1 /* $NetBSD: pmap_rmt.c,v 1.8 1997/02/08 04:38:03 mycroft 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 #if defined(LIBC_SCCS) && !defined(lint) 33 /*static char *sccsid = "from: @(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";*/ 34 /*static char *sccsid = "from: @(#)pmap_rmt.c 2.2 88/08/01 4.0 RPCSRC";*/ 35 static char *rcsid = "$NetBSD: pmap_rmt.c,v 1.8 1997/02/08 04:38:03 mycroft Exp $"; 36 #endif 37 38 /* 39 * pmap_rmt.c 40 * Client interface to pmap rpc service. 41 * remote call and broadcast service 42 * 43 * Copyright (C) 1984, Sun Microsystems, Inc. 44 */ 45 46 #include <sys/types.h> 47 #include <sys/poll.h> 48 49 #include <rpc/rpc.h> 50 #include <rpc/pmap_prot.h> 51 #include <rpc/pmap_clnt.h> 52 #include <rpc/pmap_rmt.h> 53 #include <sys/socket.h> 54 #include <stdio.h> 55 #include <errno.h> 56 #include <string.h> 57 #include <net/if.h> 58 #include <sys/ioctl.h> 59 #include <arpa/inet.h> 60 #define MAX_BROADCAST_SIZE 1400 61 62 static struct timeval timeout = { 3, 0 }; 63 64 65 /* 66 * pmapper remote-call-service interface. 67 * This routine is used to call the pmapper remote call service 68 * which will look up a service program in the port maps, and then 69 * remotely call that routine with the given parameters. This allows 70 * programs to do a lookup and call in one step. 71 */ 72 enum clnt_stat 73 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) 74 struct sockaddr_in *addr; 75 u_long prog, vers, proc; 76 xdrproc_t xdrargs, xdrres; 77 caddr_t argsp, resp; 78 struct timeval tout; 79 u_long *port_ptr; 80 { 81 int socket = -1; 82 register CLIENT *client; 83 struct rmtcallargs a; 84 struct rmtcallres r; 85 enum clnt_stat stat; 86 87 addr->sin_port = htons(PMAPPORT); 88 client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket); 89 if (client != (CLIENT *)NULL) { 90 a.prog = prog; 91 a.vers = vers; 92 a.proc = proc; 93 a.args_ptr = argsp; 94 a.xdr_args = xdrargs; 95 r.port_ptr = port_ptr; 96 r.results_ptr = resp; 97 r.xdr_results = xdrres; 98 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a, 99 xdr_rmtcallres, &r, tout); 100 CLNT_DESTROY(client); 101 } else { 102 stat = RPC_FAILED; 103 } 104 (void)close(socket); 105 addr->sin_port = 0; 106 return (stat); 107 } 108 109 110 /* 111 * XDR remote call arguments 112 * written for XDR_ENCODE direction only 113 */ 114 bool_t 115 xdr_rmtcall_args(xdrs, cap) 116 register XDR *xdrs; 117 register struct rmtcallargs *cap; 118 { 119 u_int lenposition, argposition, position; 120 121 if (xdr_u_long(xdrs, &(cap->prog)) && 122 xdr_u_long(xdrs, &(cap->vers)) && 123 xdr_u_long(xdrs, &(cap->proc))) { 124 lenposition = XDR_GETPOS(xdrs); 125 if (! xdr_u_long(xdrs, &(cap->arglen))) 126 return (FALSE); 127 argposition = XDR_GETPOS(xdrs); 128 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr)) 129 return (FALSE); 130 position = XDR_GETPOS(xdrs); 131 cap->arglen = (u_long)position - (u_long)argposition; 132 XDR_SETPOS(xdrs, lenposition); 133 if (! xdr_u_long(xdrs, &(cap->arglen))) 134 return (FALSE); 135 XDR_SETPOS(xdrs, position); 136 return (TRUE); 137 } 138 return (FALSE); 139 } 140 141 /* 142 * XDR remote call results 143 * written for XDR_DECODE direction only 144 */ 145 bool_t 146 xdr_rmtcallres(xdrs, crp) 147 register XDR *xdrs; 148 register struct rmtcallres *crp; 149 { 150 caddr_t port_ptr; 151 152 port_ptr = (caddr_t)crp->port_ptr; 153 if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 154 xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) { 155 crp->port_ptr = (u_long *)port_ptr; 156 return ((*(crp->xdr_results))(xdrs, crp->results_ptr)); 157 } 158 return (FALSE); 159 } 160 161 162 /* 163 * The following is kludged-up support for simple rpc broadcasts. 164 * Someday a large, complicated system will replace these trivial 165 * routines which only support udp/ip . 166 */ 167 168 static int 169 getbroadcastnets(addrs, sock, buf) 170 struct in_addr *addrs; 171 int sock; /* any valid socket will do */ 172 char *buf; /* why allocxate more when we can use existing... */ 173 { 174 struct ifconf ifc; 175 struct ifreq ifreq, *ifr; 176 struct sockaddr_in *sin; 177 char *cp, *cplim; 178 int n, i = 0; 179 180 ifc.ifc_len = UDPMSGSIZE; 181 ifc.ifc_buf = buf; 182 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 183 perror("broadcast: ioctl (get interface configuration)"); 184 return (0); 185 } 186 #define max(a, b) (a > b ? a : b) 187 #define size(p) max((p).sa_len, sizeof(p)) 188 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 189 for (cp = buf; cp < cplim; 190 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 191 ifr = (struct ifreq *)cp; 192 if (ifr->ifr_addr.sa_family != AF_INET) 193 continue; 194 ifreq = *ifr; 195 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 196 perror("broadcast: ioctl (get interface flags)"); 197 continue; 198 } 199 if ((ifreq.ifr_flags & IFF_BROADCAST) && 200 (ifreq.ifr_flags & IFF_UP)) { 201 sin = (struct sockaddr_in *)&ifr->ifr_addr; 202 #ifdef SIOCGIFBRDADDR /* 4.3BSD */ 203 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 204 addrs[i++] = 205 inet_makeaddr(inet_netof(sin->sin_addr), 206 INADDR_ANY); 207 } else { 208 addrs[i++] = ((struct sockaddr_in*) 209 &ifreq.ifr_addr)->sin_addr; 210 } 211 #else /* 4.2 BSD */ 212 addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), 213 INADDR_ANY); 214 #endif 215 } 216 } 217 return (i); 218 } 219 220 typedef bool_t (*resultproc_t)(); 221 222 enum clnt_stat 223 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 224 u_long prog; /* program number */ 225 u_long vers; /* version number */ 226 u_long proc; /* procedure number */ 227 xdrproc_t xargs; /* xdr routine for args */ 228 caddr_t argsp; /* pointer to args */ 229 xdrproc_t xresults; /* xdr routine for results */ 230 caddr_t resultsp; /* pointer to results */ 231 resultproc_t eachresult; /* call with each result obtained */ 232 { 233 enum clnt_stat stat; 234 AUTH *unix_auth = authunix_create_default(); 235 XDR xdr_stream; 236 register XDR *xdrs = &xdr_stream; 237 int outlen, inlen, fromlen, nets; 238 register int sock; 239 int on = 1; 240 struct pollfd fd; 241 register int i; 242 bool_t done = FALSE; 243 register u_long xid; 244 u_long port; 245 struct in_addr addrs[20]; 246 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 247 struct rmtcallargs a; 248 struct rmtcallres r; 249 struct rpc_msg msg; 250 struct timeval t; 251 int milliseconds; 252 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 253 254 /* 255 * initialization: create a socket, a broadcast address, and 256 * preserialize the arguments into a send buffer. 257 */ 258 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 259 perror("Cannot create socket for broadcast rpc"); 260 stat = RPC_CANTSEND; 261 goto done_broad; 262 } 263 #ifdef SO_BROADCAST 264 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 265 perror("Cannot set socket option SO_BROADCAST"); 266 stat = RPC_CANTSEND; 267 goto done_broad; 268 } 269 #endif /* def SO_BROADCAST */ 270 fd.fd = sock; 271 fd.events = POLLIN; 272 nets = getbroadcastnets(addrs, sock, inbuf); 273 memset(&baddr, 0, sizeof (baddr)); 274 baddr.sin_len = sizeof(struct sockaddr_in); 275 baddr.sin_family = AF_INET; 276 baddr.sin_port = htons(PMAPPORT); 277 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 278 /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */ 279 (void)gettimeofday(&t, (struct timezone *)0); 280 msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec; 281 t.tv_usec = 0; 282 msg.rm_direction = CALL; 283 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 284 msg.rm_call.cb_prog = PMAPPROG; 285 msg.rm_call.cb_vers = PMAPVERS; 286 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 287 msg.rm_call.cb_cred = unix_auth->ah_cred; 288 msg.rm_call.cb_verf = unix_auth->ah_verf; 289 a.prog = prog; 290 a.vers = vers; 291 a.proc = proc; 292 a.xdr_args = xargs; 293 a.args_ptr = argsp; 294 r.port_ptr = &port; 295 r.xdr_results = xresults; 296 r.results_ptr = resultsp; 297 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 298 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 299 stat = RPC_CANTENCODEARGS; 300 goto done_broad; 301 } 302 outlen = (int)xdr_getpos(xdrs); 303 xdr_destroy(xdrs); 304 /* 305 * Basic loop: broadcast a packet and wait a while for response(s). 306 * The response timeout grows larger per iteration. 307 */ 308 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 309 for (i = 0; i < nets; i++) { 310 baddr.sin_addr = addrs[i]; 311 if (sendto(sock, outbuf, outlen, 0, 312 (struct sockaddr *)&baddr, 313 sizeof (struct sockaddr)) != outlen) { 314 perror("Cannot send broadcast packet"); 315 stat = RPC_CANTSEND; 316 goto done_broad; 317 } 318 } 319 if (eachresult == NULL) { 320 stat = RPC_SUCCESS; 321 goto done_broad; 322 } 323 recv_again: 324 milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000; 325 msg.acpted_rply.ar_verf = _null_auth; 326 msg.acpted_rply.ar_results.where = (caddr_t)&r; 327 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 328 switch (poll(&fd, 1, milliseconds)) { 329 330 case 0: /* timed out */ 331 stat = RPC_TIMEDOUT; 332 continue; 333 334 case -1: /* some kind of error */ 335 if (errno == EINTR) 336 goto recv_again; 337 perror("Broadcast poll problem"); 338 stat = RPC_CANTRECV; 339 goto done_broad; 340 341 } /* end of poll results switch */ 342 try_again: 343 fromlen = sizeof(struct sockaddr); 344 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 345 (struct sockaddr *)&raddr, &fromlen); 346 if (inlen < 0) { 347 if (errno == EINTR) 348 goto try_again; 349 perror("Cannot receive reply to broadcast"); 350 stat = RPC_CANTRECV; 351 goto done_broad; 352 } 353 if (inlen < sizeof(u_int32_t)) 354 goto recv_again; 355 /* 356 * see if reply transaction id matches sent id. 357 * If so, decode the results. 358 */ 359 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 360 if (xdr_replymsg(xdrs, &msg)) { 361 if ((msg.rm_xid == xid) && 362 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 363 (msg.acpted_rply.ar_stat == SUCCESS)) { 364 raddr.sin_port = htons((u_short)port); 365 done = (*eachresult)(resultsp, &raddr); 366 } 367 /* otherwise, we just ignore the errors ... */ 368 } else { 369 #ifdef notdef 370 /* some kind of deserialization problem ... */ 371 if (msg.rm_xid == xid) 372 fprintf(stderr, "Broadcast deserialization problem"); 373 /* otherwise, just random garbage */ 374 #endif 375 } 376 xdrs->x_op = XDR_FREE; 377 msg.acpted_rply.ar_results.proc = xdr_void; 378 (void)xdr_replymsg(xdrs, &msg); 379 (void)(*xresults)(xdrs, resultsp); 380 xdr_destroy(xdrs); 381 if (done) { 382 stat = RPC_SUCCESS; 383 goto done_broad; 384 } else { 385 goto recv_again; 386 } 387 } 388 done_broad: 389 (void)close(sock); 390 AUTH_DESTROY(unix_auth); 391 return (stat); 392 } 393 394