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 64 static char *sccsid = "@(#)from: clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro"; 65 static char *sccsid = "@(#)from: clnt_udp.c 2.2 88/08/01 4.0 RPCSRC"; 66 #endif 67 static const char rcsid[] = 68 "$FreeBSD$"; 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 98 struct 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 */ 122 123 124 static struct timeval timeout = { 1, 0 }; 125 static 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 */ 132 static 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, xdr_pmap, &parms, 151 xdr_u_short, &port, tottimeout) != RPC_SUCCESS){ 152 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 153 clnt_geterr(client, &rpc_createerr.cf_error); 154 } else if (port == 0) { 155 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 156 } 157 CLNT_DESTROY(client); 158 } 159 if (sock != -1) 160 (void)close(sock); 161 address->sin_port = 0; 162 return (port); 163 } 164 165 /* 166 * Transmit to YPPROC_DOMAIN_NONACK, return immediately. 167 */ 168 static bool_t * 169 ypproc_domain_nonack_2_send(domainname *argp, CLIENT *clnt) 170 { 171 static bool_t clnt_res; 172 struct timeval TIMEOUT = { 0, 0 }; 173 174 memset((char *)&clnt_res, 0, sizeof (clnt_res)); 175 if (clnt_call(clnt, YPPROC_DOMAIN_NONACK, 176 (xdrproc_t) xdr_domainname, (caddr_t) argp, 177 (xdrproc_t) xdr_bool, (caddr_t) &clnt_res, 178 TIMEOUT) != RPC_SUCCESS) { 179 return (NULL); 180 } 181 return (&clnt_res); 182 } 183 184 /* 185 * Receive response from YPPROC_DOMAIN_NONACK asynchronously. 186 */ 187 static bool_t * 188 ypproc_domain_nonack_2_recv(domainname *argp, CLIENT *clnt) 189 { 190 static bool_t clnt_res; 191 struct timeval TIMEOUT = { 0, 0 }; 192 193 memset((char *)&clnt_res, 0, sizeof (clnt_res)); 194 if (clnt_call(clnt, YPPROC_DOMAIN_NONACK, 195 (xdrproc_t) NULL, (caddr_t) argp, 196 (xdrproc_t) xdr_bool, (caddr_t) &clnt_res, 197 TIMEOUT) != RPC_SUCCESS) { 198 return (NULL); 199 } 200 return (&clnt_res); 201 } 202 203 /* 204 * "We have the machine that goes 'ping!'" -- Monty Python 205 * 206 * This function blasts packets at the YPPROC_DOMAIN_NONACK procedures 207 * of the NIS servers listed in restricted_addrs structure. 208 * Whoever replies the fastest becomes our chosen server. 209 * 210 * Note: THIS IS NOT A BROADCAST OPERATION! We could use clnt_broadcast() 211 * for this, but that has the following problems: 212 * - We only get the address of the machine that replied in the 213 * 'eachresult' callback, and on multi-homed machines this can 214 * lead to confusion. 215 * - clnt_broadcast() only transmits to local networks, whereas with 216 * NIS+ you can have a perfectly good server located anywhere on or 217 * off the local network. 218 * - clnt_broadcast() blocks for an arbitrary amount of time which the 219 * caller can't control -- we want to avoid that. 220 * 221 * Also note that this has nothing to do with the NIS_PING procedure used 222 * for replica updates. 223 */ 224 225 struct ping_req { 226 struct sockaddr_in sin; 227 unsigned long xid; 228 }; 229 230 int 231 __yp_ping(struct in_addr *restricted_addrs, int cnt, char *dom, short *port) 232 { 233 struct timeval tv = { 5, 0 }; 234 struct ping_req **reqs; 235 unsigned long i; 236 int async; 237 struct sockaddr_in sin, *any = NULL; 238 int winner = -1; 239 time_t xid_seed, xid_lookup; 240 int sock, dontblock = 1; 241 CLIENT *clnt; 242 char *foo = dom; 243 struct cu_data *cu; 244 int validsrvs = 0; 245 246 /* Set up handles. */ 247 reqs = calloc(1, sizeof(struct ping_req *) * cnt); 248 xid_seed = time(NULL) ^ getpid(); 249 250 for (i = 0; i < cnt; i++) { 251 bzero((char *)&sin, sizeof(sin)); 252 sin.sin_family = AF_INET; 253 bcopy((char *)&restricted_addrs[i], 254 (char *)&sin.sin_addr, sizeof(struct in_addr)); 255 sin.sin_port = htons(__pmap_getport(&sin, YPPROG, 256 YPVERS, IPPROTO_UDP)); 257 if (sin.sin_port == 0) 258 continue; 259 reqs[i] = calloc(1, sizeof(struct ping_req)); 260 bcopy((char *)&sin, (char *)&reqs[i]->sin, sizeof(sin)); 261 any = &reqs[i]->sin; 262 reqs[i]->xid = xid_seed; 263 xid_seed++; 264 validsrvs++; 265 } 266 267 /* Make sure at least one server was assigned */ 268 if (!validsrvs) { 269 free(reqs); 270 return(-1); 271 } 272 273 /* Create RPC handle */ 274 sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 275 clnt = clntudp_create(any, YPPROG, YPVERS, tv, &sock); 276 if (clnt == NULL) { 277 close(sock); 278 for (i = 0; i < cnt; i++) 279 if (reqs[i] != NULL) 280 free(reqs[i]); 281 free(reqs); 282 return(-1); 283 } 284 clnt->cl_auth = authunix_create_default(); 285 cu = (struct cu_data *)clnt->cl_private; 286 tv.tv_sec = 0; 287 288 clnt_control(clnt, CLSET_TIMEOUT, (char *)&tv); 289 async = TRUE; 290 clnt_control(clnt, CLSET_ASYNC, (char *)&async); 291 ioctl(sock, FIONBIO, &dontblock); 292 293 /* Transmit */ 294 for (i = 0; i < cnt; i++) { 295 if (reqs[i] != NULL) { 296 clnt_control(clnt, CLSET_XID, (char *)&reqs[i]->xid); 297 bcopy((char *)&reqs[i]->sin, (char *)&cu->cu_raddr, 298 sizeof(struct sockaddr_in)); 299 ypproc_domain_nonack_2_send(&foo, clnt); 300 } 301 } 302 303 /* Receive reply */ 304 ypproc_domain_nonack_2_recv(&foo, clnt); 305 306 /* Got a winner -- look him up. */ 307 clnt_control(clnt, CLGET_XID, (char *)&xid_lookup); 308 for (i = 0; i < cnt; i++) { 309 if (reqs[i] != NULL && reqs[i]->xid == xid_lookup) { 310 winner = i; 311 *port = reqs[i]->sin.sin_port; 312 } 313 } 314 315 /* Shut everything down */ 316 auth_destroy(clnt->cl_auth); 317 clnt_destroy(clnt); 318 close(sock); 319 320 for (i = 0; i < cnt; i++) 321 if (reqs[i] != NULL) 322 free(reqs[i]); 323 free(reqs); 324 325 return(winner); 326 } 327