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 1.5 2003/06/05 21:43:28 majka 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 extern int errno;
  83 static struct timeval timeout = { 3, 0 };
  84
  85
  86 /*
  87  * pmapper remote-call-service interface.
  88  * This routine is used to call the pmapper remote call service
  89  * which will look up a service program in the port maps, and then
  90  * remotely call that routine with the given parameters.  This allows
  91  * programs to do a lookup and call in one step.
  92 */
  93 enum clnt_stat
  94 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  95         struct sockaddr_in *addr;
  96         u_long prog, vers, proc;
  97         xdrproc_t xdrargs, xdrres;
  98         caddr_t argsp, resp;
  99         struct timeval tout;
 100         u_long *port_ptr;
 101 {
 102         int socket = -1;
 103         register CLIENT *client;
 104         struct rmtcallargs a;
 105         struct rmtcallres r;
 106         enum clnt_stat stat;
 107
 108         addr->sin_port = htons(PMAPPORT);
 109         client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
 110         if (client != (CLIENT *)NULL) {
 111                 a.prog = prog;
 112                 a.vers = vers;
 113                 a.proc = proc;
 114                 a.args_ptr = argsp;
 115                 a.xdr_args = xdrargs;
 116                 r.port_ptr = port_ptr;
 117                 r.results_ptr = resp;
 118                 r.xdr_results = xdrres;
 119                 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a,
 120                     xdr_rmtcallres, &r, tout);
 121                 CLNT_DESTROY(client);
 122         } else {
 123                 stat = RPC_FAILED;
 124         }
 125         (void)close(socket);
 126         addr->sin_port = 0;
 127         return (stat);
 128 }
 129
 130
 131 /*
 132  * XDR remote call arguments
 133  * written for XDR_ENCODE direction only
 134  */
 135 bool_t
 136 xdr_rmtcall_args(xdrs, cap)
 137         register XDR *xdrs;
 138         register struct rmtcallargs *cap;
 139 {
 140         u_int lenposition, argposition, position;
 141
 142         if (xdr_u_long(xdrs, &(cap->prog)) &&
 143             xdr_u_long(xdrs, &(cap->vers)) &&
 144             xdr_u_long(xdrs, &(cap->proc))) {
 145                 lenposition = XDR_GETPOS(xdrs);
 146                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 147                     return (FALSE);
 148                 argposition = XDR_GETPOS(xdrs);
 149                 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
 150                     return (FALSE);
 151                 position = XDR_GETPOS(xdrs);
 152                 cap->arglen = (u_long)position - (u_long)argposition;
 153                 XDR_SETPOS(xdrs, lenposition);
 154                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 155                     return (FALSE);
 156                 XDR_SETPOS(xdrs, position);
 157                 return (TRUE);
 158         }
 159         return (FALSE);
 160 }
 161
 162 /*
 163  * XDR remote call results
 164  * written for XDR_DECODE direction only
 165  */
 166 bool_t
 167 xdr_rmtcallres(xdrs, crp)
 168         register XDR *xdrs;
 169         register struct rmtcallres *crp;
 170 {
 171         caddr_t port_ptr;
 172
 173         port_ptr = (caddr_t)crp->port_ptr;
 174         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),
 175             xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 176                 crp->port_ptr = (u_long *)port_ptr;
 177                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 178         }
 179         return (FALSE);
 180 }
 181
 182
 183 /*
 184  * The following is kludged-up support for simple rpc broadcasts.
 185  * Someday a large, complicated system will replace these trivial
 186  * routines which only support udp/ip .
 187  */
 188
 189 static int
 190 getbroadcastnets(addrs, sock, buf)
 191         struct in_addr *addrs;
 192         int sock;  /* any valid socket will do */
 193         char *buf;  /* why allocxate more when we can use existing... */
 194 {
 195         struct ifconf ifc;
 196         struct ifreq ifreq, *ifr;
 197         struct sockaddr_in *sin;
 198         char *cp, *cplim;
 199         int i = 0;
 200
 201         ifc.ifc_len = UDPMSGSIZE;
 202         ifc.ifc_buf = buf;
 203         if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 204                 perror("broadcast: ioctl (get interface configuration)");
 205                 return (0);
 206         }
 207 #define max(a, b) (a > b ? a : b)
 208 #define size(p) max((p).sa_len, sizeof(p))
 209         cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
 210         for (cp = buf; cp < cplim;
 211                         cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
 212                 ifr = (struct ifreq *)cp;
 213                 if (ifr->ifr_addr.sa_family != AF_INET)
 214                         continue;
 215                 ifreq = *ifr;
 216                 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 217                         perror("broadcast: ioctl (get interface flags)");
 218                         continue;
 219                 }
 220                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 221                     (ifreq.ifr_flags & IFF_UP)) {
 222                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 223 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 224                         if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 225                                 addrs[i++] =
 226                                     inet_makeaddr(inet_netof(sin->sin_addr),
 227                                     INADDR_ANY);
 228                         } else {
 229                                 addrs[i++] = ((struct sockaddr_in*)
 230                                   &ifreq.ifr_addr)->sin_addr;
 231                         }
 232 #else /* 4.2 BSD */
 233                         addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr),
 234                             INADDR_ANY);
 235 #endif
 236                 }
 237         }
 238         return (i);
 239 }
 240
 241 typedef bool_t (*resultproc_t)();
 242
 243 enum clnt_stat
 244 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 245         u_long          prog;           /* program number */
 246         u_long          vers;           /* version number */
 247         u_long          proc;           /* procedure number */
 248         xdrproc_t       xargs;          /* xdr routine for args */
 249         caddr_t         argsp;          /* pointer to args */
 250         xdrproc_t       xresults;       /* xdr routine for results */
 251         caddr_t         resultsp;       /* pointer to results */
 252         resultproc_t    eachresult;     /* call with each result obtained */
 253 {
 254         enum clnt_stat stat;
 255         AUTH *unix_auth = authunix_create_default();
 256         XDR xdr_stream;
 257         register XDR *xdrs = &xdr_stream;
 258         int outlen, inlen, fromlen, nets;
 259         register int sock;
 260         int on = 1;
 261         fd_set mask;
 262         fd_set readfds;
 263         register int i;
 264         bool_t done = FALSE;
 265         u_long xid;
 266         u_long port;
 267         struct in_addr addrs[20];
 268         struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
 269         struct rmtcallargs a;
 270         struct rmtcallres r;
 271         struct rpc_msg msg;
 272         struct timeval t;
 273         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 274         int rfd;
 275
 276         /*
 277          * initialization: create a socket, a broadcast address, and
 278          * preserialize the arguments into a send buffer.
 279          */
 280         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 281                 perror("Cannot create socket for broadcast rpc");
 282                 stat = RPC_CANTSEND;
 283                 goto done_broad;
 284         }
 285 #ifdef SO_BROADCAST
 286         if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 287                 perror("Cannot set socket option SO_BROADCAST");
 288                 stat = RPC_CANTSEND;
 289                 goto done_broad;
 290         }
 291 #endif /* def SO_BROADCAST */
 292         FD_ZERO(&mask);
 293         FD_SET(sock, &mask);
 294         nets = getbroadcastnets(addrs, sock, inbuf);
 295         bzero((char *)&baddr, sizeof (baddr));
 296         baddr.sin_family = AF_INET;
 297         baddr.sin_port = htons(PMAPPORT);
 298         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 299 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 300
 301         rfd = open("/dev/random", O_RDONLY, 0);
 302         if ((rfd < 0) || (read(rfd, &xid, sizeof(xid)) != sizeof(xid)))
 303         {
 304                 gettimeofday(&t, (struct timezone *)0);
 305                 xid = getpid() ^ t.tv_sec ^ t.tv_usec;
 306         }
 307         if (rfd > 0) close(rfd);
 308
 309         t.tv_usec = 0;
 310         msg.rm_xid = xid;
 311         msg.rm_direction = CALL;
 312         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 313         msg.rm_call.cb_prog = PMAPPROG;
 314         msg.rm_call.cb_vers = PMAPVERS;
 315         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 316         msg.rm_call.cb_cred = unix_auth->ah_cred;
 317         msg.rm_call.cb_verf = unix_auth->ah_verf;
 318         a.prog = prog;
 319         a.vers = vers;
 320         a.proc = proc;
 321         a.xdr_args = xargs;
 322         a.args_ptr = argsp;
 323         r.port_ptr = &port;
 324         r.xdr_results = xresults;
 325         r.results_ptr = resultsp;
 326         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 327         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 328                 stat = RPC_CANTENCODEARGS;
 329                 goto done_broad;
 330         }
 331         outlen = (int)xdr_getpos(xdrs);
 332         xdr_destroy(xdrs);
 333         /*
 334          * Basic loop: broadcast a packet and wait a while for response(s).
 335          * The response timeout grows larger per iteration.
 336          */
 337         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 338                 for (i = 0; i < nets; i++) {
 339                         baddr.sin_addr = addrs[i];
 340                         if (sendto(sock, outbuf, outlen, 0,
 341                                 (struct sockaddr *)&baddr,
 342                                 sizeof (struct sockaddr)) != outlen) {
 343                                 perror("Cannot send broadcast packet");
 344                                 stat = RPC_CANTSEND;
 345                                 goto done_broad;
 346                         }
 347                 }
 348                 if (eachresult == NULL) {
 349                         stat = RPC_SUCCESS;
 350                         goto done_broad;
 351                 }
 352         recv_again:
 353                 msg.acpted_rply.ar_verf = _null_auth;
 354                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 355                 msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
 356                 readfds = mask;
 357                 switch (select(sock+1, &readfds, NULL, NULL, &t)) {
 358
 359                 case 0:  /* timed out */
 360                         stat = RPC_TIMEDOUT;
 361                         continue;
 362
 363                 case -1:  /* some kind of error */
 364                         if (errno == EINTR)
 365                                 goto recv_again;
 366                         perror("Broadcast select problem");
 367                         stat = RPC_CANTRECV;
 368                         goto done_broad;
 369
 370                 }  /* end of select results switch */
 371         try_again:
 372                 fromlen = sizeof(struct sockaddr);
 373                 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0,
 374                         (struct sockaddr *)&raddr, &fromlen);
 375                 if (inlen < 0) {
 376                         if (errno == EINTR)
 377                                 goto try_again;
 378                         perror("Cannot receive reply to broadcast");
 379                         stat = RPC_CANTRECV;
 380                         goto done_broad;
 381                 }
 382                 if (inlen < sizeof(u_long))
 383                         goto recv_again;
 384                 /*
 385                  * see if reply transaction id matches sent id.
 386                  * If so, decode the results.
 387                  */
 388                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 389                 if (xdr_replymsg(xdrs, &msg)) {
 390                         if ((msg.rm_xid == xid) &&
 391                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 392                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 393                                 raddr.sin_port = htons((u_short)port);
 394                                 done = (*eachresult)(resultsp, &raddr);
 395                         }
 396                         /* otherwise, we just ignore the errors ... */
 397                 } else {
 398 #ifdef notdef
 399                         /* some kind of deserialization problem ... */
 400                         if (msg.rm_xid == xid)
 401                                 fprintf(stderr, "Broadcast deserialization problem");
 402                         /* otherwise, just random garbage */
 403 #endif
 404                 }
 405                 xdrs->x_op = XDR_FREE;
 406                 msg.acpted_rply.ar_results.proc = xdr_void;
 407                 (void)xdr_replymsg(xdrs, &msg);
 408                 (void)(*xresults)(xdrs, resultsp);
 409                 xdr_destroy(xdrs);
 410                 if (done) {
 411                         stat = RPC_SUCCESS;
 412                         goto done_broad;
 413                 } else {
 414                         goto recv_again;
 415                 }
 416         }
 417 done_broad:
 418         (void)close(sock);
 419         AUTH_DESTROY(unix_auth);
 420         return (stat);
 421 }
 422