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 <rpc/rpc.h>
  45 #include <rpc/pmap_prot.h>
  46 #include <rpc/pmap_clnt.h>
  47 #include <rpc/pmap_rmt.h>
  48 #include <sys/socket.h>
  49 #include <stdio.h>
  50 #include <errno.h>
  51 #undef   _POSIX_SOURCE          /* Ultrix <sys/param.h> needs --roland@gnu */
  52 #include <sys/param.h>          /* Ultrix needs before net/if --roland@gnu */
  53 #include <net/if.h>
  54 #include <sys/ioctl.h>
  55 #include <arpa/inet.h>
  56 #define MAX_BROADCAST_SIZE 1400
  57
  58 static struct timeval timeout = {3, 0};
  59
  60 /*
  61  * pmapper remote-call-service interface.
  62  * This routine is used to call the pmapper remote call service
  63  * which will look up a service program in the port maps, and then
  64  * remotely call that routine with the given parameters.  This allows
  65  * programs to do a lookup and call in one step.
  66  */
  67 enum clnt_stat
  68 pmap_rmtcall (addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  69      struct sockaddr_in *addr;
  70      u_long prog, vers, proc;
  71      xdrproc_t xdrargs, xdrres;
  72      caddr_t argsp, resp;
  73      struct timeval tout;
  74      u_long *port_ptr;
  75 {
  76   int socket = -1;
  77   CLIENT *client;
  78   struct rmtcallargs a;
  79   struct rmtcallres r;
  80   enum clnt_stat stat;
  81
  82   addr->sin_port = htons (PMAPPORT);
  83   client = clntudp_create (addr, PMAPPROG, PMAPVERS, timeout, &socket);
  84   if (client != (CLIENT *) NULL)
  85     {
  86       a.prog = prog;
  87       a.vers = vers;
  88       a.proc = proc;
  89       a.args_ptr = argsp;
  90       a.xdr_args = xdrargs;
  91       r.port_ptr = port_ptr;
  92       r.results_ptr = resp;
  93       r.xdr_results = xdrres;
  94       stat = CLNT_CALL (client, PMAPPROC_CALLIT, (xdrproc_t)xdr_rmtcall_args,
  95                         (caddr_t)&a, (xdrproc_t)xdr_rmtcallres,
  96                         (caddr_t)&r, tout);
  97       CLNT_DESTROY (client);
  98     }
  99   else
 100     {
 101       stat = RPC_FAILED;
 102     }
 103   /* (void)close(socket); CLNT_DESTROY already closed it */
 104   addr->sin_port = 0;
 105   return stat;
 106 }
 107
 108
 109 /*
 110  * XDR remote call arguments
 111  * written for XDR_ENCODE direction only
 112  */
 113 bool_t
 114 xdr_rmtcall_args (xdrs, cap)
 115      XDR *xdrs;
 116      struct rmtcallargs *cap;
 117 {
 118   u_int lenposition, argposition, position;
 119
 120   if (xdr_u_long (xdrs, &(cap->prog)) &&
 121       xdr_u_long (xdrs, &(cap->vers)) &&
 122       xdr_u_long (xdrs, &(cap->proc)))
 123     {
 124       lenposition = XDR_GETPOS (xdrs);
 125       if (!xdr_u_long (xdrs, &(cap->arglen)))
 126         return FALSE;
 127       argposition = XDR_GETPOS (xdrs);
 128       if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
 129         return FALSE;
 130       position = XDR_GETPOS (xdrs);
 131       cap->arglen = (u_long) position - (u_long) argposition;
 132       XDR_SETPOS (xdrs, lenposition);
 133       if (!xdr_u_long (xdrs, &(cap->arglen)))
 134         return FALSE;
 135       XDR_SETPOS (xdrs, position);
 136       return TRUE;
 137     }
 138   return FALSE;
 139 }
 140
 141 /*
 142  * XDR remote call results
 143  * written for XDR_DECODE direction only
 144  */
 145 bool_t
 146 xdr_rmtcallres (xdrs, crp)
 147      XDR *xdrs;
 148      struct rmtcallres *crp;
 149 {
 150   caddr_t port_ptr;
 151
 152   port_ptr = (caddr_t) crp->port_ptr;
 153   if (xdr_reference (xdrs, &port_ptr, sizeof (u_long), (xdrproc_t) xdr_u_long)
 154       && xdr_u_long (xdrs, &crp->resultslen))
 155     {
 156       crp->port_ptr = (u_long *) port_ptr;
 157       return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
 158     }
 159   return FALSE;
 160 }
 161
 162
 163 /*
 164  * The following is kludged-up support for simple rpc broadcasts.
 165  * Someday a large, complicated system will replace these trivial
 166  * routines which only support udp/ip .
 167  */
 168
 169 static int
 170 internal_function
 171 getbroadcastnets (struct in_addr *addrs, int sock, char *buf)
 172   /* int sock:  any valid socket will do */
 173   /* char *buf: why allocate more when we can use existing... */
 174 {
 175   struct ifconf ifc;
 176   struct ifreq ifreq, *ifr;
 177   struct sockaddr_in *sin;
 178   int n, i;
 179
 180   ifc.ifc_len = UDPMSGSIZE;
 181   ifc.ifc_buf = buf;
 182   if (ioctl (sock, SIOCGIFCONF, (char *) &ifc) < 0)
 183     {
 184       perror (_("broadcast: ioctl (get interface configuration)"));
 185       return (0);
 186     }
 187   ifr = ifc.ifc_req;
 188   for (i = 0, n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
 189     {
 190       ifreq = *ifr;
 191       if (ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
 192         {
 193           perror (_("broadcast: ioctl (get interface flags)"));
 194           continue;
 195         }
 196       if ((ifreq.ifr_flags & IFF_BROADCAST) &&
 197           (ifreq.ifr_flags & IFF_UP) &&
 198           ifr->ifr_addr.sa_family == AF_INET)
 199         {
 200           sin = (struct sockaddr_in *) &ifr->ifr_addr;
 201 #ifdef SIOCGIFBRDADDR           /* 4.3BSD */
 202           if (ioctl (sock, SIOCGIFBRDADDR, (char *) &ifreq) < 0)
 203             {
 204               addrs[i++] = inet_makeaddr (inet_netof
 205               /* Changed to pass struct instead of s_addr member
 206                  by roland@gnu.  */
 207                                           (sin->sin_addr), INADDR_ANY);
 208             }
 209           else
 210             {
 211               addrs[i++] = ((struct sockaddr_in *)
 212                             &ifreq.ifr_addr)->sin_addr;
 213             }
 214 #else /* 4.2 BSD */
 215           addrs[i++] = inet_makeaddr (inet_netof
 216                                       (sin->sin_addr.s_addr), INADDR_ANY);
 217 #endif
 218         }
 219     }
 220   return i;
 221 }
 222
 223
 224 enum clnt_stat
 225 clnt_broadcast (prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 226      u_long prog;               /* program number */
 227      u_long vers;               /* version number */
 228      u_long proc;               /* procedure number */
 229      xdrproc_t xargs;           /* xdr routine for args */
 230      caddr_t argsp;             /* pointer to args */
 231      xdrproc_t xresults;        /* xdr routine for results */
 232      caddr_t resultsp;          /* pointer to results */
 233      resultproc_t eachresult;   /* call with each result obtained */
 234 {
 235   enum clnt_stat stat;
 236   AUTH *unix_auth = authunix_create_default ();
 237   XDR xdr_stream;
 238   XDR *xdrs = &xdr_stream;
 239   int outlen, inlen, nets;
 240   size_t fromlen;
 241   int sock;
 242   int on = 1;
 243 #ifdef FD_SETSIZE
 244   fd_set mask;
 245   fd_set readfds;
 246 #else
 247   int readfds;
 248   int mask;
 249 #endif /* def FD_SETSIZE */
 250   int i;
 251   bool_t done = FALSE;
 252   u_long xid;
 253   u_long port;
 254   struct in_addr addrs[20];
 255   struct sockaddr_in baddr, raddr;      /* broadcast and response addresses */
 256   struct rmtcallargs a;
 257   struct rmtcallres r;
 258   struct rpc_msg msg;
 259   struct timeval t, t1;
 260   char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 261
 262   /*
 263    * initialization: create a socket, a broadcast address, and
 264    * preserialize the arguments into a send buffer.
 265    */
 266   if ((sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
 267     {
 268       perror (_("Cannot create socket for broadcast rpc"));
 269       stat = RPC_CANTSEND;
 270       goto done_broad;
 271     }
 272 #ifdef SO_BROADCAST
 273   if (setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
 274     {
 275       perror (_("Cannot set socket option SO_BROADCAST"));
 276       stat = RPC_CANTSEND;
 277       goto done_broad;
 278     }
 279 #endif /* def SO_BROADCAST */
 280 #ifdef FD_SETSIZE
 281   FD_ZERO (&mask);
 282   FD_SET (sock, &mask);
 283 #else
 284   mask = (1 << sock);
 285 #endif /* def FD_SETSIZE */
 286   nets = getbroadcastnets (addrs, sock, inbuf);
 287   bzero ((char *) &baddr, sizeof (baddr));
 288   baddr.sin_family = AF_INET;
 289   baddr.sin_port = htons (PMAPPORT);
 290   baddr.sin_addr.s_addr = htonl (INADDR_ANY);
 291 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 292   (void) gettimeofday (&t, (struct timezone *) 0);
 293   msg.rm_xid = xid = getpid () ^ t.tv_sec ^ t.tv_usec;
 294   t.tv_usec = 0;
 295   msg.rm_direction = CALL;
 296   msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 297   msg.rm_call.cb_prog = PMAPPROG;
 298   msg.rm_call.cb_vers = PMAPVERS;
 299   msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 300   msg.rm_call.cb_cred = unix_auth->ah_cred;
 301   msg.rm_call.cb_verf = unix_auth->ah_verf;
 302   a.prog = prog;
 303   a.vers = vers;
 304   a.proc = proc;
 305   a.xdr_args = xargs;
 306   a.args_ptr = argsp;
 307   r.port_ptr = &port;
 308   r.xdr_results = xresults;
 309   r.results_ptr = resultsp;
 310   xdrmem_create (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 311   if ((!xdr_callmsg (xdrs, &msg)) || (!xdr_rmtcall_args (xdrs, &a)))
 312     {
 313       stat = RPC_CANTENCODEARGS;
 314       goto done_broad;
 315     }
 316   outlen = (int) xdr_getpos (xdrs);
 317   xdr_destroy (xdrs);
 318   /*
 319    * Basic loop: broadcast a packet and wait a while for response(s).
 320    * The response timeout grows larger per iteration.
 321    */
 322   for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
 323     {
 324       for (i = 0; i < nets; i++)
 325         {
 326           baddr.sin_addr = addrs[i];
 327           if (sendto (sock, outbuf, outlen, 0,
 328                       (struct sockaddr *) &baddr,
 329                       sizeof (struct sockaddr)) != outlen)
 330             {
 331               perror (_("Cannot send broadcast packet"));
 332               stat = RPC_CANTSEND;
 333               goto done_broad;
 334             }
 335         }
 336       if (eachresult == NULL)
 337         {
 338           stat = RPC_SUCCESS;
 339           goto done_broad;
 340         }
 341     recv_again:
 342       msg.acpted_rply.ar_verf = _null_auth;
 343       msg.acpted_rply.ar_results.where = (caddr_t) & r;
 344       msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_rmtcallres;
 345       readfds = mask;
 346       t1 = t;
 347       switch (select (_rpc_dtablesize (), &readfds, (fd_set *) NULL,
 348                       (fd_set *) NULL, &t1))
 349         {
 350
 351         case 0:         /* timed out */
 352           stat = RPC_TIMEDOUT;
 353           continue;
 354
 355         case -1:                /* some kind of error */
 356           if (errno == EINTR)
 357             goto recv_again;
 358           perror (_("Broadcast select problem"));
 359           stat = RPC_CANTRECV;
 360           goto done_broad;
 361
 362         }                       /* end of select results switch */
 363     try_again:
 364       fromlen = sizeof (struct sockaddr);
 365       inlen = recvfrom (sock, inbuf, UDPMSGSIZE, 0,
 366                         (struct sockaddr *) &raddr, &fromlen);
 367       if (inlen < 0)
 368         {
 369           if (errno == EINTR)
 370             goto try_again;
 371           perror (_("Cannot receive reply to broadcast"));
 372           stat = RPC_CANTRECV;
 373           goto done_broad;
 374         }
 375       if ((size_t) inlen < sizeof (u_long))
 376         goto recv_again;
 377       /*
 378        * see if reply transaction id matches sent id.
 379        * If so, decode the results.
 380        */
 381       xdrmem_create (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
 382       if (xdr_replymsg (xdrs, &msg))
 383         {
 384           if ((msg.rm_xid == xid) &&
 385               (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 386               (msg.acpted_rply.ar_stat == SUCCESS))
 387             {
 388               raddr.sin_port = htons ((u_short) port);
 389               done = (*eachresult) (resultsp, &raddr);
 390             }
 391           /* otherwise, we just ignore the errors ... */
 392         }
 393       else
 394         {
 395 #ifdef notdef
 396           /* some kind of deserialization problem ... */
 397           if (msg.rm_xid == xid)
 398             fprintf (stderr, "Broadcast deserialization problem");
 399           /* otherwise, just random garbage */
 400 #endif
 401         }
 402       xdrs->x_op = XDR_FREE;
 403       msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
 404       (void) xdr_replymsg (xdrs, &msg);
 405       (void) (*xresults) (xdrs, resultsp);
 406       xdr_destroy (xdrs);
 407       if (done)
 408         {
 409           stat = RPC_SUCCESS;
 410           goto done_broad;
 411         }
 412       else
 413         {
 414           goto recv_again;
 415         }
 416     }
 417 done_broad:
 418   (void) close (sock);
 419   AUTH_DESTROY (unix_auth);
 420   return stat;
 421 }