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/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
/*
* Copyright (c) 1987 by Sun Microsystems, Inc.
*/
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
/*
* Bind a socket to a privileged IP port
*/
int
bindresvport (int sd, struct sockaddr_in *sin)
{
static short port;
struct sockaddr_in myaddr;
int i;
#define STARTPORT 600
#define LOWPORT 512
#define ENDPORT (IPPORT_RESERVED - 1)
#define NPORTS (ENDPORT - STARTPORT + 1)
static short startport = STARTPORT;
if (sin == (struct sockaddr_in *) 0)
{
sin = &myaddr;
__bzero (sin, sizeof (*sin));
sin->sin_family = AF_INET;
}
else if (sin->sin_family != AF_INET)
{
__set_errno (EPFNOSUPPORT);
return -1;
}
if (port == 0)
{
port = (__getpid () % NPORTS) + STARTPORT;
}
/* Initialize to make gcc happy. */
int res = -1;
int nports = ENDPORT - startport + 1;
int endport = ENDPORT;
again:
for (i = 0; i < nports; ++i)
{
sin->sin_port = htons (port++);
if (port > endport)
port = startport;
res = __bind (sd, sin, sizeof (struct sockaddr_in));
if (res >= 0 || errno != EADDRINUSE)
break;
}
if (i == nports && startport != LOWPORT)
{
startport = LOWPORT;
endport = STARTPORT - 1;
nports = STARTPORT - LOWPORT;
port = LOWPORT + port % (STARTPORT - LOWPORT);
goto again;
}
return res;
}
libc_hidden_def (bindresvport)
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