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