pmap_rmt.c revision 14659
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";*/ 33static char *rcsid = "$Id: pmap_rmt.c,v 1.4 1995/12/07 12:50:55 bde 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 58extern int errno; 59static 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*/ 69enum clnt_stat 70pmap_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 */ 111bool_t 112xdr_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 */ 142bool_t 143xdr_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 165static int 166getbroadcastnets(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 struct in_addr addr; 175 char *cp, *cplim; 176 int n, i = 0; 177 178 ifc.ifc_len = UDPMSGSIZE; 179 ifc.ifc_buf = buf; 180 if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { 181 perror("broadcast: ioctl (get interface configuration)"); 182 return (0); 183 } 184#define max(a, b) (a > b ? a : b) 185#define size(p) max((p).sa_len, sizeof(p)) 186 cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 187 for (cp = buf; cp < cplim; 188 cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 189 ifr = (struct ifreq *)cp; 190 if (ifr->ifr_addr.sa_family != AF_INET) 191 continue; 192 ifreq = *ifr; 193 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { 194 perror("broadcast: ioctl (get interface flags)"); 195 continue; 196 } 197 if ((ifreq.ifr_flags & IFF_BROADCAST) && 198 (ifreq.ifr_flags & IFF_UP)) { 199 sin = (struct sockaddr_in *)&ifr->ifr_addr; 200#ifdef SIOCGIFBRDADDR /* 4.3BSD */ 201 if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 202 addr = 203 inet_makeaddr(inet_netof(sin->sin_addr), 204 INADDR_ANY); 205 } else { 206 addr = ((struct sockaddr_in*) 207 &ifreq.ifr_addr)->sin_addr; 208 } 209#else /* 4.2 BSD */ 210 addr = inet_makeaddr(inet_netof(sin->sin_addr), 211 INADDR_ANY); 212#endif 213 for (n=i-1; n>=0; n--) { 214 if (addr.s_addr == addrs[n].s_addr) 215 break; 216 } 217 if (n<0) { 218 addrs[i++] = addr; 219 } 220 } 221 } 222 return (i); 223} 224 225typedef bool_t (*resultproc_t)(); 226 227enum clnt_stat 228clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) 229 u_long prog; /* program number */ 230 u_long vers; /* version number */ 231 u_long proc; /* procedure number */ 232 xdrproc_t xargs; /* xdr routine for args */ 233 caddr_t argsp; /* pointer to args */ 234 xdrproc_t xresults; /* xdr routine for results */ 235 caddr_t resultsp; /* pointer to results */ 236 resultproc_t eachresult; /* call with each result obtained */ 237{ 238 enum clnt_stat stat; 239 AUTH *unix_auth = authunix_create_default(); 240 XDR xdr_stream; 241 register XDR *xdrs = &xdr_stream; 242 int outlen, inlen, fromlen, nets; 243 register int sock; 244 int on = 1; 245#ifdef FD_SETSIZE 246 fd_set mask; 247 fd_set readfds; 248#else 249 int readfds; 250 register int mask; 251#endif /* def FD_SETSIZE */ 252 register int i; 253 bool_t done = FALSE; 254 register u_long xid; 255 u_long port; 256 struct in_addr addrs[20]; 257 struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ 258 struct rmtcallargs a; 259 struct rmtcallres r; 260 struct rpc_msg msg; 261 struct timeval t; 262 char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; 263 264 /* 265 * initialization: create a socket, a broadcast address, and 266 * preserialize the arguments into a send buffer. 267 */ 268 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 269 perror("Cannot create socket for broadcast rpc"); 270 stat = RPC_CANTSEND; 271 goto done_broad; 272 } 273#ifdef SO_BROADCAST 274 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { 275 perror("Cannot set socket option SO_BROADCAST"); 276 stat = RPC_CANTSEND; 277 goto done_broad; 278 } 279#endif /* def SO_BROADCAST */ 280#ifdef FD_SETSIZE 281 FD_ZERO(&mask); 282 FD_SET(sock, &mask); 283#else 284 mask = (1 << sock); 285#endif /* def FD_SETSIZE */ 286 nets = getbroadcastnets(addrs, sock, inbuf); 287 bzero((char *)&baddr, sizeof (baddr)); 288 baddr.sin_family = AF_INET; 289 baddr.sin_port = htons(PMAPPORT); 290 baddr.sin_addr.s_addr = htonl(INADDR_ANY); 291/* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */ 292 (void)gettimeofday(&t, (struct timezone *)0); 293 msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec; 294 t.tv_usec = 0; 295 msg.rm_direction = CALL; 296 msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 297 msg.rm_call.cb_prog = PMAPPROG; 298 msg.rm_call.cb_vers = PMAPVERS; 299 msg.rm_call.cb_proc = PMAPPROC_CALLIT; 300 msg.rm_call.cb_cred = unix_auth->ah_cred; 301 msg.rm_call.cb_verf = unix_auth->ah_verf; 302 a.prog = prog; 303 a.vers = vers; 304 a.proc = proc; 305 a.xdr_args = xargs; 306 a.args_ptr = argsp; 307 r.port_ptr = &port; 308 r.xdr_results = xresults; 309 r.results_ptr = resultsp; 310 xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); 311 if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) { 312 stat = RPC_CANTENCODEARGS; 313 goto done_broad; 314 } 315 outlen = (int)xdr_getpos(xdrs); 316 xdr_destroy(xdrs); 317 /* 318 * Basic loop: broadcast a packet and wait a while for response(s). 319 * The response timeout grows larger per iteration. 320 */ 321 for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { 322 for (i = 0; i < nets; i++) { 323 baddr.sin_addr = addrs[i]; 324 if (sendto(sock, outbuf, outlen, 0, 325 (struct sockaddr *)&baddr, 326 sizeof (struct sockaddr)) != outlen) { 327 perror("Cannot send broadcast packet"); 328 stat = RPC_CANTSEND; 329 goto done_broad; 330 } 331 } 332 if (eachresult == NULL) { 333 stat = RPC_SUCCESS; 334 goto done_broad; 335 } 336 recv_again: 337 msg.acpted_rply.ar_verf = _null_auth; 338 msg.acpted_rply.ar_results.where = (caddr_t)&r; 339 msg.acpted_rply.ar_results.proc = xdr_rmtcallres; 340 readfds = mask; 341 switch (select(_rpc_dtablesize(), &readfds, (fd_set *)NULL, 342 (fd_set *)NULL, &t)) { 343 344 case 0: /* timed out */ 345 stat = RPC_TIMEDOUT; 346 continue; 347 348 case -1: /* some kind of error */ 349 if (errno == EINTR) 350 goto recv_again; 351 perror("Broadcast select problem"); 352 stat = RPC_CANTRECV; 353 goto done_broad; 354 355 } /* end of select results switch */ 356 try_again: 357 fromlen = sizeof(struct sockaddr); 358 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, 359 (struct sockaddr *)&raddr, &fromlen); 360 if (inlen < 0) { 361 if (errno == EINTR) 362 goto try_again; 363 perror("Cannot receive reply to broadcast"); 364 stat = RPC_CANTRECV; 365 goto done_broad; 366 } 367 if (inlen < sizeof(u_long)) 368 goto recv_again; 369 /* 370 * see if reply transaction id matches sent id. 371 * If so, decode the results. 372 */ 373 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE); 374 if (xdr_replymsg(xdrs, &msg)) { 375 if ((msg.rm_xid == xid) && 376 (msg.rm_reply.rp_stat == MSG_ACCEPTED) && 377 (msg.acpted_rply.ar_stat == SUCCESS)) { 378 raddr.sin_port = htons((u_short)port); 379 done = (*eachresult)(resultsp, &raddr); 380 } 381 /* otherwise, we just ignore the errors ... */ 382 } else { 383#ifdef notdef 384 /* some kind of deserialization problem ... */ 385 if (msg.rm_xid == xid) 386 fprintf(stderr, "Broadcast deserialization problem"); 387 /* otherwise, just random garbage */ 388#endif 389 } 390 xdrs->x_op = XDR_FREE; 391 msg.acpted_rply.ar_results.proc = xdr_void; 392 (void)xdr_replymsg(xdrs, &msg); 393 (void)(*xresults)(xdrs, resultsp); 394 xdr_destroy(xdrs); 395 if (done) { 396 stat = RPC_SUCCESS; 397 goto done_broad; 398 } else { 399 goto recv_again; 400 } 401 } 402done_broad: 403 (void)close(sock); 404 AUTH_DESTROY(unix_auth); 405 return (stat); 406} 407 408