rpc.subproj/bindresvport.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  27  * unrestricted use provided that this legend is included on all tape
  28  * media and as a part of the software program in whole or part.  Users
  29  * may copy or modify Sun RPC without charge, but are not authorized
  30  * to license or distribute it to anyone else except as part of a product or
  31  * program developed by the user.
  32  *
  33  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  34  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  35  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  36  *
  37  * Sun RPC is provided with no support and without any obligation on the
  38  * part of Sun Microsystems, Inc. to assist in its use, correction,
  39  * modification or enhancement.
  40  *
  41  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  42  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  43  * OR ANY PART THEREOF.
  44  *
  45  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  46  * or profits or other special, indirect and consequential damages, even if
  47  * Sun has been advised of the possibility of such damages.
  48  *
  49  * Sun Microsystems, Inc.
  50  * 2550 Garcia Avenue
  51  * Mountain View, California  94043
  52  */
  53
  54 #if defined(LIBC_SCCS) && !defined(lint)
  55 /*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/
  56 /*static char *sccsid = "from: @(#)bindresvport.c       2.2 88/07/29 4.0 RPCSRC";*/
  57 /*from: OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp */
  58 static char *rcsid = "$FreeBSD: src/lib/libc/rpc/bindresvport.c,v 1.12 2000/01/26 09:02:42 shin Exp $";
  59 #endif
  60
  61 /*
  62  * Copyright (c) 1987 by Sun Microsystems, Inc.
  63  *
  64  * Portions Copyright(C) 1996, Jason Downs.  All rights reserved.
  65  */
  66
  67 #include <string.h>
  68 #include <unistd.h>
  69 #include <sys/types.h>
  70 #include <sys/errno.h>
  71 #include <sys/socket.h>
  72 #include <netinet/in.h>
  73
  74 /*
  75  * Bind a socket to a privileged port for whatever protocol.
  76  */
  77 int
  78 bindresvport_sa(sd, sa)
  79         int sd;
  80         struct sockaddr *sa;
  81 {
  82         int old, error, af;
  83         struct sockaddr_storage myaddr;
  84         struct sockaddr_in *sin;
  85         struct sockaddr_in6 *sin6;
  86         int proto, portrange, portlow;
  87         u_int16_t port;
  88         int salen;
  89
  90         if (sa == NULL) {
  91                 salen = sizeof(myaddr);
  92                 sa = (struct sockaddr *)&myaddr;
  93
  94                 if (getsockname(sd, sa, &salen) == -1)
  95                         return -1;      /* errno is correctly set */
  96
  97                 af = sa->sa_family;
  98                 memset(&myaddr, 0, salen);
  99         } else
 100                 af = sa->sa_family;
 101
 102         if (af == AF_INET) {
 103                 proto = IPPROTO_IP;
 104                 portrange = IP_PORTRANGE;
 105                 portlow = IP_PORTRANGE_LOW;
 106                 sin = (struct sockaddr_in *)sa;
 107                 salen = sizeof(struct sockaddr_in);
 108                 port = sin->sin_port;
 109         } else if (af == AF_INET6) {
 110                 proto = IPPROTO_IPV6;
 111                 portrange = IPV6_PORTRANGE;
 112                 portlow = IPV6_PORTRANGE_LOW;
 113                 sin6 = (struct sockaddr_in6 *)sa;
 114                 salen = sizeof(struct sockaddr_in6);
 115                 port = sin6->sin6_port;
 116         } else {
 117                 errno = EPFNOSUPPORT;
 118                 return (-1);
 119         }
 120         sa->sa_family = af;
 121         sa->sa_len = salen;
 122
 123         if (port == 0) {
 124                 int oldlen = sizeof(old);
 125
 126                 error = getsockopt(sd, proto, portrange, &old, &oldlen);
 127                 if (error < 0)
 128                         return (error);
 129
 130                 error = setsockopt(sd, proto, portrange, &portlow,
 131                     sizeof(portlow));
 132                 if (error < 0)
 133                         return (error);
 134         }
 135
 136         error = bind(sd, sa, salen);
 137
 138         if (port == 0) {
 139                 int saved_errno = errno;
 140
 141                 if (error) {
 142                         if (setsockopt(sd, proto, portrange, &old,
 143                             sizeof(old)) < 0)
 144                                 errno = saved_errno;
 145                         return (error);
 146                 }
 147
 148                 if (sa != (struct sockaddr *)&myaddr) {
 149                         /* Hmm, what did the kernel assign... */
 150                         if (getsockname(sd, sa, &salen) < 0)
 151                                 errno = saved_errno;
 152                         return (error);
 153                 }
 154         }
 155         return (error);
 156 }
 157
 158 /*
 159  * Bind a socket to a privileged IP port
 160  */
 161 int
 162 bindresvport(sd, sin)
 163         int sd;
 164         struct sockaddr_in *sin;
 165 {
 166         return bindresvport_sa(sd, (struct sockaddr *)sin);
 167 }