70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <netinet/in.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <unistd.h>
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constexpr int START_PORT = 600;
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constexpr int END_PORT = IPPORT_RESERVED;
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constexpr int NUM_PORTS = (END_PORT - START_PORT);
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int bindresvport(int sd, struct sockaddr_in* sin) {
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sockaddr_in sin0;
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if (sin == nullptr) {
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memset(&sin0, 0, sizeof(sin0));
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sin = &sin0;
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sin->sin_family = AF_INET;
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}
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if (sin->sin_family != AF_INET) {
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errno = EPFNOSUPPORT;
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return -1;
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}
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// TODO: thread safety!
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static short port;
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if (port == 0) {
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port = START_PORT + (getpid() % NUM_PORTS);
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}
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for (size_t i = NUM_PORTS; i > 0; i--, port++) {
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if (port == END_PORT) port = START_PORT;
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sin->sin_port = htons(port);
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int rc = TEMP_FAILURE_RETRY(bind(sd, reinterpret_cast<sockaddr*>(sin), sizeof(*sin)));
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if (rc >= 0) return rc;
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}
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return -1;
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}
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const in6_addr in6addr_any = IN6ADDR_ANY_INIT;
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const in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
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