1 /* $NetBSD: pmap_rmt.c,v 1.9 1997/07/13 20:13:16 christos 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 1.9 1997/07/13 20:13:16 christos 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 <sys/types.h> 51 #include <sys/poll.h> 52 53 #include <rpc/rpc.h> 54 #include <rpc/pmap_prot.h> 55 #include <rpc/pmap_clnt.h> 56 #include <rpc/pmap_rmt.h> 57 #include <sys/socket.h> 58 #include <stdio.h> 59 #include <errno.h> 60 #include <string.h> 61 #include <unistd.h> 62 #include <net/if.h> 63 #include <sys/ioctl.h> 64 #include <arpa/inet.h> 65 #define MAX_BROADCAST_SIZE 1400 66 67 static int getbroadcastnets __P((struct in_addr *, int, char *)); 68 69 static struct timeval timeout = { 3, 0 }; 70 71 /* 72 * pmapper remote-call-service interface. 73 * This routine is used to call the pmapper remote call service 74 * which will look up a service program in the port maps, and then 75 * remotely call that routine with the given parameters. This allows 76 * programs to do a lookup and call in one step. 77 */ 78 enum clnt_stat 79 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 80 struct sockaddr_in *addr; 81 u_long prog, vers, proc; 82 xdrproc_t xdrargs, xdrres; 83 caddr_t argsp, resp; 84 struct timeval tout; 85 u_long *port_ptr; 86 { 87 int socket = -1; 88 register CLIENT *client; 89 struct rmtcallargs a; 90 struct rmtcallres r; 91 enum clnt_stat stat; 92 93 addr->sin_port = htons(PMAPPORT); 94 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); 95 if (client != (CLIENT *)NULL) { 96 a.prog = prog; 97 a.vers = vers; 98 a.proc = proc; 99 a.args_ptr = argsp; 100 a.xdr_args = xdrargs; 101 r.port_ptr = port_ptr; 102 r.results_ptr = resp; 103 r.xdr_results = xdrres; 104 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 105 xdr_rmtcallres, &r, tout); 106 CLNT_DESTROY(client); 107 } else { 108 stat = RPC_FAILED; 109 } 110 (void)close(socket); 111 addr->sin_port = 0; 112 return (stat); 113 } 114 115 116 /* 117 * XDR remote call arguments 118 * written for XDR_ENCODE direction only 119 */ 120 bool_t 121 xdr_rmtcall_args(xdrs, cap) 122 register XDR *xdrs; 123 register struct rmtcallargs *cap; 124 { 125 u_int lenposition, argposition, position; 126 127 if (xdr_u_long(xdrs, &(cap->prog)) && 128 xdr_u_long(xdrs, &(cap->vers)) && 129 xdr_u_long(xdrs, &(cap->proc))) { 130 lenposition = XDR_GETPOS(xdrs); 131 if (! xdr_u_long(xdrs, &(cap->arglen))) 132 return (FALSE); 133 argposition = XDR_GETPOS(xdrs); 134 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 135 return (FALSE); 136 position = XDR_GETPOS(xdrs); 137 cap->arglen = (u_long)position - (u_long)argposition; 138 XDR_SETPOS(xdrs, lenposition); 139 if (! xdr_u_long(xdrs, &(cap->arglen))) 140 return (FALSE); 141 XDR_SETPOS(xdrs, position); 142 return (TRUE); 143 } 144 return (FALSE); 145 } 146 147 /* 148 * XDR remote call results 149 * written for XDR_DECODE direction only 150 */ 151 bool_t 152 xdr_rmtcallres(xdrs, crp) 153 register XDR *xdrs; 154 register struct rmtcallres *crp; 155 { 156 caddr_t port_ptr; 157 158 port_ptr = (caddr_t)crp->port_ptr; 159 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 160 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 161 crp->port_ptr = (u_long *)port_ptr; 162 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 163 } 164 return (FALSE); 165 } 166 167 168 /* 169 * The following is kludged-up support for simple rpc broadcasts. 170 * Someday a large, complicated system will replace these trivial 171 * routines which only support udp/ip . 172 */ 173 174 static int 175 getbroadcastnets(addrs, sock, buf) 176 struct in_addr *addrs; 177 int sock; /* any valid socket will do */ 178 char *buf; /* why allocxate more when we can use existing... */ 179 { 180 struct ifconf ifc; 181 struct ifreq ifreq, *ifr; 182 struct sockaddr_in *sin; 183 char *cp, *cplim; 184 int i = 0; 185 186 ifc.ifc_len = UDPMSGSIZE; 187 ifc.ifc_buf = buf; 188 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 189 perror("broadcast: ioctl (get interface configuration)"); 190 return (0); 191 } 192 #define max(a, b) (a > b ? a : b) 193 #define size(p) max((p).sa_len, sizeof(p)) 194 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 195 for (cp = buf; cp < cplim; 196 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 197 ifr = (struct ifreq *)cp; 198 if (ifr->ifr_addr.sa_family != AF_INET) 199 continue; 200 ifreq = *ifr; 201 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 202 perror("broadcast: ioctl (get interface flags)"); 203 continue; 204 } 205 if ((ifreq.ifr_flags & IFF_BROADCAST) && 206 (ifreq.ifr_flags & IFF_UP)) { 207 sin = (struct sockaddr_in *)&ifr->ifr_addr; 208 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 209 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 210 addrs[i++] = 211 inet_makeaddr(inet_netof(sin->sin_addr), 212 INADDR_ANY); 213 } else { 214 addrs[i++] = ((struct sockaddr_in*) 215 &ifreq.ifr_addr)->sin_addr; 216 } 217 #else /* 4.2 BSD */ 218 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), 219 INADDR_ANY); 220 #endif 221 } 222 } 223 return (i); 224 } 225 226 typedef bool_t (*resultproc_t) __P((caddr_t, struct sockaddr_in *)); 227 228 enum clnt_stat 229 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 230 u_long prog; /* program number */ 231 u_long vers; /* version number */ 232 u_long proc; /* procedure number */ 233 xdrproc_t xargs; /* xdr routine for args */ 234 caddr_t argsp; /* pointer to args */ 235 xdrproc_t xresults; /* xdr routine for results */ 236 caddr_t resultsp; /* pointer to results */ 237 resultproc_t eachresult; /* call with each result obtained */ 238 { 239 enum clnt_stat stat; 240 AUTH *unix_auth = authunix_create_default(); 241 XDR xdr_stream; 242 register XDR *xdrs = &xdr_stream; 243 int outlen, inlen, fromlen, nets; 244 register int sock; 245 int on = 1; 246 struct pollfd fd; 247 register int i; 248 bool_t done = FALSE; 249 register u_long xid; 250 u_long port; 251 struct in_addr addrs[20]; 252 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 253 struct rmtcallargs a; 254 struct rmtcallres r; 255 struct rpc_msg msg; 256 struct timeval t; 257 int milliseconds; 258 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 259 260 /* 261 * initialization: create a socket, a broadcast address, and 262 * preserialize the arguments into a send buffer. 263 */ 264 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 265 perror("Cannot create socket for broadcast rpc"); 266 stat = RPC_CANTSEND; 267 goto done_broad; 268 } 269 #ifdef SO_BROADCAST 270 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 271 perror("Cannot set socket option SO_BROADCAST"); 272 stat = RPC_CANTSEND; 273 goto done_broad; 274 } 275 #endif /* def SO_BROADCAST */ 276 fd.fd = sock; 277 fd.events = POLLIN; 278 nets = getbroadcastnets(addrs, sock, inbuf); 279 memset(&baddr, 0, sizeof (baddr)); 280 baddr.sin_len = sizeof(struct sockaddr_in); 281 baddr.sin_family = AF_INET; 282 baddr.sin_port = htons(PMAPPORT); 283 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 284 /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */ 285 (void)gettimeofday(&t, (struct timezone *)0); 286 msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec; 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 * Basic loop: broadcast a packet and wait a while for response(s). 312 * The response timeout grows larger per iteration. 313 */ 314 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 315 for (i = 0; i < nets; i++) { 316 baddr.sin_addr = addrs[i]; 317 if (sendto(sock, outbuf, outlen, 0, 318 (struct sockaddr *)&baddr, 319 sizeof (struct sockaddr)) != outlen) { 320 perror("Cannot send broadcast packet"); 321 stat = RPC_CANTSEND; 322 goto done_broad; 323 } 324 } 325 if (eachresult == NULL) { 326 stat = RPC_SUCCESS; 327 goto done_broad; 328 } 329 recv_again: 330 milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000; 331 msg.acpted_rply.ar_verf = _null_auth; 332 msg.acpted_rply.ar_results.where = (caddr_t)&r; 333 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 334 switch (poll(&fd, 1, milliseconds)) { 335 336 case 0: /* timed out */ 337 stat = RPC_TIMEDOUT; 338 continue; 339 340 case -1: /* some kind of error */ 341 if (errno == EINTR) 342 goto recv_again; 343 perror("Broadcast poll problem"); 344 stat = RPC_CANTRECV; 345 goto done_broad; 346 347 } /* end of poll results switch */ 348 try_again: 349 fromlen = sizeof(struct sockaddr); 350 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 351 (struct sockaddr *)&raddr, &fromlen); 352 if (inlen < 0) { 353 if (errno == EINTR) 354 goto try_again; 355 perror("Cannot receive reply to broadcast"); 356 stat = RPC_CANTRECV; 357 goto done_broad; 358 } 359 if (inlen < sizeof(u_int32_t)) 360 goto recv_again; 361 /* 362 * see if reply transaction id matches sent id. 363 * If so, decode the results. 364 */ 365 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 366 if (xdr_replymsg(xdrs, &msg)) { 367 if ((msg.rm_xid == xid) && 368 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 369 (msg.acpted_rply.ar_stat == SUCCESS)) { 370 raddr.sin_port = htons((u_short)port); 371 done = (*eachresult)(resultsp, &raddr); 372 } 373 /* otherwise, we just ignore the errors ... */ 374 } else { 375 #ifdef notdef 376 /* some kind of deserialization problem ... */ 377 if (msg.rm_xid == xid) 378 fprintf(stderr, "Broadcast deserialization problem"); 379 /* otherwise, just random garbage */ 380 #endif 381 } 382 xdrs->x_op = XDR_FREE; 383 msg.acpted_rply.ar_results.proc = xdr_void; 384 (void)xdr_replymsg(xdrs, &msg); 385 (void)(*xresults)(xdrs, resultsp); 386 xdr_destroy(xdrs); 387 if (done) { 388 stat = RPC_SUCCESS; 389 goto done_broad; 390 } else { 391 goto recv_again; 392 } 393 } 394 done_broad: 395 (void)close(sock); 396 AUTH_DESTROY(unix_auth); 397 return (stat); 398 } 399