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 30 #if defined(LIBC_SCCS) && !defined(lint) 31 /*static char *sccsid = "from: @(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";*/ 32 /*static char *sccsid = "from: @(#)pmap_rmt.c 2.2 88/08/01 4.0 RPCSRC";*/ 33 static char *rcsid = "$FreeBSD: src/lib/libc/rpc/pmap_rmt.c,v 1.16.2.1 2002/06/30 23:34:58 iedowse Exp $"; 34 #endif 35 36 /* 37 * pmap_rmt.c 38 * Client interface to pmap rpc service. 39 * remote call and broadcast service 40 * 41 * Copyright (C) 1984, Sun Microsystems, Inc. 42 */ 43 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 #define MAX_BROADCAST_SIZE 1400 58 59 static struct timeval timeout = { 3, 0 }; 60 61 /* 62 * pmapper remote-call-service interface. 63 * This routine is used to call the pmapper remote call service 64 * which will look up a service program in the port maps, and then 65 * remotely call that routine with the given parameters. This allows 66 * programs to do a lookup and call in one step. 67 */ 68 enum clnt_stat 69 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 70 struct sockaddr_in *addr; 71 u_long prog, vers, proc; 72 xdrproc_t xdrargs, xdrres; 73 caddr_t argsp, resp; 74 struct timeval tout; 75 u_long *port_ptr; 76 { 77 int socket = -1; 78 register CLIENT *client; 79 struct rmtcallargs a; 80 struct rmtcallres r; 81 enum clnt_stat stat; 82 83 addr->sin_port = htons(PMAPPORT); 84 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); 85 if (client != (CLIENT *)NULL) { 86 a.prog = prog; 87 a.vers = vers; 88 a.proc = proc; 89 a.args_ptr = argsp; 90 a.xdr_args = xdrargs; 91 r.port_ptr = port_ptr; 92 r.results_ptr = resp; 93 r.xdr_results = xdrres; 94 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 95 xdr_rmtcallres, &r, tout); 96 CLNT_DESTROY(client); 97 } else { 98 stat = RPC_FAILED; 99 } 100 if (socket != -1) 101 (void)_close(socket); 102 addr->sin_port = 0; 103 return (stat); 104 } 105 106 107 /* 108 * XDR remote call arguments 109 * written for XDR_ENCODE direction only 110 */ 111 bool_t 112 xdr_rmtcall_args(xdrs, cap) 113 register XDR *xdrs; 114 register struct rmtcallargs *cap; 115 { 116 u_int lenposition, argposition, position; 117 118 if (xdr_u_long(xdrs, &(cap->prog)) && 119 xdr_u_long(xdrs, &(cap->vers)) && 120 xdr_u_long(xdrs, &(cap->proc))) { 121 lenposition = XDR_GETPOS(xdrs); 122 if (! xdr_u_long(xdrs, &(cap->arglen))) 123 return (FALSE); 124 argposition = XDR_GETPOS(xdrs); 125 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 126 return (FALSE); 127 position = XDR_GETPOS(xdrs); 128 cap->arglen = (u_long)position - (u_long)argposition; 129 XDR_SETPOS(xdrs, lenposition); 130 if (! xdr_u_long(xdrs, &(cap->arglen))) 131 return (FALSE); 132 XDR_SETPOS(xdrs, position); 133 return (TRUE); 134 } 135 return (FALSE); 136 } 137 138 /* 139 * XDR remote call results 140 * written for XDR_DECODE direction only 141 */ 142 bool_t 143 xdr_rmtcallres(xdrs, crp) 144 register XDR *xdrs; 145 register struct rmtcallres *crp; 146 { 147 caddr_t port_ptr; 148 149 port_ptr = (caddr_t)crp->port_ptr; 150 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 151 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 152 crp->port_ptr = (u_long *)port_ptr; 153 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 154 } 155 return (FALSE); 156 } 157 158 159 /* 160 * The following is kludged-up support for simple rpc broadcasts. 161 * Someday a large, complicated system will replace these trivial 162 * routines which only support udp/ip . 163 */ 164 165 static int 166 getbroadcastnets(addrs, sock, buf) 167 struct in_addr *addrs; 168 int sock; /* any valid socket will do */ 169 char *buf; /* why allocxate more when we can use existing... */ 170 { 171 struct ifconf ifc; 172 struct ifreq ifreq, *ifr; 173 struct sockaddr_in *sin; 174 struct in_addr addr; 175 char *cp, *cplim; 176 int n, i = 0; 177 178 ifc.ifc_len = UDPMSGSIZE; 179 ifc.ifc_buf = buf; 180 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 181 perror("broadcast: ioctl (get interface configuration)"); 182 return (0); 183 } 184 #define max(a, b) (a > b ? a : b) 185 #define size(p) max((p).sa_len, sizeof(p)) 186 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 187 for (cp = buf; cp < cplim; 188 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 189 ifr = (struct ifreq *)cp; 190 if (ifr->ifr_addr.sa_family != AF_INET) 191 continue; 192 memcpy(&ifreq, ifr, sizeof(ifreq)); 193 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 194 perror("broadcast: ioctl (get interface flags)"); 195 continue; 196 } 197 if ((ifreq.ifr_flags & IFF_BROADCAST) && 198 (ifreq.ifr_flags & IFF_UP)) { 199 sin = (struct sockaddr_in *)&ifr->ifr_addr; 200 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 201 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 202 addr = 203 inet_makeaddr(inet_netof(sin->sin_addr), 204 INADDR_ANY); 205 } else { 206 addr = ((struct sockaddr_in*) 207 &ifreq.ifr_addr)->sin_addr; 208 } 209 #else /* 4.2 BSD */ 210 addr = inet_makeaddr(inet_netof(sin->sin_addr), 211 INADDR_ANY); 212 #endif 213 for (n=i-1; n>=0; n--) { 214 if (addr.s_addr == addrs[n].s_addr) 215 break; 216 } 217 if (n<0) { 218 addrs[i++] = addr; 219 } 220 } 221 } 222 return (i); 223 } 224 225 typedef bool_t (*resultproc_t)(); 226 227 enum clnt_stat 228 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 229 u_long prog; /* program number */ 230 u_long vers; /* version number */ 231 u_long proc; /* procedure number */ 232 xdrproc_t xargs; /* xdr routine for args */ 233 caddr_t argsp; /* pointer to args */ 234 xdrproc_t xresults; /* xdr routine for results */ 235 caddr_t resultsp; /* pointer to results */ 236 resultproc_t eachresult; /* call with each result obtained */ 237 { 238 enum clnt_stat stat; 239 AUTH *unix_auth = authunix_create_default(); 240 XDR xdr_stream; 241 register XDR *xdrs = &xdr_stream; 242 int outlen, inlen, fromlen, nets; 243 register int sock; 244 int on = 1; 245 fd_set *fds, readfds; 246 register int i; 247 bool_t done = FALSE; 248 register u_long xid; 249 u_long port; 250 struct in_addr addrs[20]; 251 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 252 struct rmtcallargs a; 253 struct rmtcallres r; 254 struct rpc_msg msg; 255 struct timeval t, tv; 256 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 257 static u_int32_t disrupt; 258 259 if (disrupt == 0) 260 disrupt = (u_int32_t)(long)resultsp; 261 262 /* 263 * initialization: create a socket, a broadcast address, and 264 * preserialize the arguments into a send buffer. 265 */ 266 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 267 perror("Cannot create socket for broadcast rpc"); 268 stat = RPC_CANTSEND; 269 goto done_broad; 270 } 271 #ifdef SO_BROADCAST 272 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 273 perror("Cannot set socket option SO_BROADCAST"); 274 stat = RPC_CANTSEND; 275 goto done_broad; 276 } 277 #endif /* def SO_BROADCAST */ 278 if (sock + 1 > FD_SETSIZE) { 279 int bytes = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 280 fds = (fd_set *)malloc(bytes); 281 if (fds == NULL) { 282 stat = RPC_CANTSEND; 283 goto done_broad; 284 } 285 memset(fds, 0, bytes); 286 } else { 287 fds = &readfds; 288 FD_ZERO(fds); 289 } 290 291 nets = getbroadcastnets(addrs, sock, inbuf); 292 memset(&baddr, 0, sizeof (baddr)); 293 baddr.sin_len = sizeof(struct sockaddr_in); 294 baddr.sin_family = AF_INET; 295 baddr.sin_port = htons(PMAPPORT); 296 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 297 (void)gettimeofday(&t, (struct timezone *)0); 298 msg.rm_xid = xid = (++disrupt) ^ getpid() ^ t.tv_sec ^ t.tv_usec; 299 t.tv_usec = 0; 300 msg.rm_direction = CALL; 301 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 302 msg.rm_call.cb_prog = PMAPPROG; 303 msg.rm_call.cb_vers = PMAPVERS; 304 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 305 msg.rm_call.cb_cred = unix_auth->ah_cred; 306 msg.rm_call.cb_verf = unix_auth->ah_verf; 307 a.prog = prog; 308 a.vers = vers; 309 a.proc = proc; 310 a.xdr_args = xargs; 311 a.args_ptr = argsp; 312 r.port_ptr = &port; 313 r.xdr_results = xresults; 314 r.results_ptr = resultsp; 315 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 316 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 317 stat = RPC_CANTENCODEARGS; 318 goto done_broad; 319 } 320 outlen = (int)xdr_getpos(xdrs); 321 xdr_destroy(xdrs); 322 /* 323 * Basic loop: broadcast a packet and wait a while for response(s). 324 * The response timeout grows larger per iteration. 325 * 326 * XXX This will loop about 5 times the stop. If there are 327 * lots of signals being received by the process it will quit 328 * send them all in one quick burst, not paying attention to 329 * the intended function of sending them slowly over half a 330 * minute or so 331 */ 332 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 333 int success = 0; 334 for (i = 0; i < nets; i++) { 335 baddr.sin_addr = addrs[i]; 336 if (sendto(sock, outbuf, outlen, 0, 337 (struct sockaddr *)&baddr, 338 sizeof (struct sockaddr)) == outlen) { 339 success++; 340 } 341 } 342 if (!success) { 343 perror("Cannot send broadcast packet"); 344 stat = RPC_CANTSEND; 345 goto done_broad; 346 } 347 if (eachresult == NULL) { 348 stat = RPC_SUCCESS; 349 goto done_broad; 350 } 351 recv_again: 352 msg.acpted_rply.ar_verf = _null_auth; 353 msg.acpted_rply.ar_results.where = (caddr_t)&r; 354 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 355 /* XXX we know the other bits are still clear */ 356 FD_SET(sock, fds); 357 tv = t; /* for select() that copies back */ 358 switch (select(sock + 1, fds, NULL, NULL, &tv)) { 359 360 case 0: /* timed out */ 361 stat = RPC_TIMEDOUT; 362 continue; 363 364 case -1: /* some kind of error */ 365 if (errno == EINTR) 366 goto recv_again; 367 perror("Broadcast select problem"); 368 stat = RPC_CANTRECV; 369 goto done_broad; 370 371 } /* end of select results switch */ 372 try_again: 373 fromlen = sizeof(struct sockaddr); 374 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 375 (struct sockaddr *)&raddr, &fromlen); 376 if (inlen < 0) { 377 if (errno == EINTR) 378 goto try_again; 379 perror("Cannot receive reply to broadcast"); 380 stat = RPC_CANTRECV; 381 goto done_broad; 382 } 383 if (inlen < sizeof(u_int32_t)) 384 goto recv_again; 385 /* 386 * see if reply transaction id matches sent id. 387 * If so, decode the results. 388 */ 389 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 390 if (xdr_replymsg(xdrs, &msg)) { 391 if ((msg.rm_xid == xid) && 392 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 393 (msg.acpted_rply.ar_stat == SUCCESS)) { 394 raddr.sin_port = htons((u_short)port); 395 done = (*eachresult)(resultsp, &raddr); 396 } 397 /* otherwise, we just ignore the errors ... */ 398 } 399 xdrs->x_op = XDR_FREE; 400 msg.acpted_rply.ar_results.proc = xdr_void; 401 (void)xdr_replymsg(xdrs, &msg); 402 (void)(*xresults)(xdrs, resultsp); 403 xdr_destroy(xdrs); 404 if (done) { 405 stat = RPC_SUCCESS; 406 goto done_broad; 407 } else { 408 goto recv_again; 409 } 410 } 411 done_broad: 412 if (fds != &readfds) 413 free(fds); 414 if (sock >= 0) 415 (void)_close(sock); 416 AUTH_DESTROY(unix_auth); 417 return (stat); 418 } 419 420