriptor.fd */
50 static jclass isa_class;        /* java.net.InetSocketAddress */
51 static jmethodID isa_ctorID;    /*   .InetSocketAddress(InetAddress, int) */
52 
53 
54 JNIEXPORT void JNICALL
Java_sun_nio_ch_ServerSocketChannelImpl_initIDs(JNIEnv * env,jclass c)55 Java_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 
76 JNIEXPORT jint JNICALL
Java_sun_nio_ch_ServerSocketChannelImpl_accept0(JNIEnv * env,jobject this,jobject ssfdo,jobject newfdo,jobjectArray isaa)77 Java_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 || errno == EWOULDBLOCK)
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