rpc.subproj/bindresvport.c

   1 /*
   2  * Copyright (c) 1999-2018 Apple 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 "libinfo_common.h"
  67
  68 #include <string.h>
  69 #include <unistd.h>
  70 #include <sys/types.h>
  71 #include <sys/errno.h>
  72 #include <sys/socket.h>
  73 #include <netinet/in.h>
  74
  75 /*
  76  * Bind a socket to a privileged port for whatever protocol.
  77  */
  78 LIBINFO_EXPORT
  79 int
  80 bindresvport_sa(sd, sa)
  81         int sd;
  82         struct sockaddr *sa;
  83 {
  84         int old, error, af;
  85         struct sockaddr_storage myaddr;
  86         struct sockaddr_in *sin;
  87         struct sockaddr_in6 *sin6;
  88         int proto, portrange, portlow;
  89         u_int16_t port;
  90         u_int32_t salen;
  91
  92         if (sa == NULL) {
  93                 salen = sizeof(myaddr);
  94                 sa = (struct sockaddr *)&myaddr;
  95
  96                 if (getsockname(sd, sa, &salen) == -1)
  97                         return -1;      /* errno is correctly set */
  98
  99                 af = sa->sa_family;
 100                 memset(&myaddr, 0, salen);
 101         } else
 102                 af = sa->sa_family;
 103
 104         if (af == AF_INET) {
 105                 proto = IPPROTO_IP;
 106                 portrange = IP_PORTRANGE;
 107                 portlow = IP_PORTRANGE_LOW;
 108                 sin = (struct sockaddr_in *)sa;
 109                 salen = sizeof(struct sockaddr_in);
 110                 port = sin->sin_port;
 111         } else if (af == AF_INET6) {
 112                 proto = IPPROTO_IPV6;
 113                 portrange = IPV6_PORTRANGE;
 114                 portlow = IPV6_PORTRANGE_LOW;
 115                 sin6 = (struct sockaddr_in6 *)sa;
 116                 salen = sizeof(struct sockaddr_in6);
 117                 port = sin6->sin6_port;
 118         } else {
 119                 errno = EPFNOSUPPORT;
 120                 return (-1);
 121         }
 122         sa->sa_family = af;
 123         sa->sa_len = salen;
 124
 125         if (port == 0) {
 126                 u_int32_t oldlen = sizeof(old);
 127
 128                 error = getsockopt(sd, proto, portrange, &old, &oldlen);
 129                 if (error < 0)
 130                         return (error);
 131
 132                 error = setsockopt(sd, proto, portrange, &portlow,
 133                     sizeof(portlow));
 134                 if (error < 0)
 135                         return (error);
 136         }
 137
 138         error = bind(sd, sa, salen);
 139
 140         if (port == 0) {
 141                 int saved_errno = errno;
 142
 143                 if (error) {
 144                         if (setsockopt(sd, proto, portrange, &old,
 145                             sizeof(old)) < 0)
 146                                 errno = saved_errno;
 147                         return (error);
 148                 }
 149
 150                 if (sa != (struct sockaddr *)&myaddr) {
 151                         /* Hmm, what did the kernel assign... */
 152                         if (getsockname(sd, sa, &salen) < 0)
 153                                 errno = saved_errno;
 154                         return (error);
 155                 }
 156         }
 157         return (error);
 158 }
 159
 160 /*
 161  * Bind a socket to a privileged IP port
 162  */
 163 LIBINFO_EXPORT
 164 int
 165 bindresvport(sd, sin)
 166         int sd;
 167         struct sockaddr_in *sin;
 168 {
 169         return bindresvport_sa(sd, (struct sockaddr *)sin);
 170 }