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124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#if defined(_ALLBSD_SOURCE)
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#include <sys/sysctl.h>
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#endif
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#include "jni.h"
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#include "net_util.h"
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#include "sun_net_PortConfig.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct portrange {
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int lower;
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int higher;
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};
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static int getPortRange(struct portrange *range)
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{
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#ifdef __linux__
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{
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FILE *f;
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int ret;
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f = fopen("/proc/sys/net/ipv4/ip_local_port_range", "r");
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if (f != NULL) {
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ret = fscanf(f, "%d %d", &range->lower, &range->higher);
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fclose(f);
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return ret == 2 ? 0 : -1;
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}
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return -1;
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}
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#elif defined(__solaris__)
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{
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range->higher = net_getParam("/dev/tcp", "tcp_largest_anon_port");
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range->lower = net_getParam("/dev/tcp", "tcp_smallest_anon_port");
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return 0;
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}
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#elif defined(_ALLBSD_SOURCE)
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{
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int ret;
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size_t size = sizeof(range->lower);
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ret = sysctlbyname(
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"net.inet.ip.portrange.first", &range->lower, &size, 0, 0
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);
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if (ret == -1) {
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return -1;
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}
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size = sizeof(range->higher);
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ret = sysctlbyname(
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"net.inet.ip.portrange.last", &range->higher, &size, 0, 0
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);
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return ret;
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}
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#else
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return -1;
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#endif
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}
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/*
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* Class: sun_net_PortConfig
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* Method: getLower0
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* Signature: ()I
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*/
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JNIEXPORT jint JNICALL Java_sun_net_PortConfig_getLower0
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(JNIEnv *env, jclass clazz)
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{
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struct portrange range;
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if (getPortRange(&range) < 0) {
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return -1;
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}
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return range.lower;
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}
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/*
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* Class: sun_net_PortConfig
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* Method: getUpper0
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* Signature: ()I
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*/
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JNIEXPORT jint JNICALL Java_sun_net_PortConfig_getUpper0
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(JNIEnv *env, jclass clazz)
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{
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struct portrange range;
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if (getPortRange(&range) < 0) {
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return -1;
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}
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return range.higher;
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}
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#ifdef __cplusplus
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}
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#endif
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