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 #include "pmap_wakeup.h"
  83
  84 static struct timeval timeout = { 3, 0 };
  85
  86
  87 /*
  88  * pmapper remote-call-service interface.
  89  * This routine is used to call the pmapper remote call service
  90  * which will look up a service program in the port maps, and then
  91  * remotely call that routine with the given parameters.  This allows
  92  * programs to do a lookup and call in one step.
  93 */
  94 enum clnt_stat
  95 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  96         struct sockaddr_in *addr;
  97         u_long prog, vers, proc;
  98         xdrproc_t xdrargs, xdrres;
  99         caddr_t argsp, resp;
 100         struct timeval tout;
 101         u_long *port_ptr;
 102 {
 103         int socket = -1;
 104         register CLIENT *client;
 105         struct rmtcallargs a;
 106         struct rmtcallres r;
 107         enum clnt_stat stat;
 108
 109         pmap_wakeup();
 110
 111         addr->sin_port = htons(PMAPPORT);
 112         client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
 113         if (client != (CLIENT *)NULL) {
 114                 a.prog = prog;
 115                 a.vers = vers;
 116                 a.proc = proc;
 117                 a.args_ptr = argsp;
 118                 a.xdr_args = xdrargs;
 119                 r.port_ptr = port_ptr;
 120                 r.results_ptr = resp;
 121                 r.xdr_results = xdrres;
 122                 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a,
 123                     xdr_rmtcallres, &r, tout);
 124                 CLNT_DESTROY(client);
 125         } else {
 126                 stat = RPC_FAILED;
 127         }
 128         (void)close(socket);
 129         addr->sin_port = 0;
 130         return (stat);
 131 }
 132
 133
 134 /*
 135  * XDR remote call arguments
 136  * written for XDR_ENCODE direction only
 137  */
 138 bool_t
 139 xdr_rmtcall_args(xdrs, cap)
 140         register XDR *xdrs;
 141         register struct rmtcallargs *cap;
 142 {
 143         u_int lenposition, argposition, position;
 144
 145         if (xdr_u_long(xdrs, &(cap->prog)) &&
 146             xdr_u_long(xdrs, &(cap->vers)) &&
 147             xdr_u_long(xdrs, &(cap->proc))) {
 148                 lenposition = XDR_GETPOS(xdrs);
 149                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 150                     return (FALSE);
 151                 argposition = XDR_GETPOS(xdrs);
 152                 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
 153                     return (FALSE);
 154                 position = XDR_GETPOS(xdrs);
 155                 cap->arglen = (u_long)position - (u_long)argposition;
 156                 XDR_SETPOS(xdrs, lenposition);
 157                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 158                     return (FALSE);
 159                 XDR_SETPOS(xdrs, position);
 160                 return (TRUE);
 161         }
 162         return (FALSE);
 163 }
 164
 165 /*
 166  * XDR remote call results
 167  * written for XDR_DECODE direction only
 168  */
 169 bool_t
 170 xdr_rmtcallres(xdrs, crp)
 171         register XDR *xdrs;
 172         register struct rmtcallres *crp;
 173 {
 174         caddr_t port_ptr;
 175
 176         port_ptr = (caddr_t)crp->port_ptr;
 177         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),
 178             xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 179                 crp->port_ptr = (u_long *)port_ptr;
 180                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 181         }
 182         return (FALSE);
 183 }
 184
 185
 186 /*
 187  * The following is kludged-up support for simple rpc broadcasts.
 188  * Someday a large, complicated system will replace these trivial
 189  * routines which only support udp/ip .
 190  */
 191
 192 static int
 193 getbroadcastnets(addrs, sock, buf)
 194         struct in_addr *addrs;
 195         int sock;  /* any valid socket will do */
 196         char *buf;  /* why allocxate more when we can use existing... */
 197 {
 198         struct ifconf ifc;
 199         struct ifreq ifreq, *ifr;
 200         struct sockaddr_in *sin;
 201         char *cp, *cplim;
 202         int i = 0;
 203
 204         ifc.ifc_len = UDPMSGSIZE;
 205         ifc.ifc_buf = buf;
 206         if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 207                 perror("broadcast: ioctl (get interface configuration)");
 208                 return (0);
 209         }
 210 #define max(a, b) (a > b ? a : b)
 211 #define size(p) max((p).sa_len, sizeof(p))
 212         cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
 213         for (cp = buf; cp < cplim;
 214                         cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
 215                 ifr = (struct ifreq *)cp;
 216                 if (ifr->ifr_addr.sa_family != AF_INET)
 217                         continue;
 218                 ifreq = *ifr;
 219                 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 220                         perror("broadcast: ioctl (get interface flags)");
 221                         continue;
 222                 }
 223                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 224                     (ifreq.ifr_flags & IFF_UP)) {
 225                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 226 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 227                         if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 228                                 addrs[i++] =
 229                                     inet_makeaddr(inet_netof(sin->sin_addr),
 230                                     INADDR_ANY);
 231                         } else {
 232                                 addrs[i++] = ((struct sockaddr_in*)
 233                                   &ifreq.ifr_addr)->sin_addr;
 234                         }
 235 #else /* 4.2 BSD */
 236                         addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr),
 237                             INADDR_ANY);
 238 #endif
 239                 }
 240         }
 241         return (i);
 242 }
 243
 244 typedef bool_t (*resultproc_t)();
 245
 246 enum clnt_stat
 247 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 248         u_long          prog;           /* program number */
 249         u_long          vers;           /* version number */
 250         u_long          proc;           /* procedure number */
 251         xdrproc_t       xargs;          /* xdr routine for args */
 252         caddr_t         argsp;          /* pointer to args */
 253         xdrproc_t       xresults;       /* xdr routine for results */
 254         caddr_t         resultsp;       /* pointer to results */
 255         resultproc_t    eachresult;     /* call with each result obtained */
 256 {
 257         enum clnt_stat stat;
 258         AUTH *unix_auth = authunix_create_default();
 259         XDR xdr_stream;
 260         register XDR *xdrs = &xdr_stream;
 261         int outlen, inlen, fromlen, nets;
 262         register int sock;
 263         int on = 1;
 264         fd_set mask;
 265         fd_set readfds;
 266         register int i;
 267         bool_t done = FALSE;
 268         u_long xid;
 269         u_long port;
 270         struct in_addr addrs[20];
 271         struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
 272         struct rmtcallargs a;
 273         struct rmtcallres r;
 274         struct rpc_msg msg;
 275         struct timeval t;
 276         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 277         int rfd;
 278
 279         /*
 280          * initialization: create a socket, a broadcast address, and
 281          * preserialize the arguments into a send buffer.
 282          */
 283         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 284                 perror("Cannot create socket for broadcast rpc");
 285                 stat = RPC_CANTSEND;
 286                 goto done_broad;
 287         }
 288 #ifdef SO_BROADCAST
 289         if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 290                 perror("Cannot set socket option SO_BROADCAST");
 291                 stat = RPC_CANTSEND;
 292                 goto done_broad;
 293         }
 294 #endif /* def SO_BROADCAST */
 295         FD_ZERO(&mask);
 296         FD_SET(sock, &mask);
 297         nets = getbroadcastnets(addrs, sock, inbuf);
 298         bzero((char *)&baddr, sizeof (baddr));
 299         baddr.sin_family = AF_INET;
 300         baddr.sin_port = htons(PMAPPORT);
 301         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 302 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 303
 304         rfd = open("/dev/random", O_RDONLY, 0);
 305         if ((rfd < 0) || (read(rfd, &xid, sizeof(xid)) != sizeof(xid)))
 306         {
 307                 gettimeofday(&t, (struct timezone *)0);
 308                 xid = getpid() ^ t.tv_sec ^ t.tv_usec;
 309         }
 310         if (rfd > 0) close(rfd);
 311
 312         t.tv_usec = 0;
 313         msg.rm_xid = xid;
 314         msg.rm_direction = CALL;
 315         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 316         msg.rm_call.cb_prog = PMAPPROG;
 317         msg.rm_call.cb_vers = PMAPVERS;
 318         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 319         msg.rm_call.cb_cred = unix_auth->ah_cred;
 320         msg.rm_call.cb_verf = unix_auth->ah_verf;
 321         a.prog = prog;
 322         a.vers = vers;
 323         a.proc = proc;
 324         a.xdr_args = xargs;
 325         a.args_ptr = argsp;
 326         r.port_ptr = &port;
 327         r.xdr_results = xresults;
 328         r.results_ptr = resultsp;
 329         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 330         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 331                 stat = RPC_CANTENCODEARGS;
 332                 goto done_broad;
 333         }
 334         outlen = (int)xdr_getpos(xdrs);
 335         xdr_destroy(xdrs);
 336         /*
 337          * Basic loop: broadcast a packet and wait a while for response(s).
 338          * The response timeout grows larger per iteration.
 339          */
 340         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 341                 for (i = 0; i < nets; i++) {
 342                         baddr.sin_addr = addrs[i];
 343                         if (sendto(sock, outbuf, outlen, 0,
 344                                 (struct sockaddr *)&baddr,
 345                                 sizeof (struct sockaddr)) != outlen) {
 346                                 perror("Cannot send broadcast packet");
 347                                 stat = RPC_CANTSEND;
 348                                 goto done_broad;
 349                         }
 350                 }
 351                 if (eachresult == NULL) {
 352                         stat = RPC_SUCCESS;
 353                         goto done_broad;
 354                 }
 355         recv_again:
 356                 msg.acpted_rply.ar_verf = _null_auth;
 357                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 358                 msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
 359                 readfds = mask;
 360                 switch (select(sock+1, &readfds, NULL, NULL, &t)) {
 361
 362                 case 0:  /* timed out */
 363                         stat = RPC_TIMEDOUT;
 364                         continue;
 365
 366                 case -1:  /* some kind of error */
 367                         if (errno == EINTR)
 368                                 goto recv_again;
 369                         perror("Broadcast select problem");
 370                         stat = RPC_CANTRECV;
 371                         goto done_broad;
 372
 373                 }  /* end of select results switch */
 374         try_again:
 375                 fromlen = sizeof(struct sockaddr);
 376                 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0,
 377                         (struct sockaddr *)&raddr, &fromlen);
 378                 if (inlen < 0) {
 379                         if (errno == EINTR)
 380                                 goto try_again;
 381                         perror("Cannot receive reply to broadcast");
 382                         stat = RPC_CANTRECV;
 383                         goto done_broad;
 384                 }
 385                 if (inlen < sizeof(u_long))
 386                         goto recv_again;
 387                 /*
 388                  * see if reply transaction id matches sent id.
 389                  * If so, decode the results.
 390                  */
 391                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 392                 if (xdr_replymsg(xdrs, &msg)) {
 393                         if ((msg.rm_xid == xid) &&
 394                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 395                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 396                                 raddr.sin_port = htons((u_short)port);
 397                                 done = (*eachresult)(resultsp, &raddr);
 398                         }
 399                         /* otherwise, we just ignore the errors ... */
 400                 } else {
 401 #ifdef notdef
 402                         /* some kind of deserialization problem ... */
 403                         if (msg.rm_xid == xid)
 404                                 fprintf(stderr, "Broadcast deserialization problem");
 405                         /* otherwise, just random garbage */
 406 #endif
 407                 }
 408                 xdrs->x_op = XDR_FREE;
 409                 msg.acpted_rply.ar_results.proc = xdr_void;
 410                 (void)xdr_replymsg(xdrs, &msg);
 411                 (void)(*xresults)(xdrs, resultsp);
 412                 xdr_destroy(xdrs);
 413                 if (done) {
 414                         stat = RPC_SUCCESS;
 415                         goto done_broad;
 416                 } else {
 417                         goto recv_again;
 418                 }
 419         }
 420 done_broad:
 421         (void)close(sock);
 422         AUTH_DESTROY(unix_auth);
 423         return (stat);
 424 }
 425