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 = "$Id: pmap_rmt.c,v 1.3 1995/10/22 14:51:32 phk 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 <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 extern int errno; 59 static struct timeval timeout = { 3, 0 }; 60 61 62 /* 63 * pmapper remote-call-service interface. 64 * This routine is used to call the pmapper remote call service 65 * which will look up a service program in the port maps, and then 66 * remotely call that routine with the given parameters. This allows 67 * programs to do a lookup and call in one step. 68 */ 69 enum clnt_stat 70 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 71 struct sockaddr_in *addr; 72 u_long prog, vers, proc; 73 xdrproc_t xdrargs, xdrres; 74 caddr_t argsp, resp; 75 struct timeval tout; 76 u_long *port_ptr; 77 { 78 int socket = -1; 79 register CLIENT *client; 80 struct rmtcallargs a; 81 struct rmtcallres r; 82 enum clnt_stat stat; 83 84 addr->sin_port = htons(PMAPPORT); 85 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); 86 if (client != (CLIENT *)NULL) { 87 a.prog = prog; 88 a.vers = vers; 89 a.proc = proc; 90 a.args_ptr = argsp; 91 a.xdr_args = xdrargs; 92 r.port_ptr = port_ptr; 93 r.results_ptr = resp; 94 r.xdr_results = xdrres; 95 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 96 xdr_rmtcallres, &r, tout); 97 CLNT_DESTROY(client); 98 } else { 99 stat = RPC_FAILED; 100 } 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 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 ifreq = *ifr; 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 addrs[i++] = 202 inet_makeaddr(inet_netof(sin->sin_addr), 203 INADDR_ANY); 204 } else { 205 addrs[i++] = ((struct sockaddr_in*) 206 &ifreq.ifr_addr)->sin_addr; 207 } 208 #else /* 4.2 BSD */ 209 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), 210 INADDR_ANY); 211 #endif 212 } 213 } 214 return (i); 215 } 216 217 typedef bool_t (*resultproc_t)(); 218 219 enum clnt_stat 220 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 221 u_long prog; /* program number */ 222 u_long vers; /* version number */ 223 u_long proc; /* procedure number */ 224 xdrproc_t xargs; /* xdr routine for args */ 225 caddr_t argsp; /* pointer to args */ 226 xdrproc_t xresults; /* xdr routine for results */ 227 caddr_t resultsp; /* pointer to results */ 228 resultproc_t eachresult; /* call with each result obtained */ 229 { 230 enum clnt_stat stat; 231 AUTH *unix_auth = authunix_create_default(); 232 XDR xdr_stream; 233 register XDR *xdrs = &xdr_stream; 234 int outlen, inlen, fromlen, nets; 235 register int sock; 236 int on = 1; 237 #ifdef FD_SETSIZE 238 fd_set mask; 239 fd_set readfds; 240 #else 241 int readfds; 242 register int mask; 243 #endif /* def FD_SETSIZE */ 244 register int i; 245 bool_t done = FALSE; 246 register u_long xid; 247 u_long port; 248 struct in_addr addrs[20]; 249 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 250 struct rmtcallargs a; 251 struct rmtcallres r; 252 struct rpc_msg msg; 253 struct timeval t; 254 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 255 256 /* 257 * initialization: create a socket, a broadcast address, and 258 * preserialize the arguments into a send buffer. 259 */ 260 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 261 perror("Cannot create socket for broadcast rpc"); 262 stat = RPC_CANTSEND; 263 goto done_broad; 264 } 265 #ifdef SO_BROADCAST 266 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 267 perror("Cannot set socket option SO_BROADCAST"); 268 stat = RPC_CANTSEND; 269 goto done_broad; 270 } 271 #endif /* def SO_BROADCAST */ 272 #ifdef FD_SETSIZE 273 FD_ZERO(&mask); 274 FD_SET(sock, &mask); 275 #else 276 mask = (1 << sock); 277 #endif /* def FD_SETSIZE */ 278 nets = getbroadcastnets(addrs, sock, inbuf); 279 bzero((char *)&baddr, sizeof (baddr)); 280 baddr.sin_family = AF_INET; 281 baddr.sin_port = htons(PMAPPORT); 282 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 283 /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */ 284 (void)gettimeofday(&t, (struct timezone *)0); 285 msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec; 286 t.tv_usec = 0; 287 msg.rm_direction = CALL; 288 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 289 msg.rm_call.cb_prog = PMAPPROG; 290 msg.rm_call.cb_vers = PMAPVERS; 291 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 292 msg.rm_call.cb_cred = unix_auth->ah_cred; 293 msg.rm_call.cb_verf = unix_auth->ah_verf; 294 a.prog = prog; 295 a.vers = vers; 296 a.proc = proc; 297 a.xdr_args = xargs; 298 a.args_ptr = argsp; 299 r.port_ptr = &port; 300 r.xdr_results = xresults; 301 r.results_ptr = resultsp; 302 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 303 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 304 stat = RPC_CANTENCODEARGS; 305 goto done_broad; 306 } 307 outlen = (int)xdr_getpos(xdrs); 308 xdr_destroy(xdrs); 309 /* 310 * Basic loop: broadcast a packet and wait a while for response(s). 311 * The response timeout grows larger per iteration. 312 */ 313 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 314 for (i = 0; i < nets; i++) { 315 baddr.sin_addr = addrs[i]; 316 if (sendto(sock, outbuf, outlen, 0, 317 (struct sockaddr *)&baddr, 318 sizeof (struct sockaddr)) != outlen) { 319 perror("Cannot send broadcast packet"); 320 stat = RPC_CANTSEND; 321 goto done_broad; 322 } 323 } 324 if (eachresult == NULL) { 325 stat = RPC_SUCCESS; 326 goto done_broad; 327 } 328 recv_again: 329 msg.acpted_rply.ar_verf = _null_auth; 330 msg.acpted_rply.ar_results.where = (caddr_t)&r; 331 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 332 readfds = mask; 333 switch (select(_rpc_dtablesize(), &readfds, (fd_set *)NULL, 334 (fd_set *)NULL, &t)) { 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 select problem"); 344 stat = RPC_CANTRECV; 345 goto done_broad; 346 347 } /* end of select 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_long)) 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 } 399 400