usr/src/cmd/ssh/libopenbsd-compat/common/rresvport.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1998 Theo de Raadt.  All rights reserved.
   3  * Copyright (c) 1983, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the University of
  17  *      California, Berkeley and its contributors.
  18  *      This product includes software developed by Theo de Raadt.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "includes.h"
  37
  38 #ifndef HAVE_RRESVPORT_AF
  39
  40 #if defined(LIBC_SCCS) && !defined(lint)
  41 static char *rcsid = "$OpenBSD: rresvport.c,v 1.5 2000/01/26 03:43:20 deraadt Exp $";
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 #include "includes.h"
  45
  46 #if 0
  47 int
  48 rresvport(alport)
  49         int *alport;
  50 {
  51         return rresvport_af(alport, AF_INET);
  52 }
  53 #endif
  54
  55 int
  56 rresvport_af(int *alport, sa_family_t af)
  57 {
  58         struct sockaddr_storage ss;
  59         struct sockaddr *sa;
  60         u_int16_t *portp;
  61         int s;
  62         socklen_t salen;
  63
  64         memset(&ss, '\0', sizeof ss);
  65         sa = (struct sockaddr *)&ss;
  66
  67         switch (af) {
  68         case AF_INET:
  69                 salen = sizeof(struct sockaddr_in);
  70                 portp = &((struct sockaddr_in *)sa)->sin_port;
  71                 break;
  72         case AF_INET6:
  73                 salen = sizeof(struct sockaddr_in6);
  74                 portp = &((struct sockaddr_in6 *)sa)->sin6_port;
  75                 break;
  76         default:
  77                 errno = EPFNOSUPPORT;
  78                 return (-1);
  79         }
  80         sa->sa_family = af;
  81
  82         s = socket(af, SOCK_STREAM, 0);
  83         if (s < 0)
  84                 return (-1);
  85
  86         *portp = htons(*alport);
  87         if (*alport < IPPORT_RESERVED - 1) {
  88                 if (bind(s, sa, salen) >= 0)
  89                         return (s);
  90                 if (errno != EADDRINUSE) {
  91                         (void)close(s);
  92                         return (-1);
  93                 }
  94         }
  95
  96         *portp = 0;
  97         sa->sa_family = af;
  98         if (bindresvport_sa(s, sa) == -1) {
  99                 (void)close(s);
 100                 return (-1);
 101         }
 102         *alport = ntohs(*portp);
 103         return (s);
 104 }
 105
 106 #endif /* HAVE_RRESVPORT_AF */
 107
 108 #pragma ident   "%Z%%M% %I%     %E% SMI"