yp_ping.c revision 90298
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 90298 2002-02-06 15:26:07Z des $"; 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 <net/if.h> 94 95#include "yp_ping.h" 96 97struct cu_data { 98 int cu_fd; /* connections fd */ 99 bool_t cu_closeit; /* opened by library */ 100 struct sockaddr_storage cu_raddr; /* remote address */ 101 int cu_rlen; 102 struct timeval cu_wait; /* retransmit interval */ 103 struct timeval cu_total; /* total time for the call */ 104 struct rpc_err cu_error; 105 XDR cu_outxdrs; 106 u_int cu_xdrpos; 107 u_int cu_sendsz; /* send size */ 108 char *cu_outbuf; 109 u_int cu_recvsz; /* recv size */ 110 struct pollfd pfdp; 111 int cu_async; 112 char cu_inbuf[1]; 113}; 114 115/* 116 * pmap_getport.c 117 * Client interface to pmap rpc service. 118 * 119 * Copyright (C) 1984, Sun Microsystems, Inc. 120 */ 121 122 123static struct timeval timeout = { 1, 0 }; 124static struct timeval tottimeout = { 1, 0 }; 125 126/* 127 * Find the mapped port for program,version. 128 * Calls the pmap service remotely to do the lookup. 129 * Returns 0 if no map exists. 130 */ 131static u_short 132__pmap_getport(struct sockaddr_in *address, u_long program, u_long version, 133 u_int protocol) 134{ 135 u_short port = 0; 136 int sock = -1; 137 register CLIENT *client; 138 struct pmap parms; 139 140 address->sin_port = htons(PMAPPORT); 141 142 client = clntudp_bufcreate(address, PMAPPROG, 143 PMAPVERS, timeout, &sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE); 144 if (client != (CLIENT *)NULL) { 145 parms.pm_prog = program; 146 parms.pm_vers = version; 147 parms.pm_prot = protocol; 148 parms.pm_port = 0; /* not needed or used */ 149 if (CLNT_CALL(client, PMAPPROC_GETPORT, xdr_pmap, &parms, 150 xdr_u_short, &port, tottimeout) != RPC_SUCCESS){ 151 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 152 clnt_geterr(client, &rpc_createerr.cf_error); 153 } else if (port == 0) { 154 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 155 } 156 CLNT_DESTROY(client); 157 } 158 if (sock != -1) 159 (void)close(sock); 160 address->sin_port = 0; 161 return (port); 162} 163 164/* 165 * Transmit to YPPROC_DOMAIN_NONACK, return immediately. 166 */ 167static bool_t * 168ypproc_domain_nonack_2_send(domainname *argp, CLIENT *clnt) 169{ 170 static bool_t clnt_res; 171 struct timeval TIMEOUT = { 0, 0 }; 172 173 memset((char *)&clnt_res, 0, sizeof (clnt_res)); 174 if (clnt_call(clnt, YPPROC_DOMAIN_NONACK, 175 (xdrproc_t) xdr_domainname, (caddr_t) argp, 176 (xdrproc_t) xdr_bool, (caddr_t) &clnt_res, 177 TIMEOUT) != RPC_SUCCESS) { 178 return (NULL); 179 } 180 return (&clnt_res); 181} 182 183/* 184 * Receive response from YPPROC_DOMAIN_NONACK asynchronously. 185 */ 186static bool_t * 187ypproc_domain_nonack_2_recv(domainname *argp, CLIENT *clnt) 188{ 189 static bool_t clnt_res; 190 struct timeval TIMEOUT = { 0, 0 }; 191 192 memset((char *)&clnt_res, 0, sizeof (clnt_res)); 193 if (clnt_call(clnt, YPPROC_DOMAIN_NONACK, 194 (xdrproc_t) NULL, (caddr_t) argp, 195 (xdrproc_t) xdr_bool, (caddr_t) &clnt_res, 196 TIMEOUT) != RPC_SUCCESS) { 197 return (NULL); 198 } 199 return (&clnt_res); 200} 201 202/* 203 * "We have the machine that goes 'ping!'" -- Monty Python 204 * 205 * This function blasts packets at the YPPROC_DOMAIN_NONACK procedures 206 * of the NIS servers listed in restricted_addrs structure. 207 * Whoever replies the fastest becomes our chosen server. 208 * 209 * Note: THIS IS NOT A BROADCAST OPERATION! We could use clnt_broadcast() 210 * for this, but that has the following problems: 211 * - We only get the address of the machine that replied in the 212 * 'eachresult' callback, and on multi-homed machines this can 213 * lead to confusion. 214 * - clnt_broadcast() only transmits to local networks, whereas with 215 * NIS+ you can have a perfectly good server located anywhere on or 216 * off the local network. 217 * - clnt_broadcast() blocks for an arbitrary amount of time which the 218 * caller can't control -- we want to avoid that. 219 * 220 * Also note that this has nothing to do with the NIS_PING procedure used 221 * for replica updates. 222 */ 223 224struct ping_req { 225 struct sockaddr_in sin; 226 unsigned long xid; 227}; 228 229int 230__yp_ping(struct in_addr *restricted_addrs, int cnt, char *dom, short *port) 231{ 232 struct timeval tv = { 5, 0 }; 233 struct ping_req **reqs; 234 unsigned long i; 235 int async; 236 struct sockaddr_in sin, *any = NULL; 237 int winner = -1; 238 time_t xid_seed, xid_lookup; 239 int sock, dontblock = 1; 240 CLIENT *clnt; 241 char *foo = dom; 242 struct cu_data *cu; 243 int validsrvs = 0; 244 245 /* Set up handles. */ 246 reqs = calloc(1, sizeof(struct ping_req *) * cnt); 247 xid_seed = time(NULL) ^ getpid(); 248 249 for (i = 0; i < cnt; i++) { 250 bzero((char *)&sin, sizeof(sin)); 251 sin.sin_family = AF_INET; 252 bcopy((char *)&restricted_addrs[i], 253 (char *)&sin.sin_addr, sizeof(struct in_addr)); 254 sin.sin_port = htons(__pmap_getport(&sin, YPPROG, 255 YPVERS, IPPROTO_UDP)); 256 if (sin.sin_port == 0) 257 continue; 258 reqs[i] = calloc(1, sizeof(struct ping_req)); 259 bcopy((char *)&sin, (char *)&reqs[i]->sin, sizeof(sin)); 260 any = &reqs[i]->sin; 261 reqs[i]->xid = xid_seed; 262 xid_seed++; 263 validsrvs++; 264 } 265 266 /* Make sure at least one server was assigned */ 267 if (!validsrvs) { 268 free(reqs); 269 return(-1); 270 } 271 272 /* Create RPC handle */ 273 sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 274 clnt = clntudp_create(any, YPPROG, YPVERS, tv, &sock); 275 if (clnt == NULL) { 276 close(sock); 277 for (i = 0; i < cnt; i++) 278 if (reqs[i] != NULL) 279 free(reqs[i]); 280 free(reqs); 281 return(-1); 282 } 283 clnt->cl_auth = authunix_create_default(); 284 cu = (struct cu_data *)clnt->cl_private; 285 tv.tv_sec = 0; 286 287 clnt_control(clnt, CLSET_TIMEOUT, (char *)&tv); 288 async = TRUE; 289 clnt_control(clnt, CLSET_ASYNC, (char *)&async); 290 ioctl(sock, FIONBIO, &dontblock); 291 292 /* Transmit */ 293 for (i = 0; i < cnt; i++) { 294 if (reqs[i] != NULL) { 295 clnt_control(clnt, CLSET_XID, (char *)&reqs[i]->xid); 296 bcopy((char *)&reqs[i]->sin, (char *)&cu->cu_raddr, 297 sizeof(struct sockaddr_in)); 298 ypproc_domain_nonack_2_send(&foo, clnt); 299 } 300 } 301 302 /* Receive reply */ 303 ypproc_domain_nonack_2_recv(&foo, clnt); 304 305 /* Got a winner -- look him up. */ 306 clnt_control(clnt, CLGET_XID, (char *)&xid_lookup); 307 for (i = 0; i < cnt; i++) { 308 if (reqs[i] != NULL && reqs[i]->xid == xid_lookup) { 309 winner = i; 310 *port = reqs[i]->sin.sin_port; 311 } 312 } 313 314 /* Shut everything down */ 315 auth_destroy(clnt->cl_auth); 316 clnt_destroy(clnt); 317 close(sock); 318 319 for (i = 0; i < cnt; i++) 320 if (reqs[i] != NULL) 321 free(reqs[i]); 322 free(reqs); 323 324 return(winner); 325} 326