1 /* $NetBSD: pmap_rmt.c,v 1.17 1998/11/15 17:32:43 christos 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 1.17 1998/11/15 17:32:43 christos 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 <err.h> 62 #include <errno.h> 63 #include <stdio.h> 64 #include <string.h> 65 #include <unistd.h> 66 67 #include <rpc/rpc.h> 68 #include <rpc/pmap_prot.h> 69 #include <rpc/pmap_clnt.h> 70 #include <rpc/pmap_rmt.h> 71 72 #ifdef __weak_alias 73 __weak_alias(clnt_broadcast,_clnt_broadcast); 74 __weak_alias(pmap_rmtcall,_pmap_rmtcall); 75 __weak_alias(xdr_rmtcall_args,_xdr_rmtcall_args); 76 __weak_alias(xdr_rmtcallres,_xdr_rmtcallres); 77 #endif 78 79 #define MAX_BROADCAST_SIZE 1400 80 81 static int getbroadcastnets __P((struct in_addr *, int, char *)); 82 83 static const struct timeval timeout = { 3, 0 }; 84 85 /* 86 * pmapper remote-call-service interface. 87 * This routine is used to call the pmapper remote call service 88 * which will look up a service program in the port maps, and then 89 * remotely call that routine with the given parameters. This allows 90 * programs to do a lookup and call in one step. 91 */ 92 enum clnt_stat 93 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 94 struct sockaddr_in *addr; 95 u_long prog, vers, proc; 96 xdrproc_t xdrargs, xdrres; 97 caddr_t argsp, resp; 98 struct timeval tout; 99 u_long *port_ptr; 100 { 101 int sock = -1; 102 CLIENT *client; 103 struct rmtcallargs a; 104 struct rmtcallres r; 105 enum clnt_stat stat; 106 107 addr->sin_port = htons(PMAPPORT); 108 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock); 109 if (client != (CLIENT *)NULL) { 110 a.prog = prog; 111 a.vers = vers; 112 a.proc = proc; 113 a.args_ptr = argsp; 114 a.xdr_args = xdrargs; 115 r.port_ptr = port_ptr; 116 r.results_ptr = resp; 117 r.xdr_results = xdrres; 118 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 119 xdr_rmtcallres, &r, tout); 120 CLNT_DESTROY(client); 121 } else { 122 stat = RPC_FAILED; 123 } 124 (void)close(sock); 125 addr->sin_port = 0; 126 return (stat); 127 } 128 129 130 /* 131 * XDR remote call arguments 132 * written for XDR_ENCODE direction only 133 */ 134 bool_t 135 xdr_rmtcall_args(xdrs, cap) 136 XDR *xdrs; 137 struct rmtcallargs *cap; 138 { 139 u_int lenposition, argposition, position; 140 141 if (xdr_u_long(xdrs, &(cap->prog)) && 142 xdr_u_long(xdrs, &(cap->vers)) && 143 xdr_u_long(xdrs, &(cap->proc))) { 144 lenposition = XDR_GETPOS(xdrs); 145 if (! xdr_u_long(xdrs, &(cap->arglen))) 146 return (FALSE); 147 argposition = XDR_GETPOS(xdrs); 148 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 149 return (FALSE); 150 position = XDR_GETPOS(xdrs); 151 cap->arglen = (u_long)position - (u_long)argposition; 152 XDR_SETPOS(xdrs, lenposition); 153 if (! xdr_u_long(xdrs, &(cap->arglen))) 154 return (FALSE); 155 XDR_SETPOS(xdrs, position); 156 return (TRUE); 157 } 158 return (FALSE); 159 } 160 161 /* 162 * XDR remote call results 163 * written for XDR_DECODE direction only 164 */ 165 bool_t 166 xdr_rmtcallres(xdrs, crp) 167 XDR *xdrs; 168 struct rmtcallres *crp; 169 { 170 caddr_t port_ptr; 171 172 port_ptr = (caddr_t)(void *)crp->port_ptr; 173 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 174 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 175 crp->port_ptr = (u_long *)(void *)port_ptr; 176 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 177 } 178 return (FALSE); 179 } 180 181 182 /* 183 * The following is kludged-up support for simple rpc broadcasts. 184 * Someday a large, complicated system will replace these trivial 185 * routines which only support udp/ip . 186 */ 187 188 static int 189 getbroadcastnets(addrs, sock, buf) 190 struct in_addr *addrs; 191 int sock; /* any valid socket will do */ 192 char *buf; /* why allocxate more when we can use existing... */ 193 { 194 struct ifconf ifc; 195 struct ifreq ifreq, *ifr; 196 struct sockaddr_in *sin; 197 char *cp, *cplim; 198 int i = 0; 199 200 ifc.ifc_len = UDPMSGSIZE; 201 ifc.ifc_buf = buf; 202 if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) { 203 warnx("getbroadcastnets: ioctl (get interface configuration)"); 204 return (0); 205 } 206 #define max(a, b) (a > b ? a : b) 207 #define size(p) max((p).sa_len, sizeof(p)) 208 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 209 for (cp = buf; cp < cplim; 210 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 211 ifr = (struct ifreq *)(void *)cp; 212 if (ifr->ifr_addr.sa_family != AF_INET) 213 continue; 214 ifreq = *ifr; 215 if (ioctl(sock, SIOCGIFFLAGS, &ifreq) < 0) { 216 warnx("getbroadcastnets: ioctl (get interface flags)"); 217 continue; 218 } 219 if ((ifreq.ifr_flags & IFF_BROADCAST) && 220 (ifreq.ifr_flags & IFF_UP)) { 221 sin = (struct sockaddr_in *)(void *)&ifr->ifr_addr; 222 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 223 if (ioctl(sock, SIOCGIFBRDADDR, &ifreq) < 0) { 224 addrs[i++] = 225 inet_makeaddr(inet_netof(sin->sin_addr), 226 (unsigned long)INADDR_ANY); 227 } else { 228 addrs[i++] = ((struct sockaddr_in *)(void *) 229 &ifreq.ifr_addr)->sin_addr; 230 } 231 #else /* 4.2 BSD */ 232 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), 233 INADDR_ANY); 234 #endif 235 } 236 } 237 return (i); 238 } 239 240 typedef bool_t (*resultproc_t) __P((caddr_t, struct sockaddr_in *)); 241 242 enum clnt_stat 243 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 244 u_long prog; /* program number */ 245 u_long vers; /* version number */ 246 u_long proc; /* procedure number */ 247 xdrproc_t xargs; /* xdr routine for args */ 248 caddr_t argsp; /* pointer to args */ 249 xdrproc_t xresults; /* xdr routine for results */ 250 caddr_t resultsp; /* pointer to results */ 251 resultproc_t eachresult; /* call with each result obtained */ 252 { 253 enum clnt_stat stat; 254 AUTH *unix_auth = authunix_create_default(); 255 XDR xdr_stream; 256 XDR *xdrs = &xdr_stream; 257 int inlen, fromlen, nets; 258 size_t outlen; 259 int sock; 260 int on = 1; 261 struct pollfd fd; 262 int i; 263 bool_t done = FALSE; 264 u_int32_t xid; 265 u_long port; 266 struct in_addr addrs[20]; 267 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 268 struct rmtcallargs a; 269 struct rmtcallres r; 270 struct rpc_msg msg; 271 struct timeval t; 272 int milliseconds; 273 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 274 275 /* 276 * initialization: create a socket, a broadcast address, and 277 * preserialize the arguments into a send buffer. 278 */ 279 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 280 warnx("Cannot create socket for broadcast rpc"); 281 stat = RPC_CANTSEND; 282 goto done_broad; 283 } 284 #ifdef SO_BROADCAST 285 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 286 warnx("Cannot set socket option SO_BROADCAST"); 287 stat = RPC_CANTSEND; 288 goto done_broad; 289 } 290 #endif /* def SO_BROADCAST */ 291 fd.fd = sock; 292 fd.events = POLLIN; 293 nets = getbroadcastnets(addrs, sock, inbuf); 294 memset(&baddr, 0, sizeof (baddr)); 295 baddr.sin_len = sizeof(struct sockaddr_in); 296 baddr.sin_family = AF_INET; 297 baddr.sin_port = htons(PMAPPORT); 298 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 299 (void)gettimeofday(&t, (struct timezone *)0); 300 msg.rm_xid = xid = (u_int32_t)(getpid() ^ t.tv_sec ^ t.tv_usec); 301 t.tv_usec = 0; 302 msg.rm_direction = CALL; 303 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 304 msg.rm_call.cb_prog = PMAPPROG; 305 msg.rm_call.cb_vers = PMAPVERS; 306 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 307 msg.rm_call.cb_cred = unix_auth->ah_cred; 308 msg.rm_call.cb_verf = unix_auth->ah_verf; 309 a.prog = prog; 310 a.vers = vers; 311 a.proc = proc; 312 a.xdr_args = xargs; 313 a.args_ptr = argsp; 314 r.port_ptr = &port; 315 r.xdr_results = xresults; 316 r.results_ptr = resultsp; 317 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 318 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 319 stat = RPC_CANTENCODEARGS; 320 goto done_broad; 321 } 322 outlen = xdr_getpos(xdrs); 323 xdr_destroy(xdrs); 324 /* 325 * Basic loop: broadcast a packet and wait a while for response(s). 326 * The response timeout grows larger per iteration. 327 */ 328 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 329 for (i = 0; i < nets; i++) { 330 baddr.sin_addr = addrs[i]; 331 if (sendto(sock, outbuf, outlen, 0, 332 (struct sockaddr *)(void *)&baddr, 333 sizeof (struct sockaddr)) != outlen) { 334 warnx("Cannot send broadcast packet"); 335 stat = RPC_CANTSEND; 336 goto done_broad; 337 } 338 } 339 if (eachresult == NULL) { 340 stat = RPC_SUCCESS; 341 goto done_broad; 342 } 343 recv_again: 344 milliseconds = (int)(t.tv_sec * 1000 + t.tv_usec / 1000); 345 msg.acpted_rply.ar_verf = _null_auth; 346 msg.acpted_rply.ar_results.where = (caddr_t)(void *)&r; 347 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 348 switch (poll(&fd, 1, milliseconds)) { 349 350 case 0: /* timed out */ 351 stat = RPC_TIMEDOUT; 352 continue; 353 354 case -1: /* some kind of error */ 355 if (errno == EINTR) 356 goto recv_again; 357 warnx("Broadcast poll problem"); 358 stat = RPC_CANTRECV; 359 goto done_broad; 360 361 } /* end of poll results switch */ 362 try_again: 363 fromlen = sizeof(struct sockaddr); 364 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 365 (struct sockaddr *)(void *)&raddr, &fromlen); 366 if (inlen < 0) { 367 if (errno == EINTR) 368 goto try_again; 369 warnx("Cannot receive reply to broadcast"); 370 stat = RPC_CANTRECV; 371 goto done_broad; 372 } 373 if (inlen < sizeof(u_int32_t)) 374 goto recv_again; 375 /* 376 * see if reply transaction id matches sent id. 377 * If so, decode the results. 378 */ 379 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 380 if (xdr_replymsg(xdrs, &msg)) { 381 if ((msg.rm_xid == xid) && 382 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 383 (msg.acpted_rply.ar_stat == SUCCESS)) { 384 raddr.sin_port = htons((u_short)port); 385 done = (*eachresult)(resultsp, &raddr); 386 } 387 /* otherwise, we just ignore the errors ... */ 388 } else { 389 #ifdef notdef 390 /* some kind of deserialization problem ... */ 391 if (msg.rm_xid == xid) 392 fprintf(stderr, "Broadcast deserialization problem"); 393 /* otherwise, just random garbage */ 394 #endif 395 } 396 xdrs->x_op = XDR_FREE; 397 msg.acpted_rply.ar_results.proc = xdr_void; 398 (void)xdr_replymsg(xdrs, &msg); 399 (void)(*xresults)(xdrs, resultsp); 400 xdr_destroy(xdrs); 401 if (done) { 402 stat = RPC_SUCCESS; 403 goto done_broad; 404 } else { 405 goto recv_again; 406 } 407 } 408 stat = RPC_TIMEDOUT; 409 done_broad: 410 (void)close(sock); 411 AUTH_DESTROY(unix_auth); 412 return (stat); 413 } 414