rpc.subproj/pmap_rmt.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";*/
  55 /*static char *sccsid = "from: @(#)pmap_rmt.c   2.2 88/08/01 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: pmap_rmt.c,v 1.6 2004/12/19 22:45:44 zarzycki Exp $";
  57 #endif
  58
  59 /*
  60  * pmap_rmt.c
  61  * Client interface to pmap rpc service.
  62  * remote call and broadcast service
  63  *
  64  * Copyright (C) 1984, Sun Microsystems, Inc.
  65  */
  66
  67 #include <string.h>
  68 #include <unistd.h>
  69 #include <rpc/rpc.h>
  70 #include <rpc/pmap_prot.h>
  71 #include <rpc/pmap_clnt.h>
  72 #include <rpc/pmap_rmt.h>
  73 #include <sys/socket.h>
  74 #include <sys/fcntl.h>
  75 #include <stdio.h>
  76 #include <errno.h>
  77 #include <net/if.h>
  78 #include <sys/ioctl.h>
  79 #include <arpa/inet.h>
  80 #define MAX_BROADCAST_SIZE 1400
  81
  82 static struct timeval timeout = { 3, 0 };
  83
  84
  85 /*
  86  * pmapper remote-call-service interface.
  87  * This routine is used to call the pmapper remote call service
  88  * which will look up a service program in the port maps, and then
  89  * remotely call that routine with the given parameters.  This allows
  90  * programs to do a lookup and call in one step.
  91 */
  92 enum clnt_stat
  93 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  94 #ifdef __LP64__
  95         struct sockaddr_in *addr;
  96         uint32_t prog, vers, proc;
  97         xdrproc_t xdrargs, xdrres;
  98         caddr_t argsp, resp;
  99         struct timeval tout;
 100         uint32_t *port_ptr;
 101 #else
 102         struct sockaddr_in *addr;
 103         u_long prog, vers, proc;
 104         xdrproc_t xdrargs, xdrres;
 105         caddr_t argsp, resp;
 106         struct timeval tout;
 107         u_long *port_ptr;
 108 #endif
 109 {
 110         int socket = -1;
 111         register CLIENT *client;
 112         struct rmtcallargs a;
 113         struct rmtcallres r;
 114         enum clnt_stat stat;
 115
 116         addr->sin_port = htons(PMAPPORT);
 117         client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
 118         if (client != (CLIENT *)NULL) {
 119                 a.prog = prog;
 120                 a.vers = vers;
 121                 a.proc = proc;
 122                 a.args_ptr = argsp;
 123                 a.xdr_args = xdrargs;
 124                 r.port_ptr = port_ptr;
 125                 r.results_ptr = resp;
 126                 r.xdr_results = xdrres;
 127                 stat = CLNT_CALL(client, PMAPPROC_CALLIT, (xdrproc_t)xdr_rmtcall_args, &a, (xdrproc_t)xdr_rmtcallres, &r, tout);
 128                 CLNT_DESTROY(client);
 129         } else {
 130                 stat = RPC_FAILED;
 131         }
 132         (void)close(socket);
 133         addr->sin_port = 0;
 134         return (stat);
 135 }
 136
 137
 138 /*
 139  * XDR remote call arguments
 140  * written for XDR_ENCODE direction only
 141  */
 142 bool_t
 143 xdr_rmtcall_args(xdrs, cap)
 144         register XDR *xdrs;
 145         register struct rmtcallargs *cap;
 146 {
 147         u_int lenposition, argposition, position;
 148
 149         if (xdr_u_long(xdrs, &(cap->prog)) &&
 150             xdr_u_long(xdrs, &(cap->vers)) &&
 151             xdr_u_long(xdrs, &(cap->proc))) {
 152                 lenposition = XDR_GETPOS(xdrs);
 153                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 154                     return (FALSE);
 155                 argposition = XDR_GETPOS(xdrs);
 156                 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
 157                     return (FALSE);
 158                 position = XDR_GETPOS(xdrs);
 159 #ifdef __LP64__
 160                 cap->arglen = (uint32_t)position - (uint32_t)argposition;
 161 #else
 162                 cap->arglen = (u_long)position - (u_long)argposition;
 163 #endif
 164                 XDR_SETPOS(xdrs, lenposition);
 165                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 166                     return (FALSE);
 167                 XDR_SETPOS(xdrs, position);
 168                 return (TRUE);
 169         }
 170         return (FALSE);
 171 }
 172
 173 /*
 174  * XDR remote call results
 175  * written for XDR_DECODE direction only
 176  */
 177 bool_t
 178 xdr_rmtcallres(xdrs, crp)
 179         register XDR *xdrs;
 180         register struct rmtcallres *crp;
 181 {
 182         caddr_t port_ptr;
 183
 184         port_ptr = (caddr_t)crp->port_ptr;
 185 #ifdef __LP64__
 186         if (xdr_reference(xdrs, &port_ptr, sizeof (uint32_t), (xdrproc_t)xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 187                 crp->port_ptr = (unsigned int *)port_ptr;
 188                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 189         }
 190 #else
 191         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), (xdrproc_t)xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 192                 crp->port_ptr = (unsigned long *)port_ptr;
 193                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 194         }
 195 #endif
 196         return (FALSE);
 197 }
 198
 199
 200 /*
 201  * The following is kludged-up support for simple rpc broadcasts.
 202  * Someday a large, complicated system will replace these trivial
 203  * routines which only support udp/ip .
 204  */
 205
 206 static int
 207 getbroadcastnets(addrs, sock, buf)
 208         struct in_addr *addrs;
 209         int sock;  /* any valid socket will do */
 210         char *buf;  /* why allocxate more when we can use existing... */
 211 {
 212         struct ifconf ifc;
 213         struct ifreq ifreq, *ifr;
 214         struct sockaddr_in *sin;
 215         char *cp, *cplim;
 216         int i = 0;
 217
 218         ifc.ifc_len = UDPMSGSIZE;
 219         ifc.ifc_buf = buf;
 220         if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 221                 perror("broadcast: ioctl (get interface configuration)");
 222                 return (0);
 223         }
 224 #define max(a, b) (a > b ? a : b)
 225 #define size(p) max((p).sa_len, sizeof(p))
 226         cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
 227         for (cp = buf; cp < cplim;
 228                         cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
 229                 ifr = (struct ifreq *)cp;
 230                 if (ifr->ifr_addr.sa_family != AF_INET)
 231                         continue;
 232                 ifreq = *ifr;
 233                 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 234                         perror("broadcast: ioctl (get interface flags)");
 235                         continue;
 236                 }
 237                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 238                     (ifreq.ifr_flags & IFF_UP)) {
 239                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 240 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 241                         if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 242                                 addrs[i++] =
 243                                     inet_makeaddr(inet_netof(sin->sin_addr),
 244                                     INADDR_ANY);
 245                         } else {
 246                                 addrs[i++] = ((struct sockaddr_in*)
 247                                   &ifreq.ifr_addr)->sin_addr;
 248                         }
 249 #else /* 4.2 BSD */
 250                         addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr),
 251                             INADDR_ANY);
 252 #endif
 253                 }
 254         }
 255         return (i);
 256 }
 257
 258 typedef bool_t (*resultproc_t)();
 259
 260 enum clnt_stat
 261 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 262 #ifdef __LP64__
 263         uint32_t prog;          /* program number */
 264         uint32_t vers;          /* version number */
 265         uint32_t proc;          /* procedure number */
 266         xdrproc_t xargs;                /* xdr routine for args */
 267         caddr_t argsp;          /* pointer to args */
 268         xdrproc_t xresults;     /* xdr routine for results */
 269         caddr_t resultsp;       /* pointer to results */
 270         resultproc_t eachresult;        /* call with each result obtained */
 271 #else
 272         u_long          prog;           /* program number */
 273         u_long          vers;           /* version number */
 274         u_long          proc;           /* procedure number */
 275         xdrproc_t       xargs;          /* xdr routine for args */
 276         caddr_t         argsp;          /* pointer to args */
 277         xdrproc_t       xresults;       /* xdr routine for results */
 278         caddr_t         resultsp;       /* pointer to results */
 279         resultproc_t    eachresult;     /* call with each result obtained */
 280 #endif
 281 {
 282         enum clnt_stat stat;
 283         AUTH *unix_auth = authunix_create_default();
 284         XDR xdr_stream;
 285         register XDR *xdrs = &xdr_stream;
 286         int outlen, inlen, nets;
 287         unsigned int fromlen;
 288         register int sock;
 289         int on = 1;
 290         fd_set mask;
 291         fd_set readfds;
 292         register int i;
 293         bool_t done = FALSE;
 294         uint32_t xid;
 295 #ifdef __LP64__
 296         unsigned int port;
 297 #else
 298         unsigned long port;
 299 #endif
 300         struct in_addr addrs[20];
 301         struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
 302         struct rmtcallargs a;
 303         struct rmtcallres r;
 304         struct rpc_msg msg;
 305         struct timeval t;
 306         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 307         int rfd;
 308
 309         stat = RPC_SUCCESS;
 310
 311         /*
 312          * initialization: create a socket, a broadcast address, and
 313          * preserialize the arguments into a send buffer.
 314          */
 315         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 316                 perror("Cannot create socket for broadcast rpc");
 317                 stat = RPC_CANTSEND;
 318                 goto done_broad;
 319         }
 320 #ifdef SO_BROADCAST
 321         if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 322                 perror("Cannot set socket option SO_BROADCAST");
 323                 stat = RPC_CANTSEND;
 324                 goto done_broad;
 325         }
 326 #endif /* def SO_BROADCAST */
 327         FD_ZERO(&mask);
 328         FD_SET(sock, &mask);
 329         nets = getbroadcastnets(addrs, sock, inbuf);
 330         bzero((char *)&baddr, sizeof (baddr));
 331         baddr.sin_family = AF_INET;
 332         baddr.sin_port = htons(PMAPPORT);
 333         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 334 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 335
 336         rfd = open("/dev/random", O_RDONLY, 0);
 337         if ((rfd < 0) || (read(rfd, &xid, sizeof(xid)) != sizeof(xid)))
 338         {
 339                 gettimeofday(&t, (struct timezone *)0);
 340                 xid = getpid() ^ t.tv_sec ^ t.tv_usec;
 341         }
 342         if (rfd > 0) close(rfd);
 343
 344         t.tv_usec = 0;
 345         msg.rm_xid = xid;
 346         msg.rm_direction = CALL;
 347         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 348         msg.rm_call.cb_prog = PMAPPROG;
 349         msg.rm_call.cb_vers = PMAPVERS;
 350         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 351         msg.rm_call.cb_cred = unix_auth->ah_cred;
 352         msg.rm_call.cb_verf = unix_auth->ah_verf;
 353         a.prog = prog;
 354         a.vers = vers;
 355         a.proc = proc;
 356         a.xdr_args = xargs;
 357         a.args_ptr = argsp;
 358         r.port_ptr = &port;
 359         r.xdr_results = xresults;
 360         r.results_ptr = resultsp;
 361         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 362         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 363                 stat = RPC_CANTENCODEARGS;
 364                 goto done_broad;
 365         }
 366         outlen = (int)xdr_getpos(xdrs);
 367         xdr_destroy(xdrs);
 368         /*
 369          * Basic loop: broadcast a packet and wait a while for response(s).
 370          * The response timeout grows larger per iteration.
 371          */
 372         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 373                 for (i = 0; i < nets; i++) {
 374                         baddr.sin_addr = addrs[i];
 375                         if (sendto(sock, outbuf, outlen, 0,
 376                                 (struct sockaddr *)&baddr,
 377                                 sizeof (struct sockaddr)) != outlen) {
 378                                 perror("Cannot send broadcast packet");
 379                                 stat = RPC_CANTSEND;
 380                                 goto done_broad;
 381                         }
 382                 }
 383                 if (eachresult == NULL) {
 384                         stat = RPC_SUCCESS;
 385                         goto done_broad;
 386                 }
 387         recv_again:
 388                 msg.acpted_rply.ar_verf = _null_auth;
 389                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 390                 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_rmtcallres;
 391                 readfds = mask;
 392                 switch (select(sock+1, &readfds, NULL, NULL, &t)) {
 393
 394                 case 0:  /* timed out */
 395                         stat = RPC_TIMEDOUT;
 396                         continue;
 397
 398                 case -1:  /* some kind of error */
 399                         if (errno == EINTR)
 400                                 goto recv_again;
 401                         perror("Broadcast select problem");
 402                         stat = RPC_CANTRECV;
 403                         goto done_broad;
 404
 405                 }  /* end of select results switch */
 406         try_again:
 407                 fromlen = sizeof(struct sockaddr);
 408                 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, (struct sockaddr *)&raddr, &fromlen);
 409                 if (inlen < 0) {
 410                         if (errno == EINTR)
 411                                 goto try_again;
 412                         perror("Cannot receive reply to broadcast");
 413                         stat = RPC_CANTRECV;
 414                         goto done_broad;
 415                 }
 416 #ifdef __LP64__
 417                 if (inlen < sizeof(uint32_t))
 418                         goto recv_again;
 419 #else
 420                 if (inlen < sizeof(u_long))
 421                         goto recv_again;
 422 #endif
 423                 /*
 424                  * see if reply transaction id matches sent id.
 425                  * If so, decode the results.
 426                  */
 427                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 428                 if (xdr_replymsg(xdrs, &msg)) {
 429                         if ((msg.rm_xid == xid) &&
 430                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 431                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 432                                 raddr.sin_port = htons((u_short)port);
 433                                 done = (*eachresult)(resultsp, &raddr);
 434                         }
 435                         /* otherwise, we just ignore the errors ... */
 436                 } else {
 437 #ifdef notdef
 438                         /* some kind of deserialization problem ... */
 439                         if (msg.rm_xid == xid)
 440                                 fprintf(stderr, "Broadcast deserialization problem");
 441                         /* otherwise, just random garbage */
 442 #endif
 443                 }
 444                 xdrs->x_op = XDR_FREE;
 445                 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
 446                 (void)xdr_replymsg(xdrs, &msg);
 447                 (void)(*xresults)(xdrs, resultsp);
 448                 xdr_destroy(xdrs);
 449                 if (done) {
 450                         stat = RPC_SUCCESS;
 451                         goto done_broad;
 452                 } else {
 453                         goto recv_again;
 454                 }
 455         }
 456 done_broad:
 457         (void)close(sock);
 458         AUTH_DESTROY(unix_auth);
 459         return (stat);
 460 }
 461