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 #if defined(LIBC_SCCS) && !defined(lint) 37 static char *rcsid = "$OpenBSD: rresvport.c,v 1.5 2000/01/26 03:43:20 deraadt Exp $"; 38 #endif /* LIBC_SCCS and not lint */ 39 40 #include <sys/param.h> 41 #include <sys/socket.h> 42 #include <sys/stat.h> 43 44 #include <netinet/in.h> 45 #include <arpa/inet.h> 46 47 #include <signal.h> 48 #include <fcntl.h> 49 #include <netdb.h> 50 #include <unistd.h> 51 #include <pwd.h> 52 #include <errno.h> 53 #include <stdio.h> 54 #include <ctype.h> 55 #include <string.h> 56 #include <syslog.h> 57 #include <stdlib.h> 58 #include <netgroup.h> 59 60 int 61 rresvport(alport) 62 int *alport; 63 { 64 return rresvport_af(alport, AF_INET); 65 } 66 67 68 int 69 rresvport_af(alport, af) 70 int *alport; 71 int af; 72 { 73 struct sockaddr_storage ss; 74 struct sockaddr *sa; 75 u_int16_t *portp; 76 int s; 77 78 bzero(&ss, sizeof ss); 79 sa = (struct sockaddr *)&ss; 80 81 switch (af) { 82 case AF_INET: 83 sa->sa_len = sizeof(struct sockaddr_in); 84 portp = &((struct sockaddr_in *)sa)->sin_port; 85 break; 86 case AF_INET6: 87 sa->sa_len = sizeof(struct sockaddr_in6); 88 portp = &((struct sockaddr_in6 *)sa)->sin6_port; 89 break; 90 default: 91 errno = EPFNOSUPPORT; 92 return (-1); 93 } 94 sa->sa_family = af; 95 96 s = socket(af, SOCK_STREAM, 0); 97 if (s < 0) 98 return (-1); 99 100 *portp = htons(*alport); 101 if (*alport < IPPORT_RESERVED - 1) { 102 if (bind(s, sa, sa->sa_len) >= 0) 103 return (s); 104 if (errno != EADDRINUSE) { 105 (void)close(s); 106 return (-1); 107 } 108 } 109 110 *portp = 0; 111 sa->sa_family = af; 112 if (bindresvport_sa(s, sa) == -1) { 113 (void)close(s); 114 return (-1); 115 } 116 *alport = ntohs(*portp); 117 return (s); 118 } 119