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 /*
  66  * pmapper remote-call-service interface.
  67  * This routine is used to call the pmapper remote call service
  68  * which will look up a service program in the port maps, and then
  69  * remotely call that routine with the given parameters.  This allows
  70  * programs to do a lookup and call in one step.
  71  */
  72 enum clnt_stat
  73 pmap_rmtcall (addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)
  74      struct sockaddr_in *addr;
  75      u_long prog, vers, proc;
  76      xdrproc_t xdrargs, xdrres;
  77      caddr_t argsp, resp;
  78      struct timeval tout;
  79      u_long *port_ptr;
  80 {
  81   int socket = -1;
  82   CLIENT *client;
  83   struct rmtcallargs a;
  84   struct rmtcallres r;
  85   enum clnt_stat stat;
  86
  87   addr->sin_port = htons (PMAPPORT);
  88   client = INTUSE(clntudp_create) (addr, PMAPPROG, PMAPVERS, timeout, &socket);
  89   if (client != (CLIENT *) NULL)
  90     {
  91       a.prog = prog;
  92       a.vers = vers;
  93       a.proc = proc;
  94       a.args_ptr = argsp;
  95       a.xdr_args = xdrargs;
  96       r.port_ptr = port_ptr;
  97       r.results_ptr = resp;
  98       r.xdr_results = xdrres;
  99       stat = CLNT_CALL (client, PMAPPROC_CALLIT,
 100                         (xdrproc_t)INTUSE(xdr_rmtcall_args),
 101                         (caddr_t)&a, (xdrproc_t)INTUSE(xdr_rmtcallres),
 102                         (caddr_t)&r, tout);
 103       CLNT_DESTROY (client);
 104     }
 105   else
 106     {
 107       stat = RPC_FAILED;
 108     }
 109   /* (void)__close(socket); CLNT_DESTROY already closed it */
 110   addr->sin_port = 0;
 111   return stat;
 112 }
 113
 114
 115 /*
 116  * XDR remote call arguments
 117  * written for XDR_ENCODE direction only
 118  */
 119 bool_t
 120 xdr_rmtcall_args (XDR *xdrs, struct rmtcallargs *cap)
 121 {
 122   u_int lenposition, argposition, position;
 123
 124   if (INTUSE(xdr_u_long) (xdrs, &(cap->prog)) &&
 125       INTUSE(xdr_u_long) (xdrs, &(cap->vers)) &&
 126       INTUSE(xdr_u_long) (xdrs, &(cap->proc)))
 127     {
 128       lenposition = XDR_GETPOS (xdrs);
 129       if (!INTUSE(xdr_u_long) (xdrs, &(cap->arglen)))
 130         return FALSE;
 131       argposition = XDR_GETPOS (xdrs);
 132       if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr))
 133         return FALSE;
 134       position = XDR_GETPOS (xdrs);
 135       cap->arglen = (u_long) position - (u_long) argposition;
 136       XDR_SETPOS (xdrs, lenposition);
 137       if (!INTUSE(xdr_u_long) (xdrs, &(cap->arglen)))
 138         return FALSE;
 139       XDR_SETPOS (xdrs, position);
 140       return TRUE;
 141     }
 142   return FALSE;
 143 }
 144 INTDEF(xdr_rmtcall_args)
 145
 146 /*
 147  * XDR remote call results
 148  * written for XDR_DECODE direction only
 149  */
 150 bool_t
 151 xdr_rmtcallres (xdrs, crp)
 152      XDR *xdrs;
 153      struct rmtcallres *crp;
 154 {
 155   caddr_t port_ptr;
 156
 157   port_ptr = (caddr_t) crp->port_ptr;
 158   if (INTUSE(xdr_reference) (xdrs, &port_ptr, sizeof (u_long),
 159                              (xdrproc_t) INTUSE(xdr_u_long))
 160       && INTUSE(xdr_u_long) (xdrs, &crp->resultslen))
 161     {
 162       crp->port_ptr = (u_long *) port_ptr;
 163       return (*(crp->xdr_results)) (xdrs, crp->results_ptr);
 164     }
 165   return FALSE;
 166 }
 167 INTDEF(xdr_rmtcallres)
 168
 169
 170 /*
 171  * The following is kludged-up support for simple rpc broadcasts.
 172  * Someday a large, complicated system will replace these trivial
 173  * routines which only support udp/ip .
 174  */
 175
 176 static int
 177 internal_function
 178 getbroadcastnets (struct in_addr *addrs, int naddrs)
 179 {
 180   struct ifaddrs *ifa;
 181
 182   if (getifaddrs (&ifa) != 0)
 183     {
 184       perror ("broadcast: getifaddrs");
 185       return 0;
 186     }
 187
 188   int i = 0;
 189   struct ifaddrs *run = ifa;
 190   while (run != NULL && i < naddrs)
 191     {
 192       if ((run->ifa_flags & IFF_BROADCAST) != 0
 193           && (run->ifa_flags & IFF_UP) != 0
 194           && run->ifa_addr != NULL
 195           && run->ifa_addr->sa_family == AF_INET)
 196         /* Copy the broadcast address.  */
 197         addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr;
 198
 199       run = run->ifa_next;
 200     }
 201
 202   freeifaddrs (ifa);
 203
 204   return i;
 205 }
 206
 207
 208 enum clnt_stat
 209 clnt_broadcast (prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 210      u_long prog;               /* program number */
 211      u_long vers;               /* version number */
 212      u_long proc;               /* procedure number */
 213      xdrproc_t xargs;           /* xdr routine for args */
 214      caddr_t argsp;             /* pointer to args */
 215      xdrproc_t xresults;        /* xdr routine for results */
 216      caddr_t resultsp;          /* pointer to results */
 217      resultproc_t eachresult;   /* call with each result obtained */
 218 {
 219   enum clnt_stat stat = RPC_FAILED;
 220   AUTH *unix_auth = INTUSE(authunix_create_default) ();
 221   XDR xdr_stream;
 222   XDR *xdrs = &xdr_stream;
 223   struct timeval t;
 224   int outlen, inlen, nets;
 225   socklen_t fromlen;
 226   int sock;
 227   int on = 1;
 228   struct pollfd fd;
 229   int milliseconds;
 230   int i;
 231   bool_t done = FALSE;
 232   u_long xid;
 233   u_long port;
 234   struct in_addr addrs[20];
 235   struct sockaddr_in baddr, raddr;      /* broadcast and response addresses */
 236   struct rmtcallargs a;
 237   struct rmtcallres r;
 238   struct rpc_msg msg;
 239   char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
 240
 241   /*
 242    * initialization: create a socket, a broadcast address, and
 243    * preserialize the arguments into a send buffer.
 244    */
 245   if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
 246     {
 247       perror (_("Cannot create socket for broadcast rpc"));
 248       stat = RPC_CANTSEND;
 249       goto done_broad;
 250     }
 251 #ifdef SO_BROADCAST
 252   if (__setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0)
 253     {
 254       perror (_("Cannot set socket option SO_BROADCAST"));
 255       stat = RPC_CANTSEND;
 256       goto done_broad;
 257     }
 258 #endif /* def SO_BROADCAST */
 259   fd.fd = sock;
 260   fd.events = POLLIN;
 261   nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0]));
 262   __bzero ((char *) &baddr, sizeof (baddr));
 263   baddr.sin_family = AF_INET;
 264   baddr.sin_port = htons (PMAPPORT);
 265   baddr.sin_addr.s_addr = htonl (INADDR_ANY);
 266 /*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
 267   msg.rm_xid = xid = _create_xid ();
 268   t.tv_usec = 0;
 269   msg.rm_direction = CALL;
 270   msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 271   msg.rm_call.cb_prog = PMAPPROG;
 272   msg.rm_call.cb_vers = PMAPVERS;
 273   msg.rm_call.cb_proc = PMAPPROC_CALLIT;
 274   msg.rm_call.cb_cred = unix_auth->ah_cred;
 275   msg.rm_call.cb_verf = unix_auth->ah_verf;
 276   a.prog = prog;
 277   a.vers = vers;
 278   a.proc = proc;
 279   a.xdr_args = xargs;
 280   a.args_ptr = argsp;
 281   r.port_ptr = &port;
 282   r.xdr_results = xresults;
 283   r.results_ptr = resultsp;
 284   INTUSE(xdrmem_create) (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
 285   if ((!INTUSE(xdr_callmsg) (xdrs, &msg))
 286       || (!INTUSE(xdr_rmtcall_args) (xdrs, &a)))
 287     {
 288       stat = RPC_CANTENCODEARGS;
 289       goto done_broad;
 290     }
 291   outlen = (int) xdr_getpos (xdrs);
 292   xdr_destroy (xdrs);
 293   /*
 294    * Basic loop: broadcast a packet and wait a while for response(s).
 295    * The response timeout grows larger per iteration.
 296    */
 297   for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2)
 298     {
 299       for (i = 0; i < nets; i++)
 300         {
 301           baddr.sin_addr = addrs[i];
 302           if (__sendto (sock, outbuf, outlen, 0,
 303                         (struct sockaddr *) &baddr,
 304                         sizeof (struct sockaddr)) != outlen)
 305             {
 306               perror (_("Cannot send broadcast packet"));
 307               stat = RPC_CANTSEND;
 308               goto done_broad;
 309             }
 310         }
 311       if (eachresult == NULL)
 312         {
 313           stat = RPC_SUCCESS;
 314           goto done_broad;
 315         }
 316     recv_again:
 317       msg.acpted_rply.ar_verf = _null_auth;
 318       msg.acpted_rply.ar_results.where = (caddr_t) & r;
 319       msg.acpted_rply.ar_results.proc = (xdrproc_t) INTUSE(xdr_rmtcallres);
 320       milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
 321       switch (__poll(&fd, 1, milliseconds))
 322         {
 323
 324         case 0:         /* timed out */
 325           stat = RPC_TIMEDOUT;
 326           continue;
 327
 328         case -1:                /* some kind of error */
 329           if (errno == EINTR)
 330             goto recv_again;
 331           perror (_("Broadcast poll problem"));
 332           stat = RPC_CANTRECV;
 333           goto done_broad;
 334
 335         }                       /* end of poll results switch */
 336     try_again:
 337       fromlen = sizeof (struct sockaddr);
 338       inlen = __recvfrom (sock, inbuf, UDPMSGSIZE, 0,
 339                           (struct sockaddr *) &raddr, &fromlen);
 340       if (inlen < 0)
 341         {
 342           if (errno == EINTR)
 343             goto try_again;
 344           perror (_("Cannot receive reply to broadcast"));
 345           stat = RPC_CANTRECV;
 346           goto done_broad;
 347         }
 348       if ((size_t) inlen < sizeof (u_long))
 349         goto recv_again;
 350       /*
 351        * see if reply transaction id matches sent id.
 352        * If so, decode the results.
 353        */
 354       INTUSE(xdrmem_create) (xdrs, inbuf, (u_int) inlen, XDR_DECODE);
 355       if (INTUSE(xdr_replymsg) (xdrs, &msg))
 356         {
 357           if (((u_int32_t) msg.rm_xid == (u_int32_t) xid) &&
 358               (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 359               (msg.acpted_rply.ar_stat == SUCCESS))
 360             {
 361               raddr.sin_port = htons ((u_short) port);
 362               done = (*eachresult) (resultsp, &raddr);
 363             }
 364           /* otherwise, we just ignore the errors ... */
 365         }
 366       else
 367         {
 368 #ifdef notdef
 369           /* some kind of deserialization problem ... */
 370           if ((u_int32_t) msg.rm_xid == (u_int32_t) xid)
 371             fprintf (stderr, "Broadcast deserialization problem");
 372           /* otherwise, just random garbage */
 373 #endif
 374         }
 375       xdrs->x_op = XDR_FREE;
 376       msg.acpted_rply.ar_results.proc = (xdrproc_t)INTUSE(xdr_void);
 377       (void) INTUSE(xdr_replymsg) (xdrs, &msg);
 378       (void) (*xresults) (xdrs, resultsp);
 379       xdr_destroy (xdrs);
 380       if (done)
 381         {
 382           stat = RPC_SUCCESS;
 383           goto done_broad;
 384         }
 385       else
 386         {
 387           goto recv_again;
 388         }
 389     }
 390 done_broad:
 391   (void) __close (sock);
 392   AUTH_DESTROY (unix_auth);
 393   return stat;
 394 }