rpc.subproj/pmap_rmt.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  27  * unrestricted use provided that this legend is included on all tape
  28  * media and as a part of the software program in whole or part.  Users
  29  * may copy or modify Sun RPC without charge, but are not authorized
  30  * to license or distribute it to anyone else except as part of a product or
  31  * program developed by the user.
  32  *
  33  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  34  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  35  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  36  *
  37  * Sun RPC is provided with no support and without any obligation on the
  38  * part of Sun Microsystems, Inc. to assist in its use, correction,
  39  * modification or enhancement.
  40  *
  41  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  42  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  43  * OR ANY PART THEREOF.
  44  *
  45  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  46  * or profits or other special, indirect and consequential damages, even if
  47  * Sun has been advised of the possibility of such damages.
  48  *
  49  * Sun Microsystems, Inc.
  50  * 2550 Garcia Avenue
  51  * Mountain View, California  94043
  52  */
  53
  54 #if defined(LIBC_SCCS) && !defined(lint)
  55 /*static char *sccsid = "from: @(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";*/
  56 /*static char *sccsid = "from: @(#)pmap_rmt.c   2.2 88/08/01 4.0 RPCSRC";*/
  57 static char *rcsid = "$Id: pmap_rmt.c,v 1.5 2003/06/05 21:43:28 majka Exp $";
  58 #endif
  59
  60 /*
  61  * pmap_rmt.c
  62  * Client interface to pmap rpc service.
  63  * remote call and broadcast service
  64  *
  65  * Copyright (C) 1984, Sun Microsystems, Inc.
  66  */
  67
  68 #include <string.h>
  69 #include <unistd.h>
  70 #include <rpc/rpc.h>
  71 #include <rpc/pmap_prot.h>
  72 #include <rpc/pmap_clnt.h>
  73 #include <rpc/pmap_rmt.h>
  74 #include <sys/socket.h>
  75 #include <sys/fcntl.h>
  76 #include <stdio.h>
  77 #include <errno.h>
  78 #include <net/if.h>
  79 #include <sys/ioctl.h>
  80 #include <arpa/inet.h>
  81 #define MAX_BROADCAST_SIZE 1400
  82
  83 extern int errno;
  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         addr->sin_port = htons(PMAPPORT);
 110         client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
 111         if (client != (CLIENT *)NULL) {
 112                 a.prog = prog;
 113                 a.vers = vers;
 114                 a.proc = proc;
 115                 a.args_ptr = argsp;
 116                 a.xdr_args = xdrargs;
 117                 r.port_ptr = port_ptr;
 118                 r.results_ptr = resp;
 119                 r.xdr_results = xdrres;
 120                 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a,
 121                     xdr_rmtcallres, &r, tout);
 122                 CLNT_DESTROY(client);
 123         } else {
 124                 stat = RPC_FAILED;
 125         }
 126         (void)close(socket);
 127         addr->sin_port = 0;
 128         return (stat);
 129 }
 130
 131
 132 /*
 133  * XDR remote call arguments
 134  * written for XDR_ENCODE direction only
 135  */
 136 bool_t
 137 xdr_rmtcall_args(xdrs, cap)
 138         register XDR *xdrs;
 139         register struct rmtcallargs *cap;
 140 {
 141         u_int lenposition, argposition, position;
 142
 143         if (xdr_u_long(xdrs, &(cap->prog)) &&
 144             xdr_u_long(xdrs, &(cap->vers)) &&
 145             xdr_u_long(xdrs, &(cap->proc))) {
 146                 lenposition = XDR_GETPOS(xdrs);
 147                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 148                     return (FALSE);
 149                 argposition = XDR_GETPOS(xdrs);
 150                 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
 151                     return (FALSE);
 152                 position = XDR_GETPOS(xdrs);
 153                 cap->arglen = (u_long)position - (u_long)argposition;
 154                 XDR_SETPOS(xdrs, lenposition);
 155                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 156                     return (FALSE);
 157                 XDR_SETPOS(xdrs, position);
 158                 return (TRUE);
 159         }
 160         return (FALSE);
 161 }
 162
 163 /*
 164  * XDR remote call results
 165  * written for XDR_DECODE direction only
 166  */
 167 bool_t
 168 xdr_rmtcallres(xdrs, crp)
 169         register XDR *xdrs;
 170         register struct rmtcallres *crp;
 171 {
 172         caddr_t port_ptr;
 173
 174         port_ptr = (caddr_t)crp->port_ptr;
 175         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),
 176             xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 177                 crp->port_ptr = (u_long *)port_ptr;
 178                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 179         }
 180         return (FALSE);
 181 }
 182
 183
 184 /*
 185  * The following is kludged-up support for simple rpc broadcasts.
 186  * Someday a large, complicated system will replace these trivial
 187  * routines which only support udp/ip .
 188  */
 189
 190 static int
 191 getbroadcastnets(addrs, sock, buf)
 192         struct in_addr *addrs;
 193         int sock;  /* any valid socket will do */
 194         char *buf;  /* why allocxate more when we can use existing... */
 195 {
 196         struct ifconf ifc;
 197         struct ifreq ifreq, *ifr;
 198         struct sockaddr_in *sin;
 199         char *cp, *cplim;
 200         int i = 0;
 201
 202         ifc.ifc_len = UDPMSGSIZE;
 203         ifc.ifc_buf = buf;
 204         if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 205                 perror("broadcast: ioctl (get interface configuration)");
 206                 return (0);
 207         }
 208 #define max(a, b) (a > b ? a : b)
 209 #define size(p) max((p).sa_len, sizeof(p))
 210         cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
 211         for (cp = buf; cp < cplim;
 212                         cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
 213                 ifr = (struct ifreq *)cp;
 214                 if (ifr->ifr_addr.sa_family != AF_INET)
 215                         continue;
 216                 ifreq = *ifr;
 217                 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 218                         perror("broadcast: ioctl (get interface flags)");
 219                         continue;
 220                 }
 221                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 222                     (ifreq.ifr_flags & IFF_UP)) {
 223                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 224 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 225                         if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 226                                 addrs[i++] =
 227                                     inet_makeaddr(inet_netof(sin->sin_addr),
 228                                     INADDR_ANY);
 229                         } else {
 230                                 addrs[i++] = ((struct sockaddr_in*)
 231                                   &ifreq.ifr_addr)->sin_addr;
 232                         }
 233 #else /* 4.2 BSD */
 234                         addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr),
 235                             INADDR_ANY);
 236 #endif
 237                 }
 238         }
 239         return (i);
 240 }
 241
 242 typedef bool_t (*resultproc_t)();
 243
 244 enum clnt_stat
 245 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 246         u_long          prog;           /* program number */
 247         u_long          vers;           /* version number */
 248         u_long          proc;           /* procedure number */
 249         xdrproc_t       xargs;          /* xdr routine for args */
 250         caddr_t         argsp;          /* pointer to args */
 251         xdrproc_t       xresults;       /* xdr routine for results */
 252         caddr_t         resultsp;       /* pointer to results */
 253         resultproc_t    eachresult;     /* call with each result obtained */
 254 {
 255         enum clnt_stat stat;
 256         AUTH *unix_auth = authunix_create_default();
 257         XDR xdr_stream;
 258         register XDR *xdrs = &xdr_stream;
 259         int outlen, inlen, fromlen, nets;
 260         register int sock;
 261         int on = 1;
 262         fd_set mask;
 263         fd_set readfds;
 264         register int i;
 265         bool_t done = FALSE;
 266         u_long xid;
 267         u_long port;
 268         struct in_addr addrs[20];
 269         struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
 270         struct rmtcallargs a;
 271         struct rmtcallres r;
 272         struct rpc_msg msg;
 273         struct timeval t;
 274         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 275         int rfd;
 276
 277         /*
 278          * initialization: create a socket, a broadcast address, and
 279          * preserialize the arguments into a send buffer.
 280          */
 281         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 282                 perror("Cannot create socket for broadcast rpc");
 283                 stat = RPC_CANTSEND;
 284                 goto done_broad;
 285         }
 286 #ifdef SO_BROADCAST
 287         if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 288                 perror("Cannot set socket option SO_BROADCAST");
 289                 stat = RPC_CANTSEND;
 290                 goto done_broad;
 291         }
 292 #endif /* def SO_BROADCAST */
 293         FD_ZERO(&mask);
 294         FD_SET(sock, &mask);
 295         nets = getbroadcastnets(addrs, sock, inbuf);
 296         bzero((char *)&baddr, sizeof (baddr));
 297         baddr.sin_family = AF_INET;
 298         baddr.sin_port = htons(PMAPPORT);
 299         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 300 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 301
 302         rfd = open("/dev/random", O_RDONLY, 0);
 303         if ((rfd < 0) || (read(rfd, &xid, sizeof(xid)) != sizeof(xid)))
 304         {
 305                 gettimeofday(&t, (struct timezone *)0);
 306                 xid = getpid() ^ t.tv_sec ^ t.tv_usec;
 307         }
 308         if (rfd > 0) close(rfd);
 309
 310         t.tv_usec = 0;
 311         msg.rm_xid = xid;
 312         msg.rm_direction = CALL;
 313         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 314         msg.rm_call.cb_prog = PMAPPROG;
 315         msg.rm_call.cb_vers = PMAPVERS;
 316         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 317         msg.rm_call.cb_cred = unix_auth->ah_cred;
 318         msg.rm_call.cb_verf = unix_auth->ah_verf;
 319         a.prog = prog;
 320         a.vers = vers;
 321         a.proc = proc;
 322         a.xdr_args = xargs;
 323         a.args_ptr = argsp;
 324         r.port_ptr = &port;
 325         r.xdr_results = xresults;
 326         r.results_ptr = resultsp;
 327         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 328         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 329                 stat = RPC_CANTENCODEARGS;
 330                 goto done_broad;
 331         }
 332         outlen = (int)xdr_getpos(xdrs);
 333         xdr_destroy(xdrs);
 334         /*
 335          * Basic loop: broadcast a packet and wait a while for response(s).
 336          * The response timeout grows larger per iteration.
 337          */
 338         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 339                 for (i = 0; i < nets; i++) {
 340                         baddr.sin_addr = addrs[i];
 341                         if (sendto(sock, outbuf, outlen, 0,
 342                                 (struct sockaddr *)&baddr,
 343                                 sizeof (struct sockaddr)) != outlen) {
 344                                 perror("Cannot send broadcast packet");
 345                                 stat = RPC_CANTSEND;
 346                                 goto done_broad;
 347                         }
 348                 }
 349                 if (eachresult == NULL) {
 350                         stat = RPC_SUCCESS;
 351                         goto done_broad;
 352                 }
 353         recv_again:
 354                 msg.acpted_rply.ar_verf = _null_auth;
 355                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 356                 msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
 357                 readfds = mask;
 358                 switch (select(sock+1, &readfds, NULL, NULL, &t)) {
 359
 360                 case 0:  /* timed out */
 361                         stat = RPC_TIMEDOUT;
 362                         continue;
 363
 364                 case -1:  /* some kind of error */
 365                         if (errno == EINTR)
 366                                 goto recv_again;
 367                         perror("Broadcast select problem");
 368                         stat = RPC_CANTRECV;
 369                         goto done_broad;
 370
 371                 }  /* end of select results switch */
 372         try_again:
 373                 fromlen = sizeof(struct sockaddr);
 374                 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0,
 375                         (struct sockaddr *)&raddr, &fromlen);
 376                 if (inlen < 0) {
 377                         if (errno == EINTR)
 378                                 goto try_again;
 379                         perror("Cannot receive reply to broadcast");
 380                         stat = RPC_CANTRECV;
 381                         goto done_broad;
 382                 }
 383                 if (inlen < sizeof(u_long))
 384                         goto recv_again;
 385                 /*
 386                  * see if reply transaction id matches sent id.
 387                  * If so, decode the results.
 388                  */
 389                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 390                 if (xdr_replymsg(xdrs, &msg)) {
 391                         if ((msg.rm_xid == xid) &&
 392                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 393                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 394                                 raddr.sin_port = htons((u_short)port);
 395                                 done = (*eachresult)(resultsp, &raddr);
 396                         }
 397                         /* otherwise, we just ignore the errors ... */
 398                 } else {
 399 #ifdef notdef
 400                         /* some kind of deserialization problem ... */
 401                         if (msg.rm_xid == xid)
 402                                 fprintf(stderr, "Broadcast deserialization problem");
 403                         /* otherwise, just random garbage */
 404 #endif
 405                 }
 406                 xdrs->x_op = XDR_FREE;
 407                 msg.acpted_rply.ar_results.proc = xdr_void;
 408                 (void)xdr_replymsg(xdrs, &msg);
 409                 (void)(*xresults)(xdrs, resultsp);
 410                 xdr_destroy(xdrs);
 411                 if (done) {
 412                         stat = RPC_SUCCESS;
 413                         goto done_broad;
 414                 } else {
 415                         goto recv_again;
 416                 }
 417         }
 418 done_broad:
 419         (void)close(sock);
 420         AUTH_DESTROY(unix_auth);
 421         return (stat);
 422 }
 423