1 /* $NetBSD: pmap_rmt.c,v 1.10 1997/07/21 14:08:34 jtc 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 1.10 1997/07/21 14:08:34 jtc 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 #include <sys/types.h> 52 #include <sys/poll.h> 53 54 #include <rpc/rpc.h> 55 #include <rpc/pmap_prot.h> 56 #include <rpc/pmap_clnt.h> 57 #include <rpc/pmap_rmt.h> 58 #include <sys/socket.h> 59 #include <stdio.h> 60 #include <errno.h> 61 #include <string.h> 62 #include <unistd.h> 63 #include <net/if.h> 64 #include <sys/ioctl.h> 65 #include <arpa/inet.h> 66 67 #ifdef __weak_alias 68 __weak_alias(clnt_broadcast,_clnt_broadcast); 69 __weak_alias(pmap_rmtcall,_pmap_rmtcall); 70 __weak_alias(xdr_rmtcall_args,_xdr_rmtcall_args); 71 __weak_alias(xdr_rmtcallres,_xdr_rmtcallres); 72 #endif 73 74 #define MAX_BROADCAST_SIZE 1400 75 76 static int getbroadcastnets __P((struct in_addr *, int, char *)); 77 78 static struct timeval timeout = { 3, 0 }; 79 80 /* 81 * pmapper remote-call-service interface. 82 * This routine is used to call the pmapper remote call service 83 * which will look up a service program in the port maps, and then 84 * remotely call that routine with the given parameters. This allows 85 * programs to do a lookup and call in one step. 86 */ 87 enum clnt_stat 88 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 89 struct sockaddr_in *addr; 90 u_long prog, vers, proc; 91 xdrproc_t xdrargs, xdrres; 92 caddr_t argsp, resp; 93 struct timeval tout; 94 u_long *port_ptr; 95 { 96 int socket = -1; 97 register CLIENT *client; 98 struct rmtcallargs a; 99 struct rmtcallres r; 100 enum clnt_stat stat; 101 102 addr->sin_port = htons(PMAPPORT); 103 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); 104 if (client != (CLIENT *)NULL) { 105 a.prog = prog; 106 a.vers = vers; 107 a.proc = proc; 108 a.args_ptr = argsp; 109 a.xdr_args = xdrargs; 110 r.port_ptr = port_ptr; 111 r.results_ptr = resp; 112 r.xdr_results = xdrres; 113 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 114 xdr_rmtcallres, &r, tout); 115 CLNT_DESTROY(client); 116 } else { 117 stat = RPC_FAILED; 118 } 119 (void)close(socket); 120 addr->sin_port = 0; 121 return (stat); 122 } 123 124 125 /* 126 * XDR remote call arguments 127 * written for XDR_ENCODE direction only 128 */ 129 bool_t 130 xdr_rmtcall_args(xdrs, cap) 131 register XDR *xdrs; 132 register struct rmtcallargs *cap; 133 { 134 u_int lenposition, argposition, position; 135 136 if (xdr_u_long(xdrs, &(cap->prog)) && 137 xdr_u_long(xdrs, &(cap->vers)) && 138 xdr_u_long(xdrs, &(cap->proc))) { 139 lenposition = XDR_GETPOS(xdrs); 140 if (! xdr_u_long(xdrs, &(cap->arglen))) 141 return (FALSE); 142 argposition = XDR_GETPOS(xdrs); 143 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 144 return (FALSE); 145 position = XDR_GETPOS(xdrs); 146 cap->arglen = (u_long)position - (u_long)argposition; 147 XDR_SETPOS(xdrs, lenposition); 148 if (! xdr_u_long(xdrs, &(cap->arglen))) 149 return (FALSE); 150 XDR_SETPOS(xdrs, position); 151 return (TRUE); 152 } 153 return (FALSE); 154 } 155 156 /* 157 * XDR remote call results 158 * written for XDR_DECODE direction only 159 */ 160 bool_t 161 xdr_rmtcallres(xdrs, crp) 162 register XDR *xdrs; 163 register struct rmtcallres *crp; 164 { 165 caddr_t port_ptr; 166 167 port_ptr = (caddr_t)crp->port_ptr; 168 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 169 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 170 crp->port_ptr = (u_long *)port_ptr; 171 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 172 } 173 return (FALSE); 174 } 175 176 177 /* 178 * The following is kludged-up support for simple rpc broadcasts. 179 * Someday a large, complicated system will replace these trivial 180 * routines which only support udp/ip . 181 */ 182 183 static int 184 getbroadcastnets(addrs, sock, buf) 185 struct in_addr *addrs; 186 int sock; /* any valid socket will do */ 187 char *buf; /* why allocxate more when we can use existing... */ 188 { 189 struct ifconf ifc; 190 struct ifreq ifreq, *ifr; 191 struct sockaddr_in *sin; 192 char *cp, *cplim; 193 int i = 0; 194 195 ifc.ifc_len = UDPMSGSIZE; 196 ifc.ifc_buf = buf; 197 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 198 perror("broadcast: ioctl (get interface configuration)"); 199 return (0); 200 } 201 #define max(a, b) (a > b ? a : b) 202 #define size(p) max((p).sa_len, sizeof(p)) 203 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 204 for (cp = buf; cp < cplim; 205 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 206 ifr = (struct ifreq *)cp; 207 if (ifr->ifr_addr.sa_family != AF_INET) 208 continue; 209 ifreq = *ifr; 210 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 211 perror("broadcast: ioctl (get interface flags)"); 212 continue; 213 } 214 if ((ifreq.ifr_flags & IFF_BROADCAST) && 215 (ifreq.ifr_flags & IFF_UP)) { 216 sin = (struct sockaddr_in *)&ifr->ifr_addr; 217 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 218 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 219 addrs[i++] = 220 inet_makeaddr(inet_netof(sin->sin_addr), 221 INADDR_ANY); 222 } else { 223 addrs[i++] = ((struct sockaddr_in*) 224 &ifreq.ifr_addr)->sin_addr; 225 } 226 #else /* 4.2 BSD */ 227 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), 228 INADDR_ANY); 229 #endif 230 } 231 } 232 return (i); 233 } 234 235 typedef bool_t (*resultproc_t) __P((caddr_t, struct sockaddr_in *)); 236 237 enum clnt_stat 238 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 239 u_long prog; /* program number */ 240 u_long vers; /* version number */ 241 u_long proc; /* procedure number */ 242 xdrproc_t xargs; /* xdr routine for args */ 243 caddr_t argsp; /* pointer to args */ 244 xdrproc_t xresults; /* xdr routine for results */ 245 caddr_t resultsp; /* pointer to results */ 246 resultproc_t eachresult; /* call with each result obtained */ 247 { 248 enum clnt_stat stat; 249 AUTH *unix_auth = authunix_create_default(); 250 XDR xdr_stream; 251 register XDR *xdrs = &xdr_stream; 252 int outlen, inlen, fromlen, nets; 253 register int sock; 254 int on = 1; 255 struct pollfd fd; 256 register int i; 257 bool_t done = FALSE; 258 register u_long xid; 259 u_long port; 260 struct in_addr addrs[20]; 261 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 262 struct rmtcallargs a; 263 struct rmtcallres r; 264 struct rpc_msg msg; 265 struct timeval t; 266 int milliseconds; 267 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 268 269 /* 270 * initialization: create a socket, a broadcast address, and 271 * preserialize the arguments into a send buffer. 272 */ 273 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 274 perror("Cannot create socket for broadcast rpc"); 275 stat = RPC_CANTSEND; 276 goto done_broad; 277 } 278 #ifdef SO_BROADCAST 279 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 280 perror("Cannot set socket option SO_BROADCAST"); 281 stat = RPC_CANTSEND; 282 goto done_broad; 283 } 284 #endif /* def SO_BROADCAST */ 285 fd.fd = sock; 286 fd.events = POLLIN; 287 nets = getbroadcastnets(addrs, sock, inbuf); 288 memset(&baddr, 0, sizeof (baddr)); 289 baddr.sin_len = sizeof(struct sockaddr_in); 290 baddr.sin_family = AF_INET; 291 baddr.sin_port = htons(PMAPPORT); 292 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 293 /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */ 294 (void)gettimeofday(&t, (struct timezone *)0); 295 msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec; 296 t.tv_usec = 0; 297 msg.rm_direction = CALL; 298 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 299 msg.rm_call.cb_prog = PMAPPROG; 300 msg.rm_call.cb_vers = PMAPVERS; 301 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 302 msg.rm_call.cb_cred = unix_auth->ah_cred; 303 msg.rm_call.cb_verf = unix_auth->ah_verf; 304 a.prog = prog; 305 a.vers = vers; 306 a.proc = proc; 307 a.xdr_args = xargs; 308 a.args_ptr = argsp; 309 r.port_ptr = &port; 310 r.xdr_results = xresults; 311 r.results_ptr = resultsp; 312 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 313 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 314 stat = RPC_CANTENCODEARGS; 315 goto done_broad; 316 } 317 outlen = (int)xdr_getpos(xdrs); 318 xdr_destroy(xdrs); 319 /* 320 * Basic loop: broadcast a packet and wait a while for response(s). 321 * The response timeout grows larger per iteration. 322 */ 323 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 324 for (i = 0; i < nets; i++) { 325 baddr.sin_addr = addrs[i]; 326 if (sendto(sock, outbuf, outlen, 0, 327 (struct sockaddr *)&baddr, 328 sizeof (struct sockaddr)) != outlen) { 329 perror("Cannot send broadcast packet"); 330 stat = RPC_CANTSEND; 331 goto done_broad; 332 } 333 } 334 if (eachresult == NULL) { 335 stat = RPC_SUCCESS; 336 goto done_broad; 337 } 338 recv_again: 339 milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000; 340 msg.acpted_rply.ar_verf = _null_auth; 341 msg.acpted_rply.ar_results.where = (caddr_t)&r; 342 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 343 switch (poll(&fd, 1, milliseconds)) { 344 345 case 0: /* timed out */ 346 stat = RPC_TIMEDOUT; 347 continue; 348 349 case -1: /* some kind of error */ 350 if (errno == EINTR) 351 goto recv_again; 352 perror("Broadcast poll problem"); 353 stat = RPC_CANTRECV; 354 goto done_broad; 355 356 } /* end of poll results switch */ 357 try_again: 358 fromlen = sizeof(struct sockaddr); 359 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 360 (struct sockaddr *)&raddr, &fromlen); 361 if (inlen < 0) { 362 if (errno == EINTR) 363 goto try_again; 364 perror("Cannot receive reply to broadcast"); 365 stat = RPC_CANTRECV; 366 goto done_broad; 367 } 368 if (inlen < sizeof(u_int32_t)) 369 goto recv_again; 370 /* 371 * see if reply transaction id matches sent id. 372 * If so, decode the results. 373 */ 374 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 375 if (xdr_replymsg(xdrs, &msg)) { 376 if ((msg.rm_xid == xid) && 377 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 378 (msg.acpted_rply.ar_stat == SUCCESS)) { 379 raddr.sin_port = htons((u_short)port); 380 done = (*eachresult)(resultsp, &raddr); 381 } 382 /* otherwise, we just ignore the errors ... */ 383 } else { 384 #ifdef notdef 385 /* some kind of deserialization problem ... */ 386 if (msg.rm_xid == xid) 387 fprintf(stderr, "Broadcast deserialization problem"); 388 /* otherwise, just random garbage */ 389 #endif 390 } 391 xdrs->x_op = XDR_FREE; 392 msg.acpted_rply.ar_results.proc = xdr_void; 393 (void)xdr_replymsg(xdrs, &msg); 394 (void)(*xresults)(xdrs, resultsp); 395 xdr_destroy(xdrs); 396 if (done) { 397 stat = RPC_SUCCESS; 398 goto done_broad; 399 } else { 400 goto recv_again; 401 } 402 } 403 done_broad: 404 (void)close(sock); 405 AUTH_DESTROY(unix_auth); 406 return (stat); 407 } 408