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(__solaris__)
  31   #if !defined(PROTO_SDP)
  32     #define PROTO_SDP       257
  33   #endif
  34 #elif defined(__linux__)
  35   #if !defined(AF_INET_SDP)
  36     #define AF_INET_SDP     27
  37   #endif
  38 #endif
  39 
  40 #include "jni.h"
  41 #include "jni_util.h"
  42 #include "net_util.h"
  43 
  44 #define RESTARTABLE(_cmd, _result) do { \
  45   do { \
  46     _result = _cmd; \
  47   } while((_result == -1) && (errno == EINTR)); \
  48 } while(0)
  49 
  50 
  51 /**
  52  * Creates a SDP socket.
  53  */
  54 static int create(JNIEnv* env)
  55 {
  56     int s;
  57 
  58 #if defined(__solaris__)
  59     int domain = ipv6_available() ? AF_INET6 : AF_INET;
  60     s = socket(domain, SOCK_STREAM, PROTO_SDP);
  61 #elif defined(__linux__)
  62     /**
  63      * IPv6 not supported by SDP on Linux
  64      */
  65     if (ipv6_available()) {
  66         JNU_ThrowIOException(env, "IPv6 not supported");
  67         return -1;
  68     }
  69     s = socket(AF_INET_SDP, SOCK_STREAM, 0);
  70 #else
  71     /* not supported on other platforms at this time */
  72     s = -1;
  73     errno = EPROTONOSUPPORT;
  74 #endif
  75 
  76     if (s < 0)
  77         JNU_ThrowIOExceptionWithLastError(env, "socket");
  78     return s;
  79 }
  80 
  81 /**
  82  * Creates a SDP socket, returning file descriptor referencing the socket.
  83  */
  84 JNIEXPORT jint JNICALL
  85 Java_sun_net_sdp_SdpSupport_create0(JNIEnv *env, jclass cls)
  86 {
  87     return create(env);
  88 }
  89 
  90 /**
  91  * Converts an existing file descriptor, that references an unbound TCP socket,
  92  * to SDP.
  93  */
  94 JNIEXPORT void JNICALL
  95 Java_sun_net_sdp_SdpSupport_convert0(JNIEnv *env, jclass cls, int fd)
  96 {
  97     int s = create(env);
  98     if (s >= 0) {
  99         socklen_t len;
 100         int arg, res;
 101         struct linger linger;
 102 
 103         /* copy socket options that are relevant to SDP */
 104         len = sizeof(arg);
 105         if (getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, &len) == 0)
 106             setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, len);
 107 #ifdef SO_REUSEPORT
 108         len = sizeof(arg);
 109         if (getsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char*)&arg, &len) == 0)
 110             setsockopt(s, SOL_SOCKET, SO_REUSEPORT, (char*)&arg, len);
 111 #endif
 112         len = sizeof(arg);
 113         if (getsockopt(fd, SOL_SOCKET, SO_OOBINLINE, (char*)&arg, &len) == 0)
 114             setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (char*)&arg, len);
 115         len = sizeof(linger);
 116         if (getsockopt(fd, SOL_SOCKET, SO_LINGER, (void*)&linger, &len) == 0)
 117             setsockopt(s, SOL_SOCKET, SO_LINGER, (char*)&linger, len);
 118 
 119         RESTARTABLE(dup2(s, fd), res);
 120         if (res < 0)
 121             JNU_ThrowIOExceptionWithLastError(env, "dup2");
 122         res = close(s);
 123         if (res < 0 && !(*env)->ExceptionOccurred(env))
 124             JNU_ThrowIOExceptionWithLastError(env, "close");
 125     }
 126 }