| /* |
| * 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> |
| |
| constexprint START_PORT=600; |
| constexprint END_PORT= IPPORT_RESERVED; |
| constexprint 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! |
| staticshort 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; |
