yp_ping.c revision 225736
1/* 2 * Copyright (c) 1996, 1997 3 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Bill Paul. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 35 * unrestricted use provided that this legend is included on all tape 36 * media and as a part of the software program in whole or part. Users 37 * may copy or modify Sun RPC without charge, but are not authorized 38 * to license or distribute it to anyone else except as part of a product or 39 * program developed by the user. 40 * 41 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 42 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 44 * 45 * Sun RPC is provided with no support and without any obligation on the 46 * part of Sun Microsystems, Inc. to assist in its use, correction, 47 * modification or enhancement. 48 * 49 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 50 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 51 * OR ANY PART THEREOF. 52 * 53 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 54 * or profits or other special, indirect and consequential damages, even if 55 * Sun has been advised of the possibility of such damages. 56 * 57 * Sun Microsystems, Inc. 58 * 2550 Garcia Avenue 59 * Mountain View, California 94043 60 */ 61 62#if 0 63#ifndef lint 64static char *sccsid = "@(#)from: clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro"; 65static char *sccsid = "@(#)from: clnt_udp.c 2.2 88/08/01 4.0 RPCSRC"; 66#endif 67#endif 68#include <sys/cdefs.h> 69__FBSDID("$FreeBSD: stable/9/usr.sbin/ypbind/yp_ping.c 183038 2008-09-15 14:01:40Z dfr $"); 70 71/* 72 * clnt_udp.c, Implements a UDP/IP based, client side RPC. 73 * 74 * Copyright (C) 1984, Sun Microsystems, Inc. 75 */ 76 77#include <errno.h> 78#include <netdb.h> 79#include <stdio.h> 80#include <stdlib.h> 81#include <string.h> 82#include <unistd.h> 83#include <pthread.h> 84#include <rpc/rpc.h> 85#include <rpc/pmap_clnt.h> 86#include <rpc/pmap_prot.h> 87#include <rpcsvc/yp.h> 88#include <sys/types.h> 89#include <sys/poll.h> 90#include <sys/socket.h> 91#include <sys/signal.h> 92#include <sys/ioctl.h> 93#include <arpa/inet.h> 94#include <net/if.h> 95 96#include "yp_ping.h" 97 98/* 99 * pmap_getport.c 100 * Client interface to pmap rpc service. 101 * 102 * Copyright (C) 1984, Sun Microsystems, Inc. 103 */ 104 105 106static struct timeval timeout = { 1, 0 }; 107static struct timeval tottimeout = { 1, 0 }; 108 109/* 110 * Find the mapped port for program,version. 111 * Calls the pmap service remotely to do the lookup. 112 * Returns 0 if no map exists. 113 */ 114static u_short 115__pmap_getport(struct sockaddr_in *address, u_long program, u_long version, 116 u_int protocol) 117{ 118 u_short port = 0; 119 int sock = -1; 120 register CLIENT *client; 121 struct pmap parms; 122 123 address->sin_port = htons(PMAPPORT); 124 125 client = clntudp_bufcreate(address, PMAPPROG, 126 PMAPVERS, timeout, &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE); 127 if (client != (CLIENT *)NULL) { 128 parms.pm_prog = program; 129 parms.pm_vers = version; 130 parms.pm_prot = protocol; 131 parms.pm_port = 0; /* not needed or used */ 132 if (CLNT_CALL(client, PMAPPROC_GETPORT, 133 (xdrproc_t)xdr_pmap, &parms, 134 (xdrproc_t)xdr_u_short, &port, 135 tottimeout) != RPC_SUCCESS){ 136 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 137 clnt_geterr(client, &rpc_createerr.cf_error); 138 } else if (port == 0) { 139 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 140 } 141 CLNT_DESTROY(client); 142 } 143 if (sock != -1) 144 (void)close(sock); 145 address->sin_port = 0; 146 return (port); 147} 148 149/* 150 * Transmit to YPPROC_DOMAIN_NONACK, return immediately. 151 */ 152static bool_t * 153ypproc_domain_nonack_2_send(domainname *argp, CLIENT *clnt) 154{ 155 static bool_t clnt_res; 156 struct timeval TIMEOUT = { 0, 0 }; 157 158 memset((char *)&clnt_res, 0, sizeof (clnt_res)); 159 if (clnt_call(clnt, YPPROC_DOMAIN_NONACK, 160 (xdrproc_t) xdr_domainname, (caddr_t) argp, 161 (xdrproc_t) xdr_bool, (caddr_t) &clnt_res, 162 TIMEOUT) != RPC_SUCCESS) { 163 return (NULL); 164 } 165 return (&clnt_res); 166} 167 168/* 169 * Receive response from YPPROC_DOMAIN_NONACK asynchronously. 170 */ 171static bool_t * 172ypproc_domain_nonack_2_recv(domainname *argp, CLIENT *clnt) 173{ 174 static bool_t clnt_res; 175 struct timeval TIMEOUT = { 0, 0 }; 176 177 memset((char *)&clnt_res, 0, sizeof (clnt_res)); 178 if (clnt_call(clnt, YPPROC_DOMAIN_NONACK, 179 (xdrproc_t) NULL, (caddr_t) argp, 180 (xdrproc_t) xdr_bool, (caddr_t) &clnt_res, 181 TIMEOUT) != RPC_SUCCESS) { 182 return (NULL); 183 } 184 return (&clnt_res); 185} 186 187/* 188 * "We have the machine that goes 'ping!'" -- Monty Python 189 * 190 * This function blasts packets at the YPPROC_DOMAIN_NONACK procedures 191 * of the NIS servers listed in restricted_addrs structure. 192 * Whoever replies the fastest becomes our chosen server. 193 * 194 * Note: THIS IS NOT A BROADCAST OPERATION! We could use clnt_broadcast() 195 * for this, but that has the following problems: 196 * - We only get the address of the machine that replied in the 197 * 'eachresult' callback, and on multi-homed machines this can 198 * lead to confusion. 199 * - clnt_broadcast() only transmits to local networks, whereas with 200 * NIS+ you can have a perfectly good server located anywhere on or 201 * off the local network. 202 * - clnt_broadcast() blocks for an arbitrary amount of time which the 203 * caller can't control -- we want to avoid that. 204 * 205 * Also note that this has nothing to do with the NIS_PING procedure used 206 * for replica updates. 207 */ 208 209struct ping_req { 210 struct sockaddr_in sin; 211 u_int32_t xid; 212}; 213 214int 215__yp_ping(struct in_addr *restricted_addrs, int cnt, char *dom, short *port) 216{ 217 struct timeval tv = { 5, 0 }; 218 struct ping_req **reqs; 219 unsigned long i; 220 int async; 221 struct sockaddr_in sin, *any = NULL; 222 struct netbuf addr; 223 int winner = -1; 224 u_int32_t xid_seed, xid_lookup; 225 int sock, dontblock = 1; 226 CLIENT *clnt; 227 char *foo = dom; 228 int validsrvs = 0; 229 230 /* Set up handles. */ 231 reqs = calloc(1, sizeof(struct ping_req *) * cnt); 232 xid_seed = time(NULL) ^ getpid(); 233 234 for (i = 0; i < cnt; i++) { 235 bzero((char *)&sin, sizeof(sin)); 236 sin.sin_family = AF_INET; 237 bcopy((char *)&restricted_addrs[i], 238 (char *)&sin.sin_addr, sizeof(struct in_addr)); 239 sin.sin_port = htons(__pmap_getport(&sin, YPPROG, 240 YPVERS, IPPROTO_UDP)); 241 if (sin.sin_port == 0) 242 continue; 243 reqs[i] = calloc(1, sizeof(struct ping_req)); 244 bcopy((char *)&sin, (char *)&reqs[i]->sin, sizeof(sin)); 245 any = &reqs[i]->sin; 246 reqs[i]->xid = xid_seed; 247 xid_seed++; 248 validsrvs++; 249 } 250 251 /* Make sure at least one server was assigned */ 252 if (!validsrvs) { 253 free(reqs); 254 return(-1); 255 } 256 257 /* Create RPC handle */ 258 sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 259 clnt = clntudp_create(any, YPPROG, YPVERS, tv, &sock); 260 if (clnt == NULL) { 261 close(sock); 262 for (i = 0; i < cnt; i++) 263 if (reqs[i] != NULL) 264 free(reqs[i]); 265 free(reqs); 266 return(-1); 267 } 268 clnt->cl_auth = authunix_create_default(); 269 tv.tv_sec = 0; 270 271 clnt_control(clnt, CLSET_TIMEOUT, (char *)&tv); 272 async = TRUE; 273 clnt_control(clnt, CLSET_ASYNC, (char *)&async); 274 ioctl(sock, FIONBIO, &dontblock); 275 276 /* Transmit */ 277 for (i = 0; i < cnt; i++) { 278 if (reqs[i] != NULL) { 279 clnt_control(clnt, CLSET_XID, (char *)&reqs[i]->xid); 280 addr.len = sizeof(reqs[i]->sin); 281 addr.buf = (char *) &reqs[i]->sin; 282 clnt_control(clnt, CLSET_SVC_ADDR, &addr); 283 ypproc_domain_nonack_2_send(&foo, clnt); 284 } 285 } 286 287 /* Receive reply */ 288 ypproc_domain_nonack_2_recv(&foo, clnt); 289 290 /* Got a winner -- look him up. */ 291 clnt_control(clnt, CLGET_XID, (char *)&xid_lookup); 292 for (i = 0; i < cnt; i++) { 293 if (reqs[i] != NULL && reqs[i]->xid == xid_lookup) { 294 winner = i; 295 *port = reqs[i]->sin.sin_port; 296 } 297 } 298 299 /* Shut everything down */ 300 auth_destroy(clnt->cl_auth); 301 clnt_destroy(clnt); 302 close(sock); 303 304 for (i = 0; i < cnt; i++) 305 if (reqs[i] != NULL) 306 free(reqs[i]); 307 free(reqs); 308 309 return(winner); 310} 311