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 1.2 2003/06/17 04:26:45 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 <rpc/rpc.h> 44 #include <rpc/pmap_prot.h> 45 #include <rpc/pmap_clnt.h> 46 #include <rpc/pmap_rmt.h> 47 #include <sys/socket.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 #include <errno.h> 52 #include <string.h> 53 #include <net/if.h> 54 #include <sys/ioctl.h> 55 #include <arpa/inet.h> 56 #define MAX_BROADCAST_SIZE 1400 57 58 static struct timeval timeout = { 3, 0 }; 59 60 /* 61 * pmapper remote-call-service interface. 62 * This routine is used to call the pmapper remote call service 63 * which will look up a service program in the port maps, and then 64 * remotely call that routine with the given parameters. This allows 65 * programs to do a lookup and call in one step. 66 */ 67 enum clnt_stat 68 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 69 struct sockaddr_in *addr; 70 u_long prog, vers, proc; 71 xdrproc_t xdrargs, xdrres; 72 caddr_t argsp, resp; 73 struct timeval tout; 74 u_long *port_ptr; 75 { 76 int socket = -1; 77 register CLIENT *client; 78 struct rmtcallargs a; 79 struct rmtcallres r; 80 enum clnt_stat stat; 81 82 addr->sin_port = htons(PMAPPORT); 83 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); 84 if (client != (CLIENT *)NULL) { 85 a.prog = prog; 86 a.vers = vers; 87 a.proc = proc; 88 a.args_ptr = argsp; 89 a.xdr_args = xdrargs; 90 r.port_ptr = port_ptr; 91 r.results_ptr = resp; 92 r.xdr_results = xdrres; 93 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 94 xdr_rmtcallres, &r, tout); 95 CLNT_DESTROY(client); 96 } else { 97 stat = RPC_FAILED; 98 } 99 if (socket != -1) 100 (void)_close(socket); 101 addr->sin_port = 0; 102 return (stat); 103 } 104 105 106 /* 107 * XDR remote call arguments 108 * written for XDR_ENCODE direction only 109 */ 110 bool_t 111 xdr_rmtcall_args(xdrs, cap) 112 register XDR *xdrs; 113 register struct rmtcallargs *cap; 114 { 115 u_int lenposition, argposition, position; 116 117 if (xdr_u_long(xdrs, &(cap->prog)) && 118 xdr_u_long(xdrs, &(cap->vers)) && 119 xdr_u_long(xdrs, &(cap->proc))) { 120 lenposition = XDR_GETPOS(xdrs); 121 if (! xdr_u_long(xdrs, &(cap->arglen))) 122 return (FALSE); 123 argposition = XDR_GETPOS(xdrs); 124 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 125 return (FALSE); 126 position = XDR_GETPOS(xdrs); 127 cap->arglen = (u_long)position - (u_long)argposition; 128 XDR_SETPOS(xdrs, lenposition); 129 if (! xdr_u_long(xdrs, &(cap->arglen))) 130 return (FALSE); 131 XDR_SETPOS(xdrs, position); 132 return (TRUE); 133 } 134 return (FALSE); 135 } 136 137 /* 138 * XDR remote call results 139 * written for XDR_DECODE direction only 140 */ 141 bool_t 142 xdr_rmtcallres(xdrs, crp) 143 register XDR *xdrs; 144 register struct rmtcallres *crp; 145 { 146 caddr_t port_ptr; 147 148 port_ptr = (caddr_t)crp->port_ptr; 149 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 150 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 151 crp->port_ptr = (u_long *)port_ptr; 152 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 153 } 154 return (FALSE); 155 } 156 157 158 /* 159 * The following is kludged-up support for simple rpc broadcasts. 160 * Someday a large, complicated system will replace these trivial 161 * routines which only support udp/ip . 162 */ 163 164 static int 165 getbroadcastnets(addrs, sock, buf) 166 struct in_addr *addrs; 167 int sock; /* any valid socket will do */ 168 char *buf; /* why allocxate more when we can use existing... */ 169 { 170 struct ifconf ifc; 171 struct ifreq ifreq, *ifr; 172 struct sockaddr_in *sin; 173 struct in_addr addr; 174 char *cp, *cplim; 175 int n, i = 0; 176 177 ifc.ifc_len = UDPMSGSIZE; 178 ifc.ifc_buf = buf; 179 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 180 perror("broadcast: ioctl (get interface configuration)"); 181 return (0); 182 } 183 #define max(a, b) (a > b ? a : b) 184 #define size(p) max((p).sa_len, sizeof(p)) 185 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 186 for (cp = buf; cp < cplim; 187 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 188 ifr = (struct ifreq *)cp; 189 if (ifr->ifr_addr.sa_family != AF_INET) 190 continue; 191 memcpy(&ifreq, ifr, sizeof(ifreq)); 192 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 193 perror("broadcast: ioctl (get interface flags)"); 194 continue; 195 } 196 if ((ifreq.ifr_flags & IFF_BROADCAST) && 197 (ifreq.ifr_flags & IFF_UP)) { 198 sin = (struct sockaddr_in *)&ifr->ifr_addr; 199 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 200 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 201 addr = 202 inet_makeaddr(inet_netof(sin->sin_addr), 203 INADDR_ANY); 204 } else { 205 addr = ((struct sockaddr_in*) 206 &ifreq.ifr_addr)->sin_addr; 207 } 208 #else /* 4.2 BSD */ 209 addr = inet_makeaddr(inet_netof(sin->sin_addr), 210 INADDR_ANY); 211 #endif 212 for (n=i-1; n>=0; n--) { 213 if (addr.s_addr == addrs[n].s_addr) 214 break; 215 } 216 if (n<0) { 217 addrs[i++] = addr; 218 } 219 } 220 } 221 return (i); 222 } 223 224 typedef bool_t (*resultproc_t)(); 225 226 enum clnt_stat 227 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 228 u_long prog; /* program number */ 229 u_long vers; /* version number */ 230 u_long proc; /* procedure number */ 231 xdrproc_t xargs; /* xdr routine for args */ 232 caddr_t argsp; /* pointer to args */ 233 xdrproc_t xresults; /* xdr routine for results */ 234 caddr_t resultsp; /* pointer to results */ 235 resultproc_t eachresult; /* call with each result obtained */ 236 { 237 enum clnt_stat stat; 238 AUTH *unix_auth = authunix_create_default(); 239 XDR xdr_stream; 240 register XDR *xdrs = &xdr_stream; 241 int outlen, inlen, fromlen, nets; 242 register int sock; 243 int on = 1; 244 fd_set *fds, readfds; 245 register int i; 246 bool_t done = FALSE; 247 register u_long xid; 248 u_long port; 249 struct in_addr addrs[20]; 250 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 251 struct rmtcallargs a; 252 struct rmtcallres r; 253 struct rpc_msg msg; 254 struct timeval t, tv; 255 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 256 static u_int32_t disrupt; 257 258 if (disrupt == 0) 259 disrupt = (u_int32_t)(long)resultsp; 260 261 /* 262 * initialization: create a socket, a broadcast address, and 263 * preserialize the arguments into a send buffer. 264 */ 265 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 266 perror("Cannot create socket for broadcast rpc"); 267 stat = RPC_CANTSEND; 268 goto done_broad; 269 } 270 #ifdef SO_BROADCAST 271 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 272 perror("Cannot set socket option SO_BROADCAST"); 273 stat = RPC_CANTSEND; 274 goto done_broad; 275 } 276 #endif /* def SO_BROADCAST */ 277 if (sock + 1 > FD_SETSIZE) { 278 int bytes = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 279 fds = (fd_set *)malloc(bytes); 280 if (fds == NULL) { 281 stat = RPC_CANTSEND; 282 goto done_broad; 283 } 284 memset(fds, 0, bytes); 285 } else { 286 fds = &readfds; 287 FD_ZERO(fds); 288 } 289 290 nets = getbroadcastnets(addrs, sock, inbuf); 291 memset(&baddr, 0, sizeof (baddr)); 292 baddr.sin_len = sizeof(struct sockaddr_in); 293 baddr.sin_family = AF_INET; 294 baddr.sin_port = htons(PMAPPORT); 295 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 296 (void)gettimeofday(&t, (struct timezone *)0); 297 msg.rm_xid = xid = (++disrupt) ^ getpid() ^ t.tv_sec ^ t.tv_usec; 298 t.tv_usec = 0; 299 msg.rm_direction = CALL; 300 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 301 msg.rm_call.cb_prog = PMAPPROG; 302 msg.rm_call.cb_vers = PMAPVERS; 303 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 304 msg.rm_call.cb_cred = unix_auth->ah_cred; 305 msg.rm_call.cb_verf = unix_auth->ah_verf; 306 a.prog = prog; 307 a.vers = vers; 308 a.proc = proc; 309 a.xdr_args = xargs; 310 a.args_ptr = argsp; 311 r.port_ptr = &port; 312 r.xdr_results = xresults; 313 r.results_ptr = resultsp; 314 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 315 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 316 stat = RPC_CANTENCODEARGS; 317 goto done_broad; 318 } 319 outlen = (int)xdr_getpos(xdrs); 320 xdr_destroy(xdrs); 321 /* 322 * Basic loop: broadcast a packet and wait a while for response(s). 323 * The response timeout grows larger per iteration. 324 * 325 * XXX This will loop about 5 times the stop. If there are 326 * lots of signals being received by the process it will quit 327 * send them all in one quick burst, not paying attention to 328 * the intended function of sending them slowly over half a 329 * minute or so 330 */ 331 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 332 int success = 0; 333 for (i = 0; i < nets; i++) { 334 baddr.sin_addr = addrs[i]; 335 if (sendto(sock, outbuf, outlen, 0, 336 (struct sockaddr *)&baddr, 337 sizeof (struct sockaddr)) == outlen) { 338 success++; 339 } 340 } 341 if (!success) { 342 perror("Cannot send broadcast packet"); 343 stat = RPC_CANTSEND; 344 goto done_broad; 345 } 346 if (eachresult == NULL) { 347 stat = RPC_SUCCESS; 348 goto done_broad; 349 } 350 recv_again: 351 msg.acpted_rply.ar_verf = _null_auth; 352 msg.acpted_rply.ar_results.where = (caddr_t)&r; 353 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 354 /* XXX we know the other bits are still clear */ 355 FD_SET(sock, fds); 356 tv = t; /* for select() that copies back */ 357 switch (select(sock + 1, fds, NULL, NULL, &tv)) { 358 359 case 0: /* timed out */ 360 stat = RPC_TIMEDOUT; 361 continue; 362 363 case -1: /* some kind of error */ 364 if (errno == EINTR) 365 goto recv_again; 366 perror("Broadcast select problem"); 367 stat = RPC_CANTRECV; 368 goto done_broad; 369 370 } /* end of select results switch */ 371 try_again: 372 fromlen = sizeof(struct sockaddr); 373 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 374 (struct sockaddr *)&raddr, &fromlen); 375 if (inlen < 0) { 376 if (errno == EINTR) 377 goto try_again; 378 perror("Cannot receive reply to broadcast"); 379 stat = RPC_CANTRECV; 380 goto done_broad; 381 } 382 if (inlen < sizeof(u_int32_t)) 383 goto recv_again; 384 /* 385 * see if reply transaction id matches sent id. 386 * If so, decode the results. 387 */ 388 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 389 if (xdr_replymsg(xdrs, &msg)) { 390 if ((msg.rm_xid == xid) && 391 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 392 (msg.acpted_rply.ar_stat == SUCCESS)) { 393 raddr.sin_port = htons((u_short)port); 394 done = (*eachresult)(resultsp, &raddr); 395 } 396 /* otherwise, we just ignore the errors ... */ 397 } 398 xdrs->x_op = XDR_FREE; 399 msg.acpted_rply.ar_results.proc = xdr_void; 400 (void)xdr_replymsg(xdrs, &msg); 401 (void)(*xresults)(xdrs, resultsp); 402 xdr_destroy(xdrs); 403 if (done) { 404 stat = RPC_SUCCESS; 405 goto done_broad; 406 } else { 407 goto recv_again; 408 } 409 } 410 done_broad: 411 if (fds != &readfds) 412 free(fds); 413 if (sock >= 0) 414 (void)_close(sock); 415 AUTH_DESTROY(unix_auth); 416 return (stat); 417 } 418 419