rpc.subproj/bindresvport.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/
  55 /*static char *sccsid = "from: @(#)bindresvport.c       2.2 88/07/29 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: bindresvport.c,v 1.2 1999/10/14 21:56:52 wsanchez Exp $";
  57 #endif
  58
  59 /*
  60  * Copyright (c) 1987 by Sun Microsystems, Inc.
  61  */
  62
  63 #include <sys/types.h>
  64 #include <sys/errno.h>
  65 #include <sys/socket.h>
  66 #include <netinet/in.h>
  67
  68 /*
  69  * Bind a socket to a privileged IP port
  70  */
  71 bindresvport(sd, sin)
  72         int sd;
  73         struct sockaddr_in *sin;
  74 {
  75         int res;
  76         static short port;
  77         struct sockaddr_in myaddr;
  78         extern int errno;
  79         int i;
  80
  81 #define STARTPORT 600
  82 #define ENDPORT (IPPORT_RESERVED - 1)
  83 #define NPORTS  (ENDPORT - STARTPORT + 1)
  84
  85         if (sin == (struct sockaddr_in *)0) {
  86                 sin = &myaddr;
  87                 bzero(sin, sizeof (*sin));
  88                 sin->sin_family = AF_INET;
  89         } else if (sin->sin_family != AF_INET) {
  90                 errno = EPFNOSUPPORT;
  91                 return (-1);
  92         }
  93         if (port == 0) {
  94                 port = (getpid() % NPORTS) + STARTPORT;
  95         }
  96         res = -1;
  97         errno = EADDRINUSE;
  98         for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) {
  99                 sin->sin_port = htons(port++);
 100                 if (port > ENDPORT) {
 101                         port = STARTPORT;
 102                 }
 103                 res = bind(sd,
 104                     (struct sockaddr *)sin, sizeof(struct sockaddr_in));
 105         }
 106         return (res);
 107 }