FreeBSD-5.3/usr.sbin/ypbind/yp_ping.c
/*
* Copyright (c) 1996, 1997
* Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* 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
*/
#if 0
#ifndef lint
static char *sccsid = "@(#)from: clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)from: clnt_udp.c 2.2 88/08/01 4.0 RPCSRC";
#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.sbin/ypbind/yp_ping.c,v 1.16 2003/05/03 21:06:41 obrien Exp $");
/*
* clnt_udp.c, Implements a UDP/IP based, client side RPC.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpcsvc/yp.h>
#include <sys/types.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <net/if.h>
#include "yp_ping.h"
struct cu_data {
int cu_fd; /* connections fd */
bool_t cu_closeit; /* opened by library */
struct sockaddr_storage cu_raddr; /* remote address */
int cu_rlen;
struct timeval cu_wait; /* retransmit interval */
struct timeval cu_total; /* total time for the call */
struct rpc_err cu_error;
XDR cu_outxdrs;
u_int cu_xdrpos;
u_int cu_sendsz; /* send size */
char *cu_outbuf;
u_int cu_recvsz; /* recv size */
struct pollfd pfdp;
int cu_async;
char cu_inbuf[1];
};
/*
* pmap_getport.c
* Client interface to pmap rpc service.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
static struct timeval timeout = { 1, 0 };
static struct timeval tottimeout = { 1, 0 };
/*
* Find the mapped port for program,version.
* Calls the pmap service remotely to do the lookup.
* Returns 0 if no map exists.
*/
static u_short
__pmap_getport(struct sockaddr_in *address, u_long program, u_long version,
u_int protocol)
{
u_short port = 0;
int sock = -1;
register CLIENT *client;
struct pmap parms;
address->sin_port = htons(PMAPPORT);
client = clntudp_bufcreate(address, PMAPPROG,
PMAPVERS, timeout, &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
if (client != (CLIENT *)NULL) {
parms.pm_prog = program;
parms.pm_vers = version;
parms.pm_prot = protocol;
parms.pm_port = 0; /* not needed or used */
if (CLNT_CALL(client, PMAPPROC_GETPORT,
(xdrproc_t)xdr_pmap, &parms,
(xdrproc_t)xdr_u_short, &port,
tottimeout) != RPC_SUCCESS){
rpc_createerr.cf_stat = RPC_PMAPFAILURE;
clnt_geterr(client, &rpc_createerr.cf_error);
} else if (port == 0) {
rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
}
CLNT_DESTROY(client);
}
if (sock != -1)
(void)close(sock);
address->sin_port = 0;
return (port);
}
/*
* Transmit to YPPROC_DOMAIN_NONACK, return immediately.
*/
static bool_t *
ypproc_domain_nonack_2_send(domainname *argp, CLIENT *clnt)
{
static bool_t clnt_res;
struct timeval TIMEOUT = { 0, 0 };
memset((char *)&clnt_res, 0, sizeof (clnt_res));
if (clnt_call(clnt, YPPROC_DOMAIN_NONACK,
(xdrproc_t) xdr_domainname, (caddr_t) argp,
(xdrproc_t) xdr_bool, (caddr_t) &clnt_res,
TIMEOUT) != RPC_SUCCESS) {
return (NULL);
}
return (&clnt_res);
}
/*
* Receive response from YPPROC_DOMAIN_NONACK asynchronously.
*/
static bool_t *
ypproc_domain_nonack_2_recv(domainname *argp, CLIENT *clnt)
{
static bool_t clnt_res;
struct timeval TIMEOUT = { 0, 0 };
memset((char *)&clnt_res, 0, sizeof (clnt_res));
if (clnt_call(clnt, YPPROC_DOMAIN_NONACK,
(xdrproc_t) NULL, (caddr_t) argp,
(xdrproc_t) xdr_bool, (caddr_t) &clnt_res,
TIMEOUT) != RPC_SUCCESS) {
return (NULL);
}
return (&clnt_res);
}
/*
* "We have the machine that goes 'ping!'" -- Monty Python
*
* This function blasts packets at the YPPROC_DOMAIN_NONACK procedures
* of the NIS servers listed in restricted_addrs structure.
* Whoever replies the fastest becomes our chosen server.
*
* Note: THIS IS NOT A BROADCAST OPERATION! We could use clnt_broadcast()
* for this, but that has the following problems:
* - We only get the address of the machine that replied in the
* 'eachresult' callback, and on multi-homed machines this can
* lead to confusion.
* - clnt_broadcast() only transmits to local networks, whereas with
* NIS+ you can have a perfectly good server located anywhere on or
* off the local network.
* - clnt_broadcast() blocks for an arbitrary amount of time which the
* caller can't control -- we want to avoid that.
*
* Also note that this has nothing to do with the NIS_PING procedure used
* for replica updates.
*/
struct ping_req {
struct sockaddr_in sin;
u_int32_t xid;
};
int
__yp_ping(struct in_addr *restricted_addrs, int cnt, char *dom, short *port)
{
struct timeval tv = { 5, 0 };
struct ping_req **reqs;
unsigned long i;
int async;
struct sockaddr_in sin, *any = NULL;
int winner = -1;
u_int32_t xid_seed, xid_lookup;
int sock, dontblock = 1;
CLIENT *clnt;
char *foo = dom;
struct cu_data *cu;
int validsrvs = 0;
/* Set up handles. */
reqs = calloc(1, sizeof(struct ping_req *) * cnt);
xid_seed = time(NULL) ^ getpid();
for (i = 0; i < cnt; i++) {
bzero((char *)&sin, sizeof(sin));
sin.sin_family = AF_INET;
bcopy((char *)&restricted_addrs[i],
(char *)&sin.sin_addr, sizeof(struct in_addr));
sin.sin_port = htons(__pmap_getport(&sin, YPPROG,
YPVERS, IPPROTO_UDP));
if (sin.sin_port == 0)
continue;
reqs[i] = calloc(1, sizeof(struct ping_req));
bcopy((char *)&sin, (char *)&reqs[i]->sin, sizeof(sin));
any = &reqs[i]->sin;
reqs[i]->xid = xid_seed;
xid_seed++;
validsrvs++;
}
/* Make sure at least one server was assigned */
if (!validsrvs) {
free(reqs);
return(-1);
}
/* Create RPC handle */
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
clnt = clntudp_create(any, YPPROG, YPVERS, tv, &sock);
if (clnt == NULL) {
close(sock);
for (i = 0; i < cnt; i++)
if (reqs[i] != NULL)
free(reqs[i]);
free(reqs);
return(-1);
}
clnt->cl_auth = authunix_create_default();
cu = (struct cu_data *)clnt->cl_private;
tv.tv_sec = 0;
clnt_control(clnt, CLSET_TIMEOUT, (char *)&tv);
async = TRUE;
clnt_control(clnt, CLSET_ASYNC, (char *)&async);
ioctl(sock, FIONBIO, &dontblock);
/* Transmit */
for (i = 0; i < cnt; i++) {
if (reqs[i] != NULL) {
clnt_control(clnt, CLSET_XID, (char *)&reqs[i]->xid);
bcopy((char *)&reqs[i]->sin, (char *)&cu->cu_raddr,
sizeof(struct sockaddr_in));
ypproc_domain_nonack_2_send(&foo, clnt);
}
}
/* Receive reply */
ypproc_domain_nonack_2_recv(&foo, clnt);
/* Got a winner -- look him up. */
clnt_control(clnt, CLGET_XID, (char *)&xid_lookup);
for (i = 0; i < cnt; i++) {
if (reqs[i] != NULL && reqs[i]->xid == xid_lookup) {
winner = i;
*port = reqs[i]->sin.sin_port;
}
}
/* Shut everything down */
auth_destroy(clnt->cl_auth);
clnt_destroy(clnt);
close(sock);
for (i = 0; i < cnt; i++)
if (reqs[i] != NULL)
free(reqs[i]);
free(reqs);
return(winner);
}