80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
static char sccsid[] = "@(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC 1.8 88/02/08 SMI";
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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/*
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* Copyright (c) 1987 by Sun Microsystems, Inc.
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*/
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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/*
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* Bind a socket to a privileged IP port
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*/
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bindresvport(sd, sin)
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int sd;
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struct sockaddr_in *sin;
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{
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int res;
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static short port;
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struct sockaddr_in myaddr;
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extern int errno;
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int i;
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#define STARTPORT 600
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#define ENDPORT (IPPORT_RESERVED - 1)
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#define NPORTS (ENDPORT - STARTPORT + 1)
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if (sin == (struct sockaddr_in *)0) {
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sin = &myaddr;
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bzero(sin, sizeof (*sin));
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sin->sin_family = AF_INET;
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} else if (sin->sin_family != AF_INET) {
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errno = EPFNOSUPPORT;
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return (-1);
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}
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if (port == 0) {
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port = (getpid() % NPORTS) + STARTPORT;
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}
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res = -1;
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errno = EADDRINUSE;
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for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) {
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sin->sin_port = htons(port++);
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if (port > ENDPORT) {
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port = STARTPORT;
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}
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res = bind(sd,
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(struct sockaddr *)sin, sizeof(struct sockaddr_in));
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}
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return (res);
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}
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