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/* Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <rpcsvc/nis.h>
#include "nis_intern.h"
/* Private data kept per client handle, from sunrpc/clnt_udp.c */
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];
};
/* The following is the original routine from sunrpc/pm_getport.c.
The only change is the much shorter timeout. */
/*
* pmap_getport.c
* Client interface to pmap rpc service.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
/*
* 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)
{
const struct timeval timeout = {1, 0};
const struct timeval tottimeout = {1, 0};
u_short port = 0;
int socket = -1;
CLIENT *client;
struct pmap parms;
address->sin_port = htons (PMAPPORT);
client = clntudp_bufcreate (address, PMAPPROG, PMAPVERS, timeout, &socket,
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,
(caddr_t) & parms, (xdrproc_t) xdr_u_short,
(caddr_t) & 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);
}
/* (void)close(socket); CLNT_DESTROY already closed it */
address->sin_port = 0;
return port;
}
/* Transmit to NULLPROC, return immediately. */
static void *
nis_null_3_send (void *argp, CLIENT * clnt)
{
static char clnt_res;
struct timeval TIMEOUT = {0, 0};
memset ((char *) &clnt_res, 0, sizeof (clnt_res));
if (clnt_call (clnt, NULLPROC,
(xdrproc_t) xdr_void, (caddr_t) argp,
(xdrproc_t) xdr_void, (caddr_t) & clnt_res,
TIMEOUT) != RPC_SUCCESS)
return NULL;
return (void *) &clnt_res;
}
/* Receive request from NULLPROC asynchronously. */
static void *
nis_null_3_recv (void *argp, CLIENT * clnt)
{
static char clnt_res;
struct timeval TIMEOUT = {0, 0};
memset ((char *) &clnt_res, 0, sizeof (clnt_res));
if (clnt_call (clnt, NULLPROC,
(xdrproc_t) NULL, (caddr_t) argp,
(xdrproc_t) xdr_void, (caddr_t) & clnt_res,
TIMEOUT) != RPC_SUCCESS)
return NULL;
return (void *) &clnt_res;
}
/* This is now the public functions, which should find the fastest server */
struct findserv_req
{
struct sockaddr_in sin;
u_long xid;
u_int server_nr;
u_int server_ep;
};
long
__nis_findfastest (dir_binding * bind)
{
struct timeval TIMEOUT = {5, 0};
struct findserv_req **pings;
struct sockaddr_in sin;
int found = -1;
time_t xid_seed, xid_lookup;
int sock, dontblock = 1;
CLIENT *clnt;
void *foo = NULL;
u_long i, j, pings_count, pings_max;
struct cu_data *cu;
pings_max = bind->server_len * 2; /* Reserve a little bit more memory
for multihomed hosts */
pings_count = 0;
pings = malloc (sizeof (struct findserv_req *) * pings_max);
xid_seed = time (NULL) ^ getpid ();
memset (&sin, '\0', sizeof (sin));
sin.sin_family = AF_INET;
for (i = 0; i < bind->server_len; i++)
for (j = 0; j < bind->server_val[i].ep.ep_len; ++j)
if (strcmp (bind->server_val[i].ep.ep_val[j].family, "inet") == 0)
if (strcmp (bind->server_val[i].ep.ep_val[j].proto, "-") == 0)
{
sin.sin_addr.s_addr =
inetstr2int (bind->server_val[i].ep.ep_val[j].uaddr);
if (sin.sin_addr.s_addr == 0)
continue;
sin.sin_port = htons (__pmap_getport (&sin, NIS_PROG,
NIS_VERSION, IPPROTO_UDP));
if (sin.sin_port == 0)
continue;
if (pings_count >= pings_max)
{
pings_max += 10;
pings = realloc (pings, sizeof (struct findserv_req) *
pings_max);
}
pings[pings_count] = calloc (1, sizeof (struct findserv_req));
memcpy ((char *) &pings[pings_count]->sin, (char *) &sin,
sizeof (sin));
pings[pings_count]->xid = xid_seed;
pings[pings_count]->server_nr = i;
pings[pings_count]->server_ep = j;
++xid_seed;
++pings_count;
}
/* Make sure at least one server was assigned */
if (pings_count == 0)
{
free (pings);
return -1;
}
/* Create RPC handle */
sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
clnt = clntudp_create (&sin, NIS_PROG, NIS_VERSION, TIMEOUT, &sock);
if (clnt == NULL)
{
close (sock);
for (i = 0; i < pings_count; ++i)
free (pings[i]);
free (pings);
return -1;
}
clnt->cl_auth = authunix_create_default ();
cu = (struct cu_data *) clnt->cl_private;
TIMEOUT.tv_sec = 0;
clnt_control (clnt, CLSET_TIMEOUT, (char *) &TIMEOUT);
ioctl (sock, FIONBIO, &dontblock);
/* Send to all servers the NULLPROC */
for (i = 0; i < pings_count; ++i)
{
/* clntudp_call() will increment, subtract one */
*((u_int32_t *) (cu->cu_outbuf)) = pings[i]->xid - 1;
bcopy ((char *) &pings[i]->sin, (char *) &cu->cu_raddr,
sizeof (struct sockaddr_in));
nis_null_3_send (foo, clnt);
}
/* Receive reply */
nis_null_3_recv (foo, clnt);
xid_lookup = *((u_int32_t *) (cu->cu_inbuf));
for (i = 0; i < pings_count; i++)
{
if (pings[i]->xid == xid_lookup)
{
bind->server_used = pings[i]->server_nr;
bind->current_ep = pings[i]->server_ep;
found = 1;
}
}
auth_destroy (clnt->cl_auth);
clnt_destroy (clnt);
close (sock);
for (i = 0; i < pings_count; ++i)
free (pings[i]);
free (pings);
return found;
}
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