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 *rcsid = "$OpenBSD: pmap_rmt.c,v 1.20 2002/09/06 18:35:12 deraadt Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 /* 35 * pmap_rmt.c 36 * Client interface to pmap rpc service. 37 * remote call and broadcast service 38 * 39 * Copyright (C) 1984, Sun Microsystems, Inc. 40 */ 41 42 #include <rpc/rpc.h> 43 #include <rpc/pmap_prot.h> 44 #include <rpc/pmap_clnt.h> 45 #include <rpc/pmap_rmt.h> 46 #include <sys/socket.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 #include <errno.h> 51 #include <string.h> 52 #include <net/if.h> 53 #include <sys/ioctl.h> 54 #include <arpa/inet.h> 55 #include <ifaddrs.h> 56 #define MAX_BROADCAST_SIZE 1400 57 58 static struct timeval timeout = { 3, 0 }; 59 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 sock = -1; 78 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, &sock); 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 (sock != -1) 101 (void)close(sock); 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 XDR *xdrs; 114 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 XDR *xdrs; 145 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 newgetbroadcastnets(addrsp, sock) 167 struct in_addr **addrsp; 168 int sock; /* any valid socket will do */ 169 { 170 struct ifaddrs *ifap, *ifa; 171 struct sockaddr_in *sin; 172 struct in_addr *addrs; 173 int i = 0, n = 0; 174 175 if (getifaddrs(&ifap) != 0) { 176 perror("broadcast: getifaddrs"); 177 return 0; 178 } 179 180 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 181 if (ifa->ifa_addr->sa_family != AF_INET) 182 continue; 183 if ((ifa->ifa_flags & IFF_BROADCAST) && 184 (ifa->ifa_flags & IFF_UP) && 185 ifa->ifa_broadaddr && 186 ifa->ifa_broadaddr->sa_family == AF_INET) { 187 n++; 188 } 189 } 190 191 addrs = (struct in_addr *)malloc(n * sizeof(*addrs)); 192 if (addrs == NULL) { 193 freeifaddrs(ifap); 194 *addrsp = NULL; 195 return 0; 196 } 197 198 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 199 if (ifa->ifa_addr->sa_family != AF_INET) 200 continue; 201 if ((ifa->ifa_flags & IFF_BROADCAST) && 202 (ifa->ifa_flags & IFF_UP) && 203 ifa->ifa_broadaddr && 204 ifa->ifa_broadaddr->sa_family == AF_INET) { 205 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 206 addrs[i++] = sin->sin_addr; 207 } 208 } 209 210 freeifaddrs(ifap); 211 *addrsp = addrs; 212 return i; 213 } 214 215 typedef bool_t (*resultproc_t)(); 216 217 enum clnt_stat 218 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 219 u_long prog; /* program number */ 220 u_long vers; /* version number */ 221 u_long proc; /* procedure number */ 222 xdrproc_t xargs; /* xdr routine for args */ 223 caddr_t argsp; /* pointer to args */ 224 xdrproc_t xresults; /* xdr routine for results */ 225 caddr_t resultsp; /* pointer to results */ 226 resultproc_t eachresult; /* call with each result obtained */ 227 { 228 enum clnt_stat stat; 229 AUTH *unix_auth = authunix_create_default(); 230 XDR xdr_stream; 231 XDR *xdrs = &xdr_stream; 232 int outlen, inlen, nets; 233 socklen_t fromlen; 234 int sock = -1; 235 int on = 1; 236 fd_set *fds = NULL, readfds; 237 int i; 238 bool_t done = FALSE; 239 u_long xid; 240 u_long port; 241 struct in_addr *addrs; 242 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 243 struct rmtcallargs a; 244 struct rmtcallres r; 245 struct rpc_msg msg; 246 struct timeval t; 247 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 248 249 /* 250 * initialization: create a socket, a broadcast address, and 251 * preserialize the arguments into a send buffer. 252 */ 253 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 254 perror("Cannot create socket for broadcast rpc"); 255 stat = RPC_CANTSEND; 256 goto done_broad; 257 } 258 #ifdef SO_BROADCAST 259 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 260 perror("Cannot set socket option SO_BROADCAST"); 261 stat = RPC_CANTSEND; 262 goto done_broad; 263 } 264 #endif /* def SO_BROADCAST */ 265 266 if (sock+1 > FD_SETSIZE) { 267 int bytes = howmany(sock+1, NFDBITS) * sizeof(fd_mask); 268 fds = (fd_set *)malloc(bytes); 269 if (fds == NULL) { 270 stat = RPC_CANTSEND; 271 goto done_broad; 272 } 273 memset(fds, 0, bytes); 274 } else { 275 fds = &readfds; 276 FD_ZERO(fds); 277 } 278 279 nets = newgetbroadcastnets(&addrs, sock); 280 memset(&baddr, 0, sizeof (baddr)); 281 baddr.sin_len = sizeof(struct sockaddr_in); 282 baddr.sin_family = AF_INET; 283 baddr.sin_port = htons(PMAPPORT); 284 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 285 (void)gettimeofday(&t, (struct timezone *)0); 286 msg.rm_xid = xid = arc4random(); 287 t.tv_usec = 0; 288 msg.rm_direction = CALL; 289 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 290 msg.rm_call.cb_prog = PMAPPROG; 291 msg.rm_call.cb_vers = PMAPVERS; 292 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 293 msg.rm_call.cb_cred = unix_auth->ah_cred; 294 msg.rm_call.cb_verf = unix_auth->ah_verf; 295 a.prog = prog; 296 a.vers = vers; 297 a.proc = proc; 298 a.xdr_args = xargs; 299 a.args_ptr = argsp; 300 r.port_ptr = &port; 301 r.xdr_results = xresults; 302 r.results_ptr = resultsp; 303 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 304 if (!xdr_callmsg(xdrs, &msg) || !xdr_rmtcall_args(xdrs, &a)) { 305 stat = RPC_CANTENCODEARGS; 306 goto done_broad; 307 } 308 outlen = (int)xdr_getpos(xdrs); 309 xdr_destroy(xdrs); 310 311 /* 312 * Basic loop: broadcast a packet and wait a while for response(s). 313 * The response timeout grows larger per iteration. 314 * 315 * XXX This will loop about 5 times the stop. If there are 316 * lots of signals being received by the process it will quit 317 * send them all in one quick burst, not paying attention to 318 * the intended function of sending them slowly over half a 319 * minute or so 320 */ 321 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 322 for (i = 0; i < nets; i++) { 323 baddr.sin_addr = addrs[i]; 324 if (sendto(sock, outbuf, outlen, 0, 325 (struct sockaddr *)&baddr, 326 sizeof (struct sockaddr)) != outlen) { 327 perror("Cannot send broadcast packet"); 328 stat = RPC_CANTSEND; 329 goto done_broad; 330 } 331 } 332 if (eachresult == NULL) { 333 stat = RPC_SUCCESS; 334 goto done_broad; 335 } 336 recv_again: 337 msg.acpted_rply.ar_verf = _null_auth; 338 msg.acpted_rply.ar_results.where = (caddr_t)&r; 339 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 340 341 /* XXX we know the other bits are still clear */ 342 FD_SET(sock, fds); 343 switch (select(sock+1, fds, NULL, NULL, &t)) { 344 case 0: /* timed out */ 345 stat = RPC_TIMEDOUT; 346 continue; 347 case -1: /* some kind of error */ 348 if (errno == EINTR) 349 goto recv_again; 350 perror("Broadcast select problem"); 351 stat = RPC_CANTRECV; 352 goto done_broad; 353 } 354 try_again: 355 fromlen = sizeof(struct sockaddr); 356 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 357 (struct sockaddr *)&raddr, &fromlen); 358 if (inlen < 0) { 359 if (errno == EINTR) 360 goto try_again; 361 perror("Cannot receive reply to broadcast"); 362 stat = RPC_CANTRECV; 363 goto done_broad; 364 } 365 if (inlen < sizeof(u_int32_t)) 366 goto recv_again; 367 /* 368 * see if reply transaction id matches sent id. 369 * If so, decode the results. 370 */ 371 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 372 if (xdr_replymsg(xdrs, &msg)) { 373 if ((msg.rm_xid == xid) && 374 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 375 (msg.acpted_rply.ar_stat == SUCCESS)) { 376 raddr.sin_port = htons((u_short)port); 377 done = (*eachresult)(resultsp, &raddr); 378 } 379 /* otherwise, we just ignore the errors ... */ 380 } 381 xdrs->x_op = XDR_FREE; 382 msg.acpted_rply.ar_results.proc = xdr_void; 383 (void)xdr_replymsg(xdrs, &msg); 384 (void)(*xresults)(xdrs, resultsp); 385 xdr_destroy(xdrs); 386 if (done) { 387 stat = RPC_SUCCESS; 388 goto done_broad; 389 } else { 390 goto recv_again; 391 } 392 } 393 done_broad: 394 if (addrs) 395 free(addrs); 396 if (fds != &readfds) 397 free(fds); 398 if (sock >= 0) 399 (void)close(sock); 400 AUTH_DESTROY(unix_auth); 401 return (stat); 402 } 403