1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro 30 * @(#)pmap_rmt.c 2.2 88/08/01 4.0 RPCSRC 31 * $FreeBSD: src/lib/libc/rpc/pmap_rmt.c,v 1.16.2.1 2002/06/30 23:34:58 iedowse Exp $ 32 * $DragonFly: src/lib/libc/rpc/pmap_rmt.c,v 1.4 2005/01/31 22:29:38 dillon Exp $ 33 */ 34 35 /* 36 * pmap_rmt.c 37 * Client interface to pmap rpc service. 38 * remote call and broadcast service 39 * 40 * Copyright (C) 1984, Sun Microsystems, Inc. 41 */ 42 43 #include "namespace.h" 44 #include <rpc/rpc.h> 45 #include <rpc/pmap_prot.h> 46 #include <rpc/pmap_clnt.h> 47 #include <rpc/pmap_rmt.h> 48 #include <sys/socket.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 #include <errno.h> 53 #include <string.h> 54 #include <net/if.h> 55 #include <sys/ioctl.h> 56 #include <arpa/inet.h> 57 #include "un-namespace.h" 58 59 #define MAX_BROADCAST_SIZE 1400 60 61 static struct timeval timeout = { 3, 0 }; 62 63 /* 64 * pmapper remote-call-service interface. 65 * This routine is used to call the pmapper remote call service 66 * which will look up a service program in the port maps, and then 67 * remotely call that routine with the given parameters. This allows 68 * programs to do a lookup and call in one step. 69 */ 70 enum clnt_stat 71 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 72 struct sockaddr_in *addr; 73 u_long prog, vers, proc; 74 xdrproc_t xdrargs, xdrres; 75 caddr_t argsp, resp; 76 struct timeval tout; 77 u_long *port_ptr; 78 { 79 int socket = -1; 80 CLIENT *client; 81 struct rmtcallargs a; 82 struct rmtcallres r; 83 enum clnt_stat stat; 84 85 addr->sin_port = htons(PMAPPORT); 86 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); 87 if (client != (CLIENT *)NULL) { 88 a.prog = prog; 89 a.vers = vers; 90 a.proc = proc; 91 a.args_ptr = argsp; 92 a.xdr_args = xdrargs; 93 r.port_ptr = port_ptr; 94 r.results_ptr = resp; 95 r.xdr_results = xdrres; 96 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 97 xdr_rmtcallres, &r, tout); 98 CLNT_DESTROY(client); 99 } else { 100 stat = RPC_FAILED; 101 } 102 if (socket != -1) 103 (void)_close(socket); 104 addr->sin_port = 0; 105 return (stat); 106 } 107 108 109 /* 110 * XDR remote call arguments 111 * written for XDR_ENCODE direction only 112 */ 113 bool_t 114 xdr_rmtcall_args(xdrs, cap) 115 XDR *xdrs; 116 struct rmtcallargs *cap; 117 { 118 u_int lenposition, argposition, position; 119 120 if (xdr_u_long(xdrs, &(cap->prog)) && 121 xdr_u_long(xdrs, &(cap->vers)) && 122 xdr_u_long(xdrs, &(cap->proc))) { 123 lenposition = XDR_GETPOS(xdrs); 124 if (! xdr_u_long(xdrs, &(cap->arglen))) 125 return (FALSE); 126 argposition = XDR_GETPOS(xdrs); 127 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 128 return (FALSE); 129 position = XDR_GETPOS(xdrs); 130 cap->arglen = (u_long)position - (u_long)argposition; 131 XDR_SETPOS(xdrs, lenposition); 132 if (! xdr_u_long(xdrs, &(cap->arglen))) 133 return (FALSE); 134 XDR_SETPOS(xdrs, position); 135 return (TRUE); 136 } 137 return (FALSE); 138 } 139 140 /* 141 * XDR remote call results 142 * written for XDR_DECODE direction only 143 */ 144 bool_t 145 xdr_rmtcallres(xdrs, crp) 146 XDR *xdrs; 147 struct rmtcallres *crp; 148 { 149 caddr_t port_ptr; 150 151 port_ptr = (caddr_t)crp->port_ptr; 152 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 153 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 154 crp->port_ptr = (u_long *)port_ptr; 155 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 156 } 157 return (FALSE); 158 } 159 160 161 /* 162 * The following is kludged-up support for simple rpc broadcasts. 163 * Someday a large, complicated system will replace these trivial 164 * routines which only support udp/ip . 165 */ 166 167 static int 168 getbroadcastnets(addrs, sock, buf) 169 struct in_addr *addrs; 170 int sock; /* any valid socket will do */ 171 char *buf; /* why allocxate more when we can use existing... */ 172 { 173 struct ifconf ifc; 174 struct ifreq ifreq, *ifr; 175 struct sockaddr_in *sin; 176 struct in_addr addr; 177 char *cp, *cplim; 178 int n, i = 0; 179 180 ifc.ifc_len = UDPMSGSIZE; 181 ifc.ifc_buf = buf; 182 if (_ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 183 perror("broadcast: ioctl (get interface configuration)"); 184 return (0); 185 } 186 #define max(a, b) (a > b ? a : b) 187 #define size(p) max((p).sa_len, sizeof(p)) 188 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 189 for (cp = buf; cp < cplim; 190 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 191 ifr = (struct ifreq *)cp; 192 if (ifr->ifr_addr.sa_family != AF_INET) 193 continue; 194 memcpy(&ifreq, ifr, sizeof(ifreq)); 195 if (_ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 196 perror("broadcast: ioctl (get interface flags)"); 197 continue; 198 } 199 if ((ifreq.ifr_flags & IFF_BROADCAST) && 200 (ifreq.ifr_flags & IFF_UP)) { 201 sin = (struct sockaddr_in *)&ifr->ifr_addr; 202 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 203 if (_ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 204 addr = 205 inet_makeaddr(inet_netof(sin->sin_addr), 206 INADDR_ANY); 207 } else { 208 addr = ((struct sockaddr_in*) 209 &ifreq.ifr_addr)->sin_addr; 210 } 211 #else /* 4.2 BSD */ 212 addr = inet_makeaddr(inet_netof(sin->sin_addr), 213 INADDR_ANY); 214 #endif 215 for (n=i-1; n>=0; n--) { 216 if (addr.s_addr == addrs[n].s_addr) 217 break; 218 } 219 if (n<0) { 220 addrs[i++] = addr; 221 } 222 } 223 } 224 return (i); 225 } 226 227 typedef bool_t (*resultproc_t)(); 228 229 enum clnt_stat 230 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 231 u_long prog; /* program number */ 232 u_long vers; /* version number */ 233 u_long proc; /* procedure number */ 234 xdrproc_t xargs; /* xdr routine for args */ 235 caddr_t argsp; /* pointer to args */ 236 xdrproc_t xresults; /* xdr routine for results */ 237 caddr_t resultsp; /* pointer to results */ 238 resultproc_t eachresult; /* call with each result obtained */ 239 { 240 enum clnt_stat stat; 241 AUTH *unix_auth = authunix_create_default(); 242 XDR xdr_stream; 243 XDR *xdrs = &xdr_stream; 244 int outlen, inlen, fromlen, nets; 245 int sock; 246 int on = 1; 247 fd_set *fds, readfds; 248 int i; 249 bool_t done = FALSE; 250 u_long xid; 251 u_long port; 252 struct in_addr addrs[20]; 253 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 254 struct rmtcallargs a; 255 struct rmtcallres r; 256 struct rpc_msg msg; 257 struct timeval t, tv; 258 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 259 static u_int32_t disrupt; 260 261 if (disrupt == 0) 262 disrupt = (u_int32_t)(long)resultsp; 263 264 /* 265 * initialization: create a socket, a broadcast address, and 266 * preserialize the arguments into a send buffer. 267 */ 268 if ((sock = _socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 269 perror("Cannot create socket for broadcast rpc"); 270 stat = RPC_CANTSEND; 271 goto done_broad; 272 } 273 #ifdef SO_BROADCAST 274 if (_setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 275 perror("Cannot set socket option SO_BROADCAST"); 276 stat = RPC_CANTSEND; 277 goto done_broad; 278 } 279 #endif /* def SO_BROADCAST */ 280 if (sock + 1 > FD_SETSIZE) { 281 int bytes = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 282 fds = (fd_set *)malloc(bytes); 283 if (fds == NULL) { 284 stat = RPC_CANTSEND; 285 goto done_broad; 286 } 287 memset(fds, 0, bytes); 288 } else { 289 fds = &readfds; 290 FD_ZERO(fds); 291 } 292 293 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 = (++disrupt) ^ 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 = (int)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 * XXX This will loop about 5 times the stop. If there are 329 * lots of signals being received by the process it will quit 330 * send them all in one quick burst, not paying attention to 331 * the intended function of sending them slowly over half a 332 * minute or so 333 */ 334 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 335 int success = 0; 336 for (i = 0; i < nets; i++) { 337 baddr.sin_addr = addrs[i]; 338 if (_sendto(sock, outbuf, outlen, 0, 339 (struct sockaddr *)&baddr, 340 sizeof (struct sockaddr)) == outlen) { 341 success++; 342 } 343 } 344 if (!success) { 345 perror("Cannot send broadcast packet"); 346 stat = RPC_CANTSEND; 347 goto done_broad; 348 } 349 if (eachresult == NULL) { 350 stat = RPC_SUCCESS; 351 goto done_broad; 352 } 353 recv_again: 354 msg.acpted_rply.ar_verf = _null_auth; 355 msg.acpted_rply.ar_results.where = (caddr_t)&r; 356 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 357 /* XXX we know the other bits are still clear */ 358 FD_SET(sock, fds); 359 tv = t; /* for _select() that copies back */ 360 switch (_select(sock + 1, fds, NULL, NULL, &tv)) { 361 362 case 0: /* timed out */ 363 stat = RPC_TIMEDOUT; 364 continue; 365 366 case -1: /* some kind of error */ 367 if (errno == EINTR) 368 goto recv_again; 369 perror("Broadcast select problem"); 370 stat = RPC_CANTRECV; 371 goto done_broad; 372 373 } /* end of select results switch */ 374 try_again: 375 fromlen = sizeof(struct sockaddr); 376 inlen = _recvfrom(sock, inbuf, UDPMSGSIZE, 0, 377 (struct sockaddr *)&raddr, &fromlen); 378 if (inlen < 0) { 379 if (errno == EINTR) 380 goto try_again; 381 perror("Cannot receive reply to broadcast"); 382 stat = RPC_CANTRECV; 383 goto done_broad; 384 } 385 if (inlen < sizeof(u_int32_t)) 386 goto recv_again; 387 /* 388 * see if reply transaction id matches sent id. 389 * If so, decode the results. 390 */ 391 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 392 if (xdr_replymsg(xdrs, &msg)) { 393 if ((msg.rm_xid == xid) && 394 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 395 (msg.acpted_rply.ar_stat == SUCCESS)) { 396 raddr.sin_port = htons((u_short)port); 397 done = (*eachresult)(resultsp, &raddr); 398 } 399 /* otherwise, we just ignore the errors ... */ 400 } 401 xdrs->x_op = XDR_FREE; 402 msg.acpted_rply.ar_results.proc = xdr_void; 403 (void)xdr_replymsg(xdrs, &msg); 404 (void)(*xresults)(xdrs, resultsp); 405 xdr_destroy(xdrs); 406 if (done) { 407 stat = RPC_SUCCESS; 408 goto done_broad; 409 } else { 410 goto recv_again; 411 } 412 } 413 done_broad: 414 if (fds != &readfds) 415 free(fds); 416 if (sock >= 0) 417 (void)_close(sock); 418 AUTH_DESTROY(unix_auth); 419 return (stat); 420 } 421 422