rpc.subproj/pmap_rmt.c

   1 /*
   2  * Copyright (c) 1999-2018 Apple 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 "libinfo_common.h"
  68
  69 #include <string.h>
  70 #include <unistd.h>
  71 #include <rpc/rpc.h>
  72 #include <rpc/pmap_prot.h>
  73 #include <rpc/pmap_clnt.h>
  74 #include <rpc/pmap_rmt.h>
  75 #include <sys/socket.h>
  76 #include <sys/fcntl.h>
  77 #include <stdio.h>
  78 #include <errno.h>
  79 #include <net/if.h>
  80 #include <sys/ioctl.h>
  81 #include <arpa/inet.h>
  82 #define MAX_BROADCAST_SIZE 1400
  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 LIBINFO_EXPORT
  95 enum clnt_stat
  96 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  97 #ifdef __LP64__
  98         struct sockaddr_in *addr;
  99         uint32_t prog, vers, proc;
 100         xdrproc_t xdrargs, xdrres;
 101         caddr_t argsp, resp;
 102         struct timeval tout;
 103         uint32_t *port_ptr;
 104 #else
 105         struct sockaddr_in *addr;
 106         u_long prog, vers, proc;
 107         xdrproc_t xdrargs, xdrres;
 108         caddr_t argsp, resp;
 109         struct timeval tout;
 110         u_long *port_ptr;
 111 #endif
 112 {
 113         int socket = -1;
 114         register CLIENT *client;
 115         struct rmtcallargs a;
 116         struct rmtcallres r;
 117         enum clnt_stat stat;
 118
 119         addr->sin_port = htons(PMAPPORT);
 120         client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
 121         if (client != (CLIENT *)NULL) {
 122                 a.prog = prog;
 123                 a.vers = vers;
 124                 a.proc = proc;
 125                 a.args_ptr = argsp;
 126                 a.xdr_args = xdrargs;
 127                 r.port_ptr = port_ptr;
 128                 r.results_ptr = resp;
 129                 r.xdr_results = xdrres;
 130                 stat = CLNT_CALL(client, PMAPPROC_CALLIT, (xdrproc_t)xdr_rmtcall_args, &a, (xdrproc_t)xdr_rmtcallres, &r, tout);
 131                 CLNT_DESTROY(client);
 132         } else {
 133                 stat = RPC_FAILED;
 134         }
 135         (void)close(socket);
 136         addr->sin_port = 0;
 137         return (stat);
 138 }
 139
 140
 141 /*
 142  * XDR remote call arguments
 143  * written for XDR_ENCODE direction only
 144  */
 145 LIBINFO_EXPORT
 146 bool_t
 147 xdr_rmtcall_args(xdrs, cap)
 148         register XDR *xdrs;
 149         register struct rmtcallargs *cap;
 150 {
 151         u_int lenposition, argposition, position;
 152
 153         if (xdr_u_long(xdrs, &(cap->prog)) &&
 154             xdr_u_long(xdrs, &(cap->vers)) &&
 155             xdr_u_long(xdrs, &(cap->proc))) {
 156                 lenposition = XDR_GETPOS(xdrs);
 157                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 158                     return (FALSE);
 159                 argposition = XDR_GETPOS(xdrs);
 160                 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr, 0))
 161                     return (FALSE);
 162                 position = XDR_GETPOS(xdrs);
 163 #ifdef __LP64__
 164                 cap->arglen = (uint32_t)position - (uint32_t)argposition;
 165 #else
 166                 cap->arglen = (u_long)position - (u_long)argposition;
 167 #endif
 168                 XDR_SETPOS(xdrs, lenposition);
 169                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 170                     return (FALSE);
 171                 XDR_SETPOS(xdrs, position);
 172                 return (TRUE);
 173         }
 174         return (FALSE);
 175 }
 176
 177 /*
 178  * XDR remote call results
 179  * written for XDR_DECODE direction only
 180  */
 181 LIBINFO_EXPORT
 182 bool_t
 183 xdr_rmtcallres(xdrs, crp)
 184         register XDR *xdrs;
 185         register struct rmtcallres *crp;
 186 {
 187         caddr_t port_ptr;
 188
 189         port_ptr = (caddr_t)crp->port_ptr;
 190 #ifdef __LP64__
 191         if (xdr_reference(xdrs, &port_ptr, sizeof (uint32_t), (xdrproc_t)xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 192                 crp->port_ptr = (unsigned int *)port_ptr;
 193                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr, 0));
 194         }
 195 #else
 196         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), (xdrproc_t)xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 197                 crp->port_ptr = (unsigned long *)port_ptr;
 198                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr, 0));
 199         }
 200 #endif
 201         return (FALSE);
 202 }
 203
 204
 205 /*
 206  * The following is kludged-up support for simple rpc broadcasts.
 207  * Someday a large, complicated system will replace these trivial
 208  * routines which only support udp/ip .
 209  */
 210
 211 static int
 212 getbroadcastnets(addrs, sock, buf)
 213         struct in_addr *addrs;
 214         int sock;  /* any valid socket will do */
 215         char *buf;  /* why allocxate more when we can use existing... */
 216 {
 217         struct ifconf ifc;
 218         struct ifreq ifreq, *ifr;
 219         struct sockaddr_in *sin;
 220         char *cp, *cplim;
 221         int i = 0;
 222
 223         ifc.ifc_len = UDPMSGSIZE;
 224         ifc.ifc_buf = buf;
 225         if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 226                 perror("broadcast: ioctl (get interface configuration)");
 227                 return (0);
 228         }
 229 #define max(a, b) (a > b ? a : b)
 230 #define size(p) max((p).sa_len, sizeof(p))
 231         cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
 232         for (cp = buf; cp < cplim;
 233                         cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
 234                 ifr = (struct ifreq *)cp;
 235                 if (ifr->ifr_addr.sa_family != AF_INET)
 236                         continue;
 237                 ifreq = *ifr;
 238                 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 239                         perror("broadcast: ioctl (get interface flags)");
 240                         continue;
 241                 }
 242                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 243                     (ifreq.ifr_flags & IFF_UP)) {
 244                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 245 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 246                         if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 247                                 addrs[i++] =
 248                                     inet_makeaddr(inet_netof(sin->sin_addr),
 249                                     INADDR_ANY);
 250                         } else {
 251                                 addrs[i++] = ((struct sockaddr_in*)
 252                                   &ifreq.ifr_addr)->sin_addr;
 253                         }
 254 #else /* 4.2 BSD */
 255                         addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr),
 256                             INADDR_ANY);
 257 #endif
 258                 }
 259         }
 260         return (i);
 261 }
 262
 263 typedef bool_t (*resultproc_t)();
 264
 265 LIBINFO_EXPORT
 266 enum clnt_stat
 267 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 268 #ifdef __LP64__
 269         uint32_t prog;          /* program number */
 270         uint32_t vers;          /* version number */
 271         uint32_t proc;          /* procedure number */
 272         xdrproc_t xargs;                /* xdr routine for args */
 273         caddr_t argsp;          /* pointer to args */
 274         xdrproc_t xresults;     /* xdr routine for results */
 275         caddr_t resultsp;       /* pointer to results */
 276         resultproc_t eachresult;        /* call with each result obtained */
 277 #else
 278         u_long          prog;           /* program number */
 279         u_long          vers;           /* version number */
 280         u_long          proc;           /* procedure number */
 281         xdrproc_t       xargs;          /* xdr routine for args */
 282         caddr_t         argsp;          /* pointer to args */
 283         xdrproc_t       xresults;       /* xdr routine for results */
 284         caddr_t         resultsp;       /* pointer to results */
 285         resultproc_t    eachresult;     /* call with each result obtained */
 286 #endif
 287 {
 288         enum clnt_stat stat;
 289         AUTH *unix_auth = authunix_create_default();
 290         XDR xdr_stream;
 291         register XDR *xdrs = &xdr_stream;
 292         int outlen, inlen, nets;
 293         unsigned int fromlen;
 294         register int sock;
 295         int on = 1;
 296         fd_set mask;
 297         fd_set readfds;
 298         register int i;
 299         bool_t done = FALSE;
 300         uint32_t xid;
 301 #ifdef __LP64__
 302         unsigned int port;
 303 #else
 304         unsigned long port;
 305 #endif
 306         struct in_addr addrs[20];
 307         struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
 308         struct rmtcallargs a;
 309         struct rmtcallres r;
 310         struct rpc_msg msg;
 311         struct timeval t;
 312         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 313         int rfd;
 314
 315         stat = RPC_SUCCESS;
 316
 317         /*
 318          * initialization: create a socket, a broadcast address, and
 319          * preserialize the arguments into a send buffer.
 320          */
 321         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 322                 perror("Cannot create socket for broadcast rpc");
 323                 stat = RPC_CANTSEND;
 324                 goto done_broad;
 325         }
 326 #ifdef SO_BROADCAST
 327         if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 328                 perror("Cannot set socket option SO_BROADCAST");
 329                 stat = RPC_CANTSEND;
 330                 goto done_broad;
 331         }
 332 #endif /* def SO_BROADCAST */
 333         FD_ZERO(&mask);
 334         FD_SET(sock, &mask);
 335         nets = getbroadcastnets(addrs, sock, inbuf);
 336         bzero((char *)&baddr, sizeof (baddr));
 337         baddr.sin_family = AF_INET;
 338         baddr.sin_port = htons(PMAPPORT);
 339         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 340 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 341
 342         rfd = open("/dev/random", O_RDONLY, 0);
 343         if ((rfd < 0) || (read(rfd, &xid, sizeof(xid)) != sizeof(xid)))
 344         {
 345                 gettimeofday(&t, (struct timezone *)0);
 346                 xid = getpid() ^ t.tv_sec ^ t.tv_usec;
 347         }
 348         if (rfd > 0) close(rfd);
 349
 350         t.tv_usec = 0;
 351         msg.rm_xid = xid;
 352         msg.rm_direction = CALL;
 353         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 354         msg.rm_call.cb_prog = PMAPPROG;
 355         msg.rm_call.cb_vers = PMAPVERS;
 356         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 357         msg.rm_call.cb_cred = unix_auth->ah_cred;
 358         msg.rm_call.cb_verf = unix_auth->ah_verf;
 359         a.prog = prog;
 360         a.vers = vers;
 361         a.proc = proc;
 362         a.xdr_args = xargs;
 363         a.args_ptr = argsp;
 364         r.port_ptr = &port;
 365         r.xdr_results = xresults;
 366         r.results_ptr = resultsp;
 367         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 368         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 369                 stat = RPC_CANTENCODEARGS;
 370                 goto done_broad;
 371         }
 372         outlen = (int)xdr_getpos(xdrs);
 373         xdr_destroy(xdrs);
 374         /*
 375          * Basic loop: broadcast a packet and wait a while for response(s).
 376          * The response timeout grows larger per iteration.
 377          */
 378         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 379                 for (i = 0; i < nets; i++) {
 380                         baddr.sin_addr = addrs[i];
 381                         if (sendto(sock, outbuf, outlen, 0,
 382                                 (struct sockaddr *)&baddr,
 383                                 sizeof (struct sockaddr)) != outlen) {
 384                                 perror("Cannot send broadcast packet");
 385                                 stat = RPC_CANTSEND;
 386                                 goto done_broad;
 387                         }
 388                 }
 389                 if (eachresult == NULL) {
 390                         stat = RPC_SUCCESS;
 391                         goto done_broad;
 392                 }
 393         recv_again:
 394                 msg.acpted_rply.ar_verf = _null_auth;
 395                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 396                 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_rmtcallres;
 397                 readfds = mask;
 398                 switch (select(sock+1, &readfds, NULL, NULL, &t)) {
 399
 400                 case 0:  /* timed out */
 401                         stat = RPC_TIMEDOUT;
 402                         continue;
 403
 404                 case -1:  /* some kind of error */
 405                         if (errno == EINTR)
 406                                 goto recv_again;
 407                         perror("Broadcast select problem");
 408                         stat = RPC_CANTRECV;
 409                         goto done_broad;
 410
 411                 }  /* end of select results switch */
 412         try_again:
 413                 fromlen = sizeof(struct sockaddr);
 414                 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0, (struct sockaddr *)&raddr, &fromlen);
 415                 if (inlen < 0) {
 416                         if (errno == EINTR)
 417                                 goto try_again;
 418                         perror("Cannot receive reply to broadcast");
 419                         stat = RPC_CANTRECV;
 420                         goto done_broad;
 421                 }
 422 #ifdef __LP64__
 423                 if (inlen < sizeof(uint32_t))
 424                         goto recv_again;
 425 #else
 426                 if (inlen < sizeof(u_long))
 427                         goto recv_again;
 428 #endif
 429                 /*
 430                  * see if reply transaction id matches sent id.
 431                  * If so, decode the results.
 432                  */
 433                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 434                 if (xdr_replymsg(xdrs, &msg)) {
 435                         if ((msg.rm_xid == xid) &&
 436                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 437                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 438                                 raddr.sin_port = htons((u_short)port);
 439                                 done = (*eachresult)(resultsp, &raddr);
 440                         }
 441                         /* otherwise, we just ignore the errors ... */
 442                 } else {
 443 #ifdef notdef
 444                         /* some kind of deserialization problem ... */
 445                         if (msg.rm_xid == xid)
 446                                 fprintf(stderr, "Broadcast deserialization problem");
 447                         /* otherwise, just random garbage */
 448 #endif
 449                 }
 450                 xdrs->x_op = XDR_FREE;
 451                 msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
 452                 (void)xdr_replymsg(xdrs, &msg);
 453                 (void)(*xresults)(xdrs, resultsp, 0);
 454                 xdr_destroy(xdrs);
 455                 if (done) {
 456                         stat = RPC_SUCCESS;
 457                         goto done_broad;
 458                 } else {
 459                         goto recv_again;
 460                 }
 461         }
 462 done_broad:
 463         (void)close(sock);
 464         AUTH_DESTROY(unix_auth);
 465         return (stat);
 466 }
 467