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 /*from: OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp */
  57 static char *rcsid = "$FreeBSD: src/lib/libc/rpc/bindresvport.c,v 1.12 2000/01/26 09:02:42 shin Exp $";
  58 #endif
  59
  60 /*
  61  * Copyright (c) 1987 by Sun Microsystems, Inc.
  62  *
  63  * Portions Copyright(C) 1996, Jason Downs.  All rights reserved.
  64  */
  65
  66 #include <string.h>
  67 #include <unistd.h>
  68 #include <sys/types.h>
  69 #include <sys/errno.h>
  70 #include <sys/socket.h>
  71 #include <netinet/in.h>
  72
  73 /*
  74  * Bind a socket to a privileged port for whatever protocol.
  75  */
  76 int
  77 bindresvport_sa(sd, sa)
  78         int sd;
  79         struct sockaddr *sa;
  80 {
  81         int old, error, af;
  82         struct sockaddr_storage myaddr;
  83         struct sockaddr_in *sin;
  84         struct sockaddr_in6 *sin6;
  85         int proto, portrange, portlow;
  86         u_int16_t port;
  87         u_int32_t salen;
  88
  89         if (sa == NULL) {
  90                 salen = sizeof(myaddr);
  91                 sa = (struct sockaddr *)&myaddr;
  92
  93                 if (getsockname(sd, sa, &salen) == -1)
  94                         return -1;      /* errno is correctly set */
  95
  96                 af = sa->sa_family;
  97                 memset(&myaddr, 0, salen);
  98         } else
  99                 af = sa->sa_family;
 100
 101         if (af == AF_INET) {
 102                 proto = IPPROTO_IP;
 103                 portrange = IP_PORTRANGE;
 104                 portlow = IP_PORTRANGE_LOW;
 105                 sin = (struct sockaddr_in *)sa;
 106                 salen = sizeof(struct sockaddr_in);
 107                 port = sin->sin_port;
 108         } else if (af == AF_INET6) {
 109                 proto = IPPROTO_IPV6;
 110                 portrange = IPV6_PORTRANGE;
 111                 portlow = IPV6_PORTRANGE_LOW;
 112                 sin6 = (struct sockaddr_in6 *)sa;
 113                 salen = sizeof(struct sockaddr_in6);
 114                 port = sin6->sin6_port;
 115         } else {
 116                 errno = EPFNOSUPPORT;
 117                 return (-1);
 118         }
 119         sa->sa_family = af;
 120         sa->sa_len = salen;
 121
 122         if (port == 0) {
 123                 u_int32_t oldlen = sizeof(old);
 124
 125                 error = getsockopt(sd, proto, portrange, &old, &oldlen);
 126                 if (error < 0)
 127                         return (error);
 128
 129                 error = setsockopt(sd, proto, portrange, &portlow,
 130                     sizeof(portlow));
 131                 if (error < 0)
 132                         return (error);
 133         }
 134
 135         error = bind(sd, sa, salen);
 136
 137         if (port == 0) {
 138                 int saved_errno = errno;
 139
 140                 if (error) {
 141                         if (setsockopt(sd, proto, portrange, &old,
 142                             sizeof(old)) < 0)
 143                                 errno = saved_errno;
 144                         return (error);
 145                 }
 146
 147                 if (sa != (struct sockaddr *)&myaddr) {
 148                         /* Hmm, what did the kernel assign... */
 149                         if (getsockname(sd, sa, &salen) < 0)
 150                                 errno = saved_errno;
 151                         return (error);
 152                 }
 153         }
 154         return (error);
 155 }
 156
 157 /*
 158  * Bind a socket to a privileged IP port
 159  */
 160 int
 161 bindresvport(sd, sin)
 162         int sd;
 163         struct sockaddr_in *sin;
 164 {
 165         return bindresvport_sa(sd, (struct sockaddr *)sin);
 166 }