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 1994/12/04 01:13:20 cgd 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 <errno.h> 51 #include <net/if.h> 52 #include <sys/ioctl.h> 53 #include <arpa/inet.h> 54 #define MAX_BROADCAST_SIZE 1400 55 56 static struct timeval timeout = { 3, 0 }; 57 58 59 /* 60 * pmapper remote-call-service interface. 61 * This routine is used to call the pmapper remote call service 62 * which will look up a service program in the port maps, and then 63 * remotely call that routine with the given parameters. This allows 64 * programs to do a lookup and call in one step. 65 */ 66 enum clnt_stat 67 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 68 struct sockaddr_in *addr; 69 u_long prog, vers, proc; 70 xdrproc_t xdrargs, xdrres; 71 caddr_t argsp, resp; 72 struct timeval tout; 73 u_long *port_ptr; 74 { 75 int socket = -1; 76 register CLIENT *client; 77 struct rmtcallargs a; 78 struct rmtcallres r; 79 enum clnt_stat stat; 80 81 addr->sin_port = htons(PMAPPORT); 82 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); 83 if (client != (CLIENT *)NULL) { 84 a.prog = prog; 85 a.vers = vers; 86 a.proc = proc; 87 a.args_ptr = argsp; 88 a.xdr_args = xdrargs; 89 r.port_ptr = port_ptr; 90 r.results_ptr = resp; 91 r.xdr_results = xdrres; 92 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 93 xdr_rmtcallres, &r, tout); 94 CLNT_DESTROY(client); 95 } else { 96 stat = RPC_FAILED; 97 } 98 (void)close(socket); 99 addr->sin_port = 0; 100 return (stat); 101 } 102 103 104 /* 105 * XDR remote call arguments 106 * written for XDR_ENCODE direction only 107 */ 108 bool_t 109 xdr_rmtcall_args(xdrs, cap) 110 register XDR *xdrs; 111 register struct rmtcallargs *cap; 112 { 113 u_int lenposition, argposition, position; 114 115 if (xdr_u_long(xdrs, &(cap->prog)) && 116 xdr_u_long(xdrs, &(cap->vers)) && 117 xdr_u_long(xdrs, &(cap->proc))) { 118 lenposition = XDR_GETPOS(xdrs); 119 if (! xdr_u_long(xdrs, &(cap->arglen))) 120 return (FALSE); 121 argposition = XDR_GETPOS(xdrs); 122 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 123 return (FALSE); 124 position = XDR_GETPOS(xdrs); 125 cap->arglen = (u_long)position - (u_long)argposition; 126 XDR_SETPOS(xdrs, lenposition); 127 if (! xdr_u_long(xdrs, &(cap->arglen))) 128 return (FALSE); 129 XDR_SETPOS(xdrs, position); 130 return (TRUE); 131 } 132 return (FALSE); 133 } 134 135 /* 136 * XDR remote call results 137 * written for XDR_DECODE direction only 138 */ 139 bool_t 140 xdr_rmtcallres(xdrs, crp) 141 register XDR *xdrs; 142 register struct rmtcallres *crp; 143 { 144 caddr_t port_ptr; 145 146 port_ptr = (caddr_t)crp->port_ptr; 147 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 148 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 149 crp->port_ptr = (u_long *)port_ptr; 150 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 151 } 152 return (FALSE); 153 } 154 155 156 /* 157 * The following is kludged-up support for simple rpc broadcasts. 158 * Someday a large, complicated system will replace these trivial 159 * routines which only support udp/ip . 160 */ 161 162 static int 163 getbroadcastnets(addrs, sock, buf) 164 struct in_addr *addrs; 165 int sock; /* any valid socket will do */ 166 char *buf; /* why allocxate more when we can use existing... */ 167 { 168 struct ifconf ifc; 169 struct ifreq ifreq, *ifr; 170 struct sockaddr_in *sin; 171 char *cp, *cplim; 172 int n, i = 0; 173 174 ifc.ifc_len = UDPMSGSIZE; 175 ifc.ifc_buf = buf; 176 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 177 perror("broadcast: ioctl (get interface configuration)"); 178 return (0); 179 } 180 #define max(a, b) (a > b ? a : b) 181 #define size(p) max((p).sa_len, sizeof(p)) 182 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 183 for (cp = buf; cp < cplim; 184 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 185 ifr = (struct ifreq *)cp; 186 if (ifr->ifr_addr.sa_family != AF_INET) 187 continue; 188 ifreq = *ifr; 189 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 190 perror("broadcast: ioctl (get interface flags)"); 191 continue; 192 } 193 if ((ifreq.ifr_flags & IFF_BROADCAST) && 194 (ifreq.ifr_flags & IFF_UP)) { 195 sin = (struct sockaddr_in *)&ifr->ifr_addr; 196 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 197 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 198 addrs[i++] = 199 inet_makeaddr(inet_netof(sin->sin_addr), 200 INADDR_ANY); 201 } else { 202 addrs[i++] = ((struct sockaddr_in*) 203 &ifreq.ifr_addr)->sin_addr; 204 } 205 #else /* 4.2 BSD */ 206 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), 207 INADDR_ANY); 208 #endif 209 } 210 } 211 return (i); 212 } 213 214 typedef bool_t (*resultproc_t)(); 215 216 enum clnt_stat 217 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 218 u_long prog; /* program number */ 219 u_long vers; /* version number */ 220 u_long proc; /* procedure number */ 221 xdrproc_t xargs; /* xdr routine for args */ 222 caddr_t argsp; /* pointer to args */ 223 xdrproc_t xresults; /* xdr routine for results */ 224 caddr_t resultsp; /* pointer to results */ 225 resultproc_t eachresult; /* call with each result obtained */ 226 { 227 enum clnt_stat stat; 228 AUTH *unix_auth = authunix_create_default(); 229 XDR xdr_stream; 230 register XDR *xdrs = &xdr_stream; 231 int outlen, inlen, fromlen, nets; 232 register int sock; 233 int on = 1; 234 fd_set mask; 235 fd_set readfds; 236 register int i; 237 bool_t done = FALSE; 238 register u_long xid; 239 u_long port; 240 struct in_addr addrs[20]; 241 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 242 struct rmtcallargs a; 243 struct rmtcallres r; 244 struct rpc_msg msg; 245 struct timeval t; 246 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 247 248 /* 249 * initialization: create a socket, a broadcast address, and 250 * preserialize the arguments into a send buffer. 251 */ 252 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 253 perror("Cannot create socket for broadcast rpc"); 254 stat = RPC_CANTSEND; 255 goto done_broad; 256 } 257 #ifdef SO_BROADCAST 258 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 259 perror("Cannot set socket option SO_BROADCAST"); 260 stat = RPC_CANTSEND; 261 goto done_broad; 262 } 263 #endif /* def SO_BROADCAST */ 264 FD_ZERO(&mask); 265 FD_SET(sock, &mask); 266 nets = getbroadcastnets(addrs, sock, inbuf); 267 bzero((char *)&baddr, sizeof (baddr)); 268 baddr.sin_family = AF_INET; 269 baddr.sin_port = htons(PMAPPORT); 270 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 271 /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */ 272 (void)gettimeofday(&t, (struct timezone *)0); 273 msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec; 274 t.tv_usec = 0; 275 msg.rm_direction = CALL; 276 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 277 msg.rm_call.cb_prog = PMAPPROG; 278 msg.rm_call.cb_vers = PMAPVERS; 279 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 280 msg.rm_call.cb_cred = unix_auth->ah_cred; 281 msg.rm_call.cb_verf = unix_auth->ah_verf; 282 a.prog = prog; 283 a.vers = vers; 284 a.proc = proc; 285 a.xdr_args = xargs; 286 a.args_ptr = argsp; 287 r.port_ptr = &port; 288 r.xdr_results = xresults; 289 r.results_ptr = resultsp; 290 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 291 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 292 stat = RPC_CANTENCODEARGS; 293 goto done_broad; 294 } 295 outlen = (int)xdr_getpos(xdrs); 296 xdr_destroy(xdrs); 297 /* 298 * Basic loop: broadcast a packet and wait a while for response(s). 299 * The response timeout grows larger per iteration. 300 */ 301 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 302 for (i = 0; i < nets; i++) { 303 baddr.sin_addr = addrs[i]; 304 if (sendto(sock, outbuf, outlen, 0, 305 (struct sockaddr *)&baddr, 306 sizeof (struct sockaddr)) != outlen) { 307 perror("Cannot send broadcast packet"); 308 stat = RPC_CANTSEND; 309 goto done_broad; 310 } 311 } 312 if (eachresult == NULL) { 313 stat = RPC_SUCCESS; 314 goto done_broad; 315 } 316 recv_again: 317 msg.acpted_rply.ar_verf = _null_auth; 318 msg.acpted_rply.ar_results.where = (caddr_t)&r; 319 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 320 readfds = mask; 321 switch (select(sock+1, &readfds, (int *)NULL, 322 (int *)NULL, &t)) { 323 324 case 0: /* timed out */ 325 stat = RPC_TIMEDOUT; 326 continue; 327 328 case -1: /* some kind of error */ 329 if (errno == EINTR) 330 goto recv_again; 331 perror("Broadcast select problem"); 332 stat = RPC_CANTRECV; 333 goto done_broad; 334 335 } /* end of select results switch */ 336 try_again: 337 fromlen = sizeof(struct sockaddr); 338 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 339 (struct sockaddr *)&raddr, &fromlen); 340 if (inlen < 0) { 341 if (errno == EINTR) 342 goto try_again; 343 perror("Cannot receive reply to broadcast"); 344 stat = RPC_CANTRECV; 345 goto done_broad; 346 } 347 if (inlen < sizeof(u_int32_t)) 348 goto recv_again; 349 /* 350 * see if reply transaction id matches sent id. 351 * If so, decode the results. 352 */ 353 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 354 if (xdr_replymsg(xdrs, &msg)) { 355 if ((msg.rm_xid == xid) && 356 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 357 (msg.acpted_rply.ar_stat == SUCCESS)) { 358 raddr.sin_port = htons((u_short)port); 359 done = (*eachresult)(resultsp, &raddr); 360 } 361 /* otherwise, we just ignore the errors ... */ 362 } else { 363 #ifdef notdef 364 /* some kind of deserialization problem ... */ 365 if (msg.rm_xid == xid) 366 fprintf(stderr, "Broadcast deserialization problem"); 367 /* otherwise, just random garbage */ 368 #endif 369 } 370 xdrs->x_op = XDR_FREE; 371 msg.acpted_rply.ar_results.proc = xdr_void; 372 (void)xdr_replymsg(xdrs, &msg); 373 (void)(*xresults)(xdrs, resultsp); 374 xdr_destroy(xdrs); 375 if (done) { 376 stat = RPC_SUCCESS; 377 goto done_broad; 378 } else { 379 goto recv_again; 380 } 381 } 382 done_broad: 383 (void)close(sock); 384 AUTH_DESTROY(unix_auth); 385 return (stat); 386 } 387 388