1 /* This file has be modified from the original OpenBSD source */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32 #include "includes.h" 33 34 #ifndef HAVE_BINDRESVPORT_SA 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char *rcsid = "$OpenBSD: bindresvport.c,v 1.13 2000/01/26 03:43:21 deraadt Exp $"; 38 #endif /* LIBC_SCCS and not lint */ 39 40 /* 41 * Copyright (c) 1987 by Sun Microsystems, Inc. 42 * 43 * Portions Copyright(C) 1996, Jason Downs. All rights reserved. 44 */ 45 46 #include "includes.h" 47 48 #define STARTPORT 600 49 #define ENDPORT (IPPORT_RESERVED - 1) 50 #define NPORTS (ENDPORT - STARTPORT + 1) 51 52 /* 53 * Bind a socket to a privileged IP port 54 */ 55 int 56 bindresvport_sa(sd, sa) 57 int sd; 58 struct sockaddr *sa; 59 { 60 int error, af; 61 struct sockaddr_storage myaddr; 62 struct sockaddr_in *sin; 63 struct sockaddr_in6 *sin6; 64 u_int16_t *portp; 65 u_int16_t port; 66 socklen_t salen; 67 int i; 68 69 if (sa == NULL) { 70 memset(&myaddr, 0, sizeof(myaddr)); 71 sa = (struct sockaddr *)&myaddr; 72 73 if (getsockname(sd, sa, &salen) == -1) 74 return -1; /* errno is correctly set */ 75 76 af = sa->sa_family; 77 memset(&myaddr, 0, salen); 78 } else 79 af = sa->sa_family; 80 81 if (af == AF_INET) { 82 /* LINTED */ 83 sin = (struct sockaddr_in *)sa; 84 salen = sizeof(struct sockaddr_in); 85 portp = &sin->sin_port; 86 } else if (af == AF_INET6) { 87 /* LINTED */ 88 sin6 = (struct sockaddr_in6 *)sa; 89 salen = sizeof(struct sockaddr_in6); 90 portp = &sin6->sin6_port; 91 } else { 92 errno = EPFNOSUPPORT; 93 return (-1); 94 } 95 sa->sa_family = af; 96 97 port = ntohs(*portp); 98 if (port == 0) 99 port = (arc4random() % NPORTS) + STARTPORT; 100 101 /* Avoid warning */ 102 error = -1; 103 104 for(i = 0; i < NPORTS; i++) { 105 *portp = htons(port); 106 107 error = bind(sd, sa, salen); 108 109 /* Terminate on success */ 110 if (error == 0) 111 break; 112 113 /* Terminate on errors, except "address already in use" */ 114 if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL))) 115 break; 116 117 port++; 118 if (port > ENDPORT) 119 port = STARTPORT; 120 } 121 122 return (error); 123 } 124 125 #endif /* HAVE_BINDRESVPORT_SA */ 126 127 #pragma ident "%Z%%M% %I% %E% SMI" 128