1 /*
   2  * Copyright (c) 2009, 2010, 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   #ifdef AF_INET6
  60     int domain = ipv6_available() ? AF_INET6 : AF_INET;
  61   #else
  62     int domain = AF_INET;
  63   #endif
  64     s = socket(domain, SOCK_STREAM, PROTO_SDP);
  65 #elif defined(__linux__)
  66     /**
  67      * IPv6 not supported by SDP on Linux
  68      */
  69     if (ipv6_available()) {
  70         JNU_ThrowIOException(env, "IPv6 not supported");
  71         return -1;
  72     }
  73     s = socket(AF_INET_SDP, SOCK_STREAM, 0);
  74 #else
  75     /* not supported on other platforms at this time */
  76     s = -1;
  77     errno = EPROTONOSUPPORT;
  78 #endif
  79 
  80     if (s < 0)
  81         JNU_ThrowIOExceptionWithLastError(env, "socket");
  82     return s;
  83 }
  84 
  85 /**
  86  * Creates a SDP socket, returning file descriptor referencing the socket.
  87  */
  88 JNIEXPORT jint JNICALL
  89 Java_sun_net_sdp_SdpSupport_create0(JNIEnv *env, jclass cls)
  90 {
  91     return create(env);
  92 }
  93 
  94 /**
  95  * Converts an existing file descriptor, that references an unbound TCP socket,
  96  * to SDP.
  97  */
  98 JNIEXPORT void JNICALL
  99 Java_sun_net_sdp_SdpSupport_convert0(JNIEnv *env, jclass cls, int fd)
 100 {
 101     int s = create(env);
 102     if (s >= 0) {
 103         socklen_t len;
 104         int arg, res;
 105         struct linger linger;
 106 
 107         /* copy socket options that are relevant to SDP */
 108         len = sizeof(arg);
 109         if (getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, &len) == 0)
 110             setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*)&arg, len);
 111         len = sizeof(arg);
 112         if (getsockopt(fd, SOL_SOCKET, SO_OOBINLINE, (char*)&arg, &len) == 0)
 113             setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (char*)&arg, len);
 114         len = sizeof(linger);
 115         if (getsockopt(fd, SOL_SOCKET, SO_LINGER, (void*)&linger, &len) == 0)
 116             setsockopt(s, SOL_SOCKET, SO_LINGER, (char*)&linger, len);
 117 
 118         RESTARTABLE(dup2(s, fd), res);
 119         if (res < 0)
 120             JNU_ThrowIOExceptionWithLastError(env, "dup2");
 121         RESTARTABLE(close(s), res);
 122         if (res < 0 && !(*env)->ExceptionOccurred(env))
 123             JNU_ThrowIOExceptionWithLastError(env, "close");
 124     }
 125 }