1 /* $NetBSD: pmap_rmt.c,v 1.19 1999/01/31 20:45:31 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 1.19 1999/01/31 20:45:31 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, 94 port_ptr) 95 struct sockaddr_in *addr; 96 u_long prog, vers, proc; 97 xdrproc_t xdrargs, xdrres; 98 caddr_t argsp, resp; 99 struct timeval tout; 100 u_long *port_ptr; 101 { 102 int sock = -1; 103 CLIENT *client; 104 struct rmtcallargs a; 105 struct rmtcallres r; 106 enum clnt_stat stat; 107 108 addr->sin_port = htons(PMAPPORT); 109 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock); 110 if (client != (CLIENT *)NULL) { 111 a.prog = prog; 112 a.vers = vers; 113 a.proc = proc; 114 a.args_ptr = argsp; 115 a.xdr_args = xdrargs; 116 r.port_ptr = port_ptr; 117 r.results_ptr = resp; 118 r.xdr_results = xdrres; 119 stat = CLNT_CALL(client, PMAPPROC_CALLIT, 120 (xdrproc_t)xdr_rmtcall_args, &a, (xdrproc_t)xdr_rmtcallres, 121 &r, tout); 122 CLNT_DESTROY(client); 123 } else { 124 stat = RPC_FAILED; 125 } 126 if (sock != -1) 127 (void)close(sock); 128 addr->sin_port = 0; 129 return (stat); 130 } 131 132 133 /* 134 * XDR remote call arguments 135 * written for XDR_ENCODE direction only 136 */ 137 bool_t 138 xdr_rmtcall_args(xdrs, cap) 139 XDR *xdrs; 140 struct rmtcallargs *cap; 141 { 142 u_int lenposition, argposition, position; 143 144 if (xdr_u_long(xdrs, &(cap->prog)) && 145 xdr_u_long(xdrs, &(cap->vers)) && 146 xdr_u_long(xdrs, &(cap->proc))) { 147 lenposition = XDR_GETPOS(xdrs); 148 if (! xdr_u_long(xdrs, &(cap->arglen))) 149 return (FALSE); 150 argposition = XDR_GETPOS(xdrs); 151 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 152 return (FALSE); 153 position = XDR_GETPOS(xdrs); 154 cap->arglen = (u_long)position - (u_long)argposition; 155 XDR_SETPOS(xdrs, lenposition); 156 if (! xdr_u_long(xdrs, &(cap->arglen))) 157 return (FALSE); 158 XDR_SETPOS(xdrs, position); 159 return (TRUE); 160 } 161 return (FALSE); 162 } 163 164 /* 165 * XDR remote call results 166 * written for XDR_DECODE direction only 167 */ 168 bool_t 169 xdr_rmtcallres(xdrs, crp) 170 XDR *xdrs; 171 struct rmtcallres *crp; 172 { 173 caddr_t port_ptr; 174 175 port_ptr = (caddr_t)(void *)crp->port_ptr; 176 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 177 (xdrproc_t)xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 178 crp->port_ptr = (u_long *)(void *)port_ptr; 179 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 180 } 181 return (FALSE); 182 } 183 184 185 /* 186 * The following is kludged-up support for simple rpc broadcasts. 187 * Someday a large, complicated system will replace these trivial 188 * routines which only support udp/ip . 189 */ 190 191 static int 192 getbroadcastnets(addrs, sock, buf) 193 struct in_addr *addrs; 194 int sock; /* any valid socket will do */ 195 char *buf; /* why allocxate more when we can use existing... */ 196 { 197 struct ifconf ifc; 198 struct ifreq ifreq, *ifr; 199 struct sockaddr_in *sin; 200 char *cp, *cplim; 201 int i = 0; 202 203 ifc.ifc_len = UDPMSGSIZE; 204 ifc.ifc_buf = buf; 205 if (ioctl(sock, SIOCGIFCONF, &ifc) < 0) { 206 warn("getbroadcastnets: ioctl (get interface configuration)"); 207 return (0); 208 } 209 #define max(a, b) (a > b ? a : b) 210 #define size(p) max((p).sa_len, sizeof(p)) 211 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 212 for (cp = buf; cp < cplim; 213 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 214 ifr = (struct ifreq *)(void *)cp; 215 if (ifr->ifr_addr.sa_family != AF_INET) 216 continue; 217 ifreq = *ifr; 218 if (ioctl(sock, SIOCGIFFLAGS, &ifreq) < 0) { 219 warn("getbroadcastnets: ioctl (get interface flags)"); 220 continue; 221 } 222 if ((ifreq.ifr_flags & IFF_BROADCAST) && 223 (ifreq.ifr_flags & IFF_UP)) { 224 sin = (struct sockaddr_in *)(void *)&ifr->ifr_addr; 225 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 226 if (ioctl(sock, SIOCGIFBRDADDR, &ifreq) < 0) { 227 addrs[i++] = 228 inet_makeaddr(inet_netof(sin->sin_addr), 229 (unsigned long)INADDR_ANY); 230 } else { 231 addrs[i++] = ((struct sockaddr_in *)(void *) 232 &ifreq.ifr_addr)->sin_addr; 233 } 234 #else /* 4.2 BSD */ 235 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), 236 INADDR_ANY); 237 #endif 238 } 239 } 240 return (i); 241 } 242 243 typedef bool_t (*resultproc_t) __P((caddr_t, struct sockaddr_in *)); 244 245 enum clnt_stat 246 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 247 u_long prog; /* program number */ 248 u_long vers; /* version number */ 249 u_long proc; /* procedure number */ 250 xdrproc_t xargs; /* xdr routine for args */ 251 caddr_t argsp; /* pointer to args */ 252 xdrproc_t xresults; /* xdr routine for results */ 253 caddr_t resultsp; /* pointer to results */ 254 resultproc_t eachresult; /* call with each result obtained */ 255 { 256 enum clnt_stat stat; 257 AUTH *unix_auth = authunix_create_default(); 258 XDR xdr_stream; 259 XDR *xdrs = &xdr_stream; 260 int inlen, fromlen, nets; 261 size_t outlen; 262 int sock; 263 int on = 1; 264 struct pollfd fd; 265 int i; 266 bool_t done = FALSE; 267 u_int32_t xid; 268 u_long port; 269 struct in_addr addrs[20]; 270 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 271 struct rmtcallargs a; 272 struct rmtcallres r; 273 struct rpc_msg msg; 274 struct timeval t; 275 int milliseconds; 276 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 277 278 /* 279 * initialization: create a socket, a broadcast address, and 280 * preserialize the arguments into a send buffer. 281 */ 282 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 283 warn("Cannot create socket for broadcast rpc"); 284 stat = RPC_CANTSEND; 285 goto done_broad; 286 } 287 #ifdef SO_BROADCAST 288 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 289 warn("Cannot set socket option SO_BROADCAST"); 290 stat = RPC_CANTSEND; 291 goto done_broad; 292 } 293 #endif /* def SO_BROADCAST */ 294 fd.fd = sock; 295 fd.events = POLLIN; 296 nets = getbroadcastnets(addrs, sock, inbuf); 297 memset(&baddr, 0, sizeof (baddr)); 298 baddr.sin_len = sizeof(struct sockaddr_in); 299 baddr.sin_family = AF_INET; 300 baddr.sin_port = htons(PMAPPORT); 301 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 302 (void)gettimeofday(&t, (struct timezone *)0); 303 msg.rm_xid = xid = (u_int32_t)(getpid() ^ t.tv_sec ^ t.tv_usec); 304 t.tv_usec = 0; 305 msg.rm_direction = CALL; 306 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 307 msg.rm_call.cb_prog = PMAPPROG; 308 msg.rm_call.cb_vers = PMAPVERS; 309 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 310 msg.rm_call.cb_cred = unix_auth->ah_cred; 311 msg.rm_call.cb_verf = unix_auth->ah_verf; 312 a.prog = prog; 313 a.vers = vers; 314 a.proc = proc; 315 a.xdr_args = xargs; 316 a.args_ptr = argsp; 317 r.port_ptr = &port; 318 r.xdr_results = xresults; 319 r.results_ptr = resultsp; 320 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 321 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 322 stat = RPC_CANTENCODEARGS; 323 goto done_broad; 324 } 325 outlen = xdr_getpos(xdrs); 326 xdr_destroy(xdrs); 327 /* 328 * Basic loop: broadcast a packet and wait a while for response(s). 329 * The response timeout grows larger per iteration. 330 */ 331 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 332 for (i = 0; i < nets; i++) { 333 baddr.sin_addr = addrs[i]; 334 if (sendto(sock, outbuf, outlen, 0, 335 (struct sockaddr *)(void *)&baddr, 336 sizeof (struct sockaddr)) != outlen) { 337 warn("Cannot send broadcast packet"); 338 stat = RPC_CANTSEND; 339 goto done_broad; 340 } 341 } 342 if (eachresult == NULL) { 343 stat = RPC_SUCCESS; 344 goto done_broad; 345 } 346 recv_again: 347 milliseconds = (int)(t.tv_sec * 1000 + t.tv_usec / 1000); 348 msg.acpted_rply.ar_verf = _null_auth; 349 msg.acpted_rply.ar_results.where = (caddr_t)(void *)&r; 350 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_rmtcallres; 351 switch (poll(&fd, 1, milliseconds)) { 352 353 case 0: /* timed out */ 354 stat = RPC_TIMEDOUT; 355 continue; 356 357 case -1: /* some kind of error */ 358 if (errno == EINTR) 359 goto recv_again; 360 warn("Broadcast poll problem"); 361 stat = RPC_CANTRECV; 362 goto done_broad; 363 364 } /* end of poll results switch */ 365 try_again: 366 fromlen = sizeof(struct sockaddr); 367 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 368 (struct sockaddr *)(void *)&raddr, &fromlen); 369 if (inlen < 0) { 370 if (errno == EINTR) 371 goto try_again; 372 warn("Cannot receive reply to broadcast"); 373 stat = RPC_CANTRECV; 374 goto done_broad; 375 } 376 if (inlen < sizeof(u_int32_t)) 377 goto recv_again; 378 /* 379 * see if reply transaction id matches sent id. 380 * If so, decode the results. 381 */ 382 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 383 if (xdr_replymsg(xdrs, &msg)) { 384 if ((msg.rm_xid == xid) && 385 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 386 (msg.acpted_rply.ar_stat == SUCCESS)) { 387 raddr.sin_port = htons((u_short)port); 388 done = (*eachresult)(resultsp, &raddr); 389 } 390 /* otherwise, we just ignore the errors ... */ 391 } else { 392 #ifdef notdef 393 /* some kind of deserialization problem ... */ 394 if (msg.rm_xid == xid) 395 fprintf(stderr, 396 "Broadcast deserialization problem"); 397 /* otherwise, just random garbage */ 398 #endif 399 } 400 xdrs->x_op = XDR_FREE; 401 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void; 402 (void)xdr_replymsg(xdrs, &msg); 403 (void)(*xresults)(xdrs, resultsp); 404 xdr_destroy(xdrs); 405 if (done) { 406 stat = RPC_SUCCESS; 407 goto done_broad; 408 } else { 409 goto recv_again; 410 } 411 } 412 stat = RPC_TIMEDOUT; 413 done_broad: 414 if (sock != -1) 415 (void)close(sock); 416 AUTH_DESTROY(unix_auth); 417 return (stat); 418 } 419