| /* |
| * 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 <errno.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #define START_PORT 600 |
| #define END_PORT IPPORT_RESERVED |
| #define NUM_PORTS (END_PORT - START_PORT) |
| |
| int bindresvport(int sd, struct sockaddr_in *sin) |
| { |
| static short port; |
| struct sockaddr_in sin0; |
| int nn, ret; |
| |
| if (sin == NULL) { |
| sin = &sin0; |
| memset( sin, 0, sizeof *sin ); |
| sin->sin_family = AF_INET; |
| } else if (sin->sin_family != AF_INET) { |
| errno = EPFNOSUPPORT; |
| return -1; |
| } |
| |
| if (port == 0) { |
| port = START_PORT + (getpid() % NUM_PORTS); |
| } |
| |
| for (nn = NUM_PORTS; nn > 0; nn--, port++) |
| { |
| if (port == END_PORT) |
| port = START_PORT; |
| |
| sin->sin_port = htons(port); |
| do { |
| ret = bind(sd, (struct sockaddr*)sin, sizeof(*sin)); |
| } while (ret < 0 && errno == EINTR); |
| |
| if (!ret) |
| break; |
| } |
| return ret; |
| } |