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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
/*
* XXX This routine should be changed to use
* ND_CHECK_RESERVED_PORT and ND_SET_RESERVED_PORT
* which can be invoked via netdir_options.
*/
#include <stdio.h>
#include <rpc/rpc.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netdb.h>
#include <errno.h>
#include <rpc/nettype.h>
#include <stropts.h>
#include <string.h>
#include <tiuser.h>
#include <unistd.h>
#define STARTPORT 600
#define ENDPORT (IPPORT_RESERVED - 1)
#define NPORTS (ENDPORT - STARTPORT + 1)
/*
* The argument is a client handle for a UDP connection.
* Unbind its transport endpoint from the existing port
* and rebind it to a reserved port.
* On failure, the client handle can be unbound even if it
* was previously bound. Callers should destroy the client
* handle after a failure.
*/
int
__clnt_bindresvport(cl)
CLIENT *cl;
{
int fd;
int res;
short port;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
extern int errno;
/* extern int t_errno; */
struct t_bind *tbind, *tres;
int i;
bool_t ipv6_fl = FALSE;
struct netconfig *nconf;
/* make sure it's a UDP connection */
nconf = getnetconfigent(cl->cl_netid);
if (nconf == NULL)
return (-1);
if ((nconf->nc_semantics != NC_TPI_CLTS) ||
(strcmp(nconf->nc_protofmly, NC_INET) &&
strcmp(nconf->nc_protofmly, NC_INET6)) ||
strcmp(nconf->nc_proto, NC_UDP)) {
freenetconfigent(nconf);
return (0); /* not udp - don't need resv port */
}
if (strcmp(nconf->nc_protofmly, NC_INET6) == 0)
ipv6_fl = TRUE;
freenetconfigent(nconf);
if (!clnt_control(cl, CLGET_FD, (char *)&fd)) {
return (-1);
}
/* If fd is already bound - unbind it */
if (t_getstate(fd) != T_UNBND) {
while ((t_unbind(fd) < 0) && (t_errno == TLOOK)) {
/*
* If there is a message queued to this descriptor,
* remove it.
*/
struct strbuf ctl[1], data[1];
char ctlbuf[sizeof (union T_primitives) + 32];
char databuf[256];
int flags;
ctl->maxlen = sizeof (ctlbuf);
ctl->buf = ctlbuf;
data->maxlen = sizeof (databuf);
data->buf = databuf;
flags = 0;
if (getmsg(fd, ctl, data, &flags) < 0)
return (-1);
}
if (t_getstate(fd) != T_UNBND)
return (-1);
}
tbind = (struct t_bind *)t_alloc(fd, T_BIND, T_ADDR);
if (tbind == NULL) {
if (t_errno == TBADF)
errno = EBADF;
return (-1);
}
tres = (struct t_bind *)t_alloc(fd, T_BIND, T_ADDR);
if (tres == NULL) {
(void) t_free((char *)tbind, T_BIND);
return (-1);
}
(void) memset((char *)tbind->addr.buf, 0, tbind->addr.len);
/* warning: this sockaddr_in is truncated to 8 bytes */
if (ipv6_fl == TRUE) {
sin6 = (struct sockaddr_in6 *)tbind->addr.buf;
sin6->sin6_family = AF_INET6;
} else {
sin = (struct sockaddr_in *)tbind->addr.buf;
sin->sin_family = AF_INET;
}
tbind->qlen = 0;
tbind->addr.len = tbind->addr.maxlen;
/*
* Need to find a reserved port in the interval
* STARTPORT - ENDPORT. Choose a random starting
* place in the interval based on the process pid
* and sequentially search the ports for one
* that is available.
*/
port = (getpid() % NPORTS) + STARTPORT;
for (i = 0; i < NPORTS; i++) {
if (ipv6_fl == TRUE)
sin6->sin6_port = htons(port++);
else
sin->sin_port = htons(port++);
if (port > ENDPORT)
port = STARTPORT;
/*
* Try to bind to the requested address. If
* the call to t_bind succeeds, then we need
* to make sure that the address that we bound
* to was the address that we requested. If it
* was, then we are done. If not, we fake an
* EADDRINUSE error by setting res, t_errno,
* and errno to indicate that a bind failure
* occurred. Otherwise, if the t_bind call
* failed, we check to see whether it makes
* sense to continue trying to t_bind requests.
*/
res = t_bind(fd, tbind, tres);
if (res == 0) {
if (memcmp(tbind->addr.buf, tres->addr.buf,
(int)tres->addr.len) == 0)
break;
(void) t_unbind(fd);
res = -1;
t_errno = TSYSERR;
errno = EADDRINUSE;
} else if (t_errno != TSYSERR || errno != EADDRINUSE) {
if (t_errno == TACCES)
errno = EACCES;
break;
}
}
(void) t_free((char *)tbind, T_BIND);
(void) t_free((char *)tres, T_BIND);
return (res);
}
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