1 /*
   2  * Copyright (c) 2009, 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 <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  */
  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
  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
  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 }