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 1.2 1999/10/14 21:56:53 wsanchez 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 <rpc/rpc.h>
  68 #include <rpc/pmap_prot.h>
  69 #include <rpc/pmap_clnt.h>
  70 #include <rpc/pmap_rmt.h>
  71 #include <sys/socket.h>
  72 #include <stdio.h>
  73 #include <errno.h>
  74 #include <net/if.h>
  75 #include <sys/ioctl.h>
  76 #include <arpa/inet.h>
  77 #define MAX_BROADCAST_SIZE 1400
  78
  79 extern int errno;
  80 static struct timeval timeout = { 3, 0 };
  81
  82
  83 /*
  84  * pmapper remote-call-service interface.
  85  * This routine is used to call the pmapper remote call service
  86  * which will look up a service program in the port maps, and then
  87  * remotely call that routine with the given parameters.  This allows
  88  * programs to do a lookup and call in one step.
  89 */
  90 enum clnt_stat
  91 pmap_rmtcall(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  92         struct sockaddr_in *addr;
  93         u_long prog, vers, proc;
  94         xdrproc_t xdrargs, xdrres;
  95         caddr_t argsp, resp;
  96         struct timeval tout;
  97         u_long *port_ptr;
  98 {
  99         int socket = -1;
 100         register CLIENT *client;
 101         struct rmtcallargs a;
 102         struct rmtcallres r;
 103         enum clnt_stat stat;
 104
 105         addr->sin_port = htons(PMAPPORT);
 106         client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);
 107         if (client != (CLIENT *)NULL) {
 108                 a.prog = prog;
 109                 a.vers = vers;
 110                 a.proc = proc;
 111                 a.args_ptr = argsp;
 112                 a.xdr_args = xdrargs;
 113                 r.port_ptr = port_ptr;
 114                 r.results_ptr = resp;
 115                 r.xdr_results = xdrres;
 116                 stat = CLNT_CALL(client, PMAPPROC_CALLIT, xdr_rmtcall_args, &a,
 117                     xdr_rmtcallres, &r, tout);
 118                 CLNT_DESTROY(client);
 119         } else {
 120                 stat = RPC_FAILED;
 121         }
 122         (void)close(socket);
 123         addr->sin_port = 0;
 124         return (stat);
 125 }
 126
 127
 128 /*
 129  * XDR remote call arguments
 130  * written for XDR_ENCODE direction only
 131  */
 132 bool_t
 133 xdr_rmtcall_args(xdrs, cap)
 134         register XDR *xdrs;
 135         register struct rmtcallargs *cap;
 136 {
 137         u_int lenposition, argposition, position;
 138
 139         if (xdr_u_long(xdrs, &(cap->prog)) &&
 140             xdr_u_long(xdrs, &(cap->vers)) &&
 141             xdr_u_long(xdrs, &(cap->proc))) {
 142                 lenposition = XDR_GETPOS(xdrs);
 143                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 144                     return (FALSE);
 145                 argposition = XDR_GETPOS(xdrs);
 146                 if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
 147                     return (FALSE);
 148                 position = XDR_GETPOS(xdrs);
 149                 cap->arglen = (u_long)position - (u_long)argposition;
 150                 XDR_SETPOS(xdrs, lenposition);
 151                 if (! xdr_u_long(xdrs, &(cap->arglen)))
 152                     return (FALSE);
 153                 XDR_SETPOS(xdrs, position);
 154                 return (TRUE);
 155         }
 156         return (FALSE);
 157 }
 158
 159 /*
 160  * XDR remote call results
 161  * written for XDR_DECODE direction only
 162  */
 163 bool_t
 164 xdr_rmtcallres(xdrs, crp)
 165         register XDR *xdrs;
 166         register struct rmtcallres *crp;
 167 {
 168         caddr_t port_ptr;
 169
 170         port_ptr = (caddr_t)crp->port_ptr;
 171         if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),
 172             xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {
 173                 crp->port_ptr = (u_long *)port_ptr;
 174                 return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
 175         }
 176         return (FALSE);
 177 }
 178
 179
 180 /*
 181  * The following is kludged-up support for simple rpc broadcasts.
 182  * Someday a large, complicated system will replace these trivial
 183  * routines which only support udp/ip .
 184  */
 185
 186 static int
 187 getbroadcastnets(addrs, sock, buf)
 188         struct in_addr *addrs;
 189         int sock;  /* any valid socket will do */
 190         char *buf;  /* why allocxate more when we can use existing... */
 191 {
 192         struct ifconf ifc;
 193         struct ifreq ifreq, *ifr;
 194         struct sockaddr_in *sin;
 195         char *cp, *cplim;
 196         int n, i = 0;
 197
 198         ifc.ifc_len = UDPMSGSIZE;
 199         ifc.ifc_buf = buf;
 200         if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
 201                 perror("broadcast: ioctl (get interface configuration)");
 202                 return (0);
 203         }
 204 #define max(a, b) (a > b ? a : b)
 205 #define size(p) max((p).sa_len, sizeof(p))
 206         cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
 207         for (cp = buf; cp < cplim;
 208                         cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
 209                 ifr = (struct ifreq *)cp;
 210                 if (ifr->ifr_addr.sa_family != AF_INET)
 211                         continue;
 212                 ifreq = *ifr;
 213                 if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
 214                         perror("broadcast: ioctl (get interface flags)");
 215                         continue;
 216                 }
 217                 if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 218                     (ifreq.ifr_flags & IFF_UP)) {
 219                         sin = (struct sockaddr_in *)&ifr->ifr_addr;
 220 #ifdef SIOCGIFBRDADDR   /* 4.3BSD */
 221                         if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
 222                                 addrs[i++] =
 223                                     inet_makeaddr(inet_netof(sin->sin_addr),
 224                                     INADDR_ANY);
 225                         } else {
 226                                 addrs[i++] = ((struct sockaddr_in*)
 227                                   &ifreq.ifr_addr)->sin_addr;
 228                         }
 229 #else /* 4.2 BSD */
 230                         addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr),
 231                             INADDR_ANY);
 232 #endif
 233                 }
 234         }
 235         return (i);
 236 }
 237
 238 typedef bool_t (*resultproc_t)();
 239
 240 enum clnt_stat
 241 clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 242         u_long          prog;           /* program number */
 243         u_long          vers;           /* version number */
 244         u_long          proc;           /* procedure number */
 245         xdrproc_t       xargs;          /* xdr routine for args */
 246         caddr_t         argsp;          /* pointer to args */
 247         xdrproc_t       xresults;       /* xdr routine for results */
 248         caddr_t         resultsp;       /* pointer to results */
 249         resultproc_t    eachresult;     /* call with each result obtained */
 250 {
 251         enum clnt_stat stat;
 252         AUTH *unix_auth = authunix_create_default();
 253         XDR xdr_stream;
 254         register XDR *xdrs = &xdr_stream;
 255         int outlen, inlen, fromlen, nets;
 256         register int sock;
 257         int on = 1;
 258         fd_set mask;
 259         fd_set readfds;
 260         register int i;
 261         bool_t done = FALSE;
 262         register u_long xid;
 263         u_long port;
 264         struct in_addr addrs[20];
 265         struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
 266         struct rmtcallargs a;
 267         struct rmtcallres r;
 268         struct rpc_msg msg;
 269         struct timeval t;
 270         char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 271
 272         /*
 273          * initialization: create a socket, a broadcast address, and
 274          * preserialize the arguments into a send buffer.
 275          */
 276         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
 277                 perror("Cannot create socket for broadcast rpc");
 278                 stat = RPC_CANTSEND;
 279                 goto done_broad;
 280         }
 281 #ifdef SO_BROADCAST
 282         if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
 283                 perror("Cannot set socket option SO_BROADCAST");
 284                 stat = RPC_CANTSEND;
 285                 goto done_broad;
 286         }
 287 #endif /* def SO_BROADCAST */
 288         FD_ZERO(&mask);
 289         FD_SET(sock, &mask);
 290         nets = getbroadcastnets(addrs, sock, inbuf);
 291         bzero((char *)&baddr, sizeof (baddr));
 292         baddr.sin_family = AF_INET;
 293         baddr.sin_port = htons(PMAPPORT);
 294         baddr.sin_addr.s_addr = htonl(INADDR_ANY);
 295 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 296         (void)gettimeofday(&t, (struct timezone *)0);
 297         msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec;
 298         t.tv_usec = 0;
 299         msg.rm_direction = CALL;
 300         msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 301         msg.rm_call.cb_prog = PMAPPROG;
 302         msg.rm_call.cb_vers = PMAPVERS;
 303         msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 304         msg.rm_call.cb_cred = unix_auth->ah_cred;
 305         msg.rm_call.cb_verf = unix_auth->ah_verf;
 306         a.prog = prog;
 307         a.vers = vers;
 308         a.proc = proc;
 309         a.xdr_args = xargs;
 310         a.args_ptr = argsp;
 311         r.port_ptr = &port;
 312         r.xdr_results = xresults;
 313         r.results_ptr = resultsp;
 314         xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 315         if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
 316                 stat = RPC_CANTENCODEARGS;
 317                 goto done_broad;
 318         }
 319         outlen = (int)xdr_getpos(xdrs);
 320         xdr_destroy(xdrs);
 321         /*
 322          * Basic loop: broadcast a packet and wait a while for response(s).
 323          * The response timeout grows larger per iteration.
 324          */
 325         for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
 326                 for (i = 0; i < nets; i++) {
 327                         baddr.sin_addr = addrs[i];
 328                         if (sendto(sock, outbuf, outlen, 0,
 329                                 (struct sockaddr *)&baddr,
 330                                 sizeof (struct sockaddr)) != outlen) {
 331                                 perror("Cannot send broadcast packet");
 332                                 stat = RPC_CANTSEND;
 333                                 goto done_broad;
 334                         }
 335                 }
 336                 if (eachresult == NULL) {
 337                         stat = RPC_SUCCESS;
 338                         goto done_broad;
 339                 }
 340         recv_again:
 341                 msg.acpted_rply.ar_verf = _null_auth;
 342                 msg.acpted_rply.ar_results.where = (caddr_t)&r;
 343                 msg.acpted_rply.ar_results.proc = xdr_rmtcallres;
 344                 readfds = mask;
 345                 switch (select(sock+1, &readfds, (int *)NULL,
 346                                (int *)NULL, &t)) {
 347
 348                 case 0:  /* timed out */
 349                         stat = RPC_TIMEDOUT;
 350                         continue;
 351
 352                 case -1:  /* some kind of error */
 353                         if (errno == EINTR)
 354                                 goto recv_again;
 355                         perror("Broadcast select problem");
 356                         stat = RPC_CANTRECV;
 357                         goto done_broad;
 358
 359                 }  /* end of select results switch */
 360         try_again:
 361                 fromlen = sizeof(struct sockaddr);
 362                 inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0,
 363                         (struct sockaddr *)&raddr, &fromlen);
 364                 if (inlen < 0) {
 365                         if (errno == EINTR)
 366                                 goto try_again;
 367                         perror("Cannot receive reply to broadcast");
 368                         stat = RPC_CANTRECV;
 369                         goto done_broad;
 370                 }
 371                 if (inlen < sizeof(u_long))
 372                         goto recv_again;
 373                 /*
 374                  * see if reply transaction id matches sent id.
 375                  * If so, decode the results.
 376                  */
 377                 xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
 378                 if (xdr_replymsg(xdrs, &msg)) {
 379                         if ((msg.rm_xid == xid) &&
 380                                 (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 381                                 (msg.acpted_rply.ar_stat == SUCCESS)) {
 382                                 raddr.sin_port = htons((u_short)port);
 383                                 done = (*eachresult)(resultsp, &raddr);
 384                         }
 385                         /* otherwise, we just ignore the errors ... */
 386                 } else {
 387 #ifdef notdef
 388                         /* some kind of deserialization problem ... */
 389                         if (msg.rm_xid == xid)
 390                                 fprintf(stderr, "Broadcast deserialization problem");
 391                         /* otherwise, just random garbage */
 392 #endif
 393                 }
 394                 xdrs->x_op = XDR_FREE;
 395                 msg.acpted_rply.ar_results.proc = xdr_void;
 396                 (void)xdr_replymsg(xdrs, &msg);
 397                 (void)(*xresults)(xdrs, resultsp);
 398                 xdr_destroy(xdrs);
 399                 if (done) {
 400                         stat = RPC_SUCCESS;
 401                         goto done_broad;
 402                 } else {
 403                         goto recv_again;
 404                 }
 405         }
 406 done_broad:
 407         (void)close(sock);
 408         AUTH_DESTROY(unix_auth);
 409         return (stat);
 410 }
 411