1 /*
2 * Copyright (c) 2009, 2020, 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 <sys/types.h>
27 #include <sys/socket.h>
28 #include <errno.h>
29
30 #if defined(__linux__)
31 #if !defined(AF_INET_SDP)
32 #define AF_INET_SDP 27
33 #endif
34 #endif
35
36 #include "jni.h"
37 #include "jni_util.h"
38 #include "net_util.h"
39
40 #define RESTARTABLE(_cmd, _result) do { \
41 do { \
42 _result = _cmd; \
43 } while((_result == -1) && (errno == EINTR)); \
44 } while(0)
45
46
47 /**
48 * Creates a SDP socket.
49 */
create(JNIEnv * env)50 static int create(JNIEnv* env)
51 {
52 int s;
53
54 #if defined(__linux__)
55 /**
56 * IPv6 not supported by SDP on Linux
57 */
58 if (ipv6_available()) {
59 JNU_ThrowIOException(env, "IPv6 not supported");
60 return -1;
61 }
62 s = socket(AF_INET_SDP, SOCK_STREAM, 0);
63 #else
64 /* not supported on other platforms at this time */
65 s = -1;
66 errno = EPROTONOSUPPORT;
67 #endif
68
69 if (s < 0)
70 JNU_ThrowIOExceptionWithLastError(env, "socket");
71 return s;
72 }
73
74 /**
75 * Creates a SDP socket, returning file descriptor referencing the socket.
76 */
77 JNIEXPORT jint JNICALL
Java_sun_net_sdp_SdpSupport_create0(JNIEnv * env,jclass cls)78 Java_sun_net_sdp_SdpSupport_create0(JNIEnv *env, jclass cls)
79 {
80 return create(env);
81 }
82
83 /**
84 * Converts an existing file descriptor, that references an unbound TCP socket,
85 * to SDP.
86 */
87 JNIEXPORT void JNICALL
Java_sun_net_sdp_SdpSupport_convert0(JNIEnv * env,jclass cls,int fd)88 Java_sun_net_sdp_SdpSupport_convert0(JNIEnv *env, jclass cls, int fd)
89 {
90 int s = create(env);
91 if (s >= 0) {
92 socklen_t len;
93 int arg, res;
94 struct linger linger;
95
96 /* copy socket options that are relevant to SDP */
97 len = sizeof(arg);
98 if (getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, &len) == 0)
99 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, len);
100 #ifdef SO_REUSEPORT
101 len = sizeof(arg);
102 if (getsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char*)&arg, &len) == 0)
103 setsockopt(s, SOL_SOCKET, SO_REUSEPORT, (char*)&arg, len);
104 #endif
105 len = sizeof(arg);
106 if (getsockopt(fd, SOL_SOCKET, SO_OOBINLINE, (char*)&arg, &len) == 0)
107 setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (char*)&arg, len);
108 len = sizeof(linger);
109 if (getsockopt(fd, SOL_SOCKET, SO_LINGER, (void*)&linger, &len) == 0)
110 setsockopt(s, SOL_SOCKET, SO_LINGER, (char*)&linger, len);
111
112 RESTARTABLE(dup2(s, fd), res);
113 if (res < 0)
114 JNU_ThrowIOExceptionWithLastError(env, "dup2");
115 res = close(s);
116 if (res < 0 && !(*env)->ExceptionOccurred(env))
117 JNU_ThrowIOExceptionWithLastError(env, "close");
118 }
119 }
120