1 /* $OpenBSD: rresvport.c,v 1.9 2005/11/10 10:00:17 espie Exp $ */ 2 /* 3 * Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved. 4 * Copyright (c) 1983, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* OPENBSD ORIGINAL: lib/libc/net/rresvport.c */ 33 34 #include "includes.h" 35 36 #ifndef HAVE_RRESVPORT_AF 37 38 #include <sys/types.h> 39 #include <sys/socket.h> 40 41 #include <netinet/in.h> 42 #include <arpa/inet.h> 43 44 #include <errno.h> 45 #include <stdlib.h> 46 #include <string.h> 47 48 #if 0 49 int 50 rresvport(int *alport) 51 { 52 return rresvport_af(alport, AF_INET); 53 } 54 #endif 55 56 int 57 rresvport_af(int *alport, sa_family_t af) 58 { 59 struct sockaddr_storage ss; 60 struct sockaddr *sa; 61 u_int16_t *portp; 62 int s; 63 socklen_t salen; 64 65 memset(&ss, '\0', sizeof ss); 66 sa = (struct sockaddr *)&ss; 67 68 switch (af) { 69 case AF_INET: 70 salen = sizeof(struct sockaddr_in); 71 portp = &((struct sockaddr_in *)sa)->sin_port; 72 break; 73 case AF_INET6: 74 salen = sizeof(struct sockaddr_in6); 75 portp = &((struct sockaddr_in6 *)sa)->sin6_port; 76 break; 77 default: 78 errno = EPFNOSUPPORT; 79 return (-1); 80 } 81 sa->sa_family = af; 82 83 s = socket(af, SOCK_STREAM, 0); 84 if (s < 0) 85 return (-1); 86 87 *portp = htons(*alport); 88 if (*alport < IPPORT_RESERVED - 1) { 89 if (bind(s, sa, salen) >= 0) 90 return (s); 91 if (errno != EADDRINUSE) { 92 (void)close(s); 93 return (-1); 94 } 95 } 96 97 *portp = 0; 98 sa->sa_family = af; 99 if (bindresvport_sa(s, sa) == -1) { 100 (void)close(s); 101 return (-1); 102 } 103 *alport = ntohs(*portp); 104 return (s); 105 } 106 107 #endif /* HAVE_RRESVPORT_AF */ 108