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/*
* 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.
*
* $Id: yp_ping.c,v 1.2 1997/05/25 18:54:11 wpaul Exp wpaul $
*/
/*
* What follows is a special version of clntudp_call() that has been
* hacked to send requests and receive replies asynchronously. Similar
* magic is used inside rpc.nisd(8) for the special non-blocking,
* non-fork()ing, non-threading callback support.
*/
/*
* 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
*/
#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";*/
static const char rcsid[] = "@(#) $Id: yp_ping.c,v 1.2 1997/05/25 18:54:11 wpaul Exp wpaul $";
#endif
/*
* clnt_udp.c, Implements a UDP/IP based, client side RPC.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <errno.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpcsvc/yp.h>
#include "yp_ping.h"
#ifndef timeradd
#ifndef KERNEL /* use timevaladd/timevalsub in kernel */
/* NetBSD/OpenBSD compatable interfaces */
#define timeradd(tvp, uvp, vvp) \
do { \
(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
if ((vvp)->tv_usec >= 1000000) { \
(vvp)->tv_sec++; \
(vvp)->tv_usec -= 1000000; \
} \
} while (0)
#define timersub(tvp, uvp, vvp) \
do { \
(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
if ((vvp)->tv_usec < 0) { \
(vvp)->tv_sec--; \
(vvp)->tv_usec += 1000000; \
} \
} while (0)
#endif
#endif
/*
* Private data kept per client handle
*/
struct cu_data {
int cu_sock;
bool_t cu_closeit;
struct sockaddr_in cu_raddr;
int cu_rlen;
struct timeval cu_wait;
struct timeval cu_total;
struct rpc_err cu_error;
XDR cu_outxdrs;
u_int cu_xdrpos;
u_int cu_sendsz;
char *cu_outbuf;
u_int cu_recvsz;
char cu_inbuf[1];
};
static enum clnt_stat
clntudp_a_call(cl, proc, xargs, argsp, xresults, resultsp, utimeout)
register CLIENT *cl; /* client handle */
u_long proc; /* procedure number */
xdrproc_t xargs; /* xdr routine for args */
caddr_t argsp; /* pointer to args */
xdrproc_t xresults; /* xdr routine for results */
caddr_t resultsp; /* pointer to results */
struct timeval utimeout; /* seconds to wait before giving up */
{
register struct cu_data *cu = (struct cu_data *)cl->cl_private;
register XDR *xdrs;
register int outlen = 0;
register int inlen;
int fromlen;
fd_set *fds, readfds;
struct sockaddr_in from;
struct rpc_msg reply_msg;
XDR reply_xdrs;
struct timeval time_waited, start, after, tmp1, tmp2, tv;
bool_t ok;
int nrefreshes = 2; /* number of times to refresh cred */
struct timeval timeout;
if (cu->cu_total.tv_usec == -1)
timeout = utimeout; /* use supplied timeout */
else
timeout = cu->cu_total; /* use default timeout */
if (cu->cu_sock + 1 > FD_SETSIZE) {
int bytes = howmany(cu->cu_sock + 1, NFDBITS) * sizeof(fd_mask);
fds = (fd_set *)malloc(bytes);
if (fds == NULL)
return (cu->cu_error.re_status = RPC_CANTSEND);
memset(fds, 0, bytes);
} else {
fds = &readfds;
FD_ZERO(fds);
}
timerclear(&time_waited);
call_again:
xdrs = &(cu->cu_outxdrs);
if (xargs == NULL)
goto get_reply;
xdrs->x_op = XDR_ENCODE;
XDR_SETPOS(xdrs, cu->cu_xdrpos);
/*
* the transaction is the first thing in the out buffer
*/
(*(u_short *)(cu->cu_outbuf))++;
if ((! XDR_PUTLONG(xdrs, (long *)&proc)) ||
(! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
(! (*xargs)(xdrs, argsp))) {
if (fds != &readfds)
free(fds);
return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
}
outlen = (int)XDR_GETPOS(xdrs);
send_again:
if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0,
(struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen) != outlen) {
cu->cu_error.re_errno = errno;
if (fds != &readfds)
free(fds);
return (cu->cu_error.re_status = RPC_CANTSEND);
}
/*
* Hack to provide rpc-based message passing
*/
if (!timerisset(&timeout)) {
if (fds != &readfds)
free(fds);
return (cu->cu_error.re_status = RPC_TIMEDOUT);
}
get_reply:
/*
* sub-optimal code appears here because we have
* some clock time to spare while the packets are in flight.
* (We assume that this is actually only executed once.)
*/
reply_msg.acpted_rply.ar_verf = _null_auth;
reply_msg.acpted_rply.ar_results.where = resultsp;
reply_msg.acpted_rply.ar_results.proc = xresults;
gettimeofday(&start, NULL);
for (;;) {
/* XXX we know the other bits are still clear */
FD_SET(cu->cu_sock, fds);
tv = cu->cu_wait;
switch (select(cu->cu_sock+1, fds, NULL, NULL, &tv)) {
case 0:
timeradd(&time_waited, &cu->cu_wait, &tmp1);
time_waited = tmp1;
if (timercmp(&time_waited, &timeout, <))
goto send_again;
if (fds != &readfds)
free(fds);
return (cu->cu_error.re_status = RPC_TIMEDOUT);
case -1:
if (errno == EINTR) {
gettimeofday(&after, NULL);
timersub(&after, &start, &tmp1);
timeradd(&time_waited, &tmp1, &tmp2);
time_waited = tmp2;
if (timercmp(&time_waited, &timeout, <))
continue;
if (fds != &readfds)
free(fds);
return (cu->cu_error.re_status = RPC_TIMEDOUT);
}
cu->cu_error.re_errno = errno;
if (fds != &readfds)
free(fds);
return (cu->cu_error.re_status = RPC_CANTRECV);
}
do {
fromlen = sizeof(struct sockaddr);
inlen = recvfrom(cu->cu_sock, cu->cu_inbuf,
(int) cu->cu_recvsz, 0,
(struct sockaddr *)&from, &fromlen);
} while (inlen < 0 && errno == EINTR);
if (inlen < 0) {
if (errno == EWOULDBLOCK)
continue;
cu->cu_error.re_errno = errno;
if (fds != &readfds)
free(fds);
return (cu->cu_error.re_status = RPC_CANTRECV);
}
if (inlen < sizeof(u_int32_t))
continue;
#ifdef dont_check_xid
/* see if reply transaction id matches sent id */
if (*((u_int32_t *)(cu->cu_inbuf)) != *((u_int32_t *)(cu->cu_outbuf)))
continue;
#endif
/* we now assume we have the proper reply */
break;
}
/*
* now decode and validate the response
*/
xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)inlen, XDR_DECODE);
ok = xdr_replymsg(&reply_xdrs, &reply_msg);
/* XDR_DESTROY(&reply_xdrs); save a few cycles on noop destroy */
if (ok) {
_seterr_reply(&reply_msg, &(cu->cu_error));
if (cu->cu_error.re_status == RPC_SUCCESS) {
if (! AUTH_VALIDATE(cl->cl_auth,
&reply_msg.acpted_rply.ar_verf)) {
cu->cu_error.re_status = RPC_AUTHERROR;
cu->cu_error.re_why = AUTH_INVALIDRESP;
}
if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
xdrs->x_op = XDR_FREE;
(void)xdr_opaque_auth(xdrs,
&(reply_msg.acpted_rply.ar_verf));
}
} /* end successful completion */
else {
/* maybe our credentials need to be refreshed ... */
if (nrefreshes > 0 && AUTH_REFRESH(cl->cl_auth)) {
nrefreshes--;
goto call_again;
}
} /* end of unsuccessful completion */
} /* end of valid reply message */
else {
cu->cu_error.re_status = RPC_CANTDECODERES;
}
if (fds != &readfds)
free(fds);
return (cu->cu_error.re_status);
}
/*
* 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(address, program, version, protocol)
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, xdr_pmap, &parms,
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;
unsigned long xid;
};
int __yp_ping(restricted_addrs, cnt, dom, port)
struct in_addr *restricted_addrs;
int cnt;
char *dom;
short *port;
{
struct timeval tv = { 5 , 0 };
struct ping_req **reqs;
unsigned long i;
struct sockaddr_in sin, *any;
int winner = -1;
time_t xid_seed, xid_lookup;
int sock, dontblock = 1;
CLIENT *clnt;
char *foo = dom;
struct cu_data *cu;
enum clnt_stat (*oldfunc)();
/* 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++;
}
/* Make sure at least one server was assigned */
if (reqs[0] == NULL) {
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, &tv);
ioctl(sock, FIONBIO, &dontblock);
oldfunc = clnt->cl_ops->cl_call;
clnt->cl_ops->cl_call = clntudp_a_call;
/* Transmit */
for (i = 0; i < cnt; i++) {
if (reqs[i] != NULL) {
/* subtract one; clntudp_call() will increment */
*((u_int32_t *)(cu->cu_outbuf)) = reqs[i]->xid - 1;
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. */
xid_lookup = *((u_int32_t *)(cu->cu_inbuf));
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 */
clnt->cl_ops->cl_call = oldfunc;
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);
}
|