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