1 /* $NetBSD: pmap_rmt.c,v 1.23 1999/09/20 04:39:23 lukem Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char *sccsid = "@(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro"; 36 static char *sccsid = "@(#)pmap_rmt.c 2.2 88/08/01 4.0 RPCSRC"; 37 #else 38 __RCSID("$NetBSD: pmap_rmt.c,v 1.23 1999/09/20 04:39:23 lukem Exp $"); 39 #endif 40 #endif 41 42 /* 43 * pmap_rmt.c 44 * Client interface to pmap rpc service. 45 * remote call and broadcast service 46 * 47 * Copyright (C) 1984, Sun Microsystems, Inc. 48 */ 49 50 #include "namespace.h" 51 52 #include <sys/types.h> 53 #include <sys/ioctl.h> 54 #include <sys/poll.h> 55 #include <sys/socket.h> 56 57 #include <net/if.h> 58 #include <netinet/in.h> 59 #include <arpa/inet.h> 60 61 #include <assert.h> 62 #include <err.h> 63 #include <errno.h> 64 #include <stdio.h> 65 #include <string.h> 66 #include <unistd.h> 67 68 #include <rpc/rpc.h> 69 #include <rpc/pmap_prot.h> 70 #include <rpc/pmap_clnt.h> 71 #include <rpc/pmap_rmt.h> 72 73 #ifdef __weak_alias 74 __weak_alias(clnt_broadcast,_clnt_broadcast); 75 __weak_alias(pmap_rmtcall,_pmap_rmtcall); 76 __weak_alias(xdr_rmtcall_args,_xdr_rmtcall_args); 77 __weak_alias(xdr_rmtcallres,_xdr_rmtcallres); 78 #endif 79 80 #define MAX_BROADCAST_SIZE 1400 81 82 static int getbroadcastnets __P((struct in_addr *, int, char *)); 83 84 static const struct timeval timeout = { 3, 0 }; 85 86 /* 87 * pmapper remote-call-service interface. 88 * This routine is used to call the pmapper remote call service 89 * which will look up a service program in the port maps, and then 90 * remotely call that routine with the given parameters. This allows 91 * programs to do a lookup and call in one step. 92 */ 93 enum clnt_stat 94 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, 95 port_ptr) 96 struct sockaddr_in *addr; 97 u_long prog, vers, proc; 98 xdrproc_t xdrargs, xdrres; 99 caddr_t argsp, resp; 100 struct timeval tout; 101 u_long *port_ptr; 102 { 103 int sock = -1; 104 CLIENT *client; 105 struct rmtcallargs a; 106 struct rmtcallres r; 107 enum clnt_stat stat; 108 109 _DIAGASSERT(addr != NULL); 110 _DIAGASSERT(port_ptr != NULL); 111 112 addr->sin_port = htons(PMAPPORT); 113 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock); 114 if (client != (CLIENT *)NULL) { 115 a.prog = prog; 116 a.vers = vers; 117 a.proc = proc; 118 a.args_ptr = argsp; 119 a.xdr_args = xdrargs; 120 r.port_ptr = port_ptr; 121 r.results_ptr = resp; 122 r.xdr_results = xdrres; 123 stat = CLNT_CALL(client, PMAPPROC_CALLIT, 124 (xdrproc_t)xdr_rmtcall_args, &a, (xdrproc_t)xdr_rmtcallres, 125 &r, tout); 126 CLNT_DESTROY(client); 127 } else { 128 stat = RPC_FAILED; 129 } 130 addr->sin_port = 0; 131 return (stat); 132 } 133 134 135 /* 136 * XDR remote call arguments 137 * written for XDR_ENCODE direction only 138 */ 139 bool_t 140 xdr_rmtcall_args(xdrs, cap) 141 XDR *xdrs; 142 struct rmtcallargs *cap; 143 { 144 u_int lenposition, argposition, position; 145 146 _DIAGASSERT(xdrs != NULL); 147 _DIAGASSERT(cap != NULL); 148 149 if (xdr_u_long(xdrs, &(cap->prog)) && 150 xdr_u_long(xdrs, &(cap->vers)) && 151 xdr_u_long(xdrs, &(cap->proc))) { 152 lenposition = XDR_GETPOS(xdrs); 153 if (! xdr_u_long(xdrs, &(cap->arglen))) 154 return (FALSE); 155 argposition = XDR_GETPOS(xdrs); 156 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 157 return (FALSE); 158 position = XDR_GETPOS(xdrs); 159 cap->arglen = (u_long)position - (u_long)argposition; 160 XDR_SETPOS(xdrs, lenposition); 161 if (! xdr_u_long(xdrs, &(cap->arglen))) 162 return (FALSE); 163 XDR_SETPOS(xdrs, position); 164 return (TRUE); 165 } 166 return (FALSE); 167 } 168 169 /* 170 * XDR remote call results 171 * written for XDR_DECODE direction only 172 */ 173 bool_t 174 xdr_rmtcallres(xdrs, crp) 175 XDR *xdrs; 176 struct rmtcallres *crp; 177 { 178 caddr_t port_ptr; 179 180 _DIAGASSERT(xdrs != NULL); 181 _DIAGASSERT(crp != NULL); 182 183 port_ptr = (caddr_t)(void *)crp->port_ptr; 184 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 185 (xdrproc_t)xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 186 crp->port_ptr = (u_long *)(void *)port_ptr; 187 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 188 } 189 return (FALSE); 190 } 191 192 193 /* 194 * The following is kludged-up support for simple rpc broadcasts. 195 * Someday a large, complicated system will replace these trivial 196 * routines which only support udp/ip . 197 */ 198 199 static int 200 getbroadcastnets(addrs, sock, buf) 201 struct in_addr *addrs; 202 int sock; /* any valid socket will do */ 203 char *buf; /* why allocxate more when we can use existing... */ 204 { 205 struct ifconf ifc; 206 struct ifreq ifreq, *ifr; 207 struct sockaddr_in *sin; 208 char *cp, *cplim; 209 int i = 0; 210 211 _DIAGASSERT(addrs != NULL); 212 _DIAGASSERT(buf != NULL); 213 214 ifc.ifc_len = UDPMSGSIZE; 215 ifc.ifc_buf = buf; 216 if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) { 217 warn("getbroadcastnets: ioctl (get interface configuration)"); 218 return (0); 219 } 220 #define max(a, b) (a > b ? a : b) 221 #define size(p) max((p).sa_len, sizeof(p)) 222 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 223 for (cp = buf; cp < cplim; 224 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 225 ifr = (struct ifreq *)(void *)cp; 226 if (ifr->ifr_addr.sa_family != AF_INET) 227 continue; 228 ifreq = *ifr; 229 if (ioctl(sock, SIOCGIFFLAGS, &ifreq) < 0) { 230 warn("getbroadcastnets: ioctl (get interface flags)"); 231 continue; 232 } 233 if ((ifreq.ifr_flags & IFF_BROADCAST) && 234 (ifreq.ifr_flags & IFF_UP)) { 235 sin = (struct sockaddr_in *)(void *)&ifr->ifr_addr; 236 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 237 if (ioctl(sock, SIOCGIFBRDADDR, &ifreq) < 0) { 238 addrs[i++] = 239 inet_makeaddr(inet_netof(sin->sin_addr), 240 (unsigned long)INADDR_ANY); 241 } else { 242 addrs[i++] = ((struct sockaddr_in *)(void *) 243 &ifreq.ifr_addr)->sin_addr; 244 } 245 #else /* 4.2 BSD */ 246 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), 247 INADDR_ANY); 248 #endif 249 } 250 } 251 return (i); 252 } 253 254 typedef bool_t (*resultproc_t) __P((caddr_t, struct sockaddr_in *)); 255 256 enum clnt_stat 257 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 258 u_long prog; /* program number */ 259 u_long vers; /* version number */ 260 u_long proc; /* procedure number */ 261 xdrproc_t xargs; /* xdr routine for args */ 262 caddr_t argsp; /* pointer to args */ 263 xdrproc_t xresults; /* xdr routine for results */ 264 caddr_t resultsp; /* pointer to results */ 265 resultproc_t eachresult; /* call with each result obtained */ 266 { 267 enum clnt_stat stat; 268 AUTH *unix_auth = authunix_create_default(); 269 XDR xdr_stream; 270 XDR *xdrs = &xdr_stream; 271 int inlen, nets; 272 socklen_t fromlen; 273 size_t outlen; 274 int sock; 275 int on = 1; 276 struct pollfd fd; 277 int i; 278 bool_t done = FALSE; 279 u_int32_t xid; 280 u_long port; 281 struct in_addr addrs[20]; 282 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 283 struct rmtcallargs a; 284 struct rmtcallres r; 285 struct rpc_msg msg; 286 struct timeval t; 287 int milliseconds; 288 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 289 290 /* 291 * initialization: create a socket, a broadcast address, and 292 * preserialize the arguments into a send buffer. 293 */ 294 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 295 warn("Cannot create socket for broadcast rpc"); 296 stat = RPC_CANTSEND; 297 goto done_broad; 298 } 299 #ifdef SO_BROADCAST 300 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 301 warn("Cannot set socket option SO_BROADCAST"); 302 stat = RPC_CANTSEND; 303 goto done_broad; 304 } 305 #endif /* def SO_BROADCAST */ 306 fd.fd = sock; 307 fd.events = POLLIN; 308 nets = getbroadcastnets(addrs, sock, inbuf); 309 memset(&baddr, 0, sizeof (baddr)); 310 baddr.sin_len = sizeof(struct sockaddr_in); 311 baddr.sin_family = AF_INET; 312 baddr.sin_port = htons(PMAPPORT); 313 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 314 (void)gettimeofday(&t, (struct timezone *)0); 315 msg.rm_xid = xid = (u_int32_t)(getpid() ^ t.tv_sec ^ t.tv_usec); 316 t.tv_usec = 0; 317 msg.rm_direction = CALL; 318 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 319 msg.rm_call.cb_prog = PMAPPROG; 320 msg.rm_call.cb_vers = PMAPVERS; 321 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 322 msg.rm_call.cb_cred = unix_auth->ah_cred; 323 msg.rm_call.cb_verf = unix_auth->ah_verf; 324 a.prog = prog; 325 a.vers = vers; 326 a.proc = proc; 327 a.xdr_args = xargs; 328 a.args_ptr = argsp; 329 r.port_ptr = &port; 330 r.xdr_results = xresults; 331 r.results_ptr = resultsp; 332 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 333 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 334 stat = RPC_CANTENCODEARGS; 335 goto done_broad; 336 } 337 outlen = xdr_getpos(xdrs); 338 xdr_destroy(xdrs); 339 /* 340 * Basic loop: broadcast a packet and wait a while for response(s). 341 * The response timeout grows larger per iteration. 342 */ 343 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 344 for (i = 0; i < nets; i++) { 345 baddr.sin_addr = addrs[i]; 346 if (sendto(sock, outbuf, outlen, 0, 347 (struct sockaddr *)(void *)&baddr, 348 sizeof (struct sockaddr)) != outlen) { 349 warn("Cannot send broadcast packet"); 350 stat = RPC_CANTSEND; 351 goto done_broad; 352 } 353 } 354 if (eachresult == NULL) { 355 stat = RPC_SUCCESS; 356 goto done_broad; 357 } 358 recv_again: 359 milliseconds = (int)(t.tv_sec * 1000 + t.tv_usec / 1000); 360 msg.acpted_rply.ar_verf = _null_auth; 361 msg.acpted_rply.ar_results.where = (caddr_t)(void *)&r; 362 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_rmtcallres; 363 switch (poll(&fd, 1, milliseconds)) { 364 365 case 0: /* timed out */ 366 stat = RPC_TIMEDOUT; 367 continue; 368 369 case -1: /* some kind of error */ 370 if (errno == EINTR) 371 goto recv_again; 372 warn("Broadcast poll problem"); 373 stat = RPC_CANTRECV; 374 goto done_broad; 375 376 } /* end of poll results switch */ 377 try_again: 378 fromlen = sizeof(struct sockaddr); 379 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 380 (struct sockaddr *)(void *)&raddr, &fromlen); 381 if (inlen < 0) { 382 if (errno == EINTR) 383 goto try_again; 384 warn("Cannot receive reply to broadcast"); 385 stat = RPC_CANTRECV; 386 goto done_broad; 387 } 388 if (inlen < sizeof(u_int32_t)) 389 goto recv_again; 390 /* 391 * see if reply transaction id matches sent id. 392 * If so, decode the results. 393 */ 394 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 395 if (xdr_replymsg(xdrs, &msg)) { 396 if ((msg.rm_xid == xid) && 397 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 398 (msg.acpted_rply.ar_stat == SUCCESS)) { 399 raddr.sin_port = htons((u_short)port); 400 done = (*eachresult)(resultsp, &raddr); 401 } 402 /* otherwise, we just ignore the errors ... */ 403 } else { 404 #ifdef notdef 405 /* some kind of deserialization problem ... */ 406 if (msg.rm_xid == xid) 407 fprintf(stderr, 408 "Broadcast deserialization problem"); 409 /* otherwise, just random garbage */ 410 #endif 411 } 412 xdrs->x_op = XDR_FREE; 413 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void; 414 (void)xdr_replymsg(xdrs, &msg); 415 (void)(*xresults)(xdrs, resultsp); 416 xdr_destroy(xdrs); 417 if (done) { 418 stat = RPC_SUCCESS; 419 goto done_broad; 420 } else { 421 goto recv_again; 422 } 423 } 424 stat = RPC_TIMEDOUT; 425 done_broad: 426 if (sock != -1) 427 (void)close(sock); 428 AUTH_DESTROY(unix_auth); 429 return (stat); 430 } 431