1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 /*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/ 32 /*static char *sccsid = "from: @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC";*/ 33 static char *rcsid = "$Id: bindresvport.c,v 1.2 1994/12/04 01:13:12 cgd Exp $"; 34 #endif 35 36 /* 37 * Copyright (c) 1987 by Sun Microsystems, Inc. 38 */ 39 40 #include <sys/types.h> 41 #include <sys/errno.h> 42 #include <sys/socket.h> 43 #include <netinet/in.h> 44 45 /* 46 * Bind a socket to a privileged IP port 47 */ 48 bindresvport(sd, sin) 49 int sd; 50 struct sockaddr_in *sin; 51 { 52 int res; 53 static short port; 54 struct sockaddr_in myaddr; 55 int i; 56 57 #define STARTPORT 600 58 #define ENDPORT (IPPORT_RESERVED - 1) 59 #define NPORTS (ENDPORT - STARTPORT + 1) 60 61 if (sin == (struct sockaddr_in *)0) { 62 sin = &myaddr; 63 bzero(sin, sizeof (*sin)); 64 sin->sin_family = AF_INET; 65 } else if (sin->sin_family != AF_INET) { 66 errno = EPFNOSUPPORT; 67 return (-1); 68 } 69 if (port == 0) { 70 port = (getpid() % NPORTS) + STARTPORT; 71 } 72 res = -1; 73 errno = EADDRINUSE; 74 for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) { 75 sin->sin_port = htons(port++); 76 if (port > ENDPORT) { 77 port = STARTPORT; 78 } 79 res = bind(sd, 80 (struct sockaddr *)sin, sizeof(struct sockaddr_in)); 81 } 82 return (res); 83 } 84