sunrpc/pmap_rmt.c

   1 /* @(#)pmap_rmt.c       2.2 88/08/01 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if !defined(lint) && defined(SCCSIDS)
  31 static char sccsid[] = "@(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * pmap_rmt.c
  36  * Client interface to pmap rpc service.
  37  * remote call and broadcast service
  38  *
  39  * Copyright (C) 1984, Sun Microsystems, Inc.
  40  */
  41
  42 #include <unistd.h>
  43 #include <string.h>
  44 #include <libintl.h>
  45 #include <rpc/rpc.h>
  46 #include <rpc/pmap_prot.h>
  47 #include <rpc/pmap_clnt.h>
  48 #include <rpc/pmap_rmt.h>
  49 #include <sys/poll.h>
  50 #include <sys/socket.h>
  51 #include <stdio.h>
  52 #include <errno.h>
  53 #undef   _POSIX_SOURCE          /* Ultrix <sys/param.h> needs --roland@gnu */
  54 #include <sys/param.h>          /* Ultrix needs before net/if --roland@gnu */
  55 #include <net/if.h>
  56 #include <ifaddrs.h>
  57 #include <sys/ioctl.h>
  58 #include <arpa/inet.h>
  59 #define MAX_BROADCAST_SIZE 1400
  60
  61 extern u_long _create_xid (void);
  62
  63 static const struct timeval timeout = {3, 0};
  64
  65 bool_t xdr_rmtcall_args_internal (XDR *xdrs, struct rmtcallargs *cap)
  66   attribute_hidden;
  67
  68
  69 /*
  70  * pmapper remote-call-service interface.
  71  * This routine is used to call the pmapper remote call service
  72  * which will look up a service program in the port maps, and then
  73  * remotely call that routine with the given parameters.  This allows
  74  * programs to do a lookup and call in one step.
  75  */
  76 enum clnt_stat
  77 pmap_rmtcall (addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  78      struct sockaddr_in *addr;
  79      u_long prog, vers, proc;
  80      xdrproc_t xdrargs, xdrres;
  81      caddr_t argsp, resp;
  82      struct timeval tout;
  83      u_long *port_ptr;
  84 {
  85   int socket = -1;
  86   CLIENT *client;
  87   struct rmtcallargs a;
  88   struct rmtcallres r;
  89   enum clnt_stat stat;
  90
  91   addr->sin_port = htons (PMAPPORT);
  92   client = INTUSE(clntudp_create) (addr, PMAPPROG, PMAPVERS, timeout, &socket);
  93   if (client != (CLIENT *) NULL)
  94     {
  95       a.prog = prog;
  96       a.vers = vers;
  97       a.proc = proc;
  98       a.args_ptr = argsp;
  99       a.xdr_args = xdrargs;
 100       r.port_ptr = port_ptr;
 101       r.results_ptr = resp;
 102       r.xdr_results = xdrres;
 103       stat = CLNT_CALL (client, PMAPPROC_CALLIT,
 104                         (xdrproc_t)INTUSE(xdr_rmtcall_args),
 105                         (caddr_t)&a, (xdrproc_t)INTUSE(xdr_rmtcallres),
 106                         (caddr_t)&r, tout);
 107       CLNT_DESTROY (client);
 108     }
 109   else
 110     {
 111       stat = RPC_FAILED;
 112     }
 113   /* (void)__close(socket); CLNT_DESTROY already closed it */
 114   addr->sin_port = 0;
 115   return stat;
 116 }
 117
 118
 119 /*
 120  * XDR remote call arguments
 121  * written for XDR_ENCODE direction only
 122  */
 123 bool_t
 124 xdr_rmtcall_args (XDR *xdrs, struct rmtcallargs *cap)
 125 {
 126   u_int lenposition, argposition, position;
 127
 128   if (INTUSE(xdr_u_long) (xdrs, &(cap->prog)) &&
 129       INTUSE(xdr_u_long) (xdrs, &(cap->vers)) &&
 130       INTUSE(xdr_u_long) (xdrs, &(cap->proc)))
 131     {
 132       u_long dummy_arglen = 0;
 133       lenposition = XDR_GETPOS (xdrs);
 134       if (!INTUSE(xdr_u_long) (xdrs, &dummy_arglen))
 135         return FALSE;
 136       argposition = XDR_GETPOS (xdrs);
 137       if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
 138         return FALSE;
 139       position = XDR_GETPOS (xdrs);
 140       cap->arglen = (u_long) position - (u_long) argposition;
 141       XDR_SETPOS (xdrs, lenposition);
 142       if (!INTUSE(xdr_u_long) (xdrs, &(cap->arglen)))
 143         return FALSE;
 144       XDR_SETPOS (xdrs, position);
 145       return TRUE;
 146     }
 147   return FALSE;
 148 }
 149 INTDEF(xdr_rmtcall_args)
 150
 151 /*
 152  * XDR remote call results
 153  * written for XDR_DECODE direction only
 154  */
 155 bool_t
 156 xdr_rmtcallres (xdrs, crp)
 157      XDR *xdrs;
 158      struct rmtcallres *crp;
 159 {
 160   caddr_t port_ptr;
 161
 162   port_ptr = (caddr_t) crp->port_ptr;
 163   if (INTUSE(xdr_reference) (xdrs, &port_ptr, sizeof (u_long),
 164                              (xdrproc_t) INTUSE(xdr_u_long))
 165       && INTUSE(xdr_u_long) (xdrs, &crp->resultslen))
 166     {
 167       crp->port_ptr = (u_long *) port_ptr;
 168       return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
 169     }
 170   return FALSE;
 171 }
 172 INTDEF(xdr_rmtcallres)
 173
 174
 175 /*
 176  * The following is kludged-up support for simple rpc broadcasts.
 177  * Someday a large, complicated system will replace these trivial
 178  * routines which only support udp/ip .
 179  */
 180
 181 static int
 182 internal_function
 183 getbroadcastnets (struct in_addr *addrs, int naddrs)
 184 {
 185   struct ifaddrs *ifa;
 186
 187   if (getifaddrs (&ifa) != 0)
 188     {
 189       perror ("broadcast: getifaddrs");
 190       return 0;
 191     }
 192
 193   int i = 0;
 194   struct ifaddrs *run = ifa;
 195   while (run != NULL && i < naddrs)
 196     {
 197       if ((run->ifa_flags & IFF_BROADCAST) != 0
 198           && (run->ifa_flags & IFF_UP) != 0
 199           && run->ifa_addr != NULL
 200           && run->ifa_addr->sa_family == AF_INET)
 201         /* Copy the broadcast address.  */
 202         addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr;
 203
 204       run = run->ifa_next;
 205     }
 206
 207   freeifaddrs (ifa);
 208
 209   return i;
 210 }
 211
 212
 213 enum clnt_stat
 214 clnt_broadcast (prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 215      u_long prog;               /* program number */
 216      u_long vers;               /* version number */
 217      u_long proc;               /* procedure number */
 218      xdrproc_t xargs;           /* xdr routine for args */
 219      caddr_t argsp;             /* pointer to args */
 220      xdrproc_t xresults;        /* xdr routine for results */
 221      caddr_t resultsp;          /* pointer to results */
 222      resultproc_t eachresult;   /* call with each result obtained */
 223 {
 224   enum clnt_stat stat = RPC_FAILED;
 225   AUTH *unix_auth = INTUSE(authunix_create_default) ();
 226   XDR xdr_stream;
 227   XDR *xdrs = &xdr_stream;
 228   struct timeval t;
 229   int outlen, inlen, nets;
 230   socklen_t fromlen;
 231   int sock;
 232   int on = 1;
 233   struct pollfd fd;
 234   int milliseconds;
 235   int i;
 236   bool_t done = FALSE;
 237   u_long xid;
 238   u_long port;
 239   struct in_addr addrs[20];
 240   struct sockaddr_in baddr, raddr;      /* broadcast and response addresses */
 241   struct rmtcallargs a;
 242   struct rmtcallres r;
 243   struct rpc_msg msg;
 244   char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 245
 246   /*
 247    * initialization: create a socket, a broadcast address, and
 248    * preserialize the arguments into a send buffer.
 249    */
 250   if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
 251     {
 252       perror (_("Cannot create socket for broadcast rpc"));
 253       stat = RPC_CANTSEND;
 254       goto done_broad;
 255     }
 256 #ifdef SO_BROADCAST
 257   if (__setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
 258     {
 259       perror (_("Cannot set socket option SO_BROADCAST"));
 260       stat = RPC_CANTSEND;
 261       goto done_broad;
 262     }
 263 #endif /* def SO_BROADCAST */
 264   fd.fd = sock;
 265   fd.events = POLLIN;
 266   nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0]));
 267   __bzero ((char *) &baddr, sizeof (baddr));
 268   baddr.sin_family = AF_INET;
 269   baddr.sin_port = htons (PMAPPORT);
 270   baddr.sin_addr.s_addr = htonl (INADDR_ANY);
 271 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 272   msg.rm_xid = xid = _create_xid ();
 273   t.tv_usec = 0;
 274   msg.rm_direction = CALL;
 275   msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 276   msg.rm_call.cb_prog = PMAPPROG;
 277   msg.rm_call.cb_vers = PMAPVERS;
 278   msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 279   msg.rm_call.cb_cred = unix_auth->ah_cred;
 280   msg.rm_call.cb_verf = unix_auth->ah_verf;
 281   a.prog = prog;
 282   a.vers = vers;
 283   a.proc = proc;
 284   a.xdr_args = xargs;
 285   a.args_ptr = argsp;
 286   r.port_ptr = &port;
 287   r.xdr_results = xresults;
 288   r.results_ptr = resultsp;
 289   INTUSE(xdrmem_create) (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 290   if ((!INTUSE(xdr_callmsg) (xdrs, &msg))
 291       || (!INTUSE(xdr_rmtcall_args) (xdrs, &a)))
 292     {
 293       stat = RPC_CANTENCODEARGS;
 294       goto done_broad;
 295     }
 296   outlen = (int) xdr_getpos (xdrs);
 297   xdr_destroy (xdrs);
 298   /*
 299    * Basic loop: broadcast a packet and wait a while for response(s).
 300    * The response timeout grows larger per iteration.
 301    */
 302   for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
 303     {
 304       for (i = 0; i < nets; i++)
 305         {
 306           baddr.sin_addr = addrs[i];
 307           if (__sendto (sock, outbuf, outlen, 0,
 308                         (struct sockaddr *) &baddr,
 309                         sizeof (struct sockaddr)) != outlen)
 310             {
 311               perror (_("Cannot send broadcast packet"));
 312               stat = RPC_CANTSEND;
 313               goto done_broad;
 314             }
 315         }
 316       if (eachresult == NULL)
 317         {
 318           stat = RPC_SUCCESS;
 319           goto done_broad;
 320         }
 321     recv_again:
 322       msg.acpted_rply.ar_verf = _null_auth;
 323       msg.acpted_rply.ar_results.where = (caddr_t) & r;
 324       msg.acpted_rply.ar_results.proc = (xdrproc_t) INTUSE(xdr_rmtcallres);
 325       milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
 326       switch (__poll(&fd, 1, milliseconds))
 327         {
 328
 329         case 0:         /* timed out */
 330           stat = RPC_TIMEDOUT;
 331           continue;
 332
 333         case -1:                /* some kind of error */
 334           if (errno == EINTR)
 335             goto recv_again;
 336           perror (_("Broadcast poll problem"));
 337           stat = RPC_CANTRECV;
 338           goto done_broad;
 339
 340         }                       /* end of poll results switch */
 341     try_again:
 342       fromlen = sizeof (struct sockaddr);
 343       inlen = __recvfrom (sock, inbuf, UDPMSGSIZE, 0,
 344                           (struct sockaddr *) &raddr, &fromlen);
 345       if (inlen < 0)
 346         {
 347           if (errno == EINTR)
 348             goto try_again;
 349           perror (_("Cannot receive reply to broadcast"));
 350           stat = RPC_CANTRECV;
 351           goto done_broad;
 352         }
 353       if ((size_t) inlen < sizeof (u_long))
 354         goto recv_again;
 355       /*
 356        * see if reply transaction id matches sent id.
 357        * If so, decode the results.
 358        */
 359       INTUSE(xdrmem_create) (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
 360       if (INTUSE(xdr_replymsg) (xdrs, &msg))
 361         {
 362           if (((u_int32_t) msg.rm_xid == (u_int32_t) xid) &&
 363               (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 364               (msg.acpted_rply.ar_stat == SUCCESS))
 365             {
 366               raddr.sin_port = htons ((u_short) port);
 367               done = (*eachresult) (resultsp, &raddr);
 368             }
 369           /* otherwise, we just ignore the errors ... */
 370         }
 371       else
 372         {
 373 #ifdef notdef
 374           /* some kind of deserialization problem ... */
 375           if ((u_int32_t) msg.rm_xid == (u_int32_t) xid)
 376             fprintf (stderr, "Broadcast deserialization problem");
 377           /* otherwise, just random garbage */
 378 #endif
 379         }
 380       xdrs->x_op = XDR_FREE;
 381       msg.acpted_rply.ar_results.proc = (xdrproc_t)INTUSE(xdr_void);
 382       (void) INTUSE(xdr_replymsg) (xdrs, &msg);
 383       (void) (*xresults) (xdrs, resultsp);
 384       xdr_destroy (xdrs);
 385       if (done)
 386         {
 387           stat = RPC_SUCCESS;
 388           goto done_broad;
 389         }
 390       else
 391         {
 392           goto recv_again;
 393         }
 394     }
 395 done_broad:
 396   (void) __close (sock);
 397   AUTH_DESTROY (unix_auth);
 398   return stat;
 399 }