1 /* OPENBSD ORIGINAL: lib/libc/net/rresvport.c */ 2 3 /* 4 * Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved. 5 * Copyright (c) 1983, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "includes.h" 34 35 #ifndef HAVE_RRESVPORT_AF 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char *rcsid = "$OpenBSD: rresvport.c,v 1.6 2003/06/03 02:11:35 deraadt Exp $"; 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include "includes.h" 42 43 #if 0 44 int 45 rresvport(alport) 46 int *alport; 47 { 48 return rresvport_af(alport, AF_INET); 49 } 50 #endif 51 52 int 53 rresvport_af(int *alport, sa_family_t af) 54 { 55 struct sockaddr_storage ss; 56 struct sockaddr *sa; 57 u_int16_t *portp; 58 int s; 59 socklen_t salen; 60 61 memset(&ss, '\0', sizeof ss); 62 sa = (struct sockaddr *)&ss; 63 64 switch (af) { 65 case AF_INET: 66 salen = sizeof(struct sockaddr_in); 67 portp = &((struct sockaddr_in *)sa)->sin_port; 68 break; 69 case AF_INET6: 70 salen = sizeof(struct sockaddr_in6); 71 portp = &((struct sockaddr_in6 *)sa)->sin6_port; 72 break; 73 default: 74 errno = EPFNOSUPPORT; 75 return (-1); 76 } 77 sa->sa_family = af; 78 79 s = socket(af, SOCK_STREAM, 0); 80 if (s < 0) 81 return (-1); 82 83 *portp = htons(*alport); 84 if (*alport < IPPORT_RESERVED - 1) { 85 if (bind(s, sa, salen) >= 0) 86 return (s); 87 if (errno != EADDRINUSE) { 88 (void)close(s); 89 return (-1); 90 } 91 } 92 93 *portp = 0; 94 sa->sa_family = af; 95 if (bindresvport_sa(s, sa) == -1) { 96 (void)close(s); 97 return (-1); 98 } 99 *alport = ntohs(*portp); 100 return (s); 101 } 102 103 #endif /* HAVE_RRESVPORT_AF */ 104