yp_ping.c revision 103428
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#ifndef lint 63#if 0 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 67static const char rcsid[] = 68 "$FreeBSD: head/usr.sbin/ypbind/yp_ping.c 103428 2002-09-16 21:39:42Z fenner $"; 69#endif 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 98struct cu_data { 99 int cu_fd; /* connections fd */ 100 bool_t cu_closeit; /* opened by library */ 101 struct sockaddr_storage cu_raddr; /* remote address */ 102 int cu_rlen; 103 struct timeval cu_wait; /* retransmit interval */ 104 struct timeval cu_total; /* total time for the call */ 105 struct rpc_err cu_error; 106 XDR cu_outxdrs; 107 u_int cu_xdrpos; 108 u_int cu_sendsz; /* send size */ 109 char *cu_outbuf; 110 u_int cu_recvsz; /* recv size */ 111 struct pollfd pfdp; 112 int cu_async; 113 char cu_inbuf[1]; 114}; 115 116/* 117 * pmap_getport.c 118 * Client interface to pmap rpc service. 119 * 120 * Copyright (C) 1984, Sun Microsystems, Inc. 121 */ 122 123 124static struct timeval timeout = { 1, 0 }; 125static struct timeval tottimeout = { 1, 0 }; 126 127/* 128 * Find the mapped port for program,version. 129 * Calls the pmap service remotely to do the lookup. 130 * Returns 0 if no map exists. 131 */ 132static u_short 133__pmap_getport(struct sockaddr_in *address, u_long program, u_long version, 134 u_int protocol) 135{ 136 u_short port = 0; 137 int sock = -1; 138 register CLIENT *client; 139 struct pmap parms; 140 141 address->sin_port = htons(PMAPPORT); 142 143 client = clntudp_bufcreate(address, PMAPPROG, 144 PMAPVERS, timeout, &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE); 145 if (client != (CLIENT *)NULL) { 146 parms.pm_prog = program; 147 parms.pm_vers = version; 148 parms.pm_prot = protocol; 149 parms.pm_port = 0; /* not needed or used */ 150 if (CLNT_CALL(client, PMAPPROC_GETPORT, 151 (xdrproc_t)xdr_pmap, &parms, 152 (xdrproc_t)xdr_u_short, &port, 153 tottimeout) != RPC_SUCCESS){ 154 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 155 clnt_geterr(client, &rpc_createerr.cf_error); 156 } else if (port == 0) { 157 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 158 } 159 CLNT_DESTROY(client); 160 } 161 if (sock != -1) 162 (void)close(sock); 163 address->sin_port = 0; 164 return (port); 165} 166 167/* 168 * Transmit to YPPROC_DOMAIN_NONACK, return immediately. 169 */ 170static bool_t * 171ypproc_domain_nonack_2_send(domainname *argp, CLIENT *clnt) 172{ 173 static bool_t clnt_res; 174 struct timeval TIMEOUT = { 0, 0 }; 175 176 memset((char *)&clnt_res, 0, sizeof (clnt_res)); 177 if (clnt_call(clnt, YPPROC_DOMAIN_NONACK, 178 (xdrproc_t) xdr_domainname, (caddr_t) argp, 179 (xdrproc_t) xdr_bool, (caddr_t) &clnt_res, 180 TIMEOUT) != RPC_SUCCESS) { 181 return (NULL); 182 } 183 return (&clnt_res); 184} 185 186/* 187 * Receive response from YPPROC_DOMAIN_NONACK asynchronously. 188 */ 189static bool_t * 190ypproc_domain_nonack_2_recv(domainname *argp, CLIENT *clnt) 191{ 192 static bool_t clnt_res; 193 struct timeval TIMEOUT = { 0, 0 }; 194 195 memset((char *)&clnt_res, 0, sizeof (clnt_res)); 196 if (clnt_call(clnt, YPPROC_DOMAIN_NONACK, 197 (xdrproc_t) NULL, (caddr_t) argp, 198 (xdrproc_t) xdr_bool, (caddr_t) &clnt_res, 199 TIMEOUT) != RPC_SUCCESS) { 200 return (NULL); 201 } 202 return (&clnt_res); 203} 204 205/* 206 * "We have the machine that goes 'ping!'" -- Monty Python 207 * 208 * This function blasts packets at the YPPROC_DOMAIN_NONACK procedures 209 * of the NIS servers listed in restricted_addrs structure. 210 * Whoever replies the fastest becomes our chosen server. 211 * 212 * Note: THIS IS NOT A BROADCAST OPERATION! We could use clnt_broadcast() 213 * for this, but that has the following problems: 214 * - We only get the address of the machine that replied in the 215 * 'eachresult' callback, and on multi-homed machines this can 216 * lead to confusion. 217 * - clnt_broadcast() only transmits to local networks, whereas with 218 * NIS+ you can have a perfectly good server located anywhere on or 219 * off the local network. 220 * - clnt_broadcast() blocks for an arbitrary amount of time which the 221 * caller can't control -- we want to avoid that. 222 * 223 * Also note that this has nothing to do with the NIS_PING procedure used 224 * for replica updates. 225 */ 226 227struct ping_req { 228 struct sockaddr_in sin; 229 u_int32_t xid; 230}; 231 232int 233__yp_ping(struct in_addr *restricted_addrs, int cnt, char *dom, short *port) 234{ 235 struct timeval tv = { 5, 0 }; 236 struct ping_req **reqs; 237 unsigned long i; 238 int async; 239 struct sockaddr_in sin, *any = NULL; 240 int winner = -1; 241 u_int32_t xid_seed, xid_lookup; 242 int sock, dontblock = 1; 243 CLIENT *clnt; 244 char *foo = dom; 245 struct cu_data *cu; 246 int validsrvs = 0; 247 248 /* Set up handles. */ 249 reqs = calloc(1, sizeof(struct ping_req *) * cnt); 250 xid_seed = time(NULL) ^ getpid(); 251 252 for (i = 0; i < cnt; i++) { 253 bzero((char *)&sin, sizeof(sin)); 254 sin.sin_family = AF_INET; 255 bcopy((char *)&restricted_addrs[i], 256 (char *)&sin.sin_addr, sizeof(struct in_addr)); 257 sin.sin_port = htons(__pmap_getport(&sin, YPPROG, 258 YPVERS, IPPROTO_UDP)); 259 if (sin.sin_port == 0) 260 continue; 261 reqs[i] = calloc(1, sizeof(struct ping_req)); 262 bcopy((char *)&sin, (char *)&reqs[i]->sin, sizeof(sin)); 263 any = &reqs[i]->sin; 264 reqs[i]->xid = xid_seed; 265 xid_seed++; 266 validsrvs++; 267 } 268 269 /* Make sure at least one server was assigned */ 270 if (!validsrvs) { 271 free(reqs); 272 return(-1); 273 } 274 275 /* Create RPC handle */ 276 sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 277 clnt = clntudp_create(any, YPPROG, YPVERS, tv, &sock); 278 if (clnt == NULL) { 279 close(sock); 280 for (i = 0; i < cnt; i++) 281 if (reqs[i] != NULL) 282 free(reqs[i]); 283 free(reqs); 284 return(-1); 285 } 286 clnt->cl_auth = authunix_create_default(); 287 cu = (struct cu_data *)clnt->cl_private; 288 tv.tv_sec = 0; 289 290 clnt_control(clnt, CLSET_TIMEOUT, (char *)&tv); 291 async = TRUE; 292 clnt_control(clnt, CLSET_ASYNC, (char *)&async); 293 ioctl(sock, FIONBIO, &dontblock); 294 295 /* Transmit */ 296 for (i = 0; i < cnt; i++) { 297 if (reqs[i] != NULL) { 298 clnt_control(clnt, CLSET_XID, (char *)&reqs[i]->xid); 299 bcopy((char *)&reqs[i]->sin, (char *)&cu->cu_raddr, 300 sizeof(struct sockaddr_in)); 301 ypproc_domain_nonack_2_send(&foo, clnt); 302 } 303 } 304 305 /* Receive reply */ 306 ypproc_domain_nonack_2_recv(&foo, clnt); 307 308 /* Got a winner -- look him up. */ 309 clnt_control(clnt, CLGET_XID, (char *)&xid_lookup); 310 for (i = 0; i < cnt; i++) { 311 if (reqs[i] != NULL && reqs[i]->xid == xid_lookup) { 312 winner = i; 313 *port = reqs[i]->sin.sin_port; 314 } 315 } 316 317 /* Shut everything down */ 318 auth_destroy(clnt->cl_auth); 319 clnt_destroy(clnt); 320 close(sock); 321 322 for (i = 0; i < cnt; i++) 323 if (reqs[i] != NULL) 324 free(reqs[i]); 325 free(reqs); 326 327 return(winner); 328} 329