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                 cap->arglen = (u_long)position - (u_long)argposition;
 160                 XDR_SETPOS(xdrs, lenposition);
 161                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 162                     return (FALSE);
 163                 XDR_SETPOS(xdrs, position);
 164                 return (TRUE);
 165         }
 166         return (FALSE);
 167 }
 168
 169 /*
 170  * XDR remote call results
 171  * written for XDR_DECODE direction only
 172  */
 173 bool_t
 174 xdr_rmtcallres(xdrs, crp)
 175         register XDR *xdrs;
 176         register struct rmtcallres *crp;
 177 {
 178         caddr_t port_ptr;
 179
 180         port_ptr = (caddr_t)crp->port_ptr;
 181         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), (xdrproc_t)xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 182 #ifdef __LP64__
 183                 crp->port_ptr = (unsigned int *)port_ptr;
 184 #else
 185                 crp->port_ptr = (unsigned long *)port_ptr;
 186 #endif
 187                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 188         }
 189         return (FALSE);
 190 }
 191
 192
 193 /*
 194  * The following is kludged-up support for simple rpc broadcasts.
 195  * Someday a large, complicated system will replace these trivial
 196  * routines which only support udp/ip .
 197  */
 198
 199 static int
 200 getbroadcastnets(addrs, sock, buf)
 201         struct in_addr *addrs;
 202         int sock;  /* any valid socket will do */
 203         char *buf;  /* why allocxate more when we can use existing... */
 204 {
 205         struct ifconf ifc;
 206         struct ifreq ifreq, *ifr;
 207         struct sockaddr_in *sin;
 208         char *cp, *cplim;
 209         int i = 0;
 210
 211         ifc.ifc_len = UDPMSGSIZE;
 212         ifc.ifc_buf = buf;
 213         if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 214                 perror("broadcast: ioctl (get interface configuration)");
 215                 return (0);
 216         }
 217 #define max(a, b) (a > b ? a : b)
 218 #define size(p) max((p).sa_len, sizeof(p))
 219         cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
 220         for (cp = buf; cp < cplim;
 221                         cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
 222                 ifr = (struct ifreq *)cp;
 223                 if (ifr->ifr_addr.sa_family != AF_INET)
 224                         continue;
 225                 ifreq = *ifr;
 226                 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 227                         perror("broadcast: ioctl (get interface flags)");
 228                         continue;
 229                 }
 230                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 231                     (ifreq.ifr_flags & IFF_UP)) {
 232                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 233 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 234                         if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 235                                 addrs[i++] =
 236                                     inet_makeaddr(inet_netof(sin->sin_addr),
 237                                     INADDR_ANY);
 238                         } else {
 239                                 addrs[i++] = ((struct sockaddr_in*)
 240                                   &ifreq.ifr_addr)->sin_addr;
 241                         }
 242 #else /* 4.2 BSD */
 243                         addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr),
 244                             INADDR_ANY);
 245 #endif
 246                 }
 247         }
 248         return (i);
 249 }
 250
 251 typedef bool_t (*resultproc_t)();
 252
 253 enum clnt_stat
 254 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 255 #ifdef __LP64__
 256         uint32_t prog;          /* program number */
 257         uint32_t vers;          /* version number */
 258         uint32_t proc;          /* procedure number */
 259         xdrproc_t xargs;                /* xdr routine for args */
 260         caddr_t argsp;          /* pointer to args */
 261         xdrproc_t xresults;     /* xdr routine for results */
 262         caddr_t resultsp;       /* pointer to results */
 263         resultproc_t eachresult;        /* call with each result obtained */
 264 #else
 265         u_long          prog;           /* program number */
 266         u_long          vers;           /* version number */
 267         u_long          proc;           /* procedure number */
 268         xdrproc_t       xargs;          /* xdr routine for args */
 269         caddr_t         argsp;          /* pointer to args */
 270         xdrproc_t       xresults;       /* xdr routine for results */
 271         caddr_t         resultsp;       /* pointer to results */
 272         resultproc_t    eachresult;     /* call with each result obtained */
 273 #endif
 274 {
 275         enum clnt_stat stat;
 276         AUTH *unix_auth = authunix_create_default();
 277         XDR xdr_stream;
 278         register XDR *xdrs = &xdr_stream;
 279         int outlen, inlen, nets;
 280         unsigned int fromlen;
 281         register int sock;
 282         int on = 1;
 283         fd_set mask;
 284         fd_set readfds;
 285         register int i;
 286         bool_t done = FALSE;
 287         uint32_t xid;
 288 #ifdef __LP64__
 289         unsigned int port;
 290 #else
 291         unsigned long port;
 292 #endif
 293         struct in_addr addrs[20];
 294         struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
 295         struct rmtcallargs a;
 296         struct rmtcallres r;
 297         struct rpc_msg msg;
 298         struct timeval t;
 299         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 300         int rfd;
 301
 302         stat = RPC_SUCCESS;
 303
 304         /*
 305          * initialization: create a socket, a broadcast address, and
 306          * preserialize the arguments into a send buffer.
 307          */
 308         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 309                 perror("Cannot create socket for broadcast rpc");
 310                 stat = RPC_CANTSEND;
 311                 goto done_broad;
 312         }
 313 #ifdef SO_BROADCAST
 314         if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 315                 perror("Cannot set socket option SO_BROADCAST");
 316                 stat = RPC_CANTSEND;
 317                 goto done_broad;
 318         }
 319 #endif /* def SO_BROADCAST */
 320         FD_ZERO(&mask);
 321         FD_SET(sock, &mask);
 322         nets = getbroadcastnets(addrs, sock, inbuf);
 323         bzero((char *)&baddr, sizeof (baddr));
 324         baddr.sin_family = AF_INET;
 325         baddr.sin_port = htons(PMAPPORT);
 326         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 327 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 328
 329         rfd = open("/dev/random", O_RDONLY, 0);
 330         if ((rfd < 0) || (read(rfd, &xid, sizeof(xid)) != sizeof(xid)))
 331         {
 332                 gettimeofday(&t, (struct timezone *)0);
 333                 xid = getpid() ^ t.tv_sec ^ t.tv_usec;
 334         }
 335         if (rfd > 0) close(rfd);
 336
 337         t.tv_usec = 0;
 338         msg.rm_xid = xid;
 339         msg.rm_direction = CALL;
 340         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 341         msg.rm_call.cb_prog = PMAPPROG;
 342         msg.rm_call.cb_vers = PMAPVERS;
 343         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 344         msg.rm_call.cb_cred = unix_auth->ah_cred;
 345         msg.rm_call.cb_verf = unix_auth->ah_verf;
 346         a.prog = prog;
 347         a.vers = vers;
 348         a.proc = proc;
 349         a.xdr_args = xargs;
 350         a.args_ptr = argsp;
 351         r.port_ptr = &port;
 352         r.xdr_results = xresults;
 353         r.results_ptr = resultsp;
 354         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 355         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 356                 stat = RPC_CANTENCODEARGS;
 357                 goto done_broad;
 358         }
 359         outlen = (int)xdr_getpos(xdrs);
 360         xdr_destroy(xdrs);
 361         /*
 362          * Basic loop: broadcast a packet and wait a while for response(s).
 363          * The response timeout grows larger per iteration.
 364          */
 365         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 366                 for (i = 0; i < nets; i++) {
 367                         baddr.sin_addr = addrs[i];
 368                         if (sendto(sock, outbuf, outlen, 0,
 369                                 (struct sockaddr *)&baddr,
 370                                 sizeof (struct sockaddr)) != outlen) {
 371                                 perror("Cannot send broadcast packet");
 372                                 stat = RPC_CANTSEND;
 373                                 goto done_broad;
 374                         }
 375                 }
 376                 if (eachresult == NULL) {
 377                         stat = RPC_SUCCESS;
 378                         goto done_broad;
 379                 }
 380         recv_again:
 381                 msg.acpted_rply.ar_verf = _null_auth;
 382                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 383                 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_rmtcallres;
 384                 readfds = mask;
 385                 switch (select(sock+1, &readfds, NULL, NULL, &t)) {
 386
 387                 case 0:  /* timed out */
 388                         stat = RPC_TIMEDOUT;
 389                         continue;
 390
 391                 case -1:  /* some kind of error */
 392                         if (errno == EINTR)
 393                                 goto recv_again;
 394                         perror("Broadcast select problem");
 395                         stat = RPC_CANTRECV;
 396                         goto done_broad;
 397
 398                 }  /* end of select results switch */
 399         try_again:
 400                 fromlen = sizeof(struct sockaddr);
 401                 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, (struct sockaddr *)&raddr, &fromlen);
 402                 if (inlen < 0) {
 403                         if (errno == EINTR)
 404                                 goto try_again;
 405                         perror("Cannot receive reply to broadcast");
 406                         stat = RPC_CANTRECV;
 407                         goto done_broad;
 408                 }
 409                 if (inlen < sizeof(u_long))
 410                         goto recv_again;
 411                 /*
 412                  * see if reply transaction id matches sent id.
 413                  * If so, decode the results.
 414                  */
 415                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 416                 if (xdr_replymsg(xdrs, &msg)) {
 417                         if ((msg.rm_xid == xid) &&
 418                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 419                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 420                                 raddr.sin_port = htons((u_short)port);
 421                                 done = (*eachresult)(resultsp, &raddr);
 422                         }
 423                         /* otherwise, we just ignore the errors ... */
 424                 } else {
 425 #ifdef notdef
 426                         /* some kind of deserialization problem ... */
 427                         if (msg.rm_xid == xid)
 428                                 fprintf(stderr, "Broadcast deserialization problem");
 429                         /* otherwise, just random garbage */
 430 #endif
 431                 }
 432                 xdrs->x_op = XDR_FREE;
 433                 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
 434                 (void)xdr_replymsg(xdrs, &msg);
 435                 (void)(*xresults)(xdrs, resultsp);
 436                 xdr_destroy(xdrs);
 437                 if (done) {
 438                         stat = RPC_SUCCESS;
 439                         goto done_broad;
 440                 } else {
 441                         goto recv_again;
 442                 }
 443         }
 444 done_broad:
 445         (void)close(sock);
 446         AUTH_DESTROY(unix_auth);
 447         return (stat);
 448 }
 449